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Commit | Line | Data |
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923a654c | 1 | #include <linux/bitmap.h> |
d2876d08 DB |
2 | #include <linux/kernel.h> |
3 | #include <linux/module.h> | |
ff77c352 | 4 | #include <linux/interrupt.h> |
d2876d08 DB |
5 | #include <linux/irq.h> |
6 | #include <linux/spinlock.h> | |
1a989d0f | 7 | #include <linux/list.h> |
d8f388d8 DB |
8 | #include <linux/device.h> |
9 | #include <linux/err.h> | |
10 | #include <linux/debugfs.h> | |
11 | #include <linux/seq_file.h> | |
12 | #include <linux/gpio.h> | |
391c970c | 13 | #include <linux/of_gpio.h> |
ff77c352 | 14 | #include <linux/idr.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
7b199811 | 16 | #include <linux/acpi.h> |
53e7cac3 | 17 | #include <linux/gpio/driver.h> |
0a6d3158 | 18 | #include <linux/gpio/machine.h> |
c771c2f4 | 19 | #include <linux/pinctrl/consumer.h> |
3c702e99 LW |
20 | #include <linux/cdev.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/uaccess.h> | |
8b92e17e | 23 | #include <linux/compat.h> |
d7c51b47 | 24 | #include <linux/anon_inodes.h> |
953b956a | 25 | #include <linux/file.h> |
61f922db LW |
26 | #include <linux/kfifo.h> |
27 | #include <linux/poll.h> | |
28 | #include <linux/timekeeping.h> | |
3c702e99 | 29 | #include <uapi/linux/gpio.h> |
d2876d08 | 30 | |
664e3e5a MW |
31 | #include "gpiolib.h" |
32 | ||
3f397c21 UKK |
33 | #define CREATE_TRACE_POINTS |
34 | #include <trace/events/gpio.h> | |
d2876d08 | 35 | |
79a9becd | 36 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 37 | * |
79a9becd AC |
38 | * The GPIO programming interface allows for inlining speed-critical |
39 | * get/set operations for common cases, so that access to SOC-integrated | |
40 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
41 | */ |
42 | ||
43 | ||
44 | /* When debugging, extend minimal trust to callers and platform code. | |
45 | * Also emit diagnostic messages that may help initial bringup, when | |
46 | * board setup or driver bugs are most common. | |
47 | * | |
48 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
49 | */ | |
50 | #ifdef DEBUG | |
51 | #define extra_checks 1 | |
52 | #else | |
53 | #define extra_checks 0 | |
54 | #endif | |
55 | ||
ff2b1359 LW |
56 | /* Device and char device-related information */ |
57 | static DEFINE_IDA(gpio_ida); | |
3c702e99 LW |
58 | static dev_t gpio_devt; |
59 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ | |
60 | static struct bus_type gpio_bus_type = { | |
61 | .name = "gpio", | |
62 | }; | |
ff2b1359 | 63 | |
d2876d08 DB |
64 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
65 | * While any GPIO is requested, its gpio_chip is not removable; | |
66 | * each GPIO's "requested" flag serves as a lock and refcount. | |
67 | */ | |
0eb4c6c2 | 68 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 69 | |
bae48da2 AC |
70 | static DEFINE_MUTEX(gpio_lookup_lock); |
71 | static LIST_HEAD(gpio_lookup_list); | |
ff2b1359 | 72 | LIST_HEAD(gpio_devices); |
6d86750c JH |
73 | |
74 | static void gpiochip_free_hogs(struct gpio_chip *chip); | |
e0d89728 | 75 | static int gpiochip_add_irqchip(struct gpio_chip *gpiochip); |
6d86750c | 76 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); |
79b804cb MW |
77 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip); |
78 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip); | |
6d86750c | 79 | |
159f3cd9 | 80 | static bool gpiolib_initialized; |
6d86750c | 81 | |
d2876d08 DB |
82 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
83 | { | |
d2876d08 | 84 | d->label = label; |
d2876d08 DB |
85 | } |
86 | ||
372e722e | 87 | /** |
950d55f5 TR |
88 | * gpio_to_desc - Convert a GPIO number to its descriptor |
89 | * @gpio: global GPIO number | |
90 | * | |
91 | * Returns: | |
92 | * The GPIO descriptor associated with the given GPIO, or %NULL if no GPIO | |
93 | * with the given number exists in the system. | |
372e722e | 94 | */ |
79a9becd | 95 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 96 | { |
ff2b1359 | 97 | struct gpio_device *gdev; |
14e85c0e AC |
98 | unsigned long flags; |
99 | ||
100 | spin_lock_irqsave(&gpio_lock, flags); | |
101 | ||
ff2b1359 | 102 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
103 | if (gdev->base <= gpio && |
104 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 105 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 106 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
107 | } |
108 | } | |
109 | ||
110 | spin_unlock_irqrestore(&gpio_lock, flags); | |
111 | ||
0e9a5edf AC |
112 | if (!gpio_is_valid(gpio)) |
113 | WARN(1, "invalid GPIO %d\n", gpio); | |
114 | ||
14e85c0e | 115 | return NULL; |
372e722e | 116 | } |
79a9becd | 117 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 118 | |
d468bf9e | 119 | /** |
950d55f5 TR |
120 | * gpiochip_get_desc - get the GPIO descriptor corresponding to the given |
121 | * hardware number for this chip | |
122 | * @chip: GPIO chip | |
123 | * @hwnum: hardware number of the GPIO for this chip | |
124 | * | |
125 | * Returns: | |
126 | * A pointer to the GPIO descriptor or %ERR_PTR(-EINVAL) if no GPIO exists | |
127 | * in the given chip for the specified hardware number. | |
d468bf9e | 128 | */ |
bb1e88cc AC |
129 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
130 | u16 hwnum) | |
d468bf9e | 131 | { |
fdeb8e15 LW |
132 | struct gpio_device *gdev = chip->gpiodev; |
133 | ||
134 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 135 | return ERR_PTR(-EINVAL); |
d468bf9e | 136 | |
fdeb8e15 | 137 | return &gdev->descs[hwnum]; |
d468bf9e | 138 | } |
372e722e AC |
139 | |
140 | /** | |
950d55f5 TR |
141 | * desc_to_gpio - convert a GPIO descriptor to the integer namespace |
142 | * @desc: GPIO descriptor | |
143 | * | |
372e722e | 144 | * This should disappear in the future but is needed since we still |
950d55f5 TR |
145 | * use GPIO numbers for error messages and sysfs nodes. |
146 | * | |
147 | * Returns: | |
148 | * The global GPIO number for the GPIO specified by its descriptor. | |
372e722e | 149 | */ |
79a9becd | 150 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 151 | { |
fdeb8e15 | 152 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 153 | } |
79a9becd | 154 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
155 | |
156 | ||
79a9becd AC |
157 | /** |
158 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
159 | * @desc: descriptor to return the chip of | |
160 | */ | |
161 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 162 | { |
fdeb8e15 LW |
163 | if (!desc || !desc->gdev || !desc->gdev->chip) |
164 | return NULL; | |
165 | return desc->gdev->chip; | |
372e722e | 166 | } |
79a9becd | 167 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 168 | |
8d0aab2f AV |
169 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
170 | static int gpiochip_find_base(int ngpio) | |
171 | { | |
ff2b1359 | 172 | struct gpio_device *gdev; |
83cabe33 | 173 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 174 | |
ff2b1359 | 175 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 176 | /* found a free space? */ |
fdeb8e15 | 177 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
178 | break; |
179 | else | |
180 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 181 | base = gdev->base - ngpio; |
8d0aab2f AV |
182 | } |
183 | ||
83cabe33 | 184 | if (gpio_is_valid(base)) { |
8d0aab2f | 185 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
186 | return base; |
187 | } else { | |
188 | pr_err("%s: cannot find free range\n", __func__); | |
189 | return -ENOSPC; | |
169b6a7a | 190 | } |
169b6a7a AV |
191 | } |
192 | ||
79a9becd AC |
193 | /** |
194 | * gpiod_get_direction - return the current direction of a GPIO | |
195 | * @desc: GPIO to get the direction of | |
196 | * | |
197 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
198 | * | |
199 | * This function may sleep if gpiod_cansleep() is true. | |
200 | */ | |
8e53b0f1 | 201 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
202 | { |
203 | struct gpio_chip *chip; | |
372e722e | 204 | unsigned offset; |
80b0a602 MN |
205 | int status = -EINVAL; |
206 | ||
372e722e AC |
207 | chip = gpiod_to_chip(desc); |
208 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
209 | |
210 | if (!chip->get_direction) | |
211 | return status; | |
212 | ||
372e722e | 213 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
214 | if (status > 0) { |
215 | /* GPIOF_DIR_IN, or other positive */ | |
216 | status = 1; | |
8e53b0f1 | 217 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
218 | } |
219 | if (status == 0) { | |
220 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 221 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
222 | } |
223 | return status; | |
224 | } | |
79a9becd | 225 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 226 | |
1a989d0f AC |
227 | /* |
228 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 229 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
230 | * |
231 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
232 | * space. | |
233 | */ | |
ff2b1359 | 234 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 235 | { |
a961f9b4 | 236 | struct gpio_device *prev, *next; |
1a989d0f | 237 | |
ff2b1359 | 238 | if (list_empty(&gpio_devices)) { |
a961f9b4 | 239 | /* initial entry in list */ |
ff2b1359 | 240 | list_add_tail(&gdev->list, &gpio_devices); |
e28ecca6 | 241 | return 0; |
1a989d0f AC |
242 | } |
243 | ||
a961f9b4 BJZ |
244 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
245 | if (gdev->base + gdev->ngpio <= next->base) { | |
246 | /* add before first entry */ | |
247 | list_add(&gdev->list, &gpio_devices); | |
248 | return 0; | |
1a989d0f AC |
249 | } |
250 | ||
a961f9b4 BJZ |
251 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
252 | if (prev->base + prev->ngpio <= gdev->base) { | |
253 | /* add behind last entry */ | |
254 | list_add_tail(&gdev->list, &gpio_devices); | |
96098df1 | 255 | return 0; |
1a989d0f AC |
256 | } |
257 | ||
a961f9b4 BJZ |
258 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
259 | /* at the end of the list */ | |
260 | if (&next->list == &gpio_devices) | |
261 | break; | |
1a989d0f | 262 | |
a961f9b4 BJZ |
263 | /* add between prev and next */ |
264 | if (prev->base + prev->ngpio <= gdev->base | |
265 | && gdev->base + gdev->ngpio <= next->base) { | |
266 | list_add(&gdev->list, &prev->list); | |
267 | return 0; | |
268 | } | |
269 | } | |
270 | ||
271 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); | |
272 | return -EBUSY; | |
1a989d0f AC |
273 | } |
274 | ||
950d55f5 | 275 | /* |
f881bab0 LW |
276 | * Convert a GPIO name to its descriptor |
277 | */ | |
278 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
279 | { | |
ff2b1359 | 280 | struct gpio_device *gdev; |
f881bab0 LW |
281 | unsigned long flags; |
282 | ||
283 | spin_lock_irqsave(&gpio_lock, flags); | |
284 | ||
ff2b1359 | 285 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
286 | int i; |
287 | ||
fdeb8e15 LW |
288 | for (i = 0; i != gdev->ngpio; ++i) { |
289 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 290 | |
fdeb8e15 | 291 | if (!desc->name || !name) |
f881bab0 LW |
292 | continue; |
293 | ||
fdeb8e15 | 294 | if (!strcmp(desc->name, name)) { |
f881bab0 | 295 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 296 | return desc; |
f881bab0 LW |
297 | } |
298 | } | |
299 | } | |
300 | ||
301 | spin_unlock_irqrestore(&gpio_lock, flags); | |
302 | ||
303 | return NULL; | |
304 | } | |
305 | ||
5f3ca732 MP |
306 | /* |
307 | * Takes the names from gc->names and checks if they are all unique. If they | |
308 | * are, they are assigned to their gpio descriptors. | |
309 | * | |
ed37915c | 310 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
311 | */ |
312 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
313 | { | |
fdeb8e15 | 314 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
315 | int i; |
316 | ||
317 | if (!gc->names) | |
318 | return 0; | |
319 | ||
320 | /* First check all names if they are unique */ | |
321 | for (i = 0; i != gc->ngpio; ++i) { | |
322 | struct gpio_desc *gpio; | |
323 | ||
324 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 325 | if (gpio) |
fdeb8e15 | 326 | dev_warn(&gdev->dev, |
34ffd85d | 327 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 328 | gc->names[i]); |
5f3ca732 MP |
329 | } |
330 | ||
331 | /* Then add all names to the GPIO descriptors */ | |
332 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 333 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
334 | |
335 | return 0; | |
336 | } | |
337 | ||
d7c51b47 LW |
338 | /* |
339 | * GPIO line handle management | |
340 | */ | |
341 | ||
342 | /** | |
343 | * struct linehandle_state - contains the state of a userspace handle | |
344 | * @gdev: the GPIO device the handle pertains to | |
345 | * @label: consumer label used to tag descriptors | |
346 | * @descs: the GPIO descriptors held by this handle | |
347 | * @numdescs: the number of descriptors held in the descs array | |
348 | */ | |
349 | struct linehandle_state { | |
350 | struct gpio_device *gdev; | |
351 | const char *label; | |
352 | struct gpio_desc *descs[GPIOHANDLES_MAX]; | |
353 | u32 numdescs; | |
354 | }; | |
355 | ||
e3e847c7 LPC |
356 | #define GPIOHANDLE_REQUEST_VALID_FLAGS \ |
357 | (GPIOHANDLE_REQUEST_INPUT | \ | |
358 | GPIOHANDLE_REQUEST_OUTPUT | \ | |
359 | GPIOHANDLE_REQUEST_ACTIVE_LOW | \ | |
360 | GPIOHANDLE_REQUEST_OPEN_DRAIN | \ | |
361 | GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
362 | ||
d7c51b47 LW |
363 | static long linehandle_ioctl(struct file *filep, unsigned int cmd, |
364 | unsigned long arg) | |
365 | { | |
366 | struct linehandle_state *lh = filep->private_data; | |
367 | void __user *ip = (void __user *)arg; | |
368 | struct gpiohandle_data ghd; | |
eec1d566 | 369 | int vals[GPIOHANDLES_MAX]; |
d7c51b47 LW |
370 | int i; |
371 | ||
372 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
eec1d566 LW |
373 | /* TODO: check if descriptors are really input */ |
374 | int ret = gpiod_get_array_value_complex(false, | |
375 | true, | |
376 | lh->numdescs, | |
377 | lh->descs, | |
378 | vals); | |
379 | if (ret) | |
380 | return ret; | |
d7c51b47 | 381 | |
3eded5d8 | 382 | memset(&ghd, 0, sizeof(ghd)); |
eec1d566 LW |
383 | for (i = 0; i < lh->numdescs; i++) |
384 | ghd.values[i] = vals[i]; | |
d7c51b47 LW |
385 | |
386 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
387 | return -EFAULT; | |
388 | ||
389 | return 0; | |
390 | } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) { | |
d7c51b47 LW |
391 | /* TODO: check if descriptors are really output */ |
392 | if (copy_from_user(&ghd, ip, sizeof(ghd))) | |
393 | return -EFAULT; | |
394 | ||
395 | /* Clamp all values to [0,1] */ | |
396 | for (i = 0; i < lh->numdescs; i++) | |
397 | vals[i] = !!ghd.values[i]; | |
398 | ||
399 | /* Reuse the array setting function */ | |
400 | gpiod_set_array_value_complex(false, | |
401 | true, | |
402 | lh->numdescs, | |
403 | lh->descs, | |
404 | vals); | |
405 | return 0; | |
406 | } | |
407 | return -EINVAL; | |
408 | } | |
409 | ||
410 | #ifdef CONFIG_COMPAT | |
411 | static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd, | |
412 | unsigned long arg) | |
413 | { | |
414 | return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
415 | } | |
416 | #endif | |
417 | ||
418 | static int linehandle_release(struct inode *inode, struct file *filep) | |
419 | { | |
420 | struct linehandle_state *lh = filep->private_data; | |
421 | struct gpio_device *gdev = lh->gdev; | |
422 | int i; | |
423 | ||
424 | for (i = 0; i < lh->numdescs; i++) | |
425 | gpiod_free(lh->descs[i]); | |
426 | kfree(lh->label); | |
427 | kfree(lh); | |
428 | put_device(&gdev->dev); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | static const struct file_operations linehandle_fileops = { | |
433 | .release = linehandle_release, | |
434 | .owner = THIS_MODULE, | |
435 | .llseek = noop_llseek, | |
436 | .unlocked_ioctl = linehandle_ioctl, | |
437 | #ifdef CONFIG_COMPAT | |
438 | .compat_ioctl = linehandle_ioctl_compat, | |
439 | #endif | |
440 | }; | |
441 | ||
442 | static int linehandle_create(struct gpio_device *gdev, void __user *ip) | |
443 | { | |
444 | struct gpiohandle_request handlereq; | |
445 | struct linehandle_state *lh; | |
953b956a | 446 | struct file *file; |
d7c51b47 | 447 | int fd, i, ret; |
418ee8e9 | 448 | u32 lflags; |
d7c51b47 LW |
449 | |
450 | if (copy_from_user(&handlereq, ip, sizeof(handlereq))) | |
451 | return -EFAULT; | |
452 | if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX)) | |
453 | return -EINVAL; | |
454 | ||
418ee8e9 BG |
455 | lflags = handlereq.flags; |
456 | ||
457 | /* Return an error if an unknown flag is set */ | |
458 | if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) | |
459 | return -EINVAL; | |
460 | ||
609aaf6a BG |
461 | /* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */ |
462 | if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) && | |
463 | ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) || | |
464 | (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))) | |
465 | return -EINVAL; | |
466 | ||
d7c51b47 LW |
467 | lh = kzalloc(sizeof(*lh), GFP_KERNEL); |
468 | if (!lh) | |
469 | return -ENOMEM; | |
470 | lh->gdev = gdev; | |
471 | get_device(&gdev->dev); | |
472 | ||
473 | /* Make sure this is terminated */ | |
474 | handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0'; | |
475 | if (strlen(handlereq.consumer_label)) { | |
476 | lh->label = kstrdup(handlereq.consumer_label, | |
477 | GFP_KERNEL); | |
478 | if (!lh->label) { | |
479 | ret = -ENOMEM; | |
480 | goto out_free_lh; | |
481 | } | |
482 | } | |
483 | ||
484 | /* Request each GPIO */ | |
485 | for (i = 0; i < handlereq.lines; i++) { | |
486 | u32 offset = handlereq.lineoffsets[i]; | |
d7c51b47 LW |
487 | struct gpio_desc *desc; |
488 | ||
e405f9fc LPC |
489 | if (offset >= gdev->ngpio) { |
490 | ret = -EINVAL; | |
491 | goto out_free_descs; | |
492 | } | |
493 | ||
d7c51b47 LW |
494 | desc = &gdev->descs[offset]; |
495 | ret = gpiod_request(desc, lh->label); | |
496 | if (ret) | |
497 | goto out_free_descs; | |
498 | lh->descs[i] = desc; | |
499 | ||
500 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
501 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
502 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
503 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
504 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
505 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
506 | ||
507 | /* | |
508 | * Lines have to be requested explicitly for input | |
509 | * or output, else the line will be treated "as is". | |
510 | */ | |
511 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
512 | int val = !!handlereq.default_values[i]; | |
513 | ||
514 | ret = gpiod_direction_output(desc, val); | |
515 | if (ret) | |
516 | goto out_free_descs; | |
517 | } else if (lflags & GPIOHANDLE_REQUEST_INPUT) { | |
518 | ret = gpiod_direction_input(desc); | |
519 | if (ret) | |
520 | goto out_free_descs; | |
521 | } | |
522 | dev_dbg(&gdev->dev, "registered chardev handle for line %d\n", | |
523 | offset); | |
524 | } | |
e2f608be LW |
525 | /* Let i point at the last handle */ |
526 | i--; | |
d7c51b47 LW |
527 | lh->numdescs = handlereq.lines; |
528 | ||
953b956a | 529 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
d7c51b47 LW |
530 | if (fd < 0) { |
531 | ret = fd; | |
532 | goto out_free_descs; | |
533 | } | |
534 | ||
953b956a LPC |
535 | file = anon_inode_getfile("gpio-linehandle", |
536 | &linehandle_fileops, | |
537 | lh, | |
538 | O_RDONLY | O_CLOEXEC); | |
539 | if (IS_ERR(file)) { | |
540 | ret = PTR_ERR(file); | |
541 | goto out_put_unused_fd; | |
542 | } | |
543 | ||
d7c51b47 | 544 | handlereq.fd = fd; |
d932cd49 | 545 | if (copy_to_user(ip, &handlereq, sizeof(handlereq))) { |
953b956a LPC |
546 | /* |
547 | * fput() will trigger the release() callback, so do not go onto | |
548 | * the regular error cleanup path here. | |
549 | */ | |
550 | fput(file); | |
551 | put_unused_fd(fd); | |
552 | return -EFAULT; | |
d932cd49 | 553 | } |
d7c51b47 | 554 | |
953b956a LPC |
555 | fd_install(fd, file); |
556 | ||
d7c51b47 LW |
557 | dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n", |
558 | lh->numdescs); | |
559 | ||
560 | return 0; | |
561 | ||
953b956a LPC |
562 | out_put_unused_fd: |
563 | put_unused_fd(fd); | |
d7c51b47 LW |
564 | out_free_descs: |
565 | for (; i >= 0; i--) | |
566 | gpiod_free(lh->descs[i]); | |
567 | kfree(lh->label); | |
568 | out_free_lh: | |
569 | kfree(lh); | |
570 | put_device(&gdev->dev); | |
571 | return ret; | |
572 | } | |
573 | ||
61f922db LW |
574 | /* |
575 | * GPIO line event management | |
576 | */ | |
577 | ||
578 | /** | |
579 | * struct lineevent_state - contains the state of a userspace event | |
580 | * @gdev: the GPIO device the event pertains to | |
581 | * @label: consumer label used to tag descriptors | |
582 | * @desc: the GPIO descriptor held by this event | |
583 | * @eflags: the event flags this line was requested with | |
584 | * @irq: the interrupt that trigger in response to events on this GPIO | |
585 | * @wait: wait queue that handles blocking reads of events | |
586 | * @events: KFIFO for the GPIO events | |
587 | * @read_lock: mutex lock to protect reads from colliding with adding | |
588 | * new events to the FIFO | |
589 | */ | |
590 | struct lineevent_state { | |
591 | struct gpio_device *gdev; | |
592 | const char *label; | |
593 | struct gpio_desc *desc; | |
594 | u32 eflags; | |
595 | int irq; | |
596 | wait_queue_head_t wait; | |
597 | DECLARE_KFIFO(events, struct gpioevent_data, 16); | |
598 | struct mutex read_lock; | |
599 | }; | |
600 | ||
ac7dbb99 LPC |
601 | #define GPIOEVENT_REQUEST_VALID_FLAGS \ |
602 | (GPIOEVENT_REQUEST_RISING_EDGE | \ | |
603 | GPIOEVENT_REQUEST_FALLING_EDGE) | |
604 | ||
61f922db LW |
605 | static unsigned int lineevent_poll(struct file *filep, |
606 | struct poll_table_struct *wait) | |
607 | { | |
608 | struct lineevent_state *le = filep->private_data; | |
609 | unsigned int events = 0; | |
610 | ||
611 | poll_wait(filep, &le->wait, wait); | |
612 | ||
613 | if (!kfifo_is_empty(&le->events)) | |
614 | events = POLLIN | POLLRDNORM; | |
615 | ||
616 | return events; | |
617 | } | |
618 | ||
619 | ||
620 | static ssize_t lineevent_read(struct file *filep, | |
621 | char __user *buf, | |
622 | size_t count, | |
623 | loff_t *f_ps) | |
624 | { | |
625 | struct lineevent_state *le = filep->private_data; | |
626 | unsigned int copied; | |
627 | int ret; | |
628 | ||
629 | if (count < sizeof(struct gpioevent_data)) | |
630 | return -EINVAL; | |
631 | ||
632 | do { | |
633 | if (kfifo_is_empty(&le->events)) { | |
634 | if (filep->f_flags & O_NONBLOCK) | |
635 | return -EAGAIN; | |
636 | ||
637 | ret = wait_event_interruptible(le->wait, | |
638 | !kfifo_is_empty(&le->events)); | |
639 | if (ret) | |
640 | return ret; | |
641 | } | |
642 | ||
643 | if (mutex_lock_interruptible(&le->read_lock)) | |
644 | return -ERESTARTSYS; | |
645 | ret = kfifo_to_user(&le->events, buf, count, &copied); | |
646 | mutex_unlock(&le->read_lock); | |
647 | ||
648 | if (ret) | |
649 | return ret; | |
650 | ||
651 | /* | |
652 | * If we couldn't read anything from the fifo (a different | |
653 | * thread might have been faster) we either return -EAGAIN if | |
654 | * the file descriptor is non-blocking, otherwise we go back to | |
655 | * sleep and wait for more data to arrive. | |
656 | */ | |
657 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) | |
658 | return -EAGAIN; | |
659 | ||
660 | } while (copied == 0); | |
661 | ||
662 | return copied; | |
663 | } | |
664 | ||
665 | static int lineevent_release(struct inode *inode, struct file *filep) | |
666 | { | |
667 | struct lineevent_state *le = filep->private_data; | |
668 | struct gpio_device *gdev = le->gdev; | |
669 | ||
670 | free_irq(le->irq, le); | |
671 | gpiod_free(le->desc); | |
672 | kfree(le->label); | |
673 | kfree(le); | |
674 | put_device(&gdev->dev); | |
675 | return 0; | |
676 | } | |
677 | ||
678 | static long lineevent_ioctl(struct file *filep, unsigned int cmd, | |
679 | unsigned long arg) | |
680 | { | |
681 | struct lineevent_state *le = filep->private_data; | |
682 | void __user *ip = (void __user *)arg; | |
683 | struct gpiohandle_data ghd; | |
684 | ||
685 | /* | |
686 | * We can get the value for an event line but not set it, | |
687 | * because it is input by definition. | |
688 | */ | |
689 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
690 | int val; | |
691 | ||
d82aa4a8 LPC |
692 | memset(&ghd, 0, sizeof(ghd)); |
693 | ||
61f922db LW |
694 | val = gpiod_get_value_cansleep(le->desc); |
695 | if (val < 0) | |
696 | return val; | |
697 | ghd.values[0] = val; | |
698 | ||
699 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
700 | return -EFAULT; | |
701 | ||
702 | return 0; | |
703 | } | |
704 | return -EINVAL; | |
705 | } | |
706 | ||
707 | #ifdef CONFIG_COMPAT | |
708 | static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd, | |
709 | unsigned long arg) | |
710 | { | |
711 | return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
712 | } | |
713 | #endif | |
714 | ||
715 | static const struct file_operations lineevent_fileops = { | |
716 | .release = lineevent_release, | |
717 | .read = lineevent_read, | |
718 | .poll = lineevent_poll, | |
719 | .owner = THIS_MODULE, | |
720 | .llseek = noop_llseek, | |
721 | .unlocked_ioctl = lineevent_ioctl, | |
722 | #ifdef CONFIG_COMPAT | |
723 | .compat_ioctl = lineevent_ioctl_compat, | |
724 | #endif | |
725 | }; | |
726 | ||
33265b17 | 727 | static irqreturn_t lineevent_irq_thread(int irq, void *p) |
61f922db LW |
728 | { |
729 | struct lineevent_state *le = p; | |
730 | struct gpioevent_data ge; | |
df1e76f2 | 731 | int ret, level; |
61f922db LW |
732 | |
733 | ge.timestamp = ktime_get_real_ns(); | |
df1e76f2 | 734 | level = gpiod_get_value_cansleep(le->desc); |
61f922db | 735 | |
ad537b82 BG |
736 | if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE |
737 | && le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { | |
61f922db LW |
738 | if (level) |
739 | /* Emit low-to-high event */ | |
740 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
741 | else | |
742 | /* Emit high-to-low event */ | |
743 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
df1e76f2 | 744 | } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE && level) { |
61f922db LW |
745 | /* Emit low-to-high event */ |
746 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
df1e76f2 | 747 | } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE && !level) { |
61f922db LW |
748 | /* Emit high-to-low event */ |
749 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
bc0207a5 AB |
750 | } else { |
751 | return IRQ_NONE; | |
61f922db LW |
752 | } |
753 | ||
754 | ret = kfifo_put(&le->events, ge); | |
755 | if (ret != 0) | |
756 | wake_up_poll(&le->wait, POLLIN); | |
757 | ||
758 | return IRQ_HANDLED; | |
759 | } | |
760 | ||
761 | static int lineevent_create(struct gpio_device *gdev, void __user *ip) | |
762 | { | |
763 | struct gpioevent_request eventreq; | |
764 | struct lineevent_state *le; | |
765 | struct gpio_desc *desc; | |
953b956a | 766 | struct file *file; |
61f922db LW |
767 | u32 offset; |
768 | u32 lflags; | |
769 | u32 eflags; | |
770 | int fd; | |
771 | int ret; | |
772 | int irqflags = 0; | |
773 | ||
774 | if (copy_from_user(&eventreq, ip, sizeof(eventreq))) | |
775 | return -EFAULT; | |
776 | ||
777 | le = kzalloc(sizeof(*le), GFP_KERNEL); | |
778 | if (!le) | |
779 | return -ENOMEM; | |
780 | le->gdev = gdev; | |
781 | get_device(&gdev->dev); | |
782 | ||
783 | /* Make sure this is terminated */ | |
784 | eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0'; | |
785 | if (strlen(eventreq.consumer_label)) { | |
786 | le->label = kstrdup(eventreq.consumer_label, | |
787 | GFP_KERNEL); | |
788 | if (!le->label) { | |
789 | ret = -ENOMEM; | |
790 | goto out_free_le; | |
791 | } | |
792 | } | |
793 | ||
794 | offset = eventreq.lineoffset; | |
795 | lflags = eventreq.handleflags; | |
796 | eflags = eventreq.eventflags; | |
797 | ||
b8b0e3d3 LPC |
798 | if (offset >= gdev->ngpio) { |
799 | ret = -EINVAL; | |
800 | goto out_free_label; | |
801 | } | |
802 | ||
ac7dbb99 LPC |
803 | /* Return an error if a unknown flag is set */ |
804 | if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) || | |
805 | (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) { | |
806 | ret = -EINVAL; | |
807 | goto out_free_label; | |
808 | } | |
809 | ||
61f922db LW |
810 | /* This is just wrong: we don't look for events on output lines */ |
811 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
812 | ret = -EINVAL; | |
813 | goto out_free_label; | |
814 | } | |
815 | ||
816 | desc = &gdev->descs[offset]; | |
817 | ret = gpiod_request(desc, le->label); | |
818 | if (ret) | |
819 | goto out_free_desc; | |
820 | le->desc = desc; | |
821 | le->eflags = eflags; | |
822 | ||
823 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
824 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
825 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
826 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
827 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
828 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
829 | ||
830 | ret = gpiod_direction_input(desc); | |
831 | if (ret) | |
832 | goto out_free_desc; | |
833 | ||
834 | le->irq = gpiod_to_irq(desc); | |
835 | if (le->irq <= 0) { | |
836 | ret = -ENODEV; | |
837 | goto out_free_desc; | |
838 | } | |
839 | ||
840 | if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) | |
841 | irqflags |= IRQF_TRIGGER_RISING; | |
842 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) | |
843 | irqflags |= IRQF_TRIGGER_FALLING; | |
844 | irqflags |= IRQF_ONESHOT; | |
845 | irqflags |= IRQF_SHARED; | |
846 | ||
847 | INIT_KFIFO(le->events); | |
848 | init_waitqueue_head(&le->wait); | |
849 | mutex_init(&le->read_lock); | |
850 | ||
851 | /* Request a thread to read the events */ | |
852 | ret = request_threaded_irq(le->irq, | |
853 | NULL, | |
854 | lineevent_irq_thread, | |
855 | irqflags, | |
856 | le->label, | |
857 | le); | |
858 | if (ret) | |
859 | goto out_free_desc; | |
860 | ||
953b956a | 861 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
61f922db LW |
862 | if (fd < 0) { |
863 | ret = fd; | |
864 | goto out_free_irq; | |
865 | } | |
866 | ||
953b956a LPC |
867 | file = anon_inode_getfile("gpio-event", |
868 | &lineevent_fileops, | |
869 | le, | |
870 | O_RDONLY | O_CLOEXEC); | |
871 | if (IS_ERR(file)) { | |
872 | ret = PTR_ERR(file); | |
873 | goto out_put_unused_fd; | |
874 | } | |
875 | ||
61f922db | 876 | eventreq.fd = fd; |
d932cd49 | 877 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
953b956a LPC |
878 | /* |
879 | * fput() will trigger the release() callback, so do not go onto | |
880 | * the regular error cleanup path here. | |
881 | */ | |
882 | fput(file); | |
883 | put_unused_fd(fd); | |
884 | return -EFAULT; | |
d932cd49 | 885 | } |
61f922db | 886 | |
953b956a LPC |
887 | fd_install(fd, file); |
888 | ||
61f922db LW |
889 | return 0; |
890 | ||
953b956a LPC |
891 | out_put_unused_fd: |
892 | put_unused_fd(fd); | |
61f922db LW |
893 | out_free_irq: |
894 | free_irq(le->irq, le); | |
895 | out_free_desc: | |
896 | gpiod_free(le->desc); | |
897 | out_free_label: | |
898 | kfree(le->label); | |
899 | out_free_le: | |
900 | kfree(le); | |
901 | put_device(&gdev->dev); | |
902 | return ret; | |
903 | } | |
904 | ||
950d55f5 | 905 | /* |
3c702e99 LW |
906 | * gpio_ioctl() - ioctl handler for the GPIO chardev |
907 | */ | |
908 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
909 | { | |
910 | struct gpio_device *gdev = filp->private_data; | |
911 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 912 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
913 | |
914 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
915 | if (!chip) | |
916 | return -ENODEV; | |
917 | ||
521a2ad6 | 918 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 919 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
920 | struct gpiochip_info chipinfo; |
921 | ||
0f4bbb23 LPC |
922 | memset(&chipinfo, 0, sizeof(chipinfo)); |
923 | ||
3c702e99 LW |
924 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
925 | sizeof(chipinfo.name)); | |
926 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
927 | strncpy(chipinfo.label, gdev->label, |
928 | sizeof(chipinfo.label)); | |
929 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 930 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
931 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
932 | return -EFAULT; | |
933 | return 0; | |
521a2ad6 LW |
934 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
935 | struct gpioline_info lineinfo; | |
936 | struct gpio_desc *desc; | |
937 | ||
938 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
939 | return -EFAULT; | |
1f1cc456 | 940 | if (lineinfo.line_offset >= gdev->ngpio) |
521a2ad6 LW |
941 | return -EINVAL; |
942 | ||
943 | desc = &gdev->descs[lineinfo.line_offset]; | |
944 | if (desc->name) { | |
945 | strncpy(lineinfo.name, desc->name, | |
946 | sizeof(lineinfo.name)); | |
947 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
948 | } else { | |
949 | lineinfo.name[0] = '\0'; | |
950 | } | |
951 | if (desc->label) { | |
214338e3 LW |
952 | strncpy(lineinfo.consumer, desc->label, |
953 | sizeof(lineinfo.consumer)); | |
954 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 955 | } else { |
214338e3 | 956 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
957 | } |
958 | ||
959 | /* | |
960 | * Userspace only need to know that the kernel is using | |
961 | * this GPIO so it can't use it. | |
962 | */ | |
963 | lineinfo.flags = 0; | |
9d8cc89c LW |
964 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
965 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
966 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
967 | test_bit(FLAG_EXPORT, &desc->flags) || | |
968 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 969 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 970 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 971 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 972 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 973 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 974 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 975 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 976 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
977 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
978 | ||
979 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
980 | return -EFAULT; | |
981 | return 0; | |
d7c51b47 LW |
982 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
983 | return linehandle_create(gdev, ip); | |
61f922db LW |
984 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
985 | return lineevent_create(gdev, ip); | |
3c702e99 LW |
986 | } |
987 | return -EINVAL; | |
988 | } | |
989 | ||
8b92e17e LW |
990 | #ifdef CONFIG_COMPAT |
991 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
992 | unsigned long arg) | |
993 | { | |
994 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
995 | } | |
996 | #endif | |
997 | ||
3c702e99 LW |
998 | /** |
999 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
1000 | * @inode: inode for this chardev | |
1001 | * @filp: file struct for storing private data | |
1002 | * Returns 0 on success | |
1003 | */ | |
1004 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
1005 | { | |
1006 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1007 | struct gpio_device, chrdev); | |
1008 | ||
1009 | /* Fail on open if the backing gpiochip is gone */ | |
fb505747 | 1010 | if (!gdev->chip) |
3c702e99 LW |
1011 | return -ENODEV; |
1012 | get_device(&gdev->dev); | |
1013 | filp->private_data = gdev; | |
f4e81c52 LPC |
1014 | |
1015 | return nonseekable_open(inode, filp); | |
3c702e99 LW |
1016 | } |
1017 | ||
1018 | /** | |
1019 | * gpio_chrdev_release() - close chardev after ioctl operations | |
1020 | * @inode: inode for this chardev | |
1021 | * @filp: file struct for storing private data | |
1022 | * Returns 0 on success | |
1023 | */ | |
1024 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
1025 | { | |
1026 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1027 | struct gpio_device, chrdev); | |
1028 | ||
3c702e99 LW |
1029 | put_device(&gdev->dev); |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | ||
1034 | static const struct file_operations gpio_fileops = { | |
1035 | .release = gpio_chrdev_release, | |
1036 | .open = gpio_chrdev_open, | |
1037 | .owner = THIS_MODULE, | |
f4e81c52 | 1038 | .llseek = no_llseek, |
3c702e99 | 1039 | .unlocked_ioctl = gpio_ioctl, |
8b92e17e LW |
1040 | #ifdef CONFIG_COMPAT |
1041 | .compat_ioctl = gpio_ioctl_compat, | |
1042 | #endif | |
3c702e99 LW |
1043 | }; |
1044 | ||
ff2b1359 LW |
1045 | static void gpiodevice_release(struct device *dev) |
1046 | { | |
1047 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
1048 | ||
1049 | list_del(&gdev->list); | |
1050 | ida_simple_remove(&gpio_ida, gdev->id); | |
476e2fc5 GR |
1051 | kfree(gdev->label); |
1052 | kfree(gdev->descs); | |
9efd9e69 | 1053 | kfree(gdev); |
ff2b1359 LW |
1054 | } |
1055 | ||
159f3cd9 GR |
1056 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
1057 | { | |
1058 | int status; | |
1059 | ||
1060 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
1061 | gdev->chrdev.owner = THIS_MODULE; | |
159f3cd9 | 1062 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); |
111379dc LG |
1063 | |
1064 | status = cdev_device_add(&gdev->chrdev, &gdev->dev); | |
159f3cd9 | 1065 | if (status) |
111379dc LG |
1066 | return status; |
1067 | ||
1068 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
1069 | MAJOR(gpio_devt), gdev->id); | |
159f3cd9 GR |
1070 | |
1071 | status = gpiochip_sysfs_register(gdev); | |
1072 | if (status) | |
1073 | goto err_remove_device; | |
1074 | ||
1075 | /* From this point, the .release() function cleans up gpio_device */ | |
1076 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
1077 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
1078 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
1079 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
1080 | ||
1081 | return 0; | |
1082 | ||
1083 | err_remove_device: | |
111379dc | 1084 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
159f3cd9 GR |
1085 | return status; |
1086 | } | |
1087 | ||
1088 | static void gpiochip_setup_devs(void) | |
1089 | { | |
1090 | struct gpio_device *gdev; | |
1091 | int err; | |
1092 | ||
1093 | list_for_each_entry(gdev, &gpio_devices, list) { | |
1094 | err = gpiochip_setup_dev(gdev); | |
1095 | if (err) | |
1096 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
1097 | dev_name(&gdev->dev), err); | |
1098 | } | |
1099 | } | |
1100 | ||
d2876d08 | 1101 | /** |
b08ea35a | 1102 | * gpiochip_add_data() - register a gpio_chip |
d2876d08 | 1103 | * @chip: the chip to register, with chip->base initialized |
950d55f5 | 1104 | * @data: driver-private data associated with this chip |
d2876d08 | 1105 | * |
950d55f5 | 1106 | * Context: potentially before irqs will work |
8d0aab2f | 1107 | * |
b08ea35a | 1108 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
c88402c2 | 1109 | * can be freely used, the chip->parent device must be registered before |
d8f388d8 DB |
1110 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
1111 | * for GPIOs will fail rudely. | |
1112 | * | |
159f3cd9 GR |
1113 | * gpiochip_add_data() must only be called after gpiolib initialization, |
1114 | * ie after core_initcall(). | |
1115 | * | |
8d0aab2f AV |
1116 | * If chip->base is negative, this requests dynamic assignment of |
1117 | * a range of valid GPIOs. | |
950d55f5 TR |
1118 | * |
1119 | * Returns: | |
1120 | * A negative errno if the chip can't be registered, such as because the | |
1121 | * chip->base is invalid or already associated with a different chip. | |
1122 | * Otherwise it returns zero as a success code. | |
d2876d08 | 1123 | */ |
b08ea35a | 1124 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
d2876d08 DB |
1125 | { |
1126 | unsigned long flags; | |
1127 | int status = 0; | |
ff2b1359 | 1128 | unsigned i; |
8d0aab2f | 1129 | int base = chip->base; |
ff2b1359 | 1130 | struct gpio_device *gdev; |
d2876d08 | 1131 | |
ff2b1359 LW |
1132 | /* |
1133 | * First: allocate and populate the internal stat container, and | |
1134 | * set up the struct device. | |
1135 | */ | |
969f07b4 | 1136 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 1137 | if (!gdev) |
14e85c0e | 1138 | return -ENOMEM; |
3c702e99 | 1139 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
1140 | gdev->chip = chip; |
1141 | chip->gpiodev = gdev; | |
1142 | if (chip->parent) { | |
1143 | gdev->dev.parent = chip->parent; | |
1144 | gdev->dev.of_node = chip->parent->of_node; | |
acc6e331 TR |
1145 | } |
1146 | ||
ff2b1359 LW |
1147 | #ifdef CONFIG_OF_GPIO |
1148 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
acc6e331 TR |
1149 | if (chip->of_node) |
1150 | gdev->dev.of_node = chip->of_node; | |
ff2b1359 | 1151 | #endif |
acc6e331 | 1152 | |
ff2b1359 LW |
1153 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
1154 | if (gdev->id < 0) { | |
1155 | status = gdev->id; | |
1156 | goto err_free_gdev; | |
1157 | } | |
1158 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
1159 | device_initialize(&gdev->dev); | |
1160 | dev_set_drvdata(&gdev->dev, gdev); | |
1161 | if (chip->parent && chip->parent->driver) | |
1162 | gdev->owner = chip->parent->driver->owner; | |
1163 | else if (chip->owner) | |
1164 | /* TODO: remove chip->owner */ | |
1165 | gdev->owner = chip->owner; | |
1166 | else | |
1167 | gdev->owner = THIS_MODULE; | |
d2876d08 | 1168 | |
476e2fc5 | 1169 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 1170 | if (!gdev->descs) { |
ff2b1359 LW |
1171 | status = -ENOMEM; |
1172 | goto err_free_gdev; | |
1173 | } | |
1174 | ||
5ed41cc4 BJZ |
1175 | if (chip->ngpio == 0) { |
1176 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 1177 | status = -EINVAL; |
159f3cd9 | 1178 | goto err_free_descs; |
5ed41cc4 | 1179 | } |
df4878e9 LW |
1180 | |
1181 | if (chip->label) | |
476e2fc5 | 1182 | gdev->label = kstrdup(chip->label, GFP_KERNEL); |
df4878e9 | 1183 | else |
476e2fc5 | 1184 | gdev->label = kstrdup("unknown", GFP_KERNEL); |
df4878e9 LW |
1185 | if (!gdev->label) { |
1186 | status = -ENOMEM; | |
476e2fc5 | 1187 | goto err_free_descs; |
df4878e9 LW |
1188 | } |
1189 | ||
fdeb8e15 | 1190 | gdev->ngpio = chip->ngpio; |
43c54eca | 1191 | gdev->data = data; |
5ed41cc4 | 1192 | |
d2876d08 DB |
1193 | spin_lock_irqsave(&gpio_lock, flags); |
1194 | ||
fdeb8e15 LW |
1195 | /* |
1196 | * TODO: this allocates a Linux GPIO number base in the global | |
1197 | * GPIO numberspace for this chip. In the long run we want to | |
1198 | * get *rid* of this numberspace and use only descriptors, but | |
1199 | * it may be a pipe dream. It will not happen before we get rid | |
1200 | * of the sysfs interface anyways. | |
1201 | */ | |
8d0aab2f AV |
1202 | if (base < 0) { |
1203 | base = gpiochip_find_base(chip->ngpio); | |
1204 | if (base < 0) { | |
1205 | status = base; | |
225fce83 | 1206 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1207 | goto err_free_label; |
8d0aab2f | 1208 | } |
fdeb8e15 LW |
1209 | /* |
1210 | * TODO: it should not be necessary to reflect the assigned | |
1211 | * base outside of the GPIO subsystem. Go over drivers and | |
1212 | * see if anyone makes use of this, else drop this and assign | |
1213 | * a poison instead. | |
1214 | */ | |
8d0aab2f AV |
1215 | chip->base = base; |
1216 | } | |
fdeb8e15 | 1217 | gdev->base = base; |
8d0aab2f | 1218 | |
ff2b1359 | 1219 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
1220 | if (status) { |
1221 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 1222 | goto err_free_label; |
05aa5203 | 1223 | } |
1a989d0f | 1224 | |
545ebd9a LW |
1225 | spin_unlock_irqrestore(&gpio_lock, flags); |
1226 | ||
ff2b1359 | 1227 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 1228 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 1229 | |
fdeb8e15 | 1230 | desc->gdev = gdev; |
72d32000 LW |
1231 | /* |
1232 | * REVISIT: most hardware initializes GPIOs as inputs | |
1233 | * (often with pullups enabled) so power usage is | |
1234 | * minimized. Linux code should set the gpio direction | |
1235 | * first thing; but until it does, and in case | |
1236 | * chip->get_direction is not set, we may expose the | |
1237 | * wrong direction in sysfs. | |
05aa5203 | 1238 | */ |
72d32000 LW |
1239 | |
1240 | if (chip->get_direction) { | |
1241 | /* | |
1242 | * If we have .get_direction, set up the initial | |
1243 | * direction flag from the hardware. | |
1244 | */ | |
1245 | int dir = chip->get_direction(chip, i); | |
1246 | ||
1247 | if (!dir) | |
1248 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1249 | } else if (!chip->direction_input) { | |
1250 | /* | |
1251 | * If the chip lacks the .direction_input callback | |
1252 | * we logically assume all lines are outputs. | |
1253 | */ | |
1254 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1255 | } | |
d2876d08 | 1256 | } |
14e85c0e | 1257 | |
f23f1516 | 1258 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 1259 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
1260 | #endif |
1261 | ||
5f3ca732 MP |
1262 | status = gpiochip_set_desc_names(chip); |
1263 | if (status) | |
1264 | goto err_remove_from_list; | |
1265 | ||
79b804cb MW |
1266 | status = gpiochip_irqchip_init_valid_mask(chip); |
1267 | if (status) | |
1268 | goto err_remove_from_list; | |
1269 | ||
e0d89728 TR |
1270 | status = gpiochip_add_irqchip(chip); |
1271 | if (status) | |
1272 | goto err_remove_chip; | |
1273 | ||
28355f81 TV |
1274 | status = of_gpiochip_add(chip); |
1275 | if (status) | |
1276 | goto err_remove_chip; | |
1277 | ||
664e3e5a | 1278 | acpi_gpiochip_add(chip); |
391c970c | 1279 | |
3c702e99 LW |
1280 | /* |
1281 | * By first adding the chardev, and then adding the device, | |
1282 | * we get a device node entry in sysfs under | |
1283 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
1284 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
1285 | * We can do this only if gpiolib has been initialized. |
1286 | * Otherwise, defer until later. | |
3c702e99 | 1287 | */ |
159f3cd9 GR |
1288 | if (gpiolib_initialized) { |
1289 | status = gpiochip_setup_dev(gdev); | |
1290 | if (status) | |
1291 | goto err_remove_chip; | |
1292 | } | |
cedb1881 | 1293 | return 0; |
3bae4811 | 1294 | |
225fce83 JH |
1295 | err_remove_chip: |
1296 | acpi_gpiochip_remove(chip); | |
6d86750c | 1297 | gpiochip_free_hogs(chip); |
225fce83 | 1298 | of_gpiochip_remove(chip); |
79b804cb | 1299 | gpiochip_irqchip_free_valid_mask(chip); |
5f3ca732 | 1300 | err_remove_from_list: |
225fce83 | 1301 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 1302 | list_del(&gdev->list); |
3bae4811 | 1303 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 GR |
1304 | err_free_label: |
1305 | kfree(gdev->label); | |
1306 | err_free_descs: | |
1307 | kfree(gdev->descs); | |
ff2b1359 LW |
1308 | err_free_gdev: |
1309 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 1310 | /* failures here can mean systems won't boot... */ |
7589e59f | 1311 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
fdeb8e15 LW |
1312 | gdev->base, gdev->base + gdev->ngpio - 1, |
1313 | chip->label ? : "generic"); | |
1314 | kfree(gdev); | |
d2876d08 DB |
1315 | return status; |
1316 | } | |
b08ea35a | 1317 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
d2876d08 | 1318 | |
43c54eca LW |
1319 | /** |
1320 | * gpiochip_get_data() - get per-subdriver data for the chip | |
950d55f5 TR |
1321 | * @chip: GPIO chip |
1322 | * | |
1323 | * Returns: | |
1324 | * The per-subdriver data for the chip. | |
43c54eca LW |
1325 | */ |
1326 | void *gpiochip_get_data(struct gpio_chip *chip) | |
1327 | { | |
1328 | return chip->gpiodev->data; | |
1329 | } | |
1330 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
1331 | ||
d2876d08 DB |
1332 | /** |
1333 | * gpiochip_remove() - unregister a gpio_chip | |
1334 | * @chip: the chip to unregister | |
1335 | * | |
1336 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1337 | */ | |
e1db1706 | 1338 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 1339 | { |
ff2b1359 | 1340 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 1341 | struct gpio_desc *desc; |
d2876d08 | 1342 | unsigned long flags; |
1c3cdb18 | 1343 | unsigned i; |
fab28b89 | 1344 | bool requested = false; |
d2876d08 | 1345 | |
ff2b1359 | 1346 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 1347 | gpiochip_sysfs_unregister(gdev); |
5018ada6 | 1348 | gpiochip_free_hogs(chip); |
bd203bd5 BJZ |
1349 | /* Numb the device, cancelling all outstanding operations */ |
1350 | gdev->chip = NULL; | |
00acc3dc | 1351 | gpiochip_irqchip_remove(chip); |
6072b9dc | 1352 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 1353 | gpiochip_remove_pin_ranges(chip); |
391c970c | 1354 | of_gpiochip_remove(chip); |
43c54eca LW |
1355 | /* |
1356 | * We accept no more calls into the driver from this point, so | |
1357 | * NULL the driver data pointer | |
1358 | */ | |
1359 | gdev->data = NULL; | |
391c970c | 1360 | |
6798acaa | 1361 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 1362 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 1363 | desc = &gdev->descs[i]; |
fab28b89 JH |
1364 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
1365 | requested = true; | |
d2876d08 | 1366 | } |
d2876d08 | 1367 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 1368 | |
fab28b89 | 1369 | if (requested) |
fdeb8e15 | 1370 | dev_crit(&gdev->dev, |
58383c78 | 1371 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 1372 | |
ff2b1359 LW |
1373 | /* |
1374 | * The gpiochip side puts its use of the device to rest here: | |
1375 | * if there are no userspace clients, the chardev and device will | |
1376 | * be removed, else it will be dangling until the last user is | |
1377 | * gone. | |
1378 | */ | |
111379dc | 1379 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
ff2b1359 | 1380 | put_device(&gdev->dev); |
d2876d08 DB |
1381 | } |
1382 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1383 | ||
0cf3292c LD |
1384 | static void devm_gpio_chip_release(struct device *dev, void *res) |
1385 | { | |
1386 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
1387 | ||
1388 | gpiochip_remove(chip); | |
1389 | } | |
1390 | ||
1391 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) | |
1392 | ||
1393 | { | |
1394 | struct gpio_chip **r = res; | |
1395 | ||
1396 | if (!r || !*r) { | |
1397 | WARN_ON(!r || !*r); | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | return *r == data; | |
1402 | } | |
1403 | ||
1404 | /** | |
1405 | * devm_gpiochip_add_data() - Resource manager piochip_add_data() | |
1406 | * @dev: the device pointer on which irq_chip belongs to. | |
1407 | * @chip: the chip to register, with chip->base initialized | |
950d55f5 | 1408 | * @data: driver-private data associated with this chip |
0cf3292c | 1409 | * |
950d55f5 | 1410 | * Context: potentially before irqs will work |
0cf3292c LD |
1411 | * |
1412 | * The gpio chip automatically be released when the device is unbound. | |
950d55f5 TR |
1413 | * |
1414 | * Returns: | |
1415 | * A negative errno if the chip can't be registered, such as because the | |
1416 | * chip->base is invalid or already associated with a different chip. | |
1417 | * Otherwise it returns zero as a success code. | |
0cf3292c LD |
1418 | */ |
1419 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
1420 | void *data) | |
1421 | { | |
1422 | struct gpio_chip **ptr; | |
1423 | int ret; | |
1424 | ||
1425 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
1426 | GFP_KERNEL); | |
1427 | if (!ptr) | |
1428 | return -ENOMEM; | |
1429 | ||
1430 | ret = gpiochip_add_data(chip, data); | |
1431 | if (ret < 0) { | |
1432 | devres_free(ptr); | |
1433 | return ret; | |
1434 | } | |
1435 | ||
1436 | *ptr = chip; | |
1437 | devres_add(dev, ptr); | |
1438 | ||
1439 | return 0; | |
1440 | } | |
1441 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
1442 | ||
1443 | /** | |
1444 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() | |
1445 | * @dev: device for which which resource was allocated | |
1446 | * @chip: the chip to remove | |
1447 | * | |
1448 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1449 | */ | |
1450 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) | |
1451 | { | |
1452 | int ret; | |
1453 | ||
1454 | ret = devres_release(dev, devm_gpio_chip_release, | |
1455 | devm_gpio_chip_match, chip); | |
3988d663 | 1456 | WARN_ON(ret); |
0cf3292c LD |
1457 | } |
1458 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); | |
1459 | ||
594fa265 GL |
1460 | /** |
1461 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1462 | * @data: data to pass to match function | |
950d55f5 | 1463 | * @match: Callback function to check gpio_chip |
594fa265 GL |
1464 | * |
1465 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1466 | * determined by a user supplied @match callback. The callback should return | |
1467 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1468 | * non-zero, this function will return to the caller and not iterate over any | |
1469 | * more gpio_chips. | |
1470 | */ | |
07ce8ec7 | 1471 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1472 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1473 | void *data)) |
594fa265 | 1474 | { |
ff2b1359 | 1475 | struct gpio_device *gdev; |
acf06ff7 | 1476 | struct gpio_chip *chip = NULL; |
594fa265 | 1477 | unsigned long flags; |
594fa265 GL |
1478 | |
1479 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 1480 | list_for_each_entry(gdev, &gpio_devices, list) |
acf06ff7 MY |
1481 | if (gdev->chip && match(gdev->chip, data)) { |
1482 | chip = gdev->chip; | |
594fa265 | 1483 | break; |
acf06ff7 | 1484 | } |
ff2b1359 | 1485 | |
594fa265 GL |
1486 | spin_unlock_irqrestore(&gpio_lock, flags); |
1487 | ||
1488 | return chip; | |
1489 | } | |
8fa0c9bf | 1490 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1491 | |
79697ef9 AC |
1492 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
1493 | { | |
1494 | const char *name = data; | |
1495 | ||
1496 | return !strcmp(chip->label, name); | |
1497 | } | |
1498 | ||
1499 | static struct gpio_chip *find_chip_by_name(const char *name) | |
1500 | { | |
1501 | return gpiochip_find((void *)name, gpiochip_match_name); | |
1502 | } | |
1503 | ||
14250520 LW |
1504 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
1505 | ||
1506 | /* | |
1507 | * The following is irqchip helper code for gpiochips. | |
1508 | */ | |
1509 | ||
79b804cb MW |
1510 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1511 | { | |
dc7b0387 | 1512 | if (!gpiochip->irq.need_valid_mask) |
79b804cb MW |
1513 | return 0; |
1514 | ||
dc7b0387 | 1515 | gpiochip->irq.valid_mask = kcalloc(BITS_TO_LONGS(gpiochip->ngpio), |
79b804cb | 1516 | sizeof(long), GFP_KERNEL); |
dc7b0387 | 1517 | if (!gpiochip->irq.valid_mask) |
79b804cb MW |
1518 | return -ENOMEM; |
1519 | ||
1520 | /* Assume by default all GPIOs are valid */ | |
dc7b0387 | 1521 | bitmap_fill(gpiochip->irq.valid_mask, gpiochip->ngpio); |
79b804cb MW |
1522 | |
1523 | return 0; | |
1524 | } | |
1525 | ||
1526 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1527 | { | |
dc7b0387 TR |
1528 | kfree(gpiochip->irq.valid_mask); |
1529 | gpiochip->irq.valid_mask = NULL; | |
79b804cb MW |
1530 | } |
1531 | ||
1532 | static bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, | |
1533 | unsigned int offset) | |
1534 | { | |
1535 | /* No mask means all valid */ | |
dc7b0387 | 1536 | if (likely(!gpiochip->irq.valid_mask)) |
79b804cb | 1537 | return true; |
dc7b0387 | 1538 | return test_bit(offset, gpiochip->irq.valid_mask); |
79b804cb MW |
1539 | } |
1540 | ||
14250520 | 1541 | /** |
d245b3f9 | 1542 | * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip |
3f97d5fc LW |
1543 | * @gpiochip: the gpiochip to set the irqchip chain to |
1544 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
1545 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
1546 | * chained irqchip | |
1547 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
1548 | * coming out of the gpiochip. If the interrupt is nested rather than |
1549 | * cascaded, pass NULL in this handler argument | |
14250520 | 1550 | */ |
d245b3f9 LW |
1551 | static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip, |
1552 | struct irq_chip *irqchip, | |
6f79309a | 1553 | unsigned int parent_irq, |
d245b3f9 | 1554 | irq_flow_handler_t parent_handler) |
14250520 | 1555 | { |
83141a77 LW |
1556 | unsigned int offset; |
1557 | ||
f0fbe7bc | 1558 | if (!gpiochip->irq.domain) { |
83141a77 LW |
1559 | chip_err(gpiochip, "called %s before setting up irqchip\n", |
1560 | __func__); | |
1c8732bb LW |
1561 | return; |
1562 | } | |
1563 | ||
3f97d5fc LW |
1564 | if (parent_handler) { |
1565 | if (gpiochip->can_sleep) { | |
1566 | chip_err(gpiochip, | |
1567 | "you cannot have chained interrupts on a " | |
1568 | "chip that may sleep\n"); | |
1569 | return; | |
1570 | } | |
3f97d5fc LW |
1571 | /* |
1572 | * The parent irqchip is already using the chip_data for this | |
1573 | * irqchip, so our callbacks simply use the handler_data. | |
1574 | */ | |
f7f87753 TG |
1575 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
1576 | gpiochip); | |
25e4fe92 | 1577 | |
39e5f096 TR |
1578 | gpiochip->irq.parents = &parent_irq; |
1579 | gpiochip->irq.num_parents = 1; | |
3f97d5fc | 1580 | } |
83141a77 LW |
1581 | |
1582 | /* Set the parent IRQ for all affected IRQs */ | |
79b804cb MW |
1583 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1584 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1585 | continue; | |
f0fbe7bc | 1586 | irq_set_parent(irq_find_mapping(gpiochip->irq.domain, offset), |
83141a77 | 1587 | parent_irq); |
79b804cb | 1588 | } |
14250520 | 1589 | } |
d245b3f9 LW |
1590 | |
1591 | /** | |
1592 | * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip | |
1593 | * @gpiochip: the gpiochip to set the irqchip chain to | |
1594 | * @irqchip: the irqchip to chain to the gpiochip | |
1595 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1596 | * chained irqchip | |
1597 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
1598 | * coming out of the gpiochip. If the interrupt is nested rather than | |
1599 | * cascaded, pass NULL in this handler argument | |
1600 | */ | |
1601 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
1602 | struct irq_chip *irqchip, | |
6f79309a | 1603 | unsigned int parent_irq, |
d245b3f9 LW |
1604 | irq_flow_handler_t parent_handler) |
1605 | { | |
1606 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, | |
1607 | parent_handler); | |
1608 | } | |
14250520 LW |
1609 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); |
1610 | ||
d245b3f9 LW |
1611 | /** |
1612 | * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip | |
1613 | * @gpiochip: the gpiochip to set the irqchip nested handler to | |
1614 | * @irqchip: the irqchip to nest to the gpiochip | |
1615 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1616 | * nested irqchip | |
1617 | */ | |
1618 | void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, | |
1619 | struct irq_chip *irqchip, | |
6f79309a | 1620 | unsigned int parent_irq) |
d245b3f9 | 1621 | { |
dc6bafee | 1622 | if (!gpiochip->irq.nested) { |
d245b3f9 LW |
1623 | chip_err(gpiochip, "tried to nest a chained gpiochip\n"); |
1624 | return; | |
1625 | } | |
1626 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, | |
1627 | NULL); | |
1628 | } | |
1629 | EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip); | |
1630 | ||
14250520 LW |
1631 | /** |
1632 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
1633 | * @d: the irqdomain used by this irqchip | |
1634 | * @irq: the global irq number used by this GPIO irqchip irq | |
1635 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
1636 | * | |
1637 | * This function will set up the mapping for a certain IRQ line on a | |
1638 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
1639 | * stored inside the gpiochip. | |
1640 | */ | |
1b95b4eb TR |
1641 | int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, |
1642 | irq_hw_number_t hwirq) | |
14250520 LW |
1643 | { |
1644 | struct gpio_chip *chip = d->host_data; | |
e0d89728 | 1645 | int err = 0; |
14250520 | 1646 | |
dc749a09 GS |
1647 | if (!gpiochip_irqchip_irq_valid(chip, hwirq)) |
1648 | return -ENXIO; | |
1649 | ||
14250520 | 1650 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
1651 | /* |
1652 | * This lock class tells lockdep that GPIO irqs are in a different | |
1653 | * category than their parents, so it won't report false recursion. | |
1654 | */ | |
ca9df053 | 1655 | irq_set_lockdep_class(irq, chip->irq.lock_key); |
c7a0aa59 | 1656 | irq_set_chip_and_handler(irq, chip->irq.chip, chip->irq.handler); |
d245b3f9 | 1657 | /* Chips that use nested thread handlers have them marked */ |
dc6bafee | 1658 | if (chip->irq.nested) |
1c8732bb | 1659 | irq_set_nested_thread(irq, 1); |
14250520 | 1660 | irq_set_noprobe(irq); |
23393d49 | 1661 | |
e0d89728 TR |
1662 | if (chip->irq.num_parents == 1) |
1663 | err = irq_set_parent(irq, chip->irq.parents[0]); | |
1664 | else if (chip->irq.map) | |
1665 | err = irq_set_parent(irq, chip->irq.map[hwirq]); | |
1666 | ||
1667 | if (err < 0) | |
1668 | return err; | |
1669 | ||
1333b90f LW |
1670 | /* |
1671 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
1672 | * is passed as default type. | |
1673 | */ | |
3634eeb0 TR |
1674 | if (chip->irq.default_type != IRQ_TYPE_NONE) |
1675 | irq_set_irq_type(irq, chip->irq.default_type); | |
14250520 LW |
1676 | |
1677 | return 0; | |
1678 | } | |
1b95b4eb | 1679 | EXPORT_SYMBOL_GPL(gpiochip_irq_map); |
14250520 | 1680 | |
1b95b4eb | 1681 | void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
c3626fde | 1682 | { |
1c8732bb LW |
1683 | struct gpio_chip *chip = d->host_data; |
1684 | ||
dc6bafee | 1685 | if (chip->irq.nested) |
1c8732bb | 1686 | irq_set_nested_thread(irq, 0); |
c3626fde LW |
1687 | irq_set_chip_and_handler(irq, NULL, NULL); |
1688 | irq_set_chip_data(irq, NULL); | |
1689 | } | |
1b95b4eb | 1690 | EXPORT_SYMBOL_GPL(gpiochip_irq_unmap); |
c3626fde | 1691 | |
14250520 LW |
1692 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1693 | .map = gpiochip_irq_map, | |
c3626fde | 1694 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1695 | /* Virtually all GPIO irqchips are twocell:ed */ |
1696 | .xlate = irq_domain_xlate_twocell, | |
1697 | }; | |
1698 | ||
1699 | static int gpiochip_irq_reqres(struct irq_data *d) | |
1700 | { | |
1701 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1702 | ||
ff2b1359 | 1703 | if (!try_module_get(chip->gpiodev->owner)) |
5b76e79c GS |
1704 | return -ENODEV; |
1705 | ||
e3a2e878 | 1706 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
1707 | chip_err(chip, |
1708 | "unable to lock HW IRQ %lu for IRQ\n", | |
1709 | d->hwirq); | |
ff2b1359 | 1710 | module_put(chip->gpiodev->owner); |
14250520 LW |
1711 | return -EINVAL; |
1712 | } | |
1713 | return 0; | |
1714 | } | |
1715 | ||
1716 | static void gpiochip_irq_relres(struct irq_data *d) | |
1717 | { | |
1718 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1719 | ||
e3a2e878 | 1720 | gpiochip_unlock_as_irq(chip, d->hwirq); |
ff2b1359 | 1721 | module_put(chip->gpiodev->owner); |
14250520 LW |
1722 | } |
1723 | ||
1724 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
1725 | { | |
dc749a09 GS |
1726 | if (!gpiochip_irqchip_irq_valid(chip, offset)) |
1727 | return -ENXIO; | |
e0d89728 | 1728 | |
f0fbe7bc | 1729 | return irq_create_mapping(chip->irq.domain, offset); |
14250520 LW |
1730 | } |
1731 | ||
e0d89728 TR |
1732 | /** |
1733 | * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip | |
1734 | * @gpiochip: the GPIO chip to add the IRQ chip to | |
1735 | */ | |
1736 | static int gpiochip_add_irqchip(struct gpio_chip *gpiochip) | |
1737 | { | |
1738 | struct irq_chip *irqchip = gpiochip->irq.chip; | |
1739 | const struct irq_domain_ops *ops; | |
1740 | struct device_node *np; | |
1741 | unsigned int type; | |
1742 | unsigned int i; | |
1743 | ||
1744 | if (!irqchip) | |
1745 | return 0; | |
1746 | ||
1747 | if (gpiochip->irq.parent_handler && gpiochip->can_sleep) { | |
1748 | chip_err(gpiochip, "you cannot have chained interrupts on a " | |
1749 | "chip that may sleep\n"); | |
1750 | return -EINVAL; | |
1751 | } | |
1752 | ||
1753 | np = gpiochip->gpiodev->dev.of_node; | |
1754 | type = gpiochip->irq.default_type; | |
1755 | ||
1756 | /* | |
1757 | * Specifying a default trigger is a terrible idea if DT or ACPI is | |
1758 | * used to configure the interrupts, as you may end up with | |
1759 | * conflicting triggers. Tell the user, and reset to NONE. | |
1760 | */ | |
1761 | if (WARN(np && type != IRQ_TYPE_NONE, | |
1762 | "%s: Ignoring %u default trigger\n", np->full_name, type)) | |
1763 | type = IRQ_TYPE_NONE; | |
1764 | ||
1765 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { | |
1766 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
1767 | "Ignoring %u default trigger\n", type); | |
1768 | type = IRQ_TYPE_NONE; | |
1769 | } | |
1770 | ||
1771 | gpiochip->to_irq = gpiochip_to_irq; | |
1772 | gpiochip->irq.default_type = type; | |
1773 | ||
1774 | if (gpiochip->irq.domain_ops) | |
1775 | ops = gpiochip->irq.domain_ops; | |
1776 | else | |
1777 | ops = &gpiochip_domain_ops; | |
1778 | ||
1779 | gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio, | |
1780 | 0, ops, gpiochip); | |
1781 | if (!gpiochip->irq.domain) | |
1782 | return -EINVAL; | |
1783 | ||
1784 | /* | |
1785 | * It is possible for a driver to override this, but only if the | |
1786 | * alternative functions are both implemented. | |
1787 | */ | |
1788 | if (!irqchip->irq_request_resources && | |
1789 | !irqchip->irq_release_resources) { | |
1790 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1791 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1792 | } | |
1793 | ||
1794 | if (gpiochip->irq.parent_handler) { | |
1795 | void *data = gpiochip->irq.parent_handler_data ?: gpiochip; | |
1796 | ||
1797 | for (i = 0; i < gpiochip->irq.num_parents; i++) { | |
1798 | /* | |
1799 | * The parent IRQ chip is already using the chip_data | |
1800 | * for this IRQ chip, so our callbacks simply use the | |
1801 | * handler_data. | |
1802 | */ | |
1803 | irq_set_chained_handler_and_data(gpiochip->irq.parents[i], | |
1804 | gpiochip->irq.parent_handler, | |
1805 | data); | |
1806 | } | |
1807 | ||
1808 | gpiochip->irq.nested = false; | |
1809 | } else { | |
1810 | gpiochip->irq.nested = true; | |
1811 | } | |
1812 | ||
1813 | acpi_gpiochip_request_interrupts(gpiochip); | |
1814 | ||
1815 | return 0; | |
1816 | } | |
1817 | ||
14250520 LW |
1818 | /** |
1819 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1820 | * @gpiochip: the gpiochip to remove the irqchip from | |
1821 | * | |
1822 | * This is called only from gpiochip_remove() | |
1823 | */ | |
1824 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1825 | { | |
39e5f096 | 1826 | unsigned int offset; |
c3626fde | 1827 | |
afa82fab MW |
1828 | acpi_gpiochip_free_interrupts(gpiochip); |
1829 | ||
e0d89728 | 1830 | if (gpiochip->irq.chip && gpiochip->irq.parent_handler) { |
39e5f096 TR |
1831 | struct gpio_irq_chip *irq = &gpiochip->irq; |
1832 | unsigned int i; | |
1833 | ||
1834 | for (i = 0; i < irq->num_parents; i++) | |
1835 | irq_set_chained_handler_and_data(irq->parents[i], | |
1836 | NULL, NULL); | |
25e4fe92 DES |
1837 | } |
1838 | ||
c3626fde | 1839 | /* Remove all IRQ mappings and delete the domain */ |
f0fbe7bc | 1840 | if (gpiochip->irq.domain) { |
39e5f096 TR |
1841 | unsigned int irq; |
1842 | ||
79b804cb MW |
1843 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1844 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1845 | continue; | |
f0fbe7bc TR |
1846 | |
1847 | irq = irq_find_mapping(gpiochip->irq.domain, offset); | |
1848 | irq_dispose_mapping(irq); | |
79b804cb | 1849 | } |
f0fbe7bc TR |
1850 | |
1851 | irq_domain_remove(gpiochip->irq.domain); | |
c3626fde | 1852 | } |
14250520 | 1853 | |
da80ff81 TR |
1854 | if (gpiochip->irq.chip) { |
1855 | gpiochip->irq.chip->irq_request_resources = NULL; | |
1856 | gpiochip->irq.chip->irq_release_resources = NULL; | |
1857 | gpiochip->irq.chip = NULL; | |
14250520 | 1858 | } |
79b804cb MW |
1859 | |
1860 | gpiochip_irqchip_free_valid_mask(gpiochip); | |
14250520 LW |
1861 | } |
1862 | ||
1863 | /** | |
739e6f59 | 1864 | * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip |
14250520 LW |
1865 | * @gpiochip: the gpiochip to add the irqchip to |
1866 | * @irqchip: the irqchip to add to the gpiochip | |
1867 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
1868 | * allocate gpiochip irqs from | |
1869 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
1870 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
1871 | * to have the core avoid setting up any default type in the hardware. | |
d245b3f9 LW |
1872 | * @nested: whether this is a nested irqchip calling handle_nested_irq() |
1873 | * in its IRQ handler | |
a0a8bcf4 | 1874 | * @lock_key: lockdep class |
14250520 LW |
1875 | * |
1876 | * This function closely associates a certain irqchip with a certain | |
1877 | * gpiochip, providing an irq domain to translate the local IRQs to | |
1878 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
1879 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 1880 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
1881 | * from the gpiochip passed as chip data. An irqdomain will be stored |
1882 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
1883 | * translation. The gpiochip will need to be initialized and registered | |
1884 | * before calling this function. | |
1885 | * | |
c3626fde LW |
1886 | * This function will handle two cell:ed simple IRQs and assumes all |
1887 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
1888 | * need to be open coded. |
1889 | */ | |
739e6f59 LW |
1890 | int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, |
1891 | struct irq_chip *irqchip, | |
1892 | unsigned int first_irq, | |
1893 | irq_flow_handler_t handler, | |
1894 | unsigned int type, | |
1895 | bool nested, | |
1896 | struct lock_class_key *lock_key) | |
14250520 LW |
1897 | { |
1898 | struct device_node *of_node; | |
14250520 LW |
1899 | |
1900 | if (!gpiochip || !irqchip) | |
1901 | return -EINVAL; | |
1902 | ||
58383c78 | 1903 | if (!gpiochip->parent) { |
14250520 LW |
1904 | pr_err("missing gpiochip .dev parent pointer\n"); |
1905 | return -EINVAL; | |
1906 | } | |
dc6bafee | 1907 | gpiochip->irq.nested = nested; |
58383c78 | 1908 | of_node = gpiochip->parent->of_node; |
14250520 LW |
1909 | #ifdef CONFIG_OF_GPIO |
1910 | /* | |
20a8a968 | 1911 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
1912 | * FIXME: get rid of this and use gpiochip->parent->of_node |
1913 | * everywhere | |
14250520 LW |
1914 | */ |
1915 | if (gpiochip->of_node) | |
1916 | of_node = gpiochip->of_node; | |
1917 | #endif | |
332e99d5 | 1918 | /* |
0a1e0053 | 1919 | * Specifying a default trigger is a terrible idea if DT or ACPI is |
332e99d5 MZ |
1920 | * used to configure the interrupts, as you may end-up with |
1921 | * conflicting triggers. Tell the user, and reset to NONE. | |
1922 | */ | |
1923 | if (WARN(of_node && type != IRQ_TYPE_NONE, | |
7eb6ce2f | 1924 | "%pOF: Ignoring %d default trigger\n", of_node, type)) |
332e99d5 | 1925 | type = IRQ_TYPE_NONE; |
0a1e0053 MW |
1926 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { |
1927 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
1928 | "Ignoring %d default trigger\n", type); | |
1929 | type = IRQ_TYPE_NONE; | |
1930 | } | |
332e99d5 | 1931 | |
da80ff81 | 1932 | gpiochip->irq.chip = irqchip; |
c7a0aa59 | 1933 | gpiochip->irq.handler = handler; |
3634eeb0 | 1934 | gpiochip->irq.default_type = type; |
14250520 | 1935 | gpiochip->to_irq = gpiochip_to_irq; |
ca9df053 | 1936 | gpiochip->irq.lock_key = lock_key; |
f0fbe7bc | 1937 | gpiochip->irq.domain = irq_domain_add_simple(of_node, |
14250520 LW |
1938 | gpiochip->ngpio, first_irq, |
1939 | &gpiochip_domain_ops, gpiochip); | |
f0fbe7bc | 1940 | if (!gpiochip->irq.domain) { |
da80ff81 | 1941 | gpiochip->irq.chip = NULL; |
14250520 LW |
1942 | return -EINVAL; |
1943 | } | |
8b67a1f0 RV |
1944 | |
1945 | /* | |
1946 | * It is possible for a driver to override this, but only if the | |
1947 | * alternative functions are both implemented. | |
1948 | */ | |
1949 | if (!irqchip->irq_request_resources && | |
1950 | !irqchip->irq_release_resources) { | |
1951 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1952 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1953 | } | |
14250520 | 1954 | |
afa82fab MW |
1955 | acpi_gpiochip_request_interrupts(gpiochip); |
1956 | ||
14250520 LW |
1957 | return 0; |
1958 | } | |
739e6f59 | 1959 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key); |
14250520 LW |
1960 | |
1961 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
1962 | ||
e0d89728 TR |
1963 | static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip) |
1964 | { | |
1965 | return 0; | |
1966 | } | |
1967 | ||
14250520 | 1968 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} |
79b804cb MW |
1969 | static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1970 | { | |
1971 | return 0; | |
1972 | } | |
1973 | static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1974 | { } | |
14250520 LW |
1975 | |
1976 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
1977 | ||
c771c2f4 JG |
1978 | /** |
1979 | * gpiochip_generic_request() - request the gpio function for a pin | |
1980 | * @chip: the gpiochip owning the GPIO | |
1981 | * @offset: the offset of the GPIO to request for GPIO function | |
1982 | */ | |
1983 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
1984 | { | |
fdeb8e15 | 1985 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1986 | } |
1987 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
1988 | ||
1989 | /** | |
1990 | * gpiochip_generic_free() - free the gpio function from a pin | |
1991 | * @chip: the gpiochip to request the gpio function for | |
1992 | * @offset: the offset of the GPIO to free from GPIO function | |
1993 | */ | |
1994 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
1995 | { | |
fdeb8e15 | 1996 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1997 | } |
1998 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
1999 | ||
2956b5d9 MW |
2000 | /** |
2001 | * gpiochip_generic_config() - apply configuration for a pin | |
2002 | * @chip: the gpiochip owning the GPIO | |
2003 | * @offset: the offset of the GPIO to apply the configuration | |
2004 | * @config: the configuration to be applied | |
2005 | */ | |
2006 | int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset, | |
2007 | unsigned long config) | |
2008 | { | |
2009 | return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config); | |
2010 | } | |
2011 | EXPORT_SYMBOL_GPL(gpiochip_generic_config); | |
2012 | ||
f23f1516 | 2013 | #ifdef CONFIG_PINCTRL |
165adc9c | 2014 | |
586a87e6 CR |
2015 | /** |
2016 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
2017 | * @chip: the gpiochip to add the range for | |
d32651f6 | 2018 | * @pctldev: the pin controller to map to |
586a87e6 CR |
2019 | * @gpio_offset: the start offset in the current gpio_chip number space |
2020 | * @pin_group: name of the pin group inside the pin controller | |
2021 | */ | |
2022 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
2023 | struct pinctrl_dev *pctldev, | |
2024 | unsigned int gpio_offset, const char *pin_group) | |
2025 | { | |
2026 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2027 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
2028 | int ret; |
2029 | ||
2030 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
2031 | if (!pin_range) { | |
1a2a99c6 | 2032 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
2033 | return -ENOMEM; |
2034 | } | |
2035 | ||
2036 | /* Use local offset as range ID */ | |
2037 | pin_range->range.id = gpio_offset; | |
2038 | pin_range->range.gc = chip; | |
2039 | pin_range->range.name = chip->label; | |
fdeb8e15 | 2040 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
2041 | pin_range->pctldev = pctldev; |
2042 | ||
2043 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
2044 | &pin_range->range.pins, | |
2045 | &pin_range->range.npins); | |
61c6375d MN |
2046 | if (ret < 0) { |
2047 | kfree(pin_range); | |
586a87e6 | 2048 | return ret; |
61c6375d | 2049 | } |
586a87e6 CR |
2050 | |
2051 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
2052 | ||
1a2a99c6 AS |
2053 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
2054 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
2055 | pinctrl_dev_get_devname(pctldev), pin_group); |
2056 | ||
20ec3e39 | 2057 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
2058 | |
2059 | return 0; | |
2060 | } | |
2061 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
2062 | ||
3f0f8670 LW |
2063 | /** |
2064 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
2065 | * @chip: the gpiochip to add the range for | |
950d55f5 | 2066 | * @pinctl_name: the dev_name() of the pin controller to map to |
316511c0 LW |
2067 | * @gpio_offset: the start offset in the current gpio_chip number space |
2068 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
2069 | * @npins: the number of pins from the offset of each pin space (GPIO and |
2070 | * pin controller) to accumulate in this range | |
950d55f5 TR |
2071 | * |
2072 | * Returns: | |
2073 | * 0 on success, or a negative error-code on failure. | |
3f0f8670 | 2074 | */ |
1e63d7b9 | 2075 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 2076 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 2077 | unsigned int npins) |
f23f1516 SH |
2078 | { |
2079 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2080 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 2081 | int ret; |
f23f1516 | 2082 | |
3f0f8670 | 2083 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 2084 | if (!pin_range) { |
1a2a99c6 | 2085 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 2086 | return -ENOMEM; |
f23f1516 SH |
2087 | } |
2088 | ||
3f0f8670 | 2089 | /* Use local offset as range ID */ |
316511c0 | 2090 | pin_range->range.id = gpio_offset; |
3f0f8670 | 2091 | pin_range->range.gc = chip; |
f23f1516 | 2092 | pin_range->range.name = chip->label; |
fdeb8e15 | 2093 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 2094 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 2095 | pin_range->range.npins = npins; |
192c369c | 2096 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 2097 | &pin_range->range); |
8f23ca1a | 2098 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 2099 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 2100 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 2101 | kfree(pin_range); |
b4d4b1f0 | 2102 | return ret; |
3f0f8670 | 2103 | } |
1a2a99c6 AS |
2104 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
2105 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
2106 | pinctl_name, |
2107 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 2108 | |
20ec3e39 | 2109 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
2110 | |
2111 | return 0; | |
f23f1516 | 2112 | } |
165adc9c | 2113 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 2114 | |
3f0f8670 LW |
2115 | /** |
2116 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
2117 | * @chip: the chip to remove all the mappings for | |
2118 | */ | |
f23f1516 SH |
2119 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
2120 | { | |
2121 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 2122 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 2123 | |
20ec3e39 | 2124 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
2125 | list_del(&pin_range->node); |
2126 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
2127 | &pin_range->range); | |
3f0f8670 | 2128 | kfree(pin_range); |
f23f1516 SH |
2129 | } |
2130 | } | |
165adc9c LW |
2131 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
2132 | ||
2133 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 2134 | |
d2876d08 DB |
2135 | /* These "optional" allocation calls help prevent drivers from stomping |
2136 | * on each other, and help provide better diagnostics in debugfs. | |
2137 | * They're called even less than the "set direction" calls. | |
2138 | */ | |
fac9d885 | 2139 | static int gpiod_request_commit(struct gpio_desc *desc, const char *label) |
d2876d08 | 2140 | { |
fdeb8e15 | 2141 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 2142 | int status; |
d2876d08 DB |
2143 | unsigned long flags; |
2144 | ||
bcabdef1 AC |
2145 | spin_lock_irqsave(&gpio_lock, flags); |
2146 | ||
d2876d08 | 2147 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 2148 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
2149 | */ |
2150 | ||
2151 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
2152 | desc_set_label(desc, label ? : "?"); | |
2153 | status = 0; | |
438d8908 | 2154 | } else { |
d2876d08 | 2155 | status = -EBUSY; |
7460db56 | 2156 | goto done; |
35e8bb51 DB |
2157 | } |
2158 | ||
2159 | if (chip->request) { | |
2160 | /* chip->request may sleep */ | |
2161 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 2162 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2163 | spin_lock_irqsave(&gpio_lock, flags); |
2164 | ||
2165 | if (status < 0) { | |
2166 | desc_set_label(desc, NULL); | |
35e8bb51 | 2167 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 2168 | goto done; |
35e8bb51 | 2169 | } |
438d8908 | 2170 | } |
80b0a602 MN |
2171 | if (chip->get_direction) { |
2172 | /* chip->get_direction may sleep */ | |
2173 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 2174 | gpiod_get_direction(desc); |
80b0a602 MN |
2175 | spin_lock_irqsave(&gpio_lock, flags); |
2176 | } | |
77c2d792 MW |
2177 | done: |
2178 | spin_unlock_irqrestore(&gpio_lock, flags); | |
2179 | return status; | |
2180 | } | |
2181 | ||
fdeb8e15 LW |
2182 | /* |
2183 | * This descriptor validation needs to be inserted verbatim into each | |
2184 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
2185 | * macro to avoid endless duplication. If the desc is NULL it is an |
2186 | * optional GPIO and calls should just bail out. | |
fdeb8e15 LW |
2187 | */ |
2188 | #define VALIDATE_DESC(desc) do { \ | |
54d77198 LW |
2189 | if (!desc) \ |
2190 | return 0; \ | |
bfbbe44d LW |
2191 | if (IS_ERR(desc)) { \ |
2192 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
2193 | return PTR_ERR(desc); \ | |
2194 | } \ | |
54d77198 | 2195 | if (!desc->gdev) { \ |
bfbbe44d | 2196 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
2197 | return -EINVAL; \ |
2198 | } \ | |
2199 | if ( !desc->gdev->chip ) { \ | |
2200 | dev_warn(&desc->gdev->dev, \ | |
2201 | "%s: backing chip is gone\n", __func__); \ | |
2202 | return 0; \ | |
2203 | } } while (0) | |
2204 | ||
2205 | #define VALIDATE_DESC_VOID(desc) do { \ | |
54d77198 LW |
2206 | if (!desc) \ |
2207 | return; \ | |
bfbbe44d LW |
2208 | if (IS_ERR(desc)) { \ |
2209 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
2210 | return; \ | |
2211 | } \ | |
54d77198 | 2212 | if (!desc->gdev) { \ |
bfbbe44d | 2213 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
2214 | return; \ |
2215 | } \ | |
2216 | if (!desc->gdev->chip) { \ | |
2217 | dev_warn(&desc->gdev->dev, \ | |
2218 | "%s: backing chip is gone\n", __func__); \ | |
2219 | return; \ | |
2220 | } } while (0) | |
2221 | ||
2222 | ||
0eb4c6c2 | 2223 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
2224 | { |
2225 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 2226 | struct gpio_device *gdev; |
77c2d792 | 2227 | |
fdeb8e15 LW |
2228 | VALIDATE_DESC(desc); |
2229 | gdev = desc->gdev; | |
77c2d792 | 2230 | |
fdeb8e15 | 2231 | if (try_module_get(gdev->owner)) { |
fac9d885 | 2232 | status = gpiod_request_commit(desc, label); |
77c2d792 | 2233 | if (status < 0) |
fdeb8e15 | 2234 | module_put(gdev->owner); |
33a68e86 LW |
2235 | else |
2236 | get_device(&gdev->dev); | |
77c2d792 MW |
2237 | } |
2238 | ||
d2876d08 | 2239 | if (status) |
7589e59f | 2240 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 2241 | |
d2876d08 DB |
2242 | return status; |
2243 | } | |
372e722e | 2244 | |
fac9d885 | 2245 | static bool gpiod_free_commit(struct gpio_desc *desc) |
d2876d08 | 2246 | { |
77c2d792 | 2247 | bool ret = false; |
d2876d08 | 2248 | unsigned long flags; |
35e8bb51 | 2249 | struct gpio_chip *chip; |
d2876d08 | 2250 | |
3d599d1c UKK |
2251 | might_sleep(); |
2252 | ||
372e722e | 2253 | gpiod_unexport(desc); |
d8f388d8 | 2254 | |
d2876d08 DB |
2255 | spin_lock_irqsave(&gpio_lock, flags); |
2256 | ||
fdeb8e15 | 2257 | chip = desc->gdev->chip; |
35e8bb51 DB |
2258 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
2259 | if (chip->free) { | |
2260 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 2261 | might_sleep_if(chip->can_sleep); |
372e722e | 2262 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2263 | spin_lock_irqsave(&gpio_lock, flags); |
2264 | } | |
d2876d08 | 2265 | desc_set_label(desc, NULL); |
07697461 | 2266 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 2267 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 2268 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 2269 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 2270 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
2271 | ret = true; |
2272 | } | |
d2876d08 DB |
2273 | |
2274 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
2275 | return ret; |
2276 | } | |
2277 | ||
0eb4c6c2 | 2278 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 2279 | { |
fac9d885 | 2280 | if (desc && desc->gdev && gpiod_free_commit(desc)) { |
fdeb8e15 | 2281 | module_put(desc->gdev->owner); |
33a68e86 LW |
2282 | put_device(&desc->gdev->dev); |
2283 | } else { | |
77c2d792 | 2284 | WARN_ON(extra_checks); |
33a68e86 | 2285 | } |
d2876d08 | 2286 | } |
372e722e | 2287 | |
d2876d08 DB |
2288 | /** |
2289 | * gpiochip_is_requested - return string iff signal was requested | |
2290 | * @chip: controller managing the signal | |
2291 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
2292 | * | |
2293 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
2294 | * The string returned is the label passed to gpio_request(); if none has been |
2295 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
2296 | * |
2297 | * This function is for use by GPIO controller drivers. The label can | |
2298 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
2299 | * can help avoid accidentally multiplexing it to another controller. | |
2300 | */ | |
2301 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
2302 | { | |
6c0b4e6c | 2303 | struct gpio_desc *desc; |
d2876d08 | 2304 | |
48b5953e | 2305 | if (offset >= chip->ngpio) |
d2876d08 | 2306 | return NULL; |
6c0b4e6c | 2307 | |
1c3cdb18 | 2308 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 2309 | |
372e722e | 2310 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 2311 | return NULL; |
372e722e | 2312 | return desc->label; |
d2876d08 DB |
2313 | } |
2314 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
2315 | ||
77c2d792 MW |
2316 | /** |
2317 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
950d55f5 TR |
2318 | * @chip: GPIO chip |
2319 | * @hwnum: hardware number of the GPIO for which to request the descriptor | |
77c2d792 MW |
2320 | * @label: label for the GPIO |
2321 | * | |
2322 | * Function allows GPIO chip drivers to request and use their own GPIO | |
2323 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
2324 | * function will not increase reference count of the GPIO chip module. This | |
2325 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
2326 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
950d55f5 TR |
2327 | * |
2328 | * Returns: | |
2329 | * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error | |
2330 | * code on failure. | |
77c2d792 | 2331 | */ |
abdc08a3 AC |
2332 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
2333 | const char *label) | |
77c2d792 | 2334 | { |
abdc08a3 AC |
2335 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
2336 | int err; | |
77c2d792 | 2337 | |
abdc08a3 AC |
2338 | if (IS_ERR(desc)) { |
2339 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
2340 | return desc; | |
2341 | } | |
2342 | ||
fac9d885 | 2343 | err = gpiod_request_commit(desc, label); |
abdc08a3 AC |
2344 | if (err < 0) |
2345 | return ERR_PTR(err); | |
77c2d792 | 2346 | |
abdc08a3 | 2347 | return desc; |
77c2d792 | 2348 | } |
f7d4ad98 | 2349 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
2350 | |
2351 | /** | |
2352 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
2353 | * @desc: GPIO descriptor to free | |
2354 | * | |
2355 | * Function frees the given GPIO requested previously with | |
2356 | * gpiochip_request_own_desc(). | |
2357 | */ | |
2358 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
2359 | { | |
2360 | if (desc) | |
fac9d885 | 2361 | gpiod_free_commit(desc); |
77c2d792 | 2362 | } |
f7d4ad98 | 2363 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 2364 | |
fdeb8e15 LW |
2365 | /* |
2366 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
2367 | * some cases this is done in early boot, before IRQs are enabled. |
2368 | * | |
2369 | * As a rule these aren't called more than once (except for drivers | |
2370 | * using the open-drain emulation idiom) so these are natural places | |
2371 | * to accumulate extra debugging checks. Note that we can't (yet) | |
2372 | * rely on gpio_request() having been called beforehand. | |
2373 | */ | |
2374 | ||
79a9becd AC |
2375 | /** |
2376 | * gpiod_direction_input - set the GPIO direction to input | |
2377 | * @desc: GPIO to set to input | |
2378 | * | |
2379 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
2380 | * be called safely on it. | |
2381 | * | |
2382 | * Return 0 in case of success, else an error code. | |
2383 | */ | |
2384 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 2385 | { |
d2876d08 | 2386 | struct gpio_chip *chip; |
d2876d08 DB |
2387 | int status = -EINVAL; |
2388 | ||
fdeb8e15 LW |
2389 | VALIDATE_DESC(desc); |
2390 | chip = desc->gdev->chip; | |
bcabdef1 | 2391 | |
be1a4b13 | 2392 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
2393 | gpiod_warn(desc, |
2394 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 2395 | __func__); |
be1a4b13 LW |
2396 | return -EIO; |
2397 | } | |
2398 | ||
d82da797 | 2399 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
2400 | if (status == 0) |
2401 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 2402 | |
372e722e | 2403 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 2404 | |
d2876d08 DB |
2405 | return status; |
2406 | } | |
79a9becd | 2407 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 2408 | |
2956b5d9 MW |
2409 | static int gpio_set_drive_single_ended(struct gpio_chip *gc, unsigned offset, |
2410 | enum pin_config_param mode) | |
2411 | { | |
2412 | unsigned long config = { PIN_CONF_PACKED(mode, 0) }; | |
2413 | ||
2414 | return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP; | |
2415 | } | |
2416 | ||
fac9d885 | 2417 | static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) |
d2876d08 | 2418 | { |
c663e5f5 | 2419 | struct gpio_chip *gc = desc->gdev->chip; |
ad17731d | 2420 | int val = !!value; |
c663e5f5 | 2421 | int ret; |
d2876d08 | 2422 | |
c663e5f5 | 2423 | if (!gc->set || !gc->direction_output) { |
6424de5a MB |
2424 | gpiod_warn(desc, |
2425 | "%s: missing set() or direction_output() operations\n", | |
2426 | __func__); | |
be1a4b13 LW |
2427 | return -EIO; |
2428 | } | |
2429 | ||
ad17731d | 2430 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val); |
c663e5f5 | 2431 | if (!ret) |
d2876d08 | 2432 | set_bit(FLAG_IS_OUT, &desc->flags); |
ad17731d | 2433 | trace_gpio_value(desc_to_gpio(desc), 0, val); |
c663e5f5 LW |
2434 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
2435 | return ret; | |
d2876d08 | 2436 | } |
ef70bbe1 PZ |
2437 | |
2438 | /** | |
2439 | * gpiod_direction_output_raw - set the GPIO direction to output | |
2440 | * @desc: GPIO to set to output | |
2441 | * @value: initial output value of the GPIO | |
2442 | * | |
2443 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2444 | * be called safely on it. The initial value of the output must be specified | |
2445 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
2446 | * | |
2447 | * Return 0 in case of success, else an error code. | |
2448 | */ | |
2449 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
2450 | { | |
fdeb8e15 | 2451 | VALIDATE_DESC(desc); |
fac9d885 | 2452 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 PZ |
2453 | } |
2454 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
2455 | ||
2456 | /** | |
90df4fe0 | 2457 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
2458 | * @desc: GPIO to set to output |
2459 | * @value: initial output value of the GPIO | |
2460 | * | |
2461 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2462 | * be called safely on it. The initial value of the output must be specified | |
2463 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2464 | * account. | |
2465 | * | |
2466 | * Return 0 in case of success, else an error code. | |
2467 | */ | |
2468 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
2469 | { | |
02e47980 LW |
2470 | struct gpio_chip *gc = desc->gdev->chip; |
2471 | int ret; | |
2472 | ||
fdeb8e15 | 2473 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2474 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2475 | value = !value; | |
ad17731d LW |
2476 | else |
2477 | value = !!value; | |
02e47980 LW |
2478 | |
2479 | /* GPIOs used for IRQs shall not be set as output */ | |
2480 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
2481 | gpiod_err(desc, | |
2482 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
2483 | __func__); | |
2484 | return -EIO; | |
2485 | } | |
2486 | ||
2487 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
2488 | /* First see if we can enable open drain in hardware */ | |
2489 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2490 | PIN_CONFIG_DRIVE_OPEN_DRAIN); | |
2491 | if (!ret) | |
2492 | goto set_output_value; | |
2493 | /* Emulate open drain by not actively driving the line high */ | |
2494 | if (value) | |
2495 | return gpiod_direction_input(desc); | |
2496 | } | |
2497 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
2498 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2499 | PIN_CONFIG_DRIVE_OPEN_SOURCE); | |
2500 | if (!ret) | |
2501 | goto set_output_value; | |
2502 | /* Emulate open source by not actively driving the line low */ | |
2503 | if (!value) | |
2504 | return gpiod_direction_input(desc); | |
2505 | } else { | |
2506 | gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2507 | PIN_CONFIG_DRIVE_PUSH_PULL); | |
2508 | } | |
2509 | ||
2510 | set_output_value: | |
fac9d885 | 2511 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 | 2512 | } |
79a9becd | 2513 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 2514 | |
c4b5be98 | 2515 | /** |
950d55f5 TR |
2516 | * gpiod_set_debounce - sets @debounce time for a GPIO |
2517 | * @desc: descriptor of the GPIO for which to set debounce time | |
2518 | * @debounce: debounce time in microseconds | |
65d87656 | 2519 | * |
950d55f5 TR |
2520 | * Returns: |
2521 | * 0 on success, %-ENOTSUPP if the controller doesn't support setting the | |
2522 | * debounce time. | |
c4b5be98 | 2523 | */ |
79a9becd | 2524 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 2525 | { |
c4b5be98 | 2526 | struct gpio_chip *chip; |
2956b5d9 | 2527 | unsigned long config; |
c4b5be98 | 2528 | |
fdeb8e15 LW |
2529 | VALIDATE_DESC(desc); |
2530 | chip = desc->gdev->chip; | |
2956b5d9 | 2531 | if (!chip->set || !chip->set_config) { |
6424de5a | 2532 | gpiod_dbg(desc, |
2956b5d9 | 2533 | "%s: missing set() or set_config() operations\n", |
6424de5a | 2534 | __func__); |
65d87656 | 2535 | return -ENOTSUPP; |
be1a4b13 LW |
2536 | } |
2537 | ||
2956b5d9 MW |
2538 | config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce); |
2539 | return chip->set_config(chip, gpio_chip_hwgpio(desc), config); | |
c4b5be98 | 2540 | } |
79a9becd | 2541 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 2542 | |
79a9becd AC |
2543 | /** |
2544 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
2545 | * @desc: the gpio descriptor to test | |
2546 | * | |
2547 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
2548 | */ | |
2549 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 2550 | { |
fdeb8e15 | 2551 | VALIDATE_DESC(desc); |
79a9becd | 2552 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 2553 | } |
79a9becd | 2554 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
2555 | |
2556 | /* I/O calls are only valid after configuration completed; the relevant | |
2557 | * "is this a valid GPIO" error checks should already have been done. | |
2558 | * | |
2559 | * "Get" operations are often inlinable as reading a pin value register, | |
2560 | * and masking the relevant bit in that register. | |
2561 | * | |
2562 | * When "set" operations are inlinable, they involve writing that mask to | |
2563 | * one register to set a low value, or a different register to set it high. | |
2564 | * Otherwise locking is needed, so there may be little value to inlining. | |
2565 | * | |
2566 | *------------------------------------------------------------------------ | |
2567 | * | |
2568 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
2569 | * have requested the GPIO. That can include implicit requesting by | |
2570 | * a direction setting call. Marking a gpio as requested locks its chip | |
2571 | * in memory, guaranteeing that these table lookups need no more locking | |
2572 | * and that gpiochip_remove() will fail. | |
2573 | * | |
2574 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
2575 | * that the GPIO was actually requested. | |
2576 | */ | |
2577 | ||
fac9d885 | 2578 | static int gpiod_get_raw_value_commit(const struct gpio_desc *desc) |
d2876d08 DB |
2579 | { |
2580 | struct gpio_chip *chip; | |
372e722e | 2581 | int offset; |
e20538b8 | 2582 | int value; |
d2876d08 | 2583 | |
fdeb8e15 | 2584 | chip = desc->gdev->chip; |
372e722e | 2585 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 2586 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 2587 | value = value < 0 ? value : !!value; |
372e722e | 2588 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 2589 | return value; |
d2876d08 | 2590 | } |
372e722e | 2591 | |
eec1d566 LW |
2592 | static int gpio_chip_get_multiple(struct gpio_chip *chip, |
2593 | unsigned long *mask, unsigned long *bits) | |
2594 | { | |
2595 | if (chip->get_multiple) { | |
2596 | return chip->get_multiple(chip, mask, bits); | |
2597 | } else if (chip->get) { | |
2598 | int i, value; | |
2599 | ||
2600 | for_each_set_bit(i, mask, chip->ngpio) { | |
2601 | value = chip->get(chip, i); | |
2602 | if (value < 0) | |
2603 | return value; | |
2604 | __assign_bit(i, bits, value); | |
2605 | } | |
2606 | return 0; | |
2607 | } | |
2608 | return -EIO; | |
2609 | } | |
2610 | ||
2611 | int gpiod_get_array_value_complex(bool raw, bool can_sleep, | |
2612 | unsigned int array_size, | |
2613 | struct gpio_desc **desc_array, | |
2614 | int *value_array) | |
2615 | { | |
2616 | int i = 0; | |
2617 | ||
2618 | while (i < array_size) { | |
2619 | struct gpio_chip *chip = desc_array[i]->gdev->chip; | |
2620 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; | |
2621 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
2622 | int first, j, ret; | |
2623 | ||
2624 | if (!can_sleep) | |
2625 | WARN_ON(chip->can_sleep); | |
2626 | ||
2627 | /* collect all inputs belonging to the same chip */ | |
2628 | first = i; | |
2629 | memset(mask, 0, sizeof(mask)); | |
2630 | do { | |
2631 | const struct gpio_desc *desc = desc_array[i]; | |
2632 | int hwgpio = gpio_chip_hwgpio(desc); | |
2633 | ||
2634 | __set_bit(hwgpio, mask); | |
2635 | i++; | |
2636 | } while ((i < array_size) && | |
2637 | (desc_array[i]->gdev->chip == chip)); | |
2638 | ||
2639 | ret = gpio_chip_get_multiple(chip, mask, bits); | |
2640 | if (ret) | |
2641 | return ret; | |
2642 | ||
2643 | for (j = first; j < i; j++) { | |
2644 | const struct gpio_desc *desc = desc_array[j]; | |
2645 | int hwgpio = gpio_chip_hwgpio(desc); | |
2646 | int value = test_bit(hwgpio, bits); | |
2647 | ||
2648 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2649 | value = !value; | |
2650 | value_array[j] = value; | |
2651 | trace_gpio_value(desc_to_gpio(desc), 1, value); | |
2652 | } | |
2653 | } | |
2654 | return 0; | |
2655 | } | |
2656 | ||
d2876d08 | 2657 | /** |
79a9becd AC |
2658 | * gpiod_get_raw_value() - return a gpio's raw value |
2659 | * @desc: gpio whose value will be returned | |
d2876d08 | 2660 | * |
79a9becd | 2661 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 2662 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2663 | * |
2664 | * This function should be called from contexts where we cannot sleep, and will | |
2665 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2666 | */ |
79a9becd | 2667 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 2668 | { |
fdeb8e15 | 2669 | VALIDATE_DESC(desc); |
e4e449e8 | 2670 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2671 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 2672 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 2673 | } |
79a9becd | 2674 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 2675 | |
79a9becd AC |
2676 | /** |
2677 | * gpiod_get_value() - return a gpio's value | |
2678 | * @desc: gpio whose value will be returned | |
2679 | * | |
2680 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2681 | * account, or negative errno on failure. |
79a9becd AC |
2682 | * |
2683 | * This function should be called from contexts where we cannot sleep, and will | |
2684 | * complain if the GPIO chip functions potentially sleep. | |
2685 | */ | |
2686 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 2687 | { |
79a9becd | 2688 | int value; |
fdeb8e15 LW |
2689 | |
2690 | VALIDATE_DESC(desc); | |
79a9becd | 2691 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2692 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2693 | |
fac9d885 | 2694 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
2695 | if (value < 0) |
2696 | return value; | |
2697 | ||
79a9becd AC |
2698 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2699 | value = !value; | |
2700 | ||
2701 | return value; | |
372e722e | 2702 | } |
79a9becd | 2703 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 2704 | |
eec1d566 LW |
2705 | /** |
2706 | * gpiod_get_raw_array_value() - read raw values from an array of GPIOs | |
2707 | * @array_size: number of elements in the descriptor / value arrays | |
2708 | * @desc_array: array of GPIO descriptors whose values will be read | |
2709 | * @value_array: array to store the read values | |
2710 | * | |
2711 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
2712 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
2713 | * else an error code. | |
2714 | * | |
2715 | * This function should be called from contexts where we cannot sleep, | |
2716 | * and it will complain if the GPIO chip functions potentially sleep. | |
2717 | */ | |
2718 | int gpiod_get_raw_array_value(unsigned int array_size, | |
2719 | struct gpio_desc **desc_array, int *value_array) | |
2720 | { | |
2721 | if (!desc_array) | |
2722 | return -EINVAL; | |
2723 | return gpiod_get_array_value_complex(true, false, array_size, | |
2724 | desc_array, value_array); | |
2725 | } | |
2726 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value); | |
2727 | ||
2728 | /** | |
2729 | * gpiod_get_array_value() - read values from an array of GPIOs | |
2730 | * @array_size: number of elements in the descriptor / value arrays | |
2731 | * @desc_array: array of GPIO descriptors whose values will be read | |
2732 | * @value_array: array to store the read values | |
2733 | * | |
2734 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2735 | * into account. Return 0 in case of success, else an error code. | |
2736 | * | |
2737 | * This function should be called from contexts where we cannot sleep, | |
2738 | * and it will complain if the GPIO chip functions potentially sleep. | |
2739 | */ | |
2740 | int gpiod_get_array_value(unsigned int array_size, | |
2741 | struct gpio_desc **desc_array, int *value_array) | |
2742 | { | |
2743 | if (!desc_array) | |
2744 | return -EINVAL; | |
2745 | return gpiod_get_array_value_complex(false, false, array_size, | |
2746 | desc_array, value_array); | |
2747 | } | |
2748 | EXPORT_SYMBOL_GPL(gpiod_get_array_value); | |
2749 | ||
aca5ce14 | 2750 | /* |
fac9d885 | 2751 | * gpio_set_open_drain_value_commit() - Set the open drain gpio's value. |
79a9becd | 2752 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 2753 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 2754 | */ |
fac9d885 | 2755 | static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
2756 | { |
2757 | int err = 0; | |
fdeb8e15 | 2758 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2759 | int offset = gpio_chip_hwgpio(desc); |
2760 | ||
aca5ce14 | 2761 | if (value) { |
372e722e | 2762 | err = chip->direction_input(chip, offset); |
aca5ce14 | 2763 | if (!err) |
372e722e | 2764 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2765 | } else { |
372e722e | 2766 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 2767 | if (!err) |
372e722e | 2768 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2769 | } |
372e722e | 2770 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 2771 | if (err < 0) |
6424de5a MB |
2772 | gpiod_err(desc, |
2773 | "%s: Error in set_value for open drain err %d\n", | |
2774 | __func__, err); | |
aca5ce14 LD |
2775 | } |
2776 | ||
25553ff0 | 2777 | /* |
79a9becd AC |
2778 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
2779 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 2780 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 2781 | */ |
fac9d885 | 2782 | static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value) |
25553ff0 LD |
2783 | { |
2784 | int err = 0; | |
fdeb8e15 | 2785 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2786 | int offset = gpio_chip_hwgpio(desc); |
2787 | ||
25553ff0 | 2788 | if (value) { |
372e722e | 2789 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 2790 | if (!err) |
372e722e | 2791 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2792 | } else { |
372e722e | 2793 | err = chip->direction_input(chip, offset); |
25553ff0 | 2794 | if (!err) |
372e722e | 2795 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2796 | } |
372e722e | 2797 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 2798 | if (err < 0) |
6424de5a MB |
2799 | gpiod_err(desc, |
2800 | "%s: Error in set_value for open source err %d\n", | |
2801 | __func__, err); | |
25553ff0 LD |
2802 | } |
2803 | ||
fac9d885 | 2804 | static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value) |
d2876d08 DB |
2805 | { |
2806 | struct gpio_chip *chip; | |
2807 | ||
fdeb8e15 | 2808 | chip = desc->gdev->chip; |
372e722e | 2809 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
02e47980 | 2810 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
372e722e AC |
2811 | } |
2812 | ||
5f424243 RI |
2813 | /* |
2814 | * set multiple outputs on the same chip; | |
2815 | * use the chip's set_multiple function if available; | |
2816 | * otherwise set the outputs sequentially; | |
2817 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
2818 | * defines which outputs are to be changed | |
2819 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
2820 | * defines the values the outputs specified by mask are to be set to | |
2821 | */ | |
2822 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
2823 | unsigned long *mask, unsigned long *bits) | |
2824 | { | |
2825 | if (chip->set_multiple) { | |
2826 | chip->set_multiple(chip, mask, bits); | |
2827 | } else { | |
5e4e6fb3 AS |
2828 | unsigned int i; |
2829 | ||
2830 | /* set outputs if the corresponding mask bit is set */ | |
2831 | for_each_set_bit(i, mask, chip->ngpio) | |
2832 | chip->set(chip, i, test_bit(i, bits)); | |
5f424243 RI |
2833 | } |
2834 | } | |
2835 | ||
44c7288f LW |
2836 | void gpiod_set_array_value_complex(bool raw, bool can_sleep, |
2837 | unsigned int array_size, | |
2838 | struct gpio_desc **desc_array, | |
2839 | int *value_array) | |
5f424243 RI |
2840 | { |
2841 | int i = 0; | |
2842 | ||
2843 | while (i < array_size) { | |
fdeb8e15 | 2844 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
5f424243 RI |
2845 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
2846 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
2847 | int count = 0; | |
2848 | ||
38e003f4 | 2849 | if (!can_sleep) |
5f424243 | 2850 | WARN_ON(chip->can_sleep); |
38e003f4 | 2851 | |
5f424243 RI |
2852 | memset(mask, 0, sizeof(mask)); |
2853 | do { | |
2854 | struct gpio_desc *desc = desc_array[i]; | |
2855 | int hwgpio = gpio_chip_hwgpio(desc); | |
2856 | int value = value_array[i]; | |
2857 | ||
2858 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2859 | value = !value; | |
2860 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
2861 | /* | |
2862 | * collect all normal outputs belonging to the same chip | |
2863 | * open drain and open source outputs are set individually | |
2864 | */ | |
02e47980 | 2865 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) { |
fac9d885 | 2866 | gpio_set_open_drain_value_commit(desc, value); |
02e47980 | 2867 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) { |
fac9d885 | 2868 | gpio_set_open_source_value_commit(desc, value); |
5f424243 RI |
2869 | } else { |
2870 | __set_bit(hwgpio, mask); | |
38e003f4 | 2871 | if (value) |
5f424243 | 2872 | __set_bit(hwgpio, bits); |
38e003f4 | 2873 | else |
5f424243 | 2874 | __clear_bit(hwgpio, bits); |
5f424243 RI |
2875 | count++; |
2876 | } | |
2877 | i++; | |
fdeb8e15 LW |
2878 | } while ((i < array_size) && |
2879 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 2880 | /* push collected bits to outputs */ |
38e003f4 | 2881 | if (count != 0) |
5f424243 | 2882 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
2883 | } |
2884 | } | |
2885 | ||
d2876d08 | 2886 | /** |
79a9becd AC |
2887 | * gpiod_set_raw_value() - assign a gpio's raw value |
2888 | * @desc: gpio whose value will be assigned | |
d2876d08 | 2889 | * @value: value to assign |
d2876d08 | 2890 | * |
79a9becd AC |
2891 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
2892 | * regard for its ACTIVE_LOW status. | |
2893 | * | |
2894 | * This function should be called from contexts where we cannot sleep, and will | |
2895 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2896 | */ |
79a9becd | 2897 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 2898 | { |
fdeb8e15 | 2899 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2900 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2901 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 2902 | gpiod_set_raw_value_commit(desc, value); |
d2876d08 | 2903 | } |
79a9becd | 2904 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
2905 | |
2906 | /** | |
79a9becd AC |
2907 | * gpiod_set_value() - assign a gpio's value |
2908 | * @desc: gpio whose value will be assigned | |
2909 | * @value: value to assign | |
2910 | * | |
02e47980 LW |
2911 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW, |
2912 | * OPEN_DRAIN and OPEN_SOURCE flags into account. | |
d2876d08 | 2913 | * |
79a9becd AC |
2914 | * This function should be called from contexts where we cannot sleep, and will |
2915 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2916 | */ |
79a9becd | 2917 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 2918 | { |
fdeb8e15 | 2919 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2920 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2921 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
2922 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2923 | value = !value; | |
02e47980 LW |
2924 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
2925 | gpio_set_open_drain_value_commit(desc, value); | |
2926 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
2927 | gpio_set_open_source_value_commit(desc, value); | |
2928 | else | |
2929 | gpiod_set_raw_value_commit(desc, value); | |
372e722e | 2930 | } |
79a9becd | 2931 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 2932 | |
5f424243 | 2933 | /** |
3fff99bc | 2934 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2935 | * @array_size: number of elements in the descriptor / value arrays |
2936 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2937 | * @value_array: array of values to assign | |
2938 | * | |
2939 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2940 | * without regard for their ACTIVE_LOW status. | |
2941 | * | |
2942 | * This function should be called from contexts where we cannot sleep, and will | |
2943 | * complain if the GPIO chip functions potentially sleep. | |
2944 | */ | |
3fff99bc | 2945 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
2946 | struct gpio_desc **desc_array, int *value_array) |
2947 | { | |
2948 | if (!desc_array) | |
2949 | return; | |
44c7288f LW |
2950 | gpiod_set_array_value_complex(true, false, array_size, desc_array, |
2951 | value_array); | |
5f424243 | 2952 | } |
3fff99bc | 2953 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
2954 | |
2955 | /** | |
3fff99bc | 2956 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2957 | * @array_size: number of elements in the descriptor / value arrays |
2958 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2959 | * @value_array: array of values to assign | |
2960 | * | |
2961 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2962 | * into account. | |
2963 | * | |
2964 | * This function should be called from contexts where we cannot sleep, and will | |
2965 | * complain if the GPIO chip functions potentially sleep. | |
2966 | */ | |
3fff99bc RI |
2967 | void gpiod_set_array_value(unsigned int array_size, |
2968 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
2969 | { |
2970 | if (!desc_array) | |
2971 | return; | |
44c7288f LW |
2972 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
2973 | value_array); | |
5f424243 | 2974 | } |
3fff99bc | 2975 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 2976 | |
d2876d08 | 2977 | /** |
79a9becd AC |
2978 | * gpiod_cansleep() - report whether gpio value access may sleep |
2979 | * @desc: gpio to check | |
d2876d08 | 2980 | * |
d2876d08 | 2981 | */ |
79a9becd | 2982 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 2983 | { |
fdeb8e15 LW |
2984 | VALIDATE_DESC(desc); |
2985 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 2986 | } |
79a9becd | 2987 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 2988 | |
0f6d504e | 2989 | /** |
79a9becd AC |
2990 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
2991 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 2992 | * |
79a9becd AC |
2993 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
2994 | * error. | |
0f6d504e | 2995 | */ |
79a9becd | 2996 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 2997 | { |
4c37ce86 LW |
2998 | struct gpio_chip *chip; |
2999 | int offset; | |
0f6d504e | 3000 | |
79bb71bd LW |
3001 | /* |
3002 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
3003 | * requires this function to not return zero on an invalid descriptor | |
3004 | * but rather a negative error number. | |
3005 | */ | |
bfbbe44d | 3006 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
3007 | return -EINVAL; |
3008 | ||
fdeb8e15 | 3009 | chip = desc->gdev->chip; |
372e722e | 3010 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
3011 | if (chip->to_irq) { |
3012 | int retirq = chip->to_irq(chip, offset); | |
3013 | ||
3014 | /* Zero means NO_IRQ */ | |
3015 | if (!retirq) | |
3016 | return -ENXIO; | |
3017 | ||
3018 | return retirq; | |
3019 | } | |
3020 | return -ENXIO; | |
0f6d504e | 3021 | } |
79a9becd | 3022 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 3023 | |
d468bf9e | 3024 | /** |
e3a2e878 | 3025 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
3026 | * @chip: the chip the GPIO to lock belongs to |
3027 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3028 | * |
3029 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 3030 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 3031 | */ |
e3a2e878 | 3032 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 3033 | { |
9c10280d LW |
3034 | struct gpio_desc *desc; |
3035 | ||
3036 | desc = gpiochip_get_desc(chip, offset); | |
3037 | if (IS_ERR(desc)) | |
3038 | return PTR_ERR(desc); | |
3039 | ||
60f8339e LW |
3040 | /* |
3041 | * If it's fast: flush the direction setting if something changed | |
3042 | * behind our back | |
3043 | */ | |
3044 | if (!chip->can_sleep && chip->get_direction) { | |
9c10280d LW |
3045 | int dir = chip->get_direction(chip, offset); |
3046 | ||
3047 | if (dir) | |
3048 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3049 | else | |
3050 | set_bit(FLAG_IS_OUT, &desc->flags); | |
3051 | } | |
d468bf9e | 3052 | |
9c10280d | 3053 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 3054 | chip_err(chip, |
d468bf9e LW |
3055 | "%s: tried to flag a GPIO set as output for IRQ\n", |
3056 | __func__); | |
3057 | return -EIO; | |
3058 | } | |
3059 | ||
9c10280d | 3060 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
3940c34a LW |
3061 | |
3062 | /* | |
3063 | * If the consumer has not set up a label (such as when the | |
3064 | * IRQ is referenced from .to_irq()) we set up a label here | |
3065 | * so it is clear this is used as an interrupt. | |
3066 | */ | |
3067 | if (!desc->label) | |
3068 | desc_set_label(desc, "interrupt"); | |
3069 | ||
d468bf9e | 3070 | return 0; |
372e722e | 3071 | } |
e3a2e878 | 3072 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 3073 | |
d468bf9e | 3074 | /** |
e3a2e878 | 3075 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
3076 | * @chip: the chip the GPIO to lock belongs to |
3077 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3078 | * |
3079 | * This is used directly by GPIO drivers that want to indicate | |
3080 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 3081 | */ |
e3a2e878 | 3082 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 3083 | { |
3940c34a LW |
3084 | struct gpio_desc *desc; |
3085 | ||
3086 | desc = gpiochip_get_desc(chip, offset); | |
3087 | if (IS_ERR(desc)) | |
d468bf9e | 3088 | return; |
d2876d08 | 3089 | |
3940c34a LW |
3090 | clear_bit(FLAG_USED_AS_IRQ, &desc->flags); |
3091 | ||
3092 | /* If we only had this marking, erase it */ | |
3093 | if (desc->label && !strcmp(desc->label, "interrupt")) | |
3094 | desc_set_label(desc, NULL); | |
d468bf9e | 3095 | } |
e3a2e878 | 3096 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 3097 | |
6cee3821 LW |
3098 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
3099 | { | |
3100 | if (offset >= chip->ngpio) | |
3101 | return false; | |
3102 | ||
3103 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
3104 | } | |
3105 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
3106 | ||
143b65d6 LW |
3107 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
3108 | { | |
3109 | if (offset >= chip->ngpio) | |
3110 | return false; | |
3111 | ||
3112 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
3113 | } | |
3114 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
3115 | ||
3116 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
3117 | { | |
3118 | if (offset >= chip->ngpio) | |
3119 | return false; | |
3120 | ||
3121 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
3122 | } | |
3123 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
3124 | ||
05f479bf CK |
3125 | bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset) |
3126 | { | |
3127 | if (offset >= chip->ngpio) | |
3128 | return false; | |
3129 | ||
2cbfca66 | 3130 | return !test_bit(FLAG_SLEEP_MAY_LOSE_VALUE, |
05f479bf CK |
3131 | &chip->gpiodev->descs[offset].flags); |
3132 | } | |
3133 | EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); | |
3134 | ||
79a9becd AC |
3135 | /** |
3136 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
3137 | * @desc: gpio whose value will be returned | |
3138 | * | |
3139 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 3140 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
3141 | * |
3142 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 3143 | */ |
79a9becd | 3144 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 3145 | { |
d2876d08 | 3146 | might_sleep_if(extra_checks); |
fdeb8e15 | 3147 | VALIDATE_DESC(desc); |
fac9d885 | 3148 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 3149 | } |
79a9becd | 3150 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 3151 | |
79a9becd AC |
3152 | /** |
3153 | * gpiod_get_value_cansleep() - return a gpio's value | |
3154 | * @desc: gpio whose value will be returned | |
3155 | * | |
3156 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 3157 | * account, or negative errno on failure. |
79a9becd AC |
3158 | * |
3159 | * This function is to be called from contexts that can sleep. | |
3160 | */ | |
3161 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 3162 | { |
3f397c21 | 3163 | int value; |
d2876d08 DB |
3164 | |
3165 | might_sleep_if(extra_checks); | |
fdeb8e15 | 3166 | VALIDATE_DESC(desc); |
fac9d885 | 3167 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
3168 | if (value < 0) |
3169 | return value; | |
3170 | ||
79a9becd AC |
3171 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
3172 | value = !value; | |
3173 | ||
3f397c21 | 3174 | return value; |
d2876d08 | 3175 | } |
79a9becd | 3176 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 3177 | |
eec1d566 LW |
3178 | /** |
3179 | * gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs | |
3180 | * @array_size: number of elements in the descriptor / value arrays | |
3181 | * @desc_array: array of GPIO descriptors whose values will be read | |
3182 | * @value_array: array to store the read values | |
3183 | * | |
3184 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
3185 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
3186 | * else an error code. | |
3187 | * | |
3188 | * This function is to be called from contexts that can sleep. | |
3189 | */ | |
3190 | int gpiod_get_raw_array_value_cansleep(unsigned int array_size, | |
3191 | struct gpio_desc **desc_array, | |
3192 | int *value_array) | |
3193 | { | |
3194 | might_sleep_if(extra_checks); | |
3195 | if (!desc_array) | |
3196 | return -EINVAL; | |
3197 | return gpiod_get_array_value_complex(true, true, array_size, | |
3198 | desc_array, value_array); | |
3199 | } | |
3200 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep); | |
3201 | ||
3202 | /** | |
3203 | * gpiod_get_array_value_cansleep() - read values from an array of GPIOs | |
3204 | * @array_size: number of elements in the descriptor / value arrays | |
3205 | * @desc_array: array of GPIO descriptors whose values will be read | |
3206 | * @value_array: array to store the read values | |
3207 | * | |
3208 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3209 | * into account. Return 0 in case of success, else an error code. | |
3210 | * | |
3211 | * This function is to be called from contexts that can sleep. | |
3212 | */ | |
3213 | int gpiod_get_array_value_cansleep(unsigned int array_size, | |
3214 | struct gpio_desc **desc_array, | |
3215 | int *value_array) | |
3216 | { | |
3217 | might_sleep_if(extra_checks); | |
3218 | if (!desc_array) | |
3219 | return -EINVAL; | |
3220 | return gpiod_get_array_value_complex(false, true, array_size, | |
3221 | desc_array, value_array); | |
3222 | } | |
3223 | EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep); | |
3224 | ||
79a9becd AC |
3225 | /** |
3226 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
3227 | * @desc: gpio whose value will be assigned | |
3228 | * @value: value to assign | |
3229 | * | |
3230 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
3231 | * regard for its ACTIVE_LOW status. | |
3232 | * | |
3233 | * This function is to be called from contexts that can sleep. | |
3234 | */ | |
3235 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 3236 | { |
d2876d08 | 3237 | might_sleep_if(extra_checks); |
fdeb8e15 | 3238 | VALIDATE_DESC_VOID(desc); |
fac9d885 | 3239 | gpiod_set_raw_value_commit(desc, value); |
372e722e | 3240 | } |
79a9becd | 3241 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 3242 | |
79a9becd AC |
3243 | /** |
3244 | * gpiod_set_value_cansleep() - assign a gpio's value | |
3245 | * @desc: gpio whose value will be assigned | |
3246 | * @value: value to assign | |
3247 | * | |
3248 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
3249 | * account | |
3250 | * | |
3251 | * This function is to be called from contexts that can sleep. | |
3252 | */ | |
3253 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 3254 | { |
d2876d08 | 3255 | might_sleep_if(extra_checks); |
fdeb8e15 | 3256 | VALIDATE_DESC_VOID(desc); |
79a9becd AC |
3257 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
3258 | value = !value; | |
fac9d885 | 3259 | gpiod_set_raw_value_commit(desc, value); |
372e722e | 3260 | } |
79a9becd | 3261 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 3262 | |
5f424243 | 3263 | /** |
3fff99bc | 3264 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
3265 | * @array_size: number of elements in the descriptor / value arrays |
3266 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
3267 | * @value_array: array of values to assign | |
3268 | * | |
3269 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
3270 | * without regard for their ACTIVE_LOW status. | |
3271 | * | |
3272 | * This function is to be called from contexts that can sleep. | |
3273 | */ | |
3fff99bc RI |
3274 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
3275 | struct gpio_desc **desc_array, | |
3276 | int *value_array) | |
5f424243 RI |
3277 | { |
3278 | might_sleep_if(extra_checks); | |
3279 | if (!desc_array) | |
3280 | return; | |
44c7288f LW |
3281 | gpiod_set_array_value_complex(true, true, array_size, desc_array, |
3282 | value_array); | |
5f424243 | 3283 | } |
3fff99bc | 3284 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 | 3285 | |
3946d187 DT |
3286 | /** |
3287 | * gpiod_add_lookup_tables() - register GPIO device consumers | |
3288 | * @tables: list of tables of consumers to register | |
3289 | * @n: number of tables in the list | |
3290 | */ | |
3291 | void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) | |
3292 | { | |
3293 | unsigned int i; | |
3294 | ||
3295 | mutex_lock(&gpio_lookup_lock); | |
3296 | ||
3297 | for (i = 0; i < n; i++) | |
3298 | list_add_tail(&tables[i]->list, &gpio_lookup_list); | |
3299 | ||
3300 | mutex_unlock(&gpio_lookup_lock); | |
3301 | } | |
3302 | ||
5f424243 | 3303 | /** |
3fff99bc | 3304 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
3305 | * @array_size: number of elements in the descriptor / value arrays |
3306 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
3307 | * @value_array: array of values to assign | |
3308 | * | |
3309 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3310 | * into account. | |
3311 | * | |
3312 | * This function is to be called from contexts that can sleep. | |
3313 | */ | |
3fff99bc RI |
3314 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
3315 | struct gpio_desc **desc_array, | |
3316 | int *value_array) | |
5f424243 RI |
3317 | { |
3318 | might_sleep_if(extra_checks); | |
3319 | if (!desc_array) | |
3320 | return; | |
44c7288f LW |
3321 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
3322 | value_array); | |
5f424243 | 3323 | } |
3fff99bc | 3324 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 3325 | |
bae48da2 | 3326 | /** |
ad824783 AC |
3327 | * gpiod_add_lookup_table() - register GPIO device consumers |
3328 | * @table: table of consumers to register | |
bae48da2 | 3329 | */ |
ad824783 | 3330 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
3331 | { |
3332 | mutex_lock(&gpio_lookup_lock); | |
3333 | ||
ad824783 | 3334 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
3335 | |
3336 | mutex_unlock(&gpio_lookup_lock); | |
3337 | } | |
226b2242 | 3338 | EXPORT_SYMBOL_GPL(gpiod_add_lookup_table); |
bae48da2 | 3339 | |
be9015ab SK |
3340 | /** |
3341 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
3342 | * @table: table of consumers to unregister | |
3343 | */ | |
3344 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
3345 | { | |
3346 | mutex_lock(&gpio_lookup_lock); | |
3347 | ||
3348 | list_del(&table->list); | |
3349 | ||
3350 | mutex_unlock(&gpio_lookup_lock); | |
3351 | } | |
226b2242 | 3352 | EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table); |
be9015ab | 3353 | |
ad824783 | 3354 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
3355 | { |
3356 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 3357 | struct gpiod_lookup_table *table; |
bae48da2 AC |
3358 | |
3359 | mutex_lock(&gpio_lookup_lock); | |
3360 | ||
ad824783 AC |
3361 | list_for_each_entry(table, &gpio_lookup_list, list) { |
3362 | if (table->dev_id && dev_id) { | |
3363 | /* | |
3364 | * Valid strings on both ends, must be identical to have | |
3365 | * a match | |
3366 | */ | |
3367 | if (!strcmp(table->dev_id, dev_id)) | |
3368 | goto found; | |
3369 | } else { | |
3370 | /* | |
3371 | * One of the pointers is NULL, so both must be to have | |
3372 | * a match | |
3373 | */ | |
3374 | if (dev_id == table->dev_id) | |
3375 | goto found; | |
3376 | } | |
3377 | } | |
3378 | table = NULL; | |
bae48da2 | 3379 | |
ad824783 AC |
3380 | found: |
3381 | mutex_unlock(&gpio_lookup_lock); | |
3382 | return table; | |
3383 | } | |
bae48da2 | 3384 | |
ad824783 AC |
3385 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
3386 | unsigned int idx, | |
3387 | enum gpio_lookup_flags *flags) | |
3388 | { | |
2a3cf6a3 | 3389 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
3390 | struct gpiod_lookup_table *table; |
3391 | struct gpiod_lookup *p; | |
bae48da2 | 3392 | |
ad824783 AC |
3393 | table = gpiod_find_lookup_table(dev); |
3394 | if (!table) | |
3395 | return desc; | |
bae48da2 | 3396 | |
ad824783 AC |
3397 | for (p = &table->table[0]; p->chip_label; p++) { |
3398 | struct gpio_chip *chip; | |
bae48da2 | 3399 | |
ad824783 | 3400 | /* idx must always match exactly */ |
bae48da2 AC |
3401 | if (p->idx != idx) |
3402 | continue; | |
3403 | ||
ad824783 AC |
3404 | /* If the lookup entry has a con_id, require exact match */ |
3405 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
3406 | continue; | |
bae48da2 | 3407 | |
ad824783 | 3408 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 3409 | |
ad824783 | 3410 | if (!chip) { |
2a3cf6a3 AC |
3411 | dev_err(dev, "cannot find GPIO chip %s\n", |
3412 | p->chip_label); | |
3413 | return ERR_PTR(-ENODEV); | |
ad824783 | 3414 | } |
bae48da2 | 3415 | |
ad824783 | 3416 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
3417 | dev_err(dev, |
3418 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
3419 | idx, chip->ngpio, chip->label); | |
3420 | return ERR_PTR(-EINVAL); | |
bae48da2 | 3421 | } |
bae48da2 | 3422 | |
bb1e88cc | 3423 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 3424 | *flags = p->flags; |
bae48da2 | 3425 | |
2a3cf6a3 | 3426 | return desc; |
bae48da2 AC |
3427 | } |
3428 | ||
bae48da2 AC |
3429 | return desc; |
3430 | } | |
3431 | ||
66858527 RI |
3432 | static int dt_gpio_count(struct device *dev, const char *con_id) |
3433 | { | |
3434 | int ret; | |
3435 | char propname[32]; | |
3436 | unsigned int i; | |
3437 | ||
3438 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
3439 | if (con_id) | |
3440 | snprintf(propname, sizeof(propname), "%s-%s", | |
3441 | con_id, gpio_suffixes[i]); | |
3442 | else | |
3443 | snprintf(propname, sizeof(propname), "%s", | |
3444 | gpio_suffixes[i]); | |
3445 | ||
3446 | ret = of_gpio_named_count(dev->of_node, propname); | |
4033d4a4 | 3447 | if (ret > 0) |
66858527 RI |
3448 | break; |
3449 | } | |
4033d4a4 | 3450 | return ret ? ret : -ENOENT; |
66858527 RI |
3451 | } |
3452 | ||
3453 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
3454 | { | |
3455 | struct gpiod_lookup_table *table; | |
3456 | struct gpiod_lookup *p; | |
3457 | unsigned int count = 0; | |
3458 | ||
3459 | table = gpiod_find_lookup_table(dev); | |
3460 | if (!table) | |
3461 | return -ENOENT; | |
3462 | ||
3463 | for (p = &table->table[0]; p->chip_label; p++) { | |
3464 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
3465 | (!con_id && !p->con_id)) | |
3466 | count++; | |
3467 | } | |
3468 | if (!count) | |
3469 | return -ENOENT; | |
3470 | ||
3471 | return count; | |
3472 | } | |
3473 | ||
3474 | /** | |
3475 | * gpiod_count - return the number of GPIOs associated with a device / function | |
3476 | * or -ENOENT if no GPIO has been assigned to the requested function | |
3477 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3478 | * @con_id: function within the GPIO consumer | |
3479 | */ | |
3480 | int gpiod_count(struct device *dev, const char *con_id) | |
3481 | { | |
3482 | int count = -ENOENT; | |
3483 | ||
3484 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
3485 | count = dt_gpio_count(dev, con_id); | |
3486 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
3487 | count = acpi_gpio_count(dev, con_id); | |
3488 | ||
3489 | if (count < 0) | |
3490 | count = platform_gpio_count(dev, con_id); | |
3491 | ||
3492 | return count; | |
3493 | } | |
3494 | EXPORT_SYMBOL_GPL(gpiod_count); | |
3495 | ||
bae48da2 | 3496 | /** |
0879162f | 3497 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 3498 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 3499 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 3500 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3501 | * |
3502 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 3503 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 3504 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 3505 | */ |
b17d1bf1 | 3506 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 3507 | enum gpiod_flags flags) |
bae48da2 | 3508 | { |
39b2bbe3 | 3509 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 3510 | } |
b17d1bf1 | 3511 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 3512 | |
29a1f233 TR |
3513 | /** |
3514 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
3515 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3516 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 3517 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3518 | * |
3519 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
3520 | * the requested function it will return NULL. This is convenient for drivers | |
3521 | * that need to handle optional GPIOs. | |
3522 | */ | |
b17d1bf1 | 3523 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
3524 | const char *con_id, |
3525 | enum gpiod_flags flags) | |
29a1f233 | 3526 | { |
39b2bbe3 | 3527 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 3528 | } |
b17d1bf1 | 3529 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 3530 | |
f625d460 BP |
3531 | |
3532 | /** | |
3533 | * gpiod_configure_flags - helper function to configure a given GPIO | |
3534 | * @desc: gpio whose value will be assigned | |
3535 | * @con_id: function within the GPIO consumer | |
85b03b30 JH |
3536 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
3537 | * of_get_gpio_hog() | |
f625d460 BP |
3538 | * @dflags: gpiod_flags - optional GPIO initialization flags |
3539 | * | |
3540 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
3541 | * requested function and/or index, or another IS_ERR() code if an error | |
3542 | * occurred while trying to acquire the GPIO. | |
3543 | */ | |
c29fd9eb | 3544 | int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, |
85b03b30 | 3545 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
3546 | { |
3547 | int status; | |
3548 | ||
85b03b30 JH |
3549 | if (lflags & GPIO_ACTIVE_LOW) |
3550 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
3551 | if (lflags & GPIO_OPEN_DRAIN) | |
3552 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
3553 | if (lflags & GPIO_OPEN_SOURCE) | |
3554 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2cbfca66 AJ |
3555 | if (lflags & GPIO_SLEEP_MAY_LOSE_VALUE) |
3556 | set_bit(FLAG_SLEEP_MAY_LOSE_VALUE, &desc->flags); | |
85b03b30 | 3557 | |
f625d460 BP |
3558 | /* No particular flag request, return here... */ |
3559 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
3560 | pr_debug("no flags found for %s\n", con_id); | |
3561 | return 0; | |
3562 | } | |
3563 | ||
3564 | /* Process flags */ | |
3565 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
3566 | status = gpiod_direction_output(desc, | |
ad17731d | 3567 | !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL)); |
f625d460 BP |
3568 | else |
3569 | status = gpiod_direction_input(desc); | |
3570 | ||
3571 | return status; | |
3572 | } | |
3573 | ||
bae48da2 AC |
3574 | /** |
3575 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 3576 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
3577 | * @con_id: function within the GPIO consumer |
3578 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3579 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3580 | * |
3581 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
3582 | * defined one for functions that define several GPIOs. | |
3583 | * | |
2a3cf6a3 AC |
3584 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
3585 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 3586 | * occurred while trying to acquire the GPIO. |
bae48da2 | 3587 | */ |
b17d1bf1 | 3588 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 3589 | const char *con_id, |
39b2bbe3 AC |
3590 | unsigned int idx, |
3591 | enum gpiod_flags flags) | |
bae48da2 | 3592 | { |
35c5d7fd | 3593 | struct gpio_desc *desc = NULL; |
bae48da2 | 3594 | int status; |
39b2bbe3 | 3595 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
3596 | |
3597 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
3598 | ||
4d8440b9 RW |
3599 | if (dev) { |
3600 | /* Using device tree? */ | |
3601 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
3602 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
3603 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
3604 | } else if (ACPI_COMPANION(dev)) { | |
3605 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
a31f5c3a | 3606 | desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); |
4d8440b9 | 3607 | } |
35c5d7fd AC |
3608 | } |
3609 | ||
3610 | /* | |
3611 | * Either we are not using DT or ACPI, or their lookup did not return | |
3612 | * a result. In that case, use platform lookup as a fallback. | |
3613 | */ | |
2a3cf6a3 | 3614 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 3615 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 3616 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
3617 | } |
3618 | ||
3619 | if (IS_ERR(desc)) { | |
351cfe0f | 3620 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
3621 | return desc; |
3622 | } | |
3623 | ||
3624 | status = gpiod_request(desc, con_id); | |
bae48da2 AC |
3625 | if (status < 0) |
3626 | return ERR_PTR(status); | |
3627 | ||
85b03b30 | 3628 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
3629 | if (status < 0) { |
3630 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
3631 | gpiod_put(desc); | |
3632 | return ERR_PTR(status); | |
3633 | } | |
3634 | ||
bae48da2 AC |
3635 | return desc; |
3636 | } | |
b17d1bf1 | 3637 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 3638 | |
40b73183 MW |
3639 | /** |
3640 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
3641 | * @fwnode: handle of the firmware node | |
3642 | * @propname: name of the firmware property representing the GPIO | |
537b94da | 3643 | * @index: index of the GPIO to obtain in the consumer |
a264d10f | 3644 | * @dflags: GPIO initialization flags |
950d55f5 | 3645 | * @label: label to attach to the requested GPIO |
40b73183 MW |
3646 | * |
3647 | * This function can be used for drivers that get their configuration | |
3648 | * from firmware. | |
3649 | * | |
3650 | * Function properly finds the corresponding GPIO using whatever is the | |
3651 | * underlying firmware interface and then makes sure that the GPIO | |
3652 | * descriptor is requested before it is returned to the caller. | |
3653 | * | |
950d55f5 | 3654 | * Returns: |
ff21378a | 3655 | * On successful request the GPIO pin is configured in accordance with |
a264d10f AS |
3656 | * provided @dflags. |
3657 | * | |
40b73183 MW |
3658 | * In case of error an ERR_PTR() is returned. |
3659 | */ | |
3660 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
537b94da | 3661 | const char *propname, int index, |
b2987d74 AS |
3662 | enum gpiod_flags dflags, |
3663 | const char *label) | |
40b73183 MW |
3664 | { |
3665 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
a264d10f | 3666 | unsigned long lflags = 0; |
40b73183 | 3667 | bool active_low = false; |
90b665f6 | 3668 | bool single_ended = false; |
4c0facdd | 3669 | bool open_drain = false; |
40b73183 MW |
3670 | int ret; |
3671 | ||
3672 | if (!fwnode) | |
3673 | return ERR_PTR(-EINVAL); | |
3674 | ||
3675 | if (is_of_node(fwnode)) { | |
3676 | enum of_gpio_flags flags; | |
3677 | ||
537b94da BB |
3678 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, |
3679 | index, &flags); | |
90b665f6 | 3680 | if (!IS_ERR(desc)) { |
40b73183 | 3681 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 | 3682 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
4c0facdd | 3683 | open_drain = flags & OF_GPIO_OPEN_DRAIN; |
90b665f6 | 3684 | } |
40b73183 MW |
3685 | } else if (is_acpi_node(fwnode)) { |
3686 | struct acpi_gpio_info info; | |
3687 | ||
537b94da | 3688 | desc = acpi_node_get_gpiod(fwnode, propname, index, &info); |
a31f5c3a | 3689 | if (!IS_ERR(desc)) { |
52044723 | 3690 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
a31f5c3a AS |
3691 | ret = acpi_gpio_update_gpiod_flags(&dflags, info.flags); |
3692 | if (ret) | |
3693 | pr_debug("Override GPIO initialization flags\n"); | |
3694 | } | |
40b73183 MW |
3695 | } |
3696 | ||
3697 | if (IS_ERR(desc)) | |
3698 | return desc; | |
3699 | ||
b2987d74 | 3700 | ret = gpiod_request(desc, label); |
85b03b30 JH |
3701 | if (ret) |
3702 | return ERR_PTR(ret); | |
3703 | ||
40b73183 | 3704 | if (active_low) |
a264d10f | 3705 | lflags |= GPIO_ACTIVE_LOW; |
40b73183 | 3706 | |
90b665f6 | 3707 | if (single_ended) { |
4c0facdd | 3708 | if (open_drain) |
a264d10f | 3709 | lflags |= GPIO_OPEN_DRAIN; |
90b665f6 | 3710 | else |
a264d10f AS |
3711 | lflags |= GPIO_OPEN_SOURCE; |
3712 | } | |
3713 | ||
3714 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); | |
3715 | if (ret < 0) { | |
3716 | gpiod_put(desc); | |
3717 | return ERR_PTR(ret); | |
90b665f6 LP |
3718 | } |
3719 | ||
40b73183 MW |
3720 | return desc; |
3721 | } | |
3722 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
3723 | ||
29a1f233 TR |
3724 | /** |
3725 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
3726 | * function | |
3727 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3728 | * @con_id: function within the GPIO consumer | |
3729 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3730 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3731 | * |
3732 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
3733 | * specified index was assigned to the requested function it will return NULL. | |
3734 | * This is convenient for drivers that need to handle optional GPIOs. | |
3735 | */ | |
b17d1bf1 | 3736 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 3737 | const char *con_id, |
39b2bbe3 AC |
3738 | unsigned int index, |
3739 | enum gpiod_flags flags) | |
29a1f233 TR |
3740 | { |
3741 | struct gpio_desc *desc; | |
3742 | ||
39b2bbe3 | 3743 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
3744 | if (IS_ERR(desc)) { |
3745 | if (PTR_ERR(desc) == -ENOENT) | |
3746 | return NULL; | |
3747 | } | |
3748 | ||
3749 | return desc; | |
3750 | } | |
b17d1bf1 | 3751 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 3752 | |
f625d460 BP |
3753 | /** |
3754 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
3755 | * @desc: gpio whose value will be assigned | |
3756 | * @name: gpio line name | |
3757 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
3758 | * of_get_gpio_hog() | |
3759 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
3760 | */ | |
3761 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
3762 | unsigned long lflags, enum gpiod_flags dflags) | |
3763 | { | |
3764 | struct gpio_chip *chip; | |
3765 | struct gpio_desc *local_desc; | |
3766 | int hwnum; | |
3767 | int status; | |
3768 | ||
3769 | chip = gpiod_to_chip(desc); | |
3770 | hwnum = gpio_chip_hwgpio(desc); | |
3771 | ||
3772 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); | |
3773 | if (IS_ERR(local_desc)) { | |
c31a571d LD |
3774 | status = PTR_ERR(local_desc); |
3775 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
3776 | name, chip->label, hwnum, status); | |
3777 | return status; | |
f625d460 BP |
3778 | } |
3779 | ||
85b03b30 | 3780 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
f625d460 | 3781 | if (status < 0) { |
c31a571d LD |
3782 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
3783 | name, chip->label, hwnum, status); | |
f625d460 BP |
3784 | gpiochip_free_own_desc(desc); |
3785 | return status; | |
3786 | } | |
3787 | ||
3788 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
3789 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
3790 | ||
3791 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
3792 | desc_to_gpio(desc), name, | |
3793 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
3794 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
3795 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
3796 | ||
3797 | return 0; | |
3798 | } | |
3799 | ||
3800 | /** | |
3801 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
3802 | * @chip: gpio chip to act on | |
3803 | * | |
3804 | * This is only used by of_gpiochip_remove to free hogged gpios | |
3805 | */ | |
3806 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
3807 | { | |
3808 | int id; | |
3809 | ||
3810 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
3811 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
3812 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
3813 | } |
3814 | } | |
3815 | ||
66858527 RI |
3816 | /** |
3817 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
3818 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3819 | * @con_id: function within the GPIO consumer | |
3820 | * @flags: optional GPIO initialization flags | |
3821 | * | |
3822 | * This function acquires all the GPIOs defined under a given function. | |
3823 | * | |
3824 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
3825 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
3826 | * code if an error occurred while trying to acquire the GPIOs. | |
3827 | */ | |
3828 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
3829 | const char *con_id, | |
3830 | enum gpiod_flags flags) | |
3831 | { | |
3832 | struct gpio_desc *desc; | |
3833 | struct gpio_descs *descs; | |
3834 | int count; | |
3835 | ||
3836 | count = gpiod_count(dev, con_id); | |
3837 | if (count < 0) | |
3838 | return ERR_PTR(count); | |
3839 | ||
3840 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
3841 | GFP_KERNEL); | |
3842 | if (!descs) | |
3843 | return ERR_PTR(-ENOMEM); | |
3844 | ||
3845 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
3846 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
3847 | if (IS_ERR(desc)) { | |
3848 | gpiod_put_array(descs); | |
3849 | return ERR_CAST(desc); | |
3850 | } | |
3851 | descs->desc[descs->ndescs] = desc; | |
3852 | descs->ndescs++; | |
3853 | } | |
3854 | return descs; | |
3855 | } | |
3856 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
3857 | ||
3858 | /** | |
3859 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
3860 | * function | |
3861 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3862 | * @con_id: function within the GPIO consumer | |
3863 | * @flags: optional GPIO initialization flags | |
3864 | * | |
3865 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
3866 | * assigned to the requested function it will return NULL. | |
3867 | */ | |
3868 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
3869 | const char *con_id, | |
3870 | enum gpiod_flags flags) | |
3871 | { | |
3872 | struct gpio_descs *descs; | |
3873 | ||
3874 | descs = gpiod_get_array(dev, con_id, flags); | |
3875 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
3876 | return NULL; | |
3877 | ||
3878 | return descs; | |
3879 | } | |
3880 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
3881 | ||
bae48da2 AC |
3882 | /** |
3883 | * gpiod_put - dispose of a GPIO descriptor | |
3884 | * @desc: GPIO descriptor to dispose of | |
3885 | * | |
3886 | * No descriptor can be used after gpiod_put() has been called on it. | |
3887 | */ | |
3888 | void gpiod_put(struct gpio_desc *desc) | |
3889 | { | |
3890 | gpiod_free(desc); | |
372e722e | 3891 | } |
bae48da2 | 3892 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 3893 | |
66858527 RI |
3894 | /** |
3895 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
3896 | * @descs: struct gpio_descs containing an array of descriptors | |
3897 | */ | |
3898 | void gpiod_put_array(struct gpio_descs *descs) | |
3899 | { | |
3900 | unsigned int i; | |
3901 | ||
3902 | for (i = 0; i < descs->ndescs; i++) | |
3903 | gpiod_put(descs->desc[i]); | |
3904 | ||
3905 | kfree(descs); | |
3906 | } | |
3907 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
3908 | ||
3c702e99 LW |
3909 | static int __init gpiolib_dev_init(void) |
3910 | { | |
3911 | int ret; | |
3912 | ||
3913 | /* Register GPIO sysfs bus */ | |
3914 | ret = bus_register(&gpio_bus_type); | |
3915 | if (ret < 0) { | |
3916 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
3917 | return ret; | |
3918 | } | |
3919 | ||
3920 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
3921 | if (ret < 0) { | |
3922 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
3923 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
3924 | } else { |
3925 | gpiolib_initialized = true; | |
3926 | gpiochip_setup_devs(); | |
3c702e99 LW |
3927 | } |
3928 | return ret; | |
3929 | } | |
3930 | core_initcall(gpiolib_dev_init); | |
3931 | ||
d2876d08 DB |
3932 | #ifdef CONFIG_DEBUG_FS |
3933 | ||
fdeb8e15 | 3934 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
3935 | { |
3936 | unsigned i; | |
fdeb8e15 LW |
3937 | struct gpio_chip *chip = gdev->chip; |
3938 | unsigned gpio = gdev->base; | |
3939 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 3940 | int is_out; |
d468bf9e | 3941 | int is_irq; |
d2876d08 | 3942 | |
fdeb8e15 | 3943 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
3944 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
3945 | if (gdesc->name) { | |
3946 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
3947 | gpio, gdesc->name); | |
3948 | } | |
d2876d08 | 3949 | continue; |
ced433e2 | 3950 | } |
d2876d08 | 3951 | |
372e722e | 3952 | gpiod_get_direction(gdesc); |
d2876d08 | 3953 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 3954 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
3955 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
3956 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
3957 | is_out ? "out" : "in ", |
3958 | chip->get | |
3959 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
3960 | : "? ", |
3961 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
3962 | seq_printf(s, "\n"); |
3963 | } | |
3964 | } | |
3965 | ||
f9c4a31f | 3966 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 3967 | { |
362432ae | 3968 | unsigned long flags; |
ff2b1359 | 3969 | struct gpio_device *gdev = NULL; |
cb1650d4 | 3970 | loff_t index = *pos; |
d2876d08 | 3971 | |
f9c4a31f | 3972 | s->private = ""; |
d2876d08 | 3973 | |
362432ae | 3974 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3975 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
3976 | if (index-- == 0) { |
3977 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 3978 | return gdev; |
f9c4a31f | 3979 | } |
362432ae | 3980 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 3981 | |
cb1650d4 | 3982 | return NULL; |
f9c4a31f TR |
3983 | } |
3984 | ||
3985 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
3986 | { | |
362432ae | 3987 | unsigned long flags; |
ff2b1359 | 3988 | struct gpio_device *gdev = v; |
f9c4a31f TR |
3989 | void *ret = NULL; |
3990 | ||
362432ae | 3991 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3992 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
3993 | ret = NULL; |
3994 | else | |
ff2b1359 | 3995 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 3996 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
3997 | |
3998 | s->private = "\n"; | |
3999 | ++*pos; | |
4000 | ||
4001 | return ret; | |
4002 | } | |
4003 | ||
4004 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
4005 | { | |
4006 | } | |
4007 | ||
4008 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
4009 | { | |
ff2b1359 LW |
4010 | struct gpio_device *gdev = v; |
4011 | struct gpio_chip *chip = gdev->chip; | |
4012 | struct device *parent; | |
4013 | ||
4014 | if (!chip) { | |
4015 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
4016 | dev_name(&gdev->dev)); | |
4017 | return 0; | |
4018 | } | |
f9c4a31f | 4019 | |
ff2b1359 LW |
4020 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
4021 | dev_name(&gdev->dev), | |
fdeb8e15 | 4022 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
4023 | parent = chip->parent; |
4024 | if (parent) | |
4025 | seq_printf(s, ", parent: %s/%s", | |
4026 | parent->bus ? parent->bus->name : "no-bus", | |
4027 | dev_name(parent)); | |
f9c4a31f TR |
4028 | if (chip->label) |
4029 | seq_printf(s, ", %s", chip->label); | |
4030 | if (chip->can_sleep) | |
4031 | seq_printf(s, ", can sleep"); | |
4032 | seq_printf(s, ":\n"); | |
4033 | ||
4034 | if (chip->dbg_show) | |
4035 | chip->dbg_show(s, chip); | |
4036 | else | |
fdeb8e15 | 4037 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 4038 | |
d2876d08 DB |
4039 | return 0; |
4040 | } | |
4041 | ||
f9c4a31f TR |
4042 | static const struct seq_operations gpiolib_seq_ops = { |
4043 | .start = gpiolib_seq_start, | |
4044 | .next = gpiolib_seq_next, | |
4045 | .stop = gpiolib_seq_stop, | |
4046 | .show = gpiolib_seq_show, | |
4047 | }; | |
4048 | ||
d2876d08 DB |
4049 | static int gpiolib_open(struct inode *inode, struct file *file) |
4050 | { | |
f9c4a31f | 4051 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
4052 | } |
4053 | ||
828c0950 | 4054 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 4055 | .owner = THIS_MODULE, |
d2876d08 DB |
4056 | .open = gpiolib_open, |
4057 | .read = seq_read, | |
4058 | .llseek = seq_lseek, | |
f9c4a31f | 4059 | .release = seq_release, |
d2876d08 DB |
4060 | }; |
4061 | ||
4062 | static int __init gpiolib_debugfs_init(void) | |
4063 | { | |
4064 | /* /sys/kernel/debug/gpio */ | |
4065 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
4066 | NULL, NULL, &gpiolib_operations); | |
4067 | return 0; | |
4068 | } | |
4069 | subsys_initcall(gpiolib_debugfs_init); | |
4070 | ||
4071 | #endif /* DEBUG_FS */ |