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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); | |
75 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); | |
79b804cb MW |
76 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip); |
77 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip); | |
6d86750c | 78 | |
159f3cd9 | 79 | static bool gpiolib_initialized; |
6d86750c | 80 | |
d2876d08 DB |
81 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
82 | { | |
d2876d08 | 83 | d->label = label; |
d2876d08 DB |
84 | } |
85 | ||
372e722e | 86 | /** |
950d55f5 TR |
87 | * gpio_to_desc - Convert a GPIO number to its descriptor |
88 | * @gpio: global GPIO number | |
89 | * | |
90 | * Returns: | |
91 | * The GPIO descriptor associated with the given GPIO, or %NULL if no GPIO | |
92 | * with the given number exists in the system. | |
372e722e | 93 | */ |
79a9becd | 94 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 95 | { |
ff2b1359 | 96 | struct gpio_device *gdev; |
14e85c0e AC |
97 | unsigned long flags; |
98 | ||
99 | spin_lock_irqsave(&gpio_lock, flags); | |
100 | ||
ff2b1359 | 101 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
102 | if (gdev->base <= gpio && |
103 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 104 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 105 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
106 | } |
107 | } | |
108 | ||
109 | spin_unlock_irqrestore(&gpio_lock, flags); | |
110 | ||
0e9a5edf AC |
111 | if (!gpio_is_valid(gpio)) |
112 | WARN(1, "invalid GPIO %d\n", gpio); | |
113 | ||
14e85c0e | 114 | return NULL; |
372e722e | 115 | } |
79a9becd | 116 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 117 | |
d468bf9e | 118 | /** |
950d55f5 TR |
119 | * gpiochip_get_desc - get the GPIO descriptor corresponding to the given |
120 | * hardware number for this chip | |
121 | * @chip: GPIO chip | |
122 | * @hwnum: hardware number of the GPIO for this chip | |
123 | * | |
124 | * Returns: | |
125 | * A pointer to the GPIO descriptor or %ERR_PTR(-EINVAL) if no GPIO exists | |
126 | * in the given chip for the specified hardware number. | |
d468bf9e | 127 | */ |
bb1e88cc AC |
128 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
129 | u16 hwnum) | |
d468bf9e | 130 | { |
fdeb8e15 LW |
131 | struct gpio_device *gdev = chip->gpiodev; |
132 | ||
133 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 134 | return ERR_PTR(-EINVAL); |
d468bf9e | 135 | |
fdeb8e15 | 136 | return &gdev->descs[hwnum]; |
d468bf9e | 137 | } |
372e722e AC |
138 | |
139 | /** | |
950d55f5 TR |
140 | * desc_to_gpio - convert a GPIO descriptor to the integer namespace |
141 | * @desc: GPIO descriptor | |
142 | * | |
372e722e | 143 | * This should disappear in the future but is needed since we still |
950d55f5 TR |
144 | * use GPIO numbers for error messages and sysfs nodes. |
145 | * | |
146 | * Returns: | |
147 | * The global GPIO number for the GPIO specified by its descriptor. | |
372e722e | 148 | */ |
79a9becd | 149 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 150 | { |
fdeb8e15 | 151 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 152 | } |
79a9becd | 153 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
154 | |
155 | ||
79a9becd AC |
156 | /** |
157 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
158 | * @desc: descriptor to return the chip of | |
159 | */ | |
160 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 161 | { |
fdeb8e15 LW |
162 | if (!desc || !desc->gdev || !desc->gdev->chip) |
163 | return NULL; | |
164 | return desc->gdev->chip; | |
372e722e | 165 | } |
79a9becd | 166 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 167 | |
8d0aab2f AV |
168 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
169 | static int gpiochip_find_base(int ngpio) | |
170 | { | |
ff2b1359 | 171 | struct gpio_device *gdev; |
83cabe33 | 172 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 173 | |
ff2b1359 | 174 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 175 | /* found a free space? */ |
fdeb8e15 | 176 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
177 | break; |
178 | else | |
179 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 180 | base = gdev->base - ngpio; |
8d0aab2f AV |
181 | } |
182 | ||
83cabe33 | 183 | if (gpio_is_valid(base)) { |
8d0aab2f | 184 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
185 | return base; |
186 | } else { | |
187 | pr_err("%s: cannot find free range\n", __func__); | |
188 | return -ENOSPC; | |
169b6a7a | 189 | } |
169b6a7a AV |
190 | } |
191 | ||
79a9becd AC |
192 | /** |
193 | * gpiod_get_direction - return the current direction of a GPIO | |
194 | * @desc: GPIO to get the direction of | |
195 | * | |
196 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
197 | * | |
198 | * This function may sleep if gpiod_cansleep() is true. | |
199 | */ | |
8e53b0f1 | 200 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
201 | { |
202 | struct gpio_chip *chip; | |
372e722e | 203 | unsigned offset; |
80b0a602 MN |
204 | int status = -EINVAL; |
205 | ||
372e722e AC |
206 | chip = gpiod_to_chip(desc); |
207 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
208 | |
209 | if (!chip->get_direction) | |
210 | return status; | |
211 | ||
372e722e | 212 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
213 | if (status > 0) { |
214 | /* GPIOF_DIR_IN, or other positive */ | |
215 | status = 1; | |
8e53b0f1 | 216 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
217 | } |
218 | if (status == 0) { | |
219 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 220 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
221 | } |
222 | return status; | |
223 | } | |
79a9becd | 224 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 225 | |
1a989d0f AC |
226 | /* |
227 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 228 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
229 | * |
230 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
231 | * space. | |
232 | */ | |
ff2b1359 | 233 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 234 | { |
a961f9b4 | 235 | struct gpio_device *prev, *next; |
1a989d0f | 236 | |
ff2b1359 | 237 | if (list_empty(&gpio_devices)) { |
a961f9b4 | 238 | /* initial entry in list */ |
ff2b1359 | 239 | list_add_tail(&gdev->list, &gpio_devices); |
e28ecca6 | 240 | return 0; |
1a989d0f AC |
241 | } |
242 | ||
a961f9b4 BJZ |
243 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
244 | if (gdev->base + gdev->ngpio <= next->base) { | |
245 | /* add before first entry */ | |
246 | list_add(&gdev->list, &gpio_devices); | |
247 | return 0; | |
1a989d0f AC |
248 | } |
249 | ||
a961f9b4 BJZ |
250 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
251 | if (prev->base + prev->ngpio <= gdev->base) { | |
252 | /* add behind last entry */ | |
253 | list_add_tail(&gdev->list, &gpio_devices); | |
96098df1 | 254 | return 0; |
1a989d0f AC |
255 | } |
256 | ||
a961f9b4 BJZ |
257 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
258 | /* at the end of the list */ | |
259 | if (&next->list == &gpio_devices) | |
260 | break; | |
1a989d0f | 261 | |
a961f9b4 BJZ |
262 | /* add between prev and next */ |
263 | if (prev->base + prev->ngpio <= gdev->base | |
264 | && gdev->base + gdev->ngpio <= next->base) { | |
265 | list_add(&gdev->list, &prev->list); | |
266 | return 0; | |
267 | } | |
268 | } | |
269 | ||
270 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); | |
271 | return -EBUSY; | |
1a989d0f AC |
272 | } |
273 | ||
950d55f5 | 274 | /* |
f881bab0 LW |
275 | * Convert a GPIO name to its descriptor |
276 | */ | |
277 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
278 | { | |
ff2b1359 | 279 | struct gpio_device *gdev; |
f881bab0 LW |
280 | unsigned long flags; |
281 | ||
282 | spin_lock_irqsave(&gpio_lock, flags); | |
283 | ||
ff2b1359 | 284 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
285 | int i; |
286 | ||
fdeb8e15 LW |
287 | for (i = 0; i != gdev->ngpio; ++i) { |
288 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 289 | |
fdeb8e15 | 290 | if (!desc->name || !name) |
f881bab0 LW |
291 | continue; |
292 | ||
fdeb8e15 | 293 | if (!strcmp(desc->name, name)) { |
f881bab0 | 294 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 295 | return desc; |
f881bab0 LW |
296 | } |
297 | } | |
298 | } | |
299 | ||
300 | spin_unlock_irqrestore(&gpio_lock, flags); | |
301 | ||
302 | return NULL; | |
303 | } | |
304 | ||
5f3ca732 MP |
305 | /* |
306 | * Takes the names from gc->names and checks if they are all unique. If they | |
307 | * are, they are assigned to their gpio descriptors. | |
308 | * | |
ed37915c | 309 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
310 | */ |
311 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
312 | { | |
fdeb8e15 | 313 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
314 | int i; |
315 | ||
316 | if (!gc->names) | |
317 | return 0; | |
318 | ||
319 | /* First check all names if they are unique */ | |
320 | for (i = 0; i != gc->ngpio; ++i) { | |
321 | struct gpio_desc *gpio; | |
322 | ||
323 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 324 | if (gpio) |
fdeb8e15 | 325 | dev_warn(&gdev->dev, |
34ffd85d | 326 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 327 | gc->names[i]); |
5f3ca732 MP |
328 | } |
329 | ||
330 | /* Then add all names to the GPIO descriptors */ | |
331 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 332 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
333 | |
334 | return 0; | |
335 | } | |
336 | ||
d7c51b47 LW |
337 | /* |
338 | * GPIO line handle management | |
339 | */ | |
340 | ||
341 | /** | |
342 | * struct linehandle_state - contains the state of a userspace handle | |
343 | * @gdev: the GPIO device the handle pertains to | |
344 | * @label: consumer label used to tag descriptors | |
345 | * @descs: the GPIO descriptors held by this handle | |
346 | * @numdescs: the number of descriptors held in the descs array | |
347 | */ | |
348 | struct linehandle_state { | |
349 | struct gpio_device *gdev; | |
350 | const char *label; | |
351 | struct gpio_desc *descs[GPIOHANDLES_MAX]; | |
352 | u32 numdescs; | |
353 | }; | |
354 | ||
e3e847c7 LPC |
355 | #define GPIOHANDLE_REQUEST_VALID_FLAGS \ |
356 | (GPIOHANDLE_REQUEST_INPUT | \ | |
357 | GPIOHANDLE_REQUEST_OUTPUT | \ | |
358 | GPIOHANDLE_REQUEST_ACTIVE_LOW | \ | |
359 | GPIOHANDLE_REQUEST_OPEN_DRAIN | \ | |
360 | GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
361 | ||
d7c51b47 LW |
362 | static long linehandle_ioctl(struct file *filep, unsigned int cmd, |
363 | unsigned long arg) | |
364 | { | |
365 | struct linehandle_state *lh = filep->private_data; | |
366 | void __user *ip = (void __user *)arg; | |
367 | struct gpiohandle_data ghd; | |
368 | int i; | |
369 | ||
370 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
371 | int val; | |
372 | ||
3eded5d8 LPC |
373 | memset(&ghd, 0, sizeof(ghd)); |
374 | ||
d7c51b47 LW |
375 | /* TODO: check if descriptors are really input */ |
376 | for (i = 0; i < lh->numdescs; i++) { | |
377 | val = gpiod_get_value_cansleep(lh->descs[i]); | |
378 | if (val < 0) | |
379 | return val; | |
380 | ghd.values[i] = val; | |
381 | } | |
382 | ||
383 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
384 | return -EFAULT; | |
385 | ||
386 | return 0; | |
387 | } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) { | |
388 | int vals[GPIOHANDLES_MAX]; | |
389 | ||
390 | /* TODO: check if descriptors are really output */ | |
391 | if (copy_from_user(&ghd, ip, sizeof(ghd))) | |
392 | return -EFAULT; | |
393 | ||
394 | /* Clamp all values to [0,1] */ | |
395 | for (i = 0; i < lh->numdescs; i++) | |
396 | vals[i] = !!ghd.values[i]; | |
397 | ||
398 | /* Reuse the array setting function */ | |
399 | gpiod_set_array_value_complex(false, | |
400 | true, | |
401 | lh->numdescs, | |
402 | lh->descs, | |
403 | vals); | |
404 | return 0; | |
405 | } | |
406 | return -EINVAL; | |
407 | } | |
408 | ||
409 | #ifdef CONFIG_COMPAT | |
410 | static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd, | |
411 | unsigned long arg) | |
412 | { | |
413 | return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
414 | } | |
415 | #endif | |
416 | ||
417 | static int linehandle_release(struct inode *inode, struct file *filep) | |
418 | { | |
419 | struct linehandle_state *lh = filep->private_data; | |
420 | struct gpio_device *gdev = lh->gdev; | |
421 | int i; | |
422 | ||
423 | for (i = 0; i < lh->numdescs; i++) | |
424 | gpiod_free(lh->descs[i]); | |
425 | kfree(lh->label); | |
426 | kfree(lh); | |
427 | put_device(&gdev->dev); | |
428 | return 0; | |
429 | } | |
430 | ||
431 | static const struct file_operations linehandle_fileops = { | |
432 | .release = linehandle_release, | |
433 | .owner = THIS_MODULE, | |
434 | .llseek = noop_llseek, | |
435 | .unlocked_ioctl = linehandle_ioctl, | |
436 | #ifdef CONFIG_COMPAT | |
437 | .compat_ioctl = linehandle_ioctl_compat, | |
438 | #endif | |
439 | }; | |
440 | ||
441 | static int linehandle_create(struct gpio_device *gdev, void __user *ip) | |
442 | { | |
443 | struct gpiohandle_request handlereq; | |
444 | struct linehandle_state *lh; | |
953b956a | 445 | struct file *file; |
d7c51b47 LW |
446 | int fd, i, ret; |
447 | ||
448 | if (copy_from_user(&handlereq, ip, sizeof(handlereq))) | |
449 | return -EFAULT; | |
450 | if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX)) | |
451 | return -EINVAL; | |
452 | ||
453 | lh = kzalloc(sizeof(*lh), GFP_KERNEL); | |
454 | if (!lh) | |
455 | return -ENOMEM; | |
456 | lh->gdev = gdev; | |
457 | get_device(&gdev->dev); | |
458 | ||
459 | /* Make sure this is terminated */ | |
460 | handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0'; | |
461 | if (strlen(handlereq.consumer_label)) { | |
462 | lh->label = kstrdup(handlereq.consumer_label, | |
463 | GFP_KERNEL); | |
464 | if (!lh->label) { | |
465 | ret = -ENOMEM; | |
466 | goto out_free_lh; | |
467 | } | |
468 | } | |
469 | ||
470 | /* Request each GPIO */ | |
471 | for (i = 0; i < handlereq.lines; i++) { | |
472 | u32 offset = handlereq.lineoffsets[i]; | |
473 | u32 lflags = handlereq.flags; | |
474 | struct gpio_desc *desc; | |
475 | ||
e405f9fc LPC |
476 | if (offset >= gdev->ngpio) { |
477 | ret = -EINVAL; | |
478 | goto out_free_descs; | |
479 | } | |
480 | ||
e3e847c7 LPC |
481 | /* Return an error if a unknown flag is set */ |
482 | if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) { | |
483 | ret = -EINVAL; | |
484 | goto out_free_descs; | |
485 | } | |
486 | ||
d7c51b47 LW |
487 | desc = &gdev->descs[offset]; |
488 | ret = gpiod_request(desc, lh->label); | |
489 | if (ret) | |
490 | goto out_free_descs; | |
491 | lh->descs[i] = desc; | |
492 | ||
493 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
494 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
495 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
496 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
497 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
498 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
499 | ||
500 | /* | |
501 | * Lines have to be requested explicitly for input | |
502 | * or output, else the line will be treated "as is". | |
503 | */ | |
504 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
505 | int val = !!handlereq.default_values[i]; | |
506 | ||
507 | ret = gpiod_direction_output(desc, val); | |
508 | if (ret) | |
509 | goto out_free_descs; | |
510 | } else if (lflags & GPIOHANDLE_REQUEST_INPUT) { | |
511 | ret = gpiod_direction_input(desc); | |
512 | if (ret) | |
513 | goto out_free_descs; | |
514 | } | |
515 | dev_dbg(&gdev->dev, "registered chardev handle for line %d\n", | |
516 | offset); | |
517 | } | |
e2f608be LW |
518 | /* Let i point at the last handle */ |
519 | i--; | |
d7c51b47 LW |
520 | lh->numdescs = handlereq.lines; |
521 | ||
953b956a | 522 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
d7c51b47 LW |
523 | if (fd < 0) { |
524 | ret = fd; | |
525 | goto out_free_descs; | |
526 | } | |
527 | ||
953b956a LPC |
528 | file = anon_inode_getfile("gpio-linehandle", |
529 | &linehandle_fileops, | |
530 | lh, | |
531 | O_RDONLY | O_CLOEXEC); | |
532 | if (IS_ERR(file)) { | |
533 | ret = PTR_ERR(file); | |
534 | goto out_put_unused_fd; | |
535 | } | |
536 | ||
d7c51b47 | 537 | handlereq.fd = fd; |
d932cd49 | 538 | if (copy_to_user(ip, &handlereq, sizeof(handlereq))) { |
953b956a LPC |
539 | /* |
540 | * fput() will trigger the release() callback, so do not go onto | |
541 | * the regular error cleanup path here. | |
542 | */ | |
543 | fput(file); | |
544 | put_unused_fd(fd); | |
545 | return -EFAULT; | |
d932cd49 | 546 | } |
d7c51b47 | 547 | |
953b956a LPC |
548 | fd_install(fd, file); |
549 | ||
d7c51b47 LW |
550 | dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n", |
551 | lh->numdescs); | |
552 | ||
553 | return 0; | |
554 | ||
953b956a LPC |
555 | out_put_unused_fd: |
556 | put_unused_fd(fd); | |
d7c51b47 LW |
557 | out_free_descs: |
558 | for (; i >= 0; i--) | |
559 | gpiod_free(lh->descs[i]); | |
560 | kfree(lh->label); | |
561 | out_free_lh: | |
562 | kfree(lh); | |
563 | put_device(&gdev->dev); | |
564 | return ret; | |
565 | } | |
566 | ||
61f922db LW |
567 | /* |
568 | * GPIO line event management | |
569 | */ | |
570 | ||
571 | /** | |
572 | * struct lineevent_state - contains the state of a userspace event | |
573 | * @gdev: the GPIO device the event pertains to | |
574 | * @label: consumer label used to tag descriptors | |
575 | * @desc: the GPIO descriptor held by this event | |
576 | * @eflags: the event flags this line was requested with | |
577 | * @irq: the interrupt that trigger in response to events on this GPIO | |
578 | * @wait: wait queue that handles blocking reads of events | |
579 | * @events: KFIFO for the GPIO events | |
580 | * @read_lock: mutex lock to protect reads from colliding with adding | |
581 | * new events to the FIFO | |
582 | */ | |
583 | struct lineevent_state { | |
584 | struct gpio_device *gdev; | |
585 | const char *label; | |
586 | struct gpio_desc *desc; | |
587 | u32 eflags; | |
588 | int irq; | |
589 | wait_queue_head_t wait; | |
590 | DECLARE_KFIFO(events, struct gpioevent_data, 16); | |
591 | struct mutex read_lock; | |
592 | }; | |
593 | ||
ac7dbb99 LPC |
594 | #define GPIOEVENT_REQUEST_VALID_FLAGS \ |
595 | (GPIOEVENT_REQUEST_RISING_EDGE | \ | |
596 | GPIOEVENT_REQUEST_FALLING_EDGE) | |
597 | ||
61f922db LW |
598 | static unsigned int lineevent_poll(struct file *filep, |
599 | struct poll_table_struct *wait) | |
600 | { | |
601 | struct lineevent_state *le = filep->private_data; | |
602 | unsigned int events = 0; | |
603 | ||
604 | poll_wait(filep, &le->wait, wait); | |
605 | ||
606 | if (!kfifo_is_empty(&le->events)) | |
607 | events = POLLIN | POLLRDNORM; | |
608 | ||
609 | return events; | |
610 | } | |
611 | ||
612 | ||
613 | static ssize_t lineevent_read(struct file *filep, | |
614 | char __user *buf, | |
615 | size_t count, | |
616 | loff_t *f_ps) | |
617 | { | |
618 | struct lineevent_state *le = filep->private_data; | |
619 | unsigned int copied; | |
620 | int ret; | |
621 | ||
622 | if (count < sizeof(struct gpioevent_data)) | |
623 | return -EINVAL; | |
624 | ||
625 | do { | |
626 | if (kfifo_is_empty(&le->events)) { | |
627 | if (filep->f_flags & O_NONBLOCK) | |
628 | return -EAGAIN; | |
629 | ||
630 | ret = wait_event_interruptible(le->wait, | |
631 | !kfifo_is_empty(&le->events)); | |
632 | if (ret) | |
633 | return ret; | |
634 | } | |
635 | ||
636 | if (mutex_lock_interruptible(&le->read_lock)) | |
637 | return -ERESTARTSYS; | |
638 | ret = kfifo_to_user(&le->events, buf, count, &copied); | |
639 | mutex_unlock(&le->read_lock); | |
640 | ||
641 | if (ret) | |
642 | return ret; | |
643 | ||
644 | /* | |
645 | * If we couldn't read anything from the fifo (a different | |
646 | * thread might have been faster) we either return -EAGAIN if | |
647 | * the file descriptor is non-blocking, otherwise we go back to | |
648 | * sleep and wait for more data to arrive. | |
649 | */ | |
650 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) | |
651 | return -EAGAIN; | |
652 | ||
653 | } while (copied == 0); | |
654 | ||
655 | return copied; | |
656 | } | |
657 | ||
658 | static int lineevent_release(struct inode *inode, struct file *filep) | |
659 | { | |
660 | struct lineevent_state *le = filep->private_data; | |
661 | struct gpio_device *gdev = le->gdev; | |
662 | ||
663 | free_irq(le->irq, le); | |
664 | gpiod_free(le->desc); | |
665 | kfree(le->label); | |
666 | kfree(le); | |
667 | put_device(&gdev->dev); | |
668 | return 0; | |
669 | } | |
670 | ||
671 | static long lineevent_ioctl(struct file *filep, unsigned int cmd, | |
672 | unsigned long arg) | |
673 | { | |
674 | struct lineevent_state *le = filep->private_data; | |
675 | void __user *ip = (void __user *)arg; | |
676 | struct gpiohandle_data ghd; | |
677 | ||
678 | /* | |
679 | * We can get the value for an event line but not set it, | |
680 | * because it is input by definition. | |
681 | */ | |
682 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
683 | int val; | |
684 | ||
d82aa4a8 LPC |
685 | memset(&ghd, 0, sizeof(ghd)); |
686 | ||
61f922db LW |
687 | val = gpiod_get_value_cansleep(le->desc); |
688 | if (val < 0) | |
689 | return val; | |
690 | ghd.values[0] = val; | |
691 | ||
692 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
693 | return -EFAULT; | |
694 | ||
695 | return 0; | |
696 | } | |
697 | return -EINVAL; | |
698 | } | |
699 | ||
700 | #ifdef CONFIG_COMPAT | |
701 | static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd, | |
702 | unsigned long arg) | |
703 | { | |
704 | return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
705 | } | |
706 | #endif | |
707 | ||
708 | static const struct file_operations lineevent_fileops = { | |
709 | .release = lineevent_release, | |
710 | .read = lineevent_read, | |
711 | .poll = lineevent_poll, | |
712 | .owner = THIS_MODULE, | |
713 | .llseek = noop_llseek, | |
714 | .unlocked_ioctl = lineevent_ioctl, | |
715 | #ifdef CONFIG_COMPAT | |
716 | .compat_ioctl = lineevent_ioctl_compat, | |
717 | #endif | |
718 | }; | |
719 | ||
33265b17 | 720 | static irqreturn_t lineevent_irq_thread(int irq, void *p) |
61f922db LW |
721 | { |
722 | struct lineevent_state *le = p; | |
723 | struct gpioevent_data ge; | |
df1e76f2 | 724 | int ret, level; |
61f922db LW |
725 | |
726 | ge.timestamp = ktime_get_real_ns(); | |
df1e76f2 | 727 | level = gpiod_get_value_cansleep(le->desc); |
61f922db | 728 | |
ad537b82 BG |
729 | if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE |
730 | && le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { | |
61f922db LW |
731 | if (level) |
732 | /* Emit low-to-high event */ | |
733 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
734 | else | |
735 | /* Emit high-to-low event */ | |
736 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
df1e76f2 | 737 | } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE && level) { |
61f922db LW |
738 | /* Emit low-to-high event */ |
739 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
df1e76f2 | 740 | } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE && !level) { |
61f922db LW |
741 | /* Emit high-to-low event */ |
742 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
bc0207a5 AB |
743 | } else { |
744 | return IRQ_NONE; | |
61f922db LW |
745 | } |
746 | ||
747 | ret = kfifo_put(&le->events, ge); | |
748 | if (ret != 0) | |
749 | wake_up_poll(&le->wait, POLLIN); | |
750 | ||
751 | return IRQ_HANDLED; | |
752 | } | |
753 | ||
754 | static int lineevent_create(struct gpio_device *gdev, void __user *ip) | |
755 | { | |
756 | struct gpioevent_request eventreq; | |
757 | struct lineevent_state *le; | |
758 | struct gpio_desc *desc; | |
953b956a | 759 | struct file *file; |
61f922db LW |
760 | u32 offset; |
761 | u32 lflags; | |
762 | u32 eflags; | |
763 | int fd; | |
764 | int ret; | |
765 | int irqflags = 0; | |
766 | ||
767 | if (copy_from_user(&eventreq, ip, sizeof(eventreq))) | |
768 | return -EFAULT; | |
769 | ||
770 | le = kzalloc(sizeof(*le), GFP_KERNEL); | |
771 | if (!le) | |
772 | return -ENOMEM; | |
773 | le->gdev = gdev; | |
774 | get_device(&gdev->dev); | |
775 | ||
776 | /* Make sure this is terminated */ | |
777 | eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0'; | |
778 | if (strlen(eventreq.consumer_label)) { | |
779 | le->label = kstrdup(eventreq.consumer_label, | |
780 | GFP_KERNEL); | |
781 | if (!le->label) { | |
782 | ret = -ENOMEM; | |
783 | goto out_free_le; | |
784 | } | |
785 | } | |
786 | ||
787 | offset = eventreq.lineoffset; | |
788 | lflags = eventreq.handleflags; | |
789 | eflags = eventreq.eventflags; | |
790 | ||
b8b0e3d3 LPC |
791 | if (offset >= gdev->ngpio) { |
792 | ret = -EINVAL; | |
793 | goto out_free_label; | |
794 | } | |
795 | ||
ac7dbb99 LPC |
796 | /* Return an error if a unknown flag is set */ |
797 | if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) || | |
798 | (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) { | |
799 | ret = -EINVAL; | |
800 | goto out_free_label; | |
801 | } | |
802 | ||
61f922db LW |
803 | /* This is just wrong: we don't look for events on output lines */ |
804 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
805 | ret = -EINVAL; | |
806 | goto out_free_label; | |
807 | } | |
808 | ||
809 | desc = &gdev->descs[offset]; | |
810 | ret = gpiod_request(desc, le->label); | |
811 | if (ret) | |
812 | goto out_free_desc; | |
813 | le->desc = desc; | |
814 | le->eflags = eflags; | |
815 | ||
816 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
817 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
818 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
819 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
820 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
821 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
822 | ||
823 | ret = gpiod_direction_input(desc); | |
824 | if (ret) | |
825 | goto out_free_desc; | |
826 | ||
827 | le->irq = gpiod_to_irq(desc); | |
828 | if (le->irq <= 0) { | |
829 | ret = -ENODEV; | |
830 | goto out_free_desc; | |
831 | } | |
832 | ||
833 | if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) | |
834 | irqflags |= IRQF_TRIGGER_RISING; | |
835 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) | |
836 | irqflags |= IRQF_TRIGGER_FALLING; | |
837 | irqflags |= IRQF_ONESHOT; | |
838 | irqflags |= IRQF_SHARED; | |
839 | ||
840 | INIT_KFIFO(le->events); | |
841 | init_waitqueue_head(&le->wait); | |
842 | mutex_init(&le->read_lock); | |
843 | ||
844 | /* Request a thread to read the events */ | |
845 | ret = request_threaded_irq(le->irq, | |
846 | NULL, | |
847 | lineevent_irq_thread, | |
848 | irqflags, | |
849 | le->label, | |
850 | le); | |
851 | if (ret) | |
852 | goto out_free_desc; | |
853 | ||
953b956a | 854 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
61f922db LW |
855 | if (fd < 0) { |
856 | ret = fd; | |
857 | goto out_free_irq; | |
858 | } | |
859 | ||
953b956a LPC |
860 | file = anon_inode_getfile("gpio-event", |
861 | &lineevent_fileops, | |
862 | le, | |
863 | O_RDONLY | O_CLOEXEC); | |
864 | if (IS_ERR(file)) { | |
865 | ret = PTR_ERR(file); | |
866 | goto out_put_unused_fd; | |
867 | } | |
868 | ||
61f922db | 869 | eventreq.fd = fd; |
d932cd49 | 870 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
953b956a LPC |
871 | /* |
872 | * fput() will trigger the release() callback, so do not go onto | |
873 | * the regular error cleanup path here. | |
874 | */ | |
875 | fput(file); | |
876 | put_unused_fd(fd); | |
877 | return -EFAULT; | |
d932cd49 | 878 | } |
61f922db | 879 | |
953b956a LPC |
880 | fd_install(fd, file); |
881 | ||
61f922db LW |
882 | return 0; |
883 | ||
953b956a LPC |
884 | out_put_unused_fd: |
885 | put_unused_fd(fd); | |
61f922db LW |
886 | out_free_irq: |
887 | free_irq(le->irq, le); | |
888 | out_free_desc: | |
889 | gpiod_free(le->desc); | |
890 | out_free_label: | |
891 | kfree(le->label); | |
892 | out_free_le: | |
893 | kfree(le); | |
894 | put_device(&gdev->dev); | |
895 | return ret; | |
896 | } | |
897 | ||
950d55f5 | 898 | /* |
3c702e99 LW |
899 | * gpio_ioctl() - ioctl handler for the GPIO chardev |
900 | */ | |
901 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
902 | { | |
903 | struct gpio_device *gdev = filp->private_data; | |
904 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 905 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
906 | |
907 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
908 | if (!chip) | |
909 | return -ENODEV; | |
910 | ||
521a2ad6 | 911 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 912 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
913 | struct gpiochip_info chipinfo; |
914 | ||
0f4bbb23 LPC |
915 | memset(&chipinfo, 0, sizeof(chipinfo)); |
916 | ||
3c702e99 LW |
917 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
918 | sizeof(chipinfo.name)); | |
919 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
920 | strncpy(chipinfo.label, gdev->label, |
921 | sizeof(chipinfo.label)); | |
922 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 923 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
924 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
925 | return -EFAULT; | |
926 | return 0; | |
521a2ad6 LW |
927 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
928 | struct gpioline_info lineinfo; | |
929 | struct gpio_desc *desc; | |
930 | ||
931 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
932 | return -EFAULT; | |
1f1cc456 | 933 | if (lineinfo.line_offset >= gdev->ngpio) |
521a2ad6 LW |
934 | return -EINVAL; |
935 | ||
936 | desc = &gdev->descs[lineinfo.line_offset]; | |
937 | if (desc->name) { | |
938 | strncpy(lineinfo.name, desc->name, | |
939 | sizeof(lineinfo.name)); | |
940 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
941 | } else { | |
942 | lineinfo.name[0] = '\0'; | |
943 | } | |
944 | if (desc->label) { | |
214338e3 LW |
945 | strncpy(lineinfo.consumer, desc->label, |
946 | sizeof(lineinfo.consumer)); | |
947 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 948 | } else { |
214338e3 | 949 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
950 | } |
951 | ||
952 | /* | |
953 | * Userspace only need to know that the kernel is using | |
954 | * this GPIO so it can't use it. | |
955 | */ | |
956 | lineinfo.flags = 0; | |
9d8cc89c LW |
957 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
958 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
959 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
960 | test_bit(FLAG_EXPORT, &desc->flags) || | |
961 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 962 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 963 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 964 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 965 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 966 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 967 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 968 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 969 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
970 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
971 | ||
972 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
973 | return -EFAULT; | |
974 | return 0; | |
d7c51b47 LW |
975 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
976 | return linehandle_create(gdev, ip); | |
61f922db LW |
977 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
978 | return lineevent_create(gdev, ip); | |
3c702e99 LW |
979 | } |
980 | return -EINVAL; | |
981 | } | |
982 | ||
8b92e17e LW |
983 | #ifdef CONFIG_COMPAT |
984 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
985 | unsigned long arg) | |
986 | { | |
987 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
988 | } | |
989 | #endif | |
990 | ||
3c702e99 LW |
991 | /** |
992 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
993 | * @inode: inode for this chardev | |
994 | * @filp: file struct for storing private data | |
995 | * Returns 0 on success | |
996 | */ | |
997 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
998 | { | |
999 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1000 | struct gpio_device, chrdev); | |
1001 | ||
1002 | /* Fail on open if the backing gpiochip is gone */ | |
fb505747 | 1003 | if (!gdev->chip) |
3c702e99 LW |
1004 | return -ENODEV; |
1005 | get_device(&gdev->dev); | |
1006 | filp->private_data = gdev; | |
f4e81c52 LPC |
1007 | |
1008 | return nonseekable_open(inode, filp); | |
3c702e99 LW |
1009 | } |
1010 | ||
1011 | /** | |
1012 | * gpio_chrdev_release() - close chardev after ioctl operations | |
1013 | * @inode: inode for this chardev | |
1014 | * @filp: file struct for storing private data | |
1015 | * Returns 0 on success | |
1016 | */ | |
1017 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
1018 | { | |
1019 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1020 | struct gpio_device, chrdev); | |
1021 | ||
3c702e99 LW |
1022 | put_device(&gdev->dev); |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | ||
1027 | static const struct file_operations gpio_fileops = { | |
1028 | .release = gpio_chrdev_release, | |
1029 | .open = gpio_chrdev_open, | |
1030 | .owner = THIS_MODULE, | |
f4e81c52 | 1031 | .llseek = no_llseek, |
3c702e99 | 1032 | .unlocked_ioctl = gpio_ioctl, |
8b92e17e LW |
1033 | #ifdef CONFIG_COMPAT |
1034 | .compat_ioctl = gpio_ioctl_compat, | |
1035 | #endif | |
3c702e99 LW |
1036 | }; |
1037 | ||
ff2b1359 LW |
1038 | static void gpiodevice_release(struct device *dev) |
1039 | { | |
1040 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
1041 | ||
1042 | list_del(&gdev->list); | |
1043 | ida_simple_remove(&gpio_ida, gdev->id); | |
476e2fc5 GR |
1044 | kfree(gdev->label); |
1045 | kfree(gdev->descs); | |
9efd9e69 | 1046 | kfree(gdev); |
ff2b1359 LW |
1047 | } |
1048 | ||
159f3cd9 GR |
1049 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
1050 | { | |
1051 | int status; | |
1052 | ||
1053 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
1054 | gdev->chrdev.owner = THIS_MODULE; | |
159f3cd9 | 1055 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); |
111379dc LG |
1056 | |
1057 | status = cdev_device_add(&gdev->chrdev, &gdev->dev); | |
159f3cd9 | 1058 | if (status) |
111379dc LG |
1059 | return status; |
1060 | ||
1061 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
1062 | MAJOR(gpio_devt), gdev->id); | |
159f3cd9 GR |
1063 | |
1064 | status = gpiochip_sysfs_register(gdev); | |
1065 | if (status) | |
1066 | goto err_remove_device; | |
1067 | ||
1068 | /* From this point, the .release() function cleans up gpio_device */ | |
1069 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
1070 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
1071 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
1072 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
1073 | ||
1074 | return 0; | |
1075 | ||
1076 | err_remove_device: | |
111379dc | 1077 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
159f3cd9 GR |
1078 | return status; |
1079 | } | |
1080 | ||
1081 | static void gpiochip_setup_devs(void) | |
1082 | { | |
1083 | struct gpio_device *gdev; | |
1084 | int err; | |
1085 | ||
1086 | list_for_each_entry(gdev, &gpio_devices, list) { | |
1087 | err = gpiochip_setup_dev(gdev); | |
1088 | if (err) | |
1089 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
1090 | dev_name(&gdev->dev), err); | |
1091 | } | |
1092 | } | |
1093 | ||
d2876d08 | 1094 | /** |
b08ea35a | 1095 | * gpiochip_add_data() - register a gpio_chip |
d2876d08 | 1096 | * @chip: the chip to register, with chip->base initialized |
950d55f5 | 1097 | * @data: driver-private data associated with this chip |
d2876d08 | 1098 | * |
950d55f5 | 1099 | * Context: potentially before irqs will work |
8d0aab2f | 1100 | * |
b08ea35a | 1101 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
c88402c2 | 1102 | * can be freely used, the chip->parent device must be registered before |
d8f388d8 DB |
1103 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
1104 | * for GPIOs will fail rudely. | |
1105 | * | |
159f3cd9 GR |
1106 | * gpiochip_add_data() must only be called after gpiolib initialization, |
1107 | * ie after core_initcall(). | |
1108 | * | |
8d0aab2f AV |
1109 | * If chip->base is negative, this requests dynamic assignment of |
1110 | * a range of valid GPIOs. | |
950d55f5 TR |
1111 | * |
1112 | * Returns: | |
1113 | * A negative errno if the chip can't be registered, such as because the | |
1114 | * chip->base is invalid or already associated with a different chip. | |
1115 | * Otherwise it returns zero as a success code. | |
d2876d08 | 1116 | */ |
b08ea35a | 1117 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
d2876d08 DB |
1118 | { |
1119 | unsigned long flags; | |
1120 | int status = 0; | |
ff2b1359 | 1121 | unsigned i; |
8d0aab2f | 1122 | int base = chip->base; |
ff2b1359 | 1123 | struct gpio_device *gdev; |
d2876d08 | 1124 | |
ff2b1359 LW |
1125 | /* |
1126 | * First: allocate and populate the internal stat container, and | |
1127 | * set up the struct device. | |
1128 | */ | |
969f07b4 | 1129 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 1130 | if (!gdev) |
14e85c0e | 1131 | return -ENOMEM; |
3c702e99 | 1132 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
1133 | gdev->chip = chip; |
1134 | chip->gpiodev = gdev; | |
1135 | if (chip->parent) { | |
1136 | gdev->dev.parent = chip->parent; | |
1137 | gdev->dev.of_node = chip->parent->of_node; | |
acc6e331 TR |
1138 | } |
1139 | ||
ff2b1359 LW |
1140 | #ifdef CONFIG_OF_GPIO |
1141 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
acc6e331 TR |
1142 | if (chip->of_node) |
1143 | gdev->dev.of_node = chip->of_node; | |
ff2b1359 | 1144 | #endif |
acc6e331 | 1145 | |
ff2b1359 LW |
1146 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
1147 | if (gdev->id < 0) { | |
1148 | status = gdev->id; | |
1149 | goto err_free_gdev; | |
1150 | } | |
1151 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
1152 | device_initialize(&gdev->dev); | |
1153 | dev_set_drvdata(&gdev->dev, gdev); | |
1154 | if (chip->parent && chip->parent->driver) | |
1155 | gdev->owner = chip->parent->driver->owner; | |
1156 | else if (chip->owner) | |
1157 | /* TODO: remove chip->owner */ | |
1158 | gdev->owner = chip->owner; | |
1159 | else | |
1160 | gdev->owner = THIS_MODULE; | |
d2876d08 | 1161 | |
476e2fc5 | 1162 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 1163 | if (!gdev->descs) { |
ff2b1359 LW |
1164 | status = -ENOMEM; |
1165 | goto err_free_gdev; | |
1166 | } | |
1167 | ||
5ed41cc4 BJZ |
1168 | if (chip->ngpio == 0) { |
1169 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 1170 | status = -EINVAL; |
159f3cd9 | 1171 | goto err_free_descs; |
5ed41cc4 | 1172 | } |
df4878e9 LW |
1173 | |
1174 | if (chip->label) | |
476e2fc5 | 1175 | gdev->label = kstrdup(chip->label, GFP_KERNEL); |
df4878e9 | 1176 | else |
476e2fc5 | 1177 | gdev->label = kstrdup("unknown", GFP_KERNEL); |
df4878e9 LW |
1178 | if (!gdev->label) { |
1179 | status = -ENOMEM; | |
476e2fc5 | 1180 | goto err_free_descs; |
df4878e9 LW |
1181 | } |
1182 | ||
fdeb8e15 | 1183 | gdev->ngpio = chip->ngpio; |
43c54eca | 1184 | gdev->data = data; |
5ed41cc4 | 1185 | |
d2876d08 DB |
1186 | spin_lock_irqsave(&gpio_lock, flags); |
1187 | ||
fdeb8e15 LW |
1188 | /* |
1189 | * TODO: this allocates a Linux GPIO number base in the global | |
1190 | * GPIO numberspace for this chip. In the long run we want to | |
1191 | * get *rid* of this numberspace and use only descriptors, but | |
1192 | * it may be a pipe dream. It will not happen before we get rid | |
1193 | * of the sysfs interface anyways. | |
1194 | */ | |
8d0aab2f AV |
1195 | if (base < 0) { |
1196 | base = gpiochip_find_base(chip->ngpio); | |
1197 | if (base < 0) { | |
1198 | status = base; | |
225fce83 | 1199 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1200 | goto err_free_label; |
8d0aab2f | 1201 | } |
fdeb8e15 LW |
1202 | /* |
1203 | * TODO: it should not be necessary to reflect the assigned | |
1204 | * base outside of the GPIO subsystem. Go over drivers and | |
1205 | * see if anyone makes use of this, else drop this and assign | |
1206 | * a poison instead. | |
1207 | */ | |
8d0aab2f AV |
1208 | chip->base = base; |
1209 | } | |
fdeb8e15 | 1210 | gdev->base = base; |
8d0aab2f | 1211 | |
ff2b1359 | 1212 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
1213 | if (status) { |
1214 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 1215 | goto err_free_label; |
05aa5203 | 1216 | } |
1a989d0f | 1217 | |
545ebd9a LW |
1218 | spin_unlock_irqrestore(&gpio_lock, flags); |
1219 | ||
ff2b1359 | 1220 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 1221 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 1222 | |
fdeb8e15 | 1223 | desc->gdev = gdev; |
72d32000 LW |
1224 | /* |
1225 | * REVISIT: most hardware initializes GPIOs as inputs | |
1226 | * (often with pullups enabled) so power usage is | |
1227 | * minimized. Linux code should set the gpio direction | |
1228 | * first thing; but until it does, and in case | |
1229 | * chip->get_direction is not set, we may expose the | |
1230 | * wrong direction in sysfs. | |
05aa5203 | 1231 | */ |
72d32000 LW |
1232 | |
1233 | if (chip->get_direction) { | |
1234 | /* | |
1235 | * If we have .get_direction, set up the initial | |
1236 | * direction flag from the hardware. | |
1237 | */ | |
1238 | int dir = chip->get_direction(chip, i); | |
1239 | ||
1240 | if (!dir) | |
1241 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1242 | } else if (!chip->direction_input) { | |
1243 | /* | |
1244 | * If the chip lacks the .direction_input callback | |
1245 | * we logically assume all lines are outputs. | |
1246 | */ | |
1247 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1248 | } | |
d2876d08 | 1249 | } |
14e85c0e | 1250 | |
f23f1516 | 1251 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 1252 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
1253 | #endif |
1254 | ||
5f3ca732 MP |
1255 | status = gpiochip_set_desc_names(chip); |
1256 | if (status) | |
1257 | goto err_remove_from_list; | |
1258 | ||
79b804cb MW |
1259 | status = gpiochip_irqchip_init_valid_mask(chip); |
1260 | if (status) | |
1261 | goto err_remove_from_list; | |
1262 | ||
28355f81 TV |
1263 | status = of_gpiochip_add(chip); |
1264 | if (status) | |
1265 | goto err_remove_chip; | |
1266 | ||
664e3e5a | 1267 | acpi_gpiochip_add(chip); |
391c970c | 1268 | |
3c702e99 LW |
1269 | /* |
1270 | * By first adding the chardev, and then adding the device, | |
1271 | * we get a device node entry in sysfs under | |
1272 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
1273 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
1274 | * We can do this only if gpiolib has been initialized. |
1275 | * Otherwise, defer until later. | |
3c702e99 | 1276 | */ |
159f3cd9 GR |
1277 | if (gpiolib_initialized) { |
1278 | status = gpiochip_setup_dev(gdev); | |
1279 | if (status) | |
1280 | goto err_remove_chip; | |
1281 | } | |
cedb1881 | 1282 | return 0; |
3bae4811 | 1283 | |
225fce83 JH |
1284 | err_remove_chip: |
1285 | acpi_gpiochip_remove(chip); | |
6d86750c | 1286 | gpiochip_free_hogs(chip); |
225fce83 | 1287 | of_gpiochip_remove(chip); |
79b804cb | 1288 | gpiochip_irqchip_free_valid_mask(chip); |
5f3ca732 | 1289 | err_remove_from_list: |
225fce83 | 1290 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 1291 | list_del(&gdev->list); |
3bae4811 | 1292 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 GR |
1293 | err_free_label: |
1294 | kfree(gdev->label); | |
1295 | err_free_descs: | |
1296 | kfree(gdev->descs); | |
ff2b1359 LW |
1297 | err_free_gdev: |
1298 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 1299 | /* failures here can mean systems won't boot... */ |
7589e59f | 1300 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
fdeb8e15 LW |
1301 | gdev->base, gdev->base + gdev->ngpio - 1, |
1302 | chip->label ? : "generic"); | |
1303 | kfree(gdev); | |
d2876d08 DB |
1304 | return status; |
1305 | } | |
b08ea35a | 1306 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
d2876d08 | 1307 | |
43c54eca LW |
1308 | /** |
1309 | * gpiochip_get_data() - get per-subdriver data for the chip | |
950d55f5 TR |
1310 | * @chip: GPIO chip |
1311 | * | |
1312 | * Returns: | |
1313 | * The per-subdriver data for the chip. | |
43c54eca LW |
1314 | */ |
1315 | void *gpiochip_get_data(struct gpio_chip *chip) | |
1316 | { | |
1317 | return chip->gpiodev->data; | |
1318 | } | |
1319 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
1320 | ||
d2876d08 DB |
1321 | /** |
1322 | * gpiochip_remove() - unregister a gpio_chip | |
1323 | * @chip: the chip to unregister | |
1324 | * | |
1325 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1326 | */ | |
e1db1706 | 1327 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 1328 | { |
ff2b1359 | 1329 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 1330 | struct gpio_desc *desc; |
d2876d08 | 1331 | unsigned long flags; |
1c3cdb18 | 1332 | unsigned i; |
fab28b89 | 1333 | bool requested = false; |
d2876d08 | 1334 | |
ff2b1359 | 1335 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 1336 | gpiochip_sysfs_unregister(gdev); |
5018ada6 | 1337 | gpiochip_free_hogs(chip); |
bd203bd5 BJZ |
1338 | /* Numb the device, cancelling all outstanding operations */ |
1339 | gdev->chip = NULL; | |
00acc3dc | 1340 | gpiochip_irqchip_remove(chip); |
6072b9dc | 1341 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 1342 | gpiochip_remove_pin_ranges(chip); |
391c970c | 1343 | of_gpiochip_remove(chip); |
43c54eca LW |
1344 | /* |
1345 | * We accept no more calls into the driver from this point, so | |
1346 | * NULL the driver data pointer | |
1347 | */ | |
1348 | gdev->data = NULL; | |
391c970c | 1349 | |
6798acaa | 1350 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 1351 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 1352 | desc = &gdev->descs[i]; |
fab28b89 JH |
1353 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
1354 | requested = true; | |
d2876d08 | 1355 | } |
d2876d08 | 1356 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 1357 | |
fab28b89 | 1358 | if (requested) |
fdeb8e15 | 1359 | dev_crit(&gdev->dev, |
58383c78 | 1360 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 1361 | |
ff2b1359 LW |
1362 | /* |
1363 | * The gpiochip side puts its use of the device to rest here: | |
1364 | * if there are no userspace clients, the chardev and device will | |
1365 | * be removed, else it will be dangling until the last user is | |
1366 | * gone. | |
1367 | */ | |
111379dc | 1368 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
ff2b1359 | 1369 | put_device(&gdev->dev); |
d2876d08 DB |
1370 | } |
1371 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1372 | ||
0cf3292c LD |
1373 | static void devm_gpio_chip_release(struct device *dev, void *res) |
1374 | { | |
1375 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
1376 | ||
1377 | gpiochip_remove(chip); | |
1378 | } | |
1379 | ||
1380 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) | |
1381 | ||
1382 | { | |
1383 | struct gpio_chip **r = res; | |
1384 | ||
1385 | if (!r || !*r) { | |
1386 | WARN_ON(!r || !*r); | |
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | return *r == data; | |
1391 | } | |
1392 | ||
1393 | /** | |
1394 | * devm_gpiochip_add_data() - Resource manager piochip_add_data() | |
1395 | * @dev: the device pointer on which irq_chip belongs to. | |
1396 | * @chip: the chip to register, with chip->base initialized | |
950d55f5 | 1397 | * @data: driver-private data associated with this chip |
0cf3292c | 1398 | * |
950d55f5 | 1399 | * Context: potentially before irqs will work |
0cf3292c LD |
1400 | * |
1401 | * The gpio chip automatically be released when the device is unbound. | |
950d55f5 TR |
1402 | * |
1403 | * Returns: | |
1404 | * A negative errno if the chip can't be registered, such as because the | |
1405 | * chip->base is invalid or already associated with a different chip. | |
1406 | * Otherwise it returns zero as a success code. | |
0cf3292c LD |
1407 | */ |
1408 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
1409 | void *data) | |
1410 | { | |
1411 | struct gpio_chip **ptr; | |
1412 | int ret; | |
1413 | ||
1414 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
1415 | GFP_KERNEL); | |
1416 | if (!ptr) | |
1417 | return -ENOMEM; | |
1418 | ||
1419 | ret = gpiochip_add_data(chip, data); | |
1420 | if (ret < 0) { | |
1421 | devres_free(ptr); | |
1422 | return ret; | |
1423 | } | |
1424 | ||
1425 | *ptr = chip; | |
1426 | devres_add(dev, ptr); | |
1427 | ||
1428 | return 0; | |
1429 | } | |
1430 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
1431 | ||
1432 | /** | |
1433 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() | |
1434 | * @dev: device for which which resource was allocated | |
1435 | * @chip: the chip to remove | |
1436 | * | |
1437 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1438 | */ | |
1439 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) | |
1440 | { | |
1441 | int ret; | |
1442 | ||
1443 | ret = devres_release(dev, devm_gpio_chip_release, | |
1444 | devm_gpio_chip_match, chip); | |
3988d663 | 1445 | WARN_ON(ret); |
0cf3292c LD |
1446 | } |
1447 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); | |
1448 | ||
594fa265 GL |
1449 | /** |
1450 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1451 | * @data: data to pass to match function | |
950d55f5 | 1452 | * @match: Callback function to check gpio_chip |
594fa265 GL |
1453 | * |
1454 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1455 | * determined by a user supplied @match callback. The callback should return | |
1456 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1457 | * non-zero, this function will return to the caller and not iterate over any | |
1458 | * more gpio_chips. | |
1459 | */ | |
07ce8ec7 | 1460 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1461 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1462 | void *data)) |
594fa265 | 1463 | { |
ff2b1359 | 1464 | struct gpio_device *gdev; |
acf06ff7 | 1465 | struct gpio_chip *chip = NULL; |
594fa265 | 1466 | unsigned long flags; |
594fa265 GL |
1467 | |
1468 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 1469 | list_for_each_entry(gdev, &gpio_devices, list) |
acf06ff7 MY |
1470 | if (gdev->chip && match(gdev->chip, data)) { |
1471 | chip = gdev->chip; | |
594fa265 | 1472 | break; |
acf06ff7 | 1473 | } |
ff2b1359 | 1474 | |
594fa265 GL |
1475 | spin_unlock_irqrestore(&gpio_lock, flags); |
1476 | ||
1477 | return chip; | |
1478 | } | |
8fa0c9bf | 1479 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1480 | |
79697ef9 AC |
1481 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
1482 | { | |
1483 | const char *name = data; | |
1484 | ||
1485 | return !strcmp(chip->label, name); | |
1486 | } | |
1487 | ||
1488 | static struct gpio_chip *find_chip_by_name(const char *name) | |
1489 | { | |
1490 | return gpiochip_find((void *)name, gpiochip_match_name); | |
1491 | } | |
1492 | ||
14250520 LW |
1493 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
1494 | ||
1495 | /* | |
1496 | * The following is irqchip helper code for gpiochips. | |
1497 | */ | |
1498 | ||
79b804cb MW |
1499 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1500 | { | |
79b804cb MW |
1501 | if (!gpiochip->irq_need_valid_mask) |
1502 | return 0; | |
1503 | ||
1504 | gpiochip->irq_valid_mask = kcalloc(BITS_TO_LONGS(gpiochip->ngpio), | |
1505 | sizeof(long), GFP_KERNEL); | |
1506 | if (!gpiochip->irq_valid_mask) | |
1507 | return -ENOMEM; | |
1508 | ||
1509 | /* Assume by default all GPIOs are valid */ | |
923a654c | 1510 | bitmap_fill(gpiochip->irq_valid_mask, gpiochip->ngpio); |
79b804cb MW |
1511 | |
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1516 | { | |
1517 | kfree(gpiochip->irq_valid_mask); | |
1518 | gpiochip->irq_valid_mask = NULL; | |
1519 | } | |
1520 | ||
1521 | static bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, | |
1522 | unsigned int offset) | |
1523 | { | |
1524 | /* No mask means all valid */ | |
1525 | if (likely(!gpiochip->irq_valid_mask)) | |
1526 | return true; | |
1527 | return test_bit(offset, gpiochip->irq_valid_mask); | |
1528 | } | |
1529 | ||
14250520 | 1530 | /** |
d245b3f9 | 1531 | * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip |
3f97d5fc LW |
1532 | * @gpiochip: the gpiochip to set the irqchip chain to |
1533 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
1534 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
1535 | * chained irqchip | |
1536 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
1537 | * coming out of the gpiochip. If the interrupt is nested rather than |
1538 | * cascaded, pass NULL in this handler argument | |
14250520 | 1539 | */ |
d245b3f9 LW |
1540 | static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip, |
1541 | struct irq_chip *irqchip, | |
6f79309a | 1542 | unsigned int parent_irq, |
d245b3f9 | 1543 | irq_flow_handler_t parent_handler) |
14250520 | 1544 | { |
83141a77 LW |
1545 | unsigned int offset; |
1546 | ||
83141a77 LW |
1547 | if (!gpiochip->irqdomain) { |
1548 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
1549 | __func__); | |
1c8732bb LW |
1550 | return; |
1551 | } | |
1552 | ||
3f97d5fc LW |
1553 | if (parent_handler) { |
1554 | if (gpiochip->can_sleep) { | |
1555 | chip_err(gpiochip, | |
1556 | "you cannot have chained interrupts on a " | |
1557 | "chip that may sleep\n"); | |
1558 | return; | |
1559 | } | |
3f97d5fc LW |
1560 | /* |
1561 | * The parent irqchip is already using the chip_data for this | |
1562 | * irqchip, so our callbacks simply use the handler_data. | |
1563 | */ | |
f7f87753 TG |
1564 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
1565 | gpiochip); | |
25e4fe92 | 1566 | |
d245b3f9 | 1567 | gpiochip->irq_chained_parent = parent_irq; |
3f97d5fc | 1568 | } |
83141a77 LW |
1569 | |
1570 | /* Set the parent IRQ for all affected IRQs */ | |
79b804cb MW |
1571 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1572 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1573 | continue; | |
83141a77 LW |
1574 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), |
1575 | parent_irq); | |
79b804cb | 1576 | } |
14250520 | 1577 | } |
d245b3f9 LW |
1578 | |
1579 | /** | |
1580 | * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip | |
1581 | * @gpiochip: the gpiochip to set the irqchip chain to | |
1582 | * @irqchip: the irqchip to chain to the gpiochip | |
1583 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1584 | * chained irqchip | |
1585 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
1586 | * coming out of the gpiochip. If the interrupt is nested rather than | |
1587 | * cascaded, pass NULL in this handler argument | |
1588 | */ | |
1589 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
1590 | struct irq_chip *irqchip, | |
6f79309a | 1591 | unsigned int parent_irq, |
d245b3f9 LW |
1592 | irq_flow_handler_t parent_handler) |
1593 | { | |
1594 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, | |
1595 | parent_handler); | |
1596 | } | |
14250520 LW |
1597 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); |
1598 | ||
d245b3f9 LW |
1599 | /** |
1600 | * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip | |
1601 | * @gpiochip: the gpiochip to set the irqchip nested handler to | |
1602 | * @irqchip: the irqchip to nest to the gpiochip | |
1603 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1604 | * nested irqchip | |
1605 | */ | |
1606 | void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, | |
1607 | struct irq_chip *irqchip, | |
6f79309a | 1608 | unsigned int parent_irq) |
d245b3f9 LW |
1609 | { |
1610 | if (!gpiochip->irq_nested) { | |
1611 | chip_err(gpiochip, "tried to nest a chained gpiochip\n"); | |
1612 | return; | |
1613 | } | |
1614 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, | |
1615 | NULL); | |
1616 | } | |
1617 | EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip); | |
1618 | ||
14250520 LW |
1619 | /** |
1620 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
1621 | * @d: the irqdomain used by this irqchip | |
1622 | * @irq: the global irq number used by this GPIO irqchip irq | |
1623 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
1624 | * | |
1625 | * This function will set up the mapping for a certain IRQ line on a | |
1626 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
1627 | * stored inside the gpiochip. | |
1628 | */ | |
1629 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
1630 | irq_hw_number_t hwirq) | |
1631 | { | |
1632 | struct gpio_chip *chip = d->host_data; | |
1633 | ||
dc749a09 GS |
1634 | if (!gpiochip_irqchip_irq_valid(chip, hwirq)) |
1635 | return -ENXIO; | |
1636 | ||
14250520 | 1637 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
1638 | /* |
1639 | * This lock class tells lockdep that GPIO irqs are in a different | |
1640 | * category than their parents, so it won't report false recursion. | |
1641 | */ | |
1642 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 1643 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
d245b3f9 LW |
1644 | /* Chips that use nested thread handlers have them marked */ |
1645 | if (chip->irq_nested) | |
1c8732bb | 1646 | irq_set_nested_thread(irq, 1); |
14250520 | 1647 | irq_set_noprobe(irq); |
23393d49 | 1648 | |
1333b90f LW |
1649 | /* |
1650 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
1651 | * is passed as default type. | |
1652 | */ | |
1653 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
1654 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
1655 | |
1656 | return 0; | |
1657 | } | |
1658 | ||
c3626fde LW |
1659 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
1660 | { | |
1c8732bb LW |
1661 | struct gpio_chip *chip = d->host_data; |
1662 | ||
d245b3f9 | 1663 | if (chip->irq_nested) |
1c8732bb | 1664 | irq_set_nested_thread(irq, 0); |
c3626fde LW |
1665 | irq_set_chip_and_handler(irq, NULL, NULL); |
1666 | irq_set_chip_data(irq, NULL); | |
1667 | } | |
1668 | ||
14250520 LW |
1669 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1670 | .map = gpiochip_irq_map, | |
c3626fde | 1671 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1672 | /* Virtually all GPIO irqchips are twocell:ed */ |
1673 | .xlate = irq_domain_xlate_twocell, | |
1674 | }; | |
1675 | ||
1676 | static int gpiochip_irq_reqres(struct irq_data *d) | |
1677 | { | |
1678 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1679 | ||
ff2b1359 | 1680 | if (!try_module_get(chip->gpiodev->owner)) |
5b76e79c GS |
1681 | return -ENODEV; |
1682 | ||
e3a2e878 | 1683 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
1684 | chip_err(chip, |
1685 | "unable to lock HW IRQ %lu for IRQ\n", | |
1686 | d->hwirq); | |
ff2b1359 | 1687 | module_put(chip->gpiodev->owner); |
14250520 LW |
1688 | return -EINVAL; |
1689 | } | |
1690 | return 0; | |
1691 | } | |
1692 | ||
1693 | static void gpiochip_irq_relres(struct irq_data *d) | |
1694 | { | |
1695 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1696 | ||
e3a2e878 | 1697 | gpiochip_unlock_as_irq(chip, d->hwirq); |
ff2b1359 | 1698 | module_put(chip->gpiodev->owner); |
14250520 LW |
1699 | } |
1700 | ||
1701 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
1702 | { | |
dc749a09 GS |
1703 | if (!gpiochip_irqchip_irq_valid(chip, offset)) |
1704 | return -ENXIO; | |
1705 | return irq_create_mapping(chip->irqdomain, offset); | |
14250520 LW |
1706 | } |
1707 | ||
1708 | /** | |
1709 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1710 | * @gpiochip: the gpiochip to remove the irqchip from | |
1711 | * | |
1712 | * This is called only from gpiochip_remove() | |
1713 | */ | |
1714 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1715 | { | |
c3626fde LW |
1716 | unsigned int offset; |
1717 | ||
afa82fab MW |
1718 | acpi_gpiochip_free_interrupts(gpiochip); |
1719 | ||
d245b3f9 LW |
1720 | if (gpiochip->irq_chained_parent) { |
1721 | irq_set_chained_handler(gpiochip->irq_chained_parent, NULL); | |
1722 | irq_set_handler_data(gpiochip->irq_chained_parent, NULL); | |
25e4fe92 DES |
1723 | } |
1724 | ||
c3626fde LW |
1725 | /* Remove all IRQ mappings and delete the domain */ |
1726 | if (gpiochip->irqdomain) { | |
79b804cb MW |
1727 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1728 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1729 | continue; | |
e3893386 GS |
1730 | irq_dispose_mapping( |
1731 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
79b804cb | 1732 | } |
14250520 | 1733 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 1734 | } |
14250520 LW |
1735 | |
1736 | if (gpiochip->irqchip) { | |
1737 | gpiochip->irqchip->irq_request_resources = NULL; | |
1738 | gpiochip->irqchip->irq_release_resources = NULL; | |
1739 | gpiochip->irqchip = NULL; | |
1740 | } | |
79b804cb MW |
1741 | |
1742 | gpiochip_irqchip_free_valid_mask(gpiochip); | |
14250520 LW |
1743 | } |
1744 | ||
1745 | /** | |
739e6f59 | 1746 | * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip |
14250520 LW |
1747 | * @gpiochip: the gpiochip to add the irqchip to |
1748 | * @irqchip: the irqchip to add to the gpiochip | |
1749 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
1750 | * allocate gpiochip irqs from | |
1751 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
1752 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
1753 | * to have the core avoid setting up any default type in the hardware. | |
d245b3f9 LW |
1754 | * @nested: whether this is a nested irqchip calling handle_nested_irq() |
1755 | * in its IRQ handler | |
a0a8bcf4 | 1756 | * @lock_key: lockdep class |
14250520 LW |
1757 | * |
1758 | * This function closely associates a certain irqchip with a certain | |
1759 | * gpiochip, providing an irq domain to translate the local IRQs to | |
1760 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
1761 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 1762 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
1763 | * from the gpiochip passed as chip data. An irqdomain will be stored |
1764 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
1765 | * translation. The gpiochip will need to be initialized and registered | |
1766 | * before calling this function. | |
1767 | * | |
c3626fde LW |
1768 | * This function will handle two cell:ed simple IRQs and assumes all |
1769 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
1770 | * need to be open coded. |
1771 | */ | |
739e6f59 LW |
1772 | int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, |
1773 | struct irq_chip *irqchip, | |
1774 | unsigned int first_irq, | |
1775 | irq_flow_handler_t handler, | |
1776 | unsigned int type, | |
1777 | bool nested, | |
1778 | struct lock_class_key *lock_key) | |
14250520 LW |
1779 | { |
1780 | struct device_node *of_node; | |
14250520 LW |
1781 | |
1782 | if (!gpiochip || !irqchip) | |
1783 | return -EINVAL; | |
1784 | ||
58383c78 | 1785 | if (!gpiochip->parent) { |
14250520 LW |
1786 | pr_err("missing gpiochip .dev parent pointer\n"); |
1787 | return -EINVAL; | |
1788 | } | |
d245b3f9 | 1789 | gpiochip->irq_nested = nested; |
58383c78 | 1790 | of_node = gpiochip->parent->of_node; |
14250520 LW |
1791 | #ifdef CONFIG_OF_GPIO |
1792 | /* | |
20a8a968 | 1793 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
1794 | * FIXME: get rid of this and use gpiochip->parent->of_node |
1795 | * everywhere | |
14250520 LW |
1796 | */ |
1797 | if (gpiochip->of_node) | |
1798 | of_node = gpiochip->of_node; | |
1799 | #endif | |
332e99d5 | 1800 | /* |
0a1e0053 | 1801 | * Specifying a default trigger is a terrible idea if DT or ACPI is |
332e99d5 MZ |
1802 | * used to configure the interrupts, as you may end-up with |
1803 | * conflicting triggers. Tell the user, and reset to NONE. | |
1804 | */ | |
1805 | if (WARN(of_node && type != IRQ_TYPE_NONE, | |
7eb6ce2f | 1806 | "%pOF: Ignoring %d default trigger\n", of_node, type)) |
332e99d5 | 1807 | type = IRQ_TYPE_NONE; |
0a1e0053 MW |
1808 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { |
1809 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
1810 | "Ignoring %d default trigger\n", type); | |
1811 | type = IRQ_TYPE_NONE; | |
1812 | } | |
332e99d5 | 1813 | |
14250520 LW |
1814 | gpiochip->irqchip = irqchip; |
1815 | gpiochip->irq_handler = handler; | |
1816 | gpiochip->irq_default_type = type; | |
1817 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 1818 | gpiochip->lock_key = lock_key; |
14250520 LW |
1819 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
1820 | gpiochip->ngpio, first_irq, | |
1821 | &gpiochip_domain_ops, gpiochip); | |
1822 | if (!gpiochip->irqdomain) { | |
1823 | gpiochip->irqchip = NULL; | |
1824 | return -EINVAL; | |
1825 | } | |
8b67a1f0 RV |
1826 | |
1827 | /* | |
1828 | * It is possible for a driver to override this, but only if the | |
1829 | * alternative functions are both implemented. | |
1830 | */ | |
1831 | if (!irqchip->irq_request_resources && | |
1832 | !irqchip->irq_release_resources) { | |
1833 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1834 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1835 | } | |
14250520 | 1836 | |
afa82fab MW |
1837 | acpi_gpiochip_request_interrupts(gpiochip); |
1838 | ||
14250520 LW |
1839 | return 0; |
1840 | } | |
739e6f59 | 1841 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key); |
14250520 LW |
1842 | |
1843 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
1844 | ||
1845 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
79b804cb MW |
1846 | static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1847 | { | |
1848 | return 0; | |
1849 | } | |
1850 | static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1851 | { } | |
14250520 LW |
1852 | |
1853 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
1854 | ||
c771c2f4 JG |
1855 | /** |
1856 | * gpiochip_generic_request() - request the gpio function for a pin | |
1857 | * @chip: the gpiochip owning the GPIO | |
1858 | * @offset: the offset of the GPIO to request for GPIO function | |
1859 | */ | |
1860 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
1861 | { | |
fdeb8e15 | 1862 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1863 | } |
1864 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
1865 | ||
1866 | /** | |
1867 | * gpiochip_generic_free() - free the gpio function from a pin | |
1868 | * @chip: the gpiochip to request the gpio function for | |
1869 | * @offset: the offset of the GPIO to free from GPIO function | |
1870 | */ | |
1871 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
1872 | { | |
fdeb8e15 | 1873 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
c771c2f4 JG |
1874 | } |
1875 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
1876 | ||
2956b5d9 MW |
1877 | /** |
1878 | * gpiochip_generic_config() - apply configuration for a pin | |
1879 | * @chip: the gpiochip owning the GPIO | |
1880 | * @offset: the offset of the GPIO to apply the configuration | |
1881 | * @config: the configuration to be applied | |
1882 | */ | |
1883 | int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset, | |
1884 | unsigned long config) | |
1885 | { | |
1886 | return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config); | |
1887 | } | |
1888 | EXPORT_SYMBOL_GPL(gpiochip_generic_config); | |
1889 | ||
f23f1516 | 1890 | #ifdef CONFIG_PINCTRL |
165adc9c | 1891 | |
586a87e6 CR |
1892 | /** |
1893 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
1894 | * @chip: the gpiochip to add the range for | |
d32651f6 | 1895 | * @pctldev: the pin controller to map to |
586a87e6 CR |
1896 | * @gpio_offset: the start offset in the current gpio_chip number space |
1897 | * @pin_group: name of the pin group inside the pin controller | |
1898 | */ | |
1899 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
1900 | struct pinctrl_dev *pctldev, | |
1901 | unsigned int gpio_offset, const char *pin_group) | |
1902 | { | |
1903 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1904 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
1905 | int ret; |
1906 | ||
1907 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
1908 | if (!pin_range) { | |
1a2a99c6 | 1909 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
1910 | return -ENOMEM; |
1911 | } | |
1912 | ||
1913 | /* Use local offset as range ID */ | |
1914 | pin_range->range.id = gpio_offset; | |
1915 | pin_range->range.gc = chip; | |
1916 | pin_range->range.name = chip->label; | |
fdeb8e15 | 1917 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
1918 | pin_range->pctldev = pctldev; |
1919 | ||
1920 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
1921 | &pin_range->range.pins, | |
1922 | &pin_range->range.npins); | |
61c6375d MN |
1923 | if (ret < 0) { |
1924 | kfree(pin_range); | |
586a87e6 | 1925 | return ret; |
61c6375d | 1926 | } |
586a87e6 CR |
1927 | |
1928 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
1929 | ||
1a2a99c6 AS |
1930 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
1931 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
1932 | pinctrl_dev_get_devname(pctldev), pin_group); |
1933 | ||
20ec3e39 | 1934 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
1935 | |
1936 | return 0; | |
1937 | } | |
1938 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
1939 | ||
3f0f8670 LW |
1940 | /** |
1941 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
1942 | * @chip: the gpiochip to add the range for | |
950d55f5 | 1943 | * @pinctl_name: the dev_name() of the pin controller to map to |
316511c0 LW |
1944 | * @gpio_offset: the start offset in the current gpio_chip number space |
1945 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
1946 | * @npins: the number of pins from the offset of each pin space (GPIO and |
1947 | * pin controller) to accumulate in this range | |
950d55f5 TR |
1948 | * |
1949 | * Returns: | |
1950 | * 0 on success, or a negative error-code on failure. | |
3f0f8670 | 1951 | */ |
1e63d7b9 | 1952 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 1953 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 1954 | unsigned int npins) |
f23f1516 SH |
1955 | { |
1956 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 1957 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 1958 | int ret; |
f23f1516 | 1959 | |
3f0f8670 | 1960 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 1961 | if (!pin_range) { |
1a2a99c6 | 1962 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 1963 | return -ENOMEM; |
f23f1516 SH |
1964 | } |
1965 | ||
3f0f8670 | 1966 | /* Use local offset as range ID */ |
316511c0 | 1967 | pin_range->range.id = gpio_offset; |
3f0f8670 | 1968 | pin_range->range.gc = chip; |
f23f1516 | 1969 | pin_range->range.name = chip->label; |
fdeb8e15 | 1970 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 1971 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 1972 | pin_range->range.npins = npins; |
192c369c | 1973 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 1974 | &pin_range->range); |
8f23ca1a | 1975 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 1976 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 1977 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 1978 | kfree(pin_range); |
b4d4b1f0 | 1979 | return ret; |
3f0f8670 | 1980 | } |
1a2a99c6 AS |
1981 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
1982 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
1983 | pinctl_name, |
1984 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 1985 | |
20ec3e39 | 1986 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
1987 | |
1988 | return 0; | |
f23f1516 | 1989 | } |
165adc9c | 1990 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 1991 | |
3f0f8670 LW |
1992 | /** |
1993 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
1994 | * @chip: the chip to remove all the mappings for | |
1995 | */ | |
f23f1516 SH |
1996 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
1997 | { | |
1998 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 1999 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 2000 | |
20ec3e39 | 2001 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
2002 | list_del(&pin_range->node); |
2003 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
2004 | &pin_range->range); | |
3f0f8670 | 2005 | kfree(pin_range); |
f23f1516 SH |
2006 | } |
2007 | } | |
165adc9c LW |
2008 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
2009 | ||
2010 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 2011 | |
d2876d08 DB |
2012 | /* These "optional" allocation calls help prevent drivers from stomping |
2013 | * on each other, and help provide better diagnostics in debugfs. | |
2014 | * They're called even less than the "set direction" calls. | |
2015 | */ | |
fac9d885 | 2016 | static int gpiod_request_commit(struct gpio_desc *desc, const char *label) |
d2876d08 | 2017 | { |
fdeb8e15 | 2018 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 2019 | int status; |
d2876d08 DB |
2020 | unsigned long flags; |
2021 | ||
bcabdef1 AC |
2022 | spin_lock_irqsave(&gpio_lock, flags); |
2023 | ||
d2876d08 | 2024 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 2025 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
2026 | */ |
2027 | ||
2028 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
2029 | desc_set_label(desc, label ? : "?"); | |
2030 | status = 0; | |
438d8908 | 2031 | } else { |
d2876d08 | 2032 | status = -EBUSY; |
7460db56 | 2033 | goto done; |
35e8bb51 DB |
2034 | } |
2035 | ||
2036 | if (chip->request) { | |
2037 | /* chip->request may sleep */ | |
2038 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 2039 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2040 | spin_lock_irqsave(&gpio_lock, flags); |
2041 | ||
2042 | if (status < 0) { | |
2043 | desc_set_label(desc, NULL); | |
35e8bb51 | 2044 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 2045 | goto done; |
35e8bb51 | 2046 | } |
438d8908 | 2047 | } |
80b0a602 MN |
2048 | if (chip->get_direction) { |
2049 | /* chip->get_direction may sleep */ | |
2050 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 2051 | gpiod_get_direction(desc); |
80b0a602 MN |
2052 | spin_lock_irqsave(&gpio_lock, flags); |
2053 | } | |
77c2d792 MW |
2054 | done: |
2055 | spin_unlock_irqrestore(&gpio_lock, flags); | |
2056 | return status; | |
2057 | } | |
2058 | ||
fdeb8e15 LW |
2059 | /* |
2060 | * This descriptor validation needs to be inserted verbatim into each | |
2061 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
2062 | * macro to avoid endless duplication. If the desc is NULL it is an |
2063 | * optional GPIO and calls should just bail out. | |
fdeb8e15 LW |
2064 | */ |
2065 | #define VALIDATE_DESC(desc) do { \ | |
54d77198 LW |
2066 | if (!desc) \ |
2067 | return 0; \ | |
bfbbe44d LW |
2068 | if (IS_ERR(desc)) { \ |
2069 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
2070 | return PTR_ERR(desc); \ | |
2071 | } \ | |
54d77198 | 2072 | if (!desc->gdev) { \ |
bfbbe44d | 2073 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
2074 | return -EINVAL; \ |
2075 | } \ | |
2076 | if ( !desc->gdev->chip ) { \ | |
2077 | dev_warn(&desc->gdev->dev, \ | |
2078 | "%s: backing chip is gone\n", __func__); \ | |
2079 | return 0; \ | |
2080 | } } while (0) | |
2081 | ||
2082 | #define VALIDATE_DESC_VOID(desc) do { \ | |
54d77198 LW |
2083 | if (!desc) \ |
2084 | return; \ | |
bfbbe44d LW |
2085 | if (IS_ERR(desc)) { \ |
2086 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ | |
2087 | return; \ | |
2088 | } \ | |
54d77198 | 2089 | if (!desc->gdev) { \ |
bfbbe44d | 2090 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
fdeb8e15 LW |
2091 | return; \ |
2092 | } \ | |
2093 | if (!desc->gdev->chip) { \ | |
2094 | dev_warn(&desc->gdev->dev, \ | |
2095 | "%s: backing chip is gone\n", __func__); \ | |
2096 | return; \ | |
2097 | } } while (0) | |
2098 | ||
2099 | ||
0eb4c6c2 | 2100 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
2101 | { |
2102 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 2103 | struct gpio_device *gdev; |
77c2d792 | 2104 | |
fdeb8e15 LW |
2105 | VALIDATE_DESC(desc); |
2106 | gdev = desc->gdev; | |
77c2d792 | 2107 | |
fdeb8e15 | 2108 | if (try_module_get(gdev->owner)) { |
fac9d885 | 2109 | status = gpiod_request_commit(desc, label); |
77c2d792 | 2110 | if (status < 0) |
fdeb8e15 | 2111 | module_put(gdev->owner); |
33a68e86 LW |
2112 | else |
2113 | get_device(&gdev->dev); | |
77c2d792 MW |
2114 | } |
2115 | ||
d2876d08 | 2116 | if (status) |
7589e59f | 2117 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 2118 | |
d2876d08 DB |
2119 | return status; |
2120 | } | |
372e722e | 2121 | |
fac9d885 | 2122 | static bool gpiod_free_commit(struct gpio_desc *desc) |
d2876d08 | 2123 | { |
77c2d792 | 2124 | bool ret = false; |
d2876d08 | 2125 | unsigned long flags; |
35e8bb51 | 2126 | struct gpio_chip *chip; |
d2876d08 | 2127 | |
3d599d1c UKK |
2128 | might_sleep(); |
2129 | ||
372e722e | 2130 | gpiod_unexport(desc); |
d8f388d8 | 2131 | |
d2876d08 DB |
2132 | spin_lock_irqsave(&gpio_lock, flags); |
2133 | ||
fdeb8e15 | 2134 | chip = desc->gdev->chip; |
35e8bb51 DB |
2135 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
2136 | if (chip->free) { | |
2137 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 2138 | might_sleep_if(chip->can_sleep); |
372e722e | 2139 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2140 | spin_lock_irqsave(&gpio_lock, flags); |
2141 | } | |
d2876d08 | 2142 | desc_set_label(desc, NULL); |
07697461 | 2143 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 2144 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 2145 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 2146 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 2147 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
2148 | ret = true; |
2149 | } | |
d2876d08 DB |
2150 | |
2151 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
2152 | return ret; |
2153 | } | |
2154 | ||
0eb4c6c2 | 2155 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 2156 | { |
fac9d885 | 2157 | if (desc && desc->gdev && gpiod_free_commit(desc)) { |
fdeb8e15 | 2158 | module_put(desc->gdev->owner); |
33a68e86 LW |
2159 | put_device(&desc->gdev->dev); |
2160 | } else { | |
77c2d792 | 2161 | WARN_ON(extra_checks); |
33a68e86 | 2162 | } |
d2876d08 | 2163 | } |
372e722e | 2164 | |
d2876d08 DB |
2165 | /** |
2166 | * gpiochip_is_requested - return string iff signal was requested | |
2167 | * @chip: controller managing the signal | |
2168 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
2169 | * | |
2170 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
2171 | * The string returned is the label passed to gpio_request(); if none has been |
2172 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
2173 | * |
2174 | * This function is for use by GPIO controller drivers. The label can | |
2175 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
2176 | * can help avoid accidentally multiplexing it to another controller. | |
2177 | */ | |
2178 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
2179 | { | |
6c0b4e6c | 2180 | struct gpio_desc *desc; |
d2876d08 | 2181 | |
48b5953e | 2182 | if (offset >= chip->ngpio) |
d2876d08 | 2183 | return NULL; |
6c0b4e6c | 2184 | |
1c3cdb18 | 2185 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 2186 | |
372e722e | 2187 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 2188 | return NULL; |
372e722e | 2189 | return desc->label; |
d2876d08 DB |
2190 | } |
2191 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
2192 | ||
77c2d792 MW |
2193 | /** |
2194 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
950d55f5 TR |
2195 | * @chip: GPIO chip |
2196 | * @hwnum: hardware number of the GPIO for which to request the descriptor | |
77c2d792 MW |
2197 | * @label: label for the GPIO |
2198 | * | |
2199 | * Function allows GPIO chip drivers to request and use their own GPIO | |
2200 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
2201 | * function will not increase reference count of the GPIO chip module. This | |
2202 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
2203 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
950d55f5 TR |
2204 | * |
2205 | * Returns: | |
2206 | * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error | |
2207 | * code on failure. | |
77c2d792 | 2208 | */ |
abdc08a3 AC |
2209 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
2210 | const char *label) | |
77c2d792 | 2211 | { |
abdc08a3 AC |
2212 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
2213 | int err; | |
77c2d792 | 2214 | |
abdc08a3 AC |
2215 | if (IS_ERR(desc)) { |
2216 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
2217 | return desc; | |
2218 | } | |
2219 | ||
fac9d885 | 2220 | err = gpiod_request_commit(desc, label); |
abdc08a3 AC |
2221 | if (err < 0) |
2222 | return ERR_PTR(err); | |
77c2d792 | 2223 | |
abdc08a3 | 2224 | return desc; |
77c2d792 | 2225 | } |
f7d4ad98 | 2226 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
2227 | |
2228 | /** | |
2229 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
2230 | * @desc: GPIO descriptor to free | |
2231 | * | |
2232 | * Function frees the given GPIO requested previously with | |
2233 | * gpiochip_request_own_desc(). | |
2234 | */ | |
2235 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
2236 | { | |
2237 | if (desc) | |
fac9d885 | 2238 | gpiod_free_commit(desc); |
77c2d792 | 2239 | } |
f7d4ad98 | 2240 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 2241 | |
fdeb8e15 LW |
2242 | /* |
2243 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
2244 | * some cases this is done in early boot, before IRQs are enabled. |
2245 | * | |
2246 | * As a rule these aren't called more than once (except for drivers | |
2247 | * using the open-drain emulation idiom) so these are natural places | |
2248 | * to accumulate extra debugging checks. Note that we can't (yet) | |
2249 | * rely on gpio_request() having been called beforehand. | |
2250 | */ | |
2251 | ||
79a9becd AC |
2252 | /** |
2253 | * gpiod_direction_input - set the GPIO direction to input | |
2254 | * @desc: GPIO to set to input | |
2255 | * | |
2256 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
2257 | * be called safely on it. | |
2258 | * | |
2259 | * Return 0 in case of success, else an error code. | |
2260 | */ | |
2261 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 2262 | { |
d2876d08 | 2263 | struct gpio_chip *chip; |
d2876d08 DB |
2264 | int status = -EINVAL; |
2265 | ||
fdeb8e15 LW |
2266 | VALIDATE_DESC(desc); |
2267 | chip = desc->gdev->chip; | |
bcabdef1 | 2268 | |
be1a4b13 | 2269 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
2270 | gpiod_warn(desc, |
2271 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 2272 | __func__); |
be1a4b13 LW |
2273 | return -EIO; |
2274 | } | |
2275 | ||
d82da797 | 2276 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
2277 | if (status == 0) |
2278 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 2279 | |
372e722e | 2280 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 2281 | |
d2876d08 DB |
2282 | return status; |
2283 | } | |
79a9becd | 2284 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 2285 | |
2956b5d9 MW |
2286 | static int gpio_set_drive_single_ended(struct gpio_chip *gc, unsigned offset, |
2287 | enum pin_config_param mode) | |
2288 | { | |
2289 | unsigned long config = { PIN_CONF_PACKED(mode, 0) }; | |
2290 | ||
2291 | return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP; | |
2292 | } | |
2293 | ||
fac9d885 | 2294 | static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) |
d2876d08 | 2295 | { |
c663e5f5 | 2296 | struct gpio_chip *gc = desc->gdev->chip; |
ad17731d | 2297 | int val = !!value; |
c663e5f5 | 2298 | int ret; |
d2876d08 | 2299 | |
c663e5f5 | 2300 | if (!gc->set || !gc->direction_output) { |
6424de5a MB |
2301 | gpiod_warn(desc, |
2302 | "%s: missing set() or direction_output() operations\n", | |
2303 | __func__); | |
be1a4b13 LW |
2304 | return -EIO; |
2305 | } | |
2306 | ||
ad17731d | 2307 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val); |
c663e5f5 | 2308 | if (!ret) |
d2876d08 | 2309 | set_bit(FLAG_IS_OUT, &desc->flags); |
ad17731d | 2310 | trace_gpio_value(desc_to_gpio(desc), 0, val); |
c663e5f5 LW |
2311 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
2312 | return ret; | |
d2876d08 | 2313 | } |
ef70bbe1 PZ |
2314 | |
2315 | /** | |
2316 | * gpiod_direction_output_raw - set the GPIO direction to output | |
2317 | * @desc: GPIO to set to output | |
2318 | * @value: initial output value of the GPIO | |
2319 | * | |
2320 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2321 | * be called safely on it. The initial value of the output must be specified | |
2322 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
2323 | * | |
2324 | * Return 0 in case of success, else an error code. | |
2325 | */ | |
2326 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
2327 | { | |
fdeb8e15 | 2328 | VALIDATE_DESC(desc); |
fac9d885 | 2329 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 PZ |
2330 | } |
2331 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
2332 | ||
2333 | /** | |
90df4fe0 | 2334 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
2335 | * @desc: GPIO to set to output |
2336 | * @value: initial output value of the GPIO | |
2337 | * | |
2338 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2339 | * be called safely on it. The initial value of the output must be specified | |
2340 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2341 | * account. | |
2342 | * | |
2343 | * Return 0 in case of success, else an error code. | |
2344 | */ | |
2345 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
2346 | { | |
02e47980 LW |
2347 | struct gpio_chip *gc = desc->gdev->chip; |
2348 | int ret; | |
2349 | ||
fdeb8e15 | 2350 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2351 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2352 | value = !value; | |
ad17731d LW |
2353 | else |
2354 | value = !!value; | |
02e47980 LW |
2355 | |
2356 | /* GPIOs used for IRQs shall not be set as output */ | |
2357 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
2358 | gpiod_err(desc, | |
2359 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
2360 | __func__); | |
2361 | return -EIO; | |
2362 | } | |
2363 | ||
2364 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
2365 | /* First see if we can enable open drain in hardware */ | |
2366 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2367 | PIN_CONFIG_DRIVE_OPEN_DRAIN); | |
2368 | if (!ret) | |
2369 | goto set_output_value; | |
2370 | /* Emulate open drain by not actively driving the line high */ | |
2371 | if (value) | |
2372 | return gpiod_direction_input(desc); | |
2373 | } | |
2374 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
2375 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2376 | PIN_CONFIG_DRIVE_OPEN_SOURCE); | |
2377 | if (!ret) | |
2378 | goto set_output_value; | |
2379 | /* Emulate open source by not actively driving the line low */ | |
2380 | if (!value) | |
2381 | return gpiod_direction_input(desc); | |
2382 | } else { | |
2383 | gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2384 | PIN_CONFIG_DRIVE_PUSH_PULL); | |
2385 | } | |
2386 | ||
2387 | set_output_value: | |
fac9d885 | 2388 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 | 2389 | } |
79a9becd | 2390 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 2391 | |
c4b5be98 | 2392 | /** |
950d55f5 TR |
2393 | * gpiod_set_debounce - sets @debounce time for a GPIO |
2394 | * @desc: descriptor of the GPIO for which to set debounce time | |
2395 | * @debounce: debounce time in microseconds | |
65d87656 | 2396 | * |
950d55f5 TR |
2397 | * Returns: |
2398 | * 0 on success, %-ENOTSUPP if the controller doesn't support setting the | |
2399 | * debounce time. | |
c4b5be98 | 2400 | */ |
79a9becd | 2401 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 2402 | { |
c4b5be98 | 2403 | struct gpio_chip *chip; |
2956b5d9 | 2404 | unsigned long config; |
c4b5be98 | 2405 | |
fdeb8e15 LW |
2406 | VALIDATE_DESC(desc); |
2407 | chip = desc->gdev->chip; | |
2956b5d9 | 2408 | if (!chip->set || !chip->set_config) { |
6424de5a | 2409 | gpiod_dbg(desc, |
2956b5d9 | 2410 | "%s: missing set() or set_config() operations\n", |
6424de5a | 2411 | __func__); |
65d87656 | 2412 | return -ENOTSUPP; |
be1a4b13 LW |
2413 | } |
2414 | ||
2956b5d9 MW |
2415 | config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce); |
2416 | return chip->set_config(chip, gpio_chip_hwgpio(desc), config); | |
c4b5be98 | 2417 | } |
79a9becd | 2418 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 2419 | |
79a9becd AC |
2420 | /** |
2421 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
2422 | * @desc: the gpio descriptor to test | |
2423 | * | |
2424 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
2425 | */ | |
2426 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 2427 | { |
fdeb8e15 | 2428 | VALIDATE_DESC(desc); |
79a9becd | 2429 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 2430 | } |
79a9becd | 2431 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
2432 | |
2433 | /* I/O calls are only valid after configuration completed; the relevant | |
2434 | * "is this a valid GPIO" error checks should already have been done. | |
2435 | * | |
2436 | * "Get" operations are often inlinable as reading a pin value register, | |
2437 | * and masking the relevant bit in that register. | |
2438 | * | |
2439 | * When "set" operations are inlinable, they involve writing that mask to | |
2440 | * one register to set a low value, or a different register to set it high. | |
2441 | * Otherwise locking is needed, so there may be little value to inlining. | |
2442 | * | |
2443 | *------------------------------------------------------------------------ | |
2444 | * | |
2445 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
2446 | * have requested the GPIO. That can include implicit requesting by | |
2447 | * a direction setting call. Marking a gpio as requested locks its chip | |
2448 | * in memory, guaranteeing that these table lookups need no more locking | |
2449 | * and that gpiochip_remove() will fail. | |
2450 | * | |
2451 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
2452 | * that the GPIO was actually requested. | |
2453 | */ | |
2454 | ||
fac9d885 | 2455 | static int gpiod_get_raw_value_commit(const struct gpio_desc *desc) |
d2876d08 DB |
2456 | { |
2457 | struct gpio_chip *chip; | |
372e722e | 2458 | int offset; |
e20538b8 | 2459 | int value; |
d2876d08 | 2460 | |
fdeb8e15 | 2461 | chip = desc->gdev->chip; |
372e722e | 2462 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 2463 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 2464 | value = value < 0 ? value : !!value; |
372e722e | 2465 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 2466 | return value; |
d2876d08 | 2467 | } |
372e722e | 2468 | |
d2876d08 | 2469 | /** |
79a9becd AC |
2470 | * gpiod_get_raw_value() - return a gpio's raw value |
2471 | * @desc: gpio whose value will be returned | |
d2876d08 | 2472 | * |
79a9becd | 2473 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 2474 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2475 | * |
2476 | * This function should be called from contexts where we cannot sleep, and will | |
2477 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2478 | */ |
79a9becd | 2479 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 2480 | { |
fdeb8e15 | 2481 | VALIDATE_DESC(desc); |
e4e449e8 | 2482 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2483 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 2484 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 2485 | } |
79a9becd | 2486 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 2487 | |
79a9becd AC |
2488 | /** |
2489 | * gpiod_get_value() - return a gpio's value | |
2490 | * @desc: gpio whose value will be returned | |
2491 | * | |
2492 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2493 | * account, or negative errno on failure. |
79a9becd AC |
2494 | * |
2495 | * This function should be called from contexts where we cannot sleep, and will | |
2496 | * complain if the GPIO chip functions potentially sleep. | |
2497 | */ | |
2498 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 2499 | { |
79a9becd | 2500 | int value; |
fdeb8e15 LW |
2501 | |
2502 | VALIDATE_DESC(desc); | |
79a9becd | 2503 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2504 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2505 | |
fac9d885 | 2506 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
2507 | if (value < 0) |
2508 | return value; | |
2509 | ||
79a9becd AC |
2510 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2511 | value = !value; | |
2512 | ||
2513 | return value; | |
372e722e | 2514 | } |
79a9becd | 2515 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 2516 | |
aca5ce14 | 2517 | /* |
fac9d885 | 2518 | * gpio_set_open_drain_value_commit() - Set the open drain gpio's value. |
79a9becd | 2519 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 2520 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 2521 | */ |
fac9d885 | 2522 | static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
2523 | { |
2524 | int err = 0; | |
fdeb8e15 | 2525 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2526 | int offset = gpio_chip_hwgpio(desc); |
2527 | ||
aca5ce14 | 2528 | if (value) { |
372e722e | 2529 | err = chip->direction_input(chip, offset); |
aca5ce14 | 2530 | if (!err) |
372e722e | 2531 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2532 | } else { |
372e722e | 2533 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 2534 | if (!err) |
372e722e | 2535 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 2536 | } |
372e722e | 2537 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 2538 | if (err < 0) |
6424de5a MB |
2539 | gpiod_err(desc, |
2540 | "%s: Error in set_value for open drain err %d\n", | |
2541 | __func__, err); | |
aca5ce14 LD |
2542 | } |
2543 | ||
25553ff0 | 2544 | /* |
79a9becd AC |
2545 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
2546 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 2547 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 2548 | */ |
fac9d885 | 2549 | static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value) |
25553ff0 LD |
2550 | { |
2551 | int err = 0; | |
fdeb8e15 | 2552 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
2553 | int offset = gpio_chip_hwgpio(desc); |
2554 | ||
25553ff0 | 2555 | if (value) { |
372e722e | 2556 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 2557 | if (!err) |
372e722e | 2558 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2559 | } else { |
372e722e | 2560 | err = chip->direction_input(chip, offset); |
25553ff0 | 2561 | if (!err) |
372e722e | 2562 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 2563 | } |
372e722e | 2564 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 2565 | if (err < 0) |
6424de5a MB |
2566 | gpiod_err(desc, |
2567 | "%s: Error in set_value for open source err %d\n", | |
2568 | __func__, err); | |
25553ff0 LD |
2569 | } |
2570 | ||
fac9d885 | 2571 | static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value) |
d2876d08 DB |
2572 | { |
2573 | struct gpio_chip *chip; | |
2574 | ||
fdeb8e15 | 2575 | chip = desc->gdev->chip; |
372e722e | 2576 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
02e47980 | 2577 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
372e722e AC |
2578 | } |
2579 | ||
5f424243 RI |
2580 | /* |
2581 | * set multiple outputs on the same chip; | |
2582 | * use the chip's set_multiple function if available; | |
2583 | * otherwise set the outputs sequentially; | |
2584 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
2585 | * defines which outputs are to be changed | |
2586 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
2587 | * defines the values the outputs specified by mask are to be set to | |
2588 | */ | |
2589 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
2590 | unsigned long *mask, unsigned long *bits) | |
2591 | { | |
2592 | if (chip->set_multiple) { | |
2593 | chip->set_multiple(chip, mask, bits); | |
2594 | } else { | |
5e4e6fb3 AS |
2595 | unsigned int i; |
2596 | ||
2597 | /* set outputs if the corresponding mask bit is set */ | |
2598 | for_each_set_bit(i, mask, chip->ngpio) | |
2599 | chip->set(chip, i, test_bit(i, bits)); | |
5f424243 RI |
2600 | } |
2601 | } | |
2602 | ||
44c7288f LW |
2603 | void gpiod_set_array_value_complex(bool raw, bool can_sleep, |
2604 | unsigned int array_size, | |
2605 | struct gpio_desc **desc_array, | |
2606 | int *value_array) | |
5f424243 RI |
2607 | { |
2608 | int i = 0; | |
2609 | ||
2610 | while (i < array_size) { | |
fdeb8e15 | 2611 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
5f424243 RI |
2612 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
2613 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
2614 | int count = 0; | |
2615 | ||
38e003f4 | 2616 | if (!can_sleep) |
5f424243 | 2617 | WARN_ON(chip->can_sleep); |
38e003f4 | 2618 | |
5f424243 RI |
2619 | memset(mask, 0, sizeof(mask)); |
2620 | do { | |
2621 | struct gpio_desc *desc = desc_array[i]; | |
2622 | int hwgpio = gpio_chip_hwgpio(desc); | |
2623 | int value = value_array[i]; | |
2624 | ||
2625 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2626 | value = !value; | |
2627 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
2628 | /* | |
2629 | * collect all normal outputs belonging to the same chip | |
2630 | * open drain and open source outputs are set individually | |
2631 | */ | |
02e47980 | 2632 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) { |
fac9d885 | 2633 | gpio_set_open_drain_value_commit(desc, value); |
02e47980 | 2634 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) { |
fac9d885 | 2635 | gpio_set_open_source_value_commit(desc, value); |
5f424243 RI |
2636 | } else { |
2637 | __set_bit(hwgpio, mask); | |
38e003f4 | 2638 | if (value) |
5f424243 | 2639 | __set_bit(hwgpio, bits); |
38e003f4 | 2640 | else |
5f424243 | 2641 | __clear_bit(hwgpio, bits); |
5f424243 RI |
2642 | count++; |
2643 | } | |
2644 | i++; | |
fdeb8e15 LW |
2645 | } while ((i < array_size) && |
2646 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 2647 | /* push collected bits to outputs */ |
38e003f4 | 2648 | if (count != 0) |
5f424243 | 2649 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
2650 | } |
2651 | } | |
2652 | ||
d2876d08 | 2653 | /** |
79a9becd AC |
2654 | * gpiod_set_raw_value() - assign a gpio's raw value |
2655 | * @desc: gpio whose value will be assigned | |
d2876d08 | 2656 | * @value: value to assign |
d2876d08 | 2657 | * |
79a9becd AC |
2658 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
2659 | * regard for its ACTIVE_LOW status. | |
2660 | * | |
2661 | * This function should be called from contexts where we cannot sleep, and will | |
2662 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2663 | */ |
79a9becd | 2664 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 2665 | { |
fdeb8e15 | 2666 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2667 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2668 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 2669 | gpiod_set_raw_value_commit(desc, value); |
d2876d08 | 2670 | } |
79a9becd | 2671 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
2672 | |
2673 | /** | |
79a9becd AC |
2674 | * gpiod_set_value() - assign a gpio's value |
2675 | * @desc: gpio whose value will be assigned | |
2676 | * @value: value to assign | |
2677 | * | |
02e47980 LW |
2678 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW, |
2679 | * OPEN_DRAIN and OPEN_SOURCE flags into account. | |
d2876d08 | 2680 | * |
79a9becd AC |
2681 | * This function should be called from contexts where we cannot sleep, and will |
2682 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2683 | */ |
79a9becd | 2684 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 2685 | { |
fdeb8e15 | 2686 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 2687 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 2688 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd AC |
2689 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2690 | value = !value; | |
02e47980 LW |
2691 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
2692 | gpio_set_open_drain_value_commit(desc, value); | |
2693 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
2694 | gpio_set_open_source_value_commit(desc, value); | |
2695 | else | |
2696 | gpiod_set_raw_value_commit(desc, value); | |
372e722e | 2697 | } |
79a9becd | 2698 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 2699 | |
5f424243 | 2700 | /** |
3fff99bc | 2701 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2702 | * @array_size: number of elements in the descriptor / value arrays |
2703 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2704 | * @value_array: array of values to assign | |
2705 | * | |
2706 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2707 | * without regard for their ACTIVE_LOW status. | |
2708 | * | |
2709 | * This function should be called from contexts where we cannot sleep, and will | |
2710 | * complain if the GPIO chip functions potentially sleep. | |
2711 | */ | |
3fff99bc | 2712 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
2713 | struct gpio_desc **desc_array, int *value_array) |
2714 | { | |
2715 | if (!desc_array) | |
2716 | return; | |
44c7288f LW |
2717 | gpiod_set_array_value_complex(true, false, array_size, desc_array, |
2718 | value_array); | |
5f424243 | 2719 | } |
3fff99bc | 2720 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
2721 | |
2722 | /** | |
3fff99bc | 2723 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
2724 | * @array_size: number of elements in the descriptor / value arrays |
2725 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2726 | * @value_array: array of values to assign | |
2727 | * | |
2728 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
2729 | * into account. | |
2730 | * | |
2731 | * This function should be called from contexts where we cannot sleep, and will | |
2732 | * complain if the GPIO chip functions potentially sleep. | |
2733 | */ | |
3fff99bc RI |
2734 | void gpiod_set_array_value(unsigned int array_size, |
2735 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
2736 | { |
2737 | if (!desc_array) | |
2738 | return; | |
44c7288f LW |
2739 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
2740 | value_array); | |
5f424243 | 2741 | } |
3fff99bc | 2742 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 2743 | |
d2876d08 | 2744 | /** |
79a9becd AC |
2745 | * gpiod_cansleep() - report whether gpio value access may sleep |
2746 | * @desc: gpio to check | |
d2876d08 | 2747 | * |
d2876d08 | 2748 | */ |
79a9becd | 2749 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 2750 | { |
fdeb8e15 LW |
2751 | VALIDATE_DESC(desc); |
2752 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 2753 | } |
79a9becd | 2754 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 2755 | |
0f6d504e | 2756 | /** |
79a9becd AC |
2757 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
2758 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 2759 | * |
79a9becd AC |
2760 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
2761 | * error. | |
0f6d504e | 2762 | */ |
79a9becd | 2763 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 2764 | { |
4c37ce86 LW |
2765 | struct gpio_chip *chip; |
2766 | int offset; | |
0f6d504e | 2767 | |
79bb71bd LW |
2768 | /* |
2769 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
2770 | * requires this function to not return zero on an invalid descriptor | |
2771 | * but rather a negative error number. | |
2772 | */ | |
bfbbe44d | 2773 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
2774 | return -EINVAL; |
2775 | ||
fdeb8e15 | 2776 | chip = desc->gdev->chip; |
372e722e | 2777 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
2778 | if (chip->to_irq) { |
2779 | int retirq = chip->to_irq(chip, offset); | |
2780 | ||
2781 | /* Zero means NO_IRQ */ | |
2782 | if (!retirq) | |
2783 | return -ENXIO; | |
2784 | ||
2785 | return retirq; | |
2786 | } | |
2787 | return -ENXIO; | |
0f6d504e | 2788 | } |
79a9becd | 2789 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 2790 | |
d468bf9e | 2791 | /** |
e3a2e878 | 2792 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
2793 | * @chip: the chip the GPIO to lock belongs to |
2794 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2795 | * |
2796 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 2797 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 2798 | */ |
e3a2e878 | 2799 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 2800 | { |
9c10280d LW |
2801 | struct gpio_desc *desc; |
2802 | ||
2803 | desc = gpiochip_get_desc(chip, offset); | |
2804 | if (IS_ERR(desc)) | |
2805 | return PTR_ERR(desc); | |
2806 | ||
60f8339e LW |
2807 | /* |
2808 | * If it's fast: flush the direction setting if something changed | |
2809 | * behind our back | |
2810 | */ | |
2811 | if (!chip->can_sleep && chip->get_direction) { | |
9c10280d LW |
2812 | int dir = chip->get_direction(chip, offset); |
2813 | ||
2814 | if (dir) | |
2815 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
2816 | else | |
2817 | set_bit(FLAG_IS_OUT, &desc->flags); | |
2818 | } | |
d468bf9e | 2819 | |
9c10280d | 2820 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 2821 | chip_err(chip, |
d468bf9e LW |
2822 | "%s: tried to flag a GPIO set as output for IRQ\n", |
2823 | __func__); | |
2824 | return -EIO; | |
2825 | } | |
2826 | ||
9c10280d | 2827 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
3940c34a LW |
2828 | |
2829 | /* | |
2830 | * If the consumer has not set up a label (such as when the | |
2831 | * IRQ is referenced from .to_irq()) we set up a label here | |
2832 | * so it is clear this is used as an interrupt. | |
2833 | */ | |
2834 | if (!desc->label) | |
2835 | desc_set_label(desc, "interrupt"); | |
2836 | ||
d468bf9e | 2837 | return 0; |
372e722e | 2838 | } |
e3a2e878 | 2839 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 2840 | |
d468bf9e | 2841 | /** |
e3a2e878 | 2842 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
2843 | * @chip: the chip the GPIO to lock belongs to |
2844 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
2845 | * |
2846 | * This is used directly by GPIO drivers that want to indicate | |
2847 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 2848 | */ |
e3a2e878 | 2849 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 2850 | { |
3940c34a LW |
2851 | struct gpio_desc *desc; |
2852 | ||
2853 | desc = gpiochip_get_desc(chip, offset); | |
2854 | if (IS_ERR(desc)) | |
d468bf9e | 2855 | return; |
d2876d08 | 2856 | |
3940c34a LW |
2857 | clear_bit(FLAG_USED_AS_IRQ, &desc->flags); |
2858 | ||
2859 | /* If we only had this marking, erase it */ | |
2860 | if (desc->label && !strcmp(desc->label, "interrupt")) | |
2861 | desc_set_label(desc, NULL); | |
d468bf9e | 2862 | } |
e3a2e878 | 2863 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 2864 | |
6cee3821 LW |
2865 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
2866 | { | |
2867 | if (offset >= chip->ngpio) | |
2868 | return false; | |
2869 | ||
2870 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
2871 | } | |
2872 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
2873 | ||
143b65d6 LW |
2874 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
2875 | { | |
2876 | if (offset >= chip->ngpio) | |
2877 | return false; | |
2878 | ||
2879 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
2880 | } | |
2881 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
2882 | ||
2883 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
2884 | { | |
2885 | if (offset >= chip->ngpio) | |
2886 | return false; | |
2887 | ||
2888 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
2889 | } | |
2890 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
2891 | ||
05f479bf CK |
2892 | bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset) |
2893 | { | |
2894 | if (offset >= chip->ngpio) | |
2895 | return false; | |
2896 | ||
2897 | return !test_bit(FLAG_SLEEP_MAY_LOOSE_VALUE, | |
2898 | &chip->gpiodev->descs[offset].flags); | |
2899 | } | |
2900 | EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); | |
2901 | ||
79a9becd AC |
2902 | /** |
2903 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
2904 | * @desc: gpio whose value will be returned | |
2905 | * | |
2906 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 2907 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2908 | * |
2909 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 2910 | */ |
79a9becd | 2911 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 2912 | { |
d2876d08 | 2913 | might_sleep_if(extra_checks); |
fdeb8e15 | 2914 | VALIDATE_DESC(desc); |
fac9d885 | 2915 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 2916 | } |
79a9becd | 2917 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 2918 | |
79a9becd AC |
2919 | /** |
2920 | * gpiod_get_value_cansleep() - return a gpio's value | |
2921 | * @desc: gpio whose value will be returned | |
2922 | * | |
2923 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2924 | * account, or negative errno on failure. |
79a9becd AC |
2925 | * |
2926 | * This function is to be called from contexts that can sleep. | |
2927 | */ | |
2928 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 2929 | { |
3f397c21 | 2930 | int value; |
d2876d08 DB |
2931 | |
2932 | might_sleep_if(extra_checks); | |
fdeb8e15 | 2933 | VALIDATE_DESC(desc); |
fac9d885 | 2934 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
2935 | if (value < 0) |
2936 | return value; | |
2937 | ||
79a9becd AC |
2938 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2939 | value = !value; | |
2940 | ||
3f397c21 | 2941 | return value; |
d2876d08 | 2942 | } |
79a9becd | 2943 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 2944 | |
79a9becd AC |
2945 | /** |
2946 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
2947 | * @desc: gpio whose value will be assigned | |
2948 | * @value: value to assign | |
2949 | * | |
2950 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
2951 | * regard for its ACTIVE_LOW status. | |
2952 | * | |
2953 | * This function is to be called from contexts that can sleep. | |
2954 | */ | |
2955 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 2956 | { |
d2876d08 | 2957 | might_sleep_if(extra_checks); |
fdeb8e15 | 2958 | VALIDATE_DESC_VOID(desc); |
fac9d885 | 2959 | gpiod_set_raw_value_commit(desc, value); |
372e722e | 2960 | } |
79a9becd | 2961 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 2962 | |
79a9becd AC |
2963 | /** |
2964 | * gpiod_set_value_cansleep() - assign a gpio's value | |
2965 | * @desc: gpio whose value will be assigned | |
2966 | * @value: value to assign | |
2967 | * | |
2968 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2969 | * account | |
2970 | * | |
2971 | * This function is to be called from contexts that can sleep. | |
2972 | */ | |
2973 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 2974 | { |
d2876d08 | 2975 | might_sleep_if(extra_checks); |
fdeb8e15 | 2976 | VALIDATE_DESC_VOID(desc); |
79a9becd AC |
2977 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2978 | value = !value; | |
fac9d885 | 2979 | gpiod_set_raw_value_commit(desc, value); |
372e722e | 2980 | } |
79a9becd | 2981 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 2982 | |
5f424243 | 2983 | /** |
3fff99bc | 2984 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
2985 | * @array_size: number of elements in the descriptor / value arrays |
2986 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
2987 | * @value_array: array of values to assign | |
2988 | * | |
2989 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
2990 | * without regard for their ACTIVE_LOW status. | |
2991 | * | |
2992 | * This function is to be called from contexts that can sleep. | |
2993 | */ | |
3fff99bc RI |
2994 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
2995 | struct gpio_desc **desc_array, | |
2996 | int *value_array) | |
5f424243 RI |
2997 | { |
2998 | might_sleep_if(extra_checks); | |
2999 | if (!desc_array) | |
3000 | return; | |
44c7288f LW |
3001 | gpiod_set_array_value_complex(true, true, array_size, desc_array, |
3002 | value_array); | |
5f424243 | 3003 | } |
3fff99bc | 3004 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 | 3005 | |
3946d187 DT |
3006 | /** |
3007 | * gpiod_add_lookup_tables() - register GPIO device consumers | |
3008 | * @tables: list of tables of consumers to register | |
3009 | * @n: number of tables in the list | |
3010 | */ | |
3011 | void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) | |
3012 | { | |
3013 | unsigned int i; | |
3014 | ||
3015 | mutex_lock(&gpio_lookup_lock); | |
3016 | ||
3017 | for (i = 0; i < n; i++) | |
3018 | list_add_tail(&tables[i]->list, &gpio_lookup_list); | |
3019 | ||
3020 | mutex_unlock(&gpio_lookup_lock); | |
3021 | } | |
3022 | ||
5f424243 | 3023 | /** |
3fff99bc | 3024 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
3025 | * @array_size: number of elements in the descriptor / value arrays |
3026 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
3027 | * @value_array: array of values to assign | |
3028 | * | |
3029 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3030 | * into account. | |
3031 | * | |
3032 | * This function is to be called from contexts that can sleep. | |
3033 | */ | |
3fff99bc RI |
3034 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
3035 | struct gpio_desc **desc_array, | |
3036 | int *value_array) | |
5f424243 RI |
3037 | { |
3038 | might_sleep_if(extra_checks); | |
3039 | if (!desc_array) | |
3040 | return; | |
44c7288f LW |
3041 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
3042 | value_array); | |
5f424243 | 3043 | } |
3fff99bc | 3044 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 3045 | |
bae48da2 | 3046 | /** |
ad824783 AC |
3047 | * gpiod_add_lookup_table() - register GPIO device consumers |
3048 | * @table: table of consumers to register | |
bae48da2 | 3049 | */ |
ad824783 | 3050 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
3051 | { |
3052 | mutex_lock(&gpio_lookup_lock); | |
3053 | ||
ad824783 | 3054 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
3055 | |
3056 | mutex_unlock(&gpio_lookup_lock); | |
3057 | } | |
226b2242 | 3058 | EXPORT_SYMBOL_GPL(gpiod_add_lookup_table); |
bae48da2 | 3059 | |
be9015ab SK |
3060 | /** |
3061 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
3062 | * @table: table of consumers to unregister | |
3063 | */ | |
3064 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
3065 | { | |
3066 | mutex_lock(&gpio_lookup_lock); | |
3067 | ||
3068 | list_del(&table->list); | |
3069 | ||
3070 | mutex_unlock(&gpio_lookup_lock); | |
3071 | } | |
226b2242 | 3072 | EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table); |
be9015ab | 3073 | |
ad824783 | 3074 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
3075 | { |
3076 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 3077 | struct gpiod_lookup_table *table; |
bae48da2 AC |
3078 | |
3079 | mutex_lock(&gpio_lookup_lock); | |
3080 | ||
ad824783 AC |
3081 | list_for_each_entry(table, &gpio_lookup_list, list) { |
3082 | if (table->dev_id && dev_id) { | |
3083 | /* | |
3084 | * Valid strings on both ends, must be identical to have | |
3085 | * a match | |
3086 | */ | |
3087 | if (!strcmp(table->dev_id, dev_id)) | |
3088 | goto found; | |
3089 | } else { | |
3090 | /* | |
3091 | * One of the pointers is NULL, so both must be to have | |
3092 | * a match | |
3093 | */ | |
3094 | if (dev_id == table->dev_id) | |
3095 | goto found; | |
3096 | } | |
3097 | } | |
3098 | table = NULL; | |
bae48da2 | 3099 | |
ad824783 AC |
3100 | found: |
3101 | mutex_unlock(&gpio_lookup_lock); | |
3102 | return table; | |
3103 | } | |
bae48da2 | 3104 | |
ad824783 AC |
3105 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
3106 | unsigned int idx, | |
3107 | enum gpio_lookup_flags *flags) | |
3108 | { | |
2a3cf6a3 | 3109 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
3110 | struct gpiod_lookup_table *table; |
3111 | struct gpiod_lookup *p; | |
bae48da2 | 3112 | |
ad824783 AC |
3113 | table = gpiod_find_lookup_table(dev); |
3114 | if (!table) | |
3115 | return desc; | |
bae48da2 | 3116 | |
ad824783 AC |
3117 | for (p = &table->table[0]; p->chip_label; p++) { |
3118 | struct gpio_chip *chip; | |
bae48da2 | 3119 | |
ad824783 | 3120 | /* idx must always match exactly */ |
bae48da2 AC |
3121 | if (p->idx != idx) |
3122 | continue; | |
3123 | ||
ad824783 AC |
3124 | /* If the lookup entry has a con_id, require exact match */ |
3125 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
3126 | continue; | |
bae48da2 | 3127 | |
ad824783 | 3128 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 3129 | |
ad824783 | 3130 | if (!chip) { |
2a3cf6a3 AC |
3131 | dev_err(dev, "cannot find GPIO chip %s\n", |
3132 | p->chip_label); | |
3133 | return ERR_PTR(-ENODEV); | |
ad824783 | 3134 | } |
bae48da2 | 3135 | |
ad824783 | 3136 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
3137 | dev_err(dev, |
3138 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
3139 | idx, chip->ngpio, chip->label); | |
3140 | return ERR_PTR(-EINVAL); | |
bae48da2 | 3141 | } |
bae48da2 | 3142 | |
bb1e88cc | 3143 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 3144 | *flags = p->flags; |
bae48da2 | 3145 | |
2a3cf6a3 | 3146 | return desc; |
bae48da2 AC |
3147 | } |
3148 | ||
bae48da2 AC |
3149 | return desc; |
3150 | } | |
3151 | ||
66858527 RI |
3152 | static int dt_gpio_count(struct device *dev, const char *con_id) |
3153 | { | |
3154 | int ret; | |
3155 | char propname[32]; | |
3156 | unsigned int i; | |
3157 | ||
3158 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
3159 | if (con_id) | |
3160 | snprintf(propname, sizeof(propname), "%s-%s", | |
3161 | con_id, gpio_suffixes[i]); | |
3162 | else | |
3163 | snprintf(propname, sizeof(propname), "%s", | |
3164 | gpio_suffixes[i]); | |
3165 | ||
3166 | ret = of_gpio_named_count(dev->of_node, propname); | |
4033d4a4 | 3167 | if (ret > 0) |
66858527 RI |
3168 | break; |
3169 | } | |
4033d4a4 | 3170 | return ret ? ret : -ENOENT; |
66858527 RI |
3171 | } |
3172 | ||
3173 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
3174 | { | |
3175 | struct gpiod_lookup_table *table; | |
3176 | struct gpiod_lookup *p; | |
3177 | unsigned int count = 0; | |
3178 | ||
3179 | table = gpiod_find_lookup_table(dev); | |
3180 | if (!table) | |
3181 | return -ENOENT; | |
3182 | ||
3183 | for (p = &table->table[0]; p->chip_label; p++) { | |
3184 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
3185 | (!con_id && !p->con_id)) | |
3186 | count++; | |
3187 | } | |
3188 | if (!count) | |
3189 | return -ENOENT; | |
3190 | ||
3191 | return count; | |
3192 | } | |
3193 | ||
3194 | /** | |
3195 | * gpiod_count - return the number of GPIOs associated with a device / function | |
3196 | * or -ENOENT if no GPIO has been assigned to the requested function | |
3197 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3198 | * @con_id: function within the GPIO consumer | |
3199 | */ | |
3200 | int gpiod_count(struct device *dev, const char *con_id) | |
3201 | { | |
3202 | int count = -ENOENT; | |
3203 | ||
3204 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
3205 | count = dt_gpio_count(dev, con_id); | |
3206 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
3207 | count = acpi_gpio_count(dev, con_id); | |
3208 | ||
3209 | if (count < 0) | |
3210 | count = platform_gpio_count(dev, con_id); | |
3211 | ||
3212 | return count; | |
3213 | } | |
3214 | EXPORT_SYMBOL_GPL(gpiod_count); | |
3215 | ||
bae48da2 | 3216 | /** |
0879162f | 3217 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 3218 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 3219 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 3220 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3221 | * |
3222 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 3223 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 3224 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 3225 | */ |
b17d1bf1 | 3226 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 3227 | enum gpiod_flags flags) |
bae48da2 | 3228 | { |
39b2bbe3 | 3229 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 3230 | } |
b17d1bf1 | 3231 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 3232 | |
29a1f233 TR |
3233 | /** |
3234 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
3235 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3236 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 3237 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3238 | * |
3239 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
3240 | * the requested function it will return NULL. This is convenient for drivers | |
3241 | * that need to handle optional GPIOs. | |
3242 | */ | |
b17d1bf1 | 3243 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
3244 | const char *con_id, |
3245 | enum gpiod_flags flags) | |
29a1f233 | 3246 | { |
39b2bbe3 | 3247 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 3248 | } |
b17d1bf1 | 3249 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 3250 | |
f625d460 BP |
3251 | |
3252 | /** | |
3253 | * gpiod_configure_flags - helper function to configure a given GPIO | |
3254 | * @desc: gpio whose value will be assigned | |
3255 | * @con_id: function within the GPIO consumer | |
85b03b30 JH |
3256 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
3257 | * of_get_gpio_hog() | |
f625d460 BP |
3258 | * @dflags: gpiod_flags - optional GPIO initialization flags |
3259 | * | |
3260 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
3261 | * requested function and/or index, or another IS_ERR() code if an error | |
3262 | * occurred while trying to acquire the GPIO. | |
3263 | */ | |
c29fd9eb | 3264 | int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, |
85b03b30 | 3265 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
3266 | { |
3267 | int status; | |
3268 | ||
85b03b30 JH |
3269 | if (lflags & GPIO_ACTIVE_LOW) |
3270 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
3271 | if (lflags & GPIO_OPEN_DRAIN) | |
3272 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
3273 | if (lflags & GPIO_OPEN_SOURCE) | |
3274 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
05f479bf CK |
3275 | if (lflags & GPIO_SLEEP_MAY_LOOSE_VALUE) |
3276 | set_bit(FLAG_SLEEP_MAY_LOOSE_VALUE, &desc->flags); | |
85b03b30 | 3277 | |
f625d460 BP |
3278 | /* No particular flag request, return here... */ |
3279 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
3280 | pr_debug("no flags found for %s\n", con_id); | |
3281 | return 0; | |
3282 | } | |
3283 | ||
3284 | /* Process flags */ | |
3285 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
3286 | status = gpiod_direction_output(desc, | |
ad17731d | 3287 | !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL)); |
f625d460 BP |
3288 | else |
3289 | status = gpiod_direction_input(desc); | |
3290 | ||
3291 | return status; | |
3292 | } | |
3293 | ||
bae48da2 AC |
3294 | /** |
3295 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 3296 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
3297 | * @con_id: function within the GPIO consumer |
3298 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3299 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3300 | * |
3301 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
3302 | * defined one for functions that define several GPIOs. | |
3303 | * | |
2a3cf6a3 AC |
3304 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
3305 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 3306 | * occurred while trying to acquire the GPIO. |
bae48da2 | 3307 | */ |
b17d1bf1 | 3308 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 3309 | const char *con_id, |
39b2bbe3 AC |
3310 | unsigned int idx, |
3311 | enum gpiod_flags flags) | |
bae48da2 | 3312 | { |
35c5d7fd | 3313 | struct gpio_desc *desc = NULL; |
bae48da2 | 3314 | int status; |
39b2bbe3 | 3315 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
3316 | |
3317 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
3318 | ||
4d8440b9 RW |
3319 | if (dev) { |
3320 | /* Using device tree? */ | |
3321 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
3322 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
3323 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
3324 | } else if (ACPI_COMPANION(dev)) { | |
3325 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
a31f5c3a | 3326 | desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); |
4d8440b9 | 3327 | } |
35c5d7fd AC |
3328 | } |
3329 | ||
3330 | /* | |
3331 | * Either we are not using DT or ACPI, or their lookup did not return | |
3332 | * a result. In that case, use platform lookup as a fallback. | |
3333 | */ | |
2a3cf6a3 | 3334 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 3335 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 3336 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
3337 | } |
3338 | ||
3339 | if (IS_ERR(desc)) { | |
351cfe0f | 3340 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
3341 | return desc; |
3342 | } | |
3343 | ||
3344 | status = gpiod_request(desc, con_id); | |
bae48da2 AC |
3345 | if (status < 0) |
3346 | return ERR_PTR(status); | |
3347 | ||
85b03b30 | 3348 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
3349 | if (status < 0) { |
3350 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
3351 | gpiod_put(desc); | |
3352 | return ERR_PTR(status); | |
3353 | } | |
3354 | ||
bae48da2 AC |
3355 | return desc; |
3356 | } | |
b17d1bf1 | 3357 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 3358 | |
40b73183 MW |
3359 | /** |
3360 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
3361 | * @fwnode: handle of the firmware node | |
3362 | * @propname: name of the firmware property representing the GPIO | |
537b94da | 3363 | * @index: index of the GPIO to obtain in the consumer |
a264d10f | 3364 | * @dflags: GPIO initialization flags |
950d55f5 | 3365 | * @label: label to attach to the requested GPIO |
40b73183 MW |
3366 | * |
3367 | * This function can be used for drivers that get their configuration | |
3368 | * from firmware. | |
3369 | * | |
3370 | * Function properly finds the corresponding GPIO using whatever is the | |
3371 | * underlying firmware interface and then makes sure that the GPIO | |
3372 | * descriptor is requested before it is returned to the caller. | |
3373 | * | |
950d55f5 | 3374 | * Returns: |
ff21378a | 3375 | * On successful request the GPIO pin is configured in accordance with |
a264d10f AS |
3376 | * provided @dflags. |
3377 | * | |
40b73183 MW |
3378 | * In case of error an ERR_PTR() is returned. |
3379 | */ | |
3380 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
537b94da | 3381 | const char *propname, int index, |
b2987d74 AS |
3382 | enum gpiod_flags dflags, |
3383 | const char *label) | |
40b73183 MW |
3384 | { |
3385 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
a264d10f | 3386 | unsigned long lflags = 0; |
40b73183 | 3387 | bool active_low = false; |
90b665f6 | 3388 | bool single_ended = false; |
4c0facdd | 3389 | bool open_drain = false; |
40b73183 MW |
3390 | int ret; |
3391 | ||
3392 | if (!fwnode) | |
3393 | return ERR_PTR(-EINVAL); | |
3394 | ||
3395 | if (is_of_node(fwnode)) { | |
3396 | enum of_gpio_flags flags; | |
3397 | ||
537b94da BB |
3398 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, |
3399 | index, &flags); | |
90b665f6 | 3400 | if (!IS_ERR(desc)) { |
40b73183 | 3401 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 | 3402 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
4c0facdd | 3403 | open_drain = flags & OF_GPIO_OPEN_DRAIN; |
90b665f6 | 3404 | } |
40b73183 MW |
3405 | } else if (is_acpi_node(fwnode)) { |
3406 | struct acpi_gpio_info info; | |
3407 | ||
537b94da | 3408 | desc = acpi_node_get_gpiod(fwnode, propname, index, &info); |
a31f5c3a | 3409 | if (!IS_ERR(desc)) { |
52044723 | 3410 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
a31f5c3a AS |
3411 | ret = acpi_gpio_update_gpiod_flags(&dflags, info.flags); |
3412 | if (ret) | |
3413 | pr_debug("Override GPIO initialization flags\n"); | |
3414 | } | |
40b73183 MW |
3415 | } |
3416 | ||
3417 | if (IS_ERR(desc)) | |
3418 | return desc; | |
3419 | ||
b2987d74 | 3420 | ret = gpiod_request(desc, label); |
85b03b30 JH |
3421 | if (ret) |
3422 | return ERR_PTR(ret); | |
3423 | ||
40b73183 | 3424 | if (active_low) |
a264d10f | 3425 | lflags |= GPIO_ACTIVE_LOW; |
40b73183 | 3426 | |
90b665f6 | 3427 | if (single_ended) { |
4c0facdd | 3428 | if (open_drain) |
a264d10f | 3429 | lflags |= GPIO_OPEN_DRAIN; |
90b665f6 | 3430 | else |
a264d10f AS |
3431 | lflags |= GPIO_OPEN_SOURCE; |
3432 | } | |
3433 | ||
3434 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); | |
3435 | if (ret < 0) { | |
3436 | gpiod_put(desc); | |
3437 | return ERR_PTR(ret); | |
90b665f6 LP |
3438 | } |
3439 | ||
40b73183 MW |
3440 | return desc; |
3441 | } | |
3442 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
3443 | ||
29a1f233 TR |
3444 | /** |
3445 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
3446 | * function | |
3447 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3448 | * @con_id: function within the GPIO consumer | |
3449 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 3450 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3451 | * |
3452 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
3453 | * specified index was assigned to the requested function it will return NULL. | |
3454 | * This is convenient for drivers that need to handle optional GPIOs. | |
3455 | */ | |
b17d1bf1 | 3456 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 3457 | const char *con_id, |
39b2bbe3 AC |
3458 | unsigned int index, |
3459 | enum gpiod_flags flags) | |
29a1f233 TR |
3460 | { |
3461 | struct gpio_desc *desc; | |
3462 | ||
39b2bbe3 | 3463 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
3464 | if (IS_ERR(desc)) { |
3465 | if (PTR_ERR(desc) == -ENOENT) | |
3466 | return NULL; | |
3467 | } | |
3468 | ||
3469 | return desc; | |
3470 | } | |
b17d1bf1 | 3471 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 3472 | |
f625d460 BP |
3473 | /** |
3474 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
3475 | * @desc: gpio whose value will be assigned | |
3476 | * @name: gpio line name | |
3477 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
3478 | * of_get_gpio_hog() | |
3479 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
3480 | */ | |
3481 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
3482 | unsigned long lflags, enum gpiod_flags dflags) | |
3483 | { | |
3484 | struct gpio_chip *chip; | |
3485 | struct gpio_desc *local_desc; | |
3486 | int hwnum; | |
3487 | int status; | |
3488 | ||
3489 | chip = gpiod_to_chip(desc); | |
3490 | hwnum = gpio_chip_hwgpio(desc); | |
3491 | ||
3492 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); | |
3493 | if (IS_ERR(local_desc)) { | |
c31a571d LD |
3494 | status = PTR_ERR(local_desc); |
3495 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
3496 | name, chip->label, hwnum, status); | |
3497 | return status; | |
f625d460 BP |
3498 | } |
3499 | ||
85b03b30 | 3500 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
f625d460 | 3501 | if (status < 0) { |
c31a571d LD |
3502 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
3503 | name, chip->label, hwnum, status); | |
f625d460 BP |
3504 | gpiochip_free_own_desc(desc); |
3505 | return status; | |
3506 | } | |
3507 | ||
3508 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
3509 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
3510 | ||
3511 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
3512 | desc_to_gpio(desc), name, | |
3513 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
3514 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
3515 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
3516 | ||
3517 | return 0; | |
3518 | } | |
3519 | ||
3520 | /** | |
3521 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
3522 | * @chip: gpio chip to act on | |
3523 | * | |
3524 | * This is only used by of_gpiochip_remove to free hogged gpios | |
3525 | */ | |
3526 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
3527 | { | |
3528 | int id; | |
3529 | ||
3530 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
3531 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
3532 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
3533 | } |
3534 | } | |
3535 | ||
66858527 RI |
3536 | /** |
3537 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
3538 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3539 | * @con_id: function within the GPIO consumer | |
3540 | * @flags: optional GPIO initialization flags | |
3541 | * | |
3542 | * This function acquires all the GPIOs defined under a given function. | |
3543 | * | |
3544 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
3545 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
3546 | * code if an error occurred while trying to acquire the GPIOs. | |
3547 | */ | |
3548 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
3549 | const char *con_id, | |
3550 | enum gpiod_flags flags) | |
3551 | { | |
3552 | struct gpio_desc *desc; | |
3553 | struct gpio_descs *descs; | |
3554 | int count; | |
3555 | ||
3556 | count = gpiod_count(dev, con_id); | |
3557 | if (count < 0) | |
3558 | return ERR_PTR(count); | |
3559 | ||
3560 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
3561 | GFP_KERNEL); | |
3562 | if (!descs) | |
3563 | return ERR_PTR(-ENOMEM); | |
3564 | ||
3565 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
3566 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
3567 | if (IS_ERR(desc)) { | |
3568 | gpiod_put_array(descs); | |
3569 | return ERR_CAST(desc); | |
3570 | } | |
3571 | descs->desc[descs->ndescs] = desc; | |
3572 | descs->ndescs++; | |
3573 | } | |
3574 | return descs; | |
3575 | } | |
3576 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
3577 | ||
3578 | /** | |
3579 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
3580 | * function | |
3581 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3582 | * @con_id: function within the GPIO consumer | |
3583 | * @flags: optional GPIO initialization flags | |
3584 | * | |
3585 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
3586 | * assigned to the requested function it will return NULL. | |
3587 | */ | |
3588 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
3589 | const char *con_id, | |
3590 | enum gpiod_flags flags) | |
3591 | { | |
3592 | struct gpio_descs *descs; | |
3593 | ||
3594 | descs = gpiod_get_array(dev, con_id, flags); | |
3595 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
3596 | return NULL; | |
3597 | ||
3598 | return descs; | |
3599 | } | |
3600 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
3601 | ||
bae48da2 AC |
3602 | /** |
3603 | * gpiod_put - dispose of a GPIO descriptor | |
3604 | * @desc: GPIO descriptor to dispose of | |
3605 | * | |
3606 | * No descriptor can be used after gpiod_put() has been called on it. | |
3607 | */ | |
3608 | void gpiod_put(struct gpio_desc *desc) | |
3609 | { | |
3610 | gpiod_free(desc); | |
372e722e | 3611 | } |
bae48da2 | 3612 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 3613 | |
66858527 RI |
3614 | /** |
3615 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
3616 | * @descs: struct gpio_descs containing an array of descriptors | |
3617 | */ | |
3618 | void gpiod_put_array(struct gpio_descs *descs) | |
3619 | { | |
3620 | unsigned int i; | |
3621 | ||
3622 | for (i = 0; i < descs->ndescs; i++) | |
3623 | gpiod_put(descs->desc[i]); | |
3624 | ||
3625 | kfree(descs); | |
3626 | } | |
3627 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
3628 | ||
3c702e99 LW |
3629 | static int __init gpiolib_dev_init(void) |
3630 | { | |
3631 | int ret; | |
3632 | ||
3633 | /* Register GPIO sysfs bus */ | |
3634 | ret = bus_register(&gpio_bus_type); | |
3635 | if (ret < 0) { | |
3636 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
3637 | return ret; | |
3638 | } | |
3639 | ||
3640 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
3641 | if (ret < 0) { | |
3642 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
3643 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
3644 | } else { |
3645 | gpiolib_initialized = true; | |
3646 | gpiochip_setup_devs(); | |
3c702e99 LW |
3647 | } |
3648 | return ret; | |
3649 | } | |
3650 | core_initcall(gpiolib_dev_init); | |
3651 | ||
d2876d08 DB |
3652 | #ifdef CONFIG_DEBUG_FS |
3653 | ||
fdeb8e15 | 3654 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
3655 | { |
3656 | unsigned i; | |
fdeb8e15 LW |
3657 | struct gpio_chip *chip = gdev->chip; |
3658 | unsigned gpio = gdev->base; | |
3659 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 3660 | int is_out; |
d468bf9e | 3661 | int is_irq; |
d2876d08 | 3662 | |
fdeb8e15 | 3663 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
3664 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
3665 | if (gdesc->name) { | |
3666 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
3667 | gpio, gdesc->name); | |
3668 | } | |
d2876d08 | 3669 | continue; |
ced433e2 | 3670 | } |
d2876d08 | 3671 | |
372e722e | 3672 | gpiod_get_direction(gdesc); |
d2876d08 | 3673 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 3674 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
3675 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
3676 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
3677 | is_out ? "out" : "in ", |
3678 | chip->get | |
3679 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
3680 | : "? ", |
3681 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
3682 | seq_printf(s, "\n"); |
3683 | } | |
3684 | } | |
3685 | ||
f9c4a31f | 3686 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 3687 | { |
362432ae | 3688 | unsigned long flags; |
ff2b1359 | 3689 | struct gpio_device *gdev = NULL; |
cb1650d4 | 3690 | loff_t index = *pos; |
d2876d08 | 3691 | |
f9c4a31f | 3692 | s->private = ""; |
d2876d08 | 3693 | |
362432ae | 3694 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3695 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
3696 | if (index-- == 0) { |
3697 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 3698 | return gdev; |
f9c4a31f | 3699 | } |
362432ae | 3700 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 3701 | |
cb1650d4 | 3702 | return NULL; |
f9c4a31f TR |
3703 | } |
3704 | ||
3705 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
3706 | { | |
362432ae | 3707 | unsigned long flags; |
ff2b1359 | 3708 | struct gpio_device *gdev = v; |
f9c4a31f TR |
3709 | void *ret = NULL; |
3710 | ||
362432ae | 3711 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 3712 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
3713 | ret = NULL; |
3714 | else | |
ff2b1359 | 3715 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 3716 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
3717 | |
3718 | s->private = "\n"; | |
3719 | ++*pos; | |
3720 | ||
3721 | return ret; | |
3722 | } | |
3723 | ||
3724 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
3725 | { | |
3726 | } | |
3727 | ||
3728 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
3729 | { | |
ff2b1359 LW |
3730 | struct gpio_device *gdev = v; |
3731 | struct gpio_chip *chip = gdev->chip; | |
3732 | struct device *parent; | |
3733 | ||
3734 | if (!chip) { | |
3735 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
3736 | dev_name(&gdev->dev)); | |
3737 | return 0; | |
3738 | } | |
f9c4a31f | 3739 | |
ff2b1359 LW |
3740 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
3741 | dev_name(&gdev->dev), | |
fdeb8e15 | 3742 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
3743 | parent = chip->parent; |
3744 | if (parent) | |
3745 | seq_printf(s, ", parent: %s/%s", | |
3746 | parent->bus ? parent->bus->name : "no-bus", | |
3747 | dev_name(parent)); | |
f9c4a31f TR |
3748 | if (chip->label) |
3749 | seq_printf(s, ", %s", chip->label); | |
3750 | if (chip->can_sleep) | |
3751 | seq_printf(s, ", can sleep"); | |
3752 | seq_printf(s, ":\n"); | |
3753 | ||
3754 | if (chip->dbg_show) | |
3755 | chip->dbg_show(s, chip); | |
3756 | else | |
fdeb8e15 | 3757 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 3758 | |
d2876d08 DB |
3759 | return 0; |
3760 | } | |
3761 | ||
f9c4a31f TR |
3762 | static const struct seq_operations gpiolib_seq_ops = { |
3763 | .start = gpiolib_seq_start, | |
3764 | .next = gpiolib_seq_next, | |
3765 | .stop = gpiolib_seq_stop, | |
3766 | .show = gpiolib_seq_show, | |
3767 | }; | |
3768 | ||
d2876d08 DB |
3769 | static int gpiolib_open(struct inode *inode, struct file *file) |
3770 | { | |
f9c4a31f | 3771 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
3772 | } |
3773 | ||
828c0950 | 3774 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 3775 | .owner = THIS_MODULE, |
d2876d08 DB |
3776 | .open = gpiolib_open, |
3777 | .read = seq_read, | |
3778 | .llseek = seq_lseek, | |
f9c4a31f | 3779 | .release = seq_release, |
d2876d08 DB |
3780 | }; |
3781 | ||
3782 | static int __init gpiolib_debugfs_init(void) | |
3783 | { | |
3784 | /* /sys/kernel/debug/gpio */ | |
3785 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
3786 | NULL, NULL, &gpiolib_operations); | |
3787 | return 0; | |
3788 | } | |
3789 | subsys_initcall(gpiolib_debugfs_init); | |
3790 | ||
3791 | #endif /* DEBUG_FS */ |