]>
Commit | Line | Data |
---|---|---|
2744e8af LW |
1 | /* |
2 | * Core driver for the pin control subsystem | |
3 | * | |
4 | * Copyright (C) 2011 ST-Ericsson SA | |
5 | * Written on behalf of Linaro for ST-Ericsson | |
6 | * Based on bits of regulator core, gpio core and clk core | |
7 | * | |
8 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
9 | * | |
10 | * License terms: GNU General Public License (GPL) version 2 | |
11 | */ | |
12 | #define pr_fmt(fmt) "pinctrl core: " fmt | |
13 | ||
14 | #include <linux/kernel.h> | |
a5a697cd | 15 | #include <linux/export.h> |
2744e8af LW |
16 | #include <linux/init.h> |
17 | #include <linux/device.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/radix-tree.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/sysfs.h> | |
25 | #include <linux/debugfs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/pinctrl/pinctrl.h> | |
28 | #include <linux/pinctrl/machine.h> | |
29 | #include "core.h" | |
30 | #include "pinmux.h" | |
ae6b4d85 | 31 | #include "pinconf.h" |
2744e8af LW |
32 | |
33 | /* Global list of pin control devices */ | |
34 | static DEFINE_MUTEX(pinctrldev_list_mutex); | |
35 | static LIST_HEAD(pinctrldev_list); | |
36 | ||
2744e8af LW |
37 | const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) |
38 | { | |
39 | /* We're not allowed to register devices without name */ | |
40 | return pctldev->desc->name; | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); | |
43 | ||
44 | void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) | |
45 | { | |
46 | return pctldev->driver_data; | |
47 | } | |
48 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); | |
49 | ||
50 | /** | |
51 | * get_pinctrl_dev_from_dev() - look up pin controller device | |
52 | * @dev: a device pointer, this may be NULL but then devname needs to be | |
53 | * defined instead | |
54 | * @devname: the name of a device instance, as returned by dev_name(), this | |
55 | * may be NULL but then dev needs to be defined instead | |
56 | * | |
57 | * Looks up a pin control device matching a certain device name or pure device | |
58 | * pointer, the pure device pointer will take precedence. | |
59 | */ | |
60 | struct pinctrl_dev *get_pinctrl_dev_from_dev(struct device *dev, | |
61 | const char *devname) | |
62 | { | |
63 | struct pinctrl_dev *pctldev = NULL; | |
64 | bool found = false; | |
65 | ||
66 | mutex_lock(&pinctrldev_list_mutex); | |
67 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
51cd24ee | 68 | if (dev && pctldev->dev == dev) { |
2744e8af LW |
69 | /* Matched on device pointer */ |
70 | found = true; | |
71 | break; | |
72 | } | |
73 | ||
74 | if (devname && | |
51cd24ee | 75 | !strcmp(dev_name(pctldev->dev), devname)) { |
2744e8af LW |
76 | /* Matched on device name */ |
77 | found = true; | |
78 | break; | |
79 | } | |
80 | } | |
81 | mutex_unlock(&pinctrldev_list_mutex); | |
82 | ||
83 | return found ? pctldev : NULL; | |
84 | } | |
85 | ||
33d58949 | 86 | struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, unsigned int pin) |
2744e8af LW |
87 | { |
88 | struct pin_desc *pindesc; | |
89 | unsigned long flags; | |
90 | ||
91 | spin_lock_irqsave(&pctldev->pin_desc_tree_lock, flags); | |
92 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, pin); | |
93 | spin_unlock_irqrestore(&pctldev->pin_desc_tree_lock, flags); | |
94 | ||
95 | return pindesc; | |
96 | } | |
97 | ||
ae6b4d85 LW |
98 | /** |
99 | * pin_get_from_name() - look up a pin number from a name | |
100 | * @pctldev: the pin control device to lookup the pin on | |
101 | * @name: the name of the pin to look up | |
102 | */ | |
103 | int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) | |
104 | { | |
706e8520 | 105 | unsigned i, pin; |
ae6b4d85 | 106 | |
706e8520 CP |
107 | /* The pin number can be retrived from the pin controller descriptor */ |
108 | for (i = 0; i < pctldev->desc->npins; i++) { | |
ae6b4d85 LW |
109 | struct pin_desc *desc; |
110 | ||
706e8520 | 111 | pin = pctldev->desc->pins[i].number; |
ae6b4d85 LW |
112 | desc = pin_desc_get(pctldev, pin); |
113 | /* Pin space may be sparse */ | |
114 | if (desc == NULL) | |
115 | continue; | |
116 | if (desc->name && !strcmp(name, desc->name)) | |
117 | return pin; | |
118 | } | |
119 | ||
120 | return -EINVAL; | |
121 | } | |
122 | ||
2744e8af LW |
123 | /** |
124 | * pin_is_valid() - check if pin exists on controller | |
125 | * @pctldev: the pin control device to check the pin on | |
126 | * @pin: pin to check, use the local pin controller index number | |
127 | * | |
128 | * This tells us whether a certain pin exist on a certain pin controller or | |
129 | * not. Pin lists may be sparse, so some pins may not exist. | |
130 | */ | |
131 | bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) | |
132 | { | |
133 | struct pin_desc *pindesc; | |
134 | ||
135 | if (pin < 0) | |
136 | return false; | |
137 | ||
138 | pindesc = pin_desc_get(pctldev, pin); | |
139 | if (pindesc == NULL) | |
140 | return false; | |
141 | ||
142 | return true; | |
143 | } | |
144 | EXPORT_SYMBOL_GPL(pin_is_valid); | |
145 | ||
146 | /* Deletes a range of pin descriptors */ | |
147 | static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, | |
148 | const struct pinctrl_pin_desc *pins, | |
149 | unsigned num_pins) | |
150 | { | |
151 | int i; | |
152 | ||
153 | spin_lock(&pctldev->pin_desc_tree_lock); | |
154 | for (i = 0; i < num_pins; i++) { | |
155 | struct pin_desc *pindesc; | |
156 | ||
157 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, | |
158 | pins[i].number); | |
159 | if (pindesc != NULL) { | |
160 | radix_tree_delete(&pctldev->pin_desc_tree, | |
161 | pins[i].number); | |
ca53c5f1 LW |
162 | if (pindesc->dynamic_name) |
163 | kfree(pindesc->name); | |
2744e8af LW |
164 | } |
165 | kfree(pindesc); | |
166 | } | |
167 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
168 | } | |
169 | ||
170 | static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, | |
171 | unsigned number, const char *name) | |
172 | { | |
173 | struct pin_desc *pindesc; | |
174 | ||
175 | pindesc = pin_desc_get(pctldev, number); | |
176 | if (pindesc != NULL) { | |
177 | pr_err("pin %d already registered on %s\n", number, | |
178 | pctldev->desc->name); | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); | |
183 | if (pindesc == NULL) | |
184 | return -ENOMEM; | |
ae6b4d85 | 185 | |
2744e8af LW |
186 | spin_lock_init(&pindesc->lock); |
187 | ||
188 | /* Set owner */ | |
189 | pindesc->pctldev = pctldev; | |
190 | ||
9af1e44f | 191 | /* Copy basic pin info */ |
ca53c5f1 LW |
192 | if (pindesc->name) { |
193 | pindesc->name = name; | |
194 | } else { | |
195 | pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number); | |
196 | if (pindesc->name == NULL) | |
197 | return -ENOMEM; | |
198 | pindesc->dynamic_name = true; | |
199 | } | |
2744e8af LW |
200 | |
201 | spin_lock(&pctldev->pin_desc_tree_lock); | |
202 | radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); | |
203 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
204 | pr_debug("registered pin %d (%s) on %s\n", | |
ca53c5f1 | 205 | number, pindesc->name, pctldev->desc->name); |
2744e8af LW |
206 | return 0; |
207 | } | |
208 | ||
209 | static int pinctrl_register_pins(struct pinctrl_dev *pctldev, | |
210 | struct pinctrl_pin_desc const *pins, | |
211 | unsigned num_descs) | |
212 | { | |
213 | unsigned i; | |
214 | int ret = 0; | |
215 | ||
216 | for (i = 0; i < num_descs; i++) { | |
217 | ret = pinctrl_register_one_pin(pctldev, | |
218 | pins[i].number, pins[i].name); | |
219 | if (ret) | |
220 | return ret; | |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | /** | |
227 | * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range | |
228 | * @pctldev: pin controller device to check | |
229 | * @gpio: gpio pin to check taken from the global GPIO pin space | |
230 | * | |
231 | * Tries to match a GPIO pin number to the ranges handled by a certain pin | |
232 | * controller, return the range or NULL | |
233 | */ | |
234 | static struct pinctrl_gpio_range * | |
235 | pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) | |
236 | { | |
237 | struct pinctrl_gpio_range *range = NULL; | |
238 | ||
239 | /* Loop over the ranges */ | |
240 | mutex_lock(&pctldev->gpio_ranges_lock); | |
241 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
242 | /* Check if we're in the valid range */ | |
243 | if (gpio >= range->base && | |
244 | gpio < range->base + range->npins) { | |
245 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
246 | return range; | |
247 | } | |
248 | } | |
249 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
250 | ||
251 | return NULL; | |
252 | } | |
253 | ||
254 | /** | |
255 | * pinctrl_get_device_gpio_range() - find device for GPIO range | |
256 | * @gpio: the pin to locate the pin controller for | |
257 | * @outdev: the pin control device if found | |
258 | * @outrange: the GPIO range if found | |
259 | * | |
260 | * Find the pin controller handling a certain GPIO pin from the pinspace of | |
261 | * the GPIO subsystem, return the device and the matching GPIO range. Returns | |
262 | * negative if the GPIO range could not be found in any device. | |
263 | */ | |
264 | int pinctrl_get_device_gpio_range(unsigned gpio, | |
265 | struct pinctrl_dev **outdev, | |
266 | struct pinctrl_gpio_range **outrange) | |
267 | { | |
268 | struct pinctrl_dev *pctldev = NULL; | |
269 | ||
270 | /* Loop over the pin controllers */ | |
271 | mutex_lock(&pinctrldev_list_mutex); | |
272 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
273 | struct pinctrl_gpio_range *range; | |
274 | ||
275 | range = pinctrl_match_gpio_range(pctldev, gpio); | |
276 | if (range != NULL) { | |
277 | *outdev = pctldev; | |
278 | *outrange = range; | |
279 | mutex_unlock(&pinctrldev_list_mutex); | |
280 | return 0; | |
281 | } | |
282 | } | |
283 | mutex_unlock(&pinctrldev_list_mutex); | |
284 | ||
285 | return -EINVAL; | |
286 | } | |
287 | ||
288 | /** | |
289 | * pinctrl_add_gpio_range() - register a GPIO range for a controller | |
290 | * @pctldev: pin controller device to add the range to | |
291 | * @range: the GPIO range to add | |
292 | * | |
293 | * This adds a range of GPIOs to be handled by a certain pin controller. Call | |
294 | * this to register handled ranges after registering your pin controller. | |
295 | */ | |
296 | void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, | |
297 | struct pinctrl_gpio_range *range) | |
298 | { | |
299 | mutex_lock(&pctldev->gpio_ranges_lock); | |
300 | list_add(&range->node, &pctldev->gpio_ranges); | |
301 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
302 | } | |
303 | ||
304 | /** | |
305 | * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller | |
306 | * @pctldev: pin controller device to remove the range from | |
307 | * @range: the GPIO range to remove | |
308 | */ | |
309 | void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, | |
310 | struct pinctrl_gpio_range *range) | |
311 | { | |
312 | mutex_lock(&pctldev->gpio_ranges_lock); | |
313 | list_del(&range->node); | |
314 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
315 | } | |
316 | ||
7afde8ba LW |
317 | /** |
318 | * pinctrl_get_group_selector() - returns the group selector for a group | |
319 | * @pctldev: the pin controller handling the group | |
320 | * @pin_group: the pin group to look up | |
321 | */ | |
322 | int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, | |
323 | const char *pin_group) | |
324 | { | |
325 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
326 | unsigned group_selector = 0; | |
327 | ||
328 | while (pctlops->list_groups(pctldev, group_selector) >= 0) { | |
329 | const char *gname = pctlops->get_group_name(pctldev, | |
330 | group_selector); | |
331 | if (!strcmp(gname, pin_group)) { | |
51cd24ee | 332 | dev_dbg(pctldev->dev, |
7afde8ba LW |
333 | "found group selector %u for %s\n", |
334 | group_selector, | |
335 | pin_group); | |
336 | return group_selector; | |
337 | } | |
338 | ||
339 | group_selector++; | |
340 | } | |
341 | ||
51cd24ee | 342 | dev_err(pctldev->dev, "does not have pin group %s\n", |
7afde8ba LW |
343 | pin_group); |
344 | ||
345 | return -EINVAL; | |
346 | } | |
347 | ||
2744e8af LW |
348 | #ifdef CONFIG_DEBUG_FS |
349 | ||
350 | static int pinctrl_pins_show(struct seq_file *s, void *what) | |
351 | { | |
352 | struct pinctrl_dev *pctldev = s->private; | |
353 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
706e8520 | 354 | unsigned i, pin; |
2744e8af LW |
355 | |
356 | seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); | |
2744e8af | 357 | |
706e8520 CP |
358 | /* The pin number can be retrived from the pin controller descriptor */ |
359 | for (i = 0; i < pctldev->desc->npins; i++) { | |
2744e8af LW |
360 | struct pin_desc *desc; |
361 | ||
706e8520 | 362 | pin = pctldev->desc->pins[i].number; |
2744e8af LW |
363 | desc = pin_desc_get(pctldev, pin); |
364 | /* Pin space may be sparse */ | |
365 | if (desc == NULL) | |
366 | continue; | |
367 | ||
368 | seq_printf(s, "pin %d (%s) ", pin, | |
369 | desc->name ? desc->name : "unnamed"); | |
370 | ||
371 | /* Driver-specific info per pin */ | |
372 | if (ops->pin_dbg_show) | |
373 | ops->pin_dbg_show(pctldev, s, pin); | |
374 | ||
375 | seq_puts(s, "\n"); | |
376 | } | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static int pinctrl_groups_show(struct seq_file *s, void *what) | |
382 | { | |
383 | struct pinctrl_dev *pctldev = s->private; | |
384 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
385 | unsigned selector = 0; | |
386 | ||
387 | /* No grouping */ | |
388 | if (!ops) | |
389 | return 0; | |
390 | ||
391 | seq_puts(s, "registered pin groups:\n"); | |
392 | while (ops->list_groups(pctldev, selector) >= 0) { | |
a5818a8b | 393 | const unsigned *pins; |
2744e8af LW |
394 | unsigned num_pins; |
395 | const char *gname = ops->get_group_name(pctldev, selector); | |
396 | int ret; | |
397 | int i; | |
398 | ||
399 | ret = ops->get_group_pins(pctldev, selector, | |
400 | &pins, &num_pins); | |
401 | if (ret) | |
402 | seq_printf(s, "%s [ERROR GETTING PINS]\n", | |
403 | gname); | |
404 | else { | |
405 | seq_printf(s, "group: %s, pins = [ ", gname); | |
406 | for (i = 0; i < num_pins; i++) | |
407 | seq_printf(s, "%d ", pins[i]); | |
408 | seq_puts(s, "]\n"); | |
409 | } | |
410 | selector++; | |
411 | } | |
412 | ||
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static int pinctrl_gpioranges_show(struct seq_file *s, void *what) | |
418 | { | |
419 | struct pinctrl_dev *pctldev = s->private; | |
420 | struct pinctrl_gpio_range *range = NULL; | |
421 | ||
422 | seq_puts(s, "GPIO ranges handled:\n"); | |
423 | ||
424 | /* Loop over the ranges */ | |
425 | mutex_lock(&pctldev->gpio_ranges_lock); | |
426 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
75d6642a LW |
427 | seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
428 | range->id, range->name, | |
429 | range->base, (range->base + range->npins - 1), | |
430 | range->pin_base, | |
431 | (range->pin_base + range->npins - 1)); | |
2744e8af LW |
432 | } |
433 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static int pinctrl_devices_show(struct seq_file *s, void *what) | |
439 | { | |
440 | struct pinctrl_dev *pctldev; | |
441 | ||
ae6b4d85 | 442 | seq_puts(s, "name [pinmux] [pinconf]\n"); |
2744e8af LW |
443 | mutex_lock(&pinctrldev_list_mutex); |
444 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
445 | seq_printf(s, "%s ", pctldev->desc->name); | |
446 | if (pctldev->desc->pmxops) | |
ae6b4d85 LW |
447 | seq_puts(s, "yes "); |
448 | else | |
449 | seq_puts(s, "no "); | |
450 | if (pctldev->desc->confops) | |
2744e8af LW |
451 | seq_puts(s, "yes"); |
452 | else | |
453 | seq_puts(s, "no"); | |
454 | seq_puts(s, "\n"); | |
455 | } | |
456 | mutex_unlock(&pinctrldev_list_mutex); | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | static int pinctrl_pins_open(struct inode *inode, struct file *file) | |
462 | { | |
463 | return single_open(file, pinctrl_pins_show, inode->i_private); | |
464 | } | |
465 | ||
466 | static int pinctrl_groups_open(struct inode *inode, struct file *file) | |
467 | { | |
468 | return single_open(file, pinctrl_groups_show, inode->i_private); | |
469 | } | |
470 | ||
471 | static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) | |
472 | { | |
473 | return single_open(file, pinctrl_gpioranges_show, inode->i_private); | |
474 | } | |
475 | ||
476 | static int pinctrl_devices_open(struct inode *inode, struct file *file) | |
477 | { | |
478 | return single_open(file, pinctrl_devices_show, NULL); | |
479 | } | |
480 | ||
481 | static const struct file_operations pinctrl_pins_ops = { | |
482 | .open = pinctrl_pins_open, | |
483 | .read = seq_read, | |
484 | .llseek = seq_lseek, | |
485 | .release = single_release, | |
486 | }; | |
487 | ||
488 | static const struct file_operations pinctrl_groups_ops = { | |
489 | .open = pinctrl_groups_open, | |
490 | .read = seq_read, | |
491 | .llseek = seq_lseek, | |
492 | .release = single_release, | |
493 | }; | |
494 | ||
495 | static const struct file_operations pinctrl_gpioranges_ops = { | |
496 | .open = pinctrl_gpioranges_open, | |
497 | .read = seq_read, | |
498 | .llseek = seq_lseek, | |
499 | .release = single_release, | |
500 | }; | |
501 | ||
502 | static const struct file_operations pinctrl_devices_ops = { | |
503 | .open = pinctrl_devices_open, | |
504 | .read = seq_read, | |
505 | .llseek = seq_lseek, | |
506 | .release = single_release, | |
507 | }; | |
508 | ||
509 | static struct dentry *debugfs_root; | |
510 | ||
511 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
512 | { | |
513 | static struct dentry *device_root; | |
514 | ||
51cd24ee | 515 | device_root = debugfs_create_dir(dev_name(pctldev->dev), |
2744e8af LW |
516 | debugfs_root); |
517 | if (IS_ERR(device_root) || !device_root) { | |
518 | pr_warn("failed to create debugfs directory for %s\n", | |
51cd24ee | 519 | dev_name(pctldev->dev)); |
2744e8af LW |
520 | return; |
521 | } | |
522 | debugfs_create_file("pins", S_IFREG | S_IRUGO, | |
523 | device_root, pctldev, &pinctrl_pins_ops); | |
524 | debugfs_create_file("pingroups", S_IFREG | S_IRUGO, | |
525 | device_root, pctldev, &pinctrl_groups_ops); | |
526 | debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, | |
527 | device_root, pctldev, &pinctrl_gpioranges_ops); | |
528 | pinmux_init_device_debugfs(device_root, pctldev); | |
ae6b4d85 | 529 | pinconf_init_device_debugfs(device_root, pctldev); |
2744e8af LW |
530 | } |
531 | ||
532 | static void pinctrl_init_debugfs(void) | |
533 | { | |
534 | debugfs_root = debugfs_create_dir("pinctrl", NULL); | |
535 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
536 | pr_warn("failed to create debugfs directory\n"); | |
537 | debugfs_root = NULL; | |
538 | return; | |
539 | } | |
540 | ||
541 | debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, | |
542 | debugfs_root, NULL, &pinctrl_devices_ops); | |
543 | pinmux_init_debugfs(debugfs_root); | |
544 | } | |
545 | ||
546 | #else /* CONFIG_DEBUG_FS */ | |
547 | ||
548 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
549 | { | |
550 | } | |
551 | ||
552 | static void pinctrl_init_debugfs(void) | |
553 | { | |
554 | } | |
555 | ||
556 | #endif | |
557 | ||
558 | /** | |
559 | * pinctrl_register() - register a pin controller device | |
560 | * @pctldesc: descriptor for this pin controller | |
561 | * @dev: parent device for this pin controller | |
562 | * @driver_data: private pin controller data for this pin controller | |
563 | */ | |
564 | struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, | |
565 | struct device *dev, void *driver_data) | |
566 | { | |
2744e8af LW |
567 | struct pinctrl_dev *pctldev; |
568 | int ret; | |
569 | ||
570 | if (pctldesc == NULL) | |
571 | return NULL; | |
572 | if (pctldesc->name == NULL) | |
573 | return NULL; | |
574 | ||
575 | /* If we're implementing pinmuxing, check the ops for sanity */ | |
576 | if (pctldesc->pmxops) { | |
577 | ret = pinmux_check_ops(pctldesc->pmxops); | |
578 | if (ret) { | |
579 | pr_err("%s pinmux ops lacks necessary functions\n", | |
580 | pctldesc->name); | |
581 | return NULL; | |
582 | } | |
583 | } | |
584 | ||
ae6b4d85 LW |
585 | /* If we're implementing pinconfig, check the ops for sanity */ |
586 | if (pctldesc->confops) { | |
587 | ret = pinconf_check_ops(pctldesc->confops); | |
588 | if (ret) { | |
589 | pr_err("%s pin config ops lacks necessary functions\n", | |
590 | pctldesc->name); | |
591 | return NULL; | |
592 | } | |
593 | } | |
594 | ||
2744e8af LW |
595 | pctldev = kzalloc(sizeof(struct pinctrl_dev), GFP_KERNEL); |
596 | if (pctldev == NULL) | |
597 | return NULL; | |
598 | ||
599 | /* Initialize pin control device struct */ | |
600 | pctldev->owner = pctldesc->owner; | |
601 | pctldev->desc = pctldesc; | |
602 | pctldev->driver_data = driver_data; | |
603 | INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); | |
604 | spin_lock_init(&pctldev->pin_desc_tree_lock); | |
605 | INIT_LIST_HEAD(&pctldev->gpio_ranges); | |
606 | mutex_init(&pctldev->gpio_ranges_lock); | |
51cd24ee | 607 | pctldev->dev = dev; |
2744e8af LW |
608 | |
609 | /* Register all the pins */ | |
610 | pr_debug("try to register %d pins on %s...\n", | |
611 | pctldesc->npins, pctldesc->name); | |
612 | ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); | |
613 | if (ret) { | |
614 | pr_err("error during pin registration\n"); | |
615 | pinctrl_free_pindescs(pctldev, pctldesc->pins, | |
616 | pctldesc->npins); | |
51cd24ee | 617 | goto out_err; |
2744e8af LW |
618 | } |
619 | ||
620 | pinctrl_init_device_debugfs(pctldev); | |
621 | mutex_lock(&pinctrldev_list_mutex); | |
622 | list_add(&pctldev->node, &pinctrldev_list); | |
623 | mutex_unlock(&pinctrldev_list_mutex); | |
624 | pinmux_hog_maps(pctldev); | |
625 | return pctldev; | |
626 | ||
51cd24ee SW |
627 | out_err: |
628 | kfree(pctldev); | |
2744e8af LW |
629 | return NULL; |
630 | } | |
631 | EXPORT_SYMBOL_GPL(pinctrl_register); | |
632 | ||
633 | /** | |
634 | * pinctrl_unregister() - unregister pinmux | |
635 | * @pctldev: pin controller to unregister | |
636 | * | |
637 | * Called by pinmux drivers to unregister a pinmux. | |
638 | */ | |
639 | void pinctrl_unregister(struct pinctrl_dev *pctldev) | |
640 | { | |
641 | if (pctldev == NULL) | |
642 | return; | |
643 | ||
644 | pinmux_unhog_maps(pctldev); | |
645 | /* TODO: check that no pinmuxes are still active? */ | |
646 | mutex_lock(&pinctrldev_list_mutex); | |
647 | list_del(&pctldev->node); | |
648 | mutex_unlock(&pinctrldev_list_mutex); | |
649 | /* Destroy descriptor tree */ | |
650 | pinctrl_free_pindescs(pctldev, pctldev->desc->pins, | |
651 | pctldev->desc->npins); | |
51cd24ee | 652 | kfree(pctldev); |
2744e8af LW |
653 | } |
654 | EXPORT_SYMBOL_GPL(pinctrl_unregister); | |
655 | ||
656 | static int __init pinctrl_init(void) | |
657 | { | |
658 | pr_info("initialized pinctrl subsystem\n"); | |
659 | pinctrl_init_debugfs(); | |
660 | return 0; | |
661 | } | |
662 | ||
663 | /* init early since many drivers really need to initialized pinmux early */ | |
664 | core_initcall(pinctrl_init); |