Commit | Line | Data |
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2744e8af LW |
1 | /* |
2 | * Core driver for the pin control subsystem | |
3 | * | |
befe5bdf | 4 | * Copyright (C) 2011-2012 ST-Ericsson SA |
2744e8af LW |
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 | 32 | |
befe5bdf LW |
33 | /** |
34 | * struct pinctrl_hog - a list item to stash control hogs | |
35 | * @node: pin control hog list node | |
36 | * @map: map entry responsible for this hogging | |
37 | * @pmx: the pin control hogged by this item | |
38 | */ | |
39 | struct pinctrl_hog { | |
40 | struct list_head node; | |
41 | struct pinctrl_map const *map; | |
42 | struct pinctrl *p; | |
43 | }; | |
44 | ||
2744e8af LW |
45 | /* Global list of pin control devices */ |
46 | static DEFINE_MUTEX(pinctrldev_list_mutex); | |
47 | static LIST_HEAD(pinctrldev_list); | |
48 | ||
befe5bdf LW |
49 | /* List of pin controller handles */ |
50 | static DEFINE_MUTEX(pinctrl_list_mutex); | |
51 | static LIST_HEAD(pinctrl_list); | |
52 | ||
53 | /* Global pinctrl maps */ | |
54 | static struct pinctrl_map *pinctrl_maps; | |
55 | static unsigned pinctrl_maps_num; | |
56 | ||
2744e8af LW |
57 | const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) |
58 | { | |
59 | /* We're not allowed to register devices without name */ | |
60 | return pctldev->desc->name; | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); | |
63 | ||
64 | void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) | |
65 | { | |
66 | return pctldev->driver_data; | |
67 | } | |
68 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); | |
69 | ||
70 | /** | |
9dfac4fd LW |
71 | * get_pinctrl_dev_from_devname() - look up pin controller device |
72 | * @devname: the name of a device instance, as returned by dev_name() | |
2744e8af LW |
73 | * |
74 | * Looks up a pin control device matching a certain device name or pure device | |
75 | * pointer, the pure device pointer will take precedence. | |
76 | */ | |
9dfac4fd | 77 | struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname) |
2744e8af LW |
78 | { |
79 | struct pinctrl_dev *pctldev = NULL; | |
80 | bool found = false; | |
81 | ||
9dfac4fd LW |
82 | if (!devname) |
83 | return NULL; | |
84 | ||
2744e8af LW |
85 | mutex_lock(&pinctrldev_list_mutex); |
86 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
9dfac4fd | 87 | if (!strcmp(dev_name(pctldev->dev), devname)) { |
2744e8af LW |
88 | /* Matched on device name */ |
89 | found = true; | |
90 | break; | |
91 | } | |
92 | } | |
93 | mutex_unlock(&pinctrldev_list_mutex); | |
94 | ||
95 | return found ? pctldev : NULL; | |
96 | } | |
97 | ||
33d58949 | 98 | struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, unsigned int pin) |
2744e8af LW |
99 | { |
100 | struct pin_desc *pindesc; | |
101 | unsigned long flags; | |
102 | ||
103 | spin_lock_irqsave(&pctldev->pin_desc_tree_lock, flags); | |
104 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, pin); | |
105 | spin_unlock_irqrestore(&pctldev->pin_desc_tree_lock, flags); | |
106 | ||
107 | return pindesc; | |
108 | } | |
109 | ||
ae6b4d85 LW |
110 | /** |
111 | * pin_get_from_name() - look up a pin number from a name | |
112 | * @pctldev: the pin control device to lookup the pin on | |
113 | * @name: the name of the pin to look up | |
114 | */ | |
115 | int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) | |
116 | { | |
706e8520 | 117 | unsigned i, pin; |
ae6b4d85 | 118 | |
706e8520 CP |
119 | /* The pin number can be retrived from the pin controller descriptor */ |
120 | for (i = 0; i < pctldev->desc->npins; i++) { | |
ae6b4d85 LW |
121 | struct pin_desc *desc; |
122 | ||
706e8520 | 123 | pin = pctldev->desc->pins[i].number; |
ae6b4d85 LW |
124 | desc = pin_desc_get(pctldev, pin); |
125 | /* Pin space may be sparse */ | |
126 | if (desc == NULL) | |
127 | continue; | |
128 | if (desc->name && !strcmp(name, desc->name)) | |
129 | return pin; | |
130 | } | |
131 | ||
132 | return -EINVAL; | |
133 | } | |
134 | ||
2744e8af LW |
135 | /** |
136 | * pin_is_valid() - check if pin exists on controller | |
137 | * @pctldev: the pin control device to check the pin on | |
138 | * @pin: pin to check, use the local pin controller index number | |
139 | * | |
140 | * This tells us whether a certain pin exist on a certain pin controller or | |
141 | * not. Pin lists may be sparse, so some pins may not exist. | |
142 | */ | |
143 | bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) | |
144 | { | |
145 | struct pin_desc *pindesc; | |
146 | ||
147 | if (pin < 0) | |
148 | return false; | |
149 | ||
150 | pindesc = pin_desc_get(pctldev, pin); | |
151 | if (pindesc == NULL) | |
152 | return false; | |
153 | ||
154 | return true; | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(pin_is_valid); | |
157 | ||
158 | /* Deletes a range of pin descriptors */ | |
159 | static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, | |
160 | const struct pinctrl_pin_desc *pins, | |
161 | unsigned num_pins) | |
162 | { | |
163 | int i; | |
164 | ||
165 | spin_lock(&pctldev->pin_desc_tree_lock); | |
166 | for (i = 0; i < num_pins; i++) { | |
167 | struct pin_desc *pindesc; | |
168 | ||
169 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, | |
170 | pins[i].number); | |
171 | if (pindesc != NULL) { | |
172 | radix_tree_delete(&pctldev->pin_desc_tree, | |
173 | pins[i].number); | |
ca53c5f1 LW |
174 | if (pindesc->dynamic_name) |
175 | kfree(pindesc->name); | |
2744e8af LW |
176 | } |
177 | kfree(pindesc); | |
178 | } | |
179 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
180 | } | |
181 | ||
182 | static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, | |
183 | unsigned number, const char *name) | |
184 | { | |
185 | struct pin_desc *pindesc; | |
186 | ||
187 | pindesc = pin_desc_get(pctldev, number); | |
188 | if (pindesc != NULL) { | |
189 | pr_err("pin %d already registered on %s\n", number, | |
190 | pctldev->desc->name); | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
194 | pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); | |
195 | if (pindesc == NULL) | |
196 | return -ENOMEM; | |
ae6b4d85 | 197 | |
2744e8af LW |
198 | spin_lock_init(&pindesc->lock); |
199 | ||
200 | /* Set owner */ | |
201 | pindesc->pctldev = pctldev; | |
202 | ||
9af1e44f | 203 | /* Copy basic pin info */ |
8dc6ae4d | 204 | if (name) { |
ca53c5f1 LW |
205 | pindesc->name = name; |
206 | } else { | |
207 | pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number); | |
208 | if (pindesc->name == NULL) | |
209 | return -ENOMEM; | |
210 | pindesc->dynamic_name = true; | |
211 | } | |
2744e8af LW |
212 | |
213 | spin_lock(&pctldev->pin_desc_tree_lock); | |
214 | radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); | |
215 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
216 | pr_debug("registered pin %d (%s) on %s\n", | |
ca53c5f1 | 217 | number, pindesc->name, pctldev->desc->name); |
2744e8af LW |
218 | return 0; |
219 | } | |
220 | ||
221 | static int pinctrl_register_pins(struct pinctrl_dev *pctldev, | |
222 | struct pinctrl_pin_desc const *pins, | |
223 | unsigned num_descs) | |
224 | { | |
225 | unsigned i; | |
226 | int ret = 0; | |
227 | ||
228 | for (i = 0; i < num_descs; i++) { | |
229 | ret = pinctrl_register_one_pin(pctldev, | |
230 | pins[i].number, pins[i].name); | |
231 | if (ret) | |
232 | return ret; | |
233 | } | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | /** | |
239 | * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range | |
240 | * @pctldev: pin controller device to check | |
241 | * @gpio: gpio pin to check taken from the global GPIO pin space | |
242 | * | |
243 | * Tries to match a GPIO pin number to the ranges handled by a certain pin | |
244 | * controller, return the range or NULL | |
245 | */ | |
246 | static struct pinctrl_gpio_range * | |
247 | pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) | |
248 | { | |
249 | struct pinctrl_gpio_range *range = NULL; | |
250 | ||
251 | /* Loop over the ranges */ | |
252 | mutex_lock(&pctldev->gpio_ranges_lock); | |
253 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
254 | /* Check if we're in the valid range */ | |
255 | if (gpio >= range->base && | |
256 | gpio < range->base + range->npins) { | |
257 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
258 | return range; | |
259 | } | |
260 | } | |
261 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
262 | ||
263 | return NULL; | |
264 | } | |
265 | ||
266 | /** | |
267 | * pinctrl_get_device_gpio_range() - find device for GPIO range | |
268 | * @gpio: the pin to locate the pin controller for | |
269 | * @outdev: the pin control device if found | |
270 | * @outrange: the GPIO range if found | |
271 | * | |
272 | * Find the pin controller handling a certain GPIO pin from the pinspace of | |
273 | * the GPIO subsystem, return the device and the matching GPIO range. Returns | |
274 | * negative if the GPIO range could not be found in any device. | |
275 | */ | |
276 | int pinctrl_get_device_gpio_range(unsigned gpio, | |
277 | struct pinctrl_dev **outdev, | |
278 | struct pinctrl_gpio_range **outrange) | |
279 | { | |
280 | struct pinctrl_dev *pctldev = NULL; | |
281 | ||
282 | /* Loop over the pin controllers */ | |
283 | mutex_lock(&pinctrldev_list_mutex); | |
284 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
285 | struct pinctrl_gpio_range *range; | |
286 | ||
287 | range = pinctrl_match_gpio_range(pctldev, gpio); | |
288 | if (range != NULL) { | |
289 | *outdev = pctldev; | |
290 | *outrange = range; | |
291 | mutex_unlock(&pinctrldev_list_mutex); | |
292 | return 0; | |
293 | } | |
294 | } | |
295 | mutex_unlock(&pinctrldev_list_mutex); | |
296 | ||
297 | return -EINVAL; | |
298 | } | |
299 | ||
300 | /** | |
301 | * pinctrl_add_gpio_range() - register a GPIO range for a controller | |
302 | * @pctldev: pin controller device to add the range to | |
303 | * @range: the GPIO range to add | |
304 | * | |
305 | * This adds a range of GPIOs to be handled by a certain pin controller. Call | |
306 | * this to register handled ranges after registering your pin controller. | |
307 | */ | |
308 | void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, | |
309 | struct pinctrl_gpio_range *range) | |
310 | { | |
311 | mutex_lock(&pctldev->gpio_ranges_lock); | |
312 | list_add(&range->node, &pctldev->gpio_ranges); | |
313 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
314 | } | |
315 | ||
316 | /** | |
317 | * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller | |
318 | * @pctldev: pin controller device to remove the range from | |
319 | * @range: the GPIO range to remove | |
320 | */ | |
321 | void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, | |
322 | struct pinctrl_gpio_range *range) | |
323 | { | |
324 | mutex_lock(&pctldev->gpio_ranges_lock); | |
325 | list_del(&range->node); | |
326 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
327 | } | |
328 | ||
7afde8ba LW |
329 | /** |
330 | * pinctrl_get_group_selector() - returns the group selector for a group | |
331 | * @pctldev: the pin controller handling the group | |
332 | * @pin_group: the pin group to look up | |
333 | */ | |
334 | int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, | |
335 | const char *pin_group) | |
336 | { | |
337 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
338 | unsigned group_selector = 0; | |
339 | ||
340 | while (pctlops->list_groups(pctldev, group_selector) >= 0) { | |
341 | const char *gname = pctlops->get_group_name(pctldev, | |
342 | group_selector); | |
343 | if (!strcmp(gname, pin_group)) { | |
51cd24ee | 344 | dev_dbg(pctldev->dev, |
7afde8ba LW |
345 | "found group selector %u for %s\n", |
346 | group_selector, | |
347 | pin_group); | |
348 | return group_selector; | |
349 | } | |
350 | ||
351 | group_selector++; | |
352 | } | |
353 | ||
51cd24ee | 354 | dev_err(pctldev->dev, "does not have pin group %s\n", |
7afde8ba LW |
355 | pin_group); |
356 | ||
357 | return -EINVAL; | |
358 | } | |
359 | ||
befe5bdf LW |
360 | /** |
361 | * pinctrl_request_gpio() - request a single pin to be used in as GPIO | |
362 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
363 | * | |
364 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
365 | * as part of their gpio_request() semantics, platforms and individual drivers | |
366 | * shall *NOT* request GPIO pins to be muxed in. | |
367 | */ | |
368 | int pinctrl_request_gpio(unsigned gpio) | |
369 | { | |
370 | struct pinctrl_dev *pctldev; | |
371 | struct pinctrl_gpio_range *range; | |
372 | int ret; | |
373 | int pin; | |
374 | ||
375 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
376 | if (ret) | |
377 | return -EINVAL; | |
378 | ||
379 | /* Convert to the pin controllers number space */ | |
380 | pin = gpio - range->base + range->pin_base; | |
381 | ||
382 | return pinmux_request_gpio(pctldev, range, pin, gpio); | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(pinctrl_request_gpio); | |
385 | ||
386 | /** | |
387 | * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO | |
388 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
389 | * | |
390 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
391 | * as part of their gpio_free() semantics, platforms and individual drivers | |
392 | * shall *NOT* request GPIO pins to be muxed out. | |
393 | */ | |
394 | void pinctrl_free_gpio(unsigned gpio) | |
395 | { | |
396 | struct pinctrl_dev *pctldev; | |
397 | struct pinctrl_gpio_range *range; | |
398 | int ret; | |
399 | int pin; | |
400 | ||
401 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
402 | if (ret) | |
403 | return; | |
404 | ||
405 | /* Convert to the pin controllers number space */ | |
406 | pin = gpio - range->base + range->pin_base; | |
407 | ||
408 | return pinmux_free_gpio(pctldev, pin, range); | |
409 | } | |
410 | EXPORT_SYMBOL_GPL(pinctrl_free_gpio); | |
411 | ||
412 | static int pinctrl_gpio_direction(unsigned gpio, bool input) | |
413 | { | |
414 | struct pinctrl_dev *pctldev; | |
415 | struct pinctrl_gpio_range *range; | |
416 | int ret; | |
417 | int pin; | |
418 | ||
419 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
420 | if (ret) | |
421 | return ret; | |
422 | ||
423 | /* Convert to the pin controllers number space */ | |
424 | pin = gpio - range->base + range->pin_base; | |
425 | ||
426 | return pinmux_gpio_direction(pctldev, range, pin, input); | |
427 | } | |
428 | ||
429 | /** | |
430 | * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode | |
431 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
432 | * | |
433 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
434 | * as part of their gpio_direction_input() semantics, platforms and individual | |
435 | * drivers shall *NOT* touch pin control GPIO calls. | |
436 | */ | |
437 | int pinctrl_gpio_direction_input(unsigned gpio) | |
438 | { | |
439 | return pinctrl_gpio_direction(gpio, true); | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input); | |
442 | ||
443 | /** | |
444 | * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode | |
445 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
446 | * | |
447 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
448 | * as part of their gpio_direction_output() semantics, platforms and individual | |
449 | * drivers shall *NOT* touch pin control GPIO calls. | |
450 | */ | |
451 | int pinctrl_gpio_direction_output(unsigned gpio) | |
452 | { | |
453 | return pinctrl_gpio_direction(gpio, false); | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); | |
456 | ||
457 | /** | |
458 | * pinctrl_get() - retrieves the pin controller handle for a certain device | |
459 | * @dev: the device to get the pin controller handle for | |
460 | * @name: an optional specific control mapping name or NULL, the name is only | |
461 | * needed if you want to have more than one mapping per device, or if you | |
462 | * need an anonymous pin control (not tied to any specific device) | |
463 | */ | |
464 | struct pinctrl *pinctrl_get(struct device *dev, const char *name) | |
465 | { | |
466 | struct pinctrl_map const *map = NULL; | |
467 | struct pinctrl_dev *pctldev = NULL; | |
468 | const char *devname = NULL; | |
469 | struct pinctrl *p; | |
470 | bool found_map; | |
471 | unsigned num_maps = 0; | |
472 | int ret = -ENODEV; | |
473 | int i; | |
474 | ||
475 | /* We must have dev or ID or both */ | |
476 | if (!dev && !name) | |
477 | return ERR_PTR(-EINVAL); | |
478 | ||
479 | if (dev) | |
480 | devname = dev_name(dev); | |
481 | ||
482 | pr_debug("get pin control handle %s for device %s\n", name, | |
483 | devname ? devname : "(none)"); | |
484 | ||
485 | /* | |
486 | * create the state cookie holder struct pinctrl for each | |
487 | * mapping, this is what consumers will get when requesting | |
488 | * a pin control handle with pinctrl_get() | |
489 | */ | |
490 | p = kzalloc(sizeof(struct pinctrl), GFP_KERNEL); | |
491 | if (p == NULL) | |
492 | return ERR_PTR(-ENOMEM); | |
493 | mutex_init(&p->mutex); | |
494 | pinmux_init_pinctrl_handle(p); | |
495 | ||
496 | /* Iterate over the pin control maps to locate the right ones */ | |
497 | for (i = 0; i < pinctrl_maps_num; i++) { | |
498 | map = &pinctrl_maps[i]; | |
499 | found_map = false; | |
500 | ||
501 | /* | |
502 | * First, try to find the pctldev given in the map | |
503 | */ | |
504 | pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); | |
505 | if (!pctldev) { | |
506 | pr_warning("could not find a pinctrl device for pinmux function %s, fishy, they shall all have one\n", | |
507 | map->function); | |
508 | pr_warning("given pinctrl device name: %s", | |
509 | map->ctrl_dev_name); | |
510 | ||
511 | /* Continue to check the other mappings anyway... */ | |
512 | continue; | |
513 | } | |
514 | ||
515 | pr_debug("in map, found pctldev %s to handle function %s", | |
516 | dev_name(pctldev->dev), map->function); | |
517 | ||
518 | ||
519 | /* | |
520 | * If we're looking for a specific named map, this must match, | |
521 | * else we loop and look for the next. | |
522 | */ | |
523 | if (name != NULL) { | |
524 | if (map->name == NULL) | |
525 | continue; | |
526 | if (strcmp(map->name, name)) | |
527 | continue; | |
528 | } | |
529 | ||
530 | /* | |
531 | * This is for the case where no device name is given, we | |
532 | * already know that the function name matches from above | |
533 | * code. | |
534 | */ | |
535 | if (!map->dev_name && (name != NULL)) | |
536 | found_map = true; | |
537 | ||
538 | /* If the mapping has a device set up it must match */ | |
539 | if (map->dev_name && | |
540 | (!devname || !strcmp(map->dev_name, devname))) | |
541 | /* MATCH! */ | |
542 | found_map = true; | |
543 | ||
544 | /* If this map is applicable, then apply it */ | |
545 | if (found_map) { | |
546 | ret = pinmux_apply_muxmap(pctldev, p, dev, | |
547 | devname, map); | |
548 | if (ret) { | |
549 | kfree(p); | |
550 | return ERR_PTR(ret); | |
551 | } | |
552 | num_maps++; | |
553 | } | |
554 | } | |
555 | ||
556 | /* We should have atleast one map, right */ | |
557 | if (!num_maps) { | |
558 | pr_err("could not find any mux maps for device %s, ID %s\n", | |
559 | devname ? devname : "(anonymous)", | |
560 | name ? name : "(undefined)"); | |
561 | kfree(p); | |
562 | return ERR_PTR(-EINVAL); | |
563 | } | |
564 | ||
565 | pr_debug("found %u mux maps for device %s, UD %s\n", | |
566 | num_maps, | |
567 | devname ? devname : "(anonymous)", | |
568 | name ? name : "(undefined)"); | |
569 | ||
570 | /* Add the pinmux to the global list */ | |
571 | mutex_lock(&pinctrl_list_mutex); | |
572 | list_add(&p->node, &pinctrl_list); | |
573 | mutex_unlock(&pinctrl_list_mutex); | |
574 | ||
575 | return p; | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(pinctrl_get); | |
578 | ||
579 | /** | |
580 | * pinctrl_put() - release a previously claimed pin control handle | |
581 | * @p: a pin control handle previously claimed by pinctrl_get() | |
582 | */ | |
583 | void pinctrl_put(struct pinctrl *p) | |
584 | { | |
585 | if (p == NULL) | |
586 | return; | |
587 | ||
588 | mutex_lock(&p->mutex); | |
589 | if (p->usecount) | |
590 | pr_warn("releasing pin control handle with active users!\n"); | |
591 | /* Free the groups and all acquired pins */ | |
592 | pinmux_put(p); | |
593 | mutex_unlock(&p->mutex); | |
594 | ||
595 | /* Remove from list */ | |
596 | mutex_lock(&pinctrl_list_mutex); | |
597 | list_del(&p->node); | |
598 | mutex_unlock(&pinctrl_list_mutex); | |
599 | ||
600 | kfree(p); | |
601 | } | |
602 | EXPORT_SYMBOL_GPL(pinctrl_put); | |
603 | ||
604 | /** | |
605 | * pinctrl_enable() - enable a certain pin controller setting | |
606 | * @p: the pin control handle to enable, previously claimed by pinctrl_get() | |
607 | */ | |
608 | int pinctrl_enable(struct pinctrl *p) | |
609 | { | |
610 | int ret = 0; | |
611 | ||
612 | if (p == NULL) | |
613 | return -EINVAL; | |
614 | mutex_lock(&p->mutex); | |
615 | if (p->usecount++ == 0) { | |
616 | ret = pinmux_enable(p); | |
617 | if (ret) | |
618 | p->usecount--; | |
619 | } | |
620 | mutex_unlock(&p->mutex); | |
621 | return ret; | |
622 | } | |
623 | EXPORT_SYMBOL_GPL(pinctrl_enable); | |
624 | ||
625 | /** | |
626 | * pinctrl_disable() - disable a certain pin control setting | |
627 | * @p: the pin control handle to disable, previously claimed by pinctrl_get() | |
628 | */ | |
629 | void pinctrl_disable(struct pinctrl *p) | |
630 | { | |
631 | if (p == NULL) | |
632 | return; | |
633 | ||
634 | mutex_lock(&p->mutex); | |
635 | if (--p->usecount == 0) { | |
636 | pinmux_disable(p); | |
637 | } | |
638 | mutex_unlock(&p->mutex); | |
639 | } | |
640 | EXPORT_SYMBOL_GPL(pinctrl_disable); | |
641 | ||
642 | /** | |
643 | * pinctrl_register_mappings() - register a set of pin controller mappings | |
13398a4b SW |
644 | * @maps: the pincontrol mappings table to register. This should probably be |
645 | * marked with __initdata so it can be discarded after boot. This | |
646 | * function will perform a shallow copy for the mapping entries. | |
befe5bdf | 647 | * @num_maps: the number of maps in the mapping table |
befe5bdf | 648 | */ |
13398a4b SW |
649 | int pinctrl_register_mappings(struct pinctrl_map const *maps, |
650 | unsigned num_maps) | |
befe5bdf LW |
651 | { |
652 | void *tmp_maps; | |
653 | int i; | |
654 | ||
655 | pr_debug("add %d pinmux maps\n", num_maps); | |
656 | ||
657 | /* First sanity check the new mapping */ | |
658 | for (i = 0; i < num_maps; i++) { | |
659 | if (!maps[i].name) { | |
660 | pr_err("failed to register map %d: no map name given\n", | |
661 | i); | |
662 | return -EINVAL; | |
663 | } | |
664 | ||
665 | if (!maps[i].ctrl_dev_name) { | |
666 | pr_err("failed to register map %s (%d): no pin control device given\n", | |
667 | maps[i].name, i); | |
668 | return -EINVAL; | |
669 | } | |
670 | ||
671 | if (!maps[i].function) { | |
672 | pr_err("failed to register map %s (%d): no function ID given\n", | |
673 | maps[i].name, i); | |
674 | return -EINVAL; | |
675 | } | |
676 | ||
677 | if (!maps[i].dev_name) | |
678 | pr_debug("add system map %s function %s with no device\n", | |
679 | maps[i].name, | |
680 | maps[i].function); | |
681 | else | |
682 | pr_debug("register map %s, function %s\n", | |
683 | maps[i].name, | |
684 | maps[i].function); | |
685 | } | |
686 | ||
687 | /* | |
688 | * Make a copy of the map array - string pointers will end up in the | |
689 | * kernel const section anyway so these do not need to be deep copied. | |
690 | */ | |
691 | if (!pinctrl_maps_num) { | |
692 | /* On first call, just copy them */ | |
693 | tmp_maps = kmemdup(maps, | |
694 | sizeof(struct pinctrl_map) * num_maps, | |
695 | GFP_KERNEL); | |
696 | if (!tmp_maps) | |
697 | return -ENOMEM; | |
698 | } else { | |
699 | /* Subsequent calls, reallocate array to new size */ | |
700 | size_t oldsize = sizeof(struct pinctrl_map) * pinctrl_maps_num; | |
701 | size_t newsize = sizeof(struct pinctrl_map) * num_maps; | |
702 | ||
703 | tmp_maps = krealloc(pinctrl_maps, | |
704 | oldsize + newsize, GFP_KERNEL); | |
705 | if (!tmp_maps) | |
706 | return -ENOMEM; | |
707 | memcpy((tmp_maps + oldsize), maps, newsize); | |
708 | } | |
709 | ||
710 | pinctrl_maps = tmp_maps; | |
711 | pinctrl_maps_num += num_maps; | |
712 | return 0; | |
713 | } | |
714 | ||
715 | /* Hog a single map entry and add to the hoglist */ | |
716 | static int pinctrl_hog_map(struct pinctrl_dev *pctldev, | |
717 | struct pinctrl_map const *map) | |
718 | { | |
719 | struct pinctrl_hog *hog; | |
720 | struct pinctrl *p; | |
721 | int ret; | |
722 | ||
befe5bdf LW |
723 | hog = kzalloc(sizeof(struct pinctrl_hog), GFP_KERNEL); |
724 | if (!hog) | |
725 | return -ENOMEM; | |
726 | ||
449d16b0 | 727 | p = pinctrl_get(pctldev->dev, map->name); |
befe5bdf LW |
728 | if (IS_ERR(p)) { |
729 | kfree(hog); | |
730 | dev_err(pctldev->dev, | |
731 | "could not get the %s pin control mapping for hogging\n", | |
732 | map->name); | |
733 | return PTR_ERR(p); | |
734 | } | |
735 | ||
736 | ret = pinctrl_enable(p); | |
737 | if (ret) { | |
738 | pinctrl_put(p); | |
739 | kfree(hog); | |
740 | dev_err(pctldev->dev, | |
741 | "could not enable the %s pin control mapping for hogging\n", | |
742 | map->name); | |
743 | return ret; | |
744 | } | |
745 | ||
746 | hog->map = map; | |
747 | hog->p = p; | |
748 | ||
749 | dev_info(pctldev->dev, "hogged map %s, function %s\n", map->name, | |
750 | map->function); | |
751 | mutex_lock(&pctldev->pinctrl_hogs_lock); | |
752 | list_add(&hog->node, &pctldev->pinctrl_hogs); | |
753 | mutex_unlock(&pctldev->pinctrl_hogs_lock); | |
754 | ||
755 | return 0; | |
756 | } | |
757 | ||
758 | /** | |
759 | * pinctrl_hog_maps() - hog specific map entries on controller device | |
760 | * @pctldev: the pin control device to hog entries on | |
761 | * | |
762 | * When the pin controllers are registered, there may be some specific pinmux | |
763 | * map entries that need to be hogged, i.e. get+enabled until the system shuts | |
764 | * down. | |
765 | */ | |
766 | int pinctrl_hog_maps(struct pinctrl_dev *pctldev) | |
767 | { | |
768 | struct device *dev = pctldev->dev; | |
769 | const char *devname = dev_name(dev); | |
770 | int ret; | |
771 | int i; | |
772 | ||
773 | INIT_LIST_HEAD(&pctldev->pinctrl_hogs); | |
774 | mutex_init(&pctldev->pinctrl_hogs_lock); | |
775 | ||
776 | for (i = 0; i < pinctrl_maps_num; i++) { | |
777 | struct pinctrl_map const *map = &pinctrl_maps[i]; | |
778 | ||
befe5bdf | 779 | if (map->ctrl_dev_name && |
77a59883 LW |
780 | !strcmp(map->ctrl_dev_name, devname) && |
781 | !strcmp(map->dev_name, devname)) { | |
befe5bdf LW |
782 | /* OK time to hog! */ |
783 | ret = pinctrl_hog_map(pctldev, map); | |
784 | if (ret) | |
785 | return ret; | |
786 | } | |
787 | } | |
788 | return 0; | |
789 | } | |
790 | ||
791 | /** | |
792 | * pinctrl_unhog_maps() - unhog specific map entries on controller device | |
793 | * @pctldev: the pin control device to unhog entries on | |
794 | */ | |
795 | void pinctrl_unhog_maps(struct pinctrl_dev *pctldev) | |
796 | { | |
797 | struct list_head *node, *tmp; | |
798 | ||
799 | mutex_lock(&pctldev->pinctrl_hogs_lock); | |
800 | list_for_each_safe(node, tmp, &pctldev->pinctrl_hogs) { | |
801 | struct pinctrl_hog *hog = | |
802 | list_entry(node, struct pinctrl_hog, node); | |
803 | pinctrl_disable(hog->p); | |
804 | pinctrl_put(hog->p); | |
805 | list_del(node); | |
806 | kfree(hog); | |
807 | } | |
808 | mutex_unlock(&pctldev->pinctrl_hogs_lock); | |
809 | } | |
810 | ||
2744e8af LW |
811 | #ifdef CONFIG_DEBUG_FS |
812 | ||
813 | static int pinctrl_pins_show(struct seq_file *s, void *what) | |
814 | { | |
815 | struct pinctrl_dev *pctldev = s->private; | |
816 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
706e8520 | 817 | unsigned i, pin; |
2744e8af LW |
818 | |
819 | seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); | |
2744e8af | 820 | |
706e8520 CP |
821 | /* The pin number can be retrived from the pin controller descriptor */ |
822 | for (i = 0; i < pctldev->desc->npins; i++) { | |
2744e8af LW |
823 | struct pin_desc *desc; |
824 | ||
706e8520 | 825 | pin = pctldev->desc->pins[i].number; |
2744e8af LW |
826 | desc = pin_desc_get(pctldev, pin); |
827 | /* Pin space may be sparse */ | |
828 | if (desc == NULL) | |
829 | continue; | |
830 | ||
831 | seq_printf(s, "pin %d (%s) ", pin, | |
832 | desc->name ? desc->name : "unnamed"); | |
833 | ||
834 | /* Driver-specific info per pin */ | |
835 | if (ops->pin_dbg_show) | |
836 | ops->pin_dbg_show(pctldev, s, pin); | |
837 | ||
838 | seq_puts(s, "\n"); | |
839 | } | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | static int pinctrl_groups_show(struct seq_file *s, void *what) | |
845 | { | |
846 | struct pinctrl_dev *pctldev = s->private; | |
847 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
848 | unsigned selector = 0; | |
849 | ||
850 | /* No grouping */ | |
851 | if (!ops) | |
852 | return 0; | |
853 | ||
854 | seq_puts(s, "registered pin groups:\n"); | |
855 | while (ops->list_groups(pctldev, selector) >= 0) { | |
a5818a8b | 856 | const unsigned *pins; |
2744e8af LW |
857 | unsigned num_pins; |
858 | const char *gname = ops->get_group_name(pctldev, selector); | |
859 | int ret; | |
860 | int i; | |
861 | ||
862 | ret = ops->get_group_pins(pctldev, selector, | |
863 | &pins, &num_pins); | |
864 | if (ret) | |
865 | seq_printf(s, "%s [ERROR GETTING PINS]\n", | |
866 | gname); | |
867 | else { | |
868 | seq_printf(s, "group: %s, pins = [ ", gname); | |
869 | for (i = 0; i < num_pins; i++) | |
870 | seq_printf(s, "%d ", pins[i]); | |
871 | seq_puts(s, "]\n"); | |
872 | } | |
873 | selector++; | |
874 | } | |
875 | ||
876 | ||
877 | return 0; | |
878 | } | |
879 | ||
880 | static int pinctrl_gpioranges_show(struct seq_file *s, void *what) | |
881 | { | |
882 | struct pinctrl_dev *pctldev = s->private; | |
883 | struct pinctrl_gpio_range *range = NULL; | |
884 | ||
885 | seq_puts(s, "GPIO ranges handled:\n"); | |
886 | ||
887 | /* Loop over the ranges */ | |
888 | mutex_lock(&pctldev->gpio_ranges_lock); | |
889 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
75d6642a LW |
890 | seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
891 | range->id, range->name, | |
892 | range->base, (range->base + range->npins - 1), | |
893 | range->pin_base, | |
894 | (range->pin_base + range->npins - 1)); | |
2744e8af LW |
895 | } |
896 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
befe5bdf LW |
901 | static int pinctrl_maps_show(struct seq_file *s, void *what) |
902 | { | |
903 | int i; | |
904 | ||
905 | seq_puts(s, "Pinctrl maps:\n"); | |
906 | ||
907 | for (i = 0; i < pinctrl_maps_num; i++) { | |
908 | struct pinctrl_map const *map = &pinctrl_maps[i]; | |
909 | ||
910 | seq_printf(s, "%s:\n", map->name); | |
911 | if (map->dev_name) | |
912 | seq_printf(s, " device: %s\n", | |
913 | map->dev_name); | |
914 | else | |
915 | seq_printf(s, " SYSTEM MUX\n"); | |
916 | seq_printf(s, " controlling device %s\n", | |
917 | map->ctrl_dev_name); | |
918 | seq_printf(s, " function: %s\n", map->function); | |
919 | seq_printf(s, " group: %s\n", map->group ? map->group : | |
920 | "(default)"); | |
921 | } | |
922 | return 0; | |
923 | } | |
924 | ||
925 | static int pinmux_hogs_show(struct seq_file *s, void *what) | |
926 | { | |
927 | struct pinctrl_dev *pctldev = s->private; | |
928 | struct pinctrl_hog *hog; | |
929 | ||
930 | seq_puts(s, "Pin control map hogs held by device\n"); | |
931 | ||
932 | list_for_each_entry(hog, &pctldev->pinctrl_hogs, node) | |
933 | seq_printf(s, "%s\n", hog->map->name); | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
2744e8af LW |
938 | static int pinctrl_devices_show(struct seq_file *s, void *what) |
939 | { | |
940 | struct pinctrl_dev *pctldev; | |
941 | ||
ae6b4d85 | 942 | seq_puts(s, "name [pinmux] [pinconf]\n"); |
2744e8af LW |
943 | mutex_lock(&pinctrldev_list_mutex); |
944 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
945 | seq_printf(s, "%s ", pctldev->desc->name); | |
946 | if (pctldev->desc->pmxops) | |
ae6b4d85 LW |
947 | seq_puts(s, "yes "); |
948 | else | |
949 | seq_puts(s, "no "); | |
950 | if (pctldev->desc->confops) | |
2744e8af LW |
951 | seq_puts(s, "yes"); |
952 | else | |
953 | seq_puts(s, "no"); | |
954 | seq_puts(s, "\n"); | |
955 | } | |
956 | mutex_unlock(&pinctrldev_list_mutex); | |
957 | ||
958 | return 0; | |
959 | } | |
960 | ||
befe5bdf LW |
961 | static int pinctrl_show(struct seq_file *s, void *what) |
962 | { | |
963 | struct pinctrl *p; | |
964 | ||
965 | seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); | |
966 | list_for_each_entry(p, &pinctrl_list, node) { | |
967 | struct pinctrl_dev *pctldev = p->pctldev; | |
968 | ||
969 | if (!pctldev) { | |
970 | seq_puts(s, "NO PIN CONTROLLER DEVICE\n"); | |
971 | continue; | |
972 | } | |
973 | ||
974 | seq_printf(s, "device: %s", | |
975 | pinctrl_dev_get_name(p->pctldev)); | |
976 | ||
977 | pinmux_dbg_show(s, p); | |
978 | ||
979 | seq_printf(s, " users: %u map-> %s\n", | |
980 | p->usecount, | |
981 | p->dev ? dev_name(p->dev) : "(system)"); | |
982 | } | |
983 | ||
984 | return 0; | |
985 | } | |
986 | ||
2744e8af LW |
987 | static int pinctrl_pins_open(struct inode *inode, struct file *file) |
988 | { | |
989 | return single_open(file, pinctrl_pins_show, inode->i_private); | |
990 | } | |
991 | ||
992 | static int pinctrl_groups_open(struct inode *inode, struct file *file) | |
993 | { | |
994 | return single_open(file, pinctrl_groups_show, inode->i_private); | |
995 | } | |
996 | ||
997 | static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) | |
998 | { | |
999 | return single_open(file, pinctrl_gpioranges_show, inode->i_private); | |
1000 | } | |
1001 | ||
befe5bdf LW |
1002 | static int pinctrl_maps_open(struct inode *inode, struct file *file) |
1003 | { | |
1004 | return single_open(file, pinctrl_maps_show, inode->i_private); | |
1005 | } | |
1006 | ||
1007 | static int pinmux_hogs_open(struct inode *inode, struct file *file) | |
1008 | { | |
1009 | return single_open(file, pinmux_hogs_show, inode->i_private); | |
1010 | } | |
1011 | ||
2744e8af LW |
1012 | static int pinctrl_devices_open(struct inode *inode, struct file *file) |
1013 | { | |
1014 | return single_open(file, pinctrl_devices_show, NULL); | |
1015 | } | |
1016 | ||
befe5bdf LW |
1017 | static int pinctrl_open(struct inode *inode, struct file *file) |
1018 | { | |
1019 | return single_open(file, pinctrl_show, NULL); | |
1020 | } | |
1021 | ||
2744e8af LW |
1022 | static const struct file_operations pinctrl_pins_ops = { |
1023 | .open = pinctrl_pins_open, | |
1024 | .read = seq_read, | |
1025 | .llseek = seq_lseek, | |
1026 | .release = single_release, | |
1027 | }; | |
1028 | ||
1029 | static const struct file_operations pinctrl_groups_ops = { | |
1030 | .open = pinctrl_groups_open, | |
1031 | .read = seq_read, | |
1032 | .llseek = seq_lseek, | |
1033 | .release = single_release, | |
1034 | }; | |
1035 | ||
1036 | static const struct file_operations pinctrl_gpioranges_ops = { | |
1037 | .open = pinctrl_gpioranges_open, | |
1038 | .read = seq_read, | |
1039 | .llseek = seq_lseek, | |
1040 | .release = single_release, | |
1041 | }; | |
1042 | ||
befe5bdf LW |
1043 | static const struct file_operations pinctrl_maps_ops = { |
1044 | .open = pinctrl_maps_open, | |
1045 | .read = seq_read, | |
1046 | .llseek = seq_lseek, | |
1047 | .release = single_release, | |
1048 | }; | |
1049 | ||
1050 | static const struct file_operations pinmux_hogs_ops = { | |
1051 | .open = pinmux_hogs_open, | |
1052 | .read = seq_read, | |
1053 | .llseek = seq_lseek, | |
1054 | .release = single_release, | |
1055 | }; | |
1056 | ||
2744e8af LW |
1057 | static const struct file_operations pinctrl_devices_ops = { |
1058 | .open = pinctrl_devices_open, | |
1059 | .read = seq_read, | |
1060 | .llseek = seq_lseek, | |
1061 | .release = single_release, | |
1062 | }; | |
1063 | ||
befe5bdf LW |
1064 | static const struct file_operations pinctrl_ops = { |
1065 | .open = pinctrl_open, | |
1066 | .read = seq_read, | |
1067 | .llseek = seq_lseek, | |
1068 | .release = single_release, | |
1069 | }; | |
1070 | ||
2744e8af LW |
1071 | static struct dentry *debugfs_root; |
1072 | ||
1073 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
1074 | { | |
02157160 | 1075 | struct dentry *device_root; |
2744e8af | 1076 | |
51cd24ee | 1077 | device_root = debugfs_create_dir(dev_name(pctldev->dev), |
2744e8af | 1078 | debugfs_root); |
02157160 TL |
1079 | pctldev->device_root = device_root; |
1080 | ||
2744e8af LW |
1081 | if (IS_ERR(device_root) || !device_root) { |
1082 | pr_warn("failed to create debugfs directory for %s\n", | |
51cd24ee | 1083 | dev_name(pctldev->dev)); |
2744e8af LW |
1084 | return; |
1085 | } | |
1086 | debugfs_create_file("pins", S_IFREG | S_IRUGO, | |
1087 | device_root, pctldev, &pinctrl_pins_ops); | |
1088 | debugfs_create_file("pingroups", S_IFREG | S_IRUGO, | |
1089 | device_root, pctldev, &pinctrl_groups_ops); | |
1090 | debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, | |
1091 | device_root, pctldev, &pinctrl_gpioranges_ops); | |
befe5bdf LW |
1092 | debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, |
1093 | device_root, pctldev, &pinctrl_maps_ops); | |
1094 | debugfs_create_file("pinmux-hogs", S_IFREG | S_IRUGO, | |
1095 | device_root, pctldev, &pinmux_hogs_ops); | |
2744e8af | 1096 | pinmux_init_device_debugfs(device_root, pctldev); |
ae6b4d85 | 1097 | pinconf_init_device_debugfs(device_root, pctldev); |
2744e8af LW |
1098 | } |
1099 | ||
02157160 TL |
1100 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1101 | { | |
1102 | debugfs_remove_recursive(pctldev->device_root); | |
1103 | } | |
1104 | ||
2744e8af LW |
1105 | static void pinctrl_init_debugfs(void) |
1106 | { | |
1107 | debugfs_root = debugfs_create_dir("pinctrl", NULL); | |
1108 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
1109 | pr_warn("failed to create debugfs directory\n"); | |
1110 | debugfs_root = NULL; | |
1111 | return; | |
1112 | } | |
1113 | ||
1114 | debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, | |
1115 | debugfs_root, NULL, &pinctrl_devices_ops); | |
befe5bdf LW |
1116 | debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, |
1117 | debugfs_root, NULL, &pinctrl_ops); | |
2744e8af LW |
1118 | } |
1119 | ||
1120 | #else /* CONFIG_DEBUG_FS */ | |
1121 | ||
1122 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
1123 | { | |
1124 | } | |
1125 | ||
1126 | static void pinctrl_init_debugfs(void) | |
1127 | { | |
1128 | } | |
1129 | ||
02157160 TL |
1130 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1131 | { | |
1132 | } | |
1133 | ||
2744e8af LW |
1134 | #endif |
1135 | ||
1136 | /** | |
1137 | * pinctrl_register() - register a pin controller device | |
1138 | * @pctldesc: descriptor for this pin controller | |
1139 | * @dev: parent device for this pin controller | |
1140 | * @driver_data: private pin controller data for this pin controller | |
1141 | */ | |
1142 | struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, | |
1143 | struct device *dev, void *driver_data) | |
1144 | { | |
2744e8af LW |
1145 | struct pinctrl_dev *pctldev; |
1146 | int ret; | |
1147 | ||
1148 | if (pctldesc == NULL) | |
1149 | return NULL; | |
1150 | if (pctldesc->name == NULL) | |
1151 | return NULL; | |
1152 | ||
b9130b77 TL |
1153 | pctldev = kzalloc(sizeof(struct pinctrl_dev), GFP_KERNEL); |
1154 | if (pctldev == NULL) | |
1155 | return NULL; | |
1156 | ||
1157 | /* Initialize pin control device struct */ | |
1158 | pctldev->owner = pctldesc->owner; | |
1159 | pctldev->desc = pctldesc; | |
1160 | pctldev->driver_data = driver_data; | |
1161 | INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); | |
1162 | spin_lock_init(&pctldev->pin_desc_tree_lock); | |
1163 | INIT_LIST_HEAD(&pctldev->gpio_ranges); | |
1164 | mutex_init(&pctldev->gpio_ranges_lock); | |
1165 | pctldev->dev = dev; | |
1166 | ||
2744e8af LW |
1167 | /* If we're implementing pinmuxing, check the ops for sanity */ |
1168 | if (pctldesc->pmxops) { | |
b9130b77 | 1169 | ret = pinmux_check_ops(pctldev); |
2744e8af LW |
1170 | if (ret) { |
1171 | pr_err("%s pinmux ops lacks necessary functions\n", | |
1172 | pctldesc->name); | |
b9130b77 | 1173 | goto out_err; |
2744e8af LW |
1174 | } |
1175 | } | |
1176 | ||
ae6b4d85 LW |
1177 | /* If we're implementing pinconfig, check the ops for sanity */ |
1178 | if (pctldesc->confops) { | |
b9130b77 | 1179 | ret = pinconf_check_ops(pctldev); |
ae6b4d85 LW |
1180 | if (ret) { |
1181 | pr_err("%s pin config ops lacks necessary functions\n", | |
1182 | pctldesc->name); | |
b9130b77 | 1183 | goto out_err; |
ae6b4d85 LW |
1184 | } |
1185 | } | |
1186 | ||
2744e8af LW |
1187 | /* Register all the pins */ |
1188 | pr_debug("try to register %d pins on %s...\n", | |
1189 | pctldesc->npins, pctldesc->name); | |
1190 | ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); | |
1191 | if (ret) { | |
1192 | pr_err("error during pin registration\n"); | |
1193 | pinctrl_free_pindescs(pctldev, pctldesc->pins, | |
1194 | pctldesc->npins); | |
51cd24ee | 1195 | goto out_err; |
2744e8af LW |
1196 | } |
1197 | ||
1198 | pinctrl_init_device_debugfs(pctldev); | |
1199 | mutex_lock(&pinctrldev_list_mutex); | |
1200 | list_add(&pctldev->node, &pinctrldev_list); | |
1201 | mutex_unlock(&pinctrldev_list_mutex); | |
e93bcee0 | 1202 | pinctrl_hog_maps(pctldev); |
2744e8af LW |
1203 | return pctldev; |
1204 | ||
51cd24ee SW |
1205 | out_err: |
1206 | kfree(pctldev); | |
2744e8af LW |
1207 | return NULL; |
1208 | } | |
1209 | EXPORT_SYMBOL_GPL(pinctrl_register); | |
1210 | ||
1211 | /** | |
1212 | * pinctrl_unregister() - unregister pinmux | |
1213 | * @pctldev: pin controller to unregister | |
1214 | * | |
1215 | * Called by pinmux drivers to unregister a pinmux. | |
1216 | */ | |
1217 | void pinctrl_unregister(struct pinctrl_dev *pctldev) | |
1218 | { | |
1219 | if (pctldev == NULL) | |
1220 | return; | |
1221 | ||
02157160 | 1222 | pinctrl_remove_device_debugfs(pctldev); |
e93bcee0 | 1223 | pinctrl_unhog_maps(pctldev); |
2744e8af LW |
1224 | /* TODO: check that no pinmuxes are still active? */ |
1225 | mutex_lock(&pinctrldev_list_mutex); | |
1226 | list_del(&pctldev->node); | |
1227 | mutex_unlock(&pinctrldev_list_mutex); | |
1228 | /* Destroy descriptor tree */ | |
1229 | pinctrl_free_pindescs(pctldev, pctldev->desc->pins, | |
1230 | pctldev->desc->npins); | |
51cd24ee | 1231 | kfree(pctldev); |
2744e8af LW |
1232 | } |
1233 | EXPORT_SYMBOL_GPL(pinctrl_unregister); | |
1234 | ||
1235 | static int __init pinctrl_init(void) | |
1236 | { | |
1237 | pr_info("initialized pinctrl subsystem\n"); | |
1238 | pinctrl_init_debugfs(); | |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | /* init early since many drivers really need to initialized pinmux early */ | |
1243 | core_initcall(pinctrl_init); |