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 | * | |
b2b3e66e SW |
10 | * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. |
11 | * | |
2744e8af LW |
12 | * License terms: GNU General Public License (GPL) version 2 |
13 | */ | |
14 | #define pr_fmt(fmt) "pinctrl core: " fmt | |
15 | ||
16 | #include <linux/kernel.h> | |
a5a697cd | 17 | #include <linux/export.h> |
2744e8af LW |
18 | #include <linux/init.h> |
19 | #include <linux/device.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/radix-tree.h> | |
22 | #include <linux/err.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/mutex.h> | |
25 | #include <linux/spinlock.h> | |
26 | #include <linux/sysfs.h> | |
27 | #include <linux/debugfs.h> | |
28 | #include <linux/seq_file.h> | |
29 | #include <linux/pinctrl/pinctrl.h> | |
30 | #include <linux/pinctrl/machine.h> | |
31 | #include "core.h" | |
32 | #include "pinmux.h" | |
ae6b4d85 | 33 | #include "pinconf.h" |
2744e8af | 34 | |
b2b3e66e SW |
35 | /** |
36 | * struct pinctrl_maps - a list item containing part of the mapping table | |
37 | * @node: mapping table list node | |
38 | * @maps: array of mapping table entries | |
39 | * @num_maps: the number of entries in @maps | |
40 | */ | |
41 | struct pinctrl_maps { | |
42 | struct list_head node; | |
43 | struct pinctrl_map const *maps; | |
44 | unsigned num_maps; | |
45 | }; | |
46 | ||
befe5bdf LW |
47 | /** |
48 | * struct pinctrl_hog - a list item to stash control hogs | |
49 | * @node: pin control hog list node | |
50 | * @map: map entry responsible for this hogging | |
51 | * @pmx: the pin control hogged by this item | |
52 | */ | |
53 | struct pinctrl_hog { | |
54 | struct list_head node; | |
55 | struct pinctrl_map const *map; | |
56 | struct pinctrl *p; | |
57 | }; | |
58 | ||
2744e8af LW |
59 | /* Global list of pin control devices */ |
60 | static DEFINE_MUTEX(pinctrldev_list_mutex); | |
61 | static LIST_HEAD(pinctrldev_list); | |
62 | ||
befe5bdf LW |
63 | /* List of pin controller handles */ |
64 | static DEFINE_MUTEX(pinctrl_list_mutex); | |
65 | static LIST_HEAD(pinctrl_list); | |
66 | ||
67 | /* Global pinctrl maps */ | |
b2b3e66e SW |
68 | static DEFINE_MUTEX(pinctrl_maps_mutex); |
69 | static LIST_HEAD(pinctrl_maps); | |
70 | ||
71 | #define for_each_maps(_maps_node_, _i_, _map_) \ | |
72 | list_for_each_entry(_maps_node_, &pinctrl_maps, node) \ | |
73 | for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \ | |
74 | _i_ < _maps_node_->num_maps; \ | |
75 | i++, _map_ = &_maps_node_->maps[_i_]) | |
befe5bdf | 76 | |
2744e8af LW |
77 | const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) |
78 | { | |
79 | /* We're not allowed to register devices without name */ | |
80 | return pctldev->desc->name; | |
81 | } | |
82 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); | |
83 | ||
84 | void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) | |
85 | { | |
86 | return pctldev->driver_data; | |
87 | } | |
88 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); | |
89 | ||
90 | /** | |
9dfac4fd LW |
91 | * get_pinctrl_dev_from_devname() - look up pin controller device |
92 | * @devname: the name of a device instance, as returned by dev_name() | |
2744e8af LW |
93 | * |
94 | * Looks up a pin control device matching a certain device name or pure device | |
95 | * pointer, the pure device pointer will take precedence. | |
96 | */ | |
9dfac4fd | 97 | struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname) |
2744e8af LW |
98 | { |
99 | struct pinctrl_dev *pctldev = NULL; | |
100 | bool found = false; | |
101 | ||
9dfac4fd LW |
102 | if (!devname) |
103 | return NULL; | |
104 | ||
2744e8af LW |
105 | mutex_lock(&pinctrldev_list_mutex); |
106 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
9dfac4fd | 107 | if (!strcmp(dev_name(pctldev->dev), devname)) { |
2744e8af LW |
108 | /* Matched on device name */ |
109 | found = true; | |
110 | break; | |
111 | } | |
112 | } | |
113 | mutex_unlock(&pinctrldev_list_mutex); | |
114 | ||
115 | return found ? pctldev : NULL; | |
116 | } | |
117 | ||
33d58949 | 118 | struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, unsigned int pin) |
2744e8af LW |
119 | { |
120 | struct pin_desc *pindesc; | |
121 | unsigned long flags; | |
122 | ||
123 | spin_lock_irqsave(&pctldev->pin_desc_tree_lock, flags); | |
124 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, pin); | |
125 | spin_unlock_irqrestore(&pctldev->pin_desc_tree_lock, flags); | |
126 | ||
127 | return pindesc; | |
128 | } | |
129 | ||
ae6b4d85 LW |
130 | /** |
131 | * pin_get_from_name() - look up a pin number from a name | |
132 | * @pctldev: the pin control device to lookup the pin on | |
133 | * @name: the name of the pin to look up | |
134 | */ | |
135 | int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) | |
136 | { | |
706e8520 | 137 | unsigned i, pin; |
ae6b4d85 | 138 | |
706e8520 CP |
139 | /* The pin number can be retrived from the pin controller descriptor */ |
140 | for (i = 0; i < pctldev->desc->npins; i++) { | |
ae6b4d85 LW |
141 | struct pin_desc *desc; |
142 | ||
706e8520 | 143 | pin = pctldev->desc->pins[i].number; |
ae6b4d85 LW |
144 | desc = pin_desc_get(pctldev, pin); |
145 | /* Pin space may be sparse */ | |
146 | if (desc == NULL) | |
147 | continue; | |
148 | if (desc->name && !strcmp(name, desc->name)) | |
149 | return pin; | |
150 | } | |
151 | ||
152 | return -EINVAL; | |
153 | } | |
154 | ||
2744e8af LW |
155 | /** |
156 | * pin_is_valid() - check if pin exists on controller | |
157 | * @pctldev: the pin control device to check the pin on | |
158 | * @pin: pin to check, use the local pin controller index number | |
159 | * | |
160 | * This tells us whether a certain pin exist on a certain pin controller or | |
161 | * not. Pin lists may be sparse, so some pins may not exist. | |
162 | */ | |
163 | bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) | |
164 | { | |
165 | struct pin_desc *pindesc; | |
166 | ||
167 | if (pin < 0) | |
168 | return false; | |
169 | ||
170 | pindesc = pin_desc_get(pctldev, pin); | |
171 | if (pindesc == NULL) | |
172 | return false; | |
173 | ||
174 | return true; | |
175 | } | |
176 | EXPORT_SYMBOL_GPL(pin_is_valid); | |
177 | ||
178 | /* Deletes a range of pin descriptors */ | |
179 | static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, | |
180 | const struct pinctrl_pin_desc *pins, | |
181 | unsigned num_pins) | |
182 | { | |
183 | int i; | |
184 | ||
185 | spin_lock(&pctldev->pin_desc_tree_lock); | |
186 | for (i = 0; i < num_pins; i++) { | |
187 | struct pin_desc *pindesc; | |
188 | ||
189 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, | |
190 | pins[i].number); | |
191 | if (pindesc != NULL) { | |
192 | radix_tree_delete(&pctldev->pin_desc_tree, | |
193 | pins[i].number); | |
ca53c5f1 LW |
194 | if (pindesc->dynamic_name) |
195 | kfree(pindesc->name); | |
2744e8af LW |
196 | } |
197 | kfree(pindesc); | |
198 | } | |
199 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
200 | } | |
201 | ||
202 | static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, | |
203 | unsigned number, const char *name) | |
204 | { | |
205 | struct pin_desc *pindesc; | |
206 | ||
207 | pindesc = pin_desc_get(pctldev, number); | |
208 | if (pindesc != NULL) { | |
209 | pr_err("pin %d already registered on %s\n", number, | |
210 | pctldev->desc->name); | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); | |
215 | if (pindesc == NULL) | |
216 | return -ENOMEM; | |
ae6b4d85 | 217 | |
2744e8af LW |
218 | spin_lock_init(&pindesc->lock); |
219 | ||
220 | /* Set owner */ | |
221 | pindesc->pctldev = pctldev; | |
222 | ||
9af1e44f | 223 | /* Copy basic pin info */ |
8dc6ae4d | 224 | if (name) { |
ca53c5f1 LW |
225 | pindesc->name = name; |
226 | } else { | |
227 | pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number); | |
228 | if (pindesc->name == NULL) | |
229 | return -ENOMEM; | |
230 | pindesc->dynamic_name = true; | |
231 | } | |
2744e8af LW |
232 | |
233 | spin_lock(&pctldev->pin_desc_tree_lock); | |
234 | radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); | |
235 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
236 | pr_debug("registered pin %d (%s) on %s\n", | |
ca53c5f1 | 237 | number, pindesc->name, pctldev->desc->name); |
2744e8af LW |
238 | return 0; |
239 | } | |
240 | ||
241 | static int pinctrl_register_pins(struct pinctrl_dev *pctldev, | |
242 | struct pinctrl_pin_desc const *pins, | |
243 | unsigned num_descs) | |
244 | { | |
245 | unsigned i; | |
246 | int ret = 0; | |
247 | ||
248 | for (i = 0; i < num_descs; i++) { | |
249 | ret = pinctrl_register_one_pin(pctldev, | |
250 | pins[i].number, pins[i].name); | |
251 | if (ret) | |
252 | return ret; | |
253 | } | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | /** | |
259 | * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range | |
260 | * @pctldev: pin controller device to check | |
261 | * @gpio: gpio pin to check taken from the global GPIO pin space | |
262 | * | |
263 | * Tries to match a GPIO pin number to the ranges handled by a certain pin | |
264 | * controller, return the range or NULL | |
265 | */ | |
266 | static struct pinctrl_gpio_range * | |
267 | pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) | |
268 | { | |
269 | struct pinctrl_gpio_range *range = NULL; | |
270 | ||
271 | /* Loop over the ranges */ | |
272 | mutex_lock(&pctldev->gpio_ranges_lock); | |
273 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
274 | /* Check if we're in the valid range */ | |
275 | if (gpio >= range->base && | |
276 | gpio < range->base + range->npins) { | |
277 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
278 | return range; | |
279 | } | |
280 | } | |
281 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
282 | ||
283 | return NULL; | |
284 | } | |
285 | ||
286 | /** | |
287 | * pinctrl_get_device_gpio_range() - find device for GPIO range | |
288 | * @gpio: the pin to locate the pin controller for | |
289 | * @outdev: the pin control device if found | |
290 | * @outrange: the GPIO range if found | |
291 | * | |
292 | * Find the pin controller handling a certain GPIO pin from the pinspace of | |
293 | * the GPIO subsystem, return the device and the matching GPIO range. Returns | |
294 | * negative if the GPIO range could not be found in any device. | |
295 | */ | |
4ecce45d SW |
296 | static int pinctrl_get_device_gpio_range(unsigned gpio, |
297 | struct pinctrl_dev **outdev, | |
298 | struct pinctrl_gpio_range **outrange) | |
2744e8af LW |
299 | { |
300 | struct pinctrl_dev *pctldev = NULL; | |
301 | ||
302 | /* Loop over the pin controllers */ | |
303 | mutex_lock(&pinctrldev_list_mutex); | |
304 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
305 | struct pinctrl_gpio_range *range; | |
306 | ||
307 | range = pinctrl_match_gpio_range(pctldev, gpio); | |
308 | if (range != NULL) { | |
309 | *outdev = pctldev; | |
310 | *outrange = range; | |
311 | mutex_unlock(&pinctrldev_list_mutex); | |
312 | return 0; | |
313 | } | |
314 | } | |
315 | mutex_unlock(&pinctrldev_list_mutex); | |
316 | ||
317 | return -EINVAL; | |
318 | } | |
319 | ||
320 | /** | |
321 | * pinctrl_add_gpio_range() - register a GPIO range for a controller | |
322 | * @pctldev: pin controller device to add the range to | |
323 | * @range: the GPIO range to add | |
324 | * | |
325 | * This adds a range of GPIOs to be handled by a certain pin controller. Call | |
326 | * this to register handled ranges after registering your pin controller. | |
327 | */ | |
328 | void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, | |
329 | struct pinctrl_gpio_range *range) | |
330 | { | |
331 | mutex_lock(&pctldev->gpio_ranges_lock); | |
8b9c139f | 332 | list_add_tail(&range->node, &pctldev->gpio_ranges); |
2744e8af LW |
333 | mutex_unlock(&pctldev->gpio_ranges_lock); |
334 | } | |
4ecce45d | 335 | EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range); |
2744e8af LW |
336 | |
337 | /** | |
338 | * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller | |
339 | * @pctldev: pin controller device to remove the range from | |
340 | * @range: the GPIO range to remove | |
341 | */ | |
342 | void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, | |
343 | struct pinctrl_gpio_range *range) | |
344 | { | |
345 | mutex_lock(&pctldev->gpio_ranges_lock); | |
346 | list_del(&range->node); | |
347 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
348 | } | |
4ecce45d | 349 | EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range); |
2744e8af | 350 | |
7afde8ba LW |
351 | /** |
352 | * pinctrl_get_group_selector() - returns the group selector for a group | |
353 | * @pctldev: the pin controller handling the group | |
354 | * @pin_group: the pin group to look up | |
355 | */ | |
356 | int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, | |
357 | const char *pin_group) | |
358 | { | |
359 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
360 | unsigned group_selector = 0; | |
361 | ||
362 | while (pctlops->list_groups(pctldev, group_selector) >= 0) { | |
363 | const char *gname = pctlops->get_group_name(pctldev, | |
364 | group_selector); | |
365 | if (!strcmp(gname, pin_group)) { | |
51cd24ee | 366 | dev_dbg(pctldev->dev, |
7afde8ba LW |
367 | "found group selector %u for %s\n", |
368 | group_selector, | |
369 | pin_group); | |
370 | return group_selector; | |
371 | } | |
372 | ||
373 | group_selector++; | |
374 | } | |
375 | ||
51cd24ee | 376 | dev_err(pctldev->dev, "does not have pin group %s\n", |
7afde8ba LW |
377 | pin_group); |
378 | ||
379 | return -EINVAL; | |
380 | } | |
381 | ||
befe5bdf LW |
382 | /** |
383 | * pinctrl_request_gpio() - request a single pin to be used in as GPIO | |
384 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
385 | * | |
386 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
387 | * as part of their gpio_request() semantics, platforms and individual drivers | |
388 | * shall *NOT* request GPIO pins to be muxed in. | |
389 | */ | |
390 | int pinctrl_request_gpio(unsigned gpio) | |
391 | { | |
392 | struct pinctrl_dev *pctldev; | |
393 | struct pinctrl_gpio_range *range; | |
394 | int ret; | |
395 | int pin; | |
396 | ||
397 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
398 | if (ret) | |
399 | return -EINVAL; | |
400 | ||
401 | /* Convert to the pin controllers number space */ | |
402 | pin = gpio - range->base + range->pin_base; | |
403 | ||
404 | return pinmux_request_gpio(pctldev, range, pin, gpio); | |
405 | } | |
406 | EXPORT_SYMBOL_GPL(pinctrl_request_gpio); | |
407 | ||
408 | /** | |
409 | * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO | |
410 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
411 | * | |
412 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
413 | * as part of their gpio_free() semantics, platforms and individual drivers | |
414 | * shall *NOT* request GPIO pins to be muxed out. | |
415 | */ | |
416 | void pinctrl_free_gpio(unsigned gpio) | |
417 | { | |
418 | struct pinctrl_dev *pctldev; | |
419 | struct pinctrl_gpio_range *range; | |
420 | int ret; | |
421 | int pin; | |
422 | ||
423 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
424 | if (ret) | |
425 | return; | |
426 | ||
427 | /* Convert to the pin controllers number space */ | |
428 | pin = gpio - range->base + range->pin_base; | |
429 | ||
430 | return pinmux_free_gpio(pctldev, pin, range); | |
431 | } | |
432 | EXPORT_SYMBOL_GPL(pinctrl_free_gpio); | |
433 | ||
434 | static int pinctrl_gpio_direction(unsigned gpio, bool input) | |
435 | { | |
436 | struct pinctrl_dev *pctldev; | |
437 | struct pinctrl_gpio_range *range; | |
438 | int ret; | |
439 | int pin; | |
440 | ||
441 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
442 | if (ret) | |
443 | return ret; | |
444 | ||
445 | /* Convert to the pin controllers number space */ | |
446 | pin = gpio - range->base + range->pin_base; | |
447 | ||
448 | return pinmux_gpio_direction(pctldev, range, pin, input); | |
449 | } | |
450 | ||
451 | /** | |
452 | * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode | |
453 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
454 | * | |
455 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
456 | * as part of their gpio_direction_input() semantics, platforms and individual | |
457 | * drivers shall *NOT* touch pin control GPIO calls. | |
458 | */ | |
459 | int pinctrl_gpio_direction_input(unsigned gpio) | |
460 | { | |
461 | return pinctrl_gpio_direction(gpio, true); | |
462 | } | |
463 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input); | |
464 | ||
465 | /** | |
466 | * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode | |
467 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
468 | * | |
469 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
470 | * as part of their gpio_direction_output() semantics, platforms and individual | |
471 | * drivers shall *NOT* touch pin control GPIO calls. | |
472 | */ | |
473 | int pinctrl_gpio_direction_output(unsigned gpio) | |
474 | { | |
475 | return pinctrl_gpio_direction(gpio, false); | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); | |
478 | ||
b2b3e66e | 479 | static struct pinctrl *pinctrl_get_locked(struct device *dev, const char *name) |
befe5bdf | 480 | { |
befe5bdf LW |
481 | struct pinctrl_dev *pctldev = NULL; |
482 | const char *devname = NULL; | |
483 | struct pinctrl *p; | |
484 | bool found_map; | |
485 | unsigned num_maps = 0; | |
486 | int ret = -ENODEV; | |
b2b3e66e | 487 | struct pinctrl_maps *maps_node; |
befe5bdf | 488 | int i; |
b2b3e66e | 489 | struct pinctrl_map const *map; |
befe5bdf LW |
490 | |
491 | /* We must have dev or ID or both */ | |
492 | if (!dev && !name) | |
493 | return ERR_PTR(-EINVAL); | |
494 | ||
495 | if (dev) | |
496 | devname = dev_name(dev); | |
497 | ||
498 | pr_debug("get pin control handle %s for device %s\n", name, | |
499 | devname ? devname : "(none)"); | |
500 | ||
501 | /* | |
502 | * create the state cookie holder struct pinctrl for each | |
503 | * mapping, this is what consumers will get when requesting | |
504 | * a pin control handle with pinctrl_get() | |
505 | */ | |
506 | p = kzalloc(sizeof(struct pinctrl), GFP_KERNEL); | |
507 | if (p == NULL) | |
508 | return ERR_PTR(-ENOMEM); | |
509 | mutex_init(&p->mutex); | |
510 | pinmux_init_pinctrl_handle(p); | |
511 | ||
512 | /* Iterate over the pin control maps to locate the right ones */ | |
b2b3e66e | 513 | for_each_maps(maps_node, i, map) { |
befe5bdf LW |
514 | found_map = false; |
515 | ||
516 | /* | |
517 | * First, try to find the pctldev given in the map | |
518 | */ | |
519 | pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); | |
520 | if (!pctldev) { | |
521 | pr_warning("could not find a pinctrl device for pinmux function %s, fishy, they shall all have one\n", | |
522 | map->function); | |
523 | pr_warning("given pinctrl device name: %s", | |
524 | map->ctrl_dev_name); | |
525 | ||
526 | /* Continue to check the other mappings anyway... */ | |
527 | continue; | |
528 | } | |
529 | ||
530 | pr_debug("in map, found pctldev %s to handle function %s", | |
531 | dev_name(pctldev->dev), map->function); | |
532 | ||
befe5bdf LW |
533 | /* |
534 | * If we're looking for a specific named map, this must match, | |
535 | * else we loop and look for the next. | |
536 | */ | |
537 | if (name != NULL) { | |
538 | if (map->name == NULL) | |
539 | continue; | |
540 | if (strcmp(map->name, name)) | |
541 | continue; | |
542 | } | |
543 | ||
544 | /* | |
545 | * This is for the case where no device name is given, we | |
546 | * already know that the function name matches from above | |
547 | * code. | |
548 | */ | |
549 | if (!map->dev_name && (name != NULL)) | |
550 | found_map = true; | |
551 | ||
552 | /* If the mapping has a device set up it must match */ | |
553 | if (map->dev_name && | |
554 | (!devname || !strcmp(map->dev_name, devname))) | |
555 | /* MATCH! */ | |
556 | found_map = true; | |
557 | ||
558 | /* If this map is applicable, then apply it */ | |
559 | if (found_map) { | |
560 | ret = pinmux_apply_muxmap(pctldev, p, dev, | |
561 | devname, map); | |
562 | if (ret) { | |
563 | kfree(p); | |
564 | return ERR_PTR(ret); | |
565 | } | |
566 | num_maps++; | |
567 | } | |
568 | } | |
569 | ||
f026fe3d SW |
570 | /* |
571 | * This may be perfectly legitimate. An IP block may get re-used | |
572 | * across SoCs. Not all of those SoCs may need pinmux settings for the | |
573 | * IP block, e.g. if one SoC dedicates pins to that function but | |
574 | * another doesn't. The driver won't know this, and will always | |
575 | * attempt to set up the pinmux. The mapping table defines whether any | |
576 | * HW programming is actually needed. | |
577 | */ | |
578 | if (!num_maps) | |
579 | dev_info(dev, "zero maps found for mapping %s\n", name); | |
befe5bdf LW |
580 | |
581 | pr_debug("found %u mux maps for device %s, UD %s\n", | |
582 | num_maps, | |
583 | devname ? devname : "(anonymous)", | |
584 | name ? name : "(undefined)"); | |
585 | ||
586 | /* Add the pinmux to the global list */ | |
587 | mutex_lock(&pinctrl_list_mutex); | |
8b9c139f | 588 | list_add_tail(&p->node, &pinctrl_list); |
befe5bdf LW |
589 | mutex_unlock(&pinctrl_list_mutex); |
590 | ||
591 | return p; | |
592 | } | |
b2b3e66e SW |
593 | |
594 | /** | |
595 | * pinctrl_get() - retrieves the pin controller handle for a certain device | |
596 | * @dev: the device to get the pin controller handle for | |
597 | * @name: an optional specific control mapping name or NULL, the name is only | |
598 | * needed if you want to have more than one mapping per device, or if you | |
599 | * need an anonymous pin control (not tied to any specific device) | |
600 | */ | |
601 | struct pinctrl *pinctrl_get(struct device *dev, const char *name) | |
602 | { | |
603 | struct pinctrl *p; | |
604 | ||
605 | mutex_lock(&pinctrl_maps_mutex); | |
606 | p = pinctrl_get_locked(dev, name); | |
607 | mutex_unlock(&pinctrl_maps_mutex); | |
608 | ||
609 | return p; | |
610 | } | |
befe5bdf LW |
611 | EXPORT_SYMBOL_GPL(pinctrl_get); |
612 | ||
613 | /** | |
614 | * pinctrl_put() - release a previously claimed pin control handle | |
615 | * @p: a pin control handle previously claimed by pinctrl_get() | |
616 | */ | |
617 | void pinctrl_put(struct pinctrl *p) | |
618 | { | |
619 | if (p == NULL) | |
620 | return; | |
621 | ||
622 | mutex_lock(&p->mutex); | |
623 | if (p->usecount) | |
624 | pr_warn("releasing pin control handle with active users!\n"); | |
625 | /* Free the groups and all acquired pins */ | |
626 | pinmux_put(p); | |
627 | mutex_unlock(&p->mutex); | |
628 | ||
629 | /* Remove from list */ | |
630 | mutex_lock(&pinctrl_list_mutex); | |
631 | list_del(&p->node); | |
632 | mutex_unlock(&pinctrl_list_mutex); | |
633 | ||
634 | kfree(p); | |
635 | } | |
636 | EXPORT_SYMBOL_GPL(pinctrl_put); | |
637 | ||
638 | /** | |
639 | * pinctrl_enable() - enable a certain pin controller setting | |
640 | * @p: the pin control handle to enable, previously claimed by pinctrl_get() | |
641 | */ | |
642 | int pinctrl_enable(struct pinctrl *p) | |
643 | { | |
644 | int ret = 0; | |
645 | ||
646 | if (p == NULL) | |
647 | return -EINVAL; | |
648 | mutex_lock(&p->mutex); | |
649 | if (p->usecount++ == 0) { | |
650 | ret = pinmux_enable(p); | |
651 | if (ret) | |
652 | p->usecount--; | |
653 | } | |
654 | mutex_unlock(&p->mutex); | |
655 | return ret; | |
656 | } | |
657 | EXPORT_SYMBOL_GPL(pinctrl_enable); | |
658 | ||
659 | /** | |
660 | * pinctrl_disable() - disable a certain pin control setting | |
661 | * @p: the pin control handle to disable, previously claimed by pinctrl_get() | |
662 | */ | |
663 | void pinctrl_disable(struct pinctrl *p) | |
664 | { | |
665 | if (p == NULL) | |
666 | return; | |
667 | ||
668 | mutex_lock(&p->mutex); | |
669 | if (--p->usecount == 0) { | |
670 | pinmux_disable(p); | |
671 | } | |
672 | mutex_unlock(&p->mutex); | |
673 | } | |
674 | EXPORT_SYMBOL_GPL(pinctrl_disable); | |
675 | ||
676 | /** | |
677 | * pinctrl_register_mappings() - register a set of pin controller mappings | |
13398a4b SW |
678 | * @maps: the pincontrol mappings table to register. This should probably be |
679 | * marked with __initdata so it can be discarded after boot. This | |
680 | * function will perform a shallow copy for the mapping entries. | |
befe5bdf | 681 | * @num_maps: the number of maps in the mapping table |
befe5bdf | 682 | */ |
13398a4b SW |
683 | int pinctrl_register_mappings(struct pinctrl_map const *maps, |
684 | unsigned num_maps) | |
befe5bdf | 685 | { |
befe5bdf | 686 | int i; |
b2b3e66e | 687 | struct pinctrl_maps *maps_node; |
befe5bdf LW |
688 | |
689 | pr_debug("add %d pinmux maps\n", num_maps); | |
690 | ||
691 | /* First sanity check the new mapping */ | |
692 | for (i = 0; i < num_maps; i++) { | |
693 | if (!maps[i].name) { | |
694 | pr_err("failed to register map %d: no map name given\n", | |
695 | i); | |
696 | return -EINVAL; | |
697 | } | |
698 | ||
699 | if (!maps[i].ctrl_dev_name) { | |
700 | pr_err("failed to register map %s (%d): no pin control device given\n", | |
701 | maps[i].name, i); | |
702 | return -EINVAL; | |
703 | } | |
704 | ||
705 | if (!maps[i].function) { | |
706 | pr_err("failed to register map %s (%d): no function ID given\n", | |
707 | maps[i].name, i); | |
708 | return -EINVAL; | |
709 | } | |
710 | ||
711 | if (!maps[i].dev_name) | |
712 | pr_debug("add system map %s function %s with no device\n", | |
713 | maps[i].name, | |
714 | maps[i].function); | |
715 | else | |
716 | pr_debug("register map %s, function %s\n", | |
717 | maps[i].name, | |
718 | maps[i].function); | |
719 | } | |
720 | ||
b2b3e66e SW |
721 | maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL); |
722 | if (!maps_node) { | |
723 | pr_err("failed to alloc struct pinctrl_maps\n"); | |
724 | return -ENOMEM; | |
725 | } | |
befe5bdf | 726 | |
b2b3e66e SW |
727 | maps_node->num_maps = num_maps; |
728 | maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps, GFP_KERNEL); | |
729 | if (!maps_node->maps) { | |
730 | kfree(maps_node); | |
731 | return -ENOMEM; | |
befe5bdf LW |
732 | } |
733 | ||
b2b3e66e SW |
734 | mutex_lock(&pinctrl_maps_mutex); |
735 | list_add_tail(&maps_node->node, &pinctrl_maps); | |
736 | mutex_unlock(&pinctrl_maps_mutex); | |
737 | ||
befe5bdf LW |
738 | return 0; |
739 | } | |
740 | ||
741 | /* Hog a single map entry and add to the hoglist */ | |
742 | static int pinctrl_hog_map(struct pinctrl_dev *pctldev, | |
743 | struct pinctrl_map const *map) | |
744 | { | |
745 | struct pinctrl_hog *hog; | |
746 | struct pinctrl *p; | |
747 | int ret; | |
748 | ||
befe5bdf LW |
749 | hog = kzalloc(sizeof(struct pinctrl_hog), GFP_KERNEL); |
750 | if (!hog) | |
751 | return -ENOMEM; | |
752 | ||
b2b3e66e | 753 | p = pinctrl_get_locked(pctldev->dev, map->name); |
befe5bdf LW |
754 | if (IS_ERR(p)) { |
755 | kfree(hog); | |
756 | dev_err(pctldev->dev, | |
757 | "could not get the %s pin control mapping for hogging\n", | |
758 | map->name); | |
759 | return PTR_ERR(p); | |
760 | } | |
761 | ||
762 | ret = pinctrl_enable(p); | |
763 | if (ret) { | |
764 | pinctrl_put(p); | |
765 | kfree(hog); | |
766 | dev_err(pctldev->dev, | |
767 | "could not enable the %s pin control mapping for hogging\n", | |
768 | map->name); | |
769 | return ret; | |
770 | } | |
771 | ||
772 | hog->map = map; | |
773 | hog->p = p; | |
774 | ||
775 | dev_info(pctldev->dev, "hogged map %s, function %s\n", map->name, | |
776 | map->function); | |
777 | mutex_lock(&pctldev->pinctrl_hogs_lock); | |
8b9c139f | 778 | list_add_tail(&hog->node, &pctldev->pinctrl_hogs); |
befe5bdf LW |
779 | mutex_unlock(&pctldev->pinctrl_hogs_lock); |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
784 | /** | |
785 | * pinctrl_hog_maps() - hog specific map entries on controller device | |
786 | * @pctldev: the pin control device to hog entries on | |
787 | * | |
788 | * When the pin controllers are registered, there may be some specific pinmux | |
789 | * map entries that need to be hogged, i.e. get+enabled until the system shuts | |
790 | * down. | |
791 | */ | |
4ecce45d | 792 | static int pinctrl_hog_maps(struct pinctrl_dev *pctldev) |
befe5bdf LW |
793 | { |
794 | struct device *dev = pctldev->dev; | |
795 | const char *devname = dev_name(dev); | |
796 | int ret; | |
b2b3e66e | 797 | struct pinctrl_maps *maps_node; |
befe5bdf | 798 | int i; |
b2b3e66e | 799 | struct pinctrl_map const *map; |
befe5bdf LW |
800 | |
801 | INIT_LIST_HEAD(&pctldev->pinctrl_hogs); | |
802 | mutex_init(&pctldev->pinctrl_hogs_lock); | |
803 | ||
b2b3e66e SW |
804 | mutex_lock(&pinctrl_maps_mutex); |
805 | for_each_maps(maps_node, i, map) { | |
9891d98c | 806 | if (!strcmp(map->ctrl_dev_name, devname) && |
77a59883 | 807 | !strcmp(map->dev_name, devname)) { |
befe5bdf LW |
808 | /* OK time to hog! */ |
809 | ret = pinctrl_hog_map(pctldev, map); | |
b2b3e66e SW |
810 | if (ret) { |
811 | mutex_unlock(&pinctrl_maps_mutex); | |
befe5bdf | 812 | return ret; |
b2b3e66e | 813 | } |
befe5bdf LW |
814 | } |
815 | } | |
b2b3e66e SW |
816 | mutex_unlock(&pinctrl_maps_mutex); |
817 | ||
befe5bdf LW |
818 | return 0; |
819 | } | |
820 | ||
821 | /** | |
822 | * pinctrl_unhog_maps() - unhog specific map entries on controller device | |
823 | * @pctldev: the pin control device to unhog entries on | |
824 | */ | |
4ecce45d | 825 | static void pinctrl_unhog_maps(struct pinctrl_dev *pctldev) |
befe5bdf LW |
826 | { |
827 | struct list_head *node, *tmp; | |
828 | ||
829 | mutex_lock(&pctldev->pinctrl_hogs_lock); | |
830 | list_for_each_safe(node, tmp, &pctldev->pinctrl_hogs) { | |
831 | struct pinctrl_hog *hog = | |
832 | list_entry(node, struct pinctrl_hog, node); | |
833 | pinctrl_disable(hog->p); | |
834 | pinctrl_put(hog->p); | |
835 | list_del(node); | |
836 | kfree(hog); | |
837 | } | |
838 | mutex_unlock(&pctldev->pinctrl_hogs_lock); | |
839 | } | |
840 | ||
2744e8af LW |
841 | #ifdef CONFIG_DEBUG_FS |
842 | ||
843 | static int pinctrl_pins_show(struct seq_file *s, void *what) | |
844 | { | |
845 | struct pinctrl_dev *pctldev = s->private; | |
846 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
706e8520 | 847 | unsigned i, pin; |
2744e8af LW |
848 | |
849 | seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); | |
2744e8af | 850 | |
706e8520 CP |
851 | /* The pin number can be retrived from the pin controller descriptor */ |
852 | for (i = 0; i < pctldev->desc->npins; i++) { | |
2744e8af LW |
853 | struct pin_desc *desc; |
854 | ||
706e8520 | 855 | pin = pctldev->desc->pins[i].number; |
2744e8af LW |
856 | desc = pin_desc_get(pctldev, pin); |
857 | /* Pin space may be sparse */ | |
858 | if (desc == NULL) | |
859 | continue; | |
860 | ||
861 | seq_printf(s, "pin %d (%s) ", pin, | |
862 | desc->name ? desc->name : "unnamed"); | |
863 | ||
864 | /* Driver-specific info per pin */ | |
865 | if (ops->pin_dbg_show) | |
866 | ops->pin_dbg_show(pctldev, s, pin); | |
867 | ||
868 | seq_puts(s, "\n"); | |
869 | } | |
870 | ||
871 | return 0; | |
872 | } | |
873 | ||
874 | static int pinctrl_groups_show(struct seq_file *s, void *what) | |
875 | { | |
876 | struct pinctrl_dev *pctldev = s->private; | |
877 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
878 | unsigned selector = 0; | |
879 | ||
880 | /* No grouping */ | |
881 | if (!ops) | |
882 | return 0; | |
883 | ||
884 | seq_puts(s, "registered pin groups:\n"); | |
885 | while (ops->list_groups(pctldev, selector) >= 0) { | |
a5818a8b | 886 | const unsigned *pins; |
2744e8af LW |
887 | unsigned num_pins; |
888 | const char *gname = ops->get_group_name(pctldev, selector); | |
889 | int ret; | |
890 | int i; | |
891 | ||
892 | ret = ops->get_group_pins(pctldev, selector, | |
893 | &pins, &num_pins); | |
894 | if (ret) | |
895 | seq_printf(s, "%s [ERROR GETTING PINS]\n", | |
896 | gname); | |
897 | else { | |
898 | seq_printf(s, "group: %s, pins = [ ", gname); | |
899 | for (i = 0; i < num_pins; i++) | |
900 | seq_printf(s, "%d ", pins[i]); | |
901 | seq_puts(s, "]\n"); | |
902 | } | |
903 | selector++; | |
904 | } | |
905 | ||
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
910 | static int pinctrl_gpioranges_show(struct seq_file *s, void *what) | |
911 | { | |
912 | struct pinctrl_dev *pctldev = s->private; | |
913 | struct pinctrl_gpio_range *range = NULL; | |
914 | ||
915 | seq_puts(s, "GPIO ranges handled:\n"); | |
916 | ||
917 | /* Loop over the ranges */ | |
918 | mutex_lock(&pctldev->gpio_ranges_lock); | |
919 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
75d6642a LW |
920 | seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
921 | range->id, range->name, | |
922 | range->base, (range->base + range->npins - 1), | |
923 | range->pin_base, | |
924 | (range->pin_base + range->npins - 1)); | |
2744e8af LW |
925 | } |
926 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
927 | ||
928 | return 0; | |
929 | } | |
930 | ||
befe5bdf LW |
931 | static int pinctrl_maps_show(struct seq_file *s, void *what) |
932 | { | |
b2b3e66e | 933 | struct pinctrl_maps *maps_node; |
befe5bdf | 934 | int i; |
b2b3e66e | 935 | struct pinctrl_map const *map; |
befe5bdf LW |
936 | |
937 | seq_puts(s, "Pinctrl maps:\n"); | |
938 | ||
b2b3e66e SW |
939 | mutex_lock(&pinctrl_maps_mutex); |
940 | for_each_maps(maps_node, i, map) { | |
befe5bdf LW |
941 | seq_printf(s, "%s:\n", map->name); |
942 | if (map->dev_name) | |
943 | seq_printf(s, " device: %s\n", | |
944 | map->dev_name); | |
945 | else | |
946 | seq_printf(s, " SYSTEM MUX\n"); | |
947 | seq_printf(s, " controlling device %s\n", | |
948 | map->ctrl_dev_name); | |
949 | seq_printf(s, " function: %s\n", map->function); | |
950 | seq_printf(s, " group: %s\n", map->group ? map->group : | |
951 | "(default)"); | |
952 | } | |
b2b3e66e SW |
953 | mutex_unlock(&pinctrl_maps_mutex); |
954 | ||
befe5bdf LW |
955 | return 0; |
956 | } | |
957 | ||
958 | static int pinmux_hogs_show(struct seq_file *s, void *what) | |
959 | { | |
960 | struct pinctrl_dev *pctldev = s->private; | |
961 | struct pinctrl_hog *hog; | |
962 | ||
963 | seq_puts(s, "Pin control map hogs held by device\n"); | |
964 | ||
965 | list_for_each_entry(hog, &pctldev->pinctrl_hogs, node) | |
966 | seq_printf(s, "%s\n", hog->map->name); | |
967 | ||
968 | return 0; | |
969 | } | |
970 | ||
2744e8af LW |
971 | static int pinctrl_devices_show(struct seq_file *s, void *what) |
972 | { | |
973 | struct pinctrl_dev *pctldev; | |
974 | ||
ae6b4d85 | 975 | seq_puts(s, "name [pinmux] [pinconf]\n"); |
2744e8af LW |
976 | mutex_lock(&pinctrldev_list_mutex); |
977 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
978 | seq_printf(s, "%s ", pctldev->desc->name); | |
979 | if (pctldev->desc->pmxops) | |
ae6b4d85 LW |
980 | seq_puts(s, "yes "); |
981 | else | |
982 | seq_puts(s, "no "); | |
983 | if (pctldev->desc->confops) | |
2744e8af LW |
984 | seq_puts(s, "yes"); |
985 | else | |
986 | seq_puts(s, "no"); | |
987 | seq_puts(s, "\n"); | |
988 | } | |
989 | mutex_unlock(&pinctrldev_list_mutex); | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
befe5bdf LW |
994 | static int pinctrl_show(struct seq_file *s, void *what) |
995 | { | |
996 | struct pinctrl *p; | |
997 | ||
998 | seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); | |
999 | list_for_each_entry(p, &pinctrl_list, node) { | |
1000 | struct pinctrl_dev *pctldev = p->pctldev; | |
1001 | ||
1002 | if (!pctldev) { | |
1003 | seq_puts(s, "NO PIN CONTROLLER DEVICE\n"); | |
1004 | continue; | |
1005 | } | |
1006 | ||
1007 | seq_printf(s, "device: %s", | |
1008 | pinctrl_dev_get_name(p->pctldev)); | |
1009 | ||
1010 | pinmux_dbg_show(s, p); | |
1011 | ||
1012 | seq_printf(s, " users: %u map-> %s\n", | |
1013 | p->usecount, | |
1014 | p->dev ? dev_name(p->dev) : "(system)"); | |
1015 | } | |
1016 | ||
1017 | return 0; | |
1018 | } | |
1019 | ||
2744e8af LW |
1020 | static int pinctrl_pins_open(struct inode *inode, struct file *file) |
1021 | { | |
1022 | return single_open(file, pinctrl_pins_show, inode->i_private); | |
1023 | } | |
1024 | ||
1025 | static int pinctrl_groups_open(struct inode *inode, struct file *file) | |
1026 | { | |
1027 | return single_open(file, pinctrl_groups_show, inode->i_private); | |
1028 | } | |
1029 | ||
1030 | static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) | |
1031 | { | |
1032 | return single_open(file, pinctrl_gpioranges_show, inode->i_private); | |
1033 | } | |
1034 | ||
befe5bdf LW |
1035 | static int pinctrl_maps_open(struct inode *inode, struct file *file) |
1036 | { | |
1037 | return single_open(file, pinctrl_maps_show, inode->i_private); | |
1038 | } | |
1039 | ||
1040 | static int pinmux_hogs_open(struct inode *inode, struct file *file) | |
1041 | { | |
1042 | return single_open(file, pinmux_hogs_show, inode->i_private); | |
1043 | } | |
1044 | ||
2744e8af LW |
1045 | static int pinctrl_devices_open(struct inode *inode, struct file *file) |
1046 | { | |
1047 | return single_open(file, pinctrl_devices_show, NULL); | |
1048 | } | |
1049 | ||
befe5bdf LW |
1050 | static int pinctrl_open(struct inode *inode, struct file *file) |
1051 | { | |
1052 | return single_open(file, pinctrl_show, NULL); | |
1053 | } | |
1054 | ||
2744e8af LW |
1055 | static const struct file_operations pinctrl_pins_ops = { |
1056 | .open = pinctrl_pins_open, | |
1057 | .read = seq_read, | |
1058 | .llseek = seq_lseek, | |
1059 | .release = single_release, | |
1060 | }; | |
1061 | ||
1062 | static const struct file_operations pinctrl_groups_ops = { | |
1063 | .open = pinctrl_groups_open, | |
1064 | .read = seq_read, | |
1065 | .llseek = seq_lseek, | |
1066 | .release = single_release, | |
1067 | }; | |
1068 | ||
1069 | static const struct file_operations pinctrl_gpioranges_ops = { | |
1070 | .open = pinctrl_gpioranges_open, | |
1071 | .read = seq_read, | |
1072 | .llseek = seq_lseek, | |
1073 | .release = single_release, | |
1074 | }; | |
1075 | ||
befe5bdf LW |
1076 | static const struct file_operations pinctrl_maps_ops = { |
1077 | .open = pinctrl_maps_open, | |
1078 | .read = seq_read, | |
1079 | .llseek = seq_lseek, | |
1080 | .release = single_release, | |
1081 | }; | |
1082 | ||
1083 | static const struct file_operations pinmux_hogs_ops = { | |
1084 | .open = pinmux_hogs_open, | |
1085 | .read = seq_read, | |
1086 | .llseek = seq_lseek, | |
1087 | .release = single_release, | |
1088 | }; | |
1089 | ||
2744e8af LW |
1090 | static const struct file_operations pinctrl_devices_ops = { |
1091 | .open = pinctrl_devices_open, | |
1092 | .read = seq_read, | |
1093 | .llseek = seq_lseek, | |
1094 | .release = single_release, | |
1095 | }; | |
1096 | ||
befe5bdf LW |
1097 | static const struct file_operations pinctrl_ops = { |
1098 | .open = pinctrl_open, | |
1099 | .read = seq_read, | |
1100 | .llseek = seq_lseek, | |
1101 | .release = single_release, | |
1102 | }; | |
1103 | ||
2744e8af LW |
1104 | static struct dentry *debugfs_root; |
1105 | ||
1106 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
1107 | { | |
02157160 | 1108 | struct dentry *device_root; |
2744e8af | 1109 | |
51cd24ee | 1110 | device_root = debugfs_create_dir(dev_name(pctldev->dev), |
2744e8af | 1111 | debugfs_root); |
02157160 TL |
1112 | pctldev->device_root = device_root; |
1113 | ||
2744e8af LW |
1114 | if (IS_ERR(device_root) || !device_root) { |
1115 | pr_warn("failed to create debugfs directory for %s\n", | |
51cd24ee | 1116 | dev_name(pctldev->dev)); |
2744e8af LW |
1117 | return; |
1118 | } | |
1119 | debugfs_create_file("pins", S_IFREG | S_IRUGO, | |
1120 | device_root, pctldev, &pinctrl_pins_ops); | |
1121 | debugfs_create_file("pingroups", S_IFREG | S_IRUGO, | |
1122 | device_root, pctldev, &pinctrl_groups_ops); | |
1123 | debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, | |
1124 | device_root, pctldev, &pinctrl_gpioranges_ops); | |
befe5bdf LW |
1125 | debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, |
1126 | device_root, pctldev, &pinctrl_maps_ops); | |
1127 | debugfs_create_file("pinmux-hogs", S_IFREG | S_IRUGO, | |
1128 | device_root, pctldev, &pinmux_hogs_ops); | |
2744e8af | 1129 | pinmux_init_device_debugfs(device_root, pctldev); |
ae6b4d85 | 1130 | pinconf_init_device_debugfs(device_root, pctldev); |
2744e8af LW |
1131 | } |
1132 | ||
02157160 TL |
1133 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1134 | { | |
1135 | debugfs_remove_recursive(pctldev->device_root); | |
1136 | } | |
1137 | ||
2744e8af LW |
1138 | static void pinctrl_init_debugfs(void) |
1139 | { | |
1140 | debugfs_root = debugfs_create_dir("pinctrl", NULL); | |
1141 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
1142 | pr_warn("failed to create debugfs directory\n"); | |
1143 | debugfs_root = NULL; | |
1144 | return; | |
1145 | } | |
1146 | ||
1147 | debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, | |
1148 | debugfs_root, NULL, &pinctrl_devices_ops); | |
befe5bdf LW |
1149 | debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, |
1150 | debugfs_root, NULL, &pinctrl_ops); | |
2744e8af LW |
1151 | } |
1152 | ||
1153 | #else /* CONFIG_DEBUG_FS */ | |
1154 | ||
1155 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
1156 | { | |
1157 | } | |
1158 | ||
1159 | static void pinctrl_init_debugfs(void) | |
1160 | { | |
1161 | } | |
1162 | ||
02157160 TL |
1163 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1164 | { | |
1165 | } | |
1166 | ||
2744e8af LW |
1167 | #endif |
1168 | ||
1169 | /** | |
1170 | * pinctrl_register() - register a pin controller device | |
1171 | * @pctldesc: descriptor for this pin controller | |
1172 | * @dev: parent device for this pin controller | |
1173 | * @driver_data: private pin controller data for this pin controller | |
1174 | */ | |
1175 | struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, | |
1176 | struct device *dev, void *driver_data) | |
1177 | { | |
2744e8af LW |
1178 | struct pinctrl_dev *pctldev; |
1179 | int ret; | |
1180 | ||
1181 | if (pctldesc == NULL) | |
1182 | return NULL; | |
1183 | if (pctldesc->name == NULL) | |
1184 | return NULL; | |
1185 | ||
b9130b77 TL |
1186 | pctldev = kzalloc(sizeof(struct pinctrl_dev), GFP_KERNEL); |
1187 | if (pctldev == NULL) | |
1188 | return NULL; | |
1189 | ||
1190 | /* Initialize pin control device struct */ | |
1191 | pctldev->owner = pctldesc->owner; | |
1192 | pctldev->desc = pctldesc; | |
1193 | pctldev->driver_data = driver_data; | |
1194 | INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); | |
1195 | spin_lock_init(&pctldev->pin_desc_tree_lock); | |
1196 | INIT_LIST_HEAD(&pctldev->gpio_ranges); | |
1197 | mutex_init(&pctldev->gpio_ranges_lock); | |
1198 | pctldev->dev = dev; | |
1199 | ||
2744e8af LW |
1200 | /* If we're implementing pinmuxing, check the ops for sanity */ |
1201 | if (pctldesc->pmxops) { | |
b9130b77 | 1202 | ret = pinmux_check_ops(pctldev); |
2744e8af LW |
1203 | if (ret) { |
1204 | pr_err("%s pinmux ops lacks necessary functions\n", | |
1205 | pctldesc->name); | |
b9130b77 | 1206 | goto out_err; |
2744e8af LW |
1207 | } |
1208 | } | |
1209 | ||
ae6b4d85 LW |
1210 | /* If we're implementing pinconfig, check the ops for sanity */ |
1211 | if (pctldesc->confops) { | |
b9130b77 | 1212 | ret = pinconf_check_ops(pctldev); |
ae6b4d85 LW |
1213 | if (ret) { |
1214 | pr_err("%s pin config ops lacks necessary functions\n", | |
1215 | pctldesc->name); | |
b9130b77 | 1216 | goto out_err; |
ae6b4d85 LW |
1217 | } |
1218 | } | |
1219 | ||
2744e8af LW |
1220 | /* Register all the pins */ |
1221 | pr_debug("try to register %d pins on %s...\n", | |
1222 | pctldesc->npins, pctldesc->name); | |
1223 | ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); | |
1224 | if (ret) { | |
1225 | pr_err("error during pin registration\n"); | |
1226 | pinctrl_free_pindescs(pctldev, pctldesc->pins, | |
1227 | pctldesc->npins); | |
51cd24ee | 1228 | goto out_err; |
2744e8af LW |
1229 | } |
1230 | ||
1231 | pinctrl_init_device_debugfs(pctldev); | |
1232 | mutex_lock(&pinctrldev_list_mutex); | |
8b9c139f | 1233 | list_add_tail(&pctldev->node, &pinctrldev_list); |
2744e8af | 1234 | mutex_unlock(&pinctrldev_list_mutex); |
e93bcee0 | 1235 | pinctrl_hog_maps(pctldev); |
2744e8af LW |
1236 | return pctldev; |
1237 | ||
51cd24ee SW |
1238 | out_err: |
1239 | kfree(pctldev); | |
2744e8af LW |
1240 | return NULL; |
1241 | } | |
1242 | EXPORT_SYMBOL_GPL(pinctrl_register); | |
1243 | ||
1244 | /** | |
1245 | * pinctrl_unregister() - unregister pinmux | |
1246 | * @pctldev: pin controller to unregister | |
1247 | * | |
1248 | * Called by pinmux drivers to unregister a pinmux. | |
1249 | */ | |
1250 | void pinctrl_unregister(struct pinctrl_dev *pctldev) | |
1251 | { | |
1252 | if (pctldev == NULL) | |
1253 | return; | |
1254 | ||
02157160 | 1255 | pinctrl_remove_device_debugfs(pctldev); |
e93bcee0 | 1256 | pinctrl_unhog_maps(pctldev); |
2744e8af LW |
1257 | /* TODO: check that no pinmuxes are still active? */ |
1258 | mutex_lock(&pinctrldev_list_mutex); | |
1259 | list_del(&pctldev->node); | |
1260 | mutex_unlock(&pinctrldev_list_mutex); | |
1261 | /* Destroy descriptor tree */ | |
1262 | pinctrl_free_pindescs(pctldev, pctldev->desc->pins, | |
1263 | pctldev->desc->npins); | |
51cd24ee | 1264 | kfree(pctldev); |
2744e8af LW |
1265 | } |
1266 | EXPORT_SYMBOL_GPL(pinctrl_unregister); | |
1267 | ||
1268 | static int __init pinctrl_init(void) | |
1269 | { | |
1270 | pr_info("initialized pinctrl subsystem\n"); | |
1271 | pinctrl_init_debugfs(); | |
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | /* init early since many drivers really need to initialized pinmux early */ | |
1276 | core_initcall(pinctrl_init); |