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1 | /* |
2 | * Core driver for the pin control subsystem |
3 | * |
4 | * Copyright (C) 2011-2012 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 | * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. |
11 | * |
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> |
17 | #include <linux/kref.h> |
18 | #include <linux/export.h> |
19 | #include <linux/init.h> |
20 | #include <linux/device.h> |
21 | #include <linux/slab.h> |
22 | #include <linux/err.h> |
23 | #include <linux/list.h> |
24 | #include <linux/sysfs.h> |
25 | #include <linux/debugfs.h> |
26 | #include <linux/seq_file.h> |
27 | #include <linux/pinctrl/consumer.h> |
28 | #include <linux/pinctrl/pinctrl.h> |
29 | #include <linux/pinctrl/machine.h> |
30 | #include "core.h" |
31 | #include "devicetree.h" |
32 | #include "pinmux.h" |
33 | #include "pinconf.h" |
34 | |
35 | |
36 | static bool pinctrl_dummy_state; |
37 | |
38 | /* Mutex taken by all entry points */ |
39 | DEFINE_MUTEX(pinctrl_mutex); |
40 | |
41 | /* Global list of pin control devices (struct pinctrl_dev) */ |
42 | LIST_HEAD(pinctrldev_list); |
43 | |
44 | /* List of pin controller handles (struct pinctrl) */ |
45 | static LIST_HEAD(pinctrl_list); |
46 | |
47 | /* List of pinctrl maps (struct pinctrl_maps) */ |
48 | LIST_HEAD(pinctrl_maps); |
49 | |
50 | |
51 | /** |
52 | * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support |
53 | * |
54 | * Usually this function is called by platforms without pinctrl driver support |
55 | * but run with some shared drivers using pinctrl APIs. |
56 | * After calling this function, the pinctrl core will return successfully |
57 | * with creating a dummy state for the driver to keep going smoothly. |
58 | */ |
59 | void pinctrl_provide_dummies(void) |
60 | { |
61 | pinctrl_dummy_state = true; |
62 | } |
63 | |
64 | const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) |
65 | { |
66 | /* We're not allowed to register devices without name */ |
67 | return pctldev->desc->name; |
68 | } |
69 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); |
70 | |
71 | const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev) |
72 | { |
73 | return dev_name(pctldev->dev); |
74 | } |
75 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname); |
76 | |
77 | void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) |
78 | { |
79 | return pctldev->driver_data; |
80 | } |
81 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); |
82 | |
83 | /** |
84 | * get_pinctrl_dev_from_devname() - look up pin controller device |
85 | * @devname: the name of a device instance, as returned by dev_name() |
86 | * |
87 | * Looks up a pin control device matching a certain device name or pure device |
88 | * pointer, the pure device pointer will take precedence. |
89 | */ |
90 | struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname) |
91 | { |
92 | struct pinctrl_dev *pctldev = NULL; |
93 | bool found = false; |
94 | |
95 | if (!devname) |
96 | return NULL; |
97 | |
98 | list_for_each_entry(pctldev, &pinctrldev_list, node) { |
99 | if (!strcmp(dev_name(pctldev->dev), devname)) { |
100 | /* Matched on device name */ |
101 | found = true; |
102 | break; |
103 | } |
104 | } |
105 | |
106 | return found ? pctldev : NULL; |
107 | } |
108 | |
109 | /** |
110 | * pin_get_from_name() - look up a pin number from a name |
111 | * @pctldev: the pin control device to lookup the pin on |
112 | * @name: the name of the pin to look up |
113 | */ |
114 | int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) |
115 | { |
116 | unsigned i, pin; |
117 | |
118 | /* The pin number can be retrived from the pin controller descriptor */ |
119 | for (i = 0; i < pctldev->desc->npins; i++) { |
120 | struct pin_desc *desc; |
121 | |
122 | pin = pctldev->desc->pins[i].number; |
123 | desc = pin_desc_get(pctldev, pin); |
124 | /* Pin space may be sparse */ |
125 | if (desc == NULL) |
126 | continue; |
127 | if (desc->name && !strcmp(name, desc->name)) |
128 | return pin; |
129 | } |
130 | |
131 | return -EINVAL; |
132 | } |
133 | |
134 | /** |
135 | * pin_get_name_from_id() - look up a pin name from a pin id |
136 | * @pctldev: the pin control device to lookup the pin on |
137 | * @name: the name of the pin to look up |
138 | */ |
139 | const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin) |
140 | { |
141 | const struct pin_desc *desc; |
142 | |
143 | desc = pin_desc_get(pctldev, pin); |
144 | if (desc == NULL) { |
145 | dev_err(pctldev->dev, "failed to get pin(%d) name\n", |
146 | pin); |
147 | return NULL; |
148 | } |
149 | |
150 | return desc->name; |
151 | } |
152 | |
153 | /** |
154 | * pin_is_valid() - check if pin exists on controller |
155 | * @pctldev: the pin control device to check the pin on |
156 | * @pin: pin to check, use the local pin controller index number |
157 | * |
158 | * This tells us whether a certain pin exist on a certain pin controller or |
159 | * not. Pin lists may be sparse, so some pins may not exist. |
160 | */ |
161 | bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) |
162 | { |
163 | struct pin_desc *pindesc; |
164 | |
165 | if (pin < 0) |
166 | return false; |
167 | |
168 | mutex_lock(&pinctrl_mutex); |
169 | pindesc = pin_desc_get(pctldev, pin); |
170 | mutex_unlock(&pinctrl_mutex); |
171 | |
172 | return pindesc != NULL; |
173 | } |
174 | EXPORT_SYMBOL_GPL(pin_is_valid); |
175 | |
176 | /* Deletes a range of pin descriptors */ |
177 | static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, |
178 | const struct pinctrl_pin_desc *pins, |
179 | unsigned num_pins) |
180 | { |
181 | int i; |
182 | |
183 | for (i = 0; i < num_pins; i++) { |
184 | struct pin_desc *pindesc; |
185 | |
186 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, |
187 | pins[i].number); |
188 | if (pindesc != NULL) { |
189 | radix_tree_delete(&pctldev->pin_desc_tree, |
190 | pins[i].number); |
191 | if (pindesc->dynamic_name) |
192 | kfree(pindesc->name); |
193 | } |
194 | kfree(pindesc); |
195 | } |
196 | } |
197 | |
198 | static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, |
199 | unsigned number, const char *name) |
200 | { |
201 | struct pin_desc *pindesc; |
202 | |
203 | pindesc = pin_desc_get(pctldev, number); |
204 | if (pindesc != NULL) { |
205 | pr_err("pin %d already registered on %s\n", number, |
206 | pctldev->desc->name); |
207 | return -EINVAL; |
208 | } |
209 | |
210 | pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); |
211 | if (pindesc == NULL) { |
212 | dev_err(pctldev->dev, "failed to alloc struct pin_desc\n"); |
213 | return -ENOMEM; |
214 | } |
215 | |
216 | /* Set owner */ |
217 | pindesc->pctldev = pctldev; |
218 | |
219 | /* Copy basic pin info */ |
220 | if (name) { |
221 | pindesc->name = name; |
222 | } else { |
223 | pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number); |
224 | if (pindesc->name == NULL) { |
225 | kfree(pindesc); |
226 | return -ENOMEM; |
227 | } |
228 | pindesc->dynamic_name = true; |
229 | } |
230 | |
231 | radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); |
232 | pr_debug("registered pin %d (%s) on %s\n", |
233 | number, pindesc->name, pctldev->desc->name); |
234 | return 0; |
235 | } |
236 | |
237 | static int pinctrl_register_pins(struct pinctrl_dev *pctldev, |
238 | struct pinctrl_pin_desc const *pins, |
239 | unsigned num_descs) |
240 | { |
241 | unsigned i; |
242 | int ret = 0; |
243 | |
244 | for (i = 0; i < num_descs; i++) { |
245 | ret = pinctrl_register_one_pin(pctldev, |
246 | pins[i].number, pins[i].name); |
247 | if (ret) |
248 | return ret; |
249 | } |
250 | |
251 | return 0; |
252 | } |
253 | |
254 | /** |
255 | * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range |
256 | * @pctldev: pin controller device to check |
257 | * @gpio: gpio pin to check taken from the global GPIO pin space |
258 | * |
259 | * Tries to match a GPIO pin number to the ranges handled by a certain pin |
260 | * controller, return the range or NULL |
261 | */ |
262 | static struct pinctrl_gpio_range * |
263 | pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) |
264 | { |
265 | struct pinctrl_gpio_range *range = NULL; |
266 | |
267 | /* Loop over the ranges */ |
268 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
269 | /* Check if we're in the valid range */ |
270 | if (gpio >= range->base && |
271 | gpio < range->base + range->npins) { |
272 | return range; |
273 | } |
274 | } |
275 | |
276 | return NULL; |
277 | } |
278 | |
279 | /** |
280 | * pinctrl_get_device_gpio_range() - find device for GPIO range |
281 | * @gpio: the pin to locate the pin controller for |
282 | * @outdev: the pin control device if found |
283 | * @outrange: the GPIO range if found |
284 | * |
285 | * Find the pin controller handling a certain GPIO pin from the pinspace of |
286 | * the GPIO subsystem, return the device and the matching GPIO range. Returns |
287 | * -EPROBE_DEFER if the GPIO range could not be found in any device since it |
288 | * may still have not been registered. |
289 | */ |
290 | static int pinctrl_get_device_gpio_range(unsigned gpio, |
291 | struct pinctrl_dev **outdev, |
292 | struct pinctrl_gpio_range **outrange) |
293 | { |
294 | struct pinctrl_dev *pctldev = NULL; |
295 | |
296 | /* Loop over the pin controllers */ |
297 | list_for_each_entry(pctldev, &pinctrldev_list, node) { |
298 | struct pinctrl_gpio_range *range; |
299 | |
300 | range = pinctrl_match_gpio_range(pctldev, gpio); |
301 | if (range != NULL) { |
302 | *outdev = pctldev; |
303 | *outrange = range; |
304 | return 0; |
305 | } |
306 | } |
307 | |
308 | return -EPROBE_DEFER; |
309 | } |
310 | |
311 | /** |
312 | * pinctrl_add_gpio_range() - register a GPIO range for a controller |
313 | * @pctldev: pin controller device to add the range to |
314 | * @range: the GPIO range to add |
315 | * |
316 | * This adds a range of GPIOs to be handled by a certain pin controller. Call |
317 | * this to register handled ranges after registering your pin controller. |
318 | */ |
319 | void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, |
320 | struct pinctrl_gpio_range *range) |
321 | { |
322 | mutex_lock(&pinctrl_mutex); |
323 | list_add_tail(&range->node, &pctldev->gpio_ranges); |
324 | mutex_unlock(&pinctrl_mutex); |
325 | } |
326 | EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range); |
327 | |
328 | void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev, |
329 | struct pinctrl_gpio_range *ranges, |
330 | unsigned nranges) |
331 | { |
332 | int i; |
333 | |
334 | for (i = 0; i < nranges; i++) |
335 | pinctrl_add_gpio_range(pctldev, &ranges[i]); |
336 | } |
337 | EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges); |
338 | |
339 | struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, |
340 | struct pinctrl_gpio_range *range) |
341 | { |
342 | struct pinctrl_dev *pctldev = get_pinctrl_dev_from_devname(devname); |
343 | |
344 | /* |
345 | * If we can't find this device, let's assume that is because |
346 | * it has not probed yet, so the driver trying to register this |
347 | * range need to defer probing. |
348 | */ |
349 | if (!pctldev) |
350 | return ERR_PTR(-EPROBE_DEFER); |
351 | |
352 | pinctrl_add_gpio_range(pctldev, range); |
353 | return pctldev; |
354 | } |
355 | EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range); |
356 | |
357 | /** |
358 | * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin |
359 | * @pctldev: the pin controller device to look in |
360 | * @pin: a controller-local number to find the range for |
361 | */ |
362 | struct pinctrl_gpio_range * |
363 | pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, |
364 | unsigned int pin) |
365 | { |
366 | struct pinctrl_gpio_range *range = NULL; |
367 | |
368 | /* Loop over the ranges */ |
369 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
370 | /* Check if we're in the valid range */ |
371 | if (pin >= range->pin_base && |
372 | pin < range->pin_base + range->npins) { |
373 | return range; |
374 | } |
375 | } |
376 | |
377 | return NULL; |
378 | } |
379 | EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin); |
380 | |
381 | /** |
382 | * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller |
383 | * @pctldev: pin controller device to remove the range from |
384 | * @range: the GPIO range to remove |
385 | */ |
386 | void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, |
387 | struct pinctrl_gpio_range *range) |
388 | { |
389 | mutex_lock(&pinctrl_mutex); |
390 | list_del(&range->node); |
391 | mutex_unlock(&pinctrl_mutex); |
392 | } |
393 | EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range); |
394 | |
395 | /** |
396 | * pinctrl_get_group_selector() - returns the group selector for a group |
397 | * @pctldev: the pin controller handling the group |
398 | * @pin_group: the pin group to look up |
399 | */ |
400 | int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, |
401 | const char *pin_group) |
402 | { |
403 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
404 | unsigned ngroups = pctlops->get_groups_count(pctldev); |
405 | unsigned group_selector = 0; |
406 | |
407 | while (group_selector < ngroups) { |
408 | const char *gname = pctlops->get_group_name(pctldev, |
409 | group_selector); |
410 | if (!strcmp(gname, pin_group)) { |
411 | dev_dbg(pctldev->dev, |
412 | "found group selector %u for %s\n", |
413 | group_selector, |
414 | pin_group); |
415 | return group_selector; |
416 | } |
417 | |
418 | group_selector++; |
419 | } |
420 | |
421 | dev_err(pctldev->dev, "does not have pin group %s\n", |
422 | pin_group); |
423 | |
424 | return -EINVAL; |
425 | } |
426 | |
427 | /** |
428 | * pinctrl_request_gpio() - request a single pin to be used in as GPIO |
429 | * @gpio: the GPIO pin number from the GPIO subsystem number space |
430 | * |
431 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, |
432 | * as part of their gpio_request() semantics, platforms and individual drivers |
433 | * shall *NOT* request GPIO pins to be muxed in. |
434 | */ |
435 | int pinctrl_request_gpio(unsigned gpio) |
436 | { |
437 | struct pinctrl_dev *pctldev; |
438 | struct pinctrl_gpio_range *range; |
439 | int ret; |
440 | int pin; |
441 | |
442 | mutex_lock(&pinctrl_mutex); |
443 | |
444 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
445 | if (ret) { |
446 | mutex_unlock(&pinctrl_mutex); |
447 | return ret; |
448 | } |
449 | |
450 | /* Convert to the pin controllers number space */ |
451 | pin = gpio - range->base + range->pin_base; |
452 | |
453 | ret = pinmux_request_gpio(pctldev, range, pin, gpio); |
454 | |
455 | mutex_unlock(&pinctrl_mutex); |
456 | return ret; |
457 | } |
458 | EXPORT_SYMBOL_GPL(pinctrl_request_gpio); |
459 | |
460 | /** |
461 | * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO |
462 | * @gpio: the GPIO pin number from the GPIO subsystem number space |
463 | * |
464 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, |
465 | * as part of their gpio_free() semantics, platforms and individual drivers |
466 | * shall *NOT* request GPIO pins to be muxed out. |
467 | */ |
468 | void pinctrl_free_gpio(unsigned gpio) |
469 | { |
470 | struct pinctrl_dev *pctldev; |
471 | struct pinctrl_gpio_range *range; |
472 | int ret; |
473 | int pin; |
474 | |
475 | mutex_lock(&pinctrl_mutex); |
476 | |
477 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
478 | if (ret) { |
479 | mutex_unlock(&pinctrl_mutex); |
480 | return; |
481 | } |
482 | |
483 | /* Convert to the pin controllers number space */ |
484 | pin = gpio - range->base + range->pin_base; |
485 | |
486 | pinmux_free_gpio(pctldev, pin, range); |
487 | |
488 | mutex_unlock(&pinctrl_mutex); |
489 | } |
490 | EXPORT_SYMBOL_GPL(pinctrl_free_gpio); |
491 | |
492 | static int pinctrl_gpio_direction(unsigned gpio, bool input) |
493 | { |
494 | struct pinctrl_dev *pctldev; |
495 | struct pinctrl_gpio_range *range; |
496 | int ret; |
497 | int pin; |
498 | |
499 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
500 | if (ret) |
501 | return ret; |
502 | |
503 | /* Convert to the pin controllers number space */ |
504 | pin = gpio - range->base + range->pin_base; |
505 | |
506 | return pinmux_gpio_direction(pctldev, range, pin, input); |
507 | } |
508 | |
509 | /** |
510 | * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode |
511 | * @gpio: the GPIO pin number from the GPIO subsystem number space |
512 | * |
513 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, |
514 | * as part of their gpio_direction_input() semantics, platforms and individual |
515 | * drivers shall *NOT* touch pin control GPIO calls. |
516 | */ |
517 | int pinctrl_gpio_direction_input(unsigned gpio) |
518 | { |
519 | int ret; |
520 | mutex_lock(&pinctrl_mutex); |
521 | ret = pinctrl_gpio_direction(gpio, true); |
522 | mutex_unlock(&pinctrl_mutex); |
523 | return ret; |
524 | } |
525 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input); |
526 | |
527 | /** |
528 | * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode |
529 | * @gpio: the GPIO pin number from the GPIO subsystem number space |
530 | * |
531 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, |
532 | * as part of their gpio_direction_output() semantics, platforms and individual |
533 | * drivers shall *NOT* touch pin control GPIO calls. |
534 | */ |
535 | int pinctrl_gpio_direction_output(unsigned gpio) |
536 | { |
537 | int ret; |
538 | mutex_lock(&pinctrl_mutex); |
539 | ret = pinctrl_gpio_direction(gpio, false); |
540 | mutex_unlock(&pinctrl_mutex); |
541 | return ret; |
542 | } |
543 | EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); |
544 | |
545 | static struct pinctrl_state *find_state(struct pinctrl *p, |
546 | const char *name) |
547 | { |
548 | struct pinctrl_state *state; |
549 | |
550 | list_for_each_entry(state, &p->states, node) |
551 | if (!strcmp(state->name, name)) |
552 | return state; |
553 | |
554 | return NULL; |
555 | } |
556 | |
557 | static struct pinctrl_state *create_state(struct pinctrl *p, |
558 | const char *name) |
559 | { |
560 | struct pinctrl_state *state; |
561 | |
562 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
563 | if (state == NULL) { |
564 | dev_err(p->dev, |
565 | "failed to alloc struct pinctrl_state\n"); |
566 | return ERR_PTR(-ENOMEM); |
567 | } |
568 | |
569 | state->name = name; |
570 | INIT_LIST_HEAD(&state->settings); |
571 | |
572 | list_add_tail(&state->node, &p->states); |
573 | |
574 | return state; |
575 | } |
576 | |
577 | static int add_setting(struct pinctrl *p, struct pinctrl_map const *map) |
578 | { |
579 | struct pinctrl_state *state; |
580 | struct pinctrl_setting *setting; |
581 | int ret; |
582 | |
583 | state = find_state(p, map->name); |
584 | if (!state) |
585 | state = create_state(p, map->name); |
586 | if (IS_ERR(state)) |
587 | return PTR_ERR(state); |
588 | |
589 | if (map->type == PIN_MAP_TYPE_DUMMY_STATE) |
590 | return 0; |
591 | |
592 | setting = kzalloc(sizeof(*setting), GFP_KERNEL); |
593 | if (setting == NULL) { |
594 | dev_err(p->dev, |
595 | "failed to alloc struct pinctrl_setting\n"); |
596 | return -ENOMEM; |
597 | } |
598 | |
599 | setting->type = map->type; |
600 | |
601 | setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name); |
602 | if (setting->pctldev == NULL) { |
603 | kfree(setting); |
604 | /* Do not defer probing of hogs (circular loop) */ |
605 | if (!strcmp(map->ctrl_dev_name, map->dev_name)) |
606 | return -ENODEV; |
607 | /* |
608 | * OK let us guess that the driver is not there yet, and |
609 | * let's defer obtaining this pinctrl handle to later... |
610 | */ |
611 | dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe", |
612 | map->ctrl_dev_name); |
613 | return -EPROBE_DEFER; |
614 | } |
615 | |
616 | setting->dev_name = map->dev_name; |
617 | |
618 | switch (map->type) { |
619 | case PIN_MAP_TYPE_MUX_GROUP: |
620 | ret = pinmux_map_to_setting(map, setting); |
621 | break; |
622 | case PIN_MAP_TYPE_CONFIGS_PIN: |
623 | case PIN_MAP_TYPE_CONFIGS_GROUP: |
624 | ret = pinconf_map_to_setting(map, setting); |
625 | break; |
626 | default: |
627 | ret = -EINVAL; |
628 | break; |
629 | } |
630 | if (ret < 0) { |
631 | kfree(setting); |
632 | return ret; |
633 | } |
634 | |
635 | list_add_tail(&setting->node, &state->settings); |
636 | |
637 | return 0; |
638 | } |
639 | |
640 | static struct pinctrl *find_pinctrl(struct device *dev) |
641 | { |
642 | struct pinctrl *p; |
643 | |
644 | list_for_each_entry(p, &pinctrl_list, node) |
645 | if (p->dev == dev) |
646 | return p; |
647 | |
648 | return NULL; |
649 | } |
650 | |
651 | static void pinctrl_put_locked(struct pinctrl *p, bool inlist); |
652 | |
653 | static struct pinctrl *create_pinctrl(struct device *dev) |
654 | { |
655 | struct pinctrl *p; |
656 | const char *devname; |
657 | struct pinctrl_maps *maps_node; |
658 | int i; |
659 | struct pinctrl_map const *map; |
660 | int ret; |
661 | |
662 | /* |
663 | * create the state cookie holder struct pinctrl for each |
664 | * mapping, this is what consumers will get when requesting |
665 | * a pin control handle with pinctrl_get() |
666 | */ |
667 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
668 | if (p == NULL) { |
669 | dev_err(dev, "failed to alloc struct pinctrl\n"); |
670 | return ERR_PTR(-ENOMEM); |
671 | } |
672 | p->dev = dev; |
673 | INIT_LIST_HEAD(&p->states); |
674 | INIT_LIST_HEAD(&p->dt_maps); |
675 | |
676 | ret = pinctrl_dt_to_map(p); |
677 | if (ret < 0) { |
678 | kfree(p); |
679 | return ERR_PTR(ret); |
680 | } |
681 | |
682 | devname = dev_name(dev); |
683 | |
684 | /* Iterate over the pin control maps to locate the right ones */ |
685 | for_each_maps(maps_node, i, map) { |
686 | /* Map must be for this device */ |
687 | if (strcmp(map->dev_name, devname)) |
688 | continue; |
689 | |
690 | ret = add_setting(p, map); |
691 | /* |
692 | * At this point the adding of a setting may: |
693 | * |
694 | * - Defer, if the pinctrl device is not yet available |
695 | * - Fail, if the pinctrl device is not yet available, |
696 | * AND the setting is a hog. We cannot defer that, since |
697 | * the hog will kick in immediately after the device |
698 | * is registered. |
699 | * |
700 | * If the error returned was not -EPROBE_DEFER then we |
701 | * accumulate the errors to see if we end up with |
702 | * an -EPROBE_DEFER later, as that is the worst case. |
703 | */ |
704 | if (ret == -EPROBE_DEFER) { |
705 | pinctrl_put_locked(p, false); |
706 | return ERR_PTR(ret); |
707 | } |
708 | } |
709 | if (ret < 0) { |
710 | /* If some other error than deferral occured, return here */ |
711 | pinctrl_put_locked(p, false); |
712 | return ERR_PTR(ret); |
713 | } |
714 | |
715 | kref_init(&p->users); |
716 | |
717 | /* Add the pinctrl handle to the global list */ |
718 | list_add_tail(&p->node, &pinctrl_list); |
719 | |
720 | return p; |
721 | } |
722 | |
723 | static struct pinctrl *pinctrl_get_locked(struct device *dev) |
724 | { |
725 | struct pinctrl *p; |
726 | |
727 | if (WARN_ON(!dev)) |
728 | return ERR_PTR(-EINVAL); |
729 | |
730 | /* |
731 | * See if somebody else (such as the device core) has already |
732 | * obtained a handle to the pinctrl for this device. In that case, |
733 | * return another pointer to it. |
734 | */ |
735 | p = find_pinctrl(dev); |
736 | if (p != NULL) { |
737 | dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n"); |
738 | kref_get(&p->users); |
739 | return p; |
740 | } |
741 | |
742 | return create_pinctrl(dev); |
743 | } |
744 | |
745 | /** |
746 | * pinctrl_get() - retrieves the pinctrl handle for a device |
747 | * @dev: the device to obtain the handle for |
748 | */ |
749 | struct pinctrl *pinctrl_get(struct device *dev) |
750 | { |
751 | struct pinctrl *p; |
752 | |
753 | mutex_lock(&pinctrl_mutex); |
754 | p = pinctrl_get_locked(dev); |
755 | mutex_unlock(&pinctrl_mutex); |
756 | |
757 | return p; |
758 | } |
759 | EXPORT_SYMBOL_GPL(pinctrl_get); |
760 | |
761 | static void pinctrl_put_locked(struct pinctrl *p, bool inlist) |
762 | { |
763 | struct pinctrl_state *state, *n1; |
764 | struct pinctrl_setting *setting, *n2; |
765 | |
766 | list_for_each_entry_safe(state, n1, &p->states, node) { |
767 | list_for_each_entry_safe(setting, n2, &state->settings, node) { |
768 | switch (setting->type) { |
769 | case PIN_MAP_TYPE_MUX_GROUP: |
770 | if (state == p->state) |
771 | pinmux_disable_setting(setting); |
772 | pinmux_free_setting(setting); |
773 | break; |
774 | case PIN_MAP_TYPE_CONFIGS_PIN: |
775 | case PIN_MAP_TYPE_CONFIGS_GROUP: |
776 | pinconf_free_setting(setting); |
777 | break; |
778 | default: |
779 | break; |
780 | } |
781 | list_del(&setting->node); |
782 | kfree(setting); |
783 | } |
784 | list_del(&state->node); |
785 | kfree(state); |
786 | } |
787 | |
788 | pinctrl_dt_free_maps(p); |
789 | |
790 | if (inlist) |
791 | list_del(&p->node); |
792 | kfree(p); |
793 | } |
794 | |
795 | /** |
796 | * pinctrl_release() - release the pinctrl handle |
797 | * @kref: the kref in the pinctrl being released |
798 | */ |
799 | static void pinctrl_release(struct kref *kref) |
800 | { |
801 | struct pinctrl *p = container_of(kref, struct pinctrl, users); |
802 | |
803 | pinctrl_put_locked(p, true); |
804 | } |
805 | |
806 | /** |
807 | * pinctrl_put() - decrease use count on a previously claimed pinctrl handle |
808 | * @p: the pinctrl handle to release |
809 | */ |
810 | void pinctrl_put(struct pinctrl *p) |
811 | { |
812 | mutex_lock(&pinctrl_mutex); |
813 | kref_put(&p->users, pinctrl_release); |
814 | mutex_unlock(&pinctrl_mutex); |
815 | } |
816 | EXPORT_SYMBOL_GPL(pinctrl_put); |
817 | |
818 | static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p, |
819 | const char *name) |
820 | { |
821 | struct pinctrl_state *state; |
822 | |
823 | state = find_state(p, name); |
824 | if (!state) { |
825 | if (pinctrl_dummy_state) { |
826 | /* create dummy state */ |
827 | dev_dbg(p->dev, "using pinctrl dummy state (%s)\n", |
828 | name); |
829 | state = create_state(p, name); |
830 | } else |
831 | state = ERR_PTR(-ENODEV); |
832 | } |
833 | |
834 | return state; |
835 | } |
836 | |
837 | /** |
838 | * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle |
839 | * @p: the pinctrl handle to retrieve the state from |
840 | * @name: the state name to retrieve |
841 | */ |
842 | struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name) |
843 | { |
844 | struct pinctrl_state *s; |
845 | |
846 | mutex_lock(&pinctrl_mutex); |
847 | s = pinctrl_lookup_state_locked(p, name); |
848 | mutex_unlock(&pinctrl_mutex); |
849 | |
850 | return s; |
851 | } |
852 | EXPORT_SYMBOL_GPL(pinctrl_lookup_state); |
853 | |
854 | static int pinctrl_select_state_locked(struct pinctrl *p, |
855 | struct pinctrl_state *state) |
856 | { |
857 | struct pinctrl_setting *setting, *setting2; |
858 | int ret; |
859 | |
860 | if (p->state == state) |
861 | return 0; |
862 | |
863 | if (p->state) { |
864 | /* |
865 | * The set of groups with a mux configuration in the old state |
866 | * may not be identical to the set of groups with a mux setting |
867 | * in the new state. While this might be unusual, it's entirely |
868 | * possible for the "user"-supplied mapping table to be written |
869 | * that way. For each group that was configured in the old state |
870 | * but not in the new state, this code puts that group into a |
871 | * safe/disabled state. |
872 | */ |
873 | list_for_each_entry(setting, &p->state->settings, node) { |
874 | bool found = false; |
875 | if (setting->type != PIN_MAP_TYPE_MUX_GROUP) |
876 | continue; |
877 | list_for_each_entry(setting2, &state->settings, node) { |
878 | if (setting2->type != PIN_MAP_TYPE_MUX_GROUP) |
879 | continue; |
880 | if (setting2->data.mux.group == |
881 | setting->data.mux.group) { |
882 | found = true; |
883 | break; |
884 | } |
885 | } |
886 | if (!found) |
887 | pinmux_disable_setting(setting); |
888 | } |
889 | } |
890 | |
891 | p->state = state; |
892 | |
893 | /* Apply all the settings for the new state */ |
894 | list_for_each_entry(setting, &state->settings, node) { |
895 | switch (setting->type) { |
896 | case PIN_MAP_TYPE_MUX_GROUP: |
897 | ret = pinmux_enable_setting(setting); |
898 | break; |
899 | case PIN_MAP_TYPE_CONFIGS_PIN: |
900 | case PIN_MAP_TYPE_CONFIGS_GROUP: |
901 | ret = pinconf_apply_setting(setting); |
902 | break; |
903 | default: |
904 | ret = -EINVAL; |
905 | break; |
906 | } |
907 | if (ret < 0) { |
908 | /* FIXME: Difficult to return to prev state */ |
909 | return ret; |
910 | } |
911 | } |
912 | |
913 | return 0; |
914 | } |
915 | |
916 | /** |
917 | * pinctrl_select() - select/activate/program a pinctrl state to HW |
918 | * @p: the pinctrl handle for the device that requests configuratio |
919 | * @state: the state handle to select/activate/program |
920 | */ |
921 | int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) |
922 | { |
923 | int ret; |
924 | |
925 | mutex_lock(&pinctrl_mutex); |
926 | ret = pinctrl_select_state_locked(p, state); |
927 | mutex_unlock(&pinctrl_mutex); |
928 | |
929 | return ret; |
930 | } |
931 | EXPORT_SYMBOL_GPL(pinctrl_select_state); |
932 | |
933 | static void devm_pinctrl_release(struct device *dev, void *res) |
934 | { |
935 | pinctrl_put(*(struct pinctrl **)res); |
936 | } |
937 | |
938 | /** |
939 | * struct devm_pinctrl_get() - Resource managed pinctrl_get() |
940 | * @dev: the device to obtain the handle for |
941 | * |
942 | * If there is a need to explicitly destroy the returned struct pinctrl, |
943 | * devm_pinctrl_put() should be used, rather than plain pinctrl_put(). |
944 | */ |
945 | struct pinctrl *devm_pinctrl_get(struct device *dev) |
946 | { |
947 | struct pinctrl **ptr, *p; |
948 | |
949 | ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL); |
950 | if (!ptr) |
951 | return ERR_PTR(-ENOMEM); |
952 | |
953 | p = pinctrl_get(dev); |
954 | if (!IS_ERR(p)) { |
955 | *ptr = p; |
956 | devres_add(dev, ptr); |
957 | } else { |
958 | devres_free(ptr); |
959 | } |
960 | |
961 | return p; |
962 | } |
963 | EXPORT_SYMBOL_GPL(devm_pinctrl_get); |
964 | |
965 | static int devm_pinctrl_match(struct device *dev, void *res, void *data) |
966 | { |
967 | struct pinctrl **p = res; |
968 | |
969 | return *p == data; |
970 | } |
971 | |
972 | /** |
973 | * devm_pinctrl_put() - Resource managed pinctrl_put() |
974 | * @p: the pinctrl handle to release |
975 | * |
976 | * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally |
977 | * this function will not need to be called and the resource management |
978 | * code will ensure that the resource is freed. |
979 | */ |
980 | void devm_pinctrl_put(struct pinctrl *p) |
981 | { |
982 | WARN_ON(devres_destroy(p->dev, devm_pinctrl_release, |
983 | devm_pinctrl_match, p)); |
984 | pinctrl_put(p); |
985 | } |
986 | EXPORT_SYMBOL_GPL(devm_pinctrl_put); |
987 | |
988 | int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps, |
989 | bool dup, bool locked) |
990 | { |
991 | int i, ret; |
992 | struct pinctrl_maps *maps_node; |
993 | |
994 | pr_debug("add %d pinmux maps\n", num_maps); |
995 | |
996 | /* First sanity check the new mapping */ |
997 | for (i = 0; i < num_maps; i++) { |
998 | if (!maps[i].dev_name) { |
999 | pr_err("failed to register map %s (%d): no device given\n", |
1000 | maps[i].name, i); |
1001 | return -EINVAL; |
1002 | } |
1003 | |
1004 | if (!maps[i].name) { |
1005 | pr_err("failed to register map %d: no map name given\n", |
1006 | i); |
1007 | return -EINVAL; |
1008 | } |
1009 | |
1010 | if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE && |
1011 | !maps[i].ctrl_dev_name) { |
1012 | pr_err("failed to register map %s (%d): no pin control device given\n", |
1013 | maps[i].name, i); |
1014 | return -EINVAL; |
1015 | } |
1016 | |
1017 | switch (maps[i].type) { |
1018 | case PIN_MAP_TYPE_DUMMY_STATE: |
1019 | break; |
1020 | case PIN_MAP_TYPE_MUX_GROUP: |
1021 | ret = pinmux_validate_map(&maps[i], i); |
1022 | if (ret < 0) |
1023 | return ret; |
1024 | break; |
1025 | case PIN_MAP_TYPE_CONFIGS_PIN: |
1026 | case PIN_MAP_TYPE_CONFIGS_GROUP: |
1027 | ret = pinconf_validate_map(&maps[i], i); |
1028 | if (ret < 0) |
1029 | return ret; |
1030 | break; |
1031 | default: |
1032 | pr_err("failed to register map %s (%d): invalid type given\n", |
1033 | maps[i].name, i); |
1034 | return -EINVAL; |
1035 | } |
1036 | } |
1037 | |
1038 | maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL); |
1039 | if (!maps_node) { |
1040 | pr_err("failed to alloc struct pinctrl_maps\n"); |
1041 | return -ENOMEM; |
1042 | } |
1043 | |
1044 | maps_node->num_maps = num_maps; |
1045 | if (dup) { |
1046 | maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps, |
1047 | GFP_KERNEL); |
1048 | if (!maps_node->maps) { |
1049 | pr_err("failed to duplicate mapping table\n"); |
1050 | kfree(maps_node); |
1051 | return -ENOMEM; |
1052 | } |
1053 | } else { |
1054 | maps_node->maps = maps; |
1055 | } |
1056 | |
1057 | if (!locked) |
1058 | mutex_lock(&pinctrl_mutex); |
1059 | list_add_tail(&maps_node->node, &pinctrl_maps); |
1060 | if (!locked) |
1061 | mutex_unlock(&pinctrl_mutex); |
1062 | |
1063 | return 0; |
1064 | } |
1065 | |
1066 | /** |
1067 | * pinctrl_register_mappings() - register a set of pin controller mappings |
1068 | * @maps: the pincontrol mappings table to register. This should probably be |
1069 | * marked with __initdata so it can be discarded after boot. This |
1070 | * function will perform a shallow copy for the mapping entries. |
1071 | * @num_maps: the number of maps in the mapping table |
1072 | */ |
1073 | int pinctrl_register_mappings(struct pinctrl_map const *maps, |
1074 | unsigned num_maps) |
1075 | { |
1076 | return pinctrl_register_map(maps, num_maps, true, false); |
1077 | } |
1078 | |
1079 | void pinctrl_unregister_map(struct pinctrl_map const *map) |
1080 | { |
1081 | struct pinctrl_maps *maps_node; |
1082 | |
1083 | list_for_each_entry(maps_node, &pinctrl_maps, node) { |
1084 | if (maps_node->maps == map) { |
1085 | list_del(&maps_node->node); |
1086 | return; |
1087 | } |
1088 | } |
1089 | } |
1090 | |
1091 | /** |
1092 | * pinctrl_force_sleep() - turn a given controller device into sleep state |
1093 | * @pctldev: pin controller device |
1094 | */ |
1095 | int pinctrl_force_sleep(struct pinctrl_dev *pctldev) |
1096 | { |
1097 | if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep)) |
1098 | return pinctrl_select_state(pctldev->p, pctldev->hog_sleep); |
1099 | return 0; |
1100 | } |
1101 | EXPORT_SYMBOL_GPL(pinctrl_force_sleep); |
1102 | |
1103 | /** |
1104 | * pinctrl_force_default() - turn a given controller device into default state |
1105 | * @pctldev: pin controller device |
1106 | */ |
1107 | int pinctrl_force_default(struct pinctrl_dev *pctldev) |
1108 | { |
1109 | if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default)) |
1110 | return pinctrl_select_state(pctldev->p, pctldev->hog_default); |
1111 | return 0; |
1112 | } |
1113 | EXPORT_SYMBOL_GPL(pinctrl_force_default); |
1114 | |
1115 | #ifdef CONFIG_DEBUG_FS |
1116 | |
1117 | static int pinctrl_pins_show(struct seq_file *s, void *what) |
1118 | { |
1119 | struct pinctrl_dev *pctldev = s->private; |
1120 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
1121 | unsigned i, pin; |
1122 | |
1123 | seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); |
1124 | |
1125 | mutex_lock(&pinctrl_mutex); |
1126 | |
1127 | /* The pin number can be retrived from the pin controller descriptor */ |
1128 | for (i = 0; i < pctldev->desc->npins; i++) { |
1129 | struct pin_desc *desc; |
1130 | |
1131 | pin = pctldev->desc->pins[i].number; |
1132 | desc = pin_desc_get(pctldev, pin); |
1133 | /* Pin space may be sparse */ |
1134 | if (desc == NULL) |
1135 | continue; |
1136 | |
1137 | seq_printf(s, "pin %d (%s) ", pin, |
1138 | desc->name ? desc->name : "unnamed"); |
1139 | |
1140 | /* Driver-specific info per pin */ |
1141 | if (ops->pin_dbg_show) |
1142 | ops->pin_dbg_show(pctldev, s, pin); |
1143 | |
1144 | seq_puts(s, "\n"); |
1145 | } |
1146 | |
1147 | mutex_unlock(&pinctrl_mutex); |
1148 | |
1149 | return 0; |
1150 | } |
1151 | |
1152 | static int pinctrl_groups_show(struct seq_file *s, void *what) |
1153 | { |
1154 | struct pinctrl_dev *pctldev = s->private; |
1155 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
1156 | unsigned ngroups, selector = 0; |
1157 | |
1158 | ngroups = ops->get_groups_count(pctldev); |
1159 | mutex_lock(&pinctrl_mutex); |
1160 | |
1161 | seq_puts(s, "registered pin groups:\n"); |
1162 | while (selector < ngroups) { |
1163 | const unsigned *pins; |
1164 | unsigned num_pins; |
1165 | const char *gname = ops->get_group_name(pctldev, selector); |
1166 | const char *pname; |
1167 | int ret; |
1168 | int i; |
1169 | |
1170 | ret = ops->get_group_pins(pctldev, selector, |
1171 | &pins, &num_pins); |
1172 | if (ret) |
1173 | seq_printf(s, "%s [ERROR GETTING PINS]\n", |
1174 | gname); |
1175 | else { |
1176 | seq_printf(s, "group: %s\n", gname); |
1177 | for (i = 0; i < num_pins; i++) { |
1178 | pname = pin_get_name(pctldev, pins[i]); |
1179 | if (WARN_ON(!pname)) { |
1180 | mutex_unlock(&pinctrl_mutex); |
1181 | return -EINVAL; |
1182 | } |
1183 | seq_printf(s, "pin %d (%s)\n", pins[i], pname); |
1184 | } |
1185 | seq_puts(s, "\n"); |
1186 | } |
1187 | selector++; |
1188 | } |
1189 | |
1190 | mutex_unlock(&pinctrl_mutex); |
1191 | |
1192 | return 0; |
1193 | } |
1194 | |
1195 | static int pinctrl_gpioranges_show(struct seq_file *s, void *what) |
1196 | { |
1197 | struct pinctrl_dev *pctldev = s->private; |
1198 | struct pinctrl_gpio_range *range = NULL; |
1199 | |
1200 | seq_puts(s, "GPIO ranges handled:\n"); |
1201 | |
1202 | mutex_lock(&pinctrl_mutex); |
1203 | |
1204 | /* Loop over the ranges */ |
1205 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
1206 | seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
1207 | range->id, range->name, |
1208 | range->base, (range->base + range->npins - 1), |
1209 | range->pin_base, |
1210 | (range->pin_base + range->npins - 1)); |
1211 | } |
1212 | |
1213 | mutex_unlock(&pinctrl_mutex); |
1214 | |
1215 | return 0; |
1216 | } |
1217 | |
1218 | static int pinctrl_devices_show(struct seq_file *s, void *what) |
1219 | { |
1220 | struct pinctrl_dev *pctldev; |
1221 | |
1222 | seq_puts(s, "name [pinmux] [pinconf]\n"); |
1223 | |
1224 | mutex_lock(&pinctrl_mutex); |
1225 | |
1226 | list_for_each_entry(pctldev, &pinctrldev_list, node) { |
1227 | seq_printf(s, "%s ", pctldev->desc->name); |
1228 | if (pctldev->desc->pmxops) |
1229 | seq_puts(s, "yes "); |
1230 | else |
1231 | seq_puts(s, "no "); |
1232 | if (pctldev->desc->confops) |
1233 | seq_puts(s, "yes"); |
1234 | else |
1235 | seq_puts(s, "no"); |
1236 | seq_puts(s, "\n"); |
1237 | } |
1238 | |
1239 | mutex_unlock(&pinctrl_mutex); |
1240 | |
1241 | return 0; |
1242 | } |
1243 | |
1244 | static inline const char *map_type(enum pinctrl_map_type type) |
1245 | { |
1246 | static const char * const names[] = { |
1247 | "INVALID", |
1248 | "DUMMY_STATE", |
1249 | "MUX_GROUP", |
1250 | "CONFIGS_PIN", |
1251 | "CONFIGS_GROUP", |
1252 | }; |
1253 | |
1254 | if (type >= ARRAY_SIZE(names)) |
1255 | return "UNKNOWN"; |
1256 | |
1257 | return names[type]; |
1258 | } |
1259 | |
1260 | static int pinctrl_maps_show(struct seq_file *s, void *what) |
1261 | { |
1262 | struct pinctrl_maps *maps_node; |
1263 | int i; |
1264 | struct pinctrl_map const *map; |
1265 | |
1266 | seq_puts(s, "Pinctrl maps:\n"); |
1267 | |
1268 | mutex_lock(&pinctrl_mutex); |
1269 | |
1270 | for_each_maps(maps_node, i, map) { |
1271 | seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n", |
1272 | map->dev_name, map->name, map_type(map->type), |
1273 | map->type); |
1274 | |
1275 | if (map->type != PIN_MAP_TYPE_DUMMY_STATE) |
1276 | seq_printf(s, "controlling device %s\n", |
1277 | map->ctrl_dev_name); |
1278 | |
1279 | switch (map->type) { |
1280 | case PIN_MAP_TYPE_MUX_GROUP: |
1281 | pinmux_show_map(s, map); |
1282 | break; |
1283 | case PIN_MAP_TYPE_CONFIGS_PIN: |
1284 | case PIN_MAP_TYPE_CONFIGS_GROUP: |
1285 | pinconf_show_map(s, map); |
1286 | break; |
1287 | default: |
1288 | break; |
1289 | } |
1290 | |
1291 | seq_printf(s, "\n"); |
1292 | } |
1293 | |
1294 | mutex_unlock(&pinctrl_mutex); |
1295 | |
1296 | return 0; |
1297 | } |
1298 | |
1299 | static int pinctrl_show(struct seq_file *s, void *what) |
1300 | { |
1301 | struct pinctrl *p; |
1302 | struct pinctrl_state *state; |
1303 | struct pinctrl_setting *setting; |
1304 | |
1305 | seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); |
1306 | |
1307 | mutex_lock(&pinctrl_mutex); |
1308 | |
1309 | list_for_each_entry(p, &pinctrl_list, node) { |
1310 | seq_printf(s, "device: %s current state: %s\n", |
1311 | dev_name(p->dev), |
1312 | p->state ? p->state->name : "none"); |
1313 | |
1314 | list_for_each_entry(state, &p->states, node) { |
1315 | seq_printf(s, " state: %s\n", state->name); |
1316 | |
1317 | list_for_each_entry(setting, &state->settings, node) { |
1318 | struct pinctrl_dev *pctldev = setting->pctldev; |
1319 | |
1320 | seq_printf(s, " type: %s controller %s ", |
1321 | map_type(setting->type), |
1322 | pinctrl_dev_get_name(pctldev)); |
1323 | |
1324 | switch (setting->type) { |
1325 | case PIN_MAP_TYPE_MUX_GROUP: |
1326 | pinmux_show_setting(s, setting); |
1327 | break; |
1328 | case PIN_MAP_TYPE_CONFIGS_PIN: |
1329 | case PIN_MAP_TYPE_CONFIGS_GROUP: |
1330 | pinconf_show_setting(s, setting); |
1331 | break; |
1332 | default: |
1333 | break; |
1334 | } |
1335 | } |
1336 | } |
1337 | } |
1338 | |
1339 | mutex_unlock(&pinctrl_mutex); |
1340 | |
1341 | return 0; |
1342 | } |
1343 | |
1344 | static int pinctrl_pins_open(struct inode *inode, struct file *file) |
1345 | { |
1346 | return single_open(file, pinctrl_pins_show, inode->i_private); |
1347 | } |
1348 | |
1349 | static int pinctrl_groups_open(struct inode *inode, struct file *file) |
1350 | { |
1351 | return single_open(file, pinctrl_groups_show, inode->i_private); |
1352 | } |
1353 | |
1354 | static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) |
1355 | { |
1356 | return single_open(file, pinctrl_gpioranges_show, inode->i_private); |
1357 | } |
1358 | |
1359 | static int pinctrl_devices_open(struct inode *inode, struct file *file) |
1360 | { |
1361 | return single_open(file, pinctrl_devices_show, NULL); |
1362 | } |
1363 | |
1364 | static int pinctrl_maps_open(struct inode *inode, struct file *file) |
1365 | { |
1366 | return single_open(file, pinctrl_maps_show, NULL); |
1367 | } |
1368 | |
1369 | static int pinctrl_open(struct inode *inode, struct file *file) |
1370 | { |
1371 | return single_open(file, pinctrl_show, NULL); |
1372 | } |
1373 | |
1374 | static const struct file_operations pinctrl_pins_ops = { |
1375 | .open = pinctrl_pins_open, |
1376 | .read = seq_read, |
1377 | .llseek = seq_lseek, |
1378 | .release = single_release, |
1379 | }; |
1380 | |
1381 | static const struct file_operations pinctrl_groups_ops = { |
1382 | .open = pinctrl_groups_open, |
1383 | .read = seq_read, |
1384 | .llseek = seq_lseek, |
1385 | .release = single_release, |
1386 | }; |
1387 | |
1388 | static const struct file_operations pinctrl_gpioranges_ops = { |
1389 | .open = pinctrl_gpioranges_open, |
1390 | .read = seq_read, |
1391 | .llseek = seq_lseek, |
1392 | .release = single_release, |
1393 | }; |
1394 | |
1395 | static const struct file_operations pinctrl_devices_ops = { |
1396 | .open = pinctrl_devices_open, |
1397 | .read = seq_read, |
1398 | .llseek = seq_lseek, |
1399 | .release = single_release, |
1400 | }; |
1401 | |
1402 | static const struct file_operations pinctrl_maps_ops = { |
1403 | .open = pinctrl_maps_open, |
1404 | .read = seq_read, |
1405 | .llseek = seq_lseek, |
1406 | .release = single_release, |
1407 | }; |
1408 | |
1409 | static const struct file_operations pinctrl_ops = { |
1410 | .open = pinctrl_open, |
1411 | .read = seq_read, |
1412 | .llseek = seq_lseek, |
1413 | .release = single_release, |
1414 | }; |
1415 | |
1416 | static struct dentry *debugfs_root; |
1417 | |
1418 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) |
1419 | { |
1420 | struct dentry *device_root; |
1421 | |
1422 | device_root = debugfs_create_dir(dev_name(pctldev->dev), |
1423 | debugfs_root); |
1424 | pctldev->device_root = device_root; |
1425 | |
1426 | if (IS_ERR(device_root) || !device_root) { |
1427 | pr_warn("failed to create debugfs directory for %s\n", |
1428 | dev_name(pctldev->dev)); |
1429 | return; |
1430 | } |
1431 | debugfs_create_file("pins", S_IFREG | S_IRUGO, |
1432 | device_root, pctldev, &pinctrl_pins_ops); |
1433 | debugfs_create_file("pingroups", S_IFREG | S_IRUGO, |
1434 | device_root, pctldev, &pinctrl_groups_ops); |
1435 | debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, |
1436 | device_root, pctldev, &pinctrl_gpioranges_ops); |
1437 | pinmux_init_device_debugfs(device_root, pctldev); |
1438 | pinconf_init_device_debugfs(device_root, pctldev); |
1439 | } |
1440 | |
1441 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1442 | { |
1443 | debugfs_remove_recursive(pctldev->device_root); |
1444 | } |
1445 | |
1446 | static void pinctrl_init_debugfs(void) |
1447 | { |
1448 | debugfs_root = debugfs_create_dir("pinctrl", NULL); |
1449 | if (IS_ERR(debugfs_root) || !debugfs_root) { |
1450 | pr_warn("failed to create debugfs directory\n"); |
1451 | debugfs_root = NULL; |
1452 | return; |
1453 | } |
1454 | |
1455 | debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, |
1456 | debugfs_root, NULL, &pinctrl_devices_ops); |
1457 | debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, |
1458 | debugfs_root, NULL, &pinctrl_maps_ops); |
1459 | debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, |
1460 | debugfs_root, NULL, &pinctrl_ops); |
1461 | } |
1462 | |
1463 | #else /* CONFIG_DEBUG_FS */ |
1464 | |
1465 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) |
1466 | { |
1467 | } |
1468 | |
1469 | static void pinctrl_init_debugfs(void) |
1470 | { |
1471 | } |
1472 | |
1473 | static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
1474 | { |
1475 | } |
1476 | |
1477 | #endif |
1478 | |
1479 | static int pinctrl_check_ops(struct pinctrl_dev *pctldev) |
1480 | { |
1481 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
1482 | |
1483 | if (!ops || |
1484 | !ops->get_groups_count || |
1485 | !ops->get_group_name || |
1486 | !ops->get_group_pins) |
1487 | return -EINVAL; |
1488 | |
1489 | if (ops->dt_node_to_map && !ops->dt_free_map) |
1490 | return -EINVAL; |
1491 | |
1492 | return 0; |
1493 | } |
1494 | |
1495 | /** |
1496 | * pinctrl_register() - register a pin controller device |
1497 | * @pctldesc: descriptor for this pin controller |
1498 | * @dev: parent device for this pin controller |
1499 | * @driver_data: private pin controller data for this pin controller |
1500 | */ |
1501 | struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, |
1502 | struct device *dev, void *driver_data) |
1503 | { |
1504 | struct pinctrl_dev *pctldev; |
1505 | int ret; |
1506 | |
1507 | if (!pctldesc) |
1508 | return NULL; |
1509 | if (!pctldesc->name) |
1510 | return NULL; |
1511 | |
1512 | pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL); |
1513 | if (pctldev == NULL) { |
1514 | dev_err(dev, "failed to alloc struct pinctrl_dev\n"); |
1515 | return NULL; |
1516 | } |
1517 | |
1518 | /* Initialize pin control device struct */ |
1519 | pctldev->owner = pctldesc->owner; |
1520 | pctldev->desc = pctldesc; |
1521 | pctldev->driver_data = driver_data; |
1522 | INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); |
1523 | INIT_LIST_HEAD(&pctldev->gpio_ranges); |
1524 | pctldev->dev = dev; |
1525 | |
1526 | /* check core ops for sanity */ |
1527 | if (pinctrl_check_ops(pctldev)) { |
1528 | dev_err(dev, "pinctrl ops lacks necessary functions\n"); |
1529 | goto out_err; |
1530 | } |
1531 | |
1532 | /* If we're implementing pinmuxing, check the ops for sanity */ |
1533 | if (pctldesc->pmxops) { |
1534 | if (pinmux_check_ops(pctldev)) |
1535 | goto out_err; |
1536 | } |
1537 | |
1538 | /* If we're implementing pinconfig, check the ops for sanity */ |
1539 | if (pctldesc->confops) { |
1540 | if (pinconf_check_ops(pctldev)) |
1541 | goto out_err; |
1542 | } |
1543 | |
1544 | /* Register all the pins */ |
1545 | dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins); |
1546 | ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); |
1547 | if (ret) { |
1548 | dev_err(dev, "error during pin registration\n"); |
1549 | pinctrl_free_pindescs(pctldev, pctldesc->pins, |
1550 | pctldesc->npins); |
1551 | goto out_err; |
1552 | } |
1553 | |
1554 | mutex_lock(&pinctrl_mutex); |
1555 | |
1556 | list_add_tail(&pctldev->node, &pinctrldev_list); |
1557 | |
1558 | pctldev->p = pinctrl_get_locked(pctldev->dev); |
1559 | if (!IS_ERR(pctldev->p)) { |
1560 | pctldev->hog_default = |
1561 | pinctrl_lookup_state_locked(pctldev->p, |
1562 | PINCTRL_STATE_DEFAULT); |
1563 | if (IS_ERR(pctldev->hog_default)) { |
1564 | dev_dbg(dev, "failed to lookup the default state\n"); |
1565 | } else { |
1566 | if (pinctrl_select_state_locked(pctldev->p, |
1567 | pctldev->hog_default)) |
1568 | dev_err(dev, |
1569 | "failed to select default state\n"); |
1570 | } |
1571 | |
1572 | pctldev->hog_sleep = |
1573 | pinctrl_lookup_state_locked(pctldev->p, |
1574 | PINCTRL_STATE_SLEEP); |
1575 | if (IS_ERR(pctldev->hog_sleep)) |
1576 | dev_dbg(dev, "failed to lookup the sleep state\n"); |
1577 | } |
1578 | |
1579 | mutex_unlock(&pinctrl_mutex); |
1580 | |
1581 | pinctrl_init_device_debugfs(pctldev); |
1582 | |
1583 | return pctldev; |
1584 | |
1585 | out_err: |
1586 | kfree(pctldev); |
1587 | return NULL; |
1588 | } |
1589 | EXPORT_SYMBOL_GPL(pinctrl_register); |
1590 | |
1591 | /** |
1592 | * pinctrl_unregister() - unregister pinmux |
1593 | * @pctldev: pin controller to unregister |
1594 | * |
1595 | * Called by pinmux drivers to unregister a pinmux. |
1596 | */ |
1597 | void pinctrl_unregister(struct pinctrl_dev *pctldev) |
1598 | { |
1599 | struct pinctrl_gpio_range *range, *n; |
1600 | if (pctldev == NULL) |
1601 | return; |
1602 | |
1603 | pinctrl_remove_device_debugfs(pctldev); |
1604 | |
1605 | mutex_lock(&pinctrl_mutex); |
1606 | |
1607 | if (!IS_ERR(pctldev->p)) |
1608 | pinctrl_put_locked(pctldev->p, true); |
1609 | |
1610 | /* TODO: check that no pinmuxes are still active? */ |
1611 | list_del(&pctldev->node); |
1612 | /* Destroy descriptor tree */ |
1613 | pinctrl_free_pindescs(pctldev, pctldev->desc->pins, |
1614 | pctldev->desc->npins); |
1615 | /* remove gpio ranges map */ |
1616 | list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node) |
1617 | list_del(&range->node); |
1618 | |
1619 | kfree(pctldev); |
1620 | |
1621 | mutex_unlock(&pinctrl_mutex); |
1622 | } |
1623 | EXPORT_SYMBOL_GPL(pinctrl_unregister); |
1624 | |
1625 | static int __init pinctrl_init(void) |
1626 | { |
1627 | pr_info("initialized pinctrl subsystem\n"); |
1628 | pinctrl_init_debugfs(); |
1629 | return 0; |
1630 | } |
1631 | |
1632 | /* init early since many drivers really need to initialized pinmux early */ |
1633 | core_initcall(pinctrl_init); |
1634 |
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