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Commit | Line | Data |
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2744e8af LW |
1 | /* |
2 | * Core driver for the pin muxing portions of the pin control subsystem | |
3 | * | |
4 | * Copyright (C) 2011 ST-Ericsson SA | |
5 | * Written on behalf of Linaro for ST-Ericsson | |
6 | * Based on bits of regulator core, gpio core and clk core | |
7 | * | |
8 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
9 | * | |
10 | * License terms: GNU General Public License (GPL) version 2 | |
11 | */ | |
12 | #define pr_fmt(fmt) "pinmux core: " fmt | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/radix-tree.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/spinlock.h> | |
97607d15 | 24 | #include <linux/string.h> |
2744e8af LW |
25 | #include <linux/sysfs.h> |
26 | #include <linux/debugfs.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/pinctrl/machine.h> | |
29 | #include <linux/pinctrl/pinmux.h> | |
30 | #include "core.h" | |
31 | ||
32 | /* List of pinmuxes */ | |
33 | static DEFINE_MUTEX(pinmux_list_mutex); | |
34 | static LIST_HEAD(pinmux_list); | |
35 | ||
59b099b0 | 36 | /* Global pinmux maps */ |
97607d15 | 37 | static struct pinmux_map *pinmux_maps; |
2744e8af LW |
38 | static unsigned pinmux_maps_num; |
39 | ||
40 | /** | |
41 | * struct pinmux_group - group list item for pinmux groups | |
42 | * @node: pinmux group list node | |
43 | * @group_selector: the group selector for this group | |
44 | */ | |
45 | struct pinmux_group { | |
46 | struct list_head node; | |
47 | unsigned group_selector; | |
48 | }; | |
49 | ||
50 | /** | |
51 | * struct pinmux - per-device pinmux state holder | |
52 | * @node: global list node | |
53 | * @dev: the device using this pinmux | |
54 | * @usecount: the number of active users of this mux setting, used to keep | |
55 | * track of nested use cases | |
56 | * @pins: an array of discrete physical pins used in this mapping, taken | |
57 | * from the global pin enumeration space (copied from pinmux map) | |
58 | * @num_pins: the number of pins in this mapping array, i.e. the number of | |
59 | * elements in .pins so we can iterate over that array (copied from | |
60 | * pinmux map) | |
61 | * @pctldev: pin control device handling this pinmux | |
62 | * @func_selector: the function selector for the pinmux device handling | |
63 | * this pinmux | |
64 | * @groups: the group selectors for the pinmux device and | |
65 | * selector combination handling this pinmux, this is a list that | |
66 | * will be traversed on all pinmux operations such as | |
67 | * get/put/enable/disable | |
68 | * @mutex: a lock for the pinmux state holder | |
69 | */ | |
70 | struct pinmux { | |
71 | struct list_head node; | |
72 | struct device *dev; | |
73 | unsigned usecount; | |
74 | struct pinctrl_dev *pctldev; | |
75 | unsigned func_selector; | |
76 | struct list_head groups; | |
77 | struct mutex mutex; | |
78 | }; | |
79 | ||
80 | /** | |
81 | * struct pinmux_hog - a list item to stash mux hogs | |
82 | * @node: pinmux hog list node | |
83 | * @map: map entry responsible for this hogging | |
84 | * @pmx: the pinmux hogged by this item | |
85 | */ | |
86 | struct pinmux_hog { | |
87 | struct list_head node; | |
88 | struct pinmux_map const *map; | |
89 | struct pinmux *pmx; | |
90 | }; | |
91 | ||
92 | /** | |
93 | * pin_request() - request a single pin to be muxed in, typically for GPIO | |
94 | * @pin: the pin number in the global pin space | |
95 | * @function: a functional name to give to this pin, passed to the driver | |
96 | * so it knows what function to mux in, e.g. the string "gpioNN" | |
97 | * means that you want to mux in the pin for use as GPIO number NN | |
2744e8af LW |
98 | * @gpio_range: the range matching the GPIO pin if this is a request for a |
99 | * single GPIO pin | |
100 | */ | |
101 | static int pin_request(struct pinctrl_dev *pctldev, | |
3712a3c4 | 102 | int pin, const char *function, |
2744e8af LW |
103 | struct pinctrl_gpio_range *gpio_range) |
104 | { | |
105 | struct pin_desc *desc; | |
106 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
107 | int status = -EINVAL; | |
108 | ||
51cd24ee | 109 | dev_dbg(pctldev->dev, "request pin %d for %s\n", pin, function); |
2744e8af | 110 | |
2744e8af LW |
111 | desc = pin_desc_get(pctldev, pin); |
112 | if (desc == NULL) { | |
51cd24ee | 113 | dev_err(pctldev->dev, |
2744e8af LW |
114 | "pin is not registered so it cannot be requested\n"); |
115 | goto out; | |
116 | } | |
117 | ||
d2f6a1c6 | 118 | if (!function) { |
51cd24ee | 119 | dev_err(pctldev->dev, "no function name given\n"); |
d2f6a1c6 MB |
120 | return -EINVAL; |
121 | } | |
122 | ||
2744e8af | 123 | spin_lock(&desc->lock); |
5d2eaf80 | 124 | if (desc->mux_function) { |
2744e8af | 125 | spin_unlock(&desc->lock); |
51cd24ee | 126 | dev_err(pctldev->dev, |
2744e8af LW |
127 | "pin already requested\n"); |
128 | goto out; | |
129 | } | |
5d2eaf80 | 130 | desc->mux_function = function; |
2744e8af LW |
131 | spin_unlock(&desc->lock); |
132 | ||
133 | /* Let each pin increase references to this module */ | |
134 | if (!try_module_get(pctldev->owner)) { | |
51cd24ee | 135 | dev_err(pctldev->dev, |
2744e8af LW |
136 | "could not increase module refcount for pin %d\n", |
137 | pin); | |
138 | status = -EINVAL; | |
139 | goto out_free_pin; | |
140 | } | |
141 | ||
142 | /* | |
143 | * If there is no kind of request function for the pin we just assume | |
144 | * we got it by default and proceed. | |
145 | */ | |
3712a3c4 | 146 | if (gpio_range && ops->gpio_request_enable) |
2744e8af LW |
147 | /* This requests and enables a single GPIO pin */ |
148 | status = ops->gpio_request_enable(pctldev, gpio_range, pin); | |
149 | else if (ops->request) | |
150 | status = ops->request(pctldev, pin); | |
151 | else | |
152 | status = 0; | |
153 | ||
154 | if (status) | |
51cd24ee | 155 | dev_err(pctldev->dev, "->request on device %s failed " |
2744e8af LW |
156 | "for pin %d\n", |
157 | pctldev->desc->name, pin); | |
158 | out_free_pin: | |
159 | if (status) { | |
160 | spin_lock(&desc->lock); | |
5d2eaf80 | 161 | desc->mux_function = NULL; |
2744e8af LW |
162 | spin_unlock(&desc->lock); |
163 | } | |
164 | out: | |
165 | if (status) | |
51cd24ee | 166 | dev_err(pctldev->dev, "pin-%d (%s) status %d\n", |
2744e8af LW |
167 | pin, function ? : "?", status); |
168 | ||
169 | return status; | |
170 | } | |
171 | ||
172 | /** | |
173 | * pin_free() - release a single muxed in pin so something else can be muxed | |
174 | * @pctldev: pin controller device handling this pin | |
175 | * @pin: the pin to free | |
3712a3c4 SW |
176 | * @gpio_range: the range matching the GPIO pin if this is a request for a |
177 | * single GPIO pin | |
336cdba0 LW |
178 | * |
179 | * This function returns a pointer to the function name in use. This is used | |
180 | * for callers that dynamically allocate a function name so it can be freed | |
181 | * once the pin is free. This is done for GPIO request functions. | |
2744e8af | 182 | */ |
3712a3c4 SW |
183 | static const char *pin_free(struct pinctrl_dev *pctldev, int pin, |
184 | struct pinctrl_gpio_range *gpio_range) | |
2744e8af LW |
185 | { |
186 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
187 | struct pin_desc *desc; | |
3712a3c4 | 188 | const char *func; |
2744e8af LW |
189 | |
190 | desc = pin_desc_get(pctldev, pin); | |
191 | if (desc == NULL) { | |
51cd24ee | 192 | dev_err(pctldev->dev, |
2744e8af | 193 | "pin is not registered so it cannot be freed\n"); |
3712a3c4 | 194 | return NULL; |
2744e8af LW |
195 | } |
196 | ||
3712a3c4 SW |
197 | /* |
198 | * If there is no kind of request function for the pin we just assume | |
199 | * we got it by default and proceed. | |
200 | */ | |
201 | if (gpio_range && ops->gpio_disable_free) | |
202 | ops->gpio_disable_free(pctldev, gpio_range, pin); | |
203 | else if (ops->free) | |
2744e8af LW |
204 | ops->free(pctldev, pin); |
205 | ||
206 | spin_lock(&desc->lock); | |
3712a3c4 | 207 | func = desc->mux_function; |
5d2eaf80 | 208 | desc->mux_function = NULL; |
2744e8af LW |
209 | spin_unlock(&desc->lock); |
210 | module_put(pctldev->owner); | |
3712a3c4 SW |
211 | |
212 | return func; | |
2744e8af LW |
213 | } |
214 | ||
215 | /** | |
216 | * pinmux_request_gpio() - request a single pin to be muxed in as GPIO | |
217 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
542e704f LW |
218 | * |
219 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
220 | * as part of their gpio_request() semantics, platforms and individual drivers | |
221 | * shall *NOT* request GPIO pins to be muxed in. | |
2744e8af LW |
222 | */ |
223 | int pinmux_request_gpio(unsigned gpio) | |
224 | { | |
225 | char gpiostr[16]; | |
5d2eaf80 | 226 | const char *function; |
2744e8af LW |
227 | struct pinctrl_dev *pctldev; |
228 | struct pinctrl_gpio_range *range; | |
229 | int ret; | |
230 | int pin; | |
231 | ||
232 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
233 | if (ret) | |
234 | return -EINVAL; | |
235 | ||
236 | /* Convert to the pin controllers number space */ | |
3c739ad0 | 237 | pin = gpio - range->base + range->pin_base; |
2744e8af LW |
238 | |
239 | /* Conjure some name stating what chip and pin this is taken by */ | |
240 | snprintf(gpiostr, 15, "%s:%d", range->name, gpio); | |
241 | ||
5d2eaf80 SW |
242 | function = kstrdup(gpiostr, GFP_KERNEL); |
243 | if (!function) | |
244 | return -EINVAL; | |
245 | ||
3712a3c4 | 246 | ret = pin_request(pctldev, pin, function, range); |
5d2eaf80 SW |
247 | if (ret < 0) |
248 | kfree(function); | |
249 | ||
250 | return ret; | |
2744e8af LW |
251 | } |
252 | EXPORT_SYMBOL_GPL(pinmux_request_gpio); | |
253 | ||
254 | /** | |
255 | * pinmux_free_gpio() - free a single pin, currently used as GPIO | |
256 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
542e704f LW |
257 | * |
258 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
259 | * as part of their gpio_free() semantics, platforms and individual drivers | |
260 | * shall *NOT* request GPIO pins to be muxed out. | |
2744e8af LW |
261 | */ |
262 | void pinmux_free_gpio(unsigned gpio) | |
263 | { | |
264 | struct pinctrl_dev *pctldev; | |
265 | struct pinctrl_gpio_range *range; | |
266 | int ret; | |
267 | int pin; | |
3712a3c4 | 268 | const char *func; |
2744e8af LW |
269 | |
270 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
271 | if (ret) | |
272 | return; | |
273 | ||
274 | /* Convert to the pin controllers number space */ | |
3c739ad0 | 275 | pin = gpio - range->base + range->pin_base; |
2744e8af | 276 | |
3712a3c4 SW |
277 | func = pin_free(pctldev, pin, range); |
278 | kfree(func); | |
2744e8af LW |
279 | } |
280 | EXPORT_SYMBOL_GPL(pinmux_free_gpio); | |
281 | ||
542e704f LW |
282 | static int pinmux_gpio_direction(unsigned gpio, bool input) |
283 | { | |
284 | struct pinctrl_dev *pctldev; | |
285 | struct pinctrl_gpio_range *range; | |
286 | const struct pinmux_ops *ops; | |
287 | int ret; | |
288 | int pin; | |
289 | ||
290 | ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); | |
291 | if (ret) | |
292 | return ret; | |
293 | ||
294 | ops = pctldev->desc->pmxops; | |
295 | ||
296 | /* Convert to the pin controllers number space */ | |
297 | pin = gpio - range->base + range->pin_base; | |
298 | ||
299 | if (ops->gpio_set_direction) | |
300 | ret = ops->gpio_set_direction(pctldev, range, pin, input); | |
301 | else | |
302 | ret = 0; | |
303 | ||
304 | return ret; | |
305 | } | |
306 | ||
307 | /** | |
308 | * pinmux_gpio_direction_input() - request a GPIO pin to go into input mode | |
309 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
310 | * | |
311 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
312 | * as part of their gpio_direction_input() semantics, platforms and individual | |
313 | * drivers shall *NOT* touch pinmux GPIO calls. | |
314 | */ | |
315 | int pinmux_gpio_direction_input(unsigned gpio) | |
316 | { | |
317 | return pinmux_gpio_direction(gpio, true); | |
318 | } | |
319 | EXPORT_SYMBOL_GPL(pinmux_gpio_direction_input); | |
320 | ||
321 | /** | |
322 | * pinmux_gpio_direction_output() - request a GPIO pin to go into output mode | |
323 | * @gpio: the GPIO pin number from the GPIO subsystem number space | |
324 | * | |
325 | * This function should *ONLY* be used from gpiolib-based GPIO drivers, | |
326 | * as part of their gpio_direction_output() semantics, platforms and individual | |
327 | * drivers shall *NOT* touch pinmux GPIO calls. | |
328 | */ | |
329 | int pinmux_gpio_direction_output(unsigned gpio) | |
330 | { | |
331 | return pinmux_gpio_direction(gpio, false); | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(pinmux_gpio_direction_output); | |
334 | ||
2744e8af LW |
335 | /** |
336 | * pinmux_register_mappings() - register a set of pinmux mappings | |
97607d15 LW |
337 | * @maps: the pinmux mappings table to register, this should be marked with |
338 | * __initdata so it can be discarded after boot, this function will | |
339 | * perform a shallow copy for the mapping entries. | |
2744e8af LW |
340 | * @num_maps: the number of maps in the mapping table |
341 | * | |
342 | * Only call this once during initialization of your machine, the function is | |
343 | * tagged as __init and won't be callable after init has completed. The map | |
344 | * passed into this function will be owned by the pinmux core and cannot be | |
e6337c3c | 345 | * freed. |
2744e8af LW |
346 | */ |
347 | int __init pinmux_register_mappings(struct pinmux_map const *maps, | |
348 | unsigned num_maps) | |
349 | { | |
59b099b0 | 350 | void *tmp_maps; |
2744e8af LW |
351 | int i; |
352 | ||
2744e8af | 353 | pr_debug("add %d pinmux maps\n", num_maps); |
97607d15 | 354 | |
59b099b0 | 355 | /* First sanity check the new mapping */ |
2744e8af | 356 | for (i = 0; i < num_maps; i++) { |
2744e8af LW |
357 | if (!maps[i].name) { |
358 | pr_err("failed to register map %d: " | |
359 | "no map name given\n", i); | |
59b099b0 | 360 | return -EINVAL; |
2744e8af | 361 | } |
97607d15 | 362 | |
2744e8af LW |
363 | if (!maps[i].ctrl_dev && !maps[i].ctrl_dev_name) { |
364 | pr_err("failed to register map %s (%d): " | |
365 | "no pin control device given\n", | |
366 | maps[i].name, i); | |
59b099b0 | 367 | return -EINVAL; |
2744e8af | 368 | } |
97607d15 | 369 | |
2744e8af LW |
370 | if (!maps[i].function) { |
371 | pr_err("failed to register map %s (%d): " | |
372 | "no function ID given\n", maps[i].name, i); | |
59b099b0 | 373 | return -EINVAL; |
2744e8af LW |
374 | } |
375 | ||
376 | if (!maps[i].dev && !maps[i].dev_name) | |
377 | pr_debug("add system map %s function %s with no device\n", | |
378 | maps[i].name, | |
379 | maps[i].function); | |
380 | else | |
381 | pr_debug("register map %s, function %s\n", | |
382 | maps[i].name, | |
383 | maps[i].function); | |
59b099b0 | 384 | } |
2744e8af | 385 | |
59b099b0 LW |
386 | /* |
387 | * Make a copy of the map array - string pointers will end up in the | |
388 | * kernel const section anyway so these do not need to be deep copied. | |
389 | */ | |
390 | if (!pinmux_maps_num) { | |
391 | /* On first call, just copy them */ | |
392 | tmp_maps = kmemdup(maps, | |
393 | sizeof(struct pinmux_map) * num_maps, | |
394 | GFP_KERNEL); | |
395 | if (!tmp_maps) | |
396 | return -ENOMEM; | |
397 | } else { | |
398 | /* Subsequent calls, reallocate array to new size */ | |
399 | size_t oldsize = sizeof(struct pinmux_map) * pinmux_maps_num; | |
400 | size_t newsize = sizeof(struct pinmux_map) * num_maps; | |
401 | ||
402 | tmp_maps = krealloc(pinmux_maps, oldsize + newsize, GFP_KERNEL); | |
403 | if (!tmp_maps) | |
404 | return -ENOMEM; | |
405 | memcpy((tmp_maps + oldsize), maps, newsize); | |
97607d15 | 406 | } |
2744e8af | 407 | |
59b099b0 LW |
408 | pinmux_maps = tmp_maps; |
409 | pinmux_maps_num += num_maps; | |
2744e8af LW |
410 | return 0; |
411 | } | |
412 | ||
413 | /** | |
414 | * acquire_pins() - acquire all the pins for a certain funcion on a pinmux | |
415 | * @pctldev: the device to take the pins on | |
416 | * @func_selector: the function selector to acquire the pins for | |
417 | * @group_selector: the group selector containing the pins to acquire | |
418 | */ | |
419 | static int acquire_pins(struct pinctrl_dev *pctldev, | |
420 | unsigned func_selector, | |
421 | unsigned group_selector) | |
422 | { | |
423 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
424 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; | |
425 | const char *func = pmxops->get_function_name(pctldev, | |
426 | func_selector); | |
a5818a8b | 427 | const unsigned *pins; |
2744e8af LW |
428 | unsigned num_pins; |
429 | int ret; | |
430 | int i; | |
431 | ||
432 | ret = pctlops->get_group_pins(pctldev, group_selector, | |
433 | &pins, &num_pins); | |
434 | if (ret) | |
435 | return ret; | |
436 | ||
51cd24ee | 437 | dev_dbg(pctldev->dev, "requesting the %u pins from group %u\n", |
2744e8af LW |
438 | num_pins, group_selector); |
439 | ||
440 | /* Try to allocate all pins in this group, one by one */ | |
441 | for (i = 0; i < num_pins; i++) { | |
3712a3c4 | 442 | ret = pin_request(pctldev, pins[i], func, NULL); |
2744e8af | 443 | if (ret) { |
51cd24ee | 444 | dev_err(pctldev->dev, |
2744e8af LW |
445 | "could not get pin %d for function %s " |
446 | "on device %s - conflicting mux mappings?\n", | |
447 | pins[i], func ? : "(undefined)", | |
448 | pinctrl_dev_get_name(pctldev)); | |
449 | /* On error release all taken pins */ | |
450 | i--; /* this pin just failed */ | |
451 | for (; i >= 0; i--) | |
3712a3c4 | 452 | pin_free(pctldev, pins[i], NULL); |
2744e8af LW |
453 | return -ENODEV; |
454 | } | |
455 | } | |
456 | return 0; | |
457 | } | |
458 | ||
459 | /** | |
460 | * release_pins() - release pins taken by earlier acquirement | |
461 | * @pctldev: the device to free the pinx on | |
462 | * @group_selector: the group selector containing the pins to free | |
463 | */ | |
464 | static void release_pins(struct pinctrl_dev *pctldev, | |
465 | unsigned group_selector) | |
466 | { | |
467 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
a5818a8b | 468 | const unsigned *pins; |
2744e8af LW |
469 | unsigned num_pins; |
470 | int ret; | |
471 | int i; | |
472 | ||
473 | ret = pctlops->get_group_pins(pctldev, group_selector, | |
474 | &pins, &num_pins); | |
475 | if (ret) { | |
51cd24ee | 476 | dev_err(pctldev->dev, "could not get pins to release for " |
2744e8af LW |
477 | "group selector %d\n", |
478 | group_selector); | |
479 | return; | |
480 | } | |
481 | for (i = 0; i < num_pins; i++) | |
3712a3c4 | 482 | pin_free(pctldev, pins[i], NULL); |
2744e8af LW |
483 | } |
484 | ||
2744e8af LW |
485 | /** |
486 | * pinmux_check_pin_group() - check function and pin group combo | |
487 | * @pctldev: device to check the pin group vs function for | |
488 | * @func_selector: the function selector to check the pin group for, we have | |
489 | * already looked this up in the calling function | |
490 | * @pin_group: the pin group to match to the function | |
491 | * | |
492 | * This function will check that the pinmux driver can supply the | |
493 | * selected pin group for a certain function, returns the group selector if | |
494 | * the group and function selector will work fine together, else returns | |
495 | * negative | |
496 | */ | |
497 | static int pinmux_check_pin_group(struct pinctrl_dev *pctldev, | |
498 | unsigned func_selector, | |
499 | const char *pin_group) | |
500 | { | |
501 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; | |
502 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
503 | int ret; | |
504 | ||
505 | /* | |
506 | * If the driver does not support different pin groups for the | |
507 | * functions, we only support group 0, and assume this exists. | |
508 | */ | |
509 | if (!pctlops || !pctlops->list_groups) | |
510 | return 0; | |
511 | ||
512 | /* | |
513 | * Passing NULL (no specific group) will select the first and | |
514 | * hopefully only group of pins available for this function. | |
515 | */ | |
516 | if (!pin_group) { | |
517 | char const * const *groups; | |
518 | unsigned num_groups; | |
519 | ||
520 | ret = pmxops->get_function_groups(pctldev, func_selector, | |
521 | &groups, &num_groups); | |
522 | if (ret) | |
523 | return ret; | |
524 | if (num_groups < 1) | |
525 | return -EINVAL; | |
7afde8ba | 526 | ret = pinctrl_get_group_selector(pctldev, groups[0]); |
2744e8af | 527 | if (ret < 0) { |
51cd24ee | 528 | dev_err(pctldev->dev, |
2744e8af LW |
529 | "function %s wants group %s but the pin " |
530 | "controller does not seem to have that group\n", | |
531 | pmxops->get_function_name(pctldev, func_selector), | |
532 | groups[0]); | |
533 | return ret; | |
534 | } | |
535 | ||
536 | if (num_groups > 1) | |
51cd24ee | 537 | dev_dbg(pctldev->dev, |
2744e8af LW |
538 | "function %s support more than one group, " |
539 | "default-selecting first group %s (%d)\n", | |
540 | pmxops->get_function_name(pctldev, func_selector), | |
541 | groups[0], | |
542 | ret); | |
543 | ||
544 | return ret; | |
545 | } | |
546 | ||
51cd24ee | 547 | dev_dbg(pctldev->dev, |
2744e8af LW |
548 | "check if we have pin group %s on controller %s\n", |
549 | pin_group, pinctrl_dev_get_name(pctldev)); | |
550 | ||
7afde8ba | 551 | ret = pinctrl_get_group_selector(pctldev, pin_group); |
2744e8af | 552 | if (ret < 0) { |
51cd24ee | 553 | dev_dbg(pctldev->dev, |
2744e8af LW |
554 | "%s does not support pin group %s with function %s\n", |
555 | pinctrl_dev_get_name(pctldev), | |
556 | pin_group, | |
557 | pmxops->get_function_name(pctldev, func_selector)); | |
558 | } | |
559 | return ret; | |
560 | } | |
561 | ||
562 | /** | |
563 | * pinmux_search_function() - check pin control driver for a certain function | |
564 | * @pctldev: device to check for function and position | |
565 | * @map: function map containing the function and position to look for | |
566 | * @func_selector: returns the applicable function selector if found | |
567 | * @group_selector: returns the applicable group selector if found | |
568 | * | |
569 | * This will search the pinmux driver for an applicable | |
570 | * function with a specific pin group, returns 0 if these can be mapped | |
571 | * negative otherwise | |
572 | */ | |
573 | static int pinmux_search_function(struct pinctrl_dev *pctldev, | |
574 | struct pinmux_map const *map, | |
575 | unsigned *func_selector, | |
576 | unsigned *group_selector) | |
577 | { | |
578 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
579 | unsigned selector = 0; | |
580 | ||
581 | /* See if this pctldev has this function */ | |
582 | while (ops->list_functions(pctldev, selector) >= 0) { | |
583 | const char *fname = ops->get_function_name(pctldev, | |
584 | selector); | |
585 | int ret; | |
586 | ||
587 | if (!strcmp(map->function, fname)) { | |
588 | /* Found the function, check pin group */ | |
589 | ret = pinmux_check_pin_group(pctldev, selector, | |
590 | map->group); | |
591 | if (ret < 0) | |
592 | return ret; | |
593 | ||
594 | /* This function and group selector can be used */ | |
595 | *func_selector = selector; | |
596 | *group_selector = ret; | |
597 | return 0; | |
598 | ||
599 | } | |
600 | selector++; | |
601 | } | |
602 | ||
603 | pr_err("%s does not support function %s\n", | |
604 | pinctrl_dev_get_name(pctldev), map->function); | |
605 | return -EINVAL; | |
606 | } | |
607 | ||
608 | /** | |
609 | * pinmux_enable_muxmap() - enable a map entry for a certain pinmux | |
610 | */ | |
611 | static int pinmux_enable_muxmap(struct pinctrl_dev *pctldev, | |
612 | struct pinmux *pmx, | |
613 | struct device *dev, | |
614 | const char *devname, | |
615 | struct pinmux_map const *map) | |
616 | { | |
617 | unsigned func_selector; | |
618 | unsigned group_selector; | |
619 | struct pinmux_group *grp; | |
620 | int ret; | |
621 | ||
622 | /* | |
623 | * Note that we're not locking the pinmux mutex here, because | |
624 | * this is only called at pinmux initialization time when it | |
625 | * has not been added to any list and thus is not reachable | |
626 | * by anyone else. | |
627 | */ | |
628 | ||
629 | if (pmx->pctldev && pmx->pctldev != pctldev) { | |
51cd24ee | 630 | dev_err(pctldev->dev, |
2744e8af LW |
631 | "different pin control devices given for device %s, " |
632 | "function %s\n", | |
633 | devname, | |
634 | map->function); | |
635 | return -EINVAL; | |
636 | } | |
637 | pmx->dev = dev; | |
638 | pmx->pctldev = pctldev; | |
639 | ||
640 | /* Now go into the driver and try to match a function and group */ | |
641 | ret = pinmux_search_function(pctldev, map, &func_selector, | |
642 | &group_selector); | |
643 | if (ret < 0) | |
644 | return ret; | |
645 | ||
646 | /* | |
647 | * If the function selector is already set, it needs to be identical, | |
648 | * we support several groups with one function but not several | |
649 | * functions with one or several groups in the same pinmux. | |
650 | */ | |
651 | if (pmx->func_selector != UINT_MAX && | |
652 | pmx->func_selector != func_selector) { | |
51cd24ee | 653 | dev_err(pctldev->dev, |
2744e8af LW |
654 | "dual function defines in the map for device %s\n", |
655 | devname); | |
656 | return -EINVAL; | |
657 | } | |
658 | pmx->func_selector = func_selector; | |
659 | ||
660 | /* Now add this group selector, we may have many of them */ | |
661 | grp = kmalloc(sizeof(struct pinmux_group), GFP_KERNEL); | |
662 | if (!grp) | |
663 | return -ENOMEM; | |
664 | grp->group_selector = group_selector; | |
665 | ret = acquire_pins(pctldev, func_selector, group_selector); | |
666 | if (ret) { | |
667 | kfree(grp); | |
668 | return ret; | |
669 | } | |
670 | list_add(&grp->node, &pmx->groups); | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | static void pinmux_free_groups(struct pinmux *pmx) | |
676 | { | |
677 | struct list_head *node, *tmp; | |
678 | ||
679 | list_for_each_safe(node, tmp, &pmx->groups) { | |
680 | struct pinmux_group *grp = | |
681 | list_entry(node, struct pinmux_group, node); | |
682 | /* Release all pins taken by this group */ | |
683 | release_pins(pmx->pctldev, grp->group_selector); | |
684 | list_del(node); | |
685 | kfree(grp); | |
686 | } | |
687 | } | |
688 | ||
689 | /** | |
690 | * pinmux_get() - retrieves the pinmux for a certain device | |
691 | * @dev: the device to get the pinmux for | |
692 | * @name: an optional specific mux mapping name or NULL, the name is only | |
693 | * needed if you want to have more than one mapping per device, or if you | |
694 | * need an anonymous pinmux (not tied to any specific device) | |
695 | */ | |
696 | struct pinmux *pinmux_get(struct device *dev, const char *name) | |
697 | { | |
698 | ||
699 | struct pinmux_map const *map = NULL; | |
700 | struct pinctrl_dev *pctldev = NULL; | |
701 | const char *devname = NULL; | |
702 | struct pinmux *pmx; | |
703 | bool found_map; | |
704 | unsigned num_maps = 0; | |
705 | int ret = -ENODEV; | |
706 | int i; | |
707 | ||
708 | /* We must have dev or ID or both */ | |
709 | if (!dev && !name) | |
710 | return ERR_PTR(-EINVAL); | |
711 | ||
712 | if (dev) | |
713 | devname = dev_name(dev); | |
714 | ||
715 | pr_debug("get mux %s for device %s\n", name, | |
716 | devname ? devname : "(none)"); | |
717 | ||
718 | /* | |
719 | * create the state cookie holder struct pinmux for each | |
720 | * mapping, this is what consumers will get when requesting | |
721 | * a pinmux handle with pinmux_get() | |
722 | */ | |
723 | pmx = kzalloc(sizeof(struct pinmux), GFP_KERNEL); | |
724 | if (pmx == NULL) | |
725 | return ERR_PTR(-ENOMEM); | |
726 | mutex_init(&pmx->mutex); | |
727 | pmx->func_selector = UINT_MAX; | |
728 | INIT_LIST_HEAD(&pmx->groups); | |
729 | ||
730 | /* Iterate over the pinmux maps to locate the right ones */ | |
731 | for (i = 0; i < pinmux_maps_num; i++) { | |
732 | map = &pinmux_maps[i]; | |
733 | found_map = false; | |
734 | ||
735 | /* | |
736 | * First, try to find the pctldev given in the map | |
737 | */ | |
738 | pctldev = get_pinctrl_dev_from_dev(map->ctrl_dev, | |
739 | map->ctrl_dev_name); | |
740 | if (!pctldev) { | |
741 | const char *devname = NULL; | |
742 | ||
743 | if (map->ctrl_dev) | |
744 | devname = dev_name(map->ctrl_dev); | |
745 | else if (map->ctrl_dev_name) | |
746 | devname = map->ctrl_dev_name; | |
747 | ||
748 | pr_warning("could not find a pinctrl device for pinmux " | |
749 | "function %s, fishy, they shall all have one\n", | |
750 | map->function); | |
751 | pr_warning("given pinctrl device name: %s", | |
752 | devname ? devname : "UNDEFINED"); | |
753 | ||
754 | /* Continue to check the other mappings anyway... */ | |
755 | continue; | |
756 | } | |
757 | ||
758 | pr_debug("in map, found pctldev %s to handle function %s", | |
51cd24ee | 759 | dev_name(pctldev->dev), map->function); |
2744e8af LW |
760 | |
761 | ||
762 | /* | |
763 | * If we're looking for a specific named map, this must match, | |
764 | * else we loop and look for the next. | |
765 | */ | |
766 | if (name != NULL) { | |
767 | if (map->name == NULL) | |
768 | continue; | |
769 | if (strcmp(map->name, name)) | |
770 | continue; | |
771 | } | |
772 | ||
773 | /* | |
774 | * This is for the case where no device name is given, we | |
775 | * already know that the function name matches from above | |
776 | * code. | |
777 | */ | |
778 | if (!map->dev_name && (name != NULL)) | |
779 | found_map = true; | |
780 | ||
781 | /* If the mapping has a device set up it must match */ | |
782 | if (map->dev_name && | |
783 | (!devname || !strcmp(map->dev_name, devname))) | |
784 | /* MATCH! */ | |
785 | found_map = true; | |
786 | ||
787 | /* If this map is applicable, then apply it */ | |
788 | if (found_map) { | |
789 | ret = pinmux_enable_muxmap(pctldev, pmx, dev, | |
790 | devname, map); | |
791 | if (ret) { | |
792 | pinmux_free_groups(pmx); | |
793 | kfree(pmx); | |
794 | return ERR_PTR(ret); | |
795 | } | |
796 | num_maps++; | |
797 | } | |
798 | } | |
799 | ||
800 | ||
801 | /* We should have atleast one map, right */ | |
802 | if (!num_maps) { | |
803 | pr_err("could not find any mux maps for device %s, ID %s\n", | |
804 | devname ? devname : "(anonymous)", | |
805 | name ? name : "(undefined)"); | |
806 | kfree(pmx); | |
807 | return ERR_PTR(-EINVAL); | |
808 | } | |
809 | ||
810 | pr_debug("found %u mux maps for device %s, UD %s\n", | |
811 | num_maps, | |
812 | devname ? devname : "(anonymous)", | |
813 | name ? name : "(undefined)"); | |
814 | ||
815 | /* Add the pinmux to the global list */ | |
816 | mutex_lock(&pinmux_list_mutex); | |
817 | list_add(&pmx->node, &pinmux_list); | |
818 | mutex_unlock(&pinmux_list_mutex); | |
819 | ||
820 | return pmx; | |
821 | } | |
822 | EXPORT_SYMBOL_GPL(pinmux_get); | |
823 | ||
824 | /** | |
825 | * pinmux_put() - release a previously claimed pinmux | |
826 | * @pmx: a pinmux previously claimed by pinmux_get() | |
827 | */ | |
828 | void pinmux_put(struct pinmux *pmx) | |
829 | { | |
830 | if (pmx == NULL) | |
831 | return; | |
832 | ||
833 | mutex_lock(&pmx->mutex); | |
834 | if (pmx->usecount) | |
835 | pr_warn("releasing pinmux with active users!\n"); | |
836 | /* Free the groups and all acquired pins */ | |
837 | pinmux_free_groups(pmx); | |
838 | mutex_unlock(&pmx->mutex); | |
839 | ||
840 | /* Remove from list */ | |
841 | mutex_lock(&pinmux_list_mutex); | |
842 | list_del(&pmx->node); | |
843 | mutex_unlock(&pinmux_list_mutex); | |
844 | ||
845 | kfree(pmx); | |
846 | } | |
847 | EXPORT_SYMBOL_GPL(pinmux_put); | |
848 | ||
849 | /** | |
850 | * pinmux_enable() - enable a certain pinmux setting | |
851 | * @pmx: the pinmux to enable, previously claimed by pinmux_get() | |
852 | */ | |
853 | int pinmux_enable(struct pinmux *pmx) | |
854 | { | |
855 | int ret = 0; | |
856 | ||
857 | if (pmx == NULL) | |
858 | return -EINVAL; | |
859 | mutex_lock(&pmx->mutex); | |
860 | if (pmx->usecount++ == 0) { | |
861 | struct pinctrl_dev *pctldev = pmx->pctldev; | |
862 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
863 | struct pinmux_group *grp; | |
864 | ||
865 | list_for_each_entry(grp, &pmx->groups, node) { | |
866 | ret = ops->enable(pctldev, pmx->func_selector, | |
867 | grp->group_selector); | |
868 | if (ret) { | |
869 | /* | |
870 | * TODO: call disable() on all groups we called | |
871 | * enable() on to this point? | |
872 | */ | |
873 | pmx->usecount--; | |
874 | break; | |
875 | } | |
876 | } | |
877 | } | |
878 | mutex_unlock(&pmx->mutex); | |
879 | return ret; | |
880 | } | |
881 | EXPORT_SYMBOL_GPL(pinmux_enable); | |
882 | ||
883 | /** | |
884 | * pinmux_disable() - disable a certain pinmux setting | |
885 | * @pmx: the pinmux to disable, previously claimed by pinmux_get() | |
886 | */ | |
887 | void pinmux_disable(struct pinmux *pmx) | |
888 | { | |
889 | if (pmx == NULL) | |
890 | return; | |
891 | ||
892 | mutex_lock(&pmx->mutex); | |
893 | if (--pmx->usecount == 0) { | |
894 | struct pinctrl_dev *pctldev = pmx->pctldev; | |
895 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
896 | struct pinmux_group *grp; | |
897 | ||
898 | list_for_each_entry(grp, &pmx->groups, node) { | |
899 | ops->disable(pctldev, pmx->func_selector, | |
900 | grp->group_selector); | |
901 | } | |
902 | } | |
903 | mutex_unlock(&pmx->mutex); | |
904 | } | |
905 | EXPORT_SYMBOL_GPL(pinmux_disable); | |
906 | ||
907 | int pinmux_check_ops(const struct pinmux_ops *ops) | |
908 | { | |
909 | /* Check that we implement required operations */ | |
910 | if (!ops->list_functions || | |
911 | !ops->get_function_name || | |
912 | !ops->get_function_groups || | |
913 | !ops->enable || | |
914 | !ops->disable) | |
915 | return -EINVAL; | |
916 | ||
917 | return 0; | |
918 | } | |
919 | ||
920 | /* Hog a single map entry and add to the hoglist */ | |
921 | static int pinmux_hog_map(struct pinctrl_dev *pctldev, | |
922 | struct pinmux_map const *map) | |
923 | { | |
924 | struct pinmux_hog *hog; | |
925 | struct pinmux *pmx; | |
926 | int ret; | |
927 | ||
928 | if (map->dev || map->dev_name) { | |
929 | /* | |
930 | * TODO: the day we have device tree support, we can | |
931 | * traverse the device tree and hog to specific device nodes | |
932 | * without any problems, so then we can hog pinmuxes for | |
933 | * all devices that just want a static pin mux at this point. | |
934 | */ | |
51cd24ee | 935 | dev_err(pctldev->dev, "map %s wants to hog a non-system " |
2744e8af LW |
936 | "pinmux, this is not going to work\n", map->name); |
937 | return -EINVAL; | |
938 | } | |
939 | ||
940 | hog = kzalloc(sizeof(struct pinmux_hog), GFP_KERNEL); | |
941 | if (!hog) | |
942 | return -ENOMEM; | |
943 | ||
944 | pmx = pinmux_get(NULL, map->name); | |
945 | if (IS_ERR(pmx)) { | |
946 | kfree(hog); | |
51cd24ee | 947 | dev_err(pctldev->dev, |
2744e8af LW |
948 | "could not get the %s pinmux mapping for hogging\n", |
949 | map->name); | |
950 | return PTR_ERR(pmx); | |
951 | } | |
952 | ||
953 | ret = pinmux_enable(pmx); | |
954 | if (ret) { | |
955 | pinmux_put(pmx); | |
956 | kfree(hog); | |
51cd24ee | 957 | dev_err(pctldev->dev, |
2744e8af LW |
958 | "could not enable the %s pinmux mapping for hogging\n", |
959 | map->name); | |
960 | return ret; | |
961 | } | |
962 | ||
963 | hog->map = map; | |
964 | hog->pmx = pmx; | |
965 | ||
51cd24ee | 966 | dev_info(pctldev->dev, "hogged map %s, function %s\n", map->name, |
2744e8af LW |
967 | map->function); |
968 | mutex_lock(&pctldev->pinmux_hogs_lock); | |
969 | list_add(&hog->node, &pctldev->pinmux_hogs); | |
970 | mutex_unlock(&pctldev->pinmux_hogs_lock); | |
971 | ||
972 | return 0; | |
973 | } | |
974 | ||
975 | /** | |
976 | * pinmux_hog_maps() - hog specific map entries on controller device | |
977 | * @pctldev: the pin control device to hog entries on | |
978 | * | |
979 | * When the pin controllers are registered, there may be some specific pinmux | |
980 | * map entries that need to be hogged, i.e. get+enabled until the system shuts | |
981 | * down. | |
982 | */ | |
983 | int pinmux_hog_maps(struct pinctrl_dev *pctldev) | |
984 | { | |
51cd24ee | 985 | struct device *dev = pctldev->dev; |
2744e8af LW |
986 | const char *devname = dev_name(dev); |
987 | int ret; | |
988 | int i; | |
989 | ||
990 | INIT_LIST_HEAD(&pctldev->pinmux_hogs); | |
991 | mutex_init(&pctldev->pinmux_hogs_lock); | |
992 | ||
993 | for (i = 0; i < pinmux_maps_num; i++) { | |
994 | struct pinmux_map const *map = &pinmux_maps[i]; | |
995 | ||
996 | if (((map->ctrl_dev == dev) || | |
997 | !strcmp(map->ctrl_dev_name, devname)) && | |
998 | map->hog_on_boot) { | |
999 | /* OK time to hog! */ | |
1000 | ret = pinmux_hog_map(pctldev, map); | |
1001 | if (ret) | |
1002 | return ret; | |
1003 | } | |
1004 | } | |
1005 | return 0; | |
1006 | } | |
1007 | ||
1008 | /** | |
336cdba0 | 1009 | * pinmux_unhog_maps() - unhog specific map entries on controller device |
2744e8af LW |
1010 | * @pctldev: the pin control device to unhog entries on |
1011 | */ | |
1012 | void pinmux_unhog_maps(struct pinctrl_dev *pctldev) | |
1013 | { | |
1014 | struct list_head *node, *tmp; | |
1015 | ||
1016 | mutex_lock(&pctldev->pinmux_hogs_lock); | |
1017 | list_for_each_safe(node, tmp, &pctldev->pinmux_hogs) { | |
1018 | struct pinmux_hog *hog = | |
1019 | list_entry(node, struct pinmux_hog, node); | |
1020 | pinmux_disable(hog->pmx); | |
1021 | pinmux_put(hog->pmx); | |
1022 | list_del(node); | |
1023 | kfree(hog); | |
1024 | } | |
1025 | mutex_unlock(&pctldev->pinmux_hogs_lock); | |
1026 | } | |
1027 | ||
1028 | #ifdef CONFIG_DEBUG_FS | |
1029 | ||
1030 | /* Called from pincontrol core */ | |
1031 | static int pinmux_functions_show(struct seq_file *s, void *what) | |
1032 | { | |
1033 | struct pinctrl_dev *pctldev = s->private; | |
1034 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; | |
1035 | unsigned func_selector = 0; | |
1036 | ||
1037 | while (pmxops->list_functions(pctldev, func_selector) >= 0) { | |
1038 | const char *func = pmxops->get_function_name(pctldev, | |
1039 | func_selector); | |
1040 | const char * const *groups; | |
1041 | unsigned num_groups; | |
1042 | int ret; | |
1043 | int i; | |
1044 | ||
1045 | ret = pmxops->get_function_groups(pctldev, func_selector, | |
1046 | &groups, &num_groups); | |
1047 | if (ret) | |
1048 | seq_printf(s, "function %s: COULD NOT GET GROUPS\n", | |
1049 | func); | |
1050 | ||
1051 | seq_printf(s, "function: %s, groups = [ ", func); | |
1052 | for (i = 0; i < num_groups; i++) | |
1053 | seq_printf(s, "%s ", groups[i]); | |
1054 | seq_puts(s, "]\n"); | |
1055 | ||
1056 | func_selector++; | |
1057 | ||
1058 | } | |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | static int pinmux_pins_show(struct seq_file *s, void *what) | |
1064 | { | |
1065 | struct pinctrl_dev *pctldev = s->private; | |
706e8520 | 1066 | unsigned i, pin; |
2744e8af LW |
1067 | |
1068 | seq_puts(s, "Pinmux settings per pin\n"); | |
1069 | seq_puts(s, "Format: pin (name): pinmuxfunction\n"); | |
1070 | ||
706e8520 CP |
1071 | /* The pin number can be retrived from the pin controller descriptor */ |
1072 | for (i = 0; i < pctldev->desc->npins; i++) { | |
2744e8af LW |
1073 | |
1074 | struct pin_desc *desc; | |
1075 | ||
706e8520 | 1076 | pin = pctldev->desc->pins[i].number; |
2744e8af | 1077 | desc = pin_desc_get(pctldev, pin); |
706e8520 | 1078 | /* Skip if we cannot search the pin */ |
2744e8af LW |
1079 | if (desc == NULL) |
1080 | continue; | |
1081 | ||
1082 | seq_printf(s, "pin %d (%s): %s\n", pin, | |
1083 | desc->name ? desc->name : "unnamed", | |
5d2eaf80 SW |
1084 | desc->mux_function ? desc->mux_function |
1085 | : "UNCLAIMED"); | |
2744e8af LW |
1086 | } |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | static int pinmux_hogs_show(struct seq_file *s, void *what) | |
1092 | { | |
1093 | struct pinctrl_dev *pctldev = s->private; | |
1094 | struct pinmux_hog *hog; | |
1095 | ||
1096 | seq_puts(s, "Pinmux map hogs held by device\n"); | |
1097 | ||
1098 | list_for_each_entry(hog, &pctldev->pinmux_hogs, node) | |
1099 | seq_printf(s, "%s\n", hog->map->name); | |
1100 | ||
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | static int pinmux_show(struct seq_file *s, void *what) | |
1105 | { | |
1106 | struct pinmux *pmx; | |
1107 | ||
1108 | seq_puts(s, "Requested pinmuxes and their maps:\n"); | |
1109 | list_for_each_entry(pmx, &pinmux_list, node) { | |
1110 | struct pinctrl_dev *pctldev = pmx->pctldev; | |
1111 | const struct pinmux_ops *pmxops; | |
1112 | const struct pinctrl_ops *pctlops; | |
1113 | struct pinmux_group *grp; | |
1114 | ||
1115 | if (!pctldev) { | |
1116 | seq_puts(s, "NO PIN CONTROLLER DEVICE\n"); | |
1117 | continue; | |
1118 | } | |
1119 | ||
1120 | pmxops = pctldev->desc->pmxops; | |
1121 | pctlops = pctldev->desc->pctlops; | |
1122 | ||
1123 | seq_printf(s, "device: %s function: %s (%u),", | |
1124 | pinctrl_dev_get_name(pmx->pctldev), | |
1125 | pmxops->get_function_name(pctldev, pmx->func_selector), | |
1126 | pmx->func_selector); | |
1127 | ||
1128 | seq_printf(s, " groups: ["); | |
1129 | list_for_each_entry(grp, &pmx->groups, node) { | |
1130 | seq_printf(s, " %s (%u)", | |
1131 | pctlops->get_group_name(pctldev, grp->group_selector), | |
1132 | grp->group_selector); | |
1133 | } | |
1134 | seq_printf(s, " ]"); | |
1135 | ||
1136 | seq_printf(s, " users: %u map-> %s\n", | |
1137 | pmx->usecount, | |
1138 | pmx->dev ? dev_name(pmx->dev) : "(system)"); | |
1139 | } | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static int pinmux_maps_show(struct seq_file *s, void *what) | |
1145 | { | |
1146 | int i; | |
1147 | ||
1148 | seq_puts(s, "Pinmux maps:\n"); | |
1149 | ||
1150 | for (i = 0; i < pinmux_maps_num; i++) { | |
1151 | struct pinmux_map const *map = &pinmux_maps[i]; | |
1152 | ||
1153 | seq_printf(s, "%s:\n", map->name); | |
1154 | if (map->dev || map->dev_name) | |
1155 | seq_printf(s, " device: %s\n", | |
1156 | map->dev ? dev_name(map->dev) : | |
1157 | map->dev_name); | |
1158 | else | |
1159 | seq_printf(s, " SYSTEM MUX\n"); | |
1160 | seq_printf(s, " controlling device %s\n", | |
1161 | map->ctrl_dev ? dev_name(map->ctrl_dev) : | |
1162 | map->ctrl_dev_name); | |
1163 | seq_printf(s, " function: %s\n", map->function); | |
1164 | seq_printf(s, " group: %s\n", map->group ? map->group : | |
1165 | "(default)"); | |
1166 | } | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static int pinmux_functions_open(struct inode *inode, struct file *file) | |
1171 | { | |
1172 | return single_open(file, pinmux_functions_show, inode->i_private); | |
1173 | } | |
1174 | ||
1175 | static int pinmux_pins_open(struct inode *inode, struct file *file) | |
1176 | { | |
1177 | return single_open(file, pinmux_pins_show, inode->i_private); | |
1178 | } | |
1179 | ||
1180 | static int pinmux_hogs_open(struct inode *inode, struct file *file) | |
1181 | { | |
1182 | return single_open(file, pinmux_hogs_show, inode->i_private); | |
1183 | } | |
1184 | ||
1185 | static int pinmux_open(struct inode *inode, struct file *file) | |
1186 | { | |
1187 | return single_open(file, pinmux_show, NULL); | |
1188 | } | |
1189 | ||
1190 | static int pinmux_maps_open(struct inode *inode, struct file *file) | |
1191 | { | |
1192 | return single_open(file, pinmux_maps_show, NULL); | |
1193 | } | |
1194 | ||
1195 | static const struct file_operations pinmux_functions_ops = { | |
1196 | .open = pinmux_functions_open, | |
1197 | .read = seq_read, | |
1198 | .llseek = seq_lseek, | |
1199 | .release = single_release, | |
1200 | }; | |
1201 | ||
1202 | static const struct file_operations pinmux_pins_ops = { | |
1203 | .open = pinmux_pins_open, | |
1204 | .read = seq_read, | |
1205 | .llseek = seq_lseek, | |
1206 | .release = single_release, | |
1207 | }; | |
1208 | ||
1209 | static const struct file_operations pinmux_hogs_ops = { | |
1210 | .open = pinmux_hogs_open, | |
1211 | .read = seq_read, | |
1212 | .llseek = seq_lseek, | |
1213 | .release = single_release, | |
1214 | }; | |
1215 | ||
1216 | static const struct file_operations pinmux_ops = { | |
1217 | .open = pinmux_open, | |
1218 | .read = seq_read, | |
1219 | .llseek = seq_lseek, | |
1220 | .release = single_release, | |
1221 | }; | |
1222 | ||
1223 | static const struct file_operations pinmux_maps_ops = { | |
1224 | .open = pinmux_maps_open, | |
1225 | .read = seq_read, | |
1226 | .llseek = seq_lseek, | |
1227 | .release = single_release, | |
1228 | }; | |
1229 | ||
1230 | void pinmux_init_device_debugfs(struct dentry *devroot, | |
1231 | struct pinctrl_dev *pctldev) | |
1232 | { | |
1233 | debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO, | |
1234 | devroot, pctldev, &pinmux_functions_ops); | |
1235 | debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO, | |
1236 | devroot, pctldev, &pinmux_pins_ops); | |
1237 | debugfs_create_file("pinmux-hogs", S_IFREG | S_IRUGO, | |
1238 | devroot, pctldev, &pinmux_hogs_ops); | |
1239 | } | |
1240 | ||
1241 | void pinmux_init_debugfs(struct dentry *subsys_root) | |
1242 | { | |
1243 | debugfs_create_file("pinmuxes", S_IFREG | S_IRUGO, | |
1244 | subsys_root, NULL, &pinmux_ops); | |
1245 | debugfs_create_file("pinmux-maps", S_IFREG | S_IRUGO, | |
1246 | subsys_root, NULL, &pinmux_maps_ops); | |
1247 | } | |
1248 | ||
1249 | #endif /* CONFIG_DEBUG_FS */ |