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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 | * | |
e93bcee0 | 4 | * Copyright (C) 2011-2012 ST-Ericsson SA |
2744e8af LW |
5 | * Written on behalf of Linaro for ST-Ericsson |
6 | * Based on bits of regulator core, gpio core and clk core | |
7 | * | |
8 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
9 | * | |
10 | * License terms: GNU General Public License (GPL) version 2 | |
11 | */ | |
12 | #define pr_fmt(fmt) "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" | |
befe5bdf | 31 | #include "pinmux.h" |
2744e8af LW |
32 | |
33 | /** | |
34 | * struct pinmux_group - group list item for pinmux groups | |
35 | * @node: pinmux group list node | |
36 | * @group_selector: the group selector for this group | |
37 | */ | |
38 | struct pinmux_group { | |
39 | struct list_head node; | |
40 | unsigned group_selector; | |
41 | }; | |
42 | ||
2744e8af LW |
43 | /** |
44 | * pin_request() - request a single pin to be muxed in, typically for GPIO | |
45 | * @pin: the pin number in the global pin space | |
46 | * @function: a functional name to give to this pin, passed to the driver | |
47 | * so it knows what function to mux in, e.g. the string "gpioNN" | |
48 | * means that you want to mux in the pin for use as GPIO number NN | |
2744e8af LW |
49 | * @gpio_range: the range matching the GPIO pin if this is a request for a |
50 | * single GPIO pin | |
51 | */ | |
52 | static int pin_request(struct pinctrl_dev *pctldev, | |
3712a3c4 | 53 | int pin, const char *function, |
2744e8af LW |
54 | struct pinctrl_gpio_range *gpio_range) |
55 | { | |
56 | struct pin_desc *desc; | |
57 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
58 | int status = -EINVAL; | |
59 | ||
51cd24ee | 60 | dev_dbg(pctldev->dev, "request pin %d for %s\n", pin, function); |
2744e8af | 61 | |
2744e8af LW |
62 | desc = pin_desc_get(pctldev, pin); |
63 | if (desc == NULL) { | |
51cd24ee | 64 | dev_err(pctldev->dev, |
2744e8af LW |
65 | "pin is not registered so it cannot be requested\n"); |
66 | goto out; | |
67 | } | |
68 | ||
d2f6a1c6 | 69 | if (!function) { |
51cd24ee | 70 | dev_err(pctldev->dev, "no function name given\n"); |
d2f6a1c6 MB |
71 | return -EINVAL; |
72 | } | |
73 | ||
2744e8af | 74 | spin_lock(&desc->lock); |
5d2eaf80 | 75 | if (desc->mux_function) { |
2744e8af | 76 | spin_unlock(&desc->lock); |
51cd24ee | 77 | dev_err(pctldev->dev, |
2744e8af LW |
78 | "pin already requested\n"); |
79 | goto out; | |
80 | } | |
5d2eaf80 | 81 | desc->mux_function = function; |
2744e8af LW |
82 | spin_unlock(&desc->lock); |
83 | ||
84 | /* Let each pin increase references to this module */ | |
85 | if (!try_module_get(pctldev->owner)) { | |
51cd24ee | 86 | dev_err(pctldev->dev, |
2744e8af LW |
87 | "could not increase module refcount for pin %d\n", |
88 | pin); | |
89 | status = -EINVAL; | |
90 | goto out_free_pin; | |
91 | } | |
92 | ||
93 | /* | |
94 | * If there is no kind of request function for the pin we just assume | |
95 | * we got it by default and proceed. | |
96 | */ | |
3712a3c4 | 97 | if (gpio_range && ops->gpio_request_enable) |
2744e8af LW |
98 | /* This requests and enables a single GPIO pin */ |
99 | status = ops->gpio_request_enable(pctldev, gpio_range, pin); | |
100 | else if (ops->request) | |
101 | status = ops->request(pctldev, pin); | |
102 | else | |
103 | status = 0; | |
104 | ||
105 | if (status) | |
f9d41d7c | 106 | dev_err(pctldev->dev, "->request on device %s failed for pin %d\n", |
2744e8af LW |
107 | pctldev->desc->name, pin); |
108 | out_free_pin: | |
109 | if (status) { | |
110 | spin_lock(&desc->lock); | |
5d2eaf80 | 111 | desc->mux_function = NULL; |
2744e8af LW |
112 | spin_unlock(&desc->lock); |
113 | } | |
114 | out: | |
115 | if (status) | |
51cd24ee | 116 | dev_err(pctldev->dev, "pin-%d (%s) status %d\n", |
2744e8af LW |
117 | pin, function ? : "?", status); |
118 | ||
119 | return status; | |
120 | } | |
121 | ||
122 | /** | |
123 | * pin_free() - release a single muxed in pin so something else can be muxed | |
124 | * @pctldev: pin controller device handling this pin | |
125 | * @pin: the pin to free | |
3712a3c4 SW |
126 | * @gpio_range: the range matching the GPIO pin if this is a request for a |
127 | * single GPIO pin | |
336cdba0 LW |
128 | * |
129 | * This function returns a pointer to the function name in use. This is used | |
130 | * for callers that dynamically allocate a function name so it can be freed | |
131 | * once the pin is free. This is done for GPIO request functions. | |
2744e8af | 132 | */ |
3712a3c4 SW |
133 | static const char *pin_free(struct pinctrl_dev *pctldev, int pin, |
134 | struct pinctrl_gpio_range *gpio_range) | |
2744e8af LW |
135 | { |
136 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
137 | struct pin_desc *desc; | |
3712a3c4 | 138 | const char *func; |
2744e8af LW |
139 | |
140 | desc = pin_desc_get(pctldev, pin); | |
141 | if (desc == NULL) { | |
51cd24ee | 142 | dev_err(pctldev->dev, |
2744e8af | 143 | "pin is not registered so it cannot be freed\n"); |
3712a3c4 | 144 | return NULL; |
2744e8af LW |
145 | } |
146 | ||
3712a3c4 SW |
147 | /* |
148 | * If there is no kind of request function for the pin we just assume | |
149 | * we got it by default and proceed. | |
150 | */ | |
151 | if (gpio_range && ops->gpio_disable_free) | |
152 | ops->gpio_disable_free(pctldev, gpio_range, pin); | |
153 | else if (ops->free) | |
2744e8af LW |
154 | ops->free(pctldev, pin); |
155 | ||
156 | spin_lock(&desc->lock); | |
3712a3c4 | 157 | func = desc->mux_function; |
5d2eaf80 | 158 | desc->mux_function = NULL; |
2744e8af LW |
159 | spin_unlock(&desc->lock); |
160 | module_put(pctldev->owner); | |
3712a3c4 SW |
161 | |
162 | return func; | |
2744e8af LW |
163 | } |
164 | ||
165 | /** | |
befe5bdf LW |
166 | * pinmux_request_gpio() - request pinmuxing for a GPIO pin |
167 | * @pctldev: pin controller device affected | |
168 | * @pin: the pin to mux in for GPIO | |
169 | * @range: the applicable GPIO range | |
2744e8af | 170 | */ |
befe5bdf LW |
171 | int pinmux_request_gpio(struct pinctrl_dev *pctldev, |
172 | struct pinctrl_gpio_range *range, | |
173 | unsigned pin, unsigned gpio) | |
2744e8af LW |
174 | { |
175 | char gpiostr[16]; | |
5d2eaf80 | 176 | const char *function; |
2744e8af | 177 | int ret; |
2744e8af LW |
178 | |
179 | /* Conjure some name stating what chip and pin this is taken by */ | |
180 | snprintf(gpiostr, 15, "%s:%d", range->name, gpio); | |
181 | ||
5d2eaf80 SW |
182 | function = kstrdup(gpiostr, GFP_KERNEL); |
183 | if (!function) | |
184 | return -EINVAL; | |
185 | ||
3712a3c4 | 186 | ret = pin_request(pctldev, pin, function, range); |
5d2eaf80 SW |
187 | if (ret < 0) |
188 | kfree(function); | |
189 | ||
190 | return ret; | |
2744e8af | 191 | } |
2744e8af LW |
192 | |
193 | /** | |
befe5bdf LW |
194 | * pinmux_free_gpio() - release a pin from GPIO muxing |
195 | * @pctldev: the pin controller device for the pin | |
196 | * @pin: the affected currently GPIO-muxed in pin | |
197 | * @range: applicable GPIO range | |
2744e8af | 198 | */ |
befe5bdf LW |
199 | void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin, |
200 | struct pinctrl_gpio_range *range) | |
2744e8af | 201 | { |
3712a3c4 | 202 | const char *func; |
2744e8af | 203 | |
3712a3c4 SW |
204 | func = pin_free(pctldev, pin, range); |
205 | kfree(func); | |
2744e8af | 206 | } |
2744e8af | 207 | |
befe5bdf LW |
208 | /** |
209 | * pinmux_gpio_direction() - set the direction of a single muxed-in GPIO pin | |
210 | * @pctldev: the pin controller handling this pin | |
211 | * @range: applicable GPIO range | |
212 | * @pin: the affected GPIO pin in this controller | |
213 | * @input: true if we set the pin as input, false for output | |
214 | */ | |
215 | int pinmux_gpio_direction(struct pinctrl_dev *pctldev, | |
216 | struct pinctrl_gpio_range *range, | |
217 | unsigned pin, bool input) | |
542e704f | 218 | { |
542e704f LW |
219 | const struct pinmux_ops *ops; |
220 | int ret; | |
542e704f LW |
221 | |
222 | ops = pctldev->desc->pmxops; | |
223 | ||
542e704f LW |
224 | if (ops->gpio_set_direction) |
225 | ret = ops->gpio_set_direction(pctldev, range, pin, input); | |
226 | else | |
227 | ret = 0; | |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
2744e8af | 232 | /** |
de849eec | 233 | * acquire_pins() - acquire all the pins for a certain function on a pinmux |
2744e8af LW |
234 | * @pctldev: the device to take the pins on |
235 | * @func_selector: the function selector to acquire the pins for | |
236 | * @group_selector: the group selector containing the pins to acquire | |
237 | */ | |
238 | static int acquire_pins(struct pinctrl_dev *pctldev, | |
239 | unsigned func_selector, | |
240 | unsigned group_selector) | |
241 | { | |
242 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
243 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; | |
244 | const char *func = pmxops->get_function_name(pctldev, | |
245 | func_selector); | |
a5818a8b | 246 | const unsigned *pins; |
2744e8af LW |
247 | unsigned num_pins; |
248 | int ret; | |
249 | int i; | |
250 | ||
251 | ret = pctlops->get_group_pins(pctldev, group_selector, | |
252 | &pins, &num_pins); | |
253 | if (ret) | |
254 | return ret; | |
255 | ||
51cd24ee | 256 | dev_dbg(pctldev->dev, "requesting the %u pins from group %u\n", |
2744e8af LW |
257 | num_pins, group_selector); |
258 | ||
259 | /* Try to allocate all pins in this group, one by one */ | |
260 | for (i = 0; i < num_pins; i++) { | |
3712a3c4 | 261 | ret = pin_request(pctldev, pins[i], func, NULL); |
2744e8af | 262 | if (ret) { |
51cd24ee | 263 | dev_err(pctldev->dev, |
f9d41d7c | 264 | "could not get pin %d for function %s on device %s - conflicting mux mappings?\n", |
2744e8af LW |
265 | pins[i], func ? : "(undefined)", |
266 | pinctrl_dev_get_name(pctldev)); | |
267 | /* On error release all taken pins */ | |
268 | i--; /* this pin just failed */ | |
269 | for (; i >= 0; i--) | |
3712a3c4 | 270 | pin_free(pctldev, pins[i], NULL); |
2744e8af LW |
271 | return -ENODEV; |
272 | } | |
273 | } | |
274 | return 0; | |
275 | } | |
276 | ||
277 | /** | |
278 | * release_pins() - release pins taken by earlier acquirement | |
de849eec | 279 | * @pctldev: the device to free the pins on |
2744e8af LW |
280 | * @group_selector: the group selector containing the pins to free |
281 | */ | |
282 | static void release_pins(struct pinctrl_dev *pctldev, | |
283 | unsigned group_selector) | |
284 | { | |
285 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
a5818a8b | 286 | const unsigned *pins; |
2744e8af LW |
287 | unsigned num_pins; |
288 | int ret; | |
289 | int i; | |
290 | ||
291 | ret = pctlops->get_group_pins(pctldev, group_selector, | |
292 | &pins, &num_pins); | |
293 | if (ret) { | |
f9d41d7c | 294 | dev_err(pctldev->dev, "could not get pins to release for group selector %d\n", |
2744e8af LW |
295 | group_selector); |
296 | return; | |
297 | } | |
298 | for (i = 0; i < num_pins; i++) | |
3712a3c4 | 299 | pin_free(pctldev, pins[i], NULL); |
2744e8af LW |
300 | } |
301 | ||
2744e8af LW |
302 | /** |
303 | * pinmux_check_pin_group() - check function and pin group combo | |
304 | * @pctldev: device to check the pin group vs function for | |
305 | * @func_selector: the function selector to check the pin group for, we have | |
306 | * already looked this up in the calling function | |
307 | * @pin_group: the pin group to match to the function | |
308 | * | |
309 | * This function will check that the pinmux driver can supply the | |
310 | * selected pin group for a certain function, returns the group selector if | |
311 | * the group and function selector will work fine together, else returns | |
312 | * negative | |
313 | */ | |
314 | static int pinmux_check_pin_group(struct pinctrl_dev *pctldev, | |
315 | unsigned func_selector, | |
316 | const char *pin_group) | |
317 | { | |
318 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; | |
319 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
320 | int ret; | |
321 | ||
322 | /* | |
323 | * If the driver does not support different pin groups for the | |
324 | * functions, we only support group 0, and assume this exists. | |
325 | */ | |
326 | if (!pctlops || !pctlops->list_groups) | |
327 | return 0; | |
328 | ||
329 | /* | |
330 | * Passing NULL (no specific group) will select the first and | |
331 | * hopefully only group of pins available for this function. | |
332 | */ | |
333 | if (!pin_group) { | |
334 | char const * const *groups; | |
335 | unsigned num_groups; | |
336 | ||
337 | ret = pmxops->get_function_groups(pctldev, func_selector, | |
338 | &groups, &num_groups); | |
339 | if (ret) | |
340 | return ret; | |
341 | if (num_groups < 1) | |
342 | return -EINVAL; | |
7afde8ba | 343 | ret = pinctrl_get_group_selector(pctldev, groups[0]); |
2744e8af | 344 | if (ret < 0) { |
51cd24ee | 345 | dev_err(pctldev->dev, |
f9d41d7c | 346 | "function %s wants group %s but the pin controller does not seem to have that group\n", |
2744e8af LW |
347 | pmxops->get_function_name(pctldev, func_selector), |
348 | groups[0]); | |
349 | return ret; | |
350 | } | |
351 | ||
352 | if (num_groups > 1) | |
51cd24ee | 353 | dev_dbg(pctldev->dev, |
f9d41d7c | 354 | "function %s support more than one group, default-selecting first group %s (%d)\n", |
2744e8af LW |
355 | pmxops->get_function_name(pctldev, func_selector), |
356 | groups[0], | |
357 | ret); | |
358 | ||
359 | return ret; | |
360 | } | |
361 | ||
51cd24ee | 362 | dev_dbg(pctldev->dev, |
2744e8af LW |
363 | "check if we have pin group %s on controller %s\n", |
364 | pin_group, pinctrl_dev_get_name(pctldev)); | |
365 | ||
7afde8ba | 366 | ret = pinctrl_get_group_selector(pctldev, pin_group); |
2744e8af | 367 | if (ret < 0) { |
51cd24ee | 368 | dev_dbg(pctldev->dev, |
2744e8af LW |
369 | "%s does not support pin group %s with function %s\n", |
370 | pinctrl_dev_get_name(pctldev), | |
371 | pin_group, | |
372 | pmxops->get_function_name(pctldev, func_selector)); | |
373 | } | |
374 | return ret; | |
375 | } | |
376 | ||
377 | /** | |
378 | * pinmux_search_function() - check pin control driver for a certain function | |
379 | * @pctldev: device to check for function and position | |
380 | * @map: function map containing the function and position to look for | |
381 | * @func_selector: returns the applicable function selector if found | |
382 | * @group_selector: returns the applicable group selector if found | |
383 | * | |
384 | * This will search the pinmux driver for an applicable | |
385 | * function with a specific pin group, returns 0 if these can be mapped | |
386 | * negative otherwise | |
387 | */ | |
388 | static int pinmux_search_function(struct pinctrl_dev *pctldev, | |
e93bcee0 | 389 | struct pinctrl_map const *map, |
2744e8af LW |
390 | unsigned *func_selector, |
391 | unsigned *group_selector) | |
392 | { | |
393 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
394 | unsigned selector = 0; | |
395 | ||
396 | /* See if this pctldev has this function */ | |
397 | while (ops->list_functions(pctldev, selector) >= 0) { | |
398 | const char *fname = ops->get_function_name(pctldev, | |
399 | selector); | |
400 | int ret; | |
401 | ||
402 | if (!strcmp(map->function, fname)) { | |
403 | /* Found the function, check pin group */ | |
404 | ret = pinmux_check_pin_group(pctldev, selector, | |
405 | map->group); | |
406 | if (ret < 0) | |
407 | return ret; | |
408 | ||
409 | /* This function and group selector can be used */ | |
410 | *func_selector = selector; | |
411 | *group_selector = ret; | |
412 | return 0; | |
413 | ||
414 | } | |
415 | selector++; | |
416 | } | |
417 | ||
418 | pr_err("%s does not support function %s\n", | |
419 | pinctrl_dev_get_name(pctldev), map->function); | |
420 | return -EINVAL; | |
421 | } | |
422 | ||
423 | /** | |
424 | * pinmux_enable_muxmap() - enable a map entry for a certain pinmux | |
425 | */ | |
426 | static int pinmux_enable_muxmap(struct pinctrl_dev *pctldev, | |
e93bcee0 | 427 | struct pinctrl *p, |
2744e8af LW |
428 | struct device *dev, |
429 | const char *devname, | |
e93bcee0 | 430 | struct pinctrl_map const *map) |
2744e8af LW |
431 | { |
432 | unsigned func_selector; | |
433 | unsigned group_selector; | |
434 | struct pinmux_group *grp; | |
435 | int ret; | |
436 | ||
437 | /* | |
438 | * Note that we're not locking the pinmux mutex here, because | |
439 | * this is only called at pinmux initialization time when it | |
440 | * has not been added to any list and thus is not reachable | |
441 | * by anyone else. | |
442 | */ | |
443 | ||
e93bcee0 | 444 | if (p->pctldev && p->pctldev != pctldev) { |
51cd24ee | 445 | dev_err(pctldev->dev, |
f9d41d7c UKK |
446 | "different pin control devices given for device %s, function %s\n", |
447 | devname, map->function); | |
2744e8af LW |
448 | return -EINVAL; |
449 | } | |
e93bcee0 LW |
450 | p->dev = dev; |
451 | p->pctldev = pctldev; | |
2744e8af LW |
452 | |
453 | /* Now go into the driver and try to match a function and group */ | |
454 | ret = pinmux_search_function(pctldev, map, &func_selector, | |
455 | &group_selector); | |
456 | if (ret < 0) | |
457 | return ret; | |
458 | ||
459 | /* | |
460 | * If the function selector is already set, it needs to be identical, | |
461 | * we support several groups with one function but not several | |
462 | * functions with one or several groups in the same pinmux. | |
463 | */ | |
e93bcee0 LW |
464 | if (p->func_selector != UINT_MAX && |
465 | p->func_selector != func_selector) { | |
51cd24ee | 466 | dev_err(pctldev->dev, |
2744e8af LW |
467 | "dual function defines in the map for device %s\n", |
468 | devname); | |
469 | return -EINVAL; | |
470 | } | |
e93bcee0 | 471 | p->func_selector = func_selector; |
2744e8af LW |
472 | |
473 | /* Now add this group selector, we may have many of them */ | |
474 | grp = kmalloc(sizeof(struct pinmux_group), GFP_KERNEL); | |
475 | if (!grp) | |
476 | return -ENOMEM; | |
477 | grp->group_selector = group_selector; | |
478 | ret = acquire_pins(pctldev, func_selector, group_selector); | |
479 | if (ret) { | |
480 | kfree(grp); | |
481 | return ret; | |
482 | } | |
8b9c139f | 483 | list_add_tail(&grp->node, &p->groups); |
2744e8af LW |
484 | |
485 | return 0; | |
486 | } | |
487 | ||
2744e8af | 488 | /** |
befe5bdf | 489 | * pinmux_apply_muxmap() - apply a certain mux mapping entry |
2744e8af | 490 | */ |
befe5bdf LW |
491 | int pinmux_apply_muxmap(struct pinctrl_dev *pctldev, |
492 | struct pinctrl *p, | |
493 | struct device *dev, | |
494 | const char *devname, | |
495 | struct pinctrl_map const *map) | |
2744e8af | 496 | { |
befe5bdf | 497 | int ret; |
2744e8af | 498 | |
befe5bdf LW |
499 | ret = pinmux_enable_muxmap(pctldev, p, dev, |
500 | devname, map); | |
501 | if (ret) { | |
502 | pinmux_put(p); | |
503 | return ret; | |
2744e8af LW |
504 | } |
505 | ||
befe5bdf | 506 | return 0; |
2744e8af | 507 | } |
2744e8af LW |
508 | |
509 | /** | |
befe5bdf | 510 | * pinmux_put() - free up the pinmux portions of a pin controller handle |
2744e8af | 511 | */ |
befe5bdf | 512 | void pinmux_put(struct pinctrl *p) |
2744e8af | 513 | { |
befe5bdf | 514 | struct list_head *node, *tmp; |
2744e8af | 515 | |
befe5bdf LW |
516 | list_for_each_safe(node, tmp, &p->groups) { |
517 | struct pinmux_group *grp = | |
518 | list_entry(node, struct pinmux_group, node); | |
519 | /* Release all pins taken by this group */ | |
520 | release_pins(p->pctldev, grp->group_selector); | |
521 | list_del(node); | |
522 | kfree(grp); | |
523 | } | |
2744e8af | 524 | } |
2744e8af LW |
525 | |
526 | /** | |
befe5bdf | 527 | * pinmux_enable() - enable the pinmux portion of a pin control handle |
2744e8af | 528 | */ |
befe5bdf | 529 | int pinmux_enable(struct pinctrl *p) |
2744e8af | 530 | { |
befe5bdf LW |
531 | struct pinctrl_dev *pctldev = p->pctldev; |
532 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
533 | struct pinmux_group *grp; | |
534 | int ret; | |
2744e8af | 535 | |
befe5bdf LW |
536 | list_for_each_entry(grp, &p->groups, node) { |
537 | ret = ops->enable(pctldev, p->func_selector, | |
538 | grp->group_selector); | |
539 | if (ret) | |
540 | /* | |
541 | * TODO: call disable() on all groups we called | |
542 | * enable() on to this point? | |
543 | */ | |
544 | return ret; | |
2744e8af | 545 | } |
befe5bdf | 546 | return 0; |
2744e8af | 547 | } |
2744e8af LW |
548 | |
549 | /** | |
befe5bdf | 550 | * pinmux_disable() - disable the pinmux portions of a pin control handle |
2744e8af | 551 | */ |
befe5bdf | 552 | void pinmux_disable(struct pinctrl *p) |
2744e8af | 553 | { |
befe5bdf LW |
554 | struct pinctrl_dev *pctldev = p->pctldev; |
555 | const struct pinmux_ops *ops = pctldev->desc->pmxops; | |
556 | struct pinmux_group *grp; | |
2744e8af | 557 | |
befe5bdf LW |
558 | list_for_each_entry(grp, &p->groups, node) { |
559 | ops->disable(pctldev, p->func_selector, | |
560 | grp->group_selector); | |
2744e8af | 561 | } |
2744e8af | 562 | } |
2744e8af | 563 | |
b9130b77 | 564 | int pinmux_check_ops(struct pinctrl_dev *pctldev) |
2744e8af | 565 | { |
b9130b77 TL |
566 | const struct pinmux_ops *ops = pctldev->desc->pmxops; |
567 | unsigned selector = 0; | |
568 | ||
2744e8af LW |
569 | /* Check that we implement required operations */ |
570 | if (!ops->list_functions || | |
571 | !ops->get_function_name || | |
572 | !ops->get_function_groups || | |
573 | !ops->enable || | |
574 | !ops->disable) | |
575 | return -EINVAL; | |
576 | ||
b9130b77 TL |
577 | /* Check that all functions registered have names */ |
578 | while (ops->list_functions(pctldev, selector) >= 0) { | |
579 | const char *fname = ops->get_function_name(pctldev, | |
580 | selector); | |
581 | if (!fname) { | |
582 | pr_err("pinmux ops has no name for function%u\n", | |
583 | selector); | |
584 | return -EINVAL; | |
585 | } | |
586 | selector++; | |
587 | } | |
588 | ||
2744e8af LW |
589 | return 0; |
590 | } | |
591 | ||
2744e8af LW |
592 | #ifdef CONFIG_DEBUG_FS |
593 | ||
594 | /* Called from pincontrol core */ | |
595 | static int pinmux_functions_show(struct seq_file *s, void *what) | |
596 | { | |
597 | struct pinctrl_dev *pctldev = s->private; | |
598 | const struct pinmux_ops *pmxops = pctldev->desc->pmxops; | |
599 | unsigned func_selector = 0; | |
600 | ||
601 | while (pmxops->list_functions(pctldev, func_selector) >= 0) { | |
602 | const char *func = pmxops->get_function_name(pctldev, | |
603 | func_selector); | |
604 | const char * const *groups; | |
605 | unsigned num_groups; | |
606 | int ret; | |
607 | int i; | |
608 | ||
609 | ret = pmxops->get_function_groups(pctldev, func_selector, | |
610 | &groups, &num_groups); | |
611 | if (ret) | |
612 | seq_printf(s, "function %s: COULD NOT GET GROUPS\n", | |
613 | func); | |
614 | ||
615 | seq_printf(s, "function: %s, groups = [ ", func); | |
616 | for (i = 0; i < num_groups; i++) | |
617 | seq_printf(s, "%s ", groups[i]); | |
618 | seq_puts(s, "]\n"); | |
619 | ||
620 | func_selector++; | |
621 | ||
622 | } | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
627 | static int pinmux_pins_show(struct seq_file *s, void *what) | |
628 | { | |
629 | struct pinctrl_dev *pctldev = s->private; | |
706e8520 | 630 | unsigned i, pin; |
2744e8af LW |
631 | |
632 | seq_puts(s, "Pinmux settings per pin\n"); | |
633 | seq_puts(s, "Format: pin (name): pinmuxfunction\n"); | |
634 | ||
706e8520 CP |
635 | /* The pin number can be retrived from the pin controller descriptor */ |
636 | for (i = 0; i < pctldev->desc->npins; i++) { | |
2744e8af LW |
637 | |
638 | struct pin_desc *desc; | |
639 | ||
706e8520 | 640 | pin = pctldev->desc->pins[i].number; |
2744e8af | 641 | desc = pin_desc_get(pctldev, pin); |
706e8520 | 642 | /* Skip if we cannot search the pin */ |
2744e8af LW |
643 | if (desc == NULL) |
644 | continue; | |
645 | ||
646 | seq_printf(s, "pin %d (%s): %s\n", pin, | |
647 | desc->name ? desc->name : "unnamed", | |
5d2eaf80 SW |
648 | desc->mux_function ? desc->mux_function |
649 | : "UNCLAIMED"); | |
2744e8af LW |
650 | } |
651 | ||
652 | return 0; | |
653 | } | |
654 | ||
befe5bdf | 655 | void pinmux_dbg_show(struct seq_file *s, struct pinctrl *p) |
2744e8af | 656 | { |
befe5bdf LW |
657 | struct pinctrl_dev *pctldev = p->pctldev; |
658 | const struct pinmux_ops *pmxops; | |
659 | const struct pinctrl_ops *pctlops; | |
660 | struct pinmux_group *grp; | |
2744e8af | 661 | |
befe5bdf LW |
662 | pmxops = pctldev->desc->pmxops; |
663 | pctlops = pctldev->desc->pctlops; | |
2744e8af | 664 | |
befe5bdf LW |
665 | seq_printf(s, " function: %s (%u),", |
666 | pmxops->get_function_name(pctldev, | |
667 | p->func_selector), | |
668 | p->func_selector); | |
2744e8af | 669 | |
befe5bdf LW |
670 | seq_printf(s, " groups: ["); |
671 | list_for_each_entry(grp, &p->groups, node) { | |
672 | seq_printf(s, " %s (%u)", | |
673 | pctlops->get_group_name(pctldev, | |
674 | grp->group_selector), | |
675 | grp->group_selector); | |
2744e8af | 676 | } |
befe5bdf | 677 | seq_printf(s, " ]"); |
2744e8af LW |
678 | } |
679 | ||
680 | static int pinmux_functions_open(struct inode *inode, struct file *file) | |
681 | { | |
682 | return single_open(file, pinmux_functions_show, inode->i_private); | |
683 | } | |
684 | ||
685 | static int pinmux_pins_open(struct inode *inode, struct file *file) | |
686 | { | |
687 | return single_open(file, pinmux_pins_show, inode->i_private); | |
688 | } | |
689 | ||
2744e8af LW |
690 | static const struct file_operations pinmux_functions_ops = { |
691 | .open = pinmux_functions_open, | |
692 | .read = seq_read, | |
693 | .llseek = seq_lseek, | |
694 | .release = single_release, | |
695 | }; | |
696 | ||
697 | static const struct file_operations pinmux_pins_ops = { | |
698 | .open = pinmux_pins_open, | |
699 | .read = seq_read, | |
700 | .llseek = seq_lseek, | |
701 | .release = single_release, | |
702 | }; | |
703 | ||
2744e8af LW |
704 | void pinmux_init_device_debugfs(struct dentry *devroot, |
705 | struct pinctrl_dev *pctldev) | |
706 | { | |
707 | debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO, | |
708 | devroot, pctldev, &pinmux_functions_ops); | |
709 | debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO, | |
710 | devroot, pctldev, &pinmux_pins_ops); | |
2744e8af LW |
711 | } |
712 | ||
713 | #endif /* CONFIG_DEBUG_FS */ |