Commit | Line | Data |
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2744e8af LW |
1 | /* |
2 | * Core driver for 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) "pinctrl core: " fmt | |
13 | ||
14 | #include <linux/kernel.h> | |
a5a697cd | 15 | #include <linux/export.h> |
2744e8af LW |
16 | #include <linux/init.h> |
17 | #include <linux/device.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/radix-tree.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/sysfs.h> | |
25 | #include <linux/debugfs.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/pinctrl/pinctrl.h> | |
28 | #include <linux/pinctrl/machine.h> | |
29 | #include "core.h" | |
30 | #include "pinmux.h" | |
ae6b4d85 | 31 | #include "pinconf.h" |
2744e8af LW |
32 | |
33 | /* Global list of pin control devices */ | |
34 | static DEFINE_MUTEX(pinctrldev_list_mutex); | |
35 | static LIST_HEAD(pinctrldev_list); | |
36 | ||
2744e8af LW |
37 | const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) |
38 | { | |
39 | /* We're not allowed to register devices without name */ | |
40 | return pctldev->desc->name; | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); | |
43 | ||
44 | void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) | |
45 | { | |
46 | return pctldev->driver_data; | |
47 | } | |
48 | EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); | |
49 | ||
50 | /** | |
51 | * get_pinctrl_dev_from_dev() - look up pin controller device | |
52 | * @dev: a device pointer, this may be NULL but then devname needs to be | |
53 | * defined instead | |
54 | * @devname: the name of a device instance, as returned by dev_name(), this | |
55 | * may be NULL but then dev needs to be defined instead | |
56 | * | |
57 | * Looks up a pin control device matching a certain device name or pure device | |
58 | * pointer, the pure device pointer will take precedence. | |
59 | */ | |
60 | struct pinctrl_dev *get_pinctrl_dev_from_dev(struct device *dev, | |
61 | const char *devname) | |
62 | { | |
63 | struct pinctrl_dev *pctldev = NULL; | |
64 | bool found = false; | |
65 | ||
66 | mutex_lock(&pinctrldev_list_mutex); | |
67 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
51cd24ee | 68 | if (dev && pctldev->dev == dev) { |
2744e8af LW |
69 | /* Matched on device pointer */ |
70 | found = true; | |
71 | break; | |
72 | } | |
73 | ||
74 | if (devname && | |
51cd24ee | 75 | !strcmp(dev_name(pctldev->dev), devname)) { |
2744e8af LW |
76 | /* Matched on device name */ |
77 | found = true; | |
78 | break; | |
79 | } | |
80 | } | |
81 | mutex_unlock(&pinctrldev_list_mutex); | |
82 | ||
83 | return found ? pctldev : NULL; | |
84 | } | |
85 | ||
33d58949 | 86 | struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, unsigned int pin) |
2744e8af LW |
87 | { |
88 | struct pin_desc *pindesc; | |
89 | unsigned long flags; | |
90 | ||
91 | spin_lock_irqsave(&pctldev->pin_desc_tree_lock, flags); | |
92 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, pin); | |
93 | spin_unlock_irqrestore(&pctldev->pin_desc_tree_lock, flags); | |
94 | ||
95 | return pindesc; | |
96 | } | |
97 | ||
ae6b4d85 LW |
98 | /** |
99 | * pin_get_from_name() - look up a pin number from a name | |
100 | * @pctldev: the pin control device to lookup the pin on | |
101 | * @name: the name of the pin to look up | |
102 | */ | |
103 | int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) | |
104 | { | |
105 | unsigned pin; | |
106 | ||
107 | /* The highest pin number need to be included in the loop, thus <= */ | |
108 | for (pin = 0; pin <= pctldev->desc->maxpin; pin++) { | |
109 | struct pin_desc *desc; | |
110 | ||
111 | desc = pin_desc_get(pctldev, pin); | |
112 | /* Pin space may be sparse */ | |
113 | if (desc == NULL) | |
114 | continue; | |
115 | if (desc->name && !strcmp(name, desc->name)) | |
116 | return pin; | |
117 | } | |
118 | ||
119 | return -EINVAL; | |
120 | } | |
121 | ||
2744e8af LW |
122 | /** |
123 | * pin_is_valid() - check if pin exists on controller | |
124 | * @pctldev: the pin control device to check the pin on | |
125 | * @pin: pin to check, use the local pin controller index number | |
126 | * | |
127 | * This tells us whether a certain pin exist on a certain pin controller or | |
128 | * not. Pin lists may be sparse, so some pins may not exist. | |
129 | */ | |
130 | bool pin_is_valid(struct pinctrl_dev *pctldev, int pin) | |
131 | { | |
132 | struct pin_desc *pindesc; | |
133 | ||
134 | if (pin < 0) | |
135 | return false; | |
136 | ||
137 | pindesc = pin_desc_get(pctldev, pin); | |
138 | if (pindesc == NULL) | |
139 | return false; | |
140 | ||
141 | return true; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(pin_is_valid); | |
144 | ||
145 | /* Deletes a range of pin descriptors */ | |
146 | static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, | |
147 | const struct pinctrl_pin_desc *pins, | |
148 | unsigned num_pins) | |
149 | { | |
150 | int i; | |
151 | ||
152 | spin_lock(&pctldev->pin_desc_tree_lock); | |
153 | for (i = 0; i < num_pins; i++) { | |
154 | struct pin_desc *pindesc; | |
155 | ||
156 | pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, | |
157 | pins[i].number); | |
158 | if (pindesc != NULL) { | |
159 | radix_tree_delete(&pctldev->pin_desc_tree, | |
160 | pins[i].number); | |
ca53c5f1 LW |
161 | if (pindesc->dynamic_name) |
162 | kfree(pindesc->name); | |
2744e8af LW |
163 | } |
164 | kfree(pindesc); | |
165 | } | |
166 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
167 | } | |
168 | ||
169 | static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, | |
170 | unsigned number, const char *name) | |
171 | { | |
172 | struct pin_desc *pindesc; | |
173 | ||
174 | pindesc = pin_desc_get(pctldev, number); | |
175 | if (pindesc != NULL) { | |
176 | pr_err("pin %d already registered on %s\n", number, | |
177 | pctldev->desc->name); | |
178 | return -EINVAL; | |
179 | } | |
180 | ||
181 | pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); | |
182 | if (pindesc == NULL) | |
183 | return -ENOMEM; | |
ae6b4d85 | 184 | |
2744e8af LW |
185 | spin_lock_init(&pindesc->lock); |
186 | ||
187 | /* Set owner */ | |
188 | pindesc->pctldev = pctldev; | |
189 | ||
9af1e44f | 190 | /* Copy basic pin info */ |
ca53c5f1 LW |
191 | if (pindesc->name) { |
192 | pindesc->name = name; | |
193 | } else { | |
194 | pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number); | |
195 | if (pindesc->name == NULL) | |
196 | return -ENOMEM; | |
197 | pindesc->dynamic_name = true; | |
198 | } | |
2744e8af LW |
199 | |
200 | spin_lock(&pctldev->pin_desc_tree_lock); | |
201 | radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc); | |
202 | spin_unlock(&pctldev->pin_desc_tree_lock); | |
203 | pr_debug("registered pin %d (%s) on %s\n", | |
ca53c5f1 | 204 | number, pindesc->name, pctldev->desc->name); |
2744e8af LW |
205 | return 0; |
206 | } | |
207 | ||
208 | static int pinctrl_register_pins(struct pinctrl_dev *pctldev, | |
209 | struct pinctrl_pin_desc const *pins, | |
210 | unsigned num_descs) | |
211 | { | |
212 | unsigned i; | |
213 | int ret = 0; | |
214 | ||
215 | for (i = 0; i < num_descs; i++) { | |
216 | ret = pinctrl_register_one_pin(pctldev, | |
217 | pins[i].number, pins[i].name); | |
218 | if (ret) | |
219 | return ret; | |
220 | } | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | /** | |
226 | * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range | |
227 | * @pctldev: pin controller device to check | |
228 | * @gpio: gpio pin to check taken from the global GPIO pin space | |
229 | * | |
230 | * Tries to match a GPIO pin number to the ranges handled by a certain pin | |
231 | * controller, return the range or NULL | |
232 | */ | |
233 | static struct pinctrl_gpio_range * | |
234 | pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) | |
235 | { | |
236 | struct pinctrl_gpio_range *range = NULL; | |
237 | ||
238 | /* Loop over the ranges */ | |
239 | mutex_lock(&pctldev->gpio_ranges_lock); | |
240 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
241 | /* Check if we're in the valid range */ | |
242 | if (gpio >= range->base && | |
243 | gpio < range->base + range->npins) { | |
244 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
245 | return range; | |
246 | } | |
247 | } | |
248 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
249 | ||
250 | return NULL; | |
251 | } | |
252 | ||
253 | /** | |
254 | * pinctrl_get_device_gpio_range() - find device for GPIO range | |
255 | * @gpio: the pin to locate the pin controller for | |
256 | * @outdev: the pin control device if found | |
257 | * @outrange: the GPIO range if found | |
258 | * | |
259 | * Find the pin controller handling a certain GPIO pin from the pinspace of | |
260 | * the GPIO subsystem, return the device and the matching GPIO range. Returns | |
261 | * negative if the GPIO range could not be found in any device. | |
262 | */ | |
263 | int pinctrl_get_device_gpio_range(unsigned gpio, | |
264 | struct pinctrl_dev **outdev, | |
265 | struct pinctrl_gpio_range **outrange) | |
266 | { | |
267 | struct pinctrl_dev *pctldev = NULL; | |
268 | ||
269 | /* Loop over the pin controllers */ | |
270 | mutex_lock(&pinctrldev_list_mutex); | |
271 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
272 | struct pinctrl_gpio_range *range; | |
273 | ||
274 | range = pinctrl_match_gpio_range(pctldev, gpio); | |
275 | if (range != NULL) { | |
276 | *outdev = pctldev; | |
277 | *outrange = range; | |
278 | mutex_unlock(&pinctrldev_list_mutex); | |
279 | return 0; | |
280 | } | |
281 | } | |
282 | mutex_unlock(&pinctrldev_list_mutex); | |
283 | ||
284 | return -EINVAL; | |
285 | } | |
286 | ||
287 | /** | |
288 | * pinctrl_add_gpio_range() - register a GPIO range for a controller | |
289 | * @pctldev: pin controller device to add the range to | |
290 | * @range: the GPIO range to add | |
291 | * | |
292 | * This adds a range of GPIOs to be handled by a certain pin controller. Call | |
293 | * this to register handled ranges after registering your pin controller. | |
294 | */ | |
295 | void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, | |
296 | struct pinctrl_gpio_range *range) | |
297 | { | |
298 | mutex_lock(&pctldev->gpio_ranges_lock); | |
299 | list_add(&range->node, &pctldev->gpio_ranges); | |
300 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
301 | } | |
302 | ||
303 | /** | |
304 | * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller | |
305 | * @pctldev: pin controller device to remove the range from | |
306 | * @range: the GPIO range to remove | |
307 | */ | |
308 | void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, | |
309 | struct pinctrl_gpio_range *range) | |
310 | { | |
311 | mutex_lock(&pctldev->gpio_ranges_lock); | |
312 | list_del(&range->node); | |
313 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
314 | } | |
315 | ||
7afde8ba LW |
316 | /** |
317 | * pinctrl_get_group_selector() - returns the group selector for a group | |
318 | * @pctldev: the pin controller handling the group | |
319 | * @pin_group: the pin group to look up | |
320 | */ | |
321 | int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, | |
322 | const char *pin_group) | |
323 | { | |
324 | const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; | |
325 | unsigned group_selector = 0; | |
326 | ||
327 | while (pctlops->list_groups(pctldev, group_selector) >= 0) { | |
328 | const char *gname = pctlops->get_group_name(pctldev, | |
329 | group_selector); | |
330 | if (!strcmp(gname, pin_group)) { | |
51cd24ee | 331 | dev_dbg(pctldev->dev, |
7afde8ba LW |
332 | "found group selector %u for %s\n", |
333 | group_selector, | |
334 | pin_group); | |
335 | return group_selector; | |
336 | } | |
337 | ||
338 | group_selector++; | |
339 | } | |
340 | ||
51cd24ee | 341 | dev_err(pctldev->dev, "does not have pin group %s\n", |
7afde8ba LW |
342 | pin_group); |
343 | ||
344 | return -EINVAL; | |
345 | } | |
346 | ||
2744e8af LW |
347 | #ifdef CONFIG_DEBUG_FS |
348 | ||
349 | static int pinctrl_pins_show(struct seq_file *s, void *what) | |
350 | { | |
351 | struct pinctrl_dev *pctldev = s->private; | |
352 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
353 | unsigned pin; | |
354 | ||
355 | seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); | |
356 | seq_printf(s, "max pin number: %d\n", pctldev->desc->maxpin); | |
357 | ||
358 | /* The highest pin number need to be included in the loop, thus <= */ | |
359 | for (pin = 0; pin <= pctldev->desc->maxpin; pin++) { | |
360 | struct pin_desc *desc; | |
361 | ||
362 | desc = pin_desc_get(pctldev, pin); | |
363 | /* Pin space may be sparse */ | |
364 | if (desc == NULL) | |
365 | continue; | |
366 | ||
367 | seq_printf(s, "pin %d (%s) ", pin, | |
368 | desc->name ? desc->name : "unnamed"); | |
369 | ||
370 | /* Driver-specific info per pin */ | |
371 | if (ops->pin_dbg_show) | |
372 | ops->pin_dbg_show(pctldev, s, pin); | |
373 | ||
374 | seq_puts(s, "\n"); | |
375 | } | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static int pinctrl_groups_show(struct seq_file *s, void *what) | |
381 | { | |
382 | struct pinctrl_dev *pctldev = s->private; | |
383 | const struct pinctrl_ops *ops = pctldev->desc->pctlops; | |
384 | unsigned selector = 0; | |
385 | ||
386 | /* No grouping */ | |
387 | if (!ops) | |
388 | return 0; | |
389 | ||
390 | seq_puts(s, "registered pin groups:\n"); | |
391 | while (ops->list_groups(pctldev, selector) >= 0) { | |
a5818a8b | 392 | const unsigned *pins; |
2744e8af LW |
393 | unsigned num_pins; |
394 | const char *gname = ops->get_group_name(pctldev, selector); | |
395 | int ret; | |
396 | int i; | |
397 | ||
398 | ret = ops->get_group_pins(pctldev, selector, | |
399 | &pins, &num_pins); | |
400 | if (ret) | |
401 | seq_printf(s, "%s [ERROR GETTING PINS]\n", | |
402 | gname); | |
403 | else { | |
404 | seq_printf(s, "group: %s, pins = [ ", gname); | |
405 | for (i = 0; i < num_pins; i++) | |
406 | seq_printf(s, "%d ", pins[i]); | |
407 | seq_puts(s, "]\n"); | |
408 | } | |
409 | selector++; | |
410 | } | |
411 | ||
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
416 | static int pinctrl_gpioranges_show(struct seq_file *s, void *what) | |
417 | { | |
418 | struct pinctrl_dev *pctldev = s->private; | |
419 | struct pinctrl_gpio_range *range = NULL; | |
420 | ||
421 | seq_puts(s, "GPIO ranges handled:\n"); | |
422 | ||
423 | /* Loop over the ranges */ | |
424 | mutex_lock(&pctldev->gpio_ranges_lock); | |
425 | list_for_each_entry(range, &pctldev->gpio_ranges, node) { | |
75d6642a LW |
426 | seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
427 | range->id, range->name, | |
428 | range->base, (range->base + range->npins - 1), | |
429 | range->pin_base, | |
430 | (range->pin_base + range->npins - 1)); | |
2744e8af LW |
431 | } |
432 | mutex_unlock(&pctldev->gpio_ranges_lock); | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | static int pinctrl_devices_show(struct seq_file *s, void *what) | |
438 | { | |
439 | struct pinctrl_dev *pctldev; | |
440 | ||
ae6b4d85 | 441 | seq_puts(s, "name [pinmux] [pinconf]\n"); |
2744e8af LW |
442 | mutex_lock(&pinctrldev_list_mutex); |
443 | list_for_each_entry(pctldev, &pinctrldev_list, node) { | |
444 | seq_printf(s, "%s ", pctldev->desc->name); | |
445 | if (pctldev->desc->pmxops) | |
ae6b4d85 LW |
446 | seq_puts(s, "yes "); |
447 | else | |
448 | seq_puts(s, "no "); | |
449 | if (pctldev->desc->confops) | |
2744e8af LW |
450 | seq_puts(s, "yes"); |
451 | else | |
452 | seq_puts(s, "no"); | |
453 | seq_puts(s, "\n"); | |
454 | } | |
455 | mutex_unlock(&pinctrldev_list_mutex); | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | static int pinctrl_pins_open(struct inode *inode, struct file *file) | |
461 | { | |
462 | return single_open(file, pinctrl_pins_show, inode->i_private); | |
463 | } | |
464 | ||
465 | static int pinctrl_groups_open(struct inode *inode, struct file *file) | |
466 | { | |
467 | return single_open(file, pinctrl_groups_show, inode->i_private); | |
468 | } | |
469 | ||
470 | static int pinctrl_gpioranges_open(struct inode *inode, struct file *file) | |
471 | { | |
472 | return single_open(file, pinctrl_gpioranges_show, inode->i_private); | |
473 | } | |
474 | ||
475 | static int pinctrl_devices_open(struct inode *inode, struct file *file) | |
476 | { | |
477 | return single_open(file, pinctrl_devices_show, NULL); | |
478 | } | |
479 | ||
480 | static const struct file_operations pinctrl_pins_ops = { | |
481 | .open = pinctrl_pins_open, | |
482 | .read = seq_read, | |
483 | .llseek = seq_lseek, | |
484 | .release = single_release, | |
485 | }; | |
486 | ||
487 | static const struct file_operations pinctrl_groups_ops = { | |
488 | .open = pinctrl_groups_open, | |
489 | .read = seq_read, | |
490 | .llseek = seq_lseek, | |
491 | .release = single_release, | |
492 | }; | |
493 | ||
494 | static const struct file_operations pinctrl_gpioranges_ops = { | |
495 | .open = pinctrl_gpioranges_open, | |
496 | .read = seq_read, | |
497 | .llseek = seq_lseek, | |
498 | .release = single_release, | |
499 | }; | |
500 | ||
501 | static const struct file_operations pinctrl_devices_ops = { | |
502 | .open = pinctrl_devices_open, | |
503 | .read = seq_read, | |
504 | .llseek = seq_lseek, | |
505 | .release = single_release, | |
506 | }; | |
507 | ||
508 | static struct dentry *debugfs_root; | |
509 | ||
510 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
511 | { | |
512 | static struct dentry *device_root; | |
513 | ||
51cd24ee | 514 | device_root = debugfs_create_dir(dev_name(pctldev->dev), |
2744e8af LW |
515 | debugfs_root); |
516 | if (IS_ERR(device_root) || !device_root) { | |
517 | pr_warn("failed to create debugfs directory for %s\n", | |
51cd24ee | 518 | dev_name(pctldev->dev)); |
2744e8af LW |
519 | return; |
520 | } | |
521 | debugfs_create_file("pins", S_IFREG | S_IRUGO, | |
522 | device_root, pctldev, &pinctrl_pins_ops); | |
523 | debugfs_create_file("pingroups", S_IFREG | S_IRUGO, | |
524 | device_root, pctldev, &pinctrl_groups_ops); | |
525 | debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, | |
526 | device_root, pctldev, &pinctrl_gpioranges_ops); | |
527 | pinmux_init_device_debugfs(device_root, pctldev); | |
ae6b4d85 | 528 | pinconf_init_device_debugfs(device_root, pctldev); |
2744e8af LW |
529 | } |
530 | ||
531 | static void pinctrl_init_debugfs(void) | |
532 | { | |
533 | debugfs_root = debugfs_create_dir("pinctrl", NULL); | |
534 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
535 | pr_warn("failed to create debugfs directory\n"); | |
536 | debugfs_root = NULL; | |
537 | return; | |
538 | } | |
539 | ||
540 | debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, | |
541 | debugfs_root, NULL, &pinctrl_devices_ops); | |
542 | pinmux_init_debugfs(debugfs_root); | |
543 | } | |
544 | ||
545 | #else /* CONFIG_DEBUG_FS */ | |
546 | ||
547 | static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) | |
548 | { | |
549 | } | |
550 | ||
551 | static void pinctrl_init_debugfs(void) | |
552 | { | |
553 | } | |
554 | ||
555 | #endif | |
556 | ||
557 | /** | |
558 | * pinctrl_register() - register a pin controller device | |
559 | * @pctldesc: descriptor for this pin controller | |
560 | * @dev: parent device for this pin controller | |
561 | * @driver_data: private pin controller data for this pin controller | |
562 | */ | |
563 | struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, | |
564 | struct device *dev, void *driver_data) | |
565 | { | |
2744e8af LW |
566 | struct pinctrl_dev *pctldev; |
567 | int ret; | |
568 | ||
569 | if (pctldesc == NULL) | |
570 | return NULL; | |
571 | if (pctldesc->name == NULL) | |
572 | return NULL; | |
573 | ||
574 | /* If we're implementing pinmuxing, check the ops for sanity */ | |
575 | if (pctldesc->pmxops) { | |
576 | ret = pinmux_check_ops(pctldesc->pmxops); | |
577 | if (ret) { | |
578 | pr_err("%s pinmux ops lacks necessary functions\n", | |
579 | pctldesc->name); | |
580 | return NULL; | |
581 | } | |
582 | } | |
583 | ||
ae6b4d85 LW |
584 | /* If we're implementing pinconfig, check the ops for sanity */ |
585 | if (pctldesc->confops) { | |
586 | ret = pinconf_check_ops(pctldesc->confops); | |
587 | if (ret) { | |
588 | pr_err("%s pin config ops lacks necessary functions\n", | |
589 | pctldesc->name); | |
590 | return NULL; | |
591 | } | |
592 | } | |
593 | ||
2744e8af LW |
594 | pctldev = kzalloc(sizeof(struct pinctrl_dev), GFP_KERNEL); |
595 | if (pctldev == NULL) | |
596 | return NULL; | |
597 | ||
598 | /* Initialize pin control device struct */ | |
599 | pctldev->owner = pctldesc->owner; | |
600 | pctldev->desc = pctldesc; | |
601 | pctldev->driver_data = driver_data; | |
602 | INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); | |
603 | spin_lock_init(&pctldev->pin_desc_tree_lock); | |
604 | INIT_LIST_HEAD(&pctldev->gpio_ranges); | |
605 | mutex_init(&pctldev->gpio_ranges_lock); | |
51cd24ee | 606 | pctldev->dev = dev; |
2744e8af LW |
607 | |
608 | /* Register all the pins */ | |
609 | pr_debug("try to register %d pins on %s...\n", | |
610 | pctldesc->npins, pctldesc->name); | |
611 | ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); | |
612 | if (ret) { | |
613 | pr_err("error during pin registration\n"); | |
614 | pinctrl_free_pindescs(pctldev, pctldesc->pins, | |
615 | pctldesc->npins); | |
51cd24ee | 616 | goto out_err; |
2744e8af LW |
617 | } |
618 | ||
619 | pinctrl_init_device_debugfs(pctldev); | |
620 | mutex_lock(&pinctrldev_list_mutex); | |
621 | list_add(&pctldev->node, &pinctrldev_list); | |
622 | mutex_unlock(&pinctrldev_list_mutex); | |
623 | pinmux_hog_maps(pctldev); | |
624 | return pctldev; | |
625 | ||
51cd24ee SW |
626 | out_err: |
627 | kfree(pctldev); | |
2744e8af LW |
628 | return NULL; |
629 | } | |
630 | EXPORT_SYMBOL_GPL(pinctrl_register); | |
631 | ||
632 | /** | |
633 | * pinctrl_unregister() - unregister pinmux | |
634 | * @pctldev: pin controller to unregister | |
635 | * | |
636 | * Called by pinmux drivers to unregister a pinmux. | |
637 | */ | |
638 | void pinctrl_unregister(struct pinctrl_dev *pctldev) | |
639 | { | |
640 | if (pctldev == NULL) | |
641 | return; | |
642 | ||
643 | pinmux_unhog_maps(pctldev); | |
644 | /* TODO: check that no pinmuxes are still active? */ | |
645 | mutex_lock(&pinctrldev_list_mutex); | |
646 | list_del(&pctldev->node); | |
647 | mutex_unlock(&pinctrldev_list_mutex); | |
648 | /* Destroy descriptor tree */ | |
649 | pinctrl_free_pindescs(pctldev, pctldev->desc->pins, | |
650 | pctldev->desc->npins); | |
51cd24ee | 651 | kfree(pctldev); |
2744e8af LW |
652 | } |
653 | EXPORT_SYMBOL_GPL(pinctrl_unregister); | |
654 | ||
655 | static int __init pinctrl_init(void) | |
656 | { | |
657 | pr_info("initialized pinctrl subsystem\n"); | |
658 | pinctrl_init_debugfs(); | |
659 | return 0; | |
660 | } | |
661 | ||
662 | /* init early since many drivers really need to initialized pinmux early */ | |
663 | core_initcall(pinctrl_init); |