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de55d871 MH |
1 | /* |
2 | * drivers/extcon/extcon_class.c | |
3 | * | |
4 | * External connector (extcon) class driver | |
5 | * | |
6 | * Copyright (C) 2012 Samsung Electronics | |
7 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
8 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
9 | * | |
10 | * based on android/drivers/switch/switch_class.c | |
11 | * Copyright (C) 2008 Google, Inc. | |
12 | * Author: Mike Lockwood <lockwood@android.com> | |
13 | * | |
14 | * This software is licensed under the terms of the GNU General Public | |
15 | * License version 2, as published by the Free Software Foundation, and | |
16 | * may be copied, distributed, and modified under those terms. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/device.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/extcon.h> | |
32 | #include <linux/slab.h> | |
9baf3220 | 33 | #include <linux/sysfs.h> |
de55d871 | 34 | |
806d9dd7 MH |
35 | /* |
36 | * extcon_cable_name suggests the standard cable names for commonly used | |
37 | * cable types. | |
38 | * | |
39 | * However, please do not use extcon_cable_name directly for extcon_dev | |
40 | * struct's supported_cable pointer unless your device really supports | |
41 | * every single port-type of the following cable names. Please choose cable | |
42 | * names that are actually used in your extcon device. | |
43 | */ | |
0cf6ad8a | 44 | const char extcon_cable_name[][CABLE_NAME_MAX + 1] = { |
806d9dd7 MH |
45 | [EXTCON_USB] = "USB", |
46 | [EXTCON_USB_HOST] = "USB-Host", | |
47 | [EXTCON_TA] = "TA", | |
48 | [EXTCON_FAST_CHARGER] = "Fast-charger", | |
49 | [EXTCON_SLOW_CHARGER] = "Slow-charger", | |
50 | [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream", | |
51 | [EXTCON_HDMI] = "HDMI", | |
52 | [EXTCON_MHL] = "MHL", | |
53 | [EXTCON_DVI] = "DVI", | |
54 | [EXTCON_VGA] = "VGA", | |
55 | [EXTCON_DOCK] = "Dock", | |
56 | [EXTCON_LINE_IN] = "Line-in", | |
57 | [EXTCON_LINE_OUT] = "Line-out", | |
58 | [EXTCON_MIC_IN] = "Microphone", | |
59 | [EXTCON_HEADPHONE_OUT] = "Headphone", | |
60 | [EXTCON_SPDIF_IN] = "SPDIF-in", | |
61 | [EXTCON_SPDIF_OUT] = "SPDIF-out", | |
62 | [EXTCON_VIDEO_IN] = "Video-in", | |
63 | [EXTCON_VIDEO_OUT] = "Video-out", | |
0e1507c8 | 64 | [EXTCON_MECHANICAL] = "Mechanical", |
806d9dd7 MH |
65 | }; |
66 | ||
be3a07f7 | 67 | static struct class *extcon_class; |
449a2bf5 | 68 | #if defined(CONFIG_ANDROID) |
de55d871 | 69 | static struct class_compat *switch_class; |
449a2bf5 | 70 | #endif /* CONFIG_ANDROID */ |
de55d871 | 71 | |
74c5d09b DK |
72 | static LIST_HEAD(extcon_dev_list); |
73 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
74 | ||
bde68e60 MH |
75 | /** |
76 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
77 | * condition. | |
78 | * @edev: the extcon device | |
79 | * @new_state: new cable attach status for @edev | |
80 | * | |
81 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
82 | * violated condition. | |
83 | */ | |
84 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
85 | { | |
86 | int i = 0; | |
87 | ||
88 | if (!edev->mutually_exclusive) | |
89 | return 0; | |
90 | ||
91 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 92 | int weight; |
bde68e60 | 93 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 94 | |
28c0ada6 | 95 | /* calculate the total number of bits set */ |
96 | weight = hweight32(correspondants); | |
97 | if (weight > 1) | |
98 | return i + 1; | |
bde68e60 MH |
99 | } |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
de55d871 MH |
104 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
105 | char *buf) | |
106 | { | |
806d9dd7 | 107 | int i, count = 0; |
de55d871 MH |
108 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); |
109 | ||
110 | if (edev->print_state) { | |
111 | int ret = edev->print_state(edev, buf); | |
112 | ||
113 | if (ret >= 0) | |
114 | return ret; | |
115 | /* Use default if failed */ | |
116 | } | |
806d9dd7 MH |
117 | |
118 | if (edev->max_supported == 0) | |
119 | return sprintf(buf, "%u\n", edev->state); | |
120 | ||
121 | for (i = 0; i < SUPPORTED_CABLE_MAX; i++) { | |
122 | if (!edev->supported_cable[i]) | |
123 | break; | |
124 | count += sprintf(buf + count, "%s=%d\n", | |
125 | edev->supported_cable[i], | |
126 | !!(edev->state & (1 << i))); | |
127 | } | |
128 | ||
129 | return count; | |
130 | } | |
131 | ||
bde68e60 | 132 | int extcon_set_state(struct extcon_dev *edev, u32 state); |
806d9dd7 MH |
133 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
134 | const char *buf, size_t count) | |
135 | { | |
136 | u32 state; | |
137 | ssize_t ret = 0; | |
138 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); | |
139 | ||
140 | ret = sscanf(buf, "0x%x", &state); | |
141 | if (ret == 0) | |
142 | ret = -EINVAL; | |
143 | else | |
bde68e60 | 144 | ret = extcon_set_state(edev, state); |
806d9dd7 MH |
145 | |
146 | if (ret < 0) | |
147 | return ret; | |
148 | ||
149 | return count; | |
de55d871 MH |
150 | } |
151 | ||
152 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
153 | char *buf) | |
154 | { | |
155 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); | |
156 | ||
157 | /* Optional callback given by the user */ | |
158 | if (edev->print_name) { | |
159 | int ret = edev->print_name(edev, buf); | |
160 | if (ret >= 0) | |
161 | return ret; | |
162 | } | |
163 | ||
164 | return sprintf(buf, "%s\n", dev_name(edev->dev)); | |
165 | } | |
166 | ||
806d9dd7 MH |
167 | static ssize_t cable_name_show(struct device *dev, |
168 | struct device_attribute *attr, char *buf) | |
169 | { | |
170 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
171 | attr_name); | |
172 | ||
173 | return sprintf(buf, "%s\n", | |
174 | cable->edev->supported_cable[cable->cable_index]); | |
175 | } | |
176 | ||
177 | static ssize_t cable_state_show(struct device *dev, | |
178 | struct device_attribute *attr, char *buf) | |
179 | { | |
180 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
181 | attr_state); | |
182 | ||
183 | return sprintf(buf, "%d\n", | |
184 | extcon_get_cable_state_(cable->edev, | |
185 | cable->cable_index)); | |
186 | } | |
187 | ||
de55d871 | 188 | /** |
806d9dd7 MH |
189 | * extcon_update_state() - Update the cable attach states of the extcon device |
190 | * only for the masked bits. | |
de55d871 | 191 | * @edev: the extcon device |
806d9dd7 | 192 | * @mask: the bit mask to designate updated bits. |
de55d871 MH |
193 | * @state: new cable attach status for @edev |
194 | * | |
195 | * Changing the state sends uevent with environment variable containing | |
196 | * the name of extcon device (envp[0]) and the state output (envp[1]). | |
197 | * Tizen uses this format for extcon device to get events from ports. | |
198 | * Android uses this format as well. | |
74c5d09b | 199 | * |
806d9dd7 MH |
200 | * Note that the notifier provides which bits are changed in the state |
201 | * variable with the val parameter (second) to the callback. | |
de55d871 | 202 | */ |
bde68e60 | 203 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
de55d871 MH |
204 | { |
205 | char name_buf[120]; | |
206 | char state_buf[120]; | |
207 | char *prop_buf; | |
208 | char *envp[3]; | |
209 | int env_offset = 0; | |
210 | int length; | |
806d9dd7 | 211 | unsigned long flags; |
de55d871 | 212 | |
806d9dd7 | 213 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 214 | |
806d9dd7 MH |
215 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
216 | u32 old_state = edev->state; | |
74c5d09b | 217 | |
bde68e60 MH |
218 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
219 | (state & mask))) { | |
220 | spin_unlock_irqrestore(&edev->lock, flags); | |
221 | return -EPERM; | |
222 | } | |
223 | ||
806d9dd7 MH |
224 | edev->state &= ~mask; |
225 | edev->state |= state & mask; | |
226 | ||
227 | raw_notifier_call_chain(&edev->nh, old_state, edev); | |
228 | ||
229 | /* This could be in interrupt handler */ | |
230 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
de55d871 MH |
231 | if (prop_buf) { |
232 | length = name_show(edev->dev, NULL, prop_buf); | |
233 | if (length > 0) { | |
234 | if (prop_buf[length - 1] == '\n') | |
235 | prop_buf[length - 1] = 0; | |
236 | snprintf(name_buf, sizeof(name_buf), | |
237 | "NAME=%s", prop_buf); | |
238 | envp[env_offset++] = name_buf; | |
239 | } | |
240 | length = state_show(edev->dev, NULL, prop_buf); | |
241 | if (length > 0) { | |
242 | if (prop_buf[length - 1] == '\n') | |
243 | prop_buf[length - 1] = 0; | |
244 | snprintf(state_buf, sizeof(state_buf), | |
245 | "STATE=%s", prop_buf); | |
246 | envp[env_offset++] = state_buf; | |
247 | } | |
248 | envp[env_offset] = NULL; | |
806d9dd7 MH |
249 | /* Unlock early before uevent */ |
250 | spin_unlock_irqrestore(&edev->lock, flags); | |
251 | ||
de55d871 MH |
252 | kobject_uevent_env(&edev->dev->kobj, KOBJ_CHANGE, envp); |
253 | free_page((unsigned long)prop_buf); | |
254 | } else { | |
806d9dd7 MH |
255 | /* Unlock early before uevent */ |
256 | spin_unlock_irqrestore(&edev->lock, flags); | |
257 | ||
de55d871 MH |
258 | dev_err(edev->dev, "out of memory in extcon_set_state\n"); |
259 | kobject_uevent(&edev->dev->kobj, KOBJ_CHANGE); | |
260 | } | |
806d9dd7 MH |
261 | } else { |
262 | /* No changes */ | |
263 | spin_unlock_irqrestore(&edev->lock, flags); | |
de55d871 | 264 | } |
bde68e60 MH |
265 | |
266 | return 0; | |
de55d871 | 267 | } |
806d9dd7 MH |
268 | EXPORT_SYMBOL_GPL(extcon_update_state); |
269 | ||
270 | /** | |
271 | * extcon_set_state() - Set the cable attach states of the extcon device. | |
272 | * @edev: the extcon device | |
273 | * @state: new cable attach status for @edev | |
274 | * | |
275 | * Note that notifier provides which bits are changed in the state | |
276 | * variable with the val parameter (second) to the callback. | |
277 | */ | |
bde68e60 | 278 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
806d9dd7 | 279 | { |
bde68e60 | 280 | return extcon_update_state(edev, 0xffffffff, state); |
806d9dd7 | 281 | } |
de55d871 MH |
282 | EXPORT_SYMBOL_GPL(extcon_set_state); |
283 | ||
806d9dd7 MH |
284 | /** |
285 | * extcon_find_cable_index() - Get the cable index based on the cable name. | |
286 | * @edev: the extcon device that has the cable. | |
287 | * @cable_name: cable name to be searched. | |
288 | * | |
289 | * Note that accessing a cable state based on cable_index is faster than | |
290 | * cable_name because using cable_name induces a loop with strncmp(). | |
291 | * Thus, when get/set_cable_state is repeatedly used, using cable_index | |
292 | * is recommended. | |
293 | */ | |
294 | int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) | |
295 | { | |
296 | int i; | |
297 | ||
298 | if (edev->supported_cable) { | |
299 | for (i = 0; edev->supported_cable[i]; i++) { | |
300 | if (!strncmp(edev->supported_cable[i], | |
301 | cable_name, CABLE_NAME_MAX)) | |
302 | return i; | |
303 | } | |
304 | } | |
305 | ||
306 | return -EINVAL; | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(extcon_find_cable_index); | |
309 | ||
310 | /** | |
311 | * extcon_get_cable_state_() - Get the status of a specific cable. | |
312 | * @edev: the extcon device that has the cable. | |
313 | * @index: cable index that can be retrieved by extcon_find_cable_index(). | |
314 | */ | |
315 | int extcon_get_cable_state_(struct extcon_dev *edev, int index) | |
316 | { | |
317 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
318 | return -EINVAL; | |
319 | ||
320 | return !!(edev->state & (1 << index)); | |
321 | } | |
322 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); | |
323 | ||
324 | /** | |
325 | * extcon_get_cable_state() - Get the status of a specific cable. | |
326 | * @edev: the extcon device that has the cable. | |
327 | * @cable_name: cable name. | |
328 | * | |
329 | * Note that this is slower than extcon_get_cable_state_. | |
330 | */ | |
331 | int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) | |
332 | { | |
333 | return extcon_get_cable_state_(edev, extcon_find_cable_index | |
334 | (edev, cable_name)); | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(extcon_get_cable_state); | |
337 | ||
338 | /** | |
909f9ec0 | 339 | * extcon_set_cable_state_() - Set the status of a specific cable. |
806d9dd7 MH |
340 | * @edev: the extcon device that has the cable. |
341 | * @index: cable index that can be retrieved by extcon_find_cable_index(). | |
342 | * @cable_state: the new cable status. The default semantics is | |
343 | * true: attached / false: detached. | |
344 | */ | |
345 | int extcon_set_cable_state_(struct extcon_dev *edev, | |
346 | int index, bool cable_state) | |
347 | { | |
348 | u32 state; | |
349 | ||
350 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
351 | return -EINVAL; | |
352 | ||
353 | state = cable_state ? (1 << index) : 0; | |
bde68e60 | 354 | return extcon_update_state(edev, 1 << index, state); |
806d9dd7 MH |
355 | } |
356 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); | |
357 | ||
358 | /** | |
909f9ec0 | 359 | * extcon_set_cable_state() - Set the status of a specific cable. |
806d9dd7 MH |
360 | * @edev: the extcon device that has the cable. |
361 | * @cable_name: cable name. | |
362 | * @cable_state: the new cable status. The default semantics is | |
363 | * true: attached / false: detached. | |
364 | * | |
365 | * Note that this is slower than extcon_set_cable_state_. | |
366 | */ | |
367 | int extcon_set_cable_state(struct extcon_dev *edev, | |
368 | const char *cable_name, bool cable_state) | |
369 | { | |
370 | return extcon_set_cable_state_(edev, extcon_find_cable_index | |
371 | (edev, cable_name), cable_state); | |
372 | } | |
373 | EXPORT_SYMBOL_GPL(extcon_set_cable_state); | |
374 | ||
74c5d09b DK |
375 | /** |
376 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
377 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
378 | */ | |
379 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
380 | { | |
381 | struct extcon_dev *sd; | |
382 | ||
383 | mutex_lock(&extcon_dev_list_lock); | |
384 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
385 | if (!strcmp(sd->name, extcon_name)) | |
386 | goto out; | |
387 | } | |
388 | sd = NULL; | |
389 | out: | |
390 | mutex_unlock(&extcon_dev_list_lock); | |
391 | return sd; | |
392 | } | |
393 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
394 | ||
806d9dd7 MH |
395 | static int _call_per_cable(struct notifier_block *nb, unsigned long val, |
396 | void *ptr) | |
397 | { | |
398 | struct extcon_specific_cable_nb *obj = container_of(nb, | |
399 | struct extcon_specific_cable_nb, internal_nb); | |
400 | struct extcon_dev *edev = ptr; | |
401 | ||
402 | if ((val & (1 << obj->cable_index)) != | |
403 | (edev->state & (1 << obj->cable_index))) { | |
f4cce696 CC |
404 | bool cable_state = true; |
405 | ||
806d9dd7 | 406 | obj->previous_value = val; |
f4cce696 CC |
407 | |
408 | if (val & (1 << obj->cable_index)) | |
409 | cable_state = false; | |
410 | ||
411 | return obj->user_nb->notifier_call(obj->user_nb, | |
412 | cable_state, ptr); | |
806d9dd7 MH |
413 | } |
414 | ||
415 | return NOTIFY_OK; | |
416 | } | |
417 | ||
418 | /** | |
419 | * extcon_register_interest() - Register a notifier for a state change of a | |
c338bb03 | 420 | * specific cable, not an entier set of cables of a |
806d9dd7 MH |
421 | * extcon device. |
422 | * @obj: an empty extcon_specific_cable_nb object to be returned. | |
423 | * @extcon_name: the name of extcon device. | |
4f2de3bf JT |
424 | * if NULL, extcon_register_interest will register |
425 | * every cable with the target cable_name given. | |
806d9dd7 MH |
426 | * @cable_name: the target cable name. |
427 | * @nb: the notifier block to get notified. | |
428 | * | |
429 | * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets | |
430 | * the struct for you. | |
431 | * | |
432 | * extcon_register_interest is a helper function for those who want to get | |
433 | * notification for a single specific cable's status change. If a user wants | |
434 | * to get notification for any changes of all cables of a extcon device, | |
435 | * he/she should use the general extcon_register_notifier(). | |
436 | * | |
437 | * Note that the second parameter given to the callback of nb (val) is | |
438 | * "old_state", not the current state. The current state can be retrieved | |
439 | * by looking at the third pameter (edev pointer)'s state value. | |
440 | */ | |
441 | int extcon_register_interest(struct extcon_specific_cable_nb *obj, | |
442 | const char *extcon_name, const char *cable_name, | |
443 | struct notifier_block *nb) | |
444 | { | |
4f2de3bf | 445 | if (!obj || !cable_name || !nb) |
806d9dd7 MH |
446 | return -EINVAL; |
447 | ||
4f2de3bf JT |
448 | if (extcon_name) { |
449 | obj->edev = extcon_get_extcon_dev(extcon_name); | |
450 | if (!obj->edev) | |
451 | return -ENODEV; | |
806d9dd7 | 452 | |
4f2de3bf JT |
453 | obj->cable_index = extcon_find_cable_index(obj->edev, cable_name); |
454 | if (obj->cable_index < 0) | |
c0c078c3 | 455 | return obj->cable_index; |
806d9dd7 | 456 | |
4f2de3bf | 457 | obj->user_nb = nb; |
806d9dd7 | 458 | |
4f2de3bf | 459 | obj->internal_nb.notifier_call = _call_per_cable; |
806d9dd7 | 460 | |
4f2de3bf JT |
461 | return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb); |
462 | } else { | |
463 | struct class_dev_iter iter; | |
464 | struct extcon_dev *extd; | |
465 | struct device *dev; | |
466 | ||
467 | if (!extcon_class) | |
468 | return -ENODEV; | |
469 | class_dev_iter_init(&iter, extcon_class, NULL, NULL); | |
470 | while ((dev = class_dev_iter_next(&iter))) { | |
471 | extd = (struct extcon_dev *)dev_get_drvdata(dev); | |
472 | ||
473 | if (extcon_find_cable_index(extd, cable_name) < 0) | |
474 | continue; | |
475 | ||
476 | class_dev_iter_exit(&iter); | |
477 | return extcon_register_interest(obj, extd->name, | |
478 | cable_name, nb); | |
479 | } | |
480 | ||
481 | return -ENODEV; | |
482 | } | |
806d9dd7 | 483 | } |
9c8a013a | 484 | EXPORT_SYMBOL_GPL(extcon_register_interest); |
806d9dd7 MH |
485 | |
486 | /** | |
487 | * extcon_unregister_interest() - Unregister the notifier registered by | |
488 | * extcon_register_interest(). | |
489 | * @obj: the extcon_specific_cable_nb object returned by | |
490 | * extcon_register_interest(). | |
491 | */ | |
492 | int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) | |
493 | { | |
494 | if (!obj) | |
495 | return -EINVAL; | |
496 | ||
497 | return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); | |
498 | } | |
9c8a013a | 499 | EXPORT_SYMBOL_GPL(extcon_unregister_interest); |
806d9dd7 | 500 | |
74c5d09b | 501 | /** |
c338bb03 | 502 | * extcon_register_notifier() - Register a notifiee to get notified by |
74c5d09b DK |
503 | * any attach status changes from the extcon. |
504 | * @edev: the extcon device. | |
505 | * @nb: a notifier block to be registered. | |
806d9dd7 MH |
506 | * |
507 | * Note that the second parameter given to the callback of nb (val) is | |
508 | * "old_state", not the current state. The current state can be retrieved | |
509 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b DK |
510 | */ |
511 | int extcon_register_notifier(struct extcon_dev *edev, | |
512 | struct notifier_block *nb) | |
513 | { | |
514 | return raw_notifier_chain_register(&edev->nh, nb); | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
517 | ||
518 | /** | |
c338bb03 | 519 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
74c5d09b DK |
520 | * @edev: the extcon device. |
521 | * @nb: a registered notifier block to be unregistered. | |
522 | */ | |
523 | int extcon_unregister_notifier(struct extcon_dev *edev, | |
524 | struct notifier_block *nb) | |
525 | { | |
526 | return raw_notifier_chain_unregister(&edev->nh, nb); | |
527 | } | |
528 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
529 | ||
de55d871 | 530 | static struct device_attribute extcon_attrs[] = { |
806d9dd7 | 531 | __ATTR(state, S_IRUGO | S_IWUSR, state_show, state_store), |
de55d871 | 532 | __ATTR_RO(name), |
806d9dd7 | 533 | __ATTR_NULL, |
de55d871 MH |
534 | }; |
535 | ||
536 | static int create_extcon_class(void) | |
537 | { | |
538 | if (!extcon_class) { | |
539 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
540 | if (IS_ERR(extcon_class)) | |
541 | return PTR_ERR(extcon_class); | |
542 | extcon_class->dev_attrs = extcon_attrs; | |
543 | ||
449a2bf5 | 544 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
545 | switch_class = class_compat_register("switch"); |
546 | if (WARN(!switch_class, "cannot allocate")) | |
547 | return -ENOMEM; | |
449a2bf5 | 548 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
549 | } |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
de55d871 MH |
554 | static void extcon_dev_release(struct device *dev) |
555 | { | |
57e7cd37 | 556 | kfree(dev); |
de55d871 MH |
557 | } |
558 | ||
bde68e60 | 559 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
560 | static void dummy_sysfs_dev_release(struct device *dev) |
561 | { | |
562 | } | |
563 | ||
de55d871 MH |
564 | /** |
565 | * extcon_dev_register() - Register a new extcon device | |
566 | * @edev : the new extcon device (should be allocated before calling) | |
567 | * @dev : the parent device for this extcon device. | |
568 | * | |
569 | * Among the members of edev struct, please set the "user initializing data" | |
570 | * in any case and set the "optional callbacks" if required. However, please | |
571 | * do not set the values of "internal data", which are initialized by | |
572 | * this function. | |
573 | */ | |
574 | int extcon_dev_register(struct extcon_dev *edev, struct device *dev) | |
575 | { | |
806d9dd7 | 576 | int ret, index = 0; |
de55d871 MH |
577 | |
578 | if (!extcon_class) { | |
579 | ret = create_extcon_class(); | |
580 | if (ret < 0) | |
581 | return ret; | |
582 | } | |
583 | ||
806d9dd7 MH |
584 | if (edev->supported_cable) { |
585 | /* Get size of array */ | |
586 | for (index = 0; edev->supported_cable[index]; index++) | |
587 | ; | |
588 | edev->max_supported = index; | |
589 | } else { | |
590 | edev->max_supported = 0; | |
591 | } | |
592 | ||
593 | if (index > SUPPORTED_CABLE_MAX) { | |
594 | dev_err(edev->dev, "extcon: maximum number of supported cables exceeded.\n"); | |
595 | return -EINVAL; | |
596 | } | |
597 | ||
de55d871 | 598 | edev->dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
a1d26ac0 DC |
599 | if (!edev->dev) |
600 | return -ENOMEM; | |
de55d871 MH |
601 | edev->dev->parent = dev; |
602 | edev->dev->class = extcon_class; | |
603 | edev->dev->release = extcon_dev_release; | |
604 | ||
02aa2a37 | 605 | dev_set_name(edev->dev, "%s", edev->name ? edev->name : dev_name(dev)); |
806d9dd7 MH |
606 | |
607 | if (edev->max_supported) { | |
608 | char buf[10]; | |
609 | char *str; | |
610 | struct extcon_cable *cable; | |
611 | ||
612 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
613 | edev->max_supported, GFP_KERNEL); | |
614 | if (!edev->cables) { | |
615 | ret = -ENOMEM; | |
616 | goto err_sysfs_alloc; | |
617 | } | |
618 | for (index = 0; index < edev->max_supported; index++) { | |
619 | cable = &edev->cables[index]; | |
620 | ||
621 | snprintf(buf, 10, "cable.%d", index); | |
622 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
623 | GFP_KERNEL); | |
624 | if (!str) { | |
625 | for (index--; index >= 0; index--) { | |
626 | cable = &edev->cables[index]; | |
627 | kfree(cable->attr_g.name); | |
628 | } | |
629 | ret = -ENOMEM; | |
630 | ||
631 | goto err_alloc_cables; | |
632 | } | |
633 | strcpy(str, buf); | |
634 | ||
635 | cable->edev = edev; | |
636 | cable->cable_index = index; | |
637 | cable->attrs[0] = &cable->attr_name.attr; | |
638 | cable->attrs[1] = &cable->attr_state.attr; | |
639 | cable->attrs[2] = NULL; | |
640 | cable->attr_g.name = str; | |
641 | cable->attr_g.attrs = cable->attrs; | |
642 | ||
9baf3220 | 643 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
644 | cable->attr_name.attr.name = "name"; |
645 | cable->attr_name.attr.mode = 0444; | |
646 | cable->attr_name.show = cable_name_show; | |
647 | ||
9baf3220 | 648 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 649 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 650 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 651 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
652 | } |
653 | } | |
654 | ||
bde68e60 MH |
655 | if (edev->max_supported && edev->mutually_exclusive) { |
656 | char buf[80]; | |
657 | char *name; | |
658 | ||
659 | /* Count the size of mutually_exclusive array */ | |
660 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
661 | ; | |
662 | ||
663 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
664 | (index + 1), GFP_KERNEL); | |
665 | if (!edev->attrs_muex) { | |
666 | ret = -ENOMEM; | |
667 | goto err_muex; | |
668 | } | |
669 | ||
670 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
671 | index, GFP_KERNEL); | |
672 | if (!edev->d_attrs_muex) { | |
673 | ret = -ENOMEM; | |
674 | kfree(edev->attrs_muex); | |
675 | goto err_muex; | |
676 | } | |
677 | ||
678 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
679 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
680 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
681 | GFP_KERNEL); | |
682 | if (!name) { | |
683 | for (index--; index >= 0; index--) { | |
684 | kfree(edev->d_attrs_muex[index].attr. | |
685 | name); | |
686 | } | |
687 | kfree(edev->d_attrs_muex); | |
688 | kfree(edev->attrs_muex); | |
689 | ret = -ENOMEM; | |
690 | goto err_muex; | |
691 | } | |
692 | strcpy(name, buf); | |
9baf3220 | 693 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
694 | edev->d_attrs_muex[index].attr.name = name; |
695 | edev->d_attrs_muex[index].attr.mode = 0000; | |
696 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
697 | .attr; | |
698 | } | |
699 | edev->attr_g_muex.name = muex_name; | |
700 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
701 | ||
702 | } | |
703 | ||
806d9dd7 MH |
704 | if (edev->max_supported) { |
705 | edev->extcon_dev_type.groups = | |
706 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 707 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
708 | if (!edev->extcon_dev_type.groups) { |
709 | ret = -ENOMEM; | |
710 | goto err_alloc_groups; | |
711 | } | |
712 | ||
713 | edev->extcon_dev_type.name = dev_name(edev->dev); | |
714 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; | |
715 | ||
716 | for (index = 0; index < edev->max_supported; index++) | |
717 | edev->extcon_dev_type.groups[index] = | |
718 | &edev->cables[index].attr_g; | |
bde68e60 MH |
719 | if (edev->mutually_exclusive) |
720 | edev->extcon_dev_type.groups[index] = | |
721 | &edev->attr_g_muex; | |
806d9dd7 MH |
722 | |
723 | edev->dev->type = &edev->extcon_dev_type; | |
724 | } | |
725 | ||
de55d871 MH |
726 | ret = device_register(edev->dev); |
727 | if (ret) { | |
728 | put_device(edev->dev); | |
729 | goto err_dev; | |
730 | } | |
449a2bf5 | 731 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
732 | if (switch_class) |
733 | ret = class_compat_create_link(switch_class, edev->dev, | |
c3b15452 | 734 | NULL); |
449a2bf5 | 735 | #endif /* CONFIG_ANDROID */ |
de55d871 | 736 | |
806d9dd7 MH |
737 | spin_lock_init(&edev->lock); |
738 | ||
74c5d09b DK |
739 | RAW_INIT_NOTIFIER_HEAD(&edev->nh); |
740 | ||
de55d871 MH |
741 | dev_set_drvdata(edev->dev, edev); |
742 | edev->state = 0; | |
74c5d09b DK |
743 | |
744 | mutex_lock(&extcon_dev_list_lock); | |
745 | list_add(&edev->entry, &extcon_dev_list); | |
746 | mutex_unlock(&extcon_dev_list_lock); | |
747 | ||
de55d871 MH |
748 | return 0; |
749 | ||
750 | err_dev: | |
806d9dd7 MH |
751 | if (edev->max_supported) |
752 | kfree(edev->extcon_dev_type.groups); | |
753 | err_alloc_groups: | |
bde68e60 MH |
754 | if (edev->max_supported && edev->mutually_exclusive) { |
755 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
756 | kfree(edev->d_attrs_muex[index].attr.name); | |
757 | kfree(edev->d_attrs_muex); | |
758 | kfree(edev->attrs_muex); | |
759 | } | |
760 | err_muex: | |
806d9dd7 MH |
761 | for (index = 0; index < edev->max_supported; index++) |
762 | kfree(edev->cables[index].attr_g.name); | |
763 | err_alloc_cables: | |
764 | if (edev->max_supported) | |
765 | kfree(edev->cables); | |
766 | err_sysfs_alloc: | |
de55d871 MH |
767 | kfree(edev->dev); |
768 | return ret; | |
769 | } | |
770 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
771 | ||
772 | /** | |
773 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 774 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
775 | * |
776 | * Note that this does not call kfree(edev) because edev was not allocated | |
777 | * by this class. | |
778 | */ | |
779 | void extcon_dev_unregister(struct extcon_dev *edev) | |
780 | { | |
57e7cd37 | 781 | int index; |
782 | ||
783 | mutex_lock(&extcon_dev_list_lock); | |
784 | list_del(&edev->entry); | |
785 | mutex_unlock(&extcon_dev_list_lock); | |
786 | ||
787 | if (IS_ERR_OR_NULL(get_device(edev->dev))) { | |
788 | dev_err(edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
789 | dev_name(edev->dev)); | |
790 | return; | |
791 | } | |
792 | ||
793 | if (edev->mutually_exclusive && edev->max_supported) { | |
794 | for (index = 0; edev->mutually_exclusive[index]; | |
795 | index++) | |
796 | kfree(edev->d_attrs_muex[index].attr.name); | |
797 | kfree(edev->d_attrs_muex); | |
798 | kfree(edev->attrs_muex); | |
799 | } | |
800 | ||
801 | for (index = 0; index < edev->max_supported; index++) | |
802 | kfree(edev->cables[index].attr_g.name); | |
803 | ||
804 | if (edev->max_supported) { | |
805 | kfree(edev->extcon_dev_type.groups); | |
806 | kfree(edev->cables); | |
807 | } | |
808 | ||
809 | #if defined(CONFIG_ANDROID) | |
810 | if (switch_class) | |
811 | class_compat_remove_link(switch_class, edev->dev, NULL); | |
812 | #endif | |
813 | device_unregister(edev->dev); | |
814 | put_device(edev->dev); | |
de55d871 MH |
815 | } |
816 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
817 | ||
818 | static int __init extcon_class_init(void) | |
819 | { | |
820 | return create_extcon_class(); | |
821 | } | |
822 | module_init(extcon_class_init); | |
823 | ||
824 | static void __exit extcon_class_exit(void) | |
825 | { | |
0dc77b6d PH |
826 | #if defined(CONFIG_ANDROID) |
827 | class_compat_unregister(switch_class); | |
828 | #endif | |
de55d871 MH |
829 | class_destroy(extcon_class); |
830 | } | |
831 | module_exit(extcon_class_exit); | |
832 | ||
833 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); | |
834 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
835 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
836 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
837 | MODULE_LICENSE("GPL"); |