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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> | |
f841afb1 | 32 | #include <linux/of.h> |
de55d871 | 33 | #include <linux/slab.h> |
9baf3220 | 34 | #include <linux/sysfs.h> |
de55d871 | 35 | |
806d9dd7 MH |
36 | /* |
37 | * extcon_cable_name suggests the standard cable names for commonly used | |
38 | * cable types. | |
39 | * | |
40 | * However, please do not use extcon_cable_name directly for extcon_dev | |
41 | * struct's supported_cable pointer unless your device really supports | |
42 | * every single port-type of the following cable names. Please choose cable | |
43 | * names that are actually used in your extcon device. | |
44 | */ | |
0cf6ad8a | 45 | const char extcon_cable_name[][CABLE_NAME_MAX + 1] = { |
806d9dd7 MH |
46 | [EXTCON_USB] = "USB", |
47 | [EXTCON_USB_HOST] = "USB-Host", | |
48 | [EXTCON_TA] = "TA", | |
49 | [EXTCON_FAST_CHARGER] = "Fast-charger", | |
50 | [EXTCON_SLOW_CHARGER] = "Slow-charger", | |
51 | [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream", | |
52 | [EXTCON_HDMI] = "HDMI", | |
53 | [EXTCON_MHL] = "MHL", | |
54 | [EXTCON_DVI] = "DVI", | |
55 | [EXTCON_VGA] = "VGA", | |
56 | [EXTCON_DOCK] = "Dock", | |
57 | [EXTCON_LINE_IN] = "Line-in", | |
58 | [EXTCON_LINE_OUT] = "Line-out", | |
59 | [EXTCON_MIC_IN] = "Microphone", | |
60 | [EXTCON_HEADPHONE_OUT] = "Headphone", | |
61 | [EXTCON_SPDIF_IN] = "SPDIF-in", | |
62 | [EXTCON_SPDIF_OUT] = "SPDIF-out", | |
63 | [EXTCON_VIDEO_IN] = "Video-in", | |
64 | [EXTCON_VIDEO_OUT] = "Video-out", | |
0e1507c8 | 65 | [EXTCON_MECHANICAL] = "Mechanical", |
806d9dd7 MH |
66 | }; |
67 | ||
be3a07f7 | 68 | static struct class *extcon_class; |
449a2bf5 | 69 | #if defined(CONFIG_ANDROID) |
de55d871 | 70 | static struct class_compat *switch_class; |
449a2bf5 | 71 | #endif /* CONFIG_ANDROID */ |
de55d871 | 72 | |
74c5d09b DK |
73 | static LIST_HEAD(extcon_dev_list); |
74 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
75 | ||
bde68e60 MH |
76 | /** |
77 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
a75e1c73 | 78 | * condition. |
bde68e60 MH |
79 | * @edev: the extcon device |
80 | * @new_state: new cable attach status for @edev | |
81 | * | |
82 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
83 | * violated condition. | |
84 | */ | |
85 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
86 | { | |
87 | int i = 0; | |
88 | ||
89 | if (!edev->mutually_exclusive) | |
90 | return 0; | |
91 | ||
92 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 93 | int weight; |
bde68e60 | 94 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 95 | |
28c0ada6 | 96 | /* calculate the total number of bits set */ |
97 | weight = hweight32(correspondants); | |
98 | if (weight > 1) | |
99 | return i + 1; | |
bde68e60 MH |
100 | } |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
de55d871 MH |
105 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
106 | char *buf) | |
107 | { | |
806d9dd7 | 108 | int i, count = 0; |
cb8bb3a7 | 109 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 MH |
110 | |
111 | if (edev->print_state) { | |
112 | int ret = edev->print_state(edev, buf); | |
113 | ||
114 | if (ret >= 0) | |
115 | return ret; | |
116 | /* Use default if failed */ | |
117 | } | |
806d9dd7 MH |
118 | |
119 | if (edev->max_supported == 0) | |
120 | return sprintf(buf, "%u\n", edev->state); | |
121 | ||
122 | for (i = 0; i < SUPPORTED_CABLE_MAX; i++) { | |
123 | if (!edev->supported_cable[i]) | |
124 | break; | |
125 | count += sprintf(buf + count, "%s=%d\n", | |
126 | edev->supported_cable[i], | |
127 | !!(edev->state & (1 << i))); | |
128 | } | |
129 | ||
130 | return count; | |
131 | } | |
132 | ||
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; | |
cb8bb3a7 | 138 | struct extcon_dev *edev = dev_get_drvdata(dev); |
806d9dd7 MH |
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 | 150 | } |
af01da0e | 151 | static DEVICE_ATTR_RW(state); |
de55d871 MH |
152 | |
153 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
154 | char *buf) | |
155 | { | |
cb8bb3a7 | 156 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 MH |
157 | |
158 | /* Optional callback given by the user */ | |
159 | if (edev->print_name) { | |
160 | int ret = edev->print_name(edev, buf); | |
34825e51 | 161 | |
de55d871 MH |
162 | if (ret >= 0) |
163 | return ret; | |
164 | } | |
165 | ||
dae61651 | 166 | return sprintf(buf, "%s\n", dev_name(&edev->dev)); |
de55d871 | 167 | } |
af01da0e | 168 | static DEVICE_ATTR_RO(name); |
de55d871 | 169 | |
806d9dd7 MH |
170 | static ssize_t cable_name_show(struct device *dev, |
171 | struct device_attribute *attr, char *buf) | |
172 | { | |
173 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
174 | attr_name); | |
175 | ||
176 | return sprintf(buf, "%s\n", | |
177 | cable->edev->supported_cable[cable->cable_index]); | |
178 | } | |
179 | ||
180 | static ssize_t cable_state_show(struct device *dev, | |
181 | struct device_attribute *attr, char *buf) | |
182 | { | |
183 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
184 | attr_state); | |
185 | ||
186 | return sprintf(buf, "%d\n", | |
187 | extcon_get_cable_state_(cable->edev, | |
188 | cable->cable_index)); | |
189 | } | |
190 | ||
de55d871 | 191 | /** |
806d9dd7 | 192 | * extcon_update_state() - Update the cable attach states of the extcon device |
a75e1c73 | 193 | * only for the masked bits. |
de55d871 | 194 | * @edev: the extcon device |
806d9dd7 | 195 | * @mask: the bit mask to designate updated bits. |
de55d871 MH |
196 | * @state: new cable attach status for @edev |
197 | * | |
198 | * Changing the state sends uevent with environment variable containing | |
199 | * the name of extcon device (envp[0]) and the state output (envp[1]). | |
200 | * Tizen uses this format for extcon device to get events from ports. | |
201 | * Android uses this format as well. | |
74c5d09b | 202 | * |
806d9dd7 MH |
203 | * Note that the notifier provides which bits are changed in the state |
204 | * variable with the val parameter (second) to the callback. | |
de55d871 | 205 | */ |
bde68e60 | 206 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
de55d871 MH |
207 | { |
208 | char name_buf[120]; | |
209 | char state_buf[120]; | |
210 | char *prop_buf; | |
211 | char *envp[3]; | |
212 | int env_offset = 0; | |
213 | int length; | |
806d9dd7 | 214 | unsigned long flags; |
de55d871 | 215 | |
806d9dd7 | 216 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 217 | |
806d9dd7 MH |
218 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
219 | u32 old_state = edev->state; | |
74c5d09b | 220 | |
bde68e60 MH |
221 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
222 | (state & mask))) { | |
223 | spin_unlock_irqrestore(&edev->lock, flags); | |
224 | return -EPERM; | |
225 | } | |
226 | ||
806d9dd7 MH |
227 | edev->state &= ~mask; |
228 | edev->state |= state & mask; | |
229 | ||
230 | raw_notifier_call_chain(&edev->nh, old_state, edev); | |
806d9dd7 MH |
231 | /* This could be in interrupt handler */ |
232 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
de55d871 | 233 | if (prop_buf) { |
dae61651 | 234 | length = name_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
235 | if (length > 0) { |
236 | if (prop_buf[length - 1] == '\n') | |
237 | prop_buf[length - 1] = 0; | |
238 | snprintf(name_buf, sizeof(name_buf), | |
239 | "NAME=%s", prop_buf); | |
240 | envp[env_offset++] = name_buf; | |
241 | } | |
dae61651 | 242 | length = state_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
243 | if (length > 0) { |
244 | if (prop_buf[length - 1] == '\n') | |
245 | prop_buf[length - 1] = 0; | |
246 | snprintf(state_buf, sizeof(state_buf), | |
247 | "STATE=%s", prop_buf); | |
248 | envp[env_offset++] = state_buf; | |
249 | } | |
250 | envp[env_offset] = NULL; | |
806d9dd7 MH |
251 | /* Unlock early before uevent */ |
252 | spin_unlock_irqrestore(&edev->lock, flags); | |
253 | ||
dae61651 | 254 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); |
de55d871 MH |
255 | free_page((unsigned long)prop_buf); |
256 | } else { | |
806d9dd7 MH |
257 | /* Unlock early before uevent */ |
258 | spin_unlock_irqrestore(&edev->lock, flags); | |
259 | ||
dae61651 CC |
260 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); |
261 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
de55d871 | 262 | } |
806d9dd7 MH |
263 | } else { |
264 | /* No changes */ | |
265 | spin_unlock_irqrestore(&edev->lock, flags); | |
de55d871 | 266 | } |
bde68e60 MH |
267 | |
268 | return 0; | |
de55d871 | 269 | } |
806d9dd7 MH |
270 | EXPORT_SYMBOL_GPL(extcon_update_state); |
271 | ||
272 | /** | |
273 | * extcon_set_state() - Set the cable attach states of the extcon device. | |
274 | * @edev: the extcon device | |
275 | * @state: new cable attach status for @edev | |
276 | * | |
277 | * Note that notifier provides which bits are changed in the state | |
278 | * variable with the val parameter (second) to the callback. | |
279 | */ | |
bde68e60 | 280 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
806d9dd7 | 281 | { |
bde68e60 | 282 | return extcon_update_state(edev, 0xffffffff, state); |
806d9dd7 | 283 | } |
de55d871 MH |
284 | EXPORT_SYMBOL_GPL(extcon_set_state); |
285 | ||
806d9dd7 MH |
286 | /** |
287 | * extcon_find_cable_index() - Get the cable index based on the cable name. | |
288 | * @edev: the extcon device that has the cable. | |
289 | * @cable_name: cable name to be searched. | |
290 | * | |
291 | * Note that accessing a cable state based on cable_index is faster than | |
292 | * cable_name because using cable_name induces a loop with strncmp(). | |
293 | * Thus, when get/set_cable_state is repeatedly used, using cable_index | |
294 | * is recommended. | |
295 | */ | |
296 | int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) | |
297 | { | |
298 | int i; | |
299 | ||
300 | if (edev->supported_cable) { | |
301 | for (i = 0; edev->supported_cable[i]; i++) { | |
302 | if (!strncmp(edev->supported_cable[i], | |
303 | cable_name, CABLE_NAME_MAX)) | |
304 | return i; | |
305 | } | |
306 | } | |
307 | ||
308 | return -EINVAL; | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(extcon_find_cable_index); | |
311 | ||
312 | /** | |
313 | * extcon_get_cable_state_() - Get the status of a specific cable. | |
314 | * @edev: the extcon device that has the cable. | |
315 | * @index: cable index that can be retrieved by extcon_find_cable_index(). | |
316 | */ | |
317 | int extcon_get_cable_state_(struct extcon_dev *edev, int index) | |
318 | { | |
319 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
320 | return -EINVAL; | |
321 | ||
322 | return !!(edev->state & (1 << index)); | |
323 | } | |
324 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); | |
325 | ||
326 | /** | |
327 | * extcon_get_cable_state() - Get the status of a specific cable. | |
328 | * @edev: the extcon device that has the cable. | |
329 | * @cable_name: cable name. | |
330 | * | |
331 | * Note that this is slower than extcon_get_cable_state_. | |
332 | */ | |
333 | int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) | |
334 | { | |
335 | return extcon_get_cable_state_(edev, extcon_find_cable_index | |
336 | (edev, cable_name)); | |
337 | } | |
338 | EXPORT_SYMBOL_GPL(extcon_get_cable_state); | |
339 | ||
340 | /** | |
909f9ec0 | 341 | * extcon_set_cable_state_() - Set the status of a specific cable. |
a75e1c73 CC |
342 | * @edev: the extcon device that has the cable. |
343 | * @index: cable index that can be retrieved by | |
344 | * extcon_find_cable_index(). | |
806d9dd7 MH |
345 | * @cable_state: the new cable status. The default semantics is |
346 | * true: attached / false: detached. | |
347 | */ | |
348 | int extcon_set_cable_state_(struct extcon_dev *edev, | |
349 | int index, bool cable_state) | |
350 | { | |
351 | u32 state; | |
352 | ||
353 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
354 | return -EINVAL; | |
355 | ||
356 | state = cable_state ? (1 << index) : 0; | |
bde68e60 | 357 | return extcon_update_state(edev, 1 << index, state); |
806d9dd7 MH |
358 | } |
359 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); | |
360 | ||
361 | /** | |
909f9ec0 | 362 | * extcon_set_cable_state() - Set the status of a specific cable. |
a75e1c73 CC |
363 | * @edev: the extcon device that has the cable. |
364 | * @cable_name: cable name. | |
806d9dd7 MH |
365 | * @cable_state: the new cable status. The default semantics is |
366 | * true: attached / false: detached. | |
367 | * | |
368 | * Note that this is slower than extcon_set_cable_state_. | |
369 | */ | |
370 | int extcon_set_cable_state(struct extcon_dev *edev, | |
371 | const char *cable_name, bool cable_state) | |
372 | { | |
373 | return extcon_set_cable_state_(edev, extcon_find_cable_index | |
374 | (edev, cable_name), cable_state); | |
375 | } | |
376 | EXPORT_SYMBOL_GPL(extcon_set_cable_state); | |
377 | ||
74c5d09b DK |
378 | /** |
379 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
380 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
381 | */ | |
382 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
383 | { | |
384 | struct extcon_dev *sd; | |
385 | ||
386 | mutex_lock(&extcon_dev_list_lock); | |
387 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
388 | if (!strcmp(sd->name, extcon_name)) | |
389 | goto out; | |
390 | } | |
391 | sd = NULL; | |
392 | out: | |
393 | mutex_unlock(&extcon_dev_list_lock); | |
394 | return sd; | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
397 | ||
806d9dd7 MH |
398 | static int _call_per_cable(struct notifier_block *nb, unsigned long val, |
399 | void *ptr) | |
400 | { | |
401 | struct extcon_specific_cable_nb *obj = container_of(nb, | |
402 | struct extcon_specific_cable_nb, internal_nb); | |
403 | struct extcon_dev *edev = ptr; | |
404 | ||
405 | if ((val & (1 << obj->cable_index)) != | |
406 | (edev->state & (1 << obj->cable_index))) { | |
f4cce696 CC |
407 | bool cable_state = true; |
408 | ||
806d9dd7 | 409 | obj->previous_value = val; |
f4cce696 CC |
410 | |
411 | if (val & (1 << obj->cable_index)) | |
412 | cable_state = false; | |
413 | ||
414 | return obj->user_nb->notifier_call(obj->user_nb, | |
415 | cable_state, ptr); | |
806d9dd7 MH |
416 | } |
417 | ||
418 | return NOTIFY_OK; | |
419 | } | |
420 | ||
421 | /** | |
422 | * extcon_register_interest() - Register a notifier for a state change of a | |
a75e1c73 CC |
423 | * specific cable, not an entier set of cables of a |
424 | * extcon device. | |
425 | * @obj: an empty extcon_specific_cable_nb object to be returned. | |
806d9dd7 | 426 | * @extcon_name: the name of extcon device. |
4f2de3bf JT |
427 | * if NULL, extcon_register_interest will register |
428 | * every cable with the target cable_name given. | |
806d9dd7 | 429 | * @cable_name: the target cable name. |
a75e1c73 | 430 | * @nb: the notifier block to get notified. |
806d9dd7 MH |
431 | * |
432 | * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets | |
433 | * the struct for you. | |
434 | * | |
435 | * extcon_register_interest is a helper function for those who want to get | |
436 | * notification for a single specific cable's status change. If a user wants | |
437 | * to get notification for any changes of all cables of a extcon device, | |
438 | * he/she should use the general extcon_register_notifier(). | |
439 | * | |
440 | * Note that the second parameter given to the callback of nb (val) is | |
441 | * "old_state", not the current state. The current state can be retrieved | |
442 | * by looking at the third pameter (edev pointer)'s state value. | |
443 | */ | |
444 | int extcon_register_interest(struct extcon_specific_cable_nb *obj, | |
445 | const char *extcon_name, const char *cable_name, | |
446 | struct notifier_block *nb) | |
447 | { | |
66bee35f HG |
448 | unsigned long flags; |
449 | int ret; | |
450 | ||
4f2de3bf | 451 | if (!obj || !cable_name || !nb) |
806d9dd7 MH |
452 | return -EINVAL; |
453 | ||
4f2de3bf JT |
454 | if (extcon_name) { |
455 | obj->edev = extcon_get_extcon_dev(extcon_name); | |
456 | if (!obj->edev) | |
457 | return -ENODEV; | |
806d9dd7 | 458 | |
c2275d2f CC |
459 | obj->cable_index = extcon_find_cable_index(obj->edev, |
460 | cable_name); | |
4f2de3bf | 461 | if (obj->cable_index < 0) |
c0c078c3 | 462 | return obj->cable_index; |
806d9dd7 | 463 | |
4f2de3bf | 464 | obj->user_nb = nb; |
806d9dd7 | 465 | |
4f2de3bf | 466 | obj->internal_nb.notifier_call = _call_per_cable; |
806d9dd7 | 467 | |
66bee35f HG |
468 | spin_lock_irqsave(&obj->edev->lock, flags); |
469 | ret = raw_notifier_chain_register(&obj->edev->nh, | |
c2275d2f | 470 | &obj->internal_nb); |
66bee35f HG |
471 | spin_unlock_irqrestore(&obj->edev->lock, flags); |
472 | return ret; | |
4f2de3bf JT |
473 | } else { |
474 | struct class_dev_iter iter; | |
475 | struct extcon_dev *extd; | |
476 | struct device *dev; | |
477 | ||
478 | if (!extcon_class) | |
479 | return -ENODEV; | |
480 | class_dev_iter_init(&iter, extcon_class, NULL, NULL); | |
481 | while ((dev = class_dev_iter_next(&iter))) { | |
cb8bb3a7 | 482 | extd = dev_get_drvdata(dev); |
4f2de3bf JT |
483 | |
484 | if (extcon_find_cable_index(extd, cable_name) < 0) | |
485 | continue; | |
486 | ||
487 | class_dev_iter_exit(&iter); | |
488 | return extcon_register_interest(obj, extd->name, | |
489 | cable_name, nb); | |
490 | } | |
491 | ||
492 | return -ENODEV; | |
493 | } | |
806d9dd7 | 494 | } |
9c8a013a | 495 | EXPORT_SYMBOL_GPL(extcon_register_interest); |
806d9dd7 MH |
496 | |
497 | /** | |
498 | * extcon_unregister_interest() - Unregister the notifier registered by | |
a75e1c73 | 499 | * extcon_register_interest(). |
806d9dd7 MH |
500 | * @obj: the extcon_specific_cable_nb object returned by |
501 | * extcon_register_interest(). | |
502 | */ | |
503 | int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) | |
504 | { | |
66bee35f HG |
505 | unsigned long flags; |
506 | int ret; | |
507 | ||
806d9dd7 MH |
508 | if (!obj) |
509 | return -EINVAL; | |
510 | ||
66bee35f HG |
511 | spin_lock_irqsave(&obj->edev->lock, flags); |
512 | ret = raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); | |
513 | spin_unlock_irqrestore(&obj->edev->lock, flags); | |
514 | ||
515 | return ret; | |
806d9dd7 | 516 | } |
9c8a013a | 517 | EXPORT_SYMBOL_GPL(extcon_unregister_interest); |
806d9dd7 | 518 | |
74c5d09b | 519 | /** |
c338bb03 | 520 | * extcon_register_notifier() - Register a notifiee to get notified by |
a75e1c73 | 521 | * any attach status changes from the extcon. |
74c5d09b DK |
522 | * @edev: the extcon device. |
523 | * @nb: a notifier block to be registered. | |
806d9dd7 MH |
524 | * |
525 | * Note that the second parameter given to the callback of nb (val) is | |
526 | * "old_state", not the current state. The current state can be retrieved | |
527 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b DK |
528 | */ |
529 | int extcon_register_notifier(struct extcon_dev *edev, | |
530 | struct notifier_block *nb) | |
531 | { | |
66bee35f HG |
532 | unsigned long flags; |
533 | int ret; | |
534 | ||
535 | spin_lock_irqsave(&edev->lock, flags); | |
536 | ret = raw_notifier_chain_register(&edev->nh, nb); | |
537 | spin_unlock_irqrestore(&edev->lock, flags); | |
538 | ||
539 | return ret; | |
74c5d09b DK |
540 | } |
541 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
542 | ||
543 | /** | |
c338bb03 | 544 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
74c5d09b DK |
545 | * @edev: the extcon device. |
546 | * @nb: a registered notifier block to be unregistered. | |
547 | */ | |
548 | int extcon_unregister_notifier(struct extcon_dev *edev, | |
549 | struct notifier_block *nb) | |
550 | { | |
66bee35f HG |
551 | unsigned long flags; |
552 | int ret; | |
553 | ||
554 | spin_lock_irqsave(&edev->lock, flags); | |
555 | ret = raw_notifier_chain_unregister(&edev->nh, nb); | |
556 | spin_unlock_irqrestore(&edev->lock, flags); | |
557 | ||
558 | return ret; | |
74c5d09b DK |
559 | } |
560 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
561 | ||
af01da0e GKH |
562 | static struct attribute *extcon_attrs[] = { |
563 | &dev_attr_state.attr, | |
564 | &dev_attr_name.attr, | |
565 | NULL, | |
de55d871 | 566 | }; |
af01da0e | 567 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
568 | |
569 | static int create_extcon_class(void) | |
570 | { | |
571 | if (!extcon_class) { | |
572 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
573 | if (IS_ERR(extcon_class)) | |
574 | return PTR_ERR(extcon_class); | |
af01da0e | 575 | extcon_class->dev_groups = extcon_groups; |
de55d871 | 576 | |
449a2bf5 | 577 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
578 | switch_class = class_compat_register("switch"); |
579 | if (WARN(!switch_class, "cannot allocate")) | |
580 | return -ENOMEM; | |
449a2bf5 | 581 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
582 | } |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
de55d871 MH |
587 | static void extcon_dev_release(struct device *dev) |
588 | { | |
de55d871 MH |
589 | } |
590 | ||
bde68e60 | 591 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
592 | static void dummy_sysfs_dev_release(struct device *dev) |
593 | { | |
594 | } | |
595 | ||
a9af6522 CC |
596 | /* |
597 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
598 | * @supported_cable: Array of supported cable names ending with NULL. | |
599 | * If supported_cable is NULL, cable name related APIs | |
600 | * are disabled. | |
601 | * | |
602 | * This function allocates the memory for extcon device without allocating | |
603 | * memory in each extcon provider driver and initialize default setting for | |
604 | * extcon device. | |
605 | * | |
606 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail | |
607 | */ | |
608 | struct extcon_dev *extcon_dev_allocate(const char **supported_cable) | |
609 | { | |
610 | struct extcon_dev *edev; | |
611 | ||
612 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); | |
613 | if (!edev) | |
614 | return ERR_PTR(-ENOMEM); | |
615 | ||
616 | edev->max_supported = 0; | |
617 | edev->supported_cable = supported_cable; | |
618 | ||
619 | return edev; | |
620 | } | |
621 | ||
622 | /* | |
623 | * extcon_dev_free() - Free the memory of extcon device. | |
624 | * @edev: the extcon device to free | |
625 | */ | |
626 | void extcon_dev_free(struct extcon_dev *edev) | |
627 | { | |
628 | kfree(edev); | |
629 | } | |
630 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
631 | ||
739ba1bf CC |
632 | static int devm_extcon_dev_match(struct device *dev, void *res, void *data) |
633 | { | |
634 | struct extcon_dev **r = res; | |
635 | ||
636 | if (WARN_ON(!r || !*r)) | |
637 | return 0; | |
638 | ||
639 | return *r == data; | |
640 | } | |
641 | ||
642 | static void devm_extcon_dev_release(struct device *dev, void *res) | |
643 | { | |
644 | extcon_dev_free(*(struct extcon_dev **)res); | |
645 | } | |
646 | ||
647 | /** | |
648 | * devm_extcon_dev_allocate - Allocate managed extcon device | |
649 | * @dev: device owning the extcon device being created | |
650 | * @supported_cable: Array of supported cable names ending with NULL. | |
651 | * If supported_cable is NULL, cable name related APIs | |
652 | * are disabled. | |
653 | * | |
654 | * This function manages automatically the memory of extcon device using device | |
655 | * resource management and simplify the control of freeing the memory of extcon | |
656 | * device. | |
657 | * | |
658 | * Returns the pointer memory of allocated extcon_dev if success | |
659 | * or ERR_PTR(err) if fail | |
660 | */ | |
661 | struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, | |
662 | const char **supported_cable) | |
663 | { | |
664 | struct extcon_dev **ptr, *edev; | |
665 | ||
666 | ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); | |
667 | if (!ptr) | |
668 | return ERR_PTR(-ENOMEM); | |
669 | ||
670 | edev = extcon_dev_allocate(supported_cable); | |
671 | if (IS_ERR(edev)) { | |
672 | devres_free(ptr); | |
673 | return edev; | |
674 | } | |
675 | ||
ac65a625 CC |
676 | edev->dev.parent = dev; |
677 | ||
739ba1bf CC |
678 | *ptr = edev; |
679 | devres_add(dev, ptr); | |
680 | ||
681 | return edev; | |
682 | } | |
683 | EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); | |
684 | ||
685 | void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) | |
686 | { | |
687 | WARN_ON(devres_release(dev, devm_extcon_dev_release, | |
688 | devm_extcon_dev_match, edev)); | |
689 | } | |
690 | EXPORT_SYMBOL_GPL(devm_extcon_dev_free); | |
691 | ||
de55d871 MH |
692 | /** |
693 | * extcon_dev_register() - Register a new extcon device | |
694 | * @edev : the new extcon device (should be allocated before calling) | |
de55d871 MH |
695 | * |
696 | * Among the members of edev struct, please set the "user initializing data" | |
697 | * in any case and set the "optional callbacks" if required. However, please | |
698 | * do not set the values of "internal data", which are initialized by | |
699 | * this function. | |
700 | */ | |
42d7d753 | 701 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 702 | { |
806d9dd7 | 703 | int ret, index = 0; |
de55d871 MH |
704 | |
705 | if (!extcon_class) { | |
706 | ret = create_extcon_class(); | |
707 | if (ret < 0) | |
708 | return ret; | |
709 | } | |
710 | ||
806d9dd7 MH |
711 | if (edev->supported_cable) { |
712 | /* Get size of array */ | |
713 | for (index = 0; edev->supported_cable[index]; index++) | |
714 | ; | |
715 | edev->max_supported = index; | |
716 | } else { | |
717 | edev->max_supported = 0; | |
718 | } | |
719 | ||
720 | if (index > SUPPORTED_CABLE_MAX) { | |
dae61651 | 721 | dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\n"); |
806d9dd7 MH |
722 | return -EINVAL; |
723 | } | |
724 | ||
dae61651 CC |
725 | edev->dev.class = extcon_class; |
726 | edev->dev.release = extcon_dev_release; | |
de55d871 | 727 | |
42d7d753 CC |
728 | edev->name = edev->name ? edev->name : dev_name(edev->dev.parent); |
729 | if (IS_ERR_OR_NULL(edev->name)) { | |
730 | dev_err(&edev->dev, | |
731 | "extcon device name is null\n"); | |
732 | return -EINVAL; | |
733 | } | |
dae61651 | 734 | dev_set_name(&edev->dev, "%s", edev->name); |
806d9dd7 MH |
735 | |
736 | if (edev->max_supported) { | |
737 | char buf[10]; | |
738 | char *str; | |
739 | struct extcon_cable *cable; | |
740 | ||
741 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
742 | edev->max_supported, GFP_KERNEL); | |
743 | if (!edev->cables) { | |
744 | ret = -ENOMEM; | |
745 | goto err_sysfs_alloc; | |
746 | } | |
747 | for (index = 0; index < edev->max_supported; index++) { | |
748 | cable = &edev->cables[index]; | |
749 | ||
750 | snprintf(buf, 10, "cable.%d", index); | |
751 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
752 | GFP_KERNEL); | |
753 | if (!str) { | |
754 | for (index--; index >= 0; index--) { | |
755 | cable = &edev->cables[index]; | |
756 | kfree(cable->attr_g.name); | |
757 | } | |
758 | ret = -ENOMEM; | |
759 | ||
760 | goto err_alloc_cables; | |
761 | } | |
762 | strcpy(str, buf); | |
763 | ||
764 | cable->edev = edev; | |
765 | cable->cable_index = index; | |
766 | cable->attrs[0] = &cable->attr_name.attr; | |
767 | cable->attrs[1] = &cable->attr_state.attr; | |
768 | cable->attrs[2] = NULL; | |
769 | cable->attr_g.name = str; | |
770 | cable->attr_g.attrs = cable->attrs; | |
771 | ||
9baf3220 | 772 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
773 | cable->attr_name.attr.name = "name"; |
774 | cable->attr_name.attr.mode = 0444; | |
775 | cable->attr_name.show = cable_name_show; | |
776 | ||
9baf3220 | 777 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 778 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 779 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 780 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
781 | } |
782 | } | |
783 | ||
bde68e60 MH |
784 | if (edev->max_supported && edev->mutually_exclusive) { |
785 | char buf[80]; | |
786 | char *name; | |
787 | ||
788 | /* Count the size of mutually_exclusive array */ | |
789 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
790 | ; | |
791 | ||
792 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
793 | (index + 1), GFP_KERNEL); | |
794 | if (!edev->attrs_muex) { | |
795 | ret = -ENOMEM; | |
796 | goto err_muex; | |
797 | } | |
798 | ||
799 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
800 | index, GFP_KERNEL); | |
801 | if (!edev->d_attrs_muex) { | |
802 | ret = -ENOMEM; | |
803 | kfree(edev->attrs_muex); | |
804 | goto err_muex; | |
805 | } | |
806 | ||
807 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
808 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
809 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
810 | GFP_KERNEL); | |
811 | if (!name) { | |
812 | for (index--; index >= 0; index--) { | |
813 | kfree(edev->d_attrs_muex[index].attr. | |
814 | name); | |
815 | } | |
816 | kfree(edev->d_attrs_muex); | |
817 | kfree(edev->attrs_muex); | |
818 | ret = -ENOMEM; | |
819 | goto err_muex; | |
820 | } | |
821 | strcpy(name, buf); | |
9baf3220 | 822 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
823 | edev->d_attrs_muex[index].attr.name = name; |
824 | edev->d_attrs_muex[index].attr.mode = 0000; | |
825 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
826 | .attr; | |
827 | } | |
828 | edev->attr_g_muex.name = muex_name; | |
829 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
830 | ||
831 | } | |
832 | ||
806d9dd7 MH |
833 | if (edev->max_supported) { |
834 | edev->extcon_dev_type.groups = | |
835 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 836 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
837 | if (!edev->extcon_dev_type.groups) { |
838 | ret = -ENOMEM; | |
839 | goto err_alloc_groups; | |
840 | } | |
841 | ||
dae61651 | 842 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
843 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
844 | ||
845 | for (index = 0; index < edev->max_supported; index++) | |
846 | edev->extcon_dev_type.groups[index] = | |
847 | &edev->cables[index].attr_g; | |
bde68e60 MH |
848 | if (edev->mutually_exclusive) |
849 | edev->extcon_dev_type.groups[index] = | |
850 | &edev->attr_g_muex; | |
806d9dd7 | 851 | |
dae61651 | 852 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
853 | } |
854 | ||
dae61651 | 855 | ret = device_register(&edev->dev); |
de55d871 | 856 | if (ret) { |
dae61651 | 857 | put_device(&edev->dev); |
de55d871 MH |
858 | goto err_dev; |
859 | } | |
449a2bf5 | 860 | #if defined(CONFIG_ANDROID) |
de55d871 | 861 | if (switch_class) |
dae61651 | 862 | ret = class_compat_create_link(switch_class, &edev->dev, NULL); |
449a2bf5 | 863 | #endif /* CONFIG_ANDROID */ |
de55d871 | 864 | |
806d9dd7 MH |
865 | spin_lock_init(&edev->lock); |
866 | ||
74c5d09b DK |
867 | RAW_INIT_NOTIFIER_HEAD(&edev->nh); |
868 | ||
dae61651 | 869 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 870 | edev->state = 0; |
74c5d09b DK |
871 | |
872 | mutex_lock(&extcon_dev_list_lock); | |
873 | list_add(&edev->entry, &extcon_dev_list); | |
874 | mutex_unlock(&extcon_dev_list_lock); | |
875 | ||
de55d871 MH |
876 | return 0; |
877 | ||
878 | err_dev: | |
806d9dd7 MH |
879 | if (edev->max_supported) |
880 | kfree(edev->extcon_dev_type.groups); | |
881 | err_alloc_groups: | |
bde68e60 MH |
882 | if (edev->max_supported && edev->mutually_exclusive) { |
883 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
884 | kfree(edev->d_attrs_muex[index].attr.name); | |
885 | kfree(edev->d_attrs_muex); | |
886 | kfree(edev->attrs_muex); | |
887 | } | |
888 | err_muex: | |
806d9dd7 MH |
889 | for (index = 0; index < edev->max_supported; index++) |
890 | kfree(edev->cables[index].attr_g.name); | |
891 | err_alloc_cables: | |
892 | if (edev->max_supported) | |
893 | kfree(edev->cables); | |
894 | err_sysfs_alloc: | |
de55d871 MH |
895 | return ret; |
896 | } | |
897 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
898 | ||
899 | /** | |
900 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 901 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
902 | * |
903 | * Note that this does not call kfree(edev) because edev was not allocated | |
904 | * by this class. | |
905 | */ | |
906 | void extcon_dev_unregister(struct extcon_dev *edev) | |
907 | { | |
57e7cd37 | 908 | int index; |
909 | ||
910 | mutex_lock(&extcon_dev_list_lock); | |
911 | list_del(&edev->entry); | |
912 | mutex_unlock(&extcon_dev_list_lock); | |
913 | ||
dae61651 CC |
914 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
915 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
916 | dev_name(&edev->dev)); | |
57e7cd37 | 917 | return; |
918 | } | |
919 | ||
7585ca0d WX |
920 | device_unregister(&edev->dev); |
921 | ||
57e7cd37 | 922 | if (edev->mutually_exclusive && edev->max_supported) { |
923 | for (index = 0; edev->mutually_exclusive[index]; | |
924 | index++) | |
925 | kfree(edev->d_attrs_muex[index].attr.name); | |
926 | kfree(edev->d_attrs_muex); | |
927 | kfree(edev->attrs_muex); | |
928 | } | |
929 | ||
930 | for (index = 0; index < edev->max_supported; index++) | |
931 | kfree(edev->cables[index].attr_g.name); | |
932 | ||
933 | if (edev->max_supported) { | |
934 | kfree(edev->extcon_dev_type.groups); | |
935 | kfree(edev->cables); | |
936 | } | |
937 | ||
938 | #if defined(CONFIG_ANDROID) | |
939 | if (switch_class) | |
dae61651 | 940 | class_compat_remove_link(switch_class, &edev->dev, NULL); |
57e7cd37 | 941 | #endif |
dae61651 | 942 | put_device(&edev->dev); |
de55d871 MH |
943 | } |
944 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
945 | ||
1111244f SW |
946 | static void devm_extcon_dev_unreg(struct device *dev, void *res) |
947 | { | |
948 | extcon_dev_unregister(*(struct extcon_dev **)res); | |
949 | } | |
950 | ||
1111244f SW |
951 | /** |
952 | * devm_extcon_dev_register() - Resource-managed extcon_dev_register() | |
953 | * @dev: device to allocate extcon device | |
954 | * @edev: the new extcon device to register | |
955 | * | |
956 | * Managed extcon_dev_register() function. If extcon device is attached with | |
957 | * this function, that extcon device is automatically unregistered on driver | |
958 | * detach. Internally this function calls extcon_dev_register() function. | |
959 | * To get more information, refer that function. | |
960 | * | |
961 | * If extcon device is registered with this function and the device needs to be | |
962 | * unregistered separately, devm_extcon_dev_unregister() should be used. | |
963 | * | |
964 | * Returns 0 if success or negaive error number if failure. | |
965 | */ | |
966 | int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) | |
967 | { | |
968 | struct extcon_dev **ptr; | |
969 | int ret; | |
970 | ||
971 | ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); | |
972 | if (!ptr) | |
973 | return -ENOMEM; | |
974 | ||
975 | ret = extcon_dev_register(edev); | |
976 | if (ret) { | |
977 | devres_free(ptr); | |
978 | return ret; | |
979 | } | |
980 | ||
981 | *ptr = edev; | |
982 | devres_add(dev, ptr); | |
983 | ||
984 | return 0; | |
985 | } | |
986 | EXPORT_SYMBOL_GPL(devm_extcon_dev_register); | |
987 | ||
988 | /** | |
989 | * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() | |
990 | * @dev: device the extcon belongs to | |
991 | * @edev: the extcon device to unregister | |
992 | * | |
993 | * Unregister extcon device that is registered with devm_extcon_dev_register() | |
994 | * function. | |
995 | */ | |
996 | void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) | |
997 | { | |
998 | WARN_ON(devres_release(dev, devm_extcon_dev_unreg, | |
999 | devm_extcon_dev_match, edev)); | |
1000 | } | |
1001 | EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); | |
1002 | ||
1ad94ffe CC |
1003 | #ifdef CONFIG_OF |
1004 | /* | |
1005 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree | |
1006 | * @dev - instance to the given device | |
1007 | * @index - index into list of extcon_dev | |
1008 | * | |
1009 | * return the instance of extcon device | |
1010 | */ | |
1011 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1012 | { | |
1013 | struct device_node *node; | |
1014 | struct extcon_dev *edev; | |
1015 | ||
1016 | if (!dev->of_node) { | |
1017 | dev_err(dev, "device does not have a device node entry\n"); | |
1018 | return ERR_PTR(-EINVAL); | |
1019 | } | |
1020 | ||
1021 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
1022 | if (!node) { | |
1023 | dev_err(dev, "failed to get phandle in %s node\n", | |
1024 | dev->of_node->full_name); | |
1025 | return ERR_PTR(-ENODEV); | |
1026 | } | |
1027 | ||
f841afb1 TF |
1028 | mutex_lock(&extcon_dev_list_lock); |
1029 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
1030 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
1031 | mutex_unlock(&extcon_dev_list_lock); | |
1032 | return edev; | |
1033 | } | |
1ad94ffe | 1034 | } |
f841afb1 | 1035 | mutex_unlock(&extcon_dev_list_lock); |
1ad94ffe | 1036 | |
f841afb1 | 1037 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
1038 | } |
1039 | #else | |
1040 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1041 | { | |
1042 | return ERR_PTR(-ENOSYS); | |
1043 | } | |
1044 | #endif /* CONFIG_OF */ | |
1045 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
1046 | ||
de55d871 MH |
1047 | static int __init extcon_class_init(void) |
1048 | { | |
1049 | return create_extcon_class(); | |
1050 | } | |
1051 | module_init(extcon_class_init); | |
1052 | ||
1053 | static void __exit extcon_class_exit(void) | |
1054 | { | |
0dc77b6d PH |
1055 | #if defined(CONFIG_ANDROID) |
1056 | class_compat_unregister(switch_class); | |
1057 | #endif | |
de55d871 MH |
1058 | class_destroy(extcon_class); |
1059 | } | |
1060 | module_exit(extcon_class_exit); | |
1061 | ||
1062 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); | |
1063 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
1064 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
1065 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
1066 | MODULE_LICENSE("GPL"); |