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Commit | Line | Data |
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de55d871 | 1 | /* |
b9ec23c0 | 2 | * drivers/extcon/extcon.c - External Connector (extcon) framework. |
de55d871 MH |
3 | * |
4 | * External connector (extcon) class driver | |
5 | * | |
2a9de9c0 CC |
6 | * Copyright (C) 2015 Samsung Electronics |
7 | * Author: Chanwoo Choi <cw00.choi@samsung.com> | |
8 | * | |
de55d871 MH |
9 | * Copyright (C) 2012 Samsung Electronics |
10 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
11 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
12 | * | |
13 | * based on android/drivers/switch/switch_class.c | |
14 | * Copyright (C) 2008 Google, Inc. | |
15 | * Author: Mike Lockwood <lockwood@android.com> | |
16 | * | |
17 | * This software is licensed under the terms of the GNU General Public | |
18 | * License version 2, as published by the Free Software Foundation, and | |
19 | * may be copied, distributed, and modified under those terms. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
b9ec23c0 | 25 | */ |
de55d871 MH |
26 | |
27 | #include <linux/module.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/fs.h> | |
32 | #include <linux/err.h> | |
33 | #include <linux/extcon.h> | |
f841afb1 | 34 | #include <linux/of.h> |
de55d871 | 35 | #include <linux/slab.h> |
9baf3220 | 36 | #include <linux/sysfs.h> |
de55d871 | 37 | |
2a9de9c0 CC |
38 | #define SUPPORTED_CABLE_MAX 32 |
39 | #define CABLE_NAME_MAX 30 | |
40 | ||
41 | static const char *extcon_name[] = { | |
8e9bc36d | 42 | /* USB external connector */ |
806d9dd7 | 43 | [EXTCON_USB] = "USB", |
8e9bc36d CC |
44 | [EXTCON_USB_HOST] = "USB-HOST", |
45 | ||
46 | /* Charger external connector */ | |
806d9dd7 | 47 | [EXTCON_TA] = "TA", |
8e9bc36d CC |
48 | [EXTCON_FAST_CHARGER] = "FAST-CHARGER", |
49 | [EXTCON_SLOW_CHARGER] = "SLOW-CHARGER", | |
50 | [EXTCON_CHARGE_DOWNSTREAM] = "CHARGE-DOWNSTREAM", | |
51 | ||
52 | /* Audio/Video external connector */ | |
53 | [EXTCON_LINE_IN] = "LINE-IN", | |
54 | [EXTCON_LINE_OUT] = "LINE-OUT", | |
55 | [EXTCON_MICROPHONE] = "MICROPHONE", | |
56 | [EXTCON_HEADPHONE] = "HEADPHONE", | |
57 | ||
806d9dd7 MH |
58 | [EXTCON_HDMI] = "HDMI", |
59 | [EXTCON_MHL] = "MHL", | |
60 | [EXTCON_DVI] = "DVI", | |
61 | [EXTCON_VGA] = "VGA", | |
8e9bc36d CC |
62 | [EXTCON_SPDIF_IN] = "SPDIF-IN", |
63 | [EXTCON_SPDIF_OUT] = "SPDIF-OUT", | |
64 | [EXTCON_VIDEO_IN] = "VIDEO-IN", | |
65 | [EXTCON_VIDEO_OUT] = "VIDEO-OUT", | |
66 | ||
67 | /* Etc external connector */ | |
68 | [EXTCON_DOCK] = "DOCK", | |
2a9de9c0 | 69 | [EXTCON_JIG] = "JIG", |
8e9bc36d CC |
70 | [EXTCON_MECHANICAL] = "MECHANICAL", |
71 | ||
2a9de9c0 | 72 | NULL, |
806d9dd7 MH |
73 | }; |
74 | ||
be3a07f7 | 75 | static struct class *extcon_class; |
449a2bf5 | 76 | #if defined(CONFIG_ANDROID) |
de55d871 | 77 | static struct class_compat *switch_class; |
449a2bf5 | 78 | #endif /* CONFIG_ANDROID */ |
de55d871 | 79 | |
74c5d09b DK |
80 | static LIST_HEAD(extcon_dev_list); |
81 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
82 | ||
bde68e60 MH |
83 | /** |
84 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
a75e1c73 | 85 | * condition. |
bde68e60 MH |
86 | * @edev: the extcon device |
87 | * @new_state: new cable attach status for @edev | |
88 | * | |
89 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
90 | * violated condition. | |
91 | */ | |
92 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
93 | { | |
94 | int i = 0; | |
95 | ||
96 | if (!edev->mutually_exclusive) | |
97 | return 0; | |
98 | ||
99 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 100 | int weight; |
bde68e60 | 101 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 102 | |
28c0ada6 | 103 | /* calculate the total number of bits set */ |
104 | weight = hweight32(correspondants); | |
105 | if (weight > 1) | |
106 | return i + 1; | |
bde68e60 MH |
107 | } |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
2a9de9c0 CC |
112 | static int find_cable_index_by_id(struct extcon_dev *edev, const enum extcon id) |
113 | { | |
114 | int i; | |
115 | ||
116 | /* Find the the index of extcon cable in edev->supported_cable */ | |
117 | for (i = 0; i < edev->max_supported; i++) { | |
118 | if (edev->supported_cable[i] == id) | |
119 | return i; | |
120 | } | |
121 | ||
122 | return -EINVAL; | |
123 | } | |
124 | ||
125 | static int find_cable_index_by_name(struct extcon_dev *edev, const char *name) | |
126 | { | |
127 | enum extcon id = EXTCON_NONE; | |
128 | int i; | |
129 | ||
130 | if (edev->max_supported == 0) | |
131 | return -EINVAL; | |
132 | ||
133 | /* Find the the number of extcon cable */ | |
134 | for (i = 0; i < EXTCON_END; i++) { | |
135 | if (!extcon_name[i]) | |
136 | continue; | |
137 | if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) { | |
138 | id = i; | |
139 | break; | |
140 | } | |
141 | } | |
142 | ||
143 | if (id == EXTCON_NONE) | |
144 | return -EINVAL; | |
145 | ||
146 | return find_cable_index_by_id(edev, id); | |
147 | } | |
148 | ||
de55d871 MH |
149 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
150 | char *buf) | |
151 | { | |
806d9dd7 | 152 | int i, count = 0; |
cb8bb3a7 | 153 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 MH |
154 | |
155 | if (edev->print_state) { | |
156 | int ret = edev->print_state(edev, buf); | |
157 | ||
158 | if (ret >= 0) | |
159 | return ret; | |
160 | /* Use default if failed */ | |
161 | } | |
806d9dd7 MH |
162 | |
163 | if (edev->max_supported == 0) | |
164 | return sprintf(buf, "%u\n", edev->state); | |
165 | ||
2a9de9c0 | 166 | for (i = 0; i < edev->max_supported; i++) { |
806d9dd7 | 167 | count += sprintf(buf + count, "%s=%d\n", |
2a9de9c0 | 168 | extcon_name[edev->supported_cable[i]], |
806d9dd7 MH |
169 | !!(edev->state & (1 << i))); |
170 | } | |
171 | ||
172 | return count; | |
173 | } | |
174 | ||
806d9dd7 MH |
175 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
176 | const char *buf, size_t count) | |
177 | { | |
178 | u32 state; | |
179 | ssize_t ret = 0; | |
cb8bb3a7 | 180 | struct extcon_dev *edev = dev_get_drvdata(dev); |
806d9dd7 MH |
181 | |
182 | ret = sscanf(buf, "0x%x", &state); | |
183 | if (ret == 0) | |
184 | ret = -EINVAL; | |
185 | else | |
bde68e60 | 186 | ret = extcon_set_state(edev, state); |
806d9dd7 MH |
187 | |
188 | if (ret < 0) | |
189 | return ret; | |
190 | ||
191 | return count; | |
de55d871 | 192 | } |
af01da0e | 193 | static DEVICE_ATTR_RW(state); |
de55d871 MH |
194 | |
195 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
196 | char *buf) | |
197 | { | |
cb8bb3a7 | 198 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 MH |
199 | |
200 | /* Optional callback given by the user */ | |
201 | if (edev->print_name) { | |
202 | int ret = edev->print_name(edev, buf); | |
34825e51 | 203 | |
de55d871 MH |
204 | if (ret >= 0) |
205 | return ret; | |
206 | } | |
207 | ||
71c3ffa5 | 208 | return sprintf(buf, "%s\n", edev->name); |
de55d871 | 209 | } |
af01da0e | 210 | static DEVICE_ATTR_RO(name); |
de55d871 | 211 | |
806d9dd7 MH |
212 | static ssize_t cable_name_show(struct device *dev, |
213 | struct device_attribute *attr, char *buf) | |
214 | { | |
215 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
216 | attr_name); | |
2a9de9c0 | 217 | int i = cable->cable_index; |
806d9dd7 MH |
218 | |
219 | return sprintf(buf, "%s\n", | |
2a9de9c0 | 220 | extcon_name[cable->edev->supported_cable[i]]); |
806d9dd7 MH |
221 | } |
222 | ||
223 | static ssize_t cable_state_show(struct device *dev, | |
224 | struct device_attribute *attr, char *buf) | |
225 | { | |
226 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
227 | attr_state); | |
228 | ||
229 | return sprintf(buf, "%d\n", | |
230 | extcon_get_cable_state_(cable->edev, | |
231 | cable->cable_index)); | |
232 | } | |
233 | ||
de55d871 | 234 | /** |
806d9dd7 | 235 | * extcon_update_state() - Update the cable attach states of the extcon device |
a75e1c73 | 236 | * only for the masked bits. |
de55d871 | 237 | * @edev: the extcon device |
806d9dd7 | 238 | * @mask: the bit mask to designate updated bits. |
de55d871 MH |
239 | * @state: new cable attach status for @edev |
240 | * | |
241 | * Changing the state sends uevent with environment variable containing | |
242 | * the name of extcon device (envp[0]) and the state output (envp[1]). | |
243 | * Tizen uses this format for extcon device to get events from ports. | |
244 | * Android uses this format as well. | |
74c5d09b | 245 | * |
806d9dd7 MH |
246 | * Note that the notifier provides which bits are changed in the state |
247 | * variable with the val parameter (second) to the callback. | |
de55d871 | 248 | */ |
bde68e60 | 249 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
de55d871 MH |
250 | { |
251 | char name_buf[120]; | |
252 | char state_buf[120]; | |
253 | char *prop_buf; | |
254 | char *envp[3]; | |
255 | int env_offset = 0; | |
256 | int length; | |
806d9dd7 | 257 | unsigned long flags; |
de55d871 | 258 | |
806d9dd7 | 259 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 260 | |
806d9dd7 MH |
261 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
262 | u32 old_state = edev->state; | |
74c5d09b | 263 | |
bde68e60 MH |
264 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
265 | (state & mask))) { | |
266 | spin_unlock_irqrestore(&edev->lock, flags); | |
267 | return -EPERM; | |
268 | } | |
269 | ||
806d9dd7 MH |
270 | edev->state &= ~mask; |
271 | edev->state |= state & mask; | |
272 | ||
273 | raw_notifier_call_chain(&edev->nh, old_state, edev); | |
806d9dd7 MH |
274 | /* This could be in interrupt handler */ |
275 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
de55d871 | 276 | if (prop_buf) { |
dae61651 | 277 | length = name_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
278 | if (length > 0) { |
279 | if (prop_buf[length - 1] == '\n') | |
280 | prop_buf[length - 1] = 0; | |
281 | snprintf(name_buf, sizeof(name_buf), | |
282 | "NAME=%s", prop_buf); | |
283 | envp[env_offset++] = name_buf; | |
284 | } | |
dae61651 | 285 | length = state_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
286 | if (length > 0) { |
287 | if (prop_buf[length - 1] == '\n') | |
288 | prop_buf[length - 1] = 0; | |
289 | snprintf(state_buf, sizeof(state_buf), | |
290 | "STATE=%s", prop_buf); | |
291 | envp[env_offset++] = state_buf; | |
292 | } | |
293 | envp[env_offset] = NULL; | |
806d9dd7 MH |
294 | /* Unlock early before uevent */ |
295 | spin_unlock_irqrestore(&edev->lock, flags); | |
296 | ||
dae61651 | 297 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); |
de55d871 MH |
298 | free_page((unsigned long)prop_buf); |
299 | } else { | |
806d9dd7 MH |
300 | /* Unlock early before uevent */ |
301 | spin_unlock_irqrestore(&edev->lock, flags); | |
302 | ||
dae61651 CC |
303 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); |
304 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
de55d871 | 305 | } |
806d9dd7 MH |
306 | } else { |
307 | /* No changes */ | |
308 | spin_unlock_irqrestore(&edev->lock, flags); | |
de55d871 | 309 | } |
bde68e60 MH |
310 | |
311 | return 0; | |
de55d871 | 312 | } |
806d9dd7 MH |
313 | EXPORT_SYMBOL_GPL(extcon_update_state); |
314 | ||
315 | /** | |
316 | * extcon_set_state() - Set the cable attach states of the extcon device. | |
317 | * @edev: the extcon device | |
318 | * @state: new cable attach status for @edev | |
319 | * | |
320 | * Note that notifier provides which bits are changed in the state | |
321 | * variable with the val parameter (second) to the callback. | |
322 | */ | |
bde68e60 | 323 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
806d9dd7 | 324 | { |
bde68e60 | 325 | return extcon_update_state(edev, 0xffffffff, state); |
806d9dd7 | 326 | } |
de55d871 MH |
327 | EXPORT_SYMBOL_GPL(extcon_set_state); |
328 | ||
806d9dd7 | 329 | /** |
2a9de9c0 | 330 | * extcon_get_cable_state_() - Get the status of a specific cable. |
806d9dd7 | 331 | * @edev: the extcon device that has the cable. |
2a9de9c0 | 332 | * @id: the unique id of each external connector in extcon enumeration. |
806d9dd7 | 333 | */ |
2a9de9c0 | 334 | int extcon_get_cable_state_(struct extcon_dev *edev, const enum extcon id) |
806d9dd7 | 335 | { |
2a9de9c0 | 336 | int index; |
806d9dd7 | 337 | |
2a9de9c0 CC |
338 | index = find_cable_index_by_id(edev, id); |
339 | if (index < 0) | |
340 | return index; | |
806d9dd7 | 341 | |
2a9de9c0 | 342 | if (edev->max_supported && edev->max_supported <= index) |
806d9dd7 MH |
343 | return -EINVAL; |
344 | ||
345 | return !!(edev->state & (1 << index)); | |
346 | } | |
347 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); | |
348 | ||
349 | /** | |
350 | * extcon_get_cable_state() - Get the status of a specific cable. | |
351 | * @edev: the extcon device that has the cable. | |
352 | * @cable_name: cable name. | |
353 | * | |
354 | * Note that this is slower than extcon_get_cable_state_. | |
355 | */ | |
356 | int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) | |
357 | { | |
2a9de9c0 | 358 | return extcon_get_cable_state_(edev, find_cable_index_by_name |
806d9dd7 MH |
359 | (edev, cable_name)); |
360 | } | |
361 | EXPORT_SYMBOL_GPL(extcon_get_cable_state); | |
362 | ||
363 | /** | |
909f9ec0 | 364 | * extcon_set_cable_state_() - Set the status of a specific cable. |
a75e1c73 | 365 | * @edev: the extcon device that has the cable. |
2a9de9c0 CC |
366 | * @id: the unique id of each external connector |
367 | * in extcon enumeration. | |
368 | * @state: the new cable status. The default semantics is | |
806d9dd7 MH |
369 | * true: attached / false: detached. |
370 | */ | |
2a9de9c0 CC |
371 | int extcon_set_cable_state_(struct extcon_dev *edev, enum extcon id, |
372 | bool cable_state) | |
806d9dd7 MH |
373 | { |
374 | u32 state; | |
2a9de9c0 | 375 | int index; |
806d9dd7 | 376 | |
2a9de9c0 CC |
377 | index = find_cable_index_by_id(edev, id); |
378 | if (index < 0) | |
379 | return index; | |
380 | ||
381 | if (edev->max_supported && edev->max_supported <= index) | |
806d9dd7 MH |
382 | return -EINVAL; |
383 | ||
384 | state = cable_state ? (1 << index) : 0; | |
bde68e60 | 385 | return extcon_update_state(edev, 1 << index, state); |
806d9dd7 MH |
386 | } |
387 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); | |
388 | ||
389 | /** | |
909f9ec0 | 390 | * extcon_set_cable_state() - Set the status of a specific cable. |
a75e1c73 CC |
391 | * @edev: the extcon device that has the cable. |
392 | * @cable_name: cable name. | |
806d9dd7 MH |
393 | * @cable_state: the new cable status. The default semantics is |
394 | * true: attached / false: detached. | |
395 | * | |
396 | * Note that this is slower than extcon_set_cable_state_. | |
397 | */ | |
398 | int extcon_set_cable_state(struct extcon_dev *edev, | |
399 | const char *cable_name, bool cable_state) | |
400 | { | |
2a9de9c0 | 401 | return extcon_set_cable_state_(edev, find_cable_index_by_name |
806d9dd7 MH |
402 | (edev, cable_name), cable_state); |
403 | } | |
404 | EXPORT_SYMBOL_GPL(extcon_set_cable_state); | |
405 | ||
74c5d09b DK |
406 | /** |
407 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
408 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
409 | */ | |
410 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
411 | { | |
412 | struct extcon_dev *sd; | |
413 | ||
414 | mutex_lock(&extcon_dev_list_lock); | |
415 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
416 | if (!strcmp(sd->name, extcon_name)) | |
417 | goto out; | |
418 | } | |
419 | sd = NULL; | |
420 | out: | |
421 | mutex_unlock(&extcon_dev_list_lock); | |
422 | return sd; | |
423 | } | |
424 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
425 | ||
806d9dd7 MH |
426 | static int _call_per_cable(struct notifier_block *nb, unsigned long val, |
427 | void *ptr) | |
428 | { | |
429 | struct extcon_specific_cable_nb *obj = container_of(nb, | |
430 | struct extcon_specific_cable_nb, internal_nb); | |
431 | struct extcon_dev *edev = ptr; | |
432 | ||
433 | if ((val & (1 << obj->cable_index)) != | |
434 | (edev->state & (1 << obj->cable_index))) { | |
f4cce696 CC |
435 | bool cable_state = true; |
436 | ||
806d9dd7 | 437 | obj->previous_value = val; |
f4cce696 CC |
438 | |
439 | if (val & (1 << obj->cable_index)) | |
440 | cable_state = false; | |
441 | ||
442 | return obj->user_nb->notifier_call(obj->user_nb, | |
443 | cable_state, ptr); | |
806d9dd7 MH |
444 | } |
445 | ||
446 | return NOTIFY_OK; | |
447 | } | |
448 | ||
449 | /** | |
450 | * extcon_register_interest() - Register a notifier for a state change of a | |
a75e1c73 CC |
451 | * specific cable, not an entier set of cables of a |
452 | * extcon device. | |
453 | * @obj: an empty extcon_specific_cable_nb object to be returned. | |
806d9dd7 | 454 | * @extcon_name: the name of extcon device. |
4f2de3bf JT |
455 | * if NULL, extcon_register_interest will register |
456 | * every cable with the target cable_name given. | |
806d9dd7 | 457 | * @cable_name: the target cable name. |
a75e1c73 | 458 | * @nb: the notifier block to get notified. |
806d9dd7 MH |
459 | * |
460 | * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets | |
461 | * the struct for you. | |
462 | * | |
463 | * extcon_register_interest is a helper function for those who want to get | |
464 | * notification for a single specific cable's status change. If a user wants | |
465 | * to get notification for any changes of all cables of a extcon device, | |
466 | * he/she should use the general extcon_register_notifier(). | |
467 | * | |
468 | * Note that the second parameter given to the callback of nb (val) is | |
469 | * "old_state", not the current state. The current state can be retrieved | |
470 | * by looking at the third pameter (edev pointer)'s state value. | |
471 | */ | |
472 | int extcon_register_interest(struct extcon_specific_cable_nb *obj, | |
473 | const char *extcon_name, const char *cable_name, | |
474 | struct notifier_block *nb) | |
475 | { | |
66bee35f HG |
476 | unsigned long flags; |
477 | int ret; | |
478 | ||
4f2de3bf | 479 | if (!obj || !cable_name || !nb) |
806d9dd7 MH |
480 | return -EINVAL; |
481 | ||
4f2de3bf JT |
482 | if (extcon_name) { |
483 | obj->edev = extcon_get_extcon_dev(extcon_name); | |
484 | if (!obj->edev) | |
485 | return -ENODEV; | |
806d9dd7 | 486 | |
2a9de9c0 CC |
487 | obj->cable_index = find_cable_index_by_name(obj->edev, |
488 | cable_name); | |
4f2de3bf | 489 | if (obj->cable_index < 0) |
c0c078c3 | 490 | return obj->cable_index; |
806d9dd7 | 491 | |
4f2de3bf | 492 | obj->user_nb = nb; |
806d9dd7 | 493 | |
4f2de3bf | 494 | obj->internal_nb.notifier_call = _call_per_cable; |
806d9dd7 | 495 | |
66bee35f HG |
496 | spin_lock_irqsave(&obj->edev->lock, flags); |
497 | ret = raw_notifier_chain_register(&obj->edev->nh, | |
c2275d2f | 498 | &obj->internal_nb); |
66bee35f | 499 | spin_unlock_irqrestore(&obj->edev->lock, flags); |
4f2de3bf JT |
500 | } else { |
501 | struct class_dev_iter iter; | |
502 | struct extcon_dev *extd; | |
503 | struct device *dev; | |
504 | ||
505 | if (!extcon_class) | |
506 | return -ENODEV; | |
507 | class_dev_iter_init(&iter, extcon_class, NULL, NULL); | |
508 | while ((dev = class_dev_iter_next(&iter))) { | |
cb8bb3a7 | 509 | extd = dev_get_drvdata(dev); |
4f2de3bf | 510 | |
2a9de9c0 | 511 | if (find_cable_index_by_name(extd, cable_name) < 0) |
4f2de3bf JT |
512 | continue; |
513 | ||
514 | class_dev_iter_exit(&iter); | |
515 | return extcon_register_interest(obj, extd->name, | |
516 | cable_name, nb); | |
517 | } | |
518 | ||
b9ec23c0 | 519 | ret = -ENODEV; |
4f2de3bf | 520 | } |
b9ec23c0 CC |
521 | |
522 | return ret; | |
806d9dd7 | 523 | } |
9c8a013a | 524 | EXPORT_SYMBOL_GPL(extcon_register_interest); |
806d9dd7 MH |
525 | |
526 | /** | |
527 | * extcon_unregister_interest() - Unregister the notifier registered by | |
a75e1c73 | 528 | * extcon_register_interest(). |
806d9dd7 MH |
529 | * @obj: the extcon_specific_cable_nb object returned by |
530 | * extcon_register_interest(). | |
531 | */ | |
532 | int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) | |
533 | { | |
66bee35f HG |
534 | unsigned long flags; |
535 | int ret; | |
536 | ||
806d9dd7 MH |
537 | if (!obj) |
538 | return -EINVAL; | |
539 | ||
66bee35f HG |
540 | spin_lock_irqsave(&obj->edev->lock, flags); |
541 | ret = raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); | |
542 | spin_unlock_irqrestore(&obj->edev->lock, flags); | |
543 | ||
544 | return ret; | |
806d9dd7 | 545 | } |
9c8a013a | 546 | EXPORT_SYMBOL_GPL(extcon_unregister_interest); |
806d9dd7 | 547 | |
74c5d09b | 548 | /** |
c338bb03 | 549 | * extcon_register_notifier() - Register a notifiee to get notified by |
a75e1c73 | 550 | * any attach status changes from the extcon. |
74c5d09b DK |
551 | * @edev: the extcon device. |
552 | * @nb: a notifier block to be registered. | |
806d9dd7 MH |
553 | * |
554 | * Note that the second parameter given to the callback of nb (val) is | |
555 | * "old_state", not the current state. The current state can be retrieved | |
556 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b DK |
557 | */ |
558 | int extcon_register_notifier(struct extcon_dev *edev, | |
559 | struct notifier_block *nb) | |
560 | { | |
66bee35f HG |
561 | unsigned long flags; |
562 | int ret; | |
563 | ||
564 | spin_lock_irqsave(&edev->lock, flags); | |
565 | ret = raw_notifier_chain_register(&edev->nh, nb); | |
566 | spin_unlock_irqrestore(&edev->lock, flags); | |
567 | ||
568 | return ret; | |
74c5d09b DK |
569 | } |
570 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
571 | ||
572 | /** | |
c338bb03 | 573 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
74c5d09b DK |
574 | * @edev: the extcon device. |
575 | * @nb: a registered notifier block to be unregistered. | |
576 | */ | |
577 | int extcon_unregister_notifier(struct extcon_dev *edev, | |
578 | struct notifier_block *nb) | |
579 | { | |
66bee35f HG |
580 | unsigned long flags; |
581 | int ret; | |
582 | ||
583 | spin_lock_irqsave(&edev->lock, flags); | |
584 | ret = raw_notifier_chain_unregister(&edev->nh, nb); | |
585 | spin_unlock_irqrestore(&edev->lock, flags); | |
586 | ||
587 | return ret; | |
74c5d09b DK |
588 | } |
589 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
590 | ||
af01da0e GKH |
591 | static struct attribute *extcon_attrs[] = { |
592 | &dev_attr_state.attr, | |
593 | &dev_attr_name.attr, | |
594 | NULL, | |
de55d871 | 595 | }; |
af01da0e | 596 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
597 | |
598 | static int create_extcon_class(void) | |
599 | { | |
600 | if (!extcon_class) { | |
601 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
602 | if (IS_ERR(extcon_class)) | |
603 | return PTR_ERR(extcon_class); | |
af01da0e | 604 | extcon_class->dev_groups = extcon_groups; |
de55d871 | 605 | |
449a2bf5 | 606 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
607 | switch_class = class_compat_register("switch"); |
608 | if (WARN(!switch_class, "cannot allocate")) | |
609 | return -ENOMEM; | |
449a2bf5 | 610 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
611 | } |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
de55d871 MH |
616 | static void extcon_dev_release(struct device *dev) |
617 | { | |
de55d871 MH |
618 | } |
619 | ||
bde68e60 | 620 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
621 | static void dummy_sysfs_dev_release(struct device *dev) |
622 | { | |
623 | } | |
624 | ||
a9af6522 CC |
625 | /* |
626 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
2a9de9c0 | 627 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
a9af6522 CC |
628 | * If supported_cable is NULL, cable name related APIs |
629 | * are disabled. | |
630 | * | |
631 | * This function allocates the memory for extcon device without allocating | |
632 | * memory in each extcon provider driver and initialize default setting for | |
633 | * extcon device. | |
634 | * | |
635 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail | |
636 | */ | |
2a9de9c0 | 637 | struct extcon_dev *extcon_dev_allocate(const enum extcon *supported_cable) |
a9af6522 CC |
638 | { |
639 | struct extcon_dev *edev; | |
640 | ||
641 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); | |
642 | if (!edev) | |
643 | return ERR_PTR(-ENOMEM); | |
644 | ||
645 | edev->max_supported = 0; | |
646 | edev->supported_cable = supported_cable; | |
647 | ||
648 | return edev; | |
649 | } | |
650 | ||
651 | /* | |
652 | * extcon_dev_free() - Free the memory of extcon device. | |
653 | * @edev: the extcon device to free | |
654 | */ | |
655 | void extcon_dev_free(struct extcon_dev *edev) | |
656 | { | |
657 | kfree(edev); | |
658 | } | |
659 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
660 | ||
739ba1bf CC |
661 | static int devm_extcon_dev_match(struct device *dev, void *res, void *data) |
662 | { | |
663 | struct extcon_dev **r = res; | |
664 | ||
665 | if (WARN_ON(!r || !*r)) | |
666 | return 0; | |
667 | ||
668 | return *r == data; | |
669 | } | |
670 | ||
671 | static void devm_extcon_dev_release(struct device *dev, void *res) | |
672 | { | |
673 | extcon_dev_free(*(struct extcon_dev **)res); | |
674 | } | |
675 | ||
676 | /** | |
677 | * devm_extcon_dev_allocate - Allocate managed extcon device | |
678 | * @dev: device owning the extcon device being created | |
2a9de9c0 | 679 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
739ba1bf CC |
680 | * If supported_cable is NULL, cable name related APIs |
681 | * are disabled. | |
682 | * | |
683 | * This function manages automatically the memory of extcon device using device | |
684 | * resource management and simplify the control of freeing the memory of extcon | |
685 | * device. | |
686 | * | |
687 | * Returns the pointer memory of allocated extcon_dev if success | |
688 | * or ERR_PTR(err) if fail | |
689 | */ | |
690 | struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, | |
2a9de9c0 | 691 | const enum extcon *supported_cable) |
739ba1bf CC |
692 | { |
693 | struct extcon_dev **ptr, *edev; | |
694 | ||
695 | ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); | |
696 | if (!ptr) | |
697 | return ERR_PTR(-ENOMEM); | |
698 | ||
699 | edev = extcon_dev_allocate(supported_cable); | |
700 | if (IS_ERR(edev)) { | |
701 | devres_free(ptr); | |
702 | return edev; | |
703 | } | |
704 | ||
ac65a625 CC |
705 | edev->dev.parent = dev; |
706 | ||
739ba1bf CC |
707 | *ptr = edev; |
708 | devres_add(dev, ptr); | |
709 | ||
710 | return edev; | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); | |
713 | ||
714 | void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) | |
715 | { | |
716 | WARN_ON(devres_release(dev, devm_extcon_dev_release, | |
717 | devm_extcon_dev_match, edev)); | |
718 | } | |
719 | EXPORT_SYMBOL_GPL(devm_extcon_dev_free); | |
720 | ||
de55d871 MH |
721 | /** |
722 | * extcon_dev_register() - Register a new extcon device | |
723 | * @edev : the new extcon device (should be allocated before calling) | |
de55d871 MH |
724 | * |
725 | * Among the members of edev struct, please set the "user initializing data" | |
726 | * in any case and set the "optional callbacks" if required. However, please | |
727 | * do not set the values of "internal data", which are initialized by | |
728 | * this function. | |
729 | */ | |
42d7d753 | 730 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 731 | { |
806d9dd7 | 732 | int ret, index = 0; |
71c3ffa5 | 733 | static atomic_t edev_no = ATOMIC_INIT(-1); |
de55d871 MH |
734 | |
735 | if (!extcon_class) { | |
736 | ret = create_extcon_class(); | |
737 | if (ret < 0) | |
738 | return ret; | |
739 | } | |
740 | ||
2a9de9c0 CC |
741 | if (!edev->supported_cable) |
742 | return -EINVAL; | |
743 | ||
744 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); | |
806d9dd7 | 745 | |
2a9de9c0 | 746 | edev->max_supported = index; |
806d9dd7 | 747 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
748 | dev_err(&edev->dev, |
749 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
750 | return -EINVAL; |
751 | } | |
752 | ||
dae61651 CC |
753 | edev->dev.class = extcon_class; |
754 | edev->dev.release = extcon_dev_release; | |
de55d871 | 755 | |
71c3ffa5 | 756 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
757 | if (IS_ERR_OR_NULL(edev->name)) { |
758 | dev_err(&edev->dev, | |
759 | "extcon device name is null\n"); | |
760 | return -EINVAL; | |
761 | } | |
71c3ffa5 CC |
762 | dev_set_name(&edev->dev, "extcon%lu", |
763 | (unsigned long)atomic_inc_return(&edev_no)); | |
806d9dd7 MH |
764 | |
765 | if (edev->max_supported) { | |
766 | char buf[10]; | |
767 | char *str; | |
768 | struct extcon_cable *cable; | |
769 | ||
770 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
771 | edev->max_supported, GFP_KERNEL); | |
772 | if (!edev->cables) { | |
773 | ret = -ENOMEM; | |
774 | goto err_sysfs_alloc; | |
775 | } | |
776 | for (index = 0; index < edev->max_supported; index++) { | |
777 | cable = &edev->cables[index]; | |
778 | ||
779 | snprintf(buf, 10, "cable.%d", index); | |
780 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
781 | GFP_KERNEL); | |
782 | if (!str) { | |
783 | for (index--; index >= 0; index--) { | |
784 | cable = &edev->cables[index]; | |
785 | kfree(cable->attr_g.name); | |
786 | } | |
787 | ret = -ENOMEM; | |
788 | ||
789 | goto err_alloc_cables; | |
790 | } | |
791 | strcpy(str, buf); | |
792 | ||
793 | cable->edev = edev; | |
794 | cable->cable_index = index; | |
795 | cable->attrs[0] = &cable->attr_name.attr; | |
796 | cable->attrs[1] = &cable->attr_state.attr; | |
797 | cable->attrs[2] = NULL; | |
798 | cable->attr_g.name = str; | |
799 | cable->attr_g.attrs = cable->attrs; | |
800 | ||
9baf3220 | 801 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
802 | cable->attr_name.attr.name = "name"; |
803 | cable->attr_name.attr.mode = 0444; | |
804 | cable->attr_name.show = cable_name_show; | |
805 | ||
9baf3220 | 806 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 807 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 808 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 809 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
810 | } |
811 | } | |
812 | ||
bde68e60 MH |
813 | if (edev->max_supported && edev->mutually_exclusive) { |
814 | char buf[80]; | |
815 | char *name; | |
816 | ||
817 | /* Count the size of mutually_exclusive array */ | |
818 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
819 | ; | |
820 | ||
821 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
822 | (index + 1), GFP_KERNEL); | |
823 | if (!edev->attrs_muex) { | |
824 | ret = -ENOMEM; | |
825 | goto err_muex; | |
826 | } | |
827 | ||
828 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
829 | index, GFP_KERNEL); | |
830 | if (!edev->d_attrs_muex) { | |
831 | ret = -ENOMEM; | |
832 | kfree(edev->attrs_muex); | |
833 | goto err_muex; | |
834 | } | |
835 | ||
836 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
837 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
838 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
839 | GFP_KERNEL); | |
840 | if (!name) { | |
841 | for (index--; index >= 0; index--) { | |
842 | kfree(edev->d_attrs_muex[index].attr. | |
843 | name); | |
844 | } | |
845 | kfree(edev->d_attrs_muex); | |
846 | kfree(edev->attrs_muex); | |
847 | ret = -ENOMEM; | |
848 | goto err_muex; | |
849 | } | |
850 | strcpy(name, buf); | |
9baf3220 | 851 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
852 | edev->d_attrs_muex[index].attr.name = name; |
853 | edev->d_attrs_muex[index].attr.mode = 0000; | |
854 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
855 | .attr; | |
856 | } | |
857 | edev->attr_g_muex.name = muex_name; | |
858 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
859 | ||
860 | } | |
861 | ||
806d9dd7 MH |
862 | if (edev->max_supported) { |
863 | edev->extcon_dev_type.groups = | |
864 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 865 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
866 | if (!edev->extcon_dev_type.groups) { |
867 | ret = -ENOMEM; | |
868 | goto err_alloc_groups; | |
869 | } | |
870 | ||
dae61651 | 871 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
872 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
873 | ||
874 | for (index = 0; index < edev->max_supported; index++) | |
875 | edev->extcon_dev_type.groups[index] = | |
876 | &edev->cables[index].attr_g; | |
bde68e60 MH |
877 | if (edev->mutually_exclusive) |
878 | edev->extcon_dev_type.groups[index] = | |
879 | &edev->attr_g_muex; | |
806d9dd7 | 880 | |
dae61651 | 881 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
882 | } |
883 | ||
dae61651 | 884 | ret = device_register(&edev->dev); |
de55d871 | 885 | if (ret) { |
dae61651 | 886 | put_device(&edev->dev); |
de55d871 MH |
887 | goto err_dev; |
888 | } | |
449a2bf5 | 889 | #if defined(CONFIG_ANDROID) |
de55d871 | 890 | if (switch_class) |
dae61651 | 891 | ret = class_compat_create_link(switch_class, &edev->dev, NULL); |
449a2bf5 | 892 | #endif /* CONFIG_ANDROID */ |
de55d871 | 893 | |
806d9dd7 MH |
894 | spin_lock_init(&edev->lock); |
895 | ||
74c5d09b DK |
896 | RAW_INIT_NOTIFIER_HEAD(&edev->nh); |
897 | ||
dae61651 | 898 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 899 | edev->state = 0; |
74c5d09b DK |
900 | |
901 | mutex_lock(&extcon_dev_list_lock); | |
902 | list_add(&edev->entry, &extcon_dev_list); | |
903 | mutex_unlock(&extcon_dev_list_lock); | |
904 | ||
de55d871 MH |
905 | return 0; |
906 | ||
907 | err_dev: | |
806d9dd7 MH |
908 | if (edev->max_supported) |
909 | kfree(edev->extcon_dev_type.groups); | |
910 | err_alloc_groups: | |
bde68e60 MH |
911 | if (edev->max_supported && edev->mutually_exclusive) { |
912 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
913 | kfree(edev->d_attrs_muex[index].attr.name); | |
914 | kfree(edev->d_attrs_muex); | |
915 | kfree(edev->attrs_muex); | |
916 | } | |
917 | err_muex: | |
806d9dd7 MH |
918 | for (index = 0; index < edev->max_supported; index++) |
919 | kfree(edev->cables[index].attr_g.name); | |
920 | err_alloc_cables: | |
921 | if (edev->max_supported) | |
922 | kfree(edev->cables); | |
923 | err_sysfs_alloc: | |
de55d871 MH |
924 | return ret; |
925 | } | |
926 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
927 | ||
928 | /** | |
929 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 930 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
931 | * |
932 | * Note that this does not call kfree(edev) because edev was not allocated | |
933 | * by this class. | |
934 | */ | |
935 | void extcon_dev_unregister(struct extcon_dev *edev) | |
936 | { | |
57e7cd37 | 937 | int index; |
938 | ||
939 | mutex_lock(&extcon_dev_list_lock); | |
940 | list_del(&edev->entry); | |
941 | mutex_unlock(&extcon_dev_list_lock); | |
942 | ||
dae61651 CC |
943 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
944 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
945 | dev_name(&edev->dev)); | |
57e7cd37 | 946 | return; |
947 | } | |
948 | ||
7585ca0d WX |
949 | device_unregister(&edev->dev); |
950 | ||
57e7cd37 | 951 | if (edev->mutually_exclusive && edev->max_supported) { |
952 | for (index = 0; edev->mutually_exclusive[index]; | |
953 | index++) | |
954 | kfree(edev->d_attrs_muex[index].attr.name); | |
955 | kfree(edev->d_attrs_muex); | |
956 | kfree(edev->attrs_muex); | |
957 | } | |
958 | ||
959 | for (index = 0; index < edev->max_supported; index++) | |
960 | kfree(edev->cables[index].attr_g.name); | |
961 | ||
962 | if (edev->max_supported) { | |
963 | kfree(edev->extcon_dev_type.groups); | |
964 | kfree(edev->cables); | |
965 | } | |
966 | ||
967 | #if defined(CONFIG_ANDROID) | |
968 | if (switch_class) | |
dae61651 | 969 | class_compat_remove_link(switch_class, &edev->dev, NULL); |
57e7cd37 | 970 | #endif |
dae61651 | 971 | put_device(&edev->dev); |
de55d871 MH |
972 | } |
973 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
974 | ||
1111244f SW |
975 | static void devm_extcon_dev_unreg(struct device *dev, void *res) |
976 | { | |
977 | extcon_dev_unregister(*(struct extcon_dev **)res); | |
978 | } | |
979 | ||
1111244f SW |
980 | /** |
981 | * devm_extcon_dev_register() - Resource-managed extcon_dev_register() | |
982 | * @dev: device to allocate extcon device | |
983 | * @edev: the new extcon device to register | |
984 | * | |
985 | * Managed extcon_dev_register() function. If extcon device is attached with | |
986 | * this function, that extcon device is automatically unregistered on driver | |
987 | * detach. Internally this function calls extcon_dev_register() function. | |
988 | * To get more information, refer that function. | |
989 | * | |
990 | * If extcon device is registered with this function and the device needs to be | |
991 | * unregistered separately, devm_extcon_dev_unregister() should be used. | |
992 | * | |
993 | * Returns 0 if success or negaive error number if failure. | |
994 | */ | |
995 | int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) | |
996 | { | |
997 | struct extcon_dev **ptr; | |
998 | int ret; | |
999 | ||
1000 | ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); | |
1001 | if (!ptr) | |
1002 | return -ENOMEM; | |
1003 | ||
1004 | ret = extcon_dev_register(edev); | |
1005 | if (ret) { | |
1006 | devres_free(ptr); | |
1007 | return ret; | |
1008 | } | |
1009 | ||
1010 | *ptr = edev; | |
1011 | devres_add(dev, ptr); | |
1012 | ||
1013 | return 0; | |
1014 | } | |
1015 | EXPORT_SYMBOL_GPL(devm_extcon_dev_register); | |
1016 | ||
1017 | /** | |
1018 | * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() | |
1019 | * @dev: device the extcon belongs to | |
1020 | * @edev: the extcon device to unregister | |
1021 | * | |
1022 | * Unregister extcon device that is registered with devm_extcon_dev_register() | |
1023 | * function. | |
1024 | */ | |
1025 | void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) | |
1026 | { | |
1027 | WARN_ON(devres_release(dev, devm_extcon_dev_unreg, | |
1028 | devm_extcon_dev_match, edev)); | |
1029 | } | |
1030 | EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); | |
1031 | ||
1ad94ffe CC |
1032 | #ifdef CONFIG_OF |
1033 | /* | |
1034 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree | |
1035 | * @dev - instance to the given device | |
1036 | * @index - index into list of extcon_dev | |
1037 | * | |
1038 | * return the instance of extcon device | |
1039 | */ | |
1040 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1041 | { | |
1042 | struct device_node *node; | |
1043 | struct extcon_dev *edev; | |
1044 | ||
1045 | if (!dev->of_node) { | |
1046 | dev_err(dev, "device does not have a device node entry\n"); | |
1047 | return ERR_PTR(-EINVAL); | |
1048 | } | |
1049 | ||
1050 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
1051 | if (!node) { | |
1052 | dev_err(dev, "failed to get phandle in %s node\n", | |
1053 | dev->of_node->full_name); | |
1054 | return ERR_PTR(-ENODEV); | |
1055 | } | |
1056 | ||
f841afb1 TF |
1057 | mutex_lock(&extcon_dev_list_lock); |
1058 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
1059 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
1060 | mutex_unlock(&extcon_dev_list_lock); | |
1061 | return edev; | |
1062 | } | |
1ad94ffe | 1063 | } |
f841afb1 | 1064 | mutex_unlock(&extcon_dev_list_lock); |
1ad94ffe | 1065 | |
f841afb1 | 1066 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
1067 | } |
1068 | #else | |
1069 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1070 | { | |
1071 | return ERR_PTR(-ENOSYS); | |
1072 | } | |
1073 | #endif /* CONFIG_OF */ | |
1074 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
1075 | ||
707d7550 CC |
1076 | /** |
1077 | * extcon_get_edev_name() - Get the name of the extcon device. | |
1078 | * @edev: the extcon device | |
1079 | */ | |
1080 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
1081 | { | |
1082 | return !edev ? NULL : edev->name; | |
1083 | } | |
1084 | ||
de55d871 MH |
1085 | static int __init extcon_class_init(void) |
1086 | { | |
1087 | return create_extcon_class(); | |
1088 | } | |
1089 | module_init(extcon_class_init); | |
1090 | ||
1091 | static void __exit extcon_class_exit(void) | |
1092 | { | |
0dc77b6d PH |
1093 | #if defined(CONFIG_ANDROID) |
1094 | class_compat_unregister(switch_class); | |
1095 | #endif | |
de55d871 MH |
1096 | class_destroy(extcon_class); |
1097 | } | |
1098 | module_exit(extcon_class_exit); | |
1099 | ||
2a9de9c0 | 1100 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 MH |
1101 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); |
1102 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
1103 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
1104 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
1105 | MODULE_LICENSE("GPL"); |