Commit | Line | Data |
---|---|---|
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[] = { | |
73b6ecdb CC |
42 | [EXTCON_NONE] = "NONE", |
43 | ||
8e9bc36d | 44 | /* USB external connector */ |
806d9dd7 | 45 | [EXTCON_USB] = "USB", |
8e9bc36d CC |
46 | [EXTCON_USB_HOST] = "USB-HOST", |
47 | ||
48 | /* Charger external connector */ | |
806d9dd7 | 49 | [EXTCON_TA] = "TA", |
8e9bc36d CC |
50 | [EXTCON_FAST_CHARGER] = "FAST-CHARGER", |
51 | [EXTCON_SLOW_CHARGER] = "SLOW-CHARGER", | |
52 | [EXTCON_CHARGE_DOWNSTREAM] = "CHARGE-DOWNSTREAM", | |
53 | ||
54 | /* Audio/Video external connector */ | |
55 | [EXTCON_LINE_IN] = "LINE-IN", | |
56 | [EXTCON_LINE_OUT] = "LINE-OUT", | |
57 | [EXTCON_MICROPHONE] = "MICROPHONE", | |
58 | [EXTCON_HEADPHONE] = "HEADPHONE", | |
59 | ||
806d9dd7 MH |
60 | [EXTCON_HDMI] = "HDMI", |
61 | [EXTCON_MHL] = "MHL", | |
62 | [EXTCON_DVI] = "DVI", | |
63 | [EXTCON_VGA] = "VGA", | |
8e9bc36d CC |
64 | [EXTCON_SPDIF_IN] = "SPDIF-IN", |
65 | [EXTCON_SPDIF_OUT] = "SPDIF-OUT", | |
66 | [EXTCON_VIDEO_IN] = "VIDEO-IN", | |
67 | [EXTCON_VIDEO_OUT] = "VIDEO-OUT", | |
68 | ||
69 | /* Etc external connector */ | |
70 | [EXTCON_DOCK] = "DOCK", | |
2a9de9c0 | 71 | [EXTCON_JIG] = "JIG", |
8e9bc36d CC |
72 | [EXTCON_MECHANICAL] = "MECHANICAL", |
73 | ||
2a9de9c0 | 74 | NULL, |
806d9dd7 MH |
75 | }; |
76 | ||
be3a07f7 | 77 | static struct class *extcon_class; |
449a2bf5 | 78 | #if defined(CONFIG_ANDROID) |
de55d871 | 79 | static struct class_compat *switch_class; |
449a2bf5 | 80 | #endif /* CONFIG_ANDROID */ |
de55d871 | 81 | |
74c5d09b DK |
82 | static LIST_HEAD(extcon_dev_list); |
83 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
84 | ||
bde68e60 MH |
85 | /** |
86 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
a75e1c73 | 87 | * condition. |
bde68e60 MH |
88 | * @edev: the extcon device |
89 | * @new_state: new cable attach status for @edev | |
90 | * | |
91 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
92 | * violated condition. | |
93 | */ | |
94 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
95 | { | |
96 | int i = 0; | |
97 | ||
98 | if (!edev->mutually_exclusive) | |
99 | return 0; | |
100 | ||
101 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 102 | int weight; |
bde68e60 | 103 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 104 | |
28c0ada6 | 105 | /* calculate the total number of bits set */ |
106 | weight = hweight32(correspondants); | |
107 | if (weight > 1) | |
108 | return i + 1; | |
bde68e60 MH |
109 | } |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
73b6ecdb | 114 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
2a9de9c0 CC |
115 | { |
116 | int i; | |
117 | ||
118 | /* Find the the index of extcon cable in edev->supported_cable */ | |
119 | for (i = 0; i < edev->max_supported; i++) { | |
120 | if (edev->supported_cable[i] == id) | |
121 | return i; | |
122 | } | |
123 | ||
124 | return -EINVAL; | |
125 | } | |
126 | ||
be052cc8 | 127 | static int find_cable_id_by_name(struct extcon_dev *edev, const char *name) |
2a9de9c0 | 128 | { |
a598af7f | 129 | int id = -EINVAL; |
73b6ecdb | 130 | int i = 0; |
2a9de9c0 | 131 | |
be052cc8 | 132 | /* Find the id of extcon cable */ |
73b6ecdb | 133 | while (extcon_name[i]) { |
2a9de9c0 CC |
134 | if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) { |
135 | id = i; | |
136 | break; | |
137 | } | |
be052cc8 | 138 | i++; |
2a9de9c0 CC |
139 | } |
140 | ||
be052cc8 RQ |
141 | return id; |
142 | } | |
143 | ||
144 | static int find_cable_index_by_name(struct extcon_dev *edev, const char *name) | |
145 | { | |
a598af7f | 146 | int id; |
be052cc8 RQ |
147 | |
148 | if (edev->max_supported == 0) | |
2a9de9c0 CC |
149 | return -EINVAL; |
150 | ||
be052cc8 RQ |
151 | /* Find the the number of extcon cable */ |
152 | id = find_cable_id_by_name(edev, name); | |
153 | if (id < 0) | |
154 | return id; | |
155 | ||
2a9de9c0 CC |
156 | return find_cable_index_by_id(edev, id); |
157 | } | |
158 | ||
046050f6 CC |
159 | static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached) |
160 | { | |
161 | if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) { | |
f4513b06 | 162 | *attached = ((new >> idx) & 0x1) ? true : false; |
046050f6 CC |
163 | return true; |
164 | } | |
165 | ||
166 | return false; | |
167 | } | |
168 | ||
de55d871 MH |
169 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
170 | char *buf) | |
171 | { | |
806d9dd7 | 172 | int i, count = 0; |
cb8bb3a7 | 173 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 174 | |
806d9dd7 MH |
175 | if (edev->max_supported == 0) |
176 | return sprintf(buf, "%u\n", edev->state); | |
177 | ||
2a9de9c0 | 178 | for (i = 0; i < edev->max_supported; i++) { |
806d9dd7 | 179 | count += sprintf(buf + count, "%s=%d\n", |
2a9de9c0 | 180 | extcon_name[edev->supported_cable[i]], |
806d9dd7 MH |
181 | !!(edev->state & (1 << i))); |
182 | } | |
183 | ||
184 | return count; | |
185 | } | |
186 | ||
806d9dd7 MH |
187 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
188 | const char *buf, size_t count) | |
189 | { | |
190 | u32 state; | |
191 | ssize_t ret = 0; | |
cb8bb3a7 | 192 | struct extcon_dev *edev = dev_get_drvdata(dev); |
806d9dd7 MH |
193 | |
194 | ret = sscanf(buf, "0x%x", &state); | |
195 | if (ret == 0) | |
196 | ret = -EINVAL; | |
197 | else | |
bde68e60 | 198 | ret = extcon_set_state(edev, state); |
806d9dd7 MH |
199 | |
200 | if (ret < 0) | |
201 | return ret; | |
202 | ||
203 | return count; | |
de55d871 | 204 | } |
af01da0e | 205 | static DEVICE_ATTR_RW(state); |
de55d871 MH |
206 | |
207 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
208 | char *buf) | |
209 | { | |
cb8bb3a7 | 210 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 211 | |
71c3ffa5 | 212 | return sprintf(buf, "%s\n", edev->name); |
de55d871 | 213 | } |
af01da0e | 214 | static DEVICE_ATTR_RO(name); |
de55d871 | 215 | |
806d9dd7 MH |
216 | static ssize_t cable_name_show(struct device *dev, |
217 | struct device_attribute *attr, char *buf) | |
218 | { | |
219 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
220 | attr_name); | |
2a9de9c0 | 221 | int i = cable->cable_index; |
806d9dd7 MH |
222 | |
223 | return sprintf(buf, "%s\n", | |
2a9de9c0 | 224 | extcon_name[cable->edev->supported_cable[i]]); |
806d9dd7 MH |
225 | } |
226 | ||
227 | static ssize_t cable_state_show(struct device *dev, | |
228 | struct device_attribute *attr, char *buf) | |
229 | { | |
230 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
231 | attr_state); | |
232 | ||
be052cc8 RQ |
233 | int i = cable->cable_index; |
234 | ||
806d9dd7 MH |
235 | return sprintf(buf, "%d\n", |
236 | extcon_get_cable_state_(cable->edev, | |
be052cc8 | 237 | cable->edev->supported_cable[i])); |
806d9dd7 MH |
238 | } |
239 | ||
de55d871 | 240 | /** |
806d9dd7 | 241 | * extcon_update_state() - Update the cable attach states of the extcon device |
a75e1c73 | 242 | * only for the masked bits. |
de55d871 | 243 | * @edev: the extcon device |
806d9dd7 | 244 | * @mask: the bit mask to designate updated bits. |
de55d871 MH |
245 | * @state: new cable attach status for @edev |
246 | * | |
247 | * Changing the state sends uevent with environment variable containing | |
248 | * the name of extcon device (envp[0]) and the state output (envp[1]). | |
249 | * Tizen uses this format for extcon device to get events from ports. | |
250 | * Android uses this format as well. | |
74c5d09b | 251 | * |
806d9dd7 MH |
252 | * Note that the notifier provides which bits are changed in the state |
253 | * variable with the val parameter (second) to the callback. | |
de55d871 | 254 | */ |
bde68e60 | 255 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
de55d871 MH |
256 | { |
257 | char name_buf[120]; | |
258 | char state_buf[120]; | |
259 | char *prop_buf; | |
260 | char *envp[3]; | |
261 | int env_offset = 0; | |
262 | int length; | |
046050f6 | 263 | int index; |
806d9dd7 | 264 | unsigned long flags; |
046050f6 | 265 | bool attached; |
de55d871 | 266 | |
7eae43ae CC |
267 | if (!edev) |
268 | return -EINVAL; | |
269 | ||
806d9dd7 | 270 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 271 | |
806d9dd7 | 272 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
f7a89811 RQ |
273 | u32 old_state; |
274 | ||
bde68e60 MH |
275 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
276 | (state & mask))) { | |
277 | spin_unlock_irqrestore(&edev->lock, flags); | |
278 | return -EPERM; | |
279 | } | |
280 | ||
f7a89811 | 281 | old_state = edev->state; |
806d9dd7 MH |
282 | edev->state &= ~mask; |
283 | edev->state |= state & mask; | |
284 | ||
f7a89811 RQ |
285 | for (index = 0; index < edev->max_supported; index++) { |
286 | if (is_extcon_changed(old_state, edev->state, index, | |
287 | &attached)) | |
288 | raw_notifier_call_chain(&edev->nh[index], | |
289 | attached, edev); | |
290 | } | |
291 | ||
806d9dd7 MH |
292 | /* This could be in interrupt handler */ |
293 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
de55d871 | 294 | if (prop_buf) { |
dae61651 | 295 | length = name_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
296 | if (length > 0) { |
297 | if (prop_buf[length - 1] == '\n') | |
298 | prop_buf[length - 1] = 0; | |
299 | snprintf(name_buf, sizeof(name_buf), | |
300 | "NAME=%s", prop_buf); | |
301 | envp[env_offset++] = name_buf; | |
302 | } | |
dae61651 | 303 | length = state_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
304 | if (length > 0) { |
305 | if (prop_buf[length - 1] == '\n') | |
306 | prop_buf[length - 1] = 0; | |
307 | snprintf(state_buf, sizeof(state_buf), | |
308 | "STATE=%s", prop_buf); | |
309 | envp[env_offset++] = state_buf; | |
310 | } | |
311 | envp[env_offset] = NULL; | |
806d9dd7 MH |
312 | /* Unlock early before uevent */ |
313 | spin_unlock_irqrestore(&edev->lock, flags); | |
314 | ||
dae61651 | 315 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); |
de55d871 MH |
316 | free_page((unsigned long)prop_buf); |
317 | } else { | |
806d9dd7 MH |
318 | /* Unlock early before uevent */ |
319 | spin_unlock_irqrestore(&edev->lock, flags); | |
320 | ||
dae61651 CC |
321 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); |
322 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
de55d871 | 323 | } |
806d9dd7 MH |
324 | } else { |
325 | /* No changes */ | |
326 | spin_unlock_irqrestore(&edev->lock, flags); | |
de55d871 | 327 | } |
bde68e60 MH |
328 | |
329 | return 0; | |
de55d871 | 330 | } |
806d9dd7 MH |
331 | EXPORT_SYMBOL_GPL(extcon_update_state); |
332 | ||
333 | /** | |
334 | * extcon_set_state() - Set the cable attach states of the extcon device. | |
335 | * @edev: the extcon device | |
336 | * @state: new cable attach status for @edev | |
337 | * | |
338 | * Note that notifier provides which bits are changed in the state | |
339 | * variable with the val parameter (second) to the callback. | |
340 | */ | |
bde68e60 | 341 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
806d9dd7 | 342 | { |
7eae43ae CC |
343 | if (!edev) |
344 | return -EINVAL; | |
345 | ||
bde68e60 | 346 | return extcon_update_state(edev, 0xffffffff, state); |
806d9dd7 | 347 | } |
de55d871 MH |
348 | EXPORT_SYMBOL_GPL(extcon_set_state); |
349 | ||
806d9dd7 | 350 | /** |
2a9de9c0 | 351 | * extcon_get_cable_state_() - Get the status of a specific cable. |
806d9dd7 | 352 | * @edev: the extcon device that has the cable. |
2a9de9c0 | 353 | * @id: the unique id of each external connector in extcon enumeration. |
806d9dd7 | 354 | */ |
73b6ecdb | 355 | int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id) |
806d9dd7 | 356 | { |
2a9de9c0 | 357 | int index; |
806d9dd7 | 358 | |
7eae43ae CC |
359 | if (!edev) |
360 | return -EINVAL; | |
361 | ||
2a9de9c0 CC |
362 | index = find_cable_index_by_id(edev, id); |
363 | if (index < 0) | |
364 | return index; | |
806d9dd7 | 365 | |
2a9de9c0 | 366 | if (edev->max_supported && edev->max_supported <= index) |
806d9dd7 MH |
367 | return -EINVAL; |
368 | ||
369 | return !!(edev->state & (1 << index)); | |
370 | } | |
371 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); | |
372 | ||
373 | /** | |
374 | * extcon_get_cable_state() - Get the status of a specific cable. | |
375 | * @edev: the extcon device that has the cable. | |
376 | * @cable_name: cable name. | |
377 | * | |
378 | * Note that this is slower than extcon_get_cable_state_. | |
379 | */ | |
380 | int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) | |
381 | { | |
a598af7f | 382 | int id; |
be052cc8 RQ |
383 | |
384 | id = find_cable_id_by_name(edev, cable_name); | |
385 | if (id < 0) | |
386 | return id; | |
387 | ||
388 | return extcon_get_cable_state_(edev, id); | |
806d9dd7 MH |
389 | } |
390 | EXPORT_SYMBOL_GPL(extcon_get_cable_state); | |
391 | ||
392 | /** | |
909f9ec0 | 393 | * extcon_set_cable_state_() - Set the status of a specific cable. |
a75e1c73 | 394 | * @edev: the extcon device that has the cable. |
2a9de9c0 CC |
395 | * @id: the unique id of each external connector |
396 | * in extcon enumeration. | |
397 | * @state: the new cable status. The default semantics is | |
806d9dd7 MH |
398 | * true: attached / false: detached. |
399 | */ | |
73b6ecdb | 400 | int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id, |
2a9de9c0 | 401 | bool cable_state) |
806d9dd7 MH |
402 | { |
403 | u32 state; | |
2a9de9c0 | 404 | int index; |
806d9dd7 | 405 | |
7eae43ae CC |
406 | if (!edev) |
407 | return -EINVAL; | |
408 | ||
2a9de9c0 CC |
409 | index = find_cable_index_by_id(edev, id); |
410 | if (index < 0) | |
411 | return index; | |
412 | ||
413 | if (edev->max_supported && edev->max_supported <= index) | |
806d9dd7 MH |
414 | return -EINVAL; |
415 | ||
416 | state = cable_state ? (1 << index) : 0; | |
bde68e60 | 417 | return extcon_update_state(edev, 1 << index, state); |
806d9dd7 MH |
418 | } |
419 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); | |
420 | ||
421 | /** | |
909f9ec0 | 422 | * extcon_set_cable_state() - Set the status of a specific cable. |
a75e1c73 CC |
423 | * @edev: the extcon device that has the cable. |
424 | * @cable_name: cable name. | |
806d9dd7 MH |
425 | * @cable_state: the new cable status. The default semantics is |
426 | * true: attached / false: detached. | |
427 | * | |
428 | * Note that this is slower than extcon_set_cable_state_. | |
429 | */ | |
430 | int extcon_set_cable_state(struct extcon_dev *edev, | |
431 | const char *cable_name, bool cable_state) | |
432 | { | |
a598af7f | 433 | int id; |
be052cc8 RQ |
434 | |
435 | id = find_cable_id_by_name(edev, cable_name); | |
436 | if (id < 0) | |
437 | return id; | |
438 | ||
439 | return extcon_set_cable_state_(edev, id, cable_state); | |
806d9dd7 MH |
440 | } |
441 | EXPORT_SYMBOL_GPL(extcon_set_cable_state); | |
442 | ||
74c5d09b DK |
443 | /** |
444 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
445 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
446 | */ | |
447 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
448 | { | |
449 | struct extcon_dev *sd; | |
450 | ||
7eae43ae CC |
451 | if (!extcon_name) |
452 | return ERR_PTR(-EINVAL); | |
453 | ||
74c5d09b DK |
454 | mutex_lock(&extcon_dev_list_lock); |
455 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
456 | if (!strcmp(sd->name, extcon_name)) | |
457 | goto out; | |
458 | } | |
459 | sd = NULL; | |
460 | out: | |
461 | mutex_unlock(&extcon_dev_list_lock); | |
462 | return sd; | |
463 | } | |
464 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
465 | ||
806d9dd7 MH |
466 | /** |
467 | * extcon_register_interest() - Register a notifier for a state change of a | |
a75e1c73 CC |
468 | * specific cable, not an entier set of cables of a |
469 | * extcon device. | |
470 | * @obj: an empty extcon_specific_cable_nb object to be returned. | |
806d9dd7 | 471 | * @extcon_name: the name of extcon device. |
4f2de3bf JT |
472 | * if NULL, extcon_register_interest will register |
473 | * every cable with the target cable_name given. | |
806d9dd7 | 474 | * @cable_name: the target cable name. |
a75e1c73 | 475 | * @nb: the notifier block to get notified. |
806d9dd7 MH |
476 | * |
477 | * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets | |
478 | * the struct for you. | |
479 | * | |
480 | * extcon_register_interest is a helper function for those who want to get | |
481 | * notification for a single specific cable's status change. If a user wants | |
482 | * to get notification for any changes of all cables of a extcon device, | |
483 | * he/she should use the general extcon_register_notifier(). | |
484 | * | |
485 | * Note that the second parameter given to the callback of nb (val) is | |
486 | * "old_state", not the current state. The current state can be retrieved | |
487 | * by looking at the third pameter (edev pointer)'s state value. | |
488 | */ | |
489 | int extcon_register_interest(struct extcon_specific_cable_nb *obj, | |
490 | const char *extcon_name, const char *cable_name, | |
491 | struct notifier_block *nb) | |
492 | { | |
66bee35f HG |
493 | unsigned long flags; |
494 | int ret; | |
495 | ||
4f2de3bf | 496 | if (!obj || !cable_name || !nb) |
806d9dd7 MH |
497 | return -EINVAL; |
498 | ||
4f2de3bf JT |
499 | if (extcon_name) { |
500 | obj->edev = extcon_get_extcon_dev(extcon_name); | |
501 | if (!obj->edev) | |
502 | return -ENODEV; | |
806d9dd7 | 503 | |
2a9de9c0 CC |
504 | obj->cable_index = find_cable_index_by_name(obj->edev, |
505 | cable_name); | |
4f2de3bf | 506 | if (obj->cable_index < 0) |
c0c078c3 | 507 | return obj->cable_index; |
806d9dd7 | 508 | |
4f2de3bf | 509 | obj->user_nb = nb; |
806d9dd7 | 510 | |
66bee35f | 511 | spin_lock_irqsave(&obj->edev->lock, flags); |
046050f6 CC |
512 | ret = raw_notifier_chain_register( |
513 | &obj->edev->nh[obj->cable_index], | |
514 | obj->user_nb); | |
66bee35f | 515 | spin_unlock_irqrestore(&obj->edev->lock, flags); |
4f2de3bf JT |
516 | } else { |
517 | struct class_dev_iter iter; | |
518 | struct extcon_dev *extd; | |
519 | struct device *dev; | |
520 | ||
521 | if (!extcon_class) | |
522 | return -ENODEV; | |
523 | class_dev_iter_init(&iter, extcon_class, NULL, NULL); | |
524 | while ((dev = class_dev_iter_next(&iter))) { | |
cb8bb3a7 | 525 | extd = dev_get_drvdata(dev); |
4f2de3bf | 526 | |
2a9de9c0 | 527 | if (find_cable_index_by_name(extd, cable_name) < 0) |
4f2de3bf JT |
528 | continue; |
529 | ||
530 | class_dev_iter_exit(&iter); | |
531 | return extcon_register_interest(obj, extd->name, | |
532 | cable_name, nb); | |
533 | } | |
534 | ||
b9ec23c0 | 535 | ret = -ENODEV; |
4f2de3bf | 536 | } |
b9ec23c0 CC |
537 | |
538 | return ret; | |
806d9dd7 | 539 | } |
9c8a013a | 540 | EXPORT_SYMBOL_GPL(extcon_register_interest); |
806d9dd7 MH |
541 | |
542 | /** | |
543 | * extcon_unregister_interest() - Unregister the notifier registered by | |
a75e1c73 | 544 | * extcon_register_interest(). |
806d9dd7 MH |
545 | * @obj: the extcon_specific_cable_nb object returned by |
546 | * extcon_register_interest(). | |
547 | */ | |
548 | int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) | |
549 | { | |
66bee35f HG |
550 | unsigned long flags; |
551 | int ret; | |
552 | ||
806d9dd7 MH |
553 | if (!obj) |
554 | return -EINVAL; | |
555 | ||
66bee35f | 556 | spin_lock_irqsave(&obj->edev->lock, flags); |
046050f6 CC |
557 | ret = raw_notifier_chain_unregister( |
558 | &obj->edev->nh[obj->cable_index], obj->user_nb); | |
66bee35f HG |
559 | spin_unlock_irqrestore(&obj->edev->lock, flags); |
560 | ||
561 | return ret; | |
806d9dd7 | 562 | } |
9c8a013a | 563 | EXPORT_SYMBOL_GPL(extcon_unregister_interest); |
806d9dd7 | 564 | |
74c5d09b | 565 | /** |
c338bb03 | 566 | * extcon_register_notifier() - Register a notifiee to get notified by |
a75e1c73 | 567 | * any attach status changes from the extcon. |
046050f6 CC |
568 | * @edev: the extcon device that has the external connecotr. |
569 | * @id: the unique id of each external connector in extcon enumeration. | |
74c5d09b | 570 | * @nb: a notifier block to be registered. |
806d9dd7 MH |
571 | * |
572 | * Note that the second parameter given to the callback of nb (val) is | |
573 | * "old_state", not the current state. The current state can be retrieved | |
574 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b | 575 | */ |
73b6ecdb | 576 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 577 | struct notifier_block *nb) |
74c5d09b | 578 | { |
66bee35f | 579 | unsigned long flags; |
046050f6 CC |
580 | int ret, idx; |
581 | ||
7eae43ae CC |
582 | if (!edev || !nb) |
583 | return -EINVAL; | |
584 | ||
046050f6 | 585 | idx = find_cable_index_by_id(edev, id); |
66bee35f HG |
586 | |
587 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 588 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); |
66bee35f HG |
589 | spin_unlock_irqrestore(&edev->lock, flags); |
590 | ||
591 | return ret; | |
74c5d09b DK |
592 | } |
593 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
594 | ||
595 | /** | |
c338bb03 | 596 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
046050f6 CC |
597 | * @edev: the extcon device that has the external connecotr. |
598 | * @id: the unique id of each external connector in extcon enumeration. | |
599 | * @nb: a notifier block to be registered. | |
74c5d09b | 600 | */ |
73b6ecdb | 601 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 602 | struct notifier_block *nb) |
74c5d09b | 603 | { |
66bee35f | 604 | unsigned long flags; |
046050f6 CC |
605 | int ret, idx; |
606 | ||
7eae43ae CC |
607 | if (!edev || !nb) |
608 | return -EINVAL; | |
609 | ||
046050f6 | 610 | idx = find_cable_index_by_id(edev, id); |
66bee35f HG |
611 | |
612 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 613 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
66bee35f HG |
614 | spin_unlock_irqrestore(&edev->lock, flags); |
615 | ||
616 | return ret; | |
74c5d09b DK |
617 | } |
618 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
619 | ||
af01da0e GKH |
620 | static struct attribute *extcon_attrs[] = { |
621 | &dev_attr_state.attr, | |
622 | &dev_attr_name.attr, | |
623 | NULL, | |
de55d871 | 624 | }; |
af01da0e | 625 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
626 | |
627 | static int create_extcon_class(void) | |
628 | { | |
629 | if (!extcon_class) { | |
630 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
631 | if (IS_ERR(extcon_class)) | |
632 | return PTR_ERR(extcon_class); | |
af01da0e | 633 | extcon_class->dev_groups = extcon_groups; |
de55d871 | 634 | |
449a2bf5 | 635 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
636 | switch_class = class_compat_register("switch"); |
637 | if (WARN(!switch_class, "cannot allocate")) | |
638 | return -ENOMEM; | |
449a2bf5 | 639 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
640 | } |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
de55d871 MH |
645 | static void extcon_dev_release(struct device *dev) |
646 | { | |
de55d871 MH |
647 | } |
648 | ||
bde68e60 | 649 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
650 | static void dummy_sysfs_dev_release(struct device *dev) |
651 | { | |
652 | } | |
653 | ||
a9af6522 CC |
654 | /* |
655 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
2a9de9c0 | 656 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
a9af6522 CC |
657 | * If supported_cable is NULL, cable name related APIs |
658 | * are disabled. | |
659 | * | |
660 | * This function allocates the memory for extcon device without allocating | |
661 | * memory in each extcon provider driver and initialize default setting for | |
662 | * extcon device. | |
663 | * | |
664 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail | |
665 | */ | |
73b6ecdb | 666 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
a9af6522 CC |
667 | { |
668 | struct extcon_dev *edev; | |
669 | ||
7eae43ae CC |
670 | if (!supported_cable) |
671 | return ERR_PTR(-EINVAL); | |
672 | ||
a9af6522 CC |
673 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
674 | if (!edev) | |
675 | return ERR_PTR(-ENOMEM); | |
676 | ||
677 | edev->max_supported = 0; | |
678 | edev->supported_cable = supported_cable; | |
679 | ||
680 | return edev; | |
681 | } | |
682 | ||
683 | /* | |
684 | * extcon_dev_free() - Free the memory of extcon device. | |
685 | * @edev: the extcon device to free | |
686 | */ | |
687 | void extcon_dev_free(struct extcon_dev *edev) | |
688 | { | |
689 | kfree(edev); | |
690 | } | |
691 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
692 | ||
739ba1bf CC |
693 | static int devm_extcon_dev_match(struct device *dev, void *res, void *data) |
694 | { | |
695 | struct extcon_dev **r = res; | |
696 | ||
697 | if (WARN_ON(!r || !*r)) | |
698 | return 0; | |
699 | ||
700 | return *r == data; | |
701 | } | |
702 | ||
703 | static void devm_extcon_dev_release(struct device *dev, void *res) | |
704 | { | |
705 | extcon_dev_free(*(struct extcon_dev **)res); | |
706 | } | |
707 | ||
708 | /** | |
709 | * devm_extcon_dev_allocate - Allocate managed extcon device | |
710 | * @dev: device owning the extcon device being created | |
2a9de9c0 | 711 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
739ba1bf CC |
712 | * If supported_cable is NULL, cable name related APIs |
713 | * are disabled. | |
714 | * | |
715 | * This function manages automatically the memory of extcon device using device | |
716 | * resource management and simplify the control of freeing the memory of extcon | |
717 | * device. | |
718 | * | |
719 | * Returns the pointer memory of allocated extcon_dev if success | |
720 | * or ERR_PTR(err) if fail | |
721 | */ | |
722 | struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, | |
73b6ecdb | 723 | const unsigned int *supported_cable) |
739ba1bf CC |
724 | { |
725 | struct extcon_dev **ptr, *edev; | |
726 | ||
727 | ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); | |
728 | if (!ptr) | |
729 | return ERR_PTR(-ENOMEM); | |
730 | ||
731 | edev = extcon_dev_allocate(supported_cable); | |
732 | if (IS_ERR(edev)) { | |
733 | devres_free(ptr); | |
734 | return edev; | |
735 | } | |
736 | ||
ac65a625 CC |
737 | edev->dev.parent = dev; |
738 | ||
739ba1bf CC |
739 | *ptr = edev; |
740 | devres_add(dev, ptr); | |
741 | ||
742 | return edev; | |
743 | } | |
744 | EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); | |
745 | ||
746 | void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) | |
747 | { | |
748 | WARN_ON(devres_release(dev, devm_extcon_dev_release, | |
749 | devm_extcon_dev_match, edev)); | |
750 | } | |
751 | EXPORT_SYMBOL_GPL(devm_extcon_dev_free); | |
752 | ||
de55d871 MH |
753 | /** |
754 | * extcon_dev_register() - Register a new extcon device | |
755 | * @edev : the new extcon device (should be allocated before calling) | |
de55d871 MH |
756 | * |
757 | * Among the members of edev struct, please set the "user initializing data" | |
758 | * in any case and set the "optional callbacks" if required. However, please | |
759 | * do not set the values of "internal data", which are initialized by | |
760 | * this function. | |
761 | */ | |
42d7d753 | 762 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 763 | { |
806d9dd7 | 764 | int ret, index = 0; |
71c3ffa5 | 765 | static atomic_t edev_no = ATOMIC_INIT(-1); |
de55d871 MH |
766 | |
767 | if (!extcon_class) { | |
768 | ret = create_extcon_class(); | |
769 | if (ret < 0) | |
770 | return ret; | |
771 | } | |
772 | ||
7eae43ae | 773 | if (!edev || !edev->supported_cable) |
2a9de9c0 CC |
774 | return -EINVAL; |
775 | ||
776 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); | |
806d9dd7 | 777 | |
2a9de9c0 | 778 | edev->max_supported = index; |
806d9dd7 | 779 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
780 | dev_err(&edev->dev, |
781 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
782 | return -EINVAL; |
783 | } | |
784 | ||
dae61651 CC |
785 | edev->dev.class = extcon_class; |
786 | edev->dev.release = extcon_dev_release; | |
de55d871 | 787 | |
71c3ffa5 | 788 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
789 | if (IS_ERR_OR_NULL(edev->name)) { |
790 | dev_err(&edev->dev, | |
791 | "extcon device name is null\n"); | |
792 | return -EINVAL; | |
793 | } | |
71c3ffa5 CC |
794 | dev_set_name(&edev->dev, "extcon%lu", |
795 | (unsigned long)atomic_inc_return(&edev_no)); | |
806d9dd7 MH |
796 | |
797 | if (edev->max_supported) { | |
798 | char buf[10]; | |
799 | char *str; | |
800 | struct extcon_cable *cable; | |
801 | ||
802 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
803 | edev->max_supported, GFP_KERNEL); | |
804 | if (!edev->cables) { | |
805 | ret = -ENOMEM; | |
806 | goto err_sysfs_alloc; | |
807 | } | |
808 | for (index = 0; index < edev->max_supported; index++) { | |
809 | cable = &edev->cables[index]; | |
810 | ||
811 | snprintf(buf, 10, "cable.%d", index); | |
812 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
813 | GFP_KERNEL); | |
814 | if (!str) { | |
815 | for (index--; index >= 0; index--) { | |
816 | cable = &edev->cables[index]; | |
817 | kfree(cable->attr_g.name); | |
818 | } | |
819 | ret = -ENOMEM; | |
820 | ||
821 | goto err_alloc_cables; | |
822 | } | |
823 | strcpy(str, buf); | |
824 | ||
825 | cable->edev = edev; | |
826 | cable->cable_index = index; | |
827 | cable->attrs[0] = &cable->attr_name.attr; | |
828 | cable->attrs[1] = &cable->attr_state.attr; | |
829 | cable->attrs[2] = NULL; | |
830 | cable->attr_g.name = str; | |
831 | cable->attr_g.attrs = cable->attrs; | |
832 | ||
9baf3220 | 833 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
834 | cable->attr_name.attr.name = "name"; |
835 | cable->attr_name.attr.mode = 0444; | |
836 | cable->attr_name.show = cable_name_show; | |
837 | ||
9baf3220 | 838 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 839 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 840 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 841 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
842 | } |
843 | } | |
844 | ||
bde68e60 MH |
845 | if (edev->max_supported && edev->mutually_exclusive) { |
846 | char buf[80]; | |
847 | char *name; | |
848 | ||
849 | /* Count the size of mutually_exclusive array */ | |
850 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
851 | ; | |
852 | ||
853 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
854 | (index + 1), GFP_KERNEL); | |
855 | if (!edev->attrs_muex) { | |
856 | ret = -ENOMEM; | |
857 | goto err_muex; | |
858 | } | |
859 | ||
860 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
861 | index, GFP_KERNEL); | |
862 | if (!edev->d_attrs_muex) { | |
863 | ret = -ENOMEM; | |
864 | kfree(edev->attrs_muex); | |
865 | goto err_muex; | |
866 | } | |
867 | ||
868 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
869 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
870 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
871 | GFP_KERNEL); | |
872 | if (!name) { | |
873 | for (index--; index >= 0; index--) { | |
874 | kfree(edev->d_attrs_muex[index].attr. | |
875 | name); | |
876 | } | |
877 | kfree(edev->d_attrs_muex); | |
878 | kfree(edev->attrs_muex); | |
879 | ret = -ENOMEM; | |
880 | goto err_muex; | |
881 | } | |
882 | strcpy(name, buf); | |
9baf3220 | 883 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
884 | edev->d_attrs_muex[index].attr.name = name; |
885 | edev->d_attrs_muex[index].attr.mode = 0000; | |
886 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
887 | .attr; | |
888 | } | |
889 | edev->attr_g_muex.name = muex_name; | |
890 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
891 | ||
892 | } | |
893 | ||
806d9dd7 MH |
894 | if (edev->max_supported) { |
895 | edev->extcon_dev_type.groups = | |
896 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 897 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
898 | if (!edev->extcon_dev_type.groups) { |
899 | ret = -ENOMEM; | |
900 | goto err_alloc_groups; | |
901 | } | |
902 | ||
dae61651 | 903 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
904 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
905 | ||
906 | for (index = 0; index < edev->max_supported; index++) | |
907 | edev->extcon_dev_type.groups[index] = | |
908 | &edev->cables[index].attr_g; | |
bde68e60 MH |
909 | if (edev->mutually_exclusive) |
910 | edev->extcon_dev_type.groups[index] = | |
911 | &edev->attr_g_muex; | |
806d9dd7 | 912 | |
dae61651 | 913 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
914 | } |
915 | ||
dae61651 | 916 | ret = device_register(&edev->dev); |
de55d871 | 917 | if (ret) { |
dae61651 | 918 | put_device(&edev->dev); |
de55d871 MH |
919 | goto err_dev; |
920 | } | |
449a2bf5 | 921 | #if defined(CONFIG_ANDROID) |
de55d871 | 922 | if (switch_class) |
dae61651 | 923 | ret = class_compat_create_link(switch_class, &edev->dev, NULL); |
449a2bf5 | 924 | #endif /* CONFIG_ANDROID */ |
de55d871 | 925 | |
806d9dd7 MH |
926 | spin_lock_init(&edev->lock); |
927 | ||
046050f6 CC |
928 | edev->nh = devm_kzalloc(&edev->dev, |
929 | sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL); | |
930 | if (!edev->nh) { | |
931 | ret = -ENOMEM; | |
932 | goto err_dev; | |
933 | } | |
934 | ||
935 | for (index = 0; index < edev->max_supported; index++) | |
936 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); | |
74c5d09b | 937 | |
dae61651 | 938 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 939 | edev->state = 0; |
74c5d09b DK |
940 | |
941 | mutex_lock(&extcon_dev_list_lock); | |
942 | list_add(&edev->entry, &extcon_dev_list); | |
943 | mutex_unlock(&extcon_dev_list_lock); | |
944 | ||
de55d871 MH |
945 | return 0; |
946 | ||
947 | err_dev: | |
806d9dd7 MH |
948 | if (edev->max_supported) |
949 | kfree(edev->extcon_dev_type.groups); | |
950 | err_alloc_groups: | |
bde68e60 MH |
951 | if (edev->max_supported && edev->mutually_exclusive) { |
952 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
953 | kfree(edev->d_attrs_muex[index].attr.name); | |
954 | kfree(edev->d_attrs_muex); | |
955 | kfree(edev->attrs_muex); | |
956 | } | |
957 | err_muex: | |
806d9dd7 MH |
958 | for (index = 0; index < edev->max_supported; index++) |
959 | kfree(edev->cables[index].attr_g.name); | |
960 | err_alloc_cables: | |
961 | if (edev->max_supported) | |
962 | kfree(edev->cables); | |
963 | err_sysfs_alloc: | |
de55d871 MH |
964 | return ret; |
965 | } | |
966 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
967 | ||
968 | /** | |
969 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 970 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
971 | * |
972 | * Note that this does not call kfree(edev) because edev was not allocated | |
973 | * by this class. | |
974 | */ | |
975 | void extcon_dev_unregister(struct extcon_dev *edev) | |
976 | { | |
57e7cd37 | 977 | int index; |
978 | ||
7eae43ae CC |
979 | if (!edev) |
980 | return; | |
981 | ||
57e7cd37 | 982 | mutex_lock(&extcon_dev_list_lock); |
983 | list_del(&edev->entry); | |
984 | mutex_unlock(&extcon_dev_list_lock); | |
985 | ||
dae61651 CC |
986 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
987 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
988 | dev_name(&edev->dev)); | |
57e7cd37 | 989 | return; |
990 | } | |
991 | ||
7585ca0d WX |
992 | device_unregister(&edev->dev); |
993 | ||
57e7cd37 | 994 | if (edev->mutually_exclusive && edev->max_supported) { |
995 | for (index = 0; edev->mutually_exclusive[index]; | |
996 | index++) | |
997 | kfree(edev->d_attrs_muex[index].attr.name); | |
998 | kfree(edev->d_attrs_muex); | |
999 | kfree(edev->attrs_muex); | |
1000 | } | |
1001 | ||
1002 | for (index = 0; index < edev->max_supported; index++) | |
1003 | kfree(edev->cables[index].attr_g.name); | |
1004 | ||
1005 | if (edev->max_supported) { | |
1006 | kfree(edev->extcon_dev_type.groups); | |
1007 | kfree(edev->cables); | |
1008 | } | |
1009 | ||
1010 | #if defined(CONFIG_ANDROID) | |
1011 | if (switch_class) | |
dae61651 | 1012 | class_compat_remove_link(switch_class, &edev->dev, NULL); |
57e7cd37 | 1013 | #endif |
dae61651 | 1014 | put_device(&edev->dev); |
de55d871 MH |
1015 | } |
1016 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
1017 | ||
1111244f SW |
1018 | static void devm_extcon_dev_unreg(struct device *dev, void *res) |
1019 | { | |
1020 | extcon_dev_unregister(*(struct extcon_dev **)res); | |
1021 | } | |
1022 | ||
1111244f SW |
1023 | /** |
1024 | * devm_extcon_dev_register() - Resource-managed extcon_dev_register() | |
1025 | * @dev: device to allocate extcon device | |
1026 | * @edev: the new extcon device to register | |
1027 | * | |
1028 | * Managed extcon_dev_register() function. If extcon device is attached with | |
1029 | * this function, that extcon device is automatically unregistered on driver | |
1030 | * detach. Internally this function calls extcon_dev_register() function. | |
1031 | * To get more information, refer that function. | |
1032 | * | |
1033 | * If extcon device is registered with this function and the device needs to be | |
1034 | * unregistered separately, devm_extcon_dev_unregister() should be used. | |
1035 | * | |
1036 | * Returns 0 if success or negaive error number if failure. | |
1037 | */ | |
1038 | int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) | |
1039 | { | |
1040 | struct extcon_dev **ptr; | |
1041 | int ret; | |
1042 | ||
1043 | ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); | |
1044 | if (!ptr) | |
1045 | return -ENOMEM; | |
1046 | ||
1047 | ret = extcon_dev_register(edev); | |
1048 | if (ret) { | |
1049 | devres_free(ptr); | |
1050 | return ret; | |
1051 | } | |
1052 | ||
1053 | *ptr = edev; | |
1054 | devres_add(dev, ptr); | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | EXPORT_SYMBOL_GPL(devm_extcon_dev_register); | |
1059 | ||
1060 | /** | |
1061 | * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() | |
1062 | * @dev: device the extcon belongs to | |
1063 | * @edev: the extcon device to unregister | |
1064 | * | |
1065 | * Unregister extcon device that is registered with devm_extcon_dev_register() | |
1066 | * function. | |
1067 | */ | |
1068 | void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) | |
1069 | { | |
1070 | WARN_ON(devres_release(dev, devm_extcon_dev_unreg, | |
1071 | devm_extcon_dev_match, edev)); | |
1072 | } | |
1073 | EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); | |
1074 | ||
1ad94ffe CC |
1075 | #ifdef CONFIG_OF |
1076 | /* | |
1077 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree | |
1078 | * @dev - instance to the given device | |
1079 | * @index - index into list of extcon_dev | |
1080 | * | |
1081 | * return the instance of extcon device | |
1082 | */ | |
1083 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1084 | { | |
1085 | struct device_node *node; | |
1086 | struct extcon_dev *edev; | |
1087 | ||
7eae43ae CC |
1088 | if (!dev) |
1089 | return ERR_PTR(-EINVAL); | |
1090 | ||
1ad94ffe CC |
1091 | if (!dev->of_node) { |
1092 | dev_err(dev, "device does not have a device node entry\n"); | |
1093 | return ERR_PTR(-EINVAL); | |
1094 | } | |
1095 | ||
1096 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
1097 | if (!node) { | |
1098 | dev_err(dev, "failed to get phandle in %s node\n", | |
1099 | dev->of_node->full_name); | |
1100 | return ERR_PTR(-ENODEV); | |
1101 | } | |
1102 | ||
f841afb1 TF |
1103 | mutex_lock(&extcon_dev_list_lock); |
1104 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
1105 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
1106 | mutex_unlock(&extcon_dev_list_lock); | |
1107 | return edev; | |
1108 | } | |
1ad94ffe | 1109 | } |
f841afb1 | 1110 | mutex_unlock(&extcon_dev_list_lock); |
1ad94ffe | 1111 | |
f841afb1 | 1112 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
1113 | } |
1114 | #else | |
1115 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1116 | { | |
1117 | return ERR_PTR(-ENOSYS); | |
1118 | } | |
1119 | #endif /* CONFIG_OF */ | |
1120 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
1121 | ||
707d7550 CC |
1122 | /** |
1123 | * extcon_get_edev_name() - Get the name of the extcon device. | |
1124 | * @edev: the extcon device | |
1125 | */ | |
1126 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
1127 | { | |
1128 | return !edev ? NULL : edev->name; | |
1129 | } | |
1130 | ||
de55d871 MH |
1131 | static int __init extcon_class_init(void) |
1132 | { | |
1133 | return create_extcon_class(); | |
1134 | } | |
1135 | module_init(extcon_class_init); | |
1136 | ||
1137 | static void __exit extcon_class_exit(void) | |
1138 | { | |
0dc77b6d PH |
1139 | #if defined(CONFIG_ANDROID) |
1140 | class_compat_unregister(switch_class); | |
1141 | #endif | |
de55d871 MH |
1142 | class_destroy(extcon_class); |
1143 | } | |
1144 | module_exit(extcon_class_exit); | |
1145 | ||
2a9de9c0 | 1146 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 MH |
1147 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); |
1148 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
1149 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
1150 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
1151 | MODULE_LICENSE("GPL"); |