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