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[] = { | |
11eecf91 | 42 | [EXTCON_NONE] = "NONE", |
73b6ecdb | 43 | |
8e9bc36d | 44 | /* USB external connector */ |
11eecf91 CC |
45 | [EXTCON_USB] = "USB", |
46 | [EXTCON_USB_HOST] = "USB-HOST", | |
8e9bc36d | 47 | |
11eecf91 CC |
48 | /* Charging external connector */ |
49 | [EXTCON_CHG_USB_SDP] = "SDP", | |
50 | [EXTCON_CHG_USB_DCP] = "DCP", | |
51 | [EXTCON_CHG_USB_CDP] = "CDP", | |
52 | [EXTCON_CHG_USB_ACA] = "ACA", | |
53 | [EXTCON_CHG_USB_FAST] = "FAST-CHARGER", | |
54 | [EXTCON_CHG_USB_SLOW] = "SLOW-CHARGER", | |
8e9bc36d | 55 | |
11eecf91 CC |
56 | /* Jack external connector */ |
57 | [EXTCON_JACK_MICROPHONE] = "MICROPHONE", | |
58 | [EXTCON_JACK_HEADPHONE] = "HEADPHONE", | |
59 | [EXTCON_JACK_LINE_IN] = "LINE-IN", | |
60 | [EXTCON_JACK_LINE_OUT] = "LINE-OUT", | |
61 | [EXTCON_JACK_VIDEO_IN] = "VIDEO-IN", | |
62 | [EXTCON_JACK_VIDEO_OUT] = "VIDEO-OUT", | |
63 | [EXTCON_JACK_SPDIF_IN] = "SPDIF-IN", | |
64 | [EXTCON_JACK_SPDIF_OUT] = "SPDIF-OUT", | |
8e9bc36d | 65 | |
11eecf91 CC |
66 | /* Display external connector */ |
67 | [EXTCON_DISP_HDMI] = "HDMI", | |
68 | [EXTCON_DISP_MHL] = "MHL", | |
69 | [EXTCON_DISP_DVI] = "DVI", | |
70 | [EXTCON_DISP_VGA] = "VGA", | |
8e9bc36d | 71 | |
11eecf91 CC |
72 | /* Miscellaneous external connector */ |
73 | [EXTCON_DOCK] = "DOCK", | |
74 | [EXTCON_JIG] = "JIG", | |
75 | [EXTCON_MECHANICAL] = "MECHANICAL", | |
8e9bc36d | 76 | |
2a9de9c0 | 77 | NULL, |
806d9dd7 MH |
78 | }; |
79 | ||
be3a07f7 | 80 | static struct class *extcon_class; |
449a2bf5 | 81 | #if defined(CONFIG_ANDROID) |
de55d871 | 82 | static struct class_compat *switch_class; |
449a2bf5 | 83 | #endif /* CONFIG_ANDROID */ |
de55d871 | 84 | |
74c5d09b DK |
85 | static LIST_HEAD(extcon_dev_list); |
86 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
87 | ||
bde68e60 MH |
88 | /** |
89 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
a75e1c73 | 90 | * condition. |
bde68e60 MH |
91 | * @edev: the extcon device |
92 | * @new_state: new cable attach status for @edev | |
93 | * | |
94 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
95 | * violated condition. | |
96 | */ | |
97 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
98 | { | |
99 | int i = 0; | |
100 | ||
101 | if (!edev->mutually_exclusive) | |
102 | return 0; | |
103 | ||
104 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 105 | int weight; |
bde68e60 | 106 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 107 | |
28c0ada6 | 108 | /* calculate the total number of bits set */ |
109 | weight = hweight32(correspondants); | |
110 | if (weight > 1) | |
111 | return i + 1; | |
bde68e60 MH |
112 | } |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
73b6ecdb | 117 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
2a9de9c0 CC |
118 | { |
119 | int i; | |
120 | ||
121 | /* Find the the index of extcon cable in edev->supported_cable */ | |
122 | for (i = 0; i < edev->max_supported; i++) { | |
123 | if (edev->supported_cable[i] == id) | |
124 | return i; | |
125 | } | |
126 | ||
127 | return -EINVAL; | |
128 | } | |
129 | ||
be052cc8 | 130 | static int find_cable_id_by_name(struct extcon_dev *edev, const char *name) |
2a9de9c0 | 131 | { |
a598af7f | 132 | int id = -EINVAL; |
73b6ecdb | 133 | int i = 0; |
2a9de9c0 | 134 | |
be052cc8 | 135 | /* Find the id of extcon cable */ |
73b6ecdb | 136 | while (extcon_name[i]) { |
2a9de9c0 CC |
137 | if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) { |
138 | id = i; | |
139 | break; | |
140 | } | |
be052cc8 | 141 | i++; |
2a9de9c0 CC |
142 | } |
143 | ||
be052cc8 RQ |
144 | return id; |
145 | } | |
146 | ||
147 | static int find_cable_index_by_name(struct extcon_dev *edev, const char *name) | |
148 | { | |
a598af7f | 149 | int id; |
be052cc8 RQ |
150 | |
151 | if (edev->max_supported == 0) | |
2a9de9c0 CC |
152 | return -EINVAL; |
153 | ||
be052cc8 RQ |
154 | /* Find the the number of extcon cable */ |
155 | id = find_cable_id_by_name(edev, name); | |
156 | if (id < 0) | |
157 | return id; | |
158 | ||
2a9de9c0 CC |
159 | return find_cable_index_by_id(edev, id); |
160 | } | |
161 | ||
046050f6 CC |
162 | static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached) |
163 | { | |
164 | if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) { | |
f4513b06 | 165 | *attached = ((new >> idx) & 0x1) ? true : false; |
046050f6 CC |
166 | return true; |
167 | } | |
168 | ||
169 | return false; | |
170 | } | |
171 | ||
de55d871 MH |
172 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
173 | char *buf) | |
174 | { | |
806d9dd7 | 175 | int i, count = 0; |
cb8bb3a7 | 176 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 177 | |
806d9dd7 MH |
178 | if (edev->max_supported == 0) |
179 | return sprintf(buf, "%u\n", edev->state); | |
180 | ||
2a9de9c0 | 181 | for (i = 0; i < edev->max_supported; i++) { |
806d9dd7 | 182 | count += sprintf(buf + count, "%s=%d\n", |
2a9de9c0 | 183 | extcon_name[edev->supported_cable[i]], |
806d9dd7 MH |
184 | !!(edev->state & (1 << i))); |
185 | } | |
186 | ||
187 | return count; | |
188 | } | |
189 | ||
806d9dd7 MH |
190 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
191 | const char *buf, size_t count) | |
192 | { | |
193 | u32 state; | |
194 | ssize_t ret = 0; | |
cb8bb3a7 | 195 | struct extcon_dev *edev = dev_get_drvdata(dev); |
806d9dd7 MH |
196 | |
197 | ret = sscanf(buf, "0x%x", &state); | |
198 | if (ret == 0) | |
199 | ret = -EINVAL; | |
200 | else | |
bde68e60 | 201 | ret = extcon_set_state(edev, state); |
806d9dd7 MH |
202 | |
203 | if (ret < 0) | |
204 | return ret; | |
205 | ||
206 | return count; | |
de55d871 | 207 | } |
af01da0e | 208 | static DEVICE_ATTR_RW(state); |
de55d871 MH |
209 | |
210 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
211 | char *buf) | |
212 | { | |
cb8bb3a7 | 213 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 214 | |
71c3ffa5 | 215 | return sprintf(buf, "%s\n", edev->name); |
de55d871 | 216 | } |
af01da0e | 217 | static DEVICE_ATTR_RO(name); |
de55d871 | 218 | |
806d9dd7 MH |
219 | static ssize_t cable_name_show(struct device *dev, |
220 | struct device_attribute *attr, char *buf) | |
221 | { | |
222 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
223 | attr_name); | |
2a9de9c0 | 224 | int i = cable->cable_index; |
806d9dd7 MH |
225 | |
226 | return sprintf(buf, "%s\n", | |
2a9de9c0 | 227 | extcon_name[cable->edev->supported_cable[i]]); |
806d9dd7 MH |
228 | } |
229 | ||
230 | static ssize_t cable_state_show(struct device *dev, | |
231 | struct device_attribute *attr, char *buf) | |
232 | { | |
233 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
234 | attr_state); | |
235 | ||
be052cc8 RQ |
236 | int i = cable->cable_index; |
237 | ||
806d9dd7 MH |
238 | return sprintf(buf, "%d\n", |
239 | extcon_get_cable_state_(cable->edev, | |
be052cc8 | 240 | cable->edev->supported_cable[i])); |
806d9dd7 MH |
241 | } |
242 | ||
de55d871 | 243 | /** |
806d9dd7 | 244 | * extcon_update_state() - Update the cable attach states of the extcon device |
a75e1c73 | 245 | * only for the masked bits. |
de55d871 | 246 | * @edev: the extcon device |
806d9dd7 | 247 | * @mask: the bit mask to designate updated bits. |
de55d871 MH |
248 | * @state: new cable attach status for @edev |
249 | * | |
250 | * Changing the state sends uevent with environment variable containing | |
251 | * the name of extcon device (envp[0]) and the state output (envp[1]). | |
252 | * Tizen uses this format for extcon device to get events from ports. | |
253 | * Android uses this format as well. | |
74c5d09b | 254 | * |
806d9dd7 MH |
255 | * Note that the notifier provides which bits are changed in the state |
256 | * variable with the val parameter (second) to the callback. | |
de55d871 | 257 | */ |
bde68e60 | 258 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
de55d871 MH |
259 | { |
260 | char name_buf[120]; | |
261 | char state_buf[120]; | |
262 | char *prop_buf; | |
263 | char *envp[3]; | |
264 | int env_offset = 0; | |
265 | int length; | |
046050f6 | 266 | int index; |
806d9dd7 | 267 | unsigned long flags; |
046050f6 | 268 | bool attached; |
de55d871 | 269 | |
7eae43ae CC |
270 | if (!edev) |
271 | return -EINVAL; | |
272 | ||
806d9dd7 | 273 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 274 | |
806d9dd7 | 275 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
f7a89811 RQ |
276 | u32 old_state; |
277 | ||
bde68e60 MH |
278 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
279 | (state & mask))) { | |
280 | spin_unlock_irqrestore(&edev->lock, flags); | |
281 | return -EPERM; | |
282 | } | |
283 | ||
f7a89811 | 284 | old_state = edev->state; |
806d9dd7 MH |
285 | edev->state &= ~mask; |
286 | edev->state |= state & mask; | |
287 | ||
f7a89811 RQ |
288 | for (index = 0; index < edev->max_supported; index++) { |
289 | if (is_extcon_changed(old_state, edev->state, index, | |
290 | &attached)) | |
291 | raw_notifier_call_chain(&edev->nh[index], | |
292 | attached, edev); | |
293 | } | |
294 | ||
806d9dd7 MH |
295 | /* This could be in interrupt handler */ |
296 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
de55d871 | 297 | if (prop_buf) { |
dae61651 | 298 | length = name_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
299 | if (length > 0) { |
300 | if (prop_buf[length - 1] == '\n') | |
301 | prop_buf[length - 1] = 0; | |
302 | snprintf(name_buf, sizeof(name_buf), | |
303 | "NAME=%s", prop_buf); | |
304 | envp[env_offset++] = name_buf; | |
305 | } | |
dae61651 | 306 | length = state_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
307 | if (length > 0) { |
308 | if (prop_buf[length - 1] == '\n') | |
309 | prop_buf[length - 1] = 0; | |
310 | snprintf(state_buf, sizeof(state_buf), | |
311 | "STATE=%s", prop_buf); | |
312 | envp[env_offset++] = state_buf; | |
313 | } | |
314 | envp[env_offset] = NULL; | |
806d9dd7 MH |
315 | /* Unlock early before uevent */ |
316 | spin_unlock_irqrestore(&edev->lock, flags); | |
317 | ||
dae61651 | 318 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); |
de55d871 MH |
319 | free_page((unsigned long)prop_buf); |
320 | } else { | |
806d9dd7 MH |
321 | /* Unlock early before uevent */ |
322 | spin_unlock_irqrestore(&edev->lock, flags); | |
323 | ||
dae61651 CC |
324 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); |
325 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
de55d871 | 326 | } |
806d9dd7 MH |
327 | } else { |
328 | /* No changes */ | |
329 | spin_unlock_irqrestore(&edev->lock, flags); | |
de55d871 | 330 | } |
bde68e60 MH |
331 | |
332 | return 0; | |
de55d871 | 333 | } |
806d9dd7 MH |
334 | EXPORT_SYMBOL_GPL(extcon_update_state); |
335 | ||
336 | /** | |
337 | * extcon_set_state() - Set the cable attach states of the extcon device. | |
338 | * @edev: the extcon device | |
339 | * @state: new cable attach status for @edev | |
340 | * | |
341 | * Note that notifier provides which bits are changed in the state | |
342 | * variable with the val parameter (second) to the callback. | |
343 | */ | |
bde68e60 | 344 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
806d9dd7 | 345 | { |
7eae43ae CC |
346 | if (!edev) |
347 | return -EINVAL; | |
348 | ||
bde68e60 | 349 | return extcon_update_state(edev, 0xffffffff, state); |
806d9dd7 | 350 | } |
de55d871 MH |
351 | EXPORT_SYMBOL_GPL(extcon_set_state); |
352 | ||
806d9dd7 | 353 | /** |
2a9de9c0 | 354 | * extcon_get_cable_state_() - Get the status of a specific cable. |
806d9dd7 | 355 | * @edev: the extcon device that has the cable. |
2a9de9c0 | 356 | * @id: the unique id of each external connector in extcon enumeration. |
806d9dd7 | 357 | */ |
73b6ecdb | 358 | int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id) |
806d9dd7 | 359 | { |
2a9de9c0 | 360 | int index; |
806d9dd7 | 361 | |
7eae43ae CC |
362 | if (!edev) |
363 | return -EINVAL; | |
364 | ||
2a9de9c0 CC |
365 | index = find_cable_index_by_id(edev, id); |
366 | if (index < 0) | |
367 | return index; | |
806d9dd7 | 368 | |
2a9de9c0 | 369 | if (edev->max_supported && edev->max_supported <= index) |
806d9dd7 MH |
370 | return -EINVAL; |
371 | ||
372 | return !!(edev->state & (1 << index)); | |
373 | } | |
374 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); | |
375 | ||
376 | /** | |
377 | * extcon_get_cable_state() - Get the status of a specific cable. | |
378 | * @edev: the extcon device that has the cable. | |
379 | * @cable_name: cable name. | |
380 | * | |
381 | * Note that this is slower than extcon_get_cable_state_. | |
382 | */ | |
383 | int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) | |
384 | { | |
a598af7f | 385 | int id; |
be052cc8 RQ |
386 | |
387 | id = find_cable_id_by_name(edev, cable_name); | |
388 | if (id < 0) | |
389 | return id; | |
390 | ||
391 | return extcon_get_cable_state_(edev, id); | |
806d9dd7 MH |
392 | } |
393 | EXPORT_SYMBOL_GPL(extcon_get_cable_state); | |
394 | ||
395 | /** | |
909f9ec0 | 396 | * extcon_set_cable_state_() - Set the status of a specific cable. |
a75e1c73 | 397 | * @edev: the extcon device that has the cable. |
2a9de9c0 CC |
398 | * @id: the unique id of each external connector |
399 | * in extcon enumeration. | |
400 | * @state: the new cable status. The default semantics is | |
806d9dd7 MH |
401 | * true: attached / false: detached. |
402 | */ | |
73b6ecdb | 403 | int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id, |
2a9de9c0 | 404 | bool cable_state) |
806d9dd7 MH |
405 | { |
406 | u32 state; | |
2a9de9c0 | 407 | int index; |
806d9dd7 | 408 | |
7eae43ae CC |
409 | if (!edev) |
410 | return -EINVAL; | |
411 | ||
2a9de9c0 CC |
412 | index = find_cable_index_by_id(edev, id); |
413 | if (index < 0) | |
414 | return index; | |
415 | ||
416 | if (edev->max_supported && edev->max_supported <= index) | |
806d9dd7 MH |
417 | return -EINVAL; |
418 | ||
419 | state = cable_state ? (1 << index) : 0; | |
bde68e60 | 420 | return extcon_update_state(edev, 1 << index, state); |
806d9dd7 MH |
421 | } |
422 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); | |
423 | ||
424 | /** | |
909f9ec0 | 425 | * extcon_set_cable_state() - Set the status of a specific cable. |
a75e1c73 CC |
426 | * @edev: the extcon device that has the cable. |
427 | * @cable_name: cable name. | |
806d9dd7 MH |
428 | * @cable_state: the new cable status. The default semantics is |
429 | * true: attached / false: detached. | |
430 | * | |
431 | * Note that this is slower than extcon_set_cable_state_. | |
432 | */ | |
433 | int extcon_set_cable_state(struct extcon_dev *edev, | |
434 | const char *cable_name, bool cable_state) | |
435 | { | |
a598af7f | 436 | int id; |
be052cc8 RQ |
437 | |
438 | id = find_cable_id_by_name(edev, cable_name); | |
439 | if (id < 0) | |
440 | return id; | |
441 | ||
442 | return extcon_set_cable_state_(edev, id, cable_state); | |
806d9dd7 MH |
443 | } |
444 | EXPORT_SYMBOL_GPL(extcon_set_cable_state); | |
445 | ||
74c5d09b DK |
446 | /** |
447 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
448 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
449 | */ | |
450 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
451 | { | |
452 | struct extcon_dev *sd; | |
453 | ||
7eae43ae CC |
454 | if (!extcon_name) |
455 | return ERR_PTR(-EINVAL); | |
456 | ||
74c5d09b DK |
457 | mutex_lock(&extcon_dev_list_lock); |
458 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
459 | if (!strcmp(sd->name, extcon_name)) | |
460 | goto out; | |
461 | } | |
462 | sd = NULL; | |
463 | out: | |
464 | mutex_unlock(&extcon_dev_list_lock); | |
465 | return sd; | |
466 | } | |
467 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
468 | ||
806d9dd7 MH |
469 | /** |
470 | * extcon_register_interest() - Register a notifier for a state change of a | |
a75e1c73 CC |
471 | * specific cable, not an entier set of cables of a |
472 | * extcon device. | |
473 | * @obj: an empty extcon_specific_cable_nb object to be returned. | |
806d9dd7 | 474 | * @extcon_name: the name of extcon device. |
4f2de3bf JT |
475 | * if NULL, extcon_register_interest will register |
476 | * every cable with the target cable_name given. | |
806d9dd7 | 477 | * @cable_name: the target cable name. |
a75e1c73 | 478 | * @nb: the notifier block to get notified. |
806d9dd7 MH |
479 | * |
480 | * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets | |
481 | * the struct for you. | |
482 | * | |
483 | * extcon_register_interest is a helper function for those who want to get | |
484 | * notification for a single specific cable's status change. If a user wants | |
485 | * to get notification for any changes of all cables of a extcon device, | |
486 | * he/she should use the general extcon_register_notifier(). | |
487 | * | |
488 | * Note that the second parameter given to the callback of nb (val) is | |
489 | * "old_state", not the current state. The current state can be retrieved | |
490 | * by looking at the third pameter (edev pointer)'s state value. | |
491 | */ | |
492 | int extcon_register_interest(struct extcon_specific_cable_nb *obj, | |
493 | const char *extcon_name, const char *cable_name, | |
494 | struct notifier_block *nb) | |
495 | { | |
66bee35f HG |
496 | unsigned long flags; |
497 | int ret; | |
498 | ||
4f2de3bf | 499 | if (!obj || !cable_name || !nb) |
806d9dd7 MH |
500 | return -EINVAL; |
501 | ||
4f2de3bf JT |
502 | if (extcon_name) { |
503 | obj->edev = extcon_get_extcon_dev(extcon_name); | |
504 | if (!obj->edev) | |
505 | return -ENODEV; | |
806d9dd7 | 506 | |
2a9de9c0 CC |
507 | obj->cable_index = find_cable_index_by_name(obj->edev, |
508 | cable_name); | |
4f2de3bf | 509 | if (obj->cable_index < 0) |
c0c078c3 | 510 | return obj->cable_index; |
806d9dd7 | 511 | |
4f2de3bf | 512 | obj->user_nb = nb; |
806d9dd7 | 513 | |
66bee35f | 514 | spin_lock_irqsave(&obj->edev->lock, flags); |
046050f6 CC |
515 | ret = raw_notifier_chain_register( |
516 | &obj->edev->nh[obj->cable_index], | |
517 | obj->user_nb); | |
66bee35f | 518 | spin_unlock_irqrestore(&obj->edev->lock, flags); |
4f2de3bf JT |
519 | } else { |
520 | struct class_dev_iter iter; | |
521 | struct extcon_dev *extd; | |
522 | struct device *dev; | |
523 | ||
524 | if (!extcon_class) | |
525 | return -ENODEV; | |
526 | class_dev_iter_init(&iter, extcon_class, NULL, NULL); | |
527 | while ((dev = class_dev_iter_next(&iter))) { | |
cb8bb3a7 | 528 | extd = dev_get_drvdata(dev); |
4f2de3bf | 529 | |
2a9de9c0 | 530 | if (find_cable_index_by_name(extd, cable_name) < 0) |
4f2de3bf JT |
531 | continue; |
532 | ||
533 | class_dev_iter_exit(&iter); | |
534 | return extcon_register_interest(obj, extd->name, | |
535 | cable_name, nb); | |
536 | } | |
537 | ||
b9ec23c0 | 538 | ret = -ENODEV; |
4f2de3bf | 539 | } |
b9ec23c0 CC |
540 | |
541 | return ret; | |
806d9dd7 | 542 | } |
9c8a013a | 543 | EXPORT_SYMBOL_GPL(extcon_register_interest); |
806d9dd7 MH |
544 | |
545 | /** | |
546 | * extcon_unregister_interest() - Unregister the notifier registered by | |
a75e1c73 | 547 | * extcon_register_interest(). |
806d9dd7 MH |
548 | * @obj: the extcon_specific_cable_nb object returned by |
549 | * extcon_register_interest(). | |
550 | */ | |
551 | int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) | |
552 | { | |
66bee35f HG |
553 | unsigned long flags; |
554 | int ret; | |
555 | ||
806d9dd7 MH |
556 | if (!obj) |
557 | return -EINVAL; | |
558 | ||
66bee35f | 559 | spin_lock_irqsave(&obj->edev->lock, flags); |
046050f6 CC |
560 | ret = raw_notifier_chain_unregister( |
561 | &obj->edev->nh[obj->cable_index], obj->user_nb); | |
66bee35f HG |
562 | spin_unlock_irqrestore(&obj->edev->lock, flags); |
563 | ||
564 | return ret; | |
806d9dd7 | 565 | } |
9c8a013a | 566 | EXPORT_SYMBOL_GPL(extcon_unregister_interest); |
806d9dd7 | 567 | |
74c5d09b | 568 | /** |
c338bb03 | 569 | * extcon_register_notifier() - Register a notifiee to get notified by |
a75e1c73 | 570 | * any attach status changes from the extcon. |
046050f6 CC |
571 | * @edev: the extcon device that has the external connecotr. |
572 | * @id: the unique id of each external connector in extcon enumeration. | |
74c5d09b | 573 | * @nb: a notifier block to be registered. |
806d9dd7 MH |
574 | * |
575 | * Note that the second parameter given to the callback of nb (val) is | |
576 | * "old_state", not the current state. The current state can be retrieved | |
577 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b | 578 | */ |
73b6ecdb | 579 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 580 | struct notifier_block *nb) |
74c5d09b | 581 | { |
66bee35f | 582 | unsigned long flags; |
046050f6 CC |
583 | int ret, idx; |
584 | ||
7eae43ae CC |
585 | if (!edev || !nb) |
586 | return -EINVAL; | |
587 | ||
046050f6 | 588 | idx = find_cable_index_by_id(edev, id); |
66bee35f HG |
589 | |
590 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 591 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); |
66bee35f HG |
592 | spin_unlock_irqrestore(&edev->lock, flags); |
593 | ||
594 | return ret; | |
74c5d09b DK |
595 | } |
596 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
597 | ||
598 | /** | |
c338bb03 | 599 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
046050f6 CC |
600 | * @edev: the extcon device that has the external connecotr. |
601 | * @id: the unique id of each external connector in extcon enumeration. | |
602 | * @nb: a notifier block to be registered. | |
74c5d09b | 603 | */ |
73b6ecdb | 604 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 605 | struct notifier_block *nb) |
74c5d09b | 606 | { |
66bee35f | 607 | unsigned long flags; |
046050f6 CC |
608 | int ret, idx; |
609 | ||
7eae43ae CC |
610 | if (!edev || !nb) |
611 | return -EINVAL; | |
612 | ||
046050f6 | 613 | idx = find_cable_index_by_id(edev, id); |
66bee35f HG |
614 | |
615 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 616 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
66bee35f HG |
617 | spin_unlock_irqrestore(&edev->lock, flags); |
618 | ||
619 | return ret; | |
74c5d09b DK |
620 | } |
621 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
622 | ||
af01da0e GKH |
623 | static struct attribute *extcon_attrs[] = { |
624 | &dev_attr_state.attr, | |
625 | &dev_attr_name.attr, | |
626 | NULL, | |
de55d871 | 627 | }; |
af01da0e | 628 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
629 | |
630 | static int create_extcon_class(void) | |
631 | { | |
632 | if (!extcon_class) { | |
633 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
634 | if (IS_ERR(extcon_class)) | |
635 | return PTR_ERR(extcon_class); | |
af01da0e | 636 | extcon_class->dev_groups = extcon_groups; |
de55d871 | 637 | |
449a2bf5 | 638 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
639 | switch_class = class_compat_register("switch"); |
640 | if (WARN(!switch_class, "cannot allocate")) | |
641 | return -ENOMEM; | |
449a2bf5 | 642 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
643 | } |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
de55d871 MH |
648 | static void extcon_dev_release(struct device *dev) |
649 | { | |
de55d871 MH |
650 | } |
651 | ||
bde68e60 | 652 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
653 | static void dummy_sysfs_dev_release(struct device *dev) |
654 | { | |
655 | } | |
656 | ||
a9af6522 CC |
657 | /* |
658 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
2a9de9c0 | 659 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
a9af6522 CC |
660 | * If supported_cable is NULL, cable name related APIs |
661 | * are disabled. | |
662 | * | |
663 | * This function allocates the memory for extcon device without allocating | |
664 | * memory in each extcon provider driver and initialize default setting for | |
665 | * extcon device. | |
666 | * | |
667 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail | |
668 | */ | |
73b6ecdb | 669 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
a9af6522 CC |
670 | { |
671 | struct extcon_dev *edev; | |
672 | ||
7eae43ae CC |
673 | if (!supported_cable) |
674 | return ERR_PTR(-EINVAL); | |
675 | ||
a9af6522 CC |
676 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
677 | if (!edev) | |
678 | return ERR_PTR(-ENOMEM); | |
679 | ||
680 | edev->max_supported = 0; | |
681 | edev->supported_cable = supported_cable; | |
682 | ||
683 | return edev; | |
684 | } | |
685 | ||
686 | /* | |
687 | * extcon_dev_free() - Free the memory of extcon device. | |
688 | * @edev: the extcon device to free | |
689 | */ | |
690 | void extcon_dev_free(struct extcon_dev *edev) | |
691 | { | |
692 | kfree(edev); | |
693 | } | |
694 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
695 | ||
739ba1bf CC |
696 | static int devm_extcon_dev_match(struct device *dev, void *res, void *data) |
697 | { | |
698 | struct extcon_dev **r = res; | |
699 | ||
700 | if (WARN_ON(!r || !*r)) | |
701 | return 0; | |
702 | ||
703 | return *r == data; | |
704 | } | |
705 | ||
706 | static void devm_extcon_dev_release(struct device *dev, void *res) | |
707 | { | |
708 | extcon_dev_free(*(struct extcon_dev **)res); | |
709 | } | |
710 | ||
711 | /** | |
712 | * devm_extcon_dev_allocate - Allocate managed extcon device | |
713 | * @dev: device owning the extcon device being created | |
2a9de9c0 | 714 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
739ba1bf CC |
715 | * If supported_cable is NULL, cable name related APIs |
716 | * are disabled. | |
717 | * | |
718 | * This function manages automatically the memory of extcon device using device | |
719 | * resource management and simplify the control of freeing the memory of extcon | |
720 | * device. | |
721 | * | |
722 | * Returns the pointer memory of allocated extcon_dev if success | |
723 | * or ERR_PTR(err) if fail | |
724 | */ | |
725 | struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, | |
73b6ecdb | 726 | const unsigned int *supported_cable) |
739ba1bf CC |
727 | { |
728 | struct extcon_dev **ptr, *edev; | |
729 | ||
730 | ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); | |
731 | if (!ptr) | |
732 | return ERR_PTR(-ENOMEM); | |
733 | ||
734 | edev = extcon_dev_allocate(supported_cable); | |
735 | if (IS_ERR(edev)) { | |
736 | devres_free(ptr); | |
737 | return edev; | |
738 | } | |
739 | ||
ac65a625 CC |
740 | edev->dev.parent = dev; |
741 | ||
739ba1bf CC |
742 | *ptr = edev; |
743 | devres_add(dev, ptr); | |
744 | ||
745 | return edev; | |
746 | } | |
747 | EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); | |
748 | ||
749 | void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) | |
750 | { | |
751 | WARN_ON(devres_release(dev, devm_extcon_dev_release, | |
752 | devm_extcon_dev_match, edev)); | |
753 | } | |
754 | EXPORT_SYMBOL_GPL(devm_extcon_dev_free); | |
755 | ||
de55d871 MH |
756 | /** |
757 | * extcon_dev_register() - Register a new extcon device | |
758 | * @edev : the new extcon device (should be allocated before calling) | |
de55d871 MH |
759 | * |
760 | * Among the members of edev struct, please set the "user initializing data" | |
761 | * in any case and set the "optional callbacks" if required. However, please | |
762 | * do not set the values of "internal data", which are initialized by | |
763 | * this function. | |
764 | */ | |
42d7d753 | 765 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 766 | { |
806d9dd7 | 767 | int ret, index = 0; |
71c3ffa5 | 768 | static atomic_t edev_no = ATOMIC_INIT(-1); |
de55d871 MH |
769 | |
770 | if (!extcon_class) { | |
771 | ret = create_extcon_class(); | |
772 | if (ret < 0) | |
773 | return ret; | |
774 | } | |
775 | ||
7eae43ae | 776 | if (!edev || !edev->supported_cable) |
2a9de9c0 CC |
777 | return -EINVAL; |
778 | ||
779 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); | |
806d9dd7 | 780 | |
2a9de9c0 | 781 | edev->max_supported = index; |
806d9dd7 | 782 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
783 | dev_err(&edev->dev, |
784 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
785 | return -EINVAL; |
786 | } | |
787 | ||
dae61651 CC |
788 | edev->dev.class = extcon_class; |
789 | edev->dev.release = extcon_dev_release; | |
de55d871 | 790 | |
71c3ffa5 | 791 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
792 | if (IS_ERR_OR_NULL(edev->name)) { |
793 | dev_err(&edev->dev, | |
794 | "extcon device name is null\n"); | |
795 | return -EINVAL; | |
796 | } | |
71c3ffa5 CC |
797 | dev_set_name(&edev->dev, "extcon%lu", |
798 | (unsigned long)atomic_inc_return(&edev_no)); | |
806d9dd7 MH |
799 | |
800 | if (edev->max_supported) { | |
801 | char buf[10]; | |
802 | char *str; | |
803 | struct extcon_cable *cable; | |
804 | ||
805 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
806 | edev->max_supported, GFP_KERNEL); | |
807 | if (!edev->cables) { | |
808 | ret = -ENOMEM; | |
809 | goto err_sysfs_alloc; | |
810 | } | |
811 | for (index = 0; index < edev->max_supported; index++) { | |
812 | cable = &edev->cables[index]; | |
813 | ||
814 | snprintf(buf, 10, "cable.%d", index); | |
815 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
816 | GFP_KERNEL); | |
817 | if (!str) { | |
818 | for (index--; index >= 0; index--) { | |
819 | cable = &edev->cables[index]; | |
820 | kfree(cable->attr_g.name); | |
821 | } | |
822 | ret = -ENOMEM; | |
823 | ||
824 | goto err_alloc_cables; | |
825 | } | |
826 | strcpy(str, buf); | |
827 | ||
828 | cable->edev = edev; | |
829 | cable->cable_index = index; | |
830 | cable->attrs[0] = &cable->attr_name.attr; | |
831 | cable->attrs[1] = &cable->attr_state.attr; | |
832 | cable->attrs[2] = NULL; | |
833 | cable->attr_g.name = str; | |
834 | cable->attr_g.attrs = cable->attrs; | |
835 | ||
9baf3220 | 836 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
837 | cable->attr_name.attr.name = "name"; |
838 | cable->attr_name.attr.mode = 0444; | |
839 | cable->attr_name.show = cable_name_show; | |
840 | ||
9baf3220 | 841 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 842 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 843 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 844 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
845 | } |
846 | } | |
847 | ||
bde68e60 MH |
848 | if (edev->max_supported && edev->mutually_exclusive) { |
849 | char buf[80]; | |
850 | char *name; | |
851 | ||
852 | /* Count the size of mutually_exclusive array */ | |
853 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
854 | ; | |
855 | ||
856 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
857 | (index + 1), GFP_KERNEL); | |
858 | if (!edev->attrs_muex) { | |
859 | ret = -ENOMEM; | |
860 | goto err_muex; | |
861 | } | |
862 | ||
863 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
864 | index, GFP_KERNEL); | |
865 | if (!edev->d_attrs_muex) { | |
866 | ret = -ENOMEM; | |
867 | kfree(edev->attrs_muex); | |
868 | goto err_muex; | |
869 | } | |
870 | ||
871 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
872 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
873 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
874 | GFP_KERNEL); | |
875 | if (!name) { | |
876 | for (index--; index >= 0; index--) { | |
877 | kfree(edev->d_attrs_muex[index].attr. | |
878 | name); | |
879 | } | |
880 | kfree(edev->d_attrs_muex); | |
881 | kfree(edev->attrs_muex); | |
882 | ret = -ENOMEM; | |
883 | goto err_muex; | |
884 | } | |
885 | strcpy(name, buf); | |
9baf3220 | 886 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
887 | edev->d_attrs_muex[index].attr.name = name; |
888 | edev->d_attrs_muex[index].attr.mode = 0000; | |
889 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
890 | .attr; | |
891 | } | |
892 | edev->attr_g_muex.name = muex_name; | |
893 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
894 | ||
895 | } | |
896 | ||
806d9dd7 MH |
897 | if (edev->max_supported) { |
898 | edev->extcon_dev_type.groups = | |
899 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 900 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
901 | if (!edev->extcon_dev_type.groups) { |
902 | ret = -ENOMEM; | |
903 | goto err_alloc_groups; | |
904 | } | |
905 | ||
dae61651 | 906 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
907 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
908 | ||
909 | for (index = 0; index < edev->max_supported; index++) | |
910 | edev->extcon_dev_type.groups[index] = | |
911 | &edev->cables[index].attr_g; | |
bde68e60 MH |
912 | if (edev->mutually_exclusive) |
913 | edev->extcon_dev_type.groups[index] = | |
914 | &edev->attr_g_muex; | |
806d9dd7 | 915 | |
dae61651 | 916 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
917 | } |
918 | ||
dae61651 | 919 | ret = device_register(&edev->dev); |
de55d871 | 920 | if (ret) { |
dae61651 | 921 | put_device(&edev->dev); |
de55d871 MH |
922 | goto err_dev; |
923 | } | |
449a2bf5 | 924 | #if defined(CONFIG_ANDROID) |
de55d871 | 925 | if (switch_class) |
dae61651 | 926 | ret = class_compat_create_link(switch_class, &edev->dev, NULL); |
449a2bf5 | 927 | #endif /* CONFIG_ANDROID */ |
de55d871 | 928 | |
806d9dd7 MH |
929 | spin_lock_init(&edev->lock); |
930 | ||
046050f6 CC |
931 | edev->nh = devm_kzalloc(&edev->dev, |
932 | sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL); | |
933 | if (!edev->nh) { | |
934 | ret = -ENOMEM; | |
935 | goto err_dev; | |
936 | } | |
937 | ||
938 | for (index = 0; index < edev->max_supported; index++) | |
939 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); | |
74c5d09b | 940 | |
dae61651 | 941 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 942 | edev->state = 0; |
74c5d09b DK |
943 | |
944 | mutex_lock(&extcon_dev_list_lock); | |
945 | list_add(&edev->entry, &extcon_dev_list); | |
946 | mutex_unlock(&extcon_dev_list_lock); | |
947 | ||
de55d871 MH |
948 | return 0; |
949 | ||
950 | err_dev: | |
806d9dd7 MH |
951 | if (edev->max_supported) |
952 | kfree(edev->extcon_dev_type.groups); | |
953 | err_alloc_groups: | |
bde68e60 MH |
954 | if (edev->max_supported && edev->mutually_exclusive) { |
955 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
956 | kfree(edev->d_attrs_muex[index].attr.name); | |
957 | kfree(edev->d_attrs_muex); | |
958 | kfree(edev->attrs_muex); | |
959 | } | |
960 | err_muex: | |
806d9dd7 MH |
961 | for (index = 0; index < edev->max_supported; index++) |
962 | kfree(edev->cables[index].attr_g.name); | |
963 | err_alloc_cables: | |
964 | if (edev->max_supported) | |
965 | kfree(edev->cables); | |
966 | err_sysfs_alloc: | |
de55d871 MH |
967 | return ret; |
968 | } | |
969 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
970 | ||
971 | /** | |
972 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 973 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
974 | * |
975 | * Note that this does not call kfree(edev) because edev was not allocated | |
976 | * by this class. | |
977 | */ | |
978 | void extcon_dev_unregister(struct extcon_dev *edev) | |
979 | { | |
57e7cd37 | 980 | int index; |
981 | ||
7eae43ae CC |
982 | if (!edev) |
983 | return; | |
984 | ||
57e7cd37 | 985 | mutex_lock(&extcon_dev_list_lock); |
986 | list_del(&edev->entry); | |
987 | mutex_unlock(&extcon_dev_list_lock); | |
988 | ||
dae61651 CC |
989 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
990 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
991 | dev_name(&edev->dev)); | |
57e7cd37 | 992 | return; |
993 | } | |
994 | ||
7585ca0d WX |
995 | device_unregister(&edev->dev); |
996 | ||
57e7cd37 | 997 | if (edev->mutually_exclusive && edev->max_supported) { |
998 | for (index = 0; edev->mutually_exclusive[index]; | |
999 | index++) | |
1000 | kfree(edev->d_attrs_muex[index].attr.name); | |
1001 | kfree(edev->d_attrs_muex); | |
1002 | kfree(edev->attrs_muex); | |
1003 | } | |
1004 | ||
1005 | for (index = 0; index < edev->max_supported; index++) | |
1006 | kfree(edev->cables[index].attr_g.name); | |
1007 | ||
1008 | if (edev->max_supported) { | |
1009 | kfree(edev->extcon_dev_type.groups); | |
1010 | kfree(edev->cables); | |
1011 | } | |
1012 | ||
1013 | #if defined(CONFIG_ANDROID) | |
1014 | if (switch_class) | |
dae61651 | 1015 | class_compat_remove_link(switch_class, &edev->dev, NULL); |
57e7cd37 | 1016 | #endif |
dae61651 | 1017 | put_device(&edev->dev); |
de55d871 MH |
1018 | } |
1019 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
1020 | ||
1111244f SW |
1021 | static void devm_extcon_dev_unreg(struct device *dev, void *res) |
1022 | { | |
1023 | extcon_dev_unregister(*(struct extcon_dev **)res); | |
1024 | } | |
1025 | ||
1111244f SW |
1026 | /** |
1027 | * devm_extcon_dev_register() - Resource-managed extcon_dev_register() | |
1028 | * @dev: device to allocate extcon device | |
1029 | * @edev: the new extcon device to register | |
1030 | * | |
1031 | * Managed extcon_dev_register() function. If extcon device is attached with | |
1032 | * this function, that extcon device is automatically unregistered on driver | |
1033 | * detach. Internally this function calls extcon_dev_register() function. | |
1034 | * To get more information, refer that function. | |
1035 | * | |
1036 | * If extcon device is registered with this function and the device needs to be | |
1037 | * unregistered separately, devm_extcon_dev_unregister() should be used. | |
1038 | * | |
1039 | * Returns 0 if success or negaive error number if failure. | |
1040 | */ | |
1041 | int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) | |
1042 | { | |
1043 | struct extcon_dev **ptr; | |
1044 | int ret; | |
1045 | ||
1046 | ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); | |
1047 | if (!ptr) | |
1048 | return -ENOMEM; | |
1049 | ||
1050 | ret = extcon_dev_register(edev); | |
1051 | if (ret) { | |
1052 | devres_free(ptr); | |
1053 | return ret; | |
1054 | } | |
1055 | ||
1056 | *ptr = edev; | |
1057 | devres_add(dev, ptr); | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | EXPORT_SYMBOL_GPL(devm_extcon_dev_register); | |
1062 | ||
1063 | /** | |
1064 | * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() | |
1065 | * @dev: device the extcon belongs to | |
1066 | * @edev: the extcon device to unregister | |
1067 | * | |
1068 | * Unregister extcon device that is registered with devm_extcon_dev_register() | |
1069 | * function. | |
1070 | */ | |
1071 | void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) | |
1072 | { | |
1073 | WARN_ON(devres_release(dev, devm_extcon_dev_unreg, | |
1074 | devm_extcon_dev_match, edev)); | |
1075 | } | |
1076 | EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); | |
1077 | ||
1ad94ffe CC |
1078 | #ifdef CONFIG_OF |
1079 | /* | |
1080 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree | |
1081 | * @dev - instance to the given device | |
1082 | * @index - index into list of extcon_dev | |
1083 | * | |
1084 | * return the instance of extcon device | |
1085 | */ | |
1086 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1087 | { | |
1088 | struct device_node *node; | |
1089 | struct extcon_dev *edev; | |
1090 | ||
7eae43ae CC |
1091 | if (!dev) |
1092 | return ERR_PTR(-EINVAL); | |
1093 | ||
1ad94ffe CC |
1094 | if (!dev->of_node) { |
1095 | dev_err(dev, "device does not have a device node entry\n"); | |
1096 | return ERR_PTR(-EINVAL); | |
1097 | } | |
1098 | ||
1099 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
1100 | if (!node) { | |
1101 | dev_err(dev, "failed to get phandle in %s node\n", | |
1102 | dev->of_node->full_name); | |
1103 | return ERR_PTR(-ENODEV); | |
1104 | } | |
1105 | ||
f841afb1 TF |
1106 | mutex_lock(&extcon_dev_list_lock); |
1107 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
1108 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
1109 | mutex_unlock(&extcon_dev_list_lock); | |
1110 | return edev; | |
1111 | } | |
1ad94ffe | 1112 | } |
f841afb1 | 1113 | mutex_unlock(&extcon_dev_list_lock); |
1ad94ffe | 1114 | |
f841afb1 | 1115 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
1116 | } |
1117 | #else | |
1118 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1119 | { | |
1120 | return ERR_PTR(-ENOSYS); | |
1121 | } | |
1122 | #endif /* CONFIG_OF */ | |
1123 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
1124 | ||
707d7550 CC |
1125 | /** |
1126 | * extcon_get_edev_name() - Get the name of the extcon device. | |
1127 | * @edev: the extcon device | |
1128 | */ | |
1129 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
1130 | { | |
1131 | return !edev ? NULL : edev->name; | |
1132 | } | |
1133 | ||
de55d871 MH |
1134 | static int __init extcon_class_init(void) |
1135 | { | |
1136 | return create_extcon_class(); | |
1137 | } | |
1138 | module_init(extcon_class_init); | |
1139 | ||
1140 | static void __exit extcon_class_exit(void) | |
1141 | { | |
0dc77b6d PH |
1142 | #if defined(CONFIG_ANDROID) |
1143 | class_compat_unregister(switch_class); | |
1144 | #endif | |
de55d871 MH |
1145 | class_destroy(extcon_class); |
1146 | } | |
1147 | module_exit(extcon_class_exit); | |
1148 | ||
2a9de9c0 | 1149 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 MH |
1150 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); |
1151 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
1152 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
1153 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
1154 | MODULE_LICENSE("GPL"); |