Commit | Line | Data |
---|---|---|
de55d871 MH |
1 | /* |
2 | * drivers/extcon/extcon_class.c | |
3 | * | |
4 | * External connector (extcon) class driver | |
5 | * | |
6 | * Copyright (C) 2012 Samsung Electronics | |
7 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
8 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
9 | * | |
10 | * based on android/drivers/switch/switch_class.c | |
11 | * Copyright (C) 2008 Google, Inc. | |
12 | * Author: Mike Lockwood <lockwood@android.com> | |
13 | * | |
14 | * This software is licensed under the terms of the GNU General Public | |
15 | * License version 2, as published by the Free Software Foundation, and | |
16 | * may be copied, distributed, and modified under those terms. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/device.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/extcon.h> | |
f841afb1 | 32 | #include <linux/of.h> |
de55d871 | 33 | #include <linux/slab.h> |
9baf3220 | 34 | #include <linux/sysfs.h> |
1ad94ffe | 35 | #include <linux/of.h> |
de55d871 | 36 | |
806d9dd7 MH |
37 | /* |
38 | * extcon_cable_name suggests the standard cable names for commonly used | |
39 | * cable types. | |
40 | * | |
41 | * However, please do not use extcon_cable_name directly for extcon_dev | |
42 | * struct's supported_cable pointer unless your device really supports | |
43 | * every single port-type of the following cable names. Please choose cable | |
44 | * names that are actually used in your extcon device. | |
45 | */ | |
0cf6ad8a | 46 | const char extcon_cable_name[][CABLE_NAME_MAX + 1] = { |
806d9dd7 MH |
47 | [EXTCON_USB] = "USB", |
48 | [EXTCON_USB_HOST] = "USB-Host", | |
49 | [EXTCON_TA] = "TA", | |
50 | [EXTCON_FAST_CHARGER] = "Fast-charger", | |
51 | [EXTCON_SLOW_CHARGER] = "Slow-charger", | |
52 | [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream", | |
53 | [EXTCON_HDMI] = "HDMI", | |
54 | [EXTCON_MHL] = "MHL", | |
55 | [EXTCON_DVI] = "DVI", | |
56 | [EXTCON_VGA] = "VGA", | |
57 | [EXTCON_DOCK] = "Dock", | |
58 | [EXTCON_LINE_IN] = "Line-in", | |
59 | [EXTCON_LINE_OUT] = "Line-out", | |
60 | [EXTCON_MIC_IN] = "Microphone", | |
61 | [EXTCON_HEADPHONE_OUT] = "Headphone", | |
62 | [EXTCON_SPDIF_IN] = "SPDIF-in", | |
63 | [EXTCON_SPDIF_OUT] = "SPDIF-out", | |
64 | [EXTCON_VIDEO_IN] = "Video-in", | |
65 | [EXTCON_VIDEO_OUT] = "Video-out", | |
0e1507c8 | 66 | [EXTCON_MECHANICAL] = "Mechanical", |
806d9dd7 MH |
67 | }; |
68 | ||
be3a07f7 | 69 | static struct class *extcon_class; |
449a2bf5 | 70 | #if defined(CONFIG_ANDROID) |
de55d871 | 71 | static struct class_compat *switch_class; |
449a2bf5 | 72 | #endif /* CONFIG_ANDROID */ |
de55d871 | 73 | |
74c5d09b DK |
74 | static LIST_HEAD(extcon_dev_list); |
75 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
76 | ||
bde68e60 MH |
77 | /** |
78 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
a75e1c73 | 79 | * condition. |
bde68e60 MH |
80 | * @edev: the extcon device |
81 | * @new_state: new cable attach status for @edev | |
82 | * | |
83 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
84 | * violated condition. | |
85 | */ | |
86 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
87 | { | |
88 | int i = 0; | |
89 | ||
90 | if (!edev->mutually_exclusive) | |
91 | return 0; | |
92 | ||
93 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 94 | int weight; |
bde68e60 | 95 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 96 | |
28c0ada6 | 97 | /* calculate the total number of bits set */ |
98 | weight = hweight32(correspondants); | |
99 | if (weight > 1) | |
100 | return i + 1; | |
bde68e60 MH |
101 | } |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
de55d871 MH |
106 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
107 | char *buf) | |
108 | { | |
806d9dd7 | 109 | int i, count = 0; |
cb8bb3a7 | 110 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 MH |
111 | |
112 | if (edev->print_state) { | |
113 | int ret = edev->print_state(edev, buf); | |
114 | ||
115 | if (ret >= 0) | |
116 | return ret; | |
117 | /* Use default if failed */ | |
118 | } | |
806d9dd7 MH |
119 | |
120 | if (edev->max_supported == 0) | |
121 | return sprintf(buf, "%u\n", edev->state); | |
122 | ||
123 | for (i = 0; i < SUPPORTED_CABLE_MAX; i++) { | |
124 | if (!edev->supported_cable[i]) | |
125 | break; | |
126 | count += sprintf(buf + count, "%s=%d\n", | |
127 | edev->supported_cable[i], | |
128 | !!(edev->state & (1 << i))); | |
129 | } | |
130 | ||
131 | return count; | |
132 | } | |
133 | ||
806d9dd7 MH |
134 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
135 | const char *buf, size_t count) | |
136 | { | |
137 | u32 state; | |
138 | ssize_t ret = 0; | |
cb8bb3a7 | 139 | struct extcon_dev *edev = dev_get_drvdata(dev); |
806d9dd7 MH |
140 | |
141 | ret = sscanf(buf, "0x%x", &state); | |
142 | if (ret == 0) | |
143 | ret = -EINVAL; | |
144 | else | |
bde68e60 | 145 | ret = extcon_set_state(edev, state); |
806d9dd7 MH |
146 | |
147 | if (ret < 0) | |
148 | return ret; | |
149 | ||
150 | return count; | |
de55d871 | 151 | } |
af01da0e | 152 | static DEVICE_ATTR_RW(state); |
de55d871 MH |
153 | |
154 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
155 | char *buf) | |
156 | { | |
cb8bb3a7 | 157 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 MH |
158 | |
159 | /* Optional callback given by the user */ | |
160 | if (edev->print_name) { | |
161 | int ret = edev->print_name(edev, buf); | |
162 | if (ret >= 0) | |
163 | return ret; | |
164 | } | |
165 | ||
dae61651 | 166 | return sprintf(buf, "%s\n", dev_name(&edev->dev)); |
de55d871 | 167 | } |
af01da0e | 168 | static DEVICE_ATTR_RO(name); |
de55d871 | 169 | |
806d9dd7 MH |
170 | static ssize_t cable_name_show(struct device *dev, |
171 | struct device_attribute *attr, char *buf) | |
172 | { | |
173 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
174 | attr_name); | |
175 | ||
176 | return sprintf(buf, "%s\n", | |
177 | cable->edev->supported_cable[cable->cable_index]); | |
178 | } | |
179 | ||
180 | static ssize_t cable_state_show(struct device *dev, | |
181 | struct device_attribute *attr, char *buf) | |
182 | { | |
183 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
184 | attr_state); | |
185 | ||
186 | return sprintf(buf, "%d\n", | |
187 | extcon_get_cable_state_(cable->edev, | |
188 | cable->cable_index)); | |
189 | } | |
190 | ||
de55d871 | 191 | /** |
806d9dd7 | 192 | * extcon_update_state() - Update the cable attach states of the extcon device |
a75e1c73 | 193 | * only for the masked bits. |
de55d871 | 194 | * @edev: the extcon device |
806d9dd7 | 195 | * @mask: the bit mask to designate updated bits. |
de55d871 MH |
196 | * @state: new cable attach status for @edev |
197 | * | |
198 | * Changing the state sends uevent with environment variable containing | |
199 | * the name of extcon device (envp[0]) and the state output (envp[1]). | |
200 | * Tizen uses this format for extcon device to get events from ports. | |
201 | * Android uses this format as well. | |
74c5d09b | 202 | * |
806d9dd7 MH |
203 | * Note that the notifier provides which bits are changed in the state |
204 | * variable with the val parameter (second) to the callback. | |
de55d871 | 205 | */ |
bde68e60 | 206 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
de55d871 MH |
207 | { |
208 | char name_buf[120]; | |
209 | char state_buf[120]; | |
210 | char *prop_buf; | |
211 | char *envp[3]; | |
212 | int env_offset = 0; | |
213 | int length; | |
806d9dd7 | 214 | unsigned long flags; |
de55d871 | 215 | |
806d9dd7 | 216 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 217 | |
806d9dd7 MH |
218 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
219 | u32 old_state = edev->state; | |
74c5d09b | 220 | |
bde68e60 MH |
221 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
222 | (state & mask))) { | |
223 | spin_unlock_irqrestore(&edev->lock, flags); | |
224 | return -EPERM; | |
225 | } | |
226 | ||
806d9dd7 MH |
227 | edev->state &= ~mask; |
228 | edev->state |= state & mask; | |
229 | ||
230 | raw_notifier_call_chain(&edev->nh, old_state, edev); | |
806d9dd7 MH |
231 | /* This could be in interrupt handler */ |
232 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
de55d871 | 233 | if (prop_buf) { |
dae61651 | 234 | length = name_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
235 | if (length > 0) { |
236 | if (prop_buf[length - 1] == '\n') | |
237 | prop_buf[length - 1] = 0; | |
238 | snprintf(name_buf, sizeof(name_buf), | |
239 | "NAME=%s", prop_buf); | |
240 | envp[env_offset++] = name_buf; | |
241 | } | |
dae61651 | 242 | length = state_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
243 | if (length > 0) { |
244 | if (prop_buf[length - 1] == '\n') | |
245 | prop_buf[length - 1] = 0; | |
246 | snprintf(state_buf, sizeof(state_buf), | |
247 | "STATE=%s", prop_buf); | |
248 | envp[env_offset++] = state_buf; | |
249 | } | |
250 | envp[env_offset] = NULL; | |
806d9dd7 MH |
251 | /* Unlock early before uevent */ |
252 | spin_unlock_irqrestore(&edev->lock, flags); | |
253 | ||
dae61651 | 254 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); |
de55d871 MH |
255 | free_page((unsigned long)prop_buf); |
256 | } else { | |
806d9dd7 MH |
257 | /* Unlock early before uevent */ |
258 | spin_unlock_irqrestore(&edev->lock, flags); | |
259 | ||
dae61651 CC |
260 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); |
261 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
de55d871 | 262 | } |
806d9dd7 MH |
263 | } else { |
264 | /* No changes */ | |
265 | spin_unlock_irqrestore(&edev->lock, flags); | |
de55d871 | 266 | } |
bde68e60 MH |
267 | |
268 | return 0; | |
de55d871 | 269 | } |
806d9dd7 MH |
270 | EXPORT_SYMBOL_GPL(extcon_update_state); |
271 | ||
272 | /** | |
273 | * extcon_set_state() - Set the cable attach states of the extcon device. | |
274 | * @edev: the extcon device | |
275 | * @state: new cable attach status for @edev | |
276 | * | |
277 | * Note that notifier provides which bits are changed in the state | |
278 | * variable with the val parameter (second) to the callback. | |
279 | */ | |
bde68e60 | 280 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
806d9dd7 | 281 | { |
bde68e60 | 282 | return extcon_update_state(edev, 0xffffffff, state); |
806d9dd7 | 283 | } |
de55d871 MH |
284 | EXPORT_SYMBOL_GPL(extcon_set_state); |
285 | ||
806d9dd7 MH |
286 | /** |
287 | * extcon_find_cable_index() - Get the cable index based on the cable name. | |
288 | * @edev: the extcon device that has the cable. | |
289 | * @cable_name: cable name to be searched. | |
290 | * | |
291 | * Note that accessing a cable state based on cable_index is faster than | |
292 | * cable_name because using cable_name induces a loop with strncmp(). | |
293 | * Thus, when get/set_cable_state is repeatedly used, using cable_index | |
294 | * is recommended. | |
295 | */ | |
296 | int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) | |
297 | { | |
298 | int i; | |
299 | ||
300 | if (edev->supported_cable) { | |
301 | for (i = 0; edev->supported_cable[i]; i++) { | |
302 | if (!strncmp(edev->supported_cable[i], | |
303 | cable_name, CABLE_NAME_MAX)) | |
304 | return i; | |
305 | } | |
306 | } | |
307 | ||
308 | return -EINVAL; | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(extcon_find_cable_index); | |
311 | ||
312 | /** | |
313 | * extcon_get_cable_state_() - Get the status of a specific cable. | |
314 | * @edev: the extcon device that has the cable. | |
315 | * @index: cable index that can be retrieved by extcon_find_cable_index(). | |
316 | */ | |
317 | int extcon_get_cable_state_(struct extcon_dev *edev, int index) | |
318 | { | |
319 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
320 | return -EINVAL; | |
321 | ||
322 | return !!(edev->state & (1 << index)); | |
323 | } | |
324 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); | |
325 | ||
326 | /** | |
327 | * extcon_get_cable_state() - Get the status of a specific cable. | |
328 | * @edev: the extcon device that has the cable. | |
329 | * @cable_name: cable name. | |
330 | * | |
331 | * Note that this is slower than extcon_get_cable_state_. | |
332 | */ | |
333 | int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) | |
334 | { | |
335 | return extcon_get_cable_state_(edev, extcon_find_cable_index | |
336 | (edev, cable_name)); | |
337 | } | |
338 | EXPORT_SYMBOL_GPL(extcon_get_cable_state); | |
339 | ||
340 | /** | |
909f9ec0 | 341 | * extcon_set_cable_state_() - Set the status of a specific cable. |
a75e1c73 CC |
342 | * @edev: the extcon device that has the cable. |
343 | * @index: cable index that can be retrieved by | |
344 | * extcon_find_cable_index(). | |
806d9dd7 MH |
345 | * @cable_state: the new cable status. The default semantics is |
346 | * true: attached / false: detached. | |
347 | */ | |
348 | int extcon_set_cable_state_(struct extcon_dev *edev, | |
349 | int index, bool cable_state) | |
350 | { | |
351 | u32 state; | |
352 | ||
353 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
354 | return -EINVAL; | |
355 | ||
356 | state = cable_state ? (1 << index) : 0; | |
bde68e60 | 357 | return extcon_update_state(edev, 1 << index, state); |
806d9dd7 MH |
358 | } |
359 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); | |
360 | ||
361 | /** | |
909f9ec0 | 362 | * extcon_set_cable_state() - Set the status of a specific cable. |
a75e1c73 CC |
363 | * @edev: the extcon device that has the cable. |
364 | * @cable_name: cable name. | |
806d9dd7 MH |
365 | * @cable_state: the new cable status. The default semantics is |
366 | * true: attached / false: detached. | |
367 | * | |
368 | * Note that this is slower than extcon_set_cable_state_. | |
369 | */ | |
370 | int extcon_set_cable_state(struct extcon_dev *edev, | |
371 | const char *cable_name, bool cable_state) | |
372 | { | |
373 | return extcon_set_cable_state_(edev, extcon_find_cable_index | |
374 | (edev, cable_name), cable_state); | |
375 | } | |
376 | EXPORT_SYMBOL_GPL(extcon_set_cable_state); | |
377 | ||
74c5d09b DK |
378 | /** |
379 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
380 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
381 | */ | |
382 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
383 | { | |
384 | struct extcon_dev *sd; | |
385 | ||
386 | mutex_lock(&extcon_dev_list_lock); | |
387 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
388 | if (!strcmp(sd->name, extcon_name)) | |
389 | goto out; | |
390 | } | |
391 | sd = NULL; | |
392 | out: | |
393 | mutex_unlock(&extcon_dev_list_lock); | |
394 | return sd; | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
397 | ||
806d9dd7 MH |
398 | static int _call_per_cable(struct notifier_block *nb, unsigned long val, |
399 | void *ptr) | |
400 | { | |
401 | struct extcon_specific_cable_nb *obj = container_of(nb, | |
402 | struct extcon_specific_cable_nb, internal_nb); | |
403 | struct extcon_dev *edev = ptr; | |
404 | ||
405 | if ((val & (1 << obj->cable_index)) != | |
406 | (edev->state & (1 << obj->cable_index))) { | |
f4cce696 CC |
407 | bool cable_state = true; |
408 | ||
806d9dd7 | 409 | obj->previous_value = val; |
f4cce696 CC |
410 | |
411 | if (val & (1 << obj->cable_index)) | |
412 | cable_state = false; | |
413 | ||
414 | return obj->user_nb->notifier_call(obj->user_nb, | |
415 | cable_state, ptr); | |
806d9dd7 MH |
416 | } |
417 | ||
418 | return NOTIFY_OK; | |
419 | } | |
420 | ||
421 | /** | |
422 | * extcon_register_interest() - Register a notifier for a state change of a | |
a75e1c73 CC |
423 | * specific cable, not an entier set of cables of a |
424 | * extcon device. | |
425 | * @obj: an empty extcon_specific_cable_nb object to be returned. | |
806d9dd7 | 426 | * @extcon_name: the name of extcon device. |
4f2de3bf JT |
427 | * if NULL, extcon_register_interest will register |
428 | * every cable with the target cable_name given. | |
806d9dd7 | 429 | * @cable_name: the target cable name. |
a75e1c73 | 430 | * @nb: the notifier block to get notified. |
806d9dd7 MH |
431 | * |
432 | * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets | |
433 | * the struct for you. | |
434 | * | |
435 | * extcon_register_interest is a helper function for those who want to get | |
436 | * notification for a single specific cable's status change. If a user wants | |
437 | * to get notification for any changes of all cables of a extcon device, | |
438 | * he/she should use the general extcon_register_notifier(). | |
439 | * | |
440 | * Note that the second parameter given to the callback of nb (val) is | |
441 | * "old_state", not the current state. The current state can be retrieved | |
442 | * by looking at the third pameter (edev pointer)'s state value. | |
443 | */ | |
444 | int extcon_register_interest(struct extcon_specific_cable_nb *obj, | |
445 | const char *extcon_name, const char *cable_name, | |
446 | struct notifier_block *nb) | |
447 | { | |
4f2de3bf | 448 | if (!obj || !cable_name || !nb) |
806d9dd7 MH |
449 | return -EINVAL; |
450 | ||
4f2de3bf JT |
451 | if (extcon_name) { |
452 | obj->edev = extcon_get_extcon_dev(extcon_name); | |
453 | if (!obj->edev) | |
454 | return -ENODEV; | |
806d9dd7 | 455 | |
c2275d2f CC |
456 | obj->cable_index = extcon_find_cable_index(obj->edev, |
457 | cable_name); | |
4f2de3bf | 458 | if (obj->cable_index < 0) |
c0c078c3 | 459 | return obj->cable_index; |
806d9dd7 | 460 | |
4f2de3bf | 461 | obj->user_nb = nb; |
806d9dd7 | 462 | |
4f2de3bf | 463 | obj->internal_nb.notifier_call = _call_per_cable; |
806d9dd7 | 464 | |
c2275d2f CC |
465 | return raw_notifier_chain_register(&obj->edev->nh, |
466 | &obj->internal_nb); | |
4f2de3bf JT |
467 | } else { |
468 | struct class_dev_iter iter; | |
469 | struct extcon_dev *extd; | |
470 | struct device *dev; | |
471 | ||
472 | if (!extcon_class) | |
473 | return -ENODEV; | |
474 | class_dev_iter_init(&iter, extcon_class, NULL, NULL); | |
475 | while ((dev = class_dev_iter_next(&iter))) { | |
cb8bb3a7 | 476 | extd = dev_get_drvdata(dev); |
4f2de3bf JT |
477 | |
478 | if (extcon_find_cable_index(extd, cable_name) < 0) | |
479 | continue; | |
480 | ||
481 | class_dev_iter_exit(&iter); | |
482 | return extcon_register_interest(obj, extd->name, | |
483 | cable_name, nb); | |
484 | } | |
485 | ||
486 | return -ENODEV; | |
487 | } | |
806d9dd7 | 488 | } |
9c8a013a | 489 | EXPORT_SYMBOL_GPL(extcon_register_interest); |
806d9dd7 MH |
490 | |
491 | /** | |
492 | * extcon_unregister_interest() - Unregister the notifier registered by | |
a75e1c73 | 493 | * extcon_register_interest(). |
806d9dd7 MH |
494 | * @obj: the extcon_specific_cable_nb object returned by |
495 | * extcon_register_interest(). | |
496 | */ | |
497 | int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) | |
498 | { | |
499 | if (!obj) | |
500 | return -EINVAL; | |
501 | ||
502 | return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); | |
503 | } | |
9c8a013a | 504 | EXPORT_SYMBOL_GPL(extcon_unregister_interest); |
806d9dd7 | 505 | |
74c5d09b | 506 | /** |
c338bb03 | 507 | * extcon_register_notifier() - Register a notifiee to get notified by |
a75e1c73 | 508 | * any attach status changes from the extcon. |
74c5d09b DK |
509 | * @edev: the extcon device. |
510 | * @nb: a notifier block to be registered. | |
806d9dd7 MH |
511 | * |
512 | * Note that the second parameter given to the callback of nb (val) is | |
513 | * "old_state", not the current state. The current state can be retrieved | |
514 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b DK |
515 | */ |
516 | int extcon_register_notifier(struct extcon_dev *edev, | |
517 | struct notifier_block *nb) | |
518 | { | |
519 | return raw_notifier_chain_register(&edev->nh, nb); | |
520 | } | |
521 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
522 | ||
523 | /** | |
c338bb03 | 524 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
74c5d09b DK |
525 | * @edev: the extcon device. |
526 | * @nb: a registered notifier block to be unregistered. | |
527 | */ | |
528 | int extcon_unregister_notifier(struct extcon_dev *edev, | |
529 | struct notifier_block *nb) | |
530 | { | |
531 | return raw_notifier_chain_unregister(&edev->nh, nb); | |
532 | } | |
533 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
534 | ||
af01da0e GKH |
535 | static struct attribute *extcon_attrs[] = { |
536 | &dev_attr_state.attr, | |
537 | &dev_attr_name.attr, | |
538 | NULL, | |
de55d871 | 539 | }; |
af01da0e | 540 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
541 | |
542 | static int create_extcon_class(void) | |
543 | { | |
544 | if (!extcon_class) { | |
545 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
546 | if (IS_ERR(extcon_class)) | |
547 | return PTR_ERR(extcon_class); | |
af01da0e | 548 | extcon_class->dev_groups = extcon_groups; |
de55d871 | 549 | |
449a2bf5 | 550 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
551 | switch_class = class_compat_register("switch"); |
552 | if (WARN(!switch_class, "cannot allocate")) | |
553 | return -ENOMEM; | |
449a2bf5 | 554 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
555 | } |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
de55d871 MH |
560 | static void extcon_dev_release(struct device *dev) |
561 | { | |
de55d871 MH |
562 | } |
563 | ||
bde68e60 | 564 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
565 | static void dummy_sysfs_dev_release(struct device *dev) |
566 | { | |
567 | } | |
568 | ||
a9af6522 CC |
569 | /* |
570 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
571 | * @supported_cable: Array of supported cable names ending with NULL. | |
572 | * If supported_cable is NULL, cable name related APIs | |
573 | * are disabled. | |
574 | * | |
575 | * This function allocates the memory for extcon device without allocating | |
576 | * memory in each extcon provider driver and initialize default setting for | |
577 | * extcon device. | |
578 | * | |
579 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail | |
580 | */ | |
581 | struct extcon_dev *extcon_dev_allocate(const char **supported_cable) | |
582 | { | |
583 | struct extcon_dev *edev; | |
584 | ||
585 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); | |
586 | if (!edev) | |
587 | return ERR_PTR(-ENOMEM); | |
588 | ||
589 | edev->max_supported = 0; | |
590 | edev->supported_cable = supported_cable; | |
591 | ||
592 | return edev; | |
593 | } | |
594 | ||
595 | /* | |
596 | * extcon_dev_free() - Free the memory of extcon device. | |
597 | * @edev: the extcon device to free | |
598 | */ | |
599 | void extcon_dev_free(struct extcon_dev *edev) | |
600 | { | |
601 | kfree(edev); | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
604 | ||
739ba1bf CC |
605 | static int devm_extcon_dev_match(struct device *dev, void *res, void *data) |
606 | { | |
607 | struct extcon_dev **r = res; | |
608 | ||
609 | if (WARN_ON(!r || !*r)) | |
610 | return 0; | |
611 | ||
612 | return *r == data; | |
613 | } | |
614 | ||
615 | static void devm_extcon_dev_release(struct device *dev, void *res) | |
616 | { | |
617 | extcon_dev_free(*(struct extcon_dev **)res); | |
618 | } | |
619 | ||
620 | /** | |
621 | * devm_extcon_dev_allocate - Allocate managed extcon device | |
622 | * @dev: device owning the extcon device being created | |
623 | * @supported_cable: Array of supported cable names ending with NULL. | |
624 | * If supported_cable is NULL, cable name related APIs | |
625 | * are disabled. | |
626 | * | |
627 | * This function manages automatically the memory of extcon device using device | |
628 | * resource management and simplify the control of freeing the memory of extcon | |
629 | * device. | |
630 | * | |
631 | * Returns the pointer memory of allocated extcon_dev if success | |
632 | * or ERR_PTR(err) if fail | |
633 | */ | |
634 | struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, | |
635 | const char **supported_cable) | |
636 | { | |
637 | struct extcon_dev **ptr, *edev; | |
638 | ||
639 | ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); | |
640 | if (!ptr) | |
641 | return ERR_PTR(-ENOMEM); | |
642 | ||
643 | edev = extcon_dev_allocate(supported_cable); | |
644 | if (IS_ERR(edev)) { | |
645 | devres_free(ptr); | |
646 | return edev; | |
647 | } | |
648 | ||
ac65a625 CC |
649 | edev->dev.parent = dev; |
650 | ||
739ba1bf CC |
651 | *ptr = edev; |
652 | devres_add(dev, ptr); | |
653 | ||
654 | return edev; | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); | |
657 | ||
658 | void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) | |
659 | { | |
660 | WARN_ON(devres_release(dev, devm_extcon_dev_release, | |
661 | devm_extcon_dev_match, edev)); | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(devm_extcon_dev_free); | |
664 | ||
de55d871 MH |
665 | /** |
666 | * extcon_dev_register() - Register a new extcon device | |
667 | * @edev : the new extcon device (should be allocated before calling) | |
de55d871 MH |
668 | * |
669 | * Among the members of edev struct, please set the "user initializing data" | |
670 | * in any case and set the "optional callbacks" if required. However, please | |
671 | * do not set the values of "internal data", which are initialized by | |
672 | * this function. | |
673 | */ | |
42d7d753 | 674 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 675 | { |
806d9dd7 | 676 | int ret, index = 0; |
de55d871 MH |
677 | |
678 | if (!extcon_class) { | |
679 | ret = create_extcon_class(); | |
680 | if (ret < 0) | |
681 | return ret; | |
682 | } | |
683 | ||
806d9dd7 MH |
684 | if (edev->supported_cable) { |
685 | /* Get size of array */ | |
686 | for (index = 0; edev->supported_cable[index]; index++) | |
687 | ; | |
688 | edev->max_supported = index; | |
689 | } else { | |
690 | edev->max_supported = 0; | |
691 | } | |
692 | ||
693 | if (index > SUPPORTED_CABLE_MAX) { | |
dae61651 | 694 | dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\n"); |
806d9dd7 MH |
695 | return -EINVAL; |
696 | } | |
697 | ||
dae61651 CC |
698 | edev->dev.class = extcon_class; |
699 | edev->dev.release = extcon_dev_release; | |
de55d871 | 700 | |
42d7d753 CC |
701 | edev->name = edev->name ? edev->name : dev_name(edev->dev.parent); |
702 | if (IS_ERR_OR_NULL(edev->name)) { | |
703 | dev_err(&edev->dev, | |
704 | "extcon device name is null\n"); | |
705 | return -EINVAL; | |
706 | } | |
dae61651 | 707 | dev_set_name(&edev->dev, "%s", edev->name); |
806d9dd7 MH |
708 | |
709 | if (edev->max_supported) { | |
710 | char buf[10]; | |
711 | char *str; | |
712 | struct extcon_cable *cable; | |
713 | ||
714 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
715 | edev->max_supported, GFP_KERNEL); | |
716 | if (!edev->cables) { | |
717 | ret = -ENOMEM; | |
718 | goto err_sysfs_alloc; | |
719 | } | |
720 | for (index = 0; index < edev->max_supported; index++) { | |
721 | cable = &edev->cables[index]; | |
722 | ||
723 | snprintf(buf, 10, "cable.%d", index); | |
724 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
725 | GFP_KERNEL); | |
726 | if (!str) { | |
727 | for (index--; index >= 0; index--) { | |
728 | cable = &edev->cables[index]; | |
729 | kfree(cable->attr_g.name); | |
730 | } | |
731 | ret = -ENOMEM; | |
732 | ||
733 | goto err_alloc_cables; | |
734 | } | |
735 | strcpy(str, buf); | |
736 | ||
737 | cable->edev = edev; | |
738 | cable->cable_index = index; | |
739 | cable->attrs[0] = &cable->attr_name.attr; | |
740 | cable->attrs[1] = &cable->attr_state.attr; | |
741 | cable->attrs[2] = NULL; | |
742 | cable->attr_g.name = str; | |
743 | cable->attr_g.attrs = cable->attrs; | |
744 | ||
9baf3220 | 745 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
746 | cable->attr_name.attr.name = "name"; |
747 | cable->attr_name.attr.mode = 0444; | |
748 | cable->attr_name.show = cable_name_show; | |
749 | ||
9baf3220 | 750 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 751 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 752 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 753 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
754 | } |
755 | } | |
756 | ||
bde68e60 MH |
757 | if (edev->max_supported && edev->mutually_exclusive) { |
758 | char buf[80]; | |
759 | char *name; | |
760 | ||
761 | /* Count the size of mutually_exclusive array */ | |
762 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
763 | ; | |
764 | ||
765 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
766 | (index + 1), GFP_KERNEL); | |
767 | if (!edev->attrs_muex) { | |
768 | ret = -ENOMEM; | |
769 | goto err_muex; | |
770 | } | |
771 | ||
772 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
773 | index, GFP_KERNEL); | |
774 | if (!edev->d_attrs_muex) { | |
775 | ret = -ENOMEM; | |
776 | kfree(edev->attrs_muex); | |
777 | goto err_muex; | |
778 | } | |
779 | ||
780 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
781 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
782 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
783 | GFP_KERNEL); | |
784 | if (!name) { | |
785 | for (index--; index >= 0; index--) { | |
786 | kfree(edev->d_attrs_muex[index].attr. | |
787 | name); | |
788 | } | |
789 | kfree(edev->d_attrs_muex); | |
790 | kfree(edev->attrs_muex); | |
791 | ret = -ENOMEM; | |
792 | goto err_muex; | |
793 | } | |
794 | strcpy(name, buf); | |
9baf3220 | 795 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
796 | edev->d_attrs_muex[index].attr.name = name; |
797 | edev->d_attrs_muex[index].attr.mode = 0000; | |
798 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
799 | .attr; | |
800 | } | |
801 | edev->attr_g_muex.name = muex_name; | |
802 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
803 | ||
804 | } | |
805 | ||
806d9dd7 MH |
806 | if (edev->max_supported) { |
807 | edev->extcon_dev_type.groups = | |
808 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 809 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
810 | if (!edev->extcon_dev_type.groups) { |
811 | ret = -ENOMEM; | |
812 | goto err_alloc_groups; | |
813 | } | |
814 | ||
dae61651 | 815 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
816 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
817 | ||
818 | for (index = 0; index < edev->max_supported; index++) | |
819 | edev->extcon_dev_type.groups[index] = | |
820 | &edev->cables[index].attr_g; | |
bde68e60 MH |
821 | if (edev->mutually_exclusive) |
822 | edev->extcon_dev_type.groups[index] = | |
823 | &edev->attr_g_muex; | |
806d9dd7 | 824 | |
dae61651 | 825 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
826 | } |
827 | ||
dae61651 | 828 | ret = device_register(&edev->dev); |
de55d871 | 829 | if (ret) { |
dae61651 | 830 | put_device(&edev->dev); |
de55d871 MH |
831 | goto err_dev; |
832 | } | |
449a2bf5 | 833 | #if defined(CONFIG_ANDROID) |
de55d871 | 834 | if (switch_class) |
dae61651 | 835 | ret = class_compat_create_link(switch_class, &edev->dev, NULL); |
449a2bf5 | 836 | #endif /* CONFIG_ANDROID */ |
de55d871 | 837 | |
806d9dd7 MH |
838 | spin_lock_init(&edev->lock); |
839 | ||
74c5d09b DK |
840 | RAW_INIT_NOTIFIER_HEAD(&edev->nh); |
841 | ||
dae61651 | 842 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 843 | edev->state = 0; |
74c5d09b DK |
844 | |
845 | mutex_lock(&extcon_dev_list_lock); | |
846 | list_add(&edev->entry, &extcon_dev_list); | |
847 | mutex_unlock(&extcon_dev_list_lock); | |
848 | ||
de55d871 MH |
849 | return 0; |
850 | ||
851 | err_dev: | |
806d9dd7 MH |
852 | if (edev->max_supported) |
853 | kfree(edev->extcon_dev_type.groups); | |
854 | err_alloc_groups: | |
bde68e60 MH |
855 | if (edev->max_supported && edev->mutually_exclusive) { |
856 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
857 | kfree(edev->d_attrs_muex[index].attr.name); | |
858 | kfree(edev->d_attrs_muex); | |
859 | kfree(edev->attrs_muex); | |
860 | } | |
861 | err_muex: | |
806d9dd7 MH |
862 | for (index = 0; index < edev->max_supported; index++) |
863 | kfree(edev->cables[index].attr_g.name); | |
864 | err_alloc_cables: | |
865 | if (edev->max_supported) | |
866 | kfree(edev->cables); | |
867 | err_sysfs_alloc: | |
de55d871 MH |
868 | return ret; |
869 | } | |
870 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
871 | ||
872 | /** | |
873 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 874 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
875 | * |
876 | * Note that this does not call kfree(edev) because edev was not allocated | |
877 | * by this class. | |
878 | */ | |
879 | void extcon_dev_unregister(struct extcon_dev *edev) | |
880 | { | |
57e7cd37 | 881 | int index; |
882 | ||
883 | mutex_lock(&extcon_dev_list_lock); | |
884 | list_del(&edev->entry); | |
885 | mutex_unlock(&extcon_dev_list_lock); | |
886 | ||
dae61651 CC |
887 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
888 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
889 | dev_name(&edev->dev)); | |
57e7cd37 | 890 | return; |
891 | } | |
892 | ||
7585ca0d WX |
893 | device_unregister(&edev->dev); |
894 | ||
57e7cd37 | 895 | if (edev->mutually_exclusive && edev->max_supported) { |
896 | for (index = 0; edev->mutually_exclusive[index]; | |
897 | index++) | |
898 | kfree(edev->d_attrs_muex[index].attr.name); | |
899 | kfree(edev->d_attrs_muex); | |
900 | kfree(edev->attrs_muex); | |
901 | } | |
902 | ||
903 | for (index = 0; index < edev->max_supported; index++) | |
904 | kfree(edev->cables[index].attr_g.name); | |
905 | ||
906 | if (edev->max_supported) { | |
907 | kfree(edev->extcon_dev_type.groups); | |
908 | kfree(edev->cables); | |
909 | } | |
910 | ||
911 | #if defined(CONFIG_ANDROID) | |
912 | if (switch_class) | |
dae61651 | 913 | class_compat_remove_link(switch_class, &edev->dev, NULL); |
57e7cd37 | 914 | #endif |
dae61651 | 915 | put_device(&edev->dev); |
de55d871 MH |
916 | } |
917 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
918 | ||
1111244f SW |
919 | static void devm_extcon_dev_unreg(struct device *dev, void *res) |
920 | { | |
921 | extcon_dev_unregister(*(struct extcon_dev **)res); | |
922 | } | |
923 | ||
1111244f SW |
924 | /** |
925 | * devm_extcon_dev_register() - Resource-managed extcon_dev_register() | |
926 | * @dev: device to allocate extcon device | |
927 | * @edev: the new extcon device to register | |
928 | * | |
929 | * Managed extcon_dev_register() function. If extcon device is attached with | |
930 | * this function, that extcon device is automatically unregistered on driver | |
931 | * detach. Internally this function calls extcon_dev_register() function. | |
932 | * To get more information, refer that function. | |
933 | * | |
934 | * If extcon device is registered with this function and the device needs to be | |
935 | * unregistered separately, devm_extcon_dev_unregister() should be used. | |
936 | * | |
937 | * Returns 0 if success or negaive error number if failure. | |
938 | */ | |
939 | int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) | |
940 | { | |
941 | struct extcon_dev **ptr; | |
942 | int ret; | |
943 | ||
944 | ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); | |
945 | if (!ptr) | |
946 | return -ENOMEM; | |
947 | ||
948 | ret = extcon_dev_register(edev); | |
949 | if (ret) { | |
950 | devres_free(ptr); | |
951 | return ret; | |
952 | } | |
953 | ||
954 | *ptr = edev; | |
955 | devres_add(dev, ptr); | |
956 | ||
957 | return 0; | |
958 | } | |
959 | EXPORT_SYMBOL_GPL(devm_extcon_dev_register); | |
960 | ||
961 | /** | |
962 | * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() | |
963 | * @dev: device the extcon belongs to | |
964 | * @edev: the extcon device to unregister | |
965 | * | |
966 | * Unregister extcon device that is registered with devm_extcon_dev_register() | |
967 | * function. | |
968 | */ | |
969 | void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) | |
970 | { | |
971 | WARN_ON(devres_release(dev, devm_extcon_dev_unreg, | |
972 | devm_extcon_dev_match, edev)); | |
973 | } | |
974 | EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); | |
975 | ||
1ad94ffe CC |
976 | #ifdef CONFIG_OF |
977 | /* | |
978 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree | |
979 | * @dev - instance to the given device | |
980 | * @index - index into list of extcon_dev | |
981 | * | |
982 | * return the instance of extcon device | |
983 | */ | |
984 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
985 | { | |
986 | struct device_node *node; | |
987 | struct extcon_dev *edev; | |
988 | ||
989 | if (!dev->of_node) { | |
990 | dev_err(dev, "device does not have a device node entry\n"); | |
991 | return ERR_PTR(-EINVAL); | |
992 | } | |
993 | ||
994 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
995 | if (!node) { | |
996 | dev_err(dev, "failed to get phandle in %s node\n", | |
997 | dev->of_node->full_name); | |
998 | return ERR_PTR(-ENODEV); | |
999 | } | |
1000 | ||
f841afb1 TF |
1001 | mutex_lock(&extcon_dev_list_lock); |
1002 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
1003 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
1004 | mutex_unlock(&extcon_dev_list_lock); | |
1005 | return edev; | |
1006 | } | |
1ad94ffe | 1007 | } |
f841afb1 | 1008 | mutex_unlock(&extcon_dev_list_lock); |
1ad94ffe | 1009 | |
f841afb1 | 1010 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
1011 | } |
1012 | #else | |
1013 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1014 | { | |
1015 | return ERR_PTR(-ENOSYS); | |
1016 | } | |
1017 | #endif /* CONFIG_OF */ | |
1018 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
1019 | ||
de55d871 MH |
1020 | static int __init extcon_class_init(void) |
1021 | { | |
1022 | return create_extcon_class(); | |
1023 | } | |
1024 | module_init(extcon_class_init); | |
1025 | ||
1026 | static void __exit extcon_class_exit(void) | |
1027 | { | |
0dc77b6d PH |
1028 | #if defined(CONFIG_ANDROID) |
1029 | class_compat_unregister(switch_class); | |
1030 | #endif | |
de55d871 MH |
1031 | class_destroy(extcon_class); |
1032 | } | |
1033 | module_exit(extcon_class_exit); | |
1034 | ||
1035 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); | |
1036 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
1037 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
1038 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
1039 | MODULE_LICENSE("GPL"); |