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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> | |
32 | #include <linux/slab.h> | |
9baf3220 | 33 | #include <linux/sysfs.h> |
de55d871 | 34 | |
806d9dd7 MH |
35 | /* |
36 | * extcon_cable_name suggests the standard cable names for commonly used | |
37 | * cable types. | |
38 | * | |
39 | * However, please do not use extcon_cable_name directly for extcon_dev | |
40 | * struct's supported_cable pointer unless your device really supports | |
41 | * every single port-type of the following cable names. Please choose cable | |
42 | * names that are actually used in your extcon device. | |
43 | */ | |
44 | const char *extcon_cable_name[] = { | |
45 | [EXTCON_USB] = "USB", | |
46 | [EXTCON_USB_HOST] = "USB-Host", | |
47 | [EXTCON_TA] = "TA", | |
48 | [EXTCON_FAST_CHARGER] = "Fast-charger", | |
49 | [EXTCON_SLOW_CHARGER] = "Slow-charger", | |
50 | [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream", | |
51 | [EXTCON_HDMI] = "HDMI", | |
52 | [EXTCON_MHL] = "MHL", | |
53 | [EXTCON_DVI] = "DVI", | |
54 | [EXTCON_VGA] = "VGA", | |
55 | [EXTCON_DOCK] = "Dock", | |
56 | [EXTCON_LINE_IN] = "Line-in", | |
57 | [EXTCON_LINE_OUT] = "Line-out", | |
58 | [EXTCON_MIC_IN] = "Microphone", | |
59 | [EXTCON_HEADPHONE_OUT] = "Headphone", | |
60 | [EXTCON_SPDIF_IN] = "SPDIF-in", | |
61 | [EXTCON_SPDIF_OUT] = "SPDIF-out", | |
62 | [EXTCON_VIDEO_IN] = "Video-in", | |
63 | [EXTCON_VIDEO_OUT] = "Video-out", | |
0e1507c8 | 64 | [EXTCON_MECHANICAL] = "Mechanical", |
806d9dd7 MH |
65 | |
66 | NULL, | |
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 | |
79 | * condition. | |
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++) { | |
94 | int count = 0, j; | |
95 | u32 correspondants = new_state & edev->mutually_exclusive[i]; | |
96 | u32 exp = 1; | |
97 | ||
98 | for (j = 0; j < 32; j++) { | |
99 | if (exp & correspondants) | |
100 | count++; | |
101 | if (count > 1) | |
102 | return i + 1; | |
103 | exp <<= 1; | |
104 | } | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
de55d871 MH |
110 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
111 | char *buf) | |
112 | { | |
806d9dd7 | 113 | int i, count = 0; |
de55d871 MH |
114 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); |
115 | ||
116 | if (edev->print_state) { | |
117 | int ret = edev->print_state(edev, buf); | |
118 | ||
119 | if (ret >= 0) | |
120 | return ret; | |
121 | /* Use default if failed */ | |
122 | } | |
806d9dd7 MH |
123 | |
124 | if (edev->max_supported == 0) | |
125 | return sprintf(buf, "%u\n", edev->state); | |
126 | ||
127 | for (i = 0; i < SUPPORTED_CABLE_MAX; i++) { | |
128 | if (!edev->supported_cable[i]) | |
129 | break; | |
130 | count += sprintf(buf + count, "%s=%d\n", | |
131 | edev->supported_cable[i], | |
132 | !!(edev->state & (1 << i))); | |
133 | } | |
134 | ||
135 | return count; | |
136 | } | |
137 | ||
bde68e60 | 138 | int extcon_set_state(struct extcon_dev *edev, u32 state); |
806d9dd7 MH |
139 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
140 | const char *buf, size_t count) | |
141 | { | |
142 | u32 state; | |
143 | ssize_t ret = 0; | |
144 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); | |
145 | ||
146 | ret = sscanf(buf, "0x%x", &state); | |
147 | if (ret == 0) | |
148 | ret = -EINVAL; | |
149 | else | |
bde68e60 | 150 | ret = extcon_set_state(edev, state); |
806d9dd7 MH |
151 | |
152 | if (ret < 0) | |
153 | return ret; | |
154 | ||
155 | return count; | |
de55d871 MH |
156 | } |
157 | ||
158 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
159 | char *buf) | |
160 | { | |
161 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); | |
162 | ||
163 | /* Optional callback given by the user */ | |
164 | if (edev->print_name) { | |
165 | int ret = edev->print_name(edev, buf); | |
166 | if (ret >= 0) | |
167 | return ret; | |
168 | } | |
169 | ||
170 | return sprintf(buf, "%s\n", dev_name(edev->dev)); | |
171 | } | |
172 | ||
806d9dd7 MH |
173 | static ssize_t cable_name_show(struct device *dev, |
174 | struct device_attribute *attr, char *buf) | |
175 | { | |
176 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
177 | attr_name); | |
178 | ||
179 | return sprintf(buf, "%s\n", | |
180 | cable->edev->supported_cable[cable->cable_index]); | |
181 | } | |
182 | ||
183 | static ssize_t cable_state_show(struct device *dev, | |
184 | struct device_attribute *attr, char *buf) | |
185 | { | |
186 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
187 | attr_state); | |
188 | ||
189 | return sprintf(buf, "%d\n", | |
190 | extcon_get_cable_state_(cable->edev, | |
191 | cable->cable_index)); | |
192 | } | |
193 | ||
194 | static ssize_t cable_state_store(struct device *dev, | |
195 | struct device_attribute *attr, const char *buf, | |
196 | size_t count) | |
197 | { | |
198 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
199 | attr_state); | |
200 | int ret, state; | |
201 | ||
202 | ret = sscanf(buf, "%d", &state); | |
203 | if (ret == 0) | |
204 | ret = -EINVAL; | |
205 | else | |
206 | ret = extcon_set_cable_state_(cable->edev, cable->cable_index, | |
207 | state); | |
208 | ||
209 | if (ret < 0) | |
210 | return ret; | |
211 | return count; | |
212 | } | |
213 | ||
de55d871 | 214 | /** |
806d9dd7 MH |
215 | * extcon_update_state() - Update the cable attach states of the extcon device |
216 | * only for the masked bits. | |
de55d871 | 217 | * @edev: the extcon device |
806d9dd7 | 218 | * @mask: the bit mask to designate updated bits. |
de55d871 MH |
219 | * @state: new cable attach status for @edev |
220 | * | |
221 | * Changing the state sends uevent with environment variable containing | |
222 | * the name of extcon device (envp[0]) and the state output (envp[1]). | |
223 | * Tizen uses this format for extcon device to get events from ports. | |
224 | * Android uses this format as well. | |
74c5d09b | 225 | * |
806d9dd7 MH |
226 | * Note that the notifier provides which bits are changed in the state |
227 | * variable with the val parameter (second) to the callback. | |
de55d871 | 228 | */ |
bde68e60 | 229 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
de55d871 MH |
230 | { |
231 | char name_buf[120]; | |
232 | char state_buf[120]; | |
233 | char *prop_buf; | |
234 | char *envp[3]; | |
235 | int env_offset = 0; | |
236 | int length; | |
806d9dd7 | 237 | unsigned long flags; |
de55d871 | 238 | |
806d9dd7 | 239 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 240 | |
806d9dd7 MH |
241 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
242 | u32 old_state = edev->state; | |
74c5d09b | 243 | |
bde68e60 MH |
244 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
245 | (state & mask))) { | |
246 | spin_unlock_irqrestore(&edev->lock, flags); | |
247 | return -EPERM; | |
248 | } | |
249 | ||
806d9dd7 MH |
250 | edev->state &= ~mask; |
251 | edev->state |= state & mask; | |
252 | ||
253 | raw_notifier_call_chain(&edev->nh, old_state, edev); | |
254 | ||
255 | /* This could be in interrupt handler */ | |
256 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
de55d871 MH |
257 | if (prop_buf) { |
258 | length = name_show(edev->dev, NULL, prop_buf); | |
259 | if (length > 0) { | |
260 | if (prop_buf[length - 1] == '\n') | |
261 | prop_buf[length - 1] = 0; | |
262 | snprintf(name_buf, sizeof(name_buf), | |
263 | "NAME=%s", prop_buf); | |
264 | envp[env_offset++] = name_buf; | |
265 | } | |
266 | length = state_show(edev->dev, NULL, prop_buf); | |
267 | if (length > 0) { | |
268 | if (prop_buf[length - 1] == '\n') | |
269 | prop_buf[length - 1] = 0; | |
270 | snprintf(state_buf, sizeof(state_buf), | |
271 | "STATE=%s", prop_buf); | |
272 | envp[env_offset++] = state_buf; | |
273 | } | |
274 | envp[env_offset] = NULL; | |
806d9dd7 MH |
275 | /* Unlock early before uevent */ |
276 | spin_unlock_irqrestore(&edev->lock, flags); | |
277 | ||
de55d871 MH |
278 | kobject_uevent_env(&edev->dev->kobj, KOBJ_CHANGE, envp); |
279 | free_page((unsigned long)prop_buf); | |
280 | } else { | |
806d9dd7 MH |
281 | /* Unlock early before uevent */ |
282 | spin_unlock_irqrestore(&edev->lock, flags); | |
283 | ||
de55d871 MH |
284 | dev_err(edev->dev, "out of memory in extcon_set_state\n"); |
285 | kobject_uevent(&edev->dev->kobj, KOBJ_CHANGE); | |
286 | } | |
806d9dd7 MH |
287 | } else { |
288 | /* No changes */ | |
289 | spin_unlock_irqrestore(&edev->lock, flags); | |
de55d871 | 290 | } |
bde68e60 MH |
291 | |
292 | return 0; | |
de55d871 | 293 | } |
806d9dd7 MH |
294 | EXPORT_SYMBOL_GPL(extcon_update_state); |
295 | ||
296 | /** | |
297 | * extcon_set_state() - Set the cable attach states of the extcon device. | |
298 | * @edev: the extcon device | |
299 | * @state: new cable attach status for @edev | |
300 | * | |
301 | * Note that notifier provides which bits are changed in the state | |
302 | * variable with the val parameter (second) to the callback. | |
303 | */ | |
bde68e60 | 304 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
806d9dd7 | 305 | { |
bde68e60 | 306 | return extcon_update_state(edev, 0xffffffff, state); |
806d9dd7 | 307 | } |
de55d871 MH |
308 | EXPORT_SYMBOL_GPL(extcon_set_state); |
309 | ||
806d9dd7 MH |
310 | /** |
311 | * extcon_find_cable_index() - Get the cable index based on the cable name. | |
312 | * @edev: the extcon device that has the cable. | |
313 | * @cable_name: cable name to be searched. | |
314 | * | |
315 | * Note that accessing a cable state based on cable_index is faster than | |
316 | * cable_name because using cable_name induces a loop with strncmp(). | |
317 | * Thus, when get/set_cable_state is repeatedly used, using cable_index | |
318 | * is recommended. | |
319 | */ | |
320 | int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) | |
321 | { | |
322 | int i; | |
323 | ||
324 | if (edev->supported_cable) { | |
325 | for (i = 0; edev->supported_cable[i]; i++) { | |
326 | if (!strncmp(edev->supported_cable[i], | |
327 | cable_name, CABLE_NAME_MAX)) | |
328 | return i; | |
329 | } | |
330 | } | |
331 | ||
332 | return -EINVAL; | |
333 | } | |
334 | EXPORT_SYMBOL_GPL(extcon_find_cable_index); | |
335 | ||
336 | /** | |
337 | * extcon_get_cable_state_() - Get the status of a specific cable. | |
338 | * @edev: the extcon device that has the cable. | |
339 | * @index: cable index that can be retrieved by extcon_find_cable_index(). | |
340 | */ | |
341 | int extcon_get_cable_state_(struct extcon_dev *edev, int index) | |
342 | { | |
343 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
344 | return -EINVAL; | |
345 | ||
346 | return !!(edev->state & (1 << index)); | |
347 | } | |
348 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); | |
349 | ||
350 | /** | |
351 | * extcon_get_cable_state() - Get the status of a specific cable. | |
352 | * @edev: the extcon device that has the cable. | |
353 | * @cable_name: cable name. | |
354 | * | |
355 | * Note that this is slower than extcon_get_cable_state_. | |
356 | */ | |
357 | int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) | |
358 | { | |
359 | return extcon_get_cable_state_(edev, extcon_find_cable_index | |
360 | (edev, cable_name)); | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(extcon_get_cable_state); | |
363 | ||
364 | /** | |
365 | * extcon_get_cable_state_() - Set the status of a specific cable. | |
366 | * @edev: the extcon device that has the cable. | |
367 | * @index: cable index that can be retrieved by extcon_find_cable_index(). | |
368 | * @cable_state: the new cable status. The default semantics is | |
369 | * true: attached / false: detached. | |
370 | */ | |
371 | int extcon_set_cable_state_(struct extcon_dev *edev, | |
372 | int index, bool cable_state) | |
373 | { | |
374 | u32 state; | |
375 | ||
376 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
377 | return -EINVAL; | |
378 | ||
379 | state = cable_state ? (1 << index) : 0; | |
bde68e60 | 380 | return extcon_update_state(edev, 1 << index, state); |
806d9dd7 MH |
381 | } |
382 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); | |
383 | ||
384 | /** | |
385 | * extcon_get_cable_state() - Set the status of a specific cable. | |
386 | * @edev: the extcon device that has the cable. | |
387 | * @cable_name: cable name. | |
388 | * @cable_state: the new cable status. The default semantics is | |
389 | * true: attached / false: detached. | |
390 | * | |
391 | * Note that this is slower than extcon_set_cable_state_. | |
392 | */ | |
393 | int extcon_set_cable_state(struct extcon_dev *edev, | |
394 | const char *cable_name, bool cable_state) | |
395 | { | |
396 | return extcon_set_cable_state_(edev, extcon_find_cable_index | |
397 | (edev, cable_name), cable_state); | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(extcon_set_cable_state); | |
400 | ||
74c5d09b DK |
401 | /** |
402 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
403 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
404 | */ | |
405 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
406 | { | |
407 | struct extcon_dev *sd; | |
408 | ||
409 | mutex_lock(&extcon_dev_list_lock); | |
410 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
411 | if (!strcmp(sd->name, extcon_name)) | |
412 | goto out; | |
413 | } | |
414 | sd = NULL; | |
415 | out: | |
416 | mutex_unlock(&extcon_dev_list_lock); | |
417 | return sd; | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
420 | ||
806d9dd7 MH |
421 | static int _call_per_cable(struct notifier_block *nb, unsigned long val, |
422 | void *ptr) | |
423 | { | |
424 | struct extcon_specific_cable_nb *obj = container_of(nb, | |
425 | struct extcon_specific_cable_nb, internal_nb); | |
426 | struct extcon_dev *edev = ptr; | |
427 | ||
428 | if ((val & (1 << obj->cable_index)) != | |
429 | (edev->state & (1 << obj->cable_index))) { | |
f4cce696 CC |
430 | bool cable_state = true; |
431 | ||
806d9dd7 | 432 | obj->previous_value = val; |
f4cce696 CC |
433 | |
434 | if (val & (1 << obj->cable_index)) | |
435 | cable_state = false; | |
436 | ||
437 | return obj->user_nb->notifier_call(obj->user_nb, | |
438 | cable_state, ptr); | |
806d9dd7 MH |
439 | } |
440 | ||
441 | return NOTIFY_OK; | |
442 | } | |
443 | ||
444 | /** | |
445 | * extcon_register_interest() - Register a notifier for a state change of a | |
c338bb03 | 446 | * specific cable, not an entier set of cables of a |
806d9dd7 MH |
447 | * extcon device. |
448 | * @obj: an empty extcon_specific_cable_nb object to be returned. | |
449 | * @extcon_name: the name of extcon device. | |
450 | * @cable_name: the target cable name. | |
451 | * @nb: the notifier block to get notified. | |
452 | * | |
453 | * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets | |
454 | * the struct for you. | |
455 | * | |
456 | * extcon_register_interest is a helper function for those who want to get | |
457 | * notification for a single specific cable's status change. If a user wants | |
458 | * to get notification for any changes of all cables of a extcon device, | |
459 | * he/she should use the general extcon_register_notifier(). | |
460 | * | |
461 | * Note that the second parameter given to the callback of nb (val) is | |
462 | * "old_state", not the current state. The current state can be retrieved | |
463 | * by looking at the third pameter (edev pointer)'s state value. | |
464 | */ | |
465 | int extcon_register_interest(struct extcon_specific_cable_nb *obj, | |
466 | const char *extcon_name, const char *cable_name, | |
467 | struct notifier_block *nb) | |
468 | { | |
469 | if (!obj || !extcon_name || !cable_name || !nb) | |
470 | return -EINVAL; | |
471 | ||
472 | obj->edev = extcon_get_extcon_dev(extcon_name); | |
473 | if (!obj->edev) | |
474 | return -ENODEV; | |
475 | ||
476 | obj->cable_index = extcon_find_cable_index(obj->edev, cable_name); | |
477 | if (obj->cable_index < 0) | |
478 | return -ENODEV; | |
479 | ||
480 | obj->user_nb = nb; | |
481 | ||
482 | obj->internal_nb.notifier_call = _call_per_cable; | |
483 | ||
484 | return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb); | |
485 | } | |
486 | ||
487 | /** | |
488 | * extcon_unregister_interest() - Unregister the notifier registered by | |
489 | * extcon_register_interest(). | |
490 | * @obj: the extcon_specific_cable_nb object returned by | |
491 | * extcon_register_interest(). | |
492 | */ | |
493 | int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) | |
494 | { | |
495 | if (!obj) | |
496 | return -EINVAL; | |
497 | ||
498 | return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); | |
499 | } | |
500 | ||
74c5d09b | 501 | /** |
c338bb03 | 502 | * extcon_register_notifier() - Register a notifiee to get notified by |
74c5d09b DK |
503 | * any attach status changes from the extcon. |
504 | * @edev: the extcon device. | |
505 | * @nb: a notifier block to be registered. | |
806d9dd7 MH |
506 | * |
507 | * Note that the second parameter given to the callback of nb (val) is | |
508 | * "old_state", not the current state. The current state can be retrieved | |
509 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b DK |
510 | */ |
511 | int extcon_register_notifier(struct extcon_dev *edev, | |
512 | struct notifier_block *nb) | |
513 | { | |
514 | return raw_notifier_chain_register(&edev->nh, nb); | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
517 | ||
518 | /** | |
c338bb03 | 519 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
74c5d09b DK |
520 | * @edev: the extcon device. |
521 | * @nb: a registered notifier block to be unregistered. | |
522 | */ | |
523 | int extcon_unregister_notifier(struct extcon_dev *edev, | |
524 | struct notifier_block *nb) | |
525 | { | |
526 | return raw_notifier_chain_unregister(&edev->nh, nb); | |
527 | } | |
528 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
529 | ||
de55d871 | 530 | static struct device_attribute extcon_attrs[] = { |
806d9dd7 | 531 | __ATTR(state, S_IRUGO | S_IWUSR, state_show, state_store), |
de55d871 | 532 | __ATTR_RO(name), |
806d9dd7 | 533 | __ATTR_NULL, |
de55d871 MH |
534 | }; |
535 | ||
536 | static int create_extcon_class(void) | |
537 | { | |
538 | if (!extcon_class) { | |
539 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
540 | if (IS_ERR(extcon_class)) | |
541 | return PTR_ERR(extcon_class); | |
542 | extcon_class->dev_attrs = extcon_attrs; | |
543 | ||
449a2bf5 | 544 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
545 | switch_class = class_compat_register("switch"); |
546 | if (WARN(!switch_class, "cannot allocate")) | |
547 | return -ENOMEM; | |
449a2bf5 | 548 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
549 | } |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | static void extcon_cleanup(struct extcon_dev *edev, bool skip) | |
555 | { | |
74c5d09b DK |
556 | mutex_lock(&extcon_dev_list_lock); |
557 | list_del(&edev->entry); | |
558 | mutex_unlock(&extcon_dev_list_lock); | |
559 | ||
de55d871 | 560 | if (!skip && get_device(edev->dev)) { |
806d9dd7 MH |
561 | int index; |
562 | ||
bde68e60 MH |
563 | if (edev->mutually_exclusive && edev->max_supported) { |
564 | for (index = 0; edev->mutually_exclusive[index]; | |
565 | index++) | |
566 | kfree(edev->d_attrs_muex[index].attr.name); | |
567 | kfree(edev->d_attrs_muex); | |
568 | kfree(edev->attrs_muex); | |
569 | } | |
570 | ||
806d9dd7 MH |
571 | for (index = 0; index < edev->max_supported; index++) |
572 | kfree(edev->cables[index].attr_g.name); | |
573 | ||
574 | if (edev->max_supported) { | |
575 | kfree(edev->extcon_dev_type.groups); | |
576 | kfree(edev->cables); | |
577 | } | |
578 | ||
de55d871 MH |
579 | device_unregister(edev->dev); |
580 | put_device(edev->dev); | |
581 | } | |
582 | ||
583 | kfree(edev->dev); | |
584 | } | |
585 | ||
586 | static void extcon_dev_release(struct device *dev) | |
587 | { | |
588 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); | |
589 | ||
590 | extcon_cleanup(edev, true); | |
591 | } | |
592 | ||
bde68e60 | 593 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
594 | static void dummy_sysfs_dev_release(struct device *dev) |
595 | { | |
596 | } | |
597 | ||
de55d871 MH |
598 | /** |
599 | * extcon_dev_register() - Register a new extcon device | |
600 | * @edev : the new extcon device (should be allocated before calling) | |
601 | * @dev : the parent device for this extcon device. | |
602 | * | |
603 | * Among the members of edev struct, please set the "user initializing data" | |
604 | * in any case and set the "optional callbacks" if required. However, please | |
605 | * do not set the values of "internal data", which are initialized by | |
606 | * this function. | |
607 | */ | |
608 | int extcon_dev_register(struct extcon_dev *edev, struct device *dev) | |
609 | { | |
806d9dd7 | 610 | int ret, index = 0; |
de55d871 MH |
611 | |
612 | if (!extcon_class) { | |
613 | ret = create_extcon_class(); | |
614 | if (ret < 0) | |
615 | return ret; | |
616 | } | |
617 | ||
806d9dd7 MH |
618 | if (edev->supported_cable) { |
619 | /* Get size of array */ | |
620 | for (index = 0; edev->supported_cable[index]; index++) | |
621 | ; | |
622 | edev->max_supported = index; | |
623 | } else { | |
624 | edev->max_supported = 0; | |
625 | } | |
626 | ||
627 | if (index > SUPPORTED_CABLE_MAX) { | |
628 | dev_err(edev->dev, "extcon: maximum number of supported cables exceeded.\n"); | |
629 | return -EINVAL; | |
630 | } | |
631 | ||
de55d871 | 632 | edev->dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
a1d26ac0 DC |
633 | if (!edev->dev) |
634 | return -ENOMEM; | |
de55d871 MH |
635 | edev->dev->parent = dev; |
636 | edev->dev->class = extcon_class; | |
637 | edev->dev->release = extcon_dev_release; | |
638 | ||
639 | dev_set_name(edev->dev, edev->name ? edev->name : dev_name(dev)); | |
806d9dd7 MH |
640 | |
641 | if (edev->max_supported) { | |
642 | char buf[10]; | |
643 | char *str; | |
644 | struct extcon_cable *cable; | |
645 | ||
646 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
647 | edev->max_supported, GFP_KERNEL); | |
648 | if (!edev->cables) { | |
649 | ret = -ENOMEM; | |
650 | goto err_sysfs_alloc; | |
651 | } | |
652 | for (index = 0; index < edev->max_supported; index++) { | |
653 | cable = &edev->cables[index]; | |
654 | ||
655 | snprintf(buf, 10, "cable.%d", index); | |
656 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
657 | GFP_KERNEL); | |
658 | if (!str) { | |
659 | for (index--; index >= 0; index--) { | |
660 | cable = &edev->cables[index]; | |
661 | kfree(cable->attr_g.name); | |
662 | } | |
663 | ret = -ENOMEM; | |
664 | ||
665 | goto err_alloc_cables; | |
666 | } | |
667 | strcpy(str, buf); | |
668 | ||
669 | cable->edev = edev; | |
670 | cable->cable_index = index; | |
671 | cable->attrs[0] = &cable->attr_name.attr; | |
672 | cable->attrs[1] = &cable->attr_state.attr; | |
673 | cable->attrs[2] = NULL; | |
674 | cable->attr_g.name = str; | |
675 | cable->attr_g.attrs = cable->attrs; | |
676 | ||
9baf3220 | 677 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
678 | cable->attr_name.attr.name = "name"; |
679 | cable->attr_name.attr.mode = 0444; | |
680 | cable->attr_name.show = cable_name_show; | |
681 | ||
9baf3220 | 682 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 MH |
683 | cable->attr_state.attr.name = "state"; |
684 | cable->attr_state.attr.mode = 0644; | |
685 | cable->attr_state.show = cable_state_show; | |
686 | cable->attr_state.store = cable_state_store; | |
687 | } | |
688 | } | |
689 | ||
bde68e60 MH |
690 | if (edev->max_supported && edev->mutually_exclusive) { |
691 | char buf[80]; | |
692 | char *name; | |
693 | ||
694 | /* Count the size of mutually_exclusive array */ | |
695 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
696 | ; | |
697 | ||
698 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
699 | (index + 1), GFP_KERNEL); | |
700 | if (!edev->attrs_muex) { | |
701 | ret = -ENOMEM; | |
702 | goto err_muex; | |
703 | } | |
704 | ||
705 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
706 | index, GFP_KERNEL); | |
707 | if (!edev->d_attrs_muex) { | |
708 | ret = -ENOMEM; | |
709 | kfree(edev->attrs_muex); | |
710 | goto err_muex; | |
711 | } | |
712 | ||
713 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
714 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
715 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
716 | GFP_KERNEL); | |
717 | if (!name) { | |
718 | for (index--; index >= 0; index--) { | |
719 | kfree(edev->d_attrs_muex[index].attr. | |
720 | name); | |
721 | } | |
722 | kfree(edev->d_attrs_muex); | |
723 | kfree(edev->attrs_muex); | |
724 | ret = -ENOMEM; | |
725 | goto err_muex; | |
726 | } | |
727 | strcpy(name, buf); | |
9baf3220 | 728 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
729 | edev->d_attrs_muex[index].attr.name = name; |
730 | edev->d_attrs_muex[index].attr.mode = 0000; | |
731 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
732 | .attr; | |
733 | } | |
734 | edev->attr_g_muex.name = muex_name; | |
735 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
736 | ||
737 | } | |
738 | ||
806d9dd7 MH |
739 | if (edev->max_supported) { |
740 | edev->extcon_dev_type.groups = | |
741 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 742 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
743 | if (!edev->extcon_dev_type.groups) { |
744 | ret = -ENOMEM; | |
745 | goto err_alloc_groups; | |
746 | } | |
747 | ||
748 | edev->extcon_dev_type.name = dev_name(edev->dev); | |
749 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; | |
750 | ||
751 | for (index = 0; index < edev->max_supported; index++) | |
752 | edev->extcon_dev_type.groups[index] = | |
753 | &edev->cables[index].attr_g; | |
bde68e60 MH |
754 | if (edev->mutually_exclusive) |
755 | edev->extcon_dev_type.groups[index] = | |
756 | &edev->attr_g_muex; | |
806d9dd7 MH |
757 | |
758 | edev->dev->type = &edev->extcon_dev_type; | |
759 | } | |
760 | ||
de55d871 MH |
761 | ret = device_register(edev->dev); |
762 | if (ret) { | |
763 | put_device(edev->dev); | |
764 | goto err_dev; | |
765 | } | |
449a2bf5 | 766 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
767 | if (switch_class) |
768 | ret = class_compat_create_link(switch_class, edev->dev, | |
c3b15452 | 769 | NULL); |
449a2bf5 | 770 | #endif /* CONFIG_ANDROID */ |
de55d871 | 771 | |
806d9dd7 MH |
772 | spin_lock_init(&edev->lock); |
773 | ||
74c5d09b DK |
774 | RAW_INIT_NOTIFIER_HEAD(&edev->nh); |
775 | ||
de55d871 MH |
776 | dev_set_drvdata(edev->dev, edev); |
777 | edev->state = 0; | |
74c5d09b DK |
778 | |
779 | mutex_lock(&extcon_dev_list_lock); | |
780 | list_add(&edev->entry, &extcon_dev_list); | |
781 | mutex_unlock(&extcon_dev_list_lock); | |
782 | ||
de55d871 MH |
783 | return 0; |
784 | ||
785 | err_dev: | |
806d9dd7 MH |
786 | if (edev->max_supported) |
787 | kfree(edev->extcon_dev_type.groups); | |
788 | err_alloc_groups: | |
bde68e60 MH |
789 | if (edev->max_supported && edev->mutually_exclusive) { |
790 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
791 | kfree(edev->d_attrs_muex[index].attr.name); | |
792 | kfree(edev->d_attrs_muex); | |
793 | kfree(edev->attrs_muex); | |
794 | } | |
795 | err_muex: | |
806d9dd7 MH |
796 | for (index = 0; index < edev->max_supported; index++) |
797 | kfree(edev->cables[index].attr_g.name); | |
798 | err_alloc_cables: | |
799 | if (edev->max_supported) | |
800 | kfree(edev->cables); | |
801 | err_sysfs_alloc: | |
de55d871 MH |
802 | kfree(edev->dev); |
803 | return ret; | |
804 | } | |
805 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
806 | ||
807 | /** | |
808 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 809 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
810 | * |
811 | * Note that this does not call kfree(edev) because edev was not allocated | |
812 | * by this class. | |
813 | */ | |
814 | void extcon_dev_unregister(struct extcon_dev *edev) | |
815 | { | |
816 | extcon_cleanup(edev, false); | |
817 | } | |
818 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
819 | ||
820 | static int __init extcon_class_init(void) | |
821 | { | |
822 | return create_extcon_class(); | |
823 | } | |
824 | module_init(extcon_class_init); | |
825 | ||
826 | static void __exit extcon_class_exit(void) | |
827 | { | |
828 | class_destroy(extcon_class); | |
829 | } | |
830 | module_exit(extcon_class_exit); | |
831 | ||
832 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); | |
833 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
834 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
835 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
836 | MODULE_LICENSE("GPL"); |