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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> | |
33 | ||
806d9dd7 MH |
34 | /* |
35 | * extcon_cable_name suggests the standard cable names for commonly used | |
36 | * cable types. | |
37 | * | |
38 | * However, please do not use extcon_cable_name directly for extcon_dev | |
39 | * struct's supported_cable pointer unless your device really supports | |
40 | * every single port-type of the following cable names. Please choose cable | |
41 | * names that are actually used in your extcon device. | |
42 | */ | |
43 | const char *extcon_cable_name[] = { | |
44 | [EXTCON_USB] = "USB", | |
45 | [EXTCON_USB_HOST] = "USB-Host", | |
46 | [EXTCON_TA] = "TA", | |
47 | [EXTCON_FAST_CHARGER] = "Fast-charger", | |
48 | [EXTCON_SLOW_CHARGER] = "Slow-charger", | |
49 | [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream", | |
50 | [EXTCON_HDMI] = "HDMI", | |
51 | [EXTCON_MHL] = "MHL", | |
52 | [EXTCON_DVI] = "DVI", | |
53 | [EXTCON_VGA] = "VGA", | |
54 | [EXTCON_DOCK] = "Dock", | |
55 | [EXTCON_LINE_IN] = "Line-in", | |
56 | [EXTCON_LINE_OUT] = "Line-out", | |
57 | [EXTCON_MIC_IN] = "Microphone", | |
58 | [EXTCON_HEADPHONE_OUT] = "Headphone", | |
59 | [EXTCON_SPDIF_IN] = "SPDIF-in", | |
60 | [EXTCON_SPDIF_OUT] = "SPDIF-out", | |
61 | [EXTCON_VIDEO_IN] = "Video-in", | |
62 | [EXTCON_VIDEO_OUT] = "Video-out", | |
0e1507c8 | 63 | [EXTCON_MECHANICAL] = "Mechanical", |
806d9dd7 MH |
64 | |
65 | NULL, | |
66 | }; | |
67 | ||
de55d871 | 68 | struct class *extcon_class; |
449a2bf5 | 69 | #if defined(CONFIG_ANDROID) |
de55d871 | 70 | static struct class_compat *switch_class; |
449a2bf5 | 71 | #endif /* CONFIG_ANDROID */ |
de55d871 | 72 | |
74c5d09b DK |
73 | static LIST_HEAD(extcon_dev_list); |
74 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
75 | ||
bde68e60 MH |
76 | /** |
77 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
78 | * condition. | |
79 | * @edev: the extcon device | |
80 | * @new_state: new cable attach status for @edev | |
81 | * | |
82 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
83 | * violated condition. | |
84 | */ | |
85 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
86 | { | |
87 | int i = 0; | |
88 | ||
89 | if (!edev->mutually_exclusive) | |
90 | return 0; | |
91 | ||
92 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
93 | int count = 0, j; | |
94 | u32 correspondants = new_state & edev->mutually_exclusive[i]; | |
95 | u32 exp = 1; | |
96 | ||
97 | for (j = 0; j < 32; j++) { | |
98 | if (exp & correspondants) | |
99 | count++; | |
100 | if (count > 1) | |
101 | return i + 1; | |
102 | exp <<= 1; | |
103 | } | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
de55d871 MH |
109 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
110 | char *buf) | |
111 | { | |
806d9dd7 | 112 | int i, count = 0; |
de55d871 MH |
113 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); |
114 | ||
115 | if (edev->print_state) { | |
116 | int ret = edev->print_state(edev, buf); | |
117 | ||
118 | if (ret >= 0) | |
119 | return ret; | |
120 | /* Use default if failed */ | |
121 | } | |
806d9dd7 MH |
122 | |
123 | if (edev->max_supported == 0) | |
124 | return sprintf(buf, "%u\n", edev->state); | |
125 | ||
126 | for (i = 0; i < SUPPORTED_CABLE_MAX; i++) { | |
127 | if (!edev->supported_cable[i]) | |
128 | break; | |
129 | count += sprintf(buf + count, "%s=%d\n", | |
130 | edev->supported_cable[i], | |
131 | !!(edev->state & (1 << i))); | |
132 | } | |
133 | ||
134 | return count; | |
135 | } | |
136 | ||
bde68e60 | 137 | int extcon_set_state(struct extcon_dev *edev, u32 state); |
806d9dd7 MH |
138 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
139 | const char *buf, size_t count) | |
140 | { | |
141 | u32 state; | |
142 | ssize_t ret = 0; | |
143 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); | |
144 | ||
145 | ret = sscanf(buf, "0x%x", &state); | |
146 | if (ret == 0) | |
147 | ret = -EINVAL; | |
148 | else | |
bde68e60 | 149 | ret = extcon_set_state(edev, state); |
806d9dd7 MH |
150 | |
151 | if (ret < 0) | |
152 | return ret; | |
153 | ||
154 | return count; | |
de55d871 MH |
155 | } |
156 | ||
157 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
158 | char *buf) | |
159 | { | |
160 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); | |
161 | ||
162 | /* Optional callback given by the user */ | |
163 | if (edev->print_name) { | |
164 | int ret = edev->print_name(edev, buf); | |
165 | if (ret >= 0) | |
166 | return ret; | |
167 | } | |
168 | ||
169 | return sprintf(buf, "%s\n", dev_name(edev->dev)); | |
170 | } | |
171 | ||
806d9dd7 MH |
172 | static ssize_t cable_name_show(struct device *dev, |
173 | struct device_attribute *attr, char *buf) | |
174 | { | |
175 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
176 | attr_name); | |
177 | ||
178 | return sprintf(buf, "%s\n", | |
179 | cable->edev->supported_cable[cable->cable_index]); | |
180 | } | |
181 | ||
182 | static ssize_t cable_state_show(struct device *dev, | |
183 | struct device_attribute *attr, char *buf) | |
184 | { | |
185 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
186 | attr_state); | |
187 | ||
188 | return sprintf(buf, "%d\n", | |
189 | extcon_get_cable_state_(cable->edev, | |
190 | cable->cable_index)); | |
191 | } | |
192 | ||
193 | static ssize_t cable_state_store(struct device *dev, | |
194 | struct device_attribute *attr, const char *buf, | |
195 | size_t count) | |
196 | { | |
197 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
198 | attr_state); | |
199 | int ret, state; | |
200 | ||
201 | ret = sscanf(buf, "%d", &state); | |
202 | if (ret == 0) | |
203 | ret = -EINVAL; | |
204 | else | |
205 | ret = extcon_set_cable_state_(cable->edev, cable->cable_index, | |
206 | state); | |
207 | ||
208 | if (ret < 0) | |
209 | return ret; | |
210 | return count; | |
211 | } | |
212 | ||
de55d871 | 213 | /** |
806d9dd7 MH |
214 | * extcon_update_state() - Update the cable attach states of the extcon device |
215 | * only for the masked bits. | |
de55d871 | 216 | * @edev: the extcon device |
806d9dd7 | 217 | * @mask: the bit mask to designate updated bits. |
de55d871 MH |
218 | * @state: new cable attach status for @edev |
219 | * | |
220 | * Changing the state sends uevent with environment variable containing | |
221 | * the name of extcon device (envp[0]) and the state output (envp[1]). | |
222 | * Tizen uses this format for extcon device to get events from ports. | |
223 | * Android uses this format as well. | |
74c5d09b | 224 | * |
806d9dd7 MH |
225 | * Note that the notifier provides which bits are changed in the state |
226 | * variable with the val parameter (second) to the callback. | |
de55d871 | 227 | */ |
bde68e60 | 228 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
de55d871 MH |
229 | { |
230 | char name_buf[120]; | |
231 | char state_buf[120]; | |
232 | char *prop_buf; | |
233 | char *envp[3]; | |
234 | int env_offset = 0; | |
235 | int length; | |
806d9dd7 | 236 | unsigned long flags; |
de55d871 | 237 | |
806d9dd7 | 238 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 239 | |
806d9dd7 MH |
240 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
241 | u32 old_state = edev->state; | |
74c5d09b | 242 | |
bde68e60 MH |
243 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
244 | (state & mask))) { | |
245 | spin_unlock_irqrestore(&edev->lock, flags); | |
246 | return -EPERM; | |
247 | } | |
248 | ||
806d9dd7 MH |
249 | edev->state &= ~mask; |
250 | edev->state |= state & mask; | |
251 | ||
252 | raw_notifier_call_chain(&edev->nh, old_state, edev); | |
253 | ||
254 | /* This could be in interrupt handler */ | |
255 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
de55d871 MH |
256 | if (prop_buf) { |
257 | length = name_show(edev->dev, NULL, prop_buf); | |
258 | if (length > 0) { | |
259 | if (prop_buf[length - 1] == '\n') | |
260 | prop_buf[length - 1] = 0; | |
261 | snprintf(name_buf, sizeof(name_buf), | |
262 | "NAME=%s", prop_buf); | |
263 | envp[env_offset++] = name_buf; | |
264 | } | |
265 | length = state_show(edev->dev, NULL, prop_buf); | |
266 | if (length > 0) { | |
267 | if (prop_buf[length - 1] == '\n') | |
268 | prop_buf[length - 1] = 0; | |
269 | snprintf(state_buf, sizeof(state_buf), | |
270 | "STATE=%s", prop_buf); | |
271 | envp[env_offset++] = state_buf; | |
272 | } | |
273 | envp[env_offset] = NULL; | |
806d9dd7 MH |
274 | /* Unlock early before uevent */ |
275 | spin_unlock_irqrestore(&edev->lock, flags); | |
276 | ||
de55d871 MH |
277 | kobject_uevent_env(&edev->dev->kobj, KOBJ_CHANGE, envp); |
278 | free_page((unsigned long)prop_buf); | |
279 | } else { | |
806d9dd7 MH |
280 | /* Unlock early before uevent */ |
281 | spin_unlock_irqrestore(&edev->lock, flags); | |
282 | ||
de55d871 MH |
283 | dev_err(edev->dev, "out of memory in extcon_set_state\n"); |
284 | kobject_uevent(&edev->dev->kobj, KOBJ_CHANGE); | |
285 | } | |
806d9dd7 MH |
286 | } else { |
287 | /* No changes */ | |
288 | spin_unlock_irqrestore(&edev->lock, flags); | |
de55d871 | 289 | } |
bde68e60 MH |
290 | |
291 | return 0; | |
de55d871 | 292 | } |
806d9dd7 MH |
293 | EXPORT_SYMBOL_GPL(extcon_update_state); |
294 | ||
295 | /** | |
296 | * extcon_set_state() - Set the cable attach states of the extcon device. | |
297 | * @edev: the extcon device | |
298 | * @state: new cable attach status for @edev | |
299 | * | |
300 | * Note that notifier provides which bits are changed in the state | |
301 | * variable with the val parameter (second) to the callback. | |
302 | */ | |
bde68e60 | 303 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
806d9dd7 | 304 | { |
bde68e60 | 305 | return extcon_update_state(edev, 0xffffffff, state); |
806d9dd7 | 306 | } |
de55d871 MH |
307 | EXPORT_SYMBOL_GPL(extcon_set_state); |
308 | ||
806d9dd7 MH |
309 | /** |
310 | * extcon_find_cable_index() - Get the cable index based on the cable name. | |
311 | * @edev: the extcon device that has the cable. | |
312 | * @cable_name: cable name to be searched. | |
313 | * | |
314 | * Note that accessing a cable state based on cable_index is faster than | |
315 | * cable_name because using cable_name induces a loop with strncmp(). | |
316 | * Thus, when get/set_cable_state is repeatedly used, using cable_index | |
317 | * is recommended. | |
318 | */ | |
319 | int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) | |
320 | { | |
321 | int i; | |
322 | ||
323 | if (edev->supported_cable) { | |
324 | for (i = 0; edev->supported_cable[i]; i++) { | |
325 | if (!strncmp(edev->supported_cable[i], | |
326 | cable_name, CABLE_NAME_MAX)) | |
327 | return i; | |
328 | } | |
329 | } | |
330 | ||
331 | return -EINVAL; | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(extcon_find_cable_index); | |
334 | ||
335 | /** | |
336 | * extcon_get_cable_state_() - Get the status of a specific cable. | |
337 | * @edev: the extcon device that has the cable. | |
338 | * @index: cable index that can be retrieved by extcon_find_cable_index(). | |
339 | */ | |
340 | int extcon_get_cable_state_(struct extcon_dev *edev, int index) | |
341 | { | |
342 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
343 | return -EINVAL; | |
344 | ||
345 | return !!(edev->state & (1 << index)); | |
346 | } | |
347 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); | |
348 | ||
349 | /** | |
350 | * extcon_get_cable_state() - Get the status of a specific cable. | |
351 | * @edev: the extcon device that has the cable. | |
352 | * @cable_name: cable name. | |
353 | * | |
354 | * Note that this is slower than extcon_get_cable_state_. | |
355 | */ | |
356 | int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) | |
357 | { | |
358 | return extcon_get_cable_state_(edev, extcon_find_cable_index | |
359 | (edev, cable_name)); | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(extcon_get_cable_state); | |
362 | ||
363 | /** | |
364 | * extcon_get_cable_state_() - Set the status of a specific cable. | |
365 | * @edev: the extcon device that has the cable. | |
366 | * @index: cable index that can be retrieved by extcon_find_cable_index(). | |
367 | * @cable_state: the new cable status. The default semantics is | |
368 | * true: attached / false: detached. | |
369 | */ | |
370 | int extcon_set_cable_state_(struct extcon_dev *edev, | |
371 | int index, bool cable_state) | |
372 | { | |
373 | u32 state; | |
374 | ||
375 | if (index < 0 || (edev->max_supported && edev->max_supported <= index)) | |
376 | return -EINVAL; | |
377 | ||
378 | state = cable_state ? (1 << index) : 0; | |
bde68e60 | 379 | return extcon_update_state(edev, 1 << index, state); |
806d9dd7 MH |
380 | } |
381 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); | |
382 | ||
383 | /** | |
384 | * extcon_get_cable_state() - Set the status of a specific cable. | |
385 | * @edev: the extcon device that has the cable. | |
386 | * @cable_name: cable name. | |
387 | * @cable_state: the new cable status. The default semantics is | |
388 | * true: attached / false: detached. | |
389 | * | |
390 | * Note that this is slower than extcon_set_cable_state_. | |
391 | */ | |
392 | int extcon_set_cable_state(struct extcon_dev *edev, | |
393 | const char *cable_name, bool cable_state) | |
394 | { | |
395 | return extcon_set_cable_state_(edev, extcon_find_cable_index | |
396 | (edev, cable_name), cable_state); | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(extcon_set_cable_state); | |
399 | ||
74c5d09b DK |
400 | /** |
401 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
402 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
403 | */ | |
404 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
405 | { | |
406 | struct extcon_dev *sd; | |
407 | ||
408 | mutex_lock(&extcon_dev_list_lock); | |
409 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
410 | if (!strcmp(sd->name, extcon_name)) | |
411 | goto out; | |
412 | } | |
413 | sd = NULL; | |
414 | out: | |
415 | mutex_unlock(&extcon_dev_list_lock); | |
416 | return sd; | |
417 | } | |
418 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
419 | ||
806d9dd7 MH |
420 | static int _call_per_cable(struct notifier_block *nb, unsigned long val, |
421 | void *ptr) | |
422 | { | |
423 | struct extcon_specific_cable_nb *obj = container_of(nb, | |
424 | struct extcon_specific_cable_nb, internal_nb); | |
425 | struct extcon_dev *edev = ptr; | |
426 | ||
427 | if ((val & (1 << obj->cable_index)) != | |
428 | (edev->state & (1 << obj->cable_index))) { | |
f4cce696 CC |
429 | bool cable_state = true; |
430 | ||
806d9dd7 | 431 | obj->previous_value = val; |
f4cce696 CC |
432 | |
433 | if (val & (1 << obj->cable_index)) | |
434 | cable_state = false; | |
435 | ||
436 | return obj->user_nb->notifier_call(obj->user_nb, | |
437 | cable_state, ptr); | |
806d9dd7 MH |
438 | } |
439 | ||
440 | return NOTIFY_OK; | |
441 | } | |
442 | ||
443 | /** | |
444 | * extcon_register_interest() - Register a notifier for a state change of a | |
445 | * specific cable, not a entier set of cables of a | |
446 | * extcon device. | |
447 | * @obj: an empty extcon_specific_cable_nb object to be returned. | |
448 | * @extcon_name: the name of extcon device. | |
449 | * @cable_name: the target cable name. | |
450 | * @nb: the notifier block to get notified. | |
451 | * | |
452 | * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets | |
453 | * the struct for you. | |
454 | * | |
455 | * extcon_register_interest is a helper function for those who want to get | |
456 | * notification for a single specific cable's status change. If a user wants | |
457 | * to get notification for any changes of all cables of a extcon device, | |
458 | * he/she should use the general extcon_register_notifier(). | |
459 | * | |
460 | * Note that the second parameter given to the callback of nb (val) is | |
461 | * "old_state", not the current state. The current state can be retrieved | |
462 | * by looking at the third pameter (edev pointer)'s state value. | |
463 | */ | |
464 | int extcon_register_interest(struct extcon_specific_cable_nb *obj, | |
465 | const char *extcon_name, const char *cable_name, | |
466 | struct notifier_block *nb) | |
467 | { | |
468 | if (!obj || !extcon_name || !cable_name || !nb) | |
469 | return -EINVAL; | |
470 | ||
471 | obj->edev = extcon_get_extcon_dev(extcon_name); | |
472 | if (!obj->edev) | |
473 | return -ENODEV; | |
474 | ||
475 | obj->cable_index = extcon_find_cable_index(obj->edev, cable_name); | |
476 | if (obj->cable_index < 0) | |
477 | return -ENODEV; | |
478 | ||
479 | obj->user_nb = nb; | |
480 | ||
481 | obj->internal_nb.notifier_call = _call_per_cable; | |
482 | ||
483 | return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb); | |
484 | } | |
485 | ||
486 | /** | |
487 | * extcon_unregister_interest() - Unregister the notifier registered by | |
488 | * extcon_register_interest(). | |
489 | * @obj: the extcon_specific_cable_nb object returned by | |
490 | * extcon_register_interest(). | |
491 | */ | |
492 | int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) | |
493 | { | |
494 | if (!obj) | |
495 | return -EINVAL; | |
496 | ||
497 | return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); | |
498 | } | |
499 | ||
74c5d09b DK |
500 | /** |
501 | * extcon_register_notifier() - Register a notifee to get notified by | |
502 | * any attach status changes from the extcon. | |
503 | * @edev: the extcon device. | |
504 | * @nb: a notifier block to be registered. | |
806d9dd7 MH |
505 | * |
506 | * Note that the second parameter given to the callback of nb (val) is | |
507 | * "old_state", not the current state. The current state can be retrieved | |
508 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b DK |
509 | */ |
510 | int extcon_register_notifier(struct extcon_dev *edev, | |
511 | struct notifier_block *nb) | |
512 | { | |
513 | return raw_notifier_chain_register(&edev->nh, nb); | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
516 | ||
517 | /** | |
518 | * extcon_unregister_notifier() - Unregister a notifee from the extcon device. | |
519 | * @edev: the extcon device. | |
520 | * @nb: a registered notifier block to be unregistered. | |
521 | */ | |
522 | int extcon_unregister_notifier(struct extcon_dev *edev, | |
523 | struct notifier_block *nb) | |
524 | { | |
525 | return raw_notifier_chain_unregister(&edev->nh, nb); | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
528 | ||
de55d871 | 529 | static struct device_attribute extcon_attrs[] = { |
806d9dd7 | 530 | __ATTR(state, S_IRUGO | S_IWUSR, state_show, state_store), |
de55d871 | 531 | __ATTR_RO(name), |
806d9dd7 | 532 | __ATTR_NULL, |
de55d871 MH |
533 | }; |
534 | ||
535 | static int create_extcon_class(void) | |
536 | { | |
537 | if (!extcon_class) { | |
538 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
539 | if (IS_ERR(extcon_class)) | |
540 | return PTR_ERR(extcon_class); | |
541 | extcon_class->dev_attrs = extcon_attrs; | |
542 | ||
449a2bf5 | 543 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
544 | switch_class = class_compat_register("switch"); |
545 | if (WARN(!switch_class, "cannot allocate")) | |
546 | return -ENOMEM; | |
449a2bf5 | 547 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
548 | } |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
553 | static void extcon_cleanup(struct extcon_dev *edev, bool skip) | |
554 | { | |
74c5d09b DK |
555 | mutex_lock(&extcon_dev_list_lock); |
556 | list_del(&edev->entry); | |
557 | mutex_unlock(&extcon_dev_list_lock); | |
558 | ||
de55d871 | 559 | if (!skip && get_device(edev->dev)) { |
806d9dd7 MH |
560 | int index; |
561 | ||
bde68e60 MH |
562 | if (edev->mutually_exclusive && edev->max_supported) { |
563 | for (index = 0; edev->mutually_exclusive[index]; | |
564 | index++) | |
565 | kfree(edev->d_attrs_muex[index].attr.name); | |
566 | kfree(edev->d_attrs_muex); | |
567 | kfree(edev->attrs_muex); | |
568 | } | |
569 | ||
806d9dd7 MH |
570 | for (index = 0; index < edev->max_supported; index++) |
571 | kfree(edev->cables[index].attr_g.name); | |
572 | ||
573 | if (edev->max_supported) { | |
574 | kfree(edev->extcon_dev_type.groups); | |
575 | kfree(edev->cables); | |
576 | } | |
577 | ||
de55d871 MH |
578 | device_unregister(edev->dev); |
579 | put_device(edev->dev); | |
580 | } | |
581 | ||
582 | kfree(edev->dev); | |
583 | } | |
584 | ||
585 | static void extcon_dev_release(struct device *dev) | |
586 | { | |
587 | struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); | |
588 | ||
589 | extcon_cleanup(edev, true); | |
590 | } | |
591 | ||
bde68e60 | 592 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
593 | static void dummy_sysfs_dev_release(struct device *dev) |
594 | { | |
595 | } | |
596 | ||
de55d871 MH |
597 | /** |
598 | * extcon_dev_register() - Register a new extcon device | |
599 | * @edev : the new extcon device (should be allocated before calling) | |
600 | * @dev : the parent device for this extcon device. | |
601 | * | |
602 | * Among the members of edev struct, please set the "user initializing data" | |
603 | * in any case and set the "optional callbacks" if required. However, please | |
604 | * do not set the values of "internal data", which are initialized by | |
605 | * this function. | |
606 | */ | |
607 | int extcon_dev_register(struct extcon_dev *edev, struct device *dev) | |
608 | { | |
806d9dd7 | 609 | int ret, index = 0; |
de55d871 MH |
610 | |
611 | if (!extcon_class) { | |
612 | ret = create_extcon_class(); | |
613 | if (ret < 0) | |
614 | return ret; | |
615 | } | |
616 | ||
806d9dd7 MH |
617 | if (edev->supported_cable) { |
618 | /* Get size of array */ | |
619 | for (index = 0; edev->supported_cable[index]; index++) | |
620 | ; | |
621 | edev->max_supported = index; | |
622 | } else { | |
623 | edev->max_supported = 0; | |
624 | } | |
625 | ||
626 | if (index > SUPPORTED_CABLE_MAX) { | |
627 | dev_err(edev->dev, "extcon: maximum number of supported cables exceeded.\n"); | |
628 | return -EINVAL; | |
629 | } | |
630 | ||
de55d871 | 631 | edev->dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
a1d26ac0 DC |
632 | if (!edev->dev) |
633 | return -ENOMEM; | |
de55d871 MH |
634 | edev->dev->parent = dev; |
635 | edev->dev->class = extcon_class; | |
636 | edev->dev->release = extcon_dev_release; | |
637 | ||
638 | dev_set_name(edev->dev, edev->name ? edev->name : dev_name(dev)); | |
806d9dd7 MH |
639 | |
640 | if (edev->max_supported) { | |
641 | char buf[10]; | |
642 | char *str; | |
643 | struct extcon_cable *cable; | |
644 | ||
645 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
646 | edev->max_supported, GFP_KERNEL); | |
647 | if (!edev->cables) { | |
648 | ret = -ENOMEM; | |
649 | goto err_sysfs_alloc; | |
650 | } | |
651 | for (index = 0; index < edev->max_supported; index++) { | |
652 | cable = &edev->cables[index]; | |
653 | ||
654 | snprintf(buf, 10, "cable.%d", index); | |
655 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
656 | GFP_KERNEL); | |
657 | if (!str) { | |
658 | for (index--; index >= 0; index--) { | |
659 | cable = &edev->cables[index]; | |
660 | kfree(cable->attr_g.name); | |
661 | } | |
662 | ret = -ENOMEM; | |
663 | ||
664 | goto err_alloc_cables; | |
665 | } | |
666 | strcpy(str, buf); | |
667 | ||
668 | cable->edev = edev; | |
669 | cable->cable_index = index; | |
670 | cable->attrs[0] = &cable->attr_name.attr; | |
671 | cable->attrs[1] = &cable->attr_state.attr; | |
672 | cable->attrs[2] = NULL; | |
673 | cable->attr_g.name = str; | |
674 | cable->attr_g.attrs = cable->attrs; | |
675 | ||
676 | cable->attr_name.attr.name = "name"; | |
677 | cable->attr_name.attr.mode = 0444; | |
678 | cable->attr_name.show = cable_name_show; | |
679 | ||
680 | cable->attr_state.attr.name = "state"; | |
681 | cable->attr_state.attr.mode = 0644; | |
682 | cable->attr_state.show = cable_state_show; | |
683 | cable->attr_state.store = cable_state_store; | |
684 | } | |
685 | } | |
686 | ||
bde68e60 MH |
687 | if (edev->max_supported && edev->mutually_exclusive) { |
688 | char buf[80]; | |
689 | char *name; | |
690 | ||
691 | /* Count the size of mutually_exclusive array */ | |
692 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
693 | ; | |
694 | ||
695 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
696 | (index + 1), GFP_KERNEL); | |
697 | if (!edev->attrs_muex) { | |
698 | ret = -ENOMEM; | |
699 | goto err_muex; | |
700 | } | |
701 | ||
702 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
703 | index, GFP_KERNEL); | |
704 | if (!edev->d_attrs_muex) { | |
705 | ret = -ENOMEM; | |
706 | kfree(edev->attrs_muex); | |
707 | goto err_muex; | |
708 | } | |
709 | ||
710 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
711 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
712 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
713 | GFP_KERNEL); | |
714 | if (!name) { | |
715 | for (index--; index >= 0; index--) { | |
716 | kfree(edev->d_attrs_muex[index].attr. | |
717 | name); | |
718 | } | |
719 | kfree(edev->d_attrs_muex); | |
720 | kfree(edev->attrs_muex); | |
721 | ret = -ENOMEM; | |
722 | goto err_muex; | |
723 | } | |
724 | strcpy(name, buf); | |
725 | edev->d_attrs_muex[index].attr.name = name; | |
726 | edev->d_attrs_muex[index].attr.mode = 0000; | |
727 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
728 | .attr; | |
729 | } | |
730 | edev->attr_g_muex.name = muex_name; | |
731 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
732 | ||
733 | } | |
734 | ||
806d9dd7 MH |
735 | if (edev->max_supported) { |
736 | edev->extcon_dev_type.groups = | |
737 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 738 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
739 | if (!edev->extcon_dev_type.groups) { |
740 | ret = -ENOMEM; | |
741 | goto err_alloc_groups; | |
742 | } | |
743 | ||
744 | edev->extcon_dev_type.name = dev_name(edev->dev); | |
745 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; | |
746 | ||
747 | for (index = 0; index < edev->max_supported; index++) | |
748 | edev->extcon_dev_type.groups[index] = | |
749 | &edev->cables[index].attr_g; | |
bde68e60 MH |
750 | if (edev->mutually_exclusive) |
751 | edev->extcon_dev_type.groups[index] = | |
752 | &edev->attr_g_muex; | |
806d9dd7 MH |
753 | |
754 | edev->dev->type = &edev->extcon_dev_type; | |
755 | } | |
756 | ||
de55d871 MH |
757 | ret = device_register(edev->dev); |
758 | if (ret) { | |
759 | put_device(edev->dev); | |
760 | goto err_dev; | |
761 | } | |
449a2bf5 | 762 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
763 | if (switch_class) |
764 | ret = class_compat_create_link(switch_class, edev->dev, | |
765 | dev); | |
449a2bf5 | 766 | #endif /* CONFIG_ANDROID */ |
de55d871 | 767 | |
806d9dd7 MH |
768 | spin_lock_init(&edev->lock); |
769 | ||
74c5d09b DK |
770 | RAW_INIT_NOTIFIER_HEAD(&edev->nh); |
771 | ||
de55d871 MH |
772 | dev_set_drvdata(edev->dev, edev); |
773 | edev->state = 0; | |
74c5d09b DK |
774 | |
775 | mutex_lock(&extcon_dev_list_lock); | |
776 | list_add(&edev->entry, &extcon_dev_list); | |
777 | mutex_unlock(&extcon_dev_list_lock); | |
778 | ||
de55d871 MH |
779 | return 0; |
780 | ||
781 | err_dev: | |
806d9dd7 MH |
782 | if (edev->max_supported) |
783 | kfree(edev->extcon_dev_type.groups); | |
784 | err_alloc_groups: | |
bde68e60 MH |
785 | if (edev->max_supported && edev->mutually_exclusive) { |
786 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
787 | kfree(edev->d_attrs_muex[index].attr.name); | |
788 | kfree(edev->d_attrs_muex); | |
789 | kfree(edev->attrs_muex); | |
790 | } | |
791 | err_muex: | |
806d9dd7 MH |
792 | for (index = 0; index < edev->max_supported; index++) |
793 | kfree(edev->cables[index].attr_g.name); | |
794 | err_alloc_cables: | |
795 | if (edev->max_supported) | |
796 | kfree(edev->cables); | |
797 | err_sysfs_alloc: | |
de55d871 MH |
798 | kfree(edev->dev); |
799 | return ret; | |
800 | } | |
801 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
802 | ||
803 | /** | |
804 | * extcon_dev_unregister() - Unregister the extcon device. | |
805 | * @edev: the extcon device instance to be unregitered. | |
806 | * | |
807 | * Note that this does not call kfree(edev) because edev was not allocated | |
808 | * by this class. | |
809 | */ | |
810 | void extcon_dev_unregister(struct extcon_dev *edev) | |
811 | { | |
812 | extcon_cleanup(edev, false); | |
813 | } | |
814 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
815 | ||
816 | static int __init extcon_class_init(void) | |
817 | { | |
818 | return create_extcon_class(); | |
819 | } | |
820 | module_init(extcon_class_init); | |
821 | ||
822 | static void __exit extcon_class_exit(void) | |
823 | { | |
824 | class_destroy(extcon_class); | |
825 | } | |
826 | module_exit(extcon_class_exit); | |
827 | ||
828 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); | |
829 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
830 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
831 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
832 | MODULE_LICENSE("GPL"); |