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