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MyungJoo Hamde55d872012-04-20 14:16:22 +09001/*
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>
Mark Brown9baf3222012-08-16 20:03:21 +010033#include <linux/sysfs.h>
MyungJoo Hamde55d872012-04-20 14:16:22 +090034
MyungJoo Ham806d9dd2012-04-20 14:16:25 +090035/*
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 */
anish kumar0cf6ad82012-08-30 00:35:09 +053044const char extcon_cable_name[][CABLE_NAME_MAX + 1] = {
MyungJoo Ham806d9dd2012-04-20 14:16:25 +090045 [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",
Mark Brown0e1507c2012-05-02 10:38:51 +010064 [EXTCON_MECHANICAL] = "Mechanical",
MyungJoo Ham806d9dd2012-04-20 14:16:25 +090065};
66
Mark Brownbe3a07f2012-06-05 16:14:38 +010067static struct class *extcon_class;
MyungJoo Ham449a2bf2012-04-23 20:19:57 +090068#if defined(CONFIG_ANDROID)
MyungJoo Hamde55d872012-04-20 14:16:22 +090069static struct class_compat *switch_class;
MyungJoo Ham449a2bf2012-04-23 20:19:57 +090070#endif /* CONFIG_ANDROID */
MyungJoo Hamde55d872012-04-20 14:16:22 +090071
Donggeun Kim74c5d092012-04-20 14:16:24 +090072static LIST_HEAD(extcon_dev_list);
73static DEFINE_MUTEX(extcon_dev_list_lock);
74
MyungJoo Hambde68e62012-04-20 14:16:26 +090075/**
76 * check_mutually_exclusive - Check if new_state violates mutually_exclusive
Chanwoo Choia75e1c72013-08-31 13:16:49 +090077 * condition.
MyungJoo Hambde68e62012-04-20 14:16:26 +090078 * @edev: the extcon device
79 * @new_state: new cable attach status for @edev
80 *
81 * Returns 0 if nothing violates. Returns the index + 1 for the first
82 * violated condition.
83 */
84static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
85{
86 int i = 0;
87
88 if (!edev->mutually_exclusive)
89 return 0;
90
91 for (i = 0; edev->mutually_exclusive[i]; i++) {
anish kumar28c0ada2012-08-30 00:35:10 +053092 int weight;
MyungJoo Hambde68e62012-04-20 14:16:26 +090093 u32 correspondants = new_state & edev->mutually_exclusive[i];
MyungJoo Hambde68e62012-04-20 14:16:26 +090094
anish kumar28c0ada2012-08-30 00:35:10 +053095 /* calculate the total number of bits set */
96 weight = hweight32(correspondants);
97 if (weight > 1)
98 return i + 1;
MyungJoo Hambde68e62012-04-20 14:16:26 +090099 }
100
101 return 0;
102}
103
MyungJoo Hamde55d872012-04-20 14:16:22 +0900104static ssize_t state_show(struct device *dev, struct device_attribute *attr,
105 char *buf)
106{
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900107 int i, count = 0;
Jingoo Hancb8bb3a2013-09-09 14:33:32 +0900108 struct extcon_dev *edev = dev_get_drvdata(dev);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900109
110 if (edev->print_state) {
111 int ret = edev->print_state(edev, buf);
112
113 if (ret >= 0)
114 return ret;
115 /* Use default if failed */
116 }
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900117
118 if (edev->max_supported == 0)
119 return sprintf(buf, "%u\n", edev->state);
120
121 for (i = 0; i < SUPPORTED_CABLE_MAX; i++) {
122 if (!edev->supported_cable[i])
123 break;
124 count += sprintf(buf + count, "%s=%d\n",
125 edev->supported_cable[i],
126 !!(edev->state & (1 << i)));
127 }
128
129 return count;
130}
131
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900132static ssize_t state_store(struct device *dev, struct device_attribute *attr,
133 const char *buf, size_t count)
134{
135 u32 state;
136 ssize_t ret = 0;
Jingoo Hancb8bb3a2013-09-09 14:33:32 +0900137 struct extcon_dev *edev = dev_get_drvdata(dev);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900138
139 ret = sscanf(buf, "0x%x", &state);
140 if (ret == 0)
141 ret = -EINVAL;
142 else
MyungJoo Hambde68e62012-04-20 14:16:26 +0900143 ret = extcon_set_state(edev, state);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900144
145 if (ret < 0)
146 return ret;
147
148 return count;
MyungJoo Hamde55d872012-04-20 14:16:22 +0900149}
Greg Kroah-Hartmanaf01da02013-07-24 15:05:10 -0700150static DEVICE_ATTR_RW(state);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900151
152static ssize_t name_show(struct device *dev, struct device_attribute *attr,
153 char *buf)
154{
Jingoo Hancb8bb3a2013-09-09 14:33:32 +0900155 struct extcon_dev *edev = dev_get_drvdata(dev);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900156
157 /* Optional callback given by the user */
158 if (edev->print_name) {
159 int ret = edev->print_name(edev, buf);
160 if (ret >= 0)
161 return ret;
162 }
163
Chanwoo Choidae61652013-09-27 09:19:40 +0900164 return sprintf(buf, "%s\n", dev_name(&edev->dev));
MyungJoo Hamde55d872012-04-20 14:16:22 +0900165}
Greg Kroah-Hartmanaf01da02013-07-24 15:05:10 -0700166static DEVICE_ATTR_RO(name);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900167
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900168static ssize_t cable_name_show(struct device *dev,
169 struct device_attribute *attr, char *buf)
170{
171 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
172 attr_name);
173
174 return sprintf(buf, "%s\n",
175 cable->edev->supported_cable[cable->cable_index]);
176}
177
178static ssize_t cable_state_show(struct device *dev,
179 struct device_attribute *attr, char *buf)
180{
181 struct extcon_cable *cable = container_of(attr, struct extcon_cable,
182 attr_state);
183
184 return sprintf(buf, "%d\n",
185 extcon_get_cable_state_(cable->edev,
186 cable->cable_index));
187}
188
MyungJoo Hamde55d872012-04-20 14:16:22 +0900189/**
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900190 * extcon_update_state() - Update the cable attach states of the extcon device
Chanwoo Choia75e1c72013-08-31 13:16:49 +0900191 * only for the masked bits.
MyungJoo Hamde55d872012-04-20 14:16:22 +0900192 * @edev: the extcon device
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900193 * @mask: the bit mask to designate updated bits.
MyungJoo Hamde55d872012-04-20 14:16:22 +0900194 * @state: new cable attach status for @edev
195 *
196 * Changing the state sends uevent with environment variable containing
197 * the name of extcon device (envp[0]) and the state output (envp[1]).
198 * Tizen uses this format for extcon device to get events from ports.
199 * Android uses this format as well.
Donggeun Kim74c5d092012-04-20 14:16:24 +0900200 *
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900201 * Note that the notifier provides which bits are changed in the state
202 * variable with the val parameter (second) to the callback.
MyungJoo Hamde55d872012-04-20 14:16:22 +0900203 */
MyungJoo Hambde68e62012-04-20 14:16:26 +0900204int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state)
MyungJoo Hamde55d872012-04-20 14:16:22 +0900205{
206 char name_buf[120];
207 char state_buf[120];
208 char *prop_buf;
209 char *envp[3];
210 int env_offset = 0;
211 int length;
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900212 unsigned long flags;
MyungJoo Hamde55d872012-04-20 14:16:22 +0900213
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900214 spin_lock_irqsave(&edev->lock, flags);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900215
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900216 if (edev->state != ((edev->state & ~mask) | (state & mask))) {
217 u32 old_state = edev->state;
Donggeun Kim74c5d092012-04-20 14:16:24 +0900218
MyungJoo Hambde68e62012-04-20 14:16:26 +0900219 if (check_mutually_exclusive(edev, (edev->state & ~mask) |
220 (state & mask))) {
221 spin_unlock_irqrestore(&edev->lock, flags);
222 return -EPERM;
223 }
224
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900225 edev->state &= ~mask;
226 edev->state |= state & mask;
227
228 raw_notifier_call_chain(&edev->nh, old_state, edev);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900229 /* This could be in interrupt handler */
230 prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900231 if (prop_buf) {
Chanwoo Choidae61652013-09-27 09:19:40 +0900232 length = name_show(&edev->dev, NULL, prop_buf);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900233 if (length > 0) {
234 if (prop_buf[length - 1] == '\n')
235 prop_buf[length - 1] = 0;
236 snprintf(name_buf, sizeof(name_buf),
237 "NAME=%s", prop_buf);
238 envp[env_offset++] = name_buf;
239 }
Chanwoo Choidae61652013-09-27 09:19:40 +0900240 length = state_show(&edev->dev, NULL, prop_buf);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900241 if (length > 0) {
242 if (prop_buf[length - 1] == '\n')
243 prop_buf[length - 1] = 0;
244 snprintf(state_buf, sizeof(state_buf),
245 "STATE=%s", prop_buf);
246 envp[env_offset++] = state_buf;
247 }
248 envp[env_offset] = NULL;
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900249 /* Unlock early before uevent */
250 spin_unlock_irqrestore(&edev->lock, flags);
251
Chanwoo Choidae61652013-09-27 09:19:40 +0900252 kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900253 free_page((unsigned long)prop_buf);
254 } else {
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900255 /* Unlock early before uevent */
256 spin_unlock_irqrestore(&edev->lock, flags);
257
Chanwoo Choidae61652013-09-27 09:19:40 +0900258 dev_err(&edev->dev, "out of memory in extcon_set_state\n");
259 kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900260 }
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900261 } else {
262 /* No changes */
263 spin_unlock_irqrestore(&edev->lock, flags);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900264 }
MyungJoo Hambde68e62012-04-20 14:16:26 +0900265
266 return 0;
MyungJoo Hamde55d872012-04-20 14:16:22 +0900267}
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900268EXPORT_SYMBOL_GPL(extcon_update_state);
269
270/**
271 * extcon_set_state() - Set the cable attach states of the extcon device.
272 * @edev: the extcon device
273 * @state: new cable attach status for @edev
274 *
275 * Note that notifier provides which bits are changed in the state
276 * variable with the val parameter (second) to the callback.
277 */
MyungJoo Hambde68e62012-04-20 14:16:26 +0900278int extcon_set_state(struct extcon_dev *edev, u32 state)
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900279{
MyungJoo Hambde68e62012-04-20 14:16:26 +0900280 return extcon_update_state(edev, 0xffffffff, state);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900281}
MyungJoo Hamde55d872012-04-20 14:16:22 +0900282EXPORT_SYMBOL_GPL(extcon_set_state);
283
Donggeun Kim74c5d092012-04-20 14:16:24 +0900284/**
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900285 * extcon_find_cable_index() - Get the cable index based on the cable name.
286 * @edev: the extcon device that has the cable.
287 * @cable_name: cable name to be searched.
288 *
289 * Note that accessing a cable state based on cable_index is faster than
290 * cable_name because using cable_name induces a loop with strncmp().
291 * Thus, when get/set_cable_state is repeatedly used, using cable_index
292 * is recommended.
293 */
294int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name)
295{
296 int i;
297
298 if (edev->supported_cable) {
299 for (i = 0; edev->supported_cable[i]; i++) {
300 if (!strncmp(edev->supported_cable[i],
301 cable_name, CABLE_NAME_MAX))
302 return i;
303 }
304 }
305
306 return -EINVAL;
307}
308EXPORT_SYMBOL_GPL(extcon_find_cable_index);
309
310/**
311 * extcon_get_cable_state_() - Get the status of a specific cable.
312 * @edev: the extcon device that has the cable.
313 * @index: cable index that can be retrieved by extcon_find_cable_index().
314 */
315int extcon_get_cable_state_(struct extcon_dev *edev, int index)
316{
317 if (index < 0 || (edev->max_supported && edev->max_supported <= index))
318 return -EINVAL;
319
320 return !!(edev->state & (1 << index));
321}
322EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
323
324/**
325 * extcon_get_cable_state() - Get the status of a specific cable.
326 * @edev: the extcon device that has the cable.
327 * @cable_name: cable name.
328 *
329 * Note that this is slower than extcon_get_cable_state_.
330 */
331int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
332{
333 return extcon_get_cable_state_(edev, extcon_find_cable_index
334 (edev, cable_name));
335}
336EXPORT_SYMBOL_GPL(extcon_get_cable_state);
337
338/**
Axel Lin909f9ec2012-10-04 09:53:45 +0900339 * extcon_set_cable_state_() - Set the status of a specific cable.
Chanwoo Choia75e1c72013-08-31 13:16:49 +0900340 * @edev: the extcon device that has the cable.
341 * @index: cable index that can be retrieved by
342 * extcon_find_cable_index().
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900343 * @cable_state: the new cable status. The default semantics is
344 * true: attached / false: detached.
345 */
346int extcon_set_cable_state_(struct extcon_dev *edev,
347 int index, bool cable_state)
348{
349 u32 state;
350
351 if (index < 0 || (edev->max_supported && edev->max_supported <= index))
352 return -EINVAL;
353
354 state = cable_state ? (1 << index) : 0;
MyungJoo Hambde68e62012-04-20 14:16:26 +0900355 return extcon_update_state(edev, 1 << index, state);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900356}
357EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
358
359/**
Axel Lin909f9ec2012-10-04 09:53:45 +0900360 * extcon_set_cable_state() - Set the status of a specific cable.
Chanwoo Choia75e1c72013-08-31 13:16:49 +0900361 * @edev: the extcon device that has the cable.
362 * @cable_name: cable name.
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900363 * @cable_state: the new cable status. The default semantics is
364 * true: attached / false: detached.
365 *
366 * Note that this is slower than extcon_set_cable_state_.
367 */
368int extcon_set_cable_state(struct extcon_dev *edev,
369 const char *cable_name, bool cable_state)
370{
371 return extcon_set_cable_state_(edev, extcon_find_cable_index
372 (edev, cable_name), cable_state);
373}
374EXPORT_SYMBOL_GPL(extcon_set_cable_state);
375
376/**
Donggeun Kim74c5d092012-04-20 14:16:24 +0900377 * extcon_get_extcon_dev() - Get the extcon device instance from the name
378 * @extcon_name: The extcon name provided with extcon_dev_register()
379 */
380struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
381{
382 struct extcon_dev *sd;
383
384 mutex_lock(&extcon_dev_list_lock);
385 list_for_each_entry(sd, &extcon_dev_list, entry) {
386 if (!strcmp(sd->name, extcon_name))
387 goto out;
388 }
389 sd = NULL;
390out:
391 mutex_unlock(&extcon_dev_list_lock);
392 return sd;
393}
394EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
395
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900396static int _call_per_cable(struct notifier_block *nb, unsigned long val,
397 void *ptr)
398{
399 struct extcon_specific_cable_nb *obj = container_of(nb,
400 struct extcon_specific_cable_nb, internal_nb);
401 struct extcon_dev *edev = ptr;
402
403 if ((val & (1 << obj->cable_index)) !=
404 (edev->state & (1 << obj->cable_index))) {
Chanwoo Choif4cce692012-04-27 15:17:28 +0900405 bool cable_state = true;
406
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900407 obj->previous_value = val;
Chanwoo Choif4cce692012-04-27 15:17:28 +0900408
409 if (val & (1 << obj->cable_index))
410 cable_state = false;
411
412 return obj->user_nb->notifier_call(obj->user_nb,
413 cable_state, ptr);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900414 }
415
416 return NOTIFY_OK;
417}
418
419/**
420 * extcon_register_interest() - Register a notifier for a state change of a
Chanwoo Choia75e1c72013-08-31 13:16:49 +0900421 * specific cable, not an entier set of cables of a
422 * extcon device.
423 * @obj: an empty extcon_specific_cable_nb object to be returned.
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900424 * @extcon_name: the name of extcon device.
Jenny TC4f2de3b2012-10-18 21:00:32 +0900425 * if NULL, extcon_register_interest will register
426 * every cable with the target cable_name given.
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900427 * @cable_name: the target cable name.
Chanwoo Choia75e1c72013-08-31 13:16:49 +0900428 * @nb: the notifier block to get notified.
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900429 *
430 * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets
431 * the struct for you.
432 *
433 * extcon_register_interest is a helper function for those who want to get
434 * notification for a single specific cable's status change. If a user wants
435 * to get notification for any changes of all cables of a extcon device,
436 * he/she should use the general extcon_register_notifier().
437 *
438 * Note that the second parameter given to the callback of nb (val) is
439 * "old_state", not the current state. The current state can be retrieved
440 * by looking at the third pameter (edev pointer)'s state value.
441 */
442int extcon_register_interest(struct extcon_specific_cable_nb *obj,
443 const char *extcon_name, const char *cable_name,
444 struct notifier_block *nb)
445{
Jenny TC4f2de3b2012-10-18 21:00:32 +0900446 if (!obj || !cable_name || !nb)
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900447 return -EINVAL;
448
Jenny TC4f2de3b2012-10-18 21:00:32 +0900449 if (extcon_name) {
450 obj->edev = extcon_get_extcon_dev(extcon_name);
451 if (!obj->edev)
452 return -ENODEV;
453
Chanwoo Choic2275d22013-08-23 10:21:37 +0900454 obj->cable_index = extcon_find_cable_index(obj->edev,
455 cable_name);
Jenny TC4f2de3b2012-10-18 21:00:32 +0900456 if (obj->cable_index < 0)
Sachin Kamatc0c078c2012-11-20 16:30:31 +0900457 return obj->cable_index;
Jenny TC4f2de3b2012-10-18 21:00:32 +0900458
459 obj->user_nb = nb;
460
461 obj->internal_nb.notifier_call = _call_per_cable;
462
Chanwoo Choic2275d22013-08-23 10:21:37 +0900463 return raw_notifier_chain_register(&obj->edev->nh,
464 &obj->internal_nb);
Jenny TC4f2de3b2012-10-18 21:00:32 +0900465 } else {
466 struct class_dev_iter iter;
467 struct extcon_dev *extd;
468 struct device *dev;
469
470 if (!extcon_class)
471 return -ENODEV;
472 class_dev_iter_init(&iter, extcon_class, NULL, NULL);
473 while ((dev = class_dev_iter_next(&iter))) {
Jingoo Hancb8bb3a2013-09-09 14:33:32 +0900474 extd = dev_get_drvdata(dev);
Jenny TC4f2de3b2012-10-18 21:00:32 +0900475
476 if (extcon_find_cable_index(extd, cable_name) < 0)
477 continue;
478
479 class_dev_iter_exit(&iter);
480 return extcon_register_interest(obj, extd->name,
481 cable_name, nb);
482 }
483
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900484 return -ENODEV;
Jenny TC4f2de3b2012-10-18 21:00:32 +0900485 }
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900486}
Kishon Vijay Abraham I9c8a0132013-06-04 01:13:38 +0900487EXPORT_SYMBOL_GPL(extcon_register_interest);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900488
489/**
490 * extcon_unregister_interest() - Unregister the notifier registered by
Chanwoo Choia75e1c72013-08-31 13:16:49 +0900491 * extcon_register_interest().
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900492 * @obj: the extcon_specific_cable_nb object returned by
493 * extcon_register_interest().
494 */
495int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
496{
497 if (!obj)
498 return -EINVAL;
499
500 return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
501}
Kishon Vijay Abraham I9c8a0132013-06-04 01:13:38 +0900502EXPORT_SYMBOL_GPL(extcon_unregister_interest);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900503
Donggeun Kim74c5d092012-04-20 14:16:24 +0900504/**
Peter Meerwaldc338bb02012-08-23 09:11:54 +0900505 * extcon_register_notifier() - Register a notifiee to get notified by
Chanwoo Choia75e1c72013-08-31 13:16:49 +0900506 * any attach status changes from the extcon.
Donggeun Kim74c5d092012-04-20 14:16:24 +0900507 * @edev: the extcon device.
508 * @nb: a notifier block to be registered.
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900509 *
510 * Note that the second parameter given to the callback of nb (val) is
511 * "old_state", not the current state. The current state can be retrieved
512 * by looking at the third pameter (edev pointer)'s state value.
Donggeun Kim74c5d092012-04-20 14:16:24 +0900513 */
514int extcon_register_notifier(struct extcon_dev *edev,
515 struct notifier_block *nb)
516{
517 return raw_notifier_chain_register(&edev->nh, nb);
518}
519EXPORT_SYMBOL_GPL(extcon_register_notifier);
520
521/**
Peter Meerwaldc338bb02012-08-23 09:11:54 +0900522 * extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
Donggeun Kim74c5d092012-04-20 14:16:24 +0900523 * @edev: the extcon device.
524 * @nb: a registered notifier block to be unregistered.
525 */
526int extcon_unregister_notifier(struct extcon_dev *edev,
527 struct notifier_block *nb)
528{
529 return raw_notifier_chain_unregister(&edev->nh, nb);
530}
531EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
532
Greg Kroah-Hartmanaf01da02013-07-24 15:05:10 -0700533static struct attribute *extcon_attrs[] = {
534 &dev_attr_state.attr,
535 &dev_attr_name.attr,
536 NULL,
MyungJoo Hamde55d872012-04-20 14:16:22 +0900537};
Greg Kroah-Hartmanaf01da02013-07-24 15:05:10 -0700538ATTRIBUTE_GROUPS(extcon);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900539
540static int create_extcon_class(void)
541{
542 if (!extcon_class) {
543 extcon_class = class_create(THIS_MODULE, "extcon");
544 if (IS_ERR(extcon_class))
545 return PTR_ERR(extcon_class);
Greg Kroah-Hartmanaf01da02013-07-24 15:05:10 -0700546 extcon_class->dev_groups = extcon_groups;
MyungJoo Hamde55d872012-04-20 14:16:22 +0900547
MyungJoo Ham449a2bf2012-04-23 20:19:57 +0900548#if defined(CONFIG_ANDROID)
MyungJoo Hamde55d872012-04-20 14:16:22 +0900549 switch_class = class_compat_register("switch");
550 if (WARN(!switch_class, "cannot allocate"))
551 return -ENOMEM;
MyungJoo Ham449a2bf2012-04-23 20:19:57 +0900552#endif /* CONFIG_ANDROID */
MyungJoo Hamde55d872012-04-20 14:16:22 +0900553 }
554
555 return 0;
556}
557
MyungJoo Hamde55d872012-04-20 14:16:22 +0900558static void extcon_dev_release(struct device *dev)
559{
MyungJoo Hamde55d872012-04-20 14:16:22 +0900560}
561
MyungJoo Hambde68e62012-04-20 14:16:26 +0900562static const char *muex_name = "mutually_exclusive";
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900563static void dummy_sysfs_dev_release(struct device *dev)
564{
565}
566
MyungJoo Hamde55d872012-04-20 14:16:22 +0900567/**
568 * extcon_dev_register() - Register a new extcon device
569 * @edev : the new extcon device (should be allocated before calling)
MyungJoo Hamde55d872012-04-20 14:16:22 +0900570 *
571 * Among the members of edev struct, please set the "user initializing data"
572 * in any case and set the "optional callbacks" if required. However, please
573 * do not set the values of "internal data", which are initialized by
574 * this function.
575 */
Chanwoo Choi42d7d752013-09-27 09:20:26 +0900576int extcon_dev_register(struct extcon_dev *edev)
MyungJoo Hamde55d872012-04-20 14:16:22 +0900577{
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900578 int ret, index = 0;
MyungJoo Hamde55d872012-04-20 14:16:22 +0900579
580 if (!extcon_class) {
581 ret = create_extcon_class();
582 if (ret < 0)
583 return ret;
584 }
585
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900586 if (edev->supported_cable) {
587 /* Get size of array */
588 for (index = 0; edev->supported_cable[index]; index++)
589 ;
590 edev->max_supported = index;
591 } else {
592 edev->max_supported = 0;
593 }
594
595 if (index > SUPPORTED_CABLE_MAX) {
Chanwoo Choidae61652013-09-27 09:19:40 +0900596 dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\n");
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900597 return -EINVAL;
598 }
599
Chanwoo Choidae61652013-09-27 09:19:40 +0900600 edev->dev.class = extcon_class;
601 edev->dev.release = extcon_dev_release;
MyungJoo Hamde55d872012-04-20 14:16:22 +0900602
Chanwoo Choi42d7d752013-09-27 09:20:26 +0900603 edev->name = edev->name ? edev->name : dev_name(edev->dev.parent);
604 if (IS_ERR_OR_NULL(edev->name)) {
605 dev_err(&edev->dev,
606 "extcon device name is null\n");
607 return -EINVAL;
608 }
Chanwoo Choidae61652013-09-27 09:19:40 +0900609 dev_set_name(&edev->dev, "%s", edev->name);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900610
611 if (edev->max_supported) {
612 char buf[10];
613 char *str;
614 struct extcon_cable *cable;
615
616 edev->cables = kzalloc(sizeof(struct extcon_cable) *
617 edev->max_supported, GFP_KERNEL);
618 if (!edev->cables) {
619 ret = -ENOMEM;
620 goto err_sysfs_alloc;
621 }
622 for (index = 0; index < edev->max_supported; index++) {
623 cable = &edev->cables[index];
624
625 snprintf(buf, 10, "cable.%d", index);
626 str = kzalloc(sizeof(char) * (strlen(buf) + 1),
627 GFP_KERNEL);
628 if (!str) {
629 for (index--; index >= 0; index--) {
630 cable = &edev->cables[index];
631 kfree(cable->attr_g.name);
632 }
633 ret = -ENOMEM;
634
635 goto err_alloc_cables;
636 }
637 strcpy(str, buf);
638
639 cable->edev = edev;
640 cable->cable_index = index;
641 cable->attrs[0] = &cable->attr_name.attr;
642 cable->attrs[1] = &cable->attr_state.attr;
643 cable->attrs[2] = NULL;
644 cable->attr_g.name = str;
645 cable->attr_g.attrs = cable->attrs;
646
Mark Brown9baf3222012-08-16 20:03:21 +0100647 sysfs_attr_init(&cable->attr_name.attr);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900648 cable->attr_name.attr.name = "name";
649 cable->attr_name.attr.mode = 0444;
650 cable->attr_name.show = cable_name_show;
651
Mark Brown9baf3222012-08-16 20:03:21 +0100652 sysfs_attr_init(&cable->attr_state.attr);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900653 cable->attr_state.attr.name = "state";
Chanwoo Choiea9dd9d2013-05-22 19:31:59 +0900654 cable->attr_state.attr.mode = 0444;
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900655 cable->attr_state.show = cable_state_show;
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900656 }
657 }
658
MyungJoo Hambde68e62012-04-20 14:16:26 +0900659 if (edev->max_supported && edev->mutually_exclusive) {
660 char buf[80];
661 char *name;
662
663 /* Count the size of mutually_exclusive array */
664 for (index = 0; edev->mutually_exclusive[index]; index++)
665 ;
666
667 edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
668 (index + 1), GFP_KERNEL);
669 if (!edev->attrs_muex) {
670 ret = -ENOMEM;
671 goto err_muex;
672 }
673
674 edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
675 index, GFP_KERNEL);
676 if (!edev->d_attrs_muex) {
677 ret = -ENOMEM;
678 kfree(edev->attrs_muex);
679 goto err_muex;
680 }
681
682 for (index = 0; edev->mutually_exclusive[index]; index++) {
683 sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
684 name = kzalloc(sizeof(char) * (strlen(buf) + 1),
685 GFP_KERNEL);
686 if (!name) {
687 for (index--; index >= 0; index--) {
688 kfree(edev->d_attrs_muex[index].attr.
689 name);
690 }
691 kfree(edev->d_attrs_muex);
692 kfree(edev->attrs_muex);
693 ret = -ENOMEM;
694 goto err_muex;
695 }
696 strcpy(name, buf);
Mark Brown9baf3222012-08-16 20:03:21 +0100697 sysfs_attr_init(&edev->d_attrs_muex[index].attr);
MyungJoo Hambde68e62012-04-20 14:16:26 +0900698 edev->d_attrs_muex[index].attr.name = name;
699 edev->d_attrs_muex[index].attr.mode = 0000;
700 edev->attrs_muex[index] = &edev->d_attrs_muex[index]
701 .attr;
702 }
703 edev->attr_g_muex.name = muex_name;
704 edev->attr_g_muex.attrs = edev->attrs_muex;
705
706 }
707
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900708 if (edev->max_supported) {
709 edev->extcon_dev_type.groups =
710 kzalloc(sizeof(struct attribute_group *) *
MyungJoo Hambde68e62012-04-20 14:16:26 +0900711 (edev->max_supported + 2), GFP_KERNEL);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900712 if (!edev->extcon_dev_type.groups) {
713 ret = -ENOMEM;
714 goto err_alloc_groups;
715 }
716
Chanwoo Choidae61652013-09-27 09:19:40 +0900717 edev->extcon_dev_type.name = dev_name(&edev->dev);
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900718 edev->extcon_dev_type.release = dummy_sysfs_dev_release;
719
720 for (index = 0; index < edev->max_supported; index++)
721 edev->extcon_dev_type.groups[index] =
722 &edev->cables[index].attr_g;
MyungJoo Hambde68e62012-04-20 14:16:26 +0900723 if (edev->mutually_exclusive)
724 edev->extcon_dev_type.groups[index] =
725 &edev->attr_g_muex;
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900726
Chanwoo Choidae61652013-09-27 09:19:40 +0900727 edev->dev.type = &edev->extcon_dev_type;
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900728 }
729
Chanwoo Choidae61652013-09-27 09:19:40 +0900730 ret = device_register(&edev->dev);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900731 if (ret) {
Chanwoo Choidae61652013-09-27 09:19:40 +0900732 put_device(&edev->dev);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900733 goto err_dev;
734 }
MyungJoo Ham449a2bf2012-04-23 20:19:57 +0900735#if defined(CONFIG_ANDROID)
MyungJoo Hamde55d872012-04-20 14:16:22 +0900736 if (switch_class)
Chanwoo Choidae61652013-09-27 09:19:40 +0900737 ret = class_compat_create_link(switch_class, &edev->dev, NULL);
MyungJoo Ham449a2bf2012-04-23 20:19:57 +0900738#endif /* CONFIG_ANDROID */
MyungJoo Hamde55d872012-04-20 14:16:22 +0900739
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900740 spin_lock_init(&edev->lock);
741
Donggeun Kim74c5d092012-04-20 14:16:24 +0900742 RAW_INIT_NOTIFIER_HEAD(&edev->nh);
743
Chanwoo Choidae61652013-09-27 09:19:40 +0900744 dev_set_drvdata(&edev->dev, edev);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900745 edev->state = 0;
Donggeun Kim74c5d092012-04-20 14:16:24 +0900746
747 mutex_lock(&extcon_dev_list_lock);
748 list_add(&edev->entry, &extcon_dev_list);
749 mutex_unlock(&extcon_dev_list_lock);
750
MyungJoo Hamde55d872012-04-20 14:16:22 +0900751 return 0;
752
753err_dev:
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900754 if (edev->max_supported)
755 kfree(edev->extcon_dev_type.groups);
756err_alloc_groups:
MyungJoo Hambde68e62012-04-20 14:16:26 +0900757 if (edev->max_supported && edev->mutually_exclusive) {
758 for (index = 0; edev->mutually_exclusive[index]; index++)
759 kfree(edev->d_attrs_muex[index].attr.name);
760 kfree(edev->d_attrs_muex);
761 kfree(edev->attrs_muex);
762 }
763err_muex:
MyungJoo Ham806d9dd2012-04-20 14:16:25 +0900764 for (index = 0; index < edev->max_supported; index++)
765 kfree(edev->cables[index].attr_g.name);
766err_alloc_cables:
767 if (edev->max_supported)
768 kfree(edev->cables);
769err_sysfs_alloc:
MyungJoo Hamde55d872012-04-20 14:16:22 +0900770 return ret;
771}
772EXPORT_SYMBOL_GPL(extcon_dev_register);
773
774/**
775 * extcon_dev_unregister() - Unregister the extcon device.
Peter Meerwaldc338bb02012-08-23 09:11:54 +0900776 * @edev: the extcon device instance to be unregistered.
MyungJoo Hamde55d872012-04-20 14:16:22 +0900777 *
778 * Note that this does not call kfree(edev) because edev was not allocated
779 * by this class.
780 */
781void extcon_dev_unregister(struct extcon_dev *edev)
782{
anish kumar57e7cd32012-10-22 09:43:33 +0900783 int index;
784
785 mutex_lock(&extcon_dev_list_lock);
786 list_del(&edev->entry);
787 mutex_unlock(&extcon_dev_list_lock);
788
Chanwoo Choidae61652013-09-27 09:19:40 +0900789 if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
790 dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
791 dev_name(&edev->dev));
anish kumar57e7cd32012-10-22 09:43:33 +0900792 return;
793 }
794
795 if (edev->mutually_exclusive && edev->max_supported) {
796 for (index = 0; edev->mutually_exclusive[index];
797 index++)
798 kfree(edev->d_attrs_muex[index].attr.name);
799 kfree(edev->d_attrs_muex);
800 kfree(edev->attrs_muex);
801 }
802
803 for (index = 0; index < edev->max_supported; index++)
804 kfree(edev->cables[index].attr_g.name);
805
806 if (edev->max_supported) {
807 kfree(edev->extcon_dev_type.groups);
808 kfree(edev->cables);
809 }
810
811#if defined(CONFIG_ANDROID)
812 if (switch_class)
Chanwoo Choidae61652013-09-27 09:19:40 +0900813 class_compat_remove_link(switch_class, &edev->dev, NULL);
anish kumar57e7cd32012-10-22 09:43:33 +0900814#endif
Chanwoo Choidae61652013-09-27 09:19:40 +0900815 device_unregister(&edev->dev);
816 put_device(&edev->dev);
MyungJoo Hamde55d872012-04-20 14:16:22 +0900817}
818EXPORT_SYMBOL_GPL(extcon_dev_unregister);
819
820static int __init extcon_class_init(void)
821{
822 return create_extcon_class();
823}
824module_init(extcon_class_init);
825
826static void __exit extcon_class_exit(void)
827{
Peter Huewe0dc77b62012-09-24 15:32:31 +0900828#if defined(CONFIG_ANDROID)
829 class_compat_unregister(switch_class);
830#endif
MyungJoo Hamde55d872012-04-20 14:16:22 +0900831 class_destroy(extcon_class);
832}
833module_exit(extcon_class_exit);
834
835MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
836MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
837MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
838MODULE_DESCRIPTION("External connector (extcon) class driver");
839MODULE_LICENSE("GPL");