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Commit | Line | Data |
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de55d871 | 1 | /* |
b9ec23c0 | 2 | * drivers/extcon/extcon.c - External Connector (extcon) framework. |
de55d871 MH |
3 | * |
4 | * External connector (extcon) class driver | |
5 | * | |
2a9de9c0 CC |
6 | * Copyright (C) 2015 Samsung Electronics |
7 | * Author: Chanwoo Choi <cw00.choi@samsung.com> | |
8 | * | |
de55d871 MH |
9 | * Copyright (C) 2012 Samsung Electronics |
10 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
11 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
12 | * | |
13 | * based on android/drivers/switch/switch_class.c | |
14 | * Copyright (C) 2008 Google, Inc. | |
15 | * Author: Mike Lockwood <lockwood@android.com> | |
16 | * | |
17 | * This software is licensed under the terms of the GNU General Public | |
18 | * License version 2, as published by the Free Software Foundation, and | |
19 | * may be copied, distributed, and modified under those terms. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
b9ec23c0 | 25 | */ |
de55d871 MH |
26 | |
27 | #include <linux/module.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/fs.h> | |
32 | #include <linux/err.h> | |
33 | #include <linux/extcon.h> | |
f841afb1 | 34 | #include <linux/of.h> |
de55d871 | 35 | #include <linux/slab.h> |
9baf3220 | 36 | #include <linux/sysfs.h> |
de55d871 | 37 | |
2a9de9c0 CC |
38 | #define SUPPORTED_CABLE_MAX 32 |
39 | #define CABLE_NAME_MAX 30 | |
40 | ||
55e4e2f1 CC |
41 | struct __extcon_info { |
42 | unsigned int type; | |
43 | unsigned int id; | |
44 | const char *name; | |
45 | ||
46 | } extcon_info[] = { | |
47 | [EXTCON_NONE] = { | |
48 | .type = EXTCON_TYPE_MISC, | |
49 | .id = EXTCON_NONE, | |
50 | .name = "NONE", | |
51 | }, | |
73b6ecdb | 52 | |
8e9bc36d | 53 | /* USB external connector */ |
55e4e2f1 CC |
54 | [EXTCON_USB] = { |
55 | .type = EXTCON_TYPE_USB, | |
56 | .id = EXTCON_USB, | |
57 | .name = "USB", | |
58 | }, | |
59 | [EXTCON_USB_HOST] = { | |
60 | .type = EXTCON_TYPE_USB, | |
61 | .id = EXTCON_USB_HOST, | |
62 | .name = "USB_HOST", | |
63 | }, | |
8e9bc36d | 64 | |
11eecf91 | 65 | /* Charging external connector */ |
55e4e2f1 CC |
66 | [EXTCON_CHG_USB_SDP] = { |
67 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
68 | .id = EXTCON_CHG_USB_SDP, | |
69 | .name = "SDP", | |
70 | }, | |
71 | [EXTCON_CHG_USB_DCP] = { | |
72 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
73 | .id = EXTCON_CHG_USB_DCP, | |
74 | .name = "DCP", | |
75 | }, | |
76 | [EXTCON_CHG_USB_CDP] = { | |
77 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
78 | .id = EXTCON_CHG_USB_CDP, | |
79 | .name = "CDP", | |
80 | }, | |
81 | [EXTCON_CHG_USB_ACA] = { | |
82 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
83 | .id = EXTCON_CHG_USB_ACA, | |
84 | .name = "ACA", | |
85 | }, | |
86 | [EXTCON_CHG_USB_FAST] = { | |
87 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
88 | .id = EXTCON_CHG_USB_FAST, | |
89 | .name = "FAST-CHARGER", | |
90 | }, | |
91 | [EXTCON_CHG_USB_SLOW] = { | |
92 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
93 | .id = EXTCON_CHG_USB_SLOW, | |
94 | .name = "SLOW-CHARGER", | |
95 | }, | |
8e9bc36d | 96 | |
11eecf91 | 97 | /* Jack external connector */ |
55e4e2f1 CC |
98 | [EXTCON_JACK_MICROPHONE] = { |
99 | .type = EXTCON_TYPE_JACK, | |
100 | .id = EXTCON_JACK_MICROPHONE, | |
101 | .name = "MICROPHONE", | |
102 | }, | |
103 | [EXTCON_JACK_HEADPHONE] = { | |
104 | .type = EXTCON_TYPE_JACK, | |
105 | .id = EXTCON_JACK_HEADPHONE, | |
106 | .name = "HEADPHONE", | |
107 | }, | |
108 | [EXTCON_JACK_LINE_IN] = { | |
109 | .type = EXTCON_TYPE_JACK, | |
110 | .id = EXTCON_JACK_LINE_IN, | |
111 | .name = "LINE-IN", | |
112 | }, | |
113 | [EXTCON_JACK_LINE_OUT] = { | |
114 | .type = EXTCON_TYPE_JACK, | |
115 | .id = EXTCON_JACK_LINE_OUT, | |
116 | .name = "LINE-OUT", | |
117 | }, | |
118 | [EXTCON_JACK_VIDEO_IN] = { | |
119 | .type = EXTCON_TYPE_JACK, | |
120 | .id = EXTCON_JACK_VIDEO_IN, | |
121 | .name = "VIDEO-IN", | |
122 | }, | |
123 | [EXTCON_JACK_VIDEO_OUT] = { | |
124 | .type = EXTCON_TYPE_JACK, | |
125 | .id = EXTCON_JACK_VIDEO_OUT, | |
126 | .name = "VIDEO-OUT", | |
127 | }, | |
128 | [EXTCON_JACK_SPDIF_IN] = { | |
129 | .type = EXTCON_TYPE_JACK, | |
130 | .id = EXTCON_JACK_SPDIF_IN, | |
131 | .name = "SPDIF-IN", | |
132 | }, | |
133 | [EXTCON_JACK_SPDIF_OUT] = { | |
134 | .type = EXTCON_TYPE_JACK, | |
135 | .id = EXTCON_JACK_SPDIF_OUT, | |
136 | .name = "SPDIF-OUT", | |
137 | }, | |
8e9bc36d | 138 | |
11eecf91 | 139 | /* Display external connector */ |
55e4e2f1 CC |
140 | [EXTCON_DISP_HDMI] = { |
141 | .type = EXTCON_TYPE_DISP, | |
142 | .id = EXTCON_DISP_HDMI, | |
143 | .name = "HDMI", | |
144 | }, | |
145 | [EXTCON_DISP_MHL] = { | |
146 | .type = EXTCON_TYPE_DISP, | |
147 | .id = EXTCON_DISP_MHL, | |
148 | .name = "MHL", | |
149 | }, | |
150 | [EXTCON_DISP_DVI] = { | |
151 | .type = EXTCON_TYPE_DISP, | |
152 | .id = EXTCON_DISP_DVI, | |
153 | .name = "DVI", | |
154 | }, | |
155 | [EXTCON_DISP_VGA] = { | |
156 | .type = EXTCON_TYPE_DISP, | |
157 | .id = EXTCON_DISP_VGA, | |
158 | .name = "VGA", | |
159 | }, | |
2164188d CZ |
160 | [EXTCON_DISP_DP] = { |
161 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
162 | .id = EXTCON_DISP_DP, | |
163 | .name = "DP", | |
164 | }, | |
8e9bc36d | 165 | |
11eecf91 | 166 | /* Miscellaneous external connector */ |
55e4e2f1 CC |
167 | [EXTCON_DOCK] = { |
168 | .type = EXTCON_TYPE_MISC, | |
169 | .id = EXTCON_DOCK, | |
170 | .name = "DOCK", | |
171 | }, | |
172 | [EXTCON_JIG] = { | |
173 | .type = EXTCON_TYPE_MISC, | |
174 | .id = EXTCON_JIG, | |
175 | .name = "JIG", | |
176 | }, | |
177 | [EXTCON_MECHANICAL] = { | |
178 | .type = EXTCON_TYPE_MISC, | |
179 | .id = EXTCON_MECHANICAL, | |
180 | .name = "MECHANICAL", | |
181 | }, | |
182 | ||
183 | { /* sentinel */ } | |
806d9dd7 MH |
184 | }; |
185 | ||
20f7b53d CC |
186 | /** |
187 | * struct extcon_cable - An internal data for each cable of extcon device. | |
188 | * @edev: The extcon device | |
189 | * @cable_index: Index of this cable in the edev | |
190 | * @attr_g: Attribute group for the cable | |
191 | * @attr_name: "name" sysfs entry | |
192 | * @attr_state: "state" sysfs entry | |
193 | * @attrs: Array pointing to attr_name and attr_state for attr_g | |
194 | */ | |
195 | struct extcon_cable { | |
196 | struct extcon_dev *edev; | |
197 | int cable_index; | |
198 | ||
199 | struct attribute_group attr_g; | |
200 | struct device_attribute attr_name; | |
201 | struct device_attribute attr_state; | |
202 | ||
203 | struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ | |
792e7e9e CC |
204 | |
205 | union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT]; | |
206 | union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT]; | |
207 | union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT]; | |
208 | union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT]; | |
7f2a0a16 CC |
209 | |
210 | unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)]; | |
211 | unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)]; | |
212 | unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)]; | |
213 | unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)]; | |
20f7b53d CC |
214 | }; |
215 | ||
be3a07f7 | 216 | static struct class *extcon_class; |
449a2bf5 | 217 | #if defined(CONFIG_ANDROID) |
de55d871 | 218 | static struct class_compat *switch_class; |
449a2bf5 | 219 | #endif /* CONFIG_ANDROID */ |
de55d871 | 220 | |
74c5d09b DK |
221 | static LIST_HEAD(extcon_dev_list); |
222 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
223 | ||
bde68e60 MH |
224 | /** |
225 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
a75e1c73 | 226 | * condition. |
bde68e60 MH |
227 | * @edev: the extcon device |
228 | * @new_state: new cable attach status for @edev | |
229 | * | |
230 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
231 | * violated condition. | |
232 | */ | |
233 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
234 | { | |
235 | int i = 0; | |
236 | ||
237 | if (!edev->mutually_exclusive) | |
238 | return 0; | |
239 | ||
240 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 241 | int weight; |
bde68e60 | 242 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 243 | |
28c0ada6 | 244 | /* calculate the total number of bits set */ |
245 | weight = hweight32(correspondants); | |
246 | if (weight > 1) | |
247 | return i + 1; | |
bde68e60 MH |
248 | } |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
73b6ecdb | 253 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
2a9de9c0 CC |
254 | { |
255 | int i; | |
256 | ||
257 | /* Find the the index of extcon cable in edev->supported_cable */ | |
258 | for (i = 0; i < edev->max_supported; i++) { | |
259 | if (edev->supported_cable[i] == id) | |
260 | return i; | |
261 | } | |
262 | ||
263 | return -EINVAL; | |
264 | } | |
265 | ||
792e7e9e CC |
266 | static int get_extcon_type(unsigned int prop) |
267 | { | |
268 | switch (prop) { | |
269 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
270 | return EXTCON_TYPE_USB; | |
271 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
272 | return EXTCON_TYPE_CHG; | |
273 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
274 | return EXTCON_TYPE_JACK; | |
275 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
276 | return EXTCON_TYPE_DISP; | |
277 | default: | |
278 | return -EINVAL; | |
279 | } | |
280 | } | |
281 | ||
282 | static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index) | |
283 | { | |
284 | return !!(edev->state & BIT(index)); | |
285 | } | |
286 | ||
ab11af04 CC |
287 | static bool is_extcon_changed(struct extcon_dev *edev, int index, |
288 | bool new_state) | |
046050f6 | 289 | { |
ab11af04 CC |
290 | int state = !!(edev->state & BIT(index)); |
291 | return (state != new_state); | |
046050f6 CC |
292 | } |
293 | ||
792e7e9e CC |
294 | static bool is_extcon_property_supported(unsigned int id, unsigned int prop) |
295 | { | |
296 | int type; | |
297 | ||
298 | /* Check whether the property is supported or not. */ | |
299 | type = get_extcon_type(prop); | |
300 | if (type < 0) | |
301 | return false; | |
302 | ||
303 | /* Check whether a specific extcon id supports the property or not. */ | |
304 | return !!(extcon_info[id].type & type); | |
305 | } | |
306 | ||
7f2a0a16 CC |
307 | static int is_extcon_property_capability(struct extcon_dev *edev, |
308 | unsigned int id, int index,unsigned int prop) | |
309 | { | |
310 | struct extcon_cable *cable; | |
311 | int type, ret; | |
312 | ||
313 | /* Check whether the property is supported or not. */ | |
314 | type = get_extcon_type(prop); | |
315 | if (type < 0) | |
316 | return type; | |
317 | ||
318 | cable = &edev->cables[index]; | |
319 | ||
320 | switch (type) { | |
321 | case EXTCON_TYPE_USB: | |
322 | ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
323 | break; | |
324 | case EXTCON_TYPE_CHG: | |
325 | ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
326 | break; | |
327 | case EXTCON_TYPE_JACK: | |
328 | ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
329 | break; | |
330 | case EXTCON_TYPE_DISP: | |
331 | ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
332 | break; | |
333 | default: | |
334 | ret = -EINVAL; | |
335 | } | |
336 | ||
337 | return ret; | |
338 | } | |
339 | ||
792e7e9e CC |
340 | static void init_property(struct extcon_dev *edev, unsigned int id, int index) |
341 | { | |
342 | unsigned int type = extcon_info[id].type; | |
343 | struct extcon_cable *cable = &edev->cables[index]; | |
344 | ||
345 | if (EXTCON_TYPE_USB & type) | |
346 | memset(cable->usb_propval, 0, sizeof(cable->usb_propval)); | |
347 | if (EXTCON_TYPE_CHG & type) | |
348 | memset(cable->chg_propval, 0, sizeof(cable->chg_propval)); | |
349 | if (EXTCON_TYPE_JACK & type) | |
350 | memset(cable->jack_propval, 0, sizeof(cable->jack_propval)); | |
351 | if (EXTCON_TYPE_DISP & type) | |
352 | memset(cable->disp_propval, 0, sizeof(cable->disp_propval)); | |
353 | } | |
354 | ||
de55d871 MH |
355 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
356 | char *buf) | |
357 | { | |
806d9dd7 | 358 | int i, count = 0; |
cb8bb3a7 | 359 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 360 | |
806d9dd7 MH |
361 | if (edev->max_supported == 0) |
362 | return sprintf(buf, "%u\n", edev->state); | |
363 | ||
2a9de9c0 | 364 | for (i = 0; i < edev->max_supported; i++) { |
806d9dd7 | 365 | count += sprintf(buf + count, "%s=%d\n", |
55e4e2f1 | 366 | extcon_info[edev->supported_cable[i]].name, |
806d9dd7 MH |
367 | !!(edev->state & (1 << i))); |
368 | } | |
369 | ||
370 | return count; | |
371 | } | |
5d5321e9 | 372 | static DEVICE_ATTR_RO(state); |
de55d871 MH |
373 | |
374 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
375 | char *buf) | |
376 | { | |
cb8bb3a7 | 377 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 378 | |
71c3ffa5 | 379 | return sprintf(buf, "%s\n", edev->name); |
de55d871 | 380 | } |
af01da0e | 381 | static DEVICE_ATTR_RO(name); |
de55d871 | 382 | |
806d9dd7 MH |
383 | static ssize_t cable_name_show(struct device *dev, |
384 | struct device_attribute *attr, char *buf) | |
385 | { | |
386 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
387 | attr_name); | |
2a9de9c0 | 388 | int i = cable->cable_index; |
806d9dd7 MH |
389 | |
390 | return sprintf(buf, "%s\n", | |
55e4e2f1 | 391 | extcon_info[cable->edev->supported_cable[i]].name); |
806d9dd7 MH |
392 | } |
393 | ||
394 | static ssize_t cable_state_show(struct device *dev, | |
395 | struct device_attribute *attr, char *buf) | |
396 | { | |
397 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
398 | attr_state); | |
399 | ||
be052cc8 RQ |
400 | int i = cable->cable_index; |
401 | ||
806d9dd7 | 402 | return sprintf(buf, "%d\n", |
575c2b86 | 403 | extcon_get_state(cable->edev, cable->edev->supported_cable[i])); |
806d9dd7 MH |
404 | } |
405 | ||
de55d871 | 406 | /** |
ab11af04 CC |
407 | * extcon_sync() - Synchronize the states for both the attached/detached |
408 | * @edev: the extcon device that has the cable. | |
74c5d09b | 409 | * |
ab11af04 CC |
410 | * This function send a notification to synchronize the all states of a |
411 | * specific external connector | |
de55d871 | 412 | */ |
ab11af04 | 413 | int extcon_sync(struct extcon_dev *edev, unsigned int id) |
de55d871 MH |
414 | { |
415 | char name_buf[120]; | |
416 | char state_buf[120]; | |
417 | char *prop_buf; | |
418 | char *envp[3]; | |
419 | int env_offset = 0; | |
420 | int length; | |
046050f6 | 421 | int index; |
ab11af04 | 422 | int state; |
806d9dd7 | 423 | unsigned long flags; |
de55d871 | 424 | |
7eae43ae CC |
425 | if (!edev) |
426 | return -EINVAL; | |
427 | ||
ab11af04 CC |
428 | index = find_cable_index_by_id(edev, id); |
429 | if (index < 0) | |
430 | return index; | |
431 | ||
806d9dd7 | 432 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 433 | |
ab11af04 CC |
434 | state = !!(edev->state & BIT(index)); |
435 | raw_notifier_call_chain(&edev->nh[index], state, edev); | |
436 | ||
437 | /* This could be in interrupt handler */ | |
438 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
439 | if (!prop_buf) { | |
440 | /* Unlock early before uevent */ | |
806d9dd7 | 441 | spin_unlock_irqrestore(&edev->lock, flags); |
ab11af04 CC |
442 | |
443 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); | |
444 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | length = name_show(&edev->dev, NULL, prop_buf); | |
450 | if (length > 0) { | |
451 | if (prop_buf[length - 1] == '\n') | |
452 | prop_buf[length - 1] = 0; | |
453 | snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf); | |
454 | envp[env_offset++] = name_buf; | |
455 | } | |
456 | ||
457 | length = state_show(&edev->dev, NULL, prop_buf); | |
458 | if (length > 0) { | |
459 | if (prop_buf[length - 1] == '\n') | |
460 | prop_buf[length - 1] = 0; | |
461 | snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf); | |
462 | envp[env_offset++] = state_buf; | |
de55d871 | 463 | } |
ab11af04 CC |
464 | envp[env_offset] = NULL; |
465 | ||
466 | /* Unlock early before uevent */ | |
467 | spin_unlock_irqrestore(&edev->lock, flags); | |
468 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); | |
469 | free_page((unsigned long)prop_buf); | |
bde68e60 MH |
470 | |
471 | return 0; | |
de55d871 | 472 | } |
ab11af04 | 473 | EXPORT_SYMBOL_GPL(extcon_sync); |
de55d871 | 474 | |
806d9dd7 | 475 | /** |
575c2b86 | 476 | * extcon_get_state() - Get the state of a external connector. |
806d9dd7 | 477 | * @edev: the extcon device that has the cable. |
2a9de9c0 | 478 | * @id: the unique id of each external connector in extcon enumeration. |
806d9dd7 | 479 | */ |
575c2b86 | 480 | int extcon_get_state(struct extcon_dev *edev, const unsigned int id) |
806d9dd7 | 481 | { |
575c2b86 CC |
482 | int index, state; |
483 | unsigned long flags; | |
806d9dd7 | 484 | |
7eae43ae CC |
485 | if (!edev) |
486 | return -EINVAL; | |
487 | ||
2a9de9c0 CC |
488 | index = find_cable_index_by_id(edev, id); |
489 | if (index < 0) | |
490 | return index; | |
806d9dd7 | 491 | |
575c2b86 CC |
492 | spin_lock_irqsave(&edev->lock, flags); |
493 | state = is_extcon_attached(edev, index); | |
494 | spin_unlock_irqrestore(&edev->lock, flags); | |
806d9dd7 | 495 | |
575c2b86 | 496 | return state; |
806d9dd7 | 497 | } |
575c2b86 | 498 | EXPORT_SYMBOL_GPL(extcon_get_state); |
806d9dd7 | 499 | |
806d9dd7 | 500 | /** |
575c2b86 | 501 | * extcon_set_state() - Set the state of a external connector. |
ab11af04 | 502 | * without a notification. |
a75e1c73 | 503 | * @edev: the extcon device that has the cable. |
2a9de9c0 CC |
504 | * @id: the unique id of each external connector |
505 | * in extcon enumeration. | |
506 | * @state: the new cable status. The default semantics is | |
806d9dd7 | 507 | * true: attached / false: detached. |
ab11af04 CC |
508 | * |
509 | * This function only set the state of a external connector without | |
510 | * a notification. To synchronize the data of a external connector, | |
511 | * use extcon_set_state_sync() and extcon_sync(). | |
806d9dd7 | 512 | */ |
575c2b86 | 513 | int extcon_set_state(struct extcon_dev *edev, unsigned int id, |
2a9de9c0 | 514 | bool cable_state) |
806d9dd7 | 515 | { |
ab11af04 CC |
516 | unsigned long flags; |
517 | int index, ret = 0; | |
806d9dd7 | 518 | |
7eae43ae CC |
519 | if (!edev) |
520 | return -EINVAL; | |
521 | ||
2a9de9c0 CC |
522 | index = find_cable_index_by_id(edev, id); |
523 | if (index < 0) | |
524 | return index; | |
525 | ||
ab11af04 CC |
526 | spin_lock_irqsave(&edev->lock, flags); |
527 | ||
528 | /* Check whether the external connector's state is changed. */ | |
529 | if (!is_extcon_changed(edev, index, cable_state)) | |
530 | goto out; | |
531 | ||
532 | if (check_mutually_exclusive(edev, | |
533 | (edev->state & ~BIT(index)) | (cable_state & BIT(index)))) { | |
534 | ret = -EPERM; | |
535 | goto out; | |
536 | } | |
537 | ||
792e7e9e CC |
538 | /* |
539 | * Initialize the value of extcon property before setting | |
540 | * the detached state for an external connector. | |
541 | */ | |
542 | if (!cable_state) | |
543 | init_property(edev, id, index); | |
544 | ||
ab11af04 CC |
545 | /* Update the state for a external connector. */ |
546 | if (cable_state) | |
547 | edev->state |= BIT(index); | |
548 | else | |
549 | edev->state &= ~(BIT(index)); | |
550 | out: | |
551 | spin_unlock_irqrestore(&edev->lock, flags); | |
552 | ||
553 | return ret; | |
806d9dd7 | 554 | } |
575c2b86 | 555 | EXPORT_SYMBOL_GPL(extcon_set_state); |
806d9dd7 | 556 | |
ab11af04 CC |
557 | /** |
558 | * extcon_set_state_sync() - Set the state of a external connector | |
559 | * with a notification. | |
560 | * @edev: the extcon device that has the cable. | |
561 | * @id: the unique id of each external connector | |
562 | * in extcon enumeration. | |
563 | * @state: the new cable status. The default semantics is | |
564 | * true: attached / false: detached. | |
565 | * | |
566 | * This function set the state of external connector and synchronize the data | |
567 | * by usning a notification. | |
568 | */ | |
569 | int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, | |
570 | bool cable_state) | |
571 | { | |
572 | int ret, index; | |
573 | unsigned long flags; | |
574 | ||
575 | index = find_cable_index_by_id(edev, id); | |
576 | if (index < 0) | |
577 | return index; | |
578 | ||
579 | /* Check whether the external connector's state is changed. */ | |
580 | spin_lock_irqsave(&edev->lock, flags); | |
581 | ret = is_extcon_changed(edev, index, cable_state); | |
582 | spin_unlock_irqrestore(&edev->lock, flags); | |
583 | if (!ret) | |
584 | return 0; | |
585 | ||
586 | ret = extcon_set_state(edev, id, cable_state); | |
587 | if (ret < 0) | |
588 | return ret; | |
589 | ||
590 | return extcon_sync(edev, id); | |
591 | } | |
592 | EXPORT_SYMBOL_GPL(extcon_set_state_sync); | |
593 | ||
792e7e9e CC |
594 | /** |
595 | * extcon_get_property() - Get the property value of a specific cable. | |
596 | * @edev: the extcon device that has the cable. | |
597 | * @id: the unique id of each external connector | |
598 | * in extcon enumeration. | |
599 | * @prop: the property id among enum extcon_property. | |
600 | * @prop_val: the pointer which store the value of property. | |
601 | * | |
602 | * When getting the property value of external connector, the external connector | |
603 | * should be attached. If detached state, function just return 0 without | |
604 | * property value. Also, the each property should be included in the list of | |
605 | * supported properties according to the type of external connectors. | |
606 | * | |
607 | * Returns 0 if success or error number if fail | |
608 | */ | |
609 | int extcon_get_property(struct extcon_dev *edev, unsigned int id, | |
610 | unsigned int prop, | |
611 | union extcon_property_value *prop_val) | |
612 | { | |
613 | struct extcon_cable *cable; | |
614 | unsigned long flags; | |
615 | int index, ret = 0; | |
616 | ||
617 | *prop_val = (union extcon_property_value)(0); | |
618 | ||
619 | if (!edev) | |
620 | return -EINVAL; | |
621 | ||
622 | /* Check whether the property is supported or not */ | |
623 | if (!is_extcon_property_supported(id, prop)) | |
624 | return -EINVAL; | |
625 | ||
626 | /* Find the cable index of external connector by using id */ | |
627 | index = find_cable_index_by_id(edev, id); | |
628 | if (index < 0) | |
629 | return index; | |
630 | ||
631 | spin_lock_irqsave(&edev->lock, flags); | |
632 | ||
7f2a0a16 CC |
633 | /* Check whether the property is available or not. */ |
634 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
635 | spin_unlock_irqrestore(&edev->lock, flags); | |
636 | return -EPERM; | |
637 | } | |
638 | ||
792e7e9e CC |
639 | /* |
640 | * Check whether the external connector is attached. | |
641 | * If external connector is detached, the user can not | |
642 | * get the property value. | |
643 | */ | |
644 | if (!is_extcon_attached(edev, index)) { | |
645 | spin_unlock_irqrestore(&edev->lock, flags); | |
646 | return 0; | |
647 | } | |
648 | ||
649 | cable = &edev->cables[index]; | |
650 | ||
651 | /* Get the property value according to extcon type */ | |
652 | switch (prop) { | |
653 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
654 | *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN]; | |
655 | break; | |
656 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
657 | *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN]; | |
658 | break; | |
659 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
660 | *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN]; | |
661 | break; | |
662 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
663 | *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN]; | |
664 | break; | |
665 | default: | |
666 | ret = -EINVAL; | |
667 | break; | |
668 | } | |
669 | ||
670 | spin_unlock_irqrestore(&edev->lock, flags); | |
671 | ||
672 | return ret; | |
673 | } | |
674 | EXPORT_SYMBOL_GPL(extcon_get_property); | |
675 | ||
676 | /** | |
677 | * extcon_set_property() - Set the property value of a specific cable. | |
678 | * @edev: the extcon device that has the cable. | |
679 | * @id: the unique id of each external connector | |
680 | * in extcon enumeration. | |
681 | * @prop: the property id among enum extcon_property. | |
682 | * @prop_val: the pointer including the new value of property. | |
683 | * | |
684 | * The each property should be included in the list of supported properties | |
685 | * according to the type of external connectors. | |
686 | * | |
687 | * Returns 0 if success or error number if fail | |
688 | */ | |
689 | int extcon_set_property(struct extcon_dev *edev, unsigned int id, | |
690 | unsigned int prop, | |
691 | union extcon_property_value prop_val) | |
692 | { | |
693 | struct extcon_cable *cable; | |
694 | unsigned long flags; | |
695 | int index, ret = 0; | |
696 | ||
697 | if (!edev) | |
698 | return -EINVAL; | |
699 | ||
700 | /* Check whether the property is supported or not */ | |
701 | if (!is_extcon_property_supported(id, prop)) | |
702 | return -EINVAL; | |
703 | ||
704 | /* Find the cable index of external connector by using id */ | |
705 | index = find_cable_index_by_id(edev, id); | |
706 | if (index < 0) | |
707 | return index; | |
708 | ||
709 | spin_lock_irqsave(&edev->lock, flags); | |
710 | ||
7f2a0a16 CC |
711 | /* Check whether the property is available or not. */ |
712 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
713 | spin_unlock_irqrestore(&edev->lock, flags); | |
714 | return -EPERM; | |
715 | } | |
716 | ||
792e7e9e CC |
717 | cable = &edev->cables[index]; |
718 | ||
719 | /* Set the property value according to extcon type */ | |
720 | switch (prop) { | |
721 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
722 | cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val; | |
723 | break; | |
724 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
725 | cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val; | |
726 | break; | |
727 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
728 | cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val; | |
729 | break; | |
730 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
731 | cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val; | |
732 | break; | |
733 | default: | |
734 | ret = -EINVAL; | |
735 | break; | |
736 | } | |
737 | ||
738 | spin_unlock_irqrestore(&edev->lock, flags); | |
739 | ||
740 | return ret; | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(extcon_set_property); | |
743 | ||
ab11af04 CC |
744 | /** |
745 | * extcon_set_property_sync() - Set the property value of a specific cable | |
746 | with a notification. | |
747 | * @prop_val: the pointer including the new value of property. | |
748 | * | |
749 | * When setting the property value of external connector, the external connector | |
750 | * should be attached. The each property should be included in the list of | |
751 | * supported properties according to the type of external connectors. | |
752 | * | |
753 | * Returns 0 if success or error number if fail | |
754 | */ | |
755 | int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id, | |
756 | unsigned int prop, | |
757 | union extcon_property_value prop_val) | |
758 | { | |
759 | int ret; | |
760 | ||
761 | ret = extcon_set_property(edev, id, prop, prop_val); | |
762 | if (ret < 0) | |
763 | return ret; | |
764 | ||
765 | return extcon_sync(edev, id); | |
766 | } | |
767 | EXPORT_SYMBOL_GPL(extcon_set_property_sync); | |
768 | ||
7f2a0a16 CC |
769 | /** |
770 | * extcon_get_property_capability() - Get the capability of property | |
771 | * of an external connector. | |
772 | * @edev: the extcon device that has the cable. | |
773 | * @id: the unique id of each external connector | |
774 | * in extcon enumeration. | |
775 | * @prop: the property id among enum extcon_property. | |
776 | * | |
777 | * Returns 1 if the property is available or 0 if not available. | |
778 | */ | |
779 | int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id, | |
780 | unsigned int prop) | |
781 | { | |
782 | int index; | |
783 | ||
784 | if (!edev) | |
785 | return -EINVAL; | |
786 | ||
787 | /* Check whether the property is supported or not */ | |
788 | if (!is_extcon_property_supported(id, prop)) | |
789 | return -EINVAL; | |
790 | ||
791 | /* Find the cable index of external connector by using id */ | |
792 | index = find_cable_index_by_id(edev, id); | |
793 | if (index < 0) | |
794 | return index; | |
795 | ||
796 | return is_extcon_property_capability(edev, id, index, prop); | |
797 | } | |
798 | EXPORT_SYMBOL_GPL(extcon_get_property_capability); | |
799 | ||
800 | /** | |
801 | * extcon_set_property_capability() - Set the capability of a property | |
802 | * of an external connector. | |
803 | * @edev: the extcon device that has the cable. | |
804 | * @id: the unique id of each external connector | |
805 | * in extcon enumeration. | |
806 | * @prop: the property id among enum extcon_property. | |
807 | * | |
808 | * This function set the capability of a property for an external connector | |
809 | * to mark the bit in capability bitmap which mean the available state of | |
810 | * a property. | |
811 | * | |
812 | * Returns 0 if success or error number if fail | |
813 | */ | |
814 | int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id, | |
815 | unsigned int prop) | |
816 | { | |
817 | struct extcon_cable *cable; | |
818 | int index, type, ret = 0; | |
819 | ||
820 | if (!edev) | |
821 | return -EINVAL; | |
822 | ||
823 | /* Check whether the property is supported or not. */ | |
824 | if (!is_extcon_property_supported(id, prop)) | |
825 | return -EINVAL; | |
826 | ||
827 | /* Find the cable index of external connector by using id. */ | |
828 | index = find_cable_index_by_id(edev, id); | |
829 | if (index < 0) | |
830 | return index; | |
831 | ||
832 | type = get_extcon_type(prop); | |
833 | if (type < 0) | |
834 | return type; | |
835 | ||
836 | cable = &edev->cables[index]; | |
837 | ||
838 | switch (type) { | |
839 | case EXTCON_TYPE_USB: | |
840 | __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
841 | break; | |
842 | case EXTCON_TYPE_CHG: | |
843 | __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
844 | break; | |
845 | case EXTCON_TYPE_JACK: | |
846 | __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
847 | break; | |
848 | case EXTCON_TYPE_DISP: | |
849 | __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
850 | break; | |
851 | default: | |
852 | ret = -EINVAL; | |
853 | } | |
854 | ||
855 | return ret; | |
856 | } | |
857 | EXPORT_SYMBOL_GPL(extcon_set_property_capability); | |
858 | ||
74c5d09b DK |
859 | /** |
860 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
861 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
862 | */ | |
863 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
864 | { | |
865 | struct extcon_dev *sd; | |
866 | ||
7eae43ae CC |
867 | if (!extcon_name) |
868 | return ERR_PTR(-EINVAL); | |
869 | ||
74c5d09b DK |
870 | mutex_lock(&extcon_dev_list_lock); |
871 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
872 | if (!strcmp(sd->name, extcon_name)) | |
873 | goto out; | |
874 | } | |
875 | sd = NULL; | |
876 | out: | |
877 | mutex_unlock(&extcon_dev_list_lock); | |
878 | return sd; | |
879 | } | |
880 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
881 | ||
882 | /** | |
c338bb03 | 883 | * extcon_register_notifier() - Register a notifiee to get notified by |
a75e1c73 | 884 | * any attach status changes from the extcon. |
046050f6 CC |
885 | * @edev: the extcon device that has the external connecotr. |
886 | * @id: the unique id of each external connector in extcon enumeration. | |
74c5d09b | 887 | * @nb: a notifier block to be registered. |
806d9dd7 MH |
888 | * |
889 | * Note that the second parameter given to the callback of nb (val) is | |
890 | * "old_state", not the current state. The current state can be retrieved | |
891 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b | 892 | */ |
73b6ecdb | 893 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 894 | struct notifier_block *nb) |
74c5d09b | 895 | { |
66bee35f | 896 | unsigned long flags; |
2c8116a1 | 897 | int ret, idx = -EINVAL; |
046050f6 | 898 | |
830ae442 | 899 | if (!nb) |
7eae43ae CC |
900 | return -EINVAL; |
901 | ||
830ae442 CC |
902 | if (edev) { |
903 | idx = find_cable_index_by_id(edev, id); | |
a05f44c8 SB |
904 | if (idx < 0) |
905 | return idx; | |
66bee35f | 906 | |
830ae442 CC |
907 | spin_lock_irqsave(&edev->lock, flags); |
908 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); | |
909 | spin_unlock_irqrestore(&edev->lock, flags); | |
910 | } else { | |
911 | struct extcon_dev *extd; | |
912 | ||
913 | mutex_lock(&extcon_dev_list_lock); | |
914 | list_for_each_entry(extd, &extcon_dev_list, entry) { | |
915 | idx = find_cable_index_by_id(extd, id); | |
916 | if (idx >= 0) | |
917 | break; | |
918 | } | |
919 | mutex_unlock(&extcon_dev_list_lock); | |
920 | ||
921 | if (idx >= 0) { | |
922 | edev = extd; | |
923 | return extcon_register_notifier(extd, id, nb); | |
924 | } else { | |
925 | ret = -ENODEV; | |
926 | } | |
927 | } | |
66bee35f HG |
928 | |
929 | return ret; | |
74c5d09b DK |
930 | } |
931 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
932 | ||
933 | /** | |
c338bb03 | 934 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
046050f6 CC |
935 | * @edev: the extcon device that has the external connecotr. |
936 | * @id: the unique id of each external connector in extcon enumeration. | |
937 | * @nb: a notifier block to be registered. | |
74c5d09b | 938 | */ |
73b6ecdb | 939 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 940 | struct notifier_block *nb) |
74c5d09b | 941 | { |
66bee35f | 942 | unsigned long flags; |
046050f6 CC |
943 | int ret, idx; |
944 | ||
7eae43ae CC |
945 | if (!edev || !nb) |
946 | return -EINVAL; | |
947 | ||
046050f6 | 948 | idx = find_cable_index_by_id(edev, id); |
a05f44c8 SB |
949 | if (idx < 0) |
950 | return idx; | |
66bee35f HG |
951 | |
952 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 953 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
66bee35f HG |
954 | spin_unlock_irqrestore(&edev->lock, flags); |
955 | ||
956 | return ret; | |
74c5d09b DK |
957 | } |
958 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
959 | ||
af01da0e GKH |
960 | static struct attribute *extcon_attrs[] = { |
961 | &dev_attr_state.attr, | |
962 | &dev_attr_name.attr, | |
963 | NULL, | |
de55d871 | 964 | }; |
af01da0e | 965 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
966 | |
967 | static int create_extcon_class(void) | |
968 | { | |
969 | if (!extcon_class) { | |
970 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
971 | if (IS_ERR(extcon_class)) | |
972 | return PTR_ERR(extcon_class); | |
af01da0e | 973 | extcon_class->dev_groups = extcon_groups; |
de55d871 | 974 | |
449a2bf5 | 975 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
976 | switch_class = class_compat_register("switch"); |
977 | if (WARN(!switch_class, "cannot allocate")) | |
978 | return -ENOMEM; | |
449a2bf5 | 979 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
980 | } |
981 | ||
982 | return 0; | |
983 | } | |
984 | ||
de55d871 MH |
985 | static void extcon_dev_release(struct device *dev) |
986 | { | |
de55d871 MH |
987 | } |
988 | ||
bde68e60 | 989 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
990 | static void dummy_sysfs_dev_release(struct device *dev) |
991 | { | |
992 | } | |
993 | ||
a9af6522 CC |
994 | /* |
995 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
2a9de9c0 | 996 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
a9af6522 CC |
997 | * If supported_cable is NULL, cable name related APIs |
998 | * are disabled. | |
999 | * | |
1000 | * This function allocates the memory for extcon device without allocating | |
1001 | * memory in each extcon provider driver and initialize default setting for | |
1002 | * extcon device. | |
1003 | * | |
1004 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail | |
1005 | */ | |
73b6ecdb | 1006 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
a9af6522 CC |
1007 | { |
1008 | struct extcon_dev *edev; | |
1009 | ||
7eae43ae CC |
1010 | if (!supported_cable) |
1011 | return ERR_PTR(-EINVAL); | |
1012 | ||
a9af6522 CC |
1013 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
1014 | if (!edev) | |
1015 | return ERR_PTR(-ENOMEM); | |
1016 | ||
1017 | edev->max_supported = 0; | |
1018 | edev->supported_cable = supported_cable; | |
1019 | ||
1020 | return edev; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * extcon_dev_free() - Free the memory of extcon device. | |
1025 | * @edev: the extcon device to free | |
1026 | */ | |
1027 | void extcon_dev_free(struct extcon_dev *edev) | |
1028 | { | |
1029 | kfree(edev); | |
1030 | } | |
1031 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
1032 | ||
de55d871 MH |
1033 | /** |
1034 | * extcon_dev_register() - Register a new extcon device | |
1035 | * @edev : the new extcon device (should be allocated before calling) | |
de55d871 MH |
1036 | * |
1037 | * Among the members of edev struct, please set the "user initializing data" | |
1038 | * in any case and set the "optional callbacks" if required. However, please | |
1039 | * do not set the values of "internal data", which are initialized by | |
1040 | * this function. | |
1041 | */ | |
42d7d753 | 1042 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 1043 | { |
806d9dd7 | 1044 | int ret, index = 0; |
71c3ffa5 | 1045 | static atomic_t edev_no = ATOMIC_INIT(-1); |
de55d871 MH |
1046 | |
1047 | if (!extcon_class) { | |
1048 | ret = create_extcon_class(); | |
1049 | if (ret < 0) | |
1050 | return ret; | |
1051 | } | |
1052 | ||
7eae43ae | 1053 | if (!edev || !edev->supported_cable) |
2a9de9c0 CC |
1054 | return -EINVAL; |
1055 | ||
1056 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); | |
806d9dd7 | 1057 | |
2a9de9c0 | 1058 | edev->max_supported = index; |
806d9dd7 | 1059 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
1060 | dev_err(&edev->dev, |
1061 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
1062 | return -EINVAL; |
1063 | } | |
1064 | ||
dae61651 CC |
1065 | edev->dev.class = extcon_class; |
1066 | edev->dev.release = extcon_dev_release; | |
de55d871 | 1067 | |
71c3ffa5 | 1068 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
1069 | if (IS_ERR_OR_NULL(edev->name)) { |
1070 | dev_err(&edev->dev, | |
1071 | "extcon device name is null\n"); | |
1072 | return -EINVAL; | |
1073 | } | |
71c3ffa5 CC |
1074 | dev_set_name(&edev->dev, "extcon%lu", |
1075 | (unsigned long)atomic_inc_return(&edev_no)); | |
806d9dd7 MH |
1076 | |
1077 | if (edev->max_supported) { | |
1078 | char buf[10]; | |
1079 | char *str; | |
1080 | struct extcon_cable *cable; | |
1081 | ||
1082 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
1083 | edev->max_supported, GFP_KERNEL); | |
1084 | if (!edev->cables) { | |
1085 | ret = -ENOMEM; | |
1086 | goto err_sysfs_alloc; | |
1087 | } | |
1088 | for (index = 0; index < edev->max_supported; index++) { | |
1089 | cable = &edev->cables[index]; | |
1090 | ||
1091 | snprintf(buf, 10, "cable.%d", index); | |
1092 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
1093 | GFP_KERNEL); | |
1094 | if (!str) { | |
1095 | for (index--; index >= 0; index--) { | |
1096 | cable = &edev->cables[index]; | |
1097 | kfree(cable->attr_g.name); | |
1098 | } | |
1099 | ret = -ENOMEM; | |
1100 | ||
1101 | goto err_alloc_cables; | |
1102 | } | |
1103 | strcpy(str, buf); | |
1104 | ||
1105 | cable->edev = edev; | |
1106 | cable->cable_index = index; | |
1107 | cable->attrs[0] = &cable->attr_name.attr; | |
1108 | cable->attrs[1] = &cable->attr_state.attr; | |
1109 | cable->attrs[2] = NULL; | |
1110 | cable->attr_g.name = str; | |
1111 | cable->attr_g.attrs = cable->attrs; | |
1112 | ||
9baf3220 | 1113 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
1114 | cable->attr_name.attr.name = "name"; |
1115 | cable->attr_name.attr.mode = 0444; | |
1116 | cable->attr_name.show = cable_name_show; | |
1117 | ||
9baf3220 | 1118 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 1119 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 1120 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 1121 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
1122 | } |
1123 | } | |
1124 | ||
bde68e60 MH |
1125 | if (edev->max_supported && edev->mutually_exclusive) { |
1126 | char buf[80]; | |
1127 | char *name; | |
1128 | ||
1129 | /* Count the size of mutually_exclusive array */ | |
1130 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1131 | ; | |
1132 | ||
1133 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
1134 | (index + 1), GFP_KERNEL); | |
1135 | if (!edev->attrs_muex) { | |
1136 | ret = -ENOMEM; | |
1137 | goto err_muex; | |
1138 | } | |
1139 | ||
1140 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
1141 | index, GFP_KERNEL); | |
1142 | if (!edev->d_attrs_muex) { | |
1143 | ret = -ENOMEM; | |
1144 | kfree(edev->attrs_muex); | |
1145 | goto err_muex; | |
1146 | } | |
1147 | ||
1148 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
1149 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
1150 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
1151 | GFP_KERNEL); | |
1152 | if (!name) { | |
1153 | for (index--; index >= 0; index--) { | |
1154 | kfree(edev->d_attrs_muex[index].attr. | |
1155 | name); | |
1156 | } | |
1157 | kfree(edev->d_attrs_muex); | |
1158 | kfree(edev->attrs_muex); | |
1159 | ret = -ENOMEM; | |
1160 | goto err_muex; | |
1161 | } | |
1162 | strcpy(name, buf); | |
9baf3220 | 1163 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
1164 | edev->d_attrs_muex[index].attr.name = name; |
1165 | edev->d_attrs_muex[index].attr.mode = 0000; | |
1166 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
1167 | .attr; | |
1168 | } | |
1169 | edev->attr_g_muex.name = muex_name; | |
1170 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
1171 | ||
1172 | } | |
1173 | ||
806d9dd7 MH |
1174 | if (edev->max_supported) { |
1175 | edev->extcon_dev_type.groups = | |
1176 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 1177 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
1178 | if (!edev->extcon_dev_type.groups) { |
1179 | ret = -ENOMEM; | |
1180 | goto err_alloc_groups; | |
1181 | } | |
1182 | ||
dae61651 | 1183 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
1184 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
1185 | ||
1186 | for (index = 0; index < edev->max_supported; index++) | |
1187 | edev->extcon_dev_type.groups[index] = | |
1188 | &edev->cables[index].attr_g; | |
bde68e60 MH |
1189 | if (edev->mutually_exclusive) |
1190 | edev->extcon_dev_type.groups[index] = | |
1191 | &edev->attr_g_muex; | |
806d9dd7 | 1192 | |
dae61651 | 1193 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
1194 | } |
1195 | ||
dae61651 | 1196 | ret = device_register(&edev->dev); |
de55d871 | 1197 | if (ret) { |
dae61651 | 1198 | put_device(&edev->dev); |
de55d871 MH |
1199 | goto err_dev; |
1200 | } | |
449a2bf5 | 1201 | #if defined(CONFIG_ANDROID) |
de55d871 | 1202 | if (switch_class) |
dae61651 | 1203 | ret = class_compat_create_link(switch_class, &edev->dev, NULL); |
449a2bf5 | 1204 | #endif /* CONFIG_ANDROID */ |
de55d871 | 1205 | |
806d9dd7 MH |
1206 | spin_lock_init(&edev->lock); |
1207 | ||
046050f6 CC |
1208 | edev->nh = devm_kzalloc(&edev->dev, |
1209 | sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL); | |
1210 | if (!edev->nh) { | |
1211 | ret = -ENOMEM; | |
1212 | goto err_dev; | |
1213 | } | |
1214 | ||
1215 | for (index = 0; index < edev->max_supported; index++) | |
1216 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); | |
74c5d09b | 1217 | |
dae61651 | 1218 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 1219 | edev->state = 0; |
74c5d09b DK |
1220 | |
1221 | mutex_lock(&extcon_dev_list_lock); | |
1222 | list_add(&edev->entry, &extcon_dev_list); | |
1223 | mutex_unlock(&extcon_dev_list_lock); | |
1224 | ||
de55d871 MH |
1225 | return 0; |
1226 | ||
1227 | err_dev: | |
806d9dd7 MH |
1228 | if (edev->max_supported) |
1229 | kfree(edev->extcon_dev_type.groups); | |
1230 | err_alloc_groups: | |
bde68e60 MH |
1231 | if (edev->max_supported && edev->mutually_exclusive) { |
1232 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1233 | kfree(edev->d_attrs_muex[index].attr.name); | |
1234 | kfree(edev->d_attrs_muex); | |
1235 | kfree(edev->attrs_muex); | |
1236 | } | |
1237 | err_muex: | |
806d9dd7 MH |
1238 | for (index = 0; index < edev->max_supported; index++) |
1239 | kfree(edev->cables[index].attr_g.name); | |
1240 | err_alloc_cables: | |
1241 | if (edev->max_supported) | |
1242 | kfree(edev->cables); | |
1243 | err_sysfs_alloc: | |
de55d871 MH |
1244 | return ret; |
1245 | } | |
1246 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
1247 | ||
1248 | /** | |
1249 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 1250 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
1251 | * |
1252 | * Note that this does not call kfree(edev) because edev was not allocated | |
1253 | * by this class. | |
1254 | */ | |
1255 | void extcon_dev_unregister(struct extcon_dev *edev) | |
1256 | { | |
57e7cd37 | 1257 | int index; |
1258 | ||
7eae43ae CC |
1259 | if (!edev) |
1260 | return; | |
1261 | ||
57e7cd37 | 1262 | mutex_lock(&extcon_dev_list_lock); |
1263 | list_del(&edev->entry); | |
1264 | mutex_unlock(&extcon_dev_list_lock); | |
1265 | ||
dae61651 CC |
1266 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
1267 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
1268 | dev_name(&edev->dev)); | |
57e7cd37 | 1269 | return; |
1270 | } | |
1271 | ||
7585ca0d WX |
1272 | device_unregister(&edev->dev); |
1273 | ||
57e7cd37 | 1274 | if (edev->mutually_exclusive && edev->max_supported) { |
1275 | for (index = 0; edev->mutually_exclusive[index]; | |
1276 | index++) | |
1277 | kfree(edev->d_attrs_muex[index].attr.name); | |
1278 | kfree(edev->d_attrs_muex); | |
1279 | kfree(edev->attrs_muex); | |
1280 | } | |
1281 | ||
1282 | for (index = 0; index < edev->max_supported; index++) | |
1283 | kfree(edev->cables[index].attr_g.name); | |
1284 | ||
1285 | if (edev->max_supported) { | |
1286 | kfree(edev->extcon_dev_type.groups); | |
1287 | kfree(edev->cables); | |
1288 | } | |
1289 | ||
1290 | #if defined(CONFIG_ANDROID) | |
1291 | if (switch_class) | |
dae61651 | 1292 | class_compat_remove_link(switch_class, &edev->dev, NULL); |
57e7cd37 | 1293 | #endif |
dae61651 | 1294 | put_device(&edev->dev); |
de55d871 MH |
1295 | } |
1296 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
1297 | ||
1ad94ffe CC |
1298 | #ifdef CONFIG_OF |
1299 | /* | |
1300 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree | |
1301 | * @dev - instance to the given device | |
1302 | * @index - index into list of extcon_dev | |
1303 | * | |
1304 | * return the instance of extcon device | |
1305 | */ | |
1306 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1307 | { | |
1308 | struct device_node *node; | |
1309 | struct extcon_dev *edev; | |
1310 | ||
7eae43ae CC |
1311 | if (!dev) |
1312 | return ERR_PTR(-EINVAL); | |
1313 | ||
1ad94ffe | 1314 | if (!dev->of_node) { |
e8752b7a | 1315 | dev_dbg(dev, "device does not have a device node entry\n"); |
1ad94ffe CC |
1316 | return ERR_PTR(-EINVAL); |
1317 | } | |
1318 | ||
1319 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
1320 | if (!node) { | |
e8752b7a | 1321 | dev_dbg(dev, "failed to get phandle in %s node\n", |
1ad94ffe CC |
1322 | dev->of_node->full_name); |
1323 | return ERR_PTR(-ENODEV); | |
1324 | } | |
1325 | ||
f841afb1 TF |
1326 | mutex_lock(&extcon_dev_list_lock); |
1327 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
1328 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
1329 | mutex_unlock(&extcon_dev_list_lock); | |
5d5c4c13 | 1330 | of_node_put(node); |
f841afb1 TF |
1331 | return edev; |
1332 | } | |
1ad94ffe | 1333 | } |
f841afb1 | 1334 | mutex_unlock(&extcon_dev_list_lock); |
5d5c4c13 | 1335 | of_node_put(node); |
1ad94ffe | 1336 | |
f841afb1 | 1337 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
1338 | } |
1339 | #else | |
1340 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1341 | { | |
1342 | return ERR_PTR(-ENOSYS); | |
1343 | } | |
1344 | #endif /* CONFIG_OF */ | |
1345 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
1346 | ||
707d7550 CC |
1347 | /** |
1348 | * extcon_get_edev_name() - Get the name of the extcon device. | |
1349 | * @edev: the extcon device | |
1350 | */ | |
1351 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
1352 | { | |
1353 | return !edev ? NULL : edev->name; | |
1354 | } | |
1355 | ||
de55d871 MH |
1356 | static int __init extcon_class_init(void) |
1357 | { | |
1358 | return create_extcon_class(); | |
1359 | } | |
1360 | module_init(extcon_class_init); | |
1361 | ||
1362 | static void __exit extcon_class_exit(void) | |
1363 | { | |
0dc77b6d PH |
1364 | #if defined(CONFIG_ANDROID) |
1365 | class_compat_unregister(switch_class); | |
1366 | #endif | |
de55d871 MH |
1367 | class_destroy(extcon_class); |
1368 | } | |
1369 | module_exit(extcon_class_exit); | |
1370 | ||
2a9de9c0 | 1371 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 MH |
1372 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); |
1373 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
1374 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
1375 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
1376 | MODULE_LICENSE("GPL"); |