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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 | }, | |
7fe95fb8 CC |
96 | [EXTCON_CHG_WPT] = { |
97 | .type = EXTCON_TYPE_CHG, | |
98 | .id = EXTCON_CHG_WPT, | |
99 | .name = "WPT", | |
100 | }, | |
8e9bc36d | 101 | |
11eecf91 | 102 | /* Jack external connector */ |
55e4e2f1 CC |
103 | [EXTCON_JACK_MICROPHONE] = { |
104 | .type = EXTCON_TYPE_JACK, | |
105 | .id = EXTCON_JACK_MICROPHONE, | |
106 | .name = "MICROPHONE", | |
107 | }, | |
108 | [EXTCON_JACK_HEADPHONE] = { | |
109 | .type = EXTCON_TYPE_JACK, | |
110 | .id = EXTCON_JACK_HEADPHONE, | |
111 | .name = "HEADPHONE", | |
112 | }, | |
113 | [EXTCON_JACK_LINE_IN] = { | |
114 | .type = EXTCON_TYPE_JACK, | |
115 | .id = EXTCON_JACK_LINE_IN, | |
116 | .name = "LINE-IN", | |
117 | }, | |
118 | [EXTCON_JACK_LINE_OUT] = { | |
119 | .type = EXTCON_TYPE_JACK, | |
120 | .id = EXTCON_JACK_LINE_OUT, | |
121 | .name = "LINE-OUT", | |
122 | }, | |
123 | [EXTCON_JACK_VIDEO_IN] = { | |
124 | .type = EXTCON_TYPE_JACK, | |
125 | .id = EXTCON_JACK_VIDEO_IN, | |
126 | .name = "VIDEO-IN", | |
127 | }, | |
128 | [EXTCON_JACK_VIDEO_OUT] = { | |
129 | .type = EXTCON_TYPE_JACK, | |
130 | .id = EXTCON_JACK_VIDEO_OUT, | |
131 | .name = "VIDEO-OUT", | |
132 | }, | |
133 | [EXTCON_JACK_SPDIF_IN] = { | |
134 | .type = EXTCON_TYPE_JACK, | |
135 | .id = EXTCON_JACK_SPDIF_IN, | |
136 | .name = "SPDIF-IN", | |
137 | }, | |
138 | [EXTCON_JACK_SPDIF_OUT] = { | |
139 | .type = EXTCON_TYPE_JACK, | |
140 | .id = EXTCON_JACK_SPDIF_OUT, | |
141 | .name = "SPDIF-OUT", | |
142 | }, | |
8e9bc36d | 143 | |
11eecf91 | 144 | /* Display external connector */ |
55e4e2f1 CC |
145 | [EXTCON_DISP_HDMI] = { |
146 | .type = EXTCON_TYPE_DISP, | |
147 | .id = EXTCON_DISP_HDMI, | |
148 | .name = "HDMI", | |
149 | }, | |
150 | [EXTCON_DISP_MHL] = { | |
151 | .type = EXTCON_TYPE_DISP, | |
152 | .id = EXTCON_DISP_MHL, | |
153 | .name = "MHL", | |
154 | }, | |
155 | [EXTCON_DISP_DVI] = { | |
156 | .type = EXTCON_TYPE_DISP, | |
157 | .id = EXTCON_DISP_DVI, | |
158 | .name = "DVI", | |
159 | }, | |
160 | [EXTCON_DISP_VGA] = { | |
161 | .type = EXTCON_TYPE_DISP, | |
162 | .id = EXTCON_DISP_VGA, | |
163 | .name = "VGA", | |
164 | }, | |
2164188d CZ |
165 | [EXTCON_DISP_DP] = { |
166 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
167 | .id = EXTCON_DISP_DP, | |
168 | .name = "DP", | |
169 | }, | |
9c0595d6 CC |
170 | [EXTCON_DISP_HMD] = { |
171 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
172 | .id = EXTCON_DISP_HMD, | |
173 | .name = "HMD", | |
174 | }, | |
8e9bc36d | 175 | |
11eecf91 | 176 | /* Miscellaneous external connector */ |
55e4e2f1 CC |
177 | [EXTCON_DOCK] = { |
178 | .type = EXTCON_TYPE_MISC, | |
179 | .id = EXTCON_DOCK, | |
180 | .name = "DOCK", | |
181 | }, | |
182 | [EXTCON_JIG] = { | |
183 | .type = EXTCON_TYPE_MISC, | |
184 | .id = EXTCON_JIG, | |
185 | .name = "JIG", | |
186 | }, | |
187 | [EXTCON_MECHANICAL] = { | |
188 | .type = EXTCON_TYPE_MISC, | |
189 | .id = EXTCON_MECHANICAL, | |
190 | .name = "MECHANICAL", | |
191 | }, | |
192 | ||
193 | { /* sentinel */ } | |
806d9dd7 MH |
194 | }; |
195 | ||
20f7b53d CC |
196 | /** |
197 | * struct extcon_cable - An internal data for each cable of extcon device. | |
198 | * @edev: The extcon device | |
199 | * @cable_index: Index of this cable in the edev | |
200 | * @attr_g: Attribute group for the cable | |
201 | * @attr_name: "name" sysfs entry | |
202 | * @attr_state: "state" sysfs entry | |
203 | * @attrs: Array pointing to attr_name and attr_state for attr_g | |
204 | */ | |
205 | struct extcon_cable { | |
206 | struct extcon_dev *edev; | |
207 | int cable_index; | |
208 | ||
209 | struct attribute_group attr_g; | |
210 | struct device_attribute attr_name; | |
211 | struct device_attribute attr_state; | |
212 | ||
213 | struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ | |
792e7e9e CC |
214 | |
215 | union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT]; | |
216 | union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT]; | |
217 | union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT]; | |
218 | union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT]; | |
7f2a0a16 CC |
219 | |
220 | unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)]; | |
221 | unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)]; | |
222 | unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)]; | |
223 | unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)]; | |
20f7b53d CC |
224 | }; |
225 | ||
be3a07f7 | 226 | static struct class *extcon_class; |
449a2bf5 | 227 | #if defined(CONFIG_ANDROID) |
de55d871 | 228 | static struct class_compat *switch_class; |
449a2bf5 | 229 | #endif /* CONFIG_ANDROID */ |
de55d871 | 230 | |
74c5d09b DK |
231 | static LIST_HEAD(extcon_dev_list); |
232 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
233 | ||
bde68e60 MH |
234 | /** |
235 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
a75e1c73 | 236 | * condition. |
bde68e60 MH |
237 | * @edev: the extcon device |
238 | * @new_state: new cable attach status for @edev | |
239 | * | |
240 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
241 | * violated condition. | |
242 | */ | |
243 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
244 | { | |
245 | int i = 0; | |
246 | ||
247 | if (!edev->mutually_exclusive) | |
248 | return 0; | |
249 | ||
250 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 251 | int weight; |
bde68e60 | 252 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 253 | |
28c0ada6 | 254 | /* calculate the total number of bits set */ |
255 | weight = hweight32(correspondants); | |
256 | if (weight > 1) | |
257 | return i + 1; | |
bde68e60 MH |
258 | } |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
73b6ecdb | 263 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
2a9de9c0 CC |
264 | { |
265 | int i; | |
266 | ||
267 | /* Find the the index of extcon cable in edev->supported_cable */ | |
268 | for (i = 0; i < edev->max_supported; i++) { | |
269 | if (edev->supported_cable[i] == id) | |
270 | return i; | |
271 | } | |
272 | ||
273 | return -EINVAL; | |
274 | } | |
275 | ||
792e7e9e CC |
276 | static int get_extcon_type(unsigned int prop) |
277 | { | |
278 | switch (prop) { | |
279 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
280 | return EXTCON_TYPE_USB; | |
281 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
282 | return EXTCON_TYPE_CHG; | |
283 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
284 | return EXTCON_TYPE_JACK; | |
285 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
286 | return EXTCON_TYPE_DISP; | |
287 | default: | |
288 | return -EINVAL; | |
289 | } | |
290 | } | |
291 | ||
292 | static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index) | |
293 | { | |
294 | return !!(edev->state & BIT(index)); | |
295 | } | |
296 | ||
ab11af04 CC |
297 | static bool is_extcon_changed(struct extcon_dev *edev, int index, |
298 | bool new_state) | |
046050f6 | 299 | { |
ab11af04 CC |
300 | int state = !!(edev->state & BIT(index)); |
301 | return (state != new_state); | |
046050f6 CC |
302 | } |
303 | ||
792e7e9e CC |
304 | static bool is_extcon_property_supported(unsigned int id, unsigned int prop) |
305 | { | |
306 | int type; | |
307 | ||
308 | /* Check whether the property is supported or not. */ | |
309 | type = get_extcon_type(prop); | |
310 | if (type < 0) | |
311 | return false; | |
312 | ||
313 | /* Check whether a specific extcon id supports the property or not. */ | |
314 | return !!(extcon_info[id].type & type); | |
315 | } | |
316 | ||
7f2a0a16 CC |
317 | static int is_extcon_property_capability(struct extcon_dev *edev, |
318 | unsigned int id, int index,unsigned int prop) | |
319 | { | |
320 | struct extcon_cable *cable; | |
321 | int type, ret; | |
322 | ||
323 | /* Check whether the property is supported or not. */ | |
324 | type = get_extcon_type(prop); | |
325 | if (type < 0) | |
326 | return type; | |
327 | ||
328 | cable = &edev->cables[index]; | |
329 | ||
330 | switch (type) { | |
331 | case EXTCON_TYPE_USB: | |
332 | ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
333 | break; | |
334 | case EXTCON_TYPE_CHG: | |
335 | ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
336 | break; | |
337 | case EXTCON_TYPE_JACK: | |
338 | ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
339 | break; | |
340 | case EXTCON_TYPE_DISP: | |
341 | ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
342 | break; | |
343 | default: | |
344 | ret = -EINVAL; | |
345 | } | |
346 | ||
347 | return ret; | |
348 | } | |
349 | ||
792e7e9e CC |
350 | static void init_property(struct extcon_dev *edev, unsigned int id, int index) |
351 | { | |
352 | unsigned int type = extcon_info[id].type; | |
353 | struct extcon_cable *cable = &edev->cables[index]; | |
354 | ||
355 | if (EXTCON_TYPE_USB & type) | |
356 | memset(cable->usb_propval, 0, sizeof(cable->usb_propval)); | |
357 | if (EXTCON_TYPE_CHG & type) | |
358 | memset(cable->chg_propval, 0, sizeof(cable->chg_propval)); | |
359 | if (EXTCON_TYPE_JACK & type) | |
360 | memset(cable->jack_propval, 0, sizeof(cable->jack_propval)); | |
361 | if (EXTCON_TYPE_DISP & type) | |
362 | memset(cable->disp_propval, 0, sizeof(cable->disp_propval)); | |
363 | } | |
364 | ||
de55d871 MH |
365 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
366 | char *buf) | |
367 | { | |
806d9dd7 | 368 | int i, count = 0; |
cb8bb3a7 | 369 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 370 | |
806d9dd7 MH |
371 | if (edev->max_supported == 0) |
372 | return sprintf(buf, "%u\n", edev->state); | |
373 | ||
2a9de9c0 | 374 | for (i = 0; i < edev->max_supported; i++) { |
806d9dd7 | 375 | count += sprintf(buf + count, "%s=%d\n", |
55e4e2f1 | 376 | extcon_info[edev->supported_cable[i]].name, |
806d9dd7 MH |
377 | !!(edev->state & (1 << i))); |
378 | } | |
379 | ||
380 | return count; | |
381 | } | |
5d5321e9 | 382 | static DEVICE_ATTR_RO(state); |
de55d871 MH |
383 | |
384 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
385 | char *buf) | |
386 | { | |
cb8bb3a7 | 387 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 388 | |
71c3ffa5 | 389 | return sprintf(buf, "%s\n", edev->name); |
de55d871 | 390 | } |
af01da0e | 391 | static DEVICE_ATTR_RO(name); |
de55d871 | 392 | |
806d9dd7 MH |
393 | static ssize_t cable_name_show(struct device *dev, |
394 | struct device_attribute *attr, char *buf) | |
395 | { | |
396 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
397 | attr_name); | |
2a9de9c0 | 398 | int i = cable->cable_index; |
806d9dd7 MH |
399 | |
400 | return sprintf(buf, "%s\n", | |
55e4e2f1 | 401 | extcon_info[cable->edev->supported_cable[i]].name); |
806d9dd7 MH |
402 | } |
403 | ||
404 | static ssize_t cable_state_show(struct device *dev, | |
405 | struct device_attribute *attr, char *buf) | |
406 | { | |
407 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
408 | attr_state); | |
409 | ||
be052cc8 RQ |
410 | int i = cable->cable_index; |
411 | ||
806d9dd7 | 412 | return sprintf(buf, "%d\n", |
575c2b86 | 413 | extcon_get_state(cable->edev, cable->edev->supported_cable[i])); |
806d9dd7 MH |
414 | } |
415 | ||
de55d871 | 416 | /** |
ab11af04 CC |
417 | * extcon_sync() - Synchronize the states for both the attached/detached |
418 | * @edev: the extcon device that has the cable. | |
74c5d09b | 419 | * |
ab11af04 CC |
420 | * This function send a notification to synchronize the all states of a |
421 | * specific external connector | |
de55d871 | 422 | */ |
ab11af04 | 423 | int extcon_sync(struct extcon_dev *edev, unsigned int id) |
de55d871 MH |
424 | { |
425 | char name_buf[120]; | |
426 | char state_buf[120]; | |
427 | char *prop_buf; | |
428 | char *envp[3]; | |
429 | int env_offset = 0; | |
430 | int length; | |
046050f6 | 431 | int index; |
ab11af04 | 432 | int state; |
806d9dd7 | 433 | unsigned long flags; |
de55d871 | 434 | |
7eae43ae CC |
435 | if (!edev) |
436 | return -EINVAL; | |
437 | ||
ab11af04 CC |
438 | index = find_cable_index_by_id(edev, id); |
439 | if (index < 0) | |
440 | return index; | |
441 | ||
806d9dd7 | 442 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 443 | |
ab11af04 CC |
444 | state = !!(edev->state & BIT(index)); |
445 | raw_notifier_call_chain(&edev->nh[index], state, edev); | |
446 | ||
447 | /* This could be in interrupt handler */ | |
448 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
449 | if (!prop_buf) { | |
450 | /* Unlock early before uevent */ | |
806d9dd7 | 451 | spin_unlock_irqrestore(&edev->lock, flags); |
ab11af04 CC |
452 | |
453 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); | |
454 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
455 | ||
5b11ebed | 456 | return -ENOMEM; |
ab11af04 CC |
457 | } |
458 | ||
459 | length = name_show(&edev->dev, NULL, prop_buf); | |
460 | if (length > 0) { | |
461 | if (prop_buf[length - 1] == '\n') | |
462 | prop_buf[length - 1] = 0; | |
463 | snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf); | |
464 | envp[env_offset++] = name_buf; | |
465 | } | |
466 | ||
467 | length = state_show(&edev->dev, NULL, prop_buf); | |
468 | if (length > 0) { | |
469 | if (prop_buf[length - 1] == '\n') | |
470 | prop_buf[length - 1] = 0; | |
471 | snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf); | |
472 | envp[env_offset++] = state_buf; | |
de55d871 | 473 | } |
ab11af04 CC |
474 | envp[env_offset] = NULL; |
475 | ||
476 | /* Unlock early before uevent */ | |
477 | spin_unlock_irqrestore(&edev->lock, flags); | |
478 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); | |
479 | free_page((unsigned long)prop_buf); | |
bde68e60 MH |
480 | |
481 | return 0; | |
de55d871 | 482 | } |
ab11af04 | 483 | EXPORT_SYMBOL_GPL(extcon_sync); |
de55d871 | 484 | |
806d9dd7 | 485 | /** |
575c2b86 | 486 | * extcon_get_state() - Get the state of a external connector. |
806d9dd7 | 487 | * @edev: the extcon device that has the cable. |
2a9de9c0 | 488 | * @id: the unique id of each external connector in extcon enumeration. |
806d9dd7 | 489 | */ |
575c2b86 | 490 | int extcon_get_state(struct extcon_dev *edev, const unsigned int id) |
806d9dd7 | 491 | { |
575c2b86 CC |
492 | int index, state; |
493 | unsigned long flags; | |
806d9dd7 | 494 | |
7eae43ae CC |
495 | if (!edev) |
496 | return -EINVAL; | |
497 | ||
2a9de9c0 CC |
498 | index = find_cable_index_by_id(edev, id); |
499 | if (index < 0) | |
500 | return index; | |
806d9dd7 | 501 | |
575c2b86 CC |
502 | spin_lock_irqsave(&edev->lock, flags); |
503 | state = is_extcon_attached(edev, index); | |
504 | spin_unlock_irqrestore(&edev->lock, flags); | |
806d9dd7 | 505 | |
575c2b86 | 506 | return state; |
806d9dd7 | 507 | } |
575c2b86 | 508 | EXPORT_SYMBOL_GPL(extcon_get_state); |
806d9dd7 | 509 | |
806d9dd7 | 510 | /** |
575c2b86 | 511 | * extcon_set_state() - Set the state of a external connector. |
ab11af04 | 512 | * without a notification. |
a75e1c73 | 513 | * @edev: the extcon device that has the cable. |
2a9de9c0 CC |
514 | * @id: the unique id of each external connector |
515 | * in extcon enumeration. | |
516 | * @state: the new cable status. The default semantics is | |
806d9dd7 | 517 | * true: attached / false: detached. |
ab11af04 CC |
518 | * |
519 | * This function only set the state of a external connector without | |
520 | * a notification. To synchronize the data of a external connector, | |
521 | * use extcon_set_state_sync() and extcon_sync(). | |
806d9dd7 | 522 | */ |
575c2b86 | 523 | int extcon_set_state(struct extcon_dev *edev, unsigned int id, |
2a9de9c0 | 524 | bool cable_state) |
806d9dd7 | 525 | { |
ab11af04 CC |
526 | unsigned long flags; |
527 | int index, ret = 0; | |
806d9dd7 | 528 | |
7eae43ae CC |
529 | if (!edev) |
530 | return -EINVAL; | |
531 | ||
2a9de9c0 CC |
532 | index = find_cable_index_by_id(edev, id); |
533 | if (index < 0) | |
534 | return index; | |
535 | ||
ab11af04 CC |
536 | spin_lock_irqsave(&edev->lock, flags); |
537 | ||
538 | /* Check whether the external connector's state is changed. */ | |
539 | if (!is_extcon_changed(edev, index, cable_state)) | |
540 | goto out; | |
541 | ||
542 | if (check_mutually_exclusive(edev, | |
543 | (edev->state & ~BIT(index)) | (cable_state & BIT(index)))) { | |
544 | ret = -EPERM; | |
545 | goto out; | |
546 | } | |
547 | ||
792e7e9e CC |
548 | /* |
549 | * Initialize the value of extcon property before setting | |
550 | * the detached state for an external connector. | |
551 | */ | |
552 | if (!cable_state) | |
553 | init_property(edev, id, index); | |
554 | ||
ab11af04 CC |
555 | /* Update the state for a external connector. */ |
556 | if (cable_state) | |
557 | edev->state |= BIT(index); | |
558 | else | |
559 | edev->state &= ~(BIT(index)); | |
560 | out: | |
561 | spin_unlock_irqrestore(&edev->lock, flags); | |
562 | ||
563 | return ret; | |
806d9dd7 | 564 | } |
575c2b86 | 565 | EXPORT_SYMBOL_GPL(extcon_set_state); |
806d9dd7 | 566 | |
ab11af04 CC |
567 | /** |
568 | * extcon_set_state_sync() - Set the state of a external connector | |
569 | * with a notification. | |
570 | * @edev: the extcon device that has the cable. | |
571 | * @id: the unique id of each external connector | |
572 | * in extcon enumeration. | |
573 | * @state: the new cable status. The default semantics is | |
574 | * true: attached / false: detached. | |
575 | * | |
576 | * This function set the state of external connector and synchronize the data | |
577 | * by usning a notification. | |
578 | */ | |
579 | int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, | |
580 | bool cable_state) | |
581 | { | |
582 | int ret, index; | |
583 | unsigned long flags; | |
584 | ||
585 | index = find_cable_index_by_id(edev, id); | |
586 | if (index < 0) | |
587 | return index; | |
588 | ||
589 | /* Check whether the external connector's state is changed. */ | |
590 | spin_lock_irqsave(&edev->lock, flags); | |
591 | ret = is_extcon_changed(edev, index, cable_state); | |
592 | spin_unlock_irqrestore(&edev->lock, flags); | |
593 | if (!ret) | |
594 | return 0; | |
595 | ||
596 | ret = extcon_set_state(edev, id, cable_state); | |
597 | if (ret < 0) | |
598 | return ret; | |
599 | ||
600 | return extcon_sync(edev, id); | |
601 | } | |
602 | EXPORT_SYMBOL_GPL(extcon_set_state_sync); | |
603 | ||
792e7e9e CC |
604 | /** |
605 | * extcon_get_property() - Get the property value of a specific cable. | |
606 | * @edev: the extcon device that has the cable. | |
607 | * @id: the unique id of each external connector | |
608 | * in extcon enumeration. | |
609 | * @prop: the property id among enum extcon_property. | |
610 | * @prop_val: the pointer which store the value of property. | |
611 | * | |
612 | * When getting the property value of external connector, the external connector | |
613 | * should be attached. If detached state, function just return 0 without | |
614 | * property value. Also, the each property should be included in the list of | |
615 | * supported properties according to the type of external connectors. | |
616 | * | |
617 | * Returns 0 if success or error number if fail | |
618 | */ | |
619 | int extcon_get_property(struct extcon_dev *edev, unsigned int id, | |
620 | unsigned int prop, | |
621 | union extcon_property_value *prop_val) | |
622 | { | |
623 | struct extcon_cable *cable; | |
624 | unsigned long flags; | |
625 | int index, ret = 0; | |
626 | ||
627 | *prop_val = (union extcon_property_value)(0); | |
628 | ||
629 | if (!edev) | |
630 | return -EINVAL; | |
631 | ||
632 | /* Check whether the property is supported or not */ | |
633 | if (!is_extcon_property_supported(id, prop)) | |
634 | return -EINVAL; | |
635 | ||
636 | /* Find the cable index of external connector by using id */ | |
637 | index = find_cable_index_by_id(edev, id); | |
638 | if (index < 0) | |
639 | return index; | |
640 | ||
641 | spin_lock_irqsave(&edev->lock, flags); | |
642 | ||
7f2a0a16 CC |
643 | /* Check whether the property is available or not. */ |
644 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
645 | spin_unlock_irqrestore(&edev->lock, flags); | |
646 | return -EPERM; | |
647 | } | |
648 | ||
792e7e9e CC |
649 | /* |
650 | * Check whether the external connector is attached. | |
651 | * If external connector is detached, the user can not | |
652 | * get the property value. | |
653 | */ | |
654 | if (!is_extcon_attached(edev, index)) { | |
655 | spin_unlock_irqrestore(&edev->lock, flags); | |
656 | return 0; | |
657 | } | |
658 | ||
659 | cable = &edev->cables[index]; | |
660 | ||
661 | /* Get the property value according to extcon type */ | |
662 | switch (prop) { | |
663 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
664 | *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN]; | |
665 | break; | |
666 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
667 | *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN]; | |
668 | break; | |
669 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
670 | *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN]; | |
671 | break; | |
672 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
673 | *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN]; | |
674 | break; | |
675 | default: | |
676 | ret = -EINVAL; | |
677 | break; | |
678 | } | |
679 | ||
680 | spin_unlock_irqrestore(&edev->lock, flags); | |
681 | ||
682 | return ret; | |
683 | } | |
684 | EXPORT_SYMBOL_GPL(extcon_get_property); | |
685 | ||
686 | /** | |
687 | * extcon_set_property() - Set the property value of a specific cable. | |
688 | * @edev: the extcon device that has the cable. | |
689 | * @id: the unique id of each external connector | |
690 | * in extcon enumeration. | |
691 | * @prop: the property id among enum extcon_property. | |
692 | * @prop_val: the pointer including the new value of property. | |
693 | * | |
694 | * The each property should be included in the list of supported properties | |
695 | * according to the type of external connectors. | |
696 | * | |
697 | * Returns 0 if success or error number if fail | |
698 | */ | |
699 | int extcon_set_property(struct extcon_dev *edev, unsigned int id, | |
700 | unsigned int prop, | |
701 | union extcon_property_value prop_val) | |
702 | { | |
703 | struct extcon_cable *cable; | |
704 | unsigned long flags; | |
705 | int index, ret = 0; | |
706 | ||
707 | if (!edev) | |
708 | return -EINVAL; | |
709 | ||
710 | /* Check whether the property is supported or not */ | |
711 | if (!is_extcon_property_supported(id, prop)) | |
712 | return -EINVAL; | |
713 | ||
714 | /* Find the cable index of external connector by using id */ | |
715 | index = find_cable_index_by_id(edev, id); | |
716 | if (index < 0) | |
717 | return index; | |
718 | ||
719 | spin_lock_irqsave(&edev->lock, flags); | |
720 | ||
7f2a0a16 CC |
721 | /* Check whether the property is available or not. */ |
722 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
723 | spin_unlock_irqrestore(&edev->lock, flags); | |
724 | return -EPERM; | |
725 | } | |
726 | ||
792e7e9e CC |
727 | cable = &edev->cables[index]; |
728 | ||
729 | /* Set the property value according to extcon type */ | |
730 | switch (prop) { | |
731 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
732 | cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val; | |
733 | break; | |
734 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
735 | cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val; | |
736 | break; | |
737 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
738 | cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val; | |
739 | break; | |
740 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
741 | cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val; | |
742 | break; | |
743 | default: | |
744 | ret = -EINVAL; | |
745 | break; | |
746 | } | |
747 | ||
748 | spin_unlock_irqrestore(&edev->lock, flags); | |
749 | ||
750 | return ret; | |
751 | } | |
752 | EXPORT_SYMBOL_GPL(extcon_set_property); | |
753 | ||
ab11af04 CC |
754 | /** |
755 | * extcon_set_property_sync() - Set the property value of a specific cable | |
756 | with a notification. | |
757 | * @prop_val: the pointer including the new value of property. | |
758 | * | |
759 | * When setting the property value of external connector, the external connector | |
760 | * should be attached. The each property should be included in the list of | |
761 | * supported properties according to the type of external connectors. | |
762 | * | |
763 | * Returns 0 if success or error number if fail | |
764 | */ | |
765 | int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id, | |
766 | unsigned int prop, | |
767 | union extcon_property_value prop_val) | |
768 | { | |
769 | int ret; | |
770 | ||
771 | ret = extcon_set_property(edev, id, prop, prop_val); | |
772 | if (ret < 0) | |
773 | return ret; | |
774 | ||
775 | return extcon_sync(edev, id); | |
776 | } | |
777 | EXPORT_SYMBOL_GPL(extcon_set_property_sync); | |
778 | ||
7f2a0a16 CC |
779 | /** |
780 | * extcon_get_property_capability() - Get the capability of property | |
781 | * of an external connector. | |
782 | * @edev: the extcon device that has the cable. | |
783 | * @id: the unique id of each external connector | |
784 | * in extcon enumeration. | |
785 | * @prop: the property id among enum extcon_property. | |
786 | * | |
787 | * Returns 1 if the property is available or 0 if not available. | |
788 | */ | |
789 | int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id, | |
790 | unsigned int prop) | |
791 | { | |
792 | int index; | |
793 | ||
794 | if (!edev) | |
795 | return -EINVAL; | |
796 | ||
797 | /* Check whether the property is supported or not */ | |
798 | if (!is_extcon_property_supported(id, prop)) | |
799 | return -EINVAL; | |
800 | ||
801 | /* Find the cable index of external connector by using id */ | |
802 | index = find_cable_index_by_id(edev, id); | |
803 | if (index < 0) | |
804 | return index; | |
805 | ||
806 | return is_extcon_property_capability(edev, id, index, prop); | |
807 | } | |
808 | EXPORT_SYMBOL_GPL(extcon_get_property_capability); | |
809 | ||
810 | /** | |
811 | * extcon_set_property_capability() - Set the capability of a property | |
812 | * of an external connector. | |
813 | * @edev: the extcon device that has the cable. | |
814 | * @id: the unique id of each external connector | |
815 | * in extcon enumeration. | |
816 | * @prop: the property id among enum extcon_property. | |
817 | * | |
818 | * This function set the capability of a property for an external connector | |
819 | * to mark the bit in capability bitmap which mean the available state of | |
820 | * a property. | |
821 | * | |
822 | * Returns 0 if success or error number if fail | |
823 | */ | |
824 | int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id, | |
825 | unsigned int prop) | |
826 | { | |
827 | struct extcon_cable *cable; | |
828 | int index, type, ret = 0; | |
829 | ||
830 | if (!edev) | |
831 | return -EINVAL; | |
832 | ||
833 | /* Check whether the property is supported or not. */ | |
834 | if (!is_extcon_property_supported(id, prop)) | |
835 | return -EINVAL; | |
836 | ||
837 | /* Find the cable index of external connector by using id. */ | |
838 | index = find_cable_index_by_id(edev, id); | |
839 | if (index < 0) | |
840 | return index; | |
841 | ||
842 | type = get_extcon_type(prop); | |
843 | if (type < 0) | |
844 | return type; | |
845 | ||
846 | cable = &edev->cables[index]; | |
847 | ||
848 | switch (type) { | |
849 | case EXTCON_TYPE_USB: | |
850 | __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
851 | break; | |
852 | case EXTCON_TYPE_CHG: | |
853 | __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
854 | break; | |
855 | case EXTCON_TYPE_JACK: | |
856 | __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
857 | break; | |
858 | case EXTCON_TYPE_DISP: | |
859 | __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
860 | break; | |
861 | default: | |
862 | ret = -EINVAL; | |
863 | } | |
864 | ||
865 | return ret; | |
866 | } | |
867 | EXPORT_SYMBOL_GPL(extcon_set_property_capability); | |
868 | ||
74c5d09b DK |
869 | /** |
870 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
871 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
872 | */ | |
873 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
874 | { | |
875 | struct extcon_dev *sd; | |
876 | ||
7eae43ae CC |
877 | if (!extcon_name) |
878 | return ERR_PTR(-EINVAL); | |
879 | ||
74c5d09b DK |
880 | mutex_lock(&extcon_dev_list_lock); |
881 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
882 | if (!strcmp(sd->name, extcon_name)) | |
883 | goto out; | |
884 | } | |
885 | sd = NULL; | |
886 | out: | |
887 | mutex_unlock(&extcon_dev_list_lock); | |
888 | return sd; | |
889 | } | |
890 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
891 | ||
892 | /** | |
c338bb03 | 893 | * extcon_register_notifier() - Register a notifiee to get notified by |
a75e1c73 | 894 | * any attach status changes from the extcon. |
046050f6 CC |
895 | * @edev: the extcon device that has the external connecotr. |
896 | * @id: the unique id of each external connector in extcon enumeration. | |
74c5d09b | 897 | * @nb: a notifier block to be registered. |
806d9dd7 MH |
898 | * |
899 | * Note that the second parameter given to the callback of nb (val) is | |
900 | * "old_state", not the current state. The current state can be retrieved | |
901 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b | 902 | */ |
73b6ecdb | 903 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 904 | struct notifier_block *nb) |
74c5d09b | 905 | { |
66bee35f | 906 | unsigned long flags; |
2c8116a1 | 907 | int ret, idx = -EINVAL; |
046050f6 | 908 | |
830ae442 | 909 | if (!nb) |
7eae43ae CC |
910 | return -EINVAL; |
911 | ||
830ae442 CC |
912 | if (edev) { |
913 | idx = find_cable_index_by_id(edev, id); | |
a05f44c8 SB |
914 | if (idx < 0) |
915 | return idx; | |
66bee35f | 916 | |
830ae442 CC |
917 | spin_lock_irqsave(&edev->lock, flags); |
918 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); | |
919 | spin_unlock_irqrestore(&edev->lock, flags); | |
920 | } else { | |
921 | struct extcon_dev *extd; | |
922 | ||
923 | mutex_lock(&extcon_dev_list_lock); | |
924 | list_for_each_entry(extd, &extcon_dev_list, entry) { | |
925 | idx = find_cable_index_by_id(extd, id); | |
926 | if (idx >= 0) | |
927 | break; | |
928 | } | |
929 | mutex_unlock(&extcon_dev_list_lock); | |
930 | ||
931 | if (idx >= 0) { | |
932 | edev = extd; | |
933 | return extcon_register_notifier(extd, id, nb); | |
934 | } else { | |
935 | ret = -ENODEV; | |
936 | } | |
937 | } | |
66bee35f HG |
938 | |
939 | return ret; | |
74c5d09b DK |
940 | } |
941 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
942 | ||
943 | /** | |
c338bb03 | 944 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
046050f6 CC |
945 | * @edev: the extcon device that has the external connecotr. |
946 | * @id: the unique id of each external connector in extcon enumeration. | |
947 | * @nb: a notifier block to be registered. | |
74c5d09b | 948 | */ |
73b6ecdb | 949 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 950 | struct notifier_block *nb) |
74c5d09b | 951 | { |
66bee35f | 952 | unsigned long flags; |
046050f6 CC |
953 | int ret, idx; |
954 | ||
7eae43ae CC |
955 | if (!edev || !nb) |
956 | return -EINVAL; | |
957 | ||
046050f6 | 958 | idx = find_cable_index_by_id(edev, id); |
a05f44c8 SB |
959 | if (idx < 0) |
960 | return idx; | |
66bee35f HG |
961 | |
962 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 963 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
66bee35f HG |
964 | spin_unlock_irqrestore(&edev->lock, flags); |
965 | ||
966 | return ret; | |
74c5d09b DK |
967 | } |
968 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
969 | ||
af01da0e GKH |
970 | static struct attribute *extcon_attrs[] = { |
971 | &dev_attr_state.attr, | |
972 | &dev_attr_name.attr, | |
973 | NULL, | |
de55d871 | 974 | }; |
af01da0e | 975 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
976 | |
977 | static int create_extcon_class(void) | |
978 | { | |
979 | if (!extcon_class) { | |
980 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
981 | if (IS_ERR(extcon_class)) | |
982 | return PTR_ERR(extcon_class); | |
af01da0e | 983 | extcon_class->dev_groups = extcon_groups; |
de55d871 | 984 | |
449a2bf5 | 985 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
986 | switch_class = class_compat_register("switch"); |
987 | if (WARN(!switch_class, "cannot allocate")) | |
988 | return -ENOMEM; | |
449a2bf5 | 989 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
990 | } |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
de55d871 MH |
995 | static void extcon_dev_release(struct device *dev) |
996 | { | |
de55d871 MH |
997 | } |
998 | ||
bde68e60 | 999 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
1000 | static void dummy_sysfs_dev_release(struct device *dev) |
1001 | { | |
1002 | } | |
1003 | ||
a9af6522 CC |
1004 | /* |
1005 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
2a9de9c0 | 1006 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
a9af6522 CC |
1007 | * If supported_cable is NULL, cable name related APIs |
1008 | * are disabled. | |
1009 | * | |
1010 | * This function allocates the memory for extcon device without allocating | |
1011 | * memory in each extcon provider driver and initialize default setting for | |
1012 | * extcon device. | |
1013 | * | |
1014 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail | |
1015 | */ | |
73b6ecdb | 1016 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
a9af6522 CC |
1017 | { |
1018 | struct extcon_dev *edev; | |
1019 | ||
7eae43ae CC |
1020 | if (!supported_cable) |
1021 | return ERR_PTR(-EINVAL); | |
1022 | ||
a9af6522 CC |
1023 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
1024 | if (!edev) | |
1025 | return ERR_PTR(-ENOMEM); | |
1026 | ||
1027 | edev->max_supported = 0; | |
1028 | edev->supported_cable = supported_cable; | |
1029 | ||
1030 | return edev; | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * extcon_dev_free() - Free the memory of extcon device. | |
1035 | * @edev: the extcon device to free | |
1036 | */ | |
1037 | void extcon_dev_free(struct extcon_dev *edev) | |
1038 | { | |
1039 | kfree(edev); | |
1040 | } | |
1041 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
1042 | ||
de55d871 MH |
1043 | /** |
1044 | * extcon_dev_register() - Register a new extcon device | |
1045 | * @edev : the new extcon device (should be allocated before calling) | |
de55d871 MH |
1046 | * |
1047 | * Among the members of edev struct, please set the "user initializing data" | |
1048 | * in any case and set the "optional callbacks" if required. However, please | |
1049 | * do not set the values of "internal data", which are initialized by | |
1050 | * this function. | |
1051 | */ | |
42d7d753 | 1052 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 1053 | { |
806d9dd7 | 1054 | int ret, index = 0; |
71c3ffa5 | 1055 | static atomic_t edev_no = ATOMIC_INIT(-1); |
de55d871 MH |
1056 | |
1057 | if (!extcon_class) { | |
1058 | ret = create_extcon_class(); | |
1059 | if (ret < 0) | |
1060 | return ret; | |
1061 | } | |
1062 | ||
7eae43ae | 1063 | if (!edev || !edev->supported_cable) |
2a9de9c0 CC |
1064 | return -EINVAL; |
1065 | ||
1066 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); | |
806d9dd7 | 1067 | |
2a9de9c0 | 1068 | edev->max_supported = index; |
806d9dd7 | 1069 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
1070 | dev_err(&edev->dev, |
1071 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
1072 | return -EINVAL; |
1073 | } | |
1074 | ||
dae61651 CC |
1075 | edev->dev.class = extcon_class; |
1076 | edev->dev.release = extcon_dev_release; | |
de55d871 | 1077 | |
71c3ffa5 | 1078 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
1079 | if (IS_ERR_OR_NULL(edev->name)) { |
1080 | dev_err(&edev->dev, | |
1081 | "extcon device name is null\n"); | |
1082 | return -EINVAL; | |
1083 | } | |
71c3ffa5 CC |
1084 | dev_set_name(&edev->dev, "extcon%lu", |
1085 | (unsigned long)atomic_inc_return(&edev_no)); | |
806d9dd7 MH |
1086 | |
1087 | if (edev->max_supported) { | |
1088 | char buf[10]; | |
1089 | char *str; | |
1090 | struct extcon_cable *cable; | |
1091 | ||
1092 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
1093 | edev->max_supported, GFP_KERNEL); | |
1094 | if (!edev->cables) { | |
1095 | ret = -ENOMEM; | |
1096 | goto err_sysfs_alloc; | |
1097 | } | |
1098 | for (index = 0; index < edev->max_supported; index++) { | |
1099 | cable = &edev->cables[index]; | |
1100 | ||
1101 | snprintf(buf, 10, "cable.%d", index); | |
1102 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
1103 | GFP_KERNEL); | |
1104 | if (!str) { | |
1105 | for (index--; index >= 0; index--) { | |
1106 | cable = &edev->cables[index]; | |
1107 | kfree(cable->attr_g.name); | |
1108 | } | |
1109 | ret = -ENOMEM; | |
1110 | ||
1111 | goto err_alloc_cables; | |
1112 | } | |
1113 | strcpy(str, buf); | |
1114 | ||
1115 | cable->edev = edev; | |
1116 | cable->cable_index = index; | |
1117 | cable->attrs[0] = &cable->attr_name.attr; | |
1118 | cable->attrs[1] = &cable->attr_state.attr; | |
1119 | cable->attrs[2] = NULL; | |
1120 | cable->attr_g.name = str; | |
1121 | cable->attr_g.attrs = cable->attrs; | |
1122 | ||
9baf3220 | 1123 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
1124 | cable->attr_name.attr.name = "name"; |
1125 | cable->attr_name.attr.mode = 0444; | |
1126 | cable->attr_name.show = cable_name_show; | |
1127 | ||
9baf3220 | 1128 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 1129 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 1130 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 1131 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
1132 | } |
1133 | } | |
1134 | ||
bde68e60 MH |
1135 | if (edev->max_supported && edev->mutually_exclusive) { |
1136 | char buf[80]; | |
1137 | char *name; | |
1138 | ||
1139 | /* Count the size of mutually_exclusive array */ | |
1140 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1141 | ; | |
1142 | ||
1143 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
1144 | (index + 1), GFP_KERNEL); | |
1145 | if (!edev->attrs_muex) { | |
1146 | ret = -ENOMEM; | |
1147 | goto err_muex; | |
1148 | } | |
1149 | ||
1150 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
1151 | index, GFP_KERNEL); | |
1152 | if (!edev->d_attrs_muex) { | |
1153 | ret = -ENOMEM; | |
1154 | kfree(edev->attrs_muex); | |
1155 | goto err_muex; | |
1156 | } | |
1157 | ||
1158 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
1159 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
1160 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
1161 | GFP_KERNEL); | |
1162 | if (!name) { | |
1163 | for (index--; index >= 0; index--) { | |
1164 | kfree(edev->d_attrs_muex[index].attr. | |
1165 | name); | |
1166 | } | |
1167 | kfree(edev->d_attrs_muex); | |
1168 | kfree(edev->attrs_muex); | |
1169 | ret = -ENOMEM; | |
1170 | goto err_muex; | |
1171 | } | |
1172 | strcpy(name, buf); | |
9baf3220 | 1173 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
1174 | edev->d_attrs_muex[index].attr.name = name; |
1175 | edev->d_attrs_muex[index].attr.mode = 0000; | |
1176 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
1177 | .attr; | |
1178 | } | |
1179 | edev->attr_g_muex.name = muex_name; | |
1180 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
1181 | ||
1182 | } | |
1183 | ||
806d9dd7 MH |
1184 | if (edev->max_supported) { |
1185 | edev->extcon_dev_type.groups = | |
1186 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 1187 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
1188 | if (!edev->extcon_dev_type.groups) { |
1189 | ret = -ENOMEM; | |
1190 | goto err_alloc_groups; | |
1191 | } | |
1192 | ||
dae61651 | 1193 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
1194 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
1195 | ||
1196 | for (index = 0; index < edev->max_supported; index++) | |
1197 | edev->extcon_dev_type.groups[index] = | |
1198 | &edev->cables[index].attr_g; | |
bde68e60 MH |
1199 | if (edev->mutually_exclusive) |
1200 | edev->extcon_dev_type.groups[index] = | |
1201 | &edev->attr_g_muex; | |
806d9dd7 | 1202 | |
dae61651 | 1203 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
1204 | } |
1205 | ||
dae61651 | 1206 | ret = device_register(&edev->dev); |
de55d871 | 1207 | if (ret) { |
dae61651 | 1208 | put_device(&edev->dev); |
de55d871 MH |
1209 | goto err_dev; |
1210 | } | |
449a2bf5 | 1211 | #if defined(CONFIG_ANDROID) |
de55d871 | 1212 | if (switch_class) |
dae61651 | 1213 | ret = class_compat_create_link(switch_class, &edev->dev, NULL); |
449a2bf5 | 1214 | #endif /* CONFIG_ANDROID */ |
de55d871 | 1215 | |
806d9dd7 MH |
1216 | spin_lock_init(&edev->lock); |
1217 | ||
046050f6 CC |
1218 | edev->nh = devm_kzalloc(&edev->dev, |
1219 | sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL); | |
1220 | if (!edev->nh) { | |
1221 | ret = -ENOMEM; | |
1222 | goto err_dev; | |
1223 | } | |
1224 | ||
1225 | for (index = 0; index < edev->max_supported; index++) | |
1226 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); | |
74c5d09b | 1227 | |
dae61651 | 1228 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 1229 | edev->state = 0; |
74c5d09b DK |
1230 | |
1231 | mutex_lock(&extcon_dev_list_lock); | |
1232 | list_add(&edev->entry, &extcon_dev_list); | |
1233 | mutex_unlock(&extcon_dev_list_lock); | |
1234 | ||
de55d871 MH |
1235 | return 0; |
1236 | ||
1237 | err_dev: | |
806d9dd7 MH |
1238 | if (edev->max_supported) |
1239 | kfree(edev->extcon_dev_type.groups); | |
1240 | err_alloc_groups: | |
bde68e60 MH |
1241 | if (edev->max_supported && edev->mutually_exclusive) { |
1242 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1243 | kfree(edev->d_attrs_muex[index].attr.name); | |
1244 | kfree(edev->d_attrs_muex); | |
1245 | kfree(edev->attrs_muex); | |
1246 | } | |
1247 | err_muex: | |
806d9dd7 MH |
1248 | for (index = 0; index < edev->max_supported; index++) |
1249 | kfree(edev->cables[index].attr_g.name); | |
1250 | err_alloc_cables: | |
1251 | if (edev->max_supported) | |
1252 | kfree(edev->cables); | |
1253 | err_sysfs_alloc: | |
de55d871 MH |
1254 | return ret; |
1255 | } | |
1256 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
1257 | ||
1258 | /** | |
1259 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 1260 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
1261 | * |
1262 | * Note that this does not call kfree(edev) because edev was not allocated | |
1263 | * by this class. | |
1264 | */ | |
1265 | void extcon_dev_unregister(struct extcon_dev *edev) | |
1266 | { | |
57e7cd37 | 1267 | int index; |
1268 | ||
7eae43ae CC |
1269 | if (!edev) |
1270 | return; | |
1271 | ||
57e7cd37 | 1272 | mutex_lock(&extcon_dev_list_lock); |
1273 | list_del(&edev->entry); | |
1274 | mutex_unlock(&extcon_dev_list_lock); | |
1275 | ||
dae61651 CC |
1276 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
1277 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
1278 | dev_name(&edev->dev)); | |
57e7cd37 | 1279 | return; |
1280 | } | |
1281 | ||
7585ca0d WX |
1282 | device_unregister(&edev->dev); |
1283 | ||
57e7cd37 | 1284 | if (edev->mutually_exclusive && edev->max_supported) { |
1285 | for (index = 0; edev->mutually_exclusive[index]; | |
1286 | index++) | |
1287 | kfree(edev->d_attrs_muex[index].attr.name); | |
1288 | kfree(edev->d_attrs_muex); | |
1289 | kfree(edev->attrs_muex); | |
1290 | } | |
1291 | ||
1292 | for (index = 0; index < edev->max_supported; index++) | |
1293 | kfree(edev->cables[index].attr_g.name); | |
1294 | ||
1295 | if (edev->max_supported) { | |
1296 | kfree(edev->extcon_dev_type.groups); | |
1297 | kfree(edev->cables); | |
1298 | } | |
1299 | ||
1300 | #if defined(CONFIG_ANDROID) | |
1301 | if (switch_class) | |
dae61651 | 1302 | class_compat_remove_link(switch_class, &edev->dev, NULL); |
57e7cd37 | 1303 | #endif |
dae61651 | 1304 | put_device(&edev->dev); |
de55d871 MH |
1305 | } |
1306 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
1307 | ||
1ad94ffe CC |
1308 | #ifdef CONFIG_OF |
1309 | /* | |
1310 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree | |
1311 | * @dev - instance to the given device | |
1312 | * @index - index into list of extcon_dev | |
1313 | * | |
1314 | * return the instance of extcon device | |
1315 | */ | |
1316 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1317 | { | |
1318 | struct device_node *node; | |
1319 | struct extcon_dev *edev; | |
1320 | ||
7eae43ae CC |
1321 | if (!dev) |
1322 | return ERR_PTR(-EINVAL); | |
1323 | ||
1ad94ffe | 1324 | if (!dev->of_node) { |
e8752b7a | 1325 | dev_dbg(dev, "device does not have a device node entry\n"); |
1ad94ffe CC |
1326 | return ERR_PTR(-EINVAL); |
1327 | } | |
1328 | ||
1329 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
1330 | if (!node) { | |
e8752b7a | 1331 | dev_dbg(dev, "failed to get phandle in %s node\n", |
1ad94ffe CC |
1332 | dev->of_node->full_name); |
1333 | return ERR_PTR(-ENODEV); | |
1334 | } | |
1335 | ||
f841afb1 TF |
1336 | mutex_lock(&extcon_dev_list_lock); |
1337 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
1338 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
1339 | mutex_unlock(&extcon_dev_list_lock); | |
5d5c4c13 | 1340 | of_node_put(node); |
f841afb1 TF |
1341 | return edev; |
1342 | } | |
1ad94ffe | 1343 | } |
f841afb1 | 1344 | mutex_unlock(&extcon_dev_list_lock); |
5d5c4c13 | 1345 | of_node_put(node); |
1ad94ffe | 1346 | |
f841afb1 | 1347 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
1348 | } |
1349 | #else | |
1350 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1351 | { | |
1352 | return ERR_PTR(-ENOSYS); | |
1353 | } | |
1354 | #endif /* CONFIG_OF */ | |
1355 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
1356 | ||
707d7550 CC |
1357 | /** |
1358 | * extcon_get_edev_name() - Get the name of the extcon device. | |
1359 | * @edev: the extcon device | |
1360 | */ | |
1361 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
1362 | { | |
1363 | return !edev ? NULL : edev->name; | |
1364 | } | |
1365 | ||
de55d871 MH |
1366 | static int __init extcon_class_init(void) |
1367 | { | |
1368 | return create_extcon_class(); | |
1369 | } | |
1370 | module_init(extcon_class_init); | |
1371 | ||
1372 | static void __exit extcon_class_exit(void) | |
1373 | { | |
0dc77b6d PH |
1374 | #if defined(CONFIG_ANDROID) |
1375 | class_compat_unregister(switch_class); | |
1376 | #endif | |
de55d871 MH |
1377 | class_destroy(extcon_class); |
1378 | } | |
1379 | module_exit(extcon_class_exit); | |
1380 | ||
2a9de9c0 | 1381 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 MH |
1382 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); |
1383 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
1384 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
1385 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
1386 | MODULE_LICENSE("GPL"); |