Commit | Line | Data |
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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
de55d871 | 2 | /* |
6ab6094f | 3 | * drivers/extcon/extcon.c - External Connector (extcon) framework. |
de55d871 | 4 | * |
2a9de9c0 CC |
5 | * Copyright (C) 2015 Samsung Electronics |
6 | * Author: Chanwoo Choi <cw00.choi@samsung.com> | |
7 | * | |
de55d871 MH |
8 | * Copyright (C) 2012 Samsung Electronics |
9 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
10 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
11 | * | |
12 | * based on android/drivers/switch/switch_class.c | |
13 | * Copyright (C) 2008 Google, Inc. | |
14 | * Author: Mike Lockwood <lockwood@android.com> | |
b9ec23c0 | 15 | */ |
de55d871 MH |
16 | |
17 | #include <linux/module.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/err.h> | |
f841afb1 | 23 | #include <linux/of.h> |
de55d871 | 24 | #include <linux/slab.h> |
9baf3220 | 25 | #include <linux/sysfs.h> |
de55d871 | 26 | |
e6cf0465 CC |
27 | #include "extcon.h" |
28 | ||
2a9de9c0 | 29 | #define SUPPORTED_CABLE_MAX 32 |
2a9de9c0 | 30 | |
5183240c | 31 | static const struct __extcon_info { |
55e4e2f1 CC |
32 | unsigned int type; |
33 | unsigned int id; | |
34 | const char *name; | |
35 | ||
36 | } extcon_info[] = { | |
37 | [EXTCON_NONE] = { | |
38 | .type = EXTCON_TYPE_MISC, | |
39 | .id = EXTCON_NONE, | |
40 | .name = "NONE", | |
41 | }, | |
73b6ecdb | 42 | |
8e9bc36d | 43 | /* USB external connector */ |
55e4e2f1 CC |
44 | [EXTCON_USB] = { |
45 | .type = EXTCON_TYPE_USB, | |
46 | .id = EXTCON_USB, | |
47 | .name = "USB", | |
48 | }, | |
49 | [EXTCON_USB_HOST] = { | |
50 | .type = EXTCON_TYPE_USB, | |
51 | .id = EXTCON_USB_HOST, | |
86d6cda6 | 52 | .name = "USB-HOST", |
55e4e2f1 | 53 | }, |
8e9bc36d | 54 | |
11eecf91 | 55 | /* Charging external connector */ |
55e4e2f1 CC |
56 | [EXTCON_CHG_USB_SDP] = { |
57 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
58 | .id = EXTCON_CHG_USB_SDP, | |
59 | .name = "SDP", | |
60 | }, | |
61 | [EXTCON_CHG_USB_DCP] = { | |
62 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
63 | .id = EXTCON_CHG_USB_DCP, | |
64 | .name = "DCP", | |
65 | }, | |
66 | [EXTCON_CHG_USB_CDP] = { | |
67 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
68 | .id = EXTCON_CHG_USB_CDP, | |
69 | .name = "CDP", | |
70 | }, | |
71 | [EXTCON_CHG_USB_ACA] = { | |
72 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
73 | .id = EXTCON_CHG_USB_ACA, | |
74 | .name = "ACA", | |
75 | }, | |
76 | [EXTCON_CHG_USB_FAST] = { | |
77 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
78 | .id = EXTCON_CHG_USB_FAST, | |
79 | .name = "FAST-CHARGER", | |
80 | }, | |
81 | [EXTCON_CHG_USB_SLOW] = { | |
82 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
83 | .id = EXTCON_CHG_USB_SLOW, | |
84 | .name = "SLOW-CHARGER", | |
85 | }, | |
7fe95fb8 CC |
86 | [EXTCON_CHG_WPT] = { |
87 | .type = EXTCON_TYPE_CHG, | |
88 | .id = EXTCON_CHG_WPT, | |
89 | .name = "WPT", | |
90 | }, | |
3c5f0e07 CC |
91 | [EXTCON_CHG_USB_PD] = { |
92 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
93 | .id = EXTCON_CHG_USB_PD, | |
94 | .name = "PD", | |
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 | }, | |
9c0595d6 CC |
165 | [EXTCON_DISP_HMD] = { |
166 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
167 | .id = EXTCON_DISP_HMD, | |
168 | .name = "HMD", | |
169 | }, | |
8e9bc36d | 170 | |
11eecf91 | 171 | /* Miscellaneous external connector */ |
55e4e2f1 CC |
172 | [EXTCON_DOCK] = { |
173 | .type = EXTCON_TYPE_MISC, | |
174 | .id = EXTCON_DOCK, | |
175 | .name = "DOCK", | |
176 | }, | |
177 | [EXTCON_JIG] = { | |
178 | .type = EXTCON_TYPE_MISC, | |
179 | .id = EXTCON_JIG, | |
180 | .name = "JIG", | |
181 | }, | |
182 | [EXTCON_MECHANICAL] = { | |
183 | .type = EXTCON_TYPE_MISC, | |
184 | .id = EXTCON_MECHANICAL, | |
185 | .name = "MECHANICAL", | |
186 | }, | |
187 | ||
188 | { /* sentinel */ } | |
806d9dd7 MH |
189 | }; |
190 | ||
20f7b53d | 191 | /** |
6ab6094f CC |
192 | * struct extcon_cable - An internal data for an external connector. |
193 | * @edev: the extcon device | |
194 | * @cable_index: the index of this cable in the edev | |
195 | * @attr_g: the attribute group for the cable | |
20f7b53d CC |
196 | * @attr_name: "name" sysfs entry |
197 | * @attr_state: "state" sysfs entry | |
6ab6094f | 198 | * @attrs: the array pointing to attr_name and attr_state for attr_g |
20f7b53d CC |
199 | */ |
200 | struct extcon_cable { | |
201 | struct extcon_dev *edev; | |
202 | int cable_index; | |
203 | ||
204 | struct attribute_group attr_g; | |
205 | struct device_attribute attr_name; | |
206 | struct device_attribute attr_state; | |
207 | ||
208 | struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ | |
792e7e9e CC |
209 | |
210 | union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT]; | |
211 | union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT]; | |
212 | union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT]; | |
213 | union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT]; | |
7f2a0a16 CC |
214 | |
215 | unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)]; | |
216 | unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)]; | |
217 | unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)]; | |
218 | unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)]; | |
20f7b53d CC |
219 | }; |
220 | ||
be3a07f7 | 221 | static struct class *extcon_class; |
de55d871 | 222 | |
74c5d09b DK |
223 | static LIST_HEAD(extcon_dev_list); |
224 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
225 | ||
bde68e60 MH |
226 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) |
227 | { | |
228 | int i = 0; | |
229 | ||
230 | if (!edev->mutually_exclusive) | |
231 | return 0; | |
232 | ||
233 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 234 | int weight; |
bde68e60 | 235 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 236 | |
28c0ada6 | 237 | /* calculate the total number of bits set */ |
238 | weight = hweight32(correspondants); | |
239 | if (weight > 1) | |
240 | return i + 1; | |
bde68e60 MH |
241 | } |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
73b6ecdb | 246 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
2a9de9c0 CC |
247 | { |
248 | int i; | |
249 | ||
250 | /* Find the the index of extcon cable in edev->supported_cable */ | |
251 | for (i = 0; i < edev->max_supported; i++) { | |
252 | if (edev->supported_cable[i] == id) | |
253 | return i; | |
254 | } | |
255 | ||
256 | return -EINVAL; | |
257 | } | |
258 | ||
792e7e9e CC |
259 | static int get_extcon_type(unsigned int prop) |
260 | { | |
261 | switch (prop) { | |
262 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
263 | return EXTCON_TYPE_USB; | |
264 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
265 | return EXTCON_TYPE_CHG; | |
266 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
267 | return EXTCON_TYPE_JACK; | |
268 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
269 | return EXTCON_TYPE_DISP; | |
270 | default: | |
271 | return -EINVAL; | |
272 | } | |
273 | } | |
274 | ||
275 | static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index) | |
276 | { | |
277 | return !!(edev->state & BIT(index)); | |
278 | } | |
279 | ||
ab11af04 CC |
280 | static bool is_extcon_changed(struct extcon_dev *edev, int index, |
281 | bool new_state) | |
046050f6 | 282 | { |
ab11af04 CC |
283 | int state = !!(edev->state & BIT(index)); |
284 | return (state != new_state); | |
046050f6 CC |
285 | } |
286 | ||
792e7e9e CC |
287 | static bool is_extcon_property_supported(unsigned int id, unsigned int prop) |
288 | { | |
289 | int type; | |
290 | ||
291 | /* Check whether the property is supported or not. */ | |
292 | type = get_extcon_type(prop); | |
293 | if (type < 0) | |
294 | return false; | |
295 | ||
296 | /* Check whether a specific extcon id supports the property or not. */ | |
297 | return !!(extcon_info[id].type & type); | |
298 | } | |
299 | ||
7f2a0a16 CC |
300 | static int is_extcon_property_capability(struct extcon_dev *edev, |
301 | unsigned int id, int index,unsigned int prop) | |
302 | { | |
303 | struct extcon_cable *cable; | |
304 | int type, ret; | |
305 | ||
306 | /* Check whether the property is supported or not. */ | |
307 | type = get_extcon_type(prop); | |
308 | if (type < 0) | |
309 | return type; | |
310 | ||
311 | cable = &edev->cables[index]; | |
312 | ||
313 | switch (type) { | |
314 | case EXTCON_TYPE_USB: | |
315 | ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
316 | break; | |
317 | case EXTCON_TYPE_CHG: | |
318 | ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
319 | break; | |
320 | case EXTCON_TYPE_JACK: | |
321 | ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
322 | break; | |
323 | case EXTCON_TYPE_DISP: | |
324 | ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
325 | break; | |
326 | default: | |
327 | ret = -EINVAL; | |
328 | } | |
329 | ||
330 | return ret; | |
331 | } | |
332 | ||
792e7e9e CC |
333 | static void init_property(struct extcon_dev *edev, unsigned int id, int index) |
334 | { | |
335 | unsigned int type = extcon_info[id].type; | |
336 | struct extcon_cable *cable = &edev->cables[index]; | |
337 | ||
338 | if (EXTCON_TYPE_USB & type) | |
339 | memset(cable->usb_propval, 0, sizeof(cable->usb_propval)); | |
340 | if (EXTCON_TYPE_CHG & type) | |
341 | memset(cable->chg_propval, 0, sizeof(cable->chg_propval)); | |
342 | if (EXTCON_TYPE_JACK & type) | |
343 | memset(cable->jack_propval, 0, sizeof(cable->jack_propval)); | |
344 | if (EXTCON_TYPE_DISP & type) | |
345 | memset(cable->disp_propval, 0, sizeof(cable->disp_propval)); | |
346 | } | |
347 | ||
de55d871 MH |
348 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
349 | char *buf) | |
350 | { | |
806d9dd7 | 351 | int i, count = 0; |
cb8bb3a7 | 352 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 353 | |
806d9dd7 MH |
354 | if (edev->max_supported == 0) |
355 | return sprintf(buf, "%u\n", edev->state); | |
356 | ||
2a9de9c0 | 357 | for (i = 0; i < edev->max_supported; i++) { |
806d9dd7 | 358 | count += sprintf(buf + count, "%s=%d\n", |
55e4e2f1 | 359 | extcon_info[edev->supported_cable[i]].name, |
70641a0a | 360 | !!(edev->state & BIT(i))); |
806d9dd7 MH |
361 | } |
362 | ||
363 | return count; | |
364 | } | |
5d5321e9 | 365 | static DEVICE_ATTR_RO(state); |
de55d871 MH |
366 | |
367 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
368 | char *buf) | |
369 | { | |
cb8bb3a7 | 370 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 371 | |
71c3ffa5 | 372 | return sprintf(buf, "%s\n", edev->name); |
de55d871 | 373 | } |
af01da0e | 374 | static DEVICE_ATTR_RO(name); |
de55d871 | 375 | |
806d9dd7 MH |
376 | static ssize_t cable_name_show(struct device *dev, |
377 | struct device_attribute *attr, char *buf) | |
378 | { | |
379 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
380 | attr_name); | |
2a9de9c0 | 381 | int i = cable->cable_index; |
806d9dd7 MH |
382 | |
383 | return sprintf(buf, "%s\n", | |
55e4e2f1 | 384 | extcon_info[cable->edev->supported_cable[i]].name); |
806d9dd7 MH |
385 | } |
386 | ||
387 | static ssize_t cable_state_show(struct device *dev, | |
388 | struct device_attribute *attr, char *buf) | |
389 | { | |
390 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
391 | attr_state); | |
392 | ||
be052cc8 RQ |
393 | int i = cable->cable_index; |
394 | ||
806d9dd7 | 395 | return sprintf(buf, "%d\n", |
575c2b86 | 396 | extcon_get_state(cable->edev, cable->edev->supported_cable[i])); |
806d9dd7 MH |
397 | } |
398 | ||
de55d871 | 399 | /** |
6ab6094f CC |
400 | * extcon_sync() - Synchronize the state for an external connector. |
401 | * @edev: the extcon device | |
402 | * | |
403 | * Note that this function send a notification in order to synchronize | |
404 | * the state and property of an external connector. | |
74c5d09b | 405 | * |
6ab6094f | 406 | * Returns 0 if success or error number if fail. |
de55d871 | 407 | */ |
ab11af04 | 408 | int extcon_sync(struct extcon_dev *edev, unsigned int id) |
de55d871 MH |
409 | { |
410 | char name_buf[120]; | |
411 | char state_buf[120]; | |
412 | char *prop_buf; | |
413 | char *envp[3]; | |
414 | int env_offset = 0; | |
415 | int length; | |
046050f6 | 416 | int index; |
ab11af04 | 417 | int state; |
806d9dd7 | 418 | unsigned long flags; |
de55d871 | 419 | |
7eae43ae CC |
420 | if (!edev) |
421 | return -EINVAL; | |
422 | ||
ab11af04 CC |
423 | index = find_cable_index_by_id(edev, id); |
424 | if (index < 0) | |
425 | return index; | |
426 | ||
806d9dd7 | 427 | spin_lock_irqsave(&edev->lock, flags); |
ab11af04 | 428 | state = !!(edev->state & BIT(index)); |
8a9dbb77 | 429 | spin_unlock_irqrestore(&edev->lock, flags); |
815429b3 CC |
430 | |
431 | /* | |
432 | * Call functions in a raw notifier chain for the specific one | |
433 | * external connector. | |
434 | */ | |
ab11af04 CC |
435 | raw_notifier_call_chain(&edev->nh[index], state, edev); |
436 | ||
815429b3 CC |
437 | /* |
438 | * Call functions in a raw notifier chain for the all supported | |
439 | * external connectors. | |
440 | */ | |
441 | raw_notifier_call_chain(&edev->nh_all, state, edev); | |
442 | ||
8a9dbb77 | 443 | spin_lock_irqsave(&edev->lock, flags); |
ab11af04 CC |
444 | /* This could be in interrupt handler */ |
445 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
446 | if (!prop_buf) { | |
447 | /* Unlock early before uevent */ | |
806d9dd7 | 448 | spin_unlock_irqrestore(&edev->lock, flags); |
ab11af04 CC |
449 | |
450 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); | |
451 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
452 | ||
e7d9dd5a | 453 | return -ENOMEM; |
ab11af04 CC |
454 | } |
455 | ||
456 | length = name_show(&edev->dev, NULL, prop_buf); | |
457 | if (length > 0) { | |
458 | if (prop_buf[length - 1] == '\n') | |
459 | prop_buf[length - 1] = 0; | |
460 | snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf); | |
461 | envp[env_offset++] = name_buf; | |
462 | } | |
463 | ||
464 | length = state_show(&edev->dev, NULL, prop_buf); | |
465 | if (length > 0) { | |
466 | if (prop_buf[length - 1] == '\n') | |
467 | prop_buf[length - 1] = 0; | |
468 | snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf); | |
469 | envp[env_offset++] = state_buf; | |
de55d871 | 470 | } |
ab11af04 CC |
471 | envp[env_offset] = NULL; |
472 | ||
473 | /* Unlock early before uevent */ | |
474 | spin_unlock_irqrestore(&edev->lock, flags); | |
475 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); | |
476 | free_page((unsigned long)prop_buf); | |
bde68e60 MH |
477 | |
478 | return 0; | |
de55d871 | 479 | } |
ab11af04 | 480 | EXPORT_SYMBOL_GPL(extcon_sync); |
de55d871 | 481 | |
806d9dd7 | 482 | /** |
6ab6094f CC |
483 | * extcon_get_state() - Get the state of an external connector. |
484 | * @edev: the extcon device | |
485 | * @id: the unique id indicating an external connector | |
486 | * | |
487 | * Returns 0 if success or error number if fail. | |
806d9dd7 | 488 | */ |
575c2b86 | 489 | int extcon_get_state(struct extcon_dev *edev, const unsigned int id) |
806d9dd7 | 490 | { |
575c2b86 CC |
491 | int index, state; |
492 | unsigned long flags; | |
806d9dd7 | 493 | |
7eae43ae CC |
494 | if (!edev) |
495 | return -EINVAL; | |
496 | ||
2a9de9c0 CC |
497 | index = find_cable_index_by_id(edev, id); |
498 | if (index < 0) | |
499 | return index; | |
806d9dd7 | 500 | |
575c2b86 CC |
501 | spin_lock_irqsave(&edev->lock, flags); |
502 | state = is_extcon_attached(edev, index); | |
503 | spin_unlock_irqrestore(&edev->lock, flags); | |
806d9dd7 | 504 | |
575c2b86 | 505 | return state; |
806d9dd7 | 506 | } |
575c2b86 | 507 | EXPORT_SYMBOL_GPL(extcon_get_state); |
806d9dd7 | 508 | |
806d9dd7 | 509 | /** |
6ab6094f CC |
510 | * extcon_set_state() - Set the state of an external connector. |
511 | * @edev: the extcon device | |
512 | * @id: the unique id indicating an external connector | |
513 | * @state: the new state of an external connector. | |
514 | * the default semantics is true: attached / false: detached. | |
515 | * | |
516 | * Note that this function set the state of an external connector without | |
517 | * a notification. To synchronize the state of an external connector, | |
518 | * have to use extcon_set_state_sync() and extcon_sync(). | |
ab11af04 | 519 | * |
6ab6094f | 520 | * Returns 0 if success or error number if fail. |
806d9dd7 | 521 | */ |
6ab6094f | 522 | int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state) |
806d9dd7 | 523 | { |
ab11af04 CC |
524 | unsigned long flags; |
525 | int index, ret = 0; | |
806d9dd7 | 526 | |
7eae43ae CC |
527 | if (!edev) |
528 | return -EINVAL; | |
529 | ||
2a9de9c0 CC |
530 | index = find_cable_index_by_id(edev, id); |
531 | if (index < 0) | |
532 | return index; | |
533 | ||
ab11af04 CC |
534 | spin_lock_irqsave(&edev->lock, flags); |
535 | ||
536 | /* Check whether the external connector's state is changed. */ | |
6ab6094f | 537 | if (!is_extcon_changed(edev, index, state)) |
ab11af04 CC |
538 | goto out; |
539 | ||
540 | if (check_mutually_exclusive(edev, | |
6ab6094f | 541 | (edev->state & ~BIT(index)) | (state & BIT(index)))) { |
ab11af04 CC |
542 | ret = -EPERM; |
543 | goto out; | |
544 | } | |
545 | ||
792e7e9e CC |
546 | /* |
547 | * Initialize the value of extcon property before setting | |
548 | * the detached state for an external connector. | |
549 | */ | |
6ab6094f | 550 | if (!state) |
792e7e9e CC |
551 | init_property(edev, id, index); |
552 | ||
6ab6094f CC |
553 | /* Update the state for an external connector. */ |
554 | if (state) | |
ab11af04 CC |
555 | edev->state |= BIT(index); |
556 | else | |
557 | edev->state &= ~(BIT(index)); | |
558 | out: | |
559 | spin_unlock_irqrestore(&edev->lock, flags); | |
560 | ||
561 | return ret; | |
806d9dd7 | 562 | } |
575c2b86 | 563 | EXPORT_SYMBOL_GPL(extcon_set_state); |
806d9dd7 | 564 | |
ab11af04 | 565 | /** |
6ab6094f CC |
566 | * extcon_set_state_sync() - Set the state of an external connector with sync. |
567 | * @edev: the extcon device | |
568 | * @id: the unique id indicating an external connector | |
569 | * @state: the new state of external connector. | |
570 | * the default semantics is true: attached / false: detached. | |
571 | * | |
572 | * Note that this function set the state of external connector | |
573 | * and synchronize the state by sending a notification. | |
ab11af04 | 574 | * |
6ab6094f | 575 | * Returns 0 if success or error number if fail. |
ab11af04 | 576 | */ |
6ab6094f | 577 | int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state) |
ab11af04 CC |
578 | { |
579 | int ret, index; | |
580 | unsigned long flags; | |
581 | ||
582 | index = find_cable_index_by_id(edev, id); | |
583 | if (index < 0) | |
584 | return index; | |
585 | ||
586 | /* Check whether the external connector's state is changed. */ | |
587 | spin_lock_irqsave(&edev->lock, flags); | |
6ab6094f | 588 | ret = is_extcon_changed(edev, index, state); |
ab11af04 CC |
589 | spin_unlock_irqrestore(&edev->lock, flags); |
590 | if (!ret) | |
591 | return 0; | |
592 | ||
6ab6094f | 593 | ret = extcon_set_state(edev, id, state); |
ab11af04 CC |
594 | if (ret < 0) |
595 | return ret; | |
596 | ||
597 | return extcon_sync(edev, id); | |
598 | } | |
599 | EXPORT_SYMBOL_GPL(extcon_set_state_sync); | |
600 | ||
792e7e9e | 601 | /** |
6ab6094f CC |
602 | * extcon_get_property() - Get the property value of an external connector. |
603 | * @edev: the extcon device | |
604 | * @id: the unique id indicating an external connector | |
605 | * @prop: the property id indicating an extcon property | |
606 | * @prop_val: the pointer which store the value of extcon property | |
792e7e9e | 607 | * |
6ab6094f CC |
608 | * Note that when getting the property value of external connector, |
609 | * the external connector should be attached. If detached state, function | |
610 | * return 0 without property value. Also, the each property should be | |
611 | * included in the list of supported properties according to extcon type. | |
792e7e9e | 612 | * |
6ab6094f | 613 | * Returns 0 if success or error number if fail. |
792e7e9e CC |
614 | */ |
615 | int extcon_get_property(struct extcon_dev *edev, unsigned int id, | |
616 | unsigned int prop, | |
617 | union extcon_property_value *prop_val) | |
618 | { | |
619 | struct extcon_cable *cable; | |
620 | unsigned long flags; | |
621 | int index, ret = 0; | |
622 | ||
cff7499d | 623 | *prop_val = (union extcon_property_value){0}; |
792e7e9e CC |
624 | |
625 | if (!edev) | |
626 | return -EINVAL; | |
627 | ||
628 | /* Check whether the property is supported or not */ | |
629 | if (!is_extcon_property_supported(id, prop)) | |
630 | return -EINVAL; | |
631 | ||
632 | /* Find the cable index of external connector by using id */ | |
633 | index = find_cable_index_by_id(edev, id); | |
634 | if (index < 0) | |
635 | return index; | |
636 | ||
637 | spin_lock_irqsave(&edev->lock, flags); | |
638 | ||
7f2a0a16 CC |
639 | /* Check whether the property is available or not. */ |
640 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
641 | spin_unlock_irqrestore(&edev->lock, flags); | |
642 | return -EPERM; | |
643 | } | |
644 | ||
792e7e9e CC |
645 | /* |
646 | * Check whether the external connector is attached. | |
647 | * If external connector is detached, the user can not | |
648 | * get the property value. | |
649 | */ | |
650 | if (!is_extcon_attached(edev, index)) { | |
651 | spin_unlock_irqrestore(&edev->lock, flags); | |
652 | return 0; | |
653 | } | |
654 | ||
655 | cable = &edev->cables[index]; | |
656 | ||
657 | /* Get the property value according to extcon type */ | |
658 | switch (prop) { | |
659 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
660 | *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN]; | |
661 | break; | |
662 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
663 | *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN]; | |
664 | break; | |
665 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
666 | *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN]; | |
667 | break; | |
668 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
669 | *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN]; | |
670 | break; | |
671 | default: | |
672 | ret = -EINVAL; | |
673 | break; | |
674 | } | |
675 | ||
676 | spin_unlock_irqrestore(&edev->lock, flags); | |
677 | ||
678 | return ret; | |
679 | } | |
680 | EXPORT_SYMBOL_GPL(extcon_get_property); | |
681 | ||
682 | /** | |
6ab6094f CC |
683 | * extcon_set_property() - Set the property value of an external connector. |
684 | * @edev: the extcon device | |
685 | * @id: the unique id indicating an external connector | |
686 | * @prop: the property id indicating an extcon property | |
687 | * @prop_val: the pointer including the new value of extcon property | |
792e7e9e | 688 | * |
6ab6094f CC |
689 | * Note that each property should be included in the list of supported |
690 | * properties according to the extcon type. | |
792e7e9e | 691 | * |
6ab6094f | 692 | * Returns 0 if success or error number if fail. |
792e7e9e CC |
693 | */ |
694 | int extcon_set_property(struct extcon_dev *edev, unsigned int id, | |
695 | unsigned int prop, | |
696 | union extcon_property_value prop_val) | |
697 | { | |
698 | struct extcon_cable *cable; | |
699 | unsigned long flags; | |
700 | int index, ret = 0; | |
701 | ||
702 | if (!edev) | |
703 | return -EINVAL; | |
704 | ||
705 | /* Check whether the property is supported or not */ | |
706 | if (!is_extcon_property_supported(id, prop)) | |
707 | return -EINVAL; | |
708 | ||
709 | /* Find the cable index of external connector by using id */ | |
710 | index = find_cable_index_by_id(edev, id); | |
711 | if (index < 0) | |
712 | return index; | |
713 | ||
714 | spin_lock_irqsave(&edev->lock, flags); | |
715 | ||
7f2a0a16 CC |
716 | /* Check whether the property is available or not. */ |
717 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
718 | spin_unlock_irqrestore(&edev->lock, flags); | |
719 | return -EPERM; | |
720 | } | |
721 | ||
792e7e9e CC |
722 | cable = &edev->cables[index]; |
723 | ||
724 | /* Set the property value according to extcon type */ | |
725 | switch (prop) { | |
726 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
727 | cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val; | |
728 | break; | |
729 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
730 | cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val; | |
731 | break; | |
732 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
733 | cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val; | |
734 | break; | |
735 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
736 | cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val; | |
737 | break; | |
738 | default: | |
739 | ret = -EINVAL; | |
740 | break; | |
741 | } | |
742 | ||
743 | spin_unlock_irqrestore(&edev->lock, flags); | |
744 | ||
745 | return ret; | |
746 | } | |
747 | EXPORT_SYMBOL_GPL(extcon_set_property); | |
748 | ||
ab11af04 | 749 | /** |
6ab6094f CC |
750 | * extcon_set_property_sync() - Set property of an external connector with sync. |
751 | * @prop_val: the pointer including the new value of extcon property | |
ab11af04 | 752 | * |
6ab6094f CC |
753 | * Note that when setting the property value of external connector, |
754 | * the external connector should be attached. The each property should | |
755 | * be included in the list of supported properties according to extcon type. | |
ab11af04 | 756 | * |
6ab6094f | 757 | * Returns 0 if success or error number if fail. |
ab11af04 CC |
758 | */ |
759 | int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id, | |
760 | unsigned int prop, | |
761 | union extcon_property_value prop_val) | |
762 | { | |
763 | int ret; | |
764 | ||
765 | ret = extcon_set_property(edev, id, prop, prop_val); | |
766 | if (ret < 0) | |
767 | return ret; | |
768 | ||
769 | return extcon_sync(edev, id); | |
770 | } | |
771 | EXPORT_SYMBOL_GPL(extcon_set_property_sync); | |
772 | ||
7f2a0a16 | 773 | /** |
6ab6094f CC |
774 | * extcon_get_property_capability() - Get the capability of the property |
775 | * for an external connector. | |
776 | * @edev: the extcon device | |
777 | * @id: the unique id indicating an external connector | |
778 | * @prop: the property id indicating an extcon property | |
7f2a0a16 CC |
779 | * |
780 | * Returns 1 if the property is available or 0 if not available. | |
781 | */ | |
782 | int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id, | |
783 | unsigned int prop) | |
784 | { | |
785 | int index; | |
786 | ||
787 | if (!edev) | |
788 | return -EINVAL; | |
789 | ||
790 | /* Check whether the property is supported or not */ | |
791 | if (!is_extcon_property_supported(id, prop)) | |
792 | return -EINVAL; | |
793 | ||
794 | /* Find the cable index of external connector by using id */ | |
795 | index = find_cable_index_by_id(edev, id); | |
796 | if (index < 0) | |
797 | return index; | |
798 | ||
799 | return is_extcon_property_capability(edev, id, index, prop); | |
800 | } | |
801 | EXPORT_SYMBOL_GPL(extcon_get_property_capability); | |
802 | ||
803 | /** | |
6ab6094f CC |
804 | * extcon_set_property_capability() - Set the capability of the property |
805 | * for an external connector. | |
806 | * @edev: the extcon device | |
807 | * @id: the unique id indicating an external connector | |
808 | * @prop: the property id indicating an extcon property | |
7f2a0a16 | 809 | * |
6ab6094f CC |
810 | * Note that this function set the capability of the property |
811 | * for an external connector in order to mark the bit in capability | |
812 | * bitmap which mean the available state of the property. | |
7f2a0a16 | 813 | * |
6ab6094f | 814 | * Returns 0 if success or error number if fail. |
7f2a0a16 CC |
815 | */ |
816 | int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id, | |
817 | unsigned int prop) | |
818 | { | |
819 | struct extcon_cable *cable; | |
820 | int index, type, ret = 0; | |
821 | ||
822 | if (!edev) | |
823 | return -EINVAL; | |
824 | ||
825 | /* Check whether the property is supported or not. */ | |
826 | if (!is_extcon_property_supported(id, prop)) | |
827 | return -EINVAL; | |
828 | ||
829 | /* Find the cable index of external connector by using id. */ | |
830 | index = find_cable_index_by_id(edev, id); | |
831 | if (index < 0) | |
832 | return index; | |
833 | ||
834 | type = get_extcon_type(prop); | |
835 | if (type < 0) | |
836 | return type; | |
837 | ||
838 | cable = &edev->cables[index]; | |
839 | ||
840 | switch (type) { | |
841 | case EXTCON_TYPE_USB: | |
842 | __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
843 | break; | |
844 | case EXTCON_TYPE_CHG: | |
845 | __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
846 | break; | |
847 | case EXTCON_TYPE_JACK: | |
848 | __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
849 | break; | |
850 | case EXTCON_TYPE_DISP: | |
851 | __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
852 | break; | |
853 | default: | |
854 | ret = -EINVAL; | |
855 | } | |
856 | ||
857 | return ret; | |
858 | } | |
859 | EXPORT_SYMBOL_GPL(extcon_set_property_capability); | |
860 | ||
74c5d09b | 861 | /** |
6ab6094f CC |
862 | * extcon_get_extcon_dev() - Get the extcon device instance from the name. |
863 | * @extcon_name: the extcon name provided with extcon_dev_register() | |
864 | * | |
865 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. | |
74c5d09b DK |
866 | */ |
867 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
868 | { | |
869 | struct extcon_dev *sd; | |
870 | ||
7eae43ae CC |
871 | if (!extcon_name) |
872 | return ERR_PTR(-EINVAL); | |
873 | ||
74c5d09b DK |
874 | mutex_lock(&extcon_dev_list_lock); |
875 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
876 | if (!strcmp(sd->name, extcon_name)) | |
877 | goto out; | |
878 | } | |
879 | sd = NULL; | |
880 | out: | |
881 | mutex_unlock(&extcon_dev_list_lock); | |
882 | return sd; | |
883 | } | |
884 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
885 | ||
886 | /** | |
6ab6094f CC |
887 | * extcon_register_notifier() - Register a notifier block to get notified by |
888 | * any state changes from the extcon. | |
889 | * @edev: the extcon device | |
890 | * @id: the unique id indicating an external connector | |
891 | * @nb: a notifier block to be registered | |
806d9dd7 MH |
892 | * |
893 | * Note that the second parameter given to the callback of nb (val) is | |
6ab6094f CC |
894 | * the current state of an external connector and the third pameter |
895 | * is the pointer of extcon device. | |
896 | * | |
897 | * Returns 0 if success or error number if fail. | |
74c5d09b | 898 | */ |
73b6ecdb | 899 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 900 | struct notifier_block *nb) |
74c5d09b | 901 | { |
66bee35f | 902 | unsigned long flags; |
1fa80f18 | 903 | int ret, idx; |
046050f6 | 904 | |
01b4c9a1 | 905 | if (!edev || !nb) |
7eae43ae CC |
906 | return -EINVAL; |
907 | ||
01b4c9a1 CC |
908 | idx = find_cable_index_by_id(edev, id); |
909 | if (idx < 0) | |
910 | return idx; | |
66bee35f | 911 | |
01b4c9a1 CC |
912 | spin_lock_irqsave(&edev->lock, flags); |
913 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); | |
914 | spin_unlock_irqrestore(&edev->lock, flags); | |
66bee35f HG |
915 | |
916 | return ret; | |
74c5d09b DK |
917 | } |
918 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
919 | ||
920 | /** | |
6ab6094f CC |
921 | * extcon_unregister_notifier() - Unregister a notifier block from the extcon. |
922 | * @edev: the extcon device | |
923 | * @id: the unique id indicating an external connector | |
924 | * @nb: a notifier block to be registered | |
925 | * | |
926 | * Returns 0 if success or error number if fail. | |
74c5d09b | 927 | */ |
73b6ecdb | 928 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 929 | struct notifier_block *nb) |
74c5d09b | 930 | { |
66bee35f | 931 | unsigned long flags; |
046050f6 CC |
932 | int ret, idx; |
933 | ||
7eae43ae CC |
934 | if (!edev || !nb) |
935 | return -EINVAL; | |
936 | ||
046050f6 | 937 | idx = find_cable_index_by_id(edev, id); |
a05f44c8 SB |
938 | if (idx < 0) |
939 | return idx; | |
66bee35f HG |
940 | |
941 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 942 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
66bee35f HG |
943 | spin_unlock_irqrestore(&edev->lock, flags); |
944 | ||
945 | return ret; | |
74c5d09b DK |
946 | } |
947 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
948 | ||
815429b3 | 949 | /** |
6ab6094f CC |
950 | * extcon_register_notifier_all() - Register a notifier block for all connectors. |
951 | * @edev: the extcon device | |
952 | * @nb: a notifier block to be registered | |
815429b3 | 953 | * |
6ab6094f CC |
954 | * Note that this function registers a notifier block in order to receive |
955 | * the state change of all supported external connectors from extcon device. | |
826a47e9 | 956 | * And the second parameter given to the callback of nb (val) is |
6ab6094f | 957 | * the current state and the third pameter is the pointer of extcon device. |
815429b3 | 958 | * |
6ab6094f | 959 | * Returns 0 if success or error number if fail. |
815429b3 CC |
960 | */ |
961 | int extcon_register_notifier_all(struct extcon_dev *edev, | |
962 | struct notifier_block *nb) | |
963 | { | |
964 | unsigned long flags; | |
965 | int ret; | |
966 | ||
967 | if (!edev || !nb) | |
968 | return -EINVAL; | |
969 | ||
970 | spin_lock_irqsave(&edev->lock, flags); | |
971 | ret = raw_notifier_chain_register(&edev->nh_all, nb); | |
972 | spin_unlock_irqrestore(&edev->lock, flags); | |
973 | ||
974 | return ret; | |
975 | } | |
976 | EXPORT_SYMBOL_GPL(extcon_register_notifier_all); | |
977 | ||
978 | /** | |
979 | * extcon_unregister_notifier_all() - Unregister a notifier block from extcon. | |
6ab6094f CC |
980 | * @edev: the extcon device |
981 | * @nb: a notifier block to be registered | |
815429b3 | 982 | * |
6ab6094f | 983 | * Returns 0 if success or error number if fail. |
815429b3 CC |
984 | */ |
985 | int extcon_unregister_notifier_all(struct extcon_dev *edev, | |
986 | struct notifier_block *nb) | |
987 | { | |
988 | unsigned long flags; | |
989 | int ret; | |
990 | ||
991 | if (!edev || !nb) | |
992 | return -EINVAL; | |
993 | ||
994 | spin_lock_irqsave(&edev->lock, flags); | |
995 | ret = raw_notifier_chain_unregister(&edev->nh_all, nb); | |
996 | spin_unlock_irqrestore(&edev->lock, flags); | |
997 | ||
998 | return ret; | |
999 | } | |
1000 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all); | |
1001 | ||
af01da0e GKH |
1002 | static struct attribute *extcon_attrs[] = { |
1003 | &dev_attr_state.attr, | |
1004 | &dev_attr_name.attr, | |
1005 | NULL, | |
de55d871 | 1006 | }; |
af01da0e | 1007 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
1008 | |
1009 | static int create_extcon_class(void) | |
1010 | { | |
1011 | if (!extcon_class) { | |
1012 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
1013 | if (IS_ERR(extcon_class)) | |
1014 | return PTR_ERR(extcon_class); | |
af01da0e | 1015 | extcon_class->dev_groups = extcon_groups; |
de55d871 MH |
1016 | } |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
de55d871 MH |
1021 | static void extcon_dev_release(struct device *dev) |
1022 | { | |
de55d871 MH |
1023 | } |
1024 | ||
bde68e60 | 1025 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
1026 | static void dummy_sysfs_dev_release(struct device *dev) |
1027 | { | |
1028 | } | |
1029 | ||
a9af6522 CC |
1030 | /* |
1031 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
6ab6094f CC |
1032 | * @supported_cable: the array of the supported external connectors |
1033 | * ending with EXTCON_NONE. | |
a9af6522 | 1034 | * |
6ab6094f CC |
1035 | * Note that this function allocates the memory for extcon device |
1036 | * and initialize default setting for the extcon device. | |
a9af6522 | 1037 | * |
6ab6094f CC |
1038 | * Returns the pointer memory of allocated extcon_dev if success |
1039 | * or ERR_PTR(err) if fail. | |
a9af6522 | 1040 | */ |
73b6ecdb | 1041 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
a9af6522 CC |
1042 | { |
1043 | struct extcon_dev *edev; | |
1044 | ||
7eae43ae CC |
1045 | if (!supported_cable) |
1046 | return ERR_PTR(-EINVAL); | |
1047 | ||
a9af6522 CC |
1048 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
1049 | if (!edev) | |
1050 | return ERR_PTR(-ENOMEM); | |
1051 | ||
1052 | edev->max_supported = 0; | |
1053 | edev->supported_cable = supported_cable; | |
1054 | ||
1055 | return edev; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * extcon_dev_free() - Free the memory of extcon device. | |
6ab6094f | 1060 | * @edev: the extcon device |
a9af6522 CC |
1061 | */ |
1062 | void extcon_dev_free(struct extcon_dev *edev) | |
1063 | { | |
1064 | kfree(edev); | |
1065 | } | |
1066 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
1067 | ||
de55d871 | 1068 | /** |
6ab6094f CC |
1069 | * extcon_dev_register() - Register an new extcon device |
1070 | * @edev: the extcon device to be registered | |
de55d871 MH |
1071 | * |
1072 | * Among the members of edev struct, please set the "user initializing data" | |
de55d871 MH |
1073 | * do not set the values of "internal data", which are initialized by |
1074 | * this function. | |
6ab6094f CC |
1075 | * |
1076 | * Note that before calling this funciton, have to allocate the memory | |
1077 | * of an extcon device by using the extcon_dev_allocate(). And the extcon | |
1078 | * dev should include the supported_cable information. | |
1079 | * | |
1080 | * Returns 0 if success or error number if fail. | |
de55d871 | 1081 | */ |
42d7d753 | 1082 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 1083 | { |
806d9dd7 | 1084 | int ret, index = 0; |
71c3ffa5 | 1085 | static atomic_t edev_no = ATOMIC_INIT(-1); |
de55d871 MH |
1086 | |
1087 | if (!extcon_class) { | |
1088 | ret = create_extcon_class(); | |
1089 | if (ret < 0) | |
1090 | return ret; | |
1091 | } | |
1092 | ||
7eae43ae | 1093 | if (!edev || !edev->supported_cable) |
2a9de9c0 CC |
1094 | return -EINVAL; |
1095 | ||
1096 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); | |
806d9dd7 | 1097 | |
2a9de9c0 | 1098 | edev->max_supported = index; |
806d9dd7 | 1099 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
1100 | dev_err(&edev->dev, |
1101 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
1102 | return -EINVAL; |
1103 | } | |
1104 | ||
dae61651 CC |
1105 | edev->dev.class = extcon_class; |
1106 | edev->dev.release = extcon_dev_release; | |
de55d871 | 1107 | |
71c3ffa5 | 1108 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
1109 | if (IS_ERR_OR_NULL(edev->name)) { |
1110 | dev_err(&edev->dev, | |
1111 | "extcon device name is null\n"); | |
1112 | return -EINVAL; | |
1113 | } | |
71c3ffa5 CC |
1114 | dev_set_name(&edev->dev, "extcon%lu", |
1115 | (unsigned long)atomic_inc_return(&edev_no)); | |
806d9dd7 MH |
1116 | |
1117 | if (edev->max_supported) { | |
806d9dd7 MH |
1118 | char *str; |
1119 | struct extcon_cable *cable; | |
1120 | ||
6396bb22 KC |
1121 | edev->cables = kcalloc(edev->max_supported, |
1122 | sizeof(struct extcon_cable), | |
1123 | GFP_KERNEL); | |
806d9dd7 MH |
1124 | if (!edev->cables) { |
1125 | ret = -ENOMEM; | |
1126 | goto err_sysfs_alloc; | |
1127 | } | |
1128 | for (index = 0; index < edev->max_supported; index++) { | |
1129 | cable = &edev->cables[index]; | |
1130 | ||
69f75a4f | 1131 | str = kasprintf(GFP_KERNEL, "cable.%d", index); |
806d9dd7 MH |
1132 | if (!str) { |
1133 | for (index--; index >= 0; index--) { | |
1134 | cable = &edev->cables[index]; | |
1135 | kfree(cable->attr_g.name); | |
1136 | } | |
1137 | ret = -ENOMEM; | |
1138 | ||
1139 | goto err_alloc_cables; | |
1140 | } | |
806d9dd7 MH |
1141 | |
1142 | cable->edev = edev; | |
1143 | cable->cable_index = index; | |
1144 | cable->attrs[0] = &cable->attr_name.attr; | |
1145 | cable->attrs[1] = &cable->attr_state.attr; | |
1146 | cable->attrs[2] = NULL; | |
1147 | cable->attr_g.name = str; | |
1148 | cable->attr_g.attrs = cable->attrs; | |
1149 | ||
9baf3220 | 1150 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
1151 | cable->attr_name.attr.name = "name"; |
1152 | cable->attr_name.attr.mode = 0444; | |
1153 | cable->attr_name.show = cable_name_show; | |
1154 | ||
9baf3220 | 1155 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 1156 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 1157 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 1158 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
1159 | } |
1160 | } | |
1161 | ||
bde68e60 | 1162 | if (edev->max_supported && edev->mutually_exclusive) { |
bde68e60 MH |
1163 | char *name; |
1164 | ||
1165 | /* Count the size of mutually_exclusive array */ | |
1166 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1167 | ; | |
1168 | ||
6396bb22 KC |
1169 | edev->attrs_muex = kcalloc(index + 1, |
1170 | sizeof(struct attribute *), | |
1171 | GFP_KERNEL); | |
bde68e60 MH |
1172 | if (!edev->attrs_muex) { |
1173 | ret = -ENOMEM; | |
1174 | goto err_muex; | |
1175 | } | |
1176 | ||
6396bb22 KC |
1177 | edev->d_attrs_muex = kcalloc(index, |
1178 | sizeof(struct device_attribute), | |
1179 | GFP_KERNEL); | |
bde68e60 MH |
1180 | if (!edev->d_attrs_muex) { |
1181 | ret = -ENOMEM; | |
1182 | kfree(edev->attrs_muex); | |
1183 | goto err_muex; | |
1184 | } | |
1185 | ||
1186 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
69f75a4f AS |
1187 | name = kasprintf(GFP_KERNEL, "0x%x", |
1188 | edev->mutually_exclusive[index]); | |
bde68e60 MH |
1189 | if (!name) { |
1190 | for (index--; index >= 0; index--) { | |
1191 | kfree(edev->d_attrs_muex[index].attr. | |
1192 | name); | |
1193 | } | |
1194 | kfree(edev->d_attrs_muex); | |
1195 | kfree(edev->attrs_muex); | |
1196 | ret = -ENOMEM; | |
1197 | goto err_muex; | |
1198 | } | |
9baf3220 | 1199 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
1200 | edev->d_attrs_muex[index].attr.name = name; |
1201 | edev->d_attrs_muex[index].attr.mode = 0000; | |
1202 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
1203 | .attr; | |
1204 | } | |
1205 | edev->attr_g_muex.name = muex_name; | |
1206 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
1207 | ||
1208 | } | |
1209 | ||
806d9dd7 MH |
1210 | if (edev->max_supported) { |
1211 | edev->extcon_dev_type.groups = | |
6396bb22 KC |
1212 | kcalloc(edev->max_supported + 2, |
1213 | sizeof(struct attribute_group *), | |
1214 | GFP_KERNEL); | |
806d9dd7 MH |
1215 | if (!edev->extcon_dev_type.groups) { |
1216 | ret = -ENOMEM; | |
1217 | goto err_alloc_groups; | |
1218 | } | |
1219 | ||
dae61651 | 1220 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
1221 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
1222 | ||
1223 | for (index = 0; index < edev->max_supported; index++) | |
1224 | edev->extcon_dev_type.groups[index] = | |
1225 | &edev->cables[index].attr_g; | |
bde68e60 MH |
1226 | if (edev->mutually_exclusive) |
1227 | edev->extcon_dev_type.groups[index] = | |
1228 | &edev->attr_g_muex; | |
806d9dd7 | 1229 | |
dae61651 | 1230 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
1231 | } |
1232 | ||
dae61651 | 1233 | ret = device_register(&edev->dev); |
de55d871 | 1234 | if (ret) { |
dae61651 | 1235 | put_device(&edev->dev); |
de55d871 MH |
1236 | goto err_dev; |
1237 | } | |
de55d871 | 1238 | |
806d9dd7 | 1239 | spin_lock_init(&edev->lock); |
3f5071a8 ME |
1240 | edev->nh = devm_kcalloc(&edev->dev, edev->max_supported, |
1241 | sizeof(*edev->nh), GFP_KERNEL); | |
046050f6 CC |
1242 | if (!edev->nh) { |
1243 | ret = -ENOMEM; | |
1244 | goto err_dev; | |
1245 | } | |
1246 | ||
1247 | for (index = 0; index < edev->max_supported; index++) | |
1248 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); | |
74c5d09b | 1249 | |
815429b3 CC |
1250 | RAW_INIT_NOTIFIER_HEAD(&edev->nh_all); |
1251 | ||
dae61651 | 1252 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 1253 | edev->state = 0; |
74c5d09b DK |
1254 | |
1255 | mutex_lock(&extcon_dev_list_lock); | |
1256 | list_add(&edev->entry, &extcon_dev_list); | |
1257 | mutex_unlock(&extcon_dev_list_lock); | |
1258 | ||
de55d871 MH |
1259 | return 0; |
1260 | ||
1261 | err_dev: | |
806d9dd7 MH |
1262 | if (edev->max_supported) |
1263 | kfree(edev->extcon_dev_type.groups); | |
1264 | err_alloc_groups: | |
bde68e60 MH |
1265 | if (edev->max_supported && edev->mutually_exclusive) { |
1266 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1267 | kfree(edev->d_attrs_muex[index].attr.name); | |
1268 | kfree(edev->d_attrs_muex); | |
1269 | kfree(edev->attrs_muex); | |
1270 | } | |
1271 | err_muex: | |
806d9dd7 MH |
1272 | for (index = 0; index < edev->max_supported; index++) |
1273 | kfree(edev->cables[index].attr_g.name); | |
1274 | err_alloc_cables: | |
1275 | if (edev->max_supported) | |
1276 | kfree(edev->cables); | |
1277 | err_sysfs_alloc: | |
de55d871 MH |
1278 | return ret; |
1279 | } | |
1280 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
1281 | ||
1282 | /** | |
1283 | * extcon_dev_unregister() - Unregister the extcon device. | |
6ab6094f | 1284 | * @edev: the extcon device to be unregistered. |
de55d871 MH |
1285 | * |
1286 | * Note that this does not call kfree(edev) because edev was not allocated | |
1287 | * by this class. | |
1288 | */ | |
1289 | void extcon_dev_unregister(struct extcon_dev *edev) | |
1290 | { | |
57e7cd37 | 1291 | int index; |
1292 | ||
7eae43ae CC |
1293 | if (!edev) |
1294 | return; | |
1295 | ||
57e7cd37 | 1296 | mutex_lock(&extcon_dev_list_lock); |
1297 | list_del(&edev->entry); | |
1298 | mutex_unlock(&extcon_dev_list_lock); | |
1299 | ||
dae61651 CC |
1300 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
1301 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
1302 | dev_name(&edev->dev)); | |
57e7cd37 | 1303 | return; |
1304 | } | |
1305 | ||
7585ca0d WX |
1306 | device_unregister(&edev->dev); |
1307 | ||
57e7cd37 | 1308 | if (edev->mutually_exclusive && edev->max_supported) { |
1309 | for (index = 0; edev->mutually_exclusive[index]; | |
1310 | index++) | |
1311 | kfree(edev->d_attrs_muex[index].attr.name); | |
1312 | kfree(edev->d_attrs_muex); | |
1313 | kfree(edev->attrs_muex); | |
1314 | } | |
1315 | ||
1316 | for (index = 0; index < edev->max_supported; index++) | |
1317 | kfree(edev->cables[index].attr_g.name); | |
1318 | ||
1319 | if (edev->max_supported) { | |
1320 | kfree(edev->extcon_dev_type.groups); | |
1321 | kfree(edev->cables); | |
1322 | } | |
1323 | ||
dae61651 | 1324 | put_device(&edev->dev); |
de55d871 MH |
1325 | } |
1326 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
1327 | ||
1ad94ffe | 1328 | #ifdef CONFIG_OF |
370ed7a9 AH |
1329 | |
1330 | /* | |
1331 | * extcon_find_edev_by_node - Find the extcon device from devicetree. | |
1332 | * @node : OF node identifying edev | |
1333 | * | |
1334 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. | |
1335 | */ | |
1336 | struct extcon_dev *extcon_find_edev_by_node(struct device_node *node) | |
1337 | { | |
1338 | struct extcon_dev *edev; | |
1339 | ||
1340 | mutex_lock(&extcon_dev_list_lock); | |
1341 | list_for_each_entry(edev, &extcon_dev_list, entry) | |
1342 | if (edev->dev.parent && edev->dev.parent->of_node == node) | |
1343 | goto out; | |
1344 | edev = ERR_PTR(-EPROBE_DEFER); | |
1345 | out: | |
1346 | mutex_unlock(&extcon_dev_list_lock); | |
1347 | ||
1348 | return edev; | |
1349 | } | |
1350 | ||
1ad94ffe | 1351 | /* |
6ab6094f CC |
1352 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree. |
1353 | * @dev : the instance to the given device | |
1354 | * @index : the index into list of extcon_dev | |
1ad94ffe | 1355 | * |
6ab6094f | 1356 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. |
1ad94ffe CC |
1357 | */ |
1358 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1359 | { | |
1360 | struct device_node *node; | |
1361 | struct extcon_dev *edev; | |
1362 | ||
7eae43ae CC |
1363 | if (!dev) |
1364 | return ERR_PTR(-EINVAL); | |
1365 | ||
1ad94ffe | 1366 | if (!dev->of_node) { |
e8752b7a | 1367 | dev_dbg(dev, "device does not have a device node entry\n"); |
1ad94ffe CC |
1368 | return ERR_PTR(-EINVAL); |
1369 | } | |
1370 | ||
1371 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
1372 | if (!node) { | |
5c27036d RH |
1373 | dev_dbg(dev, "failed to get phandle in %pOF node\n", |
1374 | dev->of_node); | |
1ad94ffe CC |
1375 | return ERR_PTR(-ENODEV); |
1376 | } | |
1377 | ||
370ed7a9 | 1378 | edev = extcon_find_edev_by_node(node); |
5d5c4c13 | 1379 | of_node_put(node); |
1ad94ffe | 1380 | |
370ed7a9 | 1381 | return edev; |
1ad94ffe | 1382 | } |
370ed7a9 | 1383 | |
1ad94ffe | 1384 | #else |
370ed7a9 AH |
1385 | |
1386 | struct extcon_dev *extcon_find_edev_by_node(struct device_node *node) | |
1387 | { | |
1388 | return ERR_PTR(-ENOSYS); | |
1389 | } | |
1390 | ||
1ad94ffe CC |
1391 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) |
1392 | { | |
1393 | return ERR_PTR(-ENOSYS); | |
1394 | } | |
370ed7a9 | 1395 | |
1ad94ffe | 1396 | #endif /* CONFIG_OF */ |
370ed7a9 AH |
1397 | |
1398 | EXPORT_SYMBOL_GPL(extcon_find_edev_by_node); | |
1ad94ffe CC |
1399 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); |
1400 | ||
707d7550 CC |
1401 | /** |
1402 | * extcon_get_edev_name() - Get the name of the extcon device. | |
1403 | * @edev: the extcon device | |
1404 | */ | |
1405 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
1406 | { | |
1407 | return !edev ? NULL : edev->name; | |
1408 | } | |
995bb109 | 1409 | EXPORT_SYMBOL_GPL(extcon_get_edev_name); |
707d7550 | 1410 | |
de55d871 MH |
1411 | static int __init extcon_class_init(void) |
1412 | { | |
1413 | return create_extcon_class(); | |
1414 | } | |
1415 | module_init(extcon_class_init); | |
1416 | ||
1417 | static void __exit extcon_class_exit(void) | |
1418 | { | |
1419 | class_destroy(extcon_class); | |
1420 | } | |
1421 | module_exit(extcon_class_exit); | |
1422 | ||
2a9de9c0 | 1423 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 | 1424 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
6ab6094f CC |
1425 | MODULE_DESCRIPTION("External Connector (extcon) framework"); |
1426 | MODULE_LICENSE("GPL v2"); |