Commit | Line | Data |
---|---|---|
de55d871 | 1 | /* |
6ab6094f | 2 | * drivers/extcon/extcon.c - External Connector (extcon) framework. |
de55d871 | 3 | * |
2a9de9c0 CC |
4 | * Copyright (C) 2015 Samsung Electronics |
5 | * Author: Chanwoo Choi <cw00.choi@samsung.com> | |
6 | * | |
de55d871 MH |
7 | * Copyright (C) 2012 Samsung Electronics |
8 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
9 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
10 | * | |
11 | * based on android/drivers/switch/switch_class.c | |
12 | * Copyright (C) 2008 Google, Inc. | |
13 | * Author: Mike Lockwood <lockwood@android.com> | |
14 | * | |
15 | * This software is licensed under the terms of the GNU General Public | |
16 | * License version 2, as published by the Free Software Foundation, and | |
17 | * may be copied, distributed, and modified under those terms. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
b9ec23c0 | 23 | */ |
de55d871 MH |
24 | |
25 | #include <linux/module.h> | |
26 | #include <linux/types.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/device.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/err.h> | |
f841afb1 | 31 | #include <linux/of.h> |
de55d871 | 32 | #include <linux/slab.h> |
9baf3220 | 33 | #include <linux/sysfs.h> |
de55d871 | 34 | |
e6cf0465 CC |
35 | #include "extcon.h" |
36 | ||
2a9de9c0 | 37 | #define SUPPORTED_CABLE_MAX 32 |
2a9de9c0 | 38 | |
5183240c | 39 | static const struct __extcon_info { |
55e4e2f1 CC |
40 | unsigned int type; |
41 | unsigned int id; | |
42 | const char *name; | |
43 | ||
44 | } extcon_info[] = { | |
45 | [EXTCON_NONE] = { | |
46 | .type = EXTCON_TYPE_MISC, | |
47 | .id = EXTCON_NONE, | |
48 | .name = "NONE", | |
49 | }, | |
73b6ecdb | 50 | |
8e9bc36d | 51 | /* USB external connector */ |
55e4e2f1 CC |
52 | [EXTCON_USB] = { |
53 | .type = EXTCON_TYPE_USB, | |
54 | .id = EXTCON_USB, | |
55 | .name = "USB", | |
56 | }, | |
57 | [EXTCON_USB_HOST] = { | |
58 | .type = EXTCON_TYPE_USB, | |
59 | .id = EXTCON_USB_HOST, | |
86d6cda6 | 60 | .name = "USB-HOST", |
55e4e2f1 | 61 | }, |
8e9bc36d | 62 | |
11eecf91 | 63 | /* Charging external connector */ |
55e4e2f1 CC |
64 | [EXTCON_CHG_USB_SDP] = { |
65 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
66 | .id = EXTCON_CHG_USB_SDP, | |
67 | .name = "SDP", | |
68 | }, | |
69 | [EXTCON_CHG_USB_DCP] = { | |
70 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
71 | .id = EXTCON_CHG_USB_DCP, | |
72 | .name = "DCP", | |
73 | }, | |
74 | [EXTCON_CHG_USB_CDP] = { | |
75 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
76 | .id = EXTCON_CHG_USB_CDP, | |
77 | .name = "CDP", | |
78 | }, | |
79 | [EXTCON_CHG_USB_ACA] = { | |
80 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
81 | .id = EXTCON_CHG_USB_ACA, | |
82 | .name = "ACA", | |
83 | }, | |
84 | [EXTCON_CHG_USB_FAST] = { | |
85 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
86 | .id = EXTCON_CHG_USB_FAST, | |
87 | .name = "FAST-CHARGER", | |
88 | }, | |
89 | [EXTCON_CHG_USB_SLOW] = { | |
90 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
91 | .id = EXTCON_CHG_USB_SLOW, | |
92 | .name = "SLOW-CHARGER", | |
93 | }, | |
7fe95fb8 CC |
94 | [EXTCON_CHG_WPT] = { |
95 | .type = EXTCON_TYPE_CHG, | |
96 | .id = EXTCON_CHG_WPT, | |
97 | .name = "WPT", | |
98 | }, | |
3c5f0e07 CC |
99 | [EXTCON_CHG_USB_PD] = { |
100 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
101 | .id = EXTCON_CHG_USB_PD, | |
102 | .name = "PD", | |
103 | }, | |
8e9bc36d | 104 | |
11eecf91 | 105 | /* Jack external connector */ |
55e4e2f1 CC |
106 | [EXTCON_JACK_MICROPHONE] = { |
107 | .type = EXTCON_TYPE_JACK, | |
108 | .id = EXTCON_JACK_MICROPHONE, | |
109 | .name = "MICROPHONE", | |
110 | }, | |
111 | [EXTCON_JACK_HEADPHONE] = { | |
112 | .type = EXTCON_TYPE_JACK, | |
113 | .id = EXTCON_JACK_HEADPHONE, | |
114 | .name = "HEADPHONE", | |
115 | }, | |
116 | [EXTCON_JACK_LINE_IN] = { | |
117 | .type = EXTCON_TYPE_JACK, | |
118 | .id = EXTCON_JACK_LINE_IN, | |
119 | .name = "LINE-IN", | |
120 | }, | |
121 | [EXTCON_JACK_LINE_OUT] = { | |
122 | .type = EXTCON_TYPE_JACK, | |
123 | .id = EXTCON_JACK_LINE_OUT, | |
124 | .name = "LINE-OUT", | |
125 | }, | |
126 | [EXTCON_JACK_VIDEO_IN] = { | |
127 | .type = EXTCON_TYPE_JACK, | |
128 | .id = EXTCON_JACK_VIDEO_IN, | |
129 | .name = "VIDEO-IN", | |
130 | }, | |
131 | [EXTCON_JACK_VIDEO_OUT] = { | |
132 | .type = EXTCON_TYPE_JACK, | |
133 | .id = EXTCON_JACK_VIDEO_OUT, | |
134 | .name = "VIDEO-OUT", | |
135 | }, | |
136 | [EXTCON_JACK_SPDIF_IN] = { | |
137 | .type = EXTCON_TYPE_JACK, | |
138 | .id = EXTCON_JACK_SPDIF_IN, | |
139 | .name = "SPDIF-IN", | |
140 | }, | |
141 | [EXTCON_JACK_SPDIF_OUT] = { | |
142 | .type = EXTCON_TYPE_JACK, | |
143 | .id = EXTCON_JACK_SPDIF_OUT, | |
144 | .name = "SPDIF-OUT", | |
145 | }, | |
8e9bc36d | 146 | |
11eecf91 | 147 | /* Display external connector */ |
55e4e2f1 CC |
148 | [EXTCON_DISP_HDMI] = { |
149 | .type = EXTCON_TYPE_DISP, | |
150 | .id = EXTCON_DISP_HDMI, | |
151 | .name = "HDMI", | |
152 | }, | |
153 | [EXTCON_DISP_MHL] = { | |
154 | .type = EXTCON_TYPE_DISP, | |
155 | .id = EXTCON_DISP_MHL, | |
156 | .name = "MHL", | |
157 | }, | |
158 | [EXTCON_DISP_DVI] = { | |
159 | .type = EXTCON_TYPE_DISP, | |
160 | .id = EXTCON_DISP_DVI, | |
161 | .name = "DVI", | |
162 | }, | |
163 | [EXTCON_DISP_VGA] = { | |
164 | .type = EXTCON_TYPE_DISP, | |
165 | .id = EXTCON_DISP_VGA, | |
166 | .name = "VGA", | |
167 | }, | |
2164188d CZ |
168 | [EXTCON_DISP_DP] = { |
169 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
170 | .id = EXTCON_DISP_DP, | |
171 | .name = "DP", | |
172 | }, | |
9c0595d6 CC |
173 | [EXTCON_DISP_HMD] = { |
174 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
175 | .id = EXTCON_DISP_HMD, | |
176 | .name = "HMD", | |
177 | }, | |
8e9bc36d | 178 | |
11eecf91 | 179 | /* Miscellaneous external connector */ |
55e4e2f1 CC |
180 | [EXTCON_DOCK] = { |
181 | .type = EXTCON_TYPE_MISC, | |
182 | .id = EXTCON_DOCK, | |
183 | .name = "DOCK", | |
184 | }, | |
185 | [EXTCON_JIG] = { | |
186 | .type = EXTCON_TYPE_MISC, | |
187 | .id = EXTCON_JIG, | |
188 | .name = "JIG", | |
189 | }, | |
190 | [EXTCON_MECHANICAL] = { | |
191 | .type = EXTCON_TYPE_MISC, | |
192 | .id = EXTCON_MECHANICAL, | |
193 | .name = "MECHANICAL", | |
194 | }, | |
195 | ||
196 | { /* sentinel */ } | |
806d9dd7 MH |
197 | }; |
198 | ||
20f7b53d | 199 | /** |
6ab6094f CC |
200 | * struct extcon_cable - An internal data for an external connector. |
201 | * @edev: the extcon device | |
202 | * @cable_index: the index of this cable in the edev | |
203 | * @attr_g: the attribute group for the cable | |
20f7b53d CC |
204 | * @attr_name: "name" sysfs entry |
205 | * @attr_state: "state" sysfs entry | |
6ab6094f | 206 | * @attrs: the array pointing to attr_name and attr_state for attr_g |
20f7b53d CC |
207 | */ |
208 | struct extcon_cable { | |
209 | struct extcon_dev *edev; | |
210 | int cable_index; | |
211 | ||
212 | struct attribute_group attr_g; | |
213 | struct device_attribute attr_name; | |
214 | struct device_attribute attr_state; | |
215 | ||
216 | struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ | |
792e7e9e CC |
217 | |
218 | union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT]; | |
219 | union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT]; | |
220 | union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT]; | |
221 | union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT]; | |
7f2a0a16 CC |
222 | |
223 | unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)]; | |
224 | unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)]; | |
225 | unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)]; | |
226 | unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)]; | |
20f7b53d CC |
227 | }; |
228 | ||
be3a07f7 | 229 | static struct class *extcon_class; |
de55d871 | 230 | |
74c5d09b DK |
231 | static LIST_HEAD(extcon_dev_list); |
232 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
233 | ||
bde68e60 MH |
234 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) |
235 | { | |
236 | int i = 0; | |
237 | ||
238 | if (!edev->mutually_exclusive) | |
239 | return 0; | |
240 | ||
241 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 242 | int weight; |
bde68e60 | 243 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 244 | |
28c0ada6 | 245 | /* calculate the total number of bits set */ |
246 | weight = hweight32(correspondants); | |
247 | if (weight > 1) | |
248 | return i + 1; | |
bde68e60 MH |
249 | } |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
73b6ecdb | 254 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
2a9de9c0 CC |
255 | { |
256 | int i; | |
257 | ||
258 | /* Find the the index of extcon cable in edev->supported_cable */ | |
259 | for (i = 0; i < edev->max_supported; i++) { | |
260 | if (edev->supported_cable[i] == id) | |
261 | return i; | |
262 | } | |
263 | ||
264 | return -EINVAL; | |
265 | } | |
266 | ||
792e7e9e CC |
267 | static int get_extcon_type(unsigned int prop) |
268 | { | |
269 | switch (prop) { | |
270 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
271 | return EXTCON_TYPE_USB; | |
272 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
273 | return EXTCON_TYPE_CHG; | |
274 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
275 | return EXTCON_TYPE_JACK; | |
276 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
277 | return EXTCON_TYPE_DISP; | |
278 | default: | |
279 | return -EINVAL; | |
280 | } | |
281 | } | |
282 | ||
283 | static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index) | |
284 | { | |
285 | return !!(edev->state & BIT(index)); | |
286 | } | |
287 | ||
ab11af04 CC |
288 | static bool is_extcon_changed(struct extcon_dev *edev, int index, |
289 | bool new_state) | |
046050f6 | 290 | { |
ab11af04 CC |
291 | int state = !!(edev->state & BIT(index)); |
292 | return (state != new_state); | |
046050f6 CC |
293 | } |
294 | ||
792e7e9e CC |
295 | static bool is_extcon_property_supported(unsigned int id, unsigned int prop) |
296 | { | |
297 | int type; | |
298 | ||
299 | /* Check whether the property is supported or not. */ | |
300 | type = get_extcon_type(prop); | |
301 | if (type < 0) | |
302 | return false; | |
303 | ||
304 | /* Check whether a specific extcon id supports the property or not. */ | |
305 | return !!(extcon_info[id].type & type); | |
306 | } | |
307 | ||
7f2a0a16 CC |
308 | static int is_extcon_property_capability(struct extcon_dev *edev, |
309 | unsigned int id, int index,unsigned int prop) | |
310 | { | |
311 | struct extcon_cable *cable; | |
312 | int type, ret; | |
313 | ||
314 | /* Check whether the property is supported or not. */ | |
315 | type = get_extcon_type(prop); | |
316 | if (type < 0) | |
317 | return type; | |
318 | ||
319 | cable = &edev->cables[index]; | |
320 | ||
321 | switch (type) { | |
322 | case EXTCON_TYPE_USB: | |
323 | ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
324 | break; | |
325 | case EXTCON_TYPE_CHG: | |
326 | ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
327 | break; | |
328 | case EXTCON_TYPE_JACK: | |
329 | ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
330 | break; | |
331 | case EXTCON_TYPE_DISP: | |
332 | ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
333 | break; | |
334 | default: | |
335 | ret = -EINVAL; | |
336 | } | |
337 | ||
338 | return ret; | |
339 | } | |
340 | ||
792e7e9e CC |
341 | static void init_property(struct extcon_dev *edev, unsigned int id, int index) |
342 | { | |
343 | unsigned int type = extcon_info[id].type; | |
344 | struct extcon_cable *cable = &edev->cables[index]; | |
345 | ||
346 | if (EXTCON_TYPE_USB & type) | |
347 | memset(cable->usb_propval, 0, sizeof(cable->usb_propval)); | |
348 | if (EXTCON_TYPE_CHG & type) | |
349 | memset(cable->chg_propval, 0, sizeof(cable->chg_propval)); | |
350 | if (EXTCON_TYPE_JACK & type) | |
351 | memset(cable->jack_propval, 0, sizeof(cable->jack_propval)); | |
352 | if (EXTCON_TYPE_DISP & type) | |
353 | memset(cable->disp_propval, 0, sizeof(cable->disp_propval)); | |
354 | } | |
355 | ||
de55d871 MH |
356 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
357 | char *buf) | |
358 | { | |
806d9dd7 | 359 | int i, count = 0; |
cb8bb3a7 | 360 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 361 | |
806d9dd7 MH |
362 | if (edev->max_supported == 0) |
363 | return sprintf(buf, "%u\n", edev->state); | |
364 | ||
2a9de9c0 | 365 | for (i = 0; i < edev->max_supported; i++) { |
806d9dd7 | 366 | count += sprintf(buf + count, "%s=%d\n", |
55e4e2f1 | 367 | extcon_info[edev->supported_cable[i]].name, |
70641a0a | 368 | !!(edev->state & BIT(i))); |
806d9dd7 MH |
369 | } |
370 | ||
371 | return count; | |
372 | } | |
5d5321e9 | 373 | static DEVICE_ATTR_RO(state); |
de55d871 MH |
374 | |
375 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
376 | char *buf) | |
377 | { | |
cb8bb3a7 | 378 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 379 | |
71c3ffa5 | 380 | return sprintf(buf, "%s\n", edev->name); |
de55d871 | 381 | } |
af01da0e | 382 | static DEVICE_ATTR_RO(name); |
de55d871 | 383 | |
806d9dd7 MH |
384 | static ssize_t cable_name_show(struct device *dev, |
385 | struct device_attribute *attr, char *buf) | |
386 | { | |
387 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
388 | attr_name); | |
2a9de9c0 | 389 | int i = cable->cable_index; |
806d9dd7 MH |
390 | |
391 | return sprintf(buf, "%s\n", | |
55e4e2f1 | 392 | extcon_info[cable->edev->supported_cable[i]].name); |
806d9dd7 MH |
393 | } |
394 | ||
395 | static ssize_t cable_state_show(struct device *dev, | |
396 | struct device_attribute *attr, char *buf) | |
397 | { | |
398 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
399 | attr_state); | |
400 | ||
be052cc8 RQ |
401 | int i = cable->cable_index; |
402 | ||
806d9dd7 | 403 | return sprintf(buf, "%d\n", |
575c2b86 | 404 | extcon_get_state(cable->edev, cable->edev->supported_cable[i])); |
806d9dd7 MH |
405 | } |
406 | ||
de55d871 | 407 | /** |
6ab6094f CC |
408 | * extcon_sync() - Synchronize the state for an external connector. |
409 | * @edev: the extcon device | |
410 | * | |
411 | * Note that this function send a notification in order to synchronize | |
412 | * the state and property of an external connector. | |
74c5d09b | 413 | * |
6ab6094f | 414 | * Returns 0 if success or error number if fail. |
de55d871 | 415 | */ |
ab11af04 | 416 | int extcon_sync(struct extcon_dev *edev, unsigned int id) |
de55d871 MH |
417 | { |
418 | char name_buf[120]; | |
419 | char state_buf[120]; | |
420 | char *prop_buf; | |
421 | char *envp[3]; | |
422 | int env_offset = 0; | |
423 | int length; | |
046050f6 | 424 | int index; |
ab11af04 | 425 | int state; |
806d9dd7 | 426 | unsigned long flags; |
de55d871 | 427 | |
7eae43ae CC |
428 | if (!edev) |
429 | return -EINVAL; | |
430 | ||
ab11af04 CC |
431 | index = find_cable_index_by_id(edev, id); |
432 | if (index < 0) | |
433 | return index; | |
434 | ||
806d9dd7 | 435 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 436 | |
ab11af04 | 437 | state = !!(edev->state & BIT(index)); |
815429b3 CC |
438 | |
439 | /* | |
440 | * Call functions in a raw notifier chain for the specific one | |
441 | * external connector. | |
442 | */ | |
ab11af04 CC |
443 | raw_notifier_call_chain(&edev->nh[index], state, edev); |
444 | ||
815429b3 CC |
445 | /* |
446 | * Call functions in a raw notifier chain for the all supported | |
447 | * external connectors. | |
448 | */ | |
449 | raw_notifier_call_chain(&edev->nh_all, state, edev); | |
450 | ||
ab11af04 CC |
451 | /* This could be in interrupt handler */ |
452 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
453 | if (!prop_buf) { | |
454 | /* Unlock early before uevent */ | |
806d9dd7 | 455 | spin_unlock_irqrestore(&edev->lock, flags); |
ab11af04 CC |
456 | |
457 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); | |
458 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
459 | ||
e7d9dd5a | 460 | return -ENOMEM; |
ab11af04 CC |
461 | } |
462 | ||
463 | length = name_show(&edev->dev, NULL, prop_buf); | |
464 | if (length > 0) { | |
465 | if (prop_buf[length - 1] == '\n') | |
466 | prop_buf[length - 1] = 0; | |
467 | snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf); | |
468 | envp[env_offset++] = name_buf; | |
469 | } | |
470 | ||
471 | length = state_show(&edev->dev, NULL, prop_buf); | |
472 | if (length > 0) { | |
473 | if (prop_buf[length - 1] == '\n') | |
474 | prop_buf[length - 1] = 0; | |
475 | snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf); | |
476 | envp[env_offset++] = state_buf; | |
de55d871 | 477 | } |
ab11af04 CC |
478 | envp[env_offset] = NULL; |
479 | ||
480 | /* Unlock early before uevent */ | |
481 | spin_unlock_irqrestore(&edev->lock, flags); | |
482 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); | |
483 | free_page((unsigned long)prop_buf); | |
bde68e60 MH |
484 | |
485 | return 0; | |
de55d871 | 486 | } |
ab11af04 | 487 | EXPORT_SYMBOL_GPL(extcon_sync); |
de55d871 | 488 | |
806d9dd7 | 489 | /** |
6ab6094f CC |
490 | * extcon_get_state() - Get the state of an external connector. |
491 | * @edev: the extcon device | |
492 | * @id: the unique id indicating an external connector | |
493 | * | |
494 | * Returns 0 if success or error number if fail. | |
806d9dd7 | 495 | */ |
575c2b86 | 496 | int extcon_get_state(struct extcon_dev *edev, const unsigned int id) |
806d9dd7 | 497 | { |
575c2b86 CC |
498 | int index, state; |
499 | unsigned long flags; | |
806d9dd7 | 500 | |
7eae43ae CC |
501 | if (!edev) |
502 | return -EINVAL; | |
503 | ||
2a9de9c0 CC |
504 | index = find_cable_index_by_id(edev, id); |
505 | if (index < 0) | |
506 | return index; | |
806d9dd7 | 507 | |
575c2b86 CC |
508 | spin_lock_irqsave(&edev->lock, flags); |
509 | state = is_extcon_attached(edev, index); | |
510 | spin_unlock_irqrestore(&edev->lock, flags); | |
806d9dd7 | 511 | |
575c2b86 | 512 | return state; |
806d9dd7 | 513 | } |
575c2b86 | 514 | EXPORT_SYMBOL_GPL(extcon_get_state); |
806d9dd7 | 515 | |
806d9dd7 | 516 | /** |
6ab6094f CC |
517 | * extcon_set_state() - Set the state of an external connector. |
518 | * @edev: the extcon device | |
519 | * @id: the unique id indicating an external connector | |
520 | * @state: the new state of an external connector. | |
521 | * the default semantics is true: attached / false: detached. | |
522 | * | |
523 | * Note that this function set the state of an external connector without | |
524 | * a notification. To synchronize the state of an external connector, | |
525 | * have to use extcon_set_state_sync() and extcon_sync(). | |
ab11af04 | 526 | * |
6ab6094f | 527 | * Returns 0 if success or error number if fail. |
806d9dd7 | 528 | */ |
6ab6094f | 529 | int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state) |
806d9dd7 | 530 | { |
ab11af04 CC |
531 | unsigned long flags; |
532 | int index, ret = 0; | |
806d9dd7 | 533 | |
7eae43ae CC |
534 | if (!edev) |
535 | return -EINVAL; | |
536 | ||
2a9de9c0 CC |
537 | index = find_cable_index_by_id(edev, id); |
538 | if (index < 0) | |
539 | return index; | |
540 | ||
ab11af04 CC |
541 | spin_lock_irqsave(&edev->lock, flags); |
542 | ||
543 | /* Check whether the external connector's state is changed. */ | |
6ab6094f | 544 | if (!is_extcon_changed(edev, index, state)) |
ab11af04 CC |
545 | goto out; |
546 | ||
547 | if (check_mutually_exclusive(edev, | |
6ab6094f | 548 | (edev->state & ~BIT(index)) | (state & BIT(index)))) { |
ab11af04 CC |
549 | ret = -EPERM; |
550 | goto out; | |
551 | } | |
552 | ||
792e7e9e CC |
553 | /* |
554 | * Initialize the value of extcon property before setting | |
555 | * the detached state for an external connector. | |
556 | */ | |
6ab6094f | 557 | if (!state) |
792e7e9e CC |
558 | init_property(edev, id, index); |
559 | ||
6ab6094f CC |
560 | /* Update the state for an external connector. */ |
561 | if (state) | |
ab11af04 CC |
562 | edev->state |= BIT(index); |
563 | else | |
564 | edev->state &= ~(BIT(index)); | |
565 | out: | |
566 | spin_unlock_irqrestore(&edev->lock, flags); | |
567 | ||
568 | return ret; | |
806d9dd7 | 569 | } |
575c2b86 | 570 | EXPORT_SYMBOL_GPL(extcon_set_state); |
806d9dd7 | 571 | |
ab11af04 | 572 | /** |
6ab6094f CC |
573 | * extcon_set_state_sync() - Set the state of an external connector with sync. |
574 | * @edev: the extcon device | |
575 | * @id: the unique id indicating an external connector | |
576 | * @state: the new state of external connector. | |
577 | * the default semantics is true: attached / false: detached. | |
578 | * | |
579 | * Note that this function set the state of external connector | |
580 | * and synchronize the state by sending a notification. | |
ab11af04 | 581 | * |
6ab6094f | 582 | * Returns 0 if success or error number if fail. |
ab11af04 | 583 | */ |
6ab6094f | 584 | int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state) |
ab11af04 CC |
585 | { |
586 | int ret, index; | |
587 | unsigned long flags; | |
588 | ||
589 | index = find_cable_index_by_id(edev, id); | |
590 | if (index < 0) | |
591 | return index; | |
592 | ||
593 | /* Check whether the external connector's state is changed. */ | |
594 | spin_lock_irqsave(&edev->lock, flags); | |
6ab6094f | 595 | ret = is_extcon_changed(edev, index, state); |
ab11af04 CC |
596 | spin_unlock_irqrestore(&edev->lock, flags); |
597 | if (!ret) | |
598 | return 0; | |
599 | ||
6ab6094f | 600 | ret = extcon_set_state(edev, id, state); |
ab11af04 CC |
601 | if (ret < 0) |
602 | return ret; | |
603 | ||
604 | return extcon_sync(edev, id); | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(extcon_set_state_sync); | |
607 | ||
792e7e9e | 608 | /** |
6ab6094f CC |
609 | * extcon_get_property() - Get the property value of an external connector. |
610 | * @edev: the extcon device | |
611 | * @id: the unique id indicating an external connector | |
612 | * @prop: the property id indicating an extcon property | |
613 | * @prop_val: the pointer which store the value of extcon property | |
792e7e9e | 614 | * |
6ab6094f CC |
615 | * Note that when getting the property value of external connector, |
616 | * the external connector should be attached. If detached state, function | |
617 | * return 0 without property value. Also, the each property should be | |
618 | * included in the list of supported properties according to extcon type. | |
792e7e9e | 619 | * |
6ab6094f | 620 | * Returns 0 if success or error number if fail. |
792e7e9e CC |
621 | */ |
622 | int extcon_get_property(struct extcon_dev *edev, unsigned int id, | |
623 | unsigned int prop, | |
624 | union extcon_property_value *prop_val) | |
625 | { | |
626 | struct extcon_cable *cable; | |
627 | unsigned long flags; | |
628 | int index, ret = 0; | |
629 | ||
630 | *prop_val = (union extcon_property_value)(0); | |
631 | ||
632 | if (!edev) | |
633 | return -EINVAL; | |
634 | ||
635 | /* Check whether the property is supported or not */ | |
636 | if (!is_extcon_property_supported(id, prop)) | |
637 | return -EINVAL; | |
638 | ||
639 | /* Find the cable index of external connector by using id */ | |
640 | index = find_cable_index_by_id(edev, id); | |
641 | if (index < 0) | |
642 | return index; | |
643 | ||
644 | spin_lock_irqsave(&edev->lock, flags); | |
645 | ||
7f2a0a16 CC |
646 | /* Check whether the property is available or not. */ |
647 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
648 | spin_unlock_irqrestore(&edev->lock, flags); | |
649 | return -EPERM; | |
650 | } | |
651 | ||
792e7e9e CC |
652 | /* |
653 | * Check whether the external connector is attached. | |
654 | * If external connector is detached, the user can not | |
655 | * get the property value. | |
656 | */ | |
657 | if (!is_extcon_attached(edev, index)) { | |
658 | spin_unlock_irqrestore(&edev->lock, flags); | |
659 | return 0; | |
660 | } | |
661 | ||
662 | cable = &edev->cables[index]; | |
663 | ||
664 | /* Get the property value according to extcon type */ | |
665 | switch (prop) { | |
666 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
667 | *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN]; | |
668 | break; | |
669 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
670 | *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN]; | |
671 | break; | |
672 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
673 | *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN]; | |
674 | break; | |
675 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
676 | *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN]; | |
677 | break; | |
678 | default: | |
679 | ret = -EINVAL; | |
680 | break; | |
681 | } | |
682 | ||
683 | spin_unlock_irqrestore(&edev->lock, flags); | |
684 | ||
685 | return ret; | |
686 | } | |
687 | EXPORT_SYMBOL_GPL(extcon_get_property); | |
688 | ||
689 | /** | |
6ab6094f CC |
690 | * extcon_set_property() - Set the property value of an external connector. |
691 | * @edev: the extcon device | |
692 | * @id: the unique id indicating an external connector | |
693 | * @prop: the property id indicating an extcon property | |
694 | * @prop_val: the pointer including the new value of extcon property | |
792e7e9e | 695 | * |
6ab6094f CC |
696 | * Note that each property should be included in the list of supported |
697 | * properties according to the extcon type. | |
792e7e9e | 698 | * |
6ab6094f | 699 | * Returns 0 if success or error number if fail. |
792e7e9e CC |
700 | */ |
701 | int extcon_set_property(struct extcon_dev *edev, unsigned int id, | |
702 | unsigned int prop, | |
703 | union extcon_property_value prop_val) | |
704 | { | |
705 | struct extcon_cable *cable; | |
706 | unsigned long flags; | |
707 | int index, ret = 0; | |
708 | ||
709 | if (!edev) | |
710 | return -EINVAL; | |
711 | ||
712 | /* Check whether the property is supported or not */ | |
713 | if (!is_extcon_property_supported(id, prop)) | |
714 | return -EINVAL; | |
715 | ||
716 | /* Find the cable index of external connector by using id */ | |
717 | index = find_cable_index_by_id(edev, id); | |
718 | if (index < 0) | |
719 | return index; | |
720 | ||
721 | spin_lock_irqsave(&edev->lock, flags); | |
722 | ||
7f2a0a16 CC |
723 | /* Check whether the property is available or not. */ |
724 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
725 | spin_unlock_irqrestore(&edev->lock, flags); | |
726 | return -EPERM; | |
727 | } | |
728 | ||
792e7e9e CC |
729 | cable = &edev->cables[index]; |
730 | ||
731 | /* Set the property value according to extcon type */ | |
732 | switch (prop) { | |
733 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
734 | cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val; | |
735 | break; | |
736 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
737 | cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val; | |
738 | break; | |
739 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
740 | cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val; | |
741 | break; | |
742 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
743 | cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val; | |
744 | break; | |
745 | default: | |
746 | ret = -EINVAL; | |
747 | break; | |
748 | } | |
749 | ||
750 | spin_unlock_irqrestore(&edev->lock, flags); | |
751 | ||
752 | return ret; | |
753 | } | |
754 | EXPORT_SYMBOL_GPL(extcon_set_property); | |
755 | ||
ab11af04 | 756 | /** |
6ab6094f CC |
757 | * extcon_set_property_sync() - Set property of an external connector with sync. |
758 | * @prop_val: the pointer including the new value of extcon property | |
ab11af04 | 759 | * |
6ab6094f CC |
760 | * Note that when setting the property value of external connector, |
761 | * the external connector should be attached. The each property should | |
762 | * be included in the list of supported properties according to extcon type. | |
ab11af04 | 763 | * |
6ab6094f | 764 | * Returns 0 if success or error number if fail. |
ab11af04 CC |
765 | */ |
766 | int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id, | |
767 | unsigned int prop, | |
768 | union extcon_property_value prop_val) | |
769 | { | |
770 | int ret; | |
771 | ||
772 | ret = extcon_set_property(edev, id, prop, prop_val); | |
773 | if (ret < 0) | |
774 | return ret; | |
775 | ||
776 | return extcon_sync(edev, id); | |
777 | } | |
778 | EXPORT_SYMBOL_GPL(extcon_set_property_sync); | |
779 | ||
7f2a0a16 | 780 | /** |
6ab6094f CC |
781 | * extcon_get_property_capability() - Get the capability of the property |
782 | * for an external connector. | |
783 | * @edev: the extcon device | |
784 | * @id: the unique id indicating an external connector | |
785 | * @prop: the property id indicating an extcon property | |
7f2a0a16 CC |
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 | /** | |
6ab6094f CC |
811 | * extcon_set_property_capability() - Set the capability of the property |
812 | * for an external connector. | |
813 | * @edev: the extcon device | |
814 | * @id: the unique id indicating an external connector | |
815 | * @prop: the property id indicating an extcon property | |
7f2a0a16 | 816 | * |
6ab6094f CC |
817 | * Note that this function set the capability of the property |
818 | * for an external connector in order to mark the bit in capability | |
819 | * bitmap which mean the available state of the property. | |
7f2a0a16 | 820 | * |
6ab6094f | 821 | * Returns 0 if success or error number if fail. |
7f2a0a16 CC |
822 | */ |
823 | int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id, | |
824 | unsigned int prop) | |
825 | { | |
826 | struct extcon_cable *cable; | |
827 | int index, type, ret = 0; | |
828 | ||
829 | if (!edev) | |
830 | return -EINVAL; | |
831 | ||
832 | /* Check whether the property is supported or not. */ | |
833 | if (!is_extcon_property_supported(id, prop)) | |
834 | return -EINVAL; | |
835 | ||
836 | /* Find the cable index of external connector by using id. */ | |
837 | index = find_cable_index_by_id(edev, id); | |
838 | if (index < 0) | |
839 | return index; | |
840 | ||
841 | type = get_extcon_type(prop); | |
842 | if (type < 0) | |
843 | return type; | |
844 | ||
845 | cable = &edev->cables[index]; | |
846 | ||
847 | switch (type) { | |
848 | case EXTCON_TYPE_USB: | |
849 | __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
850 | break; | |
851 | case EXTCON_TYPE_CHG: | |
852 | __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
853 | break; | |
854 | case EXTCON_TYPE_JACK: | |
855 | __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
856 | break; | |
857 | case EXTCON_TYPE_DISP: | |
858 | __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
859 | break; | |
860 | default: | |
861 | ret = -EINVAL; | |
862 | } | |
863 | ||
864 | return ret; | |
865 | } | |
866 | EXPORT_SYMBOL_GPL(extcon_set_property_capability); | |
867 | ||
74c5d09b | 868 | /** |
6ab6094f CC |
869 | * extcon_get_extcon_dev() - Get the extcon device instance from the name. |
870 | * @extcon_name: the extcon name provided with extcon_dev_register() | |
871 | * | |
872 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. | |
74c5d09b DK |
873 | */ |
874 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
875 | { | |
876 | struct extcon_dev *sd; | |
877 | ||
7eae43ae CC |
878 | if (!extcon_name) |
879 | return ERR_PTR(-EINVAL); | |
880 | ||
74c5d09b DK |
881 | mutex_lock(&extcon_dev_list_lock); |
882 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
883 | if (!strcmp(sd->name, extcon_name)) | |
884 | goto out; | |
885 | } | |
886 | sd = NULL; | |
887 | out: | |
888 | mutex_unlock(&extcon_dev_list_lock); | |
889 | return sd; | |
890 | } | |
891 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
892 | ||
893 | /** | |
6ab6094f CC |
894 | * extcon_register_notifier() - Register a notifier block to get notified by |
895 | * any state changes from the extcon. | |
896 | * @edev: the extcon device | |
897 | * @id: the unique id indicating an external connector | |
898 | * @nb: a notifier block to be registered | |
806d9dd7 MH |
899 | * |
900 | * Note that the second parameter given to the callback of nb (val) is | |
6ab6094f CC |
901 | * the current state of an external connector and the third pameter |
902 | * is the pointer of extcon device. | |
903 | * | |
904 | * Returns 0 if success or error number if fail. | |
74c5d09b | 905 | */ |
73b6ecdb | 906 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 907 | struct notifier_block *nb) |
74c5d09b | 908 | { |
66bee35f | 909 | unsigned long flags; |
2c8116a1 | 910 | int ret, idx = -EINVAL; |
046050f6 | 911 | |
01b4c9a1 | 912 | if (!edev || !nb) |
7eae43ae CC |
913 | return -EINVAL; |
914 | ||
01b4c9a1 CC |
915 | idx = find_cable_index_by_id(edev, id); |
916 | if (idx < 0) | |
917 | return idx; | |
66bee35f | 918 | |
01b4c9a1 CC |
919 | spin_lock_irqsave(&edev->lock, flags); |
920 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); | |
921 | spin_unlock_irqrestore(&edev->lock, flags); | |
66bee35f HG |
922 | |
923 | return ret; | |
74c5d09b DK |
924 | } |
925 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
926 | ||
927 | /** | |
6ab6094f CC |
928 | * extcon_unregister_notifier() - Unregister a notifier block from the extcon. |
929 | * @edev: the extcon device | |
930 | * @id: the unique id indicating an external connector | |
931 | * @nb: a notifier block to be registered | |
932 | * | |
933 | * Returns 0 if success or error number if fail. | |
74c5d09b | 934 | */ |
73b6ecdb | 935 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 936 | struct notifier_block *nb) |
74c5d09b | 937 | { |
66bee35f | 938 | unsigned long flags; |
046050f6 CC |
939 | int ret, idx; |
940 | ||
7eae43ae CC |
941 | if (!edev || !nb) |
942 | return -EINVAL; | |
943 | ||
046050f6 | 944 | idx = find_cable_index_by_id(edev, id); |
a05f44c8 SB |
945 | if (idx < 0) |
946 | return idx; | |
66bee35f HG |
947 | |
948 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 949 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
66bee35f HG |
950 | spin_unlock_irqrestore(&edev->lock, flags); |
951 | ||
952 | return ret; | |
74c5d09b DK |
953 | } |
954 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
955 | ||
815429b3 | 956 | /** |
6ab6094f CC |
957 | * extcon_register_notifier_all() - Register a notifier block for all connectors. |
958 | * @edev: the extcon device | |
959 | * @nb: a notifier block to be registered | |
815429b3 | 960 | * |
6ab6094f CC |
961 | * Note that this function registers a notifier block in order to receive |
962 | * the state change of all supported external connectors from extcon device. | |
826a47e9 | 963 | * And the second parameter given to the callback of nb (val) is |
6ab6094f | 964 | * the current state and the third pameter is the pointer of extcon device. |
815429b3 | 965 | * |
6ab6094f | 966 | * Returns 0 if success or error number if fail. |
815429b3 CC |
967 | */ |
968 | int extcon_register_notifier_all(struct extcon_dev *edev, | |
969 | struct notifier_block *nb) | |
970 | { | |
971 | unsigned long flags; | |
972 | int ret; | |
973 | ||
974 | if (!edev || !nb) | |
975 | return -EINVAL; | |
976 | ||
977 | spin_lock_irqsave(&edev->lock, flags); | |
978 | ret = raw_notifier_chain_register(&edev->nh_all, nb); | |
979 | spin_unlock_irqrestore(&edev->lock, flags); | |
980 | ||
981 | return ret; | |
982 | } | |
983 | EXPORT_SYMBOL_GPL(extcon_register_notifier_all); | |
984 | ||
985 | /** | |
986 | * extcon_unregister_notifier_all() - Unregister a notifier block from extcon. | |
6ab6094f CC |
987 | * @edev: the extcon device |
988 | * @nb: a notifier block to be registered | |
815429b3 | 989 | * |
6ab6094f | 990 | * Returns 0 if success or error number if fail. |
815429b3 CC |
991 | */ |
992 | int extcon_unregister_notifier_all(struct extcon_dev *edev, | |
993 | struct notifier_block *nb) | |
994 | { | |
995 | unsigned long flags; | |
996 | int ret; | |
997 | ||
998 | if (!edev || !nb) | |
999 | return -EINVAL; | |
1000 | ||
1001 | spin_lock_irqsave(&edev->lock, flags); | |
1002 | ret = raw_notifier_chain_unregister(&edev->nh_all, nb); | |
1003 | spin_unlock_irqrestore(&edev->lock, flags); | |
1004 | ||
1005 | return ret; | |
1006 | } | |
1007 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all); | |
1008 | ||
af01da0e GKH |
1009 | static struct attribute *extcon_attrs[] = { |
1010 | &dev_attr_state.attr, | |
1011 | &dev_attr_name.attr, | |
1012 | NULL, | |
de55d871 | 1013 | }; |
af01da0e | 1014 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
1015 | |
1016 | static int create_extcon_class(void) | |
1017 | { | |
1018 | if (!extcon_class) { | |
1019 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
1020 | if (IS_ERR(extcon_class)) | |
1021 | return PTR_ERR(extcon_class); | |
af01da0e | 1022 | extcon_class->dev_groups = extcon_groups; |
de55d871 MH |
1023 | } |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
de55d871 MH |
1028 | static void extcon_dev_release(struct device *dev) |
1029 | { | |
de55d871 MH |
1030 | } |
1031 | ||
bde68e60 | 1032 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
1033 | static void dummy_sysfs_dev_release(struct device *dev) |
1034 | { | |
1035 | } | |
1036 | ||
a9af6522 CC |
1037 | /* |
1038 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
6ab6094f CC |
1039 | * @supported_cable: the array of the supported external connectors |
1040 | * ending with EXTCON_NONE. | |
a9af6522 | 1041 | * |
6ab6094f CC |
1042 | * Note that this function allocates the memory for extcon device |
1043 | * and initialize default setting for the extcon device. | |
a9af6522 | 1044 | * |
6ab6094f CC |
1045 | * Returns the pointer memory of allocated extcon_dev if success |
1046 | * or ERR_PTR(err) if fail. | |
a9af6522 | 1047 | */ |
73b6ecdb | 1048 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
a9af6522 CC |
1049 | { |
1050 | struct extcon_dev *edev; | |
1051 | ||
7eae43ae CC |
1052 | if (!supported_cable) |
1053 | return ERR_PTR(-EINVAL); | |
1054 | ||
a9af6522 CC |
1055 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
1056 | if (!edev) | |
1057 | return ERR_PTR(-ENOMEM); | |
1058 | ||
1059 | edev->max_supported = 0; | |
1060 | edev->supported_cable = supported_cable; | |
1061 | ||
1062 | return edev; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * extcon_dev_free() - Free the memory of extcon device. | |
6ab6094f | 1067 | * @edev: the extcon device |
a9af6522 CC |
1068 | */ |
1069 | void extcon_dev_free(struct extcon_dev *edev) | |
1070 | { | |
1071 | kfree(edev); | |
1072 | } | |
1073 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
1074 | ||
de55d871 | 1075 | /** |
6ab6094f CC |
1076 | * extcon_dev_register() - Register an new extcon device |
1077 | * @edev: the extcon device to be registered | |
de55d871 MH |
1078 | * |
1079 | * Among the members of edev struct, please set the "user initializing data" | |
de55d871 MH |
1080 | * do not set the values of "internal data", which are initialized by |
1081 | * this function. | |
6ab6094f CC |
1082 | * |
1083 | * Note that before calling this funciton, have to allocate the memory | |
1084 | * of an extcon device by using the extcon_dev_allocate(). And the extcon | |
1085 | * dev should include the supported_cable information. | |
1086 | * | |
1087 | * Returns 0 if success or error number if fail. | |
de55d871 | 1088 | */ |
42d7d753 | 1089 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 1090 | { |
806d9dd7 | 1091 | int ret, index = 0; |
71c3ffa5 | 1092 | static atomic_t edev_no = ATOMIC_INIT(-1); |
de55d871 MH |
1093 | |
1094 | if (!extcon_class) { | |
1095 | ret = create_extcon_class(); | |
1096 | if (ret < 0) | |
1097 | return ret; | |
1098 | } | |
1099 | ||
7eae43ae | 1100 | if (!edev || !edev->supported_cable) |
2a9de9c0 CC |
1101 | return -EINVAL; |
1102 | ||
1103 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); | |
806d9dd7 | 1104 | |
2a9de9c0 | 1105 | edev->max_supported = index; |
806d9dd7 | 1106 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
1107 | dev_err(&edev->dev, |
1108 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
1109 | return -EINVAL; |
1110 | } | |
1111 | ||
dae61651 CC |
1112 | edev->dev.class = extcon_class; |
1113 | edev->dev.release = extcon_dev_release; | |
de55d871 | 1114 | |
71c3ffa5 | 1115 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
1116 | if (IS_ERR_OR_NULL(edev->name)) { |
1117 | dev_err(&edev->dev, | |
1118 | "extcon device name is null\n"); | |
1119 | return -EINVAL; | |
1120 | } | |
71c3ffa5 CC |
1121 | dev_set_name(&edev->dev, "extcon%lu", |
1122 | (unsigned long)atomic_inc_return(&edev_no)); | |
806d9dd7 MH |
1123 | |
1124 | if (edev->max_supported) { | |
1125 | char buf[10]; | |
1126 | char *str; | |
1127 | struct extcon_cable *cable; | |
1128 | ||
1129 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
1130 | edev->max_supported, GFP_KERNEL); | |
1131 | if (!edev->cables) { | |
1132 | ret = -ENOMEM; | |
1133 | goto err_sysfs_alloc; | |
1134 | } | |
1135 | for (index = 0; index < edev->max_supported; index++) { | |
1136 | cable = &edev->cables[index]; | |
1137 | ||
1138 | snprintf(buf, 10, "cable.%d", index); | |
1139 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
1140 | GFP_KERNEL); | |
1141 | if (!str) { | |
1142 | for (index--; index >= 0; index--) { | |
1143 | cable = &edev->cables[index]; | |
1144 | kfree(cable->attr_g.name); | |
1145 | } | |
1146 | ret = -ENOMEM; | |
1147 | ||
1148 | goto err_alloc_cables; | |
1149 | } | |
1150 | strcpy(str, buf); | |
1151 | ||
1152 | cable->edev = edev; | |
1153 | cable->cable_index = index; | |
1154 | cable->attrs[0] = &cable->attr_name.attr; | |
1155 | cable->attrs[1] = &cable->attr_state.attr; | |
1156 | cable->attrs[2] = NULL; | |
1157 | cable->attr_g.name = str; | |
1158 | cable->attr_g.attrs = cable->attrs; | |
1159 | ||
9baf3220 | 1160 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
1161 | cable->attr_name.attr.name = "name"; |
1162 | cable->attr_name.attr.mode = 0444; | |
1163 | cable->attr_name.show = cable_name_show; | |
1164 | ||
9baf3220 | 1165 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 1166 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 1167 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 1168 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
1169 | } |
1170 | } | |
1171 | ||
bde68e60 MH |
1172 | if (edev->max_supported && edev->mutually_exclusive) { |
1173 | char buf[80]; | |
1174 | char *name; | |
1175 | ||
1176 | /* Count the size of mutually_exclusive array */ | |
1177 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1178 | ; | |
1179 | ||
1180 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
1181 | (index + 1), GFP_KERNEL); | |
1182 | if (!edev->attrs_muex) { | |
1183 | ret = -ENOMEM; | |
1184 | goto err_muex; | |
1185 | } | |
1186 | ||
1187 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
1188 | index, GFP_KERNEL); | |
1189 | if (!edev->d_attrs_muex) { | |
1190 | ret = -ENOMEM; | |
1191 | kfree(edev->attrs_muex); | |
1192 | goto err_muex; | |
1193 | } | |
1194 | ||
1195 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
1196 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
1197 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
1198 | GFP_KERNEL); | |
1199 | if (!name) { | |
1200 | for (index--; index >= 0; index--) { | |
1201 | kfree(edev->d_attrs_muex[index].attr. | |
1202 | name); | |
1203 | } | |
1204 | kfree(edev->d_attrs_muex); | |
1205 | kfree(edev->attrs_muex); | |
1206 | ret = -ENOMEM; | |
1207 | goto err_muex; | |
1208 | } | |
1209 | strcpy(name, buf); | |
9baf3220 | 1210 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
1211 | edev->d_attrs_muex[index].attr.name = name; |
1212 | edev->d_attrs_muex[index].attr.mode = 0000; | |
1213 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
1214 | .attr; | |
1215 | } | |
1216 | edev->attr_g_muex.name = muex_name; | |
1217 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
1218 | ||
1219 | } | |
1220 | ||
806d9dd7 MH |
1221 | if (edev->max_supported) { |
1222 | edev->extcon_dev_type.groups = | |
1223 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 1224 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
1225 | if (!edev->extcon_dev_type.groups) { |
1226 | ret = -ENOMEM; | |
1227 | goto err_alloc_groups; | |
1228 | } | |
1229 | ||
dae61651 | 1230 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
1231 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
1232 | ||
1233 | for (index = 0; index < edev->max_supported; index++) | |
1234 | edev->extcon_dev_type.groups[index] = | |
1235 | &edev->cables[index].attr_g; | |
bde68e60 MH |
1236 | if (edev->mutually_exclusive) |
1237 | edev->extcon_dev_type.groups[index] = | |
1238 | &edev->attr_g_muex; | |
806d9dd7 | 1239 | |
dae61651 | 1240 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
1241 | } |
1242 | ||
dae61651 | 1243 | ret = device_register(&edev->dev); |
de55d871 | 1244 | if (ret) { |
dae61651 | 1245 | put_device(&edev->dev); |
de55d871 MH |
1246 | goto err_dev; |
1247 | } | |
de55d871 | 1248 | |
806d9dd7 | 1249 | spin_lock_init(&edev->lock); |
3f5071a8 ME |
1250 | edev->nh = devm_kcalloc(&edev->dev, edev->max_supported, |
1251 | sizeof(*edev->nh), GFP_KERNEL); | |
046050f6 CC |
1252 | if (!edev->nh) { |
1253 | ret = -ENOMEM; | |
1254 | goto err_dev; | |
1255 | } | |
1256 | ||
1257 | for (index = 0; index < edev->max_supported; index++) | |
1258 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); | |
74c5d09b | 1259 | |
815429b3 CC |
1260 | RAW_INIT_NOTIFIER_HEAD(&edev->nh_all); |
1261 | ||
dae61651 | 1262 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 1263 | edev->state = 0; |
74c5d09b DK |
1264 | |
1265 | mutex_lock(&extcon_dev_list_lock); | |
1266 | list_add(&edev->entry, &extcon_dev_list); | |
1267 | mutex_unlock(&extcon_dev_list_lock); | |
1268 | ||
de55d871 MH |
1269 | return 0; |
1270 | ||
1271 | err_dev: | |
806d9dd7 MH |
1272 | if (edev->max_supported) |
1273 | kfree(edev->extcon_dev_type.groups); | |
1274 | err_alloc_groups: | |
bde68e60 MH |
1275 | if (edev->max_supported && edev->mutually_exclusive) { |
1276 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1277 | kfree(edev->d_attrs_muex[index].attr.name); | |
1278 | kfree(edev->d_attrs_muex); | |
1279 | kfree(edev->attrs_muex); | |
1280 | } | |
1281 | err_muex: | |
806d9dd7 MH |
1282 | for (index = 0; index < edev->max_supported; index++) |
1283 | kfree(edev->cables[index].attr_g.name); | |
1284 | err_alloc_cables: | |
1285 | if (edev->max_supported) | |
1286 | kfree(edev->cables); | |
1287 | err_sysfs_alloc: | |
de55d871 MH |
1288 | return ret; |
1289 | } | |
1290 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
1291 | ||
1292 | /** | |
1293 | * extcon_dev_unregister() - Unregister the extcon device. | |
6ab6094f | 1294 | * @edev: the extcon device to be unregistered. |
de55d871 MH |
1295 | * |
1296 | * Note that this does not call kfree(edev) because edev was not allocated | |
1297 | * by this class. | |
1298 | */ | |
1299 | void extcon_dev_unregister(struct extcon_dev *edev) | |
1300 | { | |
57e7cd37 | 1301 | int index; |
1302 | ||
7eae43ae CC |
1303 | if (!edev) |
1304 | return; | |
1305 | ||
57e7cd37 | 1306 | mutex_lock(&extcon_dev_list_lock); |
1307 | list_del(&edev->entry); | |
1308 | mutex_unlock(&extcon_dev_list_lock); | |
1309 | ||
dae61651 CC |
1310 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
1311 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
1312 | dev_name(&edev->dev)); | |
57e7cd37 | 1313 | return; |
1314 | } | |
1315 | ||
7585ca0d WX |
1316 | device_unregister(&edev->dev); |
1317 | ||
57e7cd37 | 1318 | if (edev->mutually_exclusive && edev->max_supported) { |
1319 | for (index = 0; edev->mutually_exclusive[index]; | |
1320 | index++) | |
1321 | kfree(edev->d_attrs_muex[index].attr.name); | |
1322 | kfree(edev->d_attrs_muex); | |
1323 | kfree(edev->attrs_muex); | |
1324 | } | |
1325 | ||
1326 | for (index = 0; index < edev->max_supported; index++) | |
1327 | kfree(edev->cables[index].attr_g.name); | |
1328 | ||
1329 | if (edev->max_supported) { | |
1330 | kfree(edev->extcon_dev_type.groups); | |
1331 | kfree(edev->cables); | |
1332 | } | |
1333 | ||
dae61651 | 1334 | put_device(&edev->dev); |
de55d871 MH |
1335 | } |
1336 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
1337 | ||
1ad94ffe CC |
1338 | #ifdef CONFIG_OF |
1339 | /* | |
6ab6094f CC |
1340 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree. |
1341 | * @dev : the instance to the given device | |
1342 | * @index : the index into list of extcon_dev | |
1ad94ffe | 1343 | * |
6ab6094f | 1344 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. |
1ad94ffe CC |
1345 | */ |
1346 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1347 | { | |
1348 | struct device_node *node; | |
1349 | struct extcon_dev *edev; | |
1350 | ||
7eae43ae CC |
1351 | if (!dev) |
1352 | return ERR_PTR(-EINVAL); | |
1353 | ||
1ad94ffe | 1354 | if (!dev->of_node) { |
e8752b7a | 1355 | dev_dbg(dev, "device does not have a device node entry\n"); |
1ad94ffe CC |
1356 | return ERR_PTR(-EINVAL); |
1357 | } | |
1358 | ||
1359 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
1360 | if (!node) { | |
5c27036d RH |
1361 | dev_dbg(dev, "failed to get phandle in %pOF node\n", |
1362 | dev->of_node); | |
1ad94ffe CC |
1363 | return ERR_PTR(-ENODEV); |
1364 | } | |
1365 | ||
f841afb1 TF |
1366 | mutex_lock(&extcon_dev_list_lock); |
1367 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
1368 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
1369 | mutex_unlock(&extcon_dev_list_lock); | |
5d5c4c13 | 1370 | of_node_put(node); |
f841afb1 TF |
1371 | return edev; |
1372 | } | |
1ad94ffe | 1373 | } |
f841afb1 | 1374 | mutex_unlock(&extcon_dev_list_lock); |
5d5c4c13 | 1375 | of_node_put(node); |
1ad94ffe | 1376 | |
f841afb1 | 1377 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
1378 | } |
1379 | #else | |
1380 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1381 | { | |
1382 | return ERR_PTR(-ENOSYS); | |
1383 | } | |
1384 | #endif /* CONFIG_OF */ | |
1385 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
1386 | ||
707d7550 CC |
1387 | /** |
1388 | * extcon_get_edev_name() - Get the name of the extcon device. | |
1389 | * @edev: the extcon device | |
1390 | */ | |
1391 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
1392 | { | |
1393 | return !edev ? NULL : edev->name; | |
1394 | } | |
1395 | ||
de55d871 MH |
1396 | static int __init extcon_class_init(void) |
1397 | { | |
1398 | return create_extcon_class(); | |
1399 | } | |
1400 | module_init(extcon_class_init); | |
1401 | ||
1402 | static void __exit extcon_class_exit(void) | |
1403 | { | |
1404 | class_destroy(extcon_class); | |
1405 | } | |
1406 | module_exit(extcon_class_exit); | |
1407 | ||
2a9de9c0 | 1408 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 | 1409 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
6ab6094f CC |
1410 | MODULE_DESCRIPTION("External Connector (extcon) framework"); |
1411 | MODULE_LICENSE("GPL v2"); |