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Commit | Line | Data |
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de55d871 | 1 | /* |
b9ec23c0 | 2 | * drivers/extcon/extcon.c - External Connector (extcon) framework. |
de55d871 MH |
3 | * |
4 | * External connector (extcon) class driver | |
5 | * | |
2a9de9c0 CC |
6 | * Copyright (C) 2015 Samsung Electronics |
7 | * Author: Chanwoo Choi <cw00.choi@samsung.com> | |
8 | * | |
de55d871 MH |
9 | * Copyright (C) 2012 Samsung Electronics |
10 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
11 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
12 | * | |
13 | * based on android/drivers/switch/switch_class.c | |
14 | * Copyright (C) 2008 Google, Inc. | |
15 | * Author: Mike Lockwood <lockwood@android.com> | |
16 | * | |
17 | * This software is licensed under the terms of the GNU General Public | |
18 | * License version 2, as published by the Free Software Foundation, and | |
19 | * may be copied, distributed, and modified under those terms. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
b9ec23c0 | 25 | */ |
de55d871 MH |
26 | |
27 | #include <linux/module.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/fs.h> | |
32 | #include <linux/err.h> | |
f841afb1 | 33 | #include <linux/of.h> |
de55d871 | 34 | #include <linux/slab.h> |
9baf3220 | 35 | #include <linux/sysfs.h> |
de55d871 | 36 | |
e6cf0465 CC |
37 | #include "extcon.h" |
38 | ||
2a9de9c0 CC |
39 | #define SUPPORTED_CABLE_MAX 32 |
40 | #define CABLE_NAME_MAX 30 | |
41 | ||
55e4e2f1 CC |
42 | struct __extcon_info { |
43 | unsigned int type; | |
44 | unsigned int id; | |
45 | const char *name; | |
46 | ||
47 | } extcon_info[] = { | |
48 | [EXTCON_NONE] = { | |
49 | .type = EXTCON_TYPE_MISC, | |
50 | .id = EXTCON_NONE, | |
51 | .name = "NONE", | |
52 | }, | |
73b6ecdb | 53 | |
8e9bc36d | 54 | /* USB external connector */ |
55e4e2f1 CC |
55 | [EXTCON_USB] = { |
56 | .type = EXTCON_TYPE_USB, | |
57 | .id = EXTCON_USB, | |
58 | .name = "USB", | |
59 | }, | |
60 | [EXTCON_USB_HOST] = { | |
61 | .type = EXTCON_TYPE_USB, | |
62 | .id = EXTCON_USB_HOST, | |
86d6cda6 | 63 | .name = "USB-HOST", |
55e4e2f1 | 64 | }, |
8e9bc36d | 65 | |
11eecf91 | 66 | /* Charging external connector */ |
55e4e2f1 CC |
67 | [EXTCON_CHG_USB_SDP] = { |
68 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
69 | .id = EXTCON_CHG_USB_SDP, | |
70 | .name = "SDP", | |
71 | }, | |
72 | [EXTCON_CHG_USB_DCP] = { | |
73 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
74 | .id = EXTCON_CHG_USB_DCP, | |
75 | .name = "DCP", | |
76 | }, | |
77 | [EXTCON_CHG_USB_CDP] = { | |
78 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
79 | .id = EXTCON_CHG_USB_CDP, | |
80 | .name = "CDP", | |
81 | }, | |
82 | [EXTCON_CHG_USB_ACA] = { | |
83 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
84 | .id = EXTCON_CHG_USB_ACA, | |
85 | .name = "ACA", | |
86 | }, | |
87 | [EXTCON_CHG_USB_FAST] = { | |
88 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
89 | .id = EXTCON_CHG_USB_FAST, | |
90 | .name = "FAST-CHARGER", | |
91 | }, | |
92 | [EXTCON_CHG_USB_SLOW] = { | |
93 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
94 | .id = EXTCON_CHG_USB_SLOW, | |
95 | .name = "SLOW-CHARGER", | |
96 | }, | |
7fe95fb8 CC |
97 | [EXTCON_CHG_WPT] = { |
98 | .type = EXTCON_TYPE_CHG, | |
99 | .id = EXTCON_CHG_WPT, | |
100 | .name = "WPT", | |
101 | }, | |
3c5f0e07 CC |
102 | [EXTCON_CHG_USB_PD] = { |
103 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
104 | .id = EXTCON_CHG_USB_PD, | |
105 | .name = "PD", | |
106 | }, | |
8e9bc36d | 107 | |
11eecf91 | 108 | /* Jack external connector */ |
55e4e2f1 CC |
109 | [EXTCON_JACK_MICROPHONE] = { |
110 | .type = EXTCON_TYPE_JACK, | |
111 | .id = EXTCON_JACK_MICROPHONE, | |
112 | .name = "MICROPHONE", | |
113 | }, | |
114 | [EXTCON_JACK_HEADPHONE] = { | |
115 | .type = EXTCON_TYPE_JACK, | |
116 | .id = EXTCON_JACK_HEADPHONE, | |
117 | .name = "HEADPHONE", | |
118 | }, | |
119 | [EXTCON_JACK_LINE_IN] = { | |
120 | .type = EXTCON_TYPE_JACK, | |
121 | .id = EXTCON_JACK_LINE_IN, | |
122 | .name = "LINE-IN", | |
123 | }, | |
124 | [EXTCON_JACK_LINE_OUT] = { | |
125 | .type = EXTCON_TYPE_JACK, | |
126 | .id = EXTCON_JACK_LINE_OUT, | |
127 | .name = "LINE-OUT", | |
128 | }, | |
129 | [EXTCON_JACK_VIDEO_IN] = { | |
130 | .type = EXTCON_TYPE_JACK, | |
131 | .id = EXTCON_JACK_VIDEO_IN, | |
132 | .name = "VIDEO-IN", | |
133 | }, | |
134 | [EXTCON_JACK_VIDEO_OUT] = { | |
135 | .type = EXTCON_TYPE_JACK, | |
136 | .id = EXTCON_JACK_VIDEO_OUT, | |
137 | .name = "VIDEO-OUT", | |
138 | }, | |
139 | [EXTCON_JACK_SPDIF_IN] = { | |
140 | .type = EXTCON_TYPE_JACK, | |
141 | .id = EXTCON_JACK_SPDIF_IN, | |
142 | .name = "SPDIF-IN", | |
143 | }, | |
144 | [EXTCON_JACK_SPDIF_OUT] = { | |
145 | .type = EXTCON_TYPE_JACK, | |
146 | .id = EXTCON_JACK_SPDIF_OUT, | |
147 | .name = "SPDIF-OUT", | |
148 | }, | |
8e9bc36d | 149 | |
11eecf91 | 150 | /* Display external connector */ |
55e4e2f1 CC |
151 | [EXTCON_DISP_HDMI] = { |
152 | .type = EXTCON_TYPE_DISP, | |
153 | .id = EXTCON_DISP_HDMI, | |
154 | .name = "HDMI", | |
155 | }, | |
156 | [EXTCON_DISP_MHL] = { | |
157 | .type = EXTCON_TYPE_DISP, | |
158 | .id = EXTCON_DISP_MHL, | |
159 | .name = "MHL", | |
160 | }, | |
161 | [EXTCON_DISP_DVI] = { | |
162 | .type = EXTCON_TYPE_DISP, | |
163 | .id = EXTCON_DISP_DVI, | |
164 | .name = "DVI", | |
165 | }, | |
166 | [EXTCON_DISP_VGA] = { | |
167 | .type = EXTCON_TYPE_DISP, | |
168 | .id = EXTCON_DISP_VGA, | |
169 | .name = "VGA", | |
170 | }, | |
2164188d CZ |
171 | [EXTCON_DISP_DP] = { |
172 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
173 | .id = EXTCON_DISP_DP, | |
174 | .name = "DP", | |
175 | }, | |
9c0595d6 CC |
176 | [EXTCON_DISP_HMD] = { |
177 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
178 | .id = EXTCON_DISP_HMD, | |
179 | .name = "HMD", | |
180 | }, | |
8e9bc36d | 181 | |
11eecf91 | 182 | /* Miscellaneous external connector */ |
55e4e2f1 CC |
183 | [EXTCON_DOCK] = { |
184 | .type = EXTCON_TYPE_MISC, | |
185 | .id = EXTCON_DOCK, | |
186 | .name = "DOCK", | |
187 | }, | |
188 | [EXTCON_JIG] = { | |
189 | .type = EXTCON_TYPE_MISC, | |
190 | .id = EXTCON_JIG, | |
191 | .name = "JIG", | |
192 | }, | |
193 | [EXTCON_MECHANICAL] = { | |
194 | .type = EXTCON_TYPE_MISC, | |
195 | .id = EXTCON_MECHANICAL, | |
196 | .name = "MECHANICAL", | |
197 | }, | |
198 | ||
199 | { /* sentinel */ } | |
806d9dd7 MH |
200 | }; |
201 | ||
20f7b53d CC |
202 | /** |
203 | * struct extcon_cable - An internal data for each cable of extcon device. | |
204 | * @edev: The extcon device | |
205 | * @cable_index: Index of this cable in the edev | |
206 | * @attr_g: Attribute group for the cable | |
207 | * @attr_name: "name" sysfs entry | |
208 | * @attr_state: "state" sysfs entry | |
209 | * @attrs: Array pointing to attr_name and attr_state for attr_g | |
210 | */ | |
211 | struct extcon_cable { | |
212 | struct extcon_dev *edev; | |
213 | int cable_index; | |
214 | ||
215 | struct attribute_group attr_g; | |
216 | struct device_attribute attr_name; | |
217 | struct device_attribute attr_state; | |
218 | ||
219 | struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ | |
792e7e9e CC |
220 | |
221 | union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT]; | |
222 | union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT]; | |
223 | union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT]; | |
224 | union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT]; | |
7f2a0a16 CC |
225 | |
226 | unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)]; | |
227 | unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)]; | |
228 | unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)]; | |
229 | unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)]; | |
20f7b53d CC |
230 | }; |
231 | ||
be3a07f7 | 232 | static struct class *extcon_class; |
de55d871 | 233 | |
74c5d09b DK |
234 | static LIST_HEAD(extcon_dev_list); |
235 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
236 | ||
bde68e60 MH |
237 | /** |
238 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
a75e1c73 | 239 | * condition. |
bde68e60 MH |
240 | * @edev: the extcon device |
241 | * @new_state: new cable attach status for @edev | |
242 | * | |
243 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
244 | * violated condition. | |
245 | */ | |
246 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
247 | { | |
248 | int i = 0; | |
249 | ||
250 | if (!edev->mutually_exclusive) | |
251 | return 0; | |
252 | ||
253 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 254 | int weight; |
bde68e60 | 255 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 256 | |
28c0ada6 | 257 | /* calculate the total number of bits set */ |
258 | weight = hweight32(correspondants); | |
259 | if (weight > 1) | |
260 | return i + 1; | |
bde68e60 MH |
261 | } |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
73b6ecdb | 266 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
2a9de9c0 CC |
267 | { |
268 | int i; | |
269 | ||
270 | /* Find the the index of extcon cable in edev->supported_cable */ | |
271 | for (i = 0; i < edev->max_supported; i++) { | |
272 | if (edev->supported_cable[i] == id) | |
273 | return i; | |
274 | } | |
275 | ||
276 | return -EINVAL; | |
277 | } | |
278 | ||
792e7e9e CC |
279 | static int get_extcon_type(unsigned int prop) |
280 | { | |
281 | switch (prop) { | |
282 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
283 | return EXTCON_TYPE_USB; | |
284 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
285 | return EXTCON_TYPE_CHG; | |
286 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
287 | return EXTCON_TYPE_JACK; | |
288 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
289 | return EXTCON_TYPE_DISP; | |
290 | default: | |
291 | return -EINVAL; | |
292 | } | |
293 | } | |
294 | ||
295 | static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index) | |
296 | { | |
297 | return !!(edev->state & BIT(index)); | |
298 | } | |
299 | ||
ab11af04 CC |
300 | static bool is_extcon_changed(struct extcon_dev *edev, int index, |
301 | bool new_state) | |
046050f6 | 302 | { |
ab11af04 CC |
303 | int state = !!(edev->state & BIT(index)); |
304 | return (state != new_state); | |
046050f6 CC |
305 | } |
306 | ||
792e7e9e CC |
307 | static bool is_extcon_property_supported(unsigned int id, unsigned int prop) |
308 | { | |
309 | int type; | |
310 | ||
311 | /* Check whether the property is supported or not. */ | |
312 | type = get_extcon_type(prop); | |
313 | if (type < 0) | |
314 | return false; | |
315 | ||
316 | /* Check whether a specific extcon id supports the property or not. */ | |
317 | return !!(extcon_info[id].type & type); | |
318 | } | |
319 | ||
7f2a0a16 CC |
320 | static int is_extcon_property_capability(struct extcon_dev *edev, |
321 | unsigned int id, int index,unsigned int prop) | |
322 | { | |
323 | struct extcon_cable *cable; | |
324 | int type, ret; | |
325 | ||
326 | /* Check whether the property is supported or not. */ | |
327 | type = get_extcon_type(prop); | |
328 | if (type < 0) | |
329 | return type; | |
330 | ||
331 | cable = &edev->cables[index]; | |
332 | ||
333 | switch (type) { | |
334 | case EXTCON_TYPE_USB: | |
335 | ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
336 | break; | |
337 | case EXTCON_TYPE_CHG: | |
338 | ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
339 | break; | |
340 | case EXTCON_TYPE_JACK: | |
341 | ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
342 | break; | |
343 | case EXTCON_TYPE_DISP: | |
344 | ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
345 | break; | |
346 | default: | |
347 | ret = -EINVAL; | |
348 | } | |
349 | ||
350 | return ret; | |
351 | } | |
352 | ||
792e7e9e CC |
353 | static void init_property(struct extcon_dev *edev, unsigned int id, int index) |
354 | { | |
355 | unsigned int type = extcon_info[id].type; | |
356 | struct extcon_cable *cable = &edev->cables[index]; | |
357 | ||
358 | if (EXTCON_TYPE_USB & type) | |
359 | memset(cable->usb_propval, 0, sizeof(cable->usb_propval)); | |
360 | if (EXTCON_TYPE_CHG & type) | |
361 | memset(cable->chg_propval, 0, sizeof(cable->chg_propval)); | |
362 | if (EXTCON_TYPE_JACK & type) | |
363 | memset(cable->jack_propval, 0, sizeof(cable->jack_propval)); | |
364 | if (EXTCON_TYPE_DISP & type) | |
365 | memset(cable->disp_propval, 0, sizeof(cable->disp_propval)); | |
366 | } | |
367 | ||
de55d871 MH |
368 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
369 | char *buf) | |
370 | { | |
806d9dd7 | 371 | int i, count = 0; |
cb8bb3a7 | 372 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 373 | |
806d9dd7 MH |
374 | if (edev->max_supported == 0) |
375 | return sprintf(buf, "%u\n", edev->state); | |
376 | ||
2a9de9c0 | 377 | for (i = 0; i < edev->max_supported; i++) { |
806d9dd7 | 378 | count += sprintf(buf + count, "%s=%d\n", |
55e4e2f1 | 379 | extcon_info[edev->supported_cable[i]].name, |
70641a0a | 380 | !!(edev->state & BIT(i))); |
806d9dd7 MH |
381 | } |
382 | ||
383 | return count; | |
384 | } | |
5d5321e9 | 385 | static DEVICE_ATTR_RO(state); |
de55d871 MH |
386 | |
387 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
388 | char *buf) | |
389 | { | |
cb8bb3a7 | 390 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 391 | |
71c3ffa5 | 392 | return sprintf(buf, "%s\n", edev->name); |
de55d871 | 393 | } |
af01da0e | 394 | static DEVICE_ATTR_RO(name); |
de55d871 | 395 | |
806d9dd7 MH |
396 | static ssize_t cable_name_show(struct device *dev, |
397 | struct device_attribute *attr, char *buf) | |
398 | { | |
399 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
400 | attr_name); | |
2a9de9c0 | 401 | int i = cable->cable_index; |
806d9dd7 MH |
402 | |
403 | return sprintf(buf, "%s\n", | |
55e4e2f1 | 404 | extcon_info[cable->edev->supported_cable[i]].name); |
806d9dd7 MH |
405 | } |
406 | ||
407 | static ssize_t cable_state_show(struct device *dev, | |
408 | struct device_attribute *attr, char *buf) | |
409 | { | |
410 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
411 | attr_state); | |
412 | ||
be052cc8 RQ |
413 | int i = cable->cable_index; |
414 | ||
806d9dd7 | 415 | return sprintf(buf, "%d\n", |
575c2b86 | 416 | extcon_get_state(cable->edev, cable->edev->supported_cable[i])); |
806d9dd7 MH |
417 | } |
418 | ||
de55d871 | 419 | /** |
ab11af04 CC |
420 | * extcon_sync() - Synchronize the states for both the attached/detached |
421 | * @edev: the extcon device that has the cable. | |
74c5d09b | 422 | * |
ab11af04 CC |
423 | * This function send a notification to synchronize the all states of a |
424 | * specific external connector | |
de55d871 | 425 | */ |
ab11af04 | 426 | int extcon_sync(struct extcon_dev *edev, unsigned int id) |
de55d871 MH |
427 | { |
428 | char name_buf[120]; | |
429 | char state_buf[120]; | |
430 | char *prop_buf; | |
431 | char *envp[3]; | |
432 | int env_offset = 0; | |
433 | int length; | |
046050f6 | 434 | int index; |
ab11af04 | 435 | int state; |
806d9dd7 | 436 | unsigned long flags; |
de55d871 | 437 | |
7eae43ae CC |
438 | if (!edev) |
439 | return -EINVAL; | |
440 | ||
ab11af04 CC |
441 | index = find_cable_index_by_id(edev, id); |
442 | if (index < 0) | |
443 | return index; | |
444 | ||
806d9dd7 | 445 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 446 | |
ab11af04 | 447 | state = !!(edev->state & BIT(index)); |
815429b3 CC |
448 | |
449 | /* | |
450 | * Call functions in a raw notifier chain for the specific one | |
451 | * external connector. | |
452 | */ | |
ab11af04 CC |
453 | raw_notifier_call_chain(&edev->nh[index], state, edev); |
454 | ||
815429b3 CC |
455 | /* |
456 | * Call functions in a raw notifier chain for the all supported | |
457 | * external connectors. | |
458 | */ | |
459 | raw_notifier_call_chain(&edev->nh_all, state, edev); | |
460 | ||
ab11af04 CC |
461 | /* This could be in interrupt handler */ |
462 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
463 | if (!prop_buf) { | |
464 | /* Unlock early before uevent */ | |
806d9dd7 | 465 | spin_unlock_irqrestore(&edev->lock, flags); |
ab11af04 CC |
466 | |
467 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); | |
468 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
469 | ||
e7d9dd5a | 470 | return -ENOMEM; |
ab11af04 CC |
471 | } |
472 | ||
473 | length = name_show(&edev->dev, NULL, prop_buf); | |
474 | if (length > 0) { | |
475 | if (prop_buf[length - 1] == '\n') | |
476 | prop_buf[length - 1] = 0; | |
477 | snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf); | |
478 | envp[env_offset++] = name_buf; | |
479 | } | |
480 | ||
481 | length = state_show(&edev->dev, NULL, prop_buf); | |
482 | if (length > 0) { | |
483 | if (prop_buf[length - 1] == '\n') | |
484 | prop_buf[length - 1] = 0; | |
485 | snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf); | |
486 | envp[env_offset++] = state_buf; | |
de55d871 | 487 | } |
ab11af04 CC |
488 | envp[env_offset] = NULL; |
489 | ||
490 | /* Unlock early before uevent */ | |
491 | spin_unlock_irqrestore(&edev->lock, flags); | |
492 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); | |
493 | free_page((unsigned long)prop_buf); | |
bde68e60 MH |
494 | |
495 | return 0; | |
de55d871 | 496 | } |
ab11af04 | 497 | EXPORT_SYMBOL_GPL(extcon_sync); |
de55d871 | 498 | |
806d9dd7 | 499 | /** |
575c2b86 | 500 | * extcon_get_state() - Get the state of a external connector. |
806d9dd7 | 501 | * @edev: the extcon device that has the cable. |
2a9de9c0 | 502 | * @id: the unique id of each external connector in extcon enumeration. |
806d9dd7 | 503 | */ |
575c2b86 | 504 | int extcon_get_state(struct extcon_dev *edev, const unsigned int id) |
806d9dd7 | 505 | { |
575c2b86 CC |
506 | int index, state; |
507 | unsigned long flags; | |
806d9dd7 | 508 | |
7eae43ae CC |
509 | if (!edev) |
510 | return -EINVAL; | |
511 | ||
2a9de9c0 CC |
512 | index = find_cable_index_by_id(edev, id); |
513 | if (index < 0) | |
514 | return index; | |
806d9dd7 | 515 | |
575c2b86 CC |
516 | spin_lock_irqsave(&edev->lock, flags); |
517 | state = is_extcon_attached(edev, index); | |
518 | spin_unlock_irqrestore(&edev->lock, flags); | |
806d9dd7 | 519 | |
575c2b86 | 520 | return state; |
806d9dd7 | 521 | } |
575c2b86 | 522 | EXPORT_SYMBOL_GPL(extcon_get_state); |
806d9dd7 | 523 | |
806d9dd7 | 524 | /** |
575c2b86 | 525 | * extcon_set_state() - Set the state of a external connector. |
ab11af04 | 526 | * without a notification. |
a75e1c73 | 527 | * @edev: the extcon device that has the cable. |
2a9de9c0 CC |
528 | * @id: the unique id of each external connector |
529 | * in extcon enumeration. | |
530 | * @state: the new cable status. The default semantics is | |
806d9dd7 | 531 | * true: attached / false: detached. |
ab11af04 CC |
532 | * |
533 | * This function only set the state of a external connector without | |
534 | * a notification. To synchronize the data of a external connector, | |
535 | * use extcon_set_state_sync() and extcon_sync(). | |
806d9dd7 | 536 | */ |
575c2b86 | 537 | int extcon_set_state(struct extcon_dev *edev, unsigned int id, |
2a9de9c0 | 538 | bool cable_state) |
806d9dd7 | 539 | { |
ab11af04 CC |
540 | unsigned long flags; |
541 | int index, ret = 0; | |
806d9dd7 | 542 | |
7eae43ae CC |
543 | if (!edev) |
544 | return -EINVAL; | |
545 | ||
2a9de9c0 CC |
546 | index = find_cable_index_by_id(edev, id); |
547 | if (index < 0) | |
548 | return index; | |
549 | ||
ab11af04 CC |
550 | spin_lock_irqsave(&edev->lock, flags); |
551 | ||
552 | /* Check whether the external connector's state is changed. */ | |
553 | if (!is_extcon_changed(edev, index, cable_state)) | |
554 | goto out; | |
555 | ||
556 | if (check_mutually_exclusive(edev, | |
557 | (edev->state & ~BIT(index)) | (cable_state & BIT(index)))) { | |
558 | ret = -EPERM; | |
559 | goto out; | |
560 | } | |
561 | ||
792e7e9e CC |
562 | /* |
563 | * Initialize the value of extcon property before setting | |
564 | * the detached state for an external connector. | |
565 | */ | |
566 | if (!cable_state) | |
567 | init_property(edev, id, index); | |
568 | ||
ab11af04 CC |
569 | /* Update the state for a external connector. */ |
570 | if (cable_state) | |
571 | edev->state |= BIT(index); | |
572 | else | |
573 | edev->state &= ~(BIT(index)); | |
574 | out: | |
575 | spin_unlock_irqrestore(&edev->lock, flags); | |
576 | ||
577 | return ret; | |
806d9dd7 | 578 | } |
575c2b86 | 579 | EXPORT_SYMBOL_GPL(extcon_set_state); |
806d9dd7 | 580 | |
ab11af04 CC |
581 | /** |
582 | * extcon_set_state_sync() - Set the state of a external connector | |
583 | * with a notification. | |
584 | * @edev: the extcon device that has the cable. | |
585 | * @id: the unique id of each external connector | |
586 | * in extcon enumeration. | |
587 | * @state: the new cable status. The default semantics is | |
588 | * true: attached / false: detached. | |
589 | * | |
590 | * This function set the state of external connector and synchronize the data | |
591 | * by usning a notification. | |
592 | */ | |
593 | int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, | |
594 | bool cable_state) | |
595 | { | |
596 | int ret, index; | |
597 | unsigned long flags; | |
598 | ||
599 | index = find_cable_index_by_id(edev, id); | |
600 | if (index < 0) | |
601 | return index; | |
602 | ||
603 | /* Check whether the external connector's state is changed. */ | |
604 | spin_lock_irqsave(&edev->lock, flags); | |
605 | ret = is_extcon_changed(edev, index, cable_state); | |
606 | spin_unlock_irqrestore(&edev->lock, flags); | |
607 | if (!ret) | |
608 | return 0; | |
609 | ||
610 | ret = extcon_set_state(edev, id, cable_state); | |
611 | if (ret < 0) | |
612 | return ret; | |
613 | ||
614 | return extcon_sync(edev, id); | |
615 | } | |
616 | EXPORT_SYMBOL_GPL(extcon_set_state_sync); | |
617 | ||
792e7e9e CC |
618 | /** |
619 | * extcon_get_property() - Get the property value of a specific cable. | |
620 | * @edev: the extcon device that has the cable. | |
621 | * @id: the unique id of each external connector | |
622 | * in extcon enumeration. | |
623 | * @prop: the property id among enum extcon_property. | |
624 | * @prop_val: the pointer which store the value of property. | |
625 | * | |
626 | * When getting the property value of external connector, the external connector | |
627 | * should be attached. If detached state, function just return 0 without | |
628 | * property value. Also, the each property should be included in the list of | |
629 | * supported properties according to the type of external connectors. | |
630 | * | |
631 | * Returns 0 if success or error number if fail | |
632 | */ | |
633 | int extcon_get_property(struct extcon_dev *edev, unsigned int id, | |
634 | unsigned int prop, | |
635 | union extcon_property_value *prop_val) | |
636 | { | |
637 | struct extcon_cable *cable; | |
638 | unsigned long flags; | |
639 | int index, ret = 0; | |
640 | ||
641 | *prop_val = (union extcon_property_value)(0); | |
642 | ||
643 | if (!edev) | |
644 | return -EINVAL; | |
645 | ||
646 | /* Check whether the property is supported or not */ | |
647 | if (!is_extcon_property_supported(id, prop)) | |
648 | return -EINVAL; | |
649 | ||
650 | /* Find the cable index of external connector by using id */ | |
651 | index = find_cable_index_by_id(edev, id); | |
652 | if (index < 0) | |
653 | return index; | |
654 | ||
655 | spin_lock_irqsave(&edev->lock, flags); | |
656 | ||
7f2a0a16 CC |
657 | /* Check whether the property is available or not. */ |
658 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
659 | spin_unlock_irqrestore(&edev->lock, flags); | |
660 | return -EPERM; | |
661 | } | |
662 | ||
792e7e9e CC |
663 | /* |
664 | * Check whether the external connector is attached. | |
665 | * If external connector is detached, the user can not | |
666 | * get the property value. | |
667 | */ | |
668 | if (!is_extcon_attached(edev, index)) { | |
669 | spin_unlock_irqrestore(&edev->lock, flags); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | cable = &edev->cables[index]; | |
674 | ||
675 | /* Get the property value according to extcon type */ | |
676 | switch (prop) { | |
677 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
678 | *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN]; | |
679 | break; | |
680 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
681 | *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN]; | |
682 | break; | |
683 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
684 | *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN]; | |
685 | break; | |
686 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
687 | *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN]; | |
688 | break; | |
689 | default: | |
690 | ret = -EINVAL; | |
691 | break; | |
692 | } | |
693 | ||
694 | spin_unlock_irqrestore(&edev->lock, flags); | |
695 | ||
696 | return ret; | |
697 | } | |
698 | EXPORT_SYMBOL_GPL(extcon_get_property); | |
699 | ||
700 | /** | |
701 | * extcon_set_property() - Set the property value of a specific cable. | |
702 | * @edev: the extcon device that has the cable. | |
703 | * @id: the unique id of each external connector | |
704 | * in extcon enumeration. | |
705 | * @prop: the property id among enum extcon_property. | |
706 | * @prop_val: the pointer including the new value of property. | |
707 | * | |
708 | * The each property should be included in the list of supported properties | |
709 | * according to the type of external connectors. | |
710 | * | |
711 | * Returns 0 if success or error number if fail | |
712 | */ | |
713 | int extcon_set_property(struct extcon_dev *edev, unsigned int id, | |
714 | unsigned int prop, | |
715 | union extcon_property_value prop_val) | |
716 | { | |
717 | struct extcon_cable *cable; | |
718 | unsigned long flags; | |
719 | int index, ret = 0; | |
720 | ||
721 | if (!edev) | |
722 | return -EINVAL; | |
723 | ||
724 | /* Check whether the property is supported or not */ | |
725 | if (!is_extcon_property_supported(id, prop)) | |
726 | return -EINVAL; | |
727 | ||
728 | /* Find the cable index of external connector by using id */ | |
729 | index = find_cable_index_by_id(edev, id); | |
730 | if (index < 0) | |
731 | return index; | |
732 | ||
733 | spin_lock_irqsave(&edev->lock, flags); | |
734 | ||
7f2a0a16 CC |
735 | /* Check whether the property is available or not. */ |
736 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
737 | spin_unlock_irqrestore(&edev->lock, flags); | |
738 | return -EPERM; | |
739 | } | |
740 | ||
792e7e9e CC |
741 | cable = &edev->cables[index]; |
742 | ||
743 | /* Set the property value according to extcon type */ | |
744 | switch (prop) { | |
745 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
746 | cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val; | |
747 | break; | |
748 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
749 | cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val; | |
750 | break; | |
751 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
752 | cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val; | |
753 | break; | |
754 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
755 | cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val; | |
756 | break; | |
757 | default: | |
758 | ret = -EINVAL; | |
759 | break; | |
760 | } | |
761 | ||
762 | spin_unlock_irqrestore(&edev->lock, flags); | |
763 | ||
764 | return ret; | |
765 | } | |
766 | EXPORT_SYMBOL_GPL(extcon_set_property); | |
767 | ||
ab11af04 CC |
768 | /** |
769 | * extcon_set_property_sync() - Set the property value of a specific cable | |
770 | with a notification. | |
771 | * @prop_val: the pointer including the new value of property. | |
772 | * | |
773 | * When setting the property value of external connector, the external connector | |
774 | * should be attached. The each property should be included in the list of | |
775 | * supported properties according to the type of external connectors. | |
776 | * | |
777 | * Returns 0 if success or error number if fail | |
778 | */ | |
779 | int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id, | |
780 | unsigned int prop, | |
781 | union extcon_property_value prop_val) | |
782 | { | |
783 | int ret; | |
784 | ||
785 | ret = extcon_set_property(edev, id, prop, prop_val); | |
786 | if (ret < 0) | |
787 | return ret; | |
788 | ||
789 | return extcon_sync(edev, id); | |
790 | } | |
791 | EXPORT_SYMBOL_GPL(extcon_set_property_sync); | |
792 | ||
7f2a0a16 CC |
793 | /** |
794 | * extcon_get_property_capability() - Get the capability of property | |
795 | * of an external connector. | |
796 | * @edev: the extcon device that has the cable. | |
797 | * @id: the unique id of each external connector | |
798 | * in extcon enumeration. | |
799 | * @prop: the property id among enum extcon_property. | |
800 | * | |
801 | * Returns 1 if the property is available or 0 if not available. | |
802 | */ | |
803 | int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id, | |
804 | unsigned int prop) | |
805 | { | |
806 | int index; | |
807 | ||
808 | if (!edev) | |
809 | return -EINVAL; | |
810 | ||
811 | /* Check whether the property is supported or not */ | |
812 | if (!is_extcon_property_supported(id, prop)) | |
813 | return -EINVAL; | |
814 | ||
815 | /* Find the cable index of external connector by using id */ | |
816 | index = find_cable_index_by_id(edev, id); | |
817 | if (index < 0) | |
818 | return index; | |
819 | ||
820 | return is_extcon_property_capability(edev, id, index, prop); | |
821 | } | |
822 | EXPORT_SYMBOL_GPL(extcon_get_property_capability); | |
823 | ||
824 | /** | |
825 | * extcon_set_property_capability() - Set the capability of a property | |
826 | * of an external connector. | |
827 | * @edev: the extcon device that has the cable. | |
828 | * @id: the unique id of each external connector | |
829 | * in extcon enumeration. | |
830 | * @prop: the property id among enum extcon_property. | |
831 | * | |
832 | * This function set the capability of a property for an external connector | |
833 | * to mark the bit in capability bitmap which mean the available state of | |
834 | * a property. | |
835 | * | |
836 | * Returns 0 if success or error number if fail | |
837 | */ | |
838 | int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id, | |
839 | unsigned int prop) | |
840 | { | |
841 | struct extcon_cable *cable; | |
842 | int index, type, ret = 0; | |
843 | ||
844 | if (!edev) | |
845 | return -EINVAL; | |
846 | ||
847 | /* Check whether the property is supported or not. */ | |
848 | if (!is_extcon_property_supported(id, prop)) | |
849 | return -EINVAL; | |
850 | ||
851 | /* Find the cable index of external connector by using id. */ | |
852 | index = find_cable_index_by_id(edev, id); | |
853 | if (index < 0) | |
854 | return index; | |
855 | ||
856 | type = get_extcon_type(prop); | |
857 | if (type < 0) | |
858 | return type; | |
859 | ||
860 | cable = &edev->cables[index]; | |
861 | ||
862 | switch (type) { | |
863 | case EXTCON_TYPE_USB: | |
864 | __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
865 | break; | |
866 | case EXTCON_TYPE_CHG: | |
867 | __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
868 | break; | |
869 | case EXTCON_TYPE_JACK: | |
870 | __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
871 | break; | |
872 | case EXTCON_TYPE_DISP: | |
873 | __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
874 | break; | |
875 | default: | |
876 | ret = -EINVAL; | |
877 | } | |
878 | ||
879 | return ret; | |
880 | } | |
881 | EXPORT_SYMBOL_GPL(extcon_set_property_capability); | |
882 | ||
74c5d09b DK |
883 | /** |
884 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
885 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
886 | */ | |
887 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
888 | { | |
889 | struct extcon_dev *sd; | |
890 | ||
7eae43ae CC |
891 | if (!extcon_name) |
892 | return ERR_PTR(-EINVAL); | |
893 | ||
74c5d09b DK |
894 | mutex_lock(&extcon_dev_list_lock); |
895 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
896 | if (!strcmp(sd->name, extcon_name)) | |
897 | goto out; | |
898 | } | |
899 | sd = NULL; | |
900 | out: | |
901 | mutex_unlock(&extcon_dev_list_lock); | |
902 | return sd; | |
903 | } | |
904 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
905 | ||
906 | /** | |
c338bb03 | 907 | * extcon_register_notifier() - Register a notifiee to get notified by |
a75e1c73 | 908 | * any attach status changes from the extcon. |
046050f6 CC |
909 | * @edev: the extcon device that has the external connecotr. |
910 | * @id: the unique id of each external connector in extcon enumeration. | |
74c5d09b | 911 | * @nb: a notifier block to be registered. |
806d9dd7 MH |
912 | * |
913 | * Note that the second parameter given to the callback of nb (val) is | |
914 | * "old_state", not the current state. The current state can be retrieved | |
915 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b | 916 | */ |
73b6ecdb | 917 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 918 | struct notifier_block *nb) |
74c5d09b | 919 | { |
66bee35f | 920 | unsigned long flags; |
2c8116a1 | 921 | int ret, idx = -EINVAL; |
046050f6 | 922 | |
01b4c9a1 | 923 | if (!edev || !nb) |
7eae43ae CC |
924 | return -EINVAL; |
925 | ||
01b4c9a1 CC |
926 | idx = find_cable_index_by_id(edev, id); |
927 | if (idx < 0) | |
928 | return idx; | |
66bee35f | 929 | |
01b4c9a1 CC |
930 | spin_lock_irqsave(&edev->lock, flags); |
931 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); | |
932 | spin_unlock_irqrestore(&edev->lock, flags); | |
66bee35f HG |
933 | |
934 | return ret; | |
74c5d09b DK |
935 | } |
936 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
937 | ||
938 | /** | |
c338bb03 | 939 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
046050f6 CC |
940 | * @edev: the extcon device that has the external connecotr. |
941 | * @id: the unique id of each external connector in extcon enumeration. | |
942 | * @nb: a notifier block to be registered. | |
74c5d09b | 943 | */ |
73b6ecdb | 944 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 945 | struct notifier_block *nb) |
74c5d09b | 946 | { |
66bee35f | 947 | unsigned long flags; |
046050f6 CC |
948 | int ret, idx; |
949 | ||
7eae43ae CC |
950 | if (!edev || !nb) |
951 | return -EINVAL; | |
952 | ||
046050f6 | 953 | idx = find_cable_index_by_id(edev, id); |
a05f44c8 SB |
954 | if (idx < 0) |
955 | return idx; | |
66bee35f HG |
956 | |
957 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 958 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
66bee35f HG |
959 | spin_unlock_irqrestore(&edev->lock, flags); |
960 | ||
961 | return ret; | |
74c5d09b DK |
962 | } |
963 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
964 | ||
815429b3 CC |
965 | /** |
966 | * extcon_register_notifier_all() - Register a notifier block for all connectors | |
826a47e9 | 967 | * @edev: the extcon device that has the external connector. |
815429b3 CC |
968 | * @nb: a notifier block to be registered. |
969 | * | |
826a47e9 | 970 | * This function registers a notifier block in order to receive the state |
815429b3 | 971 | * change of all supported external connectors from extcon device. |
826a47e9 | 972 | * And the second parameter given to the callback of nb (val) is |
815429b3 CC |
973 | * the current state and third parameter is the edev pointer. |
974 | * | |
975 | * Returns 0 if success or error number if fail | |
976 | */ | |
977 | int extcon_register_notifier_all(struct extcon_dev *edev, | |
978 | struct notifier_block *nb) | |
979 | { | |
980 | unsigned long flags; | |
981 | int ret; | |
982 | ||
983 | if (!edev || !nb) | |
984 | return -EINVAL; | |
985 | ||
986 | spin_lock_irqsave(&edev->lock, flags); | |
987 | ret = raw_notifier_chain_register(&edev->nh_all, nb); | |
988 | spin_unlock_irqrestore(&edev->lock, flags); | |
989 | ||
990 | return ret; | |
991 | } | |
992 | EXPORT_SYMBOL_GPL(extcon_register_notifier_all); | |
993 | ||
994 | /** | |
995 | * extcon_unregister_notifier_all() - Unregister a notifier block from extcon. | |
996 | * @edev: the extcon device that has the external connecotr. | |
997 | * @nb: a notifier block to be registered. | |
998 | * | |
999 | * Returns 0 if success or error number if fail | |
1000 | */ | |
1001 | int extcon_unregister_notifier_all(struct extcon_dev *edev, | |
1002 | struct notifier_block *nb) | |
1003 | { | |
1004 | unsigned long flags; | |
1005 | int ret; | |
1006 | ||
1007 | if (!edev || !nb) | |
1008 | return -EINVAL; | |
1009 | ||
1010 | spin_lock_irqsave(&edev->lock, flags); | |
1011 | ret = raw_notifier_chain_unregister(&edev->nh_all, nb); | |
1012 | spin_unlock_irqrestore(&edev->lock, flags); | |
1013 | ||
1014 | return ret; | |
1015 | } | |
1016 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all); | |
1017 | ||
af01da0e GKH |
1018 | static struct attribute *extcon_attrs[] = { |
1019 | &dev_attr_state.attr, | |
1020 | &dev_attr_name.attr, | |
1021 | NULL, | |
de55d871 | 1022 | }; |
af01da0e | 1023 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
1024 | |
1025 | static int create_extcon_class(void) | |
1026 | { | |
1027 | if (!extcon_class) { | |
1028 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
1029 | if (IS_ERR(extcon_class)) | |
1030 | return PTR_ERR(extcon_class); | |
af01da0e | 1031 | extcon_class->dev_groups = extcon_groups; |
de55d871 MH |
1032 | } |
1033 | ||
1034 | return 0; | |
1035 | } | |
1036 | ||
de55d871 MH |
1037 | static void extcon_dev_release(struct device *dev) |
1038 | { | |
de55d871 MH |
1039 | } |
1040 | ||
bde68e60 | 1041 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
1042 | static void dummy_sysfs_dev_release(struct device *dev) |
1043 | { | |
1044 | } | |
1045 | ||
a9af6522 CC |
1046 | /* |
1047 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
2a9de9c0 | 1048 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
a9af6522 CC |
1049 | * If supported_cable is NULL, cable name related APIs |
1050 | * are disabled. | |
1051 | * | |
1052 | * This function allocates the memory for extcon device without allocating | |
1053 | * memory in each extcon provider driver and initialize default setting for | |
1054 | * extcon device. | |
1055 | * | |
1056 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail | |
1057 | */ | |
73b6ecdb | 1058 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
a9af6522 CC |
1059 | { |
1060 | struct extcon_dev *edev; | |
1061 | ||
7eae43ae CC |
1062 | if (!supported_cable) |
1063 | return ERR_PTR(-EINVAL); | |
1064 | ||
a9af6522 CC |
1065 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
1066 | if (!edev) | |
1067 | return ERR_PTR(-ENOMEM); | |
1068 | ||
1069 | edev->max_supported = 0; | |
1070 | edev->supported_cable = supported_cable; | |
1071 | ||
1072 | return edev; | |
1073 | } | |
1074 | ||
1075 | /* | |
1076 | * extcon_dev_free() - Free the memory of extcon device. | |
1077 | * @edev: the extcon device to free | |
1078 | */ | |
1079 | void extcon_dev_free(struct extcon_dev *edev) | |
1080 | { | |
1081 | kfree(edev); | |
1082 | } | |
1083 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
1084 | ||
de55d871 MH |
1085 | /** |
1086 | * extcon_dev_register() - Register a new extcon device | |
1087 | * @edev : the new extcon device (should be allocated before calling) | |
de55d871 MH |
1088 | * |
1089 | * Among the members of edev struct, please set the "user initializing data" | |
1090 | * in any case and set the "optional callbacks" if required. However, please | |
1091 | * do not set the values of "internal data", which are initialized by | |
1092 | * this function. | |
1093 | */ | |
42d7d753 | 1094 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 1095 | { |
806d9dd7 | 1096 | int ret, index = 0; |
71c3ffa5 | 1097 | static atomic_t edev_no = ATOMIC_INIT(-1); |
de55d871 MH |
1098 | |
1099 | if (!extcon_class) { | |
1100 | ret = create_extcon_class(); | |
1101 | if (ret < 0) | |
1102 | return ret; | |
1103 | } | |
1104 | ||
7eae43ae | 1105 | if (!edev || !edev->supported_cable) |
2a9de9c0 CC |
1106 | return -EINVAL; |
1107 | ||
1108 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); | |
806d9dd7 | 1109 | |
2a9de9c0 | 1110 | edev->max_supported = index; |
806d9dd7 | 1111 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
1112 | dev_err(&edev->dev, |
1113 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
1114 | return -EINVAL; |
1115 | } | |
1116 | ||
dae61651 CC |
1117 | edev->dev.class = extcon_class; |
1118 | edev->dev.release = extcon_dev_release; | |
de55d871 | 1119 | |
71c3ffa5 | 1120 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
1121 | if (IS_ERR_OR_NULL(edev->name)) { |
1122 | dev_err(&edev->dev, | |
1123 | "extcon device name is null\n"); | |
1124 | return -EINVAL; | |
1125 | } | |
71c3ffa5 CC |
1126 | dev_set_name(&edev->dev, "extcon%lu", |
1127 | (unsigned long)atomic_inc_return(&edev_no)); | |
806d9dd7 MH |
1128 | |
1129 | if (edev->max_supported) { | |
1130 | char buf[10]; | |
1131 | char *str; | |
1132 | struct extcon_cable *cable; | |
1133 | ||
1134 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
1135 | edev->max_supported, GFP_KERNEL); | |
1136 | if (!edev->cables) { | |
1137 | ret = -ENOMEM; | |
1138 | goto err_sysfs_alloc; | |
1139 | } | |
1140 | for (index = 0; index < edev->max_supported; index++) { | |
1141 | cable = &edev->cables[index]; | |
1142 | ||
1143 | snprintf(buf, 10, "cable.%d", index); | |
1144 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
1145 | GFP_KERNEL); | |
1146 | if (!str) { | |
1147 | for (index--; index >= 0; index--) { | |
1148 | cable = &edev->cables[index]; | |
1149 | kfree(cable->attr_g.name); | |
1150 | } | |
1151 | ret = -ENOMEM; | |
1152 | ||
1153 | goto err_alloc_cables; | |
1154 | } | |
1155 | strcpy(str, buf); | |
1156 | ||
1157 | cable->edev = edev; | |
1158 | cable->cable_index = index; | |
1159 | cable->attrs[0] = &cable->attr_name.attr; | |
1160 | cable->attrs[1] = &cable->attr_state.attr; | |
1161 | cable->attrs[2] = NULL; | |
1162 | cable->attr_g.name = str; | |
1163 | cable->attr_g.attrs = cable->attrs; | |
1164 | ||
9baf3220 | 1165 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
1166 | cable->attr_name.attr.name = "name"; |
1167 | cable->attr_name.attr.mode = 0444; | |
1168 | cable->attr_name.show = cable_name_show; | |
1169 | ||
9baf3220 | 1170 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 1171 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 1172 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 1173 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
1174 | } |
1175 | } | |
1176 | ||
bde68e60 MH |
1177 | if (edev->max_supported && edev->mutually_exclusive) { |
1178 | char buf[80]; | |
1179 | char *name; | |
1180 | ||
1181 | /* Count the size of mutually_exclusive array */ | |
1182 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1183 | ; | |
1184 | ||
1185 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
1186 | (index + 1), GFP_KERNEL); | |
1187 | if (!edev->attrs_muex) { | |
1188 | ret = -ENOMEM; | |
1189 | goto err_muex; | |
1190 | } | |
1191 | ||
1192 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
1193 | index, GFP_KERNEL); | |
1194 | if (!edev->d_attrs_muex) { | |
1195 | ret = -ENOMEM; | |
1196 | kfree(edev->attrs_muex); | |
1197 | goto err_muex; | |
1198 | } | |
1199 | ||
1200 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
1201 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
1202 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
1203 | GFP_KERNEL); | |
1204 | if (!name) { | |
1205 | for (index--; index >= 0; index--) { | |
1206 | kfree(edev->d_attrs_muex[index].attr. | |
1207 | name); | |
1208 | } | |
1209 | kfree(edev->d_attrs_muex); | |
1210 | kfree(edev->attrs_muex); | |
1211 | ret = -ENOMEM; | |
1212 | goto err_muex; | |
1213 | } | |
1214 | strcpy(name, buf); | |
9baf3220 | 1215 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
1216 | edev->d_attrs_muex[index].attr.name = name; |
1217 | edev->d_attrs_muex[index].attr.mode = 0000; | |
1218 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
1219 | .attr; | |
1220 | } | |
1221 | edev->attr_g_muex.name = muex_name; | |
1222 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
1223 | ||
1224 | } | |
1225 | ||
806d9dd7 MH |
1226 | if (edev->max_supported) { |
1227 | edev->extcon_dev_type.groups = | |
1228 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 1229 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
1230 | if (!edev->extcon_dev_type.groups) { |
1231 | ret = -ENOMEM; | |
1232 | goto err_alloc_groups; | |
1233 | } | |
1234 | ||
dae61651 | 1235 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
1236 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
1237 | ||
1238 | for (index = 0; index < edev->max_supported; index++) | |
1239 | edev->extcon_dev_type.groups[index] = | |
1240 | &edev->cables[index].attr_g; | |
bde68e60 MH |
1241 | if (edev->mutually_exclusive) |
1242 | edev->extcon_dev_type.groups[index] = | |
1243 | &edev->attr_g_muex; | |
806d9dd7 | 1244 | |
dae61651 | 1245 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
1246 | } |
1247 | ||
dae61651 | 1248 | ret = device_register(&edev->dev); |
de55d871 | 1249 | if (ret) { |
dae61651 | 1250 | put_device(&edev->dev); |
de55d871 MH |
1251 | goto err_dev; |
1252 | } | |
de55d871 | 1253 | |
806d9dd7 | 1254 | spin_lock_init(&edev->lock); |
3f5071a8 ME |
1255 | edev->nh = devm_kcalloc(&edev->dev, edev->max_supported, |
1256 | sizeof(*edev->nh), GFP_KERNEL); | |
046050f6 CC |
1257 | if (!edev->nh) { |
1258 | ret = -ENOMEM; | |
1259 | goto err_dev; | |
1260 | } | |
1261 | ||
1262 | for (index = 0; index < edev->max_supported; index++) | |
1263 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); | |
74c5d09b | 1264 | |
815429b3 CC |
1265 | RAW_INIT_NOTIFIER_HEAD(&edev->nh_all); |
1266 | ||
dae61651 | 1267 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 1268 | edev->state = 0; |
74c5d09b DK |
1269 | |
1270 | mutex_lock(&extcon_dev_list_lock); | |
1271 | list_add(&edev->entry, &extcon_dev_list); | |
1272 | mutex_unlock(&extcon_dev_list_lock); | |
1273 | ||
de55d871 MH |
1274 | return 0; |
1275 | ||
1276 | err_dev: | |
806d9dd7 MH |
1277 | if (edev->max_supported) |
1278 | kfree(edev->extcon_dev_type.groups); | |
1279 | err_alloc_groups: | |
bde68e60 MH |
1280 | if (edev->max_supported && edev->mutually_exclusive) { |
1281 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1282 | kfree(edev->d_attrs_muex[index].attr.name); | |
1283 | kfree(edev->d_attrs_muex); | |
1284 | kfree(edev->attrs_muex); | |
1285 | } | |
1286 | err_muex: | |
806d9dd7 MH |
1287 | for (index = 0; index < edev->max_supported; index++) |
1288 | kfree(edev->cables[index].attr_g.name); | |
1289 | err_alloc_cables: | |
1290 | if (edev->max_supported) | |
1291 | kfree(edev->cables); | |
1292 | err_sysfs_alloc: | |
de55d871 MH |
1293 | return ret; |
1294 | } | |
1295 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
1296 | ||
1297 | /** | |
1298 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 1299 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
1300 | * |
1301 | * Note that this does not call kfree(edev) because edev was not allocated | |
1302 | * by this class. | |
1303 | */ | |
1304 | void extcon_dev_unregister(struct extcon_dev *edev) | |
1305 | { | |
57e7cd37 | 1306 | int index; |
1307 | ||
7eae43ae CC |
1308 | if (!edev) |
1309 | return; | |
1310 | ||
57e7cd37 | 1311 | mutex_lock(&extcon_dev_list_lock); |
1312 | list_del(&edev->entry); | |
1313 | mutex_unlock(&extcon_dev_list_lock); | |
1314 | ||
dae61651 CC |
1315 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
1316 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
1317 | dev_name(&edev->dev)); | |
57e7cd37 | 1318 | return; |
1319 | } | |
1320 | ||
7585ca0d WX |
1321 | device_unregister(&edev->dev); |
1322 | ||
57e7cd37 | 1323 | if (edev->mutually_exclusive && edev->max_supported) { |
1324 | for (index = 0; edev->mutually_exclusive[index]; | |
1325 | index++) | |
1326 | kfree(edev->d_attrs_muex[index].attr.name); | |
1327 | kfree(edev->d_attrs_muex); | |
1328 | kfree(edev->attrs_muex); | |
1329 | } | |
1330 | ||
1331 | for (index = 0; index < edev->max_supported; index++) | |
1332 | kfree(edev->cables[index].attr_g.name); | |
1333 | ||
1334 | if (edev->max_supported) { | |
1335 | kfree(edev->extcon_dev_type.groups); | |
1336 | kfree(edev->cables); | |
1337 | } | |
1338 | ||
dae61651 | 1339 | put_device(&edev->dev); |
de55d871 MH |
1340 | } |
1341 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
1342 | ||
1ad94ffe CC |
1343 | #ifdef CONFIG_OF |
1344 | /* | |
1345 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree | |
1346 | * @dev - instance to the given device | |
1347 | * @index - index into list of extcon_dev | |
1348 | * | |
1349 | * return the instance of extcon device | |
1350 | */ | |
1351 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1352 | { | |
1353 | struct device_node *node; | |
1354 | struct extcon_dev *edev; | |
1355 | ||
7eae43ae CC |
1356 | if (!dev) |
1357 | return ERR_PTR(-EINVAL); | |
1358 | ||
1ad94ffe | 1359 | if (!dev->of_node) { |
e8752b7a | 1360 | dev_dbg(dev, "device does not have a device node entry\n"); |
1ad94ffe CC |
1361 | return ERR_PTR(-EINVAL); |
1362 | } | |
1363 | ||
1364 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
1365 | if (!node) { | |
e8752b7a | 1366 | dev_dbg(dev, "failed to get phandle in %s node\n", |
1ad94ffe CC |
1367 | dev->of_node->full_name); |
1368 | return ERR_PTR(-ENODEV); | |
1369 | } | |
1370 | ||
f841afb1 TF |
1371 | mutex_lock(&extcon_dev_list_lock); |
1372 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
1373 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
1374 | mutex_unlock(&extcon_dev_list_lock); | |
5d5c4c13 | 1375 | of_node_put(node); |
f841afb1 TF |
1376 | return edev; |
1377 | } | |
1ad94ffe | 1378 | } |
f841afb1 | 1379 | mutex_unlock(&extcon_dev_list_lock); |
5d5c4c13 | 1380 | of_node_put(node); |
1ad94ffe | 1381 | |
f841afb1 | 1382 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
1383 | } |
1384 | #else | |
1385 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1386 | { | |
1387 | return ERR_PTR(-ENOSYS); | |
1388 | } | |
1389 | #endif /* CONFIG_OF */ | |
1390 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
1391 | ||
707d7550 CC |
1392 | /** |
1393 | * extcon_get_edev_name() - Get the name of the extcon device. | |
1394 | * @edev: the extcon device | |
1395 | */ | |
1396 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
1397 | { | |
1398 | return !edev ? NULL : edev->name; | |
1399 | } | |
1400 | ||
de55d871 MH |
1401 | static int __init extcon_class_init(void) |
1402 | { | |
1403 | return create_extcon_class(); | |
1404 | } | |
1405 | module_init(extcon_class_init); | |
1406 | ||
1407 | static void __exit extcon_class_exit(void) | |
1408 | { | |
1409 | class_destroy(extcon_class); | |
1410 | } | |
1411 | module_exit(extcon_class_exit); | |
1412 | ||
2a9de9c0 | 1413 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 MH |
1414 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); |
1415 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
1416 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
1417 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
1418 | MODULE_LICENSE("GPL"); |