Commit | Line | Data |
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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
de55d871 | 2 | /* |
6ab6094f | 3 | * drivers/extcon/extcon.c - External Connector (extcon) framework. |
de55d871 | 4 | * |
2a9de9c0 CC |
5 | * Copyright (C) 2015 Samsung Electronics |
6 | * Author: Chanwoo Choi <cw00.choi@samsung.com> | |
7 | * | |
de55d871 MH |
8 | * Copyright (C) 2012 Samsung Electronics |
9 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
10 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
11 | * | |
12 | * based on android/drivers/switch/switch_class.c | |
13 | * Copyright (C) 2008 Google, Inc. | |
14 | * Author: Mike Lockwood <lockwood@android.com> | |
b9ec23c0 | 15 | */ |
de55d871 MH |
16 | |
17 | #include <linux/module.h> | |
18 | #include <linux/types.h> | |
7bba9e81 | 19 | #include <linux/idr.h> |
de55d871 MH |
20 | #include <linux/init.h> |
21 | #include <linux/device.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/err.h> | |
f841afb1 | 24 | #include <linux/of.h> |
de55d871 | 25 | #include <linux/slab.h> |
9baf3220 | 26 | #include <linux/sysfs.h> |
de55d871 | 27 | |
e6cf0465 CC |
28 | #include "extcon.h" |
29 | ||
2a9de9c0 | 30 | #define SUPPORTED_CABLE_MAX 32 |
2a9de9c0 | 31 | |
5183240c | 32 | static const struct __extcon_info { |
55e4e2f1 CC |
33 | unsigned int type; |
34 | unsigned int id; | |
35 | const char *name; | |
36 | ||
37 | } extcon_info[] = { | |
38 | [EXTCON_NONE] = { | |
39 | .type = EXTCON_TYPE_MISC, | |
40 | .id = EXTCON_NONE, | |
41 | .name = "NONE", | |
42 | }, | |
73b6ecdb | 43 | |
8e9bc36d | 44 | /* USB external connector */ |
55e4e2f1 CC |
45 | [EXTCON_USB] = { |
46 | .type = EXTCON_TYPE_USB, | |
47 | .id = EXTCON_USB, | |
48 | .name = "USB", | |
49 | }, | |
50 | [EXTCON_USB_HOST] = { | |
51 | .type = EXTCON_TYPE_USB, | |
52 | .id = EXTCON_USB_HOST, | |
86d6cda6 | 53 | .name = "USB-HOST", |
55e4e2f1 | 54 | }, |
8e9bc36d | 55 | |
11eecf91 | 56 | /* Charging external connector */ |
55e4e2f1 CC |
57 | [EXTCON_CHG_USB_SDP] = { |
58 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
59 | .id = EXTCON_CHG_USB_SDP, | |
60 | .name = "SDP", | |
61 | }, | |
62 | [EXTCON_CHG_USB_DCP] = { | |
63 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
64 | .id = EXTCON_CHG_USB_DCP, | |
65 | .name = "DCP", | |
66 | }, | |
67 | [EXTCON_CHG_USB_CDP] = { | |
68 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
69 | .id = EXTCON_CHG_USB_CDP, | |
70 | .name = "CDP", | |
71 | }, | |
72 | [EXTCON_CHG_USB_ACA] = { | |
73 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
74 | .id = EXTCON_CHG_USB_ACA, | |
75 | .name = "ACA", | |
76 | }, | |
77 | [EXTCON_CHG_USB_FAST] = { | |
78 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
79 | .id = EXTCON_CHG_USB_FAST, | |
80 | .name = "FAST-CHARGER", | |
81 | }, | |
82 | [EXTCON_CHG_USB_SLOW] = { | |
83 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
84 | .id = EXTCON_CHG_USB_SLOW, | |
85 | .name = "SLOW-CHARGER", | |
86 | }, | |
7fe95fb8 CC |
87 | [EXTCON_CHG_WPT] = { |
88 | .type = EXTCON_TYPE_CHG, | |
89 | .id = EXTCON_CHG_WPT, | |
90 | .name = "WPT", | |
91 | }, | |
3c5f0e07 CC |
92 | [EXTCON_CHG_USB_PD] = { |
93 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, | |
94 | .id = EXTCON_CHG_USB_PD, | |
95 | .name = "PD", | |
96 | }, | |
8e9bc36d | 97 | |
11eecf91 | 98 | /* Jack external connector */ |
55e4e2f1 CC |
99 | [EXTCON_JACK_MICROPHONE] = { |
100 | .type = EXTCON_TYPE_JACK, | |
101 | .id = EXTCON_JACK_MICROPHONE, | |
102 | .name = "MICROPHONE", | |
103 | }, | |
104 | [EXTCON_JACK_HEADPHONE] = { | |
105 | .type = EXTCON_TYPE_JACK, | |
106 | .id = EXTCON_JACK_HEADPHONE, | |
107 | .name = "HEADPHONE", | |
108 | }, | |
109 | [EXTCON_JACK_LINE_IN] = { | |
110 | .type = EXTCON_TYPE_JACK, | |
111 | .id = EXTCON_JACK_LINE_IN, | |
112 | .name = "LINE-IN", | |
113 | }, | |
114 | [EXTCON_JACK_LINE_OUT] = { | |
115 | .type = EXTCON_TYPE_JACK, | |
116 | .id = EXTCON_JACK_LINE_OUT, | |
117 | .name = "LINE-OUT", | |
118 | }, | |
119 | [EXTCON_JACK_VIDEO_IN] = { | |
120 | .type = EXTCON_TYPE_JACK, | |
121 | .id = EXTCON_JACK_VIDEO_IN, | |
122 | .name = "VIDEO-IN", | |
123 | }, | |
124 | [EXTCON_JACK_VIDEO_OUT] = { | |
125 | .type = EXTCON_TYPE_JACK, | |
126 | .id = EXTCON_JACK_VIDEO_OUT, | |
127 | .name = "VIDEO-OUT", | |
128 | }, | |
129 | [EXTCON_JACK_SPDIF_IN] = { | |
130 | .type = EXTCON_TYPE_JACK, | |
131 | .id = EXTCON_JACK_SPDIF_IN, | |
132 | .name = "SPDIF-IN", | |
133 | }, | |
134 | [EXTCON_JACK_SPDIF_OUT] = { | |
135 | .type = EXTCON_TYPE_JACK, | |
136 | .id = EXTCON_JACK_SPDIF_OUT, | |
137 | .name = "SPDIF-OUT", | |
138 | }, | |
8e9bc36d | 139 | |
11eecf91 | 140 | /* Display external connector */ |
55e4e2f1 CC |
141 | [EXTCON_DISP_HDMI] = { |
142 | .type = EXTCON_TYPE_DISP, | |
143 | .id = EXTCON_DISP_HDMI, | |
144 | .name = "HDMI", | |
145 | }, | |
146 | [EXTCON_DISP_MHL] = { | |
147 | .type = EXTCON_TYPE_DISP, | |
148 | .id = EXTCON_DISP_MHL, | |
149 | .name = "MHL", | |
150 | }, | |
151 | [EXTCON_DISP_DVI] = { | |
152 | .type = EXTCON_TYPE_DISP, | |
153 | .id = EXTCON_DISP_DVI, | |
154 | .name = "DVI", | |
155 | }, | |
156 | [EXTCON_DISP_VGA] = { | |
157 | .type = EXTCON_TYPE_DISP, | |
158 | .id = EXTCON_DISP_VGA, | |
159 | .name = "VGA", | |
160 | }, | |
2164188d CZ |
161 | [EXTCON_DISP_DP] = { |
162 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
163 | .id = EXTCON_DISP_DP, | |
164 | .name = "DP", | |
165 | }, | |
9c0595d6 CC |
166 | [EXTCON_DISP_HMD] = { |
167 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, | |
168 | .id = EXTCON_DISP_HMD, | |
169 | .name = "HMD", | |
170 | }, | |
3a06ed80 MW |
171 | [EXTCON_DISP_CVBS] = { |
172 | .type = EXTCON_TYPE_DISP, | |
173 | .id = EXTCON_DISP_CVBS, | |
174 | .name = "CVBS", | |
175 | }, | |
176 | [EXTCON_DISP_EDP] = { | |
177 | .type = EXTCON_TYPE_DISP, | |
178 | .id = EXTCON_DISP_EDP, | |
179 | .name = "EDP", | |
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 | 202 | /** |
6ab6094f CC |
203 | * struct extcon_cable - An internal data for an external connector. |
204 | * @edev: the extcon device | |
205 | * @cable_index: the index of this cable in the edev | |
206 | * @attr_g: the attribute group for the cable | |
20f7b53d CC |
207 | * @attr_name: "name" sysfs entry |
208 | * @attr_state: "state" sysfs entry | |
6ab6094f | 209 | * @attrs: the array pointing to attr_name and attr_state for attr_g |
7e77e0b7 AS |
210 | * @usb_propval: the array of USB connector properties |
211 | * @chg_propval: the array of charger connector properties | |
212 | * @jack_propval: the array of jack connector properties | |
213 | * @disp_propval: the array of display connector properties | |
73346b99 AS |
214 | * @usb_bits: the bit array of the USB connector property capabilities |
215 | * @chg_bits: the bit array of the charger connector property capabilities | |
216 | * @jack_bits: the bit array of the jack connector property capabilities | |
217 | * @disp_bits: the bit array of the display connector property capabilities | |
20f7b53d CC |
218 | */ |
219 | struct extcon_cable { | |
220 | struct extcon_dev *edev; | |
221 | int cable_index; | |
222 | ||
223 | struct attribute_group attr_g; | |
224 | struct device_attribute attr_name; | |
225 | struct device_attribute attr_state; | |
226 | ||
227 | struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ | |
792e7e9e CC |
228 | |
229 | union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT]; | |
230 | union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT]; | |
231 | union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT]; | |
232 | union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT]; | |
7f2a0a16 | 233 | |
6e4e8670 AS |
234 | DECLARE_BITMAP(usb_bits, EXTCON_PROP_USB_CNT); |
235 | DECLARE_BITMAP(chg_bits, EXTCON_PROP_CHG_CNT); | |
236 | DECLARE_BITMAP(jack_bits, EXTCON_PROP_JACK_CNT); | |
237 | DECLARE_BITMAP(disp_bits, EXTCON_PROP_DISP_CNT); | |
20f7b53d CC |
238 | }; |
239 | ||
be3a07f7 | 240 | static struct class *extcon_class; |
de55d871 | 241 | |
7bba9e81 | 242 | static DEFINE_IDA(extcon_dev_ids); |
74c5d09b DK |
243 | static LIST_HEAD(extcon_dev_list); |
244 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
245 | ||
bde68e60 MH |
246 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) |
247 | { | |
93e60cd5 | 248 | int i; |
bde68e60 MH |
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 | ||
97e1bb93 | 270 | /* Find the index of extcon cable in edev->supported_cable */ |
2a9de9c0 CC |
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 | 374 | if (edev->max_supported == 0) |
6ee0a22e | 375 | return sysfs_emit(buf, "%u\n", edev->state); |
806d9dd7 | 376 | |
2a9de9c0 | 377 | for (i = 0; i < edev->max_supported; i++) { |
6ee0a22e AS |
378 | count += sysfs_emit_at(buf, count, "%s=%d\n", |
379 | extcon_info[edev->supported_cable[i]].name, | |
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 | |
6ee0a22e | 392 | return sysfs_emit(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 | 402 | |
6ee0a22e AS |
403 | return sysfs_emit(buf, "%s\n", |
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 | ||
6ee0a22e AS |
415 | return sysfs_emit(buf, "%d\n", |
416 | extcon_get_state(cable->edev, cable->edev->supported_cable[i])); | |
806d9dd7 MH |
417 | } |
418 | ||
de55d871 | 419 | /** |
6ab6094f CC |
420 | * extcon_sync() - Synchronize the state for an external connector. |
421 | * @edev: the extcon device | |
6506f6a0 | 422 | * @id: the unique id indicating an external connector |
6ab6094f CC |
423 | * |
424 | * Note that this function send a notification in order to synchronize | |
425 | * the state and property of an external connector. | |
74c5d09b | 426 | * |
6ab6094f | 427 | * Returns 0 if success or error number if fail. |
de55d871 | 428 | */ |
ab11af04 | 429 | int extcon_sync(struct extcon_dev *edev, unsigned int id) |
de55d871 MH |
430 | { |
431 | char name_buf[120]; | |
432 | char state_buf[120]; | |
433 | char *prop_buf; | |
434 | char *envp[3]; | |
435 | int env_offset = 0; | |
436 | int length; | |
046050f6 | 437 | int index; |
ab11af04 | 438 | int state; |
806d9dd7 | 439 | unsigned long flags; |
de55d871 | 440 | |
7eae43ae CC |
441 | if (!edev) |
442 | return -EINVAL; | |
443 | ||
ab11af04 CC |
444 | index = find_cable_index_by_id(edev, id); |
445 | if (index < 0) | |
446 | return index; | |
447 | ||
806d9dd7 | 448 | spin_lock_irqsave(&edev->lock, flags); |
ab11af04 | 449 | state = !!(edev->state & BIT(index)); |
8a9dbb77 | 450 | spin_unlock_irqrestore(&edev->lock, flags); |
815429b3 CC |
451 | |
452 | /* | |
453 | * Call functions in a raw notifier chain for the specific one | |
454 | * external connector. | |
455 | */ | |
ab11af04 CC |
456 | raw_notifier_call_chain(&edev->nh[index], state, edev); |
457 | ||
815429b3 CC |
458 | /* |
459 | * Call functions in a raw notifier chain for the all supported | |
460 | * external connectors. | |
461 | */ | |
462 | raw_notifier_call_chain(&edev->nh_all, state, edev); | |
463 | ||
8a9dbb77 | 464 | spin_lock_irqsave(&edev->lock, flags); |
ab11af04 CC |
465 | /* This could be in interrupt handler */ |
466 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
467 | if (!prop_buf) { | |
468 | /* Unlock early before uevent */ | |
806d9dd7 | 469 | spin_unlock_irqrestore(&edev->lock, flags); |
ab11af04 CC |
470 | |
471 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); | |
472 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
473 | ||
e7d9dd5a | 474 | return -ENOMEM; |
ab11af04 CC |
475 | } |
476 | ||
477 | length = name_show(&edev->dev, NULL, prop_buf); | |
478 | if (length > 0) { | |
479 | if (prop_buf[length - 1] == '\n') | |
480 | prop_buf[length - 1] = 0; | |
481 | snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf); | |
482 | envp[env_offset++] = name_buf; | |
483 | } | |
484 | ||
485 | length = state_show(&edev->dev, NULL, prop_buf); | |
486 | if (length > 0) { | |
487 | if (prop_buf[length - 1] == '\n') | |
488 | prop_buf[length - 1] = 0; | |
489 | snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf); | |
490 | envp[env_offset++] = state_buf; | |
de55d871 | 491 | } |
ab11af04 CC |
492 | envp[env_offset] = NULL; |
493 | ||
494 | /* Unlock early before uevent */ | |
495 | spin_unlock_irqrestore(&edev->lock, flags); | |
496 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); | |
497 | free_page((unsigned long)prop_buf); | |
bde68e60 MH |
498 | |
499 | return 0; | |
de55d871 | 500 | } |
ab11af04 | 501 | EXPORT_SYMBOL_GPL(extcon_sync); |
de55d871 | 502 | |
806d9dd7 | 503 | /** |
6ab6094f CC |
504 | * extcon_get_state() - Get the state of an external connector. |
505 | * @edev: the extcon device | |
506 | * @id: the unique id indicating an external connector | |
507 | * | |
508 | * Returns 0 if success or error number if fail. | |
806d9dd7 | 509 | */ |
575c2b86 | 510 | int extcon_get_state(struct extcon_dev *edev, const unsigned int id) |
806d9dd7 | 511 | { |
575c2b86 CC |
512 | int index, state; |
513 | unsigned long flags; | |
806d9dd7 | 514 | |
7eae43ae CC |
515 | if (!edev) |
516 | return -EINVAL; | |
517 | ||
2a9de9c0 CC |
518 | index = find_cable_index_by_id(edev, id); |
519 | if (index < 0) | |
520 | return index; | |
806d9dd7 | 521 | |
575c2b86 CC |
522 | spin_lock_irqsave(&edev->lock, flags); |
523 | state = is_extcon_attached(edev, index); | |
524 | spin_unlock_irqrestore(&edev->lock, flags); | |
806d9dd7 | 525 | |
575c2b86 | 526 | return state; |
806d9dd7 | 527 | } |
575c2b86 | 528 | EXPORT_SYMBOL_GPL(extcon_get_state); |
806d9dd7 | 529 | |
806d9dd7 | 530 | /** |
6ab6094f CC |
531 | * extcon_set_state() - Set the state of an external connector. |
532 | * @edev: the extcon device | |
533 | * @id: the unique id indicating an external connector | |
534 | * @state: the new state of an external connector. | |
535 | * the default semantics is true: attached / false: detached. | |
536 | * | |
537 | * Note that this function set the state of an external connector without | |
538 | * a notification. To synchronize the state of an external connector, | |
539 | * have to use extcon_set_state_sync() and extcon_sync(). | |
ab11af04 | 540 | * |
6ab6094f | 541 | * Returns 0 if success or error number if fail. |
806d9dd7 | 542 | */ |
6ab6094f | 543 | int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state) |
806d9dd7 | 544 | { |
ab11af04 CC |
545 | unsigned long flags; |
546 | int index, ret = 0; | |
806d9dd7 | 547 | |
7eae43ae CC |
548 | if (!edev) |
549 | return -EINVAL; | |
550 | ||
2a9de9c0 CC |
551 | index = find_cable_index_by_id(edev, id); |
552 | if (index < 0) | |
553 | return index; | |
554 | ||
ab11af04 CC |
555 | spin_lock_irqsave(&edev->lock, flags); |
556 | ||
557 | /* Check whether the external connector's state is changed. */ | |
6ab6094f | 558 | if (!is_extcon_changed(edev, index, state)) |
ab11af04 CC |
559 | goto out; |
560 | ||
561 | if (check_mutually_exclusive(edev, | |
6ab6094f | 562 | (edev->state & ~BIT(index)) | (state & BIT(index)))) { |
ab11af04 CC |
563 | ret = -EPERM; |
564 | goto out; | |
565 | } | |
566 | ||
792e7e9e CC |
567 | /* |
568 | * Initialize the value of extcon property before setting | |
569 | * the detached state for an external connector. | |
570 | */ | |
6ab6094f | 571 | if (!state) |
792e7e9e CC |
572 | init_property(edev, id, index); |
573 | ||
6ab6094f CC |
574 | /* Update the state for an external connector. */ |
575 | if (state) | |
ab11af04 CC |
576 | edev->state |= BIT(index); |
577 | else | |
578 | edev->state &= ~(BIT(index)); | |
579 | out: | |
580 | spin_unlock_irqrestore(&edev->lock, flags); | |
581 | ||
582 | return ret; | |
806d9dd7 | 583 | } |
575c2b86 | 584 | EXPORT_SYMBOL_GPL(extcon_set_state); |
806d9dd7 | 585 | |
ab11af04 | 586 | /** |
6ab6094f CC |
587 | * extcon_set_state_sync() - Set the state of an external connector with sync. |
588 | * @edev: the extcon device | |
589 | * @id: the unique id indicating an external connector | |
590 | * @state: the new state of external connector. | |
591 | * the default semantics is true: attached / false: detached. | |
592 | * | |
593 | * Note that this function set the state of external connector | |
594 | * and synchronize the state by sending a notification. | |
ab11af04 | 595 | * |
6ab6094f | 596 | * Returns 0 if success or error number if fail. |
ab11af04 | 597 | */ |
6ab6094f | 598 | int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state) |
ab11af04 | 599 | { |
2da3db7f | 600 | int ret; |
ab11af04 | 601 | |
6ab6094f | 602 | ret = extcon_set_state(edev, id, state); |
ab11af04 CC |
603 | if (ret < 0) |
604 | return ret; | |
605 | ||
606 | return extcon_sync(edev, id); | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(extcon_set_state_sync); | |
609 | ||
792e7e9e | 610 | /** |
6ab6094f CC |
611 | * extcon_get_property() - Get the property value of an external connector. |
612 | * @edev: the extcon device | |
613 | * @id: the unique id indicating an external connector | |
614 | * @prop: the property id indicating an extcon property | |
615 | * @prop_val: the pointer which store the value of extcon property | |
792e7e9e | 616 | * |
6ab6094f CC |
617 | * Note that when getting the property value of external connector, |
618 | * the external connector should be attached. If detached state, function | |
619 | * return 0 without property value. Also, the each property should be | |
620 | * included in the list of supported properties according to extcon type. | |
792e7e9e | 621 | * |
6ab6094f | 622 | * Returns 0 if success or error number if fail. |
792e7e9e CC |
623 | */ |
624 | int extcon_get_property(struct extcon_dev *edev, unsigned int id, | |
625 | unsigned int prop, | |
626 | union extcon_property_value *prop_val) | |
627 | { | |
628 | struct extcon_cable *cable; | |
629 | unsigned long flags; | |
630 | int index, ret = 0; | |
631 | ||
cff7499d | 632 | *prop_val = (union extcon_property_value){0}; |
792e7e9e CC |
633 | |
634 | if (!edev) | |
635 | return -EINVAL; | |
636 | ||
637 | /* Check whether the property is supported or not */ | |
638 | if (!is_extcon_property_supported(id, prop)) | |
639 | return -EINVAL; | |
640 | ||
641 | /* Find the cable index of external connector by using id */ | |
642 | index = find_cable_index_by_id(edev, id); | |
643 | if (index < 0) | |
644 | return index; | |
645 | ||
646 | spin_lock_irqsave(&edev->lock, flags); | |
647 | ||
7f2a0a16 CC |
648 | /* Check whether the property is available or not. */ |
649 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
650 | spin_unlock_irqrestore(&edev->lock, flags); | |
651 | return -EPERM; | |
652 | } | |
653 | ||
792e7e9e CC |
654 | /* |
655 | * Check whether the external connector is attached. | |
656 | * If external connector is detached, the user can not | |
657 | * get the property value. | |
658 | */ | |
659 | if (!is_extcon_attached(edev, index)) { | |
660 | spin_unlock_irqrestore(&edev->lock, flags); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | cable = &edev->cables[index]; | |
665 | ||
666 | /* Get the property value according to extcon type */ | |
667 | switch (prop) { | |
668 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
669 | *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN]; | |
670 | break; | |
671 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
672 | *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN]; | |
673 | break; | |
674 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
675 | *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN]; | |
676 | break; | |
677 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
678 | *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN]; | |
679 | break; | |
680 | default: | |
681 | ret = -EINVAL; | |
682 | break; | |
683 | } | |
684 | ||
685 | spin_unlock_irqrestore(&edev->lock, flags); | |
686 | ||
687 | return ret; | |
688 | } | |
689 | EXPORT_SYMBOL_GPL(extcon_get_property); | |
690 | ||
691 | /** | |
6ab6094f CC |
692 | * extcon_set_property() - Set the property value of an external connector. |
693 | * @edev: the extcon device | |
694 | * @id: the unique id indicating an external connector | |
695 | * @prop: the property id indicating an extcon property | |
696 | * @prop_val: the pointer including the new value of extcon property | |
792e7e9e | 697 | * |
6ab6094f CC |
698 | * Note that each property should be included in the list of supported |
699 | * properties according to the extcon type. | |
792e7e9e | 700 | * |
6ab6094f | 701 | * Returns 0 if success or error number if fail. |
792e7e9e CC |
702 | */ |
703 | int extcon_set_property(struct extcon_dev *edev, unsigned int id, | |
704 | unsigned int prop, | |
705 | union extcon_property_value prop_val) | |
706 | { | |
707 | struct extcon_cable *cable; | |
708 | unsigned long flags; | |
709 | int index, ret = 0; | |
710 | ||
711 | if (!edev) | |
712 | return -EINVAL; | |
713 | ||
714 | /* Check whether the property is supported or not */ | |
715 | if (!is_extcon_property_supported(id, prop)) | |
716 | return -EINVAL; | |
717 | ||
718 | /* Find the cable index of external connector by using id */ | |
719 | index = find_cable_index_by_id(edev, id); | |
720 | if (index < 0) | |
721 | return index; | |
722 | ||
723 | spin_lock_irqsave(&edev->lock, flags); | |
724 | ||
7f2a0a16 CC |
725 | /* Check whether the property is available or not. */ |
726 | if (!is_extcon_property_capability(edev, id, index, prop)) { | |
727 | spin_unlock_irqrestore(&edev->lock, flags); | |
728 | return -EPERM; | |
729 | } | |
730 | ||
792e7e9e CC |
731 | cable = &edev->cables[index]; |
732 | ||
733 | /* Set the property value according to extcon type */ | |
734 | switch (prop) { | |
735 | case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: | |
736 | cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val; | |
737 | break; | |
738 | case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: | |
739 | cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val; | |
740 | break; | |
741 | case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: | |
742 | cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val; | |
743 | break; | |
744 | case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: | |
745 | cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val; | |
746 | break; | |
747 | default: | |
748 | ret = -EINVAL; | |
749 | break; | |
750 | } | |
751 | ||
752 | spin_unlock_irqrestore(&edev->lock, flags); | |
753 | ||
754 | return ret; | |
755 | } | |
756 | EXPORT_SYMBOL_GPL(extcon_set_property); | |
757 | ||
ab11af04 | 758 | /** |
6ab6094f | 759 | * extcon_set_property_sync() - Set property of an external connector with sync. |
6506f6a0 YL |
760 | * @edev: the extcon device |
761 | * @id: the unique id indicating an external connector | |
762 | * @prop: the property id indicating an extcon property | |
6ab6094f | 763 | * @prop_val: the pointer including the new value of extcon property |
ab11af04 | 764 | * |
6ab6094f CC |
765 | * Note that when setting the property value of external connector, |
766 | * the external connector should be attached. The each property should | |
767 | * be included in the list of supported properties according to extcon type. | |
ab11af04 | 768 | * |
6ab6094f | 769 | * Returns 0 if success or error number if fail. |
ab11af04 CC |
770 | */ |
771 | int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id, | |
772 | unsigned int prop, | |
773 | union extcon_property_value prop_val) | |
774 | { | |
775 | int ret; | |
776 | ||
777 | ret = extcon_set_property(edev, id, prop, prop_val); | |
778 | if (ret < 0) | |
779 | return ret; | |
780 | ||
781 | return extcon_sync(edev, id); | |
782 | } | |
783 | EXPORT_SYMBOL_GPL(extcon_set_property_sync); | |
784 | ||
7f2a0a16 | 785 | /** |
6ab6094f CC |
786 | * extcon_get_property_capability() - Get the capability of the property |
787 | * for an external connector. | |
788 | * @edev: the extcon device | |
789 | * @id: the unique id indicating an external connector | |
790 | * @prop: the property id indicating an extcon property | |
7f2a0a16 CC |
791 | * |
792 | * Returns 1 if the property is available or 0 if not available. | |
793 | */ | |
794 | int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id, | |
795 | unsigned int prop) | |
796 | { | |
797 | int index; | |
798 | ||
799 | if (!edev) | |
800 | return -EINVAL; | |
801 | ||
802 | /* Check whether the property is supported or not */ | |
803 | if (!is_extcon_property_supported(id, prop)) | |
804 | return -EINVAL; | |
805 | ||
806 | /* Find the cable index of external connector by using id */ | |
807 | index = find_cable_index_by_id(edev, id); | |
808 | if (index < 0) | |
809 | return index; | |
810 | ||
811 | return is_extcon_property_capability(edev, id, index, prop); | |
812 | } | |
813 | EXPORT_SYMBOL_GPL(extcon_get_property_capability); | |
814 | ||
815 | /** | |
6ab6094f CC |
816 | * extcon_set_property_capability() - Set the capability of the property |
817 | * for an external connector. | |
818 | * @edev: the extcon device | |
819 | * @id: the unique id indicating an external connector | |
820 | * @prop: the property id indicating an extcon property | |
7f2a0a16 | 821 | * |
6ab6094f CC |
822 | * Note that this function set the capability of the property |
823 | * for an external connector in order to mark the bit in capability | |
824 | * bitmap which mean the available state of the property. | |
7f2a0a16 | 825 | * |
6ab6094f | 826 | * Returns 0 if success or error number if fail. |
7f2a0a16 CC |
827 | */ |
828 | int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id, | |
829 | unsigned int prop) | |
830 | { | |
831 | struct extcon_cable *cable; | |
832 | int index, type, ret = 0; | |
833 | ||
834 | if (!edev) | |
835 | return -EINVAL; | |
836 | ||
837 | /* Check whether the property is supported or not. */ | |
838 | if (!is_extcon_property_supported(id, prop)) | |
839 | return -EINVAL; | |
840 | ||
841 | /* Find the cable index of external connector by using id. */ | |
842 | index = find_cable_index_by_id(edev, id); | |
843 | if (index < 0) | |
844 | return index; | |
845 | ||
846 | type = get_extcon_type(prop); | |
847 | if (type < 0) | |
848 | return type; | |
849 | ||
850 | cable = &edev->cables[index]; | |
851 | ||
852 | switch (type) { | |
853 | case EXTCON_TYPE_USB: | |
854 | __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); | |
855 | break; | |
856 | case EXTCON_TYPE_CHG: | |
857 | __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); | |
858 | break; | |
859 | case EXTCON_TYPE_JACK: | |
860 | __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); | |
861 | break; | |
862 | case EXTCON_TYPE_DISP: | |
863 | __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); | |
864 | break; | |
865 | default: | |
866 | ret = -EINVAL; | |
867 | } | |
868 | ||
869 | return ret; | |
870 | } | |
871 | EXPORT_SYMBOL_GPL(extcon_set_property_capability); | |
872 | ||
74c5d09b | 873 | /** |
6ab6094f CC |
874 | * extcon_get_extcon_dev() - Get the extcon device instance from the name. |
875 | * @extcon_name: the extcon name provided with extcon_dev_register() | |
876 | * | |
877 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. | |
58e4a2d2 DC |
878 | * NOTE: This function returns -EPROBE_DEFER so it may only be called from |
879 | * probe() functions. | |
74c5d09b DK |
880 | */ |
881 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
882 | { | |
883 | struct extcon_dev *sd; | |
884 | ||
7eae43ae CC |
885 | if (!extcon_name) |
886 | return ERR_PTR(-EINVAL); | |
887 | ||
74c5d09b DK |
888 | mutex_lock(&extcon_dev_list_lock); |
889 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
890 | if (!strcmp(sd->name, extcon_name)) | |
891 | goto out; | |
892 | } | |
58e4a2d2 | 893 | sd = ERR_PTR(-EPROBE_DEFER); |
74c5d09b DK |
894 | out: |
895 | mutex_unlock(&extcon_dev_list_lock); | |
896 | return sd; | |
897 | } | |
898 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
899 | ||
900 | /** | |
6ab6094f CC |
901 | * extcon_register_notifier() - Register a notifier block to get notified by |
902 | * any state changes from the extcon. | |
903 | * @edev: the extcon device | |
904 | * @id: the unique id indicating an external connector | |
905 | * @nb: a notifier block to be registered | |
806d9dd7 MH |
906 | * |
907 | * Note that the second parameter given to the callback of nb (val) is | |
6ab6094f CC |
908 | * the current state of an external connector and the third pameter |
909 | * is the pointer of extcon device. | |
910 | * | |
911 | * Returns 0 if success or error number if fail. | |
74c5d09b | 912 | */ |
73b6ecdb | 913 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 914 | struct notifier_block *nb) |
74c5d09b | 915 | { |
66bee35f | 916 | unsigned long flags; |
1fa80f18 | 917 | int ret, idx; |
046050f6 | 918 | |
01b4c9a1 | 919 | if (!edev || !nb) |
7eae43ae CC |
920 | return -EINVAL; |
921 | ||
01b4c9a1 CC |
922 | idx = find_cable_index_by_id(edev, id); |
923 | if (idx < 0) | |
924 | return idx; | |
66bee35f | 925 | |
01b4c9a1 CC |
926 | spin_lock_irqsave(&edev->lock, flags); |
927 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); | |
928 | spin_unlock_irqrestore(&edev->lock, flags); | |
66bee35f HG |
929 | |
930 | return ret; | |
74c5d09b DK |
931 | } |
932 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
933 | ||
934 | /** | |
6ab6094f CC |
935 | * extcon_unregister_notifier() - Unregister a notifier block from the extcon. |
936 | * @edev: the extcon device | |
937 | * @id: the unique id indicating an external connector | |
938 | * @nb: a notifier block to be registered | |
939 | * | |
940 | * Returns 0 if success or error number if fail. | |
74c5d09b | 941 | */ |
73b6ecdb | 942 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 943 | struct notifier_block *nb) |
74c5d09b | 944 | { |
66bee35f | 945 | unsigned long flags; |
046050f6 CC |
946 | int ret, idx; |
947 | ||
7eae43ae CC |
948 | if (!edev || !nb) |
949 | return -EINVAL; | |
950 | ||
046050f6 | 951 | idx = find_cable_index_by_id(edev, id); |
a05f44c8 SB |
952 | if (idx < 0) |
953 | return idx; | |
66bee35f HG |
954 | |
955 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 956 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
66bee35f HG |
957 | spin_unlock_irqrestore(&edev->lock, flags); |
958 | ||
959 | return ret; | |
74c5d09b DK |
960 | } |
961 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
962 | ||
815429b3 | 963 | /** |
6ab6094f CC |
964 | * extcon_register_notifier_all() - Register a notifier block for all connectors. |
965 | * @edev: the extcon device | |
966 | * @nb: a notifier block to be registered | |
815429b3 | 967 | * |
6ab6094f CC |
968 | * Note that this function registers a notifier block in order to receive |
969 | * the state change of all supported external connectors from extcon device. | |
826a47e9 | 970 | * And the second parameter given to the callback of nb (val) is |
6ab6094f | 971 | * the current state and the third pameter is the pointer of extcon device. |
815429b3 | 972 | * |
6ab6094f | 973 | * Returns 0 if success or error number if fail. |
815429b3 CC |
974 | */ |
975 | int extcon_register_notifier_all(struct extcon_dev *edev, | |
976 | struct notifier_block *nb) | |
977 | { | |
978 | unsigned long flags; | |
979 | int ret; | |
980 | ||
981 | if (!edev || !nb) | |
982 | return -EINVAL; | |
983 | ||
984 | spin_lock_irqsave(&edev->lock, flags); | |
985 | ret = raw_notifier_chain_register(&edev->nh_all, nb); | |
986 | spin_unlock_irqrestore(&edev->lock, flags); | |
987 | ||
988 | return ret; | |
989 | } | |
990 | EXPORT_SYMBOL_GPL(extcon_register_notifier_all); | |
991 | ||
992 | /** | |
993 | * extcon_unregister_notifier_all() - Unregister a notifier block from extcon. | |
6ab6094f CC |
994 | * @edev: the extcon device |
995 | * @nb: a notifier block to be registered | |
815429b3 | 996 | * |
6ab6094f | 997 | * Returns 0 if success or error number if fail. |
815429b3 CC |
998 | */ |
999 | int extcon_unregister_notifier_all(struct extcon_dev *edev, | |
1000 | struct notifier_block *nb) | |
1001 | { | |
1002 | unsigned long flags; | |
1003 | int ret; | |
1004 | ||
1005 | if (!edev || !nb) | |
1006 | return -EINVAL; | |
1007 | ||
1008 | spin_lock_irqsave(&edev->lock, flags); | |
1009 | ret = raw_notifier_chain_unregister(&edev->nh_all, nb); | |
1010 | spin_unlock_irqrestore(&edev->lock, flags); | |
1011 | ||
1012 | return ret; | |
1013 | } | |
1014 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all); | |
1015 | ||
af01da0e GKH |
1016 | static struct attribute *extcon_attrs[] = { |
1017 | &dev_attr_state.attr, | |
1018 | &dev_attr_name.attr, | |
1019 | NULL, | |
de55d871 | 1020 | }; |
af01da0e | 1021 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
1022 | |
1023 | static int create_extcon_class(void) | |
1024 | { | |
7f4c9bc2 BL |
1025 | if (extcon_class) |
1026 | return 0; | |
1027 | ||
1028 | extcon_class = class_create("extcon"); | |
1029 | if (IS_ERR(extcon_class)) | |
1030 | return PTR_ERR(extcon_class); | |
1031 | extcon_class->dev_groups = extcon_groups; | |
de55d871 MH |
1032 | |
1033 | return 0; | |
1034 | } | |
1035 | ||
de55d871 MH |
1036 | static void extcon_dev_release(struct device *dev) |
1037 | { | |
de55d871 MH |
1038 | } |
1039 | ||
bde68e60 | 1040 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
1041 | static void dummy_sysfs_dev_release(struct device *dev) |
1042 | { | |
1043 | } | |
1044 | ||
a9af6522 CC |
1045 | /* |
1046 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
6ab6094f CC |
1047 | * @supported_cable: the array of the supported external connectors |
1048 | * ending with EXTCON_NONE. | |
a9af6522 | 1049 | * |
6ab6094f CC |
1050 | * Note that this function allocates the memory for extcon device |
1051 | * and initialize default setting for the extcon device. | |
a9af6522 | 1052 | * |
6ab6094f CC |
1053 | * Returns the pointer memory of allocated extcon_dev if success |
1054 | * or ERR_PTR(err) if fail. | |
a9af6522 | 1055 | */ |
73b6ecdb | 1056 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
a9af6522 CC |
1057 | { |
1058 | struct extcon_dev *edev; | |
1059 | ||
7eae43ae CC |
1060 | if (!supported_cable) |
1061 | return ERR_PTR(-EINVAL); | |
1062 | ||
a9af6522 CC |
1063 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
1064 | if (!edev) | |
1065 | return ERR_PTR(-ENOMEM); | |
1066 | ||
1067 | edev->max_supported = 0; | |
1068 | edev->supported_cable = supported_cable; | |
1069 | ||
1070 | return edev; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * extcon_dev_free() - Free the memory of extcon device. | |
6ab6094f | 1075 | * @edev: the extcon device |
a9af6522 CC |
1076 | */ |
1077 | void extcon_dev_free(struct extcon_dev *edev) | |
1078 | { | |
1079 | kfree(edev); | |
1080 | } | |
1081 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
1082 | ||
3d9138e5 BL |
1083 | /** |
1084 | * extcon_alloc_cables() - alloc the cables for extcon device | |
1085 | * @edev: extcon device which has cables | |
1086 | * | |
1087 | * Returns 0 if success or error number if fail. | |
1088 | */ | |
1089 | static int extcon_alloc_cables(struct extcon_dev *edev) | |
1090 | { | |
1091 | int index; | |
1092 | char *str; | |
1093 | struct extcon_cable *cable; | |
1094 | ||
1095 | if (!edev) | |
1096 | return -EINVAL; | |
1097 | ||
1098 | if (!edev->max_supported) | |
1099 | return 0; | |
1100 | ||
ef753fb4 | 1101 | edev->cables = kcalloc(edev->max_supported, sizeof(*edev->cables), |
3d9138e5 BL |
1102 | GFP_KERNEL); |
1103 | if (!edev->cables) | |
1104 | return -ENOMEM; | |
1105 | ||
1106 | for (index = 0; index < edev->max_supported; index++) { | |
1107 | cable = &edev->cables[index]; | |
1108 | ||
1109 | str = kasprintf(GFP_KERNEL, "cable.%d", index); | |
1110 | if (!str) { | |
1111 | for (index--; index >= 0; index--) { | |
1112 | cable = &edev->cables[index]; | |
1113 | kfree(cable->attr_g.name); | |
1114 | } | |
1115 | ||
1116 | kfree(edev->cables); | |
1117 | return -ENOMEM; | |
1118 | } | |
1119 | ||
1120 | cable->edev = edev; | |
1121 | cable->cable_index = index; | |
1122 | cable->attrs[0] = &cable->attr_name.attr; | |
1123 | cable->attrs[1] = &cable->attr_state.attr; | |
1124 | cable->attrs[2] = NULL; | |
1125 | cable->attr_g.name = str; | |
1126 | cable->attr_g.attrs = cable->attrs; | |
1127 | ||
1128 | sysfs_attr_init(&cable->attr_name.attr); | |
1129 | cable->attr_name.attr.name = "name"; | |
1130 | cable->attr_name.attr.mode = 0444; | |
1131 | cable->attr_name.show = cable_name_show; | |
1132 | ||
1133 | sysfs_attr_init(&cable->attr_state.attr); | |
1134 | cable->attr_state.attr.name = "state"; | |
1135 | cable->attr_state.attr.mode = 0444; | |
1136 | cable->attr_state.show = cable_state_show; | |
1137 | } | |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
3e70a014 BL |
1142 | /** |
1143 | * extcon_alloc_muex() - alloc the mutual exclusive for extcon device | |
1144 | * @edev: extcon device | |
1145 | * | |
1146 | * Returns 0 if success or error number if fail. | |
1147 | */ | |
1148 | static int extcon_alloc_muex(struct extcon_dev *edev) | |
1149 | { | |
1150 | char *name; | |
1151 | int index; | |
1152 | ||
1153 | if (!edev) | |
1154 | return -EINVAL; | |
1155 | ||
1156 | if (!(edev->max_supported && edev->mutually_exclusive)) | |
1157 | return 0; | |
1158 | ||
1159 | /* Count the size of mutually_exclusive array */ | |
1160 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1161 | ; | |
1162 | ||
ef753fb4 | 1163 | edev->attrs_muex = kcalloc(index + 1, sizeof(*edev->attrs_muex), |
3e70a014 BL |
1164 | GFP_KERNEL); |
1165 | if (!edev->attrs_muex) | |
1166 | return -ENOMEM; | |
1167 | ||
ef753fb4 | 1168 | edev->d_attrs_muex = kcalloc(index, sizeof(*edev->d_attrs_muex), |
3e70a014 BL |
1169 | GFP_KERNEL); |
1170 | if (!edev->d_attrs_muex) { | |
1171 | kfree(edev->attrs_muex); | |
1172 | return -ENOMEM; | |
1173 | } | |
1174 | ||
1175 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
1176 | name = kasprintf(GFP_KERNEL, "0x%x", | |
1177 | edev->mutually_exclusive[index]); | |
1178 | if (!name) { | |
1179 | for (index--; index >= 0; index--) | |
1180 | kfree(edev->d_attrs_muex[index].attr.name); | |
1181 | ||
1182 | kfree(edev->d_attrs_muex); | |
1183 | kfree(edev->attrs_muex); | |
1184 | return -ENOMEM; | |
1185 | } | |
1186 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); | |
1187 | edev->d_attrs_muex[index].attr.name = name; | |
1188 | edev->d_attrs_muex[index].attr.mode = 0000; | |
1189 | edev->attrs_muex[index] = &edev->d_attrs_muex[index].attr; | |
1190 | } | |
1191 | edev->attr_g_muex.name = muex_name; | |
1192 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
1193 | ||
1194 | return 0; | |
1195 | } | |
1196 | ||
04151575 BL |
1197 | /** |
1198 | * extcon_alloc_groups() - alloc the groups for extcon device | |
1199 | * @edev: extcon device | |
1200 | * | |
1201 | * Returns 0 if success or error number if fail. | |
1202 | */ | |
1203 | static int extcon_alloc_groups(struct extcon_dev *edev) | |
1204 | { | |
1205 | int index; | |
1206 | ||
1207 | if (!edev) | |
1208 | return -EINVAL; | |
1209 | ||
1210 | if (!edev->max_supported) | |
1211 | return 0; | |
1212 | ||
1213 | edev->extcon_dev_type.groups = kcalloc(edev->max_supported + 2, | |
ef753fb4 AS |
1214 | sizeof(*edev->extcon_dev_type.groups), |
1215 | GFP_KERNEL); | |
04151575 BL |
1216 | if (!edev->extcon_dev_type.groups) |
1217 | return -ENOMEM; | |
1218 | ||
1219 | edev->extcon_dev_type.name = dev_name(&edev->dev); | |
1220 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; | |
1221 | ||
1222 | for (index = 0; index < edev->max_supported; index++) | |
1223 | edev->extcon_dev_type.groups[index] = &edev->cables[index].attr_g; | |
1224 | ||
1225 | if (edev->mutually_exclusive) | |
1226 | edev->extcon_dev_type.groups[index] = &edev->attr_g_muex; | |
1227 | ||
1228 | edev->dev.type = &edev->extcon_dev_type; | |
1229 | ||
1230 | return 0; | |
1231 | } | |
1232 | ||
de55d871 | 1233 | /** |
6ab6094f CC |
1234 | * extcon_dev_register() - Register an new extcon device |
1235 | * @edev: the extcon device to be registered | |
de55d871 MH |
1236 | * |
1237 | * Among the members of edev struct, please set the "user initializing data" | |
de55d871 MH |
1238 | * do not set the values of "internal data", which are initialized by |
1239 | * this function. | |
6ab6094f CC |
1240 | * |
1241 | * Note that before calling this funciton, have to allocate the memory | |
1242 | * of an extcon device by using the extcon_dev_allocate(). And the extcon | |
1243 | * dev should include the supported_cable information. | |
1244 | * | |
1245 | * Returns 0 if success or error number if fail. | |
de55d871 | 1246 | */ |
42d7d753 | 1247 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 1248 | { |
93e60cd5 | 1249 | int ret, index; |
de55d871 | 1250 | |
7f4c9bc2 BL |
1251 | ret = create_extcon_class(); |
1252 | if (ret < 0) | |
1253 | return ret; | |
de55d871 | 1254 | |
7eae43ae | 1255 | if (!edev || !edev->supported_cable) |
2a9de9c0 CC |
1256 | return -EINVAL; |
1257 | ||
93e60cd5 | 1258 | for (index = 0; edev->supported_cable[index] != EXTCON_NONE; index++); |
806d9dd7 | 1259 | |
2a9de9c0 | 1260 | edev->max_supported = index; |
806d9dd7 | 1261 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
1262 | dev_err(&edev->dev, |
1263 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
1264 | return -EINVAL; |
1265 | } | |
1266 | ||
dae61651 CC |
1267 | edev->dev.class = extcon_class; |
1268 | edev->dev.release = extcon_dev_release; | |
de55d871 | 1269 | |
71c3ffa5 | 1270 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
1271 | if (IS_ERR_OR_NULL(edev->name)) { |
1272 | dev_err(&edev->dev, | |
1273 | "extcon device name is null\n"); | |
1274 | return -EINVAL; | |
1275 | } | |
7bba9e81 AS |
1276 | |
1277 | ret = ida_alloc(&extcon_dev_ids, GFP_KERNEL); | |
1278 | if (ret < 0) | |
1279 | return ret; | |
1280 | ||
1281 | edev->id = ret; | |
1282 | ||
3d9138e5 BL |
1283 | ret = extcon_alloc_cables(edev); |
1284 | if (ret < 0) | |
1285 | goto err_alloc_cables; | |
806d9dd7 | 1286 | |
3e70a014 BL |
1287 | ret = extcon_alloc_muex(edev); |
1288 | if (ret < 0) | |
1289 | goto err_alloc_muex; | |
bde68e60 | 1290 | |
04151575 BL |
1291 | ret = extcon_alloc_groups(edev); |
1292 | if (ret < 0) | |
1293 | goto err_alloc_groups; | |
806d9dd7 | 1294 | |
806d9dd7 | 1295 | spin_lock_init(&edev->lock); |
5dcc2afe | 1296 | if (edev->max_supported) { |
1297 | edev->nh = kcalloc(edev->max_supported, sizeof(*edev->nh), | |
1298 | GFP_KERNEL); | |
1299 | if (!edev->nh) { | |
1300 | ret = -ENOMEM; | |
1301 | goto err_alloc_nh; | |
1302 | } | |
046050f6 CC |
1303 | } |
1304 | ||
1305 | for (index = 0; index < edev->max_supported; index++) | |
1306 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); | |
74c5d09b | 1307 | |
815429b3 CC |
1308 | RAW_INIT_NOTIFIER_HEAD(&edev->nh_all); |
1309 | ||
dae61651 | 1310 | dev_set_drvdata(&edev->dev, edev); |
e66523c7 | 1311 | dev_set_name(&edev->dev, "extcon%d", edev->id); |
de55d871 | 1312 | edev->state = 0; |
74c5d09b | 1313 | |
5dcc2afe | 1314 | ret = device_register(&edev->dev); |
1315 | if (ret) { | |
1316 | put_device(&edev->dev); | |
1317 | goto err_dev; | |
1318 | } | |
1319 | ||
74c5d09b DK |
1320 | mutex_lock(&extcon_dev_list_lock); |
1321 | list_add(&edev->entry, &extcon_dev_list); | |
1322 | mutex_unlock(&extcon_dev_list_lock); | |
1323 | ||
de55d871 MH |
1324 | return 0; |
1325 | ||
1326 | err_dev: | |
5dcc2afe | 1327 | if (edev->max_supported) |
1328 | kfree(edev->nh); | |
1329 | err_alloc_nh: | |
806d9dd7 MH |
1330 | if (edev->max_supported) |
1331 | kfree(edev->extcon_dev_type.groups); | |
1332 | err_alloc_groups: | |
bde68e60 MH |
1333 | if (edev->max_supported && edev->mutually_exclusive) { |
1334 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
1335 | kfree(edev->d_attrs_muex[index].attr.name); | |
1336 | kfree(edev->d_attrs_muex); | |
1337 | kfree(edev->attrs_muex); | |
1338 | } | |
3e70a014 | 1339 | err_alloc_muex: |
806d9dd7 MH |
1340 | for (index = 0; index < edev->max_supported; index++) |
1341 | kfree(edev->cables[index].attr_g.name); | |
806d9dd7 MH |
1342 | if (edev->max_supported) |
1343 | kfree(edev->cables); | |
3d9138e5 | 1344 | err_alloc_cables: |
7bba9e81 | 1345 | ida_free(&extcon_dev_ids, edev->id); |
3d9138e5 | 1346 | |
de55d871 MH |
1347 | return ret; |
1348 | } | |
1349 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
1350 | ||
1351 | /** | |
1352 | * extcon_dev_unregister() - Unregister the extcon device. | |
6ab6094f | 1353 | * @edev: the extcon device to be unregistered. |
de55d871 MH |
1354 | * |
1355 | * Note that this does not call kfree(edev) because edev was not allocated | |
1356 | * by this class. | |
1357 | */ | |
1358 | void extcon_dev_unregister(struct extcon_dev *edev) | |
1359 | { | |
57e7cd37 | 1360 | int index; |
1361 | ||
7eae43ae CC |
1362 | if (!edev) |
1363 | return; | |
1364 | ||
57e7cd37 | 1365 | mutex_lock(&extcon_dev_list_lock); |
1366 | list_del(&edev->entry); | |
1367 | mutex_unlock(&extcon_dev_list_lock); | |
1368 | ||
566825a3 AS |
1369 | if (!get_device(&edev->dev)) { |
1370 | dev_err(&edev->dev, "Failed to unregister extcon_dev\n"); | |
57e7cd37 | 1371 | return; |
1372 | } | |
1373 | ||
7bba9e81 AS |
1374 | ida_free(&extcon_dev_ids, edev->id); |
1375 | ||
7585ca0d WX |
1376 | device_unregister(&edev->dev); |
1377 | ||
57e7cd37 | 1378 | if (edev->mutually_exclusive && edev->max_supported) { |
1379 | for (index = 0; edev->mutually_exclusive[index]; | |
1380 | index++) | |
1381 | kfree(edev->d_attrs_muex[index].attr.name); | |
1382 | kfree(edev->d_attrs_muex); | |
1383 | kfree(edev->attrs_muex); | |
1384 | } | |
1385 | ||
1386 | for (index = 0; index < edev->max_supported; index++) | |
1387 | kfree(edev->cables[index].attr_g.name); | |
1388 | ||
1389 | if (edev->max_supported) { | |
1390 | kfree(edev->extcon_dev_type.groups); | |
1391 | kfree(edev->cables); | |
5dcc2afe | 1392 | kfree(edev->nh); |
57e7cd37 | 1393 | } |
1394 | ||
dae61651 | 1395 | put_device(&edev->dev); |
de55d871 MH |
1396 | } |
1397 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
1398 | ||
1ad94ffe | 1399 | #ifdef CONFIG_OF |
370ed7a9 AH |
1400 | |
1401 | /* | |
1402 | * extcon_find_edev_by_node - Find the extcon device from devicetree. | |
1403 | * @node : OF node identifying edev | |
1404 | * | |
1405 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. | |
1406 | */ | |
1407 | struct extcon_dev *extcon_find_edev_by_node(struct device_node *node) | |
1408 | { | |
1409 | struct extcon_dev *edev; | |
1410 | ||
1411 | mutex_lock(&extcon_dev_list_lock); | |
1412 | list_for_each_entry(edev, &extcon_dev_list, entry) | |
0146f56b | 1413 | if (edev->dev.parent && device_match_of_node(edev->dev.parent, node)) |
370ed7a9 AH |
1414 | goto out; |
1415 | edev = ERR_PTR(-EPROBE_DEFER); | |
1416 | out: | |
1417 | mutex_unlock(&extcon_dev_list_lock); | |
1418 | ||
1419 | return edev; | |
1420 | } | |
1421 | ||
1ad94ffe | 1422 | /* |
6ab6094f CC |
1423 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree. |
1424 | * @dev : the instance to the given device | |
1425 | * @index : the index into list of extcon_dev | |
1ad94ffe | 1426 | * |
6ab6094f | 1427 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. |
1ad94ffe CC |
1428 | */ |
1429 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
1430 | { | |
9b4aea51 | 1431 | struct device_node *node, *np = dev_of_node(dev); |
1ad94ffe CC |
1432 | struct extcon_dev *edev; |
1433 | ||
9b4aea51 | 1434 | if (!np) { |
e8752b7a | 1435 | dev_dbg(dev, "device does not have a device node entry\n"); |
1ad94ffe CC |
1436 | return ERR_PTR(-EINVAL); |
1437 | } | |
1438 | ||
9b4aea51 | 1439 | node = of_parse_phandle(np, "extcon", index); |
1ad94ffe | 1440 | if (!node) { |
9b4aea51 | 1441 | dev_dbg(dev, "failed to get phandle in %pOF node\n", np); |
1ad94ffe CC |
1442 | return ERR_PTR(-ENODEV); |
1443 | } | |
1444 | ||
370ed7a9 | 1445 | edev = extcon_find_edev_by_node(node); |
5d5c4c13 | 1446 | of_node_put(node); |
1ad94ffe | 1447 | |
370ed7a9 | 1448 | return edev; |
1ad94ffe | 1449 | } |
370ed7a9 | 1450 | |
1ad94ffe | 1451 | #else |
370ed7a9 AH |
1452 | |
1453 | struct extcon_dev *extcon_find_edev_by_node(struct device_node *node) | |
1454 | { | |
1455 | return ERR_PTR(-ENOSYS); | |
1456 | } | |
1457 | ||
1ad94ffe CC |
1458 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) |
1459 | { | |
1460 | return ERR_PTR(-ENOSYS); | |
1461 | } | |
370ed7a9 | 1462 | |
1ad94ffe | 1463 | #endif /* CONFIG_OF */ |
370ed7a9 AH |
1464 | |
1465 | EXPORT_SYMBOL_GPL(extcon_find_edev_by_node); | |
1ad94ffe CC |
1466 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); |
1467 | ||
707d7550 CC |
1468 | /** |
1469 | * extcon_get_edev_name() - Get the name of the extcon device. | |
1470 | * @edev: the extcon device | |
1471 | */ | |
1472 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
1473 | { | |
1474 | return !edev ? NULL : edev->name; | |
1475 | } | |
995bb109 | 1476 | EXPORT_SYMBOL_GPL(extcon_get_edev_name); |
707d7550 | 1477 | |
de55d871 MH |
1478 | static int __init extcon_class_init(void) |
1479 | { | |
1480 | return create_extcon_class(); | |
1481 | } | |
1482 | module_init(extcon_class_init); | |
1483 | ||
1484 | static void __exit extcon_class_exit(void) | |
1485 | { | |
1486 | class_destroy(extcon_class); | |
1487 | } | |
1488 | module_exit(extcon_class_exit); | |
1489 | ||
2a9de9c0 | 1490 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 | 1491 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
6ab6094f CC |
1492 | MODULE_DESCRIPTION("External Connector (extcon) framework"); |
1493 | MODULE_LICENSE("GPL v2"); |