1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * drivers/extcon/extcon.c - External Connector (extcon) framework. |
4 | * |
5 | * Copyright (C) 2015 Samsung Electronics |
6 | * Author: Chanwoo Choi <cw00.choi@samsung.com> |
7 | * |
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> |
15 | */ |
16 | |
17 | #include <linux/module.h> |
18 | #include <linux/types.h> |
19 | #include <linux/idr.h> |
20 | #include <linux/init.h> |
21 | #include <linux/device.h> |
22 | #include <linux/fs.h> |
23 | #include <linux/err.h> |
24 | #include <linux/of.h> |
25 | #include <linux/slab.h> |
26 | #include <linux/sysfs.h> |
27 | |
28 | #include "extcon.h" |
29 | |
30 | #define SUPPORTED_CABLE_MAX 32 |
31 | |
32 | static const struct __extcon_info { |
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 | }, |
43 | |
44 | /* USB external connector */ |
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, |
53 | .name = "USB-HOST" , |
54 | }, |
55 | |
56 | /* Charging external connector */ |
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 | }, |
87 | [EXTCON_CHG_WPT] = { |
88 | .type = EXTCON_TYPE_CHG, |
89 | .id = EXTCON_CHG_WPT, |
90 | .name = "WPT" , |
91 | }, |
92 | [EXTCON_CHG_USB_PD] = { |
93 | .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, |
94 | .id = EXTCON_CHG_USB_PD, |
95 | .name = "PD" , |
96 | }, |
97 | |
98 | /* Jack external connector */ |
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 | }, |
139 | |
140 | /* Display external connector */ |
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 | }, |
161 | [EXTCON_DISP_DP] = { |
162 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, |
163 | .id = EXTCON_DISP_DP, |
164 | .name = "DP" , |
165 | }, |
166 | [EXTCON_DISP_HMD] = { |
167 | .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, |
168 | .id = EXTCON_DISP_HMD, |
169 | .name = "HMD" , |
170 | }, |
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 | }, |
181 | |
182 | /* Miscellaneous external connector */ |
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 */ } |
200 | }; |
201 | |
202 | /** |
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 |
207 | * @attr_name: "name" sysfs entry |
208 | * @attr_state: "state" sysfs entry |
209 | * @attrs: the array pointing to attr_name and attr_state for attr_g |
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 |
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 |
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 */ |
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]; |
233 | |
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); |
238 | }; |
239 | |
240 | static struct class *extcon_class; |
241 | |
242 | static DEFINE_IDA(extcon_dev_ids); |
243 | static LIST_HEAD(extcon_dev_list); |
244 | static DEFINE_MUTEX(extcon_dev_list_lock); |
245 | |
246 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) |
247 | { |
248 | int i; |
249 | |
250 | if (!edev->mutually_exclusive) |
251 | return 0; |
252 | |
253 | for (i = 0; edev->mutually_exclusive[i]; i++) { |
254 | int weight; |
255 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
256 | |
257 | /* calculate the total number of bits set */ |
258 | weight = hweight32(correspondants); |
259 | if (weight > 1) |
260 | return i + 1; |
261 | } |
262 | |
263 | return 0; |
264 | } |
265 | |
266 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
267 | { |
268 | int i; |
269 | |
270 | /* Find 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 | |
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 | |
300 | static bool is_extcon_changed(struct extcon_dev *edev, int index, |
301 | bool new_state) |
302 | { |
303 | int state = !!(edev->state & BIT(index)); |
304 | return (state != new_state); |
305 | } |
306 | |
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 | |
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 | |
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 | |
368 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
369 | char *buf) |
370 | { |
371 | int i, count = 0; |
372 | struct extcon_dev *edev = dev_get_drvdata(dev); |
373 | |
374 | if (edev->max_supported == 0) |
375 | return sysfs_emit(buf, fmt: "%u\n" , edev->state); |
376 | |
377 | for (i = 0; i < edev->max_supported; i++) { |
378 | count += sysfs_emit_at(buf, at: count, fmt: "%s=%d\n" , |
379 | extcon_info[edev->supported_cable[i]].name, |
380 | !!(edev->state & BIT(i))); |
381 | } |
382 | |
383 | return count; |
384 | } |
385 | static DEVICE_ATTR_RO(state); |
386 | |
387 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
388 | char *buf) |
389 | { |
390 | struct extcon_dev *edev = dev_get_drvdata(dev); |
391 | |
392 | return sysfs_emit(buf, fmt: "%s\n" , edev->name); |
393 | } |
394 | static DEVICE_ATTR_RO(name); |
395 | |
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); |
401 | int i = cable->cable_index; |
402 | |
403 | return sysfs_emit(buf, fmt: "%s\n" , |
404 | extcon_info[cable->edev->supported_cable[i]].name); |
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 | |
413 | int i = cable->cable_index; |
414 | |
415 | return sysfs_emit(buf, fmt: "%d\n" , |
416 | extcon_get_state(edev: cable->edev, id: cable->edev->supported_cable[i])); |
417 | } |
418 | |
419 | /** |
420 | * extcon_sync() - Synchronize the state for an external connector. |
421 | * @edev: the extcon device |
422 | * @id: the unique id indicating an external connector |
423 | * |
424 | * Note that this function send a notification in order to synchronize |
425 | * the state and property of an external connector. |
426 | * |
427 | * Returns 0 if success or error number if fail. |
428 | */ |
429 | int extcon_sync(struct extcon_dev *edev, unsigned int id) |
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; |
437 | int index; |
438 | int state; |
439 | unsigned long flags; |
440 | |
441 | if (!edev) |
442 | return -EINVAL; |
443 | |
444 | index = find_cable_index_by_id(edev, id); |
445 | if (index < 0) |
446 | return index; |
447 | |
448 | spin_lock_irqsave(&edev->lock, flags); |
449 | state = !!(edev->state & BIT(index)); |
450 | spin_unlock_irqrestore(lock: &edev->lock, flags); |
451 | |
452 | /* |
453 | * Call functions in a raw notifier chain for the specific one |
454 | * external connector. |
455 | */ |
456 | raw_notifier_call_chain(nh: &edev->nh[index], val: state, v: edev); |
457 | |
458 | /* |
459 | * Call functions in a raw notifier chain for the all supported |
460 | * external connectors. |
461 | */ |
462 | raw_notifier_call_chain(nh: &edev->nh_all, val: state, v: edev); |
463 | |
464 | spin_lock_irqsave(&edev->lock, flags); |
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 */ |
469 | spin_unlock_irqrestore(lock: &edev->lock, flags); |
470 | |
471 | dev_err(&edev->dev, "out of memory in extcon_set_state\n" ); |
472 | kobject_uevent(kobj: &edev->dev.kobj, action: KOBJ_CHANGE); |
473 | |
474 | return -ENOMEM; |
475 | } |
476 | |
477 | length = name_show(dev: &edev->dev, NULL, buf: prop_buf); |
478 | if (length > 0) { |
479 | if (prop_buf[length - 1] == '\n') |
480 | prop_buf[length - 1] = 0; |
481 | snprintf(buf: name_buf, size: sizeof(name_buf), fmt: "NAME=%s" , prop_buf); |
482 | envp[env_offset++] = name_buf; |
483 | } |
484 | |
485 | length = state_show(dev: &edev->dev, NULL, buf: prop_buf); |
486 | if (length > 0) { |
487 | if (prop_buf[length - 1] == '\n') |
488 | prop_buf[length - 1] = 0; |
489 | snprintf(buf: state_buf, size: sizeof(state_buf), fmt: "STATE=%s" , prop_buf); |
490 | envp[env_offset++] = state_buf; |
491 | } |
492 | envp[env_offset] = NULL; |
493 | |
494 | /* Unlock early before uevent */ |
495 | spin_unlock_irqrestore(lock: &edev->lock, flags); |
496 | kobject_uevent_env(kobj: &edev->dev.kobj, action: KOBJ_CHANGE, envp); |
497 | free_page((unsigned long)prop_buf); |
498 | |
499 | return 0; |
500 | } |
501 | EXPORT_SYMBOL_GPL(extcon_sync); |
502 | |
503 | /** |
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. |
509 | */ |
510 | int extcon_get_state(struct extcon_dev *edev, const unsigned int id) |
511 | { |
512 | int index, state; |
513 | unsigned long flags; |
514 | |
515 | if (!edev) |
516 | return -EINVAL; |
517 | |
518 | index = find_cable_index_by_id(edev, id); |
519 | if (index < 0) |
520 | return index; |
521 | |
522 | spin_lock_irqsave(&edev->lock, flags); |
523 | state = is_extcon_attached(edev, index); |
524 | spin_unlock_irqrestore(lock: &edev->lock, flags); |
525 | |
526 | return state; |
527 | } |
528 | EXPORT_SYMBOL_GPL(extcon_get_state); |
529 | |
530 | /** |
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(). |
540 | * |
541 | * Returns 0 if success or error number if fail. |
542 | */ |
543 | int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state) |
544 | { |
545 | unsigned long flags; |
546 | int index, ret = 0; |
547 | |
548 | if (!edev) |
549 | return -EINVAL; |
550 | |
551 | index = find_cable_index_by_id(edev, id); |
552 | if (index < 0) |
553 | return index; |
554 | |
555 | spin_lock_irqsave(&edev->lock, flags); |
556 | |
557 | /* Check whether the external connector's state is changed. */ |
558 | if (!is_extcon_changed(edev, index, new_state: state)) |
559 | goto out; |
560 | |
561 | if (check_mutually_exclusive(edev, |
562 | new_state: (edev->state & ~BIT(index)) | (state & BIT(index)))) { |
563 | ret = -EPERM; |
564 | goto out; |
565 | } |
566 | |
567 | /* |
568 | * Initialize the value of extcon property before setting |
569 | * the detached state for an external connector. |
570 | */ |
571 | if (!state) |
572 | init_property(edev, id, index); |
573 | |
574 | /* Update the state for an external connector. */ |
575 | if (state) |
576 | edev->state |= BIT(index); |
577 | else |
578 | edev->state &= ~(BIT(index)); |
579 | out: |
580 | spin_unlock_irqrestore(lock: &edev->lock, flags); |
581 | |
582 | return ret; |
583 | } |
584 | EXPORT_SYMBOL_GPL(extcon_set_state); |
585 | |
586 | /** |
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. |
595 | * |
596 | * Returns 0 if success or error number if fail. |
597 | */ |
598 | int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state) |
599 | { |
600 | int ret; |
601 | |
602 | ret = extcon_set_state(edev, id, state); |
603 | if (ret < 0) |
604 | return ret; |
605 | |
606 | return extcon_sync(edev, id); |
607 | } |
608 | EXPORT_SYMBOL_GPL(extcon_set_state_sync); |
609 | |
610 | /** |
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 |
616 | * |
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. |
621 | * |
622 | * Returns 0 if success or error number if fail. |
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 | |
632 | *prop_val = (union extcon_property_value){0}; |
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 | |
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 | |
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 | /** |
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 |
697 | * |
698 | * Note that each property should be included in the list of supported |
699 | * properties according to the extcon type. |
700 | * |
701 | * Returns 0 if success or error number if fail. |
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 | |
725 | /* Check whether the property is available or not. */ |
726 | if (!is_extcon_property_capability(edev, id, index, prop)) { |
727 | spin_unlock_irqrestore(lock: &edev->lock, flags); |
728 | return -EPERM; |
729 | } |
730 | |
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(lock: &edev->lock, flags); |
753 | |
754 | return ret; |
755 | } |
756 | EXPORT_SYMBOL_GPL(extcon_set_property); |
757 | |
758 | /** |
759 | * extcon_set_property_sync() - Set property of an external connector with sync. |
760 | * @edev: the extcon device |
761 | * @id: the unique id indicating an external connector |
762 | * @prop: the property id indicating an extcon property |
763 | * @prop_val: the pointer including the new value of extcon property |
764 | * |
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. |
768 | * |
769 | * Returns 0 if success or error number if fail. |
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 | |
785 | /** |
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 |
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 | /** |
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 |
821 | * |
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. |
825 | * |
826 | * Returns 0 if success or error number if fail. |
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 | |
873 | /** |
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. |
878 | * NOTE: This function returns -EPROBE_DEFER so it may only be called from |
879 | * probe() functions. |
880 | */ |
881 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) |
882 | { |
883 | struct extcon_dev *sd; |
884 | |
885 | if (!extcon_name) |
886 | return ERR_PTR(error: -EINVAL); |
887 | |
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 | } |
893 | sd = ERR_PTR(error: -EPROBE_DEFER); |
894 | out: |
895 | mutex_unlock(lock: &extcon_dev_list_lock); |
896 | return sd; |
897 | } |
898 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); |
899 | |
900 | /** |
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 |
906 | * |
907 | * Note that the second parameter given to the callback of nb (val) is |
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. |
912 | */ |
913 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
914 | struct notifier_block *nb) |
915 | { |
916 | unsigned long flags; |
917 | int ret, idx; |
918 | |
919 | if (!edev || !nb) |
920 | return -EINVAL; |
921 | |
922 | idx = find_cable_index_by_id(edev, id); |
923 | if (idx < 0) |
924 | return idx; |
925 | |
926 | spin_lock_irqsave(&edev->lock, flags); |
927 | ret = raw_notifier_chain_register(nh: &edev->nh[idx], nb); |
928 | spin_unlock_irqrestore(lock: &edev->lock, flags); |
929 | |
930 | return ret; |
931 | } |
932 | EXPORT_SYMBOL_GPL(extcon_register_notifier); |
933 | |
934 | /** |
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. |
941 | */ |
942 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
943 | struct notifier_block *nb) |
944 | { |
945 | unsigned long flags; |
946 | int ret, idx; |
947 | |
948 | if (!edev || !nb) |
949 | return -EINVAL; |
950 | |
951 | idx = find_cable_index_by_id(edev, id); |
952 | if (idx < 0) |
953 | return idx; |
954 | |
955 | spin_lock_irqsave(&edev->lock, flags); |
956 | ret = raw_notifier_chain_unregister(nh: &edev->nh[idx], nb); |
957 | spin_unlock_irqrestore(lock: &edev->lock, flags); |
958 | |
959 | return ret; |
960 | } |
961 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); |
962 | |
963 | /** |
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 |
967 | * |
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. |
970 | * And the second parameter given to the callback of nb (val) is |
971 | * the current state and the third pameter is the pointer of extcon device. |
972 | * |
973 | * Returns 0 if success or error number if fail. |
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(nh: &edev->nh_all, nb); |
986 | spin_unlock_irqrestore(lock: &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. |
994 | * @edev: the extcon device |
995 | * @nb: a notifier block to be registered |
996 | * |
997 | * Returns 0 if success or error number if fail. |
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(nh: &edev->nh_all, nb); |
1010 | spin_unlock_irqrestore(lock: &edev->lock, flags); |
1011 | |
1012 | return ret; |
1013 | } |
1014 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all); |
1015 | |
1016 | static struct attribute *extcon_attrs[] = { |
1017 | &dev_attr_state.attr, |
1018 | &dev_attr_name.attr, |
1019 | NULL, |
1020 | }; |
1021 | ATTRIBUTE_GROUPS(extcon); |
1022 | |
1023 | static int create_extcon_class(void) |
1024 | { |
1025 | if (extcon_class) |
1026 | return 0; |
1027 | |
1028 | extcon_class = class_create(name: "extcon" ); |
1029 | if (IS_ERR(ptr: extcon_class)) |
1030 | return PTR_ERR(ptr: extcon_class); |
1031 | extcon_class->dev_groups = extcon_groups; |
1032 | |
1033 | return 0; |
1034 | } |
1035 | |
1036 | static void extcon_dev_release(struct device *dev) |
1037 | { |
1038 | } |
1039 | |
1040 | static const char *muex_name = "mutually_exclusive" ; |
1041 | static void dummy_sysfs_dev_release(struct device *dev) |
1042 | { |
1043 | } |
1044 | |
1045 | /* |
1046 | * extcon_dev_allocate() - Allocate the memory of extcon device. |
1047 | * @supported_cable: the array of the supported external connectors |
1048 | * ending with EXTCON_NONE. |
1049 | * |
1050 | * Note that this function allocates the memory for extcon device |
1051 | * and initialize default setting for the extcon device. |
1052 | * |
1053 | * Returns the pointer memory of allocated extcon_dev if success |
1054 | * or ERR_PTR(err) if fail. |
1055 | */ |
1056 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
1057 | { |
1058 | struct extcon_dev *edev; |
1059 | |
1060 | if (!supported_cable) |
1061 | return ERR_PTR(error: -EINVAL); |
1062 | |
1063 | edev = kzalloc(size: sizeof(*edev), GFP_KERNEL); |
1064 | if (!edev) |
1065 | return ERR_PTR(error: -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. |
1075 | * @edev: the extcon device |
1076 | */ |
1077 | void extcon_dev_free(struct extcon_dev *edev) |
1078 | { |
1079 | kfree(objp: edev); |
1080 | } |
1081 | EXPORT_SYMBOL_GPL(extcon_dev_free); |
1082 | |
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 | |
1101 | edev->cables = kcalloc(n: edev->max_supported, size: sizeof(*edev->cables), |
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, fmt: "cable.%d" , index); |
1110 | if (!str) { |
1111 | for (index--; index >= 0; index--) { |
1112 | cable = &edev->cables[index]; |
1113 | kfree(objp: cable->attr_g.name); |
1114 | } |
1115 | |
1116 | kfree(objp: 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 | |
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 | |
1163 | edev->attrs_muex = kcalloc(n: index + 1, size: sizeof(*edev->attrs_muex), |
1164 | GFP_KERNEL); |
1165 | if (!edev->attrs_muex) |
1166 | return -ENOMEM; |
1167 | |
1168 | edev->d_attrs_muex = kcalloc(n: index, size: sizeof(*edev->d_attrs_muex), |
1169 | GFP_KERNEL); |
1170 | if (!edev->d_attrs_muex) { |
1171 | kfree(objp: edev->attrs_muex); |
1172 | return -ENOMEM; |
1173 | } |
1174 | |
1175 | for (index = 0; edev->mutually_exclusive[index]; index++) { |
1176 | name = kasprintf(GFP_KERNEL, fmt: "0x%x" , |
1177 | edev->mutually_exclusive[index]); |
1178 | if (!name) { |
1179 | for (index--; index >= 0; index--) |
1180 | kfree(objp: edev->d_attrs_muex[index].attr.name); |
1181 | |
1182 | kfree(objp: edev->d_attrs_muex); |
1183 | kfree(objp: 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 | |
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(n: edev->max_supported + 2, |
1214 | size: sizeof(*edev->extcon_dev_type.groups), |
1215 | GFP_KERNEL); |
1216 | if (!edev->extcon_dev_type.groups) |
1217 | return -ENOMEM; |
1218 | |
1219 | edev->extcon_dev_type.name = dev_name(dev: &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 | |
1233 | /** |
1234 | * extcon_dev_register() - Register an new extcon device |
1235 | * @edev: the extcon device to be registered |
1236 | * |
1237 | * Among the members of edev struct, please set the "user initializing data" |
1238 | * do not set the values of "internal data", which are initialized by |
1239 | * this function. |
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. |
1246 | */ |
1247 | int extcon_dev_register(struct extcon_dev *edev) |
1248 | { |
1249 | int ret, index; |
1250 | |
1251 | ret = create_extcon_class(); |
1252 | if (ret < 0) |
1253 | return ret; |
1254 | |
1255 | if (!edev || !edev->supported_cable) |
1256 | return -EINVAL; |
1257 | |
1258 | for (index = 0; edev->supported_cable[index] != EXTCON_NONE; index++); |
1259 | |
1260 | edev->max_supported = index; |
1261 | if (index > SUPPORTED_CABLE_MAX) { |
1262 | dev_err(&edev->dev, |
1263 | "exceed the maximum number of supported cables\n" ); |
1264 | return -EINVAL; |
1265 | } |
1266 | |
1267 | edev->dev.class = extcon_class; |
1268 | edev->dev.release = extcon_dev_release; |
1269 | |
1270 | edev->name = dev_name(dev: edev->dev.parent); |
1271 | if (IS_ERR_OR_NULL(ptr: edev->name)) { |
1272 | dev_err(&edev->dev, |
1273 | "extcon device name is null\n" ); |
1274 | return -EINVAL; |
1275 | } |
1276 | |
1277 | ret = ida_alloc(ida: &extcon_dev_ids, GFP_KERNEL); |
1278 | if (ret < 0) |
1279 | return ret; |
1280 | |
1281 | edev->id = ret; |
1282 | |
1283 | dev_set_name(dev: &edev->dev, name: "extcon%d" , edev->id); |
1284 | |
1285 | ret = extcon_alloc_cables(edev); |
1286 | if (ret < 0) |
1287 | goto err_alloc_cables; |
1288 | |
1289 | ret = extcon_alloc_muex(edev); |
1290 | if (ret < 0) |
1291 | goto err_alloc_muex; |
1292 | |
1293 | ret = extcon_alloc_groups(edev); |
1294 | if (ret < 0) |
1295 | goto err_alloc_groups; |
1296 | |
1297 | spin_lock_init(&edev->lock); |
1298 | if (edev->max_supported) { |
1299 | edev->nh = kcalloc(n: edev->max_supported, size: sizeof(*edev->nh), |
1300 | GFP_KERNEL); |
1301 | if (!edev->nh) { |
1302 | ret = -ENOMEM; |
1303 | goto err_alloc_nh; |
1304 | } |
1305 | } |
1306 | |
1307 | for (index = 0; index < edev->max_supported; index++) |
1308 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); |
1309 | |
1310 | RAW_INIT_NOTIFIER_HEAD(&edev->nh_all); |
1311 | |
1312 | dev_set_drvdata(dev: &edev->dev, data: edev); |
1313 | edev->state = 0; |
1314 | |
1315 | ret = device_register(dev: &edev->dev); |
1316 | if (ret) { |
1317 | put_device(dev: &edev->dev); |
1318 | goto err_dev; |
1319 | } |
1320 | |
1321 | mutex_lock(&extcon_dev_list_lock); |
1322 | list_add(new: &edev->entry, head: &extcon_dev_list); |
1323 | mutex_unlock(lock: &extcon_dev_list_lock); |
1324 | |
1325 | return 0; |
1326 | |
1327 | err_dev: |
1328 | if (edev->max_supported) |
1329 | kfree(objp: edev->nh); |
1330 | err_alloc_nh: |
1331 | if (edev->max_supported) |
1332 | kfree(objp: edev->extcon_dev_type.groups); |
1333 | err_alloc_groups: |
1334 | if (edev->max_supported && edev->mutually_exclusive) { |
1335 | for (index = 0; edev->mutually_exclusive[index]; index++) |
1336 | kfree(objp: edev->d_attrs_muex[index].attr.name); |
1337 | kfree(objp: edev->d_attrs_muex); |
1338 | kfree(objp: edev->attrs_muex); |
1339 | } |
1340 | err_alloc_muex: |
1341 | for (index = 0; index < edev->max_supported; index++) |
1342 | kfree(objp: edev->cables[index].attr_g.name); |
1343 | if (edev->max_supported) |
1344 | kfree(objp: edev->cables); |
1345 | err_alloc_cables: |
1346 | ida_free(&extcon_dev_ids, id: edev->id); |
1347 | |
1348 | return ret; |
1349 | } |
1350 | EXPORT_SYMBOL_GPL(extcon_dev_register); |
1351 | |
1352 | /** |
1353 | * extcon_dev_unregister() - Unregister the extcon device. |
1354 | * @edev: the extcon device to be unregistered. |
1355 | * |
1356 | * Note that this does not call kfree(edev) because edev was not allocated |
1357 | * by this class. |
1358 | */ |
1359 | void extcon_dev_unregister(struct extcon_dev *edev) |
1360 | { |
1361 | int index; |
1362 | |
1363 | if (!edev) |
1364 | return; |
1365 | |
1366 | mutex_lock(&extcon_dev_list_lock); |
1367 | list_del(entry: &edev->entry); |
1368 | mutex_unlock(lock: &extcon_dev_list_lock); |
1369 | |
1370 | if (!get_device(dev: &edev->dev)) { |
1371 | dev_err(&edev->dev, "Failed to unregister extcon_dev\n" ); |
1372 | return; |
1373 | } |
1374 | |
1375 | ida_free(&extcon_dev_ids, id: edev->id); |
1376 | |
1377 | device_unregister(dev: &edev->dev); |
1378 | |
1379 | if (edev->mutually_exclusive && edev->max_supported) { |
1380 | for (index = 0; edev->mutually_exclusive[index]; |
1381 | index++) |
1382 | kfree(objp: edev->d_attrs_muex[index].attr.name); |
1383 | kfree(objp: edev->d_attrs_muex); |
1384 | kfree(objp: edev->attrs_muex); |
1385 | } |
1386 | |
1387 | for (index = 0; index < edev->max_supported; index++) |
1388 | kfree(objp: edev->cables[index].attr_g.name); |
1389 | |
1390 | if (edev->max_supported) { |
1391 | kfree(objp: edev->extcon_dev_type.groups); |
1392 | kfree(objp: edev->cables); |
1393 | kfree(objp: edev->nh); |
1394 | } |
1395 | |
1396 | put_device(dev: &edev->dev); |
1397 | } |
1398 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); |
1399 | |
1400 | #ifdef CONFIG_OF |
1401 | |
1402 | /* |
1403 | * extcon_find_edev_by_node - Find the extcon device from devicetree. |
1404 | * @node : OF node identifying edev |
1405 | * |
1406 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. |
1407 | */ |
1408 | struct extcon_dev *extcon_find_edev_by_node(struct device_node *node) |
1409 | { |
1410 | struct extcon_dev *edev; |
1411 | |
1412 | mutex_lock(&extcon_dev_list_lock); |
1413 | list_for_each_entry(edev, &extcon_dev_list, entry) |
1414 | if (edev->dev.parent && device_match_of_node(dev: edev->dev.parent, np: node)) |
1415 | goto out; |
1416 | edev = ERR_PTR(error: -EPROBE_DEFER); |
1417 | out: |
1418 | mutex_unlock(lock: &extcon_dev_list_lock); |
1419 | |
1420 | return edev; |
1421 | } |
1422 | |
1423 | /* |
1424 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree. |
1425 | * @dev : the instance to the given device |
1426 | * @index : the index into list of extcon_dev |
1427 | * |
1428 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail. |
1429 | */ |
1430 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) |
1431 | { |
1432 | struct device_node *node, *np = dev_of_node(dev); |
1433 | struct extcon_dev *edev; |
1434 | |
1435 | if (!np) { |
1436 | dev_dbg(dev, "device does not have a device node entry\n" ); |
1437 | return ERR_PTR(error: -EINVAL); |
1438 | } |
1439 | |
1440 | node = of_parse_phandle(np, phandle_name: "extcon" , index); |
1441 | if (!node) { |
1442 | dev_dbg(dev, "failed to get phandle in %pOF node\n" , np); |
1443 | return ERR_PTR(error: -ENODEV); |
1444 | } |
1445 | |
1446 | edev = extcon_find_edev_by_node(node); |
1447 | of_node_put(node); |
1448 | |
1449 | return edev; |
1450 | } |
1451 | |
1452 | #else |
1453 | |
1454 | struct extcon_dev *extcon_find_edev_by_node(struct device_node *node) |
1455 | { |
1456 | return ERR_PTR(-ENOSYS); |
1457 | } |
1458 | |
1459 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) |
1460 | { |
1461 | return ERR_PTR(-ENOSYS); |
1462 | } |
1463 | |
1464 | #endif /* CONFIG_OF */ |
1465 | |
1466 | EXPORT_SYMBOL_GPL(extcon_find_edev_by_node); |
1467 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); |
1468 | |
1469 | /** |
1470 | * extcon_get_edev_name() - Get the name of the extcon device. |
1471 | * @edev: the extcon device |
1472 | */ |
1473 | const char *extcon_get_edev_name(struct extcon_dev *edev) |
1474 | { |
1475 | return !edev ? NULL : edev->name; |
1476 | } |
1477 | EXPORT_SYMBOL_GPL(extcon_get_edev_name); |
1478 | |
1479 | static int __init extcon_class_init(void) |
1480 | { |
1481 | return create_extcon_class(); |
1482 | } |
1483 | module_init(extcon_class_init); |
1484 | |
1485 | static void __exit extcon_class_exit(void) |
1486 | { |
1487 | class_destroy(cls: extcon_class); |
1488 | } |
1489 | module_exit(extcon_class_exit); |
1490 | |
1491 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>" ); |
1492 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>" ); |
1493 | MODULE_DESCRIPTION("External Connector (extcon) framework" ); |
1494 | MODULE_LICENSE("GPL v2" ); |
1495 | |