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Commit | Line | Data |
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de55d871 | 1 | /* |
b9ec23c0 | 2 | * drivers/extcon/extcon.c - External Connector (extcon) framework. |
de55d871 MH |
3 | * |
4 | * External connector (extcon) class driver | |
5 | * | |
2a9de9c0 CC |
6 | * Copyright (C) 2015 Samsung Electronics |
7 | * Author: Chanwoo Choi <cw00.choi@samsung.com> | |
8 | * | |
de55d871 MH |
9 | * Copyright (C) 2012 Samsung Electronics |
10 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
11 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
12 | * | |
13 | * based on android/drivers/switch/switch_class.c | |
14 | * Copyright (C) 2008 Google, Inc. | |
15 | * Author: Mike Lockwood <lockwood@android.com> | |
16 | * | |
17 | * This software is licensed under the terms of the GNU General Public | |
18 | * License version 2, as published by the Free Software Foundation, and | |
19 | * may be copied, distributed, and modified under those terms. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
b9ec23c0 | 25 | */ |
de55d871 MH |
26 | |
27 | #include <linux/module.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/fs.h> | |
32 | #include <linux/err.h> | |
33 | #include <linux/extcon.h> | |
f841afb1 | 34 | #include <linux/of.h> |
de55d871 | 35 | #include <linux/slab.h> |
9baf3220 | 36 | #include <linux/sysfs.h> |
de55d871 | 37 | |
2a9de9c0 CC |
38 | #define SUPPORTED_CABLE_MAX 32 |
39 | #define CABLE_NAME_MAX 30 | |
40 | ||
41 | static const char *extcon_name[] = { | |
11eecf91 | 42 | [EXTCON_NONE] = "NONE", |
73b6ecdb | 43 | |
8e9bc36d | 44 | /* USB external connector */ |
11eecf91 CC |
45 | [EXTCON_USB] = "USB", |
46 | [EXTCON_USB_HOST] = "USB-HOST", | |
8e9bc36d | 47 | |
11eecf91 CC |
48 | /* Charging external connector */ |
49 | [EXTCON_CHG_USB_SDP] = "SDP", | |
50 | [EXTCON_CHG_USB_DCP] = "DCP", | |
51 | [EXTCON_CHG_USB_CDP] = "CDP", | |
52 | [EXTCON_CHG_USB_ACA] = "ACA", | |
53 | [EXTCON_CHG_USB_FAST] = "FAST-CHARGER", | |
54 | [EXTCON_CHG_USB_SLOW] = "SLOW-CHARGER", | |
8e9bc36d | 55 | |
11eecf91 CC |
56 | /* Jack external connector */ |
57 | [EXTCON_JACK_MICROPHONE] = "MICROPHONE", | |
58 | [EXTCON_JACK_HEADPHONE] = "HEADPHONE", | |
59 | [EXTCON_JACK_LINE_IN] = "LINE-IN", | |
60 | [EXTCON_JACK_LINE_OUT] = "LINE-OUT", | |
61 | [EXTCON_JACK_VIDEO_IN] = "VIDEO-IN", | |
62 | [EXTCON_JACK_VIDEO_OUT] = "VIDEO-OUT", | |
63 | [EXTCON_JACK_SPDIF_IN] = "SPDIF-IN", | |
64 | [EXTCON_JACK_SPDIF_OUT] = "SPDIF-OUT", | |
8e9bc36d | 65 | |
11eecf91 CC |
66 | /* Display external connector */ |
67 | [EXTCON_DISP_HDMI] = "HDMI", | |
68 | [EXTCON_DISP_MHL] = "MHL", | |
69 | [EXTCON_DISP_DVI] = "DVI", | |
70 | [EXTCON_DISP_VGA] = "VGA", | |
8e9bc36d | 71 | |
11eecf91 CC |
72 | /* Miscellaneous external connector */ |
73 | [EXTCON_DOCK] = "DOCK", | |
74 | [EXTCON_JIG] = "JIG", | |
75 | [EXTCON_MECHANICAL] = "MECHANICAL", | |
8e9bc36d | 76 | |
2a9de9c0 | 77 | NULL, |
806d9dd7 MH |
78 | }; |
79 | ||
20f7b53d CC |
80 | /** |
81 | * struct extcon_cable - An internal data for each cable of extcon device. | |
82 | * @edev: The extcon device | |
83 | * @cable_index: Index of this cable in the edev | |
84 | * @attr_g: Attribute group for the cable | |
85 | * @attr_name: "name" sysfs entry | |
86 | * @attr_state: "state" sysfs entry | |
87 | * @attrs: Array pointing to attr_name and attr_state for attr_g | |
88 | */ | |
89 | struct extcon_cable { | |
90 | struct extcon_dev *edev; | |
91 | int cable_index; | |
92 | ||
93 | struct attribute_group attr_g; | |
94 | struct device_attribute attr_name; | |
95 | struct device_attribute attr_state; | |
96 | ||
97 | struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ | |
98 | }; | |
99 | ||
be3a07f7 | 100 | static struct class *extcon_class; |
449a2bf5 | 101 | #if defined(CONFIG_ANDROID) |
de55d871 | 102 | static struct class_compat *switch_class; |
449a2bf5 | 103 | #endif /* CONFIG_ANDROID */ |
de55d871 | 104 | |
74c5d09b DK |
105 | static LIST_HEAD(extcon_dev_list); |
106 | static DEFINE_MUTEX(extcon_dev_list_lock); | |
107 | ||
bde68e60 MH |
108 | /** |
109 | * check_mutually_exclusive - Check if new_state violates mutually_exclusive | |
a75e1c73 | 110 | * condition. |
bde68e60 MH |
111 | * @edev: the extcon device |
112 | * @new_state: new cable attach status for @edev | |
113 | * | |
114 | * Returns 0 if nothing violates. Returns the index + 1 for the first | |
115 | * violated condition. | |
116 | */ | |
117 | static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) | |
118 | { | |
119 | int i = 0; | |
120 | ||
121 | if (!edev->mutually_exclusive) | |
122 | return 0; | |
123 | ||
124 | for (i = 0; edev->mutually_exclusive[i]; i++) { | |
28c0ada6 | 125 | int weight; |
bde68e60 | 126 | u32 correspondants = new_state & edev->mutually_exclusive[i]; |
bde68e60 | 127 | |
28c0ada6 | 128 | /* calculate the total number of bits set */ |
129 | weight = hweight32(correspondants); | |
130 | if (weight > 1) | |
131 | return i + 1; | |
bde68e60 MH |
132 | } |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
73b6ecdb | 137 | static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
2a9de9c0 CC |
138 | { |
139 | int i; | |
140 | ||
141 | /* Find the the index of extcon cable in edev->supported_cable */ | |
142 | for (i = 0; i < edev->max_supported; i++) { | |
143 | if (edev->supported_cable[i] == id) | |
144 | return i; | |
145 | } | |
146 | ||
147 | return -EINVAL; | |
148 | } | |
149 | ||
046050f6 CC |
150 | static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached) |
151 | { | |
152 | if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) { | |
f4513b06 | 153 | *attached = ((new >> idx) & 0x1) ? true : false; |
046050f6 CC |
154 | return true; |
155 | } | |
156 | ||
157 | return false; | |
158 | } | |
159 | ||
de55d871 MH |
160 | static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
161 | char *buf) | |
162 | { | |
806d9dd7 | 163 | int i, count = 0; |
cb8bb3a7 | 164 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 165 | |
806d9dd7 MH |
166 | if (edev->max_supported == 0) |
167 | return sprintf(buf, "%u\n", edev->state); | |
168 | ||
2a9de9c0 | 169 | for (i = 0; i < edev->max_supported; i++) { |
806d9dd7 | 170 | count += sprintf(buf + count, "%s=%d\n", |
2a9de9c0 | 171 | extcon_name[edev->supported_cable[i]], |
806d9dd7 MH |
172 | !!(edev->state & (1 << i))); |
173 | } | |
174 | ||
175 | return count; | |
176 | } | |
177 | ||
806d9dd7 MH |
178 | static ssize_t state_store(struct device *dev, struct device_attribute *attr, |
179 | const char *buf, size_t count) | |
180 | { | |
181 | u32 state; | |
182 | ssize_t ret = 0; | |
cb8bb3a7 | 183 | struct extcon_dev *edev = dev_get_drvdata(dev); |
806d9dd7 MH |
184 | |
185 | ret = sscanf(buf, "0x%x", &state); | |
186 | if (ret == 0) | |
187 | ret = -EINVAL; | |
188 | else | |
bde68e60 | 189 | ret = extcon_set_state(edev, state); |
806d9dd7 MH |
190 | |
191 | if (ret < 0) | |
192 | return ret; | |
193 | ||
194 | return count; | |
de55d871 | 195 | } |
af01da0e | 196 | static DEVICE_ATTR_RW(state); |
de55d871 MH |
197 | |
198 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
199 | char *buf) | |
200 | { | |
cb8bb3a7 | 201 | struct extcon_dev *edev = dev_get_drvdata(dev); |
de55d871 | 202 | |
71c3ffa5 | 203 | return sprintf(buf, "%s\n", edev->name); |
de55d871 | 204 | } |
af01da0e | 205 | static DEVICE_ATTR_RO(name); |
de55d871 | 206 | |
806d9dd7 MH |
207 | static ssize_t cable_name_show(struct device *dev, |
208 | struct device_attribute *attr, char *buf) | |
209 | { | |
210 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
211 | attr_name); | |
2a9de9c0 | 212 | int i = cable->cable_index; |
806d9dd7 MH |
213 | |
214 | return sprintf(buf, "%s\n", | |
2a9de9c0 | 215 | extcon_name[cable->edev->supported_cable[i]]); |
806d9dd7 MH |
216 | } |
217 | ||
218 | static ssize_t cable_state_show(struct device *dev, | |
219 | struct device_attribute *attr, char *buf) | |
220 | { | |
221 | struct extcon_cable *cable = container_of(attr, struct extcon_cable, | |
222 | attr_state); | |
223 | ||
be052cc8 RQ |
224 | int i = cable->cable_index; |
225 | ||
806d9dd7 MH |
226 | return sprintf(buf, "%d\n", |
227 | extcon_get_cable_state_(cable->edev, | |
be052cc8 | 228 | cable->edev->supported_cable[i])); |
806d9dd7 MH |
229 | } |
230 | ||
de55d871 | 231 | /** |
806d9dd7 | 232 | * extcon_update_state() - Update the cable attach states of the extcon device |
a75e1c73 | 233 | * only for the masked bits. |
de55d871 | 234 | * @edev: the extcon device |
806d9dd7 | 235 | * @mask: the bit mask to designate updated bits. |
de55d871 MH |
236 | * @state: new cable attach status for @edev |
237 | * | |
238 | * Changing the state sends uevent with environment variable containing | |
239 | * the name of extcon device (envp[0]) and the state output (envp[1]). | |
240 | * Tizen uses this format for extcon device to get events from ports. | |
241 | * Android uses this format as well. | |
74c5d09b | 242 | * |
806d9dd7 MH |
243 | * Note that the notifier provides which bits are changed in the state |
244 | * variable with the val parameter (second) to the callback. | |
de55d871 | 245 | */ |
bde68e60 | 246 | int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) |
de55d871 MH |
247 | { |
248 | char name_buf[120]; | |
249 | char state_buf[120]; | |
250 | char *prop_buf; | |
251 | char *envp[3]; | |
252 | int env_offset = 0; | |
253 | int length; | |
046050f6 | 254 | int index; |
806d9dd7 | 255 | unsigned long flags; |
046050f6 | 256 | bool attached; |
de55d871 | 257 | |
7eae43ae CC |
258 | if (!edev) |
259 | return -EINVAL; | |
260 | ||
806d9dd7 | 261 | spin_lock_irqsave(&edev->lock, flags); |
de55d871 | 262 | |
806d9dd7 | 263 | if (edev->state != ((edev->state & ~mask) | (state & mask))) { |
f7a89811 RQ |
264 | u32 old_state; |
265 | ||
bde68e60 MH |
266 | if (check_mutually_exclusive(edev, (edev->state & ~mask) | |
267 | (state & mask))) { | |
268 | spin_unlock_irqrestore(&edev->lock, flags); | |
269 | return -EPERM; | |
270 | } | |
271 | ||
f7a89811 | 272 | old_state = edev->state; |
806d9dd7 MH |
273 | edev->state &= ~mask; |
274 | edev->state |= state & mask; | |
275 | ||
f7a89811 RQ |
276 | for (index = 0; index < edev->max_supported; index++) { |
277 | if (is_extcon_changed(old_state, edev->state, index, | |
278 | &attached)) | |
279 | raw_notifier_call_chain(&edev->nh[index], | |
280 | attached, edev); | |
281 | } | |
282 | ||
806d9dd7 MH |
283 | /* This could be in interrupt handler */ |
284 | prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); | |
de55d871 | 285 | if (prop_buf) { |
dae61651 | 286 | length = name_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
287 | if (length > 0) { |
288 | if (prop_buf[length - 1] == '\n') | |
289 | prop_buf[length - 1] = 0; | |
290 | snprintf(name_buf, sizeof(name_buf), | |
291 | "NAME=%s", prop_buf); | |
292 | envp[env_offset++] = name_buf; | |
293 | } | |
dae61651 | 294 | length = state_show(&edev->dev, NULL, prop_buf); |
de55d871 MH |
295 | if (length > 0) { |
296 | if (prop_buf[length - 1] == '\n') | |
297 | prop_buf[length - 1] = 0; | |
298 | snprintf(state_buf, sizeof(state_buf), | |
299 | "STATE=%s", prop_buf); | |
300 | envp[env_offset++] = state_buf; | |
301 | } | |
302 | envp[env_offset] = NULL; | |
806d9dd7 MH |
303 | /* Unlock early before uevent */ |
304 | spin_unlock_irqrestore(&edev->lock, flags); | |
305 | ||
dae61651 | 306 | kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); |
de55d871 MH |
307 | free_page((unsigned long)prop_buf); |
308 | } else { | |
806d9dd7 MH |
309 | /* Unlock early before uevent */ |
310 | spin_unlock_irqrestore(&edev->lock, flags); | |
311 | ||
dae61651 CC |
312 | dev_err(&edev->dev, "out of memory in extcon_set_state\n"); |
313 | kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); | |
de55d871 | 314 | } |
806d9dd7 MH |
315 | } else { |
316 | /* No changes */ | |
317 | spin_unlock_irqrestore(&edev->lock, flags); | |
de55d871 | 318 | } |
bde68e60 MH |
319 | |
320 | return 0; | |
de55d871 | 321 | } |
806d9dd7 MH |
322 | EXPORT_SYMBOL_GPL(extcon_update_state); |
323 | ||
324 | /** | |
325 | * extcon_set_state() - Set the cable attach states of the extcon device. | |
326 | * @edev: the extcon device | |
327 | * @state: new cable attach status for @edev | |
328 | * | |
329 | * Note that notifier provides which bits are changed in the state | |
330 | * variable with the val parameter (second) to the callback. | |
331 | */ | |
bde68e60 | 332 | int extcon_set_state(struct extcon_dev *edev, u32 state) |
806d9dd7 | 333 | { |
7eae43ae CC |
334 | if (!edev) |
335 | return -EINVAL; | |
336 | ||
bde68e60 | 337 | return extcon_update_state(edev, 0xffffffff, state); |
806d9dd7 | 338 | } |
de55d871 MH |
339 | EXPORT_SYMBOL_GPL(extcon_set_state); |
340 | ||
806d9dd7 | 341 | /** |
2a9de9c0 | 342 | * extcon_get_cable_state_() - Get the status of a specific cable. |
806d9dd7 | 343 | * @edev: the extcon device that has the cable. |
2a9de9c0 | 344 | * @id: the unique id of each external connector in extcon enumeration. |
806d9dd7 | 345 | */ |
73b6ecdb | 346 | int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id) |
806d9dd7 | 347 | { |
2a9de9c0 | 348 | int index; |
806d9dd7 | 349 | |
7eae43ae CC |
350 | if (!edev) |
351 | return -EINVAL; | |
352 | ||
2a9de9c0 CC |
353 | index = find_cable_index_by_id(edev, id); |
354 | if (index < 0) | |
355 | return index; | |
806d9dd7 | 356 | |
2a9de9c0 | 357 | if (edev->max_supported && edev->max_supported <= index) |
806d9dd7 MH |
358 | return -EINVAL; |
359 | ||
360 | return !!(edev->state & (1 << index)); | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(extcon_get_cable_state_); | |
363 | ||
806d9dd7 | 364 | /** |
909f9ec0 | 365 | * extcon_set_cable_state_() - Set the status of a specific cable. |
a75e1c73 | 366 | * @edev: the extcon device that has the cable. |
2a9de9c0 CC |
367 | * @id: the unique id of each external connector |
368 | * in extcon enumeration. | |
369 | * @state: the new cable status. The default semantics is | |
806d9dd7 MH |
370 | * true: attached / false: detached. |
371 | */ | |
73b6ecdb | 372 | int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id, |
2a9de9c0 | 373 | bool cable_state) |
806d9dd7 MH |
374 | { |
375 | u32 state; | |
2a9de9c0 | 376 | int index; |
806d9dd7 | 377 | |
7eae43ae CC |
378 | if (!edev) |
379 | return -EINVAL; | |
380 | ||
2a9de9c0 CC |
381 | index = find_cable_index_by_id(edev, id); |
382 | if (index < 0) | |
383 | return index; | |
384 | ||
385 | if (edev->max_supported && edev->max_supported <= index) | |
806d9dd7 MH |
386 | return -EINVAL; |
387 | ||
388 | state = cable_state ? (1 << index) : 0; | |
bde68e60 | 389 | return extcon_update_state(edev, 1 << index, state); |
806d9dd7 MH |
390 | } |
391 | EXPORT_SYMBOL_GPL(extcon_set_cable_state_); | |
392 | ||
74c5d09b DK |
393 | /** |
394 | * extcon_get_extcon_dev() - Get the extcon device instance from the name | |
395 | * @extcon_name: The extcon name provided with extcon_dev_register() | |
396 | */ | |
397 | struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) | |
398 | { | |
399 | struct extcon_dev *sd; | |
400 | ||
7eae43ae CC |
401 | if (!extcon_name) |
402 | return ERR_PTR(-EINVAL); | |
403 | ||
74c5d09b DK |
404 | mutex_lock(&extcon_dev_list_lock); |
405 | list_for_each_entry(sd, &extcon_dev_list, entry) { | |
406 | if (!strcmp(sd->name, extcon_name)) | |
407 | goto out; | |
408 | } | |
409 | sd = NULL; | |
410 | out: | |
411 | mutex_unlock(&extcon_dev_list_lock); | |
412 | return sd; | |
413 | } | |
414 | EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); | |
415 | ||
416 | /** | |
c338bb03 | 417 | * extcon_register_notifier() - Register a notifiee to get notified by |
a75e1c73 | 418 | * any attach status changes from the extcon. |
046050f6 CC |
419 | * @edev: the extcon device that has the external connecotr. |
420 | * @id: the unique id of each external connector in extcon enumeration. | |
74c5d09b | 421 | * @nb: a notifier block to be registered. |
806d9dd7 MH |
422 | * |
423 | * Note that the second parameter given to the callback of nb (val) is | |
424 | * "old_state", not the current state. The current state can be retrieved | |
425 | * by looking at the third pameter (edev pointer)'s state value. | |
74c5d09b | 426 | */ |
73b6ecdb | 427 | int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 428 | struct notifier_block *nb) |
74c5d09b | 429 | { |
66bee35f | 430 | unsigned long flags; |
046050f6 CC |
431 | int ret, idx; |
432 | ||
830ae442 | 433 | if (!nb) |
7eae43ae CC |
434 | return -EINVAL; |
435 | ||
830ae442 CC |
436 | if (edev) { |
437 | idx = find_cable_index_by_id(edev, id); | |
a05f44c8 SB |
438 | if (idx < 0) |
439 | return idx; | |
66bee35f | 440 | |
830ae442 CC |
441 | spin_lock_irqsave(&edev->lock, flags); |
442 | ret = raw_notifier_chain_register(&edev->nh[idx], nb); | |
443 | spin_unlock_irqrestore(&edev->lock, flags); | |
444 | } else { | |
445 | struct extcon_dev *extd; | |
446 | ||
447 | mutex_lock(&extcon_dev_list_lock); | |
448 | list_for_each_entry(extd, &extcon_dev_list, entry) { | |
449 | idx = find_cable_index_by_id(extd, id); | |
450 | if (idx >= 0) | |
451 | break; | |
452 | } | |
453 | mutex_unlock(&extcon_dev_list_lock); | |
454 | ||
455 | if (idx >= 0) { | |
456 | edev = extd; | |
457 | return extcon_register_notifier(extd, id, nb); | |
458 | } else { | |
459 | ret = -ENODEV; | |
460 | } | |
461 | } | |
66bee35f HG |
462 | |
463 | return ret; | |
74c5d09b DK |
464 | } |
465 | EXPORT_SYMBOL_GPL(extcon_register_notifier); | |
466 | ||
467 | /** | |
c338bb03 | 468 | * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. |
046050f6 CC |
469 | * @edev: the extcon device that has the external connecotr. |
470 | * @id: the unique id of each external connector in extcon enumeration. | |
471 | * @nb: a notifier block to be registered. | |
74c5d09b | 472 | */ |
73b6ecdb | 473 | int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
046050f6 | 474 | struct notifier_block *nb) |
74c5d09b | 475 | { |
66bee35f | 476 | unsigned long flags; |
046050f6 CC |
477 | int ret, idx; |
478 | ||
7eae43ae CC |
479 | if (!edev || !nb) |
480 | return -EINVAL; | |
481 | ||
046050f6 | 482 | idx = find_cable_index_by_id(edev, id); |
a05f44c8 SB |
483 | if (idx < 0) |
484 | return idx; | |
66bee35f HG |
485 | |
486 | spin_lock_irqsave(&edev->lock, flags); | |
046050f6 | 487 | ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
66bee35f HG |
488 | spin_unlock_irqrestore(&edev->lock, flags); |
489 | ||
490 | return ret; | |
74c5d09b DK |
491 | } |
492 | EXPORT_SYMBOL_GPL(extcon_unregister_notifier); | |
493 | ||
af01da0e GKH |
494 | static struct attribute *extcon_attrs[] = { |
495 | &dev_attr_state.attr, | |
496 | &dev_attr_name.attr, | |
497 | NULL, | |
de55d871 | 498 | }; |
af01da0e | 499 | ATTRIBUTE_GROUPS(extcon); |
de55d871 MH |
500 | |
501 | static int create_extcon_class(void) | |
502 | { | |
503 | if (!extcon_class) { | |
504 | extcon_class = class_create(THIS_MODULE, "extcon"); | |
505 | if (IS_ERR(extcon_class)) | |
506 | return PTR_ERR(extcon_class); | |
af01da0e | 507 | extcon_class->dev_groups = extcon_groups; |
de55d871 | 508 | |
449a2bf5 | 509 | #if defined(CONFIG_ANDROID) |
de55d871 MH |
510 | switch_class = class_compat_register("switch"); |
511 | if (WARN(!switch_class, "cannot allocate")) | |
512 | return -ENOMEM; | |
449a2bf5 | 513 | #endif /* CONFIG_ANDROID */ |
de55d871 MH |
514 | } |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
de55d871 MH |
519 | static void extcon_dev_release(struct device *dev) |
520 | { | |
de55d871 MH |
521 | } |
522 | ||
bde68e60 | 523 | static const char *muex_name = "mutually_exclusive"; |
806d9dd7 MH |
524 | static void dummy_sysfs_dev_release(struct device *dev) |
525 | { | |
526 | } | |
527 | ||
a9af6522 CC |
528 | /* |
529 | * extcon_dev_allocate() - Allocate the memory of extcon device. | |
2a9de9c0 | 530 | * @supported_cable: Array of supported extcon ending with EXTCON_NONE. |
a9af6522 CC |
531 | * If supported_cable is NULL, cable name related APIs |
532 | * are disabled. | |
533 | * | |
534 | * This function allocates the memory for extcon device without allocating | |
535 | * memory in each extcon provider driver and initialize default setting for | |
536 | * extcon device. | |
537 | * | |
538 | * Return the pointer of extcon device if success or ERR_PTR(err) if fail | |
539 | */ | |
73b6ecdb | 540 | struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
a9af6522 CC |
541 | { |
542 | struct extcon_dev *edev; | |
543 | ||
7eae43ae CC |
544 | if (!supported_cable) |
545 | return ERR_PTR(-EINVAL); | |
546 | ||
a9af6522 CC |
547 | edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
548 | if (!edev) | |
549 | return ERR_PTR(-ENOMEM); | |
550 | ||
551 | edev->max_supported = 0; | |
552 | edev->supported_cable = supported_cable; | |
553 | ||
554 | return edev; | |
555 | } | |
556 | ||
557 | /* | |
558 | * extcon_dev_free() - Free the memory of extcon device. | |
559 | * @edev: the extcon device to free | |
560 | */ | |
561 | void extcon_dev_free(struct extcon_dev *edev) | |
562 | { | |
563 | kfree(edev); | |
564 | } | |
565 | EXPORT_SYMBOL_GPL(extcon_dev_free); | |
566 | ||
de55d871 MH |
567 | /** |
568 | * extcon_dev_register() - Register a new extcon device | |
569 | * @edev : the new extcon device (should be allocated before calling) | |
de55d871 MH |
570 | * |
571 | * Among the members of edev struct, please set the "user initializing data" | |
572 | * in any case and set the "optional callbacks" if required. However, please | |
573 | * do not set the values of "internal data", which are initialized by | |
574 | * this function. | |
575 | */ | |
42d7d753 | 576 | int extcon_dev_register(struct extcon_dev *edev) |
de55d871 | 577 | { |
806d9dd7 | 578 | int ret, index = 0; |
71c3ffa5 | 579 | static atomic_t edev_no = ATOMIC_INIT(-1); |
de55d871 MH |
580 | |
581 | if (!extcon_class) { | |
582 | ret = create_extcon_class(); | |
583 | if (ret < 0) | |
584 | return ret; | |
585 | } | |
586 | ||
7eae43ae | 587 | if (!edev || !edev->supported_cable) |
2a9de9c0 CC |
588 | return -EINVAL; |
589 | ||
590 | for (; edev->supported_cable[index] != EXTCON_NONE; index++); | |
806d9dd7 | 591 | |
2a9de9c0 | 592 | edev->max_supported = index; |
806d9dd7 | 593 | if (index > SUPPORTED_CABLE_MAX) { |
2a9de9c0 CC |
594 | dev_err(&edev->dev, |
595 | "exceed the maximum number of supported cables\n"); | |
806d9dd7 MH |
596 | return -EINVAL; |
597 | } | |
598 | ||
dae61651 CC |
599 | edev->dev.class = extcon_class; |
600 | edev->dev.release = extcon_dev_release; | |
de55d871 | 601 | |
71c3ffa5 | 602 | edev->name = dev_name(edev->dev.parent); |
42d7d753 CC |
603 | if (IS_ERR_OR_NULL(edev->name)) { |
604 | dev_err(&edev->dev, | |
605 | "extcon device name is null\n"); | |
606 | return -EINVAL; | |
607 | } | |
71c3ffa5 CC |
608 | dev_set_name(&edev->dev, "extcon%lu", |
609 | (unsigned long)atomic_inc_return(&edev_no)); | |
806d9dd7 MH |
610 | |
611 | if (edev->max_supported) { | |
612 | char buf[10]; | |
613 | char *str; | |
614 | struct extcon_cable *cable; | |
615 | ||
616 | edev->cables = kzalloc(sizeof(struct extcon_cable) * | |
617 | edev->max_supported, GFP_KERNEL); | |
618 | if (!edev->cables) { | |
619 | ret = -ENOMEM; | |
620 | goto err_sysfs_alloc; | |
621 | } | |
622 | for (index = 0; index < edev->max_supported; index++) { | |
623 | cable = &edev->cables[index]; | |
624 | ||
625 | snprintf(buf, 10, "cable.%d", index); | |
626 | str = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
627 | GFP_KERNEL); | |
628 | if (!str) { | |
629 | for (index--; index >= 0; index--) { | |
630 | cable = &edev->cables[index]; | |
631 | kfree(cable->attr_g.name); | |
632 | } | |
633 | ret = -ENOMEM; | |
634 | ||
635 | goto err_alloc_cables; | |
636 | } | |
637 | strcpy(str, buf); | |
638 | ||
639 | cable->edev = edev; | |
640 | cable->cable_index = index; | |
641 | cable->attrs[0] = &cable->attr_name.attr; | |
642 | cable->attrs[1] = &cable->attr_state.attr; | |
643 | cable->attrs[2] = NULL; | |
644 | cable->attr_g.name = str; | |
645 | cable->attr_g.attrs = cable->attrs; | |
646 | ||
9baf3220 | 647 | sysfs_attr_init(&cable->attr_name.attr); |
806d9dd7 MH |
648 | cable->attr_name.attr.name = "name"; |
649 | cable->attr_name.attr.mode = 0444; | |
650 | cable->attr_name.show = cable_name_show; | |
651 | ||
9baf3220 | 652 | sysfs_attr_init(&cable->attr_state.attr); |
806d9dd7 | 653 | cable->attr_state.attr.name = "state"; |
ea9dd9d6 | 654 | cable->attr_state.attr.mode = 0444; |
806d9dd7 | 655 | cable->attr_state.show = cable_state_show; |
806d9dd7 MH |
656 | } |
657 | } | |
658 | ||
bde68e60 MH |
659 | if (edev->max_supported && edev->mutually_exclusive) { |
660 | char buf[80]; | |
661 | char *name; | |
662 | ||
663 | /* Count the size of mutually_exclusive array */ | |
664 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
665 | ; | |
666 | ||
667 | edev->attrs_muex = kzalloc(sizeof(struct attribute *) * | |
668 | (index + 1), GFP_KERNEL); | |
669 | if (!edev->attrs_muex) { | |
670 | ret = -ENOMEM; | |
671 | goto err_muex; | |
672 | } | |
673 | ||
674 | edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * | |
675 | index, GFP_KERNEL); | |
676 | if (!edev->d_attrs_muex) { | |
677 | ret = -ENOMEM; | |
678 | kfree(edev->attrs_muex); | |
679 | goto err_muex; | |
680 | } | |
681 | ||
682 | for (index = 0; edev->mutually_exclusive[index]; index++) { | |
683 | sprintf(buf, "0x%x", edev->mutually_exclusive[index]); | |
684 | name = kzalloc(sizeof(char) * (strlen(buf) + 1), | |
685 | GFP_KERNEL); | |
686 | if (!name) { | |
687 | for (index--; index >= 0; index--) { | |
688 | kfree(edev->d_attrs_muex[index].attr. | |
689 | name); | |
690 | } | |
691 | kfree(edev->d_attrs_muex); | |
692 | kfree(edev->attrs_muex); | |
693 | ret = -ENOMEM; | |
694 | goto err_muex; | |
695 | } | |
696 | strcpy(name, buf); | |
9baf3220 | 697 | sysfs_attr_init(&edev->d_attrs_muex[index].attr); |
bde68e60 MH |
698 | edev->d_attrs_muex[index].attr.name = name; |
699 | edev->d_attrs_muex[index].attr.mode = 0000; | |
700 | edev->attrs_muex[index] = &edev->d_attrs_muex[index] | |
701 | .attr; | |
702 | } | |
703 | edev->attr_g_muex.name = muex_name; | |
704 | edev->attr_g_muex.attrs = edev->attrs_muex; | |
705 | ||
706 | } | |
707 | ||
806d9dd7 MH |
708 | if (edev->max_supported) { |
709 | edev->extcon_dev_type.groups = | |
710 | kzalloc(sizeof(struct attribute_group *) * | |
bde68e60 | 711 | (edev->max_supported + 2), GFP_KERNEL); |
806d9dd7 MH |
712 | if (!edev->extcon_dev_type.groups) { |
713 | ret = -ENOMEM; | |
714 | goto err_alloc_groups; | |
715 | } | |
716 | ||
dae61651 | 717 | edev->extcon_dev_type.name = dev_name(&edev->dev); |
806d9dd7 MH |
718 | edev->extcon_dev_type.release = dummy_sysfs_dev_release; |
719 | ||
720 | for (index = 0; index < edev->max_supported; index++) | |
721 | edev->extcon_dev_type.groups[index] = | |
722 | &edev->cables[index].attr_g; | |
bde68e60 MH |
723 | if (edev->mutually_exclusive) |
724 | edev->extcon_dev_type.groups[index] = | |
725 | &edev->attr_g_muex; | |
806d9dd7 | 726 | |
dae61651 | 727 | edev->dev.type = &edev->extcon_dev_type; |
806d9dd7 MH |
728 | } |
729 | ||
dae61651 | 730 | ret = device_register(&edev->dev); |
de55d871 | 731 | if (ret) { |
dae61651 | 732 | put_device(&edev->dev); |
de55d871 MH |
733 | goto err_dev; |
734 | } | |
449a2bf5 | 735 | #if defined(CONFIG_ANDROID) |
de55d871 | 736 | if (switch_class) |
dae61651 | 737 | ret = class_compat_create_link(switch_class, &edev->dev, NULL); |
449a2bf5 | 738 | #endif /* CONFIG_ANDROID */ |
de55d871 | 739 | |
806d9dd7 MH |
740 | spin_lock_init(&edev->lock); |
741 | ||
046050f6 CC |
742 | edev->nh = devm_kzalloc(&edev->dev, |
743 | sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL); | |
744 | if (!edev->nh) { | |
745 | ret = -ENOMEM; | |
746 | goto err_dev; | |
747 | } | |
748 | ||
749 | for (index = 0; index < edev->max_supported; index++) | |
750 | RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); | |
74c5d09b | 751 | |
dae61651 | 752 | dev_set_drvdata(&edev->dev, edev); |
de55d871 | 753 | edev->state = 0; |
74c5d09b DK |
754 | |
755 | mutex_lock(&extcon_dev_list_lock); | |
756 | list_add(&edev->entry, &extcon_dev_list); | |
757 | mutex_unlock(&extcon_dev_list_lock); | |
758 | ||
de55d871 MH |
759 | return 0; |
760 | ||
761 | err_dev: | |
806d9dd7 MH |
762 | if (edev->max_supported) |
763 | kfree(edev->extcon_dev_type.groups); | |
764 | err_alloc_groups: | |
bde68e60 MH |
765 | if (edev->max_supported && edev->mutually_exclusive) { |
766 | for (index = 0; edev->mutually_exclusive[index]; index++) | |
767 | kfree(edev->d_attrs_muex[index].attr.name); | |
768 | kfree(edev->d_attrs_muex); | |
769 | kfree(edev->attrs_muex); | |
770 | } | |
771 | err_muex: | |
806d9dd7 MH |
772 | for (index = 0; index < edev->max_supported; index++) |
773 | kfree(edev->cables[index].attr_g.name); | |
774 | err_alloc_cables: | |
775 | if (edev->max_supported) | |
776 | kfree(edev->cables); | |
777 | err_sysfs_alloc: | |
de55d871 MH |
778 | return ret; |
779 | } | |
780 | EXPORT_SYMBOL_GPL(extcon_dev_register); | |
781 | ||
782 | /** | |
783 | * extcon_dev_unregister() - Unregister the extcon device. | |
c338bb03 | 784 | * @edev: the extcon device instance to be unregistered. |
de55d871 MH |
785 | * |
786 | * Note that this does not call kfree(edev) because edev was not allocated | |
787 | * by this class. | |
788 | */ | |
789 | void extcon_dev_unregister(struct extcon_dev *edev) | |
790 | { | |
57e7cd37 | 791 | int index; |
792 | ||
7eae43ae CC |
793 | if (!edev) |
794 | return; | |
795 | ||
57e7cd37 | 796 | mutex_lock(&extcon_dev_list_lock); |
797 | list_del(&edev->entry); | |
798 | mutex_unlock(&extcon_dev_list_lock); | |
799 | ||
dae61651 CC |
800 | if (IS_ERR_OR_NULL(get_device(&edev->dev))) { |
801 | dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", | |
802 | dev_name(&edev->dev)); | |
57e7cd37 | 803 | return; |
804 | } | |
805 | ||
7585ca0d WX |
806 | device_unregister(&edev->dev); |
807 | ||
57e7cd37 | 808 | if (edev->mutually_exclusive && edev->max_supported) { |
809 | for (index = 0; edev->mutually_exclusive[index]; | |
810 | index++) | |
811 | kfree(edev->d_attrs_muex[index].attr.name); | |
812 | kfree(edev->d_attrs_muex); | |
813 | kfree(edev->attrs_muex); | |
814 | } | |
815 | ||
816 | for (index = 0; index < edev->max_supported; index++) | |
817 | kfree(edev->cables[index].attr_g.name); | |
818 | ||
819 | if (edev->max_supported) { | |
820 | kfree(edev->extcon_dev_type.groups); | |
821 | kfree(edev->cables); | |
822 | } | |
823 | ||
824 | #if defined(CONFIG_ANDROID) | |
825 | if (switch_class) | |
dae61651 | 826 | class_compat_remove_link(switch_class, &edev->dev, NULL); |
57e7cd37 | 827 | #endif |
dae61651 | 828 | put_device(&edev->dev); |
de55d871 MH |
829 | } |
830 | EXPORT_SYMBOL_GPL(extcon_dev_unregister); | |
831 | ||
1ad94ffe CC |
832 | #ifdef CONFIG_OF |
833 | /* | |
834 | * extcon_get_edev_by_phandle - Get the extcon device from devicetree | |
835 | * @dev - instance to the given device | |
836 | * @index - index into list of extcon_dev | |
837 | * | |
838 | * return the instance of extcon device | |
839 | */ | |
840 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
841 | { | |
842 | struct device_node *node; | |
843 | struct extcon_dev *edev; | |
844 | ||
7eae43ae CC |
845 | if (!dev) |
846 | return ERR_PTR(-EINVAL); | |
847 | ||
1ad94ffe CC |
848 | if (!dev->of_node) { |
849 | dev_err(dev, "device does not have a device node entry\n"); | |
850 | return ERR_PTR(-EINVAL); | |
851 | } | |
852 | ||
853 | node = of_parse_phandle(dev->of_node, "extcon", index); | |
854 | if (!node) { | |
855 | dev_err(dev, "failed to get phandle in %s node\n", | |
856 | dev->of_node->full_name); | |
857 | return ERR_PTR(-ENODEV); | |
858 | } | |
859 | ||
f841afb1 TF |
860 | mutex_lock(&extcon_dev_list_lock); |
861 | list_for_each_entry(edev, &extcon_dev_list, entry) { | |
862 | if (edev->dev.parent && edev->dev.parent->of_node == node) { | |
863 | mutex_unlock(&extcon_dev_list_lock); | |
5d5c4c13 | 864 | of_node_put(node); |
f841afb1 TF |
865 | return edev; |
866 | } | |
1ad94ffe | 867 | } |
f841afb1 | 868 | mutex_unlock(&extcon_dev_list_lock); |
5d5c4c13 | 869 | of_node_put(node); |
1ad94ffe | 870 | |
f841afb1 | 871 | return ERR_PTR(-EPROBE_DEFER); |
1ad94ffe CC |
872 | } |
873 | #else | |
874 | struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) | |
875 | { | |
876 | return ERR_PTR(-ENOSYS); | |
877 | } | |
878 | #endif /* CONFIG_OF */ | |
879 | EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); | |
880 | ||
707d7550 CC |
881 | /** |
882 | * extcon_get_edev_name() - Get the name of the extcon device. | |
883 | * @edev: the extcon device | |
884 | */ | |
885 | const char *extcon_get_edev_name(struct extcon_dev *edev) | |
886 | { | |
887 | return !edev ? NULL : edev->name; | |
888 | } | |
889 | ||
de55d871 MH |
890 | static int __init extcon_class_init(void) |
891 | { | |
892 | return create_extcon_class(); | |
893 | } | |
894 | module_init(extcon_class_init); | |
895 | ||
896 | static void __exit extcon_class_exit(void) | |
897 | { | |
0dc77b6d PH |
898 | #if defined(CONFIG_ANDROID) |
899 | class_compat_unregister(switch_class); | |
900 | #endif | |
de55d871 MH |
901 | class_destroy(extcon_class); |
902 | } | |
903 | module_exit(extcon_class_exit); | |
904 | ||
2a9de9c0 | 905 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); |
de55d871 MH |
906 | MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); |
907 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
908 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
909 | MODULE_DESCRIPTION("External connector (extcon) class driver"); | |
910 | MODULE_LICENSE("GPL"); |