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de55d871 MH |
1 | /* |
2 | * External connector (extcon) class driver | |
3 | * | |
4 | * Copyright (C) 2012 Samsung Electronics | |
5 | * Author: Donggeun Kim <dg77.kim@samsung.com> | |
6 | * Author: MyungJoo Ham <myungjoo.ham@samsung.com> | |
7 | * | |
8 | * based on switch class driver | |
9 | * Copyright (C) 2008 Google, Inc. | |
10 | * Author: Mike Lockwood <lockwood@android.com> | |
11 | * | |
12 | * This software is licensed under the terms of the GNU General Public | |
13 | * License version 2, as published by the Free Software Foundation, and | |
14 | * may be copied, distributed, and modified under those terms. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | */ | |
22 | ||
23 | #ifndef __LINUX_EXTCON_H__ | |
24 | #define __LINUX_EXTCON_H__ | |
25 | ||
d851718f | 26 | #include <linux/device.h> |
74c5d09b | 27 | #include <linux/notifier.h> |
d851718f | 28 | #include <linux/sysfs.h> |
806d9dd7 MH |
29 | |
30 | #define SUPPORTED_CABLE_MAX 32 | |
31 | #define CABLE_NAME_MAX 30 | |
32 | ||
33 | /* | |
34 | * The standard cable name is to help support general notifier | |
c338bb03 | 35 | * and notifiee device drivers to share the common names. |
806d9dd7 MH |
36 | * Please use standard cable names unless your notifier device has |
37 | * a very unique and abnormal cable or | |
38 | * the cable type is supposed to be used with only one unique | |
c338bb03 | 39 | * pair of notifier/notifiee devices. |
806d9dd7 MH |
40 | * |
41 | * Please add any other "standard" cables used with extcon dev. | |
42 | * | |
43 | * You may add a dot and number to specify version or specification | |
44 | * of the specific cable if it is required. (e.g., "Fast-charger.18" | |
45 | * and "Fast-charger.10" for 1.8A and 1.0A chargers) | |
c338bb03 PM |
46 | * However, the notifiee and notifier should be able to handle such |
47 | * string and if the notifiee can negotiate the protocol or identify, | |
806d9dd7 MH |
48 | * you don't need such convention. This convention is helpful when |
49 | * notifier can distinguish but notifiee cannot. | |
50 | */ | |
51 | enum extcon_cable_name { | |
52 | EXTCON_USB = 0, | |
53 | EXTCON_USB_HOST, | |
54 | EXTCON_TA, /* Travel Adaptor */ | |
55 | EXTCON_FAST_CHARGER, | |
56 | EXTCON_SLOW_CHARGER, | |
57 | EXTCON_CHARGE_DOWNSTREAM, /* Charging an external device */ | |
58 | EXTCON_HDMI, | |
59 | EXTCON_MHL, | |
60 | EXTCON_DVI, | |
61 | EXTCON_VGA, | |
62 | EXTCON_DOCK, | |
63 | EXTCON_LINE_IN, | |
64 | EXTCON_LINE_OUT, | |
65 | EXTCON_MIC_IN, | |
66 | EXTCON_HEADPHONE_OUT, | |
67 | EXTCON_SPDIF_IN, | |
68 | EXTCON_SPDIF_OUT, | |
69 | EXTCON_VIDEO_IN, | |
70 | EXTCON_VIDEO_OUT, | |
0e1507c8 | 71 | EXTCON_MECHANICAL, |
806d9dd7 | 72 | }; |
0cf6ad8a | 73 | extern const char extcon_cable_name[][CABLE_NAME_MAX + 1]; |
806d9dd7 MH |
74 | |
75 | struct extcon_cable; | |
76 | ||
de55d871 MH |
77 | /** |
78 | * struct extcon_dev - An extcon device represents one external connector. | |
df072eb9 | 79 | * @name: The name of this extcon device. Parent device name is used |
de55d871 | 80 | * if NULL. |
df072eb9 | 81 | * @supported_cable: Array of supported cable names ending with NULL. |
806d9dd7 MH |
82 | * If supported_cable is NULL, cable name related APIs |
83 | * are disabled. | |
df072eb9 | 84 | * @mutually_exclusive: Array of mutually exclusive set of cables that cannot |
bde68e60 MH |
85 | * be attached simultaneously. The array should be |
86 | * ending with NULL or be NULL (no mutually exclusive | |
87 | * cables). For example, if it is { 0x7, 0x30, 0}, then, | |
88 | * {0, 1}, {0, 1, 2}, {0, 2}, {1, 2}, or {4, 5} cannot | |
89 | * be attached simulataneously. {0x7, 0} is equivalent to | |
90 | * {0x3, 0x6, 0x5, 0}. If it is {0xFFFFFFFF, 0}, there | |
91 | * can be no simultaneous connections. | |
df072eb9 | 92 | * @print_name: An optional callback to override the method to print the |
de55d871 | 93 | * name of the extcon device. |
df072eb9 | 94 | * @print_state: An optional callback to override the method to print the |
de55d871 | 95 | * status of the extcon device. |
df072eb9 MH |
96 | * @dev: Device of this extcon. Do not provide at register-time. |
97 | * @state: Attach/detach state of this extcon. Do not provide at | |
de55d871 | 98 | * register-time |
df072eb9 MH |
99 | * @nh: Notifier for the state change events from this extcon |
100 | * @entry: To support list of extcon devices so that users can search | |
74c5d09b | 101 | * for extcon devices based on the extcon name. |
df072eb9 MH |
102 | * @lock: |
103 | * @max_supported: Internal value to store the number of cables. | |
104 | * @extcon_dev_type: Device_type struct to provide attribute_groups | |
806d9dd7 | 105 | * customized for each extcon device. |
df072eb9 | 106 | * @cables: Sysfs subdirectories. Each represents one cable. |
de55d871 MH |
107 | * |
108 | * In most cases, users only need to provide "User initializing data" of | |
109 | * this struct when registering an extcon. In some exceptional cases, | |
110 | * optional callbacks may be needed. However, the values in "internal data" | |
111 | * are overwritten by register function. | |
112 | */ | |
113 | struct extcon_dev { | |
114 | /* --- Optional user initializing data --- */ | |
115 | const char *name; | |
806d9dd7 | 116 | const char **supported_cable; |
bde68e60 | 117 | const u32 *mutually_exclusive; |
de55d871 MH |
118 | |
119 | /* --- Optional callbacks to override class functions --- */ | |
120 | ssize_t (*print_name)(struct extcon_dev *edev, char *buf); | |
121 | ssize_t (*print_state)(struct extcon_dev *edev, char *buf); | |
122 | ||
123 | /* --- Internal data. Please do not set. --- */ | |
124 | struct device *dev; | |
125 | u32 state; | |
74c5d09b DK |
126 | struct raw_notifier_head nh; |
127 | struct list_head entry; | |
806d9dd7 MH |
128 | spinlock_t lock; /* could be called by irq handler */ |
129 | int max_supported; | |
130 | ||
131 | /* /sys/class/extcon/.../cable.n/... */ | |
132 | struct device_type extcon_dev_type; | |
133 | struct extcon_cable *cables; | |
bde68e60 MH |
134 | /* /sys/class/extcon/.../mutually_exclusive/... */ |
135 | struct attribute_group attr_g_muex; | |
136 | struct attribute **attrs_muex; | |
137 | struct device_attribute *d_attrs_muex; | |
806d9dd7 MH |
138 | }; |
139 | ||
140 | /** | |
141 | * struct extcon_cable - An internal data for each cable of extcon device. | |
df072eb9 MH |
142 | * @edev: The extcon device |
143 | * @cable_index: Index of this cable in the edev | |
144 | * @attr_g: Attribute group for the cable | |
145 | * @attr_name: "name" sysfs entry | |
146 | * @attr_state: "state" sysfs entry | |
147 | * @attrs: Array pointing to attr_name and attr_state for attr_g | |
806d9dd7 MH |
148 | */ |
149 | struct extcon_cable { | |
150 | struct extcon_dev *edev; | |
151 | int cable_index; | |
152 | ||
153 | struct attribute_group attr_g; | |
154 | struct device_attribute attr_name; | |
155 | struct device_attribute attr_state; | |
156 | ||
157 | struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ | |
158 | }; | |
159 | ||
160 | /** | |
161 | * struct extcon_specific_cable_nb - An internal data for | |
162 | * extcon_register_interest(). | |
df072eb9 MH |
163 | * @internal_nb: a notifier block bridging extcon notifier and cable notifier. |
164 | * @user_nb: user provided notifier block for events from a specific cable. | |
165 | * @cable_index: the target cable. | |
166 | * @edev: the target extcon device. | |
167 | * @previous_value: the saved previous event value. | |
806d9dd7 MH |
168 | */ |
169 | struct extcon_specific_cable_nb { | |
170 | struct notifier_block internal_nb; | |
171 | struct notifier_block *user_nb; | |
172 | int cable_index; | |
173 | struct extcon_dev *edev; | |
174 | unsigned long previous_value; | |
de55d871 MH |
175 | }; |
176 | ||
177 | #if IS_ENABLED(CONFIG_EXTCON) | |
74c5d09b DK |
178 | |
179 | /* | |
180 | * Following APIs are for notifiers or configurations. | |
181 | * Notifiers are the external port and connection devices. | |
182 | */ | |
de55d871 MH |
183 | extern int extcon_dev_register(struct extcon_dev *edev, struct device *dev); |
184 | extern void extcon_dev_unregister(struct extcon_dev *edev); | |
74c5d09b | 185 | extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name); |
de55d871 | 186 | |
806d9dd7 MH |
187 | /* |
188 | * get/set/update_state access the 32b encoded state value, which represents | |
189 | * states of all possible cables of the multistate port. For example, if one | |
190 | * calls extcon_set_state(edev, 0x7), it may mean that all the three cables | |
191 | * are attached to the port. | |
192 | */ | |
de55d871 MH |
193 | static inline u32 extcon_get_state(struct extcon_dev *edev) |
194 | { | |
195 | return edev->state; | |
196 | } | |
197 | ||
bde68e60 MH |
198 | extern int extcon_set_state(struct extcon_dev *edev, u32 state); |
199 | extern int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state); | |
806d9dd7 MH |
200 | |
201 | /* | |
202 | * get/set_cable_state access each bit of the 32b encoded state value. | |
203 | * They are used to access the status of each cable based on the cable_name | |
c338bb03 | 204 | * or cable_index, which is retrieved by extcon_find_cable_index |
806d9dd7 MH |
205 | */ |
206 | extern int extcon_find_cable_index(struct extcon_dev *sdev, | |
207 | const char *cable_name); | |
208 | extern int extcon_get_cable_state_(struct extcon_dev *edev, int cable_index); | |
209 | extern int extcon_set_cable_state_(struct extcon_dev *edev, int cable_index, | |
210 | bool cable_state); | |
211 | ||
212 | extern int extcon_get_cable_state(struct extcon_dev *edev, | |
213 | const char *cable_name); | |
214 | extern int extcon_set_cable_state(struct extcon_dev *edev, | |
215 | const char *cable_name, bool cable_state); | |
216 | ||
217 | /* | |
218 | * Following APIs are for notifiees (those who want to be notified) | |
219 | * to register a callback for events from a specific cable of the extcon. | |
220 | * Notifiees are the connected device drivers wanting to get notified by | |
221 | * a specific external port of a connection device. | |
222 | */ | |
223 | extern int extcon_register_interest(struct extcon_specific_cable_nb *obj, | |
224 | const char *extcon_name, | |
225 | const char *cable_name, | |
226 | struct notifier_block *nb); | |
227 | extern int extcon_unregister_interest(struct extcon_specific_cable_nb *nb); | |
74c5d09b DK |
228 | |
229 | /* | |
230 | * Following APIs are to monitor every action of a notifier. | |
c338bb03 | 231 | * Registrar gets notified for every external port of a connection device. |
806d9dd7 | 232 | * Probably this could be used to debug an action of notifier; however, |
c338bb03 | 233 | * we do not recommend to use this for normal 'notifiee' device drivers who |
806d9dd7 | 234 | * want to be notified by a specific external port of the notifier. |
74c5d09b DK |
235 | */ |
236 | extern int extcon_register_notifier(struct extcon_dev *edev, | |
237 | struct notifier_block *nb); | |
238 | extern int extcon_unregister_notifier(struct extcon_dev *edev, | |
239 | struct notifier_block *nb); | |
de55d871 MH |
240 | #else /* CONFIG_EXTCON */ |
241 | static inline int extcon_dev_register(struct extcon_dev *edev, | |
242 | struct device *dev) | |
243 | { | |
244 | return 0; | |
245 | } | |
246 | ||
247 | static inline void extcon_dev_unregister(struct extcon_dev *edev) { } | |
248 | ||
249 | static inline u32 extcon_get_state(struct extcon_dev *edev) | |
250 | { | |
251 | return 0; | |
252 | } | |
253 | ||
bde68e60 MH |
254 | static inline int extcon_set_state(struct extcon_dev *edev, u32 state) |
255 | { | |
256 | return 0; | |
257 | } | |
806d9dd7 | 258 | |
bde68e60 | 259 | static inline int extcon_update_state(struct extcon_dev *edev, u32 mask, |
806d9dd7 | 260 | u32 state) |
bde68e60 MH |
261 | { |
262 | return 0; | |
263 | } | |
806d9dd7 MH |
264 | |
265 | static inline int extcon_find_cable_index(struct extcon_dev *edev, | |
266 | const char *cable_name) | |
267 | { | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static inline int extcon_get_cable_state_(struct extcon_dev *edev, | |
272 | int cable_index) | |
273 | { | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static inline int extcon_set_cable_state_(struct extcon_dev *edev, | |
278 | int cable_index, bool cable_state) | |
279 | { | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static inline int extcon_get_cable_state(struct extcon_dev *edev, | |
284 | const char *cable_name) | |
285 | { | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static inline int extcon_set_cable_state(struct extcon_dev *edev, | |
290 | const char *cable_name, int state) | |
291 | { | |
292 | return 0; | |
293 | } | |
294 | ||
74c5d09b DK |
295 | static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) |
296 | { | |
297 | return NULL; | |
298 | } | |
299 | ||
300 | static inline int extcon_register_notifier(struct extcon_dev *edev, | |
301 | struct notifier_block *nb) | |
302 | { | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static inline int extcon_unregister_notifier(struct extcon_dev *edev, | |
307 | struct notifier_block *nb) | |
308 | { | |
309 | return 0; | |
310 | } | |
311 | ||
806d9dd7 MH |
312 | static inline int extcon_register_interest(struct extcon_specific_cable_nb *obj, |
313 | const char *extcon_name, | |
314 | const char *cable_name, | |
315 | struct notifier_block *nb) | |
316 | { | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static inline int extcon_unregister_interest(struct extcon_specific_cable_nb | |
321 | *obj) | |
322 | { | |
323 | return 0; | |
324 | } | |
de55d871 MH |
325 | #endif /* CONFIG_EXTCON */ |
326 | #endif /* __LINUX_EXTCON_H__ */ |