1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * External Connector (extcon) framework
4 * - linux/include/linux/extcon.h for extcon consumer device driver.
5 *
6 * Copyright (C) 2015 Samsung Electronics
7 * Author: Chanwoo Choi <cw00.choi@samsung.com>
8 *
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 switch class driver
14 * Copyright (C) 2008 Google, Inc.
15 * Author: Mike Lockwood <lockwood@android.com>
16 */
17
18 #ifndef __LINUX_EXTCON_H__
19 #define __LINUX_EXTCON_H__
20
21 #include <linux/device.h>
22
23 /*
24 * Define the type of supported external connectors
25 */
26 #define EXTCON_TYPE_USB BIT(0) /* USB connector */
27 #define EXTCON_TYPE_CHG BIT(1) /* Charger connector */
28 #define EXTCON_TYPE_JACK BIT(2) /* Jack connector */
29 #define EXTCON_TYPE_DISP BIT(3) /* Display connector */
30 #define EXTCON_TYPE_MISC BIT(4) /* Miscellaneous connector */
31
32 /*
33 * Define the unique id of supported external connectors
34 */
35 #define EXTCON_NONE 0
36
37 /* USB external connector */
38 #define EXTCON_USB 1
39 #define EXTCON_USB_HOST 2
40
41 /*
42 * Charging external connector
43 *
44 * When one SDP charger connector was reported, we should also report
45 * the USB connector, which means EXTCON_CHG_USB_SDP should always
46 * appear together with EXTCON_USB. The same as ACA charger connector,
47 * EXTCON_CHG_USB_ACA would normally appear with EXTCON_USB_HOST.
48 *
49 * The EXTCON_CHG_USB_SLOW connector can provide at least 500mA of
50 * current at 5V. The EXTCON_CHG_USB_FAST connector can provide at
51 * least 1A of current at 5V.
52 */
53 #define EXTCON_CHG_USB_SDP 5 /* Standard Downstream Port */
54 #define EXTCON_CHG_USB_DCP 6 /* Dedicated Charging Port */
55 #define EXTCON_CHG_USB_CDP 7 /* Charging Downstream Port */
56 #define EXTCON_CHG_USB_ACA 8 /* Accessory Charger Adapter */
57 #define EXTCON_CHG_USB_FAST 9
58 #define EXTCON_CHG_USB_SLOW 10
59 #define EXTCON_CHG_WPT 11 /* Wireless Power Transfer */
60 #define EXTCON_CHG_USB_PD 12 /* USB Power Delivery */
61
62 /* Jack external connector */
63 #define EXTCON_JACK_MICROPHONE 20
64 #define EXTCON_JACK_HEADPHONE 21
65 #define EXTCON_JACK_LINE_IN 22
66 #define EXTCON_JACK_LINE_OUT 23
67 #define EXTCON_JACK_VIDEO_IN 24
68 #define EXTCON_JACK_VIDEO_OUT 25
69 #define EXTCON_JACK_SPDIF_IN 26 /* Sony Philips Digital InterFace */
70 #define EXTCON_JACK_SPDIF_OUT 27
71
72 /* Display external connector */
73 #define EXTCON_DISP_HDMI 40 /* High-Definition Multimedia Interface */
74 #define EXTCON_DISP_MHL 41 /* Mobile High-Definition Link */
75 #define EXTCON_DISP_DVI 42 /* Digital Visual Interface */
76 #define EXTCON_DISP_VGA 43 /* Video Graphics Array */
77 #define EXTCON_DISP_DP 44 /* Display Port */
78 #define EXTCON_DISP_HMD 45 /* Head-Mounted Display */
79 #define EXTCON_DISP_CVBS 46 /* Composite Video Broadcast Signal */
80 #define EXTCON_DISP_EDP 47 /* Embedded Display Port */
81
82 /* Miscellaneous external connector */
83 #define EXTCON_DOCK 60
84 #define EXTCON_JIG 61
85 #define EXTCON_MECHANICAL 62
86
87 #define EXTCON_NUM 63
88
89 /*
90 * Define the properties of supported external connectors.
91 *
92 * When adding the new extcon property, they *must* have
93 * the type/value/default information. Also, you *have to*
94 * modify the EXTCON_PROP_[type]_START/END definitions
95 * which mean the range of the supported properties
96 * for each extcon type.
97 *
98 * The naming style of property
99 * : EXTCON_PROP_[type]_[property name]
100 *
101 * EXTCON_PROP_USB_[property name] : USB property
102 * EXTCON_PROP_CHG_[property name] : Charger property
103 * EXTCON_PROP_JACK_[property name] : Jack property
104 * EXTCON_PROP_DISP_[property name] : Display property
105 */
106
107 /*
108 * Properties of EXTCON_TYPE_USB.
109 *
110 * - EXTCON_PROP_USB_VBUS
111 * @type: integer (intval)
112 * @value: 0 (low) or 1 (high)
113 * @default: 0 (low)
114 * - EXTCON_PROP_USB_TYPEC_POLARITY
115 * @type: integer (intval)
116 * @value: 0 (normal) or 1 (flip)
117 * @default: 0 (normal)
118 * - EXTCON_PROP_USB_SS (SuperSpeed)
119 * @type: integer (intval)
120 * @value: 0 (USB/USB2) or 1 (USB3)
121 * @default: 0 (USB/USB2)
122 *
123 */
124 #define EXTCON_PROP_USB_VBUS 0
125 #define EXTCON_PROP_USB_TYPEC_POLARITY 1
126 #define EXTCON_PROP_USB_SS 2
127
128 #define EXTCON_PROP_USB_MIN 0
129 #define EXTCON_PROP_USB_MAX 2
130 #define EXTCON_PROP_USB_CNT (EXTCON_PROP_USB_MAX - EXTCON_PROP_USB_MIN + 1)
131
132 /* Properties of EXTCON_TYPE_CHG. */
133 #define EXTCON_PROP_CHG_MIN 50
134 #define EXTCON_PROP_CHG_MAX 50
135 #define EXTCON_PROP_CHG_CNT (EXTCON_PROP_CHG_MAX - EXTCON_PROP_CHG_MIN + 1)
136
137 /* Properties of EXTCON_TYPE_JACK. */
138 #define EXTCON_PROP_JACK_MIN 100
139 #define EXTCON_PROP_JACK_MAX 100
140 #define EXTCON_PROP_JACK_CNT (EXTCON_PROP_JACK_MAX - EXTCON_PROP_JACK_MIN + 1)
141
142 /*
143 * Properties of EXTCON_TYPE_DISP.
144 *
145 * - EXTCON_PROP_DISP_HPD (Hot Plug Detect)
146 * @type: integer (intval)
147 * @value: 0 (no hpd) or 1 (hpd)
148 * @default: 0 (no hpd)
149 *
150 */
151 #define EXTCON_PROP_DISP_HPD 150
152
153 /* Properties of EXTCON_TYPE_DISP. */
154 #define EXTCON_PROP_DISP_MIN 150
155 #define EXTCON_PROP_DISP_MAX 151
156 #define EXTCON_PROP_DISP_CNT (EXTCON_PROP_DISP_MAX - EXTCON_PROP_DISP_MIN + 1)
157
158 /*
159 * Define the type of property's value.
160 *
161 * Define the property's value as union type. Because each property
162 * would need the different data type to store it.
163 */
164 union extcon_property_value {
165 int intval; /* type : integer (intval) */
166 };
167
168 struct extcon_dev;
169
170 #if IS_ENABLED(CONFIG_EXTCON)
171 /*
172 * Following APIs get the connected state of each external connector.
173 * The 'id' argument indicates the defined external connector.
174 */
175 int extcon_get_state(struct extcon_dev *edev, unsigned int id);
176
177 /*
178 * Following APIs get the property of each external connector.
179 * The 'id' argument indicates the defined external connector
180 * and the 'prop' indicates the extcon property.
181 *
182 * And extcon_get_property_capability() get the capability of the property
183 * for each external connector. They are used to get the capability of the
184 * property of each external connector based on the id and property.
185 */
186 int extcon_get_property(struct extcon_dev *edev, unsigned int id,
187 unsigned int prop,
188 union extcon_property_value *prop_val);
189 int extcon_get_property_capability(struct extcon_dev *edev,
190 unsigned int id, unsigned int prop);
191
192 /*
193 * Following APIs register the notifier block in order to detect
194 * the change of both state and property value for each external connector.
195 *
196 * extcon_register_notifier(*edev, id, *nb) : Register a notifier block
197 * for specific external connector of the extcon.
198 * extcon_register_notifier_all(*edev, *nb) : Register a notifier block
199 * for all supported external connectors of the extcon.
200 */
201 int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
202 struct notifier_block *nb);
203 int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
204 struct notifier_block *nb);
205 int devm_extcon_register_notifier(struct device *dev,
206 struct extcon_dev *edev, unsigned int id,
207 struct notifier_block *nb);
208 void devm_extcon_unregister_notifier(struct device *dev,
209 struct extcon_dev *edev, unsigned int id,
210 struct notifier_block *nb);
211
212 int extcon_register_notifier_all(struct extcon_dev *edev,
213 struct notifier_block *nb);
214 int extcon_unregister_notifier_all(struct extcon_dev *edev,
215 struct notifier_block *nb);
216 int devm_extcon_register_notifier_all(struct device *dev,
217 struct extcon_dev *edev,
218 struct notifier_block *nb);
219 void devm_extcon_unregister_notifier_all(struct device *dev,
220 struct extcon_dev *edev,
221 struct notifier_block *nb);
222
223 /*
224 * Following APIs get the extcon_dev from devicetree or by through extcon name.
225 */
226 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
227 struct extcon_dev *extcon_find_edev_by_node(struct device_node *node);
228 struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
229 int index);
230
231 /* Following API get the name of extcon device. */
232 const char *extcon_get_edev_name(struct extcon_dev *edev);
233
234 #else /* CONFIG_EXTCON */
235 static inline int extcon_get_state(struct extcon_dev *edev, unsigned int id)
236 {
237 return 0;
238 }
239
240 static inline int extcon_get_property(struct extcon_dev *edev, unsigned int id,
241 unsigned int prop,
242 union extcon_property_value *prop_val)
243 {
244 return 0;
245 }
246
247 static inline int extcon_get_property_capability(struct extcon_dev *edev,
248 unsigned int id, unsigned int prop)
249 {
250 return 0;
251 }
252
253 static inline int extcon_register_notifier(struct extcon_dev *edev,
254 unsigned int id, struct notifier_block *nb)
255 {
256 return 0;
257 }
258
259 static inline int extcon_unregister_notifier(struct extcon_dev *edev,
260 unsigned int id, struct notifier_block *nb)
261 {
262 return 0;
263 }
264
265 static inline int devm_extcon_register_notifier(struct device *dev,
266 struct extcon_dev *edev, unsigned int id,
267 struct notifier_block *nb)
268 {
269 return -ENOSYS;
270 }
271
272 static inline void devm_extcon_unregister_notifier(struct device *dev,
273 struct extcon_dev *edev, unsigned int id,
274 struct notifier_block *nb) { }
275
276 static inline int extcon_register_notifier_all(struct extcon_dev *edev,
277 struct notifier_block *nb)
278 {
279 return 0;
280 }
281
282 static inline int extcon_unregister_notifier_all(struct extcon_dev *edev,
283 struct notifier_block *nb)
284 {
285 return 0;
286 }
287
288 static inline int devm_extcon_register_notifier_all(struct device *dev,
289 struct extcon_dev *edev,
290 struct notifier_block *nb)
291 {
292 return 0;
293 }
294
295 static inline void devm_extcon_unregister_notifier_all(struct device *dev,
296 struct extcon_dev *edev,
297 struct notifier_block *nb) { }
298
299 static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
300 {
301 return NULL;
302 }
303
304 static inline struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
305 {
306 return ERR_PTR(-ENODEV);
307 }
308
309 static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
310 int index)
311 {
312 return ERR_PTR(-ENODEV);
313 }
314
315 static inline const char *extcon_get_edev_name(struct extcon_dev *edev)
316 {
317 return NULL;
318 }
319 #endif /* CONFIG_EXTCON */
320
321 /*
322 * Following structure and API are deprecated. EXTCON remains the function
323 * definition to prevent the build break.
324 */
325 struct extcon_specific_cable_nb {
326 struct notifier_block *user_nb;
327 int cable_index;
328 struct extcon_dev *edev;
329 unsigned long previous_value;
330 };
331 #endif /* __LINUX_EXTCON_H__ */
332
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