2 * External connector (extcon) class driver
4 * Copyright (C) 2015 Samsung Electronics
5 * Author: Chanwoo Choi <cw00.choi@samsung.com>
7 * Copyright (C) 2012 Samsung Electronics
8 * Author: Donggeun Kim <dg77.kim@samsung.com>
9 * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
11 * based on switch class driver
12 * Copyright (C) 2008 Google, Inc.
13 * Author: Mike Lockwood <lockwood@android.com>
15 * This software is licensed under the terms of the GNU General Public
16 * License version 2, as published by the Free Software Foundation, and
17 * may be copied, distributed, and modified under those terms.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
26 #ifndef __LINUX_EXTCON_H__
27 #define __LINUX_EXTCON_H__
29 #include <linux/device.h>
30 #include <linux/notifier.h>
31 #include <linux/sysfs.h>
36 /* USB external connector */
38 EXTCON_USB_HOST = 0x2,
40 /* Charger external connector */
42 EXTCON_FAST_CHARGER = 0x11,
43 EXTCON_SLOW_CHARGER = 0x12,
44 EXTCON_CHARGE_DOWNSTREAM = 0x13,
46 /* Audio/Video external connector */
47 EXTCON_LINE_IN = 0x20,
48 EXTCON_LINE_OUT = 0x21,
49 EXTCON_MICROPHONE = 0x22,
50 EXTCON_HEADPHONE = 0x23,
56 EXTCON_SPDIF_IN = 0x34,
57 EXTCON_SPDIF_OUT = 0x35,
58 EXTCON_VIDEO_IN = 0x36,
59 EXTCON_VIDEO_OUT = 0x37,
61 /* Etc external connector */
64 EXTCON_MECHANICAL = 0x52,
72 * struct extcon_dev - An extcon device represents one external connector.
73 * @name: The name of this extcon device. Parent device name is
75 * @supported_cable: Array of supported cable names ending with EXTCON_NONE.
76 * If supported_cable is NULL, cable name related APIs
78 * @mutually_exclusive: Array of mutually exclusive set of cables that cannot
79 * be attached simultaneously. The array should be
80 * ending with NULL or be NULL (no mutually exclusive
81 * cables). For example, if it is { 0x7, 0x30, 0}, then,
82 * {0, 1}, {0, 1, 2}, {0, 2}, {1, 2}, or {4, 5} cannot
83 * be attached simulataneously. {0x7, 0} is equivalent to
84 * {0x3, 0x6, 0x5, 0}. If it is {0xFFFFFFFF, 0}, there
85 * can be no simultaneous connections.
86 * @print_name: An optional callback to override the method to print the
87 * name of the extcon device.
88 * @print_state: An optional callback to override the method to print the
89 * status of the extcon device.
90 * @dev: Device of this extcon.
91 * @state: Attach/detach state of this extcon. Do not provide at
93 * @nh: Notifier for the state change events from this extcon
94 * @entry: To support list of extcon devices so that users can
95 * search for extcon devices based on the extcon name.
97 * @max_supported: Internal value to store the number of cables.
98 * @extcon_dev_type: Device_type struct to provide attribute_groups
99 * customized for each extcon device.
100 * @cables: Sysfs subdirectories. Each represents one cable.
102 * In most cases, users only need to provide "User initializing data" of
103 * this struct when registering an extcon. In some exceptional cases,
104 * optional callbacks may be needed. However, the values in "internal data"
105 * are overwritten by register function.
108 /* Optional user initializing data */
110 const enum extcon *supported_cable;
111 const u32 *mutually_exclusive;
113 /* Optional callbacks to override class functions */
114 ssize_t (*print_name)(struct extcon_dev *edev, char *buf);
115 ssize_t (*print_state)(struct extcon_dev *edev, char *buf);
117 /* Internal data. Please do not set. */
119 struct raw_notifier_head nh;
120 struct list_head entry;
122 spinlock_t lock; /* could be called by irq handler */
125 /* /sys/class/extcon/.../cable.n/... */
126 struct device_type extcon_dev_type;
127 struct extcon_cable *cables;
129 /* /sys/class/extcon/.../mutually_exclusive/... */
130 struct attribute_group attr_g_muex;
131 struct attribute **attrs_muex;
132 struct device_attribute *d_attrs_muex;
136 * struct extcon_cable - An internal data for each cable of extcon device.
137 * @edev: The extcon device
138 * @cable_index: Index of this cable in the edev
139 * @attr_g: Attribute group for the cable
140 * @attr_name: "name" sysfs entry
141 * @attr_state: "state" sysfs entry
142 * @attrs: Array pointing to attr_name and attr_state for attr_g
144 struct extcon_cable {
145 struct extcon_dev *edev;
148 struct attribute_group attr_g;
149 struct device_attribute attr_name;
150 struct device_attribute attr_state;
152 struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
156 * struct extcon_specific_cable_nb - An internal data for
157 * extcon_register_interest().
158 * @internal_nb: A notifier block bridging extcon notifier
159 * and cable notifier.
160 * @user_nb: user provided notifier block for events from
162 * @cable_index: the target cable.
163 * @edev: the target extcon device.
164 * @previous_value: the saved previous event value.
166 struct extcon_specific_cable_nb {
167 struct notifier_block internal_nb;
168 struct notifier_block *user_nb;
170 struct extcon_dev *edev;
171 unsigned long previous_value;
174 #if IS_ENABLED(CONFIG_EXTCON)
177 * Following APIs are for notifiers or configurations.
178 * Notifiers are the external port and connection devices.
180 extern int extcon_dev_register(struct extcon_dev *edev);
181 extern void extcon_dev_unregister(struct extcon_dev *edev);
182 extern int devm_extcon_dev_register(struct device *dev,
183 struct extcon_dev *edev);
184 extern void devm_extcon_dev_unregister(struct device *dev,
185 struct extcon_dev *edev);
186 extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
189 * Following APIs control the memory of extcon device.
191 extern struct extcon_dev *extcon_dev_allocate(const enum extcon *cable);
192 extern void extcon_dev_free(struct extcon_dev *edev);
193 extern struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
194 const enum extcon *cable);
195 extern void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev);
198 * get/set/update_state access the 32b encoded state value, which represents
199 * states of all possible cables of the multistate port. For example, if one
200 * calls extcon_set_state(edev, 0x7), it may mean that all the three cables
201 * are attached to the port.
203 static inline u32 extcon_get_state(struct extcon_dev *edev)
208 extern int extcon_set_state(struct extcon_dev *edev, u32 state);
209 extern int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state);
212 * get/set_cable_state access each bit of the 32b encoded state value.
213 * They are used to access the status of each cable based on the cable_name.
215 extern int extcon_get_cable_state_(struct extcon_dev *edev, enum extcon id);
216 extern int extcon_set_cable_state_(struct extcon_dev *edev, enum extcon id,
219 extern int extcon_get_cable_state(struct extcon_dev *edev,
220 const char *cable_name);
221 extern int extcon_set_cable_state(struct extcon_dev *edev,
222 const char *cable_name, bool cable_state);
225 * Following APIs are for notifiees (those who want to be notified)
226 * to register a callback for events from a specific cable of the extcon.
227 * Notifiees are the connected device drivers wanting to get notified by
228 * a specific external port of a connection device.
230 extern int extcon_register_interest(struct extcon_specific_cable_nb *obj,
231 const char *extcon_name,
232 const char *cable_name,
233 struct notifier_block *nb);
234 extern int extcon_unregister_interest(struct extcon_specific_cable_nb *nb);
237 * Following APIs are to monitor every action of a notifier.
238 * Registrar gets notified for every external port of a connection device.
239 * Probably this could be used to debug an action of notifier; however,
240 * we do not recommend to use this for normal 'notifiee' device drivers who
241 * want to be notified by a specific external port of the notifier.
243 extern int extcon_register_notifier(struct extcon_dev *edev,
244 struct notifier_block *nb);
245 extern int extcon_unregister_notifier(struct extcon_dev *edev,
246 struct notifier_block *nb);
249 * Following API get the extcon device from devicetree.
250 * This function use phandle of devicetree to get extcon device directly.
252 extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
255 /* Following API to get information of extcon device */
256 extern const char *extcon_get_edev_name(struct extcon_dev *edev);
258 #else /* CONFIG_EXTCON */
259 static inline int extcon_dev_register(struct extcon_dev *edev)
264 static inline void extcon_dev_unregister(struct extcon_dev *edev) { }
266 static inline int devm_extcon_dev_register(struct device *dev,
267 struct extcon_dev *edev)
272 static inline void devm_extcon_dev_unregister(struct device *dev,
273 struct extcon_dev *edev) { }
275 static inline struct extcon_dev *extcon_dev_allocate(const enum extcon *cable)
277 return ERR_PTR(-ENOSYS);
280 static inline void extcon_dev_free(struct extcon_dev *edev) { }
282 static inline struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
283 const enum extcon *cable)
285 return ERR_PTR(-ENOSYS);
288 static inline void devm_extcon_dev_free(struct extcon_dev *edev) { }
290 static inline u32 extcon_get_state(struct extcon_dev *edev)
295 static inline int extcon_set_state(struct extcon_dev *edev, u32 state)
300 static inline int extcon_update_state(struct extcon_dev *edev, u32 mask,
306 static inline int extcon_get_cable_state_(struct extcon_dev *edev,
312 static inline int extcon_set_cable_state_(struct extcon_dev *edev,
313 enum extcon id, bool cable_state)
318 static inline int extcon_get_cable_state(struct extcon_dev *edev,
319 const char *cable_name)
324 static inline int extcon_set_cable_state(struct extcon_dev *edev,
325 const char *cable_name, int state)
330 static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
335 static inline int extcon_register_notifier(struct extcon_dev *edev,
336 struct notifier_block *nb)
341 static inline int extcon_unregister_notifier(struct extcon_dev *edev,
342 struct notifier_block *nb)
347 static inline int extcon_register_interest(struct extcon_specific_cable_nb *obj,
348 const char *extcon_name,
349 const char *cable_name,
350 struct notifier_block *nb)
355 static inline int extcon_unregister_interest(struct extcon_specific_cable_nb
361 static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
364 return ERR_PTR(-ENODEV);
366 #endif /* CONFIG_EXTCON */
367 #endif /* __LINUX_EXTCON_H__ */