include/linux/extcon.h

   1 /*
   2  *  External connector (extcon) class driver
   3  *
   4  * Copyright (C) 2015 Samsung Electronics
   5  * Author: Chanwoo Choi <cw00.choi@samsung.com>
   6  *
   7  * Copyright (C) 2012 Samsung Electronics
   8  * Author: Donggeun Kim <dg77.kim@samsung.com>
   9  * Author: MyungJoo Ham <myungjoo.ham@samsung.com>
  10  *
  11  * based on switch class driver
  12  * Copyright (C) 2008 Google, Inc.
  13  * Author: Mike Lockwood <lockwood@android.com>
  14  *
  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.
  18  *
  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.
  23  *
  24 */
  25
  26 #ifndef __LINUX_EXTCON_H__
  27 #define __LINUX_EXTCON_H__
  28
  29 #include <linux/device.h>
  30
  31 /*
  32  * Define the unique id of supported external connectors
  33  */
  34 #define EXTCON_NONE             0
  35
  36 /* USB external connector */
  37 #define EXTCON_USB              1
  38 #define EXTCON_USB_HOST         2
  39
  40 /* Charging external connector */
  41 #define EXTCON_CHG_USB_SDP      5       /* Standard Downstream Port */
  42 #define EXTCON_CHG_USB_DCP      6       /* Dedicated Charging Port */
  43 #define EXTCON_CHG_USB_CDP      7       /* Charging Downstream Port */
  44 #define EXTCON_CHG_USB_ACA      8       /* Accessory Charger Adapter */
  45 #define EXTCON_CHG_USB_FAST     9
  46 #define EXTCON_CHG_USB_SLOW     10
  47
  48 /* Jack external connector */
  49 #define EXTCON_JACK_MICROPHONE  20
  50 #define EXTCON_JACK_HEADPHONE   21
  51 #define EXTCON_JACK_LINE_IN     22
  52 #define EXTCON_JACK_LINE_OUT    23
  53 #define EXTCON_JACK_VIDEO_IN    24
  54 #define EXTCON_JACK_VIDEO_OUT   25
  55 #define EXTCON_JACK_SPDIF_IN    26      /* Sony Philips Digital InterFace */
  56 #define EXTCON_JACK_SPDIF_OUT   27
  57
  58 /* Display external connector */
  59 #define EXTCON_DISP_HDMI        40      /* High-Definition Multimedia Interface */
  60 #define EXTCON_DISP_MHL         41      /* Mobile High-Definition Link */
  61 #define EXTCON_DISP_DVI         42      /* Digital Visual Interface */
  62 #define EXTCON_DISP_VGA         43      /* Video Graphics Array */
  63
  64 /* Miscellaneous external connector */
  65 #define EXTCON_DOCK             60
  66 #define EXTCON_JIG              61
  67 #define EXTCON_MECHANICAL       62
  68
  69 #define EXTCON_NUM              63
  70
  71 struct extcon_cable;
  72
  73 /**
  74  * struct extcon_dev - An extcon device represents one external connector.
  75  * @name:               The name of this extcon device. Parent device name is
  76  *                      used if NULL.
  77  * @supported_cable:    Array of supported cable names ending with EXTCON_NONE.
  78  *                      If supported_cable is NULL, cable name related APIs
  79  *                      are disabled.
  80  * @mutually_exclusive: Array of mutually exclusive set of cables that cannot
  81  *                      be attached simultaneously. The array should be
  82  *                      ending with NULL or be NULL (no mutually exclusive
  83  *                      cables). For example, if it is { 0x7, 0x30, 0}, then,
  84  *                      {0, 1}, {0, 1, 2}, {0, 2}, {1, 2}, or {4, 5} cannot
  85  *                      be attached simulataneously. {0x7, 0} is equivalent to
  86  *                      {0x3, 0x6, 0x5, 0}. If it is {0xFFFFFFFF, 0}, there
  87  *                      can be no simultaneous connections.
  88  * @dev:                Device of this extcon.
  89  * @state:              Attach/detach state of this extcon. Do not provide at
  90  *                      register-time.
  91  * @nh:                 Notifier for the state change events from this extcon
  92  * @entry:              To support list of extcon devices so that users can
  93  *                      search for extcon devices based on the extcon name.
  94  * @lock:
  95  * @max_supported:      Internal value to store the number of cables.
  96  * @extcon_dev_type:    Device_type struct to provide attribute_groups
  97  *                      customized for each extcon device.
  98  * @cables:             Sysfs subdirectories. Each represents one cable.
  99  *
 100  * In most cases, users only need to provide "User initializing data" of
 101  * this struct when registering an extcon. In some exceptional cases,
 102  * optional callbacks may be needed. However, the values in "internal data"
 103  * are overwritten by register function.
 104  */
 105 struct extcon_dev {
 106         /* Optional user initializing data */
 107         const char *name;
 108         const unsigned int *supported_cable;
 109         const u32 *mutually_exclusive;
 110
 111         /* Internal data. Please do not set. */
 112         struct device dev;
 113         struct raw_notifier_head *nh;
 114         struct list_head entry;
 115         int max_supported;
 116         spinlock_t lock;        /* could be called by irq handler */
 117         u32 state;
 118
 119         /* /sys/class/extcon/.../cable.n/... */
 120         struct device_type extcon_dev_type;
 121         struct extcon_cable *cables;
 122
 123         /* /sys/class/extcon/.../mutually_exclusive/... */
 124         struct attribute_group attr_g_muex;
 125         struct attribute **attrs_muex;
 126         struct device_attribute *d_attrs_muex;
 127 };
 128
 129 #if IS_ENABLED(CONFIG_EXTCON)
 130
 131 /*
 132  * Following APIs are for notifiers or configurations.
 133  * Notifiers are the external port and connection devices.
 134  */
 135 extern int extcon_dev_register(struct extcon_dev *edev);
 136 extern void extcon_dev_unregister(struct extcon_dev *edev);
 137 extern int devm_extcon_dev_register(struct device *dev,
 138                                     struct extcon_dev *edev);
 139 extern void devm_extcon_dev_unregister(struct device *dev,
 140                                        struct extcon_dev *edev);
 141 extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
 142
 143 /*
 144  * Following APIs control the memory of extcon device.
 145  */
 146 extern struct extcon_dev *extcon_dev_allocate(const unsigned int *cable);
 147 extern void extcon_dev_free(struct extcon_dev *edev);
 148 extern struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
 149                                                    const unsigned int *cable);
 150 extern void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev);
 151
 152 /*
 153  * get/set/update_state access the 32b encoded state value, which represents
 154  * states of all possible cables of the multistate port. For example, if one
 155  * calls extcon_set_state(edev, 0x7), it may mean that all the three cables
 156  * are attached to the port.
 157  */
 158 static inline u32 extcon_get_state(struct extcon_dev *edev)
 159 {
 160         return edev->state;
 161 }
 162
 163 extern int extcon_set_state(struct extcon_dev *edev, u32 state);
 164 extern int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state);
 165
 166 /*
 167  * get/set_cable_state access each bit of the 32b encoded state value.
 168  * They are used to access the status of each cable based on the cable id.
 169  */
 170 extern int extcon_get_cable_state_(struct extcon_dev *edev, unsigned int id);
 171 extern int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
 172                                    bool cable_state);
 173
 174 /*
 175  * Following APIs are to monitor every action of a notifier.
 176  * Registrar gets notified for every external port of a connection device.
 177  * Probably this could be used to debug an action of notifier; however,
 178  * we do not recommend to use this for normal 'notifiee' device drivers who
 179  * want to be notified by a specific external port of the notifier.
 180  */
 181 extern int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
 182                                     struct notifier_block *nb);
 183 extern int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
 184                                     struct notifier_block *nb);
 185 extern int devm_extcon_register_notifier(struct device *dev,
 186                                 struct extcon_dev *edev, unsigned int id,
 187                                 struct notifier_block *nb);
 188 extern void devm_extcon_unregister_notifier(struct device *dev,
 189                                 struct extcon_dev *edev, unsigned int id,
 190                                 struct notifier_block *nb);
 191
 192 /*
 193  * Following API get the extcon device from devicetree.
 194  * This function use phandle of devicetree to get extcon device directly.
 195  */
 196 extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
 197                                                      int index);
 198
 199 /* Following API to get information of extcon device */
 200 extern const char *extcon_get_edev_name(struct extcon_dev *edev);
 201
 202
 203 #else /* CONFIG_EXTCON */
 204 static inline int extcon_dev_register(struct extcon_dev *edev)
 205 {
 206         return 0;
 207 }
 208
 209 static inline void extcon_dev_unregister(struct extcon_dev *edev) { }
 210
 211 static inline int devm_extcon_dev_register(struct device *dev,
 212                                            struct extcon_dev *edev)
 213 {
 214         return -EINVAL;
 215 }
 216
 217 static inline void devm_extcon_dev_unregister(struct device *dev,
 218                                               struct extcon_dev *edev) { }
 219
 220 static inline struct extcon_dev *extcon_dev_allocate(const unsigned int *cable)
 221 {
 222         return ERR_PTR(-ENOSYS);
 223 }
 224
 225 static inline void extcon_dev_free(struct extcon_dev *edev) { }
 226
 227 static inline struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
 228                                                 const unsigned int *cable)
 229 {
 230         return ERR_PTR(-ENOSYS);
 231 }
 232
 233 static inline void devm_extcon_dev_free(struct extcon_dev *edev) { }
 234
 235 static inline u32 extcon_get_state(struct extcon_dev *edev)
 236 {
 237         return 0;
 238 }
 239
 240 static inline int extcon_set_state(struct extcon_dev *edev, u32 state)
 241 {
 242         return 0;
 243 }
 244
 245 static inline int extcon_update_state(struct extcon_dev *edev, u32 mask,
 246                                        u32 state)
 247 {
 248         return 0;
 249 }
 250
 251 static inline int extcon_get_cable_state_(struct extcon_dev *edev,
 252                                           unsigned int id)
 253 {
 254         return 0;
 255 }
 256
 257 static inline int extcon_set_cable_state_(struct extcon_dev *edev,
 258                                           unsigned int id, bool cable_state)
 259 {
 260         return 0;
 261 }
 262
 263 static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
 264 {
 265         return NULL;
 266 }
 267
 268 static inline int extcon_register_notifier(struct extcon_dev *edev,
 269                                         unsigned int id,
 270                                         struct notifier_block *nb)
 271 {
 272         return 0;
 273 }
 274
 275 static inline int extcon_unregister_notifier(struct extcon_dev *edev,
 276                                         unsigned int id,
 277                                         struct notifier_block *nb)
 278 {
 279         return 0;
 280 }
 281
 282 static inline int devm_extcon_register_notifier(struct device *dev,
 283                                 struct extcon_dev *edev, unsigned int id,
 284                                 struct notifier_block *nb)
 285 {
 286         return -ENOSYS;
 287 }
 288
 289 static inline  void devm_extcon_unregister_notifier(struct device *dev,
 290                                 struct extcon_dev *edev, unsigned int id,
 291                                 struct notifier_block *nb) { }
 292
 293 static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
 294                                                             int index)
 295 {
 296         return ERR_PTR(-ENODEV);
 297 }
 298 #endif /* CONFIG_EXTCON */
 299
 300 /*
 301  * Following structure and API are deprecated. EXTCON remains the function
 302  * definition to prevent the build break.
 303  */
 304 struct extcon_specific_cable_nb {
 305        struct notifier_block *user_nb;
 306        int cable_index;
 307        struct extcon_dev *edev;
 308        unsigned long previous_value;
 309 };
 310
 311 static inline int extcon_register_interest(struct extcon_specific_cable_nb *obj,
 312                         const char *extcon_name, const char *cable_name,
 313                         struct notifier_block *nb)
 314 {
 315         return -EINVAL;
 316 }
 317
 318 static inline int extcon_unregister_interest(struct extcon_specific_cable_nb
 319                                                     *obj)
 320 {
 321         return -EINVAL;
 322 }
 323 #endif /* __LINUX_EXTCON_H__ */