include/linux/extcon.h

   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
  80 /* Miscellaneous external connector */
  81 #define EXTCON_DOCK             60
  82 #define EXTCON_JIG              61
  83 #define EXTCON_MECHANICAL       62
  84
  85 #define EXTCON_NUM              63
  86
  87 /*
  88  * Define the properties of supported external connectors.
  89  *
  90  * When adding the new extcon property, they *must* have
  91  * the type/value/default information. Also, you *have to*
  92  * modify the EXTCON_PROP_[type]_START/END definitions
  93  * which mean the range of the supported properties
  94  * for each extcon type.
  95  *
  96  * The naming style of property
  97  * : EXTCON_PROP_[type]_[property name]
  98  *
  99  * EXTCON_PROP_USB_[property name]      : USB property
 100  * EXTCON_PROP_CHG_[property name]      : Charger property
 101  * EXTCON_PROP_JACK_[property name]     : Jack property
 102  * EXTCON_PROP_DISP_[property name]     : Display property
 103  */
 104
 105 /*
 106  * Properties of EXTCON_TYPE_USB.
 107  *
 108  * - EXTCON_PROP_USB_VBUS
 109  * @type:       integer (intval)
 110  * @value:      0 (low) or 1 (high)
 111  * @default:    0 (low)
 112  * - EXTCON_PROP_USB_TYPEC_POLARITY
 113  * @type:       integer (intval)
 114  * @value:      0 (normal) or 1 (flip)
 115  * @default:    0 (normal)
 116  * - EXTCON_PROP_USB_SS (SuperSpeed)
 117  * @type:       integer (intval)
 118  * @value:      0 (USB/USB2) or 1 (USB3)
 119  * @default:    0 (USB/USB2)
 120  *
 121  */
 122 #define EXTCON_PROP_USB_VBUS            0
 123 #define EXTCON_PROP_USB_TYPEC_POLARITY  1
 124 #define EXTCON_PROP_USB_SS              2
 125
 126 #define EXTCON_PROP_USB_MIN             0
 127 #define EXTCON_PROP_USB_MAX             2
 128 #define EXTCON_PROP_USB_CNT     (EXTCON_PROP_USB_MAX - EXTCON_PROP_USB_MIN + 1)
 129
 130 /* Properties of EXTCON_TYPE_CHG. */
 131 #define EXTCON_PROP_CHG_MIN             50
 132 #define EXTCON_PROP_CHG_MAX             50
 133 #define EXTCON_PROP_CHG_CNT     (EXTCON_PROP_CHG_MAX - EXTCON_PROP_CHG_MIN + 1)
 134
 135 /* Properties of EXTCON_TYPE_JACK. */
 136 #define EXTCON_PROP_JACK_MIN            100
 137 #define EXTCON_PROP_JACK_MAX            100
 138 #define EXTCON_PROP_JACK_CNT (EXTCON_PROP_JACK_MAX - EXTCON_PROP_JACK_MIN + 1)
 139
 140 /*
 141  * Properties of EXTCON_TYPE_DISP.
 142  *
 143  * - EXTCON_PROP_DISP_HPD (Hot Plug Detect)
 144  * @type:       integer (intval)
 145  * @value:      0 (no hpd) or 1 (hpd)
 146  * @default:    0 (no hpd)
 147  *
 148  */
 149 #define EXTCON_PROP_DISP_HPD            150
 150
 151 /* Properties of EXTCON_TYPE_DISP. */
 152 #define EXTCON_PROP_DISP_MIN            150
 153 #define EXTCON_PROP_DISP_MAX            151
 154 #define EXTCON_PROP_DISP_CNT (EXTCON_PROP_DISP_MAX - EXTCON_PROP_DISP_MIN + 1)
 155
 156 /*
 157  * Define the type of property's value.
 158  *
 159  * Define the property's value as union type. Because each property
 160  * would need the different data type to store it.
 161  */
 162 union extcon_property_value {
 163         int intval;     /* type : integer (intval) */
 164 };
 165
 166 struct extcon_dev;
 167
 168 #if IS_ENABLED(CONFIG_EXTCON)
 169 /*
 170  * Following APIs get the connected state of each external connector.
 171  * The 'id' argument indicates the defined external connector.
 172  */
 173 extern int extcon_get_state(struct extcon_dev *edev, unsigned int id);
 174
 175 /*
 176  * Following APIs get the property of each external connector.
 177  * The 'id' argument indicates the defined external connector
 178  * and the 'prop' indicates the extcon property.
 179  *
 180  * And extcon_get_property_capability() get the capability of the property
 181  * for each external connector. They are used to get the capability of the
 182  * property of each external connector based on the id and property.
 183  */
 184 extern int extcon_get_property(struct extcon_dev *edev, unsigned int id,
 185                                 unsigned int prop,
 186                                 union extcon_property_value *prop_val);
 187 extern int extcon_get_property_capability(struct extcon_dev *edev,
 188                                 unsigned int id, unsigned int prop);
 189
 190 /*
 191  * Following APIs register the notifier block in order to detect
 192  * the change of both state and property value for each external connector.
 193  *
 194  * extcon_register_notifier(*edev, id, *nb) : Register a notifier block
 195  *                      for specific external connector of the extcon.
 196  * extcon_register_notifier_all(*edev, *nb) : Register a notifier block
 197  *                      for all supported external connectors of the extcon.
 198  */
 199 extern int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
 200                                 struct notifier_block *nb);
 201 extern int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
 202                                 struct notifier_block *nb);
 203 extern int devm_extcon_register_notifier(struct device *dev,
 204                                 struct extcon_dev *edev, unsigned int id,
 205                                 struct notifier_block *nb);
 206 extern void devm_extcon_unregister_notifier(struct device *dev,
 207                                 struct extcon_dev *edev, unsigned int id,
 208                                 struct notifier_block *nb);
 209
 210 extern int extcon_register_notifier_all(struct extcon_dev *edev,
 211                                 struct notifier_block *nb);
 212 extern int extcon_unregister_notifier_all(struct extcon_dev *edev,
 213                                 struct notifier_block *nb);
 214 extern int devm_extcon_register_notifier_all(struct device *dev,
 215                                 struct extcon_dev *edev,
 216                                 struct notifier_block *nb);
 217 extern void devm_extcon_unregister_notifier_all(struct device *dev,
 218                                 struct extcon_dev *edev,
 219                                 struct notifier_block *nb);
 220
 221 /*
 222  * Following APIs get the extcon_dev from devicetree or by through extcon name.
 223  */
 224 extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
 225 extern struct extcon_dev *extcon_find_edev_by_node(struct device_node *node);
 226 extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
 227                                                      int index);
 228
 229 /* Following API get the name of extcon device. */
 230 extern const char *extcon_get_edev_name(struct extcon_dev *edev);
 231
 232 #else /* CONFIG_EXTCON */
 233 static inline int extcon_get_state(struct extcon_dev *edev, unsigned int id)
 234 {
 235         return 0;
 236 }
 237
 238 static inline int extcon_get_property(struct extcon_dev *edev, unsigned int id,
 239                                 unsigned int prop,
 240                                 union extcon_property_value *prop_val)
 241 {
 242         return 0;
 243 }
 244
 245 static inline int extcon_get_property_capability(struct extcon_dev *edev,
 246                                 unsigned int id, unsigned int prop)
 247 {
 248         return 0;
 249 }
 250
 251 static inline int extcon_register_notifier(struct extcon_dev *edev,
 252                                 unsigned int id, struct notifier_block *nb)
 253 {
 254         return 0;
 255 }
 256
 257 static inline int extcon_unregister_notifier(struct extcon_dev *edev,
 258                                 unsigned int id, struct notifier_block *nb)
 259 {
 260         return 0;
 261 }
 262
 263 static inline int devm_extcon_register_notifier(struct device *dev,
 264                                 struct extcon_dev *edev, unsigned int id,
 265                                 struct notifier_block *nb)
 266 {
 267         return -ENOSYS;
 268 }
 269
 270 static inline  void devm_extcon_unregister_notifier(struct device *dev,
 271                                 struct extcon_dev *edev, unsigned int id,
 272                                 struct notifier_block *nb) { }
 273
 274 static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
 275 {
 276         return ERR_PTR(-ENODEV);
 277 }
 278
 279 static inline struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
 280 {
 281         return ERR_PTR(-ENODEV);
 282 }
 283
 284 static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
 285                                 int index)
 286 {
 287         return ERR_PTR(-ENODEV);
 288 }
 289 #endif /* CONFIG_EXTCON */
 290
 291 /*
 292  * Following structure and API are deprecated. EXTCON remains the function
 293  * definition to prevent the build break.
 294  */
 295 struct extcon_specific_cable_nb {
 296        struct notifier_block *user_nb;
 297        int cable_index;
 298        struct extcon_dev *edev;
 299        unsigned long previous_value;
 300 };
 301
 302 static inline int extcon_register_interest(struct extcon_specific_cable_nb *obj,
 303                                 const char *extcon_name, const char *cable_name,
 304                                 struct notifier_block *nb)
 305 {
 306         return -EINVAL;
 307 }
 308
 309 static inline int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
 310 {
 311         return -EINVAL;
 312 }
 313 #endif /* __LINUX_EXTCON_H__ */