drivers/extcon/extcon.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_EXTCON_INTERNAL_H__
   3 #define __LINUX_EXTCON_INTERNAL_H__
   4
   5 #include <linux/extcon-provider.h>
   6
   7 /**
   8  * struct extcon_dev - An extcon device represents one external connector.
   9  * @name:               The name of this extcon device. Parent device name is
  10  *                      used if NULL.
  11  * @supported_cable:    Array of supported cable names ending with EXTCON_NONE.
  12  *                      If supported_cable is NULL, cable name related APIs
  13  *                      are disabled.
  14  * @mutually_exclusive: Array of mutually exclusive set of cables that cannot
  15  *                      be attached simultaneously. The array should be
  16  *                      ending with 0 or be NULL (no mutually exclusive cables).
  17  *                      For example, if it is {0x7, 0x30, 0}, then,
  18  *                      {0, 1}, {0, 1, 2}, {0, 2}, {1, 2}, or {4, 5} cannot
  19  *                      be attached simulataneously. {0x7, 0} is equivalent to
  20  *                      {0x3, 0x6, 0x5, 0}. If it is {0xFFFFFFFF, 0}, there
  21  *                      can be no simultaneous connections.
  22  * @dev:                Device of this extcon.
  23  * @id:                 Unique device ID of this extcon.
  24  * @state:              Attach/detach state of this extcon. Do not provide at
  25  *                      register-time.
  26  * @nh_all:             Notifier for the state change events for all supported
  27  *                      external connectors from this extcon.
  28  * @nh:                 Notifier for the state change events from this extcon
  29  * @entry:              To support list of extcon devices so that users can
  30  *                      search for extcon devices based on the extcon name.
  31  * @lock:               Protects device state and serialises device registration
  32  * @max_supported:      Internal value to store the number of cables.
  33  * @extcon_dev_type:    Device_type struct to provide attribute_groups
  34  *                      customized for each extcon device.
  35  * @cables:             Sysfs subdirectories. Each represents one cable.
  36  *
  37  * In most cases, users only need to provide "User initializing data" of
  38  * this struct when registering an extcon. In some exceptional cases,
  39  * optional callbacks may be needed. However, the values in "internal data"
  40  * are overwritten by register function.
  41  */
  42 struct extcon_dev {
  43         /* Optional user initializing data */
  44         const char *name;
  45         const unsigned int *supported_cable;
  46         const u32 *mutually_exclusive;
  47
  48         /* Internal data. Please do not set. */
  49         struct device dev;
  50         unsigned int id;
  51         struct raw_notifier_head nh_all;
  52         struct raw_notifier_head *nh;
  53         struct list_head entry;
  54         int max_supported;
  55         spinlock_t lock;        /* could be called by irq handler */
  56         u32 state;
  57
  58         /* /sys/class/extcon/.../cable.n/... */
  59         struct device_type extcon_dev_type;
  60         struct extcon_cable *cables;
  61
  62         /* /sys/class/extcon/.../mutually_exclusive/... */
  63         struct attribute_group attr_g_muex;
  64         struct attribute **attrs_muex;
  65         struct device_attribute *d_attrs_muex;
  66 };
  67
  68 #endif /* __LINUX_EXTCON_INTERNAL_H__ */