drivers/extcon/extcon.h

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