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 NULL or be NULL (no mutually exclusive
17 * cables). 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 * @state: Attach/detach state of this extcon. Do not provide at
24 * register-time.
25 * @nh_all: Notifier for the state change events for all supported
26 * external connectors from this extcon.
27 * @nh: Notifier for the state change events from this extcon
28 * @entry: To support list of extcon devices so that users can
29 * search for extcon devices based on the extcon name.
30 * @lock:
31 * @max_supported: Internal value to store the number of cables.
32 * @extcon_dev_type: Device_type struct to provide attribute_groups
33 * customized for each extcon device.
34 * @cables: Sysfs subdirectories. Each represents one cable.
35 *
36 * In most cases, users only need to provide "User initializing data" of
37 * this struct when registering an extcon. In some exceptional cases,
38 * optional callbacks may be needed. However, the values in "internal data"
39 * are overwritten by register function.
40 */
41 struct extcon_dev {
42 /* Optional user initializing data */
43 const char *name;
44 const unsigned int *supported_cable;
45 const u32 *mutually_exclusive;
46
47 /* Internal data. Please do not set. */
48 struct device dev;
49 struct raw_notifier_head nh_all;
50 struct raw_notifier_head *nh;
51 struct list_head entry;
52 int max_supported;
53 spinlock_t lock; /* could be called by irq handler */
54 u32 state;
55
56 /* /sys/class/extcon/.../cable.n/... */
57 struct device_type extcon_dev_type;
58 struct extcon_cable *cables;
59
60 /* /sys/class/extcon/.../mutually_exclusive/... */
61 struct attribute_group attr_g_muex;
62 struct attribute **attrs_muex;
63 struct device_attribute *d_attrs_muex;
64 };
65
66 #endif /* __LINUX_EXTCON_INTERNAL_H__ */