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__ */ 69