diff options
Diffstat (limited to 'drivers/extcon/extcon.h')
| -rw-r--r-- | drivers/extcon/extcon.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/extcon/extcon.h b/drivers/extcon/extcon.h new file mode 100644 index 0000000000..9461826877 --- /dev/null +++ b/drivers/extcon/extcon.h @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __LINUX_EXTCON_INTERNAL_H__ +#define __LINUX_EXTCON_INTERNAL_H__ + +#include <linux/extcon-provider.h> + +/** + * struct extcon_dev - An extcon device represents one external connector. + * @name: The name of this extcon device. Parent device name is + * used if NULL. + * @supported_cable: Array of supported cable names ending with EXTCON_NONE. + * If supported_cable is NULL, cable name related APIs + * are disabled. + * @mutually_exclusive: Array of mutually exclusive set of cables that cannot + * be attached simultaneously. The array should be + * ending with 0 or be NULL (no mutually exclusive cables). + * For example, if it is {0x7, 0x30, 0}, then, + * {0, 1}, {0, 1, 2}, {0, 2}, {1, 2}, or {4, 5} cannot + * be attached simulataneously. {0x7, 0} is equivalent to + * {0x3, 0x6, 0x5, 0}. If it is {0xFFFFFFFF, 0}, there + * can be no simultaneous connections. + * @dev: Device of this extcon. + * @id: Unique device ID of this extcon. + * @state: Attach/detach state of this extcon. Do not provide at + * register-time. + * @nh_all: Notifier for the state change events for all supported + * external connectors from this extcon. + * @nh: Notifier for the state change events from this extcon + * @entry: To support list of extcon devices so that users can + * search for extcon devices based on the extcon name. + * @lock: Protects device state and serialises device registration + * @max_supported: Internal value to store the number of cables. + * @extcon_dev_type: Device_type struct to provide attribute_groups + * customized for each extcon device. + * @cables: Sysfs subdirectories. Each represents one cable. + * + * In most cases, users only need to provide "User initializing data" of + * this struct when registering an extcon. In some exceptional cases, + * optional callbacks may be needed. However, the values in "internal data" + * are overwritten by register function. + */ +struct extcon_dev { + /* Optional user initializing data */ + const char *name; + const unsigned int *supported_cable; + const u32 *mutually_exclusive; + + /* Internal data. Please do not set. */ + struct device dev; + unsigned int id; + struct raw_notifier_head nh_all; + struct raw_notifier_head *nh; + struct list_head entry; + int max_supported; + spinlock_t lock; /* could be called by irq handler */ + u32 state; + + /* /sys/class/extcon/.../cable.n/... */ + struct device_type extcon_dev_type; + struct extcon_cable *cables; + + /* /sys/class/extcon/.../mutually_exclusive/... */ + struct attribute_group attr_g_muex; + struct attribute **attrs_muex; + struct device_attribute *d_attrs_muex; +}; + +#endif /* __LINUX_EXTCON_INTERNAL_H__ */ |