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176aa36012
The extcon has two type of extcon devices as following.
- 'extcon provider deivce' adds new extcon device and detect the
state/properties of external connector. Also, it notifies the
state/properties to the extcon consumer device.
- 'extcon consumer device' gets the change state/properties
from extcon provider device.
Prior to that, include/linux/extcon.h contains all exported API for
both provider and consumer device driver. To clarify the meaning of
header file and to remove the wrong use-case on consumer device,
this patch separates into extcon.h and extcon-provider.h.
[Description for include/linux/{extcon.h|extcon-provider.h}]
- extcon.h includes the extcon API and data structure for extcon consumer
device driver. This header file contains the following APIs:
: Register/unregister the notifier to catch the change of extcon device
: Get the extcon device instance
: Get the extcon device name
: Get the state of each external connector
: Get the property value of each external connector
: Get the property capability of each external connector
- extcon-provider.h includes the extcon API and data structure for extcon
provider device driver. This header file contains the following APIs:
: Include 'include/linux/extcon.h'
: Allocate the memory for extcon device instance
: Register/unregister extcon device
: Set the state of each external connector
: Set the property value of each external connector
: Set the property capability of each external connector
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
66 lines
2.5 KiB
C
66 lines
2.5 KiB
C
#ifndef __LINUX_EXTCON_INTERNAL_H__
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#define __LINUX_EXTCON_INTERNAL_H__
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#include <linux/extcon-provider.h>
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/**
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* struct extcon_dev - An extcon device represents one external connector.
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* @name: The name of this extcon device. Parent device name is
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* used if NULL.
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* @supported_cable: Array of supported cable names ending with EXTCON_NONE.
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* If supported_cable is NULL, cable name related APIs
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* are disabled.
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* @mutually_exclusive: Array of mutually exclusive set of cables that cannot
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* be attached simultaneously. The array should be
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* ending with NULL or be NULL (no mutually exclusive
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* cables). For example, if it is { 0x7, 0x30, 0}, then,
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* {0, 1}, {0, 1, 2}, {0, 2}, {1, 2}, or {4, 5} cannot
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* be attached simulataneously. {0x7, 0} is equivalent to
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* {0x3, 0x6, 0x5, 0}. If it is {0xFFFFFFFF, 0}, there
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* can be no simultaneous connections.
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* @dev: Device of this extcon.
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* @state: Attach/detach state of this extcon. Do not provide at
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* register-time.
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* @nh_all: Notifier for the state change events for all supported
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* external connectors from this extcon.
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* @nh: Notifier for the state change events from this extcon
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* @entry: To support list of extcon devices so that users can
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* search for extcon devices based on the extcon name.
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* @lock:
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* @max_supported: Internal value to store the number of cables.
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* @extcon_dev_type: Device_type struct to provide attribute_groups
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* customized for each extcon device.
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* @cables: Sysfs subdirectories. Each represents one cable.
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*
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* In most cases, users only need to provide "User initializing data" of
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* this struct when registering an extcon. In some exceptional cases,
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* optional callbacks may be needed. However, the values in "internal data"
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* are overwritten by register function.
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*/
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struct extcon_dev {
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/* Optional user initializing data */
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const char *name;
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const unsigned int *supported_cable;
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const u32 *mutually_exclusive;
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/* Internal data. Please do not set. */
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struct device dev;
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struct raw_notifier_head nh_all;
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struct raw_notifier_head *nh;
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struct list_head entry;
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int max_supported;
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spinlock_t lock; /* could be called by irq handler */
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u32 state;
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/* /sys/class/extcon/.../cable.n/... */
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struct device_type extcon_dev_type;
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struct extcon_cable *cables;
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/* /sys/class/extcon/.../mutually_exclusive/... */
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struct attribute_group attr_g_muex;
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struct attribute **attrs_muex;
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struct device_attribute *d_attrs_muex;
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};
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#endif /* __LINUX_EXTCON_INTERNAL_H__ */
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