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815429b39d
The extcon core already provides the extcon_register_notifier() function in order to register the notifier block which is used to monitor the state change for the specific external connector such as EXTCON_USB, EXTCON_USB_HOST and so on. The extcon consumer uses the this function. The extcon consumer might need to monitor the all supported external connectors from the extcon device. In this case, The extcon consumer should have each notifier_block structure for each external connector. This patch adds the new extcon_register_notifier_all() function that extcon consumer is able to monitor the state change of all supported external connectors by using only one notifier_block structure. - List of new added functions: int extcon_register_notifier_all(struct extcon_dev *edev, struct notifier_block *nb); int extcon_unregister_notifier_all(struct extcon_dev *edev, struct notifier_block *nb); int devm_extcon_register_notifier_all(struct device *dev, struct extcon_dev *edev, struct notifier_block *nb); void devm_extcon_unregister_notifier_all(struct device *dev, struct extcon_dev *edev, struct notifier_block *nb); Suggested-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Tested-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Hans de Goede <hdegoede@redhat.com>
66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
#ifndef __LINUX_EXTCON_INTERNAL_H__
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#define __LINUX_EXTCON_INTERNAL_H__
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#include <linux/extcon.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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