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backlight: Remove notifier

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backlight_register_notifier and backlight_unregister_notifier have
been unused since commit 6cb634d0dc ("ACPI: video: Remove code to
unregister acpi_video backlight when a native backlight registers")

With those not being called, it means that the backlight_notifier
list is always empty.

Remove the functions, the list itself and the enum used in the
notifications.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch>
Link: https://lore.kernel.org/r/20240919232758.639925-1-linux@treblig.org
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Dr. David Alan Gilbert 2024-09-20 00:27:58 +01:00 committed by Lee Jones
parent 1a2dc9bf3b
commit 5461f3fd74
2 changed files with 0 additions and 62 deletions
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42
drivers/video/backlight/backlight.c
View File

@ -65,7 +65,6 @@
static struct list_head backlight_dev_list;
static struct mutex backlight_dev_list_mutex;
static struct blocking_notifier_head backlight_notifier;
static const char *const backlight_types[] = {
[BACKLIGHT_RAW] = "raw",
@ -467,9 +466,6 @@ struct backlight_device *backlight_device_register(const char *name,
list_add(&new_bd->entry, &backlight_dev_list);
mutex_unlock(&backlight_dev_list_mutex);
blocking_notifier_call_chain(&backlight_notifier,
BACKLIGHT_REGISTERED, new_bd);
return new_bd;
}
EXPORT_SYMBOL(backlight_device_register);
@ -539,9 +535,6 @@ void backlight_device_unregister(struct backlight_device *bd)
mutex_unlock(&pmac_backlight_mutex);
#endif
blocking_notifier_call_chain(&backlight_notifier,
BACKLIGHT_UNREGISTERED, bd);
mutex_lock(&bd->ops_lock);
bd->ops = NULL;
mutex_unlock(&bd->ops_lock);
@ -566,40 +559,6 @@ static int devm_backlight_device_match(struct device *dev, void *res,
return *r == data;
}
/**
* backlight_register_notifier - get notified of backlight (un)registration
* @nb: notifier block with the notifier to call on backlight (un)registration
*
* Register a notifier to get notified when backlight devices get registered
* or unregistered.
*
* RETURNS:
*
* 0 on success, otherwise a negative error code
*/
int backlight_register_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&backlight_notifier, nb);
}
EXPORT_SYMBOL(backlight_register_notifier);
/**
* backlight_unregister_notifier - unregister a backlight notifier
* @nb: notifier block to unregister
*
* Register a notifier to get notified when backlight devices get registered
* or unregistered.
*
* RETURNS:
*
* 0 on success, otherwise a negative error code
*/
int backlight_unregister_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&backlight_notifier, nb);
}
EXPORT_SYMBOL(backlight_unregister_notifier);
/**
* devm_backlight_device_register - register a new backlight device
* @dev: the device to register
@ -767,7 +726,6 @@ static int __init backlight_class_init(void)
INIT_LIST_HEAD(&backlight_dev_list);
mutex_init(&backlight_dev_list_mutex);
BLOCKING_INIT_NOTIFIER_HEAD(&backlight_notifier);
return 0;
}

20
include/linux/backlight.h
View File

@ -66,24 +66,6 @@ enum backlight_type {
BACKLIGHT_TYPE_MAX,
};
/**
* enum backlight_notification - the type of notification
*
* The notifications that is used for notification sent to the receiver
* that registered notifications using backlight_register_notifier().
*/
enum backlight_notification {
/**
* @BACKLIGHT_REGISTERED: The backlight device is registered.
*/
BACKLIGHT_REGISTERED,
/**
* @BACKLIGHT_UNREGISTERED: The backlight revice is unregistered.
*/
BACKLIGHT_UNREGISTERED,
};
/** enum backlight_scale - the type of scale used for brightness values
*
* The type of scale used for brightness values.
@ -421,8 +403,6 @@ void devm_backlight_device_unregister(struct device *dev,
struct backlight_device *bd);
void backlight_force_update(struct backlight_device *bd,
enum backlight_update_reason reason);
int backlight_register_notifier(struct notifier_block *nb);
int backlight_unregister_notifier(struct notifier_block *nb);
struct backlight_device *backlight_device_get_by_name(const char *name);
struct backlight_device *backlight_device_get_by_type(enum backlight_type type);
int backlight_device_set_brightness(struct backlight_device *bd,