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kernel/reboot: Add devm_register_power_off_handler() 

Add devm_register_power_off_handler() helper that registers sys-off
handler using power-off mode and with a default priority. Most drivers
will want to register power-off handler with a default priority, so this
helper will reduce the boilerplate code and make code easier to read and
follow.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dmitry Osipenko 2022-05-10 02:32:34 +03:00 committed by Rafael J. Wysocki
parent eae813b755
commit d2c5415327
2 changed files with 26 additions and 0 deletions
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4
include/linux/reboot.h
View File

@ -141,6 +141,10 @@ int devm_register_sys_off_handler(struct device *dev,
int (*callback)(struct sys_off_data *data),
void *cb_data);
int devm_register_power_off_handler(struct device *dev,
int (*callback)(struct sys_off_data *data),
void *cb_data);
int register_platform_power_off(void (*power_off)(void));
void unregister_platform_power_off(void (*power_off)(void));

22
kernel/reboot.c
View File

@ -462,6 +462,28 @@ int devm_register_sys_off_handler(struct device *dev,
}
EXPORT_SYMBOL_GPL(devm_register_sys_off_handler);
/**
* devm_register_power_off_handler - Register power-off handler
* @dev: Device that registers callback
* @callback: Callback function
* @cb_data: Callback's argument
*
* Registers resource-managed sys-off handler with a default priority
* and using power-off mode.
*
* Returns zero on success, or error code on failure.
*/
int devm_register_power_off_handler(struct device *dev,
int (*callback)(struct sys_off_data *data),
void *cb_data)
{
return devm_register_sys_off_handler(dev,
SYS_OFF_MODE_POWER_OFF,
SYS_OFF_PRIO_DEFAULT,
callback, cb_data);
}
EXPORT_SYMBOL_GPL(devm_register_power_off_handler);
static struct sys_off_handler *platform_power_off_handler;
static int platform_power_off_notify(struct sys_off_data *data)