Commit fb61375e authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Rafael J. Wysocki
Browse files

kernel/reboot: Add register_platform_power_off() 



Add platform-level registration helpers that will ease transition of the
arch/platform power-off callbacks to the new sys-off based API, allowing
us to remove the global pm_power_off variable in the future.

Signed-off-by: default avatarDmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 0e2110d2

include/linux/reboot.h

+3 −0
Original line number Original line Diff line number Diff line
@@ -141,6 +141,9 @@ int devm_register_sys_off_handler(struct device *dev, 
				  int (*callback)(struct sys_off_data *data),

				  int (*callback)(struct sys_off_data *data),

				  void *cb_data);

				  void *cb_data);





int register_platform_power_off(void (*power_off)(void));

void unregister_platform_power_off(void (*power_off)(void));



/*

/*

 * Architecture independent implemenations of sys_reboot commands.

 * Architecture independent implemenations of sys_reboot commands.

 */

 */

kernel/reboot.c

+55 −0
Original line number Original line Diff line number Diff line
@@ -469,6 +469,61 @@ int devm_register_sys_off_handler(struct device *dev, 
}

}

EXPORT_SYMBOL_GPL(devm_register_sys_off_handler);

EXPORT_SYMBOL_GPL(devm_register_sys_off_handler);





static struct sys_off_handler *platform_power_off_handler;



static int platform_power_off_notify(struct sys_off_data *data)

{

	void (*platform_power_power_off_cb)(void) = data->cb_data;



	platform_power_power_off_cb();



	return NOTIFY_DONE;

}



/**

 *	register_platform_power_off - Register platform-level power-off callback

 *	@power_off: Power-off callback

 *

 *	Registers power-off callback that will be called as last step

 *	of the power-off sequence. This callback is expected to be invoked

 *	for the last resort. Only one platform power-off callback is allowed

 *	to be registered at a time.

 *

 *	Returns zero on success, or error code on failure.

 */

int register_platform_power_off(void (*power_off)(void))

{

	struct sys_off_handler *handler;



	handler = register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,

					   SYS_OFF_PRIO_PLATFORM,

					   platform_power_off_notify,

					   power_off);

	if (IS_ERR(handler))

		return PTR_ERR(handler);



	platform_power_off_handler = handler;



	return 0;

}

EXPORT_SYMBOL_GPL(register_platform_power_off);



/**

 *	unregister_platform_power_off - Unregister platform-level power-off callback

 *	@power_off: Power-off callback

 *

 *	Unregisters previously registered platform power-off callback.

 */

void unregister_platform_power_off(void (*power_off)(void))

{

	if (platform_power_off_handler &&

	    platform_power_off_handler->cb_data == power_off) {

		unregister_sys_off_handler(platform_power_off_handler);

		platform_power_off_handler = NULL;

	}

}

EXPORT_SYMBOL_GPL(unregister_platform_power_off);



static int legacy_pm_power_off_prepare(struct sys_off_data *data)

static int legacy_pm_power_off_prepare(struct sys_off_data *data)

{

{

	if (pm_power_off_prepare)

	if (pm_power_off_prepare)