Commit bd804eba authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Linus Torvalds
Browse files

PM: Introduce pm_power_off_prepare 



Introduce the pm_power_off_prepare() callback that can be registered by the
interested platforms in analogy with pm_idle() and pm_power_off(), used for
preparing the system to power off (needed by ACPI).

This allows us to drop acpi_sysclass and device_acpi that are only defined in
order to register the ACPI power off preparation callback, which is needed by
pm_power_off() registered in a much different way.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d7372cdf

drivers/acpi/sleep/poweroff.c

+9 −29
Original line number Diff line number Diff line
@@ -39,7 +39,13 @@ int acpi_sleep_prepare(u32 acpi_state) 


#ifdef CONFIG_PM



void acpi_power_off(void)

static void acpi_power_off_prepare(void)

{

	/* Prepare to power off the system */

	acpi_sleep_prepare(ACPI_STATE_S5);

}



static void acpi_power_off(void)

{

	/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */

	printk("%s called\n", __FUNCTION__);
@@ -48,27 +54,6 @@ void acpi_power_off(void) 
	acpi_enter_sleep_state(ACPI_STATE_S5);

}



static int acpi_shutdown(struct sys_device *x)

{

	switch (system_state) {

	case SYSTEM_POWER_OFF:

		/* Prepare to power off the system */

		return acpi_sleep_prepare(ACPI_STATE_S5);

	default:

		return 0;

	}

}



static struct sysdev_class acpi_sysclass = {

	set_kset_name("acpi"),

	.shutdown = acpi_shutdown

};



static struct sys_device device_acpi = {

	.id = 0,

	.cls = &acpi_sysclass,

};



static int acpi_poweroff_init(void)

{

	if (!acpi_disabled) {
@@ -78,13 +63,8 @@ static int acpi_poweroff_init(void) 
		status =

		    acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);

		if (ACPI_SUCCESS(status)) {

			int error;

			error = sysdev_class_register(&acpi_sysclass);

			if (!error)

				error = sysdev_register(&device_acpi);

			if (!error)

			pm_power_off_prepare = acpi_power_off_prepare;

			pm_power_off = acpi_power_off;

			return error;

		}

	}

	return 0;

include/linux/pm.h

+1 −0
Original line number Diff line number Diff line
@@ -101,6 +101,7 @@ struct pm_dev 
 */

extern void (*pm_idle)(void);

extern void (*pm_power_off)(void);

extern void (*pm_power_off_prepare)(void);



typedef int __bitwise suspend_state_t;

kernel/sys.c

+9 −0
Original line number Diff line number Diff line
@@ -99,6 +99,13 @@ int C_A_D = 1; 
struct pid *cad_pid;

EXPORT_SYMBOL(cad_pid);



/*

 * If set, this is used for preparing the system to power off.

 */



void (*pm_power_off_prepare)(void);

EXPORT_SYMBOL(pm_power_off_prepare);



/*

 *	Notifier list for kernel code which wants to be called

 *	at shutdown. This is used to stop any idling DMA operations
@@ -867,6 +874,8 @@ EXPORT_SYMBOL_GPL(kernel_halt); 
void kernel_power_off(void)

{

	kernel_shutdown_prepare(SYSTEM_POWER_OFF);

	if (pm_power_off_prepare)

		pm_power_off_prepare();

	printk(KERN_EMERG "Power down.\n");

	machine_power_off();

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE