From: Rafael J. Wysocki Date: Thu, 19 Jul 2007 08:47:40 +0000 (-0700) Subject: PM: Introduce pm_power_off_prepare X-Git-Tag: v2.6.23-rc1~450 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd804eba1c8597cbb7cd5a5f9fe886aae16a079a;p=linux-2.6 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: Rafael J. Wysocki Acked-by: Pavel Machek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/acpi/sleep/poweroff.c b/drivers/acpi/sleep/poweroff.c index 240dde9cf1..39e40d56b0 100644 --- a/drivers/acpi/sleep/poweroff.c +++ b/drivers/acpi/sleep/poweroff.c @@ -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 = acpi_power_off; - return error; + pm_power_off_prepare = acpi_power_off_prepare; + pm_power_off = acpi_power_off; } } return 0; diff --git a/include/linux/pm.h b/include/linux/pm.h index 2735b7cadd..ad3cc2eb0d 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -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; diff --git a/kernel/sys.c b/kernel/sys.c index 18987c7f6a..d40e40a944 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -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(); }