[PATCH v8 22/27] ACPI: power: Switch to sys-off handler API

[Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>]

Switch to sys-off API that replaces legacy pm_power_off callbacks,
allowing us to remove global pm_* variables and support chaining of
all restart and power-off modes consistently.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>
---
 drivers/acpi/sleep.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index c992e57b2c79..c3e3cee27f01 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -1023,20 +1023,22 @@ static void acpi_sleep_hibernate_setup(void)
 static inline void acpi_sleep_hibernate_setup(void) {}
 #endif /* !CONFIG_HIBERNATION */
 
-static void acpi_power_off_prepare(void)
+static int acpi_power_off_prepare(struct sys_off_data *data)
 {
        /* Prepare to power off the system */
        acpi_sleep_prepare(ACPI_STATE_S5);
        acpi_disable_all_gpes();
        acpi_os_wait_events_complete();
+       return NOTIFY_DONE;
 }
 
-static void acpi_power_off(void)
+static int acpi_power_off(struct sys_off_data *data)
 {
        /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
        pr_debug("%s called\n", __func__);
        local_irq_disable();
        acpi_enter_sleep_state(ACPI_STATE_S5);
+       return NOTIFY_DONE;
 }
 
 int __init acpi_sleep_init(void)
@@ -1055,8 +1057,14 @@ int __init acpi_sleep_init(void)
 
        if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
                sleep_states[ACPI_STATE_S5] = 1;
-               pm_power_off_prepare = acpi_power_off_prepare;
-               pm_power_off = acpi_power_off;
+
+               register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE,
+                                        SYS_OFF_PRIO_FIRMWARE,
+                                        acpi_power_off_prepare, NULL);
+
+               register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
+                                        SYS_OFF_PRIO_FIRMWARE,
+                                        acpi_power_off, NULL);
        } else {
                acpi_no_s5 = true;
        }
-- 
2.35.1