[PATCH 20/44] power/reset: restart-poweroff: Register with kernel poweroff handler

Guenter Roeck
2014-10-07T05:28:22Z

Register with kernel poweroff handler instead of seting pm_power_off
directly. Register as poweroff handler of last resort since the driver
does not really power off the system but executes a restart.

Cc: Sebastian Reichel <sre@kernel.org>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/power/reset/restart-poweroff.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/power/reset/restart-poweroff.c b/drivers/power/reset/restart-poweroff.c
index edd707e..5437697 100644
--- a/drivers/power/reset/restart-poweroff.c
+++ b/drivers/power/reset/restart-poweroff.c
@@ -12,35 +12,34 @@
*/
#include <linux/kernel.h>
#include <linux/init.h>
+#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>
#include <linux/module.h>
+#include <linux/pm.h>
#include <linux/reboot.h>
-#include <asm/system_misc.h>

-static void restart_poweroff_do_poweroff(void)
+static int restart_poweroff_do_poweroff(struct notifier_block *this,
+ unsigned long unused1, void *unused2)
{
reboot_mode = REBOOT_HARD;
machine_restart(NULL);
+
+ return NOTIFY_DONE;
}

+static struct notifier_block restart_poweroff_handler = {
+ .notifier_call = restart_poweroff_do_poweroff,
+};
+
static int restart_poweroff_probe(struct platform_device *pdev)
{
- /* If a pm_power_off function has already been added, leave it alone */
- if (pm_power_off != NULL) {
- dev_err(&pdev->dev,
- "pm_power_off function already registered");
- return -EBUSY;
- }
-
- pm_power_off = &restart_poweroff_do_poweroff;
- return 0;
+ return register_poweroff_handler(&restart_poweroff_handler);
}

static int restart_poweroff_remove(struct platform_device *pdev)
{
- if (pm_power_off == &restart_poweroff_do_poweroff)
- pm_power_off = NULL;
+ unregister_poweroff_handler(&restart_poweroff_handler);

return 0;
}
--
1.9.1