Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 396f163c authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Wim Van Sebroeck
Browse files

watchdog: da9063: Add restart handler support 



Register a restart handler for the da9063 watchdog.  System restart is
triggered by sending the shutdown command to the PMIC.
As more-suitable restart handlers may exist, the priority of the
watchdog restart handler is set to 128.

The actual restart method was inspired by a platform-specific patch from
the BSP by Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>.

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Acked-by: default avatarSteve Twiss <stwiss.opensource@diasemi.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 9a4c8801

drivers/watchdog/da9063_wdt.c

+31 −1
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/delay.h>

#include <linux/mfd/da9063/registers.h>

#include <linux/mfd/da9063/core.h>

#include <linux/reboot.h>

#include <linux/regmap.h>



/*
@@ -38,6 +39,7 @@ static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 }; 
struct da9063_watchdog {

	struct da9063 *da9063;

	struct watchdog_device wdtdev;

	struct notifier_block restart_handler;

};



static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
@@ -119,6 +121,23 @@ static int da9063_wdt_set_timeout(struct watchdog_device *wdd, 
	return ret;

}



static int da9063_wdt_restart_handler(struct notifier_block *this,

				      unsigned long mode, void *cmd)

{

	struct da9063_watchdog *wdt = container_of(this,

						   struct da9063_watchdog,

						   restart_handler);

	int ret;



	ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,

			   DA9063_SHUTDOWN);

	if (ret)

		dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n",

			  ret);



	return NOTIFY_DONE;

}



static const struct watchdog_info da9063_watchdog_info = {

	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,

	.identity = "DA9063 Watchdog",
@@ -163,14 +182,25 @@ static int da9063_wdt_probe(struct platform_device *pdev) 
	dev_set_drvdata(&pdev->dev, wdt);



	ret = watchdog_register_device(&wdt->wdtdev);



	if (ret)

		return ret;



	wdt->restart_handler.notifier_call = da9063_wdt_restart_handler;

	wdt->restart_handler.priority = 128;

	ret = register_restart_handler(&wdt->restart_handler);

	if (ret)

		dev_err(wdt->da9063->dev,

			"Failed to register restart handler (err = %d)\n", ret);



	return 0;

}



static int da9063_wdt_remove(struct platform_device *pdev)

{

	struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev);



	unregister_restart_handler(&wdt->restart_handler);



	watchdog_unregister_device(&wdt->wdtdev);



	return 0;