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watchdog: da9063: Add restart handler support

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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: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Steve Twiss <stwiss.opensource@diasemi.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Geert Uytterhoeven 2015-01-29 15:26:05 +01:00 committed by Wim Van Sebroeck
parent 9a4c880164
commit 396f163ceb
1 changed files with 31 additions and 1 deletions
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32
drivers/watchdog/da9063_wdt.c
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@ -20,6 +20,7 @@
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/mfd/da9063/registers.h> #include <linux/mfd/da9063/registers.h>
#include <linux/mfd/da9063/core.h> #include <linux/mfd/da9063/core.h>
#include <linux/reboot.h>
#include <linux/regmap.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_watchdog {
struct da9063 *da9063; struct da9063 *da9063;
struct watchdog_device wdtdev; struct watchdog_device wdtdev;
struct notifier_block restart_handler;
}; };
static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs) 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; 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 = { static const struct watchdog_info da9063_watchdog_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "DA9063 Watchdog", .identity = "DA9063 Watchdog",
@ -163,14 +182,25 @@ static int da9063_wdt_probe(struct platform_device *pdev)
dev_set_drvdata(&pdev->dev, wdt); dev_set_drvdata(&pdev->dev, wdt);
ret = watchdog_register_device(&wdt->wdtdev); ret = watchdog_register_device(&wdt->wdtdev);
if (ret)
return 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) static int da9063_wdt_remove(struct platform_device *pdev)
{ {
struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev); struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev);
unregister_restart_handler(&wdt->restart_handler);
watchdog_unregister_device(&wdt->wdtdev); watchdog_unregister_device(&wdt->wdtdev);
return 0; return 0;