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: 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:
Родитель
9a4c880164
Коммит
396f163ceb
|
@ -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;
|
||||
|
||||
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;
|
||||
|
|
Загрузка…
Ссылка в новой задаче