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watchdog: stmp3xxx: Stop the watchdog on system halt

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This allows the system to actually halt even if userspace forgot to
disable the watchdog first. Old behaviour was that the watchdog forced
the system to boot again.

Signed-off-by: Harald Geyer <harald@ccbib.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Harald Geyer 2015-12-12 14:32:15 +00:00 committed by Wim Van Sebroeck
parent bdecfcdb54
commit 8d2fa17151
1 changed files with 28 additions and 0 deletions
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28
drivers/watchdog/stmp3xxx_rtc_wdt.c
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@ -14,6 +14,8 @@
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/stmp3xxx_rtc_wdt.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#define WDOG_TICK_RATE 1000 /* 1 kHz clock */
#define STMP3XXX_DEFAULT_TIMEOUT 19
@ -69,6 +71,28 @@ static struct watchdog_device stmp3xxx_wdd = {
.status = WATCHDOG_NOWAYOUT_INIT_STATUS,
};
static int wdt_notify_sys(struct notifier_block *nb, unsigned long code,
void *unused)
{
struct device *dev = watchdog_get_drvdata(&stmp3xxx_wdd);
struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev);
switch (code) {
case SYS_DOWN: /* keep enabled, system might crash while going down */
break;
case SYS_HALT: /* allow the system to actually halt */
case SYS_POWER_OFF:
wdt_stop(&stmp3xxx_wdd);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block wdt_notifier = {
.notifier_call = wdt_notify_sys,
};
static int stmp3xxx_wdt_probe(struct platform_device *pdev)
{
int ret;
@ -84,6 +108,9 @@ static int stmp3xxx_wdt_probe(struct platform_device *pdev)
return ret;
}
if (register_reboot_notifier(&wdt_notifier))
dev_warn(&pdev->dev, "cannot register reboot notifier\n");
dev_info(&pdev->dev, "initialized watchdog with heartbeat %ds\n",
stmp3xxx_wdd.timeout);
return 0;
@ -91,6 +118,7 @@ static int stmp3xxx_wdt_probe(struct platform_device *pdev)
static int stmp3xxx_wdt_remove(struct platform_device *pdev)
{
unregister_reboot_notifier(&wdt_notifier);
watchdog_unregister_device(&stmp3xxx_wdd);
return 0;
}