diff options
| -rw-r--r-- | Documentation/watchdog/watchdog-kernel-api.txt | 10 | ||||
| -rw-r--r-- | drivers/watchdog/s3c2410_wdt.c | 2 | ||||
| -rw-r--r-- | drivers/watchdog/wm831x_wdt.c | 4 | ||||
| -rw-r--r-- | include/linux/watchdog.h | 21 |
4 files changed, 28 insertions, 9 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt index 4f7c894244d..4b93c28e35c 100644 --- a/Documentation/watchdog/watchdog-kernel-api.txt +++ b/Documentation/watchdog/watchdog-kernel-api.txt @@ -1,6 +1,6 @@ The Linux WatchDog Timer Driver Core kernel API. =============================================== -Last reviewed: 22-Jul-2011 +Last reviewed: 29-Nov-2011 Wim Van Sebroeck <wim@iguana.be> @@ -142,6 +142,14 @@ bit-operations. The status bits that are defined are: * WDOG_NO_WAY_OUT: this bit stores the nowayout setting for the watchdog. If this bit is set then the watchdog timer will not be able to stop. + To set the WDOG_NO_WAY_OUT status bit (before registering your watchdog + timer device) you can either: + * set it statically in your watchdog_device struct with + .status = WATCHDOG_NOWAYOUT_INIT_STATUS, + (this will set the value the same as CONFIG_WATCHDOG_NOWAYOUT) or + * use the following helper function: + static inline void watchdog_set_nowayout(struct watchdog_device *wdd, int nowayout) + Note: The WatchDog Timer Driver Core supports the magic close feature and the nowayout feature. To use the magic close feature you must set the WDIOF_MAGICCLOSE bit in the options field of the watchdog's info structure. diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c index a79e3840782..4bc3744e14e 100644 --- a/drivers/watchdog/s3c2410_wdt.c +++ b/drivers/watchdog/s3c2410_wdt.c @@ -378,6 +378,8 @@ static int __devinit s3c2410wdt_probe(struct platform_device *pdev) "cannot start\n"); } + watchdog_set_nowayout(&s3c2410_wdd, nowayout); + ret = watchdog_register_device(&s3c2410_wdd); if (ret) { dev_err(dev, "cannot register watchdog (%d)\n", ret); diff --git a/drivers/watchdog/wm831x_wdt.c b/drivers/watchdog/wm831x_wdt.c index beb3ad2294d..6cd1ba41b47 100644 --- a/drivers/watchdog/wm831x_wdt.c +++ b/drivers/watchdog/wm831x_wdt.c @@ -213,11 +213,9 @@ static int __devinit wm831x_wdt_probe(struct platform_device *pdev) wm831x_wdt->info = &wm831x_wdt_info; wm831x_wdt->ops = &wm831x_wdt_ops; + watchdog_set_nowayout(wm831x_wdt, nowayout); watchdog_set_drvdata(wm831x_wdt, driver_data); - if (nowayout) - wm831x_wdt->status |= WDOG_NO_WAY_OUT; - reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG); reg &= WM831X_WDOG_TO_MASK; for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++) diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h index 111843f88b2..43ba5b3ce2a 100644 --- a/include/linux/watchdog.h +++ b/include/linux/watchdog.h @@ -53,11 +53,7 @@ struct watchdog_info { #ifdef __KERNEL__ -#ifdef CONFIG_WATCHDOG_NOWAYOUT -#define WATCHDOG_NOWAYOUT 1 -#else -#define WATCHDOG_NOWAYOUT 0 -#endif +#include <linux/bitops.h> struct watchdog_ops; struct watchdog_device; @@ -122,6 +118,21 @@ struct watchdog_device { #define WDOG_NO_WAY_OUT 3 /* Is 'nowayout' feature set ? */ }; +#ifdef CONFIG_WATCHDOG_NOWAYOUT +#define WATCHDOG_NOWAYOUT 1 +#define WATCHDOG_NOWAYOUT_INIT_STATUS (1 << WDOG_NO_WAY_OUT) +#else +#define WATCHDOG_NOWAYOUT 0 +#define WATCHDOG_NOWAYOUT_INIT_STATUS 0 +#endif + +/* Use the following function to set the nowayout feature */ +static inline void watchdog_set_nowayout(struct watchdog_device *wdd, int nowayout) +{ + if (nowayout) + set_bit(WDOG_NO_WAY_OUT, &wdd->status); +} + /* Use the following functions to manipulate watchdog driver specific data */ static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data) { |