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watchdog: add nowayout helpers to Watchdog Timer Driver Kernel API

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Add two nowayout helpers for the Watchdog Timer Driver Kernel API.
And apply this to the already converted drivers.
Note: s3c2410_wdt lost the nowayout feature during the conversion.

Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Wim Van Sebroeck 2011-11-29 16:24:16 +01:00
parent b8ec61189f
commit ff0b3cd4a4
4 changed files with 28 additions and 9 deletions
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10
Documentation/watchdog/watchdog-kernel-api.txt
View File

@ -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.

2
drivers/watchdog/s3c2410_wdt.c
View File

@ -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);

4
drivers/watchdog/wm831x_wdt.c
View File

@ -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++)

21
include/linux/watchdog.h
View File

@ -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)
{