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authorHauke Mehrtens <hauke@hauke-m.de>2013-01-12 18:14:07 +0100
committerWim Van Sebroeck <wim@iguana.be>2013-03-01 12:47:13 +0100
commit5434a04db905bb0af281cdb758d1357fbecd0fe8 (patch)
treeb87b6045e6d308a495e70be16564e879061f3bb9 /drivers/watchdog
parent52e5cc4efa576223174ad4c08a335802a36cb18c (diff)
downloadlinux-5434a04db905bb0af281cdb758d1357fbecd0fe8.tar.gz
watchdog: bcm47xx_wdt.c: convert to watchdog core api
Convert the bcm47xx_wdt.c driver to the new watchdog core api. The nowayout parameter is now added unconditionally to the module. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/Kconfig1
-rw-r--r--drivers/watchdog/bcm47xx_wdt.c152
2 files changed, 23 insertions, 130 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index beded63689d..f3aae8ccb6f 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -997,6 +997,7 @@ config ATH79_WDT
config BCM47XX_WDT
tristate "Broadcom BCM47xx Watchdog Timer"
depends on BCM47XX
+ select WATCHDOG_CORE
help
Hardware driver for the Broadcom BCM47xx Watchdog Timer.
diff --git a/drivers/watchdog/bcm47xx_wdt.c b/drivers/watchdog/bcm47xx_wdt.c
index bc0e91e78e8..4c520d68397 100644
--- a/drivers/watchdog/bcm47xx_wdt.c
+++ b/drivers/watchdog/bcm47xx_wdt.c
@@ -14,15 +14,12 @@
#include <linux/bitops.h>
#include <linux/errno.h>
-#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
-#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/reboot.h>
#include <linux/types.h>
-#include <linux/uaccess.h>
#include <linux/watchdog.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
@@ -41,15 +38,11 @@ module_param(wdt_time, int, 0);
MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
__MODULE_STRING(WDT_DEFAULT_TIME) ")");
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-#endif
-static unsigned long bcm47xx_wdt_busy;
-static char expect_release;
static struct timer_list wdt_timer;
static atomic_t ticks;
@@ -97,29 +90,31 @@ static void bcm47xx_timer_tick(unsigned long unused)
}
}
-static inline void bcm47xx_wdt_pet(void)
+static int bcm47xx_wdt_keepalive(struct watchdog_device *wdd)
{
atomic_set(&ticks, wdt_time);
+
+ return 0;
}
-static void bcm47xx_wdt_start(void)
+static int bcm47xx_wdt_start(struct watchdog_device *wdd)
{
bcm47xx_wdt_pet();
bcm47xx_timer_tick(0);
+
+ return 0;
}
-static void bcm47xx_wdt_pause(void)
+static int bcm47xx_wdt_stop(struct watchdog_device *wdd)
{
del_timer_sync(&wdt_timer);
bcm47xx_wdt_hw_stop();
-}
-static void bcm47xx_wdt_stop(void)
-{
- bcm47xx_wdt_pause();
+ return 0;
}
-static int bcm47xx_wdt_settimeout(int new_time)
+static int bcm47xx_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int new_time)
{
if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
return -EINVAL;
@@ -128,51 +123,6 @@ static int bcm47xx_wdt_settimeout(int new_time)
return 0;
}
-static int bcm47xx_wdt_open(struct inode *inode, struct file *file)
-{
- if (test_and_set_bit(0, &bcm47xx_wdt_busy))
- return -EBUSY;
-
- bcm47xx_wdt_start();
- return nonseekable_open(inode, file);
-}
-
-static int bcm47xx_wdt_release(struct inode *inode, struct file *file)
-{
- if (expect_release == 42) {
- bcm47xx_wdt_stop();
- } else {
- pr_crit("Unexpected close, not stopping watchdog!\n");
- bcm47xx_wdt_start();
- }
-
- clear_bit(0, &bcm47xx_wdt_busy);
- expect_release = 0;
- return 0;
-}
-
-static ssize_t bcm47xx_wdt_write(struct file *file, const char __user *data,
- size_t len, loff_t *ppos)
-{
- if (len) {
- if (!nowayout) {
- size_t i;
-
- expect_release = 0;
-
- for (i = 0; i != len; i++) {
- char c;
- if (get_user(c, data + i))
- return -EFAULT;
- if (c == 'V')
- expect_release = 42;
- }
- }
- bcm47xx_wdt_pet();
- }
- return len;
-}
-
static const struct watchdog_info bcm47xx_wdt_info = {
.identity = DRV_NAME,
.options = WDIOF_SETTIMEOUT |
@@ -180,80 +130,25 @@ static const struct watchdog_info bcm47xx_wdt_info = {
WDIOF_MAGICCLOSE,
};
-static long bcm47xx_wdt_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- int new_value, retval = -EINVAL;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &bcm47xx_wdt_info,
- sizeof(bcm47xx_wdt_info)) ? -EFAULT : 0;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_SETOPTIONS:
- if (get_user(new_value, p))
- return -EFAULT;
-
- if (new_value & WDIOS_DISABLECARD) {
- bcm47xx_wdt_stop();
- retval = 0;
- }
-
- if (new_value & WDIOS_ENABLECARD) {
- bcm47xx_wdt_start();
- retval = 0;
- }
-
- return retval;
-
- case WDIOC_KEEPALIVE:
- bcm47xx_wdt_pet();
- return 0;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_value, p))
- return -EFAULT;
-
- if (bcm47xx_wdt_settimeout(new_value))
- return -EINVAL;
-
- bcm47xx_wdt_pet();
-
- case WDIOC_GETTIMEOUT:
- return put_user(wdt_time, p);
-
- default:
- return -ENOTTY;
- }
-}
-
static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
- unsigned long code, void *unused)
+ unsigned long code, void *unused)
{
if (code == SYS_DOWN || code == SYS_HALT)
bcm47xx_wdt_stop();
return NOTIFY_DONE;
}
-static const struct file_operations bcm47xx_wdt_fops = {
+static struct watchdog_ops bcm47xx_wdt_ops = {
.owner = THIS_MODULE,
- .llseek = no_llseek,
- .unlocked_ioctl = bcm47xx_wdt_ioctl,
- .open = bcm47xx_wdt_open,
- .release = bcm47xx_wdt_release,
- .write = bcm47xx_wdt_write,
+ .start = bcm47xx_wdt_start,
+ .stop = bcm47xx_wdt_stop,
+ .ping = bcm47xx_wdt_keepalive,
+ .set_timeout = bcm47xx_wdt_set_timeout,
};
-static struct miscdevice bcm47xx_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &bcm47xx_wdt_fops,
+static struct watchdog_device bcm47xx_wdt_wdd = {
+ .info = &bcm47xx_wdt_info,
+ .ops = &bcm47xx_wdt_ops,
};
static struct notifier_block bcm47xx_wdt_notifier = {
@@ -274,12 +169,13 @@ static int __init bcm47xx_wdt_init(void)
pr_info("wdt_time value must be 0 < wdt_time < %d, using %d\n",
(WDT_MAX_TIME + 1), wdt_time);
}
+ watchdog_set_nowayout(&bcm47xx_wdt_wdd, nowayout);
ret = register_reboot_notifier(&bcm47xx_wdt_notifier);
if (ret)
return ret;
- ret = misc_register(&bcm47xx_wdt_miscdev);
+ ret = watchdog_register_device(&bcm47xx_wdt_wdd);
if (ret) {
unregister_reboot_notifier(&bcm47xx_wdt_notifier);
return ret;
@@ -292,10 +188,7 @@ static int __init bcm47xx_wdt_init(void)
static void __exit bcm47xx_wdt_exit(void)
{
- if (!nowayout)
- bcm47xx_wdt_stop();
-
- misc_deregister(&bcm47xx_wdt_miscdev);
+ watchdog_unregister_device(&bcm47xx_wdt_wdd);
unregister_reboot_notifier(&bcm47xx_wdt_notifier);
}
@@ -306,4 +199,3 @@ module_exit(bcm47xx_wdt_exit);
MODULE_AUTHOR("Aleksandar Radovanovic");
MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);