diff options
Diffstat (limited to 'drivers/watchdog/bcm47xx_wdt.c')
| -rw-r--r-- | drivers/watchdog/bcm47xx_wdt.c | 152 |
1 files changed, 22 insertions, 130 deletions
diff --git a/drivers/watchdog/bcm47xx_wdt.c b/drivers/watchdog/bcm47xx_wdt.c index bc0e91e78e86..4c520d68397e 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); |