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>

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);