1 files changed, 55 insertions, 32 deletions

diff --git a/drivers/char/watchdog/s3c2410_wdt.c b/drivers/char/watchdog/s3c2410_wdt.c
index f85ac898a49a..8b292bf343c4 100644
--- a/drivers/char/watchdog/s3c2410_wdt.c
+++ b/drivers/char/watchdog/s3c2410_wdt.c
@@ -27,7 +27,10 @@
  *                              Fixed tmr_count / wdt_count confusion
  *                              Added configurable debug
  *
- *      11-Jan-2004     BJD     Fixed divide-by-2 in timeout code
+ *      11-Jan-2005     BJD     Fixed divide-by-2 in timeout code
+ *
+ *      25-Jan-2005     DA      Added suspend/resume support
+ *                              Replaced reboot notifier with .shutdown method
  *
  *      10-Mar-2005     LCVR    Changed S3C2410_VA to S3C24XX_VA
 */
@@ -40,8 +43,6 @@
 #include <linux/miscdevice.h>
 #include <linux/watchdog.h>
 #include <linux/fs.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
@@ -317,20 +318,6 @@ static int s3c2410wdt_ioctl(struct inode *inode, struct file *file,
         }
 }
 
-/*
- *      Notifier for system down
- */
-
-static int s3c2410wdt_notify_sys(struct notifier_block *this, unsigned long code,
-                              void *unused)
-{
-        if(code==SYS_DOWN || code==SYS_HALT) {
-                /* Turn the WDT off */
-                s3c2410wdt_stop();
-        }
-        return NOTIFY_DONE;
-}
-
 /* kernel interface */
 
 static struct file_operations s3c2410wdt_fops = {
@@ -348,10 +335,6 @@ static struct miscdevice s3c2410wdt_miscdev = {
         .fops           = &s3c2410wdt_fops,
 };
 
-static struct notifier_block s3c2410wdt_notifier = {
-        .notifier_call  = s3c2410wdt_notify_sys,
-};
-
 /* interrupt handler code */
 
 static irqreturn_t s3c2410wdt_irq(int irqno, void *param,
@@ -432,18 +415,10 @@ static int s3c2410wdt_probe(struct device *dev)
                 }
         }
 
-        ret = register_reboot_notifier(&s3c2410wdt_notifier);
-        if (ret) {
-                printk (KERN_ERR PFX "cannot register reboot notifier (%d)\n",
-                        ret);
-                return ret;
-        }
-
         ret = misc_register(&s3c2410wdt_miscdev);
         if (ret) {
                 printk (KERN_ERR PFX "cannot register miscdev on minor=%d (%d)\n",
                         WATCHDOG_MINOR, ret);
-                unregister_reboot_notifier(&s3c2410wdt_notifier);
                 return ret;
         }
 
@@ -479,15 +454,63 @@ static int s3c2410wdt_remove(struct device *dev)
         return 0;
 }
 
+static void s3c2410wdt_shutdown(struct device *dev)
+{
+        s3c2410wdt_stop();      
+}
+
+#ifdef CONFIG_PM
+
+static unsigned long wtcon_save;
+static unsigned long wtdat_save;
+
+static int s3c2410wdt_suspend(struct device *dev, u32 state, u32 level)
+{
+        if (level == SUSPEND_POWER_DOWN) {
+                /* Save watchdog state, and turn it off. */
+                wtcon_save = readl(wdt_base + S3C2410_WTCON);
+                wtdat_save = readl(wdt_base + S3C2410_WTDAT);
+
+                /* Note that WTCNT doesn't need to be saved. */
+                s3c2410wdt_stop();
+        }
+
+        return 0;
+}
+
+static int s3c2410wdt_resume(struct device *dev, u32 level)
+{
+        if (level == RESUME_POWER_ON) {
+                /* Restore watchdog state. */
+
+                writel(wtdat_save, wdt_base + S3C2410_WTDAT);
+                writel(wtdat_save, wdt_base + S3C2410_WTCNT); /* Reset count */
+                writel(wtcon_save, wdt_base + S3C2410_WTCON);
+
+                printk(KERN_INFO PFX "watchdog %sabled\n",
+                       (wtcon_save & S3C2410_WTCON_ENABLE) ? "en" : "dis");
+        }
+
+        return 0;
+}
+
+#else
+#define s3c2410wdt_suspend NULL
+#define s3c2410wdt_resume  NULL
+#endif /* CONFIG_PM */
+
+
 static struct device_driver s3c2410wdt_driver = {
         .name           = "s3c2410-wdt",
         .bus            = &platform_bus_type,
         .probe          = s3c2410wdt_probe,
         .remove         = s3c2410wdt_remove,
+        .shutdown       = s3c2410wdt_shutdown,
+        .suspend        = s3c2410wdt_suspend,
+        .resume         = s3c2410wdt_resume,
 };
 
 
-
 static char banner[] __initdata = KERN_INFO "S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics\n";
 
 static int __init watchdog_init(void)
@@ -499,13 +522,13 @@ static int __init watchdog_init(void)
 static void __exit watchdog_exit(void)
 {
         driver_unregister(&s3c2410wdt_driver);
-        unregister_reboot_notifier(&s3c2410wdt_notifier);
 }
 
 module_init(watchdog_init);
 module_exit(watchdog_exit);
 
-MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, "
+              "Dimitry Andric <dimitry.andric@tomtom.com>");
 MODULE_DESCRIPTION("S3C2410 Watchdog Device Driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);