Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog

* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog: (21 commits)
  [WATCHDOG] at32ap700x_wdt.c - Fix compilation warnings
  [WATCHDOG] at32ap700x_wdt.c - Add spinlock support
  [WATCHDOG] at32ap700x_wdt.c - Add nowayout + MAGICCLOSE features
  [WATCHDOG] at32ap700x_wdt.c - timeout module parameter patch
  [WATCHDOG] at32ap700x_wdt.c - checkpatch.pl-0.05 clean-up's
  [WATCHDOG] change s3c2410_wdt to using dev_() macros for output
  [WATCHDOG] s3c2410_wdt announce initialisation
  [WATCHDOG] at32ap700x-wdt: add iounmap if probe function fails
  [WATCHDOG] at32ap700x-wdt: add missing iounmap in _remove
  [WATCHDOG] watchdog-driver-for-at32ap700x-devices-fix-2
  [WATCHDOG] watchdog-driver-for-at32ap700x-devices-fix
  [WATCHDOG] Watchdog driver for AT32AP700X devices
  [WATCHDOG] Mixcom Watchdog - CodingStyle clean-up
  [WATCHDOG] Mixcom Watchdog - clean-up printk's
  [WATCHDOG] Mixcom Watchdog - clean-up printk's
  [WATCHDOG] Mixcom Watchdog - checkcard part 2
  [WATCHDOG] Mixcom Watchdog - checkcard
  [WATCHDOG] Mixcom Watchdog - get rid of port offset's
  [WATCHDOG] Mixcom Watchdog - update "Documentation"
  [WATCHDOG] Remove the redundant check for pwrite() in EP93XXX watchdog.
  ...

drivers/char/watchdog/Kconfig

@@ -187,6 +187,15 @@ config PNX4008_WATCHDOG
 
 	  Say N if you are unsure.
 
+# AVR32 Architecture
+
+config AT32AP700X_WDT
+	tristate "AT32AP700x watchdog"
+	depends on WATCHDOG && CPU_AT32AP7000
+	help
+	  Watchdog timer embedded into AT32AP700x devices. This will reboot
+	  your system when the timeout is reached.
+
 # X86 (i386 + ia64 + x86_64) Architecture
 
 config ACQUIRE_WDT

drivers/char/watchdog/Makefile

@@ -36,6 +36,9 @@ obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o
 obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_wdt.o
 obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
 
+# AVR32 Architecture
+obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
+
 # X86 (i386 + ia64 + x86_64) Architecture
 obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
 obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o

drivers/char/watchdog/at32ap700x_wdt.c

+/*
+ * Watchdog driver for Atmel AT32AP700X devices
+ *
+ * Copyright (C) 2005-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+
+#define TIMEOUT_MIN		1
+#define TIMEOUT_MAX		2
+#define TIMEOUT_DEFAULT		TIMEOUT_MAX
+
+/* module parameters */
+static int timeout =  TIMEOUT_DEFAULT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+		"Timeout value. Limited to be 1 or 2 seconds. (default="
+		__MODULE_STRING(TIMEOUT_DEFAULT) ")");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/* Watchdog registers and write/read macro */
+#define WDT_CTRL		0x00
+#define WDT_CTRL_EN		   0
+#define WDT_CTRL_PSEL		   8
+#define WDT_CTRL_KEY		  24
+
+#define WDT_CLR			0x04
+
+#define WDT_BIT(name)		(1 << WDT_##name)
+#define WDT_BF(name, value)	((value) << WDT_##name)
+
+#define wdt_readl(dev, reg)				\
+	__raw_readl((dev)->regs + WDT_##reg)
+#define wdt_writel(dev, reg, value)			\
+	__raw_writel((value), (dev)->regs + WDT_##reg)
+
+struct wdt_at32ap700x {
+	void __iomem		*regs;
+	spinlock_t		io_lock;
+	int			timeout;
+	unsigned long		users;
+	struct miscdevice	miscdev;
+};
+
+static struct wdt_at32ap700x *wdt;
+static char expect_release;
+
+/*
+ * Disable the watchdog.
+ */
+static inline void at32_wdt_stop(void)
+{
+	unsigned long psel;
+
+	spin_lock(&wdt->io_lock);
+	psel = wdt_readl(wdt, CTRL) & WDT_BF(CTRL_PSEL, 0x0f);
+	wdt_writel(wdt, CTRL, psel | WDT_BF(CTRL_KEY, 0x55));
+	wdt_writel(wdt, CTRL, psel | WDT_BF(CTRL_KEY, 0xaa));
+	spin_unlock(&wdt->io_lock);
+}
+
+/*
+ * Enable and reset the watchdog.
+ */
+static inline void at32_wdt_start(void)
+{
+	/* 0xf is 2^16 divider = 2 sec, 0xe is 2^15 divider = 1 sec */
+	unsigned long psel = (wdt->timeout > 1) ? 0xf : 0xe;
+
+	spin_lock(&wdt->io_lock);
+	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
+			| WDT_BF(CTRL_PSEL, psel)
+			| WDT_BF(CTRL_KEY, 0x55));
+	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
+			| WDT_BF(CTRL_PSEL, psel)
+			| WDT_BF(CTRL_KEY, 0xaa));
+	spin_unlock(&wdt->io_lock);
+}
+
+/*
+ * Pat the watchdog timer.
+ */
+static inline void at32_wdt_pat(void)
+{
+	spin_lock(&wdt->io_lock);
+	wdt_writel(wdt, CLR, 0x42);
+	spin_unlock(&wdt->io_lock);
+}
+
+/*
+ * Watchdog device is opened, and watchdog starts running.
+ */
+static int at32_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(1, &wdt->users))
+		return -EBUSY;
+
+	at32_wdt_start();
+	return nonseekable_open(inode, file);
+}
+
+/*
+ * Close the watchdog device.
+ */
+static int at32_wdt_close(struct inode *inode, struct file *file)
+{
+	if (expect_release == 42) {
+		at32_wdt_stop();
+	} else {
+		dev_dbg(wdt->miscdev.parent,
+			"Unexpected close, not stopping watchdog!\n");
+		at32_wdt_pat();
+	}
+	clear_bit(1, &wdt->users);
+	expect_release = 0;
+	return 0;
+}
+
+/*
+ * Change the watchdog time interval.
+ */
+static int at32_wdt_settimeout(int time)
+{
+	/*
+	 * All counting occurs at 1 / SLOW_CLOCK (32 kHz) and max prescaler is
+	 * 2 ^ 16 allowing up to 2 seconds timeout.
+	 */
+	if ((time < TIMEOUT_MIN) || (time > TIMEOUT_MAX))
+		return -EINVAL;
+
+	/*
+	 * Set new watchdog time. It will be used when at32_wdt_start() is
+	 * called.
+	 */
+	wdt->timeout = time;
+	return 0;
+}
+
+static struct watchdog_info at32_wdt_info = {
+	.identity	= "at32ap700x watchdog",
+	.options	= WDIOF_SETTIMEOUT |
+			  WDIOF_KEEPALIVEPING |
+			  WDIOF_MAGICCLOSE,
+};
+
+/*
+ * Handle commands from user-space.
+ */
+static int at32_wdt_ioctl(struct inode *inode, struct file *file,
+		unsigned int cmd, unsigned long arg)
+{
+	int ret = -ENOTTY;
+	int time;
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+
+	switch (cmd) {
+	case WDIOC_KEEPALIVE:
+		at32_wdt_pat();
+		ret = 0;
+		break;
+	case WDIOC_GETSUPPORT:
+		ret = copy_to_user(argp, &at32_wdt_info,
+				sizeof(at32_wdt_info)) ? -EFAULT : 0;
+		break;
+	case WDIOC_SETTIMEOUT:
+		ret = get_user(time, p);
+		if (ret)
+			break;
+		ret = at32_wdt_settimeout(time);
+		if (ret)
+			break;
+		/* Enable new time value */
+		at32_wdt_start();
+		/* fall through */
+	case WDIOC_GETTIMEOUT:
+		ret = put_user(wdt->timeout, p);
+		break;
+	case WDIOC_GETSTATUS: /* fall through */
+	case WDIOC_GETBOOTSTATUS:
+		ret = put_user(0, p);
+		break;
+	case WDIOC_SETOPTIONS:
+		ret = get_user(time, p);
+		if (ret)
+			break;
+		if (time & WDIOS_DISABLECARD)
+			at32_wdt_stop();
+		if (time & WDIOS_ENABLECARD)
+			at32_wdt_start();
+		ret = 0;
+		break;
+	}
+
+	return ret;
+}
+
+static ssize_t at32_wdt_write(struct file *file, const char __user *data,
+				size_t len, loff_t *ppos)
+{
+	/* See if we got the magic character 'V' and reload the timer */
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			/*
+			 * note: just in case someone wrote the magic
+			 * character five months ago...
+			 */
+			expect_release = 0;
+
+			/*
+			 * scan to see whether or not we got the magic
+			 * character
+			 */
+			for (i = 0; i != len; i++) {
+				char c;
+				if (get_user(c, data+i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_release = 42;
+			}
+		}
+		/* someone wrote to us, we should pat the watchdog */
+		at32_wdt_pat();
+	}
+	return len;
+}
+
+static const struct file_operations at32_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.ioctl		= at32_wdt_ioctl,
+	.open		= at32_wdt_open,
+	.release	= at32_wdt_close,
+	.write		= at32_wdt_write,
+};
+
+static int __init at32_wdt_probe(struct platform_device *pdev)
+{
+	struct resource	*regs;
+	int ret;
+
+	if (wdt) {
+		dev_dbg(&pdev->dev, "only 1 wdt instance supported.\n");
+		return -EBUSY;
+	}
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!regs) {
+		dev_dbg(&pdev->dev, "missing mmio resource\n");
+		return -ENXIO;
+	}
+
+	wdt = kzalloc(sizeof(struct wdt_at32ap700x), GFP_KERNEL);
+	if (!wdt) {
+		dev_dbg(&pdev->dev, "no memory for wdt structure\n");
+		return -ENOMEM;
+	}
+
+	wdt->regs = ioremap(regs->start, regs->end - regs->start + 1);
+	if (!wdt->regs) {
+		ret = -ENOMEM;
+		dev_dbg(&pdev->dev, "could not map I/O memory\n");
+		goto err_free;
+	}
+	spin_lock_init(&wdt->io_lock);
+	wdt->users = 0;
+	wdt->miscdev.minor = WATCHDOG_MINOR;
+	wdt->miscdev.name = "watchdog";
+	wdt->miscdev.fops = &at32_wdt_fops;
+
+	if (at32_wdt_settimeout(timeout)) {
+		at32_wdt_settimeout(TIMEOUT_DEFAULT);
+		dev_dbg(&pdev->dev,
+			"default timeout invalid, set to %d sec.\n",
+			TIMEOUT_DEFAULT);
+	}
+
+	ret = misc_register(&wdt->miscdev);
+	if (ret) {
+		dev_dbg(&pdev->dev, "failed to register wdt miscdev\n");
+		goto err_iounmap;
+	}
+
+	platform_set_drvdata(pdev, wdt);
+	wdt->miscdev.parent = &pdev->dev;
+	dev_info(&pdev->dev,
+		"AT32AP700X WDT at 0x%p, timeout %d sec (nowayout=%d)\n",
+		wdt->regs, wdt->timeout, nowayout);
+
+	return 0;
+
+err_iounmap:
+	iounmap(wdt->regs);
+err_free:
+	kfree(wdt);
+	wdt = NULL;
+	return ret;
+}
+
+static int __exit at32_wdt_remove(struct platform_device *pdev)
+{
+	if (wdt && platform_get_drvdata(pdev) == wdt) {
+		/* Stop the timer before we leave */
+		if (!nowayout)
+			at32_wdt_stop();
+
+		misc_deregister(&wdt->miscdev);
+		iounmap(wdt->regs);
+		kfree(wdt);
+		wdt = NULL;
+		platform_set_drvdata(pdev, NULL);
+	}
+
+	return 0;
+}
+
+static void at32_wdt_shutdown(struct platform_device *pdev)
+{
+	at32_wdt_stop();
+}
+
+#ifdef CONFIG_PM
+static int at32_wdt_suspend(struct platform_device *pdev, pm_message_t message)
+{
+	at32_wdt_stop();
+	return 0;
+}
+
+static int at32_wdt_resume(struct platform_device *pdev)
+{
+	if (wdt->users)
+		at32_wdt_start();
+	return 0;
+}
+#else
+#define at32_wdt_suspend NULL
+#define at32_wdt_resume NULL
+#endif
+
+static struct platform_driver at32_wdt_driver = {
+	.remove		= __exit_p(at32_wdt_remove),
+	.suspend	= at32_wdt_suspend,
+	.resume		= at32_wdt_resume,
+	.driver		= {
+		.name	= "at32_wdt",
+		.owner	= THIS_MODULE,
+	},
+	.shutdown	= at32_wdt_shutdown,
+};
+
+static int __init at32_wdt_init(void)
+{
+	return platform_driver_probe(&at32_wdt_driver, at32_wdt_probe);
+}
+module_init(at32_wdt_init);
+
+static void __exit at32_wdt_exit(void)
+{
+	platform_driver_unregister(&at32_wdt_driver);
+}
+module_exit(at32_wdt_exit);
+
+MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
+MODULE_DESCRIPTION("Watchdog driver for Atmel AT32AP700X");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/ep93xx_wdt.c

@@ -107,10 +107,6 @@ static ssize_t
 ep93xx_wdt_write(struct file *file, const char __user *data, size_t len,
 		 loff_t *ppos)
 {
-	/* Can't seek (pwrite) on this device */
-	if (*ppos != file->f_pos)
-		return -ESPIPE;
-
 	if (len) {
 		if (!nowayout) {
 			size_t i;

drivers/char/watchdog/mixcomwd.c

@@ -31,9 +31,16 @@
  * Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>
  *		- added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
  *
+ * Version 0.6 (2002/04/12): Rob Radez <rob@osinvestor.com>
+ *		- make mixcomwd_opened unsigned,
+ *		  removed lock_kernel/unlock_kernel from mixcomwd_release,
+ *		  modified ioctl a bit to conform to API
+ *
  */
 
-#define VERSION "0.5"
+#define VERSION "0.6"
+#define WATCHDOG_NAME "mixcomwd"
+#define PFX WATCHDOG_NAME ": "
 
 #include <linux/module.h>
 #include <linux/moduleparam.h>
@@ -49,12 +56,46 @@
 #include <asm/uaccess.h>
 #include <asm/io.h>
 
-static int mixcomwd_ioports[] = { 0x180, 0x280, 0x380, 0x000 };
-
-#define MIXCOM_WATCHDOG_OFFSET 0xc10
+/*
+ * We have two types of cards that can be probed:
+ * 1) The Mixcom cards: these cards can be found at addresses
+ *    0x180, 0x280, 0x380 with an additional offset of 0xc10.
+ *    (Or 0xd90, 0xe90, 0xf90).
+ * 2) The FlashCOM cards: these cards can be set up at
+ *    0x300 -> 0x378, in 0x8 jumps with an offset of 0x04.
+ *    (Or 0x304 -> 0x37c in 0x8 jumps).
+ *    Each card has it's own ID.
+ */
 #define MIXCOM_ID 0x11
-#define FLASHCOM_WATCHDOG_OFFSET 0x4
 #define FLASHCOM_ID 0x18
+static struct {
+	int ioport;
+	int id;
+} mixcomwd_io_info[] __devinitdata = {
+	/* The Mixcom cards */
+	{0x0d90, MIXCOM_ID},
+	{0x0e90, MIXCOM_ID},
+	{0x0f90, MIXCOM_ID},
+	/* The FlashCOM cards */
+	{0x0304, FLASHCOM_ID},
+	{0x030c, FLASHCOM_ID},
+	{0x0314, FLASHCOM_ID},
+	{0x031c, FLASHCOM_ID},
+	{0x0324, FLASHCOM_ID},
+	{0x032c, FLASHCOM_ID},
+	{0x0334, FLASHCOM_ID},
+	{0x033c, FLASHCOM_ID},
+	{0x0344, FLASHCOM_ID},
+	{0x034c, FLASHCOM_ID},
+	{0x0354, FLASHCOM_ID},
+	{0x035c, FLASHCOM_ID},
+	{0x0364, FLASHCOM_ID},
+	{0x036c, FLASHCOM_ID},
+	{0x0374, FLASHCOM_ID},
+	{0x037c, FLASHCOM_ID},
+	/* The end of the list */
+	{0x0000, 0},
+};
 
 static void mixcomwd_timerfun(unsigned long d);
 
@@ -113,13 +154,13 @@ static int mixcomwd_release(struct inode *inode, struct file *file)
 {
 	if (expect_close == 42) {
 		if(mixcomwd_timer_alive) {
-			printk(KERN_ERR "mixcomwd: release called while internal timer alive");
+			printk(KERN_ERR PFX "release called while internal timer alive");
 			return -EBUSY;
 		}
 		mixcomwd_timer_alive=1;
 		mod_timer(&mixcomwd_timer, jiffies + 5 * HZ);
 	} else {
-		printk(KERN_CRIT "mixcomwd: WDT device closed unexpectedly.  WDT will not stop!\n");
+		printk(KERN_CRIT PFX "WDT device closed unexpectedly.  WDT will not stop!\n");
 	}
 
 	clear_bit(0,&mixcomwd_opened);
@@ -188,8 +229,7 @@ static int mixcomwd_ioctl(struct inode *inode, struct file *file,
 	return 0;
 }
 
-static const struct file_operations mixcomwd_fops=
-{
+static const struct file_operations mixcomwd_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
 	.write		= mixcomwd_write,
@@ -198,46 +238,30 @@ static const struct file_operations mixcomwd_fops=
 	.release	= mixcomwd_release,
 };
 
-static struct miscdevice mixcomwd_miscdev=
-{
+static struct miscdevice mixcomwd_miscdev = {
 	.minor	= WATCHDOG_MINOR,
 	.name	= "watchdog",
 	.fops	= &mixcomwd_fops,
 };
 
-static int __init mixcomwd_checkcard(int port)
-{
-	int id;
-
-	port += MIXCOM_WATCHDOG_OFFSET;
-	if (!request_region(port, 1, "MixCOM watchdog")) {
-		return 0;
-	}
-
-	id=inb_p(port) & 0x3f;
-	if(id!=MIXCOM_ID) {
-		release_region(port, 1);
-		return 0;
-	}
-	return port;
-}
-
-static int __init flashcom_checkcard(int port)
+static int __init checkcard(int port, int card_id)
 {
 	int id;
 
-	port += FLASHCOM_WATCHDOG_OFFSET;
 	if (!request_region(port, 1, "MixCOM watchdog")) {
 		return 0;
 	}
 
 	id=inb_p(port);
- 	if(id!=FLASHCOM_ID) {
+	if (card_id==MIXCOM_ID)
+		id &= 0x3f;
+
+	if (id!=card_id) {
 		release_region(port, 1);
 		return 0;
 	}
- 	return port;
- }
+	return 1;
+}
 
 static int __init mixcomwd_init(void)
 {
@@ -245,50 +269,50 @@ static int __init mixcomwd_init(void)
 	int ret;
 	int found=0;
 
-	for (i = 0; !found && mixcomwd_ioports[i] != 0; i++) {
-		watchdog_port = mixcomwd_checkcard(mixcomwd_ioports[i]);
-		if (watchdog_port) {
-			found = 1;
-		}
-	}
-
-	/* The FlashCOM card can be set up at 0x300 -> 0x378, in 0x8 jumps */
-	for (i = 0x300; !found && i < 0x380; i+=0x8) {
-		watchdog_port = flashcom_checkcard(i);
-		if (watchdog_port) {
+	for (i = 0; !found && mixcomwd_io_info[i].ioport != 0; i++) {
+		if (checkcard(mixcomwd_io_info[i].ioport,
+			      mixcomwd_io_info[i].id)) {
 			found = 1;
+			watchdog_port = mixcomwd_io_info[i].ioport;
 		}
 	}
 
 	if (!found) {
-		printk("mixcomwd: No card detected, or port not available.\n");
+		printk(KERN_ERR PFX "No card detected, or port not available.\n");
 		return -ENODEV;
 	}
 
 	ret = misc_register(&mixcomwd_miscdev);
 	if (ret)
 	{
-		release_region(watchdog_port, 1);
-		return ret;
+		printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, ret);
+		goto error_misc_register_watchdog;
 	}
 
-	printk(KERN_INFO "MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",VERSION,watchdog_port);
+	printk(KERN_INFO "MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",
+		VERSION, watchdog_port);
 
 	return 0;
+
+error_misc_register_watchdog:
+	release_region(watchdog_port, 1);
+	watchdog_port = 0x0000;
+	return ret;
 }
 
 static void __exit mixcomwd_exit(void)
 {
 	if (!nowayout) {
 		if(mixcomwd_timer_alive) {
-			printk(KERN_WARNING "mixcomwd: I quit now, hardware will"
+			printk(KERN_WARNING PFX "I quit now, hardware will"
 			       " probably reboot!\n");
 			del_timer_sync(&mixcomwd_timer);
 			mixcomwd_timer_alive=0;
 		}
 	}
-	release_region(watchdog_port,1);
 	misc_deregister(&mixcomwd_miscdev);
+	release_region(watchdog_port,1);
 }
 
 module_init(mixcomwd_init);
@@ -296,5 +320,6 @@ module_exit(mixcomwd_exit);
 
 MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>");
 MODULE_DESCRIPTION("MixCom Watchdog driver");
+MODULE_VERSION(VERSION);
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/pnx4008_wdt.c

@@ -148,10 +148,6 @@ static ssize_t
 pnx4008_wdt_write(struct file *file, const char *data, size_t len,
 		  loff_t * ppos)
 {
-	/*  Can't seek (pwrite) on this device  */
-	if (ppos != &file->f_pos)
-		return -ESPIPE;
-
 	if (len) {
 		if (!nowayout) {
 			size_t i;

drivers/char/watchdog/s3c2410_wdt.c

@@ -92,6 +92,7 @@ typedef enum close_state {
 
 static DECLARE_MUTEX(open_lock);
 
+static struct device    *wdt_dev;	/* platform device attached to */
 static struct resource	*wdt_mem;
 static struct resource	*wdt_irq;
 static struct clk	*wdt_clock;
@@ -180,7 +181,7 @@ static int s3c2410wdt_set_heartbeat(int timeout)
 		}
 
 		if ((count / divisor) >= 0x10000) {
-			printk(KERN_ERR PFX "timeout %d too big\n", timeout);
+			dev_err(wdt_dev, "timeout %d too big\n", timeout);
 			return -EINVAL;
 		}
 	}
@@ -233,7 +234,7 @@ static int s3c2410wdt_release(struct inode *inode, struct file *file)
 	if (allow_close == CLOSE_STATE_ALLOW) {
 		s3c2410wdt_stop();
 	} else {
-		printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+		dev_err(wdt_dev, "Unexpected close, not stopping watchdog\n");
 		s3c2410wdt_keepalive();
 	}
 
@@ -338,7 +339,7 @@ static struct miscdevice s3c2410wdt_miscdev = {
 
 static irqreturn_t s3c2410wdt_irq(int irqno, void *param)
 {
-	printk(KERN_INFO PFX "Watchdog timer expired!\n");
+	dev_info(wdt_dev, "watchdog timer expired (irq)\n");
 
 	s3c2410wdt_keepalive();
 	return IRQ_HANDLED;
@@ -348,31 +349,36 @@ static irqreturn_t s3c2410wdt_irq(int irqno, void *param)
 static int s3c2410wdt_probe(struct platform_device *pdev)
 {
 	struct resource *res;
+	struct device *dev;
+	unsigned int wtcon;
 	int started = 0;
 	int ret;
 	int size;
 
 	DBG("%s: probe=%p\n", __FUNCTION__, pdev);
 
+	dev = &pdev->dev;
+	wdt_dev = &pdev->dev;
+
 	/* get the memory region for the watchdog timer */
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res == NULL) {
-		printk(KERN_INFO PFX "failed to get memory region resouce\n");
+		dev_err(dev, "no memory resource specified\n");
 		return -ENOENT;
 	}
 
 	size = (res->end-res->start)+1;
 	wdt_mem = request_mem_region(res->start, size, pdev->name);
 	if (wdt_mem == NULL) {
-		printk(KERN_INFO PFX "failed to get memory region\n");
+		dev_err(dev, "failed to get memory region\n");
 		ret = -ENOENT;
 		goto err_req;
 	}
 
 	wdt_base = ioremap(res->start, size);
 	if (wdt_base == 0) {
-		printk(KERN_INFO PFX "failed to ioremap() region\n");
+		dev_err(dev, "failed to ioremap() region\n");
 		ret = -EINVAL;
 		goto err_req;
 	}
@@ -381,20 +387,20 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 
 	wdt_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (wdt_irq == NULL) {
-		printk(KERN_INFO PFX "failed to get irq resource\n");
+		dev_err(dev, "no irq resource specified\n");
 		ret = -ENOENT;
 		goto err_map;
 	}
 
 	ret = request_irq(wdt_irq->start, s3c2410wdt_irq, 0, pdev->name, pdev);
 	if (ret != 0) {
-		printk(KERN_INFO PFX "failed to install irq (%d)\n", ret);
+		dev_err(dev, "failed to install irq (%d)\n", ret);
 		goto err_map;
 	}
 
 	wdt_clock = clk_get(&pdev->dev, "watchdog");
 	if (IS_ERR(wdt_clock)) {
-		printk(KERN_INFO PFX "failed to find watchdog clock source\n");
+		dev_err(dev, "failed to find watchdog clock source\n");
 		ret = PTR_ERR(wdt_clock);
 		goto err_irq;
 	}
@@ -408,22 +414,22 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 		started = s3c2410wdt_set_heartbeat(CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME);
 
 		if (started == 0) {
-			printk(KERN_INFO PFX "tmr_margin value out of range, default %d used\n",
+			dev_info(dev,"tmr_margin value out of range, default %d used\n",
 			       CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME);
 		} else {
-			printk(KERN_INFO PFX "default timer value is out of range, cannot start\n");
+			dev_info(dev, "default timer value is out of range, cannot start\n");
 		}
 	}
 
 	ret = misc_register(&s3c2410wdt_miscdev);
 	if (ret) {
-		printk (KERN_ERR PFX "cannot register miscdev on minor=%d (%d)\n",
+		dev_err(dev, "cannot register miscdev on minor=%d (%d)\n",
 			WATCHDOG_MINOR, ret);
 		goto err_clk;
 	}
 
 	if (tmr_atboot && started == 0) {
-		printk(KERN_INFO PFX "Starting Watchdog Timer\n");
+		dev_info(dev, "starting watchdog timer\n");
 		s3c2410wdt_start();
 	} else if (!tmr_atboot) {
 		/* if we're not enabling the watchdog, then ensure it is
@@ -433,6 +439,15 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 		s3c2410wdt_stop();
 	}
 
+	/* print out a statement of readiness */
+
+	wtcon = readl(wdt_base + S3C2410_WTCON);
+
+	dev_info(dev, "watchdog %sactive, reset %sabled, irq %sabled\n",
+		 (wtcon & S3C2410_WTCON_ENABLE) ?  "" : "in",
+		 (wtcon & S3C2410_WTCON_RSTEN) ? "" : "dis",
+		 (wtcon & S3C2410_WTCON_INTEN) ? "" : "en");
+	
 	return 0;
 
  err_clk: