Merge commit 'watchdog/master'

drivers/watchdog/Kconfig

@@ -55,6 +55,13 @@ config SOFT_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called softdog.
 
+config WM831X_WATCHDOG
+	tristate "WM831x watchdog"
+	depends on MFD_WM831X
+	help
+	  Support for the watchdog in the WM831x AudioPlus PMICs.  When
+	  the watchdog triggers the system will be reset.
+
 config WM8350_WATCHDOG
 	tristate "WM8350 watchdog"
 	depends on MFD_WM8350
@@ -266,6 +273,15 @@ config STMP3XXX_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called stmp3xxx_wdt.
 
+config NUC900_WATCHDOG
+	tristate "Nuvoton NUC900 watchdog"
+	depends on ARCH_W90X900
+	help
+	  Say Y here if to include support for the watchdog timer
+	  for the Nuvoton NUC900 series SoCs.
+	  To compile this driver as a module, choose M here: the
+	  module will be called nuc900_wdt.
+
 # AVR32 Architecture
 
 config AT32AP700X_WDT
@@ -369,6 +385,28 @@ config SC520_WDT
 	  You can compile this driver directly into the kernel, or use
 	  it as a module.  The module will be called sc520_wdt.
 
+config SBC_FITPC2_WATCHDOG
+	tristate "Compulab SBC-FITPC2 watchdog"
+	depends on X86
+	---help---
+	  This is the driver for the built-in watchdog timer on the fit-PC2
+	  Single-board computer made by Compulab.
+
+	  It`s possible to enable watchdog timer either from BIOS (F2) or from booted Linux.
+	  When "Watchdog Timer Value" enabled one can set 31-255 s operational range.
+
+	  Entering BIOS setup temporary disables watchdog operation regardless to current state,
+	  so system will not be restarted while user in BIOS setup.
+
+	  Once watchdog was enabled the system will be restarted every
+	  "Watchdog Timer Value" period, so to prevent it user can restart or
+	  disable the watchdog.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called sbc_fitpc2_wdt.
+
+	  Most people will say N.
+
 config EUROTECH_WDT
 	tristate "Eurotech CPU-1220/1410 Watchdog Timer"
 	depends on X86

drivers/watchdog/Makefile

@@ -44,6 +44,7 @@ obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
 obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
 obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
 obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
+obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
 
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
@@ -64,6 +65,7 @@ obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
 obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
 obj-$(CONFIG_GEODE_WDT) += geodewdt.o
 obj-$(CONFIG_SC520_WDT) += sc520_wdt.o
+obj-$(CONFIG_SBC_FITPC2_WATCHDOG) += sbc_fitpc2_wdt.o
 obj-$(CONFIG_EUROTECH_WDT) += eurotechwdt.o
 obj-$(CONFIG_IB700_WDT) += ib700wdt.o
 obj-$(CONFIG_IBMASR) += ibmasr.o
@@ -139,5 +141,6 @@ obj-$(CONFIG_WATCHDOG_CP1XXX)		+= cpwd.o
 # XTENSA Architecture
 
 # Architecture Independant
+obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
 obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
 obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o

drivers/watchdog/ar7_wdt.c

@@ -28,9 +28,8 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/miscdevice.h>
+#include <linux/platform_device.h>
 #include <linux/watchdog.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
 #include <linux/fs.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
@@ -76,24 +75,10 @@ static unsigned expect_close;
 /* XXX currently fixed, allows max margin ~68.72 secs */
 #define prescale_value 0xffff
 
-/* Offset of the WDT registers */
-static unsigned long ar7_regs_wdt;
+/* Resource of the WDT registers */
+static struct resource *ar7_regs_wdt;
 /* Pointer to the remapped WDT IO space */
 static struct ar7_wdt *ar7_wdt;
-static void ar7_wdt_get_regs(void)
-{
-	u16 chip_id = ar7_chip_id();
-	switch (chip_id) {
-	case AR7_CHIP_7100:
-	case AR7_CHIP_7200:
-		ar7_regs_wdt = AR7_REGS_WDT;
-		break;
-	default:
-		ar7_regs_wdt = UR8_REGS_WDT;
-		break;
-	}
-}
-
 
 static void ar7_wdt_kick(u32 value)
 {
@@ -202,20 +187,6 @@ static int ar7_wdt_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
-static int ar7_wdt_notify_sys(struct notifier_block *this,
-			      unsigned long code, void *unused)
-{
-	if (code == SYS_HALT || code == SYS_POWER_OFF)
-		if (!nowayout)
-			ar7_wdt_disable_wdt();
-
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block ar7_wdt_notifier = {
-	.notifier_call = ar7_wdt_notify_sys,
-};
-
 static ssize_t ar7_wdt_write(struct file *file, const char *data,
 			     size_t len, loff_t *ppos)
 {
@@ -299,56 +270,86 @@ static struct miscdevice ar7_wdt_miscdev = {
 	.fops		= &ar7_wdt_fops,
 };
 
-static int __init ar7_wdt_init(void)
+static int __devinit ar7_wdt_probe(struct platform_device *pdev)
 {
 	int rc;
 
 	spin_lock_init(&wdt_lock);
 
-	ar7_wdt_get_regs();
+	ar7_regs_wdt =
+		platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+	if (!ar7_regs_wdt) {
+		printk(KERN_ERR DRVNAME ": could not get registers resource\n");
+		rc = -ENODEV;
+		goto out;
+	}
 
-	if (!request_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt),
-							LONGNAME)) {
+	if (!request_mem_region(ar7_regs_wdt->start,
+				resource_size(ar7_regs_wdt), LONGNAME)) {
 		printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
-		return -EBUSY;
+		rc = -EBUSY;
+		goto out;
 	}
 
-	ar7_wdt = (struct ar7_wdt *)
-			ioremap(ar7_regs_wdt, sizeof(struct ar7_wdt));
+	ar7_wdt = ioremap(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
+	if (!ar7_wdt) {
+		printk(KERN_ERR DRVNAME ": could not ioremap registers\n");
+		rc = -ENXIO;
+		goto out_mem_region;
+	}
 
 	ar7_wdt_disable_wdt();
 	ar7_wdt_prescale(prescale_value);
 	ar7_wdt_update_margin(margin);
 
-	rc = register_reboot_notifier(&ar7_wdt_notifier);
-	if (rc) {
-		printk(KERN_ERR DRVNAME
-			": unable to register reboot notifier\n");
-		goto out_alloc;
-	}
-
 	rc = misc_register(&ar7_wdt_miscdev);
 	if (rc) {
 		printk(KERN_ERR DRVNAME ": unable to register misc device\n");
-		goto out_register;
+		goto out_alloc;
 	}
 	goto out;
 
-out_register:
-	unregister_reboot_notifier(&ar7_wdt_notifier);
 out_alloc:
 	iounmap(ar7_wdt);
-	release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
+out_mem_region:
+	release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
 out:
 	return rc;
 }
 
-static void __exit ar7_wdt_cleanup(void)
+static int __devexit ar7_wdt_remove(struct platform_device *pdev)
 {
 	misc_deregister(&ar7_wdt_miscdev);
-	unregister_reboot_notifier(&ar7_wdt_notifier);
 	iounmap(ar7_wdt);
-	release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
+	release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
+
+	return 0;
+}
+
+static void ar7_wdt_shutdown(struct platform_device *pdev)
+{
+	if (!nowayout)
+		ar7_wdt_disable_wdt();
+}
+
+static struct platform_driver ar7_wdt_driver = {
+	.probe = ar7_wdt_probe,
+	.remove = __devexit_p(ar7_wdt_remove),
+	.shutdown = ar7_wdt_shutdown,
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "ar7_wdt",
+	},
+};
+
+static int __init ar7_wdt_init(void)
+{
+	return platform_driver_register(&ar7_wdt_driver);
+}
+
+static void __exit ar7_wdt_cleanup(void)
+{
+	platform_driver_unregister(&ar7_wdt_driver);
 }
 
 module_init(ar7_wdt_init);

drivers/watchdog/booke_wdt.c

@@ -22,6 +22,8 @@
 
 #include <asm/reg_booke.h>
 #include <asm/system.h>
+#include <asm/time.h>
+#include <asm/div64.h>
 
 /* If the kernel parameter wdt=1, the watchdog will be enabled at boot.
  * Also, the wdt_period sets the watchdog timer period timeout.
@@ -32,7 +34,7 @@
  */
 
 #ifdef	CONFIG_FSL_BOOKE
-#define WDT_PERIOD_DEFAULT 63	/* Ex. wdt_period=28 bus=333Mhz,reset=~40sec */
+#define WDT_PERIOD_DEFAULT 38	/* Ex. wdt_period=28 bus=333Mhz,reset=~40sec */
 #else
 #define WDT_PERIOD_DEFAULT 3	/* Refer to the PPC40x and PPC4xx manuals */
 #endif				/* for timing information */
@@ -41,7 +43,7 @@ u32 booke_wdt_enabled;
 u32 booke_wdt_period = WDT_PERIOD_DEFAULT;
 
 #ifdef	CONFIG_FSL_BOOKE
-#define WDTP(x)		((((63-x)&0x3)<<30)|(((63-x)&0x3c)<<15))
+#define WDTP(x)		((((x)&0x3)<<30)|(((x)&0x3c)<<15))
 #define WDTP_MASK	(WDTP(0))
 #else
 #define WDTP(x)		(TCR_WP(x))
@@ -50,6 +52,45 @@ u32 booke_wdt_period = WDT_PERIOD_DEFAULT;
 
 static DEFINE_SPINLOCK(booke_wdt_lock);
 
+/* For the specified period, determine the number of seconds
+ * corresponding to the reset time.  There will be a watchdog
+ * exception at approximately 3/5 of this time.
+ *
+ * The formula to calculate this is given by:
+ * 2.5 * (2^(63-period+1)) / timebase_freq
+ *
+ * In order to simplify things, we assume that period is
+ * at least 1.  This will still result in a very long timeout.
+ */
+static unsigned long long period_to_sec(unsigned int period)
+{
+	unsigned long long tmp = 1ULL << (64 - period);
+	unsigned long tmp2 = ppc_tb_freq;
+
+	/* tmp may be a very large number and we don't want to overflow,
+	 * so divide the timebase freq instead of multiplying tmp
+	 */
+	tmp2 = tmp2 / 5 * 2;
+
+	do_div(tmp, tmp2);
+	return tmp;
+}
+
+/*
+ * This procedure will find the highest period which will give a timeout
+ * greater than the one required. e.g. for a bus speed of 66666666 and
+ * and a parameter of 2 secs, then this procedure will return a value of 38.
+ */
+static unsigned int sec_to_period(unsigned int secs)
+{
+	unsigned int period;
+	for (period = 63; period > 0; period--) {
+		if (period_to_sec(period) >= secs)
+			return period;
+	}
+	return 0;
+}
+
 static void __booke_wdt_ping(void *data)
 {
 	mtspr(SPRN_TSR, TSR_ENW|TSR_WIS);
@@ -93,7 +134,7 @@ static long booke_wdt_ioctl(struct file *file,
 
 	switch (cmd) {
 	case WDIOC_GETSUPPORT:
-		if (copy_to_user(arg, &ident, sizeof(struct watchdog_info)))
+		if (copy_to_user((void *)arg, &ident, sizeof(ident)))
 			return -EFAULT;
 	case WDIOC_GETSTATUS:
 		return put_user(ident.options, p);
@@ -115,8 +156,16 @@ static long booke_wdt_ioctl(struct file *file,
 		booke_wdt_ping();
 		return 0;
 	case WDIOC_SETTIMEOUT:
-		if (get_user(booke_wdt_period, p))
+		if (get_user(tmp, p))
 			return -EFAULT;
+#ifdef	CONFIG_FSL_BOOKE
+		/* period of 1 gives the largest possible timeout */
+		if (tmp > period_to_sec(1))
+			return -EINVAL;
+		booke_wdt_period = sec_to_period(tmp);
+#else
+		booke_wdt_period = tmp;
+#endif
 		mtspr(SPRN_TCR, (mfspr(SPRN_TCR) & ~WDTP_MASK) |
 						WDTP(booke_wdt_period));
 		return 0;

drivers/watchdog/coh901327_wdt.c

@@ -110,7 +110,7 @@ static void coh901327_enable(u16 timeout)
 	 * Wait 3 32 kHz cycles for it to take effect
 	 */
 	freq = clk_get_rate(clk);
-	delay_ns = (1000000000 + freq - 1) / freq; /* Freq to ns and round up */
+	delay_ns = DIV_ROUND_UP(1000000000, freq); /* Freq to ns and round up */
 	delay_ns = 3 * delay_ns; /* Wait 3 cycles */
 	ndelay(delay_ns);
 	/* Enable the watchdog interrupt */

drivers/watchdog/davinci_wdt.c

@@ -25,6 +25,7 @@
 #include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/device.h>
+#include <linux/clk.h>
 
 #define MODULE_NAME "DAVINCI-WDT: "
 
@@ -69,6 +70,7 @@ static unsigned long wdt_status;
 
 static struct resource	*wdt_mem;
 static void __iomem	*wdt_base;
+struct clk		*wdt_clk;
 
 static void wdt_service(void)
 {
@@ -86,6 +88,9 @@ static void wdt_enable(void)
 {
 	u32 tgcr;
 	u32 timer_margin;
+	unsigned long wdt_freq;
+
+	wdt_freq = clk_get_rate(wdt_clk);
 
 	spin_lock(&io_lock);
 
@@ -99,9 +104,9 @@ static void wdt_enable(void)
 	iowrite32(0, wdt_base + TIM12);
 	iowrite32(0, wdt_base + TIM34);
 	/* set timeout period */
-	timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) & 0xffffffff);
+	timer_margin = (((u64)heartbeat * wdt_freq) & 0xffffffff);
 	iowrite32(timer_margin, wdt_base + PRD12);
-	timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) >> 32);
+	timer_margin = (((u64)heartbeat * wdt_freq) >> 32);
 	iowrite32(timer_margin, wdt_base + PRD34);
 	/* enable run continuously */
 	iowrite32(ENAMODE12_PERIODIC, wdt_base + TCR);
@@ -199,6 +204,12 @@ static int __devinit davinci_wdt_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct device *dev = &pdev->dev;
 
+	wdt_clk = clk_get(dev, NULL);
+	if (WARN_ON(IS_ERR(wdt_clk)))
+		return PTR_ERR(wdt_clk);
+
+	clk_enable(wdt_clk);
+
 	if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
 		heartbeat = DEFAULT_HEARTBEAT;
 
@@ -245,6 +256,10 @@ static int __devexit davinci_wdt_remove(struct platform_device *pdev)
 		kfree(wdt_mem);
 		wdt_mem = NULL;
 	}
+
+	clk_disable(wdt_clk);
+	clk_put(wdt_clk);
+
 	return 0;
 }
 

drivers/watchdog/iop_wdt.c

@@ -139,7 +139,7 @@ static long iop_wdt_ioctl(struct file *file,
 
 	switch (cmd) {
 	case WDIOC_GETSUPPORT:
-		if (copy_to_user(argp, &ident, sizeof ident))
+		if (copy_to_user(argp, &ident, sizeof(ident)))
 			ret = -EFAULT;
 		else
 			ret = 0;

drivers/watchdog/nuc900_wdt.c

+/*
+ * Copyright (c) 2009 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/uaccess.h>
+
+#define REG_WTCR		0x1c
+#define WTCLK			(0x01 << 10)
+#define WTE			(0x01 << 7)	/*wdt enable*/
+#define WTIS			(0x03 << 4)
+#define WTIF			(0x01 << 3)
+#define WTRF			(0x01 << 2)
+#define WTRE			(0x01 << 1)
+#define WTR			(0x01 << 0)
+/*
+ * The watchdog time interval can be calculated via following formula:
+ * WTIS		real time interval (formula)
+ * 0x00		((2^ 14 ) * ((external crystal freq) / 256))seconds
+ * 0x01		((2^ 16 ) * ((external crystal freq) / 256))seconds
+ * 0x02		((2^ 18 ) * ((external crystal freq) / 256))seconds
+ * 0x03		((2^ 20 ) * ((external crystal freq) / 256))seconds
+ *
+ * The external crystal freq is 15Mhz in the nuc900 evaluation board.
+ * So 0x00 = +-0.28 seconds, 0x01 = +-1.12 seconds, 0x02 = +-4.48 seconds,
+ * 0x03 = +- 16.92 seconds..
+ */
+#define WDT_HW_TIMEOUT		0x02
+#define WDT_TIMEOUT		(HZ/2)
+#define WDT_HEARTBEAT		15
+
+static int heartbeat = WDT_HEARTBEAT;
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeats in seconds. "
+	"(default = " __MODULE_STRING(WDT_HEARTBEAT) ")");
+
+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) ")");
+
+struct nuc900_wdt {
+	struct resource  *res;
+	struct clk	 *wdt_clock;
+	struct platform_device *pdev;
+	void __iomem	 *wdt_base;
+	char		 expect_close;
+	struct timer_list timer;
+	spinlock_t       wdt_lock;
+	unsigned long next_heartbeat;
+};
+
+static unsigned long nuc900wdt_busy;
+struct nuc900_wdt *nuc900_wdt;
+
+static inline void nuc900_wdt_keepalive(void)
+{
+	unsigned int val;
+
+	spin_lock(&nuc900_wdt->wdt_lock);
+
+	val = __raw_readl(nuc900_wdt->wdt_base + REG_WTCR);
+	val |= (WTR | WTIF);
+	__raw_writel(val, nuc900_wdt->wdt_base + REG_WTCR);
+
+	spin_unlock(&nuc900_wdt->wdt_lock);
+}
+
+static inline void nuc900_wdt_start(void)
+{
+	unsigned int val;
+
+	spin_lock(&nuc900_wdt->wdt_lock);
+
+	val = __raw_readl(nuc900_wdt->wdt_base + REG_WTCR);
+	val |= (WTRE | WTE | WTR | WTCLK | WTIF);
+	val &= ~WTIS;
+	val |= (WDT_HW_TIMEOUT << 0x04);
+	__raw_writel(val, nuc900_wdt->wdt_base + REG_WTCR);
+
+	spin_unlock(&nuc900_wdt->wdt_lock);
+
+	nuc900_wdt->next_heartbeat = jiffies + heartbeat * HZ;
+	mod_timer(&nuc900_wdt->timer, jiffies + WDT_TIMEOUT);
+}
+
+static inline void nuc900_wdt_stop(void)
+{
+	unsigned int val;
+
+	del_timer(&nuc900_wdt->timer);
+
+	spin_lock(&nuc900_wdt->wdt_lock);
+
+	val = __raw_readl(nuc900_wdt->wdt_base + REG_WTCR);
+	val &= ~WTE;
+	__raw_writel(val, nuc900_wdt->wdt_base + REG_WTCR);
+
+	spin_unlock(&nuc900_wdt->wdt_lock);
+}
+
+static inline void nuc900_wdt_ping(void)
+{
+	nuc900_wdt->next_heartbeat = jiffies + heartbeat * HZ;
+}
+
+static int nuc900_wdt_open(struct inode *inode, struct file *file)
+{
+
+	if (test_and_set_bit(0, &nuc900wdt_busy))
+		return -EBUSY;
+
+	nuc900_wdt_start();
+
+	return nonseekable_open(inode, file);
+}
+
+static int nuc900_wdt_close(struct inode *inode, struct file *file)
+{
+	if (nuc900_wdt->expect_close == 42)
+		nuc900_wdt_stop();
+	else {
+		dev_crit(&nuc900_wdt->pdev->dev,
+			"Unexpected close, not stopping watchdog!\n");
+		nuc900_wdt_ping();
+	}
+
+	nuc900_wdt->expect_close = 0;
+	clear_bit(0, &nuc900wdt_busy);
+	return 0;
+}
+
+static const struct watchdog_info nuc900_wdt_info = {
+	.identity	= "nuc900 watchdog",
+	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+						WDIOF_MAGICCLOSE,
+};
+
+static long nuc900_wdt_ioctl(struct file *file,
+					unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	int new_value;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		return copy_to_user(argp, &nuc900_wdt_info,
+				sizeof(nuc900_wdt_info)) ? -EFAULT : 0;
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, p);
+
+	case WDIOC_KEEPALIVE:
+		nuc900_wdt_ping();
+		return 0;
+
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_value, p))
+			return -EFAULT;
+
+		heartbeat = new_value;
+		nuc900_wdt_ping();
+
+		return put_user(new_value, p);
+	case WDIOC_GETTIMEOUT:
+		return put_user(heartbeat, p);
+	default:
+		return -ENOTTY;
+	}
+}
+
+static ssize_t nuc900_wdt_write(struct file *file, const char __user *data,
+						size_t len, loff_t *ppos)
+{
+	if (!len)
+		return 0;
+
+	/* Scan for magic character */
+	if (!nowayout) {
+		size_t i;
+
+		nuc900_wdt->expect_close = 0;
+
+		for (i = 0; i < len; i++) {
+			char c;
+			if (get_user(c, data + i))
+				return -EFAULT;
+			if (c == 'V') {
+				nuc900_wdt->expect_close = 42;
+				break;
+			}
+		}
+	}
+
+	nuc900_wdt_ping();
+	return len;
+}
+
+static void nuc900_wdt_timer_ping(unsigned long data)
+{
+	if (time_before(jiffies, nuc900_wdt->next_heartbeat)) {
+		nuc900_wdt_keepalive();
+		mod_timer(&nuc900_wdt->timer, jiffies + WDT_TIMEOUT);
+	} else
+		dev_warn(&nuc900_wdt->pdev->dev, "Will reset the machine !\n");
+}
+
+static const struct file_operations nuc900wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.unlocked_ioctl	= nuc900_wdt_ioctl,
+	.open		= nuc900_wdt_open,
+	.release	= nuc900_wdt_close,
+	.write		= nuc900_wdt_write,
+};
+
+static struct miscdevice nuc900wdt_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &nuc900wdt_fops,
+};
+
+static int __devinit nuc900wdt_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	nuc900_wdt = kzalloc(sizeof(struct nuc900_wdt), GFP_KERNEL);
+	if (!nuc900_wdt)
+		return -ENOMEM;
+
+	nuc900_wdt->pdev = pdev;
+
+	spin_lock_init(&nuc900_wdt->wdt_lock);
+
+	nuc900_wdt->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (nuc900_wdt->res == NULL) {
+		dev_err(&pdev->dev, "no memory resource specified\n");
+		ret = -ENOENT;
+		goto err_get;
+	}
+
+	if (!request_mem_region(nuc900_wdt->res->start,
+				resource_size(nuc900_wdt->res), pdev->name)) {
+		dev_err(&pdev->dev, "failed to get memory region\n");
+		ret = -ENOENT;
+		goto err_get;
+	}
+
+	nuc900_wdt->wdt_base = ioremap(nuc900_wdt->res->start,
+					resource_size(nuc900_wdt->res));
+	if (nuc900_wdt->wdt_base == NULL) {
+		dev_err(&pdev->dev, "failed to ioremap() region\n");
+		ret = -EINVAL;
+		goto err_req;
+	}
+
+	nuc900_wdt->wdt_clock = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(nuc900_wdt->wdt_clock)) {
+		dev_err(&pdev->dev, "failed to find watchdog clock source\n");
+		ret = PTR_ERR(nuc900_wdt->wdt_clock);
+		goto err_map;
+	}
+
+	clk_enable(nuc900_wdt->wdt_clock);
+
+	setup_timer(&nuc900_wdt->timer, nuc900_wdt_timer_ping, 0);
+
+	if (misc_register(&nuc900wdt_miscdev)) {
+		dev_err(&pdev->dev, "err register miscdev on minor=%d (%d)\n",
+			WATCHDOG_MINOR, ret);
+		goto err_clk;
+	}
+
+	return 0;
+
+err_clk:
+	clk_disable(nuc900_wdt->wdt_clock);
+	clk_put(nuc900_wdt->wdt_clock);
+err_map:
+	iounmap(nuc900_wdt->wdt_base);
+err_req:
+	release_mem_region(nuc900_wdt->res->start,
+					resource_size(nuc900_wdt->res));
+err_get:
+	kfree(nuc900_wdt);
+	return ret;
+}
+
+static int __devexit nuc900wdt_remove(struct platform_device *pdev)
+{
+	misc_deregister(&nuc900wdt_miscdev);
+
+	clk_disable(nuc900_wdt->wdt_clock);
+	clk_put(nuc900_wdt->wdt_clock);
+
+	iounmap(nuc900_wdt->wdt_base);
+
+	release_mem_region(nuc900_wdt->res->start,
+					resource_size(nuc900_wdt->res));
+
+	kfree(nuc900_wdt);
+
+	return 0;
+}
+
+static struct platform_driver nuc900wdt_driver = {
+	.probe		= nuc900wdt_probe,
+	.remove		= __devexit_p(nuc900wdt_remove),
+	.driver		= {
+		.name	= "nuc900-wdt",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init nuc900_wdt_init(void)
+{
+	return platform_driver_register(&nuc900wdt_driver);
+}
+
+static void __exit nuc900_wdt_exit(void)
+{
+	platform_driver_unregister(&nuc900wdt_driver);
+}
+
+module_init(nuc900_wdt_init);
+module_exit(nuc900_wdt_exit);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("Watchdog driver for NUC900");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS("platform:nuc900-wdt");

drivers/watchdog/rm9k_wdt.c

@@ -340,7 +340,7 @@ static const struct resource *wdt_gpi_get_resource(struct platform_device *pdv,
 					const char *name, unsigned int type)
 {
 	char buf[80];
-	if (snprintf(buf, sizeof buf, "%s_0", name) >= sizeof buf)
+	if (snprintf(buf, sizeof(buf), "%s_0", name) >= sizeof(buf))
 		return NULL;
 	return platform_get_resource_byname(pdv, type, buf);
 }

drivers/watchdog/sbc_fitpc2_wdt.c

+/*
+ * Watchdog driver for SBC-FITPC2 board
+ *
+ * Author: Denis Turischev <denis@compulab.co.il>
+ *
+ * Adapted from the IXP2000 watchdog driver by Deepak Saxena.
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME " WATCHDOG: " fmt
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/dmi.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <asm/system.h>
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+static unsigned int margin = 60;	/* (secs) Default is 1 minute */
+static unsigned long wdt_status;
+static DEFINE_SPINLOCK(wdt_lock);
+
+#define WDT_IN_USE		0
+#define WDT_OK_TO_CLOSE		1
+
+#define COMMAND_PORT		0x4c
+#define DATA_PORT		0x48
+
+#define IFACE_ON_COMMAND	1
+#define REBOOT_COMMAND		2
+
+#define WATCHDOG_NAME 		"SBC-FITPC2 Watchdog"
+
+static void wdt_send_data(unsigned char command, unsigned char data)
+{
+	outb(command, COMMAND_PORT);
+	mdelay(100);
+	outb(data, DATA_PORT);
+	mdelay(200);
+}
+
+static void wdt_enable(void)
+{
+	spin_lock(&wdt_lock);
+	wdt_send_data(IFACE_ON_COMMAND, 1);
+	wdt_send_data(REBOOT_COMMAND, margin);
+	spin_unlock(&wdt_lock);
+}
+
+static void wdt_disable(void)
+{
+	spin_lock(&wdt_lock);
+	wdt_send_data(IFACE_ON_COMMAND, 0);
+	wdt_send_data(REBOOT_COMMAND, 0);
+	spin_unlock(&wdt_lock);
+}
+
+static int fitpc2_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(WDT_IN_USE, &wdt_status))
+		return -EBUSY;
+
+	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+	wdt_enable();
+
+	return nonseekable_open(inode, file);
+}
+
+static ssize_t fitpc2_wdt_write(struct file *file, const char *data,
+						size_t len, loff_t *ppos)
+{
+	size_t i;
+
+	if (!len)
+		return 0;
+
+	if (nowayout) {
+		len = 0;
+		goto out;
+	}
+
+	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+	for (i = 0; i != len; i++) {
+		char c;
+
+		if (get_user(c, data + i))
+			return -EFAULT;
+
+		if (c == 'V')
+			set_bit(WDT_OK_TO_CLOSE, &wdt_status);
+	}
+
+out:
+	wdt_enable();
+
+	return len;
+}
+
+
+static struct watchdog_info ident = {
+	.options	= WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
+				WDIOF_KEEPALIVEPING,
+	.identity	= WATCHDOG_NAME,
+};
+
+
+static long fitpc2_wdt_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
+{
+	int ret = -ENOTTY;
+	int time;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		ret = copy_to_user((struct watchdog_info *)arg, &ident,
+				   sizeof(ident)) ? -EFAULT : 0;
+		break;
+
+	case WDIOC_GETSTATUS:
+		ret = put_user(0, (int *)arg);
+		break;
+
+	case WDIOC_GETBOOTSTATUS:
+		ret = put_user(0, (int *)arg);
+		break;
+
+	case WDIOC_KEEPALIVE:
+		wdt_enable();
+		ret = 0;
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		ret = get_user(time, (int *)arg);
+		if (ret)
+			break;
+
+		if (time < 31 || time > 255) {
+			ret = -EINVAL;
+			break;
+		}
+
+		margin = time;
+		wdt_enable();
+		/* Fall through */
+
+	case WDIOC_GETTIMEOUT:
+		ret = put_user(margin, (int *)arg);
+		break;
+	}
+
+	return ret;
+}
+
+static int fitpc2_wdt_release(struct inode *inode, struct file *file)
+{
+	if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) {
+		wdt_disable();
+		pr_info("Device disabled\n");
+	} else {
+		pr_warning("Device closed unexpectedly -"
+			" timer will not stop\n");
+		wdt_enable();
+	}
+
+	clear_bit(WDT_IN_USE, &wdt_status);
+	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+	return 0;
+}
+
+
+static const struct file_operations fitpc2_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= fitpc2_wdt_write,
+	.unlocked_ioctl	= fitpc2_wdt_ioctl,
+	.open		= fitpc2_wdt_open,
+	.release	= fitpc2_wdt_release,
+};
+
+static struct miscdevice fitpc2_wdt_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &fitpc2_wdt_fops,
+};
+
+static int __init fitpc2_wdt_init(void)
+{
+	int err;
+
+	if (strcmp("SBC-FITPC2", dmi_get_system_info(DMI_BOARD_NAME))) {
+		pr_info("board name is: %s. Should be SBC-FITPC2\n",
+			dmi_get_system_info(DMI_BOARD_NAME));
+		return -ENODEV;
+	}
+
+	if (!request_region(COMMAND_PORT, 1, WATCHDOG_NAME)) {
+		pr_err("I/O address 0x%04x already in use\n", COMMAND_PORT);
+		return -EIO;
+	}
+
+	if (!request_region(DATA_PORT, 1, WATCHDOG_NAME)) {
+		pr_err("I/O address 0x%04x already in use\n", DATA_PORT);
+		err = -EIO;
+		goto err_data_port;
+	}
+
+	if (margin < 31 || margin > 255) {
+		pr_err("margin must be in range 31 - 255"
+		       " seconds, you tried to set %d\n", margin);
+		err = -EINVAL;
+		goto err_margin;
+	}
+
+	err = misc_register(&fitpc2_wdt_miscdev);
+	if (!err) {
+		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+							WATCHDOG_MINOR, err);
+		goto err_margin;
+	}
+
+	return 0;
+
+err_margin:
+	release_region(DATA_PORT, 1);
+err_data_port:
+	release_region(COMMAND_PORT, 1);
+
+	return err;
+}
+
+static void __exit fitpc2_wdt_exit(void)
+{
+	misc_deregister(&fitpc2_wdt_miscdev);
+	release_region(DATA_PORT, 1);
+	release_region(COMMAND_PORT, 1);
+}
+
+module_init(fitpc2_wdt_init);
+module_exit(fitpc2_wdt_exit);
+
+MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
+MODULE_DESCRIPTION("SBC-FITPC2 Watchdog");
+
+module_param(margin, int, 0);
+MODULE_PARM_DESC(margin, "Watchdog margin in seconds (default 60s)");
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+

drivers/watchdog/sc1200wdt.c

@@ -197,7 +197,7 @@ static long sc1200wdt_ioctl(struct file *file, unsigned int cmd,
 
 	switch (cmd) {
 	case WDIOC_GETSUPPORT:
-		if (copy_to_user(argp, &ident, sizeof ident))
+		if (copy_to_user(argp, &ident, sizeof(ident)))
 			return -EFAULT;
 		return 0;
 

drivers/watchdog/wdt_pci.c

@@ -80,7 +80,7 @@ static unsigned long open_lock;
 static DEFINE_SPINLOCK(wdtpci_lock);
 static char expect_close;
 
-static int io;
+static resource_size_t io;
 static int irq;
 
 /* Default timeout */
@@ -647,14 +647,15 @@ static int __devinit wdtpci_init_one(struct pci_dev *dev,
 		goto out_pci;
 	}
 
-	irq = dev->irq;
-	io = pci_resource_start(dev, 2);
-
-	if (request_region(io, 16, "wdt_pci") == NULL) {
-		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", io);
+	if (pci_request_region(dev, 2, "wdt_pci")) {
+		printk(KERN_ERR PFX "I/O address 0x%llx already in use\n",
+			(unsigned long long)pci_resource_start(dev, 2));
 		goto out_pci;
 	}
 
+	irq = dev->irq;
+	io = pci_resource_start(dev, 2);
+
 	if (request_irq(irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED,
 			 "wdt_pci", &wdtpci_miscdev)) {
 		printk(KERN_ERR PFX "IRQ %d is not free\n", irq);
@@ -662,8 +663,8 @@ static int __devinit wdtpci_init_one(struct pci_dev *dev,
 	}
 
 	printk(KERN_INFO
-	 "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n",
-								io, irq);
+	 "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
+					(unsigned long long)io, irq);
 
 	/* Check that the heartbeat value is within its range;
 	   if not reset to the default */
@@ -717,7 +718,7 @@ out_rbt:
 out_irq:
 	free_irq(irq, &wdtpci_miscdev);
 out_reg:
-	release_region(io, 16);
+	pci_release_region(dev, 2);
 out_pci:
 	pci_disable_device(dev);
 	goto out;
@@ -733,7 +734,7 @@ static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
 		misc_deregister(&temp_miscdev);
 	unregister_reboot_notifier(&wdtpci_notifier);
 	free_irq(irq, &wdtpci_miscdev);
-	release_region(io, 16);
+	pci_release_region(pdev, 2);
 	pci_disable_device(pdev);
 	dev_count--;
 }

drivers/watchdog/wm831x_wdt.c

+/*
+ * Watchdog driver for the wm831x PMICs
+ *
+ * Copyright (C) 2009 Wolfson Microelectronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/uaccess.h>
+#include <linux/gpio.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+#include <linux/mfd/wm831x/watchdog.h>
+
+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) ")");
+
+static unsigned long wm831x_wdt_users;
+static struct miscdevice wm831x_wdt_miscdev;
+static int wm831x_wdt_expect_close;
+static DEFINE_MUTEX(wdt_mutex);
+static struct wm831x *wm831x;
+static unsigned int update_gpio;
+static unsigned int update_state;
+
+/* We can't use the sub-second values here but they're included
+ * for completeness.  */
+static struct {
+	int time;  /* Seconds */
+	u16 val;   /* WDOG_TO value */
+} wm831x_wdt_cfgs[] = {
+	{  1, 2 },
+	{  2, 3 },
+	{  4, 4 },
+	{  8, 5 },
+	{ 16, 6 },
+	{ 32, 7 },
+	{ 33, 7 },  /* Actually 32.768s so include both, others round down */
+};
+
+static int wm831x_wdt_set_timeout(struct wm831x *wm831x, u16 value)
+{
+	int ret;
+
+	mutex_lock(&wdt_mutex);
+
+	ret = wm831x_reg_unlock(wm831x);
+	if (ret == 0) {
+		ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
+				      WM831X_WDOG_TO_MASK, value);
+		wm831x_reg_lock(wm831x);
+	} else {
+		dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
+			ret);
+	}
+
+	mutex_unlock(&wdt_mutex);
+
+	return ret;
+}
+
+static int wm831x_wdt_start(struct wm831x *wm831x)
+{
+	int ret;
+
+	mutex_lock(&wdt_mutex);
+
+	ret = wm831x_reg_unlock(wm831x);
+	if (ret == 0) {
+		ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
+				      WM831X_WDOG_ENA, WM831X_WDOG_ENA);
+		wm831x_reg_lock(wm831x);
+	} else {
+		dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
+			ret);
+	}
+
+	mutex_unlock(&wdt_mutex);
+
+	return ret;
+}
+
+static int wm831x_wdt_stop(struct wm831x *wm831x)
+{
+	int ret;
+
+	mutex_lock(&wdt_mutex);
+
+	ret = wm831x_reg_unlock(wm831x);
+	if (ret == 0) {
+		ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
+				      WM831X_WDOG_ENA, 0);
+		wm831x_reg_lock(wm831x);
+	} else {
+		dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
+			ret);
+	}
+
+	mutex_unlock(&wdt_mutex);
+
+	return ret;
+}
+
+static int wm831x_wdt_kick(struct wm831x *wm831x)
+{
+	int ret;
+	u16 reg;
+
+	mutex_lock(&wdt_mutex);
+
+	if (update_gpio) {
+		gpio_set_value_cansleep(update_gpio, update_state);
+		update_state = !update_state;
+		ret = 0;
+		goto out;
+	}
+
+
+	reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG);
+
+	if (!(reg & WM831X_WDOG_RST_SRC)) {
+		dev_err(wm831x->dev, "Hardware watchdog update unsupported\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	reg |= WM831X_WDOG_RESET;
+
+	ret = wm831x_reg_unlock(wm831x);
+	if (ret == 0) {
+		ret = wm831x_reg_write(wm831x, WM831X_WATCHDOG, reg);
+		wm831x_reg_lock(wm831x);
+	} else {
+		dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
+			ret);
+	}
+
+out:
+	mutex_unlock(&wdt_mutex);
+
+	return ret;
+}
+
+static int wm831x_wdt_open(struct inode *inode, struct file *file)
+{
+	int ret;
+
+	if (!wm831x)
+		return -ENODEV;
+
+	if (test_and_set_bit(0, &wm831x_wdt_users))
+		return -EBUSY;
+
+	ret = wm831x_wdt_start(wm831x);
+	if (ret != 0)
+		return ret;
+
+	return nonseekable_open(inode, file);
+}
+
+static int wm831x_wdt_release(struct inode *inode, struct file *file)
+{
+	if (wm831x_wdt_expect_close)
+		wm831x_wdt_stop(wm831x);
+	else {
+		dev_warn(wm831x->dev, "Watchdog device closed uncleanly\n");
+		wm831x_wdt_kick(wm831x);
+	}
+
+	clear_bit(0, &wm831x_wdt_users);
+
+	return 0;
+}
+
+static ssize_t wm831x_wdt_write(struct file *file,
+				const char __user *data, size_t count,
+				loff_t *ppos)
+{
+	size_t i;
+
+	if (count) {
+		wm831x_wdt_kick(wm831x);
+
+		if (!nowayout) {
+			/* In case it was set long ago */
+			wm831x_wdt_expect_close = 0;
+
+			/* scan to see whether or not we got the magic
+			   character */
+			for (i = 0; i != count; i++) {
+				char c;
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					wm831x_wdt_expect_close = 42;
+			}
+		}
+	}
+	return count;
+}
+
+static struct watchdog_info ident = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+	.identity = "WM831x Watchdog",
+};
+
+static long wm831x_wdt_ioctl(struct file *file, unsigned int cmd,
+			     unsigned long arg)
+{
+	int ret = -ENOTTY, time, i;
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	u16 reg;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		ret = copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
+		break;
+
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		ret = put_user(0, p);
+		break;
+
+	case WDIOC_SETOPTIONS:
+	{
+		int options;
+
+		if (get_user(options, p))
+			return -EFAULT;
+
+		ret = -EINVAL;
+
+		/* Setting both simultaneously means at least one must fail */
+		if (options == WDIOS_DISABLECARD)
+			ret = wm831x_wdt_start(wm831x);
+
+		if (options == WDIOS_ENABLECARD)
+			ret = wm831x_wdt_stop(wm831x);
+		break;
+	}
+
+	case WDIOC_KEEPALIVE:
+		ret = wm831x_wdt_kick(wm831x);
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		ret = get_user(time, p);
+		if (ret)
+			break;
+
+		if (time == 0) {
+			if (nowayout)
+				ret = -EINVAL;
+			else
+				wm831x_wdt_stop(wm831x);
+			break;
+		}
+
+		for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++)
+			if (wm831x_wdt_cfgs[i].time == time)
+				break;
+		if (i == ARRAY_SIZE(wm831x_wdt_cfgs))
+			ret = -EINVAL;
+		else
+			ret = wm831x_wdt_set_timeout(wm831x,
+						     wm831x_wdt_cfgs[i].val);
+		break;
+
+	case WDIOC_GETTIMEOUT:
+		reg = wm831x_reg_read(wm831x, WM831X_WATCHDOG);
+		reg &= WM831X_WDOG_TO_MASK;
+		for (i = 0; i < ARRAY_SIZE(wm831x_wdt_cfgs); i++)
+			if (wm831x_wdt_cfgs[i].val == reg)
+				break;
+		if (i == ARRAY_SIZE(wm831x_wdt_cfgs)) {
+			dev_warn(wm831x->dev,
+				 "Unknown watchdog configuration: %x\n", reg);
+			ret = -EINVAL;
+		} else
+			ret = put_user(wm831x_wdt_cfgs[i].time, p);
+
+	}
+
+	return ret;
+}
+
+static const struct file_operations wm831x_wdt_fops = {
+	.owner = THIS_MODULE,
+	.llseek = no_llseek,
+	.write = wm831x_wdt_write,
+	.unlocked_ioctl = wm831x_wdt_ioctl,
+	.open = wm831x_wdt_open,
+	.release = wm831x_wdt_release,
+};
+
+static struct miscdevice wm831x_wdt_miscdev = {
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &wm831x_wdt_fops,
+};
+
+static int __devinit wm831x_wdt_probe(struct platform_device *pdev)
+{
+	struct wm831x_pdata *chip_pdata;
+	struct wm831x_watchdog_pdata *pdata;
+	int reg, ret;
+
+	wm831x = dev_get_drvdata(pdev->dev.parent);
+
+	ret = wm831x_reg_read(wm831x, WM831X_WATCHDOG);
+	if (ret < 0) {
+		dev_err(wm831x->dev, "Failed to read watchdog status: %d\n",
+			ret);
+		goto err;
+	}
+	reg = ret;
+
+	if (reg & WM831X_WDOG_DEBUG)
+		dev_warn(wm831x->dev, "Watchdog is paused\n");
+
+	/* Apply any configuration */
+	if (pdev->dev.parent->platform_data) {
+		chip_pdata = pdev->dev.parent->platform_data;
+		pdata = chip_pdata->watchdog;
+	} else {
+		pdata = NULL;
+	}
+
+	if (pdata) {
+		reg &= ~(WM831X_WDOG_SECACT_MASK | WM831X_WDOG_PRIMACT_MASK |
+			 WM831X_WDOG_RST_SRC);
+
+		reg |= pdata->primary << WM831X_WDOG_PRIMACT_SHIFT;
+		reg |= pdata->secondary << WM831X_WDOG_SECACT_SHIFT;
+		reg |= pdata->software << WM831X_WDOG_RST_SRC_SHIFT;
+
+		if (pdata->update_gpio) {
+			ret = gpio_request(pdata->update_gpio,
+					   "Watchdog update");
+			if (ret < 0) {
+				dev_err(wm831x->dev,
+					"Failed to request update GPIO: %d\n",
+					ret);
+				goto err;
+			}
+
+			ret = gpio_direction_output(pdata->update_gpio, 0);
+			if (ret != 0) {
+				dev_err(wm831x->dev,
+					"gpio_direction_output returned: %d\n",
+					ret);
+				goto err_gpio;
+			}
+
+			update_gpio = pdata->update_gpio;
+
+			/* Make sure the watchdog takes hardware updates */
+			reg |= WM831X_WDOG_RST_SRC;
+		}
+
+		ret = wm831x_reg_unlock(wm831x);
+		if (ret == 0) {
+			ret = wm831x_reg_write(wm831x, WM831X_WATCHDOG, reg);
+			wm831x_reg_lock(wm831x);
+		} else {
+			dev_err(wm831x->dev,
+				"Failed to unlock security key: %d\n", ret);
+			goto err_gpio;
+		}
+	}
+
+	wm831x_wdt_miscdev.parent = &pdev->dev;
+
+	ret = misc_register(&wm831x_wdt_miscdev);
+	if (ret != 0) {
+		dev_err(wm831x->dev, "Failed to register miscdev: %d\n", ret);
+		goto err_gpio;
+	}
+
+	return 0;
+
+err_gpio:
+	if (update_gpio) {
+		gpio_free(update_gpio);
+		update_gpio = 0;
+	}
+err:
+	return ret;
+}
+
+static int __devexit wm831x_wdt_remove(struct platform_device *pdev)
+{
+	if (update_gpio) {
+		gpio_free(update_gpio);
+		update_gpio = 0;
+	}
+
+	misc_deregister(&wm831x_wdt_miscdev);
+
+	return 0;
+}
+
+static struct platform_driver wm831x_wdt_driver = {
+	.probe = wm831x_wdt_probe,
+	.remove = __devexit_p(wm831x_wdt_remove),
+	.driver = {
+		.name = "wm831x-watchdog",
+	},
+};
+
+static int __init wm831x_wdt_init(void)
+{
+	return platform_driver_register(&wm831x_wdt_driver);
+}
+module_init(wm831x_wdt_init);
+
+static void __exit wm831x_wdt_exit(void)
+{
+	platform_driver_unregister(&wm831x_wdt_driver);
+}
+module_exit(wm831x_wdt_exit);
+
+MODULE_AUTHOR("Mark Brown");
+MODULE_DESCRIPTION("WM831x Watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm831x-watchdog");

include/linux/mfd/wm831x/watchdog.h

+/*
+ * include/linux/mfd/wm831x/watchdog.h -- Watchdog for WM831x
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#ifndef __MFD_WM831X_WATCHDOG_H__
+#define __MFD_WM831X_WATCHDOG_H__
+
+
+/*
+ * R16388 (0x4004) - Watchdog
+ */
+#define WM831X_WDOG_ENA                         0x8000  /* WDOG_ENA */
+#define WM831X_WDOG_ENA_MASK                    0x8000  /* WDOG_ENA */
+#define WM831X_WDOG_ENA_SHIFT                       15  /* WDOG_ENA */
+#define WM831X_WDOG_ENA_WIDTH                        1  /* WDOG_ENA */
+#define WM831X_WDOG_DEBUG                       0x4000  /* WDOG_DEBUG */
+#define WM831X_WDOG_DEBUG_MASK                  0x4000  /* WDOG_DEBUG */
+#define WM831X_WDOG_DEBUG_SHIFT                     14  /* WDOG_DEBUG */
+#define WM831X_WDOG_DEBUG_WIDTH                      1  /* WDOG_DEBUG */
+#define WM831X_WDOG_RST_SRC                     0x2000  /* WDOG_RST_SRC */
+#define WM831X_WDOG_RST_SRC_MASK                0x2000  /* WDOG_RST_SRC */
+#define WM831X_WDOG_RST_SRC_SHIFT                   13  /* WDOG_RST_SRC */
+#define WM831X_WDOG_RST_SRC_WIDTH                    1  /* WDOG_RST_SRC */
+#define WM831X_WDOG_SLPENA                      0x1000  /* WDOG_SLPENA */
+#define WM831X_WDOG_SLPENA_MASK                 0x1000  /* WDOG_SLPENA */
+#define WM831X_WDOG_SLPENA_SHIFT                    12  /* WDOG_SLPENA */
+#define WM831X_WDOG_SLPENA_WIDTH                     1  /* WDOG_SLPENA */
+#define WM831X_WDOG_RESET                       0x0800  /* WDOG_RESET */
+#define WM831X_WDOG_RESET_MASK                  0x0800  /* WDOG_RESET */
+#define WM831X_WDOG_RESET_SHIFT                     11  /* WDOG_RESET */
+#define WM831X_WDOG_RESET_WIDTH                      1  /* WDOG_RESET */
+#define WM831X_WDOG_SECACT_MASK                 0x0300  /* WDOG_SECACT - [9:8] */
+#define WM831X_WDOG_SECACT_SHIFT                     8  /* WDOG_SECACT - [9:8] */
+#define WM831X_WDOG_SECACT_WIDTH                     2  /* WDOG_SECACT - [9:8] */
+#define WM831X_WDOG_PRIMACT_MASK                0x0030  /* WDOG_PRIMACT - [5:4] */
+#define WM831X_WDOG_PRIMACT_SHIFT                    4  /* WDOG_PRIMACT - [5:4] */
+#define WM831X_WDOG_PRIMACT_WIDTH                    2  /* WDOG_PRIMACT - [5:4] */
+#define WM831X_WDOG_TO_MASK                     0x0007  /* WDOG_TO - [2:0] */
+#define WM831X_WDOG_TO_SHIFT                         0  /* WDOG_TO - [2:0] */
+#define WM831X_WDOG_TO_WIDTH                         3  /* WDOG_TO - [2:0] */
+
+#endif