File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c
new file mode 100644
index 0000000..016bd93
--- /dev/null
+++ b/drivers/watchdog/f71808e_wdt.c
@@ -0,0 +1,820 @@
+/***************************************************************************
+ * Copyright (C) 2006 by Hans Edgington <hans@edgington.nl> *
+ * Copyright (C) 2007-2009 Hans de Goede <hdegoede@redhat.com> *
+ * Copyright (C) 2010 Giel van Schijndel <me@mortis.eu> *
+ * *
+ * 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. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program; if not, write to the *
+ * Free Software Foundation, Inc., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ ***************************************************************************/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/uaccess.h>
+#include <linux/watchdog.h>
+
+#define DRVNAME "f71808e_wdt"
+
+#define SIO_F71808FG_LD_WDT 0x07 /* Watchdog timer logical device */
+#define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */
+#define SIO_LOCK_KEY 0xAA /* Key to diasble Super-I/O */
+
+#define SIO_REG_LDSEL 0x07 /* Logical device select */
+#define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */
+#define SIO_REG_DEVREV 0x22 /* Device revision */
+#define SIO_REG_MANID 0x23 /* Fintek ID (2 bytes) */
+#define SIO_REG_ROM_ADDR_SEL 0x27 /* ROM address select */
+#define SIO_REG_MFUNCT1 0x29 /* Multi function select 1 */
+#define SIO_REG_MFUNCT2 0x2a /* Multi function select 2 */
+#define SIO_REG_MFUNCT3 0x2b /* Multi function select 3 */
+#define SIO_REG_ENABLE 0x30 /* Logical device enable */
+#define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */
+
+#define SIO_FINTEK_ID 0x1934 /* Manufacturers ID */
+#define SIO_F71808_ID 0x0901 /* Chipset ID */
+#define SIO_F71858_ID 0x0507 /* Chipset ID */
+#define SIO_F71862_ID 0x0601 /* Chipset ID */
+#define SIO_F71869_ID 0x0814 /* Chipset ID */
+#define SIO_F71869A_ID 0x1007 /* Chipset ID */
+#define SIO_F71882_ID 0x0541 /* Chipset ID */
+#define SIO_F71889_ID 0x0723 /* Chipset ID */
+
+#define F71808FG_REG_WDO_CONF 0xf0
+#define F71808FG_REG_WDT_CONF 0xf5
+#define F71808FG_REG_WD_TIME 0xf6
+
+#define F71808FG_FLAG_WDOUT_EN 7
+
+#define F71808FG_FLAG_WDTMOUT_STS 5
+#define F71808FG_FLAG_WD_EN 5
+#define F71808FG_FLAG_WD_PULSE 4
+#define F71808FG_FLAG_WD_UNIT 3
+
+/* Default values */
+#define WATCHDOG_TIMEOUT 60 /* 1 minute default timeout */
+#define WATCHDOG_MAX_TIMEOUT (60 * 255)
+#define WATCHDOG_PULSE_WIDTH 125 /* 125 ms, default pulse width for
+ watchdog signal */
+#define WATCHDOG_F71862FG_PIN 63 /* default watchdog reset output
+ pin number 63 */
+
+static unsigned short force_id;
+module_param(force_id, ushort, 0);
+MODULE_PARM_DESC(force_id, "Override the detected device ID");
+
+static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
+static int timeout = WATCHDOG_TIMEOUT; /* default timeout in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. 1<= timeout <="
+ __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
+ __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+
+static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
+module_param(pulse_width, uint, 0);
+MODULE_PARM_DESC(pulse_width,
+ "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
+ " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
+
+static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
+module_param(f71862fg_pin, uint, 0);
+MODULE_PARM_DESC(f71862fg_pin,
+ "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
+ " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0444);
+MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
+
+static unsigned int start_withtimeout;
+module_param(start_withtimeout, uint, 0);
+MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
+ " given initial timeout. Zero (default) disables this feature.");
+
+enum chips { f71808fg, f71858fg, f71862fg, f71869, f71882fg, f71889fg };
+
+static const char *f71808e_names[] = {
+ "f71808fg",
+ "f71858fg",
+ "f71862fg",
+ "f71869",
+ "f71882fg",
+ "f71889fg",
+};
+
+/* Super-I/O Function prototypes */
+static inline int superio_inb(int base, int reg);
+static inline int superio_inw(int base, int reg);
+static inline void superio_outb(int base, int reg, u8 val);
+static inline void superio_set_bit(int base, int reg, int bit);
+static inline void superio_clear_bit(int base, int reg, int bit);
+static inline int superio_enter(int base);
+static inline void superio_select(int base, int ld);
+static inline void superio_exit(int base);
+
+struct watchdog_data {
+ unsigned short sioaddr;
+ enum chips type;
+ unsigned long opened;
+ struct mutex lock;
+ char expect_close;
+ struct watchdog_info ident;
+
+ unsigned short timeout;
+ u8 timer_val; /* content for the wd_time register */
+ char minutes_mode;
+ u8 pulse_val; /* pulse width flag */
+ char pulse_mode; /* enable pulse output mode? */
+ char caused_reboot; /* last reboot was by the watchdog */
+};
+
+static struct watchdog_data watchdog = {
+ .lock = __MUTEX_INITIALIZER(watchdog.lock),
+};
+
+/* Super I/O functions */
+static inline int superio_inb(int base, int reg)
+{
+ outb(reg, base);
+ return inb(base + 1);
+}
+
+static int superio_inw(int base, int reg)
+{
+ int val;
+ val = superio_inb(base, reg) << 8;
+ val |= superio_inb(base, reg + 1);
+ return val;
+}
+
+static inline void superio_outb(int base, int reg, u8 val)
+{
+ outb(reg, base);
+ outb(val, base + 1);
+}
+
+static inline void superio_set_bit(int base, int reg, int bit)
+{
+ unsigned long val = superio_inb(base, reg);
+ __set_bit(bit, &val);
+ superio_outb(base, reg, val);
+}
+
+static inline void superio_clear_bit(int base, int reg, int bit)
+{
+ unsigned long val = superio_inb(base, reg);
+ __clear_bit(bit, &val);
+ superio_outb(base, reg, val);
+}
+
+static inline int superio_enter(int base)
+{
+ /* Don't step on other drivers' I/O space by accident */
+ if (!request_muxed_region(base, 2, DRVNAME)) {
+ pr_err("I/O address 0x%04x already in use\n", (int)base);
+ return -EBUSY;
+ }
+
+ /* according to the datasheet the key must be sent twice! */
+ outb(SIO_UNLOCK_KEY, base);
+ outb(SIO_UNLOCK_KEY, base);
+
+ return 0;
+}
+
+static inline void superio_select(int base, int ld)
+{
+ outb(SIO_REG_LDSEL, base);
+ outb(ld, base + 1);
+}
+
+static inline void superio_exit(int base)
+{
+ outb(SIO_LOCK_KEY, base);
+ release_region(base, 2);
+}
+
+static int watchdog_set_timeout(int timeout)
+{
+ if (timeout <= 0
+ || timeout > max_timeout) {
+ pr_err("watchdog timeout out of range\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&watchdog.lock);
+
+ watchdog.timeout = timeout;
+ if (timeout > 0xff) {
+ watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
+ watchdog.minutes_mode = true;
+ } else {
+ watchdog.timer_val = timeout;
+ watchdog.minutes_mode = false;
+ }
+
+ mutex_unlock(&watchdog.lock);
+
+ return 0;
+}
+
+static int watchdog_set_pulse_width(unsigned int pw)
+{
+ int err = 0;
+
+ mutex_lock(&watchdog.lock);
+
+ if (pw <= 1) {
+ watchdog.pulse_val = 0;
+ } else if (pw <= 25) {
+ watchdog.pulse_val = 1;
+ } else if (pw <= 125) {
+ watchdog.pulse_val = 2;
+ } else if (pw <= 5000) {
+ watchdog.pulse_val = 3;
+ } else {
+ pr_err("pulse width out of range\n");
+ err = -EINVAL;
+ goto exit_unlock;
+ }
+
+ watchdog.pulse_mode = pw;
+
+exit_unlock:
+ mutex_unlock(&watchdog.lock);
+ return err;
+}
+
+static int watchdog_keepalive(void)
+{
+ int err = 0;
+
+ mutex_lock(&watchdog.lock);
+ err = superio_enter(watchdog.sioaddr);
+ if (err)
+ goto exit_unlock;
+ superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+
+ if (watchdog.minutes_mode)
+ /* select minutes for timer units */
+ superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
+ F71808FG_FLAG_WD_UNIT);
+ else
+ /* select seconds for timer units */
+ superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
+ F71808FG_FLAG_WD_UNIT);
+
+ /* Set timer value */
+ superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
+ watchdog.timer_val);
+
+ superio_exit(watchdog.sioaddr);
+
+exit_unlock:
+ mutex_unlock(&watchdog.lock);
+ return err;
+}
+
+static int f71862fg_pin_configure(unsigned short ioaddr)
+{
+ /* When ioaddr is non-zero the calling function has to take care of
+ mutex handling and superio preparation! */
+
+ if (f71862fg_pin == 63) {
+ if (ioaddr) {
+ /* SPI must be disabled first to use this pin! */
+ superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
+ superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
+ }
+ } else if (f71862fg_pin == 56) {
+ if (ioaddr)
+ superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
+ } else {
+ pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int watchdog_start(void)
+{
+ /* Make sure we don't die as soon as the watchdog is enabled below */
+ int err = watchdog_keepalive();
+ if (err)
+ return err;
+
+ mutex_lock(&watchdog.lock);
+ err = superio_enter(watchdog.sioaddr);
+ if (err)
+ goto exit_unlock;
+ superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+
+ /* Watchdog pin configuration */
+ switch (watchdog.type) {
+ case f71808fg:
+ /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
+ superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);
+ superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
+ break;
+
+ case f71862fg:
+ err = f71862fg_pin_configure(watchdog.sioaddr);
+ if (err)
+ goto exit_superio;
+ break;
+
+ case f71869:
+ /* GPIO14 --> WDTRST# */
+ superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4);
+ break;
+
+ case f71882fg:
+ /* Set pin 56 to WDTRST# */
+ superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
+ break;
+
+ case f71889fg:
+ /* set pin 40 to WDTRST# */
+ superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,
+ superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
+ break;
+
+ default:
+ /*
+ * 'default' label to shut up the compiler and catch
+ * programmer errors
+ */
+ err = -ENODEV;
+ goto exit_superio;
+ }
+
+ superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+ superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
+ superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
+ F71808FG_FLAG_WDOUT_EN);
+
+ superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
+ F71808FG_FLAG_WD_EN);
+
+ if (watchdog.pulse_mode) {
+ /* Select "pulse" output mode with given duration */
+ u8 wdt_conf = superio_inb(watchdog.sioaddr,
+ F71808FG_REG_WDT_CONF);
+
+ /* Set WD_PSWIDTH bits (1:0) */
+ wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
+ /* Set WD_PULSE to "pulse" mode */
+ wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
+
+ superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
+ wdt_conf);
+ } else {
+ /* Select "level" output mode */
+ superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
+ F71808FG_FLAG_WD_PULSE);
+ }
+
+exit_superio:
+ superio_exit(watchdog.sioaddr);
+exit_unlock:
+ mutex_unlock(&watchdog.lock);
+
+ return err;
+}
+
+static int watchdog_stop(void)
+{
+ int err = 0;
+
+ mutex_lock(&watchdog.lock);
+ err = superio_enter(watchdog.sioaddr);
+ if (err)
+ goto exit_unlock;
+ superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+
+ superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
+ F71808FG_FLAG_WD_EN);
+
+ superio_exit(watchdog.sioaddr);
+
+exit_unlock:
+ mutex_unlock(&watchdog.lock);
+
+ return err;
+}
+
+static int watchdog_get_status(void)
+{
+ int status = 0;
+
+ mutex_lock(&watchdog.lock);
+ status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
+ mutex_unlock(&watchdog.lock);
+
+ return status;
+}
+
+static bool watchdog_is_running(void)
+{
+ /*
+ * if we fail to determine the watchdog's status assume it to be
+ * running to be on the safe side
+ */
+ bool is_running = true;
+
+ mutex_lock(&watchdog.lock);
+ if (superio_enter(watchdog.sioaddr))
+ goto exit_unlock;
+ superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+
+ is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
+ && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
+ & F71808FG_FLAG_WD_EN);
+
+ superio_exit(watchdog.sioaddr);
+
+exit_unlock:
+ mutex_unlock(&watchdog.lock);
+ return is_running;
+}
+
+/* /dev/watchdog api */
+
+static int watchdog_open(struct inode *inode, struct file *file)
+{
+ int err;
+
+ /* If the watchdog is alive we don't need to start it again */
+ if (test_and_set_bit(0, &watchdog.opened))
+ return -EBUSY;
+
+ err = watchdog_start();
+ if (err) {
+ clear_bit(0, &watchdog.opened);
+ return err;
+ }
+
+ if (nowayout)
+ __module_get(THIS_MODULE);
+
+ watchdog.expect_close = 0;
+ return nonseekable_open(inode, file);
+}
+
+static int watchdog_release(struct inode *inode, struct file *file)
+{
+ clear_bit(0, &watchdog.opened);
+
+ if (!watchdog.expect_close) {
+ watchdog_keepalive();
+ pr_crit("Unexpected close, not stopping watchdog!\n");
+ } else if (!nowayout) {
+ watchdog_stop();
+ }
+ return 0;
+}
+
+/*
+ * watchdog_write:
+ * @file: file handle to the watchdog
+ * @buf: buffer to write
+ * @count: count of bytes
+ * @ppos: pointer to the position to write. No seeks allowed
+ *
+ * A write to a watchdog device is defined as a keepalive signal. Any
+ * write of data will do, as we we don't define content meaning.
+ */
+
+static ssize_t watchdog_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (count) {
+ if (!nowayout) {
+ size_t i;
+
+ /* In case it was set long ago */
+ bool expect_close = false;
+
+ for (i = 0; i != count; i++) {
+ char c;
+ if (get_user(c, buf + i))
+ return -EFAULT;
+ expect_close = (c == 'V');
+ }
+
+ /* Properly order writes across fork()ed processes */
+ mutex_lock(&watchdog.lock);
+ watchdog.expect_close = expect_close;
+ mutex_unlock(&watchdog.lock);
+ }
+
+ /* someone wrote to us, we should restart timer */
+ watchdog_keepalive();
+ }
+ return count;
+}
+
+/*
+ * watchdog_ioctl:
+ * @inode: inode of the device
+ * @file: file handle to the device
+ * @cmd: watchdog command
+ * @arg: argument pointer
+ *
+ * The watchdog API defines a common set of functions for all watchdogs
+ * according to their available features.
+ */
+static long watchdog_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int status;
+ int new_options;
+ int new_timeout;
+ union {
+ struct watchdog_info __user *ident;
+ int __user *i;
+ } uarg;
+
+ uarg.i = (int __user *)arg;
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ return copy_to_user(uarg.ident, &watchdog.ident,
+ sizeof(watchdog.ident)) ? -EFAULT : 0;
+
+ case WDIOC_GETSTATUS:
+ status = watchdog_get_status();
+ if (status < 0)
+ return status;
+ return put_user(status, uarg.i);
+
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0, uarg.i);
+
+ case WDIOC_SETOPTIONS:
+ if (get_user(new_options, uarg.i))
+ return -EFAULT;
+
+ if (new_options & WDIOS_DISABLECARD)
+ watchdog_stop();
+
+ if (new_options & WDIOS_ENABLECARD)
+ return watchdog_start();
+
+
+ case WDIOC_KEEPALIVE:
+ watchdog_keepalive();
+ return 0;
+
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_timeout, uarg.i))
+ return -EFAULT;
+
+ if (watchdog_set_timeout(new_timeout))
+ return -EINVAL;
+
+ watchdog_keepalive();
+ /* Fall */
+
+ case WDIOC_GETTIMEOUT:
+ return put_user(watchdog.timeout, uarg.i);
+
+ default:
+ return -ENOTTY;
+
+ }
+}
+
+static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
+ void *unused)
+{
+ if (code == SYS_DOWN || code == SYS_HALT)
+ watchdog_stop();
+ return NOTIFY_DONE;
+}
+
+static const struct file_operations watchdog_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .open = watchdog_open,
+ .release = watchdog_release,
+ .write = watchdog_write,
+ .unlocked_ioctl = watchdog_ioctl,
+};
+
+static struct miscdevice watchdog_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &watchdog_fops,
+};
+
+static struct notifier_block watchdog_notifier = {
+ .notifier_call = watchdog_notify_sys,
+};
+
+static int __init watchdog_init(int sioaddr)
+{
+ int wdt_conf, err = 0;
+
+ /* No need to lock watchdog.lock here because no entry points
+ * into the module have been registered yet.
+ */
+ watchdog.sioaddr = sioaddr;
+ watchdog.ident.options = WDIOC_SETTIMEOUT
+ | WDIOF_MAGICCLOSE
+ | WDIOF_KEEPALIVEPING;
+
+ snprintf(watchdog.ident.identity,
+ sizeof(watchdog.ident.identity), "%s watchdog",
+ f71808e_names[watchdog.type]);
+
+ err = superio_enter(sioaddr);
+ if (err)
+ return err;
+ superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+
+ wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
+ watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS;
+
+ superio_exit(sioaddr);
+
+ err = watchdog_set_timeout(timeout);
+ if (err)
+ return err;
+ err = watchdog_set_pulse_width(pulse_width);
+ if (err)
+ return err;
+
+ err = register_reboot_notifier(&watchdog_notifier);
+ if (err)
+ return err;
+
+ err = misc_register(&watchdog_miscdev);
+ if (err) {
+ pr_err("cannot register miscdev on minor=%d\n",
+ watchdog_miscdev.minor);
+ goto exit_reboot;
+ }
+
+ if (start_withtimeout) {
+ if (start_withtimeout <= 0
+ || start_withtimeout > max_timeout) {
+ pr_err("starting timeout out of range\n");
+ err = -EINVAL;
+ goto exit_miscdev;
+ }
+
+ err = watchdog_start();
+ if (err) {
+ pr_err("cannot start watchdog timer\n");
+ goto exit_miscdev;
+ }
+
+ mutex_lock(&watchdog.lock);
+ err = superio_enter(sioaddr);
+ if (err)
+ goto exit_unlock;
+ superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+
+ if (start_withtimeout > 0xff) {
+ /* select minutes for timer units */
+ superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
+ F71808FG_FLAG_WD_UNIT);
+ superio_outb(sioaddr, F71808FG_REG_WD_TIME,
+ DIV_ROUND_UP(start_withtimeout, 60));
+ } else {
+ /* select seconds for timer units */
+ superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
+ F71808FG_FLAG_WD_UNIT);
+ superio_outb(sioaddr, F71808FG_REG_WD_TIME,
+ start_withtimeout);
+ }
+
+ superio_exit(sioaddr);
+ mutex_unlock(&watchdog.lock);
+
+ if (nowayout)
+ __module_get(THIS_MODULE);
+
+ pr_info("watchdog started with initial timeout of %u sec\n",
+ start_withtimeout);
+ }
+
+ return 0;
+
+exit_unlock:
+ mutex_unlock(&watchdog.lock);
+exit_miscdev:
+ misc_deregister(&watchdog_miscdev);
+exit_reboot:
+ unregister_reboot_notifier(&watchdog_notifier);
+
+ return err;
+}
+
+static int __init f71808e_find(int sioaddr)
+{
+ u16 devid;
+ int err = superio_enter(sioaddr);
+ if (err)
+ return err;
+
+ devid = superio_inw(sioaddr, SIO_REG_MANID);
+ if (devid != SIO_FINTEK_ID) {
+ pr_debug("Not a Fintek device\n");
+ err = -ENODEV;
+ goto exit;
+ }
+
+ devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
+ switch (devid) {
+ case SIO_F71808_ID:
+ watchdog.type = f71808fg;
+ break;
+ case SIO_F71862_ID:
+ watchdog.type = f71862fg;
+ err = f71862fg_pin_configure(0); /* validate module parameter */
+ break;
+ case SIO_F71869_ID:
+ case SIO_F71869A_ID:
+ watchdog.type = f71869;
+ break;
+ case SIO_F71882_ID:
+ watchdog.type = f71882fg;
+ break;
+ case SIO_F71889_ID:
+ watchdog.type = f71889fg;
+ break;
+ case SIO_F71858_ID:
+ /* Confirmed (by datasheet) not to have a watchdog. */
+ err = -ENODEV;
+ goto exit;
+ default:
+ pr_info("Unrecognized Fintek device: %04x\n",
+ (unsigned int)devid);
+ err = -ENODEV;
+ goto exit;
+ }
+
+ pr_info("Found %s watchdog chip, revision %d\n",
+ f71808e_names[watchdog.type],
+ (int)superio_inb(sioaddr, SIO_REG_DEVREV));
+exit:
+ superio_exit(sioaddr);
+ return err;
+}
+
+static int __init f71808e_init(void)
+{
+ static const unsigned short addrs[] = { 0x2e, 0x4e };
+ int err = -ENODEV;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(addrs); i++) {
+ err = f71808e_find(addrs[i]);
+ if (err == 0)
+ break;
+ }
+ if (i == ARRAY_SIZE(addrs))
+ return err;
+
+ return watchdog_init(addrs[i]);
+}
+
+static void __exit f71808e_exit(void)
+{
+ if (watchdog_is_running()) {
+ pr_warn("Watchdog timer still running, stopping it\n");
+ watchdog_stop();
+ }
+ misc_deregister(&watchdog_miscdev);
+ unregister_reboot_notifier(&watchdog_notifier);
+}
+
+MODULE_DESCRIPTION("F71808E Watchdog Driver");
+MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
+MODULE_LICENSE("GPL");
+
+module_init(f71808e_init);
+module_exit(f71808e_exit);