lkml.org 
[lkml]   [2010]   [Mar]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 3/3] [RFC] watchdog: f71808e_wdt: new watchdog driver for Fintek F71808E
    Date
    Add a new watchdog driver for the Fintek F71808E Super I/O chip.
    ---
    drivers/watchdog/Kconfig | 11 +
    drivers/watchdog/Makefile | 1 +
    drivers/watchdog/f71808e_wdt.c | 726 ++++++++++++++++++++++++++++++++++++++++
    3 files changed, 738 insertions(+), 0 deletions(-)
    create mode 100644 drivers/watchdog/f71808e_wdt.c

    diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
    index bdcdbd5..653896f 100644
    --- a/drivers/watchdog/Kconfig
    +++ b/drivers/watchdog/Kconfig
    @@ -382,6 +382,17 @@ config ALIM7101_WDT

    Most people will say N.

    +config F71808E_WDT
    + tristate "Fintek F71808E Watchdog"
    + depends on X86 && EXPERIMENTAL
    + help
    + This is the driver for the hardware watchdog on the Fintek
    + F71808E Super I/O chip.
    +
    + You can compile this driver directly into the kernel, or use
    + it as a module. The module will be called f71808e_wdt.
    +
    +
    config GEODE_WDT
    tristate "AMD Geode CS5535/CS5536 Watchdog"
    depends on CS5535_MFGPT
    diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
    index 5e3cb95..e2f308d 100644
    --- a/drivers/watchdog/Makefile
    +++ b/drivers/watchdog/Makefile
    @@ -65,6 +65,7 @@ obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
    obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o
    obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
    obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
    +obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o
    obj-$(CONFIG_GEODE_WDT) += geodewdt.o
    obj-$(CONFIG_SC520_WDT) += sc520_wdt.o
    obj-$(CONFIG_SBC_FITPC2_WATCHDOG) += sbc_fitpc2_wdt.o
    diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c
    new file mode 100644
    index 0000000..7d547a9
    --- /dev/null
    +++ b/drivers/watchdog/f71808e_wdt.c
    @@ -0,0 +1,726 @@
    +/***************************************************************************
    + * 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. *
    + ***************************************************************************/
    +
    +#include <linux/err.h>
    +#include <linux/fs.h>
    +#include <linux/init.h>
    +#include <linux/io.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_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_F71882_ID 0x0541 /* Chipset ID */
    +#define SIO_F71889_ID 0x0723 /* Chipset ID */
    +
    +#define F71882FG_REG_START 0x01
    +
    +#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 */
    +
    +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 = 60; /* 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 int 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, f71882fg, f71889fg };
    +
    +static const char *f71808e_names[] = {
    + "f71808fg",
    + "f71858fg",
    + "f71862fg",
    + "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)) {
    + printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n",
    + (int)base);
    + return -EBUSY;
    + }
    +
    + /* according to the datasheet the key must be send 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) {
    + printk(KERN_ERR DRVNAME ": 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 {
    + printk(KERN_ERR DRVNAME ": 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;
    +
    + 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.timeout);
    +
    + superio_exit(watchdog.sioaddr);
    +
    +exit_unlock:
    + mutex_unlock(&watchdog.lock);
    + return err;
    +}
    +
    +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;
    +
    + /* Watchdog pin configuration */
    + switch (watchdog.type) {
    + case f71808fg:
    + /* Set ping 21 to GPIO23/WDTRST#, then to WDTRST# */
    + superio_clear_bit(watchdog.sioaddr, 0x2a, 3);
    + superio_clear_bit(watchdog.sioaddr, 0x2b, 3);
    + 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_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;
    +}
    +
    +/* /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();
    + printk(KERN_CRIT DRVNAME
    + ": 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;
    +
    + 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) {
    + printk(KERN_ERR DRVNAME
    + ": cannot register miscdev on minor=%d\n",
    + watchdog_miscdev.minor);
    + goto exit_reboot;
    + }
    +
    + if (start_withtimeout) {
    + if (start_withtimeout <= 0
    + || start_withtimeout > max_timeout) {
    + printk(KERN_ERR DRVNAME
    + ": starting timeout out of range\n");
    + err = -EINVAL;
    + goto exit_miscdev;
    + }
    +
    + err = watchdog_start();
    + if (err) {
    + printk(KERN_ERR DRVNAME
    + ": cannot start watchdog timer\n");
    + goto exit_miscdev;
    + }
    +
    + mutex_lock(&watchdog.lock);
    + err = superio_enter(sioaddr);
    + if (err)
    + goto exit_unlock;
    +
    + 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);
    +
    + printk(KERN_INFO DRVNAME
    + ": 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(DRVNAME ": Not a Fintek device\n");
    + 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:
    + case SIO_F71882_ID:
    + case SIO_F71889_ID:
    + /* These have a watchdog, though it isn't implemented (yet). */
    + err = -ENOSYS;
    + goto exit;
    + case SIO_F71858_ID:
    + /* Confirmed (by datasheet) not to have a watchdog. */
    + err = -ENODEV;
    + goto exit;
    + default:
    + printk(KERN_INFO DRVNAME ": Unrecognized Fintek device: %04x\n",
    + (unsigned int)devid);
    + err = -ENODEV;
    + goto exit;
    + }
    +
    + printk(KERN_INFO DRVNAME ": 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)
    +{
    + 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);
    --
    1.6.4.4


    \
     
     \ /
      Last update: 2010-03-25 14:21    [W:4.361 / U:0.400 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site