Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 926 insertions, 0 deletions

diff --git a/drivers/char/watchdog/pcwd.c b/drivers/char/watchdog/pcwd.c
new file mode 100644
index 000000000000..592dca108866
--- /dev/null
+++ b/drivers/char/watchdog/pcwd.c
@@ -0,0 +1,926 @@
+/*
+ * PC Watchdog Driver
+ * by Ken Hollis (khollis@bitgate.com)
+ *
+ * Permission granted from Simon Machell (73244.1270@compuserve.com)
+ * Written for the Linux Kernel, and GPLed by Ken Hollis
+ *
+ * 960107       Added request_region routines, modulized the whole thing.
+ * 960108       Fixed end-of-file pointer (Thanks to Dan Hollis), added
+ *              WD_TIMEOUT define.
+ * 960216       Added eof marker on the file, and changed verbose messages.
+ * 960716       Made functional and cosmetic changes to the source for
+ *              inclusion in Linux 2.0.x kernels, thanks to Alan Cox.
+ * 960717       Removed read/seek routines, replaced with ioctl.  Also, added
+ *              check_region command due to Alan's suggestion.
+ * 960821       Made changes to compile in newer 2.0.x kernels.  Added
+ *              "cold reboot sense" entry.
+ * 960825       Made a few changes to code, deleted some defines and made
+ *              typedefs to replace them.  Made heartbeat reset only available
+ *              via ioctl, and removed the write routine.
+ * 960828       Added new items for PC Watchdog Rev.C card.
+ * 960829       Changed around all of the IOCTLs, added new features,
+ *              added watchdog disable/re-enable routines.  Added firmware
+ *              version reporting.  Added read routine for temperature.
+ *              Removed some extra defines, added an autodetect Revision
+ *              routine.
+ * 961006       Revised some documentation, fixed some cosmetic bugs.  Made
+ *              drivers to panic the system if it's overheating at bootup.
+ * 961118       Changed some verbiage on some of the output, tidied up
+ *              code bits, and added compatibility to 2.1.x.
+ * 970912       Enabled board on open and disable on close.
+ * 971107       Took account of recent VFS changes (broke read).
+ * 971210       Disable board on initialisation in case board already ticking.
+ * 971222       Changed open/close for temperature handling
+ *              Michael Meskes <meskes@debian.org>.
+ * 980112       Used minor numbers from include/linux/miscdevice.h
+ * 990403       Clear reset status after reading control status register in
+ *              pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>]
+ * 990605       Made changes to code to support Firmware 1.22a, added
+ *              fairly useless proc entry.
+ * 990610       removed said useless proc code for the merge <alan>
+ * 000403       Removed last traces of proc code. <davej>
+ * 011214       Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
+ *              Added timeout module option to override default
+ */
+
+/*
+ *      A bells and whistles driver is available from http://www.pcwd.de/
+ *      More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/config.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/reboot.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#define WD_VER                  "1.16 (06/12/2004)"
+#define PFX                     "pcwd: "
+
+/*
+ * It should be noted that PCWD_REVISION_B was removed because A and B
+ * are essentially the same types of card, with the exception that B
+ * has temperature reporting.  Since I didn't receive a Rev.B card,
+ * the Rev.B card is not supported.  (It's a good thing too, as they
+ * are no longer in production.)
+ */
+#define PCWD_REVISION_A         1
+#define PCWD_REVISION_C         2
+
+/*
+ * These are the defines that describe the control status bits for the
+ * PC Watchdog card, revision A.
+ */
+#define WD_WDRST                0x01    /* Previously reset state */
+#define WD_T110                 0x02    /* Temperature overheat sense */
+#define WD_HRTBT                0x04    /* Heartbeat sense */
+#define WD_RLY2                 0x08    /* External relay triggered */
+#define WD_SRLY2                0x80    /* Software external relay triggered */
+
+/*
+ * These are the defines that describe the control status bits for the
+ * PC Watchdog card, revision C.
+ */
+#define WD_REVC_WTRP            0x01    /* Watchdog Trip status */
+#define WD_REVC_HRBT            0x02    /* Watchdog Heartbeat */
+#define WD_REVC_TTRP            0x04    /* Temperature Trip status */
+
+/* max. time we give an ISA watchdog card to process a command */
+/* 500ms for each 4 bit response (according to spec.) */
+#define ISA_COMMAND_TIMEOUT     1000
+
+/* Watchdog's internal commands */
+#define CMD_ISA_IDLE                    0x00
+#define CMD_ISA_VERSION_INTEGER         0x01
+#define CMD_ISA_VERSION_TENTH           0x02
+#define CMD_ISA_VERSION_HUNDRETH        0x03
+#define CMD_ISA_VERSION_MINOR           0x04
+#define CMD_ISA_SWITCH_SETTINGS         0x05
+#define CMD_ISA_DELAY_TIME_2SECS        0x0A
+#define CMD_ISA_DELAY_TIME_4SECS        0x0B
+#define CMD_ISA_DELAY_TIME_8SECS        0x0C
+
+/*
+ * We are using an kernel timer to do the pinging of the watchdog
+ * every ~500ms. We try to set the internal heartbeat of the
+ * watchdog to 2 ms.
+ */
+
+#define WDT_INTERVAL (HZ/2+1)
+
+/* We can only use 1 card due to the /dev/watchdog restriction */
+static int cards_found;
+
+/* internal variables */
+static atomic_t open_allowed = ATOMIC_INIT(1);
+static char expect_close;
+static struct timer_list timer;
+static unsigned long next_heartbeat;
+static int temp_panic;
+static int revision;                    /* The card's revision */
+static int supports_temp;               /* Wether or not the card has a temperature device */
+static int command_mode;                /* Wether or not the card is in command mode */
+static int initial_status;              /* The card's boot status */
+static int current_readport;            /* The cards I/O address */
+static spinlock_t io_lock;
+
+/* module parameters */
+#define WATCHDOG_HEARTBEAT 60           /* 60 sec default heartbeat */
+static int heartbeat = WATCHDOG_HEARTBEAT;
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+/*
+ *      Internal functions
+ */
+
+static int send_isa_command(int cmd)
+{
+        int i;
+        int control_status;
+        int port0, last_port0;  /* Double read for stabilising */
+
+        /* The WCMD bit must be 1 and the command is only 4 bits in size */
+        control_status = (cmd & 0x0F) | 0x80;
+        outb_p(control_status, current_readport + 2);
+        udelay(ISA_COMMAND_TIMEOUT);
+
+        port0 = inb_p(current_readport);
+        for (i = 0; i < 25; ++i) {
+                last_port0 = port0;
+                port0 = inb_p(current_readport);
+
+                if (port0 == last_port0)
+                        break;  /* Data is stable */
+
+                udelay (250);
+        }
+
+        return port0;
+}
+
+static int set_command_mode(void)
+{
+        int i, found=0, count=0;
+
+        /* Set the card into command mode */
+        spin_lock(&io_lock);
+        while ((!found) && (count < 3)) {
+                i = send_isa_command(CMD_ISA_IDLE);
+
+                if (i == 0x00)
+                        found = 1;
+                else if (i == 0xF3) {
+                        /* Card does not like what we've done to it */
+                        outb_p(0x00, current_readport + 2);
+                        udelay(1200);   /* Spec says wait 1ms */
+                        outb_p(0x00, current_readport + 2);
+                        udelay(ISA_COMMAND_TIMEOUT);
+                }
+                count++;
+        }
+        spin_unlock(&io_lock);
+        command_mode = found;
+
+        return(found);
+}
+
+static void unset_command_mode(void)
+{
+        /* Set the card into normal mode */
+        spin_lock(&io_lock);
+        outb_p(0x00, current_readport + 2);
+        udelay(ISA_COMMAND_TIMEOUT);
+        spin_unlock(&io_lock);
+
+        command_mode = 0;
+}
+
+static void pcwd_timer_ping(unsigned long data)
+{
+        int wdrst_stat;
+
+        /* If we got a heartbeat pulse within the WDT_INTERVAL
+         * we agree to ping the WDT */
+        if(time_before(jiffies, next_heartbeat)) {
+                /* Ping the watchdog */
+                spin_lock(&io_lock);
+                if (revision == PCWD_REVISION_A) {
+                        /*  Rev A cards are reset by setting the WD_WDRST bit in register 1 */
+                        wdrst_stat = inb_p(current_readport);
+                        wdrst_stat &= 0x0F;
+                        wdrst_stat |= WD_WDRST;
+
+                        outb_p(wdrst_stat, current_readport + 1);
+                } else {
+                        /* Re-trigger watchdog by writing to port 0 */
+                        outb_p(0x00, current_readport);
+                }
+
+                /* Re-set the timer interval */
+                mod_timer(&timer, jiffies + WDT_INTERVAL);
+
+                spin_unlock(&io_lock);
+        } else {
+                printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
+        }
+}
+
+static int pcwd_start(void)
+{
+        int stat_reg;
+
+        next_heartbeat = jiffies + (heartbeat * HZ);
+
+        /* Start the timer */
+        mod_timer(&timer, jiffies + WDT_INTERVAL);
+
+        /* Enable the port */
+        if (revision == PCWD_REVISION_C) {
+                spin_lock(&io_lock);
+                outb_p(0x00, current_readport + 3);
+                udelay(ISA_COMMAND_TIMEOUT);
+                stat_reg = inb_p(current_readport + 2);
+                spin_unlock(&io_lock);
+                if (stat_reg & 0x10) {
+                        printk(KERN_INFO PFX "Could not start watchdog\n");
+                        return -EIO;
+                }
+        }
+        return 0;
+}
+
+static int pcwd_stop(void)
+{
+        int stat_reg;
+
+        /* Stop the timer */
+        del_timer(&timer);
+
+        /*  Disable the board  */
+        if (revision == PCWD_REVISION_C) {
+                spin_lock(&io_lock);
+                outb_p(0xA5, current_readport + 3);
+                udelay(ISA_COMMAND_TIMEOUT);
+                outb_p(0xA5, current_readport + 3);
+                udelay(ISA_COMMAND_TIMEOUT);
+                stat_reg = inb_p(current_readport + 2);
+                spin_unlock(&io_lock);
+                if ((stat_reg & 0x10) == 0) {
+                        printk(KERN_INFO PFX "Could not stop watchdog\n");
+                        return -EIO;
+                }
+        }
+        return 0;
+}
+
+static int pcwd_keepalive(void)
+{
+        /* user land ping */
+        next_heartbeat = jiffies + (heartbeat * HZ);
+        return 0;
+}
+
+static int pcwd_set_heartbeat(int t)
+{
+        if ((t < 2) || (t > 7200)) /* arbitrary upper limit */
+                return -EINVAL;
+
+        heartbeat = t;
+        return 0;
+}
+
+static int pcwd_get_status(int *status)
+{
+        int card_status;
+
+        *status=0;
+        spin_lock(&io_lock);
+        if (revision == PCWD_REVISION_A)
+                /* Rev A cards return status information from
+                 * the base register, which is used for the
+                 * temperature in other cards. */
+                card_status = inb(current_readport);
+        else {
+                /* Rev C cards return card status in the base
+                 * address + 1 register. And use different bits
+                 * to indicate a card initiated reset, and an
+                 * over-temperature condition. And the reboot
+                 * status can be reset. */
+                card_status = inb(current_readport + 1);
+        }
+        spin_unlock(&io_lock);
+
+        if (revision == PCWD_REVISION_A) {
+                if (card_status & WD_WDRST)
+                        *status |= WDIOF_CARDRESET;
+
+                if (card_status & WD_T110) {
+                        *status |= WDIOF_OVERHEAT;
+                        if (temp_panic) {
+                                printk (KERN_INFO PFX "Temperature overheat trip!\n");
+                                machine_power_off();
+                        }
+                }
+        } else {
+                if (card_status & WD_REVC_WTRP)
+                        *status |= WDIOF_CARDRESET;
+
+                if (card_status & WD_REVC_TTRP) {
+                        *status |= WDIOF_OVERHEAT;
+                        if (temp_panic) {
+                                printk (KERN_INFO PFX "Temperature overheat trip!\n");
+                                machine_power_off();
+                        }
+                }
+        }
+
+        return 0;
+}
+
+static int pcwd_clear_status(void)
+{
+        if (revision == PCWD_REVISION_C) {
+                spin_lock(&io_lock);
+                outb_p(0x00, current_readport + 1); /* clear reset status */
+                spin_unlock(&io_lock);
+        }
+        return 0;
+}
+
+static int pcwd_get_temperature(int *temperature)
+{
+        /* check that port 0 gives temperature info and no command results */
+        if (command_mode)
+                return -1;
+
+        *temperature = 0;
+        if (!supports_temp)
+                return -ENODEV;
+
+        /*
+         * Convert celsius to fahrenheit, since this was
+         * the decided 'standard' for this return value.
+         */
+        spin_lock(&io_lock);
+        *temperature = ((inb(current_readport)) * 9 / 5) + 32;
+        spin_unlock(&io_lock);
+
+        return 0;
+}
+
+/*
+ *      /dev/watchdog handling
+ */
+
+static int pcwd_ioctl(struct inode *inode, struct file *file,
+                      unsigned int cmd, unsigned long arg)
+{
+        int rv;
+        int status;
+        int temperature;
+        int new_heartbeat;
+        int __user *argp = (int __user *)arg;
+        static struct watchdog_info ident = {
+                .options =              WDIOF_OVERHEAT |
+                                        WDIOF_CARDRESET |
+                                        WDIOF_KEEPALIVEPING |
+                                        WDIOF_SETTIMEOUT |
+                                        WDIOF_MAGICCLOSE,
+                .firmware_version =     1,
+                .identity =             "PCWD",
+        };
+
+        switch(cmd) {
+        default:
+                return -ENOIOCTLCMD;
+
+        case WDIOC_GETSUPPORT:
+                if(copy_to_user(argp, &ident, sizeof(ident)))
+                        return -EFAULT;
+                return 0;
+
+        case WDIOC_GETSTATUS:
+                pcwd_get_status(&status);
+                return put_user(status, argp);
+
+        case WDIOC_GETBOOTSTATUS:
+                return put_user(initial_status, argp);
+
+        case WDIOC_GETTEMP:
+                if (pcwd_get_temperature(&temperature))
+                        return -EFAULT;
+
+                return put_user(temperature, argp);
+
+        case WDIOC_SETOPTIONS:
+                if (revision == PCWD_REVISION_C)
+                {
+                        if(copy_from_user(&rv, argp, sizeof(int)))
+                                return -EFAULT;
+
+                        if (rv & WDIOS_DISABLECARD)
+                        {
+                                return pcwd_stop();
+                        }
+
+                        if (rv & WDIOS_ENABLECARD)
+                        {
+                                return pcwd_start();
+                        }
+
+                        if (rv & WDIOS_TEMPPANIC)
+                        {
+                                temp_panic = 1;
+                        }
+                }
+                return -EINVAL;
+
+        case WDIOC_KEEPALIVE:
+                pcwd_keepalive();
+                return 0;
+
+        case WDIOC_SETTIMEOUT:
+                if (get_user(new_heartbeat, argp))
+                        return -EFAULT;
+
+                if (pcwd_set_heartbeat(new_heartbeat))
+                        return -EINVAL;
+
+                pcwd_keepalive();
+                /* Fall */
+
+        case WDIOC_GETTIMEOUT:
+                return put_user(heartbeat, argp);
+        }
+
+        return 0;
+}
+
+static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len,
+                          loff_t *ppos)
+{
+        if (len) {
+                if (!nowayout) {
+                        size_t i;
+
+                        /* In case it was set long ago */
+                        expect_close = 0;
+
+                        for (i = 0; i != len; i++) {
+                                char c;
+
+                                if (get_user(c, buf + i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        expect_close = 42;
+                        }
+                }
+                pcwd_keepalive();
+        }
+        return len;
+}
+
+static int pcwd_open(struct inode *inode, struct file *file)
+{
+        if (!atomic_dec_and_test(&open_allowed) ) {
+                atomic_inc( &open_allowed );
+                return -EBUSY;
+        }
+
+        if (nowayout)
+                __module_get(THIS_MODULE);
+
+        /* Activate */
+        pcwd_start();
+        pcwd_keepalive();
+        return nonseekable_open(inode, file);
+}
+
+static int pcwd_close(struct inode *inode, struct file *file)
+{
+        if (expect_close == 42) {
+                pcwd_stop();
+        } else {
+                printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+                pcwd_keepalive();
+        }
+        expect_close = 0;
+        atomic_inc( &open_allowed );
+        return 0;
+}
+
+/*
+ *      /dev/temperature handling
+ */
+
+static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count,
+                         loff_t *ppos)
+{
+        int temperature;
+
+        if (pcwd_get_temperature(&temperature))
+                return -EFAULT;
+
+        if (copy_to_user(buf, &temperature, 1))
+                return -EFAULT;
+
+        return 1;
+}
+
+static int pcwd_temp_open(struct inode *inode, struct file *file)
+{
+        if (!supports_temp)
+                return -ENODEV;
+
+        return nonseekable_open(inode, file);
+}
+
+static int pcwd_temp_close(struct inode *inode, struct file *file)
+{
+        return 0;
+}
+
+/*
+ *      Notify system
+ */
+
+static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+{
+        if (code==SYS_DOWN || code==SYS_HALT) {
+                /* Turn the WDT off */
+                pcwd_stop();
+        }
+
+        return NOTIFY_DONE;
+}
+
+/*
+ *      Kernel Interfaces
+ */
+
+static struct file_operations pcwd_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = pcwd_write,
+        .ioctl          = pcwd_ioctl,
+        .open           = pcwd_open,
+        .release        = pcwd_close,
+};
+
+static struct miscdevice pcwd_miscdev = {
+        .minor =        WATCHDOG_MINOR,
+        .name =         "watchdog",
+        .fops =         &pcwd_fops,
+};
+
+static struct file_operations pcwd_temp_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .read           = pcwd_temp_read,
+        .open           = pcwd_temp_open,
+        .release        = pcwd_temp_close,
+};
+
+static struct miscdevice temp_miscdev = {
+        .minor =        TEMP_MINOR,
+        .name =         "temperature",
+        .fops =         &pcwd_temp_fops,
+};
+
+static struct notifier_block pcwd_notifier = {
+        .notifier_call =        pcwd_notify_sys,
+};
+
+/*
+ *      Init & exit routines
+ */
+
+static inline void get_support(void)
+{
+        if (inb(current_readport) != 0xF0)
+                supports_temp = 1;
+}
+
+static inline int get_revision(void)
+{
+        int r = PCWD_REVISION_C;
+
+        spin_lock(&io_lock);
+        /* REV A cards use only 2 io ports; test
+         * presumes a floating bus reads as 0xff. */
+        if ((inb(current_readport + 2) == 0xFF) ||
+            (inb(current_readport + 3) == 0xFF))
+                r=PCWD_REVISION_A;
+        spin_unlock(&io_lock);
+
+        return r;
+}
+
+static inline char *get_firmware(void)
+{
+        int one, ten, hund, minor;
+        char *ret;
+
+        ret = kmalloc(6, GFP_KERNEL);
+        if(ret == NULL)
+                return NULL;
+
+        if (set_command_mode()) {
+                one = send_isa_command(CMD_ISA_VERSION_INTEGER);
+                ten = send_isa_command(CMD_ISA_VERSION_TENTH);
+                hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH);
+                minor = send_isa_command(CMD_ISA_VERSION_MINOR);
+                sprintf(ret, "%c.%c%c%c", one, ten, hund, minor);
+        }
+        else
+                sprintf(ret, "ERROR");
+
+        unset_command_mode();
+        return(ret);
+}
+
+static inline int get_option_switches(void)
+{
+        int rv=0;
+
+        if (set_command_mode()) {
+                /* Get switch settings */
+                rv = send_isa_command(CMD_ISA_SWITCH_SETTINGS);
+        }
+
+        unset_command_mode();
+        return(rv);
+}
+
+static int __devinit pcwatchdog_init(int base_addr)
+{
+        int ret;
+        char *firmware;
+        int option_switches;
+
+        cards_found++;
+        if (cards_found == 1)
+                printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER);
+
+        if (cards_found > 1) {
+                printk(KERN_ERR PFX "This driver only supports 1 device\n");
+                return -ENODEV;
+        }
+
+        if (base_addr == 0x0000) {
+                printk(KERN_ERR PFX "No I/O-Address for card detected\n");
+                return -ENODEV;
+        }
+        current_readport = base_addr;
+
+        /* Check card's revision */
+        revision = get_revision();
+
+        if (!request_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
+                printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
+                        current_readport);
+                current_readport = 0x0000;
+                return -EIO;
+        }
+
+        /* Initial variables */
+        supports_temp = 0;
+        temp_panic = 0;
+        initial_status = 0x0000;
+
+        /* get the boot_status */
+        pcwd_get_status(&initial_status);
+
+        /* clear the "card caused reboot" flag */
+        pcwd_clear_status();
+
+        init_timer(&timer);
+        timer.function = pcwd_timer_ping;
+        timer.data = 0;
+
+        /*  Disable the board  */
+        pcwd_stop();
+
+        /*  Check whether or not the card supports the temperature device */
+        get_support();
+
+        /* Get some extra info from the hardware (in command/debug/diag mode) */
+        if (revision == PCWD_REVISION_A)
+                printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", current_readport);
+        else if (revision == PCWD_REVISION_C) {
+                firmware = get_firmware();
+                printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
+                        current_readport, firmware);
+                kfree(firmware);
+                option_switches = get_option_switches();
+                printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
+                        option_switches,
+                        ((option_switches & 0x10) ? "ON" : "OFF"),
+                        ((option_switches & 0x08) ? "ON" : "OFF"));
+
+                /* Reprogram internal heartbeat to 2 seconds */
+                if (set_command_mode()) {
+                        send_isa_command(CMD_ISA_DELAY_TIME_2SECS);
+                        unset_command_mode();
+                }
+        } else {
+                /* Should NEVER happen, unless get_revision() fails. */
+                printk(KERN_INFO PFX "Unable to get revision\n");
+                release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
+                current_readport = 0x0000;
+                return -1;
+        }
+
+        if (supports_temp)
+                printk(KERN_INFO PFX "Temperature Option Detected\n");
+
+        if (initial_status & WDIOF_CARDRESET)
+                printk(KERN_INFO PFX "Previous reboot was caused by the card\n");
+
+        if (initial_status & WDIOF_OVERHEAT) {
+                printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n");
+                printk(KERN_EMERG PFX "CPU Overheat\n");
+        }
+
+        if (initial_status == 0)
+                printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
+
+        /* Check that the heartbeat value is within it's range ; if not reset to the default */
+        if (pcwd_set_heartbeat(heartbeat)) {
+                pcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
+                printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n",
+                        WATCHDOG_HEARTBEAT);
+        }
+
+        ret = register_reboot_notifier(&pcwd_notifier);
+        if (ret) {
+                printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+                        ret);
+                release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
+                current_readport = 0x0000;
+                return ret;
+        }
+
+        if (supports_temp) {
+                ret = misc_register(&temp_miscdev);
+                if (ret) {
+                        printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                                TEMP_MINOR, ret);
+                        unregister_reboot_notifier(&pcwd_notifier);
+                        release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
+                        current_readport = 0x0000;
+                        return ret;
+                }
+        }
+
+        ret = misc_register(&pcwd_miscdev);
+        if (ret) {
+                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        WATCHDOG_MINOR, ret);
+                if (supports_temp)
+                        misc_deregister(&temp_miscdev);
+                unregister_reboot_notifier(&pcwd_notifier);
+                release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
+                current_readport = 0x0000;
+                return ret;
+        }
+
+        printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
+                heartbeat, nowayout);
+
+        return 0;
+}
+
+static void __devexit pcwatchdog_exit(void)
+{
+        /*  Disable the board  */
+        if (!nowayout)
+                pcwd_stop();
+
+        /* Deregister */
+        misc_deregister(&pcwd_miscdev);
+        if (supports_temp)
+                misc_deregister(&temp_miscdev);
+        unregister_reboot_notifier(&pcwd_notifier);
+        release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
+        current_readport = 0x0000;
+}
+
+/*
+ *  The ISA cards have a heartbeat bit in one of the registers, which
+ *  register is card dependent.  The heartbeat bit is monitored, and if
+ *  found, is considered proof that a Berkshire card has been found.
+ *  The initial rate is once per second at board start up, then twice
+ *  per second for normal operation.
+ */
+static int __init pcwd_checkcard(int base_addr)
+{
+        int port0, last_port0;  /* Reg 0, in case it's REV A */
+        int port1, last_port1;  /* Register 1 for REV C cards */
+        int i;
+        int retval;
+
+        if (!request_region (base_addr, 4, "PCWD")) {
+                printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr);
+                return 0;
+        }
+
+        retval = 0;
+
+        port0 = inb_p(base_addr);       /* For REV A boards */
+        port1 = inb_p(base_addr + 1);   /* For REV C boards */
+        if (port0 != 0xff || port1 != 0xff) {
+                /* Not an 'ff' from a floating bus, so must be a card! */
+                for (i = 0; i < 4; ++i) {
+
+                        msleep(500);
+
+                        last_port0 = port0;
+                        last_port1 = port1;
+
+                        port0 = inb_p(base_addr);
+                        port1 = inb_p(base_addr + 1);
+
+                        /* Has either hearbeat bit changed?  */
+                        if ((port0 ^ last_port0) & WD_HRTBT ||
+                            (port1 ^ last_port1) & WD_REVC_HRBT) {
+                                retval = 1;
+                                break;
+                        }
+                }
+        }
+        release_region (base_addr, 4);
+
+        return retval;
+}
+
+/*
+ * These are the auto-probe addresses available.
+ *
+ * Revision A only uses ports 0x270 and 0x370.  Revision C introduced 0x350.
+ * Revision A has an address range of 2 addresses, while Revision C has 4.
+ */
+static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
+
+static int __init pcwd_init_module(void)
+{
+        int i, found = 0;
+
+        spin_lock_init(&io_lock);
+
+        for (i = 0; pcwd_ioports[i] != 0; i++) {
+                if (pcwd_checkcard(pcwd_ioports[i])) {
+                        if (!(pcwatchdog_init(pcwd_ioports[i])))
+                                found++;
+                }
+        }
+
+        if (!found) {
+                printk (KERN_INFO PFX "No card detected, or port not available\n");
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static void __exit pcwd_cleanup_module(void)
+{
+        if (current_readport)
+                pcwatchdog_exit();
+        return;
+}
+
+module_init(pcwd_init_module);
+module_exit(pcwd_cleanup_module);
+
+MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>");
+MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS_MISCDEV(TEMP_MINOR);