mv watchdog tree under drivers

move watchdog tree from drivers/char/watchdog to drivers/watchdog.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 824 insertions, 0 deletions

diff --git a/drivers/watchdog/pcwd_usb.c b/drivers/watchdog/pcwd_usb.c
new file mode 100644
index 00000000000..0f3fd6c9c35
--- /dev/null
+++ b/drivers/watchdog/pcwd_usb.c
@@ -0,0 +1,824 @@
+/*
+ *      Berkshire USB-PC Watchdog Card Driver
+ *
+ *      (c) Copyright 2004-2007 Wim Van Sebroeck <wim@iguana.be>.
+ *
+ *      Based on source code of the following authors:
+ *        Ken Hollis <kenji@bitgate.com>,
+ *        Alan Cox <alan@redhat.com>,
+ *        Matt Domsch <Matt_Domsch@dell.com>,
+ *        Rob Radez <rob@osinvestor.com>,
+ *        Greg Kroah-Hartman <greg@kroah.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.
+ *
+ *      Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
+ *      provide warranty for any of this software. This material is
+ *      provided "AS-IS" and at no charge.
+ *
+ *      Thanks also to Simon Machell at Berkshire Products Inc. for
+ *      providing the test hardware. More info is available at
+ *      http://www.berkprod.com/ or http://www.pcwatchdog.com/
+ */
+
+#include <linux/module.h>       /* For module specific items */
+#include <linux/moduleparam.h>  /* For new moduleparam's */
+#include <linux/types.h>        /* For standard types (like size_t) */
+#include <linux/errno.h>        /* For the -ENODEV/... values */
+#include <linux/kernel.h>       /* For printk/panic/... */
+#include <linux/delay.h>        /* For mdelay function */
+#include <linux/miscdevice.h>   /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
+#include <linux/watchdog.h>     /* For the watchdog specific items */
+#include <linux/notifier.h>     /* For notifier support */
+#include <linux/reboot.h>       /* For reboot_notifier stuff */
+#include <linux/init.h>         /* For __init/__exit/... */
+#include <linux/fs.h>           /* For file operations */
+#include <linux/usb.h>          /* For USB functions */
+#include <linux/slab.h>         /* For kmalloc, ... */
+#include <linux/mutex.h>        /* For mutex locking */
+#include <linux/hid.h>          /* For HID_REQ_SET_REPORT & HID_DT_REPORT */
+
+#include <asm/uaccess.h>        /* For copy_to_user/put_user/... */
+
+
+#ifdef CONFIG_USB_DEBUG
+        static int debug = 1;
+#else
+        static int debug;
+#endif
+
+/* Use our own dbg macro */
+#undef dbg
+#define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0)
+
+
+/* Module and Version Information */
+#define DRIVER_VERSION "1.02"
+#define DRIVER_DATE "21 Jan 2007"
+#define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
+#define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
+#define DRIVER_LICENSE "GPL"
+#define DRIVER_NAME "pcwd_usb"
+#define PFX DRIVER_NAME ": "
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE(DRIVER_LICENSE);
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS_MISCDEV(TEMP_MINOR);
+
+/* Module Parameters */
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+#define WATCHDOG_HEARTBEAT 0    /* default heartbeat = delay-time from dip-switches */
+static int heartbeat = WATCHDOG_HEARTBEAT;
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_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) ")");
+
+/* The vendor and product id's for the USB-PC Watchdog card */
+#define USB_PCWD_VENDOR_ID      0x0c98
+#define USB_PCWD_PRODUCT_ID     0x1140
+
+/* table of devices that work with this driver */
+static struct usb_device_id usb_pcwd_table [] = {
+        { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
+        { }                                     /* Terminating entry */
+};
+MODULE_DEVICE_TABLE (usb, usb_pcwd_table);
+
+/* according to documentation max. time to process a command for the USB
+ * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
+#define USB_COMMAND_TIMEOUT     250
+
+/* Watchdog's internal commands */
+#define CMD_READ_TEMP                   0x02    /* Read Temperature; Re-trigger Watchdog */
+#define CMD_TRIGGER                     CMD_READ_TEMP
+#define CMD_GET_STATUS                  0x04    /* Get Status Information */
+#define CMD_GET_FIRMWARE_VERSION        0x08    /* Get Firmware Version */
+#define CMD_GET_DIP_SWITCH_SETTINGS     0x0c    /* Get Dip Switch Settings */
+#define CMD_READ_WATCHDOG_TIMEOUT       0x18    /* Read Current Watchdog Time */
+#define CMD_WRITE_WATCHDOG_TIMEOUT      0x19    /* Write Current Watchdog Time */
+#define CMD_ENABLE_WATCHDOG             0x30    /* Enable / Disable Watchdog */
+#define CMD_DISABLE_WATCHDOG            CMD_ENABLE_WATCHDOG
+
+/* Watchdog's Dip Switch heartbeat values */
+static const int heartbeat_tbl [] = {
+        5,      /* OFF-OFF-OFF  =  5 Sec  */
+        10,     /* OFF-OFF-ON   = 10 Sec  */
+        30,     /* OFF-ON-OFF   = 30 Sec  */
+        60,     /* OFF-ON-ON    =  1 Min  */
+        300,    /* ON-OFF-OFF   =  5 Min  */
+        600,    /* ON-OFF-ON    = 10 Min  */
+        1800,   /* ON-ON-OFF    = 30 Min  */
+        3600,   /* ON-ON-ON     =  1 hour */
+};
+
+/* We can only use 1 card due to the /dev/watchdog restriction */
+static int cards_found;
+
+/* some internal variables */
+static unsigned long is_active;
+static char expect_release;
+
+/* Structure to hold all of our device specific stuff */
+struct usb_pcwd_private {
+        struct usb_device *     udev;                   /* save off the usb device pointer */
+        struct usb_interface *  interface;              /* the interface for this device */
+
+        unsigned int            interface_number;       /* the interface number used for cmd's */
+
+        unsigned char *         intr_buffer;            /* the buffer to intr data */
+        dma_addr_t              intr_dma;               /* the dma address for the intr buffer */
+        size_t                  intr_size;              /* the size of the intr buffer */
+        struct urb *            intr_urb;               /* the urb used for the intr pipe */
+
+        unsigned char           cmd_command;            /* The command that is reported back */
+        unsigned char           cmd_data_msb;           /* The data MSB that is reported back */
+        unsigned char           cmd_data_lsb;           /* The data LSB that is reported back */
+        atomic_t                cmd_received;           /* true if we received a report after a command */
+
+        int                     exists;                 /* Wether or not the device exists */
+        struct mutex            mtx;                    /* locks this structure */
+};
+static struct usb_pcwd_private *usb_pcwd_device;
+
+/* prevent races between open() and disconnect() */
+static DEFINE_MUTEX(disconnect_mutex);
+
+/* local function prototypes */
+static int usb_pcwd_probe       (struct usb_interface *interface, const struct usb_device_id *id);
+static void usb_pcwd_disconnect (struct usb_interface *interface);
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver usb_pcwd_driver = {
+        .name =         DRIVER_NAME,
+        .probe =        usb_pcwd_probe,
+        .disconnect =   usb_pcwd_disconnect,
+        .id_table =     usb_pcwd_table,
+};
+
+
+static void usb_pcwd_intr_done(struct urb *urb)
+{
+        struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context;
+        unsigned char *data = usb_pcwd->intr_buffer;
+        int retval;
+
+        switch (urb->status) {
+        case 0:                 /* success */
+                break;
+        case -ECONNRESET:       /* unlink */
+        case -ENOENT:
+        case -ESHUTDOWN:
+                /* this urb is terminated, clean up */
+                dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
+                return;
+        /* -EPIPE:  should clear the halt */
+        default:                /* error */
+                dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
+                goto resubmit;
+        }
+
+        dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
+                data[0], data[1], data[2]);
+
+        usb_pcwd->cmd_command  = data[0];
+        usb_pcwd->cmd_data_msb = data[1];
+        usb_pcwd->cmd_data_lsb = data[2];
+
+        /* notify anyone waiting that the cmd has finished */
+        atomic_set (&usb_pcwd->cmd_received, 1);
+
+resubmit:
+        retval = usb_submit_urb (urb, GFP_ATOMIC);
+        if (retval)
+                printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n",
+                        retval);
+}
+
+static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd,
+        unsigned char *msb, unsigned char *lsb)
+{
+        int got_response, count;
+        unsigned char buf[6];
+
+        /* We will not send any commands if the USB PCWD device does not exist */
+        if ((!usb_pcwd) || (!usb_pcwd->exists))
+                return -1;
+
+        /* The USB PC Watchdog uses a 6 byte report format. The board currently uses
+         * only 3 of the six bytes of the report. */
+        buf[0] = cmd;                   /* Byte 0 = CMD */
+        buf[1] = *msb;                  /* Byte 1 = Data MSB */
+        buf[2] = *lsb;                  /* Byte 2 = Data LSB */
+        buf[3] = buf[4] = buf[5] = 0;   /* All other bytes not used */
+
+        dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
+                buf[0], buf[1], buf[2]);
+
+        atomic_set (&usb_pcwd->cmd_received, 0);
+
+        if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
+                        HID_REQ_SET_REPORT, HID_DT_REPORT,
+                        0x0200, usb_pcwd->interface_number, buf, sizeof(buf),
+                        USB_COMMAND_TIMEOUT) != sizeof(buf)) {
+                dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb);
+        }
+        /* wait till the usb card processed the command,
+         * with a max. timeout of USB_COMMAND_TIMEOUT */
+        got_response = 0;
+        for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) {
+                mdelay(1);
+                if (atomic_read (&usb_pcwd->cmd_received))
+                        got_response = 1;
+        }
+
+        if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
+                /* read back response */
+                *msb = usb_pcwd->cmd_data_msb;
+                *lsb = usb_pcwd->cmd_data_lsb;
+        }
+
+        return got_response;
+}
+
+static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
+{
+        unsigned char msb = 0x00;
+        unsigned char lsb = 0x00;
+        int retval;
+
+        /* Enable Watchdog */
+        retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb);
+
+        if ((retval == 0) || (lsb == 0)) {
+                printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n");
+                return -1;
+        }
+
+        return 0;
+}
+
+static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
+{
+        unsigned char msb = 0xA5;
+        unsigned char lsb = 0xC3;
+        int retval;
+
+        /* Disable Watchdog */
+        retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb);
+
+        if ((retval == 0) || (lsb != 0)) {
+                printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
+                return -1;
+        }
+
+        return 0;
+}
+
+static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
+{
+        unsigned char dummy;
+
+        /* Re-trigger Watchdog */
+        usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
+
+        return 0;
+}
+
+static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
+{
+        unsigned char msb = t / 256;
+        unsigned char lsb = t % 256;
+
+        if ((t < 0x0001) || (t > 0xFFFF))
+                return -EINVAL;
+
+        /* Write new heartbeat to watchdog */
+        usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
+
+        heartbeat = t;
+        return 0;
+}
+
+static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature)
+{
+        unsigned char msb, lsb;
+
+        usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
+
+        /*
+         * Convert celsius to fahrenheit, since this was
+         * the decided 'standard' for this return value.
+         */
+        *temperature = (lsb * 9 / 5) + 32;
+
+        return 0;
+}
+
+static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left)
+{
+        unsigned char msb, lsb;
+
+        /* Read the time that's left before rebooting */
+        /* Note: if the board is not yet armed then we will read 0xFFFF */
+        usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
+
+        *time_left = (msb << 8) + lsb;
+
+        return 0;
+}
+
+/*
+ *      /dev/watchdog handling
+ */
+
+static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
+                              size_t len, loff_t *ppos)
+{
+        /* See if we got the magic character 'V' and reload the timer */
+        if (len) {
+                if (!nowayout) {
+                        size_t i;
+
+                        /* note: just in case someone wrote the magic character
+                         * five months ago... */
+                        expect_release = 0;
+
+                        /* scan to see whether or not we got the magic character */
+                        for (i = 0; i != len; i++) {
+                                char c;
+                                if(get_user(c, data+i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        expect_release = 42;
+                        }
+                }
+
+                /* someone wrote to us, we should reload the timer */
+                usb_pcwd_keepalive(usb_pcwd_device);
+        }
+        return len;
+}
+
+static int usb_pcwd_ioctl(struct inode *inode, struct file *file,
+                          unsigned int cmd, unsigned long arg)
+{
+        void __user *argp = (void __user *)arg;
+        int __user *p = argp;
+        static struct watchdog_info ident = {
+                .options =              WDIOF_KEEPALIVEPING |
+                                        WDIOF_SETTIMEOUT |
+                                        WDIOF_MAGICCLOSE,
+                .firmware_version =     1,
+                .identity =             DRIVER_NAME,
+        };
+
+        switch (cmd) {
+                case WDIOC_GETSUPPORT:
+                        return copy_to_user(argp, &ident,
+                                sizeof (ident)) ? -EFAULT : 0;
+
+                case WDIOC_GETSTATUS:
+                case WDIOC_GETBOOTSTATUS:
+                        return put_user(0, p);
+
+                case WDIOC_GETTEMP:
+                {
+                        int temperature;
+
+                        if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
+                                return -EFAULT;
+
+                        return put_user(temperature, p);
+                }
+
+                case WDIOC_KEEPALIVE:
+                        usb_pcwd_keepalive(usb_pcwd_device);
+                        return 0;
+
+                case WDIOC_SETOPTIONS:
+                {
+                        int new_options, retval = -EINVAL;
+
+                        if (get_user (new_options, p))
+                                return -EFAULT;
+
+                        if (new_options & WDIOS_DISABLECARD) {
+                                usb_pcwd_stop(usb_pcwd_device);
+                                retval = 0;
+                        }
+
+                        if (new_options & WDIOS_ENABLECARD) {
+                                usb_pcwd_start(usb_pcwd_device);
+                                retval = 0;
+                        }
+
+                        return retval;
+                }
+
+                case WDIOC_SETTIMEOUT:
+                {
+                        int new_heartbeat;
+
+                        if (get_user(new_heartbeat, p))
+                                return -EFAULT;
+
+                        if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
+                            return -EINVAL;
+
+                        usb_pcwd_keepalive(usb_pcwd_device);
+                        /* Fall */
+                }
+
+                case WDIOC_GETTIMEOUT:
+                        return put_user(heartbeat, p);
+
+                case WDIOC_GETTIMELEFT:
+                {
+                        int time_left;
+
+                        if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
+                                return -EFAULT;
+
+                        return put_user(time_left, p);
+                }
+
+                default:
+                        return -ENOTTY;
+        }
+}
+
+static int usb_pcwd_open(struct inode *inode, struct file *file)
+{
+        /* /dev/watchdog can only be opened once */
+        if (test_and_set_bit(0, &is_active))
+                return -EBUSY;
+
+        /* Activate */
+        usb_pcwd_start(usb_pcwd_device);
+        usb_pcwd_keepalive(usb_pcwd_device);
+        return nonseekable_open(inode, file);
+}
+
+static int usb_pcwd_release(struct inode *inode, struct file *file)
+{
+        /*
+         *      Shut off the timer.
+         */
+        if (expect_release == 42) {
+                usb_pcwd_stop(usb_pcwd_device);
+        } else {
+                printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+                usb_pcwd_keepalive(usb_pcwd_device);
+        }
+        expect_release = 0;
+        clear_bit(0, &is_active);
+        return 0;
+}
+
+/*
+ *      /dev/temperature handling
+ */
+
+static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
+                                size_t len, loff_t *ppos)
+{
+        int temperature;
+
+        if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
+                return -EFAULT;
+
+        if (copy_to_user(data, &temperature, 1))
+                return -EFAULT;
+
+        return 1;
+}
+
+static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
+{
+        return nonseekable_open(inode, file);
+}
+
+static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
+{
+        return 0;
+}
+
+/*
+ *      Notify system
+ */
+
+static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
+{
+        if (code==SYS_DOWN || code==SYS_HALT) {
+                /* Turn the WDT off */
+                usb_pcwd_stop(usb_pcwd_device);
+        }
+
+        return NOTIFY_DONE;
+}
+
+/*
+ *      Kernel Interfaces
+ */
+
+static const struct file_operations usb_pcwd_fops = {
+        .owner =        THIS_MODULE,
+        .llseek =       no_llseek,
+        .write =        usb_pcwd_write,
+        .ioctl =        usb_pcwd_ioctl,
+        .open =         usb_pcwd_open,
+        .release =      usb_pcwd_release,
+};
+
+static struct miscdevice usb_pcwd_miscdev = {
+        .minor =        WATCHDOG_MINOR,
+        .name =         "watchdog",
+        .fops =         &usb_pcwd_fops,
+};
+
+static const struct file_operations usb_pcwd_temperature_fops = {
+        .owner =        THIS_MODULE,
+        .llseek =       no_llseek,
+        .read =         usb_pcwd_temperature_read,
+        .open =         usb_pcwd_temperature_open,
+        .release =      usb_pcwd_temperature_release,
+};
+
+static struct miscdevice usb_pcwd_temperature_miscdev = {
+        .minor =        TEMP_MINOR,
+        .name =         "temperature",
+        .fops =         &usb_pcwd_temperature_fops,
+};
+
+static struct notifier_block usb_pcwd_notifier = {
+        .notifier_call =        usb_pcwd_notify_sys,
+};
+
+/**
+ *      usb_pcwd_delete
+ */
+static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd)
+{
+        usb_free_urb(usb_pcwd->intr_urb);
+        if (usb_pcwd->intr_buffer != NULL)
+                usb_buffer_free(usb_pcwd->udev, usb_pcwd->intr_size,
+                                usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
+        kfree (usb_pcwd);
+}
+
+/**
+ *      usb_pcwd_probe
+ *
+ *      Called by the usb core when a new device is connected that it thinks
+ *      this driver might be interested in.
+ */
+static int usb_pcwd_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+        struct usb_device *udev = interface_to_usbdev(interface);
+        struct usb_host_interface *iface_desc;
+        struct usb_endpoint_descriptor *endpoint;
+        struct usb_pcwd_private *usb_pcwd = NULL;
+        int pipe, maxp;
+        int retval = -ENOMEM;
+        int got_fw_rev;
+        unsigned char fw_rev_major, fw_rev_minor;
+        char fw_ver_str[20];
+        unsigned char option_switches, dummy;
+
+        cards_found++;
+        if (cards_found > 1) {
+                printk(KERN_ERR PFX "This driver only supports 1 device\n");
+                return -ENODEV;
+        }
+
+        /* get the active interface descriptor */
+        iface_desc = interface->cur_altsetting;
+
+        /* check out that we have a HID device */
+        if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
+                printk(KERN_ERR PFX "The device isn't a Human Interface Device\n");
+                return -ENODEV;
+        }
+
+        /* check out the endpoint: it has to be Interrupt & IN */
+        endpoint = &iface_desc->endpoint[0].desc;
+
+        if (!((endpoint->bEndpointAddress & USB_DIR_IN) &&
+             ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+                                == USB_ENDPOINT_XFER_INT))) {
+                /* we didn't find a Interrupt endpoint with direction IN */
+                printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n");
+                return -ENODEV;
+        }
+
+        /* get a handle to the interrupt data pipe */
+        pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
+        maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));
+
+        /* allocate memory for our device and initialize it */
+        usb_pcwd = kzalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL);
+        if (usb_pcwd == NULL) {
+                printk(KERN_ERR PFX "Out of memory\n");
+                goto error;
+        }
+
+        usb_pcwd_device = usb_pcwd;
+
+        mutex_init(&usb_pcwd->mtx);
+        usb_pcwd->udev = udev;
+        usb_pcwd->interface = interface;
+        usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
+        usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? le16_to_cpu(endpoint->wMaxPacketSize) : 8);
+
+        /* set up the memory buffer's */
+        if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma))) {
+                printk(KERN_ERR PFX "Out of memory\n");
+                goto error;
+        }
+
+        /* allocate the urb's */
+        usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
+        if (!usb_pcwd->intr_urb) {
+                printk(KERN_ERR PFX "Out of memory\n");
+                goto error;
+        }
+
+        /* initialise the intr urb's */
+        usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
+                        usb_pcwd->intr_buffer, usb_pcwd->intr_size,
+                        usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
+        usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
+        usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+        /* register our interrupt URB with the USB system */
+        if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
+                printk(KERN_ERR PFX "Problem registering interrupt URB\n");
+                retval = -EIO; /* failure */
+                goto error;
+        }
+
+        /* The device exists and can be communicated with */
+        usb_pcwd->exists = 1;
+
+        /* disable card */
+        usb_pcwd_stop(usb_pcwd);
+
+        /* Get the Firmware Version */
+        got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
+        if (got_fw_rev) {
+                sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
+        } else {
+                sprintf(fw_ver_str, "<card no answer>");
+        }
+
+        printk(KERN_INFO PFX "Found card (Firmware: %s) with temp option\n",
+                fw_ver_str);
+
+        /* Get switch settings */
+        usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, &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"));
+
+        /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
+        if (heartbeat == 0)
+                heartbeat = heartbeat_tbl[(option_switches & 0x07)];
+
+        /* Check that the heartbeat value is within it's range ; if not reset to the default */
+        if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
+                usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
+                printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
+                        WATCHDOG_HEARTBEAT);
+        }
+
+        retval = register_reboot_notifier(&usb_pcwd_notifier);
+        if (retval != 0) {
+                printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+                        retval);
+                goto error;
+        }
+
+        retval = misc_register(&usb_pcwd_temperature_miscdev);
+        if (retval != 0) {
+                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        TEMP_MINOR, retval);
+                goto err_out_unregister_reboot;
+        }
+
+        retval = misc_register(&usb_pcwd_miscdev);
+        if (retval != 0) {
+                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        WATCHDOG_MINOR, retval);
+                goto err_out_misc_deregister;
+        }
+
+        /* we can register the device now, as it is ready */
+        usb_set_intfdata (interface, usb_pcwd);
+
+        printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
+                heartbeat, nowayout);
+
+        return 0;
+
+err_out_misc_deregister:
+        misc_deregister(&usb_pcwd_temperature_miscdev);
+err_out_unregister_reboot:
+        unregister_reboot_notifier(&usb_pcwd_notifier);
+error:
+        if (usb_pcwd)
+                usb_pcwd_delete(usb_pcwd);
+        usb_pcwd_device = NULL;
+        return retval;
+}
+
+
+/**
+ *      usb_pcwd_disconnect
+ *
+ *      Called by the usb core when the device is removed from the system.
+ *
+ *      This routine guarantees that the driver will not submit any more urbs
+ *      by clearing dev->udev.
+ */
+static void usb_pcwd_disconnect(struct usb_interface *interface)
+{
+        struct usb_pcwd_private *usb_pcwd;
+
+        /* prevent races with open() */
+        mutex_lock(&disconnect_mutex);
+
+        usb_pcwd = usb_get_intfdata (interface);
+        usb_set_intfdata (interface, NULL);
+
+        mutex_lock(&usb_pcwd->mtx);
+
+        /* Stop the timer before we leave */
+        if (!nowayout)
+                usb_pcwd_stop(usb_pcwd);
+
+        /* We should now stop communicating with the USB PCWD device */
+        usb_pcwd->exists = 0;
+
+        /* Deregister */
+        misc_deregister(&usb_pcwd_miscdev);
+        misc_deregister(&usb_pcwd_temperature_miscdev);
+        unregister_reboot_notifier(&usb_pcwd_notifier);
+
+        mutex_unlock(&usb_pcwd->mtx);
+
+        /* Delete the USB PCWD device */
+        usb_pcwd_delete(usb_pcwd);
+
+        cards_found--;
+
+        mutex_unlock(&disconnect_mutex);
+
+        printk(KERN_INFO PFX "USB PC Watchdog disconnected\n");
+}
+
+
+
+/**
+ *      usb_pcwd_init
+ */
+static int __init usb_pcwd_init(void)
+{
+        int result;
+
+        /* register this driver with the USB subsystem */
+        result = usb_register(&usb_pcwd_driver);
+        if (result) {
+                printk(KERN_ERR PFX "usb_register failed. Error number %d\n",
+                    result);
+                return result;
+        }
+
+        printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n");
+        return 0;
+}
+
+
+/**
+ *      usb_pcwd_exit
+ */
+static void __exit usb_pcwd_exit(void)
+{
+        /* deregister this driver with the USB subsystem */
+        usb_deregister(&usb_pcwd_driver);
+}
+
+
+module_init (usb_pcwd_init);
+module_exit (usb_pcwd_exit);