--- /dev/null
+/*
+ * 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@lxorguk.ukuu.org.uk>,
+ * 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/
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#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 struct miscdevice */
+#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 <linux/uaccess.h> /* For copy_to_user/put_user/... */
+
+
+/* Module and Version Information */
+#define DRIVER_VERSION "1.02"
+#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"
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE(DRIVER_LICENSE);
+
+#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 bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 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 WatchdogTime */
+#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 {
+ /* save off the usb device pointer */
+ struct usb_device *udev;
+ /* the interface for this device */
+ struct usb_interface *interface;
+
+ /* the interface number used for cmd's */
+ unsigned int interface_number;
+
+ /* the buffer to intr data */
+ unsigned char *intr_buffer;
+ /* the dma address for the intr buffer */
+ dma_addr_t intr_dma;
+ /* the size of the intr buffer */
+ size_t intr_size;
+ /* the urb used for the intr pipe */
+ struct urb *intr_urb;
+
+ /* The command that is reported back */
+ unsigned char cmd_command;
+ /* The data MSB that is reported back */
+ unsigned char cmd_data_msb;
+ /* The data LSB that is reported back */
+ unsigned char cmd_data_lsb;
+ /* true if we received a report after a command */
+ atomic_t cmd_received;
+
+ /* Wether or not the device exists */
+ int exists;
+ /* locks this structure */
+ struct mutex mtx;
+};
+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;
+ struct device *dev = &usb_pcwd->interface->dev;
+ int retval;
+
+ switch (urb->status) {
+ case 0: /* success */
+ break;
+ case -ECONNRESET: /* unlink */
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ dev_dbg(dev, "%s - urb shutting down with status: %d",
+ __func__, urb->status);
+ return;
+ /* -EPIPE: should clear the halt */
+ default: /* error */
+ dev_dbg(dev, "%s - nonzero urb status received: %d",
+ __func__, urb->status);
+ goto resubmit;
+ }
+
+ dev_dbg(dev, "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)
+ pr_err("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;
+
+ /* We will not send any commands if the USB PCWD device does
+ * not exist */
+ if ((!usb_pcwd) || (!usb_pcwd->exists))
+ return -1;
+
+ buf = kmalloc(6, GFP_KERNEL);
+ if (buf == NULL)
+ return 0;
+
+ /* 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 */
+
+ dev_dbg(&usb_pcwd->interface->dev,
+ "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, 6,
+ USB_COMMAND_TIMEOUT) != 6) {
+ dev_dbg(&usb_pcwd->interface->dev,
+ "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;
+ }
+
+ kfree(buf);
+
+ 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)) {
+ pr_err("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)) {
+ pr_err("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 long usb_pcwd_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ int __user *p = argp;
+ static const 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_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_KEEPALIVE:
+ usb_pcwd_keepalive(usb_pcwd_device);
+ return 0;
+
+ 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 {
+ pr_crit("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)
+ usb_pcwd_stop(usb_pcwd_device); /* Turn the WDT off */
+
+ return NOTIFY_DONE;
+}
+
+/*
+ * Kernel Interfaces
+ */
+
+static const struct file_operations usb_pcwd_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = usb_pcwd_write,
+ .unlocked_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_free_coherent(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) {
+ pr_err("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)) {
+ pr_err("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 (!usb_endpoint_is_int_in(endpoint)) {
+ /* we didn't find a Interrupt endpoint with direction IN */
+ pr_err("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)
+ 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 */
+ usb_pcwd->intr_buffer = usb_alloc_coherent(udev, usb_pcwd->intr_size,
+ GFP_ATOMIC, &usb_pcwd->intr_dma);
+ if (!usb_pcwd->intr_buffer) {
+ pr_err("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) {
+ pr_err("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)) {
+ pr_err("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>");
+
+ pr_info("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);
+
+ pr_info("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);
+ pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
+ WATCHDOG_HEARTBEAT);
+ }
+
+ retval = register_reboot_notifier(&usb_pcwd_notifier);
+ if (retval != 0) {
+ pr_err("cannot register reboot notifier (err=%d)\n", retval);
+ goto error;
+ }
+
+ retval = misc_register(&usb_pcwd_temperature_miscdev);
+ if (retval != 0) {
+ pr_err("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) {
+ pr_err("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);
+
+ pr_info("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);
+
+ pr_info("USB PC Watchdog disconnected\n");
+}
+
+module_usb_driver(usb_pcwd_driver);
Code Review / kvmfornfv.git / blobdiff