linux/drivers/watchdog/pcwd_usb.c
Greg Kroah-Hartman bf0209747e watchdog: pcwd_usb: remove unneeded DRIVER_LICENSE #define
There is no need to #define the license of the driver, just put it in
the MODULE_LICENSE() line directly as a text string.

This allows tools that check that the module license matches the source
code license to work properly, as there is no need to unwind the
unneeded dereference, especially when it is defined just a few lines
above from where it is used.

Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: Guenter Roeck <linux@roeck-us.net>
Reported-by: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2017-12-28 20:45:50 +01:00

810 lines
21 KiB
C

/*
* 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_NAME "pcwd_usb"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
#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 const 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 through */
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;
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;
}
if (iface_desc->desc.bNumEndpoints < 1)
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);
/* 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)
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);