linux/drivers/watchdog/pcwd_usb.c

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/*
* 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,
};
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
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", __func__, urb->status);
return;
/* -EPIPE: should clear the halt */
default: /* error */
dbg("%s - nonzero urb status received: %d", __func__, 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 */
2007-07-19 08:49:03 +00:00
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);