static ssize_t wdtpci_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
/* Can't seek (pwrite) on this device */
if (ppos != &file->f_pos)
return -ESPIPE;
if (count) {
if (!nowayout) {
size_t i;
expect_close = 0;
for (i = 0; i != count; i++) {
char c;
if(get_user(c, buf+i))
return -EFAULT;
if (c == 'V')
expect_close = 1;
}
}
wdtpci_ping();
}
return count;
}
static int wdtpci_release(struct inode *inode, struct file *file)
{
if (iminor(inode)==WATCHDOG_MINOR) {
unsigned long flags;
if (expect_close) {
spin_lock_irqsave(&wdtpci_lock, flags);
inb_p(WDT_DC); /* Disable counters */
wdtpci_ctr_load(2,0); /* 0 length reset pulses now */
spin_unlock_irqrestore(&wdtpci_lock, flags);
} else {
printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
wdtpci_ping();
}
up(&open_sem);
}
return 0;
}
static ssize_t wdtpci_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
if (count) {
if (!nowayout) {
size_t i;
expect_close = 0;
for (i = 0; i != count; i++) {
char c;
if (get_user(c, buf + i))
return -EFAULT;
if (c == 'V')
expect_close = 42;
}
}
wdtpci_ping();
}
return count;
}
static long wdtpci_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_heartbeat;
int status;
struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT|
WDIOF_MAGICCLOSE|
WDIOF_KEEPALIVEPING,
.firmware_version = 1,
.identity = "PCI-WDT500/501",
};
/* Add options according to the card we have */
ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
if (type == 501) {
ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
WDIOF_POWEROVER);
if (tachometer)
ident.options |= WDIOF_FANFAULT;
}
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
wdtpci_get_status(&status);
return put_user(status, p);
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_KEEPALIVE:
wdtpci_ping();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_heartbeat, p))
return -EFAULT;
if (wdtpci_set_heartbeat(new_heartbeat))
return -EINVAL;
wdtpci_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(heartbeat, p);
default:
return -ENOTTY;
}
}
static int wdtpci_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &open_lock))
return -EBUSY;
if (nowayout)
__module_get(THIS_MODULE);
/*
* Activate
*/
wdtpci_start();
return nonseekable_open(inode, file);
}
static int wdtpci_release(struct inode *inode, struct file *file)
{
if (expect_close == 42) {
wdtpci_stop();
} else {
printk(KERN_CRIT PFX "Unexpected close, not stopping timer!");
wdtpci_ping();
}
expect_close = 0;
clear_bit(0, &open_lock);
return 0;
}
static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
size_t count, loff_t *ptr)
{
int temperature;
if (wdtpci_get_temperature(&temperature))
return -EFAULT;
if (copy_to_user(buf, &temperature, 1))
return -EFAULT;
return 1;
}
static long wdtpci_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_heartbeat;
int status;
struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT|
WDIOF_MAGICCLOSE|
WDIOF_KEEPALIVEPING,
.firmware_version = 1,
.identity = "PCI-WDT500/501",
};
/* Add options according to the card we have */
ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
if (type == 501) {
ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
WDIOF_POWEROVER);
if (tachometer)
ident.options |= WDIOF_FANFAULT;
}
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
wdtpci_get_status(&status);
return put_user(status, p);
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_KEEPALIVE:
wdtpci_ping();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_heartbeat, p))
return -EFAULT;
if (wdtpci_set_heartbeat(new_heartbeat))
return -EINVAL;
wdtpci_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(heartbeat, p);
default:
return -ENOTTY;
}
}
/**
* wdtpci_open:
* @inode: inode of device
* @file: file handle to device
*
* The watchdog device has been opened. The watchdog device is single
* open and on opening we load the counters. Counter zero is a 100Hz
* cascade, into counter 1 which downcounts to reboot. When the counter
* triggers counter 2 downcounts the length of the reset pulse which
* set set to be as long as possible.
*/
static int wdtpci_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &open_lock))
return -EBUSY;
if (nowayout)
__module_get(THIS_MODULE);
/*
* Activate
*/
wdtpci_start();
return nonseekable_open(inode, file);
}
/**
* wdtpci_release:
* @inode: inode to board
* @file: file handle to board
*
* The watchdog has a configurable API. There is a religious dispute
* between people who want their watchdog to be able to shut down and
* those who want to be sure if the watchdog manager dies the machine
* reboots. In the former case we disable the counters, in the latter
* case you have to open it again very soon.
*/
static int wdtpci_release(struct inode *inode, struct file *file)
{
if (expect_close == 42) {
wdtpci_stop();
} else {
pr_crit("Unexpected close, not stopping timer!\n");
wdtpci_ping();
}
expect_close = 0;
clear_bit(0, &open_lock);
return 0;
}
/**
* wdtpci_temp_read:
* @file: file handle to the watchdog board
* @buf: buffer to write 1 byte into
* @count: length of buffer
* @ptr: offset (no seek allowed)
*
* Read reports the temperature in degrees Fahrenheit. The API is in
* fahrenheit. It was designed by an imperial measurement luddite.
*/
static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
size_t count, loff_t *ptr)
{
int temperature;
if (wdtpci_get_temperature(&temperature))
return -EFAULT;
if (copy_to_user(buf, &temperature, 1))
return -EFAULT;
return 1;
}
static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
int new_margin;
static struct watchdog_info ident = {
.options = WDIOF_OVERHEAT | WDIOF_POWERUNDER |
WDIOF_POWEROVER | WDIOF_EXTERN1 |
WDIOF_EXTERN2 | WDIOF_FANFAULT |
WDIOF_SETTIMEOUT|WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "WDT500/501PCI",
};
ident.options&=WDT_OPTION_MASK; /* Mask down to the card we have */
switch(cmd)
{
default:
return -ENOTTY;
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
case WDIOC_GETSTATUS:
return put_user(wdtpci_status(),(int *)arg);
case WDIOC_GETBOOTSTATUS:
return put_user(0, (int *)arg);
case WDIOC_KEEPALIVE:
wdtpci_ping();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int *)arg))
return -EFAULT;
/* Arbitrary, can't find the card's limits */
new_margin *= 100;
if ((new_margin < 0) || (new_margin > WD_TIMO_MAX))
return -EINVAL;
wd_margin = new_margin;
wdtpci_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(wd_margin / 100, (int *)arg);
}
}
/**
* wdtpci_open:
* @inode: inode of device
* @file: file handle to device
*
* One of our two misc devices has been opened. The watchdog device is
* single open and on opening we load the counters. Counter zero is a
* 100Hz cascade, into counter 1 which downcounts to reboot. When the
* counter triggers counter 2 downcounts the length of the reset pulse
* which set set to be as long as possible.
*/
static int wdtpci_open(struct inode *inode, struct file *file)
{
unsigned long flags;
switch(iminor(inode))
{
case WATCHDOG_MINOR:
if (down_trylock(&open_sem))
return -EBUSY;
if (nowayout) {
__module_get(THIS_MODULE);
}
/*
* Activate
*/
spin_lock_irqsave(&wdtpci_lock, flags);
inb_p(WDT_DC); /* Disable */
/*
* "pet" the watchdog, as Access says.
* This resets the clock outputs.
*/
wdtpci_ctr_mode(2,0);
outb_p(0, WDT_DC);
inb_p(WDT_DC);
outb_p(0, WDT_CLOCK); /* 2.0833MHz clock */
inb_p(WDT_BUZZER); /* disable */
inb_p(WDT_OPTONOTRST); /* disable */
inb_p(WDT_OPTORST); /* disable */
inb_p(WDT_PROGOUT); /* disable */
wdtpci_ctr_mode(0,3);
wdtpci_ctr_mode(1,2);
wdtpci_ctr_mode(2,1);
wdtpci_ctr_load(0,20833); /* count at 100Hz */
wdtpci_ctr_load(1,wd_margin);/* Timeout 60 seconds */
/* DO NOT LOAD CTR2 on PCI card! -- JPN */
outb_p(0, WDT_DC); /* Enable */
spin_unlock_irqrestore(&wdtpci_lock, flags);
return 0;
case TEMP_MINOR:
return 0;
default:
return -ENODEV;
}
}
