static void pcwd_isa_shutdown(struct device *dev, unsigned int id)
{
if (debug >= DEBUG)
pr_debug("pcwd_isa_shutdown id=%d\n", id);
pcwd_stop();
}
static int __devexit pcwd_isa_remove(struct device *dev, unsigned int id)
{
if (debug >= DEBUG)
printk(KERN_DEBUG PFX "pcwd_isa_remove id=%d\n",
id);
if (!pcwd_private.io_addr)
return 1;
/* Disable the board */
if (!nowayout)
pcwd_stop();
/* Deregister */
misc_deregister(&pcwd_miscdev);
if (pcwd_private.supports_temp)
misc_deregister(&temp_miscdev);
release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
pcwd_private.io_addr = 0x0000;
cards_found--;
return 0;
}
static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id)
{
int ret;
if (debug >= DEBUG)
printk(KERN_DEBUG PFX "pcwd_isa_probe id=%d\n",
id);
cards_found++;
if (cards_found == 1)
printk(KERN_INFO PFX "v%s Ken Hollis ([email protected])\n",
WATCHDOG_VERSION);
if (cards_found > 1) {
printk(KERN_ERR PFX "This driver only supports 1 device\n");
return -ENODEV;
}
if (pcwd_ioports[id] == 0x0000) {
printk(KERN_ERR PFX "No I/O-Address for card detected\n");
return -ENODEV;
}
pcwd_private.io_addr = pcwd_ioports[id];
spin_lock_init(&pcwd_private.io_lock);
/* Check card's revision */
pcwd_private.revision = get_revision();
if (!request_region(pcwd_private.io_addr,
(pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
pcwd_private.io_addr);
ret = -EIO;
goto error_request_region;
}
/* Initial variables */
pcwd_private.supports_temp = 0;
temp_panic = 0;
pcwd_private.boot_status = 0x0000;
/* get the boot_status */
pcwd_get_status(&pcwd_private.boot_status);
/* clear the "card caused reboot" flag */
pcwd_clear_status();
setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0);
/* Disable the board */
pcwd_stop();
/* Check whether or not the card supports the temperature device */
pcwd_check_temperature_support();
/* Show info about the card itself */
pcwd_show_card_info();
/* If heartbeat = 0 then we use the heartbeat from the dip-switches */
if (heartbeat == 0)
heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)];
/* Check that the heartbeat value is within it's range;
if not reset to the default */
if (pcwd_set_heartbeat(heartbeat)) {
pcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
printk(KERN_INFO PFX
"heartbeat value must be 2 <= heartbeat <= 7200, using %d\n",
WATCHDOG_HEARTBEAT);
}
if (pcwd_private.supports_temp) {
ret = misc_register(&temp_miscdev);
if (ret) {
printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
TEMP_MINOR, ret);
goto error_misc_register_temp;
}
}
ret = misc_register(&pcwd_miscdev);
if (ret) {
printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto error_misc_register_watchdog;
}
printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
heartbeat, nowayout);
return 0;
error_misc_register_watchdog:
if (pcwd_private.supports_temp)
misc_deregister(&temp_miscdev);
error_misc_register_temp:
release_region(pcwd_private.io_addr,
(pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
error_request_region:
pcwd_private.io_addr = 0x0000;
cards_found--;
return ret;
}
static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int rv;
int status;
int temperature;
int new_heartbeat;
int __user *argp = (int __user *)arg;
static const struct watchdog_info ident = {
.options = WDIOF_OVERHEAT |
WDIOF_CARDRESET |
WDIOF_KEEPALIVEPING |
WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "PCWD",
};
switch (cmd) {
case WDIOC_GETSUPPORT:
if (copy_to_user(argp, &ident, sizeof(ident)))
return -EFAULT;
return 0;
case WDIOC_GETSTATUS:
pcwd_get_status(&status);
return put_user(status, argp);
case WDIOC_GETBOOTSTATUS:
return put_user(pcwd_private.boot_status, argp);
case WDIOC_GETTEMP:
if (pcwd_get_temperature(&temperature))
return -EFAULT;
return put_user(temperature, argp);
case WDIOC_SETOPTIONS:
if (pcwd_private.revision == PCWD_REVISION_C) {
if (get_user(rv, argp))
return -EFAULT;
if (rv & WDIOS_DISABLECARD) {
status = pcwd_stop();
if (status < 0)
return status;
}
if (rv & WDIOS_ENABLECARD) {
status = pcwd_start();
if (status < 0)
return status;
}
if (rv & WDIOS_TEMPPANIC)
temp_panic = 1;
}
return -EINVAL;
case WDIOC_KEEPALIVE:
pcwd_keepalive();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_heartbeat, argp))
return -EFAULT;
if (pcwd_set_heartbeat(new_heartbeat))
return -EINVAL;
pcwd_keepalive();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(heartbeat, argp);
default:
return -ENOTTY;
}
return 0;
}
static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len,
loff_t *ppos)
{
if (len) {
if (!nowayout) {
size_t i;
/* In case it was set long ago */
expect_close = 0;
for (i = 0; i != len; i++) {
char c;
if (get_user(c, buf + i))
return -EFAULT;
if (c == 'V')
expect_close = 42;
}
}
pcwd_keepalive();
}
return len;
}
static int pcwd_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &open_allowed))
return -EBUSY;
if (nowayout)
__module_get(THIS_MODULE);
/* Activate */
pcwd_start();
pcwd_keepalive();
return nonseekable_open(inode, file);
}
static int pcwd_close(struct inode *inode, struct file *file)
{
if (expect_close == 42)
pcwd_stop();
else {
printk(KERN_CRIT PFX
"Unexpected close, not stopping watchdog!\n");
pcwd_keepalive();
}
expect_close = 0;
clear_bit(0, &open_allowed);
return 0;
}
/*
* /dev/temperature handling
*/
static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
int temperature;
if (pcwd_get_temperature(&temperature))
return -EFAULT;
if (copy_to_user(buf, &temperature, 1))
return -EFAULT;
return 1;
}
static int pcwd_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int rv;
int status;
int temperature;
int new_heartbeat;
static struct watchdog_info ident = {
.options = WDIOF_OVERHEAT |
WDIOF_CARDRESET |
WDIOF_KEEPALIVEPING |
WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "PCWD",
};
switch(cmd) {
default:
return -ENOIOCTLCMD;
case WDIOC_GETSUPPORT:
if(copy_to_user((void*)arg, &ident, sizeof(ident)))
return -EFAULT;
return 0;
case WDIOC_GETSTATUS:
pcwd_get_status(&status);
return put_user(status, (int *) arg);
case WDIOC_GETBOOTSTATUS:
return put_user(initial_status, (int *) arg);
case WDIOC_GETTEMP:
if (pcwd_get_temperature(&temperature))
return -EFAULT;
return put_user(temperature, (int *) arg);
case WDIOC_SETOPTIONS:
if (revision == PCWD_REVISION_C)
{
if(copy_from_user(&rv, (int*) arg, sizeof(int)))
return -EFAULT;
if (rv & WDIOS_DISABLECARD)
{
return pcwd_stop();
}
if (rv & WDIOS_ENABLECARD)
{
return pcwd_start();
}
if (rv & WDIOS_TEMPPANIC)
{
temp_panic = 1;
}
}
return -EINVAL;
case WDIOC_KEEPALIVE:
pcwd_keepalive();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_heartbeat, (int *) arg))
return -EFAULT;
if (pcwd_set_heartbeat(new_heartbeat))
return -EINVAL;
pcwd_keepalive();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(heartbeat, (int *)arg);
}
return 0;
}
static ssize_t pcwd_write(struct file *file, const char *buf, size_t len,
loff_t *ppos)
{
/* Can't seek (pwrite) on this device */
if (ppos != &file->f_pos)
return -ESPIPE;
if (len) {
if (!nowayout) {
size_t i;
/* In case it was set long ago */
expect_close = 0;
for (i = 0; i != len; i++) {
char c;
if (get_user(c, buf + i))
return -EFAULT;
if (c == 'V')
expect_close = 42;
}
}
pcwd_keepalive();
}
return len;
}
static int pcwd_open(struct inode *inode, struct file *file)
{
if (!atomic_dec_and_test(&open_allowed) ) {
atomic_inc( &open_allowed );
return -EBUSY;
}
if (nowayout)
__module_get(THIS_MODULE);
/* Activate */
pcwd_start();
pcwd_keepalive();
return(0);
}
static int pcwd_close(struct inode *inode, struct file *file)
{
if (expect_close == 42) {
pcwd_stop();
atomic_inc( &open_allowed );
} else {
printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
pcwd_keepalive();
}
expect_close = 0;
return 0;
}
/*
* /dev/temperature handling
*/
static ssize_t pcwd_temp_read(struct file *file, char *buf, size_t count,
loff_t *ppos)
{
int temperature;
/* Can't seek (pread) on this device */
if (ppos != &file->f_pos)
return -ESPIPE;
if (pcwd_get_temperature(&temperature))
return -EFAULT;
if (copy_to_user(buf, &temperature, 1))
return -EFAULT;
return 1;
}
