Exemplo n.º 1
0
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;
}
Exemplo n.º 2
0
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;
}