static long pcwd_ioctl()

in pcwd.c [586:664]

• 65 lines of code
• 20 McCabe index (conditional complexity)

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();
		fallthrough;

	case WDIOC_GETTIMEOUT:
		return put_user(heartbeat, argp);

	default:
		return -ENOTTY;
	}

	return 0;
}