static int __init it87_wdt_init()

in it87_wdt.c [255:342]

• 77 lines of code
• 29 McCabe index (conditional complexity)

static int __init it87_wdt_init(void)
{
	u8  chip_rev;
	int rc;

	rc = superio_enter();
	if (rc)
		return rc;

	chip_type = superio_inw(CHIPID);
	chip_rev  = superio_inb(CHIPREV) & 0x0f;
	superio_exit();

	switch (chip_type) {
	case IT8702_ID:
		max_units = 255;
		break;
	case IT8712_ID:
		max_units = (chip_rev < 8) ? 255 : 65535;
		break;
	case IT8716_ID:
	case IT8726_ID:
		max_units = 65535;
		break;
	case IT8607_ID:
	case IT8620_ID:
	case IT8622_ID:
	case IT8625_ID:
	case IT8628_ID:
	case IT8655_ID:
	case IT8665_ID:
	case IT8686_ID:
	case IT8718_ID:
	case IT8720_ID:
	case IT8721_ID:
	case IT8728_ID:
	case IT8772_ID:
	case IT8783_ID:
	case IT8784_ID:
	case IT8786_ID:
		max_units = 65535;
		break;
	case IT8705_ID:
		pr_err("Unsupported Chip found, Chip %04x Revision %02x\n",
		       chip_type, chip_rev);
		return -ENODEV;
	case NO_DEV_ID:
		pr_err("no device\n");
		return -ENODEV;
	default:
		pr_err("Unknown Chip found, Chip %04x Revision %04x\n",
		       chip_type, chip_rev);
		return -ENODEV;
	}

	rc = superio_enter();
	if (rc)
		return rc;

	superio_select(GPIO);
	superio_outb(WDT_TOV1, WDTCFG);
	superio_outb(0x00, WDTCTRL);
	superio_exit();

	if (timeout < 1 || timeout > max_units * 60) {
		timeout = DEFAULT_TIMEOUT;
		pr_warn("Timeout value out of range, use default %d sec\n",
			DEFAULT_TIMEOUT);
	}

	if (timeout > max_units)
		timeout = wdt_round_time(timeout);

	wdt_dev.timeout = timeout;
	wdt_dev.max_timeout = max_units * 60;

	watchdog_stop_on_reboot(&wdt_dev);
	rc = watchdog_register_device(&wdt_dev);
	if (rc) {
		pr_err("Cannot register watchdog device (err=%d)\n", rc);
		return rc;
	}

	pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d)\n",
		chip_type, chip_rev, timeout, nowayout, testmode);

	return 0;
}