static int wm831x_status_blink_set()

in leds-wm831x-status.c [82:149]

• 57 lines of code
• 14 McCabe index (conditional complexity)

static int wm831x_status_blink_set(struct led_classdev *led_cdev,
				   unsigned long *delay_on,
				   unsigned long *delay_off)
{
	struct wm831x_status *led = to_wm831x_status(led_cdev);
	unsigned long flags;
	int ret = 0;

	/* Pick some defaults if we've not been given times */
	if (*delay_on == 0 && *delay_off == 0) {
		*delay_on = 250;
		*delay_off = 250;
	}

	spin_lock_irqsave(&led->value_lock, flags);

	/* We only have a limited selection of settings, see if we can
	 * support the configuration we're being given */
	switch (*delay_on) {
	case 1000:
		led->blink_time = 0;
		break;
	case 250:
		led->blink_time = 1;
		break;
	case 125:
		led->blink_time = 2;
		break;
	case 62:
	case 63:
		/* Actually 62.5ms */
		led->blink_time = 3;
		break;
	default:
		ret = -EINVAL;
		break;
	}

	if (ret == 0) {
		switch (*delay_off / *delay_on) {
		case 1:
			led->blink_cyc = 0;
			break;
		case 3:
			led->blink_cyc = 1;
			break;
		case 4:
			led->blink_cyc = 2;
			break;
		case 8:
			led->blink_cyc = 3;
			break;
		default:
			ret = -EINVAL;
			break;
		}
	}

	if (ret == 0)
		led->blink = 1;
	else
		led->blink = 0;

	spin_unlock_irqrestore(&led->value_lock, flags);
	wm831x_status_set(led);

	return ret;
}