static int led_pwm_add()

in leds-pwm.c [61:133]

• 62 lines of code
• 9 McCabe index (conditional complexity)

static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
		       struct led_pwm *led, struct fwnode_handle *fwnode)
{
	struct led_pwm_data *led_data = &priv->leds[priv->num_leds];
	struct led_init_data init_data = { .fwnode = fwnode };
	int ret;

	led_data->active_low = led->active_low;
	led_data->cdev.name = led->name;
	led_data->cdev.brightness = LED_OFF;
	led_data->cdev.max_brightness = led->max_brightness;
	led_data->cdev.flags = LED_CORE_SUSPENDRESUME;

	led_data->pwm = devm_fwnode_pwm_get(dev, fwnode, NULL);
	if (IS_ERR(led_data->pwm))
		return dev_err_probe(dev, PTR_ERR(led_data->pwm),
				     "unable to request PWM for %s\n",
				     led->name);

	led_data->cdev.brightness_set_blocking = led_pwm_set;

	/* init PWM state */
	switch (led->default_state) {
	case LEDS_DEFSTATE_KEEP:
		pwm_get_state(led_data->pwm, &led_data->pwmstate);
		if (led_data->pwmstate.period)
			break;
		led->default_state = LEDS_DEFSTATE_OFF;
		dev_warn(dev,
			"failed to read period for %s, default to off",
			led->name);
		fallthrough;
	default:
		pwm_init_state(led_data->pwm, &led_data->pwmstate);
		break;
	}

	/* set brightness */
	switch (led->default_state) {
	case LEDS_DEFSTATE_ON:
		led_data->cdev.brightness = led->max_brightness;
		break;
	case LEDS_DEFSTATE_KEEP:
		{
		uint64_t brightness;

		brightness = led->max_brightness;
		brightness *= led_data->pwmstate.duty_cycle;
		do_div(brightness, led_data->pwmstate.period);
		led_data->cdev.brightness = brightness;
		}
		break;
	}

	ret = devm_led_classdev_register_ext(dev, &led_data->cdev, &init_data);
	if (ret) {
		dev_err(dev, "failed to register PWM led for %s: %d\n",
			led->name, ret);
		return ret;
	}

	if (led->default_state != LEDS_DEFSTATE_KEEP) {
		ret = led_pwm_set(&led_data->cdev, led_data->cdev.brightness);
		if (ret) {
			dev_err(dev, "failed to set led PWM value for %s: %d",
				led->name, ret);
			return ret;
		}
	}

	priv->num_leds++;
	return 0;
}