int extcon_get_property()

in extcon.c [603:667]
45 lines of code
10 McCabe index (conditional complexity)

int extcon_get_property(struct extcon_dev *edev, unsigned int id,
				unsigned int prop,
				union extcon_property_value *prop_val)
{
	struct extcon_cable *cable;
	unsigned long flags;
	int index, ret = 0;

	*prop_val = (union extcon_property_value){0};

	if (!edev)
		return -EINVAL;

	/* Check whether the property is supported or not */
	if (!is_extcon_property_supported(id, prop))
		return -EINVAL;

	/* Find the cable index of external connector by using id */
	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;

	spin_lock_irqsave(&edev->lock, flags);

	/* Check whether the property is available or not. */
	if (!is_extcon_property_capability(edev, id, index, prop)) {
		spin_unlock_irqrestore(&edev->lock, flags);
		return -EPERM;
	}

	/*
	 * Check whether the external connector is attached.
	 * If external connector is detached, the user can not
	 * get the property value.
	 */
	if (!is_extcon_attached(edev, index)) {
		spin_unlock_irqrestore(&edev->lock, flags);
		return 0;
	}

	cable = &edev->cables[index];

	/* Get the property value according to extcon type */
	switch (prop) {
	case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
		*prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
		break;
	case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
		*prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
		break;
	case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
		*prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
		break;
	case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
		*prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
		break;
	default:
		ret = -EINVAL;
		break;
	}

	spin_unlock_irqrestore(&edev->lock, flags);

	return ret;
}