static int led_regulator_get_voltage(struct regulator *supply,
		enum led_brightness brightness)
{
	if (brightness == 0)
		return -EINVAL;

	return regulator_list_voltage(supply, brightness - 1);
}

static inline int led_regulator_get_max_brightness(struct regulator *supply)
{
	int ret;
	int voltage = regulator_list_voltage(supply, 0);

	if (voltage <= 0)
		return 1;

	ret = regulator_set_voltage(supply, voltage, voltage);
	if (ret < 0)
		return 1;

	return regulator_count_voltages(supply);
}

static inline int led_regulator_get_max_brightness(struct regulator *supply)
{
	int ret;
	int voltage = regulator_list_voltage(supply, 0);

	if (voltage <= 0)
		return 1;

	/* even if regulator can't change voltages,
	 * we still assume it can change status
	 * and the LED can be turned on and off.
	 */
	ret = regulator_set_voltage(supply, voltage, voltage);
	if (ret < 0)
		return 1;

	return regulator_count_voltages(supply);
}

/**
 * mmc_regulator_get_ocrmask - return mask of supported voltages
 * @supply: regulator to use
 *
 * This returns either a negative errno, or a mask of voltages that
 * can be provided to MMC/SD/SDIO devices using the specified voltage
 * regulator.  This would normally be called before registering the
 * MMC host adapter.
 */
int mmc_regulator_get_ocrmask(struct regulator *supply)
{
	int			result = 0;
	int			count;
	int			i;

	count = regulator_count_voltages(supply);
	if (count < 0)
		return count;

	for (i = 0; i < count; i++) {
		int		vdd_uV;
		int		vdd_mV;

		vdd_uV = regulator_list_voltage(supply, i);
		if (vdd_uV <= 0)
			continue;

		vdd_mV = vdd_uV / 1000;
		result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
	}

	return result;
}