static int radio_off_telit(void)
{
	int value, ret;
	struct gpio_pin *pwrmon_pin = gpio_pin_by_name("PWRMON");
	struct gpio_pin *onoff_pin = gpio_pin_by_name("3G_ONOFF");
	struct gpio_pin *rst_pin = gpio_pin_by_name("3G_RST");

	if (!onoff_pin || !pwrmon_pin || !rst_pin) {
		return -ENODEV;
	}

	value = gpio_get_value(pwrmon_pin->pin.gpio);
	if(value == 0) {
		log_error("radio is already off");
		return -EINVAL;
	}

	// drive on/off pin low for at least 3 sec
	log_info("shutting down radio");
	ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 0, onoff_pin->pin.flags & GPIOF_PULLUP);
	if (ret) {
		return ret;
	}

	msleep(3500);

	// set on/off pin high
	ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 1, onoff_pin->pin.flags & GPIOF_PULLUP);
	if (ret) {
		return ret;
	}

	// wait for radio to power off
	msleep(5000);

	// check that power is low
	value = gpio_get_value(pwrmon_pin->pin.gpio);
	if(value != 0) {
		log_warning("radio is still on. performing radio reset.");
		//Perform Hard Reset
		ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 0, rst_pin->pin.flags & GPIOF_PULLUP);
		if (ret) {
			return ret;
		}

		msleep(500);

		// set pin high
		ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 1, rst_pin->pin.flags & GPIOF_PULLUP);
		if (ret) {
			return ret;
		}
	} else {
		log_info("radio has been shut down");
	}

	return ret;
}

static int radio_on_telit(void)
{
	int value, ret;
	struct gpio_pin *pwrmon_pin = gpio_pin_by_name("PWRMON");
	struct gpio_pin *onoff_pin = gpio_pin_by_name("3G_ONOFF");
	struct gpio_pin *rst_pin = gpio_pin_by_name("3G_RST");

	if (!onoff_pin || !pwrmon_pin || !rst_pin) {
		return -ENODEV;
	}

	value = gpio_get_value(pwrmon_pin->pin.gpio);
	if(value != 0) {
		log_error("radio is already on");
		return -EINVAL;
	}

	// drive on/off pin low for at least 5 sec
	log_info("turning on radio");
	ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 0, onoff_pin->pin.flags & GPIOF_PULLUP);
	if (ret) {
		return ret;
	}

	msleep(5500);

	// set on/off pin high
	ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 1, onoff_pin->pin.flags & GPIOF_PULLUP);
	if (ret) {
		return ret;
	}

	msleep(200);

	// check that power is high
	value = gpio_get_value(pwrmon_pin->pin.gpio);
	if(value == 0) {
		log_warning("radio is still off. performing radio reset");
		//Perform Hard Reset
		ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 0, rst_pin->pin.flags & GPIOF_PULLUP);
		if (ret) {
			return ret;
		}

		msleep(500);

		// set pin high
		ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 1, rst_pin->pin.flags & GPIOF_PULLUP);
		if (ret) {
			return ret;
		}
	} else {
		log_info("radio has been turned on");
	}

	return ret;
}

static ssize_t mts_attr_store_radio_power_telit(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	int value;
	int err;

	if (sscanf(buf, "%i", &value) != 1) {
		return -EINVAL;
	}
	if (value == 0) {
		mutex_lock(&mts_io_mutex);
		err = radio_off_telit();
		mutex_unlock(&mts_io_mutex);
	} else {
		mutex_lock(&mts_io_mutex);
		err = radio_on_telit();
		mutex_unlock(&mts_io_mutex);
	}

	if (err) {
		return err;
	}

	return count;
}

static int radio_reset_telit(void)
{
	int ret;
	struct gpio_pin *rst_pin = gpio_pin_by_name("3G_RST");
	struct gpio_pin *onoff_pin = gpio_pin_by_name("3G_ONOFF");

	if (!rst_pin || !onoff_pin) {
		return -ENODEV;
	}

	// drive reset pin low for 500ms
	ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 0, rst_pin->pin.flags & GPIOF_PULLUP);
	if (ret) {
		return ret;
	}

	msleep(500);

	// set pin high
	ret = gpio_direction_output_pullup(rst_pin->pin.gpio, 1, rst_pin->pin.flags & GPIOF_PULLUP);
	if (ret) {
		return ret;
	}

	// wait for 2 sec before toggling on/off pin
	msleep(2000);

	// drive on/off pin low for 6 sec
	ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 0, onoff_pin->pin.flags & GPIOF_PULLUP);
	if (ret) {
		return ret;
	}

	msleep(6000);

	// set on/off pin high
	ret = gpio_direction_output_pullup(onoff_pin->pin.gpio, 1, onoff_pin->pin.flags & GPIOF_PULLUP);
	if (ret) {
		return ret;
	}

	return ret;
}

static ssize_t mts_attr_store_radio_reset_telit(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	int value;
	int err;

	if (sscanf(buf, "%i", &value) != 1) {
		return -EINVAL;
	}
	if (value != 0) {
		return -EINVAL;
	}

	mutex_lock(&mts_io_mutex);

	err = radio_reset_telit();

	mutex_unlock(&mts_io_mutex);

	if (err) {
		return err;
	}

	return count;
}

static DEVICE_ATTR_MTS(dev_attr_radio_power_telit, "radio-power",
	mts_attr_show_gpio_pin, mts_attr_store_radio_power_telit);

static DEVICE_ATTR_MTS(dev_attr_radio_reset_telit, "radio-reset",
	mts_attr_show_gpio_pin, mts_attr_store_radio_reset_telit);