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Commit 9d2f79ab authored by Peter Meerwald's avatar Peter Meerwald Committed by Jonathan Cameron
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staging:iio-trig-periodic-rtc: Allow to reset frequency to 0 



periodic rtc trigger initially has frequency 0

it is possible to change trigger frequency on-the-fly, but it is not
possible to set frequency back to 0

this patch allows to set trigger frequency to 0, thereby disabling
the rtc interrupt

Signed-off-by: default avatarPeter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 1c70f7be

drivers/staging/iio/trigger/iio-trig-periodic-rtc.c

+16 −3
Original line number Diff line number Diff line
@@ -26,16 +26,22 @@ struct iio_prtc_trigger_info { 
	struct rtc_device *rtc;

	int frequency;

	struct rtc_task task;

	bool state;

};



static int iio_trig_periodic_rtc_set_state(struct iio_trigger *trig, bool state)

{

	struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);

	if (trig_info->frequency == 0)

	int ret;

	if (trig_info->frequency == 0 && state)

		return -EINVAL;

	dev_dbg(&trig_info->rtc->dev, "trigger frequency is %d\n",

			trig_info->frequency);

	return rtc_irq_set_state(trig_info->rtc, &trig_info->task, state);

	ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, state);

	if (ret == 0)

		trig_info->state = state;



	return ret;

}



static ssize_t iio_trig_periodic_read_freq(struct device *dev,
@@ -61,7 +67,14 @@ static ssize_t iio_trig_periodic_write_freq(struct device *dev, 
	if (ret)

		goto error_ret;



	if (val > 0) {

		ret = rtc_irq_set_freq(trig_info->rtc, &trig_info->task, val);

		if (ret == 0 && trig_info->state && trig_info->frequency == 0)

			ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, 1);

	} else if (val == 0) {

		ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, 0);

	} else

		ret = -EINVAL;

	if (ret)

		goto error_ret;