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staging:iio-trig-periodic-rtc: Allow to reset frequency to 0

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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: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Peter Meerwald 2014-12-06 06:00:00 +00:00 committed by Jonathan Cameron
parent 1c70f7bebc
commit 9d2f79abdf
1 changed files with 16 additions and 3 deletions
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19
drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
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@ -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;
ret = rtc_irq_set_freq(trig_info->rtc, &trig_info->task, val);
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;