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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: Peter Meerwald <pmeerw@pmeerw.net> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
parent
1c70f7bebc
commit
9d2f79abdf
1 changed files with 16 additions and 3 deletions
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@ -26,16 +26,22 @@ struct iio_prtc_trigger_info {
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struct rtc_device *rtc;
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struct rtc_device *rtc;
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int frequency;
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int frequency;
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struct rtc_task task;
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struct rtc_task task;
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bool state;
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};
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};
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static int iio_trig_periodic_rtc_set_state(struct iio_trigger *trig, bool state)
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static int iio_trig_periodic_rtc_set_state(struct iio_trigger *trig, bool state)
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{
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{
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struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);
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struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);
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if (trig_info->frequency == 0)
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int ret;
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if (trig_info->frequency == 0 && state)
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return -EINVAL;
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return -EINVAL;
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dev_dbg(&trig_info->rtc->dev, "trigger frequency is %d\n",
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dev_dbg(&trig_info->rtc->dev, "trigger frequency is %d\n",
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trig_info->frequency);
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trig_info->frequency);
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return rtc_irq_set_state(trig_info->rtc, &trig_info->task, state);
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ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, state);
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if (ret == 0)
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trig_info->state = state;
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return ret;
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}
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}
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static ssize_t iio_trig_periodic_read_freq(struct device *dev,
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static ssize_t iio_trig_periodic_read_freq(struct device *dev,
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@ -61,7 +67,14 @@ static ssize_t iio_trig_periodic_write_freq(struct device *dev,
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if (ret)
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if (ret)
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goto error_ret;
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goto error_ret;
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ret = rtc_irq_set_freq(trig_info->rtc, &trig_info->task, val);
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if (val > 0) {
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ret = rtc_irq_set_freq(trig_info->rtc, &trig_info->task, val);
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if (ret == 0 && trig_info->state && trig_info->frequency == 0)
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ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, 1);
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} else if (val == 0) {
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ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, 0);
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} else
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ret = -EINVAL;
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if (ret)
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if (ret)
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goto error_ret;
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goto error_ret;
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