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staging:iio:accel:sca3000 Fix clearing of flag + setting of size of scan.

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Not clearing the stuff_to_read flag can lead to a false flag being set
on restarting the buffer if the data was not all read the previous time.

The size of the scan is needed to ensure the function
iio_buffer_read_first_n_outer actually tries to read the data.

This stuff has been broken for some time so not stable material.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
This commit is contained in:
Jonathan Cameron 2016-10-08 17:39:04 +01:00
parent d1bf1a865f
commit 271a25f648
1 changed files with 13 additions and 0 deletions
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13
drivers/staging/iio/accel/sca3000.c
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@ -1491,6 +1491,19 @@ int __sca3000_hw_ring_state_set(struct iio_dev *indio_dev, bool state)
**/
static int sca3000_hw_ring_preenable(struct iio_dev *indio_dev)
{
/*
* Set stuff to read to indicate no data present.
* Need for cases where the interrupt had fired at the
* end of a cycle, but the data was never read.
*/
indio_dev->buffer->stufftoread = 0;
/*
* Needed to ensure the core will actually read data
* from the device rather than assuming no channels
* are enabled.
*/
indio_dev->buffer->bytes_per_datum = 6;
return __sca3000_hw_ring_state_set(indio_dev, 1);
}