iio: adc: max1027: Prevent single channel accesses during buffer reads

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When hardware buffers are enabled (the cnvst pin being the trigger), one
should not mess with the device state by requesting a single channel
read.

There is already a iio_buffer_enabled() check in *_read_single_value()
to merely prevent this situation but the check is inconsistent since
buffers can be enabled after the if clause anyway. Instead, use the core
mutex by calling iio_device_claim/release_direct_mode().

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20210921115408.66711-11-miquel.raynal@bootlin.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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Miquel Raynal 2021-09-21 13:54:02 +02:00 • committed by Jonathan Cameron

parent af8b93e27f

commit 59fcc6af89

1 changed files with 7 additions and 4 deletions

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drivers/iio/adc/max1027.c

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