Commit 038696f8 authored Oct 11, 2019 by Miquel Raynal Committed by Jonathan Cameron Oct 15, 2019

iio: adc: max1027: Add debugfs register read support

Until now, only write operations were supported. Force two bytes read
operation when reading, which should fit most of the development
purposes. Of course, extended operations like buffered reads on
multiple channels or even temperature + voltage reads will not be read
entirely. Usually, just starting a new operation will work but in any
case a software reset (done through the debufs interface too) will
return the device in a usable state.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

parent 35654354

drivers/iio/adc/max1027.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -309,8 +309,11 @@ static int max1027_debugfs_reg_access(struct iio_dev *indio_dev,
		struct max1027_state *st = iio_priv(indio_dev);
		u8 val = (u8 )st->buffer;

		if (readval != NULL)
		return -EINVAL;
		if (readval) {
		int ret = spi_read(st->spi, val, 2);
		*readval = be16_to_cpu(st->buffer[0]);
		return ret;
		}

		*val = (u8)writeval;
		return spi_write(st->spi, val, 1);

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