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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>
This commit is contained in:
Miquel Raynal 2019-10-11 16:43:40 +02:00 committed by Jonathan Cameron
parent 3565435455
commit 038696f8bd
1 changed files with 5 additions and 2 deletions
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7
drivers/iio/adc/max1027.c
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@ -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);