iio: ad_sigma_delta: select channel when reading register

BugLink: https://bugs.launchpad.net/bugs/1830922
commit fccfb9ce70ed4ea7a145f77b86de62e38178517f upstream.

The desired channel has to be selected in order to correctly fill the
buffer with the corresponding data.
The `ad_sd_write_reg()` already does this, but for the
`ad_sd_read_reg_raw()` this was omitted.

Fixes: af3008485ea03 ("iio:adc: Add common code for ADI Sigma Delta devices")
Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c
index ff5f2da2e1b134d369fbc6ce7180a9ebf0de4ec1..54d9978b274055da963ed282b6b94c0b4245fed5 100644 (file)
--- a/drivers/iio/adc/ad_sigma_delta.c
+++ b/drivers/iio/adc/ad_sigma_delta.c
@@ -121,6 +121,7 @@ static int ad_sd_read_reg_raw(struct ad_sigma_delta *sigma_delta,
        if (sigma_delta->info->has_registers) {
                data[0] = reg << sigma_delta->info->addr_shift;
                data[0] |= sigma_delta->info->read_mask;
+               data[0] |= sigma_delta->comm;
                spi_message_add_tail(&t[0], &m);
        }
        spi_message_add_tail(&t[1], &m);