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iio: adc: ad7606: protect register access

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Protect register (and bus) access from concurrent
read / write. Needed in the backend operating mode.

Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Link: https://patch.msgid.link/20250210-wip-bl-ad7606_add_backend_sw_mode-v4-7-160df18b1da7@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Angelo Dureghello 2025-02-10 17:10:57 +01:00 committed by Jonathan Cameron
parent 79c47485e4
commit 0f65f59e63
1 changed files with 10 additions and 0 deletions
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10
drivers/iio/adc/ad7606.c
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@ -862,7 +862,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
}
val = (val * MICRO) + val2;
i = find_closest(val, scale_avail_uv, cs->num_scales);
ret = iio_device_claim_direct_mode(indio_dev);
if (ret < 0)
return ret;
ret = st->write_scale(indio_dev, ch, i + cs->reg_offset);
iio_device_release_direct_mode(indio_dev);
if (ret < 0)
return ret;
cs->range = i;
@ -873,7 +878,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
return -EINVAL;
i = find_closest(val, st->oversampling_avail,
st->num_os_ratios);
ret = iio_device_claim_direct_mode(indio_dev);
if (ret < 0)
return ret;
ret = st->write_os(indio_dev, i);
iio_device_release_direct_mode(indio_dev);
if (ret < 0)
return ret;
st->oversampling = st->oversampling_avail[i];