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iio: adc: max1027: Create a helper to configure the channels to scan 

These bits are meant to be reused for triggered buffers setup.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20210921115408.66711-10-miquel.raynal@bootlin.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Miquel Raynal 2021-09-21 13:54:01 +02:00 committed by Jonathan Cameron
parent cba18232c4
commit af8b93e27f
1 changed files with 15 additions and 12 deletions
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27
drivers/iio/adc/max1027.c
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@ -272,6 +272,19 @@ struct max1027_state {
u8 reg ____cacheline_aligned;
};
/* Scan from chan 0 to the highest requested channel. Include temperature on demand. */
static int max1027_configure_chans_and_start(struct iio_dev *indio_dev)
{
struct max1027_state *st = iio_priv(indio_dev);
st->reg = MAX1027_CONV_REG | MAX1027_SCAN_0_N;
st->reg |= MAX1027_CHAN(fls(*indio_dev->active_scan_mask) - 2);
if (*indio_dev->active_scan_mask & MAX1X27_SCAN_MASK_TEMP)
st->reg |= MAX1027_TEMP;
return spi_write(st->spi, &st->reg, 1);
}
static int max1027_enable_trigger(struct iio_dev *indio_dev, bool enable)
{
struct max1027_state *st = iio_priv(indio_dev);
@ -403,7 +416,6 @@ static int max1027_validate_trigger(struct iio_dev *indio_dev,
static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct max1027_state *st = iio_priv(indio_dev);
int ret;
/*
@ -417,17 +429,8 @@ static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state)
return ret;
if (state) {
/*
* Scan from chan 0 to the highest requested channel.
* Include temperature on demand.
*/
st->reg = MAX1027_CONV_REG | MAX1027_SCAN_0_N;
st->reg |= MAX1027_CHAN(fls(*indio_dev->active_scan_mask) - 2);
if (*indio_dev->active_scan_mask & MAX1X27_SCAN_MASK_TEMP)
st->reg |= MAX1027_TEMP;
ret = spi_write(st->spi, &st->reg, 1);
if (ret < 0)
ret = max1027_configure_chans_and_start(indio_dev);
if (ret)
return ret;
}