iio: adc: ad7091r: Add chip_info callback to get conversion result channel

AD7091R-5 and AD7091R-2/-4/-8 have slightly different register field
layout and due to that require different masks for getting the index of
the channel associated with each read.
Add a callback function so the base driver can get correct channel ID
for each chip variant.

Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
Link: https://lore.kernel.org/r/1f7a40b4839b3a1c3f1a0654a1b329bea870feb6.1703013352.git.marcelo.schmitt1@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/iio/adc/ad7091r5.c b/drivers/iio/adc/ad7091r5.c
index e1163b42609c..a75837334157 100644
--- a/drivers/iio/adc/ad7091r5.c
+++ b/drivers/iio/adc/ad7091r5.c
@@ -54,11 +54,17 @@ static int ad7091r5_set_mode(struct ad7091r_state *st, enum ad7091r_mode mode)
 	return 0;
 }
 
+static unsigned int ad7091r5_reg_result_chan_id(unsigned int val)
+{
+	return AD7091R5_REG_RESULT_CH_ID(val);
+}
+
 static const struct ad7091r_chip_info ad7091r5_chip_info_irq = {
 	.name = "ad7091r-5",
 	.channels = ad7091r5_channels_irq,
 	.num_channels = ARRAY_SIZE(ad7091r5_channels_irq),
 	.vref_mV = 2500,
+	.reg_result_chan_id = &ad7091r5_reg_result_chan_id,
 	.set_mode = &ad7091r5_set_mode,
 };
 
@@ -67,6 +73,7 @@ static const struct ad7091r_chip_info ad7091r5_chip_info_noirq = {
 	.channels = ad7091r5_channels_noirq,
 	.num_channels = ARRAY_SIZE(ad7091r5_channels_noirq),
 	.vref_mV = 2500,
+	.reg_result_chan_id = &ad7091r5_reg_result_chan_id,
 	.set_mode = &ad7091r5_set_mode,
 };