[PATCH v3 08/10] iio: adc: ad7606: Introduce num_adc_channels

Guillaume Stols
2024-10-04T21:48:58Z

This variable determines how many hardware channels has the chip,
oppositely to the num_channels that can contain more channels, e.g a
timestamp channel in our case. Introducing this variable avoids
decreasing the former num_channels variable when reading the ADC's
channels, and clarifies a bit the code.

Signed-off-by: Guillaume Stols <gstols@baylibre.com>
---
drivers/iio/adc/ad7606.c | 10 +++++++++-
drivers/iio/adc/ad7606.h | 2 ++
2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
index 612e6d9f57ed..3666a58f8a6f 100644
--- a/drivers/iio/adc/ad7606.c
+++ b/drivers/iio/adc/ad7606.c
@@ -150,6 +150,7 @@ static int ad7606_16bit_chan_scale_setup(struct ad7606_state *st,
const struct ad7606_chip_info ad7605_4_info = {
.channels = ad7605_channels,
.name = "ad7605-4",
+ .num_adc_channels = 4,
.num_channels = 5,
.scale_setup_cb = ad7606_16bit_chan_scale_setup,
};
@@ -158,6 +159,7 @@ EXPORT_SYMBOL_NS_GPL(ad7605_4_info, IIO_AD7606);
const struct ad7606_chip_info ad7606_8_info = {
.channels = ad7606_channels_16bit,
.name = "ad7606-8",
+ .num_adc_channels = 8,
.num_channels = 9,
.oversampling_avail = ad7606_oversampling_avail,
.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
@@ -168,6 +170,7 @@ EXPORT_SYMBOL_NS_GPL(ad7606_8_info, IIO_AD7606);
const struct ad7606_chip_info ad7606_6_info = {
.channels = ad7606_channels_16bit,
.name = "ad7606-6",
+ .num_adc_channels = 6,
.num_channels = 7,
.oversampling_avail = ad7606_oversampling_avail,
.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
@@ -178,6 +181,7 @@ EXPORT_SYMBOL_NS_GPL(ad7606_6_info, IIO_AD7606);
const struct ad7606_chip_info ad7606_4_info = {
.channels = ad7606_channels_16bit,
.name = "ad7606-4",
+ .num_adc_channels = 4,
.num_channels = 5,
.oversampling_avail = ad7606_oversampling_avail,
.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
@@ -188,6 +192,7 @@ EXPORT_SYMBOL_NS_GPL(ad7606_4_info, IIO_AD7606);
const struct ad7606_chip_info ad7606b_info = {
.channels = ad7606_channels_16bit,
.name = "ad7606b",
+ .num_adc_channels = 8,
.num_channels = 9,
.oversampling_avail = ad7606_oversampling_avail,
.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
@@ -198,6 +203,7 @@ EXPORT_SYMBOL_NS_GPL(ad7606b_info, IIO_AD7606);
const struct ad7606_chip_info ad7606c_16_info = {
.channels = ad7606_channels_16bit,
.name = "ad7606c16",
+ .num_adc_channels = 8,
.num_channels = 9,
.oversampling_avail = ad7606_oversampling_avail,
.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
@@ -208,6 +214,7 @@ EXPORT_SYMBOL_NS_GPL(ad7606c_16_info, IIO_AD7606);
const struct ad7606_chip_info ad7606c_18_info = {
.channels = ad7606_channels_18bit,
.name = "ad7606c18",
+ .num_adc_channels = 8,
.num_channels = 9,
.oversampling_avail = ad7606_oversampling_avail,
.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
@@ -219,6 +226,7 @@ const struct ad7606_chip_info ad7616_info = {
.channels = ad7616_channels,
.init_delay_ms = 15,
.name = "ad7616",
+ .num_adc_channels = 16,
.num_channels = 17,
.oversampling_avail = ad7616_oversampling_avail,
.oversampling_num = ARRAY_SIZE(ad7616_oversampling_avail),
@@ -528,7 +536,7 @@ static int ad7606_set_sampling_freq(struct ad7606_state *st, unsigned long freq)

static int ad7606_read_samples(struct ad7606_state *st)
{
- unsigned int num = st->chip_info->num_channels - 1;
+ unsigned int num = st->chip_info->num_adc_channels;

return st->bops->read_block(st->dev, num, &st->data);
}
diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h
index d401d3ab37e0..b26a11b2eba1 100644
--- a/drivers/iio/adc/ad7606.h
+++ b/drivers/iio/adc/ad7606.h
@@ -71,6 +71,7 @@ typedef int (*ad7606_scale_setup_cb_t)(struct ad7606_state *st,
* @channels: channel specification
* @name device name
* @num_channels: number of channels
+ * @num_adc_channels the number of channels the ADC actually inputs.
* @scale_setup_cb: callback to setup the scales for each channel
* @oversampling_avail pointer to the array which stores the available
* oversampling ratios.
@@ -82,6 +83,7 @@ typedef int (*ad7606_scale_setup_cb_t)(struct ad7606_state *st,
struct ad7606_chip_info {
const struct iio_chan_spec *channels;
const char *name;
+ unsigned int num_adc_channels;
unsigned int num_channels;
ad7606_scale_setup_cb_t scale_setup_cb;
const unsigned int *oversampling_avail;

--
2.34.1