[PATCH v7 7/7] iio: adc: ad7380: add support for ad738x-4 4 channels variants

Julien Stephan
2024-05-28T14:20:45Z

Add support for ad7380/1/2/3-4 parts which are 4 channels
variants from ad7380/1/2/3

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
---
drivers/iio/adc/ad7380.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 75 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/ad7380.c b/drivers/iio/adc/ad7380.c
index 790d08c90ad0..6b0b1b0be363 100644
--- a/drivers/iio/adc/ad7380.c
+++ b/drivers/iio/adc/ad7380.c
@@ -8,6 +8,9 @@
* Datasheets of supported parts:
* ad7380/1 : https://www.analog.com/media/en/technical-documentation/data-sheets/AD7380-7381.pdf
* ad7383/4 : https://www.analog.com/media/en/technical-documentation/data-sheets/ad7383-7384.pdf
+ * ad7380-4 : https://www.analog.com/media/en/technical-documentation/data-sheets/ad7380-4.pdf
+ * ad7381-4 : https://www.analog.com/media/en/technical-documentation/data-sheets/ad7381-4.pdf
+ * ad7383/4-4 : https://www.analog.com/media/en/technical-documentation/data-sheets/ad7383-4-ad7384-4.pdf
*/

#include <linux/bitfield.h>
@@ -27,7 +30,7 @@
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>

-#define MAX_NUM_CHANNELS 2
+#define MAX_NUM_CHANNELS 4
/* 2.5V internal reference voltage */
#define AD7380_INTERNAL_REF_MV 2500

@@ -104,27 +107,53 @@ static const struct iio_chan_spec name[] = { \
IIO_CHAN_SOFT_TIMESTAMP(2), \
}

+#define DEFINE_AD7380_4_CHANNEL(name, bits, diff) \
+static const struct iio_chan_spec name[] = { \
+ AD7380_CHANNEL(0, bits, diff), \
+ AD7380_CHANNEL(1, bits, diff), \
+ AD7380_CHANNEL(2, bits, diff), \
+ AD7380_CHANNEL(3, bits, diff), \
+ IIO_CHAN_SOFT_TIMESTAMP(4), \
+}
+
/* fully differential */
DEFINE_AD7380_2_CHANNEL(ad7380_channels, 16, 1);
DEFINE_AD7380_2_CHANNEL(ad7381_channels, 14, 1);
+DEFINE_AD7380_4_CHANNEL(ad7380_4_channels, 16, 1);
+DEFINE_AD7380_4_CHANNEL(ad7381_4_channels, 14, 1);
/* pseudo differential */
DEFINE_AD7380_2_CHANNEL(ad7383_channels, 16, 0);
DEFINE_AD7380_2_CHANNEL(ad7384_channels, 14, 0);
+DEFINE_AD7380_4_CHANNEL(ad7383_4_channels, 16, 0);
+DEFINE_AD7380_4_CHANNEL(ad7384_4_channels, 14, 0);

static const char * const ad7380_2_channel_vcm_supplies[] = {
"aina", "ainb",
};

+static const char * const ad7380_4_channel_vcm_supplies[] = {
+ "aina", "ainb", "ainc", "aind",
+};
+
/* Since this is simultaneous sampling, we don't allow individual channels. */
static const unsigned long ad7380_2_channel_scan_masks[] = {
GENMASK(1, 0),
0
};

+static const unsigned long ad7380_4_channel_scan_masks[] = {
+ GENMASK(3, 0),
+ 0
+};
+
static const struct ad7380_timing_specs ad7380_timing = {
.t_csh_ns = 10,
};

+static const struct ad7380_timing_specs ad7380_4_timing = {
+ .t_csh_ns = 20,
+};
+
static const struct ad7380_chip_info ad7380_chip_info = {
.name = "ad7380",
.channels = ad7380_channels,
@@ -161,6 +190,42 @@ static const struct ad7380_chip_info ad7384_chip_info = {
.timing_specs = &ad7380_timing,
};

+static const struct ad7380_chip_info ad7380_4_chip_info = {
+ .name = "ad7380-4",
+ .channels = ad7380_4_channels,
+ .num_channels = ARRAY_SIZE(ad7380_4_channels),
+ .available_scan_masks = ad7380_4_channel_scan_masks,
+ .timing_specs = &ad7380_4_timing,
+};
+
+static const struct ad7380_chip_info ad7381_4_chip_info = {
+ .name = "ad7381-4",
+ .channels = ad7381_4_channels,
+ .num_channels = ARRAY_SIZE(ad7381_4_channels),
+ .available_scan_masks = ad7380_4_channel_scan_masks,
+ .timing_specs = &ad7380_4_timing,
+};
+
+static const struct ad7380_chip_info ad7383_4_chip_info = {
+ .name = "ad7383-4",
+ .channels = ad7383_4_channels,
+ .num_channels = ARRAY_SIZE(ad7383_4_channels),
+ .vcm_supplies = ad7380_4_channel_vcm_supplies,
+ .num_vcm_supplies = ARRAY_SIZE(ad7380_4_channel_vcm_supplies),
+ .available_scan_masks = ad7380_4_channel_scan_masks,
+ .timing_specs = &ad7380_4_timing,
+};
+
+static const struct ad7380_chip_info ad7384_4_chip_info = {
+ .name = "ad7384-4",
+ .channels = ad7384_4_channels,
+ .num_channels = ARRAY_SIZE(ad7384_4_channels),
+ .vcm_supplies = ad7380_4_channel_vcm_supplies,
+ .num_vcm_supplies = ARRAY_SIZE(ad7380_4_channel_vcm_supplies),
+ .available_scan_masks = ad7380_4_channel_scan_masks,
+ .timing_specs = &ad7380_4_timing,
+};
+
struct ad7380_state {
const struct ad7380_chip_info *chip_info;
struct spi_device *spi;
@@ -172,7 +237,7 @@ struct ad7380_state {
* transfer buffers to live in their own cache lines.
* Make the buffer large enough for MAX_NUM_CHANNELS 16-bit samples and one 64-bit
* aligned 64 bit timestamp.
- * As MAX_NUM_CHANNELS is 2 the layout of the structure is the same for all parts
+ * As MAX_NUM_CHANNELS is 4 the layout of the structure is the same for all parts
*/
struct {
u16 raw[MAX_NUM_CHANNELS];
@@ -512,6 +577,10 @@ static const struct of_device_id ad7380_of_match_table[] = {
{ .compatible = "adi,ad7381", .data = &ad7381_chip_info },
{ .compatible = "adi,ad7383", .data = &ad7383_chip_info },
{ .compatible = "adi,ad7384", .data = &ad7384_chip_info },
+ { .compatible = "adi,ad7380-4", .data = &ad7380_4_chip_info },
+ { .compatible = "adi,ad7381-4", .data = &ad7381_4_chip_info },
+ { .compatible = "adi,ad7383-4", .data = &ad7383_4_chip_info },
+ { .compatible = "adi,ad7384-4", .data = &ad7384_4_chip_info },
{ }
};

@@ -520,6 +589,10 @@ static const struct spi_device_id ad7380_id_table[] = {
{ "ad7381", (kernel_ulong_t)&ad7381_chip_info },
{ "ad7383", (kernel_ulong_t)&ad7383_chip_info },
{ "ad7384", (kernel_ulong_t)&ad7384_chip_info },
+ { "ad7380-4", (kernel_ulong_t)&ad7380_4_chip_info },
+ { "ad7381-4", (kernel_ulong_t)&ad7381_4_chip_info },
+ { "ad7383-4", (kernel_ulong_t)&ad7383_4_chip_info },
+ { "ad7384-4", (kernel_ulong_t)&ad7384_4_chip_info },
{ }
};
MODULE_DEVICE_TABLE(spi, ad7380_id_table);

--
2.44.0