[PATCH v6 5/5] iio: adc: ad7192: Add AD7194 support
From: Alisa-Dariana Roman
Date: Wed Apr 17 2024 - 13:04:24 EST
Unlike the other AD719Xs, AD7194 has configurable differential
channels. The user can dynamically configure them in the devicetree.
Also modify config AD7192 description for better scaling.
Signed-off-by: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>
---
drivers/iio/adc/Kconfig | 11 +++-
drivers/iio/adc/ad7192.c | 122 +++++++++++++++++++++++++++++++++++++--
2 files changed, 126 insertions(+), 7 deletions(-)
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 8db68b80b391..74fecc284f1a 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -88,12 +88,17 @@ config AD7173
called ad7173.
config AD7192
- tristate "Analog Devices AD7190 AD7192 AD7193 AD7195 ADC driver"
+ tristate "Analog Devices AD7192 and similar ADC driver"
depends on SPI
select AD_SIGMA_DELTA
help
- Say yes here to build support for Analog Devices AD7190,
- AD7192, AD7193 or AD7195 SPI analog to digital converters (ADC).
+ Say yes here to build support for Analog Devices SPI analog to digital
+ converters (ADC):
+ - AD7190
+ - AD7192
+ - AD7193
+ - AD7194
+ - AD7195
If unsure, say N (but it's safe to say "Y").
To compile this driver as a module, choose M here: the
diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
index 8d56cf889973..dc113405f1bc 100644
--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * AD7190 AD7192 AD7193 AD7195 SPI ADC driver
+ * AD7192 and similar SPI ADC driver
*
* Copyright 2011-2015 Analog Devices Inc.
*/
@@ -128,10 +128,21 @@
#define AD7193_CH_AIN8 0x480 /* AIN7 - AINCOM */
#define AD7193_CH_AINCOM 0x600 /* AINCOM - AINCOM */
+#define AD7194_CH_POS(x) (((x) - 1) << 4)
+#define AD7194_CH_NEG(x) ((x) - 1)
+#define AD7194_CH_DIFF(pos, neg) \
+ (((neg) == 0 ? BIT(10) : AD7194_CH_NEG(neg)) | AD7194_CH_POS(pos))
+#define AD7194_CH_TEMP 0x100 /* Temp sensor */
+#define AD7194_CH_BASE_NR 18
+#define AD7194_CH_AIN_START 1
+#define AD7194_CH_AIN_NR 16
+#define AD7194_CH_DIFF_NR_MAX 256
+
/* ID Register Bit Designations (AD7192_REG_ID) */
#define CHIPID_AD7190 0x4
#define CHIPID_AD7192 0x0
#define CHIPID_AD7193 0x2
+#define CHIPID_AD7194 0x3
#define CHIPID_AD7195 0x6
#define AD7192_ID_MASK GENMASK(3, 0)
@@ -169,6 +180,7 @@ enum {
ID_AD7190,
ID_AD7192,
ID_AD7193,
+ ID_AD7194,
ID_AD7195,
};
@@ -178,6 +190,7 @@ struct ad7192_chip_info {
const struct iio_chan_spec *channels;
u8 num_channels;
const struct iio_info *info;
+ int (*parse_channels)(struct iio_dev *indio_dev);
};
struct ad7192_state {
@@ -931,6 +944,15 @@ static const struct iio_info ad7192_info = {
.update_scan_mode = ad7192_update_scan_mode,
};
+static const struct iio_info ad7194_info = {
+ .read_raw = ad7192_read_raw,
+ .write_raw = ad7192_write_raw,
+ .write_raw_get_fmt = ad7192_write_raw_get_fmt,
+ .read_avail = ad7192_read_avail,
+ .validate_trigger = ad_sd_validate_trigger,
+ .update_scan_mode = ad7192_update_scan_mode,
+};
+
static const struct iio_info ad7195_info = {
.read_raw = ad7192_read_raw,
.write_raw = ad7192_write_raw,
@@ -1022,6 +1044,84 @@ static const struct iio_chan_spec ad7193_channels[] = {
IIO_CHAN_SOFT_TIMESTAMP(14),
};
+static int ad7194_parse_channel(struct fwnode_handle *child,
+ struct iio_chan_spec *ad7194_channel)
+{
+ u32 ain[2];
+ int ret;
+
+ ret = fwnode_property_read_u32_array(child, "diff-channels", ain,
+ ARRAY_SIZE(ain));
+ if (ret)
+ return ret;
+
+ if (!in_range(ain[0], AD7194_CH_AIN_START, AD7194_CH_AIN_NR) ||
+ !in_range(ain[1], AD7194_CH_AIN_START, AD7194_CH_AIN_NR))
+ return -EINVAL;
+
+ ad7194_channel->channel = ain[0];
+ ad7194_channel->channel2 = ain[1];
+ ad7194_channel->address = AD7194_CH_DIFF(ain[0], ain[1]);
+
+ return 0;
+}
+
+static int ad7194_parse_channels(struct iio_dev *indio_dev)
+{
+ struct device *dev = indio_dev->dev.parent;
+ struct iio_chan_spec *ad7194_channels;
+ struct fwnode_handle *child;
+ struct iio_chan_spec ad7194_chan = AD7193_CHANNEL(0, 0, 0);
+ struct iio_chan_spec ad7194_chan_diff = AD7193_DIFF_CHANNEL(0, 0, 0, 0);
+ struct iio_chan_spec ad7194_chan_temp = AD719x_TEMP_CHANNEL(0, 0);
+ struct iio_chan_spec ad7194_chan_timestamp = IIO_CHAN_SOFT_TIMESTAMP(0);
+ unsigned int num_channels, index = 0, ain_chan;
+ int ret;
+
+ num_channels = device_get_child_node_count(dev);
+ if (num_channels > AD7194_CH_DIFF_NR_MAX)
+ return -EINVAL;
+
+ num_channels += AD7194_CH_BASE_NR;
+
+ ad7194_channels = devm_kcalloc(dev, num_channels,
+ sizeof(*ad7194_channels), GFP_KERNEL);
+ if (!ad7194_channels)
+ return -ENOMEM;
+
+ indio_dev->channels = ad7194_channels;
+ indio_dev->num_channels = num_channels;
+
+ device_for_each_child_node(dev, child) {
+ *ad7194_channels = ad7194_chan_diff;
+ ad7194_channels->scan_index = index++;
+ ret = ad7194_parse_channel(child, ad7194_channels);
+ if (ret) {
+ fwnode_handle_put(child);
+ return ret;
+ }
+ ad7194_channels++;
+ }
+
+ *ad7194_channels = ad7194_chan_temp;
+ ad7194_channels->scan_index = index++;
+ ad7194_channels->address = AD7194_CH_TEMP;
+ ad7194_channels++;
+
+ for (ain_chan = 1; ain_chan <= 16; ain_chan++) {
+ *ad7194_channels = ad7194_chan;
+ ad7194_channels->scan_index = index++;
+ ad7194_channels->channel = ain_chan;
+ ad7194_channels->address = AD7194_CH_DIFF(ain_chan, 0);
+ ad7194_channels++;
+ }
+
+ *ad7194_channels = ad7194_chan_timestamp;
+ ad7194_channels->scan_index = index;
+
+ return 0;
+}
+
static const struct ad7192_chip_info ad7192_chip_info_tbl[] = {
[ID_AD7190] = {
.chip_id = CHIPID_AD7190,
@@ -1044,6 +1144,12 @@ static const struct ad7192_chip_info ad7192_chip_info_tbl[] = {
.num_channels = ARRAY_SIZE(ad7193_channels),
.info = &ad7192_info,
},
+ [ID_AD7194] = {
+ .chip_id = CHIPID_AD7194,
+ .name = "ad7194",
+ .info = &ad7194_info,
+ .parse_channels = ad7194_parse_channels,
+ },
[ID_AD7195] = {
.chip_id = CHIPID_AD7195,
.name = "ad7195",
@@ -1148,9 +1254,15 @@ static int ad7192_probe(struct spi_device *spi)
indio_dev->name = st->chip_info->name;
indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = st->chip_info->channels;
- indio_dev->num_channels = st->chip_info->num_channels;
indio_dev->info = st->chip_info->info;
+ if (st->chip_info->parse_channels) {
+ ret = st->chip_info->parse_channels(indio_dev);
+ if (ret)
+ return ret;
+ } else {
+ indio_dev->channels = st->chip_info->channels;
+ indio_dev->num_channels = st->chip_info->num_channels;
+ }
ret = ad_sd_init(&st->sd, indio_dev, spi, &ad7192_sigma_delta_info);
if (ret)
@@ -1189,6 +1301,7 @@ static const struct of_device_id ad7192_of_match[] = {
{ .compatible = "adi,ad7190", .data = &ad7192_chip_info_tbl[ID_AD7190] },
{ .compatible = "adi,ad7192", .data = &ad7192_chip_info_tbl[ID_AD7192] },
{ .compatible = "adi,ad7193", .data = &ad7192_chip_info_tbl[ID_AD7193] },
+ { .compatible = "adi,ad7194", .data = &ad7192_chip_info_tbl[ID_AD7194] },
{ .compatible = "adi,ad7195", .data = &ad7192_chip_info_tbl[ID_AD7195] },
{}
};
@@ -1198,6 +1311,7 @@ static const struct spi_device_id ad7192_ids[] = {
{ "ad7190", (kernel_ulong_t)&ad7192_chip_info_tbl[ID_AD7190] },
{ "ad7192", (kernel_ulong_t)&ad7192_chip_info_tbl[ID_AD7192] },
{ "ad7193", (kernel_ulong_t)&ad7192_chip_info_tbl[ID_AD7193] },
+ { "ad7194", (kernel_ulong_t)&ad7192_chip_info_tbl[ID_AD7194] },
{ "ad7195", (kernel_ulong_t)&ad7192_chip_info_tbl[ID_AD7195] },
{}
};
@@ -1214,6 +1328,6 @@ static struct spi_driver ad7192_driver = {
module_spi_driver(ad7192_driver);
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@xxxxxxxxxx>");
-MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC");
+MODULE_DESCRIPTION("Analog Devices AD7192 and similar ADC");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(IIO_AD_SIGMA_DELTA);
--
2.34.1