[PATCH 3/3] iio: adc: ad7192: Add AD7194 support
From: alisadariana
Date: Sun Nov 05 2023 - 14:32:38 EST
From: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>
Unlike the other AD719Xs, AD7194 has configurable differential
channels. The default configuration for these channels can be changed
from the devicetree.
The default configuration is hardcoded in order to have a stable number
of channels.
Signed-off-by: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx>
---
drivers/iio/adc/Kconfig | 4 +-
drivers/iio/adc/ad7192.c | 144 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 144 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 1e2b7a2c67c6..020d37457d81 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -55,12 +55,12 @@ config AD7124
called ad7124.
config AD7192
- tristate "Analog Devices AD7190 AD7192 AD7193 AD7195 ADC driver"
+ tristate "Analog Devices AD7190 AD7192 AD7193 AD7194 AD7195 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).
+ AD7192, AD7193, AD7194 or AD7195 SPI analog to digital converters (ADC).
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 48e0357564af..9c716c5c18b3 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
+ * AD7190 AD7192 AD7193 AD7194 AD7195 SPI ADC driver
*
* Copyright 2011-2015 Analog Devices Inc.
*/
@@ -125,10 +125,39 @@
#define AD7193_CH_AIN8 0x480 /* AIN7 - AINCOM */
#define AD7193_CH_AINCOM 0x600 /* AINCOM - AINCOM */
+#define AD7194_CH_TEMP 0x100 /* Temp sensor */
+#define AD7194_CH_AIN1 0x400 /* AIN1 - AINCOM */
+#define AD7194_CH_AIN2 0x410 /* AIN2 - AINCOM */
+#define AD7194_CH_AIN3 0x420 /* AIN3 - AINCOM */
+#define AD7194_CH_AIN4 0x430 /* AIN4 - AINCOM */
+#define AD7194_CH_AIN5 0x440 /* AIN5 - AINCOM */
+#define AD7194_CH_AIN6 0x450 /* AIN6 - AINCOM */
+#define AD7194_CH_AIN7 0x460 /* AIN7 - AINCOM */
+#define AD7194_CH_AIN8 0x470 /* AIN8 - AINCOM */
+#define AD7194_CH_AIN9 0x480 /* AIN9 - AINCOM */
+#define AD7194_CH_AIN10 0x490 /* AIN10 - AINCOM */
+#define AD7194_CH_AIN11 0x4A0 /* AIN11 - AINCOM */
+#define AD7194_CH_AIN12 0x4B0 /* AIN12 - AINCOM */
+#define AD7194_CH_AIN13 0x4C0 /* AIN13 - AINCOM */
+#define AD7194_CH_AIN14 0x4D0 /* AIN14 - AINCOM */
+#define AD7194_CH_AIN15 0x4E0 /* AIN15 - AINCOM */
+#define AD7194_CH_AIN16 0x4F0 /* AIN16 - AINCOM */
+#define AD7194_CH_POS_MASK GENMASK(7, 4)
+#define AD7194_CH_POS(x) FIELD_PREP(AD7194_CH_POS_MASK, (x))
+#define AD7194_CH_NEG_MASK GENMASK(3, 0)
+#define AD7194_CH_NEG(x) FIELD_PREP(AD7194_CH_NEG_MASK, (x))
+#define AD7194_CH_DIFF(pos, neg) \
+ (AD7194_CH_POS(pos) | AD7194_CH_NEG(neg))
+#define AD7194_CH_DIFF_NR_MIN 0
+#define AD7194_CH_DIFF_NR_MAX 7
+#define AD7194_CH_AIN_MIN 1
+#define AD7194_CH_AIN_MAX 16
+
/* 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)
@@ -166,6 +195,7 @@ enum {
ID_AD7190,
ID_AD7192,
ID_AD7193,
+ ID_AD7194,
ID_AD7195,
};
@@ -644,6 +674,15 @@ static const struct attribute_group ad7192_attribute_group = {
.attrs = ad7192_attributes,
};
+static struct attribute *ad7194_attributes[] = {
+ &iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group ad7194_attribute_group = {
+ .attrs = ad7194_attributes,
+};
+
static struct attribute *ad7195_attributes[] = {
&iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr,
&iio_dev_attr_bridge_switch_en.dev_attr.attr,
@@ -928,6 +967,16 @@ 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,
+ .attrs = &ad7194_attribute_group,
+ .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,
@@ -1017,6 +1066,35 @@ static const struct iio_chan_spec ad7193_channels[] = {
IIO_CHAN_SOFT_TIMESTAMP(14),
};
+static struct iio_chan_spec ad7194_channels[] = {
+ AD7193_DIFF_CHANNEL(0, 1, 2, 0x001),
+ AD7193_DIFF_CHANNEL(1, 3, 4, 0x023),
+ AD7193_DIFF_CHANNEL(2, 5, 6, 0x045),
+ AD7193_DIFF_CHANNEL(3, 7, 8, 0x067),
+ AD7193_DIFF_CHANNEL(4, 9, 10, 0x089),
+ AD7193_DIFF_CHANNEL(5, 11, 12, 0x0AB),
+ AD7193_DIFF_CHANNEL(6, 13, 14, 0x0CD),
+ AD7193_DIFF_CHANNEL(7, 15, 16, 0x0EF),
+ AD719x_TEMP_CHANNEL(8, AD7194_CH_TEMP),
+ AD7193_CHANNEL(9, 1, AD7194_CH_AIN1),
+ AD7193_CHANNEL(10, 2, AD7194_CH_AIN2),
+ AD7193_CHANNEL(11, 3, AD7194_CH_AIN3),
+ AD7193_CHANNEL(12, 4, AD7194_CH_AIN4),
+ AD7193_CHANNEL(13, 5, AD7194_CH_AIN5),
+ AD7193_CHANNEL(14, 6, AD7194_CH_AIN6),
+ AD7193_CHANNEL(15, 7, AD7194_CH_AIN7),
+ AD7193_CHANNEL(16, 8, AD7194_CH_AIN8),
+ AD7193_CHANNEL(17, 9, AD7194_CH_AIN9),
+ AD7193_CHANNEL(18, 10, AD7194_CH_AIN10),
+ AD7193_CHANNEL(19, 11, AD7194_CH_AIN11),
+ AD7193_CHANNEL(20, 12, AD7194_CH_AIN12),
+ AD7193_CHANNEL(21, 13, AD7194_CH_AIN13),
+ AD7193_CHANNEL(22, 14, AD7194_CH_AIN14),
+ AD7193_CHANNEL(23, 15, AD7194_CH_AIN15),
+ AD7193_CHANNEL(24, 16, AD7194_CH_AIN16),
+ IIO_CHAN_SOFT_TIMESTAMP(25),
+};
+
static const struct ad7192_chip_info ad7192_chip_info_tbl[] = {
[ID_AD7190] = {
.chip_id = CHIPID_AD7190,
@@ -1039,6 +1117,13 @@ 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",
+ .channels = ad7194_channels,
+ .num_channels = ARRAY_SIZE(ad7194_channels),
+ .info = &ad7194_info,
+ },
[ID_AD7195] = {
.chip_id = CHIPID_AD7195,
.name = "ad7195",
@@ -1053,6 +1138,53 @@ static void ad7192_reg_disable(void *reg)
regulator_disable(reg);
}
+static int ad7192_parse_channel(struct iio_dev *indio_dev,
+ struct fwnode_handle *child)
+{
+ u32 reg, ain[2];
+ int ret;
+
+ ret = fwnode_property_read_u32(child, "reg", ®);
+ if (ret)
+ return ret;
+
+ if (reg < AD7194_CH_DIFF_NR_MIN || reg > AD7194_CH_DIFF_NR_MAX)
+ return -EINVAL;
+
+ ret = fwnode_property_read_u32_array(child, "diff-channels", ain,
+ ARRAY_SIZE(ain));
+ if (ret)
+ return ret;
+
+ if (ain[0] < AD7194_CH_AIN_MIN || ain[0] > AD7194_CH_AIN_MAX ||
+ ain[1] < AD7194_CH_AIN_MIN || ain[1] > AD7194_CH_AIN_MAX)
+ return -EINVAL;
+
+ ad7194_channels[reg].channel = ain[0];
+ ad7194_channels[reg].channel2 = ain[1];
+ ad7194_channels[reg].address = AD7194_CH_DIFF(ain[0], ain[1]);
+
+ return 0;
+}
+
+static int ad7192_parse_channels(struct iio_dev *indio_dev)
+{
+ struct ad7192_state *st = iio_priv(indio_dev);
+ struct device *dev = &st->sd.spi->dev;
+ struct fwnode_handle *child;
+ int ret;
+
+ device_for_each_child_node(dev, child) {
+ ret = ad7192_parse_channel(indio_dev, child);
+ if (ret) {
+ fwnode_handle_put(child);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
static int ad7192_probe(struct spi_device *spi)
{
struct ad7192_state *st;
@@ -1150,6 +1282,12 @@ static int ad7192_probe(struct spi_device *spi)
}
}
+ if (st->chip_info->chip_id == CHIPID_AD7194) {
+ ret = ad7192_parse_channels(indio_dev);
+ if (ret)
+ return ret;
+ }
+
ret = ad7192_setup(indio_dev);
if (ret)
return ret;
@@ -1161,6 +1299,7 @@ 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] },
{}
};
@@ -1170,6 +1309,7 @@ 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] },
{}
};
@@ -1186,6 +1326,6 @@ 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 AD7190, AD7192, AD7193, AD7194, AD7195 ADC");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(IIO_AD_SIGMA_DELTA);
--
2.34.1