[PATCH v5 3/3] iio: adc: Add ti-ads1110 support to ti-ads1100 driver
From: Jakub Szczudlo
Date: Sun Jun 28 2026 - 15:45:24 EST
Add ADS1110 support that have faster datarate than ADS1100, it also uses
internal voltage reference of 2.048V for measurement.
Signed-off-by: Jakub Szczudlo <jakubszczudlo40@xxxxxxxxx>
---
drivers/iio/adc/Kconfig | 9 ++--
drivers/iio/adc/ti-ads1100.c | 79 +++++++++++++++++++++++++++---------
2 files changed, 66 insertions(+), 22 deletions(-)
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 1c663c98c6c9..2459ff2af105 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -1765,11 +1765,14 @@ config TI_ADS1018
called ti-ads1018.
config TI_ADS1100
- tristate "Texas Instruments ADS1100 and ADS1000 ADC"
+ tristate "Texas Instruments ADS1100 and similar single channel I2C ADC"
depends on I2C
help
- If you say yes here you get support for Texas Instruments ADS1100 and
- ADS1000 ADC chips.
+ If you say yes here you get support for TI single channel I2C Analog
+ Devices.
+ * ADS1000 12-Bit, 128 MSPS Analog-to-Digital Converter
+ * ADS1100 16-Bit, 128 MSPS Analog-to-Digital Converter
+ * ADS1110 16-Bit, 240 MSPS Analog-to-Digital Converter
This driver can also be built as a module. If so, the module will be
called ti-ads1100.
diff --git a/drivers/iio/adc/ti-ads1100.c b/drivers/iio/adc/ti-ads1100.c
index 71b31adeba3c..c937e00e0a40 100644
--- a/drivers/iio/adc/ti-ads1100.c
+++ b/drivers/iio/adc/ti-ads1100.c
@@ -5,7 +5,7 @@
* Copyright (c) 2023, Topic Embedded Products
*
* Datasheet: https://www.ti.com/lit/gpn/ads1100
- * IIO driver for ADS1100 and ADS1000 ADC 16-bit I2C
+ * IIO driver for ADS1100 and similar single channel ADC 16-bit I2C
*/
#include <linux/bitfield.h>
@@ -41,20 +41,44 @@
#define ADS1100_SINGLESHOT ADS1100_CFG_SC
#define ADS1100_SLEEP_DELAY_MS 2000
+#define ADS1110_INTERNAL_REF_mV 2048
static const int ads1100_data_rate[] = { 128, 32, 16, 8 };
+static const int ads1110_data_rate[] = { 240, 60, 30, 15 };
static const int ads1100_data_rate_bits[] = { 12, 14, 15, 16 };
/* Timeout based on the minimum sample rate of 8 SPS (7500ms) */
#define ADS1100_MAX_DRDY_TIMEOUT_US (7500 * USEC_PER_MSEC)
+struct ads1100_config {
+ const char *name;
+ const int *available_data_rate_hz;
+ const int data_rate_count;
+ bool has_internal_vref_only;
+};
+
+static const struct ads1100_config ads1100_config = {
+ .name = "ads1100",
+ .available_data_rate_hz = ads1100_data_rate,
+ .data_rate_count = ARRAY_SIZE(ads1100_data_rate),
+ .has_internal_vref_only = false,
+};
+
+static const struct ads1100_config ads1110_config = {
+ .name = "ads1110",
+ .available_data_rate_hz = ads1110_data_rate,
+ .data_rate_count = ARRAY_SIZE(ads1110_data_rate),
+ .has_internal_vref_only = true,
+};
+
struct ads1100_data {
struct i2c_client *client;
struct regulator *reg_vdd;
struct mutex lock;
int scale_avail[2 * 4]; /* 4 gain settings */
+ const struct ads1100_config *ads_config;
u8 config;
- bool supports_data_rate; /* Only the ADS1100 can select the rate */
+ bool supports_data_rate;
};
static const struct iio_chan_spec ads1100_channel = {
@@ -90,6 +114,20 @@ static int ads1100_set_config_bits(struct ads1100_data *data, u8 mask, u8 value)
return 0;
};
+static int ads1100_get_vref_milivolts(struct ads1100_data *data)
+{
+ int voltage_uV;
+
+ if (data->ads_config->has_internal_vref_only)
+ return ADS1110_INTERNAL_REF_mV;
+
+ voltage_uV = regulator_get_voltage(data->reg_vdd);
+ if (voltage_uV < 0)
+ return voltage_uV;
+
+ return voltage_uV / (MICRO / MILLI);
+}
+
static int ads1100_data_bits(struct ads1100_data *data)
{
return ads1100_data_rate_bits[FIELD_GET(ADS1100_DR_MASK, data->config)];
@@ -181,7 +219,7 @@ static int ads1100_set_scale(struct ads1100_data *data, int val, int val2)
if (ret)
return ret;
- microvolts = regulator_get_voltage(data->reg_vdd);
+ microvolts = ads1100_get_vref_milivolts(data) * (MICRO / MILLI);
/*
* val2 is in 'micro' units, n = val2 / 1000000
* result must be millivolts, d = microvolts / 1000
@@ -204,7 +242,7 @@ static int ads1100_set_data_rate(struct ads1100_data *data, int chan, int rate)
unsigned int size;
int ret;
- size = data->supports_data_rate ? ARRAY_SIZE(ads1100_data_rate) : 1;
+ size = data->supports_data_rate ? data->ads_config->data_rate_count : 1;
for (i = 0; i < size; i++) {
if (i == size)
return -EINVAL;
@@ -225,14 +263,9 @@ static int ads1100_set_data_rate(struct ads1100_data *data, int chan, int rate)
return -EINVAL;
}
-static int ads1100_get_vdd_millivolts(struct ads1100_data *data)
-{
- return regulator_get_voltage(data->reg_vdd) / (MICRO / MILLI);
-}
-
static void ads1100_calc_scale_avail(struct ads1100_data *data)
{
- int millivolts = ads1100_get_vdd_millivolts(data);
+ int millivolts = ads1100_get_vref_milivolts(data);
unsigned int i;
for (i = 0; i < ARRAY_SIZE(data->scale_avail) / 2; i++) {
@@ -254,9 +287,9 @@ static int ads1100_read_avail(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
*type = IIO_VAL_INT;
- *vals = ads1100_data_rate;
+ *vals = data->ads_config->available_data_rate_hz;
if (data->supports_data_rate)
- *length = ARRAY_SIZE(ads1100_data_rate);
+ *length = data->ads_config->data_rate_count;
else
*length = 1;
return IIO_AVAIL_LIST;
@@ -275,6 +308,7 @@ static int ads1100_read_raw(struct iio_dev *indio_dev,
int *val2, long mask)
{
int ret;
+ int data_rate_index;
struct ads1100_data *data = iio_priv(indio_dev);
guard(mutex)(&data->lock);
@@ -291,12 +325,12 @@ static int ads1100_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
/* full-scale is the supply voltage in millivolts */
- *val = ads1100_get_vdd_millivolts(data);
+ *val = ads1100_get_vref_milivolts(data);
*val2 = 15 + FIELD_GET(ADS1100_PGA_MASK, data->config);
return IIO_VAL_FRACTIONAL_LOG2;
case IIO_CHAN_INFO_SAMP_FREQ:
- *val = ads1100_data_rate[FIELD_GET(ADS1100_DR_MASK,
- data->config)];
+ data_rate_index = FIELD_GET(ADS1100_DR_MASK, data->config);
+ *val = data->ads_config->available_data_rate_hz[data_rate_index];
return IIO_VAL_INT;
default:
return -EINVAL;
@@ -396,6 +430,11 @@ static int ads1100_probe(struct i2c_client *client)
if (ret)
return ret;
+ data->ads_config = i2c_get_match_data(client);
+ if (!data->ads_config)
+ return dev_err_probe(dev, -EINVAL,
+ "Can't get device data from firmware\n");
+
ret = ads1100_setup(data);
if (ret)
return dev_err_probe(dev, ret,
@@ -458,16 +497,18 @@ static DEFINE_RUNTIME_DEV_PM_OPS(ads1100_pm_ops,
NULL);
static const struct i2c_device_id ads1100_id[] = {
- { .name = "ads1100" },
- { .name = "ads1000" },
+ { .name = "ads1000", .driver_data = (kernel_ulong_t)&ads1100_config },
+ { .name = "ads1100", .driver_data = (kernel_ulong_t)&ads1100_config },
+ { .name = "ads1110", .driver_data = (kernel_ulong_t)&ads1110_config },
{ }
};
MODULE_DEVICE_TABLE(i2c, ads1100_id);
static const struct of_device_id ads1100_of_match[] = {
- {.compatible = "ti,ads1100" },
- {.compatible = "ti,ads1000" },
+ { .compatible = "ti,ads1000", .data = &ads1100_config },
+ { .compatible = "ti,ads1100", .data = &ads1100_config },
+ { .compatible = "ti,ads1110", .data = &ads1110_config },
{ }
};
--
2.47.3