[PATCH v3 2/3] iio: adc: Add ti-ads1110 support to ti-ads1100 driver
From: Jakub Szczudlo
Date: Sat Jun 13 2026 - 15:11:12 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 | 6 +--
drivers/iio/adc/ti-ads1100.c | 83 +++++++++++++++++++++++++++---------
2 files changed, 65 insertions(+), 24 deletions(-)
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index a9dedbb8eb46..54a0149a3838 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -1747,11 +1747,11 @@ 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 TI ADS1100 and similar single
+ channel I2C Analog to Digital Converters
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 aa8946063c7d..76de2466dc53 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>
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
+#include <linux/iopoll.h>
#include <linux/mutex.h>
#include <linux/property.h>
#include <linux/pm_runtime.h>
@@ -39,17 +40,41 @@
#define ADS1100_SINGLESHOT ADS1100_CFG_SC
#define ADS1100_SLEEP_DELAY_MS 2000
+#define ADS1110_REFERENCE_VOLTAGE_MILIVOLTS 2048
+
+/* Timeout based on the minimum sample rate of 8 SPS (7500000us) */
+#define ADS1100_MAX_DRDY_TIMEOUT 7500000
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 };
+struct ads1100_config {
+ const char *name;
+ const int *data_rate;
+ bool has_reference_voltage;
+};
+
+static const struct ads1100_config ads1100_config = {
+ .name = "ads1100",
+ .data_rate = ads1100_data_rate,
+ .has_reference_voltage = false,
+};
+
+static const struct ads1100_config ads1110_config = {
+ .name = "ads1110",
+ .data_rate = ads1110_data_rate,
+ .has_reference_voltage = true,
+};
+
struct ads1100_data {
struct i2c_client *client;
struct regulator *reg_vdd;
struct mutex lock;
int scale_avail[2 * 4]; /* 4 gain settings */
+ struct ads1100_config *ads_config;
u8 config;
- bool supports_data_rate; /* Only the ADS1100 can select the rate */
+ bool supports_data_rate; /* Only the ADS1100/ADS1110 can select the rate */
};
static const struct iio_chan_spec ads1100_channel = {
@@ -85,6 +110,19 @@ static int ads1100_set_config_bits(struct ads1100_data *data, u8 mask, u8 value)
return 0;
};
+static int ads1100_get_voltage_milivolts(struct ads1100_data *data)
+{
+ if (data->ads_config->has_reference_voltage)
+ return ADS1110_REFERENCE_VOLTAGE_MILIVOLTS;
+ else
+ return regulator_get_voltage(data->reg_vdd) / MILLI;
+}
+
+static int ads1100_get_voltage_microvolts(struct ads1100_data *data)
+{
+ return ads1100_get_voltage_milivolts(data) * MICRO / MILLI;
+}
+
static int ads1100_data_bits(struct ads1100_data *data)
{
return ads1100_data_rate_bits[FIELD_GET(ADS1100_DR_MASK, data->config)];
@@ -107,9 +145,9 @@ static int ads1100_get_adc_result(struct ads1100_data *data, int chan, int *val)
pm_runtime_put_autosuspend(&data->client->dev);
- if (ret < 0) {
+ if (ret < 2) {
dev_err(&data->client->dev, "I2C read fail: %d\n", ret);
- return ret;
+ return -EIO;
}
/* Value is always 16-bit 2's complement */
@@ -135,7 +173,7 @@ static int ads1100_set_scale(struct ads1100_data *data, int val, int val2)
if (!val2)
return -EINVAL;
- microvolts = regulator_get_voltage(data->reg_vdd);
+ microvolts = ads1100_get_voltage_microvolts(data);
/*
* val2 is in 'micro' units, n = val2 / 1000000
* result must be millivolts, d = microvolts / 1000
@@ -159,22 +197,17 @@ static int ads1100_set_data_rate(struct ads1100_data *data, int chan, int rate)
size = data->supports_data_rate ? ARRAY_SIZE(ads1100_data_rate) : 1;
for (i = 0; i < size; i++) {
- if (ads1100_data_rate[i] == rate)
+ if (data->ads_config->data_rate[i] == rate)
return ads1100_set_config_bits(data, ADS1100_DR_MASK,
- FIELD_PREP(ADS1100_DR_MASK, i));
+ FIELD_PREP(ADS1100_DR_MASK, i));
}
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_voltage_milivolts(data);
unsigned int i;
for (i = 0; i < ARRAY_SIZE(data->scale_avail) / 2; i++) {
@@ -196,7 +229,7 @@ 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->data_rate;
if (data->supports_data_rate)
*length = ARRAY_SIZE(ads1100_data_rate);
else
@@ -233,12 +266,11 @@ 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_voltage_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)];
+ *val = data->ads_config->data_rate[FIELD_GET(ADS1100_DR_MASK, data->config)];
return IIO_VAL_INT;
default:
return -EINVAL;
@@ -307,6 +339,7 @@ static int ads1100_probe(struct i2c_client *client)
struct iio_dev *indio_dev;
struct ads1100_data *data;
struct device *dev = &client->dev;
+ const struct ads1100_config *model;
int ret;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
@@ -338,6 +371,12 @@ static int ads1100_probe(struct i2c_client *client)
if (ret)
return ret;
+ model = device_get_match_data(dev);
+ if (!model)
+ return dev_err_probe(dev, -EINVAL,
+ "Can't get device data from firmware\n");
+
+ data->ads_config = (struct ads1100_config *)model;
ret = ads1100_setup(data);
if (ret)
return dev_err_probe(dev, ret,
@@ -400,16 +439,18 @@ static DEFINE_RUNTIME_DEV_PM_OPS(ads1100_pm_ops,
NULL);
static const struct i2c_device_id ads1100_id[] = {
- { "ads1100" },
- { "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