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iio: adc: ltc2309: add support for ltc2305

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Add support for the LTC2305 ADC to the LTC2309 driver. The LTC2305 is
a 2-channel, 12-bit SAR ADC that is register-compatible with the
LTC2309 but has a different channel selection mapping and count.

To support multiple chips in this family, introduce ltc2309_chip_info
struct to store chip-specific channel specifications and names.
The probe function now uses i2c_get_match_data() to retrieve the
correct configuration for the detected device.

Specific channel addresses for LTC2305 (CH0, CH1, and differential
pairs) are added based on the datasheet.

Signed-off-by: Kyle Hsieh <kylehsieh1995@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Kyle Hsieh
2026-03-25 10:24:22 +08:00
committed by Jonathan Cameron
parent 999ca38066
commit 8625d418d2
1 changed files with 44 additions and 5 deletions
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49
drivers/iio/adc/ltc2309.c
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@@ -1,8 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
/*
* The LTC2305 is a 2-Channel, 12-Bit SAR ADC with an I2C Interface.
* The LTC2309 is an 8-Channel, 12-Bit SAR ADC with an I2C Interface.
*
* Datasheet:
* https://www.analog.com/media/en/technical-documentation/data-sheets/23015fb.pdf
* https://www.analog.com/media/en/technical-documentation/data-sheets/2309fd.pdf
*
* Copyright (c) 2023, Liam Beguin <liambeguin@gmail.com>
@@ -41,6 +43,13 @@ struct ltc2309 {
};
/* Order matches expected channel address, See datasheet Table 1. */
enum ltc2305_channels {
LTC2305_CH0_CH1 = 0x0,
LTC2305_CH1_CH0 = 0x4,
LTC2305_CH0 = 0x8,
LTC2305_CH1 = 0xc,
};
enum ltc2309_channels {
LTC2309_CH0_CH1 = 0x0,
LTC2309_CH2_CH3 = 0x1,
@@ -80,6 +89,13 @@ enum ltc2309_channels {
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
}
static const struct iio_chan_spec ltc2305_channels[] = {
LTC2309_CHAN(0, LTC2305_CH0),
LTC2309_CHAN(1, LTC2305_CH1),
LTC2309_DIFF_CHAN(0, 1, LTC2305_CH0_CH1),
LTC2309_DIFF_CHAN(1, 0, LTC2305_CH1_CH0),
};
static const struct iio_chan_spec ltc2309_channels[] = {
LTC2309_CHAN(0, LTC2309_CH0),
LTC2309_CHAN(1, LTC2309_CH1),
@@ -99,6 +115,24 @@ static const struct iio_chan_spec ltc2309_channels[] = {
LTC2309_DIFF_CHAN(7, 6, LTC2309_CH7_CH6),
};
struct ltc2309_chip_info {
const char *name;
const struct iio_chan_spec *channels;
int num_channels;
};
static const struct ltc2309_chip_info ltc2305_chip_info = {
.name = "ltc2305",
.channels = ltc2305_channels,
.num_channels = ARRAY_SIZE(ltc2305_channels),
};
static const struct ltc2309_chip_info ltc2309_chip_info = {
.name = "ltc2309",
.channels = ltc2309_channels,
.num_channels = ARRAY_SIZE(ltc2309_channels),
};
static int ltc2309_read_raw_channel(struct ltc2309 *ltc2309,
unsigned long address, int *val)
{
@@ -158,6 +192,7 @@ static const struct iio_info ltc2309_info = {
static int ltc2309_probe(struct i2c_client *client)
{
const struct ltc2309_chip_info *chip_info;
struct iio_dev *indio_dev;
struct ltc2309 *ltc2309;
int ret;
@@ -167,13 +202,15 @@ static int ltc2309_probe(struct i2c_client *client)
return -ENOMEM;
ltc2309 = iio_priv(indio_dev);
chip_info = i2c_get_match_data(client);
ltc2309->dev = &indio_dev->dev;
ltc2309->client = client;
indio_dev->name = "ltc2309";
indio_dev->name = chip_info->name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = ltc2309_channels;
indio_dev->num_channels = ARRAY_SIZE(ltc2309_channels);
indio_dev->channels = chip_info->channels;
indio_dev->num_channels = chip_info->num_channels;
indio_dev->info = &ltc2309_info;
ret = devm_regulator_get_enable_read_voltage(&client->dev, "vref");
@@ -189,13 +226,15 @@ static int ltc2309_probe(struct i2c_client *client)
}
static const struct of_device_id ltc2309_of_match[] = {
{ .compatible = "lltc,ltc2309" },
{ .compatible = "lltc,ltc2305", .data = &ltc2305_chip_info },
{ .compatible = "lltc,ltc2309", .data = &ltc2309_chip_info },
{ }
};
MODULE_DEVICE_TABLE(of, ltc2309_of_match);
static const struct i2c_device_id ltc2309_id[] = {
{ "ltc2309" },
{ "ltc2305", (kernel_ulong_t)&ltc2305_chip_info },
{ "ltc2309", (kernel_ulong_t)&ltc2309_chip_info },
{ }
};
MODULE_DEVICE_TABLE(i2c, ltc2309_id);