The DS3502 is a 7-bit, nonvolatile digital potentiometer featuring an output voltage range of up to 15.5V. DS3502 support is implemented into existing DS1803 driver. Datasheet: https://datasheets.maximintegrated.com/en/ds/DS3502.pdf Signed-off-by: Jagath Jog J <jagathjog1996@xxxxxxxxx> --- drivers/iio/potentiometer/Kconfig | 6 +++--- drivers/iio/potentiometer/ds1803.c | 33 +++++++++++++++++++++++++++++- 2 files changed, 35 insertions(+), 4 deletions(-) diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig index 832df8da2bc6..01dd3f858d99 100644 --- a/drivers/iio/potentiometer/Kconfig +++ b/drivers/iio/potentiometer/Kconfig @@ -27,11 +27,11 @@ config AD5272 module will be called ad5272. config DS1803 - tristate "Maxim Integrated DS1803 Digital Potentiometer driver" + tristate "Maxim Integrated DS1803 and similar Digital Potentiometer driver" depends on I2C help - Say yes here to build support for the Maxim Integrated DS1803 - digital potentiometer chip. + Say yes here to build support for the Maxim Integrated DS1803 and + DS3502 digital potentiometer chip. To compile this driver as a module, choose M here: the module will be called ds1803. diff --git a/drivers/iio/potentiometer/ds1803.c b/drivers/iio/potentiometer/ds1803.c index 1d6175dc4319..e1e0e81270c0 100644 --- a/drivers/iio/potentiometer/ds1803.c +++ b/drivers/iio/potentiometer/ds1803.c @@ -1,12 +1,15 @@ // SPDX-License-Identifier: GPL-2.0-only /* - * Maxim Integrated DS1803 digital potentiometer driver + * Maxim Integrated DS1803 and similar digital potentiometer driver * Copyright (c) 2016 Slawomir Stepien + * Copyright (c) 2022 Jagath Jog J * * Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf + * Datasheet: https://datasheets.maximintegrated.com/en/ds/DS3502.pdf * * DEVID #Wipers #Positions Resistor Opts (kOhm) i2c address * ds1803 2 256 10, 50, 100 0101xxx + * ds3502 1 128 10 01010xx */ #include <linux/err.h> @@ -18,11 +21,13 @@ #define DS1803_WIPER_0 0xA9 #define DS1803_WIPER_1 0xAA +#define DS3502_WR_IVR 0x00 enum ds1803_type { DS1803_010, DS1803_050, DS1803_100, + DS3502, }; struct ds1803_cfg { @@ -56,6 +61,10 @@ static const struct iio_chan_spec ds1803_channels[] = { DS1803_CHANNEL(1, DS1803_WIPER_1), }; +static const struct iio_chan_spec ds3502_channels[] = { + DS1803_CHANNEL(0, DS3502_WR_IVR), +}; + static int ds1803_read(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val) @@ -72,6 +81,21 @@ static int ds1803_read(struct iio_dev *indio_dev, return ret; } +static int ds3502_read(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val) +{ + struct ds1803_data *data = iio_priv(indio_dev); + int ret; + + ret = i2c_smbus_read_byte_data(data->client, chan->address); + if (ret < 0) + return ret; + + *val = ret; + return ret; +} + static const struct ds1803_cfg ds1803_cfg[] = { [DS1803_010] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms = 10, .channels = ds1803_channels, @@ -85,6 +109,10 @@ static const struct ds1803_cfg ds1803_cfg[] = { .channels = ds1803_channels, .num_channels = ARRAY_SIZE(ds1803_channels), .read = ds1803_read }, + [DS3502] = { .wipers = 1, .avail = { 0, 1, 127 }, .kohms = 10, + .channels = ds3502_channels, + .num_channels = ARRAY_SIZE(ds3502_channels), + .read = ds3502_read }, }; static int ds1803_read_raw(struct iio_dev *indio_dev, @@ -186,6 +214,7 @@ static const struct of_device_id ds1803_dt_ids[] = { { .compatible = "maxim,ds1803-010", .data = &ds1803_cfg[DS1803_010] }, { .compatible = "maxim,ds1803-050", .data = &ds1803_cfg[DS1803_050] }, { .compatible = "maxim,ds1803-100", .data = &ds1803_cfg[DS1803_100] }, + { .compatible = "maxim,ds3502", .data = &ds1803_cfg[DS3502] }, {} }; MODULE_DEVICE_TABLE(of, ds1803_dt_ids); @@ -194,6 +223,7 @@ static const struct i2c_device_id ds1803_id[] = { { "ds1803-010", DS1803_010 }, { "ds1803-050", DS1803_050 }, { "ds1803-100", DS1803_100 }, + { "ds3502", DS3502 }, {} }; MODULE_DEVICE_TABLE(i2c, ds1803_id); @@ -210,5 +240,6 @@ static struct i2c_driver ds1803_driver = { module_i2c_driver(ds1803_driver); MODULE_AUTHOR("Slawomir Stepien <sst@xxxxxxxxx>"); +MODULE_AUTHOR("Jagath Jog J <jagathjog1996@xxxxxxxxx>"); MODULE_DESCRIPTION("DS1803 digital potentiometer"); MODULE_LICENSE("GPL v2"); -- 2.17.1
