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iio:adc128s052: add support for adc122s021

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Signed-off-by: Urs Fässler <urs.fassler@bytesatwork.ch>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Urs Fässler 2015-05-18 15:22:44 +02:00 committed by Jonathan Cameron
parent 1ce87f21ed
commit 2a67dfba7f
3 changed files with 28 additions and 10 deletions
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4
Documentation/devicetree/bindings/iio/adc/ti-adc128s052.txt
View File

@ -1,7 +1,7 @@
* Texas Instruments' ADC128S052 ADC chip
* Texas Instruments' ADC128S052 and ADC122S021 ADC chip
Required properties:
- compatible: Should be "ti,adc128s052"
- compatible: Should be "ti,adc128s052" or "ti,adc122s021"
- reg: spi chip select number for the device
- vref-supply: The regulator supply for ADC reference voltage

4
drivers/iio/adc/Kconfig
View File

@ -292,11 +292,11 @@ config TI_ADC081C
called ti-adc081c.
config TI_ADC128S052
tristate "Texas Instruments ADC128S052"
tristate "Texas Instruments ADC128S052/ADC122S021"
depends on SPI
help
If you say yes here you get support for Texas Instruments ADC128S052
chip.
and ADC122S021 chips.
This driver can also be built as a module. If so, the module will be
called ti-adc128s052.

30
drivers/iio/adc/ti-adc128s052.c
View File

@ -1,9 +1,10 @@
/*
* Copyright (C) 2014 Angelo Compagnucci <angelo.compagnucci@gmail.com>
*
* Driver for Texas Instruments' ADC128S052 ADC chip.
* Datasheet can be found here:
* Driver for Texas Instruments' ADC128S052 and ADC122S021 ADC chip.
* Datasheets can be found here:
* http://www.ti.com/lit/ds/symlink/adc128s052.pdf
* http://www.ti.com/lit/ds/symlink/adc122s021.pdf
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -16,6 +17,11 @@
#include <linux/iio/iio.h>
#include <linux/regulator/consumer.h>
struct adc128_configuration {
const struct iio_chan_spec *channels;
u8 num_channels;
};
struct adc128 {
struct spi_device *spi;
@ -92,7 +98,7 @@ static int adc128_read_raw(struct iio_dev *indio_dev,
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \
}
static const struct iio_chan_spec adc128_channels[] = {
static const struct iio_chan_spec adc128s052_channels[] = {
ADC128_VOLTAGE_CHANNEL(0),
ADC128_VOLTAGE_CHANNEL(1),
ADC128_VOLTAGE_CHANNEL(2),
@ -103,6 +109,16 @@ static const struct iio_chan_spec adc128_channels[] = {
ADC128_VOLTAGE_CHANNEL(7),
};
static const struct iio_chan_spec adc122s021_channels[] = {
ADC128_VOLTAGE_CHANNEL(0),
ADC128_VOLTAGE_CHANNEL(1),
};
static const struct adc128_configuration adc128_config[] = {
{ adc128s052_channels, ARRAY_SIZE(adc128s052_channels) },
{ adc122s021_channels, ARRAY_SIZE(adc122s021_channels) },
};
static const struct iio_info adc128_info = {
.read_raw = adc128_read_raw,
.driver_module = THIS_MODULE,
@ -112,6 +128,7 @@ static int adc128_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
struct adc128 *adc;
int config = spi_get_device_id(spi)->driver_data;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
@ -128,8 +145,8 @@ static int adc128_probe(struct spi_device *spi)
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &adc128_info;
indio_dev->channels = adc128_channels;
indio_dev->num_channels = ARRAY_SIZE(adc128_channels);
indio_dev->channels = adc128_config[config].channels;
indio_dev->num_channels = adc128_config[config].num_channels;
adc->reg = devm_regulator_get(&spi->dev, "vref");
if (IS_ERR(adc->reg))
@ -158,7 +175,8 @@ static int adc128_remove(struct spi_device *spi)
}
static const struct spi_device_id adc128_id[] = {
{ "adc128s052", 0},
{ "adc128s052", 0}, /* index into adc128_config */
{ "adc122s021", 1},
{ }
};
MODULE_DEVICE_TABLE(spi, adc128_id);