iio: dac: AD8801: add Analog Devices AD8801/AD8803 support
Add support for Analog Devices AD8801/AD8803, 8 channels 8bits, Digital to Analog converters. Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Gwenhael Goavec-Merou
Jonathan Cameron
parent
9d1894cd19
commit
7f270bc9a2
|
|
@ -190,6 +190,16 @@ config CIO_DAC
|
|||
base port addresses for the devices may be configured via the base
|
||||
array module parameter.
|
||||
|
||||
config AD8801
|
||||
tristate "Analog Devices AD8801/AD8803 DAC driver"
|
||||
depends on SPI_MASTER
|
||||
help
|
||||
Say yes here to build support for Analog Devices AD8801, AD8803 Digital to
|
||||
Analog Converters (DAC).
|
||||
|
||||
To compile this driver as a module choose M here: the module will be called
|
||||
ad8801.
|
||||
|
||||
config LPC18XX_DAC
|
||||
tristate "NXP LPC18xx DAC driver"
|
||||
depends on ARCH_LPC18XX || COMPILE_TEST
|
||||
|
|
|
|||
|
|
@ -20,6 +20,7 @@ obj-$(CONFIG_AD5764) += ad5764.o
|
|||
obj-$(CONFIG_AD5791) += ad5791.o
|
||||
obj-$(CONFIG_AD5686) += ad5686.o
|
||||
obj-$(CONFIG_AD7303) += ad7303.o
|
||||
obj-$(CONFIG_AD8801) += ad8801.o
|
||||
obj-$(CONFIG_CIO_DAC) += cio-dac.o
|
||||
obj-$(CONFIG_LPC18XX_DAC) += lpc18xx_dac.o
|
||||
obj-$(CONFIG_M62332) += m62332.o
|
||||
|
|
|
|||
239
drivers/iio/dac/ad8801.c
Normal file
239
drivers/iio/dac/ad8801.c
Normal file
|
|
@ -0,0 +1,239 @@
|
|||
/*
|
||||
* IIO DAC driver for Analog Devices AD8801 DAC
|
||||
*
|
||||
* Copyright (C) 2016 Gwenhael Goavec-Merou
|
||||
* 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
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/iio/iio.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/regulator/consumer.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/sysfs.h>
|
||||
|
||||
#define AD8801_CFG_ADDR_OFFSET 8
|
||||
|
||||
enum ad8801_device_ids {
|
||||
ID_AD8801,
|
||||
ID_AD8803,
|
||||
};
|
||||
|
||||
struct ad8801_state {
|
||||
struct spi_device *spi;
|
||||
unsigned char dac_cache[8]; /* Value write on each channel */
|
||||
unsigned int vrefh_mv;
|
||||
unsigned int vrefl_mv;
|
||||
struct regulator *vrefh_reg;
|
||||
struct regulator *vrefl_reg;
|
||||
|
||||
__be16 data ____cacheline_aligned;
|
||||
};
|
||||
|
||||
static int ad8801_spi_write(struct ad8801_state *state,
|
||||
u8 channel, unsigned char value)
|
||||
{
|
||||
state->data = cpu_to_be16((channel << AD8801_CFG_ADDR_OFFSET) | value);
|
||||
return spi_write(state->spi, &state->data, sizeof(state->data));
|
||||
}
|
||||
|
||||
static int ad8801_write_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan, int val, int val2, long mask)
|
||||
{
|
||||
struct ad8801_state *state = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
if (val >= 256 || val < 0)
|
||||
return -EINVAL;
|
||||
|
||||
ret = ad8801_spi_write(state, chan->channel, val);
|
||||
if (ret == 0)
|
||||
state->dac_cache[chan->channel] = val;
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad8801_read_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan, int *val, int *val2, long info)
|
||||
{
|
||||
struct ad8801_state *state = iio_priv(indio_dev);
|
||||
|
||||
switch (info) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
*val = state->dac_cache[chan->channel];
|
||||
return IIO_VAL_INT;
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
*val = state->vrefh_mv - state->vrefl_mv;
|
||||
*val2 = 8;
|
||||
return IIO_VAL_FRACTIONAL_LOG2;
|
||||
case IIO_CHAN_INFO_OFFSET:
|
||||
*val = state->vrefl_mv;
|
||||
return IIO_VAL_INT;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static const struct iio_info ad8801_info = {
|
||||
.read_raw = ad8801_read_raw,
|
||||
.write_raw = ad8801_write_raw,
|
||||
.driver_module = THIS_MODULE,
|
||||
};
|
||||
|
||||
#define AD8801_CHANNEL(chan) { \
|
||||
.type = IIO_VOLTAGE, \
|
||||
.indexed = 1, \
|
||||
.output = 1, \
|
||||
.channel = chan, \
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
||||
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
|
||||
BIT(IIO_CHAN_INFO_OFFSET), \
|
||||
}
|
||||
|
||||
static const struct iio_chan_spec ad8801_channels[] = {
|
||||
AD8801_CHANNEL(0),
|
||||
AD8801_CHANNEL(1),
|
||||
AD8801_CHANNEL(2),
|
||||
AD8801_CHANNEL(3),
|
||||
AD8801_CHANNEL(4),
|
||||
AD8801_CHANNEL(5),
|
||||
AD8801_CHANNEL(6),
|
||||
AD8801_CHANNEL(7),
|
||||
};
|
||||
|
||||
static int ad8801_probe(struct spi_device *spi)
|
||||
{
|
||||
struct iio_dev *indio_dev;
|
||||
struct ad8801_state *state;
|
||||
const struct spi_device_id *id;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*state));
|
||||
if (indio_dev == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
state = iio_priv(indio_dev);
|
||||
state->spi = spi;
|
||||
id = spi_get_device_id(spi);
|
||||
|
||||
state->vrefh_reg = devm_regulator_get(&spi->dev, "vrefh");
|
||||
if (IS_ERR(state->vrefh_reg)) {
|
||||
dev_err(&spi->dev, "Vrefh regulator not specified\n");
|
||||
return PTR_ERR(state->vrefh_reg);
|
||||
}
|
||||
|
||||
ret = regulator_enable(state->vrefh_reg);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "Failed to enable vrefh regulator: %d\n",
|
||||
ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = regulator_get_voltage(state->vrefh_reg);
|
||||
if (ret < 0) {
|
||||
dev_err(&spi->dev, "Failed to read vrefh regulator: %d\n",
|
||||
ret);
|
||||
goto error_disable_vrefh_reg;
|
||||
}
|
||||
state->vrefh_mv = ret / 1000;
|
||||
|
||||
if (id->driver_data == ID_AD8803) {
|
||||
state->vrefl_reg = devm_regulator_get(&spi->dev, "vrefl");
|
||||
if (IS_ERR(state->vrefl_reg)) {
|
||||
dev_err(&spi->dev, "Vrefl regulator not specified\n");
|
||||
ret = PTR_ERR(state->vrefl_reg);
|
||||
goto error_disable_vrefh_reg;
|
||||
}
|
||||
|
||||
ret = regulator_enable(state->vrefl_reg);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "Failed to enable vrefl regulator: %d\n",
|
||||
ret);
|
||||
goto error_disable_vrefh_reg;
|
||||
}
|
||||
|
||||
ret = regulator_get_voltage(state->vrefl_reg);
|
||||
if (ret < 0) {
|
||||
dev_err(&spi->dev, "Failed to read vrefl regulator: %d\n",
|
||||
ret);
|
||||
goto error_disable_vrefl_reg;
|
||||
}
|
||||
state->vrefl_mv = ret / 1000;
|
||||
} else {
|
||||
state->vrefl_mv = 0;
|
||||
state->vrefl_reg = NULL;
|
||||
}
|
||||
|
||||
spi_set_drvdata(spi, indio_dev);
|
||||
indio_dev->dev.parent = &spi->dev;
|
||||
indio_dev->info = &ad8801_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->channels = ad8801_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(ad8801_channels);
|
||||
indio_dev->name = id->name;
|
||||
|
||||
ret = iio_device_register(indio_dev);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "Failed to register iio device: %d\n",
|
||||
ret);
|
||||
goto error_disable_vrefl_reg;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
error_disable_vrefl_reg:
|
||||
if (state->vrefl_reg)
|
||||
regulator_disable(state->vrefl_reg);
|
||||
error_disable_vrefh_reg:
|
||||
regulator_disable(state->vrefh_reg);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad8801_remove(struct spi_device *spi)
|
||||
{
|
||||
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
||||
struct ad8801_state *state = iio_priv(indio_dev);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
if (state->vrefl_reg)
|
||||
regulator_disable(state->vrefl_reg);
|
||||
regulator_disable(state->vrefh_reg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct spi_device_id ad8801_ids[] = {
|
||||
{"ad8801", ID_AD8801},
|
||||
{"ad8803", ID_AD8803},
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, ad8801_ids);
|
||||
|
||||
static struct spi_driver ad8801_driver = {
|
||||
.driver = {
|
||||
.name = "ad8801",
|
||||
},
|
||||
.probe = ad8801_probe,
|
||||
.remove = ad8801_remove,
|
||||
.id_table = ad8801_ids,
|
||||
};
|
||||
module_spi_driver(ad8801_driver);
|
||||
|
||||
MODULE_AUTHOR("Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>");
|
||||
MODULE_DESCRIPTION("Analog Devices AD8801/AD8803 DAC");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user