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linux/drivers/iio/dac/ad5446.c
Lars-Peter Clausen 779c0c4619 iio:dac:ad5446: Add support for the AD5450/51/52/53 
This patch adds support for the Analog Devices AD5450/51/52/53 Digital-to-Analog
converters.

The AD5452 and AD5453 are software compatible to the existing AD5444 and AD5446.
The AD5450 and AD5451 are similar but have a smaller resolution.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-06-26 14:57:30 -07:00

394 lines
9.2 KiB
C
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/*
* AD5446 SPI DAC driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include "ad5446.h"
static int ad5446_write(struct ad5446_state *st, unsigned val)
{
__be16 data = cpu_to_be16(val);
return spi_write(st->spi, &data, sizeof(data));
}
static int ad5660_write(struct ad5446_state *st, unsigned val)
{
uint8_t data[3];
data[0] = (val >> 16) & 0xFF;
data[1] = (val >> 8) & 0xFF;
data[2] = val & 0xFF;
return spi_write(st->spi, data, sizeof(data));
}
static const char * const ad5446_powerdown_modes[] = {
"1kohm_to_gnd", "100kohm_to_gnd", "three_state"
};
static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, unsigned int mode)
{
struct ad5446_state *st = iio_priv(indio_dev);
st->pwr_down_mode = mode + 1;
return 0;
}
static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct ad5446_state *st = iio_priv(indio_dev);
return st->pwr_down_mode - 1;
}
static const struct iio_enum ad5446_powerdown_mode_enum = {
.items = ad5446_powerdown_modes,
.num_items = ARRAY_SIZE(ad5446_powerdown_modes),
.get = ad5446_get_powerdown_mode,
.set = ad5446_set_powerdown_mode,
};
static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev,
uintptr_t private,
const struct iio_chan_spec *chan,
char *buf)
{
struct ad5446_state *st = iio_priv(indio_dev);
return sprintf(buf, "%d\n", st->pwr_down);
}
static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
uintptr_t private,
const struct iio_chan_spec *chan,
const char *buf, size_t len)
{
struct ad5446_state *st = iio_priv(indio_dev);
unsigned int shift;
unsigned int val;
bool powerdown;
int ret;
ret = strtobool(buf, &powerdown);
if (ret)
return ret;
mutex_lock(&indio_dev->mlock);
st->pwr_down = powerdown;
if (st->pwr_down) {
shift = chan->scan_type.realbits + chan->scan_type.shift;
val = st->pwr_down_mode << shift;
} else {
val = st->cached_val;
}
ret = st->chip_info->write(st, val);
mutex_unlock(&indio_dev->mlock);
return ret ? ret : len;
}
static const struct iio_chan_spec_ext_info ad5064_ext_info_powerdown[] = {
{
.name = "powerdown",
.read = ad5446_read_dac_powerdown,
.write = ad5446_write_dac_powerdown,
},
IIO_ENUM("powerdown_mode", false, &ad5446_powerdown_mode_enum),
IIO_ENUM_AVAILABLE("powerdown_mode", &ad5446_powerdown_mode_enum),
{ },
};
#define _AD5446_CHANNEL(bits, storage, shift, ext) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.output = 1, \
.channel = 0, \
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
IIO_CHAN_INFO_SCALE_SHARED_BIT, \
.scan_type = IIO_ST('u', (bits), (storage), (shift)), \
.ext_info = (ext), \
}
#define AD5446_CHANNEL(bits, storage, shift) \
_AD5446_CHANNEL(bits, storage, shift, NULL)
#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \
_AD5446_CHANNEL(bits, storage, shift, ad5064_ext_info_powerdown)
static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
[ID_AD5444] = {
.channel = AD5446_CHANNEL(12, 16, 2),
.write = ad5446_write,
},
[ID_AD5446] = {
.channel = AD5446_CHANNEL(14, 16, 0),
.write = ad5446_write,
},
[ID_AD5450] = {
.channel = AD5446_CHANNEL(8, 16, 6),
.write = ad5446_write,
},
[ID_AD5451] = {
.channel = AD5446_CHANNEL(10, 16, 4),
.write = ad5446_write,
},
[ID_AD5541A] = {
.channel = AD5446_CHANNEL(16, 16, 0),
.write = ad5446_write,
},
[ID_AD5512A] = {
.channel = AD5446_CHANNEL(12, 16, 4),
.write = ad5446_write,
},
[ID_AD5553] = {
.channel = AD5446_CHANNEL(14, 16, 0),
.write = ad5446_write,
},
[ID_AD5601] = {
.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6),
.write = ad5446_write,
},
[ID_AD5611] = {
.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4),
.write = ad5446_write,
},
[ID_AD5621] = {
.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
.write = ad5446_write,
},
[ID_AD5620_2500] = {
.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
.int_vref_mv = 2500,
.write = ad5446_write,
},
[ID_AD5620_1250] = {
.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
.int_vref_mv = 1250,
.write = ad5446_write,
},
[ID_AD5640_2500] = {
.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
.int_vref_mv = 2500,
.write = ad5446_write,
},
[ID_AD5640_1250] = {
.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
.int_vref_mv = 1250,
.write = ad5446_write,
},
[ID_AD5660_2500] = {
.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
.int_vref_mv = 2500,
.write = ad5660_write,
},
[ID_AD5660_1250] = {
.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
.int_vref_mv = 1250,
.write = ad5660_write,
},
[ID_AD5662] = {
.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
.write = ad5660_write,
},
};
static int ad5446_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct ad5446_state *st = iio_priv(indio_dev);
unsigned long scale_uv;
switch (m) {
case IIO_CHAN_INFO_RAW:
*val = st->cached_val;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
*val = scale_uv / 1000;
*val2 = (scale_uv % 1000) * 1000;
return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
}
static int ad5446_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct ad5446_state *st = iio_priv(indio_dev);
int ret = 0;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (val >= (1 << chan->scan_type.realbits) || val < 0)
return -EINVAL;
val <<= chan->scan_type.shift;
mutex_lock(&indio_dev->mlock);
st->cached_val = val;
if (!st->pwr_down)
ret = st->chip_info->write(st, val);
mutex_unlock(&indio_dev->mlock);
break;
default:
ret = -EINVAL;
}
return ret;
}
static const struct iio_info ad5446_info = {
.read_raw = ad5446_read_raw,
.write_raw = ad5446_write_raw,
.driver_module = THIS_MODULE,
};
static int __devinit ad5446_probe(struct spi_device *spi)
{
struct ad5446_state *st;
struct iio_dev *indio_dev;
struct regulator *reg;
int ret, voltage_uv = 0;
reg = regulator_get(&spi->dev, "vcc");
if (!IS_ERR(reg)) {
ret = regulator_enable(reg);
if (ret)
goto error_put_reg;
voltage_uv = regulator_get_voltage(reg);
}
indio_dev = iio_device_alloc(sizeof(*st));
if (indio_dev == NULL) {
ret = -ENOMEM;
goto error_disable_reg;
}
st = iio_priv(indio_dev);
st->chip_info =
&ad5446_chip_info_tbl[spi_get_device_id(spi)->driver_data];
spi_set_drvdata(spi, indio_dev);
st->reg = reg;
st->spi = spi;
/* Establish that the iio_dev is a child of the spi device */
indio_dev->dev.parent = &spi->dev;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad5446_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = &st->chip_info->channel;
indio_dev->num_channels = 1;
st->pwr_down_mode = MODE_PWRDWN_1k;
if (st->chip_info->int_vref_mv)
st->vref_mv = st->chip_info->int_vref_mv;
else if (voltage_uv)
st->vref_mv = voltage_uv / 1000;
else
dev_warn(&spi->dev, "reference voltage unspecified\n");
ret = iio_device_register(indio_dev);
if (ret)
goto error_free_device;
return 0;
error_free_device:
iio_device_free(indio_dev);
error_disable_reg:
if (!IS_ERR(reg))
regulator_disable(reg);
error_put_reg:
if (!IS_ERR(reg))
regulator_put(reg);
return ret;
}
static int ad5446_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ad5446_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
if (!IS_ERR(st->reg)) {
regulator_disable(st->reg);
regulator_put(st->reg);
}
iio_device_free(indio_dev);
return 0;
}
static const struct spi_device_id ad5446_id[] = {
{"ad5444", ID_AD5444},
{"ad5446", ID_AD5446},
{"ad5450", ID_AD5450},
{"ad5451", ID_AD5451},
{"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */
{"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */
{"ad5512a", ID_AD5512A},
{"ad5541a", ID_AD5541A},
{"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */
{"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */
{"ad5553", ID_AD5553},
{"ad5601", ID_AD5601},
{"ad5611", ID_AD5611},
{"ad5621", ID_AD5621},
{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
{"ad5640-2500", ID_AD5640_2500},
{"ad5640-1250", ID_AD5640_1250},
{"ad5660-2500", ID_AD5660_2500},
{"ad5660-1250", ID_AD5660_1250},
{"ad5662", ID_AD5662},
{}
};
MODULE_DEVICE_TABLE(spi, ad5446_id);
static struct spi_driver ad5446_driver = {
.driver = {
.name = "ad5446",
.owner = THIS_MODULE,
},
.probe = ad5446_probe,
.remove = __devexit_p(ad5446_remove),
.id_table = ad5446_id,
};
module_spi_driver(ad5446_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
MODULE_LICENSE("GPL v2");
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