staging:iio:dac: Add AD5764 driver
This patch adds support for the Analog Devices AD5764, AD5764R, AD5744, AD5744R quad channel analog-to-digital converter. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Родитель
29bf6263af
Коммит
68b14d7ea9
|
@ -62,6 +62,16 @@ config AD5504
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called ad5504.
|
||||
|
||||
config AD5764
|
||||
tristate "Analog Devices AD5764/64R/44/44R DAC driver"
|
||||
depends on SPI_MASTER
|
||||
help
|
||||
Say yes here to build support for Analog Devices AD5764, AD5764R, AD5744,
|
||||
AD5744R Digital to Analog Converter.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called ad5764.
|
||||
|
||||
config AD5791
|
||||
tristate "Analog Devices AD5760/AD5780/AD5781/AD5791 DAC SPI driver"
|
||||
depends on SPI
|
||||
|
|
|
@ -8,6 +8,7 @@ obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
|
|||
obj-$(CONFIG_AD5064) += ad5064.o
|
||||
obj-$(CONFIG_AD5504) += ad5504.o
|
||||
obj-$(CONFIG_AD5446) += ad5446.o
|
||||
obj-$(CONFIG_AD5764) += ad5764.o
|
||||
obj-$(CONFIG_AD5791) += ad5791.o
|
||||
obj-$(CONFIG_AD5686) += ad5686.o
|
||||
obj-$(CONFIG_MAX517) += max517.o
|
||||
|
|
|
@ -0,0 +1,393 @@
|
|||
/*
|
||||
* Analog devices AD5764, AD5764R, AD5744, AD5744R quad-channel
|
||||
* Digital to Analog Converters driver
|
||||
*
|
||||
* Copyright 2011 Analog Devices Inc.
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/sysfs.h>
|
||||
#include <linux/regulator/consumer.h>
|
||||
|
||||
#include "../iio.h"
|
||||
#include "../sysfs.h"
|
||||
#include "dac.h"
|
||||
|
||||
#define AD5764_REG_SF_NOP 0x0
|
||||
#define AD5764_REG_SF_CONFIG 0x1
|
||||
#define AD5764_REG_SF_CLEAR 0x4
|
||||
#define AD5764_REG_SF_LOAD 0x5
|
||||
#define AD5764_REG_DATA(x) ((2 << 3) | (x))
|
||||
#define AD5764_REG_COARSE_GAIN(x) ((3 << 3) | (x))
|
||||
#define AD5764_REG_FINE_GAIN(x) ((4 << 3) | (x))
|
||||
#define AD5764_REG_OFFSET(x) ((5 << 3) | (x))
|
||||
|
||||
#define AD5764_NUM_CHANNELS 4
|
||||
|
||||
/**
|
||||
* struct ad5764_chip_info - chip specific information
|
||||
* @int_vref: Value of the internal reference voltage in uV - 0 if external
|
||||
* reference voltage is used
|
||||
* @channel channel specification
|
||||
*/
|
||||
|
||||
struct ad5764_chip_info {
|
||||
unsigned long int_vref;
|
||||
const struct iio_chan_spec *channels;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ad5764_state - driver instance specific data
|
||||
* @spi: spi_device
|
||||
* @chip_info: chip info
|
||||
* @vref_reg: vref supply regulators
|
||||
* @data: spi transfer buffers
|
||||
*/
|
||||
|
||||
struct ad5764_state {
|
||||
struct spi_device *spi;
|
||||
const struct ad5764_chip_info *chip_info;
|
||||
struct regulator_bulk_data vref_reg[2];
|
||||
|
||||
/*
|
||||
* DMA (thus cache coherency maintenance) requires the
|
||||
* transfer buffers to live in their own cache lines.
|
||||
*/
|
||||
union {
|
||||
__be32 d32;
|
||||
u8 d8[4];
|
||||
} data[2] ____cacheline_aligned;
|
||||
};
|
||||
|
||||
enum ad5764_type {
|
||||
ID_AD5744,
|
||||
ID_AD5744R,
|
||||
ID_AD5764,
|
||||
ID_AD5764R,
|
||||
};
|
||||
|
||||
#define AD5764_CHANNEL(_chan, _bits) { \
|
||||
.type = IIO_VOLTAGE, \
|
||||
.indexed = 1, \
|
||||
.output = 1, \
|
||||
.channel = (_chan), \
|
||||
.address = (_chan), \
|
||||
.info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT | \
|
||||
IIO_CHAN_INFO_SCALE_SEPARATE_BIT | \
|
||||
IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT | \
|
||||
IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT, \
|
||||
.scan_type = IIO_ST('u', (_bits), 16, 16 - (_bits)) \
|
||||
}
|
||||
|
||||
#define DECLARE_AD5764_CHANNELS(_name, _bits) \
|
||||
const struct iio_chan_spec _name##_channels[] = { \
|
||||
AD5764_CHANNEL(0, (_bits)), \
|
||||
AD5764_CHANNEL(1, (_bits)), \
|
||||
AD5764_CHANNEL(2, (_bits)), \
|
||||
AD5764_CHANNEL(3, (_bits)), \
|
||||
};
|
||||
|
||||
static DECLARE_AD5764_CHANNELS(ad5764, 16);
|
||||
static DECLARE_AD5764_CHANNELS(ad5744, 14);
|
||||
|
||||
static const struct ad5764_chip_info ad5764_chip_infos[] = {
|
||||
[ID_AD5744] = {
|
||||
.int_vref = 0,
|
||||
.channels = ad5744_channels,
|
||||
},
|
||||
[ID_AD5744R] = {
|
||||
.int_vref = 5000000,
|
||||
.channels = ad5744_channels,
|
||||
},
|
||||
[ID_AD5764] = {
|
||||
.int_vref = 0,
|
||||
.channels = ad5764_channels,
|
||||
},
|
||||
[ID_AD5764R] = {
|
||||
.int_vref = 5000000,
|
||||
.channels = ad5764_channels,
|
||||
},
|
||||
};
|
||||
|
||||
static int ad5764_write(struct iio_dev *indio_dev, unsigned int reg,
|
||||
unsigned int val)
|
||||
{
|
||||
struct ad5764_state *st = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
mutex_lock(&indio_dev->mlock);
|
||||
st->data[0].d32 = cpu_to_be32((reg << 16) | val);
|
||||
|
||||
ret = spi_write(st->spi, &st->data[0].d8[1], 3);
|
||||
mutex_unlock(&indio_dev->mlock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad5764_read(struct iio_dev *indio_dev, unsigned int reg,
|
||||
unsigned int *val)
|
||||
{
|
||||
struct ad5764_state *st = iio_priv(indio_dev);
|
||||
struct spi_message m;
|
||||
int ret;
|
||||
struct spi_transfer t[] = {
|
||||
{
|
||||
.tx_buf = &st->data[0].d8[1],
|
||||
.len = 3,
|
||||
.cs_change = 1,
|
||||
}, {
|
||||
.rx_buf = &st->data[1].d8[1],
|
||||
.len = 3,
|
||||
},
|
||||
};
|
||||
|
||||
spi_message_init(&m);
|
||||
spi_message_add_tail(&t[0], &m);
|
||||
spi_message_add_tail(&t[1], &m);
|
||||
|
||||
mutex_lock(&indio_dev->mlock);
|
||||
|
||||
st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16));
|
||||
|
||||
ret = spi_sync(st->spi, &m);
|
||||
if (ret >= 0)
|
||||
*val = be32_to_cpu(st->data[1].d32) & 0xffff;
|
||||
|
||||
mutex_unlock(&indio_dev->mlock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad5764_chan_info_to_reg(struct iio_chan_spec const *chan, long info)
|
||||
{
|
||||
switch (info) {
|
||||
case 0:
|
||||
return AD5764_REG_DATA(chan->address);
|
||||
case IIO_CHAN_INFO_CALIBBIAS:
|
||||
return AD5764_REG_OFFSET(chan->address);
|
||||
case IIO_CHAN_INFO_CALIBSCALE:
|
||||
return AD5764_REG_FINE_GAIN(chan->address);
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ad5764_write_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan, int val, int val2, long info)
|
||||
{
|
||||
const int max_val = (1 << chan->scan_type.realbits);
|
||||
unsigned int reg;
|
||||
|
||||
switch (info) {
|
||||
case 0:
|
||||
if (val >= max_val || val < 0)
|
||||
return -EINVAL;
|
||||
val <<= chan->scan_type.shift;
|
||||
break;
|
||||
case IIO_CHAN_INFO_CALIBBIAS:
|
||||
if (val >= 128 || val < -128)
|
||||
return -EINVAL;
|
||||
break;
|
||||
case IIO_CHAN_INFO_CALIBSCALE:
|
||||
if (val >= 32 || val < -32)
|
||||
return -EINVAL;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
reg = ad5764_chan_info_to_reg(chan, info);
|
||||
return ad5764_write(indio_dev, reg, (u16)val);
|
||||
}
|
||||
|
||||
static int ad5764_get_channel_vref(struct ad5764_state *st,
|
||||
unsigned int channel)
|
||||
{
|
||||
if (st->chip_info->int_vref)
|
||||
return st->chip_info->int_vref;
|
||||
else
|
||||
return regulator_get_voltage(st->vref_reg[channel / 2].consumer);
|
||||
}
|
||||
|
||||
static int ad5764_read_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan, int *val, int *val2, long info)
|
||||
{
|
||||
struct ad5764_state *st = iio_priv(indio_dev);
|
||||
unsigned long scale_uv;
|
||||
unsigned int reg;
|
||||
int vref;
|
||||
int ret;
|
||||
|
||||
switch (info) {
|
||||
case 0:
|
||||
reg = AD5764_REG_DATA(chan->address);
|
||||
ret = ad5764_read(indio_dev, reg, val);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
*val >>= chan->scan_type.shift;
|
||||
return IIO_VAL_INT;
|
||||
case IIO_CHAN_INFO_CALIBBIAS:
|
||||
reg = AD5764_REG_OFFSET(chan->address);
|
||||
ret = ad5764_read(indio_dev, reg, val);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
*val = sign_extend32(*val, 7);
|
||||
return IIO_VAL_INT;
|
||||
case IIO_CHAN_INFO_CALIBSCALE:
|
||||
reg = AD5764_REG_FINE_GAIN(chan->address);
|
||||
ret = ad5764_read(indio_dev, reg, val);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
*val = sign_extend32(*val, 5);
|
||||
return IIO_VAL_INT;
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
/* vout = 4 * vref + ((dac_code / 65535) - 0.5) */
|
||||
vref = ad5764_get_channel_vref(st, chan->channel);
|
||||
if (vref < 0)
|
||||
return vref;
|
||||
|
||||
scale_uv = (vref * 4 * 100) >> chan->scan_type.realbits;
|
||||
*val = scale_uv / 100000;
|
||||
*val2 = (scale_uv % 100000) * 10;
|
||||
return IIO_VAL_INT_PLUS_MICRO;
|
||||
case IIO_CHAN_INFO_OFFSET:
|
||||
*val = -(1 << chan->scan_type.realbits) / 2;
|
||||
return IIO_VAL_INT;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static const struct iio_info ad5764_info = {
|
||||
.read_raw = ad5764_read_raw,
|
||||
.write_raw = ad5764_write_raw,
|
||||
.driver_module = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int __devinit ad5764_probe(struct spi_device *spi)
|
||||
{
|
||||
enum ad5764_type type = spi_get_device_id(spi)->driver_data;
|
||||
struct iio_dev *indio_dev;
|
||||
struct ad5764_state *st;
|
||||
int ret;
|
||||
|
||||
indio_dev = iio_allocate_device(sizeof(*st));
|
||||
if (indio_dev == NULL) {
|
||||
dev_err(&spi->dev, "Failed to allocate iio device\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
st = iio_priv(indio_dev);
|
||||
spi_set_drvdata(spi, indio_dev);
|
||||
|
||||
st->spi = spi;
|
||||
st->chip_info = &ad5764_chip_infos[type];
|
||||
|
||||
indio_dev->dev.parent = &spi->dev;
|
||||
indio_dev->name = spi_get_device_id(spi)->name;
|
||||
indio_dev->info = &ad5764_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->num_channels = AD5764_NUM_CHANNELS;
|
||||
indio_dev->channels = st->chip_info->channels;
|
||||
|
||||
if (st->chip_info->int_vref == 0) {
|
||||
st->vref_reg[0].supply = "vrefAB";
|
||||
st->vref_reg[1].supply = "vrefCD";
|
||||
|
||||
ret = regulator_bulk_get(&st->spi->dev,
|
||||
ARRAY_SIZE(st->vref_reg), st->vref_reg);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "Failed to request vref regulators: %d\n",
|
||||
ret);
|
||||
goto error_free;
|
||||
}
|
||||
|
||||
ret = regulator_bulk_enable(ARRAY_SIZE(st->vref_reg),
|
||||
st->vref_reg);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "Failed to enable vref regulators: %d\n",
|
||||
ret);
|
||||
goto error_free_reg;
|
||||
}
|
||||
}
|
||||
|
||||
ret = iio_device_register(indio_dev);
|
||||
if (ret) {
|
||||
dev_err(&spi->dev, "Failed to register iio device: %d\n", ret);
|
||||
goto error_disable_reg;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
error_disable_reg:
|
||||
if (st->chip_info->int_vref == 0)
|
||||
regulator_bulk_disable(ARRAY_SIZE(st->vref_reg), st->vref_reg);
|
||||
error_free_reg:
|
||||
if (st->chip_info->int_vref == 0)
|
||||
regulator_bulk_free(ARRAY_SIZE(st->vref_reg), st->vref_reg);
|
||||
error_free:
|
||||
iio_free_device(indio_dev);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit ad5764_remove(struct spi_device *spi)
|
||||
{
|
||||
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
||||
struct ad5764_state *st = iio_priv(indio_dev);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
|
||||
if (st->chip_info->int_vref == 0) {
|
||||
regulator_bulk_disable(ARRAY_SIZE(st->vref_reg), st->vref_reg);
|
||||
regulator_bulk_free(ARRAY_SIZE(st->vref_reg), st->vref_reg);
|
||||
}
|
||||
|
||||
iio_free_device(indio_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct spi_device_id ad5764_ids[] = {
|
||||
{ "ad5744", ID_AD5744 },
|
||||
{ "ad5744r", ID_AD5744R },
|
||||
{ "ad5764", ID_AD5764 },
|
||||
{ "ad5764r", ID_AD5764R },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, ad5764_ids);
|
||||
|
||||
static struct spi_driver ad5764_driver = {
|
||||
.driver = {
|
||||
.name = "ad5764",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = ad5764_probe,
|
||||
.remove = __devexit_p(ad5764_remove),
|
||||
.id_table = ad5764_ids,
|
||||
};
|
||||
|
||||
static int __init ad5764_spi_init(void)
|
||||
{
|
||||
return spi_register_driver(&ad5764_driver);
|
||||
}
|
||||
module_init(ad5764_spi_init);
|
||||
|
||||
static void __exit ad5764_spi_exit(void)
|
||||
{
|
||||
spi_unregister_driver(&ad5764_driver);
|
||||
}
|
||||
module_exit(ad5764_spi_exit);
|
||||
|
||||
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
||||
MODULE_DESCRIPTION("Analog Devices AD5744/AD5744R/AD5764/AD5764R DAC");
|
||||
MODULE_LICENSE("GPL v2");
|
Загрузка…
Ссылка в новой задаче