2012-10-16 23:29:00 +07:00
|
|
|
/*
|
|
|
|
* AD5415, AD5426, AD5429, AD5432, AD5439, AD5443, AD5449 Digital to Analog
|
|
|
|
* Converter driver.
|
|
|
|
*
|
|
|
|
* Copyright 2012 Analog Devices Inc.
|
|
|
|
* Author: Lars-Peter Clausen <lars@metafoo.de>
|
|
|
|
*
|
|
|
|
* 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 <asm/unaligned.h>
|
|
|
|
|
|
|
|
#include <linux/iio/iio.h>
|
|
|
|
#include <linux/iio/sysfs.h>
|
|
|
|
|
|
|
|
#include <linux/platform_data/ad5449.h>
|
|
|
|
|
|
|
|
#define AD5449_MAX_CHANNELS 2
|
|
|
|
#define AD5449_MAX_VREFS 2
|
|
|
|
|
|
|
|
#define AD5449_CMD_NOOP 0x0
|
|
|
|
#define AD5449_CMD_LOAD_AND_UPDATE(x) (0x1 + (x) * 3)
|
|
|
|
#define AD5449_CMD_READ(x) (0x2 + (x) * 3)
|
|
|
|
#define AD5449_CMD_LOAD(x) (0x3 + (x) * 3)
|
|
|
|
#define AD5449_CMD_CTRL 13
|
|
|
|
|
|
|
|
#define AD5449_CTRL_SDO_OFFSET 10
|
|
|
|
#define AD5449_CTRL_DAISY_CHAIN BIT(9)
|
|
|
|
#define AD5449_CTRL_HCLR_TO_MIDSCALE BIT(8)
|
|
|
|
#define AD5449_CTRL_SAMPLE_RISING BIT(7)
|
|
|
|
|
|
|
|
/**
|
|
|
|
* struct ad5449_chip_info - chip specific information
|
|
|
|
* @channels: Channel specification
|
|
|
|
* @num_channels: Number of channels
|
|
|
|
* @has_ctrl: Chip has a control register
|
|
|
|
*/
|
|
|
|
struct ad5449_chip_info {
|
|
|
|
const struct iio_chan_spec *channels;
|
|
|
|
unsigned int num_channels;
|
|
|
|
bool has_ctrl;
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* struct ad5449 - driver instance specific data
|
|
|
|
* @spi: the SPI device for this driver instance
|
|
|
|
* @chip_info: chip model specific constants, available modes etc
|
|
|
|
* @vref_reg: vref supply regulators
|
|
|
|
* @has_sdo: whether the SDO line is connected
|
|
|
|
* @dac_cache: Cache for the DAC values
|
|
|
|
* @data: spi transfer buffers
|
|
|
|
*/
|
|
|
|
struct ad5449 {
|
|
|
|
struct spi_device *spi;
|
|
|
|
const struct ad5449_chip_info *chip_info;
|
|
|
|
struct regulator_bulk_data vref_reg[AD5449_MAX_VREFS];
|
|
|
|
|
|
|
|
bool has_sdo;
|
|
|
|
uint16_t dac_cache[AD5449_MAX_CHANNELS];
|
|
|
|
|
|
|
|
/*
|
|
|
|
* DMA (thus cache coherency maintenance) requires the
|
|
|
|
* transfer buffers to live in their own cache lines.
|
|
|
|
*/
|
|
|
|
__be16 data[2] ____cacheline_aligned;
|
|
|
|
};
|
|
|
|
|
|
|
|
enum ad5449_type {
|
|
|
|
ID_AD5426,
|
|
|
|
ID_AD5429,
|
|
|
|
ID_AD5432,
|
|
|
|
ID_AD5439,
|
|
|
|
ID_AD5443,
|
|
|
|
ID_AD5449,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int ad5449_write(struct iio_dev *indio_dev, unsigned int addr,
|
|
|
|
unsigned int val)
|
|
|
|
{
|
|
|
|
struct ad5449 *st = iio_priv(indio_dev);
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
mutex_lock(&indio_dev->mlock);
|
|
|
|
st->data[0] = cpu_to_be16((addr << 12) | val);
|
|
|
|
ret = spi_write(st->spi, st->data, 2);
|
|
|
|
mutex_unlock(&indio_dev->mlock);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ad5449_read(struct iio_dev *indio_dev, unsigned int addr,
|
|
|
|
unsigned int *val)
|
|
|
|
{
|
|
|
|
struct ad5449 *st = iio_priv(indio_dev);
|
|
|
|
int ret;
|
|
|
|
struct spi_transfer t[] = {
|
|
|
|
{
|
|
|
|
.tx_buf = &st->data[0],
|
|
|
|
.len = 2,
|
|
|
|
.cs_change = 1,
|
|
|
|
}, {
|
|
|
|
.tx_buf = &st->data[1],
|
|
|
|
.rx_buf = &st->data[1],
|
|
|
|
.len = 2,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
mutex_lock(&indio_dev->mlock);
|
|
|
|
st->data[0] = cpu_to_be16(addr << 12);
|
|
|
|
st->data[1] = cpu_to_be16(AD5449_CMD_NOOP);
|
|
|
|
|
2013-10-05 14:45:00 +07:00
|
|
|
ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));
|
2012-10-16 23:29:00 +07:00
|
|
|
if (ret < 0)
|
2012-10-24 14:13:00 +07:00
|
|
|
goto out_unlock;
|
2012-10-16 23:29:00 +07:00
|
|
|
|
|
|
|
*val = be16_to_cpu(st->data[1]);
|
|
|
|
|
2012-10-24 14:13:00 +07:00
|
|
|
out_unlock:
|
|
|
|
mutex_unlock(&indio_dev->mlock);
|
|
|
|
return ret;
|
2012-10-16 23:29:00 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
static int ad5449_read_raw(struct iio_dev *indio_dev,
|
|
|
|
struct iio_chan_spec const *chan, int *val, int *val2, long info)
|
|
|
|
{
|
|
|
|
struct ad5449 *st = iio_priv(indio_dev);
|
|
|
|
struct regulator_bulk_data *reg;
|
|
|
|
int scale_uv;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
switch (info) {
|
|
|
|
case IIO_CHAN_INFO_RAW:
|
|
|
|
if (st->has_sdo) {
|
|
|
|
ret = ad5449_read(indio_dev,
|
|
|
|
AD5449_CMD_READ(chan->address), val);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
*val &= 0xfff;
|
|
|
|
} else {
|
|
|
|
*val = st->dac_cache[chan->address];
|
|
|
|
}
|
|
|
|
|
|
|
|
return IIO_VAL_INT;
|
|
|
|
case IIO_CHAN_INFO_SCALE:
|
|
|
|
reg = &st->vref_reg[chan->channel];
|
|
|
|
scale_uv = regulator_get_voltage(reg->consumer);
|
|
|
|
if (scale_uv < 0)
|
|
|
|
return scale_uv;
|
|
|
|
|
|
|
|
*val = scale_uv / 1000;
|
|
|
|
*val2 = chan->scan_type.realbits;
|
|
|
|
|
|
|
|
return IIO_VAL_FRACTIONAL_LOG2;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ad5449_write_raw(struct iio_dev *indio_dev,
|
|
|
|
struct iio_chan_spec const *chan, int val, int val2, long info)
|
|
|
|
{
|
|
|
|
struct ad5449 *st = iio_priv(indio_dev);
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
switch (info) {
|
|
|
|
case IIO_CHAN_INFO_RAW:
|
|
|
|
if (val < 0 || val >= (1 << chan->scan_type.realbits))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
ret = ad5449_write(indio_dev,
|
|
|
|
AD5449_CMD_LOAD_AND_UPDATE(chan->address),
|
|
|
|
val << chan->scan_type.shift);
|
|
|
|
if (ret == 0)
|
|
|
|
st->dac_cache[chan->address] = val;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ret = -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct iio_info ad5449_info = {
|
|
|
|
.read_raw = ad5449_read_raw,
|
|
|
|
.write_raw = ad5449_write_raw,
|
|
|
|
.driver_module = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
|
|
|
#define AD5449_CHANNEL(chan, bits) { \
|
|
|
|
.type = IIO_VOLTAGE, \
|
|
|
|
.indexed = 1, \
|
|
|
|
.output = 1, \
|
|
|
|
.channel = (chan), \
|
2013-02-28 02:10:50 +07:00
|
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
|
|
|
|
BIT(IIO_CHAN_INFO_SCALE), \
|
2012-10-16 23:29:00 +07:00
|
|
|
.address = (chan), \
|
2013-12-12 01:45:00 +07:00
|
|
|
.scan_type = { \
|
|
|
|
.sign = 'u', \
|
|
|
|
.realbits = (bits), \
|
|
|
|
.storagebits = 16, \
|
|
|
|
.shift = 12 - (bits), \
|
|
|
|
}, \
|
2012-10-16 23:29:00 +07:00
|
|
|
}
|
|
|
|
|
|
|
|
#define DECLARE_AD5449_CHANNELS(name, bits) \
|
|
|
|
const struct iio_chan_spec name[] = { \
|
|
|
|
AD5449_CHANNEL(0, bits), \
|
|
|
|
AD5449_CHANNEL(1, bits), \
|
|
|
|
}
|
|
|
|
|
|
|
|
static DECLARE_AD5449_CHANNELS(ad5429_channels, 8);
|
|
|
|
static DECLARE_AD5449_CHANNELS(ad5439_channels, 10);
|
|
|
|
static DECLARE_AD5449_CHANNELS(ad5449_channels, 12);
|
|
|
|
|
|
|
|
static const struct ad5449_chip_info ad5449_chip_info[] = {
|
|
|
|
[ID_AD5426] = {
|
|
|
|
.channels = ad5429_channels,
|
|
|
|
.num_channels = 1,
|
|
|
|
.has_ctrl = false,
|
|
|
|
},
|
|
|
|
[ID_AD5429] = {
|
|
|
|
.channels = ad5429_channels,
|
|
|
|
.num_channels = 2,
|
|
|
|
.has_ctrl = true,
|
|
|
|
},
|
|
|
|
[ID_AD5432] = {
|
|
|
|
.channels = ad5439_channels,
|
|
|
|
.num_channels = 1,
|
|
|
|
.has_ctrl = false,
|
|
|
|
},
|
|
|
|
[ID_AD5439] = {
|
|
|
|
.channels = ad5439_channels,
|
|
|
|
.num_channels = 2,
|
|
|
|
.has_ctrl = true,
|
|
|
|
},
|
|
|
|
[ID_AD5443] = {
|
|
|
|
.channels = ad5449_channels,
|
|
|
|
.num_channels = 1,
|
|
|
|
.has_ctrl = false,
|
|
|
|
},
|
|
|
|
[ID_AD5449] = {
|
|
|
|
.channels = ad5449_channels,
|
|
|
|
.num_channels = 2,
|
|
|
|
.has_ctrl = true,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static const char *ad5449_vref_name(struct ad5449 *st, int n)
|
|
|
|
{
|
|
|
|
if (st->chip_info->num_channels == 1)
|
|
|
|
return "VREF";
|
|
|
|
|
|
|
|
if (n == 0)
|
|
|
|
return "VREFA";
|
|
|
|
else
|
|
|
|
return "VREFB";
|
|
|
|
}
|
|
|
|
|
2012-12-22 04:21:43 +07:00
|
|
|
static int ad5449_spi_probe(struct spi_device *spi)
|
2012-10-16 23:29:00 +07:00
|
|
|
{
|
|
|
|
struct ad5449_platform_data *pdata = spi->dev.platform_data;
|
|
|
|
const struct spi_device_id *id = spi_get_device_id(spi);
|
|
|
|
struct iio_dev *indio_dev;
|
|
|
|
struct ad5449 *st;
|
|
|
|
unsigned int i;
|
|
|
|
int ret;
|
|
|
|
|
2013-08-19 18:38:00 +07:00
|
|
|
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
|
2012-10-16 23:29:00 +07:00
|
|
|
if (indio_dev == NULL)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
st = iio_priv(indio_dev);
|
|
|
|
spi_set_drvdata(spi, indio_dev);
|
|
|
|
|
|
|
|
st->chip_info = &ad5449_chip_info[id->driver_data];
|
|
|
|
st->spi = spi;
|
|
|
|
|
|
|
|
for (i = 0; i < st->chip_info->num_channels; ++i)
|
|
|
|
st->vref_reg[i].supply = ad5449_vref_name(st, i);
|
|
|
|
|
2013-08-19 18:38:00 +07:00
|
|
|
ret = devm_regulator_bulk_get(&spi->dev, st->chip_info->num_channels,
|
2012-10-16 23:29:00 +07:00
|
|
|
st->vref_reg);
|
|
|
|
if (ret)
|
2013-08-19 18:38:00 +07:00
|
|
|
return ret;
|
2012-10-16 23:29:00 +07:00
|
|
|
|
|
|
|
ret = regulator_bulk_enable(st->chip_info->num_channels, st->vref_reg);
|
|
|
|
if (ret)
|
2013-08-19 18:38:00 +07:00
|
|
|
return ret;
|
2012-10-16 23:29:00 +07:00
|
|
|
|
|
|
|
indio_dev->dev.parent = &spi->dev;
|
|
|
|
indio_dev->name = id->name;
|
|
|
|
indio_dev->info = &ad5449_info;
|
|
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
indio_dev->channels = st->chip_info->channels;
|
|
|
|
indio_dev->num_channels = st->chip_info->num_channels;
|
|
|
|
|
|
|
|
if (st->chip_info->has_ctrl) {
|
|
|
|
unsigned int ctrl = 0x00;
|
|
|
|
if (pdata) {
|
|
|
|
if (pdata->hardware_clear_to_midscale)
|
|
|
|
ctrl |= AD5449_CTRL_HCLR_TO_MIDSCALE;
|
|
|
|
ctrl |= pdata->sdo_mode << AD5449_CTRL_SDO_OFFSET;
|
|
|
|
st->has_sdo = pdata->sdo_mode != AD5449_SDO_DISABLED;
|
|
|
|
} else {
|
|
|
|
st->has_sdo = true;
|
|
|
|
}
|
|
|
|
ad5449_write(indio_dev, AD5449_CMD_CTRL, ctrl);
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
|
|
if (ret)
|
|
|
|
goto error_disable_reg;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_disable_reg:
|
|
|
|
regulator_bulk_disable(st->chip_info->num_channels, st->vref_reg);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2012-12-22 04:21:43 +07:00
|
|
|
static int ad5449_spi_remove(struct spi_device *spi)
|
2012-10-16 23:29:00 +07:00
|
|
|
{
|
|
|
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
|
|
|
struct ad5449 *st = iio_priv(indio_dev);
|
|
|
|
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
|
|
|
|
regulator_bulk_disable(st->chip_info->num_channels, st->vref_reg);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct spi_device_id ad5449_spi_ids[] = {
|
|
|
|
{ "ad5415", ID_AD5449 },
|
|
|
|
{ "ad5426", ID_AD5426 },
|
|
|
|
{ "ad5429", ID_AD5429 },
|
|
|
|
{ "ad5432", ID_AD5432 },
|
|
|
|
{ "ad5439", ID_AD5439 },
|
|
|
|
{ "ad5443", ID_AD5443 },
|
|
|
|
{ "ad5449", ID_AD5449 },
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(spi, ad5449_spi_ids);
|
|
|
|
|
|
|
|
static struct spi_driver ad5449_spi_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "ad5449",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
|
|
|
.probe = ad5449_spi_probe,
|
2012-12-22 04:21:43 +07:00
|
|
|
.remove = ad5449_spi_remove,
|
2012-10-16 23:29:00 +07:00
|
|
|
.id_table = ad5449_spi_ids,
|
|
|
|
};
|
|
|
|
module_spi_driver(ad5449_spi_driver);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
|
|
|
MODULE_DESCRIPTION("Analog Devices AD5449 and similar DACs");
|
|
|
|
MODULE_LICENSE("GPL v2");
|