M7350/kernel/drivers/iio/dac/ad5624r_spi.c

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/*
* AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
*
* Copyright 2010-2011 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
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#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
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#include "ad5624r.h"
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static int ad5624r_spi_write(struct spi_device *spi,
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u8 cmd, u8 addr, u16 val, u8 shift)
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{
u32 data;
u8 msg[3];
/*
* The input shift register is 24 bits wide. The first two bits are
* don't care bits. The next three are the command bits, C2 to C0,
* followed by the 3-bit DAC address, A2 to A0, and then the
* 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
* 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
* for the AD5664R, AD5644R, and AD5624R, respectively.
*/
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data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << shift);
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msg[0] = data >> 16;
msg[1] = data >> 8;
msg[2] = data;
return spi_write(spi, msg, 3);
}
static int ad5624r_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct ad5624r_state *st = iio_priv(indio_dev);
switch (m) {
case IIO_CHAN_INFO_SCALE:
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*val = st->vref_mv;
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
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}
return -EINVAL;
}
static int ad5624r_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct ad5624r_state *st = iio_priv(indio_dev);
switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (val >= (1 << chan->scan_type.realbits) || val < 0)
return -EINVAL;
return ad5624r_spi_write(st->us,
AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
chan->address, val,
chan->scan_type.shift);
default:
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return -EINVAL;
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}
}
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static const char * const ad5624r_powerdown_modes[] = {
"1kohm_to_gnd",
"100kohm_to_gnd",
"three_state"
};
static int ad5624r_get_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
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{
struct ad5624r_state *st = iio_priv(indio_dev);
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return st->pwr_down_mode;
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}
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static int ad5624r_set_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, unsigned int mode)
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{
struct ad5624r_state *st = iio_priv(indio_dev);
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st->pwr_down_mode = mode;
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return 0;
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}
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static const struct iio_enum ad5624r_powerdown_mode_enum = {
.items = ad5624r_powerdown_modes,
.num_items = ARRAY_SIZE(ad5624r_powerdown_modes),
.get = ad5624r_get_powerdown_mode,
.set = ad5624r_set_powerdown_mode,
};
static ssize_t ad5624r_read_dac_powerdown(struct iio_dev *indio_dev,
uintptr_t private, const struct iio_chan_spec *chan, char *buf)
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{
struct ad5624r_state *st = iio_priv(indio_dev);
return sprintf(buf, "%d\n",
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!!(st->pwr_down_mask & (1 << chan->channel)));
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}
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static ssize_t ad5624r_write_dac_powerdown(struct iio_dev *indio_dev,
uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
size_t len)
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{
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bool pwr_down;
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int ret;
struct ad5624r_state *st = iio_priv(indio_dev);
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ret = strtobool(buf, &pwr_down);
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if (ret)
return ret;
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if (pwr_down)
st->pwr_down_mask |= (1 << chan->channel);
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else
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st->pwr_down_mask &= ~(1 << chan->channel);
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ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
(st->pwr_down_mode << 4) |
st->pwr_down_mask, 16);
return ret ? ret : len;
}
static const struct iio_info ad5624r_info = {
.write_raw = ad5624r_write_raw,
.read_raw = ad5624r_read_raw,
.driver_module = THIS_MODULE,
};
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static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = {
{
.name = "powerdown",
.read = ad5624r_read_dac_powerdown,
.write = ad5624r_write_dac_powerdown,
.shared = IIO_SEPARATE,
},
IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
&ad5624r_powerdown_mode_enum),
IIO_ENUM_AVAILABLE("powerdown_mode", &ad5624r_powerdown_mode_enum),
{ },
};
#define AD5624R_CHANNEL(_chan, _bits) { \
.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), \
.address = (_chan), \
.scan_type = { \
.sign = 'u', \
.realbits = (_bits), \
.storagebits = 16, \
.shift = 16 - (_bits), \
}, \
.ext_info = ad5624r_ext_info, \
}
#define DECLARE_AD5624R_CHANNELS(_name, _bits) \
const struct iio_chan_spec _name##_channels[] = { \
AD5624R_CHANNEL(0, _bits), \
AD5624R_CHANNEL(1, _bits), \
AD5624R_CHANNEL(2, _bits), \
AD5624R_CHANNEL(3, _bits), \
}
static DECLARE_AD5624R_CHANNELS(ad5624r, 12);
static DECLARE_AD5624R_CHANNELS(ad5644r, 14);
static DECLARE_AD5624R_CHANNELS(ad5664r, 16);
static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
[ID_AD5624R3] = {
.channels = ad5624r_channels,
.int_vref_mv = 1250,
},
[ID_AD5624R5] = {
.channels = ad5624r_channels,
.int_vref_mv = 2500,
},
[ID_AD5644R3] = {
.channels = ad5644r_channels,
.int_vref_mv = 1250,
},
[ID_AD5644R5] = {
.channels = ad5644r_channels,
.int_vref_mv = 2500,
},
[ID_AD5664R3] = {
.channels = ad5664r_channels,
.int_vref_mv = 1250,
},
[ID_AD5664R5] = {
.channels = ad5664r_channels,
.int_vref_mv = 2500,
},
};
static int ad5624r_probe(struct spi_device *spi)
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{
struct ad5624r_state *st;
struct iio_dev *indio_dev;
int ret, voltage_uv = 0;
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indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
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st = iio_priv(indio_dev);
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st->reg = devm_regulator_get(&spi->dev, "vcc");
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if (!IS_ERR(st->reg)) {
ret = regulator_enable(st->reg);
if (ret)
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return ret;
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ret = regulator_get_voltage(st->reg);
if (ret < 0)
goto error_disable_reg;
voltage_uv = ret;
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}
spi_set_drvdata(spi, indio_dev);
st->chip_info =
&ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];
if (voltage_uv)
st->vref_mv = voltage_uv / 1000;
else
st->vref_mv = st->chip_info->int_vref_mv;
st->us = spi;
indio_dev->dev.parent = &spi->dev;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad5624r_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = st->chip_info->channels;
indio_dev->num_channels = AD5624R_DAC_CHANNELS;
ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
!!voltage_uv, 16);
if (ret)
goto error_disable_reg;
ret = iio_device_register(indio_dev);
if (ret)
goto error_disable_reg;
return 0;
error_disable_reg:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
return ret;
}
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static int ad5624r_remove(struct spi_device *spi)
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{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ad5624r_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
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if (!IS_ERR(st->reg))
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regulator_disable(st->reg);
return 0;
}
static const struct spi_device_id ad5624r_id[] = {
{"ad5624r3", ID_AD5624R3},
{"ad5644r3", ID_AD5644R3},
{"ad5664r3", ID_AD5664R3},
{"ad5624r5", ID_AD5624R5},
{"ad5644r5", ID_AD5644R5},
{"ad5664r5", ID_AD5664R5},
{}
};
MODULE_DEVICE_TABLE(spi, ad5624r_id);
static struct spi_driver ad5624r_driver = {
.driver = {
.name = "ad5624r",
.owner = THIS_MODULE,
},
.probe = ad5624r_probe,
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.remove = ad5624r_remove,
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.id_table = ad5624r_id,
};
module_spi_driver(ad5624r_driver);
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
MODULE_LICENSE("GPL v2");