iio: add ad5761 DAC driver
ad5761 is a 1-channel DAC with configurable output range. The driver uses the regulator interface for its voltage ref. It shares its register layout with ad5761r, ad5721 and ad5721r. Differences: ad5761* are 16 bit, ad5721* are 12 bits. ad57*1r have an internal reference. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Ricardo Ribalda Delgado
Jonathan Cameron
Родитель
7ca6574a7a
Коммит
131497acd8
1
CREDITS
1
CREDITS
|
|
@ -3035,6 +3035,7 @@ D: PLX USB338x driver
|
|||
D: PCA9634 driver
|
||||
D: Option GTM671WFS
|
||||
D: Fintek F81216A
|
||||
D: AD5761 iio driver
|
||||
D: Various kernel hacks
|
||||
S: Qtechnology A/S
|
||||
S: Valby Langgade 142
|
||||
|
|
|
|||
|
|
@ -111,6 +111,16 @@ config AD5755
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called ad5755.
|
||||
|
||||
config AD5761
|
||||
tristate "Analog Devices AD5761/61R/21/21R DAC driver"
|
||||
depends on SPI_MASTER
|
||||
help
|
||||
Say yes here to build support for Analog Devices AD5761, AD5761R, AD5721,
|
||||
AD5721R Digital to Analog Converter.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called ad5761.
|
||||
|
||||
config AD5764
|
||||
tristate "Analog Devices AD5764/64R/44/44R DAC driver"
|
||||
depends on SPI_MASTER
|
||||
|
|
|
|||
|
|
@ -12,6 +12,7 @@ obj-$(CONFIG_AD5504) += ad5504.o
|
|||
obj-$(CONFIG_AD5446) += ad5446.o
|
||||
obj-$(CONFIG_AD5449) += ad5449.o
|
||||
obj-$(CONFIG_AD5755) += ad5755.o
|
||||
obj-$(CONFIG_AD5761) += ad5761.o
|
||||
obj-$(CONFIG_AD5764) += ad5764.o
|
||||
obj-$(CONFIG_AD5791) += ad5791.o
|
||||
obj-$(CONFIG_AD5686) += ad5686.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,430 @@
|
|||
/*
|
||||
* AD5721, AD5721R, AD5761, AD5761R, Voltage Output Digital to Analog Converter
|
||||
*
|
||||
* Copyright 2016 Qtechnology A/S
|
||||
* 2016 Ricardo Ribalda <ricardo.ribalda@gmail.com>
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/iio/iio.h>
|
||||
#include <linux/iio/sysfs.h>
|
||||
#include <linux/regulator/consumer.h>
|
||||
#include <linux/platform_data/ad5761.h>
|
||||
|
||||
#define AD5761_ADDR(addr) ((addr & 0xf) << 16)
|
||||
#define AD5761_ADDR_NOOP 0x0
|
||||
#define AD5761_ADDR_DAC_WRITE 0x3
|
||||
#define AD5761_ADDR_CTRL_WRITE_REG 0x4
|
||||
#define AD5761_ADDR_SW_DATA_RESET 0x7
|
||||
#define AD5761_ADDR_DAC_READ 0xb
|
||||
#define AD5761_ADDR_CTRL_READ_REG 0xc
|
||||
#define AD5761_ADDR_SW_FULL_RESET 0xf
|
||||
|
||||
#define AD5761_CTRL_USE_INTVREF BIT(5)
|
||||
#define AD5761_CTRL_ETS BIT(6)
|
||||
|
||||
/**
|
||||
* struct ad5761_chip_info - chip specific information
|
||||
* @int_vref: Value of the internal reference voltage in mV - 0 if external
|
||||
* reference voltage is used
|
||||
* @channel: channel specification
|
||||
*/
|
||||
|
||||
struct ad5761_chip_info {
|
||||
unsigned long int_vref;
|
||||
const struct iio_chan_spec channel;
|
||||
};
|
||||
|
||||
struct ad5761_range_params {
|
||||
int m;
|
||||
int c;
|
||||
};
|
||||
|
||||
enum ad5761_supported_device_ids {
|
||||
ID_AD5721,
|
||||
ID_AD5721R,
|
||||
ID_AD5761,
|
||||
ID_AD5761R,
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ad5761_state - driver instance specific data
|
||||
* @spi: spi_device
|
||||
* @vref_reg: reference voltage regulator
|
||||
* @use_intref: true when the internal voltage reference is used
|
||||
* @vref: actual voltage reference in mVolts
|
||||
* @range: output range mode used
|
||||
* @data: cache aligned spi buffer
|
||||
*/
|
||||
struct ad5761_state {
|
||||
struct spi_device *spi;
|
||||
struct regulator *vref_reg;
|
||||
|
||||
bool use_intref;
|
||||
int vref;
|
||||
enum ad5761_voltage_range range;
|
||||
|
||||
/*
|
||||
* DMA (thus cache coherency maintenance) requires the
|
||||
* transfer buffers to live in their own cache lines.
|
||||
*/
|
||||
union {
|
||||
__be32 d32;
|
||||
u8 d8[4];
|
||||
} data[3] ____cacheline_aligned;
|
||||
};
|
||||
|
||||
static const struct ad5761_range_params ad5761_range_params[] = {
|
||||
[AD5761_VOLTAGE_RANGE_M10V_10V] = {
|
||||
.m = 80,
|
||||
.c = 40,
|
||||
},
|
||||
[AD5761_VOLTAGE_RANGE_0V_10V] = {
|
||||
.m = 40,
|
||||
.c = 0,
|
||||
},
|
||||
[AD5761_VOLTAGE_RANGE_M5V_5V] = {
|
||||
.m = 40,
|
||||
.c = 20,
|
||||
},
|
||||
[AD5761_VOLTAGE_RANGE_0V_5V] = {
|
||||
.m = 20,
|
||||
.c = 0,
|
||||
},
|
||||
[AD5761_VOLTAGE_RANGE_M2V5_7V5] = {
|
||||
.m = 40,
|
||||
.c = 10,
|
||||
},
|
||||
[AD5761_VOLTAGE_RANGE_M3V_3V] = {
|
||||
.m = 24,
|
||||
.c = 12,
|
||||
},
|
||||
[AD5761_VOLTAGE_RANGE_0V_16V] = {
|
||||
.m = 64,
|
||||
.c = 0,
|
||||
},
|
||||
[AD5761_VOLTAGE_RANGE_0V_20V] = {
|
||||
.m = 80,
|
||||
.c = 0,
|
||||
},
|
||||
};
|
||||
|
||||
static int _ad5761_spi_write(struct ad5761_state *st, u8 addr, u16 val)
|
||||
{
|
||||
st->data[0].d32 = cpu_to_be32(AD5761_ADDR(addr) | val);
|
||||
|
||||
return spi_write(st->spi, &st->data[0].d8[1], 3);
|
||||
}
|
||||
|
||||
static int ad5761_spi_write(struct iio_dev *indio_dev, u8 addr, u16 val)
|
||||
{
|
||||
struct ad5761_state *st = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
mutex_lock(&indio_dev->mlock);
|
||||
ret = _ad5761_spi_write(st, addr, val);
|
||||
mutex_unlock(&indio_dev->mlock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int _ad5761_spi_read(struct ad5761_state *st, u8 addr, u16 *val)
|
||||
{
|
||||
int ret;
|
||||
struct spi_transfer xfers[] = {
|
||||
{
|
||||
.tx_buf = &st->data[0].d8[1],
|
||||
.bits_per_word = 8,
|
||||
.len = 3,
|
||||
.cs_change = true,
|
||||
}, {
|
||||
.tx_buf = &st->data[1].d8[1],
|
||||
.rx_buf = &st->data[2].d8[1],
|
||||
.bits_per_word = 8,
|
||||
.len = 3,
|
||||
},
|
||||
};
|
||||
|
||||
st->data[0].d32 = cpu_to_be32(AD5761_ADDR(addr));
|
||||
st->data[1].d32 = cpu_to_be32(AD5761_ADDR(AD5761_ADDR_NOOP));
|
||||
|
||||
ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));
|
||||
|
||||
*val = be32_to_cpu(st->data[2].d32);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad5761_spi_read(struct iio_dev *indio_dev, u8 addr, u16 *val)
|
||||
{
|
||||
struct ad5761_state *st = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
mutex_lock(&indio_dev->mlock);
|
||||
ret = _ad5761_spi_read(st, addr, val);
|
||||
mutex_unlock(&indio_dev->mlock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad5761_spi_set_range(struct ad5761_state *st,
|
||||
enum ad5761_voltage_range range)
|
||||
{
|
||||
u16 aux;
|
||||
int ret;
|
||||
|
||||
aux = (range & 0x7) | AD5761_CTRL_ETS;
|
||||
|
||||
if (st->use_intref)
|
||||
aux |= AD5761_CTRL_USE_INTVREF;
|
||||
|
||||
ret = _ad5761_spi_write(st, AD5761_ADDR_SW_FULL_RESET, 0);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = _ad5761_spi_write(st, AD5761_ADDR_CTRL_WRITE_REG, aux);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
st->range = range;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ad5761_read_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int *val,
|
||||
int *val2,
|
||||
long mask)
|
||||
{
|
||||
struct ad5761_state *st;
|
||||
int ret;
|
||||
u16 aux;
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
ret = ad5761_spi_read(indio_dev, AD5761_ADDR_DAC_READ, &aux);
|
||||
if (ret)
|
||||
return ret;
|
||||
*val = aux >> chan->scan_type.shift;
|
||||
return IIO_VAL_INT;
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
st = iio_priv(indio_dev);
|
||||
*val = st->vref * ad5761_range_params[st->range].m;
|
||||
*val /= 10;
|
||||
*val2 = chan->scan_type.realbits;
|
||||
return IIO_VAL_FRACTIONAL_LOG2;
|
||||
case IIO_CHAN_INFO_OFFSET:
|
||||
st = iio_priv(indio_dev);
|
||||
*val = -(1 << chan->scan_type.realbits);
|
||||
*val *= ad5761_range_params[st->range].c;
|
||||
*val /= ad5761_range_params[st->range].m;
|
||||
return IIO_VAL_INT;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int ad5761_write_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int val,
|
||||
int val2,
|
||||
long mask)
|
||||
{
|
||||
u16 aux;
|
||||
|
||||
if (mask != IIO_CHAN_INFO_RAW)
|
||||
return -EINVAL;
|
||||
|
||||
if (val2 || (val << chan->scan_type.shift) > 0xffff || val < 0)
|
||||
return -EINVAL;
|
||||
|
||||
aux = val << chan->scan_type.shift;
|
||||
|
||||
return ad5761_spi_write(indio_dev, AD5761_ADDR_DAC_WRITE, aux);
|
||||
}
|
||||
|
||||
static const struct iio_info ad5761_info = {
|
||||
.read_raw = &ad5761_read_raw,
|
||||
.write_raw = &ad5761_write_raw,
|
||||
.driver_module = THIS_MODULE,
|
||||
};
|
||||
|
||||
#define AD5761_CHAN(_bits) { \
|
||||
.type = IIO_VOLTAGE, \
|
||||
.output = 1, \
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
||||
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
|
||||
BIT(IIO_CHAN_INFO_OFFSET), \
|
||||
.scan_type = { \
|
||||
.sign = 'u', \
|
||||
.realbits = (_bits), \
|
||||
.storagebits = 16, \
|
||||
.shift = 16 - (_bits), \
|
||||
}, \
|
||||
}
|
||||
|
||||
static const struct ad5761_chip_info ad5761_chip_infos[] = {
|
||||
[ID_AD5721] = {
|
||||
.int_vref = 0,
|
||||
.channel = AD5761_CHAN(12),
|
||||
},
|
||||
[ID_AD5721R] = {
|
||||
.int_vref = 2500,
|
||||
.channel = AD5761_CHAN(12),
|
||||
},
|
||||
[ID_AD5761] = {
|
||||
.int_vref = 0,
|
||||
.channel = AD5761_CHAN(16),
|
||||
},
|
||||
[ID_AD5761R] = {
|
||||
.int_vref = 2500,
|
||||
.channel = AD5761_CHAN(16),
|
||||
},
|
||||
};
|
||||
|
||||
static int ad5761_get_vref(struct ad5761_state *st,
|
||||
const struct ad5761_chip_info *chip_info)
|
||||
{
|
||||
int ret;
|
||||
|
||||
st->vref_reg = devm_regulator_get_optional(&st->spi->dev, "vref");
|
||||
if (PTR_ERR(st->vref_reg) == -ENODEV) {
|
||||
/* Use Internal regulator */
|
||||
if (!chip_info->int_vref) {
|
||||
dev_err(&st->spi->dev,
|
||||
"Voltage reference not found\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
st->use_intref = true;
|
||||
st->vref = chip_info->int_vref;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (IS_ERR(st->vref_reg)) {
|
||||
dev_err(&st->spi->dev,
|
||||
"Error getting voltage reference regulator\n");
|
||||
return PTR_ERR(st->vref_reg);
|
||||
}
|
||||
|
||||
ret = regulator_enable(st->vref_reg);
|
||||
if (ret) {
|
||||
dev_err(&st->spi->dev,
|
||||
"Failed to enable voltage reference\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = regulator_get_voltage(st->vref_reg);
|
||||
if (ret < 0) {
|
||||
dev_err(&st->spi->dev,
|
||||
"Failed to get voltage reference value\n");
|
||||
goto disable_regulator_vref;
|
||||
}
|
||||
|
||||
if (ret < 2000000 || ret > 3000000) {
|
||||
dev_warn(&st->spi->dev,
|
||||
"Invalid external voltage ref. value %d uV\n", ret);
|
||||
ret = -EIO;
|
||||
goto disable_regulator_vref;
|
||||
}
|
||||
|
||||
st->vref = ret / 1000;
|
||||
st->use_intref = false;
|
||||
|
||||
return 0;
|
||||
|
||||
disable_regulator_vref:
|
||||
regulator_disable(st->vref_reg);
|
||||
st->vref_reg = NULL;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad5761_probe(struct spi_device *spi)
|
||||
{
|
||||
struct iio_dev *iio_dev;
|
||||
struct ad5761_state *st;
|
||||
int ret;
|
||||
const struct ad5761_chip_info *chip_info =
|
||||
&ad5761_chip_infos[spi_get_device_id(spi)->driver_data];
|
||||
enum ad5761_voltage_range voltage_range = AD5761_VOLTAGE_RANGE_0V_5V;
|
||||
struct ad5761_platform_data *pdata = dev_get_platdata(&spi->dev);
|
||||
|
||||
iio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
|
||||
if (!iio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
st = iio_priv(iio_dev);
|
||||
|
||||
st->spi = spi;
|
||||
spi_set_drvdata(spi, iio_dev);
|
||||
|
||||
ret = ad5761_get_vref(st, chip_info);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (pdata)
|
||||
voltage_range = pdata->voltage_range;
|
||||
|
||||
ret = ad5761_spi_set_range(st, voltage_range);
|
||||
if (ret)
|
||||
goto disable_regulator_err;
|
||||
|
||||
iio_dev->dev.parent = &spi->dev;
|
||||
iio_dev->info = &ad5761_info;
|
||||
iio_dev->modes = INDIO_DIRECT_MODE;
|
||||
iio_dev->channels = &chip_info->channel;
|
||||
iio_dev->num_channels = 1;
|
||||
iio_dev->name = spi_get_device_id(st->spi)->name;
|
||||
ret = iio_device_register(iio_dev);
|
||||
if (ret)
|
||||
goto disable_regulator_err;
|
||||
|
||||
return 0;
|
||||
|
||||
disable_regulator_err:
|
||||
if (!IS_ERR_OR_NULL(st->vref_reg))
|
||||
regulator_disable(st->vref_reg);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad5761_remove(struct spi_device *spi)
|
||||
{
|
||||
struct iio_dev *iio_dev = spi_get_drvdata(spi);
|
||||
struct ad5761_state *st = iio_priv(iio_dev);
|
||||
|
||||
iio_device_unregister(iio_dev);
|
||||
|
||||
if (!IS_ERR_OR_NULL(st->vref_reg))
|
||||
regulator_disable(st->vref_reg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct spi_device_id ad5761_id[] = {
|
||||
{"ad5721", ID_AD5721},
|
||||
{"ad5721r", ID_AD5721R},
|
||||
{"ad5761", ID_AD5761},
|
||||
{"ad5761r", ID_AD5761R},
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, ad5761_id);
|
||||
|
||||
static struct spi_driver ad5761_driver = {
|
||||
.driver = {
|
||||
.name = "ad5761",
|
||||
},
|
||||
.probe = ad5761_probe,
|
||||
.remove = ad5761_remove,
|
||||
.id_table = ad5761_id,
|
||||
};
|
||||
module_spi_driver(ad5761_driver);
|
||||
|
||||
MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>");
|
||||
MODULE_DESCRIPTION("Analog Devices AD5721, AD5721R, AD5761, AD5761R driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,44 @@
|
|||
/*
|
||||
* AD5721, AD5721R, AD5761, AD5761R, Voltage Output Digital to Analog Converter
|
||||
*
|
||||
* Copyright 2016 Qtechnology A/S
|
||||
* 2016 Ricardo Ribalda <ricardo.ribalda@gmail.com>
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
#ifndef __LINUX_PLATFORM_DATA_AD5761_H__
|
||||
#define __LINUX_PLATFORM_DATA_AD5761_H__
|
||||
|
||||
/**
|
||||
* enum ad5761_voltage_range - Voltage range the AD5761 is configured for.
|
||||
* @AD5761_VOLTAGE_RANGE_M10V_10V: -10V to 10V
|
||||
* @AD5761_VOLTAGE_RANGE_0V_10V: 0V to 10V
|
||||
* @AD5761_VOLTAGE_RANGE_M5V_5V: -5V to 5V
|
||||
* @AD5761_VOLTAGE_RANGE_0V_5V: 0V to 5V
|
||||
* @AD5761_VOLTAGE_RANGE_M2V5_7V5: -2.5V to 7.5V
|
||||
* @AD5761_VOLTAGE_RANGE_M3V_3V: -3V to 3V
|
||||
* @AD5761_VOLTAGE_RANGE_0V_16V: 0V to 16V
|
||||
* @AD5761_VOLTAGE_RANGE_0V_20V: 0V to 20V
|
||||
*/
|
||||
|
||||
enum ad5761_voltage_range {
|
||||
AD5761_VOLTAGE_RANGE_M10V_10V,
|
||||
AD5761_VOLTAGE_RANGE_0V_10V,
|
||||
AD5761_VOLTAGE_RANGE_M5V_5V,
|
||||
AD5761_VOLTAGE_RANGE_0V_5V,
|
||||
AD5761_VOLTAGE_RANGE_M2V5_7V5,
|
||||
AD5761_VOLTAGE_RANGE_M3V_3V,
|
||||
AD5761_VOLTAGE_RANGE_0V_16V,
|
||||
AD5761_VOLTAGE_RANGE_0V_20V,
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ad5761_platform_data - AD5761 DAC driver platform data
|
||||
* @voltage_range: Voltage range the AD5761 is configured for
|
||||
*/
|
||||
|
||||
struct ad5761_platform_data {
|
||||
enum ad5761_voltage_range voltage_range;
|
||||
};
|
||||
|
||||
#endif
|
||||
Загрузка…
Ссылка в новой задаче