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staging: iio: dac: new driver for AD5624R devices 

This is used to convert digital streams into voltages.

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Barry Song 2010-10-27 21:44:07 -04:00 committed by Greg Kroah-Hartman
parent 7a83f60d7b
commit 6790e29fef
7 changed files with 358 additions and 0 deletions
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1
drivers/staging/iio/Kconfig
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@ -43,6 +43,7 @@ config IIO_TRIGGER
source "drivers/staging/iio/accel/Kconfig"
source "drivers/staging/iio/adc/Kconfig"
source "drivers/staging/iio/addac/Kconfig"
source "drivers/staging/iio/dac/Kconfig"
source "drivers/staging/iio/gyro/Kconfig"
source "drivers/staging/iio/imu/Kconfig"
source "drivers/staging/iio/light/Kconfig"

1
drivers/staging/iio/Makefile
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@ -12,6 +12,7 @@ obj-$(CONFIG_IIO_SW_RING) += ring_sw.o
obj-y += accel/
obj-y += adc/
obj-y += addac/
obj-y += dac/
obj-y += gyro/
obj-y += imu/
obj-y += light/

11
drivers/staging/iio/dac/Kconfig 100644
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@ -0,0 +1,11 @@
#
# DAC drivers
#
comment "Digital to analog convertors"
config AD5624R_SPI
tristate "Analog Devices AD5624/44/64R DAC spi driver"
depends on SPI
help
Say yes here to build support for Analog Devices AD5624R, AD5644R and
AD5664R convertors (DAC). This driver uses the common SPI interface.

5
drivers/staging/iio/dac/Makefile 100644
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@ -0,0 +1,5 @@
#
# Makefile for industrial I/O DAC drivers
#
obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o

21
drivers/staging/iio/dac/ad5624r.h 100644
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@ -0,0 +1,21 @@
#ifndef SPI_AD5624R_H_
#define SPI_AD5624R_H_
#define AD5624R_DAC_CHANNELS 4
#define AD5624R_ADDR_DAC0 0x0
#define AD5624R_ADDR_DAC1 0x1
#define AD5624R_ADDR_DAC2 0x2
#define AD5624R_ADDR_DAC3 0x3
#define AD5624R_ADDR_ALL_DAC 0x7
#define AD5624R_CMD_WRITE_INPUT_N 0x0
#define AD5624R_CMD_UPDATE_DAC_N 0x1
#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2
#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_N 0x3
#define AD5624R_CMD_POWERDOWN_DAC 0x4
#define AD5624R_CMD_RESET 0x5
#define AD5624R_CMD_LDAC_SETUP 0x6
#define AD5624R_CMD_INTERNAL_REFER_SETUP 0x7
#endif

313
drivers/staging/iio/dac/ad5624r_spi.c 100644
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@ -0,0 +1,313 @@
/*
* AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.h>
#include <linux/gpio.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/delay.h>
#include "../iio.h"
#include "../sysfs.h"
#include "dac.h"
#include "ad5624r.h"
/**
* struct ad5624r_state - device related storage
* @indio_dev: associated industrial IO device
* @us: spi device
**/
struct ad5624r_state {
struct iio_dev *indio_dev;
struct spi_device *us;
int data_len;
int ldac_mode;
int dac_power_mode[AD5624R_DAC_CHANNELS];
int internal_ref;
};
static int ad5624r_spi_write(struct spi_device *spi, u8 cmd, u8 addr, u16 val, u8 len)
{
struct spi_transfer t;
struct spi_message m;
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.
*/
data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
msg[0] = data >> 16;
msg[1] = data >> 8;
msg[2] = data;
spi_message_init(&m);
memset(&t, 0, (sizeof t));
t.tx_buf = &msg[0];
t.len = 3;
spi_message_add_tail(&t, &m);
spi_sync(spi, &m);
return len;
}
static ssize_t ad5624r_write_dac(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
long readin;
int ret;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5624r_state *st = indio_dev->dev_data;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ret = strict_strtol(buf, 10, &readin);
if (ret)
return ret;
ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
this_attr->address, readin, st->data_len);
return ret ? ret : len;
}
static ssize_t ad5624r_read_ldac_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5624r_state *st = indio_dev->dev_data;
return sprintf(buf, "%x\n", st->ldac_mode);
}
static ssize_t ad5624r_write_ldac_mode(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
long readin;
int ret;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5624r_state *st = indio_dev->dev_data;
ret = strict_strtol(buf, 16, &readin);
if (ret)
return ret;
ad5624r_spi_write(st->us, AD5624R_CMD_LDAC_SETUP, 0, readin & 0xF, 16);
st->ldac_mode = readin & 0xF;
return ret ? ret : len;
}
static ssize_t ad5624r_read_dac_power_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5624r_state *st = indio_dev->dev_data;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
return sprintf(buf, "%d\n", st->dac_power_mode[this_attr->address]);
}
static ssize_t ad5624r_write_dac_power_mode(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
long readin;
int ret;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5624r_state *st = indio_dev->dev_data;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
ret = strict_strtol(buf, 10, &readin);
if (ret)
return ret;
ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
((readin & 0x3) << 4) | (1 << this_attr->address), 16);
st->dac_power_mode[this_attr->address] = readin & 0x3;
return ret ? ret : len;
}
static ssize_t ad5624r_read_internal_ref_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5624r_state *st = indio_dev->dev_data;
return sprintf(buf, "%d\n", st->internal_ref);
}
static ssize_t ad5624r_write_internal_ref_mode(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
long readin;
int ret;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5624r_state *st = indio_dev->dev_data;
ret = strict_strtol(buf, 10, &readin);
if (ret)
return ret;
ad5624r_spi_write(st->us, AD5624R_CMD_INTERNAL_REFER_SETUP, 0, !!readin, 16);
st->internal_ref = !!readin;
return ret ? ret : len;
}
static IIO_DEV_ATTR_DAC(0, ad5624r_write_dac, AD5624R_ADDR_DAC0);
static IIO_DEV_ATTR_DAC(1, ad5624r_write_dac, AD5624R_ADDR_DAC1);
static IIO_DEV_ATTR_DAC(2, ad5624r_write_dac, AD5624R_ADDR_DAC2);
static IIO_DEV_ATTR_DAC(3, ad5624r_write_dac, AD5624R_ADDR_DAC3);
static IIO_DEVICE_ATTR(ldac_mode, S_IRUGO | S_IWUSR, ad5624r_read_ldac_mode,
ad5624r_write_ldac_mode, 0);
static IIO_DEVICE_ATTR(internal_ref, S_IRUGO | S_IWUSR, ad5624r_read_internal_ref_mode,
ad5624r_write_internal_ref_mode, 0);
#define IIO_DEV_ATTR_DAC_POWER_MODE(_num, _show, _store, _addr) \
IIO_DEVICE_ATTR(dac_power_mode_##_num, S_IRUGO | S_IWUSR, _show, _store, _addr)
static IIO_DEV_ATTR_DAC_POWER_MODE(0, ad5624r_read_dac_power_mode, ad5624r_write_dac_power_mode, 0);
static IIO_DEV_ATTR_DAC_POWER_MODE(1, ad5624r_read_dac_power_mode, ad5624r_write_dac_power_mode, 1);
static IIO_DEV_ATTR_DAC_POWER_MODE(2, ad5624r_read_dac_power_mode, ad5624r_write_dac_power_mode, 2);
static IIO_DEV_ATTR_DAC_POWER_MODE(3, ad5624r_read_dac_power_mode, ad5624r_write_dac_power_mode, 3);
static struct attribute *ad5624r_attributes[] = {
&iio_dev_attr_dac_0.dev_attr.attr,
&iio_dev_attr_dac_1.dev_attr.attr,
&iio_dev_attr_dac_2.dev_attr.attr,
&iio_dev_attr_dac_3.dev_attr.attr,
&iio_dev_attr_dac_power_mode_0.dev_attr.attr,
&iio_dev_attr_dac_power_mode_1.dev_attr.attr,
&iio_dev_attr_dac_power_mode_2.dev_attr.attr,
&iio_dev_attr_dac_power_mode_3.dev_attr.attr,
&iio_dev_attr_ldac_mode.dev_attr.attr,
&iio_dev_attr_internal_ref.dev_attr.attr,
NULL,
};
static const struct attribute_group ad5624r_attribute_group = {
.attrs = ad5624r_attributes,
};
static int __devinit ad5624r_probe(struct spi_device *spi)
{
struct ad5624r_state *st;
int ret = 0;
char *chip_name = spi->dev.platform_data;
if (!chip_name)
return -ENODEV;
st = kzalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL) {
ret = -ENOMEM;
goto error_ret;
}
spi_set_drvdata(spi, st);
if (strcmp(chip_name, "ad5624r") == 0)
st->data_len = 12;
else if (strcmp(chip_name, "ad5644r") == 0)
st->data_len = 14;
else if (strcmp(chip_name, "ad5664r") == 0)
st->data_len = 16;
else {
dev_err(&spi->dev, "not supported chip type\n");
ret = -EINVAL;
goto error_ret;
}
st->us = spi;
st->indio_dev = iio_allocate_device();
if (st->indio_dev == NULL) {
ret = -ENOMEM;
goto error_free_st;
}
st->indio_dev->dev.parent = &spi->dev;
st->indio_dev->num_interrupt_lines = 0;
st->indio_dev->event_attrs = NULL;
st->indio_dev->attrs = &ad5624r_attribute_group;
st->indio_dev->dev_data = (void *)(st);
st->indio_dev->driver_module = THIS_MODULE;
st->indio_dev->modes = INDIO_DIRECT_MODE;
ret = iio_device_register(st->indio_dev);
if (ret)
goto error_free_dev;
spi->mode = SPI_MODE_0;
spi_setup(spi);
return 0;
error_free_dev:
iio_free_device(st->indio_dev);
error_free_st:
kfree(st);
error_ret:
return ret;
}
static int __devexit ad5624r_remove(struct spi_device *spi)
{
struct ad5624r_state *st = spi_get_drvdata(spi);
iio_device_unregister(st->indio_dev);
kfree(st);
return 0;
}
static struct spi_driver ad5624r_driver = {
.driver = {
.name = "ad5624r",
.owner = THIS_MODULE,
},
.probe = ad5624r_probe,
.remove = __devexit_p(ad5624r_remove),
};
static __init int ad5624r_spi_init(void)
{
return spi_register_driver(&ad5624r_driver);
}
module_init(ad5624r_spi_init);
static __exit void ad5624r_spi_exit(void)
{
spi_unregister_driver(&ad5624r_driver);
}
module_exit(ad5624r_spi_exit);
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
MODULE_LICENSE("GPL v2");

6
drivers/staging/iio/dac/dac.h 100644
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@ -0,0 +1,6 @@
/*
* dac.h - sysfs attributes associated with DACs
*/
#define IIO_DEV_ATTR_DAC(_num, _store, _addr) \
IIO_DEVICE_ATTR(dac_##_num, S_IWUSR, NULL, _store, _addr)