2010-10-28 03:44:07 +02:00
|
|
|
/*
|
|
|
|
* AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
|
|
|
|
*
|
2011-03-09 16:01:45 +01:00
|
|
|
* Copyright 2010-2011 Analog Devices Inc.
|
2010-10-28 03:44:07 +02:00
|
|
|
*
|
2011-03-09 16:01:45 +01:00
|
|
|
* Licensed under the GPL-2.
|
2010-10-28 03:44:07 +02:00
|
|
|
*/
|
|
|
|
|
|
|
|
#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>
|
2011-03-09 16:01:45 +01:00
|
|
|
#include <linux/regulator/consumer.h>
|
2011-07-03 21:49:50 +02:00
|
|
|
#include <linux/module.h>
|
2010-10-28 03:44:07 +02:00
|
|
|
|
|
|
|
#include "../iio.h"
|
|
|
|
#include "../sysfs.h"
|
|
|
|
#include "dac.h"
|
|
|
|
#include "ad5624r.h"
|
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
|
|
|
|
[ID_AD5624R3] = {
|
|
|
|
.bits = 12,
|
|
|
|
.int_vref_mv = 1250,
|
|
|
|
},
|
|
|
|
[ID_AD5644R3] = {
|
|
|
|
.bits = 14,
|
|
|
|
.int_vref_mv = 1250,
|
|
|
|
},
|
|
|
|
[ID_AD5664R3] = {
|
|
|
|
.bits = 16,
|
|
|
|
.int_vref_mv = 1250,
|
|
|
|
},
|
|
|
|
[ID_AD5624R5] = {
|
|
|
|
.bits = 12,
|
|
|
|
.int_vref_mv = 2500,
|
|
|
|
},
|
|
|
|
[ID_AD5644R5] = {
|
|
|
|
.bits = 14,
|
|
|
|
.int_vref_mv = 2500,
|
|
|
|
},
|
|
|
|
[ID_AD5664R5] = {
|
|
|
|
.bits = 16,
|
|
|
|
.int_vref_mv = 2500,
|
|
|
|
},
|
2010-10-28 03:44:07 +02:00
|
|
|
};
|
|
|
|
|
2010-11-19 15:16:44 +01:00
|
|
|
static int ad5624r_spi_write(struct spi_device *spi,
|
|
|
|
u8 cmd, u8 addr, u16 val, u8 len)
|
2010-10-28 03:44:07 +02:00
|
|
|
{
|
|
|
|
u32 data;
|
|
|
|
u8 msg[3];
|
|
|
|
|
|
|
|
/*
|
2011-03-09 16:01:45 +01:00
|
|
|
* 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.
|
2010-10-28 03:44:07 +02:00
|
|
|
*/
|
|
|
|
data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
|
|
|
|
msg[0] = data >> 16;
|
|
|
|
msg[1] = data >> 8;
|
|
|
|
msg[2] = data;
|
|
|
|
|
2010-11-19 15:16:44 +01:00
|
|
|
return spi_write(spi, msg, 3);
|
2010-10-28 03:44:07 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t ad5624r_write_dac(struct device *dev,
|
2010-11-19 15:16:46 +01:00
|
|
|
struct device_attribute *attr,
|
|
|
|
const char *buf, size_t len)
|
2010-10-28 03:44:07 +02:00
|
|
|
{
|
|
|
|
long readin;
|
|
|
|
int ret;
|
|
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
2011-06-27 14:07:31 +02:00
|
|
|
struct ad5624r_state *st = iio_priv(indio_dev);
|
2010-10-28 03:44:07 +02:00
|
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
|
|
|
|
|
|
ret = strict_strtol(buf, 10, &readin);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
2010-11-19 15:16:44 +01:00
|
|
|
ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
|
2011-03-09 16:01:45 +01:00
|
|
|
this_attr->address, readin,
|
|
|
|
st->chip_info->bits);
|
2010-10-28 03:44:07 +02:00
|
|
|
return ret ? ret : len;
|
|
|
|
}
|
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
static ssize_t ad5624r_read_powerdown_mode(struct device *dev,
|
2010-11-19 15:16:46 +01:00
|
|
|
struct device_attribute *attr, char *buf)
|
2010-10-28 03:44:07 +02:00
|
|
|
{
|
|
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
2011-06-27 14:07:31 +02:00
|
|
|
struct ad5624r_state *st = iio_priv(indio_dev);
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
|
|
|
|
|
|
|
|
return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
|
2010-10-28 03:44:07 +02:00
|
|
|
}
|
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
static ssize_t ad5624r_write_powerdown_mode(struct device *dev,
|
2010-11-19 15:16:46 +01:00
|
|
|
struct device_attribute *attr,
|
|
|
|
const char *buf, size_t len)
|
2010-10-28 03:44:07 +02:00
|
|
|
{
|
|
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
2011-06-27 14:07:31 +02:00
|
|
|
struct ad5624r_state *st = iio_priv(indio_dev);
|
2011-03-09 16:01:45 +01:00
|
|
|
int ret;
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
if (sysfs_streq(buf, "1kohm_to_gnd"))
|
|
|
|
st->pwr_down_mode = AD5624R_LDAC_PWRDN_1K;
|
|
|
|
else if (sysfs_streq(buf, "100kohm_to_gnd"))
|
|
|
|
st->pwr_down_mode = AD5624R_LDAC_PWRDN_100K;
|
|
|
|
else if (sysfs_streq(buf, "three_state"))
|
|
|
|
st->pwr_down_mode = AD5624R_LDAC_PWRDN_3STATE;
|
|
|
|
else
|
|
|
|
ret = -EINVAL;
|
2010-10-28 03:44:07 +02:00
|
|
|
|
|
|
|
return ret ? ret : len;
|
|
|
|
}
|
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
static ssize_t ad5624r_read_dac_powerdown(struct device *dev,
|
2010-11-19 15:16:46 +01:00
|
|
|
struct device_attribute *attr,
|
|
|
|
char *buf)
|
2010-10-28 03:44:07 +02:00
|
|
|
{
|
|
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
2011-06-27 14:07:31 +02:00
|
|
|
struct ad5624r_state *st = iio_priv(indio_dev);
|
2010-10-28 03:44:07 +02:00
|
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
return sprintf(buf, "%d\n",
|
|
|
|
!!(st->pwr_down_mask & (1 << this_attr->address)));
|
2010-10-28 03:44:07 +02:00
|
|
|
}
|
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
static ssize_t ad5624r_write_dac_powerdown(struct device *dev,
|
2010-11-19 15:16:46 +01:00
|
|
|
struct device_attribute *attr,
|
|
|
|
const char *buf, size_t len)
|
2010-10-28 03:44:07 +02:00
|
|
|
{
|
|
|
|
long readin;
|
|
|
|
int ret;
|
|
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
2011-06-27 14:07:31 +02:00
|
|
|
struct ad5624r_state *st = iio_priv(indio_dev);
|
2010-10-28 03:44:07 +02:00
|
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
|
|
|
|
|
|
ret = strict_strtol(buf, 10, &readin);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
if (readin == 1)
|
|
|
|
st->pwr_down_mask |= (1 << this_attr->address);
|
|
|
|
else if (!readin)
|
|
|
|
st->pwr_down_mask &= ~(1 << this_attr->address);
|
|
|
|
else
|
|
|
|
ret = -EINVAL;
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
|
|
|
|
(st->pwr_down_mode << 4) |
|
|
|
|
st->pwr_down_mask, 16);
|
2010-10-28 03:44:07 +02:00
|
|
|
|
|
|
|
return ret ? ret : len;
|
|
|
|
}
|
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
static ssize_t ad5624r_show_scale(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
char *buf)
|
2010-10-28 03:44:07 +02:00
|
|
|
{
|
2011-03-10 09:09:47 +01:00
|
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
2011-06-27 14:07:31 +02:00
|
|
|
struct ad5624r_state *st = iio_priv(indio_dev);
|
2011-03-09 16:01:45 +01:00
|
|
|
/* Corresponds to Vref / 2^(bits) */
|
|
|
|
unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
|
2010-10-28 03:44:07 +02:00
|
|
|
}
|
2011-09-14 14:01:23 +02:00
|
|
|
static IIO_DEVICE_ATTR(out_voltage_scale, S_IRUGO, ad5624r_show_scale, NULL, 0);
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2010-11-19 15:16:43 +01:00
|
|
|
static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0);
|
|
|
|
static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1);
|
|
|
|
static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2);
|
|
|
|
static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3);
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2011-09-14 14:01:23 +02:00
|
|
|
static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO |
|
2011-03-09 16:01:45 +01:00
|
|
|
S_IWUSR, ad5624r_read_powerdown_mode,
|
|
|
|
ad5624r_write_powerdown_mode, 0);
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2011-09-14 14:01:23 +02:00
|
|
|
static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
|
2011-03-09 16:01:45 +01:00
|
|
|
"1kohm_to_gnd 100kohm_to_gnd three_state");
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
|
2011-09-14 14:01:23 +02:00
|
|
|
IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \
|
2011-03-09 16:01:45 +01:00
|
|
|
S_IRUGO | S_IWUSR, _show, _store, _addr)
|
|
|
|
|
|
|
|
static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5624r_read_dac_powerdown,
|
|
|
|
ad5624r_write_dac_powerdown, 0);
|
|
|
|
static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5624r_read_dac_powerdown,
|
|
|
|
ad5624r_write_dac_powerdown, 1);
|
|
|
|
static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5624r_read_dac_powerdown,
|
|
|
|
ad5624r_write_dac_powerdown, 2);
|
|
|
|
static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5624r_read_dac_powerdown,
|
|
|
|
ad5624r_write_dac_powerdown, 3);
|
2010-10-28 03:44:07 +02:00
|
|
|
|
|
|
|
static struct attribute *ad5624r_attributes[] = {
|
2011-09-14 14:01:23 +02:00
|
|
|
&iio_dev_attr_out_voltage0_raw.dev_attr.attr,
|
|
|
|
&iio_dev_attr_out_voltage1_raw.dev_attr.attr,
|
|
|
|
&iio_dev_attr_out_voltage2_raw.dev_attr.attr,
|
|
|
|
&iio_dev_attr_out_voltage3_raw.dev_attr.attr,
|
|
|
|
&iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
|
|
|
|
&iio_dev_attr_out_voltage1_powerdown.dev_attr.attr,
|
|
|
|
&iio_dev_attr_out_voltage2_powerdown.dev_attr.attr,
|
|
|
|
&iio_dev_attr_out_voltage3_powerdown.dev_attr.attr,
|
|
|
|
&iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr,
|
|
|
|
&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
|
|
|
|
&iio_dev_attr_out_voltage_scale.dev_attr.attr,
|
2010-10-28 03:44:07 +02:00
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct attribute_group ad5624r_attribute_group = {
|
|
|
|
.attrs = ad5624r_attributes,
|
|
|
|
};
|
|
|
|
|
2011-05-18 15:42:37 +02:00
|
|
|
static const struct iio_info ad5624r_info = {
|
|
|
|
.attrs = &ad5624r_attribute_group,
|
|
|
|
.driver_module = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
2010-10-28 03:44:07 +02:00
|
|
|
static int __devinit ad5624r_probe(struct spi_device *spi)
|
|
|
|
{
|
|
|
|
struct ad5624r_state *st;
|
2011-06-27 14:07:31 +02:00
|
|
|
struct iio_dev *indio_dev;
|
2011-03-09 16:01:45 +01:00
|
|
|
int ret, voltage_uv = 0;
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2011-06-27 14:07:31 +02:00
|
|
|
indio_dev = iio_allocate_device(sizeof(*st));
|
|
|
|
if (indio_dev == NULL) {
|
|
|
|
ret = -ENOMEM;
|
2011-08-30 13:41:19 +02:00
|
|
|
goto error_ret;
|
2011-06-27 14:07:31 +02:00
|
|
|
}
|
|
|
|
st = iio_priv(indio_dev);
|
2011-08-30 13:41:19 +02:00
|
|
|
st->reg = regulator_get(&spi->dev, "vcc");
|
|
|
|
if (!IS_ERR(st->reg)) {
|
|
|
|
ret = regulator_enable(st->reg);
|
|
|
|
if (ret)
|
|
|
|
goto error_put_reg;
|
|
|
|
|
|
|
|
voltage_uv = regulator_get_voltage(st->reg);
|
|
|
|
}
|
|
|
|
|
2011-06-27 14:07:31 +02:00
|
|
|
spi_set_drvdata(spi, indio_dev);
|
2011-03-09 16:01:45 +01:00
|
|
|
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;
|
2010-10-28 03:44:07 +02:00
|
|
|
|
|
|
|
st->us = spi;
|
|
|
|
|
2011-06-27 14:07:31 +02:00
|
|
|
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;
|
|
|
|
|
2011-08-30 13:41:18 +02:00
|
|
|
ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
|
|
|
|
!!voltage_uv, 16);
|
2010-10-28 03:44:07 +02:00
|
|
|
if (ret)
|
2011-08-30 13:41:19 +02:00
|
|
|
goto error_disable_reg;
|
2010-10-28 03:44:07 +02:00
|
|
|
|
2011-08-30 13:41:18 +02:00
|
|
|
ret = iio_device_register(indio_dev);
|
2011-03-09 16:01:45 +01:00
|
|
|
if (ret)
|
2011-08-30 13:41:19 +02:00
|
|
|
goto error_disable_reg;
|
2010-10-28 03:44:07 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
2011-03-09 16:01:45 +01:00
|
|
|
error_disable_reg:
|
2011-08-30 13:41:19 +02:00
|
|
|
if (!IS_ERR(st->reg))
|
|
|
|
regulator_disable(st->reg);
|
2011-03-09 16:01:45 +01:00
|
|
|
error_put_reg:
|
2011-08-30 13:41:19 +02:00
|
|
|
if (!IS_ERR(st->reg))
|
|
|
|
regulator_put(st->reg);
|
|
|
|
iio_free_device(indio_dev);
|
|
|
|
error_ret:
|
2011-03-09 16:01:45 +01:00
|
|
|
|
2010-10-28 03:44:07 +02:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __devexit ad5624r_remove(struct spi_device *spi)
|
|
|
|
{
|
2011-06-27 14:07:31 +02:00
|
|
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
|
|
|
struct ad5624r_state *st = iio_priv(indio_dev);
|
|
|
|
|
2011-10-14 15:46:58 +02:00
|
|
|
iio_device_unregister(indio_dev);
|
2011-08-30 13:41:19 +02:00
|
|
|
if (!IS_ERR(st->reg)) {
|
|
|
|
regulator_disable(st->reg);
|
|
|
|
regulator_put(st->reg);
|
2011-03-09 16:01:45 +01:00
|
|
|
}
|
2011-10-14 15:46:58 +02:00
|
|
|
iio_free_device(indio_dev);
|
2011-03-09 16:01:45 +01:00
|
|
|
|
2010-10-28 03:44:07 +02:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-11-19 15:16:45 +01:00
|
|
|
static const struct spi_device_id ad5624r_id[] = {
|
2011-03-09 16:01:45 +01:00
|
|
|
{"ad5624r3", ID_AD5624R3},
|
|
|
|
{"ad5644r3", ID_AD5644R3},
|
|
|
|
{"ad5664r3", ID_AD5664R3},
|
|
|
|
{"ad5624r5", ID_AD5624R5},
|
|
|
|
{"ad5644r5", ID_AD5644R5},
|
|
|
|
{"ad5664r5", ID_AD5664R5},
|
2010-11-19 15:16:45 +01:00
|
|
|
{}
|
|
|
|
};
|
|
|
|
|
2010-10-28 03:44:07 +02:00
|
|
|
static struct spi_driver ad5624r_driver = {
|
|
|
|
.driver = {
|
2010-11-19 15:16:46 +01:00
|
|
|
.name = "ad5624r",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
2010-10-28 03:44:07 +02:00
|
|
|
.probe = ad5624r_probe,
|
|
|
|
.remove = __devexit_p(ad5624r_remove),
|
2010-11-19 15:16:45 +01:00
|
|
|
.id_table = ad5624r_id,
|
2010-10-28 03:44:07 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
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");
|