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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/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/regulator/consumer.h>
#include "../iio.h"
#include "../sysfs.h"
#include "dac.h"
#include "ad5624r.h"
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,
},
};
static int ad5624r_spi_write(struct spi_device *spi,
u8 cmd, u8 addr, u16 val, u8 len)
{
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;
return spi_write(spi, msg, 3);
}
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;
ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
this_attr->address, readin,
st->chip_info->bits);
return ret ? ret : len;
}
static ssize_t ad5624r_read_powerdown_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;
char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
}
static ssize_t ad5624r_write_powerdown_mode(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5624r_state *st = indio_dev->dev_data;
int ret;
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;
return ret ? ret : len;
}
static ssize_t ad5624r_read_dac_powerdown(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->pwr_down_mask & (1 << this_attr->address)));
}
static ssize_t ad5624r_write_dac_powerdown(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;
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;
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 ssize_t ad5624r_show_scale(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad5624r_state *st = iio_dev_get_devdata(dev_info);
/* Corresponds to Vref / 2^(bits) */
unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;
return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
}
static IIO_DEVICE_ATTR(out_scale, S_IRUGO, ad5624r_show_scale, NULL, 0);
static ssize_t ad5624r_show_name(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad5624r_state *st = iio_dev_get_devdata(dev_info);
return sprintf(buf, "%s\n", spi_get_device_id(st->us)->name);
}
static IIO_DEVICE_ATTR(name, S_IRUGO, ad5624r_show_name, NULL, 0);
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);
static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO |
S_IWUSR, ad5624r_read_powerdown_mode,
ad5624r_write_powerdown_mode, 0);
static IIO_CONST_ATTR(out_powerdown_mode_available,
"1kohm_to_gnd 100kohm_to_gnd three_state");
#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
IIO_DEVICE_ATTR(out##_num##_powerdown, \
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);
static struct attribute *ad5624r_attributes[] = {
&iio_dev_attr_out0_raw.dev_attr.attr,
&iio_dev_attr_out1_raw.dev_attr.attr,
&iio_dev_attr_out2_raw.dev_attr.attr,
&iio_dev_attr_out3_raw.dev_attr.attr,
&iio_dev_attr_out0_powerdown.dev_attr.attr,
&iio_dev_attr_out1_powerdown.dev_attr.attr,
&iio_dev_attr_out2_powerdown.dev_attr.attr,
&iio_dev_attr_out3_powerdown.dev_attr.attr,
&iio_dev_attr_out_powerdown_mode.dev_attr.attr,
&iio_const_attr_out_powerdown_mode_available.dev_attr.attr,
&iio_dev_attr_out_scale.dev_attr.attr,
&iio_dev_attr_name.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, voltage_uv = 0;
st = kzalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL) {
ret = -ENOMEM;
goto error_ret;
}
spi_set_drvdata(spi, st);
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);
}
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;
st->indio_dev = iio_allocate_device();
if (st->indio_dev == NULL) {
ret = -ENOMEM;
goto error_disable_reg;
}
st->indio_dev->dev.parent = &spi->dev;
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;
ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
!!voltage_uv, 16);
if (ret)
goto error_free_dev;
return 0;
error_free_dev:
iio_free_device(st->indio_dev);
error_disable_reg:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
error_put_reg:
if (!IS_ERR(st->reg))
regulator_put(st->reg);
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);
if (!IS_ERR(st->reg)) {
regulator_disable(st->reg);
regulator_put(st->reg);
}
kfree(st);
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},
{}
};
static struct spi_driver ad5624r_driver = {
.driver = {
.name = "ad5624r",
.owner = THIS_MODULE,
},
.probe = ad5624r_probe,
.remove = __devexit_p(ad5624r_remove),
.id_table = ad5624r_id,
};
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");
|