482 lines
11 KiB
C
482 lines
11 KiB
C
/*
|
|
* AD5446 SPI DAC driver
|
|
*
|
|
* Copyright 2010 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/list.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "../iio.h"
|
|
#include "../sysfs.h"
|
|
#include "dac.h"
|
|
|
|
#include "ad5446.h"
|
|
|
|
static void ad5446_store_sample(struct ad5446_state *st, unsigned val)
|
|
{
|
|
st->data.d16 = cpu_to_be16(AD5446_LOAD |
|
|
(val << st->chip_info->left_shift));
|
|
}
|
|
|
|
static void ad5542_store_sample(struct ad5446_state *st, unsigned val)
|
|
{
|
|
st->data.d16 = cpu_to_be16(val << st->chip_info->left_shift);
|
|
}
|
|
|
|
static void ad5620_store_sample(struct ad5446_state *st, unsigned val)
|
|
{
|
|
st->data.d16 = cpu_to_be16(AD5620_LOAD |
|
|
(val << st->chip_info->left_shift));
|
|
}
|
|
|
|
static void ad5660_store_sample(struct ad5446_state *st, unsigned val)
|
|
{
|
|
val |= AD5660_LOAD;
|
|
st->data.d24[0] = (val >> 16) & 0xFF;
|
|
st->data.d24[1] = (val >> 8) & 0xFF;
|
|
st->data.d24[2] = val & 0xFF;
|
|
}
|
|
|
|
static void ad5620_store_pwr_down(struct ad5446_state *st, unsigned mode)
|
|
{
|
|
st->data.d16 = cpu_to_be16(mode << 14);
|
|
}
|
|
|
|
static void ad5660_store_pwr_down(struct ad5446_state *st, unsigned mode)
|
|
{
|
|
unsigned val = mode << 16;
|
|
|
|
st->data.d24[0] = (val >> 16) & 0xFF;
|
|
st->data.d24[1] = (val >> 8) & 0xFF;
|
|
st->data.d24[2] = val & 0xFF;
|
|
}
|
|
|
|
static ssize_t ad5446_write(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad5446_state *st = iio_priv(dev_info);
|
|
int ret;
|
|
long val;
|
|
|
|
ret = strict_strtol(buf, 10, &val);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
if (val > RES_MASK(st->chip_info->bits)) {
|
|
ret = -EINVAL;
|
|
goto error_ret;
|
|
}
|
|
|
|
mutex_lock(&dev_info->mlock);
|
|
st->cached_val = val;
|
|
st->chip_info->store_sample(st, val);
|
|
ret = spi_sync(st->spi, &st->msg);
|
|
mutex_unlock(&dev_info->mlock);
|
|
|
|
error_ret:
|
|
return ret ? ret : len;
|
|
}
|
|
|
|
static IIO_DEV_ATTR_OUT_RAW(0, ad5446_write, 0);
|
|
|
|
static ssize_t ad5446_show_scale(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad5446_state *st = iio_priv(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, ad5446_show_scale, NULL, 0);
|
|
|
|
static ssize_t ad5446_write_powerdown_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad5446_state *st = iio_priv(dev_info);
|
|
|
|
if (sysfs_streq(buf, "1kohm_to_gnd"))
|
|
st->pwr_down_mode = MODE_PWRDWN_1k;
|
|
else if (sysfs_streq(buf, "100kohm_to_gnd"))
|
|
st->pwr_down_mode = MODE_PWRDWN_100k;
|
|
else if (sysfs_streq(buf, "three_state"))
|
|
st->pwr_down_mode = MODE_PWRDWN_TRISTATE;
|
|
else
|
|
return -EINVAL;
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t ad5446_read_powerdown_mode(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad5446_state *st = iio_priv(dev_info);
|
|
|
|
char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
|
|
|
|
return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
|
|
}
|
|
|
|
static ssize_t ad5446_read_dac_powerdown(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad5446_state *st = iio_priv(dev_info);
|
|
|
|
return sprintf(buf, "%d\n", st->pwr_down);
|
|
}
|
|
|
|
static ssize_t ad5446_write_dac_powerdown(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad5446_state *st = iio_priv(dev_info);
|
|
unsigned long readin;
|
|
int ret;
|
|
|
|
ret = strict_strtol(buf, 10, &readin);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (readin > 1)
|
|
ret = -EINVAL;
|
|
|
|
mutex_lock(&dev_info->mlock);
|
|
st->pwr_down = readin;
|
|
|
|
if (st->pwr_down)
|
|
st->chip_info->store_pwr_down(st, st->pwr_down_mode);
|
|
else
|
|
st->chip_info->store_sample(st, st->cached_val);
|
|
|
|
ret = spi_sync(st->spi, &st->msg);
|
|
mutex_unlock(&dev_info->mlock);
|
|
|
|
return ret ? ret : len;
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO | S_IWUSR,
|
|
ad5446_read_powerdown_mode,
|
|
ad5446_write_powerdown_mode, 0);
|
|
|
|
static IIO_CONST_ATTR(out_powerdown_mode_available,
|
|
"1kohm_to_gnd 100kohm_to_gnd three_state");
|
|
|
|
static IIO_DEVICE_ATTR(out0_powerdown, S_IRUGO | S_IWUSR,
|
|
ad5446_read_dac_powerdown,
|
|
ad5446_write_dac_powerdown, 0);
|
|
|
|
static struct attribute *ad5446_attributes[] = {
|
|
&iio_dev_attr_out0_raw.dev_attr.attr,
|
|
&iio_dev_attr_out_scale.dev_attr.attr,
|
|
&iio_dev_attr_out0_powerdown.dev_attr.attr,
|
|
&iio_dev_attr_out_powerdown_mode.dev_attr.attr,
|
|
&iio_const_attr_out_powerdown_mode_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static mode_t ad5446_attr_is_visible(struct kobject *kobj,
|
|
struct attribute *attr, int n)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad5446_state *st = iio_priv(dev_info);
|
|
|
|
mode_t mode = attr->mode;
|
|
|
|
if (!st->chip_info->store_pwr_down &&
|
|
(attr == &iio_dev_attr_out0_powerdown.dev_attr.attr ||
|
|
attr == &iio_dev_attr_out_powerdown_mode.dev_attr.attr ||
|
|
attr ==
|
|
&iio_const_attr_out_powerdown_mode_available.dev_attr.attr))
|
|
mode = 0;
|
|
|
|
return mode;
|
|
}
|
|
|
|
static const struct attribute_group ad5446_attribute_group = {
|
|
.attrs = ad5446_attributes,
|
|
.is_visible = ad5446_attr_is_visible,
|
|
};
|
|
|
|
static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
|
|
[ID_AD5444] = {
|
|
.bits = 12,
|
|
.storagebits = 16,
|
|
.left_shift = 2,
|
|
.store_sample = ad5446_store_sample,
|
|
},
|
|
[ID_AD5446] = {
|
|
.bits = 14,
|
|
.storagebits = 16,
|
|
.left_shift = 0,
|
|
.store_sample = ad5446_store_sample,
|
|
},
|
|
[ID_AD5541A] = {
|
|
.bits = 16,
|
|
.storagebits = 16,
|
|
.left_shift = 0,
|
|
.store_sample = ad5542_store_sample,
|
|
},
|
|
[ID_AD5542A] = {
|
|
.bits = 16,
|
|
.storagebits = 16,
|
|
.left_shift = 0,
|
|
.store_sample = ad5542_store_sample,
|
|
},
|
|
[ID_AD5543] = {
|
|
.bits = 16,
|
|
.storagebits = 16,
|
|
.left_shift = 0,
|
|
.store_sample = ad5542_store_sample,
|
|
},
|
|
[ID_AD5512A] = {
|
|
.bits = 12,
|
|
.storagebits = 16,
|
|
.left_shift = 4,
|
|
.store_sample = ad5542_store_sample,
|
|
},
|
|
[ID_AD5553] = {
|
|
.bits = 14,
|
|
.storagebits = 16,
|
|
.left_shift = 0,
|
|
.store_sample = ad5542_store_sample,
|
|
},
|
|
[ID_AD5601] = {
|
|
.bits = 8,
|
|
.storagebits = 16,
|
|
.left_shift = 6,
|
|
.store_sample = ad5542_store_sample,
|
|
.store_pwr_down = ad5620_store_pwr_down,
|
|
},
|
|
[ID_AD5611] = {
|
|
.bits = 10,
|
|
.storagebits = 16,
|
|
.left_shift = 4,
|
|
.store_sample = ad5542_store_sample,
|
|
.store_pwr_down = ad5620_store_pwr_down,
|
|
},
|
|
[ID_AD5621] = {
|
|
.bits = 12,
|
|
.storagebits = 16,
|
|
.left_shift = 2,
|
|
.store_sample = ad5542_store_sample,
|
|
.store_pwr_down = ad5620_store_pwr_down,
|
|
},
|
|
[ID_AD5620_2500] = {
|
|
.bits = 12,
|
|
.storagebits = 16,
|
|
.left_shift = 2,
|
|
.int_vref_mv = 2500,
|
|
.store_sample = ad5620_store_sample,
|
|
.store_pwr_down = ad5620_store_pwr_down,
|
|
},
|
|
[ID_AD5620_1250] = {
|
|
.bits = 12,
|
|
.storagebits = 16,
|
|
.left_shift = 2,
|
|
.int_vref_mv = 1250,
|
|
.store_sample = ad5620_store_sample,
|
|
.store_pwr_down = ad5620_store_pwr_down,
|
|
},
|
|
[ID_AD5640_2500] = {
|
|
.bits = 14,
|
|
.storagebits = 16,
|
|
.left_shift = 0,
|
|
.int_vref_mv = 2500,
|
|
.store_sample = ad5620_store_sample,
|
|
.store_pwr_down = ad5620_store_pwr_down,
|
|
},
|
|
[ID_AD5640_1250] = {
|
|
.bits = 14,
|
|
.storagebits = 16,
|
|
.left_shift = 0,
|
|
.int_vref_mv = 1250,
|
|
.store_sample = ad5620_store_sample,
|
|
.store_pwr_down = ad5620_store_pwr_down,
|
|
},
|
|
[ID_AD5660_2500] = {
|
|
.bits = 16,
|
|
.storagebits = 24,
|
|
.left_shift = 0,
|
|
.int_vref_mv = 2500,
|
|
.store_sample = ad5660_store_sample,
|
|
.store_pwr_down = ad5660_store_pwr_down,
|
|
},
|
|
[ID_AD5660_1250] = {
|
|
.bits = 16,
|
|
.storagebits = 24,
|
|
.left_shift = 0,
|
|
.int_vref_mv = 1250,
|
|
.store_sample = ad5660_store_sample,
|
|
.store_pwr_down = ad5660_store_pwr_down,
|
|
},
|
|
};
|
|
|
|
static const struct iio_info ad5446_info = {
|
|
.attrs = &ad5446_attribute_group,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static int __devinit ad5446_probe(struct spi_device *spi)
|
|
{
|
|
struct ad5446_state *st;
|
|
struct iio_dev *indio_dev;
|
|
struct regulator *reg;
|
|
int ret, voltage_uv = 0;
|
|
|
|
reg = regulator_get(&spi->dev, "vcc");
|
|
if (!IS_ERR(reg)) {
|
|
ret = regulator_enable(reg);
|
|
if (ret)
|
|
goto error_put_reg;
|
|
|
|
voltage_uv = regulator_get_voltage(reg);
|
|
}
|
|
|
|
indio_dev = iio_allocate_device(sizeof(*st));
|
|
if (indio_dev == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_disable_reg;
|
|
}
|
|
st = iio_priv(indio_dev);
|
|
st->chip_info =
|
|
&ad5446_chip_info_tbl[spi_get_device_id(spi)->driver_data];
|
|
|
|
spi_set_drvdata(spi, indio_dev);
|
|
st->reg = reg;
|
|
st->spi = spi;
|
|
|
|
/* Estabilish that the iio_dev is a child of the spi device */
|
|
indio_dev->dev.parent = &spi->dev;
|
|
indio_dev->name = spi_get_device_id(spi)->name;
|
|
indio_dev->info = &ad5446_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
/* Setup default message */
|
|
|
|
st->xfer.tx_buf = &st->data;
|
|
st->xfer.len = st->chip_info->storagebits / 8;
|
|
|
|
spi_message_init(&st->msg);
|
|
spi_message_add_tail(&st->xfer, &st->msg);
|
|
|
|
switch (spi_get_device_id(spi)->driver_data) {
|
|
case ID_AD5620_2500:
|
|
case ID_AD5620_1250:
|
|
case ID_AD5640_2500:
|
|
case ID_AD5640_1250:
|
|
case ID_AD5660_2500:
|
|
case ID_AD5660_1250:
|
|
st->vref_mv = st->chip_info->int_vref_mv;
|
|
break;
|
|
default:
|
|
if (voltage_uv)
|
|
st->vref_mv = voltage_uv / 1000;
|
|
else
|
|
dev_warn(&spi->dev,
|
|
"reference voltage unspecified\n");
|
|
}
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto error_free_device;
|
|
|
|
return 0;
|
|
|
|
error_free_device:
|
|
iio_free_device(indio_dev);
|
|
error_disable_reg:
|
|
if (!IS_ERR(reg))
|
|
regulator_disable(reg);
|
|
error_put_reg:
|
|
if (!IS_ERR(reg))
|
|
regulator_put(reg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ad5446_remove(struct spi_device *spi)
|
|
{
|
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
|
struct ad5446_state *st = iio_priv(indio_dev);
|
|
struct regulator *reg = st->reg;
|
|
|
|
iio_device_unregister(indio_dev);
|
|
if (!IS_ERR(reg)) {
|
|
regulator_disable(reg);
|
|
regulator_put(reg);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct spi_device_id ad5446_id[] = {
|
|
{"ad5444", ID_AD5444},
|
|
{"ad5446", ID_AD5446},
|
|
{"ad5512a", ID_AD5512A},
|
|
{"ad5541a", ID_AD5541A},
|
|
{"ad5542a", ID_AD5542A},
|
|
{"ad5543", ID_AD5543},
|
|
{"ad5553", ID_AD5553},
|
|
{"ad5601", ID_AD5601},
|
|
{"ad5611", ID_AD5611},
|
|
{"ad5621", ID_AD5621},
|
|
{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
|
|
{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
|
|
{"ad5640-2500", ID_AD5640_2500},
|
|
{"ad5640-1250", ID_AD5640_1250},
|
|
{"ad5660-2500", ID_AD5660_2500},
|
|
{"ad5660-1250", ID_AD5660_1250},
|
|
{}
|
|
};
|
|
|
|
static struct spi_driver ad5446_driver = {
|
|
.driver = {
|
|
.name = "ad5446",
|
|
.bus = &spi_bus_type,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ad5446_probe,
|
|
.remove = __devexit_p(ad5446_remove),
|
|
.id_table = ad5446_id,
|
|
};
|
|
|
|
static int __init ad5446_init(void)
|
|
{
|
|
return spi_register_driver(&ad5446_driver);
|
|
}
|
|
module_init(ad5446_init);
|
|
|
|
static void __exit ad5446_exit(void)
|
|
{
|
|
spi_unregister_driver(&ad5446_driver);
|
|
}
|
|
module_exit(ad5446_exit);
|
|
|
|
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
|
MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("spi:ad5446");
|