mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 09:46:43 +07:00
staging: iio: dac: Enable driver support for AD5444 and AD5446 DA converters
Enable support for AD5444 and AD5446: 12-/14-Bit High Bandwidth Multiplying DACs with Serial Interface. staging: iio: dac: Add support for AD5541A, AD5512A digital to analog convertors staging: iio: dac: Fix according to review feedback Review feedback by Jonathan Cameron: Remove spurious new line. Document struct members. Remove redundant variable initialization. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich
Greg Kroah-Hartman
parent
95bd48578b
commit
b5a4948175
@ -9,3 +9,13 @@ config AD5624R_SPI
|
||||
help
|
||||
Say yes here to build support for Analog Devices AD5624R, AD5644R and
|
||||
AD5664R convertors (DAC). This driver uses the common SPI interface.
|
||||
|
||||
config AD5446
|
||||
tristate "Analog Devices AD5444, AD5446 and AD5541A, AD5512A DAC SPI driver"
|
||||
depends on SPI
|
||||
help
|
||||
Say yes here to build support for Analog Devices AD5444, AD5446
|
||||
and AD5541A, AD5512A DACs.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called ad5446.
|
||||
|
||||
@ -3,3 +3,4 @@
|
||||
#
|
||||
|
||||
obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
|
||||
obj-$(CONFIG_AD5446) += ad5446.o
|
||||
|
||||
249
drivers/staging/iio/dac/ad5446.c
Normal file
249
drivers/staging/iio/dac/ad5446.c
Normal file
@ -0,0 +1,249 @@
|
||||
/*
|
||||
* 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 "../iio.h"
|
||||
#include "../sysfs.h"
|
||||
#include "dac.h"
|
||||
|
||||
#include "ad5446.h"
|
||||
|
||||
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 = dev_info->dev_data;
|
||||
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);
|
||||
switch (spi_get_device_id(st->spi)->driver_data) {
|
||||
case ID_AD5444:
|
||||
case ID_AD5446:
|
||||
st->data = cpu_to_be16(AD5446_LOAD |
|
||||
(val << st->chip_info->left_shift));
|
||||
break;
|
||||
case ID_AD5542A:
|
||||
case ID_AD5512A:
|
||||
st->data = cpu_to_be16(val << st->chip_info->left_shift);
|
||||
break;
|
||||
}
|
||||
|
||||
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_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.%d\n", scale_uv / 1000, scale_uv % 1000);
|
||||
}
|
||||
static IIO_DEVICE_ATTR(out_scale, S_IRUGO, ad5446_show_scale, NULL, 0);
|
||||
|
||||
static ssize_t ad5446_show_name(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
||||
struct ad5446_state *st = iio_dev_get_devdata(dev_info);
|
||||
|
||||
return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name);
|
||||
}
|
||||
static IIO_DEVICE_ATTR(name, S_IRUGO, ad5446_show_name, NULL, 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_name.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group ad5446_attribute_group = {
|
||||
.attrs = ad5446_attributes,
|
||||
};
|
||||
|
||||
static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
|
||||
[ID_AD5444] = {
|
||||
.bits = 12,
|
||||
.storagebits = 16,
|
||||
.left_shift = 2,
|
||||
.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
|
||||
},
|
||||
[ID_AD5446] = {
|
||||
.bits = 14,
|
||||
.storagebits = 16,
|
||||
.left_shift = 0,
|
||||
.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
|
||||
},
|
||||
[ID_AD5542A] = {
|
||||
.bits = 16,
|
||||
.storagebits = 16,
|
||||
.left_shift = 0,
|
||||
.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
|
||||
},
|
||||
[ID_AD5512A] = {
|
||||
.bits = 12,
|
||||
.storagebits = 16,
|
||||
.left_shift = 4,
|
||||
.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
|
||||
},
|
||||
};
|
||||
|
||||
static int __devinit ad5446_probe(struct spi_device *spi)
|
||||
{
|
||||
struct ad5446_state *st;
|
||||
int ret, voltage_uv = 0;
|
||||
|
||||
st = kzalloc(sizeof(*st), GFP_KERNEL);
|
||||
if (st == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto error_ret;
|
||||
}
|
||||
|
||||
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 =
|
||||
&ad5446_chip_info_tbl[spi_get_device_id(spi)->driver_data];
|
||||
|
||||
spi_set_drvdata(spi, st);
|
||||
|
||||
st->spi = spi;
|
||||
|
||||
st->indio_dev = iio_allocate_device();
|
||||
if (st->indio_dev == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto error_disable_reg;
|
||||
}
|
||||
|
||||
/* Estabilish that the iio_dev is a child of the spi device */
|
||||
st->indio_dev->dev.parent = &spi->dev;
|
||||
st->indio_dev->attrs = &ad5446_attribute_group;
|
||||
st->indio_dev->dev_data = (void *)(st);
|
||||
st->indio_dev->driver_module = THIS_MODULE;
|
||||
st->indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
|
||||
/* Setup default message */
|
||||
|
||||
st->xfer.tx_buf = &st->data,
|
||||
st->xfer.len = 2,
|
||||
|
||||
spi_message_init(&st->msg);
|
||||
spi_message_add_tail(&st->xfer, &st->msg);
|
||||
|
||||
if (voltage_uv)
|
||||
st->vref_mv = voltage_uv / 1000;
|
||||
else
|
||||
dev_warn(&spi->dev, "reference voltage unspecified\n");
|
||||
|
||||
ret = iio_device_register(st->indio_dev);
|
||||
if (ret)
|
||||
goto error_free_device;
|
||||
|
||||
return 0;
|
||||
|
||||
error_free_device:
|
||||
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 ad5446_remove(struct spi_device *spi)
|
||||
{
|
||||
struct ad5446_state *st = spi_get_drvdata(spi);
|
||||
struct iio_dev *indio_dev = st->indio_dev;
|
||||
|
||||
iio_device_unregister(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 ad5446_id[] = {
|
||||
{"ad5444", ID_AD5444},
|
||||
{"ad5446", ID_AD5446},
|
||||
{"ad5542a", ID_AD5542A},
|
||||
{"ad5512a", ID_AD5512A},
|
||||
{}
|
||||
};
|
||||
|
||||
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");
|
||||
46
drivers/staging/iio/dac/ad5446.h
Normal file
46
drivers/staging/iio/dac/ad5446.h
Normal file
@ -0,0 +1,46 @@
|
||||
/*
|
||||
* AD5446 SPI DAC driver
|
||||
*
|
||||
* Copyright 2010 Analog Devices Inc.
|
||||
*
|
||||
* Licensed under the GPL-2 or later.
|
||||
*/
|
||||
#ifndef IIO_ADC_AD5446_H_
|
||||
#define IIO_ADC_AD5446_H_
|
||||
|
||||
/* DAC Control Bits */
|
||||
|
||||
#define AD5446_LOAD (0x0 << 14) /* Load and update */
|
||||
#define AD5446_SDO_DIS (0x1 << 14) /* Disable SDO */
|
||||
#define AD5446_NOP (0x2 << 14) /* No operation */
|
||||
#define AD5446_CLK_RISING (0x3 << 14) /* Clock data on rising edge */
|
||||
|
||||
#define RES_MASK(bits) ((1 << (bits)) - 1)
|
||||
|
||||
struct ad5446_chip_info {
|
||||
u8 bits; /* number of DAC bits */
|
||||
u8 storagebits; /* number of bits written to the DAC */
|
||||
u8 left_shift; /* number of bits the datum must be shifted */
|
||||
char sign; /* [s]igned or [u]nsigned */
|
||||
};
|
||||
|
||||
struct ad5446_state {
|
||||
struct iio_dev *indio_dev;
|
||||
struct spi_device *spi;
|
||||
const struct ad5446_chip_info *chip_info;
|
||||
struct regulator *reg;
|
||||
struct work_struct poll_work;
|
||||
unsigned short vref_mv;
|
||||
struct spi_transfer xfer;
|
||||
struct spi_message msg;
|
||||
unsigned short data;
|
||||
};
|
||||
|
||||
enum ad5446_supported_device_ids {
|
||||
ID_AD5444,
|
||||
ID_AD5446,
|
||||
ID_AD5542A,
|
||||
ID_AD5512A,
|
||||
};
|
||||
|
||||
#endif /* IIO_ADC_AD5446_H_ */
|
||||
Loading…
Reference in New Issue
Block a user