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/*
* Driver for ADI Direct Digital Synthesis ad9951
*
* Copyright (c) 2010 Analog Devices Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#define DRV_NAME "ad9951"
#define CFR1 0x0
#define CFR2 0x1
#define AUTO_OSK (1)
#define OSKEN (1 << 1)
#define LOAD_ARR (1 << 2)
#define AUTO_SYNC (1 << 7)
#define LSB_FST (1)
#define SDIO_IPT (1 << 1)
#define CLR_PHA (1 << 2)
#define SINE_OPT (1 << 4)
#define ACLR_PHA (1 << 5)
#define VCO_RANGE (1 << 2)
#define CRS_OPT (1 << 1)
#define HMANU_SYNC (1 << 2)
#define HSPD_SYNC (1 << 3)
/* Register format: 1 byte addr + value */
struct ad9951_config {
u8 asf[3];
u8 arr[2];
u8 ftw0[5];
u8 ftw1[3];
};
struct ad9951_state {
struct mutex lock;
struct spi_device *sdev;
};
static ssize_t ad9951_set_parameter(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct spi_transfer xfer;
int ret;
struct ad9951_config *config = (struct ad9951_config *)buf;
struct iio_dev *idev = dev_to_iio_dev(dev);
struct ad9951_state *st = iio_priv(idev);
xfer.len = 3;
xfer.tx_buf = &config->asf[0];
mutex_lock(&st->lock);
ret = spi_sync_transfer(st->sdev, &xfer, 1);
if (ret)
goto error_ret;
xfer.len = 2;
xfer.tx_buf = &config->arr[0];
ret = spi_sync_transfer(st->sdev, &xfer, 1);
if (ret)
goto error_ret;
xfer.len = 5;
xfer.tx_buf = &config->ftw0[0];
ret = spi_sync_transfer(st->sdev, &xfer, 1);
if (ret)
goto error_ret;
xfer.len = 3;
xfer.tx_buf = &config->ftw1[0];
ret = spi_sync_transfer(st->sdev, &xfer, 1);
if (ret)
goto error_ret;
error_ret:
mutex_unlock(&st->lock);
return ret ? ret : len;
}
static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9951_set_parameter, 0);
static void ad9951_init(struct ad9951_state *st)
{
struct spi_transfer xfer;
int ret;
u8 cfr[5];
cfr[0] = CFR1;
cfr[1] = 0;
cfr[2] = LSB_FST | CLR_PHA | SINE_OPT | ACLR_PHA;
cfr[3] = AUTO_OSK | OSKEN | LOAD_ARR;
cfr[4] = 0;
mutex_lock(&st->lock);
xfer.len = 5;
xfer.tx_buf = 𝔠
ret = spi_sync_transfer(st->sdev, &xfer, 1);
if (ret)
goto error_ret;
cfr[0] = CFR2;
cfr[1] = VCO_RANGE;
cfr[2] = HSPD_SYNC;
cfr[3] = 0;
xfer.len = 4;
xfer.tx_buf = 𝔠
ret = spi_sync_transfer(st->sdev, &xfer, 1);
if (ret)
goto error_ret;
error_ret:
mutex_unlock(&st->lock);
}
static struct attribute *ad9951_attributes[] = {
&iio_dev_attr_dds.dev_attr.attr,
NULL,
};
static const struct attribute_group ad9951_attribute_group = {
.attrs = ad9951_attributes,
};
static const struct iio_info ad9951_info = {
.attrs = &ad9951_attribute_group,
.driver_module = THIS_MODULE,
};
static int ad9951_probe(struct spi_device *spi)
{
struct ad9951_state *st;
struct iio_dev *idev;
int ret = 0;
idev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!idev)
return -ENOMEM;
spi_set_drvdata(spi, idev);
st = iio_priv(idev);
mutex_init(&st->lock);
st->sdev = spi;
idev->dev.parent = &spi->dev;
idev->info = &ad9951_info;
idev->modes = INDIO_DIRECT_MODE;
ret = iio_device_register(idev);
if (ret)
return ret;
spi->max_speed_hz = 2000000;
spi->mode = SPI_MODE_3;
spi->bits_per_word = 8;
spi_setup(spi);
ad9951_init(st);
return 0;
}
static int ad9951_remove(struct spi_device *spi)
{
iio_device_unregister(spi_get_drvdata(spi));
return 0;
}
static struct spi_driver ad9951_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.probe = ad9951_probe,
.remove = ad9951_remove,
};
module_spi_driver(ad9951_driver);
MODULE_AUTHOR("Cliff Cai");
MODULE_DESCRIPTION("Analog Devices ad9951 driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:" DRV_NAME);
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