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/*
* Driver for ADI Direct Digital Synthesis ad5930
*
* Copyright (c) 2010-2010 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 "ad5930"
#define value_mask (u16)0xf000
#define addr_shift 12
/* Register format: 4 bits addr + 12 bits value */
struct ad5903_config {
u16 control;
u16 incnum;
u16 frqdelt[2];
u16 incitvl;
u16 buritvl;
u16 strtfrq[2];
};
struct ad5930_state {
struct mutex lock;
struct spi_device *sdev;
};
static ssize_t ad5930_set_parameter(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct spi_message msg;
struct spi_transfer xfer;
int ret;
struct ad5903_config *config = (struct ad5903_config *)buf;
struct iio_dev *idev = dev_to_iio_dev(dev);
struct ad5930_state *st = iio_priv(idev);
config->control = (config->control & ~value_mask);
config->incnum = (config->control & ~value_mask) | (1 << addr_shift);
config->frqdelt[0] = (config->control & ~value_mask) | (2 << addr_shift);
config->frqdelt[1] = (config->control & ~value_mask) | 3 << addr_shift;
config->incitvl = (config->control & ~value_mask) | 4 << addr_shift;
config->buritvl = (config->control & ~value_mask) | 8 << addr_shift;
config->strtfrq[0] = (config->control & ~value_mask) | 0xc << addr_shift;
config->strtfrq[1] = (config->control & ~value_mask) | 0xd << addr_shift;
xfer.len = len;
xfer.tx_buf = config;
mutex_lock(&st->lock);
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
error_ret:
mutex_unlock(&st->lock);
return ret ? ret : len;
}
static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad5930_set_parameter, 0);
static struct attribute *ad5930_attributes[] = {
&iio_dev_attr_dds.dev_attr.attr,
NULL,
};
static const struct attribute_group ad5930_attribute_group = {
.attrs = ad5930_attributes,
};
static const struct iio_info ad5930_info = {
.attrs = &ad5930_attribute_group,
.driver_module = THIS_MODULE,
};
static int __devinit ad5930_probe(struct spi_device *spi)
{
struct ad5930_state *st;
struct iio_dev *idev;
int ret = 0;
idev = iio_device_alloc(sizeof(*st));
if (idev == NULL) {
ret = -ENOMEM;
goto error_ret;
}
spi_set_drvdata(spi, idev);
st = iio_priv(idev);
mutex_init(&st->lock);
st->sdev = spi;
idev->dev.parent = &spi->dev;
idev->info = &ad5930_info;
idev->modes = INDIO_DIRECT_MODE;
ret = iio_device_register(idev);
if (ret)
goto error_free_dev;
spi->max_speed_hz = 2000000;
spi->mode = SPI_MODE_3;
spi->bits_per_word = 16;
spi_setup(spi);
return 0;
error_free_dev:
iio_device_free(idev);
error_ret:
return ret;
}
static int __devexit ad5930_remove(struct spi_device *spi)
{
iio_device_unregister(spi_get_drvdata(spi));
iio_device_free(spi_get_drvdata(spi));
return 0;
}
static struct spi_driver ad5930_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.probe = ad5930_probe,
.remove = __devexit_p(ad5930_remove),
};
module_spi_driver(ad5930_driver);
MODULE_AUTHOR("Cliff Cai");
MODULE_DESCRIPTION("Analog Devices ad5930 driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:" DRV_NAME);
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