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/*
* Driver for ADI Direct Digital Synthesis ad9852
*
* 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 "../iio.h"
#include "../sysfs.h"
#define DRV_NAME "ad9852"
#define addr_phaad1 0x0
#define addr_phaad2 0x1
#define addr_fretu1 0x2
#define addr_fretu2 0x3
#define addr_delfre 0x4
#define addr_updclk 0x5
#define addr_ramclk 0x6
#define addr_contrl 0x7
#define addr_optskm 0x8
#define addr_optskr 0xa
#define addr_dacctl 0xb
#define COMPPD (1 << 4)
#define REFMULT2 (1 << 2)
#define BYPPLL (1 << 5)
#define PLLRANG (1 << 6)
#define IEUPCLK (1)
#define OSKEN (1 << 5)
#define read_bit (1 << 7)
/* Register format: 1 byte addr + value */
struct ad9852_config {
u8 phajst0[3];
u8 phajst1[3];
u8 fretun1[6];
u8 fretun2[6];
u8 dltafre[6];
u8 updtclk[5];
u8 ramprat[4];
u8 control[5];
u8 outpskm[3];
u8 outpskr[2];
u8 daccntl[3];
};
struct ad9852_state {
struct mutex lock;
struct spi_device *sdev;
};
static ssize_t ad9852_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 ad9852_config *config = (struct ad9852_config *)buf;
struct iio_dev *idev = dev_get_drvdata(dev);
struct ad9852_state *st = iio_priv(idev);
xfer.len = 3;
xfer.tx_buf = &config->phajst0[0];
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;
xfer.len = 3;
xfer.tx_buf = &config->phajst1[0];
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
xfer.len = 6;
xfer.tx_buf = &config->fretun1[0];
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
xfer.len = 6;
xfer.tx_buf = &config->fretun2[0];
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
xfer.len = 6;
xfer.tx_buf = &config->dltafre[0];
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
xfer.len = 5;
xfer.tx_buf = &config->updtclk[0];
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
xfer.len = 4;
xfer.tx_buf = &config->ramprat[0];
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
xfer.len = 5;
xfer.tx_buf = &config->control[0];
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
xfer.len = 3;
xfer.tx_buf = &config->outpskm[0];
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
xfer.len = 2;
xfer.tx_buf = &config->outpskr[0];
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(st->sdev, &msg);
if (ret)
goto error_ret;
xfer.len = 3;
xfer.tx_buf = &config->daccntl[0];
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, ad9852_set_parameter, 0);
static void ad9852_init(struct ad9852_state *st)
{
struct spi_message msg;
struct spi_transfer xfer;
int ret;
u8 config[5];
config[0] = addr_contrl;
config[1] = COMPPD;
config[2] = REFMULT2 | BYPPLL | PLLRANG;
config[3] = IEUPCLK;
config[4] = OSKEN;
mutex_lock(&st->lock);
xfer.len = 5;
xfer.tx_buf = &config;
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);
}
static struct attribute *ad9852_attributes[] = {
&iio_dev_attr_dds.dev_attr.attr,
NULL,
};
static const struct attribute_group ad9852_attribute_group = {
.attrs = ad9852_attributes,
};
static const struct iio_info ad9852_info = {
.attrs = &ad9852_attribute_group,
.driver_module = THIS_MODULE,
};
static int __devinit ad9852_probe(struct spi_device *spi)
{
struct ad9852_state *st;
struct iio_dev *idev;
int ret = 0;
idev = iio_allocate_device(sizeof(*st));
if (idev == NULL) {
ret = -ENOMEM;
goto error_ret;
}
st = iio_priv(idev);
spi_set_drvdata(spi, idev);
mutex_init(&st->lock);
st->sdev = spi;
idev->dev.parent = &spi->dev;
idev->info = &ad9852_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 = 8;
spi_setup(spi);
ad9852_init(st);
return 0;
error_free_dev:
iio_free_device(idev);
error_ret:
return ret;
}
static int __devexit ad9852_remove(struct spi_device *spi)
{
iio_device_unregister(spi_get_drvdata(spi));
return 0;
}
static struct spi_driver ad9852_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
.probe = ad9852_probe,
.remove = __devexit_p(ad9852_remove),
};
static __init int ad9852_spi_init(void)
{
return spi_register_driver(&ad9852_driver);
}
module_init(ad9852_spi_init);
static __exit void ad9852_spi_exit(void)
{
spi_unregister_driver(&ad9852_driver);
}
module_exit(ad9852_spi_exit);
MODULE_AUTHOR("Cliff Cai");
MODULE_DESCRIPTION("Analog Devices ad9852 driver");
MODULE_LICENSE("GPL v2");
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