![Bill Pemberton](/assets/img/avatar_default.png)
CONFIG_HOTPLUG is going away as an option so __devexit_p is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
233 lines
4.4 KiB
C
233 lines
4.4 KiB
C
/*
|
|
* 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_message msg;
|
|
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);
|
|
|
|
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->arr[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->ftw0[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->ftw1[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, ad9951_set_parameter, 0);
|
|
|
|
static void ad9951_init(struct ad9951_state *st)
|
|
{
|
|
struct spi_message msg;
|
|
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
|
|
|
|
spi_message_init(&msg);
|
|
spi_message_add_tail(&xfer, &msg);
|
|
ret = spi_sync(st->sdev, &msg);
|
|
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
|
|
|
|
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 *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 = 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 = &ad9951_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);
|
|
ad9951_init(st);
|
|
return 0;
|
|
|
|
error_free_dev:
|
|
iio_device_free(idev);
|
|
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static int ad9951_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 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);
|