![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>
465 lines
12 KiB
C
465 lines
12 KiB
C
/*
|
|
* AD9833/AD9834/AD9837/AD9838 SPI DDS driver
|
|
*
|
|
* Copyright 2010-2011 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2.
|
|
*/
|
|
|
|
#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 <linux/module.h>
|
|
#include <asm/div64.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/sysfs.h>
|
|
#include "dds.h"
|
|
|
|
#include "ad9834.h"
|
|
|
|
static unsigned int ad9834_calc_freqreg(unsigned long mclk, unsigned long fout)
|
|
{
|
|
unsigned long long freqreg = (u64) fout * (u64) (1 << AD9834_FREQ_BITS);
|
|
do_div(freqreg, mclk);
|
|
return freqreg;
|
|
}
|
|
|
|
static int ad9834_write_frequency(struct ad9834_state *st,
|
|
unsigned long addr, unsigned long fout)
|
|
{
|
|
unsigned long regval;
|
|
|
|
if (fout > (st->mclk / 2))
|
|
return -EINVAL;
|
|
|
|
regval = ad9834_calc_freqreg(st->mclk, fout);
|
|
|
|
st->freq_data[0] = cpu_to_be16(addr | (regval &
|
|
RES_MASK(AD9834_FREQ_BITS / 2)));
|
|
st->freq_data[1] = cpu_to_be16(addr | ((regval >>
|
|
(AD9834_FREQ_BITS / 2)) &
|
|
RES_MASK(AD9834_FREQ_BITS / 2)));
|
|
|
|
return spi_sync(st->spi, &st->freq_msg);
|
|
}
|
|
|
|
static int ad9834_write_phase(struct ad9834_state *st,
|
|
unsigned long addr, unsigned long phase)
|
|
{
|
|
if (phase > (1 << AD9834_PHASE_BITS))
|
|
return -EINVAL;
|
|
st->data = cpu_to_be16(addr | phase);
|
|
|
|
return spi_sync(st->spi, &st->msg);
|
|
}
|
|
|
|
static ssize_t ad9834_write(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct ad9834_state *st = iio_priv(indio_dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int ret;
|
|
long val;
|
|
|
|
ret = strict_strtoul(buf, 10, &val);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
mutex_lock(&indio_dev->mlock);
|
|
switch ((u32) this_attr->address) {
|
|
case AD9834_REG_FREQ0:
|
|
case AD9834_REG_FREQ1:
|
|
ret = ad9834_write_frequency(st, this_attr->address, val);
|
|
break;
|
|
case AD9834_REG_PHASE0:
|
|
case AD9834_REG_PHASE1:
|
|
ret = ad9834_write_phase(st, this_attr->address, val);
|
|
break;
|
|
case AD9834_OPBITEN:
|
|
if (st->control & AD9834_MODE) {
|
|
ret = -EINVAL; /* AD9843 reserved mode */
|
|
break;
|
|
}
|
|
|
|
if (val)
|
|
st->control |= AD9834_OPBITEN;
|
|
else
|
|
st->control &= ~AD9834_OPBITEN;
|
|
|
|
st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
|
|
ret = spi_sync(st->spi, &st->msg);
|
|
break;
|
|
case AD9834_PIN_SW:
|
|
if (val)
|
|
st->control |= AD9834_PIN_SW;
|
|
else
|
|
st->control &= ~AD9834_PIN_SW;
|
|
st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
|
|
ret = spi_sync(st->spi, &st->msg);
|
|
break;
|
|
case AD9834_FSEL:
|
|
case AD9834_PSEL:
|
|
if (val == 0)
|
|
st->control &= ~(this_attr->address | AD9834_PIN_SW);
|
|
else if (val == 1) {
|
|
st->control |= this_attr->address;
|
|
st->control &= ~AD9834_PIN_SW;
|
|
} else {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
|
|
ret = spi_sync(st->spi, &st->msg);
|
|
break;
|
|
case AD9834_RESET:
|
|
if (val)
|
|
st->control &= ~AD9834_RESET;
|
|
else
|
|
st->control |= AD9834_RESET;
|
|
|
|
st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
|
|
ret = spi_sync(st->spi, &st->msg);
|
|
break;
|
|
default:
|
|
ret = -ENODEV;
|
|
}
|
|
mutex_unlock(&indio_dev->mlock);
|
|
|
|
error_ret:
|
|
return ret ? ret : len;
|
|
}
|
|
|
|
static ssize_t ad9834_store_wavetype(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct ad9834_state *st = iio_priv(indio_dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int ret = 0;
|
|
bool is_ad9833_7 = (st->devid == ID_AD9833) || (st->devid == ID_AD9837);
|
|
|
|
mutex_lock(&indio_dev->mlock);
|
|
|
|
switch ((u32) this_attr->address) {
|
|
case 0:
|
|
if (sysfs_streq(buf, "sine")) {
|
|
st->control &= ~AD9834_MODE;
|
|
if (is_ad9833_7)
|
|
st->control &= ~AD9834_OPBITEN;
|
|
} else if (sysfs_streq(buf, "triangle")) {
|
|
if (is_ad9833_7) {
|
|
st->control &= ~AD9834_OPBITEN;
|
|
st->control |= AD9834_MODE;
|
|
} else if (st->control & AD9834_OPBITEN) {
|
|
ret = -EINVAL; /* AD9843 reserved mode */
|
|
} else {
|
|
st->control |= AD9834_MODE;
|
|
}
|
|
} else if (is_ad9833_7 && sysfs_streq(buf, "square")) {
|
|
st->control &= ~AD9834_MODE;
|
|
st->control |= AD9834_OPBITEN;
|
|
} else {
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
break;
|
|
case 1:
|
|
if (sysfs_streq(buf, "square") &&
|
|
!(st->control & AD9834_MODE)) {
|
|
st->control &= ~AD9834_MODE;
|
|
st->control |= AD9834_OPBITEN;
|
|
} else {
|
|
ret = -EINVAL;
|
|
}
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (!ret) {
|
|
st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
|
|
ret = spi_sync(st->spi, &st->msg);
|
|
}
|
|
mutex_unlock(&indio_dev->mlock);
|
|
|
|
return ret ? ret : len;
|
|
}
|
|
|
|
static ssize_t ad9834_show_out0_wavetype_available(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct ad9834_state *st = iio_priv(indio_dev);
|
|
char *str;
|
|
|
|
if ((st->devid == ID_AD9833) || (st->devid == ID_AD9837))
|
|
str = "sine triangle square";
|
|
else if (st->control & AD9834_OPBITEN)
|
|
str = "sine";
|
|
else
|
|
str = "sine triangle";
|
|
|
|
return sprintf(buf, "%s\n", str);
|
|
}
|
|
|
|
|
|
static IIO_DEVICE_ATTR(out_altvoltage0_out0_wavetype_available, S_IRUGO,
|
|
ad9834_show_out0_wavetype_available, NULL, 0);
|
|
|
|
static ssize_t ad9834_show_out1_wavetype_available(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct ad9834_state *st = iio_priv(indio_dev);
|
|
char *str;
|
|
|
|
if (st->control & AD9834_MODE)
|
|
str = "";
|
|
else
|
|
str = "square";
|
|
|
|
return sprintf(buf, "%s\n", str);
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(out_altvoltage0_out1_wavetype_available, S_IRUGO,
|
|
ad9834_show_out1_wavetype_available, NULL, 0);
|
|
|
|
/**
|
|
* see dds.h for further information
|
|
*/
|
|
|
|
static IIO_DEV_ATTR_FREQ(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ0);
|
|
static IIO_DEV_ATTR_FREQ(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ1);
|
|
static IIO_DEV_ATTR_FREQSYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_FSEL);
|
|
static IIO_CONST_ATTR_FREQ_SCALE(0, "1"); /* 1Hz */
|
|
|
|
static IIO_DEV_ATTR_PHASE(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE0);
|
|
static IIO_DEV_ATTR_PHASE(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE1);
|
|
static IIO_DEV_ATTR_PHASESYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_PSEL);
|
|
static IIO_CONST_ATTR_PHASE_SCALE(0, "0.0015339808"); /* 2PI/2^12 rad*/
|
|
|
|
static IIO_DEV_ATTR_PINCONTROL_EN(0, S_IWUSR, NULL,
|
|
ad9834_write, AD9834_PIN_SW);
|
|
static IIO_DEV_ATTR_OUT_ENABLE(0, S_IWUSR, NULL, ad9834_write, AD9834_RESET);
|
|
static IIO_DEV_ATTR_OUTY_ENABLE(0, 1, S_IWUSR, NULL,
|
|
ad9834_write, AD9834_OPBITEN);
|
|
static IIO_DEV_ATTR_OUT_WAVETYPE(0, 0, ad9834_store_wavetype, 0);
|
|
static IIO_DEV_ATTR_OUT_WAVETYPE(0, 1, ad9834_store_wavetype, 1);
|
|
|
|
static struct attribute *ad9834_attributes[] = {
|
|
&iio_dev_attr_out_altvoltage0_frequency0.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_frequency1.dev_attr.attr,
|
|
&iio_const_attr_out_altvoltage0_frequency_scale.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_phase0.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_phase1.dev_attr.attr,
|
|
&iio_const_attr_out_altvoltage0_phase_scale.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_pincontrol_en.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_frequencysymbol.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_phasesymbol.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_out_enable.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_out1_enable.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_out0_wavetype.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_out1_wavetype.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_out0_wavetype_available.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_out1_wavetype_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute *ad9833_attributes[] = {
|
|
&iio_dev_attr_out_altvoltage0_frequency0.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_frequency1.dev_attr.attr,
|
|
&iio_const_attr_out_altvoltage0_frequency_scale.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_phase0.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_phase1.dev_attr.attr,
|
|
&iio_const_attr_out_altvoltage0_phase_scale.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_frequencysymbol.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_phasesymbol.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_out_enable.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_out0_wavetype.dev_attr.attr,
|
|
&iio_dev_attr_out_altvoltage0_out0_wavetype_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group ad9834_attribute_group = {
|
|
.attrs = ad9834_attributes,
|
|
};
|
|
|
|
static const struct attribute_group ad9833_attribute_group = {
|
|
.attrs = ad9833_attributes,
|
|
};
|
|
|
|
static const struct iio_info ad9834_info = {
|
|
.attrs = &ad9834_attribute_group,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static const struct iio_info ad9833_info = {
|
|
.attrs = &ad9833_attribute_group,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static int ad9834_probe(struct spi_device *spi)
|
|
{
|
|
struct ad9834_platform_data *pdata = spi->dev.platform_data;
|
|
struct ad9834_state *st;
|
|
struct iio_dev *indio_dev;
|
|
struct regulator *reg;
|
|
int ret;
|
|
|
|
if (!pdata) {
|
|
dev_dbg(&spi->dev, "no platform data?\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
reg = regulator_get(&spi->dev, "vcc");
|
|
if (!IS_ERR(reg)) {
|
|
ret = regulator_enable(reg);
|
|
if (ret)
|
|
goto error_put_reg;
|
|
}
|
|
|
|
indio_dev = iio_device_alloc(sizeof(*st));
|
|
if (indio_dev == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_disable_reg;
|
|
}
|
|
spi_set_drvdata(spi, indio_dev);
|
|
st = iio_priv(indio_dev);
|
|
st->mclk = pdata->mclk;
|
|
st->spi = spi;
|
|
st->devid = spi_get_device_id(spi)->driver_data;
|
|
st->reg = reg;
|
|
indio_dev->dev.parent = &spi->dev;
|
|
indio_dev->name = spi_get_device_id(spi)->name;
|
|
switch (st->devid) {
|
|
case ID_AD9833:
|
|
case ID_AD9837:
|
|
indio_dev->info = &ad9833_info;
|
|
break;
|
|
default:
|
|
indio_dev->info = &ad9834_info;
|
|
break;
|
|
}
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
/* Setup default messages */
|
|
|
|
st->xfer.tx_buf = &st->data;
|
|
st->xfer.len = 2;
|
|
|
|
spi_message_init(&st->msg);
|
|
spi_message_add_tail(&st->xfer, &st->msg);
|
|
|
|
st->freq_xfer[0].tx_buf = &st->freq_data[0];
|
|
st->freq_xfer[0].len = 2;
|
|
st->freq_xfer[0].cs_change = 1;
|
|
st->freq_xfer[1].tx_buf = &st->freq_data[1];
|
|
st->freq_xfer[1].len = 2;
|
|
|
|
spi_message_init(&st->freq_msg);
|
|
spi_message_add_tail(&st->freq_xfer[0], &st->freq_msg);
|
|
spi_message_add_tail(&st->freq_xfer[1], &st->freq_msg);
|
|
|
|
st->control = AD9834_B28 | AD9834_RESET;
|
|
|
|
if (!pdata->en_div2)
|
|
st->control |= AD9834_DIV2;
|
|
|
|
if (!pdata->en_signbit_msb_out && (st->devid == ID_AD9834))
|
|
st->control |= AD9834_SIGN_PIB;
|
|
|
|
st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
|
|
ret = spi_sync(st->spi, &st->msg);
|
|
if (ret) {
|
|
dev_err(&spi->dev, "device init failed\n");
|
|
goto error_free_device;
|
|
}
|
|
|
|
ret = ad9834_write_frequency(st, AD9834_REG_FREQ0, pdata->freq0);
|
|
if (ret)
|
|
goto error_free_device;
|
|
|
|
ret = ad9834_write_frequency(st, AD9834_REG_FREQ1, pdata->freq1);
|
|
if (ret)
|
|
goto error_free_device;
|
|
|
|
ret = ad9834_write_phase(st, AD9834_REG_PHASE0, pdata->phase0);
|
|
if (ret)
|
|
goto error_free_device;
|
|
|
|
ret = ad9834_write_phase(st, AD9834_REG_PHASE1, pdata->phase1);
|
|
if (ret)
|
|
goto error_free_device;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto error_free_device;
|
|
|
|
return 0;
|
|
|
|
error_free_device:
|
|
iio_device_free(indio_dev);
|
|
error_disable_reg:
|
|
if (!IS_ERR(reg))
|
|
regulator_disable(reg);
|
|
error_put_reg:
|
|
if (!IS_ERR(reg))
|
|
regulator_put(reg);
|
|
return ret;
|
|
}
|
|
|
|
static int ad9834_remove(struct spi_device *spi)
|
|
{
|
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
|
struct ad9834_state *st = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
if (!IS_ERR(st->reg)) {
|
|
regulator_disable(st->reg);
|
|
regulator_put(st->reg);
|
|
}
|
|
iio_device_free(indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct spi_device_id ad9834_id[] = {
|
|
{"ad9833", ID_AD9833},
|
|
{"ad9834", ID_AD9834},
|
|
{"ad9837", ID_AD9837},
|
|
{"ad9838", ID_AD9838},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, ad9834_id);
|
|
|
|
static struct spi_driver ad9834_driver = {
|
|
.driver = {
|
|
.name = "ad9834",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ad9834_probe,
|
|
.remove = ad9834_remove,
|
|
.id_table = ad9834_id,
|
|
};
|
|
module_spi_driver(ad9834_driver);
|
|
|
|
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
|
MODULE_DESCRIPTION("Analog Devices AD9833/AD9834/AD9837/AD9838 DDS");
|
|
MODULE_LICENSE("GPL v2");
|