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Staging: IIO: DDS: AD9833 / AD9834 driver

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Changes since RFC/v1:
IIO: Apply list review feedback

Apply list review feedback:
	Rename attributes to fit IIO convention used in other drivers.
	Fix typos.
	Provide ddsX_out_enable as opposed to ddsX_out_disable.
	Use proper __devexit marking.
	Use strict_strtoul() to avoid negatives.

Changes since v2:
IIO: ad9834.c: Apply more list review feedback

	Update use of dds convenience macros.
	Fix tabbing.
	Remove superfluous brackets.
	Keep output disabled after probe.
	Remove unnecessary code.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Reviewed-by: Datta Shubhrajyoti <shubhrajyoti@ti.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich 2010-12-14 17:04:02 +01:00 committed by Greg Kroah-Hartman
parent 4851d97d87
commit 12b9d5bf76
4 changed files with 600 additions and 0 deletions
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10
drivers/staging/iio/dds/Kconfig
View File

@ -17,6 +17,16 @@ config AD9832
Say yes here to build support for Analog Devices DDS chip
ad9832 and ad9835, provides direct access via sysfs.
config AD9834
tristate "Analog Devices ad9833/4/ driver"
depends on SPI
help
Say yes here to build support for Analog Devices DDS chip
AD9833 and AD9834, provides direct access via sysfs.
To compile this driver as a module, choose M here: the
module will be called ad9834.
config AD9850
tristate "Analog Devices ad9850/1 driver"
depends on SPI

1
drivers/staging/iio/dds/Makefile
View File

@ -4,6 +4,7 @@
obj-$(CONFIG_AD5930) += ad5930.o
obj-$(CONFIG_AD9832) += ad9832.o
obj-$(CONFIG_AD9834) += ad9834.o
obj-$(CONFIG_AD9850) += ad9850.o
obj-$(CONFIG_AD9852) += ad9852.o
obj-$(CONFIG_AD9910) += ad9910.o

477
drivers/staging/iio/dds/ad9834.c Normal file
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@ -0,0 +1,477 @@
/*
* AD9834 SPI DAC driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#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 <asm/div64.h>
#include "../iio.h"
#include "../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 *dev_info = dev_get_drvdata(dev);
struct ad9834_state *st = dev_info->dev_data;
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(&dev_info->mlock);
switch (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(&dev_info->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 *dev_info = dev_get_drvdata(dev);
struct ad9834_state *st = dev_info->dev_data;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret = 0;
bool is_ad9833 = st->devid == ID_AD9833;
mutex_lock(&dev_info->mlock);
switch (this_attr->address) {
case 0:
if (sysfs_streq(buf, "sine")) {
st->control &= ~AD9834_MODE;
if (is_ad9833)
st->control &= ~AD9834_OPBITEN;
} else if (sysfs_streq(buf, "triangle")) {
if (is_ad9833) {
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 && 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(&dev_info->mlock);
return ret ? ret : len;
}
static ssize_t ad9834_show_name(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad9834_state *st = iio_dev_get_devdata(dev_info);
return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name);
}
static IIO_DEVICE_ATTR(name, S_IRUGO, ad9834_show_name, NULL, 0);
static ssize_t ad9834_show_out0_wavetype_available(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad9834_state *st = iio_dev_get_devdata(dev_info);
char *str;
if (st->devid == ID_AD9833)
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(dds0_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 *dev_info = dev_get_drvdata(dev);
struct ad9834_state *st = iio_dev_get_devdata(dev_info);
char *str;
if (st->control & AD9834_MODE)
str = "";
else
str = "square";
return sprintf(buf, "%s\n", str);
}
static IIO_DEVICE_ATTR(dds0_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_dds0_freq0.dev_attr.attr,
&iio_dev_attr_dds0_freq1.dev_attr.attr,
&iio_const_attr_dds0_freq_scale.dev_attr.attr,
&iio_dev_attr_dds0_phase0.dev_attr.attr,
&iio_dev_attr_dds0_phase1.dev_attr.attr,
&iio_const_attr_dds0_phase_scale.dev_attr.attr,
&iio_dev_attr_dds0_pincontrol_en.dev_attr.attr,
&iio_dev_attr_dds0_freqsymbol.dev_attr.attr,
&iio_dev_attr_dds0_phasesymbol.dev_attr.attr,
&iio_dev_attr_dds0_out_enable.dev_attr.attr,
&iio_dev_attr_dds0_out1_enable.dev_attr.attr,
&iio_dev_attr_dds0_out0_wavetype.dev_attr.attr,
&iio_dev_attr_dds0_out1_wavetype.dev_attr.attr,
&iio_dev_attr_dds0_out0_wavetype_available.dev_attr.attr,
&iio_dev_attr_dds0_out1_wavetype_available.dev_attr.attr,
&iio_dev_attr_name.dev_attr.attr,
NULL,
};
static mode_t ad9834_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad9834_state *st = iio_dev_get_devdata(dev_info);
mode_t mode = attr->mode;
if (st->devid == ID_AD9834)
return mode;
if ((attr == &iio_dev_attr_dds0_out1_enable.dev_attr.attr) ||
(attr == &iio_dev_attr_dds0_out1_wavetype.dev_attr.attr) ||
(attr ==
&iio_dev_attr_dds0_out1_wavetype_available.dev_attr.attr))
mode = 0;
return mode;
}
static const struct attribute_group ad9834_attribute_group = {
.attrs = ad9834_attributes,
.is_visible = ad9834_attr_is_visible,
};
static int __devinit ad9834_probe(struct spi_device *spi)
{
struct ad9834_platform_data *pdata = spi->dev.platform_data;
struct ad9834_state *st;
int ret;
if (!pdata) {
dev_dbg(&spi->dev, "no platform data?\n");
return -ENODEV;
}
st = kzalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL) {
ret = -ENOMEM;
goto error_ret;
}
st->reg = regulator_get(&spi->dev, "vcc");
if (!IS_ERR(st->reg)) {
ret = regulator_enable(st->reg);
if (ret)
goto error_put_reg;
}
st->mclk = pdata->mclk;
spi_set_drvdata(spi, st);
st->spi = spi;
st->devid = spi_get_device_id(spi)->driver_data;
st->indio_dev = iio_allocate_device();
if (st->indio_dev == NULL) {
ret = -ENOMEM;
goto error_disable_reg;
}
st->indio_dev->dev.parent = &spi->dev;
st->indio_dev->attrs = &ad9834_attribute_group;
st->indio_dev->dev_data = (void *) st;
st->indio_dev->driver_module = THIS_MODULE;
st->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(st->indio_dev);
if (ret)
goto error_free_device;
return 0;
error_free_device:
iio_free_device(st->indio_dev);
error_disable_reg:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
error_put_reg:
if (!IS_ERR(st->reg))
regulator_put(st->reg);
kfree(st);
error_ret:
return ret;
}
static int __devexit ad9834_remove(struct spi_device *spi)
{
struct ad9834_state *st = spi_get_drvdata(spi);
iio_device_unregister(st->indio_dev);
if (!IS_ERR(st->reg)) {
regulator_disable(st->reg);
regulator_put(st->reg);
}
kfree(st);
return 0;
}
static const struct spi_device_id ad9834_id[] = {
{"ad9833", ID_AD9833},
{"ad9834", ID_AD9834},
{}
};
static struct spi_driver ad9834_driver = {
.driver = {
.name = "ad9834",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = ad9834_probe,
.remove = __devexit_p(ad9834_remove),
.id_table = ad9834_id,
};
static int __init ad9834_init(void)
{
return spi_register_driver(&ad9834_driver);
}
module_init(ad9834_init);
static void __exit ad9834_exit(void)
{
spi_unregister_driver(&ad9834_driver);
}
module_exit(ad9834_exit);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD9833/AD9834 DDS");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:ad9834");

112
drivers/staging/iio/dds/ad9834.h Normal file
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@ -0,0 +1,112 @@
/*
* AD9834 SPI DDS driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef IIO_DDS_AD9834_H_
#define IIO_DDS_AD9834_H_
/* Registers */
#define AD9834_REG_CMD (0 << 14)
#define AD9834_REG_FREQ0 (1 << 14)
#define AD9834_REG_FREQ1 (2 << 14)
#define AD9834_REG_PHASE0 (6 << 13)
#define AD9834_REG_PHASE1 (7 << 13)
/* Command Control Bits */
#define AD9834_B28 (1 << 13)
#define AD9834_HLB (1 << 12)
#define AD9834_FSEL (1 << 11)
#define AD9834_PSEL (1 << 10)
#define AD9834_PIN_SW (1 << 9)
#define AD9834_RESET (1 << 8)
#define AD9834_SLEEP1 (1 << 7)
#define AD9834_SLEEP12 (1 << 6)
#define AD9834_OPBITEN (1 << 5)
#define AD9834_SIGN_PIB (1 << 4)
#define AD9834_DIV2 (1 << 3)
#define AD9834_MODE (1 << 1)
#define AD9834_FREQ_BITS 28
#define AD9834_PHASE_BITS 12
#define RES_MASK(bits) ((1 << (bits)) - 1)
/**
* struct ad9834_state - driver instance specific data
* @indio_dev: the industrial I/O device
* @spi: spi_device
* @reg: supply regulator
* @mclk: external master clock
* @control: cached control word
* @xfer: default spi transfer
* @msg: default spi message
* @freq_xfer: tuning word spi transfer
* @freq_msg: tuning word spi message
* @data: spi transmit buffer
* @freq_data: tuning word spi transmit buffer
*/
struct ad9834_state {
struct iio_dev *indio_dev;
struct spi_device *spi;
struct regulator *reg;
unsigned int mclk;
unsigned short control;
unsigned short devid;
struct spi_transfer xfer;
struct spi_message msg;
struct spi_transfer freq_xfer[2];
struct spi_message freq_msg;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
*/
unsigned short data ____cacheline_aligned;
unsigned short freq_data[2] ;
};
/*
* TODO: struct ad7887_platform_data needs to go into include/linux/iio
*/
/**
* struct ad9834_platform_data - platform specific information
* @mclk: master clock in Hz
* @freq0: power up freq0 tuning word in Hz
* @freq1: power up freq1 tuning word in Hz
* @phase0: power up phase0 value [0..4095] correlates with 0..2PI
* @phase1: power up phase1 value [0..4095] correlates with 0..2PI
* @en_div2: digital output/2 is passed to the SIGN BIT OUT pin
* @en_signbit_msb_out: the MSB (or MSB/2) of the DAC data is connected to the
* SIGN BIT OUT pin. en_div2 controls whether it is the MSB
* or MSB/2 that is output. if en_signbit_msb_out=false,
* the on-board comparator is connected to SIGN BIT OUT
*/
struct ad9834_platform_data {
unsigned int mclk;
unsigned int freq0;
unsigned int freq1;
unsigned short phase0;
unsigned short phase1;
bool en_div2;
bool en_signbit_msb_out;
};
/**
* ad9834_supported_device_ids:
*/
enum ad9834_supported_device_ids {
ID_AD9833,
ID_AD9834,
};
#endif /* IIO_DDS_AD9834_H_ */