466 lines
12 KiB
C
466 lines
12 KiB
C
/*
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* AD9833/AD9834/AD9837/AD9838 SPI DDS driver
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*
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* Copyright 2010-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/list.h>
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#include <linux/spi/spi.h>
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#include <linux/regulator/consumer.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <asm/div64.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "dds.h"
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#include "ad9834.h"
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static unsigned int ad9834_calc_freqreg(unsigned long mclk, unsigned long fout)
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{
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unsigned long long freqreg = (u64) fout * (u64) (1 << AD9834_FREQ_BITS);
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do_div(freqreg, mclk);
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return freqreg;
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}
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static int ad9834_write_frequency(struct ad9834_state *st,
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unsigned long addr, unsigned long fout)
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{
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unsigned long regval;
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if (fout > (st->mclk / 2))
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return -EINVAL;
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regval = ad9834_calc_freqreg(st->mclk, fout);
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st->freq_data[0] = cpu_to_be16(addr | (regval &
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RES_MASK(AD9834_FREQ_BITS / 2)));
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st->freq_data[1] = cpu_to_be16(addr | ((regval >>
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(AD9834_FREQ_BITS / 2)) &
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RES_MASK(AD9834_FREQ_BITS / 2)));
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return spi_sync(st->spi, &st->freq_msg);
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}
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static int ad9834_write_phase(struct ad9834_state *st,
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unsigned long addr, unsigned long phase)
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{
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if (phase > (1 << AD9834_PHASE_BITS))
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return -EINVAL;
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st->data = cpu_to_be16(addr | phase);
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return spi_sync(st->spi, &st->msg);
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}
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static ssize_t ad9834_write(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad9834_state *st = iio_priv(dev_info);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int ret;
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long val;
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ret = strict_strtoul(buf, 10, &val);
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if (ret)
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goto error_ret;
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mutex_lock(&dev_info->mlock);
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switch (this_attr->address) {
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case AD9834_REG_FREQ0:
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case AD9834_REG_FREQ1:
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ret = ad9834_write_frequency(st, this_attr->address, val);
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break;
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case AD9834_REG_PHASE0:
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case AD9834_REG_PHASE1:
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ret = ad9834_write_phase(st, this_attr->address, val);
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break;
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case AD9834_OPBITEN:
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if (st->control & AD9834_MODE) {
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ret = -EINVAL; /* AD9843 reserved mode */
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break;
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}
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if (val)
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st->control |= AD9834_OPBITEN;
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else
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st->control &= ~AD9834_OPBITEN;
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st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
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ret = spi_sync(st->spi, &st->msg);
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break;
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case AD9834_PIN_SW:
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if (val)
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st->control |= AD9834_PIN_SW;
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else
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st->control &= ~AD9834_PIN_SW;
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st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
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ret = spi_sync(st->spi, &st->msg);
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break;
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case AD9834_FSEL:
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case AD9834_PSEL:
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if (val == 0)
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st->control &= ~(this_attr->address | AD9834_PIN_SW);
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else if (val == 1) {
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st->control |= this_attr->address;
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st->control &= ~AD9834_PIN_SW;
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} else {
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ret = -EINVAL;
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break;
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}
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st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
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ret = spi_sync(st->spi, &st->msg);
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break;
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case AD9834_RESET:
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if (val)
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st->control &= ~AD9834_RESET;
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else
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st->control |= AD9834_RESET;
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st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
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ret = spi_sync(st->spi, &st->msg);
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break;
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default:
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ret = -ENODEV;
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}
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mutex_unlock(&dev_info->mlock);
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error_ret:
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return ret ? ret : len;
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}
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static ssize_t ad9834_store_wavetype(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad9834_state *st = iio_priv(dev_info);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int ret = 0;
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bool is_ad9833_7 = (st->devid == ID_AD9833) || (st->devid == ID_AD9837);
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mutex_lock(&dev_info->mlock);
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switch (this_attr->address) {
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case 0:
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if (sysfs_streq(buf, "sine")) {
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st->control &= ~AD9834_MODE;
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if (is_ad9833_7)
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st->control &= ~AD9834_OPBITEN;
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} else if (sysfs_streq(buf, "triangle")) {
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if (is_ad9833_7) {
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st->control &= ~AD9834_OPBITEN;
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st->control |= AD9834_MODE;
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} else if (st->control & AD9834_OPBITEN) {
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ret = -EINVAL; /* AD9843 reserved mode */
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} else {
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st->control |= AD9834_MODE;
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}
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} else if (is_ad9833_7 && sysfs_streq(buf, "square")) {
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st->control &= ~AD9834_MODE;
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st->control |= AD9834_OPBITEN;
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} else {
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ret = -EINVAL;
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}
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break;
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case 1:
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if (sysfs_streq(buf, "square") &&
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!(st->control & AD9834_MODE)) {
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st->control &= ~AD9834_MODE;
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st->control |= AD9834_OPBITEN;
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} else {
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ret = -EINVAL;
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}
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break;
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default:
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ret = -EINVAL;
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break;
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}
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if (!ret) {
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st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
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ret = spi_sync(st->spi, &st->msg);
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}
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mutex_unlock(&dev_info->mlock);
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return ret ? ret : len;
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}
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static ssize_t ad9834_show_out0_wavetype_available(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad9834_state *st = iio_priv(dev_info);
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char *str;
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if ((st->devid == ID_AD9833) || (st->devid == ID_AD9837))
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str = "sine triangle square";
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else if (st->control & AD9834_OPBITEN)
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str = "sine";
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else
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str = "sine triangle";
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return sprintf(buf, "%s\n", str);
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}
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static IIO_DEVICE_ATTR(dds0_out0_wavetype_available, S_IRUGO,
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ad9834_show_out0_wavetype_available, NULL, 0);
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static ssize_t ad9834_show_out1_wavetype_available(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad9834_state *st = iio_priv(dev_info);
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char *str;
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if (st->control & AD9834_MODE)
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str = "";
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else
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str = "square";
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return sprintf(buf, "%s\n", str);
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}
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static IIO_DEVICE_ATTR(dds0_out1_wavetype_available, S_IRUGO,
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ad9834_show_out1_wavetype_available, NULL, 0);
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/**
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* see dds.h for further information
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*/
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static IIO_DEV_ATTR_FREQ(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ0);
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static IIO_DEV_ATTR_FREQ(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_FREQ1);
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static IIO_DEV_ATTR_FREQSYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_FSEL);
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static IIO_CONST_ATTR_FREQ_SCALE(0, "1"); /* 1Hz */
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static IIO_DEV_ATTR_PHASE(0, 0, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE0);
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static IIO_DEV_ATTR_PHASE(0, 1, S_IWUSR, NULL, ad9834_write, AD9834_REG_PHASE1);
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static IIO_DEV_ATTR_PHASESYMBOL(0, S_IWUSR, NULL, ad9834_write, AD9834_PSEL);
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static IIO_CONST_ATTR_PHASE_SCALE(0, "0.0015339808"); /* 2PI/2^12 rad*/
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static IIO_DEV_ATTR_PINCONTROL_EN(0, S_IWUSR, NULL,
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ad9834_write, AD9834_PIN_SW);
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static IIO_DEV_ATTR_OUT_ENABLE(0, S_IWUSR, NULL, ad9834_write, AD9834_RESET);
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static IIO_DEV_ATTR_OUTY_ENABLE(0, 1, S_IWUSR, NULL,
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ad9834_write, AD9834_OPBITEN);
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static IIO_DEV_ATTR_OUT_WAVETYPE(0, 0, ad9834_store_wavetype, 0);
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static IIO_DEV_ATTR_OUT_WAVETYPE(0, 1, ad9834_store_wavetype, 1);
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static struct attribute *ad9834_attributes[] = {
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&iio_dev_attr_dds0_freq0.dev_attr.attr,
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&iio_dev_attr_dds0_freq1.dev_attr.attr,
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&iio_const_attr_dds0_freq_scale.dev_attr.attr,
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&iio_dev_attr_dds0_phase0.dev_attr.attr,
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&iio_dev_attr_dds0_phase1.dev_attr.attr,
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&iio_const_attr_dds0_phase_scale.dev_attr.attr,
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&iio_dev_attr_dds0_pincontrol_en.dev_attr.attr,
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&iio_dev_attr_dds0_freqsymbol.dev_attr.attr,
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&iio_dev_attr_dds0_phasesymbol.dev_attr.attr,
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&iio_dev_attr_dds0_out_enable.dev_attr.attr,
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&iio_dev_attr_dds0_out1_enable.dev_attr.attr,
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&iio_dev_attr_dds0_out0_wavetype.dev_attr.attr,
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&iio_dev_attr_dds0_out1_wavetype.dev_attr.attr,
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&iio_dev_attr_dds0_out0_wavetype_available.dev_attr.attr,
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&iio_dev_attr_dds0_out1_wavetype_available.dev_attr.attr,
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NULL,
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};
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static mode_t ad9834_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad9834_state *st = iio_priv(dev_info);
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mode_t mode = attr->mode;
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if (((st->devid == ID_AD9833) || (st->devid == ID_AD9837)) &&
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((attr == &iio_dev_attr_dds0_out1_enable.dev_attr.attr) ||
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(attr == &iio_dev_attr_dds0_out1_wavetype.dev_attr.attr) ||
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(attr ==
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&iio_dev_attr_dds0_out1_wavetype_available.dev_attr.attr) ||
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(attr == &iio_dev_attr_dds0_pincontrol_en.dev_attr.attr)))
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mode = 0;
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return mode;
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}
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static const struct attribute_group ad9834_attribute_group = {
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.attrs = ad9834_attributes,
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.is_visible = ad9834_attr_is_visible,
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};
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static const struct iio_info ad9834_info = {
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.attrs = &ad9834_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static int __devinit ad9834_probe(struct spi_device *spi)
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{
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struct ad9834_platform_data *pdata = spi->dev.platform_data;
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struct ad9834_state *st;
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struct iio_dev *indio_dev;
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struct regulator *reg;
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int ret;
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if (!pdata) {
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dev_dbg(&spi->dev, "no platform data?\n");
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return -ENODEV;
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}
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reg = regulator_get(&spi->dev, "vcc");
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if (!IS_ERR(reg)) {
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ret = regulator_enable(reg);
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if (ret)
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goto error_put_reg;
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}
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indio_dev = iio_allocate_device(sizeof(*st));
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if (indio_dev == NULL) {
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ret = -ENOMEM;
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goto error_disable_reg;
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}
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spi_set_drvdata(spi, indio_dev);
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st = iio_priv(indio_dev);
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st->mclk = pdata->mclk;
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st->spi = spi;
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st->devid = spi_get_device_id(spi)->driver_data;
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st->reg = reg;
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indio_dev->dev.parent = &spi->dev;
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indio_dev->name = spi_get_device_id(spi)->name;
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indio_dev->info = &ad9834_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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/* Setup default messages */
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st->xfer.tx_buf = &st->data;
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st->xfer.len = 2;
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spi_message_init(&st->msg);
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spi_message_add_tail(&st->xfer, &st->msg);
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st->freq_xfer[0].tx_buf = &st->freq_data[0];
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st->freq_xfer[0].len = 2;
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st->freq_xfer[0].cs_change = 1;
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st->freq_xfer[1].tx_buf = &st->freq_data[1];
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st->freq_xfer[1].len = 2;
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spi_message_init(&st->freq_msg);
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spi_message_add_tail(&st->freq_xfer[0], &st->freq_msg);
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spi_message_add_tail(&st->freq_xfer[1], &st->freq_msg);
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st->control = AD9834_B28 | AD9834_RESET;
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if (!pdata->en_div2)
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st->control |= AD9834_DIV2;
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if (!pdata->en_signbit_msb_out && (st->devid == ID_AD9834))
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st->control |= AD9834_SIGN_PIB;
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st->data = cpu_to_be16(AD9834_REG_CMD | st->control);
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ret = spi_sync(st->spi, &st->msg);
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if (ret) {
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dev_err(&spi->dev, "device init failed\n");
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goto error_free_device;
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}
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ret = ad9834_write_frequency(st, AD9834_REG_FREQ0, pdata->freq0);
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if (ret)
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goto error_free_device;
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ret = ad9834_write_frequency(st, AD9834_REG_FREQ1, pdata->freq1);
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if (ret)
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goto error_free_device;
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ret = ad9834_write_phase(st, AD9834_REG_PHASE0, pdata->phase0);
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if (ret)
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goto error_free_device;
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ret = ad9834_write_phase(st, AD9834_REG_PHASE1, pdata->phase1);
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if (ret)
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goto error_free_device;
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ret = iio_device_register(indio_dev);
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if (ret)
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goto error_free_device;
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return 0;
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error_free_device:
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iio_free_device(indio_dev);
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error_disable_reg:
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if (!IS_ERR(reg))
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regulator_disable(reg);
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error_put_reg:
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if (!IS_ERR(reg))
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regulator_put(reg);
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return ret;
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}
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static int __devexit ad9834_remove(struct spi_device *spi)
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{
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struct iio_dev *indio_dev = spi_get_drvdata(spi);
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struct ad9834_state *st = iio_priv(indio_dev);
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struct regulator *reg = st->reg;
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iio_device_unregister(indio_dev);
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if (!IS_ERR(reg)) {
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regulator_disable(reg);
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regulator_put(reg);
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}
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return 0;
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}
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static const struct spi_device_id ad9834_id[] = {
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{"ad9833", ID_AD9833},
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{"ad9834", ID_AD9834},
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{"ad9837", ID_AD9837},
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{"ad9838", ID_AD9838},
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{}
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};
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static struct spi_driver ad9834_driver = {
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.driver = {
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.name = "ad9834",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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},
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.probe = ad9834_probe,
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.remove = __devexit_p(ad9834_remove),
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.id_table = ad9834_id,
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};
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static int __init ad9834_init(void)
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{
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return spi_register_driver(&ad9834_driver);
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}
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module_init(ad9834_init);
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static void __exit ad9834_exit(void)
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{
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spi_unregister_driver(&ad9834_driver);
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}
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module_exit(ad9834_exit);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("Analog Devices AD9833/AD9834/AD9837/AD9838 DDS");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("spi:ad9834");
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