421 lines
10 KiB
C
421 lines
10 KiB
C
/*
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* AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output Digital to Analog
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* Converter
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*
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* Copyright 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/fs.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/regulator/consumer.h>
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#include <linux/module.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "dac.h"
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#include "ad5791.h"
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static int ad5791_spi_write(struct spi_device *spi, u8 addr, u32 val)
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{
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union {
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u32 d32;
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u8 d8[4];
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} data;
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data.d32 = cpu_to_be32(AD5791_CMD_WRITE |
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AD5791_ADDR(addr) |
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(val & AD5791_DAC_MASK));
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return spi_write(spi, &data.d8[1], 3);
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}
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static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val)
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{
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union {
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u32 d32;
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u8 d8[4];
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} data[3];
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int ret;
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struct spi_message msg;
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struct spi_transfer xfers[] = {
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{
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.tx_buf = &data[0].d8[1],
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.bits_per_word = 8,
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.len = 3,
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.cs_change = 1,
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}, {
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.tx_buf = &data[1].d8[1],
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.rx_buf = &data[2].d8[1],
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.bits_per_word = 8,
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.len = 3,
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},
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};
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data[0].d32 = cpu_to_be32(AD5791_CMD_READ |
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AD5791_ADDR(addr));
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data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP));
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spi_message_init(&msg);
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spi_message_add_tail(&xfers[0], &msg);
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spi_message_add_tail(&xfers[1], &msg);
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ret = spi_sync(spi, &msg);
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*val = be32_to_cpu(data[2].d32);
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return ret;
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}
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#define AD5791_CHAN(bits, shift) { \
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.type = IIO_VOLTAGE, \
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.output = 1, \
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.indexed = 1, \
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.address = AD5791_ADDR_DAC0, \
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.channel = 0, \
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.info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT | \
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IIO_CHAN_INFO_OFFSET_SHARED_BIT, \
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.scan_type = IIO_ST('u', bits, 24, shift) \
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}
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static const struct iio_chan_spec ad5791_channels[] = {
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[ID_AD5760] = AD5791_CHAN(16, 4),
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[ID_AD5780] = AD5791_CHAN(18, 2),
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[ID_AD5781] = AD5791_CHAN(18, 2),
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[ID_AD5791] = AD5791_CHAN(20, 0)
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};
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static ssize_t ad5791_read_powerdown_mode(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5791_state *st = iio_priv(indio_dev);
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const char mode[][14] = {"6kohm_to_gnd", "three_state"};
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return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
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}
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static ssize_t ad5791_write_powerdown_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5791_state *st = iio_priv(indio_dev);
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int ret;
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if (sysfs_streq(buf, "6kohm_to_gnd"))
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st->pwr_down_mode = AD5791_DAC_PWRDN_6K;
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else if (sysfs_streq(buf, "three_state"))
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st->pwr_down_mode = AD5791_DAC_PWRDN_3STATE;
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else
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ret = -EINVAL;
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return ret ? ret : len;
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}
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static ssize_t ad5791_read_dac_powerdown(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 *indio_dev = dev_get_drvdata(dev);
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struct ad5791_state *st = iio_priv(indio_dev);
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return sprintf(buf, "%d\n", st->pwr_down);
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}
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static ssize_t ad5791_write_dac_powerdown(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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long readin;
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int ret;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5791_state *st = iio_priv(indio_dev);
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ret = strict_strtol(buf, 10, &readin);
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if (ret)
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return ret;
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if (readin == 0) {
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st->pwr_down = false;
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st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
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} else if (readin == 1) {
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st->pwr_down = true;
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if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K)
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st->ctrl |= AD5791_CTRL_OPGND;
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else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE)
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st->ctrl |= AD5791_CTRL_DACTRI;
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} else
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ret = -EINVAL;
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ret = ad5791_spi_write(st->spi, AD5791_ADDR_CTRL, st->ctrl);
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return ret ? ret : len;
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}
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static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO |
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S_IWUSR, ad5791_read_powerdown_mode,
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ad5791_write_powerdown_mode, 0);
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static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
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"6kohm_to_gnd three_state");
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#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
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IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \
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S_IRUGO | S_IWUSR, _show, _store, _addr)
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static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5791_read_dac_powerdown,
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ad5791_write_dac_powerdown, 0);
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static struct attribute *ad5791_attributes[] = {
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&iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
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&iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr,
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&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group ad5791_attribute_group = {
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.attrs = ad5791_attributes,
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};
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static int ad5791_get_lin_comp(unsigned int span)
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{
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if (span <= 10000)
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return AD5791_LINCOMP_0_10;
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else if (span <= 12000)
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return AD5791_LINCOMP_10_12;
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else if (span <= 16000)
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return AD5791_LINCOMP_12_16;
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else if (span <= 19000)
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return AD5791_LINCOMP_16_19;
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else
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return AD5791_LINCOMP_19_20;
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}
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static int ad5780_get_lin_comp(unsigned int span)
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{
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if (span <= 10000)
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return AD5780_LINCOMP_0_10;
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else
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return AD5780_LINCOMP_10_20;
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}
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static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
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[ID_AD5760] = {
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.get_lin_comp = ad5780_get_lin_comp,
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},
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[ID_AD5780] = {
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.get_lin_comp = ad5780_get_lin_comp,
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},
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[ID_AD5781] = {
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.get_lin_comp = ad5791_get_lin_comp,
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},
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[ID_AD5791] = {
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.get_lin_comp = ad5791_get_lin_comp,
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},
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};
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static int ad5791_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val,
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int *val2,
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long m)
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{
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struct ad5791_state *st = iio_priv(indio_dev);
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u64 val64;
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int ret;
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switch (m) {
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case 0:
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ret = ad5791_spi_read(st->spi, chan->address, val);
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if (ret)
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return ret;
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*val &= AD5791_DAC_MASK;
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*val >>= chan->scan_type.shift;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = (((u64)st->vref_mv) * 1000000ULL) >> chan->scan_type.realbits;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_OFFSET:
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val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits);
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do_div(val64, st->vref_mv);
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*val = -val64;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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};
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static int ad5791_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val,
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int val2,
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long mask)
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{
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struct ad5791_state *st = iio_priv(indio_dev);
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switch (mask) {
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case 0:
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val &= AD5791_RES_MASK(chan->scan_type.realbits);
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val <<= chan->scan_type.shift;
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return ad5791_spi_write(st->spi, chan->address, val);
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info ad5791_info = {
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.read_raw = &ad5791_read_raw,
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.write_raw = &ad5791_write_raw,
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.attrs = &ad5791_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static int __devinit ad5791_probe(struct spi_device *spi)
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{
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struct ad5791_platform_data *pdata = spi->dev.platform_data;
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struct iio_dev *indio_dev;
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struct ad5791_state *st;
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int ret, pos_voltage_uv = 0, neg_voltage_uv = 0;
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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_ret;
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}
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st = iio_priv(indio_dev);
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st->reg_vdd = regulator_get(&spi->dev, "vdd");
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if (!IS_ERR(st->reg_vdd)) {
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ret = regulator_enable(st->reg_vdd);
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if (ret)
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goto error_put_reg_pos;
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pos_voltage_uv = regulator_get_voltage(st->reg_vdd);
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}
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st->reg_vss = regulator_get(&spi->dev, "vss");
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if (!IS_ERR(st->reg_vss)) {
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ret = regulator_enable(st->reg_vss);
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if (ret)
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goto error_put_reg_neg;
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neg_voltage_uv = regulator_get_voltage(st->reg_vss);
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}
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st->pwr_down = true;
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st->spi = spi;
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if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) {
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st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000;
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st->vref_neg_mv = neg_voltage_uv / 1000;
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} else if (pdata) {
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st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv;
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st->vref_neg_mv = pdata->vref_neg_mv;
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} else {
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dev_warn(&spi->dev, "reference voltage unspecified\n");
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}
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ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
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if (ret)
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goto error_disable_reg_neg;
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st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi)
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->driver_data];
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st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
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| ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |
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AD5791_CTRL_BIN2SC;
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ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl |
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AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
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if (ret)
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goto error_disable_reg_neg;
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spi_set_drvdata(spi, indio_dev);
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indio_dev->dev.parent = &spi->dev;
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indio_dev->info = &ad5791_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels
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= &ad5791_channels[spi_get_device_id(spi)->driver_data];
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indio_dev->num_channels = 1;
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indio_dev->name = spi_get_device_id(st->spi)->name;
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ret = iio_device_register(indio_dev);
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if (ret)
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goto error_disable_reg_neg;
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return 0;
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error_disable_reg_neg:
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if (!IS_ERR(st->reg_vss))
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regulator_disable(st->reg_vss);
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error_put_reg_neg:
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if (!IS_ERR(st->reg_vss))
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regulator_put(st->reg_vss);
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if (!IS_ERR(st->reg_vdd))
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regulator_disable(st->reg_vdd);
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error_put_reg_pos:
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if (!IS_ERR(st->reg_vdd))
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regulator_put(st->reg_vdd);
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iio_free_device(indio_dev);
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error_ret:
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return ret;
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}
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static int __devexit ad5791_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 ad5791_state *st = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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if (!IS_ERR(st->reg_vdd)) {
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regulator_disable(st->reg_vdd);
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regulator_put(st->reg_vdd);
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}
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if (!IS_ERR(st->reg_vss)) {
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regulator_disable(st->reg_vss);
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regulator_put(st->reg_vss);
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}
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iio_free_device(indio_dev);
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return 0;
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}
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static const struct spi_device_id ad5791_id[] = {
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{"ad5760", ID_AD5760},
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{"ad5780", ID_AD5780},
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{"ad5781", ID_AD5781},
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{"ad5790", ID_AD5791},
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{"ad5791", ID_AD5791},
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{}
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};
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MODULE_DEVICE_TABLE(spi, ad5791_id);
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static struct spi_driver ad5791_driver = {
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.driver = {
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.name = "ad5791",
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.owner = THIS_MODULE,
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},
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.probe = ad5791_probe,
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.remove = __devexit_p(ad5791_remove),
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.id_table = ad5791_id,
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};
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module_spi_driver(ad5791_driver);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("Analog Devices AD5760/AD5780/AD5781/AD5790/AD5791 DAC");
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MODULE_LICENSE("GPL v2");
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