382 lines
8.8 KiB
C
382 lines
8.8 KiB
C
/*
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* AD5446 SPI DAC driver
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*
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* Copyright 2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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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 <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include "ad5446.h"
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static int ad5446_write(struct ad5446_state *st, unsigned val)
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{
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__be16 data = cpu_to_be16(val);
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return spi_write(st->spi, &data, sizeof(data));
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}
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static int ad5660_write(struct ad5446_state *st, unsigned val)
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{
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uint8_t data[3];
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data[0] = (val >> 16) & 0xFF;
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data[1] = (val >> 8) & 0xFF;
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data[2] = val & 0xFF;
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return spi_write(st->spi, data, sizeof(data));
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}
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static const char * const ad5446_powerdown_modes[] = {
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"1kohm_to_gnd", "100kohm_to_gnd", "three_state"
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};
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static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, unsigned int mode)
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{
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struct ad5446_state *st = iio_priv(indio_dev);
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st->pwr_down_mode = mode + 1;
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return 0;
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}
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static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan)
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{
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struct ad5446_state *st = iio_priv(indio_dev);
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return st->pwr_down_mode - 1;
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}
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static const struct iio_enum ad5446_powerdown_mode_enum = {
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.items = ad5446_powerdown_modes,
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.num_items = ARRAY_SIZE(ad5446_powerdown_modes),
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.get = ad5446_get_powerdown_mode,
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.set = ad5446_set_powerdown_mode,
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};
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static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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char *buf)
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{
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struct ad5446_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 ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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const char *buf, size_t len)
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{
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struct ad5446_state *st = iio_priv(indio_dev);
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unsigned int shift;
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unsigned int val;
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bool powerdown;
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int ret;
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ret = strtobool(buf, &powerdown);
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if (ret)
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return ret;
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mutex_lock(&indio_dev->mlock);
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st->pwr_down = powerdown;
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if (st->pwr_down) {
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shift = chan->scan_type.realbits + chan->scan_type.shift;
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val = st->pwr_down_mode << shift;
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} else {
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val = st->cached_val;
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}
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ret = st->chip_info->write(st, val);
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mutex_unlock(&indio_dev->mlock);
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return ret ? ret : len;
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}
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static const struct iio_chan_spec_ext_info ad5064_ext_info_powerdown[] = {
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{
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.name = "powerdown",
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.read = ad5446_read_dac_powerdown,
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.write = ad5446_write_dac_powerdown,
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},
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IIO_ENUM("powerdown_mode", false, &ad5446_powerdown_mode_enum),
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IIO_ENUM_AVAILABLE("powerdown_mode", &ad5446_powerdown_mode_enum),
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{ },
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};
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#define _AD5446_CHANNEL(bits, storage, shift, ext) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.output = 1, \
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.channel = 0, \
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.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
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IIO_CHAN_INFO_SCALE_SHARED_BIT, \
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.scan_type = IIO_ST('u', (bits), (storage), (shift)), \
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.ext_info = (ext), \
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}
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#define AD5446_CHANNEL(bits, storage, shift) \
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_AD5446_CHANNEL(bits, storage, shift, NULL)
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#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \
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_AD5446_CHANNEL(bits, storage, shift, ad5064_ext_info_powerdown)
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static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
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[ID_AD5444] = {
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.channel = AD5446_CHANNEL(12, 16, 2),
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.write = ad5446_write,
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},
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[ID_AD5446] = {
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.channel = AD5446_CHANNEL(14, 16, 0),
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.write = ad5446_write,
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},
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[ID_AD5541A] = {
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.channel = AD5446_CHANNEL(16, 16, 0),
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.write = ad5446_write,
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},
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[ID_AD5512A] = {
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.channel = AD5446_CHANNEL(12, 16, 4),
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.write = ad5446_write,
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},
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[ID_AD5553] = {
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.channel = AD5446_CHANNEL(14, 16, 0),
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.write = ad5446_write,
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},
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[ID_AD5601] = {
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.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6),
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.write = ad5446_write,
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},
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[ID_AD5611] = {
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.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4),
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.write = ad5446_write,
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},
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[ID_AD5621] = {
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.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
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.write = ad5446_write,
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},
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[ID_AD5620_2500] = {
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.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
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.int_vref_mv = 2500,
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.write = ad5446_write,
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},
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[ID_AD5620_1250] = {
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.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
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.int_vref_mv = 1250,
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.write = ad5446_write,
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},
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[ID_AD5640_2500] = {
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.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
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.int_vref_mv = 2500,
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.write = ad5446_write,
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},
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[ID_AD5640_1250] = {
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.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
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.int_vref_mv = 1250,
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.write = ad5446_write,
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},
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[ID_AD5660_2500] = {
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.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
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.int_vref_mv = 2500,
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.write = ad5660_write,
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},
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[ID_AD5660_1250] = {
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.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
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.int_vref_mv = 1250,
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.write = ad5660_write,
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},
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[ID_AD5662] = {
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.channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
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.write = ad5660_write,
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},
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};
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static int ad5446_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 ad5446_state *st = iio_priv(indio_dev);
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unsigned long scale_uv;
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switch (m) {
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case IIO_CHAN_INFO_RAW:
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*val = st->cached_val;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
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*val = scale_uv / 1000;
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*val2 = (scale_uv % 1000) * 1000;
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return IIO_VAL_INT_PLUS_MICRO;
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}
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return -EINVAL;
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}
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static int ad5446_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 ad5446_state *st = iio_priv(indio_dev);
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int ret = 0;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (val >= (1 << chan->scan_type.realbits) || val < 0)
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return -EINVAL;
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val <<= chan->scan_type.shift;
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mutex_lock(&indio_dev->mlock);
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st->cached_val = val;
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if (!st->pwr_down)
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ret = st->chip_info->write(st, val);
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mutex_unlock(&indio_dev->mlock);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static const struct iio_info ad5446_info = {
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.read_raw = ad5446_read_raw,
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.write_raw = ad5446_write_raw,
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.driver_module = THIS_MODULE,
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};
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static int __devinit ad5446_probe(struct spi_device *spi)
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{
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struct ad5446_state *st;
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struct iio_dev *indio_dev;
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struct regulator *reg;
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int ret, voltage_uv = 0;
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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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voltage_uv = regulator_get_voltage(reg);
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}
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indio_dev = iio_device_alloc(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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st = iio_priv(indio_dev);
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st->chip_info =
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&ad5446_chip_info_tbl[spi_get_device_id(spi)->driver_data];
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spi_set_drvdata(spi, indio_dev);
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st->reg = reg;
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st->spi = spi;
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/* Establish that the iio_dev is a child of the spi device */
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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 = &ad5446_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = &st->chip_info->channel;
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indio_dev->num_channels = 1;
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st->pwr_down_mode = MODE_PWRDWN_1k;
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if (st->chip_info->int_vref_mv)
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st->vref_mv = st->chip_info->int_vref_mv;
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else if (voltage_uv)
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st->vref_mv = voltage_uv / 1000;
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else
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dev_warn(&spi->dev, "reference voltage unspecified\n");
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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_device_free(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 ad5446_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 ad5446_state *st = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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if (!IS_ERR(st->reg)) {
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regulator_disable(st->reg);
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regulator_put(st->reg);
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}
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iio_device_free(indio_dev);
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return 0;
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}
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static const struct spi_device_id ad5446_id[] = {
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{"ad5444", ID_AD5444},
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{"ad5446", ID_AD5446},
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{"ad5512a", ID_AD5512A},
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{"ad5541a", ID_AD5541A},
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{"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */
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{"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */
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{"ad5553", ID_AD5553},
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{"ad5601", ID_AD5601},
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{"ad5611", ID_AD5611},
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{"ad5621", ID_AD5621},
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{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
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{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
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{"ad5640-2500", ID_AD5640_2500},
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{"ad5640-1250", ID_AD5640_1250},
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{"ad5660-2500", ID_AD5660_2500},
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{"ad5660-1250", ID_AD5660_1250},
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{"ad5662", ID_AD5662},
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{}
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};
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MODULE_DEVICE_TABLE(spi, ad5446_id);
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static struct spi_driver ad5446_driver = {
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.driver = {
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.name = "ad5446",
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.owner = THIS_MODULE,
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},
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.probe = ad5446_probe,
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.remove = __devexit_p(ad5446_remove),
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.id_table = ad5446_id,
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};
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module_spi_driver(ad5446_driver);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
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MODULE_LICENSE("GPL v2");
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