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544 lines
13 KiB
544 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* AD5686R, AD5685R, AD5684R Digital to analog converters driver |
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* |
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* Copyright 2011 Analog Devices Inc. |
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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/module.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/regulator/consumer.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include "ad5686.h" |
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static const char * const ad5686_powerdown_modes[] = { |
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"1kohm_to_gnd", |
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"100kohm_to_gnd", |
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"three_state" |
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}; |
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static int ad5686_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 ad5686_state *st = iio_priv(indio_dev); |
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return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1; |
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} |
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static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, |
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unsigned int mode) |
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{ |
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struct ad5686_state *st = iio_priv(indio_dev); |
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st->pwr_down_mode &= ~(0x3 << (chan->channel * 2)); |
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st->pwr_down_mode |= ((mode + 1) << (chan->channel * 2)); |
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return 0; |
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} |
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static const struct iio_enum ad5686_powerdown_mode_enum = { |
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.items = ad5686_powerdown_modes, |
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.num_items = ARRAY_SIZE(ad5686_powerdown_modes), |
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.get = ad5686_get_powerdown_mode, |
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.set = ad5686_set_powerdown_mode, |
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}; |
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static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev, |
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uintptr_t private, const struct iio_chan_spec *chan, char *buf) |
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{ |
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struct ad5686_state *st = iio_priv(indio_dev); |
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return sprintf(buf, "%d\n", !!(st->pwr_down_mask & |
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(0x3 << (chan->channel * 2)))); |
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} |
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static ssize_t ad5686_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, |
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size_t len) |
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{ |
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bool readin; |
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int ret; |
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struct ad5686_state *st = iio_priv(indio_dev); |
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unsigned int val, ref_bit_msk; |
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u8 shift, address = 0; |
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ret = strtobool(buf, &readin); |
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if (ret) |
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return ret; |
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if (readin) |
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st->pwr_down_mask |= (0x3 << (chan->channel * 2)); |
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else |
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st->pwr_down_mask &= ~(0x3 << (chan->channel * 2)); |
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switch (st->chip_info->regmap_type) { |
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case AD5310_REGMAP: |
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shift = 9; |
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ref_bit_msk = AD5310_REF_BIT_MSK; |
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break; |
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case AD5683_REGMAP: |
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shift = 13; |
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ref_bit_msk = AD5683_REF_BIT_MSK; |
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break; |
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case AD5686_REGMAP: |
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shift = 0; |
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ref_bit_msk = 0; |
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/* AD5674R/AD5679R have 16 channels and 2 powerdown registers */ |
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if (chan->channel > 0x7) |
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address = 0x8; |
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break; |
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case AD5693_REGMAP: |
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shift = 13; |
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ref_bit_msk = AD5693_REF_BIT_MSK; |
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break; |
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default: |
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return -EINVAL; |
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} |
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val = ((st->pwr_down_mask & st->pwr_down_mode) << shift); |
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if (!st->use_internal_vref) |
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val |= ref_bit_msk; |
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ret = st->write(st, AD5686_CMD_POWERDOWN_DAC, |
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address, val >> (address * 2)); |
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return ret ? ret : len; |
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} |
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static int ad5686_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 ad5686_state *st = iio_priv(indio_dev); |
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int ret; |
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switch (m) { |
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case IIO_CHAN_INFO_RAW: |
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mutex_lock(&st->lock); |
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ret = st->read(st, chan->address); |
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mutex_unlock(&st->lock); |
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if (ret < 0) |
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return ret; |
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*val = (ret >> chan->scan_type.shift) & |
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GENMASK(chan->scan_type.realbits - 1, 0); |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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*val = st->vref_mv; |
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*val2 = chan->scan_type.realbits; |
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return IIO_VAL_FRACTIONAL_LOG2; |
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} |
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return -EINVAL; |
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} |
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static int ad5686_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 ad5686_state *st = iio_priv(indio_dev); |
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int ret; |
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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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mutex_lock(&st->lock); |
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ret = st->write(st, |
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AD5686_CMD_WRITE_INPUT_N_UPDATE_N, |
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chan->address, |
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val << chan->scan_type.shift); |
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mutex_unlock(&st->lock); |
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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 ad5686_info = { |
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.read_raw = ad5686_read_raw, |
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.write_raw = ad5686_write_raw, |
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}; |
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static const struct iio_chan_spec_ext_info ad5686_ext_info[] = { |
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{ |
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.name = "powerdown", |
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.read = ad5686_read_dac_powerdown, |
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.write = ad5686_write_dac_powerdown, |
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.shared = IIO_SEPARATE, |
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}, |
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IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum), |
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IIO_ENUM_AVAILABLE("powerdown_mode", &ad5686_powerdown_mode_enum), |
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{ }, |
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}; |
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#define AD5868_CHANNEL(chan, addr, bits, _shift) { \ |
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.type = IIO_VOLTAGE, \ |
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.indexed = 1, \ |
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.output = 1, \ |
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.channel = chan, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\ |
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.address = addr, \ |
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.scan_type = { \ |
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.sign = 'u', \ |
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.realbits = (bits), \ |
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.storagebits = 16, \ |
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.shift = (_shift), \ |
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}, \ |
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.ext_info = ad5686_ext_info, \ |
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} |
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#define DECLARE_AD5693_CHANNELS(name, bits, _shift) \ |
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static const struct iio_chan_spec name[] = { \ |
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AD5868_CHANNEL(0, 0, bits, _shift), \ |
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} |
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#define DECLARE_AD5338_CHANNELS(name, bits, _shift) \ |
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static const struct iio_chan_spec name[] = { \ |
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AD5868_CHANNEL(0, 1, bits, _shift), \ |
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AD5868_CHANNEL(1, 8, bits, _shift), \ |
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} |
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#define DECLARE_AD5686_CHANNELS(name, bits, _shift) \ |
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static const struct iio_chan_spec name[] = { \ |
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AD5868_CHANNEL(0, 1, bits, _shift), \ |
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AD5868_CHANNEL(1, 2, bits, _shift), \ |
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AD5868_CHANNEL(2, 4, bits, _shift), \ |
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AD5868_CHANNEL(3, 8, bits, _shift), \ |
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} |
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#define DECLARE_AD5676_CHANNELS(name, bits, _shift) \ |
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static const struct iio_chan_spec name[] = { \ |
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AD5868_CHANNEL(0, 0, bits, _shift), \ |
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AD5868_CHANNEL(1, 1, bits, _shift), \ |
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AD5868_CHANNEL(2, 2, bits, _shift), \ |
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AD5868_CHANNEL(3, 3, bits, _shift), \ |
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AD5868_CHANNEL(4, 4, bits, _shift), \ |
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AD5868_CHANNEL(5, 5, bits, _shift), \ |
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AD5868_CHANNEL(6, 6, bits, _shift), \ |
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AD5868_CHANNEL(7, 7, bits, _shift), \ |
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} |
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#define DECLARE_AD5679_CHANNELS(name, bits, _shift) \ |
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static const struct iio_chan_spec name[] = { \ |
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AD5868_CHANNEL(0, 0, bits, _shift), \ |
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AD5868_CHANNEL(1, 1, bits, _shift), \ |
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AD5868_CHANNEL(2, 2, bits, _shift), \ |
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AD5868_CHANNEL(3, 3, bits, _shift), \ |
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AD5868_CHANNEL(4, 4, bits, _shift), \ |
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AD5868_CHANNEL(5, 5, bits, _shift), \ |
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AD5868_CHANNEL(6, 6, bits, _shift), \ |
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AD5868_CHANNEL(7, 7, bits, _shift), \ |
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AD5868_CHANNEL(8, 8, bits, _shift), \ |
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AD5868_CHANNEL(9, 9, bits, _shift), \ |
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AD5868_CHANNEL(10, 10, bits, _shift), \ |
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AD5868_CHANNEL(11, 11, bits, _shift), \ |
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AD5868_CHANNEL(12, 12, bits, _shift), \ |
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AD5868_CHANNEL(13, 13, bits, _shift), \ |
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AD5868_CHANNEL(14, 14, bits, _shift), \ |
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AD5868_CHANNEL(15, 15, bits, _shift), \ |
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} |
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DECLARE_AD5693_CHANNELS(ad5310r_channels, 10, 2); |
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DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6); |
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DECLARE_AD5338_CHANNELS(ad5338r_channels, 10, 6); |
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DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4); |
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DECLARE_AD5679_CHANNELS(ad5674r_channels, 12, 4); |
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DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0); |
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DECLARE_AD5679_CHANNELS(ad5679r_channels, 16, 0); |
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DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4); |
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DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2); |
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DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0); |
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DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0); |
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DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2); |
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DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4); |
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static const struct ad5686_chip_info ad5686_chip_info_tbl[] = { |
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[ID_AD5310R] = { |
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.channels = ad5310r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 1, |
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.regmap_type = AD5310_REGMAP, |
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}, |
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[ID_AD5311R] = { |
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.channels = ad5311r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 1, |
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.regmap_type = AD5693_REGMAP, |
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}, |
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[ID_AD5338R] = { |
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.channels = ad5338r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 2, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5671R] = { |
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.channels = ad5672_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 8, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5672R] = { |
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.channels = ad5672_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 8, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5674R] = { |
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.channels = ad5674r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 16, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5675R] = { |
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.channels = ad5676_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 8, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5676] = { |
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.channels = ad5676_channels, |
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.num_channels = 8, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5676R] = { |
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.channels = ad5676_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 8, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5679R] = { |
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.channels = ad5679r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 16, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5681R] = { |
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.channels = ad5691r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 1, |
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.regmap_type = AD5683_REGMAP, |
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}, |
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[ID_AD5682R] = { |
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.channels = ad5692r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 1, |
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.regmap_type = AD5683_REGMAP, |
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}, |
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[ID_AD5683] = { |
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.channels = ad5693_channels, |
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.num_channels = 1, |
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.regmap_type = AD5683_REGMAP, |
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}, |
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[ID_AD5683R] = { |
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.channels = ad5693_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 1, |
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.regmap_type = AD5683_REGMAP, |
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}, |
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[ID_AD5684] = { |
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.channels = ad5684_channels, |
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.num_channels = 4, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5684R] = { |
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.channels = ad5684_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 4, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5685R] = { |
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.channels = ad5685r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 4, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5686] = { |
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.channels = ad5686_channels, |
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.num_channels = 4, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5686R] = { |
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.channels = ad5686_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 4, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5691R] = { |
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.channels = ad5691r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 1, |
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.regmap_type = AD5693_REGMAP, |
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}, |
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[ID_AD5692R] = { |
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.channels = ad5692r_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 1, |
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.regmap_type = AD5693_REGMAP, |
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}, |
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[ID_AD5693] = { |
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.channels = ad5693_channels, |
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.num_channels = 1, |
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.regmap_type = AD5693_REGMAP, |
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}, |
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[ID_AD5693R] = { |
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.channels = ad5693_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 1, |
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.regmap_type = AD5693_REGMAP, |
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}, |
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[ID_AD5694] = { |
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.channels = ad5684_channels, |
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.num_channels = 4, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5694R] = { |
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.channels = ad5684_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 4, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5696] = { |
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.channels = ad5686_channels, |
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.num_channels = 4, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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[ID_AD5696R] = { |
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.channels = ad5686_channels, |
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.int_vref_mv = 2500, |
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.num_channels = 4, |
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.regmap_type = AD5686_REGMAP, |
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}, |
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}; |
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int ad5686_probe(struct device *dev, |
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enum ad5686_supported_device_ids chip_type, |
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const char *name, ad5686_write_func write, |
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ad5686_read_func read) |
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{ |
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struct ad5686_state *st; |
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struct iio_dev *indio_dev; |
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unsigned int val, ref_bit_msk; |
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u8 cmd; |
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int ret, i, voltage_uv = 0; |
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indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); |
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if (indio_dev == NULL) |
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return -ENOMEM; |
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st = iio_priv(indio_dev); |
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dev_set_drvdata(dev, indio_dev); |
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st->dev = dev; |
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st->write = write; |
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st->read = read; |
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st->reg = devm_regulator_get_optional(dev, "vcc"); |
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if (!IS_ERR(st->reg)) { |
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ret = regulator_enable(st->reg); |
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if (ret) |
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return ret; |
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ret = regulator_get_voltage(st->reg); |
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if (ret < 0) |
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goto error_disable_reg; |
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voltage_uv = ret; |
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} |
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st->chip_info = &ad5686_chip_info_tbl[chip_type]; |
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if (voltage_uv) |
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st->vref_mv = voltage_uv / 1000; |
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else |
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st->vref_mv = st->chip_info->int_vref_mv; |
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|
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/* Set all the power down mode for all channels to 1K pulldown */ |
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for (i = 0; i < st->chip_info->num_channels; i++) |
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st->pwr_down_mode |= (0x01 << (i * 2)); |
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indio_dev->name = name; |
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indio_dev->info = &ad5686_info; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = st->chip_info->channels; |
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indio_dev->num_channels = st->chip_info->num_channels; |
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mutex_init(&st->lock); |
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switch (st->chip_info->regmap_type) { |
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case AD5310_REGMAP: |
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cmd = AD5686_CMD_CONTROL_REG; |
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ref_bit_msk = AD5310_REF_BIT_MSK; |
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st->use_internal_vref = !voltage_uv; |
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break; |
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case AD5683_REGMAP: |
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cmd = AD5686_CMD_CONTROL_REG; |
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ref_bit_msk = AD5683_REF_BIT_MSK; |
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st->use_internal_vref = !voltage_uv; |
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break; |
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case AD5686_REGMAP: |
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cmd = AD5686_CMD_INTERNAL_REFER_SETUP; |
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ref_bit_msk = 0; |
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break; |
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case AD5693_REGMAP: |
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cmd = AD5686_CMD_CONTROL_REG; |
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ref_bit_msk = AD5693_REF_BIT_MSK; |
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st->use_internal_vref = !voltage_uv; |
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break; |
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default: |
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ret = -EINVAL; |
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goto error_disable_reg; |
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} |
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val = (voltage_uv | ref_bit_msk); |
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ret = st->write(st, cmd, 0, !!val); |
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if (ret) |
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goto error_disable_reg; |
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ret = iio_device_register(indio_dev); |
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if (ret) |
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goto error_disable_reg; |
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return 0; |
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error_disable_reg: |
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if (!IS_ERR(st->reg)) |
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regulator_disable(st->reg); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(ad5686_probe); |
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int ad5686_remove(struct device *dev) |
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{ |
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struct iio_dev *indio_dev = dev_get_drvdata(dev); |
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struct ad5686_state *st = iio_priv(indio_dev); |
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|
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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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|
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ad5686_remove); |
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|
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MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
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MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC"); |
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MODULE_LICENSE("GPL v2");
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