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331 lines
7.7 KiB
331 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver |
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* |
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* Copyright 2010-2011 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/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 <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <asm/unaligned.h> |
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#include "ad5624r.h" |
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static int ad5624r_spi_write(struct spi_device *spi, |
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u8 cmd, u8 addr, u16 val, u8 shift) |
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{ |
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u32 data; |
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u8 msg[3]; |
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/* |
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* The input shift register is 24 bits wide. The first two bits are |
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* don't care bits. The next three are the command bits, C2 to C0, |
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* followed by the 3-bit DAC address, A2 to A0, and then the |
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* 16-, 14-, 12-bit data-word. The data-word comprises the 16-, |
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* 14-, 12-bit input code followed by 0, 2, or 4 don't care bits, |
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* for the AD5664R, AD5644R, and AD5624R, respectively. |
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*/ |
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data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << shift); |
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put_unaligned_be24(data, &msg[0]); |
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return spi_write(spi, msg, sizeof(msg)); |
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} |
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static int ad5624r_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 ad5624r_state *st = iio_priv(indio_dev); |
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switch (m) { |
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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 ad5624r_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 ad5624r_state *st = iio_priv(indio_dev); |
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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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return ad5624r_spi_write(st->us, |
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AD5624R_CMD_WRITE_INPUT_N_UPDATE_N, |
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chan->address, val, |
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chan->scan_type.shift); |
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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 char * const ad5624r_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 ad5624r_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 ad5624r_state *st = iio_priv(indio_dev); |
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return st->pwr_down_mode; |
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} |
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static int ad5624r_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 ad5624r_state *st = iio_priv(indio_dev); |
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st->pwr_down_mode = mode; |
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return 0; |
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} |
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static const struct iio_enum ad5624r_powerdown_mode_enum = { |
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.items = ad5624r_powerdown_modes, |
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.num_items = ARRAY_SIZE(ad5624r_powerdown_modes), |
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.get = ad5624r_get_powerdown_mode, |
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.set = ad5624r_set_powerdown_mode, |
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}; |
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static ssize_t ad5624r_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 ad5624r_state *st = iio_priv(indio_dev); |
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return sysfs_emit(buf, "%d\n", |
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!!(st->pwr_down_mask & (1 << chan->channel))); |
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} |
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static ssize_t ad5624r_write_dac_powerdown(struct iio_dev *indio_dev, |
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uintptr_t private, const struct iio_chan_spec *chan, const char *buf, |
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size_t len) |
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{ |
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bool pwr_down; |
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int ret; |
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struct ad5624r_state *st = iio_priv(indio_dev); |
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ret = strtobool(buf, &pwr_down); |
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if (ret) |
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return ret; |
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if (pwr_down) |
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st->pwr_down_mask |= (1 << chan->channel); |
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else |
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st->pwr_down_mask &= ~(1 << chan->channel); |
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ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0, |
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(st->pwr_down_mode << 4) | |
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st->pwr_down_mask, 16); |
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return ret ? ret : len; |
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} |
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static const struct iio_info ad5624r_info = { |
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.write_raw = ad5624r_write_raw, |
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.read_raw = ad5624r_read_raw, |
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}; |
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static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = { |
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{ |
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.name = "powerdown", |
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.read = ad5624r_read_dac_powerdown, |
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.write = ad5624r_write_dac_powerdown, |
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.shared = IIO_SEPARATE, |
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}, |
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IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, |
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&ad5624r_powerdown_mode_enum), |
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IIO_ENUM_AVAILABLE("powerdown_mode", &ad5624r_powerdown_mode_enum), |
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{ }, |
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}; |
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#define AD5624R_CHANNEL(_chan, _bits) { \ |
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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 = (_chan), \ |
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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 = 16 - (_bits), \ |
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}, \ |
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.ext_info = ad5624r_ext_info, \ |
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} |
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#define DECLARE_AD5624R_CHANNELS(_name, _bits) \ |
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const struct iio_chan_spec _name##_channels[] = { \ |
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AD5624R_CHANNEL(0, _bits), \ |
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AD5624R_CHANNEL(1, _bits), \ |
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AD5624R_CHANNEL(2, _bits), \ |
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AD5624R_CHANNEL(3, _bits), \ |
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} |
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static DECLARE_AD5624R_CHANNELS(ad5624r, 12); |
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static DECLARE_AD5624R_CHANNELS(ad5644r, 14); |
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static DECLARE_AD5624R_CHANNELS(ad5664r, 16); |
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static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = { |
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[ID_AD5624R3] = { |
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.channels = ad5624r_channels, |
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.int_vref_mv = 1250, |
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}, |
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[ID_AD5624R5] = { |
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.channels = ad5624r_channels, |
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.int_vref_mv = 2500, |
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}, |
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[ID_AD5644R3] = { |
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.channels = ad5644r_channels, |
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.int_vref_mv = 1250, |
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}, |
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[ID_AD5644R5] = { |
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.channels = ad5644r_channels, |
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.int_vref_mv = 2500, |
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}, |
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[ID_AD5664R3] = { |
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.channels = ad5664r_channels, |
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.int_vref_mv = 1250, |
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}, |
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[ID_AD5664R5] = { |
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.channels = ad5664r_channels, |
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.int_vref_mv = 2500, |
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}, |
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}; |
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static int ad5624r_probe(struct spi_device *spi) |
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{ |
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struct ad5624r_state *st; |
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struct iio_dev *indio_dev; |
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int ret, voltage_uv = 0; |
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indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
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if (!indio_dev) |
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return -ENOMEM; |
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st = iio_priv(indio_dev); |
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st->reg = devm_regulator_get_optional(&spi->dev, "vref"); |
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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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} else { |
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if (PTR_ERR(st->reg) != -ENODEV) |
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return PTR_ERR(st->reg); |
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/* Backwards compatibility. This naming is not correct */ |
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st->reg = devm_regulator_get_optional(&spi->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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} |
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spi_set_drvdata(spi, indio_dev); |
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st->chip_info = |
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&ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data]; |
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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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st->us = spi; |
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indio_dev->name = spi_get_device_id(spi)->name; |
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indio_dev->info = &ad5624r_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 = AD5624R_DAC_CHANNELS; |
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ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0, |
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!!voltage_uv, 16); |
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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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static int ad5624r_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 ad5624r_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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return 0; |
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} |
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static const struct spi_device_id ad5624r_id[] = { |
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{"ad5624r3", ID_AD5624R3}, |
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{"ad5644r3", ID_AD5644R3}, |
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{"ad5664r3", ID_AD5664R3}, |
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{"ad5624r5", ID_AD5624R5}, |
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{"ad5644r5", ID_AD5644R5}, |
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{"ad5664r5", ID_AD5664R5}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(spi, ad5624r_id); |
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static struct spi_driver ad5624r_driver = { |
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.driver = { |
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.name = "ad5624r", |
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}, |
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.probe = ad5624r_probe, |
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.remove = ad5624r_remove, |
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.id_table = ad5624r_id, |
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}; |
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module_spi_driver(ad5624r_driver); |
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MODULE_AUTHOR("Barry Song <[email protected]>"); |
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MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver"); |
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MODULE_LICENSE("GPL v2");
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