634 lines
14 KiB
C
634 lines
14 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/i2c.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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#define MODE_PWRDWN_1k 0x1
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#define MODE_PWRDWN_100k 0x2
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#define MODE_PWRDWN_TRISTATE 0x3
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/**
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* struct ad5446_state - driver instance specific data
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* @spi: spi_device
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* @chip_info: chip model specific constants, available modes etc
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* @reg: supply regulator
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* @vref_mv: actual reference voltage used
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*/
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struct ad5446_state {
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struct device *dev;
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const struct ad5446_chip_info *chip_info;
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struct regulator *reg;
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unsigned short vref_mv;
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unsigned cached_val;
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unsigned pwr_down_mode;
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unsigned pwr_down;
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};
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/**
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* struct ad5446_chip_info - chip specific information
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* @channel: channel spec for the DAC
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* @int_vref_mv: AD5620/40/60: the internal reference voltage
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* @write: chip specific helper function to write to the register
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*/
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struct ad5446_chip_info {
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struct iio_chan_spec channel;
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u16 int_vref_mv;
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int (*write)(struct ad5446_state *st, unsigned val);
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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 ad5446_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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.shared = IIO_SEPARATE,
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},
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IIO_ENUM("powerdown_mode", IIO_SEPARATE, &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_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.scan_type = { \
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.sign = 'u', \
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.realbits = (bits), \
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.storagebits = (storage), \
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.shift = (_shift), \
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}, \
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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, ad5446_ext_info_powerdown)
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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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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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*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 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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};
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static int ad5446_probe(struct device *dev, const char *name,
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const struct ad5446_chip_info *chip_info)
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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 = devm_regulator_get(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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return ret;
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ret = regulator_get_voltage(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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indio_dev = devm_iio_device_alloc(dev, 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 = chip_info;
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dev_set_drvdata(dev, indio_dev);
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st->reg = reg;
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st->dev = dev;
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/* Establish that the iio_dev is a child of the device */
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indio_dev->dev.parent = dev;
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indio_dev->name = 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(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_disable_reg;
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return 0;
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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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return ret;
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}
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static int ad5446_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 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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return 0;
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}
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#if IS_ENABLED(CONFIG_SPI_MASTER)
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static int ad5446_write(struct ad5446_state *st, unsigned val)
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{
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struct spi_device *spi = to_spi_device(st->dev);
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__be16 data = cpu_to_be16(val);
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return spi_write(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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struct spi_device *spi = to_spi_device(st->dev);
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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(spi, data, sizeof(data));
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}
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/**
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* ad5446_supported_spi_device_ids:
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* The AD5620/40/60 parts are available in different fixed internal reference
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* voltage options. The actual part numbers may look differently
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* (and a bit cryptic), however this style is used to make clear which
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* parts are supported here.
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*/
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enum ad5446_supported_spi_device_ids {
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ID_AD5300,
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ID_AD5310,
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ID_AD5320,
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ID_AD5444,
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ID_AD5446,
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ID_AD5450,
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ID_AD5451,
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ID_AD5541A,
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ID_AD5512A,
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ID_AD5553,
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ID_AD5601,
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ID_AD5611,
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ID_AD5621,
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ID_AD5641,
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ID_AD5620_2500,
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ID_AD5620_1250,
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ID_AD5640_2500,
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ID_AD5640_1250,
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ID_AD5660_2500,
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ID_AD5660_1250,
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ID_AD5662,
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};
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static const struct ad5446_chip_info ad5446_spi_chip_info[] = {
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[ID_AD5300] = {
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.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
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.write = ad5446_write,
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},
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[ID_AD5310] = {
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.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
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.write = ad5446_write,
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},
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[ID_AD5320] = {
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.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
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.write = ad5446_write,
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},
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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_AD5450] = {
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.channel = AD5446_CHANNEL(8, 16, 6),
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.write = ad5446_write,
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},
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[ID_AD5451] = {
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.channel = AD5446_CHANNEL(10, 16, 4),
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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_AD5641] = {
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.channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
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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 const struct spi_device_id ad5446_spi_ids[] = {
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{"ad5300", ID_AD5300},
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{"ad5310", ID_AD5310},
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{"ad5320", ID_AD5320},
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{"ad5444", ID_AD5444},
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{"ad5446", ID_AD5446},
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{"ad5450", ID_AD5450},
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{"ad5451", ID_AD5451},
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{"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */
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{"ad5453", ID_AD5446}, /* ad5453 is compatible to the 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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{"ad5641", ID_AD5641},
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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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{"dac081s101", ID_AD5300}, /* compatible Texas Instruments chips */
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{"dac101s101", ID_AD5310},
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{"dac121s101", ID_AD5320},
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{"dac7512", ID_AD5320},
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{}
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};
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MODULE_DEVICE_TABLE(spi, ad5446_spi_ids);
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#ifdef CONFIG_OF
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static const struct of_device_id ad5446_of_ids[] = {
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{ .compatible = "ti,dac7512" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ad5446_of_ids);
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#endif
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static int ad5446_spi_probe(struct spi_device *spi)
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{
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const struct spi_device_id *id = spi_get_device_id(spi);
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return ad5446_probe(&spi->dev, id->name,
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&ad5446_spi_chip_info[id->driver_data]);
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}
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static int ad5446_spi_remove(struct spi_device *spi)
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{
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return ad5446_remove(&spi->dev);
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}
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static struct spi_driver ad5446_spi_driver = {
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.driver = {
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.name = "ad5446",
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.of_match_table = of_match_ptr(ad5446_of_ids),
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},
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.probe = ad5446_spi_probe,
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.remove = ad5446_spi_remove,
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.id_table = ad5446_spi_ids,
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};
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|
|
|
static int __init ad5446_spi_register_driver(void)
|
|
{
|
|
return spi_register_driver(&ad5446_spi_driver);
|
|
}
|
|
|
|
static void ad5446_spi_unregister_driver(void)
|
|
{
|
|
spi_unregister_driver(&ad5446_spi_driver);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int ad5446_spi_register_driver(void) { return 0; }
|
|
static inline void ad5446_spi_unregister_driver(void) { }
|
|
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_I2C)
|
|
|
|
static int ad5622_write(struct ad5446_state *st, unsigned val)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(st->dev);
|
|
__be16 data = cpu_to_be16(val);
|
|
|
|
return i2c_master_send(client, (char *)&data, sizeof(data));
|
|
}
|
|
|
|
/**
|
|
* ad5446_supported_i2c_device_ids:
|
|
* The AD5620/40/60 parts are available in different fixed internal reference
|
|
* voltage options. The actual part numbers may look differently
|
|
* (and a bit cryptic), however this style is used to make clear which
|
|
* parts are supported here.
|
|
*/
|
|
enum ad5446_supported_i2c_device_ids {
|
|
ID_AD5602,
|
|
ID_AD5612,
|
|
ID_AD5622,
|
|
};
|
|
|
|
static const struct ad5446_chip_info ad5446_i2c_chip_info[] = {
|
|
[ID_AD5602] = {
|
|
.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
|
|
.write = ad5622_write,
|
|
},
|
|
[ID_AD5612] = {
|
|
.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
|
|
.write = ad5622_write,
|
|
},
|
|
[ID_AD5622] = {
|
|
.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
|
|
.write = ad5622_write,
|
|
},
|
|
};
|
|
|
|
static int ad5446_i2c_probe(struct i2c_client *i2c,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
return ad5446_probe(&i2c->dev, id->name,
|
|
&ad5446_i2c_chip_info[id->driver_data]);
|
|
}
|
|
|
|
static int ad5446_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
return ad5446_remove(&i2c->dev);
|
|
}
|
|
|
|
static const struct i2c_device_id ad5446_i2c_ids[] = {
|
|
{"ad5301", ID_AD5602},
|
|
{"ad5311", ID_AD5612},
|
|
{"ad5321", ID_AD5622},
|
|
{"ad5602", ID_AD5602},
|
|
{"ad5612", ID_AD5612},
|
|
{"ad5622", ID_AD5622},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids);
|
|
|
|
static struct i2c_driver ad5446_i2c_driver = {
|
|
.driver = {
|
|
.name = "ad5446",
|
|
},
|
|
.probe = ad5446_i2c_probe,
|
|
.remove = ad5446_i2c_remove,
|
|
.id_table = ad5446_i2c_ids,
|
|
};
|
|
|
|
static int __init ad5446_i2c_register_driver(void)
|
|
{
|
|
return i2c_add_driver(&ad5446_i2c_driver);
|
|
}
|
|
|
|
static void __exit ad5446_i2c_unregister_driver(void)
|
|
{
|
|
i2c_del_driver(&ad5446_i2c_driver);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int ad5446_i2c_register_driver(void) { return 0; }
|
|
static inline void ad5446_i2c_unregister_driver(void) { }
|
|
|
|
#endif
|
|
|
|
static int __init ad5446_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = ad5446_spi_register_driver();
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ad5446_i2c_register_driver();
|
|
if (ret) {
|
|
ad5446_spi_unregister_driver();
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
module_init(ad5446_init);
|
|
|
|
static void __exit ad5446_exit(void)
|
|
{
|
|
ad5446_i2c_unregister_driver();
|
|
ad5446_spi_unregister_driver();
|
|
}
|
|
module_exit(ad5446_exit);
|
|
|
|
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
|
MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
|
|
MODULE_LICENSE("GPL v2");
|