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b49e6eb1c7
These prevent use of this driver with ACPI via PRP0001 and are an example of an anti pattern I'm trying to remove from IIO. Hence drop them from this driver. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Michael Hennerich <michael.hennerich@analog.com> Link: https://lore.kernel.org/r/20200910173242.621168-10-jic23@kernel.org
643 lines
15 KiB
C
643 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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/mod_devicetable.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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#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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* @dev: this 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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* @cached_val: store/retrieve values during power down
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* @pwr_down_mode: power down mode (1k, 100k or tristate)
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* @pwr_down: true if the device is in power down
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* @lock: lock to protect the data buffer during write ops
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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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struct mutex lock;
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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(&st->lock);
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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(&st->lock);
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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(&st->lock);
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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(&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 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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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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mutex_init(&st->lock);
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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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put_unaligned_be24(val, &data[0]);
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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_AD5600,
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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_AD5600] = {
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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_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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{"ad5600", ID_AD5600},
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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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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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static int ad5446_spi_probe(struct spi_device *spi)
|
|
{
|
|
const struct spi_device_id *id = spi_get_device_id(spi);
|
|
|
|
return ad5446_probe(&spi->dev, id->name,
|
|
&ad5446_spi_chip_info[id->driver_data]);
|
|
}
|
|
|
|
static int ad5446_spi_remove(struct spi_device *spi)
|
|
{
|
|
return ad5446_remove(&spi->dev);
|
|
}
|
|
|
|
static struct spi_driver ad5446_spi_driver = {
|
|
.driver = {
|
|
.name = "ad5446",
|
|
.of_match_table = ad5446_of_ids,
|
|
},
|
|
.probe = ad5446_spi_probe,
|
|
.remove = ad5446_spi_remove,
|
|
.id_table = ad5446_spi_ids,
|
|
};
|
|
|
|
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 <michael.hennerich@analog.com>");
|
|
MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
|
|
MODULE_LICENSE("GPL v2");
|