v4.19.13 snapshot.
diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
new file mode 100644
index 0000000..2ddbfc3
--- /dev/null
+++ b/drivers/iio/dac/ad5686.c
@@ -0,0 +1,475 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AD5686R, AD5685R, AD5684R Digital to analog converters driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "ad5686.h"
+
+static const char * const ad5686_powerdown_modes[] = {
+ "1kohm_to_gnd",
+ "100kohm_to_gnd",
+ "three_state"
+};
+
+static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct ad5686_state *st = iio_priv(indio_dev);
+
+ return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1;
+}
+
+static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int mode)
+{
+ struct ad5686_state *st = iio_priv(indio_dev);
+
+ st->pwr_down_mode &= ~(0x3 << (chan->channel * 2));
+ st->pwr_down_mode |= ((mode + 1) << (chan->channel * 2));
+
+ return 0;
+}
+
+static const struct iio_enum ad5686_powerdown_mode_enum = {
+ .items = ad5686_powerdown_modes,
+ .num_items = ARRAY_SIZE(ad5686_powerdown_modes),
+ .get = ad5686_get_powerdown_mode,
+ .set = ad5686_set_powerdown_mode,
+};
+
+static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,
+ uintptr_t private, const struct iio_chan_spec *chan, char *buf)
+{
+ struct ad5686_state *st = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n", !!(st->pwr_down_mask &
+ (0x3 << (chan->channel * 2))));
+}
+
+static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
+ uintptr_t private,
+ const struct iio_chan_spec *chan,
+ const char *buf,
+ size_t len)
+{
+ bool readin;
+ int ret;
+ struct ad5686_state *st = iio_priv(indio_dev);
+ unsigned int val, ref_bit_msk;
+ u8 shift;
+
+ ret = strtobool(buf, &readin);
+ if (ret)
+ return ret;
+
+ if (readin)
+ st->pwr_down_mask |= (0x3 << (chan->channel * 2));
+ else
+ st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));
+
+ switch (st->chip_info->regmap_type) {
+ case AD5683_REGMAP:
+ shift = 13;
+ ref_bit_msk = AD5683_REF_BIT_MSK;
+ break;
+ case AD5686_REGMAP:
+ shift = 0;
+ ref_bit_msk = 0;
+ break;
+ case AD5693_REGMAP:
+ shift = 13;
+ ref_bit_msk = AD5693_REF_BIT_MSK;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ val = ((st->pwr_down_mask & st->pwr_down_mode) << shift);
+ if (!st->use_internal_vref)
+ val |= ref_bit_msk;
+
+ ret = st->write(st, AD5686_CMD_POWERDOWN_DAC, 0, val);
+
+ return ret ? ret : len;
+}
+
+static int ad5686_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
+{
+ struct ad5686_state *st = iio_priv(indio_dev);
+ int ret;
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&indio_dev->mlock);
+ ret = st->read(st, chan->address);
+ mutex_unlock(&indio_dev->mlock);
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = st->vref_mv;
+ *val2 = chan->scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+ return -EINVAL;
+}
+
+static int ad5686_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct ad5686_state *st = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (val > (1 << chan->scan_type.realbits) || val < 0)
+ return -EINVAL;
+
+ mutex_lock(&indio_dev->mlock);
+ ret = st->write(st,
+ AD5686_CMD_WRITE_INPUT_N_UPDATE_N,
+ chan->address,
+ val << chan->scan_type.shift);
+ mutex_unlock(&indio_dev->mlock);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static const struct iio_info ad5686_info = {
+ .read_raw = ad5686_read_raw,
+ .write_raw = ad5686_write_raw,
+};
+
+static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
+ {
+ .name = "powerdown",
+ .read = ad5686_read_dac_powerdown,
+ .write = ad5686_write_dac_powerdown,
+ .shared = IIO_SEPARATE,
+ },
+ IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum),
+ IIO_ENUM_AVAILABLE("powerdown_mode", &ad5686_powerdown_mode_enum),
+ { },
+};
+
+#define AD5868_CHANNEL(chan, addr, bits, _shift) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .output = 1, \
+ .channel = chan, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
+ .address = addr, \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = (bits), \
+ .storagebits = 16, \
+ .shift = (_shift), \
+ }, \
+ .ext_info = ad5686_ext_info, \
+}
+
+#define DECLARE_AD5693_CHANNELS(name, bits, _shift) \
+static struct iio_chan_spec name[] = { \
+ AD5868_CHANNEL(0, 0, bits, _shift), \
+}
+
+#define DECLARE_AD5686_CHANNELS(name, bits, _shift) \
+static struct iio_chan_spec name[] = { \
+ AD5868_CHANNEL(0, 1, bits, _shift), \
+ AD5868_CHANNEL(1, 2, bits, _shift), \
+ AD5868_CHANNEL(2, 4, bits, _shift), \
+ AD5868_CHANNEL(3, 8, bits, _shift), \
+}
+
+#define DECLARE_AD5676_CHANNELS(name, bits, _shift) \
+static struct iio_chan_spec name[] = { \
+ AD5868_CHANNEL(0, 0, bits, _shift), \
+ AD5868_CHANNEL(1, 1, bits, _shift), \
+ AD5868_CHANNEL(2, 2, bits, _shift), \
+ AD5868_CHANNEL(3, 3, bits, _shift), \
+ AD5868_CHANNEL(4, 4, bits, _shift), \
+ AD5868_CHANNEL(5, 5, bits, _shift), \
+ AD5868_CHANNEL(6, 6, bits, _shift), \
+ AD5868_CHANNEL(7, 7, bits, _shift), \
+}
+
+DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);
+DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
+DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
+DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
+DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
+DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
+DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0);
+DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);
+DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);
+
+static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
+ [ID_AD5311R] = {
+ .channels = ad5311r_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 1,
+ .regmap_type = AD5693_REGMAP,
+ },
+ [ID_AD5671R] = {
+ .channels = ad5672_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 8,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5672R] = {
+ .channels = ad5672_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 8,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5675R] = {
+ .channels = ad5676_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 8,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5676] = {
+ .channels = ad5676_channels,
+ .num_channels = 8,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5676R] = {
+ .channels = ad5676_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 8,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5681R] = {
+ .channels = ad5691r_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 1,
+ .regmap_type = AD5683_REGMAP,
+ },
+ [ID_AD5682R] = {
+ .channels = ad5692r_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 1,
+ .regmap_type = AD5683_REGMAP,
+ },
+ [ID_AD5683] = {
+ .channels = ad5693_channels,
+ .num_channels = 1,
+ .regmap_type = AD5683_REGMAP,
+ },
+ [ID_AD5683R] = {
+ .channels = ad5693_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 1,
+ .regmap_type = AD5683_REGMAP,
+ },
+ [ID_AD5684] = {
+ .channels = ad5684_channels,
+ .num_channels = 4,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5684R] = {
+ .channels = ad5684_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 4,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5685R] = {
+ .channels = ad5685r_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 4,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5686] = {
+ .channels = ad5686_channels,
+ .num_channels = 4,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5686R] = {
+ .channels = ad5686_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 4,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5691R] = {
+ .channels = ad5691r_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 1,
+ .regmap_type = AD5693_REGMAP,
+ },
+ [ID_AD5692R] = {
+ .channels = ad5692r_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 1,
+ .regmap_type = AD5693_REGMAP,
+ },
+ [ID_AD5693] = {
+ .channels = ad5693_channels,
+ .num_channels = 1,
+ .regmap_type = AD5693_REGMAP,
+ },
+ [ID_AD5693R] = {
+ .channels = ad5693_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 1,
+ .regmap_type = AD5693_REGMAP,
+ },
+ [ID_AD5694] = {
+ .channels = ad5684_channels,
+ .num_channels = 4,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5694R] = {
+ .channels = ad5684_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 4,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5696] = {
+ .channels = ad5686_channels,
+ .num_channels = 4,
+ .regmap_type = AD5686_REGMAP,
+ },
+ [ID_AD5696R] = {
+ .channels = ad5686_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 4,
+ .regmap_type = AD5686_REGMAP,
+ },
+};
+
+int ad5686_probe(struct device *dev,
+ enum ad5686_supported_device_ids chip_type,
+ const char *name, ad5686_write_func write,
+ ad5686_read_func read)
+{
+ struct ad5686_state *st;
+ struct iio_dev *indio_dev;
+ unsigned int val, ref_bit_msk;
+ u8 cmd;
+ int ret, i, voltage_uv = 0;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+ if (indio_dev == NULL)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ dev_set_drvdata(dev, indio_dev);
+
+ st->dev = dev;
+ st->write = write;
+ st->read = read;
+
+ st->reg = devm_regulator_get_optional(dev, "vcc");
+ if (!IS_ERR(st->reg)) {
+ ret = regulator_enable(st->reg);
+ if (ret)
+ return ret;
+
+ ret = regulator_get_voltage(st->reg);
+ if (ret < 0)
+ goto error_disable_reg;
+
+ voltage_uv = ret;
+ }
+
+ st->chip_info = &ad5686_chip_info_tbl[chip_type];
+
+ if (voltage_uv)
+ st->vref_mv = voltage_uv / 1000;
+ else
+ st->vref_mv = st->chip_info->int_vref_mv;
+
+ /* Set all the power down mode for all channels to 1K pulldown */
+ for (i = 0; i < st->chip_info->num_channels; i++)
+ st->pwr_down_mode |= (0x01 << (i * 2));
+
+ indio_dev->dev.parent = dev;
+ indio_dev->name = name;
+ indio_dev->info = &ad5686_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = st->chip_info->channels;
+ indio_dev->num_channels = st->chip_info->num_channels;
+
+ switch (st->chip_info->regmap_type) {
+ case AD5683_REGMAP:
+ cmd = AD5686_CMD_CONTROL_REG;
+ ref_bit_msk = AD5683_REF_BIT_MSK;
+ st->use_internal_vref = !voltage_uv;
+ break;
+ case AD5686_REGMAP:
+ cmd = AD5686_CMD_INTERNAL_REFER_SETUP;
+ ref_bit_msk = 0;
+ break;
+ case AD5693_REGMAP:
+ cmd = AD5686_CMD_CONTROL_REG;
+ ref_bit_msk = AD5693_REF_BIT_MSK;
+ st->use_internal_vref = !voltage_uv;
+ break;
+ default:
+ ret = -EINVAL;
+ goto error_disable_reg;
+ }
+
+ val = (voltage_uv | ref_bit_msk);
+
+ ret = st->write(st, cmd, 0, !!val);
+ if (ret)
+ goto error_disable_reg;
+
+ ret = iio_device_register(indio_dev);
+ if (ret)
+ goto error_disable_reg;
+
+ return 0;
+
+error_disable_reg:
+ if (!IS_ERR(st->reg))
+ regulator_disable(st->reg);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ad5686_probe);
+
+int ad5686_remove(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad5686_state *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ if (!IS_ERR(st->reg))
+ regulator_disable(st->reg);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ad5686_remove);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");
+MODULE_LICENSE("GPL v2");