[PATCH v3 1/2] iio: dac: ad5770r: Add AD5770R support

From: Alexandru Tachici
Date: Thu Feb 13 2020 - 06:39:55 EST

The AD5770R is a 6-channel, 14-bit resolution, low noise, programmable
current output digital-to-analog converter (DAC) for photonics control
applications.

It contains five 14-bit resolution current sourcing DAC channels and one
14-bit resolution current sourcing/sinking DAC channel.

Signed-off-by: Mircea Caprioru <mircea.caprioru@xxxxxxxxxx>
Signed-off-by: Alexandru Tachici <alexandru.tachici@xxxxxxxxxx>
---
drivers/iio/dac/Kconfig | 10 +
drivers/iio/dac/Makefile | 1 +
drivers/iio/dac/ad5770r.c | 695 ++++++++++++++++++++++++++++++++++++++
3 files changed, 706 insertions(+)
create mode 100644 drivers/iio/dac/ad5770r.c

diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 979070196da9..c74f2151ee42 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -208,6 +208,16 @@ config AD5764
To compile this driver as a module, choose M here: the
module will be called ad5764.

+config AD5770R
+ tristate "Analog Devices AD5770R IDAC driver"
+ depends on SPI_MASTER
+ help
+ Say yes here to build support for Analog Devices AD5770R Digital to
+ Analog Converter.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad5770r.
+
config AD5791
tristate "Analog Devices AD5760/AD5780/AD5781/AD5790/AD5791 DAC SPI driver"
depends on SPI
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index 1369fa1d2f0e..2fc481167724 100644
--- a/drivers/iio/dac/Makefile
+++ b/drivers/iio/dac/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_AD5755) += ad5755.o
obj-$(CONFIG_AD5755) += ad5758.o
obj-$(CONFIG_AD5761) += ad5761.o
obj-$(CONFIG_AD5764) += ad5764.o
+obj-$(CONFIG_AD5770R) += ad5770r.o
obj-$(CONFIG_AD5791) += ad5791.o
obj-$(CONFIG_AD5686) += ad5686.o
obj-$(CONFIG_AD5686_SPI) += ad5686-spi.o
diff --git a/drivers/iio/dac/ad5770r.c b/drivers/iio/dac/ad5770r.c
new file mode 100644
index 000000000000..7765310b074a
--- /dev/null
+++ b/drivers/iio/dac/ad5770r.c
@@ -0,0 +1,695 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AD5770R Digital to analog converters driver
+ *
+ * Copyright 2018 Analog Devices Inc.
+ */
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/common/adi_spi_regs.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#define ADI_SPI_IF_CONFIG_A 0x00
+#define ADI_SPI_IF_CONFIG_B 0x01
+#define ADI_SPI_IF_DEVICE_CONFIG 0x02
+#define ADI_SPI_IF_CHIP_TYPE 0x03
+#define ADI_SPI_IF_PRODUCT_ID_L 0x04
+#define ADI_SPI_IF_PRODUCT_ID_H 0x05
+#define ADI_SPI_IF_CHIP_GRADE 0x06
+#define ADI_SPI_IF_SCRACTH_PAD 0x0A
+#define ADI_SPI_IF_SPI_REVISION 0x0B
+#define ADI_SPI_IF_SPI_VENDOR_L 0x0C
+#define ADI_SPI_IF_SPI_VENDOR_H 0x0D
+#define ADI_SPI_IF_SPI_STREAM_MODE 0x0E
+#define ADI_SPI_IF_CONFIG_C 0x10
+#define ADI_SPI_IF_STATUS_A 0x11
+
+/* ADI_SPI_IF_CONFIG_A */
+#define ADI_SPI_IF_SW_RESET_MSK (BIT(0) | BIT(7))
+#define ADI_SPI_IF_SW_RESET_SEL(x) ((x) & ADI_SPI_IF_SW_RESET_MSK)
+#define ADI_SPI_IF_ADDR_ASC_MSK (BIT(2) | BIT(5))
+#define ADI_SPI_IF_ADDR_ASC_SEL(x) (((x) << 2) & ADI_SPI_IF_ADDR_ASC_MSK)
+
+/* ADI_SPI_IF_CONFIG_B */
+#define ADI_SPI_IF_SINGLE_INS_MSK BIT(7)
+#define ADI_SPI_IF_SINGLE_INS_SEL(x) FIELD_PREP(ADI_SPI_IF_SINGLE_INS_MSK, x)
+#define ADI_SPI_IF_SHORT_INS_MSK BIT(7)
+#define ADI_SPI_IF_SHORT_INS_SEL(x) FIELD_PREP(ADI_SPI_IF_SINGLE_INS_MSK, x)
+
+/* ADI_SPI_IF_CONFIG_C */
+#define ADI_SPI_IF_STRICT_REG_MSK BIT(5)
+#define ADI_SPI_IF_STRICT_REG_GET(x) FIELD_GET(ADI_SPI_IF_STRICT_REG_MSK, x)
+
+/* AD5770R configuration registers */
+#define AD5770R_CHANNEL_CONFIG 0x14
+#define AD5770R_OUTPUT_RANGE(ch) (0x15 + (ch))
+#define AD5770R_FILTER_RESISTOR(ch) (0x1D + (ch))
+#define AD5770R_REFERENCE 0x1B
+#define AD5770R_DAC_LSB(ch) (0x26 + 2 * (ch))
+#define AD5770R_DAC_MSB(ch) (0x27 + 2 * (ch))
+#define AD5770R_CH_SELECT 0x34
+#define AD5770R_CH_ENABLE 0x44
+
+/* AD5770R_CHANNEL_CONFIG */
+#define AD5770R_CFG_CH0_SINK_EN(x) (((x) & 0x1) << 7)
+#define AD5770R_CFG_SHUTDOWN_B(x, ch) (((x) & 0x1) << (ch))
+
+/* AD5770R_OUTPUT_RANGE */
+#define AD5770R_RANGE_OUTPUT_SCALING(x) (((x) & 0x3F) << 2)
+#define AD5770R_RANGE_MODE(x) ((x) & 0x03)
+
+/* AD5770R_REFERENCE */
+#define AD5770R_REF_RESISTOR_SEL(x) (((x) & 0x1) << 2)
+#define AD5770R_REF_SEL(x) (((x) & 0x3) << 0)
+
+/* AD5770R_CH_ENABLE */
+#define AD5770R_CH_SET(x, channel) (((x) & 0x1) << (channel))
+
+#define AD5770R_MAX_CHANNELS 6
+#define AD5770R_MAX_CH_MODES 14
+#define AD5770R_LOW_VREF_mV 1250
+#define AD5770R_HIGH_VREF_mV 2500
+
+enum ad5770r_ch0_modes {
+ AD5770R_CH0_0_300 = 0,
+ AD5770R_CH0_NEG_60_0,
+ AD5770R_CH0_NEG_60_300
+};
+
+enum ad5770r_ch1_modes {
+ AD5770R_CH1_0_140_LOW_HEAD = 1,
+ AD5770R_CH1_0_140_LOW_NOISE,
+ AD5770R_CH1_0_250
+};
+
+enum ad5770r_ch2_5_modes {
+ AD5770R_CH_LOW_RANGE = 0,
+ AD5770R_CH_HIGH_RANGE
+};
+
+enum ad5770r_ref_v {
+ AD5770R_EXT_2_5_V = 0,
+ AD5770R_INT_1_25_V_OUT_ON,
+ AD5770R_EXT_1_25_V,
+ AD5770R_INT_1_25_V_OUT_OFF
+};
+
+enum ad5770r_output_filter_resistor {
+ AD5770R_FILTER_60_OHM = 0x0,
+ AD5770R_FILTER_5_6_KOHM = 0x5,
+ AD5770R_FILTER_11_2_KOHM,
+ AD5770R_FILTER_22_2_KOHM,
+ AD5770R_FILTER_44_4_KOHM,
+ AD5770R_FILTER_104_KOHM,
+};
+
+struct ad5770r_out_range {
+ u8 out_scale;
+ u8 out_range_mode;
+};
+
+/**
+ * struct ad5770R_state - driver instance specific data
+ * @spi: spi_device
+ * @regmap: regmap
+ * @vref_reg: fixed regulator for reference configuration
+ * @gpio_reset: gpio descriptor
+ * @output_mode: array contains channels output ranges
+ * @vref: reference value
+ * @ch_pwr_down: powerdown flags
+ * @internal_ref: internal reference flag
+ * @external_res: external 2.5k resistor flag
+ */
+struct ad5770r_state {
+ struct spi_device *spi;
+ struct regmap *regmap;
+ struct regulator *vref_reg;
+ struct gpio_desc *gpio_reset;
+ struct ad5770r_out_range output_mode[AD5770R_MAX_CHANNELS];
+ int vref;
+ bool ch_pwr_down[AD5770R_MAX_CHANNELS];
+ bool internal_ref;
+ bool external_res;
+};
+
+static const struct regmap_config ad5770r_spi_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .read_flag_mask = BIT(7),
+};
+
+struct ad5770r_output_modes {
+ unsigned int ch;
+ u8 mode;
+ int min;
+ int max;
+};
+
+static struct ad5770r_output_modes ad5770r_rng_tbl[] = {
+ { 0, AD5770R_CH0_0_300, 0, 300 },
+ { 0, AD5770R_CH0_NEG_60_0, -60, 0 },
+ { 0, AD5770R_CH0_NEG_60_300, -60, 300 },
+ { 1, AD5770R_CH1_0_140_LOW_HEAD, 0, 140 },
+ { 1, AD5770R_CH1_0_140_LOW_NOISE, 0, 140 },
+ { 1, AD5770R_CH1_0_250, 0, 250 },
+ { 2, AD5770R_CH_LOW_RANGE, 0, 55 },
+ { 2, AD5770R_CH_HIGH_RANGE, 0, 150 },
+ { 3, AD5770R_CH_LOW_RANGE, 0, 45 },
+ { 3, AD5770R_CH_HIGH_RANGE, 0, 100 },
+ { 4, AD5770R_CH_LOW_RANGE, 0, 45 },
+ { 4, AD5770R_CH_HIGH_RANGE, 0, 100 },
+ { 5, AD5770R_CH_LOW_RANGE, 0, 45 },
+ { 5, AD5770R_CH_HIGH_RANGE, 0, 100 },
+};
+
+static const unsigned int ad5770r_filter_freqs[] = {
+ 153, 357, 715, 1400, 2800, 262000,
+};
+
+static const unsigned int ad5770r_filter_reg_vals[] = {
+ AD5770R_FILTER_104_KOHM,
+ AD5770R_FILTER_44_4_KOHM,
+ AD5770R_FILTER_22_2_KOHM,
+ AD5770R_FILTER_11_2_KOHM,
+ AD5770R_FILTER_5_6_KOHM,
+ AD5770R_FILTER_60_OHM
+};
+
+static int ad5770r_set_output_mode(struct ad5770r_state *st,
+ const struct ad5770r_out_range *out_mode,
+ int channel)
+{
+ unsigned int regval;
+
+ regval = AD5770R_RANGE_OUTPUT_SCALING(out_mode->out_scale) |
+ AD5770R_RANGE_MODE(out_mode->out_range_mode);
+
+ return regmap_write(st->regmap,
+ AD5770R_OUTPUT_RANGE(channel), regval);
+}
+
+static int ad5770r_set_reference(struct ad5770r_state *st)
+{
+ unsigned int regval;
+
+ regval = AD5770R_REF_RESISTOR_SEL(st->external_res);
+
+ if (st->internal_ref) {
+ regval |= AD5770R_REF_SEL(AD5770R_INT_1_25_V_OUT_OFF);
+ } else {
+ switch (st->vref) {
+ case AD5770R_LOW_VREF_mV:
+ regval |= AD5770R_REF_SEL(AD5770R_EXT_1_25_V);
+ break;
+ case AD5770R_HIGH_VREF_mV:
+ regval |= AD5770R_REF_SEL(AD5770R_EXT_2_5_V);
+ break;
+ default:
+ regval = AD5770R_REF_SEL(AD5770R_INT_1_25_V_OUT_OFF);
+ break;
+ }
+ }
+
+ return regmap_write(st->regmap, AD5770R_REFERENCE, regval);
+}
+
+static int ad5770r_soft_reset(struct ad5770r_state *st)
+{
+ return regmap_write(st->regmap, ADI_SPI_IF_CONFIG_A,
+ ADI_SPI_IF_SW_RESET_SEL(1));
+}
+
+static int ad5770r_reset(struct ad5770r_state *st)
+{
+ /* Perform software reset if no GPIO provided */
+ if (!st->gpio_reset)
+ return ad5770r_soft_reset(st);
+
+ gpiod_set_value_cansleep(st->gpio_reset, 0);
+ usleep_range(10, 20);
+ gpiod_set_value_cansleep(st->gpio_reset, 1);
+
+ /* data must not be written during reset timeframe */
+ usleep_range(100, 200);
+
+ return 0;
+}
+
+static int ad5770r_get_range(struct ad5770r_state *st,
+ int ch, int *min, int *max)
+{
+ int i;
+ u8 tbl_ch, tbl_mode, out_range;
+
+ out_range = st->output_mode[ch].out_range_mode;
+
+ for (i = 0; i < AD5770R_MAX_CH_MODES; i++) {
+ tbl_ch = ad5770r_rng_tbl[i].ch;
+ tbl_mode = ad5770r_rng_tbl[i].mode;
+ if (tbl_ch == ch && tbl_mode == out_range) {
+ *min = ad5770r_rng_tbl[i].min;
+ *max = ad5770r_rng_tbl[i].max;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int ad5770r_get_filter_freq(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, int *freq)
+{
+ struct ad5770r_state *st = iio_priv(indio_dev);
+ int ret;
+ unsigned int regval, i;
+
+ ret = regmap_read(st->regmap,
+ AD5770R_FILTER_RESISTOR(chan->channel), &regval);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(ad5770r_filter_reg_vals); i++)
+ if (regval == ad5770r_filter_reg_vals[i])
+ break;
+ if (i == ARRAY_SIZE(ad5770r_filter_reg_vals))
+ return -EINVAL;
+
+ *freq = ad5770r_filter_freqs[i];
+
+ return IIO_VAL_INT;
+}
+
+static int ad5770r_set_filter_freq(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int freq)
+{
+ struct ad5770r_state *st = iio_priv(indio_dev);
+ unsigned int regval, i;
+
+ for (i = 0; i < ARRAY_SIZE(ad5770r_filter_freqs); i++)
+ if (ad5770r_filter_freqs[i] >= freq)
+ break;
+ if (i == ARRAY_SIZE(ad5770r_filter_freqs))
+ return -EINVAL;
+
+ regval = ad5770r_filter_reg_vals[i];
+
+ return regmap_write(st->regmap, AD5770R_FILTER_RESISTOR(chan->channel),
+ regval);
+}
+
+static int ad5770r_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long info)
+{
+ struct ad5770r_state *st = iio_priv(indio_dev);
+ int max, min, ret;
+ __le16 buf16;
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ ret = regmap_bulk_read(st->regmap,
+ chan->address,
+ &buf16, 2);
+ if (ret)
+ return 0;
+ *val = le16_to_cpu(buf16) >> 2;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ ret = ad5770r_get_range(st, chan->channel, &min, &max);
+ if (ret < 0)
+ return ret;
+ *val = max - min;
+ /* There is no sign bit. (negative current is mapped from 0)
+ * (sourced/sinked) current = raw * scale + offset
+ * where offset in case of CH0 can be negative.
+ */
+ *val2 = 14;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ return ad5770r_get_filter_freq(indio_dev, chan, val);
+ case IIO_CHAN_INFO_OFFSET:
+ ret = ad5770r_get_range(st, chan->channel, &min, &max);
+ if (ret < 0)
+ return ret;
+ *val = min;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad5770r_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long info)
+{
+ struct ad5770r_state *st = iio_priv(indio_dev);
+ u8 buf[2];
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ buf[0] = ((u16)val >> 6);
+ buf[1] = (val & 0x3F) << 2;
+ return regmap_bulk_write(st->regmap, chan->address,
+ buf, ARRAY_SIZE(buf));
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ return ad5770r_set_filter_freq(indio_dev, chan, val);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad5770r_read_freq_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ *type = IIO_VAL_INT;
+ *vals = ad5770r_filter_freqs;
+ *length = ARRAY_SIZE(ad5770r_filter_freqs);
+ return IIO_AVAIL_LIST;
+ }
+
+ return -EINVAL;
+}
+
+static int ad5770r_reg_access(struct iio_dev *indio_dev,
+ unsigned int reg,
+ unsigned int writeval,
+ unsigned int *readval)
+{
+ struct ad5770r_state *st = iio_priv(indio_dev);
+
+ if (readval)
+ return regmap_read(st->regmap, reg, readval);
+ else
+ return regmap_write(st->regmap, reg, writeval);
+}
+
+static const struct iio_info ad5770r_info = {
+ .read_raw = ad5770r_read_raw,
+ .write_raw = ad5770r_write_raw,
+ .read_avail = ad5770r_read_freq_avail,
+ .debugfs_reg_access = &ad5770r_reg_access,
+};
+
+static int ad5770r_store_output_range(struct ad5770r_state *st,
+ int min, int max, int index)
+{
+ int i;
+
+ for (i = 0; i < AD5770R_MAX_CH_MODES; i++) {
+ if (ad5770r_rng_tbl[i].ch != index)
+ continue;
+ if (ad5770r_rng_tbl[i].min != min ||
+ ad5770r_rng_tbl[i].max != max)
+ continue;
+ st->output_mode[index].out_range_mode = ad5770r_rng_tbl[i].mode;
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static ssize_t ad5770r_read_dac_powerdown(struct iio_dev *indio_dev,
+ uintptr_t private,
+ const struct iio_chan_spec *chan,
+ char *buf)
+{
+ struct ad5770r_state *st = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n", st->ch_pwr_down[chan->channel]);
+}
+
+static ssize_t ad5770r_write_dac_powerdown(struct iio_dev *indio_dev,
+ uintptr_t private,
+ const struct iio_chan_spec *chan,
+ const char *buf, size_t len)
+{
+ struct ad5770r_state *st = iio_priv(indio_dev);
+ unsigned int regval;
+ unsigned int mask;
+ bool readin;
+ int ret;
+
+ ret = kstrtobool(buf, &readin);
+ if (ret)
+ return ret;
+
+ readin = !readin;
+
+ regval = AD5770R_CFG_SHUTDOWN_B(readin, chan->channel);
+ if (chan->channel == 0 &&
+ st->output_mode[0].out_range_mode > AD5770R_CH0_0_300) {
+ regval |= AD5770R_CFG_CH0_SINK_EN(readin);
+ mask = BIT(chan->channel) + BIT(7);
+ } else {
+ mask = BIT(chan->channel);
+ }
+ ret = regmap_update_bits(st->regmap, AD5770R_CHANNEL_CONFIG, mask,
+ regval);
+ if (ret)
+ return ret;
+
+ regval = AD5770R_CH_SET(readin, chan->channel);
+ ret = regmap_update_bits(st->regmap, AD5770R_CH_ENABLE,
+ BIT(chan->channel), regval);
+ if (ret)
+ return ret;
+
+ st->ch_pwr_down[chan->channel] = !readin;
+
+ return len;
+}
+
+static const struct iio_chan_spec_ext_info ad5770r_ext_info[] = {
+ {
+ .name = "powerdown",
+ .read = ad5770r_read_dac_powerdown,
+ .write = ad5770r_write_dac_powerdown,
+ .shared = IIO_SEPARATE,
+ },
+ { }
+};
+
+#define AD5770R_IDAC_CHANNEL(index, reg) { \
+ .type = IIO_CURRENT, \
+ .address = reg, \
+ .indexed = 1, \
+ .channel = index, \
+ .output = 1, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_OFFSET) | \
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
+ .info_mask_shared_by_type_available = \
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
+ .ext_info = ad5770r_ext_info, \
+}
+
+static const struct iio_chan_spec ad5770r_channels[] = {
+ AD5770R_IDAC_CHANNEL(0, AD5770R_DAC_MSB(0)),
+ AD5770R_IDAC_CHANNEL(1, AD5770R_DAC_MSB(1)),
+ AD5770R_IDAC_CHANNEL(2, AD5770R_DAC_MSB(2)),
+ AD5770R_IDAC_CHANNEL(3, AD5770R_DAC_MSB(3)),
+ AD5770R_IDAC_CHANNEL(4, AD5770R_DAC_MSB(4)),
+ AD5770R_IDAC_CHANNEL(5, AD5770R_DAC_MSB(5)),
+};
+
+static int ad5770r_channel_config(struct ad5770r_state *st)
+{
+ int ret, tmp[2], min, max;
+ unsigned int num;
+ struct fwnode_handle *child;
+
+ num = device_get_child_node_count(&st->spi->dev);
+ if (num != AD5770R_MAX_CHANNELS)
+ return -EINVAL;
+
+ device_for_each_child_node(&st->spi->dev, child) {
+ ret = fwnode_property_read_u32(child, "num", &num);
+ if (ret)
+ return ret;
+ if (num > AD5770R_MAX_CHANNELS)
+ return -EINVAL;
+
+ ret = fwnode_property_read_u32_array(child,
+ "adi,range-microamp",
+ tmp, 2);
+ if (ret)
+ return ret;
+
+ min = tmp[0] / 1000;
+ max = tmp[1] / 1000;
+ ret = ad5770r_store_output_range(st, min, max, num);
+ if (ret)
+ return ret;
+ }
+
+ return ret;
+}
+
+static int ad5770r_init(struct ad5770r_state *st)
+{
+ int ret, i;
+
+ st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(st->gpio_reset))
+ return PTR_ERR(st->gpio_reset);
+
+ /* Perform a reset */
+ ret = ad5770r_reset(st);
+ if (ret)
+ return ret;
+
+ /* Set output range */
+ ret = ad5770r_channel_config(st);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < AD5770R_MAX_CHANNELS; i++) {
+ ret = ad5770r_set_output_mode(st, &st->output_mode[i], i);
+ if (ret)
+ return ret;
+ }
+
+ st->external_res = fwnode_property_read_bool(st->spi->dev.fwnode,
+ "adi,external-resistor");
+
+ ret = ad5770r_set_reference(st);
+ if (ret)
+ return ret;
+
+ /* Set outputs off */
+ ret = regmap_write(st->regmap, AD5770R_CHANNEL_CONFIG, 0x00);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(st->regmap, AD5770R_CH_ENABLE, 0x00);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < AD5770R_MAX_CHANNELS; i++)
+ st->ch_pwr_down[i] = true;
+
+ return ret;
+}
+
+static void ad5770r_disable_regulator(void *data)
+{
+ struct spi_device *spi = (struct spi_device *)data;
+ struct iio_dev *indio_dev = spi_get_drvdata(spi);
+ struct ad5770r_state *st = iio_priv(indio_dev);
+
+ if (st->vref_reg)
+ regulator_disable(st->vref_reg);
+}
+
+static int ad5770r_probe(struct spi_device *spi)
+{
+ struct ad5770r_state *st;
+ struct iio_dev *indio_dev;
+ struct regmap *regmap;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ spi_set_drvdata(spi, indio_dev);
+
+ st->spi = spi;
+
+ regmap = devm_regmap_init_spi(spi, &ad5770r_spi_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
+ PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+ st->regmap = regmap;
+
+ ret = devm_add_action_or_reset(&spi->dev, ad5770r_disable_regulator,
+ st);
+ if (ret < 0)
+ return ret;
+
+ st->vref_reg = devm_regulator_get_optional(&spi->dev, "vref");
+ if (!IS_ERR(st->vref_reg)) {
+ ret = regulator_enable(st->vref_reg);
+ if (ret) {
+ dev_err(&spi->dev,
+ "Failed to enable vref regulators: %d\n", ret);
+ return ret;
+ }
+
+ ret = regulator_get_voltage(st->vref_reg);
+ if (ret < 0)
+ return ret;
+
+ st->vref = ret / 1000;
+ } else {
+ if (PTR_ERR(st->vref_reg) == -ENODEV) {
+ st->vref = AD5770R_LOW_VREF_mV;
+ st->internal_ref = true;
+ } else {
+ return PTR_ERR(st->vref_reg);
+ }
+ }
+
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->name = spi_get_device_id(spi)->name;
+ indio_dev->info = &ad5770r_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = ad5770r_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ad5770r_channels);
+
+ ret = ad5770r_init(st);
+ if (ret < 0) {
+ dev_err(&spi->dev, "AD5770R init failed\n");
+ return ret;
+ }
+
+ return devm_iio_device_register(&st->spi->dev, indio_dev);
+}
+
+static const struct of_device_id ad5770r_of_id[] = {
+ { .compatible = "adi,ad5770r", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ad5770r_of_id);
+
+static const struct spi_device_id ad5770r_id[] = {
+ { "ad5770r", 0 },
+ {},
+};
+MODULE_DEVICE_TABLE(spi, ad5770r_id);
+
+static struct spi_driver ad5770r_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = of_match_ptr(ad5770r_of_id),
+ },
+ .probe = ad5770r_probe,
+ .id_table = ad5770r_id,
+};
+
+module_spi_driver(ad5770r_driver);
+
+MODULE_AUTHOR("Mircea Caprioru <mircea.caprioru@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Analog Devices AD5770R IDAC");
+MODULE_LICENSE("GPL v2");
--
2.20.1