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Message-Id: <20211125131422.50657-4-demonsingur@gmail.com>
Date: Thu, 25 Nov 2021 15:14:22 +0200
From: Cosmin Tanislav <demonsingur@...il.com>
To: unlisted-recipients:; (no To-header on input)
Cc: demonsingur@...il.com, cosmin.tanislav@...log.com,
Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Rob Herring <robh+dt@...nel.org>, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>, linux-gpio@...r.kernel.org
Subject: [PATCH v4 3/3] iio: addac: add AD74413R driver
The AD74412R and AD74413R are quad-channel software configurable input/output
solutions for building and process control applications. They contain
functionality for analog output, analog input, digital input, resistance
temperature detector, and thermocouple measurements integrated
into a single chip solution with an SPI interface.
The devices feature a 16-bit ADC and four configurable 13-bit DACs to provide
four configurable input/output channels and a suite of diagnostic functions.
The AD74413R differentiates itself from the AD74412R by being HART-compatible.
When configured with channel 0 as voltage output, channel 1 as current
output, channel 2 as voltage input and channel 3 as current input, the
following structure is created under the corresponding IIO device.
.
├── in_current0_offset
├── in_current0_raw
├── in_current0_sampling_frequency
├── in_current0_sampling_frequency_available
├── in_current0_scale
├── in_voltage1_offset
├── in_voltage1_raw
├── in_voltage1_sampling_frequency
├── in_voltage1_sampling_frequency_available
├── in_voltage1_scale
├── in_voltage2_offset
├── in_voltage2_raw
├── in_voltage2_sampling_frequency
├── in_voltage2_sampling_frequency_available
├── in_voltage2_scale
├── in_current3_offset
├── in_current3_raw
├── in_current3_sampling_frequency
├── in_current3_sampling_frequency_available
├── in_current3_scale
├── out_voltage0_raw
├── out_voltage0_scale
├── out_current1_raw
├── out_current1_scale
├── name
├── buffer
│ ├── data_available
│ ├── enable
│ ├── length
│ └── watermark
└── scan_elements
├── in_current0_en
├── in_current0_index
├── in_current0_type
├── in_voltage1_en
├── in_voltage1_index
├── in_voltage1_type
├── in_voltage2_en
├── in_voltage2_index
├── in_voltage2_type
├── in_current3_en
├── in_current3_index
└── in_current3_type
Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>
---
MAINTAINERS | 9 +
drivers/iio/addac/Kconfig | 12 +
drivers/iio/addac/Makefile | 1 +
drivers/iio/addac/ad74413r.c | 1473 ++++++++++++++++++++++++++++++++++
4 files changed, 1495 insertions(+)
create mode 100644 drivers/iio/addac/ad74413r.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 7a2345ce8521..ed13c5efeb4f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1069,6 +1069,15 @@ W: http://ez.analog.com/community/linux-device-drivers
F: Documentation/devicetree/bindings/iio/adc/adi,ad7780.yaml
F: drivers/iio/adc/ad7780.c
+ANALOG DEVICES INC AD74413R DRIVER
+M: Cosmin Tanislav <cosmin.tanislav@...log.com>
+L: linux-iio@...r.kernel.org
+S: Supported
+W: http://ez.analog.com/community/linux-device-drivers
+F: Documentation/devicetree/bindings/iio/addac/adi,ad74413r.yaml
+F: drivers/iio/addac/ad74413r.c
+F: include/dt-bindings/iio/addac/adi,ad74413r.h
+
ANALOG DEVICES INC AD9389B DRIVER
M: Hans Verkuil <hverkuil-cisco@...all.nl>
L: linux-media@...r.kernel.org
diff --git a/drivers/iio/addac/Kconfig b/drivers/iio/addac/Kconfig
index 2e64d7755d5e..138492362f20 100644
--- a/drivers/iio/addac/Kconfig
+++ b/drivers/iio/addac/Kconfig
@@ -5,4 +5,16 @@
menu "Analog to digital and digital to analog converters"
+config AD74413R
+ tristate "Analog Devices AD74412R/AD74413R driver"
+ depends on GPIOLIB && SPI
+ select REGMAP_SPI
+ select CRC8
+ help
+ Say yes here to build support for Analog Devices AD74412R/AD74413R
+ quad-channel software configurable input/output solution.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad74413r.
+
endmenu
diff --git a/drivers/iio/addac/Makefile b/drivers/iio/addac/Makefile
index b888b9ee12da..cfd4bbe64ad3 100644
--- a/drivers/iio/addac/Makefile
+++ b/drivers/iio/addac/Makefile
@@ -4,3 +4,4 @@
#
# When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_AD74413R) += ad74413r.o
diff --git a/drivers/iio/addac/ad74413r.c b/drivers/iio/addac/ad74413r.c
new file mode 100644
index 000000000000..7fd2c34d2cf0
--- /dev/null
+++ b/drivers/iio/addac/ad74413r.c
@@ -0,0 +1,1473 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Analog Devices, Inc.
+ * Author: Cosmin Tanislav <cosmin.tanislav@...log.com>
+ */
+
+#include <asm/unaligned.h>
+#include <linux/bitfield.h>
+#include <linux/crc8.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/interrupt.h>
+#include <linux/mod_devicetable.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <dt-bindings/iio/addac/adi,ad74413r.h>
+
+#define AD74413R_CRC_POLYNOMIAL 0x7
+DECLARE_CRC8_TABLE(ad74413r_crc8_table);
+
+#define AD74413R_CHANNEL_MAX 4
+
+#define AD74413R_FRAME_SIZE 4
+
+struct ad74413r_chip_info {
+ const char *name;
+ bool hart_support;
+};
+
+struct ad74413r_channel_config {
+ u32 func;
+ bool gpo_comparator;
+ bool initialized;
+};
+
+struct ad74413r_channels {
+ struct iio_chan_spec *channels;
+ unsigned int num_channels;
+};
+
+struct ad74413r_state {
+ struct ad74413r_channel_config channel_configs[AD74413R_CHANNEL_MAX];
+ unsigned int gpo_gpio_offsets[AD74413R_CHANNEL_MAX];
+ unsigned int comp_gpio_offsets[AD74413R_CHANNEL_MAX];
+ struct gpio_chip gpo_gpiochip;
+ struct gpio_chip comp_gpiochip;
+ struct mutex lock;
+ struct completion adc_data_completion;
+ unsigned int num_gpo_gpios;
+ unsigned int num_comparator_gpios;
+ u32 rsense_resistance_ohms;
+
+ const struct ad74413r_chip_info *chip_info;
+ struct spi_device *spi;
+ struct regulator *refin_reg;
+ struct regmap *regmap;
+ struct device *dev;
+ struct iio_trigger *trig;
+
+ size_t adc_active_channels;
+ struct spi_message adc_samples_msg;
+ struct spi_transfer adc_samples_xfer[AD74413R_CHANNEL_MAX + 1];
+
+ /*
+ * DMA (thus cache coherency maintenance) requires the
+ * transfer buffers to live in their own cache lines.
+ */
+ struct {
+ u8 rx_buf[AD74413R_FRAME_SIZE * AD74413R_CHANNEL_MAX];
+ s64 timestamp;
+ } adc_samples_buf ____cacheline_aligned;
+
+ u8 adc_samples_tx_buf[AD74413R_FRAME_SIZE * AD74413R_CHANNEL_MAX]
+ ____cacheline_aligned;
+ u8 reg_tx_buf[AD74413R_FRAME_SIZE] ____cacheline_aligned;
+ u8 reg_rx_buf[AD74413R_FRAME_SIZE] ____cacheline_aligned;
+};
+
+#define AD74413R_REG_NOP 0x00
+
+#define AD74413R_REG_CH_FUNC_SETUP_X(x) (0x01 + (x))
+#define AD74413R_CH_FUNC_SETUP_MASK GENMASK(3, 0)
+
+#define AD74413R_REG_ADC_CONFIG_X(x) (0x05 + (x))
+#define AD74413R_ADC_CONFIG_RANGE_MASK GENMASK(7, 5)
+#define AD74413R_ADC_CONFIG_REJECTION_MASK GENMASK(4, 3)
+#define AD74413R_ADC_RANGE_10V 0b000
+#define AD74413R_ADC_RANGE_2P5V_EXT_POW 0b001
+#define AD74413R_ADC_RANGE_2P5V_INT_POW 0b010
+#define AD74413R_ADC_RANGE_5V_BI_DIR 0b011
+#define AD74413R_ADC_REJECTION_50_60 0b00
+#define AD74413R_ADC_REJECTION_NONE 0b01
+#define AD74413R_ADC_REJECTION_50_60_HART 0b10
+#define AD74413R_ADC_REJECTION_HART 0b11
+
+#define AD74413R_REG_DIN_CONFIG_X(x) (0x09 + (x))
+#define AD74413R_DIN_DEBOUNCE_MASK GENMASK(4, 0)
+#define AD74413R_DIN_DEBOUNCE_LEN (1 << 5)
+
+#define AD74413R_REG_DAC_CODE_X(x) (0x16 + (x))
+#define AD74413R_DAC_CODE_MAX ((1 << 13) - 1)
+#define AD74413R_DAC_VOLTAGE_MAX 11000
+
+#define AD74413R_REG_GPO_PAR_DATA 0x0d
+#define AD74413R_REG_GPO_CONFIG_X(x) (0x0e + (x))
+#define AD74413R_GPO_CONFIG_DATA_MASK BIT(3)
+#define AD74413R_GPO_CONFIG_SELECT_MASK GENMASK(2, 0)
+#define AD74413R_GPO_CONFIG_100K_PULL_DOWN 0b000
+#define AD74413R_GPO_CONFIG_LOGIC 0b001
+#define AD74413R_GPO_CONFIG_LOGIC_PARALLEL 0b010
+#define AD74413R_GPO_CONFIG_COMPARATOR 0b011
+#define AD74413R_GPO_CONFIG_HIGH_IMPEDANCE 0b100
+
+#define AD74413R_REG_ADC_CONV_CTRL 0x23
+#define AD74413R_CONV_SEQ_MASK GENMASK(9, 8)
+#define AD74413R_CONV_SEQ_ON 0b00
+#define AD74413R_CONV_SEQ_SINGLE 0b01
+#define AD74413R_CONV_SEQ_CONTINUOUS 0b10
+#define AD74413R_CONV_SEQ_OFF 0b11
+#define AD74413R_CH_EN_MASK(x) BIT(x)
+
+#define AD74413R_REG_DIN_COMP_OUT 0x25
+#define AD74413R_DIN_COMP_OUT_SHIFT_X(x) x
+
+#define AD74413R_REG_ADC_RESULT_X(x) (0x26 + (x))
+#define AD74413R_ADC_RESULT_MAX GENMASK(15, 0)
+
+#define AD74413R_REG_READ_SELECT 0x41
+
+#define AD74413R_REG_CMD_KEY 0x44
+#define AD74413R_CMD_KEY_LDAC 0x953a
+#define AD74413R_CMD_KEY_RESET1 0x15fa
+#define AD74413R_CMD_KEY_RESET2 0xaf51
+
+static const int ad74413r_adc_sampling_rates[] = {
+ 20, 4800,
+};
+
+static const int ad74413r_adc_sampling_rates_hart[] = {
+ 10, 20, 1200, 4800,
+};
+
+static int ad74413r_crc(u8 *buf)
+{
+ return crc8(ad74413r_crc8_table, buf, 3, 0);
+}
+
+static void ad74413r_format_reg_write(u8 reg, u16 val, u8 *buf)
+{
+ buf[0] = reg;
+ put_unaligned_be16(val, &buf[1]);
+ buf[3] = ad74413r_crc(buf);
+}
+
+static int ad74413r_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct ad74413r_state *st = context;
+
+ ad74413r_format_reg_write(reg, val, st->reg_tx_buf);
+
+ return spi_write(st->spi, st->reg_tx_buf, AD74413R_FRAME_SIZE);
+}
+
+static int ad74413r_crc_check(struct ad74413r_state *st, u8 *buf)
+{
+ u8 expected_crc = ad74413r_crc(buf);
+
+ if (buf[3] != expected_crc) {
+ dev_err(st->dev, "Bad CRC %02x for %02x%02x%02x\n",
+ buf[3], buf[0], buf[1], buf[2]);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ad74413r_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct ad74413r_state *st = context;
+ struct spi_transfer reg_read_xfer[] = {
+ {
+ .tx_buf = st->reg_tx_buf,
+ .len = AD74413R_FRAME_SIZE,
+ .cs_change = 1,
+ },
+ {
+ .rx_buf = st->reg_rx_buf,
+ .len = AD74413R_FRAME_SIZE,
+ },
+ };
+ int ret;
+
+ ad74413r_format_reg_write(AD74413R_REG_READ_SELECT, reg,
+ st->reg_tx_buf);
+
+ ret = spi_sync_transfer(st->spi, reg_read_xfer,
+ ARRAY_SIZE(reg_read_xfer));
+ if (ret)
+ return ret;
+
+ ret = ad74413r_crc_check(st, st->reg_rx_buf);
+ if (ret)
+ return ret;
+
+ *val = get_unaligned_be16(&st->reg_rx_buf[1]);
+
+ return 0;
+}
+
+const struct regmap_config ad74413r_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+ .reg_read = ad74413r_reg_read,
+ .reg_write = ad74413r_reg_write,
+};
+
+static int ad74413r_set_gpo_config(struct ad74413r_state *st,
+ unsigned int offset, u8 mode)
+{
+ return regmap_update_bits(st->regmap, AD74413R_REG_GPO_CONFIG_X(offset),
+ AD74413R_GPO_CONFIG_SELECT_MASK, mode);
+}
+
+static const unsigned int ad74413r_debounce_map[AD74413R_DIN_DEBOUNCE_LEN] = {
+ 0, 13, 18, 24, 32, 42, 56, 75,
+ 100, 130, 180, 240, 320, 420, 560, 750,
+ 1000, 1300, 1800, 2400, 3200, 4200, 5600, 7500,
+ 10000, 13000, 18000, 24000, 32000, 42000, 56000, 75000,
+};
+
+static int ad74413r_set_comp_debounce(struct ad74413r_state *st,
+ unsigned int offset,
+ unsigned int debounce)
+{
+ unsigned int val = AD74413R_DIN_DEBOUNCE_LEN - 1;
+ unsigned int i;
+
+ for (i = 0; i < AD74413R_DIN_DEBOUNCE_LEN; i++)
+ if (debounce <= ad74413r_debounce_map[i]) {
+ val = i;
+ break;
+ }
+
+ return regmap_update_bits(st->regmap,
+ AD74413R_REG_DIN_CONFIG_X(offset),
+ AD74413R_DIN_DEBOUNCE_MASK,
+ val);
+}
+
+static void ad74413r_gpio_set(struct gpio_chip *chip,
+ unsigned int offset, int val)
+{
+ struct ad74413r_state *st = gpiochip_get_data(chip);
+ unsigned int real_offset = st->gpo_gpio_offsets[offset];
+ int ret;
+
+ ret = ad74413r_set_gpo_config(st, real_offset,
+ AD74413R_GPO_CONFIG_LOGIC);
+ if (ret)
+ return;
+
+ regmap_update_bits(st->regmap, AD74413R_REG_GPO_CONFIG_X(real_offset),
+ AD74413R_GPO_CONFIG_DATA_MASK,
+ val ? AD74413R_GPO_CONFIG_DATA_MASK : 0);
+}
+
+static void ad74413r_gpio_set_multiple(struct gpio_chip *chip,
+ unsigned long *mask,
+ unsigned long *bits)
+{
+ struct ad74413r_state *st = gpiochip_get_data(chip);
+ unsigned long real_mask = 0;
+ unsigned long real_bits = 0;
+ unsigned int offset = 0;
+ int ret;
+
+ for_each_set_bit_from(offset, mask, AD74413R_CHANNEL_MAX) {
+ unsigned int real_offset = st->gpo_gpio_offsets[offset];
+
+ ret = ad74413r_set_gpo_config(st, real_offset,
+ AD74413R_GPO_CONFIG_LOGIC_PARALLEL);
+ if (ret)
+ return;
+
+ real_mask |= BIT(real_offset);
+ if (*bits & offset)
+ real_bits |= BIT(real_offset);
+ }
+
+ regmap_update_bits(st->regmap, AD74413R_REG_GPO_PAR_DATA,
+ real_mask, real_bits);
+}
+
+static int ad74413r_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct ad74413r_state *st = gpiochip_get_data(chip);
+ unsigned int real_offset = st->comp_gpio_offsets[offset];
+ unsigned int status;
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74413R_REG_DIN_COMP_OUT, &status);
+ if (ret)
+ return ret;
+
+ status &= AD74413R_DIN_COMP_OUT_SHIFT_X(real_offset);
+
+ return status ? 1 : 0;
+}
+
+static int ad74413r_gpio_get_multiple(struct gpio_chip *chip,
+ unsigned long *mask,
+ unsigned long *bits)
+{
+ struct ad74413r_state *st = gpiochip_get_data(chip);
+ unsigned int offset = 0;
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74413R_REG_DIN_COMP_OUT, &val);
+ if (ret)
+ return ret;
+
+ for_each_set_bit_from(offset, mask, AD74413R_CHANNEL_MAX) {
+ unsigned int real_offset = st->comp_gpio_offsets[offset];
+
+ if (val & BIT(real_offset))
+ *bits |= offset;
+ }
+
+ return ret;
+}
+
+static int ad74413r_gpio_get_gpo_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ return GPIO_LINE_DIRECTION_OUT;
+}
+
+static int ad74413r_gpio_get_comp_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ return GPIO_LINE_DIRECTION_IN;
+}
+
+static int ad74413r_gpio_set_gpo_config(struct gpio_chip *chip,
+ unsigned int offset,
+ unsigned long config)
+{
+ struct ad74413r_state *st = gpiochip_get_data(chip);
+ unsigned int real_offset = st->gpo_gpio_offsets[offset];
+
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ return ad74413r_set_gpo_config(st, real_offset,
+ AD74413R_GPO_CONFIG_100K_PULL_DOWN);
+ case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+ return ad74413r_set_gpo_config(st, real_offset,
+ AD74413R_GPO_CONFIG_HIGH_IMPEDANCE);
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ad74413r_gpio_set_comp_config(struct gpio_chip *chip,
+ unsigned int offset,
+ unsigned long config)
+{
+ struct ad74413r_state *st = gpiochip_get_data(chip);
+ unsigned int real_offset = st->comp_gpio_offsets[offset];
+
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_INPUT_DEBOUNCE:
+ return ad74413r_set_comp_debounce(st, real_offset,
+ pinconf_to_config_argument(config));
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static int ad74413r_reset(struct ad74413r_state *st)
+{
+ int ret;
+
+ ret = regmap_write(st->regmap, AD74413R_REG_CMD_KEY,
+ AD74413R_CMD_KEY_RESET1);
+ if (ret)
+ return ret;
+
+ return regmap_write(st->regmap, AD74413R_REG_CMD_KEY,
+ AD74413R_CMD_KEY_RESET2);
+}
+
+static int ad74413r_set_channel_dac_code(struct ad74413r_state *st,
+ unsigned int channel, int dac_code)
+{
+ struct reg_sequence reg_seq[2] = {
+ { AD74413R_REG_DAC_CODE_X(channel), dac_code },
+ { AD74413R_REG_CMD_KEY, AD74413R_CMD_KEY_LDAC },
+ };
+
+ return regmap_multi_reg_write(st->regmap, reg_seq, 2);
+}
+
+static int ad74413r_set_channel_function(struct ad74413r_state *st,
+ unsigned int channel, u8 func)
+{
+ return regmap_update_bits(st->regmap,
+ AD74413R_REG_CH_FUNC_SETUP_X(channel),
+ AD74413R_CH_FUNC_SETUP_MASK, func);
+}
+
+static int ad74413r_set_adc_conv_seq(struct ad74413r_state *st,
+ unsigned int status)
+{
+ int ret;
+
+ /*
+ * These bits do not clear when a conversion completes.
+ * To enable a subsequent conversion, repeat the write.
+ */
+ ret = regmap_write_bits(st->regmap, AD74413R_REG_ADC_CONV_CTRL,
+ AD74413R_CONV_SEQ_MASK,
+ FIELD_PREP(AD74413R_CONV_SEQ_MASK, status));
+ if (ret)
+ return ret;
+
+ /*
+ * Wait 100us before starting conversions.
+ */
+ usleep_range(100, 120);
+
+ return 0;
+}
+
+static int ad74413r_set_adc_channel_enable(struct ad74413r_state *st,
+ unsigned int channel,
+ bool status)
+{
+ return regmap_update_bits(st->regmap, AD74413R_REG_ADC_CONV_CTRL,
+ AD74413R_CH_EN_MASK(channel),
+ status ? AD74413R_CH_EN_MASK(channel) : 0);
+}
+
+static int ad74413r_get_adc_range(struct ad74413r_state *st,
+ unsigned int channel,
+ unsigned int *val)
+{
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74413R_REG_ADC_CONFIG_X(channel), val);
+ if (ret)
+ return ret;
+
+ *val = FIELD_GET(AD74413R_ADC_CONFIG_RANGE_MASK, *val);
+
+ return 0;
+}
+
+static int ad74413r_get_adc_rejection(struct ad74413r_state *st,
+ unsigned int channel,
+ unsigned int *val)
+{
+ int ret;
+
+ ret = regmap_read(st->regmap, AD74413R_REG_ADC_CONFIG_X(channel), val);
+ if (ret)
+ return ret;
+
+ *val = FIELD_GET(AD74413R_ADC_CONFIG_REJECTION_MASK, *val);
+
+ return 0;
+}
+
+static int ad74413r_set_adc_rejection(struct ad74413r_state *st,
+ unsigned int channel,
+ unsigned int val)
+{
+ return regmap_update_bits(st->regmap,
+ AD74413R_REG_ADC_CONFIG_X(channel),
+ AD74413R_ADC_CONFIG_REJECTION_MASK,
+ FIELD_PREP(AD74413R_ADC_CONFIG_REJECTION_MASK,
+ val));
+}
+
+static int ad74413r_rejection_to_rate(struct ad74413r_state *st,
+ unsigned int rej, int *val)
+{
+ switch (rej) {
+ case AD74413R_ADC_REJECTION_50_60:
+ *val = 20;
+ return 0;
+ case AD74413R_ADC_REJECTION_NONE:
+ *val = 4800;
+ return 0;
+ case AD74413R_ADC_REJECTION_50_60_HART:
+ *val = 10;
+ return 0;
+ case AD74413R_ADC_REJECTION_HART:
+ *val = 1200;
+ return 0;
+ default:
+ dev_err(st->dev, "ADC rejection invalid\n");
+ return -EINVAL;
+ }
+}
+
+static int ad74413r_rate_to_rejection(struct ad74413r_state *st,
+ int rate, unsigned int *val)
+{
+ switch (rate) {
+ case 20:
+ *val = AD74413R_ADC_REJECTION_50_60;
+ return 0;
+ case 4800:
+ *val = AD74413R_ADC_REJECTION_NONE;
+ return 0;
+ case 10:
+ *val = AD74413R_ADC_REJECTION_50_60_HART;
+ return 0;
+ case 1200:
+ *val = AD74413R_ADC_REJECTION_HART;
+ return 0;
+ default:
+ dev_err(st->dev, "ADC rate invalid\n");
+ return -EINVAL;
+ }
+}
+
+static int ad74413r_range_to_voltage_range(struct ad74413r_state *st,
+ unsigned int range, int *val)
+{
+ switch (range) {
+ case AD74413R_ADC_RANGE_10V:
+ *val = 10000;
+ return 0;
+ case AD74413R_ADC_RANGE_2P5V_EXT_POW:
+ case AD74413R_ADC_RANGE_2P5V_INT_POW:
+ *val = 2500;
+ return 0;
+ case AD74413R_ADC_RANGE_5V_BI_DIR:
+ *val = 5000;
+ return 0;
+ default:
+ dev_err(st->dev, "ADC range invalid\n");
+ return -EINVAL;
+ }
+}
+
+static int ad74413r_range_to_voltage_offset(struct ad74413r_state *st,
+ unsigned int range, int *val)
+{
+ switch (range) {
+ case AD74413R_ADC_RANGE_10V:
+ case AD74413R_ADC_RANGE_2P5V_EXT_POW:
+ *val = 0;
+ return 0;
+ case AD74413R_ADC_RANGE_2P5V_INT_POW:
+ case AD74413R_ADC_RANGE_5V_BI_DIR:
+ *val = -2500;
+ return 0;
+ default:
+ dev_err(st->dev, "ADC range invalid\n");
+ return -EINVAL;
+ }
+}
+
+static int ad74413r_range_to_voltage_offset_raw(struct ad74413r_state *st,
+ unsigned int range, int *val)
+{
+ switch (range) {
+ case AD74413R_ADC_RANGE_10V:
+ case AD74413R_ADC_RANGE_2P5V_EXT_POW:
+ *val = 0;
+ return 0;
+ case AD74413R_ADC_RANGE_2P5V_INT_POW:
+ *val = -AD74413R_ADC_RESULT_MAX;
+ return 0;
+ case AD74413R_ADC_RANGE_5V_BI_DIR:
+ *val = -AD74413R_ADC_RESULT_MAX / 2;
+ return 0;
+ default:
+ dev_err(st->dev, "ADC range invalid\n");
+ return -EINVAL;
+ }
+}
+
+static int ad74413r_get_output_voltage_scale(struct ad74413r_state *st,
+ int *val, int *val2)
+{
+ *val = AD74413R_DAC_VOLTAGE_MAX;
+ *val2 = AD74413R_DAC_CODE_MAX;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int ad74413r_get_output_current_scale(struct ad74413r_state *st,
+ int *val, int *val2)
+{
+ *val = regulator_get_voltage(st->refin_reg);
+ *val2 = st->rsense_resistance_ohms * AD74413R_DAC_CODE_MAX * 1000;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int ad74413r_get_input_voltage_scale(struct ad74413r_state *st,
+ unsigned int channel,
+ int *val, int *val2)
+{
+ unsigned int range;
+ int ret;
+
+ ret = ad74413r_get_adc_range(st, channel, &range);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_range_to_voltage_range(st, range, val);
+ if (ret)
+ return ret;
+
+ *val2 = AD74413R_ADC_RESULT_MAX;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+
+static int ad74413r_get_input_voltage_offset(struct ad74413r_state *st,
+ unsigned int channel, int *val)
+{
+ unsigned int range;
+ int ret;
+
+ ret = ad74413r_get_adc_range(st, channel, &range);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_range_to_voltage_offset_raw(st, range, val);
+ if (ret)
+ return ret;
+
+ return IIO_VAL_INT;
+}
+
+static int ad74413r_get_input_current_scale(struct ad74413r_state *st,
+ unsigned int channel, int *val,
+ int *val2)
+{
+ unsigned int range;
+ int ret;
+
+ ret = ad74413r_get_adc_range(st, channel, &range);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_range_to_voltage_range(st, range, val);
+ if (ret)
+ return ret;
+
+ *val2 = AD74413R_ADC_RESULT_MAX * st->rsense_resistance_ohms;
+
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int ad74413_get_input_current_offset(struct ad74413r_state *st,
+ unsigned int channel, int *val)
+{
+ unsigned int range;
+ int voltage_range;
+ int voltage_offset;
+ int ret;
+
+ ret = ad74413r_get_adc_range(st, channel, &range);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_range_to_voltage_range(st, range, &voltage_range);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_range_to_voltage_offset(st, range, &voltage_offset);
+ if (ret)
+ return ret;
+
+ *val = voltage_offset * AD74413R_ADC_RESULT_MAX / voltage_range;
+
+ return IIO_VAL_INT;
+}
+
+static int ad74413r_get_adc_rate(struct ad74413r_state *st,
+ unsigned int channel, int *val)
+{
+ unsigned int rejection;
+ int ret;
+
+ ret = ad74413r_get_adc_rejection(st, channel, &rejection);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_rejection_to_rate(st, rejection, val);
+ if (ret)
+ return ret;
+
+ return IIO_VAL_INT;
+}
+
+static int ad74413r_set_adc_rate(struct ad74413r_state *st,
+ unsigned int channel, int val)
+{
+ unsigned int rejection;
+ int ret;
+
+ ret = ad74413r_rate_to_rejection(st, val, &rejection);
+ if (ret)
+ return ret;
+
+ return ad74413r_set_adc_rejection(st, channel, rejection);
+}
+
+static irqreturn_t ad74413r_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct ad74413r_state *st = iio_priv(indio_dev);
+ u8 *rx_buf = st->adc_samples_buf.rx_buf;
+ unsigned int i;
+ int ret;
+
+ ret = spi_sync(st->spi, &st->adc_samples_msg);
+ if (ret)
+ goto out;
+
+ for (i = 0; i < st->adc_active_channels; i++)
+ ad74413r_crc_check(st, &rx_buf[i * AD74413R_FRAME_SIZE]);
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &st->adc_samples_buf,
+ iio_get_time_ns(indio_dev));
+
+out:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ad74413r_adc_data_interrupt(int irq, void *data)
+{
+ struct iio_dev *indio_dev = data;
+ struct ad74413r_state *st = iio_priv(indio_dev);
+
+ if (iio_buffer_enabled(indio_dev))
+ iio_trigger_poll(st->trig);
+ else
+ complete(&st->adc_data_completion);
+
+ return IRQ_HANDLED;
+}
+
+static int _ad74413r_get_single_adc_result(struct ad74413r_state *st,
+ unsigned int channel, int *val)
+{
+ unsigned int uval;
+ int ret;
+
+ reinit_completion(&st->adc_data_completion);
+
+ ret = ad74413r_set_adc_channel_enable(st, channel, true);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_set_adc_conv_seq(st, AD74413R_CONV_SEQ_SINGLE);
+ if (ret)
+ return ret;
+
+ ret = wait_for_completion_timeout(&st->adc_data_completion,
+ msecs_to_jiffies(1000));
+ if (!ret) {
+ ret = -ETIMEDOUT;
+ return ret;
+ }
+
+ ret = regmap_read(st->regmap, AD74413R_REG_ADC_RESULT_X(channel),
+ &uval);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_set_adc_conv_seq(st, AD74413R_CONV_SEQ_OFF);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_set_adc_channel_enable(st, channel, false);
+ if (ret)
+ return ret;
+
+ *val = uval;
+
+ return IIO_VAL_INT;
+}
+
+static int ad74413r_get_single_adc_result(struct iio_dev *indio_dev,
+ unsigned int channel, int *val)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+ int ret;
+
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
+ mutex_lock(&st->lock);
+ ret = _ad74413r_get_single_adc_result(st, channel, val);
+ mutex_unlock(&st->lock);
+
+ iio_device_release_direct_mode(indio_dev);
+
+ return ret;
+}
+
+static int ad74413r_adc_to_resistance_result(int adc_result, int *val)
+{
+ if (adc_result == AD74413R_ADC_RESULT_MAX)
+ return -EINVAL;
+
+ *val = DIV_ROUND_CLOSEST(adc_result * 2100,
+ AD74413R_ADC_RESULT_MAX - adc_result);
+ return 0;
+}
+
+static int ad74413r_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *active_scan_mask)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+ struct spi_transfer *xfer = st->adc_samples_xfer;
+ u8 *rx_buf = &st->adc_samples_buf.rx_buf[-1 * AD74413R_FRAME_SIZE];
+ u8 *tx_buf = st->adc_samples_tx_buf;
+ unsigned int channel;
+ int ret;
+
+ mutex_lock(&st->lock);
+
+ spi_message_init(&st->adc_samples_msg);
+ st->adc_active_channels = 0;
+
+ for_each_clear_bit(channel, active_scan_mask, AD74413R_CHANNEL_MAX) {
+ ret = ad74413r_set_adc_channel_enable(st, channel, false);
+ if (ret)
+ goto out;
+ }
+
+ if (*active_scan_mask == 0)
+ goto out;
+
+ /*
+ * The read select register is used to select which register's value
+ * will be sent by the slave on the next SPI frame.
+ *
+ * Create an SPI message that, on each step, writes to the read select
+ * register to select the ADC result of the next enabled channel, and
+ * reads the ADC result of the previous enabled channel.
+ *
+ * Example:
+ * W: [WCH1] [WCH2] [WCH2] [WCH3] [ ]
+ * R: [ ] [RCH1] [RCH2] [RCH3] [RCH4]
+ */
+
+ for_each_set_bit(channel, active_scan_mask, AD74413R_CHANNEL_MAX) {
+ ret = ad74413r_set_adc_channel_enable(st, channel, true);
+ if (ret)
+ goto out;
+
+ st->adc_active_channels++;
+
+ if (xfer == st->adc_samples_xfer)
+ xfer->rx_buf = NULL;
+ else
+ xfer->rx_buf = rx_buf;
+
+ xfer->tx_buf = tx_buf;
+ xfer->len = AD74413R_FRAME_SIZE;
+ xfer->cs_change = 1;
+
+ ad74413r_format_reg_write(AD74413R_REG_READ_SELECT,
+ AD74413R_REG_ADC_RESULT_X(channel),
+ tx_buf);
+
+ spi_message_add_tail(xfer, &st->adc_samples_msg);
+
+ xfer++;
+ tx_buf += AD74413R_FRAME_SIZE;
+ rx_buf += AD74413R_FRAME_SIZE;
+ }
+
+ xfer->rx_buf = rx_buf;
+ xfer->tx_buf = NULL;
+ xfer->len = AD74413R_FRAME_SIZE;
+ xfer->cs_change = 0;
+
+ spi_message_add_tail(xfer, &st->adc_samples_msg);
+
+out:
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static int ad74413r_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+
+ return ad74413r_set_adc_conv_seq(st, AD74413R_CONV_SEQ_CONTINUOUS);
+}
+
+static int ad74413r_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+
+ return ad74413r_set_adc_conv_seq(st, AD74413R_CONV_SEQ_OFF);
+}
+
+static int ad74413r_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long info)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+
+ switch (info) {
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ if (chan->output)
+ return ad74413r_get_output_voltage_scale(st,
+ val, val2);
+ else
+ return ad74413r_get_input_voltage_scale(st,
+ chan->channel, val, val2);
+ case IIO_CURRENT:
+ if (chan->output)
+ return ad74413r_get_output_current_scale(st,
+ val, val2);
+ else
+ return ad74413r_get_input_current_scale(st,
+ chan->channel, val, val2);
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_OFFSET:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ return ad74413r_get_input_voltage_offset(st,
+ chan->channel, val);
+ case IIO_CURRENT:
+ return ad74413_get_input_current_offset(st,
+ chan->channel, val);
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_RAW:
+ if (chan->output)
+ return -EINVAL;
+
+ return ad74413r_get_single_adc_result(indio_dev, chan->channel,
+ val);
+ case IIO_CHAN_INFO_PROCESSED: {
+ int ret;
+
+ ret = ad74413r_get_single_adc_result(indio_dev, chan->channel,
+ val);
+ if (ret < 0)
+ return ret;
+
+ ad74413r_adc_to_resistance_result(*val, val);
+
+ return ret;
+ }
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return ad74413r_get_adc_rate(st, chan->channel, val);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad74413r_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long info)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ if (!chan->output)
+ return -EINVAL;
+
+ if (val > AD74413R_DAC_CODE_MAX) {
+ dev_err(st->dev, "Invalid DAC code\n");
+ return -EINVAL;
+ }
+
+ return ad74413r_set_channel_dac_code(st, chan->channel, val);
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return ad74413r_set_adc_rate(st, chan->channel, val);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad74413r_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long info)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+
+ switch (info) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ if (st->chip_info->hart_support) {
+ *vals = ad74413r_adc_sampling_rates_hart;
+ *length = ARRAY_SIZE(ad74413r_adc_sampling_rates_hart);
+ } else {
+ *vals = ad74413r_adc_sampling_rates;
+ *length = ARRAY_SIZE(ad74413r_adc_sampling_rates);
+ }
+ *type = IIO_VAL_INT;
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_buffer_setup_ops ad74413r_buffer_ops = {
+ .postenable = &ad74413r_buffer_postenable,
+ .predisable = &ad74413r_buffer_predisable,
+};
+
+static const struct iio_trigger_ops ad74413r_trigger_ops = {
+ .validate_device = iio_trigger_validate_own_device,
+};
+
+static const struct iio_info ad74413r_info = {
+ .read_raw = &ad74413r_read_raw,
+ .write_raw = &ad74413r_write_raw,
+ .read_avail = &ad74413r_read_avail,
+ .update_scan_mode = &ad74413r_update_scan_mode,
+};
+
+#define AD74413R_DAC_CHANNEL(_type, extra_mask_separate) \
+ { \
+ .type = (_type), \
+ .indexed = 1, \
+ .output = 1, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \
+ | (extra_mask_separate), \
+ }
+
+#define AD74413R_ADC_CHANNEL(_type, extra_mask_separate) \
+ { \
+ .type = (_type), \
+ .indexed = 1, \
+ .output = 0, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \
+ | BIT(IIO_CHAN_INFO_SAMP_FREQ) \
+ | (extra_mask_separate), \
+ .info_mask_separate_available = \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = 16, \
+ .storagebits = 32, \
+ .shift = 8, \
+ .endianness = IIO_BE, \
+ }, \
+ }
+
+#define AD74413R_ADC_VOLTAGE_CHANNEL \
+ AD74413R_ADC_CHANNEL(IIO_VOLTAGE, BIT(IIO_CHAN_INFO_SCALE) \
+ | BIT(IIO_CHAN_INFO_OFFSET))
+
+#define AD74413R_ADC_CURRENT_CHANNEL \
+ AD74413R_ADC_CHANNEL(IIO_CURRENT, BIT(IIO_CHAN_INFO_SCALE) \
+ | BIT(IIO_CHAN_INFO_OFFSET))
+
+static struct iio_chan_spec ad74413r_voltage_output_channels[] = {
+ AD74413R_DAC_CHANNEL(IIO_VOLTAGE, BIT(IIO_CHAN_INFO_SCALE)),
+ AD74413R_ADC_CURRENT_CHANNEL,
+};
+
+static struct iio_chan_spec ad74413r_current_output_channels[] = {
+ AD74413R_DAC_CHANNEL(IIO_CURRENT, BIT(IIO_CHAN_INFO_SCALE)),
+ AD74413R_ADC_VOLTAGE_CHANNEL,
+};
+
+static struct iio_chan_spec ad74413r_voltage_input_channels[] = {
+ AD74413R_ADC_VOLTAGE_CHANNEL,
+};
+
+static struct iio_chan_spec ad74413r_current_input_channels[] = {
+ AD74413R_ADC_CURRENT_CHANNEL,
+};
+
+static struct iio_chan_spec ad74413r_resistance_input_channels[] = {
+ AD74413R_ADC_CHANNEL(IIO_RESISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
+};
+
+static struct iio_chan_spec ad74413r_digital_input_channels[] = {
+ AD74413R_ADC_VOLTAGE_CHANNEL,
+};
+
+#define _AD74413R_CHANNELS(_channels) \
+ { \
+ .channels = _channels, \
+ .num_channels = ARRAY_SIZE(_channels), \
+ }
+
+#define AD74413R_CHANNELS(name) \
+ _AD74413R_CHANNELS(ad74413r_ ## name ## _channels)
+
+static const struct ad74413r_channels ad74413r_channels_map[] = {
+ [CH_FUNC_HIGH_IMPEDANCE] = AD74413R_CHANNELS(voltage_input),
+ [CH_FUNC_VOLTAGE_OUTPUT] = AD74413R_CHANNELS(voltage_output),
+ [CH_FUNC_CURRENT_OUTPUT] = AD74413R_CHANNELS(current_output),
+ [CH_FUNC_VOLTAGE_INPUT] = AD74413R_CHANNELS(voltage_input),
+ [CH_FUNC_CURRENT_INPUT_EXT_POWER] = AD74413R_CHANNELS(current_input),
+ [CH_FUNC_CURRENT_INPUT_LOOP_POWER] = AD74413R_CHANNELS(current_input),
+ [CH_FUNC_RESISTANCE_INPUT] = AD74413R_CHANNELS(resistance_input),
+ [CH_FUNC_DIGITAL_INPUT_LOGIC] = AD74413R_CHANNELS(digital_input),
+ [CH_FUNC_DIGITAL_INPUT_LOOP_POWER] = AD74413R_CHANNELS(digital_input),
+ [CH_FUNC_CURRENT_INPUT_EXT_POWER_HART] = AD74413R_CHANNELS(current_input),
+ [CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART] = AD74413R_CHANNELS(current_input),
+};
+
+static int ad74413r_parse_channel_config(struct iio_dev *indio_dev,
+ struct fwnode_handle *channel_node)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+ struct ad74413r_channel_config *config;
+ u32 index;
+ int ret;
+
+ ret = fwnode_property_read_u32(channel_node, "reg", &index);
+ if (ret) {
+ dev_err(st->dev, "Failed to read channel reg: %d\n", ret);
+ return ret;
+ }
+
+ if (index > AD74413R_CHANNEL_MAX) {
+ dev_err(st->dev, "Channel index %u is too large\n", index);
+ return -EINVAL;
+ }
+
+ config = &st->channel_configs[index];
+ if (config->initialized) {
+ dev_err(st->dev, "Channel %u already initialized\n", index);
+ return -EINVAL;
+ }
+
+ config->func = CH_FUNC_HIGH_IMPEDANCE;
+ fwnode_property_read_u32(channel_node, "adi,ch-func", &config->func);
+
+ if (config->func < CH_FUNC_MIN || config->func > CH_FUNC_MAX) {
+ dev_err(st->dev, "Invalid channel function %u\n", config->func);
+ return -EINVAL;
+ }
+
+ if (!st->chip_info->hart_support
+ && (config->func == CH_FUNC_CURRENT_INPUT_EXT_POWER_HART
+ || config->func == CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART)) {
+ dev_err(st->dev, "Unsupported HART function %u\n", config->func);
+ return -EINVAL;
+ }
+
+ if (config->func == CH_FUNC_DIGITAL_INPUT_LOGIC
+ || config->func == CH_FUNC_DIGITAL_INPUT_LOOP_POWER)
+ st->num_comparator_gpios++;
+
+ config->gpo_comparator = fwnode_property_read_bool(channel_node,
+ "adi,gpo-comparator");
+
+ if (!config->gpo_comparator)
+ st->num_gpo_gpios++;
+
+ indio_dev->num_channels += ad74413r_channels_map[config->func].num_channels;
+
+ config->initialized = true;
+
+ return 0;
+}
+
+static int ad74413r_parse_channel_configs(struct iio_dev *indio_dev)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+ struct fwnode_handle *channel_node = NULL;
+ int ret;
+
+ fwnode_for_each_available_child_node(dev_fwnode(st->dev), channel_node) {
+ ret = ad74413r_parse_channel_config(indio_dev, channel_node);
+ if (ret)
+ goto put_channel_node;
+ }
+
+ return 0;
+
+put_channel_node:
+ fwnode_handle_put(channel_node);
+
+ return ret;
+}
+
+static int ad74413r_setup_channels(struct iio_dev *indio_dev)
+{
+ struct ad74413r_state *st = iio_priv(indio_dev);
+ struct ad74413r_channel_config *config;
+ struct iio_chan_spec *channels, *chans;
+ unsigned int i, num_chans, chan_i;
+ int ret;
+
+ channels = devm_kcalloc(st->dev, sizeof(*channels),
+ indio_dev->num_channels, GFP_KERNEL);
+ if (!channels)
+ return -ENOMEM;
+
+ indio_dev->channels = channels;
+
+ for (i = 0; i < AD74413R_CHANNEL_MAX; i++) {
+ config = &st->channel_configs[i];
+ chans = ad74413r_channels_map[config->func].channels;
+ num_chans = ad74413r_channels_map[config->func].num_channels;
+
+ memcpy(channels, chans, num_chans * sizeof(*chans));
+
+ for (chan_i = 0; chan_i < num_chans; chan_i++) {
+ struct iio_chan_spec *chan = &channels[chan_i];
+
+ chan->channel = i;
+ if (chan->output)
+ chan->scan_index = -1;
+ else
+ chan->scan_index = i;
+
+ }
+
+ ret = ad74413r_set_channel_function(st, i, config->func);
+ if (ret)
+ return ret;
+
+ channels += num_chans;
+ }
+
+ return 0;
+}
+
+static int ad74413r_setup_gpios(struct ad74413r_state *st)
+{
+ struct ad74413r_channel_config *config;
+ unsigned int comp_gpio_i = 0;
+ unsigned int gpo_gpio_i = 0;
+ unsigned int i;
+ u8 gpo_config;
+ int ret;
+
+ for (i = 0; i < AD74413R_CHANNEL_MAX; i++) {
+ config = &st->channel_configs[i];
+
+ if (config->gpo_comparator) {
+ gpo_config = AD74413R_GPO_CONFIG_COMPARATOR;
+ } else {
+ gpo_config = AD74413R_GPO_CONFIG_LOGIC;
+ st->gpo_gpio_offsets[gpo_gpio_i++] = i;
+ }
+
+ if (config->func == CH_FUNC_DIGITAL_INPUT_LOGIC
+ || config->func == CH_FUNC_DIGITAL_INPUT_LOOP_POWER)
+ st->comp_gpio_offsets[comp_gpio_i++] = i;
+
+ ret = ad74413r_set_gpo_config(st, i, gpo_config);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void ad74413r_regulator_disable(void *regulator)
+{
+ regulator_disable(regulator);
+}
+
+static int ad74413r_probe(struct spi_device *spi)
+{
+ struct ad74413r_state *st;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+ if (indio_dev == NULL)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+
+ st->spi = spi;
+ st->dev = &spi->dev;
+ st->chip_info = device_get_match_data(&spi->dev);
+ mutex_init(&st->lock);
+ init_completion(&st->adc_data_completion);
+
+ st->regmap = devm_regmap_init(st->dev, NULL, st,
+ &ad74413r_regmap_config);
+ if (IS_ERR(st->regmap))
+ return PTR_ERR(st->regmap);
+
+ st->refin_reg = devm_regulator_get(st->dev, "refin");
+ if (IS_ERR(st->refin_reg))
+ return dev_err_probe(st->dev, PTR_ERR(st->refin_reg),
+ "Failed to get refin regulator\n");
+
+ ret = regulator_enable(st->refin_reg);
+ if (ret)
+ return ret;
+
+ ret = devm_add_action_or_reset(st->dev, ad74413r_regulator_disable,
+ st->refin_reg);
+ if (ret)
+ return ret;
+
+ st->rsense_resistance_ohms = 100;
+ device_property_read_u32(st->dev, "adi,rsense-resistance-ohms",
+ &st->rsense_resistance_ohms);
+
+ st->trig = devm_iio_trigger_alloc(st->dev, "%s-dev%d",
+ st->chip_info->name, iio_device_id(indio_dev));
+ if (!st->trig)
+ return -ENOMEM;
+
+ st->trig->ops = &ad74413r_trigger_ops;
+ iio_trigger_set_drvdata(st->trig, st);
+
+ ret = devm_iio_trigger_register(st->dev, st->trig);
+ if (ret)
+ return ret;
+
+ indio_dev->name = st->chip_info->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &ad74413r_info;
+ indio_dev->trig = iio_trigger_get(st->trig);
+
+ ret = ad74413r_reset(st);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_parse_channel_configs(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_setup_channels(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = ad74413r_setup_gpios(st);
+ if (ret)
+ return ret;
+
+ if (st->num_gpo_gpios) {
+ st->gpo_gpiochip.owner = THIS_MODULE;
+ st->gpo_gpiochip.label = st->chip_info->name;
+ st->gpo_gpiochip.base = -1;
+ st->gpo_gpiochip.ngpio = st->num_gpo_gpios;
+ st->gpo_gpiochip.parent = st->dev;
+ st->gpo_gpiochip.can_sleep = true;
+ st->gpo_gpiochip.set = ad74413r_gpio_set;
+ st->gpo_gpiochip.set_multiple = ad74413r_gpio_set_multiple;
+ st->gpo_gpiochip.set_config = ad74413r_gpio_set_gpo_config;
+ st->gpo_gpiochip.get_direction =
+ ad74413r_gpio_get_gpo_direction;
+
+ ret = devm_gpiochip_add_data(st->dev, &st->gpo_gpiochip, st);
+ if (ret)
+ return ret;
+ }
+
+ if (st->num_comparator_gpios) {
+ st->comp_gpiochip.owner = THIS_MODULE;
+ st->comp_gpiochip.label = st->chip_info->name;
+ st->comp_gpiochip.base = -1;
+ st->comp_gpiochip.ngpio = st->num_comparator_gpios;
+ st->comp_gpiochip.parent = st->dev;
+ st->comp_gpiochip.can_sleep = true;
+ st->comp_gpiochip.get = ad74413r_gpio_get;
+ st->comp_gpiochip.get_multiple = ad74413r_gpio_get_multiple;
+ st->comp_gpiochip.set_config = ad74413r_gpio_set_comp_config;
+ st->comp_gpiochip.get_direction =
+ ad74413r_gpio_get_comp_direction;
+
+ ret = devm_gpiochip_add_data(st->dev, &st->comp_gpiochip, st);
+ if (ret)
+ return ret;
+ }
+
+ ret = ad74413r_set_adc_conv_seq(st, AD74413R_CONV_SEQ_OFF);
+ if (ret)
+ return ret;
+
+ ret = devm_request_irq(st->dev, spi->irq, ad74413r_adc_data_interrupt,
+ 0, st->chip_info->name, indio_dev);
+ if (ret)
+ return ret;
+
+ ret = devm_iio_triggered_buffer_setup(st->dev, indio_dev,
+ &iio_pollfunc_store_time,
+ &ad74413r_trigger_handler,
+ &ad74413r_buffer_ops);
+ if (ret)
+ return ret;
+
+ return devm_iio_device_register(st->dev, indio_dev);
+}
+
+static int ad74413r_unregister_driver(struct spi_driver *spi)
+{
+ spi_unregister_driver(spi);
+
+ return 0;
+}
+
+static int __init ad74413r_register_driver(struct spi_driver *spi)
+{
+ crc8_populate_msb(ad74413r_crc8_table, AD74413R_CRC_POLYNOMIAL);
+
+ return spi_register_driver(spi);
+}
+
+static const struct ad74413r_chip_info ad74412r_chip_info_data = {
+ .hart_support = false,
+ .name = "ad74412r",
+};
+
+static const struct ad74413r_chip_info ad74413r_chip_info_data = {
+ .hart_support = true,
+ .name = "ad74413r",
+};
+
+static const struct of_device_id ad74413r_dt_id[] = {
+ {
+ .compatible = "adi,ad74412r",
+ .data = &ad74412r_chip_info_data,
+ },
+ {
+ .compatible = "adi,ad74413r",
+ .data = &ad74413r_chip_info_data,
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ad74413r_dt_id);
+
+static struct spi_driver ad74413r_driver = {
+ .driver = {
+ .name = "ad74413r",
+ .of_match_table = ad74413r_dt_id,
+ },
+ .probe = ad74413r_probe,
+};
+
+module_driver(ad74413r_driver,
+ ad74413r_register_driver,
+ ad74413r_unregister_driver);
+
+MODULE_AUTHOR("Cosmin Tanislav <cosmin.tanislav@...log.com>");
+MODULE_DESCRIPTION("Analog Devices AD74413R ADDAC");
+MODULE_LICENSE("GPL v2");
--
2.34.1
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