Add IIO ADDAC driver for AD74413R. Signed-off-by: Cosmin Tanislav <cosmin.tanislav@xxxxxxxxxx> --- MAINTAINERS | 9 + drivers/iio/addac/Kconfig | 12 + drivers/iio/addac/Makefile | 1 + drivers/iio/addac/ad74413r.c | 1389 ++++++++++++++++++++++++++++++++++ 4 files changed, 1411 insertions(+) create mode 100644 drivers/iio/addac/ad74413r.c diff --git a/MAINTAINERS b/MAINTAINERS index 37982beaf91f..174f0fd3d71c 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@xxxxxxxxxx> +L: linux-iio@xxxxxxxxxxxxxxx +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@xxxxxxxxx> L: linux-media@xxxxxxxxxxxxxxx diff --git a/drivers/iio/addac/Kconfig b/drivers/iio/addac/Kconfig index 2e64d7755d5e..06b26f8d0144 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 AD74413R/AD74412R driver" + depends on GPIOLIB && SPI + select REGMAP_SPI + select CRC8 + help + Say yes here to build support for Analog Devices AD74413R/AD74412R + 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..76d2e09a17ee --- /dev/null +++ b/drivers/iio/addac/ad74413r.c @@ -0,0 +1,1389 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 Analog Devices, Inc. + * Author: Cosmin Tanislav <cosmin.tanislav@xxxxxxxxxx> + */ + +#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/module.h> +#include <linux/of.h> +#include <linux/of_device.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 + +struct ad74413r_config { + bool hart_support; +}; + +struct ad74413r_channel_config { + u32 gpo_config; + u32 func; + bool initialized; +}; + +struct ad74413r_state { + struct ad74413r_channel_config channel_configs[AD74413R_CHANNEL_MAX]; + struct gpio_chip gpiochip; + struct mutex lock; + struct completion adc_data_completion; + + struct spi_device *spi; + struct iio_dev *indio_dev; + struct regulator *refin_reg; + struct regmap *regmap; + struct device *dev; + struct iio_trigger *trig; + const struct ad74413r_config *config; + + u32 rsense_resistance_ohms; + + size_t adc_active_channels; + struct spi_message adc_samples_msg; + struct spi_transfer adc_samples_xfer[AD74413R_CHANNEL_MAX + 1]; + struct { + __be32 rx_buf[AD74413R_CHANNEL_MAX]; + s64 timestamp; + } adc_samples ____cacheline_aligned; + __be32 adc_samples_tx_buf[AD74413R_CHANNEL_MAX]; + __be32 regmap_tx_buf; + __be32 regmap_rx_buf; +}; + +#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_DAC_CODE_X(x) (0x16 + (x)) +#define AD74413R_DAC_CODE_MAX ((1 << 13) - 1) + +#define AD74413R_REG_GPO_PAR_DATA 0x0d +#define AD74413R_REG_GPO_CONFIG_X(x) (0x0e + (x)) +#define AD74413R_GPO_CONFIG_GPO_DATA_MASK BIT(3) +#define AD74413R_GPO_CONFIG_DATA_LOW 0 +#define AD74413R_GPO_CONFIG_DATA_HIGH AD74413R_GPO_CONFIG_GPO_DATA_MASK +#define AD74413R_GPO_CONFIG_GPO_SELECT_MASK GENMASK(2, 0) + +#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_CH_EN_SHIFT(x) x + +#define AD74413R_REG_DIN_COMP_OUT 0x25 +#define AD74413R_DIN_COMP_OUT_MASK_X(x) BIT(x) +#define AD74413R_DIN_COMP_OUT_SHIFT_X(x) x + +#define AD74413R_REG_ADC_RESULT_X(x) (0x26 + (x)) +#define AD74413R_ADC_RESULT_MAX ((1 << 16) - 1) + +#define AD74413R_REG_READ_SELECT 0x41 + +#define AD74413R_REG_CMD_KEY 0x44 +#define AD74413R_CMD_KEY_LDAC 0x953a + +#define AD74413R_REG_SILLICON_REV 0x46 +#define AD74413R_SILLICON_REV_ID_MASK GENMASK(7, 0) +#define AD74413R_SILLICON_REV_ID_EXPECTED 0x8 + +#define AD74413R_ADC_DATA_TIMEOUT 1000 + +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(unsigned int reg, unsigned int val, u8 *buf) +{ + buf[0] = reg & 0xff; + buf[1] = (val >> 8) & 0xff; + buf[2] = val & 0xff; + buf[3] = ad74413r_crc(buf); +} + +static int ad74413r_reg_write(void *context, unsigned int reg, unsigned int val) +{ + struct device *dev = context; + struct spi_device *spi = to_spi_device(dev); + struct ad74413r_state *st = spi_get_drvdata(spi); + u8 *buf = (u8 *)&st->regmap_tx_buf; + + ad74413r_format_reg_write(reg, val, buf); + + return spi_write(spi, buf, 4); +} + +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, data: %02x%02x%02x, expected: %02x, received: %02x\n", + buf[0], buf[1], buf[2], expected_crc, buf[3]); + return -EINVAL; + } + + return 0; +} + +static int ad74413r_reg_read_raw(void *context, unsigned int reg, u8 *buf, + unsigned int count) +{ + struct device *dev = context; + struct spi_device *spi = to_spi_device(dev); + struct ad74413r_state *st = spi_get_drvdata(spi); + unsigned int i; + int ret; + + ret = ad74413r_reg_write(context, AD74413R_REG_READ_SELECT, reg); + if (ret) { + dev_err(dev, "Failed to write read select register: %d\n", ret); + return ret; + } + + for (i = 0; i < count; i++, buf += 4) { + ret = spi_read(spi, buf, 4); + if (ret) + return ret; + + ret = ad74413r_crc_check(st, buf); + if (ret) + return ret; + } + + return 0; +} + +static int ad74413r_reg_read(void *context, unsigned int reg, unsigned int *val) +{ + struct device *dev = context; + struct spi_device *spi = to_spi_device(dev); + struct ad74413r_state *st = spi_get_drvdata(spi); + u8 *buf = (u8 *)&st->regmap_rx_buf; + int ret; + + ret = ad74413r_reg_read_raw(context, reg, buf, 1); + if (ret) + return ret; + + *val = (buf[1] << 8) | buf[2]; + + 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_mode(struct ad74413r_state *st, unsigned int offset, u8 mode) +{ + if (mode < GPO_CONFIG_MIN || mode > GPO_CONFIG_MAX) { + dev_err(st->dev, "Invalid gpo config select mode\n"); + return -EINVAL; + } + + return regmap_update_bits(st->regmap, AD74413R_REG_GPO_CONFIG_X(offset), + AD74413R_GPO_CONFIG_GPO_SELECT_MASK, mode); +} + +static void ad74413r_gpio_set(struct gpio_chip *chip, unsigned int offset, int val) +{ + struct ad74413r_state *st = gpiochip_get_data(chip); + struct ad74413r_channel_config *channel_config = &st->channel_configs[offset]; + int ret; + + if (channel_config->gpo_config != GPO_CONFIG_LOGIC) { + dev_err(st->dev, "Cannot set gpo %u, not in logic mode", offset); + return; + } + + ret = ad74413r_set_gpo_mode(st, offset, GPO_CONFIG_LOGIC); + if (ret) + return; + + regmap_update_bits(st->regmap, AD74413R_REG_GPO_CONFIG_X(offset), + AD74413R_GPO_CONFIG_GPO_DATA_MASK, + val ? AD74413R_GPO_CONFIG_DATA_HIGH + : AD74413R_GPO_CONFIG_DATA_LOW); +} + +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 int offset = 0; + int ret; + + for_each_set_bit_from(offset, mask, AD74413R_CHANNEL_MAX) { + struct ad74413r_channel_config *channel_config = &st->channel_configs[offset]; + + if (channel_config->gpo_config != GPO_CONFIG_LOGIC) { + dev_err(st->dev, "Cannot set gpo %u, not in logic mode\n", offset); + continue; + } + + ret = ad74413r_set_gpo_mode(st, offset, GPO_CONFIG_LOGIC_PARALLEL); + if (ret) + return; + } + + regmap_update_bits(st->regmap, AD74413R_REG_GPO_PAR_DATA, *mask, *bits); +} + +static int ad74413r_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct ad74413r_state *st = gpiochip_get_data(chip); + struct ad74413r_channel_config *channel_config = &st->channel_configs[offset]; + unsigned int status; + int ret; + + if (channel_config->gpo_config != GPO_CONFIG_DEBOUNCED_COMPARATOR) { + dev_err(st->dev, "Cannot get gpo %u, not in comparator mode\n", offset); + return -EINVAL; + } + + ret = regmap_read(st->regmap, AD74413R_REG_DIN_COMP_OUT, &status); + if (ret) + return ret; + + status &= AD74413R_DIN_COMP_OUT_MASK_X(offset); + status >>= AD74413R_DIN_COMP_OUT_SHIFT_X(offset); + + return status; +} + +static int ad74413r_set_channel_dac_code(struct ad74413r_state *st, unsigned int channel, + uint16_t dac_code) +{ + int ret; + + if (dac_code > AD74413R_DAC_CODE_MAX) { + dev_err(st->dev, "Invalid dac code %d\n", dac_code); + return -EINVAL; + } + + ret = regmap_write(st->regmap, AD74413R_REG_DAC_CODE_X(channel), dac_code); + if (ret) + return ret; + + ret = regmap_write(st->regmap, AD74413R_REG_CMD_KEY, AD74413R_CMD_KEY_LDAC); + if (ret) + return ret; + + return 0; +} + +static int ad74413r_channel_set_function(struct ad74413r_state *st, unsigned int channel, u8 func) +{ + if (func < CH_FUNC_MIN || func > CH_FUNC_MAX) { + dev_err(st->dev, "Invalid channel function %d\n", func); + return -EINVAL; + } + + if (!st->config->hart_support && (func == CH_FUNC_CURRENT_INPUT_EXT_POWER_HART + || func == CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART)) { + dev_err(st->dev, "HART function not supported %d\n", func); + return -EINVAL; + } + + 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 to enable the conversion. + */ + 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) +{ + unsigned int val = status << AD74413R_CH_EN_SHIFT(channel); + + return regmap_update_bits(st->regmap, AD74413R_REG_ADC_CONV_CTRL, + AD74413R_CH_EN_MASK(channel), val); +} + +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) +{ + if (!st->config->hart_support && (val == AD74413R_ADC_REJECTION_50_60_HART + || val == AD74413R_ADC_REJECTION_HART)) { + dev_err(st->dev, "HART rate not supported %d\n", val); + return -EINVAL; + } + + 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_get_adc_rate(struct ad74413r_state *st, unsigned int channel, int *val) +{ + unsigned int rej; + int ret; + + ret = ad74413r_get_adc_rejection(st, channel, &rej); + if (ret) + return ret; + + switch (rej) { + case AD74413R_ADC_REJECTION_50_60: + *val = 20; + break; + case AD74413R_ADC_REJECTION_NONE: + *val = 4800; + break; + case AD74413R_ADC_REJECTION_50_60_HART: + *val = 10; + break; + case AD74413R_ADC_REJECTION_HART: + *val = 1200; + break; + default: + dev_err(st->dev, "Channel %u ADC rejection invalid\n", channel); + return -EINVAL; + } + + return IIO_VAL_INT; +} + +static int ad74413r_set_adc_rate(struct ad74413r_state *st, unsigned int channel, int val) +{ + unsigned int rej; + + switch (val) { + case 20: + rej = AD74413R_ADC_REJECTION_50_60; + break; + case 4800: + rej = AD74413R_ADC_REJECTION_NONE; + break; + case 10: + rej = AD74413R_ADC_REJECTION_50_60_HART; + break; + case 1200: + rej = AD74413R_ADC_REJECTION_HART; + break; + default: + dev_err(st->dev, "Channel %u ADC rate invalid\n", channel); + return -EINVAL; + } + + return ad74413r_set_adc_rejection(st, channel, rej); +} + +static int ad74413r_get_adc_voltage_range(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; + + switch (range) { + case AD74413R_ADC_RANGE_10V: + *val = 10000; + break; + case AD74413R_ADC_RANGE_2P5V_EXT_POW: + case AD74413R_ADC_RANGE_2P5V_INT_POW: + *val = 2500; + break; + case AD74413R_ADC_RANGE_5V_BI_DIR: + *val = 5000; + break; + default: + dev_err(st->dev, "Channel %u ADC range invalid\n", channel); + return -EINVAL; + } + + return 0; +} + +static int ad74413r_get_adc_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; + + switch (range) { + case AD74413R_ADC_RANGE_10V: + case AD74413R_ADC_RANGE_2P5V_EXT_POW: + *val = 0; + break; + case AD74413R_ADC_RANGE_2P5V_INT_POW: + case AD74413R_ADC_RANGE_5V_BI_DIR: + *val = -2500; + break; + default: + dev_err(st->dev, "Channel %u ADC range invalid\n", channel); + return -EINVAL; + } + + return 0; +} + +static int ad74413r_get_input_voltage_scale(struct ad74413r_state *st, unsigned int channel, + int *val, int *val2) +{ + int ret; + + ret = ad74413r_get_adc_voltage_range(st, channel, 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, int *val2) +{ + unsigned int range; + int ret; + + ret = ad74413r_get_adc_range(st, channel, &range); + if (ret) + return ret; + + switch (range) { + case AD74413R_ADC_RANGE_10V: + case AD74413R_ADC_RANGE_2P5V_EXT_POW: + *val = 0; + break; + case AD74413R_ADC_RANGE_2P5V_INT_POW: + *val = -AD74413R_ADC_RESULT_MAX; + break; + case AD74413R_ADC_RANGE_5V_BI_DIR: + *val = -AD74413R_ADC_RESULT_MAX / 2; + break; + default: + dev_err(st->dev, "Channel %u ADC range invalid\n", channel); + return -EINVAL; + } + + *val2 = 0; + + return IIO_VAL_INT; +} + +static int ad74413r_get_input_current_scale(struct ad74413r_state *st, unsigned int channel, + int *val, int *val2) +{ + int ret; + + ret = ad74413r_get_adc_voltage_range(st, channel, 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, int *val2) +{ + int range; + int offset; + int ret; + + ret = ad74413r_get_adc_voltage_range(st, channel, &range); + if (ret) + return ret; + + ret = ad74413r_get_adc_voltage_offset(st, channel, &offset); + if (ret) + return ret; + + *val = offset * AD74413R_ADC_RESULT_MAX / range; + *val2 = 0; + + return IIO_VAL_INT; +} + +static int ad74413r_get_output_voltage_scale(struct ad74413r_state *st, + int *val, int *val2) +{ + *val = 11000; + *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 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); + unsigned int i; + int ret; + + mutex_lock(&st->lock); + + 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, (u8 *)&st->adc_samples.rx_buf[i]); + + iio_push_to_buffers_with_timestamp(indio_dev, &st->adc_samples, + iio_get_time_ns(indio_dev)); + +out: + iio_trigger_notify_done(indio_dev->trig); + + mutex_unlock(&st->lock); + + return IRQ_HANDLED; +} + +static irqreturn_t ad74413r_adc_data_interrupt(int irq, void *data) +{ + struct ad74413r_state *st = data; + + if (iio_buffer_enabled(st->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; + + ret = iio_device_claim_direct_mode(st->indio_dev); + if (ret) + return ret; + + reinit_completion(&st->adc_data_completion); + + ret = ad74413r_set_adc_channel_enable(st, channel, true); + if (ret) + goto out; + + ret = ad74413r_set_adc_conv_seq(st, AD74413R_CONV_SEQ_SINGLE); + if (ret) + goto out; + + ret = wait_for_completion_timeout(&st->adc_data_completion, + msecs_to_jiffies(AD74413R_ADC_DATA_TIMEOUT)); + if (!ret) { + ret = -ETIMEDOUT; + goto out; + } + + ret = regmap_read(st->regmap, AD74413R_REG_ADC_RESULT_X(channel), &uval); + if (ret) + goto out; + + ret = ad74413r_set_adc_conv_seq(st, AD74413R_CONV_SEQ_OFF); + if (ret) + goto out; + + ret = ad74413r_set_adc_channel_enable(st, channel, false); + if (ret) + goto out; + + *val = uval; + ret = IIO_VAL_INT; + +out: + iio_device_release_direct_mode(st->indio_dev); + + return ret; +} + +static int ad74413r_get_single_resistance_result(struct ad74413r_state *st, unsigned int channel, + int *val) +{ + unsigned int uval; + int ret; + + ret = ad74413r_get_single_adc_result(st, channel, &uval); + if (ret < 0) + return ret; + + if (uval == AD74413R_ADC_RESULT_MAX) + *val = 0; + else + *val = DIV_ROUND_CLOSEST(uval * 2100, AD74413R_ADC_RESULT_MAX - uval); + + return ret; +} + +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; + unsigned int channel; + int transfer_index = 0; + int ret; + + mutex_lock(&st->lock); + + spi_message_init(&st->adc_samples_msg); + st->adc_active_channels = 0; + + for (channel = 0; channel < AD74413R_CHANNEL_MAX; channel++) { + bool status = test_bit(channel, active_scan_mask); + u8 *tx_buf; + + ret = ad74413r_set_adc_channel_enable(st, channel, status); + if (ret) + goto out; + + if (!status) + continue; + + st->adc_active_channels++; + + xfer = &st->adc_samples_xfer[transfer_index]; + + if (transfer_index == 0) + xfer->rx_buf = NULL; + else + xfer->rx_buf = &st->adc_samples.rx_buf[transfer_index - 1]; + + tx_buf = (u8 *)&st->adc_samples_tx_buf[transfer_index]; + + xfer->tx_buf = tx_buf; + xfer->len = 4; + 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); + + transfer_index++; + } + + if (transfer_index == 0) + goto out; + + xfer = &st->adc_samples_xfer[transfer_index]; + + xfer->tx_buf = NULL; + xfer->rx_buf = &st->adc_samples.rx_buf[transfer_index - 1]; + xfer->len = 4; + 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); + int ret = -EINVAL; + + mutex_lock(&st->lock); + + switch (info) { + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_ALTVOLTAGE: + if (chan->output) + ret = ad74413r_get_output_voltage_scale(st, val, val2); + else + ret = ad74413r_get_input_voltage_scale(st, chan->channel, + val, val2); + break; + + case IIO_CURRENT: + if (chan->output) + ret = ad74413r_get_output_current_scale(st, val, val2); + else + ret = ad74413r_get_input_current_scale(st, chan->channel, + val, val2); + break; + default: + break; + } + break; + case IIO_CHAN_INFO_OFFSET: + switch (chan->type) { + case IIO_ALTVOLTAGE: + if (!chan->output) + ret = ad74413r_get_input_voltage_offset(st, chan->channel, + val, val2); + break; + case IIO_CURRENT: + if (!chan->output) + ret = ad74413_get_input_current_offset(st, chan->channel, + val, val2); + break; + default: + break; + } + break; + case IIO_CHAN_INFO_RAW: + if (!chan->output) + ret = ad74413r_get_single_adc_result(st, chan->channel, val); + break; + case IIO_CHAN_INFO_PROCESSED: + switch (chan->type) { + case IIO_RESISTANCE: + if (!chan->output) + ret = ad74413r_get_single_resistance_result(st, chan->channel, + val); + break; + default: + break; + } + break; + case IIO_CHAN_INFO_SAMP_FREQ: + if (!chan->output) + ret = ad74413r_get_adc_rate(st, chan->channel, val); + break; + default: + break; + } + + mutex_unlock(&st->lock); + + return ret; +} + +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); + int ret = -EINVAL; + + mutex_lock(&st->lock); + + switch (info) { + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_ALTVOLTAGE: + case IIO_CURRENT: + ret = ad74413r_set_channel_dac_code(st, chan->channel, val); + break; + default: + break; + } + break; + case IIO_CHAN_INFO_SAMP_FREQ: + if (!chan->output) + ret = ad74413r_set_adc_rate(st, chan->channel, val); + break; + default: + break; + } + + mutex_unlock(&st->lock); + + return ret; +} + +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); + int ret = -EINVAL; + + switch (info) { + case IIO_CHAN_INFO_SAMP_FREQ: + if (st->config->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; + ret = IIO_AVAIL_LIST; + break; + default: + break; + } + + return ret; +} + +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_CHANNEL(_type, _output, extra_mask_separate) \ + .type = _type, \ + .indexed = 1, \ + .output = _output, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | extra_mask_separate + +#define AD74413R_DAC_CHANNEL(_type, extra_mask_separate) \ + { \ + AD74413R_CHANNEL(_type, 1, extra_mask_separate), \ + } + +#define AD74413R_ADC_CHANNEL(_type, extra_mask_separate) \ + { \ + AD74413R_CHANNEL(_type, 0, extra_mask_separate | BIT(IIO_CHAN_INFO_SAMP_FREQ)), \ + .info_mask_shared_by_type_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_ALTVOLTAGE, 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_high_impedance_channels[] = { + AD74413R_ADC_VOLTAGE_CHANNEL, +}; + +static struct iio_chan_spec ad74413r_voltage_output_channels[] = { + AD74413R_DAC_CHANNEL(IIO_ALTVOLTAGE, 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, +}; + +static int ad74413r_of_parse_channel_config(struct ad74413r_state *st, + struct device_node *channel_node) +{ + struct ad74413r_channel_config *channel_config; + u32 index; + int ret; + + ret = of_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; + } + + channel_config = &st->channel_configs[index]; + if (channel_config->initialized) { + dev_err(st->dev, "Channel %u has already been initialized\n", index); + return -EINVAL; + } + + channel_config->func = CH_FUNC_HIGH_IMPEDANCE; + of_property_read_u32(channel_node, "adi,ch-func", &channel_config->func); + + channel_config->gpo_config = GPO_CONFIG_100K_PULL_DOWN; + of_property_read_u32(channel_node, "adi,gpo-config", &channel_config->gpo_config); + + if (channel_config->gpo_config == GPO_CONFIG_LOGIC_PARALLEL) { + dev_err(st->dev, "GPO config logic parallel is unsupported\n"); + return -EINVAL; + } + + ret = ad74413r_channel_set_function(st, index, channel_config->func); + if (ret) + return ret; + + ret = ad74413r_set_gpo_mode(st, index, channel_config->gpo_config); + if (ret) + return ret; + + channel_config->initialized = true; + + return 0; +} + +static int ad74413r_parse_channel_configs(struct ad74413r_state *st) +{ + struct device_node *channel_node = NULL; + int ret; + + for_each_available_child_of_node(st->dev->of_node, channel_node) { + if (!of_node_name_eq(channel_node, "channel")) + continue; + + ret = ad74413r_of_parse_channel_config(st, channel_node); + if (ret) { + dev_err(st->dev, "Failed to parse channel %s config: %d\n", + channel_node->name, ret); + goto put_channel_node; + } + } + +put_channel_node: + of_node_put(channel_node); + + return ret; +} + +static int ad74413r_get_iio_channels(struct ad74413r_state *st, u8 func, + struct iio_chan_spec **iio_channels, unsigned int *count) +{ + switch (func) { + case CH_FUNC_HIGH_IMPEDANCE: + *iio_channels = ad74413r_high_impedance_channels; + *count = ARRAY_SIZE(ad74413r_high_impedance_channels); + break; + case CH_FUNC_VOLTAGE_OUTPUT: + *iio_channels = ad74413r_voltage_output_channels; + *count = ARRAY_SIZE(ad74413r_voltage_output_channels); + break; + case CH_FUNC_CURRENT_OUTPUT: + *iio_channels = ad74413r_current_output_channels; + *count = ARRAY_SIZE(ad74413r_current_output_channels); + break; + case CH_FUNC_VOLTAGE_INPUT: + *iio_channels = ad74413r_voltage_input_channels; + *count = ARRAY_SIZE(ad74413r_voltage_input_channels); + break; + case CH_FUNC_CURRENT_INPUT_EXT_POWER: + case CH_FUNC_CURRENT_INPUT_LOOP_POWER: + case CH_FUNC_CURRENT_INPUT_EXT_POWER_HART: + case CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART: + *iio_channels = ad74413r_current_input_channels; + *count = ARRAY_SIZE(ad74413r_current_input_channels); + break; + case CH_FUNC_RESISTANCE_INPUT: + *iio_channels = ad74413r_resistance_input_channels; + *count = ARRAY_SIZE(ad74413r_resistance_input_channels); + break; + case CH_FUNC_DIGITAL_INPUT_LOGIC: + case CH_FUNC_DIGITAL_INPUT_LOOP_POWER: + *iio_channels = ad74413r_digital_input_channels; + *count = ARRAY_SIZE(ad74413r_digital_input_channels); + break; + default: + dev_err(st->dev, "Unhandled channel config function %d\n", func); + return -EINVAL; + } + + return 0; +} + +static int ad74413r_count_iio_channels(struct ad74413r_state *st) +{ + unsigned int index; + int ret; + + st->indio_dev->num_channels = 0; + + for (index = 0; index < AD74413R_CHANNEL_MAX; index++) { + struct ad74413r_channel_config *channel_config = &st->channel_configs[index]; + struct iio_chan_spec *local_channels; + unsigned int num_local_channels; + + ret = ad74413r_get_iio_channels(st, channel_config->func, &local_channels, + &num_local_channels); + if (ret) + return ret; + + st->indio_dev->num_channels += num_local_channels; + } + + return 0; +} + +static int ad74413r_setup_iio_channels(struct ad74413r_state *st) +{ + struct iio_chan_spec *channels; + unsigned int index; + int ret; + + channels = devm_kcalloc(st->dev, sizeof(*channels), + st->indio_dev->num_channels, GFP_KERNEL); + if (!channels) + return -ENOMEM; + + st->indio_dev->channels = channels; + + for (index = 0; index < AD74413R_CHANNEL_MAX; index++) { + struct ad74413r_channel_config *channel_config = &st->channel_configs[index]; + struct iio_chan_spec *local_channels; + unsigned int num_local_channels; + unsigned int chan_index; + + ret = ad74413r_get_iio_channels(st, channel_config->func, &local_channels, + &num_local_channels); + if (ret) + return ret; + + memcpy(channels, local_channels, num_local_channels * sizeof(*local_channels)); + + for (chan_index = 0; chan_index < num_local_channels; chan_index++) { + struct iio_chan_spec *local_channel = &channels[chan_index]; + + local_channel->channel = index; + if (local_channel->output) + local_channel->scan_index = -1; + else + local_channel->scan_index = index; + + } + + channels += num_local_channels; + } + + 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; + unsigned int sillicon_rev_id; + const char *name; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (indio_dev == NULL) + return -ENOMEM; + + st = iio_priv(indio_dev); + spi_set_drvdata(spi, st); + + st->spi = spi; + st->dev = &spi->dev; + st->config = of_device_get_match_data(&spi->dev); + st->indio_dev = indio_dev; + mutex_init(&st->lock); + init_completion(&st->adc_data_completion); + + name = dev_name(st->dev); + + st->regmap = devm_regmap_init(st->dev, NULL, &spi->dev, &ad74413r_regmap_config); + if (IS_ERR(st->regmap)) { + ret = PTR_ERR(st->regmap); + dev_err(st->dev, "Failed to create regmap: %d\n", ret); + return ret; + } + + ret = regmap_read(st->regmap, AD74413R_REG_SILLICON_REV, &sillicon_rev_id); + if (ret) { + dev_err(st->dev, "Failed to read sillicon rev: %d\n", ret); + return ret; + } + + sillicon_rev_id = FIELD_GET(AD74413R_SILLICON_REV_ID_MASK, sillicon_rev_id); + if (sillicon_rev_id != AD74413R_SILLICON_REV_ID_EXPECTED) { + dev_err(st->dev, "Read sillicon rev id %d does not match expected rev id %d\n", + sillicon_rev_id, AD74413R_SILLICON_REV_ID_EXPECTED); + return -EINVAL; + } + + st->refin_reg = devm_regulator_get(st->dev, "refin"); + if (IS_ERR(st->refin_reg)) { + dev_err(st->dev, "Failed to get refin regulator: %d\n", ret); + return PTR_ERR(st->refin_reg); + } + + ret = regulator_enable(st->refin_reg); + if (ret) { + dev_err(st->dev, "Failed to enable refin regulator: %d\n", ret); + return ret; + } + + ret = devm_add_action_or_reset(st->dev, ad74413r_regulator_disable, + st->refin_reg); + if (ret) { + dev_err(st->dev, "Failed to add refin regulator disable action: %d\n", ret); + return ret; + } + + ret = of_property_read_u32(st->dev->of_node, "adi,rsense-resistance-ohms", + &st->rsense_resistance_ohms); + if (ret) { + dev_err(st->dev, "Failed to get rsense resistance: %d\n", ret); + return ret; + } + + st->gpiochip.label = name; + st->gpiochip.base = -1; + st->gpiochip.ngpio = AD74413R_CHANNEL_MAX; + st->gpiochip.parent = st->dev; + st->gpiochip.can_sleep = true; + st->gpiochip.set = ad74413r_gpio_set; + st->gpiochip.set_multiple = ad74413r_gpio_set_multiple; + st->gpiochip.owner = THIS_MODULE; + st->gpiochip.get = ad74413r_gpio_get; + + ret = devm_gpiochip_add_data(st->dev, &st->gpiochip, st); + if (ret) { + dev_err(st->dev, "Failed to add gpio chip: %d\n", ret); + return ret; + } + + st->trig = devm_iio_trigger_alloc(st->dev, "%s-dev%d", name, indio_dev->id); + if (!st->trig) + return -ENOMEM; + + st->trig->ops = &ad74413r_trigger_ops; + st->trig->dev.parent = st->dev; + iio_trigger_set_drvdata(st->trig, st); + + ret = devm_iio_trigger_register(st->dev, st->trig); + if (ret) + return ret; + + indio_dev->dev.parent = st->dev; + indio_dev->name = name; + indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE; + indio_dev->info = &ad74413r_info; + indio_dev->trig = iio_trigger_get(st->trig); + + ret = ad74413r_parse_channel_configs(st); + if (ret) + return ret; + + ret = ad74413r_count_iio_channels(st); + if (ret) + return ret; + + ret = ad74413r_setup_iio_channels(st); + if (ret) { + dev_err(st->dev, "Failed to setup iio channels: %d\n", 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, + IRQF_TRIGGER_FALLING, name, st); + if (ret) { + dev_err(st->dev, "Failed to request threaded irq: %d\n", 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) { + dev_err(st->dev, "Failed to setup triggered buffer: %d\n", 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_config ad74412r_config_data = { + .hart_support = false, +}; + +static const struct ad74413r_config ad74413r_config_data = { + .hart_support = true, +}; + +static const struct of_device_id ad74413r_dt_id[] = { + { + .compatible = "adi,ad74412r", + .data = &ad74412r_config_data, + }, + { + .compatible = "adi,ad74413r", + .data = &ad74413r_config_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@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Analog Devices AD74413R ADDAC"); +MODULE_LICENSE("GPL v2"); -- 2.33.0
