[PATCH 2/2] iio: adc: ad717x: add AD717X driver
From: Dumitru Ceclan
Date: Thu Aug 10 2023 - 05:34:59 EST
The AD717x family offer a complete integrated Sigma-Delta ADC solution
which can be used in high precision, low noise single channel
applications or higher speed multiplexed applications. The Sigma-Delta
ADC is intended primarily for measurement of signals close to DC but also
delivers outstanding performance with input bandwidths out to ~10kHz.
Signed-off-by: Dumitru Ceclan <mitrutzceclan@xxxxxxxxx>
---
drivers/iio/adc/Kconfig | 7 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ad717x.c | 999 +++++++++++++++++++++++++++++++++++++++
3 files changed, 1007 insertions(+)
create mode 100644 drivers/iio/adc/ad717x.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index dc14bde31ac1..294a48b05769 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -54,6 +54,13 @@ config AD7124
To compile this driver as a module, choose M here: the module will be
called ad7124.
+config AD717X
+ tristate "Analog Devices AD717x driver"
+ depends on SPI_MASTER
+ select AD_SIGMA_DELTA
+ help
+ Say yes here to build support for Analog Devices AD717x ADC.
+
config AD7192
tristate "Analog Devices AD7190 AD7192 AD7193 AD7195 ADC driver"
depends on SPI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index eb6e891790fb..e9491e4eff8d 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
obj-$(CONFIG_AD4130) += ad4130.o
obj-$(CONFIG_AD7091R5) += ad7091r5.o ad7091r-base.o
obj-$(CONFIG_AD7124) += ad7124.o
+obj-$(CONFIG_AD717X) += ad717x.o
obj-$(CONFIG_AD7192) += ad7192.o
obj-$(CONFIG_AD7266) += ad7266.o
obj-$(CONFIG_AD7280) += ad7280a.o
diff --git a/drivers/iio/adc/ad717x.c b/drivers/iio/adc/ad717x.c
new file mode 100644
index 000000000000..d14a3e0e2d93
--- /dev/null
+++ b/drivers/iio/adc/ad717x.c
@@ -0,0 +1,999 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AD7172-2/AD7173-8/AD7175-2/AD7176-2 SPI ADC driver
+ * Copyright (C) 2023 Analog Devices, Inc.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/sysfs.h>
+#include <linux/units.h>
+#include <linux/gpio/driver.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.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/iio/adc/ad_sigma_delta.h>
+
+#define AD717X_REG_COMMS 0x00
+#define AD717X_REG_ADC_MODE 0x01
+#define AD717X_REG_INTERFACE_MODE 0x02
+#define AD717X_REG_CRC 0x03
+#define AD717X_REG_DATA 0x04
+#define AD717X_REG_GPIO 0x06
+#define AD717X_REG_ID 0x07
+#define AD717X_REG_CH(x) (0x10 + (x))
+#define AD717X_REG_SETUP(x) (0x20 + (x))
+#define AD717X_REG_FILTER(x) (0x28 + (x))
+#define AD717X_REG_OFFSET(x) (0x30 + (x))
+#define AD717X_REG_GAIN(x) (0x38 + (x))
+
+#define AD717X_CH_ENABLE BIT(15)
+#define AD717X_CH_SETUP_SEL(x) ((x) << 12)
+#define AD717X_CH_SETUP_AINPOS(x) ((x) << 5)
+#define AD717X_CH_SETUP_AINNEG(x) (x)
+
+#define AD717X_CH_ADDRESS(pos, neg) \
+ (AD717X_CH_SETUP_AINPOS(pos) | AD717X_CH_SETUP_AINNEG(neg))
+
+#define AD7172_ID 0x00d0
+#define AD7173_ID 0x30d0
+#define AD7175_ID 0x0cd0
+#define AD7176_ID 0x0c90
+#define AD717X_ID_MASK 0xfff0
+
+#define AD717X_ADC_MODE_REF_EN BIT(15)
+#define AD717X_ADC_MODE_SING_CYC BIT(13)
+#define AD717X_ADC_MODE_MODE_MASK 0x70
+#define AD717X_ADC_MODE_MODE(x) ((x) << 4)
+#define AD717X_ADC_MODE_CLOCKSEL_MASK 0xc
+#define AD717X_ADC_MODE_CLOCKSEL(x) ((x) << 2)
+
+#define AD717X_GPIO_PDSW BIT(14)
+#define AD717X_GPIO_OP_EN2_3 BIT(13)
+#define AD717X_GPIO_MUX_IO BIT(12)
+#define AD717X_GPIO_SYNC_EN BIT(11)
+#define AD717X_GPIO_ERR_EN BIT(10)
+#define AD717X_GPIO_ERR_DAT BIT(9)
+#define AD717X_GPIO_GP_DATA3 BIT(7)
+#define AD717X_GPIO_GP_DATA2 BIT(6)
+#define AD717X_GPIO_IP_EN1 BIT(5)
+#define AD717X_GPIO_IP_EN0 BIT(4)
+#define AD717X_GPIO_OP_EN1 BIT(3)
+#define AD717X_GPIO_OP_EN0 BIT(2)
+#define AD717X_GPIO_GP_DATA1 BIT(1)
+#define AD717X_GPIO_GP_DATA0 BIT(0)
+
+#define AD717X_INTERFACE_DATA_STAT BIT(6)
+#define AD717X_INTERFACE_DATA_STAT_EN(x)\
+ FIELD_PREP(AD717X_INTERFACE_DATA_STAT, x)
+
+#define AD717X_SETUP_BIPOLAR BIT(12)
+#define AD717X_SETUP_AREF_BUF (0x3 << 10)
+#define AD717X_SETUP_AIN_BUF (0x3 << 8)
+#define AD717X_SETUP_REF_SEL_MASK 0x30
+#define AD717X_SETUP_REF_SEL_AVDD1_AVSS 0x30
+#define AD717X_SETUP_REF_SEL_INT_REF 0x20
+#define AD717X_SETUP_REF_SEL_EXT_REF2 0x10
+#define AD717X_SETUP_REF_SEL_EXT_REF 0x00
+
+#define AD717X_FILTER_ODR0_MASK 0x1f
+#define AD717X_MAX_CONFIGS 8
+
+enum ad717x_ids {
+ ID_AD7172_2,
+ ID_AD7173_8,
+ ID_AD7175_2,
+ ID_AD7176_2,
+};
+
+struct ad717x_device_info {
+ unsigned int id;
+ unsigned int num_inputs;
+ unsigned int num_channels;
+ unsigned int num_configs;
+ bool has_gp23;
+ bool has_temp;
+ unsigned int clock;
+
+ const unsigned int *sinc5_data_rates;
+ unsigned int num_sinc5_data_rates;
+};
+
+struct ad717x_channel_config {
+ bool live;
+ unsigned char cfg_slot;
+ /* Fields from this point are used to compare equality of configs */
+ unsigned char odr;
+ bool bipolar;
+ bool input_buf;
+};
+
+struct ad717x_channel {
+ unsigned int chan_reg;
+ struct ad717x_channel_config cfg;
+ unsigned int ain;
+};
+
+struct ad717x_state {
+ const struct ad717x_device_info *info;
+ struct ad_sigma_delta sd;
+ struct ad717x_channel *channels;
+ struct regulator *reg;
+ unsigned int adc_mode;
+ unsigned int interface_mode;
+ unsigned int num_channels;
+ struct mutex cfgs_lock; /* lock for configs access */
+ unsigned long cfg_slots_status; /* slots usage status bitmap*/
+ unsigned long long config_usage_counter;
+ unsigned long long *config_cnts;
+
+#ifdef CONFIG_GPIOLIB
+ struct gpio_chip gpiochip;
+ unsigned int gpio_reg;
+ unsigned int gpio_23_mask;
+#endif
+};
+
+static const unsigned int ad7173_sinc5_data_rates[] = {
+ 6211000, 6211000, 6211000, 6211000, 6211000, 6211000, 5181000, 4444000,
+ 3115000, 2597000, 1007000, 503800, 381000, 200300, 100500, 59520,
+ 49680, 20010, 16333, 10000, 5000, 2500, 1250,
+};
+
+static const unsigned int ad7175_sinc5_data_rates[] = {
+ 50000000, 41667000, 31250000, 27778000, 20833000, 17857000, 12500000,
+ 10000000, 5000000, 2500000, 1000000, 500000, 397500, 200000,
+ 100000, 59920, 49960, 20000, 16666, 10000, 5000,
+};
+
+static const struct ad717x_device_info ad717x_device_info[] = {
+ [ID_AD7172_2] = {
+ .id = AD7172_ID,
+ .num_inputs = 5,
+ .num_channels = 4,
+ .num_configs = 4,
+ .has_gp23 = false,
+ .has_temp = true,
+ .clock = 2000000,
+ .sinc5_data_rates = ad7173_sinc5_data_rates,
+ .num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
+ },
+ [ID_AD7173_8] = {
+ .id = AD7173_ID,
+ .num_inputs = 17,
+ .num_channels = 16,
+ .num_configs = 8,
+ .has_gp23 = true,
+ .has_temp = true,
+ .clock = 2000000,
+ .sinc5_data_rates = ad7173_sinc5_data_rates,
+ .num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
+ },
+ [ID_AD7175_2] = {
+ .id = AD7175_ID,
+ .num_inputs = 5,
+ .num_channels = 4,
+ .num_configs = 4,
+ .has_gp23 = false,
+ .has_temp = true,
+ .clock = 16000000,
+ .sinc5_data_rates = ad7175_sinc5_data_rates,
+ .num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
+ },
+ [ID_AD7176_2] = {
+ .id = AD7176_ID,
+ .num_inputs = 5,
+ .num_channels = 4,
+ .num_configs = 4,
+ .has_gp23 = false,
+ .has_temp = false,
+ .clock = 16000000,
+ .sinc5_data_rates = ad7175_sinc5_data_rates,
+ .num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
+ },
+};
+
+#ifdef CONFIG_GPIOLIB
+
+static struct ad717x_state *gpiochip_to_ad717x(struct gpio_chip *chip)
+{
+ return container_of(chip, struct ad717x_state, gpiochip);
+}
+
+static int ad717x_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct ad717x_state *st = gpiochip_to_ad717x(chip);
+ unsigned int mask;
+ unsigned int value;
+ int ret;
+
+ switch (offset) {
+ case 0:
+ mask = AD717X_GPIO_GP_DATA0;
+ break;
+ case 1:
+ mask = AD717X_GPIO_GP_DATA1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = ad_sd_read_reg(&st->sd, AD717X_REG_GPIO, 2, &value);
+ if (ret)
+ return ret;
+
+ return (bool)(value & mask);
+}
+
+static int ad717x_gpio_update(struct ad717x_state *st, unsigned int set_mask,
+ unsigned int clr_mask)
+{
+ st->gpio_reg |= set_mask;
+ st->gpio_reg &= ~clr_mask;
+
+ return ad_sd_write_reg(&st->sd, AD717X_REG_GPIO, 2, st->gpio_reg);
+}
+
+static void ad717x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct ad717x_state *st = gpiochip_to_ad717x(chip);
+ unsigned int mask, set_mask, clr_mask;
+
+ switch (offset) {
+ case 0:
+ mask = AD717X_GPIO_GP_DATA0;
+ break;
+ case 1:
+ mask = AD717X_GPIO_GP_DATA1;
+ break;
+ case 2:
+ mask = AD717X_GPIO_GP_DATA2;
+ break;
+ case 3:
+ mask = AD717X_GPIO_GP_DATA3;
+ break;
+ default:
+ return;
+ }
+
+ if (value) {
+ set_mask = mask;
+ clr_mask = 0;
+ } else {
+ set_mask = 0;
+ clr_mask = mask;
+ }
+
+ ad717x_gpio_update(st, set_mask, clr_mask);
+}
+
+static int ad717x_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct ad717x_state *st = gpiochip_to_ad717x(chip);
+ unsigned int mask;
+
+ switch (offset) {
+ case 0:
+ mask = AD717X_GPIO_IP_EN0;
+ break;
+ case 1:
+ mask = AD717X_GPIO_IP_EN1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ad717x_gpio_update(st, mask, 0);
+}
+
+static int ad717x_gpio_direction_output
+ (struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct ad717x_state *st = gpiochip_to_ad717x(chip);
+ unsigned int set_mask, clr_mask, val_mask;
+
+ switch (offset) {
+ case 0:
+ set_mask = AD717X_GPIO_OP_EN0;
+ val_mask = AD717X_GPIO_GP_DATA0;
+ break;
+ case 1:
+ set_mask = AD717X_GPIO_OP_EN1;
+ val_mask = AD717X_GPIO_GP_DATA1;
+ break;
+ /* GP2 and GP3 can not be enabled independently */
+ case 2:
+ st->gpio_23_mask |= (1 << 2);
+ set_mask = AD717X_GPIO_OP_EN2_3;
+ val_mask = AD717X_GPIO_GP_DATA2;
+ break;
+ case 3:
+ st->gpio_23_mask |= (1 << 3);
+ set_mask = AD717X_GPIO_OP_EN2_3;
+ val_mask = AD717X_GPIO_GP_DATA3;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (value) {
+ set_mask |= val_mask;
+ clr_mask = 0;
+ } else {
+ clr_mask = val_mask;
+ }
+
+ return ad717x_gpio_update(st, set_mask, clr_mask);
+}
+
+static void ad717x_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ struct ad717x_state *st = gpiochip_to_ad717x(chip);
+ unsigned int mask;
+
+ switch (offset) {
+ case 0:
+ mask = AD717X_GPIO_OP_EN0 | AD717X_GPIO_IP_EN0;
+ break;
+ case 1:
+ mask = AD717X_GPIO_OP_EN1 | AD717X_GPIO_IP_EN1;
+ break;
+ case 2:
+ st->gpio_23_mask &= ~(1 << offset);
+ if (st->gpio_23_mask != 0)
+ return;
+ mask = AD717X_GPIO_OP_EN2_3;
+ break;
+ default:
+ return;
+ }
+
+ ad717x_gpio_update(st, 0, mask);
+}
+
+static int ad717x_gpio_init(struct ad717x_state *st)
+{
+ st->gpiochip.label = dev_name(&st->sd.spi->dev);
+ st->gpiochip.base = -1;
+ if (st->info->has_gp23)
+ st->gpiochip.ngpio = 4;
+ else
+ st->gpiochip.ngpio = 2;
+ st->gpiochip.parent = &st->sd.spi->dev;
+ st->gpiochip.can_sleep = true;
+ st->gpiochip.direction_input = ad717x_gpio_direction_input;
+ st->gpiochip.direction_output = ad717x_gpio_direction_output;
+ st->gpiochip.get = ad717x_gpio_get;
+ st->gpiochip.set = ad717x_gpio_set;
+ st->gpiochip.free = ad717x_gpio_free;
+ st->gpiochip.owner = THIS_MODULE;
+
+ return devm_gpiochip_add_data(&st->sd.spi->dev, &st->gpiochip, NULL);
+}
+
+#else
+
+static int ad717x_gpio_init(struct ad717x_state *st) { return 0 };
+static void ad717x_gpio_cleanup(struct ad717x_state *st) {};
+
+#endif
+
+static struct ad717x_state *ad_sigma_delta_to_ad717x(struct ad_sigma_delta *sd)
+{
+ return container_of(sd, struct ad717x_state, sd);
+}
+
+static void ad717x_reset_usage_cnts(struct ad717x_state *st)
+{
+ int i;
+
+ for (i = 0; i < st->info->num_configs; i++)
+ (st->config_cnts)[i] = 0;
+
+ st->config_usage_counter = 0;
+}
+
+static struct ad717x_channel_config *ad717x_find_live_config
+ (struct ad717x_state *st, struct ad717x_channel_config *cfg)
+{
+ struct ad717x_channel_config *cfg_aux;
+ ptrdiff_t cmp_size, offset;
+ int i;
+
+ offset = offsetof(struct ad717x_channel_config, cfg_slot) +
+ sizeof(cfg->cfg_slot);
+ cmp_size = sizeof(*cfg) - offset;
+
+ for (i = 0; i < st->num_channels; i++) {
+ cfg_aux = &st->channels[i].cfg;
+
+ if (cfg_aux->live && !memcmp(((void *)cfg) + offset,
+ ((void *)cfg_aux) + offset, cmp_size))
+ return cfg_aux;
+ }
+ return NULL;
+}
+
+static int ad717x_free_config_slot_lru(struct ad717x_state *st)
+{
+ int i, lru_position = 0;
+
+ for (i = 1; i < st->info->num_configs; i++)
+ if (st->config_cnts[i] < st->config_cnts[lru_position])
+ lru_position = i;
+
+ for (i = 0; i < st->num_channels; i++)
+ if (st->channels[i].cfg.cfg_slot == lru_position)
+ st->channels[i].cfg.live = false;
+
+ assign_bit(lru_position, &st->cfg_slots_status, 0);
+ return lru_position;
+}
+
+static int ad717x_load_config(struct ad717x_state *st,
+ struct ad717x_channel_config *cfg)
+{
+ unsigned int config;
+ int free_cfg_slot, ret;
+
+ free_cfg_slot = find_first_zero_bit(&st->cfg_slots_status,
+ st->info->num_configs);
+ if (free_cfg_slot == st->info->num_configs)
+ free_cfg_slot = ad717x_free_config_slot_lru(st);
+
+ assign_bit(free_cfg_slot, &st->cfg_slots_status, 1);
+ cfg->cfg_slot = free_cfg_slot;
+
+ config = AD717X_SETUP_REF_SEL_INT_REF;
+
+ if (cfg->bipolar)
+ config |= AD717X_SETUP_BIPOLAR;
+
+ if (cfg->input_buf)
+ config |= AD717X_SETUP_AIN_BUF;
+
+ ret = ad_sd_write_reg(&st->sd, AD717X_REG_SETUP(free_cfg_slot), 2, config);
+ if (ret)
+ return ret;
+
+ config = AD717X_FILTER_ODR0_MASK & cfg->odr;
+ return ad_sd_write_reg(&st->sd, AD717X_REG_FILTER(free_cfg_slot), 2, config);
+}
+
+static int ad717x_config_channel(struct ad717x_state *st, int addr)
+{
+ struct ad717x_channel_config *cfg = &st->channels[addr].cfg;
+ struct ad717x_channel_config *live_cfg;
+ int ret = 0;
+
+ if (!cfg->live) {
+ live_cfg = ad717x_find_live_config(st, cfg);
+ if (!live_cfg) {
+ ret = ad717x_load_config(st, cfg);
+ if (ret < 0)
+ return ret;
+ } else {
+ cfg->cfg_slot = live_cfg->cfg_slot;
+ }
+ }
+
+ cfg->live = true;
+ if (st->config_usage_counter == U64_MAX)
+ ad717x_reset_usage_cnts(st);
+
+ st->config_usage_counter++;
+ st->config_cnts[cfg->cfg_slot] = st->config_usage_counter;
+
+ return 0;
+}
+
+static int ad717x_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
+{
+ struct ad717x_state *st = ad_sigma_delta_to_ad717x(sd);
+ unsigned int val;
+ int ret;
+
+ ret = ad717x_config_channel(st, channel);
+ if (ret < 0)
+ return ret;
+
+ val = AD717X_CH_ENABLE |
+ AD717X_CH_SETUP_SEL(st->channels[channel].cfg.cfg_slot) |
+ st->channels[channel].ain;
+
+ return ad_sd_write_reg(&st->sd, AD717X_REG_CH(channel), 2, val);
+}
+
+static int ad717x_set_mode(struct ad_sigma_delta *sd,
+ enum ad_sigma_delta_mode mode)
+{
+ struct ad717x_state *st = ad_sigma_delta_to_ad717x(sd);
+
+ st->adc_mode &= ~AD717X_ADC_MODE_MODE_MASK;
+ st->adc_mode |= AD717X_ADC_MODE_MODE(mode);
+
+ return ad_sd_write_reg(&st->sd, AD717X_REG_ADC_MODE, 2, st->adc_mode);
+}
+
+static int ad717x_append_status(struct ad_sigma_delta *sd, bool append)
+{
+ struct ad717x_state *st = container_of(sd, struct ad717x_state, sd);
+ unsigned int interface_mode = st->interface_mode;
+ int ret;
+
+ interface_mode |= AD717X_INTERFACE_DATA_STAT_EN(append);
+ ret = ad_sd_write_reg(&st->sd, AD717X_REG_INTERFACE_MODE, 2, interface_mode);
+ if (ret < 0)
+ return ret;
+
+ st->interface_mode = interface_mode;
+
+ return 0;
+}
+
+static int ad717x_disable_all(struct ad_sigma_delta *sd)
+{
+ struct ad717x_state *st = container_of(sd, struct ad717x_state, sd);
+ int ret;
+ int i;
+
+ for (i = 0; i < st->num_channels; i++) {
+ ret = ad_sd_write_reg(sd, AD717X_REG_CH(i), 2, 0);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct ad_sigma_delta_info ad717x_sigma_delta_info = {
+ .set_channel = ad717x_set_channel,
+ .append_status = ad717x_append_status,
+ .disable_all = ad717x_disable_all,
+ .set_mode = ad717x_set_mode,
+ .has_registers = true,
+ .addr_shift = 0,
+ .read_mask = BIT(6),
+ .status_ch_mask = GENMASK(3, 0),
+ .data_reg = AD717X_REG_DATA,
+ .irq_flags = IRQF_TRIGGER_FALLING
+};
+
+static int ad717x_setup(struct iio_dev *indio_dev)
+{
+ struct ad717x_state *st = iio_priv(indio_dev);
+ unsigned int id;
+ u8 *buf;
+ int ret;
+
+ /* reset the serial interface */
+ buf = kcalloc(8, sizeof(*buf), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ memset(buf, 0xff, 8);
+ ret = spi_write(st->sd.spi, buf, 8);
+ kfree(buf);
+ if (ret < 0)
+ return ret;
+
+ /* datasheet recommends a delay of at least 500us after reset */
+ usleep_range(500, 1000);
+
+ ret = ad_sd_read_reg(&st->sd, AD717X_REG_ID, 2, &id);
+ if (ret)
+ return ret;
+
+ id &= AD717X_ID_MASK;
+ if (id != st->info->id)
+ dev_warn(&st->sd.spi->dev, "Unexpected device id: %x, expected: %x\n",
+ id, st->info->id);
+
+ mutex_init(&st->cfgs_lock);
+ st->adc_mode |= AD717X_ADC_MODE_REF_EN | AD717X_ADC_MODE_SING_CYC;
+ st->interface_mode = 0x0;
+
+ st->config_usage_counter = 0;
+ st->config_cnts = devm_kzalloc(&indio_dev->dev,
+ st->info->num_configs * sizeof(u64),
+ GFP_KERNEL);
+ if (!st->config_cnts)
+ return -ENOMEM;
+
+ /* All channels are enabled by default after a reset */
+ ret = ad717x_disable_all(&st->sd);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int ad717x_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val, int *val2, long info)
+{
+ struct ad717x_state *st = iio_priv(indio_dev);
+ unsigned int reg;
+ int ret;
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ ret = ad_sigma_delta_single_conversion(indio_dev, chan, val);
+ if (ret < 0)
+ return ret;
+
+ /* disable channel after single conversion */
+ ret = ad_sd_write_reg(&st->sd, AD717X_REG_CH(chan->address), 2,
+ 0);
+ if (ret < 0)
+ return ret;
+
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ if (chan->type == IIO_TEMP) {
+ *val = 250000000;
+ *val2 = 800273203; /* (2**24 * 477) / 10 */
+ return IIO_VAL_FRACTIONAL;
+ } else {
+ *val = 2500;
+ if (chan->differential)
+ *val2 = 23;
+ else
+ *val2 = 24;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+ case IIO_CHAN_INFO_OFFSET:
+ if (chan->type == IIO_TEMP) {
+ *val = -874379;
+ } else {
+ if (chan->differential)
+ *val = -(1 << (chan->scan_type.realbits - 1));
+ else
+ *val = 0;
+ }
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ reg = st->channels[chan->address].cfg.odr;
+
+ *val = st->info->sinc5_data_rates[reg] / MILLI;
+ *val2 = (st->info->sinc5_data_rates[reg] % MILLI) * MILLI;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+ return -EINVAL;
+}
+
+static int ad717x_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val, int val2, long info)
+{
+ struct ad717x_state *st = iio_priv(indio_dev);
+ struct ad717x_channel_config *cfg;
+ unsigned int freq, i, reg;
+ int ret = 0;
+
+ mutex_lock(&st->cfgs_lock);
+ if (iio_buffer_enabled(indio_dev)) {
+ mutex_unlock(&st->cfgs_lock);
+ return -EBUSY;
+ }
+
+ switch (info) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ freq = val * MILLI + val2 / MILLI;
+
+ for (i = 0; i < st->info->num_sinc5_data_rates - 1; i++) {
+ if (freq >= st->info->sinc5_data_rates[i])
+ break;
+ }
+
+ cfg = &st->channels[chan->address].cfg;
+ cfg->odr = i;
+
+ if (cfg->live) {
+ ret = ad_sd_read_reg(&st->sd, AD717X_REG_FILTER(cfg->cfg_slot), 2, ®);
+ if (ret)
+ break;
+ reg &= ~AD717X_FILTER_ODR0_MASK;
+ reg |= i;
+ ret = ad_sd_write_reg(&st->sd, AD717X_REG_FILTER(cfg->cfg_slot), 2, reg);
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ mutex_unlock(&st->cfgs_lock);
+ return ret;
+}
+
+static int ad717x_write_raw_get_fmt(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, long mask)
+{
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int ad717x_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *scan_mask)
+{
+ struct ad717x_state *st = iio_priv(indio_dev);
+ bool bit_set;
+ int ret;
+ int i;
+
+ mutex_lock(&st->cfgs_lock);
+ for (i = 0; i < st->num_channels; i++) {
+ bit_set = test_bit(i, scan_mask);
+ if (bit_set)
+ ret = ad717x_set_channel(&st->sd, i);
+ else
+ ret = ad_sd_write_reg(&st->sd, AD717X_REG_CH(i), 2, 0);
+
+ if (ret < 0) {
+ mutex_unlock(&st->cfgs_lock);
+ return ret;
+ }
+ }
+
+ mutex_unlock(&st->cfgs_lock);
+
+ return 0;
+}
+
+static int ad717x_debug(struct iio_dev *indio_dev, unsigned int reg,
+ unsigned int writeval, unsigned int *readval)
+{
+ struct ad717x_state *st = iio_priv(indio_dev);
+ u8 reg_size = 2;
+
+ if (reg == 0)
+ reg_size = 1;
+ else if (reg == AD717X_REG_CRC || reg == AD717X_REG_DATA ||
+ reg >= AD717X_REG_OFFSET(0))
+ reg_size = 3;
+
+ if (readval)
+ return ad_sd_read_reg(&st->sd, reg, reg_size, readval);
+
+ return ad_sd_write_reg(&st->sd, reg, reg_size, writeval);
+}
+
+static const struct iio_info ad717x_info = {
+ .read_raw = &ad717x_read_raw,
+ .write_raw = &ad717x_write_raw,
+ .write_raw_get_fmt = &ad717x_write_raw_get_fmt,
+ .debugfs_reg_access = &ad717x_debug,
+ .validate_trigger = ad_sd_validate_trigger,
+ .update_scan_mode = ad717x_update_scan_mode,
+};
+
+static const struct iio_chan_spec ad717x_channel_template = {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 0,
+ .address = AD717X_CH_ADDRESS(0, 0),
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 24,
+ .storagebits = 32,
+ .shift = 0,
+ .endianness = IIO_BE,
+ },
+};
+
+static const struct iio_chan_spec ad717x_temp_iio_channel_template = {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .channel = 17,
+ .channel2 = 18,
+ .address = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 24,
+ .storagebits = 32,
+ .shift = 0,
+ .endianness = IIO_BE,
+ },
+};
+
+static int ad717x_of_parse_channel_config(struct iio_dev *indio_dev)
+{
+ struct ad717x_state *st = iio_priv(indio_dev);
+ struct ad717x_channel *channels_st_priv;
+ struct fwnode_handle *child;
+ struct device *dev = indio_dev->dev.parent;
+ struct iio_chan_spec *chan;
+ unsigned int num_channels = 0;
+ unsigned int ain[2], chan_index = 0;
+ bool use_temp = false;
+ int ret;
+
+ num_channels = device_get_child_node_count(dev);
+
+ if (device_property_read_bool(dev, "adi,temp-channel")) {
+ if (!st->info->has_temp) {
+ dev_err(indio_dev->dev.parent,
+ "Current chip does not support temperature channel");
+ return -EINVAL;
+ }
+
+ num_channels++;
+ use_temp = true;
+ }
+
+ st->num_channels = num_channels;
+
+ if (num_channels == 0)
+ return 0;
+
+ chan = devm_kcalloc(indio_dev->dev.parent, sizeof(*chan), num_channels,
+ GFP_KERNEL);
+ if (!chan)
+ return -ENOMEM;
+
+ channels_st_priv = devm_kcalloc(indio_dev->dev.parent, num_channels,
+ sizeof(*channels_st_priv), GFP_KERNEL);
+ if (!channels_st_priv)
+ return -ENOMEM;
+
+ indio_dev->channels = chan;
+ indio_dev->num_channels = num_channels;
+ st->channels = channels_st_priv;
+
+ if (use_temp) {
+ chan[chan_index] = ad717x_temp_iio_channel_template;
+ channels_st_priv[chan_index].ain =
+ AD717X_CH_ADDRESS(chan[chan_index].channel, chan[chan_index].channel2);
+ channels_st_priv[chan_index].cfg.bipolar = false;
+ channels_st_priv[chan_index].cfg.input_buf = true;
+ chan_index++;
+ }
+
+ device_for_each_child_node(dev, child) {
+ ret = fwnode_property_read_u32_array(child, "diff-channels", ain, 2);
+ if (ret) {
+ fwnode_handle_put(child);
+ return ret;
+ }
+
+ if (ain[0] >= st->info->num_inputs ||
+ ain[1] >= st->info->num_inputs) {
+ dev_err(indio_dev->dev.parent,
+ "Input pin number out of range for pair (%d %d).", ain[0], ain[1]);
+ fwnode_handle_put(child);
+ return -EINVAL;
+ }
+
+ chan[chan_index] = ad717x_channel_template;
+ chan[chan_index].address = chan_index;
+ chan[chan_index].scan_index = chan_index;
+ chan[chan_index].channel = ain[0];
+ chan[chan_index].channel2 = ain[1];
+
+ channels_st_priv[chan_index].ain =
+ AD717X_CH_ADDRESS(ain[0], ain[1]);
+ channels_st_priv[chan_index].chan_reg = chan_index;
+ channels_st_priv[chan_index].cfg.input_buf = true;
+ channels_st_priv[chan_index].cfg.odr = 0;
+
+ chan[chan_index].differential = fwnode_property_read_bool(child, "adi,bipolar");
+ if (chan[chan_index].differential) {
+ chan[chan_index].info_mask_separate |= BIT(IIO_CHAN_INFO_OFFSET);
+ channels_st_priv[chan_index].cfg.bipolar = true;
+ }
+
+ chan_index++;
+ }
+
+ return 0;
+}
+
+static int ad717x_probe(struct spi_device *spi)
+{
+ struct ad717x_state *st;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ if (!spi->irq) {
+ dev_err(&spi->dev, "No IRQ specified\n");
+ return -ENODEV;
+ }
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ st->info = device_get_match_data(&spi->dev);
+ if (!st->info)
+ return -ENODEV;
+
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->name = spi_get_device_id(spi)->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &ad717x_info;
+
+ ad717x_sigma_delta_info.num_slots = st->info->num_configs;
+ ret = ad_sd_init(&st->sd, indio_dev, spi, &ad717x_sigma_delta_info);
+ if (ret < 0)
+ return ret;
+
+ spi_set_drvdata(spi, indio_dev);
+
+ ret = ad717x_of_parse_channel_config(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev);
+ if (ret < 0)
+ return ret;
+
+ ret = ad717x_setup(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = devm_iio_device_register(&spi->dev, indio_dev);
+ if (ret)
+ return ret;
+
+ return ad717x_gpio_init(st);
+}
+
+static const struct of_device_id ad717x_of_match[] = {
+ { .compatible = "adi,ad7172-2",
+ .data = &ad717x_device_info[ID_AD7172_2] },
+ { .compatible = "adi,ad7173-8",
+ .data = &ad717x_device_info[ID_AD7173_8] },
+ { .compatible = "adi,ad7175-2",
+ .data = &ad717x_device_info[ID_AD7175_2] },
+ { .compatible = "adi,ad7176-2",
+ .data = &ad717x_device_info[ID_AD7176_2] },
+ {}
+}
+MODULE_DEVICE_TABLE(of, ad717x_of_match);
+
+static const struct spi_device_id ad717x_id_table[] = {
+ { "ad7172-2", },
+ { "ad7173-8", },
+ { "ad7175-2", },
+ { "ad7176-2", },
+ {}
+};
+MODULE_DEVICE_TABLE(spi, ad717x_id_table);
+
+static struct spi_driver ad717x_driver = {
+ .driver = {
+ .name = "ad717x",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ad717x_of_match),
+ },
+ .probe = ad717x_probe,
+ .id_table = ad717x_id_table,
+};
+module_spi_driver(ad717x_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@xxxxxxxxx>");
+MODULE_AUTHOR("Dumitru Ceclan <dumitru.ceclan@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Analog Devices AD7172/AD7173/AD7175/AD7176 ADC driver");
+MODULE_LICENSE("GPL v2");
--
2.30.2