[PATCH 4/4] iio: adc: add support for ad4052

Jorge Marques
2025-03-06T14:04:54Z

The AD4052/AD4058/AD4050/AD4056 are versatile, 16-bit/12-bit,
successive approximation register (SAR) analog-to-digital converter (ADC)
that enables low-power, high-density data acquisition solutions without
sacrificing precision.
This ADC offers a unique balance of performance and power efficiency,
plus innovative features for seamlessly switching between high-resolution
and low-power modes tailored to the immediate needs of the system.
The AD4052/AD4058/AD4050/AD4056 are ideal for battery-powered,
compact data acquisition and edge sensing applications.

Signed-off-by: Jorge Marques <jorge.marques@analog.com>
---
MAINTAINERS | 1 +
drivers/iio/adc/Kconfig | 14 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ad4052.c | 1289 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 1305 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 312b2cf94b8f06298b1cbe5975ee32e2cf9a74d8..275e2bace4731d37a3ef8eab173d11514e482e72 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1323,6 +1323,7 @@ S: Supported
W: https://ez.analog.com/linux-software-drivers
F: Documentation/devicetree/bindings/iio/adc/adi,ad4052.yaml
F: Documentation/iio/ad4052.rst
+F: drivers/iio/adc/ad4052.c

ANALOG DEVICES INC AD4130 DRIVER
M: Cosmin Tanislav <cosmin.tanislav@analog.com>
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 27413516216cb3f83cf1d995b9ffc22bf01776a4..f518dadbdd3a6b0543d0b78206fcbc203898454c 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -62,6 +62,20 @@ config AD4130
To compile this driver as a module, choose M here: the module will be
called ad4130.

+config AD4052
+ tristate "Analog Devices AD4052 Driver"
+ depends on SPI
+ select SPI_OFFLOAD
+ select IIO_BUFFER
+ select IIO_BUFFER_DMAENGINE
+ select REGMAP_SPI
+ help
+ Say yes here to build support for Analog Devices AD4052 SPI analog
+ to digital converters (ADC).
+
+ To compile this driver as a module, choose M here: the module will be
+ called ad4052.
+
config AD4695
tristate "Analog Device AD4695 ADC Driver"
depends on SPI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 9f26d5eca8225e28f308b3db437e25eb45b41a3c..412e35dfeb9be244c47e384d3abb67cef943a0f0 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_AD4000) += ad4000.o
obj-$(CONFIG_AD4030) += ad4030.o
obj-$(CONFIG_AD4130) += ad4130.o
+obj-$(CONFIG_AD4052) += ad4052.o
obj-$(CONFIG_AD4695) += ad4695.o
obj-$(CONFIG_AD4851) += ad4851.o
obj-$(CONFIG_AD7091R) += ad7091r-base.o
diff --git a/drivers/iio/adc/ad4052.c b/drivers/iio/adc/ad4052.c
new file mode 100644
index 0000000000000000000000000000000000000000..29452963fb15ab1b11e3a2fc59c34a2579f25910
--- /dev/null
+++ b/drivers/iio/adc/ad4052.c
@@ -0,0 +1,1289 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices AD4052 SPI ADC driver
+ *
+ * Copyright 2025 Analog Devices Inc.
+ */
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/buffer-dmaengine.h>
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/offload/consumer.h>
+
+#define AD4052_REG_INTERFACE_CONFIG_A 0x00
+#define AD4052_REG_DEVICE_CONFIG 0x02
+#define AD4052_REG_PROD_ID_1 0x05
+#define AD4052_REG_DEVICE_GRADE 0x06
+#define AD4052_REG_SCRATCH_PAD 0x0A
+#define AD4052_REG_VENDOR_H 0x0D
+#define AD4052_REG_STREAM_MODE 0x0E
+#define AD4052_REG_INTERFACE_STATUS 0x11
+#define AD4052_REG_MODE_SET 0x20
+#define AD4052_REG_ADC_MODES 0x21
+#define AD4052_REG_AVG_CONFIG 0x23
+#define AD4052_REG_GP_CONFIG 0x24
+#define AD4052_REG_INTR_CONFIG 0x25
+#define AD4052_REG_TIMER_CONFIG 0x27
+#define AD4052_REG_MAX_LIMIT 0x29
+#define AD4052_REG_MIN_LIMIT 0x2B
+#define AD4052_REG_MAX_HYST 0x2C
+#define AD4052_REG_MIN_HYST 0x2D
+#define AD4052_REG_MON_VAL 0x2F
+#define AD4052_REG_FUSE_CRC 0x40
+#define AD4052_REG_DEVICE_STATUS 0x41
+#define AD4052_REG_MIN_SAMPLE 0x45
+#define AD4052_MAX_REG 0x45
+/* GP_CONFIG */
+#define AD4052_GP_MODE_MSK(x) (GENMASK(2, 0) << (x) * 4)
+/* INTR_CONFIG */
+#define AD4052_INTR_EN_MSK(x) (GENMASK(1, 0) << (x) * 4)
+/* ADC_MODES */
+#define AD4052_DATA_FORMAT BIT(7)
+/* DEVICE_CONFIG */
+#define AD4052_POWER_MODE_MSK GENMASK(1, 0)
+#define AD4052_LOW_POWER_MODE 3
+/* DEVICE_STATUS */
+#define AD4052_DEVICE_RESET BIT(6)
+#define AD4052_THRESH_OVERRUN BIT(4)
+#define AD4052_MAX_FLAG BIT(3)
+#define AD4052_MIN_FLAG BIT(2)
+#define AD4052_EVENT_CLEAR (AD4052_THRESH_OVERRUN | AD4052_MAX_FLAG | AD4052_MIN_FLAG)
+/* TIMER_CONFIG */
+#define AD4052_FS_MASK GENMASK(7, 4)
+#define AD4052_300KSPS 0x2
+
+#define AD4052_SPI_VENDOR 0x0456
+
+#define AD4050_MAX_AVG 0x7
+#define AD4052_MAX_AVG 0xB
+#define AD4052_CHECK_OVERSAMPLING(x, y) ({typeof(y) y_ = (y); \
+ ((y_) < 0 || (y_) > BIT((x) + 1)); })
+#define AD4052_MAX_RATE(x) ((x) == AD4052_500KSPS ? 500000 : 2000000)
+#define AD4052_CHECK_RATE(x, y) ({typeof(y) y_ = (y); \
+ ((y_) > AD4052_MAX_RATE(x) || (y_) <= 0); })
+#define AD4052_FS_OFFSET(g) ((g) == AD4052_500KSPS ? 2 : 0)
+#define AD4052_FS(g) (&ad4052_sample_rates[AD4052_FS_OFFSET(g)])
+#define AD4052_FS_LEN(g) (ARRAY_SIZE(ad4052_sample_rates) - (AD4052_FS_OFFSET(g)))
+
+enum ad4052_grade {
+ AD4052_2MSPS,
+ AD4052_500KSPS,
+};
+
+enum ad4052_operation_mode {
+ AD4052_SAMPLE_MODE = 0,
+ AD4052_BURST_AVERAGING_MODE = 1,
+ AD4052_MONITOR_MODE = 3,
+};
+
+enum ad4052_gp_mode {
+ AD4052_GP_DISABLED,
+ AD4052_GP_INTR,
+ AD4052_GP_DRDY,
+};
+
+enum ad4052_interrupt_en {
+ AD4052_INTR_EN_NEITHER,
+ AD4052_INTR_EN_MIN,
+ AD4052_INTR_EN_MAX,
+ AD4052_INTR_EN_EITHER,
+};
+
+struct ad4052_chip_info {
+ const struct iio_chan_spec channels[1];
+ const struct iio_chan_spec offload_channels[1];
+ const char *name;
+ u16 prod_id;
+ u8 max_avg;
+ u8 grade;
+};
+
+enum {
+ AD4052_SCAN_TYPE_SAMPLE,
+ AD4052_SCAN_TYPE_BURST_AVG,
+ AD4052_SCAN_TYPE_OFFLOAD_SAMPLE,
+ AD4052_SCAN_TYPE_OFFLOAD_BURST_AVG,
+};
+
+static const struct iio_scan_type ad4052_scan_type_12_s[] = {
+ [AD4052_SCAN_TYPE_SAMPLE] = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_CPU,
+ },
+ [AD4052_SCAN_TYPE_BURST_AVG] = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_CPU,
+ },
+ [AD4052_SCAN_TYPE_OFFLOAD_SAMPLE] = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+ [AD4052_SCAN_TYPE_OFFLOAD_BURST_AVG] = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+};
+
+static const struct iio_scan_type ad4052_scan_type_16_s[] = {
+ [AD4052_SCAN_TYPE_SAMPLE] = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_CPU,
+ },
+ [AD4052_SCAN_TYPE_BURST_AVG] = {
+ .sign = 's',
+ .realbits = 24,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+ [AD4052_SCAN_TYPE_OFFLOAD_SAMPLE] = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+ [AD4052_SCAN_TYPE_OFFLOAD_BURST_AVG] = {
+ .sign = 's',
+ .realbits = 24,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+};
+
+struct ad4052_state {
+ const struct ad4052_bus_ops *ops;
+ const struct ad4052_chip_info *chip;
+ enum ad4052_operation_mode mode;
+ struct spi_offload *offload;
+ struct spi_offload_trigger *offload_trigger;
+ unsigned long offload_trigger_hz;
+ struct spi_device *spi;
+ struct spi_transfer offload_xfer;
+ struct spi_message offload_msg;
+ struct spi_transfer xfer;
+ struct spi_message msg;
+ struct gpio_desc *cnv_gp;
+ struct completion completion;
+ struct regmap *regmap;
+ bool wait_event;
+ int gp1_irq;
+ u8 data_format;
+ union {
+ __be16 d16;
+ __be32 d32;
+ } __aligned(IIO_DMA_MINALIGN);
+ u8 buf_reset_pattern[18];
+};
+
+static const struct regmap_range ad4052_regmap_rd_ranges[] = {
+ regmap_reg_range(AD4052_REG_INTERFACE_CONFIG_A, AD4052_REG_DEVICE_GRADE),
+ regmap_reg_range(AD4052_REG_SCRATCH_PAD, AD4052_REG_INTERFACE_STATUS),
+ regmap_reg_range(AD4052_REG_MODE_SET, AD4052_REG_MON_VAL),
+ regmap_reg_range(AD4052_REG_FUSE_CRC, AD4052_REG_MIN_SAMPLE),
+};
+
+static const struct regmap_access_table ad4052_regmap_rd_table = {
+ .yes_ranges = ad4052_regmap_rd_ranges,
+ .n_yes_ranges = ARRAY_SIZE(ad4052_regmap_rd_ranges),
+};
+
+static const struct regmap_range ad4052_regmap_wr_ranges[] = {
+ regmap_reg_range(AD4052_REG_INTERFACE_CONFIG_A, AD4052_REG_DEVICE_CONFIG),
+ regmap_reg_range(AD4052_REG_SCRATCH_PAD, AD4052_REG_SCRATCH_PAD),
+ regmap_reg_range(AD4052_REG_STREAM_MODE, AD4052_REG_INTERFACE_STATUS),
+ regmap_reg_range(AD4052_REG_MODE_SET, AD4052_REG_MON_VAL),
+ regmap_reg_range(AD4052_REG_FUSE_CRC, AD4052_REG_DEVICE_STATUS),
+};
+
+static const struct regmap_access_table ad4052_regmap_wr_table = {
+ .yes_ranges = ad4052_regmap_wr_ranges,
+ .n_yes_ranges = ARRAY_SIZE(ad4052_regmap_wr_ranges),
+};
+
+static const struct iio_event_spec ad4052_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_shared_by_all = BIT(IIO_EV_INFO_ENABLE)
+ },
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_shared_by_all = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_HYSTERESIS)
+ },
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_shared_by_all = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_HYSTERESIS)
+ }
+};
+
+static const int ad4052_sample_rate_avail[] = {
+ 2000000, 1000000, 300000, 100000, 33300,
+ 10000, 3000, 500, 333, 250, 200,
+ 166, 140, 125, 111
+};
+
+static const char *const ad4052_sample_rates[] = {
+ "2000000", "1000000", "300000", "100000", "33300",
+ "10000", "3000", "500", "333", "250", "200",
+ "166", "140", "124", "111",
+};
+
+static int ad4052_iio_device_claim_direct(struct iio_dev *indio_dev,
+ struct ad4052_state *st)
+{
+ if (!iio_device_claim_direct(indio_dev))
+ return false;
+
+ /**
+ * If the device is in monitor mode, no register access is allowed,
+ * since it would put the device back in configuration mode.
+ */
+ if (st->wait_event) {
+ iio_device_release_direct(indio_dev);
+ return false;
+ }
+ return true;
+}
+
+static int ad4052_sample_rate_get(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret, val;
+
+ if (!ad4052_iio_device_claim_direct(indio_dev, st))
+ return -EBUSY;
+
+ ret = regmap_read(st->regmap, AD4052_REG_TIMER_CONFIG, &val);
+ val = FIELD_GET(AD4052_FS_MASK, val);
+
+ iio_device_release_direct(indio_dev);
+ return ret ? ret : val - AD4052_FS_OFFSET(st->chip->grade);
+}
+
+static int ad4052_sample_rate_set(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int val)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if (!ad4052_iio_device_claim_direct(indio_dev, st))
+ return -EBUSY;
+
+ val += AD4052_FS_OFFSET(st->chip->grade);
+ val = FIELD_PREP(AD4052_FS_MASK, val);
+ ret = regmap_write(st->regmap, AD4052_REG_TIMER_CONFIG, val);
+
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static const struct iio_enum AD4052_500KSPS_sample_rate_enum = {
+ .items = AD4052_FS(AD4052_500KSPS),
+ .num_items = AD4052_FS_LEN(AD4052_500KSPS),
+ .set = ad4052_sample_rate_set,
+ .get = ad4052_sample_rate_get,
+};
+
+static const struct iio_enum AD4052_2MSPS_sample_rate_enum = {
+ .items = AD4052_FS(AD4052_2MSPS),
+ .num_items = AD4052_FS_LEN(AD4052_2MSPS),
+ .set = ad4052_sample_rate_set,
+ .get = ad4052_sample_rate_get,
+};
+
+#define AD4052_EXT_INFO(grade) \
+static struct iio_chan_spec_ext_info grade##_ext_info[] = { \
+ IIO_ENUM("sample_rate", IIO_SHARED_BY_ALL, &grade##_sample_rate_enum), \
+ IIO_ENUM_AVAILABLE("sample_rate", IIO_SHARED_BY_ALL, &grade##_sample_rate_enum),\
+ {} \
+}
+
+AD4052_EXT_INFO(AD4052_2MSPS);
+AD4052_EXT_INFO(AD4052_500KSPS);
+
+#define AD4052_CHAN(bits, grade) { \
+ .type = IIO_VOLTAGE, \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+ .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+ .indexed = 1, \
+ .channel = 0, \
+ .event_spec = ad4052_events, \
+ .num_event_specs = ARRAY_SIZE(ad4052_events), \
+ .has_ext_scan_type = 1, \
+ .ext_scan_type = ad4052_scan_type_##bits##_s, \
+ .num_ext_scan_type = ARRAY_SIZE(ad4052_scan_type_##bits##_s), \
+ .ext_info = grade##_ext_info, \
+}
+
+#define AD4052_OFFLOAD_CHAN(bits, grade) { \
+ .type = IIO_VOLTAGE, \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+ .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+ .indexed = 1, \
+ .channel = 0, \
+ .event_spec = ad4052_events, \
+ .num_event_specs = ARRAY_SIZE(ad4052_events), \
+ .has_ext_scan_type = 1, \
+ .ext_scan_type = ad4052_scan_type_##bits##_s, \
+ .num_ext_scan_type = ARRAY_SIZE(ad4052_scan_type_##bits##_s), \
+ .ext_info = grade##_ext_info, \
+}
+
+const struct ad4052_chip_info ad4050_chip_info = {
+ .name = "ad4050",
+ .channels = { AD4052_CHAN(12, AD4052_2MSPS) },
+ .offload_channels = { AD4052_OFFLOAD_CHAN(12, AD4052_2MSPS) },
+ .prod_id = 0x70,
+ .max_avg = AD4050_MAX_AVG,
+ .grade = AD4052_2MSPS,
+};
+
+const struct ad4052_chip_info ad4052_chip_info = {
+ .name = "ad4052",
+ .channels = { AD4052_CHAN(16, AD4052_2MSPS) },
+ .offload_channels = { AD4052_OFFLOAD_CHAN(16, AD4052_2MSPS) },
+ .prod_id = 0x72,
+ .max_avg = AD4052_MAX_AVG,
+ .grade = AD4052_2MSPS,
+};
+
+const struct ad4052_chip_info ad4056_chip_info = {
+ .name = "ad4056",
+ .channels = { AD4052_CHAN(12, AD4052_500KSPS) },
+ .offload_channels = { AD4052_OFFLOAD_CHAN(12, AD4052_500KSPS) },
+ .prod_id = 0x70,
+ .max_avg = AD4050_MAX_AVG,
+ .grade = AD4052_500KSPS,
+};
+
+const struct ad4052_chip_info ad4058_chip_info = {
+ .name = "ad4058",
+ .channels = { AD4052_CHAN(16, AD4052_500KSPS) },
+ .offload_channels = { AD4052_OFFLOAD_CHAN(16, AD4052_500KSPS) },
+ .prod_id = 0x72,
+ .max_avg = AD4052_MAX_AVG,
+ .grade = AD4052_500KSPS,
+};
+
+static void ad4052_update_xfer_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ const struct iio_scan_type *scan_type;
+ struct spi_transfer *xfer = &st->xfer;
+
+ scan_type = iio_get_current_scan_type(indio_dev, chan);
+
+ xfer->bits_per_word = scan_type->realbits;
+ xfer->len = BITS_TO_BYTES(scan_type->storagebits);
+}
+
+static int ad4052_update_xfer_offload(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ const struct iio_scan_type *scan_type;
+ struct spi_transfer *xfer = &st->xfer;
+
+ scan_type = iio_get_current_scan_type(indio_dev, chan);
+
+ xfer = &st->offload_xfer;
+ xfer->bits_per_word = scan_type->realbits;
+ xfer->len = BITS_TO_BYTES(scan_type->storagebits);
+
+ spi_message_init_with_transfers(&st->offload_msg, &st->offload_xfer, 1);
+ st->offload_msg.offload = st->offload;
+
+ return spi_optimize_message(st->spi, &st->offload_msg);
+}
+
+static int ad4052_set_oversampling_ratio(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int val)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if (AD4052_CHECK_OVERSAMPLING(st->chip->max_avg, val))
+ return -EINVAL;
+
+ /* 0 or 1 disables oversampling */
+ if (val == 0 || val == 1) {
+ st->mode = AD4052_SAMPLE_MODE;
+ } else {
+ val = ilog2(val);
+ st->mode = AD4052_BURST_AVERAGING_MODE;
+ ret = regmap_write(st->regmap, AD4052_REG_AVG_CONFIG, val - 1);
+ if (ret)
+ return ret;
+ }
+
+ ad4052_update_xfer_raw(indio_dev, chan);
+
+ return 0;
+}
+
+static int ad4052_get_oversampling_ratio(struct ad4052_state *st,
+ unsigned int *val)
+{
+ int ret;
+
+ if (st->mode == AD4052_SAMPLE_MODE) {
+ *val = 0;
+ return 0;
+ }
+
+ ret = regmap_read(st->regmap, AD4052_REG_AVG_CONFIG, val);
+ if (ret)
+ return ret;
+
+ *val = BIT(*val + 1);
+
+ return 0;
+}
+
+static int ad4052_assert(struct ad4052_state *st)
+{
+ int ret;
+ u16 val;
+
+ ret = regmap_bulk_read(st->regmap, AD4052_REG_PROD_ID_1, &st->d16, 2);
+ if (ret)
+ return ret;
+
+ val = be16_to_cpu(st->d16);
+ if (val != st->chip->prod_id)
+ return -ENODEV;
+
+ ret = regmap_bulk_read(st->regmap, AD4052_REG_VENDOR_H, &st->d16, 2);
+ if (ret)
+ return ret;
+
+ val = be16_to_cpu(st->d16);
+ if (val != AD4052_SPI_VENDOR)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int ad4052_exit_command(struct ad4052_state *st)
+{
+ struct spi_device *spi = st->spi;
+ const u8 val = 0xA8;
+
+ return spi_write(spi, &val, 1);
+}
+
+static int ad4052_set_operation_mode(struct ad4052_state *st, enum ad4052_operation_mode mode)
+{
+ u8 val = st->data_format | mode;
+ int ret;
+
+ ret = regmap_write(st->regmap, AD4052_REG_ADC_MODES, val);
+ if (ret)
+ return ret;
+
+ val = BIT(0);
+ return regmap_write(st->regmap, AD4052_REG_MODE_SET, val);
+}
+
+static int __ad4052_set_sampling_freq(struct ad4052_state *st, unsigned int freq)
+{
+ struct spi_offload_trigger_config config = {
+ .type = SPI_OFFLOAD_TRIGGER_PERIODIC,
+ .periodic = {
+ .frequency_hz = freq,
+ },
+ };
+ int ret;
+
+ ret = spi_offload_trigger_validate(st->offload_trigger, &config);
+ if (ret)
+ return ret;
+
+ st->offload_trigger_hz = config.periodic.frequency_hz;
+
+ return 0;
+}
+
+static int ad4052_soft_reset(struct ad4052_state *st)
+{
+ int ret;
+
+ memset(st->buf_reset_pattern, 0xFF, sizeof(st->buf_reset_pattern));
+ for (int i = 0; i < 3; i++)
+ st->buf_reset_pattern[6 * (i + 1) - 1] = 0xFE;
+
+ ret = spi_write(st->spi, st->buf_reset_pattern,
+ sizeof(st->buf_reset_pattern));
+ if (ret)
+ return ret;
+
+ /* Wait AD4052 reset delay */
+ fsleep(5000);
+
+ return 0;
+}
+
+static int ad4052_set_non_defaults(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ const struct iio_scan_type *scan_type;
+
+ scan_type = iio_get_current_scan_type(indio_dev, chan);
+
+ u8 val = FIELD_PREP(AD4052_GP_MODE_MSK(0), AD4052_GP_INTR) |
+ FIELD_PREP(AD4052_GP_MODE_MSK(1), AD4052_GP_DRDY);
+ int ret;
+
+ ret = regmap_update_bits(st->regmap, AD4052_REG_GP_CONFIG,
+ AD4052_GP_MODE_MSK(1) | AD4052_GP_MODE_MSK(0),
+ val);
+ if (ret)
+ return ret;
+
+ val = FIELD_PREP(AD4052_INTR_EN_MSK(0), (AD4052_INTR_EN_EITHER)) |
+ FIELD_PREP(AD4052_INTR_EN_MSK(1), (AD4052_INTR_EN_NEITHER));
+
+ ret = regmap_update_bits(st->regmap, AD4052_REG_INTR_CONFIG,
+ AD4052_INTR_EN_MSK(0) | AD4052_INTR_EN_MSK(1),
+ val);
+ if (ret)
+ return ret;
+
+ val = 0;
+ if (scan_type->sign == 's')
+ val |= AD4052_DATA_FORMAT;
+
+ st->data_format = val;
+
+ if (st->chip->grade == AD4052_500KSPS) {
+ ret = regmap_write(st->regmap, AD4052_REG_TIMER_CONFIG,
+ FIELD_PREP(AD4052_FS_MASK, AD4052_300KSPS));
+ if (ret)
+ return ret;
+ }
+
+ return regmap_write(st->regmap, AD4052_REG_ADC_MODES, val);
+}
+
+static irqreturn_t ad4052_irq_handler_thresh(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_EITHER),
+ iio_get_time_ns(indio_dev));
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ad4052_irq_handler_drdy(int irq, void *private)
+{
+ struct ad4052_state *st = private;
+
+ complete(&st->completion);
+
+ return IRQ_HANDLED;
+}
+
+static int ad4052_request_irq(struct iio_dev *indio_dev)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ struct device *dev = &st->spi->dev;
+ int ret = 0;
+
+ ret = fwnode_irq_get(dev_fwnode(&st->spi->dev), 0);
+ if (ret <= 0)
+ return ret ? ret : -EINVAL;
+
+ ret = devm_request_threaded_irq(dev,
+ ret, NULL, ad4052_irq_handler_thresh,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ indio_dev->name, indio_dev);
+ if (ret)
+ return ret;
+
+ ret = fwnode_irq_get(dev_fwnode(&st->spi->dev), 1);
+ if (ret <= 0)
+ return ret ? ret : -EINVAL;
+
+ st->gp1_irq = ret;
+ ret = devm_request_threaded_irq(dev,
+ ret, NULL, ad4052_irq_handler_drdy,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ indio_dev->name, st);
+ return ret;
+}
+
+static const int ad4052_oversampling_avail[] = {
+ 0, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096
+};
+
+static int ad4052_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, const int **vals,
+ int *type, int *len, long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ *vals = ad4052_oversampling_avail;
+ *len = ARRAY_SIZE(ad4052_oversampling_avail);
+ *type = IIO_VAL_INT;
+
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static ssize_t ad4052_set_sampling_freq(struct ad4052_state *st, unsigned int val)
+{
+ int ret;
+
+ if (AD4052_CHECK_RATE(st->chip->grade, val))
+ return -EINVAL;
+
+ ret = __ad4052_set_sampling_freq(st, val);
+
+ return ret;
+}
+
+static int __ad4052_read_chan_raw(struct ad4052_state *st, int *val)
+{
+ struct spi_device *spi = st->spi;
+ int ret;
+ struct spi_transfer t_cnv = {
+ .len = 0
+ };
+
+ reinit_completion(&st->completion);
+
+ if (st->cnv_gp) {
+ gpiod_set_value_cansleep(st->cnv_gp, 1);
+ gpiod_set_value_cansleep(st->cnv_gp, 0);
+ } else {
+ ret = spi_sync_transfer(spi, &t_cnv, 1);
+ if (ret)
+ return ret;
+ }
+ /*
+ * Single sample read should be used only for oversampling and
+ * sampling frequency pairs that take less than 1 sec.
+ */
+ ret = wait_for_completion_timeout(&st->completion,
+ msecs_to_jiffies(1000));
+ if (!ret)
+ return -ETIMEDOUT;
+
+ ret = spi_sync_transfer(spi, &st->xfer, 1);
+ if (ret)
+ return ret;
+
+ if (st->xfer.len == 2) {
+ *val = st->d16;
+ if (st->data_format & AD4052_DATA_FORMAT)
+ *val = sign_extend32(*val, 15);
+ } else {
+ *val = st->d32;
+ if (st->data_format & AD4052_DATA_FORMAT)
+ *val = sign_extend32(*val, 23);
+ }
+
+ return ret;
+}
+
+static int ad4052_read_chan_raw(struct iio_dev *indio_dev, int *val)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ ret = pm_runtime_resume_and_get(&st->spi->dev);
+ if (ret)
+ return ret;
+
+ ret = ad4052_set_operation_mode(st, st->mode);
+ if (ret)
+ goto out_error;
+
+ ret = __ad4052_read_chan_raw(st, val);
+ if (ret)
+ goto out_error;
+
+ ret = ad4052_exit_command(st);
+
+out_error:
+ pm_runtime_mark_last_busy(&st->spi->dev);
+ pm_runtime_put_autosuspend(&st->spi->dev);
+ return ret;
+}
+
+static int ad4052_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if (!ad4052_iio_device_claim_direct(indio_dev, st))
+ return -EBUSY;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = ad4052_read_chan_raw(indio_dev, val);
+ if (ret)
+ goto out_release;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ ret = ad4052_get_oversampling_ratio(st, val);
+ if (ret)
+ goto out_release;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *val = st->offload_trigger_hz;
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+out_release:
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static int ad4052_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long info)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if (!ad4052_iio_device_claim_direct(indio_dev, st))
+ return -EBUSY;
+
+ switch (info) {
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ ret = ad4052_set_oversampling_ratio(indio_dev, chan, val);
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = ad4052_set_sampling_freq(st, val);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static int ad4052_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret, state;
+
+ if (!ad4052_iio_device_claim_direct(indio_dev, st))
+ return -EBUSY;
+
+ ret = regmap_read(st->regmap, AD4052_REG_GP_CONFIG, &state);
+
+ iio_device_release_direct(indio_dev);
+ return ret ? ret : state & AD4052_GP_MODE_MSK(0);
+}
+
+static int ad4052_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ bool state)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret = -EBUSY;
+
+ if (!iio_device_claim_direct(indio_dev))
+ return -EBUSY;
+
+ if (st->wait_event == state)
+ goto out_release;
+
+ if (state) {
+ ret = pm_runtime_resume_and_get(&st->spi->dev);
+ if (ret)
+ goto out_release;
+
+ ret = ad4052_set_operation_mode(st, AD4052_MONITOR_MODE);
+ if (ret)
+ goto out_err_suspend;
+ } else {
+ pm_runtime_mark_last_busy(&st->spi->dev);
+ pm_runtime_put_autosuspend(&st->spi->dev);
+
+ ret = ad4052_exit_command(st);
+ }
+ st->wait_event = state;
+ iio_device_release_direct(indio_dev);
+ return ret;
+
+out_err_suspend:
+ pm_runtime_mark_last_busy(&st->spi->dev);
+ pm_runtime_put_autosuspend(&st->spi->dev);
+
+out_release:
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static int ad4052_read_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info, int *val,
+ int *val2)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ u8 reg, size = 1;
+ int ret;
+
+ if (!ad4052_iio_device_claim_direct(indio_dev, st))
+ return -EBUSY;
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ if (dir == IIO_EV_DIR_RISING)
+ reg = AD4052_REG_MAX_LIMIT;
+ else
+ reg = AD4052_REG_MIN_LIMIT;
+ size++;
+ break;
+ case IIO_EV_INFO_HYSTERESIS:
+ if (dir == IIO_EV_DIR_RISING)
+ reg = AD4052_REG_MAX_HYST;
+ else
+ reg = AD4052_REG_MIN_HYST;
+ break;
+ default:
+ iio_device_release_direct(indio_dev);
+ return -EINVAL;
+ }
+
+ ret = regmap_bulk_read(st->regmap, reg, &st->d32, size);
+ if (ret) {
+ iio_device_release_direct(indio_dev);
+ return ret;
+ }
+
+ if (reg == AD4052_REG_MAX_LIMIT || reg == AD4052_REG_MIN_LIMIT) {
+ *val = be16_to_cpu(st->d16);
+ if (st->data_format & AD4052_DATA_FORMAT)
+ *val = sign_extend32(*val, 11);
+ } else {
+ *val = st->d32;
+ }
+
+ iio_device_release_direct(indio_dev);
+ return IIO_VAL_INT;
+}
+
+static int ad4052_write_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info, int val,
+ int val2)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret = -EINVAL;
+ u8 reg, size = 1;
+
+ if (!ad4052_iio_device_claim_direct(indio_dev, st))
+ return -EBUSY;
+
+ st->d16 = cpu_to_be16(val);
+
+ switch (type) {
+ case IIO_EV_TYPE_THRESH:
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ if (st->data_format & AD4052_DATA_FORMAT) {
+ if (val > 2047 || val < -2048)
+ goto out_release;
+ } else if (val > 4095 || val < 0) {
+ goto out_release;
+ }
+ if (dir == IIO_EV_DIR_RISING)
+ reg = AD4052_REG_MAX_LIMIT;
+ else
+ reg = AD4052_REG_MIN_LIMIT;
+ size++;
+ break;
+ case IIO_EV_INFO_HYSTERESIS:
+ if (val & BIT(7))
+ goto out_release;
+ if (dir == IIO_EV_DIR_RISING)
+ reg = AD4052_REG_MAX_HYST;
+ else
+ reg = AD4052_REG_MIN_HYST;
+ st->d16 >>= 8;
+ break;
+ default:
+ goto out_release;
+ }
+ break;
+ default:
+ goto out_release;
+ }
+
+ ret = regmap_bulk_write(st->regmap, reg, &st->d16, size);
+
+out_release:
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static int ad4052_buffer_preenable(struct iio_dev *indio_dev)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ struct spi_offload_trigger_config config = {
+ .type = SPI_OFFLOAD_TRIGGER_PERIODIC,
+ .periodic = {
+ .frequency_hz = st->offload_trigger_hz,
+ },
+ };
+ int ret;
+
+ if (st->wait_event)
+ return -EBUSY;
+
+ ret = pm_runtime_resume_and_get(&st->spi->dev);
+ if (ret)
+ return ret;
+
+ ret = ad4052_set_operation_mode(st, st->mode);
+ if (ret)
+ goto out_error;
+
+ ret = ad4052_update_xfer_offload(indio_dev, indio_dev->channels);
+ if (ret)
+ goto out_error;
+
+ disable_irq(st->gp1_irq);
+
+ ret = spi_offload_trigger_enable(st->offload, st->offload_trigger,
+ &config);
+ if (ret)
+ goto out_offload_error;
+
+ return 0;
+
+out_offload_error:
+ enable_irq(st->gp1_irq);
+out_error:
+ pm_runtime_mark_last_busy(&st->spi->dev);
+ pm_runtime_put_autosuspend(&st->spi->dev);
+
+ return ret;
+}
+
+static int ad4052_buffer_postdisable(struct iio_dev *indio_dev)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ spi_offload_trigger_disable(st->offload, st->offload_trigger);
+ spi_unoptimize_message(&st->offload_msg);
+ enable_irq(st->gp1_irq);
+
+ ret = ad4052_exit_command(st);
+
+ pm_runtime_mark_last_busy(&st->spi->dev);
+ pm_runtime_put_autosuspend(&st->spi->dev);
+
+ return ret;
+}
+
+static const struct iio_buffer_setup_ops ad4052_buffer_setup_ops = {
+ .preenable = &ad4052_buffer_preenable,
+ .postdisable = &ad4052_buffer_postdisable,
+};
+
+static int ad4052_debugfs_reg_access(struct iio_dev *indio_dev, unsigned int reg,
+ unsigned int writeval, unsigned int *readval)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if (!ad4052_iio_device_claim_direct(indio_dev, st))
+ return -EBUSY;
+
+ if (readval)
+ ret = regmap_read(st->regmap, reg, readval);
+ else
+ ret = regmap_write(st->regmap, reg, writeval);
+
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static int ad4052_get_current_scan_type(const struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+
+ /*
+ * REVISIT: the supported offload has a fixed length of 32-bits
+ * to fit the 24-bits oversampled case, requiring the additional
+ * offload scan types.
+ */
+ if (iio_buffer_enabled(indio_dev))
+ return st->mode == AD4052_BURST_AVERAGING_MODE ?
+ AD4052_SCAN_TYPE_OFFLOAD_BURST_AVG :
+ AD4052_SCAN_TYPE_OFFLOAD_SAMPLE;
+
+ return st->mode == AD4052_BURST_AVERAGING_MODE ?
+ AD4052_SCAN_TYPE_BURST_AVG :
+ AD4052_SCAN_TYPE_SAMPLE;
+}
+
+static const struct iio_info ad4052_info = {
+ .read_raw = ad4052_read_raw,
+ .write_raw = ad4052_write_raw,
+ .read_avail = ad4052_read_avail,
+ .read_event_config = &ad4052_read_event_config,
+ .write_event_config = &ad4052_write_event_config,
+ .read_event_value = &ad4052_read_event_value,
+ .write_event_value = &ad4052_write_event_value,
+ .get_current_scan_type = &ad4052_get_current_scan_type,
+ .debugfs_reg_access = &ad4052_debugfs_reg_access,
+};
+
+static const struct regmap_config ad4052_regmap_config = {
+ .name = "ad4052",
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = AD4052_MAX_REG,
+ .read_flag_mask = BIT(7),
+ .can_sleep = true,
+};
+
+static const struct spi_offload_config ad4052_offload_config = {
+ .capability_flags = SPI_OFFLOAD_CAP_TRIGGER |
+ SPI_OFFLOAD_CAP_RX_STREAM_DMA,
+};
+
+static int ad4052_request_offload(struct iio_dev *indio_dev)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ struct device *dev = &st->spi->dev;
+ struct dma_chan *rx_dma;
+ int ret;
+
+ indio_dev->setup_ops = &ad4052_buffer_setup_ops;
+
+ st->offload_xfer.offload_flags = SPI_OFFLOAD_XFER_RX_STREAM;
+ st->offload_trigger = devm_spi_offload_trigger_get(dev,
+ st->offload,
+ SPI_OFFLOAD_TRIGGER_PERIODIC);
+
+ if (IS_ERR(st->offload_trigger))
+ return PTR_ERR(st->offload_trigger);
+
+ ret = __ad4052_set_sampling_freq(st, AD4052_MAX_RATE(st->chip->grade));
+ if (ret)
+ return ret;
+
+ rx_dma = devm_spi_offload_rx_stream_request_dma_chan(dev,
+ st->offload);
+ if (IS_ERR(rx_dma))
+ return PTR_ERR(rx_dma);
+
+ return devm_iio_dmaengine_buffer_setup_with_handle(dev, indio_dev, rx_dma,
+ IIO_BUFFER_DIRECTION_IN);
+}
+
+static int ad4052_probe(struct spi_device *spi)
+{
+ const struct ad4052_chip_info *chip;
+ struct device *dev = &spi->dev;
+ struct iio_dev *indio_dev;
+ struct ad4052_state *st;
+ int ret;
+ u8 buf;
+
+ chip = spi_get_device_match_data(spi);
+ if (!chip)
+ return dev_err_probe(dev, -ENODEV,
+ "Could not find chip info data\n");
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ st->spi = spi;
+ spi_set_drvdata(spi, st);
+ init_completion(&st->completion);
+
+ st->regmap = devm_regmap_init_spi(spi, &ad4052_regmap_config);
+ if (IS_ERR(st->regmap))
+ return dev_err_probe(&spi->dev, PTR_ERR(st->regmap),
+ "Failed to initialize regmap\n");
+
+ st->mode = AD4052_SAMPLE_MODE;
+ st->wait_event = false;
+ st->chip = chip;
+
+ st->cnv_gp = devm_gpiod_get_optional(dev, "cnv",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(st->cnv_gp))
+ return dev_err_probe(dev, PTR_ERR(st->cnv_gp),
+ "Failed to get cnv gpio\n");
+
+ indio_dev->modes = INDIO_BUFFER_HARDWARE | INDIO_DIRECT_MODE;
+ indio_dev->num_channels = 1;
+ indio_dev->info = &ad4052_info;
+ indio_dev->name = chip->name;
+
+ st->offload = devm_spi_offload_get(dev, spi, &ad4052_offload_config);
+ ret = PTR_ERR_OR_ZERO(st->offload);
+ if (ret && ret != -ENODEV)
+ return dev_err_probe(dev, ret, "Failed to get offload\n");
+
+ if (ret == -ENODEV) {
+ st->offload_trigger = NULL;
+ indio_dev->channels = chip->channels;
+ } else {
+ indio_dev->channels = chip->offload_channels;
+ ret = ad4052_request_offload(indio_dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to configure offload\n");
+ }
+
+ st->xfer.rx_buf = &st->d32;
+
+ ret = ad4052_soft_reset(st);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "AD4052 failed to soft reset\n");
+
+ ret = ad4052_assert(st);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "AD4052 fields assertions failed\n");
+
+ ret = ad4052_set_non_defaults(indio_dev, indio_dev->channels);
+ if (ret)
+ return ret;
+
+ buf = AD4052_DEVICE_RESET;
+ ret = regmap_write(st->regmap, AD4052_REG_DEVICE_STATUS, buf);
+ if (ret)
+ return ret;
+
+ ret = ad4052_request_irq(indio_dev);
+ if (ret)
+ return ret;
+
+ ad4052_update_xfer_raw(indio_dev, indio_dev->channels);
+
+ pm_runtime_set_autosuspend_delay(dev, 1000);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_active(dev);
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to enable pm_runtime\n");
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static int ad4052_runtime_suspend(struct device *dev)
+{
+ u8 val = FIELD_PREP(AD4052_POWER_MODE_MSK, AD4052_LOW_POWER_MODE);
+ struct ad4052_state *st = dev_get_drvdata(dev);
+
+ return regmap_write(st->regmap, AD4052_REG_DEVICE_CONFIG, val);
+}
+
+static int ad4052_runtime_resume(struct device *dev)
+{
+ struct ad4052_state *st = dev_get_drvdata(dev);
+ u8 val = FIELD_PREP(AD4052_POWER_MODE_MSK, 0);
+ int ret;
+
+ ret = regmap_write(st->regmap, AD4052_REG_DEVICE_CONFIG, val);
+ if (ret)
+ return ret;
+
+ fsleep(2000);
+ return 0;
+}
+
+static const struct dev_pm_ops ad4052_pm_ops = {
+ RUNTIME_PM_OPS(ad4052_runtime_suspend, ad4052_runtime_resume, NULL)
+};
+
+static const struct spi_device_id ad4052_id_table[] = {
+ {"ad4050", (kernel_ulong_t)&ad4050_chip_info },
+ {"ad4052", (kernel_ulong_t)&ad4052_chip_info },
+ {"ad4056", (kernel_ulong_t)&ad4056_chip_info },
+ {"ad4058", (kernel_ulong_t)&ad4058_chip_info },
+ {}
+};
+MODULE_DEVICE_TABLE(spi, ad4052_id_table);
+
+static const struct of_device_id ad4052_of_match[] = {
+ { .compatible = "adi,ad4050", .data = &ad4050_chip_info },
+ { .compatible = "adi,ad4052", .data = &ad4052_chip_info },
+ { .compatible = "adi,ad4056", .data = &ad4056_chip_info },
+ { .compatible = "adi,ad4058", .data = &ad4058_chip_info },
+ {}
+};
+MODULE_DEVICE_TABLE(of, ad4052_of_match);
+
+static struct spi_driver ad4052_driver = {
+ .driver = {
+ .name = "ad4052",
+ .of_match_table = ad4052_of_match,
+ .pm = pm_ptr(&ad4052_pm_ops),
+ },
+ .probe = ad4052_probe,
+ .id_table = ad4052_id_table,
+};
+module_spi_driver(ad4052_driver);
+
+MODULE_AUTHOR("Jorge Marques <jorge.marques@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD4052");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_DMAENGINE_BUFFER");

--
2.48.1