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Tue, 22 Apr 2025 07:35:20 -0400 From: Jorge Marques Date: Tue, 22 Apr 2025 13:34:50 +0200 Subject: [PATCH v2 5/5] iio: adc: add support for ad4052 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20250422-iio-driver-ad4052-v2-5-638af47e9eb3@analog.com> References: <20250422-iio-driver-ad4052-v2-0-638af47e9eb3@analog.com> In-Reply-To: <20250422-iio-driver-ad4052-v2-0-638af47e9eb3@analog.com> To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Corbet , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , "Andy Shevchenko" , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= CC: , , , , , Jorge Marques X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1745321704; l=42151; i=jorge.marques@analog.com; s=20250303; h=from:subject:message-id; bh=K7JLIEnlHd7CNNSx9ePnmyljb9yiC3gssm9WKJzSCHY=; 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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 --- MAINTAINERS | 1 + drivers/iio/adc/Kconfig | 14 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ad4052.c | 1425 ++++++++++++++++++++++++++++++++++++++++++= ++++ 4 files changed, 1441 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 04aa8db44bee418382a2e74cb6b1d03a810bd781..56adb540fa172d5729735acbeae= e6c576132cddd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1335,6 +1335,7 @@ 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 =20 ANALOG DEVICES INC AD4130 DRIVER M: Cosmin Tanislav diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index ad06cf5567851ee71f1211ec69d59fd5c1857ee5..68f8ce91320ea6db9377b344240= 8598a863ab428 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -55,6 +55,20 @@ config AD4030 To compile this driver as a module, choose M here: the module will be called ad4030. =20 +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 AD4130 tristate "Analog Device AD4130 ADC Driver" depends on SPI diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 07d4b832c42e6352f2a4c956295308f007af0f45..edc0d1809f0cf9fcd65ee2cf722= 18d0dc3ecacbf 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_AB8500_GPADC) +=3D ab8500-gpadc.o obj-$(CONFIG_AD_SIGMA_DELTA) +=3D ad_sigma_delta.o obj-$(CONFIG_AD4000) +=3D ad4000.o obj-$(CONFIG_AD4030) +=3D ad4030.o +obj-$(CONFIG_AD4052) +=3D ad4052.o obj-$(CONFIG_AD4130) +=3D ad4130.o obj-$(CONFIG_AD4695) +=3D ad4695.o obj-$(CONFIG_AD4851) +=3D ad4851.o diff --git a/drivers/iio/adc/ad4052.c b/drivers/iio/adc/ad4052.c new file mode 100644 index 0000000000000000000000000000000000000000..f412f0884bab4f500091f6c7ca7= 61967c8f6e3b6 --- /dev/null +++ b/drivers/iio/adc/ad4052.c @@ -0,0 +1,1425 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Analog Devices AD4052 SPI ADC driver + * + * Copyright 2025 Analog Devices Inc. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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_CONF 0x24 +#define AD4052_REG_INTR_CONF 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 +#define AD4052_ADC_MODES_MODE_MSK GENMASK(1, 0) +#define AD4052_GP_CONF_MODE_MSK_0 GENMASK(2, 0) +#define AD4052_GP_CONF_MODE_MSK_1 GENMASK(6, 4) +#define AD4052_INTR_CONF_EN_MSK_0 GENMASK(1, 0) +#define AD4052_INTR_CONF_EN_MSK_1 GENMASK(5, 4) +#define AD4052_MODE_SET_ENTER_ADC BIT(0) +#define AD4052_ADC_MODES_DATA_FORMAT BIT(7) +#define AD4052_DEVICE_CONFIG_POWER_MODE_MSK GENMASK(1, 0) +#define AD4052_DEVICE_CONFIG_LOW_POWER_MODE 3 +#define AD4052_DEVICE_STATUS_DEVICE_RESET BIT(6) +#define AD4052_TIMER_CONFIG_FS_MASK GENMASK(7, 4) +#define AD4052_TIMER_CONFIG_300KSPS 0x2 + +#define AD4052_SPI_VENDOR 0x0456 + +#define AD4050_MAX_AVG 0x7 +#define AD4052_MAX_AVG 0xB +#define AD4052_MAX_RATE(x) ((x) =3D=3D AD4052_500KSPS ? 500000 : 2000000) +#define AD4052_FS_OFFSET(g) ((g) =3D=3D AD4052_500KSPS ? 2 : 0) +#define AD4052_FS(g) ((&ad4052_conversion_freqs[AD4052_FS_OFFSET(g)])) +#define AD4052_FS_LEN(g) (ARRAY_SIZE(ad4052_conversion_freqs) - (AD4052_FS= _OFFSET(g))) +#define AD4052_T_CNVH_NS 10 + +enum ad4052_grade { + AD4052_2MSPS, + AD4052_500KSPS, +}; + +enum ad4052_operation_mode { + AD4052_SAMPLE_MODE =3D 0, + AD4052_BURST_AVERAGING_MODE =3D 1, + AD4052_MONITOR_MODE =3D 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; +}; + +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[] =3D { + [AD4052_SCAN_TYPE_SAMPLE] =3D { + .sign =3D 's', + .realbits =3D 16, + .storagebits =3D 16, + .endianness =3D IIO_CPU, + }, + [AD4052_SCAN_TYPE_BURST_AVG] =3D { + .sign =3D 's', + .realbits =3D 16, + .storagebits =3D 16, + .endianness =3D IIO_CPU, + }, + [AD4052_SCAN_TYPE_OFFLOAD_SAMPLE] =3D { + .sign =3D 's', + .realbits =3D 16, + .storagebits =3D 32, + .endianness =3D IIO_CPU, + }, + [AD4052_SCAN_TYPE_OFFLOAD_BURST_AVG] =3D { + .sign =3D 's', + .realbits =3D 16, + .storagebits =3D 32, + .endianness =3D IIO_CPU, + }, +}; + +static const struct iio_scan_type ad4052_scan_type_16_s[] =3D { + [AD4052_SCAN_TYPE_SAMPLE] =3D { + .sign =3D 's', + .realbits =3D 16, + .storagebits =3D 16, + .endianness =3D IIO_CPU, + }, + [AD4052_SCAN_TYPE_BURST_AVG] =3D { + .sign =3D 's', + .realbits =3D 24, + .storagebits =3D 32, + .endianness =3D IIO_CPU, + }, + [AD4052_SCAN_TYPE_OFFLOAD_SAMPLE] =3D { + .sign =3D 's', + .realbits =3D 16, + .storagebits =3D 32, + .endianness =3D IIO_CPU, + }, + [AD4052_SCAN_TYPE_OFFLOAD_BURST_AVG] =3D { + .sign =3D 's', + .realbits =3D 24, + .storagebits =3D 32, + .endianness =3D 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; + struct spi_device *spi; + struct spi_transfer offload_xfer; + struct spi_message offload_msg; + struct pwm_device *cnv_pwm; + struct spi_transfer xfer; + struct spi_message msg; + struct gpio_desc *cnv_gp; + struct completion completion; + struct regmap *regmap; + u16 oversampling_frequency; + u16 events_frequency; + bool wait_event; + int gp1_irq; + u8 data_format; + u8 grade; + union { + __be16 d16; + __be32 d32; + } __aligned(IIO_DMA_MINALIGN); + u8 buf_reset_pattern[18]; +}; + +static const struct regmap_range ad4052_regmap_rd_ranges[] =3D { + 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 =3D { + .yes_ranges =3D ad4052_regmap_rd_ranges, + .n_yes_ranges =3D ARRAY_SIZE(ad4052_regmap_rd_ranges), +}; + +static const struct regmap_range ad4052_regmap_wr_ranges[] =3D { + 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 =3D { + .yes_ranges =3D ad4052_regmap_wr_ranges, + .n_yes_ranges =3D ARRAY_SIZE(ad4052_regmap_wr_ranges), +}; + +static const struct iio_event_spec ad4052_events[] =3D { + { + .type =3D IIO_EV_TYPE_THRESH, + .dir =3D IIO_EV_DIR_EITHER, + .mask_shared_by_all =3D BIT(IIO_EV_INFO_ENABLE) + }, + { + .type =3D IIO_EV_TYPE_THRESH, + .dir =3D IIO_EV_DIR_RISING, + .mask_shared_by_all =3D BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_HYSTERESIS) + }, + { + .type =3D IIO_EV_TYPE_THRESH, + .dir =3D IIO_EV_DIR_FALLING, + .mask_shared_by_all =3D BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_HYSTERESIS) + } +}; + +static const char *const ad4052_conversion_freqs[] =3D { + "2000000", "1000000", "300000", "100000", "33300", + "10000", "3000", "500", "333", "250", "200", + "166", "140", "124", "111", +}; + +static int ad4052_conversion_frequency_set(struct ad4052_state *st, u8 val) +{ + val +=3D AD4052_FS_OFFSET(st->grade); + return regmap_write(st->regmap, AD4052_REG_TIMER_CONFIG, + FIELD_PREP(AD4052_TIMER_CONFIG_FS_MASK, val)); +} + +static int ad4052_oversampling_frequency_get(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + + return st->oversampling_frequency - AD4052_FS_OFFSET(st->grade); +} + +static int ad4052_oversampling_frequency_set(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + unsigned int val) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + if (st->wait_event) { + iio_device_release_direct(indio_dev); + return -EBUSY; + } + + val +=3D AD4052_FS_OFFSET(st->grade); + st->oversampling_frequency =3D val; + + iio_device_release_direct(indio_dev); + return 0; +} + +static ssize_t ad4052_events_frequency_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ad4052_state *st =3D iio_priv(dev_to_iio_dev(dev)); + + return sprintf(buf, "%s\n", ad4052_conversion_freqs[st->events_frequency]= ); +} + +static ssize_t ad4052_events_frequency_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev =3D dev_to_iio_dev(dev); + struct ad4052_state *st =3D iio_priv(indio_dev); + int ret; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + if (st->wait_event) { + iio_device_release_direct(indio_dev); + return -EBUSY; + } + + ret =3D __sysfs_match_string(AD4052_FS(st->grade), + AD4052_FS_LEN(st->grade), buf); + if (ret >=3D 0) + st->events_frequency =3D ret; + + iio_device_release_direct(indio_dev); + + return ret < 0 ? ret : len; +} + +static ssize_t ad4052_events_frequency_available_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ad4052_state *st =3D iio_priv(dev_to_iio_dev(dev)); + int len =3D 0; + + for (u8 i =3D AD4052_FS_OFFSET(st->grade); + i < AD4052_FS_LEN(st->grade); i++) + len +=3D sprintf(buf + len, "%s ", ad4052_conversion_freqs[i]); + + return sprintf(buf + len, "\n") + len; +} + +static IIO_DEVICE_ATTR(sampling_frequency, 0644, + ad4052_events_frequency_show, + ad4052_events_frequency_store, 0); + +static IIO_DEVICE_ATTR(sampling_frequency_available, 0444, + ad4052_events_frequency_available_show, + NULL, 0); + +static struct attribute *ad4052_event_attributes[] =3D { + &iio_dev_attr_sampling_frequency.dev_attr.attr, + &iio_dev_attr_sampling_frequency_available.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad4052_event_attribute_group =3D { + .attrs =3D ad4052_event_attributes, +}; + +static const struct iio_enum AD4052_500KSPS_conversion_freq_enum =3D { + .items =3D AD4052_FS(AD4052_500KSPS), + .num_items =3D AD4052_FS_LEN(AD4052_500KSPS), + .set =3D ad4052_oversampling_frequency_set, + .get =3D ad4052_oversampling_frequency_get, +}; + +static const struct iio_enum AD4052_2MSPS_conversion_freq_enum =3D { + .items =3D AD4052_FS(AD4052_2MSPS), + .num_items =3D AD4052_FS_LEN(AD4052_2MSPS), + .set =3D ad4052_oversampling_frequency_set, + .get =3D ad4052_oversampling_frequency_get, +}; + +#define AD4052_EXT_INFO(grade) \ +static struct iio_chan_spec_ext_info grade##_ext_info[] =3D { \ + IIO_ENUM("oversampling_frequency", IIO_SHARED_BY_ALL, \ + &grade##_conversion_freq_enum), \ + IIO_ENUM_AVAILABLE("oversampling_frequency", IIO_SHARED_BY_ALL, \ + &grade##_conversion_freq_enum), \ + { } \ +} + +AD4052_EXT_INFO(AD4052_2MSPS); +AD4052_EXT_INFO(AD4052_500KSPS); + +#define AD4052_CHAN(bits, grade) { \ + .type =3D IIO_VOLTAGE, \ + .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ + .info_mask_shared_by_type_available =3D BIT(IIO_CHAN_INFO_OVERSAMPLING_RA= TIO), \ + .indexed =3D 1, \ + .channel =3D 0, \ + .event_spec =3D ad4052_events, \ + .num_event_specs =3D ARRAY_SIZE(ad4052_events), \ + .has_ext_scan_type =3D 1, \ + .ext_scan_type =3D ad4052_scan_type_##bits##_s, \ + .num_ext_scan_type =3D ARRAY_SIZE(ad4052_scan_type_##bits##_s), \ + .ext_info =3D grade##_ext_info, \ +} + +#define AD4052_OFFLOAD_CHAN(bits, grade) { \ + .type =3D IIO_VOLTAGE, \ + .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .info_mask_shared_by_type_available =3D BIT(IIO_CHAN_INFO_OVERSAMPLING_RA= TIO), \ + .indexed =3D 1, \ + .channel =3D 0, \ + .event_spec =3D ad4052_events, \ + .num_event_specs =3D ARRAY_SIZE(ad4052_events), \ + .has_ext_scan_type =3D 1, \ + .ext_scan_type =3D ad4052_scan_type_##bits##_s, \ + .num_ext_scan_type =3D ARRAY_SIZE(ad4052_scan_type_##bits##_s), \ + .ext_info =3D grade##_ext_info, \ +} + +static const struct ad4052_chip_info ad4050_chip_info =3D { + .name =3D "ad4050", + .channels =3D { AD4052_CHAN(12, AD4052_2MSPS) }, + .offload_channels =3D { AD4052_OFFLOAD_CHAN(12, AD4052_2MSPS) }, + .prod_id =3D 0x70, + .max_avg =3D AD4050_MAX_AVG, +}; + +static const struct ad4052_chip_info ad4052_chip_info =3D { + .name =3D "ad4052", + .channels =3D { AD4052_CHAN(16, AD4052_2MSPS) }, + .offload_channels =3D { AD4052_OFFLOAD_CHAN(16, AD4052_2MSPS) }, + .prod_id =3D 0x72, + .max_avg =3D AD4052_MAX_AVG, +}; + +static const struct ad4052_chip_info ad4056_chip_info =3D { + .name =3D "ad4056", + .channels =3D { AD4052_CHAN(12, AD4052_500KSPS) }, + .offload_channels =3D { AD4052_OFFLOAD_CHAN(12, AD4052_500KSPS) }, + .prod_id =3D 0x76, + .max_avg =3D AD4050_MAX_AVG, +}; + +static const struct ad4052_chip_info ad4058_chip_info =3D { + .name =3D "ad4058", + .channels =3D { AD4052_CHAN(16, AD4052_500KSPS) }, + .offload_channels =3D { AD4052_OFFLOAD_CHAN(16, AD4052_500KSPS) }, + .prod_id =3D 0x78, + .max_avg =3D AD4052_MAX_AVG, +}; + +static void ad4052_update_xfer_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + const struct iio_scan_type *scan_type; + struct spi_transfer *xfer =3D &st->xfer; + + scan_type =3D iio_get_current_scan_type(indio_dev, chan); + + if (IS_ERR(scan_type)) + return; + + xfer->bits_per_word =3D scan_type->realbits; + xfer->len =3D 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 =3D iio_priv(indio_dev); + const struct iio_scan_type *scan_type; + struct spi_transfer *xfer =3D &st->xfer; + + scan_type =3D iio_get_current_scan_type(indio_dev, chan); + + if (IS_ERR(scan_type)) + return PTR_ERR(scan_type); + + xfer =3D &st->offload_xfer; + xfer->bits_per_word =3D scan_type->realbits; + xfer->len =3D BITS_TO_BYTES(scan_type->storagebits); + + spi_message_init_with_transfers(&st->offload_msg, &st->offload_xfer, 1); + st->offload_msg.offload =3D 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 =3D iio_priv(indio_dev); + int ret; + + if ((val) < 1 || (val) > BIT(st->chip->max_avg + 1)) + return -EINVAL; + + /* 1 disables oversampling */ + if (val =3D=3D 1) { + st->mode =3D AD4052_SAMPLE_MODE; + } else { + val =3D ilog2(val); + st->mode =3D AD4052_BURST_AVERAGING_MODE; + ret =3D 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 =3D=3D AD4052_SAMPLE_MODE) { + *val =3D 1; + return 0; + } + + ret =3D regmap_read(st->regmap, AD4052_REG_AVG_CONFIG, val); + if (ret) + return ret; + + *val =3D BIT(*val + 1); + + return 0; +} + +static int ad4052_check_ids(struct ad4052_state *st) +{ + int ret; + u16 val; + + ret =3D regmap_bulk_read(st->regmap, AD4052_REG_PROD_ID_1, &st->d16, + sizeof(st->d16)); + if (ret) + return ret; + + val =3D be16_to_cpu(st->d16); + if (val !=3D st->chip->prod_id) + dev_info(&st->spi->dev, + "Production ID x%x does not match known values", val); + + ret =3D regmap_bulk_read(st->regmap, AD4052_REG_VENDOR_H, &st->d16, + sizeof(st->d16)); + if (ret) + return ret; + + val =3D be16_to_cpu(st->d16); + if (val !=3D AD4052_SPI_VENDOR) + return -ENODEV; + + return 0; +} + +static int ad4052_exit_command(struct ad4052_state *st) +{ + struct spi_device *spi =3D st->spi; + const u8 val =3D 0xA8; + + return spi_write(spi, &val, 1); +} + +static int ad4052_set_operation_mode(struct ad4052_state *st, + enum ad4052_operation_mode mode) +{ + int ret; + + if (mode =3D=3D AD4052_BURST_AVERAGING_MODE) { + ret =3D ad4052_conversion_frequency_set(st, st->oversampling_frequency); + if (ret) + return ret; + } + + ret =3D regmap_update_bits(st->regmap, AD4052_REG_ADC_MODES, + AD4052_ADC_MODES_MODE_MSK, mode); + if (ret) + return ret; + + return regmap_write(st->regmap, AD4052_REG_MODE_SET, + AD4052_MODE_SET_ENTER_ADC); +} + +static int ad4052_set_sampling_freq(struct ad4052_state *st, unsigned int = freq) +{ + struct pwm_state pwm_st; + + if (freq <=3D 0 || freq > AD4052_MAX_RATE(st->grade)) + return -EINVAL; + + pwm_get_state(st->cnv_pwm, &pwm_st); + pwm_st.period =3D DIV_ROUND_UP_ULL(NSEC_PER_SEC, freq); + return pwm_apply_might_sleep(st->cnv_pwm, &pwm_st); +} + +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 =3D 0; i < 3; i++) + st->buf_reset_pattern[6 * (i + 1) - 1] =3D 0xFE; + + ret =3D 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_setup(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + const struct iio_scan_type *scan_type; + + scan_type =3D iio_get_current_scan_type(indio_dev, chan); + + if (IS_ERR(scan_type)) + return PTR_ERR(scan_type); + + u8 val =3D FIELD_PREP(AD4052_GP_CONF_MODE_MSK_0, AD4052_GP_INTR) | + FIELD_PREP(AD4052_GP_CONF_MODE_MSK_1, AD4052_GP_DRDY); + int ret; + + ret =3D regmap_update_bits(st->regmap, AD4052_REG_GP_CONF, + AD4052_GP_CONF_MODE_MSK_1 | AD4052_GP_CONF_MODE_MSK_0, + val); + if (ret) + return ret; + + val =3D FIELD_PREP(AD4052_INTR_CONF_EN_MSK_0, (AD4052_INTR_EN_EITHER)) | + FIELD_PREP(AD4052_INTR_CONF_EN_MSK_1, (AD4052_INTR_EN_NEITHER)); + + ret =3D regmap_update_bits(st->regmap, AD4052_REG_INTR_CONF, + AD4052_INTR_CONF_EN_MSK_0 | AD4052_INTR_CONF_EN_MSK_1, + val); + if (ret) + return ret; + + val =3D 0; + if (scan_type->sign =3D=3D 's') + val |=3D AD4052_ADC_MODES_DATA_FORMAT; + + st->data_format =3D val; + + if (st->grade =3D=3D AD4052_500KSPS) { + ret =3D regmap_write(st->regmap, AD4052_REG_TIMER_CONFIG, + FIELD_PREP(AD4052_TIMER_CONFIG_FS_MASK, + AD4052_TIMER_CONFIG_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 =3D 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 =3D private; + + complete(&st->completion); + + return IRQ_HANDLED; +} + +static int ad4052_request_irq(struct iio_dev *indio_dev) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + struct device *dev =3D &st->spi->dev; + int ret =3D 0; + + ret =3D fwnode_irq_get_byname(dev_fwnode(&st->spi->dev), "gp0"); + if (ret <=3D 0) + return ret ? ret : -EINVAL; + + ret =3D devm_request_threaded_irq(dev, ret, NULL, + ad4052_irq_handler_thresh, + IRQF_ONESHOT, indio_dev->name, + indio_dev); + if (ret) + return ret; + + ret =3D fwnode_irq_get_byname(dev_fwnode(&st->spi->dev), "gp1"); + if (ret <=3D 0) + return ret ? ret : -EINVAL; + + st->gp1_irq =3D ret; + return devm_request_threaded_irq(dev, ret, NULL, + ad4052_irq_handler_drdy, + IRQF_ONESHOT, indio_dev->name, + st); +} + +static const int ad4052_oversampling_avail[] =3D { + 1, 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 =3D ad4052_oversampling_avail; + *len =3D ARRAY_SIZE(ad4052_oversampling_avail); + *type =3D IIO_VAL_INT; + + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static int __ad4052_read_chan_raw(struct ad4052_state *st, int *val) +{ + struct spi_device *spi =3D st->spi; + int ret; + struct spi_transfer t_cnv =3D { + .len =3D 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 =3D 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 =3D wait_for_completion_timeout(&st->completion, + msecs_to_jiffies(1000)); + if (!ret) + return -ETIMEDOUT; + + ret =3D spi_sync_transfer(spi, &st->xfer, 1); + if (ret) + return ret; + + if (st->xfer.len =3D=3D 2) { + *val =3D be16_to_cpu(st->d16); + if (st->data_format & AD4052_ADC_MODES_DATA_FORMAT) + *val =3D sign_extend32(*val, 15); + } else { + *val =3D be32_to_cpu(st->d32); + if (st->data_format & AD4052_ADC_MODES_DATA_FORMAT) + *val =3D sign_extend32(*val, 23); + } + + return ret; +} + +static int ad4052_read_chan_raw(struct iio_dev *indio_dev, int *val) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + int ret; + + ret =3D pm_runtime_resume_and_get(&st->spi->dev); + if (ret) + return ret; + + ret =3D ad4052_set_operation_mode(st, st->mode); + if (ret) + goto out_error; + + ret =3D __ad4052_read_chan_raw(st, val); + if (ret) + goto out_error; + + ret =3D 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 =3D iio_priv(indio_dev); + struct pwm_state pwm_st; + int ret; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + if (st->wait_event) { + iio_device_release_direct(indio_dev); + return -EBUSY; + } + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret =3D ad4052_read_chan_raw(indio_dev, val); + if (ret) + goto out_release; + ret =3D IIO_VAL_INT; + break; + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + ret =3D ad4052_get_oversampling_ratio(st, val); + if (ret) + goto out_release; + ret =3D IIO_VAL_INT; + break; + case IIO_CHAN_INFO_SAMP_FREQ: + ret =3D pwm_get_state_hw(st->cnv_pwm, &pwm_st); + if (ret) + goto out_release; + + if (!pwm_st.enabled) + pwm_get_state(st->cnv_pwm, &pwm_st); + + *val =3D DIV_ROUND_UP_ULL(NSEC_PER_SEC, pwm_st.period); + + ret =3D IIO_VAL_INT; + break; + default: + ret =3D -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 =3D iio_priv(indio_dev); + int ret; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + if (st->wait_event) { + iio_device_release_direct(indio_dev); + return -EBUSY; + } + + switch (info) { + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + ret =3D ad4052_set_oversampling_ratio(indio_dev, chan, val); + break; + case IIO_CHAN_INFO_SAMP_FREQ: + ret =3D ad4052_set_sampling_freq(st, val); + break; + default: + ret =3D -EINVAL; + } + + iio_device_release_direct(indio_dev); + return ret; +} + +static int ad4052_monitor_mode_enable(struct ad4052_state *st) +{ + int ret; + + ret =3D pm_runtime_resume_and_get(&st->spi->dev); + if (ret) + return ret; + + ret =3D ad4052_conversion_frequency_set(st, st->events_frequency); + if (ret) + goto out_error; + + ret =3D ad4052_set_operation_mode(st, AD4052_MONITOR_MODE); + if (ret) + goto out_error; + + return ret; +out_error: + pm_runtime_mark_last_busy(&st->spi->dev); + pm_runtime_put_autosuspend(&st->spi->dev); + return ret; +} + +static int ad4052_monitor_mode_disable(struct ad4052_state *st) +{ + int ret; + + pm_runtime_mark_last_busy(&st->spi->dev); + pm_runtime_put_autosuspend(&st->spi->dev); + + ret =3D ad4052_exit_command(st); + + if (ret) + pm_runtime_resume_and_get(&st->spi->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 =3D iio_priv(indio_dev); + + return st->wait_event; +} + +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 =3D iio_priv(indio_dev); + int ret =3D -EBUSY; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + if (st->wait_event =3D=3D state) { + iio_device_release_direct(indio_dev); + return 0; + } + + if (state) + ret =3D ad4052_monitor_mode_enable(st); + else + ret =3D ad4052_monitor_mode_disable(st); + + if (!ret) + st->wait_event =3D state; + + 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 =3D iio_priv(indio_dev); + u8 reg, size =3D 1; + int ret; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + if (st->wait_event) { + iio_device_release_direct(indio_dev); + return -EBUSY; + } + + switch (info) { + case IIO_EV_INFO_VALUE: + if (dir =3D=3D IIO_EV_DIR_RISING) + reg =3D AD4052_REG_MAX_LIMIT; + else + reg =3D AD4052_REG_MIN_LIMIT; + size =3D 2; + break; + case IIO_EV_INFO_HYSTERESIS: + if (dir =3D=3D IIO_EV_DIR_RISING) + reg =3D AD4052_REG_MAX_HYST; + else + reg =3D AD4052_REG_MIN_HYST; + break; + default: + ret =3D -EINVAL; + goto out_release; + } + + ret =3D regmap_bulk_read(st->regmap, reg, &st->d32, size); + if (ret) + goto out_release; + + if (reg =3D=3D AD4052_REG_MAX_LIMIT || reg =3D=3D AD4052_REG_MIN_LIMIT) { + *val =3D be16_to_cpu(st->d16); + if (st->data_format & AD4052_ADC_MODES_DATA_FORMAT) + *val =3D sign_extend32(*val, 11); + } else { + *val =3D be32_to_cpu(st->d32); + } + +out_release: + iio_device_release_direct(indio_dev); + return ret ? ret : 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 =3D iio_priv(indio_dev); + int ret =3D -EINVAL; + u8 reg, size =3D 1; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + if (st->wait_event) { + iio_device_release_direct(indio_dev); + return -EBUSY; + } + + switch (type) { + case IIO_EV_TYPE_THRESH: + switch (info) { + case IIO_EV_INFO_VALUE: + if (st->data_format & AD4052_ADC_MODES_DATA_FORMAT) { + if (val > 2047 || val < -2048) + goto out_release; + } else if (val > 4095 || val < 0) { + goto out_release; + } + if (dir =3D=3D IIO_EV_DIR_RISING) + reg =3D AD4052_REG_MAX_LIMIT; + else + reg =3D AD4052_REG_MIN_LIMIT; + size =3D 2; + st->d16 =3D cpu_to_be16(val); + break; + case IIO_EV_INFO_HYSTERESIS: + if (val & BIT(7)) + goto out_release; + if (dir =3D=3D IIO_EV_DIR_RISING) + reg =3D AD4052_REG_MAX_HYST; + else + reg =3D AD4052_REG_MIN_HYST; + st->d16 =3D cpu_to_be16(val >> 8); + break; + default: + goto out_release; + } + break; + default: + goto out_release; + } + + ret =3D regmap_bulk_write(st->regmap, reg, &st->d16, size); + +out_release: + iio_device_release_direct(indio_dev); + return ret; +} + +static int ad4052_buffer_postenable(struct iio_dev *indio_dev) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + struct spi_offload_trigger_config config =3D { + .type =3D SPI_OFFLOAD_TRIGGER_DATA_READY, + }; + int ret; + + if (st->wait_event) + return -EBUSY; + + ret =3D pm_runtime_resume_and_get(&st->spi->dev); + if (ret) + return ret; + + ret =3D ad4052_set_operation_mode(st, st->mode); + if (ret) + goto out_error; + + ret =3D ad4052_update_xfer_offload(indio_dev, indio_dev->channels); + if (ret) + goto out_error; + + /* SPI Offload handles the data ready irq */ + disable_irq(st->gp1_irq); + + ret =3D spi_offload_trigger_enable(st->offload, st->offload_trigger, + &config); + if (ret) + goto out_offload_error; + + ret =3D pwm_enable(st->cnv_pwm); + if (ret) + goto out_pwm_error; + + return 0; + +out_pwm_error: + spi_offload_trigger_disable(st->offload, st->offload_trigger); +out_offload_error: + enable_irq(st->gp1_irq); + spi_unoptimize_message(&st->offload_msg); + 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_buffer_predisable(struct iio_dev *indio_dev) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + int ret; + + pwm_disable(st->cnv_pwm); + + spi_offload_trigger_disable(st->offload, st->offload_trigger); + spi_unoptimize_message(&st->offload_msg); + enable_irq(st->gp1_irq); + + ret =3D 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 =3D { + .postenable =3D &ad4052_buffer_postenable, + .predisable =3D &ad4052_buffer_predisable, +}; + +static int ad4052_debugfs_reg_access(struct iio_dev *indio_dev, unsigned i= nt reg, + unsigned int writeval, unsigned int *readval) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + int ret; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + if (st->wait_event) { + iio_device_release_direct(indio_dev); + return -EBUSY; + } + + if (readval) + ret =3D regmap_read(st->regmap, reg, readval); + else + ret =3D 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 =3D iio_priv(indio_dev); + + if (iio_buffer_enabled(indio_dev)) + return st->mode =3D=3D AD4052_BURST_AVERAGING_MODE ? + AD4052_SCAN_TYPE_OFFLOAD_BURST_AVG : + AD4052_SCAN_TYPE_OFFLOAD_SAMPLE; + + return st->mode =3D=3D AD4052_BURST_AVERAGING_MODE ? + AD4052_SCAN_TYPE_BURST_AVG : + AD4052_SCAN_TYPE_SAMPLE; +} + +static const struct iio_info ad4052_info =3D { + .read_raw =3D ad4052_read_raw, + .write_raw =3D ad4052_write_raw, + .read_avail =3D ad4052_read_avail, + .read_event_config =3D &ad4052_read_event_config, + .write_event_config =3D &ad4052_write_event_config, + .read_event_value =3D &ad4052_read_event_value, + .write_event_value =3D &ad4052_write_event_value, + .event_attrs =3D &ad4052_event_attribute_group, + .get_current_scan_type =3D &ad4052_get_current_scan_type, + .debugfs_reg_access =3D &ad4052_debugfs_reg_access, +}; + +static const struct regmap_config ad4052_regmap_config =3D { + .name =3D "ad4052", + .reg_bits =3D 8, + .val_bits =3D 8, + .max_register =3D AD4052_MAX_REG, + .rd_table =3D &ad4052_regmap_rd_table, + .wr_table =3D &ad4052_regmap_wr_table, + .read_flag_mask =3D BIT(7), + .can_sleep =3D true, +}; + +static const struct spi_offload_config ad4052_offload_config =3D { + .capability_flags =3D SPI_OFFLOAD_CAP_TRIGGER | + SPI_OFFLOAD_CAP_RX_STREAM_DMA, +}; + +static void ad4052_pwm_disable(void *pwm) +{ + pwm_disable(pwm); +} + +static bool ad4052_offload_trigger_match(struct spi_offload_trigger *trigg= er, + enum spi_offload_trigger_type type, + u64 *args, u32 nargs) +{ + return type =3D=3D SPI_OFFLOAD_TRIGGER_DATA_READY; +} + +static const struct spi_offload_trigger_ops ad4052_offload_trigger_ops =3D= { + .match =3D ad4052_offload_trigger_match, +}; + +static int ad4052_request_offload(struct iio_dev *indio_dev) +{ + struct ad4052_state *st =3D iio_priv(indio_dev); + struct device *dev =3D &st->spi->dev; + struct dma_chan *rx_dma; + struct spi_offload_trigger_info trigger_info =3D { + .fwnode =3D dev_fwnode(dev), + .ops =3D &ad4052_offload_trigger_ops, + .priv =3D st, + }; + struct pwm_state pwm_st; + int ret; + + indio_dev->setup_ops =3D &ad4052_buffer_setup_ops; + + ret =3D devm_spi_offload_trigger_register(dev, &trigger_info); + if (ret) + return dev_err_probe(dev, ret, + "failed to register offload trigger\n"); + + st->offload_trigger =3D devm_spi_offload_trigger_get(dev, st->offload, + SPI_OFFLOAD_TRIGGER_DATA_READY); + if (IS_ERR(st->offload_trigger)) + return PTR_ERR(st->offload_trigger); + + st->cnv_pwm =3D devm_pwm_get(dev, NULL); + if (IS_ERR(st->cnv_pwm)) + return dev_err_probe(dev, PTR_ERR(st->cnv_pwm), + "failed to get CNV PWM\n"); + + pwm_init_state(st->cnv_pwm, &pwm_st); + + pwm_st.enabled =3D false; + pwm_st.duty_cycle =3D AD4052_T_CNVH_NS * 2; + pwm_st.period =3D DIV_ROUND_UP_ULL(NSEC_PER_SEC, + AD4052_MAX_RATE(st->grade)); + + ret =3D pwm_apply_might_sleep(st->cnv_pwm, &pwm_st); + if (ret) + return dev_err_probe(dev, ret, "failed to apply CNV PWM\n"); + + ret =3D devm_add_action_or_reset(dev, ad4052_pwm_disable, st->cnv_pwm); + if (ret) + return ret; + + rx_dma =3D 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 =3D &spi->dev; + struct iio_dev *indio_dev; + struct ad4052_state *st; + int ret =3D 0; + + chip =3D spi_get_device_match_data(spi); + if (!chip) + return dev_err_probe(dev, -ENODEV, + "Could not find chip info data\n"); + + indio_dev =3D devm_iio_device_alloc(dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st =3D iio_priv(indio_dev); + st->spi =3D spi; + spi_set_drvdata(spi, st); + init_completion(&st->completion); + + st->regmap =3D devm_regmap_init_spi(spi, &ad4052_regmap_config); + if (IS_ERR(st->regmap)) + return dev_err_probe(dev, PTR_ERR(st->regmap), + "Failed to initialize regmap\n"); + + st->mode =3D AD4052_SAMPLE_MODE; + st->wait_event =3D false; + st->chip =3D chip; + st->grade =3D chip->prod_id <=3D 0x75 ? AD4052_2MSPS : AD4052_500KSPS; + st->oversampling_frequency =3D AD4052_FS_OFFSET(st->grade); + st->events_frequency =3D AD4052_FS_OFFSET(st->grade); + + st->cnv_gp =3D 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 =3D INDIO_BUFFER_HARDWARE | INDIO_DIRECT_MODE; + indio_dev->num_channels =3D 1; + indio_dev->info =3D &ad4052_info; + indio_dev->name =3D chip->name; + + st->offload =3D devm_spi_offload_get(dev, spi, &ad4052_offload_config); + if (IS_ERR(st->offload)) + return PTR_ERR(st->offload); + + if (ret && ret !=3D -ENODEV) + return dev_err_probe(dev, ret, "Failed to get offload\n"); + + if (ret =3D=3D -ENODEV) { + st->offload_trigger =3D NULL; + indio_dev->channels =3D chip->channels; + } else { + indio_dev->channels =3D chip->offload_channels; + ret =3D ad4052_request_offload(indio_dev); + if (ret) + return dev_err_probe(dev, ret, + "Failed to configure offload\n"); + } + + st->xfer.rx_buf =3D &st->d32; + + ret =3D ad4052_soft_reset(st); + if (ret) + return dev_err_probe(dev, ret, "AD4052 failed to soft reset\n"); + + ret =3D ad4052_check_ids(st); + if (ret) + return dev_err_probe(dev, ret, + "AD4052 fields assertions failed\n"); + + ret =3D ad4052_setup(indio_dev, indio_dev->channels); + if (ret) + return ret; + + ret =3D regmap_write(st->regmap, AD4052_REG_DEVICE_STATUS, + AD4052_DEVICE_STATUS_DEVICE_RESET); + if (ret) + return ret; + + ret =3D ad4052_request_irq(indio_dev); + if (ret) + return ret; + + ad4052_update_xfer_raw(indio_dev, indio_dev->channels); + + pm_runtime_set_active(dev); + ret =3D devm_pm_runtime_enable(dev); + if (ret) + return dev_err_probe(dev, ret, + "Failed to enable pm_runtime\n"); + + pm_runtime_set_autosuspend_delay(dev, 1000); + pm_runtime_use_autosuspend(dev); + + return devm_iio_device_register(dev, indio_dev); +} + +static int ad4052_runtime_suspend(struct device *dev) +{ + struct ad4052_state *st =3D dev_get_drvdata(dev); + + return regmap_write(st->regmap, AD4052_REG_DEVICE_CONFIG, + FIELD_PREP(AD4052_DEVICE_CONFIG_POWER_MODE_MSK, + AD4052_DEVICE_CONFIG_LOW_POWER_MODE)); +} + +static int ad4052_runtime_resume(struct device *dev) +{ + struct ad4052_state *st =3D dev_get_drvdata(dev); + int ret; + + ret =3D regmap_write(st->regmap, AD4052_REG_DEVICE_CONFIG, + FIELD_PREP(AD4052_DEVICE_CONFIG_POWER_MODE_MSK, 0)); + return ret; +} + +static DEFINE_RUNTIME_DEV_PM_OPS(ad4052_pm_ops, ad4052_runtime_suspend, + ad4052_runtime_resume, NULL); + +static const struct spi_device_id ad4052_id_table[] =3D { + {"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[] =3D { + { .compatible =3D "adi,ad4050", .data =3D &ad4050_chip_info }, + { .compatible =3D "adi,ad4052", .data =3D &ad4052_chip_info }, + { .compatible =3D "adi,ad4056", .data =3D &ad4056_chip_info }, + { .compatible =3D "adi,ad4058", .data =3D &ad4058_chip_info }, + { } +}; +MODULE_DEVICE_TABLE(of, ad4052_of_match); + +static struct spi_driver ad4052_driver =3D { + .driver =3D { + .name =3D "ad4052", + .of_match_table =3D ad4052_of_match, + .pm =3D pm_ptr(&ad4052_pm_ops), + }, + .probe =3D ad4052_probe, + .id_table =3D ad4052_id_table, +}; +module_spi_driver(ad4052_driver); + +MODULE_AUTHOR("Jorge Marques "); +MODULE_DESCRIPTION("Analog Devices AD4052"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("IIO_DMAENGINE_BUFFER"); --=20 2.49.0