ADXL313 is a small, thin, low power, 3-axis accelerometer with high resolution measurement up to +/-4g. It includes an integrated 32-level FIFO and has activity and inactivity sensing capabilities. Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf Signed-off-by: Lucas Stankus <lucas.p.stankus@xxxxxxxxx> Reviewed-by: Alexandru Ardelean <ardeleanalex@xxxxxxxxx> --- MAINTAINERS | 6 + drivers/iio/accel/Kconfig | 29 +++ drivers/iio/accel/Makefile | 3 + drivers/iio/accel/adxl313.h | 57 ++++++ drivers/iio/accel/adxl313_core.c | 331 +++++++++++++++++++++++++++++++ drivers/iio/accel/adxl313_i2c.c | 65 ++++++ drivers/iio/accel/adxl313_spi.c | 91 +++++++++ 7 files changed, 582 insertions(+) create mode 100644 drivers/iio/accel/adxl313.h create mode 100644 drivers/iio/accel/adxl313_core.c create mode 100644 drivers/iio/accel/adxl313_i2c.c create mode 100644 drivers/iio/accel/adxl313_spi.c diff --git a/MAINTAINERS b/MAINTAINERS index d0464b83b5b5..b2ada8ca1453 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -585,6 +585,12 @@ L: platform-driver-x86@xxxxxxxxxxxxxxx S: Maintained F: drivers/platform/x86/adv_swbutton.c +ADXL313 THREE-AXIS DIGITAL ACCELEROMETER DRIVER +M: Lucas Stankus <lucas.p.stankus@xxxxxxxxx> +S: Supported +F: Documentation/devicetree/bindings/iio/accel/adi,adxl313.yaml +F: drivers/iio/accel/adxl313* + ADXL34X THREE-AXIS DIGITAL ACCELEROMETER DRIVER (ADXL345/ADXL346) M: Michael Hennerich <michael.hennerich@xxxxxxxxxx> S: Supported diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index 2f0c0d512ae7..fb8349a88cd3 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -30,6 +30,35 @@ config ADIS16209 To compile this driver as a module, say M here: the module will be called adis16209. +config ADXL313 + tristate + +config ADXL313_I2C + tristate "Analog Devices ADXL313 3-Axis Digital Accelerometer I2C Driver" + depends on I2C + select ADXL313 + select REGMAP_I2C + help + Say Y here if you want to build i2c support for the Analog Devices + ADXL313 3-axis digital accelerometer. + + To compile this driver as a module, choose M here: the module + will be called adxl313_i2c and you will also get adxl313_core + for the core module. + +config ADXL313_SPI + tristate "Analog Devices ADXL313 3-Axis Digital Accelerometer SPI Driver" + depends on SPI + select ADXL313 + select REGMAP_SPI + help + Say Y here if you want to build spi support for the Analog Devices + ADXL313 3-axis digital accelerometer. + + To compile this driver as a module, choose M here: the module + will be called adxl313_spi and you will also get adxl313_core + for the core module. + config ADXL345 tristate diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile index 89280e823bcd..fadc92816e24 100644 --- a/drivers/iio/accel/Makefile +++ b/drivers/iio/accel/Makefile @@ -6,6 +6,9 @@ # When adding new entries keep the list in alphabetical order obj-$(CONFIG_ADIS16201) += adis16201.o obj-$(CONFIG_ADIS16209) += adis16209.o +obj-$(CONFIG_ADXL313) += adxl313_core.o +obj-$(CONFIG_ADXL313_I2C) += adxl313_i2c.o +obj-$(CONFIG_ADXL313_SPI) += adxl313_spi.o obj-$(CONFIG_ADXL345) += adxl345_core.o obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o diff --git a/drivers/iio/accel/adxl313.h b/drivers/iio/accel/adxl313.h new file mode 100644 index 000000000000..c170b5236988 --- /dev/null +++ b/drivers/iio/accel/adxl313.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * ADXL313 3-Axis Digital Accelerometer + * + * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@xxxxxxxxx> + */ + +#ifndef _ADXL313_H_ +#define _ADXL313_H_ + +/* ADXL313 register definitions */ +#define ADXL313_REG_DEVID0 0x00 +#define ADXL313_REG_DEVID1 0x01 +#define ADXL313_REG_PARTID 0x02 +#define ADXL313_REG_XID 0x04 +#define ADXL313_REG_SOFT_RESET 0x18 +#define ADXL313_REG_OFS_AXIS(index) (0x1E + (index)) +#define ADXL313_REG_THRESH_ACT 0x24 +#define ADXL313_REG_ACT_INACT_CTL 0x27 +#define ADXL313_REG_BW_RATE 0x2C +#define ADXL313_REG_POWER_CTL 0x2D +#define ADXL313_REG_INT_MAP 0x2F +#define ADXL313_REG_DATA_FORMAT 0x31 +#define ADXL313_REG_DATAX 0x32 +#define ADXL313_REG_DATAY 0x34 +#define ADXL313_REG_DATAZ 0x36 +#define ADXL313_REG_FIFO_CTL 0x38 +#define ADXL313_REG_FIFO_STATUS 0x39 + +#define ADXL313_DEVID0 0xAD +#define ADXL313_DEVID1 0x1D +#define ADXL313_PARTID 0xCB +#define ADXL313_SOFT_RESET 0x52 + +#define ADXL313_RATE_MSK GENMASK(3, 0) +#define ADXL313_RATE_BASE 6 + +#define ADXL313_POWER_CTL_MSK GENMASK(3, 2) +#define ADXL313_MEASUREMENT_MODE BIT(3) + +#define ADXL313_RANGE_MSK GENMASK(1, 0) +#define ADXL313_RANGE_4G 3 + +#define ADXL313_FULL_RES BIT(3) +#define ADXL313_SPI_3WIRE BIT(6) +#define ADXL313_I2C_DISABLE BIT(6) + +extern const struct regmap_access_table adxl313_readable_regs_table; + +extern const struct regmap_access_table adxl313_writable_regs_table; + +int adxl313_core_probe(struct device *dev, + struct regmap *regmap, + const char *name, + int (*interface_specific_setup)(struct device *, + struct regmap *)); +#endif /* _ADXL313_H_ */ diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c new file mode 100644 index 000000000000..8f3d4f5281c4 --- /dev/null +++ b/drivers/iio/accel/adxl313_core.c @@ -0,0 +1,331 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ADXL313 3-Axis Digital Accelerometer + * + * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@xxxxxxxxx> + * + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf + */ + +#include <linux/bitfield.h> +#include <linux/iio/iio.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#include "adxl313.h" + +const struct regmap_range adxl313_readable_reg_range[] = { + regmap_reg_range(ADXL313_REG_DEVID0, ADXL313_REG_XID), + regmap_reg_range(ADXL313_REG_SOFT_RESET, ADXL313_REG_SOFT_RESET), + regmap_reg_range(ADXL313_REG_OFS_AXIS(0), ADXL313_REG_OFS_AXIS(2)), + regmap_reg_range(ADXL313_REG_THRESH_ACT, ADXL313_REG_ACT_INACT_CTL), + regmap_reg_range(ADXL313_REG_BW_RATE, ADXL313_REG_FIFO_STATUS) +}; + +const struct regmap_access_table adxl313_readable_regs_table = { + .yes_ranges = adxl313_readable_reg_range, + .n_yes_ranges = ARRAY_SIZE(adxl313_readable_reg_range) +}; +EXPORT_SYMBOL_GPL(adxl313_readable_regs_table); + +const struct regmap_range adxl313_writable_reg_range[] = { + regmap_reg_range(ADXL313_REG_SOFT_RESET, ADXL313_REG_SOFT_RESET), + regmap_reg_range(ADXL313_REG_OFS_AXIS(0), ADXL313_REG_OFS_AXIS(2)), + regmap_reg_range(ADXL313_REG_THRESH_ACT, ADXL313_REG_ACT_INACT_CTL), + regmap_reg_range(ADXL313_REG_BW_RATE, ADXL313_REG_INT_MAP), + regmap_reg_range(ADXL313_REG_DATA_FORMAT, ADXL313_REG_DATA_FORMAT), + regmap_reg_range(ADXL313_REG_FIFO_CTL, ADXL313_REG_FIFO_CTL) +}; + +const struct regmap_access_table adxl313_writable_regs_table = { + .yes_ranges = adxl313_writable_reg_range, + .n_yes_ranges = ARRAY_SIZE(adxl313_writable_reg_range) +}; +EXPORT_SYMBOL_GPL(adxl313_writable_regs_table); + +struct adxl313_data { + struct regmap *regmap; + struct mutex lock; /* lock to protect transf_buf */ + __le16 transf_buf ____cacheline_aligned; +}; + +static const int adxl313_odr_freqs[][2] = { + [0] = { 6, 250000 }, + [1] = { 12, 500000 }, + [2] = { 25, 0 }, + [3] = { 50, 0 }, + [4] = { 100, 0 }, + [5] = { 200, 0 }, + [6] = { 400, 0 }, + [7] = { 800, 0 }, + [8] = { 1600, 0 }, + [9] = { 3200, 0 }, +}; + +#define ADXL313_ACCEL_CHANNEL(index, addr, axis) { \ + .type = IIO_ACCEL, \ + .address = addr, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_CALIBBIAS), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .info_mask_shared_by_type_available = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .scan_index = index, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 13, \ + .storagebits = 16, \ + .endianness = IIO_LE, \ + }, \ +} + +static const struct iio_chan_spec adxl313_channels[] = { + ADXL313_ACCEL_CHANNEL(0, ADXL313_REG_DATAX, X), + ADXL313_ACCEL_CHANNEL(1, ADXL313_REG_DATAY, Y), + ADXL313_ACCEL_CHANNEL(2, ADXL313_REG_DATAZ, Z), +}; + +static int adxl313_set_odr(struct adxl313_data *data, + unsigned int freq1, unsigned int freq2) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(adxl313_odr_freqs); i++) { + if (adxl313_odr_freqs[i][0] == freq1 && + adxl313_odr_freqs[i][1] == freq2) + break; + } + + if (i == ARRAY_SIZE(adxl313_odr_freqs)) + return -EINVAL; + + return regmap_update_bits(data->regmap, ADXL313_REG_BW_RATE, + ADXL313_RATE_MSK, + FIELD_PREP(ADXL313_RATE_MSK, + ADXL313_RATE_BASE + i)); +} + +static int adxl313_read_axis(struct adxl313_data *data, + struct iio_chan_spec const *chan) +{ + int ret; + + mutex_lock(&data->lock); + + ret = regmap_bulk_read(data->regmap, + chan->address, + &data->transf_buf, 2); + if (ret) + goto unlock_ret; + + ret = le16_to_cpu(data->transf_buf); + +unlock_ret: + mutex_unlock(&data->lock); + return ret; +} + +static int adxl313_read_freq_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + *vals = (const int *)adxl313_odr_freqs; + *length = ARRAY_SIZE(adxl313_odr_freqs) * 2; + *type = IIO_VAL_INT_PLUS_MICRO; + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static int adxl313_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct adxl313_data *data = iio_priv(indio_dev); + unsigned int regval; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = adxl313_read_axis(data, chan); + if (ret < 0) + return ret; + + *val = sign_extend32(ret, chan->scan_type.realbits - 1); + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + /* + * Scale for any g range is given in datasheet as + * 1024 LSB/g = 0.0009765625 * 9.80665 = 0.009576806640625 m/s^2 + */ + *val = 0; + *val2 = 9576806; + return IIO_VAL_INT_PLUS_NANO; + case IIO_CHAN_INFO_CALIBBIAS: + ret = regmap_read(data->regmap, + ADXL313_REG_OFS_AXIS(chan->scan_index), + ®val); + if (ret) + return ret; + + /* + * 8-bit resolution at +/- 0.5g, that is 4x accel data scale + * factor at full resolution + */ + *val = sign_extend32(regval, 7) * 4; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + ret = regmap_read(data->regmap, ADXL313_REG_BW_RATE, ®val); + if (ret) + return ret; + + ret = FIELD_GET(ADXL313_RATE_MSK, regval) - ADXL313_RATE_BASE; + *val = adxl313_odr_freqs[ret][0]; + *val2 = adxl313_odr_freqs[ret][1]; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } +} + +static int adxl313_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct adxl313_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_CALIBBIAS: + /* + * 8-bit resolution at +/- 0.5g, that is 4x accel data scale + * factor at full resolution + */ + if (clamp_val(val, -128 * 4, 127 * 4) != val) + return -EINVAL; + + return regmap_write(data->regmap, + ADXL313_REG_OFS_AXIS(chan->scan_index), + val / 4); + case IIO_CHAN_INFO_SAMP_FREQ: + return adxl313_set_odr(data, val, val2); + default: + return -EINVAL; + } +} + +static const struct iio_info adxl313_info = { + .read_raw = adxl313_read_raw, + .write_raw = adxl313_write_raw, + .read_avail = adxl313_read_freq_avail +}; + +static int adxl313_setup(struct device *dev, struct adxl313_data *data, + int (*interface_specific_setup)(struct device *, + struct regmap *)) +{ + unsigned int regval; + int ret; + + /* Ensures the device is in a consistent state after start up */ + ret = regmap_write(data->regmap, ADXL313_REG_SOFT_RESET, + ADXL313_SOFT_RESET); + if (ret) + return ret; + + if (interface_specific_setup) { + ret = interface_specific_setup(dev, data->regmap); + if (ret) + return ret; + } + + ret = regmap_read(data->regmap, ADXL313_REG_DEVID0, ®val); + if (ret) + return ret; + + if (regval != ADXL313_DEVID0) { + dev_err(dev, "Invalid manufacturer ID: 0x%02x\n", regval); + return -ENODEV; + } + + ret = regmap_read(data->regmap, ADXL313_REG_DEVID1, ®val); + if (ret) + return ret; + + if (regval != ADXL313_DEVID1) { + dev_err(dev, "Invalid mems ID: 0x%02x\n", regval); + return -ENODEV; + } + + ret = regmap_read(data->regmap, ADXL313_REG_PARTID, ®val); + if (ret) + return ret; + + if (regval != ADXL313_PARTID) { + dev_err(dev, "Invalid device ID: 0x%02x\n", regval); + return -ENODEV; + } + + /* Sets the range to +/- 4g */ + ret = regmap_update_bits(data->regmap, ADXL313_REG_DATA_FORMAT, + ADXL313_RANGE_MSK, + FIELD_PREP(ADXL313_RANGE_MSK, + ADXL313_RANGE_4G)); + if (ret) + return ret; + + /* Enables full resolution */ + ret = regmap_update_bits(data->regmap, ADXL313_REG_DATA_FORMAT, + ADXL313_FULL_RES, ADXL313_FULL_RES); + if (ret) + return ret; + + /* Enables measurement mode */ + return regmap_update_bits(data->regmap, ADXL313_REG_POWER_CTL, + ADXL313_POWER_CTL_MSK, + ADXL313_MEASUREMENT_MODE); +} + +int adxl313_core_probe(struct device *dev, + struct regmap *regmap, + const char *name, + int (*interface_specific_setup)(struct device *, + struct regmap *)) +{ + struct adxl313_data *data; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + data->regmap = regmap; + mutex_init(&data->lock); + + indio_dev->name = name; + indio_dev->info = &adxl313_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = adxl313_channels; + indio_dev->num_channels = ARRAY_SIZE(adxl313_channels); + + ret = adxl313_setup(dev, data, interface_specific_setup); + if (ret) { + dev_err(dev, "ADXL313 setup failed\n"); + return ret; + } + + return devm_iio_device_register(dev, indio_dev); +} +EXPORT_SYMBOL_GPL(adxl313_core_probe); + +MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@xxxxxxxxx>"); +MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer core driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/accel/adxl313_i2c.c b/drivers/iio/accel/adxl313_i2c.c new file mode 100644 index 000000000000..517c6f1c43ad --- /dev/null +++ b/drivers/iio/accel/adxl313_i2c.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ADXL313 3-Axis Digital Accelerometer + * + * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@xxxxxxxxx> + * + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf + */ + +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#include "adxl313.h" + +static const struct regmap_config adxl313_i2c_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .rd_table = &adxl313_readable_regs_table, + .wr_table = &adxl313_writable_regs_table, + .max_register = 0x39, +}; + +static int adxl313_i2c_probe(struct i2c_client *client) +{ + struct regmap *regmap; + + regmap = devm_regmap_init_i2c(client, &adxl313_i2c_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "Error initializing i2c regmap: %ld\n", + PTR_ERR(regmap)); + return PTR_ERR(regmap); + } + + return adxl313_core_probe(&client->dev, regmap, client->name, NULL); +} + +static const struct i2c_device_id adxl313_i2c_id[] = { + { "adxl313" }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, adxl313_i2c_id); + +static const struct of_device_id adxl313_of_match[] = { + { .compatible = "adi,adxl313" }, + { } +}; + +MODULE_DEVICE_TABLE(of, adxl313_of_match); + +static struct i2c_driver adxl313_i2c_driver = { + .driver = { + .name = "adxl313_i2c", + .of_match_table = adxl313_of_match, + }, + .probe_new = adxl313_i2c_probe, + .id_table = adxl313_i2c_id +}; + +module_i2c_driver(adxl313_i2c_driver); + +MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@xxxxxxxxx>"); +MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer I2C driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/accel/adxl313_spi.c b/drivers/iio/accel/adxl313_spi.c new file mode 100644 index 000000000000..4d625b1753a5 --- /dev/null +++ b/drivers/iio/accel/adxl313_spi.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ADXL313 3-Axis Digital Accelerometer + * + * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@xxxxxxxxx> + * + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf + */ + +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/spi/spi.h> + +#include "adxl313.h" + +static const struct regmap_config adxl313_spi_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .rd_table = &adxl313_readable_regs_table, + .wr_table = &adxl313_writable_regs_table, + .max_register = 0x39, + /* Setting bits 7 and 6 enables multiple-byte read */ + .read_flag_mask = BIT(7) | BIT(6), +}; + +static int adxl313_spi_setup(struct device *dev, struct regmap *regmap) +{ + struct spi_device *spi = container_of(dev, struct spi_device, dev); + int ret; + + if (spi->mode & SPI_3WIRE) { + ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT, + ADXL313_SPI_3WIRE); + if (ret) + return ret; + } + + return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL, + ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE); +} + +static int adxl313_spi_probe(struct spi_device *spi) +{ + const struct spi_device_id *id = spi_get_device_id(spi); + struct regmap *regmap; + int ret; + + spi->mode |= SPI_MODE_3; + ret = spi_setup(spi); + if (ret) + return ret; + + regmap = devm_regmap_init_spi(spi, &adxl313_spi_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&spi->dev, "Error initializing spi regmap: %ld\n", + PTR_ERR(regmap)); + return PTR_ERR(regmap); + } + + return adxl313_core_probe(&spi->dev, regmap, id->name, + &adxl313_spi_setup); +} + +static const struct spi_device_id adxl313_spi_id[] = { + { "adxl313" }, + { } +}; + +MODULE_DEVICE_TABLE(spi, adxl313_spi_id); + +static const struct of_device_id adxl313_of_match[] = { + { .compatible = "adi,adxl313" }, + { } +}; + +MODULE_DEVICE_TABLE(of, adxl313_of_match); + +static struct spi_driver adxl313_spi_driver = { + .driver = { + .name = "adxl313_spi", + .of_match_table = adxl313_of_match, + }, + .probe = adxl313_spi_probe, + .id_table = adxl313_spi_id +}; + +module_spi_driver(adxl313_spi_driver); + +MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@xxxxxxxxx>"); +MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver"); +MODULE_LICENSE("GPL v2"); -- 2.32.0
