iio: accel: Add driver support for ADXL313

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@gmail.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/d16e2d1967e46bb2b1024b6d23bc4889da77dc6b.1630523106.git.lucas.p.stankus@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Lucas Stankus 2021-09-01 16:14:54 -03:00 committed by Jonathan Cameron
parent af1c6b50a2
commit 636d446330
7 changed files with 582 additions and 0 deletions

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@ -590,6 +590,12 @@ L: platform-driver-x86@vger.kernel.org
S: Maintained
F: drivers/platform/x86/adv_swbutton.c
ADXL313 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
M: Lucas Stankus <lucas.p.stankus@gmail.com>
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@analog.com>
S: Supported

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@ -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

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@ -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

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@ -0,0 +1,54 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* ADXL313 3-Axis Digital Accelerometer
*
* Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
*/
#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_DATA_AXIS(index) (0x32 + ((index) * 2))
#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 (*setup)(struct device *, struct regmap *));
#endif /* _ADXL313_H_ */

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@ -0,0 +1,332 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* ADXL313 3-Axis Digital Accelerometer
*
* Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
*
* 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"
static 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);
static 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, axis) { \
.type = IIO_ACCEL, \
.address = index, \
.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_type = { \
.realbits = 13, \
}, \
}
static const struct iio_chan_spec adxl313_channels[] = {
ADXL313_ACCEL_CHANNEL(0, X),
ADXL313_ACCEL_CHANNEL(1, Y),
ADXL313_ACCEL_CHANNEL(2, 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,
ADXL313_REG_DATA_AXIS(chan->address),
&data->transf_buf, sizeof(data->transf_buf));
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->address), &regval);
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, &regval);
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->address),
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 (*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 (setup) {
ret = setup(dev, data->regmap);
if (ret)
return ret;
}
ret = regmap_read(data->regmap, ADXL313_REG_DEVID0, &regval);
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, &regval);
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, &regval);
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);
}
/**
* adxl313_core_probe() - probe and setup for adxl313 accelerometer
* @dev: Driver model representation of the device
* @regmap: Register map of the device
* @name: Device name buffer reference
* @setup: Setup routine to be executed right before the standard device
* setup, can also be set to NULL if not required
*
* Return: 0 on success, negative errno on error cases
*/
int adxl313_core_probe(struct device *dev,
struct regmap *regmap,
const char *name,
int (*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, 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@gmail.com>");
MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer core driver");
MODULE_LICENSE("GPL v2");

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@ -0,0 +1,66 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* ADXL313 3-Axis Digital Accelerometer
*
* Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
*
* Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
*/
#include <linux/i2c.h>
#include <linux/mod_devicetable.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@gmail.com>");
MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer I2C driver");
MODULE_LICENSE("GPL v2");

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@ -0,0 +1,92 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* ADXL313 3-Axis Digital Accelerometer
*
* Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
*
* Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
*/
#include <linux/mod_devicetable.h>
#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@gmail.com>");
MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
MODULE_LICENSE("GPL v2");