mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-20 14:16:02 +00:00
![George Mois](/assets/img/avatar_default.png)
ADXL312 and ADXL314 are small, thin, low power, 3-axis accelerometers with high resolution (13-bit) measurement up to +/-12 g and +/- 200 g respectively. Implement support for ADXL312 and ADXL314 by extending the ADXL313 driver. Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL312.pdf Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL314.pdf Signed-off-by: George Mois <george.mois@analog.com> Link: https://lore.kernel.org/r/20220905132018.364900-2-george.mois@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
424 lines
12 KiB
C
424 lines
12 KiB
C
// 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/module.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "adxl313.h"
|
|
|
|
static const struct regmap_range adxl312_readable_reg_range[] = {
|
|
regmap_reg_range(ADXL313_REG_DEVID0, ADXL313_REG_DEVID0),
|
|
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),
|
|
};
|
|
|
|
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 adxl312_readable_regs_table = {
|
|
.yes_ranges = adxl312_readable_reg_range,
|
|
.n_yes_ranges = ARRAY_SIZE(adxl312_readable_reg_range),
|
|
};
|
|
EXPORT_SYMBOL_NS_GPL(adxl312_readable_regs_table, IIO_ADXL313);
|
|
|
|
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_NS_GPL(adxl313_readable_regs_table, IIO_ADXL313);
|
|
|
|
const struct regmap_access_table adxl314_readable_regs_table = {
|
|
.yes_ranges = adxl312_readable_reg_range,
|
|
.n_yes_ranges = ARRAY_SIZE(adxl312_readable_reg_range),
|
|
};
|
|
EXPORT_SYMBOL_NS_GPL(adxl314_readable_regs_table, IIO_ADXL313);
|
|
|
|
static int adxl312_check_id(struct device *dev,
|
|
struct adxl313_data *data)
|
|
{
|
|
unsigned int regval;
|
|
int ret;
|
|
|
|
ret = regmap_read(data->regmap, ADXL313_REG_DEVID0, ®val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (regval != ADXL313_DEVID0_ADXL312_314)
|
|
dev_warn(dev, "Invalid manufacturer ID: %#02x\n", regval);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int adxl313_check_id(struct device *dev,
|
|
struct adxl313_data *data)
|
|
{
|
|
unsigned int regval;
|
|
int ret;
|
|
|
|
ret = regmap_read(data->regmap, ADXL313_REG_DEVID0, ®val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (regval != ADXL313_DEVID0)
|
|
dev_warn(dev, "Invalid manufacturer ID: 0x%02x\n", regval);
|
|
|
|
/* Check DEVID1 and PARTID */
|
|
if (regval == ADXL313_DEVID0) {
|
|
ret = regmap_read(data->regmap, ADXL313_REG_DEVID1, ®val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (regval != ADXL313_DEVID1)
|
|
dev_warn(dev, "Invalid mems ID: 0x%02x\n", regval);
|
|
|
|
ret = regmap_read(data->regmap, ADXL313_REG_PARTID, ®val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (regval != ADXL313_PARTID)
|
|
dev_warn(dev, "Invalid device ID: 0x%02x\n", regval);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct adxl313_chip_info adxl31x_chip_info[] = {
|
|
[ADXL312] = {
|
|
.name = "adxl312",
|
|
.type = ADXL312,
|
|
.scale_factor = 28425072,
|
|
.variable_range = true,
|
|
.soft_reset = false,
|
|
.check_id = &adxl312_check_id,
|
|
},
|
|
[ADXL313] = {
|
|
.name = "adxl313",
|
|
.type = ADXL313,
|
|
.scale_factor = 9576806,
|
|
.variable_range = true,
|
|
.soft_reset = true,
|
|
.check_id = &adxl313_check_id,
|
|
},
|
|
[ADXL314] = {
|
|
.name = "adxl314",
|
|
.type = ADXL314,
|
|
.scale_factor = 478858719,
|
|
.variable_range = false,
|
|
.soft_reset = false,
|
|
.check_id = &adxl312_check_id,
|
|
},
|
|
};
|
|
EXPORT_SYMBOL_NS_GPL(adxl31x_chip_info, IIO_ADXL313);
|
|
|
|
static const struct regmap_range adxl312_writable_reg_range[] = {
|
|
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),
|
|
};
|
|
|
|
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 adxl312_writable_regs_table = {
|
|
.yes_ranges = adxl312_writable_reg_range,
|
|
.n_yes_ranges = ARRAY_SIZE(adxl312_writable_reg_range),
|
|
};
|
|
EXPORT_SYMBOL_NS_GPL(adxl312_writable_regs_table, IIO_ADXL313);
|
|
|
|
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_NS_GPL(adxl313_writable_regs_table, IIO_ADXL313);
|
|
|
|
const struct regmap_access_table adxl314_writable_regs_table = {
|
|
.yes_ranges = adxl312_writable_reg_range,
|
|
.n_yes_ranges = ARRAY_SIZE(adxl312_writable_reg_range),
|
|
};
|
|
EXPORT_SYMBOL_NS_GPL(adxl314_writable_regs_table, IIO_ADXL313);
|
|
|
|
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:
|
|
*val = 0;
|
|
|
|
*val2 = data->chip_info->scale_factor;
|
|
|
|
return IIO_VAL_INT_PLUS_NANO;
|
|
case IIO_CHAN_INFO_CALIBBIAS:
|
|
ret = regmap_read(data->regmap,
|
|
ADXL313_REG_OFS_AXIS(chan->address), ®val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* 8-bit resolution at minimum range, 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 minimum range, 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 *))
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* If sw reset available, ensures the device is in a consistent
|
|
* state after start up
|
|
*/
|
|
if (data->chip_info->soft_reset) {
|
|
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 = data->chip_info->check_id(dev, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Sets the range to maximum, full resolution, if applicable */
|
|
if (data->chip_info->variable_range) {
|
|
ret = regmap_update_bits(data->regmap, ADXL313_REG_DATA_FORMAT,
|
|
ADXL313_RANGE_MSK,
|
|
FIELD_PREP(ADXL313_RANGE_MSK, ADXL313_RANGE_MAX));
|
|
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
|
|
* @chip_info: Structure containing device specific data
|
|
* @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 struct adxl313_chip_info *chip_info,
|
|
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;
|
|
data->chip_info = chip_info;
|
|
|
|
mutex_init(&data->lock);
|
|
|
|
indio_dev->name = chip_info->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_NS_GPL(adxl313_core_probe, IIO_ADXL313);
|
|
|
|
MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>");
|
|
MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer core driver");
|
|
MODULE_LICENSE("GPL v2");
|