Re: [PATCH v2 2/2] iio: accel: Add driver support for ADXL313

[Lucas Stankus]

On Fri, Aug 6, 2021 at 9:35 AM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
>
>
>
> On Thursday, August 5, 2021, Lucas Stankus <lucas.p.stankus@xxxxxxxxx> wrote:
>>
>> 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>
>> ---
>>  MAINTAINERS                      |   9 +
>>  drivers/iio/accel/Kconfig        |  29 +++
>>  drivers/iio/accel/Makefile       |   3 +
>>  drivers/iio/accel/adxl313.h      |  63 ++++++
>>  drivers/iio/accel/adxl313_core.c | 321 +++++++++++++++++++++++++++++++
>>  drivers/iio/accel/adxl313_i2c.c  |  65 +++++++
>>  drivers/iio/accel/adxl313_spi.c  |  85 ++++++++
>>  7 files changed, 575 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 a61f4f3b78a9..566055450b6b 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -585,6 +585,15 @@ 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.h
>> +F:     drivers/iio/accel/adxl313_core.c
>> +F:     drivers/iio/accel/adxl313_i2c.c
>> +F:     drivers/iio/accel/adxl313_spi.c
>
>
>
> adxl313*?
>

Didn't know this would work, but I think I prefer the way it is now.
Are you proposing this as a suggestion or more of a change request?

>>
>> +
>>  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 0e56ace61103..ae621532e716 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..ea5994227a2e
>> --- /dev/null
>> +++ b/drivers/iio/accel/adxl313.h
>> @@ -0,0 +1,63 @@
>> +/* 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)
>> +
>> +/*
>> + * Scale for any g range is given in datasheet as
>> + * 1024 LSB/g = 0.0009765625 * 9.80665 = 0.009576806640625 m/s^2
>> + */
>> +#define ADXL313_NSCALE 9576806
>
>
>
> Is it in nanonewtons? Perhaps add a suffix _nN?
>

It's actually in meters per second squared, so I couldn't come up with
a good suffix. Do you have any suggestions?

>>
>> +
>> +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..ed4484607556
>> --- /dev/null
>> +++ b/drivers/iio/accel/adxl313_core.c
>> @@ -0,0 +1,321 @@
>> +// 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:
>> +               *val = 0;
>> +               *val2 = ADXL313_NSCALE;
>> +               return IIO_VAL_INT_PLUS_NANO;
>> +       case IIO_CHAN_INFO_CALIBBIAS:
>> +               ret = regmap_read(data->regmap,
>> +                                 ADXL313_REG_OFS_AXIS(chan->scan_index),
>> +                                 &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 (val > 127 * 4 || val < -128 * 4)
>
>
> if (clamp_val(val, ...) != val) ?
>
> But actually i would like rather to see predefined macro is_in_range() in minmax.h.
>

Yeah, a `is_in_range()` macro would be nice for this case, but anyway,
I think the clamp_val is a cleaner solution.

>
>>
>> +                       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;
>> +
>> +       ret = regmap_read(data->regmap, ADXL313_REG_DEVID0, &regval);
>> +       if (ret)
>> +               return ret;
>> +
>> +       if (interface_specific_setup) {
>> +               ret = interface_specific_setup(dev, data->regmap);
>> +               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);
>> +}
>> +
>> +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..d60e757cae07
>> --- /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
>
>
>
> Leave comma here
>

I'll add them for the v3.

>>
>> +};
>> +
>> +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..b5804522d9ff
>> --- /dev/null
>> +++ b/drivers/iio/accel/adxl313_spi.c
>> @@ -0,0 +1,85 @@
>> +// 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)
>
>
>
>  Ditto
>
>> +};
>> +
>> +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;
>> +
>> +       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
>>
>
>
> --
> With Best Regards,
> Andy Shevchenko
>
>