| // 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_NS_GPL(adxl313_readable_regs_table, IIO_ADXL313); |
| |
| 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_NS_GPL(adxl313_writable_regs_table, IIO_ADXL313); |
| |
| struct adxl313_data { |
| struct regmap *regmap; |
| struct mutex lock; /* lock to protect transf_buf */ |
| __le16 transf_buf __aligned(IIO_DMA_MINALIGN); |
| }; |
| |
| 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), ®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->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, ®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); |
| } |
| |
| /** |
| * 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_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"); |