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853 lines
20 KiB
853 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Core IIO driver for Bosch BMA400 triaxial acceleration sensor. |
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* |
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* Copyright 2019 Dan Robertson <[email protected]> |
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* |
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* TODO: |
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* - Support for power management |
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* - Support events and interrupts |
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* - Create channel for step count |
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* - Create channel for sensor time |
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*/ |
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|
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#include <linux/bitops.h> |
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#include <linux/device.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/regmap.h> |
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#include <linux/regulator/consumer.h> |
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|
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#include "bma400.h" |
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|
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/* |
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* The G-range selection may be one of 2g, 4g, 8, or 16g. The scale may |
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* be selected with the acc_range bits of the ACC_CONFIG1 register. |
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* NB: This buffer is populated in the device init. |
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*/ |
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static int bma400_scales[8]; |
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|
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/* |
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* See the ACC_CONFIG1 section of the datasheet. |
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* NB: This buffer is populated in the device init. |
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*/ |
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static int bma400_sample_freqs[14]; |
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static const int bma400_osr_range[] = { 0, 1, 3 }; |
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|
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/* See the ACC_CONFIG0 section of the datasheet */ |
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enum bma400_power_mode { |
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POWER_MODE_SLEEP = 0x00, |
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POWER_MODE_LOW = 0x01, |
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POWER_MODE_NORMAL = 0x02, |
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POWER_MODE_INVALID = 0x03, |
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}; |
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|
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struct bma400_sample_freq { |
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int hz; |
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int uhz; |
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}; |
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struct bma400_data { |
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struct device *dev; |
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struct regmap *regmap; |
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struct regulator_bulk_data regulators[BMA400_NUM_REGULATORS]; |
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struct mutex mutex; /* data register lock */ |
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struct iio_mount_matrix orientation; |
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enum bma400_power_mode power_mode; |
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struct bma400_sample_freq sample_freq; |
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int oversampling_ratio; |
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int scale; |
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}; |
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|
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static bool bma400_is_writable_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case BMA400_CHIP_ID_REG: |
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case BMA400_ERR_REG: |
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case BMA400_STATUS_REG: |
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case BMA400_X_AXIS_LSB_REG: |
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case BMA400_X_AXIS_MSB_REG: |
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case BMA400_Y_AXIS_LSB_REG: |
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case BMA400_Y_AXIS_MSB_REG: |
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case BMA400_Z_AXIS_LSB_REG: |
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case BMA400_Z_AXIS_MSB_REG: |
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case BMA400_SENSOR_TIME0: |
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case BMA400_SENSOR_TIME1: |
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case BMA400_SENSOR_TIME2: |
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case BMA400_EVENT_REG: |
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case BMA400_INT_STAT0_REG: |
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case BMA400_INT_STAT1_REG: |
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case BMA400_INT_STAT2_REG: |
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case BMA400_TEMP_DATA_REG: |
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case BMA400_FIFO_LENGTH0_REG: |
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case BMA400_FIFO_LENGTH1_REG: |
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case BMA400_FIFO_DATA_REG: |
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case BMA400_STEP_CNT0_REG: |
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case BMA400_STEP_CNT1_REG: |
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case BMA400_STEP_CNT3_REG: |
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case BMA400_STEP_STAT_REG: |
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return false; |
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default: |
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return true; |
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} |
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} |
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static bool bma400_is_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case BMA400_ERR_REG: |
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case BMA400_STATUS_REG: |
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case BMA400_X_AXIS_LSB_REG: |
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case BMA400_X_AXIS_MSB_REG: |
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case BMA400_Y_AXIS_LSB_REG: |
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case BMA400_Y_AXIS_MSB_REG: |
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case BMA400_Z_AXIS_LSB_REG: |
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case BMA400_Z_AXIS_MSB_REG: |
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case BMA400_SENSOR_TIME0: |
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case BMA400_SENSOR_TIME1: |
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case BMA400_SENSOR_TIME2: |
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case BMA400_EVENT_REG: |
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case BMA400_INT_STAT0_REG: |
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case BMA400_INT_STAT1_REG: |
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case BMA400_INT_STAT2_REG: |
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case BMA400_TEMP_DATA_REG: |
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case BMA400_FIFO_LENGTH0_REG: |
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case BMA400_FIFO_LENGTH1_REG: |
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case BMA400_FIFO_DATA_REG: |
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case BMA400_STEP_CNT0_REG: |
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case BMA400_STEP_CNT1_REG: |
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case BMA400_STEP_CNT3_REG: |
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case BMA400_STEP_STAT_REG: |
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return true; |
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default: |
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return false; |
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} |
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} |
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const struct regmap_config bma400_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = BMA400_CMD_REG, |
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.cache_type = REGCACHE_RBTREE, |
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.writeable_reg = bma400_is_writable_reg, |
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.volatile_reg = bma400_is_volatile_reg, |
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}; |
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EXPORT_SYMBOL_NS(bma400_regmap_config, IIO_BMA400); |
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|
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static const struct iio_mount_matrix * |
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bma400_accel_get_mount_matrix(const struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan) |
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{ |
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struct bma400_data *data = iio_priv(indio_dev); |
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return &data->orientation; |
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} |
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static const struct iio_chan_spec_ext_info bma400_ext_info[] = { |
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IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bma400_accel_get_mount_matrix), |
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{ } |
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}; |
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#define BMA400_ACC_CHANNEL(_axis) { \ |
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.type = IIO_ACCEL, \ |
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.modified = 1, \ |
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.channel2 = IIO_MOD_##_axis, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ |
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BIT(IIO_CHAN_INFO_SCALE) | \ |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ |
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.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ |
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BIT(IIO_CHAN_INFO_SCALE) | \ |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ |
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.ext_info = bma400_ext_info, \ |
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} |
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static const struct iio_chan_spec bma400_channels[] = { |
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BMA400_ACC_CHANNEL(X), |
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BMA400_ACC_CHANNEL(Y), |
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BMA400_ACC_CHANNEL(Z), |
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{ |
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.type = IIO_TEMP, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
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}, |
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}; |
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static int bma400_get_temp_reg(struct bma400_data *data, int *val, int *val2) |
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{ |
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unsigned int raw_temp; |
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int host_temp; |
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int ret; |
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if (data->power_mode == POWER_MODE_SLEEP) |
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return -EBUSY; |
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ret = regmap_read(data->regmap, BMA400_TEMP_DATA_REG, &raw_temp); |
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if (ret) |
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return ret; |
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host_temp = sign_extend32(raw_temp, 7); |
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/* |
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* The formula for the TEMP_DATA register in the datasheet |
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* is: x * 0.5 + 23 |
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*/ |
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*val = (host_temp >> 1) + 23; |
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*val2 = (host_temp & 0x1) * 500000; |
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return IIO_VAL_INT_PLUS_MICRO; |
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} |
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static int bma400_get_accel_reg(struct bma400_data *data, |
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const struct iio_chan_spec *chan, |
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int *val) |
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{ |
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__le16 raw_accel; |
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int lsb_reg; |
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int ret; |
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if (data->power_mode == POWER_MODE_SLEEP) |
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return -EBUSY; |
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switch (chan->channel2) { |
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case IIO_MOD_X: |
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lsb_reg = BMA400_X_AXIS_LSB_REG; |
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break; |
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case IIO_MOD_Y: |
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lsb_reg = BMA400_Y_AXIS_LSB_REG; |
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break; |
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case IIO_MOD_Z: |
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lsb_reg = BMA400_Z_AXIS_LSB_REG; |
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break; |
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default: |
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dev_err(data->dev, "invalid axis channel modifier\n"); |
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return -EINVAL; |
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} |
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/* bulk read two registers, with the base being the LSB register */ |
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ret = regmap_bulk_read(data->regmap, lsb_reg, &raw_accel, |
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sizeof(raw_accel)); |
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if (ret) |
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return ret; |
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*val = sign_extend32(le16_to_cpu(raw_accel), 11); |
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return IIO_VAL_INT; |
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} |
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static void bma400_output_data_rate_from_raw(int raw, unsigned int *val, |
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unsigned int *val2) |
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{ |
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*val = BMA400_ACC_ODR_MAX_HZ >> (BMA400_ACC_ODR_MAX_RAW - raw); |
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if (raw > BMA400_ACC_ODR_MIN_RAW) |
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*val2 = 0; |
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else |
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*val2 = 500000; |
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} |
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static int bma400_get_accel_output_data_rate(struct bma400_data *data) |
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{ |
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unsigned int val; |
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unsigned int odr; |
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int ret; |
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switch (data->power_mode) { |
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case POWER_MODE_LOW: |
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/* |
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* Runs at a fixed rate in low-power mode. See section 4.3 |
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* in the datasheet. |
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*/ |
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bma400_output_data_rate_from_raw(BMA400_ACC_ODR_LP_RAW, |
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&data->sample_freq.hz, |
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&data->sample_freq.uhz); |
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return 0; |
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case POWER_MODE_NORMAL: |
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/* |
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* In normal mode the ODR can be found in the ACC_CONFIG1 |
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* register. |
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*/ |
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ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val); |
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if (ret) |
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goto error; |
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odr = val & BMA400_ACC_ODR_MASK; |
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if (odr < BMA400_ACC_ODR_MIN_RAW || |
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odr > BMA400_ACC_ODR_MAX_RAW) { |
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ret = -EINVAL; |
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goto error; |
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} |
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bma400_output_data_rate_from_raw(odr, &data->sample_freq.hz, |
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&data->sample_freq.uhz); |
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return 0; |
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case POWER_MODE_SLEEP: |
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data->sample_freq.hz = 0; |
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data->sample_freq.uhz = 0; |
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return 0; |
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default: |
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ret = 0; |
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goto error; |
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} |
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error: |
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data->sample_freq.hz = -1; |
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data->sample_freq.uhz = -1; |
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return ret; |
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} |
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static int bma400_set_accel_output_data_rate(struct bma400_data *data, |
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int hz, int uhz) |
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{ |
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unsigned int idx; |
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unsigned int odr; |
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unsigned int val; |
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int ret; |
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if (hz >= BMA400_ACC_ODR_MIN_WHOLE_HZ) { |
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if (uhz || hz > BMA400_ACC_ODR_MAX_HZ) |
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return -EINVAL; |
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/* Note this works because MIN_WHOLE_HZ is odd */ |
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idx = __ffs(hz); |
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if (hz >> idx != BMA400_ACC_ODR_MIN_WHOLE_HZ) |
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return -EINVAL; |
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idx += BMA400_ACC_ODR_MIN_RAW + 1; |
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} else if (hz == BMA400_ACC_ODR_MIN_HZ && uhz == 500000) { |
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idx = BMA400_ACC_ODR_MIN_RAW; |
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} else { |
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return -EINVAL; |
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} |
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ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val); |
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if (ret) |
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return ret; |
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/* preserve the range and normal mode osr */ |
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odr = (~BMA400_ACC_ODR_MASK & val) | idx; |
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ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG, odr); |
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if (ret) |
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return ret; |
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bma400_output_data_rate_from_raw(idx, &data->sample_freq.hz, |
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&data->sample_freq.uhz); |
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return 0; |
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} |
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static int bma400_get_accel_oversampling_ratio(struct bma400_data *data) |
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{ |
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unsigned int val; |
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unsigned int osr; |
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int ret; |
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/* |
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* The oversampling ratio is stored in a different register |
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* based on the power-mode. In normal mode the OSR is stored |
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* in ACC_CONFIG1. In low-power mode it is stored in |
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* ACC_CONFIG0. |
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*/ |
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switch (data->power_mode) { |
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case POWER_MODE_LOW: |
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ret = regmap_read(data->regmap, BMA400_ACC_CONFIG0_REG, &val); |
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if (ret) { |
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data->oversampling_ratio = -1; |
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return ret; |
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} |
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osr = (val & BMA400_LP_OSR_MASK) >> BMA400_LP_OSR_SHIFT; |
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data->oversampling_ratio = osr; |
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return 0; |
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case POWER_MODE_NORMAL: |
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ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val); |
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if (ret) { |
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data->oversampling_ratio = -1; |
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return ret; |
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} |
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osr = (val & BMA400_NP_OSR_MASK) >> BMA400_NP_OSR_SHIFT; |
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data->oversampling_ratio = osr; |
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return 0; |
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case POWER_MODE_SLEEP: |
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data->oversampling_ratio = 0; |
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return 0; |
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default: |
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data->oversampling_ratio = -1; |
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return -EINVAL; |
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} |
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} |
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static int bma400_set_accel_oversampling_ratio(struct bma400_data *data, |
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int val) |
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{ |
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unsigned int acc_config; |
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int ret; |
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if (val & ~BMA400_TWO_BITS_MASK) |
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return -EINVAL; |
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/* |
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* The oversampling ratio is stored in a different register |
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* based on the power-mode. |
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*/ |
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switch (data->power_mode) { |
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case POWER_MODE_LOW: |
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ret = regmap_read(data->regmap, BMA400_ACC_CONFIG0_REG, |
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&acc_config); |
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if (ret) |
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return ret; |
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ret = regmap_write(data->regmap, BMA400_ACC_CONFIG0_REG, |
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(acc_config & ~BMA400_LP_OSR_MASK) | |
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(val << BMA400_LP_OSR_SHIFT)); |
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if (ret) { |
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dev_err(data->dev, "Failed to write out OSR\n"); |
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return ret; |
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} |
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data->oversampling_ratio = val; |
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return 0; |
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case POWER_MODE_NORMAL: |
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ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, |
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&acc_config); |
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if (ret) |
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return ret; |
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ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG, |
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(acc_config & ~BMA400_NP_OSR_MASK) | |
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(val << BMA400_NP_OSR_SHIFT)); |
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if (ret) { |
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dev_err(data->dev, "Failed to write out OSR\n"); |
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return ret; |
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} |
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data->oversampling_ratio = val; |
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return 0; |
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default: |
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return -EINVAL; |
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} |
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return ret; |
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} |
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static int bma400_accel_scale_to_raw(struct bma400_data *data, |
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unsigned int val) |
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{ |
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int raw; |
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if (val == 0) |
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return -EINVAL; |
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/* Note this works because BMA400_SCALE_MIN is odd */ |
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raw = __ffs(val); |
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if (val >> raw != BMA400_SCALE_MIN) |
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return -EINVAL; |
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return raw; |
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} |
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static int bma400_get_accel_scale(struct bma400_data *data) |
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{ |
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unsigned int raw_scale; |
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unsigned int val; |
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int ret; |
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ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &val); |
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if (ret) |
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return ret; |
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raw_scale = (val & BMA400_ACC_SCALE_MASK) >> BMA400_SCALE_SHIFT; |
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if (raw_scale > BMA400_TWO_BITS_MASK) |
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return -EINVAL; |
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data->scale = BMA400_SCALE_MIN << raw_scale; |
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return 0; |
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} |
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static int bma400_set_accel_scale(struct bma400_data *data, unsigned int val) |
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{ |
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unsigned int acc_config; |
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int raw; |
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int ret; |
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ret = regmap_read(data->regmap, BMA400_ACC_CONFIG1_REG, &acc_config); |
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if (ret) |
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return ret; |
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raw = bma400_accel_scale_to_raw(data, val); |
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if (raw < 0) |
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return raw; |
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ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG, |
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(acc_config & ~BMA400_ACC_SCALE_MASK) | |
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(raw << BMA400_SCALE_SHIFT)); |
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if (ret) |
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return ret; |
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data->scale = val; |
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return 0; |
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} |
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|
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static int bma400_get_power_mode(struct bma400_data *data) |
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{ |
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unsigned int val; |
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int ret; |
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|
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ret = regmap_read(data->regmap, BMA400_STATUS_REG, &val); |
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if (ret) { |
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dev_err(data->dev, "Failed to read status register\n"); |
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return ret; |
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} |
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data->power_mode = (val >> 1) & BMA400_TWO_BITS_MASK; |
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return 0; |
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} |
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|
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static int bma400_set_power_mode(struct bma400_data *data, |
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enum bma400_power_mode mode) |
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{ |
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unsigned int val; |
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int ret; |
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|
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ret = regmap_read(data->regmap, BMA400_ACC_CONFIG0_REG, &val); |
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if (ret) |
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return ret; |
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|
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if (data->power_mode == mode) |
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return 0; |
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|
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if (mode == POWER_MODE_INVALID) |
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return -EINVAL; |
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|
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/* Preserve the low-power oversample ratio etc */ |
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ret = regmap_write(data->regmap, BMA400_ACC_CONFIG0_REG, |
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mode | (val & ~BMA400_TWO_BITS_MASK)); |
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if (ret) { |
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dev_err(data->dev, "Failed to write to power-mode\n"); |
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return ret; |
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} |
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data->power_mode = mode; |
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|
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/* |
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* Update our cached osr and odr based on the new |
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* power-mode. |
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*/ |
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bma400_get_accel_output_data_rate(data); |
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bma400_get_accel_oversampling_ratio(data); |
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return 0; |
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} |
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|
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static void bma400_init_tables(void) |
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{ |
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int raw; |
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int i; |
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|
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for (i = 0; i + 1 < ARRAY_SIZE(bma400_sample_freqs); i += 2) { |
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raw = (i / 2) + 5; |
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bma400_output_data_rate_from_raw(raw, &bma400_sample_freqs[i], |
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&bma400_sample_freqs[i + 1]); |
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} |
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|
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for (i = 0; i + 1 < ARRAY_SIZE(bma400_scales); i += 2) { |
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raw = i / 2; |
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bma400_scales[i] = 0; |
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bma400_scales[i + 1] = BMA400_SCALE_MIN << raw; |
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} |
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} |
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|
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static int bma400_init(struct bma400_data *data) |
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{ |
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unsigned int val; |
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int ret; |
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|
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/* Try to read chip_id register. It must return 0x90. */ |
|
ret = regmap_read(data->regmap, BMA400_CHIP_ID_REG, &val); |
|
if (ret) { |
|
dev_err(data->dev, "Failed to read chip id register\n"); |
|
goto out; |
|
} |
|
|
|
if (val != BMA400_ID_REG_VAL) { |
|
dev_err(data->dev, "Chip ID mismatch\n"); |
|
ret = -ENODEV; |
|
goto out; |
|
} |
|
|
|
data->regulators[BMA400_VDD_REGULATOR].supply = "vdd"; |
|
data->regulators[BMA400_VDDIO_REGULATOR].supply = "vddio"; |
|
ret = devm_regulator_bulk_get(data->dev, |
|
ARRAY_SIZE(data->regulators), |
|
data->regulators); |
|
if (ret) { |
|
if (ret != -EPROBE_DEFER) |
|
dev_err(data->dev, |
|
"Failed to get regulators: %d\n", |
|
ret); |
|
|
|
goto out; |
|
} |
|
ret = regulator_bulk_enable(ARRAY_SIZE(data->regulators), |
|
data->regulators); |
|
if (ret) { |
|
dev_err(data->dev, "Failed to enable regulators: %d\n", |
|
ret); |
|
goto out; |
|
} |
|
|
|
ret = bma400_get_power_mode(data); |
|
if (ret) { |
|
dev_err(data->dev, "Failed to get the initial power-mode\n"); |
|
goto err_reg_disable; |
|
} |
|
|
|
if (data->power_mode != POWER_MODE_NORMAL) { |
|
ret = bma400_set_power_mode(data, POWER_MODE_NORMAL); |
|
if (ret) { |
|
dev_err(data->dev, "Failed to wake up the device\n"); |
|
goto err_reg_disable; |
|
} |
|
/* |
|
* TODO: The datasheet waits 1500us here in the example, but |
|
* lists 2/ODR as the wakeup time. |
|
*/ |
|
usleep_range(1500, 2000); |
|
} |
|
|
|
bma400_init_tables(); |
|
|
|
ret = bma400_get_accel_output_data_rate(data); |
|
if (ret) |
|
goto err_reg_disable; |
|
|
|
ret = bma400_get_accel_oversampling_ratio(data); |
|
if (ret) |
|
goto err_reg_disable; |
|
|
|
ret = bma400_get_accel_scale(data); |
|
if (ret) |
|
goto err_reg_disable; |
|
|
|
/* |
|
* Once the interrupt engine is supported we might use the |
|
* data_src_reg, but for now ensure this is set to the |
|
* variable ODR filter selectable by the sample frequency |
|
* channel. |
|
*/ |
|
return regmap_write(data->regmap, BMA400_ACC_CONFIG2_REG, 0x00); |
|
|
|
err_reg_disable: |
|
regulator_bulk_disable(ARRAY_SIZE(data->regulators), |
|
data->regulators); |
|
out: |
|
return ret; |
|
} |
|
|
|
static int bma400_read_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, int *val, |
|
int *val2, long mask) |
|
{ |
|
struct bma400_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_PROCESSED: |
|
mutex_lock(&data->mutex); |
|
ret = bma400_get_temp_reg(data, val, val2); |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
case IIO_CHAN_INFO_RAW: |
|
mutex_lock(&data->mutex); |
|
ret = bma400_get_accel_reg(data, chan, val); |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
switch (chan->type) { |
|
case IIO_ACCEL: |
|
if (data->sample_freq.hz < 0) |
|
return -EINVAL; |
|
|
|
*val = data->sample_freq.hz; |
|
*val2 = data->sample_freq.uhz; |
|
return IIO_VAL_INT_PLUS_MICRO; |
|
case IIO_TEMP: |
|
/* |
|
* Runs at a fixed sampling frequency. See Section 4.4 |
|
* of the datasheet. |
|
*/ |
|
*val = 6; |
|
*val2 = 250000; |
|
return IIO_VAL_INT_PLUS_MICRO; |
|
default: |
|
return -EINVAL; |
|
} |
|
case IIO_CHAN_INFO_SCALE: |
|
*val = 0; |
|
*val2 = data->scale; |
|
return IIO_VAL_INT_PLUS_MICRO; |
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
|
/* |
|
* TODO: We could avoid this logic and returning -EINVAL here if |
|
* we set both the low-power and normal mode OSR registers when |
|
* we configure the device. |
|
*/ |
|
if (data->oversampling_ratio < 0) |
|
return -EINVAL; |
|
|
|
*val = data->oversampling_ratio; |
|
return IIO_VAL_INT; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int bma400_read_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_SCALE: |
|
*type = IIO_VAL_INT_PLUS_MICRO; |
|
*vals = bma400_scales; |
|
*length = ARRAY_SIZE(bma400_scales); |
|
return IIO_AVAIL_LIST; |
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
|
*type = IIO_VAL_INT; |
|
*vals = bma400_osr_range; |
|
*length = ARRAY_SIZE(bma400_osr_range); |
|
return IIO_AVAIL_RANGE; |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
*type = IIO_VAL_INT_PLUS_MICRO; |
|
*vals = bma400_sample_freqs; |
|
*length = ARRAY_SIZE(bma400_sample_freqs); |
|
return IIO_AVAIL_LIST; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int bma400_write_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, int val, int val2, |
|
long mask) |
|
{ |
|
struct bma400_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
/* |
|
* The sample frequency is readonly for the temperature |
|
* register and a fixed value in low-power mode. |
|
*/ |
|
if (chan->type != IIO_ACCEL) |
|
return -EINVAL; |
|
|
|
mutex_lock(&data->mutex); |
|
ret = bma400_set_accel_output_data_rate(data, val, val2); |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
case IIO_CHAN_INFO_SCALE: |
|
if (val != 0 || |
|
val2 < BMA400_SCALE_MIN || val2 > BMA400_SCALE_MAX) |
|
return -EINVAL; |
|
|
|
mutex_lock(&data->mutex); |
|
ret = bma400_set_accel_scale(data, val2); |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
|
mutex_lock(&data->mutex); |
|
ret = bma400_set_accel_oversampling_ratio(data, val); |
|
mutex_unlock(&data->mutex); |
|
return ret; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int bma400_write_raw_get_fmt(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
long mask) |
|
{ |
|
switch (mask) { |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
return IIO_VAL_INT_PLUS_MICRO; |
|
case IIO_CHAN_INFO_SCALE: |
|
return IIO_VAL_INT_PLUS_MICRO; |
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
|
return IIO_VAL_INT; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static const struct iio_info bma400_info = { |
|
.read_raw = bma400_read_raw, |
|
.read_avail = bma400_read_avail, |
|
.write_raw = bma400_write_raw, |
|
.write_raw_get_fmt = bma400_write_raw_get_fmt, |
|
}; |
|
|
|
int bma400_probe(struct device *dev, struct regmap *regmap, const char *name) |
|
{ |
|
struct iio_dev *indio_dev; |
|
struct bma400_data *data; |
|
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->dev = dev; |
|
|
|
ret = bma400_init(data); |
|
if (ret) |
|
return ret; |
|
|
|
ret = iio_read_mount_matrix(dev, &data->orientation); |
|
if (ret) |
|
return ret; |
|
|
|
mutex_init(&data->mutex); |
|
indio_dev->name = name; |
|
indio_dev->info = &bma400_info; |
|
indio_dev->channels = bma400_channels; |
|
indio_dev->num_channels = ARRAY_SIZE(bma400_channels); |
|
indio_dev->modes = INDIO_DIRECT_MODE; |
|
|
|
dev_set_drvdata(dev, indio_dev); |
|
|
|
return iio_device_register(indio_dev); |
|
} |
|
EXPORT_SYMBOL_NS(bma400_probe, IIO_BMA400); |
|
|
|
void bma400_remove(struct device *dev) |
|
{ |
|
struct iio_dev *indio_dev = dev_get_drvdata(dev); |
|
struct bma400_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
mutex_lock(&data->mutex); |
|
ret = bma400_set_power_mode(data, POWER_MODE_SLEEP); |
|
mutex_unlock(&data->mutex); |
|
|
|
if (ret) |
|
dev_warn(dev, "Failed to put device into sleep mode (%pe)\n", ERR_PTR(ret)); |
|
|
|
regulator_bulk_disable(ARRAY_SIZE(data->regulators), |
|
data->regulators); |
|
|
|
iio_device_unregister(indio_dev); |
|
} |
|
EXPORT_SYMBOL_NS(bma400_remove, IIO_BMA400); |
|
|
|
MODULE_AUTHOR("Dan Robertson <[email protected]>"); |
|
MODULE_DESCRIPTION("Bosch BMA400 triaxial acceleration sensor core"); |
|
MODULE_LICENSE("GPL");
|
|
|