716 строки
20 KiB
C
716 строки
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* FXOS8700 - NXP IMU (accelerometer plus magnetometer)
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*
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* IIO core driver for FXOS8700, with support for I2C/SPI busses
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*
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* TODO: Buffer, trigger, and IRQ support
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*/
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/acpi.h>
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#include <linux/bitops.h>
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#include <linux/bitfield.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include "fxos8700.h"
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/* Register Definitions */
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#define FXOS8700_STATUS 0x00
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#define FXOS8700_OUT_X_MSB 0x01
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#define FXOS8700_OUT_X_LSB 0x02
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#define FXOS8700_OUT_Y_MSB 0x03
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#define FXOS8700_OUT_Y_LSB 0x04
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#define FXOS8700_OUT_Z_MSB 0x05
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#define FXOS8700_OUT_Z_LSB 0x06
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#define FXOS8700_F_SETUP 0x09
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#define FXOS8700_TRIG_CFG 0x0a
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#define FXOS8700_SYSMOD 0x0b
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#define FXOS8700_INT_SOURCE 0x0c
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#define FXOS8700_WHO_AM_I 0x0d
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#define FXOS8700_XYZ_DATA_CFG 0x0e
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#define FXOS8700_HP_FILTER_CUTOFF 0x0f
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#define FXOS8700_PL_STATUS 0x10
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#define FXOS8700_PL_CFG 0x11
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#define FXOS8700_PL_COUNT 0x12
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#define FXOS8700_PL_BF_ZCOMP 0x13
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#define FXOS8700_PL_THS_REG 0x14
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#define FXOS8700_A_FFMT_CFG 0x15
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#define FXOS8700_A_FFMT_SRC 0x16
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#define FXOS8700_A_FFMT_THS 0x17
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#define FXOS8700_A_FFMT_COUNT 0x18
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#define FXOS8700_TRANSIENT_CFG 0x1d
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#define FXOS8700_TRANSIENT_SRC 0x1e
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#define FXOS8700_TRANSIENT_THS 0x1f
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#define FXOS8700_TRANSIENT_COUNT 0x20
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#define FXOS8700_PULSE_CFG 0x21
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#define FXOS8700_PULSE_SRC 0x22
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#define FXOS8700_PULSE_THSX 0x23
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#define FXOS8700_PULSE_THSY 0x24
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#define FXOS8700_PULSE_THSZ 0x25
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#define FXOS8700_PULSE_TMLT 0x26
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#define FXOS8700_PULSE_LTCY 0x27
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#define FXOS8700_PULSE_WIND 0x28
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#define FXOS8700_ASLP_COUNT 0x29
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#define FXOS8700_CTRL_REG1 0x2a
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#define FXOS8700_CTRL_REG2 0x2b
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#define FXOS8700_CTRL_REG3 0x2c
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#define FXOS8700_CTRL_REG4 0x2d
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#define FXOS8700_CTRL_REG5 0x2e
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#define FXOS8700_OFF_X 0x2f
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#define FXOS8700_OFF_Y 0x30
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#define FXOS8700_OFF_Z 0x31
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#define FXOS8700_M_DR_STATUS 0x32
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#define FXOS8700_M_OUT_X_MSB 0x33
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#define FXOS8700_M_OUT_X_LSB 0x34
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#define FXOS8700_M_OUT_Y_MSB 0x35
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#define FXOS8700_M_OUT_Y_LSB 0x36
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#define FXOS8700_M_OUT_Z_MSB 0x37
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#define FXOS8700_M_OUT_Z_LSB 0x38
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#define FXOS8700_CMP_X_MSB 0x39
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#define FXOS8700_CMP_X_LSB 0x3a
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#define FXOS8700_CMP_Y_MSB 0x3b
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#define FXOS8700_CMP_Y_LSB 0x3c
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#define FXOS8700_CMP_Z_MSB 0x3d
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#define FXOS8700_CMP_Z_LSB 0x3e
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#define FXOS8700_M_OFF_X_MSB 0x3f
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#define FXOS8700_M_OFF_X_LSB 0x40
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#define FXOS8700_M_OFF_Y_MSB 0x41
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#define FXOS8700_M_OFF_Y_LSB 0x42
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#define FXOS8700_M_OFF_Z_MSB 0x43
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#define FXOS8700_M_OFF_Z_LSB 0x44
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#define FXOS8700_MAX_X_MSB 0x45
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#define FXOS8700_MAX_X_LSB 0x46
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#define FXOS8700_MAX_Y_MSB 0x47
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#define FXOS8700_MAX_Y_LSB 0x48
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#define FXOS8700_MAX_Z_MSB 0x49
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#define FXOS8700_MAX_Z_LSB 0x4a
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#define FXOS8700_MIN_X_MSB 0x4b
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#define FXOS8700_MIN_X_LSB 0x4c
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#define FXOS8700_MIN_Y_MSB 0x4d
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#define FXOS8700_MIN_Y_LSB 0x4e
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#define FXOS8700_MIN_Z_MSB 0x4f
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#define FXOS8700_MIN_Z_LSB 0x50
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#define FXOS8700_TEMP 0x51
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#define FXOS8700_M_THS_CFG 0x52
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#define FXOS8700_M_THS_SRC 0x53
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#define FXOS8700_M_THS_X_MSB 0x54
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#define FXOS8700_M_THS_X_LSB 0x55
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#define FXOS8700_M_THS_Y_MSB 0x56
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#define FXOS8700_M_THS_Y_LSB 0x57
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#define FXOS8700_M_THS_Z_MSB 0x58
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#define FXOS8700_M_THS_Z_LSB 0x59
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#define FXOS8700_M_THS_COUNT 0x5a
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#define FXOS8700_M_CTRL_REG1 0x5b
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#define FXOS8700_M_CTRL_REG2 0x5c
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#define FXOS8700_M_CTRL_REG3 0x5d
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#define FXOS8700_M_INT_SRC 0x5e
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#define FXOS8700_A_VECM_CFG 0x5f
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#define FXOS8700_A_VECM_THS_MSB 0x60
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#define FXOS8700_A_VECM_THS_LSB 0x61
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#define FXOS8700_A_VECM_CNT 0x62
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#define FXOS8700_A_VECM_INITX_MSB 0x63
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#define FXOS8700_A_VECM_INITX_LSB 0x64
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#define FXOS8700_A_VECM_INITY_MSB 0x65
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#define FXOS8700_A_VECM_INITY_LSB 0x66
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#define FXOS8700_A_VECM_INITZ_MSB 0x67
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#define FXOS8700_A_VECM_INITZ_LSB 0x68
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#define FXOS8700_M_VECM_CFG 0x69
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#define FXOS8700_M_VECM_THS_MSB 0x6a
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#define FXOS8700_M_VECM_THS_LSB 0x6b
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#define FXOS8700_M_VECM_CNT 0x6c
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#define FXOS8700_M_VECM_INITX_MSB 0x6d
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#define FXOS8700_M_VECM_INITX_LSB 0x6e
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#define FXOS8700_M_VECM_INITY_MSB 0x6f
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#define FXOS8700_M_VECM_INITY_LSB 0x70
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#define FXOS8700_M_VECM_INITZ_MSB 0x71
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#define FXOS8700_M_VECM_INITZ_LSB 0x72
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#define FXOS8700_A_FFMT_THS_X_MSB 0x73
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#define FXOS8700_A_FFMT_THS_X_LSB 0x74
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#define FXOS8700_A_FFMT_THS_Y_MSB 0x75
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#define FXOS8700_A_FFMT_THS_Y_LSB 0x76
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#define FXOS8700_A_FFMT_THS_Z_MSB 0x77
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#define FXOS8700_A_FFMT_THS_Z_LSB 0x78
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#define FXOS8700_A_TRAN_INIT_MSB 0x79
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#define FXOS8700_A_TRAN_INIT_LSB_X 0x7a
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#define FXOS8700_A_TRAN_INIT_LSB_Y 0x7b
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#define FXOS8700_A_TRAN_INIT_LSB_Z 0x7d
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#define FXOS8700_TM_NVM_LOCK 0x7e
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#define FXOS8700_NVM_DATA0_35 0x80
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#define FXOS8700_NVM_DATA_BNK3 0xa4
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#define FXOS8700_NVM_DATA_BNK2 0xa5
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#define FXOS8700_NVM_DATA_BNK1 0xa6
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#define FXOS8700_NVM_DATA_BNK0 0xa7
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/* Bit definitions for FXOS8700_CTRL_REG1 */
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#define FXOS8700_CTRL_ODR_MAX 0x00
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#define FXOS8700_CTRL_ODR_MSK GENMASK(5, 3)
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/* Bit definitions for FXOS8700_M_CTRL_REG1 */
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#define FXOS8700_HMS_MASK GENMASK(1, 0)
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#define FXOS8700_OS_MASK GENMASK(4, 2)
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/* Bit definitions for FXOS8700_M_CTRL_REG2 */
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#define FXOS8700_MAXMIN_RST BIT(2)
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#define FXOS8700_MAXMIN_DIS_THS BIT(3)
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#define FXOS8700_MAXMIN_DIS BIT(4)
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#define FXOS8700_ACTIVE 0x01
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#define FXOS8700_ACTIVE_MIN_USLEEP 4000 /* from table 6 in datasheet */
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#define FXOS8700_DEVICE_ID 0xC7
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#define FXOS8700_PRE_DEVICE_ID 0xC4
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#define FXOS8700_DATA_BUF_SIZE 3
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struct fxos8700_data {
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struct regmap *regmap;
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struct iio_trigger *trig;
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__be16 buf[FXOS8700_DATA_BUF_SIZE] __aligned(IIO_DMA_MINALIGN);
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};
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/* Regmap info */
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static const struct regmap_range read_range[] = {
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{
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.range_min = FXOS8700_STATUS,
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.range_max = FXOS8700_A_FFMT_COUNT,
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}, {
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.range_min = FXOS8700_TRANSIENT_CFG,
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.range_max = FXOS8700_A_FFMT_THS_Z_LSB,
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},
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};
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static const struct regmap_range write_range[] = {
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{
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.range_min = FXOS8700_F_SETUP,
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.range_max = FXOS8700_TRIG_CFG,
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}, {
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.range_min = FXOS8700_XYZ_DATA_CFG,
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.range_max = FXOS8700_HP_FILTER_CUTOFF,
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}, {
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.range_min = FXOS8700_PL_CFG,
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.range_max = FXOS8700_A_FFMT_CFG,
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}, {
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.range_min = FXOS8700_A_FFMT_THS,
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.range_max = FXOS8700_TRANSIENT_CFG,
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}, {
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.range_min = FXOS8700_TRANSIENT_THS,
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.range_max = FXOS8700_PULSE_CFG,
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}, {
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.range_min = FXOS8700_PULSE_THSX,
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.range_max = FXOS8700_OFF_Z,
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}, {
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.range_min = FXOS8700_M_OFF_X_MSB,
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.range_max = FXOS8700_M_OFF_Z_LSB,
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}, {
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.range_min = FXOS8700_M_THS_CFG,
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.range_max = FXOS8700_M_THS_CFG,
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}, {
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.range_min = FXOS8700_M_THS_X_MSB,
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.range_max = FXOS8700_M_CTRL_REG3,
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}, {
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.range_min = FXOS8700_A_VECM_CFG,
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.range_max = FXOS8700_A_FFMT_THS_Z_LSB,
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},
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};
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static const struct regmap_access_table driver_read_table = {
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.yes_ranges = read_range,
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.n_yes_ranges = ARRAY_SIZE(read_range),
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};
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static const struct regmap_access_table driver_write_table = {
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.yes_ranges = write_range,
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.n_yes_ranges = ARRAY_SIZE(write_range),
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};
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const struct regmap_config fxos8700_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = FXOS8700_NVM_DATA_BNK0,
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.rd_table = &driver_read_table,
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.wr_table = &driver_write_table,
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};
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EXPORT_SYMBOL(fxos8700_regmap_config);
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#define FXOS8700_CHANNEL(_type, _axis) { \
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.type = _type, \
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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_SCALE) | \
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BIT(IIO_CHAN_INFO_SAMP_FREQ), \
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}
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enum fxos8700_accel_scale_bits {
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MODE_2G = 0,
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MODE_4G,
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MODE_8G,
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};
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/* scan indexes follow DATA register order */
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enum fxos8700_scan_axis {
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FXOS8700_SCAN_ACCEL_X = 0,
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FXOS8700_SCAN_ACCEL_Y,
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FXOS8700_SCAN_ACCEL_Z,
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FXOS8700_SCAN_MAGN_X,
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FXOS8700_SCAN_MAGN_Y,
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FXOS8700_SCAN_MAGN_Z,
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FXOS8700_SCAN_RHALL,
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FXOS8700_SCAN_TIMESTAMP,
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};
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enum fxos8700_sensor {
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FXOS8700_ACCEL = 0,
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FXOS8700_MAGN,
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FXOS8700_NUM_SENSORS /* must be last */
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};
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enum fxos8700_int_pin {
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FXOS8700_PIN_INT1,
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FXOS8700_PIN_INT2
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};
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struct fxos8700_scale {
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u8 bits;
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int uscale;
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};
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struct fxos8700_odr {
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u8 bits;
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int odr;
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int uodr;
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};
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static const struct fxos8700_scale fxos8700_accel_scale[] = {
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{ MODE_2G, 244},
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{ MODE_4G, 488},
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{ MODE_8G, 976},
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};
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/*
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* Accellerometer and magnetometer have the same ODR options, set in the
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* CTRL_REG1 register. ODR is halved when using both sensors at once in
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* hybrid mode.
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*/
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static const struct fxos8700_odr fxos8700_odr[] = {
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{0x00, 800, 0},
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{0x01, 400, 0},
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{0x02, 200, 0},
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{0x03, 100, 0},
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{0x04, 50, 0},
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{0x05, 12, 500000},
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{0x06, 6, 250000},
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{0x07, 1, 562500},
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};
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static const struct iio_chan_spec fxos8700_channels[] = {
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FXOS8700_CHANNEL(IIO_ACCEL, X),
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FXOS8700_CHANNEL(IIO_ACCEL, Y),
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FXOS8700_CHANNEL(IIO_ACCEL, Z),
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FXOS8700_CHANNEL(IIO_MAGN, X),
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FXOS8700_CHANNEL(IIO_MAGN, Y),
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FXOS8700_CHANNEL(IIO_MAGN, Z),
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IIO_CHAN_SOFT_TIMESTAMP(FXOS8700_SCAN_TIMESTAMP),
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};
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static enum fxos8700_sensor fxos8700_to_sensor(enum iio_chan_type iio_type)
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{
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switch (iio_type) {
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case IIO_ACCEL:
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return FXOS8700_ACCEL;
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case IIO_MAGN:
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return FXOS8700_MAGN;
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default:
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return -EINVAL;
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}
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}
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static int fxos8700_set_active_mode(struct fxos8700_data *data,
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enum fxos8700_sensor t, bool mode)
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{
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int ret;
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ret = regmap_write(data->regmap, FXOS8700_CTRL_REG1, mode);
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if (ret)
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return ret;
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usleep_range(FXOS8700_ACTIVE_MIN_USLEEP,
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FXOS8700_ACTIVE_MIN_USLEEP + 1000);
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return 0;
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}
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static int fxos8700_set_scale(struct fxos8700_data *data,
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enum fxos8700_sensor t, int uscale)
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{
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int i, ret, val;
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bool active_mode;
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static const int scale_num = ARRAY_SIZE(fxos8700_accel_scale);
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struct device *dev = regmap_get_device(data->regmap);
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if (t == FXOS8700_MAGN) {
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dev_err(dev, "Magnetometer scale is locked at 0.001Gs\n");
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return -EINVAL;
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}
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/*
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* When device is in active mode, it failed to set an ACCEL
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* full-scale range(2g/4g/8g) in FXOS8700_XYZ_DATA_CFG.
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* This is not align with the datasheet, but it is a fxos8700
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* chip behavier. Set the device in standby mode before setting
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* an ACCEL full-scale range.
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*/
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ret = regmap_read(data->regmap, FXOS8700_CTRL_REG1, &val);
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if (ret)
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return ret;
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active_mode = val & FXOS8700_ACTIVE;
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if (active_mode) {
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ret = regmap_write(data->regmap, FXOS8700_CTRL_REG1,
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val & ~FXOS8700_ACTIVE);
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if (ret)
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return ret;
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}
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for (i = 0; i < scale_num; i++)
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if (fxos8700_accel_scale[i].uscale == uscale)
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break;
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if (i == scale_num)
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return -EINVAL;
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ret = regmap_write(data->regmap, FXOS8700_XYZ_DATA_CFG,
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fxos8700_accel_scale[i].bits);
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if (ret)
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return ret;
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return regmap_write(data->regmap, FXOS8700_CTRL_REG1,
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active_mode);
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}
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static int fxos8700_get_scale(struct fxos8700_data *data,
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enum fxos8700_sensor t, int *uscale)
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{
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int i, ret, val;
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static const int scale_num = ARRAY_SIZE(fxos8700_accel_scale);
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if (t == FXOS8700_MAGN) {
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*uscale = 1000; /* Magnetometer is locked at 0.001Gs */
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return 0;
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}
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ret = regmap_read(data->regmap, FXOS8700_XYZ_DATA_CFG, &val);
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if (ret)
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return ret;
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for (i = 0; i < scale_num; i++) {
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if (fxos8700_accel_scale[i].bits == (val & 0x3)) {
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*uscale = fxos8700_accel_scale[i].uscale;
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return 0;
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}
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}
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return -EINVAL;
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}
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static int fxos8700_get_data(struct fxos8700_data *data, int chan_type,
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int axis, int *val)
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{
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u8 base, reg;
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s16 tmp;
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int ret;
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|
/*
|
|
* Different register base addresses varies with channel types.
|
|
* This bug hasn't been noticed before because using an enum is
|
|
* really hard to read. Use an a switch statement to take over that.
|
|
*/
|
|
switch (chan_type) {
|
|
case IIO_ACCEL:
|
|
base = FXOS8700_OUT_X_MSB;
|
|
break;
|
|
case IIO_MAGN:
|
|
base = FXOS8700_M_OUT_X_MSB;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Block read 6 bytes of device output registers to avoid data loss */
|
|
ret = regmap_bulk_read(data->regmap, base, data->buf,
|
|
sizeof(data->buf));
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Convert axis to buffer index */
|
|
reg = axis - IIO_MOD_X;
|
|
|
|
/*
|
|
* Convert to native endianness. The accel data and magn data
|
|
* are signed, so a forced type conversion is needed.
|
|
*/
|
|
tmp = be16_to_cpu(data->buf[reg]);
|
|
|
|
/*
|
|
* ACCEL output data registers contain the X-axis, Y-axis, and Z-axis
|
|
* 14-bit left-justified sample data and MAGN output data registers
|
|
* contain the X-axis, Y-axis, and Z-axis 16-bit sample data. Apply
|
|
* a signed 2 bits right shift to the readback raw data from ACCEL
|
|
* output data register and keep that from MAGN sensor as the origin.
|
|
* Value should be extended to 32 bit.
|
|
*/
|
|
switch (chan_type) {
|
|
case IIO_ACCEL:
|
|
tmp = tmp >> 2;
|
|
break;
|
|
case IIO_MAGN:
|
|
/* Nothing to do */
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Convert to native endianness */
|
|
*val = sign_extend32(tmp, 15);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fxos8700_set_odr(struct fxos8700_data *data, enum fxos8700_sensor t,
|
|
int odr, int uodr)
|
|
{
|
|
int i, ret, val;
|
|
bool active_mode;
|
|
static const int odr_num = ARRAY_SIZE(fxos8700_odr);
|
|
|
|
ret = regmap_read(data->regmap, FXOS8700_CTRL_REG1, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
active_mode = val & FXOS8700_ACTIVE;
|
|
|
|
if (active_mode) {
|
|
/*
|
|
* The device must be in standby mode to change any of the
|
|
* other fields within CTRL_REG1
|
|
*/
|
|
ret = regmap_write(data->regmap, FXOS8700_CTRL_REG1,
|
|
val & ~FXOS8700_ACTIVE);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
for (i = 0; i < odr_num; i++)
|
|
if (fxos8700_odr[i].odr == odr && fxos8700_odr[i].uodr == uodr)
|
|
break;
|
|
|
|
if (i >= odr_num)
|
|
return -EINVAL;
|
|
|
|
val &= ~FXOS8700_CTRL_ODR_MSK;
|
|
val |= FIELD_PREP(FXOS8700_CTRL_ODR_MSK, fxos8700_odr[i].bits) | FXOS8700_ACTIVE;
|
|
return regmap_write(data->regmap, FXOS8700_CTRL_REG1, val);
|
|
}
|
|
|
|
static int fxos8700_get_odr(struct fxos8700_data *data, enum fxos8700_sensor t,
|
|
int *odr, int *uodr)
|
|
{
|
|
int i, val, ret;
|
|
static const int odr_num = ARRAY_SIZE(fxos8700_odr);
|
|
|
|
ret = regmap_read(data->regmap, FXOS8700_CTRL_REG1, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val = FIELD_GET(FXOS8700_CTRL_ODR_MSK, val);
|
|
|
|
for (i = 0; i < odr_num; i++)
|
|
if (val == fxos8700_odr[i].bits)
|
|
break;
|
|
|
|
if (i >= odr_num)
|
|
return -EINVAL;
|
|
|
|
*odr = fxos8700_odr[i].odr;
|
|
*uodr = fxos8700_odr[i].uodr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fxos8700_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
int ret;
|
|
struct fxos8700_data *data = iio_priv(indio_dev);
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = fxos8700_get_data(data, chan->type, chan->channel2, val);
|
|
if (ret)
|
|
return ret;
|
|
return IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
*val = 0;
|
|
ret = fxos8700_get_scale(data, fxos8700_to_sensor(chan->type),
|
|
val2);
|
|
return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
ret = fxos8700_get_odr(data, fxos8700_to_sensor(chan->type),
|
|
val, val2);
|
|
return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int fxos8700_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct fxos8700_data *data = iio_priv(indio_dev);
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_SCALE:
|
|
return fxos8700_set_scale(data, fxos8700_to_sensor(chan->type),
|
|
val2);
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
return fxos8700_set_odr(data, fxos8700_to_sensor(chan->type),
|
|
val, val2);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static IIO_CONST_ATTR(in_accel_sampling_frequency_available,
|
|
"1.5625 6.25 12.5 50 100 200 400 800");
|
|
static IIO_CONST_ATTR(in_magn_sampling_frequency_available,
|
|
"1.5625 6.25 12.5 50 100 200 400 800");
|
|
static IIO_CONST_ATTR(in_accel_scale_available, "0.000244 0.000488 0.000976");
|
|
static IIO_CONST_ATTR(in_magn_scale_available, "0.001000");
|
|
|
|
static struct attribute *fxos8700_attrs[] = {
|
|
&iio_const_attr_in_accel_sampling_frequency_available.dev_attr.attr,
|
|
&iio_const_attr_in_magn_sampling_frequency_available.dev_attr.attr,
|
|
&iio_const_attr_in_accel_scale_available.dev_attr.attr,
|
|
&iio_const_attr_in_magn_scale_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group fxos8700_attrs_group = {
|
|
.attrs = fxos8700_attrs,
|
|
};
|
|
|
|
static const struct iio_info fxos8700_info = {
|
|
.read_raw = fxos8700_read_raw,
|
|
.write_raw = fxos8700_write_raw,
|
|
.attrs = &fxos8700_attrs_group,
|
|
};
|
|
|
|
static int fxos8700_chip_init(struct fxos8700_data *data, bool use_spi)
|
|
{
|
|
int ret;
|
|
unsigned int val;
|
|
struct device *dev = regmap_get_device(data->regmap);
|
|
|
|
ret = regmap_read(data->regmap, FXOS8700_WHO_AM_I, &val);
|
|
if (ret) {
|
|
dev_err(dev, "Error reading chip id\n");
|
|
return ret;
|
|
}
|
|
if (val != FXOS8700_DEVICE_ID && val != FXOS8700_PRE_DEVICE_ID) {
|
|
dev_err(dev, "Wrong chip id, got %x expected %x or %x\n",
|
|
val, FXOS8700_DEVICE_ID, FXOS8700_PRE_DEVICE_ID);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = fxos8700_set_active_mode(data, FXOS8700_ACCEL, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = fxos8700_set_active_mode(data, FXOS8700_MAGN, true);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* The device must be in standby mode to change any of the other fields
|
|
* within CTRL_REG1
|
|
*/
|
|
ret = regmap_write(data->regmap, FXOS8700_CTRL_REG1, 0x00);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Set max oversample ratio (OSR) and both devices active */
|
|
ret = regmap_write(data->regmap, FXOS8700_M_CTRL_REG1,
|
|
FXOS8700_HMS_MASK | FXOS8700_OS_MASK);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Disable and rst min/max measurements & threshold */
|
|
ret = regmap_write(data->regmap, FXOS8700_M_CTRL_REG2,
|
|
FXOS8700_MAXMIN_RST | FXOS8700_MAXMIN_DIS_THS |
|
|
FXOS8700_MAXMIN_DIS);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Set max full-scale range (+/-8G) for ACCEL sensor in chip
|
|
* initialization then activate the device.
|
|
*/
|
|
ret = regmap_write(data->regmap, FXOS8700_XYZ_DATA_CFG, MODE_8G);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Max ODR (800Hz individual or 400Hz hybrid), active mode */
|
|
return regmap_update_bits(data->regmap, FXOS8700_CTRL_REG1,
|
|
FXOS8700_CTRL_ODR_MSK | FXOS8700_ACTIVE,
|
|
FIELD_PREP(FXOS8700_CTRL_ODR_MSK, FXOS8700_CTRL_ODR_MAX) |
|
|
FXOS8700_ACTIVE);
|
|
}
|
|
|
|
static void fxos8700_chip_uninit(void *data)
|
|
{
|
|
struct fxos8700_data *fxos8700_data = data;
|
|
|
|
fxos8700_set_active_mode(fxos8700_data, FXOS8700_ACCEL, false);
|
|
fxos8700_set_active_mode(fxos8700_data, FXOS8700_MAGN, false);
|
|
}
|
|
|
|
int fxos8700_core_probe(struct device *dev, struct regmap *regmap,
|
|
const char *name, bool use_spi)
|
|
{
|
|
struct iio_dev *indio_dev;
|
|
struct fxos8700_data *data;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
data = iio_priv(indio_dev);
|
|
dev_set_drvdata(dev, indio_dev);
|
|
data->regmap = regmap;
|
|
|
|
ret = fxos8700_chip_init(data, use_spi);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = devm_add_action_or_reset(dev, fxos8700_chip_uninit, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
indio_dev->channels = fxos8700_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(fxos8700_channels);
|
|
indio_dev->name = name ? name : "fxos8700";
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->info = &fxos8700_info;
|
|
|
|
return devm_iio_device_register(dev, indio_dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fxos8700_core_probe);
|
|
|
|
MODULE_AUTHOR("Robert Jones <rjones@gateworks.com>");
|
|
MODULE_DESCRIPTION("FXOS8700 6-Axis Acc and Mag Combo Sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|