418 lines
11 KiB
C
418 lines
11 KiB
C
/*
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* Copyright (c) 2018 STMicroelectronics
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <device.h>
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#include <drivers/i2c.h>
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#include <sys/__assert.h>
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#include <sys/util.h>
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#include <kernel.h>
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#include <drivers/sensor.h>
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#include <logging/log.h>
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#include "lsm6dsl.h"
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LOG_MODULE_DECLARE(LSM6DSL, CONFIG_SENSOR_LOG_LEVEL);
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#define LSM6DSL_EMBEDDED_SLV0_ADDR 0x02
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#define LSM6DSL_EMBEDDED_SLV0_SUBADDR 0x03
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#define LSM6DSL_EMBEDDED_SLV0_CONFIG 0x04
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#define LSM6DSL_EMBEDDED_SLV1_ADDR 0x05
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#define LSM6DSL_EMBEDDED_SLV1_SUBADDR 0x06
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#define LSM6DSL_EMBEDDED_SLV1_CONFIG 0x07
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#define LSM6DSL_EMBEDDED_SLV2_ADDR 0x08
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#define LSM6DSL_EMBEDDED_SLV2_SUBADDR 0x09
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#define LSM6DSL_EMBEDDED_SLV2_CONFIG 0x0A
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#define LSM6DSL_EMBEDDED_SLV3_ADDR 0x0B
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#define LSM6DSL_EMBEDDED_SLV3_SUBADDR 0x0C
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#define LSM6DSL_EMBEDDED_SLV3_CONFIG 0x0D
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#define LSM6DSL_EMBEDDED_SLV0_DATAWRITE 0x0E
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#define LSM6DSL_EMBEDDED_SLVX_READ 0x1
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#define LSM6DSL_EMBEDDED_SLVX_THREE_SENS 0x20
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#define LSM6DSL_EMBEDDED_SLV0_WRITE_IDLE 0x07
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static int lsm6dsl_shub_write_slave_reg(struct lsm6dsl_data *data,
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uint8_t slv_addr, uint8_t slv_reg,
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uint8_t *value, uint16_t len);
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/*
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* LIS2MDL magn device specific part
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*/
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#ifdef CONFIG_LSM6DSL_EXT0_LIS2MDL
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#define LIS2MDL_CFG_REG_A 0x60
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#define LIS2MDL_CFG_REG_B 0x61
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#define LIS2MDL_CFG_REG_C 0x62
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#define LIS2MDL_STATUS_REG 0x67
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#define LIS2MDL_SW_RESET 0x20
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#define LIS2MDL_ODR_10HZ 0x00
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#define LIS2MDL_OFF_CANC 0x02
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#define LIS2MDL_SENSITIVITY 1500
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static int lsm6dsl_lis2mdl_init(struct lsm6dsl_data *data, uint8_t i2c_addr)
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{
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uint8_t mag_cfg[2];
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data->magn_sensitivity = LIS2MDL_SENSITIVITY;
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/* sw reset device */
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mag_cfg[0] = LIS2MDL_SW_RESET;
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lsm6dsl_shub_write_slave_reg(data, i2c_addr,
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LIS2MDL_CFG_REG_A, mag_cfg, 1);
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k_sleep(K_MSEC(10)); /* turn-on time in ms */
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/* configure mag */
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mag_cfg[0] = LIS2MDL_ODR_10HZ;
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mag_cfg[1] = LIS2MDL_OFF_CANC;
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lsm6dsl_shub_write_slave_reg(data, i2c_addr,
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LIS2MDL_CFG_REG_A, mag_cfg, 2);
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return 0;
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}
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#endif /* CONFIG_LSM6DSL_EXT0_LIS2MDL */
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/*
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* LPS22HB baro/temp device specific part
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*/
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#ifdef CONFIG_LSM6DSL_EXT0_LPS22HB
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#define LPS22HB_CTRL_REG1 0x10
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#define LPS22HB_CTRL_REG2 0x11
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#define LPS22HB_SW_RESET 0x04
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#define LPS22HB_ODR_10HZ 0x20
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#define LPS22HB_LPF_EN 0x08
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#define LPS22HB_BDU_EN 0x02
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static int lsm6dsl_lps22hb_init(struct lsm6dsl_data *data, uint8_t i2c_addr)
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{
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uint8_t baro_cfg[2];
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/* sw reset device */
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baro_cfg[0] = LPS22HB_SW_RESET;
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lsm6dsl_shub_write_slave_reg(data, i2c_addr,
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LPS22HB_CTRL_REG2, baro_cfg, 1);
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k_sleep(K_MSEC(1)); /* turn-on time in ms */
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/* configure device */
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baro_cfg[0] = LPS22HB_ODR_10HZ | LPS22HB_LPF_EN | LPS22HB_BDU_EN;
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lsm6dsl_shub_write_slave_reg(data, i2c_addr,
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LPS22HB_CTRL_REG1, baro_cfg, 1);
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return 0;
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}
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#endif /* CONFIG_LSM6DSL_EXT0_LPS22HB */
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/* List of supported external sensors */
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static struct lsm6dsl_shub_sens_list {
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uint8_t i2c_addr[2];
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uint8_t wai_addr;
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uint8_t wai_val;
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uint8_t out_data_addr;
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uint8_t out_data_len;
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int (*dev_init)(struct lsm6dsl_data *data, uint8_t i2c_addr);
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} lsm6dsl_shub_sens_list[] = {
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#ifdef CONFIG_LSM6DSL_EXT0_LIS2MDL
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{
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/* LIS2MDL */
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.i2c_addr = { 0x1E },
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.wai_addr = 0x4F,
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.wai_val = 0x40,
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.out_data_addr = 0x68,
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.out_data_len = 0x06,
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.dev_init = (lsm6dsl_lis2mdl_init),
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},
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#endif /* CONFIG_LSM6DSL_EXT0_LIS2MDL */
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#ifdef CONFIG_LSM6DSL_EXT0_LPS22HB
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{
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/* LPS22HB */
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.i2c_addr = { 0x5C, 0x5D },
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.wai_addr = 0x0F,
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.wai_val = 0xB1,
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.out_data_addr = 0x28,
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.out_data_len = 0x05,
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.dev_init = (lsm6dsl_lps22hb_init),
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},
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#endif /* CONFIG_LSM6DSL_EXT0_LPS22HB */
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};
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static uint8_t ext_i2c_addr;
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static inline void lsm6dsl_shub_wait_completed(struct lsm6dsl_data *data)
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{
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uint16_t freq;
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freq = (data->accel_freq == 0U) ? 26 : data->accel_freq;
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k_msleep((2000U / freq) + 1);
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}
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static inline void lsm6dsl_shub_embedded_en(struct lsm6dsl_data *data, bool on)
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{
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uint8_t func_en = (on) ? 0x1 : 0x0;
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data->hw_tf->update_reg(data, LSM6DSL_REG_FUNC_CFG_ACCESS,
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LSM6DSL_MASK_FUNC_CFG_EN,
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func_en << LSM6DSL_SHIFT_FUNC_CFG_EN);
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k_sleep(K_MSEC(1));
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}
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#ifdef LSM6DSL_DEBUG
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static int lsm6dsl_read_embedded_reg(struct lsm6dsl_data *data,
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uint8_t reg_addr, uint8_t *value, int len)
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{
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lsm6dsl_shub_embedded_en(data, true);
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if (data->hw_tf->read_data(data, reg_addr, value, len) < 0) {
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LOG_DBG("failed to read external reg: %02x", reg_addr);
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lsm6dsl_shub_embedded_en(data, false);
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return -EIO;
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}
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lsm6dsl_shub_embedded_en(data, false);
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return 0;
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}
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#endif
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static int lsm6dsl_shub_write_embedded_regs(struct lsm6dsl_data *data,
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uint8_t reg_addr,
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uint8_t *value, uint8_t len)
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{
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lsm6dsl_shub_embedded_en(data, true);
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if (data->hw_tf->write_data(data, reg_addr, value, len) < 0) {
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LOG_DBG("failed to write external reg: %02x", reg_addr);
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lsm6dsl_shub_embedded_en(data, false);
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return -EIO;
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}
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lsm6dsl_shub_embedded_en(data, false);
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return 0;
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}
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static void lsm6dsl_shub_enable(struct lsm6dsl_data *data)
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{
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/* Enable Digital Func */
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data->hw_tf->update_reg(data, LSM6DSL_REG_CTRL10_C,
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LSM6DSL_MASK_CTRL10_C_FUNC_EN,
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1 << LSM6DSL_SHIFT_CTRL10_C_FUNC_EN);
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/* Enable Accel @26hz */
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if (!data->accel_freq) {
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data->hw_tf->update_reg(data,
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LSM6DSL_REG_CTRL1_XL,
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LSM6DSL_MASK_CTRL1_XL_ODR_XL,
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2 << LSM6DSL_SHIFT_CTRL1_XL_ODR_XL);
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}
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/* Enable Sensor Hub */
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data->hw_tf->update_reg(data, LSM6DSL_REG_MASTER_CONFIG,
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LSM6DSL_MASK_MASTER_CONFIG_MASTER_ON,
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1 << LSM6DSL_SHIFT_MASTER_CONFIG_MASTER_ON);
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}
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static void lsm6dsl_shub_disable(struct lsm6dsl_data *data)
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{
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/* Disable Sensor Hub */
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data->hw_tf->update_reg(data, LSM6DSL_REG_MASTER_CONFIG,
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LSM6DSL_MASK_MASTER_CONFIG_MASTER_ON,
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0 << LSM6DSL_SHIFT_MASTER_CONFIG_MASTER_ON);
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/* Disable Accel */
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if (!data->accel_freq) {
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data->hw_tf->update_reg(data,
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LSM6DSL_REG_CTRL1_XL,
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LSM6DSL_MASK_CTRL1_XL_ODR_XL,
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0 << LSM6DSL_SHIFT_CTRL1_XL_ODR_XL);
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}
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/* Disable Digital Func */
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data->hw_tf->update_reg(data, LSM6DSL_REG_CTRL10_C,
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LSM6DSL_MASK_CTRL10_C_FUNC_EN,
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0 << LSM6DSL_SHIFT_CTRL10_C_FUNC_EN);
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}
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/*
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* use SLV0 for generic read to slave device
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*/
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static int lsm6dsl_shub_read_slave_reg(struct lsm6dsl_data *data,
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uint8_t slv_addr, uint8_t slv_reg,
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uint8_t *value, uint16_t len)
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{
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uint8_t slave[3];
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slave[0] = (slv_addr << 1) | LSM6DSL_EMBEDDED_SLVX_READ;
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slave[1] = slv_reg;
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slave[2] = (len & 0x7);
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if (lsm6dsl_shub_write_embedded_regs(data, LSM6DSL_EMBEDDED_SLV0_ADDR,
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slave, 3) < 0) {
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LOG_DBG("error writing embedded reg");
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return -EIO;
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}
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/* turn SH on */
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lsm6dsl_shub_enable(data);
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lsm6dsl_shub_wait_completed(data);
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data->hw_tf->read_data(data, LSM6DSL_REG_SENSORHUB1, value, len);
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lsm6dsl_shub_disable(data);
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return 0;
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}
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/*
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* use SLV0 to configure slave device
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*/
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static int lsm6dsl_shub_write_slave_reg(struct lsm6dsl_data *data,
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uint8_t slv_addr, uint8_t slv_reg,
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uint8_t *value, uint16_t len)
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{
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uint8_t slv_cfg[3];
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uint8_t cnt = 0U;
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while (cnt < len) {
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slv_cfg[0] = (slv_addr << 1) & ~LSM6DSL_EMBEDDED_SLVX_READ;
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slv_cfg[1] = slv_reg + cnt;
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if (lsm6dsl_shub_write_embedded_regs(data,
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LSM6DSL_EMBEDDED_SLV0_ADDR,
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slv_cfg, 2) < 0) {
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LOG_DBG("error writing embedded reg");
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return -EIO;
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}
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slv_cfg[0] = value[cnt];
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if (lsm6dsl_shub_write_embedded_regs(data,
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LSM6DSL_EMBEDDED_SLV0_DATAWRITE,
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slv_cfg, 1) < 0) {
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LOG_DBG("error writing embedded reg");
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return -EIO;
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}
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/* turn SH on */
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lsm6dsl_shub_enable(data);
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lsm6dsl_shub_wait_completed(data);
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lsm6dsl_shub_disable(data);
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cnt++;
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}
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/* Put master in IDLE mode */
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slv_cfg[0] = LSM6DSL_EMBEDDED_SLV0_WRITE_IDLE;
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slv_cfg[1] = lsm6dsl_shub_sens_list[0].wai_addr;
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slv_cfg[2] = LSM6DSL_EMBEDDED_SLVX_THREE_SENS;
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if (lsm6dsl_shub_write_embedded_regs(data,
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LSM6DSL_EMBEDDED_SLV0_ADDR,
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slv_cfg, 3) < 0) {
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LOG_DBG("error writing embedded reg");
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return -EIO;
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}
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return 0;
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}
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/*
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* SLAVEs configurations:
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*
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* - SLAVE 0: used for configuring the slave device
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* - SLAVE 1: used as data read channel to slave device
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* - SLAVE 2: used for generic reads while data channel is enabled
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*/
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static int lsm6dsl_shub_set_data_channel(struct lsm6dsl_data *data)
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{
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uint8_t slv_cfg[3];
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uint8_t slv_i2c_addr = lsm6dsl_shub_sens_list[0].i2c_addr[ext_i2c_addr];
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/* SLV0 is used for generic write */
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slv_cfg[0] = LSM6DSL_EMBEDDED_SLV0_WRITE_IDLE;
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slv_cfg[1] = lsm6dsl_shub_sens_list[0].wai_addr;
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slv_cfg[2] = LSM6DSL_EMBEDDED_SLVX_THREE_SENS;
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if (lsm6dsl_shub_write_embedded_regs(data,
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LSM6DSL_EMBEDDED_SLV0_ADDR,
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slv_cfg, 3) < 0) {
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LOG_DBG("error writing embedded reg");
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return -EIO;
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}
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/* Set data channel for slave device */
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slv_cfg[0] = (slv_i2c_addr << 1) | LSM6DSL_EMBEDDED_SLVX_READ;
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slv_cfg[1] = lsm6dsl_shub_sens_list[0].out_data_addr;
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slv_cfg[2] = lsm6dsl_shub_sens_list[0].out_data_len;
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if (lsm6dsl_shub_write_embedded_regs(data,
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LSM6DSL_EMBEDDED_SLV1_ADDR,
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slv_cfg, 3) < 0) {
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LOG_DBG("error writing embedded reg");
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return -EIO;
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}
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/* turn SH on */
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lsm6dsl_shub_enable(data);
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lsm6dsl_shub_wait_completed(data);
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return 0;
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}
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int lsm6dsl_shub_read_external_chip(struct device *dev, uint8_t *buf, uint8_t len)
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{
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struct lsm6dsl_data *data = dev->driver_data;
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data->hw_tf->read_data(data, LSM6DSL_REG_SENSORHUB1, buf, len);
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return 0;
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}
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int lsm6dsl_shub_init_external_chip(struct device *dev)
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{
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struct lsm6dsl_data *data = dev->driver_data;
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uint8_t i;
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uint8_t chip_id = 0U;
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uint8_t slv_i2c_addr;
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uint8_t slv_wai_addr = lsm6dsl_shub_sens_list[0].wai_addr;
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/*
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* The external sensor may have different I2C address.
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* So, try them one by one until we read the correct
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* chip ID.
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*/
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for (i = 0U; i < ARRAY_SIZE(lsm6dsl_shub_sens_list[0].i2c_addr); i++) {
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slv_i2c_addr = lsm6dsl_shub_sens_list[0].i2c_addr[i];
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if (slv_i2c_addr == 0U) {
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continue;
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}
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if (lsm6dsl_shub_read_slave_reg(data, slv_i2c_addr,
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slv_wai_addr,
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&chip_id, 1) < 0) {
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LOG_DBG("failed reading external chip id");
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return -EIO;
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}
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if (chip_id == lsm6dsl_shub_sens_list[0].wai_val) {
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break;
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}
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}
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if (i >= ARRAY_SIZE(lsm6dsl_shub_sens_list[0].i2c_addr)) {
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LOG_DBG("invalid chip id 0x%x", chip_id);
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return -EIO;
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}
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LOG_DBG("Ext Device Chip Id: %02x", chip_id);
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ext_i2c_addr = i;
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/* init external device */
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lsm6dsl_shub_sens_list[0].dev_init(data, slv_i2c_addr);
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lsm6dsl_shub_set_data_channel(data);
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return 0;
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}
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