160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
/* lsm6dsl_spi.c - SPI routines for LSM6DSL driver
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*/
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/*
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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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#define DT_DRV_COMPAT st_lsm6dsl
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#include <string.h>
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#include <logging/log.h>
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#include "lsm6dsl.h"
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#if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
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#define LSM6DSL_SPI_READ (1 << 7)
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LOG_MODULE_DECLARE(LSM6DSL, CONFIG_SENSOR_LOG_LEVEL);
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static int lsm6dsl_raw_read(const struct device *dev, uint8_t reg_addr,
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uint8_t *value, uint8_t len)
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{
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struct lsm6dsl_data *data = dev->data;
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const struct lsm6dsl_config *cfg = dev->config;
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const struct spi_config *spi_cfg = &cfg->bus_cfg.spi_cfg->spi_conf;
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uint8_t buffer_tx[2] = { reg_addr | LSM6DSL_SPI_READ, 0 };
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const struct spi_buf tx_buf = {
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.buf = buffer_tx,
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.len = 2,
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};
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const struct spi_buf_set tx = {
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.buffers = &tx_buf,
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.count = 1
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};
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const struct spi_buf rx_buf[2] = {
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{
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.buf = NULL,
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.len = 1,
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},
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{
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.buf = value,
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.len = len,
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}
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};
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const struct spi_buf_set rx = {
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.buffers = rx_buf,
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.count = 2
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};
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if (len > 64) {
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return -EIO;
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}
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if (spi_transceive(data->bus, spi_cfg, &tx, &rx)) {
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return -EIO;
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}
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return 0;
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}
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static int lsm6dsl_raw_write(const struct device *dev, uint8_t reg_addr,
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uint8_t *value, uint8_t len)
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{
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struct lsm6dsl_data *data = dev->data;
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const struct lsm6dsl_config *cfg = dev->config;
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const struct spi_config *spi_cfg = &cfg->bus_cfg.spi_cfg->spi_conf;
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uint8_t buffer_tx[1] = { reg_addr & ~LSM6DSL_SPI_READ };
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const struct spi_buf tx_buf[2] = {
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{
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.buf = buffer_tx,
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.len = 1,
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},
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{
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.buf = value,
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.len = len,
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}
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};
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const struct spi_buf_set tx = {
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.buffers = tx_buf,
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.count = 2
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};
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if (len > 64) {
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return -EIO;
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}
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if (spi_write(data->bus, spi_cfg, &tx)) {
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return -EIO;
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}
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return 0;
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}
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static int lsm6dsl_spi_read_data(const struct device *dev, uint8_t reg_addr,
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uint8_t *value, uint8_t len)
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{
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return lsm6dsl_raw_read(dev, reg_addr, value, len);
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}
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static int lsm6dsl_spi_write_data(const struct device *dev, uint8_t reg_addr,
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uint8_t *value, uint8_t len)
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{
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return lsm6dsl_raw_write(dev, reg_addr, value, len);
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}
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static int lsm6dsl_spi_read_reg(const struct device *dev, uint8_t reg_addr,
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uint8_t *value)
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{
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return lsm6dsl_raw_read(dev, reg_addr, value, 1);
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}
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static int lsm6dsl_spi_update_reg(const struct device *dev, uint8_t reg_addr,
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uint8_t mask, uint8_t value)
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{
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uint8_t tmp_val;
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lsm6dsl_raw_read(dev, reg_addr, &tmp_val, 1);
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tmp_val = (tmp_val & ~mask) | (value & mask);
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return lsm6dsl_raw_write(dev, reg_addr, &tmp_val, 1);
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}
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static const struct lsm6dsl_transfer_function lsm6dsl_spi_transfer_fn = {
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.read_data = lsm6dsl_spi_read_data,
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.write_data = lsm6dsl_spi_write_data,
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.read_reg = lsm6dsl_spi_read_reg,
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.update_reg = lsm6dsl_spi_update_reg,
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};
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int lsm6dsl_spi_init(const struct device *dev)
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{
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struct lsm6dsl_data *data = dev->data;
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const struct lsm6dsl_config *cfg = dev->config;
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const struct lsm6dsl_spi_cfg *spi_cfg = cfg->bus_cfg.spi_cfg;
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data->hw_tf = &lsm6dsl_spi_transfer_fn;
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if (spi_cfg->cs_gpios_label != NULL) {
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/* handle SPI CS thru GPIO if it is the case */
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data->cs_ctrl.gpio_dev =
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device_get_binding(spi_cfg->cs_gpios_label);
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if (!data->cs_ctrl.gpio_dev) {
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LOG_ERR("Unable to get GPIO SPI CS device");
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return -ENODEV;
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}
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LOG_DBG("SPI GPIO CS configured on %s:%u",
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spi_cfg->cs_gpios_label, data->cs_ctrl.gpio_pin);
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}
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return 0;
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}
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#endif /* DT_ANY_INST_ON_BUS_STATUS_OKAY(spi) */
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