108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
/*
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* Copyright (c) 2021 Jonathan Hahn
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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_i3g4250d
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#include <zephyr/logging/log.h>
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#include "i3g4250d.h"
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#if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
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#define I3G4250D_SPI_READM (3 << 6) /* 0xC0 */
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#define I3G4250D_SPI_WRITEM (1 << 6) /* 0x40 */
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LOG_MODULE_DECLARE(i3g4250d, CONFIG_SENSOR_LOG_LEVEL);
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static int i3g4250d_spi_read(const struct device *dev, uint8_t reg,
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uint8_t *data, uint16_t len)
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{
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int ret;
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const struct i3g4250d_device_config *config = dev->config;
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uint8_t buffer_tx[2] = { reg | I3G4250D_SPI_READM, 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 = data,
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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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ret = spi_transceive_dt(&config->spi, &tx, &rx);
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if (ret < 0) {
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return ret;
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}
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return 0;
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}
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static int i3g4250d_spi_write(const struct device *dev, uint8_t reg,
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uint8_t *data, uint16_t len)
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{
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int ret;
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const struct i3g4250d_device_config *config = dev->config;
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uint8_t buffer_tx[2] = { reg | I3G4250D_SPI_WRITEM, 0 };
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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 = data,
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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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ret = spi_write_dt(&config->spi, &tx);
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if (ret < 0) {
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return ret;
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}
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return 0;
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}
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stmdev_ctx_t i3g4250d_spi_ctx = {
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.read_reg = (stmdev_read_ptr) i3g4250d_spi_read,
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.write_reg = (stmdev_write_ptr) i3g4250d_spi_write,
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.mdelay = (stmdev_mdelay_ptr) stmemsc_mdelay,
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};
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int i3g4250d_spi_init(const struct device *dev)
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{
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struct i3g4250d_data *i3g4250d = dev->data;
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const struct i3g4250d_device_config *cfg = dev->config;
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if (!spi_is_ready_dt(&cfg->spi)) {
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LOG_ERR("spi not ready");
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return -ENODEV;
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}
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i3g4250d->ctx = &i3g4250d_spi_ctx;
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i3g4250d->ctx->handle = (void *)dev;
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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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