| /* ST Microelectronics IIS2MDC 3-axis magnetometer sensor |
| * |
| * Copyright (c) 2020 STMicroelectronics |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Datasheet: |
| * https://www.st.com/resource/en/datasheet/iis2mdc.pdf |
| */ |
| |
| #define DT_DRV_COMPAT st_iis2mdc |
| |
| #include <string.h> |
| #include "iis2mdc.h" |
| #include <zephyr/logging/log.h> |
| |
| #if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi) |
| |
| #define IIS2MDC_SPI_READ (1 << 7) |
| |
| LOG_MODULE_DECLARE(IIS2MDC, CONFIG_SENSOR_LOG_LEVEL); |
| |
| static int iis2mdc_spi_read(const struct device *dev, uint8_t reg, |
| uint8_t *val, uint16_t len) |
| { |
| const struct iis2mdc_dev_config *cfg = dev->config; |
| uint8_t buffer_tx[2] = { reg | IIS2MDC_SPI_READ, 0 }; |
| const struct spi_buf tx_buf = { |
| .buf = buffer_tx, |
| .len = 2, |
| }; |
| const struct spi_buf_set tx = { |
| .buffers = &tx_buf, |
| .count = 1 |
| }; |
| const struct spi_buf rx_buf[2] = { |
| { |
| .buf = NULL, |
| .len = 1, |
| }, |
| { |
| .buf = val, |
| .len = len, |
| } |
| }; |
| const struct spi_buf_set rx = { |
| .buffers = rx_buf, |
| .count = 2 |
| }; |
| |
| if (len > 64) { |
| return -EIO; |
| } |
| |
| if (spi_transceive_dt(&cfg->spi, &tx, &rx)) { |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static int iis2mdc_spi_write(const struct device *dev, uint8_t reg, |
| uint8_t *val, uint16_t len) |
| { |
| const struct iis2mdc_dev_config *cfg = dev->config; |
| uint8_t buffer_tx[1] = { reg & ~IIS2MDC_SPI_READ }; |
| const struct spi_buf tx_buf[2] = { |
| { |
| .buf = buffer_tx, |
| .len = 1, |
| }, |
| { |
| .buf = val, |
| .len = len, |
| } |
| }; |
| const struct spi_buf_set tx = { |
| .buffers = tx_buf, |
| .count = 2 |
| }; |
| |
| if (len > 64) { |
| return -EIO; |
| } |
| |
| if (spi_write_dt(&cfg->spi, &tx)) { |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| int iis2mdc_spi_init(const struct device *dev) |
| { |
| struct iis2mdc_data *data = dev->data; |
| const struct iis2mdc_dev_config *const cfg = dev->config; |
| |
| if (!spi_is_ready(&cfg->spi)) { |
| LOG_ERR("SPI bus is not ready"); |
| return -ENODEV; |
| } |
| |
| data->ctx_spi.read_reg = (stmdev_read_ptr) iis2mdc_spi_read; |
| data->ctx_spi.write_reg = (stmdev_write_ptr) iis2mdc_spi_write; |
| |
| data->ctx = &data->ctx_spi; |
| data->ctx->handle = (void *)dev; |
| |
| return 0; |
| } |
| #endif /* DT_ANY_INST_ON_BUS_STATUS_OKAY(spi) */ |