e186dcb34e
Adds the chip select devicetree flags to the spi_cs_control instance. Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
131 lines
2.6 KiB
C
131 lines
2.6 KiB
C
/* ST Microelectronics LPS22HH pressure and temperature sensor
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*
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* Copyright (c) 2019 STMicroelectronics
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Datasheet:
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* https://www.st.com/resource/en/datasheet/lps22hh.pdf
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*/
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#define DT_DRV_COMPAT st_lps22hh
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#include <string.h>
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#include "lps22hh.h"
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#include <logging/log.h>
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#if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
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#define LPS22HH_SPI_READ (1 << 7)
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LOG_MODULE_DECLARE(LPS22HH, CONFIG_SENSOR_LOG_LEVEL);
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static int lps22hh_spi_read(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 lps22hh_data *data = dev->driver_data;
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const struct lps22hh_config *cfg = dev->config_info;
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const struct spi_config *spi_cfg = &cfg->spi_conf;
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uint8_t buffer_tx[2] = { reg_addr | LPS22HH_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 lps22hh_spi_write(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 lps22hh_data *data = dev->driver_data;
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const struct lps22hh_config *cfg = dev->config_info;
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const struct spi_config *spi_cfg = &cfg->spi_conf;
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uint8_t buffer_tx[1] = { reg_addr & ~LPS22HH_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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int lps22hh_spi_init(struct device *dev)
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{
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struct lps22hh_data *data = dev->driver_data;
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data->ctx_spi.read_reg = (stmdev_read_ptr) lps22hh_spi_read;
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data->ctx_spi.write_reg = (stmdev_write_ptr) lps22hh_spi_write;
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data->ctx = &data->ctx_spi;
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data->ctx->handle = dev;
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#if DT_INST_SPI_DEV_HAS_CS_GPIOS(0)
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const struct lps22hh_config *cfg = dev->config_info;
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/* handle SPI CS thru GPIO if it is the case */
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data->cs_ctrl.gpio_dev = device_get_binding(cfg->gpio_cs_port);
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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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data->cs_ctrl.gpio_pin = cfg->cs_gpio;
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data->cs_ctrl.gpio_dt_flags = cfg->cs_gpio_flags;
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data->cs_ctrl.delay = 0;
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LOG_DBG("SPI GPIO CS configured on %s:%u",
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cfg->gpio_cs_port, cfg->cs_gpio);
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#endif
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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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