zephyr/drivers/sensor/lis2mdl/lis2mdl_spi.c
Jordan Yates 9a6ec94aa7 sensor: lis2mdl: Add chip select flags
Adds the chip select devicetree flags to the spi_cs_control instance.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
2020-07-01 16:40:03 -05:00

138 lines
2.8 KiB
C

/* ST Microelectronics LIS2MDL 3-axis magnetometer sensor
*
* Copyright (c) 2019 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*
* Datasheet:
* https://www.st.com/resource/en/datasheet/lis2mdl.pdf
*/
#define DT_DRV_COMPAT st_lis2mdl
#include <string.h>
#include "lis2mdl.h"
#include <logging/log.h>
#if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
#define LIS2MDL_SPI_READ (1 << 7)
#define LOG_LEVEL CONFIG_SENSOR_LOG_LEVEL
LOG_MODULE_DECLARE(LIS2MDL);
static int lis2mdl_spi_read(struct device *dev, uint8_t reg_addr,
uint8_t *value, uint8_t len)
{
struct lis2mdl_data *data = dev->driver_data;
const struct lis2mdl_config *cfg = dev->config_info;
const struct spi_config *spi_cfg = &cfg->spi_conf;
uint8_t buffer_tx[2] = { reg_addr | LIS2MDL_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 = value,
.len = len,
}
};
const struct spi_buf_set rx = {
.buffers = rx_buf,
.count = 2
};
if (len > 64) {
return -EIO;
}
if (spi_transceive(data->bus, spi_cfg, &tx, &rx)) {
return -EIO;
}
return 0;
}
static int lis2mdl_spi_write(struct device *dev, uint8_t reg_addr,
uint8_t *value, uint8_t len)
{
struct lis2mdl_data *data = dev->driver_data;
const struct lis2mdl_config *cfg = dev->config_info;
const struct spi_config *spi_cfg = &cfg->spi_conf;
uint8_t buffer_tx[1] = { reg_addr & ~LIS2MDL_SPI_READ };
const struct spi_buf tx_buf[2] = {
{
.buf = buffer_tx,
.len = 1,
},
{
.buf = value,
.len = len,
}
};
const struct spi_buf_set tx = {
.buffers = tx_buf,
.count = 2
};
if (len > 64) {
return -EIO;
}
if (spi_write(data->bus, spi_cfg, &tx)) {
return -EIO;
}
return 0;
}
int lis2mdl_spi_init(struct device *dev)
{
struct lis2mdl_data *data = dev->driver_data;
data->ctx_spi.read_reg = (stmdev_read_ptr) lis2mdl_spi_read;
data->ctx_spi.write_reg = (stmdev_write_ptr) lis2mdl_spi_write;
data->ctx = &data->ctx_spi;
data->ctx->handle = dev;
#if DT_INST_SPI_DEV_HAS_CS_GPIOS(0)
const struct lis2mdl_config *cfg = dev->config_info;
/* handle SPI CS thru GPIO if it is the case */
data->cs_ctrl.gpio_dev = device_get_binding(cfg->gpio_cs_port);
if (!data->cs_ctrl.gpio_dev) {
LOG_ERR("Unable to get GPIO SPI CS device");
return -ENODEV;
}
data->cs_ctrl.gpio_pin = cfg->cs_gpio;
data->cs_ctrl.gpio_dt_flags = cfg->cs_gpio_flags;
data->cs_ctrl.delay = 0;
LOG_DBG("SPI GPIO CS configured on %s:%u",
cfg->gpio_cs_port, cfg->cs_gpio);
#endif
#if CONFIG_LIS2MDL_SPI_FULL_DUPLEX
/* Set SPI 4wires */
if (lis2mdl_spi_mode_set(data->ctx, LIS2MDL_SPI_4_WIRE) < 0) {
return -EIO;
}
#endif
return 0;
}
#endif /* DT_ANY_INST_ON_BUS_STATUS_OKAY(spi) */