1 /*
2 * Copyright (c) 2016, 2017 Intel Corporation
3 * Copyright (c) 2017 IpTronix S.r.l.
4 * Copyright (c) 2021 Nordic Semiconductor ASA
5 *
6 * SPDX-License-Identifier: Apache-2.0
7 */
8
9 /*
10 * Bus-specific functionality for BMP388s accessed via SPI.
11 */
12
13 #include <zephyr/logging/log.h>
14 #include "bmp388.h"
15
16 #ifdef BMP3XX_USE_SPI_BUS
17
18 LOG_MODULE_DECLARE(BMP388, CONFIG_SENSOR_LOG_LEVEL);
19
bmp388_bus_check_spi(const union bmp388_bus * bus)20 static int bmp388_bus_check_spi(const union bmp388_bus *bus)
21 {
22 return spi_is_ready_dt(&bus->spi) ? 0 : -ENODEV;
23 }
24
bmp388_reg_read_spi(const union bmp388_bus * bus,uint8_t regaddr,uint8_t * buf,int size)25 static int bmp388_reg_read_spi(const union bmp388_bus *bus, uint8_t regaddr, uint8_t *buf, int size)
26 {
27 int ret;
28
29 if ((size <= 0) || (size > BMP388_SAMPLE_BUFFER_SIZE)) {
30 return -EINVAL;
31 }
32
33 uint8_t buffer[size + 2];
34 const struct spi_buf rxtx_buf = {
35 .buf = &buffer,
36 .len = ARRAY_SIZE(buffer),
37 };
38 const struct spi_buf_set rxtx = {
39 .buffers = &rxtx_buf,
40 .count = 1
41 };
42
43 memset(buffer, 0x00, ARRAY_SIZE(buffer));
44 buffer[0] = (regaddr) | 0x80;
45
46 ret = spi_transceive_dt(&bus->spi, &rxtx, &rxtx);
47 if (ret) {
48 LOG_DBG("spi_transceive FAIL %d\n", ret);
49 return ret;
50 }
51
52 memcpy(buf, (uint8_t *)&buffer[2], size);
53
54 return 0;
55 }
56
bmp388_reg_write_spi(const union bmp388_bus * bus,uint8_t reg,uint8_t val)57 static int bmp388_reg_write_spi(const union bmp388_bus *bus,
58 uint8_t reg, uint8_t val)
59 {
60 uint8_t cmd[] = { reg & 0x7F, val };
61 const struct spi_buf tx_buf = {
62 .buf = cmd,
63 .len = sizeof(cmd)
64 };
65 const struct spi_buf_set tx = {
66 .buffers = &tx_buf,
67 .count = 1
68 };
69 int ret;
70
71 ret = spi_write_dt(&bus->spi, &tx);
72 if (ret) {
73 LOG_DBG("spi_write FAIL %d\n", ret);
74 return ret;
75 }
76 return 0;
77 }
78
79 const struct bmp388_bus_io bmp388_bus_io_spi = {
80 .check = bmp388_bus_check_spi,
81 .read = bmp388_reg_read_spi,
82 .write = bmp388_reg_write_spi,
83 };
84 #endif /* BMP3XX_USE_SPI_BUS */
85
