1 /* ST Microelectronics LIS2DH 3-axis accelerometer driver
2 *
3 * Copyright (c) 2020 STMicroelectronics
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Datasheet:
8 * https://www.st.com/resource/en/datasheet/lis2dh.pdf
9 */
10
11 #define DT_DRV_COMPAT st_lis2dh
12
13 #include <string.h>
14 #include "lis2dh.h"
15 #include <zephyr/logging/log.h>
16
17 #if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
18
19 LOG_MODULE_DECLARE(lis2dh, CONFIG_SENSOR_LOG_LEVEL);
20
21
22 #define LIS2DH_SPI_READ_BIT BIT(7)
23 #define LIS2DH_SPI_AUTOINC BIT(6)
24 #define LIS2DH_SPI_ADDR_MASK BIT_MASK(6)
25
lis2dh_raw_read(const struct device * dev,uint8_t reg_addr,uint8_t * value,uint8_t len)26 static int lis2dh_raw_read(const struct device *dev, uint8_t reg_addr,
27 uint8_t *value, uint8_t len)
28 {
29 const struct lis2dh_config *cfg = dev->config;
30 uint8_t buffer_tx[2] = { reg_addr | LIS2DH_SPI_READ_BIT, 0 };
31 const struct spi_buf tx_buf = {
32 .buf = buffer_tx,
33 .len = 2,
34 };
35 const struct spi_buf_set tx = {
36 .buffers = &tx_buf,
37 .count = 1
38 };
39 const struct spi_buf rx_buf[2] = {
40 {
41 .buf = NULL,
42 .len = 1,
43 },
44 {
45 .buf = value,
46 .len = len,
47 }
48 };
49 const struct spi_buf_set rx = {
50 .buffers = rx_buf,
51 .count = 2
52 };
53
54
55 if (len > 64) {
56 return -EIO;
57 }
58
59 if (len > 1) {
60 buffer_tx[0] |= LIS2DH_SPI_AUTOINC;
61 }
62
63 if (spi_transceive_dt(&cfg->bus_cfg.spi, &tx, &rx)) {
64 return -EIO;
65 }
66
67 return 0;
68 }
69
lis2dh_raw_write(const struct device * dev,uint8_t reg_addr,uint8_t * value,uint8_t len)70 static int lis2dh_raw_write(const struct device *dev, uint8_t reg_addr,
71 uint8_t *value, uint8_t len)
72 {
73 const struct lis2dh_config *cfg = dev->config;
74 uint8_t buffer_tx[1] = { reg_addr & ~LIS2DH_SPI_READ_BIT };
75 const struct spi_buf tx_buf[2] = {
76 {
77 .buf = buffer_tx,
78 .len = 1,
79 },
80 {
81 .buf = value,
82 .len = len,
83 }
84 };
85 const struct spi_buf_set tx = {
86 .buffers = tx_buf,
87 .count = 2
88 };
89
90
91 if (len > 64) {
92 return -EIO;
93 }
94
95 if (len > 1) {
96 buffer_tx[0] |= LIS2DH_SPI_AUTOINC;
97 }
98
99 if (spi_write_dt(&cfg->bus_cfg.spi, &tx)) {
100 return -EIO;
101 }
102
103 return 0;
104 }
105
lis2dh_spi_read_data(const struct device * dev,uint8_t reg_addr,uint8_t * value,uint8_t len)106 static int lis2dh_spi_read_data(const struct device *dev, uint8_t reg_addr,
107 uint8_t *value, uint8_t len)
108 {
109 return lis2dh_raw_read(dev, reg_addr, value, len);
110 }
111
lis2dh_spi_write_data(const struct device * dev,uint8_t reg_addr,uint8_t * value,uint8_t len)112 static int lis2dh_spi_write_data(const struct device *dev, uint8_t reg_addr,
113 uint8_t *value, uint8_t len)
114 {
115 return lis2dh_raw_write(dev, reg_addr, value, len);
116 }
117
lis2dh_spi_read_reg(const struct device * dev,uint8_t reg_addr,uint8_t * value)118 static int lis2dh_spi_read_reg(const struct device *dev, uint8_t reg_addr,
119 uint8_t *value)
120 {
121 return lis2dh_raw_read(dev, reg_addr, value, 1);
122 }
123
lis2dh_spi_write_reg(const struct device * dev,uint8_t reg_addr,uint8_t value)124 static int lis2dh_spi_write_reg(const struct device *dev, uint8_t reg_addr,
125 uint8_t value)
126 {
127 uint8_t tmp_val = value;
128
129 return lis2dh_raw_write(dev, reg_addr, &tmp_val, 1);
130 }
131
lis2dh_spi_update_reg(const struct device * dev,uint8_t reg_addr,uint8_t mask,uint8_t value)132 static int lis2dh_spi_update_reg(const struct device *dev, uint8_t reg_addr,
133 uint8_t mask, uint8_t value)
134 {
135 uint8_t tmp_val;
136
137 lis2dh_raw_read(dev, reg_addr, &tmp_val, 1);
138 tmp_val = (tmp_val & ~mask) | (value & mask);
139
140 return lis2dh_raw_write(dev, reg_addr, &tmp_val, 1);
141 }
142
143 static const struct lis2dh_transfer_function lis2dh_spi_transfer_fn = {
144 .read_data = lis2dh_spi_read_data,
145 .write_data = lis2dh_spi_write_data,
146 .read_reg = lis2dh_spi_read_reg,
147 .write_reg = lis2dh_spi_write_reg,
148 .update_reg = lis2dh_spi_update_reg,
149 };
150
lis2dh_spi_init(const struct device * dev)151 int lis2dh_spi_init(const struct device *dev)
152 {
153 struct lis2dh_data *data = dev->data;
154 const struct lis2dh_config *cfg = dev->config;
155
156 data->hw_tf = &lis2dh_spi_transfer_fn;
157
158 if (!spi_is_ready_dt(&cfg->bus_cfg.spi)) {
159 LOG_ERR("SPI bus is not ready");
160 return -ENODEV;
161 }
162
163 return 0;
164 }
165 #endif /* DT_ANY_INST_ON_BUS_STATUS_OKAY(spi) */
166
