1 /*
2 * Copyright (c) 2019 Peter Bigot Consulting, LLC
3 * Copyright (c) 2016 Intel Corporation
4 * Copyright (c) 2024 Vogl Electronic GmbH
5 *
6 * SPDX-License-Identifier: Apache-2.0
7 */
8
9 #define DT_DRV_COMPAT jedec_jc_42_4_temp
10
11 #include <errno.h>
12
13 #include <zephyr/kernel.h>
14 #include <zephyr/drivers/i2c.h>
15 #include <zephyr/init.h>
16 #include <zephyr/sys/byteorder.h>
17 #include <zephyr/sys/__assert.h>
18 #include <zephyr/logging/log.h>
19
20 #include "jc42.h"
21
22 LOG_MODULE_REGISTER(JC42, CONFIG_SENSOR_LOG_LEVEL);
23
jc42_reg_read(const struct device * dev,uint8_t reg,uint16_t * val)24 int jc42_reg_read(const struct device *dev, uint8_t reg, uint16_t *val)
25 {
26 const struct jc42_config *cfg = dev->config;
27 int rc = i2c_write_read_dt(&cfg->i2c, ®, sizeof(reg), val, sizeof(*val));
28
29 if (rc == 0) {
30 *val = sys_be16_to_cpu(*val);
31 }
32
33 return rc;
34 }
35
jc42_reg_write_16bit(const struct device * dev,uint8_t reg,uint16_t val)36 int jc42_reg_write_16bit(const struct device *dev, uint8_t reg, uint16_t val)
37 {
38 const struct jc42_config *cfg = dev->config;
39
40 uint8_t buf[3];
41
42 buf[0] = reg;
43 sys_put_be16(val, &buf[1]);
44
45 return i2c_write_dt(&cfg->i2c, buf, sizeof(buf));
46 }
47
jc42_reg_write_8bit(const struct device * dev,uint8_t reg,uint8_t val)48 int jc42_reg_write_8bit(const struct device *dev, uint8_t reg, uint8_t val)
49 {
50 const struct jc42_config *cfg = dev->config;
51 uint8_t buf[2] = {
52 reg,
53 val,
54 };
55
56 return i2c_write_dt(&cfg->i2c, buf, sizeof(buf));
57 }
58
jc42_set_temperature_resolution(const struct device * dev,uint8_t resolution)59 static int jc42_set_temperature_resolution(const struct device *dev, uint8_t resolution)
60 {
61 return jc42_reg_write_8bit(dev, JC42_REG_RESOLUTION, resolution);
62 }
63
jc42_sample_fetch(const struct device * dev,enum sensor_channel chan)64 static int jc42_sample_fetch(const struct device *dev, enum sensor_channel chan)
65 {
66 struct jc42_data *data = dev->data;
67
68 __ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_AMBIENT_TEMP);
69
70 return jc42_reg_read(dev, JC42_REG_TEMP_AMB, &data->reg_val);
71 }
72
jc42_channel_get(const struct device * dev,enum sensor_channel chan,struct sensor_value * val)73 static int jc42_channel_get(const struct device *dev, enum sensor_channel chan,
74 struct sensor_value *val)
75 {
76 const struct jc42_data *data = dev->data;
77 int temp = jc42_temp_signed_from_reg(data->reg_val);
78
79 __ASSERT_NO_MSG(chan == SENSOR_CHAN_AMBIENT_TEMP);
80
81 if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
82 return -ENOTSUP;
83 }
84
85 val->val1 = temp / JC42_TEMP_SCALE_CEL;
86 temp -= val->val1 * JC42_TEMP_SCALE_CEL;
87 val->val2 = (temp * 1000000) / JC42_TEMP_SCALE_CEL;
88
89 return 0;
90 }
91
92 static DEVICE_API(sensor, jc42_api_funcs) = {
93 .sample_fetch = jc42_sample_fetch,
94 .channel_get = jc42_channel_get,
95 #ifdef CONFIG_JC42_TRIGGER
96 .attr_set = jc42_attr_set,
97 .trigger_set = jc42_trigger_set,
98 #endif /* CONFIG_JC42_TRIGGER */
99 };
100
jc42_init(const struct device * dev)101 int jc42_init(const struct device *dev)
102 {
103 const struct jc42_config *cfg = dev->config;
104 int rc = 0;
105
106 if (!device_is_ready(cfg->i2c.bus)) {
107 LOG_ERR("Bus device is not ready");
108 return -ENODEV;
109 }
110
111 rc = jc42_set_temperature_resolution(dev, cfg->resolution);
112 if (rc) {
113 LOG_ERR("Could not set the resolution of jc42 module");
114 return rc;
115 }
116
117 #ifdef CONFIG_JC42_TRIGGER
118 if (cfg->int_gpio.port) {
119 rc = jc42_setup_interrupt(dev);
120 }
121 #endif /* CONFIG_JC42_TRIGGER */
122
123 return rc;
124 }
125
126 #define JC42_DEFINE(inst) \
127 static struct jc42_data jc42_data_##inst; \
128 \
129 static const struct jc42_config jc42_config_##inst = { \
130 .i2c = I2C_DT_SPEC_INST_GET(inst), \
131 .resolution = DT_INST_PROP(inst, resolution), \
132 IF_ENABLED(CONFIG_JC42_TRIGGER, \
133 (.int_gpio = GPIO_DT_SPEC_INST_GET_OR(inst, int_gpios, {0}),))}; \
134 \
135 SENSOR_DEVICE_DT_INST_DEFINE(inst, jc42_init, NULL, &jc42_data_##inst, \
136 &jc42_config_##inst, POST_KERNEL, \
137 CONFIG_SENSOR_INIT_PRIORITY, &jc42_api_funcs);
138
139 DT_INST_FOREACH_STATUS_OKAY(JC42_DEFINE)
140
