1 /*
2 * Copyright (c) 2024 SILA Embedded Solutions GmbH
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT maxim_max31790_fan_fault
8
9 #include <zephyr/drivers/mfd/max31790.h>
10 #include <zephyr/drivers/sensor.h>
11 #include <zephyr/drivers/sensor/max31790.h>
12 #include <zephyr/logging/log.h>
13
14 #include "max31790_fan_fault.h"
15
16 LOG_MODULE_REGISTER(MAX31790_FAN_FAULT, CONFIG_SENSOR_LOG_LEVEL);
17
max31790_fan_fault_sample_fetch(const struct device * dev,enum sensor_channel chan)18 static int max31790_fan_fault_sample_fetch(const struct device *dev, enum sensor_channel chan)
19 {
20 const struct max31790_fan_fault_config *config = dev->config;
21 struct max31790_fan_fault_data *data = dev->data;
22 int result;
23 uint8_t value;
24
25 __ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL);
26
27 result = i2c_reg_read_byte_dt(&config->i2c, MAX37190_REGISTER_FANFAULTSTATUS1, &value);
28 if (result != 0) {
29 return result;
30 }
31
32 data->value = value & 0x3F;
33
34 return 0;
35 }
36
max31790_fan_fault_channel_get(const struct device * dev,enum sensor_channel chan,struct sensor_value * val)37 static int max31790_fan_fault_channel_get(const struct device *dev, enum sensor_channel chan,
38 struct sensor_value *val)
39 {
40 struct max31790_fan_fault_data *data = dev->data;
41
42 if ((enum sensor_channel_max31790)chan != SENSOR_CHAN_MAX31790_FAN_FAULT) {
43 LOG_ERR("%s: requesting unsupported channel %i", dev->name, chan);
44 return -ENOTSUP;
45 }
46
47 val->val1 = data->value;
48 val->val2 = 0;
49 return 0;
50 }
51
52 static DEVICE_API(sensor, max31790_fan_fault_api) = {
53 .sample_fetch = max31790_fan_fault_sample_fetch,
54 .channel_get = max31790_fan_fault_channel_get,
55 };
56
max31790_fan_fault_init(const struct device * dev)57 static int max31790_fan_fault_init(const struct device *dev)
58 {
59 const struct max31790_fan_fault_config *config = dev->config;
60
61 if (!i2c_is_ready_dt(&config->i2c)) {
62 LOG_ERR("I2C device not ready");
63 return -ENODEV;
64 }
65
66 return 0;
67 }
68
69 #define MAX31790_FAN_FAULT_INIT(inst) \
70 static const struct max31790_fan_fault_config max31790_fan_fault_##inst##_config = { \
71 .i2c = I2C_DT_SPEC_GET(DT_INST_PARENT(inst)), \
72 }; \
73 \
74 static struct max31790_fan_fault_data max31790_fan_fault_##inst##_data; \
75 \
76 SENSOR_DEVICE_DT_INST_DEFINE(inst, max31790_fan_fault_init, NULL, \
77 &max31790_fan_fault_##inst##_data, \
78 &max31790_fan_fault_##inst##_config, POST_KERNEL, \
79 CONFIG_SENSOR_INIT_PRIORITY, &max31790_fan_fault_api);
80
81 DT_INST_FOREACH_STATUS_OKAY(MAX31790_FAN_FAULT_INIT);
82
