1 /*
2 * Copyright (c) 2016-2021 Intel Corporation
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT st_hts221
8
9 #include <zephyr/device.h>
10 #include <zephyr/sys/__assert.h>
11 #include <zephyr/sys/util.h>
12 #include <zephyr/kernel.h>
13 #include <zephyr/logging/log.h>
14
15 #include "hts221.h"
16
17 LOG_MODULE_DECLARE(HTS221, CONFIG_SENSOR_LOG_LEVEL);
18
setup_drdy(const struct device * dev,bool enable)19 static inline void setup_drdy(const struct device *dev,
20 bool enable)
21 {
22 const struct hts221_config *cfg = dev->config;
23 unsigned int flags = enable
24 ? GPIO_INT_EDGE_TO_ACTIVE
25 : GPIO_INT_DISABLE;
26
27 gpio_pin_interrupt_configure_dt(&cfg->gpio_drdy, flags);
28 }
29
handle_drdy(const struct device * dev)30 static inline void handle_drdy(const struct device *dev)
31 {
32 struct hts221_data *data = dev->data;
33
34 setup_drdy(dev, false);
35
36 #if defined(CONFIG_HTS221_TRIGGER_OWN_THREAD)
37 k_sem_give(&data->drdy_sem);
38 #elif defined(CONFIG_HTS221_TRIGGER_GLOBAL_THREAD)
39 k_work_submit(&data->work);
40 #endif
41 }
42
process_drdy(const struct device * dev)43 static void process_drdy(const struct device *dev)
44 {
45 struct hts221_data *data = dev->data;
46
47 if (data->data_ready_handler != NULL) {
48 data->data_ready_handler(dev, data->data_ready_trigger);
49 }
50
51 if (data->data_ready_handler != NULL) {
52 setup_drdy(dev, true);
53 }
54 }
55
hts221_trigger_set(const struct device * dev,const struct sensor_trigger * trig,sensor_trigger_handler_t handler)56 int hts221_trigger_set(const struct device *dev,
57 const struct sensor_trigger *trig,
58 sensor_trigger_handler_t handler)
59 {
60 struct hts221_data *data = dev->data;
61 const struct hts221_config *cfg = dev->config;
62
63 __ASSERT_NO_MSG(trig->type == SENSOR_TRIG_DATA_READY);
64
65 setup_drdy(dev, false);
66
67 data->data_ready_handler = handler;
68 if (handler == NULL) {
69 return 0;
70 }
71
72 data->data_ready_trigger = trig;
73
74 setup_drdy(dev, true);
75
76 /* If DRDY is active we probably won't get the rising edge, so
77 * invoke the callback manually.
78 */
79 if (gpio_pin_get_dt(&cfg->gpio_drdy) > 0) {
80 handle_drdy(dev);
81 }
82
83 return 0;
84 }
85
hts221_drdy_callback(const struct device * dev,struct gpio_callback * cb,uint32_t pins)86 static void hts221_drdy_callback(const struct device *dev,
87 struct gpio_callback *cb, uint32_t pins)
88 {
89 struct hts221_data *data =
90 CONTAINER_OF(cb, struct hts221_data, drdy_cb);
91
92 ARG_UNUSED(pins);
93
94 handle_drdy(data->dev);
95 }
96
97 #ifdef CONFIG_HTS221_TRIGGER_OWN_THREAD
hts221_thread(struct hts221_data * data)98 static void hts221_thread(struct hts221_data *data)
99 {
100 while (1) {
101 k_sem_take(&data->drdy_sem, K_FOREVER);
102 process_drdy(data->dev);
103 }
104 }
105 #endif
106
107 #ifdef CONFIG_HTS221_TRIGGER_GLOBAL_THREAD
hts221_work_cb(struct k_work * work)108 static void hts221_work_cb(struct k_work *work)
109 {
110 struct hts221_data *data =
111 CONTAINER_OF(work, struct hts221_data, work);
112
113 process_drdy(data->dev);
114 }
115 #endif
116
hts221_init_interrupt(const struct device * dev)117 int hts221_init_interrupt(const struct device *dev)
118 {
119 struct hts221_data *data = dev->data;
120 const struct hts221_config *cfg = dev->config;
121 stmdev_ctx_t *ctx = (stmdev_ctx_t *)&cfg->ctx;
122 int status;
123
124 if (cfg->gpio_drdy.port == NULL) {
125 LOG_DBG("gpio_drdy not defined in DT");
126 return 0;
127 }
128
129 if (!gpio_is_ready_dt(&cfg->gpio_drdy)) {
130 LOG_ERR("device %s is not ready", cfg->gpio_drdy.port->name);
131 return -ENODEV;
132 }
133
134 data->dev = dev;
135
136 /* setup data ready gpio interrupt */
137 status = gpio_pin_configure_dt(&cfg->gpio_drdy, GPIO_INPUT);
138 if (status < 0) {
139 LOG_ERR("Could not configure %s.%02u",
140 cfg->gpio_drdy.port->name, cfg->gpio_drdy.pin);
141 return status;
142 }
143
144 gpio_init_callback(&data->drdy_cb,
145 hts221_drdy_callback,
146 BIT(cfg->gpio_drdy.pin));
147
148 status = gpio_add_callback(cfg->gpio_drdy.port, &data->drdy_cb);
149 if (status < 0) {
150 LOG_ERR("Could not set gpio callback.");
151 return status;
152 }
153
154 /* enable data-ready interrupt */
155 status = hts221_drdy_on_int_set(ctx, 1);
156 if (status < 0) {
157 LOG_ERR("Could not enable data-ready interrupt.");
158 return status;
159 }
160
161 #if defined(CONFIG_HTS221_TRIGGER_OWN_THREAD)
162 k_sem_init(&data->drdy_sem, 0, K_SEM_MAX_LIMIT);
163
164 k_thread_create(&data->thread, data->thread_stack,
165 CONFIG_HTS221_THREAD_STACK_SIZE,
166 (k_thread_entry_t)hts221_thread, data,
167 NULL, NULL, K_PRIO_COOP(CONFIG_HTS221_THREAD_PRIORITY),
168 0, K_NO_WAIT);
169 #elif defined(CONFIG_HTS221_TRIGGER_GLOBAL_THREAD)
170 data->work.handler = hts221_work_cb;
171 #endif
172
173 setup_drdy(dev, true);
174
175 return 0;
176 }
177
