1 /*
2 * Copyright 2023 Google LLC
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6 #define DT_DRV_COMPAT zephyr_kscan_input
7
8 #include <zephyr/drivers/kscan.h>
9 #include <zephyr/input/input.h>
10
11 #include <zephyr/logging/log.h>
12 LOG_MODULE_REGISTER(kscan_input, CONFIG_KSCAN_LOG_LEVEL);
13
14 struct kscan_input_config {
15 const struct device *input_dev;
16 };
17
18 struct kscan_input_data {
19 bool enabled;
20 kscan_callback_t callback;
21 int row;
22 int col;
23 bool pressed;
24 };
25
kscan_input_cb(struct input_event * evt,void * user_data)26 static void kscan_input_cb(struct input_event *evt, void *user_data)
27 {
28 const struct device *dev = user_data;
29 struct kscan_input_data *data = dev->data;
30
31 switch (evt->code) {
32 case INPUT_ABS_X:
33 data->col = evt->value;
34 break;
35 case INPUT_ABS_Y:
36 data->row = evt->value;
37 break;
38 case INPUT_BTN_TOUCH:
39 data->pressed = evt->value;
40 break;
41 }
42
43 if (evt->sync) {
44 LOG_DBG("input event: %3d %3d %d",
45 data->row, data->col, data->pressed);
46 if (data->callback) {
47 data->callback(dev, data->row, data->col, data->pressed);
48 }
49 }
50 }
51
kscan_input_configure(const struct device * dev,kscan_callback_t callback)52 static int kscan_input_configure(const struct device *dev,
53 kscan_callback_t callback)
54 {
55 struct kscan_input_data *data = dev->data;
56
57 if (!callback) {
58 LOG_ERR("Invalid callback (NULL)");
59 return -EINVAL;
60 }
61
62 data->callback = callback;
63
64 return 0;
65 }
66
kscan_input_enable_callback(const struct device * dev)67 static int kscan_input_enable_callback(const struct device *dev)
68 {
69 struct kscan_input_data *data = dev->data;
70
71 data->enabled = true;
72
73 return 0;
74 }
75
kscan_input_disable_callback(const struct device * dev)76 static int kscan_input_disable_callback(const struct device *dev)
77 {
78 struct kscan_input_data *data = dev->data;
79
80 data->enabled = false;
81
82 return 0;
83 }
84
kscan_input_init(const struct device * dev)85 static int kscan_input_init(const struct device *dev)
86 {
87 const struct kscan_input_config *cfg = dev->config;
88
89 if (!device_is_ready(cfg->input_dev)) {
90 LOG_ERR("Input device not ready");
91 return -ENODEV;
92 }
93
94 return 0;
95 }
96
97 static DEVICE_API(kscan, kscan_input_driver_api) = {
98 .config = kscan_input_configure,
99 .enable_callback = kscan_input_enable_callback,
100 .disable_callback = kscan_input_disable_callback,
101 };
102
103 #define KSCAN_INPUT_INIT(index) \
104 INPUT_CALLBACK_DEFINE_NAMED(DEVICE_DT_GET(DT_INST_PARENT(index)), \
105 kscan_input_cb, \
106 (void *)DEVICE_DT_INST_GET(index), \
107 kscan_input_cb_##index); \
108 static const struct kscan_input_config kscan_input_config_##index = { \
109 .input_dev = DEVICE_DT_GET(DT_INST_PARENT(index)), \
110 }; \
111 static struct kscan_input_data kscan_input_data_##index; \
112 DEVICE_DT_INST_DEFINE(index, kscan_input_init, NULL, \
113 &kscan_input_data_##index, \
114 &kscan_input_config_##index, \
115 POST_KERNEL, CONFIG_KSCAN_INIT_PRIORITY, \
116 &kscan_input_driver_api);
117
118 DT_INST_FOREACH_STATUS_OKAY(KSCAN_INPUT_INIT)
119
