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modules: lvgl: input: add zephyr,lvgl-keypad-input device binding

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Add a pseudo device which can be used to hook into input events and
emit lvgl keypad events.

Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>
This commit is contained in:
Fabian Blatz 2023-10-23 11:27:35 +02:00 committed by Fabio Baltieri
parent 9102821fbe
commit d94d226fe1
7 changed files with 182 additions and 0 deletions
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41
dts/bindings/input/zephyr,lvgl-keypad-input.yaml Normal file
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@ -0,0 +1,41 @@
# Copyright 2023 Fabian Blatz <fabianblatz@gmail.com>
# SPDX-License-Identifier: Apache-2.0
description: |
LVGL keypad indev pseudo-device
Listens for input events and routes the
lv_indev_data_t to the underlying keypad lv_indev_t managed by LVGL.
The property input-codes can be used to setup a mapping of input codes
to the lvgl keys. There are lvgl keys that have a special function:
https://docs.lvgl.io/master/overview/indev.html#keys.
The pseudo device can be associated to a specific device to listen only
for events from that device. Example configuration:
#include <zephyr/dt-bindings/lvgl/lvgl.h>
keypad {
compatible = "zephyr,lvgl-keypad-input";
input = <&buttons>;
input-codes = <INPUT_KEY_1, INPUT_KEY_2>;
lvgl-codes = <LV_KEY_NEXT, LV_KEY_PREV>;
};
compatible: "zephyr,lvgl-keypad-input"
include: zephyr,lvgl-common-input.yaml
properties:
input-codes:
type: array
required: true
description: |
Array of input event key codes (INPUT_KEY_* or INPUT_BTN_*).
lvgl-codes:
type: array
required: true
description: |
Array of mapped lvgl keys.

25
include/zephyr/dt-bindings/lvgl/lvgl.h Normal file
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@ -0,0 +1,25 @@
/*
* Copyright (c) 2023 Fabian Blatz <fabianblatz@gmail.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_DT_BINDINGS_LVGL_LVGL_H_
#define ZEPHYR_INCLUDE_DT_BINDINGS_LVGL_LVGL_H_
/* Predefined keys to control the focused object.
* Values taken from enum _lv_key_t in lv_group.h
*/
#define LV_KEY_UP 17
#define LV_KEY_DOWN 18
#define LV_KEY_RIGHT 19
#define LV_KEY_LEFT 20
#define LV_KEY_ESC 27
#define LV_KEY_DEL 127
#define LV_KEY_BACKSPACE 8
#define LV_KEY_ENTER 10
#define LV_KEY_NEXT 9
#define LV_KEY_PREV 11
#define LV_KEY_HOME 2
#define LV_KEY_END 3
#endif /* ZEPHYR_INCLUDE_DT_BINDINGS_LVGL_LVGL_H_ */

1
modules/lvgl/CMakeLists.txt
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@ -228,6 +228,7 @@ zephyr_library_sources_ifdef(CONFIG_LV_Z_POINTER_KSCAN input/lvgl_pointer_kscan
zephyr_library_sources_ifdef(CONFIG_LV_Z_POINTER_INPUT input/lvgl_pointer_input.c)
zephyr_library_sources_ifdef(CONFIG_LV_Z_BUTTON_INPUT input/lvgl_button_input.c)
zephyr_library_sources_ifdef(CONFIG_LV_Z_ENCODER_INPUT input/lvgl_encoder_input.c)
zephyr_library_sources_ifdef(CONFIG_LV_Z_KEYPAD_INPUT input/lvgl_keypad_input.c)
zephyr_library_link_libraries(LVGL)
target_link_libraries(LVGL INTERFACE zephyr_interface)

13
modules/lvgl/Kconfig.input
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@ -77,4 +77,17 @@ config LV_Z_ENCODER_INPUT_MSGQ_COUNT
help
Size of the encoder message queue buffering input events.
config LV_Z_KEYPAD_INPUT
bool "Input lvgl keypad"
default y
depends on INPUT
depends on DT_HAS_ZEPHYR_LVGL_KEYPAD_INPUT_ENABLED
config LV_Z_KEYPAD_INPUT_MSGQ_COUNT
int "Input keypad queue message count"
default 4
depends on LV_Z_KEYPAD_INPUT
help
Size of the keypad message queue buffering input events.
endmenu

22
modules/lvgl/include/lvgl_keypad_input.h Normal file
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@ -0,0 +1,22 @@
/*
* Copyright 2023 Fabian Blatz <fabianblatz@gmail.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_MODULES_LVGL_LVGL_KEYPAD_INPUT_H_
#define ZEPHYR_MODULES_LVGL_LVGL_KEYPAD_INPUT_H_
#include <zephyr/device.h>
#ifdef __cplusplus
extern "C" {
#endif
int lvgl_keypad_input_init(const struct device *dev);
#ifdef __cplusplus
}
#endif
#endif /* ZEPHYR_MODULES_LVGL_LVGL_KEYPAD_INPUT_H_ */

5
modules/lvgl/input/lvgl_common_input.c
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@ -12,6 +12,7 @@
#include "lvgl_pointer_input.h"
#include "lvgl_button_input.h"
#include "lvgl_encoder_input.h"
#include "lvgl_keypad_input.h"
LOG_MODULE_DECLARE(lvgl, CONFIG_LV_Z_LOG_LEVEL);
@ -90,5 +91,9 @@ int lvgl_init_input_devices(void)
lvgl_encoder_input_init);
#endif /* CONFIG_LV_Z_ENCODER_INPUT */
#ifdef CONFIG_LV_Z_KEYPAD_INPUT
DT_FOREACH_STATUS_OKAY_VARGS(zephyr_lvgl_keypad_input, LV_DEV_INIT, lvgl_keypad_input_init);
#endif /* CONFIG_LV_Z_KEYPAD_INPUT */
return 0;
}

75
modules/lvgl/input/lvgl_keypad_input.c Normal file
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@ -0,0 +1,75 @@
/*
* Copyright 2023 Fabian Blatz <fabianblatz@gmail.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT zephyr_lvgl_keypad_input
#include "lvgl_common_input.h"
#include "lvgl_keypad_input.h"
#include <zephyr/sys/util.h>
#include <zephyr/logging/log.h>
LOG_MODULE_DECLARE(lvgl);
struct lvgl_keypad_input_config {
struct lvgl_common_input_config common_config; /* Needs to be first member */
const uint16_t *input_codes;
const uint16_t *lvgl_codes;
uint8_t num_codes;
};
static void lvgl_keypad_process_event(const struct device *dev, struct input_event *evt)
{
struct lvgl_common_input_data *data = dev->data;
const struct lvgl_keypad_input_config *cfg = dev->config;
uint8_t i;
for (i = 0; i < cfg->num_codes; i++) {
if (evt->code == cfg->input_codes[i]) {
data->pending_event.key = cfg->lvgl_codes[i];
break;
}
}
if (i == cfg->num_codes) {
LOG_WRN("Ignored input event: %u", evt->code);
return;
}
data->pending_event.state = evt->value ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL;
if (k_msgq_put(cfg->common_config.event_msgq, &data->pending_event,
K_NO_WAIT) != 0) {
LOG_WRN("Could not put input data into keypad queue");
}
}
int lvgl_keypad_input_init(const struct device *dev)
{
return lvgl_input_register_driver(LV_INDEV_TYPE_KEYPAD, dev);
}
#define ASSERT_PROPERTIES(inst) \
BUILD_ASSERT(DT_INST_PROP_LEN(inst, input_codes) == DT_INST_PROP_LEN(inst, lvgl_codes), \
"Property input-codes must have the same length as lvgl-codes.");
#define LVGL_KEYPAD_INPUT_DEFINE(inst) \
ASSERT_PROPERTIES(inst); \
LVGL_INPUT_DEFINE(inst, keypad, CONFIG_LV_Z_KEYPAD_INPUT_MSGQ_COUNT, \
lvgl_keypad_process_event); \
static const uint16_t lvgl_keypad_input_codes_##inst[] = DT_INST_PROP(inst, input_codes); \
static const uint16_t lvgl_keypad_lvgl_codes_##inst[] = DT_INST_PROP(inst, lvgl_codes); \
static const struct lvgl_keypad_input_config lvgl_keypad_input_config_##inst = { \
.common_config.event_msgq = &LVGL_INPUT_EVENT_MSGQ(inst, keypad), \
.input_codes = lvgl_keypad_input_codes_##inst, \
.lvgl_codes = lvgl_keypad_lvgl_codes_##inst, \
.num_codes = DT_INST_PROP_LEN(inst, input_codes), \
}; \
static struct lvgl_common_input_data lvgl_common_input_data_##inst; \
DEVICE_DT_INST_DEFINE(inst, NULL, NULL, &lvgl_common_input_data_##inst, \
&lvgl_keypad_input_config_##inst, POST_KERNEL, \
CONFIG_INPUT_INIT_PRIORITY, NULL);
DT_INST_FOREACH_STATUS_OKAY(LVGL_KEYPAD_INPUT_DEFINE)