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input: add zephyr,lvgl-button-input device binding

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Add a pseudo device which can be used to hook into gpio-keys input_events
and relay the events to a lv_indev.

Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>
This commit is contained in:
Fabian Blatz 2023-07-28 11:27:15 +02:00 • committed by Carles Cufí
commit b296d1152f
4 changed files with 137 additions and 1 deletions
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36
dts/bindings/input/zephyr,lvgl-button-input.yaml Normal file
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@ -0,0 +1,36 @@
# Copyright 2023 Fabian Blatz <fabianblatz@gmail.com>
# SPDX-License-Identifier: Apache-2.0
description: |
LVGL button indev pseudo-device
Listens for button input events and routes the
lv_indev_data_t to the underlying button lv_indev_t managed by LVGL.
Example configuration:
pointer {
compatible = "zephyr,lvgl-button-input";
input = <&buttons>;
input-codes = <INPUT_KEY_0 INPUT_KEY_1>;
coordinates = <120 220>, <150 250>;
};
When the device receives an input_event with code INPUT_KEY_0
a click event will be performed at (120,220).
compatible: "zephyr,lvgl-button-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_*).
coordinates:
type: array
description: |
Array of points (x,y) the associated input-code is mapped to.

3
modules/lvgl/CMakeLists.txt
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@ -222,10 +222,11 @@ zephyr_library_sources(
zephyr_library_sources_ifdef(CONFIG_LV_Z_USE_FILESYSTEM lvgl_fs.c)
zephyr_library_sources_ifdef(CONFIG_LV_Z_MEM_POOL_SYS_HEAP lvgl_mem.c)
zephyr_library_sources_ifdef(CONFIG_LV_Z_SHELL lvgl_shell.c)
zephyr_library_sources_ifdef(CONFIG_LV_Z_POINTER_KSCAN input/lvgl_kscan_pointer.c)
zephyr_library_sources(input/lvgl_common_input.c)
zephyr_library_sources_ifdef(CONFIG_LV_Z_POINTER_KSCAN input/lvgl_pointer_kscan.c)
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_link_libraries(LVGL)
target_link_libraries(LVGL INTERFACE zephyr_interface)

13
modules/lvgl/Kconfig.input
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@ -55,4 +55,17 @@ config LV_Z_POINTER_INPUT_MSGQ_COUNT
help
Size of the pointer message queue buffering input events.
config LV_Z_BUTTON_INPUT
bool "Input lvgl button"
default y
depends on INPUT
depends on DT_HAS_ZEPHYR_LVGL_BUTTON_INPUT_ENABLED
config LV_Z_BUTTON_INPUT_MSGQ_COUNT
int "Input button queue message count"
default 4
depends on LV_Z_BUTTON_INPUT
help
Size of the button message queue buffering input events.
endmenu

86
modules/lvgl/input/lvgl_button_input.c Normal file
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@ -0,0 +1,86 @@
/*
* Copyright 2023 Fabian Blatz <fabianblatz@gmail.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT zephyr_lvgl_button_input
#include "lvgl_common_input.h"
#include <zephyr/logging/log.h>
LOG_MODULE_DECLARE(lvgl);
struct lvgl_button_input_config {
struct lvgl_common_input_config common_config; /* Needs to be first member */
const uint16_t *input_codes;
uint8_t num_codes;
const lv_coord_t *coordinates;
};
static void lvgl_button_process_event(const struct device *dev, struct input_event *evt)
{
struct lvgl_common_input_data *data = dev->data;
const struct lvgl_button_input_config *cfg = dev->config;
uint8_t i;
for (i = 0; i < cfg->num_codes; i++) {
if (evt->code == cfg->input_codes[i]) {
break;
}
}
if (i == cfg->num_codes) {
LOG_DBG("Ignored input event: %u", evt->code);
return;
}
data->pending_event.btn_id = i;
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 queue");
}
}
static int lvgl_button_input_init(const struct device *dev)
{
struct lvgl_common_input_data *data = dev->data;
const struct lvgl_button_input_config *cfg = dev->config;
int ret;
ret = lvgl_input_register_driver(LV_INDEV_TYPE_BUTTON, dev);
if (ret < 0) {
return ret;
}
lv_indev_set_button_points(data->indev, (const lv_point_t *)cfg->coordinates);
return ret;
}
#define ASSERT_PROPERTIES(inst) \
BUILD_ASSERT(DT_INST_PROP_LEN(inst, input_codes) * 2 == \
DT_INST_PROP_LEN(inst, coordinates), \
"Property coordinates must contain one coordinate per input-code.")
#define LVGL_BUTTON_INPUT_DEFINE(inst) \
ASSERT_PROPERTIES(inst); \
LVGL_INPUT_DEFINE(inst, button, CONFIG_LV_Z_BUTTON_INPUT_MSGQ_COUNT, \
lvgl_button_process_event); \
static const uint16_t lvgl_button_input_codes_##inst[] = DT_INST_PROP(inst, input_codes); \
static const lv_coord_t lvgl_button_coordinates_##inst[] = \
DT_INST_PROP(inst, coordinates); \
static const struct lvgl_button_input_config lvgl_button_input_config_##inst = { \
.common_config.event_msgq = &LVGL_INPUT_EVENT_MSGQ(inst, button), \
.input_codes = lvgl_button_input_codes_##inst, \
.num_codes = DT_INST_PROP_LEN(inst, input_codes), \
.coordinates = lvgl_button_coordinates_##inst, \
}; \
static struct lvgl_common_input_data lvgl_common_input_data_##inst; \
DEVICE_DT_INST_DEFINE(inst, lvgl_button_input_init, NULL, &lvgl_common_input_data_##inst, \
&lvgl_button_input_config_##inst, APPLICATION, \
CONFIG_LV_Z_INPUT_INIT_PRIORITY, NULL);
DT_INST_FOREACH_STATUS_OKAY(LVGL_BUTTON_INPUT_DEFINE)