input: add a longpress device
Add an input device to take input key events as an input and generates short press or long press devices as output. Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
This commit is contained in:
Fabio Baltieri
Fabio Baltieri
parent
12b863067c
commit
5b36b4fa16
4 changed files with 216 additions and 0 deletions
68
dts/bindings/input/zephyr,input-longpress.yaml
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68
dts/bindings/input/zephyr,input-longpress.yaml
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@ -0,0 +1,68 @@
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# Copyright 2023 Google LLC
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# SPDX-License-Identifier: Apache-2.0
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description: |
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Input longpress pseudo-device
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Listens for key events as an input and produces key events as output
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corresponding to short and long press.
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Can be optionally be associated to a specific device to listen for events
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only from that device. Example configuration:
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longpress {
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input = <&buttons>;
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compatible = "zephyr,input-longpress";
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input-codes = <INPUT_KEY_0>, <INPUT_KEY_1>;
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short-codes = <INPUT_KEY_A>, <INPUT_KEY_B>;
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long-codes = <INPUT_KEY_X>, <INPUT_KEY_Y>;
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long-delay-ms = <1000>;
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};
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Example output:
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input event: dev=buttons SYN type= 1 code= 11 value=1 # INPUT_KEY_0 press
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# release before one second
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input event: dev=buttons SYN type= 1 code= 11 value=0 # INPUT_KEY_0 release
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input event: dev=longpress SYN type= 1 code= 30 value=1 # INPUT_KEY_A press
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input event: dev=longpress SYN type= 1 code= 30 value=0 # INPUT_KEY_A release
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input event: dev=buttons SYN type= 1 code= 11 value=1 # INPUT_KEY_0 press
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# hold for more than one second
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input event: dev=longpress SYN type= 1 code= 45 value=1 # INPUT_KEY_A press
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# wait for release
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input event: dev=buttons SYN type= 1 code= 11 value=0 # INPUT_KEY_0 release
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input event: dev=longpress SYN type= 1 code= 45 value=0 # INPUT_KEY_A release
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compatible: "zephyr,input-longpress"
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properties:
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input:
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type: phandle
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description: |
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Input device phandle, if not specified listen for input from all devices.
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input-codes:
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type: array
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required: true
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description: |
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Array of input event key codes (INPUT_KEY_* or INPUT_BTN_*).
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short-codes:
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type: array
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required: true
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description: |
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Array of key codes to be generated for short press (INPUT_KEY_* or
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INPUT_BTN_*).
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long-codes:
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type: array
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required: true
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description: |
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Array of key codes to be generated for long press (INPUT_KEY_* or
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INPUT_BTN_*).
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long-delay-ms:
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type: int
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required: true
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description: Time delay to register a long press in milliseconds.
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@ -3,3 +3,5 @@
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zephyr_library()
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zephyr_library_sources(input.c)
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zephyr_library_sources_ifdef(CONFIG_INPUT_LONGPRESS input_longpress.c)
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@ -67,4 +67,9 @@ config INPUT_THREAD_STACK_SIZE
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endif # INPUT_MODE_THREAD
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config INPUT_LONGPRESS
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bool "Input longpress"
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default y
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depends on DT_HAS_ZEPHYR_INPUT_LONGPRESS_ENABLED
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endif # INPUT
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141
subsys/input/input_longpress.c
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141
subsys/input/input_longpress.c
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/*
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* Copyright 2023 Google LLC
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT zephyr_input_longpress
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#include <zephyr/device.h>
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#include <zephyr/input/input.h>
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#include <zephyr/kernel.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(input_longpress, CONFIG_INPUT_LOG_LEVEL);
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struct longpress_config {
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const struct device *input_dev;
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const uint16_t *input_codes;
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const uint16_t *short_codes;
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const uint16_t *long_codes;
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uint32_t long_delays_ms;
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uint8_t num_codes;
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};
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struct longpress_data_entry {
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const struct device *dev;
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struct k_work_delayable work;
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uint8_t index;
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bool long_fired;
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};
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struct longpress_data {
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/* support data for every input code */
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struct longpress_data_entry *entries;
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};
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static void longpress_deferred(struct k_work *work)
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{
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struct longpress_data_entry *entry = CONTAINER_OF(
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work, struct longpress_data_entry, work);
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const struct device *dev = entry->dev;
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const struct longpress_config *cfg = dev->config;
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uint16_t code;
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code = cfg->long_codes[entry->index];
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input_report_key(dev, code, 1, true, K_FOREVER);
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entry->long_fired = true;
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}
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static void longpress_cb(const struct device *dev, struct input_event *evt)
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{
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const struct longpress_config *cfg = dev->config;
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struct longpress_data *data = dev->data;
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struct longpress_data_entry *entry;
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int i;
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if (evt->type != INPUT_EV_KEY) {
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return;
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}
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for (i = 0; i < cfg->num_codes; i++) {
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if (evt->code == cfg->input_codes[i]) {
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break;
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}
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}
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if (i == cfg->num_codes) {
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LOG_DBG("ignored code %d", evt->code);
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return;
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}
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entry = &data->entries[i];
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if (evt->value) {
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entry->long_fired = false;
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k_work_schedule(&entry->work, K_MSEC(cfg->long_delays_ms));
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} else {
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k_work_cancel_delayable(&entry->work);
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if (entry->long_fired) {
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input_report_key(dev, cfg->long_codes[i], 0, true, K_FOREVER);
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} else {
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input_report_key(dev, cfg->short_codes[i], 1, true, K_FOREVER);
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input_report_key(dev, cfg->short_codes[i], 0, true, K_FOREVER);
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}
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}
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}
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static int longpress_init(const struct device *dev)
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{
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const struct longpress_config *cfg = dev->config;
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struct longpress_data *data = dev->data;
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if (cfg->input_dev && !device_is_ready(cfg->input_dev)) {
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LOG_ERR("input device not ready");
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return -ENODEV;
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}
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for (int i = 0; i < cfg->num_codes; i++) {
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struct longpress_data_entry *entry = &data->entries[i];
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entry->dev = dev;
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entry->index = i;
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k_work_init_delayable(&entry->work, longpress_deferred);
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}
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return 0;
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}
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#define INPUT_LONGPRESS_DEFINE(inst) \
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BUILD_ASSERT(DT_INST_PROP_LEN(inst, input_codes) == \
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DT_INST_PROP_LEN(inst, short_codes)); \
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BUILD_ASSERT(DT_INST_PROP_LEN(inst, input_codes) == \
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DT_INST_PROP_LEN(inst, long_codes)); \
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static void longpress_cb_##inst(struct input_event *evt) \
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{ \
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longpress_cb(DEVICE_DT_INST_GET(inst), evt); \
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} \
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INPUT_LISTENER_CB_DEFINE(DEVICE_DT_GET_OR_NULL(DT_INST_PHANDLE(inst, input)), \
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longpress_cb_##inst); \
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static const uint16_t longpress_input_codes_##inst[] = DT_INST_PROP(inst, input_codes); \
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static const uint16_t longpress_short_codes_##inst[] = DT_INST_PROP(inst, short_codes); \
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static const uint16_t longpress_long_codes_##inst[] = DT_INST_PROP(inst, long_codes); \
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static const struct longpress_config longpress_config_##inst = { \
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.input_dev = DEVICE_DT_GET_OR_NULL(DT_INST_PHANDLE(inst, input)), \
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.input_codes = longpress_input_codes_##inst, \
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.short_codes = longpress_short_codes_##inst, \
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.long_codes = longpress_long_codes_##inst, \
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.num_codes = DT_INST_PROP_LEN(inst, input_codes), \
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.long_delays_ms = DT_INST_PROP(inst, long_delay_ms), \
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}; \
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static struct longpress_data_entry longpress_data_entries_##inst[DT_INST_PROP_LEN( \
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inst, input_codes)]; \
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static struct longpress_data longpress_data_##inst = { \
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.entries = longpress_data_entries_##inst, \
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}; \
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DEVICE_DT_INST_DEFINE(inst, longpress_init, NULL, \
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&longpress_data_##inst, &longpress_config_##inst, \
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APPLICATION, CONFIG_INPUT_INIT_PRIORITY, NULL);
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DT_INST_FOREACH_STATUS_OKAY(INPUT_LONGPRESS_DEFINE)
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