New kernel drivers and device implementation updates (#561)
- Added modular device support and devicetree bindings for ILI9341, ILI9488, CST816S, XPT2046, and GPIO button input, updating several board configurations for display/touch/backlight/keyboard/battery. - Added a setting to control deprecated HAL usage (device property + Kconfig).
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Ken Van Hoeylandt
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// SPDX-License-Identifier: Apache-2.0
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#include <drivers/button_control.h>
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#include <button_control_module.h>
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#include <tactility/device.h>
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#include <tactility/driver.h>
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#include <tactility/drivers/gpio_controller.h>
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#include <tactility/drivers/keyboard.h>
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#include <tactility/error.h>
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#include <tactility/log.h>
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#include <tactility/time.h>
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#include <lvgl.h>
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#include <cstdlib>
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#define TAG "ButtonControl"
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#define GET_CONFIG(device) (static_cast<const ButtonControlConfig*>((device)->config))
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// Worst case: both buttons complete a short/long press gesture (press + release, 2 events each)
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// within the same read_key() polling interval.
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constexpr auto BUTTON_CONTROL_PENDING_CAPACITY = 4;
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struct ButtonControlPendingEvent {
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uint32_t key;
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bool pressed;
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};
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struct ButtonControlButtonState {
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GpioDescriptor* descriptor;
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bool in_use;
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bool debounced_pressed;
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uint32_t press_start_time;
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uint32_t last_change_time;
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uint32_t short_press_key;
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uint32_t long_press_key;
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};
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struct ButtonControlInternal {
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ButtonControlButtonState primary;
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ButtonControlButtonState secondary;
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ButtonControlPendingEvent pending[BUTTON_CONTROL_PENDING_CAPACITY];
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uint8_t pending_head;
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uint8_t pending_count;
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};
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static void push_pending(ButtonControlInternal* internal, uint32_t key, bool pressed) {
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if (internal->pending_count >= BUTTON_CONTROL_PENDING_CAPACITY) {
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LOG_W(TAG, "Pending event queue full, dropping event");
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return;
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}
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uint8_t tail = (internal->pending_head + internal->pending_count) % BUTTON_CONTROL_PENDING_CAPACITY;
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internal->pending[tail] = { .key = key, .pressed = pressed };
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internal->pending_count++;
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}
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static bool pop_pending(ButtonControlInternal* internal, ButtonControlPendingEvent* out_event) {
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if (internal->pending_count == 0) {
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return false;
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}
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*out_event = internal->pending[internal->pending_head];
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internal->pending_head = (internal->pending_head + 1) % BUTTON_CONTROL_PENDING_CAPACITY;
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internal->pending_count--;
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return true;
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}
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// region Driver lifecycle
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static error_t acquire_button(const GpioPinSpec& pin, uint32_t short_press_key, uint32_t long_press_key, ButtonControlButtonState* out_state) {
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if (pin.gpio_controller == nullptr) {
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*out_state = {};
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return ERROR_NONE;
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}
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auto* descriptor = gpio_descriptor_acquire(pin.gpio_controller, pin.pin, GPIO_OWNER_GPIO);
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if (descriptor == nullptr) {
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LOG_E(TAG, "Failed to acquire GPIO descriptor");
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return ERROR_RESOURCE;
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}
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if (gpio_descriptor_set_flags(descriptor, pin.flags | GPIO_FLAG_DIRECTION_INPUT) != ERROR_NONE) {
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LOG_E(TAG, "Failed to configure GPIO as input");
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gpio_descriptor_release(descriptor);
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return ERROR_RESOURCE;
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}
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*out_state = {
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.descriptor = descriptor,
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.in_use = true,
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.debounced_pressed = false,
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.press_start_time = 0,
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.last_change_time = 0,
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.short_press_key = short_press_key,
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.long_press_key = long_press_key,
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};
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return ERROR_NONE;
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}
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static error_t start(Device* device) {
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const auto* config = GET_CONFIG(device);
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auto* internal = static_cast<ButtonControlInternal*>(malloc(sizeof(ButtonControlInternal)));
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if (internal == nullptr) {
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return ERROR_OUT_OF_MEMORY;
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}
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*internal = {};
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bool two_button_mode = config->pin_secondary.gpio_controller != nullptr;
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error_t error = acquire_button(
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config->pin_primary,
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two_button_mode ? LV_KEY_ENTER : LV_KEY_NEXT,
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two_button_mode ? LV_KEY_ESC : LV_KEY_ENTER,
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&internal->primary
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);
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if (error != ERROR_NONE) {
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free(internal);
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return error;
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}
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error = acquire_button(config->pin_secondary, LV_KEY_NEXT, LV_KEY_PREV, &internal->secondary);
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if (error != ERROR_NONE) {
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if (internal->primary.in_use) {
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gpio_descriptor_release(internal->primary.descriptor);
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}
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free(internal);
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return error;
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}
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device_set_driver_data(device, internal);
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return ERROR_NONE;
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}
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static error_t stop(Device* device) {
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auto* internal = static_cast<ButtonControlInternal*>(device_get_driver_data(device));
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if (internal->primary.in_use) {
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gpio_descriptor_release(internal->primary.descriptor);
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}
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if (internal->secondary.in_use) {
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gpio_descriptor_release(internal->secondary.descriptor);
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}
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free(internal);
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return ERROR_NONE;
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}
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// endregion
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// region KeyboardApi
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// Long press is only distinguished from short press at release time, by how long the button
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// was held - not at the moment it's first pressed. This matches physical button behavior:
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// you can't know a press is "long" until it either ends or the threshold is reached.
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static void poll_button(const ButtonControlConfig* config, ButtonControlInternal* internal, ButtonControlButtonState* state) {
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if (!state->in_use) {
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return;
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}
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bool high = false;
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if (gpio_descriptor_get_level(state->descriptor, &high) != ERROR_NONE) {
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return;
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}
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bool raw_pressed = config->active_low ? !high : high;
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uint32_t now = get_millis();
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if ((now - state->last_change_time) < config->debounce_ms) {
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return;
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}
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if (raw_pressed == state->debounced_pressed) {
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return;
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}
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state->last_change_time = now;
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state->debounced_pressed = raw_pressed;
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if (raw_pressed) {
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state->press_start_time = now;
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return;
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}
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// Release: decide short vs. long press by elapsed hold duration, then queue a synthetic
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// key tap (press followed by release) for the LVGL key this gesture maps to.
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uint32_t held_ms = now - state->press_start_time;
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uint32_t key = held_ms < config->long_press_ms ? state->short_press_key : state->long_press_key;
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push_pending(internal, key, true);
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push_pending(internal, key, false);
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}
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static error_t button_control_read_key(Device* device, KeyboardKeyData* data) {
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const auto* config = GET_CONFIG(device);
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auto* internal = static_cast<ButtonControlInternal*>(device_get_driver_data(device));
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poll_button(config, internal, &internal->primary);
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poll_button(config, internal, &internal->secondary);
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ButtonControlPendingEvent event;
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if (pop_pending(internal, &event)) {
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data->key = event.key;
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data->pressed = event.pressed;
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data->continue_reading = internal->pending_count > 0;
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} else {
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data->key = 0;
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data->pressed = false;
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data->continue_reading = false;
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}
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return ERROR_NONE;
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}
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// endregion
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static constexpr KeyboardApi button_control_api = {
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.read_key = button_control_read_key,
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};
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Driver button_control_driver = {
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.name = "button_control",
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.compatible = (const char*[]) { "tactility,button-control", nullptr },
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.start_device = start,
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.stop_device = stop,
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.api = &button_control_api,
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.device_type = &KEYBOARD_TYPE,
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.owner = &button_control_module,
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.internal = nullptr
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};
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