5d4d719064
A mouse click is defined as pressing the mouse and then releasing it over a given spot. Add a function the tracks the mouse state and returns the most recent mouse click, if any. Signed-off-by: Simon Glass <sjg@chromium.org>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2019 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <dm.h>
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#include <errno.h>
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#include <mouse.h>
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int mouse_get_event(struct udevice *dev, struct mouse_event *evt)
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{
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struct mouse_ops *ops = mouse_get_ops(dev);
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int ret;
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if (!ops->get_event)
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return -ENOSYS;
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ret = ops->get_event(dev, evt);
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if (ret)
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return ret;
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return 0;
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}
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int mouse_get_click(struct udevice *dev, int *xp, int *yp)
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{
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struct mouse_uc_priv *uc_priv = dev_get_uclass_priv(dev);
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struct mouse_event event;
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int ret;
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/* Get one mouse event */
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ret = mouse_get_event(dev, &event);
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if (ret)
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return -EAGAIN; /* No event available */
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/* Only process button events for left button */
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if (event.type == MOUSE_EV_BUTTON &&
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event.button.button == BUTTON_LEFT) {
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enum mouse_press_state_t new_state = event.button.press_state;
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bool pending = false;
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/* Detect press->release transition (click) */
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if (uc_priv->left_button_state == BUTTON_PRESSED &&
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new_state == BUTTON_RELEASED) {
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pending = true;
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uc_priv->click_x = event.button.x;
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uc_priv->click_y = event.button.y;
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}
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/* Update button state */
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uc_priv->left_button_state = new_state;
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/* If we just detected a click, return it */
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if (pending) {
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if (xp)
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*xp = uc_priv->click_x;
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if (yp)
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*yp = uc_priv->click_y;
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return 0;
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}
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}
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return -EAGAIN;
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}
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UCLASS_DRIVER(mouse) = {
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.id = UCLASS_MOUSE,
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.name = "mouse",
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.per_device_auto = sizeof(struct mouse_uc_priv),
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};
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