From 2497c1392b81e093f4de2541a98746aebd449a7f Mon Sep 17 00:00:00 2001
From: Peter Wu <lekensteyn@gmail.com>
Date: Wed, 26 Sep 2012 15:04:18 +0200
Subject: Initial commit

---
 rkbd/Makefile |   9 +++++
 rkbd/rkbd.cpp | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 rkbd/uinput.c |  90 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 227 insertions(+)
 create mode 100644 rkbd/Makefile
 create mode 100644 rkbd/rkbd.cpp
 create mode 100644 rkbd/uinput.c

(limited to 'rkbd')

diff --git a/rkbd/Makefile b/rkbd/Makefile
new file mode 100644
index 0000000..f87a6c5
--- /dev/null
+++ b/rkbd/Makefile
@@ -0,0 +1,9 @@
+LDFLAGS := $(shell pkg-config --libs QtGui) -lrt
+CPPFLAGS := -Wall $(shell pkg-config --cflags QtGui)
+
+obj := rkbd
+
+$(obj): $(obj).cpp
+	g++ -o $@ $(CPPFLAGS) $< $(LDFLAGS)
+clean:
+	rm $(obj)
diff --git a/rkbd/rkbd.cpp b/rkbd/rkbd.cpp
new file mode 100644
index 0000000..62e6fea
--- /dev/null
+++ b/rkbd/rkbd.cpp
@@ -0,0 +1,128 @@
+#include <QtGui>
+#include <iostream>
+#include <time.h>
+
+int keys[] = {
+	Qt::Key_Z, /* prev wep */
+	Qt::Key_X, /* next wep */
+	Qt::Key_Space, /* shoot */
+	Qt::Key_Up,
+	Qt::Key_Left,
+	Qt::Key_Down,
+	Qt::Key_Right,
+	Qt::Key_P,
+	Qt::Key_Backspace,
+};
+
+std::string key_names[] = {
+	"Z",
+	"X",
+	"Space",
+	"Up",
+	"Left",
+	"Down",
+	"Right",
+	"Pause",
+	"Backspace",
+};
+
+#define ARRAY_SIZE(a) (sizeof (a) / sizeof *(a) )
+
+class Application: public QApplication {
+public:
+	Application(int argc, char **argv): QApplication(argc, argv) {
+		setbuf(stdout, NULL); /* disable buffering */
+	}
+	~Application(){}
+	bool notify(QObject *object, QEvent *event) {
+		bool is_pressed = event->type() == QEvent::KeyPress;
+		if (is_pressed || event->type() == QEvent::KeyRelease) {
+			if (handle_key(static_cast<QKeyEvent *>(event)->key(), is_pressed))
+				return true;
+		}
+		return object->event(event);
+	}
+private:
+	bool handle_key(int code, bool is_pressed) {
+		for (unsigned int i=0; i<ARRAY_SIZE(keys); ++i) {
+			if (keys[i] == code) {
+				report_key(i + 1, is_pressed);
+				return true;
+			}
+		}
+		if (code == Qt::Key_Shift) {
+			release_key();
+			return true;
+		}
+		if (code == Qt::Key_Escape) {
+			std::cerr << "Escape received - quitting" << std::endl;
+			quit();
+		}
+		return false;
+	}
+	int getMS() {
+		struct timespec ts;
+		if (clock_gettime(CLOCK_MONOTONIC, &ts)) {
+			perror("clock_gettime");
+			return 0;
+		}
+		return (ts.tv_sec * 1000) + ts.tv_nsec / 1000000;
+	}
+	int last_code;
+	bool last_is_pressed;
+	//int last_time;
+	void release_key() {
+		if (last_code && last_is_pressed) {
+			send_key(last_code, false);
+			last_is_pressed = false;
+		}
+	}
+	bool always_send_key(int key) {
+		if (!key) return false;
+		switch (keys[key - 1]) {
+		case Qt::Key_Up:
+		case Qt::Key_Down:
+		case Qt::Key_Left:
+		case Qt::Key_Right:
+			return false;
+		}
+		return true;
+	}
+	void report_key(int key, bool is_pressed) {
+		//int timestamp = getMS();
+		//bool timed_out = timestamp - last_time >= 300;
+		if (last_code == key && !always_send_key(key)) {
+			if ((is_pressed == last_is_pressed) || 
+				(last_is_pressed && !is_pressed)) {
+				//if (!timed_out) {
+					return;
+				//}
+			}
+		} else {
+			if (!always_send_key(last_code))
+				release_key();
+		}
+		last_code = key;
+		last_is_pressed = is_pressed;
+		//last_time = timestamp;
+
+		send_key(key, is_pressed);
+	}
+	void send_key(int key, bool is_pressed) {
+		printf("%u %u\n", key, is_pressed);
+		if (is_pressed)
+			std::cerr << key_names[key - 1] << " " << (is_pressed ? "pressed" : "released") << std::endl;
+	}
+};
+
+
+int main(int argc, char **argv) {
+	Application app(argc, argv);
+
+	QWidget window;
+	window.resize(250, 150);
+	window.setWindowTitle("Remote keyboard");
+	window.show();
+
+	return app.exec();
+}
diff --git a/rkbd/uinput.c b/rkbd/uinput.c
new file mode 100644
index 0000000..5704679
--- /dev/null
+++ b/rkbd/uinput.c
@@ -0,0 +1,90 @@
+#include <linux/input.h>
+#include <linux/uinput.h>
+#include <fcntl.h> 
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h> /* memset */
+#include <stdlib.h> /* EXIT_FAILURE */
+
+int keys[] = {
+	KEY_Q, /* prev */
+	KEY_E, /* next */
+	KEY_Z, /* shoot */
+	KEY_W,
+	KEY_A,
+	KEY_S,
+	KEY_D,
+	KEY_P, /* pause */
+	KEY_BACKSPACE, /* really "backspace" */
+};
+
+#define ARRAY_SIZE(a) (sizeof (a) / sizeof *(a) )
+
+int main() {
+	int i;
+	int fd = open("/dev/uinput", O_WRONLY);
+	if (fd < 0) {
+		perror("open");
+		return 1;
+	}
+	if (ioctl(fd, UI_SET_EVBIT, EV_KEY) < 0) {
+		perror("Cannot set EV_KEY bit");
+		goto err_close;
+	}
+	if (ioctl(fd, UI_SET_EVBIT, EV_SYN) < 0) {
+		perror("Cannot set EV_SYN bit");
+		goto err_close;
+	}
+	for (i = 0; i < ARRAY_SIZE(keys); ++i) {
+		if (ioctl(fd, UI_SET_KEYBIT, keys[i]) < 0) {
+			perror("SET_KEYBIT");
+			goto err_close;
+		}
+	}
+
+	struct uinput_user_dev uidev;
+	memset(&uidev, 0, sizeof(uidev));
+	snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "Boxhead");
+	if (write(fd, &uidev, sizeof(uidev)) < 0) {
+		perror("write uinput struct");
+		goto err_close;
+	}
+
+	if (ioctl(fd, UI_DEV_CREATE) < 0) {
+		perror("UI_DEV_CREATE");
+		goto err_close;
+	}
+
+	unsigned int code, is_pressed;
+	printf("Waiting for input...\n");
+	struct input_event ev;
+	memset(&ev, 0, sizeof(ev));
+	while (scanf("%u %u", &code, &is_pressed) == 2) {
+		if (code >= 1 && code <= ARRAY_SIZE(keys)) {
+			ev.type = EV_KEY;
+			ev.code = keys[code - 1];
+			ev.value = !!is_pressed;
+			//printf("code=%u value=%u\n", ev.code, ev.value);
+			if (write(fd, &ev, sizeof(ev)) < 0)
+				perror("write key");
+			/* input_sync() */
+			ev.type = EV_SYN;
+			ev.code = SYN_REPORT;
+			ev.value = 0;
+			if (write(fd, &ev, sizeof(ev)) < 0)
+				perror("write sync");
+		} else {
+			fprintf(stderr, "Unexpected key: %u (%#02x)\n", code, code);
+			break;
+		}
+	}
+	if (ioctl(fd, UI_DEV_DESTROY) < 0)
+		perror("Cannot destroy device");
+	if (close(fd) < 0)
+		perror("close");
+	return 0;
+err_close:
+	if (close(fd) < 0)
+		perror("close");
+	return EXIT_FAILURE;
+}
-- 
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