move key processing to RecoveryUI

Move the key for handling keys from ScreenRecoveryUI to RecoveryUI, so
it can be used by devices without screens.  Remove the UIParameters
struct and replace it with some new member variables in
ScreenRecoveryUI.

Change-Id: I70094ecbc4acbf76ce44d5b5ec2036c36bdc3414

1 files changed, 222 insertions, 0 deletions

diff --git a/ui.cpp b/ui.cpp
new file mode 100644
index 0000000..fd370a7
--- /dev/null
+++ b/ui.cpp
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/input.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <cutils/android_reboot.h>
+
+#include "common.h"
+#include "device.h"
+#include "minui/minui.h"
+#include "screen_ui.h"
+#include "ui.h"
+
+#define UI_WAIT_KEY_TIMEOUT_SEC    120
+
+// There's only (at most) one of these objects, and global callbacks
+// (for pthread_create, and the input event system) need to find it,
+// so use a global variable.
+static RecoveryUI* self = NULL;
+
+RecoveryUI::RecoveryUI() :
+    key_queue_len(0),
+    key_last_down(-1) {
+    pthread_mutex_init(&key_queue_mutex, NULL);
+    pthread_cond_init(&key_queue_cond, NULL);
+    self = this;
+}
+
+void RecoveryUI::Init() {
+    ev_init(input_callback, NULL);
+    pthread_create(&input_t, NULL, input_thread, NULL);
+}
+
+
+int RecoveryUI::input_callback(int fd, short revents, void* data)
+{
+    struct input_event ev;
+    int ret;
+
+    ret = ev_get_input(fd, revents, &ev);
+    if (ret)
+        return -1;
+
+    if (ev.type == EV_SYN) {
+        return 0;
+    } else if (ev.type == EV_REL) {
+        if (ev.code == REL_Y) {
+            // accumulate the up or down motion reported by
+            // the trackball.  When it exceeds a threshold
+            // (positive or negative), fake an up/down
+            // key event.
+            self->rel_sum += ev.value;
+            if (self->rel_sum > 3) {
+                self->process_key(KEY_DOWN, 1);   // press down key
+                self->process_key(KEY_DOWN, 0);   // and release it
+                self->rel_sum = 0;
+            } else if (self->rel_sum < -3) {
+                self->process_key(KEY_UP, 1);     // press up key
+                self->process_key(KEY_UP, 0);     // and release it
+                self->rel_sum = 0;
+            }
+        }
+    } else {
+        self->rel_sum = 0;
+    }
+
+    if (ev.type == EV_KEY && ev.code <= KEY_MAX)
+        self->process_key(ev.code, ev.value);
+
+    return 0;
+}
+
+// Process a key-up or -down event.  A key is "registered" when it is
+// pressed and then released, with no other keypresses or releases in
+// between.  Registered keys are passed to CheckKey() to see if it
+// should trigger a visibility toggle, an immediate reboot, or be
+// queued to be processed next time the foreground thread wants a key
+// (eg, for the menu).
+//
+// We also keep track of which keys are currently down so that
+// CheckKey can call IsKeyPressed to see what other keys are held when
+// a key is registered.
+//
+// updown == 1 for key down events; 0 for key up events
+void RecoveryUI::process_key(int key_code, int updown) {
+    bool register_key = false;
+
+    pthread_mutex_lock(&key_queue_mutex);
+    key_pressed[key_code] = updown;
+    if (updown) {
+        key_last_down = key_code;
+    } else {
+        if (key_last_down == key_code)
+            register_key = true;
+        key_last_down = -1;
+    }
+    pthread_mutex_unlock(&key_queue_mutex);
+
+    if (register_key) {
+        switch (CheckKey(key_code)) {
+          case RecoveryUI::TOGGLE:
+            ShowText(!IsTextVisible());
+            break;
+
+          case RecoveryUI::REBOOT:
+            android_reboot(ANDROID_RB_RESTART, 0, 0);
+            break;
+
+          case RecoveryUI::ENQUEUE:
+            pthread_mutex_lock(&key_queue_mutex);
+            const int queue_max = sizeof(key_queue) / sizeof(key_queue[0]);
+            if (key_queue_len < queue_max) {
+                key_queue[key_queue_len++] = key_code;
+                pthread_cond_signal(&key_queue_cond);
+            }
+            pthread_mutex_unlock(&key_queue_mutex);
+            break;
+        }
+    }
+}
+
+// Reads input events, handles special hot keys, and adds to the key queue.
+void* RecoveryUI::input_thread(void *cookie)
+{
+    for (;;) {
+        if (!ev_wait(-1))
+            ev_dispatch();
+    }
+    return NULL;
+}
+
+int RecoveryUI::WaitKey()
+{
+    pthread_mutex_lock(&key_queue_mutex);
+
+    // Time out after UI_WAIT_KEY_TIMEOUT_SEC, unless a USB cable is
+    // plugged in.
+    do {
+        struct timeval now;
+        struct timespec timeout;
+        gettimeofday(&now, NULL);
+        timeout.tv_sec = now.tv_sec;
+        timeout.tv_nsec = now.tv_usec * 1000;
+        timeout.tv_sec += UI_WAIT_KEY_TIMEOUT_SEC;
+
+        int rc = 0;
+        while (key_queue_len == 0 && rc != ETIMEDOUT) {
+            rc = pthread_cond_timedwait(&key_queue_cond, &key_queue_mutex,
+                                        &timeout);
+        }
+    } while (usb_connected() && key_queue_len == 0);
+
+    int key = -1;
+    if (key_queue_len > 0) {
+        key = key_queue[0];
+        memcpy(&key_queue[0], &key_queue[1], sizeof(int) * --key_queue_len);
+    }
+    pthread_mutex_unlock(&key_queue_mutex);
+    return key;
+}
+
+// Return true if USB is connected.
+bool RecoveryUI::usb_connected() {
+    int fd = open("/sys/class/android_usb/android0/state", O_RDONLY);
+    if (fd < 0) {
+        printf("failed to open /sys/class/android_usb/android0/state: %s\n",
+               strerror(errno));
+        return 0;
+    }
+
+    char buf;
+    /* USB is connected if android_usb state is CONNECTED or CONFIGURED */
+    int connected = (read(fd, &buf, 1) == 1) && (buf == 'C');
+    if (close(fd) < 0) {
+        printf("failed to close /sys/class/android_usb/android0/state: %s\n",
+               strerror(errno));
+    }
+    return connected;
+}
+
+bool RecoveryUI::IsKeyPressed(int key)
+{
+    pthread_mutex_lock(&key_queue_mutex);
+    int pressed = key_pressed[key];
+    pthread_mutex_unlock(&key_queue_mutex);
+    return pressed;
+}
+
+void RecoveryUI::FlushKeys() {
+    pthread_mutex_lock(&key_queue_mutex);
+    key_queue_len = 0;
+    pthread_mutex_unlock(&key_queue_mutex);
+}
+
+RecoveryUI::KeyAction RecoveryUI::CheckKey(int key) {
+    return RecoveryUI::ENQUEUE;
+}