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Diffstat (limited to '')
| -rw-r--r-- | ui.cpp | 222 |
1 files changed, 222 insertions, 0 deletions
@@ -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; +} |