minui/events.cpp - platform_bootable_recovery - Gitiles

 /*
  * Copyright (C) 2007 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 <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/input.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/epoll.h>
 #include <sys/inotify.h>
 #include <sys/ioctl.h>
 #include <unistd.h>

 #include <functional>

 #include "minui/minui.h"

 #define MAX_DEVICES 16
 #define MAX_MISC_FDS 16

 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
 #define BITS_TO_LONGS(x) (((x) + BITS_PER_LONG - 1) / BITS_PER_LONG)

 struct fd_info {
   int fd;
   ev_callback cb;
 };

 static ev_callback saved_input_cb;
 static int g_epoll_fd;
 static int g_inotify_fd;
 static epoll_event polledevents[MAX_DEVICES + MAX_MISC_FDS];
 static int npolledevents;

 static fd_info ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];

 static unsigned ev_count = 0;
 static unsigned ev_dev_count = 0;
 static unsigned ev_misc_count = 0;

 static bool test_bit(size_t bit, unsigned long* array) { // NOLINT
     return (array[bit/BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG))) != 0;
 }

 static int inotify_cb(int fd, __unused uint32_t epevents) {
   struct inotify_event* pevent;
   char* buf;
   DIR* dir;
   size_t event_len;
   size_t offset;

   if (saved_input_cb == nullptr) return -1;

   // The inotify will put one or several complete events.
   // Should not read part of one event.
   int ret = ioctl(fd, FIONREAD, &event_len);
   if (ret != 0) return -1;

   dir = opendir("/dev/input");
   if (dir == nullptr) return -1;

   buf = (char*)malloc(event_len);
   if (buf == nullptr) {
     closedir(dir);
     return -1;
   }

   ret = read(fd, buf, event_len);
   if (ret != (int)event_len) {
     free(buf);
     closedir(dir);
     return -1;
   }

   offset = 0;
   while (offset < event_len) {
     pevent = (struct inotify_event*)(buf + offset);
     if (offset + sizeof(inotify_event) + pevent->len > event_len) {
       // The pevent->len is too large and buffer will over flow.
       // In general, should not happen, just make more stable.
       free(buf);
       closedir(dir);
       return -1;
     }
     offset += sizeof(inotify_event) + pevent->len;

     pevent->name[pevent->len] = '\0';
     if (strncmp(pevent->name, "event", 5)) continue;

     int dfd = openat(dirfd(dir), pevent->name, O_RDONLY);
     if (dfd == -1) break;

     // Read the evbits of the input device.
     unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
     if (ioctl(dfd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
       close(dfd);
       continue;
     }
     // We assume that only EV_KEY, EV_REL, and EV_SW event types are ever needed.
     if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) {
       close(dfd);
       continue;
     }

     // Only add, we assume the user will not plug out and plug in USB device again and again :)
     ev_add_fd(dfd, saved_input_cb);
   }

   free(buf);
   closedir(dir);
   return 0;
 }

 int ev_init(ev_callback input_cb, bool allow_touch_inputs) {
   g_epoll_fd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
   if (g_epoll_fd == -1) {
     return -1;
   }

   g_inotify_fd = inotify_init();
   if (g_inotify_fd >= 0) {
     inotify_add_watch(g_inotify_fd, "/dev/input", IN_CREATE);
     ev_add_fd(g_inotify_fd, inotify_cb);
   }

   bool epollctlfail = false;
   DIR* dir = opendir("/dev/input");
   if (dir != nullptr) {
     dirent* de;
     while ((de = readdir(dir))) {
       if (strncmp(de->d_name, "event", 5)) continue;
       int fd = openat(dirfd(dir), de->d_name, O_RDONLY);
       if (fd == -1) continue;

       // Use unsigned long to match ioctl's parameter type.
       unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];  // NOLINT

       // Read the evbits of the input device.
       if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
         close(fd);
         continue;
       }

       // We assume that only EV_KEY, and EV_SW event types are ever needed. EV_ABS is also
       // allowed if allow_touch_inputs is set.
       // EV_REL should be enabled explicitly in device tree.
       if (!test_bit(EV_KEY, ev_bits) &&
 #ifdef BOARD_RECOVERY_NEEDS_REL_INPUT
           !test_bit(EV_REL, ev_bits) &&
 #endif
           !test_bit(EV_SW, ev_bits)) {
         if (!allow_touch_inputs || !test_bit(EV_ABS, ev_bits)) {
           close(fd);
           continue;
         }
       }

       epoll_event ev;
       ev.events = EPOLLIN | EPOLLWAKEUP;
       ev.data.ptr = &ev_fdinfo[ev_count];
       if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
         close(fd);
         epollctlfail = true;
         continue;
       }

       ev_fdinfo[ev_count].fd = fd;
       ev_fdinfo[ev_count].cb = input_cb;
       ev_count++;
       ev_dev_count++;
       if (ev_dev_count == MAX_DEVICES) break;
     }

     closedir(dir);
   }

   if (epollctlfail && !ev_count) {
     close(g_epoll_fd);
     g_epoll_fd = -1;
     return -1;
   }

   saved_input_cb = input_cb;

   return 0;
 }

 int ev_get_epollfd(void) {
     return g_epoll_fd;
 }

 int ev_add_fd(int fd, ev_callback cb) {
   if (ev_misc_count == MAX_MISC_FDS || cb == NULL) {
     return -1;
   }

   epoll_event ev;
   ev.events = EPOLLIN | EPOLLWAKEUP;
   ev.data.ptr = static_cast<void*>(&ev_fdinfo[ev_count]);
   int ret = epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev);
   if (!ret) {
     ev_fdinfo[ev_count].fd = fd;
     ev_fdinfo[ev_count].cb = std::move(cb);
     ev_count++;
     ev_misc_count++;
   }

   return ret;
 }

 void ev_exit(void) {
     while (ev_count > 0) {
         close(ev_fdinfo[--ev_count].fd);
     }
     ev_misc_count = 0;
     ev_dev_count = 0;
     saved_input_cb = nullptr;
     close(g_epoll_fd);
 }

 int ev_wait(int timeout) {
     npolledevents = epoll_wait(g_epoll_fd, polledevents, ev_count, timeout);
     if (npolledevents <= 0) {
         return -1;
     }
     return 0;
 }

 void ev_dispatch(void) {
   for (int n = 0; n < npolledevents; n++) {
     fd_info* fdi = static_cast<fd_info*>(polledevents[n].data.ptr);
     const ev_callback& cb = fdi->cb;
     if (cb) {
       cb(fdi->fd, polledevents[n].events);
     }
   }
 }

 int ev_get_input(int fd, uint32_t epevents, input_event* ev) {
     if (epevents & EPOLLIN) {
         ssize_t r = TEMP_FAILURE_RETRY(read(fd, ev, sizeof(*ev)));
         if (r == sizeof(*ev)) {
             return 0;
         }
     }
     return -1;
 }

 int ev_sync_key_state(const ev_set_key_callback& set_key_cb) {
   // Use unsigned long to match ioctl's parameter type.
   unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];    // NOLINT
   unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)];  // NOLINT

   for (size_t i = 0; i < ev_dev_count; ++i) {
     memset(ev_bits, 0, sizeof(ev_bits));
     memset(key_bits, 0, sizeof(key_bits));

     if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
       continue;
     }
     if (!test_bit(EV_KEY, ev_bits)) {
       continue;
     }
     if (ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits) == -1) {
       continue;
     }

     for (int code = 0; code <= KEY_MAX; code++) {
       if (test_bit(code, key_bits)) {
         set_key_cb(code, 1);
       }
     }
   }

   return 0;
 }

 void ev_iterate_available_keys(const std::function<void(int)>& f) {
     // Use unsigned long to match ioctl's parameter type.
     unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
     unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT

     for (size_t i = 0; i < ev_dev_count; ++i) {
         memset(ev_bits, 0, sizeof(ev_bits));
         memset(key_bits, 0, sizeof(key_bits));

         // Does this device even have keys?
         if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
             continue;
         }
         if (!test_bit(EV_KEY, ev_bits)) {
             continue;
         }

         int rc = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits);
         if (rc == -1) {
             continue;
         }

         for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
             if (test_bit(key_code, key_bits)) {
                 f(key_code);
             }
         }
     }
 }

 void ev_iterate_touch_inputs(const std::function<void(int)>& touch_device_detected,
                              const std::function<void(int)>& key_detected) {
   for (size_t i = 0; i < ev_dev_count; ++i) {
     // Use unsigned long to match ioctl's parameter type.
     unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)] = {};  // NOLINT
     if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
       continue;
     }
     if (!test_bit(EV_ABS, ev_bits)) {
       continue;
     }

     unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)] = {};  // NOLINT
     if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_ABS, KEY_MAX), key_bits) == -1) {
       continue;
     }

     touch_device_detected(ev_fdinfo[i].fd);

     for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
       if (test_bit(key_code, key_bits)) {
         key_detected(key_code);
       }
     }
   }
 }
	/*
	* Copyright (C) 2007 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 <dirent.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <linux/input.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/epoll.h>
	#include <sys/inotify.h>
	#include <sys/ioctl.h>
	#include <unistd.h>

	#include <functional>

	#include "minui/minui.h"

	#define MAX_DEVICES 16
	#define MAX_MISC_FDS 16

	#define BITS_PER_LONG (sizeof(unsigned long) * 8)
	#define BITS_TO_LONGS(x) (((x) + BITS_PER_LONG - 1) / BITS_PER_LONG)

	struct fd_info {
	int fd;
	ev_callback cb;
	};

	static ev_callback saved_input_cb;
	static int g_epoll_fd;
	static int g_inotify_fd;
	static epoll_event polledevents[MAX_DEVICES + MAX_MISC_FDS];
	static int npolledevents;

	static fd_info ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];

	static unsigned ev_count = 0;
	static unsigned ev_dev_count = 0;
	static unsigned ev_misc_count = 0;

	static bool test_bit(size_t bit, unsigned long* array) { // NOLINT
	return (array[bit/BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG))) != 0;
	}

	static int inotify_cb(int fd, __unused uint32_t epevents) {
	struct inotify_event* pevent;
	char* buf;
	DIR* dir;
	size_t event_len;
	size_t offset;

	if (saved_input_cb == nullptr) return -1;

	// The inotify will put one or several complete events.
	// Should not read part of one event.
	int ret = ioctl(fd, FIONREAD, &event_len);
	if (ret != 0) return -1;

	dir = opendir("/dev/input");
	if (dir == nullptr) return -1;

	buf = (char*)malloc(event_len);
	if (buf == nullptr) {
	closedir(dir);
	return -1;
	}

	ret = read(fd, buf, event_len);
	if (ret != (int)event_len) {
	free(buf);
	closedir(dir);
	return -1;
	}

	offset = 0;
	while (offset < event_len) {
	pevent = (struct inotify_event*)(buf + offset);
	if (offset + sizeof(inotify_event) + pevent->len > event_len) {
	// The pevent->len is too large and buffer will over flow.
	// In general, should not happen, just make more stable.
	free(buf);
	closedir(dir);
	return -1;
	}
	offset += sizeof(inotify_event) + pevent->len;

	pevent->name[pevent->len] = '\0';
	if (strncmp(pevent->name, "event", 5)) continue;

	int dfd = openat(dirfd(dir), pevent->name, O_RDONLY);
	if (dfd == -1) break;

	// Read the evbits of the input device.
	unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
	if (ioctl(dfd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
	close(dfd);
	continue;
	}
	// We assume that only EV_KEY, EV_REL, and EV_SW event types are ever needed.
	if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) {
	close(dfd);
	continue;
	}

	// Only add, we assume the user will not plug out and plug in USB device again and again :)
	ev_add_fd(dfd, saved_input_cb);
	}

	free(buf);
	closedir(dir);
	return 0;
	}

	int ev_init(ev_callback input_cb, bool allow_touch_inputs) {
	g_epoll_fd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
	if (g_epoll_fd == -1) {
	return -1;
	}

	g_inotify_fd = inotify_init();
	if (g_inotify_fd >= 0) {
	inotify_add_watch(g_inotify_fd, "/dev/input", IN_CREATE);
	ev_add_fd(g_inotify_fd, inotify_cb);
	}

	bool epollctlfail = false;
	DIR* dir = opendir("/dev/input");
	if (dir != nullptr) {
	dirent* de;
	while ((de = readdir(dir))) {
	if (strncmp(de->d_name, "event", 5)) continue;
	int fd = openat(dirfd(dir), de->d_name, O_RDONLY);
	if (fd == -1) continue;

	// Use unsigned long to match ioctl's parameter type.
	unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT

	// Read the evbits of the input device.
	if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
	close(fd);
	continue;
	}

	// We assume that only EV_KEY, and EV_SW event types are ever needed. EV_ABS is also
	// allowed if allow_touch_inputs is set.
	// EV_REL should be enabled explicitly in device tree.
	if (!test_bit(EV_KEY, ev_bits) &&
	#ifdef BOARD_RECOVERY_NEEDS_REL_INPUT
	!test_bit(EV_REL, ev_bits) &&
	#endif
	!test_bit(EV_SW, ev_bits)) {
	if (!allow_touch_inputs \|\| !test_bit(EV_ABS, ev_bits)) {
	close(fd);
	continue;
	}
	}

	epoll_event ev;
	ev.events = EPOLLIN \| EPOLLWAKEUP;
	ev.data.ptr = &ev_fdinfo[ev_count];
	if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
	close(fd);
	epollctlfail = true;
	continue;
	}

	ev_fdinfo[ev_count].fd = fd;
	ev_fdinfo[ev_count].cb = input_cb;
	ev_count++;
	ev_dev_count++;
	if (ev_dev_count == MAX_DEVICES) break;
	}

	closedir(dir);
	}

	if (epollctlfail && !ev_count) {
	close(g_epoll_fd);
	g_epoll_fd = -1;
	return -1;
	}

	saved_input_cb = input_cb;

	return 0;
	}

	int ev_get_epollfd(void) {
	return g_epoll_fd;
	}

	int ev_add_fd(int fd, ev_callback cb) {
	if (ev_misc_count == MAX_MISC_FDS \|\| cb == NULL) {
	return -1;
	}

	epoll_event ev;
	ev.events = EPOLLIN \| EPOLLWAKEUP;
	ev.data.ptr = static_cast<void*>(&ev_fdinfo[ev_count]);
	int ret = epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev);
	if (!ret) {
	ev_fdinfo[ev_count].fd = fd;
	ev_fdinfo[ev_count].cb = std::move(cb);
	ev_count++;
	ev_misc_count++;
	}

	return ret;
	}

	void ev_exit(void) {
	while (ev_count > 0) {
	close(ev_fdinfo[--ev_count].fd);
	}
	ev_misc_count = 0;
	ev_dev_count = 0;
	saved_input_cb = nullptr;
	close(g_epoll_fd);
	}

	int ev_wait(int timeout) {
	npolledevents = epoll_wait(g_epoll_fd, polledevents, ev_count, timeout);
	if (npolledevents <= 0) {
	return -1;
	}
	return 0;
	}

	void ev_dispatch(void) {
	for (int n = 0; n < npolledevents; n++) {
	fd_info* fdi = static_cast<fd_info*>(polledevents[n].data.ptr);
	const ev_callback& cb = fdi->cb;
	if (cb) {
	cb(fdi->fd, polledevents[n].events);
	}
	}
	}

	int ev_get_input(int fd, uint32_t epevents, input_event* ev) {
	if (epevents & EPOLLIN) {
	ssize_t r = TEMP_FAILURE_RETRY(read(fd, ev, sizeof(*ev)));
	if (r == sizeof(*ev)) {
	return 0;
	}
	}
	return -1;
	}

	int ev_sync_key_state(const ev_set_key_callback& set_key_cb) {
	// Use unsigned long to match ioctl's parameter type.
	unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
	unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT

	for (size_t i = 0; i < ev_dev_count; ++i) {
	memset(ev_bits, 0, sizeof(ev_bits));
	memset(key_bits, 0, sizeof(key_bits));

	if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
	continue;
	}
	if (!test_bit(EV_KEY, ev_bits)) {
	continue;
	}
	if (ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits) == -1) {
	continue;
	}

	for (int code = 0; code <= KEY_MAX; code++) {
	if (test_bit(code, key_bits)) {
	set_key_cb(code, 1);
	}
	}
	}

	return 0;
	}

	void ev_iterate_available_keys(const std::function<void(int)>& f) {
	// Use unsigned long to match ioctl's parameter type.
	unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
	unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT

	for (size_t i = 0; i < ev_dev_count; ++i) {
	memset(ev_bits, 0, sizeof(ev_bits));
	memset(key_bits, 0, sizeof(key_bits));

	// Does this device even have keys?
	if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
	continue;
	}
	if (!test_bit(EV_KEY, ev_bits)) {
	continue;
	}

	int rc = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits);
	if (rc == -1) {
	continue;
	}

	for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
	if (test_bit(key_code, key_bits)) {
	f(key_code);
	}
	}
	}
	}

	void ev_iterate_touch_inputs(const std::function<void(int)>& touch_device_detected,
	const std::function<void(int)>& key_detected) {
	for (size_t i = 0; i < ev_dev_count; ++i) {
	// Use unsigned long to match ioctl's parameter type.
	unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)] = {}; // NOLINT
	if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
	continue;
	}
	if (!test_bit(EV_ABS, ev_bits)) {
	continue;
	}

	unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)] = {}; // NOLINT
	if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_ABS, KEY_MAX), key_bits) == -1) {
	continue;
	}

	touch_device_detected(ev_fdinfo[i].fd);

	for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
	if (test_bit(key_code, key_bits)) {
	key_detected(key_code);
	}
	}
	}
	}