mirror of
https://github.com/koreader/koreader
synced 2024-10-31 21:20:20 +00:00
364 lines
9.5 KiB
C
364 lines
9.5 KiB
C
/*
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KindlePDFViewer: input abstraction for Lua
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Copyright (C) 2011 Hans-Werner Hilse <hilse@web.de>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "popen-noshell/popen_noshell.h"
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#include <err.h>
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#include <stdio.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <linux/input.h>
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#ifdef EMULATE_READER
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#include <SDL.h>
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#endif
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#include "input.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#define CODE_IN_SAVER 10000
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#define CODE_OUT_SAVER 10001
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#define CODE_USB_PLUG_IN 10010
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#define CODE_USB_PLUG_OUT 10011
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#define CODE_CHARGING 10020
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#define CODE_NOT_CHARGING 10021
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#define NUM_FDS 4
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int inputfds[4] = { -1, -1, -1, -1 };
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#ifndef EMULATE_READER
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pid_t slider_pid = -1;
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struct popen_noshell_pass_to_pclose pclose_arg;
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void slider_handler(int sig)
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{
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/* Kill lipc-wait-event properly on exit */
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if(pclose_arg.pid != 0) {
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// Be a little more gracious, lipc seems to handle SIGINT properly
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kill(pclose_arg.pid, SIGINT);
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}
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}
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#else
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int is_in_touch = 0;
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static inline void genEmuEvent(lua_State *L, int fd, int type, int code, int value) {
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struct input_event input;
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input.type = type;
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input.code = code;
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input.value = value;
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gettimeofday(&input.time, NULL);
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if(write(fd, &input, sizeof(struct input_event)) == -1) {
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luaL_error(L, "Failed to generate emu event.\n");
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}
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return;
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}
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#endif
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int findFreeFdSlot() {
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int i;
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for(i=0; i<NUM_FDS; i++) {
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if(inputfds[i] == -1) {
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return i;
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}
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}
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return -1;
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}
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static int openInputDevice(lua_State *L) {
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const char* inputdevice = luaL_checkstring(L, 1);
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#ifndef EMULATE_READER
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int fd;
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int childpid;
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fd = findFreeFdSlot();
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if(fd == -1) {
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return luaL_error(L, "no free slot for new input device <%s>", inputdevice);
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}
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if(!strcmp("fake_events", inputdevice)) {
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/* special case: the power slider */
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int pipefd[2];
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pipe(pipefd);
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if((childpid = fork()) == -1) {
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return luaL_error(L, "cannot fork() slider event listener");
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}
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if(childpid == 0) {
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// We send a SIGTERM to this child on exit, trap it to kill lipc properly.
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signal(SIGTERM, slider_handler);
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FILE *fp;
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char std_out[256];
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int status;
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struct input_event ev;
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__u16 key_code = 10000;
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close(pipefd[0]);
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ev.type = EV_KEY;
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ev.code = key_code;
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ev.value = 1;
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/* listen power slider events (listen for ever for multiple events) */
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char *argv[] = {"lipc-wait-event", "-m", "-s", "0", "com.lab126.powerd", "goingToScreenSaver,outOfScreenSaver,charging,notCharging", (char *) NULL};
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/* @TODO 07.06 2012 (houqp)
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* plugin and out event can only be watched by:
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lipc-wait-event com.lab126.hal usbPlugOut,usbPlugIn
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*/
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fp = popen_noshell("lipc-wait-event", (const char * const *)argv, "r", &pclose_arg, 0);
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if (!fp) {
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err(EXIT_FAILURE, "popen_noshell()");
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}
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/* Flush to get rid of buffering issues? */
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fflush(fp);
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while(fgets(std_out, sizeof(std_out)-1, fp)) {
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if(std_out[0] == 'g') {
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ev.code = CODE_IN_SAVER;
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} else if(std_out[0] == 'o') {
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ev.code = CODE_OUT_SAVER;
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} else if((std_out[0] == 'u') && (std_out[7] == 'I')) {
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ev.code = CODE_USB_PLUG_IN;
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} else if((std_out[0] == 'u') && (std_out[7] == 'O')) {
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ev.code = CODE_USB_PLUG_OUT;
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} else if(std_out[0] == 'c') {
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ev.code = CODE_CHARGING;
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} else if(std_out[0] == 'n') {
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ev.code = CODE_NOT_CHARGING;
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} else {
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printf("Unrecognized event.\n");
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}
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/* fill event struct */
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gettimeofday(&ev.time, NULL);
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/* generate event */
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if(write(pipefd[1], &ev, sizeof(struct input_event)) == -1) {
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printf("Failed to generate event.\n");
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}
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}
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status = pclose_noshell(&pclose_arg);
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if (status == -1) {
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err(EXIT_FAILURE, "pclose_noshell()");
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} else {
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printf("lipc-wait-event exited with status %d.\n", status);
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if WIFEXITED(status) {
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printf("lipc-wait-event exited normally with status: %d.\n", WEXITSTATUS(status));
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}
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if WIFSIGNALED(status) {
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printf("lipc-wait-event terminated by signal: %d.\n", WTERMSIG(status));
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}
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}
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// We're done, go away :).
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_exit(EXIT_SUCCESS);
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} else {
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close(pipefd[1]);
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inputfds[fd] = pipefd[0];
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slider_pid = childpid;
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}
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} else {
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inputfds[fd] = open(inputdevice, O_RDONLY | O_NONBLOCK, 0);
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if(inputfds[fd] != -1) {
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ioctl(inputfds[fd], EVIOCGRAB, 1);
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return 0;
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} else {
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return luaL_error(L, "error opening input device <%s>: %d", inputdevice, errno);
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}
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}
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#else
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if(SDL_Init(SDL_INIT_VIDEO) < 0) {
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return luaL_error(L, "cannot initialize SDL.");
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}
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SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);
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/* we only use inputfds[0] in emu mode, because we only have one
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* fake device so far. */
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inputfds[0] = open(inputdevice, O_RDWR | O_NONBLOCK);
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if (inputfds < 0) {
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return luaL_error(L, "error opening input device <%s>: %d", inputdevice, errno);
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}
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#endif
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return 0;
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}
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static int closeInputDevices(lua_State *L) {
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int i;
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for(i=0; i<NUM_FDS; i++) {
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if(inputfds[i] != -1) {
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ioctl(inputfds[i], EVIOCGRAB, 0);
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close(inputfds[i]);
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}
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}
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#ifndef EMULATE_READER
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if(slider_pid != -1) {
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/* kill and wait for child process */
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kill(slider_pid, SIGTERM);
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waitpid(-1, NULL, 0);
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}
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return 0;
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#else
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close(inputfds[0]);
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SDL_Quit();
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return 0;
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#endif
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}
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static inline void set_event_table(lua_State *L, struct input_event input) {
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lua_newtable(L);
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lua_pushstring(L, "type");
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lua_pushinteger(L, (int) input.type);
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lua_settable(L, -3);
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lua_pushstring(L, "code");
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lua_pushinteger(L, (int) input.code);
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lua_settable(L, -3);
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lua_pushstring(L, "value");
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lua_pushinteger(L, (int) input.value);
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lua_settable(L, -3);
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lua_pushstring(L, "time");
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lua_newtable(L);
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lua_pushstring(L, "sec");
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lua_pushinteger(L, (int) input.time.tv_sec);
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lua_settable(L, -3);
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lua_pushstring(L, "usec");
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lua_pushinteger(L, (int) input.time.tv_usec);
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lua_settable(L, -3);
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lua_settable(L, -3);
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}
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static int waitForInput(lua_State *L) {
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struct input_event input;
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int n;
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int usecs = luaL_optint(L, 1, -1); // we check for <0 later
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#ifndef EMULATE_READER
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fd_set fds;
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struct timeval timeout;
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int i, num, nfds;
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timeout.tv_sec = (usecs/1000000);
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timeout.tv_usec = (usecs%1000000);
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nfds = 0;
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FD_ZERO(&fds);
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for(i=0; i<NUM_FDS; i++) {
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if(inputfds[i] != -1)
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FD_SET(inputfds[i], &fds);
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if(inputfds[i] + 1 > nfds)
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nfds = inputfds[i] + 1;
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}
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/* when no value is given as argument, we pass
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* NULL to select() for the timeout value, setting no
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* timeout at all.
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*/
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num = select(nfds, &fds, NULL, NULL, (usecs < 0) ? NULL : &timeout);
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if(num <= 0) {
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return luaL_error(L, "Waiting for input failed: %d\n", errno);
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}
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for(i=0; i<NUM_FDS; i++) {
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if(inputfds[i] != -1 && FD_ISSET(inputfds[i], &fds)) {
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n = read(inputfds[i], &input, sizeof(struct input_event));
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if(n == sizeof(struct input_event)) {
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set_event_table(L, input);
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return 1;
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}
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}
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}
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#else
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SDL_Event event;
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while(1) {
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/* so far we only use inputfds[0] in emu mode */
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n = read(inputfds[0], &input, sizeof(struct input_event));
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if(n == sizeof(struct input_event)) {
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set_event_table(L, input);
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return 1;
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}
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int ticks = SDL_GetTicks();
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if (usecs < 0) {
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SDL_WaitEvent(&event);
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}
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else {
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while (SDL_GetTicks()-ticks <= usecs/1000) {
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if (SDL_PollEvent(&event)) break;
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SDL_Delay(10);
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}
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if (SDL_GetTicks()-ticks > usecs/1000)
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return luaL_error(L, "Waiting for input failed: timeout\n");
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}
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switch(event.type) {
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case SDL_KEYDOWN:
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genEmuEvent(L, inputfds[0], EV_KEY, event.key.keysym.scancode, 1);
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break;
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case SDL_KEYUP:
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genEmuEvent(L, inputfds[0], EV_KEY, event.key.keysym.scancode, 0);
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break;
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case SDL_MOUSEMOTION:
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if (is_in_touch) {
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if (event.motion.xrel != 0)
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genEmuEvent(L, inputfds[0], EV_ABS, ABS_MT_POSITION_X, event.button.x);
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if (event.motion.yrel != 0)
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genEmuEvent(L, inputfds[0], EV_ABS, ABS_MT_POSITION_Y, event.button.y);
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genEmuEvent(L, inputfds[0], EV_SYN, SYN_REPORT, 0);
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}
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break;
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case SDL_MOUSEBUTTONUP:
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is_in_touch = 0;
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genEmuEvent(L, inputfds[0], EV_ABS, ABS_MT_TRACKING_ID, -1);
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genEmuEvent(L, inputfds[0], EV_SYN, SYN_REPORT, 0);
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break;
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case SDL_MOUSEBUTTONDOWN:
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/* use mouse click to simulate single tap */
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is_in_touch = 1;
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genEmuEvent(L, inputfds[0], EV_ABS, ABS_MT_TRACKING_ID, 0);
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genEmuEvent(L, inputfds[0], EV_ABS, ABS_MT_POSITION_X, event.button.x);
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genEmuEvent(L, inputfds[0], EV_ABS, ABS_MT_POSITION_Y, event.button.y);
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genEmuEvent(L, inputfds[0], EV_SYN, SYN_REPORT, 0);
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/*printf("Mouse button %d pressed at (%d,%d)\n",*/
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/*event.button.button, event.button.x, event.button.y);*/
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break;
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case SDL_QUIT:
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return luaL_error(L, "application forced to quit");
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}
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}
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#endif
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return 0;
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}
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static const struct luaL_Reg input_func[] = {
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{"open", openInputDevice},
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{"closeAll", closeInputDevices},
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{"waitForEvent", waitForInput},
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{NULL, NULL}
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};
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int luaopen_input(lua_State *L) {
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luaL_register(L, "input", input_func);
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return 1;
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}
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