136 lines
4 KiB
C
136 lines
4 KiB
C
/***************************************************************************
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* __________ __ ___
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2017 Marcin Bukat
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* Copyright (C) 2020 Solomon Peachy
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <poll.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <linux/input.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdlib.h>
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#include "kernel.h"
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#include "sysfs.h"
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#include "button.h"
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#include "panic.h"
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#define NR_POLL_DESC 4
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static int num_devices = 0;
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static struct pollfd poll_fds[NR_POLL_DESC];
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void button_init_device(void)
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{
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const char * const input_devs[NR_POLL_DESC] = {
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"/dev/input/event0",
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"/dev/input/event1",
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"/dev/input/event2",
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"/dev/input/event3",
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};
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for(int i = 0; i < NR_POLL_DESC; i++)
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{
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int fd = open(input_devs[i], O_RDONLY | O_CLOEXEC);
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if(fd >= 0)
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{
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poll_fds[num_devices].fd = fd;
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poll_fds[num_devices].events = POLLIN;
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poll_fds[num_devices].revents = 0;
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num_devices++;
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}
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}
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}
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void button_close_device(void)
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{
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/* close descriptors */
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for(int i = 0; i < num_devices; i++)
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{
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close(poll_fds[i].fd);
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}
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num_devices = 0;
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}
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int button_read_device(void)
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{
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static int button_bitmap = 0;
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struct input_event event;
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#if defined(BUTTON_SCROLL_BACK)
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// FIXME TODO: Make this work via HAVE_SCROLL_WHEEL instead
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/* Wheel gives us press+release back to back, clear them after time elapses */
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static long last_tick = 0;
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if (button_bitmap & (BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD) &&
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current_tick - last_tick >= 2)
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{
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button_bitmap &= ~(BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD);
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}
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#endif
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/* check if there are any events pending and process them */
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while(poll(poll_fds, num_devices, 0))
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{
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for(int i = 0; i < num_devices; i++)
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{
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/* read only if non-blocking */
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if(poll_fds[i].revents & POLLIN)
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{
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int size = read(poll_fds[i].fd, &event, sizeof(event));
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if(size == (int)sizeof(event))
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{
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int keycode = event.code;
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/* event.value == 0x10000 means press
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* event.value == 0 means release
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*/
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bool press = event.value ? true : false;
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/* map linux event code to rockbox button bitmap */
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if(press)
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{
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int bmap = button_map(keycode);
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#if defined(BUTTON_SCROLL_BACK)
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/* Keep track of when the last wheel tick happened */
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if (bmap & (BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD))
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last_tick = current_tick;
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#endif
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button_bitmap |= bmap;
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}
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else
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{
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int bmap = button_map(keycode);
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#if defined(BUTTON_SCROLL_BACK)
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/* Wheel gives us press+release back to back; ignore the release */
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bmap &= ~(BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD);
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#endif
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button_bitmap &= ~bmap;
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}
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}
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}
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}
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}
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return button_bitmap;
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}
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