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/***************************************************************************
* __________ __ ___
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2017 Marcin Bukat
* Copyright (C) 2020 Solomon Peachy
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <poll.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <linux/input.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include "kernel.h"
#include "sysfs.h"
#include "button.h"
#include "panic.h"
#ifdef HAVE_SCROLLWHEEL
#include "powermgmt.h"
#if defined(HAVE_BACKLIGHT) || defined(HAVE_BUTTON_LIGHT)
#include "backlight.h"
#endif
#endif /* HAVE_SCROLLWHEEL */
/* TODO: HAVE_SCROLLWHEEL is a hack. Instead of posting the exact number
of clicks, instead do it similar to the ipod clickwheel and post
the wheel angular velocity (degrees per second)
* Track the relative position (ie based on click events)
* Use WHEELCLICKS_PER_ROTATION to convert clicks to angular distance
* Compute to angular velocity (degrees per second)
*/
#define NR_POLL_DESC 4
static int num_devices = 0;
static struct pollfd poll_fds[NR_POLL_DESC];
void button_init_device(void)
{
const char * const input_devs[NR_POLL_DESC] = {
"/dev/input/event0",
"/dev/input/event1",
"/dev/input/event2",
"/dev/input/event3",
};
for(int i = 0; i < NR_POLL_DESC; i++)
{
int fd = open(input_devs[i], O_RDONLY | O_CLOEXEC);
if(fd >= 0)
{
poll_fds[num_devices].fd = fd;
poll_fds[num_devices].events = POLLIN;
poll_fds[num_devices].revents = 0;
num_devices++;
}
}
}
void button_close_device(void)
{
/* close descriptors */
for(int i = 0; i < num_devices; i++)
{
close(poll_fds[i].fd);
}
num_devices = 0;
}
#ifdef BUTTON_DELAY_RELEASE
static int button_delay_release = 0;
static int delay_tick = 0;
#endif
#ifdef HAVE_TOUCHSCREEN
/* Last known touchscreen coordinates. */
static int _last_x = 0;
static int _last_y = 0;
/* Last known touchscreen state. */
static enum
{
TOUCHSCREEN_STATE_UNKNOWN = 0,
TOUCHSCREEN_STATE_UP,
TOUCHSCREEN_STATE_DOWN
} _last_touch_state = TOUCHSCREEN_STATE_UNKNOWN;
// XXX ... figure out what is standard.
#define EVENT_VALUE_TOUCHSCREEN_PRESS 1
#define EVENT_VALUE_TOUCHSCREEN_RELEASE -1
static int ts_enabled = 0;
void touchscreen_enable_device(bool en)
{
ts_enabled = en;
}
static bool handle_touchscreen_event(__u16 code, __s32 value)
{
bool read_more = false;
switch(code)
{
case ABS_X:
case ABS_MT_POSITION_X:
{
_last_x = value;
/* x -> next will be y. */
read_more = true;
break;
}
case ABS_Y:
case ABS_MT_POSITION_Y:
{
_last_y = value;
break;
}
case ABS_MT_TRACKING_ID:
{
if(value == EVENT_VALUE_TOUCHSCREEN_PRESS)
{
_last_touch_state = TOUCHSCREEN_STATE_DOWN;
/* Press -> next will be x. */
read_more = true;
}
else
{
_last_touch_state = TOUCHSCREEN_STATE_UP;
}
break;
}
}
return read_more;
}
#endif
#ifdef HAVE_BUTTON_DATA
#define BDATA int *data
#else
#define BDATA void
#endif
int button_read_device(BDATA)
{
static int button_bitmap = 0;
struct input_event event;
#if defined(HAVE_BUTTON_DATA) && !defined(HAVE_TOUCHSCREEN)
(void)data;
#endif
#ifdef HAVE_SCROLLWHEEL
int wheel_ticks = 0;
#endif
#ifdef BUTTON_DELAY_RELEASE
/* First de-assert delayed-release buttons */
if (button_delay_release && current_tick >= delay_tick)
{
button_bitmap &= ~button_delay_release;
button_delay_release = 0;
}
#endif
/* check if there are any events pending and process them */
while(poll(poll_fds, num_devices, 0)) {
for(int i = 0; i < num_devices; i++) {
/* read only if non-blocking */
if(poll_fds[i].revents & POLLIN) {
int size = read(poll_fds[i].fd, &event, sizeof(event));
if(size == (int)sizeof(event)) {
switch(event.type) {
case EV_KEY: {
/* map linux event code to rockbox button bitmap */
int bmap = button_map(event.code);
/* event.value == 0x10000 means press
* event.value == 0 means release
*/
if(event.value) {
#ifdef HAVE_SCROLLWHEEL
/* Filter out wheel ticks */
if (bmap & BUTTON_SCROLL_BACK)
wheel_ticks--;
else if (bmap & BUTTON_SCROLL_FWD)
wheel_ticks++;
bmap &= ~(BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD);
#endif
#ifdef BUTTON_DELAY_RELEASE
bmap &= ~BUTTON_DELAY_RELEASE;
#endif
#if defined(HAVE_TOUCHSCREEN) && defined(BUTTON_TOUCH)
/* Some touchscreens give us actual touch/untouch as a "key" */
if (bmap & BUTTON_TOUCH) {
handle_touchscreen_event(ABS_MT_TRACKING_ID, EVENT_VALUE_TOUCHSCREEN_PRESS);
bmap &= ~BUTTON_TOUCH;
}
#endif
button_bitmap |= bmap;
} else {
#if defined(HAVE_TOUCHSCREEN) && defined(BUTTON_TOUCH)
/* Some touchscreens give us actual touch/untouch as a "key" */
if (bmap & BUTTON_TOUCH) {
handle_touchscreen_event(ABS_MT_TRACKING_ID, 0);
bmap &= ~BUTTON_TOUCH;
}
#endif
#ifdef BUTTON_DELAY_RELEASE
/* Delay the release of any requested buttons */
if (bmap & BUTTON_DELAY_RELEASE) {
button_delay_release |= bmap & ~BUTTON_DELAY_RELEASE;
delay_tick = current_tick + HZ/20;
bmap = 0;
}
#endif
#ifdef HAVE_SCROLLWHEEL
/* Wheel gives us press+release back to back; ignore the release */
bmap &= ~(BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD);
#endif
button_bitmap &= ~bmap;
}
break;
}
#ifdef HAVE_TOUCHSCREEN
case EV_ABS: {
if (ts_enabled) {
handle_touchscreen_event(event.code, event.value);
} else {
/* If disabled... ignore */
_last_touch_state = TOUCHSCREEN_STATE_UNKNOWN;
}
break;
}
#endif
default:
/* Ignore other event types */
break;
}
}
}
}
}
#ifdef HAVE_SCROLLWHEEL
/* Reset backlight and poweroff timers */
if (wheel_ticks) {
#ifdef HAVE_BACKLIGHT
backlight_on();
#endif
#ifdef HAVE_BUTTON_LIGHT
buttonlight_on();
#endif
reset_poweroff_timer();
}
if (wheel_ticks > 0)
{
while (wheel_ticks-- > 0)
{
button_queue_post(BUTTON_SCROLL_FWD, 0);
}
}
else if (wheel_ticks < 0)
{
while (wheel_ticks++ < 0)
{
button_queue_post(BUTTON_SCROLL_BACK, 0);
}
}
#endif /* HAVE_SCROLLWHEEL */
#ifdef HAVE_TOUCHSCREEN
int touch = touchscreen_to_pixels(_last_x, _last_y, data);
if(_last_touch_state == TOUCHSCREEN_STATE_DOWN)
{
return button_bitmap | touch;
}
#endif
return button_bitmap;
}
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