mirror of
https://github.com/Rockbox/rockbox.git
synced 2026-01-22 01:30:35 -05:00
8d15aff38a
3a4da9381e change an underdocumented definition that turns
out to be important, yet not documented in the linux uapi definitions.
Revert that change, and document the magic values so this doesn't happen again.
Change-Id: I0fac4a9d68170920bb5db1018d765e8a2994a95f
305 lines
8.7 KiB
C
305 lines
8.7 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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#ifdef HAVE_SCROLLWHEEL
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#include "powermgmt.h"
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#if defined(HAVE_BACKLIGHT) || defined(HAVE_BUTTON_LIGHT)
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#include "backlight.h"
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#endif
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#endif /* HAVE_SCROLLWHEEL */
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/* TODO: HAVE_SCROLLWHEEL is a hack. Instead of posting the exact number
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of clicks, instead do it similar to the ipod clickwheel and post
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the wheel angular velocity (degrees per second)
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* Track the relative position (ie based on click events)
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* Use WHEELCLICKS_PER_ROTATION to convert clicks to angular distance
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* Compute to angular velocity (degrees per second)
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*/
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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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#ifdef BUTTON_DELAY_RELEASE
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static int button_delay_release = 0;
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static int delay_tick = 0;
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#endif
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#ifdef HAVE_TOUCHSCREEN
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/* Last known touchscreen coordinates. */
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static int _last_x = 0;
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static int _last_y = 0;
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/* Last known touchscreen state. */
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static enum
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{
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TOUCHSCREEN_STATE_UNKNOWN = 0,
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TOUCHSCREEN_STATE_UP,
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TOUCHSCREEN_STATE_DOWN
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} _last_touch_state = TOUCHSCREEN_STATE_UNKNOWN;
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/* Do _NOT_ change this. Unofficial Linux API */
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#define EVENT_VALUE_TOUCHSCREEN_RELEASE -1
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/* This is only used as an arbitrary placeholder */
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#define EVENT_VALUE_TOUCHSCREEN_PRESS 1
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static int ts_enabled = 1;
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void touchscreen_last_state(int *x, int *y, int *state)
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{
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*x = _last_x;
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*y = _last_y;
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*state = _last_touch_state;
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}
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void touchscreen_enable_device(bool en)
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{
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ts_enabled = en;
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}
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static void handle_touchscreen_event(__u16 code, __s32 value)
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{
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switch(code)
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{
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case ABS_X:
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case ABS_MT_POSITION_X:
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{
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_last_x = value;
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break;
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}
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case ABS_Y:
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case ABS_MT_POSITION_Y:
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{
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_last_y = value;
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break;
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}
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case ABS_MT_TRACKING_ID:
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{
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if(value == EVENT_VALUE_TOUCHSCREEN_RELEASE)
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{
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_last_touch_state = TOUCHSCREEN_STATE_UP;
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}
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else
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{
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_last_touch_state = TOUCHSCREEN_STATE_DOWN;
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}
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break;
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}
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}
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}
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#endif
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#ifdef HAVE_BUTTON_DATA
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#define BDATA int *data
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#else
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#define BDATA void
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#endif
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int button_read_device(BDATA)
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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(HAVE_BUTTON_DATA) && !defined(HAVE_TOUCHSCREEN)
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(void)data;
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#endif
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#ifdef HAVE_SCROLLWHEEL
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int wheel_ticks = 0;
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#endif
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#ifdef BUTTON_DELAY_RELEASE
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/* First de-assert delayed-release buttons */
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if (button_delay_release && current_tick >= delay_tick)
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{
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button_bitmap &= ~button_delay_release;
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button_delay_release = 0;
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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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for(int i = 0; i < num_devices; i++) {
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/* read only if non-blocking */
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if(poll_fds[i].revents & POLLIN) {
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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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switch(event.type) {
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case EV_KEY: {
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/* map linux event code to rockbox button bitmap */
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int bmap = button_map(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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if(event.value) {
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#ifdef HAVE_SCROLLWHEEL
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/* Filter out wheel ticks */
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if (bmap & BUTTON_SCROLL_BACK)
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wheel_ticks--;
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else if (bmap & BUTTON_SCROLL_FWD)
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wheel_ticks++;
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bmap &= ~(BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD);
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#endif
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#ifdef BUTTON_DELAY_RELEASE
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bmap &= ~BUTTON_DELAY_RELEASE;
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#endif
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#if defined(HAVE_TOUCHSCREEN) && defined(BUTTON_TOUCH)
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/* Some touchscreens give us actual touch/untouch as a "key" */
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if (bmap & BUTTON_TOUCH) {
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handle_touchscreen_event(ABS_MT_TRACKING_ID, EVENT_VALUE_TOUCHSCREEN_PRESS);
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bmap &= ~BUTTON_TOUCH;
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}
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#endif
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button_bitmap |= bmap;
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} else {
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#if defined(HAVE_TOUCHSCREEN) && defined(BUTTON_TOUCH)
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/* Some touchscreens give us actual touch/untouch as a "key" */
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if (bmap & BUTTON_TOUCH) {
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handle_touchscreen_event(ABS_MT_TRACKING_ID, EVENT_VALUE_TOUCHSCREEN_RELEASE);
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bmap &= ~BUTTON_TOUCH;
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}
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#endif
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#ifdef BUTTON_DELAY_RELEASE
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/* Delay the release of any requested buttons */
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if (bmap & BUTTON_DELAY_RELEASE) {
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button_delay_release |= bmap & ~BUTTON_DELAY_RELEASE;
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delay_tick = current_tick + HZ/20;
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bmap = 0;
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}
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#endif
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#ifdef HAVE_SCROLLWHEEL
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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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break;
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}
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#ifdef HAVE_TOUCHSCREEN
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case EV_ABS: {
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if (ts_enabled) {
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handle_touchscreen_event(event.code, event.value);
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} else {
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/* If disabled... ignore */
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_last_touch_state = TOUCHSCREEN_STATE_UNKNOWN;
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}
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break;
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}
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#endif
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default:
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/* Ignore other event types */
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break;
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}
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}
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}
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}
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}
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#ifdef HAVE_SCROLLWHEEL
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/* Reset backlight and poweroff timers */
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if (wheel_ticks) {
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#ifdef HAVE_BACKLIGHT
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backlight_on();
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#endif
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#ifdef HAVE_BUTTON_LIGHT
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buttonlight_on();
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#endif
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reset_poweroff_timer();
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}
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if (wheel_ticks > 0)
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{
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while (wheel_ticks-- > 0)
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{
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button_queue_post(BUTTON_SCROLL_FWD, 0);
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}
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}
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else if (wheel_ticks < 0)
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{
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while (wheel_ticks++ < 0)
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{
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button_queue_post(BUTTON_SCROLL_BACK, 0);
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}
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}
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#endif /* HAVE_SCROLLWHEEL */
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#ifdef HAVE_TOUCHSCREEN
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int touch = touchscreen_to_pixels(_last_x, _last_y, data);
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if(_last_touch_state == TOUCHSCREEN_STATE_DOWN)
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{
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return button_bitmap | touch;
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}
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#endif
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return button_bitmap;
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}
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