Add initial evdev framework
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Keith Packard
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/*
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* $Id$
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*
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* Copyright © 2004 Keith Packard
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Keith Packard not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Keith Packard makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#define NEED_EVENTS
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#include <errno.h>
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#include <linux/input.h>
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#include <X11/X.h>
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#include <X11/Xproto.h>
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#include <X11/Xpoll.h>
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#include "inputstr.h"
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#include "scrnintstr.h"
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#include "kdrive.h"
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#define NUM_EVENTS 128
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#define ABS_UNSET -65535
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#define BITS_PER_LONG (sizeof(long) * 8)
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#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
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#define ISBITSET(x,y) ((x)[LONG(y)] & BIT(y))
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#define OFF(x) ((x)%BITS_PER_LONG)
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#define LONG(x) ((x)/BITS_PER_LONG)
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#define BIT(x) (1 << OFF(x))
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#define SETBIT(x,y) ((x)[LONG(y)] |= BIT(y))
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#define CLRBIT(x,y) ((x)[LONG(y)] &= ~BIT(y))
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#define ASSIGNBIT(x,y,z) ((x)[LONG(y)] = ((x)[LONG(y)] & ~BIT(y)) | (z << OFF(y)))
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typedef struct _kevdevMouse {
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/* current device state */
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int rel[REL_MAX + 1];
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int abs[ABS_MAX + 1];
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int prevabs[ABS_MAX + 1];
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long key[NBITS(KEY_MAX + 1)];
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/* supported device info */
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long relbits[NBITS(REL_MAX + 1)];
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long absbits[NBITS(ABS_MAX + 1)];
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long keybits[NBITS(KEY_MAX + 1)];
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struct input_absinfo absinfo[ABS_MAX + 1];
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int max_rel;
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int max_abs;
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} Kevdev;
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static void
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EvdevMotion (KdMouseInfo *mi)
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{
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Kevdev *ke = mi->driver;
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int i;
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for (i = 0; i <= ke->max_rel; i++)
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if (ke->rel[i])
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{
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int a;
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ErrorF ("rel");
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for (a = 0; a <= ke->max_rel; a++)
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{
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if (ISBITSET (ke->relbits, a))
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ErrorF (" %d=%d", a, ke->rel[a]);
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ke->rel[a] = 0;
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}
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ErrorF ("\n");
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break;
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}
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for (i = 0; i < ke->max_abs; i++)
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if (ke->abs[i] != ke->prevabs[i])
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{
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int a;
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ErrorF ("abs");
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for (a = 0; a <= ke->max_abs; a++)
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{
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if (ISBITSET (ke->absbits, a))
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ErrorF (" %d=%d", a, ke->abs[a]);
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ke->prevabs[a] = ke->abs[a];
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}
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ErrorF ("\n");
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break;
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}
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}
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static void
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EvdevRead (int evdevPort, void *closure)
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{
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KdMouseInfo *mi = closure;
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Kevdev *ke = mi->driver;
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int i;
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struct input_event events[NUM_EVENTS];
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int n;
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n = read (evdevPort, &events, NUM_EVENTS * sizeof (struct input_event));
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if (n <= 0)
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return;
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n /= sizeof (struct input_event);
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for (i = 0; i < n; i++)
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{
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switch (events[i].type) {
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case EV_SYN:
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break;
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case EV_KEY:
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EvdevMotion (mi);
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ASSIGNBIT(ke->key,events[i].code, events[i].value);
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if (events[i].code < 0x100)
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ErrorF ("key %d %d\n", events[i].code, events[i].value);
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else
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ErrorF ("key 0x%x %d\n", events[i].code, events[i].value);
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break;
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case EV_REL:
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ke->rel[events[i].code] += events[i].value;
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break;
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case EV_ABS:
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ke->abs[events[i].code] = events[i].value;
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break;
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}
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}
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EvdevMotion (mi);
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}
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int EvdevInputType;
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char *kdefaultEvdev[] = {
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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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#define NUM_DEFAULT_EVDEV (sizeof (kdefaultEvdev) / sizeof (kdefaultEvdev[0]))
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static Bool
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EvdevInit (void)
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{
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int i;
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int fd;
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KdMouseInfo *mi, *next;
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int n = 0;
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char *prot;
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if (!EvdevInputType)
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EvdevInputType = KdAllocInputType ();
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for (mi = kdMouseInfo; mi; mi = next)
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{
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next = mi->next;
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prot = mi->prot;
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if (mi->inputType)
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continue;
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if (!mi->name)
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{
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for (i = 0; i < NUM_DEFAULT_EVDEV; i++)
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{
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fd = open (kdefaultEvdev[i], 2);
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if (fd >= 0)
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{
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mi->name = KdSaveString (kdefaultEvdev[i]);
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break;
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}
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}
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}
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else
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fd = open (mi->name, 2);
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if (fd >= 0)
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{
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unsigned long ev[NBITS(EV_MAX)];
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Kevdev *ke;
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if (ioctl (fd, EVIOCGBIT(0 /*EV*/, sizeof (ev)), ev) < 0)
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{
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perror ("EVIOCGBIT 0");
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close (fd);
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continue;
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}
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ke = xalloc (sizeof (Kevdev));
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if (!ke)
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{
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close (fd);
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continue;
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}
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memset (ke, '\0', sizeof (Kevdev));
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if (ISBITSET (ev, EV_KEY))
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{
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if (ioctl (fd, EVIOCGBIT (EV_KEY, sizeof (ke->keybits)),
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ke->keybits) < 0)
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{
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perror ("EVIOCGBIT EV_KEY");
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xfree (ke);
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close (fd);
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continue;
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}
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}
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if (ISBITSET (ev, EV_REL))
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{
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if (ioctl (fd, EVIOCGBIT (EV_REL, sizeof (ke->relbits)),
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ke->relbits) < 0)
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{
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perror ("EVIOCGBIT EV_REL");
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xfree (ke);
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close (fd);
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continue;
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}
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for (ke->max_rel = REL_MAX; ke->max_rel >= 0; ke->max_rel--)
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if (ISBITSET(ke->relbits, ke->max_rel))
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break;
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}
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if (ISBITSET (ev, EV_ABS))
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{
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int i;
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if (ioctl (fd, EVIOCGBIT (EV_ABS, sizeof (ke->absbits)),
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ke->absbits) < 0)
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{
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perror ("EVIOCGBIT EV_ABS");
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xfree (ke);
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close (fd);
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continue;
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}
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for (ke->max_abs = ABS_MAX; ke->max_abs >= 0; ke->max_abs--)
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if (ISBITSET(ke->absbits, ke->max_abs))
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break;
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for (i = 0; i <= ke->max_abs; i++)
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{
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if (ISBITSET (ke->absbits, i))
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if (ioctl (fd, EVIOCGABS(i), &ke->absinfo[i]) < 0)
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{
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perror ("EVIOCGABS");
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break;
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}
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ke->prevabs[i] = ABS_UNSET;
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}
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if (i <= ke->max_abs)
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{
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xfree (ke);
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close (fd);
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continue;
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}
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}
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mi->driver = ke;
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mi->inputType = EvdevInputType;
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if (KdRegisterFd (EvdevInputType, fd, EvdevRead, (void *) mi))
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n++;
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}
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}
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return TRUE;
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}
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static void
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EvdevFini (void)
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{
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KdMouseInfo *mi;
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KdUnregisterFds (EvdevInputType, TRUE);
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for (mi = kdMouseInfo; mi; mi = mi->next)
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{
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if (mi->inputType == EvdevInputType)
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{
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xfree (mi->driver);
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mi->driver = 0;
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mi->inputType = 0;
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}
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}
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}
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KdMouseFuncs LinuxEvdevMouseFuncs = {
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EvdevInit,
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EvdevFini,
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};
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#if 0
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KdKeyboardFuncs LinuxEvdevKeyboardFuncs = {
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EvdevKbdLoad,
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EvdevKbdInit,
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EvdevKbdLeds,
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EvdevKbdBell,
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EvdevKbdFini,
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0,
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};
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#endif
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