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/* sqUnixFBDevMousePS2.c -- weirdness unique to PS/2 mice
*
* Author: Ian.Piumarta@INRIA.Fr
*
* Last edited: 2009-08-19 04:35:03 by piumarta on emilia-2.local
*/
/* The framebuffer display driver was donated to the Squeak community by:
*
* Weather Dimensions, Inc.
* 13271 Skislope Way, Truckee, CA 96161
* http://www.weatherdimensions.com
*
* Copyright (C) 2003 Ian Piumarta
* All Rights Reserved.
*
* This file is part of Unix Squeak.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define PS2_DISABLE_DELAY 100*1000
#define PS2_RESET_DELAY 1500*1000
#define PS2_FLUSH_DELAY 100*1000
#define PS2_READ_DELAY 100*1000
#define PS2_SEND_DELAY 100*1000
#define PS2_RESET 0xff
#define PS2_RESEND 0xfe
#define PS2_ERROR 0xfc
#define PS2_OK 0xfa
#define PS2_SET_DEFAULTS 0xf6
#define PS2_DISABLE 0xf5
#define PS2_ENABLE 0xf4
#define PS2_SET_SAMPLE_RATE 0xf3
#define PS2_GET_ID 0xf2
#define PS2_SET_REMOTE_MODE 0xf0
#define PS2_SET_WRAP_MODE 0xee
#define PS2_RESET_WRAP_MODE 0xec
#define PS2_READ_DATA 0xeb
#define PS2_SET_STREAM_MODE 0xea
#define PS2_STATUS_REQUEST 0xe9
#define PS2_SELFTEST_OK 0xaa
static void ms_ps2_flush(_self)
{
unsigned char buf[32];
debugf("%s: flush\n", self->msName);
while (ms_read(self, buf, sizeof(buf), 1, PS2_FLUSH_DELAY))
;
}
static void ms_ps2_handleEvents(_self)
{
unsigned char buf[3*8];
int n;
if ((n= ms_read(self, buf, sizeof(buf), 3, PS2_READ_DELAY)) >= 3)
{
unsigned char *cmd= buf;
while (n >= 3)
{
int b= 0, dx, dy;
// The protocol requires the top 2 bits clear and bit 3 set.
// Some Micro$oft mice violate this, but any luser stupid
// enough to buy a M$ mouse deserves what they get.
if (0x08 != (cmd[0] & 0xc8))
{
fprintf(stderr, "%s: illegal command: %02x %02x %02x\n", self->msName,
cmd[0], cmd[1], cmd[2]);
ms_ps2_flush(self); // resync the stream
return;
}
if (cmd[0] & 1) b |= RedButtonBit;
if (cmd[0] & 2) b |= BlueButtonBit;
if (cmd[0] & 4) b |= YellowButtonBit;
dx= cmd[1]; if (cmd[0] & 0x10) dx -= 256;
dy= cmd[2]; if (cmd[0] & 0x20) dy -= 256;
dy= -dy;
self->callback(b, dx, dy);
n -= 3; cmd += 3;
}
}
}
static int ms_ps2_send(_self, unsigned char *command, int len)
{
unsigned char buf[1];
int i;
debugf("%s: send\n", self->msName);
for (i= 0; i < len; ++i)
{
resend:
if (1 != write(self->fd, command + i, 1))
{
debugf("%s: send failed during write\n", self->msName);
return 0;
}
debugf(">%02x\n", command[i]);
if (1 != ms_read(self, buf, 1, 1, PS2_SEND_DELAY))
{
debugf("%s: send failed during read\n", self->msName);
return 0;
}
switch (buf[0])
{
case PS2_OK:
case PS2_SELFTEST_OK: /* /dev/input/mice emulation is broken */
break;
case PS2_ERROR:
fprintf(stderr, "%s: error response in send\n", self->msName);
return 0;
case PS2_RESEND:
debugf("%s: resend\n", self->msName);
goto resend;
default:
fprintf(stderr, "%s: illegal response %02x in send\n", self->msName, buf[0]);
break;
}
}
return 1;
}
static void ms_ps2_disable(_self)
{
unsigned char command[]= { PS2_DISABLE };
debugf("%s: disable\n", self->msName);
if (1 != write(self->fd, command, 1))
{
debugf("%s: disable failed during write\n", self->msName);
return;
}
debugf(">%02x\n", command[0]);
while (1 == ms_read(self, command, 1, 1, PS2_DISABLE_DELAY))
if (PS2_OK == command[0])
break;
}
static int ms_ps2_enable(_self)
{
unsigned char command[]= { PS2_ENABLE };
debugf("%s: enable\n", self->msName);
return ms_ps2_send(self, command, sizeof(command));
}
static int ms_ps2_reset(_self)
{
unsigned char command[]= { PS2_RESET }, buf[2];
debugf("%s: reset\n", self->msName);
if (!ms_ps2_send(self, command, sizeof(command)))
return -1;
if (2 == ms_read(self, buf, 2, 2, PS2_RESET_DELAY))
{
debugf("%s: response %02x %02x\n", self->msName, buf[0], buf[1]);
switch (buf[0])
{
case PS2_SELFTEST_OK:
return buf[1]; // mouse device id
break;
case PS2_ERROR:
fprintf(stderr, "%s: self-test failed\n", self->msName);
break;
default:
debugf("%s: bad response\n", self->msName);
break;
}
}
/* /dev/input/mice emulation returns PS2_SELFTEST_OK where send()
expects PS2_OK, causing control to fall through to here. we pick
up the mouse id immediately in the flush(), so the only harm done
is a misleading "reset failed" message while debugging. */
ms_ps2_flush(self);
debugf("%s: reset failed\n", self->msName);
return -1;
}
static void ms_ps2_init(_self)
{
int id;
ms_ps2_disable(self);
id= ms_ps2_reset(self);
debugf("%s: mouse id %02x\n", self->msName, id);
ms_ps2_enable(self);
}
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