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158 lines
5.1 KiB
C
158 lines
5.1 KiB
C
/* $Id: ms-mssystems.c,v 1.3 2010/02/14 00:42:25 fredette Exp $ */
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/* serial/ms-mssystems.c - MouseSystems serial mouse emulation: */
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/*
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* Copyright (c) 2003 Matt Fredette
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Matt Fredette.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <tme/common.h>
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_TME_RCSID("$Id: ms-mssystems.c,v 1.3 2010/02/14 00:42:25 fredette Exp $");
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/* includes: */
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#include "serial-ms.h"
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/* macros: */
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/* the buttons: */
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#define TME_MS_MSSYSTEMS5_BUTTON_2 TME_BIT(0)
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#define TME_MS_MSSYSTEMS5_BUTTON_1 TME_BIT(1)
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#define TME_MS_MSSYSTEMS5_BUTTON_0 TME_BIT(2)
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/* types: */
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/* this subroutine sets the axis delta field in a packet, given an
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original axis delta and the offset of the first byte in the packet
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for the field.
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this is necessary because the first byte of a packet is the only
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one allowed to have a value in the range 0x80..0x8f: */
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static inline void
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_tme_ms_mssystems5_delta(int delta, tme_uint8_t *d0)
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{
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if (delta > 0x7f) {
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d0[0] = 0x7f;
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delta -= 0x7f;
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d0[2] = TME_MIN(delta, 0x7f);
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}
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else if (delta <= (char) 0x8f) {
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d0[0] = 0x90;
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delta -= (char) 0x90;
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d0[2] = TME_MAX(delta, (char) 0x90);
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}
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else {
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d0[0] = delta;
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d0[2] = 0;
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}
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}
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/* this is called to make serial data from mouse events: */
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static int
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_tme_ms_mssystems5_events(struct tme_serial_ms *serial_ms,
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const struct tme_mouse_event *event,
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unsigned int count)
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{
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tme_uint8_t packet[5], byte0;
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unsigned int buttons;
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for (; count-- > 0; event++) {
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/* start the first byte of the packet. this byte has
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button and packet length information: */
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byte0 = 0x80;
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/* add in the buttons. a set bit means a button is released: */
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byte0 |= (TME_MS_MSSYSTEMS5_BUTTON_0
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| TME_MS_MSSYSTEMS5_BUTTON_1
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| TME_MS_MSSYSTEMS5_BUTTON_2);
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buttons = event->tme_mouse_event_buttons;
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if (buttons & TME_MOUSE_BUTTON_0) {
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byte0 ^= TME_MS_MSSYSTEMS5_BUTTON_0;
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}
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if (buttons & TME_MOUSE_BUTTON_1) {
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byte0 ^= TME_MS_MSSYSTEMS5_BUTTON_1;
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}
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if (buttons & TME_MOUSE_BUTTON_2) {
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byte0 ^= TME_MS_MSSYSTEMS5_BUTTON_2;
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}
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/* put in the deltas. in the MouseSystems protocol, a negative
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y delta corresponds to "down" mouse movement: */
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_tme_ms_mssystems5_delta(event->tme_mouse_event_delta_x,
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&packet[1]);
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_tme_ms_mssystems5_delta(-event->tme_mouse_event_delta_y,
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&packet[2]);
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/* put in the first byte: */
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packet[0] = byte0;
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/* copy the packet into the serial buffer: */
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tme_serial_buffer_copyin(&serial_ms->tme_serial_ms_serial_buffer,
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packet,
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sizeof(packet),
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TME_SERIAL_DATA_NORMAL,
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TME_SERIAL_COPY_FULL_IS_OVERRUN);
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}
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return (TME_OK);
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}
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/* this initializes MouseSystems serial mouse emulation: */
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int
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_tme_serial_ms_mssystems5_init(struct tme_serial_ms *serial_ms)
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{
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struct tme_serial_config *config;
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/* set our type-dependent functions: */
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serial_ms->tme_serial_ms_type_events = _tme_ms_mssystems5_events;
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serial_ms->tme_serial_ms_type_serial_ctrl = NULL;
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serial_ms->tme_serial_ms_type_serial_input = NULL;
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/* set our serial configuration: */
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config = &serial_ms->tme_serial_ms_type_config;
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memset(config, 0, sizeof(*config));
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config->tme_serial_config_baud = 1200;
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config->tme_serial_config_bits_data = 8;
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config->tme_serial_config_bits_stop = 1;
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config->tme_serial_config_parity = TME_SERIAL_PARITY_NONE;
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/* set our rate-limiting: */
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serial_ms->tme_serial_ms_rate_usec
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= TME_MAX(serial_ms->tme_serial_ms_rate_usec,
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(1000000
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/ (config->tme_serial_config_baud
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/ 5 /* size of one packet */)));
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return (TME_OK);
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}
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