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Annotation of tme/serial/ms-mssystems.c, revision 1.1.1.2

1.1.1.2 ! root        1: /* $Id: ms-mssystems.c,v 1.3 2010/02/14 00:42:25 fredette Exp $ */
1.1       root        2: 
                      3: /* serial/ms-mssystems.c - MouseSystems serial mouse emulation: */
                      4: 
                      5: /*
                      6:  * Copyright (c) 2003 Matt Fredette
                      7:  * All rights reserved.
                      8:  *
                      9:  * Redistribution and use in source and binary forms, with or without
                     10:  * modification, are permitted provided that the following conditions
                     11:  * are met:
                     12:  * 1. Redistributions of source code must retain the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer.
                     14:  * 2. Redistributions in binary form must reproduce the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer in the
                     16:  *    documentation and/or other materials provided with the distribution.
                     17:  * 3. All advertising materials mentioning features or use of this software
                     18:  *    must display the following acknowledgement:
                     19:  *      This product includes software developed by Matt Fredette.
                     20:  * 4. The name of the author may not be used to endorse or promote products
                     21:  *    derived from this software without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
                     25:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
                     26:  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
                     27:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
                     28:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
                     29:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
                     31:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
                     32:  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     33:  * POSSIBILITY OF SUCH DAMAGE.
                     34:  */
                     35: 
                     36: #include <tme/common.h>
1.1.1.2 ! root       37: _TME_RCSID("$Id: ms-mssystems.c,v 1.3 2010/02/14 00:42:25 fredette Exp $");
1.1       root       38: 
                     39: /* includes: */
                     40: #include "serial-ms.h"
                     41: 
                     42: /* macros: */
                     43: 
                     44: /* the buttons: */
                     45: #define TME_MS_MSSYSTEMS5_BUTTON_2     TME_BIT(0)
                     46: #define TME_MS_MSSYSTEMS5_BUTTON_1     TME_BIT(1)
                     47: #define TME_MS_MSSYSTEMS5_BUTTON_0     TME_BIT(2)
                     48: 
                     49: /* types: */
                     50: 
                     51: /* this subroutine sets the axis delta field in a packet, given an
                     52:    original axis delta and the offset of the first byte in the packet
                     53:    for the field.
                     54: 
                     55:    this is necessary because the first byte of a packet is the only
                     56:    one allowed to have a value in the range 0x80..0x8f: */
                     57: static inline void
                     58: _tme_ms_mssystems5_delta(int delta, tme_uint8_t *d0)
                     59: {
                     60: 
                     61:   if (delta > 0x7f) {
                     62:     d0[0] = 0x7f;
                     63:     delta -= 0x7f;
                     64:     d0[2] = TME_MIN(delta, 0x7f);
                     65:   }
                     66: 
                     67:   else if (delta <= (char) 0x8f) {
                     68:     d0[0] = 0x90;
                     69:     delta -= (char) 0x90;
                     70:     d0[2] = TME_MAX(delta, (char) 0x90);
                     71:   }
                     72: 
                     73:   else {
                     74:     d0[0] = delta;
                     75:     d0[2] = 0;
                     76:   }
                     77: }
                     78: 
                     79: /* this is called to make serial data from mouse events: */
                     80: static int
                     81: _tme_ms_mssystems5_events(struct tme_serial_ms *serial_ms,
                     82:                          const struct tme_mouse_event *event,
                     83:                          unsigned int count)
                     84: {
                     85:   tme_uint8_t packet[5], byte0;
                     86:   unsigned int buttons;
                     87: 
                     88:   for (; count-- > 0; event++) {
                     89: 
                     90:     /* start the first byte of the packet.  this byte has
                     91:        button and packet length information: */
                     92:     byte0 = 0x80;
                     93: 
                     94:     /* add in the buttons.  a set bit means a button is released: */
                     95:     byte0 |= (TME_MS_MSSYSTEMS5_BUTTON_0
                     96:              | TME_MS_MSSYSTEMS5_BUTTON_1
                     97:              | TME_MS_MSSYSTEMS5_BUTTON_2);
                     98:     buttons = event->tme_mouse_event_buttons;
                     99:     if (buttons & TME_MOUSE_BUTTON_0) {
                    100:       byte0 ^= TME_MS_MSSYSTEMS5_BUTTON_0;
                    101:     }
                    102:     if (buttons & TME_MOUSE_BUTTON_1) {
                    103:       byte0 ^= TME_MS_MSSYSTEMS5_BUTTON_1;
                    104:     }
                    105:     if (buttons & TME_MOUSE_BUTTON_2) {
                    106:       byte0 ^= TME_MS_MSSYSTEMS5_BUTTON_2;
                    107:     }
                    108: 
                    109:     /* put in the deltas.  in the MouseSystems protocol, a negative
                    110:        y delta corresponds to "down" mouse movement: */
                    111:     _tme_ms_mssystems5_delta(event->tme_mouse_event_delta_x,
                    112:                             &packet[1]);
                    113:     _tme_ms_mssystems5_delta(-event->tme_mouse_event_delta_y,
                    114:                             &packet[2]);
                    115: 
                    116:     /* put in the first byte: */
                    117:     packet[0] = byte0;
                    118: 
                    119:     /* copy the packet into the serial buffer: */
                    120:     tme_serial_buffer_copyin(&serial_ms->tme_serial_ms_serial_buffer,
                    121:                             packet,
                    122:                             sizeof(packet),
                    123:                             TME_SERIAL_DATA_NORMAL,
                    124:                             TME_SERIAL_COPY_FULL_IS_OVERRUN);
                    125:   }
                    126: 
                    127:   return (TME_OK);
                    128: }
                    129: 
                    130: /* this initializes MouseSystems serial mouse emulation: */
                    131: int
                    132: _tme_serial_ms_mssystems5_init(struct tme_serial_ms *serial_ms)
                    133: {
                    134:   struct tme_serial_config *config;
                    135: 
                    136:   /* set our type-dependent functions: */
                    137:   serial_ms->tme_serial_ms_type_events = _tme_ms_mssystems5_events;
                    138:   serial_ms->tme_serial_ms_type_serial_ctrl = NULL;
                    139:   serial_ms->tme_serial_ms_type_serial_input = NULL;
                    140: 
                    141:   /* set our serial configuration: */
                    142:   config = &serial_ms->tme_serial_ms_type_config;
                    143:   memset(config, 0, sizeof(*config));
                    144:   config->tme_serial_config_baud = 1200;
                    145:   config->tme_serial_config_bits_data = 8;
                    146:   config->tme_serial_config_bits_stop = 1;
                    147:   config->tme_serial_config_parity = TME_SERIAL_PARITY_NONE;
                    148: 
1.1.1.2 ! root      149:   /* set our rate-limiting: */
        !           150:   serial_ms->tme_serial_ms_rate_usec
        !           151:     = TME_MAX(serial_ms->tme_serial_ms_rate_usec,
        !           152:              (1000000
        !           153:               / (config->tme_serial_config_baud
        !           154:                  / 5 /* size of one packet */)));
        !           155: 
1.1       root      156:   return (TME_OK);
                    157: }

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