| 1 | /*
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| 2 | * Copyright (c) 2011 Martin Decky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup mouse_proto
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| 30 | * @ingroup input
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| 31 | * @{
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| 32 | */
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| 33 | /**
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| 34 | * @file
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| 35 | * @brief PS/2 protocol driver.
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| 36 | */
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| 37 |
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| 38 | #include <mouse.h>
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| 39 | #include <mouse_port.h>
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| 40 | #include <mouse_proto.h>
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| 41 |
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| 42 | #define PS2_MOUSE_OUT_INIT 0xf4
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| 43 | #define PS2_MOUSE_ACK 0xfa
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| 44 |
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| 45 | #define BUFSIZE 3
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| 46 |
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| 47 | typedef struct {
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| 48 | union {
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| 49 | unsigned char data[BUFSIZE];
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| 50 | struct {
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| 51 | unsigned int leftbtn : 1;
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| 52 | unsigned int rightbtn : 1;
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| 53 | unsigned int middlebtn : 1;
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| 54 | unsigned int isone : 1; /* Always one */
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| 55 | unsigned int xsign : 1;
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| 56 | unsigned int ysign : 1;
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| 57 | unsigned int xovfl : 1;
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| 58 | unsigned int yovfl : 1;
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| 59 | unsigned char x;
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| 60 | unsigned char y;
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| 61 | } val;
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| 62 | } u;
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| 63 | } ps2packet_t;
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| 64 |
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| 65 | static ps2packet_t buf;
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| 66 | static unsigned int bufpos;
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| 67 | static unsigned int leftbtn;
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| 68 | static unsigned int rightbtn;
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| 69 | static unsigned int middlebtn;
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| 70 |
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| 71 | static mouse_dev_t *mouse_dev;
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| 72 |
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| 73 | static int ps2_proto_init(mouse_dev_t *mdev)
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| 74 | {
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| 75 | mouse_dev = mdev;
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| 76 | bufpos = 0;
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| 77 | leftbtn = 0;
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| 78 | rightbtn = 0;
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| 79 |
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| 80 | mouse_dev->port_ops->write(PS2_MOUSE_OUT_INIT);
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| 81 | return 0;
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| 82 | }
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| 83 |
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| 84 | /** Convert 9-bit 2-complement signed number to integer */
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| 85 | static int bit9toint(int sign, unsigned char data)
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| 86 | {
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| 87 | int tmp;
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| 88 |
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| 89 | if (!sign)
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| 90 | return data;
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| 91 |
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| 92 | tmp = ((unsigned char) ~data) + 1;
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| 93 | return -tmp;
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| 94 | }
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| 95 |
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| 96 | /** Process mouse data */
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| 97 | static void ps2_proto_parse(sysarg_t data)
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| 98 | {
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| 99 | int x, y;
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| 100 |
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| 101 | /* Check that we have not lost synchronization */
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| 102 | if (bufpos == 0 && !(data & 0x8))
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| 103 | return; /* Synchro lost, ignore byte */
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| 104 |
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| 105 | buf.u.data[bufpos++] = data;
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| 106 | if (bufpos == BUFSIZE) {
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| 107 | bufpos = 0;
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| 108 |
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| 109 | if (buf.u.val.leftbtn ^ leftbtn) {
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| 110 | leftbtn = buf.u.val.leftbtn;
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| 111 | mouse_push_event_button(mouse_dev, 1, leftbtn);
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| 112 | }
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| 113 |
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| 114 | if (buf.u.val.rightbtn ^ rightbtn) {
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| 115 | rightbtn = buf.u.val.rightbtn;
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| 116 | mouse_push_event_button(mouse_dev, 2, rightbtn);
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| 117 | }
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| 118 |
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| 119 | if (buf.u.val.middlebtn ^ middlebtn) {
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| 120 | middlebtn = buf.u.val.middlebtn;
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| 121 | mouse_push_event_button(mouse_dev, 3, middlebtn);
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| 122 | }
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| 123 |
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| 124 | x = bit9toint(buf.u.val.xsign, buf.u.val.x);
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| 125 | y = -bit9toint(buf.u.val.ysign, buf.u.val.y);
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| 126 |
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| 127 | if (x != 0 || y != 0)
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| 128 | mouse_push_event_move(mouse_dev, x, y);
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| 129 | }
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| 130 | }
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| 131 |
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| 132 | mouse_proto_ops_t ps2_proto = {
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| 133 | .parse = ps2_proto_parse,
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| 134 | .init = ps2_proto_init
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| 135 | };
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| 136 |
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| 137 | /**
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| 138 | * @}
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| 139 | */
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