1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
* Copyright (c) 1997 Metro Link Incorporated
*
* 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 X CONSORTIUM 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.
*
* Except as contained in this notice, the name of the Metro Link shall not be
* used in advertising or otherwise to promote the sale, use or other dealings
* in this Software without prior written authorization from Metro Link.
*
*/
/*
X Input Serial Buffer routines for use in any XInput driver that accesses
a serial device.
*/
/*****************************************************************************
* Standard Headers
****************************************************************************/
#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif
#include <misc.h>
#include <xf86.h>
#include <xf86_OSproc.h>
#include <xf86_OSlib.h>
#include <xf86Xinput.h>
#include "xisb.h"
/*****************************************************************************
* Local Headers
****************************************************************************/
/*****************************************************************************
* Variables without includable headers
****************************************************************************/
/*****************************************************************************
* Local Variables
****************************************************************************/
/*****************************************************************************
* Function Definitions
****************************************************************************/
XISBuffer *
XisbNew (int fd, ssize_t size)
{
XISBuffer *b;
b = xalloc (sizeof (XISBuffer));
if (!b)
return (NULL);
b->buf = xalloc ((sizeof (unsigned char) * size));
if (!b->buf)
{
xfree (b);
return (NULL);
}
b->fd = fd;
b->trace = 0;
b->block_duration = 0;
b->current = 1; /* force it to be past the end to trigger initial read */
b->end = 0;
b->buffer_size = size;
return (b);
}
void
XisbFree (XISBuffer *b)
{
xfree (b->buf);
xfree (b);
}
int
XisbRead (XISBuffer *b)
{
int ret;
if (b->current >= b->end)
{
if (b->block_duration >= 0)
{
if (xf86WaitForInput (b->fd, b->block_duration) < 1)
return (-1);
}
else
{
/*
* automatically clear it so if XisbRead is called in a loop
* the next call will make sure there is data with select and
* thus prevent a blocking read
*/
b->block_duration = 0;
}
ret = xf86ReadSerial (b->fd, b->buf, b->buffer_size);
switch (ret)
{
case 0:
return (-1); /* timeout */
case -1:
return (-2); /* error */
default:
b->end = ret;
b->current = 0;
break;
}
}
if (b->trace)
ErrorF ("read 0x%02x (%c)\n", b->buf[b->current],
isprint(b->buf[b->current])?b->buf[b->current]:'.');
return (b->buf[b->current++]);
}
/* the only purpose of this function is to provide output tracing */
ssize_t
XisbWrite (XISBuffer *b, unsigned char *msg, ssize_t len)
{
if (b->trace)
{
int i = 0;
for (i = 0; i < len; i++)
ErrorF ("\t\twrote 0x%02x (%c)\n", msg[i], msg[i]);
}
return (xf86WriteSerial (b->fd, msg, len));
}
/* turn tracing of this buffer on (1) or off (0) */
void
XisbTrace (XISBuffer *b, int trace)
{
b->trace = trace;
}
/*
* specify a block_duration of -1 when you know the buffer's fd is ready to
* read. After a read, it is automatically set to 0 so that the next read
* will use check to select for data and prevent a block.
* It is the caller's responsibility to set the block_duration to -1 if it
* knows that there is data to read (because the main select loop triggered
* the read) and want's to avoid the unnecessary overhead of the select call
*
* a zero or positive block duration will cause the select to block for the
* give duration in usecs.
*/
void
XisbBlockDuration (XISBuffer *b, int block_duration)
{
b->block_duration = block_duration;
}
|
