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a09e091a JB |
1 | /* |
2 | * Copyright (c) 1997 Metro Link Incorporated | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | * | |
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
17 | * THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
18 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF | |
19 | * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
20 | * SOFTWARE. | |
21 | * | |
22 | * Except as contained in this notice, the name of the Metro Link shall not be | |
23 | * used in advertising or otherwise to promote the sale, use or other dealings | |
24 | * in this Software without prior written authorization from Metro Link. | |
25 | * | |
26 | */ | |
27 | ||
28 | /* | |
29 | X Input Serial Buffer routines for use in any XInput driver that accesses | |
30 | a serial device. | |
31 | */ | |
32 | ||
33 | /***************************************************************************** | |
34 | * Standard Headers | |
35 | ****************************************************************************/ | |
36 | ||
37 | #ifdef HAVE_XORG_CONFIG_H | |
38 | #include <xorg-config.h> | |
39 | #endif | |
40 | ||
41 | #include <misc.h> | |
42 | #include <xf86.h> | |
43 | #include <xf86_OSproc.h> | |
44 | #include <xf86_OSlib.h> | |
45 | #include <xf86Xinput.h> | |
46 | #include "xisb.h" | |
47 | ||
48 | /***************************************************************************** | |
49 | * Local Headers | |
50 | ****************************************************************************/ | |
51 | ||
52 | /***************************************************************************** | |
53 | * Variables without includable headers | |
54 | ****************************************************************************/ | |
55 | ||
56 | /***************************************************************************** | |
57 | * Local Variables | |
58 | ****************************************************************************/ | |
59 | ||
60 | /***************************************************************************** | |
61 | * Function Definitions | |
62 | ****************************************************************************/ | |
63 | ||
64 | XISBuffer * | |
65 | XisbNew(int fd, ssize_t size) | |
66 | { | |
67 | XISBuffer *b; | |
68 | ||
69 | b = malloc(sizeof(XISBuffer)); | |
70 | if (!b) | |
71 | return NULL; | |
72 | b->buf = malloc((sizeof(unsigned char) * size)); | |
73 | if (!b->buf) { | |
74 | free(b); | |
75 | return NULL; | |
76 | } | |
77 | ||
78 | b->fd = fd; | |
79 | b->trace = 0; | |
80 | b->block_duration = 0; | |
81 | b->current = 1; /* force it to be past the end to trigger initial read */ | |
82 | b->end = 0; | |
83 | b->buffer_size = size; | |
84 | return b; | |
85 | } | |
86 | ||
87 | void | |
88 | XisbFree(XISBuffer * b) | |
89 | { | |
90 | free(b->buf); | |
91 | free(b); | |
92 | } | |
93 | ||
94 | int | |
95 | XisbRead(XISBuffer * b) | |
96 | { | |
97 | int ret; | |
98 | ||
99 | if (b->current >= b->end) { | |
100 | if (b->block_duration >= 0) { | |
101 | if (xf86WaitForInput(b->fd, b->block_duration) < 1) | |
102 | return -1; | |
103 | } | |
104 | else { | |
105 | /* | |
106 | * automatically clear it so if XisbRead is called in a loop | |
107 | * the next call will make sure there is data with select and | |
108 | * thus prevent a blocking read | |
109 | */ | |
110 | b->block_duration = 0; | |
111 | } | |
112 | ||
113 | ret = xf86ReadSerial(b->fd, b->buf, b->buffer_size); | |
114 | switch (ret) { | |
115 | case 0: | |
116 | return -1; /* timeout */ | |
117 | case -1: | |
118 | return -2; /* error */ | |
119 | default: | |
120 | b->end = ret; | |
121 | b->current = 0; | |
122 | break; | |
123 | } | |
124 | } | |
125 | if (b->trace) | |
126 | ErrorF("read 0x%02x (%c)\n", b->buf[b->current], | |
127 | isprint(b->buf[b->current]) ? b->buf[b->current] : '.'); | |
128 | ||
129 | return b->buf[b->current++]; | |
130 | } | |
131 | ||
132 | /* the only purpose of this function is to provide output tracing */ | |
133 | ssize_t | |
134 | XisbWrite(XISBuffer * b, unsigned char *msg, ssize_t len) | |
135 | { | |
136 | if (b->trace) { | |
137 | int i = 0; | |
138 | ||
139 | for (i = 0; i < len; i++) | |
140 | ErrorF("\t\twrote 0x%02x (%c)\n", msg[i], msg[i]); | |
141 | } | |
142 | return (xf86WriteSerial(b->fd, msg, len)); | |
143 | } | |
144 | ||
145 | /* turn tracing of this buffer on (1) or off (0) */ | |
146 | void | |
147 | XisbTrace(XISBuffer * b, int trace) | |
148 | { | |
149 | b->trace = trace; | |
150 | } | |
151 | ||
152 | /* | |
153 | * specify a block_duration of -1 when you know the buffer's fd is ready to | |
154 | * read. After a read, it is automatically set to 0 so that the next read | |
155 | * will use check to select for data and prevent a block. | |
156 | * It is the caller's responsibility to set the block_duration to -1 if it | |
157 | * knows that there is data to read (because the main select loop triggered | |
158 | * the read) and want's to avoid the unnecessary overhead of the select call | |
159 | * | |
160 | * a zero or positive block duration will cause the select to block for the | |
161 | * give duration in usecs. | |
162 | */ | |
163 | ||
164 | void | |
165 | XisbBlockDuration(XISBuffer * b, int block_duration) | |
166 | { | |
167 | b->block_duration = block_duration; | |
168 | } |