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
175
176
177
178
179
180
181
182
183
184
|
/*
* lirc_dvb.c: module for lirc support
*
* Copyright (C) 2001 Matthias Hilbig <hilbig@upb.de>
*
* based heavily (copy&paste) on
*
* LIRC Infrared handler by Christoph Martin <martin@uni-mainz.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
*
*/
#include <linux/module.h>
#include <linux/kmod.h>
#include <dvb.h>
/* include lirc_dev headers */
#include <drivers/lirc_dev/lirc_dev.h>
#define SUCCESS 0
#define LOGHEAD "lirc_dvb: "
static int debug = 0;
#define dprintk if (debug) printk
DECLARE_WAIT_QUEUE_HEAD(gpioq);
static int minor = -1;
/* lirc definitions */
static unsigned char code_length = 32;
static unsigned char code_bytes = 1;
/* buffer definitions */
#define IR_BUF_LENGTH 20
#define IR_INC(x) x = (x + 1) % IR_BUF_LENGTH
#define IRB_USED ((irbeg <= irend)?irend-irbeg:IR_BUF_LENGTH-(irbeg-irend))
static u32 irbuf[IR_BUF_LENGTH];
static u8 irbeg, irend;
static spinlock_t irlock = SPIN_LOCK_UNLOCKED;
static inline void irb_enqueue(u32 value) {
u8 lookahead;
spin_lock(&irlock);
lookahead = irend;
IR_INC(lookahead);
if (lookahead != irbeg) { //if its full don't accept further keys
irbuf[irend] = value;
irend = lookahead;
}
spin_unlock(&irlock);
}
static inline u32 irb_dequeue(void) {
u32 value;
static u32 lastvalue = (1<<31);
spin_lock(&irlock);
if (irend == irbeg) {
spin_unlock(&irlock);
return lastvalue;
}
value = lastvalue = irbuf[irbeg];
IR_INC(irbeg);
dprintk(LOGHEAD "buffer used: %d\n",IRB_USED);
spin_unlock(&irlock);
return value;
}
static inline void irb_init(void) {
irbeg = irend = 0;
spin_lock_init(&irlock);
}
/* this function receives irevents from dvb-driver */
void irhandler (u32 ircom) {
dprintk(LOGHEAD "ircom=%08x\n",ircom);
irb_enqueue(ircom);
wake_up_interruptible(&gpioq);
}
static int get_key(void* data, unsigned char *key, int key_no)
{
u32 irdata;
static unsigned char codes[4];
int index = code_bytes - key_no - 1;
if (key_no > 0) {
if (code_bytes < 2 || key_no >= code_bytes) {
dprintk(LOGHEAD "something wrong in get_key\n");
return -EBADRQC;
}
*key = codes[index];
return SUCCESS;
}
irdata = irb_dequeue();
memcpy(codes, &irdata, code_bytes);
*key = codes[index];
return SUCCESS;
}
static wait_queue_head_t* get_queue(void* data)
{
printk(LOGHEAD "get_queue\n");
return &gpioq;
}
static void set_use_inc(void* data)
{
MOD_INC_USE_COUNT;
}
static void set_use_dec(void* data)
{
MOD_DEC_USE_COUNT;
}
static struct lirc_plugin
plugin = {
"lirc_dvb ",
0,
0,
0,
NULL,
get_key,
get_queue,
set_use_inc,
set_use_dec
};
int init_module(void)
{
int ret;
plugin.code_length = code_length;
plugin.minor = minor;
plugin.sample_rate = 10;
irb_init();
request_module("lirc_dev");
code_bytes = (plugin.code_length/8) + (plugin.code_length%8 ? 1 : 0);
init_waitqueue_head(&gpioq);
ret = lirc_register_plugin(&plugin);
if (0 > ret) {
printk (LOGHEAD "device registration failed with %d\n", ret);
return ret;
}
minor = ret;
printk(LOGHEAD "driver registered\n");
dvb_register_irc_handler(irhandler);
return SUCCESS;
}
void cleanup_module(void)
{
int ret;
dvb_unregister_irc_handler(irhandler);
ret = lirc_unregister_plugin(minor);
if (0 > ret) {
printk(LOGHEAD "error in lirc_unregister_minor: %d\n"
"Trying again...\n", ret);
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(HZ);
ret = lirc_unregister_plugin(minor);
if (0 > ret) {
printk(LOGHEAD "error in lirc_unregister_minor: %d!!!\n", ret);
return;
}
}
wake_up(&gpioq);
dprintk("module successfully unloaded\n");
}
|
