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
|
/*
* Functions for the OPL4 proc file
* Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.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
*/
#include "opl4_local.h"
#include <linux/vmalloc.h>
#include <sound/info.h>
#ifdef CONFIG_PROC_FS
static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
unsigned short mode, void **file_private_data)
{
struct snd_opl4 *opl4 = entry->private_data;
down(&opl4->access_mutex);
if (opl4->memory_access) {
up(&opl4->access_mutex);
return -EBUSY;
}
opl4->memory_access++;
up(&opl4->access_mutex);
return 0;
}
static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
unsigned short mode, void *file_private_data)
{
struct snd_opl4 *opl4 = entry->private_data;
down(&opl4->access_mutex);
opl4->memory_access--;
up(&opl4->access_mutex);
return 0;
}
static long snd_opl4_mem_proc_read(struct snd_info_entry *entry, void *file_private_data,
struct file *file, char __user *_buf,
unsigned long count, unsigned long pos)
{
struct snd_opl4 *opl4 = entry->private_data;
long size;
char* buf;
size = count;
if (pos + size > entry->size)
size = entry->size - pos;
if (size > 0) {
buf = vmalloc(size);
if (!buf)
return -ENOMEM;
snd_opl4_read_memory(opl4, buf, pos, size);
if (copy_to_user(_buf, buf, size)) {
vfree(buf);
return -EFAULT;
}
vfree(buf);
return size;
}
return 0;
}
static long snd_opl4_mem_proc_write(struct snd_info_entry *entry, void *file_private_data,
struct file *file, const char __user *_buf,
unsigned long count, unsigned long pos)
{
struct snd_opl4 *opl4 = entry->private_data;
long size;
char *buf;
size = count;
if (pos + size > entry->size)
size = entry->size - pos;
if (size > 0) {
buf = vmalloc(size);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf, _buf, size)) {
vfree(buf);
return -EFAULT;
}
snd_opl4_write_memory(opl4, buf, pos, size);
vfree(buf);
return size;
}
return 0;
}
static long long snd_opl4_mem_proc_llseek(struct snd_info_entry *entry, void *file_private_data,
struct file *file, long long offset, int orig)
{
switch (orig) {
case 0: /* SEEK_SET */
file->f_pos = offset;
break;
case 1: /* SEEK_CUR */
file->f_pos += offset;
break;
case 2: /* SEEK_END, offset is negative */
file->f_pos = entry->size + offset;
break;
default:
return -EINVAL;
}
if (file->f_pos > entry->size)
file->f_pos = entry->size;
return file->f_pos;
}
static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
.open = snd_opl4_mem_proc_open,
.release = snd_opl4_mem_proc_release,
.read = snd_opl4_mem_proc_read,
.write = snd_opl4_mem_proc_write,
.llseek = snd_opl4_mem_proc_llseek,
};
int snd_opl4_create_proc(struct snd_opl4 *opl4)
{
struct snd_info_entry *entry;
entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
if (entry) {
if (opl4->hardware < OPL3_HW_OPL4_ML) {
/* OPL4 can access 4 MB external ROM/SRAM */
entry->mode |= S_IWUSR;
entry->size = 4 * 1024 * 1024;
} else {
/* OPL4-ML has 1 MB internal ROM */
entry->size = 1 * 1024 * 1024;
}
entry->content = SNDRV_INFO_CONTENT_DATA;
entry->c.ops = &snd_opl4_mem_proc_ops;
entry->module = THIS_MODULE;
entry->private_data = opl4;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
opl4->proc_entry = entry;
return 0;
}
void snd_opl4_free_proc(struct snd_opl4 *opl4)
{
if (opl4->proc_entry)
snd_info_unregister(opl4->proc_entry);
}
#endif /* CONFIG_PROC_FS */
|
