1 /*
2 * Functions for the OPL4 proc file
3 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include "opl4_local.h"
21 #include <linux/vmalloc.h>
22 #include <sound/info.h>
23
24 #ifdef CONFIG_PROC_FS
25
26 static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
27 unsigned short mode, void **file_private_data)
28 {
29 struct snd_opl4 *opl4 = entry->private_data;
30
31 mutex_lock(&opl4->access_mutex);
32 if (opl4->memory_access) {
33 mutex_unlock(&opl4->access_mutex);
34 return -EBUSY;
35 }
36 opl4->memory_access++;
37 mutex_unlock(&opl4->access_mutex);
38 return 0;
39 }
40
41 static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
42 unsigned short mode, void *file_private_data)
43 {
44 struct snd_opl4 *opl4 = entry->private_data;
45
46 mutex_lock(&opl4->access_mutex);
47 opl4->memory_access--;
48 mutex_unlock(&opl4->access_mutex);
49 return 0;
50 }
51
52 static long snd_opl4_mem_proc_read(struct snd_info_entry *entry, void *file_private_data,
53 struct file *file, char __user *_buf,
54 unsigned long count, unsigned long pos)
55 {
56 struct snd_opl4 *opl4 = entry->private_data;
57 long size;
58 char* buf;
59
60 size = count;
61 if (pos + size > entry->size)
62 size = entry->size - pos;
63 if (size > 0) {
64 buf = vmalloc(size);
65 if (!buf)
66 return -ENOMEM;
67 snd_opl4_read_memory(opl4, buf, pos, size);
68 if (copy_to_user(_buf, buf, size)) {
69 vfree(buf);
70 return -EFAULT;
71 }
72 vfree(buf);
73 return size;
74 }
75 return 0;
76 }
77
78 static long snd_opl4_mem_proc_write(struct snd_info_entry *entry, void *file_private_data,
79 struct file *file, const char __user *_buf,
80 unsigned long count, unsigned long pos)
81 {
82 struct snd_opl4 *opl4 = entry->private_data;
83 long size;
84 char *buf;
85
86 size = count;
87 if (pos + size > entry->size)
88 size = entry->size - pos;
89 if (size > 0) {
90 buf = vmalloc(size);
91 if (!buf)
92 return -ENOMEM;
93 if (copy_from_user(buf, _buf, size)) {
94 vfree(buf);
95 return -EFAULT;
96 }
97 snd_opl4_write_memory(opl4, buf, pos, size);
98 vfree(buf);
99 return size;
100 }
101 return 0;
102 }
103
104 static long long snd_opl4_mem_proc_llseek(struct snd_info_entry *entry, void *file_private_data,
105 struct file *file, long long offset, int orig)
106 {
107 switch (orig) {
108 case SEEK_SET:
109 file->f_pos = offset;
110 break;
111 case SEEK_CUR:
112 file->f_pos += offset;
113 break;
114 case SEEK_END: /* offset is negative */
115 file->f_pos = entry->size + offset;
116 break;
117 default:
118 return -EINVAL;
119 }
120 if (file->f_pos > entry->size)
121 file->f_pos = entry->size;
122 return file->f_pos;
123 }
124
125 static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
126 .open = snd_opl4_mem_proc_open,
127 .release = snd_opl4_mem_proc_release,
128 .read = snd_opl4_mem_proc_read,
129 .write = snd_opl4_mem_proc_write,
130 .llseek = snd_opl4_mem_proc_llseek,
131 };
132
133 int snd_opl4_create_proc(struct snd_opl4 *opl4)
134 {
135 struct snd_info_entry *entry;
136
137 entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
138 if (entry) {
139 if (opl4->hardware < OPL3_HW_OPL4_ML) {
140 /* OPL4 can access 4 MB external ROM/SRAM */
141 entry->mode |= S_IWUSR;
142 entry->size = 4 * 1024 * 1024;
143 } else {
144 /* OPL4-ML has 1 MB internal ROM */
145 entry->size = 1 * 1024 * 1024;
146 }
147 entry->content = SNDRV_INFO_CONTENT_DATA;
148 entry->c.ops = &snd_opl4_mem_proc_ops;
149 entry->module = THIS_MODULE;
150 entry->private_data = opl4;
151 if (snd_info_register(entry) < 0) {
152 snd_info_free_entry(entry);
153 entry = NULL;
154 }
155 }
156 opl4->proc_entry = entry;
157 return 0;
158 }
159
160 void snd_opl4_free_proc(struct snd_opl4 *opl4)
161 {
162 snd_info_free_entry(opl4->proc_entry);
163 }
164
165 #endif /* CONFIG_PROC_FS */
166
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