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 <linux/export.h>
23 #include <sound/info.h>
24
25 #ifdef CONFIG_PROC_FS
26
snd_opl4_mem_proc_open(struct snd_info_entry * entry,unsigned short mode,void ** file_private_data)27 static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
28 unsigned short mode, void **file_private_data)
29 {
30 struct snd_opl4 *opl4 = entry->private_data;
31
32 mutex_lock(&opl4->access_mutex);
33 if (opl4->memory_access) {
34 mutex_unlock(&opl4->access_mutex);
35 return -EBUSY;
36 }
37 opl4->memory_access++;
38 mutex_unlock(&opl4->access_mutex);
39 return 0;
40 }
41
snd_opl4_mem_proc_release(struct snd_info_entry * entry,unsigned short mode,void * file_private_data)42 static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
43 unsigned short mode, void *file_private_data)
44 {
45 struct snd_opl4 *opl4 = entry->private_data;
46
47 mutex_lock(&opl4->access_mutex);
48 opl4->memory_access--;
49 mutex_unlock(&opl4->access_mutex);
50 return 0;
51 }
52
snd_opl4_mem_proc_read(struct snd_info_entry * entry,void * file_private_data,struct file * file,char __user * _buf,size_t count,loff_t pos)53 static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
54 void *file_private_data,
55 struct file *file, char __user *_buf,
56 size_t count, loff_t pos)
57 {
58 struct snd_opl4 *opl4 = entry->private_data;
59 char* buf;
60
61 buf = vmalloc(count);
62 if (!buf)
63 return -ENOMEM;
64 snd_opl4_read_memory(opl4, buf, pos, count);
65 if (copy_to_user(_buf, buf, count)) {
66 vfree(buf);
67 return -EFAULT;
68 }
69 vfree(buf);
70 return count;
71 }
72
snd_opl4_mem_proc_write(struct snd_info_entry * entry,void * file_private_data,struct file * file,const char __user * _buf,size_t count,loff_t pos)73 static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
74 void *file_private_data,
75 struct file *file,
76 const char __user *_buf,
77 size_t count, loff_t pos)
78 {
79 struct snd_opl4 *opl4 = entry->private_data;
80 char *buf;
81
82 buf = vmalloc(count);
83 if (!buf)
84 return -ENOMEM;
85 if (copy_from_user(buf, _buf, count)) {
86 vfree(buf);
87 return -EFAULT;
88 }
89 snd_opl4_write_memory(opl4, buf, pos, count);
90 vfree(buf);
91 return count;
92 }
93
94 static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
95 .open = snd_opl4_mem_proc_open,
96 .release = snd_opl4_mem_proc_release,
97 .read = snd_opl4_mem_proc_read,
98 .write = snd_opl4_mem_proc_write,
99 };
100
snd_opl4_create_proc(struct snd_opl4 * opl4)101 int snd_opl4_create_proc(struct snd_opl4 *opl4)
102 {
103 struct snd_info_entry *entry;
104
105 entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
106 if (entry) {
107 if (opl4->hardware < OPL3_HW_OPL4_ML) {
108 /* OPL4 can access 4 MB external ROM/SRAM */
109 entry->mode |= S_IWUSR;
110 entry->size = 4 * 1024 * 1024;
111 } else {
112 /* OPL4-ML has 1 MB internal ROM */
113 entry->size = 1 * 1024 * 1024;
114 }
115 entry->content = SNDRV_INFO_CONTENT_DATA;
116 entry->c.ops = &snd_opl4_mem_proc_ops;
117 entry->module = THIS_MODULE;
118 entry->private_data = opl4;
119 if (snd_info_register(entry) < 0) {
120 snd_info_free_entry(entry);
121 entry = NULL;
122 }
123 }
124 opl4->proc_entry = entry;
125 return 0;
126 }
127
snd_opl4_free_proc(struct snd_opl4 * opl4)128 void snd_opl4_free_proc(struct snd_opl4 *opl4)
129 {
130 snd_info_free_entry(opl4->proc_entry);
131 }
132
133 #endif /* CONFIG_PROC_FS */
134