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