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
snd_opl4_mem_proc_open(struct snd_info_entry * entry,unsigned short mode,void ** file_private_data)25 static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
26 unsigned short mode, void **file_private_data)
27 {
28 struct snd_opl4 *opl4 = entry->private_data;
29
30 mutex_lock(&opl4->access_mutex);
31 if (opl4->memory_access) {
32 mutex_unlock(&opl4->access_mutex);
33 return -EBUSY;
34 }
35 opl4->memory_access++;
36 mutex_unlock(&opl4->access_mutex);
37 return 0;
38 }
39
snd_opl4_mem_proc_release(struct snd_info_entry * entry,unsigned short mode,void * file_private_data)40 static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
41 unsigned short mode, void *file_private_data)
42 {
43 struct snd_opl4 *opl4 = entry->private_data;
44
45 mutex_lock(&opl4->access_mutex);
46 opl4->memory_access--;
47 mutex_unlock(&opl4->access_mutex);
48 return 0;
49 }
50
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)51 static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
52 void *file_private_data,
53 struct file *file, char __user *_buf,
54 size_t count, loff_t pos)
55 {
56 struct snd_opl4 *opl4 = entry->private_data;
57 char* buf;
58
59 buf = vmalloc(count);
60 if (!buf)
61 return -ENOMEM;
62 snd_opl4_read_memory(opl4, buf, pos, count);
63 if (copy_to_user(_buf, buf, count)) {
64 vfree(buf);
65 return -EFAULT;
66 }
67 vfree(buf);
68 return count;
69 }
70
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)71 static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
72 void *file_private_data,
73 struct file *file,
74 const char __user *_buf,
75 size_t count, loff_t pos)
76 {
77 struct snd_opl4 *opl4 = entry->private_data;
78 char *buf;
79
80 buf = vmalloc(count);
81 if (!buf)
82 return -ENOMEM;
83 if (copy_from_user(buf, _buf, count)) {
84 vfree(buf);
85 return -EFAULT;
86 }
87 snd_opl4_write_memory(opl4, buf, pos, count);
88 vfree(buf);
89 return count;
90 }
91
92 static struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
93 .open = snd_opl4_mem_proc_open,
94 .release = snd_opl4_mem_proc_release,
95 .read = snd_opl4_mem_proc_read,
96 .write = snd_opl4_mem_proc_write,
97 };
98
snd_opl4_create_proc(struct snd_opl4 * opl4)99 int snd_opl4_create_proc(struct snd_opl4 *opl4)
100 {
101 struct snd_info_entry *entry;
102
103 entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
104 if (entry) {
105 if (opl4->hardware < OPL3_HW_OPL4_ML) {
106 /* OPL4 can access 4 MB external ROM/SRAM */
107 entry->mode |= 0200;
108 entry->size = 4 * 1024 * 1024;
109 } else {
110 /* OPL4-ML has 1 MB internal ROM */
111 entry->size = 1 * 1024 * 1024;
112 }
113 entry->content = SNDRV_INFO_CONTENT_DATA;
114 entry->c.ops = &snd_opl4_mem_proc_ops;
115 entry->module = THIS_MODULE;
116 entry->private_data = opl4;
117 if (snd_info_register(entry) < 0) {
118 snd_info_free_entry(entry);
119 entry = NULL;
120 }
121 }
122 opl4->proc_entry = entry;
123 return 0;
124 }
125
snd_opl4_free_proc(struct snd_opl4 * opl4)126 void snd_opl4_free_proc(struct snd_opl4 *opl4)
127 {
128 snd_info_free_entry(opl4->proc_entry);
129 }
130
