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
27static 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
42static 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
53static 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
73static 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
94static 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
101int 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
128void 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