1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Functions for the OPL4 proc file
4 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
5 */
6
7#include "opl4_local.h"
8#include <linux/vmalloc.h>
9#include <linux/export.h>
10#include <sound/info.h>
11
12static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
13 unsigned short mode, void **file_private_data)
14{
15 struct snd_opl4 *opl4 = entry->private_data;
16
17 mutex_lock(&opl4->access_mutex);
18 if (opl4->memory_access) {
19 mutex_unlock(lock: &opl4->access_mutex);
20 return -EBUSY;
21 }
22 opl4->memory_access++;
23 mutex_unlock(lock: &opl4->access_mutex);
24 return 0;
25}
26
27static int snd_opl4_mem_proc_release(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 opl4->memory_access--;
34 mutex_unlock(lock: &opl4->access_mutex);
35 return 0;
36}
37
38static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
39 void *file_private_data,
40 struct file *file, char __user *_buf,
41 size_t count, loff_t pos)
42{
43 struct snd_opl4 *opl4 = entry->private_data;
44 char* buf;
45
46 buf = vmalloc(size: count);
47 if (!buf)
48 return -ENOMEM;
49 snd_opl4_read_memory(opl4, buf, offset: pos, size: count);
50 if (copy_to_user(to: _buf, from: buf, n: count)) {
51 vfree(addr: buf);
52 return -EFAULT;
53 }
54 vfree(addr: buf);
55 return count;
56}
57
58static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
59 void *file_private_data,
60 struct file *file,
61 const char __user *_buf,
62 size_t count, loff_t pos)
63{
64 struct snd_opl4 *opl4 = entry->private_data;
65 char *buf;
66
67 buf = vmalloc(size: count);
68 if (!buf)
69 return -ENOMEM;
70 if (copy_from_user(to: buf, from: _buf, n: count)) {
71 vfree(addr: buf);
72 return -EFAULT;
73 }
74 snd_opl4_write_memory(opl4, buf, offset: pos, size: count);
75 vfree(addr: buf);
76 return count;
77}
78
79static const struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
80 .open = snd_opl4_mem_proc_open,
81 .release = snd_opl4_mem_proc_release,
82 .read = snd_opl4_mem_proc_read,
83 .write = snd_opl4_mem_proc_write,
84};
85
86int snd_opl4_create_proc(struct snd_opl4 *opl4)
87{
88 struct snd_info_entry *entry;
89
90 entry = snd_info_create_card_entry(card: opl4->card, name: "opl4-mem", parent: opl4->card->proc_root);
91 if (entry) {
92 if (opl4->hardware < OPL3_HW_OPL4_ML) {
93 /* OPL4 can access 4 MB external ROM/SRAM */
94 entry->mode |= 0200;
95 entry->size = 4 * 1024 * 1024;
96 } else {
97 /* OPL4-ML has 1 MB internal ROM */
98 entry->size = 1 * 1024 * 1024;
99 }
100 entry->content = SNDRV_INFO_CONTENT_DATA;
101 entry->c.ops = &snd_opl4_mem_proc_ops;
102 entry->module = THIS_MODULE;
103 entry->private_data = opl4;
104 }
105 opl4->proc_entry = entry;
106 return 0;
107}
108
109void snd_opl4_free_proc(struct snd_opl4 *opl4)
110{
111 snd_info_free_entry(entry: opl4->proc_entry);
112}
113

source code of linux/sound/drivers/opl4/opl4_proc.c