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
snd_opl4_mem_proc_open(struct snd_info_entry * entry,unsigned short mode,void ** file_private_data)12 static 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(&opl4->access_mutex);
20 return -EBUSY;
21 }
22 opl4->memory_access++;
23 mutex_unlock(&opl4->access_mutex);
24 return 0;
25 }
26
snd_opl4_mem_proc_release(struct snd_info_entry * entry,unsigned short mode,void * file_private_data)27 static 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(&opl4->access_mutex);
35 return 0;
36 }
37
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)38 static 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(count);
47 if (!buf)
48 return -ENOMEM;
49 snd_opl4_read_memory(opl4, buf, pos, count);
50 if (copy_to_user(_buf, buf, count)) {
51 vfree(buf);
52 return -EFAULT;
53 }
54 vfree(buf);
55 return count;
56 }
57
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)58 static 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(count);
68 if (!buf)
69 return -ENOMEM;
70 if (copy_from_user(buf, _buf, count)) {
71 vfree(buf);
72 return -EFAULT;
73 }
74 snd_opl4_write_memory(opl4, buf, pos, count);
75 vfree(buf);
76 return count;
77 }
78
79 static 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
snd_opl4_create_proc(struct snd_opl4 * opl4)86 int snd_opl4_create_proc(struct snd_opl4 *opl4)
87 {
88 struct snd_info_entry *entry;
89
90 entry = snd_info_create_card_entry(opl4->card, "opl4-mem", 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
snd_opl4_free_proc(struct snd_opl4 * opl4)109 void snd_opl4_free_proc(struct snd_opl4 *opl4)
110 {
111 snd_info_free_entry(opl4->proc_entry);
112 }
113