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(&opl4->access_mutex);
20		return -EBUSY;
21	}
22	opl4->memory_access++;
23	mutex_unlock(&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(&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(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
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(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
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(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
109void snd_opl4_free_proc(struct snd_opl4 *opl4)
110{
111	snd_info_free_entry(opl4->proc_entry);
112}
113