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1da177e4 LT |
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 <sound/info.h> | |
23 | ||
24 | #ifdef CONFIG_PROC_FS | |
25 | ||
26 | static int snd_opl4_mem_proc_open(snd_info_entry_t *entry, | |
27 | unsigned short mode, void **file_private_data) | |
28 | { | |
29 | opl4_t *opl4 = entry->private_data; | |
30 | ||
31 | down(&opl4->access_mutex); | |
32 | if (opl4->memory_access) { | |
33 | up(&opl4->access_mutex); | |
34 | return -EBUSY; | |
35 | } | |
36 | opl4->memory_access++; | |
37 | up(&opl4->access_mutex); | |
38 | return 0; | |
39 | } | |
40 | ||
41 | static int snd_opl4_mem_proc_release(snd_info_entry_t *entry, | |
42 | unsigned short mode, void *file_private_data) | |
43 | { | |
44 | opl4_t *opl4 = entry->private_data; | |
45 | ||
46 | down(&opl4->access_mutex); | |
47 | opl4->memory_access--; | |
48 | up(&opl4->access_mutex); | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static long snd_opl4_mem_proc_read(snd_info_entry_t *entry, void *file_private_data, | |
53 | struct file *file, char __user *_buf, | |
54 | unsigned long count, unsigned long pos) | |
55 | { | |
56 | opl4_t *opl4 = entry->private_data; | |
57 | long size; | |
58 | char* buf; | |
59 | ||
60 | size = count; | |
61 | if (pos + size > entry->size) | |
62 | size = entry->size - pos; | |
63 | if (size > 0) { | |
64 | buf = vmalloc(size); | |
65 | if (!buf) | |
66 | return -ENOMEM; | |
67 | snd_opl4_read_memory(opl4, buf, pos, size); | |
68 | if (copy_to_user(_buf, buf, size)) { | |
69 | vfree(buf); | |
70 | return -EFAULT; | |
71 | } | |
72 | vfree(buf); | |
73 | return size; | |
74 | } | |
75 | return 0; | |
76 | } | |
77 | ||
78 | static long snd_opl4_mem_proc_write(snd_info_entry_t *entry, void *file_private_data, | |
79 | struct file *file, const char __user *_buf, | |
80 | unsigned long count, unsigned long pos) | |
81 | { | |
82 | opl4_t *opl4 = entry->private_data; | |
83 | long size; | |
84 | char *buf; | |
85 | ||
86 | size = count; | |
87 | if (pos + size > entry->size) | |
88 | size = entry->size - pos; | |
89 | if (size > 0) { | |
90 | buf = vmalloc(size); | |
91 | if (!buf) | |
92 | return -ENOMEM; | |
93 | if (copy_from_user(buf, _buf, size)) { | |
94 | vfree(buf); | |
95 | return -EFAULT; | |
96 | } | |
97 | snd_opl4_write_memory(opl4, buf, pos, size); | |
98 | vfree(buf); | |
99 | return size; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static long long snd_opl4_mem_proc_llseek(snd_info_entry_t *entry, void *file_private_data, | |
105 | struct file *file, long long offset, int orig) | |
106 | { | |
107 | switch (orig) { | |
108 | case 0: /* SEEK_SET */ | |
109 | file->f_pos = offset; | |
110 | break; | |
111 | case 1: /* SEEK_CUR */ | |
112 | file->f_pos += offset; | |
113 | break; | |
114 | case 2: /* SEEK_END, offset is negative */ | |
115 | file->f_pos = entry->size + offset; | |
116 | break; | |
117 | default: | |
118 | return -EINVAL; | |
119 | } | |
120 | if (file->f_pos > entry->size) | |
121 | file->f_pos = entry->size; | |
122 | return file->f_pos; | |
123 | } | |
124 | ||
125 | static struct snd_info_entry_ops snd_opl4_mem_proc_ops = { | |
126 | .open = snd_opl4_mem_proc_open, | |
127 | .release = snd_opl4_mem_proc_release, | |
128 | .read = snd_opl4_mem_proc_read, | |
129 | .write = snd_opl4_mem_proc_write, | |
130 | .llseek = snd_opl4_mem_proc_llseek, | |
131 | }; | |
132 | ||
133 | int snd_opl4_create_proc(opl4_t *opl4) | |
134 | { | |
135 | snd_info_entry_t *entry; | |
136 | ||
137 | entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root); | |
138 | if (entry) { | |
139 | if (opl4->hardware < OPL3_HW_OPL4_ML) { | |
140 | /* OPL4 can access 4 MB external ROM/SRAM */ | |
141 | entry->mode |= S_IWUSR; | |
142 | entry->size = 4 * 1024 * 1024; | |
143 | } else { | |
144 | /* OPL4-ML has 1 MB internal ROM */ | |
145 | entry->size = 1 * 1024 * 1024; | |
146 | } | |
147 | entry->content = SNDRV_INFO_CONTENT_DATA; | |
148 | entry->c.ops = &snd_opl4_mem_proc_ops; | |
149 | entry->module = THIS_MODULE; | |
150 | entry->private_data = opl4; | |
151 | if (snd_info_register(entry) < 0) { | |
152 | snd_info_free_entry(entry); | |
153 | entry = NULL; | |
154 | } | |
155 | } | |
156 | opl4->proc_entry = entry; | |
157 | return 0; | |
158 | } | |
159 | ||
160 | void snd_opl4_free_proc(opl4_t *opl4) | |
161 | { | |
162 | if (opl4->proc_entry) | |
163 | snd_info_unregister(opl4->proc_entry); | |
164 | } | |
165 | ||
166 | #endif /* CONFIG_PROC_FS */ |