1 /*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * GUS's memory access via proc filesystem
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/slab.h>
23 #include <sound/core.h>
24 #include <sound/gus.h>
25 #include <sound/info.h>
26
27 struct gus_proc_private {
28 int rom; /* data are in ROM */
29 unsigned int address;
30 unsigned int size;
31 struct snd_gus_card * gus;
32 };
33
34 static long snd_gf1_mem_proc_dump(struct snd_info_entry *entry, void *file_private_data,
35 struct file *file, char __user *buf,
36 unsigned long count, unsigned long pos)
37 {
38 long size;
39 struct gus_proc_private *priv = entry->private_data;
40 struct snd_gus_card *gus = priv->gus;
41 int err;
42
43 size = count;
44 if (pos + size > priv->size)
45 size = (long)priv->size - pos;
46 if (size > 0) {
47 if ((err = snd_gus_dram_read(gus, buf, pos, size, priv->rom)) < 0)
48 return err;
49 return size;
50 }
51 return 0;
52 }
53
54 static long long snd_gf1_mem_proc_llseek(struct snd_info_entry *entry,
55 void *private_file_data,
56 struct file *file,
57 long long offset,
58 int orig)
59 {
60 struct gus_proc_private *priv = entry->private_data;
61
62 switch (orig) {
63 case SEEK_SET:
64 file->f_pos = offset;
65 break;
66 case SEEK_CUR:
67 file->f_pos += offset;
68 break;
69 case SEEK_END: /* offset is negative */
70 file->f_pos = priv->size + offset;
71 break;
72 default:
73 return -EINVAL;
74 }
75 if (file->f_pos > priv->size)
76 file->f_pos = priv->size;
77 return file->f_pos;
78 }
79
80 static void snd_gf1_mem_proc_free(struct snd_info_entry *entry)
81 {
82 struct gus_proc_private *priv = entry->private_data;
83 kfree(priv);
84 }
85
86 static struct snd_info_entry_ops snd_gf1_mem_proc_ops = {
87 .read = snd_gf1_mem_proc_dump,
88 .llseek = snd_gf1_mem_proc_llseek,
89 };
90
91 int snd_gf1_mem_proc_init(struct snd_gus_card * gus)
92 {
93 int idx;
94 char name[16];
95 struct gus_proc_private *priv;
96 struct snd_info_entry *entry;
97
98 for (idx = 0; idx < 4; idx++) {
99 if (gus->gf1.mem_alloc.banks_8[idx].size > 0) {
100 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
101 if (priv == NULL)
102 return -ENOMEM;
103 priv->gus = gus;
104 sprintf(name, "gus-ram-%i", idx);
105 if (! snd_card_proc_new(gus->card, name, &entry)) {
106 entry->content = SNDRV_INFO_CONTENT_DATA;
107 entry->private_data = priv;
108 entry->private_free = snd_gf1_mem_proc_free;
109 entry->c.ops = &snd_gf1_mem_proc_ops;
110 priv->address = gus->gf1.mem_alloc.banks_8[idx].address;
111 priv->size = entry->size = gus->gf1.mem_alloc.banks_8[idx].size;
112 }
113 }
114 }
115 for (idx = 0; idx < 4; idx++) {
116 if (gus->gf1.rom_present & (1 << idx)) {
117 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
118 if (priv == NULL)
119 return -ENOMEM;
120 priv->rom = 1;
121 priv->gus = gus;
122 sprintf(name, "gus-rom-%i", idx);
123 if (! snd_card_proc_new(gus->card, name, &entry)) {
124 entry->content = SNDRV_INFO_CONTENT_DATA;
125 entry->private_data = priv;
126 entry->private_free = snd_gf1_mem_proc_free;
127 entry->c.ops = &snd_gf1_mem_proc_ops;
128 priv->address = idx * 4096 * 1024;
129 priv->size = entry->size = gus->gf1.rom_memory;
130 }
131 }
132 }
133 return 0;
134 }
135
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