Merge branch 'topic/bkl' into topic/core-cleanup
[linux-2.6.git] / sound / isa / gus / gus_mem_proc.c
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 }