Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[muen/linux.git] / sound / core / info_oss.c
1 /*
2  *  Information interface for ALSA driver
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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 <linux/time.h>
24 #include <linux/string.h>
25 #include <linux/export.h>
26 #include <sound/core.h>
27 #include <sound/minors.h>
28 #include <sound/info.h>
29 #include <linux/utsname.h>
30 #include <linux/mutex.h>
31
32 /*
33  *  OSS compatible part
34  */
35
36 static DEFINE_MUTEX(strings);
37 static char *snd_sndstat_strings[SNDRV_CARDS][SNDRV_OSS_INFO_DEV_COUNT];
38
39 int snd_oss_info_register(int dev, int num, char *string)
40 {
41         char *x;
42
43         if (snd_BUG_ON(dev < 0 || dev >= SNDRV_OSS_INFO_DEV_COUNT))
44                 return -ENXIO;
45         if (snd_BUG_ON(num < 0 || num >= SNDRV_CARDS))
46                 return -ENXIO;
47         mutex_lock(&strings);
48         if (string == NULL) {
49                 if ((x = snd_sndstat_strings[num][dev]) != NULL) {
50                         kfree(x);
51                         x = NULL;
52                 }
53         } else {
54                 x = kstrdup(string, GFP_KERNEL);
55                 if (x == NULL) {
56                         mutex_unlock(&strings);
57                         return -ENOMEM;
58                 }
59         }
60         snd_sndstat_strings[num][dev] = x;
61         mutex_unlock(&strings);
62         return 0;
63 }
64
65 EXPORT_SYMBOL(snd_oss_info_register);
66
67 static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int dev)
68 {
69         int idx, ok = -1;
70         char *str;
71
72         snd_iprintf(buf, "\n%s:", id);
73         mutex_lock(&strings);
74         for (idx = 0; idx < SNDRV_CARDS; idx++) {
75                 str = snd_sndstat_strings[idx][dev];
76                 if (str) {
77                         if (ok < 0) {
78                                 snd_iprintf(buf, "\n");
79                                 ok++;
80                         }
81                         snd_iprintf(buf, "%i: %s\n", idx, str);
82                 }
83         }
84         mutex_unlock(&strings);
85         if (ok < 0)
86                 snd_iprintf(buf, " NOT ENABLED IN CONFIG\n");
87         return ok;
88 }
89
90 static void snd_sndstat_proc_read(struct snd_info_entry *entry,
91                                   struct snd_info_buffer *buffer)
92 {
93         snd_iprintf(buffer, "Sound Driver:3.8.1a-980706 (ALSA emulation code)\n");
94         snd_iprintf(buffer, "Kernel: %s %s %s %s %s\n",
95                     init_utsname()->sysname,
96                     init_utsname()->nodename,
97                     init_utsname()->release,
98                     init_utsname()->version,
99                     init_utsname()->machine);
100         snd_iprintf(buffer, "Config options: 0\n");
101         snd_iprintf(buffer, "\nInstalled drivers: \n");
102         snd_iprintf(buffer, "Type 10: ALSA emulation\n");
103         snd_iprintf(buffer, "\nCard config: \n");
104         snd_card_info_read_oss(buffer);
105         snd_sndstat_show_strings(buffer, "Audio devices", SNDRV_OSS_INFO_DEV_AUDIO);
106         snd_sndstat_show_strings(buffer, "Synth devices", SNDRV_OSS_INFO_DEV_SYNTH);
107         snd_sndstat_show_strings(buffer, "Midi devices", SNDRV_OSS_INFO_DEV_MIDI);
108         snd_sndstat_show_strings(buffer, "Timers", SNDRV_OSS_INFO_DEV_TIMERS);
109         snd_sndstat_show_strings(buffer, "Mixers", SNDRV_OSS_INFO_DEV_MIXERS);
110 }
111
112 int __init snd_info_minor_register(void)
113 {
114         struct snd_info_entry *entry;
115
116         memset(snd_sndstat_strings, 0, sizeof(snd_sndstat_strings));
117         entry = snd_info_create_module_entry(THIS_MODULE, "sndstat",
118                                              snd_oss_root);
119         if (!entry)
120                 return -ENOMEM;
121         entry->c.text.read = snd_sndstat_proc_read;
122         return snd_info_register(entry); /* freed in error path */
123 }