kernel/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 }