sound/core/info_oss.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Information interface for ALSA driver
   4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/time.h>
   9 #include <linux/string.h>
  10 #include <linux/export.h>
  11 #include <sound/core.h>
  12 #include <sound/minors.h>
  13 #include <sound/info.h>
  14 #include <linux/utsname.h>
  15 #include <linux/mutex.h>
  16
  17 /*
  18  *  OSS compatible part
  19  */
  20
  21 static DEFINE_MUTEX(strings);
  22 static char *snd_sndstat_strings[SNDRV_CARDS][SNDRV_OSS_INFO_DEV_COUNT];
  23
  24 int snd_oss_info_register(int dev, int num, char *string)
  25 {
  26         char *x;
  27
  28         if (snd_BUG_ON(dev < 0 || dev >= SNDRV_OSS_INFO_DEV_COUNT))
  29                 return -ENXIO;
  30         if (snd_BUG_ON(num < 0 || num >= SNDRV_CARDS))
  31                 return -ENXIO;
  32         guard(mutex)(&strings);
  33         if (string == NULL) {
  34                 x = snd_sndstat_strings[num][dev];
  35                 kfree(x);
  36                 x = NULL;
  37         } else {
  38                 x = kstrdup(string, GFP_KERNEL);
  39                 if (x == NULL)
  40                         return -ENOMEM;
  41         }
  42         snd_sndstat_strings[num][dev] = x;
  43         return 0;
  44 }
  45 EXPORT_SYMBOL(snd_oss_info_register);
  46
  47 static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int dev)
  48 {
  49         int idx, ok = -1;
  50         char *str;
  51
  52         snd_iprintf(buf, "\n%s:", id);
  53         guard(mutex)(&strings);
  54         for (idx = 0; idx < SNDRV_CARDS; idx++) {
  55                 str = snd_sndstat_strings[idx][dev];
  56                 if (str) {
  57                         if (ok < 0) {
  58                                 snd_iprintf(buf, "\n");
  59                                 ok++;
  60                         }
  61                         snd_iprintf(buf, "%i: %s\n", idx, str);
  62                 }
  63         }
  64         if (ok < 0)
  65                 snd_iprintf(buf, " NOT ENABLED IN CONFIG\n");
  66         return ok;
  67 }
  68
  69 static void snd_sndstat_proc_read(struct snd_info_entry *entry,
  70                                   struct snd_info_buffer *buffer)
  71 {
  72         snd_iprintf(buffer, "Sound Driver:3.8.1a-980706 (ALSA emulation code)\n");
  73         snd_iprintf(buffer, "Kernel: %s %s %s %s %s\n",
  74                     init_utsname()->sysname,
  75                     init_utsname()->nodename,
  76                     init_utsname()->release,
  77                     init_utsname()->version,
  78                     init_utsname()->machine);
  79         snd_iprintf(buffer, "Config options: 0\n");
  80         snd_iprintf(buffer, "\nInstalled drivers: \n");
  81         snd_iprintf(buffer, "Type 10: ALSA emulation\n");
  82         snd_iprintf(buffer, "\nCard config: \n");
  83         snd_card_info_read_oss(buffer);
  84         snd_sndstat_show_strings(buffer, "Audio devices", SNDRV_OSS_INFO_DEV_AUDIO);
  85         snd_sndstat_show_strings(buffer, "Synth devices", SNDRV_OSS_INFO_DEV_SYNTH);
  86         snd_sndstat_show_strings(buffer, "Midi devices", SNDRV_OSS_INFO_DEV_MIDI);
  87         snd_sndstat_show_strings(buffer, "Timers", SNDRV_OSS_INFO_DEV_TIMERS);
  88         snd_sndstat_show_strings(buffer, "Mixers", SNDRV_OSS_INFO_DEV_MIXERS);
  89 }
  90
  91 int __init snd_info_minor_register(void)
  92 {
  93         struct snd_info_entry *entry;
  94
  95         memset(snd_sndstat_strings, 0, sizeof(snd_sndstat_strings));
  96         entry = snd_info_create_module_entry(THIS_MODULE, "sndstat",
  97                                              snd_oss_root);
  98         if (!entry)
  99                 return -ENOMEM;
 100         entry->c.text.read = snd_sndstat_proc_read;
 101         return snd_info_register(entry); /* freed in error path */
 102 }