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         mutex_lock(&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                         mutex_unlock(&strings);
  41                         return -ENOMEM;
  42                 }
  43         }
  44         snd_sndstat_strings[num][dev] = x;
  45         mutex_unlock(&strings);
  46         return 0;
  47 }
  48 EXPORT_SYMBOL(snd_oss_info_register);
  49
  50 static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int dev)
  51 {
  52         int idx, ok = -1;
  53         char *str;
  54
  55         snd_iprintf(buf, "\n%s:", id);
  56         mutex_lock(&strings);
  57         for (idx = 0; idx < SNDRV_CARDS; idx++) {
  58                 str = snd_sndstat_strings[idx][dev];
  59                 if (str) {
  60                         if (ok < 0) {
  61                                 snd_iprintf(buf, "\n");
  62                                 ok++;
  63                         }
  64                         snd_iprintf(buf, "%i: %s\n", idx, str);
  65                 }
  66         }
  67         mutex_unlock(&strings);
  68         if (ok < 0)
  69                 snd_iprintf(buf, " NOT ENABLED IN CONFIG\n");
  70         return ok;
  71 }
  72
  73 static void snd_sndstat_proc_read(struct snd_info_entry *entry,
  74                                   struct snd_info_buffer *buffer)
  75 {
  76         snd_iprintf(buffer, "Sound Driver:3.8.1a-980706 (ALSA emulation code)\n");
  77         snd_iprintf(buffer, "Kernel: %s %s %s %s %s\n",
  78                     init_utsname()->sysname,
  79                     init_utsname()->nodename,
  80                     init_utsname()->release,
  81                     init_utsname()->version,
  82                     init_utsname()->machine);
  83         snd_iprintf(buffer, "Config options: 0\n");
  84         snd_iprintf(buffer, "\nInstalled drivers: \n");
  85         snd_iprintf(buffer, "Type 10: ALSA emulation\n");
  86         snd_iprintf(buffer, "\nCard config: \n");
  87         snd_card_info_read_oss(buffer);
  88         snd_sndstat_show_strings(buffer, "Audio devices", SNDRV_OSS_INFO_DEV_AUDIO);
  89         snd_sndstat_show_strings(buffer, "Synth devices", SNDRV_OSS_INFO_DEV_SYNTH);
  90         snd_sndstat_show_strings(buffer, "Midi devices", SNDRV_OSS_INFO_DEV_MIDI);
  91         snd_sndstat_show_strings(buffer, "Timers", SNDRV_OSS_INFO_DEV_TIMERS);
  92         snd_sndstat_show_strings(buffer, "Mixers", SNDRV_OSS_INFO_DEV_MIXERS);
  93 }
  94
  95 int __init snd_info_minor_register(void)
  96 {
  97         struct snd_info_entry *entry;
  98
  99         memset(snd_sndstat_strings, 0, sizeof(snd_sndstat_strings));
 100         entry = snd_info_create_module_entry(THIS_MODULE, "sndstat",
 101                                              snd_oss_root);
 102         if (!entry)
 103                 return -ENOMEM;
 104         entry->c.text.read = snd_sndstat_proc_read;
 105         return snd_info_register(entry); /* freed in error path */
 106 }