root/sound/core/info_oss.c

DEFINITIONS

1. snd_oss_info_register
2. snd_sndstat_show_strings
3. snd_sndstat_proc_read
4. snd_info_minor_register

   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                 if ((x = snd_sndstat_strings[num][dev]) != NULL) {
  35                         kfree(x);
  36                         x = NULL;
  37                 }
  38         } else {
  39                 x = kstrdup(string, GFP_KERNEL);
  40                 if (x == NULL) {
  41                         mutex_unlock(&strings);
  42                         return -ENOMEM;
  43                 }
  44         }
  45         snd_sndstat_strings[num][dev] = x;
  46         mutex_unlock(&strings);
  47         return 0;
  48 }
  49 EXPORT_SYMBOL(snd_oss_info_register);
  50 
  51 static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int dev)
  52 {
  53         int idx, ok = -1;
  54         char *str;
  55 
  56         snd_iprintf(buf, "\n%s:", id);
  57         mutex_lock(&strings);
  58         for (idx = 0; idx < SNDRV_CARDS; idx++) {
  59                 str = snd_sndstat_strings[idx][dev];
  60                 if (str) {
  61                         if (ok < 0) {
  62                                 snd_iprintf(buf, "\n");
  63                                 ok++;
  64                         }
  65                         snd_iprintf(buf, "%i: %s\n", idx, str);
  66                 }
  67         }
  68         mutex_unlock(&strings);
  69         if (ok < 0)
  70                 snd_iprintf(buf, " NOT ENABLED IN CONFIG\n");
  71         return ok;
  72 }
  73 
  74 static void snd_sndstat_proc_read(struct snd_info_entry *entry,
  75                                   struct snd_info_buffer *buffer)
  76 {
  77         snd_iprintf(buffer, "Sound Driver:3.8.1a-980706 (ALSA emulation code)\n");
  78         snd_iprintf(buffer, "Kernel: %s %s %s %s %s\n",
  79                     init_utsname()->sysname,
  80                     init_utsname()->nodename,
  81                     init_utsname()->release,
  82                     init_utsname()->version,
  83                     init_utsname()->machine);
  84         snd_iprintf(buffer, "Config options: 0\n");
  85         snd_iprintf(buffer, "\nInstalled drivers: \n");
  86         snd_iprintf(buffer, "Type 10: ALSA emulation\n");
  87         snd_iprintf(buffer, "\nCard config: \n");
  88         snd_card_info_read_oss(buffer);
  89         snd_sndstat_show_strings(buffer, "Audio devices", SNDRV_OSS_INFO_DEV_AUDIO);
  90         snd_sndstat_show_strings(buffer, "Synth devices", SNDRV_OSS_INFO_DEV_SYNTH);
  91         snd_sndstat_show_strings(buffer, "Midi devices", SNDRV_OSS_INFO_DEV_MIDI);
  92         snd_sndstat_show_strings(buffer, "Timers", SNDRV_OSS_INFO_DEV_TIMERS);
  93         snd_sndstat_show_strings(buffer, "Mixers", SNDRV_OSS_INFO_DEV_MIXERS);
  94 }
  95 
  96 int __init snd_info_minor_register(void)
  97 {
  98         struct snd_info_entry *entry;
  99 
 100         memset(snd_sndstat_strings, 0, sizeof(snd_sndstat_strings));
 101         entry = snd_info_create_module_entry(THIS_MODULE, "sndstat",
 102                                              snd_oss_root);
 103         if (!entry)
 104                 return -ENOMEM;
 105         entry->c.text.read = snd_sndstat_proc_read;
 106         return snd_info_register(entry); /* freed in error path */
 107 }