LXR linux/sound/core/info

   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
  21static DEFINE_MUTEX(strings);
  22static char *snd_sndstat_strings[SNDRV_CARDS][SNDRV_OSS_INFO_DEV_COUNT];
  23
  24int 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}
  49EXPORT_SYMBOL(snd_oss_info_register);
  50
  51static 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
  74static 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
  96int __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}
 108