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Linux/sound/core/info_oss.c

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  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 }
108 

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