sound/core/info_oss.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  Information interface for ALSA driver
0004  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
0005  */
0006
0007 #include <linux/slab.h>
0008 #include <linux/time.h>
0009 #include <linux/string.h>
0010 #include <linux/export.h>
0011 #include <sound/core.h>
0012 #include <sound/minors.h>
0013 #include <sound/info.h>
0014 #include <linux/utsname.h>
0015 #include <linux/mutex.h>
0016
0017 /*
0018  *  OSS compatible part
0019  */
0020
0021 static DEFINE_MUTEX(strings);
0022 static char *snd_sndstat_strings[SNDRV_CARDS][SNDRV_OSS_INFO_DEV_COUNT];
0023
0024 int snd_oss_info_register(int dev, int num, char *string)
0025 {
0026     char *x;
0027
0028     if (snd_BUG_ON(dev < 0 || dev >= SNDRV_OSS_INFO_DEV_COUNT))
0029         return -ENXIO;
0030     if (snd_BUG_ON(num < 0 || num >= SNDRV_CARDS))
0031         return -ENXIO;
0032     mutex_lock(&strings);
0033     if (string == NULL) {
0034         x = snd_sndstat_strings[num][dev];
0035         kfree(x);
0036         x = NULL;
0037     } else {
0038         x = kstrdup(string, GFP_KERNEL);
0039         if (x == NULL) {
0040             mutex_unlock(&strings);
0041             return -ENOMEM;
0042         }
0043     }
0044     snd_sndstat_strings[num][dev] = x;
0045     mutex_unlock(&strings);
0046     return 0;
0047 }
0048 EXPORT_SYMBOL(snd_oss_info_register);
0049
0050 static int snd_sndstat_show_strings(struct snd_info_buffer *buf, char *id, int dev)
0051 {
0052     int idx, ok = -1;
0053     char *str;
0054
0055     snd_iprintf(buf, "\n%s:", id);
0056     mutex_lock(&strings);
0057     for (idx = 0; idx < SNDRV_CARDS; idx++) {
0058         str = snd_sndstat_strings[idx][dev];
0059         if (str) {
0060             if (ok < 0) {
0061                 snd_iprintf(buf, "\n");
0062                 ok++;
0063             }
0064             snd_iprintf(buf, "%i: %s\n", idx, str);
0065         }
0066     }
0067     mutex_unlock(&strings);
0068     if (ok < 0)
0069         snd_iprintf(buf, " NOT ENABLED IN CONFIG\n");
0070     return ok;
0071 }
0072
0073 static void snd_sndstat_proc_read(struct snd_info_entry *entry,
0074                   struct snd_info_buffer *buffer)
0075 {
0076     snd_iprintf(buffer, "Sound Driver:3.8.1a-980706 (ALSA emulation code)\n");
0077     snd_iprintf(buffer, "Kernel: %s %s %s %s %s\n",
0078             init_utsname()->sysname,
0079             init_utsname()->nodename,
0080             init_utsname()->release,
0081             init_utsname()->version,
0082             init_utsname()->machine);
0083     snd_iprintf(buffer, "Config options: 0\n");
0084     snd_iprintf(buffer, "\nInstalled drivers: \n");
0085     snd_iprintf(buffer, "Type 10: ALSA emulation\n");
0086     snd_iprintf(buffer, "\nCard config: \n");
0087     snd_card_info_read_oss(buffer);
0088     snd_sndstat_show_strings(buffer, "Audio devices", SNDRV_OSS_INFO_DEV_AUDIO);
0089     snd_sndstat_show_strings(buffer, "Synth devices", SNDRV_OSS_INFO_DEV_SYNTH);
0090     snd_sndstat_show_strings(buffer, "Midi devices", SNDRV_OSS_INFO_DEV_MIDI);
0091     snd_sndstat_show_strings(buffer, "Timers", SNDRV_OSS_INFO_DEV_TIMERS);
0092     snd_sndstat_show_strings(buffer, "Mixers", SNDRV_OSS_INFO_DEV_MIXERS);
0093 }
0094
0095 int __init snd_info_minor_register(void)
0096 {
0097     struct snd_info_entry *entry;
0098
0099     memset(snd_sndstat_strings, 0, sizeof(snd_sndstat_strings));
0100     entry = snd_info_create_module_entry(THIS_MODULE, "sndstat",
0101                          snd_oss_root);
0102     if (!entry)
0103         return -ENOMEM;
0104     entry->c.text.read = snd_sndstat_proc_read;
0105     return snd_info_register(entry); /* freed in error path */
0106 }