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