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