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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 *  Information interface for ALSA driver4 *  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 part19 */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