path: root/tools/testing/selftests/alsa/mixer-test.c

// SPDX-License-Identifier: GPL-2.0
//
// kselftest for the ALSA mixer API
//
// Original author: Mark Brown <broonie@kernel.org>
// Copyright (c) 2021-2 Arm Limited

// This test will iterate over all cards detected in the system, exercising
// every mixer control it can find.  This may conflict with other system
// software if there is audio activity so is best run on a system with a
// minimal active userspace.

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <limits.h>
#include <string.h>
#include <getopt.h>
#include <stdarg.h>
#include <ctype.h>
#include <math.h>
#include <errno.h>
#include <assert.h>
#include <alsa/asoundlib.h>
#include <poll.h>
#include <stdint.h>

#include "../kselftest.h"
#include "alsa-local.h"

#define TESTS_PER_CONTROL 7

struct card_data {
	snd_ctl_t *handle;
	int card;
	snd_ctl_card_info_t *info;
	const char *card_name;
	struct pollfd pollfd;
	int num_ctls;
	snd_ctl_elem_list_t *ctls;
	struct card_data *next;
};

struct ctl_data {
	const char *name;
	snd_ctl_elem_id_t *id;
	snd_ctl_elem_info_t *info;
	snd_ctl_elem_value_t *def_val;
	int elem;
	int event_missing;
	int event_spurious;
	struct card_data *card;
	struct ctl_data *next;
};

int num_cards = 0;
int num_controls = 0;
struct card_data *card_list = NULL;
struct ctl_data *ctl_list = NULL;

static void find_controls(void)
{
	char name[32];
	int card, ctl, err;
	struct card_data *card_data;
	struct ctl_data *ctl_data;
	snd_config_t *config;
	char *card_name, *card_longname;

	card = -1;
	if (snd_card_next(&card) < 0 || card < 0)
		return;

	config = get_alsalib_config();

	while (card >= 0) {
		sprintf(name, "hw:%d", card);

		card_data = malloc(sizeof(*card_data));
		if (!card_data)
			ksft_exit_fail_msg("Out of memory\n");

		err = snd_ctl_open_lconf(&card_data->handle, name, 0, config);
		if (err < 0) {
			ksft_print_msg("Failed to get hctl for card %d: %s\n",
				       card, snd_strerror(err));
			goto next_card;
		}

		err = snd_card_get_name(card, &card_name);
		if (err != 0)
			card_name = "Unknown";
		err = snd_card_get_longname(card, &card_longname);
		if (err != 0)
			card_longname = "Unknown";

		err = snd_ctl_card_info_malloc(&card_data->info);
		if (err != 0)
			ksft_exit_fail_msg("Failed to allocate card info: %d\n",
				err);

		err = snd_ctl_card_info(card_data->handle, card_data->info);
		if (err == 0) {
			card_data->card_name = snd_ctl_card_info_get_id(card_data->info);
			if (!card_data->card_name)
				ksft_print_msg("Failed to get card ID\n");
		} else {
			ksft_print_msg("Failed to get card info: %d\n", err);
		}

		if (!card_data->card_name)
			card_data->card_name = "Unknown";

		ksft_print_msg("Card %d/%s - %s (%s)\n", card,
			       card_data->card_name, card_name, card_longname);

		/* Count controls */
		snd_ctl_elem_list_malloc(&card_data->ctls);
		snd_ctl_elem_list(card_data->handle, card_data->ctls);
		card_data->num_ctls = snd_ctl_elem_list_get_count(card_data->ctls);

		/* Enumerate control information */
		snd_ctl_elem_list_alloc_space(card_data->ctls, card_data->num_ctls);
		snd_ctl_elem_list(card_data->handle, card_data->ctls);

		card_data->card = num_cards++;
		card_data->next = card_list;
		card_list = card_data;

		num_controls += card_data->num_ctls;

		for (ctl = 0; ctl < card_data->num_ctls; ctl++) {
			ctl_data = malloc(sizeof(*ctl_data));
			if (!ctl_data)
				ksft_exit_fail_msg("Out of memory\n");

			memset(ctl_data, 0, sizeof(*ctl_data));
			ctl_data->card = card_data;
			ctl_data->elem = ctl;
			ctl_data->name = snd_ctl_elem_list_get_name(card_data->ctls,
								    ctl);

			err