// SPDX-License-Identifier: GPL-2.0
/*
 * This tool is used by the utimer test, and it allows us to
 * count the ticks of a global timer in a certain time frame
 * (which is set by `timeout` parameter).
 *
 * Author: Ivan Orlov <ivan.orlov0322@gmail.com>
 */
#include <stdio.h>
#include <stdlib.h>
#include <alsa/asoundlib.h>
#include <time.h>

static int ticked;
static void async_callback(snd_async_handler_t *ahandler)
{
        ticked++;
}

static char timer_name[64];
static void bind_to_timer(int device, int subdevice, int timeout)
{
        snd_timer_t *handle;
        snd_timer_params_t *params;
        snd_async_handler_t *ahandler;

        time_t end;

        sprintf(timer_name, "hw:CLASS=%d,SCLASS=%d,DEV=%d,SUBDEV=%d",
                SND_TIMER_CLASS_GLOBAL, SND_TIMER_SCLASS_NONE,
                device, subdevice);

        snd_timer_params_alloca(&params);

        if (snd_timer_open(&handle, timer_name, SND_TIMER_OPEN_NONBLOCK) < 0) {
                perror("Can't open the timer");
                exit(EXIT_FAILURE);
        }

        snd_timer_params_set_auto_start(params, 1);
        snd_timer_params_set_ticks(params, 1);
        if (snd_timer_params(handle, params) < 0) {
                perror("Can't set timer params");
                exit(EXIT_FAILURE);
        }

        if (snd_async_add_timer_handler(&ahandler, handle, async_callback, NULL) < 0) {
                perror("Can't create a handler");
                exit(EXIT_FAILURE);
        }
        end = time(NULL) + timeout;
        if (snd_timer_start(handle) < 0) {
                perror("Failed to start the timer");
                exit(EXIT_FAILURE);
        }
        printf("Timer has started\n");
        while (time(NULL) <= end) {
                /*
                 * Waiting for the timeout to elapse. Can't use sleep here, as it gets
                 * constantly interrupted by the signal from the timer (SIGIO)
                 */
        }
        snd_timer_stop(handle);
        snd_timer_close(handle);
}

int main(int argc, char *argv[])
{
        int device, subdevice, timeout;

        if (argc < 4) {
                perror("Usage: %s <device> <subdevice> <timeout>");
                return EXIT_FAILURE;
        }

        setlinebuf(stdout);

        device = atoi(argv[1]);
        subdevice = atoi(argv[2]);
        timeout = atoi(argv[3]);

        bind_to_timer(device, subdevice, timeout);

        printf("Total ticks count: %d\n", ticked);

        return EXIT_SUCCESS;
}