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1// SPDX-License-Identifier: GPL-2.02/*3 * This tool is used by the utimer test, and it allows us to4 * count the ticks of a global timer in a certain time frame5 * (which is set by `timeout` parameter).6 *7 * Author: Ivan Orlov <ivan.orlov0322@gmail.com>8 */9#include <stdio.h>10#include <stdlib.h>11#include <alsa/asoundlib.h>12#include <time.h>13 14static int ticked;15static void async_callback(snd_async_handler_t *ahandler)16{17 ticked++;18}19 20static char timer_name[64];21static void bind_to_timer(int device, int subdevice, int timeout)22{23 snd_timer_t *handle;24 snd_timer_params_t *params;25 snd_async_handler_t *ahandler;26 27 time_t end;28 29 sprintf(timer_name, "hw:CLASS=%d,SCLASS=%d,DEV=%d,SUBDEV=%d",30 SND_TIMER_CLASS_GLOBAL, SND_TIMER_SCLASS_NONE,31 device, subdevice);32 33 snd_timer_params_alloca(¶ms);34 35 if (snd_timer_open(&handle, timer_name, SND_TIMER_OPEN_NONBLOCK) < 0) {36 perror("Can't open the timer");37 exit(EXIT_FAILURE);38 }39 40 snd_timer_params_set_auto_start(params, 1);41 snd_timer_params_set_ticks(params, 1);42 if (snd_timer_params(handle, params) < 0) {43 perror("Can't set timer params");44 exit(EXIT_FAILURE);45 }46 47 if (snd_async_add_timer_handler(&ahandler, handle, async_callback, NULL) < 0) {48 perror("Can't create a handler");49 exit(EXIT_FAILURE);50 }51 end = time(NULL) + timeout;52 if (snd_timer_start(handle) < 0) {53 perror("Failed to start the timer");54 exit(EXIT_FAILURE);55 }56 printf("Timer has started\n");57 while (time(NULL) <= end) {58 /*59 * Waiting for the timeout to elapse. Can't use sleep here, as it gets60 * constantly interrupted by the signal from the timer (SIGIO)61 */62 }63 snd_timer_stop(handle);64 snd_timer_close(handle);65}66 67int main(int argc, char *argv[])68{69 int device, subdevice, timeout;70 71 if (argc < 4) {72 perror("Usage: %s <device> <subdevice> <timeout>");73 return EXIT_FAILURE;74 }75 76 setlinebuf(stdout);77 78 device = atoi(argv[1]);79 subdevice = atoi(argv[2]);80 timeout = atoi(argv[3]);81 82 bind_to_timer(device, subdevice, timeout);83 84 printf("Total ticks count: %d\n", ticked);85 86 return EXIT_SUCCESS;87}88