1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * This tool is used by the utimer test, and it allows us to 4 * count the ticks of a global timer in a certain time frame 5 * (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 14 static int ticked; 15 static void async_callback(snd_async_handler_t *ahandler) 16 { 17 ticked++; 18 } 19 20 static char timer_name[64]; 21 static 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 gets 60 * constantly interrupted by the signal from the timer (SIGIO) 61 */ 62 } 63 snd_timer_stop(handle); 64 snd_timer_close(handle); 65 } 66 67 int 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