/* sndprobe.c — 探测 /dev/snd/pcmC0D{p,c}* 的 SNDRV_PCM_IOCTL_INFO（id/name/subs），
 * 定位 R3 Pro II 耳机输出到底在哪个 PCM 设备。静态 mipsel，只读不写参数。 */
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sound/asound.h>

int main(void)
{
    static const char *devs[] = {
        "/dev/snd/pcmC0D0p", "/dev/snd/pcmC0D1p", "/dev/snd/pcmC0D0c", "/dev/snd/pcmC0D1c",
    };
    for (int i = 0; i < 4; i++) {
        int fd = open(devs[i], O_RDWR | O_NONBLOCK);
        if (fd < 0) { printf("%s: open fail\n", devs[i]); continue; }
        struct snd_pcm_info info;
        memset(&info, 0, sizeof info);
        if (ioctl(fd, SNDRV_PCM_IOCTL_INFO, &info) == 0)
            printf("%s: card=%d dev=%d sub=%d id=\"%s\" name=\"%s\" subname=\"%s\" subs=%u/%u\n",
                   devs[i], info.card, info.device, info.subdevice,
                   info.id, info.name, info.subname, info.subdevices_avail, info.subdevices_count);
        else
            printf("%s: INFO ioctl fail\n", devs[i]);
        close(fd);
    }
    /* 控制设备：看卡名 */
    int cf = open("/dev/snd/controlC0", O_RDONLY);
    if (cf >= 0) {
        struct snd_ctl_card_info ci;
        memset(&ci, 0, sizeof ci);
        if (ioctl(cf, SNDRV_CTL_IOCTL_CARD_INFO, &ci) == 0)
            printf("controlC0: id=\"%s\" driver=\"%s\" name=\"%s\" longname=\"%s\"\n",
                   ci.id, ci.driver, ci.name, ci.longname);
        close(cf);
    }
    return 0;
}