/* probe_input.c — 读 goodix-ts 触摸 ABS 范围 + fb0 分辨率。
 * 用于确认「歌单列表触摸坐标有偏差/串行」是否由触摸面板分辨率与帧缓冲不一致引起。
 * 本地设备操作，零 NCM 请求。 */
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <linux/input.h>
#include <linux/fb.h>
#include <sys/ioctl.h>

static const char *axis_name(int code)
{
    switch (code) {
        case ABS_X: return "ABS_X";
        case ABS_Y: return "ABS_Y";
        case ABS_MT_POSITION_X: return "ABS_MT_POSITION_X";
        case ABS_MT_POSITION_Y: return "ABS_MT_POSITION_Y";
        default: return "?";
    }
}

int main(void)
{
    int fd = open("/dev/input/event1", O_RDONLY | O_NONBLOCK);
    if (fd < 0) { printf("open event1 failed: %s\n", strerror(errno)); return 1; }
    int codes[] = { ABS_X, ABS_Y, ABS_MT_POSITION_X, ABS_MT_POSITION_Y };
    for (unsigned i = 0; i < sizeof codes / sizeof codes[0]; i++) {
        struct input_absinfo ab; memset(&ab, 0, sizeof ab);
        if (ioctl(fd, EVIOCGABS(codes[i]), &ab) == 0)
            printf("%-22s min=%d max=%d value=%d flat=%d fuzz=%d res=%d\n",
                   axis_name(codes[i]), ab.minimum, ab.maximum, ab.value,
                   ab.flat, ab.fuzz, ab.resolution);
        else
            printf("%-22s ioctl failed: %s\n", axis_name(codes[i]), strerror(errno));
    }
    close(fd);

    /* fb0 分辨率 */
    fd = open("/dev/fb0", O_RDWR);
    if (fd >= 0) {
        struct fb_var_screeninfo vs; memset(&vs, 0, sizeof vs);
        if (ioctl(fd, FBIOGET_VSCREENINFO, &vs) == 0)
            printf("fb0 xres=%u yres=%u xres_virtual=%u yres_virtual=%u bpp=%u\n",
                   vs.xres, vs.yres, vs.xres_virtual, vs.yres_virtual, vs.bits_per_pixel);
        else printf("fb0 vinfo failed: %s\n", strerror(errno));
        close(fd);
    } else printf("open fb0 failed: %s\n", strerror(errno));
    return 0;
}