T507usb触摸驱动的源码位置:/OKT507-linux-sdk/kernel/linux-4.9/drivers/hid/hid-multitouch.c 报点函数: if (active) { /* this finger is in proximity of the sensor */ int wide = (s->w > s->h); /* divided by two to match visual scale of touch */ int major = max(s->w, s->h) >> 1; int minor = min(s->w, s->h) >> 1; input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x); input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y); input_event(input, EV_ABS, ABS_MT_TOOL_X, s->cx); input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy); input_event(input, EV_ABS, ABS_MT_DISTANCE, !s->touch_state); input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide); input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p); input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major); input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor); } 触摸驱动的主要作用就是采点 报点,通过修改触摸驱动的报点函数也可以修正一些触摸偏移。 例如,报点位置和实际触摸位置不一致,y轴坐标偏移了两倍,可以在报点时把y轴坐标值除以2: input_event(input, EV_ABS, ABS_MT_POSITION_Y, (s->y)/2); input_event(input, EV_ABS, ABS_MT_TOOL_Y, (s->cy)/2); 例如,想在驱动层翻转一下X轴,可在X坐标前减去水平分辨率: input_event(input, EV_ABS, ABS_MT_POSITION_X, 1920-s->x); |
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