bpf/progs/Wacom__ArtPen.bpf.c

21  *   reports pressure every other events.
23  *   the current one, we can emulate a smoother pressure reporting by reporting
26  * We are effectively delaying the pressure by one event every other event, but
30  * <Tip switch 0> <X 0> <Y 0> <Pressure    0 > <Tooltype 0x0804>
31  * <Tip switch 1> <X 1> <Y 1> <Pressure  100 > <Tooltype 0x0804>
32  * <Tip switch 1> <X 2> <Y 2> <Pressure  100 > <Tooltype 0x0804>
33  * <Tip switch 1> <X 3> <Y 3> <Pressure  200 > <Tooltype 0x0804>
34  * <Tip switch 1> <X 4> <Y 4> <Pressure  200 > <Tooltype 0x0804>
35  * <Tip switch 0> <X 5> <Y 5> <Pressure    0 > <Tooltype 0x0804>
38  * <Tip switch 0> <X 0> <Y 0> <Pressure    0 > <Tooltype 0x0804>
39  * <Tip switch 1> <X 1> <Y 1> <Pressure * 50*> <Tooltype 0x0804>
40  * <Tip switch 1> <X 2> <Y 2> <Pressure  100 > <Tooltype 0x0804>
41  * <Tip switch 1> <X 3> <Y 3> <Pressure *150*> <Tooltype 0x0804>
42  * <Tip switch 1> <X 4> <Y 4> <Pressure  200 > <Tooltype 0x0804>
43  * <Tip switch 0> <X 5> <Y 5> <Pressure    0 > <Tooltype 0x0804>
54 		__u8 pressure;  member
71 			.pressure = 8,
108 	__u16 *pressure, *tool_type;  in SEC()  local
116 	    params.offsets.pressure >= PEN_REPORT_LEN - 1 ||  in SEC()
131 	pressure = get_u16(data, params.offsets.pressure);  in SEC()
134 		*pressure = (*pressure + prev_pressure) / 2;  in SEC()
136 	prev_pressure = *pressure;  in SEC()