bpf/progs/Huion__Inspiroy-2-S.bpf.c

1 // SPDX-License-Identifier: GPL-2.0-only
18 /* Filled in by udev-hid-bpf */
33  * To switch the tablet use e.g.  https://github.com/whot/huion-switcher
36  * This BPF works for both modes. The huion-switcher tool sets the
37  * HUION_FIRMWARE_ID udev property - if that is set then we disable the firmware
54  * # 0x81, 0x02,                    //   Input (Data,Var,Abs)                    15
59  * https://github.com/whot/huion-switcher
75  * # 0x09, 0x3c,          //     Usage (Invert)                        18 <-- has no Invert eraser
80  * # 0x81, 0x02,          //     Input (Data,Var,Abs)                  28
81  * # 0x09, 0x32,          //     Usage (In Range)                      30
84  * # 0x81, 0x02,          //     Input (Data,Var,Abs)                  36
85  * # 0x81, 0x03,          //     Input (Cnst,Var,Abs)                  38
89  * # 0x55, 0x0d,          //     Unit Exponent (-3)                    46 <-- change to -2
90  * # 0x65, 0x33,          //     Unit (EnglishLinear: in³)             48 <-- change in³ to in
93  * # 0x46, 0x00, 0x08,    //     Physical Maximum (2048)               55 <-- invalid size
96  * # 0x81, 0x02,          //     Input (Data,Var,Abs)                  62
102  * # 0x81, 0x02,          //     Input (Data,Var,Abs)                  75
103  * # 0x09, 0x3d,          //     Usage (X Tilt)                        77 <-- No tilt reported
105  * # 0x15, 0x81,          //     Logical Minimum (-127)                81
109  * # 0x81, 0x02,          //     Input (Data,Var,Abs)                  89
129  * # 0x81, 0x02,          //   Input (Data,Var,Abs)                    22
136  * # 0x81, 0x00,          //   Input (Data,Arr,Abs)                    37
148  * # 0x81, 0x00,          //   Input (Data,Arr,Abs)                    62
171 		// -- Byte 0 in report
177 			// Byte 1 in report - just exists so we get to be a tablet pad
181 			Input(Var|Abs)
184 			// Bytes 2/3 in report - just exists so we get to be a tablet pad
190 			Input(Var|Abs)
193 			LogicalRange_i8(-1, 1)
203 			Input(Arr|Abs)
214 		// -- Byte 0 in report
218 			// -- Byte 1 in report
225 			Input(Var|Abs)
230 			Input(Var|Abs)
236 				UnitExponent(-1)
240 				Input(Var|Abs) // Bytes 2+3
244 				Input(Var|Abs) // Bytes 4+5
249 			Input(Var|Abs) // Byte 6+7
274 			Input(Var|Abs)
279 			Input(Var|Abs)
285 				UnitExponent(-1)
286 				// Note: reported logical range differs
292 				Input(Var|Abs)
297 				Input(Var|Abs)
302 			Input(Var|Abs)
318 			Input(Var|Abs)
321 			// Bytes 2/3 - x/y just exist so we get to be a tablet pad
327 			Input(Var|Abs)
334 			Input(Var|Abs)
340 			LogicalRange_i8(-1, 1)
362 	__s32 rdesc_size = hctx->size;  in SEC()
374 				      sizeof(EXPECTED_FIRMWARE_ID) - 1) == 0;  in SEC()
394 	 * the udev property (e.g. huion-switcher run manually)  in SEC()
417 		 *   Button 1: 03 00 05 00 00 00 00 00 -> b  in SEC()
418 		 *   Button 2: 03 00 0c 00 00 00 00 00 -> i  in SEC()
419 		 *   Button 3: 03 00 08 00 00 00 00 00 -> e  in SEC()
420 		 *   Button 4: 03 01 16 00 00 00 00 00 -> Ctrl S  in SEC()
421 		 *   Button 5: 03 00 2c 00 00 00 00 00 -> space  in SEC()
422 		 *   Button 6: 03 05 1d 00 00 00 00 00 -> Ctrl Alt Z  in SEC()
424 		 *   Wheel down: 03 01 2d 00 00 00 00 00 -> Ctrl -  in SEC()
425 		 *   Wheel up:   03 01 2e 00 00 00 00 00 -> Ctrl =  in SEC()
452 			wheel = -1;  in SEC()
497 			pad_report->report_id = PAD_REPORT_ID;  in SEC()
498 			pad_report->btn_stylus = 0;  in SEC()
499 			pad_report->x = 0;  in SEC()
500 			pad_report->y = 0;  in SEC()
501 			pad_report->buttons = last_button_state;  in SEC()
502 			pad_report->wheel = wheel;  in SEC()
521 	switch (ctx->rdesc_size) {  in probe()
525 		ctx->retval = 0;  in probe()
528 		ctx->retval = -EINVAL;  in probe()