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
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
112 …15 00 25 01 7501 95 06 81 02 09 32 75 01 95 01 81 02 81 03 05 01 09 30 09 31 55 0d 65 33 26 ff7f 3…
129  * # 0x81, 0x02,          //   Input (Data,Var,Abs)                    22
136  * # 0x81, 0x00,          //   Input (Data,Arr,Abs)                    37
148  * # 0x81, 0x00,          //   Input (Data,Arr,Abs)                    62
150 …05 07 19 e0 29 e7 15 00 25 01 75 01 95 08 81 02 0507 19 00 29 ff 26 ff 00 75 08 95 06 81 00 c0 05 …
171 		// -- Byte 0 in report
177 			// Byte 1 in report - just exists so we get to be a tablet pad
181 			Input(Var|Abs)
183 			Input(Const)
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)
196 			Input(Var|Rel)
203 			Input(Arr|Abs)
214 		// -- Byte 0 in report
218 			// -- Byte 1 in report
225 			Input(Var|Abs)
227 			Input(Const)
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
253 			Input(Const) // Byte 6+7
274 			Input(Var|Abs)
276 			Input(Const)
279 			Input(Var|Abs)
285 				UnitExponent(-1)
292 				Input(Var|Abs)
297 				Input(Var|Abs)
302 			Input(Var|Abs)
318 			Input(Var|Abs)
320 			Input(Const)
321 			// Bytes 2/3 - x/y just exist so we get to be a tablet pad
327 			Input(Var|Abs)
334 			Input(Var|Abs)
336 			Input(Const)
340 			LogicalRange_i8(-1, 1)
343 			Input(Var|Rel)
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()