bpf/progs/Huion__Dial-2.bpf.c

1 // SPDX-License-Identifier: GPL-2.0-only
19 /* Filled in by udev-hid-bpf */
34  * To switch the tablet use e.g.  https://github.com/whot/huion-switcher
37  * This BPF works for both modes. The huion-switcher tool sets the
38  * HUION_FIRMWARE_ID udev property - if that is set then we disable the firmware
42  * you bind it to all event nodes
59  * https://github.com/whot/huion-switcher
90  * # 0x55, 0x0d,                    //   Unit Exponent (-3)                46
106  * # 0x15, 0x81,                    //   Logical Minimum (-127)            81
121  * # 0x09, 0x0e,                    // Usage (System Multi-Axis Controller) 2
136  * # 0x09, 0x33,                    //    Usage (Touch)                    32
143  * # 0x16, 0x00, 0x80,              //     Logical Minimum (-32768)        46
215 		// -- Byte 0 in report
221 			// Byte 1 in report - just exists so we get to be a tablet pad
228 			// Bytes 2/3 in report - just exists so we get to be a tablet pad
237 			LogicalRange_i8(-1, 1)
260 		// -- Byte 0 in report
264 			// -- Byte 1 in report
282 				UnitExponent(-1)
298 			LogicalRange_i8(-60, 60)
333 				UnitExponent(-1)
354 			LogicalRange_i8(-60, 60)
380 			// Bytes 2/3 - x/y just exist so we get to be a tablet pad
397 			LogicalRange_i8(-1, 1)
423 	__s32 rdesc_size = hctx->size;  in SEC()
435 				      sizeof(EXPECTED_FIRMWARE_ID) - 1) == 0;  in SEC()
455 	 * the udev property (e.g. huion-switcher run manually)  in SEC()
479 		 *   Button 1: 03 00 05 00 00 00 00 00 -> b  in SEC()
480 		 *   Button 2: 03 00 08 00 00 00 00 00 -> e  in SEC()
481 		 *   Button 3: 03 00 0c 00 00 00 00 00 -> i  in SEC()
482 		 *   Button 4: 03 00 e0 16 00 00 00 00 -> Ctrl S  in SEC()
483 		 *   Button 5: 03 00 2c 00 00 00 00 00 -> space  in SEC()
484 		 *   Button 6: 03 00 e0 e2 1d 00 00 00 -> Ctrl Alt Z  in SEC()
522 		 *   Dial down: 11 00 ff ff 00 00 00 00 00 -> Dial -1  in SEC()
523 		 *   Dial up:   11 00 01 00 00 00 00 00 00 -> Dial 1  in SEC()
576 			pad_report->report_id = PAD_REPORT_ID;  in SEC()
577 			pad_report->btn_stylus = 0;  in SEC()
578 			pad_report->x = 0;  in SEC()
579 			pad_report->y = 0;  in SEC()
580 			pad_report->buttons = last_button_state;  in SEC()
581 			pad_report->dial_1 = dial_1;  in SEC()
582 			pad_report->dial_2 = dial_2;  in SEC()
601 	switch (ctx->rdesc_size) {  in probe()
605 		ctx->retval = 0;  in probe()
608 		ctx->retval = -EINVAL;  in probe()