HID: bpf: add a driver for the Huion Inspiroy 2S (H641P)

+534

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drivers

hid

bpf

progs

Huion__Inspiroy-2-S.bpf.c

+534

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

··· 1 + // SPDX-License-Identifier: GPL-2.0-only 2 + /* Copyright (c) 2024 Red Hat, Inc 3 + */ 4 + 5 + #include "vmlinux.h" 6 + #include "hid_bpf.h" 7 + #include "hid_bpf_helpers.h" 8 + #include "hid_report_helpers.h" 9 + #include <bpf/bpf_tracing.h> 10 + 11 + #define VID_HUION 0x256C 12 + #define PID_INSPIROY_2_S 0x0066 13 + 14 + HID_BPF_CONFIG( 15 + HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_HUION, PID_INSPIROY_2_S), 16 + ); 17 + 18 + /* Filled in by udev-hid-bpf */ 19 + char UDEV_PROP_HUION_FIRMWARE_ID[64]; 20 + 21 + /* The prefix of the firmware ID we expect for this device. The full firmware 22 + * string has a date suffix, e.g. HUION_T21j_221221 23 + */ 24 + char EXPECTED_FIRMWARE_ID[] = "HUION_T21j_"; 25 + 26 + /* How this BPF program works: the tablet has two modes, firmware mode and 27 + * tablet mode. In firmware mode (out of the box) the tablet sends button events 28 + * and the dial as keyboard combinations. In tablet mode it uses a vendor specific 29 + * hid report to report everything instead. 30 + * Depending on the mode some hid reports are never sent and the corresponding 31 + * devices are mute. 32 + * 33 + * To switch the tablet use e.g. https://github.com/whot/huion-switcher 34 + * or one of the tools from the digimend project 35 + * 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 38 + * pad and pen reports (by making them vendor collections that are ignored). 39 + * If that property is not set we fix all hidraw nodes so the tablet works in 40 + * either mode though the drawback is that the device will show up twice if 41 + * you bind it to all event nodes 42 + * 43 + * Default report descriptor for the first exposed hidraw node: 44 + * 45 + * # HUION Huion Tablet_H641P 46 + * # Report descriptor length: 18 bytes 47 + * # 0x06, 0x00, 0xff, // Usage Page (Vendor Defined Page 0xFF00) 0 48 + * # 0x09, 0x01, // Usage (Vendor Usage 0x01) 3 49 + * # 0xa1, 0x01, // Collection (Application) 5 50 + * # 0x85, 0x08, // Report ID (8) 7 51 + * # 0x75, 0x58, // Report Size (88) 9 52 + * # 0x95, 0x01, // Report Count (1) 11 53 + * # 0x09, 0x01, // Usage (Vendor Usage 0x01) 13 54 + * # 0x81, 0x02, // Input (Data,Var,Abs) 15 55 + * # 0xc0, // End Collection 17 56 + * R: 18 06 00 ff 09 01 a1 01 85 08 75 58 95 01 09 01 81 02 c0 57 + * 58 + * This rdesc does nothing until the tablet is switched to raw mode, see 59 + * https://github.com/whot/huion-switcher 60 + * 61 + * 62 + * Second hidraw node is the Pen. This one sends events until the tablet is 63 + * switched to raw mode, then it's mute. 64 + * 65 + * # Report descriptor length: 93 bytes 66 + * # 0x05, 0x0d, // Usage Page (Digitizers) 0 67 + * # 0x09, 0x02, // Usage (Pen) 2 68 + * # 0xa1, 0x01, // Collection (Application) 4 69 + * # 0x85, 0x0a, // Report ID (10) 6 70 + * # 0x09, 0x20, // Usage (Stylus) 8 71 + * # 0xa1, 0x01, // Collection (Application) 10 72 + * # 0x09, 0x42, // Usage (Tip Switch) 12 73 + * # 0x09, 0x44, // Usage (Barrel Switch) 14 74 + * # 0x09, 0x45, // Usage (Eraser) 16 75 + * # 0x09, 0x3c, // Usage (Invert) 18 <-- has no Invert eraser 76 + * # 0x15, 0x00, // Logical Minimum (0) 20 77 + * # 0x25, 0x01, // Logical Maximum (1) 22 78 + * # 0x75, 0x01, // Report Size (1) 24 79 + * # 0x95, 0x06, // Report Count (6) 26 80 + * # 0x81, 0x02, // Input (Data,Var,Abs) 28 81 + * # 0x09, 0x32, // Usage (In Range) 30 82 + * # 0x75, 0x01, // Report Size (1) 32 83 + * # 0x95, 0x01, // Report Count (1) 34 84 + * # 0x81, 0x02, // Input (Data,Var,Abs) 36 85 + * # 0x81, 0x03, // Input (Cnst,Var,Abs) 38 86 + * # 0x05, 0x01, // Usage Page (Generic Desktop) 40 87 + * # 0x09, 0x30, // Usage (X) 42 88 + * # 0x09, 0x31, // Usage (Y) 44 89 + * # 0x55, 0x0d, // Unit Exponent (-3) 46 <-- change to -2 90 + * # 0x65, 0x33, // Unit (EnglishLinear: in³) 48 <-- change in³ to in 91 + * # 0x26, 0xff, 0x7f, // Logical Maximum (32767) 50 92 + * # 0x35, 0x00, // Physical Minimum (0) 53 93 + * # 0x46, 0x00, 0x08, // Physical Maximum (2048) 55 <-- invalid size 94 + * # 0x75, 0x10, // Report Size (16) 58 95 + * # 0x95, 0x02, // Report Count (2) 60 96 + * # 0x81, 0x02, // Input (Data,Var,Abs) 62 97 + * # 0x05, 0x0d, // Usage Page (Digitizers) 64 98 + * # 0x09, 0x30, // Usage (Tip Pressure) 66 99 + * # 0x26, 0xff, 0x1f, // Logical Maximum (8191) 68 100 + * # 0x75, 0x10, // Report Size (16) 71 101 + * # 0x95, 0x01, // Report Count (1) 73 102 + * # 0x81, 0x02, // Input (Data,Var,Abs) 75 103 + * # 0x09, 0x3d, // Usage (X Tilt) 77 <-- No tilt reported 104 + * # 0x09, 0x3e, // Usage (Y Tilt) 79 105 + * # 0x15, 0x81, // Logical Minimum (-127) 81 106 + * # 0x25, 0x7f, // Logical Maximum (127) 83 107 + * # 0x75, 0x08, // Report Size (8) 85 108 + * # 0x95, 0x02, // Report Count (2) 87 109 + * # 0x81, 0x02, // Input (Data,Var,Abs) 89 110 + * # 0xc0, // End Collection 91 111 + * # 0xc0, // End Collection 92 112 + * R: 93 05 0d 09 02 a1 01 85 0a 09 20 a1 01 09 42 09 44 09 45 09 3c 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 35 00 46 00 08 75 10 95 02 81 02 05 0d 09 30 26 ff 1f 75 10 95 01 81 02 09 3d09 3e 15 81 25 7f 75 08 95 02 81 02 c0 c0 113 + * 114 + * Third hidraw node is the pad which sends a combination of keyboard shortcuts until 115 + * the tablet is switched to raw mode, then it's mute: 116 + * 117 + * # Report descriptor length: 65 bytes 118 + * # 0x05, 0x01, // Usage Page (Generic Desktop) 0 119 + * # 0x09, 0x06, // Usage (Keyboard) 2 120 + * # 0xa1, 0x01, // Collection (Application) 4 121 + * # 0x85, 0x03, // Report ID (3) 6 122 + * # 0x05, 0x07, // Usage Page (Keyboard/Keypad) 8 123 + * # 0x19, 0xe0, // UsageMinimum (224) 10 124 + * # 0x29, 0xe7, // UsageMaximum (231) 12 125 + * # 0x15, 0x00, // Logical Minimum (0) 14 126 + * # 0x25, 0x01, // Logical Maximum (1) 16 127 + * # 0x75, 0x01, // Report Size (1) 18 128 + * # 0x95, 0x08, // Report Count (8) 20 129 + * # 0x81, 0x02, // Input (Data,Var,Abs) 22 130 + * # 0x05, 0x07, // Usage Page (Keyboard/Keypad) 24 131 + * # 0x19, 0x00, // UsageMinimum (0) 26 132 + * # 0x29, 0xff, // UsageMaximum (255) 28 133 + * # 0x26, 0xff, 0x00, // Logical Maximum (255) 30 134 + * # 0x75, 0x08, // Report Size (8) 33 135 + * # 0x95, 0x06, // Report Count (6) 35 136 + * # 0x81, 0x00, // Input (Data,Arr,Abs) 37 137 + * # 0xc0, // End Collection 39 138 + * # 0x05, 0x0c, // Usage Page (Consumer) 40 139 + * # 0x09, 0x01, // Usage (Consumer Control) 42 140 + * # 0xa1, 0x01, // Collection (Application) 44 141 + * # 0x85, 0x04, // Report ID (4) 46 142 + * # 0x19, 0x00, // UsageMinimum (0) 48 143 + * # 0x2a, 0x3c, 0x02, // UsageMaximum (572) 50 144 + * # 0x15, 0x00, // Logical Minimum (0) 53 145 + * # 0x26, 0x3c, 0x02, // Logical Maximum (572) 55 146 + * # 0x95, 0x01, // Report Count (1) 58 147 + * # 0x75, 0x10, // Report Size (16) 60 148 + * # 0x81, 0x00, // Input (Data,Arr,Abs) 62 149 + * # 0xc0, // End Collection 64 150 + * R: 65 05 01 09 06 a1 01 85 03 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 0c 09 01 a1 01 85 04 19 00 2a 3c02 15 00 26 3c 02 95 01 75 10 81 00 c0 151 + * N: HUION Huion Tablet_H641P 152 + */ 153 + 154 + #define PAD_REPORT_DESCRIPTOR_LENGTH 65 155 + #define PEN_REPORT_DESCRIPTOR_LENGTH 93 156 + #define VENDOR_REPORT_DESCRIPTOR_LENGTH 18 157 + #define PAD_REPORT_ID 3 158 + #define PEN_REPORT_ID 10 159 + #define VENDOR_REPORT_ID 8 160 + #define PAD_REPORT_LENGTH 8 161 + #define PEN_REPORT_LENGTH 10 162 + #define VENDOR_REPORT_LENGTH 12 163 + 164 + 165 + __u8 last_button_state; 166 + 167 + static const __u8 fixed_rdesc_pad[] = { 168 + UsagePage_GenericDesktop 169 + Usage_GD_Keypad 170 + CollectionApplication( 171 + // -- Byte 0 in report 172 + ReportId(PAD_REPORT_ID) 173 + LogicalRange_i8(0, 1) 174 + UsagePage_Digitizers 175 + Usage_Dig_TabletFunctionKeys 176 + CollectionPhysical( 177 + // Byte 1 in report - just exists so we get to be a tablet pad 178 + Usage_Dig_BarrelSwitch // BTN_STYLUS 179 + ReportCount(1) 180 + ReportSize(1) 181 + Input(Var|Abs) 182 + ReportCount(7) // padding 183 + Input(Const) 184 + // Bytes 2/3 in report - just exists so we get to be a tablet pad 185 + UsagePage_GenericDesktop 186 + Usage_GD_X 187 + Usage_GD_Y 188 + ReportCount(2) 189 + ReportSize(8) 190 + Input(Var|Abs) 191 + // Byte 4 in report is the wheel 192 + Usage_GD_Wheel 193 + LogicalRange_i8(-1, 1) 194 + ReportCount(1) 195 + ReportSize(8) 196 + Input(Var|Rel) 197 + // Byte 5 is the button state 198 + UsagePage_Button 199 + UsageRange_i8(0x01, 0x6) 200 + LogicalRange_i8(0x01, 0x6) 201 + ReportCount(1) 202 + ReportSize(8) 203 + Input(Arr|Abs) 204 + ) 205 + // Make sure we match our original report length 206 + FixedSizeVendorReport(PAD_REPORT_LENGTH) 207 + ) 208 + }; 209 + 210 + static const __u8 fixed_rdesc_pen[] = { 211 + UsagePage_Digitizers 212 + Usage_Dig_Pen 213 + CollectionApplication( 214 + // -- Byte 0 in report 215 + ReportId(PEN_REPORT_ID) 216 + Usage_Dig_Pen 217 + CollectionPhysical( 218 + // -- Byte 1 in report 219 + Usage_Dig_TipSwitch 220 + Usage_Dig_BarrelSwitch 221 + Usage_Dig_SecondaryBarrelSwitch // maps eraser to BTN_STYLUS2 222 + LogicalRange_i8(0, 1) 223 + ReportSize(1) 224 + ReportCount(3) 225 + Input(Var|Abs) 226 + ReportCount(4) // Padding 227 + Input(Const) 228 + Usage_Dig_InRange 229 + ReportCount(1) 230 + Input(Var|Abs) 231 + ReportSize(16) 232 + ReportCount(1) 233 + PushPop( 234 + UsagePage_GenericDesktop 235 + Unit(cm) 236 + UnitExponent(-1) 237 + PhysicalRange_i16(0, 160) 238 + LogicalRange_i16(0, 32767) 239 + Usage_GD_X 240 + Input(Var|Abs) // Bytes 2+3 241 + PhysicalRange_i16(0, 100) 242 + LogicalRange_i16(0, 32767) 243 + Usage_GD_Y 244 + Input(Var|Abs) // Bytes 4+5 245 + ) 246 + UsagePage_Digitizers 247 + Usage_Dig_TipPressure 248 + LogicalRange_i16(0, 8191) 249 + Input(Var|Abs) // Byte 6+7 250 + // Two bytes padding so we don't need to change the report at all 251 + ReportSize(8) 252 + ReportCount(2) 253 + Input(Const) // Byte 6+7 254 + ) 255 + ) 256 + }; 257 + 258 + static const __u8 fixed_rdesc_vendor[] = { 259 + UsagePage_Digitizers 260 + Usage_Dig_Pen 261 + CollectionApplication( 262 + // Byte 0 263 + // We leave the pen on the vendor report ID 264 + ReportId(VENDOR_REPORT_ID) 265 + Usage_Dig_Pen 266 + CollectionPhysical( 267 + // Byte 1 are the buttons 268 + LogicalRange_i8(0, 1) 269 + ReportSize(1) 270 + Usage_Dig_TipSwitch 271 + Usage_Dig_BarrelSwitch 272 + Usage_Dig_SecondaryBarrelSwitch 273 + ReportCount(3) 274 + Input(Var|Abs) 275 + ReportCount(4) // Padding 276 + Input(Const) 277 + Usage_Dig_InRange 278 + ReportCount(1) 279 + Input(Var|Abs) 280 + ReportSize(16) 281 + ReportCount(1) 282 + PushPop( 283 + UsagePage_GenericDesktop 284 + Unit(cm) 285 + UnitExponent(-1) 286 + // Note: reported logical range differs 287 + // from the pen report ID for x and y 288 + LogicalRange_i16(0, 32000) 289 + PhysicalRange_i16(0, 160) 290 + // Bytes 2/3 in report 291 + Usage_GD_X 292 + Input(Var|Abs) 293 + LogicalRange_i16(0, 20000) 294 + PhysicalRange_i16(0, 100) 295 + // Bytes 4/5 in report 296 + Usage_GD_Y 297 + Input(Var|Abs) 298 + ) 299 + // Bytes 6/7 in report 300 + LogicalRange_i16(0, 8192) 301 + Usage_Dig_TipPressure 302 + Input(Var|Abs) 303 + ) 304 + ) 305 + UsagePage_GenericDesktop 306 + Usage_GD_Keypad 307 + CollectionApplication( 308 + // Byte 0 309 + ReportId(PAD_REPORT_ID) 310 + LogicalRange_i8(0, 1) 311 + UsagePage_Digitizers 312 + Usage_Dig_TabletFunctionKeys 313 + CollectionPhysical( 314 + // Byte 1 are the buttons 315 + Usage_Dig_BarrelSwitch // BTN_STYLUS, needed so we get to be a tablet pad 316 + ReportCount(1) 317 + ReportSize(1) 318 + Input(Var|Abs) 319 + ReportCount(7) // Padding 320 + Input(Const) 321 + // Bytes 2/3 - x/y just exist so we get to be a tablet pad 322 + UsagePage_GenericDesktop 323 + Usage_GD_X 324 + Usage_GD_Y 325 + ReportCount(2) 326 + ReportSize(8) 327 + Input(Var|Abs) 328 + // Byte 4 is the button state 329 + UsagePage_Button 330 + UsageRange_i8(0x01, 0x6) 331 + LogicalRange_i8(0x0, 0x1) 332 + ReportCount(6) 333 + ReportSize(1) 334 + Input(Var|Abs) 335 + ReportCount(2) 336 + Input(Const) 337 + // Byte 5 is the wheel 338 + UsagePage_GenericDesktop 339 + Usage_GD_Wheel 340 + LogicalRange_i8(-1, 1) 341 + ReportCount(1) 342 + ReportSize(8) 343 + Input(Var|Rel) 344 + ) 345 + // Make sure we match our original report length 346 + FixedSizeVendorReport(VENDOR_REPORT_LENGTH) 347 + ) 348 + }; 349 + 350 + static const __u8 disabled_rdesc_pen[] = { 351 + FixedSizeVendorReport(PEN_REPORT_LENGTH) 352 + }; 353 + 354 + static const __u8 disabled_rdesc_pad[] = { 355 + FixedSizeVendorReport(PAD_REPORT_LENGTH) 356 + }; 357 + 358 + SEC(HID_BPF_RDESC_FIXUP) 359 + int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx) 360 + { 361 + __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, HID_MAX_DESCRIPTOR_SIZE /* size */); 362 + __s32 rdesc_size = hctx->size; 363 + __u8 have_fw_id; 364 + 365 + if (!data) 366 + return 0; /* EPERM check */ 367 + 368 + /* If we have a firmware ID and it matches our expected prefix, we 369 + * disable the default pad/pen nodes. They won't send events 370 + * but cause duplicate devices. 371 + */ 372 + have_fw_id = __builtin_memcmp(UDEV_PROP_HUION_FIRMWARE_ID, 373 + EXPECTED_FIRMWARE_ID, 374 + sizeof(EXPECTED_FIRMWARE_ID) - 1) == 0; 375 + if (rdesc_size == PAD_REPORT_DESCRIPTOR_LENGTH) { 376 + if (have_fw_id) { 377 + __builtin_memcpy(data, disabled_rdesc_pad, sizeof(disabled_rdesc_pad)); 378 + return sizeof(disabled_rdesc_pad); 379 + } 380 + 381 + __builtin_memcpy(data, fixed_rdesc_pad, sizeof(fixed_rdesc_pad)); 382 + return sizeof(fixed_rdesc_pad); 383 + } 384 + if (rdesc_size == PEN_REPORT_DESCRIPTOR_LENGTH) { 385 + if (have_fw_id) { 386 + __builtin_memcpy(data, disabled_rdesc_pen, sizeof(disabled_rdesc_pen)); 387 + return sizeof(disabled_rdesc_pen); 388 + } 389 + 390 + __builtin_memcpy(data, fixed_rdesc_pen, sizeof(fixed_rdesc_pen)); 391 + return sizeof(fixed_rdesc_pen); 392 + } 393 + /* Always fix the vendor mode so the tablet will work even if nothing sets 394 + * the udev property (e.g. huion-switcher run manually) 395 + */ 396 + if (rdesc_size == VENDOR_REPORT_DESCRIPTOR_LENGTH) { 397 + __builtin_memcpy(data, fixed_rdesc_vendor, sizeof(fixed_rdesc_vendor)); 398 + return sizeof(fixed_rdesc_vendor); 399 + 400 + } 401 + return 0; 402 + } 403 + 404 + SEC(HID_BPF_DEVICE_EVENT) 405 + int BPF_PROG(inspiroy_2_fix_events, struct hid_bpf_ctx *hctx) 406 + { 407 + __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 10 /* size */); 408 + 409 + if (!data) 410 + return 0; /* EPERM check */ 411 + 412 + /* Only sent if tablet is in default mode */ 413 + if (data[0] == PAD_REPORT_ID) { 414 + /* Nicely enough, this device only supports one button down at a time so 415 + * the reports are easy to match. Buttons numbered from the top 416 + * Button released: 03 00 00 00 00 00 00 00 417 + * Button 1: 03 00 05 00 00 00 00 00 -> b 418 + * Button 2: 03 00 0c 00 00 00 00 00 -> i 419 + * Button 3: 03 00 08 00 00 00 00 00 -> e 420 + * Button 4: 03 01 16 00 00 00 00 00 -> Ctrl S 421 + * Button 5: 03 00 2c 00 00 00 00 00 -> space 422 + * Button 6: 03 05 1d 00 00 00 00 00 -> Ctrl Alt Z 423 + * 424 + * Wheel down: 03 01 2d 00 00 00 00 00 -> Ctrl - 425 + * Wheel up: 03 01 2e 00 00 00 00 00 -> Ctrl = 426 + */ 427 + __u8 button = 0; 428 + __u8 wheel = 0; 429 + 430 + switch (data[1] << 8 | data[2]) { 431 + case 0x0000: 432 + break; 433 + case 0x0005: 434 + button = 1; 435 + break; 436 + case 0x000c: 437 + button = 2; 438 + break; 439 + case 0x0008: 440 + button = 3; 441 + break; 442 + case 0x0116: 443 + button = 4; 444 + break; 445 + case 0x002c: 446 + button = 5; 447 + break; 448 + case 0x051d: 449 + button = 6; 450 + break; 451 + case 0x012d: 452 + wheel = -1; 453 + break; 454 + case 0x012e: 455 + wheel = 1; 456 + break; 457 + 458 + } 459 + 460 + __u8 report[6] = {PAD_REPORT_ID, 0x0, 0x0, 0x0, wheel, button}; 461 + 462 + __builtin_memcpy(data, report, sizeof(report)); 463 + return sizeof(report); 464 + } 465 + 466 + /* Nothing to do for the PEN_REPORT_ID, it's already mapped */ 467 + 468 + /* Only sent if tablet is in raw mode */ 469 + if (data[0] == VENDOR_REPORT_ID) { 470 + /* Pad reports */ 471 + if (data[1] & 0x20) { 472 + /* See fixed_rdesc_pad */ 473 + struct pad_report { 474 + __u8 report_id; 475 + __u8 btn_stylus; 476 + __u8 x; 477 + __u8 y; 478 + __u8 buttons; 479 + __u8 wheel; 480 + } __attribute__((packed)) *pad_report; 481 + __u8 wheel = 0; 482 + 483 + /* Wheel report */ 484 + if (data[1] == 0xf1) { 485 + if (data[5] == 2) 486 + wheel = 0xff; 487 + else 488 + wheel = data[5]; 489 + } else { 490 + /* data[4] are the buttons, mapped correctly */ 491 + last_button_state = data[4]; 492 + wheel = 0; // wheel 493 + } 494 + 495 + pad_report = (struct pad_report *)data; 496 + 497 + pad_report->report_id = PAD_REPORT_ID; 498 + pad_report->btn_stylus = 0; 499 + pad_report->x = 0; 500 + pad_report->y = 0; 501 + pad_report->buttons = last_button_state; 502 + pad_report->wheel = wheel; 503 + 504 + return sizeof(struct pad_report); 505 + } 506 + 507 + /* Pen reports need nothing done */ 508 + } 509 + 510 + return 0; 511 + } 512 + 513 + HID_BPF_OPS(inspiroy_2) = { 514 + .hid_device_event = (void *)inspiroy_2_fix_events, 515 + .hid_rdesc_fixup = (void *)hid_fix_rdesc, 516 + }; 517 + 518 + SEC("syscall") 519 + int probe(struct hid_bpf_probe_args *ctx) 520 + { 521 + switch (ctx->rdesc_size) { 522 + case PAD_REPORT_DESCRIPTOR_LENGTH: 523 + case PEN_REPORT_DESCRIPTOR_LENGTH: 524 + case VENDOR_REPORT_DESCRIPTOR_LENGTH: 525 + ctx->retval = 0; 526 + break; 527 + default: 528 + ctx->retval = -EINVAL; 529 + } 530 + 531 + return 0; 532 + } 533 + 534 + char _license[] SEC("license") = "GPL";

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