/* Filled in by udev-hid-bpf */ char UDEV_PROP_HUION_FIRMWARE_ID[64];
/* The prefix of the firmware ID we expect for this device. The full firmware * string has a date suffix, e.g. HUION_T21h_230511
*/ char EXPECTED_FIRMWARE_ID[] = "HUION_T21h_";
staticconst __u8 fixed_rdesc_vendor[] = {
UsagePage_GenericDesktop
Usage_GD_Keypad
CollectionApplication( // Byte 0 // We send our pad events on the vendor report id because why not
ReportId(VENDOR_REPORT_ID)
UsagePage_Digitizers
Usage_Dig_TabletFunctionKeys
CollectionPhysical( // Byte 1 is a button so we look like a tablet
Usage_Dig_BarrelSwitch // BTN_STYLUS, needed so we get to be a tablet pad
ReportCount(1)
ReportSize(1)
Input(Var|Abs)
ReportCount(7) // Padding
Input(Const) // Bytes 2/3 - x/y just exist so we get to be a tablet pad
UsagePage_GenericDesktop
Usage_GD_X
Usage_GD_Y
LogicalMinimum_i8(0x0)
LogicalMaximum_i8(0x1)
ReportCount(2)
ReportSize(8)
Input(Var|Abs) // Bytes 4-7 are the button state for 19 buttons + pad out to u32 // We send the first 10 buttons as buttons 1-10 which is BTN_0 -> BTN_9
UsagePage_Button
UsageMinimum_i8(1)
UsageMaximum_i8(10)
LogicalMinimum_i8(0x0)
LogicalMaximum_i8(0x1)
ReportCount(10)
ReportSize(1)
Input(Var|Abs) // We send the other 9 buttons as buttons 0x31 and above -> BTN_A - BTN_TL2
UsageMinimum_i8(0x31)
UsageMaximum_i8(0x3a)
ReportCount(9)
ReportSize(1)
Input(Var|Abs)
ReportCount(13)
ReportSize(1)
Input(Const) // padding // Byte 6 is the wheel
UsagePage_GenericDesktop
Usage_GD_Wheel
LogicalMinimum_i8(-1)
LogicalMaximum_i8(1)
ReportCount(1)
ReportSize(8)
Input(Var|Rel)
) // Make sure we match our original report length
FixedSizeVendorReport(VENDOR_REPORT_LENGTH)
)
};
/* Identical to fixed_rdesc_pad but with different FixedSizeVendorReport */ staticconst __u8 fixed_rdesc_pad[] = {
UsagePage_GenericDesktop
Usage_GD_Keypad
CollectionApplication( // Byte 0 // We send our pad events on the vendor report id because why not
ReportId(VENDOR_REPORT_ID)
UsagePage_Digitizers
Usage_Dig_TabletFunctionKeys
CollectionPhysical( // Byte 1 is a button so we look like a tablet
Usage_Dig_BarrelSwitch // BTN_STYLUS, needed so we get to be a tablet pad
ReportCount(1)
ReportSize(1)
Input(Var|Abs)
ReportCount(7) // Padding
Input(Const) // Bytes 2/3 - x/y just exist so we get to be a tablet pad
UsagePage_GenericDesktop
Usage_GD_X
Usage_GD_Y
LogicalMinimum_i8(0x0)
LogicalMaximum_i8(0x1)
ReportCount(2)
ReportSize(8)
Input(Var|Abs) // Bytes 4-7 are the button state for 19 buttons + pad out to u32 // We send the first 10 buttons as buttons 1-10 which is BTN_0 -> BTN_9
UsagePage_Button
UsageMinimum_i8(1)
UsageMaximum_i8(10)
LogicalMinimum_i8(0x0)
LogicalMaximum_i8(0x1)
ReportCount(10)
ReportSize(1)
Input(Var|Abs) // We send the other 9 buttons as buttons 0x31 and above -> BTN_A - BTN_TL2
UsageMinimum_i8(0x31)
UsageMaximum_i8(0x3a)
ReportCount(9)
ReportSize(1)
Input(Var|Abs)
ReportCount(13)
ReportSize(1)
Input(Const) // padding // Byte 6 is the wheel
UsagePage_GenericDesktop
Usage_GD_Wheel
LogicalMinimum_i8(-1)
LogicalMaximum_i8(1)
ReportCount(1)
ReportSize(8)
Input(Var|Rel)
) // Make sure we match our original report lengths
FixedSizeVendorReport(PAD_KBD_REPORT_LENGTH)
FixedSizeVendorReport(PAD_CC_REPORT_LENGTH)
FixedSizeVendorReport(PAD_MOUSE_REPORT_LENGTH)
)
};
/* If we have a firmware ID and it matches our expected prefix, we * disable the default pad/puck nodes. They won't send events * but cause duplicate devices.
*/
have_fw_id = __builtin_memcmp(UDEV_PROP_HUION_FIRMWARE_ID,
EXPECTED_FIRMWARE_ID, sizeof(EXPECTED_FIRMWARE_ID) - 1) == 0; if (rdesc_size == PAD_REPORT_DESCRIPTOR_LENGTH) { if (have_fw_id) {
__builtin_memcpy(data, disabled_rdesc_pad, sizeof(disabled_rdesc_pad)); returnsizeof(disabled_rdesc_pad);
} else {
__builtin_memcpy(data, fixed_rdesc_pad, sizeof(fixed_rdesc_pad)); returnsizeof(fixed_rdesc_pad);
}
} if (rdesc_size == PUCK_REPORT_DESCRIPTOR_LENGTH) { if (have_fw_id) {
__builtin_memcpy(data, disabled_rdesc_puck, sizeof(disabled_rdesc_puck)); returnsizeof(disabled_rdesc_puck);
}
} /* Always fix the vendor mode so the tablet will work even if nothing sets * the udev property (e.g. huion-switcher run manually)
*/ if (rdesc_size == VENDOR_REPORT_DESCRIPTOR_LENGTH) {
__builtin_memcpy(data, fixed_rdesc_vendor, sizeof(fixed_rdesc_vendor)); returnsizeof(fixed_rdesc_vendor);
/* Only sent if tablet is in raw mode */ if (data[0] == VENDOR_REPORT_ID) { /* See fixed_rdesc_pad */ struct pad_report {
__u8 report_id;
__u8 btn_stylus:1;
__u8 pad:7;
__u8 x;
__u8 y;
__u32 buttons;
__u8 wheel;
} __attribute__((packed)) *pad_report;
if (data[0] == PAD_KBD_REPORT_ID) { const __u8 button_mapping[] = {
0x0e, /* Button 1: K */
0x0a, /* Button 2: G */
0x0f, /* Button 3: L */
0x4c, /* Button 4: Delete */
0x0c, /* Button 5: I */
0x07, /* Button 6: D */
0x05, /* Button 7: B */
0x08, /* Button 8: E */
0x16, /* Button 9: S */
0x1d, /* Button 10: Z */
0x06, /* Button 11: C */
0x19, /* Button 12: V */
0xff, /* Button 13: LeftControl */
0xff, /* Button 14: LeftAlt */
0xff, /* Button 15: LeftShift */
0x28, /* Button 16: Return Enter */
0x2c, /* Button 17: Spacebar */
0x11, /* Button 18: N */
}; /* See fixed_rdesc_pad */ struct pad_report {
__u8 report_id;
__u8 btn_stylus:1;
__u8 pad:7;
__u8 x;
__u8 y;
__u32 buttons;
__u8 wheel;
} __attribute__((packed)) *pad_report; int i, b;
__u8 modifiers = data[1];
__u32 buttons = 0;
if (modifiers & 0x01) { /* Control */
buttons |= BIT(12);
} if (modifiers & 0x02) { /* Shift */
buttons |= BIT(14);
} if (modifiers & 0x04) { /* Alt */
buttons |= BIT(13);
}
for (i = 2; i < PAD_KBD_REPORT_LENGTH; i++) { if (!data[i]) break;
for (b = 0; b < ARRAY_SIZE(button_mapping); b++) { if (data[i] == button_mapping[b]) {
buttons |= BIT(b); break;
}
}
data[i] = 0;
}
pad_report = (struct pad_report *)data;
pad_report->report_id = VENDOR_REPORT_ID;
pad_report->btn_stylus = 0;
pad_report->x = 0;
pad_report->y = 0;
pad_report->buttons = buttons; // The wheel happens on a different hidraw node but its // values are unreliable (as is the button inside the wheel). // So the wheel is simply always zero, if you want the wheel // to work reliably, use the tablet mode.
pad_report->wheel = 0;
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