diff options
Diffstat (limited to 'drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c')
| -rw-r--r-- | drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c b/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c deleted file mode 100644 index c04abecab8ee..000000000000 --- a/drivers/hid/bpf/progs/Microsoft__XBox-Elite-2.bpf.c +++ /dev/null @@ -1,133 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* Copyright (c) 2024 Benjamin Tissoires - */ - -#include "vmlinux.h" -#include "hid_bpf.h" -#include "hid_bpf_helpers.h" -#include <bpf/bpf_tracing.h> - -#define VID_MICROSOFT 0x045e -#define PID_XBOX_ELITE_2 0x0b22 - -HID_BPF_CONFIG( - HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_GENERIC, VID_MICROSOFT, PID_XBOX_ELITE_2) -); - -/* - * When using the XBox Wireless Controller Elite 2 over Bluetooth, - * the device exports the paddle on the back of the device as a single - * bitfield value of usage "Assign Selection". - * - * The kernel doesn't process those usages properly and report KEY_UNKNOWN - * for it. - * - * SDL doesn't know how to interprete that KEY_UNKNOWN and thus ignores the paddles. - * - * Given that over USB the kernel uses BTN_TRIGGER_HAPPY[5-8], we - * can tweak the report descriptor to make the kernel interprete it properly: - * - we need an application collection of gamepad (so we have to close the current - * Consumer Control one) - * - we need to change the usage to be buttons from 0x15 to 0x18 - */ - -#define OFFSET_ASSIGN_SELECTION 211 -#define ORIGINAL_RDESC_SIZE 464 - -const __u8 rdesc_assign_selection[] = { - 0x0a, 0x99, 0x00, // Usage (Media Select Security) 211 - 0x15, 0x00, // Logical Minimum (0) 214 - 0x26, 0xff, 0x00, // Logical Maximum (255) 216 - 0x95, 0x01, // Report Count (1) 219 - 0x75, 0x04, // Report Size (4) 221 - 0x81, 0x02, // Input (Data,Var,Abs) 223 - 0x15, 0x00, // Logical Minimum (0) 225 - 0x25, 0x00, // Logical Maximum (0) 227 - 0x95, 0x01, // Report Count (1) 229 - 0x75, 0x04, // Report Size (4) 231 - 0x81, 0x03, // Input (Cnst,Var,Abs) 233 - 0x0a, 0x81, 0x00, // Usage (Assign Selection) 235 - 0x15, 0x00, // Logical Minimum (0) 238 - 0x26, 0xff, 0x00, // Logical Maximum (255) 240 - 0x95, 0x01, // Report Count (1) 243 - 0x75, 0x04, // Report Size (4) 245 - 0x81, 0x02, // Input (Data,Var,Abs) 247 -}; - -/* - * we replace the above report descriptor extract - * with the one below. - * To make things equal in size, we take out a larger - * portion than just the "Assign Selection" range, because - * we need to insert a new application collection to force - * the kernel to use BTN_TRIGGER_HAPPY[4-7]. - */ -const __u8 fixed_rdesc_assign_selection[] = { - 0x0a, 0x99, 0x00, // Usage (Media Select Security) 211 - 0x15, 0x00, // Logical Minimum (0) 214 - 0x26, 0xff, 0x00, // Logical Maximum (255) 216 - 0x95, 0x01, // Report Count (1) 219 - 0x75, 0x04, // Report Size (4) 221 - 0x81, 0x02, // Input (Data,Var,Abs) 223 - /* 0x15, 0x00, */ // Logical Minimum (0) ignored - 0x25, 0x01, // Logical Maximum (1) 225 - 0x95, 0x04, // Report Count (4) 227 - 0x75, 0x01, // Report Size (1) 229 - 0x81, 0x03, // Input (Cnst,Var,Abs) 231 - 0xc0, // End Collection 233 - 0x05, 0x01, // Usage Page (Generic Desktop) 234 - 0x0a, 0x05, 0x00, // Usage (Game Pad) 236 - 0xa1, 0x01, // Collection (Application) 239 - 0x05, 0x09, // Usage Page (Button) 241 - 0x19, 0x15, // Usage Minimum (21) 243 - 0x29, 0x18, // Usage Maximum (24) 245 - /* 0x15, 0x00, */ // Logical Minimum (0) ignored - /* 0x25, 0x01, */ // Logical Maximum (1) ignored - /* 0x95, 0x01, */ // Report Size (1) ignored - /* 0x75, 0x04, */ // Report Count (4) ignored - 0x81, 0x02, // Input (Data,Var,Abs) 247 -}; - -_Static_assert(sizeof(rdesc_assign_selection) == sizeof(fixed_rdesc_assign_selection), - "Rdesc and fixed rdesc of different size"); -_Static_assert(sizeof(rdesc_assign_selection) + OFFSET_ASSIGN_SELECTION < ORIGINAL_RDESC_SIZE, - "Rdesc at given offset is too big"); - -SEC("fmod_ret/hid_bpf_rdesc_fixup") -int BPF_PROG(hid_fix_rdesc, struct hid_bpf_ctx *hctx) -{ - __u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */); - - if (!data) - return 0; /* EPERM check */ - - /* Check that the device is compatible */ - if (__builtin_memcmp(data + OFFSET_ASSIGN_SELECTION, - rdesc_assign_selection, - sizeof(rdesc_assign_selection))) - return 0; - - __builtin_memcpy(data + OFFSET_ASSIGN_SELECTION, - fixed_rdesc_assign_selection, - sizeof(fixed_rdesc_assign_selection)); - - return 0; -} - -SEC("syscall") -int probe(struct hid_bpf_probe_args *ctx) -{ - /* only bind to the keyboard interface */ - ctx->retval = ctx->rdesc_size != ORIGINAL_RDESC_SIZE; - if (ctx->retval) - ctx->retval = -EINVAL; - - if (__builtin_memcmp(ctx->rdesc + OFFSET_ASSIGN_SELECTION, - rdesc_assign_selection, - sizeof(rdesc_assign_selection))) - ctx->retval = -EINVAL; - - return 0; -} - -char _license[] SEC("license") = "GPL"; |