mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-29 01:02:08 +00:00
a67a1deb11
Turns out that this is not compiling anymore because the hid_bpf_ops
struct_ops definition had a change during the revisions.
Fixes: e342d6f6f7 ("HID: samples: convert the 2 HID-BPF samples into struct_ops")
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
129 lines
2.6 KiB
C
129 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include "vmlinux.h"
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
#include "hid_bpf_helpers.h"
|
|
|
|
static int hid_y_event(struct hid_bpf_ctx *hctx)
|
|
{
|
|
s16 y;
|
|
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
|
|
|
|
if (!data)
|
|
return 0; /* EPERM check */
|
|
|
|
bpf_printk("event: size: %d", hctx->size);
|
|
bpf_printk("incoming event: %02x %02x %02x",
|
|
data[0],
|
|
data[1],
|
|
data[2]);
|
|
bpf_printk(" %02x %02x %02x",
|
|
data[3],
|
|
data[4],
|
|
data[5]);
|
|
bpf_printk(" %02x %02x %02x",
|
|
data[6],
|
|
data[7],
|
|
data[8]);
|
|
|
|
y = data[3] | (data[4] << 8);
|
|
|
|
y = -y;
|
|
|
|
data[3] = y & 0xFF;
|
|
data[4] = (y >> 8) & 0xFF;
|
|
|
|
bpf_printk("modified event: %02x %02x %02x",
|
|
data[0],
|
|
data[1],
|
|
data[2]);
|
|
bpf_printk(" %02x %02x %02x",
|
|
data[3],
|
|
data[4],
|
|
data[5]);
|
|
bpf_printk(" %02x %02x %02x",
|
|
data[6],
|
|
data[7],
|
|
data[8]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hid_x_event(struct hid_bpf_ctx *hctx)
|
|
{
|
|
s16 x;
|
|
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
|
|
|
|
if (!data)
|
|
return 0; /* EPERM check */
|
|
|
|
x = data[1] | (data[2] << 8);
|
|
|
|
x = -x;
|
|
|
|
data[1] = x & 0xFF;
|
|
data[2] = (x >> 8) & 0xFF;
|
|
return 0;
|
|
}
|
|
|
|
SEC("struct_ops/hid_device_event")
|
|
int BPF_PROG(hid_event, struct hid_bpf_ctx *hctx, enum hid_report_type type)
|
|
{
|
|
int ret = hid_y_event(hctx);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
return hid_x_event(hctx);
|
|
}
|
|
|
|
|
|
SEC("struct_ops/hid_rdesc_fixup")
|
|
int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
|
|
{
|
|
__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
|
|
|
|
if (!data)
|
|
return 0; /* EPERM check */
|
|
|
|
bpf_printk("rdesc: %02x %02x %02x",
|
|
data[0],
|
|
data[1],
|
|
data[2]);
|
|
bpf_printk(" %02x %02x %02x",
|
|
data[3],
|
|
data[4],
|
|
data[5]);
|
|
bpf_printk(" %02x %02x %02x ...",
|
|
data[6],
|
|
data[7],
|
|
data[8]);
|
|
|
|
/*
|
|
* The original report descriptor contains:
|
|
*
|
|
* 0x05, 0x01, // Usage Page (Generic Desktop) 30
|
|
* 0x16, 0x01, 0x80, // Logical Minimum (-32767) 32
|
|
* 0x26, 0xff, 0x7f, // Logical Maximum (32767) 35
|
|
* 0x09, 0x30, // Usage (X) 38
|
|
* 0x09, 0x31, // Usage (Y) 40
|
|
*
|
|
* So byte 39 contains Usage X and byte 41 Usage Y.
|
|
*
|
|
* We simply swap the axes here.
|
|
*/
|
|
data[39] = 0x31;
|
|
data[41] = 0x30;
|
|
|
|
return 0;
|
|
}
|
|
|
|
SEC(".struct_ops.link")
|
|
struct hid_bpf_ops mouse_invert = {
|
|
.hid_rdesc_fixup = (void *)hid_rdesc_fixup,
|
|
.hid_device_event = (void *)hid_event,
|
|
};
|
|
|
|
char _license[] SEC("license") = "GPL";
|