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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>
141 lines
3.0 KiB
C
141 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2022 Benjamin Tissoires
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*/
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "hid_bpf_helpers.h"
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#define HID_UP_BUTTON 0x0009
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#define HID_GD_WHEEL 0x0038
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SEC("struct_ops/hid_device_event")
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int BPF_PROG(hid_event, struct hid_bpf_ctx *hctx)
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{
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__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
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if (!data)
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return 0; /* EPERM check */
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/* Touch */
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data[1] &= 0xfd;
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/* X */
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data[4] = 0;
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data[5] = 0;
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/* Y */
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data[6] = 0;
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data[7] = 0;
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return 0;
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}
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/* 72 == 360 / 5 -> 1 report every 5 degrees */
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int resolution = 72;
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int physical = 5;
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struct haptic_syscall_args {
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unsigned int hid;
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int retval;
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};
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static __u8 haptic_data[8];
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SEC("syscall")
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int set_haptic(struct haptic_syscall_args *args)
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{
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struct hid_bpf_ctx *ctx;
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const size_t size = sizeof(haptic_data);
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u16 *res;
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int ret;
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if (size > sizeof(haptic_data))
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return -7; /* -E2BIG */
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ctx = hid_bpf_allocate_context(args->hid);
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if (!ctx)
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return -1; /* EPERM check */
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haptic_data[0] = 1; /* report ID */
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ret = hid_bpf_hw_request(ctx, haptic_data, size, HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
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bpf_printk("probed/remove event ret value: %d", ret);
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bpf_printk("buf: %02x %02x %02x",
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haptic_data[0],
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haptic_data[1],
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haptic_data[2]);
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bpf_printk(" %02x %02x %02x",
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haptic_data[3],
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haptic_data[4],
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haptic_data[5]);
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bpf_printk(" %02x %02x",
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haptic_data[6],
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haptic_data[7]);
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/* whenever resolution multiplier is not 3600, we have the fixed report descriptor */
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res = (u16 *)&haptic_data[1];
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if (*res != 3600) {
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// haptic_data[1] = 72; /* resolution multiplier */
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// haptic_data[2] = 0; /* resolution multiplier */
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// haptic_data[3] = 0; /* Repeat Count */
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haptic_data[4] = 3; /* haptic Auto Trigger */
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// haptic_data[5] = 5; /* Waveform Cutoff Time */
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// haptic_data[6] = 80; /* Retrigger Period */
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// haptic_data[7] = 0; /* Retrigger Period */
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} else {
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haptic_data[4] = 0;
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}
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ret = hid_bpf_hw_request(ctx, haptic_data, size, HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
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bpf_printk("set haptic ret value: %d -> %d", ret, haptic_data[4]);
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args->retval = ret;
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hid_bpf_release_context(ctx);
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return 0;
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}
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/* Convert REL_DIAL into REL_WHEEL */
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SEC("struct_ops/hid_rdesc_fixup")
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int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
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{
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__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
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__u16 *res, *phys;
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if (!data)
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return 0; /* EPERM check */
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/* Convert TOUCH into a button */
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data[31] = HID_UP_BUTTON;
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data[33] = 2;
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/* Convert REL_DIAL into REL_WHEEL */
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data[45] = HID_GD_WHEEL;
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/* Change Resolution Multiplier */
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phys = (__u16 *)&data[61];
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*phys = physical;
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res = (__u16 *)&data[66];
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*res = resolution;
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/* Convert X,Y from Abs to Rel */
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data[88] = 0x06;
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data[98] = 0x06;
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return 0;
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}
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SEC(".struct_ops.link")
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struct hid_bpf_ops surface_dial = {
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.hid_rdesc_fixup = (void *)hid_rdesc_fixup,
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.hid_device_event = (void *)hid_event,
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};
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char _license[] SEC("license") = "GPL";
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u32 _version SEC("version") = 1;
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