diff options
| author | Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2022-11-03 16:57:51 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2022-11-15 16:28:39 +0100 |
| commit | ad190df11a024c1214fbc8dcaab72c592c79d9b5 (patch) | |
| tree | 3ff7fc64a04187c78f64a37408001b93186de03a /drivers/hid/bpf/hid_bpf_jmp_table.c | |
| parent | 4f7153cf461ed0f78d8da8c9fd02d38728a76b90 (diff) | |
HID: bpf: allow to change the report descriptor
Add a new tracepoint hid_bpf_rdesc_fixup() so we can trigger a
report descriptor fixup in the bpf world.
Whenever the program gets attached/detached, the device is reconnected
meaning that userspace will see it disappearing and reappearing with
the new report descriptor.
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/bpf/hid_bpf_jmp_table.c')
| -rw-r--r-- | drivers/hid/bpf/hid_bpf_jmp_table.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c index bfcdd7b805a9..579a6c06906e 100644 --- a/drivers/hid/bpf/hid_bpf_jmp_table.c +++ b/drivers/hid/bpf/hid_bpf_jmp_table.c @@ -58,12 +58,15 @@ static DECLARE_WORK(release_work, hid_bpf_release_progs); BTF_ID_LIST(hid_bpf_btf_ids) BTF_ID(func, hid_bpf_device_event) /* HID_BPF_PROG_TYPE_DEVICE_EVENT */ +BTF_ID(func, hid_bpf_rdesc_fixup) /* HID_BPF_PROG_TYPE_RDESC_FIXUP */ static int hid_bpf_max_programs(enum hid_bpf_prog_type type) { switch (type) { case HID_BPF_PROG_TYPE_DEVICE_EVENT: return HID_BPF_MAX_PROGS_PER_DEV; + case HID_BPF_PROG_TYPE_RDESC_FIXUP: + return 1; default: return -EINVAL; } @@ -233,6 +236,10 @@ static void hid_bpf_release_progs(struct work_struct *work) if (next->hdev == hdev && next->type == type) next->hdev = NULL; } + + /* if type was rdesc fixup, reconnect device */ + if (type == HID_BPF_PROG_TYPE_RDESC_FIXUP) + hid_bpf_reconnect(hdev); } } |