media: rc: introduce BPF_PROG_LIRC_MODE2

Add support for BPF_PROG_LIRC_MODE2. This type of BPF program can call
rc_keydown() to reported decoded IR scancodes, or rc_repeat() to report
that the last key should be repeated.

The bpf program can be attached to using the bpf(BPF_PROG_ATTACH) syscall;
the target_fd must be the /dev/lircN device.

Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index e254526d6744..7365d79ae00d 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -11,6 +11,7 @@
  */
 #include <linux/bpf.h>
 #include <linux/bpf_trace.h>
+#include <linux/bpf_lirc.h>
 #include <linux/btf.h>
 #include <linux/syscalls.h>
 #include <linux/slab.h>
@@ -1582,6 +1583,8 @@ static int bpf_prog_attach(const union bpf_attr *attr)
         case BPF_SK_SKB_STREAM_PARSER:
         case BPF_SK_SKB_STREAM_VERDICT:
                 return sockmap_get_from_fd(attr, BPF_PROG_TYPE_SK_SKB, true);
+        case BPF_LIRC_MODE2:
+                return lirc_prog_attach(attr);
         default:
                 return -EINVAL;
         }
@@ -1654,6 +1657,8 @@ static int bpf_prog_detach(const union bpf_attr *attr)
         case BPF_SK_SKB_STREAM_PARSER:
         case BPF_SK_SKB_STREAM_VERDICT:
                 return sockmap_get_from_fd(attr, BPF_PROG_TYPE_SK_SKB, false);
+        case BPF_LIRC_MODE2:
+                return lirc_prog_detach(attr);
         default:
                 return -EINVAL;
         }
@@ -1703,6 +1708,8 @@ static int bpf_prog_query(const union bpf_attr *attr,
         case BPF_CGROUP_SOCK_OPS:
         case BPF_CGROUP_DEVICE:
                 break;
+        case BPF_LIRC_MODE2:
+                return lirc_prog_query(attr, uattr);
         default:
                 return -EINVAL;
         }