Add grundig decoder and infrastructure for build bpf protocols.
Signed-off-by: Sean Young <sean@xxxxxxxx>
---
configure.ac | 4 +
utils/keytable/Makefile.am | 4 +
utils/keytable/bpf_protocols/Makefile.am | 21 ++
utils/keytable/bpf_protocols/bpf_helpers.h | 302 ++++++++++++++++++
utils/keytable/bpf_protocols/grundig.c | 130 ++++++++
utils/keytable/bpf_protocols/manchester.c | 179 +++++++++++
utils/keytable/bpf_protocols/pulse_distance.c | 133 ++++++++
utils/keytable/bpf_protocols/rc_mm.c | 144 +++++++++
utils/keytable/rc_keymaps_bpf/RP75_LCD.toml | 45 +++
v4l-utils.spec.in | 2 +-
10 files changed, 963 insertions(+), 1 deletion(-)
create mode 100644 utils/keytable/bpf_protocols/Makefile.am
create mode 100644 utils/keytable/bpf_protocols/bpf_helpers.h
create mode 100644 utils/keytable/bpf_protocols/grundig.c
create mode 100644 utils/keytable/bpf_protocols/manchester.c
create mode 100644 utils/keytable/bpf_protocols/pulse_distance.c
create mode 100644 utils/keytable/bpf_protocols/rc_mm.c
create mode 100644 utils/keytable/rc_keymaps_bpf/RP75_LCD.toml
diff --git a/configure.ac b/configure.ac
index 1f48913c..58c89e74 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,6 +23,7 @@ AC_CONFIG_FILES([Makefile
utils/libmedia_dev/Makefile
utils/dvb/Makefile
utils/keytable/Makefile
+ utils/keytable/bpf_protocols/Makefile
utils/ir-ctl/Makefile
utils/cx18-ctl/Makefile
utils/ivtv-ctl/Makefile
@@ -172,11 +173,14 @@ AC_SUBST([LIBELF_CFLAGS])
AC_SUBST([LIBELF_LIBS])
AM_CONDITIONAL([HAVE_LIBELF], [test x$libelf_pkgconfig = xyes])
if test "x$libelf_pkgconfig" = "xyes"; then
+ AC_CHECK_PROG([CLANG], clang, clang)
AC_DEFINE([HAVE_LIBELF], [1], [libelf library is present])
else
AC_MSG_WARN(libelf library not available)
fi
+AM_CONDITIONAL([BPF_PROTOCOLS], [test x$CLANG = xclang])
+
AS_IF([test "x$x11_pkgconfig" = xyes],
[PKG_CHECK_MODULES(GL, [gl], [gl_pkgconfig=yes], [gl_pkgconfig=no])], [gl_pkgconfig=no])
AC_SUBST([GL_CFLAGS])
diff --git a/utils/keytable/Makefile.am b/utils/keytable/Makefile.am
index df2b2231..90e4c8c8 100644
--- a/utils/keytable/Makefile.am
+++ b/utils/keytable/Makefile.am
@@ -13,6 +13,10 @@ endif
ir_keytable_LDADD = @LIBINTL@
ir_keytable_LDFLAGS = $(ARGP_LIBS) $(LIBELF_LIBS)
+if BPF_PROTOCOLS
+SUBDIRS = bpf_protocols
+endif
+
EXTRA_DIST = 70-infrared.rules rc_keymaps rc_keymaps_userspace gen_keytables.pl ir-keytable.1 rc_maps.cfg
# custom target
diff --git a/utils/keytable/bpf_protocols/Makefile.am b/utils/keytable/bpf_protocols/Makefile.am
new file mode 100644
index 00000000..6ab2966e
--- /dev/null
+++ b/utils/keytable/bpf_protocols/Makefile.am
@@ -0,0 +1,21 @@
+# Get Clang's default includes on this system, as opposed to those seen by
+# '-target bpf'. This fixes "missing" files on some architectures/distros,
+# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
+#
+# Use '-idirafter': Don't interfere with include mechanics except where the
+# build would have failed anyways.
+CLANG_SYS_INCLUDES := $(shell $(CLANG) -v -E - </dev/null 2>&1 \
+ | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }')
+
+%.o: %.c
+ $(CLANG) $(CLANG_SYS_INCLUDES) -I$(top_srcdir)/include -target bpf -O2 -c $<
+
+PROTOCOLS = grundig.o pulse_distance.o rc_mm.o manchester.o
+
+all: $(PROTOCOLS)
+
+# custom target
+install-data-local:
+ $(install_sh) -d "$(DESTDIR)$(keytableuserdir)/protocols"
+ $(install_sh) -d "$(DESTDIR)$(keytablesystemdir)/protocols"
+ $(install_sh) $(PROTOCOLS) "$(DESTDIR)$(keytablesysstemdir)/protocols"
diff --git a/utils/keytable/bpf_protocols/bpf_helpers.h b/utils/keytable/bpf_protocols/bpf_helpers.h
new file mode 100644
index 00000000..a6864827
--- /dev/null
+++ b/utils/keytable/bpf_protocols/bpf_helpers.h
@@ -0,0 +1,302 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __BPF_HELPERS_H
+#define __BPF_HELPERS_H
+
+/* helper macro to place programs, maps, license in
+ * different sections in elf_bpf file. Section names
+ * are interpreted by elf_bpf loader
+ */
+#define SEC(NAME) __attribute__((section(NAME), used))
+
+/* helper functions called from eBPF programs written in C */
+static void *(*bpf_map_lookup_elem)(void *map, void *key) =
+ (void *) BPF_FUNC_map_lookup_elem;
+static int (*bpf_map_update_elem)(void *map, void *key, void *value,
+ unsigned long long flags) =
+ (void *) BPF_FUNC_map_update_elem;
+static int (*bpf_map_delete_elem)(void *map, void *key) =
+ (void *) BPF_FUNC_map_delete_elem;
+static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) =
+ (void *) BPF_FUNC_probe_read;
+static unsigned long long (*bpf_ktime_get_ns)(void) =
+ (void *) BPF_FUNC_ktime_get_ns;
+static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
+ (void *) BPF_FUNC_trace_printk;
+static void (*bpf_tail_call)(void *ctx, void *map, int index) =
+ (void *) BPF_FUNC_tail_call;
+static unsigned long long (*bpf_get_smp_processor_id)(void) =
+ (void *) BPF_FUNC_get_smp_processor_id;
+static unsigned long long (*bpf_get_current_pid_tgid)(void) =
+ (void *) BPF_FUNC_get_current_pid_tgid;
+static unsigned long long (*bpf_get_current_uid_gid)(void) =
+ (void *) BPF_FUNC_get_current_uid_gid;
+static int (*bpf_get_current_comm)(void *buf, int buf_size) =
+ (void *) BPF_FUNC_get_current_comm;
+static unsigned long long (*bpf_perf_event_read)(void *map,
+ unsigned long long flags) =
+ (void *) BPF_FUNC_perf_event_read;
+static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
+ (void *) BPF_FUNC_clone_redirect;
+static int (*bpf_redirect)(int ifindex, int flags) =
+ (void *) BPF_FUNC_redirect;
+static int (*bpf_redirect_map)(void *map, int key, int flags) =
+ (void *) BPF_FUNC_redirect_map;
+static int (*bpf_perf_event_output)(void *ctx, void *map,
+ unsigned long long flags, void *data,
+ int size) =
+ (void *) BPF_FUNC_perf_event_output;
+static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
+ (void *) BPF_FUNC_get_stackid;
+static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
+ (void *) BPF_FUNC_probe_write_user;
+static int (*bpf_current_task_under_cgroup)(void *map, int index) =
+ (void *) BPF_FUNC_current_task_under_cgroup;
+static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
+ (void *) BPF_FUNC_skb_get_tunnel_key;
+static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
+ (void *) BPF_FUNC_skb_set_tunnel_key;
+static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
+ (void *) BPF_FUNC_skb_get_tunnel_opt;
+static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
+ (void *) BPF_FUNC_skb_set_tunnel_opt;
+static unsigned long long (*bpf_get_prandom_u32)(void) =
+ (void *) BPF_FUNC_get_prandom_u32;
+static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
+ (void *) BPF_FUNC_xdp_adjust_head;
+static int (*bpf_xdp_adjust_meta)(void *ctx, int offset) =
+ (void *) BPF_FUNC_xdp_adjust_meta;
+static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval,
+ int optlen) =
+ (void *) BPF_FUNC_setsockopt;
+static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval,
+ int optlen) =
+ (void *) BPF_FUNC_getsockopt;
+static int (*bpf_sock_ops_cb_flags_set)(void *ctx, int flags) =
+ (void *) BPF_FUNC_sock_ops_cb_flags_set;
+static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) =
+ (void *) BPF_FUNC_sk_redirect_map;
+static int (*bpf_sk_redirect_hash)(void *ctx, void *map, void *key, int flags) =
+ (void *) BPF_FUNC_sk_redirect_hash;
+static int (*bpf_sock_map_update)(void *map, void *key, void *value,
+ unsigned long long flags) =
+ (void *) BPF_FUNC_sock_map_update;
+static int (*bpf_sock_hash_update)(void *map, void *key, void *value,
+ unsigned long long flags) =
+ (void *) BPF_FUNC_sock_hash_update;
+static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags,
+ void *buf, unsigned int buf_size) =
+ (void *) BPF_FUNC_perf_event_read_value;
+static int (*bpf_perf_prog_read_value)(void *ctx, void *buf,
+ unsigned int buf_size) =
+ (void *) BPF_FUNC_perf_prog_read_value;
+static int (*bpf_override_return)(void *ctx, unsigned long rc) =
+ (void *) BPF_FUNC_override_return;
+static int (*bpf_msg_redirect_map)(void *ctx, void *map, int key, int flags) =
+ (void *) BPF_FUNC_msg_redirect_map;
+static int (*bpf_msg_redirect_hash)(void *ctx,
+ void *map, void *key, int flags) =
+ (void *) BPF_FUNC_msg_redirect_hash;
+static int (*bpf_msg_apply_bytes)(void *ctx, int len) =
+ (void *) BPF_FUNC_msg_apply_bytes;
+static int (*bpf_msg_cork_bytes)(void *ctx, int len) =
+ (void *) BPF_FUNC_msg_cork_bytes;
+static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) =
+ (void *) BPF_FUNC_msg_pull_data;
+static int (*bpf_bind)(void *ctx, void *addr, int addr_len) =
+ (void *) BPF_FUNC_bind;
+static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) =
+ (void *) BPF_FUNC_xdp_adjust_tail;
+static int (*bpf_skb_get_xfrm_state)(void *ctx, int index, void *state,
+ int size, int flags) =
+ (void *) BPF_FUNC_skb_get_xfrm_state;
+static int (*bpf_get_stack)(void *ctx, void *buf, int size, int flags) =
+ (void *) BPF_FUNC_get_stack;
+static int (*bpf_fib_lookup)(void *ctx, struct bpf_fib_lookup *params,
+ int plen, __u32 flags) =
+ (void *) BPF_FUNC_fib_lookup;
+static int (*bpf_rc_repeat)(void *ctx) =
+ (void *) BPF_FUNC_rc_repeat;
+static int (*bpf_rc_keydown)(void *ctx, unsigned int protocol,
+ unsigned long long scancode, unsigned int toggle) =
+ (void *) BPF_FUNC_rc_keydown;
+
+
+/* llvm builtin functions that eBPF C program may use to
+ * emit BPF_LD_ABS and BPF_LD_IND instructions
+ */
+struct sk_buff;
+unsigned long long load_byte(void *skb,
+ unsigned long long off) asm("llvm.bpf.load.byte");
+unsigned long long load_half(void *skb,
+ unsigned long long off) asm("llvm.bpf.load.half");
+unsigned long long load_word(void *skb,
+ unsigned long long off) asm("llvm.bpf.load.word");
+
+/* a helper structure used by eBPF C program
+ * to describe map attributes to elf_bpf loader
+ */
+struct bpf_map_def {
+ unsigned int type;
+ unsigned int key_size;
+ unsigned int value_size;
+ unsigned int max_entries;
+ unsigned int map_flags;
+ unsigned int inner_map_idx;
+ unsigned int numa_node;
+};
+
+static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
+ (void *) BPF_FUNC_skb_load_bytes;
+static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
+ (void *) BPF_FUNC_skb_store_bytes;
+static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
+ (void *) BPF_FUNC_l3_csum_replace;
+static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
+ (void *) BPF_FUNC_l4_csum_replace;
+static int (*bpf_csum_diff)(void *from, int from_size, void *to, int to_size, int seed) =
+ (void *) BPF_FUNC_csum_diff;
+static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
+ (void *) BPF_FUNC_skb_under_cgroup;
+static int (*bpf_skb_change_head)(void *, int len, int flags) =
+ (void *) BPF_FUNC_skb_change_head;
+static int (*bpf_skb_pull_data)(void *, int len) =
+ (void *) BPF_FUNC_skb_pull_data;
+
+/* Scan the ARCH passed in from ARCH env variable (see Makefile) */
+#if defined(__TARGET_ARCH_x86)
+ #define bpf_target_x86
+ #define bpf_target_defined
+#elif defined(__TARGET_ARCH_s930x)
+ #define bpf_target_s930x
+ #define bpf_target_defined
+#elif defined(__TARGET_ARCH_arm64)
+ #define bpf_target_arm64
+ #define bpf_target_defined
+#elif defined(__TARGET_ARCH_mips)
+ #define bpf_target_mips
+ #define bpf_target_defined
+#elif defined(__TARGET_ARCH_powerpc)
+ #define bpf_target_powerpc
+ #define bpf_target_defined
+#elif defined(__TARGET_ARCH_sparc)
+ #define bpf_target_sparc
+ #define bpf_target_defined
+#else
+ #undef bpf_target_defined
+#endif
+
+/* Fall back to what the compiler says */
+#ifndef bpf_target_defined
+#if defined(__x86_64__)
+ #define bpf_target_x86
+#elif defined(__s390x__)
+ #define bpf_target_s930x
+#elif defined(__aarch64__)
+ #define bpf_target_arm64
+#elif defined(__mips__)
+ #define bpf_target_mips
+#elif defined(__powerpc__)
+ #define bpf_target_powerpc
+#elif defined(__sparc__)
+ #define bpf_target_sparc
+#endif
+#endif
+
+#if defined(bpf_target_x86)
+
+#define PT_REGS_PARM1(x) ((x)->di)
+#define PT_REGS_PARM2(x) ((x)->si)
+#define PT_REGS_PARM3(x) ((x)->dx)
+#define PT_REGS_PARM4(x) ((x)->cx)
+#define PT_REGS_PARM5(x) ((x)->r8)
+#define PT_REGS_RET(x) ((x)->sp)
+#define PT_REGS_FP(x) ((x)->bp)
+#define PT_REGS_RC(x) ((x)->ax)
+#define PT_REGS_SP(x) ((x)->sp)
+#define PT_REGS_IP(x) ((x)->ip)
+
+#elif defined(bpf_target_s390x)
+
+#define PT_REGS_PARM1(x) ((x)->gprs[2])
+#define PT_REGS_PARM2(x) ((x)->gprs[3])
+#define PT_REGS_PARM3(x) ((x)->gprs[4])
+#define PT_REGS_PARM4(x) ((x)->gprs[5])
+#define PT_REGS_PARM5(x) ((x)->gprs[6])
+#define PT_REGS_RET(x) ((x)->gprs[14])
+#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
+#define PT_REGS_RC(x) ((x)->gprs[2])
+#define PT_REGS_SP(x) ((x)->gprs[15])
+#define PT_REGS_IP(x) ((x)->psw.addr)
+
+#elif defined(bpf_target_arm64)
+
+#define PT_REGS_PARM1(x) ((x)->regs[0])
+#define PT_REGS_PARM2(x) ((x)->regs[1])
+#define PT_REGS_PARM3(x) ((x)->regs[2])
+#define PT_REGS_PARM4(x) ((x)->regs[3])
+#define PT_REGS_PARM5(x) ((x)->regs[4])
+#define PT_REGS_RET(x) ((x)->regs[30])
+#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
+#define PT_REGS_RC(x) ((x)->regs[0])
+#define PT_REGS_SP(x) ((x)->sp)
+#define PT_REGS_IP(x) ((x)->pc)
+
+#elif defined(bpf_target_mips)
+
+#define PT_REGS_PARM1(x) ((x)->regs[4])
+#define PT_REGS_PARM2(x) ((x)->regs[5])
+#define PT_REGS_PARM3(x) ((x)->regs[6])
+#define PT_REGS_PARM4(x) ((x)->regs[7])
+#define PT_REGS_PARM5(x) ((x)->regs[8])
+#define PT_REGS_RET(x) ((x)->regs[31])
+#define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
+#define PT_REGS_RC(x) ((x)->regs[1])
+#define PT_REGS_SP(x) ((x)->regs[29])
+#define PT_REGS_IP(x) ((x)->cp0_epc)
+
+#elif defined(bpf_target_powerpc)
+
+#define PT_REGS_PARM1(x) ((x)->gpr[3])
+#define PT_REGS_PARM2(x) ((x)->gpr[4])
+#define PT_REGS_PARM3(x) ((x)->gpr[5])
+#define PT_REGS_PARM4(x) ((x)->gpr[6])
+#define PT_REGS_PARM5(x) ((x)->gpr[7])
+#define PT_REGS_RC(x) ((x)->gpr[3])
+#define PT_REGS_SP(x) ((x)->sp)
+#define PT_REGS_IP(x) ((x)->nip)
+
+#elif defined(bpf_target_sparc)
+
+#define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
+#define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
+#define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
+#define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
+#define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
+#define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
+#define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
+#define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
+
+/* Should this also be a bpf_target check for the sparc case? */
+#if defined(__arch64__)
+#define PT_REGS_IP(x) ((x)->tpc)
+#else
+#define PT_REGS_IP(x) ((x)->pc)
+#endif
+
+#endif
+
+#ifdef bpf_target_powerpc
+#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
+#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
+#elif bpf_target_sparc
+#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); })
+#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
+#else
+#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
+ bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
+#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
+ bpf_probe_read(&(ip), sizeof(ip), \
+ (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
+#endif
+
+#endif
diff --git a/utils/keytable/bpf_protocols/grundig.c b/utils/keytable/bpf_protocols/grundig.c
new file mode 100644
index 00000000..a89053b3
--- /dev/null
+++ b/utils/keytable/bpf_protocols/grundig.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (C) 2018 Sean Young <sean@xxxxxxxx>
+
+#include <linux/lirc.h>
+#include <linux/bpf.h>
+
+#include "bpf_helpers.h"
+
+enum grundig_state {
+ STATE_INACTIVE,
+ STATE_HEADER_SPACE,
+ STATE_LEADING_PULSE,
+ STATE_BITS_SPACE,
+ STATE_BITS_PULSE,
+};
+
+struct decoder_state {
+ unsigned int bits;
+ enum grundig_state state;
+ unsigned int count;
+ unsigned int last_space;
+};
+
+struct bpf_map_def SEC("maps") decoder_state_map = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(unsigned int),
+ .value_size = sizeof(struct decoder_state),
+ .max_entries = 1,
+};
+
+static inline int eq_margin(unsigned d1, unsigned d2, unsigned margin)
+{
+ return ((d1 > (d2 - margin)) && (d1 < (d2 + margin)));
+}
+
+// These values can be overridden in the rc_keymap toml
+//
+// We abuse elf relocations. We cast the address of these variables to
+// an int, so that the compiler emits a mov immediate for the address
+// but uses it as an int. The bpf loader replaces the relocation with the
+// actual value (either overridden or taken from the data segment).
+int header_pulse = 900;
+int header_space = 2900;
+int leader_pulse = 1300;
+
+#define BPF_PARAM(x) (int)(&(x))
+
+SEC("grundig")
+int bpf_decoder(unsigned int *sample)
+{
+ unsigned int key = 0;
+ struct decoder_state *s = bpf_map_lookup_elem(&decoder_state_map, &key);
+ struct decoder_state init = {};
+
+ if (!s)
+ s = &init;
+
+ switch (*sample & LIRC_MODE2_MASK) {
+ case LIRC_MODE2_SPACE:
+ case LIRC_MODE2_PULSE:
+ case LIRC_MODE2_TIMEOUT:
+ break;
+ default:
+ // not a timing events
+ return 0;
+ }
+
+ int duration = LIRC_VALUE(*sample);
+
+ if (s->state == STATE_INACTIVE) {
+ if (LIRC_IS_PULSE(*sample) && eq_margin(BPF_PARAM(header_pulse), duration, 100)) {
+ s->bits = 0;
+ s->state = STATE_HEADER_SPACE;
+ s->count = 0;
+ }
+ } else if (s->state == STATE_HEADER_SPACE) {
+ if (LIRC_IS_SPACE(*sample) && eq_margin(BPF_PARAM(header_space), duration, 200))
+ s->state = STATE_LEADING_PULSE;
+ else
+ s->state = STATE_INACTIVE;
+ } else if (s->state == STATE_LEADING_PULSE) {
+ if (LIRC_IS_PULSE(*sample) && eq_margin(BPF_PARAM(leader_pulse), duration, 100))
+ s->state = STATE_BITS_SPACE;
+ else
+ s->state = STATE_INACTIVE;
+ } else if (s->state == STATE_BITS_SPACE) {
+ s->last_space = duration;
+ s->state = STATE_BITS_PULSE;
+ } else if (s->state == STATE_BITS_PULSE) {
+ int t = -1;
+ if (eq_margin(s->last_space, (472), (150)) &&
+ eq_margin(duration, (583), (150)))
+ t = 0;
+ if (eq_margin(s->last_space, (1139), (150)) &&
+ eq_margin(duration, (583), (150)))
+ t = 1;
+ if (eq_margin(s->last_space, (1806), (150)) &&
+ eq_margin(duration, (583), (150)))
+ t = 2;
+ if (eq_margin(s->last_space, (2200), (150)) &&
+ eq_margin(duration, (1139), (150)))
+ t = 3;
+ if (t < 0) {
+ s->state = STATE_INACTIVE;
+ } else {
+ s->bits <<= 2;
+ switch (t) {
+ case 3: s->bits |= 0; break;
+ case 2: s->bits |= 3; break;
+ case 1: s->bits |= 2; break;
+ case 0: s->bits |= 1; break;
+ }
+ s->count += 2;
+ if (s->count == 16) {
+ bpf_rc_keydown(sample, 0x40, s->bits, 0);
+ s->state = STATE_INACTIVE;
+ } else {
+ s->state = STATE_BITS_SPACE;
+ }
+ }
+ }
+
+ if (s == &init)
+ bpf_map_update_elem(&decoder_state_map, &key, s, BPF_NOEXIST);
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/utils/keytable/bpf_protocols/manchester.c b/utils/keytable/bpf_protocols/manchester.c
new file mode 100644
index 00000000..81466f7f
--- /dev/null
+++ b/utils/keytable/bpf_protocols/manchester.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (C) 2018 Sean Young <sean@xxxxxxxx>
+
+#include <linux/lirc.h>
+#include <linux/bpf.h>
+
+#include "bpf_helpers.h"
+
+struct decoder_state {
+ unsigned int state;
+ unsigned int bits;
+ unsigned int count;
+};
+
+struct bpf_map_def SEC("maps") decoder_state_map = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(unsigned int),
+ .value_size = sizeof(struct decoder_state),
+ .max_entries = 1,
+};
+
+// These values can be overridden in the rc_keymap toml
+//
+// We abuse elf relocations. We cast the address of these variables to
+// an int, so that the compiler emits a mov immediate for the address
+// but uses it as an int. The bpf loader replaces the relocation with the
+// actual value (either overridden or taken from the data segment).
+//
+// See:
+// http://clearwater.com.au/code/rc5
+// https://github.com/guyc/RC5/blob/master/RC5.cpp
+// The default parameters are set up for rc5 decoding. Note that the decoded
+// value differs from the in-kernel rc5 decoder (FIXME).
+int margin = 100;
+int header_pulse = 0;
+int min_short = 444;
+int max_short = 1333;
+int min_long = 1334;
+int max_long = 2222;
+int toggle_bit = 11;
+int bits = 14;
+int protocol = 66;
+
+#define BPF_PARAM(x) (int)(&(x))
+
+static inline int eq_margin(unsigned d1, unsigned d2)
+{
+ return ((d1 > (d2 - BPF_PARAM(margin))) && (d1 < (d2 + BPF_PARAM(margin))));
+}
+
+#define STATE_INACTIVE 0
+#define STATE_HEADER 1
+#define STATE_START1 2
+#define STATE_MID1 3
+#define STATE_MID0 4
+#define STATE_START0 5
+
+#define EVENT_MATCH 1
+#define EVENT_PULSE 2
+#define EVENT_LONG 4
+
+#define EVENT_SHORTSPACE 1
+#define EVENT_SHORTPULSE 3
+#define EVENT_LONGSPACE 5
+#define EVENT_LONGPULSE 7
+
+static int emitBit(unsigned int *sample, struct decoder_state *s, int bit, int state)
+{
+ s->bits <<= 1;
+ s->bits |= bit;
+ s->count++;
+
+ if (s->count == BPF_PARAM(bits)) {
+ unsigned int toggle = 0;
+ if (BPF_PARAM(toggle_bit) >= 0) {
+ unsigned int mask = 1 << BPF_PARAM(toggle_bit);
+ if (s->bits & mask)
+ toggle = 1;
+ s->bits &= ~mask;
+ }
+
+ bpf_rc_keydown(sample, BPF_PARAM(protocol), s->bits, toggle);
+ state = STATE_INACTIVE;
+ }
+
+ return state;
+}
+
+SEC("manchester")
+int bpf_decoder(unsigned int *sample)
+{
+ unsigned int key = 0;
+ struct decoder_state *s = bpf_map_lookup_elem(&decoder_state_map, &key);
+ struct decoder_state init = {};
+
+ if (!s)
+ s = &init;
+
+ switch (*sample & LIRC_MODE2_MASK) {
+ case LIRC_MODE2_SPACE:
+ case LIRC_MODE2_PULSE:
+ case LIRC_MODE2_TIMEOUT:
+ break;
+ default:
+ // not a timing events
+ return 0;
+ }
+
+ int duration = LIRC_VALUE(*sample);
+
+ unsigned event = 0;
+
+ if (LIRC_IS_PULSE(*sample))
+ event |= EVENT_PULSE;
+ if (duration >= BPF_PARAM(min_long) && duration <= BPF_PARAM(max_long)) {
+ event |= EVENT_LONG | EVENT_MATCH;
+ } else if (duration >= BPF_PARAM(min_short) && duration <= BPF_PARAM(max_short)) {
+ event |= EVENT_MATCH;
+ }
+
+ unsigned int newState = s->state;
+
+ switch (s->state) {
+ case STATE_INACTIVE:
+ if (BPF_PARAM(header_pulse)) {
+ if (LIRC_IS_PULSE(*sample) &&
+ eq_margin(BPF_PARAM(header_pulse), duration)) {
+ s->state = STATE_HEADER;
+ }
+ break;
+ }
+ /* pass through */
+ case STATE_HEADER:
+ s->bits = 1;
+ s->count = 1;
+ /* pass through */
+ case STATE_MID1:
+ switch (event) {
+ case EVENT_LONGPULSE:
+ newState = emitBit(sample, s, 0, STATE_MID0);
+ break;
+ case EVENT_SHORTPULSE:
+ newState = STATE_START1;
+ break;
+ }
+ break;
+ case STATE_MID0:
+ switch (event) {
+ case EVENT_LONGSPACE:
+ newState = emitBit(sample, s, 1, STATE_MID1);
+ break;
+ case EVENT_SHORTSPACE:
+ newState = STATE_START0;
+ break;
+ }
+ break;
+ case STATE_START1:
+ if (event == EVENT_SHORTSPACE)
+ newState = emitBit(sample, s, 1, STATE_MID1);
+ break;
+ case STATE_START0:
+ if (event == EVENT_SHORTPULSE)
+ newState = emitBit(sample, s, 0, STATE_MID0);
+ break;
+ }
+
+ if (newState == s->state)
+ s->state = STATE_INACTIVE;
+ else
+ s->state = newState;
+
+ if (s == &init)
+ bpf_map_update_elem(&decoder_state_map, &key, s, BPF_NOEXIST);
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/utils/keytable/bpf_protocols/pulse_distance.c b/utils/keytable/bpf_protocols/pulse_distance.c
new file mode 100644
index 00000000..a3d67dfd
--- /dev/null
+++ b/utils/keytable/bpf_protocols/pulse_distance.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (C) 2018 Sean Young <sean@xxxxxxxx>
+
+#include <linux/lirc.h>
+#include <linux/bpf.h>
+
+#include "bpf_helpers.h"
+
+enum state {
+ STATE_INACTIVE,
+ STATE_HEADER_SPACE,
+ STATE_BITS_SPACE,
+ STATE_BITS_PULSE,
+ STATE_TRAILER,
+};
+
+struct decoder_state {
+ unsigned int bits;
+ enum state state;
+ unsigned int count;
+};
+
+struct bpf_map_def SEC("maps") decoder_state_map = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(unsigned int),
+ .value_size = sizeof(struct decoder_state),
+ .max_entries = 1,
+};
+
+// These values can be overridden in the rc_keymap toml
+//
+// We abuse elf relocations. We cast the address of these variables to
+// an int, so that the compiler emits a mov immediate for the address
+// but uses it as an int. The bpf loader replaces the relocation with the
+// actual value (either overridden or taken from the data segment).
+int margin = 200;
+int header_pulse = 2125;
+int header_space = 1875;
+int bit_pulse = 625;
+int bit_0_space = 375;
+int bit_1_space = 1625;
+int trailer = 625;
+int bits = 4;
+int protocol = 64;
+
+#define BPF_PARAM(x) (int)(&(x))
+
+static inline int eq_margin(unsigned d1, unsigned d2)
+{
+ return ((d1 > (d2 - BPF_PARAM(margin))) && (d1 < (d2 + BPF_PARAM(margin))));
+}
+
+SEC("pulse_distance")
+int bpf_decoder(unsigned int *sample)
+{
+ unsigned int key = 0;
+ struct decoder_state *s = bpf_map_lookup_elem(&decoder_state_map, &key);
+ struct decoder_state init = {};
+
+ if (!s)
+ s = &init;
+
+ switch (*sample & LIRC_MODE2_MASK) {
+ case LIRC_MODE2_SPACE:
+ case LIRC_MODE2_PULSE:
+ case LIRC_MODE2_TIMEOUT:
+ break;
+ default:
+ // not a timing events
+ return 0;
+ }
+
+ int duration = LIRC_VALUE(*sample);
+
+ switch (s->state) {
+ case STATE_INACTIVE:
+ if (LIRC_IS_PULSE(*sample) && eq_margin(BPF_PARAM(header_pulse), duration)) {
+ s->bits = 0;
+ s->state = STATE_HEADER_SPACE;
+ s->count = 0;
+ }
+ break;
+ case STATE_HEADER_SPACE:
+ if (LIRC_IS_SPACE(*sample) && eq_margin(BPF_PARAM(header_space), duration))
+ s->state = STATE_BITS_PULSE;
+ else
+ s->state = STATE_INACTIVE;
+ break;
+ case STATE_BITS_PULSE:
+ if (LIRC_IS_PULSE(*sample) && eq_margin(BPF_PARAM(bit_pulse), duration)) {
+ s->state = STATE_BITS_SPACE;
+ } else {
+ s->state = STATE_INACTIVE;
+ }
+ break;
+ case STATE_BITS_SPACE:
+ if (!LIRC_IS_SPACE(*sample)) {
+ s->state = STATE_INACTIVE;
+ break;
+ }
+
+ s->bits <<= 1;
+
+ if (eq_margin(BPF_PARAM(bit_1_space), duration)) {
+ s->bits |= 1;
+ } else if (!eq_margin(BPF_PARAM(bit_0_space), duration)) {
+ s->state = STATE_INACTIVE;
+ break;
+ }
+
+ s->count++;
+ if (s->count == BPF_PARAM(bits)) {
+ s->state = STATE_TRAILER;
+ } else {
+ s->state = STATE_BITS_PULSE;
+ }
+ break;
+ case STATE_TRAILER:
+ if (LIRC_IS_PULSE(*sample) && eq_margin(BPF_PARAM(trailer), duration))
+ bpf_rc_keydown(sample, BPF_PARAM(protocol), s->bits, 0);
+
+ s->state = STATE_INACTIVE;
+ }
+
+ if (s == &init)
+ bpf_map_update_elem(&decoder_state_map, &key, s, BPF_NOEXIST);
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
+
diff --git a/utils/keytable/bpf_protocols/rc_mm.c b/utils/keytable/bpf_protocols/rc_mm.c
new file mode 100644
index 00000000..2f6aef3c
--- /dev/null
+++ b/utils/keytable/bpf_protocols/rc_mm.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (C) 2018 Sean Young <sean@xxxxxxxx>
+
+#include <linux/lirc.h>
+#include <linux/bpf.h>
+
+#include "bpf_helpers.h"
+
+enum state {
+ STATE_INACTIVE,
+ STATE_HEADER_SPACE,
+ STATE_BITS_SPACE,
+ STATE_BITS_PULSE,
+ STATE_TRAILER,
+};
+
+struct decoder_state {
+ unsigned int bits;
+ enum state state;
+ unsigned int count;
+};
+
+struct bpf_map_def SEC("maps") decoder_state_map = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(unsigned int),
+ .value_size = sizeof(struct decoder_state),
+ .max_entries = 1,
+};
+
+// These values can be overridden in the rc_keymap toml
+//
+// We abuse elf relocations. We cast the address of these variables to
+// an int, so that the compiler emits a mov immediate for the address
+// but uses it as an int. The bpf loader replaces the relocation with the
+// actual value (either overridden or taken from the data segment).
+//
+// This is why they should be accessed through the BPF_PARAM() macro.
+
+#define BPF_PARAM(x) (int)(&(x))
+
+int margin = 100;
+int header_pulse = 417;
+int header_space = 278;
+int bit_pulse = 167;
+int bit_0_space = 278;
+int bit_1_space = 444;
+int bit_2_space = 611;
+int bit_3_space = 778;
+int trailer = 167;
+int bits = 8;
+int protocol = 65;
+
+static inline int eq_margin(unsigned d1, unsigned d2)
+{
+ return ((d1 > (d2 - BPF_PARAM(margin))) && (d1 < (d2 + BPF_PARAM(margin))));
+}
+
+SEC("rc_mm")
+int bpf_decoder(unsigned int *sample)
+{
+ unsigned int key = 0;
+ struct decoder_state *s = bpf_map_lookup_elem(&decoder_state_map, &key);
+ struct decoder_state init = {};
+
+ if (!s)
+ s = &init;
+
+ switch (*sample & LIRC_MODE2_MASK) {
+ case LIRC_MODE2_SPACE:
+ case LIRC_MODE2_PULSE:
+ case LIRC_MODE2_TIMEOUT:
+ break;
+ default:
+ // not a timing events
+ return 0;
+ }
+
+ int duration = LIRC_VALUE(*sample);
+
+ switch (s->state) {
+ case STATE_INACTIVE:
+ if (LIRC_IS_PULSE(*sample) && eq_margin(BPF_PARAM(header_pulse), duration)) {
+ s->state = STATE_HEADER_SPACE;
+ s->bits = 0;
+ s->count = 0;
+ }
+ break;
+ case STATE_HEADER_SPACE:
+ if (LIRC_IS_SPACE(*sample) && eq_margin(BPF_PARAM(header_space), duration))
+ s->state = STATE_BITS_PULSE;
+ else
+ s->state = STATE_INACTIVE;
+ break;
+ case STATE_BITS_PULSE:
+ if (LIRC_IS_PULSE(*sample) && eq_margin(BPF_PARAM(bit_pulse), duration)) {
+ s->state = STATE_BITS_SPACE;
+ } else {
+ s->state = STATE_INACTIVE;
+ }
+ break;
+ case STATE_BITS_SPACE:
+ if (!LIRC_IS_SPACE(*sample)) {
+ s->state = STATE_INACTIVE;
+ break;
+ }
+
+ s->bits <<= 2;
+
+ if (eq_margin(BPF_PARAM(bit_0_space), duration)) {
+ s->bits |= 0;
+ } else if (eq_margin(BPF_PARAM(bit_1_space), duration)) {
+ s->bits |= 1;
+ } else if (eq_margin(BPF_PARAM(bit_2_space), duration)) {
+ s->bits |= 2;
+ } else if (eq_margin(BPF_PARAM(bit_3_space), duration)) {
+ s->bits |= 3;
+ } else {
+ s->state = STATE_INACTIVE;
+ break;
+ }
+
+ s->count += 2;
+ if (s->count >= BPF_PARAM(bits)) {
+ s->state = STATE_TRAILER;
+ } else {
+ s->state = STATE_BITS_PULSE;
+ }
+ break;
+ case STATE_TRAILER:
+ if (LIRC_IS_PULSE(*sample) && eq_margin(BPF_PARAM(trailer), duration))
+ bpf_rc_keydown(sample, BPF_PARAM(protocol), s->bits, 0);
+
+ s->state = STATE_INACTIVE;
+ }
+
+ if (s == &init)
+ bpf_map_update_elem(&decoder_state_map, &key, s, BPF_NOEXIST);
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
+
diff --git a/utils/keytable/rc_keymaps_bpf/RP75_LCD.toml b/utils/keytable/rc_keymaps_bpf/RP75_LCD.toml
new file mode 100644
index 00000000..53df49ea
--- /dev/null
+++ b/utils/keytable/rc_keymaps_bpf/RP75_LCD.toml
@@ -0,0 +1,45 @@
+name = "grundig"
+protocol = "grundig"
+[grundig]
+header_pulse = 1244
+[grundig.scancodes]
+0x01 = "KEY_1"
+0x02 = "KEY_2"
+0x03 = "KEY_3"
+0x04 = "KEY_4"
+0x05 = "KEY_5"
+0x06 = "KEY_6"
+0x07 = "KEY_7"
+0x08 = "KEY_8"
+0x09 = "KEY_9"
+0x31 = "KEY_0"
+0x16 = "KEY_DELETE"
+0x0a = "KEY_MODE"
+0x0c = "KEY_VOLUMEUP"
+0x18 = "KEY_VOLUMEDOWN"
+0x0b = "KEY_CHANNELUP"
+0x15 = "KEY_CHANNELDOWN"
+0x0d = "KEY_PAGEUP"
+0x13 = "KEY_PAGEDOWN"
+0x46 = "KEY_FASTFORWARD"
+0x43 = "KEY_REWIND"
+0x44 = "KEY_PLAYPAUSE"
+0x45 = "KEY_STOP"
+0x49 = "KEY_OK"
+0x47 = "KEY_UP"
+0x4b = "KEY_DOWN"
+0x48 = "KEY_LEFT"
+0x4a = "KEY_RIGHT"
+0x4d = "KEY_MENU"
+0x56 = "KEY_APPSELECT"
+0x4c = "KEY_BACK"
+0x1e = "KEY_INFO"
+0x4e = "KEY_F1"
+0x4f = "KEY_F2"
+0x50 = "KEY_F3"
+0x51 = "KEY_F4"
+0x1c = "KEY_AUDIO"
+0x12 = "KEY_MUTE"
+0x11 = "KEY_DOT"
+0x1d = "KEY_SETUP"
+0x40 = "KEY_POWER"
diff --git a/v4l-utils.spec.in b/v4l-utils.spec.in
index f7be08b3..e8203124 100644
--- a/v4l-utils.spec.in
+++ b/v4l-utils.spec.in
@@ -10,7 +10,7 @@ Source0: http://linuxtv.org/downloads/v4l-utils/v4l-utils-%{version}.tar.
Source1: qv4l2.desktop
Source2: qv4l2.svg
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
-BuildRequires: qt4-devel libsysfs-devel kernel-headers desktop-file-utils elfutils-libelf-devel
+BuildRequires: qt4-devel libsysfs-devel kernel-headers desktop-file-utils elfutils-libelf-devel clang
# For /etc/udev/rules.d ownership
Requires: udev
Requires: libv4l = %{version}-%{release}
--
2.17.1
