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-rw-r--r--utils/keytable/bpf_protocols/Makefile.am2
-rw-r--r--utils/keytable/bpf_protocols/xbox.c129
-rw-r--r--utils/keytable/rc_keymaps_userspace/xbox_dvd.toml31
3 files changed, 161 insertions, 1 deletions
diff --git a/utils/keytable/bpf_protocols/Makefile.am b/utils/keytable/bpf_protocols/Makefile.am
index ba79742c..1b90411b 100644
--- a/utils/keytable/bpf_protocols/Makefile.am
+++ b/utils/keytable/bpf_protocols/Makefile.am
@@ -10,7 +10,7 @@ CLANG_SYS_INCLUDES := $(shell $(CLANG) -v -E - </dev/null 2>&1 \
%.o: %.c bpf_helpers.h
$(CLANG) $(CLANG_SYS_INCLUDES) -D__linux__ -I$(top_srcdir)/include -target bpf -O2 -c $<
-PROTOCOLS = grundig.o pulse_distance.o pulse_length.o rc_mm.o manchester.o
+PROTOCOLS = grundig.o pulse_distance.o pulse_length.o rc_mm.o manchester.o xbox.o
all: $(PROTOCOLS)
diff --git a/utils/keytable/bpf_protocols/xbox.c b/utils/keytable/bpf_protocols/xbox.c
new file mode 100644
index 00000000..e48e0a79
--- /dev/null
+++ b/utils/keytable/bpf_protocols/xbox.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (C) 2018 Sean Young <sean@mess.org>
+
+#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 long 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 = 4000;
+int header_space = 3900;
+int bit_pulse = 550;
+int bit_0_space = 900;
+int bit_1_space = 1900;
+int trailer_pulse = 550;
+int bits = 24;
+int rc_protocol = 68;
+
+#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("xbox")
+int bpf_decoder(unsigned int *sample)
+{
+ unsigned int key = 0;
+ struct decoder_state *s = bpf_map_lookup_elem(&decoder_state_map, &key);
+
+ if (!s)
+ return 0;
+
+ 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);
+ int pulse = LIRC_IS_PULSE(*sample);
+
+ switch (s->state) {
+ case STATE_HEADER_SPACE:
+ if (!pulse && eq_margin(BPF_PARAM(header_space), duration))
+ s->state = STATE_BITS_PULSE;
+ else
+ s->state = STATE_INACTIVE;
+ break;
+ case STATE_INACTIVE:
+ if (pulse && eq_margin(BPF_PARAM(header_pulse), duration)) {
+ s->bits = 0;
+ s->state = STATE_HEADER_SPACE;
+ s->count = 0;
+ }
+ break;
+ case STATE_BITS_PULSE:
+ if (pulse && eq_margin(BPF_PARAM(bit_pulse), duration))
+ s->state = STATE_BITS_SPACE;
+ else
+ s->state = STATE_INACTIVE;
+ break;
+ case STATE_BITS_SPACE:
+ if (pulse) {
+ 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 (pulse && eq_margin(BPF_PARAM(trailer_pulse), duration)) {
+ if (((s->bits >> 12) ^ (s->bits & 0xfff)) == 0xfff)
+ bpf_rc_keydown(sample, BPF_PARAM(rc_protocol), s->bits & 0xfff, 0);
+ }
+
+ s->state = STATE_INACTIVE;
+ }
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/utils/keytable/rc_keymaps_userspace/xbox_dvd.toml b/utils/keytable/rc_keymaps_userspace/xbox_dvd.toml
new file mode 100644
index 00000000..77863542
--- /dev/null
+++ b/utils/keytable/rc_keymaps_userspace/xbox_dvd.toml
@@ -0,0 +1,31 @@
+[[protocols]]
+name = "XBox DVD"
+protocol = "xbox"
+[protocols.scancodes]
+0xa0b = "KEY_OK"
+0xaa6 = "KEY_UP"
+0xaa7 = "KEY_DOWN"
+0xaa8 = "KEY_RIGHT"
+0xaa9 = "KEY_LEFT"
+0xac3 = "KEY_INFO"
+0xac6 = "KEY_9"
+0xac7 = "KEY_8"
+0xac8 = "KEY_7"
+0xac9 = "KEY_6"
+0xaca = "KEY_5"
+0xacb = "KEY_4"
+0xacc = "KEY_3"
+0xacd = "KEY_2"
+0xace = "KEY_1"
+0xacf = "KEY_0"
+0xad5 = "KEY_ANGLE"
+0xad8 = "KEY_BACK"
+0xadd = "KEY_PREVIOUSSONG"
+0xadf = "KEY_NEXTSONG"
+0xae0 = "KEY_STOP"
+0xae2 = "KEY_REWIND"
+0xae3 = "KEY_FASTFORWARD"
+0xae5 = "KEY_TITLE"
+0xae6 = "KEY_PAUSE"
+0xaea = "KEY_PLAY"
+0xaf7 = "KEY_MENU"

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