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Subject: keytable: add bpf protocols Author: Sean Young <s...@mess.org> Date: Thu May 24 13:30:08 2018 +0100 Add a few BPF protocols and infrastructure for building them. Signed-off-by: Sean Young <s...@mess.org> configure.ac | 4 + utils/keytable/Makefile.am | 4 + utils/keytable/bpf_protocols/Makefile.am | 21 ++ utils/keytable/bpf_protocols/bpf_helpers.h | 315 ++++++++++++++++++++++++++ utils/keytable/bpf_protocols/grundig.c | 126 +++++++++++ utils/keytable/bpf_protocols/manchester.c | 171 ++++++++++++++ utils/keytable/bpf_protocols/pulse_distance.c | 156 +++++++++++++ utils/keytable/bpf_protocols/pulse_length.c | 152 +++++++++++++ utils/keytable/bpf_protocols/rc_mm.c | 139 ++++++++++++ v4l-utils.spec.in | 2 +- 10 files changed, 1089 insertions(+), 1 deletion(-) --- http://git.linuxtv.org/cgit.cgi/v4l-utils.git/commit/?id=91b37c0d9cb71fc2d5f78cc96aa2ef9f3bba145b diff --git a/configure.ac b/configure.ac index 08f5a4c5bf14..10f8628bda3e 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 ad25191554c9..b500e2f26217 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 000000000000..5e4b3d678cab --- /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 pulse_length.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)$(keytablesystemdir)/protocols" diff --git a/utils/keytable/bpf_protocols/bpf_helpers.h b/utils/keytable/bpf_protocols/bpf_helpers.h new file mode 100644 index 000000000000..8c1b8a23ab98 --- /dev/null +++ b/utils/keytable/bpf_protocols/bpf_helpers.h @@ -0,0 +1,315 @@ +/* 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_lwt_push_encap)(void *ctx, unsigned int type, void *hdr, + unsigned int len) = +(void *) BPF_FUNC_lwt_push_encap; +static int (*bpf_lwt_seg6_store_bytes)(void *ctx, unsigned int offset, + void *from, unsigned int len) = +(void *) BPF_FUNC_lwt_seg6_store_bytes; +static int (*bpf_lwt_seg6_action)(void *ctx, unsigned int action, void *param, + unsigned int param_len) = +(void *) BPF_FUNC_lwt_seg6_action; +static int (*bpf_lwt_seg6_adjust_srh)(void *ctx, unsigned int offset, + unsigned int len) = +(void *) BPF_FUNC_lwt_seg6_adjust_srh; +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; +static unsigned long long (*bpf_get_current_cgroup_id)(void) = +(void *) BPF_FUNC_get_current_cgroup_id; + +/* 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 000000000000..4d8cc4b92a23 --- /dev/null +++ b/utils/keytable/bpf_protocols/grundig.c @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright (C) 2018 Sean Young <s...@mess.org> + +#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); + + 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); + + 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; + } + } + } + + 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 000000000000..94b53fd055b9 --- /dev/null +++ b/utils/keytable/bpf_protocols/manchester.c @@ -0,0 +1,171 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright (C) 2018 Sean Young <s...@mess.org> + +#include <linux/lirc.h> +#include <linux/bpf.h> + +#include "bpf_helpers.h" + +struct decoder_state { + unsigned int state; + unsigned int count; + unsigned long bits; +}; + +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 +int margin = 200; +int header_pulse = 0; +int header_space = 0; +int zero_pulse = 888; +int zero_space = 888; +int one_pulse = 888; +int one_space = 888; +int toggle_bit = 100; +int bits = 14; +int scancode_mask = 0; +int rc_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 + +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; + unsigned long mask = BPF_PARAM(scancode_mask); + if (BPF_PARAM(toggle_bit) < BPF_PARAM(bits)) { + unsigned int tmask = 1 << BPF_PARAM(toggle_bit); + if (s->bits & tmask) + toggle = 1; + mask |= tmask; + } + + bpf_rc_keydown(sample, BPF_PARAM(rc_protocol), s->bits & ~mask, + 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); + 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); + + unsigned int newState = s->state; + + switch (s->state) { + case STATE_INACTIVE: + if (BPF_PARAM(header_pulse)) { + if (pulse && + eq_margin(BPF_PARAM(header_pulse), duration)) { + s->state = STATE_HEADER; + } + break; + } + /* pass through */ + case STATE_HEADER: + if (BPF_PARAM(header_space)) { + if (!pulse && + eq_margin(BPF_PARAM(header_space), duration)) { + s->state = STATE_MID1; + } + break; + } + s->bits = 0; + s->count = 0; + /* pass through */ + case STATE_MID1: + if (!pulse) + break; + + if (eq_margin(BPF_PARAM(one_pulse), duration)) + newState = emitBit(sample, s, 1, STATE_START1); + else if (eq_margin(BPF_PARAM(one_pulse) + + BPF_PARAM(zero_pulse), duration)) + newState = emitBit(sample, s, 1, STATE_MID0); + break; + case STATE_MID0: + if (pulse) + break; + + if (eq_margin(BPF_PARAM(zero_space), duration)) + newState = emitBit(sample, s, 0, STATE_START0); + else if (eq_margin(BPF_PARAM(zero_space) + + BPF_PARAM(one_space), duration)) + newState = emitBit(sample, s, 0, STATE_MID1); + else + newState = emitBit(sample, s, 0, STATE_INACTIVE); + break; + case STATE_START1: + if (!pulse && eq_margin(BPF_PARAM(zero_space), duration)) + newState = STATE_MID1; + break; + case STATE_START0: + if (pulse && eq_margin(BPF_PARAM(one_pulse), duration)) + newState = STATE_MID0; + break; + } + + //char fmt1[] = "bits:%d state:%d newState:%d\n"; + //bpf_trace_printk(fmt1, sizeof(fmt1), pulse, duration, s->bits); + //char fmt2[] = "count:%d state:%d newState:%d\n"; + //bpf_trace_printk(fmt2, sizeof(fmt2), s->count, s->state, newState); + + if (newState == s->state) + s->state = STATE_INACTIVE; + else + s->state = newState; + + 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 000000000000..9e9ea4ad935e --- /dev/null +++ b/utils/keytable/bpf_protocols/pulse_distance.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright (C) 2018 Sean Young <s...@mess.org> + +#include <linux/lirc.h> +#include <linux/bpf.h> + +#include "bpf_helpers.h" + +enum state { + STATE_INACTIVE, + STATE_HEADER_SPACE, + STATE_REPEAT_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 = 2125; +int header_space = 1875; +int repeat_pulse = 0; +int repeat_space = 0; +int bit_pulse = 625; +int bit_0_space = 375; +int bit_1_space = 1625; +int trailer_pulse = 625; +int bits = 4; +int reverse = 0; +int header_optional = 0; +int rc_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); + + 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_REPEAT_SPACE: + if (!pulse && eq_margin(BPF_PARAM(repeat_space), duration)) + s->state = STATE_TRAILER; + 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; + } + if (pulse && BPF_PARAM(repeat_pulse) > 0 && + eq_margin(BPF_PARAM(repeat_pulse), duration)) { + s->state = STATE_REPEAT_SPACE; + s->count = 0; + break; + } + if (!BPF_PARAM(header_optional)) + break; + /* pass through */ + 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; + } + + unsigned long set_bit = 1; + + if (BPF_PARAM(reverse)) + set_bit <<= s->count; + else + s->bits <<= 1; + + if (eq_margin(BPF_PARAM(bit_1_space), duration)) + s->bits |= set_bit; + 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->count == 0) + bpf_rc_repeat(sample); + else + bpf_rc_keydown(sample, BPF_PARAM(rc_protocol), s->bits, 0); + } + + s->state = STATE_INACTIVE; + } + + return 0; +} + +char _license[] SEC("license") = "GPL"; diff --git a/utils/keytable/bpf_protocols/pulse_length.c b/utils/keytable/bpf_protocols/pulse_length.c new file mode 100644 index 000000000000..e33f08993f68 --- /dev/null +++ b/utils/keytable/bpf_protocols/pulse_length.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright (C) 2018 Sean Young <s...@mess.org> + +#include <linux/lirc.h> +#include <linux/bpf.h> + +#include "bpf_helpers.h" + +enum state { + STATE_INACTIVE, + STATE_HEADER_SPACE, + STATE_REPEAT_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 = 2125; +int header_space = 1875; +int repeat_pulse = 0; +int repeat_space = 0; +int bit_space = 625; +int bit_0_pulse = 375; +int bit_1_pulse = 1625; +int trailer_pulse = 0; +int bits = 4; +int reverse = 0; +int header_optional = 0; +int rc_protocol = 67; + +#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_length") +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_REPEAT_SPACE: + if (!pulse && eq_margin(BPF_PARAM(repeat_space), duration)) + s->state = STATE_TRAILER; + 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; + } + if (pulse && BPF_PARAM(repeat_pulse) > 0 && + eq_margin(BPF_PARAM(repeat_pulse), duration)) { + s->state = STATE_REPEAT_SPACE; + s->count = 0; + break; + } + if (!BPF_PARAM(header_optional)) + break; + /* pass through */ + case STATE_BITS_PULSE: + if (!pulse) + break; + + unsigned long set_bit = 1; + + if (BPF_PARAM(reverse)) + set_bit <<= s->count; + else + s->bits <<= 1; + + if (eq_margin(BPF_PARAM(bit_1_pulse), duration)) + s->bits |= set_bit; + else if (!eq_margin(BPF_PARAM(bit_0_pulse), duration)) { + s->state = STATE_INACTIVE; + break; + } + + s->count++; + if (s->count == BPF_PARAM(bits)) { + bpf_rc_keydown(sample, BPF_PARAM(rc_protocol), s->bits, 0); + s->state = STATE_INACTIVE; + } else { + s->state = STATE_BITS_SPACE; + } + break; + case STATE_BITS_SPACE: + if (!pulse && eq_margin(BPF_PARAM(bit_space), duration)) + s->state = STATE_BITS_PULSE; + else + s->state = STATE_INACTIVE; + break; + case STATE_TRAILER: + if (pulse && eq_margin(BPF_PARAM(trailer_pulse), duration)) + bpf_rc_repeat(sample); + + s->state = STATE_INACTIVE; + } + + 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 000000000000..034d39b9e99e --- /dev/null +++ b/utils/keytable/bpf_protocols/rc_mm.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright (C) 2018 Sean Young <s...@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 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 rc_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); + 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); + + 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(rc_protocol), s->bits, 0); + + s->state = STATE_INACTIVE; + } + + return 0; +} + +char _license[] SEC("license") = "GPL"; + diff --git a/v4l-utils.spec.in b/v4l-utils.spec.in index f7be08b3eb8f..e8203124d891 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} _______________________________________________ linuxtv-commits mailing list linuxtv-commits@linuxtv.org https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
