123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149 |
- // SPDX-License-Identifier: GPL-2.0
- // test ir decoder
- //
- // Copyright (C) 2018 Sean Young <sean@mess.org>
- // A lirc chardev is a device representing a consumer IR (cir) device which
- // can receive infrared signals from remote control and/or transmit IR.
- //
- // IR is sent as a series of pulses and space somewhat like morse code. The
- // BPF program can decode this into scancodes so that rc-core can translate
- // this into input key codes using the rc keymap.
- //
- // This test works by sending IR over rc-loopback, so the IR is processed by
- // BPF and then decoded into scancodes. The lirc chardev must be the one
- // associated with rc-loopback, see the output of ir-keytable(1).
- //
- // The following CONFIG options must be enabled for the test to succeed:
- // CONFIG_RC_CORE=y
- // CONFIG_BPF_RAWIR_EVENT=y
- // CONFIG_RC_LOOPBACK=y
- // Steps:
- // 1. Open the /dev/lircN device for rc-loopback (given on command line)
- // 2. Attach bpf_lirc_mode2 program which decodes some IR.
- // 3. Send some IR to the same IR device; since it is loopback, this will
- // end up in the bpf program
- // 4. bpf program should decode IR and report keycode
- // 5. We can read keycode from same /dev/lirc device
- #include <linux/bpf.h>
- #include <linux/lirc.h>
- #include <errno.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <poll.h>
- #include <sys/types.h>
- #include <sys/ioctl.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include "bpf_util.h"
- #include <bpf/bpf.h>
- #include <bpf/libbpf.h>
- int main(int argc, char **argv)
- {
- struct bpf_object *obj;
- int ret, lircfd, progfd, mode;
- int testir = 0x1dead;
- u32 prog_ids[10], prog_flags[10], prog_cnt;
- if (argc != 2) {
- printf("Usage: %s /dev/lircN\n", argv[0]);
- return 2;
- }
- ret = bpf_prog_load("test_lirc_mode2_kern.o",
- BPF_PROG_TYPE_LIRC_MODE2, &obj, &progfd);
- if (ret) {
- printf("Failed to load bpf program\n");
- return 1;
- }
- lircfd = open(argv[1], O_RDWR | O_NONBLOCK);
- if (lircfd == -1) {
- printf("failed to open lirc device %s: %m\n", argv[1]);
- return 1;
- }
- /* Let's try detach it before it was ever attached */
- ret = bpf_prog_detach2(progfd, lircfd, BPF_LIRC_MODE2);
- if (ret != -1 || errno != ENOENT) {
- printf("bpf_prog_detach2 not attached should fail: %m\n");
- return 1;
- }
- mode = LIRC_MODE_SCANCODE;
- if (ioctl(lircfd, LIRC_SET_REC_MODE, &mode)) {
- printf("failed to set rec mode: %m\n");
- return 1;
- }
- prog_cnt = 10;
- ret = bpf_prog_query(lircfd, BPF_LIRC_MODE2, 0, prog_flags, prog_ids,
- &prog_cnt);
- if (ret) {
- printf("Failed to query bpf programs on lirc device: %m\n");
- return 1;
- }
- if (prog_cnt != 0) {
- printf("Expected nothing to be attached\n");
- return 1;
- }
- ret = bpf_prog_attach(progfd, lircfd, BPF_LIRC_MODE2, 0);
- if (ret) {
- printf("Failed to attach bpf to lirc device: %m\n");
- return 1;
- }
- /* Write raw IR */
- ret = write(lircfd, &testir, sizeof(testir));
- if (ret != sizeof(testir)) {
- printf("Failed to send test IR message: %m\n");
- return 1;
- }
- struct pollfd pfd = { .fd = lircfd, .events = POLLIN };
- struct lirc_scancode lsc;
- poll(&pfd, 1, 100);
- /* Read decoded IR */
- ret = read(lircfd, &lsc, sizeof(lsc));
- if (ret != sizeof(lsc)) {
- printf("Failed to read decoded IR: %m\n");
- return 1;
- }
- if (lsc.scancode != 0xdead || lsc.rc_proto != 64) {
- printf("Incorrect scancode decoded\n");
- return 1;
- }
- prog_cnt = 10;
- ret = bpf_prog_query(lircfd, BPF_LIRC_MODE2, 0, prog_flags, prog_ids,
- &prog_cnt);
- if (ret) {
- printf("Failed to query bpf programs on lirc device: %m\n");
- return 1;
- }
- if (prog_cnt != 1) {
- printf("Expected one program to be attached\n");
- return 1;
- }
- /* Let's try detaching it now it is actually attached */
- ret = bpf_prog_detach2(progfd, lircfd, BPF_LIRC_MODE2);
- if (ret) {
- printf("bpf_prog_detach2: returned %m\n");
- return 1;
- }
- return 0;
- }
|