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176 lines
4.3 KiB
176 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// test ir decoder |
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// |
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// Copyright (C) 2018 Sean Young <[email protected]> |
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// A lirc chardev is a device representing a consumer IR (cir) device which |
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// can receive infrared signals from remote control and/or transmit IR. |
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// |
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// IR is sent as a series of pulses and space somewhat like morse code. The |
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// BPF program can decode this into scancodes so that rc-core can translate |
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// this into input key codes using the rc keymap. |
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// |
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// This test works by sending IR over rc-loopback, so the IR is processed by |
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// BPF and then decoded into scancodes. The lirc chardev must be the one |
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// associated with rc-loopback, see the output of ir-keytable(1). |
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// |
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// The following CONFIG options must be enabled for the test to succeed: |
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// CONFIG_RC_CORE=y |
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// CONFIG_BPF_RAWIR_EVENT=y |
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// CONFIG_RC_LOOPBACK=y |
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// Steps: |
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// 1. Open the /dev/lircN device for rc-loopback (given on command line) |
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// 2. Attach bpf_lirc_mode2 program which decodes some IR. |
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// 3. Send some IR to the same IR device; since it is loopback, this will |
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// end up in the bpf program |
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// 4. bpf program should decode IR and report keycode |
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// 5. We can read keycode from same /dev/lirc device |
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#include <linux/bpf.h> |
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#include <linux/lirc.h> |
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#include <linux/input.h> |
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#include <errno.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <poll.h> |
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#include <sys/types.h> |
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#include <sys/ioctl.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include "bpf_util.h" |
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#include <bpf/bpf.h> |
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#include <bpf/libbpf.h> |
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int main(int argc, char **argv) |
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{ |
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struct bpf_object *obj; |
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int ret, lircfd, progfd, inputfd; |
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int testir1 = 0x1dead; |
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int testir2 = 0x20101; |
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u32 prog_ids[10], prog_flags[10], prog_cnt; |
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if (argc != 3) { |
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printf("Usage: %s /dev/lircN /dev/input/eventM\n", argv[0]); |
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return 2; |
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} |
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ret = bpf_prog_load("test_lirc_mode2_kern.o", |
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BPF_PROG_TYPE_LIRC_MODE2, &obj, &progfd); |
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if (ret) { |
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printf("Failed to load bpf program\n"); |
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return 1; |
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} |
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lircfd = open(argv[1], O_RDWR | O_NONBLOCK); |
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if (lircfd == -1) { |
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printf("failed to open lirc device %s: %m\n", argv[1]); |
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return 1; |
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} |
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/* Let's try detach it before it was ever attached */ |
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ret = bpf_prog_detach2(progfd, lircfd, BPF_LIRC_MODE2); |
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if (ret != -1 || errno != ENOENT) { |
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printf("bpf_prog_detach2 not attached should fail: %m\n"); |
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return 1; |
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} |
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inputfd = open(argv[2], O_RDONLY | O_NONBLOCK); |
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if (inputfd == -1) { |
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printf("failed to open input device %s: %m\n", argv[1]); |
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return 1; |
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} |
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prog_cnt = 10; |
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ret = bpf_prog_query(lircfd, BPF_LIRC_MODE2, 0, prog_flags, prog_ids, |
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&prog_cnt); |
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if (ret) { |
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printf("Failed to query bpf programs on lirc device: %m\n"); |
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return 1; |
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} |
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if (prog_cnt != 0) { |
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printf("Expected nothing to be attached\n"); |
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return 1; |
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} |
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ret = bpf_prog_attach(progfd, lircfd, BPF_LIRC_MODE2, 0); |
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if (ret) { |
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printf("Failed to attach bpf to lirc device: %m\n"); |
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return 1; |
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} |
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/* Write raw IR */ |
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ret = write(lircfd, &testir1, sizeof(testir1)); |
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if (ret != sizeof(testir1)) { |
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printf("Failed to send test IR message: %m\n"); |
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return 1; |
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} |
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struct pollfd pfd = { .fd = inputfd, .events = POLLIN }; |
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struct input_event event; |
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for (;;) { |
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poll(&pfd, 1, 100); |
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/* Read decoded IR */ |
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ret = read(inputfd, &event, sizeof(event)); |
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if (ret != sizeof(event)) { |
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printf("Failed to read decoded IR: %m\n"); |
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return 1; |
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} |
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if (event.type == EV_MSC && event.code == MSC_SCAN && |
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event.value == 0xdead) { |
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break; |
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} |
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} |
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/* Write raw IR */ |
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ret = write(lircfd, &testir2, sizeof(testir2)); |
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if (ret != sizeof(testir2)) { |
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printf("Failed to send test IR message: %m\n"); |
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return 1; |
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} |
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for (;;) { |
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poll(&pfd, 1, 100); |
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/* Read decoded IR */ |
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ret = read(inputfd, &event, sizeof(event)); |
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if (ret != sizeof(event)) { |
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printf("Failed to read decoded IR: %m\n"); |
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return 1; |
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} |
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if (event.type == EV_REL && event.code == REL_Y && |
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event.value == 1 ) { |
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break; |
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} |
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} |
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prog_cnt = 10; |
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ret = bpf_prog_query(lircfd, BPF_LIRC_MODE2, 0, prog_flags, prog_ids, |
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&prog_cnt); |
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if (ret) { |
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printf("Failed to query bpf programs on lirc device: %m\n"); |
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return 1; |
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} |
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if (prog_cnt != 1) { |
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printf("Expected one program to be attached\n"); |
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return 1; |
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} |
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/* Let's try detaching it now it is actually attached */ |
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ret = bpf_prog_detach2(progfd, lircfd, BPF_LIRC_MODE2); |
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if (ret) { |
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printf("bpf_prog_detach2: returned %m\n"); |
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return 1; |
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} |
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return 0; |
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}
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