1 /** 2 * Copyright 2017 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <cstdint> 18 #include <cstdio> 19 #include <experimental/filesystem> 20 #include <lpcsnoop/snoop_listen.hpp> 21 #include <string> 22 23 static const char* device_node_path; 24 25 namespace fs = std::experimental::filesystem; 26 27 static void DisplayDbusValue(postcode_t postcodes) 28 { 29 auto postcode = std::get<primary_post_code_t>(postcodes); 30 // Uses cstdio instead of streams because the device file has 31 // very strict requirements about the data format and streaming 32 // abstractions tend to muck it up. 33 FILE* f = std::fopen(device_node_path, "r+"); 34 if (f) 35 { 36 int rc = std::fprintf(f, "%d%02x\n", (postcode > 0xff), 37 static_cast<uint8_t>(postcode & 0xff)); 38 if (rc < 0) 39 { 40 std::fprintf(stderr, "failed to write 7seg value: rc=%d\n", rc); 41 } 42 std::fflush(f); 43 std::fclose(f); 44 } 45 } 46 47 /* 48 * This is the entry point for the application. 49 * 50 * This application simply creates an object that registers for incoming value 51 * updates for the POST code dbus object. 52 */ 53 int main(int argc, const char* argv[]) 54 { 55 if (argc != 2 || !fs::exists(argv[1])) 56 { 57 std::fprintf(stderr, "usage: %s <device_node>\n", argv[0]); 58 return -1; 59 } 60 61 device_node_path = argv[1]; 62 63 auto ListenBus = sdbusplus::bus::new_default(); 64 std::unique_ptr<lpcsnoop::SnoopListen> snoop = 65 std::make_unique<lpcsnoop::SnoopListen>(ListenBus, DisplayDbusValue); 66 67 while (true) 68 { 69 ListenBus.process_discard(); 70 ListenBus.wait(); 71 } 72 73 return 0; 74 } 75