apple-ir-control.cc

   1 #include <CoreFoundation/CoreFoundation.h>
   2 #include <IOKit/hid/IOHIDLib.h>
   3 #include <IOKit/IOKitLib.h>
   4 #include <unistd.h>
   5 #include <vector>
   6
   7 const CFStringRef kPrefDomain = CFSTR("com.apple.driver.AppleIRController");
   8 const CFStringRef kPrefEnabled = CFSTR("DeviceEnabled");
   9
  10 bool VERBOSE = true;
  11
  12 #define LOG(msg, ...) do { \
  13     if (VERBOSE) { \
  14       printf(msg "   [%s:%d]\n", ##__VA_ARGS__, __FILE__, __LINE__); \
  15     } \
  16   } while(0)
  17 #define ERROR(msg, ...) fprintf(stderr, msg "   [%s:%d]\n", ##__VA_ARGS__, __FILE__, __LINE__)
  18
  19 class ScopedIOHIDManager {
  20  public:
  21   ScopedIOHIDManager()
  22       : manager_(IOHIDManagerCreate(nullptr, kIOHIDManagerOptionNone)) {}
  23
  24   ~ScopedIOHIDManager() {
  25     IOHIDManagerClose(manager_, kIOHIDManagerOptionNone);
  26   }
  27
  28   ScopedIOHIDManager(const ScopedIOHIDManager&) = delete;
  29
  30   IOHIDManagerRef get() { return manager_; }
  31
  32  private:
  33   IOHIDManagerRef manager_;
  34 };
  35
  36 template <typename T>
  37 class ScopedCFTypeRef {
  38  public:
  39   ScopedCFTypeRef(T t = nullptr) : t_(t) {}
  40   ~ScopedCFTypeRef() {
  41     if (t_) {
  42       CFRelease(t_);
  43     }
  44   }
  45
  46   ScopedCFTypeRef(const ScopedCFTypeRef<T>&) = delete;
  47
  48   operator bool() { return t_ != nullptr; }
  49
  50   T get() { return t_; }
  51
  52   T* pointer_to() { return &t_; }
  53
  54  private:
  55   T t_;
  56 };
  57
  58 bool IsIRAvailable() {
  59   ScopedIOHIDManager manager;
  60   IOHIDManagerSetDeviceMatching(manager.get(), nullptr);
  61   ScopedCFTypeRef<CFSetRef> devices(IOHIDManagerCopyDevices(manager.get()));
  62   if (!devices) {
  63     ERROR("Failed to IOHIDManagerCopyDevices");
  64     return false;
  65   }
  66   std::vector<void*> devices_array(CFSetGetCount(devices.get()), nullptr);
  67   CFSetGetValues(devices.get(), const_cast<const void**>(devices_array.data()));
  68   for (const auto& device : devices_array) {
  69     CFTypeRef prop =
  70         IOHIDDeviceGetProperty(reinterpret_cast<IOHIDDeviceRef>(device),
  71                                CFSTR("HIDRemoteControl"));
  72     if (prop) {
  73       if (VERBOSE) {
  74         LOG("Located HIDRemoteControl:");
  75         CFShow(device);
  76       }
  77       return true;
  78     }
  79   }
  80   return false;
  81 }
  82
  83 const char* GetBooleanDescription(CFTypeRef boolean) {
  84   if (CFGetTypeID(boolean) != CFBooleanGetTypeID()) {
  85     ERROR("Unexpected non-boolean CFTypeRef");
  86     abort();
  87   }
  88   return CFBooleanGetValue(static_cast<CFBooleanRef>(boolean)) ? "on" : "off";
  89 }
  90
  91 CFTypeRef GetUserPropertyValue() {
  92   return CFPreferencesCopyValue(kPrefEnabled, kPrefDomain,
  93       kCFPreferencesAnyUser, kCFPreferencesCurrentHost);
  94 }
  95
  96 io_iterator_t CreateIOServiceIterator() {
  97   CFMutableDictionaryRef matching_dict = IOServiceMatching("AppleIRController");
  98   io_iterator_t iterator;
  99   kern_return_t kr = IOServiceGetMatchingServices(kIOMasterPortDefault, matching_dict, &iterator);
 100   if (kr != KERN_SUCCESS) {
 101     ERROR("Failed to IOServiceGetMatchingServices: 0x%x", kr);
 102     return 0;
 103   }
 104   return iterator;
 105 }
 106
 107 int HandleRead() {
 108   CFTypeRef user_prop = GetUserPropertyValue();
 109   printf("Userspace property value: %s\n", GetBooleanDescription(user_prop));
 110
 111   io_iterator_t iterator = CreateIOServiceIterator();
 112   if (!iterator)
 113     return EXIT_FAILURE;
 114
 115   io_object_t service;
 116   bool did_find = false;
 117   while ((service = IOIteratorNext(iterator))) {
 118     did_find = true;
 119
 120     io_name_t name;
 121     kern_return_t kr = IORegistryEntryGetName(service, name);
 122     if (kr != KERN_SUCCESS) {
 123       ERROR("Failed to IORegistryEntryGetName: 0x%x", kr);
 124       continue;
 125     }
 126
 127     LOG("Found AppleIRController: %s", name);
 128
 129     ScopedCFTypeRef<CFTypeRef> device_enabled(
 130         IORegistryEntryCreateCFProperty(service, kPrefEnabled, nullptr, 0));
 131     printf("Kernel property value %s: %s\n",
 132         name, GetBooleanDescription(device_enabled.get()));
 133
 134 #if 0
 135     ScopedCFTypeRef<CFMutableDictionaryRef> props;
 136     kr = IORegistryEntryCreateCFProperties(service, props.pointer_to(), nullptr, 0);
 137     if (kr != KERN_SUCCESS) {
 138       ERROR("Failed to IORegistryEntryCreateCFProperties(%s) = 0x%x", name, kr);
 139       continue;
 140     }
 141     CFShow(props.get());
 142 #endif
 143   }
 144
 145   if (!did_find) {
 146     ERROR("Failed to match AppleIRController");
 147     return EXIT_FAILURE;
 148   }
 149
 150   return EXIT_SUCCESS;
 151 }
 152
 153 int HandleWrite(bool enable) {
 154   return EXIT_SUCCESS;
 155 }
 156
 157 int main(int argc, char* argv[]) {
 158   if (!IsIRAvailable()) {
 159     ERROR("No HIDRemoteControl available");
 160     return EXIT_FAILURE;
 161   }
 162
 163   if (argc == 1) {
 164     return HandleRead();
 165   } else if (argc == 2) {
 166     if (strcmp("on", argv[1])) {
 167       return HandleWrite(true);
 168     } else if (strcmp("off", argv[1])) {
 169       return HandleWrite(false);
 170     }
 171   }
 172
 173   fprintf(stderr, "Usage: %s [on|off]\n", argv[0]);
 174   return EXIT_FAILURE;
 175 }