src/device/hid/hid_connection_mac.cc

   1 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "device/hid/hid_connection_mac.h"
   6
   7 #include "base/bind.h"
   8 #include "base/mac/foundation_util.h"
   9 #include "base/message_loop/message_loop.h"
  10 #include "device/hid/hid_connection_mac.h"
  11
  12 namespace device {
  13
  14 HidConnectionMac::HidConnectionMac(HidDeviceInfo device_info)
  15     : HidConnection(device_info),
  16       device_(device_info.device_id, base::scoped_policy::RETAIN) {
  17   message_loop_ = base::MessageLoopProxy::current();
  18
  19   DCHECK(device_.get());
  20
  21   size_t expected_report_size = device_info.max_input_report_size;
  22   if (device_info.has_report_id) {
  23     expected_report_size++;
  24   }
  25   inbound_buffer_.resize(expected_report_size);
  26   if (inbound_buffer_.size() > 0) {
  27     IOHIDDeviceRegisterInputReportCallback(
  28         device_.get(),
  29         &inbound_buffer_[0],
  30         inbound_buffer_.size(),
  31         &HidConnectionMac::InputReportCallback,
  32         this);
  33   }
  34 }
  35
  36 HidConnectionMac::~HidConnectionMac() {
  37   if (inbound_buffer_.size() > 0) {
  38     // Unregister the input report callback before this object is freed.
  39     IOHIDDeviceRegisterInputReportCallback(
  40         device_.get(), &inbound_buffer_[0], inbound_buffer_.size(), NULL, this);
  41   }
  42   Flush();
  43 }
  44
  45 void HidConnectionMac::PlatformRead(const ReadCallback& callback) {
  46   if (!device_) {
  47     callback.Run(false, NULL, 0);
  48     return;
  49   }
  50
  51   PendingHidRead pending_read;
  52   pending_read.callback = callback;
  53   pending_reads_.push(pending_read);
  54   ProcessReadQueue();
  55 }
  56
  57 void HidConnectionMac::PlatformWrite(scoped_refptr<net::IOBuffer> buffer,
  58                                      size_t size,
  59                                      const WriteCallback& callback) {
  60   WriteReport(kIOHIDReportTypeOutput, buffer, size, callback);
  61 }
  62
  63 void HidConnectionMac::PlatformGetFeatureReport(uint8_t report_id,
  64                                                 const ReadCallback& callback) {
  65   if (!device_) {
  66     callback.Run(false, NULL, 0);
  67     return;
  68   }
  69
  70   scoped_refptr<net::IOBufferWithSize> buffer(
  71       new net::IOBufferWithSize(device_info().max_feature_report_size));
  72   CFIndex report_size = buffer->size();
  73   IOReturn result =
  74       IOHIDDeviceGetReport(device_,
  75                            kIOHIDReportTypeFeature,
  76                            report_id,
  77                            reinterpret_cast<uint8_t*>(buffer->data()),
  78                            &report_size);
  79   if (result == kIOReturnSuccess) {
  80     callback.Run(true, buffer, report_size);
  81   } else {
  82     VLOG(1) << "Failed to get feature report: " << result;
  83     callback.Run(false, NULL, 0);
  84   }
  85 }
  86
  87 void HidConnectionMac::PlatformSendFeatureReport(
  88     scoped_refptr<net::IOBuffer> buffer,
  89     size_t size,
  90     const WriteCallback& callback) {
  91   WriteReport(kIOHIDReportTypeFeature, buffer, size, callback);
  92 }
  93
  94 void HidConnectionMac::InputReportCallback(void* context,
  95                                            IOReturn result,
  96                                            void* sender,
  97                                            IOHIDReportType type,
  98                                            uint32_t report_id,
  99                                            uint8_t* report_bytes,
 100                                            CFIndex report_length) {
 101   if (result != kIOReturnSuccess) {
 102     VLOG(1) << "Failed to read input report: " << result;
 103     return;
 104   }
 105
 106   HidConnectionMac* connection = static_cast<HidConnectionMac*>(context);
 107   scoped_refptr<net::IOBufferWithSize> buffer;
 108   if (connection->device_info().has_report_id) {
 109     // report_id is already contained in report_bytes
 110     buffer = new net::IOBufferWithSize(report_length);
 111     memcpy(buffer->data(), report_bytes, report_length);
 112   } else {
 113     buffer = new net::IOBufferWithSize(report_length + 1);
 114     buffer->data()[0] = 0;
 115     memcpy(buffer->data() + 1, report_bytes, report_length);
 116   }
 117
 118   connection->message_loop_->PostTask(
 119       FROM_HERE,
 120       base::Bind(&HidConnectionMac::ProcessInputReport, connection, buffer));
 121 }
 122
 123 void HidConnectionMac::WriteReport(IOHIDReportType type,
 124                                    scoped_refptr<net::IOBuffer> buffer,
 125                                    size_t size,
 126                                    const WriteCallback& callback) {
 127   if (!device_) {
 128     callback.Run(false);
 129     return;
 130   }
 131
 132   uint8_t* data = reinterpret_cast<uint8_t*>(buffer->data());
 133   DCHECK(size >= 1);
 134   uint8_t report_id = data[0];
 135   if (report_id == 0) {
 136     // OS X only expects the first byte of the buffer to be the report ID if the
 137     // report ID is non-zero.
 138     ++data;
 139     --size;
 140   }
 141
 142   IOReturn res =
 143       IOHIDDeviceSetReport(device_.get(), type, report_id, data, size);
 144   if (res == kIOReturnSuccess) {
 145     callback.Run(true);
 146   } else {
 147     VLOG(1) << "Failed to set report: " << res;
 148     callback.Run(false);
 149   }
 150 }
 151
 152 void HidConnectionMac::Flush() {
 153   while (!pending_reads_.empty()) {
 154     pending_reads_.front().callback.Run(false, NULL, 0);
 155     pending_reads_.pop();
 156   }
 157 }
 158
 159 void HidConnectionMac::ProcessInputReport(
 160     scoped_refptr<net::IOBufferWithSize> buffer) {
 161   DCHECK(thread_checker().CalledOnValidThread());
 162   PendingHidReport report;
 163   report.buffer = buffer;
 164   report.size = buffer->size();
 165   pending_reports_.push(report);
 166   ProcessReadQueue();
 167 }
 168
 169 void HidConnectionMac::ProcessReadQueue() {
 170   DCHECK(thread_checker().CalledOnValidThread());
 171   while (pending_reads_.size() && pending_reports_.size()) {
 172     PendingHidRead read = pending_reads_.front();
 173     PendingHidReport report = pending_reports_.front();
 174
 175     pending_reports_.pop();
 176     if (CompleteRead(report.buffer, report.size, read.callback)) {
 177       pending_reads_.pop();
 178     }
 179   }
 180 }
 181
 182 }  // namespace device