Adding {Claim,Release}Interface to UsbDevice.

BUG=153567


Review URL: https://chromiumcodereview.appspot.com/11032021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@159759 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 24 insertions, 0 deletions

diff --git a/chrome/browser/usb/usb_device.cc b/chrome/browser/usb/usb_device.cc
index 8cb72db..8b6a135 100644
--- a/chrome/browser/usb/usb_device.cc
+++ b/chrome/browser/usb/usb_device.cc
@@ -150,6 +150,23 @@ void UsbDevice::TransferComplete(PlatformUsbTransferHandle handle) {
   libusb_free_transfer(handle);
 }
 
+void UsbDevice::ClaimInterface(const int interface_number,
+                               const UsbInterfaceCallback& callback) {
+  CheckDevice();
+
+  const int claim_result = libusb_claim_interface(handle_, interface_number);
+  callback.Run(claim_result == 0);
+}
+
+void UsbDevice::ReleaseInterface(const int interface_number,
+                                 const UsbInterfaceCallback& callback) {
+  CheckDevice();
+
+  const int release_result = libusb_release_interface(handle_,
+                                                      interface_number);
+  callback.Run(release_result == 0);
+}
+
 void UsbDevice::ControlTransfer(const TransferDirection direction,
     const TransferRequestType request_type, const TransferRecipient recipient,
     const uint8 request, const uint16 value, const uint16 index,
diff --git a/chrome/browser/usb/usb_device.h b/chrome/browser/usb/usb_device.h
index cd7b511..55e047a 100644
--- a/chrome/browser/usb/usb_device.h
+++ b/chrome/browser/usb/usb_device.h
@@ -39,6 +39,7 @@ enum UsbTransferStatus {
 
 typedef base::Callback<void(UsbTransferStatus, scoped_refptr<net::IOBuffer>,
     size_t)> UsbTransferCallback;
+typedef base::Callback<void(bool)> UsbInterfaceCallback;
 
 // A UsbDevice wraps the platform's underlying representation of what a USB
 // device actually is, and provides accessors for performing many of the
@@ -59,6 +60,12 @@ class UsbDevice : public base::RefCounted<UsbDevice> {
   // Close the USB device and release the underlying platform device.
   virtual void Close();
 
+  virtual void ClaimInterface(const int interface_number,
+                              const UsbInterfaceCallback& callback);
+
+  virtual void ReleaseInterface(const int interface_number,
+                                const UsbInterfaceCallback& callback);
+
   virtual void ControlTransfer(const TransferDirection direction,
                                const TransferRequestType request_type,
                                const TransferRecipient recipient,