| // Copyright 2019 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef ZIRCON_SYSTEM_DEV_AUDIO_USB_AUDIO_USB_MIDI_SINK_H_ |
| #define ZIRCON_SYSTEM_DEV_AUDIO_USB_AUDIO_USB_MIDI_SINK_H_ |
| |
| #include <fuchsia/hardware/midi/llcpp/fidl.h> |
| #include <lib/sync/completion.h> |
| |
| #include <ddktl/device.h> |
| #include <ddktl/protocol/empty-protocol.h> |
| #include <fbl/mutex.h> |
| #include <lib/zircon-internal/thread_annotations.h> |
| #include <usb/request-cpp.h> |
| #include <usb/usb.h> |
| |
| namespace audio { |
| namespace usb { |
| |
| class UsbMidiSink; |
| using UsbMidiSinkBase = ddk::Device<UsbMidiSink, ddk::Unbindable, ddk::Openable, ddk::Closable, |
| ddk::Writable, ddk::Messageable>; |
| |
| class UsbMidiSink : public UsbMidiSinkBase, |
| public llcpp::fuchsia::hardware::midi::Device::Interface, |
| public ddk::EmptyProtocol<ZX_PROTOCOL_MIDI> { |
| public: |
| using UsbDevice = ::usb::UsbDevice; |
| using UsbRequest = ::usb::Request<>; |
| using UsbRequestQueue = ::usb::RequestQueue<>; |
| |
| UsbMidiSink(zx_device_t* parent, const UsbDevice& usb, size_t parent_req_size) |
| : UsbMidiSinkBase(parent), usb_(usb), parent_req_size_(parent_req_size) {} |
| |
| static zx_status_t Create(zx_device_t* parent, const UsbDevice& usb, int index, |
| const usb_interface_descriptor_t* intf, |
| const usb_endpoint_descriptor_t* ep, size_t req_size); |
| |
| // Device protocol implementation. |
| void DdkUnbind(); |
| void DdkRelease(); |
| zx_status_t DdkOpen(zx_device_t** dev_out, uint32_t flags); |
| zx_status_t DdkClose(uint32_t flags); |
| zx_status_t DdkWrite(const void* buf, size_t count, zx_off_t off, size_t* actual); |
| zx_status_t DdkMessage(fidl_msg_t* msg, fidl_txn_t* txn); |
| |
| // FIDL methods. |
| void GetInfo(GetInfoCompleter::Sync completer) final; |
| |
| private: |
| zx_status_t Init(int index, const usb_interface_descriptor_t* intf, |
| const usb_endpoint_descriptor_t* ep); |
| void UpdateSignals() TA_REQ(mutex_); |
| void WriteComplete(usb_request_t* req); |
| |
| UsbDevice usb_; |
| |
| // pool of free USB requests |
| UsbRequestQueue free_write_reqs_; |
| // mutex for synchronizing access to free_write_reqs and open |
| fbl::Mutex mutex_; |
| // completion signals free_write_reqs not empty |
| sync_completion_t free_write_completion_; |
| |
| bool open_ TA_GUARDED(mutex_) = false; |
| bool dead_ TA_GUARDED(mutex_) = false; |
| |
| // the last signals we reported |
| zx_signals_t signals_ TA_GUARDED(mutex_); |
| uint64_t parent_req_size_; |
| }; |
| |
| } // namespace usb |
| } // namespace audio |
| |
| #endif // ZIRCON_SYSTEM_DEV_AUDIO_USB_AUDIO_USB_MIDI_SINK_H_ |