genode/repos/os/include/usb_session/usb_session.h

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/**
* \brief USB session for raw device connection
* \author Sebastian Sumpf
* \date 2014-12-08
*/
/*
* Copyright (C) 2014 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__USB_SESSION__USB_SESSION_H_
#define _INCLUDE__USB_SESSION__USB_SESSION_H_
#include <os/packet_stream.h>
#include <packet_stream_tx/packet_stream_tx.h>
#include <session/session.h>
#include <usb/types.h>
namespace Usb {
using namespace Genode;
class Session;
struct Packet_descriptor;
struct Completion;
}
/**
* USB packet type
*/
struct Usb::Packet_descriptor : Genode::Packet_descriptor
{
enum Type { STRING, CTRL, BULK, IRQ, ALT_SETTING, CONFIG, RELEASE_IF };
Type type;
bool succeded = false;
Completion *completion = nullptr;
union
{
struct
{
uint8_t index;
unsigned length;
} string;
struct
{
uint8_t request;
uint8_t request_type;
uint16_t value;
uint16_t index;
int actual_size; /* returned */
int timeout;
} control;
struct
{
uint8_t ep;
int actual_size; /* returned */
int timeout;
} transfer;
struct
{
uint8_t number;
uint8_t alt_setting;
} interface;
struct
{
uint8_t number;
};
};
enum Error { NO_ERROR, STALL_ERROR };
Error error = NO_ERROR;
bool is_read_transfer() { return transfer.ep & ENDPOINT_IN; }
Packet_descriptor(off_t offset = 0, size_t size = 0)
: Genode::Packet_descriptor(offset, size) { }
Packet_descriptor(Genode::Packet_descriptor p, Type type, Completion *completion = nullptr)
: Genode::Packet_descriptor(p.offset(), p.size()), type(type), completion(completion) { }
};
/**
* Completion for asynchronous communication
*/
struct Usb::Completion
{
virtual void complete(Usb::Packet_descriptor &p) = 0;
};
struct Usb::Session : public Genode::Session
{
/****************
** Exceptions **
****************/
class Device_not_found : public Exception { };
class Interface_not_found : public Exception { };
class Interface_already_claimed : public Exception { };
class Interface_not_claimed : public Exception { };
class Invalid_endpoint : public Exception { };
/*******************
** Packet stream **
*******************/
enum { TX_QUEUE_SIZE = 64 };
typedef Packet_stream_policy<Usb::Packet_descriptor,
TX_QUEUE_SIZE, TX_QUEUE_SIZE,
char> Tx_policy;
typedef Packet_stream_tx::Channel<Tx_policy> Tx;
/**
* Request packet-transmission channel
*/
virtual Tx *tx_channel() { return 0; }
/**
* Request client-side packet-stream interface of tx channel
*/
virtual Tx::Source *source() { return 0; }
/***********************
** Session interface **
***********************/
static const char *service_name() { return "Usb"; }
/**
* Send from the server to the client upon device state change
*/
virtual void sigh_state_change(Signal_context_capability sigh) = 0;
/**
* Is the device present
*/
virtual bool plugged() = 0;
/**
* Retrieve device and current configurations despcriptors
*/
virtual void config_descriptor(Device_descriptor *device_descr,
Config_descriptor *config_descr) = 0;
/**
* Return number of alt settings for iterface
*/
virtual unsigned alt_settings(unsigned index) = 0;
/**
* Return interface descriptor for interface index/alternate setting tuple
*/
virtual void interface_descriptor(unsigned index, unsigned alt_setting,
Interface_descriptor *interface_descr) = 0;
/**
* Return endpoint for interface index/alternate setting tuple
*/
virtual void endpoint_descriptor(unsigned interface_num,
unsigned alt_setting,
unsigned endpoint_num,
Endpoint_descriptor *endpoint_descr) = 0;
/**
* Claim an interface number
*/
virtual void claim_interface(unsigned interface_num) = 0;
/**
* Release an interface number
*/
virtual void release_interface(unsigned interface_num) = 0;
GENODE_RPC(Rpc_plugged, bool, plugged);
GENODE_RPC(Rpc_sigh_state_change, void, sigh_state_change, Signal_context_capability);
GENODE_RPC(Rpc_tx_cap, Capability<Tx>, _tx_cap);
GENODE_RPC_THROW(Rpc_config_descr, void, config_descriptor, GENODE_TYPE_LIST(Device_not_found),
Device_descriptor *, Config_descriptor *);
GENODE_RPC(Rpc_alt_settings, unsigned, alt_settings, unsigned);
GENODE_RPC_THROW(Rpc_iface_descr, void, interface_descriptor, GENODE_TYPE_LIST(Device_not_found,
Interface_not_found), unsigned, unsigned, Interface_descriptor *);
GENODE_RPC_THROW(Rpc_ep_descr, void, endpoint_descriptor, GENODE_TYPE_LIST(Device_not_found,
Interface_not_found), unsigned, unsigned, unsigned, Endpoint_descriptor *);
GENODE_RPC_THROW(Rpc_claim_interface, void, claim_interface, GENODE_TYPE_LIST(Interface_not_found,
Interface_already_claimed), unsigned);
GENODE_RPC_THROW(Rpc_release_interface, void, release_interface, GENODE_TYPE_LIST(Interface_not_found),
unsigned);
GENODE_RPC_INTERFACE(Rpc_plugged, Rpc_sigh_state_change, Rpc_tx_cap, Rpc_config_descr,
Rpc_iface_descr, Rpc_ep_descr, Rpc_alt_settings, Rpc_claim_interface,
Rpc_release_interface);
};
#endif /* _INCLUDE__USB_SESSION__USB_SESSION_H_ */