diff options
| -rw-r--r-- | host/lib/transport/libusb1_control.cpp | 238 | ||||
| -rw-r--r-- | host/lib/transport/libusb1_zero_copy.cpp | 854 |
2 files changed, 1092 insertions, 0 deletions
diff --git a/host/lib/transport/libusb1_control.cpp b/host/lib/transport/libusb1_control.cpp new file mode 100644 index 000000000..2903d943d --- /dev/null +++ b/host/lib/transport/libusb1_control.cpp @@ -0,0 +1,238 @@ +// +// Copyright 2010 Ettus Research LLC +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. +// + +#include <uhd/types/usb_descriptor.hpp> +#include <uhd/utils/exception.hpp> +#include <uhd/transport/usb_control.hpp> +#include <libusb-1.0/libusb.h> +#include <boost/asio.hpp> +#include <iostream> + +using namespace uhd::transport; + +static int libusb_debug_level = 0; +static int libusb_timeout = 0; + +/*********************************************************************** + * libusb-1.0 implementation of USB control transport + **********************************************************************/ +class libusb_control_impl : public usb_control { +public: + libusb_control_impl(uhd::usb_descriptor_t descriptor); + ~libusb_control_impl(); + + size_t submit(boost::uint8_t request_type, + boost::uint8_t request, + boost::uint16_t value, + boost::uint16_t index, + unsigned char *buff, + boost::uint16_t length); + + static uhd::usb_descriptor_t create_descriptor(libusb_device *dev); + static std::string get_serial(libusb_device *dev); + +private: + uhd::usb_descriptor_t _descriptor; + + libusb_context *_ctx; + libusb_device_handle *_dev_handle; + + bool open_device(); + bool open_interface(); + bool compare_device(libusb_device *dev, uhd::usb_descriptor_t descriptor); +}; + + +libusb_control_impl::libusb_control_impl(uhd::usb_descriptor_t descriptor) + : _descriptor(descriptor), _ctx(NULL), _dev_handle(NULL) +{ + if (libusb_init(&_ctx) < 0) + UHD_THROW_SITE_INFO("USB: failed to initialize libusb"); + + libusb_set_debug(_ctx, libusb_debug_level); + + if (!open_device()) + UHD_THROW_SITE_INFO("USB: failed to open device"); + + if (!open_interface()) + UHD_THROW_SITE_INFO("USB: failed to open device interface"); +} + + +libusb_control_impl::~libusb_control_impl() +{ + libusb_close(_dev_handle); + libusb_exit(_ctx); +} + + +uhd::usb_descriptor_t libusb_control_impl::create_descriptor(libusb_device *dev) +{ + libusb_device_descriptor desc; + + if (libusb_get_device_descriptor(dev, &desc) < 0) + UHD_THROW_SITE_INFO("USB: failed to get device descriptor"); + + uhd::usb_descriptor_t descriptor; + + descriptor.serial = get_serial(dev); + descriptor.product_id = desc.idProduct; + descriptor.vendor_id = desc.idVendor; + descriptor.device_addr = libusb_get_device_address(dev); + + return descriptor; +} + + +std::string libusb_control_impl::get_serial(libusb_device *dev) +{ + unsigned char buff[32]; + + libusb_device_descriptor desc; + if (libusb_get_device_descriptor(dev, &desc) < 0) + return ""; + + if (desc.iSerialNumber == 0) + return ""; + + //open the device because we have to + libusb_device_handle *dev_handle; + if (libusb_open(dev, &dev_handle) < 0) + return ""; + + if (libusb_get_string_descriptor_ascii(dev_handle, desc.iSerialNumber, + buff, sizeof(buff)) < 0) { + return ""; + } + + libusb_close(dev_handle); + + return (char*) buff; +} + + +bool libusb_control_impl::open_device() +{ + libusb_device **list; + libusb_device *dev; + + ssize_t cnt = libusb_get_device_list(_ctx, &list); + + if (cnt < 0) + return cnt; + + ssize_t i = 0; + for (i = 0; i < cnt; i++) { + dev = list[i]; + if (compare_device(dev, _descriptor)) + goto found; + } + return false; + +found: + int ret; + if ((ret = libusb_open(dev, &_dev_handle)) < 0) + return false; + else + return true; +} + + +bool libusb_control_impl::compare_device(libusb_device *dev, + uhd::usb_descriptor_t descriptor) +{ + std::string serial = descriptor.serial; + boost::uint16_t vendor_id = descriptor.vendor_id; + boost::uint16_t product_id = descriptor.product_id; + boost::uint8_t device_addr = descriptor.device_addr; + + libusb_device_descriptor libusb_desc; + if (libusb_get_device_descriptor(dev, &libusb_desc) < 0) + return false; + if (serial != get_serial(dev)) + return false; + if (vendor_id != libusb_desc.idVendor) + return false; + if (product_id != libusb_desc.idProduct) + return false; + if (device_addr != libusb_get_device_address(dev)) + return false; + + return true; +} + + +bool libusb_control_impl::open_interface() +{ + if (libusb_claim_interface(_dev_handle, 0) < 0) + return false; + else + return true; +} + + +size_t libusb_control_impl::submit(boost::uint8_t request_type, + boost::uint8_t request, + boost::uint16_t value, + boost::uint16_t index, + unsigned char *buff, + boost::uint16_t length) +{ + return libusb_control_transfer(_dev_handle, + request_type, + request, + value, + index, + buff, + length, + libusb_timeout); +} + + +/*********************************************************************** + * USB control public make functions + **********************************************************************/ +usb_control::sptr usb_control::make(uhd::usb_descriptor_t descriptor) +{ + return sptr(new libusb_control_impl(descriptor)); +} + +uhd::usb_descriptors_t usb_control::get_device_list() +{ + libusb_device **list; + uhd::usb_descriptors_t descriptors; + + if (libusb_init(NULL) < 0) + UHD_THROW_SITE_INFO("USB: failed to initialize libusb"); + + ssize_t cnt = libusb_get_device_list(NULL, &list); + + if (cnt < 0) + UHD_THROW_SITE_INFO("USB: failed to get device list"); + + ssize_t i = 0; + for (i = 0; i < cnt; i++) { + libusb_device *dev = list[i]; + descriptors.push_back(libusb_control_impl::create_descriptor(dev)); + } + + libusb_free_device_list(list, 0); + libusb_exit(NULL); + return descriptors; +} + + diff --git a/host/lib/transport/libusb1_zero_copy.cpp b/host/lib/transport/libusb1_zero_copy.cpp new file mode 100644 index 000000000..39617e4dd --- /dev/null +++ b/host/lib/transport/libusb1_zero_copy.cpp @@ -0,0 +1,854 @@ +// +// Copyright 2010 Ettus Research LLC +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. +// + + +#include <uhd/transport/usb_zero_copy.hpp> +#include <uhd/utils/assert.hpp> +#include <libusb-1.0/libusb.h> +#include <boost/asio.hpp> +#include <boost/format.hpp> +#include <iostream> +#include <iomanip> + +using namespace uhd::transport; + +static int libusb_debug_level = 3; + +/*********************************************************************** + * Helper functions + * + * Print to stdout the values of a libusb_transfer struct + ***********************************************************************/ +void pp_transfer(libusb_transfer *lut) +{ + std::cout << "Libusb transfer" << std::endl; + std::cout << " flags: 0x" << std::hex << (unsigned int) lut->flags << std::endl; + std::cout << " endpoint: 0x" << std::hex << (unsigned int) lut->endpoint << std::endl; + std::cout << " type: 0x" << std::hex << (unsigned int) lut->type << std::endl; + std::cout << " timeout: " << std::dec << lut->timeout << std::endl; + std::cout << " status: 0x" << std::hex << lut->status << std::endl; + std::cout << " length: " << std::dec << lut->length << std::endl; + std::cout << " actual_length: " << std::dec << lut->actual_length << std::endl; +} + +/*********************************************************************** + * USB asynchronous phony zero_copy endpoint + * This endpoint implementation provides asynchronous I/O to libusb-1.0 + * devices. Each endpoint is directional and two can be combined to + * create a bidirectional interface. It is a zero copy implementation + * with respect to libusb, however, each send and recv requires a copy + * operation from kernel to userspace; this is due to the usbfs + * interface provided by the kernel. + **********************************************************************/ +class usb_endpoint { +private: + libusb_device_handle *_dev_handle; + libusb_context *_ctx; + int _endpoint; + bool _input; + + size_t _transfer_size; + size_t _num_transfers; + + /* + * Transfer state lists (free, pending, or completed) + */ + std::list<libusb_transfer *> _free_list; + std::list<libusb_transfer *> _pending_list; + std::list<libusb_transfer *> _completed_list; + + /* + * Calls for processing asynchronous I/O + */ + libusb_transfer *allocate_transfer(int buff_len); + bool cancel(libusb_transfer *lut); + bool cancel_all(); + bool reap_pending_list(); + bool reap_pending_list_timeout(); + bool reap_completed_list(); + + /* + * Transfer state manipulators + */ + void free_list_add(libusb_transfer *lut); + void pending_list_add(libusb_transfer *lut); + void completed_list_add(libusb_transfer *lut); + libusb_transfer *free_list_get(); + libusb_transfer *completed_list_get(); + bool pending_list_remove(libusb_transfer *lut); + + /* + * Misc + */ + void print_transfer_status(libusb_transfer *lut); + +public: + usb_endpoint(libusb_device_handle *dev_handle, + libusb_context *ctx, int endpoint, bool input, + size_t transfer_size, size_t num_transfers); + + ~usb_endpoint(); + + /* + * Accessors + */ + int get_endpoint() const { return _endpoint; } + bool get_direction() const { return _input; } + libusb_device_handle *get_dev_handle() const { return _dev_handle; } + libusb_context *get_ctx() const { return _ctx; } + + /* + * Exposed interface for submitting / retrieving transfer buffers + * used in zero-copy interface + */ + bool submit(libusb_transfer *lut); + libusb_transfer *get_completed_transfer(); + libusb_transfer *get_free_transfer(); + + /* + * Callback use only + */ + void callback_handle_transfer(libusb_transfer *lut); +}; + + +/* + * Callback function called when submitted transfers complete. + * The endpoint upon which the transfer is part of is recovered + * and the transfer moved from pending to completed state. + */ +static void callback(libusb_transfer *lut) +{ + usb_endpoint *endpoint = (usb_endpoint *) lut->user_data; + endpoint->callback_handle_transfer(lut); +} + + +/* + * Accessor call to allow list access from callback space + */ +void usb_endpoint::callback_handle_transfer(libusb_transfer *lut) +{ + if (!pending_list_remove(lut)) { + std::cerr << "USB: pending remove failed" << std::endl; + return; + } + + completed_list_add(lut); +} + + +/* + * Constructor + * + * Allocate libusb transfers. For IN endpoints, submit the transfers + * so that they're ready to return when data is available. + */ +usb_endpoint::usb_endpoint(libusb_device_handle *dev_handle, + libusb_context *ctx, int endpoint, bool input, + size_t transfer_size, size_t num_transfers) + : _dev_handle(dev_handle), + _ctx(ctx), _endpoint(endpoint), _input(input), + _transfer_size(transfer_size), _num_transfers(num_transfers) +{ + unsigned int i; + for (i = 0; i < _num_transfers; i++) { + free_list_add(allocate_transfer(_transfer_size)); + + if (_input) + submit(free_list_get()); + } +} + + +/* + * Destructor + */ +usb_endpoint::~usb_endpoint() +{ + cancel_all(); + + while (!_pending_list.empty()) { + if (!reap_pending_list()) + std::cerr << "error: destructor failed to reap" << std::endl; + } + + while (!_completed_list.empty()) { + if (!reap_completed_list()) + std::cerr << "error: destructor failed to reap" << std::endl; + } + + while (!_free_list.empty()) { + libusb_free_transfer(free_list_get()); + } +} + + +/* + * Allocate a libusb transfer + * + * The allocated transfer is continuously reused and should be freed at + * shutdown. + */ +libusb_transfer *usb_endpoint::allocate_transfer(int buff_len) +{ + libusb_transfer *lut = libusb_alloc_transfer(0); + + unsigned char *buff = new unsigned char[buff_len]; + + unsigned int endpoint = ((_endpoint & 0x7f) | (_input ? 0x80 : 0)); + + libusb_fill_bulk_transfer(lut, // transfer + _dev_handle, // dev_handle + endpoint, // endpoint + buff, // buffer + buff_len, // length + callback, // callback + this, // user_data + 0); // timeout + return lut; +} + + +/* + * Asynchonous transfer submission + * + * Submit and mark transfer as pending. + */ +bool usb_endpoint::submit(libusb_transfer *lut) +{ + int retval; + if ((retval = libusb_submit_transfer(lut)) < 0) { + std::cerr << "error: libusb_submit_transfer: " << retval << std::endl; + return false; + } + + pending_list_add(lut); + return true; +} + + +/* + * Cancel a pending transfer + * + * Search the pending list for the transfer and cancel if found. + * Returns true on success. False otherwise or on error. + * + * Note: success only indicates submission of cancelation request. + * Sucessful cancelation is not known until the callback occurs. + */ +bool usb_endpoint::cancel(libusb_transfer *lut) +{ + std::list<libusb_transfer*>::iterator iter; + for (iter = _pending_list.begin(); iter != _pending_list.end(); iter++) { + if (*iter == lut) { + libusb_cancel_transfer(lut); + return true; + } + } + return false; +} + + +/* + * Cancel all pending transfers + * + * Note: success only indicates submission of cancelation request. + * Sucessful cancelation is not known until the callback occurs. + */ +bool usb_endpoint::cancel_all() +{ + std::list<libusb_transfer*>::iterator iter; + + for (iter = _pending_list.begin(); iter != _pending_list.end(); iter++) { + if (libusb_cancel_transfer(*iter) < 0) { + std::cerr << "error: libusb_cancal_transfer() failed" << std::endl; + return false; + } + } + + return true; +} + + +/* + * Reap completed transfers + * + * return true if at least one transfer was reaped, false otherwise. + * + * Check completed transfers for errors and mark as free. This is a + * blocking call. + */ +bool usb_endpoint::reap_completed_list() +{ + libusb_transfer *lut; + + if (_completed_list.empty()) { + if (!reap_pending_list_timeout()) + return false; + } + + while (!_completed_list.empty()) { + lut = completed_list_get(); + print_transfer_status(lut); + free_list_add(lut); + } + + return true; +} + + +/* + * Print completed transfer status error(s) + * + * return true if at least one transfer was reaped, false otherwise. + * + * Check completed transfers for errors and mark as free. This is a + * blocking call. + */ +void usb_endpoint::print_transfer_status(libusb_transfer *lut) +{ + switch (lut->status) { + case LIBUSB_TRANSFER_COMPLETED: + if (lut->actual_length < lut->length) { + std::cerr << "USB: transfer completed with short write," + << " length = " << lut->length + << " actual = " << lut->actual_length << std::endl; + } + + if ((lut->actual_length < 0) || (lut->length < 0)) { + std::cerr << "USB: transfer completed with invalid response" + << std::endl; + } + break; + case LIBUSB_TRANSFER_CANCELLED: + break; + case LIBUSB_TRANSFER_NO_DEVICE: + std::cerr << "USB: device was disconnected" << std::endl; + break; + case LIBUSB_TRANSFER_OVERFLOW: + std::cerr << "USB: device sent more data than requested" << std::endl; + break; + case LIBUSB_TRANSFER_TIMED_OUT: + std::cerr << "USB: transfer timed out" << std::endl; + break; + case LIBUSB_TRANSFER_STALL: + std::cerr << "USB: halt condition detected (endpoint stalled)" << std::endl; + break; + case LIBUSB_TRANSFER_ERROR: + std::cerr << "USB: transfer failed" << std::endl; + break; + default: + std::cerr << "USB: received unknown transfer status" << std::endl; + } +} + + +/* + * Reap pending transfers + * + * Return true if at least one transfer was reaped, false otherwise. This is + * a blocking call. + * + * Reaping submitted transfers is handled by libusb and the assigned callback + * function. Block until at least one transfer is reaped. + */ +bool usb_endpoint::reap_pending_list() +{ + int retval; + + if ((retval = libusb_handle_events(_ctx)) < 0) { + std::cerr << "error: libusb_handle_events: " << retval << std::endl; + return false; + } + + return true; +} + + +/* + * Reap pending transfers with timeout + * + * Return true if at least one transfer was reaped, false otherwise. This call + * blocks until a transfer is reaped or timeout. + * + * Reaping submitted transfers is handled by libusb and the assigned callback + * function. Block until at least one transfer is reaped or timeout occurs. + */ +bool usb_endpoint::reap_pending_list_timeout() +{ + int retval; + timeval tv; + + tv.tv_sec = 0; + tv.tv_usec = 100000; //100ms + + size_t pending_list_size = _pending_list.size(); + + if ((retval = libusb_handle_events_timeout(_ctx, &tv)) < 0) { + std::cerr << "error: libusb_handle_events: " << retval << std::endl; + return false; + } + + if (_pending_list.size() < pending_list_size) { + return true; + } + else { + return false; + } +} + + +/* + * Returns a free transfer with empty data bufer for OUT requests + */ +libusb_transfer *usb_endpoint::get_free_transfer() +{ + if (_free_list.empty()) { + if (!reap_completed_list()) + return NULL; + } + + return free_list_get(); +} + + +/* + * Returns a transfer containing data for IN requests + */ +libusb_transfer *usb_endpoint::get_completed_transfer() +{ + if (_completed_list.empty()) { + if (!reap_pending_list_timeout()) + return NULL; + } + + return completed_list_get(); +} + +/* + * List operations + */ +void usb_endpoint::free_list_add(libusb_transfer *lut) +{ + _free_list.push_back(lut); +} + +void usb_endpoint::pending_list_add(libusb_transfer *lut) +{ + _pending_list.push_back(lut); +} + +void usb_endpoint::completed_list_add(libusb_transfer *lut) +{ + _completed_list.push_back(lut); +} + + +/* + * Free and completed lists don't have ordered content + * + * Pop transfers from the front as needed + */ +libusb_transfer *usb_endpoint::free_list_get() +{ + libusb_transfer *lut; + + if (_free_list.size() == 0) { + return NULL; + } + else { + lut = _free_list.front(); + _free_list.pop_front(); + return lut; + } +} + + +/* + * Free and completed lists don't have ordered content + * + * Pop transfers from the front as needed + */ +libusb_transfer *usb_endpoint::completed_list_get() +{ + libusb_transfer *lut; + + if (_completed_list.empty()) { + return NULL; + } + else { + lut = _completed_list.front(); + _completed_list.pop_front(); + return lut; + } +} + + +/* + * Search and remove transfer from pending list + * + * Assuming that the callbacks occur in order, the front element + * should yield the correct transfer. If not, then something else + * is going on. If no transfers match, then something went wrong. + */ +bool usb_endpoint::pending_list_remove(libusb_transfer *lut) +{ + std::list<libusb_transfer*>::iterator iter; + for (iter = _pending_list.begin(); iter != _pending_list.end(); iter++) { + if (*iter == lut) { + _pending_list.erase(iter); + return true; + } + } + return false; +} + + +/*********************************************************************** + * Managed buffers + **********************************************************************/ +class libusb_managed_recv_buffer_impl : public managed_recv_buffer { +public: + libusb_managed_recv_buffer_impl(libusb_transfer *lut, + usb_endpoint *endpoint) + : _buff(lut->buffer, lut->length) + { + _lut = lut; + _endpoint = endpoint; + } + + ~libusb_managed_recv_buffer_impl() + { + if (!_endpoint->submit(_lut)) + std::cerr << "USB: failed to submit IN transfer" << std::endl; + } + +private: + const boost::asio::const_buffer &get() const + { + return _buff; + } + + libusb_transfer *_lut; + usb_endpoint *_endpoint; + const boost::asio::const_buffer _buff; +}; + + +class libusb_managed_send_buffer_impl : public managed_send_buffer { +public: + libusb_managed_send_buffer_impl(libusb_transfer *lut, + usb_endpoint *endpoint, + size_t buff_size) + : _buff(lut->buffer, buff_size) + { + _lut = lut; + _endpoint = endpoint; + } + + ~libusb_managed_send_buffer_impl() + { + /* NOP */ + } + + ssize_t commit(size_t num_bytes) + { + _lut->length = num_bytes; + _lut->actual_length = 0; + + if (_endpoint->submit(_lut)) + return num_bytes; + else + return 0; + } + +private: + const boost::asio::mutable_buffer &get() const + { + return _buff; + } + + libusb_transfer *_lut; + usb_endpoint *_endpoint; + const boost::asio::mutable_buffer _buff; +}; + + +/*********************************************************************** + * USB zero_copy device class + **********************************************************************/ +class libusb_zero_copy_impl : public usb_zero_copy +{ +private: + usb_endpoint *_rx_ep; + usb_endpoint *_tx_ep; + + /* + * Libusb handles + */ + libusb_context *_rx_ctx; + libusb_context *_tx_ctx; + libusb_device_handle *_rx_dev_handle; + libusb_device_handle *_tx_dev_handle; + + int _rx_endpoint; + int _tx_endpoint; + + size_t _recv_buff_size; + size_t _send_buff_size; + size_t _num_frames; + + bool open_device(uhd::usb_descriptor_t descriptor); + bool open_interface(libusb_device_handle *dev_handle, int interface); + bool compare_device(libusb_device *dev, uhd::usb_descriptor_t descriptor); + + std::string get_serial(libusb_device *dev); + +public: + typedef boost::shared_ptr<libusb_zero_copy_impl> sptr; + + /* + * Structors + */ + libusb_zero_copy_impl(uhd::usb_descriptor_t descriptor, + unsigned int rx_endpoint, + unsigned int tx_endpoint, + size_t recv_buff_size, + size_t send_buff_size); + + ~libusb_zero_copy_impl(); + + managed_recv_buffer::sptr get_recv_buff(void); + managed_send_buffer::sptr get_send_buff(void); + + size_t get_num_recv_frames(void) const { return _num_frames; } + size_t get_num_send_frames(void) const { return _num_frames; } +}; + + +libusb_zero_copy_impl::libusb_zero_copy_impl(uhd::usb_descriptor_t descriptor, + unsigned int rx_endpoint, + unsigned int tx_endpoint, + size_t buff_size, + size_t block_size) + : _rx_ctx(NULL), _tx_ctx(NULL), _rx_dev_handle(NULL), _tx_dev_handle(NULL), + _recv_buff_size(block_size), _send_buff_size(block_size), + _num_frames(buff_size / block_size) +{ + if (libusb_init(&_rx_ctx) < 0) + std::cerr << "error: libusb_init" << std::endl; + + if (libusb_init(&_tx_ctx) < 0) + std::cerr << "error: libusb_init" << std::endl; + + libusb_set_debug(_rx_ctx, libusb_debug_level); + libusb_set_debug(_tx_ctx, libusb_debug_level); + + open_device(descriptor); + + open_interface(_rx_dev_handle, 2); + open_interface(_tx_dev_handle, 1); + + _rx_ep = new usb_endpoint(_rx_dev_handle, + _rx_ctx, + rx_endpoint, + true, + _recv_buff_size, + _num_frames); + + _tx_ep = new usb_endpoint(_tx_dev_handle, + _tx_ctx, + tx_endpoint, + false, + _send_buff_size, + _num_frames); +} + + +libusb_zero_copy_impl::~libusb_zero_copy_impl() +{ + delete _rx_ep; + delete _tx_ep; + + libusb_close(_rx_dev_handle); + libusb_close(_tx_dev_handle); + + libusb_exit(_rx_ctx); + libusb_exit(_tx_ctx); +} + + +bool libusb_zero_copy_impl::open_device(uhd::usb_descriptor_t descriptor) +{ + libusb_device **rx_list; + libusb_device **tx_list; + + bool rx_found = false; + bool tx_found = false; + + ssize_t rx_cnt = libusb_get_device_list(_rx_ctx, &rx_list); + ssize_t tx_cnt = libusb_get_device_list(_tx_ctx, &tx_list); + + if ((rx_cnt < 0) | (tx_cnt < 0) | (rx_cnt != tx_cnt)) + return false; + + //find and open the receive device + for (ssize_t i = 0; i < rx_cnt; i++) { + libusb_device *dev = rx_list[i]; + + if (compare_device(dev, descriptor)) { + libusb_open(dev, &_rx_dev_handle); + rx_found = true; + break; + } + } + + //find and open the transmit device + for (ssize_t i = 0; i < tx_cnt; i++) { + libusb_device *dev = tx_list[i]; + + if (compare_device(dev, descriptor)) { + libusb_open(dev, &_tx_dev_handle); + tx_found = true; + } + } + + libusb_free_device_list(rx_list, 0); + libusb_free_device_list(tx_list, 0); + + if (tx_found && rx_found) + return true; + else + return false; +} + +bool libusb_zero_copy_impl::compare_device(libusb_device *dev, + uhd::usb_descriptor_t descriptor) +{ + std::string serial = descriptor.serial; + boost::uint16_t vendor_id = descriptor.vendor_id; + boost::uint16_t product_id = descriptor.product_id; + boost::uint8_t device_addr = descriptor.device_addr; + + libusb_device_descriptor desc; + libusb_get_device_descriptor(dev, &desc); + + if (serial.compare(get_serial(dev))) + return false; + if (vendor_id != desc.idVendor) + return false; + if (product_id != desc.idProduct) + return false; + if (device_addr != libusb_get_device_address(dev)) + return false; + + return true; +} + +bool libusb_zero_copy_impl::open_interface(libusb_device_handle *dev_handle, + int interface) +{ + int ret = libusb_claim_interface(dev_handle, interface); + if (ret < 0) { + std::cerr << "error: libusb_claim_interface() " << ret << std::endl; + return false; + } + else { + return true; + } +} + +std::string libusb_zero_copy_impl::get_serial(libusb_device *dev) +{ + unsigned char buff[32]; + + libusb_device_descriptor desc; + if (libusb_get_device_descriptor(dev, &desc) < 0) { + std::cerr << "error: libusb_get_device_descriptor()" << std::endl; + return ""; + } + + if (desc.iSerialNumber == 0) + return ""; + + //open the device because we have to + libusb_device_handle *dev_handle; + if (libusb_open(dev, &dev_handle) < 0) { + return ""; + } + + if (libusb_get_string_descriptor_ascii(dev_handle, desc.iSerialNumber, + buff, sizeof(buff)) < 0) { + std::cerr << "error: libusb_get_string_descriptor_ascii()" << std::endl; + return ""; + } + + libusb_close(dev_handle); + + return (char*) buff; +} + + +managed_recv_buffer::sptr libusb_zero_copy_impl::get_recv_buff() +{ + libusb_transfer *lut = _rx_ep->get_completed_transfer(); + if (lut == NULL) { + return managed_recv_buffer::sptr(); + } + else { + return managed_recv_buffer::sptr( + new libusb_managed_recv_buffer_impl(lut, + _rx_ep)); + } +} + + +managed_send_buffer::sptr libusb_zero_copy_impl::get_send_buff() +{ + libusb_transfer *lut = _tx_ep->get_free_transfer(); + if (lut == NULL) { + return managed_send_buffer::sptr(); + } + else { + return managed_send_buffer::sptr( + new libusb_managed_send_buffer_impl(lut, + _tx_ep, + _send_buff_size)); + } +} + + +/*********************************************************************** + * USB zero_copy make functions + **********************************************************************/ +usb_zero_copy::sptr usb_zero_copy::make(uhd::usb_descriptor_t descriptor, + unsigned int rx_endpoint, + unsigned int tx_endpoint, + size_t buff_size, + size_t block_size) + +{ + return sptr(new libusb_zero_copy_impl(descriptor, + rx_endpoint, + tx_endpoint, + buff_size, + block_size)); +} + + + |