mirror of
https://github.com/RangeNetworks/openbts.git
synced 2025-10-24 16:43:58 +00:00
5289a229d9
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@6168 19bc5d8c-e614-43d4-8b26-e1612bc8e597
516 lines
11 KiB
C++
516 lines
11 KiB
C++
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <fusb.h>
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#include <libusb-1.0/libusb.h>
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#include <stdexcept>
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#include <cstdio>
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#include <assert.h>
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#include <string.h>
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#include <algorithm>
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#include <errno.h>
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#include <string.h>
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// ------------------------------------------------------------------------
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// libusb_transfer allocation, deallocation, and callback
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// ------------------------------------------------------------------------
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static void
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free_lut (libusb_transfer *lut)
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{
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// if this was an input transfer, free the buffer
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if (lut->endpoint & 0x80)
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delete [] ((unsigned char *) lut->buffer);
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libusb_free_transfer(lut);
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}
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/*
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* The callback means the libusb_transfer is completed whether sent, cancelled,
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* or failed. Move the libusb_transfer from the pending list to the
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* completed list. If the cancel is from the destructor then free the
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* transfer instead; normally this won't happen since all endpoints should be
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* destroyed first leaving the pending list empty.
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*/
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static void
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generic_callback(struct libusb_transfer *lut)
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{
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// Fish out devhandle from endpoint
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fusb_devhandle* dev_handle =
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(fusb_devhandle *) ((fusb_ephandle *) lut->user_data)->get_fusb_devhandle();
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dev_handle->pending_remove(lut);
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if (lut->status == LIBUSB_TRANSFER_CANCELLED && dev_handle->_teardown() == 1)
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{
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free_lut (lut);
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return;
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}
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((fusb_ephandle *) lut->user_data)->completed_list_add(lut);
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}
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static libusb_transfer*
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alloc_lut (fusb_ephandle *self, int buffer_length, int endpoint,
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bool input_p, unsigned char *write_buffer,
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fusb_devhandle *dh)
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{
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struct libusb_transfer* lut = libusb_alloc_transfer(0);
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endpoint = (endpoint & 0x7f) | (input_p ? 0x80 : 0);
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if (input_p)
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write_buffer = new unsigned char [buffer_length];
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// We need the base class libusb_device_handle
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libusb_device_handle *dev_handle = dh->get_usb_dev_handle();
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// Load the libusb_transfer for bulk transfer
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libusb_fill_bulk_transfer (lut, // transfer
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dev_handle, // dev_handle
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endpoint, // endpoint
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write_buffer, // buffer
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buffer_length, // length
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generic_callback, // callback
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self, // user_data
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0); // timeout
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return lut;
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}
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// ------------------------------------------------------------------------
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// device handle
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// ------------------------------------------------------------------------
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fusb_devhandle::fusb_devhandle (libusb_device_handle *udh,
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libusb_context *ctx)
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: d_udh(udh), d_ctx (ctx), d_teardown (false)
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{
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// that's it
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}
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fusb_devhandle::~fusb_devhandle ()
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{
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d_teardown = true;
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}
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fusb_ephandle*
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fusb_devhandle::make_ephandle (int endpoint, bool input_p,
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int block_size, int nblocks)
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{
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return new fusb_ephandle (this, endpoint, input_p,
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block_size, nblocks);
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}
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/*
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* devhandle list manipulators
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*/
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void
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fusb_devhandle::pending_add (libusb_transfer *lut)
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{
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d_pending_rqsts.push_back (lut);
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}
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/*
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* Pull from the pending list
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*/
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libusb_transfer *
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fusb_devhandle::pending_get ()
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{
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if (d_pending_rqsts.empty ())
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return 0;
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libusb_transfer *lut = d_pending_rqsts.front ();
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d_pending_rqsts.pop_front ();
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return lut;
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}
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/*
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* Match libusb_tranfer with the pending list and erase
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* Return true if found, false otherwise
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*/
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bool
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fusb_devhandle::pending_remove (libusb_transfer *lut)
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{
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std::list<libusb_transfer*>::iterator result;
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result = find (d_pending_rqsts.begin (), d_pending_rqsts.end (), lut);
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if (result == d_pending_rqsts.end ()) {
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LOG(ERR) << "Failed to find lut in pending_rqsts";
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return false;
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}
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d_pending_rqsts.erase (result);
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return true;
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}
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/*
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* Submit the libusb_transfer to libusb
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* iff successful, the transfer will be placed on the devhandle pending list.
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*/
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bool
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fusb_devhandle::_submit_lut (libusb_transfer *lut)
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{
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int ret = libusb_submit_transfer (lut);
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if (ret < 0) {
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LOG(ERR) << "submit_lut " << ret;
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return false;
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}
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pending_add(lut);
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return true;
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}
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/*
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* Reimplementing _reap for context use and compatibiliy with libusb-0.12.
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*
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* Returns false on timeout or error, true if an event was handled
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*
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* If ok_to_block_p is false then handle already pending events and return
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* immediately.
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*
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* If ok_to_block_p is true then call libusb_handle_events_timeout with default
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* timeout value of 2 seconds, which waits and returns on event arrival or
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* timeout.
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*/
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bool
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fusb_devhandle::_reap (bool ok_to_block_p)
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{
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int ret;
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struct timeval tv;
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// Save pending size
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int pnd_size = d_pending_rqsts.size();
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if (ok_to_block_p) {
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tv.tv_sec = 2;
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tv.tv_usec = 0;
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}
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else {
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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}
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if ((ret = libusb_handle_events_timeout(d_ctx, &tv)) < 0) {
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LOG(ERR) << "libusb_handle_events_timeout returned " << ret;
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return false;
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}
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// Check that a pending transfer was removed
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if (pnd_size > d_pending_rqsts.size())
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return true;
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else {
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return false;
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}
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}
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// ------------------------------------------------------------------------
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// endpoint handle
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// ------------------------------------------------------------------------
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fusb_ephandle::fusb_ephandle(fusb_devhandle *dh,
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int endpoint, bool input_p,
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int block_size, int nblocks)
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: d_endpoint(endpoint), d_input_p(input_p), d_block_size(block_size), d_nblocks(nblocks), d_started(false),
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d_devhandle (dh),
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d_write_work_in_progress (0), d_write_buffer (0),
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d_read_work_in_progress (0), d_read_buffer (0), d_read_buffer_end (0)
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{
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if (d_block_size < 0 || d_block_size > MAX_BLOCK_SIZE)
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throw std::out_of_range ("fusb_ephandle_libusb1: block_size");
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if (d_nblocks < 0)
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throw std::out_of_range ("fusb_ephandle_libusb1: nblocks");
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if (d_block_size == 0)
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d_block_size = DEFAULT_BLOCK_SIZE;
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if (d_nblocks == 0)
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d_nblocks = std::max (1, DEFAULT_BUFFER_SIZE / d_block_size);
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// allocate libusb_transfers
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for (int i = 0; i < d_nblocks; i++)
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d_free_list.push_back (alloc_lut (this, d_block_size, d_endpoint,
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d_input_p, d_write_buffer, d_devhandle));
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}
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fusb_ephandle::~fusb_ephandle ()
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{
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libusb_transfer *lut;
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while ((lut = free_list_get ()) != 0)
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free_lut (lut);
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while ((lut = completed_list_get ()) != 0)
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free_lut (lut);
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if (d_write_work_in_progress)
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free_lut (d_write_work_in_progress);
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delete [] d_write_buffer;
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if (d_read_work_in_progress)
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free_lut (d_read_work_in_progress);
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}
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bool
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fusb_ephandle::start ()
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{
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if (d_started)
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return true;
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d_started = true;
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if (d_input_p) {
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libusb_transfer *lut;
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int nerrors = 0;
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while ((lut = free_list_get ()) !=0 && nerrors < d_nblocks) {
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if (!submit_lut (lut))
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nerrors++;
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}
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}
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return true;
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}
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/*
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* Cancel all transfers in progress or pending and return to initial state
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*/
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// ------------------------------------------------------------------------
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// routines for writing
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// ------------------------------------------------------------------------
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int
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fusb_ephandle::write (const void *buffer, int nbytes)
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{
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if (!d_started) // doesn't matter here, but keeps semantics constant
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return -1;
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if (d_input_p)
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return -1;
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assert(nbytes % 512 == 0);
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unsigned char *src = (unsigned char *) buffer;
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int n = 0;
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while (n < nbytes){
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struct libusb_transfer *lut = get_write_work_in_progress();
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if (!lut)
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return -1;
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assert(lut->actual_length == 0);
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int m = std::min(nbytes - n, MAX_BLOCK_SIZE);
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lut->buffer = src;
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lut->length = m;
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n += m;
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src += m;
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if (!submit_lut(lut))
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return -1;
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d_write_work_in_progress = 0;
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}
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return n;
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}
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struct libusb_transfer *
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fusb_ephandle::get_write_work_in_progress ()
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{
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if (d_write_work_in_progress)
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return d_write_work_in_progress;
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while (1) {
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reap_complete_writes ();
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struct libusb_transfer *lut = free_list_get ();
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if (lut != 0){
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assert (lut->actual_length == 0);
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d_write_work_in_progress = lut;
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return lut;
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}
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if (!d_devhandle->_reap (true))
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return 0;
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}
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}
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void
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fusb_ephandle::reap_complete_writes ()
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{
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// take a look at the completed list and xfer to free list after
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// checking for errors.
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libusb_transfer *lut;
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while ((lut = completed_list_get ()) != 0) {
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// Check for any errors or short writes that were reporetd in the transfer.
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// libusb1 sets status, actual_length.
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if (lut->status != LIBUSB_TRANSFER_COMPLETED) {
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LOG(ERR) << "Invalid LUT status " << lut->status;
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}
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else if (lut->actual_length != lut->length){
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LOG(ERR) << "Improper write of " << lut->actual_length;
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}
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free_list_add (lut);
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}
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}
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// ------------------------------------------------------------------------
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// routines for reading
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// ------------------------------------------------------------------------
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int
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fusb_ephandle::read (void *buffer, int nbytes)
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{
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if (!d_started) // doesn't matter here, but keeps semantics constant
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return -1;
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if (!d_input_p)
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return -1;
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unsigned char *dst = (unsigned char *) buffer;
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int n = 0;
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while (n < nbytes) {
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if (d_read_buffer >= d_read_buffer_end)
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if (!reload_read_buffer ())
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return -1;
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int m = std::min (nbytes - n, (int) (d_read_buffer_end - d_read_buffer));
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memcpy (&dst[n], d_read_buffer, m);
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d_read_buffer += m;
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n += m;
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}
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return n;
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}
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bool
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fusb_ephandle::reload_read_buffer ()
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{
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assert (d_read_buffer >= d_read_buffer_end);
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libusb_transfer *lut;
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if (d_read_work_in_progress) {
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lut = d_read_work_in_progress;
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d_read_work_in_progress = 0;
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d_read_buffer = 0;
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d_read_buffer_end = 0;
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lut->actual_length = 0;
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if (!submit_lut (lut)) {
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LOG(ERR) << "Improper LUT submission";
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return false;
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}
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}
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while (1) {
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while ((lut = completed_list_get ()) == 0 )
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if (!d_devhandle->_reap(true))
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{
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LOG(ERR) << "No libusb events";
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return false;
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}
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if (lut->status != LIBUSB_TRANSFER_COMPLETED) {
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LOG(ERR) << "Improper read status " << lut->status;
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lut->actual_length = 0;
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free_list_add (lut);
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return false;
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}
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d_read_work_in_progress = lut;
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d_read_buffer = (unsigned char *) lut->buffer;
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d_read_buffer_end = d_read_buffer + lut->actual_length;
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return true;
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}
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}
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/*
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* ephandle list manipulation
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*/
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void
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fusb_ephandle::free_list_add (libusb_transfer *lut)
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{
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assert ((lut->user_data) == this);
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lut->actual_length = 0;
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d_free_list.push_back (lut);
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}
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libusb_transfer *
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fusb_ephandle::free_list_get ()
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{
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if (d_free_list.empty ())
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return 0;
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libusb_transfer *lut = d_free_list.front ();
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d_free_list.pop_front ();
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return lut;
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}
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void
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fusb_ephandle::completed_list_add (libusb_transfer *lut)
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{
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assert ((lut->user_data) == this);
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d_completed_list.push_back (lut);
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}
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libusb_transfer *
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fusb_ephandle::completed_list_get ()
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{
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if (d_completed_list.empty ())
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return 0;
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libusb_transfer *lut = d_completed_list.front ();
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d_completed_list.pop_front ();
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return lut;
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}
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bool
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fusb_ephandle::submit_lut (libusb_transfer *lut)
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{
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if (!d_devhandle->_submit_lut (lut)) {
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LOG(ERR) << "USB submission failed";
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free_list_add (lut);
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return false;
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}
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return true;
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}
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