171 lines
4.7 KiB
C
171 lines
4.7 KiB
C
/* $FreeBSD$ */
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/*-
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* Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <dev/usb/usb_mfunc.h>
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#include <dev/usb/usb.h>
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#include <dev/usb/usb_error.h>
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#include <dev/usb/usb_defs.h>
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#define USB_DEBUG_VAR usb2_debug
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#include <dev/usb/usb_core.h>
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#include <dev/usb/usb_process.h>
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#include <dev/usb/usb_busdma.h>
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#include <dev/usb/usb_transfer.h>
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#include <dev/usb/usb_sw_transfer.h>
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#include <dev/usb/usb_device.h>
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#include <dev/usb/usb_debug.h>
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#include <dev/usb/usb_controller.h>
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#include <dev/usb/usb_bus.h>
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/*------------------------------------------------------------------------*
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* usb2_sw_transfer - factored out code
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*
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* This function is basically used for the Virtual Root HUB, and can
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* emulate control, bulk and interrupt endpoints. Data is exchanged
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* using the "std->ptr" and "std->len" fields, that allows kernel
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* virtual memory to be transferred. All state is kept in the
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* structure pointed to by the "std" argument passed to this
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* function. The "func" argument points to a function that is called
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* back in the various states, so that the application using this
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* function can get a chance to select the outcome. The "func"
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* function is allowed to sleep, exiting all mutexes. If this function
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* will sleep the "enter" and "start" methods must be marked
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* non-cancelable, hence there is no extra cancelled checking in this
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* function.
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*------------------------------------------------------------------------*/
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void
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usb2_sw_transfer(struct usb2_sw_transfer *std,
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usb2_sw_transfer_func_t *func)
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{
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struct usb2_xfer *xfer;
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uint32_t len;
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uint8_t shortpkt = 0;
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xfer = std->xfer;
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if (xfer == NULL) {
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/* the transfer is gone */
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DPRINTF("xfer gone\n");
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return;
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}
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USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
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std->xfer = NULL;
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/* check for control transfer */
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if (xfer->flags_int.control_xfr) {
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/* check if we are transferring the SETUP packet */
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if (xfer->flags_int.control_hdr) {
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/* copy out the USB request */
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if (xfer->frlengths[0] == sizeof(std->req)) {
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usb2_copy_out(xfer->frbuffers, 0,
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&std->req, sizeof(std->req));
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} else {
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std->err = USB_ERR_INVAL;
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goto done;
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}
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xfer->aframes = 1;
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std->err = 0;
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std->state = USB_SW_TR_SETUP;
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(func) (xfer, std);
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if (std->err) {
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goto done;
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}
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} else {
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/* skip the first frame in this case */
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xfer->aframes = 1;
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}
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}
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std->err = 0;
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std->state = USB_SW_TR_PRE_DATA;
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(func) (xfer, std);
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if (std->err) {
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goto done;
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}
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/* Transfer data. Iterate accross all frames. */
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while (xfer->aframes != xfer->nframes) {
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len = xfer->frlengths[xfer->aframes];
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if (len > std->len) {
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len = std->len;
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shortpkt = 1;
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}
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if (len > 0) {
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if ((xfer->endpoint & (UE_DIR_IN | UE_DIR_OUT)) == UE_DIR_IN) {
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usb2_copy_in(xfer->frbuffers + xfer->aframes, 0,
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std->ptr, len);
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} else {
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usb2_copy_out(xfer->frbuffers + xfer->aframes, 0,
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std->ptr, len);
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}
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}
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std->ptr += len;
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std->len -= len;
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xfer->frlengths[xfer->aframes] = len;
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xfer->aframes++;
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if (shortpkt) {
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break;
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}
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}
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std->err = 0;
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std->state = USB_SW_TR_POST_DATA;
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(func) (xfer, std);
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if (std->err) {
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goto done;
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}
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/* check if the control transfer is complete */
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if (xfer->flags_int.control_xfr &&
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!xfer->flags_int.control_act) {
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std->err = 0;
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std->state = USB_SW_TR_STATUS;
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(func) (xfer, std);
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if (std->err) {
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goto done;
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}
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}
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done:
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DPRINTF("done err=%s\n", usb2_errstr(std->err));
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std->state = USB_SW_TR_PRE_CALLBACK;
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(func) (xfer, std);
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}
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