diff options
Diffstat (limited to 'sys/dev/usb/usb_sw_transfer.c')
| -rw-r--r-- | sys/dev/usb/usb_sw_transfer.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/sys/dev/usb/usb_sw_transfer.c b/sys/dev/usb/usb_sw_transfer.c new file mode 100644 index 0000000..984c233 --- /dev/null +++ b/sys/dev/usb/usb_sw_transfer.c @@ -0,0 +1,170 @@ +/* $FreeBSD$ */ +/*- + * Copyright (c) 2008 Hans Petter Selasky. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <dev/usb/usb_mfunc.h> +#include <dev/usb/usb.h> +#include <dev/usb/usb_error.h> +#include <dev/usb/usb_defs.h> + +#define USB_DEBUG_VAR usb2_debug + +#include <dev/usb/usb_core.h> +#include <dev/usb/usb_process.h> +#include <dev/usb/usb_busdma.h> +#include <dev/usb/usb_transfer.h> +#include <dev/usb/usb_sw_transfer.h> +#include <dev/usb/usb_device.h> +#include <dev/usb/usb_debug.h> + +#include <dev/usb/usb_controller.h> +#include <dev/usb/usb_bus.h> + +/*------------------------------------------------------------------------* + * usb2_sw_transfer - factored out code + * + * This function is basically used for the Virtual Root HUB, and can + * emulate control, bulk and interrupt endpoints. Data is exchanged + * using the "std->ptr" and "std->len" fields, that allows kernel + * virtual memory to be transferred. All state is kept in the + * structure pointed to by the "std" argument passed to this + * function. The "func" argument points to a function that is called + * back in the various states, so that the application using this + * function can get a chance to select the outcome. The "func" + * function is allowed to sleep, exiting all mutexes. If this function + * will sleep the "enter" and "start" methods must be marked + * non-cancelable, hence there is no extra cancelled checking in this + * function. + *------------------------------------------------------------------------*/ +void +usb2_sw_transfer(struct usb2_sw_transfer *std, + usb2_sw_transfer_func_t *func) +{ + struct usb2_xfer *xfer; + uint32_t len; + uint8_t shortpkt = 0; + + xfer = std->xfer; + if (xfer == NULL) { + /* the transfer is gone */ + DPRINTF("xfer gone\n"); + return; + } + USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED); + + std->xfer = NULL; + + /* check for control transfer */ + if (xfer->flags_int.control_xfr) { + /* check if we are transferring the SETUP packet */ + if (xfer->flags_int.control_hdr) { + + /* copy out the USB request */ + + if (xfer->frlengths[0] == sizeof(std->req)) { + usb2_copy_out(xfer->frbuffers, 0, + &std->req, sizeof(std->req)); + } else { + std->err = USB_ERR_INVAL; + goto done; + } + + xfer->aframes = 1; + + std->err = 0; + std->state = USB_SW_TR_SETUP; + + (func) (xfer, std); + + if (std->err) { + goto done; + } + } else { + /* skip the first frame in this case */ + xfer->aframes = 1; + } + } + std->err = 0; + std->state = USB_SW_TR_PRE_DATA; + + (func) (xfer, std); + + if (std->err) { + goto done; + } + /* Transfer data. Iterate accross all frames. */ + while (xfer->aframes != xfer->nframes) { + + len = xfer->frlengths[xfer->aframes]; + + if (len > std->len) { + len = std->len; + shortpkt = 1; + } + if (len > 0) { + if ((xfer->endpoint & (UE_DIR_IN | UE_DIR_OUT)) == UE_DIR_IN) { + usb2_copy_in(xfer->frbuffers + xfer->aframes, 0, + std->ptr, len); + } else { + usb2_copy_out(xfer->frbuffers + xfer->aframes, 0, + std->ptr, len); + } + } + std->ptr += len; + std->len -= len; + xfer->frlengths[xfer->aframes] = len; + xfer->aframes++; + + if (shortpkt) { + break; + } + } + + std->err = 0; + std->state = USB_SW_TR_POST_DATA; + + (func) (xfer, std); + + if (std->err) { + goto done; + } + /* check if the control transfer is complete */ + if (xfer->flags_int.control_xfr && + !xfer->flags_int.control_act) { + + std->err = 0; + std->state = USB_SW_TR_STATUS; + + (func) (xfer, std); + + if (std->err) { + goto done; + } + } +done: + DPRINTF("done err=%s\n", usb2_errstr(std->err)); + std->state = USB_SW_TR_PRE_CALLBACK; + (func) (xfer, std); +} |
