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BVK Chaitanya
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810 changed files with 4980 additions and 2508 deletions
212
grub-core/bus/usb/usbtrans.c
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212
grub-core/bus/usb/usbtrans.c
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/* usbtrans.c - USB Transfers and Transactions. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/usb.h>
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#include <grub/usbtrans.h>
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grub_usb_err_t
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grub_usb_control_msg (grub_usb_device_t dev,
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grub_uint8_t reqtype,
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grub_uint8_t request,
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grub_uint16_t value,
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grub_uint16_t index,
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grub_size_t size, char *data)
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{
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int i;
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grub_usb_transfer_t transfer;
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int datablocks;
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struct grub_usb_packet_setup setupdata;
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grub_usb_err_t err;
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unsigned int max;
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grub_dprintf ("usb",
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"control: reqtype=0x%02x req=0x%02x val=0x%02x idx=0x%02x size=%d\n",
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reqtype, request, value, index, size);
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/* Create a transfer. */
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transfer = grub_malloc (sizeof (struct grub_usb_transfer));
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if (! transfer)
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return grub_errno;
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/* Determine the maximum packet size. */
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if (dev->initialized)
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max = dev->descdev.maxsize0;
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else
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max = 64;
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datablocks = (size + max - 1) / max;
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/* XXX: Discriminate between different types of control
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messages. */
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transfer->transcnt = datablocks + 2;
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transfer->size = size; /* XXX ? */
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transfer->endpoint = 0;
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transfer->devaddr = dev->addr;
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transfer->type = GRUB_USB_TRANSACTION_TYPE_CONTROL;
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transfer->max = max;
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transfer->dev = dev;
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/* Allocate an array of transfer data structures. */
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transfer->transactions = grub_malloc (transfer->transcnt
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* sizeof (struct grub_usb_transfer));
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if (! transfer->transactions)
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{
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grub_free (transfer);
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return grub_errno;
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}
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/* Build a Setup packet. XXX: Endianness. */
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setupdata.reqtype = reqtype;
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setupdata.request = request;
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setupdata.value = value;
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setupdata.index = index;
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setupdata.length = size;
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transfer->transactions[0].size = sizeof (setupdata);
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transfer->transactions[0].pid = GRUB_USB_TRANSFER_TYPE_SETUP;
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transfer->transactions[0].data = (char *) &setupdata;
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transfer->transactions[0].toggle = 0;
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/* Now the data... XXX: Is this the right way to transfer control
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transfers? */
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for (i = 0; i < datablocks; i++)
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{
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grub_usb_transaction_t tr = &transfer->transactions[i + 1];
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tr->size = (size > max) ? max : size;
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/* Use the right most bit as the data toggle. Simple and
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effective. */
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tr->toggle = !(i & 1);
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if (reqtype & 128)
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tr->pid = GRUB_USB_TRANSFER_TYPE_IN;
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else
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tr->pid = GRUB_USB_TRANSFER_TYPE_OUT;
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tr->data = &data[i * max];
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size -= max;
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}
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/* End with an empty OUT transaction. */
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transfer->transactions[datablocks + 1].size = 0;
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transfer->transactions[datablocks + 1].data = NULL;
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if (reqtype & 128)
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transfer->transactions[datablocks + 1].pid = GRUB_USB_TRANSFER_TYPE_OUT;
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else
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transfer->transactions[datablocks + 1].pid = GRUB_USB_TRANSFER_TYPE_IN;
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transfer->transactions[datablocks + 1].toggle = 1;
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err = dev->controller.dev->transfer (&dev->controller, transfer);
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grub_free (transfer->transactions);
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grub_free (transfer);
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return err;
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}
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static grub_usb_err_t
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grub_usb_bulk_readwrite (grub_usb_device_t dev,
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int endpoint, grub_size_t size, char *data,
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grub_transfer_type_t type)
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{
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int i;
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grub_usb_transfer_t transfer;
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int datablocks;
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unsigned int max;
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grub_usb_err_t err;
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int toggle = dev->toggle[endpoint];
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/* Use the maximum packet size given in the endpoint descriptor. */
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if (dev->initialized)
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{
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struct grub_usb_desc_endp *endpdesc;
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endpdesc = grub_usb_get_endpdescriptor (dev, 0);
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if (endpdesc)
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max = endpdesc->maxpacket;
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else
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max = 64;
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}
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else
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max = 64;
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/* Create a transfer. */
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transfer = grub_malloc (sizeof (struct grub_usb_transfer));
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if (! transfer)
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return grub_errno;
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datablocks = ((size + max - 1) / max);
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transfer->transcnt = datablocks;
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transfer->size = size - 1;
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transfer->endpoint = endpoint;
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transfer->devaddr = dev->addr;
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transfer->type = GRUB_USB_TRANSACTION_TYPE_BULK;
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transfer->max = max;
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transfer->dev = dev;
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/* Allocate an array of transfer data structures. */
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transfer->transactions = grub_malloc (transfer->transcnt
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* sizeof (struct grub_usb_transfer));
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if (! transfer->transactions)
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{
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grub_free (transfer);
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return grub_errno;
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}
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/* Set up all transfers. */
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for (i = 0; i < datablocks; i++)
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{
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grub_usb_transaction_t tr = &transfer->transactions[i];
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tr->size = (size > max) ? max : size;
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/* XXX: Use the right most bit as the data toggle. Simple and
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effective. */
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tr->toggle = toggle;
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toggle = toggle ? 0 : 1;
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tr->pid = type;
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tr->data = &data[i * max];
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size -= tr->size;
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}
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err = dev->controller.dev->transfer (&dev->controller, transfer);
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grub_dprintf ("usb", "toggle=%d\n", toggle);
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dev->toggle[endpoint] = toggle;
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grub_free (transfer->transactions);
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grub_free (transfer);
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return err;
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}
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grub_usb_err_t
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grub_usb_bulk_write (grub_usb_device_t dev,
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int endpoint, grub_size_t size, char *data)
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{
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return grub_usb_bulk_readwrite (dev, endpoint, size, data,
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GRUB_USB_TRANSFER_TYPE_OUT);
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}
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grub_usb_err_t
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grub_usb_bulk_read (grub_usb_device_t dev,
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int endpoint, grub_size_t size, char *data)
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{
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return grub_usb_bulk_readwrite (dev, endpoint, size, data,
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GRUB_USB_TRANSFER_TYPE_IN);
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}
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