mirror of https://github.com/ipxe/ipxe.git
[usb] Add generic USB network device framework
Signed-off-by: Michael Brown <mcb30@ipxe.org>pull/34/head
Michael Brown
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21d3d5c47c
commit
a92fb8d9a5
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@ -0,0 +1,280 @@
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/*
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* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <string.h>
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#include <errno.h>
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#include <ipxe/usb.h>
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#include <ipxe/usbnet.h>
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/** @file
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*
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* USB network devices
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*
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* USB network devices use a variety of packet formats and interface
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* descriptors, but tend to have several features in common:
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*
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* - a single interrupt endpoint using the generic refill mechanism
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*
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* - a single bulk IN endpoint using the generic refill mechanism
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*
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* - a single bulk OUT endpoint
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*
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* - optional use of an alternate setting to enable the data interface
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*
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*/
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/**
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* Open USB network device
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*
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* @v usbnet USB network device
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* @ret rc Return status code
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*/
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int usbnet_open ( struct usbnet_device *usbnet ) {
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struct usb_device *usb = usbnet->func->usb;
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int rc;
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/* Open interrupt endpoint */
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if ( ( rc = usb_endpoint_open ( &usbnet->intr ) ) != 0 ) {
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DBGC ( usbnet, "USBNET %s could not open interrupt: %s\n",
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usbnet->func->name, strerror ( rc ) );
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goto err_open_intr;
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}
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/* Refill interrupt endpoint */
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if ( ( rc = usb_refill ( &usbnet->intr ) ) != 0 ) {
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DBGC ( usbnet, "USBNET %s could not refill interrupt: %s\n",
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usbnet->func->name, strerror ( rc ) );
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goto err_refill_intr;
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}
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/* Select alternate setting for data interface, if applicable */
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if ( usbnet->alternate &&
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( ( rc = usb_set_interface ( usb, usbnet->data,
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usbnet->alternate ) ) != 0 ) ) {
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DBGC ( usbnet, "USBNET %s could not set alternate interface "
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"%d: %s\n", usbnet->func->name, usbnet->alternate,
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strerror ( rc ) );
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goto err_set_interface;
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}
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/* Open bulk IN endpoint */
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if ( ( rc = usb_endpoint_open ( &usbnet->in ) ) != 0 ) {
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DBGC ( usbnet, "USBNET %s could not open bulk IN: %s\n",
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usbnet->func->name, strerror ( rc ) );
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goto err_open_in;
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}
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/* Open bulk OUT endpoint */
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if ( ( rc = usb_endpoint_open ( &usbnet->out ) ) != 0 ) {
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DBGC ( usbnet, "USBNET %s could not open bulk OUT: %s\n",
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usbnet->func->name, strerror ( rc ) );
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goto err_open_out;
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}
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/* Refill bulk IN endpoint */
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if ( ( rc = usb_refill ( &usbnet->in ) ) != 0 ) {
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DBGC ( usbnet, "USBNET %s could not refill bulk IN: %s\n",
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usbnet->func->name, strerror ( rc ) );
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goto err_refill_in;
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}
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return 0;
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err_refill_in:
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usb_endpoint_close ( &usbnet->out );
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err_open_out:
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usb_endpoint_close ( &usbnet->in );
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err_open_in:
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if ( usbnet->alternate )
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usb_set_interface ( usb, usbnet->data, 0 );
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err_set_interface:
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err_refill_intr:
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usb_endpoint_close ( &usbnet->intr );
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err_open_intr:
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return rc;
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}
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/**
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* Close USB network device
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*
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* @v usbnet USB network device
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*/
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void usbnet_close ( struct usbnet_device *usbnet ) {
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struct usb_device *usb = usbnet->func->usb;
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/* Close bulk OUT endpoint */
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usb_endpoint_close ( &usbnet->out );
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/* Close bulk IN endpoint */
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usb_endpoint_close ( &usbnet->in );
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/* Reset alternate setting for data interface, if applicable */
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if ( usbnet->alternate )
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usb_set_interface ( usb, usbnet->data, 0 );
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/* Close interrupt endpoint */
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usb_endpoint_close ( &usbnet->intr );
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}
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/**
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* Refill USB network device bulk IN and interrupt endpoints
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*
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* @v usbnet USB network device
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* @ret rc Return status code
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*/
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int usbnet_refill ( struct usbnet_device *usbnet ) {
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int rc;
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/* Refill bulk IN endpoint */
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if ( ( rc = usb_refill ( &usbnet->in ) ) != 0 )
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return rc;
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/* Refill interrupt endpoint */
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if ( ( rc = usb_refill ( &usbnet->intr ) ) != 0 )
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return rc;
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return 0;
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}
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/**
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* Describe communications interface and interrupt endpoint
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*
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* @v usbnet USB network device
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* @v config Configuration descriptor
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* @ret rc Return status code
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*/
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static int usbnet_comms_describe ( struct usbnet_device *usbnet,
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struct usb_configuration_descriptor *config){
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struct usb_interface_descriptor *desc;
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unsigned int comms;
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unsigned int i;
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int rc;
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/* Iterate over all available interfaces */
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for ( i = 0 ; i < usbnet->func->count ; i++ ) {
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/* Get interface number */
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comms = usbnet->func->interface[i];
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/* Locate interface descriptor */
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desc = usb_interface_descriptor ( config, comms, 0 );
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if ( ! desc )
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continue;
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/* Describe interrupt endpoint */
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if ( ( rc = usb_endpoint_described ( &usbnet->intr, config,
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desc, USB_INTERRUPT,
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0 ) ) != 0 )
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continue;
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/* Record communications interface */
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usbnet->comms = comms;
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DBGC ( usbnet, "USBNET %s found communications interface %d\n",
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usbnet->func->name, comms );
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return 0;
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}
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DBGC ( usbnet, "USBNET %s found no communications interface\n",
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usbnet->func->name );
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return -ENOENT;
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}
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/**
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* Describe data interface and bulk endpoints
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*
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* @v usbnet USB network device
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* @v config Configuration descriptor
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* @ret rc Return status code
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*/
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static int usbnet_data_describe ( struct usbnet_device *usbnet,
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struct usb_configuration_descriptor *config ){
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struct usb_interface_descriptor *desc;
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unsigned int data;
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unsigned int alt;
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unsigned int i;
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int rc;
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/* Iterate over all available interfaces */
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for ( i = 0 ; i < usbnet->func->count ; i++ ) {
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/* Get interface number */
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data = usbnet->func->interface[i];
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/* Iterate over all existent alternate settings */
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for ( alt = 0 ; ; alt++ ) {
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/* Locate interface descriptor */
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desc = usb_interface_descriptor ( config, data, alt );
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if ( ! desc )
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break;
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/* Describe bulk IN endpoint */
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if ( ( rc = usb_endpoint_described ( &usbnet->in,
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config, desc,
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USB_BULK_IN,
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0 ) ) != 0 )
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continue;
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/* Describe bulk OUT endpoint */
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if ( ( rc = usb_endpoint_described ( &usbnet->out,
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config, desc,
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USB_BULK_OUT,
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0 ) ) != 0 )
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continue;
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/* Record data interface and alternate setting */
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usbnet->data = data;
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usbnet->alternate = alt;
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DBGC ( usbnet, "USBNET %s found data interface %d",
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usbnet->func->name, data );
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if ( alt )
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DBGC ( usbnet, " using alternate %d", alt );
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DBGC ( usbnet, "\n" );
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return 0;
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}
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}
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DBGC ( usbnet, "USBNET %s found no data interface\n",
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usbnet->func->name );
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return -ENOENT;
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}
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/**
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* Describe USB network device interfaces
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*
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* @v usbnet USB network device
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* @v config Configuration descriptor
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* @ret rc Return status code
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*/
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int usbnet_describe ( struct usbnet_device *usbnet,
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struct usb_configuration_descriptor *config ) {
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int rc;
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/* Describe communications interface */
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if ( ( rc = usbnet_comms_describe ( usbnet, config ) ) != 0 )
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return rc;
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/* Describe data interface */
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if ( ( rc = usbnet_data_describe ( usbnet, config ) ) != 0 )
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return rc;
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return 0;
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}
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@ -163,6 +163,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
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#define ERRFILE_netvsc ( ERRFILE_DRIVER | 0x006b0000 )
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#define ERRFILE_ecm ( ERRFILE_DRIVER | 0x006c0000 )
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#define ERRFILE_ncm ( ERRFILE_DRIVER | 0x006d0000 )
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#define ERRFILE_usbnet ( ERRFILE_DRIVER | 0x006e0000 )
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#define ERRFILE_scsi ( ERRFILE_DRIVER | 0x00700000 )
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#define ERRFILE_arbel ( ERRFILE_DRIVER | 0x00710000 )
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@ -0,0 +1,62 @@
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#ifndef _IPXE_USBNET_H
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#define _IPXE_USBNET_H
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/** @file
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*
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* USB network devices
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <ipxe/usb.h>
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/** A USB network device */
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struct usbnet_device {
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/** USB function */
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struct usb_function *func;
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/** Communications interface */
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unsigned int comms;
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/** Data interface */
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unsigned int data;
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/** Alternate setting for data interface */
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unsigned int alternate;
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/** Interrupt endpoint */
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struct usb_endpoint intr;
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/** Bulk IN endpoint */
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struct usb_endpoint in;
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/** Bulk OUT endpoint */
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struct usb_endpoint out;
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};
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/**
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* Initialise USB network device
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*
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* @v usbnet USB network device
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* @v func USB function
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* @v intr Interrupt endpoint operations
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* @v in Bulk IN endpoint operations
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* @v out Bulk OUT endpoint operations
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*/
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static inline __attribute__ (( always_inline )) void
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usbnet_init ( struct usbnet_device *usbnet, struct usb_function *func,
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struct usb_endpoint_driver_operations *intr,
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struct usb_endpoint_driver_operations *in,
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struct usb_endpoint_driver_operations *out ) {
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struct usb_device *usb = func->usb;
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usbnet->func = func;
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usb_endpoint_init ( &usbnet->intr, usb, intr );
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usb_endpoint_init ( &usbnet->in, usb, in );
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usb_endpoint_init ( &usbnet->out, usb, out );
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}
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extern int usbnet_open ( struct usbnet_device *usbnet );
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extern void usbnet_close ( struct usbnet_device *usbnet );
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extern int usbnet_refill ( struct usbnet_device *usbnet );
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extern int usbnet_describe ( struct usbnet_device *usbnet,
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struct usb_configuration_descriptor *config );
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#endif /* _IPXE_USBNET_H */
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