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/*
* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <string.h>
#include <errno.h>
#include <ipxe/usb.h>
#include <ipxe/usbnet.h>
/** @file
*
* USB network devices
*
* USB network devices use a variety of packet formats and interface
* descriptors, but tend to have several features in common:
*
* - a single interrupt endpoint using the generic refill mechanism
*
* - a single bulk IN endpoint using the generic refill mechanism
*
* - a single bulk OUT endpoint
*
* - optional use of an alternate setting to enable the data interface
*
*/
/**
* Open USB network device
*
* @v usbnet USB network device
* @ret rc Return status code
*/
int usbnet_open ( struct usbnet_device *usbnet ) {
struct usb_device *usb = usbnet->func->usb;
int rc;
/* Open interrupt endpoint */
if ( ( rc = usb_endpoint_open ( &usbnet->intr ) ) != 0 ) {
DBGC ( usbnet, "USBNET %s could not open interrupt: %s\n",
usbnet->func->name, strerror ( rc ) );
goto err_open_intr;
}
/* Refill interrupt endpoint */
if ( ( rc = usb_refill ( &usbnet->intr ) ) != 0 ) {
DBGC ( usbnet, "USBNET %s could not refill interrupt: %s\n",
usbnet->func->name, strerror ( rc ) );
goto err_refill_intr;
}
/* Select alternate setting for data interface, if applicable */
if ( usbnet->alternate &&
( ( rc = usb_set_interface ( usb, usbnet->data,
usbnet->alternate ) ) != 0 ) ) {
DBGC ( usbnet, "USBNET %s could not set alternate interface "
"%d: %s\n", usbnet->func->name, usbnet->alternate,
strerror ( rc ) );
goto err_set_interface;
}
/* Open bulk IN endpoint */
if ( ( rc = usb_endpoint_open ( &usbnet->in ) ) != 0 ) {
DBGC ( usbnet, "USBNET %s could not open bulk IN: %s\n",
usbnet->func->name, strerror ( rc ) );
goto err_open_in;
}
/* Open bulk OUT endpoint */
if ( ( rc = usb_endpoint_open ( &usbnet->out ) ) != 0 ) {
DBGC ( usbnet, "USBNET %s could not open bulk OUT: %s\n",
usbnet->func->name, strerror ( rc ) );
goto err_open_out;
}
/* Refill bulk IN endpoint */
if ( ( rc = usb_refill ( &usbnet->in ) ) != 0 ) {
DBGC ( usbnet, "USBNET %s could not refill bulk IN: %s\n",
usbnet->func->name, strerror ( rc ) );
goto err_refill_in;
}
return 0;
err_refill_in:
usb_endpoint_close ( &usbnet->out );
err_open_out:
usb_endpoint_close ( &usbnet->in );
err_open_in:
if ( usbnet->alternate )
usb_set_interface ( usb, usbnet->data, 0 );
err_set_interface:
err_refill_intr:
usb_endpoint_close ( &usbnet->intr );
err_open_intr:
return rc;
}
/**
* Close USB network device
*
* @v usbnet USB network device
*/
void usbnet_close ( struct usbnet_device *usbnet ) {
struct usb_device *usb = usbnet->func->usb;
/* Close bulk OUT endpoint */
usb_endpoint_close ( &usbnet->out );
/* Close bulk IN endpoint */
usb_endpoint_close ( &usbnet->in );
/* Reset alternate setting for data interface, if applicable */
if ( usbnet->alternate )
usb_set_interface ( usb, usbnet->data, 0 );
/* Close interrupt endpoint */
usb_endpoint_close ( &usbnet->intr );
}
/**
* Refill USB network device bulk IN and interrupt endpoints
*
* @v usbnet USB network device
* @ret rc Return status code
*/
int usbnet_refill ( struct usbnet_device *usbnet ) {
int rc;
/* Refill bulk IN endpoint */
if ( ( rc = usb_refill ( &usbnet->in ) ) != 0 )
return rc;
/* Refill interrupt endpoint */
if ( ( rc = usb_refill ( &usbnet->intr ) ) != 0 )
return rc;
return 0;
}
/**
* Describe communications interface and interrupt endpoint
*
* @v usbnet USB network device
* @v config Configuration descriptor
* @ret rc Return status code
*/
static int usbnet_comms_describe ( struct usbnet_device *usbnet,
struct usb_configuration_descriptor *config){
struct usb_interface_descriptor *desc;
unsigned int comms;
unsigned int i;
int rc;
/* Iterate over all available interfaces */
for ( i = 0 ; i < usbnet->func->count ; i++ ) {
/* Get interface number */
comms = usbnet->func->interface[i];
/* Locate interface descriptor */
desc = usb_interface_descriptor ( config, comms, 0 );
if ( ! desc )
continue;
/* Describe interrupt endpoint */
if ( ( rc = usb_endpoint_described ( &usbnet->intr, config,
desc, USB_INTERRUPT_IN,
0 ) ) != 0 )
continue;
/* Record communications interface */
usbnet->comms = comms;
DBGC ( usbnet, "USBNET %s found communications interface %d\n",
usbnet->func->name, comms );
return 0;
}
DBGC ( usbnet, "USBNET %s found no communications interface\n",
usbnet->func->name );
return -ENOENT;
}
/**
* Describe data interface and bulk endpoints
*
* @v usbnet USB network device
* @v config Configuration descriptor
* @ret rc Return status code
*/
static int usbnet_data_describe ( struct usbnet_device *usbnet,
struct usb_configuration_descriptor *config ){
struct usb_interface_descriptor *desc;
unsigned int data;
unsigned int alt;
unsigned int i;
int rc;
/* Iterate over all available interfaces */
for ( i = 0 ; i < usbnet->func->count ; i++ ) {
/* Get interface number */
data = usbnet->func->interface[i];
/* Iterate over all existent alternate settings */
for ( alt = 0 ; ; alt++ ) {
/* Locate interface descriptor */
desc = usb_interface_descriptor ( config, data, alt );
if ( ! desc )
break;
/* Describe bulk IN endpoint */
if ( ( rc = usb_endpoint_described ( &usbnet->in,
config, desc,
USB_BULK_IN,
0 ) ) != 0 )
continue;
/* Describe bulk OUT endpoint */
if ( ( rc = usb_endpoint_described ( &usbnet->out,
config, desc,
USB_BULK_OUT,
0 ) ) != 0 )
continue;
/* Record data interface and alternate setting */
usbnet->data = data;
usbnet->alternate = alt;
DBGC ( usbnet, "USBNET %s found data interface %d",
usbnet->func->name, data );
if ( alt )
DBGC ( usbnet, " using alternate %d", alt );
DBGC ( usbnet, "\n" );
return 0;
}
}
DBGC ( usbnet, "USBNET %s found no data interface\n",
usbnet->func->name );
return -ENOENT;
}
/**
* Describe USB network device interfaces
*
* @v usbnet USB network device
* @v config Configuration descriptor
* @ret rc Return status code
*/
int usbnet_describe ( struct usbnet_device *usbnet,
struct usb_configuration_descriptor *config ) {
int rc;
/* Describe communications interface */
if ( ( rc = usbnet_comms_describe ( usbnet, config ) ) != 0 )
return rc;
/* Describe data interface */
if ( ( rc = usbnet_data_describe ( usbnet, config ) ) != 0 )
return rc;
return 0;
}
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