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opengnsys_ipxe/src/drivers/bus/usb.c

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/*
* Copyright (C) 2014 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <byteswap.h>
#include <ipxe/usb.h>
#include <ipxe/cdc.h>
/** @file
*
* Universal Serial Bus (USB)
*
*/
/** List of USB buses */
struct list_head usb_buses = LIST_HEAD_INIT ( usb_buses );
/** List of changed ports */
static struct list_head usb_changed = LIST_HEAD_INIT ( usb_changed );
/** List of halted endpoints */
static struct list_head usb_halted = LIST_HEAD_INIT ( usb_halted );
/******************************************************************************
*
* Utility functions
*
******************************************************************************
*/
/**
* Get USB speed name (for debugging)
*
* @v speed Speed
* @ret name Speed name
*/
static inline const char * usb_speed_name ( unsigned int speed ) {
static const char *exponents[4] = { "", "k", "M", "G" };
static char buf[ 10 /* "xxxxxXbps" + NUL */ ];
unsigned int mantissa;
unsigned int exponent;
/* Extract mantissa and exponent */
mantissa = USB_SPEED_MANTISSA ( speed );
exponent = USB_SPEED_EXPONENT ( speed );
/* Name speed */
switch ( speed ) {
case USB_SPEED_NONE: return "DETACHED";
case USB_SPEED_LOW: return "low";
case USB_SPEED_FULL: return "full";
case USB_SPEED_HIGH: return "high";
case USB_SPEED_SUPER: return "super";
default:
snprintf ( buf, sizeof ( buf ), "%d%sbps",
mantissa, exponents[exponent] );
return buf;
}
}
/**
* Transcribe USB BCD-coded value (for debugging)
*
* @v bcd BCD-coded value
* @ret string Transcribed value
*/
static inline const char * usb_bcd ( uint16_t bcd ) {
static char buf[ 6 /* "xx.xx" + NUL */ ];
uint8_t high = ( bcd >> 8 );
uint8_t low = ( bcd >> 0 );
snprintf ( buf, sizeof ( buf ), "%x.%02x", high, low );
return buf;
}
/******************************************************************************
*
* USB descriptors
*
******************************************************************************
*/
/**
* Locate USB interface association descriptor
*
* @v config Configuraton descriptor
* @v first First interface number
* @ret desc Interface association descriptor, or NULL if not found
*/
static struct usb_interface_association_descriptor *
usb_interface_association_descriptor ( struct usb_configuration_descriptor
*config,
unsigned int first ) {
struct usb_interface_association_descriptor *desc;
/* Find a matching interface association descriptor */
for_each_config_descriptor ( desc, config ) {
if ( ( desc->header.type ==
USB_INTERFACE_ASSOCIATION_DESCRIPTOR ) &&
( desc->first == first ) )
return desc;
}
return NULL;
}
/**
* Locate USB interface descriptor
*
* @v config Configuraton descriptor
* @v interface Interface number
* @v alternate Alternate setting
* @ret desc Interface descriptor, or NULL if not found
*/
struct usb_interface_descriptor *
usb_interface_descriptor ( struct usb_configuration_descriptor *config,
unsigned int interface, unsigned int alternate ) {
struct usb_interface_descriptor *desc;
/* Find a matching interface descriptor */
for_each_config_descriptor ( desc, config ) {
if ( ( desc->header.type == USB_INTERFACE_DESCRIPTOR ) &&
( desc->interface == interface ) &&
( desc->alternate == alternate ) )
return desc;
}
return NULL;
}
/**
* Locate USB endpoint descriptor
*
* @v config Configuration descriptor
* @v interface Interface descriptor
* @v type Endpoint (internal) type
* @v index Endpoint index
* @ret desc Descriptor, or NULL if not found
*/
struct usb_endpoint_descriptor *
usb_endpoint_descriptor ( struct usb_configuration_descriptor *config,
struct usb_interface_descriptor *interface,
unsigned int type, unsigned int index ) {
struct usb_endpoint_descriptor *desc;
unsigned int attributes = ( type & USB_ENDPOINT_ATTR_TYPE_MASK );
unsigned int direction = ( type & USB_DIR_IN );
/* Find a matching endpoint descriptor */
for_each_interface_descriptor ( desc, config, interface ) {
if ( ( desc->header.type == USB_ENDPOINT_DESCRIPTOR ) &&
( ( desc->attributes &
USB_ENDPOINT_ATTR_TYPE_MASK ) == attributes ) &&
( ( desc->endpoint & USB_DIR_IN ) == direction ) &&
( index-- == 0 ) )
return desc;
}
return NULL;
}
/**
* Locate USB endpoint companion descriptor
*
* @v config Configuration descriptor
* @v desc Endpoint descriptor
* @ret descx Companion descriptor, or NULL if not found
*/
struct usb_endpoint_companion_descriptor *
usb_endpoint_companion_descriptor ( struct usb_configuration_descriptor *config,
struct usb_endpoint_descriptor *desc ) {
struct usb_endpoint_companion_descriptor *descx;
/* Get companion descriptor, if present */
descx = container_of ( usb_next_descriptor ( &desc->header ),
struct usb_endpoint_companion_descriptor,
header );
return ( ( usb_is_within_config ( config, &descx->header ) &&
descx->header.type == USB_ENDPOINT_COMPANION_DESCRIPTOR )
? descx : NULL );
}
/******************************************************************************
*
* USB endpoint
*
******************************************************************************
*/
/**
* Get USB endpoint name (for debugging)
*
* @v ep USB endpoint
* @ret name Endpoint name
*/
const char * usb_endpoint_name ( struct usb_endpoint *ep ) {
static char buf[ 9 /* "EPxx OUT" + NUL */ ];
unsigned int address = ep->address;
snprintf ( buf, sizeof ( buf ), "EP%d%s",
( address & USB_ENDPOINT_MAX ),
( address ?
( ( address & USB_ENDPOINT_IN ) ? " IN" : " OUT" ) : "" ));
return buf;
}
/**
* Describe USB endpoint from device configuration
*
* @v ep USB endpoint
* @v config Configuration descriptor
* @v interface Interface descriptor
* @v type Endpoint (internal) type
* @v index Endpoint index
* @ret rc Return status code
*/
int usb_endpoint_described ( struct usb_endpoint *ep,
struct usb_configuration_descriptor *config,
struct usb_interface_descriptor *interface,
unsigned int type, unsigned int index ) {
struct usb_device *usb = ep->usb;
struct usb_endpoint_descriptor *desc;
struct usb_endpoint_companion_descriptor *descx;
unsigned int sizes;
unsigned int burst;
unsigned int interval;
size_t mtu;
/* Locate endpoint descriptor */
desc = usb_endpoint_descriptor ( config, interface, type, index );
if ( ! desc )
return -ENOENT;
/* Locate companion descriptor, if any */
descx = usb_endpoint_companion_descriptor ( config, desc );
/* Calculate MTU and burst size */
sizes = le16_to_cpu ( desc->sizes );
mtu = USB_ENDPOINT_MTU ( sizes );
burst = ( descx ? descx->burst : USB_ENDPOINT_BURST ( sizes ) );
/* Calculate interval */
if ( ( type & USB_ENDPOINT_ATTR_TYPE_MASK ) ==
USB_ENDPOINT_ATTR_INTERRUPT ) {
if ( usb->speed >= USB_SPEED_HIGH ) {
/* 2^(desc->interval-1) is a microframe count */
interval = ( 1 << ( desc->interval - 1 ) );
} else {
/* desc->interval is a (whole) frame count */
interval = ( desc->interval << 3 );
}
} else {
/* desc->interval is a microframe count */
interval = desc->interval;
}
/* Describe endpoint */
usb_endpoint_describe ( ep, desc->endpoint, desc->attributes,
mtu, burst, interval );
return 0;
}
/**
* Open USB endpoint
*
* @v ep USB endpoint
* @ret rc Return status code
*/
int usb_endpoint_open ( struct usb_endpoint *ep ) {
struct usb_device *usb = ep->usb;
unsigned int idx = USB_ENDPOINT_IDX ( ep->address );
int rc;
/* Populate host controller operations */
ep->host = &usb->port->hub->bus->op->endpoint;
/* Add to endpoint list */
if ( usb->ep[idx] != NULL ) {
DBGC ( usb, "USB %s %s is already open\n",
usb->name, usb_endpoint_name ( ep ) );
rc = -EALREADY;
goto err_already;
}
usb->ep[idx] = ep;
INIT_LIST_HEAD ( &ep->halted );
/* Open endpoint */
if ( ( rc = ep->host->open ( ep ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not open: %s\n", usb->name,
usb_endpoint_name ( ep ), strerror ( rc ) );
goto err_open;
}
ep->open = 1;
DBGC2 ( usb, "USB %s %s opened with MTU %zd, burst %d, interval %d\n",
usb->name, usb_endpoint_name ( ep ), ep->mtu, ep->burst,
ep->interval );
return 0;
ep->open = 0;
ep->host->close ( ep );
err_open:
usb->ep[idx] = NULL;
err_already:
if ( ep->max )
usb_flush ( ep );
return rc;
}
/**
* Clear transaction translator (if applicable)
*
* @v ep USB endpoint
* @ret rc Return status code
*/
static int usb_endpoint_clear_tt ( struct usb_endpoint *ep ) {
struct usb_device *usb = ep->usb;
struct usb_port *tt;
int rc;
/* Do nothing if this is a periodic endpoint */
if ( ep->attributes & USB_ENDPOINT_ATTR_PERIODIC )
return 0;
/* Do nothing if this endpoint is not behind a transaction translator */
tt = usb_transaction_translator ( usb );
if ( ! tt )
return 0;
/* Clear transaction translator buffer */
if ( ( rc = tt->hub->driver->clear_tt ( tt->hub, tt, ep ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not clear transaction translator: "
"%s\n", usb->name, usb_endpoint_name ( ep ),
strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Close USB endpoint
*
* @v ep USB endpoint
*/
void usb_endpoint_close ( struct usb_endpoint *ep ) {
struct usb_device *usb = ep->usb;
unsigned int idx = USB_ENDPOINT_IDX ( ep->address );
/* Sanity checks */
assert ( usb->ep[idx] == ep );
/* Close endpoint */
ep->open = 0;
ep->host->close ( ep );
assert ( ep->fill == 0 );
/* Remove from endpoint list */
usb->ep[idx] = NULL;
list_del ( &ep->halted );
/* Discard any recycled buffers, if applicable */
if ( ep->max )
usb_flush ( ep );
/* Clear transaction translator, if applicable */
usb_endpoint_clear_tt ( ep );
}
/**
* Reset USB endpoint
*
* @v ep USB endpoint
* @ret rc Return status code
*/
static int usb_endpoint_reset ( struct usb_endpoint *ep ) {
struct usb_device *usb = ep->usb;
unsigned int type;
int rc;
/* Sanity check */
assert ( ! list_empty ( &ep->halted ) );
/* Reset endpoint */
if ( ( rc = ep->host->reset ( ep ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not reset: %s\n",
usb->name, usb_endpoint_name ( ep ), strerror ( rc ) );
return rc;
}
/* Clear transaction translator, if applicable */
if ( ( rc = usb_endpoint_clear_tt ( ep ) ) != 0 )
return rc;
/* Clear endpoint halt, if applicable */
type = ( ep->attributes & USB_ENDPOINT_ATTR_TYPE_MASK );
if ( ( type != USB_ENDPOINT_ATTR_CONTROL ) &&
( ( rc = usb_clear_feature ( usb, USB_RECIP_ENDPOINT,
USB_ENDPOINT_HALT,
ep->address ) ) != 0 ) ) {
DBGC ( usb, "USB %s %s could not clear endpoint halt: %s\n",
usb->name, usb_endpoint_name ( ep ), strerror ( rc ) );
return rc;
}
/* Remove from list of halted endpoints */
list_del ( &ep->halted );
INIT_LIST_HEAD ( &ep->halted );
DBGC ( usb, "USB %s %s reset\n",
usb->name, usb_endpoint_name ( ep ) );
return 0;
}
/**
* Update endpoint MTU
*
* @v ep USB endpoint
* @v mtu New MTU
* @ret rc Return status code
*/
static int usb_endpoint_mtu ( struct usb_endpoint *ep, size_t mtu ) {
struct usb_device *usb = ep->usb;
int rc;
/* Update MTU */
ep->mtu = mtu;
if ( ( rc = ep->host->mtu ( ep ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not update MTU: %s\n",
usb->name, usb_endpoint_name ( ep ), strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Enqueue USB message transfer
*
* @v ep USB endpoint
* @v request Request
* @v value Value parameter
* @v index Index parameter
* @v iobuf I/O buffer
* @ret rc Return status code
*
* The I/O buffer must have sufficient headroom to contain a setup
* packet.
*/
int usb_message ( struct usb_endpoint *ep, unsigned int request,
unsigned int value, unsigned int index,
struct io_buffer *iobuf ) {
struct usb_device *usb = ep->usb;
struct usb_port *port = usb->port;
struct usb_setup_packet *packet;
size_t len = iob_len ( iobuf );
int rc;
/* Sanity check */
assert ( iob_headroom ( iobuf ) >= sizeof ( *packet ) );
/* Fail immediately if device has been unplugged */
if ( port->disconnected )
return -ENODEV;
/* Reset endpoint if required */
if ( ( ! list_empty ( &ep->halted ) ) &&
( ( rc = usb_endpoint_reset ( ep ) ) != 0 ) )
return rc;
/* Zero input data buffer (if applicable) */
if ( request & USB_DIR_IN )
memset ( iobuf->data, 0, len );
/* Construct setup packet */
packet = iob_push ( iobuf, sizeof ( *packet ) );
packet->request = cpu_to_le16 ( request );
packet->value = cpu_to_le16 ( value );
packet->index = cpu_to_le16 ( index );
packet->len = cpu_to_le16 ( len );
/* Enqueue message transfer */
if ( ( rc = ep->host->message ( ep, iobuf ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not enqueue message transfer: "
"%s\n", usb->name, usb_endpoint_name ( ep ),
strerror ( rc ) );
return rc;
}
/* Increment fill level */
ep->fill++;
return 0;
}
/**
* Enqueue USB stream transfer
*
* @v ep USB endpoint
* @v iobuf I/O buffer
* @v terminate Terminate using a short packet
* @ret rc Return status code
*/
int usb_stream ( struct usb_endpoint *ep, struct io_buffer *iobuf,
int terminate ) {
struct usb_device *usb = ep->usb;
struct usb_port *port = usb->port;
int zlp;
int rc;
/* Fail immediately if device has been unplugged */
if ( port->disconnected )
return -ENODEV;
/* Reset endpoint if required */
if ( ( ! list_empty ( &ep->halted ) ) &&
( ( rc = usb_endpoint_reset ( ep ) ) != 0 ) )
return rc;
/* Append a zero-length packet if necessary */
zlp = terminate;
if ( iob_len ( iobuf ) & ( ep->mtu - 1 ) )
zlp = 0;
/* Enqueue stream transfer */
if ( ( rc = ep->host->stream ( ep, iobuf, zlp ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not enqueue stream transfer: %s\n",
usb->name, usb_endpoint_name ( ep ), strerror ( rc ) );
return rc;
}
/* Increment fill level */
ep->fill++;
return 0;
}
/**
* Complete transfer (possibly with error)
*
* @v ep USB endpoint
* @v iobuf I/O buffer
* @v rc Completion status code
*/
void usb_complete_err ( struct usb_endpoint *ep, struct io_buffer *iobuf,
int rc ) {
struct usb_device *usb = ep->usb;
/* Decrement fill level */
assert ( ep->fill > 0 );
ep->fill--;
/* Schedule reset, if applicable */
if ( ( rc != 0 ) && ep->open ) {
DBGC ( usb, "USB %s %s completion failed: %s\n",
usb->name, usb_endpoint_name ( ep ), strerror ( rc ) );
list_del ( &ep->halted );
list_add_tail ( &ep->halted, &usb_halted );
}
/* Report completion */
ep->driver->complete ( ep, iobuf, rc );
}
/******************************************************************************
*
* Endpoint refilling
*
******************************************************************************
*/
/**
* Prefill endpoint recycled buffer list
*
* @v ep USB endpoint
* @ret rc Return status code
*/
int usb_prefill ( struct usb_endpoint *ep ) {
struct io_buffer *iobuf;
size_t len = ( ep->len ? ep->len : ep->mtu );
unsigned int fill;
int rc;
/* Sanity checks */
assert ( ep->fill == 0 );
assert ( ep->max > 0 );
assert ( list_empty ( &ep->recycled ) );
/* Fill recycled buffer list */
for ( fill = 0 ; fill < ep->max ; fill++ ) {
/* Allocate I/O buffer */
iobuf = alloc_iob ( len );
if ( ! iobuf ) {
rc = -ENOMEM;
goto err_alloc;
}
/* Add to recycled buffer list */
list_add_tail ( &iobuf->list, &ep->recycled );
}
return 0;
err_alloc:
usb_flush ( ep );
return rc;
}
/**
* Refill endpoint
*
* @v ep USB endpoint
* @ret rc Return status code
*/
int usb_refill ( struct usb_endpoint *ep ) {
struct io_buffer *iobuf;
size_t len = ( ep->len ? ep->len : ep->mtu );
int rc;
/* Sanity checks */
assert ( ep->open );
assert ( ep->max > 0 );
/* Refill endpoint */
while ( ep->fill < ep->max ) {
/* Get or allocate buffer */
if ( list_empty ( &ep->recycled ) ) {
/* Recycled buffer list is empty; allocate new buffer */
iobuf = alloc_iob ( len );
if ( ! iobuf )
return -ENOMEM;
} else {
/* Get buffer from recycled buffer list */
iobuf = list_first_entry ( &ep->recycled,
struct io_buffer, list );
assert ( iobuf != NULL );
list_del ( &iobuf->list );
}
/* Reset buffer to maximum size */
assert ( iob_len ( iobuf ) <= len );
iob_put ( iobuf, ( len - iob_len ( iobuf ) ) );
/* Enqueue buffer */
if ( ( rc = usb_stream ( ep, iobuf, 0 ) ) != 0 ) {
list_add ( &iobuf->list, &ep->recycled );
return rc;
}
}
return 0;
}
/**
* Discard endpoint recycled buffer list
*
* @v ep USB endpoint
*/
void usb_flush ( struct usb_endpoint *ep ) {
struct io_buffer *iobuf;
struct io_buffer *tmp;
/* Sanity checks */
assert ( ! ep->open );
assert ( ep->max > 0 );
/* Free all I/O buffers */
list_for_each_entry_safe ( iobuf, tmp, &ep->recycled, list ) {
list_del ( &iobuf->list );
free_iob ( iobuf );
}
}
/******************************************************************************
*
* Control endpoint
*
******************************************************************************
*/
/** USB control transfer pseudo-header */
struct usb_control_pseudo_header {
/** Completion status */
int rc;
};
/**
* Complete USB control transfer
*
* @v ep USB endpoint
* @v iobuf I/O buffer
* @v rc Completion status code
*/
static void usb_control_complete ( struct usb_endpoint *ep,
struct io_buffer *iobuf, int rc ) {
struct usb_device *usb = ep->usb;
struct usb_control_pseudo_header *pshdr;
/* Record completion status in buffer */
pshdr = iob_push ( iobuf, sizeof ( *pshdr ) );
pshdr->rc = rc;
/* Add to list of completed I/O buffers */
list_add_tail ( &iobuf->list, &usb->complete );
}
/** USB control endpoint driver operations */
static struct usb_endpoint_driver_operations usb_control_operations = {
.complete = usb_control_complete,
};
/**
* Issue USB control transaction
*
* @v usb USB device
* @v request Request
* @v value Value parameter
* @v index Index parameter
* @v data Data buffer (if any)
* @v len Length of data
* @ret rc Return status code
*/
int usb_control ( struct usb_device *usb, unsigned int request,
unsigned int value, unsigned int index, void *data,
size_t len ) {
struct usb_bus *bus = usb->port->hub->bus;
struct usb_endpoint *ep = &usb->control;
struct io_buffer *iobuf;
struct io_buffer *cmplt;
union {
struct usb_setup_packet setup;
struct usb_control_pseudo_header pshdr;
} *headroom;
struct usb_control_pseudo_header *pshdr;
unsigned int i;
int rc;
/* Allocate I/O buffer */
iobuf = alloc_iob ( sizeof ( *headroom ) + len );
if ( ! iobuf ) {
rc = -ENOMEM;
goto err_alloc;
}
iob_reserve ( iobuf, sizeof ( *headroom ) );
iob_put ( iobuf, len );
if ( request & USB_DIR_IN ) {
memset ( data, 0, len );
} else {
memcpy ( iobuf->data, data, len );
}
/* Enqueue message */
if ( ( rc = usb_message ( ep, request, value, index, iobuf ) ) != 0 )
goto err_message;
/* Wait for completion */
for ( i = 0 ; i < USB_CONTROL_MAX_WAIT_MS ; i++ ) {
/* Poll bus */
usb_poll ( bus );
/* Check for completion */
while ( ( cmplt = list_first_entry ( &usb->complete,
struct io_buffer,
list ) ) ) {
/* Remove from completion list */
list_del ( &cmplt->list );
/* Extract and strip completion status */
pshdr = cmplt->data;
iob_pull ( cmplt, sizeof ( *pshdr ) );
rc = pshdr->rc;
/* Discard stale completions */
if ( cmplt != iobuf ) {
DBGC ( usb, "USB %s stale control completion: "
"%s\n", usb->name, strerror ( rc ) );
DBGC_HDA ( usb, 0, cmplt->data,
iob_len ( cmplt ) );
free_iob ( cmplt );
continue;
}
/* Fail immediately if completion was in error */
if ( rc != 0 ) {
DBGC ( usb, "USB %s control %04x:%04x:%04x "
"failed: %s\n", usb->name, request,
value, index, strerror ( rc ) );
free_iob ( cmplt );
return rc;
}
/* Copy completion to data buffer, if applicable */
assert ( iob_len ( cmplt ) <= len );
if ( request & USB_DIR_IN )
memcpy ( data, cmplt->data, iob_len ( cmplt ) );
free_iob ( cmplt );
return 0;
}
/* Delay */
mdelay ( 1 );
}
DBGC ( usb, "USB %s timed out waiting for control %04x:%04x:%04x\n",
usb->name, request, value, index );
return -ETIMEDOUT;
err_message:
free_iob ( iobuf );
err_alloc:
return rc;
}
/**
* Get USB string descriptor
*
* @v usb USB device
* @v index String index
* @v language Language ID
* @v buf Data buffer
* @v len Length of buffer
* @ret len String length (excluding NUL), or negative error
*/
int usb_get_string_descriptor ( struct usb_device *usb, unsigned int index,
unsigned int language, char *buf, size_t len ) {
size_t max = ( len ? ( len - 1 /* NUL */ ) : 0 );
struct {
struct usb_descriptor_header header;
uint16_t character[max];
} __attribute__ (( packed )) *desc;
unsigned int actual;
unsigned int i;
int rc;
/* Allocate buffer for string */
desc = malloc ( sizeof ( *desc ) );
if ( ! desc ) {
rc = -ENOMEM;
goto err_alloc;
}
/* Get descriptor */
if ( ( rc = usb_get_descriptor ( usb, 0, USB_STRING_DESCRIPTOR, index,
language, &desc->header,
sizeof ( *desc ) ) ) != 0 )
goto err_get_descriptor;
/* Copy to buffer */
actual = ( ( desc->header.len - sizeof ( desc->header ) ) /
sizeof ( desc->character[0] ) );
for ( i = 0 ; ( ( i < actual ) && ( i < max ) ) ; i++ )
buf[i] = le16_to_cpu ( desc->character[i] );
if ( len )
buf[i] = '\0';
/* Free buffer */
free ( desc );
return actual;
err_get_descriptor:
free ( desc );
err_alloc:
return rc;
}
/******************************************************************************
*
* USB device driver
*
******************************************************************************
*/
/**
* Get USB configuration descriptor
*
* @v usb USB device
* @v index Configuration index
* @ret config Configuration descriptor
* @ret rc Return status code
*
* The configuration descriptor is dynamically allocated and must
* eventually be freed by the caller.
*/
static int
usb_config_descriptor ( struct usb_device *usb, unsigned int index,
struct usb_configuration_descriptor **config ) {
struct usb_configuration_descriptor partial;
size_t len;
int rc;
/* Read first part of configuration descriptor to get size */
if ( ( rc = usb_get_config_descriptor ( usb, index, &partial,
sizeof ( partial ) ) ) != 0 ) {
DBGC ( usb, "USB %s could not get configuration descriptor %d: "
"%s\n", usb->name, index, strerror ( rc ) );
goto err_get_partial;
}
len = le16_to_cpu ( partial.len );
if ( len < sizeof ( partial ) ) {
DBGC ( usb, "USB %s underlength configuraton descriptor %d\n",
usb->name, index );
rc = -EINVAL;
goto err_partial_len;
}
/* Allocate buffer for whole configuration descriptor */
*config = malloc ( len );
if ( ! *config ) {
rc = -ENOMEM;
goto err_alloc_config;
}
/* Read whole configuration descriptor */
if ( ( rc = usb_get_config_descriptor ( usb, index, *config,
len ) ) != 0 ) {
DBGC ( usb, "USB %s could not get configuration descriptor %d: "
"%s\n", usb->name, index, strerror ( rc ) );
goto err_get_config_descriptor;
}
if ( (*config)->len != partial.len ) {
DBGC ( usb, "USB %s bad configuration descriptor %d length\n",
usb->name, index );
rc = -EINVAL;
goto err_config_len;
}
return 0;
err_config_len:
err_get_config_descriptor:
free ( *config );
err_alloc_config:
err_partial_len:
err_get_partial:
return rc;
}
/**
* Describe USB function
*
* @v usb USB device
* @v config Configuration descriptor
* @v first First interface number
* @v interfaces Interface list to fill in
* @v desc Function descriptor to fill in
* @ret rc Return status code
*/
static int usb_describe ( struct usb_device *usb,
struct usb_configuration_descriptor *config,
unsigned int first, uint8_t *interfaces,
struct usb_function_descriptor *desc ) {
struct usb_interface_association_descriptor *association;
struct usb_interface_descriptor *interface;
struct cdc_union_descriptor *cdc_union;
unsigned int i;
/* Fill in vendor and product ID */
memset ( desc, 0, sizeof ( *desc ) );
desc->vendor = le16_to_cpu ( usb->device.vendor );
desc->product = le16_to_cpu ( usb->device.product );
/* First, look for an interface association descriptor */
association = usb_interface_association_descriptor ( config, first );
if ( association ) {
/* Sanity check */
assert ( association->first == first );
if ( ( first + association->count ) > config->interfaces ) {
DBGC ( usb, "USB %s has invalid association [%d-%d)\n",
usb->name, first, ( first + association->count));
return -ERANGE;
}
/* Describe function */
memcpy ( &desc->class, &association->class,
sizeof ( desc->class ) );
desc->count = association->count;
for ( i = 0 ; i < association->count ; i++ )
interfaces[i] = ( first + i );
return 0;
}
/* Next, look for an interface descriptor */
interface = usb_interface_descriptor ( config, first, 0 );
if ( ! interface ) {
DBGC ( usb, "USB %s has no descriptor for interface %d\n",
usb->name, first );
return -ENOENT;
}
/* Describe function */
memcpy ( &desc->class, &interface->class, sizeof ( desc->class ) );
desc->count = 1;
interfaces[0] = first;
/* Look for a CDC union descriptor, if applicable */
if ( ( desc->class.class.class == USB_CLASS_CDC ) &&
( cdc_union = cdc_union_descriptor ( config, interface ) ) ) {
/* Determine interface count */
desc->count = ( ( cdc_union->header.len -
offsetof ( typeof ( *cdc_union ),
interface[0] ) ) /
sizeof ( cdc_union->interface[0] ) );
if ( desc->count > config->interfaces ) {
DBGC ( usb, "USB %s has invalid union functional "
"descriptor with %d interfaces\n",
usb->name, desc->count );
return -ERANGE;
}
/* Describe function */
for ( i = 0 ; i < desc->count ; i++ ) {
if ( cdc_union->interface[i] >= config->interfaces ) {
DBGC ( usb, "USB %s has invalid union "
"functional descriptor covering "
"interface %d\n", usb->name,
cdc_union->interface[i] );
return -ERANGE;
}
interfaces[i] = cdc_union->interface[i];
}
return 0;
}
return 0;
}
/**
* Update list of used interface
*
* @v usb USB device
* @v count Number of interfaces
* @v interface List of interfaces
* @v used List of already-used interfaces
* @ret rc Return status code
*/
static int usb_used ( struct usb_device *usb, unsigned int count,
uint8_t *interface, uint8_t *used ) {
unsigned int i;
for ( i = 0 ; i < count ; i++ ) {
if ( used[interface[i]] ) {
DBGC ( usb, "USB %s interface %d already in use\n",
usb->name, interface[i] );
return -EINVAL;
}
used[interface[i]] = 1;
}
return 0;
}
/**
* Find USB device driver
*
* @v desc Function descriptor
* @ret id USB device ID, or NULL
* @ret driver USB device driver, or NULL
*/
struct usb_driver * usb_find_driver ( struct usb_function_descriptor *desc,
struct usb_device_id **id ) {
struct usb_driver *driver;
unsigned int i;
/* Look for a matching driver */
for_each_table_entry ( driver, USB_DRIVERS ) {
for ( i = 0 ; i < driver->id_count ; i++ ) {
/* Ignore non-matching driver class */
if ( ( driver->class.class.scalar ^ desc->class.scalar )
& driver->class.mask.scalar )
continue;
/* Look for a matching ID */
*id = &driver->ids[i];
if ( ( ( (*id)->vendor == desc->vendor ) ||
( (*id)->vendor == USB_ANY_ID ) ) &&
( ( (*id)->product == desc->product ) ||
( (*id)->product == USB_ANY_ID ) ) )
return driver;
}
}
/* Not found */
*id = NULL;
return NULL;
}
/**
* Get USB device configuration score
*
* @v usb USB device
* @v config Configuration descriptor
* @ret score Device configuration score, or negative error
*/
static int usb_score ( struct usb_device *usb,
struct usb_configuration_descriptor *config ) {
uint8_t used[config->interfaces];
uint8_t interface[config->interfaces];
struct usb_function_descriptor desc;
struct usb_driver *driver;
struct usb_device_id *id;
unsigned int first;
unsigned int score = 0;
int rc;
/* Identify each function in turn */
memset ( used, 0, sizeof ( used ) );
for ( first = 0 ; first < config->interfaces ; first++ ) {
/* Skip interfaces already used */
if ( used[first] )
continue;
/* Describe function */
if ( ( rc = usb_describe ( usb, config, first, interface,
&desc ) ) != 0 )
return rc;
/* Update used interfaces */
if ( ( rc = usb_used ( usb, desc.count, interface,
used ) ) != 0 )
return rc;
/* Look for a driver for this function */
driver = usb_find_driver ( &desc, &id );
if ( driver )
score += driver->score;
}
return score;
}
/**
* Probe USB device driver
*
* @v func USB function
* @v config Configuration descriptor
* @ret rc Return status code
*/
static int usb_probe ( struct usb_function *func,
struct usb_configuration_descriptor *config ) {
struct usb_device *usb = func->usb;
struct usb_driver *driver;
struct usb_device_id *id;
int rc;
/* Identify driver */
driver = usb_find_driver ( &func->desc, &id );
if ( ! driver ) {
DBGC ( usb, "USB %s %04x:%04x class %d:%d:%d has no driver\n",
func->name, func->desc.vendor, func->desc.product,
func->desc.class.class.class,
func->desc.class.class.subclass,
func->desc.class.class.protocol );
return -ENOENT;
}
/* Record driver */
func->driver = driver;
func->id = id;
func->dev.driver_name = id->name;
/* Probe driver */
if ( ( rc = driver->probe ( func, config ) ) != 0 ) {
DBGC ( usb, "USB %s failed to probe driver %s: %s\n",
func->name, id->name, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Remove USB device driver
*
* @v func USB function
*/
static void usb_remove ( struct usb_function *func ) {
/* Remove driver */
func->driver->remove ( func );
}
/**
* Probe all USB device drivers
*
* @v usb USB device
* @v config Configuration descriptor
*/
static void
usb_probe_all ( struct usb_device *usb,
struct usb_configuration_descriptor *config ) {
struct usb_bus *bus = usb->port->hub->bus;
struct usb_function *func;
uint8_t used[config->interfaces];
unsigned int first;
unsigned int i;
int rc;
/* Identify each function in turn */
memset ( used, 0, sizeof ( used ) );
for ( first = 0 ; first < config->interfaces ; first++ ) {
/* Skip interfaces already used */
if ( used[first] )
continue;
/* Allocate and initialise structure */
func = zalloc ( sizeof ( *func ) +
( config->interfaces *
sizeof ( func->interface[0] ) ) );
if ( ! func )
goto err_alloc;
func->name = func->dev.name;
func->usb = usb;
func->dev.desc.bus_type = BUS_TYPE_USB;
func->dev.desc.location = usb->address;
func->dev.desc.vendor = le16_to_cpu ( usb->device.vendor );
func->dev.desc.device = le16_to_cpu ( usb->device.product );
snprintf ( func->dev.name, sizeof ( func->dev.name ),
"%s-%d.%d", usb->name, config->config, first );
INIT_LIST_HEAD ( &func->dev.children );
func->dev.parent = bus->dev;
list_add_tail ( &func->list, &usb->functions );
/* Identify function */
if ( ( rc = usb_describe ( usb, config, first, func->interface,
&func->desc ) ) != 0 )
goto err_describe;
assert ( func->desc.count <= config->interfaces );
/* Mark interfaces as used */
if ( ( rc = usb_used ( usb, func->desc.count, func->interface,
used ) ) != 0 )
goto err_used;
/* Probe device driver */
if ( ( rc = usb_probe ( func, config ) ) != 0 )
goto err_probe;
DBGC ( usb, "USB %s %04x:%04x class %d:%d:%d interfaces ",
func->name, func->desc.vendor, func->desc.product,
func->desc.class.class.class,
func->desc.class.class.subclass,
func->desc.class.class.protocol );
for ( i = 0 ; i < func->desc.count ; i++ )
DBGC ( usb, "%s%d", ( i ? "," : "" ),
func->interface[i] );
DBGC ( usb, " using driver %s\n", func->dev.driver_name );
/* Add to device hierarchy */
list_add_tail ( &func->dev.siblings, &bus->dev->children );
continue;
list_del ( &func->dev.siblings );
usb_remove ( func );
err_probe:
err_used:
err_describe:
list_del ( &func->list );
free ( func );
err_alloc:
/* Continue registering other functions */
continue;
}
}
/**
* Remove all device drivers
*
* @v usb USB device
*/
static void usb_remove_all ( struct usb_device *usb ) {
struct usb_function *func;
struct usb_function *tmp;
/* Remove all functions */
list_for_each_entry_safe ( func, tmp, &usb->functions, list ) {
/* Remove device driver */
usb_remove ( func );
/* Remove from device hierarchy */
assert ( list_empty ( &func->dev.children ) );
list_del ( &func->dev.siblings );
/* Remove from list of functions */
list_del ( &func->list );
/* Free function */
free ( func );
}
}
/**
* Clear USB device configuration
*
* @v usb USB device
*/
static void usb_deconfigure ( struct usb_device *usb ) {
unsigned int i;
/* Remove device drivers */
usb_remove_all ( usb );
/* Sanity checks */
for ( i = 0 ; i < ( sizeof ( usb->ep ) / sizeof ( usb->ep[0] ) ) ; i++){
if ( i != USB_ENDPOINT_IDX ( USB_EP0_ADDRESS ) )
assert ( usb->ep[i] == NULL );
}
/* Clear device configuration */
usb_set_configuration ( usb, 0 );
}
/**
* Choose our preferred USB device configuration
*
* @v usb USB device
* @ret rc Return status code
*/
static int usb_autoconfigure ( struct usb_device *usb ) {
struct usb_configuration_descriptor *config;
unsigned int preferred = 0;
unsigned int index;
int score;
int best = 0;
int rc;
/* Calculate driver score for each configuration index */
for ( index = 0 ; index < usb->device.configurations ; index++ ) {
/* Read configuration descriptor */
if ( ( rc = usb_config_descriptor ( usb, index,
&config ) ) != 0 )
goto err_config;
/* Get score for this configuration */
score = usb_score ( usb, config );
if ( score < 0 ) {
rc = score;
goto err_score;
}
DBGC2 ( usb, "USB %s configuration %d score %d\n",
usb->name, config->config, score );
/* Record as preferred configuration, if applicable */
if ( score > best ) {
best = score;
preferred = index;
}
/* Free configuration descriptor */
free ( config );
config = NULL;
}
/* Read preferred configuration descriptor */
if ( ( rc = usb_config_descriptor ( usb, preferred, &config ) ) != 0 )
goto err_preferred;
/* Set configuration */
if ( ( rc = usb_set_configuration ( usb, config->config ) ) != 0){
DBGC ( usb, "USB %s could not set configuration %d: %s\n",
usb->name, config->config, strerror ( rc ) );
goto err_set_configuration;
}
/* Probe USB device drivers */
usb_probe_all ( usb, config );
/* Free configuration descriptor */
free ( config );
return 0;
usb_remove_all ( usb );
usb_set_configuration ( usb, 0 );
err_set_configuration:
free ( config );
err_preferred:
return rc;
err_score:
free ( config );
err_config:
return rc;
}
/******************************************************************************
*
* USB device
*
******************************************************************************
*/
/**
* Allocate USB device
*
* @v port USB port
* @ret usb USB device, or NULL on allocation failure
*/
static struct usb_device * alloc_usb ( struct usb_port *port ) {
struct usb_hub *hub = port->hub;
struct usb_bus *bus = hub->bus;
struct usb_device *usb;
/* Allocate and initialise structure */
usb = zalloc ( sizeof ( *usb ) );
if ( ! usb )
return NULL;
snprintf ( usb->name, sizeof ( usb->name ), "%s%c%d", hub->name,
( hub->usb ? '.' : '-' ), port->address );
usb->port = port;
INIT_LIST_HEAD ( &usb->functions );
usb->host = &bus->op->device;
usb_endpoint_init ( &usb->control, usb, &usb_control_operations );
INIT_LIST_HEAD ( &usb->complete );
return usb;
}
/**
* Register USB device
*
* @v usb USB device
* @ret rc Return status code
*/
static int register_usb ( struct usb_device *usb ) {
struct usb_port *port = usb->port;
struct usb_hub *hub = port->hub;
struct usb_bus *bus = hub->bus;
unsigned int protocol;
size_t mtu;
int rc;
/* Add to port */
if ( port->usb != NULL ) {
DBGC ( hub, "USB hub %s port %d is already registered to %s\n",
hub->name, port->address, port->usb->name );
rc = -EALREADY;
goto err_already;
}
port->usb = usb;
/* Add to bus device list */
list_add_tail ( &usb->list, &bus->devices );
/* Enable device */
if ( ( rc = hub->driver->enable ( hub, port ) ) != 0 ) {
DBGC ( hub, "USB hub %s port %d could not enable: %s\n",
hub->name, port->address, strerror ( rc ) );
goto err_enable;
}
/* Allow recovery interval since port may have been reset */
mdelay ( USB_RESET_RECOVER_DELAY_MS );
/* Get device speed */
if ( ( rc = hub->driver->speed ( hub, port ) ) != 0 ) {
DBGC ( hub, "USB hub %s port %d could not get speed: %s\n",
hub->name, port->address, strerror ( rc ) );
goto err_speed;
}
usb->speed = port->speed;
DBGC2 ( usb, "USB %s attached as %s-speed device\n",
usb->name, usb_speed_name ( usb->speed ) );
/* Open device */
if ( ( rc = usb->host->open ( usb ) ) != 0 ) {
DBGC ( usb, "USB %s could not open: %s\n",
usb->name, strerror ( rc ) );
goto err_open;
}
/* Describe control endpoint */
mtu = USB_EP0_DEFAULT_MTU ( usb->speed );
usb_endpoint_describe ( &usb->control, USB_EP0_ADDRESS,
USB_EP0_ATTRIBUTES, mtu, USB_EP0_BURST,
USB_EP0_INTERVAL );
/* Open control endpoint */
if ( ( rc = usb_endpoint_open ( &usb->control ) ) != 0 )
goto err_open_control;
assert ( usb_endpoint ( usb, USB_EP0_ADDRESS ) == &usb->control );
/* Assign device address */
if ( ( rc = usb->host->address ( usb ) ) != 0 ) {
DBGC ( usb, "USB %s could not set address: %s\n",
usb->name, strerror ( rc ) );
goto err_address;
}
DBGC2 ( usb, "USB %s assigned address %d\n", usb->name, usb->address );
/* Allow recovery interval after Set Address command */
mdelay ( USB_SET_ADDRESS_RECOVER_DELAY_MS );
/* Read first part of device descriptor to get EP0 MTU */
if ( ( rc = usb_get_mtu ( usb, &usb->device ) ) != 0 ) {
DBGC ( usb, "USB %s could not get MTU: %s\n",
usb->name, strerror ( rc ) );
goto err_get_mtu;
}
/* Calculate EP0 MTU */
protocol = le16_to_cpu ( usb->device.protocol );
mtu = ( ( protocol < USB_PROTO_3_0 ) ?
usb->device.mtu : ( 1 << usb->device.mtu ) );
DBGC2 ( usb, "USB %s has control MTU %zd (guessed %zd)\n",
usb->name, mtu, usb->control.mtu );
/* Update MTU */
if ( ( rc = usb_endpoint_mtu ( &usb->control, mtu ) ) != 0 )
goto err_mtu;
/* Read whole device descriptor */
if ( ( rc = usb_get_device_descriptor ( usb, &usb->device ) ) != 0 ) {
DBGC ( usb, "USB %s could not get device descriptor: %s\n",
usb->name, strerror ( rc ) );
goto err_get_device_descriptor;
}
DBGC ( usb, "USB %s addr %d %04x:%04x class %d:%d:%d (v%s, %s-speed, "
"MTU %zd)\n", usb->name, usb->address,
le16_to_cpu ( usb->device.vendor ),
le16_to_cpu ( usb->device.product ), usb->device.class.class,
usb->device.class.subclass, usb->device.class.protocol,
usb_bcd ( le16_to_cpu ( usb->device.protocol ) ),
usb_speed_name ( usb->speed ), usb->control.mtu );
/* Configure device */
if ( ( rc = usb_autoconfigure ( usb ) ) != 0 )
goto err_autoconfigure;
return 0;
usb_deconfigure ( usb );
err_autoconfigure:
err_get_device_descriptor:
err_mtu:
err_get_mtu:
err_address:
usb_endpoint_close ( &usb->control );
err_open_control:
usb->host->close ( usb );
err_open:
err_speed:
hub->driver->disable ( hub, port );
err_enable:
list_del ( &usb->list );
port->usb = NULL;
err_already:
return rc;
}
/**
* Unregister USB device
*
* @v usb USB device
*/
static void unregister_usb ( struct usb_device *usb ) {
struct usb_port *port = usb->port;
struct usb_hub *hub = port->hub;
struct io_buffer *iobuf;
struct io_buffer *tmp;
/* Sanity checks */
assert ( port->usb == usb );
/* Clear device configuration */
usb_deconfigure ( usb );
/* Close control endpoint */
usb_endpoint_close ( &usb->control );
/* Discard any stale control completions */
list_for_each_entry_safe ( iobuf, tmp, &usb->complete, list ) {
list_del ( &iobuf->list );
free_iob ( iobuf );
}
/* Close device */
usb->host->close ( usb );
/* Disable port */
hub->driver->disable ( hub, port );
/* Remove from bus device list */
list_del ( &usb->list );
/* Remove from port */
port->usb = NULL;
}
/**
* Free USB device
*
* @v usb USB device
*/
static void free_usb ( struct usb_device *usb ) {
unsigned int i;
/* Sanity checks */
for ( i = 0 ; i < ( sizeof ( usb->ep ) / sizeof ( usb->ep[0] ) ) ; i++ )
assert ( usb->ep[i] == NULL );
assert ( list_empty ( &usb->functions ) );
assert ( list_empty ( &usb->complete ) );
/* Free device */
free ( usb );
}
/******************************************************************************
*
* USB device hotplug event handling
*
******************************************************************************
*/
/**
* Handle newly attached USB device
*
* @v port USB port
* @ret rc Return status code
*/
static int usb_attached ( struct usb_port *port ) {
struct usb_device *usb;
int rc;
/* Mark port as attached */
port->attached = 1;
/* Sanity checks */
assert ( port->usb == NULL );
/* Allocate USB device */
usb = alloc_usb ( port );
if ( ! usb ) {
rc = -ENOMEM;
goto err_alloc;
}
/* Register USB device */
if ( ( rc = register_usb ( usb ) ) != 0 )
goto err_register;
return 0;
unregister_usb ( usb );
err_register:
free_usb ( usb );
err_alloc:
return rc;
}
/**
* Handle newly detached USB device
*
* @v port USB port
*/
static void usb_detached ( struct usb_port *port ) {
struct usb_device *usb = port->usb;
/* Mark port as detached */
port->attached = 0;
/* Do nothing if we have no USB device */
if ( ! usb )
return;
/* Unregister USB device */
unregister_usb ( usb );
/* Free USB device */
free_usb ( usb );
}
/**
* Handle newly attached or detached USB device
*
* @v port USB port
* @ret rc Return status code
*/
static int usb_hotplugged ( struct usb_port *port ) {
struct usb_hub *hub = port->hub;
int rc;
/* Get current port speed */
if ( ( rc = hub->driver->speed ( hub, port ) ) != 0 ) {
DBGC ( hub, "USB hub %s port %d could not get speed: %s\n",
hub->name, port->address, strerror ( rc ) );
/* Treat as a disconnection */
port->disconnected = 1;
port->speed = USB_SPEED_NONE;
}
/* Detach device, if applicable */
if ( port->attached && ( port->disconnected || ! port->speed ) )
usb_detached ( port );
/* Clear any recorded disconnections */
port->disconnected = 0;
/* Attach device, if applicable */
if ( port->speed && ( ! port->attached ) &&
( ( rc = usb_attached ( port ) ) != 0 ) )
return rc;
return 0;
}
/******************************************************************************
*
* USB process
*
******************************************************************************
*/
/**
* Report port status change
*
* @v port USB port
*/
void usb_port_changed ( struct usb_port *port ) {
/* Record hub port status change */
list_del ( &port->changed );
list_add_tail ( &port->changed, &usb_changed );
}
/**
* Handle newly attached or detached USB device
*
*/
static void usb_hotplug ( void ) {
struct usb_port *port;
/* Handle any changed ports, allowing for the fact that the
* port list may change as we perform hotplug actions.
*/
while ( ! list_empty ( &usb_changed ) ) {
/* Get first changed port */
port = list_first_entry ( &usb_changed, struct usb_port,
changed );
assert ( port != NULL );
/* Remove from list of changed ports */
list_del ( &port->changed );
INIT_LIST_HEAD ( &port->changed );
/* Perform appropriate hotplug action */
usb_hotplugged ( port );
}
}
/**
* USB process
*
* @v process USB process
*/
static void usb_step ( struct process *process __unused ) {
struct usb_bus *bus;
struct usb_endpoint *ep;
/* Poll all buses */
for_each_usb_bus ( bus )
usb_poll ( bus );
/* Attempt to reset first halted endpoint in list, if any. We
* do not attempt to process the complete list, since this
* would require extra code to allow for the facts that the
* halted endpoint list may change as we do so, and that
* resetting an endpoint may fail.
*/
if ( ( ep = list_first_entry ( &usb_halted, struct usb_endpoint,
halted ) ) != NULL )
usb_endpoint_reset ( ep );
/* Handle any changed ports */
usb_hotplug();
}
/** USB process */
PERMANENT_PROCESS ( usb_process, usb_step );
/******************************************************************************
*
* USB hub
*
******************************************************************************
*/
/**
* Allocate USB hub
*
* @v bus USB bus
* @v usb Underlying USB device, if any
* @v ports Number of ports
* @v driver Hub driver operations
* @ret hub USB hub, or NULL on allocation failure
*/
struct usb_hub * alloc_usb_hub ( struct usb_bus *bus, struct usb_device *usb,
unsigned int ports,
struct usb_hub_driver_operations *driver ) {
struct usb_hub *hub;
struct usb_port *port;
unsigned int i;
/* Allocate and initialise structure */
hub = zalloc ( sizeof ( *hub ) + ( ports * sizeof ( hub->port[0] ) ) );
if ( ! hub )
return NULL;
hub->name = ( usb ? usb->name : bus->name );
hub->bus = bus;
hub->usb = usb;
if ( usb )
hub->protocol = usb->port->protocol;
hub->ports = ports;
hub->driver = driver;
hub->host = &bus->op->hub;
/* Initialise port list */
for ( i = 1 ; i <= hub->ports ; i++ ) {
port = usb_port ( hub, i );
port->hub = hub;
port->address = i;
if ( usb )
port->protocol = usb->port->protocol;
INIT_LIST_HEAD ( &port->changed );
}
return hub;
}
/**
* Register USB hub
*
* @v hub USB hub
* @ret rc Return status code
*/
int register_usb_hub ( struct usb_hub *hub ) {
struct usb_bus *bus = hub->bus;
struct usb_port *port;
unsigned int i;
int rc;
/* Add to hub list */
list_add_tail ( &hub->list, &bus->hubs );
/* Open hub (host controller) */
if ( ( rc = hub->host->open ( hub ) ) != 0 ) {
DBGC ( hub, "USB hub %s could not open: %s\n",
hub->name, strerror ( rc ) );
goto err_host_open;
}
/* Open hub (driver) */
if ( ( rc = hub->driver->open ( hub ) ) != 0 ) {
DBGC ( hub, "USB hub %s could not open: %s\n",
hub->name, strerror ( rc ) );
goto err_driver_open;
}
/* Delay to allow ports to stabilise */
mdelay ( USB_PORT_DELAY_MS );
/* Mark all ports as changed */
for ( i = 1 ; i <= hub->ports ; i++ ) {
port = usb_port ( hub, i );
usb_port_changed ( port );
}
/* Some hubs seem to defer reporting device connections until
* their interrupt endpoint is polled for the first time.
* Poll the bus once now in order to pick up any such
* connections.
*/
usb_poll ( bus );
return 0;
hub->driver->close ( hub );
err_driver_open:
hub->host->close ( hub );
err_host_open:
list_del ( &hub->list );
return rc;
}
/**
* Unregister USB hub
*
* @v hub USB hub
*/
void unregister_usb_hub ( struct usb_hub *hub ) {
struct usb_port *port;
unsigned int i;
/* Detach all devices */
for ( i = 1 ; i <= hub->ports ; i++ ) {
port = usb_port ( hub, i );
if ( port->attached )
usb_detached ( port );
}
/* Close hub (driver) */
hub->driver->close ( hub );
/* Close hub (host controller) */
hub->host->close ( hub );
/* Cancel any pending port status changes */
for ( i = 1 ; i <= hub->ports ; i++ ) {
port = usb_port ( hub, i );
list_del ( &port->changed );
INIT_LIST_HEAD ( &port->changed );
}
/* Remove from hub list */
list_del ( &hub->list );
}
/**
* Free USB hub
*
* @v hub USB hub
*/
void free_usb_hub ( struct usb_hub *hub ) {
struct usb_port *port;
unsigned int i;
/* Sanity checks */
for ( i = 1 ; i <= hub->ports ; i++ ) {
port = usb_port ( hub, i );
assert ( ! port->attached );
assert ( port->usb == NULL );
assert ( list_empty ( &port->changed ) );
}
/* Free hub */
free ( hub );
}
/******************************************************************************
*
* USB bus
*
******************************************************************************
*/
/**
* Allocate USB bus
*
* @v dev Underlying hardware device
* @v ports Number of root hub ports
* @v mtu Largest transfer allowed on the bus
* @v op Host controller operations
* @ret bus USB bus, or NULL on allocation failure
*/
struct usb_bus * alloc_usb_bus ( struct device *dev, unsigned int ports,
size_t mtu, struct usb_host_operations *op ) {
struct usb_bus *bus;
/* Allocate and initialise structure */
bus = zalloc ( sizeof ( *bus ) );
if ( ! bus )
goto err_alloc_bus;
bus->name = dev->name;
bus->dev = dev;
bus->mtu = mtu;
bus->op = op;
INIT_LIST_HEAD ( &bus->devices );
INIT_LIST_HEAD ( &bus->hubs );
bus->host = &bus->op->bus;
/* Allocate root hub */
bus->hub = alloc_usb_hub ( bus, NULL, ports, &op->root );
if ( ! bus->hub )
goto err_alloc_hub;
return bus;
free_usb_hub ( bus->hub );
err_alloc_hub:
free ( bus );
err_alloc_bus:
return NULL;
}
/**
* Register USB bus
*
* @v bus USB bus
* @ret rc Return status code
*/
int register_usb_bus ( struct usb_bus *bus ) {
int rc;
/* Sanity checks */
assert ( bus->hub != NULL );
/* Open bus */
if ( ( rc = bus->host->open ( bus ) ) != 0 )
goto err_open;
/* Add to list of USB buses */
list_add_tail ( &bus->list, &usb_buses );
/* Register root hub */
if ( ( rc = register_usb_hub ( bus->hub ) ) != 0 )
goto err_register_hub;
/* Attach any devices already present */
usb_hotplug();
return 0;
unregister_usb_hub ( bus->hub );
err_register_hub:
list_del ( &bus->list );
bus->host->close ( bus );
err_open:
return rc;
}
/**
* Unregister USB bus
*
* @v bus USB bus
*/
void unregister_usb_bus ( struct usb_bus *bus ) {
/* Sanity checks */
assert ( bus->hub != NULL );
/* Unregister root hub */
unregister_usb_hub ( bus->hub );
/* Remove from list of USB buses */
list_del ( &bus->list );
/* Close bus */
bus->host->close ( bus );
/* Sanity checks */
assert ( list_empty ( &bus->devices ) );
assert ( list_empty ( &bus->hubs ) );
}
/**
* Free USB bus
*
* @v bus USB bus
*/
void free_usb_bus ( struct usb_bus *bus ) {
struct usb_endpoint *ep;
struct usb_port *port;
/* Sanity checks */
assert ( list_empty ( &bus->devices ) );
assert ( list_empty ( &bus->hubs ) );
list_for_each_entry ( ep, &usb_halted, halted )
assert ( ep->usb->port->hub->bus != bus );
list_for_each_entry ( port, &usb_changed, changed )
assert ( port->hub->bus != bus );
/* Free root hub */
free_usb_hub ( bus->hub );
/* Free bus */
free ( bus );
}
/**
* Find USB bus by device location
*
* @v bus_type Bus type
* @v location Bus location
* @ret bus USB bus, or NULL
*/
struct usb_bus * find_usb_bus_by_location ( unsigned int bus_type,
unsigned int location ) {
struct usb_bus *bus;
for_each_usb_bus ( bus ) {
if ( ( bus->dev->desc.bus_type == bus_type ) &&
( bus->dev->desc.location == location ) )
return bus;
}
return NULL;
}
/******************************************************************************
*
* USB address assignment
*
******************************************************************************
*/
/**
* Allocate device address
*
* @v bus USB bus
* @ret address Device address, or negative error
*/
int usb_alloc_address ( struct usb_bus *bus ) {
unsigned int address;
/* Find first free device address */
address = ffsll ( ~bus->addresses );
if ( ! address )
return -ENOENT;
/* Mark address as used */
bus->addresses |= ( 1ULL << ( address - 1 ) );
return address;
}
/**
* Free device address
*
* @v bus USB bus
* @v address Device address
*/
void usb_free_address ( struct usb_bus *bus, unsigned int address ) {
/* Sanity check */
assert ( address > 0 );
assert ( bus->addresses & ( 1ULL << ( address - 1 ) ) );
/* Mark address as free */
bus->addresses &= ~( 1ULL << ( address - 1 ) );
}
/******************************************************************************
*
* USB bus topology
*
******************************************************************************
*/
/**
* Get USB route string
*
* @v usb USB device
* @ret route USB route string
*/
unsigned int usb_route_string ( struct usb_device *usb ) {
struct usb_device *parent;
unsigned int route;
/* Navigate up to root hub, constructing route string as we go */
for ( route = 0 ; ( parent = usb->port->hub->usb ) ; usb = parent ) {
route <<= 4;
route |= ( ( usb->port->address > 0xf ) ?
0xf : usb->port->address );
}
return route;
}
/**
* Get USB depth
*
* @v usb USB device
* @ret depth Hub depth
*/
unsigned int usb_depth ( struct usb_device *usb ) {
struct usb_device *parent;
unsigned int depth;
/* Navigate up to root hub, constructing depth as we go */
for ( depth = 0 ; ( parent = usb->port->hub->usb ) ; usb = parent )
depth++;
return depth;
}
/**
* Get USB root hub port
*
* @v usb USB device
* @ret port Root hub port
*/
struct usb_port * usb_root_hub_port ( struct usb_device *usb ) {
struct usb_device *parent;
/* Navigate up to root hub */
while ( ( parent = usb->port->hub->usb ) )
usb = parent;
return usb->port;
}
/**
* Get USB transaction translator
*
* @v usb USB device
* @ret port Transaction translator port, or NULL
*/
struct usb_port * usb_transaction_translator ( struct usb_device *usb ) {
struct usb_device *parent;
/* Navigate up to root hub. If we find a low-speed or
* full-speed device with a higher-speed parent hub, then that
* device's port is the transaction translator.
*/
for ( ; ( parent = usb->port->hub->usb ) ; usb = parent ) {
if ( ( usb->speed <= USB_SPEED_FULL ) &&
( parent->speed > USB_SPEED_FULL ) )
return usb->port;
}
return NULL;
}
/* Drag in objects via register_usb_bus() */
REQUIRING_SYMBOL ( register_usb_bus );
/* Drag in USB configuration */
REQUIRE_OBJECT ( config_usb );
/* Drag in hub driver */
REQUIRE_OBJECT ( usbhub );
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