usb.c File Reference

Universal Serial Bus (USB) More...

#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>

Go to the source code of this file.

Data Structures
struct	usb_control_pseudo_header
	USB control transfer pseudo-header. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
static const char *	usb_speed_name (unsigned int speed)
	Get USB speed name (for debugging) More...
static const char *	usb_bcd (uint16_t bcd)
	Transcribe USB BCD-coded value (for debugging) More...
static struct usb_interface_association_descriptor *	usb_interface_association_descriptor (struct usb_configuration_descriptor *config, unsigned int first)
	Locate USB interface association descriptor. More...
struct usb_interface_descriptor *	usb_interface_descriptor (struct usb_configuration_descriptor *config, unsigned int interface, unsigned int alternate)
	Locate USB interface descriptor. More...
struct usb_endpoint_descriptor *	usb_endpoint_descriptor (struct usb_configuration_descriptor *config, struct usb_interface_descriptor *interface, unsigned int type, unsigned int index)
	Locate USB endpoint descriptor. More...
struct usb_endpoint_companion_descriptor *	usb_endpoint_companion_descriptor (struct usb_configuration_descriptor *config, struct usb_endpoint_descriptor *desc)
	Locate USB endpoint companion descriptor. More...
const char *	usb_endpoint_name (struct usb_endpoint *ep)
	Get USB endpoint name (for debugging) More...
int	usb_endpoint_described (struct usb_endpoint *ep, struct usb_configuration_descriptor *config, struct usb_interface_descriptor *interface, unsigned int type, unsigned int index)
	Describe USB endpoint from device configuration. More...
int	usb_endpoint_open (struct usb_endpoint *ep)
	Open USB endpoint. More...
static int	usb_endpoint_clear_tt (struct usb_endpoint *ep)
	Clear transaction translator (if applicable) More...
int	usb_endpoint_clear_halt (struct usb_endpoint *ep)
	Clear endpoint halt (if applicable) More...
void	usb_endpoint_close (struct usb_endpoint *ep)
	Close USB endpoint. More...
static int	usb_endpoint_reset (struct usb_endpoint *ep)
	Reset USB endpoint. More...
static int	usb_endpoint_mtu (struct usb_endpoint *ep, size_t mtu)
	Update endpoint MTU. More...
int	usb_message (struct usb_endpoint *ep, unsigned int request, unsigned int value, unsigned int index, struct io_buffer *iobuf)
	Enqueue USB message transfer. More...
int	usb_stream (struct usb_endpoint *ep, struct io_buffer *iobuf, int terminate)
	Enqueue USB stream transfer. More...
void	usb_complete_err (struct usb_endpoint *ep, struct io_buffer *iobuf, int rc)
	Complete transfer (possibly with error) More...
int	usb_prefill (struct usb_endpoint *ep)
	Prefill endpoint recycled buffer list. More...
int	usb_refill_limit (struct usb_endpoint *ep, unsigned int max)
	Refill endpoint up to specified limit. More...
int	usb_refill (struct usb_endpoint *ep)
	Refill endpoint. More...
void	usb_flush (struct usb_endpoint *ep)
	Discard endpoint recycled buffer list. More...
static void	usb_control_complete (struct usb_endpoint *ep, struct io_buffer *iobuf, int rc)
	Complete USB control transfer. More...
int	usb_control (struct usb_device *usb, unsigned int request, unsigned int value, unsigned int index, void *data, size_t len)
	Issue USB control transaction. More...
static unsigned int	usb_get_default_language (struct usb_device *usb)
	Get default language ID. More...
int	usb_get_string_descriptor (struct usb_device *usb, unsigned int index, unsigned int language, char *buf, size_t len)
	Get USB string descriptor. More...
static int	usb_config_descriptor (struct usb_device *usb, unsigned int index, struct usb_configuration_descriptor **config)
	Get USB configuration descriptor. More...
static int	usb_describe (struct usb_device *usb, struct usb_configuration_descriptor *config, unsigned int first, uint8_t *interfaces, struct usb_function_descriptor *desc)
	Describe USB function. More...
static int	usb_used (struct usb_device *usb, unsigned int count, uint8_t *interface, uint8_t *used)
	Update list of used interface. More...
struct usb_driver *	usb_find_driver (struct usb_function_descriptor *desc, struct usb_device_id **id)
	Find USB device driver. More...
static int	usb_score (struct usb_device *usb, struct usb_configuration_descriptor *config)
	Get USB device configuration score. More...
static int	usb_probe (struct usb_function *func, struct usb_configuration_descriptor *config)
	Probe USB device driver. More...
static void	usb_remove (struct usb_function *func)
	Remove USB device driver. More...
static void	usb_probe_all (struct usb_device *usb, struct usb_configuration_descriptor *config)
	Probe all USB device drivers. More...
static void	usb_remove_all (struct usb_device *usb)
	Remove all device drivers. More...
static void	usb_deconfigure (struct usb_device *usb)
	Clear USB device configuration. More...
static int	usb_autoconfigure (struct usb_device *usb)
	Choose our preferred USB device configuration. More...
static struct usb_device *	alloc_usb (struct usb_port *port)
	Allocate USB device. More...
static int	register_usb (struct usb_device *usb)
	Register USB device. More...
static void	unregister_usb (struct usb_device *usb)
	Unregister USB device. More...
static void	free_usb (struct usb_device *usb)
	Free USB device. More...
struct usb_device *	find_usb (struct usb_bus *bus, unsigned int address)
	Find USB device by address. More...
static int	usb_attached (struct usb_port *port)
	Handle newly attached USB device. More...
static void	usb_detached (struct usb_port *port)
	Handle newly detached USB device. More...
static int	usb_hotplugged (struct usb_port *port)
	Handle newly attached or detached USB device. More...
void	usb_port_changed (struct usb_port *port)
	Report port status change. More...
static void	usb_hotplug (void)
	Handle newly attached or detached USB device. More...
static void	usb_step (struct process *process __unused)
	USB process. More...
	PERMANENT_PROCESS (usb_process, usb_step)
	USB process. More...
struct usb_hub *	alloc_usb_hub (struct usb_bus *bus, struct usb_device *usb, unsigned int ports, struct usb_hub_driver_operations *driver)
	Allocate USB hub. More...
int	register_usb_hub (struct usb_hub *hub)
	Register USB hub. More...
void	unregister_usb_hub (struct usb_hub *hub)
	Unregister USB hub. More...
void	free_usb_hub (struct usb_hub *hub)
	Free USB hub. More...
struct usb_bus *	alloc_usb_bus (struct device *dev, unsigned int ports, size_t mtu, struct usb_host_operations *op)
	Allocate USB bus. More...
int	register_usb_bus (struct usb_bus *bus)
	Register USB bus. More...
void	unregister_usb_bus (struct usb_bus *bus)
	Unregister USB bus. More...
void	free_usb_bus (struct usb_bus *bus)
	Free USB bus. More...
struct usb_bus *	find_usb_bus (unsigned int address)
	Find USB bus by address. More...
struct usb_bus *	find_usb_bus_by_location (unsigned int bus_type, unsigned int location)
	Find USB bus by device location. More...
int	usb_alloc_address (struct usb_bus *bus)
	Allocate device address. More...
void	usb_free_address (struct usb_bus *bus, unsigned int address)
	Free device address. More...
int	usb_find_next (struct usb_device **usb, uint16_t *busdev)
	Find next USB device. More...
unsigned int	usb_route_string (struct usb_device *usb)
	Get USB route string. More...
struct usb_port *	usb_root_hub_port (struct usb_device *usb)
	Get USB root hub port. More...
struct usb_port *	usb_transaction_translator (struct usb_device *usb)
	Get USB transaction translator. More...
	REQUIRING_SYMBOL (register_usb_bus)
	REQUIRE_OBJECT (config_usb)
	REQUIRE_OBJECT (usbhub)

Variables
struct list_head	usb_buses = LIST_HEAD_INIT ( usb_buses )
	List of USB buses. More...
static struct list_head	usb_changed = LIST_HEAD_INIT ( usb_changed )
	List of changed ports. More...
static struct list_head	usb_halted = LIST_HEAD_INIT ( usb_halted )
	List of halted endpoints. More...
static struct usb_endpoint_driver_operations	usb_control_operations
	USB control endpoint driver operations. More...

Detailed Description

Universal Serial Bus (USB)

Definition in file usb.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

usb_speed_name()

static const char* usb_speed_name ( unsigned int  speed )

inlinestatic

Get USB speed name (for debugging)

Parameters

speed

Speed

Return values

name	Speed name

Definition at line 66 of file usb.c.

                                                                 {
        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;
        }
}

References snprintf(), USB_SPEED_EXPONENT, USB_SPEED_FULL, USB_SPEED_HIGH, USB_SPEED_LOW, USB_SPEED_MANTISSA, USB_SPEED_NONE, and USB_SPEED_SUPER.

Referenced by register_usb().

usb_bcd()

static const char* usb_bcd ( uint16_t  bcd )

inlinestatic

Transcribe USB BCD-coded value (for debugging)

Parameters

bcd	BCD-coded value

Return values

string

Transcribed value

Definition at line 96 of file usb.c.

                                                    {
        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;
}

References high, low, and snprintf().

Referenced by register_usb().

usb_interface_association_descriptor()

static struct usb_interface_association_descriptor* usb_interface_association_descriptor ( struct usb_configuration_descriptor *  config, unsigned int  first  )

static

Locate USB interface association descriptor.

Parameters

config	Configuraton descriptor
first	First interface number

Return values

desc	Interface association descriptor, or NULL if not found

Definition at line 120 of file usb.c.

                                                            {
        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;
}

References desc, first, for_each_config_descriptor, and NULL.

Referenced by usb_describe().

usb_interface_descriptor()

struct usb_interface_descriptor* usb_interface_descriptor	(	struct usb_configuration_descriptor *	config,
		unsigned int	interface,
		unsigned int	alternate
	)

Locate USB interface descriptor.

Parameters

config	Configuraton descriptor
interface	Interface number
alternate	Alternate setting

Return values

desc	Interface descriptor, or NULL if not found

Definition at line 144 of file usb.c.

                                                                            {
        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;
}

References alternate, desc, for_each_config_descriptor, and NULL.

Referenced by ecm_probe(), efi_usb_get_interface_descriptor(), ncm_probe(), usbblk_probe(), usbhid_describe(), usbnet_comms_describe(), and usbnet_data_describe().

usb_endpoint_descriptor()

struct usb_endpoint_descriptor* usb_endpoint_descriptor	(	struct usb_configuration_descriptor *	config,
		struct usb_interface_descriptor *	interface,
		unsigned int	type,
		unsigned int	index
	)

Locate USB endpoint descriptor.

Parameters

config	Configuration descriptor
interface	Interface descriptor
type	Endpoint (internal) type
index	Endpoint index

Return values

desc	Descriptor, or NULL if not found

Definition at line 168 of file usb.c.

                                                                  {
        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;
}

References usb_endpoint_descriptor::attributes, desc, direction, for_each_interface_descriptor, index, NULL, type, USB_DIR_IN, and USB_ENDPOINT_ATTR_TYPE_MASK.

Referenced by usb_endpoint_described().

usb_endpoint_companion_descriptor()

struct usb_endpoint_companion_descriptor* usb_endpoint_companion_descriptor	(	struct usb_configuration_descriptor *	config,
		struct usb_endpoint_descriptor *	desc
	)

Locate USB endpoint companion descriptor.

Parameters

config	Configuration descriptor
desc	Endpoint descriptor

Return values

descx

Companion descriptor, or NULL if not found

Definition at line 195 of file usb.c.

                                                                           {
        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 );
}

References container_of, desc, header, usb_endpoint_companion_descriptor::header, NULL, usb_descriptor_header::type, USB_ENDPOINT_COMPANION_DESCRIPTOR, usb_is_within_config(), and usb_next_descriptor().

Referenced by usb_endpoint_described().

usb_endpoint_name()

const char* usb_endpoint_name

(

struct usb_endpoint *

ep

)

Get USB endpoint name (for debugging)

Parameters

ep	USB endpoint

Return values

name	Endpoint name

Definition at line 221 of file usb.c.

                                                           {
        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;
}

References address, usb_endpoint::address, snprintf(), USB_ENDPOINT_IN, and USB_ENDPOINT_MAX.

Referenced by efi_usb_async_start(), efi_usb_close(), efi_usb_open(), efi_usb_sync_transfer(), ehci_endpoint_close(), ehci_endpoint_poll(), ehci_root_clear_tt(), uhci_endpoint_poll(), uhci_root_clear_tt(), usb_complete_err(), usb_endpoint_clear_halt(), usb_endpoint_clear_tt(), usb_endpoint_mtu(), usb_endpoint_open(), usb_endpoint_reset(), usb_message(), usb_stream(), usbio_bulk_in_poll(), usbio_bulk_out_poll(), usbio_control_poll(), usbio_endpoint_open(), usbio_interface(), usbio_interrupt_callback(), usbio_interrupt_open(), usbkbd_probe(), and xhci_root_clear_tt().

usb_endpoint_described()

int usb_endpoint_described	(	struct usb_endpoint *	ep,
		struct usb_configuration_descriptor *	config,
		struct usb_interface_descriptor *	interface,
		unsigned int	type,
		unsigned int	index
	)

Describe USB endpoint from device configuration.

Parameters

ep	USB endpoint
config	Configuration descriptor
interface	Interface descriptor
type	Endpoint (internal) type
index	Endpoint index

Return values

rc	Return status code

Definition at line 242 of file usb.c.

                                                                     {
        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;
}

References burst, usb_endpoint_companion_descriptor::burst, desc, ENOENT, usb_device::ep, index, le16_to_cpu, mtu, usb_device::speed, type, usb_endpoint::usb, USB_ENDPOINT_ATTR_INTERRUPT, USB_ENDPOINT_ATTR_TYPE_MASK, USB_ENDPOINT_BURST, usb_endpoint_companion_descriptor(), usb_endpoint_describe(), usb_endpoint_descriptor(), USB_ENDPOINT_MTU, and USB_SPEED_HIGH.

Referenced by hub_probe(), usbblk_probe(), usbhid_describe(), usbnet_comms_describe(), and usbnet_data_describe().

usb_endpoint_open()

int usb_endpoint_open

(

struct usb_endpoint *

ep

)

Open USB endpoint.

Parameters

ep	USB endpoint

Return values

rc	Return status code

Definition at line 294 of file usb.c.

                                                  {
        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;
}

References usb_endpoint::address, usb_endpoint::burst, usb_hub::bus, usb_endpoint_host_operations::close, DBGC, DBGC2, EALREADY, usb_host_operations::endpoint, usb_device::ep, usb_endpoint::halted, usb_endpoint::host, usb_port::hub, INIT_LIST_HEAD, usb_endpoint::interval, usb_endpoint::max, usb_endpoint::mtu, usb_device::name, NULL, usb_bus::op, usb_endpoint::open, usb_endpoint_host_operations::open, usb_device::port, rc, strerror(), usb_endpoint::usb, USB_ENDPOINT_IDX, usb_endpoint_name(), and usb_flush().

Referenced by efi_usb_open(), hub_open(), register_usb(), usbblk_open(), usbhid_open(), and usbnet_open().

usb_endpoint_clear_tt()

static int usb_endpoint_clear_tt ( struct usb_endpoint *  ep )

static

Clear transaction translator (if applicable)

Parameters

ep	USB endpoint

Return values

rc	Return status code

Definition at line 341 of file usb.c.

                                                             {
        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;
}

References usb_endpoint::attributes, usb_hub_driver_operations::clear_tt, DBGC, usb_hub::driver, usb_device::ep, usb_port::hub, usb_device::name, rc, strerror(), usb_endpoint::usb, usb_port::usb, USB_ENDPOINT_ATTR_PERIODIC, usb_endpoint_name(), and usb_transaction_translator().

Referenced by usb_endpoint_clear_halt(), and usb_endpoint_close().

usb_endpoint_clear_halt()

int usb_endpoint_clear_halt

(

struct usb_endpoint *

ep

)

Clear endpoint halt (if applicable)

Parameters

ep	USB endpoint

Return values

rc	Return status code

Definition at line 372 of file usb.c.

                                                        {
        struct usb_device *usb = ep->usb;
        unsigned int type;
        int 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;
        }

        return 0;
}

References usb_endpoint::address, usb_endpoint::attributes, DBGC, usb_device::ep, usb_device::name, rc, strerror(), type, usb_endpoint::usb, usb_clear_feature(), USB_ENDPOINT_ATTR_CONTROL, USB_ENDPOINT_ATTR_TYPE_MASK, usb_endpoint_clear_tt(), USB_ENDPOINT_HALT, usb_endpoint_name(), and USB_RECIP_ENDPOINT.

Referenced by usb_endpoint_reset(), and usbblk_open().

usb_endpoint_close()

void usb_endpoint_close

(

struct usb_endpoint *

ep

)

Close USB endpoint.

Parameters

ep	USB endpoint

Definition at line 400 of file usb.c.

                                                    {
        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 );
}

References usb_endpoint::address, assert(), usb_endpoint_host_operations::close, usb_device::ep, usb_endpoint::fill, usb_endpoint::halted, usb_endpoint::host, list_del, usb_endpoint::max, NULL, usb_endpoint::open, usb_endpoint::usb, usb_endpoint_clear_tt(), USB_ENDPOINT_IDX, and usb_flush().

Referenced by efi_usb_close(), efi_usb_open(), hub_close(), hub_open(), register_usb(), unregister_usb(), usbblk_close(), usbblk_open(), usbhid_close(), usbhid_open(), usbnet_close(), and usbnet_open().

usb_endpoint_reset()

static int usb_endpoint_reset ( struct usb_endpoint *  ep )

static

Reset USB endpoint.

Parameters

ep	USB endpoint

Return values

rc	Return status code

Definition at line 430 of file usb.c.

                                                          {
        struct usb_device *usb = ep->usb;
        int rc;

        /* Sanity check */
        assert ( ! list_empty ( &ep->halted ) );

        /* Clear device halt, if applicable */
        if ( ( rc = usb_endpoint_clear_halt ( ep ) ) != 0 )
                return rc;

        /* 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;
        }

        /* 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;
}

References assert(), DBGC, usb_device::ep, usb_endpoint::halted, usb_endpoint::host, INIT_LIST_HEAD, list_del, list_empty, usb_device::name, rc, usb_endpoint_host_operations::reset, strerror(), usb_endpoint::usb, usb_endpoint_clear_halt(), and usb_endpoint_name().

Referenced by usb_control(), usb_message(), usb_step(), and usb_stream().

usb_endpoint_mtu()

static int usb_endpoint_mtu ( struct usb_endpoint *  ep, size_t  mtu  )

static

Update endpoint MTU.

Parameters

ep	USB endpoint
mtu	New MTU

Return values

rc	Return status code

Definition at line 464 of file usb.c.

                                                                    {
        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;
}

References DBGC, usb_device::ep, usb_endpoint::host, mtu, usb_endpoint::mtu, usb_endpoint_host_operations::mtu, usb_device::name, rc, strerror(), usb_endpoint::usb, and usb_endpoint_name().

Referenced by register_usb().

usb_message()

int usb_message	(	struct usb_endpoint *	ep,
		unsigned int	request,
		unsigned int	value,
		unsigned int	index,
		struct io_buffer *	iobuf
	)

Enqueue USB message transfer.

Parameters

ep	USB endpoint
request	Request
value	Value parameter
index	Index parameter
iobuf	I/O buffer

Return values

rc	Return status code

The I/O buffer must have sufficient headroom to contain a setup packet.

Definition at line 492 of file usb.c.

                                            {
        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;
}

References assert(), cpu_to_le16, io_buffer::data, DBGC, ENODEV, usb_device::ep, usb_endpoint::fill, usb_endpoint::halted, usb_endpoint::host, index, usb_setup_packet::index, iob_headroom(), iob_len(), iob_push, usb_setup_packet::len, len, list_empty, memset(), usb_endpoint_host_operations::message, usb_device::name, port, usb_device::port, rc, request, usb_setup_packet::request, strerror(), usb_endpoint::usb, usb_port::usb, USB_DIR_IN, usb_endpoint_name(), usb_endpoint_reset(), value, and usb_setup_packet::value.

Referenced by usb_control().

usb_stream()

int usb_stream	(	struct usb_endpoint *	ep,
		struct io_buffer *	iobuf,
		int	terminate
	)

Enqueue USB stream transfer.

Parameters

ep	USB endpoint
iobuf	I/O buffer
terminate	Terminate using a short packet

Return values

rc	Return status code

Definition at line 546 of file usb.c.

                                 {
        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;
}

References DBGC, ENODEV, usb_device::ep, usb_endpoint::fill, usb_endpoint::halted, usb_endpoint::host, iob_len(), list_empty, usb_endpoint::mtu, usb_device::name, port, usb_device::port, rc, usb_endpoint_host_operations::stream, strerror(), usb_endpoint::usb, usb_port::usb, usb_endpoint_name(), and usb_endpoint_reset().

Referenced by acm_out_transmit(), axge_out_transmit(), dm96xx_out_transmit(), ecm_out_transmit(), efi_usb_sync_transfer(), imux_tx(), iphone_out_transmit(), ncm_out_transmit(), smsc75xx_out_transmit(), smsc95xx_out_transmit(), usb_refill_limit(), usbblk_out_command(), and usbblk_out_data().

usb_complete_err()

void usb_complete_err	(	struct usb_endpoint *	ep,
		struct io_buffer *	iobuf,
		int	rc
	)

Complete transfer (possibly with error)

Parameters

ep	USB endpoint
iobuf	I/O buffer
rc	Completion status code

Definition at line 587 of file usb.c.

                                 {
        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 );
}

References assert(), usb_endpoint_driver_operations::complete, DBGC, usb_endpoint::driver, usb_device::ep, usb_endpoint::fill, usb_endpoint::halted, list_add_tail, list_del, usb_device::name, usb_endpoint::open, rc, strerror(), usb_endpoint::usb, usb_endpoint_name(), and usb_halted.

Referenced by ehci_endpoint_close(), ehci_endpoint_poll(), uhci_endpoint_close(), uhci_endpoint_poll(), usb_complete(), usbio_bulk_in_poll(), usbio_bulk_out_poll(), usbio_control_poll(), usbio_endpoint_close(), xhci_endpoint_close(), and xhci_transfer().

usb_prefill()

int usb_prefill

(

struct usb_endpoint *

ep

)

Prefill endpoint recycled buffer list.

Parameters

ep	USB endpoint

Return values

rc	Return status code

Definition at line 620 of file usb.c.

                                            {
        struct io_buffer *iobuf;
        size_t reserve = ep->reserve;
        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 ( reserve + len );
                if ( ! iobuf ) {
                        rc = -ENOMEM;
                        goto err_alloc;
                }
                iob_reserve ( iobuf, reserve );

                /* Add to recycled buffer list */
                list_add_tail ( &iobuf->list, &ep->recycled );
        }

        return 0;

 err_alloc:
        usb_flush ( ep );
        return rc;
}

References alloc_iob(), assert(), ENOMEM, fill, usb_endpoint::fill, iob_reserve, len, usb_endpoint::len, io_buffer::list, list_add_tail, list_empty, usb_endpoint::max, usb_endpoint::mtu, rc, usb_endpoint::recycled, usb_endpoint::reserve, and usb_flush().

Referenced by efi_usb_async_start(), and ncm_in_prefill().

usb_refill_limit()

int usb_refill_limit	(	struct usb_endpoint *	ep,
		unsigned int	max
	)

Refill endpoint up to specified limit.

Parameters

ep	USB endpoint
max	Fill limit

Return values

rc	Return status code

Definition at line 661 of file usb.c.

                                                                   {
        struct io_buffer *iobuf;
        size_t reserve = ep->reserve;
        size_t len = ( ep->len ? ep->len : ep->mtu );
        int rc;

        /* Sanity checks */
        assert ( ep->open );
        assert ( ep->max > 0 );

        /* Refill endpoint */
        if ( max > ep->max )
                max = ep->max;
        while ( ep->fill < max ) {

                /* Get or allocate buffer */
                if ( list_empty ( &ep->recycled ) ) {
                        /* Recycled buffer list is empty; allocate new buffer */
                        iobuf = alloc_iob ( reserve + len );
                        if ( ! iobuf )
                                return -ENOMEM;
                        iob_reserve ( iobuf, reserve );
                } 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;
}

References alloc_iob(), assert(), ENOMEM, usb_endpoint::fill, iob_len(), iob_put, iob_reserve, len, usb_endpoint::len, io_buffer::list, list_add, list_del, list_empty, list_first_entry, max, usb_endpoint::max, usb_endpoint::mtu, NULL, usb_endpoint::open, rc, usb_endpoint::recycled, usb_endpoint::reserve, and usb_stream().

Referenced by usb_refill(), and usbblk_in_refill().

usb_refill()

int usb_refill

(

struct usb_endpoint *

ep

)

Refill endpoint.

Parameters

ep	USB endpoint

Return values

rc	Return status code

Definition at line 711 of file usb.c.

                                           {
        return usb_refill_limit ( ep, ep->max );
}

References usb_endpoint::max, and usb_refill_limit().

Referenced by efi_usb_timer(), hub_refill(), usbhid_open(), usbhid_refill(), usbkbd_iskey(), usbnet_open(), and usbnet_refill().

usb_flush()

void usb_flush

(

struct usb_endpoint *

ep

)

Discard endpoint recycled buffer list.

Parameters

ep	USB endpoint

Definition at line 720 of file usb.c.

                                           {
        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 );
        }
}

References assert(), free_iob(), io_buffer::list, list_del, list_for_each_entry_safe, usb_endpoint::max, usb_endpoint::open, usb_endpoint::recycled, and tmp.

Referenced by ncm_open(), usb_endpoint_close(), usb_endpoint_open(), and usb_prefill().

usb_control_complete()

static void usb_control_complete ( struct usb_endpoint *  ep, struct io_buffer *  iobuf, int  rc  )

static

Complete USB control transfer.

Parameters

ep	USB endpoint
iobuf	I/O buffer
rc	Completion status code

Definition at line 755 of file usb.c.

                                                                     {
        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 );
}

References usb_device::complete, usb_device::ep, iob_push, io_buffer::list, list_add_tail, rc, usb_control_pseudo_header::rc, and usb_endpoint::usb.

usb_control()

int usb_control	(	struct usb_device *	usb,
		unsigned int	request,
		unsigned int	value,
		unsigned int	index,
		void *	data,
		size_t	len
	)

Issue USB control transaction.

Parameters

usb	USB device
request	Request
value	Value parameter
index	Index parameter
data	Data buffer (if any)
len	Length of data

Return values

rc	Return status code

Definition at line 784 of file usb.c.

                               {
        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 );
                                usb_endpoint_reset ( ep );
                                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;
}

References alloc_iob(), assert(), bus, usb_hub::bus, usb_device::complete, usb_device::control, data, io_buffer::data, DBGC, DBGC_HDA, ENOMEM, ETIMEDOUT, free_iob(), usb_port::hub, index, iob_len(), iob_pull, iob_put, iob_reserve, len, io_buffer::list, list_del, list_first_entry, mdelay(), memcpy(), memset(), usb_device::name, usb_device::port, rc, usb_control_pseudo_header::rc, request, strerror(), usb_endpoint::usb, USB_CONTROL_MAX_WAIT_MS, USB_DIR_IN, usb_endpoint_reset(), usb_message(), usb_poll(), and value.

Referenced by axge_read_register(), axge_write_register(), cdc_get_encapsulated_response(), cdc_send_encapsulated_command(), dm96xx_read_registers(), dm96xx_write_register(), dm96xx_write_registers(), ecm_open(), efi_usb_control_transfer(), iphone_check_link(), iphone_probe(), ncm_open(), ncm_probe(), smscusb_raw_readl(), smscusb_raw_writel(), usb_clear_feature(), usb_get_descriptor(), usb_get_status(), usb_hub_clear_tt_buffer(), usb_hub_set_hub_depth(), usb_set_address(), usb_set_configuration(), usb_set_feature(), usb_set_interface(), usbblk_open(), usbhid_set_idle(), usbhid_set_protocol(), and usbhid_set_report().

usb_get_default_language()

static unsigned int usb_get_default_language ( struct usb_device *  usb )

static

Get default language ID.

Parameters

usb	USB device

Return values

language

Language ID

Definition at line 884 of file usb.c.

                                                                        {
        struct {
                struct usb_descriptor_header header;
                uint16_t language[1];
        } __attribute__ (( packed )) desc;
        unsigned int language;
        int rc;

        /* Get descriptor */
        if ( ( rc = usb_get_descriptor ( usb, 0, USB_STRING_DESCRIPTOR, 0, 0,
                                         &desc.header, sizeof ( desc ) ) ) !=0){
                DBGC ( usb, "USB %s has no default language: %s\n",
                       usb->name, strerror ( rc ) );
                return USB_LANG_ENGLISH;
        }

        /* Use first language ID */
        language = le16_to_cpu ( desc.language[0] );
        DBGC2 ( usb, "USB %s default language %#04x\n", usb->name, language );
        return language;
}

References __attribute__, DBGC, DBGC2, desc, header, le16_to_cpu, usb_device::name, rc, strerror(), usb_get_descriptor(), USB_LANG_ENGLISH, and USB_STRING_DESCRIPTOR.

Referenced by usb_get_string_descriptor().

usb_get_string_descriptor()

int usb_get_string_descriptor	(	struct usb_device *	usb,
		unsigned int	index,
		unsigned int	language,
		char *	buf,
		size_t	len
	)

Get USB string descriptor.

Parameters

usb	USB device
index	String index
language	Language ID, or 0 to use default
buf	Data buffer
len	Length of buffer

Return values

len	String length (excluding NUL), or negative error

Definition at line 916 of file usb.c.

                                                                               {
        struct {
                struct usb_descriptor_header header;
                uint16_t character[len];
        } __attribute__ (( packed )) *desc;
        unsigned int actual;
        unsigned int i;
        int rc;

        /* Use default language ID, if applicable */
        if ( ( language == 0 ) && ( index != 0 ) ) {
                if ( ! usb->language )
                        usb->language = usb_get_default_language ( usb );
                language = usb->language;
        }

        /* 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;

        /* Calculate string length */
        if ( desc->header.len < sizeof ( desc->header ) ) {
                rc = -EINVAL;
                goto err_len;
        }
        actual = ( ( desc->header.len - sizeof ( desc->header ) ) /
                   sizeof ( desc->character[0] ) );

        /* Copy to buffer */
        memset ( buf, 0, len );
        for ( i = 0 ; ( ( i < actual ) && ( i < len ) ) ; i++ )
                buf[i] = le16_to_cpu ( desc->character[i] );

        /* Free buffer */
        free ( desc );

        return actual;

 err_len:
 err_get_descriptor:
        free ( desc );
 err_alloc:
        return rc;
}

References __attribute__, desc, EINVAL, ENOMEM, free, header, index, usb_device::language, le16_to_cpu, usb_descriptor_header::len, len, malloc(), memset(), rc, usb_get_default_language(), usb_get_descriptor(), and USB_STRING_DESCRIPTOR.

Referenced by ecm_fetch_mac(), and usb_settings_fetch().

usb_config_descriptor()

static int usb_config_descriptor ( struct usb_device *  usb, unsigned int  index, struct usb_configuration_descriptor **  config  )

static

Get USB configuration descriptor.

Parameters

usb	USB device
index	Configuration index

Return values

config	Configuration descriptor
rc	Return status code

The configuration descriptor is dynamically allocated and must eventually be freed by the caller.

Definition at line 990 of file usb.c.

                                                                       {
        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;
}

References usb_configuration_descriptor::config, DBGC, EINVAL, ENOMEM, free, index, le16_to_cpu, usb_configuration_descriptor::len, len, malloc(), usb_device::name, rc, strerror(), and usb_get_config_descriptor().

Referenced by usb_autoconfigure().

usb_describe()

static int usb_describe ( struct usb_device *  usb, struct usb_configuration_descriptor *  config, unsigned int  first, uint8_t *  interfaces, struct usb_function_descriptor *  desc  )

static

Describe USB function.

Parameters

usb	USB device
config	Configuration descriptor
first	First interface number
interfaces	Interface list to fill in
desc	Function descriptor to fill in

Return values

rc	Return status code

Definition at line 1053 of file usb.c.

                                                                 {
        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.class, &association->class,
                         sizeof ( desc->class.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.class, &interface->class,
                 sizeof ( desc->class.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;
}

References assert(), usb_interface_association_descriptor::class, usb_interface_association_descriptor::count, DBGC, desc, usb_device::device, ENOENT, ERANGE, first, usb_interface_association_descriptor::first, cdc_union_descriptor::header, cdc_union_descriptor::interface, usb_interface_descriptor::interface, interfaces, usb_configuration_descriptor::interfaces, le16_to_cpu, usb_descriptor_header::len, memcpy(), memset(), usb_device::name, offsetof, usb_device_descriptor::product, typeof(), USB_CLASS_CDC, usb_interface_association_descriptor(), and usb_device_descriptor::vendor.

Referenced by usb_probe_all(), and usb_score().

usb_used()

static int usb_used ( struct usb_device *  usb, unsigned int  count, uint8_t *  interface, uint8_t *  used  )

static

Update list of used interface.

Parameters

usb	USB device
count	Number of interfaces
interface	List of interfaces
used	List of already-used interfaces

Return values

rc	Return status code

Definition at line 1145 of file usb.c.

                                                          {
        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;
}

References count, DBGC, EINVAL, and usb_device::name.

Referenced by usb_probe_all(), and usb_score().

usb_find_driver()

struct usb_driver* usb_find_driver	(	struct usb_function_descriptor *	desc,
		struct usb_device_id **	id
	)

Find USB device driver.

Parameters

desc	Function descriptor

Return values

id	USB device ID, or NULL
driver	USB device driver, or NULL

Definition at line 1167 of file usb.c.

                                                                  {
        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;
}

References usb_class_id::class, usb_driver::class, desc, for_each_table_entry, usb_driver::id_count, usb_driver::ids, usb_class_id::mask, NULL, usb_class_descriptor::scalar, USB_ANY_ID, and USB_DRIVERS.

Referenced by usb_probe(), usb_score(), and usbio_supported().

usb_score()

static int usb_score ( struct usb_device *  usb, struct usb_configuration_descriptor *  config  )

static

Get USB device configuration score.

Parameters

usb	USB device
config	Configuration descriptor

Return values

score

Device configuration score, or negative error

Definition at line 1203 of file usb.c.

                                                                     {
        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;
}

References desc, first, id, usb_configuration_descriptor::interfaces, memset(), rc, usb_driver::score, usb_describe(), usb_find_driver(), and usb_used().

Referenced by usb_autoconfigure().

usb_probe()

static int usb_probe ( struct usb_function *  func, struct usb_configuration_descriptor *  config  )

static

Probe USB device driver.

Parameters

func	USB function
config	Configuration descriptor

Return values

rc	Return status code

Definition at line 1248 of file usb.c.

                                                                     {
        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;
}

References usb_class::class, usb_class_descriptor::class, usb_function_descriptor::class, DBGC, usb_function::desc, usb_function::dev, usb_function::driver, device::driver_name, ENOENT, id, usb_function::id, usb_function::name, usb_driver::probe, usb_function_descriptor::product, usb_class::protocol, rc, strerror(), usb_class::subclass, usb_function::usb, usb_find_driver(), and usb_function_descriptor::vendor.

Referenced by usb_probe_all().

usb_remove()

static void usb_remove ( struct usb_function *  func )

static

Remove USB device driver.

Parameters

func	USB function

Definition at line 1286 of file usb.c.

                                                     {

        /* Remove driver */
        func->driver->remove ( func );
}

References usb_function::driver, and usb_driver::remove.

Referenced by usb_probe_all(), and usb_remove_all().

usb_probe_all()

static void usb_probe_all ( struct usb_device *  usb, struct usb_configuration_descriptor *  config  )

static

Probe all USB device drivers.

Parameters

usb	USB device
config	Configuration descriptor

Definition at line 1299 of file usb.c.

                                                              {
        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_BUSDEV ( bus->address, 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;
        }
}

References usb_device::address, assert(), bus, usb_hub::bus, device_description::bus_type, BUS_TYPE_USB, device::children, usb_class::class, usb_class_descriptor::class, usb_function_descriptor::class, usb_configuration_descriptor::config, usb_function_descriptor::count, DBGC, device::desc, usb_function::desc, usb_function::dev, device_description::device, usb_device::device, device::driver_name, first, free, usb_device::functions, usb_port::hub, INIT_LIST_HEAD, usb_function::interface, usb_configuration_descriptor::interfaces, le16_to_cpu, usb_function::list, list_add_tail, list_del, device_description::location, memset(), device::name, usb_function::name, usb_device::name, device::parent, usb_device::port, usb_device_descriptor::product, usb_function_descriptor::product, usb_class::protocol, rc, device::siblings, snprintf(), usb_class::subclass, usb_function::usb, USB_BUSDEV, usb_describe(), usb_probe(), usb_remove(), usb_used(), device_description::vendor, usb_device_descriptor::vendor, usb_function_descriptor::vendor, and zalloc().

Referenced by usb_autoconfigure().

usb_remove_all()

static void usb_remove_all ( struct usb_device *  usb )

static

Remove all device drivers.

Parameters

usb	USB device

Definition at line 1382 of file usb.c.

                                                      {
        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 );
        }
}

References assert(), device::children, usb_function::dev, free, usb_device::functions, usb_function::list, list_del, list_empty, list_for_each_entry_safe, device::siblings, tmp, usb_function::usb, and usb_remove().

Referenced by usb_autoconfigure(), and usb_deconfigure().

usb_deconfigure()

static void usb_deconfigure ( struct usb_device *  usb )

static

Clear USB device configuration.

Parameters

usb	USB device

Definition at line 1409 of file usb.c.

                                                       {
        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 );
}

References assert(), usb_device::ep, NULL, usb_function::usb, USB_ENDPOINT_IDX, USB_EP0_ADDRESS, usb_remove_all(), and usb_set_configuration().

Referenced by register_usb(), and unregister_usb().

usb_autoconfigure()

static int usb_autoconfigure ( struct usb_device *  usb )

static

Choose our preferred USB device configuration.

Parameters

usb	USB device

Return values

rc	Return status code

Definition at line 1431 of file usb.c.

                                                        {
        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;
}

References usb_configuration_descriptor::config, usb_device_descriptor::configurations, DBGC, DBGC2, usb_device::device, free, index, usb_device::name, NULL, rc, strerror(), usb_config_descriptor(), usb_probe_all(), usb_remove_all(), usb_score(), and usb_set_configuration().

Referenced by register_usb().

alloc_usb()

static struct usb_device* alloc_usb ( struct usb_port *  port )

static

Allocate USB device.

Parameters

port

USB port

Return values

usb	USB device, or NULL on allocation failure

Definition at line 1512 of file usb.c.

                                                               {
        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;
}

References bus, usb_hub::bus, usb_device::complete, usb_device::control, usb_device::functions, usb_device::host, usb_bus::hub, INIT_LIST_HEAD, usb_device::name, usb_hub::name, NULL, port, usb_device::port, snprintf(), usb_hub::usb, usb_control_operations, usb_endpoint_init(), and zalloc().

Referenced by usb_attached().

register_usb()

static int register_usb ( struct usb_device *  usb )

static

Register USB device.

Parameters

usb	USB device

Return values

rc	Return status code

Definition at line 1538 of file usb.c.

                                                   {
        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:
        /* Leave port enabled on failure, to avoid an endless loop of
         * failed device registrations.
         */
 err_enable:
        list_del ( &usb->list );
        port->usb = NULL;
 err_already:
        return rc;
}

References usb_device::address, usb_device_host_operations::address, assert(), bus, usb_hub::bus, usb_class::class, usb_device_descriptor::class, usb_device_host_operations::close, usb_device::control, DBGC, DBGC2, usb_device::device, usb_hub::driver, EALREADY, usb_hub_driver_operations::enable, usb_device::host, usb_bus::hub, le16_to_cpu, usb_device::list, list_add_tail, list_del, mdelay(), mtu, usb_device_descriptor::mtu, usb_endpoint::mtu, usb_device::name, usb_hub::name, NULL, usb_device_host_operations::open, port, usb_device::port, usb_device_descriptor::product, protocol, usb_class::protocol, usb_device_descriptor::protocol, rc, usb_device::speed, usb_hub_driver_operations::speed, strerror(), usb_class::subclass, usb_port::usb, usb_autoconfigure(), usb_bcd(), usb_deconfigure(), usb_endpoint_close(), usb_endpoint_describe(), usb_endpoint_mtu(), usb_endpoint_open(), USB_EP0_ADDRESS, USB_EP0_ATTRIBUTES, USB_EP0_BURST, USB_EP0_DEFAULT_MTU, USB_EP0_INTERVAL, usb_get_device_descriptor(), usb_get_mtu(), USB_PROTO_3_0, USB_RESET_RECOVER_DELAY_MS, USB_SET_ADDRESS_RECOVER_DELAY_MS, usb_speed_name(), and usb_device_descriptor::vendor.

Referenced by usb_attached().

unregister_usb()

static void unregister_usb ( struct usb_device *  usb )

static

Unregister USB device.

Parameters

usb	USB device

Definition at line 1671 of file usb.c.

                                                      {
        struct usb_port *port = usb->port;
        struct usb_hub *hub = port->hub;
        struct io_buffer *iobuf;
        struct io_buffer *tmp;

        DBGC ( usb, "USB %s addr %d %04x:%04x class %d:%d:%d removed\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 );

        /* 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;
}

References usb_device::address, assert(), usb_class::class, usb_device_descriptor::class, usb_device_host_operations::close, usb_device::complete, usb_device::control, DBGC, usb_device::device, usb_hub_driver_operations::disable, usb_hub::driver, free_iob(), usb_device::host, le16_to_cpu, io_buffer::list, usb_device::list, list_del, list_for_each_entry_safe, usb_device::name, NULL, port, usb_device::port, usb_device_descriptor::product, usb_class::protocol, usb_class::subclass, tmp, usb_port::usb, usb_deconfigure(), usb_endpoint_close(), and usb_device_descriptor::vendor.

Referenced by usb_attached(), and usb_detached().

free_usb()

static void free_usb ( struct usb_device *  usb )

static

Free USB device.

Parameters

usb	USB device

Definition at line 1715 of file usb.c.

                                                {
        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 );
}

References assert(), usb_device::complete, usb_device::ep, free, usb_device::functions, list_empty, and NULL.

Referenced by usb_attached(), and usb_detached().

find_usb()

struct usb_device* find_usb	(	struct usb_bus *	bus,
		unsigned int	address
	)

Find USB device by address.

Parameters

bus	USB bus
address	Device address

Return values

usb	USB device, or NULL if not found

Definition at line 1735 of file usb.c.

                                                                           {
        struct usb_device *usb;

        /* Search for a matching non-zero address */
        list_for_each_entry ( usb, &bus->devices, list ) {
                if ( address && ( usb->address == address ) )
                        return usb;
        }

        return NULL;
}

References address, usb_device::address, bus, usb_device::list, list_for_each_entry, and NULL.

Referenced by usb_find_next(), and usb_settings_fetch().

usb_attached()

static int usb_attached ( struct usb_port *  port )

static

Handle newly attached USB device.

Parameters

port

USB port

Return values

rc	Return status code

Definition at line 1760 of file usb.c.

                                                  {
        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;
}

References alloc_usb(), assert(), ENOMEM, free_usb(), NULL, port, rc, register_usb(), and unregister_usb().

Referenced by usb_hotplugged().

usb_detached()

static void usb_detached ( struct usb_port *  port )

static

Handle newly detached USB device.

Parameters

port

USB port

Definition at line 1795 of file usb.c.

                                                   {
        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 );
}

References free_usb(), port, and unregister_usb().

Referenced by unregister_usb_hub(), and usb_hotplugged().

usb_hotplugged()

static int usb_hotplugged ( struct usb_port *  port )

static

Handle newly attached or detached USB device.

Parameters

port

USB port

Return values

rc	Return status code

Definition at line 1818 of file usb.c.

                                                    {
        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;
}

References DBGC, usb_hub::driver, usb_hub::name, port, rc, usb_hub_driver_operations::speed, strerror(), usb_attached(), usb_detached(), and USB_SPEED_NONE.

Referenced by usb_hotplug().

usb_port_changed()

void usb_port_changed

(

struct usb_port *

port

)

Report port status change.

Parameters

port

USB port

Definition at line 1858 of file usb.c.

                                                {

        /* Record hub port status change */
        list_del ( &port->changed );
        list_add_tail ( &port->changed, &usb_changed );
}

References list_add_tail, list_del, port, and usb_changed.

Referenced by ehci_root_poll(), hub_complete(), register_usb_hub(), uhci_root_poll(), and xhci_port_status().

usb_hotplug()

static void usb_hotplug ( void  )

static

Handle newly attached or detached USB device.

Definition at line 1869 of file usb.c.

                                 {
        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 );
        }
}

References assert(), usb_port::changed, INIT_LIST_HEAD, list_del, list_empty, list_first_entry, NULL, port, usb_changed, and usb_hotplugged().

Referenced by register_usb_bus(), and usb_step().

usb_step()

static void usb_step ( struct process *process  __unused )

static

USB process.

Parameters

process

USB process

Definition at line 1896 of file usb.c.

                                                          {
        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();
}

References bus, for_each_usb_bus, usb_endpoint::halted, list_first_entry, NULL, usb_endpoint_reset(), usb_halted, usb_hotplug(), and usb_poll().

PERMANENT_PROCESS()

PERMANENT_PROCESS	(	usb_process	,
		usb_step
	)

USB process.

alloc_usb_hub()

struct usb_hub* alloc_usb_hub	(	struct usb_bus *	bus,
		struct usb_device *	usb,
		unsigned int	ports,
		struct usb_hub_driver_operations *	driver
	)

Allocate USB hub.

Parameters

bus	USB bus
usb	Underlying USB device, if any
ports	Number of ports
driver	Hub driver operations

Return values

hub	USB hub, or NULL on allocation failure

Definition at line 1937 of file usb.c.

                                                                            {
        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;
}

References bus, usb_hub::bus, usb_hub::driver, usb_hub::host, usb_port::hub, INIT_LIST_HEAD, usb_device::name, usb_hub::name, NULL, port, usb_device::port, usb_hub::port, usb_hub::ports, usb_port::protocol, usb_hub::protocol, usb_port::usb, usb_hub::usb, usb_port(), and zalloc().

Referenced by alloc_usb_bus(), and hub_probe().

register_usb_hub()

int register_usb_hub

(

struct usb_hub *

hub

)

Register USB hub.

Parameters

hub

USB hub

Return values

rc	Return status code

Definition at line 1976 of file usb.c.

                                             {
        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;
}

References bus, usb_hub::bus, usb_hub_host_operations::close, usb_hub_driver_operations::close, DBGC, usb_hub::driver, usb_hub::host, usb_port::hub, usb_bus::hub, usb_hub::list, list_add_tail, list_del, mdelay(), usb_hub::name, usb_hub_host_operations::open, usb_hub_driver_operations::open, port, usb_hub::ports, rc, strerror(), usb_poll(), usb_port(), usb_port_changed(), and USB_PORT_DELAY_MS.

Referenced by hub_probe(), and register_usb_bus().

unregister_usb_hub()

void unregister_usb_hub

(

struct usb_hub *

hub

)

Unregister USB hub.

Parameters

hub

USB hub

Definition at line 2030 of file usb.c.

                                                {
        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 );
}

References usb_hub_host_operations::close, usb_hub_driver_operations::close, usb_hub::driver, usb_hub::host, usb_port::hub, INIT_LIST_HEAD, usb_hub::list, list_del, port, usb_hub::ports, usb_detached(), and usb_port().

Referenced by hub_probe(), hub_remove(), register_usb_bus(), and unregister_usb_bus().

free_usb_hub()

void free_usb_hub

(

struct usb_hub *

hub

)

Free USB hub.

Parameters

hub

USB hub

Definition at line 2063 of file usb.c.

                                          {
        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 );
}

References assert(), free, usb_port::hub, list_empty, NULL, port, usb_hub::ports, and usb_port().

Referenced by alloc_usb_bus(), free_usb_bus(), hub_probe(), and hub_remove().

alloc_usb_bus()

struct usb_bus* alloc_usb_bus	(	struct device *	dev,
		unsigned int	ports,
		size_t	mtu,
		struct usb_host_operations *	op
	)

Allocate USB bus.

Parameters

dev	Underlying hardware device
ports	Number of root hub ports
mtu	Largest transfer allowed on the bus
op	Host controller operations

Return values

bus	USB bus, or NULL on allocation failure

Definition at line 2095 of file usb.c.

                                                                              {
        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;
}

References alloc_usb_hub(), bus, usb_bus::dev, free, free_usb_hub(), INIT_LIST_HEAD, mtu, device::name, NULL, op, and zalloc().

Referenced by ehci_probe(), uhci_probe(), usbio_start(), and xhci_register().

register_usb_bus()

int register_usb_bus

(

struct usb_bus *

bus

)

Register USB bus.

Parameters

bus

USB bus

Return values

rc	Return status code

Definition at line 2131 of file usb.c.

                                             {
        int rc;

        /* Sanity checks */
        assert ( bus->hub != NULL );

        /* Assign the first available bus address */
        bus->address = 0;
        while ( find_usb_bus ( bus->address ) != NULL )
                bus->address++;

        /* 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;
}

References assert(), bus, find_usb_bus(), list_add_tail, list_del, NULL, rc, register_usb_hub(), unregister_usb_hub(), usb_buses, and usb_hotplug().

Referenced by ehci_probe(), uhci_probe(), usbio_start(), and xhci_register().

unregister_usb_bus()

void unregister_usb_bus

(

struct usb_bus *

bus

)

Unregister USB bus.

Parameters

bus

USB bus

Definition at line 2171 of file usb.c.

                                                {

        /* 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 ) );
}

References assert(), bus, list_del, list_empty, NULL, and unregister_usb_hub().

Referenced by ehci_probe(), ehci_remove(), uhci_probe(), uhci_remove(), usbio_start(), usbio_stop(), xhci_register(), and xhci_unregister().

free_usb_bus()

void free_usb_bus

(

struct usb_bus *

bus

)

Free USB bus.

Parameters

bus

USB bus

Definition at line 2195 of file usb.c.

                                          {
        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 );
}

References assert(), bus, usb_hub::bus, usb_port::changed, free, free_usb_hub(), usb_port::hub, list_empty, list_for_each_entry, port, usb_device::port, usb_endpoint::usb, usb_changed, and usb_halted.

Referenced by ehci_probe(), ehci_remove(), uhci_probe(), uhci_remove(), usbio_start(), usbio_stop(), xhci_register(), and xhci_unregister().

find_usb_bus()

struct usb_bus* find_usb_bus

(

unsigned int

address

)

Find USB bus by address.

Parameters

address

Bus address

Return values

bus	USB bus, or NULL

Definition at line 2220 of file usb.c.

                                                       {
        struct usb_bus *bus;

        for_each_usb_bus ( bus ) {
                if ( bus->address == address )
                        return bus;
        }

        return NULL;
}

References address, bus, for_each_usb_bus, and NULL.

Referenced by register_usb_bus(), usb_find_next(), and usb_settings_fetch().

find_usb_bus_by_location()

struct usb_bus* find_usb_bus_by_location	(	unsigned int	bus_type,
		unsigned int	location
	)

Find USB bus by device location.

Parameters

bus_type	Bus type
location	Bus location

Return values

bus	USB bus, or NULL

Definition at line 2238 of file usb.c.

                                                                    {
        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;
}

References bus, for_each_usb_bus, and NULL.

Referenced by uhci_root_speed().

usb_alloc_address()

int usb_alloc_address

(

struct usb_bus *

bus

)

Allocate device address.

Parameters

bus

USB bus

Return values

address

Device address, or negative error

Definition at line 2264 of file usb.c.

                                              {
        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;
}

References address, bus, ENOENT, and ffsll.

Referenced by ehci_device_address(), and uhci_device_address().

usb_free_address()

void usb_free_address	(	struct usb_bus *	bus,
		unsigned int	address
	)

Free device address.

Parameters

bus	USB bus
address	Device address

Definition at line 2284 of file usb.c.

                                                                    {

        /* Sanity check */
        assert ( address > 0 );
        assert ( bus->addresses & ( 1ULL << ( address - 1 ) ) );

        /* Mark address as free */
        bus->addresses &= ~( 1ULL << ( address - 1 ) );
}

References address, assert(), and bus.

Referenced by ehci_device_address(), ehci_device_close(), uhci_device_address(), and uhci_device_close().

usb_find_next()

int usb_find_next	(	struct usb_device **	usb,
		uint16_t *	busdev
	)

Find next USB device.

Parameters

usb	USB device to fill in
busdev	Starting bus:dev address

Return values

busdev	Bus:dev address of next USB device
rc	Return status code

Definition at line 2302 of file usb.c.

                                                                {
        struct usb_bus *bus;

        do {
                /* Find USB bus, if any */
                bus = find_usb_bus ( USB_BUS ( *busdev ) );
                if ( ! bus ) {
                        *busdev |= ( USB_BUS ( 1 ) - 1 );
                        continue;
                }

                /* Find USB device, if any */
                *usb = find_usb ( bus, USB_DEV ( *busdev ) );
                if ( *usb )
                        return 0;

        } while ( ++(*busdev) );

        return -ENODEV;
}

References bus, ENODEV, find_usb(), find_usb_bus(), USB_BUS, and USB_DEV.

Referenced by usbscan_exec().

usb_route_string()

unsigned int usb_route_string

(

struct usb_device *

usb

)

Get USB route string.

Parameters

usb	USB device

Return values

route

USB route string

Definition at line 2336 of file usb.c.

                                                         {
        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;
}

References usb_port::address, usb_port::hub, usb_device::port, route(), and usb_hub::usb.

Referenced by xhci_device_address().

usb_root_hub_port()

struct usb_port* usb_root_hub_port

(

struct usb_device *

usb

)

Get USB root hub port.

Parameters

usb	USB device

Return values

port	Root hub port

Definition at line 2356 of file usb.c.

                                                               {
        struct usb_device *parent;

        /* Navigate up to root hub */
        while ( ( parent = usb->port->hub->usb ) )
                usb = parent;

        return usb->port;
}

References usb_port::hub, usb_device::port, and usb_hub::usb.

Referenced by xhci_device_address(), and xhci_device_open().

usb_transaction_translator()

struct usb_port* usb_transaction_translator

(

struct usb_device *

usb

)

Get USB transaction translator.

Parameters

usb	USB device

Return values

port	Transaction translator port, or NULL

Definition at line 2372 of file usb.c.

                                                                        {
        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;
}

References usb_port::hub, NULL, usb_device::port, usb_device::speed, usb_hub::usb, and USB_SPEED_FULL.

Referenced by ehci_endpoint_capabilities(), usb_endpoint_clear_tt(), and xhci_device_open().

REQUIRING_SYMBOL()

REQUIRING_SYMBOL

(

register_usb_bus

)

REQUIRE_OBJECT() [1/2]

REQUIRE_OBJECT

(

config_usb

)

REQUIRE_OBJECT() [2/2]

REQUIRE_OBJECT

(

usbhub

)

Variable Documentation

usb_buses

struct list_head usb_buses = LIST_HEAD_INIT ( usb_buses )

List of USB buses.

Definition at line 45 of file usb.c.

Referenced by register_usb_bus().

usb_changed

struct list_head usb_changed = LIST_HEAD_INIT ( usb_changed )

static

List of changed ports.

Definition at line 48 of file usb.c.

Referenced by free_usb_bus(), usb_hotplug(), and usb_port_changed().

usb_halted

struct list_head usb_halted = LIST_HEAD_INIT ( usb_halted )

static

List of halted endpoints.

Definition at line 51 of file usb.c.

Referenced by free_usb_bus(), usb_complete_err(), and usb_step().

usb_control_operations

struct usb_endpoint_driver_operations usb_control_operations

static

Initial value:

= {
        .complete = usb_control_complete,
}

USB control endpoint driver operations.

Definition at line 769 of file usb.c.

Referenced by alloc_usb().