/*
* drivers/usb/usb.c
*
* (C) Copyright Linus Torvalds 1999
* (C) Copyright Johannes Erdfelt 1999-2001
* (C) Copyright Andreas Gal 1999
* (C) Copyright Gregory P. Smith 1999
* (C) Copyright Deti Fliegl 1999 (new USB architecture)
* (C) Copyright Randy Dunlap 2000
* (C) Copyright David Brownell 2000-2001 (kernel hotplug, usb_device_id,
more docs, etc)
* (C) Copyright Yggdrasil Computing, Inc. 2000
* (usb_device_id matching changes by Adam J. Richter)
* (C) Copyright Greg Kroah-Hartman 2002-2003
*
* NOTE! This is not actually a driver at all, rather this is
* just a collection of helper routines that implement the
* generic USB things that the real drivers can use..
*
* Think of this as a "USB library" rather than anything else.
* It should be considered a slave, with no callbacks. Callbacks
* are evil.
*/
#include <linuxcomp.h>
#include <linux/config.h>
#ifdef CONFIG_USB_DEBUG
#define DEBUG
#else
#undef DEBUG
#endif
#include <linux/module.h>
#include <linux/string.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/interrupt.h> /* for in_interrupt() */
#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/smp_lock.h>
#include <linux/usb.h>
#include <asm/io.h>
#include <asm/scatterlist.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include "hcd.h"
#include "usb.h"
extern int usb_hub_init
(void);
extern void usb_hub_cleanup
(void);
extern int usb_major_init
(void);
extern void usb_major_cleanup
(void);
extern int usb_host_init
(void);
extern void usb_host_cleanup
(void);
int nousb
; /* Disable USB when built into kernel image */
/* Not honored on modular build */
static int generic_probe
(struct device
*dev
)
{
return 0;
}
static int generic_remove
(struct device
*dev
)
{
return 0;
}
static struct device_driver usb_generic_driver
= {
.
name = "usb",
.
bus = &usb_bus_type
,
.
probe = generic_probe
,
.
remove = generic_remove
,
};
static int usb_generic_driver_data
;
/* needs to be called with BKL held */
int usb_probe_interface
(struct device
*dev
)
{
struct usb_interface
* intf
= to_usb_interface
(dev
);
struct usb_driver
* driver
= to_usb_driver
(dev
->driver
);
const struct usb_device_id
*id
;
int error
= -ENODEV
;
dev_dbg
(dev
, "%s\n", __FUNCTION__
);
if (!driver
->probe
)
return error
;
id
= usb_match_id
(intf
, driver
->id_table
);
if (id
) {
dev_dbg
(dev
, "%s - got id\n", __FUNCTION__
);
down
(&driver
->serialize
);
error
= driver
->probe
(intf
, id
);
up
(&driver
->serialize
);
}
if (!error
)
intf
->driver
= driver
;
return error
;
}
int usb_unbind_interface
(struct device
*dev
)
{
struct usb_interface
*intf
= to_usb_interface
(dev
);
struct usb_driver
*driver
= to_usb_driver
(dev
->driver
);
down
(&driver
->serialize
);
/* release all urbs for this interface */
usb_disable_interface
(interface_to_usbdev
(intf
), intf
);
if (intf
->driver
&& intf
->driver
->disconnect
)
intf
->driver
->disconnect
(intf
);
/* force a release and re-initialize the interface */
usb_driver_release_interface
(driver
, intf
);
up
(&driver
->serialize
);
return 0;
}
/**
* usb_register - register a USB driver
* @new_driver: USB operations for the driver
*
* Registers a USB driver with the USB core. The list of unattached
* interfaces will be rescanned whenever a new driver is added, allowing
* the new driver to attach to any recognized devices.
* Returns a negative error code on failure and 0 on success.
*
* NOTE: if you want your driver to use the USB major number, you must call
* usb_register_dev() to enable that functionality. This function no longer
* takes care of that.
*/
int usb_register
(struct usb_driver
*new_driver
)
{
int retval
= 0;
if (nousb
)
return -ENODEV
;
new_driver
->driver.
name = (char *)new_driver
->name
;
new_driver
->driver.
bus = &usb_bus_type
;
new_driver
->driver.
probe = usb_probe_interface
;
new_driver
->driver.
remove = usb_unbind_interface
;
init_MUTEX
(&new_driver
->serialize
);
retval
= driver_register
(&new_driver
->driver
);
if (!retval
) {
info
("registered new driver %s", new_driver
->name
);
usbfs_update_special
();
} else {
err
("problem %d when registering driver %s",
retval
, new_driver
->name
);
}
return retval
;
}
/**
* usb_deregister - unregister a USB driver
* @driver: USB operations of the driver to unregister
* Context: !in_interrupt (), must be called with BKL held
*
* Unlinks the specified driver from the internal USB driver list.
*
* NOTE: If you called usb_register_dev(), you still need to call
* usb_deregister_dev() to clean up your driver's allocated minor numbers,
* this * call will no longer do it for you.
*/
void usb_deregister
(struct usb_driver
*driver
)
{
info
("deregistering driver %s", driver
->name
);
driver_unregister
(&driver
->driver
);
usbfs_update_special
();
}
/**
* usb_ifnum_to_if - get the interface object with a given interface number (usbcore-internal)
* @dev: the device whose current configuration is considered
* @ifnum: the desired interface
*
* This walks the device descriptor for the currently active configuration
* and returns a pointer to the interface with that particular interface
* number, or null.
*
* Note that configuration descriptors are not required to assign interface
* numbers sequentially, so that it would be incorrect to assume that
* the first interface in that descriptor corresponds to interface zero.
* This routine helps device drivers avoid such mistakes.
* However, you should make sure that you do the right thing with any
* alternate settings available for this interfaces.
*/
struct usb_interface
*usb_ifnum_to_if
(struct usb_device
*dev
, unsigned ifnum
)
{
int i
;
for (i
= 0; i
< dev
->actconfig
->desc.
bNumInterfaces; i
++)
if (dev
->actconfig
->interface
[i
]->altsetting
[0]
.
desc.
bInterfaceNumber == ifnum
)
return dev
->actconfig
->interface
[i
];
return NULL
;
}
/**
* usb_epnum_to_ep_desc - get the endpoint object with a given endpoint number
* @dev: the device whose current configuration+altsettings is considered
* @epnum: the desired endpoint, masked with USB_DIR_IN as appropriate.
*
* This walks the device descriptor for the currently active configuration,
* and returns a pointer to the endpoint with that particular endpoint
* number, or null.
*
* Note that interface descriptors are not required to list endpoint
* numbers in any standardized order, so that it would be wrong to
* assume that ep2in precedes either ep5in, ep2out, or even ep1out.
* This routine helps device drivers avoid such mistakes.
*/
struct usb_endpoint_descriptor
*
usb_epnum_to_ep_desc
(struct usb_device
*dev
, unsigned epnum
)
{
int i
, k
;
for (i
= 0; i
< dev
->actconfig
->desc.
bNumInterfaces; i
++) {
struct usb_interface
*intf
;
struct usb_host_interface
*alt
;
/* only endpoints in current altseting are active */
intf
= dev
->actconfig
->interface
[i
];
alt
= intf
->altsetting
+ intf
->act_altsetting
;
for (k
= 0; k
< alt
->desc.
bNumEndpoints; k
++)
if (epnum
== alt
->endpoint
[k
].
desc.
bEndpointAddress)
return &alt
->endpoint
[k
].
desc;
}
return NULL
;
}
/**
* usb_driver_claim_interface - bind a driver to an interface
* @driver: the driver to be bound
* @iface: the interface to which it will be bound
* @priv: driver data associated with that interface
*
* This is used by usb device drivers that need to claim more than one
* interface on a device when probing (audio and acm are current examples).
* No device driver should directly modify internal usb_interface or
* usb_device structure members.
*
* Few drivers should need to use this routine, since the most natural
* way to bind to an interface is to return the private data from
* the driver's probe() method.
*/
int usb_driver_claim_interface
(struct usb_driver
*driver
, struct usb_interface
*iface
, void* priv
)
{
if (!iface
|| !driver
)
return -EINVAL
;
/* this is mainly to lock against usbfs */
lock_kernel
();
if (iface
->driver
) {
unlock_kernel
();
err
("%s driver booted %s off interface %p",
driver
->name
, iface
->driver
->name
, iface
);
return -EBUSY
;
} else {
dbg
("%s driver claimed interface %p", driver
->name
, iface
);
}
iface
->driver
= driver
;
usb_set_intfdata
(iface
, priv
);
unlock_kernel
();
return 0;
}
/**
* usb_interface_claimed - returns true iff an interface is claimed
* @iface: the interface being checked
*
* This should be used by drivers to check other interfaces to see if
* they are available or not. If another driver has claimed the interface,
* they may not claim it. Otherwise it's OK to claim it using
* usb_driver_claim_interface().
*
* Returns true (nonzero) iff the interface is claimed, else false (zero).
*/
int usb_interface_claimed
(struct usb_interface
*iface
)
{
if (!iface
)
return 0;
return (iface
->driver
!= NULL
);
} /* usb_interface_claimed() */
/**
* usb_driver_release_interface - unbind a driver from an interface
* @driver: the driver to be unbound
* @iface: the interface from which it will be unbound
*
* In addition to unbinding the driver, this re-initializes the interface
* by selecting altsetting 0, the default alternate setting.
*
* This can be used by drivers to release an interface without waiting
* for their disconnect() methods to be called.
*
* When the USB subsystem disconnect()s a driver from some interface,
* it automatically invokes this method for that interface. That
* means that even drivers that used usb_driver_claim_interface()
* usually won't need to call this.
*
* This call is synchronous, and may not be used in an interrupt context.
*/
void usb_driver_release_interface
(struct usb_driver
*driver
, struct usb_interface
*iface
)
{
/* this should never happen, don't release something that's not ours */
if (iface
->driver
&& iface
->driver
!= driver
)
return;
usb_set_interface
(interface_to_usbdev
(iface
),
iface
->altsetting
[0].
desc.
bInterfaceNumber,
0);
usb_set_intfdata
(iface
, NULL
);
iface
->driver
= NULL
;
}
/**
* usb_match_id - find first usb_device_id matching device or interface
* @interface: the interface of interest
* @id: array of usb_device_id structures, terminated by zero entry
*
* usb_match_id searches an array of usb_device_id's and returns
* the first one matching the device or interface, or null.
* This is used when binding (or rebinding) a driver to an interface.
* Most USB device drivers will use this indirectly, through the usb core,
* but some layered driver frameworks use it directly.
* These device tables are exported with MODULE_DEVICE_TABLE, through
* modutils and "modules.usbmap", to support the driver loading
* functionality of USB hotplugging.
*
* What Matches:
*
* The "match_flags" element in a usb_device_id controls which
* members are used. If the corresponding bit is set, the
* value in the device_id must match its corresponding member
* in the device or interface descriptor, or else the device_id
* does not match.
*
* "driver_info" is normally used only by device drivers,
* but you can create a wildcard "matches anything" usb_device_id
* as a driver's "modules.usbmap" entry if you provide an id with
* only a nonzero "driver_info" field. If you do this, the USB device
* driver's probe() routine should use additional intelligence to
* decide whether to bind to the specified interface.
*
* What Makes Good usb_device_id Tables:
*
* The match algorithm is very simple, so that intelligence in
* driver selection must come from smart driver id records.
* Unless you have good reasons to use another selection policy,
* provide match elements only in related groups, and order match
* specifiers from specific to general. Use the macros provided
* for that purpose if you can.
*
* The most specific match specifiers use device descriptor
* data. These are commonly used with product-specific matches;
* the USB_DEVICE macro lets you provide vendor and product IDs,
* and you can also match against ranges of product revisions.
* These are widely used for devices with application or vendor
* specific bDeviceClass values.
*
* Matches based on device class/subclass/protocol specifications
* are slightly more general; use the USB_DEVICE_INFO macro, or
* its siblings. These are used with single-function devices
* where bDeviceClass doesn't specify that each interface has
* its own class.
*
* Matches based on interface class/subclass/protocol are the
* most general; they let drivers bind to any interface on a
* multiple-function device. Use the USB_INTERFACE_INFO
* macro, or its siblings, to match class-per-interface style
* devices (as recorded in bDeviceClass).
*
* Within those groups, remember that not all combinations are
* meaningful. For example, don't give a product version range
* without vendor and product IDs; or specify a protocol without
* its associated class and subclass.
*/
const struct usb_device_id
*
usb_match_id
(struct usb_interface
*interface
, const struct usb_device_id
*id
)
{
struct usb_host_interface
*intf
;
struct usb_device
*dev
;
/* proc_connectinfo in devio.c may call us with id == NULL. */
if (id
== NULL
)
return NULL
;
intf
= &interface
->altsetting
[interface
->act_altsetting
];
dev
= interface_to_usbdev
(interface
);
/* It is important to check that id->driver_info is nonzero,
since an entry that is all zeroes except for a nonzero
id->driver_info is the way to create an entry that
indicates that the driver want to examine every
device and interface. */
for (; id
->idVendor
|| id
->bDeviceClass
|| id
->bInterfaceClass
||
id
->driver_info
; id
++) {
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_VENDOR
) &&
id
->idVendor
!= dev
->descriptor.
idVendor)
continue;
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_PRODUCT
) &&
id
->idProduct
!= dev
->descriptor.
idProduct)
continue;
/* No need to test id->bcdDevice_lo != 0, since 0 is never
greater than any unsigned number. */
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_LO
) &&
(id
->bcdDevice_lo
> dev
->descriptor.
bcdDevice))
continue;
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_HI
) &&
(id
->bcdDevice_hi
< dev
->descriptor.
bcdDevice))
continue;
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_CLASS
) &&
(id
->bDeviceClass
!= dev
->descriptor.
bDeviceClass))
continue;
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_SUBCLASS
) &&
(id
->bDeviceSubClass
!= dev
->descriptor.
bDeviceSubClass))
continue;
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_PROTOCOL
) &&
(id
->bDeviceProtocol
!= dev
->descriptor.
bDeviceProtocol))
continue;
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_CLASS
) &&
(id
->bInterfaceClass
!= intf
->desc.
bInterfaceClass))
continue;
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_SUBCLASS
) &&
(id
->bInterfaceSubClass
!= intf
->desc.
bInterfaceSubClass))
continue;
if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_PROTOCOL
) &&
(id
->bInterfaceProtocol
!= intf
->desc.
bInterfaceProtocol))
continue;
return id
;
}
return NULL
;
}
/**
* usb_find_interface - find usb_interface pointer for driver and device
* @drv: the driver whose current configuration is considered
* @minor: the minor number of the desired device
*
* This walks the driver device list and returns a pointer to the interface
* with the matching minor. Note, this only works for devices that share the
* USB major number.
*/
struct usb_interface
*usb_find_interface
(struct usb_driver
*drv
, int minor
)
{
struct list_head
*entry
;
struct device
*dev
;
struct usb_interface
*intf
;
list_for_each
(entry
, &drv
->driver.
devices) {
dev
= container_of
(entry
, struct device
, driver_list
);
/* can't look at usb devices, only interfaces */
if (dev
->driver
== &usb_generic_driver
)
continue;
intf
= to_usb_interface
(dev
);
if (intf
->minor
== -1)
continue;
if (intf
->minor
== minor
)
return intf
;
}
/* no device found that matches */
return NULL
;
}
static int usb_device_match
(struct device
*dev
, struct device_driver
*drv
)
{
struct usb_interface
*intf
;
struct usb_driver
*usb_drv
;
const struct usb_device_id
*id
;
/* check for generic driver, which we don't match any device with */
if (drv
== &usb_generic_driver
)
return 0;
intf
= to_usb_interface
(dev
);
usb_drv
= to_usb_driver
(drv
);
id
= usb_drv
->id_table
;
id
= usb_match_id
(intf
, usb_drv
->id_table
);
if (id
)
return 1;
return 0;
}
#ifdef CONFIG_HOTPLUG
/*
* USB hotplugging invokes what /proc/sys/kernel/hotplug says
* (normally /sbin/hotplug) when USB devices get added or removed.
*
* This invokes a user mode policy agent, typically helping to load driver
* or other modules, configure the device, and more. Drivers can provide
* a MODULE_DEVICE_TABLE to help with module loading subtasks.
*
* We're called either from khubd (the typical case) or from root hub
* (init, kapmd, modprobe, rmmod, etc), but the agents need to handle
* delays in event delivery. Use sysfs (and DEVPATH) to make sure the
* device (and this configuration!) are still present.
*/
static int usb_hotplug
(struct device
*dev
, char **envp
, int num_envp
,
char *buffer
, int buffer_size
)
{
struct usb_interface
*intf
;
struct usb_device
*usb_dev
;
char *scratch
;
int i
= 0;
int length
= 0;
dbg
("%s", __FUNCTION__
);
if (!dev
)
return -ENODEV
;
/* Must check driver_data here, as on remove driver is always NULL */
if ((dev
->driver
== &usb_generic_driver
) ||
(dev
->driver_data
== &usb_generic_driver_data
))
return 0;
intf
= to_usb_interface
(dev
);
usb_dev
= interface_to_usbdev
(intf
);
if (usb_dev
->devnum
< 0) {
dbg
("device already deleted ??");
return -ENODEV
;
}
if (!usb_dev
->bus
) {
dbg
("bus already removed?");
return -ENODEV
;
}
scratch
= buffer
;
#ifdef CONFIG_USB_DEVICEFS
/* If this is available, userspace programs can directly read
* all the device descriptors we don't tell them about. Or
* even act as usermode drivers.
*
* FIXME reduce hardwired intelligence here
*/
envp
[i
++] = scratch
;
length
+= snprintf (scratch
, buffer_size
- length
,
"DEVICE=/proc/bus/usb/%03d/%03d",
usb_dev
->bus
->busnum
, usb_dev
->devnum
);
if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
return -ENOMEM
;
++length
;
scratch
+= length
;
#endif
/* per-device configurations are common */
envp
[i
++] = scratch
;
length
+= snprintf (scratch
, buffer_size
- length
, "PRODUCT=%x/%x/%x",
usb_dev
->descriptor.
idVendor,
usb_dev
->descriptor.
idProduct,
usb_dev
->descriptor.
bcdDevice);
if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
return -ENOMEM
;
++length
;
scratch
+= length
;
/* class-based driver binding models */
envp
[i
++] = scratch
;
length
+= snprintf (scratch
, buffer_size
- length
, "TYPE=%d/%d/%d",
usb_dev
->descriptor.
bDeviceClass,
usb_dev
->descriptor.
bDeviceSubClass,
usb_dev
->descriptor.
bDeviceProtocol);
if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
return -ENOMEM
;
++length
;
scratch
+= length
;
if (usb_dev
->descriptor.
bDeviceClass == 0) {
int alt
= intf
->act_altsetting
;
/* 2.4 only exposed interface zero. in 2.5, hotplug
* agents are called for all interfaces, and can use
* $DEVPATH/bInterfaceNumber if necessary.
*/
envp
[i
++] = scratch
;
length
+= snprintf (scratch
, buffer_size
- length
,
"INTERFACE=%d/%d/%d",
intf
->altsetting
[alt
].
desc.
bInterfaceClass,
intf
->altsetting
[alt
].
desc.
bInterfaceSubClass,
intf
->altsetting
[alt
].
desc.
bInterfaceProtocol);
if ((buffer_size
- length
<= 0) || (i
>= num_envp
))
return -ENOMEM
;
++length
;
scratch
+= length
;
}
envp
[i
++] = 0;
return 0;
}
#else
static int usb_hotplug
(struct device
*dev
, char **envp
,
int num_envp
, char *buffer
, int buffer_size
)
{
return -ENODEV
;
}
#endif /* CONFIG_HOTPLUG */
/**
* usb_release_dev - free a usb device structure when all users of it are finished.
* @dev: device that's been disconnected
*
* Will be called only by the device core when all users of this usb device are
* done.
*/
static void usb_release_dev
(struct device
*dev
)
{
struct usb_device
*udev
;
udev
= to_usb_device
(dev
);
if (udev
->bus
&& udev
->bus
->op
&& udev
->bus
->op
->deallocate
)
udev
->bus
->op
->deallocate
(udev
);
usb_destroy_configuration
(udev
);
usb_bus_put
(udev
->bus
);
kfree
(udev
);
}
/**
* usb_alloc_dev - allocate a usb device structure (usbcore-internal)
* @parent: hub to which device is connected
* @bus: bus used to access the device
* Context: !in_interrupt ()
*
* Only hub drivers (including virtual root hub drivers for host
* controllers) should ever call this.
*
* This call is synchronous, and may not be used in an interrupt context.
*/
struct usb_device
*usb_alloc_dev
(struct usb_device
*parent
, struct usb_bus
*bus
)
{
struct usb_device
*dev
;
dev
= kmalloc
(sizeof(*dev
), GFP_KERNEL
);
if (!dev
)
return NULL
;
memset(dev
, 0, sizeof(*dev
));
bus
= usb_bus_get
(bus
);
if (!bus
) {
kfree
(dev
);
return NULL
;
}
device_initialize
(&dev
->dev
);
dev
->dev.
release = usb_release_dev
;
dev
->state
= USB_STATE_ATTACHED
;
if (!parent
)
dev
->devpath
[0] = '0';
dev
->bus
= bus
;
dev
->parent
= parent
;
INIT_LIST_HEAD
(&dev
->filelist
);
init_MUTEX
(&dev
->serialize
);
if (dev
->bus
->op
->allocate
)
dev
->bus
->op
->allocate
(dev
);
return dev
;
}
/**
* usb_get_dev - increments the reference count of the usb device structure
* @dev: the device being referenced
*
* Each live reference to a device should be refcounted.
*
* Drivers for USB interfaces should normally record such references in
* their probe() methods, when they bind to an interface, and release
* them by calling usb_put_dev(), in their disconnect() methods.
*
* A pointer to the device with the incremented reference counter is returned.
*/
struct usb_device
*usb_get_dev
(struct usb_device
*dev
)
{
struct device
*tmp
;
if (!dev
)
return NULL
;
tmp
= get_device
(&dev
->dev
);
if (tmp
)
return to_usb_device
(tmp
);
else
return NULL
;
}
/**
* usb_put_dev - release a use of the usb device structure
* @dev: device that's been disconnected
*
* Must be called when a user of a device is finished with it. When the last
* user of the device calls this function, the memory of the device is freed.
*/
void usb_put_dev
(struct usb_device
*dev
)
{
if (dev
)
put_device
(&dev
->dev
);
}
static struct usb_device
*match_device
(struct usb_device
*dev
,
u16 vendor_id
, u16 product_id
)
{
struct usb_device
*ret_dev
= NULL
;
int child
;
dbg
("looking at vendor %d, product %d",
dev
->descriptor.
idVendor,
dev
->descriptor.
idProduct);
/* see if this device matches */
if ((dev
->descriptor.
idVendor == vendor_id
) &&
(dev
->descriptor.
idProduct == product_id
)) {
dbg
("found the device!");
ret_dev
= usb_get_dev
(dev
);
goto exit;
}
/* look through all of the children of this device */
for (child
= 0; child
< dev
->maxchild
; ++child
) {
if (dev
->children
[child
]) {
ret_dev
= match_device
(dev
->children
[child
],
vendor_id
, product_id
);
if (ret_dev
)
goto exit;
}
}
exit:
return ret_dev
;
}
/**
* usb_find_device - find a specific usb device in the system
* @vendor_id: the vendor id of the device to find
* @product_id: the product id of the device to find
*
* Returns a pointer to a struct usb_device if such a specified usb
* device is present in the system currently. The usage count of the
* device will be incremented if a device is found. Make sure to call
* usb_put_dev() when the caller is finished with the device.
*
* If a device with the specified vendor and product id is not found,
* NULL is returned.
*/
struct usb_device
*usb_find_device
(u16 vendor_id
, u16 product_id
)
{
struct list_head
*buslist
;
struct usb_bus
*bus
;
struct usb_device
*dev
= NULL
;
down
(&usb_bus_list_lock
);
for (buslist
= usb_bus_list.
next;
buslist
!= &usb_bus_list
;
buslist
= buslist
->next
) {
bus
= container_of
(buslist
, struct usb_bus
, bus_list
);
dev
= match_device
(bus
->root_hub
, vendor_id
, product_id
);
if (dev
)
goto exit;
}
exit:
up
(&usb_bus_list_lock
);
return dev
;
}
/**
* usb_get_current_frame_number - return current bus frame number
* @dev: the device whose bus is being queried
*
* Returns the current frame number for the USB host controller
* used with the given USB device. This can be used when scheduling
* isochronous requests.
*
* Note that different kinds of host controller have different
* "scheduling horizons". While one type might support scheduling only
* 32 frames into the future, others could support scheduling up to
* 1024 frames into the future.
*/
int usb_get_current_frame_number
(struct usb_device
*dev
)
{
return dev
->bus
->op
->get_frame_number
(dev
);
}
/*-------------------------------------------------------------------*/
/*
* __usb_get_extra_descriptor() finds a descriptor of specific type in the
* extra field of the interface and endpoint descriptor structs.
*/
int __usb_get_extra_descriptor
(char *buffer
, unsigned size
, unsigned char type
, void **ptr
)
{
struct usb_descriptor_header
*header
;
while (size
>= sizeof(struct usb_descriptor_header
)) {
header
= (struct usb_descriptor_header
*)buffer
;
if (header
->bLength
< 2) {
err
("invalid descriptor length of %d", header
->bLength
);
return -1;
}
if (header
->bDescriptorType
== type
) {
*ptr
= header
;
return 0;
}
buffer
+= header
->bLength
;
size
-= header
->bLength
;
}
return -1;
}
/**
* usb_disconnect - disconnect a device (usbcore-internal)
* @pdev: pointer to device being disconnected
* Context: !in_interrupt ()
*
* Something got disconnected. Get rid of it, and all of its children.
*
* Only hub drivers (including virtual root hub drivers for host
* controllers) should ever call this.
*
* This call is synchronous, and may not be used in an interrupt context.
*/
void usb_disconnect
(struct usb_device
**pdev
)
{
struct usb_device
*dev
= *pdev
;
struct usb_bus
*bus
;
struct usb_operations
*ops
;
int i
;
might_sleep
();
if (!dev
) {
pr_debug
("%s nodev\n", __FUNCTION__
);
return;
}
bus
= dev
->bus
;
if (!bus
) {
pr_debug
("%s nobus\n", __FUNCTION__
);
return;
}
ops
= bus
->op
;
*pdev
= NULL
;
/* mark the device as inactive, so any further urb submissions for
* this device will fail.
*/
dev
->state
= USB_STATE_NOTATTACHED
;
down
(&dev
->serialize
);
dev_info
(&dev
->dev
, "USB disconnect, address %d\n", dev
->devnum
);
/* Free up all the children before we remove this device */
for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
struct usb_device
**child
= dev
->children
+ i
;
if (*child
)
usb_disconnect
(child
);
}
/* deallocate hcd/hardware state ... nuking all pending urbs and
* cleaning up all state associated with the current configuration
*/
usb_disable_device
(dev
, 0);
dev_dbg
(&dev
->dev
, "unregistering device\n");
/* Free the device number and remove the /proc/bus/usb entry */
if (dev
->devnum
> 0) {
clear_bit
(dev
->devnum
, dev
->bus
->devmap.
devicemap);
usbfs_remove_device
(dev
);
}
up
(&dev
->serialize
);
device_unregister
(&dev
->dev
);
}
/**
* usb_choose_address - pick device address (usbcore-internal)
* @dev: newly detected device (in DEFAULT state)
*
* Picks a device address. It's up to the hub (or root hub) driver
* to handle and manage enumeration, starting from the DEFAULT state.
* Only hub drivers (but not virtual root hub drivers for host
* controllers) should ever call this.
*/
void usb_choose_address
(struct usb_device
*dev
)
{
int devnum
;
// FIXME needs locking for SMP!!
/* why? this is called only from the hub thread,
* which hopefully doesn't run on multiple CPU's simultaneously 8-)
*/
/* Try to allocate the next devnum beginning at bus->devnum_next. */
devnum
= find_next_zero_bit
(dev
->bus
->devmap.
devicemap, 128, dev
->bus
->devnum_next
);
if (devnum
>= 128)
devnum
= find_next_zero_bit
(dev
->bus
->devmap.
devicemap, 128, 1);
dev
->bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
if (devnum
< 128) {
set_bit
(devnum
, dev
->bus
->devmap.
devicemap);
dev
->devnum
= devnum
;
}
}
// hub-only!! ... and only exported for reset/reinit path.
// otherwise used internally, for usb_new_device()
int usb_set_address
(struct usb_device
*dev
)
{
int retval
;
if (dev
->devnum
== 0)
return -EINVAL
;
if (dev
->state
!= USB_STATE_DEFAULT
&& dev
->state
!= USB_STATE_ADDRESS
)
return -EINVAL
;
retval
= usb_control_msg
(dev
, usb_snddefctrl
(dev
), USB_REQ_SET_ADDRESS
,
0, dev
->devnum
, 0, NULL
, 0, HZ
* USB_CTRL_SET_TIMEOUT
);
if (retval
== 0)
dev
->state
= USB_STATE_ADDRESS
;
return retval
;
}
/*
* By the time we get here, we chose a new device address
* and is in the default state. We need to identify the thing and
* get the ball rolling..
*
* Returns 0 for success, != 0 for error.
*
* This call is synchronous, and may not be used in an interrupt context.
*
* Only the hub driver should ever call this; root hub registration
* uses it only indirectly.
*/
#define NEW_DEVICE_RETRYS 2
#define SET_ADDRESS_RETRYS 2
int usb_new_device
(struct usb_device
*dev
, struct device
*parent
)
{
int err
= -EINVAL
;
int i
;
int j
;
/*
* Set the driver for the usb device to point to the "generic" driver.
* This prevents the main usb device from being sent to the usb bus
* probe function. Yes, it's a hack, but a nice one :)
*
* Do it asap, so more driver model stuff (like the device.h message
* utilities) can be used in hcd submit/unlink code paths.
*/
usb_generic_driver.
bus = &usb_bus_type
;
dev
->dev.
parent = parent
;
dev
->dev.
driver = &usb_generic_driver
;
dev
->dev.
bus = &usb_bus_type
;
dev
->dev.
driver_data = &usb_generic_driver_data
;
if (dev
->dev.
bus_id[0] == 0)
sprintf26
(&dev
->dev.
bus_id[0], "%d-%s",
dev
->bus
->busnum
, dev
->devpath
);
/* dma masks come from the controller; readonly, except to hcd */
dev
->dev.
dma_mask = parent
->dma_mask
;
/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
* it's fixed size except for full speed devices.
*/
switch (dev
->speed
) {
case USB_SPEED_HIGH
: /* fixed at 64 */
i
= 64;
break;
case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
/* to determine the ep0 maxpacket size, read the first 8
* bytes from the device descriptor to get bMaxPacketSize0;
* then correct our initial (small) guess.
*/
// FALLTHROUGH
case USB_SPEED_LOW
: /* fixed at 8 */
i
= 8;
break;
default:
goto fail
;
}
dev
->epmaxpacketin
[0] = i
;
dev
->epmaxpacketout
[0] = i
;
for (i
= 0; i
< NEW_DEVICE_RETRYS
; ++i
) {
for (j
= 0; j
< SET_ADDRESS_RETRYS
; ++j
) {
err
= usb_set_address
(dev
);
if (err
>= 0)
break;
wait_ms
(200);
}
if (err
< 0) {
dev_err
(&dev
->dev
,
"device not accepting address %d, error %d\n",
dev
->devnum
, err
);
goto fail
;
}
wait_ms
(10); /* Let the SET_ADDRESS settle */
/* high and low speed devices don't need this... */
err
= usb_get_descriptor
(dev
, USB_DT_DEVICE
, 0, &dev
->descriptor
, 8);
if (err
>= 8)
break;
wait_ms
(100);
}
if (err
< 8) {
dev_err
(&dev
->dev
, "device descriptor read/8, error %d\n", err
);
goto fail
;
}
if (dev
->speed
== USB_SPEED_FULL
) {
usb_disable_endpoint
(dev
, 0);
usb_endpoint_running
(dev
, 0, 1);
usb_endpoint_running
(dev
, 0, 0);
dev
->epmaxpacketin
[0] = dev
->descriptor.
bMaxPacketSize0;
dev
->epmaxpacketout
[0] = dev
->descriptor.
bMaxPacketSize0;
}
/* USB device state == addressed ... still not usable */
err
= usb_get_device_descriptor
(dev
);
if (err
< (signed)sizeof(dev
->descriptor
)) {
dev_err
(&dev
->dev
, "device descriptor read/all, error %d\n", err
);
goto fail
;
}
err
= usb_get_configuration
(dev
);
if (err
< 0) {
dev_err
(&dev
->dev
, "can't read configurations, error %d\n",
err
);
goto fail
;
}
/* Tell the world! */
dev_dbg
(&dev
->dev
, "new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
dev
->descriptor.
iManufacturer, dev
->descriptor.
iProduct, dev
->descriptor.
iSerialNumber);
#ifdef DEBUG
if (dev
->descriptor.
iProduct)
usb_show_string
(dev
, "Product", dev
->descriptor.
iProduct);
if (dev
->descriptor.
iManufacturer)
usb_show_string
(dev
, "Manufacturer", dev
->descriptor.
iManufacturer);
if (dev
->descriptor.
iSerialNumber)
usb_show_string
(dev
, "SerialNumber", dev
->descriptor.
iSerialNumber);
#endif
/* put device-specific files into sysfs */
err
= device_add
(&dev
->dev
);
if (err
) {
dev_err
(&dev
->dev
, "can't device_add, error %d\n", err
);
goto fail
;
}
usb_create_driverfs_dev_files
(dev
);
/* choose and set the configuration. that registers the interfaces
* with the driver core, and lets usb device drivers bind to them.
*/
if (dev
->descriptor.
bNumConfigurations != 1) {
dev_info
(&dev
->dev
,
"configuration #%d chosen from %d choices\n",
dev
->config
[0].
desc.
bConfigurationValue,
dev
->descriptor.
bNumConfigurations);
}
err
= usb_set_configuration
(dev
,
dev
->config
[0].
desc.
bConfigurationValue);
if (err
) {
dev_err
(&dev
->dev
, "can't set config #%d, error %d\n",
dev
->config
[0].
desc.
bConfigurationValue, err
);
device_del
(&dev
->dev
);
goto fail
;
}
/* USB device state == configured ... usable */
/* add a /proc/bus/usb entry */
usbfs_add_device
(dev
);
return 0;
fail
:
dev
->state
= USB_STATE_DEFAULT
;
clear_bit
(dev
->devnum
, dev
->bus
->devmap.
devicemap);
dev
->devnum
= -1;
return err
;
}
/**
* usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
* @dev: device the buffer will be used with
* @size: requested buffer size
* @mem_flags: affect whether allocation may block
* @dma: used to return DMA address of buffer
*
* Return value is either null (indicating no buffer could be allocated), or
* the cpu-space pointer to a buffer that may be used to perform DMA to the
* specified device. Such cpu-space buffers are returned along with the DMA
* address (through the pointer provided).
*
* These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags
* to avoid behaviors like using "DMA bounce buffers", or tying down I/O
* mapping hardware for long idle periods. The implementation varies between
* platforms, depending on details of how DMA will work to this device.
* Using these buffers also helps prevent cacheline sharing problems on
* architectures where CPU caches are not DMA-coherent.
*
* When the buffer is no longer used, free it with usb_buffer_free().
*/
void *usb_buffer_alloc
(
struct usb_device
*dev
,
size_t size
,
int mem_flags
,
dma_addr_t
*dma
)
{
if (!dev
|| !dev
->bus
|| !dev
->bus
->op
|| !dev
->bus
->op
->buffer_alloc
)
return 0;
return dev
->bus
->op
->buffer_alloc
(dev
->bus
, size
, mem_flags
, dma
);
}
/**
* usb_buffer_free - free memory allocated with usb_buffer_alloc()
* @dev: device the buffer was used with
* @size: requested buffer size
* @addr: CPU address of buffer
* @dma: DMA address of buffer
*
* This reclaims an I/O buffer, letting it be reused. The memory must have
* been allocated using usb_buffer_alloc(), and the parameters must match
* those provided in that allocation request.
*/
void usb_buffer_free
(
struct usb_device
*dev
,
size_t size
,
void *addr
,
dma_addr_t dma
)
{
if (!dev
|| !dev
->bus
|| !dev
->bus
->op
|| !dev
->bus
->op
->buffer_free
)
return;
dev
->bus
->op
->buffer_free
(dev
->bus
, size
, addr
, dma
);
}
/**
* usb_buffer_map - create DMA mapping(s) for an urb
* @urb: urb whose transfer_buffer/setup_packet will be mapped
*
* Return value is either null (indicating no buffer could be mapped), or
* the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are
* added to urb->transfer_flags if the operation succeeds. If the device
* is connected to this system through a non-DMA controller, this operation
* always succeeds.
*
* This call would normally be used for an urb which is reused, perhaps
* as the target of a large periodic transfer, with usb_buffer_dmasync()
* calls to synchronize memory and dma state.
*
* Reverse the effect of this call with usb_buffer_unmap().
*/
struct urb
*usb_buffer_map
(struct urb
*urb
)
{
struct usb_bus
*bus
;
struct device
*controller
;
if (!urb
|| !urb
->dev
|| !(bus
= urb
->dev
->bus
)
|| !(controller
= bus
->controller
))
return 0;
if (controller
->dma_mask
) {
urb
->transfer_dma
= dma_map_single
(controller
,
urb
->transfer_buffer
, urb
->transfer_buffer_length
,
usb_pipein
(urb
->pipe
)
? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
if (usb_pipecontrol
(urb
->pipe
))
urb
->setup_dma
= dma_map_single
(controller
,
urb
->setup_packet
,
sizeof (struct usb_ctrlrequest
),
DMA_TO_DEVICE
);
// FIXME generic api broken like pci, can't report errors
// if (urb->transfer_dma == DMA_ADDR_INVALID) return 0;
} else
urb
->transfer_dma
= ~
0;
urb
->transfer_flags
|= (URB_NO_TRANSFER_DMA_MAP
| URB_NO_SETUP_DMA_MAP
);
return urb
;
}
/**
* usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s)
* @urb: urb whose transfer_buffer/setup_packet will be synchronized
*/
void usb_buffer_dmasync
(struct urb
*urb
)
{
struct usb_bus
*bus
;
struct device
*controller
;
if (!urb
|| !(urb
->transfer_flags
& URB_NO_TRANSFER_DMA_MAP
)
|| !urb
->dev
|| !(bus
= urb
->dev
->bus
)
|| !(controller
= bus
->controller
))
return;
if (controller
->dma_mask
) {
dma_sync_single
(controller
,
urb
->transfer_dma
, urb
->transfer_buffer_length
,
usb_pipein
(urb
->pipe
)
? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
if (usb_pipecontrol
(urb
->pipe
))
dma_sync_single
(controller
,
urb
->setup_dma
,
sizeof (struct usb_ctrlrequest
),
DMA_TO_DEVICE
);
}
}
/**
* usb_buffer_unmap - free DMA mapping(s) for an urb
* @urb: urb whose transfer_buffer will be unmapped
*
* Reverses the effect of usb_buffer_map().
*/
void usb_buffer_unmap
(struct urb
*urb
)
{
struct usb_bus
*bus
;
struct device
*controller
;
if (!urb
|| !(urb
->transfer_flags
& URB_NO_TRANSFER_DMA_MAP
)
|| !urb
->dev
|| !(bus
= urb
->dev
->bus
)
|| !(controller
= bus
->controller
))
return;
if (controller
->dma_mask
) {
dma_unmap_single
(controller
,
urb
->transfer_dma
, urb
->transfer_buffer_length
,
usb_pipein
(urb
->pipe
)
? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
if (usb_pipecontrol
(urb
->pipe
))
dma_unmap_single
(controller
,
urb
->setup_dma
,
sizeof (struct usb_ctrlrequest
),
DMA_TO_DEVICE
);
}
urb
->transfer_flags
&= ~
(URB_NO_TRANSFER_DMA_MAP
| URB_NO_SETUP_DMA_MAP
);
}
/**
* usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint
* @dev: device to which the scatterlist will be mapped
* @pipe: endpoint defining the mapping direction
* @sg: the scatterlist to map
* @nents: the number of entries in the scatterlist
*
* Return value is either < 0 (indicating no buffers could be mapped), or
* the number of DMA mapping array entries in the scatterlist.
*
* The caller is responsible for placing the resulting DMA addresses from
* the scatterlist into URB transfer buffer pointers, and for setting the
* URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs.
*
* Top I/O rates come from queuing URBs, instead of waiting for each one
* to complete before starting the next I/O. This is particularly easy
* to do with scatterlists. Just allocate and submit one URB for each DMA
* mapping entry returned, stopping on the first error or when all succeed.
* Better yet, use the usb_sg_*() calls, which do that (and more) for you.
*
* This call would normally be used when translating scatterlist requests,
* rather than usb_buffer_map(), since on some hardware (with IOMMUs) it
* may be able to coalesce mappings for improved I/O efficiency.
*
* Reverse the effect of this call with usb_buffer_unmap_sg().
*/
int usb_buffer_map_sg
(struct usb_device
*dev
, unsigned pipe
,
struct scatterlist
*sg
, int nents
)
{
struct usb_bus
*bus
;
struct device
*controller
;
if (!dev
|| usb_pipecontrol
(pipe
)
|| !(bus
= dev
->bus
)
|| !(controller
= bus
->controller
)
|| !controller
->dma_mask
)
return -1;
// FIXME generic api broken like pci, can't report errors
return dma_map_sg
(controller
, sg
, nents
,
usb_pipein
(pipe
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
}
/**
* usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s)
* @dev: device to which the scatterlist will be mapped
* @pipe: endpoint defining the mapping direction
* @sg: the scatterlist to synchronize
* @n_hw_ents: the positive return value from usb_buffer_map_sg
*
* Use this when you are re-using a scatterlist's data buffers for
* another USB request.
*/
void usb_buffer_dmasync_sg
(struct usb_device
*dev
, unsigned pipe
,
struct scatterlist
*sg
, int n_hw_ents
)
{
struct usb_bus
*bus
;
struct device
*controller
;
if (!dev
|| !(bus
= dev
->bus
)
|| !(controller
= bus
->controller
)
|| !controller
->dma_mask
)
return;
dma_sync_sg
(controller
, sg
, n_hw_ents
,
usb_pipein
(pipe
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
}
/**
* usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist
* @dev: device to which the scatterlist will be mapped
* @pipe: endpoint defining the mapping direction
* @sg: the scatterlist to unmap
* @n_hw_ents: the positive return value from usb_buffer_map_sg
*
* Reverses the effect of usb_buffer_map_sg().
*/
void usb_buffer_unmap_sg
(struct usb_device
*dev
, unsigned pipe
,
struct scatterlist
*sg
, int n_hw_ents
)
{
struct usb_bus
*bus
;
struct device
*controller
;
if (!dev
|| !(bus
= dev
->bus
)
|| !(controller
= bus
->controller
)
|| !controller
->dma_mask
)
return;
dma_unmap_sg
(controller
, sg
, n_hw_ents
,
usb_pipein
(pipe
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
);
}
static int usb_device_suspend
(struct device
*dev
, u32 state
)
{
struct usb_interface
*intf
;
struct usb_driver
*driver
;
if ((dev
->driver
== NULL
) ||
(dev
->driver
== &usb_generic_driver
) ||
(dev
->driver_data
== &usb_generic_driver_data
))
return 0;
intf
= to_usb_interface
(dev
);
driver
= to_usb_driver
(dev
->driver
);
if (driver
->suspend
)
return driver
->suspend
(intf
, state
);
return 0;
}
static int usb_device_resume
(struct device
*dev
)
{
struct usb_interface
*intf
;
struct usb_driver
*driver
;
if ((dev
->driver
== NULL
) ||
(dev
->driver
== &usb_generic_driver
) ||
(dev
->driver_data
== &usb_generic_driver_data
))
return 0;
intf
= to_usb_interface
(dev
);
driver
= to_usb_driver
(dev
->driver
);
if (driver
->resume
)
return driver
->resume
(intf
);
return 0;
}
struct bus_type usb_bus_type
= {
.
name = "usb",
.
match = usb_device_match
,
.
hotplug = usb_hotplug
,
.
suspend = usb_device_suspend
,
.
resume = usb_device_resume
,
};
#ifndef MODULE
static int __init usb_setup_disable
(char *str
)
{
nousb
= 1;
return 1;
}
/* format to disable USB on kernel command line is: nousb */
__setup
("nousb", usb_setup_disable
);
#endif
/*
* for external read access to <nousb>
*/
int usb_disabled
(void)
{
return nousb
;
}
/*
* Init
*/
/*static*/ int __init usb_init
(void)
{
if (nousb
) {
info
("USB support disabled\n");
return 0;
}
bus_register
(&usb_bus_type
);
usb_host_init
();
usb_major_init
();
usbfs_init
();
usb_hub_init
();
driver_register
(&usb_generic_driver
);
return 0;
}
/*
* Cleanup
*/
/*static*/ void __exit usb_exit
(void)
{
/* This will matter if shutdown/reboot does exitcalls. */
if (nousb
)
return;
driver_unregister
(&usb_generic_driver
);
// usb_major_cleanup();
// usbfs_cleanup();
// usb_hub_cleanup();
// usb_host_cleanup();
// bus_unregister(&usb_bus_type);
}
subsys_initcall
(usb_init
);
module_exit
(usb_exit
);
/*
* USB may be built into the kernel or be built as modules.
* These symbols are exported for device (or host controller)
* driver modules to use.
*/
EXPORT_SYMBOL
(usb_epnum_to_ep_desc
);
EXPORT_SYMBOL
(usb_register
);
EXPORT_SYMBOL
(usb_deregister
);
EXPORT_SYMBOL
(usb_disabled
);
EXPORT_SYMBOL
(usb_alloc_dev
);
EXPORT_SYMBOL
(usb_put_dev
);
EXPORT_SYMBOL
(usb_get_dev
);
EXPORT_SYMBOL
(usb_hub_tt_clear_buffer
);
EXPORT_SYMBOL
(usb_driver_claim_interface
);
EXPORT_SYMBOL
(usb_interface_claimed
);
EXPORT_SYMBOL
(usb_driver_release_interface
);
EXPORT_SYMBOL
(usb_match_id
);
EXPORT_SYMBOL
(usb_find_interface
);
EXPORT_SYMBOL
(usb_ifnum_to_if
);
EXPORT_SYMBOL
(usb_reset_device
);
EXPORT_SYMBOL
(usb_disconnect
);
EXPORT_SYMBOL
(__usb_get_extra_descriptor
);
EXPORT_SYMBOL
(usb_find_device
);
EXPORT_SYMBOL
(usb_get_current_frame_number
);
EXPORT_SYMBOL
(usb_buffer_alloc
);
EXPORT_SYMBOL
(usb_buffer_free
);
EXPORT_SYMBOL
(usb_buffer_map
);
EXPORT_SYMBOL
(usb_buffer_dmasync
);
EXPORT_SYMBOL
(usb_buffer_unmap
);
EXPORT_SYMBOL
(usb_buffer_map_sg
);
EXPORT_SYMBOL
(usb_buffer_dmasync_sg
);
EXPORT_SYMBOL
(usb_buffer_unmap_sg
);
MODULE_LICENSE
("GPL");