1,1547 → 1,1563 |
/* |
* 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"); |
/* |
* 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; |
|
/* driver claim() doesn't yet affect dev->driver... */ |
if (intf->driver) |
return error; |
|
id = usb_match_id (intf, driver->id_table); |
if (id) { |
dev_dbg (dev, "%s - got id\n", __FUNCTION__); |
error = driver->probe (intf, id); |
} |
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 = intf->driver; |
|
/* release all urbs for this interface */ |
usb_disable_interface(interface_to_usbdev(intf), intf); |
|
if (driver && driver->disconnect) |
driver->disconnect(intf); |
|
/* reset other interface state */ |
usb_set_interface(interface_to_usbdev(intf), |
intf->altsetting[0].desc.bInterfaceNumber, |
0); |
usb_set_intfdata(intf, NULL); |
intf->driver = NULL; |
|
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; |
|
if (iface->driver) |
return -EBUSY; |
|
/* FIXME should device_bind_driver() */ |
iface->driver = driver; |
usb_set_intfdata(iface, priv); |
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 || !iface->driver || iface->driver != driver) |
return; |
|
if (iface->dev.driver) { |
/* FIXME should be the ONLY case here */ |
device_release_driver(&iface->dev); |
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 += snprintf26 (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 += snprintf26 (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 += snprintf26 (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 += snprintf26 (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; |
int config; |
|
|
/* |
* 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. |
* NOTE: should interact with hub power budgeting. |
*/ |
config = dev->config[0].desc.bConfigurationValue; |
if (dev->descriptor.bNumConfigurations != 1) { |
for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { |
/* heuristic: Linux is more likely to have class |
* drivers, so avoid vendor-specific interfaces. |
*/ |
if (dev->config[i].interface[0]->altsetting |
->desc.bInterfaceClass |
== USB_CLASS_VENDOR_SPEC) |
continue; |
config = dev->config[i].desc.bConfigurationValue; |
break; |
} |
dev_info(&dev->dev, |
"configuration #%d chosen from %d choices\n", |
config, |
dev->descriptor.bNumConfigurations); |
} |
err = usb_set_configuration(dev, config); |
|
if (err) { |
dev_err(&dev->dev, "can't set config #%d, error %d\n", |
config, 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"); |