X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fusb%2Fcore%2Fusb.c;h=ab2f68fc7d2d1ab2cf9647ca69e6010ac2b6d087;hb=c4028958b6ecad064b1a6303a6a5906d4fe48d73;hp=2cddd8a00437b8bede3f9814a66dc73a2190886a;hpb=ca078bae813dd46c0f9b102fdfb4a3384641ff48;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 2cddd8a..ab2f68f 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -1,5 +1,5 @@ /* - * drivers/usb/usb.c + * drivers/usb/core/usb.c * * (C) Copyright Linus Torvalds 1999 * (C) Copyright Johannes Erdfelt 1999-2001 @@ -21,14 +21,6 @@ * are evil. */ -#include - -#ifdef CONFIG_USB_DEBUG - #define DEBUG -#else - #undef DEBUG -#endif - #include #include #include @@ -39,8 +31,9 @@ #include #include #include -#include #include +#include +#include #include #include @@ -54,145 +47,9 @@ const char *usbcore_name = "usbcore"; static int nousb; /* Disable USB when built into kernel image */ - /* Not honored on modular build */ - -static DECLARE_RWSEM(usb_all_devices_rwsem); - - -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 = { - .owner = THIS_MODULE, - .name = "usb", - .bus = &usb_bus_type, - .probe = generic_probe, - .remove = generic_remove, -}; - -static int usb_generic_driver_data; - -/* called from driver core with usb_bus_type.subsys writelock */ -static 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; - /* FIXME we'd much prefer to just resume it ... */ - if (interface_to_usbdev(intf)->state == USB_STATE_SUSPENDED) - return -EHOSTUNREACH; - - id = usb_match_id (intf, driver->id_table); - if (id) { - dev_dbg (dev, "%s - got id\n", __FUNCTION__); - intf->condition = USB_INTERFACE_BINDING; - error = driver->probe (intf, id); - intf->condition = error ? USB_INTERFACE_UNBOUND : - USB_INTERFACE_BOUND; - } - return error; -} - -/* called from driver core with usb_bus_type.subsys writelock */ -static int usb_unbind_interface(struct device *dev) -{ - struct usb_interface *intf = to_usb_interface(dev); - struct usb_driver *driver = to_usb_driver(intf->dev.driver); - - intf->condition = USB_INTERFACE_UNBINDING; - - /* release all urbs for this interface */ - usb_disable_interface(interface_to_usbdev(intf), intf); - - if (driver && driver->disconnect) - driver->disconnect(intf); +struct workqueue_struct *ksuspend_usb_wq; /* For autosuspend */ - /* reset other interface state */ - usb_set_interface(interface_to_usbdev(intf), - intf->altsetting[0].desc.bInterfaceNumber, - 0); - usb_set_intfdata(intf, NULL); - intf->condition = USB_INTERFACE_UNBOUND; - - 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; - new_driver->driver.owner = new_driver->owner; - - usb_lock_all_devices(); - retval = driver_register(&new_driver->driver); - usb_unlock_all_devices(); - - if (!retval) { - pr_info("%s: registered new driver %s\n", - usbcore_name, new_driver->name); - usbfs_update_special(); - } else { - printk(KERN_ERR "%s: error %d registering driver %s\n", - usbcore_name, retval, new_driver->name); - } - - return retval; -} - -/** - * usb_deregister - unregister a USB driver - * @driver: USB operations of the driver to unregister - * Context: must be able to sleep - * - * 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) -{ - pr_info("%s: deregistering driver %s\n", usbcore_name, driver->name); - - usb_lock_all_devices(); - driver_unregister (&driver->driver); - usb_unlock_all_devices(); - - usbfs_update_special(); -} /** * usb_ifnum_to_if - get the interface object with a given interface number @@ -213,7 +70,8 @@ void usb_deregister(struct usb_driver *driver) * Don't call this function unless you are bound to one of the interfaces * on this device or you have locked the device! */ -struct usb_interface *usb_ifnum_to_if(struct usb_device *dev, unsigned ifnum) +struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, + unsigned ifnum) { struct usb_host_config *config = dev->actconfig; int i; @@ -246,8 +104,8 @@ struct usb_interface *usb_ifnum_to_if(struct usb_device *dev, unsigned ifnum) * Don't call this function unless you are bound to the intf interface * or you have locked the device! */ -struct usb_host_interface *usb_altnum_to_altsetting(struct usb_interface *intf, - unsigned int altnum) +struct usb_host_interface *usb_altnum_to_altsetting(const struct usb_interface *intf, + unsigned int altnum) { int i; @@ -258,230 +116,23 @@ struct usb_host_interface *usb_altnum_to_altsetting(struct usb_interface *intf, 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; must be in the - * usb device's active configuration - * @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. - * - * Callers must own the device lock and the driver model's usb_bus_type.subsys - * writelock. So driver probe() entries don't need extra locking, - * but other call contexts may need to explicitly claim those locks. - */ -int usb_driver_claim_interface(struct usb_driver *driver, - struct usb_interface *iface, void* priv) -{ - struct device *dev = &iface->dev; - - if (dev->driver) - return -EBUSY; - - dev->driver = &driver->driver; - usb_set_intfdata(iface, priv); - iface->condition = USB_INTERFACE_BOUND; - - /* if interface was already added, bind now; else let - * the future device_add() bind it, bypassing probe() - */ - if (klist_node_attached(&dev->knode_bus)) - device_bind_driver(dev); - - return 0; -} - -/** - * 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 - * - * This can be used by drivers to release an interface without waiting - * for their disconnect() methods to be called. In typical cases this - * also causes the driver disconnect() method to be called. - * - * This call is synchronous, and may not be used in an interrupt context. - * Callers must own the device lock and the driver model's usb_bus_type.subsys - * writelock. So driver disconnect() entries don't need extra locking, - * but other call contexts may need to explicitly claim those locks. - */ -void usb_driver_release_interface(struct usb_driver *driver, - struct usb_interface *iface) -{ - struct device *dev = &iface->dev; - - /* this should never happen, don't release something that's not ours */ - if (!dev->driver || dev->driver != &driver->driver) - return; - - /* don't release from within disconnect() */ - if (iface->condition != USB_INTERFACE_BOUND) - return; - - /* release only after device_add() */ - if (klist_node_attached(&dev->knode_bus)) { - iface->condition = USB_INTERFACE_UNBINDING; - device_release_driver(dev); - } - - dev->driver = NULL; - usb_set_intfdata(iface, NULL); - iface->condition = USB_INTERFACE_UNBOUND; -} - -/** - * 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->cur_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 != le16_to_cpu(dev->descriptor.idVendor)) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && - id->idProduct != le16_to_cpu(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 > le16_to_cpu(dev->descriptor.bcdDevice))) - continue; - - if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && - (id->bcdDevice_hi < le16_to_cpu(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; -} - +struct find_interface_arg { + int minor; + struct usb_interface *interface; +}; static int __find_interface(struct device * dev, void * data) { - struct usb_interface ** ret = (struct usb_interface **)data; - struct usb_interface * intf = *ret; - int *minor = (int *)data; + struct find_interface_arg *arg = data; + struct usb_interface *intf; /* can't look at usb devices, only interfaces */ - if (dev->driver == &usb_generic_driver) + if (is_usb_device(dev)) return 0; intf = to_usb_interface(dev); - if (intf->minor != -1 && intf->minor == *minor) { - *ret = intf; + if (intf->minor != -1 && intf->minor == arg->minor) { + arg->interface = intf; return 1; } return 0; @@ -498,189 +149,84 @@ static int __find_interface(struct device * dev, void * data) */ struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) { - struct usb_interface *intf = (struct usb_interface *)(long)minor; - int ret; - - ret = driver_for_each_device(&drv->driver, NULL, &intf, __find_interface); + struct find_interface_arg argb; + int retval; - return ret ? intf : NULL; + argb.minor = minor; + argb.interface = NULL; + /* eat the error, it will be in argb.interface */ + retval = driver_for_each_device(&drv->drvwrap.driver, NULL, &argb, + __find_interface); + return argb.interface; } -static int usb_device_match (struct device *dev, struct device_driver *drv) +/** + * 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_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; + struct usb_device *udev; - intf = to_usb_interface(dev); - usb_drv = to_usb_driver(drv); - - id = usb_match_id (intf, usb_drv->id_table); - if (id) - return 1; + udev = to_usb_device(dev); - return 0; +#ifdef CONFIG_USB_SUSPEND + cancel_delayed_work(&udev->autosuspend); + flush_workqueue(ksuspend_usb_wq); +#endif + usb_destroy_configuration(udev); + usb_put_hcd(bus_to_hcd(udev->bus)); + kfree(udev->product); + kfree(udev->manufacturer); + kfree(udev->serial); + kfree(udev); } +#ifdef CONFIG_PM -#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) +static int ksuspend_usb_init(void) { - struct usb_interface *intf; - struct usb_device *usb_dev; - int i = 0; - int length = 0; - - if (!dev) - return -ENODEV; + ksuspend_usb_wq = create_singlethread_workqueue("ksuspend_usbd"); + if (!ksuspend_usb_wq) + return -ENOMEM; + return 0; +} - /* driver is often null here; dev_dbg() would oops */ - pr_debug ("usb %s: hotplug\n", dev->bus_id); +static void ksuspend_usb_cleanup(void) +{ + destroy_workqueue(ksuspend_usb_wq); +} - /* 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; +#else - intf = to_usb_interface(dev); - usb_dev = interface_to_usbdev (intf); - - if (usb_dev->devnum < 0) { - pr_debug ("usb %s: already deleted?\n", dev->bus_id); - return -ENODEV; - } - if (!usb_dev->bus) { - pr_debug ("usb %s: bus removed?\n", dev->bus_id); - return -ENODEV; - } +#define ksuspend_usb_init() 0 +#define ksuspend_usb_cleanup() do {} while (0) -#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 - */ - if (add_hotplug_env_var(envp, num_envp, &i, - buffer, buffer_size, &length, - "DEVICE=/proc/bus/usb/%03d/%03d", - usb_dev->bus->busnum, usb_dev->devnum)) - return -ENOMEM; #endif - /* per-device configurations are common */ - if (add_hotplug_env_var(envp, num_envp, &i, - buffer, buffer_size, &length, - "PRODUCT=%x/%x/%x", - le16_to_cpu(usb_dev->descriptor.idVendor), - le16_to_cpu(usb_dev->descriptor.idProduct), - le16_to_cpu(usb_dev->descriptor.bcdDevice))) - return -ENOMEM; - - /* class-based driver binding models */ - if (add_hotplug_env_var(envp, num_envp, &i, - buffer, buffer_size, &length, - "TYPE=%d/%d/%d", - usb_dev->descriptor.bDeviceClass, - usb_dev->descriptor.bDeviceSubClass, - usb_dev->descriptor.bDeviceProtocol)) - return -ENOMEM; - - if (usb_dev->descriptor.bDeviceClass == 0) { - struct usb_host_interface *alt = intf->cur_altsetting; - - /* 2.4 only exposed interface zero. in 2.5, hotplug - * agents are called for all interfaces, and can use - * $DEVPATH/bInterfaceNumber if necessary. - */ - if (add_hotplug_env_var(envp, num_envp, &i, - buffer, buffer_size, &length, - "INTERFACE=%d/%d/%d", - alt->desc.bInterfaceClass, - alt->desc.bInterfaceSubClass, - alt->desc.bInterfaceProtocol)) - return -ENOMEM; - - if (add_hotplug_env_var(envp, num_envp, &i, - buffer, buffer_size, &length, - "MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X", - le16_to_cpu(usb_dev->descriptor.idVendor), - le16_to_cpu(usb_dev->descriptor.idProduct), - le16_to_cpu(usb_dev->descriptor.bcdDevice), - usb_dev->descriptor.bDeviceClass, - usb_dev->descriptor.bDeviceSubClass, - usb_dev->descriptor.bDeviceProtocol, - alt->desc.bInterfaceClass, - alt->desc.bInterfaceSubClass, - alt->desc.bInterfaceProtocol)) - return -ENOMEM; - } else { - if (add_hotplug_env_var(envp, num_envp, &i, - buffer, buffer_size, &length, - "MODALIAS=usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic*isc*ip*", - le16_to_cpu(usb_dev->descriptor.idVendor), - le16_to_cpu(usb_dev->descriptor.idProduct), - le16_to_cpu(usb_dev->descriptor.bcdDevice), - usb_dev->descriptor.bDeviceClass, - usb_dev->descriptor.bDeviceSubClass, - usb_dev->descriptor.bDeviceProtocol)) - return -ENOMEM; - } +#ifdef CONFIG_USB_SUSPEND - envp[i] = NULL; +/* usb_autosuspend_work - callback routine to autosuspend a USB device */ +static void usb_autosuspend_work(struct work_struct *work) +{ + struct usb_device *udev = + container_of(work, struct usb_device, autosuspend.work); - return 0; + usb_pm_lock(udev); + udev->auto_pm = 1; + usb_suspend_both(udev, PMSG_SUSPEND); + usb_pm_unlock(udev); } #else -static int usb_hotplug (struct device *dev, char **envp, - int num_envp, char *buffer, int buffer_size) -{ - return -ENODEV; -} - -#endif /* CONFIG_HOTPLUG */ +static void usb_autosuspend_work(struct work_struct *work) +{} -/** - * 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); - - usb_destroy_configuration(udev); - usb_bus_put(udev->bus); - kfree(udev->product); - kfree(udev->manufacturer); - kfree(udev->serial); - kfree(udev); -} +#endif /** * usb_alloc_dev - usb device constructor (usbcore-internal) @@ -699,14 +245,11 @@ usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1) { struct usb_device *dev; - dev = kmalloc(sizeof(*dev), GFP_KERNEL); + dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return NULL; - memset(dev, 0, sizeof(*dev)); - - bus = usb_bus_get(bus); - if (!bus) { + if (!usb_get_hcd(bus_to_hcd(bus))) { kfree(dev); return NULL; } @@ -714,11 +257,12 @@ usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1) device_initialize(&dev->dev); dev->dev.bus = &usb_bus_type; dev->dev.dma_mask = bus->controller->dma_mask; - dev->dev.driver_data = &usb_generic_driver_data; - dev->dev.driver = &usb_generic_driver; dev->dev.release = usb_release_dev; dev->state = USB_STATE_ATTACHED; + /* This magic assignment distinguishes devices from interfaces */ + dev->dev.platform_data = &usb_generic_driver; + INIT_LIST_HEAD(&dev->ep0.urb_list); dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; @@ -754,12 +298,15 @@ usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1) /* hub driver sets up TT records */ } + dev->portnum = port1; dev->bus = bus; dev->parent = parent; INIT_LIST_HEAD(&dev->filelist); - init_MUTEX(&dev->serialize); - +#ifdef CONFIG_PM + mutex_init(&dev->pm_mutex); + INIT_DELAYED_WORK(&dev->autosuspend, usb_autosuspend_work); +#endif return dev; } @@ -832,76 +379,21 @@ void usb_put_intf(struct usb_interface *intf) /* USB device locking * - * Although locking USB devices should be straightforward, it is - * complicated by the way the driver-model core works. When a new USB - * driver is registered or unregistered, the core will automatically - * probe or disconnect all matching interfaces on all USB devices while - * holding the USB subsystem writelock. There's no good way for us to - * tell which devices will be used or to lock them beforehand; our only - * option is to effectively lock all the USB devices. - * - * We do that by using a private rw-semaphore, usb_all_devices_rwsem. - * When locking an individual device you must first acquire the rwsem's - * readlock. When a driver is registered or unregistered the writelock - * must be held. These actions are encapsulated in the subroutines - * below, so all a driver needs to do is call usb_lock_device() and - * usb_unlock_device(). + * USB devices and interfaces are locked using the semaphore in their + * embedded struct device. The hub driver guarantees that whenever a + * device is connected or disconnected, drivers are called with the + * USB device locked as well as their particular interface. * * Complications arise when several devices are to be locked at the same * time. Only hub-aware drivers that are part of usbcore ever have to - * do this; nobody else needs to worry about it. The problem is that - * usb_lock_device() must not be called to lock a second device since it - * would acquire the rwsem's readlock reentrantly, leading to deadlock if - * another thread was waiting for the writelock. The solution is simple: - * - * When locking more than one device, call usb_lock_device() - * to lock the first one. Lock the others by calling - * down(&udev->serialize) directly. - * - * When unlocking multiple devices, use up(&udev->serialize) - * to unlock all but the last one. Unlock the last one by - * calling usb_unlock_device(). + * do this; nobody else needs to worry about it. The rule for locking + * is simple: * * When locking both a device and its parent, always lock the * the parent first. */ /** - * usb_lock_device - acquire the lock for a usb device structure - * @udev: device that's being locked - * - * Use this routine when you don't hold any other device locks; - * to acquire nested inner locks call down(&udev->serialize) directly. - * This is necessary for proper interaction with usb_lock_all_devices(). - */ -void usb_lock_device(struct usb_device *udev) -{ - down_read(&usb_all_devices_rwsem); - down(&udev->serialize); -} - -/** - * usb_trylock_device - attempt to acquire the lock for a usb device structure - * @udev: device that's being locked - * - * Don't use this routine if you already hold a device lock; - * use down_trylock(&udev->serialize) instead. - * This is necessary for proper interaction with usb_lock_all_devices(). - * - * Returns 1 if successful, 0 if contention. - */ -int usb_trylock_device(struct usb_device *udev) -{ - if (!down_read_trylock(&usb_all_devices_rwsem)) - return 0; - if (down_trylock(&udev->serialize)) { - up_read(&usb_all_devices_rwsem); - return 0; - } - return 1; -} - -/** * usb_lock_device_for_reset - cautiously acquire the lock for a * usb device structure * @udev: device that's being locked @@ -912,7 +404,7 @@ int usb_trylock_device(struct usb_device *udev) * is neither BINDING nor BOUND. Rather than sleeping to wait for the * lock, the routine polls repeatedly. This is to prevent deadlock with * disconnect; in some drivers (such as usb-storage) the disconnect() - * callback will block waiting for a device reset to complete. + * or suspend() method will block waiting for a device reset to complete. * * Returns a negative error code for failure, otherwise 1 or 0 to indicate * that the device will or will not have to be unlocked. (0 can be @@ -920,8 +412,10 @@ int usb_trylock_device(struct usb_device *udev) * case the driver already owns the device lock.) */ int usb_lock_device_for_reset(struct usb_device *udev, - struct usb_interface *iface) + const struct usb_interface *iface) { + unsigned long jiffies_expire = jiffies + HZ; + if (udev->state == USB_STATE_NOTATTACHED) return -ENODEV; if (udev->state == USB_STATE_SUSPENDED) @@ -937,7 +431,13 @@ int usb_lock_device_for_reset(struct usb_device *udev, } } - while (!usb_trylock_device(udev)) { + while (usb_trylock_device(udev) != 0) { + + /* If we can't acquire the lock after waiting one second, + * we're probably deadlocked */ + if (time_after(jiffies, jiffies_expire)) + return -EBUSY; + msleep(15); if (udev->state == USB_STATE_NOTATTACHED) return -ENODEV; @@ -949,39 +449,6 @@ int usb_lock_device_for_reset(struct usb_device *udev, return 1; } -/** - * usb_unlock_device - release the lock for a usb device structure - * @udev: device that's being unlocked - * - * Use this routine when releasing the only device lock you hold; - * to release inner nested locks call up(&udev->serialize) directly. - * This is necessary for proper interaction with usb_lock_all_devices(). - */ -void usb_unlock_device(struct usb_device *udev) -{ - up(&udev->serialize); - up_read(&usb_all_devices_rwsem); -} - -/** - * usb_lock_all_devices - acquire the lock for all usb device structures - * - * This is necessary when registering a new driver or probing a bus, - * since the driver-model core may try to use any usb_device. - */ -void usb_lock_all_devices(void) -{ - down_write(&usb_all_devices_rwsem); -} - -/** - * usb_unlock_all_devices - release the lock for all usb device structures - */ -void usb_unlock_all_devices(void) -{ - up_write(&usb_all_devices_rwsem); -} - static struct usb_device *match_device(struct usb_device *dev, u16 vendor_id, u16 product_id) @@ -1004,10 +471,10 @@ static struct usb_device *match_device(struct usb_device *dev, /* look through all of the children of this device */ for (child = 0; child < dev->maxchild; ++child) { if (dev->children[child]) { - down(&dev->children[child]->serialize); + usb_lock_device(dev->children[child]); ret_dev = match_device(dev->children[child], vendor_id, product_id); - up(&dev->children[child]->serialize); + usb_unlock_device(dev->children[child]); if (ret_dev) goto exit; } @@ -1035,7 +502,7 @@ struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) struct usb_bus *bus; struct usb_device *dev = NULL; - down(&usb_bus_list_lock); + mutex_lock(&usb_bus_list_lock); for (buslist = usb_bus_list.next; buslist != &usb_bus_list; buslist = buslist->next) { @@ -1049,7 +516,7 @@ struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) goto exit; } exit: - up(&usb_bus_list_lock); + mutex_unlock(&usb_bus_list_lock); return dev; } @@ -1068,7 +535,139 @@ exit: */ int usb_get_current_frame_number(struct usb_device *dev) { - return dev->bus->op->get_frame_number (dev); + return usb_hcd_get_frame_number (dev); +} + +/** + * usb_endpoint_dir_in - check if the endpoint has IN direction + * @epd: endpoint to be checked + * + * Returns true if the endpoint is of type IN, otherwise it returns false. + */ +int usb_endpoint_dir_in(const struct usb_endpoint_descriptor *epd) +{ + return ((epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN); +} + +/** + * usb_endpoint_dir_out - check if the endpoint has OUT direction + * @epd: endpoint to be checked + * + * Returns true if the endpoint is of type OUT, otherwise it returns false. + */ +int usb_endpoint_dir_out(const struct usb_endpoint_descriptor *epd) +{ + return ((epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT); +} + +/** + * usb_endpoint_xfer_bulk - check if the endpoint has bulk transfer type + * @epd: endpoint to be checked + * + * Returns true if the endpoint is of type bulk, otherwise it returns false. + */ +int usb_endpoint_xfer_bulk(const struct usb_endpoint_descriptor *epd) +{ + return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == + USB_ENDPOINT_XFER_BULK); +} + +/** + * usb_endpoint_xfer_int - check if the endpoint has interrupt transfer type + * @epd: endpoint to be checked + * + * Returns true if the endpoint is of type interrupt, otherwise it returns + * false. + */ +int usb_endpoint_xfer_int(const struct usb_endpoint_descriptor *epd) +{ + return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == + USB_ENDPOINT_XFER_INT); +} + +/** + * usb_endpoint_xfer_isoc - check if the endpoint has isochronous transfer type + * @epd: endpoint to be checked + * + * Returns true if the endpoint is of type isochronous, otherwise it returns + * false. + */ +int usb_endpoint_xfer_isoc(const struct usb_endpoint_descriptor *epd) +{ + return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == + USB_ENDPOINT_XFER_ISOC); +} + +/** + * usb_endpoint_is_bulk_in - check if the endpoint is bulk IN + * @epd: endpoint to be checked + * + * Returns true if the endpoint has bulk transfer type and IN direction, + * otherwise it returns false. + */ +int usb_endpoint_is_bulk_in(const struct usb_endpoint_descriptor *epd) +{ + return (usb_endpoint_xfer_bulk(epd) && usb_endpoint_dir_in(epd)); +} + +/** + * usb_endpoint_is_bulk_out - check if the endpoint is bulk OUT + * @epd: endpoint to be checked + * + * Returns true if the endpoint has bulk transfer type and OUT direction, + * otherwise it returns false. + */ +int usb_endpoint_is_bulk_out(const struct usb_endpoint_descriptor *epd) +{ + return (usb_endpoint_xfer_bulk(epd) && usb_endpoint_dir_out(epd)); +} + +/** + * usb_endpoint_is_int_in - check if the endpoint is interrupt IN + * @epd: endpoint to be checked + * + * Returns true if the endpoint has interrupt transfer type and IN direction, + * otherwise it returns false. + */ +int usb_endpoint_is_int_in(const struct usb_endpoint_descriptor *epd) +{ + return (usb_endpoint_xfer_int(epd) && usb_endpoint_dir_in(epd)); +} + +/** + * usb_endpoint_is_int_out - check if the endpoint is interrupt OUT + * @epd: endpoint to be checked + * + * Returns true if the endpoint has interrupt transfer type and OUT direction, + * otherwise it returns false. + */ +int usb_endpoint_is_int_out(const struct usb_endpoint_descriptor *epd) +{ + return (usb_endpoint_xfer_int(epd) && usb_endpoint_dir_out(epd)); +} + +/** + * usb_endpoint_is_isoc_in - check if the endpoint is isochronous IN + * @epd: endpoint to be checked + * + * Returns true if the endpoint has isochronous transfer type and IN direction, + * otherwise it returns false. + */ +int usb_endpoint_is_isoc_in(const struct usb_endpoint_descriptor *epd) +{ + return (usb_endpoint_xfer_isoc(epd) && usb_endpoint_dir_in(epd)); +} + +/** + * usb_endpoint_is_isoc_out - check if the endpoint is isochronous OUT + * @epd: endpoint to be checked + * + * Returns true if the endpoint has isochronous transfer type and OUT direction, + * otherwise it returns false. + */ +int usb_endpoint_is_isoc_out(const struct usb_endpoint_descriptor *epd) +{ + return (usb_endpoint_xfer_isoc(epd) && usb_endpoint_dir_out(epd)); } /*-------------------------------------------------------------------*/ @@ -1129,13 +728,13 @@ int __usb_get_extra_descriptor(char *buffer, unsigned size, void *usb_buffer_alloc ( struct usb_device *dev, size_t size, - unsigned mem_flags, + gfp_t mem_flags, dma_addr_t *dma ) { - if (!dev || !dev->bus || !dev->bus->op || !dev->bus->op->buffer_alloc) + if (!dev || !dev->bus) return NULL; - return dev->bus->op->buffer_alloc (dev->bus, size, mem_flags, dma); + return hcd_buffer_alloc (dev->bus, size, mem_flags, dma); } /** @@ -1156,9 +755,11 @@ void usb_buffer_free ( 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); + if (!dev || !dev->bus) + return; + if (!addr) + return; + hcd_buffer_free (dev->bus, size, addr, dma); } /** @@ -1307,8 +908,8 @@ void usb_buffer_unmap (struct urb *urb) * * 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) +int usb_buffer_map_sg(const struct usb_device *dev, unsigned pipe, + struct scatterlist *sg, int nents) { struct usb_bus *bus; struct device *controller; @@ -1342,8 +943,8 @@ int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe, * 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) +void usb_buffer_dmasync_sg(const struct usb_device *dev, unsigned pipe, + struct scatterlist *sg, int n_hw_ents) { struct usb_bus *bus; struct device *controller; @@ -1368,8 +969,8 @@ void usb_buffer_dmasync_sg (struct usb_device *dev, unsigned pipe, * * 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) +void usb_buffer_unmap_sg(const struct usb_device *dev, unsigned pipe, + struct scatterlist *sg, int n_hw_ents) { struct usb_bus *bus; struct device *controller; @@ -1384,71 +985,8 @@ void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe, usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); } -static int usb_generic_suspend(struct device *dev, pm_message_t message) -{ - struct usb_interface *intf; - struct usb_driver *driver; - - if (dev->driver == &usb_generic_driver) - return usb_suspend_device (to_usb_device(dev), message); - - if ((dev->driver == NULL) || - (dev->driver_data == &usb_generic_driver_data)) - return 0; - - intf = to_usb_interface(dev); - driver = to_usb_driver(dev->driver); - - /* there's only one USB suspend state */ - if (intf->dev.power.power_state.event) - return 0; - - if (driver->suspend) - return driver->suspend(intf, message); - return 0; -} - -static int usb_generic_resume(struct device *dev) -{ - struct usb_interface *intf; - struct usb_driver *driver; - - /* devices resume through their hub */ - if (dev->driver == &usb_generic_driver) - return usb_resume_device (to_usb_device(dev)); - - if ((dev->driver == NULL) || - (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_generic_suspend, - .resume = usb_generic_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 +__module_param_call("", nousb, param_set_bool, param_get_bool, &nousb, 0444); /* * for external read access to @@ -1469,23 +1007,31 @@ static int __init usb_init(void) return 0; } + retval = ksuspend_usb_init(); + if (retval) + goto out; retval = bus_register(&usb_bus_type); if (retval) - goto out; + goto bus_register_failed; retval = usb_host_init(); if (retval) goto host_init_failed; retval = usb_major_init(); if (retval) goto major_init_failed; + retval = usb_register(&usbfs_driver); + if (retval) + goto driver_register_failed; + retval = usbdev_init(); + if (retval) + goto usbdevice_init_failed; retval = usbfs_init(); if (retval) goto fs_init_failed; retval = usb_hub_init(); if (retval) goto hub_init_failed; - - retval = driver_register(&usb_generic_driver); + retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); if (!retval) goto out; @@ -1493,11 +1039,17 @@ static int __init usb_init(void) hub_init_failed: usbfs_cleanup(); fs_init_failed: - usb_major_cleanup(); + usbdev_cleanup(); +usbdevice_init_failed: + usb_deregister(&usbfs_driver); +driver_register_failed: + usb_major_cleanup(); major_init_failed: usb_host_cleanup(); host_init_failed: bus_unregister(&usb_bus_type); +bus_register_failed: + ksuspend_usb_cleanup(); out: return retval; } @@ -1511,12 +1063,15 @@ static void __exit usb_exit(void) if (nousb) return; - driver_unregister(&usb_generic_driver); + usb_deregister_device_driver(&usb_generic_driver); usb_major_cleanup(); usbfs_cleanup(); + usb_deregister(&usbfs_driver); + usbdev_cleanup(); usb_hub_cleanup(); usb_host_cleanup(); bus_unregister(&usb_bus_type); + ksuspend_usb_cleanup(); } subsys_initcall(usb_init); @@ -1528,38 +1083,38 @@ module_exit(usb_exit); * driver modules to use. */ -EXPORT_SYMBOL(usb_register); -EXPORT_SYMBOL(usb_deregister); EXPORT_SYMBOL(usb_disabled); EXPORT_SYMBOL_GPL(usb_get_intf); EXPORT_SYMBOL_GPL(usb_put_intf); -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_lock_device); -EXPORT_SYMBOL(usb_trylock_device); EXPORT_SYMBOL(usb_lock_device_for_reset); -EXPORT_SYMBOL(usb_unlock_device); -EXPORT_SYMBOL(usb_driver_claim_interface); -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_altnum_to_altsetting); -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_GPL(usb_endpoint_dir_in); +EXPORT_SYMBOL_GPL(usb_endpoint_dir_out); +EXPORT_SYMBOL_GPL(usb_endpoint_xfer_bulk); +EXPORT_SYMBOL_GPL(usb_endpoint_xfer_int); +EXPORT_SYMBOL_GPL(usb_endpoint_xfer_isoc); +EXPORT_SYMBOL_GPL(usb_endpoint_is_bulk_in); +EXPORT_SYMBOL_GPL(usb_endpoint_is_bulk_out); +EXPORT_SYMBOL_GPL(usb_endpoint_is_int_in); +EXPORT_SYMBOL_GPL(usb_endpoint_is_int_out); +EXPORT_SYMBOL_GPL(usb_endpoint_is_isoc_in); +EXPORT_SYMBOL_GPL(usb_endpoint_is_isoc_out); + EXPORT_SYMBOL (usb_buffer_alloc); EXPORT_SYMBOL (usb_buffer_free);