/*
- * drivers/usb/usb.c
+ * drivers/usb/core/usb.c
*
* (C) Copyright Linus Torvalds 1999
* (C) Copyright Johannes Erdfelt 1999-2001
* are evil.
*/
-#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/spinlock.h>
#include <linux/errno.h>
#include <linux/smp_lock.h>
-#include <linux/rwsem.h>
#include <linux/usb.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
#include <asm/io.h>
#include <asm/scatterlist.h>
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
* 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;
* 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;
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;
*/
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)
{
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;
}
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;
/* 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;
}
/* 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
* 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
* 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)
}
}
- 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;
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)
/* 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;
}
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) {
goto exit;
}
exit:
- up(&usb_bus_list_lock);
+ mutex_unlock(&usb_bus_list_lock);
return dev;
}
*/
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));
}
/*-------------------------------------------------------------------*/
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);
}
/**
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);
}
/**
*
* 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;
* 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;
*
* 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;
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 <nousb>
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;
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;
}
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);
* 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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff