/* * drivers/usb/core/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 2000-2004 * (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 <linux/module.h>#include <linux/moduleparam.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/usb.h>#include <linux/usb/hcd.h>#include <linux/mutex.h>#include <linux/workqueue.h>#include <linux/debugfs.h> #include <asm/io.h>#include <linux/scatterlist.h>#include <linux/mm.h>#include <linux/dma-mapping.h> #include "usb.h" const char *usbcore_name = "usbcore"; static bool nousb; /* Disable USB when built into kernel image */ #ifdef CONFIG_USB_SUSPENDstatic int usb_autosuspend_delay = 2; /* Default delay value, * in seconds */module_param_named(autosuspend, usb_autosuspend_delay, int, 0644);MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); #else#define usb_autosuspend_delay 0#endif /** * usb_find_alt_setting() - Given a configuration, find the alternate setting * for the given interface. * @config: the configuration to search (not necessarily the current config). * @iface_num: interface number to search in * @alt_num: alternate interface setting number to search for. * * Search the configuration's interface cache for the given alt setting. */struct usb_host_interface *usb_find_alt_setting( struct usb_host_config *config, unsigned int iface_num, unsigned int alt_num){ struct usb_interface_cache *intf_cache = NULL; int i; for (i = 0; i < config->desc.bNumInterfaces; i++) { if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber == iface_num) { intf_cache = config->intf_cache[i]; break; } } if (!intf_cache) return NULL; for (i = 0; i < intf_cache->num_altsetting; i++) if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num) return &intf_cache->altsetting[i]; printk(KERN_DEBUG "Did not find alt setting %u for intf %u, " "config %u\n", alt_num, iface_num, config->desc.bConfigurationValue); return NULL;}EXPORT_SYMBOL_GPL(usb_find_alt_setting); /** * usb_ifnum_to_if - get the interface object with a given interface number * @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. * * 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(const struct usb_device *dev, unsigned ifnum){ struct usb_host_config *config = dev->actconfig; int i; if (!config) return NULL; for (i = 0; i < config->desc.bNumInterfaces; i++) if (config->interface[i]->altsetting[0] .desc.bInterfaceNumber == ifnum) return config->interface[i]; return NULL;}EXPORT_SYMBOL_GPL(usb_ifnum_to_if); /** * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number. * @intf: the interface containing the altsetting in question * @altnum: the desired alternate setting number * * This searches the altsetting array of the specified interface for * an entry with the correct bAlternateSetting value and returns a pointer * to that entry, or null. * * Note that altsettings need not be stored sequentially by number, so * it would be incorrect to assume that the first altsetting entry in * the array corresponds to altsetting zero. This routine helps device * drivers avoid such mistakes. * * 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( const struct usb_interface *intf, unsigned int altnum){ int i; for (i = 0; i < intf->num_altsetting; i++) { if (intf->altsetting[i].desc.bAlternateSetting == altnum) return &intf->altsetting[i]; } return NULL;}EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); struct find_interface_arg { int minor; struct device_driver *drv;}; static int __find_interface(struct device *dev, void *data){ struct find_interface_arg *arg = data; struct usb_interface *intf; if (!is_usb_interface(dev)) return 0; if (dev->driver != arg->drv) return 0; intf = to_usb_interface(dev); return intf->minor == arg->minor;} /** * 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 bus device list and returns a pointer to the interface * with the matching minor and driver. 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 find_interface_arg argb; struct device *dev; argb.minor = minor; argb.drv = &drv->drvwrap.driver; dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface); /* Drop reference count from bus_find_device */ put_device(dev); return dev ? to_usb_interface(dev) : NULL;}EXPORT_SYMBOL_GPL(usb_find_interface); /** * 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; struct usb_hcd *hcd; udev = to_usb_device(dev); hcd = bus_to_hcd(udev->bus); usb_destroy_configuration(udev); usb_release_bos_descriptor(udev); usb_put_hcd(hcd); kfree(udev->product); kfree(udev->manufacturer); kfree(udev->serial); kfree(udev);} #ifdef CONFIG_HOTPLUGstatic int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env){ struct usb_device *usb_dev; usb_dev = to_usb_device(dev); if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum)) return -ENOMEM; if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum)) return -ENOMEM; return 0;} #else static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env){ return -ENODEV;}#endif /* CONFIG_HOTPLUG */ #ifdef CONFIG_PM /* USB device Power-Management thunks. * There's no need to distinguish here between quiescing a USB device * and powering it down; the generic_suspend() routine takes care of * it by skipping the usb_port_suspend() call for a quiesce. And for * USB interfaces there's no difference at all. */ static int usb_dev_prepare(struct device *dev){ return 0; /* Implement eventually? */} static void usb_dev_complete(struct device *dev){ /* Currently used only for rebinding interfaces */ usb_resume_complete(dev);} static int usb_dev_suspend(struct device *dev){ return usb_suspend(dev, PMSG_SUSPEND);} static int usb_dev_resume(struct device *dev){ return usb_resume(dev, PMSG_RESUME);} static int usb_dev_freeze(struct device *dev){ return usb_suspend(dev, PMSG_FREEZE);} static int usb_dev_thaw(struct device *dev){ return usb_resume(dev, PMSG_THAW);} static int usb_dev_poweroff(struct device *dev){ return usb_suspend(dev, PMSG_HIBERNATE);} static int usb_dev_restore(struct device *dev){ return usb_resume(dev, PMSG_RESTORE);} static const struct dev_pm_ops usb_device_pm_ops = { .prepare = usb_dev_prepare, .complete = usb_dev_complete, .suspend = usb_dev_suspend, .resume = usb_dev_resume, .freeze = usb_dev_freeze, .thaw = usb_dev_thaw, .poweroff = usb_dev_poweroff, .restore = usb_dev_restore,#ifdef CONFIG_USB_SUSPEND .runtime_suspend = usb_runtime_suspend, .runtime_resume = usb_runtime_resume, .runtime_idle = usb_runtime_idle,#endif}; #endif /* CONFIG_PM */ static char *usb_devnode(struct device *dev, umode_t *mode){ struct usb_device *usb_dev; usb_dev = to_usb_device(dev); return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d", usb_dev->bus->busnum, usb_dev->devnum);} struct device_type usb_device_type = { .name = "usb_device", .release = usb_release_dev, .uevent = usb_dev_uevent, .devnode = usb_devnode,#ifdef CONFIG_PM .pm = &usb_device_pm_ops,#endif}; /* Returns 1 if @usb_bus is WUSB, 0 otherwise */static unsigned usb_bus_is_wusb(struct usb_bus *bus){ struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self); return hcd->wireless;} /** * usb_alloc_dev - usb device constructor (usbcore-internal) * @parent: hub to which device is connected; null to allocate a root hub * @bus: bus used to access the device * @port1: one-based index of port; ignored for root hubs * Context: !in_interrupt() * * Only hub drivers (including virtual root hub drivers for host * controllers) should ever call this. * * This call may not be used in a non-sleeping context. */struct usb_device *usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1){ struct usb_device *dev; struct usb_hcd *usb_hcd = container_of(bus, struct usb_hcd, self); unsigned root_hub = 0; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return NULL; if (!usb_get_hcd(bus_to_hcd(bus))) { kfree(dev); return NULL; } /* Root hubs aren't true devices, so don't allocate HCD resources */ if (usb_hcd->driver->alloc_dev && parent && !usb_hcd->driver->alloc_dev(usb_hcd, dev)) { usb_put_hcd(bus_to_hcd(bus)); kfree(dev); return NULL; } device_initialize(&dev->dev); dev->dev.bus = &usb_bus_type; dev->dev.type = &usb_device_type; dev->dev.groups = usb_device_groups; dev->dev.dma_mask = bus->controller->dma_mask; set_dev_node(&dev->dev, dev_to_node(bus->controller)); dev->state = USB_STATE_ATTACHED; atomic_set(&dev->urbnum, 0); INIT_LIST_HEAD(&dev->ep0.urb_list); dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; /* ep0 maxpacket comes later, from device descriptor */ usb_enable_endpoint(dev, &dev->ep0, false); dev->can_submit = 1; /* Save readable and stable topology id, distinguishing devices * by location for diagnostics, tools, driver model, etc. The * string is a path along hub ports, from the root. Each device's * dev->devpath will be stable until USB is re-cabled, and hubs * are often labeled with these port numbers. The name isn't * as stable: bus->busnum changes easily from modprobe order, * cardbus or pci hotplugging, and so on. */ if (unlikely(!parent)) { dev->devpath[0] = '0'; dev->route = 0; dev->dev.parent = bus->controller; dev_set_name(&dev->dev, "usb%d", bus->busnum); root_hub = 1; } else { /* match any labeling on the hubs; it's one-based */ if (parent->devpath[0] == '0') { snprintf(dev->devpath, sizeof dev->devpath, "%d", port1); /* Root ports are not counted in route string */ dev->route = 0; } else { snprintf(dev->devpath, sizeof dev->devpath, "%s.%d", parent->devpath, port1); /* Route string assumes hubs have less than 16 ports */ if (port1 < 15) dev->route = parent->route + (port1 << ((parent->level - 1)*4)); else dev->route = parent->route + (15 << ((parent->level - 1)*4)); } dev->dev.parent = &parent->dev; dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); /* hub driver sets up TT records */ } dev->portnum = port1; dev->bus = bus; dev->parent = parent; INIT_LIST_HEAD(&dev->filelist); #ifdef CONFIG_PM pm_runtime_set_autosuspend_delay(&dev->dev, usb_autosuspend_delay * 1000); dev->connect_time = jiffies; dev->active_duration = -jiffies;#endif if (root_hub) /* Root hub always ok [and always wired] */ dev->authorized = 1; else { dev->authorized = usb_hcd->authorized_default; dev->wusb = usb_bus_is_wusb(bus)? 1 : 0; } 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){ if (dev) get_device(&dev->dev); return dev;}EXPORT_SYMBOL_GPL(usb_get_dev); /** * 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);}EXPORT_SYMBOL_GPL(usb_put_dev);Lines 1–500 of 1081. Load more
/* * drivers/usb/core/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 2000-2004 * (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 <linux/module.h> #include <linux/moduleparam.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/usb.h> #include <linux/usb/hcd.h> #include <linux/mutex.h> #include <linux/workqueue.h> #include <linux/debugfs.h> #include <asm/io.h> #include <linux/scatterlist.h> #include <linux/mm.h> #include <linux/dma-mapping.h> #include "usb.h" const char *usbcore_name = "usbcore"; static bool nousb; /* Disable USB when built into kernel image */ #ifdef CONFIG_USB_SUSPEND static int usb_autosuspend_delay = 2; /* Default delay value, * in seconds */ module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); #else #define usb_autosuspend_delay 0 #endif /** * usb_find_alt_setting() - Given a configuration, find the alternate setting * for the given interface. * @config: the configuration to search (not necessarily the current config). * @iface_num: interface number to search in * @alt_num: alternate interface setting number to search for. * * Search the configuration's interface cache for the given alt setting. */ struct usb_host_interface *usb_find_alt_setting( struct usb_host_config *config, unsigned int iface_num, unsigned int alt_num) { struct usb_interface_cache *intf_cache = NULL; int i; for (i = 0; i < config->desc.bNumInterfaces; i++) { if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber == iface_num) { intf_cache = config->intf_cache[i]; break; } } if (!intf_cache) return NULL; for (i = 0; i < intf_cache->num_altsetting; i++) if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num) return &intf_cache->altsetting[i]; printk(KERN_DEBUG "Did not find alt setting %u for intf %u, " "config %u\n", alt_num, iface_num, config->desc.bConfigurationValue); return NULL; } EXPORT_SYMBOL_GPL(usb_find_alt_setting); /** * usb_ifnum_to_if - get the interface object with a given interface number * @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. * * 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(const struct usb_device *dev, unsigned ifnum) { struct usb_host_config *config = dev->actconfig; int i; if (!config) return NULL; for (i = 0; i < config->desc.bNumInterfaces; i++) if (config->interface[i]->altsetting[0] .desc.bInterfaceNumber == ifnum) return config->interface[i]; return NULL; } EXPORT_SYMBOL_GPL(usb_ifnum_to_if); /** * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number. * @intf: the interface containing the altsetting in question * @altnum: the desired alternate setting number * * This searches the altsetting array of the specified interface for * an entry with the correct bAlternateSetting value and returns a pointer * to that entry, or null. * * Note that altsettings need not be stored sequentially by number, so * it would be incorrect to assume that the first altsetting entry in * the array corresponds to altsetting zero. This routine helps device * drivers avoid such mistakes. * * 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( const struct usb_interface *intf, unsigned int altnum) { int i; for (i = 0; i < intf->num_altsetting; i++) { if (intf->altsetting[i].desc.bAlternateSetting == altnum) return &intf->altsetting[i]; } return NULL; } EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); struct find_interface_arg { int minor; struct device_driver *drv; }; static int __find_interface(struct device *dev, void *data) { struct find_interface_arg *arg = data; struct usb_interface *intf; if (!is_usb_interface(dev)) return 0; if (dev->driver != arg->drv) return 0; intf = to_usb_interface(dev); return intf->minor == arg->minor; } /** * 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 bus device list and returns a pointer to the interface * with the matching minor and driver. 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 find_interface_arg argb; struct device *dev; argb.minor = minor; argb.drv = &drv->drvwrap.driver; dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface); /* Drop reference count from bus_find_device */ put_device(dev); return dev ? to_usb_interface(dev) : NULL; } EXPORT_SYMBOL_GPL(usb_find_interface); /** * 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; struct usb_hcd *hcd; udev = to_usb_device(dev); hcd = bus_to_hcd(udev->bus); usb_destroy_configuration(udev); usb_release_bos_descriptor(udev); usb_put_hcd(hcd); kfree(udev->product); kfree(udev->manufacturer); kfree(udev->serial); kfree(udev); } #ifdef CONFIG_HOTPLUG static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) { struct usb_device *usb_dev; usb_dev = to_usb_device(dev); if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum)) return -ENOMEM; if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum)) return -ENOMEM; return 0; } #else static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env) { return -ENODEV; } #endif /* CONFIG_HOTPLUG */ #ifdef CONFIG_PM /* USB device Power-Management thunks. * There's no need to distinguish here between quiescing a USB device * and powering it down; the generic_suspend() routine takes care of * it by skipping the usb_port_suspend() call for a quiesce. And for * USB interfaces there's no difference at all. */ static int usb_dev_prepare(struct device *dev) { return 0; /* Implement eventually? */ } static void usb_dev_complete(struct device *dev) { /* Currently used only for rebinding interfaces */ usb_resume_complete(dev); } static int usb_dev_suspend(struct device *dev) { return usb_suspend(dev, PMSG_SUSPEND); } static int usb_dev_resume(struct device *dev) { return usb_resume(dev, PMSG_RESUME); } static int usb_dev_freeze(struct device *dev) { return usb_suspend(dev, PMSG_FREEZE); } static int usb_dev_thaw(struct device *dev) { return usb_resume(dev, PMSG_THAW); } static int usb_dev_poweroff(struct device *dev) { return usb_suspend(dev, PMSG_HIBERNATE); } static int usb_dev_restore(struct device *dev) { return usb_resume(dev, PMSG_RESTORE); } static const struct dev_pm_ops usb_device_pm_ops = { .prepare = usb_dev_prepare, .complete = usb_dev_complete, .suspend = usb_dev_suspend, .resume = usb_dev_resume, .freeze = usb_dev_freeze, .thaw = usb_dev_thaw, .poweroff = usb_dev_poweroff, .restore = usb_dev_restore, #ifdef CONFIG_USB_SUSPEND .runtime_suspend = usb_runtime_suspend, .runtime_resume = usb_runtime_resume, .runtime_idle = usb_runtime_idle, #endif }; #endif /* CONFIG_PM */ static char *usb_devnode(struct device *dev, umode_t *mode) { struct usb_device *usb_dev; usb_dev = to_usb_device(dev); return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d", usb_dev->bus->busnum, usb_dev->devnum); } struct device_type usb_device_type = { .name = "usb_device", .release = usb_release_dev, .uevent = usb_dev_uevent, .devnode = usb_devnode, #ifdef CONFIG_PM .pm = &usb_device_pm_ops, #endif }; /* Returns 1 if @usb_bus is WUSB, 0 otherwise */ static unsigned usb_bus_is_wusb(struct usb_bus *bus) { struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self); return hcd->wireless; } /** * usb_alloc_dev - usb device constructor (usbcore-internal) * @parent: hub to which device is connected; null to allocate a root hub * @bus: bus used to access the device * @port1: one-based index of port; ignored for root hubs * Context: !in_interrupt() * * Only hub drivers (including virtual root hub drivers for host * controllers) should ever call this. * * This call may not be used in a non-sleeping context. */ struct usb_device *usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1) { struct usb_device *dev; struct usb_hcd *usb_hcd = container_of(bus, struct usb_hcd, self); unsigned root_hub = 0; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return NULL; if (!usb_get_hcd(bus_to_hcd(bus))) { kfree(dev); return NULL; } /* Root hubs aren't true devices, so don't allocate HCD resources */ if (usb_hcd->driver->alloc_dev && parent && !usb_hcd->driver->alloc_dev(usb_hcd, dev)) { usb_put_hcd(bus_to_hcd(bus)); kfree(dev); return NULL; } device_initialize(&dev->dev); dev->dev.bus = &usb_bus_type; dev->dev.type = &usb_device_type; dev->dev.groups = usb_device_groups; dev->dev.dma_mask = bus->controller->dma_mask; set_dev_node(&dev->dev, dev_to_node(bus->controller)); dev->state = USB_STATE_ATTACHED; atomic_set(&dev->urbnum, 0); INIT_LIST_HEAD(&dev->ep0.urb_list); dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; /* ep0 maxpacket comes later, from device descriptor */ usb_enable_endpoint(dev, &dev->ep0, false); dev->can_submit = 1; /* Save readable and stable topology id, distinguishing devices * by location for diagnostics, tools, driver model, etc. The * string is a path along hub ports, from the root. Each device's * dev->devpath will be stable until USB is re-cabled, and hubs * are often labeled with these port numbers. The name isn't * as stable: bus->busnum changes easily from modprobe order, * cardbus or pci hotplugging, and so on. */ if (unlikely(!parent)) { dev->devpath[0] = '0'; dev->route = 0; dev->dev.parent = bus->controller; dev_set_name(&dev->dev, "usb%d", bus->busnum); root_hub = 1; } else { /* match any labeling on the hubs; it's one-based */ if (parent->devpath[0] == '0') { snprintf(dev->devpath, sizeof dev->devpath, "%d", port1); /* Root ports are not counted in route string */ dev->route = 0; } else { snprintf(dev->devpath, sizeof dev->devpath, "%s.%d", parent->devpath, port1); /* Route string assumes hubs have less than 16 ports */ if (port1 < 15) dev->route = parent->route + (port1 << ((parent->level - 1)*4)); else dev->route = parent->route + (15 << ((parent->level - 1)*4)); } dev->dev.parent = &parent->dev; dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); /* hub driver sets up TT records */ } dev->portnum = port1; dev->bus = bus; dev->parent = parent; INIT_LIST_HEAD(&dev->filelist); #ifdef CONFIG_PM pm_runtime_set_autosuspend_delay(&dev->dev, usb_autosuspend_delay * 1000); dev->connect_time = jiffies; dev->active_duration = -jiffies; #endif if (root_hub) /* Root hub always ok [and always wired] */ dev->authorized = 1; else { dev->authorized = usb_hcd->authorized_default; dev->wusb = usb_bus_is_wusb(bus)? 1 : 0; } 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) { if (dev) get_device(&dev->dev); return dev; } EXPORT_SYMBOL_GPL(usb_get_dev); /** * 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); } EXPORT_SYMBOL_GPL(usb_put_dev);