| 1,1547 → 1,1563 |
|---|
| /* |
| * drivers/usb/usb.c |
| * |
| * (C) Copyright Linus Torvalds 1999 |
| * (C) Copyright Johannes Erdfelt 1999-2001 |
| * (C) Copyright Andreas Gal 1999 |
| * (C) Copyright Gregory P. Smith 1999 |
| * (C) Copyright Deti Fliegl 1999 (new USB architecture) |
| * (C) Copyright Randy Dunlap 2000 |
| * (C) Copyright David Brownell 2000-2001 (kernel hotplug, usb_device_id, |
| more docs, etc) |
| * (C) Copyright Yggdrasil Computing, Inc. 2000 |
| * (usb_device_id matching changes by Adam J. Richter) |
| * (C) Copyright Greg Kroah-Hartman 2002-2003 |
| * |
| * NOTE! This is not actually a driver at all, rather this is |
| * just a collection of helper routines that implement the |
| * generic USB things that the real drivers can use.. |
| * |
| * Think of this as a "USB library" rather than anything else. |
| * It should be considered a slave, with no callbacks. Callbacks |
| * are evil. |
| */ |
| |
| #include <linuxcomp.h> |
| |
| #include <linux/config.h> |
| |
| #ifdef CONFIG_USB_DEBUG |
| #define DEBUG |
| #else |
| #undef DEBUG |
| #endif |
| |
| #include <linux/module.h> |
| #include <linux/string.h> |
| #include <linux/bitops.h> |
| #include <linux/slab.h> |
| #include <linux/interrupt.h> /* for in_interrupt() */ |
| #include <linux/kmod.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/errno.h> |
| #include <linux/smp_lock.h> |
| #include <linux/usb.h> |
| |
| #include <asm/io.h> |
| #include <asm/scatterlist.h> |
| #include <linux/mm.h> |
| #include <linux/dma-mapping.h> |
| |
| #include "hcd.h" |
| #include "usb.h" |
| |
| extern int usb_hub_init(void); |
| extern void usb_hub_cleanup(void); |
| extern int usb_major_init(void); |
| extern void usb_major_cleanup(void); |
| extern int usb_host_init(void); |
| extern void usb_host_cleanup(void); |
| |
| |
| int nousb; /* Disable USB when built into kernel image */ |
| /* Not honored on modular build */ |
| |
| |
| static int generic_probe (struct device *dev) |
| { |
| return 0; |
| } |
| static int generic_remove (struct device *dev) |
| { |
| return 0; |
| } |
| |
| static struct device_driver usb_generic_driver = { |
| .name = "usb", |
| .bus = &usb_bus_type, |
| .probe = generic_probe, |
| .remove = generic_remove, |
| }; |
| |
| static int usb_generic_driver_data; |
| |
| /* needs to be called with BKL held */ |
| int usb_probe_interface(struct device *dev) |
| { |
| struct usb_interface * intf = to_usb_interface(dev); |
| struct usb_driver * driver = to_usb_driver(dev->driver); |
| const struct usb_device_id *id; |
| int error = -ENODEV; |
| |
| dev_dbg(dev, "%s\n", __FUNCTION__); |
| |
| if (!driver->probe) |
| return error; |
| |
| id = usb_match_id (intf, driver->id_table); |
| if (id) { |
| dev_dbg (dev, "%s - got id\n", __FUNCTION__); |
| down (&driver->serialize); |
| error = driver->probe (intf, id); |
| up (&driver->serialize); |
| } |
| if (!error) |
| intf->driver = driver; |
| |
| return error; |
| } |
| |
| int usb_unbind_interface(struct device *dev) |
| { |
| struct usb_interface *intf = to_usb_interface(dev); |
| struct usb_driver *driver = to_usb_driver(dev->driver); |
| |
| down(&driver->serialize); |
| |
| /* release all urbs for this interface */ |
| usb_disable_interface(interface_to_usbdev(intf), intf); |
| |
| if (intf->driver && intf->driver->disconnect) |
| intf->driver->disconnect(intf); |
| |
| /* force a release and re-initialize the interface */ |
| usb_driver_release_interface(driver, intf); |
| |
| up(&driver->serialize); |
| |
| return 0; |
| } |
| |
| /** |
| * usb_register - register a USB driver |
| * @new_driver: USB operations for the driver |
| * |
| * Registers a USB driver with the USB core. The list of unattached |
| * interfaces will be rescanned whenever a new driver is added, allowing |
| * the new driver to attach to any recognized devices. |
| * Returns a negative error code on failure and 0 on success. |
| * |
| * NOTE: if you want your driver to use the USB major number, you must call |
| * usb_register_dev() to enable that functionality. This function no longer |
| * takes care of that. |
| */ |
| int usb_register(struct usb_driver *new_driver) |
| { |
| int retval = 0; |
| |
| if (nousb) |
| return -ENODEV; |
| |
| new_driver->driver.name = (char *)new_driver->name; |
| new_driver->driver.bus = &usb_bus_type; |
| new_driver->driver.probe = usb_probe_interface; |
| new_driver->driver.remove = usb_unbind_interface; |
| |
| init_MUTEX(&new_driver->serialize); |
| |
| retval = driver_register(&new_driver->driver); |
| |
| if (!retval) { |
| info("registered new driver %s", new_driver->name); |
| usbfs_update_special(); |
| } else { |
| err("problem %d when registering driver %s", |
| retval, new_driver->name); |
| } |
| |
| return retval; |
| } |
| |
| /** |
| * usb_deregister - unregister a USB driver |
| * @driver: USB operations of the driver to unregister |
| * Context: !in_interrupt (), must be called with BKL held |
| * |
| * Unlinks the specified driver from the internal USB driver list. |
| * |
| * NOTE: If you called usb_register_dev(), you still need to call |
| * usb_deregister_dev() to clean up your driver's allocated minor numbers, |
| * this * call will no longer do it for you. |
| */ |
| void usb_deregister(struct usb_driver *driver) |
| { |
| info("deregistering driver %s", driver->name); |
| |
| driver_unregister (&driver->driver); |
| |
| usbfs_update_special(); |
| } |
| |
| /** |
| * usb_ifnum_to_if - get the interface object with a given interface number (usbcore-internal) |
| * @dev: the device whose current configuration is considered |
| * @ifnum: the desired interface |
| * |
| * This walks the device descriptor for the currently active configuration |
| * and returns a pointer to the interface with that particular interface |
| * number, or null. |
| * |
| * Note that configuration descriptors are not required to assign interface |
| * numbers sequentially, so that it would be incorrect to assume that |
| * the first interface in that descriptor corresponds to interface zero. |
| * This routine helps device drivers avoid such mistakes. |
| * However, you should make sure that you do the right thing with any |
| * alternate settings available for this interfaces. |
| */ |
| struct usb_interface *usb_ifnum_to_if(struct usb_device *dev, unsigned ifnum) |
| { |
| int i; |
| |
| for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) |
| if (dev->actconfig->interface[i]->altsetting[0] |
| .desc.bInterfaceNumber == ifnum) |
| return dev->actconfig->interface[i]; |
| |
| return NULL; |
| } |
| |
| /** |
| * usb_epnum_to_ep_desc - get the endpoint object with a given endpoint number |
| * @dev: the device whose current configuration+altsettings is considered |
| * @epnum: the desired endpoint, masked with USB_DIR_IN as appropriate. |
| * |
| * This walks the device descriptor for the currently active configuration, |
| * and returns a pointer to the endpoint with that particular endpoint |
| * number, or null. |
| * |
| * Note that interface descriptors are not required to list endpoint |
| * numbers in any standardized order, so that it would be wrong to |
| * assume that ep2in precedes either ep5in, ep2out, or even ep1out. |
| * This routine helps device drivers avoid such mistakes. |
| */ |
| struct usb_endpoint_descriptor * |
| usb_epnum_to_ep_desc(struct usb_device *dev, unsigned epnum) |
| { |
| int i, k; |
| |
| for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { |
| struct usb_interface *intf; |
| struct usb_host_interface *alt; |
| |
| /* only endpoints in current altseting are active */ |
| intf = dev->actconfig->interface[i]; |
| alt = intf->altsetting + intf->act_altsetting; |
| |
| for (k = 0; k < alt->desc.bNumEndpoints; k++) |
| if (epnum == alt->endpoint[k].desc.bEndpointAddress) |
| return &alt->endpoint[k].desc; |
| } |
| |
| return NULL; |
| } |
| |
| /** |
| * usb_driver_claim_interface - bind a driver to an interface |
| * @driver: the driver to be bound |
| * @iface: the interface to which it will be bound |
| * @priv: driver data associated with that interface |
| * |
| * This is used by usb device drivers that need to claim more than one |
| * interface on a device when probing (audio and acm are current examples). |
| * No device driver should directly modify internal usb_interface or |
| * usb_device structure members. |
| * |
| * Few drivers should need to use this routine, since the most natural |
| * way to bind to an interface is to return the private data from |
| * the driver's probe() method. |
| */ |
| int usb_driver_claim_interface(struct usb_driver *driver, struct usb_interface *iface, void* priv) |
| { |
| if (!iface || !driver) |
| return -EINVAL; |
| |
| /* this is mainly to lock against usbfs */ |
| lock_kernel(); |
| if (iface->driver) { |
| unlock_kernel(); |
| err ("%s driver booted %s off interface %p", |
| driver->name, iface->driver->name, iface); |
| return -EBUSY; |
| } else { |
| dbg("%s driver claimed interface %p", driver->name, iface); |
| } |
| |
| iface->driver = driver; |
| usb_set_intfdata(iface, priv); |
| unlock_kernel(); |
| return 0; |
| } |
| |
| /** |
| * usb_interface_claimed - returns true iff an interface is claimed |
| * @iface: the interface being checked |
| * |
| * This should be used by drivers to check other interfaces to see if |
| * they are available or not. If another driver has claimed the interface, |
| * they may not claim it. Otherwise it's OK to claim it using |
| * usb_driver_claim_interface(). |
| * |
| * Returns true (nonzero) iff the interface is claimed, else false (zero). |
| */ |
| int usb_interface_claimed(struct usb_interface *iface) |
| { |
| if (!iface) |
| return 0; |
| |
| return (iface->driver != NULL); |
| } /* usb_interface_claimed() */ |
| |
| /** |
| * usb_driver_release_interface - unbind a driver from an interface |
| * @driver: the driver to be unbound |
| * @iface: the interface from which it will be unbound |
| * |
| * In addition to unbinding the driver, this re-initializes the interface |
| * by selecting altsetting 0, the default alternate setting. |
| * |
| * This can be used by drivers to release an interface without waiting |
| * for their disconnect() methods to be called. |
| * |
| * When the USB subsystem disconnect()s a driver from some interface, |
| * it automatically invokes this method for that interface. That |
| * means that even drivers that used usb_driver_claim_interface() |
| * usually won't need to call this. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| */ |
| void usb_driver_release_interface(struct usb_driver *driver, struct usb_interface *iface) |
| { |
| /* this should never happen, don't release something that's not ours */ |
| if (iface->driver && iface->driver != driver) |
| return; |
| |
| usb_set_interface(interface_to_usbdev(iface), |
| iface->altsetting[0].desc.bInterfaceNumber, |
| 0); |
| usb_set_intfdata(iface, NULL); |
| iface->driver = NULL; |
| } |
| |
| /** |
| * usb_match_id - find first usb_device_id matching device or interface |
| * @interface: the interface of interest |
| * @id: array of usb_device_id structures, terminated by zero entry |
| * |
| * usb_match_id searches an array of usb_device_id's and returns |
| * the first one matching the device or interface, or null. |
| * This is used when binding (or rebinding) a driver to an interface. |
| * Most USB device drivers will use this indirectly, through the usb core, |
| * but some layered driver frameworks use it directly. |
| * These device tables are exported with MODULE_DEVICE_TABLE, through |
| * modutils and "modules.usbmap", to support the driver loading |
| * functionality of USB hotplugging. |
| * |
| * What Matches: |
| * |
| * The "match_flags" element in a usb_device_id controls which |
| * members are used. If the corresponding bit is set, the |
| * value in the device_id must match its corresponding member |
| * in the device or interface descriptor, or else the device_id |
| * does not match. |
| * |
| * "driver_info" is normally used only by device drivers, |
| * but you can create a wildcard "matches anything" usb_device_id |
| * as a driver's "modules.usbmap" entry if you provide an id with |
| * only a nonzero "driver_info" field. If you do this, the USB device |
| * driver's probe() routine should use additional intelligence to |
| * decide whether to bind to the specified interface. |
| * |
| * What Makes Good usb_device_id Tables: |
| * |
| * The match algorithm is very simple, so that intelligence in |
| * driver selection must come from smart driver id records. |
| * Unless you have good reasons to use another selection policy, |
| * provide match elements only in related groups, and order match |
| * specifiers from specific to general. Use the macros provided |
| * for that purpose if you can. |
| * |
| * The most specific match specifiers use device descriptor |
| * data. These are commonly used with product-specific matches; |
| * the USB_DEVICE macro lets you provide vendor and product IDs, |
| * and you can also match against ranges of product revisions. |
| * These are widely used for devices with application or vendor |
| * specific bDeviceClass values. |
| * |
| * Matches based on device class/subclass/protocol specifications |
| * are slightly more general; use the USB_DEVICE_INFO macro, or |
| * its siblings. These are used with single-function devices |
| * where bDeviceClass doesn't specify that each interface has |
| * its own class. |
| * |
| * Matches based on interface class/subclass/protocol are the |
| * most general; they let drivers bind to any interface on a |
| * multiple-function device. Use the USB_INTERFACE_INFO |
| * macro, or its siblings, to match class-per-interface style |
| * devices (as recorded in bDeviceClass). |
| * |
| * Within those groups, remember that not all combinations are |
| * meaningful. For example, don't give a product version range |
| * without vendor and product IDs; or specify a protocol without |
| * its associated class and subclass. |
| */ |
| const struct usb_device_id * |
| usb_match_id(struct usb_interface *interface, const struct usb_device_id *id) |
| { |
| struct usb_host_interface *intf; |
| struct usb_device *dev; |
| |
| /* proc_connectinfo in devio.c may call us with id == NULL. */ |
| if (id == NULL) |
| return NULL; |
| |
| intf = &interface->altsetting [interface->act_altsetting]; |
| dev = interface_to_usbdev(interface); |
| |
| /* It is important to check that id->driver_info is nonzero, |
| since an entry that is all zeroes except for a nonzero |
| id->driver_info is the way to create an entry that |
| indicates that the driver want to examine every |
| device and interface. */ |
| for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass || |
| id->driver_info; id++) { |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
| id->idVendor != dev->descriptor.idVendor) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && |
| id->idProduct != dev->descriptor.idProduct) |
| continue; |
| |
| /* No need to test id->bcdDevice_lo != 0, since 0 is never |
| greater than any unsigned number. */ |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && |
| (id->bcdDevice_lo > dev->descriptor.bcdDevice)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && |
| (id->bcdDevice_hi < dev->descriptor.bcdDevice)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && |
| (id->bDeviceClass != dev->descriptor.bDeviceClass)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && |
| (id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && |
| (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && |
| (id->bInterfaceClass != intf->desc.bInterfaceClass)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && |
| (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && |
| (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) |
| continue; |
| |
| return id; |
| } |
| |
| return NULL; |
| } |
| |
| /** |
| * usb_find_interface - find usb_interface pointer for driver and device |
| * @drv: the driver whose current configuration is considered |
| * @minor: the minor number of the desired device |
| * |
| * This walks the driver device list and returns a pointer to the interface |
| * with the matching minor. Note, this only works for devices that share the |
| * USB major number. |
| */ |
| struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) |
| { |
| struct list_head *entry; |
| struct device *dev; |
| struct usb_interface *intf; |
| |
| list_for_each(entry, &drv->driver.devices) { |
| dev = container_of(entry, struct device, driver_list); |
| |
| /* can't look at usb devices, only interfaces */ |
| if (dev->driver == &usb_generic_driver) |
| continue; |
| |
| intf = to_usb_interface(dev); |
| if (intf->minor == -1) |
| continue; |
| if (intf->minor == minor) |
| return intf; |
| } |
| |
| /* no device found that matches */ |
| return NULL; |
| } |
| |
| static int usb_device_match (struct device *dev, struct device_driver *drv) |
| { |
| struct usb_interface *intf; |
| struct usb_driver *usb_drv; |
| const struct usb_device_id *id; |
| |
| /* check for generic driver, which we don't match any device with */ |
| if (drv == &usb_generic_driver) |
| return 0; |
| |
| intf = to_usb_interface(dev); |
| |
| usb_drv = to_usb_driver(drv); |
| id = usb_drv->id_table; |
| |
| id = usb_match_id (intf, usb_drv->id_table); |
| if (id) |
| return 1; |
| |
| return 0; |
| } |
| |
| |
| #ifdef CONFIG_HOTPLUG |
| |
| /* |
| * USB hotplugging invokes what /proc/sys/kernel/hotplug says |
| * (normally /sbin/hotplug) when USB devices get added or removed. |
| * |
| * This invokes a user mode policy agent, typically helping to load driver |
| * or other modules, configure the device, and more. Drivers can provide |
| * a MODULE_DEVICE_TABLE to help with module loading subtasks. |
| * |
| * We're called either from khubd (the typical case) or from root hub |
| * (init, kapmd, modprobe, rmmod, etc), but the agents need to handle |
| * delays in event delivery. Use sysfs (and DEVPATH) to make sure the |
| * device (and this configuration!) are still present. |
| */ |
| static int usb_hotplug (struct device *dev, char **envp, int num_envp, |
| char *buffer, int buffer_size) |
| { |
| struct usb_interface *intf; |
| struct usb_device *usb_dev; |
| char *scratch; |
| int i = 0; |
| int length = 0; |
| |
| dbg ("%s", __FUNCTION__); |
| |
| if (!dev) |
| return -ENODEV; |
| |
| /* Must check driver_data here, as on remove driver is always NULL */ |
| if ((dev->driver == &usb_generic_driver) || |
| (dev->driver_data == &usb_generic_driver_data)) |
| return 0; |
| |
| intf = to_usb_interface(dev); |
| usb_dev = interface_to_usbdev (intf); |
| |
| if (usb_dev->devnum < 0) { |
| dbg ("device already deleted ??"); |
| return -ENODEV; |
| } |
| if (!usb_dev->bus) { |
| dbg ("bus already removed?"); |
| return -ENODEV; |
| } |
| |
| scratch = buffer; |
| |
| #ifdef CONFIG_USB_DEVICEFS |
| /* If this is available, userspace programs can directly read |
| * all the device descriptors we don't tell them about. Or |
| * even act as usermode drivers. |
| * |
| * FIXME reduce hardwired intelligence here |
| */ |
| envp [i++] = scratch; |
| length += snprintf (scratch, buffer_size - length, |
| "DEVICE=/proc/bus/usb/%03d/%03d", |
| usb_dev->bus->busnum, usb_dev->devnum); |
| if ((buffer_size - length <= 0) || (i >= num_envp)) |
| return -ENOMEM; |
| ++length; |
| scratch += length; |
| #endif |
| |
| /* per-device configurations are common */ |
| envp [i++] = scratch; |
| length += snprintf (scratch, buffer_size - length, "PRODUCT=%x/%x/%x", |
| usb_dev->descriptor.idVendor, |
| usb_dev->descriptor.idProduct, |
| usb_dev->descriptor.bcdDevice); |
| if ((buffer_size - length <= 0) || (i >= num_envp)) |
| return -ENOMEM; |
| ++length; |
| scratch += length; |
| |
| /* class-based driver binding models */ |
| envp [i++] = scratch; |
| length += snprintf (scratch, buffer_size - length, "TYPE=%d/%d/%d", |
| usb_dev->descriptor.bDeviceClass, |
| usb_dev->descriptor.bDeviceSubClass, |
| usb_dev->descriptor.bDeviceProtocol); |
| if ((buffer_size - length <= 0) || (i >= num_envp)) |
| return -ENOMEM; |
| ++length; |
| scratch += length; |
| |
| if (usb_dev->descriptor.bDeviceClass == 0) { |
| int alt = intf->act_altsetting; |
| |
| /* 2.4 only exposed interface zero. in 2.5, hotplug |
| * agents are called for all interfaces, and can use |
| * $DEVPATH/bInterfaceNumber if necessary. |
| */ |
| envp [i++] = scratch; |
| length += snprintf (scratch, buffer_size - length, |
| "INTERFACE=%d/%d/%d", |
| intf->altsetting[alt].desc.bInterfaceClass, |
| intf->altsetting[alt].desc.bInterfaceSubClass, |
| intf->altsetting[alt].desc.bInterfaceProtocol); |
| if ((buffer_size - length <= 0) || (i >= num_envp)) |
| return -ENOMEM; |
| ++length; |
| scratch += length; |
| |
| } |
| envp [i++] = 0; |
| |
| return 0; |
| } |
| |
| #else |
| |
| static int usb_hotplug (struct device *dev, char **envp, |
| int num_envp, char *buffer, int buffer_size) |
| { |
| return -ENODEV; |
| } |
| |
| #endif /* CONFIG_HOTPLUG */ |
| |
| /** |
| * usb_release_dev - free a usb device structure when all users of it are finished. |
| * @dev: device that's been disconnected |
| * |
| * Will be called only by the device core when all users of this usb device are |
| * done. |
| */ |
| static void usb_release_dev(struct device *dev) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| |
| if (udev->bus && udev->bus->op && udev->bus->op->deallocate) |
| udev->bus->op->deallocate(udev); |
| usb_destroy_configuration(udev); |
| usb_bus_put(udev->bus); |
| kfree (udev); |
| } |
| |
| /** |
| * usb_alloc_dev - allocate a usb device structure (usbcore-internal) |
| * @parent: hub to which device is connected |
| * @bus: bus used to access the device |
| * Context: !in_interrupt () |
| * |
| * Only hub drivers (including virtual root hub drivers for host |
| * controllers) should ever call this. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| */ |
| struct usb_device *usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus) |
| { |
| struct usb_device *dev; |
| |
| dev = kmalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return NULL; |
| |
| memset(dev, 0, sizeof(*dev)); |
| |
| bus = usb_bus_get(bus); |
| if (!bus) { |
| kfree(dev); |
| return NULL; |
| } |
| |
| device_initialize(&dev->dev); |
| dev->dev.release = usb_release_dev; |
| dev->state = USB_STATE_ATTACHED; |
| |
| if (!parent) |
| dev->devpath [0] = '0'; |
| dev->bus = bus; |
| dev->parent = parent; |
| INIT_LIST_HEAD(&dev->filelist); |
| |
| init_MUTEX(&dev->serialize); |
| |
| if (dev->bus->op->allocate) |
| dev->bus->op->allocate(dev); |
| |
| return dev; |
| } |
| |
| /** |
| * usb_get_dev - increments the reference count of the usb device structure |
| * @dev: the device being referenced |
| * |
| * Each live reference to a device should be refcounted. |
| * |
| * Drivers for USB interfaces should normally record such references in |
| * their probe() methods, when they bind to an interface, and release |
| * them by calling usb_put_dev(), in their disconnect() methods. |
| * |
| * A pointer to the device with the incremented reference counter is returned. |
| */ |
| struct usb_device *usb_get_dev (struct usb_device *dev) |
| { |
| struct device *tmp; |
| |
| if (!dev) |
| return NULL; |
| |
| tmp = get_device(&dev->dev); |
| if (tmp) |
| return to_usb_device(tmp); |
| else |
| return NULL; |
| } |
| |
| /** |
| * usb_put_dev - release a use of the usb device structure |
| * @dev: device that's been disconnected |
| * |
| * Must be called when a user of a device is finished with it. When the last |
| * user of the device calls this function, the memory of the device is freed. |
| */ |
| void usb_put_dev(struct usb_device *dev) |
| { |
| if (dev) |
| put_device(&dev->dev); |
| } |
| |
| static struct usb_device *match_device(struct usb_device *dev, |
| u16 vendor_id, u16 product_id) |
| { |
| struct usb_device *ret_dev = NULL; |
| int child; |
| |
| dbg("looking at vendor %d, product %d", |
| dev->descriptor.idVendor, |
| dev->descriptor.idProduct); |
| |
| /* see if this device matches */ |
| if ((dev->descriptor.idVendor == vendor_id) && |
| (dev->descriptor.idProduct == product_id)) { |
| dbg ("found the device!"); |
| ret_dev = usb_get_dev(dev); |
| goto exit; |
| } |
| |
| /* look through all of the children of this device */ |
| for (child = 0; child < dev->maxchild; ++child) { |
| if (dev->children[child]) { |
| ret_dev = match_device(dev->children[child], |
| vendor_id, product_id); |
| if (ret_dev) |
| goto exit; |
| } |
| } |
| exit: |
| return ret_dev; |
| } |
| |
| /** |
| * usb_find_device - find a specific usb device in the system |
| * @vendor_id: the vendor id of the device to find |
| * @product_id: the product id of the device to find |
| * |
| * Returns a pointer to a struct usb_device if such a specified usb |
| * device is present in the system currently. The usage count of the |
| * device will be incremented if a device is found. Make sure to call |
| * usb_put_dev() when the caller is finished with the device. |
| * |
| * If a device with the specified vendor and product id is not found, |
| * NULL is returned. |
| */ |
| struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) |
| { |
| struct list_head *buslist; |
| struct usb_bus *bus; |
| struct usb_device *dev = NULL; |
| |
| down(&usb_bus_list_lock); |
| for (buslist = usb_bus_list.next; |
| buslist != &usb_bus_list; |
| buslist = buslist->next) { |
| bus = container_of(buslist, struct usb_bus, bus_list); |
| dev = match_device(bus->root_hub, vendor_id, product_id); |
| if (dev) |
| goto exit; |
| } |
| exit: |
| up(&usb_bus_list_lock); |
| return dev; |
| } |
| |
| /** |
| * usb_get_current_frame_number - return current bus frame number |
| * @dev: the device whose bus is being queried |
| * |
| * Returns the current frame number for the USB host controller |
| * used with the given USB device. This can be used when scheduling |
| * isochronous requests. |
| * |
| * Note that different kinds of host controller have different |
| * "scheduling horizons". While one type might support scheduling only |
| * 32 frames into the future, others could support scheduling up to |
| * 1024 frames into the future. |
| */ |
| int usb_get_current_frame_number(struct usb_device *dev) |
| { |
| return dev->bus->op->get_frame_number (dev); |
| } |
| |
| /*-------------------------------------------------------------------*/ |
| /* |
| * __usb_get_extra_descriptor() finds a descriptor of specific type in the |
| * extra field of the interface and endpoint descriptor structs. |
| */ |
| |
| int __usb_get_extra_descriptor(char *buffer, unsigned size, unsigned char type, void **ptr) |
| { |
| struct usb_descriptor_header *header; |
| |
| while (size >= sizeof(struct usb_descriptor_header)) { |
| header = (struct usb_descriptor_header *)buffer; |
| |
| if (header->bLength < 2) { |
| err("invalid descriptor length of %d", header->bLength); |
| return -1; |
| } |
| |
| if (header->bDescriptorType == type) { |
| *ptr = header; |
| return 0; |
| } |
| |
| buffer += header->bLength; |
| size -= header->bLength; |
| } |
| return -1; |
| } |
| |
| /** |
| * usb_disconnect - disconnect a device (usbcore-internal) |
| * @pdev: pointer to device being disconnected |
| * Context: !in_interrupt () |
| * |
| * Something got disconnected. Get rid of it, and all of its children. |
| * |
| * Only hub drivers (including virtual root hub drivers for host |
| * controllers) should ever call this. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| */ |
| void usb_disconnect(struct usb_device **pdev) |
| { |
| struct usb_device *dev = *pdev; |
| struct usb_bus *bus; |
| struct usb_operations *ops; |
| int i; |
| |
| might_sleep (); |
| |
| if (!dev) { |
| pr_debug ("%s nodev\n", __FUNCTION__); |
| return; |
| } |
| bus = dev->bus; |
| if (!bus) { |
| pr_debug ("%s nobus\n", __FUNCTION__); |
| return; |
| } |
| ops = bus->op; |
| |
| *pdev = NULL; |
| |
| /* mark the device as inactive, so any further urb submissions for |
| * this device will fail. |
| */ |
| dev->state = USB_STATE_NOTATTACHED; |
| down(&dev->serialize); |
| |
| dev_info (&dev->dev, "USB disconnect, address %d\n", dev->devnum); |
| |
| /* Free up all the children before we remove this device */ |
| for (i = 0; i < USB_MAXCHILDREN; i++) { |
| struct usb_device **child = dev->children + i; |
| if (*child) |
| usb_disconnect(child); |
| } |
| |
| /* deallocate hcd/hardware state ... nuking all pending urbs and |
| * cleaning up all state associated with the current configuration |
| */ |
| usb_disable_device(dev, 0); |
| |
| dev_dbg (&dev->dev, "unregistering device\n"); |
| /* Free the device number and remove the /proc/bus/usb entry */ |
| if (dev->devnum > 0) { |
| clear_bit(dev->devnum, dev->bus->devmap.devicemap); |
| usbfs_remove_device(dev); |
| } |
| up(&dev->serialize); |
| device_unregister(&dev->dev); |
| } |
| |
| /** |
| * usb_choose_address - pick device address (usbcore-internal) |
| * @dev: newly detected device (in DEFAULT state) |
| * |
| * Picks a device address. It's up to the hub (or root hub) driver |
| * to handle and manage enumeration, starting from the DEFAULT state. |
| * Only hub drivers (but not virtual root hub drivers for host |
| * controllers) should ever call this. |
| */ |
| void usb_choose_address(struct usb_device *dev) |
| { |
| int devnum; |
| // FIXME needs locking for SMP!! |
| /* why? this is called only from the hub thread, |
| * which hopefully doesn't run on multiple CPU's simultaneously 8-) |
| */ |
| |
| /* Try to allocate the next devnum beginning at bus->devnum_next. */ |
| devnum = find_next_zero_bit(dev->bus->devmap.devicemap, 128, dev->bus->devnum_next); |
| if (devnum >= 128) |
| devnum = find_next_zero_bit(dev->bus->devmap.devicemap, 128, 1); |
| |
| dev->bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); |
| |
| if (devnum < 128) { |
| set_bit(devnum, dev->bus->devmap.devicemap); |
| dev->devnum = devnum; |
| } |
| } |
| |
| |
| // hub-only!! ... and only exported for reset/reinit path. |
| // otherwise used internally, for usb_new_device() |
| int usb_set_address(struct usb_device *dev) |
| { |
| int retval; |
| |
| if (dev->devnum == 0) |
| return -EINVAL; |
| if (dev->state != USB_STATE_DEFAULT && dev->state != USB_STATE_ADDRESS) |
| return -EINVAL; |
| retval = usb_control_msg(dev, usb_snddefctrl(dev), USB_REQ_SET_ADDRESS, |
| 0, dev->devnum, 0, NULL, 0, HZ * USB_CTRL_SET_TIMEOUT); |
| if (retval == 0) |
| dev->state = USB_STATE_ADDRESS; |
| return retval; |
| } |
| |
| /* |
| * By the time we get here, we chose a new device address |
| * and is in the default state. We need to identify the thing and |
| * get the ball rolling.. |
| * |
| * Returns 0 for success, != 0 for error. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * |
| * Only the hub driver should ever call this; root hub registration |
| * uses it only indirectly. |
| */ |
| #define NEW_DEVICE_RETRYS 2 |
| #define SET_ADDRESS_RETRYS 2 |
| int usb_new_device(struct usb_device *dev, struct device *parent) |
| { |
| int err = -EINVAL; |
| int i; |
| int j; |
| |
| /* |
| * Set the driver for the usb device to point to the "generic" driver. |
| * This prevents the main usb device from being sent to the usb bus |
| * probe function. Yes, it's a hack, but a nice one :) |
| * |
| * Do it asap, so more driver model stuff (like the device.h message |
| * utilities) can be used in hcd submit/unlink code paths. |
| */ |
| usb_generic_driver.bus = &usb_bus_type; |
| dev->dev.parent = parent; |
| dev->dev.driver = &usb_generic_driver; |
| dev->dev.bus = &usb_bus_type; |
| dev->dev.driver_data = &usb_generic_driver_data; |
| if (dev->dev.bus_id[0] == 0) |
| sprintf26 (&dev->dev.bus_id[0], "%d-%s", |
| dev->bus->busnum, dev->devpath); |
| |
| /* dma masks come from the controller; readonly, except to hcd */ |
| dev->dev.dma_mask = parent->dma_mask; |
| |
| /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
| * it's fixed size except for full speed devices. |
| */ |
| switch (dev->speed) { |
| case USB_SPEED_HIGH: /* fixed at 64 */ |
| i = 64; |
| break; |
| case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ |
| /* to determine the ep0 maxpacket size, read the first 8 |
| * bytes from the device descriptor to get bMaxPacketSize0; |
| * then correct our initial (small) guess. |
| */ |
| // FALLTHROUGH |
| case USB_SPEED_LOW: /* fixed at 8 */ |
| i = 8; |
| break; |
| default: |
| goto fail; |
| } |
| dev->epmaxpacketin [0] = i; |
| dev->epmaxpacketout[0] = i; |
| |
| for (i = 0; i < NEW_DEVICE_RETRYS; ++i) { |
| for (j = 0; j < SET_ADDRESS_RETRYS; ++j) { |
| err = usb_set_address(dev); |
| if (err >= 0) |
| break; |
| wait_ms(200); |
| } |
| if (err < 0) { |
| dev_err(&dev->dev, |
| "device not accepting address %d, error %d\n", |
| dev->devnum, err); |
| goto fail; |
| } |
| |
| wait_ms(10); /* Let the SET_ADDRESS settle */ |
| /* high and low speed devices don't need this... */ |
| |
| err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, &dev->descriptor, 8); |
| if (err >= 8) |
| break; |
| wait_ms(100); |
| } |
| |
| if (err < 8) { |
| dev_err(&dev->dev, "device descriptor read/8, error %d\n", err); |
| goto fail; |
| } |
| if (dev->speed == USB_SPEED_FULL) { |
| usb_disable_endpoint(dev, 0); |
| usb_endpoint_running(dev, 0, 1); |
| usb_endpoint_running(dev, 0, 0); |
| dev->epmaxpacketin [0] = dev->descriptor.bMaxPacketSize0; |
| dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0; |
| } |
| |
| /* USB device state == addressed ... still not usable */ |
| |
| err = usb_get_device_descriptor(dev); |
| if (err < (signed)sizeof(dev->descriptor)) { |
| dev_err(&dev->dev, "device descriptor read/all, error %d\n", err); |
| goto fail; |
| } |
| |
| err = usb_get_configuration(dev); |
| if (err < 0) { |
| dev_err(&dev->dev, "can't read configurations, error %d\n", |
| err); |
| goto fail; |
| } |
| |
| /* Tell the world! */ |
| dev_dbg(&dev->dev, "new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", |
| dev->descriptor.iManufacturer, dev->descriptor.iProduct, dev->descriptor.iSerialNumber); |
| |
| #ifdef DEBUG |
| if (dev->descriptor.iProduct) |
| usb_show_string(dev, "Product", dev->descriptor.iProduct); |
| if (dev->descriptor.iManufacturer) |
| usb_show_string(dev, "Manufacturer", dev->descriptor.iManufacturer); |
| if (dev->descriptor.iSerialNumber) |
| usb_show_string(dev, "SerialNumber", dev->descriptor.iSerialNumber); |
| #endif |
| |
| /* put device-specific files into sysfs */ |
| err = device_add (&dev->dev); |
| if (err) { |
| dev_err(&dev->dev, "can't device_add, error %d\n", err); |
| goto fail; |
| } |
| usb_create_driverfs_dev_files (dev); |
| |
| /* choose and set the configuration. that registers the interfaces |
| * with the driver core, and lets usb device drivers bind to them. |
| */ |
| if (dev->descriptor.bNumConfigurations != 1) { |
| dev_info(&dev->dev, |
| "configuration #%d chosen from %d choices\n", |
| dev->config[0].desc.bConfigurationValue, |
| dev->descriptor.bNumConfigurations); |
| } |
| err = usb_set_configuration(dev, |
| dev->config[0].desc.bConfigurationValue); |
| if (err) { |
| dev_err(&dev->dev, "can't set config #%d, error %d\n", |
| dev->config[0].desc.bConfigurationValue, err); |
| device_del(&dev->dev); |
| goto fail; |
| } |
| /* USB device state == configured ... usable */ |
| |
| /* add a /proc/bus/usb entry */ |
| usbfs_add_device(dev); |
| |
| return 0; |
| fail: |
| dev->state = USB_STATE_DEFAULT; |
| clear_bit(dev->devnum, dev->bus->devmap.devicemap); |
| dev->devnum = -1; |
| return err; |
| } |
| |
| /** |
| * usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP |
| * @dev: device the buffer will be used with |
| * @size: requested buffer size |
| * @mem_flags: affect whether allocation may block |
| * @dma: used to return DMA address of buffer |
| * |
| * Return value is either null (indicating no buffer could be allocated), or |
| * the cpu-space pointer to a buffer that may be used to perform DMA to the |
| * specified device. Such cpu-space buffers are returned along with the DMA |
| * address (through the pointer provided). |
| * |
| * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags |
| * to avoid behaviors like using "DMA bounce buffers", or tying down I/O |
| * mapping hardware for long idle periods. The implementation varies between |
| * platforms, depending on details of how DMA will work to this device. |
| * Using these buffers also helps prevent cacheline sharing problems on |
| * architectures where CPU caches are not DMA-coherent. |
| * |
| * When the buffer is no longer used, free it with usb_buffer_free(). |
| */ |
| void *usb_buffer_alloc ( |
| struct usb_device *dev, |
| size_t size, |
| int mem_flags, |
| dma_addr_t *dma |
| ) |
| { |
| if (!dev || !dev->bus || !dev->bus->op || !dev->bus->op->buffer_alloc) |
| return 0; |
| return dev->bus->op->buffer_alloc (dev->bus, size, mem_flags, dma); |
| } |
| |
| /** |
| * usb_buffer_free - free memory allocated with usb_buffer_alloc() |
| * @dev: device the buffer was used with |
| * @size: requested buffer size |
| * @addr: CPU address of buffer |
| * @dma: DMA address of buffer |
| * |
| * This reclaims an I/O buffer, letting it be reused. The memory must have |
| * been allocated using usb_buffer_alloc(), and the parameters must match |
| * those provided in that allocation request. |
| */ |
| void usb_buffer_free ( |
| struct usb_device *dev, |
| size_t size, |
| void *addr, |
| dma_addr_t dma |
| ) |
| { |
| if (!dev || !dev->bus || !dev->bus->op || !dev->bus->op->buffer_free) |
| return; |
| dev->bus->op->buffer_free (dev->bus, size, addr, dma); |
| } |
| |
| /** |
| * usb_buffer_map - create DMA mapping(s) for an urb |
| * @urb: urb whose transfer_buffer/setup_packet will be mapped |
| * |
| * Return value is either null (indicating no buffer could be mapped), or |
| * the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are |
| * added to urb->transfer_flags if the operation succeeds. If the device |
| * is connected to this system through a non-DMA controller, this operation |
| * always succeeds. |
| * |
| * This call would normally be used for an urb which is reused, perhaps |
| * as the target of a large periodic transfer, with usb_buffer_dmasync() |
| * calls to synchronize memory and dma state. |
| * |
| * Reverse the effect of this call with usb_buffer_unmap(). |
| */ |
| struct urb *usb_buffer_map (struct urb *urb) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!urb |
| || !urb->dev |
| || !(bus = urb->dev->bus) |
| || !(controller = bus->controller)) |
| return 0; |
| |
| if (controller->dma_mask) { |
| urb->transfer_dma = dma_map_single (controller, |
| urb->transfer_buffer, urb->transfer_buffer_length, |
| usb_pipein (urb->pipe) |
| ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| if (usb_pipecontrol (urb->pipe)) |
| urb->setup_dma = dma_map_single (controller, |
| urb->setup_packet, |
| sizeof (struct usb_ctrlrequest), |
| DMA_TO_DEVICE); |
| // FIXME generic api broken like pci, can't report errors |
| // if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; |
| } else |
| urb->transfer_dma = ~0; |
| urb->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP |
| | URB_NO_SETUP_DMA_MAP); |
| return urb; |
| } |
| |
| /** |
| * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) |
| * @urb: urb whose transfer_buffer/setup_packet will be synchronized |
| */ |
| void usb_buffer_dmasync (struct urb *urb) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!urb |
| || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) |
| || !urb->dev |
| || !(bus = urb->dev->bus) |
| || !(controller = bus->controller)) |
| return; |
| |
| if (controller->dma_mask) { |
| dma_sync_single (controller, |
| urb->transfer_dma, urb->transfer_buffer_length, |
| usb_pipein (urb->pipe) |
| ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| if (usb_pipecontrol (urb->pipe)) |
| dma_sync_single (controller, |
| urb->setup_dma, |
| sizeof (struct usb_ctrlrequest), |
| DMA_TO_DEVICE); |
| } |
| } |
| |
| /** |
| * usb_buffer_unmap - free DMA mapping(s) for an urb |
| * @urb: urb whose transfer_buffer will be unmapped |
| * |
| * Reverses the effect of usb_buffer_map(). |
| */ |
| void usb_buffer_unmap (struct urb *urb) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!urb |
| || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) |
| || !urb->dev |
| || !(bus = urb->dev->bus) |
| || !(controller = bus->controller)) |
| return; |
| |
| if (controller->dma_mask) { |
| dma_unmap_single (controller, |
| urb->transfer_dma, urb->transfer_buffer_length, |
| usb_pipein (urb->pipe) |
| ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| if (usb_pipecontrol (urb->pipe)) |
| dma_unmap_single (controller, |
| urb->setup_dma, |
| sizeof (struct usb_ctrlrequest), |
| DMA_TO_DEVICE); |
| } |
| urb->transfer_flags &= ~(URB_NO_TRANSFER_DMA_MAP |
| | URB_NO_SETUP_DMA_MAP); |
| } |
| |
| /** |
| * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint |
| * @dev: device to which the scatterlist will be mapped |
| * @pipe: endpoint defining the mapping direction |
| * @sg: the scatterlist to map |
| * @nents: the number of entries in the scatterlist |
| * |
| * Return value is either < 0 (indicating no buffers could be mapped), or |
| * the number of DMA mapping array entries in the scatterlist. |
| * |
| * The caller is responsible for placing the resulting DMA addresses from |
| * the scatterlist into URB transfer buffer pointers, and for setting the |
| * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. |
| * |
| * Top I/O rates come from queuing URBs, instead of waiting for each one |
| * to complete before starting the next I/O. This is particularly easy |
| * to do with scatterlists. Just allocate and submit one URB for each DMA |
| * mapping entry returned, stopping on the first error or when all succeed. |
| * Better yet, use the usb_sg_*() calls, which do that (and more) for you. |
| * |
| * This call would normally be used when translating scatterlist requests, |
| * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it |
| * may be able to coalesce mappings for improved I/O efficiency. |
| * |
| * Reverse the effect of this call with usb_buffer_unmap_sg(). |
| */ |
| int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe, |
| struct scatterlist *sg, int nents) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!dev |
| || usb_pipecontrol (pipe) |
| || !(bus = dev->bus) |
| || !(controller = bus->controller) |
| || !controller->dma_mask) |
| return -1; |
| |
| // FIXME generic api broken like pci, can't report errors |
| return dma_map_sg (controller, sg, nents, |
| usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| } |
| |
| /** |
| * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) |
| * @dev: device to which the scatterlist will be mapped |
| * @pipe: endpoint defining the mapping direction |
| * @sg: the scatterlist to synchronize |
| * @n_hw_ents: the positive return value from usb_buffer_map_sg |
| * |
| * Use this when you are re-using a scatterlist's data buffers for |
| * another USB request. |
| */ |
| void usb_buffer_dmasync_sg (struct usb_device *dev, unsigned pipe, |
| struct scatterlist *sg, int n_hw_ents) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!dev |
| || !(bus = dev->bus) |
| || !(controller = bus->controller) |
| || !controller->dma_mask) |
| return; |
| |
| dma_sync_sg (controller, sg, n_hw_ents, |
| usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| } |
| |
| /** |
| * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist |
| * @dev: device to which the scatterlist will be mapped |
| * @pipe: endpoint defining the mapping direction |
| * @sg: the scatterlist to unmap |
| * @n_hw_ents: the positive return value from usb_buffer_map_sg |
| * |
| * Reverses the effect of usb_buffer_map_sg(). |
| */ |
| void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe, |
| struct scatterlist *sg, int n_hw_ents) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!dev |
| || !(bus = dev->bus) |
| || !(controller = bus->controller) |
| || !controller->dma_mask) |
| return; |
| |
| dma_unmap_sg (controller, sg, n_hw_ents, |
| usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| } |
| |
| static int usb_device_suspend(struct device *dev, u32 state) |
| { |
| struct usb_interface *intf; |
| struct usb_driver *driver; |
| |
| if ((dev->driver == NULL) || |
| (dev->driver == &usb_generic_driver) || |
| (dev->driver_data == &usb_generic_driver_data)) |
| return 0; |
| |
| intf = to_usb_interface(dev); |
| driver = to_usb_driver(dev->driver); |
| |
| if (driver->suspend) |
| return driver->suspend(intf, state); |
| return 0; |
| } |
| |
| static int usb_device_resume(struct device *dev) |
| { |
| struct usb_interface *intf; |
| struct usb_driver *driver; |
| |
| if ((dev->driver == NULL) || |
| (dev->driver == &usb_generic_driver) || |
| (dev->driver_data == &usb_generic_driver_data)) |
| return 0; |
| |
| intf = to_usb_interface(dev); |
| driver = to_usb_driver(dev->driver); |
| |
| if (driver->resume) |
| return driver->resume(intf); |
| return 0; |
| } |
| |
| struct bus_type usb_bus_type = { |
| .name = "usb", |
| .match = usb_device_match, |
| .hotplug = usb_hotplug, |
| .suspend = usb_device_suspend, |
| .resume = usb_device_resume, |
| }; |
| |
| #ifndef MODULE |
| |
| static int __init usb_setup_disable(char *str) |
| { |
| nousb = 1; |
| return 1; |
| } |
| |
| /* format to disable USB on kernel command line is: nousb */ |
| __setup("nousb", usb_setup_disable); |
| |
| #endif |
| |
| /* |
| * for external read access to <nousb> |
| */ |
| int usb_disabled(void) |
| { |
| return nousb; |
| } |
| |
| /* |
| * Init |
| */ |
| /*static*/ int __init usb_init(void) |
| { |
| if (nousb) { |
| info("USB support disabled\n"); |
| return 0; |
| } |
| |
| bus_register(&usb_bus_type); |
| usb_host_init(); |
| usb_major_init(); |
| usbfs_init(); |
| usb_hub_init(); |
| |
| driver_register(&usb_generic_driver); |
| |
| return 0; |
| } |
| |
| /* |
| * Cleanup |
| */ |
| /*static*/ void __exit usb_exit(void) |
| { |
| /* This will matter if shutdown/reboot does exitcalls. */ |
| if (nousb) |
| return; |
| |
| driver_unregister(&usb_generic_driver); |
| // usb_major_cleanup(); |
| // usbfs_cleanup(); |
| // usb_hub_cleanup(); |
| // usb_host_cleanup(); |
| // bus_unregister(&usb_bus_type); |
| } |
| |
| subsys_initcall(usb_init); |
| module_exit(usb_exit); |
| |
| /* |
| * USB may be built into the kernel or be built as modules. |
| * These symbols are exported for device (or host controller) |
| * driver modules to use. |
| */ |
| EXPORT_SYMBOL(usb_epnum_to_ep_desc); |
| |
| EXPORT_SYMBOL(usb_register); |
| EXPORT_SYMBOL(usb_deregister); |
| EXPORT_SYMBOL(usb_disabled); |
| |
| EXPORT_SYMBOL(usb_alloc_dev); |
| EXPORT_SYMBOL(usb_put_dev); |
| EXPORT_SYMBOL(usb_get_dev); |
| EXPORT_SYMBOL(usb_hub_tt_clear_buffer); |
| |
| EXPORT_SYMBOL(usb_driver_claim_interface); |
| EXPORT_SYMBOL(usb_interface_claimed); |
| EXPORT_SYMBOL(usb_driver_release_interface); |
| EXPORT_SYMBOL(usb_match_id); |
| EXPORT_SYMBOL(usb_find_interface); |
| EXPORT_SYMBOL(usb_ifnum_to_if); |
| |
| EXPORT_SYMBOL(usb_reset_device); |
| EXPORT_SYMBOL(usb_disconnect); |
| |
| EXPORT_SYMBOL(__usb_get_extra_descriptor); |
| |
| EXPORT_SYMBOL(usb_find_device); |
| EXPORT_SYMBOL(usb_get_current_frame_number); |
| |
| EXPORT_SYMBOL (usb_buffer_alloc); |
| EXPORT_SYMBOL (usb_buffer_free); |
| |
| EXPORT_SYMBOL (usb_buffer_map); |
| EXPORT_SYMBOL (usb_buffer_dmasync); |
| EXPORT_SYMBOL (usb_buffer_unmap); |
| |
| EXPORT_SYMBOL (usb_buffer_map_sg); |
| EXPORT_SYMBOL (usb_buffer_dmasync_sg); |
| EXPORT_SYMBOL (usb_buffer_unmap_sg); |
| |
| MODULE_LICENSE("GPL"); |
| /* |
| * drivers/usb/usb.c |
| * |
| * (C) Copyright Linus Torvalds 1999 |
| * (C) Copyright Johannes Erdfelt 1999-2001 |
| * (C) Copyright Andreas Gal 1999 |
| * (C) Copyright Gregory P. Smith 1999 |
| * (C) Copyright Deti Fliegl 1999 (new USB architecture) |
| * (C) Copyright Randy Dunlap 2000 |
| * (C) Copyright David Brownell 2000-2001 (kernel hotplug, usb_device_id, |
| more docs, etc) |
| * (C) Copyright Yggdrasil Computing, Inc. 2000 |
| * (usb_device_id matching changes by Adam J. Richter) |
| * (C) Copyright Greg Kroah-Hartman 2002-2003 |
| * |
| * NOTE! This is not actually a driver at all, rather this is |
| * just a collection of helper routines that implement the |
| * generic USB things that the real drivers can use.. |
| * |
| * Think of this as a "USB library" rather than anything else. |
| * It should be considered a slave, with no callbacks. Callbacks |
| * are evil. |
| */ |
| |
| #include <linuxcomp.h> |
| |
| #include <linux/config.h> |
| |
| #ifdef CONFIG_USB_DEBUG |
| #define DEBUG |
| #else |
| #undef DEBUG |
| #endif |
| |
| #include <linux/module.h> |
| #include <linux/string.h> |
| #include <linux/bitops.h> |
| #include <linux/slab.h> |
| #include <linux/interrupt.h> /* for in_interrupt() */ |
| #include <linux/kmod.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/errno.h> |
| #include <linux/smp_lock.h> |
| #include <linux/usb.h> |
| |
| #include <asm/io.h> |
| #include <asm/scatterlist.h> |
| #include <linux/mm.h> |
| #include <linux/dma-mapping.h> |
| |
| #include "hcd.h" |
| #include "usb.h" |
| |
| extern int usb_hub_init(void); |
| extern void usb_hub_cleanup(void); |
| extern int usb_major_init(void); |
| extern void usb_major_cleanup(void); |
| extern int usb_host_init(void); |
| extern void usb_host_cleanup(void); |
| |
| |
| int nousb; /* Disable USB when built into kernel image */ |
| /* Not honored on modular build */ |
| |
| |
| static int generic_probe (struct device *dev) |
| { |
| return 0; |
| } |
| static int generic_remove (struct device *dev) |
| { |
| return 0; |
| } |
| |
| static struct device_driver usb_generic_driver = { |
| .name = "usb", |
| .bus = &usb_bus_type, |
| .probe = generic_probe, |
| .remove = generic_remove, |
| }; |
| |
| static int usb_generic_driver_data; |
| |
| /* needs to be called with BKL held */ |
| int usb_probe_interface(struct device *dev) |
| { |
| struct usb_interface * intf = to_usb_interface(dev); |
| struct usb_driver * driver = to_usb_driver(dev->driver); |
| const struct usb_device_id *id; |
| int error = -ENODEV; |
| |
| dev_dbg(dev, "%s\n", __FUNCTION__); |
| |
| if (!driver->probe) |
| return error; |
| |
| /* driver claim() doesn't yet affect dev->driver... */ |
| if (intf->driver) |
| return error; |
| |
| id = usb_match_id (intf, driver->id_table); |
| if (id) { |
| dev_dbg (dev, "%s - got id\n", __FUNCTION__); |
| error = driver->probe (intf, id); |
| } |
| if (!error) |
| intf->driver = driver; |
| |
| return error; |
| } |
| |
| int usb_unbind_interface(struct device *dev) |
| { |
| struct usb_interface *intf = to_usb_interface(dev); |
| struct usb_driver *driver = intf->driver; |
| |
| /* release all urbs for this interface */ |
| usb_disable_interface(interface_to_usbdev(intf), intf); |
| |
| if (driver && driver->disconnect) |
| driver->disconnect(intf); |
| |
| /* reset other interface state */ |
| usb_set_interface(interface_to_usbdev(intf), |
| intf->altsetting[0].desc.bInterfaceNumber, |
| 0); |
| usb_set_intfdata(intf, NULL); |
| intf->driver = NULL; |
| |
| return 0; |
| } |
| |
| /** |
| * usb_register - register a USB driver |
| * @new_driver: USB operations for the driver |
| * |
| * Registers a USB driver with the USB core. The list of unattached |
| * interfaces will be rescanned whenever a new driver is added, allowing |
| * the new driver to attach to any recognized devices. |
| * Returns a negative error code on failure and 0 on success. |
| * |
| * NOTE: if you want your driver to use the USB major number, you must call |
| * usb_register_dev() to enable that functionality. This function no longer |
| * takes care of that. |
| */ |
| int usb_register(struct usb_driver *new_driver) |
| { |
| int retval = 0; |
| |
| if (nousb) |
| return -ENODEV; |
| |
| new_driver->driver.name = (char *)new_driver->name; |
| new_driver->driver.bus = &usb_bus_type; |
| new_driver->driver.probe = usb_probe_interface; |
| new_driver->driver.remove = usb_unbind_interface; |
| |
| init_MUTEX(&new_driver->serialize); |
| |
| retval = driver_register(&new_driver->driver); |
| |
| if (!retval) { |
| info("registered new driver %s", new_driver->name); |
| usbfs_update_special(); |
| } else { |
| err("problem %d when registering driver %s", |
| retval, new_driver->name); |
| } |
| |
| return retval; |
| } |
| |
| /** |
| * usb_deregister - unregister a USB driver |
| * @driver: USB operations of the driver to unregister |
| * Context: !in_interrupt (), must be called with BKL held |
| * |
| * Unlinks the specified driver from the internal USB driver list. |
| * |
| * NOTE: If you called usb_register_dev(), you still need to call |
| * usb_deregister_dev() to clean up your driver's allocated minor numbers, |
| * this * call will no longer do it for you. |
| */ |
| void usb_deregister(struct usb_driver *driver) |
| { |
| info("deregistering driver %s", driver->name); |
| |
| driver_unregister (&driver->driver); |
| |
| usbfs_update_special(); |
| } |
| |
| /** |
| * usb_ifnum_to_if - get the interface object with a given interface number (usbcore-internal) |
| * @dev: the device whose current configuration is considered |
| * @ifnum: the desired interface |
| * |
| * This walks the device descriptor for the currently active configuration |
| * and returns a pointer to the interface with that particular interface |
| * number, or null. |
| * |
| * Note that configuration descriptors are not required to assign interface |
| * numbers sequentially, so that it would be incorrect to assume that |
| * the first interface in that descriptor corresponds to interface zero. |
| * This routine helps device drivers avoid such mistakes. |
| * However, you should make sure that you do the right thing with any |
| * alternate settings available for this interfaces. |
| */ |
| struct usb_interface *usb_ifnum_to_if(struct usb_device *dev, unsigned ifnum) |
| { |
| int i; |
| |
| for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) |
| if (dev->actconfig->interface[i]->altsetting[0] |
| .desc.bInterfaceNumber == ifnum) |
| return dev->actconfig->interface[i]; |
| |
| return NULL; |
| } |
| |
| /** |
| * usb_epnum_to_ep_desc - get the endpoint object with a given endpoint number |
| * @dev: the device whose current configuration+altsettings is considered |
| * @epnum: the desired endpoint, masked with USB_DIR_IN as appropriate. |
| * |
| * This walks the device descriptor for the currently active configuration, |
| * and returns a pointer to the endpoint with that particular endpoint |
| * number, or null. |
| * |
| * Note that interface descriptors are not required to list endpoint |
| * numbers in any standardized order, so that it would be wrong to |
| * assume that ep2in precedes either ep5in, ep2out, or even ep1out. |
| * This routine helps device drivers avoid such mistakes. |
| */ |
| struct usb_endpoint_descriptor * |
| usb_epnum_to_ep_desc(struct usb_device *dev, unsigned epnum) |
| { |
| int i, k; |
| |
| for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { |
| struct usb_interface *intf; |
| struct usb_host_interface *alt; |
| |
| /* only endpoints in current altseting are active */ |
| intf = dev->actconfig->interface[i]; |
| alt = intf->altsetting + intf->act_altsetting; |
| |
| for (k = 0; k < alt->desc.bNumEndpoints; k++) |
| if (epnum == alt->endpoint[k].desc.bEndpointAddress) |
| return &alt->endpoint[k].desc; |
| } |
| |
| return NULL; |
| } |
| |
| /** |
| * usb_driver_claim_interface - bind a driver to an interface |
| * @driver: the driver to be bound |
| * @iface: the interface to which it will be bound |
| * @priv: driver data associated with that interface |
| * |
| * This is used by usb device drivers that need to claim more than one |
| * interface on a device when probing (audio and acm are current examples). |
| * No device driver should directly modify internal usb_interface or |
| * usb_device structure members. |
| * |
| * Few drivers should need to use this routine, since the most natural |
| * way to bind to an interface is to return the private data from |
| * the driver's probe() method. |
| */ |
| int usb_driver_claim_interface(struct usb_driver *driver, struct usb_interface *iface, void* priv) |
| { |
| if (!iface || !driver) |
| return -EINVAL; |
| |
| if (iface->driver) |
| return -EBUSY; |
| |
| /* FIXME should device_bind_driver() */ |
| iface->driver = driver; |
| usb_set_intfdata(iface, priv); |
| return 0; |
| } |
| |
| /** |
| * usb_interface_claimed - returns true iff an interface is claimed |
| * @iface: the interface being checked |
| * |
| * This should be used by drivers to check other interfaces to see if |
| * they are available or not. If another driver has claimed the interface, |
| * they may not claim it. Otherwise it's OK to claim it using |
| * usb_driver_claim_interface(). |
| * |
| * Returns true (nonzero) iff the interface is claimed, else false (zero). |
| */ |
| int usb_interface_claimed(struct usb_interface *iface) |
| { |
| if (!iface) |
| return 0; |
| |
| return (iface->driver != NULL); |
| } /* usb_interface_claimed() */ |
| |
| /** |
| * usb_driver_release_interface - unbind a driver from an interface |
| * @driver: the driver to be unbound |
| * @iface: the interface from which it will be unbound |
| * |
| * In addition to unbinding the driver, this re-initializes the interface |
| * by selecting altsetting 0, the default alternate setting. |
| * |
| * This can be used by drivers to release an interface without waiting |
| * for their disconnect() methods to be called. |
| * |
| * When the USB subsystem disconnect()s a driver from some interface, |
| * it automatically invokes this method for that interface. That |
| * means that even drivers that used usb_driver_claim_interface() |
| * usually won't need to call this. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| */ |
| void usb_driver_release_interface(struct usb_driver *driver, struct usb_interface *iface) |
| { |
| /* this should never happen, don't release something that's not ours */ |
| if (!iface || !iface->driver || iface->driver != driver) |
| return; |
| |
| if (iface->dev.driver) { |
| /* FIXME should be the ONLY case here */ |
| device_release_driver(&iface->dev); |
| return; |
| } |
| |
| usb_set_interface(interface_to_usbdev(iface), |
| iface->altsetting[0].desc.bInterfaceNumber, |
| 0); |
| usb_set_intfdata(iface, NULL); |
| iface->driver = NULL; |
| } |
| |
| /** |
| * usb_match_id - find first usb_device_id matching device or interface |
| * @interface: the interface of interest |
| * @id: array of usb_device_id structures, terminated by zero entry |
| * |
| * usb_match_id searches an array of usb_device_id's and returns |
| * the first one matching the device or interface, or null. |
| * This is used when binding (or rebinding) a driver to an interface. |
| * Most USB device drivers will use this indirectly, through the usb core, |
| * but some layered driver frameworks use it directly. |
| * These device tables are exported with MODULE_DEVICE_TABLE, through |
| * modutils and "modules.usbmap", to support the driver loading |
| * functionality of USB hotplugging. |
| * |
| * What Matches: |
| * |
| * The "match_flags" element in a usb_device_id controls which |
| * members are used. If the corresponding bit is set, the |
| * value in the device_id must match its corresponding member |
| * in the device or interface descriptor, or else the device_id |
| * does not match. |
| * |
| * "driver_info" is normally used only by device drivers, |
| * but you can create a wildcard "matches anything" usb_device_id |
| * as a driver's "modules.usbmap" entry if you provide an id with |
| * only a nonzero "driver_info" field. If you do this, the USB device |
| * driver's probe() routine should use additional intelligence to |
| * decide whether to bind to the specified interface. |
| * |
| * What Makes Good usb_device_id Tables: |
| * |
| * The match algorithm is very simple, so that intelligence in |
| * driver selection must come from smart driver id records. |
| * Unless you have good reasons to use another selection policy, |
| * provide match elements only in related groups, and order match |
| * specifiers from specific to general. Use the macros provided |
| * for that purpose if you can. |
| * |
| * The most specific match specifiers use device descriptor |
| * data. These are commonly used with product-specific matches; |
| * the USB_DEVICE macro lets you provide vendor and product IDs, |
| * and you can also match against ranges of product revisions. |
| * These are widely used for devices with application or vendor |
| * specific bDeviceClass values. |
| * |
| * Matches based on device class/subclass/protocol specifications |
| * are slightly more general; use the USB_DEVICE_INFO macro, or |
| * its siblings. These are used with single-function devices |
| * where bDeviceClass doesn't specify that each interface has |
| * its own class. |
| * |
| * Matches based on interface class/subclass/protocol are the |
| * most general; they let drivers bind to any interface on a |
| * multiple-function device. Use the USB_INTERFACE_INFO |
| * macro, or its siblings, to match class-per-interface style |
| * devices (as recorded in bDeviceClass). |
| * |
| * Within those groups, remember that not all combinations are |
| * meaningful. For example, don't give a product version range |
| * without vendor and product IDs; or specify a protocol without |
| * its associated class and subclass. |
| */ |
| const struct usb_device_id * |
| usb_match_id(struct usb_interface *interface, const struct usb_device_id *id) |
| { |
| struct usb_host_interface *intf; |
| struct usb_device *dev; |
| |
| /* proc_connectinfo in devio.c may call us with id == NULL. */ |
| if (id == NULL) |
| return NULL; |
| |
| intf = &interface->altsetting [interface->act_altsetting]; |
| dev = interface_to_usbdev(interface); |
| |
| /* It is important to check that id->driver_info is nonzero, |
| since an entry that is all zeroes except for a nonzero |
| id->driver_info is the way to create an entry that |
| indicates that the driver want to examine every |
| device and interface. */ |
| for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass || |
| id->driver_info; id++) { |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
| id->idVendor != dev->descriptor.idVendor) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && |
| id->idProduct != dev->descriptor.idProduct) |
| continue; |
| |
| /* No need to test id->bcdDevice_lo != 0, since 0 is never |
| greater than any unsigned number. */ |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && |
| (id->bcdDevice_lo > dev->descriptor.bcdDevice)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && |
| (id->bcdDevice_hi < dev->descriptor.bcdDevice)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && |
| (id->bDeviceClass != dev->descriptor.bDeviceClass)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && |
| (id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && |
| (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && |
| (id->bInterfaceClass != intf->desc.bInterfaceClass)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && |
| (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) |
| continue; |
| |
| if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && |
| (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) |
| continue; |
| |
| return id; |
| } |
| |
| return NULL; |
| } |
| |
| /** |
| * usb_find_interface - find usb_interface pointer for driver and device |
| * @drv: the driver whose current configuration is considered |
| * @minor: the minor number of the desired device |
| * |
| * This walks the driver device list and returns a pointer to the interface |
| * with the matching minor. Note, this only works for devices that share the |
| * USB major number. |
| */ |
| struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) |
| { |
| struct list_head *entry; |
| struct device *dev; |
| struct usb_interface *intf; |
| |
| list_for_each(entry, &drv->driver.devices) { |
| dev = container_of(entry, struct device, driver_list); |
| |
| /* can't look at usb devices, only interfaces */ |
| if (dev->driver == &usb_generic_driver) |
| continue; |
| |
| intf = to_usb_interface(dev); |
| if (intf->minor == -1) |
| continue; |
| if (intf->minor == minor) |
| return intf; |
| } |
| |
| /* no device found that matches */ |
| return NULL; |
| } |
| |
| static int usb_device_match (struct device *dev, struct device_driver *drv) |
| { |
| struct usb_interface *intf; |
| struct usb_driver *usb_drv; |
| const struct usb_device_id *id; |
| |
| /* check for generic driver, which we don't match any device with */ |
| if (drv == &usb_generic_driver) |
| return 0; |
| |
| intf = to_usb_interface(dev); |
| |
| usb_drv = to_usb_driver(drv); |
| id = usb_drv->id_table; |
| |
| id = usb_match_id (intf, usb_drv->id_table); |
| if (id) |
| return 1; |
| |
| return 0; |
| } |
| |
| |
| #ifdef CONFIG_HOTPLUG |
| |
| /* |
| * USB hotplugging invokes what /proc/sys/kernel/hotplug says |
| * (normally /sbin/hotplug) when USB devices get added or removed. |
| * |
| * This invokes a user mode policy agent, typically helping to load driver |
| * or other modules, configure the device, and more. Drivers can provide |
| * a MODULE_DEVICE_TABLE to help with module loading subtasks. |
| * |
| * We're called either from khubd (the typical case) or from root hub |
| * (init, kapmd, modprobe, rmmod, etc), but the agents need to handle |
| * delays in event delivery. Use sysfs (and DEVPATH) to make sure the |
| * device (and this configuration!) are still present. |
| */ |
| static int usb_hotplug (struct device *dev, char **envp, int num_envp, |
| char *buffer, int buffer_size) |
| { |
| struct usb_interface *intf; |
| struct usb_device *usb_dev; |
| char *scratch; |
| int i = 0; |
| int length = 0; |
| |
| dbg ("%s", __FUNCTION__); |
| |
| if (!dev) |
| return -ENODEV; |
| |
| /* Must check driver_data here, as on remove driver is always NULL */ |
| if ((dev->driver == &usb_generic_driver) || |
| (dev->driver_data == &usb_generic_driver_data)) |
| return 0; |
| |
| intf = to_usb_interface(dev); |
| usb_dev = interface_to_usbdev (intf); |
| |
| if (usb_dev->devnum < 0) { |
| dbg ("device already deleted ??"); |
| return -ENODEV; |
| } |
| if (!usb_dev->bus) { |
| dbg ("bus already removed?"); |
| return -ENODEV; |
| } |
| |
| scratch = buffer; |
| |
| #ifdef CONFIG_USB_DEVICEFS |
| /* If this is available, userspace programs can directly read |
| * all the device descriptors we don't tell them about. Or |
| * even act as usermode drivers. |
| * |
| * FIXME reduce hardwired intelligence here |
| */ |
| envp [i++] = scratch; |
| length += snprintf26 (scratch, buffer_size - length, |
| "DEVICE=/proc/bus/usb/%03d/%03d", |
| usb_dev->bus->busnum, usb_dev->devnum); |
| if ((buffer_size - length <= 0) || (i >= num_envp)) |
| return -ENOMEM; |
| ++length; |
| scratch += length; |
| #endif |
| |
| /* per-device configurations are common */ |
| envp [i++] = scratch; |
| length += snprintf26 (scratch, buffer_size - length, "PRODUCT=%x/%x/%x", |
| usb_dev->descriptor.idVendor, |
| usb_dev->descriptor.idProduct, |
| usb_dev->descriptor.bcdDevice); |
| if ((buffer_size - length <= 0) || (i >= num_envp)) |
| return -ENOMEM; |
| ++length; |
| scratch += length; |
| |
| /* class-based driver binding models */ |
| envp [i++] = scratch; |
| length += snprintf26 (scratch, buffer_size - length, "TYPE=%d/%d/%d", |
| usb_dev->descriptor.bDeviceClass, |
| usb_dev->descriptor.bDeviceSubClass, |
| usb_dev->descriptor.bDeviceProtocol); |
| if ((buffer_size - length <= 0) || (i >= num_envp)) |
| return -ENOMEM; |
| ++length; |
| scratch += length; |
| |
| if (usb_dev->descriptor.bDeviceClass == 0) { |
| int alt = intf->act_altsetting; |
| |
| /* 2.4 only exposed interface zero. in 2.5, hotplug |
| * agents are called for all interfaces, and can use |
| * $DEVPATH/bInterfaceNumber if necessary. |
| */ |
| envp [i++] = scratch; |
| length += snprintf26 (scratch, buffer_size - length, |
| "INTERFACE=%d/%d/%d", |
| intf->altsetting[alt].desc.bInterfaceClass, |
| intf->altsetting[alt].desc.bInterfaceSubClass, |
| intf->altsetting[alt].desc.bInterfaceProtocol); |
| if ((buffer_size - length <= 0) || (i >= num_envp)) |
| return -ENOMEM; |
| ++length; |
| scratch += length; |
| |
| } |
| envp [i++] = 0; |
| |
| return 0; |
| } |
| |
| #else |
| |
| static int usb_hotplug (struct device *dev, char **envp, |
| int num_envp, char *buffer, int buffer_size) |
| { |
| return -ENODEV; |
| } |
| |
| #endif /* CONFIG_HOTPLUG */ |
| |
| /** |
| * usb_release_dev - free a usb device structure when all users of it are finished. |
| * @dev: device that's been disconnected |
| * |
| * Will be called only by the device core when all users of this usb device are |
| * done. |
| */ |
| static void usb_release_dev(struct device *dev) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| |
| if (udev->bus && udev->bus->op && udev->bus->op->deallocate) |
| udev->bus->op->deallocate(udev); |
| usb_destroy_configuration(udev); |
| usb_bus_put(udev->bus); |
| kfree (udev); |
| } |
| |
| /** |
| * usb_alloc_dev - allocate a usb device structure (usbcore-internal) |
| * @parent: hub to which device is connected |
| * @bus: bus used to access the device |
| * Context: !in_interrupt () |
| * |
| * Only hub drivers (including virtual root hub drivers for host |
| * controllers) should ever call this. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| */ |
| struct usb_device *usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus) |
| { |
| struct usb_device *dev; |
| |
| dev = kmalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return NULL; |
| |
| memset(dev, 0, sizeof(*dev)); |
| |
| bus = usb_bus_get(bus); |
| if (!bus) { |
| kfree(dev); |
| return NULL; |
| } |
| |
| device_initialize(&dev->dev); |
| dev->dev.release = usb_release_dev; |
| dev->state = USB_STATE_ATTACHED; |
| |
| if (!parent) |
| dev->devpath [0] = '0'; |
| dev->bus = bus; |
| dev->parent = parent; |
| INIT_LIST_HEAD(&dev->filelist); |
| |
| init_MUTEX(&dev->serialize); |
| |
| if (dev->bus->op->allocate) |
| dev->bus->op->allocate(dev); |
| |
| return dev; |
| } |
| |
| /** |
| * usb_get_dev - increments the reference count of the usb device structure |
| * @dev: the device being referenced |
| * |
| * Each live reference to a device should be refcounted. |
| * |
| * Drivers for USB interfaces should normally record such references in |
| * their probe() methods, when they bind to an interface, and release |
| * them by calling usb_put_dev(), in their disconnect() methods. |
| * |
| * A pointer to the device with the incremented reference counter is returned. |
| */ |
| struct usb_device *usb_get_dev (struct usb_device *dev) |
| { |
| struct device *tmp; |
| |
| if (!dev) |
| return NULL; |
| |
| tmp = get_device(&dev->dev); |
| if (tmp) |
| return to_usb_device(tmp); |
| else |
| return NULL; |
| } |
| |
| /** |
| * usb_put_dev - release a use of the usb device structure |
| * @dev: device that's been disconnected |
| * |
| * Must be called when a user of a device is finished with it. When the last |
| * user of the device calls this function, the memory of the device is freed. |
| */ |
| void usb_put_dev(struct usb_device *dev) |
| { |
| if (dev) |
| put_device(&dev->dev); |
| } |
| |
| static struct usb_device *match_device(struct usb_device *dev, |
| u16 vendor_id, u16 product_id) |
| { |
| struct usb_device *ret_dev = NULL; |
| int child; |
| |
| dbg("looking at vendor %d, product %d", |
| dev->descriptor.idVendor, |
| dev->descriptor.idProduct); |
| |
| /* see if this device matches */ |
| if ((dev->descriptor.idVendor == vendor_id) && |
| (dev->descriptor.idProduct == product_id)) { |
| dbg ("found the device!"); |
| ret_dev = usb_get_dev(dev); |
| goto exit; |
| } |
| |
| /* look through all of the children of this device */ |
| for (child = 0; child < dev->maxchild; ++child) { |
| if (dev->children[child]) { |
| ret_dev = match_device(dev->children[child], |
| vendor_id, product_id); |
| if (ret_dev) |
| goto exit; |
| } |
| } |
| exit: |
| return ret_dev; |
| } |
| |
| /** |
| * usb_find_device - find a specific usb device in the system |
| * @vendor_id: the vendor id of the device to find |
| * @product_id: the product id of the device to find |
| * |
| * Returns a pointer to a struct usb_device if such a specified usb |
| * device is present in the system currently. The usage count of the |
| * device will be incremented if a device is found. Make sure to call |
| * usb_put_dev() when the caller is finished with the device. |
| * |
| * If a device with the specified vendor and product id is not found, |
| * NULL is returned. |
| */ |
| struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) |
| { |
| struct list_head *buslist; |
| struct usb_bus *bus; |
| struct usb_device *dev = NULL; |
| |
| down(&usb_bus_list_lock); |
| for (buslist = usb_bus_list.next; |
| buslist != &usb_bus_list; |
| buslist = buslist->next) { |
| bus = container_of(buslist, struct usb_bus, bus_list); |
| dev = match_device(bus->root_hub, vendor_id, product_id); |
| if (dev) |
| goto exit; |
| } |
| exit: |
| up(&usb_bus_list_lock); |
| return dev; |
| } |
| |
| /** |
| * usb_get_current_frame_number - return current bus frame number |
| * @dev: the device whose bus is being queried |
| * |
| * Returns the current frame number for the USB host controller |
| * used with the given USB device. This can be used when scheduling |
| * isochronous requests. |
| * |
| * Note that different kinds of host controller have different |
| * "scheduling horizons". While one type might support scheduling only |
| * 32 frames into the future, others could support scheduling up to |
| * 1024 frames into the future. |
| */ |
| int usb_get_current_frame_number(struct usb_device *dev) |
| { |
| return dev->bus->op->get_frame_number (dev); |
| } |
| |
| /*-------------------------------------------------------------------*/ |
| /* |
| * __usb_get_extra_descriptor() finds a descriptor of specific type in the |
| * extra field of the interface and endpoint descriptor structs. |
| */ |
| |
| int __usb_get_extra_descriptor(char *buffer, unsigned size, unsigned char type, void **ptr) |
| { |
| struct usb_descriptor_header *header; |
| |
| while (size >= sizeof(struct usb_descriptor_header)) { |
| header = (struct usb_descriptor_header *)buffer; |
| |
| if (header->bLength < 2) { |
| err("invalid descriptor length of %d", header->bLength); |
| return -1; |
| } |
| |
| if (header->bDescriptorType == type) { |
| *ptr = header; |
| return 0; |
| } |
| |
| buffer += header->bLength; |
| size -= header->bLength; |
| } |
| return -1; |
| } |
| |
| /** |
| * usb_disconnect - disconnect a device (usbcore-internal) |
| * @pdev: pointer to device being disconnected |
| * Context: !in_interrupt () |
| * |
| * Something got disconnected. Get rid of it, and all of its children. |
| * |
| * Only hub drivers (including virtual root hub drivers for host |
| * controllers) should ever call this. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| */ |
| void usb_disconnect(struct usb_device **pdev) |
| { |
| struct usb_device *dev = *pdev; |
| struct usb_bus *bus; |
| struct usb_operations *ops; |
| int i; |
| |
| might_sleep (); |
| |
| if (!dev) { |
| pr_debug ("%s nodev\n", __FUNCTION__); |
| return; |
| } |
| bus = dev->bus; |
| if (!bus) { |
| pr_debug ("%s nobus\n", __FUNCTION__); |
| return; |
| } |
| ops = bus->op; |
| |
| *pdev = NULL; |
| |
| /* mark the device as inactive, so any further urb submissions for |
| * this device will fail. |
| */ |
| dev->state = USB_STATE_NOTATTACHED; |
| down(&dev->serialize); |
| |
| dev_info (&dev->dev, "USB disconnect, address %d\n", dev->devnum); |
| |
| /* Free up all the children before we remove this device */ |
| for (i = 0; i < USB_MAXCHILDREN; i++) { |
| struct usb_device **child = dev->children + i; |
| if (*child) |
| usb_disconnect(child); |
| } |
| |
| /* deallocate hcd/hardware state ... nuking all pending urbs and |
| * cleaning up all state associated with the current configuration |
| */ |
| usb_disable_device(dev, 0); |
| |
| dev_dbg (&dev->dev, "unregistering device\n"); |
| /* Free the device number and remove the /proc/bus/usb entry */ |
| if (dev->devnum > 0) { |
| clear_bit(dev->devnum, dev->bus->devmap.devicemap); |
| usbfs_remove_device(dev); |
| } |
| up(&dev->serialize); |
| device_unregister(&dev->dev); |
| } |
| |
| /** |
| * usb_choose_address - pick device address (usbcore-internal) |
| * @dev: newly detected device (in DEFAULT state) |
| * |
| * Picks a device address. It's up to the hub (or root hub) driver |
| * to handle and manage enumeration, starting from the DEFAULT state. |
| * Only hub drivers (but not virtual root hub drivers for host |
| * controllers) should ever call this. |
| */ |
| void usb_choose_address(struct usb_device *dev) |
| { |
| int devnum; |
| // FIXME needs locking for SMP!! |
| /* why? this is called only from the hub thread, |
| * which hopefully doesn't run on multiple CPU's simultaneously 8-) |
| */ |
| |
| /* Try to allocate the next devnum beginning at bus->devnum_next. */ |
| devnum = find_next_zero_bit(dev->bus->devmap.devicemap, 128, dev->bus->devnum_next); |
| if (devnum >= 128) |
| devnum = find_next_zero_bit(dev->bus->devmap.devicemap, 128, 1); |
| |
| dev->bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); |
| |
| if (devnum < 128) { |
| set_bit(devnum, dev->bus->devmap.devicemap); |
| dev->devnum = devnum; |
| } |
| } |
| |
| |
| // hub-only!! ... and only exported for reset/reinit path. |
| // otherwise used internally, for usb_new_device() |
| int usb_set_address(struct usb_device *dev) |
| { |
| int retval; |
| |
| if (dev->devnum == 0) |
| return -EINVAL; |
| if (dev->state != USB_STATE_DEFAULT && dev->state != USB_STATE_ADDRESS) |
| return -EINVAL; |
| retval = usb_control_msg(dev, usb_snddefctrl(dev), USB_REQ_SET_ADDRESS, |
| 0, dev->devnum, 0, NULL, 0, HZ * USB_CTRL_SET_TIMEOUT); |
| if (retval == 0) |
| dev->state = USB_STATE_ADDRESS; |
| return retval; |
| } |
| |
| /* |
| * By the time we get here, we chose a new device address |
| * and is in the default state. We need to identify the thing and |
| * get the ball rolling.. |
| * |
| * Returns 0 for success, != 0 for error. |
| * |
| * This call is synchronous, and may not be used in an interrupt context. |
| * |
| * Only the hub driver should ever call this; root hub registration |
| * uses it only indirectly. |
| */ |
| #define NEW_DEVICE_RETRYS 2 |
| #define SET_ADDRESS_RETRYS 2 |
| int usb_new_device(struct usb_device *dev, struct device *parent) |
| { |
| int err = -EINVAL; |
| int i; |
| int j; |
| int config; |
| |
| |
| /* |
| * Set the driver for the usb device to point to the "generic" driver. |
| * This prevents the main usb device from being sent to the usb bus |
| * probe function. Yes, it's a hack, but a nice one :) |
| * |
| * Do it asap, so more driver model stuff (like the device.h message |
| * utilities) can be used in hcd submit/unlink code paths. |
| */ |
| usb_generic_driver.bus = &usb_bus_type; |
| dev->dev.parent = parent; |
| dev->dev.driver = &usb_generic_driver; |
| dev->dev.bus = &usb_bus_type; |
| dev->dev.driver_data = &usb_generic_driver_data; |
| if (dev->dev.bus_id[0] == 0) |
| sprintf26 (&dev->dev.bus_id[0], "%d-%s", |
| dev->bus->busnum, dev->devpath); |
| |
| /* dma masks come from the controller; readonly, except to hcd */ |
| dev->dev.dma_mask = parent->dma_mask; |
| |
| /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
| * it's fixed size except for full speed devices. |
| */ |
| switch (dev->speed) { |
| case USB_SPEED_HIGH: /* fixed at 64 */ |
| i = 64; |
| break; |
| case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ |
| /* to determine the ep0 maxpacket size, read the first 8 |
| * bytes from the device descriptor to get bMaxPacketSize0; |
| * then correct our initial (small) guess. |
| */ |
| // FALLTHROUGH |
| case USB_SPEED_LOW: /* fixed at 8 */ |
| i = 8; |
| break; |
| default: |
| goto fail; |
| } |
| dev->epmaxpacketin [0] = i; |
| dev->epmaxpacketout[0] = i; |
| |
| for (i = 0; i < NEW_DEVICE_RETRYS; ++i) { |
| for (j = 0; j < SET_ADDRESS_RETRYS; ++j) { |
| err = usb_set_address(dev); |
| if (err >= 0) |
| break; |
| wait_ms(200); |
| } |
| if (err < 0) { |
| dev_err(&dev->dev, |
| "device not accepting address %d, error %d\n", |
| dev->devnum, err); |
| goto fail; |
| } |
| |
| wait_ms(10); /* Let the SET_ADDRESS settle */ |
| /* high and low speed devices don't need this... */ |
| |
| err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, &dev->descriptor, 8); |
| if (err >= 8) |
| break; |
| wait_ms(100); |
| } |
| |
| if (err < 8) { |
| dev_err(&dev->dev, "device descriptor read/8, error %d\n", err); |
| goto fail; |
| } |
| if (dev->speed == USB_SPEED_FULL) { |
| usb_disable_endpoint(dev, 0); |
| usb_endpoint_running(dev, 0, 1); |
| usb_endpoint_running(dev, 0, 0); |
| dev->epmaxpacketin [0] = dev->descriptor.bMaxPacketSize0; |
| dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0; |
| } |
| |
| /* USB device state == addressed ... still not usable */ |
| |
| err = usb_get_device_descriptor(dev); |
| if (err < (signed)sizeof(dev->descriptor)) { |
| dev_err(&dev->dev, "device descriptor read/all, error %d\n", err); |
| goto fail; |
| } |
| |
| err = usb_get_configuration(dev); |
| if (err < 0) { |
| dev_err(&dev->dev, "can't read configurations, error %d\n", |
| err); |
| goto fail; |
| } |
| |
| /* Tell the world! */ |
| dev_dbg(&dev->dev, "new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", |
| dev->descriptor.iManufacturer, dev->descriptor.iProduct, dev->descriptor.iSerialNumber); |
| |
| #ifdef DEBUG |
| if (dev->descriptor.iProduct) |
| usb_show_string(dev, "Product", dev->descriptor.iProduct); |
| if (dev->descriptor.iManufacturer) |
| usb_show_string(dev, "Manufacturer", dev->descriptor.iManufacturer); |
| if (dev->descriptor.iSerialNumber) |
| usb_show_string(dev, "SerialNumber", dev->descriptor.iSerialNumber); |
| #endif |
| |
| /* put device-specific files into sysfs */ |
| err = device_add (&dev->dev); |
| if (err) { |
| dev_err(&dev->dev, "can't device_add, error %d\n", err); |
| goto fail; |
| } |
| usb_create_driverfs_dev_files (dev); |
| |
| /* choose and set the configuration. that registers the interfaces |
| * with the driver core, and lets usb device drivers bind to them. |
| * NOTE: should interact with hub power budgeting. |
| */ |
| config = dev->config[0].desc.bConfigurationValue; |
| if (dev->descriptor.bNumConfigurations != 1) { |
| for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { |
| /* heuristic: Linux is more likely to have class |
| * drivers, so avoid vendor-specific interfaces. |
| */ |
| if (dev->config[i].interface[0]->altsetting |
| ->desc.bInterfaceClass |
| == USB_CLASS_VENDOR_SPEC) |
| continue; |
| config = dev->config[i].desc.bConfigurationValue; |
| break; |
| } |
| dev_info(&dev->dev, |
| "configuration #%d chosen from %d choices\n", |
| config, |
| dev->descriptor.bNumConfigurations); |
| } |
| err = usb_set_configuration(dev, config); |
| |
| if (err) { |
| dev_err(&dev->dev, "can't set config #%d, error %d\n", |
| config, err); |
| device_del(&dev->dev); |
| goto fail; |
| } |
| |
| /* USB device state == configured ... usable */ |
| |
| /* add a /proc/bus/usb entry */ |
| usbfs_add_device(dev); |
| |
| return 0; |
| fail: |
| dev->state = USB_STATE_DEFAULT; |
| clear_bit(dev->devnum, dev->bus->devmap.devicemap); |
| dev->devnum = -1; |
| return err; |
| } |
| |
| /** |
| * usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP |
| * @dev: device the buffer will be used with |
| * @size: requested buffer size |
| * @mem_flags: affect whether allocation may block |
| * @dma: used to return DMA address of buffer |
| * |
| * Return value is either null (indicating no buffer could be allocated), or |
| * the cpu-space pointer to a buffer that may be used to perform DMA to the |
| * specified device. Such cpu-space buffers are returned along with the DMA |
| * address (through the pointer provided). |
| * |
| * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags |
| * to avoid behaviors like using "DMA bounce buffers", or tying down I/O |
| * mapping hardware for long idle periods. The implementation varies between |
| * platforms, depending on details of how DMA will work to this device. |
| * Using these buffers also helps prevent cacheline sharing problems on |
| * architectures where CPU caches are not DMA-coherent. |
| * |
| * When the buffer is no longer used, free it with usb_buffer_free(). |
| */ |
| void *usb_buffer_alloc ( |
| struct usb_device *dev, |
| size_t size, |
| int mem_flags, |
| dma_addr_t *dma |
| ) |
| { |
| if (!dev || !dev->bus || !dev->bus->op || !dev->bus->op->buffer_alloc) |
| return 0; |
| return dev->bus->op->buffer_alloc (dev->bus, size, mem_flags, dma); |
| } |
| |
| /** |
| * usb_buffer_free - free memory allocated with usb_buffer_alloc() |
| * @dev: device the buffer was used with |
| * @size: requested buffer size |
| * @addr: CPU address of buffer |
| * @dma: DMA address of buffer |
| * |
| * This reclaims an I/O buffer, letting it be reused. The memory must have |
| * been allocated using usb_buffer_alloc(), and the parameters must match |
| * those provided in that allocation request. |
| */ |
| void usb_buffer_free ( |
| struct usb_device *dev, |
| size_t size, |
| void *addr, |
| dma_addr_t dma |
| ) |
| { |
| if (!dev || !dev->bus || !dev->bus->op || !dev->bus->op->buffer_free) |
| return; |
| dev->bus->op->buffer_free (dev->bus, size, addr, dma); |
| } |
| |
| /** |
| * usb_buffer_map - create DMA mapping(s) for an urb |
| * @urb: urb whose transfer_buffer/setup_packet will be mapped |
| * |
| * Return value is either null (indicating no buffer could be mapped), or |
| * the parameter. URB_NO_TRANSFER_DMA_MAP and URB_NO_SETUP_DMA_MAP are |
| * added to urb->transfer_flags if the operation succeeds. If the device |
| * is connected to this system through a non-DMA controller, this operation |
| * always succeeds. |
| * |
| * This call would normally be used for an urb which is reused, perhaps |
| * as the target of a large periodic transfer, with usb_buffer_dmasync() |
| * calls to synchronize memory and dma state. |
| * |
| * Reverse the effect of this call with usb_buffer_unmap(). |
| */ |
| struct urb *usb_buffer_map (struct urb *urb) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!urb |
| || !urb->dev |
| || !(bus = urb->dev->bus) |
| || !(controller = bus->controller)) |
| return 0; |
| |
| if (controller->dma_mask) { |
| urb->transfer_dma = dma_map_single (controller, |
| urb->transfer_buffer, urb->transfer_buffer_length, |
| usb_pipein (urb->pipe) |
| ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| if (usb_pipecontrol (urb->pipe)) |
| urb->setup_dma = dma_map_single (controller, |
| urb->setup_packet, |
| sizeof (struct usb_ctrlrequest), |
| DMA_TO_DEVICE); |
| // FIXME generic api broken like pci, can't report errors |
| // if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; |
| } else |
| urb->transfer_dma = ~0; |
| urb->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP |
| | URB_NO_SETUP_DMA_MAP); |
| return urb; |
| } |
| |
| /** |
| * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s) |
| * @urb: urb whose transfer_buffer/setup_packet will be synchronized |
| */ |
| void usb_buffer_dmasync (struct urb *urb) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!urb |
| || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) |
| || !urb->dev |
| || !(bus = urb->dev->bus) |
| || !(controller = bus->controller)) |
| return; |
| |
| if (controller->dma_mask) { |
| dma_sync_single (controller, |
| urb->transfer_dma, urb->transfer_buffer_length, |
| usb_pipein (urb->pipe) |
| ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| if (usb_pipecontrol (urb->pipe)) |
| dma_sync_single (controller, |
| urb->setup_dma, |
| sizeof (struct usb_ctrlrequest), |
| DMA_TO_DEVICE); |
| } |
| } |
| |
| /** |
| * usb_buffer_unmap - free DMA mapping(s) for an urb |
| * @urb: urb whose transfer_buffer will be unmapped |
| * |
| * Reverses the effect of usb_buffer_map(). |
| */ |
| void usb_buffer_unmap (struct urb *urb) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!urb |
| || !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) |
| || !urb->dev |
| || !(bus = urb->dev->bus) |
| || !(controller = bus->controller)) |
| return; |
| |
| if (controller->dma_mask) { |
| dma_unmap_single (controller, |
| urb->transfer_dma, urb->transfer_buffer_length, |
| usb_pipein (urb->pipe) |
| ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| if (usb_pipecontrol (urb->pipe)) |
| dma_unmap_single (controller, |
| urb->setup_dma, |
| sizeof (struct usb_ctrlrequest), |
| DMA_TO_DEVICE); |
| } |
| urb->transfer_flags &= ~(URB_NO_TRANSFER_DMA_MAP |
| | URB_NO_SETUP_DMA_MAP); |
| } |
| |
| /** |
| * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint |
| * @dev: device to which the scatterlist will be mapped |
| * @pipe: endpoint defining the mapping direction |
| * @sg: the scatterlist to map |
| * @nents: the number of entries in the scatterlist |
| * |
| * Return value is either < 0 (indicating no buffers could be mapped), or |
| * the number of DMA mapping array entries in the scatterlist. |
| * |
| * The caller is responsible for placing the resulting DMA addresses from |
| * the scatterlist into URB transfer buffer pointers, and for setting the |
| * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs. |
| * |
| * Top I/O rates come from queuing URBs, instead of waiting for each one |
| * to complete before starting the next I/O. This is particularly easy |
| * to do with scatterlists. Just allocate and submit one URB for each DMA |
| * mapping entry returned, stopping on the first error or when all succeed. |
| * Better yet, use the usb_sg_*() calls, which do that (and more) for you. |
| * |
| * This call would normally be used when translating scatterlist requests, |
| * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it |
| * may be able to coalesce mappings for improved I/O efficiency. |
| * |
| * Reverse the effect of this call with usb_buffer_unmap_sg(). |
| */ |
| int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe, |
| struct scatterlist *sg, int nents) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!dev |
| || usb_pipecontrol (pipe) |
| || !(bus = dev->bus) |
| || !(controller = bus->controller) |
| || !controller->dma_mask) |
| return -1; |
| |
| // FIXME generic api broken like pci, can't report errors |
| return dma_map_sg (controller, sg, nents, |
| usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| } |
| |
| /** |
| * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s) |
| * @dev: device to which the scatterlist will be mapped |
| * @pipe: endpoint defining the mapping direction |
| * @sg: the scatterlist to synchronize |
| * @n_hw_ents: the positive return value from usb_buffer_map_sg |
| * |
| * Use this when you are re-using a scatterlist's data buffers for |
| * another USB request. |
| */ |
| void usb_buffer_dmasync_sg (struct usb_device *dev, unsigned pipe, |
| struct scatterlist *sg, int n_hw_ents) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!dev |
| || !(bus = dev->bus) |
| || !(controller = bus->controller) |
| || !controller->dma_mask) |
| return; |
| |
| dma_sync_sg (controller, sg, n_hw_ents, |
| usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| } |
| |
| /** |
| * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist |
| * @dev: device to which the scatterlist will be mapped |
| * @pipe: endpoint defining the mapping direction |
| * @sg: the scatterlist to unmap |
| * @n_hw_ents: the positive return value from usb_buffer_map_sg |
| * |
| * Reverses the effect of usb_buffer_map_sg(). |
| */ |
| void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe, |
| struct scatterlist *sg, int n_hw_ents) |
| { |
| struct usb_bus *bus; |
| struct device *controller; |
| |
| if (!dev |
| || !(bus = dev->bus) |
| || !(controller = bus->controller) |
| || !controller->dma_mask) |
| return; |
| |
| dma_unmap_sg (controller, sg, n_hw_ents, |
| usb_pipein (pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE); |
| } |
| |
| static int usb_device_suspend(struct device *dev, u32 state) |
| { |
| struct usb_interface *intf; |
| struct usb_driver *driver; |
| |
| if ((dev->driver == NULL) || |
| (dev->driver == &usb_generic_driver) || |
| (dev->driver_data == &usb_generic_driver_data)) |
| return 0; |
| |
| intf = to_usb_interface(dev); |
| driver = to_usb_driver(dev->driver); |
| |
| if (driver->suspend) |
| return driver->suspend(intf, state); |
| return 0; |
| } |
| |
| static int usb_device_resume(struct device *dev) |
| { |
| struct usb_interface *intf; |
| struct usb_driver *driver; |
| |
| if ((dev->driver == NULL) || |
| (dev->driver == &usb_generic_driver) || |
| (dev->driver_data == &usb_generic_driver_data)) |
| return 0; |
| |
| intf = to_usb_interface(dev); |
| driver = to_usb_driver(dev->driver); |
| |
| if (driver->resume) |
| return driver->resume(intf); |
| return 0; |
| } |
| |
| struct bus_type usb_bus_type = { |
| .name = "usb", |
| .match = usb_device_match, |
| .hotplug = usb_hotplug, |
| .suspend = usb_device_suspend, |
| .resume = usb_device_resume, |
| }; |
| |
| #ifndef MODULE |
| |
| static int __init usb_setup_disable(char *str) |
| { |
| nousb = 1; |
| return 1; |
| } |
| |
| /* format to disable USB on kernel command line is: nousb */ |
| __setup("nousb", usb_setup_disable); |
| |
| #endif |
| |
| /* |
| * for external read access to <nousb> |
| */ |
| int usb_disabled(void) |
| { |
| return nousb; |
| } |
| |
| /* |
| * Init |
| */ |
| /*static*/ int __init usb_init(void) |
| { |
| if (nousb) { |
| info("USB support disabled\n"); |
| return 0; |
| } |
| |
| bus_register(&usb_bus_type); |
| usb_host_init(); |
| usb_major_init(); |
| usbfs_init(); |
| usb_hub_init(); |
| |
| driver_register(&usb_generic_driver); |
| |
| return 0; |
| } |
| |
| /* |
| * Cleanup |
| */ |
| /*static*/ void __exit usb_exit(void) |
| { |
| /* This will matter if shutdown/reboot does exitcalls. */ |
| if (nousb) |
| return; |
| |
| driver_unregister(&usb_generic_driver); |
| // usb_major_cleanup(); |
| // usbfs_cleanup(); |
| // usb_hub_cleanup(); |
| // usb_host_cleanup(); |
| // bus_unregister(&usb_bus_type); |
| } |
| |
| subsys_initcall(usb_init); |
| module_exit(usb_exit); |
| |
| /* |
| * USB may be built into the kernel or be built as modules. |
| * These symbols are exported for device (or host controller) |
| * driver modules to use. |
| */ |
| EXPORT_SYMBOL(usb_epnum_to_ep_desc); |
| |
| EXPORT_SYMBOL(usb_register); |
| EXPORT_SYMBOL(usb_deregister); |
| EXPORT_SYMBOL(usb_disabled); |
| |
| EXPORT_SYMBOL(usb_alloc_dev); |
| EXPORT_SYMBOL(usb_put_dev); |
| EXPORT_SYMBOL(usb_get_dev); |
| EXPORT_SYMBOL(usb_hub_tt_clear_buffer); |
| |
| EXPORT_SYMBOL(usb_driver_claim_interface); |
| EXPORT_SYMBOL(usb_interface_claimed); |
| EXPORT_SYMBOL(usb_driver_release_interface); |
| EXPORT_SYMBOL(usb_match_id); |
| EXPORT_SYMBOL(usb_find_interface); |
| EXPORT_SYMBOL(usb_ifnum_to_if); |
| |
| EXPORT_SYMBOL(usb_reset_device); |
| EXPORT_SYMBOL(usb_disconnect); |
| |
| EXPORT_SYMBOL(__usb_get_extra_descriptor); |
| |
| EXPORT_SYMBOL(usb_find_device); |
| EXPORT_SYMBOL(usb_get_current_frame_number); |
| |
| EXPORT_SYMBOL (usb_buffer_alloc); |
| EXPORT_SYMBOL (usb_buffer_free); |
| |
| EXPORT_SYMBOL (usb_buffer_map); |
| EXPORT_SYMBOL (usb_buffer_dmasync); |
| EXPORT_SYMBOL (usb_buffer_unmap); |
| |
| EXPORT_SYMBOL (usb_buffer_map_sg); |
| EXPORT_SYMBOL (usb_buffer_dmasync_sg); |
| EXPORT_SYMBOL (usb_buffer_unmap_sg); |
| |
| MODULE_LICENSE("GPL"); |