| /* |
| * drivers/usb/core/usb.c |
| * |
| * (C) Copyright Linus Torvalds 1999 |
| * (C) Copyright Johannes Erdfelt 1999-2001 |
| * (C) Copyright Andreas Gal 1999 |
| * (C) Copyright Gregory P. Smith 1999 |
| * (C) Copyright Deti Fliegl 1999 (new USB architecture) |
| * (C) Copyright Randy Dunlap 2000 |
| * (C) Copyright David Brownell 2000-2004 |
| * (C) Copyright Yggdrasil Computing, Inc. 2000 |
| * (usb_device_id matching changes by Adam J. Richter) |
| * (C) Copyright Greg Kroah-Hartman 2002-2003 |
| * |
| * NOTE! This is not actually a driver at all, rather this is |
| * just a collection of helper routines that implement the |
| * generic USB things that the real drivers can use.. |
| * |
| * Think of this as a "USB library" rather than anything else. |
| * It should be considered a slave, with no callbacks. Callbacks |
| * are evil. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/string.h> |
| #include <linux/bitops.h> |
| #include <linux/slab.h> |
| #include <linux/interrupt.h> /* for in_interrupt() */ |
| #include <linux/kmod.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/errno.h> |
| #include <linux/usb.h> |
| #include <linux/mutex.h> |
| #include <linux/workqueue.h> |
| |
| #include <asm/io.h> |
| #include <asm/scatterlist.h> |
| #include <linux/mm.h> |
| #include <linux/dma-mapping.h> |
| |
| #include "hcd.h" |
| #include "usb.h" |
| |
| |
| const char *usbcore_name = "usbcore"; |
| |
| static int nousb; /* Disable USB when built into kernel image */ |
| |
| /* Workqueue for autosuspend and for remote wakeup of root hubs */ |
| struct workqueue_struct *ksuspend_usb_wq; |
| |
| #ifdef CONFIG_USB_SUSPEND |
| static int usb_autosuspend_delay = 2; /* Default delay value, |
| * in seconds */ |
| module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); |
| MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); |
| |
| #else |
| #define usb_autosuspend_delay 0 |
| #endif |
| |
| |
| /** |
| * usb_ifnum_to_if - get the interface object with a given interface number |
| * @dev: the device whose current configuration is considered |
| * @ifnum: the desired interface |
| * |
| * This walks the device descriptor for the currently active configuration |
| * and returns a pointer to the interface with that particular interface |
| * number, or null. |
| * |
| * Note that configuration descriptors are not required to assign interface |
| * numbers sequentially, so that it would be incorrect to assume that |
| * the first interface in that descriptor corresponds to interface zero. |
| * This routine helps device drivers avoid such mistakes. |
| * However, you should make sure that you do the right thing with any |
| * alternate settings available for this interfaces. |
| * |
| * Don't call this function unless you are bound to one of the interfaces |
| * on this device or you have locked the device! |
| */ |
| struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
| unsigned ifnum) |
| { |
| struct usb_host_config *config = dev->actconfig; |
| int i; |
| |
| if (!config) |
| return NULL; |
| for (i = 0; i < config->desc.bNumInterfaces; i++) |
| if (config->interface[i]->altsetting[0] |
| .desc.bInterfaceNumber == ifnum) |
| return config->interface[i]; |
| |
| return NULL; |
| } |
| |
| /** |
| * usb_altnum_to_altsetting - get the altsetting structure with a given |
| * alternate setting number. |
| * @intf: the interface containing the altsetting in question |
| * @altnum: the desired alternate setting number |
| * |
| * This searches the altsetting array of the specified interface for |
| * an entry with the correct bAlternateSetting value and returns a pointer |
| * to that entry, or null. |
| * |
| * Note that altsettings need not be stored sequentially by number, so |
| * it would be incorrect to assume that the first altsetting entry in |
| * the array corresponds to altsetting zero. This routine helps device |
| * drivers avoid such mistakes. |
| * |
| * Don't call this function unless you are bound to the intf interface |
| * or you have locked the device! |
| */ |
| struct usb_host_interface *usb_altnum_to_altsetting(const struct usb_interface *intf, |
| unsigned int altnum) |
| { |
| int i; |
| |
| for (i = 0; i < intf->num_altsetting; i++) { |
| if (intf->altsetting[i].desc.bAlternateSetting == altnum) |
| return &intf->altsetting[i]; |
| } |
| return NULL; |
| } |
| |
| struct find_interface_arg { |
| int minor; |
| struct usb_interface *interface; |
| }; |
| |
| static int __find_interface(struct device * dev, void * data) |
| { |
| struct find_interface_arg *arg = data; |
| struct usb_interface *intf; |
| |
| /* can't look at usb devices, only interfaces */ |
| if (is_usb_device(dev)) |
| return 0; |
| |
| intf = to_usb_interface(dev); |
| if (intf->minor != -1 && intf->minor == arg->minor) { |
| arg->interface = intf; |
| return 1; |
| } |
| return 0; |
| } |
| |
| /** |
| * 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 find_interface_arg argb; |
| int retval; |
| |
| argb.minor = minor; |
| argb.interface = NULL; |
| /* eat the error, it will be in argb.interface */ |
| retval = driver_for_each_device(&drv->drvwrap.driver, NULL, &argb, |
| __find_interface); |
| return argb.interface; |
| } |
| |
| /** |
| * usb_release_dev - free a usb device structure when all users of it are finished. |
| * @dev: device that's been disconnected |
| * |
| * Will be called only by the device core when all users of this usb device are |
| * done. |
| */ |
| static void usb_release_dev(struct device *dev) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| |
| usb_destroy_configuration(udev); |
| usb_put_hcd(bus_to_hcd(udev->bus)); |
| kfree(udev->product); |
| kfree(udev->manufacturer); |
| kfree(udev->serial); |
| kfree(udev); |
| } |
| |
| struct device_type usb_device_type = { |
| .name = "usb_device", |
| .release = usb_release_dev, |
| }; |
| |
| #ifdef CONFIG_PM |
| |
| static int ksuspend_usb_init(void) |
| { |
| /* This workqueue is supposed to be both freezable and |
| * singlethreaded. Its job doesn't justify running on more |
| * than one CPU. |
| */ |
| ksuspend_usb_wq = create_freezeable_workqueue("ksuspend_usbd"); |
| if (!ksuspend_usb_wq) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void ksuspend_usb_cleanup(void) |
| { |
| destroy_workqueue(ksuspend_usb_wq); |
| } |
| |
| #else |
| |
| #define ksuspend_usb_init() 0 |
| #define ksuspend_usb_cleanup() do {} while (0) |
| |
| #endif /* CONFIG_PM */ |
| |
| /** |
| * usb_alloc_dev - usb device constructor (usbcore-internal) |
| * @parent: hub to which device is connected; null to allocate a root hub |
| * @bus: bus used to access the device |
| * @port1: one-based index of port; ignored for root hubs |
| * Context: !in_interrupt() |
| * |
| * Only hub drivers (including virtual root hub drivers for host |
| * controllers) should ever call this. |
| * |
| * This call may not be used in a non-sleeping context. |
| */ |
| struct usb_device * |
| usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1) |
| { |
| struct usb_device *dev; |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return NULL; |
| |
| if (!usb_get_hcd(bus_to_hcd(bus))) { |
| kfree(dev); |
| return NULL; |
| } |
| |
| device_initialize(&dev->dev); |
| dev->dev.bus = &usb_bus_type; |
| dev->dev.type = &usb_device_type; |
| dev->dev.dma_mask = bus->controller->dma_mask; |
| set_dev_node(&dev->dev, dev_to_node(bus->controller)); |
| dev->state = USB_STATE_ATTACHED; |
| |
| INIT_LIST_HEAD(&dev->ep0.urb_list); |
| dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; |
| dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; |
| /* ep0 maxpacket comes later, from device descriptor */ |
| usb_enable_endpoint(dev, &dev->ep0); |
| |
| /* Save readable and stable topology id, distinguishing devices |
| * by location for diagnostics, tools, driver model, etc. The |
| * string is a path along hub ports, from the root. Each device's |
| * dev->devpath will be stable until USB is re-cabled, and hubs |
| * are often labeled with these port numbers. The bus_id isn't |
| * as stable: bus->busnum changes easily from modprobe order, |
| * cardbus or pci hotplugging, and so on. |
| */ |
| if (unlikely(!parent)) { |
| dev->devpath[0] = '0'; |
| |
| dev->dev.parent = bus->controller; |
| sprintf(&dev->dev.bus_id[0], "usb%d", bus->busnum); |
| } else { |
| /* match any labeling on the hubs; it's one-based */ |
| if (parent->devpath[0] == '0') |
| snprintf(dev->devpath, sizeof dev->devpath, |
| "%d", port1); |
| else |
| snprintf(dev->devpath, sizeof dev->devpath, |
| "%s.%d", parent->devpath, port1); |
| |
| dev->dev.parent = &parent->dev; |
| sprintf(&dev->dev.bus_id[0], "%d-%s", |
| bus->busnum, dev->devpath); |
| |
| /* hub driver sets up TT records */ |
| } |
| |
| dev->portnum = port1; |
| dev->bus = bus; |
| dev->parent = parent; |
| INIT_LIST_HEAD(&dev->filelist); |
| |
| #ifdef CONFIG_PM |
| mutex_init(&dev->pm_mutex); |
| INIT_DELAYED_WORK(&dev->autosuspend, usb_autosuspend_work); |
| dev->autosuspend_delay = usb_autosuspend_delay * HZ; |
| #endif |
| return dev; |
| } |
| |
| /** |
| * usb_get_dev - increments the reference count of the usb device structure |
| * @dev: the device being referenced |
| * |
| * Each live reference to a device should be refcounted. |
| * |
| * Drivers for USB interfaces should normally record such references in |
| * their probe() methods, when they bind to an interface, and release |
| * them by calling usb_put_dev(), in their disconnect() methods. |
| * |
| * A pointer to the device with the incremented reference counter is returned. |
| */ |
| struct usb_device *usb_get_dev(struct usb_device *dev) |
| { |
| if (dev) |
| get_device(&dev->dev); |
| return dev; |
| } |
| |
| /** |
| * 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); |
| } |
| |
| /** |
| * usb_get_intf - increments the reference count of the usb interface structure |
| * @intf: the interface being referenced |
| * |
| * Each live reference to a interface must 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_intf(), in their disconnect() methods. |
| * |
| * A pointer to the interface with the incremented reference counter is |
| * returned. |
| */ |
| struct usb_interface *usb_get_intf(struct usb_interface *intf) |
| { |
| if (intf) |
| get_device(&intf->dev); |
| return intf; |
| } |
| |
| /** |
| * usb_put_intf - release a use of the usb interface structure |
| * @intf: interface that's been decremented |
| * |
| * Must be called when a user of an interface is finished with it. When the |
| * last user of the interface calls this function, the memory of the interface |
| * is freed. |
| */ |
| void usb_put_intf(struct usb_interface *intf) |
| { |
| if (intf) |
| put_device(&intf->dev); |
| } |
| |
| |
| /* USB device locking |
| * |
| * USB devices and interfaces are locked using the semaphore in their |
| * embedded struct device. The hub driver guarantees that whenever a |
| * device is connected or disconnected, drivers are called with the |
| * USB device locked as well as their particular interface. |
| * |
| * Complications arise when several devices are to be locked at the same |
| * time. Only hub-aware drivers that are part of usbcore ever have to |
| * do this; nobody else needs to worry about it. The rule for locking |
| * is simple: |
| * |
| * When locking both a device and its parent, always lock the |
| * the parent first. |
| */ |
| |
| /** |
| * usb_lock_device_for_reset - cautiously acquire the lock for a |
| * usb device structure |
| * @udev: device that's being locked |
| * @iface: interface bound to the driver making the request (optional) |
| * |
| * Attempts to acquire the device lock, but fails if the device is |
| * NOTATTACHED or SUSPENDED, or if iface is specified and the interface |
| * is neither BINDING nor BOUND. Rather than sleeping to wait for the |
| * lock, the routine polls repeatedly. This is to prevent deadlock with |
| * disconnect; in some drivers (such as usb-storage) the disconnect() |
| * or suspend() method will block waiting for a device reset to complete. |
| * |
| * Returns a negative error code for failure, otherwise 1 or 0 to indicate |
| * that the device will or will not have to be unlocked. (0 can be |
| * returned when an interface is given and is BINDING, because in that |
| * case the driver already owns the device lock.) |
| */ |
| int usb_lock_device_for_reset(struct usb_device *udev, |
| const struct usb_interface *iface) |
| { |
| unsigned long jiffies_expire = jiffies + HZ; |
| |
| if (udev->state == USB_STATE_NOTATTACHED) |
| return -ENODEV; |
| if (udev->state == USB_STATE_SUSPENDED) |
| return -EHOSTUNREACH; |
| if (iface) { |
| switch (iface->condition) { |
| case USB_INTERFACE_BINDING: |
| return 0; |
| case USB_INTERFACE_BOUND: |
| break; |
| default: |
| return -EINTR; |
| } |
| } |
| |
| while (usb_trylock_device(udev) != 0) { |
| |
| /* If we can't acquire the lock after waiting one second, |
| * we're probably deadlocked */ |
| if (time_after(jiffies, jiffies_expire)) |
| return -EBUSY; |
| |
| msleep(15); |
| if (udev->state == USB_STATE_NOTATTACHED) |
| return -ENODEV; |
| if (udev->state == USB_STATE_SUSPENDED) |
| return -EHOSTUNREACH; |
| if (iface && iface->condition != USB_INTERFACE_BOUND) |
| return -EINTR; |
| } |
| return 1; |
| } |
| |
| |
| static struct usb_device *match_device(struct usb_device *dev, |
| u16 vendor_id, u16 product_id) |
| { |
| struct usb_device *ret_dev = NULL; |
| int child; |
| |
| dev_dbg(&dev->dev, "check for vendor %04x, product %04x ...\n", |
| le16_to_cpu(dev->descriptor.idVendor), |
| le16_to_cpu(dev->descriptor.idProduct)); |
| |
| /* see if this device matches */ |
| if ((vendor_id == le16_to_cpu(dev->descriptor.idVendor)) && |
| (product_id == le16_to_cpu(dev->descriptor.idProduct))) { |
| dev_dbg(&dev->dev, "matched this device!\n"); |
| 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]) { |
| usb_lock_device(dev->children[child]); |
| ret_dev = match_device(dev->children[child], |
| vendor_id, product_id); |
| usb_unlock_device(dev->children[child]); |
| 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; |
| |
| mutex_lock(&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); |
| if (!bus->root_hub) |
| continue; |
| usb_lock_device(bus->root_hub); |
| dev = match_device(bus->root_hub, vendor_id, product_id); |
| usb_unlock_device(bus->root_hub); |
| if (dev) |
| goto exit; |
| } |
| exit: |
| mutex_unlock(&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 usb_hcd_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) { |
| printk(KERN_ERR |
| "%s: bogus descriptor, type %d length %d\n", |
| usbcore_name, |
| header->bDescriptorType, |
| header->bLength); |
| return -1; |
| } |
| |
| if (header->bDescriptorType == type) { |
| *ptr = header; |
| return 0; |
| } |
| |
| buffer += header->bLength; |
| size -= header->bLength; |
| } |
| return -1; |
| } |
| |
| /** |
| * 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 thrashing IOMMU |
| * hardware during URB completion/resubmit. The implementation varies between |
| * platforms, depending on details of how DMA will work to this device. |
| * Using these buffers also eliminates cacheline sharing problems on |
| * architectures where CPU caches are not DMA-coherent. On systems without |
| * bus-snooping caches, these buffers are uncached. |
| * |
| * When the buffer is no longer used, free it with usb_buffer_free(). |
| */ |
| void *usb_buffer_alloc( |
| struct usb_device *dev, |
| size_t size, |
| gfp_t mem_flags, |
| dma_addr_t *dma |
| ) |
| { |
| if (!dev || !dev->bus) |
| return NULL; |
| return hcd_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) |
| return; |
| if (!addr) |
| return; |
| hcd_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(). |
| */ |
| #if 0 |
| 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 NULL; |
| |
| 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; |
| } |
| #endif /* 0 */ |
| |
| /* XXX DISABLED, no users currently. If you wish to re-enable this |
| * XXX please determine whether the sync is to transfer ownership of |
| * XXX the buffer from device to cpu or vice verse, and thusly use the |
| * XXX appropriate _for_{cpu,device}() method. -DaveM |
| */ |
| #if 0 |
| |
| /** |
| * 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); |
| } |
| } |
| #endif |
| |
| /** |
| * 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(). |
| */ |
| #if 0 |
| 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); |
| } |
| #endif /* 0 */ |
| |
| /** |
| * 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(const 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); |
| } |
| |
| /* XXX DISABLED, no users currently. If you wish to re-enable this |
| * XXX please determine whether the sync is to transfer ownership of |
| * XXX the buffer from device to cpu or vice verse, and thusly use the |
| * XXX appropriate _for_{cpu,device}() method. -DaveM |
| */ |
| #if 0 |
| |
| /** |
| * 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(const 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); |
| } |
| #endif |
| |
| /** |
| * 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(const 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); |
| } |
| |
| /* format to disable USB on kernel command line is: nousb */ |
| __module_param_call("", nousb, param_set_bool, param_get_bool, &nousb, 0444); |
| |
| /* |
| * for external read access to <nousb> |
| */ |
| int usb_disabled(void) |
| { |
| return nousb; |
| } |
| |
| /* |
| * Init |
| */ |
| static int __init usb_init(void) |
| { |
| int retval; |
| if (nousb) { |
| pr_info("%s: USB support disabled\n", usbcore_name); |
| return 0; |
| } |
| |
| retval = ksuspend_usb_init(); |
| if (retval) |
| goto out; |
| retval = bus_register(&usb_bus_type); |
| if (retval) |
| goto bus_register_failed; |
| retval = usb_host_init(); |
| if (retval) |
| goto host_init_failed; |
| retval = usb_major_init(); |
| if (retval) |
| goto major_init_failed; |
| retval = usb_register(&usbfs_driver); |
| if (retval) |
| goto driver_register_failed; |
| retval = usb_devio_init(); |
| if (retval) |
| goto usb_devio_init_failed; |
| retval = usbfs_init(); |
| if (retval) |
| goto fs_init_failed; |
| retval = usb_hub_init(); |
| if (retval) |
| goto hub_init_failed; |
| retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE); |
| if (!retval) |
| goto out; |
| |
| usb_hub_cleanup(); |
| hub_init_failed: |
| usbfs_cleanup(); |
| fs_init_failed: |
| usb_devio_cleanup(); |
| usb_devio_init_failed: |
| usb_deregister(&usbfs_driver); |
| driver_register_failed: |
| usb_major_cleanup(); |
| major_init_failed: |
| usb_host_cleanup(); |
| host_init_failed: |
| bus_unregister(&usb_bus_type); |
| bus_register_failed: |
| ksuspend_usb_cleanup(); |
| out: |
| return retval; |
| } |
| |
| /* |
| * Cleanup |
| */ |
| static void __exit usb_exit(void) |
| { |
| /* This will matter if shutdown/reboot does exitcalls. */ |
| if (nousb) |
| return; |
| |
| usb_deregister_device_driver(&usb_generic_driver); |
| usb_major_cleanup(); |
| usbfs_cleanup(); |
| usb_deregister(&usbfs_driver); |
| usb_devio_cleanup(); |
| usb_hub_cleanup(); |
| usb_host_cleanup(); |
| bus_unregister(&usb_bus_type); |
| ksuspend_usb_cleanup(); |
| } |
| |
| 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_disabled); |
| |
| EXPORT_SYMBOL_GPL(usb_get_intf); |
| EXPORT_SYMBOL_GPL(usb_put_intf); |
| |
| EXPORT_SYMBOL(usb_put_dev); |
| EXPORT_SYMBOL(usb_get_dev); |
| EXPORT_SYMBOL(usb_hub_tt_clear_buffer); |
| |
| EXPORT_SYMBOL(usb_lock_device_for_reset); |
| |
| EXPORT_SYMBOL(usb_find_interface); |
| EXPORT_SYMBOL(usb_ifnum_to_if); |
| EXPORT_SYMBOL(usb_altnum_to_altsetting); |
| |
| 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); |
| |
| #if 0 |
| EXPORT_SYMBOL(usb_buffer_map); |
| EXPORT_SYMBOL(usb_buffer_dmasync); |
| EXPORT_SYMBOL(usb_buffer_unmap); |
| #endif |
| |
| EXPORT_SYMBOL(usb_buffer_map_sg); |
| #if 0 |
| EXPORT_SYMBOL(usb_buffer_dmasync_sg); |
| #endif |
| EXPORT_SYMBOL(usb_buffer_unmap_sg); |
| |
| MODULE_LICENSE("GPL"); |