--- /dev/null
+/*
+ * 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 <linux/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;
+}
+EXPORT_SYMBOL_GPL(usb_ifnum_to_if);
+
+/**
+ * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number.
+ * @intf: the interface containing the altsetting in question
+ * @altnum: the desired alternate setting number
+ *
+ * This searches the altsetting array of the specified interface for
+ * an entry with the correct bAlternateSetting value and returns a pointer
+ * to that entry, or null.
+ *
+ * Note that altsettings need not be stored sequentially by number, so
+ * it would be incorrect to assume that the first altsetting entry in
+ * the array corresponds to altsetting zero. This routine helps device
+ * drivers avoid such mistakes.
+ *
+ * Don't call this function unless you are bound to the intf interface
+ * or you have locked the device!
+ */
+struct usb_host_interface *usb_altnum_to_altsetting(
+ const struct usb_interface *intf,
+ unsigned int altnum)
+{
+ int i;
+
+ for (i = 0; i < intf->num_altsetting; i++) {
+ if (intf->altsetting[i].desc.bAlternateSetting == altnum)
+ return &intf->altsetting[i];
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting);
+
+struct find_interface_arg {
+ int minor;
+ struct 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;
+}
+EXPORT_SYMBOL_GPL(usb_find_interface);
+
+/**
+ * usb_release_dev - free a usb device structure when all users of it are finished.
+ * @dev: device that's been disconnected
+ *
+ * Will be called only by the device core when all users of this usb device are
+ * done.
+ */
+static void usb_release_dev(struct device *dev)
+{
+ struct usb_device *udev;
+
+ 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);
+}
+
+#ifdef CONFIG_HOTPLUG
+static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct usb_device *usb_dev;
+
+ usb_dev = to_usb_device(dev);
+
+ if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum))
+ return -ENOMEM;
+
+ if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum))
+ return -ENOMEM;
+
+ return 0;
+}
+
+#else
+
+static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ return -ENODEV;
+}
+#endif /* CONFIG_HOTPLUG */
+
+#ifdef CONFIG_PM
+
+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);
+}
+
+/* USB device Power-Management thunks.
+ * There's no need to distinguish here between quiescing a USB device
+ * and powering it down; the generic_suspend() routine takes care of
+ * it by skipping the usb_port_suspend() call for a quiesce. And for
+ * USB interfaces there's no difference at all.
+ */
+
+static int usb_dev_prepare(struct device *dev)
+{
+ return 0; /* Implement eventually? */
+}
+
+static void usb_dev_complete(struct device *dev)
+{
+ /* Currently used only for rebinding interfaces */
+ usb_resume(dev); /* Implement eventually? */
+}
+
+static int usb_dev_suspend(struct device *dev)
+{
+ return usb_suspend(dev, PMSG_SUSPEND);
+}
+
+static int usb_dev_resume(struct device *dev)
+{
+ return usb_resume(dev);
+}
+
+static int usb_dev_freeze(struct device *dev)
+{
+ return usb_suspend(dev, PMSG_FREEZE);
+}
+
+static int usb_dev_thaw(struct device *dev)
+{
+ return usb_resume(dev);
+}
+
+static int usb_dev_poweroff(struct device *dev)
+{
+ return usb_suspend(dev, PMSG_HIBERNATE);
+}
+
+static int usb_dev_restore(struct device *dev)
+{
+ return usb_resume(dev);
+}
+
+static struct pm_ops usb_device_pm_ops = {
+ .prepare = usb_dev_prepare,
+ .complete = usb_dev_complete,
+ .suspend = usb_dev_suspend,
+ .resume = usb_dev_resume,
+ .freeze = usb_dev_freeze,
+ .thaw = usb_dev_thaw,
+ .poweroff = usb_dev_poweroff,
+ .restore = usb_dev_restore,
+};
+
+#else
+
+#define ksuspend_usb_init() 0
+#define ksuspend_usb_cleanup() do {} while (0)
+#define usb_device_pm_ops (*(struct pm_ops *)0)
+
+#endif /* CONFIG_PM */
+
+struct device_type usb_device_type = {
+ .name = "usb_device",
+ .release = usb_release_dev,
+ .uevent = usb_dev_uevent,
+ .pm = &usb_device_pm_ops,
+};
+
+
+/* Returns 1 if @usb_bus is WUSB, 0 otherwise */
+static unsigned usb_bus_is_wusb(struct usb_bus *bus)
+{
+ struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self);
+ return hcd->wireless;
+}
+
+
+/**
+ * usb_alloc_dev - usb device constructor (usbcore-internal)
+ * @parent: hub to which device is connected; null to allocate a root hub
+ * @bus: bus used to access the device
+ * @port1: one-based index of port; ignored for root hubs
+ * Context: !in_interrupt()
+ *
+ * Only hub drivers (including virtual root hub drivers for host
+ * controllers) should ever call this.
+ *
+ * This call may not be used in a non-sleeping context.
+ */
+struct usb_device *usb_alloc_dev(struct usb_device *parent,
+ struct usb_bus *bus, unsigned port1)
+{
+ struct usb_device *dev;
+ struct usb_hcd *usb_hcd = container_of(bus, struct usb_hcd, self);
+ unsigned root_hub = 0;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+
+ if (!usb_get_hcd(bus_to_hcd(bus))) {
+ kfree(dev);
+ return NULL;
+ }
+
+ device_initialize(&dev->dev);
+ dev->dev.bus = &usb_bus_type;
+ dev->dev.type = &usb_device_type;
+ dev->dev.groups = usb_device_groups;
+ dev->dev.dma_mask = bus->controller->dma_mask;
+ set_dev_node(&dev->dev, dev_to_node(bus->controller));
+ dev->state = USB_STATE_ATTACHED;
+ atomic_set(&dev->urbnum, 0);
+
+ INIT_LIST_HEAD(&dev->ep0.urb_list);
+ dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE;
+ dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT;
+ /* ep0 maxpacket comes later, from device descriptor */
+ usb_enable_endpoint(dev, &dev->ep0, true);
+ dev->can_submit = 1;
+
+ /* Save readable and stable topology id, distinguishing devices
+ * by location for diagnostics, tools, driver model, etc. The
+ * string is a path along hub ports, from the root. Each device's
+ * dev->devpath will be stable until USB is re-cabled, and hubs
+ * are often labeled with these port numbers. The name isn't
+ * as stable: bus->busnum changes easily from modprobe order,
+ * cardbus or pci hotplugging, and so on.
+ */
+ if (unlikely(!parent)) {
+ dev->devpath[0] = '0';
+
+ dev->dev.parent = bus->controller;
+ dev_set_name(&dev->dev, "usb%d", bus->busnum);
+ root_hub = 1;
+ } else {
+ /* match any labeling on the hubs; it's one-based */
+ if (parent->devpath[0] == '0')
+ snprintf(dev->devpath, sizeof dev->devpath,
+ "%d", port1);
+ else
+ snprintf(dev->devpath, sizeof dev->devpath,
+ "%s.%d", parent->devpath, port1);
+
+ dev->dev.parent = &parent->dev;
+ dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath);
+
+ /* hub driver sets up TT records */
+ }
+
+ dev->portnum = port1;
+ dev->bus = bus;
+ dev->parent = parent;
+ INIT_LIST_HEAD(&dev->filelist);
+
+#ifdef CONFIG_PM
+ mutex_init(&dev->pm_mutex);
+ INIT_DELAYED_WORK(&dev->autosuspend, usb_autosuspend_work);
+ dev->autosuspend_delay = usb_autosuspend_delay * HZ;
+ dev->connect_time = jiffies;
+ dev->active_duration = -jiffies;
+#endif
+ if (root_hub) /* Root hub always ok [and always wired] */
+ dev->authorized = 1;
+ else {
+ dev->authorized = usb_hcd->authorized_default;
+ dev->wusb = usb_bus_is_wusb(bus)? 1 : 0;
+ }
+ return dev;
+}
+
+/**
+ * usb_get_dev - increments the reference count of the usb device structure
+ * @dev: the device being referenced
+ *
+ * Each live reference to a device should be refcounted.
+ *
+ * Drivers for USB interfaces should normally record such references in
+ * their probe() methods, when they bind to an interface, and release
+ * them by calling usb_put_dev(), in their disconnect() methods.
+ *
+ * A pointer to the device with the incremented reference counter is returned.
+ */
+struct usb_device *usb_get_dev(struct usb_device *dev)
+{
+ if (dev)
+ get_device(&dev->dev);
+ return dev;
+}
+EXPORT_SYMBOL_GPL(usb_get_dev);
+
+/**
+ * usb_put_dev - release a use of the usb device structure
+ * @dev: device that's been disconnected
+ *
+ * Must be called when a user of a device is finished with it. When the last
+ * user of the device calls this function, the memory of the device is freed.
+ */
+void usb_put_dev(struct usb_device *dev)
+{
+ if (dev)
+ put_device(&dev->dev);
+}
+EXPORT_SYMBOL_GPL(usb_put_dev);
+
+/**
+ * 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;
+}
+EXPORT_SYMBOL_GPL(usb_get_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);
+}
+EXPORT_SYMBOL_GPL(usb_put_intf);
+
+/* 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;
+}
+EXPORT_SYMBOL_GPL(usb_lock_device_for_reset);
+
+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);
+}
+EXPORT_SYMBOL_GPL(usb_get_current_frame_number);
+
+/*-------------------------------------------------------------------*/
+/*
+ * __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;
+}
+EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor);
+
+/**
+ * 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);
+}
+EXPORT_SYMBOL_GPL(usb_buffer_alloc);
+
+/**
+ * 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);
+}
+EXPORT_SYMBOL_GPL(usb_buffer_free);
+
+/**
+ * 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;
+}
+EXPORT_SYMBOL_GPL(usb_buffer_map);
+#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);
+ }
+}
+EXPORT_SYMBOL_GPL(usb_buffer_dmasync);
+#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);
+}
+EXPORT_SYMBOL_GPL(usb_buffer_unmap);
+#endif /* 0 */
+
+/**
+ * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint
+ * @dev: device to which the scatterlist will be mapped
+ * @is_in: mapping transfer 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, int is_in,
+ struct scatterlist *sg, int nents)
+{
+ struct usb_bus *bus;
+ struct device *controller;
+
+ if (!dev
+ || !(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,
+ is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+}
+EXPORT_SYMBOL_GPL(usb_buffer_map_sg);
+
+/* 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
+ * @is_in: mapping transfer 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, int is_in,
+ 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,
+ is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+}
+EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg);
+#endif
+
+/**
+ * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist
+ * @dev: device to which the scatterlist will be mapped
+ * @is_in: mapping transfer 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, int is_in,
+ 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,
+ is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+}
+EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg);
+
+/* 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;
+}
+EXPORT_SYMBOL_GPL(usb_disabled);
+
+/*
+ * 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);
+MODULE_LICENSE("GPL");
projects / kernel-power / blobdiff