From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/usb/core/usb.c | 1121 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1121 insertions(+) create mode 100644 drivers/usb/core/usb.c (limited to 'drivers/usb/core/usb.c') diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c new file mode 100644 index 000000000..8d5b2f411 --- /dev/null +++ b/drivers/usb/core/usb.c @@ -0,0 +1,1121 @@ +/* + * 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 +#include +#include +#include +#include +#include /* for in_interrupt() */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "usb.h" + + +const char *usbcore_name = "usbcore"; + +static bool nousb; /* Disable USB when built into kernel image */ + +/* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */ +#ifdef MODULE +module_param(nousb, bool, 0444); +#else +core_param(nousb, nousb, bool, 0444); +#endif + +/* + * for external read access to + */ +int usb_disabled(void) +{ + return nousb; +} +EXPORT_SYMBOL_GPL(usb_disabled); + +#ifdef CONFIG_PM +static int usb_autosuspend_delay = 2; /* Default delay value, + * in seconds */ +module_param_named(autosuspend, usb_autosuspend_delay, int, 0644); +MODULE_PARM_DESC(autosuspend, "default autosuspend delay"); + +#else +#define usb_autosuspend_delay 0 +#endif + + +/** + * usb_find_alt_setting() - Given a configuration, find the alternate setting + * for the given interface. + * @config: the configuration to search (not necessarily the current config). + * @iface_num: interface number to search in + * @alt_num: alternate interface setting number to search for. + * + * Search the configuration's interface cache for the given alt setting. + * + * Return: The alternate setting, if found. %NULL otherwise. + */ +struct usb_host_interface *usb_find_alt_setting( + struct usb_host_config *config, + unsigned int iface_num, + unsigned int alt_num) +{ + struct usb_interface_cache *intf_cache = NULL; + int i; + + for (i = 0; i < config->desc.bNumInterfaces; i++) { + if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber + == iface_num) { + intf_cache = config->intf_cache[i]; + break; + } + } + if (!intf_cache) + return NULL; + for (i = 0; i < intf_cache->num_altsetting; i++) + if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num) + return &intf_cache->altsetting[i]; + + printk(KERN_DEBUG "Did not find alt setting %u for intf %u, " + "config %u\n", alt_num, iface_num, + config->desc.bConfigurationValue); + return NULL; +} +EXPORT_SYMBOL_GPL(usb_find_alt_setting); + +/** + * usb_ifnum_to_if - get the interface object with a given interface number + * @dev: the device whose current configuration is considered + * @ifnum: the desired interface + * + * This walks the device descriptor for the currently active configuration + * to find the interface object with the particular interface number. + * + * 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! + * + * Return: A pointer to the interface that has @ifnum as interface number, + * if found. %NULL otherwise. + */ +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. + * + * 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! + * + * Return: A pointer to the entry of the altsetting array of @intf that + * has @altnum as the alternate setting number. %NULL if not found. + */ +struct usb_host_interface *usb_altnum_to_altsetting( + const struct usb_interface *intf, + unsigned int altnum) +{ + int i; + + for (i = 0; i < intf->num_altsetting; i++) { + if (intf->altsetting[i].desc.bAlternateSetting == altnum) + return &intf->altsetting[i]; + } + return NULL; +} +EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting); + +struct find_interface_arg { + int minor; + struct device_driver *drv; +}; + +static int __find_interface(struct device *dev, void *data) +{ + struct find_interface_arg *arg = data; + struct usb_interface *intf; + + if (!is_usb_interface(dev)) + return 0; + + if (dev->driver != arg->drv) + return 0; + intf = to_usb_interface(dev); + return intf->minor == arg->minor; +} + +/** + * usb_find_interface - find usb_interface pointer for driver and device + * @drv: the driver whose current configuration is considered + * @minor: the minor number of the desired device + * + * This walks the bus device list and returns a pointer to the interface + * with the matching minor and driver. Note, this only works for devices + * that share the USB major number. + * + * Return: A pointer to the interface with the matching major and @minor. + */ +struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor) +{ + struct find_interface_arg argb; + struct device *dev; + + argb.minor = minor; + argb.drv = &drv->drvwrap.driver; + + dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface); + + /* Drop reference count from bus_find_device */ + put_device(dev); + + return dev ? to_usb_interface(dev) : NULL; +} +EXPORT_SYMBOL_GPL(usb_find_interface); + +struct each_dev_arg { + void *data; + int (*fn)(struct usb_device *, void *); +}; + +static int __each_dev(struct device *dev, void *data) +{ + struct each_dev_arg *arg = (struct each_dev_arg *)data; + + /* There are struct usb_interface on the same bus, filter them out */ + if (!is_usb_device(dev)) + return 0; + + return arg->fn(container_of(dev, struct usb_device, dev), arg->data); +} + +/** + * usb_for_each_dev - iterate over all USB devices in the system + * @data: data pointer that will be handed to the callback function + * @fn: callback function to be called for each USB device + * + * Iterate over all USB devices and call @fn for each, passing it @data. If it + * returns anything other than 0, we break the iteration prematurely and return + * that value. + */ +int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)) +{ + struct each_dev_arg arg = {data, fn}; + + return bus_for_each_dev(&usb_bus_type, NULL, &arg, __each_dev); +} +EXPORT_SYMBOL_GPL(usb_for_each_dev); + +/** + * usb_release_dev - free a usb device structure when all users of it are finished. + * @dev: device that's been disconnected + * + * Will be called only by the device core when all users of this usb device are + * done. + */ +static void usb_release_dev(struct device *dev) +{ + struct usb_device *udev; + struct usb_hcd *hcd; + + udev = to_usb_device(dev); + hcd = bus_to_hcd(udev->bus); + + usb_destroy_configuration(udev); + usb_release_bos_descriptor(udev); + usb_put_hcd(hcd); + kfree(udev->product); + kfree(udev->manufacturer); + kfree(udev->serial); + kfree(udev); +} + +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; +} + +#ifdef CONFIG_PM + +/* USB device Power-Management thunks. + * There's no need to distinguish here between quiescing a USB device + * and powering it down; the generic_suspend() routine takes care of + * it by skipping the usb_port_suspend() call for a quiesce. And for + * USB interfaces there's no difference at all. + */ + +static int usb_dev_prepare(struct device *dev) +{ + return 0; /* Implement eventually? */ +} + +static void usb_dev_complete(struct device *dev) +{ + /* Currently used only for rebinding interfaces */ + usb_resume_complete(dev); +} + +static int usb_dev_suspend(struct device *dev) +{ + return usb_suspend(dev, PMSG_SUSPEND); +} + +static int usb_dev_resume(struct device *dev) +{ + return usb_resume(dev, PMSG_RESUME); +} + +static int usb_dev_freeze(struct device *dev) +{ + return usb_suspend(dev, PMSG_FREEZE); +} + +static int usb_dev_thaw(struct device *dev) +{ + return usb_resume(dev, PMSG_THAW); +} + +static int usb_dev_poweroff(struct device *dev) +{ + return usb_suspend(dev, PMSG_HIBERNATE); +} + +static int usb_dev_restore(struct device *dev) +{ + return usb_resume(dev, PMSG_RESTORE); +} + +static const struct dev_pm_ops usb_device_pm_ops = { + .prepare = usb_dev_prepare, + .complete = usb_dev_complete, + .suspend = usb_dev_suspend, + .resume = usb_dev_resume, + .freeze = usb_dev_freeze, + .thaw = usb_dev_thaw, + .poweroff = usb_dev_poweroff, + .restore = usb_dev_restore, + .runtime_suspend = usb_runtime_suspend, + .runtime_resume = usb_runtime_resume, + .runtime_idle = usb_runtime_idle, +}; + +#endif /* CONFIG_PM */ + + +static char *usb_devnode(struct device *dev, + umode_t *mode, kuid_t *uid, kgid_t *gid) +{ + struct usb_device *usb_dev; + + usb_dev = to_usb_device(dev); + return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d", + usb_dev->bus->busnum, usb_dev->devnum); +} + +struct device_type usb_device_type = { + .name = "usb_device", + .release = usb_release_dev, + .uevent = usb_dev_uevent, + .devnode = usb_devnode, +#ifdef CONFIG_PM + .pm = &usb_device_pm_ops, +#endif +}; + + +/* Returns 1 if @usb_bus is WUSB, 0 otherwise */ +static unsigned usb_bus_is_wusb(struct usb_bus *bus) +{ + struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self); + return hcd->wireless; +} + + +/** + * usb_alloc_dev - usb device constructor (usbcore-internal) + * @parent: hub to which device is connected; null to allocate a root hub + * @bus: bus used to access the device + * @port1: one-based index of port; ignored for root hubs + * Context: !in_interrupt() + * + * Only hub drivers (including virtual root hub drivers for host + * controllers) should ever call this. + * + * This call may not be used in a non-sleeping context. + * + * Return: On success, a pointer to the allocated usb device. %NULL on + * failure. + */ +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 = bus_to_hcd(bus); + unsigned root_hub = 0; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return NULL; + + if (!usb_get_hcd(usb_hcd)) { + kfree(dev); + return NULL; + } + /* Root hubs aren't true devices, so don't allocate HCD resources */ + if (usb_hcd->driver->alloc_dev && parent && + !usb_hcd->driver->alloc_dev(usb_hcd, dev)) { + usb_put_hcd(bus_to_hcd(bus)); + kfree(dev); + return NULL; + } + + device_initialize(&dev->dev); + dev->dev.bus = &usb_bus_type; + dev->dev.type = &usb_device_type; + dev->dev.groups = usb_device_groups; + dev->dev.dma_mask = bus->controller->dma_mask; + set_dev_node(&dev->dev, dev_to_node(bus->controller)); + dev->state = USB_STATE_ATTACHED; + dev->lpm_disable_count = 1; + atomic_set(&dev->urbnum, 0); + + INIT_LIST_HEAD(&dev->ep0.urb_list); + dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; + dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; + /* ep0 maxpacket comes later, from device descriptor */ + usb_enable_endpoint(dev, &dev->ep0, false); + dev->can_submit = 1; + + /* Save readable and stable topology id, distinguishing devices + * by location for diagnostics, tools, driver model, etc. The + * string is a path along hub ports, from the root. Each device's + * dev->devpath will be stable until USB is re-cabled, and hubs + * are often labeled with these port numbers. The name isn't + * as stable: bus->busnum changes easily from modprobe order, + * cardbus or pci hotplugging, and so on. + */ + if (unlikely(!parent)) { + dev->devpath[0] = '0'; + dev->route = 0; + + dev->dev.parent = bus->controller; + dev_set_name(&dev->dev, "usb%d", bus->busnum); + root_hub = 1; + } else { + /* match any labeling on the hubs; it's one-based */ + if (parent->devpath[0] == '0') { + snprintf(dev->devpath, sizeof dev->devpath, + "%d", port1); + /* Root ports are not counted in route string */ + dev->route = 0; + } else { + snprintf(dev->devpath, sizeof dev->devpath, + "%s.%d", parent->devpath, port1); + /* Route string assumes hubs have less than 16 ports */ + if (port1 < 15) + dev->route = parent->route + + (port1 << ((parent->level - 1)*4)); + else + dev->route = parent->route + + (15 << ((parent->level - 1)*4)); + } + + dev->dev.parent = &parent->dev; + dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath); + + /* hub driver sets up TT records */ + } + + dev->portnum = port1; + dev->bus = bus; + dev->parent = parent; + INIT_LIST_HEAD(&dev->filelist); + +#ifdef CONFIG_PM + pm_runtime_set_autosuspend_delay(&dev->dev, + usb_autosuspend_delay * 1000); + dev->connect_time = jiffies; + dev->active_duration = -jiffies; +#endif + if (root_hub) /* Root hub always ok [and always wired] */ + dev->authorized = 1; + else { + dev->authorized = usb_hcd->authorized_default; + dev->wusb = usb_bus_is_wusb(bus) ? 1 : 0; + } + return dev; +} +EXPORT_SYMBOL_GPL(usb_alloc_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. + * + * Return: A pointer to the device with the incremented reference counter. + */ +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. + * + * Return: A pointer to the interface with the incremented reference counter. + */ +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. + * + * Return: A negative error code for failure, otherwise 0. + */ +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 && (iface->condition == USB_INTERFACE_UNBINDING || + iface->condition == USB_INTERFACE_UNBOUND)) + return -EINTR; + + while (!usb_trylock_device(udev)) { + + /* 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_UNBINDING || + iface->condition == USB_INTERFACE_UNBOUND)) + return -EINTR; + } + return 0; +} +EXPORT_SYMBOL_GPL(usb_lock_device_for_reset); + +/** + * usb_get_current_frame_number - return current bus frame number + * @dev: the device whose bus is being queried + * + * Return: The current frame number for the USB host controller used + * with the given USB device. This can be used when scheduling + * isochronous requests. + * + * Note: 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_alloc_coherent - 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: 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). + * + * Note: + * 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_free_coherent(). + */ +void *usb_alloc_coherent(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_alloc_coherent); + +/** + * usb_free_coherent - free memory allocated with usb_alloc_coherent() + * @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_alloc_coherent(), and the parameters must match + * those provided in that allocation request. + */ +void usb_free_coherent(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_free_coherent); + +/** + * usb_buffer_map - create DMA mapping(s) for an urb + * @urb: urb whose transfer_buffer/setup_packet will be mapped + * + * URB_NO_TRANSFER_DMA_MAP is 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(). + * + * Return: Either %NULL (indicating no buffer could be mapped), or @urb. + * + */ +#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); + /* 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; + 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_for_cpu(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_for_cpu(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); + } + urb->transfer_flags &= ~URB_NO_TRANSFER_DMA_MAP; +} +EXPORT_SYMBOL_GPL(usb_buffer_unmap); +#endif /* 0 */ + +#if 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: Either < 0 (indicating no buffers could be mapped), or the + * number of DMA mapping array entries in the scatterlist. + * + * Note: + * 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 -EINVAL; + + /* 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) ? : -ENOMEM; +} +EXPORT_SYMBOL_GPL(usb_buffer_map_sg); +#endif + +/* 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_for_cpu(controller, sg, n_hw_ents, + is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE); +} +EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg); +#endif + +#if 0 +/** + * 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); +#endif + +/* + * Notifications of device and interface registration + */ +static int usb_bus_notify(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct device *dev = data; + + switch (action) { + case BUS_NOTIFY_ADD_DEVICE: + if (dev->type == &usb_device_type) + (void) usb_create_sysfs_dev_files(to_usb_device(dev)); + else if (dev->type == &usb_if_device_type) + usb_create_sysfs_intf_files(to_usb_interface(dev)); + break; + + case BUS_NOTIFY_DEL_DEVICE: + if (dev->type == &usb_device_type) + usb_remove_sysfs_dev_files(to_usb_device(dev)); + else if (dev->type == &usb_if_device_type) + usb_remove_sysfs_intf_files(to_usb_interface(dev)); + break; + } + return 0; +} + +static struct notifier_block usb_bus_nb = { + .notifier_call = usb_bus_notify, +}; + +struct dentry *usb_debug_root; +EXPORT_SYMBOL_GPL(usb_debug_root); + +static struct dentry *usb_debug_devices; + +static int usb_debugfs_init(void) +{ + usb_debug_root = debugfs_create_dir("usb", NULL); + if (!usb_debug_root) + return -ENOENT; + + usb_debug_devices = debugfs_create_file("devices", 0444, + usb_debug_root, NULL, + &usbfs_devices_fops); + if (!usb_debug_devices) { + debugfs_remove(usb_debug_root); + usb_debug_root = NULL; + return -ENOENT; + } + + return 0; +} + +static void usb_debugfs_cleanup(void) +{ + debugfs_remove(usb_debug_devices); + debugfs_remove(usb_debug_root); +} + +/* + * Init + */ +static int __init usb_init(void) +{ + int retval; + if (usb_disabled()) { + pr_info("%s: USB support disabled\n", usbcore_name); + return 0; + } + usb_init_pool_max(); + + retval = usb_debugfs_init(); + if (retval) + goto out; + + usb_acpi_register(); + retval = bus_register(&usb_bus_type); + if (retval) + goto bus_register_failed; + retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb); + if (retval) + goto bus_notifier_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 = 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: + usb_devio_cleanup(); +usb_devio_init_failed: + usb_deregister(&usbfs_driver); +driver_register_failed: + usb_major_cleanup(); +major_init_failed: + bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); +bus_notifier_failed: + bus_unregister(&usb_bus_type); +bus_register_failed: + usb_acpi_unregister(); + usb_debugfs_cleanup(); +out: + return retval; +} + +/* + * Cleanup + */ +static void __exit usb_exit(void) +{ + /* This will matter if shutdown/reboot does exitcalls. */ + if (usb_disabled()) + return; + + usb_deregister_device_driver(&usb_generic_driver); + usb_major_cleanup(); + usb_deregister(&usbfs_driver); + usb_devio_cleanup(); + usb_hub_cleanup(); + bus_unregister_notifier(&usb_bus_type, &usb_bus_nb); + bus_unregister(&usb_bus_type); + usb_acpi_unregister(); + usb_debugfs_cleanup(); +} + +subsys_initcall(usb_init); +module_exit(usb_exit); +MODULE_LICENSE("GPL"); -- cgit v1.2.3-54-g00ecf