patch-2.4.23 linux-2.4.23/include/linux/usb_gadget.h
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- Lines: 720
- Date:
2003-11-28 10:26:21.000000000 -0800
- Orig file:
linux-2.4.22/include/linux/usb_gadget.h
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.22/include/linux/usb_gadget.h linux-2.4.23/include/linux/usb_gadget.h
@@ -0,0 +1,719 @@
+/*
+ * <linux/usb_gadget.h>
+ *
+ * We call the USB code inside a Linux-based peripheral device a "gadget"
+ * driver, except for the hardware-specific bus glue. One USB host can
+ * master many USB gadgets, but the gadgets are only slaved to one host.
+ *
+ *
+ * (c) Copyright 2002-2003 by David Brownell
+ * All Rights Reserved.
+ *
+ * This software is licensed under the GNU GPL version 2.
+ */
+
+#ifndef __LINUX_USB_GADGET_H
+#define __LINUX_USB_GADGET_H
+
+#ifdef __KERNEL__
+
+struct usb_ep;
+
+/**
+ * struct usb_request - describes one i/o request
+ * @buf: Buffer used for data. Always provide this; some controllers
+ * only use PIO, or don't use DMA for some endpoints.
+ * @dma: DMA address corresponding to 'buf'. If you don't set this
+ * field, and the usb controller needs one, it is responsible
+ * for mapping and unmapping the buffer.
+ * @length: Length of that data
+ * @no_interrupt: If true, hints that no completion irq is needed.
+ * Helpful sometimes with deep request queues.
+ * @zero: If true, when writing data, makes the last packet be "short"
+ * by adding a zero length packet as needed;
+ * @short_not_ok: When reading data, makes short packets be
+ * treated as errors (queue stops advancing till cleanup).
+ * @complete: Function called when request completes
+ * @context: For use by the completion callback
+ * @list: For use by the gadget driver.
+ * @status: Reports completion code, zero or a negative errno.
+ * Normally, faults block the transfer queue from advancing until
+ * the completion callback returns.
+ * Code "-ESHUTDOWN" indicates completion caused by device disconnect,
+ * or when the driver disabled the endpoint.
+ * @actual: Reports actual bytes transferred. For reads (OUT
+ * transfers) this may be less than the requested length. If the
+ * short_not_ok flag is set, short reads are treated as errors
+ * even when status otherwise indicates successful completion.
+ * Note that for writes (IN transfers) the data bytes may still
+ * reside in a device-side FIFO.
+ *
+ * These are allocated/freed through the endpoint they're used with. The
+ * hardware's driver can add extra per-request data to the memory it returns,
+ * which often avoids separate memory allocations (potential failures),
+ * later when the request is queued.
+ *
+ * Request flags affect request handling, such as whether a zero length
+ * packet is written (the "zero" flag), whether a short read should be
+ * treated as an error (blocking request queue advance, the "short_not_ok"
+ * flag), or hinting that an interrupt is not required (the "no_interrupt"
+ * flag, for use with deep request queues).
+ *
+ * Bulk endpoints can use any size buffers, and can also be used for interrupt
+ * transfers. interrupt-only endpoints can be much less functional.
+ */
+ // NOTE this is analagous to 'struct urb' on the host side,
+ // except that it's thinner and promotes more pre-allocation.
+ //
+ // ISSUE should this be allocated through the device?
+
+struct usb_request {
+ void *buf;
+ unsigned length;
+ dma_addr_t dma;
+
+ unsigned no_interrupt : 1,
+ zero : 1,
+ short_not_ok : 1;
+
+ void (*complete)(struct usb_ep *ep,
+ struct usb_request *req);
+ void *context;
+ struct list_head list;
+
+ int status;
+ unsigned actual;
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoint-specific parts of the api to the usb controller hardware.
+ * unlike the urb model, (de)multiplexing layers are not required.
+ * (so this api could slash overhead if used on the host side...)
+ *
+ * note that device side usb controllers commonly differ in how many
+ * endpoints they support, as well as their capabilities.
+ */
+struct usb_ep_ops {
+ int (*enable) (struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *desc);
+ int (*disable) (struct usb_ep *ep);
+
+ struct usb_request *(*alloc_request) (struct usb_ep *ep,
+ int gfp_flags);
+ void (*free_request) (struct usb_ep *ep, struct usb_request *req);
+
+ void *(*alloc_buffer) (struct usb_ep *ep, unsigned bytes,
+ dma_addr_t *dma, int gfp_flags);
+ void (*free_buffer) (struct usb_ep *ep, void *buf, dma_addr_t dma,
+ unsigned bytes);
+ // NOTE: on 2.5, drivers may also use dma_map() and
+ // dma_sync_single() to manage dma overhead.
+
+ int (*queue) (struct usb_ep *ep, struct usb_request *req,
+ int gfp_flags);
+ int (*dequeue) (struct usb_ep *ep, struct usb_request *req);
+
+ int (*set_halt) (struct usb_ep *ep, int value);
+ int (*fifo_status) (struct usb_ep *ep);
+ void (*fifo_flush) (struct usb_ep *ep);
+};
+
+/**
+ * struct usb_ep - device side representation of USB endpoint
+ * @name:identifier for the endpoint, such as "ep-a" or "ep9in-bulk"
+ * @ep_list:the gadget's ep_list holds all of its endpoints
+ * @maxpacket:the maximum packet size used on this endpoint, as
+ * configured when the endpoint was enabled.
+ * @driver_data:for use by the gadget driver. all other fields are
+ * read-only to gadget drivers.
+ *
+ * the bus controller driver lists all the general purpose endpoints in
+ * gadget->ep_list. the control endpoint (gadget->ep0) is not in that list,
+ * and is accessed only in response to a driver setup() callback.
+ */
+struct usb_ep {
+ void *driver_data;
+
+ const char *name;
+ const struct usb_ep_ops *ops;
+ struct list_head ep_list;
+ unsigned maxpacket : 16;
+};
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * usb_ep_enable - configure endpoint, making it usable
+ * @ep:the endpoint being configured. may not be the endpoint named "ep0".
+ * drivers discover endpoints through the ep_list of a usb_gadget.
+ * @desc:descriptor for desired behavior. caller guarantees this pointer
+ * remains valid until the endpoint is disabled; the data byte order
+ * is little-endian (usb-standard).
+ *
+ * when configurations are set, or when interface settings change, the driver
+ * will enable or disable the relevant endpoints. while it is enabled, an
+ * endpoint may be used for i/o until the driver receives a disconnect() from
+ * the host or until the endpoint is disabled.
+ *
+ * the ep0 implementation (which calls this routine) must ensure that the
+ * hardware capabilities of each endpoint match the descriptor provided
+ * for it. for example, an endpoint named "ep2in-bulk" would be usable
+ * for interrupt transfers as well as bulk, but it likely couldn't be used
+ * for iso transfers or for endpoint 14. some endpoints are fully
+ * configurable, with more generic names like "ep-a". (remember that for
+ * USB, "in" means "towards the USB master".)
+ *
+ * returns zero, or a negative error code.
+ */
+static inline int
+usb_ep_enable (struct usb_ep *ep, const struct usb_endpoint_descriptor *desc)
+{
+ return ep->ops->enable (ep, desc);
+}
+
+/**
+ * usb_ep_disable - endpoint is no longer usable
+ * @ep:the endpoint being unconfigured. may not be the endpoint named "ep0".
+ *
+ * no other task may be using this endpoint when this is called.
+ * any pending and uncompleted requests will complete with status
+ * indicating disconnect (-ESHUTDOWN) before this call returns.
+ * gadget drivers must call usb_ep_enable() again before queueing
+ * requests to the endpoint.
+ *
+ * returns zero, or a negative error code.
+ */
+static inline int
+usb_ep_disable (struct usb_ep *ep)
+{
+ return ep->ops->disable (ep);
+}
+
+/**
+ * usb_ep_alloc_request - allocate a request object to use with this endpoint
+ * @ep:the endpoint to be used with with the request
+ * @gfp_flags:GFP_* flags to use
+ *
+ * Request objects must be allocated with this call, since they normally
+ * need controller-specific setup and may even need endpoint-specific
+ * resources such as allocation of DMA descriptors.
+ * Requests may be submitted with usb_ep_queue(), and receive a single
+ * completion callback. Free requests with usb_ep_free_request(), when
+ * they are no longer needed.
+ *
+ * Returns the request, or null if one could not be allocated.
+ */
+static inline struct usb_request *
+usb_ep_alloc_request (struct usb_ep *ep, int gfp_flags)
+{
+ return ep->ops->alloc_request (ep, gfp_flags);
+}
+
+/**
+ * usb_ep_free_request - frees a request object
+ * @ep:the endpoint associated with the request
+ * @req:the request being freed
+ *
+ * Reverses the effect of usb_ep_alloc_request().
+ * Caller guarantees the request is not queued, and that it will
+ * no longer be requeued (or otherwise used).
+ */
+static inline void
+usb_ep_free_request (struct usb_ep *ep, struct usb_request *req)
+{
+ ep->ops->free_request (ep, req);
+}
+
+/**
+ * usb_ep_alloc_buffer - allocate an I/O buffer
+ * @ep:the endpoint associated with the buffer
+ * @len:length of the desired buffer
+ * @dma:pointer to the buffer's DMA address; must be valid
+ * @gfp_flags:GFP_* flags to use
+ *
+ * Returns a new buffer, or null if one could not be allocated.
+ * The buffer is suitably aligned for dma, if that endpoint uses DMA,
+ * and the caller won't have to care about dma-inconsistency
+ * or any hidden "bounce buffer" mechanism. No additional per-request
+ * DMA mapping will be required for such buffers.
+ * Free it later with usb_ep_free_buffer().
+ *
+ * You don't need to use this call to allocate I/O buffers unless you
+ * want to make sure drivers don't incur costs for such "bounce buffer"
+ * copies or per-request DMA mappings.
+ */
+static inline void *
+usb_ep_alloc_buffer (struct usb_ep *ep, unsigned len, dma_addr_t *dma,
+ int gfp_flags)
+{
+ return ep->ops->alloc_buffer (ep, len, dma, gfp_flags);
+}
+
+/**
+ * usb_ep_free_buffer - frees an i/o buffer
+ * @ep:the endpoint associated with the buffer
+ * @buf:CPU view address of the buffer
+ * @dma:the buffer's DMA address
+ * @len:length of the buffer
+ *
+ * reverses the effect of usb_ep_alloc_buffer().
+ * caller guarantees the buffer will no longer be accessed
+ */
+static inline void
+usb_ep_free_buffer (struct usb_ep *ep, void *buf, dma_addr_t dma, unsigned len)
+{
+ ep->ops->free_buffer (ep, buf, dma, len);
+}
+
+/**
+ * usb_ep_queue - queues (submits) an I/O request to an endpoint.
+ * @ep:the endpoint associated with the request
+ * @req:the request being submitted
+ * @gfp_flags: GFP_* flags to use in case the lower level driver couldn't
+ * pre-allocate all necessary memory with the request.
+ *
+ * This tells the device controller to perform the specified request through
+ * that endpoint (reading or writing a buffer). When the request completes,
+ * including being canceled by usb_ep_dequeue(), the request's completion
+ * routine is called to return the request to the driver. Any endpoint
+ * (except control endpoints like ep0) may have more than one transfer
+ * request queued; they complete in FIFO order. Once a gadget driver
+ * submits a request, that request may not be examined or modified until it
+ * is given back to that driver through the completion callback.
+ *
+ * Each request is turned into one or more packets. The controller driver
+ * never merges adjacent requests into the same packet. OUT transfers
+ * will sometimes use data that's already buffered in the hardware.
+ *
+ * Bulk endpoints can queue any amount of data; the transfer is packetized
+ * automatically. The last packet will be short if the request doesn't fill it
+ * out completely. Zero length packets (ZLPs) should be avoided in portable
+ * protocols since not all usb hardware can successfully handle zero length
+ * packets. (ZLPs may be explicitly written, and may be implicitly written if
+ * the request 'zero' flag is set.) Bulk endpoints may also be used
+ * for interrupt transfers; but the reverse is not true, and some endpoints
+ * won't support every interrupt transfer. (Such as 768 byte packets.)
+ *
+ * Interrupt-only endpoints are less functional than bulk endpoints, for
+ * example by not supporting queueing or not handling buffers that are
+ * larger than the endpoint's maxpacket size. They may also treat data
+ * toggle differently.
+ *
+ * Control endpoints ... after getting a setup() callback, the driver queues
+ * one response (even if it would be zero length). That enables the
+ * status ack, after transfering data as specified in the response. Setup
+ * functions may return negative error codes to generate protocol stalls.
+ * (Note that some USB device controllers disallow protocol stall responses
+ * in some cases.) When control responses are deferred (the response is
+ * written after the setup callback returns), then usb_ep_set_halt() may be
+ * used on ep0 to trigger protocol stalls.
+ *
+ * For periodic endpoints, like interrupt or isochronous ones, the usb host
+ * arranges to poll once per interval, and the gadget driver usually will
+ * have queued some data to transfer at that time.
+ *
+ * Returns zero, or a negative error code. Endpoints that are not enabled
+ * report errors; errors will also be
+ * reported when the usb peripheral is disconnected.
+ */
+static inline int
+usb_ep_queue (struct usb_ep *ep, struct usb_request *req, int gfp_flags)
+{
+ return ep->ops->queue (ep, req, gfp_flags);
+}
+
+/**
+ * usb_ep_dequeue - dequeues (cancels, unlinks) an I/O request from an endpoint
+ * @ep:the endpoint associated with the request
+ * @req:the request being canceled
+ *
+ * if the request is still active on the endpoint, it is dequeued and its
+ * completion routine is called (with status -ECONNRESET); else a negative
+ * error code is returned.
+ *
+ * note that some hardware can't clear out write fifos (to unlink the request
+ * at the head of the queue) except as part of disconnecting from usb. such
+ * restrictions prevent drivers from supporting configuration changes,
+ * even to configuration zero (a "chapter 9" requirement).
+ */
+static inline int usb_ep_dequeue (struct usb_ep *ep, struct usb_request *req)
+{
+ return ep->ops->dequeue (ep, req);
+}
+
+/**
+ * usb_ep_set_halt - sets the endpoint halt feature.
+ * @ep: the non-isochronous endpoint being stalled
+ *
+ * Use this to stall an endpoint, perhaps as an error report.
+ * Except for control endpoints,
+ * the endpoint stays halted (will not stream any data) until the host
+ * clears this feature; drivers may need to empty the endpoint's request
+ * queue first, to make sure no inappropriate transfers happen.
+ *
+ * Note that while an endpoint CLEAR_FEATURE will be invisible to the
+ * gadget driver, a SET_INTERFACE will not be. To reset endpoints for the
+ * current altsetting, see usb_ep_clear_halt(). When switching altsettings,
+ * it's simplest to use usb_ep_enable() or usb_ep_disable() for the endpoints.
+ *
+ * Returns zero, or a negative error code. On success, this call sets
+ * underlying hardware state that blocks data transfers.
+ */
+static inline int
+usb_ep_set_halt (struct usb_ep *ep)
+{
+ return ep->ops->set_halt (ep, 1);
+}
+
+/**
+ * usb_ep_clear_halt - clears endpoint halt, and resets toggle
+ * @ep:the bulk or interrupt endpoint being reset
+ *
+ * Use this when responding to the standard usb "set interface" request,
+ * for endpoints that aren't reconfigured, after clearing any other state
+ * in the endpoint's i/o queue.
+ *
+ * Returns zero, or a negative error code. On success, this call clears
+ * the underlying hardware state reflecting endpoint halt and data toggle.
+ * Note that some hardware can't support this request (like pxa2xx_udc),
+ * and accordingly can't correctly implement interface altsettings.
+ */
+static inline int
+usb_ep_clear_halt (struct usb_ep *ep)
+{
+ return ep->ops->set_halt (ep, 0);
+}
+
+/**
+ * usb_ep_fifo_status - returns number of bytes in fifo, or error
+ * @ep: the endpoint whose fifo status is being checked.
+ *
+ * FIFO endpoints may have "unclaimed data" in them in certain cases,
+ * such as after aborted transfers. Hosts may not have collected all
+ * the IN data written by the gadget driver, as reported by a request
+ * completion. The gadget driver may not have collected all the data
+ * written OUT to it by the host. Drivers that need precise handling for
+ * fault reporting or recovery may need to use this call.
+ *
+ * This returns the number of such bytes in the fifo, or a negative
+ * errno if the endpoint doesn't use a FIFO or doesn't support such
+ * precise handling.
+ */
+static inline int
+usb_ep_fifo_status (struct usb_ep *ep)
+{
+ if (ep->ops->fifo_status)
+ return ep->ops->fifo_status (ep);
+ else
+ return -EOPNOTSUPP;
+}
+
+/**
+ * usb_ep_fifo_flush - flushes contents of a fifo
+ * @ep: the endpoint whose fifo is being flushed.
+ *
+ * This call may be used to flush the "unclaimed data" that may exist in
+ * an endpoint fifo after abnormal transaction terminations. The call
+ * must never be used except when endpoint is not being used for any
+ * protocol translation.
+ */
+static inline void
+usb_ep_fifo_flush (struct usb_ep *ep)
+{
+ if (ep->ops->fifo_flush)
+ ep->ops->fifo_flush (ep);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+struct usb_gadget;
+
+/* the rest of the api to the controller hardware: device operations,
+ * which don't involve endpoints (or i/o).
+ */
+struct usb_gadget_ops {
+ int (*get_frame)(struct usb_gadget *);
+ int (*wakeup)(struct usb_gadget *);
+ int (*set_selfpowered) (struct usb_gadget *, int value);
+ int (*ioctl)(struct usb_gadget *,
+ unsigned code, unsigned long param);
+};
+
+/**
+ * struct usb_gadget - represents a usb slave device
+ * @ep0: Endpoint zero, used when reading or writing responses to
+ * driver setup() requests
+ * @ep_list: List of other endpoints supported by the device.
+ * @speed: Speed of current connection to USB host.
+ * @name: Identifies the controller hardware type. Used in diagnostics
+ * and sometimes configuration.
+ *
+ * Gadgets have a mostly-portable "gadget driver" implementing device
+ * functions, handling all usb configurations and interfaces. They
+ * also have a hardware-specific driver (accessed through ops vectors),
+ * which insulates the gadget driver from hardware details and packages
+ * the hardware endpoints through generic i/o queues.
+ *
+ * Except for the driver data, all fields in this structure are
+ * read-only to the gadget driver. That driver data is part of the
+ * "driver model" infrastructure in 2.5 (and later) kernels, and for
+ * earlier systems is grouped in a similar structure that's not known
+ * to the rest of the kernel.
+ */
+struct usb_gadget {
+ /* readonly to gadget driver */
+ const struct usb_gadget_ops *ops;
+ struct usb_ep *ep0;
+ struct list_head ep_list; /* of usb_ep */
+ enum usb_device_speed speed;
+ const char *name;
+
+ struct __gadget_device {
+ const char *bus_id;
+ void *driver_data;
+ } dev;
+};
+
+static inline void set_gadget_data (struct usb_gadget *gadget, void *data)
+ { gadget->dev.driver_data = data; }
+static inline void *get_gadget_data (struct usb_gadget *gadget)
+ { return gadget->dev.driver_data; }
+
+
+/* iterates the non-control endpoints; 'tmp' is a struct usb_ep pointer */
+#define gadget_for_each_ep(tmp,gadget) \
+ list_for_each_entry(tmp, &(gadget)->ep_list, ep_list)
+
+#ifndef list_for_each_entry
+/* not available in 2.4.18 */
+#define list_for_each_entry(pos, head, member) \
+ for (pos = list_entry((head)->next, typeof(*pos), member), \
+ prefetch(pos->member.next); \
+ &pos->member != (head); \
+ pos = list_entry(pos->member.next, typeof(*pos), member), \
+ prefetch(pos->member.next))
+#endif
+
+
+/**
+ * usb_gadget_frame_number - returns the current frame number
+ * @gadget: controller that reports the frame number
+ *
+ * Returns the usb frame number, normally eleven bits from a SOF packet,
+ * or negative errno if this device doesn't support this capability.
+ */
+static inline int usb_gadget_frame_number (struct usb_gadget *gadget)
+{
+ return gadget->ops->get_frame (gadget);
+}
+
+/**
+ * usb_gadget_wakeup - tries to wake up the host connected to this gadget
+ * @gadget: controller used to wake up the host
+ *
+ * Returns zero on success, else negative error code if the hardware
+ * doesn't support such attempts, or its support has not been enabled
+ * by the usb host. Drivers must return device descriptors that report
+ * their ability to support this, or hosts won't enable it.
+ */
+static inline int usb_gadget_wakeup (struct usb_gadget *gadget)
+{
+ if (!gadget->ops->wakeup)
+ return -EOPNOTSUPP;
+ return gadget->ops->wakeup (gadget);
+}
+
+/**
+ * usb_gadget_set_selfpowered - sets the device selfpowered feature.
+ * @gadget:the device being declared as self-powered
+ *
+ * this affects the device status reported by the hardware driver
+ * to reflect that it now has a local power supply.
+ *
+ * returns zero on success, else negative errno.
+ */
+static inline int
+usb_gadget_set_selfpowered (struct usb_gadget *gadget)
+{
+ if (!gadget->ops->set_selfpowered)
+ return -EOPNOTSUPP;
+ return gadget->ops->set_selfpowered (gadget, 1);
+}
+
+/**
+ * usb_gadget_clear_selfpowered - clear the device selfpowered feature.
+ * @gadget:the device being declared as bus-powered
+ *
+ * this affects the device status reported by the hardware driver.
+ * some hardware may not support bus-powered operation, in which
+ * case this feature's value can never change.
+ *
+ * returns zero on success, else negative errno.
+ */
+static inline int
+usb_gadget_clear_selfpowered (struct usb_gadget *gadget)
+{
+ if (!gadget->ops->set_selfpowered)
+ return -EOPNOTSUPP;
+ return gadget->ops->set_selfpowered (gadget, 0);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * struct usb_gadget_driver - driver for usb 'slave' devices
+ * @function: String describing the gadget's function
+ * @speed: Highest speed the driver handles.
+ * @bind: Invoked when the driver is bound to a gadget, usually
+ * after registering the driver.
+ * At that point, ep0 is fully initialized, and ep_list holds
+ * the currently-available endpoints.
+ * Called in a context that permits sleeping.
+ * @setup: Invoked for ep0 control requests that aren't handled by
+ * the hardware level driver. Most calls must be handled by
+ * the gadget driver, including descriptor and configuration
+ * management. The 16 bit members of the setup data are in
+ * cpu order. Called in_interrupt; this may not sleep. Driver
+ * queues a response to ep0, or returns negative to stall.
+ * @disconnect: Invoked after all transfers have been stopped,
+ * when the host is disconnected. May be called in_interrupt; this
+ * may not sleep. Some devices can't detect disconnect, so this might
+ * not be called except as part of controller shutdown.
+ * @unbind: Invoked when the driver is unbound from a gadget,
+ * usually from rmmod (after a disconnect is reported).
+ * Called in a context that permits sleeping.
+ * @suspend: Invoked on USB suspend. May be called in_interrupt.
+ * @resume: Invoked on USB resume. May be called in_interrupt.
+ *
+ * Devices are disabled till a gadget driver successfully bind()s, which
+ * means the driver will handle setup() requests needed to enumerate (and
+ * meet "chapter 9" requirements) then do some useful work.
+ *
+ * Drivers use hardware-specific knowledge to configure the usb hardware.
+ * endpoint addressing is only one of several hardware characteristics that
+ * are in descriptors the ep0 implementation returns from setup() calls.
+ *
+ * Except for ep0 implementation, most driver code shouldn't need change to
+ * run on top of different usb controllers. It'll use endpoints set up by
+ * that ep0 implementation.
+ *
+ * The usb controller driver handles a few standard usb requests. Those
+ * include set_address, and feature flags for devices, interfaces, and
+ * endpoints (the get_status, set_feature, and clear_feature requests).
+ *
+ * Accordingly, the driver's setup() callback must always implement all
+ * get_descriptor requests, returning at least a device descriptor and
+ * a configuration descriptor. Drivers must make sure the endpoint
+ * descriptors match any hardware constraints. Some hardware also constrains
+ * other descriptors. (The pxa250 allows only configurations 1, 2, or 3).
+ *
+ * The driver's setup() callback must also implement set_configuration,
+ * and should also implement set_interface, get_configuration, and
+ * get_interface. Setting a configuration (or interface) is where
+ * endpoints should be activated or (config 0) shut down.
+ *
+ * (Note that only the default control endpoint is supported. Neither
+ * hosts nor devices generally support control traffic except to ep0.)
+ *
+ * Most devices will ignore USB suspend/resume operations, and so will
+ * not provide those callbacks. However, some may need to change modes
+ * when the host is not longer directing those activities. For example,
+ * local controls (buttons, dials, etc) may need to be re-enabled since
+ * the (remote) host can't do that any longer; or an error state might
+ * be cleared, to make the device behave identically whether or not
+ * power is maintained.
+ */
+struct usb_gadget_driver {
+ char *function;
+ enum usb_device_speed speed;
+ int (*bind)(struct usb_gadget *);
+ void (*unbind)(struct usb_gadget *);
+ int (*setup)(struct usb_gadget *,
+ const struct usb_ctrlrequest *);
+ void (*disconnect)(struct usb_gadget *);
+ void (*suspend)(struct usb_gadget *);
+ void (*resume)(struct usb_gadget *);
+
+ // FIXME support safe rmmod
+ struct __gadget_driver {
+ const char *name;
+ void *driver_data;
+ } driver;
+};
+
+
+
+/*-------------------------------------------------------------------------*/
+
+/* driver modules register and unregister, as usual.
+ * these calls must be made in a context that can sleep.
+ *
+ * these will usually be implemented directly by the hardware-dependent
+ * usb bus interface driver, which will only support a single driver.
+ */
+
+/**
+ * usb_gadget_register_driver - register a gadget driver
+ * @driver:the driver being registered
+ *
+ * Call this in your gadget driver's module initialization function,
+ * to tell the underlying usb controller driver about your driver.
+ * The driver's bind() function will be called to bind it to a
+ * gadget. This function must be called in a context that can sleep.
+ */
+int usb_gadget_register_driver (struct usb_gadget_driver *driver);
+
+/**
+ * usb_gadget_unregister_driver - unregister a gadget driver
+ * @driver:the driver being unregistered
+ *
+ * Call this in your gadget driver's module cleanup function,
+ * to tell the underlying usb controller that your driver is
+ * going away. If the controller is connected to a USB host,
+ * it will first disconnect(). The driver is also requested
+ * to unbind() and clean up any device state, before this procedure
+ * finally returns.
+ * This function must be called in a context that can sleep.
+ */
+int usb_gadget_unregister_driver (struct usb_gadget_driver *driver);
+
+/*-------------------------------------------------------------------------*/
+
+/* utility to simplify dealing with string descriptors */
+
+/**
+ * struct usb_string - wraps a C string and its USB id
+ * @id:the (nonzero) ID for this string
+ * @s:the string, in ISO-8859/1 characters
+ *
+ * If you're using usb_gadget_get_string(), use this to wrap a string
+ * together with its ID.
+ */
+struct usb_string {
+ u8 id;
+ const char *s;
+};
+
+/**
+ * struct usb_gadget_strings - a set of USB strings in a given language
+ * @language:identifies the strings' language (0x0409 for en-us)
+ * @strings:array of strings with their ids
+ *
+ * If you're using usb_gadget_get_string(), use this to wrap all the
+ * strings for a given language.
+ */
+struct usb_gadget_strings {
+ u16 language; /* 0x0409 for en-us */
+ struct usb_string *strings;
+};
+
+/* put descriptor for string with that id into buf (buflen >= 256) */
+int usb_gadget_get_string (struct usb_gadget_strings *table, int id, u8 *buf);
+
+
+#endif /* __KERNEL__ */
+
+#endif /* __LINUX_USB_GADGET_H */
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