4 * We call the USB code inside a Linux-based peripheral device a "gadget"
5 * driver, except for the hardware-specific bus glue. One USB host can
6 * master many USB gadgets, but the gadgets are only slaved to one host.
9 * (C) Copyright 2002-2004 by David Brownell
10 * All Rights Reserved.
12 * This software is licensed under the GNU GPL version 2.
15 #ifndef __LINUX_USB_GADGET_H
16 #define __LINUX_USB_GADGET_H
18 #include <linux/device.h>
19 #include <linux/errno.h>
20 #include <linux/init.h>
21 #include <linux/list.h>
22 #include <linux/slab.h>
23 #include <linux/scatterlist.h>
24 #include <linux/types.h>
25 #include <linux/workqueue.h>
26 #include <linux/usb/ch9.h>
31 * struct usb_request - describes one i/o request
32 * @buf: Buffer used for data. Always provide this; some controllers
33 * only use PIO, or don't use DMA for some endpoints.
34 * @dma: DMA address corresponding to 'buf'. If you don't set this
35 * field, and the usb controller needs one, it is responsible
36 * for mapping and unmapping the buffer.
37 * @sg: a scatterlist for SG-capable controllers.
38 * @num_sgs: number of SG entries
39 * @num_mapped_sgs: number of SG entries mapped to DMA (internal)
40 * @length: Length of that data
41 * @stream_id: The stream id, when USB3.0 bulk streams are being used
42 * @no_interrupt: If true, hints that no completion irq is needed.
43 * Helpful sometimes with deep request queues that are handled
44 * directly by DMA controllers.
45 * @zero: If true, when writing data, makes the last packet be "short"
46 * by adding a zero length packet as needed;
47 * @short_not_ok: When reading data, makes short packets be
48 * treated as errors (queue stops advancing till cleanup).
49 * @complete: Function called when request completes, so this request and
50 * its buffer may be re-used. The function will always be called with
51 * interrupts disabled, and it must not sleep.
52 * Reads terminate with a short packet, or when the buffer fills,
53 * whichever comes first. When writes terminate, some data bytes
54 * will usually still be in flight (often in a hardware fifo).
55 * Errors (for reads or writes) stop the queue from advancing
56 * until the completion function returns, so that any transfers
57 * invalidated by the error may first be dequeued.
58 * @context: For use by the completion callback
59 * @list: For use by the gadget driver.
60 * @status: Reports completion code, zero or a negative errno.
61 * Normally, faults block the transfer queue from advancing until
62 * the completion callback returns.
63 * Code "-ESHUTDOWN" indicates completion caused by device disconnect,
64 * or when the driver disabled the endpoint.
65 * @actual: Reports bytes transferred to/from the buffer. For reads (OUT
66 * transfers) this may be less than the requested length. If the
67 * short_not_ok flag is set, short reads are treated as errors
68 * even when status otherwise indicates successful completion.
69 * Note that for writes (IN transfers) some data bytes may still
70 * reside in a device-side FIFO when the request is reported as
73 * These are allocated/freed through the endpoint they're used with. The
74 * hardware's driver can add extra per-request data to the memory it returns,
75 * which often avoids separate memory allocations (potential failures),
76 * later when the request is queued.
78 * Request flags affect request handling, such as whether a zero length
79 * packet is written (the "zero" flag), whether a short read should be
80 * treated as an error (blocking request queue advance, the "short_not_ok"
81 * flag), or hinting that an interrupt is not required (the "no_interrupt"
82 * flag, for use with deep request queues).
84 * Bulk endpoints can use any size buffers, and can also be used for interrupt
85 * transfers. interrupt-only endpoints can be much less functional.
87 * NOTE: this is analogous to 'struct urb' on the host side, except that
88 * it's thinner and promotes more pre-allocation.
96 struct scatterlist *sg;
98 unsigned num_mapped_sgs;
100 unsigned stream_id:16;
101 unsigned no_interrupt:1;
103 unsigned short_not_ok:1;
105 void (*complete)(struct usb_ep *ep,
106 struct usb_request *req);
108 struct list_head list;
114 /*-------------------------------------------------------------------------*/
116 /* endpoint-specific parts of the api to the usb controller hardware.
117 * unlike the urb model, (de)multiplexing layers are not required.
118 * (so this api could slash overhead if used on the host side...)
120 * note that device side usb controllers commonly differ in how many
121 * endpoints they support, as well as their capabilities.
124 int (*enable) (struct usb_ep *ep,
125 const struct usb_endpoint_descriptor *desc);
126 int (*disable) (struct usb_ep *ep);
128 struct usb_request *(*alloc_request) (struct usb_ep *ep,
130 void (*free_request) (struct usb_ep *ep, struct usb_request *req);
132 int (*queue) (struct usb_ep *ep, struct usb_request *req,
134 int (*dequeue) (struct usb_ep *ep, struct usb_request *req);
136 int (*set_halt) (struct usb_ep *ep, int value);
137 int (*set_wedge) (struct usb_ep *ep);
139 int (*fifo_status) (struct usb_ep *ep);
140 void (*fifo_flush) (struct usb_ep *ep);
144 * struct usb_ep_caps - endpoint capabilities description
145 * @type_control:Endpoint supports control type (reserved for ep0).
146 * @type_iso:Endpoint supports isochronous transfers.
147 * @type_bulk:Endpoint supports bulk transfers.
148 * @type_int:Endpoint supports interrupt transfers.
149 * @dir_in:Endpoint supports IN direction.
150 * @dir_out:Endpoint supports OUT direction.
153 unsigned type_control:1;
155 unsigned type_bulk:1;
161 #define USB_EP_CAPS_TYPE_CONTROL 0x01
162 #define USB_EP_CAPS_TYPE_ISO 0x02
163 #define USB_EP_CAPS_TYPE_BULK 0x04
164 #define USB_EP_CAPS_TYPE_INT 0x08
165 #define USB_EP_CAPS_TYPE_ALL \
166 (USB_EP_CAPS_TYPE_ISO | USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT)
167 #define USB_EP_CAPS_DIR_IN 0x01
168 #define USB_EP_CAPS_DIR_OUT 0x02
169 #define USB_EP_CAPS_DIR_ALL (USB_EP_CAPS_DIR_IN | USB_EP_CAPS_DIR_OUT)
171 #define USB_EP_CAPS(_type, _dir) \
173 .type_control = !!(_type & USB_EP_CAPS_TYPE_CONTROL), \
174 .type_iso = !!(_type & USB_EP_CAPS_TYPE_ISO), \
175 .type_bulk = !!(_type & USB_EP_CAPS_TYPE_BULK), \
176 .type_int = !!(_type & USB_EP_CAPS_TYPE_INT), \
177 .dir_in = !!(_dir & USB_EP_CAPS_DIR_IN), \
178 .dir_out = !!(_dir & USB_EP_CAPS_DIR_OUT), \
182 * struct usb_ep - device side representation of USB endpoint
183 * @name:identifier for the endpoint, such as "ep-a" or "ep9in-bulk"
184 * @ops: Function pointers used to access hardware-specific operations.
185 * @ep_list:the gadget's ep_list holds all of its endpoints
186 * @caps:The structure describing types and directions supported by endoint.
187 * @maxpacket:The maximum packet size used on this endpoint. The initial
188 * value can sometimes be reduced (hardware allowing), according to
189 * the endpoint descriptor used to configure the endpoint.
190 * @maxpacket_limit:The maximum packet size value which can be handled by this
191 * endpoint. It's set once by UDC driver when endpoint is initialized, and
192 * should not be changed. Should not be confused with maxpacket.
193 * @max_streams: The maximum number of streams supported
194 * by this EP (0 - 16, actual number is 2^n)
195 * @mult: multiplier, 'mult' value for SS Isoc EPs
196 * @maxburst: the maximum number of bursts supported by this EP (for usb3)
197 * @driver_data:for use by the gadget driver.
198 * @address: used to identify the endpoint when finding descriptor that
199 * matches connection speed
200 * @desc: endpoint descriptor. This pointer is set before the endpoint is
201 * enabled and remains valid until the endpoint is disabled.
202 * @comp_desc: In case of SuperSpeed support, this is the endpoint companion
203 * descriptor that is used to configure the endpoint
205 * the bus controller driver lists all the general purpose endpoints in
206 * gadget->ep_list. the control endpoint (gadget->ep0) is not in that list,
207 * and is accessed only in response to a driver setup() callback.
214 const struct usb_ep_ops *ops;
215 struct list_head ep_list;
216 struct usb_ep_caps caps;
219 unsigned maxpacket:16;
220 unsigned maxpacket_limit:16;
221 unsigned max_streams:16;
225 const struct usb_endpoint_descriptor *desc;
226 const struct usb_ss_ep_comp_descriptor *comp_desc;
229 /*-------------------------------------------------------------------------*/
231 #if IS_ENABLED(CONFIG_USB_GADGET)
232 void usb_ep_set_maxpacket_limit(struct usb_ep *ep, unsigned maxpacket_limit);
233 int usb_ep_enable(struct usb_ep *ep);
234 int usb_ep_disable(struct usb_ep *ep);
235 struct usb_request *usb_ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags);
236 void usb_ep_free_request(struct usb_ep *ep, struct usb_request *req);
237 int usb_ep_queue(struct usb_ep *ep, struct usb_request *req, gfp_t gfp_flags);
238 int usb_ep_dequeue(struct usb_ep *ep, struct usb_request *req);
239 int usb_ep_set_halt(struct usb_ep *ep);
240 int usb_ep_clear_halt(struct usb_ep *ep);
241 int usb_ep_set_wedge(struct usb_ep *ep);
242 int usb_ep_fifo_status(struct usb_ep *ep);
243 void usb_ep_fifo_flush(struct usb_ep *ep);
245 static inline void usb_ep_set_maxpacket_limit(struct usb_ep *ep,
246 unsigned maxpacket_limit)
248 static inline int usb_ep_enable(struct usb_ep *ep)
250 static inline int usb_ep_disable(struct usb_ep *ep)
252 static inline struct usb_request *usb_ep_alloc_request(struct usb_ep *ep,
255 static inline void usb_ep_free_request(struct usb_ep *ep,
256 struct usb_request *req)
258 static inline int usb_ep_queue(struct usb_ep *ep, struct usb_request *req,
261 static inline int usb_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
263 static inline int usb_ep_set_halt(struct usb_ep *ep)
265 static inline int usb_ep_clear_halt(struct usb_ep *ep)
267 static inline int usb_ep_set_wedge(struct usb_ep *ep)
269 static inline int usb_ep_fifo_status(struct usb_ep *ep)
271 static inline void usb_ep_fifo_flush(struct usb_ep *ep)
273 #endif /* USB_GADGET */
275 /*-------------------------------------------------------------------------*/
277 struct usb_dcd_config_params {
278 __u8 bU1devExitLat; /* U1 Device exit Latency */
279 #define USB_DEFAULT_U1_DEV_EXIT_LAT 0x01 /* Less then 1 microsec */
280 __le16 bU2DevExitLat; /* U2 Device exit Latency */
281 #define USB_DEFAULT_U2_DEV_EXIT_LAT 0x1F4 /* Less then 500 microsec */
286 struct usb_gadget_driver;
289 /* the rest of the api to the controller hardware: device operations,
290 * which don't involve endpoints (or i/o).
292 struct usb_gadget_ops {
293 int (*get_frame)(struct usb_gadget *);
294 int (*wakeup)(struct usb_gadget *);
295 int (*set_selfpowered) (struct usb_gadget *, int is_selfpowered);
296 int (*vbus_session) (struct usb_gadget *, int is_active);
297 int (*vbus_draw) (struct usb_gadget *, unsigned mA);
298 int (*pullup) (struct usb_gadget *, int is_on);
299 int (*ioctl)(struct usb_gadget *,
300 unsigned code, unsigned long param);
301 void (*get_config_params)(struct usb_dcd_config_params *);
302 int (*udc_start)(struct usb_gadget *,
303 struct usb_gadget_driver *);
304 int (*udc_stop)(struct usb_gadget *);
305 struct usb_ep *(*match_ep)(struct usb_gadget *,
306 struct usb_endpoint_descriptor *,
307 struct usb_ss_ep_comp_descriptor *);
311 * struct usb_gadget - represents a usb slave device
312 * @work: (internal use) Workqueue to be used for sysfs_notify()
313 * @udc: struct usb_udc pointer for this gadget
314 * @ops: Function pointers used to access hardware-specific operations.
315 * @ep0: Endpoint zero, used when reading or writing responses to
316 * driver setup() requests
317 * @ep_list: List of other endpoints supported by the device.
318 * @speed: Speed of current connection to USB host.
319 * @max_speed: Maximal speed the UDC can handle. UDC must support this
320 * and all slower speeds.
321 * @state: the state we are now (attached, suspended, configured, etc)
322 * @name: Identifies the controller hardware type. Used in diagnostics
323 * and sometimes configuration.
324 * @dev: Driver model state for this abstract device.
325 * @out_epnum: last used out ep number
326 * @in_epnum: last used in ep number
327 * @otg_caps: OTG capabilities of this gadget.
328 * @sg_supported: true if we can handle scatter-gather
329 * @is_otg: True if the USB device port uses a Mini-AB jack, so that the
330 * gadget driver must provide a USB OTG descriptor.
331 * @is_a_peripheral: False unless is_otg, the "A" end of a USB cable
332 * is in the Mini-AB jack, and HNP has been used to switch roles
333 * so that the "A" device currently acts as A-Peripheral, not A-Host.
334 * @a_hnp_support: OTG device feature flag, indicating that the A-Host
335 * supports HNP at this port.
336 * @a_alt_hnp_support: OTG device feature flag, indicating that the A-Host
337 * only supports HNP on a different root port.
338 * @b_hnp_enable: OTG device feature flag, indicating that the A-Host
339 * enabled HNP support.
340 * @hnp_polling_support: OTG device feature flag, indicating if the OTG device
341 * in peripheral mode can support HNP polling.
342 * @host_request_flag: OTG device feature flag, indicating if A-Peripheral
343 * or B-Peripheral wants to take host role.
344 * @quirk_ep_out_aligned_size: epout requires buffer size to be aligned to
346 * @is_selfpowered: if the gadget is self-powered.
347 * @deactivated: True if gadget is deactivated - in deactivated state it cannot
349 * @connected: True if gadget is connected.
351 * Gadgets have a mostly-portable "gadget driver" implementing device
352 * functions, handling all usb configurations and interfaces. Gadget
353 * drivers talk to hardware-specific code indirectly, through ops vectors.
354 * That insulates the gadget driver from hardware details, and packages
355 * the hardware endpoints through generic i/o queues. The "usb_gadget"
356 * and "usb_ep" interfaces provide that insulation from the hardware.
358 * Except for the driver data, all fields in this structure are
359 * read-only to the gadget driver. That driver data is part of the
360 * "driver model" infrastructure in 2.6 (and later) kernels, and for
361 * earlier systems is grouped in a similar structure that's not known
362 * to the rest of the kernel.
364 * Values of the three OTG device feature flags are updated before the
365 * setup() call corresponding to USB_REQ_SET_CONFIGURATION, and before
366 * driver suspend() calls. They are valid only when is_otg, and when the
367 * device is acting as a B-Peripheral (so is_a_peripheral is false).
370 struct work_struct work;
372 /* readonly to gadget driver */
373 const struct usb_gadget_ops *ops;
375 struct list_head ep_list; /* of usb_ep */
376 enum usb_device_speed speed;
377 enum usb_device_speed max_speed;
378 enum usb_device_state state;
383 struct usb_otg_caps *otg_caps;
385 unsigned sg_supported:1;
387 unsigned is_a_peripheral:1;
388 unsigned b_hnp_enable:1;
389 unsigned a_hnp_support:1;
390 unsigned a_alt_hnp_support:1;
391 unsigned hnp_polling_support:1;
392 unsigned host_request_flag:1;
393 unsigned quirk_ep_out_aligned_size:1;
394 unsigned quirk_altset_not_supp:1;
395 unsigned quirk_stall_not_supp:1;
396 unsigned quirk_zlp_not_supp:1;
397 unsigned is_selfpowered:1;
398 unsigned deactivated:1;
399 unsigned connected:1;
401 #define work_to_gadget(w) (container_of((w), struct usb_gadget, work))
403 static inline void set_gadget_data(struct usb_gadget *gadget, void *data)
404 { dev_set_drvdata(&gadget->dev, data); }
405 static inline void *get_gadget_data(struct usb_gadget *gadget)
406 { return dev_get_drvdata(&gadget->dev); }
407 static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev)
409 return container_of(dev, struct usb_gadget, dev);
412 /* iterates the non-control endpoints; 'tmp' is a struct usb_ep pointer */
413 #define gadget_for_each_ep(tmp, gadget) \
414 list_for_each_entry(tmp, &(gadget)->ep_list, ep_list)
417 * usb_ep_align_maybe - returns @len aligned to ep's maxpacketsize if gadget
418 * requires quirk_ep_out_aligned_size, otherwise reguens len.
419 * @g: controller to check for quirk
420 * @ep: the endpoint whose maxpacketsize is used to align @len
421 * @len: buffer size's length to align to @ep's maxpacketsize
423 * This helper is used in case it's required for any reason to check and maybe
424 * align buffer's size to an ep's maxpacketsize.
427 usb_ep_align_maybe(struct usb_gadget *g, struct usb_ep *ep, size_t len)
429 return !g->quirk_ep_out_aligned_size ? len :
430 round_up(len, (size_t)ep->desc->wMaxPacketSize);
434 * gadget_is_altset_supported - return true iff the hardware supports
436 * @g: controller to check for quirk
438 static inline int gadget_is_altset_supported(struct usb_gadget *g)
440 return !g->quirk_altset_not_supp;
444 * gadget_is_stall_supported - return true iff the hardware supports stalling
445 * @g: controller to check for quirk
447 static inline int gadget_is_stall_supported(struct usb_gadget *g)
449 return !g->quirk_stall_not_supp;
453 * gadget_is_zlp_supported - return true iff the hardware supports zlp
454 * @g: controller to check for quirk
456 static inline int gadget_is_zlp_supported(struct usb_gadget *g)
458 return !g->quirk_zlp_not_supp;
462 * gadget_is_dualspeed - return true iff the hardware handles high speed
463 * @g: controller that might support both high and full speeds
465 static inline int gadget_is_dualspeed(struct usb_gadget *g)
467 return g->max_speed >= USB_SPEED_HIGH;
471 * gadget_is_superspeed() - return true if the hardware handles superspeed
472 * @g: controller that might support superspeed
474 static inline int gadget_is_superspeed(struct usb_gadget *g)
476 return g->max_speed >= USB_SPEED_SUPER;
480 * gadget_is_superspeed_plus() - return true if the hardware handles
482 * @g: controller that might support superspeed plus
484 static inline int gadget_is_superspeed_plus(struct usb_gadget *g)
486 return g->max_speed >= USB_SPEED_SUPER_PLUS;
490 * gadget_is_otg - return true iff the hardware is OTG-ready
491 * @g: controller that might have a Mini-AB connector
493 * This is a runtime test, since kernels with a USB-OTG stack sometimes
494 * run on boards which only have a Mini-B (or Mini-A) connector.
496 static inline int gadget_is_otg(struct usb_gadget *g)
498 #ifdef CONFIG_USB_OTG
505 /*-------------------------------------------------------------------------*/
507 #if IS_ENABLED(CONFIG_USB_GADGET)
508 int usb_gadget_frame_number(struct usb_gadget *gadget);
509 int usb_gadget_wakeup(struct usb_gadget *gadget);
510 int usb_gadget_set_selfpowered(struct usb_gadget *gadget);
511 int usb_gadget_clear_selfpowered(struct usb_gadget *gadget);
512 int usb_gadget_vbus_connect(struct usb_gadget *gadget);
513 int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA);
514 int usb_gadget_vbus_disconnect(struct usb_gadget *gadget);
515 int usb_gadget_connect(struct usb_gadget *gadget);
516 int usb_gadget_disconnect(struct usb_gadget *gadget);
517 int usb_gadget_deactivate(struct usb_gadget *gadget);
518 int usb_gadget_activate(struct usb_gadget *gadget);
520 static inline int usb_gadget_frame_number(struct usb_gadget *gadget)
522 static inline int usb_gadget_wakeup(struct usb_gadget *gadget)
524 static inline int usb_gadget_set_selfpowered(struct usb_gadget *gadget)
526 static inline int usb_gadget_clear_selfpowered(struct usb_gadget *gadget)
528 static inline int usb_gadget_vbus_connect(struct usb_gadget *gadget)
530 static inline int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
532 static inline int usb_gadget_vbus_disconnect(struct usb_gadget *gadget)
534 static inline int usb_gadget_connect(struct usb_gadget *gadget)
536 static inline int usb_gadget_disconnect(struct usb_gadget *gadget)
538 static inline int usb_gadget_deactivate(struct usb_gadget *gadget)
540 static inline int usb_gadget_activate(struct usb_gadget *gadget)
542 #endif /* CONFIG_USB_GADGET */
544 /*-------------------------------------------------------------------------*/
547 * struct usb_gadget_driver - driver for usb 'slave' devices
548 * @function: String describing the gadget's function
549 * @max_speed: Highest speed the driver handles.
550 * @setup: Invoked for ep0 control requests that aren't handled by
551 * the hardware level driver. Most calls must be handled by
552 * the gadget driver, including descriptor and configuration
553 * management. The 16 bit members of the setup data are in
554 * USB byte order. Called in_interrupt; this may not sleep. Driver
555 * queues a response to ep0, or returns negative to stall.
556 * @disconnect: Invoked after all transfers have been stopped,
557 * when the host is disconnected. May be called in_interrupt; this
558 * may not sleep. Some devices can't detect disconnect, so this might
559 * not be called except as part of controller shutdown.
560 * @bind: the driver's bind callback
561 * @unbind: Invoked when the driver is unbound from a gadget,
562 * usually from rmmod (after a disconnect is reported).
563 * Called in a context that permits sleeping.
564 * @suspend: Invoked on USB suspend. May be called in_interrupt.
565 * @resume: Invoked on USB resume. May be called in_interrupt.
566 * @reset: Invoked on USB bus reset. It is mandatory for all gadget drivers
567 * and should be called in_interrupt.
568 * @driver: Driver model state for this driver.
569 * @udc_name: A name of UDC this driver should be bound to. If udc_name is NULL,
570 * this driver will be bound to any available UDC.
571 * @pending: UDC core private data used for deferred probe of this driver.
572 * @match_existing_only: If udc is not found, return an error and don't add this
573 * gadget driver to list of pending driver
575 * Devices are disabled till a gadget driver successfully bind()s, which
576 * means the driver will handle setup() requests needed to enumerate (and
577 * meet "chapter 9" requirements) then do some useful work.
579 * If gadget->is_otg is true, the gadget driver must provide an OTG
580 * descriptor during enumeration, or else fail the bind() call. In such
581 * cases, no USB traffic may flow until both bind() returns without
582 * having called usb_gadget_disconnect(), and the USB host stack has
585 * Drivers use hardware-specific knowledge to configure the usb hardware.
586 * endpoint addressing is only one of several hardware characteristics that
587 * are in descriptors the ep0 implementation returns from setup() calls.
589 * Except for ep0 implementation, most driver code shouldn't need change to
590 * run on top of different usb controllers. It'll use endpoints set up by
591 * that ep0 implementation.
593 * The usb controller driver handles a few standard usb requests. Those
594 * include set_address, and feature flags for devices, interfaces, and
595 * endpoints (the get_status, set_feature, and clear_feature requests).
597 * Accordingly, the driver's setup() callback must always implement all
598 * get_descriptor requests, returning at least a device descriptor and
599 * a configuration descriptor. Drivers must make sure the endpoint
600 * descriptors match any hardware constraints. Some hardware also constrains
601 * other descriptors. (The pxa250 allows only configurations 1, 2, or 3).
603 * The driver's setup() callback must also implement set_configuration,
604 * and should also implement set_interface, get_configuration, and
605 * get_interface. Setting a configuration (or interface) is where
606 * endpoints should be activated or (config 0) shut down.
608 * (Note that only the default control endpoint is supported. Neither
609 * hosts nor devices generally support control traffic except to ep0.)
611 * Most devices will ignore USB suspend/resume operations, and so will
612 * not provide those callbacks. However, some may need to change modes
613 * when the host is not longer directing those activities. For example,
614 * local controls (buttons, dials, etc) may need to be re-enabled since
615 * the (remote) host can't do that any longer; or an error state might
616 * be cleared, to make the device behave identically whether or not
617 * power is maintained.
619 struct usb_gadget_driver {
621 enum usb_device_speed max_speed;
622 int (*bind)(struct usb_gadget *gadget,
623 struct usb_gadget_driver *driver);
624 void (*unbind)(struct usb_gadget *);
625 int (*setup)(struct usb_gadget *,
626 const struct usb_ctrlrequest *);
627 void (*disconnect)(struct usb_gadget *);
628 void (*suspend)(struct usb_gadget *);
629 void (*resume)(struct usb_gadget *);
630 void (*reset)(struct usb_gadget *);
632 /* FIXME support safe rmmod */
633 struct device_driver driver;
636 struct list_head pending;
637 unsigned match_existing_only:1;
642 /*-------------------------------------------------------------------------*/
644 /* driver modules register and unregister, as usual.
645 * these calls must be made in a context that can sleep.
647 * these will usually be implemented directly by the hardware-dependent
648 * usb bus interface driver, which will only support a single driver.
652 * usb_gadget_probe_driver - probe a gadget driver
653 * @driver: the driver being registered
656 * Call this in your gadget driver's module initialization function,
657 * to tell the underlying usb controller driver about your driver.
658 * The @bind() function will be called to bind it to a gadget before this
659 * registration call returns. It's expected that the @bind() function will
660 * be in init sections.
662 int usb_gadget_probe_driver(struct usb_gadget_driver *driver);
665 * usb_gadget_unregister_driver - unregister a gadget driver
666 * @driver:the driver being unregistered
669 * Call this in your gadget driver's module cleanup function,
670 * to tell the underlying usb controller that your driver is
671 * going away. If the controller is connected to a USB host,
672 * it will first disconnect(). The driver is also requested
673 * to unbind() and clean up any device state, before this procedure
674 * finally returns. It's expected that the unbind() functions
675 * will in in exit sections, so may not be linked in some kernels.
677 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver);
679 extern int usb_add_gadget_udc_release(struct device *parent,
680 struct usb_gadget *gadget, void (*release)(struct device *dev));
681 extern int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget);
682 extern void usb_del_gadget_udc(struct usb_gadget *gadget);
683 extern char *usb_get_gadget_udc_name(void);
685 /*-------------------------------------------------------------------------*/
687 /* utility to simplify dealing with string descriptors */
690 * struct usb_string - wraps a C string and its USB id
691 * @id:the (nonzero) ID for this string
692 * @s:the string, in UTF-8 encoding
694 * If you're using usb_gadget_get_string(), use this to wrap a string
695 * together with its ID.
703 * struct usb_gadget_strings - a set of USB strings in a given language
704 * @language:identifies the strings' language (0x0409 for en-us)
705 * @strings:array of strings with their ids
707 * If you're using usb_gadget_get_string(), use this to wrap all the
708 * strings for a given language.
710 struct usb_gadget_strings {
711 u16 language; /* 0x0409 for en-us */
712 struct usb_string *strings;
715 struct usb_gadget_string_container {
716 struct list_head list;
720 /* put descriptor for string with that id into buf (buflen >= 256) */
721 int usb_gadget_get_string(struct usb_gadget_strings *table, int id, u8 *buf);
723 /*-------------------------------------------------------------------------*/
725 /* utility to simplify managing config descriptors */
727 /* write vector of descriptors into buffer */
728 int usb_descriptor_fillbuf(void *, unsigned,
729 const struct usb_descriptor_header **);
731 /* build config descriptor from single descriptor vector */
732 int usb_gadget_config_buf(const struct usb_config_descriptor *config,
733 void *buf, unsigned buflen, const struct usb_descriptor_header **desc);
735 /* copy a NULL-terminated vector of descriptors */
736 struct usb_descriptor_header **usb_copy_descriptors(
737 struct usb_descriptor_header **);
740 * usb_free_descriptors - free descriptors returned by usb_copy_descriptors()
741 * @v: vector of descriptors
743 static inline void usb_free_descriptors(struct usb_descriptor_header **v)
749 int usb_assign_descriptors(struct usb_function *f,
750 struct usb_descriptor_header **fs,
751 struct usb_descriptor_header **hs,
752 struct usb_descriptor_header **ss,
753 struct usb_descriptor_header **ssp);
754 void usb_free_all_descriptors(struct usb_function *f);
756 struct usb_descriptor_header *usb_otg_descriptor_alloc(
757 struct usb_gadget *gadget);
758 int usb_otg_descriptor_init(struct usb_gadget *gadget,
759 struct usb_descriptor_header *otg_desc);
760 /*-------------------------------------------------------------------------*/
762 /* utility to simplify map/unmap of usb_requests to/from DMA */
764 extern int usb_gadget_map_request_by_dev(struct device *dev,
765 struct usb_request *req, int is_in);
766 extern int usb_gadget_map_request(struct usb_gadget *gadget,
767 struct usb_request *req, int is_in);
769 extern void usb_gadget_unmap_request_by_dev(struct device *dev,
770 struct usb_request *req, int is_in);
771 extern void usb_gadget_unmap_request(struct usb_gadget *gadget,
772 struct usb_request *req, int is_in);
774 /*-------------------------------------------------------------------------*/
776 /* utility to set gadget state properly */
778 extern void usb_gadget_set_state(struct usb_gadget *gadget,
779 enum usb_device_state state);
781 /*-------------------------------------------------------------------------*/
783 /* utility to tell udc core that the bus reset occurs */
784 extern void usb_gadget_udc_reset(struct usb_gadget *gadget,
785 struct usb_gadget_driver *driver);
787 /*-------------------------------------------------------------------------*/
789 /* utility to give requests back to the gadget layer */
791 extern void usb_gadget_giveback_request(struct usb_ep *ep,
792 struct usb_request *req);
794 /*-------------------------------------------------------------------------*/
796 /* utility to find endpoint by name */
798 extern struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g,
801 /*-------------------------------------------------------------------------*/
803 /* utility to check if endpoint caps match descriptor needs */
805 extern int usb_gadget_ep_match_desc(struct usb_gadget *gadget,
806 struct usb_ep *ep, struct usb_endpoint_descriptor *desc,
807 struct usb_ss_ep_comp_descriptor *ep_comp);
809 /*-------------------------------------------------------------------------*/
811 /* utility to update vbus status for udc core, it may be scheduled */
812 extern void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status);
814 /*-------------------------------------------------------------------------*/
816 /* utility wrapping a simple endpoint selection policy */
818 extern struct usb_ep *usb_ep_autoconfig(struct usb_gadget *,
819 struct usb_endpoint_descriptor *);
822 extern struct usb_ep *usb_ep_autoconfig_ss(struct usb_gadget *,
823 struct usb_endpoint_descriptor *,
824 struct usb_ss_ep_comp_descriptor *);
826 extern void usb_ep_autoconfig_release(struct usb_ep *);
828 extern void usb_ep_autoconfig_reset(struct usb_gadget *);
830 #endif /* __LINUX_USB_GADGET_H */