2 * composite.c - infrastructure for Composite USB Gadgets
4 * Copyright (C) 2006-2008 David Brownell
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
12 /* #define VERBOSE_DEBUG */
14 #include <linux/kallsyms.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/device.h>
19 #include <linux/utsname.h>
21 #include <linux/usb/composite.h>
22 #include <asm/unaligned.h>
25 * The code in this file is utility code, used to build a gadget driver
26 * from one or more "function" drivers, one or more "configuration"
27 * objects, and a "usb_composite_driver" by gluing them together along
28 * with the relevant device-wide data.
31 /* big enough to hold our biggest descriptor */
32 #define USB_BUFSIZ 1024
34 static struct usb_composite_driver
*composite
;
35 static int (*composite_gadget_bind
)(struct usb_composite_dev
*cdev
);
37 /* Some systems will need runtime overrides for the product identifiers
38 * published in the device descriptor, either numbers or strings or both.
39 * String parameters are in UTF-8 (superset of ASCII's 7 bit characters).
42 static ushort idVendor
;
43 module_param(idVendor
, ushort
, 0644);
44 MODULE_PARM_DESC(idVendor
, "USB Vendor ID");
46 static ushort idProduct
;
47 module_param(idProduct
, ushort
, 0644);
48 MODULE_PARM_DESC(idProduct
, "USB Product ID");
50 static ushort bcdDevice
;
51 module_param(bcdDevice
, ushort
, 0644);
52 MODULE_PARM_DESC(bcdDevice
, "USB Device version (BCD)");
54 static char *iManufacturer
;
55 module_param(iManufacturer
, charp
, 0644);
56 MODULE_PARM_DESC(iManufacturer
, "USB Manufacturer string");
58 static char *iProduct
;
59 module_param(iProduct
, charp
, 0644);
60 MODULE_PARM_DESC(iProduct
, "USB Product string");
62 static char *iSerialNumber
;
63 module_param(iSerialNumber
, charp
, 0644);
64 MODULE_PARM_DESC(iSerialNumber
, "SerialNumber string");
66 static char composite_manufacturer
[50];
68 /*-------------------------------------------------------------------------*/
70 * next_ep_desc() - advance to the next EP descriptor
71 * @t: currect pointer within descriptor array
73 * Return: next EP descriptor or NULL
75 * Iterate over @t until either EP descriptor found or
76 * NULL (that indicates end of list) encountered
78 static struct usb_descriptor_header
**
79 next_ep_desc(struct usb_descriptor_header
**t
)
82 if ((*t
)->bDescriptorType
== USB_DT_ENDPOINT
)
89 * for_each_ep_desc()- iterate over endpoint descriptors in the
91 * @start: pointer within descriptor array.
92 * @ep_desc: endpoint descriptor to use as the loop cursor
94 #define for_each_ep_desc(start, ep_desc) \
95 for (ep_desc = next_ep_desc(start); \
96 ep_desc; ep_desc = next_ep_desc(ep_desc+1))
99 * config_ep_by_speed() - configures the given endpoint
100 * according to gadget speed.
101 * @g: pointer to the gadget
103 * @_ep: the endpoint to configure
105 * Return: error code, 0 on success
107 * This function chooses the right descriptors for a given
108 * endpoint according to gadget speed and saves it in the
109 * endpoint desc field. If the endpoint already has a descriptor
110 * assigned to it - overwrites it with currently corresponding
111 * descriptor. The endpoint maxpacket field is updated according
112 * to the chosen descriptor.
113 * Note: the supplied function should hold all the descriptors
114 * for supported speeds
116 int config_ep_by_speed(struct usb_gadget
*g
,
117 struct usb_function
*f
,
120 struct usb_composite_dev
*cdev
= get_gadget_data(g
);
121 struct usb_endpoint_descriptor
*chosen_desc
= NULL
;
122 struct usb_descriptor_header
**speed_desc
= NULL
;
124 struct usb_ss_ep_comp_descriptor
*comp_desc
= NULL
;
125 int want_comp_desc
= 0;
127 struct usb_descriptor_header
**d_spd
; /* cursor for speed desc */
129 if (!g
|| !f
|| !_ep
)
132 /* select desired speed */
134 case USB_SPEED_SUPER
:
135 if (gadget_is_superspeed(g
)) {
136 speed_desc
= f
->ss_descriptors
;
140 /* else: Fall trough */
142 if (gadget_is_dualspeed(g
)) {
143 speed_desc
= f
->hs_descriptors
;
146 /* else: fall through */
148 speed_desc
= f
->descriptors
;
150 /* find descriptors */
151 for_each_ep_desc(speed_desc
, d_spd
) {
152 chosen_desc
= (struct usb_endpoint_descriptor
*)*d_spd
;
153 if (chosen_desc
->bEndpointAddress
== _ep
->address
)
160 _ep
->maxpacket
= usb_endpoint_maxp(chosen_desc
);
161 _ep
->desc
= chosen_desc
;
162 _ep
->comp_desc
= NULL
;
169 * Companion descriptor should follow EP descriptor
170 * USB 3.0 spec, #9.6.7
172 comp_desc
= (struct usb_ss_ep_comp_descriptor
*)*(++d_spd
);
174 (comp_desc
->bDescriptorType
!= USB_DT_SS_ENDPOINT_COMP
))
176 _ep
->comp_desc
= comp_desc
;
177 if (g
->speed
== USB_SPEED_SUPER
) {
178 switch (usb_endpoint_type(_ep
->desc
)) {
179 case USB_ENDPOINT_XFER_ISOC
:
180 /* mult: bits 1:0 of bmAttributes */
181 _ep
->mult
= comp_desc
->bmAttributes
& 0x3;
182 case USB_ENDPOINT_XFER_BULK
:
183 case USB_ENDPOINT_XFER_INT
:
184 _ep
->maxburst
= comp_desc
->bMaxBurst
+ 1;
187 if (comp_desc
->bMaxBurst
!= 0)
188 ERROR(cdev
, "ep0 bMaxBurst must be 0\n");
197 * usb_add_function() - add a function to a configuration
198 * @config: the configuration
199 * @function: the function being added
200 * Context: single threaded during gadget setup
202 * After initialization, each configuration must have one or more
203 * functions added to it. Adding a function involves calling its @bind()
204 * method to allocate resources such as interface and string identifiers
207 * This function returns the value of the function's bind(), which is
208 * zero for success else a negative errno value.
210 int usb_add_function(struct usb_configuration
*config
,
211 struct usb_function
*function
)
215 DBG(config
->cdev
, "adding '%s'/%p to config '%s'/%p\n",
216 function
->name
, function
,
217 config
->label
, config
);
219 if (!function
->set_alt
|| !function
->disable
)
222 function
->config
= config
;
223 list_add_tail(&function
->list
, &config
->functions
);
225 /* REVISIT *require* function->bind? */
226 if (function
->bind
) {
227 value
= function
->bind(config
, function
);
229 list_del(&function
->list
);
230 function
->config
= NULL
;
235 /* We allow configurations that don't work at both speeds.
236 * If we run into a lowspeed Linux system, treat it the same
237 * as full speed ... it's the function drivers that will need
238 * to avoid bulk and ISO transfers.
240 if (!config
->fullspeed
&& function
->descriptors
)
241 config
->fullspeed
= true;
242 if (!config
->highspeed
&& function
->hs_descriptors
)
243 config
->highspeed
= true;
244 if (!config
->superspeed
&& function
->ss_descriptors
)
245 config
->superspeed
= true;
249 DBG(config
->cdev
, "adding '%s'/%p --> %d\n",
250 function
->name
, function
, value
);
255 * usb_function_deactivate - prevent function and gadget enumeration
256 * @function: the function that isn't yet ready to respond
258 * Blocks response of the gadget driver to host enumeration by
259 * preventing the data line pullup from being activated. This is
260 * normally called during @bind() processing to change from the
261 * initial "ready to respond" state, or when a required resource
264 * For example, drivers that serve as a passthrough to a userspace
265 * daemon can block enumeration unless that daemon (such as an OBEX,
266 * MTP, or print server) is ready to handle host requests.
268 * Not all systems support software control of their USB peripheral
271 * Returns zero on success, else negative errno.
273 int usb_function_deactivate(struct usb_function
*function
)
275 struct usb_composite_dev
*cdev
= function
->config
->cdev
;
279 spin_lock_irqsave(&cdev
->lock
, flags
);
281 if (cdev
->deactivations
== 0)
282 status
= usb_gadget_disconnect(cdev
->gadget
);
284 cdev
->deactivations
++;
286 spin_unlock_irqrestore(&cdev
->lock
, flags
);
291 * usb_function_activate - allow function and gadget enumeration
292 * @function: function on which usb_function_activate() was called
294 * Reverses effect of usb_function_deactivate(). If no more functions
295 * are delaying their activation, the gadget driver will respond to
296 * host enumeration procedures.
298 * Returns zero on success, else negative errno.
300 int usb_function_activate(struct usb_function
*function
)
302 struct usb_composite_dev
*cdev
= function
->config
->cdev
;
305 spin_lock(&cdev
->lock
);
307 if (WARN_ON(cdev
->deactivations
== 0))
310 cdev
->deactivations
--;
311 if (cdev
->deactivations
== 0)
312 status
= usb_gadget_connect(cdev
->gadget
);
315 spin_unlock(&cdev
->lock
);
320 * usb_interface_id() - allocate an unused interface ID
321 * @config: configuration associated with the interface
322 * @function: function handling the interface
323 * Context: single threaded during gadget setup
325 * usb_interface_id() is called from usb_function.bind() callbacks to
326 * allocate new interface IDs. The function driver will then store that
327 * ID in interface, association, CDC union, and other descriptors. It
328 * will also handle any control requests targeted at that interface,
329 * particularly changing its altsetting via set_alt(). There may
330 * also be class-specific or vendor-specific requests to handle.
332 * All interface identifier should be allocated using this routine, to
333 * ensure that for example different functions don't wrongly assign
334 * different meanings to the same identifier. Note that since interface
335 * identifiers are configuration-specific, functions used in more than
336 * one configuration (or more than once in a given configuration) need
337 * multiple versions of the relevant descriptors.
339 * Returns the interface ID which was allocated; or -ENODEV if no
340 * more interface IDs can be allocated.
342 int usb_interface_id(struct usb_configuration
*config
,
343 struct usb_function
*function
)
345 unsigned id
= config
->next_interface_id
;
347 if (id
< MAX_CONFIG_INTERFACES
) {
348 config
->interface
[id
] = function
;
349 config
->next_interface_id
= id
+ 1;
355 static int config_buf(struct usb_configuration
*config
,
356 enum usb_device_speed speed
, void *buf
, u8 type
)
358 struct usb_config_descriptor
*c
= buf
;
359 void *next
= buf
+ USB_DT_CONFIG_SIZE
;
360 int len
= USB_BUFSIZ
- USB_DT_CONFIG_SIZE
;
361 struct usb_function
*f
;
364 /* write the config descriptor */
366 c
->bLength
= USB_DT_CONFIG_SIZE
;
367 c
->bDescriptorType
= type
;
368 /* wTotalLength is written later */
369 c
->bNumInterfaces
= config
->next_interface_id
;
370 c
->bConfigurationValue
= config
->bConfigurationValue
;
371 c
->iConfiguration
= config
->iConfiguration
;
372 c
->bmAttributes
= USB_CONFIG_ATT_ONE
| config
->bmAttributes
;
373 c
->bMaxPower
= config
->bMaxPower
? : (CONFIG_USB_GADGET_VBUS_DRAW
/ 2);
375 /* There may be e.g. OTG descriptors */
376 if (config
->descriptors
) {
377 status
= usb_descriptor_fillbuf(next
, len
,
378 config
->descriptors
);
385 /* add each function's descriptors */
386 list_for_each_entry(f
, &config
->functions
, list
) {
387 struct usb_descriptor_header
**descriptors
;
390 case USB_SPEED_SUPER
:
391 descriptors
= f
->ss_descriptors
;
394 descriptors
= f
->hs_descriptors
;
397 descriptors
= f
->descriptors
;
402 status
= usb_descriptor_fillbuf(next
, len
,
403 (const struct usb_descriptor_header
**) descriptors
);
411 c
->wTotalLength
= cpu_to_le16(len
);
415 static int config_desc(struct usb_composite_dev
*cdev
, unsigned w_value
)
417 struct usb_gadget
*gadget
= cdev
->gadget
;
418 struct usb_configuration
*c
;
419 u8 type
= w_value
>> 8;
420 enum usb_device_speed speed
= USB_SPEED_UNKNOWN
;
422 if (gadget
->speed
== USB_SPEED_SUPER
)
423 speed
= gadget
->speed
;
424 else if (gadget_is_dualspeed(gadget
)) {
426 if (gadget
->speed
== USB_SPEED_HIGH
)
428 if (type
== USB_DT_OTHER_SPEED_CONFIG
)
431 speed
= USB_SPEED_HIGH
;
435 /* This is a lookup by config *INDEX* */
437 list_for_each_entry(c
, &cdev
->configs
, list
) {
438 /* ignore configs that won't work at this speed */
440 case USB_SPEED_SUPER
:
454 return config_buf(c
, speed
, cdev
->req
->buf
, type
);
460 static int count_configs(struct usb_composite_dev
*cdev
, unsigned type
)
462 struct usb_gadget
*gadget
= cdev
->gadget
;
463 struct usb_configuration
*c
;
468 if (gadget_is_dualspeed(gadget
)) {
469 if (gadget
->speed
== USB_SPEED_HIGH
)
471 if (gadget
->speed
== USB_SPEED_SUPER
)
473 if (type
== USB_DT_DEVICE_QUALIFIER
)
476 list_for_each_entry(c
, &cdev
->configs
, list
) {
477 /* ignore configs that won't work at this speed */
494 * bos_desc() - prepares the BOS descriptor.
495 * @cdev: pointer to usb_composite device to generate the bos
498 * This function generates the BOS (Binary Device Object)
499 * descriptor and its device capabilities descriptors. The BOS
500 * descriptor should be supported by a SuperSpeed device.
502 static int bos_desc(struct usb_composite_dev
*cdev
)
504 struct usb_ext_cap_descriptor
*usb_ext
;
505 struct usb_ss_cap_descriptor
*ss_cap
;
506 struct usb_dcd_config_params dcd_config_params
;
507 struct usb_bos_descriptor
*bos
= cdev
->req
->buf
;
509 bos
->bLength
= USB_DT_BOS_SIZE
;
510 bos
->bDescriptorType
= USB_DT_BOS
;
512 bos
->wTotalLength
= cpu_to_le16(USB_DT_BOS_SIZE
);
513 bos
->bNumDeviceCaps
= 0;
516 * A SuperSpeed device shall include the USB2.0 extension descriptor
517 * and shall support LPM when operating in USB2.0 HS mode.
519 usb_ext
= cdev
->req
->buf
+ le16_to_cpu(bos
->wTotalLength
);
520 bos
->bNumDeviceCaps
++;
521 le16_add_cpu(&bos
->wTotalLength
, USB_DT_USB_EXT_CAP_SIZE
);
522 usb_ext
->bLength
= USB_DT_USB_EXT_CAP_SIZE
;
523 usb_ext
->bDescriptorType
= USB_DT_DEVICE_CAPABILITY
;
524 usb_ext
->bDevCapabilityType
= USB_CAP_TYPE_EXT
;
525 usb_ext
->bmAttributes
= cpu_to_le32(USB_LPM_SUPPORT
);
528 * The Superspeed USB Capability descriptor shall be implemented by all
529 * SuperSpeed devices.
531 ss_cap
= cdev
->req
->buf
+ le16_to_cpu(bos
->wTotalLength
);
532 bos
->bNumDeviceCaps
++;
533 le16_add_cpu(&bos
->wTotalLength
, USB_DT_USB_SS_CAP_SIZE
);
534 ss_cap
->bLength
= USB_DT_USB_SS_CAP_SIZE
;
535 ss_cap
->bDescriptorType
= USB_DT_DEVICE_CAPABILITY
;
536 ss_cap
->bDevCapabilityType
= USB_SS_CAP_TYPE
;
537 ss_cap
->bmAttributes
= 0; /* LTM is not supported yet */
538 ss_cap
->wSpeedSupported
= cpu_to_le16(USB_LOW_SPEED_OPERATION
|
539 USB_FULL_SPEED_OPERATION
|
540 USB_HIGH_SPEED_OPERATION
|
541 USB_5GBPS_OPERATION
);
542 ss_cap
->bFunctionalitySupport
= USB_LOW_SPEED_OPERATION
;
544 /* Get Controller configuration */
545 if (cdev
->gadget
->ops
->get_config_params
)
546 cdev
->gadget
->ops
->get_config_params(&dcd_config_params
);
548 dcd_config_params
.bU1devExitLat
= USB_DEFAULT_U1_DEV_EXIT_LAT
;
549 dcd_config_params
.bU2DevExitLat
=
550 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT
);
552 ss_cap
->bU1devExitLat
= dcd_config_params
.bU1devExitLat
;
553 ss_cap
->bU2DevExitLat
= dcd_config_params
.bU2DevExitLat
;
555 return le16_to_cpu(bos
->wTotalLength
);
558 static void device_qual(struct usb_composite_dev
*cdev
)
560 struct usb_qualifier_descriptor
*qual
= cdev
->req
->buf
;
562 qual
->bLength
= sizeof(*qual
);
563 qual
->bDescriptorType
= USB_DT_DEVICE_QUALIFIER
;
564 /* POLICY: same bcdUSB and device type info at both speeds */
565 qual
->bcdUSB
= cdev
->desc
.bcdUSB
;
566 qual
->bDeviceClass
= cdev
->desc
.bDeviceClass
;
567 qual
->bDeviceSubClass
= cdev
->desc
.bDeviceSubClass
;
568 qual
->bDeviceProtocol
= cdev
->desc
.bDeviceProtocol
;
569 /* ASSUME same EP0 fifo size at both speeds */
570 qual
->bMaxPacketSize0
= cdev
->gadget
->ep0
->maxpacket
;
571 qual
->bNumConfigurations
= count_configs(cdev
, USB_DT_DEVICE_QUALIFIER
);
575 /*-------------------------------------------------------------------------*/
577 static void reset_config(struct usb_composite_dev
*cdev
)
579 struct usb_function
*f
;
581 DBG(cdev
, "reset config\n");
583 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
587 bitmap_zero(f
->endpoints
, 32);
592 static int set_config(struct usb_composite_dev
*cdev
,
593 const struct usb_ctrlrequest
*ctrl
, unsigned number
)
595 struct usb_gadget
*gadget
= cdev
->gadget
;
596 struct usb_configuration
*c
= NULL
;
597 int result
= -EINVAL
;
598 unsigned power
= gadget_is_otg(gadget
) ? 8 : 100;
602 list_for_each_entry(c
, &cdev
->configs
, list
) {
603 if (c
->bConfigurationValue
== number
) {
605 * We disable the FDs of the previous
606 * configuration only if the new configuration
617 } else { /* Zero configuration value - need to reset the config */
623 INFO(cdev
, "%s config #%d: %s\n",
624 usb_speed_string(gadget
->speed
),
625 number
, c
? c
->label
: "unconfigured");
632 /* Initialize all interfaces by setting them to altsetting zero. */
633 for (tmp
= 0; tmp
< MAX_CONFIG_INTERFACES
; tmp
++) {
634 struct usb_function
*f
= c
->interface
[tmp
];
635 struct usb_descriptor_header
**descriptors
;
641 * Record which endpoints are used by the function. This is used
642 * to dispatch control requests targeted at that endpoint to the
643 * function's setup callback instead of the current
644 * configuration's setup callback.
646 switch (gadget
->speed
) {
647 case USB_SPEED_SUPER
:
648 descriptors
= f
->ss_descriptors
;
651 descriptors
= f
->hs_descriptors
;
654 descriptors
= f
->descriptors
;
657 for (; *descriptors
; ++descriptors
) {
658 struct usb_endpoint_descriptor
*ep
;
661 if ((*descriptors
)->bDescriptorType
!= USB_DT_ENDPOINT
)
664 ep
= (struct usb_endpoint_descriptor
*)*descriptors
;
665 addr
= ((ep
->bEndpointAddress
& 0x80) >> 3)
666 | (ep
->bEndpointAddress
& 0x0f);
667 set_bit(addr
, f
->endpoints
);
670 result
= f
->set_alt(f
, tmp
, 0);
672 DBG(cdev
, "interface %d (%s/%p) alt 0 --> %d\n",
673 tmp
, f
->name
, f
, result
);
679 if (result
== USB_GADGET_DELAYED_STATUS
) {
681 "%s: interface %d (%s) requested delayed status\n",
682 __func__
, tmp
, f
->name
);
683 cdev
->delayed_status
++;
684 DBG(cdev
, "delayed_status count %d\n",
685 cdev
->delayed_status
);
689 /* when we return, be sure our power usage is valid */
690 power
= c
->bMaxPower
? (2 * c
->bMaxPower
) : CONFIG_USB_GADGET_VBUS_DRAW
;
692 usb_gadget_vbus_draw(gadget
, power
);
693 if (result
>= 0 && cdev
->delayed_status
)
694 result
= USB_GADGET_DELAYED_STATUS
;
699 * usb_add_config() - add a configuration to a device.
700 * @cdev: wraps the USB gadget
701 * @config: the configuration, with bConfigurationValue assigned
702 * @bind: the configuration's bind function
703 * Context: single threaded during gadget setup
705 * One of the main tasks of a composite @bind() routine is to
706 * add each of the configurations it supports, using this routine.
708 * This function returns the value of the configuration's @bind(), which
709 * is zero for success else a negative errno value. Binding configurations
710 * assigns global resources including string IDs, and per-configuration
711 * resources such as interface IDs and endpoints.
713 int usb_add_config(struct usb_composite_dev
*cdev
,
714 struct usb_configuration
*config
,
715 int (*bind
)(struct usb_configuration
*))
717 int status
= -EINVAL
;
718 struct usb_configuration
*c
;
720 DBG(cdev
, "adding config #%u '%s'/%p\n",
721 config
->bConfigurationValue
,
722 config
->label
, config
);
724 if (!config
->bConfigurationValue
|| !bind
)
727 /* Prevent duplicate configuration identifiers */
728 list_for_each_entry(c
, &cdev
->configs
, list
) {
729 if (c
->bConfigurationValue
== config
->bConfigurationValue
) {
736 list_add_tail(&config
->list
, &cdev
->configs
);
738 INIT_LIST_HEAD(&config
->functions
);
739 config
->next_interface_id
= 0;
740 memset(config
->interface
, 0, sizeof(config
->interface
));
742 status
= bind(config
);
744 while (!list_empty(&config
->functions
)) {
745 struct usb_function
*f
;
747 f
= list_first_entry(&config
->functions
,
748 struct usb_function
, list
);
751 DBG(cdev
, "unbind function '%s'/%p\n",
753 f
->unbind(config
, f
);
754 /* may free memory for "f" */
757 list_del(&config
->list
);
762 DBG(cdev
, "cfg %d/%p speeds:%s%s%s\n",
763 config
->bConfigurationValue
, config
,
764 config
->superspeed
? " super" : "",
765 config
->highspeed
? " high" : "",
767 ? (gadget_is_dualspeed(cdev
->gadget
)
772 for (i
= 0; i
< MAX_CONFIG_INTERFACES
; i
++) {
773 struct usb_function
*f
= config
->interface
[i
];
777 DBG(cdev
, " interface %d = %s/%p\n",
782 /* set_alt(), or next bind(), sets up
783 * ep->driver_data as needed.
785 usb_ep_autoconfig_reset(cdev
->gadget
);
789 DBG(cdev
, "added config '%s'/%u --> %d\n", config
->label
,
790 config
->bConfigurationValue
, status
);
794 static void remove_config(struct usb_composite_dev
*cdev
,
795 struct usb_configuration
*config
)
797 while (!list_empty(&config
->functions
)) {
798 struct usb_function
*f
;
800 f
= list_first_entry(&config
->functions
,
801 struct usb_function
, list
);
804 DBG(cdev
, "unbind function '%s'/%p\n", f
->name
, f
);
805 f
->unbind(config
, f
);
806 /* may free memory for "f" */
809 list_del(&config
->list
);
810 if (config
->unbind
) {
811 DBG(cdev
, "unbind config '%s'/%p\n", config
->label
, config
);
812 config
->unbind(config
);
813 /* may free memory for "c" */
818 * usb_remove_config() - remove a configuration from a device.
819 * @cdev: wraps the USB gadget
820 * @config: the configuration
822 * Drivers must call usb_gadget_disconnect before calling this function
823 * to disconnect the device from the host and make sure the host will not
824 * try to enumerate the device while we are changing the config list.
826 void usb_remove_config(struct usb_composite_dev
*cdev
,
827 struct usb_configuration
*config
)
831 spin_lock_irqsave(&cdev
->lock
, flags
);
833 if (cdev
->config
== config
)
836 spin_unlock_irqrestore(&cdev
->lock
, flags
);
838 remove_config(cdev
, config
);
841 /*-------------------------------------------------------------------------*/
843 /* We support strings in multiple languages ... string descriptor zero
844 * says which languages are supported. The typical case will be that
845 * only one language (probably English) is used, with I18N handled on
849 static void collect_langs(struct usb_gadget_strings
**sp
, __le16
*buf
)
851 const struct usb_gadget_strings
*s
;
857 language
= cpu_to_le16(s
->language
);
858 for (tmp
= buf
; *tmp
&& tmp
< &buf
[126]; tmp
++) {
859 if (*tmp
== language
)
868 static int lookup_string(
869 struct usb_gadget_strings
**sp
,
875 struct usb_gadget_strings
*s
;
880 if (s
->language
!= language
)
882 value
= usb_gadget_get_string(s
, id
, buf
);
889 static int get_string(struct usb_composite_dev
*cdev
,
890 void *buf
, u16 language
, int id
)
892 struct usb_configuration
*c
;
893 struct usb_function
*f
;
897 /* Yes, not only is USB's I18N support probably more than most
898 * folk will ever care about ... also, it's all supported here.
899 * (Except for UTF8 support for Unicode's "Astral Planes".)
902 /* 0 == report all available language codes */
904 struct usb_string_descriptor
*s
= buf
;
905 struct usb_gadget_strings
**sp
;
908 s
->bDescriptorType
= USB_DT_STRING
;
910 sp
= composite
->strings
;
912 collect_langs(sp
, s
->wData
);
914 list_for_each_entry(c
, &cdev
->configs
, list
) {
917 collect_langs(sp
, s
->wData
);
919 list_for_each_entry(f
, &c
->functions
, list
) {
922 collect_langs(sp
, s
->wData
);
926 for (len
= 0; len
<= 126 && s
->wData
[len
]; len
++)
931 s
->bLength
= 2 * (len
+ 1);
935 /* Otherwise, look up and return a specified string. First
936 * check if the string has not been overridden.
938 if (cdev
->manufacturer_override
== id
)
939 str
= iManufacturer
?: composite
->iManufacturer
?:
940 composite_manufacturer
;
941 else if (cdev
->product_override
== id
)
942 str
= iProduct
?: composite
->iProduct
;
943 else if (cdev
->serial_override
== id
)
944 str
= iSerialNumber
?: composite
->iSerialNumber
;
948 struct usb_gadget_strings strings
= {
949 .language
= language
,
950 .strings
= &(struct usb_string
) { 0xff, str
}
952 return usb_gadget_get_string(&strings
, 0xff, buf
);
955 /* String IDs are device-scoped, so we look up each string
956 * table we're told about. These lookups are infrequent;
957 * simpler-is-better here.
959 if (composite
->strings
) {
960 len
= lookup_string(composite
->strings
, buf
, language
, id
);
964 list_for_each_entry(c
, &cdev
->configs
, list
) {
966 len
= lookup_string(c
->strings
, buf
, language
, id
);
970 list_for_each_entry(f
, &c
->functions
, list
) {
973 len
= lookup_string(f
->strings
, buf
, language
, id
);
982 * usb_string_id() - allocate an unused string ID
983 * @cdev: the device whose string descriptor IDs are being allocated
984 * Context: single threaded during gadget setup
986 * @usb_string_id() is called from bind() callbacks to allocate
987 * string IDs. Drivers for functions, configurations, or gadgets will
988 * then store that ID in the appropriate descriptors and string table.
990 * All string identifier should be allocated using this,
991 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
992 * that for example different functions don't wrongly assign different
993 * meanings to the same identifier.
995 int usb_string_id(struct usb_composite_dev
*cdev
)
997 if (cdev
->next_string_id
< 254) {
998 /* string id 0 is reserved by USB spec for list of
999 * supported languages */
1000 /* 255 reserved as well? -- mina86 */
1001 cdev
->next_string_id
++;
1002 return cdev
->next_string_id
;
1008 * usb_string_ids() - allocate unused string IDs in batch
1009 * @cdev: the device whose string descriptor IDs are being allocated
1010 * @str: an array of usb_string objects to assign numbers to
1011 * Context: single threaded during gadget setup
1013 * @usb_string_ids() is called from bind() callbacks to allocate
1014 * string IDs. Drivers for functions, configurations, or gadgets will
1015 * then copy IDs from the string table to the appropriate descriptors
1016 * and string table for other languages.
1018 * All string identifier should be allocated using this,
1019 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1020 * example different functions don't wrongly assign different meanings
1021 * to the same identifier.
1023 int usb_string_ids_tab(struct usb_composite_dev
*cdev
, struct usb_string
*str
)
1025 int next
= cdev
->next_string_id
;
1027 for (; str
->s
; ++str
) {
1028 if (unlikely(next
>= 254))
1033 cdev
->next_string_id
= next
;
1039 * usb_string_ids_n() - allocate unused string IDs in batch
1040 * @c: the device whose string descriptor IDs are being allocated
1041 * @n: number of string IDs to allocate
1042 * Context: single threaded during gadget setup
1044 * Returns the first requested ID. This ID and next @n-1 IDs are now
1045 * valid IDs. At least provided that @n is non-zero because if it
1046 * is, returns last requested ID which is now very useful information.
1048 * @usb_string_ids_n() is called from bind() callbacks to allocate
1049 * string IDs. Drivers for functions, configurations, or gadgets will
1050 * then store that ID in the appropriate descriptors and string table.
1052 * All string identifier should be allocated using this,
1053 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1054 * example different functions don't wrongly assign different meanings
1055 * to the same identifier.
1057 int usb_string_ids_n(struct usb_composite_dev
*c
, unsigned n
)
1059 unsigned next
= c
->next_string_id
;
1060 if (unlikely(n
> 254 || (unsigned)next
+ n
> 254))
1062 c
->next_string_id
+= n
;
1067 /*-------------------------------------------------------------------------*/
1069 static void composite_setup_complete(struct usb_ep
*ep
, struct usb_request
*req
)
1071 if (req
->status
|| req
->actual
!= req
->length
)
1072 DBG((struct usb_composite_dev
*) ep
->driver_data
,
1073 "setup complete --> %d, %d/%d\n",
1074 req
->status
, req
->actual
, req
->length
);
1078 * The setup() callback implements all the ep0 functionality that's
1079 * not handled lower down, in hardware or the hardware driver(like
1080 * device and endpoint feature flags, and their status). It's all
1081 * housekeeping for the gadget function we're implementing. Most of
1082 * the work is in config and function specific setup.
1085 composite_setup(struct usb_gadget
*gadget
, const struct usb_ctrlrequest
*ctrl
)
1087 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1088 struct usb_request
*req
= cdev
->req
;
1089 int value
= -EOPNOTSUPP
;
1091 u16 w_index
= le16_to_cpu(ctrl
->wIndex
);
1092 u8 intf
= w_index
& 0xFF;
1093 u16 w_value
= le16_to_cpu(ctrl
->wValue
);
1094 u16 w_length
= le16_to_cpu(ctrl
->wLength
);
1095 struct usb_function
*f
= NULL
;
1098 /* partial re-init of the response message; the function or the
1099 * gadget might need to intercept e.g. a control-OUT completion
1100 * when we delegate to it.
1103 req
->complete
= composite_setup_complete
;
1105 gadget
->ep0
->driver_data
= cdev
;
1107 switch (ctrl
->bRequest
) {
1109 /* we handle all standard USB descriptors */
1110 case USB_REQ_GET_DESCRIPTOR
:
1111 if (ctrl
->bRequestType
!= USB_DIR_IN
)
1113 switch (w_value
>> 8) {
1116 cdev
->desc
.bNumConfigurations
=
1117 count_configs(cdev
, USB_DT_DEVICE
);
1118 cdev
->desc
.bMaxPacketSize0
=
1119 cdev
->gadget
->ep0
->maxpacket
;
1120 if (gadget_is_superspeed(gadget
)) {
1121 if (gadget
->speed
>= USB_SPEED_SUPER
) {
1122 cdev
->desc
.bcdUSB
= cpu_to_le16(0x0300);
1123 cdev
->desc
.bMaxPacketSize0
= 9;
1125 cdev
->desc
.bcdUSB
= cpu_to_le16(0x0210);
1129 value
= min(w_length
, (u16
) sizeof cdev
->desc
);
1130 memcpy(req
->buf
, &cdev
->desc
, value
);
1132 case USB_DT_DEVICE_QUALIFIER
:
1133 if (!gadget_is_dualspeed(gadget
) ||
1134 gadget
->speed
>= USB_SPEED_SUPER
)
1137 value
= min_t(int, w_length
,
1138 sizeof(struct usb_qualifier_descriptor
));
1140 case USB_DT_OTHER_SPEED_CONFIG
:
1141 if (!gadget_is_dualspeed(gadget
) ||
1142 gadget
->speed
>= USB_SPEED_SUPER
)
1146 value
= config_desc(cdev
, w_value
);
1148 value
= min(w_length
, (u16
) value
);
1151 value
= get_string(cdev
, req
->buf
,
1152 w_index
, w_value
& 0xff);
1154 value
= min(w_length
, (u16
) value
);
1157 if (gadget_is_superspeed(gadget
)) {
1158 value
= bos_desc(cdev
);
1159 value
= min(w_length
, (u16
) value
);
1165 /* any number of configs can work */
1166 case USB_REQ_SET_CONFIGURATION
:
1167 if (ctrl
->bRequestType
!= 0)
1169 if (gadget_is_otg(gadget
)) {
1170 if (gadget
->a_hnp_support
)
1171 DBG(cdev
, "HNP available\n");
1172 else if (gadget
->a_alt_hnp_support
)
1173 DBG(cdev
, "HNP on another port\n");
1175 VDBG(cdev
, "HNP inactive\n");
1177 spin_lock(&cdev
->lock
);
1178 value
= set_config(cdev
, ctrl
, w_value
);
1179 spin_unlock(&cdev
->lock
);
1181 case USB_REQ_GET_CONFIGURATION
:
1182 if (ctrl
->bRequestType
!= USB_DIR_IN
)
1185 *(u8
*)req
->buf
= cdev
->config
->bConfigurationValue
;
1187 *(u8
*)req
->buf
= 0;
1188 value
= min(w_length
, (u16
) 1);
1191 /* function drivers must handle get/set altsetting; if there's
1192 * no get() method, we know only altsetting zero works.
1194 case USB_REQ_SET_INTERFACE
:
1195 if (ctrl
->bRequestType
!= USB_RECIP_INTERFACE
)
1197 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1199 f
= cdev
->config
->interface
[intf
];
1202 if (w_value
&& !f
->set_alt
)
1204 value
= f
->set_alt(f
, w_index
, w_value
);
1205 if (value
== USB_GADGET_DELAYED_STATUS
) {
1207 "%s: interface %d (%s) requested delayed status\n",
1208 __func__
, intf
, f
->name
);
1209 cdev
->delayed_status
++;
1210 DBG(cdev
, "delayed_status count %d\n",
1211 cdev
->delayed_status
);
1214 case USB_REQ_GET_INTERFACE
:
1215 if (ctrl
->bRequestType
!= (USB_DIR_IN
|USB_RECIP_INTERFACE
))
1217 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1219 f
= cdev
->config
->interface
[intf
];
1222 /* lots of interfaces only need altsetting zero... */
1223 value
= f
->get_alt
? f
->get_alt(f
, w_index
) : 0;
1226 *((u8
*)req
->buf
) = value
;
1227 value
= min(w_length
, (u16
) 1);
1231 * USB 3.0 additions:
1232 * Function driver should handle get_status request. If such cb
1233 * wasn't supplied we respond with default value = 0
1234 * Note: function driver should supply such cb only for the first
1235 * interface of the function
1237 case USB_REQ_GET_STATUS
:
1238 if (!gadget_is_superspeed(gadget
))
1240 if (ctrl
->bRequestType
!= (USB_DIR_IN
| USB_RECIP_INTERFACE
))
1242 value
= 2; /* This is the length of the get_status reply */
1243 put_unaligned_le16(0, req
->buf
);
1244 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1246 f
= cdev
->config
->interface
[intf
];
1249 status
= f
->get_status
? f
->get_status(f
) : 0;
1252 put_unaligned_le16(status
& 0x0000ffff, req
->buf
);
1255 * Function drivers should handle SetFeature/ClearFeature
1256 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
1257 * only for the first interface of the function
1259 case USB_REQ_CLEAR_FEATURE
:
1260 case USB_REQ_SET_FEATURE
:
1261 if (!gadget_is_superspeed(gadget
))
1263 if (ctrl
->bRequestType
!= (USB_DIR_OUT
| USB_RECIP_INTERFACE
))
1266 case USB_INTRF_FUNC_SUSPEND
:
1267 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1269 f
= cdev
->config
->interface
[intf
];
1273 if (f
->func_suspend
)
1274 value
= f
->func_suspend(f
, w_index
>> 8);
1277 "func_suspend() returned error %d\n",
1287 "non-core control req%02x.%02x v%04x i%04x l%d\n",
1288 ctrl
->bRequestType
, ctrl
->bRequest
,
1289 w_value
, w_index
, w_length
);
1291 /* functions always handle their interfaces and endpoints...
1292 * punt other recipients (other, WUSB, ...) to the current
1293 * configuration code.
1295 * REVISIT it could make sense to let the composite device
1296 * take such requests too, if that's ever needed: to work
1299 switch (ctrl
->bRequestType
& USB_RECIP_MASK
) {
1300 case USB_RECIP_INTERFACE
:
1301 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1303 f
= cdev
->config
->interface
[intf
];
1306 case USB_RECIP_ENDPOINT
:
1307 endp
= ((w_index
& 0x80) >> 3) | (w_index
& 0x0f);
1308 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
1309 if (test_bit(endp
, f
->endpoints
))
1312 if (&f
->list
== &cdev
->config
->functions
)
1318 value
= f
->setup(f
, ctrl
);
1320 struct usb_configuration
*c
;
1324 value
= c
->setup(c
, ctrl
);
1330 /* respond with data transfer before status phase? */
1331 if (value
>= 0 && value
!= USB_GADGET_DELAYED_STATUS
) {
1332 req
->length
= value
;
1333 req
->zero
= value
< w_length
;
1334 value
= usb_ep_queue(gadget
->ep0
, req
, GFP_ATOMIC
);
1336 DBG(cdev
, "ep_queue --> %d\n", value
);
1338 composite_setup_complete(gadget
->ep0
, req
);
1340 } else if (value
== USB_GADGET_DELAYED_STATUS
&& w_length
!= 0) {
1342 "%s: Delayed status not supported for w_length != 0",
1347 /* device either stalls (value < 0) or reports success */
1351 static void composite_disconnect(struct usb_gadget
*gadget
)
1353 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1354 unsigned long flags
;
1356 /* REVISIT: should we have config and device level
1357 * disconnect callbacks?
1359 spin_lock_irqsave(&cdev
->lock
, flags
);
1362 if (composite
->disconnect
)
1363 composite
->disconnect(cdev
);
1364 spin_unlock_irqrestore(&cdev
->lock
, flags
);
1367 /*-------------------------------------------------------------------------*/
1369 static ssize_t
composite_show_suspended(struct device
*dev
,
1370 struct device_attribute
*attr
,
1373 struct usb_gadget
*gadget
= dev_to_usb_gadget(dev
);
1374 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1376 return sprintf(buf
, "%d\n", cdev
->suspended
);
1379 static DEVICE_ATTR(suspended
, 0444, composite_show_suspended
, NULL
);
1382 composite_unbind(struct usb_gadget
*gadget
)
1384 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1386 /* composite_disconnect() must already have been called
1387 * by the underlying peripheral controller driver!
1388 * so there's no i/o concurrency that could affect the
1389 * state protected by cdev->lock.
1391 WARN_ON(cdev
->config
);
1393 while (!list_empty(&cdev
->configs
)) {
1394 struct usb_configuration
*c
;
1395 c
= list_first_entry(&cdev
->configs
,
1396 struct usb_configuration
, list
);
1397 remove_config(cdev
, c
);
1399 if (composite
->unbind
)
1400 composite
->unbind(cdev
);
1403 kfree(cdev
->req
->buf
);
1404 usb_ep_free_request(gadget
->ep0
, cdev
->req
);
1406 device_remove_file(&gadget
->dev
, &dev_attr_suspended
);
1408 set_gadget_data(gadget
, NULL
);
1412 static u8
override_id(struct usb_composite_dev
*cdev
, u8
*desc
)
1415 int ret
= usb_string_id(cdev
);
1416 if (unlikely(ret
< 0))
1417 WARNING(cdev
, "failed to override string ID\n");
1425 static int composite_bind(struct usb_gadget
*gadget
)
1427 struct usb_composite_dev
*cdev
;
1428 int status
= -ENOMEM
;
1430 cdev
= kzalloc(sizeof *cdev
, GFP_KERNEL
);
1434 spin_lock_init(&cdev
->lock
);
1435 cdev
->gadget
= gadget
;
1436 set_gadget_data(gadget
, cdev
);
1437 INIT_LIST_HEAD(&cdev
->configs
);
1439 /* preallocate control response and buffer */
1440 cdev
->req
= usb_ep_alloc_request(gadget
->ep0
, GFP_KERNEL
);
1443 cdev
->req
->buf
= kmalloc(USB_BUFSIZ
, GFP_KERNEL
);
1444 if (!cdev
->req
->buf
)
1446 cdev
->req
->complete
= composite_setup_complete
;
1447 gadget
->ep0
->driver_data
= cdev
;
1449 cdev
->bufsiz
= USB_BUFSIZ
;
1450 cdev
->driver
= composite
;
1453 * As per USB compliance update, a device that is actively drawing
1454 * more than 100mA from USB must report itself as bus-powered in
1455 * the GetStatus(DEVICE) call.
1457 if (CONFIG_USB_GADGET_VBUS_DRAW
<= USB_SELF_POWER_VBUS_MAX_DRAW
)
1458 usb_gadget_set_selfpowered(gadget
);
1460 /* interface and string IDs start at zero via kzalloc.
1461 * we force endpoints to start unassigned; few controller
1462 * drivers will zero ep->driver_data.
1464 usb_ep_autoconfig_reset(cdev
->gadget
);
1466 /* composite gadget needs to assign strings for whole device (like
1467 * serial number), register function drivers, potentially update
1468 * power state and consumption, etc
1470 status
= composite_gadget_bind(cdev
);
1474 cdev
->desc
= *composite
->dev
;
1476 /* standardized runtime overrides for device ID data */
1478 cdev
->desc
.idVendor
= cpu_to_le16(idVendor
);
1480 idVendor
= le16_to_cpu(cdev
->desc
.idVendor
);
1482 cdev
->desc
.idProduct
= cpu_to_le16(idProduct
);
1484 idProduct
= le16_to_cpu(cdev
->desc
.idProduct
);
1486 cdev
->desc
.bcdDevice
= cpu_to_le16(bcdDevice
);
1488 bcdDevice
= le16_to_cpu(cdev
->desc
.bcdDevice
);
1490 /* string overrides */
1491 if (iManufacturer
|| !cdev
->desc
.iManufacturer
) {
1492 if (!iManufacturer
&& !composite
->iManufacturer
&&
1493 !*composite_manufacturer
)
1494 snprintf(composite_manufacturer
,
1495 sizeof composite_manufacturer
,
1497 init_utsname()->sysname
,
1498 init_utsname()->release
,
1501 cdev
->manufacturer_override
=
1502 override_id(cdev
, &cdev
->desc
.iManufacturer
);
1505 if (iProduct
|| (!cdev
->desc
.iProduct
&& composite
->iProduct
))
1506 cdev
->product_override
=
1507 override_id(cdev
, &cdev
->desc
.iProduct
);
1509 if (iSerialNumber
||
1510 (!cdev
->desc
.iSerialNumber
&& composite
->iSerialNumber
))
1511 cdev
->serial_override
=
1512 override_id(cdev
, &cdev
->desc
.iSerialNumber
);
1514 /* has userspace failed to provide a serial number? */
1515 if (composite
->needs_serial
&& !cdev
->desc
.iSerialNumber
)
1516 WARNING(cdev
, "userspace failed to provide iSerialNumber\n");
1519 status
= device_create_file(&gadget
->dev
, &dev_attr_suspended
);
1523 INFO(cdev
, "%s ready\n", composite
->name
);
1527 composite_unbind(gadget
);
1531 /*-------------------------------------------------------------------------*/
1534 composite_suspend(struct usb_gadget
*gadget
)
1536 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1537 struct usb_function
*f
;
1539 /* REVISIT: should we have config level
1540 * suspend/resume callbacks?
1542 DBG(cdev
, "suspend\n");
1544 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
1549 if (composite
->suspend
)
1550 composite
->suspend(cdev
);
1552 cdev
->suspended
= 1;
1554 usb_gadget_vbus_draw(gadget
, 2);
1558 composite_resume(struct usb_gadget
*gadget
)
1560 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1561 struct usb_function
*f
;
1564 /* REVISIT: should we have config level
1565 * suspend/resume callbacks?
1567 DBG(cdev
, "resume\n");
1568 if (composite
->resume
)
1569 composite
->resume(cdev
);
1571 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
1576 maxpower
= cdev
->config
->bMaxPower
;
1578 usb_gadget_vbus_draw(gadget
, maxpower
?
1579 (2 * maxpower
) : CONFIG_USB_GADGET_VBUS_DRAW
);
1582 cdev
->suspended
= 0;
1585 /*-------------------------------------------------------------------------*/
1587 static struct usb_gadget_driver composite_driver
= {
1588 #ifdef CONFIG_USB_GADGET_SUPERSPEED
1589 .max_speed
= USB_SPEED_SUPER
,
1591 .max_speed
= USB_SPEED_HIGH
,
1594 .unbind
= composite_unbind
,
1596 .setup
= composite_setup
,
1597 .disconnect
= composite_disconnect
,
1599 .suspend
= composite_suspend
,
1600 .resume
= composite_resume
,
1603 .owner
= THIS_MODULE
,
1608 * usb_composite_probe() - register a composite driver
1609 * @driver: the driver to register
1610 * @bind: the callback used to allocate resources that are shared across the
1611 * whole device, such as string IDs, and add its configurations using
1612 * @usb_add_config(). This may fail by returning a negative errno
1613 * value; it should return zero on successful initialization.
1614 * Context: single threaded during gadget setup
1616 * This function is used to register drivers using the composite driver
1617 * framework. The return value is zero, or a negative errno value.
1618 * Those values normally come from the driver's @bind method, which does
1619 * all the work of setting up the driver to match the hardware.
1621 * On successful return, the gadget is ready to respond to requests from
1622 * the host, unless one of its components invokes usb_gadget_disconnect()
1623 * while it was binding. That would usually be done in order to wait for
1624 * some userspace participation.
1626 int usb_composite_probe(struct usb_composite_driver
*driver
,
1627 int (*bind
)(struct usb_composite_dev
*cdev
))
1629 if (!driver
|| !driver
->dev
|| !bind
|| composite
)
1633 driver
->name
= "composite";
1634 if (!driver
->iProduct
)
1635 driver
->iProduct
= driver
->name
;
1636 composite_driver
.function
= (char *) driver
->name
;
1637 composite_driver
.driver
.name
= driver
->name
;
1638 composite_driver
.max_speed
=
1639 min_t(u8
, composite_driver
.max_speed
, driver
->max_speed
);
1641 composite_gadget_bind
= bind
;
1643 return usb_gadget_probe_driver(&composite_driver
, composite_bind
);
1647 * usb_composite_unregister() - unregister a composite driver
1648 * @driver: the driver to unregister
1650 * This function is used to unregister drivers using the composite
1653 void usb_composite_unregister(struct usb_composite_driver
*driver
)
1655 if (composite
!= driver
)
1657 usb_gadget_unregister_driver(&composite_driver
);
1661 * usb_composite_setup_continue() - Continue with the control transfer
1662 * @cdev: the composite device who's control transfer was kept waiting
1664 * This function must be called by the USB function driver to continue
1665 * with the control transfer's data/status stage in case it had requested to
1666 * delay the data/status stages. A USB function's setup handler (e.g. set_alt())
1667 * can request the composite framework to delay the setup request's data/status
1668 * stages by returning USB_GADGET_DELAYED_STATUS.
1670 void usb_composite_setup_continue(struct usb_composite_dev
*cdev
)
1673 struct usb_request
*req
= cdev
->req
;
1674 unsigned long flags
;
1676 DBG(cdev
, "%s\n", __func__
);
1677 spin_lock_irqsave(&cdev
->lock
, flags
);
1679 if (cdev
->delayed_status
== 0) {
1680 WARN(cdev
, "%s: Unexpected call\n", __func__
);
1682 } else if (--cdev
->delayed_status
== 0) {
1683 DBG(cdev
, "%s: Completing delayed status\n", __func__
);
1685 value
= usb_ep_queue(cdev
->gadget
->ep0
, req
, GFP_ATOMIC
);
1687 DBG(cdev
, "ep_queue --> %d\n", value
);
1689 composite_setup_complete(cdev
->gadget
->ep0
, req
);
1693 spin_unlock_irqrestore(&cdev
->lock
, flags
);