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
, 0);
44 MODULE_PARM_DESC(idVendor
, "USB Vendor ID");
46 static ushort idProduct
;
47 module_param(idProduct
, ushort
, 0);
48 MODULE_PARM_DESC(idProduct
, "USB Product ID");
50 static ushort bcdDevice
;
51 module_param(bcdDevice
, ushort
, 0);
52 MODULE_PARM_DESC(bcdDevice
, "USB Device version (BCD)");
54 static char *iManufacturer
;
55 module_param(iManufacturer
, charp
, 0);
56 MODULE_PARM_DESC(iManufacturer
, "USB Manufacturer string");
58 static char *iProduct
;
59 module_param(iProduct
, charp
, 0);
60 MODULE_PARM_DESC(iProduct
, "USB Product string");
62 static char *iSerialNumber
;
63 module_param(iSerialNumber
, charp
, 0);
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_endpoint_descriptor
*chosen_desc
= NULL
;
121 struct usb_descriptor_header
**speed_desc
= NULL
;
123 struct usb_ss_ep_comp_descriptor
*comp_desc
= NULL
;
124 int want_comp_desc
= 0;
126 struct usb_descriptor_header
**d_spd
; /* cursor for speed desc */
128 if (!g
|| !f
|| !_ep
)
131 /* select desired speed */
133 case USB_SPEED_SUPER
:
134 if (gadget_is_superspeed(g
)) {
135 speed_desc
= f
->ss_descriptors
;
139 /* else: Fall trough */
141 if (gadget_is_dualspeed(g
)) {
142 speed_desc
= f
->hs_descriptors
;
145 /* else: fall through */
147 speed_desc
= f
->descriptors
;
149 /* find descriptors */
150 for_each_ep_desc(speed_desc
, d_spd
) {
151 chosen_desc
= (struct usb_endpoint_descriptor
*)*d_spd
;
152 if (chosen_desc
->bEndpointAddress
== _ep
->address
)
159 _ep
->maxpacket
= usb_endpoint_maxp(chosen_desc
);
160 _ep
->desc
= chosen_desc
;
161 _ep
->comp_desc
= NULL
;
168 * Companion descriptor should follow EP descriptor
169 * USB 3.0 spec, #9.6.7
171 comp_desc
= (struct usb_ss_ep_comp_descriptor
*)*(++d_spd
);
173 (comp_desc
->bDescriptorType
!= USB_DT_SS_ENDPOINT_COMP
))
175 _ep
->comp_desc
= comp_desc
;
176 if (g
->speed
== USB_SPEED_SUPER
) {
177 switch (usb_endpoint_type(_ep
->desc
)) {
178 case USB_ENDPOINT_XFER_ISOC
:
179 /* mult: bits 1:0 of bmAttributes */
180 _ep
->mult
= comp_desc
->bmAttributes
& 0x3;
181 case USB_ENDPOINT_XFER_BULK
:
182 case USB_ENDPOINT_XFER_INT
:
183 _ep
->maxburst
= comp_desc
->bMaxBurst
;
186 /* Do nothing for control endpoints */
194 * usb_add_function() - add a function to a configuration
195 * @config: the configuration
196 * @function: the function being added
197 * Context: single threaded during gadget setup
199 * After initialization, each configuration must have one or more
200 * functions added to it. Adding a function involves calling its @bind()
201 * method to allocate resources such as interface and string identifiers
204 * This function returns the value of the function's bind(), which is
205 * zero for success else a negative errno value.
207 int usb_add_function(struct usb_configuration
*config
,
208 struct usb_function
*function
)
212 DBG(config
->cdev
, "adding '%s'/%p to config '%s'/%p\n",
213 function
->name
, function
,
214 config
->label
, config
);
216 if (!function
->set_alt
|| !function
->disable
)
219 function
->config
= config
;
220 list_add_tail(&function
->list
, &config
->functions
);
222 /* REVISIT *require* function->bind? */
223 if (function
->bind
) {
224 value
= function
->bind(config
, function
);
226 list_del(&function
->list
);
227 function
->config
= NULL
;
232 /* We allow configurations that don't work at both speeds.
233 * If we run into a lowspeed Linux system, treat it the same
234 * as full speed ... it's the function drivers that will need
235 * to avoid bulk and ISO transfers.
237 if (!config
->fullspeed
&& function
->descriptors
)
238 config
->fullspeed
= true;
239 if (!config
->highspeed
&& function
->hs_descriptors
)
240 config
->highspeed
= true;
241 if (!config
->superspeed
&& function
->ss_descriptors
)
242 config
->superspeed
= true;
246 DBG(config
->cdev
, "adding '%s'/%p --> %d\n",
247 function
->name
, function
, value
);
252 * usb_function_deactivate - prevent function and gadget enumeration
253 * @function: the function that isn't yet ready to respond
255 * Blocks response of the gadget driver to host enumeration by
256 * preventing the data line pullup from being activated. This is
257 * normally called during @bind() processing to change from the
258 * initial "ready to respond" state, or when a required resource
261 * For example, drivers that serve as a passthrough to a userspace
262 * daemon can block enumeration unless that daemon (such as an OBEX,
263 * MTP, or print server) is ready to handle host requests.
265 * Not all systems support software control of their USB peripheral
268 * Returns zero on success, else negative errno.
270 int usb_function_deactivate(struct usb_function
*function
)
272 struct usb_composite_dev
*cdev
= function
->config
->cdev
;
276 spin_lock_irqsave(&cdev
->lock
, flags
);
278 if (cdev
->deactivations
== 0)
279 status
= usb_gadget_disconnect(cdev
->gadget
);
281 cdev
->deactivations
++;
283 spin_unlock_irqrestore(&cdev
->lock
, flags
);
288 * usb_function_activate - allow function and gadget enumeration
289 * @function: function on which usb_function_activate() was called
291 * Reverses effect of usb_function_deactivate(). If no more functions
292 * are delaying their activation, the gadget driver will respond to
293 * host enumeration procedures.
295 * Returns zero on success, else negative errno.
297 int usb_function_activate(struct usb_function
*function
)
299 struct usb_composite_dev
*cdev
= function
->config
->cdev
;
302 spin_lock(&cdev
->lock
);
304 if (WARN_ON(cdev
->deactivations
== 0))
307 cdev
->deactivations
--;
308 if (cdev
->deactivations
== 0)
309 status
= usb_gadget_connect(cdev
->gadget
);
312 spin_unlock(&cdev
->lock
);
317 * usb_interface_id() - allocate an unused interface ID
318 * @config: configuration associated with the interface
319 * @function: function handling the interface
320 * Context: single threaded during gadget setup
322 * usb_interface_id() is called from usb_function.bind() callbacks to
323 * allocate new interface IDs. The function driver will then store that
324 * ID in interface, association, CDC union, and other descriptors. It
325 * will also handle any control requests targeted at that interface,
326 * particularly changing its altsetting via set_alt(). There may
327 * also be class-specific or vendor-specific requests to handle.
329 * All interface identifier should be allocated using this routine, to
330 * ensure that for example different functions don't wrongly assign
331 * different meanings to the same identifier. Note that since interface
332 * identifiers are configuration-specific, functions used in more than
333 * one configuration (or more than once in a given configuration) need
334 * multiple versions of the relevant descriptors.
336 * Returns the interface ID which was allocated; or -ENODEV if no
337 * more interface IDs can be allocated.
339 int usb_interface_id(struct usb_configuration
*config
,
340 struct usb_function
*function
)
342 unsigned id
= config
->next_interface_id
;
344 if (id
< MAX_CONFIG_INTERFACES
) {
345 config
->interface
[id
] = function
;
346 config
->next_interface_id
= id
+ 1;
352 static int config_buf(struct usb_configuration
*config
,
353 enum usb_device_speed speed
, void *buf
, u8 type
)
355 struct usb_config_descriptor
*c
= buf
;
356 void *next
= buf
+ USB_DT_CONFIG_SIZE
;
357 int len
= USB_BUFSIZ
- USB_DT_CONFIG_SIZE
;
358 struct usb_function
*f
;
361 /* write the config descriptor */
363 c
->bLength
= USB_DT_CONFIG_SIZE
;
364 c
->bDescriptorType
= type
;
365 /* wTotalLength is written later */
366 c
->bNumInterfaces
= config
->next_interface_id
;
367 c
->bConfigurationValue
= config
->bConfigurationValue
;
368 c
->iConfiguration
= config
->iConfiguration
;
369 c
->bmAttributes
= USB_CONFIG_ATT_ONE
| config
->bmAttributes
;
370 c
->bMaxPower
= config
->bMaxPower
? : (CONFIG_USB_GADGET_VBUS_DRAW
/ 2);
372 /* There may be e.g. OTG descriptors */
373 if (config
->descriptors
) {
374 status
= usb_descriptor_fillbuf(next
, len
,
375 config
->descriptors
);
382 /* add each function's descriptors */
383 list_for_each_entry(f
, &config
->functions
, list
) {
384 struct usb_descriptor_header
**descriptors
;
387 case USB_SPEED_SUPER
:
388 descriptors
= f
->ss_descriptors
;
391 descriptors
= f
->hs_descriptors
;
394 descriptors
= f
->descriptors
;
399 status
= usb_descriptor_fillbuf(next
, len
,
400 (const struct usb_descriptor_header
**) descriptors
);
408 c
->wTotalLength
= cpu_to_le16(len
);
412 static int config_desc(struct usb_composite_dev
*cdev
, unsigned w_value
)
414 struct usb_gadget
*gadget
= cdev
->gadget
;
415 struct usb_configuration
*c
;
416 u8 type
= w_value
>> 8;
417 enum usb_device_speed speed
= USB_SPEED_UNKNOWN
;
419 if (gadget
->speed
== USB_SPEED_SUPER
)
420 speed
= gadget
->speed
;
421 else if (gadget_is_dualspeed(gadget
)) {
423 if (gadget
->speed
== USB_SPEED_HIGH
)
425 if (type
== USB_DT_OTHER_SPEED_CONFIG
)
428 speed
= USB_SPEED_HIGH
;
432 /* This is a lookup by config *INDEX* */
434 list_for_each_entry(c
, &cdev
->configs
, list
) {
435 /* ignore configs that won't work at this speed */
437 case USB_SPEED_SUPER
:
451 return config_buf(c
, speed
, cdev
->req
->buf
, type
);
457 static int count_configs(struct usb_composite_dev
*cdev
, unsigned type
)
459 struct usb_gadget
*gadget
= cdev
->gadget
;
460 struct usb_configuration
*c
;
465 if (gadget_is_dualspeed(gadget
)) {
466 if (gadget
->speed
== USB_SPEED_HIGH
)
468 if (gadget
->speed
== USB_SPEED_SUPER
)
470 if (type
== USB_DT_DEVICE_QUALIFIER
)
473 list_for_each_entry(c
, &cdev
->configs
, list
) {
474 /* ignore configs that won't work at this speed */
491 * bos_desc() - prepares the BOS descriptor.
492 * @cdev: pointer to usb_composite device to generate the bos
495 * This function generates the BOS (Binary Device Object)
496 * descriptor and its device capabilities descriptors. The BOS
497 * descriptor should be supported by a SuperSpeed device.
499 static int bos_desc(struct usb_composite_dev
*cdev
)
501 struct usb_ext_cap_descriptor
*usb_ext
;
502 struct usb_ss_cap_descriptor
*ss_cap
;
503 struct usb_dcd_config_params dcd_config_params
;
504 struct usb_bos_descriptor
*bos
= cdev
->req
->buf
;
506 bos
->bLength
= USB_DT_BOS_SIZE
;
507 bos
->bDescriptorType
= USB_DT_BOS
;
509 bos
->wTotalLength
= cpu_to_le16(USB_DT_BOS_SIZE
);
510 bos
->bNumDeviceCaps
= 0;
513 * A SuperSpeed device shall include the USB2.0 extension descriptor
514 * and shall support LPM when operating in USB2.0 HS mode.
516 usb_ext
= cdev
->req
->buf
+ le16_to_cpu(bos
->wTotalLength
);
517 bos
->bNumDeviceCaps
++;
518 le16_add_cpu(&bos
->wTotalLength
, USB_DT_USB_EXT_CAP_SIZE
);
519 usb_ext
->bLength
= USB_DT_USB_EXT_CAP_SIZE
;
520 usb_ext
->bDescriptorType
= USB_DT_DEVICE_CAPABILITY
;
521 usb_ext
->bDevCapabilityType
= USB_CAP_TYPE_EXT
;
522 usb_ext
->bmAttributes
= cpu_to_le32(USB_LPM_SUPPORT
);
525 * The Superspeed USB Capability descriptor shall be implemented by all
526 * SuperSpeed devices.
528 ss_cap
= cdev
->req
->buf
+ le16_to_cpu(bos
->wTotalLength
);
529 bos
->bNumDeviceCaps
++;
530 le16_add_cpu(&bos
->wTotalLength
, USB_DT_USB_SS_CAP_SIZE
);
531 ss_cap
->bLength
= USB_DT_USB_SS_CAP_SIZE
;
532 ss_cap
->bDescriptorType
= USB_DT_DEVICE_CAPABILITY
;
533 ss_cap
->bDevCapabilityType
= USB_SS_CAP_TYPE
;
534 ss_cap
->bmAttributes
= 0; /* LTM is not supported yet */
535 ss_cap
->wSpeedSupported
= cpu_to_le16(USB_LOW_SPEED_OPERATION
|
536 USB_FULL_SPEED_OPERATION
|
537 USB_HIGH_SPEED_OPERATION
|
538 USB_5GBPS_OPERATION
);
539 ss_cap
->bFunctionalitySupport
= USB_LOW_SPEED_OPERATION
;
541 /* Get Controller configuration */
542 if (cdev
->gadget
->ops
->get_config_params
)
543 cdev
->gadget
->ops
->get_config_params(&dcd_config_params
);
545 dcd_config_params
.bU1devExitLat
= USB_DEFAULT_U1_DEV_EXIT_LAT
;
546 dcd_config_params
.bU2DevExitLat
=
547 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT
);
549 ss_cap
->bU1devExitLat
= dcd_config_params
.bU1devExitLat
;
550 ss_cap
->bU2DevExitLat
= dcd_config_params
.bU2DevExitLat
;
552 return le16_to_cpu(bos
->wTotalLength
);
555 static void device_qual(struct usb_composite_dev
*cdev
)
557 struct usb_qualifier_descriptor
*qual
= cdev
->req
->buf
;
559 qual
->bLength
= sizeof(*qual
);
560 qual
->bDescriptorType
= USB_DT_DEVICE_QUALIFIER
;
561 /* POLICY: same bcdUSB and device type info at both speeds */
562 qual
->bcdUSB
= cdev
->desc
.bcdUSB
;
563 qual
->bDeviceClass
= cdev
->desc
.bDeviceClass
;
564 qual
->bDeviceSubClass
= cdev
->desc
.bDeviceSubClass
;
565 qual
->bDeviceProtocol
= cdev
->desc
.bDeviceProtocol
;
566 /* ASSUME same EP0 fifo size at both speeds */
567 qual
->bMaxPacketSize0
= cdev
->gadget
->ep0
->maxpacket
;
568 qual
->bNumConfigurations
= count_configs(cdev
, USB_DT_DEVICE_QUALIFIER
);
572 /*-------------------------------------------------------------------------*/
574 static void reset_config(struct usb_composite_dev
*cdev
)
576 struct usb_function
*f
;
578 DBG(cdev
, "reset config\n");
580 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
584 bitmap_zero(f
->endpoints
, 32);
589 static int set_config(struct usb_composite_dev
*cdev
,
590 const struct usb_ctrlrequest
*ctrl
, unsigned number
)
592 struct usb_gadget
*gadget
= cdev
->gadget
;
593 struct usb_configuration
*c
= NULL
;
594 int result
= -EINVAL
;
595 unsigned power
= gadget_is_otg(gadget
) ? 8 : 100;
599 list_for_each_entry(c
, &cdev
->configs
, list
) {
600 if (c
->bConfigurationValue
== number
) {
602 * We disable the FDs of the previous
603 * configuration only if the new configuration
614 } else { /* Zero configuration value - need to reset the config */
620 INFO(cdev
, "%s config #%d: %s\n",
621 usb_speed_string(gadget
->speed
),
622 number
, c
? c
->label
: "unconfigured");
629 /* Initialize all interfaces by setting them to altsetting zero. */
630 for (tmp
= 0; tmp
< MAX_CONFIG_INTERFACES
; tmp
++) {
631 struct usb_function
*f
= c
->interface
[tmp
];
632 struct usb_descriptor_header
**descriptors
;
638 * Record which endpoints are used by the function. This is used
639 * to dispatch control requests targeted at that endpoint to the
640 * function's setup callback instead of the current
641 * configuration's setup callback.
643 switch (gadget
->speed
) {
644 case USB_SPEED_SUPER
:
645 descriptors
= f
->ss_descriptors
;
648 descriptors
= f
->hs_descriptors
;
651 descriptors
= f
->descriptors
;
654 for (; *descriptors
; ++descriptors
) {
655 struct usb_endpoint_descriptor
*ep
;
658 if ((*descriptors
)->bDescriptorType
!= USB_DT_ENDPOINT
)
661 ep
= (struct usb_endpoint_descriptor
*)*descriptors
;
662 addr
= ((ep
->bEndpointAddress
& 0x80) >> 3)
663 | (ep
->bEndpointAddress
& 0x0f);
664 set_bit(addr
, f
->endpoints
);
667 result
= f
->set_alt(f
, tmp
, 0);
669 DBG(cdev
, "interface %d (%s/%p) alt 0 --> %d\n",
670 tmp
, f
->name
, f
, result
);
676 if (result
== USB_GADGET_DELAYED_STATUS
) {
678 "%s: interface %d (%s) requested delayed status\n",
679 __func__
, tmp
, f
->name
);
680 cdev
->delayed_status
++;
681 DBG(cdev
, "delayed_status count %d\n",
682 cdev
->delayed_status
);
686 /* when we return, be sure our power usage is valid */
687 power
= c
->bMaxPower
? (2 * c
->bMaxPower
) : CONFIG_USB_GADGET_VBUS_DRAW
;
689 usb_gadget_vbus_draw(gadget
, power
);
690 if (result
>= 0 && cdev
->delayed_status
)
691 result
= USB_GADGET_DELAYED_STATUS
;
696 * usb_add_config() - add a configuration to a device.
697 * @cdev: wraps the USB gadget
698 * @config: the configuration, with bConfigurationValue assigned
699 * @bind: the configuration's bind function
700 * Context: single threaded during gadget setup
702 * One of the main tasks of a composite @bind() routine is to
703 * add each of the configurations it supports, using this routine.
705 * This function returns the value of the configuration's @bind(), which
706 * is zero for success else a negative errno value. Binding configurations
707 * assigns global resources including string IDs, and per-configuration
708 * resources such as interface IDs and endpoints.
710 int usb_add_config(struct usb_composite_dev
*cdev
,
711 struct usb_configuration
*config
,
712 int (*bind
)(struct usb_configuration
*))
714 int status
= -EINVAL
;
715 struct usb_configuration
*c
;
717 DBG(cdev
, "adding config #%u '%s'/%p\n",
718 config
->bConfigurationValue
,
719 config
->label
, config
);
721 if (!config
->bConfigurationValue
|| !bind
)
724 /* Prevent duplicate configuration identifiers */
725 list_for_each_entry(c
, &cdev
->configs
, list
) {
726 if (c
->bConfigurationValue
== config
->bConfigurationValue
) {
733 list_add_tail(&config
->list
, &cdev
->configs
);
735 INIT_LIST_HEAD(&config
->functions
);
736 config
->next_interface_id
= 0;
738 status
= bind(config
);
740 while (!list_empty(&config
->functions
)) {
741 struct usb_function
*f
;
743 f
= list_first_entry(&config
->functions
,
744 struct usb_function
, list
);
747 DBG(cdev
, "unbind function '%s'/%p\n",
749 f
->unbind(config
, f
);
750 /* may free memory for "f" */
753 list_del(&config
->list
);
758 DBG(cdev
, "cfg %d/%p speeds:%s%s%s\n",
759 config
->bConfigurationValue
, config
,
760 config
->superspeed
? " super" : "",
761 config
->highspeed
? " high" : "",
763 ? (gadget_is_dualspeed(cdev
->gadget
)
768 for (i
= 0; i
< MAX_CONFIG_INTERFACES
; i
++) {
769 struct usb_function
*f
= config
->interface
[i
];
773 DBG(cdev
, " interface %d = %s/%p\n",
778 /* set_alt(), or next bind(), sets up
779 * ep->driver_data as needed.
781 usb_ep_autoconfig_reset(cdev
->gadget
);
785 DBG(cdev
, "added config '%s'/%u --> %d\n", config
->label
,
786 config
->bConfigurationValue
, status
);
790 /*-------------------------------------------------------------------------*/
792 /* We support strings in multiple languages ... string descriptor zero
793 * says which languages are supported. The typical case will be that
794 * only one language (probably English) is used, with I18N handled on
798 static void collect_langs(struct usb_gadget_strings
**sp
, __le16
*buf
)
800 const struct usb_gadget_strings
*s
;
806 language
= cpu_to_le16(s
->language
);
807 for (tmp
= buf
; *tmp
&& tmp
< &buf
[126]; tmp
++) {
808 if (*tmp
== language
)
817 static int lookup_string(
818 struct usb_gadget_strings
**sp
,
824 struct usb_gadget_strings
*s
;
829 if (s
->language
!= language
)
831 value
= usb_gadget_get_string(s
, id
, buf
);
838 static int get_string(struct usb_composite_dev
*cdev
,
839 void *buf
, u16 language
, int id
)
841 struct usb_configuration
*c
;
842 struct usb_function
*f
;
846 /* Yes, not only is USB's I18N support probably more than most
847 * folk will ever care about ... also, it's all supported here.
848 * (Except for UTF8 support for Unicode's "Astral Planes".)
851 /* 0 == report all available language codes */
853 struct usb_string_descriptor
*s
= buf
;
854 struct usb_gadget_strings
**sp
;
857 s
->bDescriptorType
= USB_DT_STRING
;
859 sp
= composite
->strings
;
861 collect_langs(sp
, s
->wData
);
863 list_for_each_entry(c
, &cdev
->configs
, list
) {
866 collect_langs(sp
, s
->wData
);
868 list_for_each_entry(f
, &c
->functions
, list
) {
871 collect_langs(sp
, s
->wData
);
875 for (len
= 0; len
<= 126 && s
->wData
[len
]; len
++)
880 s
->bLength
= 2 * (len
+ 1);
884 /* Otherwise, look up and return a specified string. First
885 * check if the string has not been overridden.
887 if (cdev
->manufacturer_override
== id
)
888 str
= iManufacturer
?: composite
->iManufacturer
?:
889 composite_manufacturer
;
890 else if (cdev
->product_override
== id
)
891 str
= iProduct
?: composite
->iProduct
;
892 else if (cdev
->serial_override
== id
)
897 struct usb_gadget_strings strings
= {
898 .language
= language
,
899 .strings
= &(struct usb_string
) { 0xff, str
}
901 return usb_gadget_get_string(&strings
, 0xff, buf
);
904 /* String IDs are device-scoped, so we look up each string
905 * table we're told about. These lookups are infrequent;
906 * simpler-is-better here.
908 if (composite
->strings
) {
909 len
= lookup_string(composite
->strings
, buf
, language
, id
);
913 list_for_each_entry(c
, &cdev
->configs
, list
) {
915 len
= lookup_string(c
->strings
, buf
, language
, id
);
919 list_for_each_entry(f
, &c
->functions
, list
) {
922 len
= lookup_string(f
->strings
, buf
, language
, id
);
931 * usb_string_id() - allocate an unused string ID
932 * @cdev: the device whose string descriptor IDs are being allocated
933 * Context: single threaded during gadget setup
935 * @usb_string_id() is called from bind() callbacks to allocate
936 * string IDs. Drivers for functions, configurations, or gadgets will
937 * then store that ID in the appropriate descriptors and string table.
939 * All string identifier should be allocated using this,
940 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
941 * that for example different functions don't wrongly assign different
942 * meanings to the same identifier.
944 int usb_string_id(struct usb_composite_dev
*cdev
)
946 if (cdev
->next_string_id
< 254) {
947 /* string id 0 is reserved by USB spec for list of
948 * supported languages */
949 /* 255 reserved as well? -- mina86 */
950 cdev
->next_string_id
++;
951 return cdev
->next_string_id
;
957 * usb_string_ids() - allocate unused string IDs in batch
958 * @cdev: the device whose string descriptor IDs are being allocated
959 * @str: an array of usb_string objects to assign numbers to
960 * Context: single threaded during gadget setup
962 * @usb_string_ids() is called from bind() callbacks to allocate
963 * string IDs. Drivers for functions, configurations, or gadgets will
964 * then copy IDs from the string table to the appropriate descriptors
965 * and string table for other languages.
967 * All string identifier should be allocated using this,
968 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
969 * example different functions don't wrongly assign different meanings
970 * to the same identifier.
972 int usb_string_ids_tab(struct usb_composite_dev
*cdev
, struct usb_string
*str
)
974 int next
= cdev
->next_string_id
;
976 for (; str
->s
; ++str
) {
977 if (unlikely(next
>= 254))
982 cdev
->next_string_id
= next
;
988 * usb_string_ids_n() - allocate unused string IDs in batch
989 * @c: the device whose string descriptor IDs are being allocated
990 * @n: number of string IDs to allocate
991 * Context: single threaded during gadget setup
993 * Returns the first requested ID. This ID and next @n-1 IDs are now
994 * valid IDs. At least provided that @n is non-zero because if it
995 * is, returns last requested ID which is now very useful information.
997 * @usb_string_ids_n() is called from bind() callbacks to allocate
998 * string IDs. Drivers for functions, configurations, or gadgets will
999 * then store that ID in the appropriate descriptors and string table.
1001 * All string identifier should be allocated using this,
1002 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1003 * example different functions don't wrongly assign different meanings
1004 * to the same identifier.
1006 int usb_string_ids_n(struct usb_composite_dev
*c
, unsigned n
)
1008 unsigned next
= c
->next_string_id
;
1009 if (unlikely(n
> 254 || (unsigned)next
+ n
> 254))
1011 c
->next_string_id
+= n
;
1016 /*-------------------------------------------------------------------------*/
1018 static void composite_setup_complete(struct usb_ep
*ep
, struct usb_request
*req
)
1020 if (req
->status
|| req
->actual
!= req
->length
)
1021 DBG((struct usb_composite_dev
*) ep
->driver_data
,
1022 "setup complete --> %d, %d/%d\n",
1023 req
->status
, req
->actual
, req
->length
);
1027 * The setup() callback implements all the ep0 functionality that's
1028 * not handled lower down, in hardware or the hardware driver(like
1029 * device and endpoint feature flags, and their status). It's all
1030 * housekeeping for the gadget function we're implementing. Most of
1031 * the work is in config and function specific setup.
1034 composite_setup(struct usb_gadget
*gadget
, const struct usb_ctrlrequest
*ctrl
)
1036 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1037 struct usb_request
*req
= cdev
->req
;
1038 int value
= -EOPNOTSUPP
;
1040 u16 w_index
= le16_to_cpu(ctrl
->wIndex
);
1041 u8 intf
= w_index
& 0xFF;
1042 u16 w_value
= le16_to_cpu(ctrl
->wValue
);
1043 u16 w_length
= le16_to_cpu(ctrl
->wLength
);
1044 struct usb_function
*f
= NULL
;
1047 /* partial re-init of the response message; the function or the
1048 * gadget might need to intercept e.g. a control-OUT completion
1049 * when we delegate to it.
1052 req
->complete
= composite_setup_complete
;
1054 gadget
->ep0
->driver_data
= cdev
;
1056 switch (ctrl
->bRequest
) {
1058 /* we handle all standard USB descriptors */
1059 case USB_REQ_GET_DESCRIPTOR
:
1060 if (ctrl
->bRequestType
!= USB_DIR_IN
)
1062 switch (w_value
>> 8) {
1065 cdev
->desc
.bNumConfigurations
=
1066 count_configs(cdev
, USB_DT_DEVICE
);
1067 cdev
->desc
.bMaxPacketSize0
=
1068 cdev
->gadget
->ep0
->maxpacket
;
1069 if (gadget_is_superspeed(gadget
)) {
1070 if (gadget
->speed
>= USB_SPEED_SUPER
) {
1071 cdev
->desc
.bcdUSB
= cpu_to_le16(0x0300);
1072 cdev
->desc
.bMaxPacketSize0
= 9;
1074 cdev
->desc
.bcdUSB
= cpu_to_le16(0x0210);
1078 value
= min(w_length
, (u16
) sizeof cdev
->desc
);
1079 memcpy(req
->buf
, &cdev
->desc
, value
);
1081 case USB_DT_DEVICE_QUALIFIER
:
1082 if (!gadget_is_dualspeed(gadget
) ||
1083 gadget
->speed
>= USB_SPEED_SUPER
)
1086 value
= min_t(int, w_length
,
1087 sizeof(struct usb_qualifier_descriptor
));
1089 case USB_DT_OTHER_SPEED_CONFIG
:
1090 if (!gadget_is_dualspeed(gadget
) ||
1091 gadget
->speed
>= USB_SPEED_SUPER
)
1095 value
= config_desc(cdev
, w_value
);
1097 value
= min(w_length
, (u16
) value
);
1100 value
= get_string(cdev
, req
->buf
,
1101 w_index
, w_value
& 0xff);
1103 value
= min(w_length
, (u16
) value
);
1106 if (gadget_is_superspeed(gadget
)) {
1107 value
= bos_desc(cdev
);
1108 value
= min(w_length
, (u16
) value
);
1114 /* any number of configs can work */
1115 case USB_REQ_SET_CONFIGURATION
:
1116 if (ctrl
->bRequestType
!= 0)
1118 if (gadget_is_otg(gadget
)) {
1119 if (gadget
->a_hnp_support
)
1120 DBG(cdev
, "HNP available\n");
1121 else if (gadget
->a_alt_hnp_support
)
1122 DBG(cdev
, "HNP on another port\n");
1124 VDBG(cdev
, "HNP inactive\n");
1126 spin_lock(&cdev
->lock
);
1127 value
= set_config(cdev
, ctrl
, w_value
);
1128 spin_unlock(&cdev
->lock
);
1130 case USB_REQ_GET_CONFIGURATION
:
1131 if (ctrl
->bRequestType
!= USB_DIR_IN
)
1134 *(u8
*)req
->buf
= cdev
->config
->bConfigurationValue
;
1136 *(u8
*)req
->buf
= 0;
1137 value
= min(w_length
, (u16
) 1);
1140 /* function drivers must handle get/set altsetting; if there's
1141 * no get() method, we know only altsetting zero works.
1143 case USB_REQ_SET_INTERFACE
:
1144 if (ctrl
->bRequestType
!= USB_RECIP_INTERFACE
)
1146 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1148 f
= cdev
->config
->interface
[intf
];
1151 if (w_value
&& !f
->set_alt
)
1153 value
= f
->set_alt(f
, w_index
, w_value
);
1154 if (value
== USB_GADGET_DELAYED_STATUS
) {
1156 "%s: interface %d (%s) requested delayed status\n",
1157 __func__
, intf
, f
->name
);
1158 cdev
->delayed_status
++;
1159 DBG(cdev
, "delayed_status count %d\n",
1160 cdev
->delayed_status
);
1163 case USB_REQ_GET_INTERFACE
:
1164 if (ctrl
->bRequestType
!= (USB_DIR_IN
|USB_RECIP_INTERFACE
))
1166 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1168 f
= cdev
->config
->interface
[intf
];
1171 /* lots of interfaces only need altsetting zero... */
1172 value
= f
->get_alt
? f
->get_alt(f
, w_index
) : 0;
1175 *((u8
*)req
->buf
) = value
;
1176 value
= min(w_length
, (u16
) 1);
1180 * USB 3.0 additions:
1181 * Function driver should handle get_status request. If such cb
1182 * wasn't supplied we respond with default value = 0
1183 * Note: function driver should supply such cb only for the first
1184 * interface of the function
1186 case USB_REQ_GET_STATUS
:
1187 if (!gadget_is_superspeed(gadget
))
1189 if (ctrl
->bRequestType
!= (USB_DIR_IN
| USB_RECIP_INTERFACE
))
1191 value
= 2; /* This is the length of the get_status reply */
1192 put_unaligned_le16(0, req
->buf
);
1193 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1195 f
= cdev
->config
->interface
[intf
];
1198 status
= f
->get_status
? f
->get_status(f
) : 0;
1201 put_unaligned_le16(status
& 0x0000ffff, req
->buf
);
1204 * Function drivers should handle SetFeature/ClearFeature
1205 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
1206 * only for the first interface of the function
1208 case USB_REQ_CLEAR_FEATURE
:
1209 case USB_REQ_SET_FEATURE
:
1210 if (!gadget_is_superspeed(gadget
))
1212 if (ctrl
->bRequestType
!= (USB_DIR_OUT
| USB_RECIP_INTERFACE
))
1215 case USB_INTRF_FUNC_SUSPEND
:
1216 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1218 f
= cdev
->config
->interface
[intf
];
1222 if (f
->func_suspend
)
1223 value
= f
->func_suspend(f
, w_index
>> 8);
1226 "func_suspend() returned error %d\n",
1236 "non-core control req%02x.%02x v%04x i%04x l%d\n",
1237 ctrl
->bRequestType
, ctrl
->bRequest
,
1238 w_value
, w_index
, w_length
);
1240 /* functions always handle their interfaces and endpoints...
1241 * punt other recipients (other, WUSB, ...) to the current
1242 * configuration code.
1244 * REVISIT it could make sense to let the composite device
1245 * take such requests too, if that's ever needed: to work
1248 switch (ctrl
->bRequestType
& USB_RECIP_MASK
) {
1249 case USB_RECIP_INTERFACE
:
1250 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1252 f
= cdev
->config
->interface
[intf
];
1255 case USB_RECIP_ENDPOINT
:
1256 endp
= ((w_index
& 0x80) >> 3) | (w_index
& 0x0f);
1257 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
1258 if (test_bit(endp
, f
->endpoints
))
1261 if (&f
->list
== &cdev
->config
->functions
)
1267 value
= f
->setup(f
, ctrl
);
1269 struct usb_configuration
*c
;
1273 value
= c
->setup(c
, ctrl
);
1279 /* respond with data transfer before status phase? */
1280 if (value
>= 0 && value
!= USB_GADGET_DELAYED_STATUS
) {
1281 req
->length
= value
;
1282 req
->zero
= value
< w_length
;
1283 value
= usb_ep_queue(gadget
->ep0
, req
, GFP_ATOMIC
);
1285 DBG(cdev
, "ep_queue --> %d\n", value
);
1287 composite_setup_complete(gadget
->ep0
, req
);
1289 } else if (value
== USB_GADGET_DELAYED_STATUS
&& w_length
!= 0) {
1291 "%s: Delayed status not supported for w_length != 0",
1296 /* device either stalls (value < 0) or reports success */
1300 static void composite_disconnect(struct usb_gadget
*gadget
)
1302 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1303 unsigned long flags
;
1305 /* REVISIT: should we have config and device level
1306 * disconnect callbacks?
1308 spin_lock_irqsave(&cdev
->lock
, flags
);
1311 if (composite
->disconnect
)
1312 composite
->disconnect(cdev
);
1313 spin_unlock_irqrestore(&cdev
->lock
, flags
);
1316 /*-------------------------------------------------------------------------*/
1318 static ssize_t
composite_show_suspended(struct device
*dev
,
1319 struct device_attribute
*attr
,
1322 struct usb_gadget
*gadget
= dev_to_usb_gadget(dev
);
1323 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1325 return sprintf(buf
, "%d\n", cdev
->suspended
);
1328 static DEVICE_ATTR(suspended
, 0444, composite_show_suspended
, NULL
);
1331 composite_unbind(struct usb_gadget
*gadget
)
1333 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1335 /* composite_disconnect() must already have been called
1336 * by the underlying peripheral controller driver!
1337 * so there's no i/o concurrency that could affect the
1338 * state protected by cdev->lock.
1340 WARN_ON(cdev
->config
);
1342 while (!list_empty(&cdev
->configs
)) {
1343 struct usb_configuration
*c
;
1345 c
= list_first_entry(&cdev
->configs
,
1346 struct usb_configuration
, list
);
1347 while (!list_empty(&c
->functions
)) {
1348 struct usb_function
*f
;
1350 f
= list_first_entry(&c
->functions
,
1351 struct usb_function
, list
);
1354 DBG(cdev
, "unbind function '%s'/%p\n",
1357 /* may free memory for "f" */
1362 DBG(cdev
, "unbind config '%s'/%p\n", c
->label
, c
);
1364 /* may free memory for "c" */
1367 if (composite
->unbind
)
1368 composite
->unbind(cdev
);
1371 kfree(cdev
->req
->buf
);
1372 usb_ep_free_request(gadget
->ep0
, cdev
->req
);
1374 device_remove_file(&gadget
->dev
, &dev_attr_suspended
);
1376 set_gadget_data(gadget
, NULL
);
1380 static u8
override_id(struct usb_composite_dev
*cdev
, u8
*desc
)
1383 int ret
= usb_string_id(cdev
);
1384 if (unlikely(ret
< 0))
1385 WARNING(cdev
, "failed to override string ID\n");
1393 static int composite_bind(struct usb_gadget
*gadget
)
1395 struct usb_composite_dev
*cdev
;
1396 int status
= -ENOMEM
;
1398 cdev
= kzalloc(sizeof *cdev
, GFP_KERNEL
);
1402 spin_lock_init(&cdev
->lock
);
1403 cdev
->gadget
= gadget
;
1404 set_gadget_data(gadget
, cdev
);
1405 INIT_LIST_HEAD(&cdev
->configs
);
1407 /* preallocate control response and buffer */
1408 cdev
->req
= usb_ep_alloc_request(gadget
->ep0
, GFP_KERNEL
);
1411 cdev
->req
->buf
= kmalloc(USB_BUFSIZ
, GFP_KERNEL
);
1412 if (!cdev
->req
->buf
)
1414 cdev
->req
->complete
= composite_setup_complete
;
1415 gadget
->ep0
->driver_data
= cdev
;
1417 cdev
->bufsiz
= USB_BUFSIZ
;
1418 cdev
->driver
= composite
;
1421 * As per USB compliance update, a device that is actively drawing
1422 * more than 100mA from USB must report itself as bus-powered in
1423 * the GetStatus(DEVICE) call.
1425 if (CONFIG_USB_GADGET_VBUS_DRAW
<= USB_SELF_POWER_VBUS_MAX_DRAW
)
1426 usb_gadget_set_selfpowered(gadget
);
1428 /* interface and string IDs start at zero via kzalloc.
1429 * we force endpoints to start unassigned; few controller
1430 * drivers will zero ep->driver_data.
1432 usb_ep_autoconfig_reset(cdev
->gadget
);
1434 /* composite gadget needs to assign strings for whole device (like
1435 * serial number), register function drivers, potentially update
1436 * power state and consumption, etc
1438 status
= composite_gadget_bind(cdev
);
1442 cdev
->desc
= *composite
->dev
;
1444 /* standardized runtime overrides for device ID data */
1446 cdev
->desc
.idVendor
= cpu_to_le16(idVendor
);
1448 cdev
->desc
.idProduct
= cpu_to_le16(idProduct
);
1450 cdev
->desc
.bcdDevice
= cpu_to_le16(bcdDevice
);
1452 /* string overrides */
1453 if (iManufacturer
|| !cdev
->desc
.iManufacturer
) {
1454 if (!iManufacturer
&& !composite
->iManufacturer
&&
1455 !*composite_manufacturer
)
1456 snprintf(composite_manufacturer
,
1457 sizeof composite_manufacturer
,
1459 init_utsname()->sysname
,
1460 init_utsname()->release
,
1463 cdev
->manufacturer_override
=
1464 override_id(cdev
, &cdev
->desc
.iManufacturer
);
1467 if (iProduct
|| (!cdev
->desc
.iProduct
&& composite
->iProduct
))
1468 cdev
->product_override
=
1469 override_id(cdev
, &cdev
->desc
.iProduct
);
1472 cdev
->serial_override
=
1473 override_id(cdev
, &cdev
->desc
.iSerialNumber
);
1475 /* has userspace failed to provide a serial number? */
1476 if (composite
->needs_serial
&& !cdev
->desc
.iSerialNumber
)
1477 WARNING(cdev
, "userspace failed to provide iSerialNumber\n");
1480 status
= device_create_file(&gadget
->dev
, &dev_attr_suspended
);
1484 INFO(cdev
, "%s ready\n", composite
->name
);
1488 composite_unbind(gadget
);
1492 /*-------------------------------------------------------------------------*/
1495 composite_suspend(struct usb_gadget
*gadget
)
1497 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1498 struct usb_function
*f
;
1500 /* REVISIT: should we have config level
1501 * suspend/resume callbacks?
1503 DBG(cdev
, "suspend\n");
1505 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
1510 if (composite
->suspend
)
1511 composite
->suspend(cdev
);
1513 cdev
->suspended
= 1;
1515 usb_gadget_vbus_draw(gadget
, 2);
1519 composite_resume(struct usb_gadget
*gadget
)
1521 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1522 struct usb_function
*f
;
1525 /* REVISIT: should we have config level
1526 * suspend/resume callbacks?
1528 DBG(cdev
, "resume\n");
1529 if (composite
->resume
)
1530 composite
->resume(cdev
);
1532 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
1537 maxpower
= cdev
->config
->bMaxPower
;
1539 usb_gadget_vbus_draw(gadget
, maxpower
?
1540 (2 * maxpower
) : CONFIG_USB_GADGET_VBUS_DRAW
);
1543 cdev
->suspended
= 0;
1546 /*-------------------------------------------------------------------------*/
1548 static struct usb_gadget_driver composite_driver
= {
1549 #ifdef CONFIG_USB_GADGET_SUPERSPEED
1550 .max_speed
= USB_SPEED_SUPER
,
1552 .max_speed
= USB_SPEED_HIGH
,
1555 .unbind
= composite_unbind
,
1557 .setup
= composite_setup
,
1558 .disconnect
= composite_disconnect
,
1560 .suspend
= composite_suspend
,
1561 .resume
= composite_resume
,
1564 .owner
= THIS_MODULE
,
1569 * usb_composite_probe() - register a composite driver
1570 * @driver: the driver to register
1571 * @bind: the callback used to allocate resources that are shared across the
1572 * whole device, such as string IDs, and add its configurations using
1573 * @usb_add_config(). This may fail by returning a negative errno
1574 * value; it should return zero on successful initialization.
1575 * Context: single threaded during gadget setup
1577 * This function is used to register drivers using the composite driver
1578 * framework. The return value is zero, or a negative errno value.
1579 * Those values normally come from the driver's @bind method, which does
1580 * all the work of setting up the driver to match the hardware.
1582 * On successful return, the gadget is ready to respond to requests from
1583 * the host, unless one of its components invokes usb_gadget_disconnect()
1584 * while it was binding. That would usually be done in order to wait for
1585 * some userspace participation.
1587 int usb_composite_probe(struct usb_composite_driver
*driver
,
1588 int (*bind
)(struct usb_composite_dev
*cdev
))
1590 if (!driver
|| !driver
->dev
|| !bind
|| composite
)
1594 driver
->name
= "composite";
1595 if (!driver
->iProduct
)
1596 driver
->iProduct
= driver
->name
;
1597 composite_driver
.function
= (char *) driver
->name
;
1598 composite_driver
.driver
.name
= driver
->name
;
1599 composite_driver
.max_speed
=
1600 min_t(u8
, composite_driver
.max_speed
, driver
->max_speed
);
1602 composite_gadget_bind
= bind
;
1604 return usb_gadget_probe_driver(&composite_driver
, composite_bind
);
1608 * usb_composite_unregister() - unregister a composite driver
1609 * @driver: the driver to unregister
1611 * This function is used to unregister drivers using the composite
1614 void usb_composite_unregister(struct usb_composite_driver
*driver
)
1616 if (composite
!= driver
)
1618 usb_gadget_unregister_driver(&composite_driver
);
1622 * usb_composite_setup_continue() - Continue with the control transfer
1623 * @cdev: the composite device who's control transfer was kept waiting
1625 * This function must be called by the USB function driver to continue
1626 * with the control transfer's data/status stage in case it had requested to
1627 * delay the data/status stages. A USB function's setup handler (e.g. set_alt())
1628 * can request the composite framework to delay the setup request's data/status
1629 * stages by returning USB_GADGET_DELAYED_STATUS.
1631 void usb_composite_setup_continue(struct usb_composite_dev
*cdev
)
1634 struct usb_request
*req
= cdev
->req
;
1635 unsigned long flags
;
1637 DBG(cdev
, "%s\n", __func__
);
1638 spin_lock_irqsave(&cdev
->lock
, flags
);
1640 if (cdev
->delayed_status
== 0) {
1641 WARN(cdev
, "%s: Unexpected call\n", __func__
);
1643 } else if (--cdev
->delayed_status
== 0) {
1644 DBG(cdev
, "%s: Completing delayed status\n", __func__
);
1646 value
= usb_ep_queue(cdev
->gadget
->ep0
, req
, GFP_ATOMIC
);
1648 DBG(cdev
, "ep_queue --> %d\n", value
);
1650 composite_setup_complete(cdev
->gadget
->ep0
, req
);
1654 spin_unlock_irqrestore(&cdev
->lock
, flags
);