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.
32 * next_ep_desc() - advance to the next EP descriptor
33 * @t: currect pointer within descriptor array
35 * Return: next EP descriptor or NULL
37 * Iterate over @t until either EP descriptor found or
38 * NULL (that indicates end of list) encountered
40 static struct usb_descriptor_header
**
41 next_ep_desc(struct usb_descriptor_header
**t
)
44 if ((*t
)->bDescriptorType
== USB_DT_ENDPOINT
)
51 * for_each_ep_desc()- iterate over endpoint descriptors in the
53 * @start: pointer within descriptor array.
54 * @ep_desc: endpoint descriptor to use as the loop cursor
56 #define for_each_ep_desc(start, ep_desc) \
57 for (ep_desc = next_ep_desc(start); \
58 ep_desc; ep_desc = next_ep_desc(ep_desc+1))
61 * config_ep_by_speed() - configures the given endpoint
62 * according to gadget speed.
63 * @g: pointer to the gadget
65 * @_ep: the endpoint to configure
67 * Return: error code, 0 on success
69 * This function chooses the right descriptors for a given
70 * endpoint according to gadget speed and saves it in the
71 * endpoint desc field. If the endpoint already has a descriptor
72 * assigned to it - overwrites it with currently corresponding
73 * descriptor. The endpoint maxpacket field is updated according
74 * to the chosen descriptor.
75 * Note: the supplied function should hold all the descriptors
76 * for supported speeds
78 int config_ep_by_speed(struct usb_gadget
*g
,
79 struct usb_function
*f
,
82 struct usb_composite_dev
*cdev
= get_gadget_data(g
);
83 struct usb_endpoint_descriptor
*chosen_desc
= NULL
;
84 struct usb_descriptor_header
**speed_desc
= NULL
;
86 struct usb_ss_ep_comp_descriptor
*comp_desc
= NULL
;
87 int want_comp_desc
= 0;
89 struct usb_descriptor_header
**d_spd
; /* cursor for speed desc */
94 /* select desired speed */
97 if (gadget_is_superspeed(g
)) {
98 speed_desc
= f
->ss_descriptors
;
102 /* else: Fall trough */
104 if (gadget_is_dualspeed(g
)) {
105 speed_desc
= f
->hs_descriptors
;
108 /* else: fall through */
110 speed_desc
= f
->fs_descriptors
;
112 /* find descriptors */
113 for_each_ep_desc(speed_desc
, d_spd
) {
114 chosen_desc
= (struct usb_endpoint_descriptor
*)*d_spd
;
115 if (chosen_desc
->bEndpointAddress
== _ep
->address
)
122 _ep
->maxpacket
= usb_endpoint_maxp(chosen_desc
);
123 _ep
->desc
= chosen_desc
;
124 _ep
->comp_desc
= NULL
;
131 * Companion descriptor should follow EP descriptor
132 * USB 3.0 spec, #9.6.7
134 comp_desc
= (struct usb_ss_ep_comp_descriptor
*)*(++d_spd
);
136 (comp_desc
->bDescriptorType
!= USB_DT_SS_ENDPOINT_COMP
))
138 _ep
->comp_desc
= comp_desc
;
139 if (g
->speed
== USB_SPEED_SUPER
) {
140 switch (usb_endpoint_type(_ep
->desc
)) {
141 case USB_ENDPOINT_XFER_ISOC
:
142 /* mult: bits 1:0 of bmAttributes */
143 _ep
->mult
= comp_desc
->bmAttributes
& 0x3;
144 case USB_ENDPOINT_XFER_BULK
:
145 case USB_ENDPOINT_XFER_INT
:
146 _ep
->maxburst
= comp_desc
->bMaxBurst
+ 1;
149 if (comp_desc
->bMaxBurst
!= 0)
150 ERROR(cdev
, "ep0 bMaxBurst must be 0\n");
157 EXPORT_SYMBOL_GPL(config_ep_by_speed
);
160 * usb_add_function() - add a function to a configuration
161 * @config: the configuration
162 * @function: the function being added
163 * Context: single threaded during gadget setup
165 * After initialization, each configuration must have one or more
166 * functions added to it. Adding a function involves calling its @bind()
167 * method to allocate resources such as interface and string identifiers
170 * This function returns the value of the function's bind(), which is
171 * zero for success else a negative errno value.
173 int usb_add_function(struct usb_configuration
*config
,
174 struct usb_function
*function
)
178 DBG(config
->cdev
, "adding '%s'/%p to config '%s'/%p\n",
179 function
->name
, function
,
180 config
->label
, config
);
182 if (!function
->set_alt
|| !function
->disable
)
185 function
->config
= config
;
186 list_add_tail(&function
->list
, &config
->functions
);
188 /* REVISIT *require* function->bind? */
189 if (function
->bind
) {
190 value
= function
->bind(config
, function
);
192 list_del(&function
->list
);
193 function
->config
= NULL
;
198 /* We allow configurations that don't work at both speeds.
199 * If we run into a lowspeed Linux system, treat it the same
200 * as full speed ... it's the function drivers that will need
201 * to avoid bulk and ISO transfers.
203 if (!config
->fullspeed
&& function
->fs_descriptors
)
204 config
->fullspeed
= true;
205 if (!config
->highspeed
&& function
->hs_descriptors
)
206 config
->highspeed
= true;
207 if (!config
->superspeed
&& function
->ss_descriptors
)
208 config
->superspeed
= true;
212 DBG(config
->cdev
, "adding '%s'/%p --> %d\n",
213 function
->name
, function
, value
);
216 EXPORT_SYMBOL_GPL(usb_add_function
);
219 * usb_function_deactivate - prevent function and gadget enumeration
220 * @function: the function that isn't yet ready to respond
222 * Blocks response of the gadget driver to host enumeration by
223 * preventing the data line pullup from being activated. This is
224 * normally called during @bind() processing to change from the
225 * initial "ready to respond" state, or when a required resource
228 * For example, drivers that serve as a passthrough to a userspace
229 * daemon can block enumeration unless that daemon (such as an OBEX,
230 * MTP, or print server) is ready to handle host requests.
232 * Not all systems support software control of their USB peripheral
235 * Returns zero on success, else negative errno.
237 int usb_function_deactivate(struct usb_function
*function
)
239 struct usb_composite_dev
*cdev
= function
->config
->cdev
;
243 spin_lock_irqsave(&cdev
->lock
, flags
);
245 if (cdev
->deactivations
== 0)
246 status
= usb_gadget_disconnect(cdev
->gadget
);
248 cdev
->deactivations
++;
250 spin_unlock_irqrestore(&cdev
->lock
, flags
);
253 EXPORT_SYMBOL_GPL(usb_function_deactivate
);
256 * usb_function_activate - allow function and gadget enumeration
257 * @function: function on which usb_function_activate() was called
259 * Reverses effect of usb_function_deactivate(). If no more functions
260 * are delaying their activation, the gadget driver will respond to
261 * host enumeration procedures.
263 * Returns zero on success, else negative errno.
265 int usb_function_activate(struct usb_function
*function
)
267 struct usb_composite_dev
*cdev
= function
->config
->cdev
;
271 spin_lock_irqsave(&cdev
->lock
, flags
);
273 if (WARN_ON(cdev
->deactivations
== 0))
276 cdev
->deactivations
--;
277 if (cdev
->deactivations
== 0)
278 status
= usb_gadget_connect(cdev
->gadget
);
281 spin_unlock_irqrestore(&cdev
->lock
, flags
);
284 EXPORT_SYMBOL_GPL(usb_function_activate
);
287 * usb_interface_id() - allocate an unused interface ID
288 * @config: configuration associated with the interface
289 * @function: function handling the interface
290 * Context: single threaded during gadget setup
292 * usb_interface_id() is called from usb_function.bind() callbacks to
293 * allocate new interface IDs. The function driver will then store that
294 * ID in interface, association, CDC union, and other descriptors. It
295 * will also handle any control requests targeted at that interface,
296 * particularly changing its altsetting via set_alt(). There may
297 * also be class-specific or vendor-specific requests to handle.
299 * All interface identifier should be allocated using this routine, to
300 * ensure that for example different functions don't wrongly assign
301 * different meanings to the same identifier. Note that since interface
302 * identifiers are configuration-specific, functions used in more than
303 * one configuration (or more than once in a given configuration) need
304 * multiple versions of the relevant descriptors.
306 * Returns the interface ID which was allocated; or -ENODEV if no
307 * more interface IDs can be allocated.
309 int usb_interface_id(struct usb_configuration
*config
,
310 struct usb_function
*function
)
312 unsigned id
= config
->next_interface_id
;
314 if (id
< MAX_CONFIG_INTERFACES
) {
315 config
->interface
[id
] = function
;
316 config
->next_interface_id
= id
+ 1;
321 EXPORT_SYMBOL_GPL(usb_interface_id
);
323 static int config_buf(struct usb_configuration
*config
,
324 enum usb_device_speed speed
, void *buf
, u8 type
)
326 struct usb_config_descriptor
*c
= buf
;
327 void *next
= buf
+ USB_DT_CONFIG_SIZE
;
329 struct usb_function
*f
;
332 len
= USB_COMP_EP0_BUFSIZ
- USB_DT_CONFIG_SIZE
;
333 /* write the config descriptor */
335 c
->bLength
= USB_DT_CONFIG_SIZE
;
336 c
->bDescriptorType
= type
;
337 /* wTotalLength is written later */
338 c
->bNumInterfaces
= config
->next_interface_id
;
339 c
->bConfigurationValue
= config
->bConfigurationValue
;
340 c
->iConfiguration
= config
->iConfiguration
;
341 c
->bmAttributes
= USB_CONFIG_ATT_ONE
| config
->bmAttributes
;
342 c
->bMaxPower
= config
->bMaxPower
? : (CONFIG_USB_GADGET_VBUS_DRAW
/ 2);
344 /* There may be e.g. OTG descriptors */
345 if (config
->descriptors
) {
346 status
= usb_descriptor_fillbuf(next
, len
,
347 config
->descriptors
);
354 /* add each function's descriptors */
355 list_for_each_entry(f
, &config
->functions
, list
) {
356 struct usb_descriptor_header
**descriptors
;
359 case USB_SPEED_SUPER
:
360 descriptors
= f
->ss_descriptors
;
363 descriptors
= f
->hs_descriptors
;
366 descriptors
= f
->fs_descriptors
;
371 status
= usb_descriptor_fillbuf(next
, len
,
372 (const struct usb_descriptor_header
**) descriptors
);
380 c
->wTotalLength
= cpu_to_le16(len
);
384 static int config_desc(struct usb_composite_dev
*cdev
, unsigned w_value
)
386 struct usb_gadget
*gadget
= cdev
->gadget
;
387 struct usb_configuration
*c
;
388 u8 type
= w_value
>> 8;
389 enum usb_device_speed speed
= USB_SPEED_UNKNOWN
;
391 if (gadget
->speed
== USB_SPEED_SUPER
)
392 speed
= gadget
->speed
;
393 else if (gadget_is_dualspeed(gadget
)) {
395 if (gadget
->speed
== USB_SPEED_HIGH
)
397 if (type
== USB_DT_OTHER_SPEED_CONFIG
)
400 speed
= USB_SPEED_HIGH
;
404 /* This is a lookup by config *INDEX* */
406 list_for_each_entry(c
, &cdev
->configs
, list
) {
407 /* ignore configs that won't work at this speed */
409 case USB_SPEED_SUPER
:
423 return config_buf(c
, speed
, cdev
->req
->buf
, type
);
429 static int count_configs(struct usb_composite_dev
*cdev
, unsigned type
)
431 struct usb_gadget
*gadget
= cdev
->gadget
;
432 struct usb_configuration
*c
;
437 if (gadget_is_dualspeed(gadget
)) {
438 if (gadget
->speed
== USB_SPEED_HIGH
)
440 if (gadget
->speed
== USB_SPEED_SUPER
)
442 if (type
== USB_DT_DEVICE_QUALIFIER
)
445 list_for_each_entry(c
, &cdev
->configs
, list
) {
446 /* ignore configs that won't work at this speed */
463 * bos_desc() - prepares the BOS descriptor.
464 * @cdev: pointer to usb_composite device to generate the bos
467 * This function generates the BOS (Binary Device Object)
468 * descriptor and its device capabilities descriptors. The BOS
469 * descriptor should be supported by a SuperSpeed device.
471 static int bos_desc(struct usb_composite_dev
*cdev
)
473 struct usb_ext_cap_descriptor
*usb_ext
;
474 struct usb_ss_cap_descriptor
*ss_cap
;
475 struct usb_dcd_config_params dcd_config_params
;
476 struct usb_bos_descriptor
*bos
= cdev
->req
->buf
;
478 bos
->bLength
= USB_DT_BOS_SIZE
;
479 bos
->bDescriptorType
= USB_DT_BOS
;
481 bos
->wTotalLength
= cpu_to_le16(USB_DT_BOS_SIZE
);
482 bos
->bNumDeviceCaps
= 0;
485 * A SuperSpeed device shall include the USB2.0 extension descriptor
486 * and shall support LPM when operating in USB2.0 HS mode.
488 usb_ext
= cdev
->req
->buf
+ le16_to_cpu(bos
->wTotalLength
);
489 bos
->bNumDeviceCaps
++;
490 le16_add_cpu(&bos
->wTotalLength
, USB_DT_USB_EXT_CAP_SIZE
);
491 usb_ext
->bLength
= USB_DT_USB_EXT_CAP_SIZE
;
492 usb_ext
->bDescriptorType
= USB_DT_DEVICE_CAPABILITY
;
493 usb_ext
->bDevCapabilityType
= USB_CAP_TYPE_EXT
;
494 usb_ext
->bmAttributes
= cpu_to_le32(USB_LPM_SUPPORT
);
497 * The Superspeed USB Capability descriptor shall be implemented by all
498 * SuperSpeed devices.
500 ss_cap
= cdev
->req
->buf
+ le16_to_cpu(bos
->wTotalLength
);
501 bos
->bNumDeviceCaps
++;
502 le16_add_cpu(&bos
->wTotalLength
, USB_DT_USB_SS_CAP_SIZE
);
503 ss_cap
->bLength
= USB_DT_USB_SS_CAP_SIZE
;
504 ss_cap
->bDescriptorType
= USB_DT_DEVICE_CAPABILITY
;
505 ss_cap
->bDevCapabilityType
= USB_SS_CAP_TYPE
;
506 ss_cap
->bmAttributes
= 0; /* LTM is not supported yet */
507 ss_cap
->wSpeedSupported
= cpu_to_le16(USB_LOW_SPEED_OPERATION
|
508 USB_FULL_SPEED_OPERATION
|
509 USB_HIGH_SPEED_OPERATION
|
510 USB_5GBPS_OPERATION
);
511 ss_cap
->bFunctionalitySupport
= USB_LOW_SPEED_OPERATION
;
513 /* Get Controller configuration */
514 if (cdev
->gadget
->ops
->get_config_params
)
515 cdev
->gadget
->ops
->get_config_params(&dcd_config_params
);
517 dcd_config_params
.bU1devExitLat
= USB_DEFAULT_U1_DEV_EXIT_LAT
;
518 dcd_config_params
.bU2DevExitLat
=
519 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT
);
521 ss_cap
->bU1devExitLat
= dcd_config_params
.bU1devExitLat
;
522 ss_cap
->bU2DevExitLat
= dcd_config_params
.bU2DevExitLat
;
524 return le16_to_cpu(bos
->wTotalLength
);
527 static void device_qual(struct usb_composite_dev
*cdev
)
529 struct usb_qualifier_descriptor
*qual
= cdev
->req
->buf
;
531 qual
->bLength
= sizeof(*qual
);
532 qual
->bDescriptorType
= USB_DT_DEVICE_QUALIFIER
;
533 /* POLICY: same bcdUSB and device type info at both speeds */
534 qual
->bcdUSB
= cdev
->desc
.bcdUSB
;
535 qual
->bDeviceClass
= cdev
->desc
.bDeviceClass
;
536 qual
->bDeviceSubClass
= cdev
->desc
.bDeviceSubClass
;
537 qual
->bDeviceProtocol
= cdev
->desc
.bDeviceProtocol
;
538 /* ASSUME same EP0 fifo size at both speeds */
539 qual
->bMaxPacketSize0
= cdev
->gadget
->ep0
->maxpacket
;
540 qual
->bNumConfigurations
= count_configs(cdev
, USB_DT_DEVICE_QUALIFIER
);
544 /*-------------------------------------------------------------------------*/
546 static void reset_config(struct usb_composite_dev
*cdev
)
548 struct usb_function
*f
;
550 DBG(cdev
, "reset config\n");
552 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
556 bitmap_zero(f
->endpoints
, 32);
561 static int set_config(struct usb_composite_dev
*cdev
,
562 const struct usb_ctrlrequest
*ctrl
, unsigned number
)
564 struct usb_gadget
*gadget
= cdev
->gadget
;
565 struct usb_configuration
*c
= NULL
;
566 int result
= -EINVAL
;
567 unsigned power
= gadget_is_otg(gadget
) ? 8 : 100;
571 list_for_each_entry(c
, &cdev
->configs
, list
) {
572 if (c
->bConfigurationValue
== number
) {
574 * We disable the FDs of the previous
575 * configuration only if the new configuration
586 } else { /* Zero configuration value - need to reset the config */
592 INFO(cdev
, "%s config #%d: %s\n",
593 usb_speed_string(gadget
->speed
),
594 number
, c
? c
->label
: "unconfigured");
601 /* Initialize all interfaces by setting them to altsetting zero. */
602 for (tmp
= 0; tmp
< MAX_CONFIG_INTERFACES
; tmp
++) {
603 struct usb_function
*f
= c
->interface
[tmp
];
604 struct usb_descriptor_header
**descriptors
;
610 * Record which endpoints are used by the function. This is used
611 * to dispatch control requests targeted at that endpoint to the
612 * function's setup callback instead of the current
613 * configuration's setup callback.
615 switch (gadget
->speed
) {
616 case USB_SPEED_SUPER
:
617 descriptors
= f
->ss_descriptors
;
620 descriptors
= f
->hs_descriptors
;
623 descriptors
= f
->fs_descriptors
;
626 for (; *descriptors
; ++descriptors
) {
627 struct usb_endpoint_descriptor
*ep
;
630 if ((*descriptors
)->bDescriptorType
!= USB_DT_ENDPOINT
)
633 ep
= (struct usb_endpoint_descriptor
*)*descriptors
;
634 addr
= ((ep
->bEndpointAddress
& 0x80) >> 3)
635 | (ep
->bEndpointAddress
& 0x0f);
636 set_bit(addr
, f
->endpoints
);
639 result
= f
->set_alt(f
, tmp
, 0);
641 DBG(cdev
, "interface %d (%s/%p) alt 0 --> %d\n",
642 tmp
, f
->name
, f
, result
);
648 if (result
== USB_GADGET_DELAYED_STATUS
) {
650 "%s: interface %d (%s) requested delayed status\n",
651 __func__
, tmp
, f
->name
);
652 cdev
->delayed_status
++;
653 DBG(cdev
, "delayed_status count %d\n",
654 cdev
->delayed_status
);
658 /* when we return, be sure our power usage is valid */
659 power
= c
->bMaxPower
? (2 * c
->bMaxPower
) : CONFIG_USB_GADGET_VBUS_DRAW
;
661 usb_gadget_vbus_draw(gadget
, power
);
662 if (result
>= 0 && cdev
->delayed_status
)
663 result
= USB_GADGET_DELAYED_STATUS
;
668 * usb_add_config() - add a configuration to a device.
669 * @cdev: wraps the USB gadget
670 * @config: the configuration, with bConfigurationValue assigned
671 * @bind: the configuration's bind function
672 * Context: single threaded during gadget setup
674 * One of the main tasks of a composite @bind() routine is to
675 * add each of the configurations it supports, using this routine.
677 * This function returns the value of the configuration's @bind(), which
678 * is zero for success else a negative errno value. Binding configurations
679 * assigns global resources including string IDs, and per-configuration
680 * resources such as interface IDs and endpoints.
682 int usb_add_config(struct usb_composite_dev
*cdev
,
683 struct usb_configuration
*config
,
684 int (*bind
)(struct usb_configuration
*))
686 int status
= -EINVAL
;
687 struct usb_configuration
*c
;
689 DBG(cdev
, "adding config #%u '%s'/%p\n",
690 config
->bConfigurationValue
,
691 config
->label
, config
);
693 if (!config
->bConfigurationValue
|| !bind
)
696 /* Prevent duplicate configuration identifiers */
697 list_for_each_entry(c
, &cdev
->configs
, list
) {
698 if (c
->bConfigurationValue
== config
->bConfigurationValue
) {
705 list_add_tail(&config
->list
, &cdev
->configs
);
707 INIT_LIST_HEAD(&config
->functions
);
708 config
->next_interface_id
= 0;
709 memset(config
->interface
, 0, sizeof(config
->interface
));
711 status
= bind(config
);
713 while (!list_empty(&config
->functions
)) {
714 struct usb_function
*f
;
716 f
= list_first_entry(&config
->functions
,
717 struct usb_function
, list
);
720 DBG(cdev
, "unbind function '%s'/%p\n",
722 f
->unbind(config
, f
);
723 /* may free memory for "f" */
726 list_del(&config
->list
);
731 DBG(cdev
, "cfg %d/%p speeds:%s%s%s\n",
732 config
->bConfigurationValue
, config
,
733 config
->superspeed
? " super" : "",
734 config
->highspeed
? " high" : "",
736 ? (gadget_is_dualspeed(cdev
->gadget
)
741 for (i
= 0; i
< MAX_CONFIG_INTERFACES
; i
++) {
742 struct usb_function
*f
= config
->interface
[i
];
746 DBG(cdev
, " interface %d = %s/%p\n",
751 /* set_alt(), or next bind(), sets up
752 * ep->driver_data as needed.
754 usb_ep_autoconfig_reset(cdev
->gadget
);
758 DBG(cdev
, "added config '%s'/%u --> %d\n", config
->label
,
759 config
->bConfigurationValue
, status
);
762 EXPORT_SYMBOL_GPL(usb_add_config
);
764 static void remove_config(struct usb_composite_dev
*cdev
,
765 struct usb_configuration
*config
)
767 while (!list_empty(&config
->functions
)) {
768 struct usb_function
*f
;
770 f
= list_first_entry(&config
->functions
,
771 struct usb_function
, list
);
774 DBG(cdev
, "unbind function '%s'/%p\n", f
->name
, f
);
775 f
->unbind(config
, f
);
776 /* may free memory for "f" */
779 list_del(&config
->list
);
780 if (config
->unbind
) {
781 DBG(cdev
, "unbind config '%s'/%p\n", config
->label
, config
);
782 config
->unbind(config
);
783 /* may free memory for "c" */
788 * usb_remove_config() - remove a configuration from a device.
789 * @cdev: wraps the USB gadget
790 * @config: the configuration
792 * Drivers must call usb_gadget_disconnect before calling this function
793 * to disconnect the device from the host and make sure the host will not
794 * try to enumerate the device while we are changing the config list.
796 void usb_remove_config(struct usb_composite_dev
*cdev
,
797 struct usb_configuration
*config
)
801 spin_lock_irqsave(&cdev
->lock
, flags
);
803 if (cdev
->config
== config
)
806 spin_unlock_irqrestore(&cdev
->lock
, flags
);
808 remove_config(cdev
, config
);
811 /*-------------------------------------------------------------------------*/
813 /* We support strings in multiple languages ... string descriptor zero
814 * says which languages are supported. The typical case will be that
815 * only one language (probably English) is used, with I18N handled on
819 static void collect_langs(struct usb_gadget_strings
**sp
, __le16
*buf
)
821 const struct usb_gadget_strings
*s
;
827 language
= cpu_to_le16(s
->language
);
828 for (tmp
= buf
; *tmp
&& tmp
< &buf
[126]; tmp
++) {
829 if (*tmp
== language
)
838 static int lookup_string(
839 struct usb_gadget_strings
**sp
,
845 struct usb_gadget_strings
*s
;
850 if (s
->language
!= language
)
852 value
= usb_gadget_get_string(s
, id
, buf
);
859 static int get_string(struct usb_composite_dev
*cdev
,
860 void *buf
, u16 language
, int id
)
862 struct usb_composite_driver
*composite
= cdev
->driver
;
863 struct usb_configuration
*c
;
864 struct usb_function
*f
;
867 /* Yes, not only is USB's I18N support probably more than most
868 * folk will ever care about ... also, it's all supported here.
869 * (Except for UTF8 support for Unicode's "Astral Planes".)
872 /* 0 == report all available language codes */
874 struct usb_string_descriptor
*s
= buf
;
875 struct usb_gadget_strings
**sp
;
878 s
->bDescriptorType
= USB_DT_STRING
;
880 sp
= composite
->strings
;
882 collect_langs(sp
, s
->wData
);
884 list_for_each_entry(c
, &cdev
->configs
, list
) {
887 collect_langs(sp
, s
->wData
);
889 list_for_each_entry(f
, &c
->functions
, list
) {
892 collect_langs(sp
, s
->wData
);
896 for (len
= 0; len
<= 126 && s
->wData
[len
]; len
++)
901 s
->bLength
= 2 * (len
+ 1);
905 /* String IDs are device-scoped, so we look up each string
906 * table we're told about. These lookups are infrequent;
907 * simpler-is-better here.
909 if (composite
->strings
) {
910 len
= lookup_string(composite
->strings
, buf
, language
, id
);
914 list_for_each_entry(c
, &cdev
->configs
, list
) {
916 len
= lookup_string(c
->strings
, buf
, language
, id
);
920 list_for_each_entry(f
, &c
->functions
, list
) {
923 len
= lookup_string(f
->strings
, buf
, language
, id
);
932 * usb_string_id() - allocate an unused string ID
933 * @cdev: the device whose string descriptor IDs are being allocated
934 * Context: single threaded during gadget setup
936 * @usb_string_id() is called from bind() callbacks to allocate
937 * string IDs. Drivers for functions, configurations, or gadgets will
938 * then store that ID in the appropriate descriptors and string table.
940 * All string identifier should be allocated using this,
941 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
942 * that for example different functions don't wrongly assign different
943 * meanings to the same identifier.
945 int usb_string_id(struct usb_composite_dev
*cdev
)
947 if (cdev
->next_string_id
< 254) {
948 /* string id 0 is reserved by USB spec for list of
949 * supported languages */
950 /* 255 reserved as well? -- mina86 */
951 cdev
->next_string_id
++;
952 return cdev
->next_string_id
;
956 EXPORT_SYMBOL_GPL(usb_string_id
);
959 * usb_string_ids() - allocate unused string IDs in batch
960 * @cdev: the device whose string descriptor IDs are being allocated
961 * @str: an array of usb_string objects to assign numbers to
962 * Context: single threaded during gadget setup
964 * @usb_string_ids() is called from bind() callbacks to allocate
965 * string IDs. Drivers for functions, configurations, or gadgets will
966 * then copy IDs from the string table to the appropriate descriptors
967 * and string table for other languages.
969 * All string identifier should be allocated using this,
970 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
971 * example different functions don't wrongly assign different meanings
972 * to the same identifier.
974 int usb_string_ids_tab(struct usb_composite_dev
*cdev
, struct usb_string
*str
)
976 int next
= cdev
->next_string_id
;
978 for (; str
->s
; ++str
) {
979 if (unlikely(next
>= 254))
984 cdev
->next_string_id
= next
;
988 EXPORT_SYMBOL_GPL(usb_string_ids_tab
);
991 * usb_string_ids_n() - allocate unused string IDs in batch
992 * @c: the device whose string descriptor IDs are being allocated
993 * @n: number of string IDs to allocate
994 * Context: single threaded during gadget setup
996 * Returns the first requested ID. This ID and next @n-1 IDs are now
997 * valid IDs. At least provided that @n is non-zero because if it
998 * is, returns last requested ID which is now very useful information.
1000 * @usb_string_ids_n() is called from bind() callbacks to allocate
1001 * string IDs. Drivers for functions, configurations, or gadgets will
1002 * then store that ID in the appropriate descriptors and string table.
1004 * All string identifier should be allocated using this,
1005 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1006 * example different functions don't wrongly assign different meanings
1007 * to the same identifier.
1009 int usb_string_ids_n(struct usb_composite_dev
*c
, unsigned n
)
1011 unsigned next
= c
->next_string_id
;
1012 if (unlikely(n
> 254 || (unsigned)next
+ n
> 254))
1014 c
->next_string_id
+= n
;
1017 EXPORT_SYMBOL_GPL(usb_string_ids_n
);
1019 /*-------------------------------------------------------------------------*/
1021 static void composite_setup_complete(struct usb_ep
*ep
, struct usb_request
*req
)
1023 if (req
->status
|| req
->actual
!= req
->length
)
1024 DBG((struct usb_composite_dev
*) ep
->driver_data
,
1025 "setup complete --> %d, %d/%d\n",
1026 req
->status
, req
->actual
, req
->length
);
1030 * The setup() callback implements all the ep0 functionality that's
1031 * not handled lower down, in hardware or the hardware driver(like
1032 * device and endpoint feature flags, and their status). It's all
1033 * housekeeping for the gadget function we're implementing. Most of
1034 * the work is in config and function specific setup.
1037 composite_setup(struct usb_gadget
*gadget
, const struct usb_ctrlrequest
*ctrl
)
1039 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1040 struct usb_request
*req
= cdev
->req
;
1041 int value
= -EOPNOTSUPP
;
1043 u16 w_index
= le16_to_cpu(ctrl
->wIndex
);
1044 u8 intf
= w_index
& 0xFF;
1045 u16 w_value
= le16_to_cpu(ctrl
->wValue
);
1046 u16 w_length
= le16_to_cpu(ctrl
->wLength
);
1047 struct usb_function
*f
= NULL
;
1050 /* partial re-init of the response message; the function or the
1051 * gadget might need to intercept e.g. a control-OUT completion
1052 * when we delegate to it.
1055 req
->complete
= composite_setup_complete
;
1057 gadget
->ep0
->driver_data
= cdev
;
1059 switch (ctrl
->bRequest
) {
1061 /* we handle all standard USB descriptors */
1062 case USB_REQ_GET_DESCRIPTOR
:
1063 if (ctrl
->bRequestType
!= USB_DIR_IN
)
1065 switch (w_value
>> 8) {
1068 cdev
->desc
.bNumConfigurations
=
1069 count_configs(cdev
, USB_DT_DEVICE
);
1070 cdev
->desc
.bMaxPacketSize0
=
1071 cdev
->gadget
->ep0
->maxpacket
;
1072 if (gadget_is_superspeed(gadget
)) {
1073 if (gadget
->speed
>= USB_SPEED_SUPER
) {
1074 cdev
->desc
.bcdUSB
= cpu_to_le16(0x0300);
1075 cdev
->desc
.bMaxPacketSize0
= 9;
1077 cdev
->desc
.bcdUSB
= cpu_to_le16(0x0210);
1081 value
= min(w_length
, (u16
) sizeof cdev
->desc
);
1082 memcpy(req
->buf
, &cdev
->desc
, value
);
1084 case USB_DT_DEVICE_QUALIFIER
:
1085 if (!gadget_is_dualspeed(gadget
) ||
1086 gadget
->speed
>= USB_SPEED_SUPER
)
1089 value
= min_t(int, w_length
,
1090 sizeof(struct usb_qualifier_descriptor
));
1092 case USB_DT_OTHER_SPEED_CONFIG
:
1093 if (!gadget_is_dualspeed(gadget
) ||
1094 gadget
->speed
>= USB_SPEED_SUPER
)
1098 value
= config_desc(cdev
, w_value
);
1100 value
= min(w_length
, (u16
) value
);
1103 value
= get_string(cdev
, req
->buf
,
1104 w_index
, w_value
& 0xff);
1106 value
= min(w_length
, (u16
) value
);
1109 if (gadget_is_superspeed(gadget
)) {
1110 value
= bos_desc(cdev
);
1111 value
= min(w_length
, (u16
) value
);
1117 /* any number of configs can work */
1118 case USB_REQ_SET_CONFIGURATION
:
1119 if (ctrl
->bRequestType
!= 0)
1121 if (gadget_is_otg(gadget
)) {
1122 if (gadget
->a_hnp_support
)
1123 DBG(cdev
, "HNP available\n");
1124 else if (gadget
->a_alt_hnp_support
)
1125 DBG(cdev
, "HNP on another port\n");
1127 VDBG(cdev
, "HNP inactive\n");
1129 spin_lock(&cdev
->lock
);
1130 value
= set_config(cdev
, ctrl
, w_value
);
1131 spin_unlock(&cdev
->lock
);
1133 case USB_REQ_GET_CONFIGURATION
:
1134 if (ctrl
->bRequestType
!= USB_DIR_IN
)
1137 *(u8
*)req
->buf
= cdev
->config
->bConfigurationValue
;
1139 *(u8
*)req
->buf
= 0;
1140 value
= min(w_length
, (u16
) 1);
1143 /* function drivers must handle get/set altsetting; if there's
1144 * no get() method, we know only altsetting zero works.
1146 case USB_REQ_SET_INTERFACE
:
1147 if (ctrl
->bRequestType
!= USB_RECIP_INTERFACE
)
1149 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1151 f
= cdev
->config
->interface
[intf
];
1154 if (w_value
&& !f
->set_alt
)
1156 value
= f
->set_alt(f
, w_index
, w_value
);
1157 if (value
== USB_GADGET_DELAYED_STATUS
) {
1159 "%s: interface %d (%s) requested delayed status\n",
1160 __func__
, intf
, f
->name
);
1161 cdev
->delayed_status
++;
1162 DBG(cdev
, "delayed_status count %d\n",
1163 cdev
->delayed_status
);
1166 case USB_REQ_GET_INTERFACE
:
1167 if (ctrl
->bRequestType
!= (USB_DIR_IN
|USB_RECIP_INTERFACE
))
1169 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1171 f
= cdev
->config
->interface
[intf
];
1174 /* lots of interfaces only need altsetting zero... */
1175 value
= f
->get_alt
? f
->get_alt(f
, w_index
) : 0;
1178 *((u8
*)req
->buf
) = value
;
1179 value
= min(w_length
, (u16
) 1);
1183 * USB 3.0 additions:
1184 * Function driver should handle get_status request. If such cb
1185 * wasn't supplied we respond with default value = 0
1186 * Note: function driver should supply such cb only for the first
1187 * interface of the function
1189 case USB_REQ_GET_STATUS
:
1190 if (!gadget_is_superspeed(gadget
))
1192 if (ctrl
->bRequestType
!= (USB_DIR_IN
| USB_RECIP_INTERFACE
))
1194 value
= 2; /* This is the length of the get_status reply */
1195 put_unaligned_le16(0, req
->buf
);
1196 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1198 f
= cdev
->config
->interface
[intf
];
1201 status
= f
->get_status
? f
->get_status(f
) : 0;
1204 put_unaligned_le16(status
& 0x0000ffff, req
->buf
);
1207 * Function drivers should handle SetFeature/ClearFeature
1208 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
1209 * only for the first interface of the function
1211 case USB_REQ_CLEAR_FEATURE
:
1212 case USB_REQ_SET_FEATURE
:
1213 if (!gadget_is_superspeed(gadget
))
1215 if (ctrl
->bRequestType
!= (USB_DIR_OUT
| USB_RECIP_INTERFACE
))
1218 case USB_INTRF_FUNC_SUSPEND
:
1219 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1221 f
= cdev
->config
->interface
[intf
];
1225 if (f
->func_suspend
)
1226 value
= f
->func_suspend(f
, w_index
>> 8);
1229 "func_suspend() returned error %d\n",
1239 "non-core control req%02x.%02x v%04x i%04x l%d\n",
1240 ctrl
->bRequestType
, ctrl
->bRequest
,
1241 w_value
, w_index
, w_length
);
1243 /* functions always handle their interfaces and endpoints...
1244 * punt other recipients (other, WUSB, ...) to the current
1245 * configuration code.
1247 * REVISIT it could make sense to let the composite device
1248 * take such requests too, if that's ever needed: to work
1251 switch (ctrl
->bRequestType
& USB_RECIP_MASK
) {
1252 case USB_RECIP_INTERFACE
:
1253 if (!cdev
->config
|| intf
>= MAX_CONFIG_INTERFACES
)
1255 f
= cdev
->config
->interface
[intf
];
1258 case USB_RECIP_ENDPOINT
:
1259 endp
= ((w_index
& 0x80) >> 3) | (w_index
& 0x0f);
1260 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
1261 if (test_bit(endp
, f
->endpoints
))
1264 if (&f
->list
== &cdev
->config
->functions
)
1270 value
= f
->setup(f
, ctrl
);
1272 struct usb_configuration
*c
;
1276 value
= c
->setup(c
, ctrl
);
1282 /* respond with data transfer before status phase? */
1283 if (value
>= 0 && value
!= USB_GADGET_DELAYED_STATUS
) {
1284 req
->length
= value
;
1285 req
->zero
= value
< w_length
;
1286 value
= usb_ep_queue(gadget
->ep0
, req
, GFP_ATOMIC
);
1288 DBG(cdev
, "ep_queue --> %d\n", value
);
1290 composite_setup_complete(gadget
->ep0
, req
);
1292 } else if (value
== USB_GADGET_DELAYED_STATUS
&& w_length
!= 0) {
1294 "%s: Delayed status not supported for w_length != 0",
1299 /* device either stalls (value < 0) or reports success */
1303 static void composite_disconnect(struct usb_gadget
*gadget
)
1305 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1306 unsigned long flags
;
1308 /* REVISIT: should we have config and device level
1309 * disconnect callbacks?
1311 spin_lock_irqsave(&cdev
->lock
, flags
);
1314 if (cdev
->driver
->disconnect
)
1315 cdev
->driver
->disconnect(cdev
);
1316 spin_unlock_irqrestore(&cdev
->lock
, flags
);
1319 /*-------------------------------------------------------------------------*/
1321 static ssize_t
composite_show_suspended(struct device
*dev
,
1322 struct device_attribute
*attr
,
1325 struct usb_gadget
*gadget
= dev_to_usb_gadget(dev
);
1326 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1328 return sprintf(buf
, "%d\n", cdev
->suspended
);
1331 static DEVICE_ATTR(suspended
, 0444, composite_show_suspended
, NULL
);
1334 composite_unbind(struct usb_gadget
*gadget
)
1336 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1338 /* composite_disconnect() must already have been called
1339 * by the underlying peripheral controller driver!
1340 * so there's no i/o concurrency that could affect the
1341 * state protected by cdev->lock.
1343 WARN_ON(cdev
->config
);
1345 while (!list_empty(&cdev
->configs
)) {
1346 struct usb_configuration
*c
;
1347 c
= list_first_entry(&cdev
->configs
,
1348 struct usb_configuration
, list
);
1349 remove_config(cdev
, c
);
1351 if (cdev
->driver
->unbind
)
1352 cdev
->driver
->unbind(cdev
);
1355 kfree(cdev
->req
->buf
);
1356 usb_ep_free_request(gadget
->ep0
, cdev
->req
);
1358 device_remove_file(&gadget
->dev
, &dev_attr_suspended
);
1359 kfree(cdev
->def_manufacturer
);
1361 set_gadget_data(gadget
, NULL
);
1364 static void update_unchanged_dev_desc(struct usb_device_descriptor
*new,
1365 const struct usb_device_descriptor
*old
)
1375 * these variables may have been set in
1376 * usb_composite_overwrite_options()
1378 idVendor
= new->idVendor
;
1379 idProduct
= new->idProduct
;
1380 bcdDevice
= new->bcdDevice
;
1381 iSerialNumber
= new->iSerialNumber
;
1382 iManufacturer
= new->iManufacturer
;
1383 iProduct
= new->iProduct
;
1387 new->idVendor
= idVendor
;
1389 new->idProduct
= idProduct
;
1391 new->bcdDevice
= bcdDevice
;
1393 new->bcdDevice
= cpu_to_le16(get_default_bcdDevice());
1395 new->iSerialNumber
= iSerialNumber
;
1397 new->iManufacturer
= iManufacturer
;
1399 new->iProduct
= iProduct
;
1402 static struct usb_composite_driver
*to_cdriver(struct usb_gadget_driver
*gdrv
)
1404 return container_of(gdrv
, struct usb_composite_driver
, gadget_driver
);
1407 static int composite_bind(struct usb_gadget
*gadget
,
1408 struct usb_gadget_driver
*gdriver
)
1410 struct usb_composite_dev
*cdev
;
1411 struct usb_composite_driver
*composite
= to_cdriver(gdriver
);
1412 int status
= -ENOMEM
;
1414 cdev
= kzalloc(sizeof *cdev
, GFP_KERNEL
);
1418 spin_lock_init(&cdev
->lock
);
1419 cdev
->gadget
= gadget
;
1420 set_gadget_data(gadget
, cdev
);
1421 INIT_LIST_HEAD(&cdev
->configs
);
1423 /* preallocate control response and buffer */
1424 cdev
->req
= usb_ep_alloc_request(gadget
->ep0
, GFP_KERNEL
);
1427 cdev
->req
->buf
= kmalloc(USB_COMP_EP0_BUFSIZ
, GFP_KERNEL
);
1428 if (!cdev
->req
->buf
)
1430 cdev
->req
->complete
= composite_setup_complete
;
1431 gadget
->ep0
->driver_data
= cdev
;
1433 cdev
->driver
= composite
;
1436 * As per USB compliance update, a device that is actively drawing
1437 * more than 100mA from USB must report itself as bus-powered in
1438 * the GetStatus(DEVICE) call.
1440 if (CONFIG_USB_GADGET_VBUS_DRAW
<= USB_SELF_POWER_VBUS_MAX_DRAW
)
1441 usb_gadget_set_selfpowered(gadget
);
1443 /* interface and string IDs start at zero via kzalloc.
1444 * we force endpoints to start unassigned; few controller
1445 * drivers will zero ep->driver_data.
1447 usb_ep_autoconfig_reset(cdev
->gadget
);
1449 /* composite gadget needs to assign strings for whole device (like
1450 * serial number), register function drivers, potentially update
1451 * power state and consumption, etc
1453 status
= composite
->bind(cdev
);
1457 update_unchanged_dev_desc(&cdev
->desc
, composite
->dev
);
1459 /* has userspace failed to provide a serial number? */
1460 if (composite
->needs_serial
&& !cdev
->desc
.iSerialNumber
)
1461 WARNING(cdev
, "userspace failed to provide iSerialNumber\n");
1464 status
= device_create_file(&gadget
->dev
, &dev_attr_suspended
);
1468 INFO(cdev
, "%s ready\n", composite
->name
);
1472 composite_unbind(gadget
);
1476 /*-------------------------------------------------------------------------*/
1479 composite_suspend(struct usb_gadget
*gadget
)
1481 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1482 struct usb_function
*f
;
1484 /* REVISIT: should we have config level
1485 * suspend/resume callbacks?
1487 DBG(cdev
, "suspend\n");
1489 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
1494 if (cdev
->driver
->suspend
)
1495 cdev
->driver
->suspend(cdev
);
1497 cdev
->suspended
= 1;
1499 usb_gadget_vbus_draw(gadget
, 2);
1503 composite_resume(struct usb_gadget
*gadget
)
1505 struct usb_composite_dev
*cdev
= get_gadget_data(gadget
);
1506 struct usb_function
*f
;
1509 /* REVISIT: should we have config level
1510 * suspend/resume callbacks?
1512 DBG(cdev
, "resume\n");
1513 if (cdev
->driver
->resume
)
1514 cdev
->driver
->resume(cdev
);
1516 list_for_each_entry(f
, &cdev
->config
->functions
, list
) {
1521 maxpower
= cdev
->config
->bMaxPower
;
1523 usb_gadget_vbus_draw(gadget
, maxpower
?
1524 (2 * maxpower
) : CONFIG_USB_GADGET_VBUS_DRAW
);
1527 cdev
->suspended
= 0;
1530 /*-------------------------------------------------------------------------*/
1532 static const struct usb_gadget_driver composite_driver_template
= {
1533 .bind
= composite_bind
,
1534 .unbind
= composite_unbind
,
1536 .setup
= composite_setup
,
1537 .disconnect
= composite_disconnect
,
1539 .suspend
= composite_suspend
,
1540 .resume
= composite_resume
,
1543 .owner
= THIS_MODULE
,
1548 * usb_composite_probe() - register a composite driver
1549 * @driver: the driver to register
1550 * @bind: the callback used to allocate resources that are shared across the
1551 * whole device, such as string IDs, and add its configurations using
1552 * @usb_add_config(). This may fail by returning a negative errno
1553 * value; it should return zero on successful initialization.
1554 * Context: single threaded during gadget setup
1556 * This function is used to register drivers using the composite driver
1557 * framework. The return value is zero, or a negative errno value.
1558 * Those values normally come from the driver's @bind method, which does
1559 * all the work of setting up the driver to match the hardware.
1561 * On successful return, the gadget is ready to respond to requests from
1562 * the host, unless one of its components invokes usb_gadget_disconnect()
1563 * while it was binding. That would usually be done in order to wait for
1564 * some userspace participation.
1566 int usb_composite_probe(struct usb_composite_driver
*driver
)
1568 struct usb_gadget_driver
*gadget_driver
;
1570 if (!driver
|| !driver
->dev
|| !driver
->bind
)
1574 driver
->name
= "composite";
1576 driver
->gadget_driver
= composite_driver_template
;
1577 gadget_driver
= &driver
->gadget_driver
;
1579 gadget_driver
->function
= (char *) driver
->name
;
1580 gadget_driver
->driver
.name
= driver
->name
;
1581 gadget_driver
->max_speed
= driver
->max_speed
;
1583 return usb_gadget_probe_driver(gadget_driver
);
1585 EXPORT_SYMBOL_GPL(usb_composite_probe
);
1588 * usb_composite_unregister() - unregister a composite driver
1589 * @driver: the driver to unregister
1591 * This function is used to unregister drivers using the composite
1594 void usb_composite_unregister(struct usb_composite_driver
*driver
)
1596 usb_gadget_unregister_driver(&driver
->gadget_driver
);
1598 EXPORT_SYMBOL_GPL(usb_composite_unregister
);
1601 * usb_composite_setup_continue() - Continue with the control transfer
1602 * @cdev: the composite device who's control transfer was kept waiting
1604 * This function must be called by the USB function driver to continue
1605 * with the control transfer's data/status stage in case it had requested to
1606 * delay the data/status stages. A USB function's setup handler (e.g. set_alt())
1607 * can request the composite framework to delay the setup request's data/status
1608 * stages by returning USB_GADGET_DELAYED_STATUS.
1610 void usb_composite_setup_continue(struct usb_composite_dev
*cdev
)
1613 struct usb_request
*req
= cdev
->req
;
1614 unsigned long flags
;
1616 DBG(cdev
, "%s\n", __func__
);
1617 spin_lock_irqsave(&cdev
->lock
, flags
);
1619 if (cdev
->delayed_status
== 0) {
1620 WARN(cdev
, "%s: Unexpected call\n", __func__
);
1622 } else if (--cdev
->delayed_status
== 0) {
1623 DBG(cdev
, "%s: Completing delayed status\n", __func__
);
1625 value
= usb_ep_queue(cdev
->gadget
->ep0
, req
, GFP_ATOMIC
);
1627 DBG(cdev
, "ep_queue --> %d\n", value
);
1629 composite_setup_complete(cdev
->gadget
->ep0
, req
);
1633 spin_unlock_irqrestore(&cdev
->lock
, flags
);
1635 EXPORT_SYMBOL_GPL(usb_composite_setup_continue
);
1637 static char *composite_default_mfr(struct usb_gadget
*gadget
)
1642 len
= snprintf(NULL
, 0, "%s %s with %s", init_utsname()->sysname
,
1643 init_utsname()->release
, gadget
->name
);
1645 mfr
= kmalloc(len
, GFP_KERNEL
);
1648 snprintf(mfr
, len
, "%s %s with %s", init_utsname()->sysname
,
1649 init_utsname()->release
, gadget
->name
);
1653 void usb_composite_overwrite_options(struct usb_composite_dev
*cdev
,
1654 struct usb_composite_overwrite
*covr
)
1656 struct usb_device_descriptor
*desc
= &cdev
->desc
;
1657 struct usb_gadget_strings
*gstr
= cdev
->driver
->strings
[0];
1658 struct usb_string
*dev_str
= gstr
->strings
;
1661 desc
->idVendor
= cpu_to_le16(covr
->idVendor
);
1663 if (covr
->idProduct
)
1664 desc
->idProduct
= cpu_to_le16(covr
->idProduct
);
1666 if (covr
->bcdDevice
)
1667 desc
->bcdDevice
= cpu_to_le16(covr
->bcdDevice
);
1669 if (covr
->serial_number
) {
1670 desc
->iSerialNumber
= dev_str
[USB_GADGET_SERIAL_IDX
].id
;
1671 dev_str
[USB_GADGET_SERIAL_IDX
].s
= covr
->serial_number
;
1673 if (covr
->manufacturer
) {
1674 desc
->iManufacturer
= dev_str
[USB_GADGET_MANUFACTURER_IDX
].id
;
1675 dev_str
[USB_GADGET_MANUFACTURER_IDX
].s
= covr
->manufacturer
;
1677 } else if (!strlen(dev_str
[USB_GADGET_MANUFACTURER_IDX
].s
)) {
1678 desc
->iManufacturer
= dev_str
[USB_GADGET_MANUFACTURER_IDX
].id
;
1679 cdev
->def_manufacturer
= composite_default_mfr(cdev
->gadget
);
1680 dev_str
[USB_GADGET_MANUFACTURER_IDX
].s
= cdev
->def_manufacturer
;
1683 if (covr
->product
) {
1684 desc
->iProduct
= dev_str
[USB_GADGET_PRODUCT_IDX
].id
;
1685 dev_str
[USB_GADGET_PRODUCT_IDX
].s
= covr
->product
;
1688 EXPORT_SYMBOL_GPL(usb_composite_overwrite_options
);
1690 MODULE_LICENSE("GPL");
1691 MODULE_AUTHOR("David Brownell");