1 // SPDX-License-Identifier: GPL-2.0+
3 * composite.c - infrastructure for Composite USB Gadgets
5 * Copyright (C) 2006-2008 David Brownell
8 /* #define VERBOSE_DEBUG */
10 #include <linux/kallsyms.h>
11 #include <linux/kernel.h>
12 #include <linux/slab.h>
13 #include <linux/module.h>
14 #include <linux/device.h>
15 #include <linux/utsname.h>
16 #include <linux/bitfield.h>
18 #include <linux/usb/composite.h>
19 #include <linux/usb/otg.h>
20 #include <asm/unaligned.h>
22 #include "u_os_desc.h"
25 * struct usb_os_string - represents OS String to be reported by a gadget
26 * @bLength: total length of the entire descritor, always 0x12
27 * @bDescriptorType: USB_DT_STRING
28 * @qwSignature: the OS String proper
29 * @bMS_VendorCode: code used by the host for subsequent requests
30 * @bPad: not used, must be zero
32 struct usb_os_string {
35 __u8 qwSignature[OS_STRING_QW_SIGN_LEN];
41 * The code in this file is utility code, used to build a gadget driver
42 * from one or more "function" drivers, one or more "configuration"
43 * objects, and a "usb_composite_driver" by gluing them together along
44 * with the relevant device-wide data.
47 static struct usb_gadget_strings **get_containers_gs(
48 struct usb_gadget_string_container *uc)
50 return (struct usb_gadget_strings **)uc->stash;
54 * function_descriptors() - get function descriptors for speed
58 * Returns the descriptors or NULL if not set.
60 static struct usb_descriptor_header **
61 function_descriptors(struct usb_function *f,
62 enum usb_device_speed speed)
64 struct usb_descriptor_header **descriptors;
67 * NOTE: we try to help gadget drivers which might not be setting
68 * max_speed appropriately.
72 case USB_SPEED_SUPER_PLUS:
73 descriptors = f->ssp_descriptors;
78 descriptors = f->ss_descriptors;
83 descriptors = f->hs_descriptors;
88 descriptors = f->fs_descriptors;
92 * if we can't find any descriptors at all, then this gadget deserves to
93 * Oops with a NULL pointer dereference
100 * next_desc() - advance to the next desc_type descriptor
101 * @t: currect pointer within descriptor array
102 * @desc_type: descriptor type
104 * Return: next desc_type descriptor or NULL
106 * Iterate over @t until either desc_type descriptor found or
107 * NULL (that indicates end of list) encountered
109 static struct usb_descriptor_header**
110 next_desc(struct usb_descriptor_header **t, u8 desc_type)
113 if ((*t)->bDescriptorType == desc_type)
120 * for_each_desc() - iterate over desc_type descriptors in the
122 * @start: pointer within descriptor array.
123 * @iter_desc: desc_type descriptor to use as the loop cursor
124 * @desc_type: wanted descriptr type
126 #define for_each_desc(start, iter_desc, desc_type) \
127 for (iter_desc = next_desc(start, desc_type); \
128 iter_desc; iter_desc = next_desc(iter_desc + 1, desc_type))
131 * config_ep_by_speed_and_alt() - configures the given endpoint
132 * according to gadget speed.
133 * @g: pointer to the gadget
135 * @_ep: the endpoint to configure
136 * @alt: alternate setting number
138 * Return: error code, 0 on success
140 * This function chooses the right descriptors for a given
141 * endpoint according to gadget speed and saves it in the
142 * endpoint desc field. If the endpoint already has a descriptor
143 * assigned to it - overwrites it with currently corresponding
144 * descriptor. The endpoint maxpacket field is updated according
145 * to the chosen descriptor.
146 * Note: the supplied function should hold all the descriptors
147 * for supported speeds
149 int config_ep_by_speed_and_alt(struct usb_gadget *g,
150 struct usb_function *f,
154 struct usb_endpoint_descriptor *chosen_desc = NULL;
155 struct usb_interface_descriptor *int_desc = NULL;
156 struct usb_descriptor_header **speed_desc = NULL;
158 struct usb_ss_ep_comp_descriptor *comp_desc = NULL;
159 int want_comp_desc = 0;
161 struct usb_descriptor_header **d_spd; /* cursor for speed desc */
162 struct usb_composite_dev *cdev;
163 bool incomplete_desc = false;
165 if (!g || !f || !_ep)
168 /* select desired speed */
170 case USB_SPEED_SUPER_PLUS:
171 if (gadget_is_superspeed_plus(g)) {
172 if (f->ssp_descriptors) {
173 speed_desc = f->ssp_descriptors;
177 incomplete_desc = true;
180 case USB_SPEED_SUPER:
181 if (gadget_is_superspeed(g)) {
182 if (f->ss_descriptors) {
183 speed_desc = f->ss_descriptors;
187 incomplete_desc = true;
191 if (gadget_is_dualspeed(g)) {
192 if (f->hs_descriptors) {
193 speed_desc = f->hs_descriptors;
196 incomplete_desc = true;
200 speed_desc = f->fs_descriptors;
203 cdev = get_gadget_data(g);
206 "%s doesn't hold the descriptors for current speed\n",
209 /* find correct alternate setting descriptor */
210 for_each_desc(speed_desc, d_spd, USB_DT_INTERFACE) {
211 int_desc = (struct usb_interface_descriptor *)*d_spd;
213 if (int_desc->bAlternateSetting == alt) {
221 /* find descriptors */
222 for_each_desc(speed_desc, d_spd, USB_DT_ENDPOINT) {
223 chosen_desc = (struct usb_endpoint_descriptor *)*d_spd;
224 if (chosen_desc->bEndpointAddress == _ep->address)
231 _ep->maxpacket = usb_endpoint_maxp(chosen_desc);
232 _ep->desc = chosen_desc;
233 _ep->comp_desc = NULL;
237 if (g->speed == USB_SPEED_HIGH && (usb_endpoint_xfer_isoc(_ep->desc) ||
238 usb_endpoint_xfer_int(_ep->desc)))
239 _ep->mult = usb_endpoint_maxp_mult(_ep->desc);
245 * Companion descriptor should follow EP descriptor
246 * USB 3.0 spec, #9.6.7
248 comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd);
250 (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP))
252 _ep->comp_desc = comp_desc;
253 if (g->speed >= USB_SPEED_SUPER) {
254 switch (usb_endpoint_type(_ep->desc)) {
255 case USB_ENDPOINT_XFER_ISOC:
256 /* mult: bits 1:0 of bmAttributes */
257 _ep->mult = (comp_desc->bmAttributes & 0x3) + 1;
259 case USB_ENDPOINT_XFER_BULK:
260 case USB_ENDPOINT_XFER_INT:
261 _ep->maxburst = comp_desc->bMaxBurst + 1;
264 if (comp_desc->bMaxBurst != 0)
265 ERROR(cdev, "ep0 bMaxBurst must be 0\n");
272 EXPORT_SYMBOL_GPL(config_ep_by_speed_and_alt);
275 * config_ep_by_speed() - configures the given endpoint
276 * according to gadget speed.
277 * @g: pointer to the gadget
279 * @_ep: the endpoint to configure
281 * Return: error code, 0 on success
283 * This function chooses the right descriptors for a given
284 * endpoint according to gadget speed and saves it in the
285 * endpoint desc field. If the endpoint already has a descriptor
286 * assigned to it - overwrites it with currently corresponding
287 * descriptor. The endpoint maxpacket field is updated according
288 * to the chosen descriptor.
289 * Note: the supplied function should hold all the descriptors
290 * for supported speeds
292 int config_ep_by_speed(struct usb_gadget *g,
293 struct usb_function *f,
296 return config_ep_by_speed_and_alt(g, f, _ep, 0);
298 EXPORT_SYMBOL_GPL(config_ep_by_speed);
301 * usb_add_function() - add a function to a configuration
302 * @config: the configuration
303 * @function: the function being added
304 * Context: single threaded during gadget setup
306 * After initialization, each configuration must have one or more
307 * functions added to it. Adding a function involves calling its @bind()
308 * method to allocate resources such as interface and string identifiers
311 * This function returns the value of the function's bind(), which is
312 * zero for success else a negative errno value.
314 int usb_add_function(struct usb_configuration *config,
315 struct usb_function *function)
319 DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n",
320 function->name, function,
321 config->label, config);
323 if (!function->set_alt || !function->disable)
326 function->config = config;
327 list_add_tail(&function->list, &config->functions);
329 if (function->bind_deactivated) {
330 value = usb_function_deactivate(function);
335 /* REVISIT *require* function->bind? */
336 if (function->bind) {
337 value = function->bind(config, function);
339 list_del(&function->list);
340 function->config = NULL;
345 /* We allow configurations that don't work at both speeds.
346 * If we run into a lowspeed Linux system, treat it the same
347 * as full speed ... it's the function drivers that will need
348 * to avoid bulk and ISO transfers.
350 if (!config->fullspeed && function->fs_descriptors)
351 config->fullspeed = true;
352 if (!config->highspeed && function->hs_descriptors)
353 config->highspeed = true;
354 if (!config->superspeed && function->ss_descriptors)
355 config->superspeed = true;
356 if (!config->superspeed_plus && function->ssp_descriptors)
357 config->superspeed_plus = true;
361 DBG(config->cdev, "adding '%s'/%p --> %d\n",
362 function->name, function, value);
365 EXPORT_SYMBOL_GPL(usb_add_function);
367 void usb_remove_function(struct usb_configuration *c, struct usb_function *f)
372 bitmap_zero(f->endpoints, 32);
377 if (f->bind_deactivated)
378 usb_function_activate(f);
380 EXPORT_SYMBOL_GPL(usb_remove_function);
383 * usb_function_deactivate - prevent function and gadget enumeration
384 * @function: the function that isn't yet ready to respond
386 * Blocks response of the gadget driver to host enumeration by
387 * preventing the data line pullup from being activated. This is
388 * normally called during @bind() processing to change from the
389 * initial "ready to respond" state, or when a required resource
392 * For example, drivers that serve as a passthrough to a userspace
393 * daemon can block enumeration unless that daemon (such as an OBEX,
394 * MTP, or print server) is ready to handle host requests.
396 * Not all systems support software control of their USB peripheral
399 * Returns zero on success, else negative errno.
401 int usb_function_deactivate(struct usb_function *function)
403 struct usb_composite_dev *cdev = function->config->cdev;
407 spin_lock_irqsave(&cdev->lock, flags);
409 if (cdev->deactivations == 0) {
410 spin_unlock_irqrestore(&cdev->lock, flags);
411 status = usb_gadget_deactivate(cdev->gadget);
412 spin_lock_irqsave(&cdev->lock, flags);
415 cdev->deactivations++;
417 spin_unlock_irqrestore(&cdev->lock, flags);
420 EXPORT_SYMBOL_GPL(usb_function_deactivate);
423 * usb_function_activate - allow function and gadget enumeration
424 * @function: function on which usb_function_activate() was called
426 * Reverses effect of usb_function_deactivate(). If no more functions
427 * are delaying their activation, the gadget driver will respond to
428 * host enumeration procedures.
430 * Returns zero on success, else negative errno.
432 int usb_function_activate(struct usb_function *function)
434 struct usb_composite_dev *cdev = function->config->cdev;
438 spin_lock_irqsave(&cdev->lock, flags);
440 if (WARN_ON(cdev->deactivations == 0))
443 cdev->deactivations--;
444 if (cdev->deactivations == 0) {
445 spin_unlock_irqrestore(&cdev->lock, flags);
446 status = usb_gadget_activate(cdev->gadget);
447 spin_lock_irqsave(&cdev->lock, flags);
451 spin_unlock_irqrestore(&cdev->lock, flags);
454 EXPORT_SYMBOL_GPL(usb_function_activate);
457 * usb_interface_id() - allocate an unused interface ID
458 * @config: configuration associated with the interface
459 * @function: function handling the interface
460 * Context: single threaded during gadget setup
462 * usb_interface_id() is called from usb_function.bind() callbacks to
463 * allocate new interface IDs. The function driver will then store that
464 * ID in interface, association, CDC union, and other descriptors. It
465 * will also handle any control requests targeted at that interface,
466 * particularly changing its altsetting via set_alt(). There may
467 * also be class-specific or vendor-specific requests to handle.
469 * All interface identifier should be allocated using this routine, to
470 * ensure that for example different functions don't wrongly assign
471 * different meanings to the same identifier. Note that since interface
472 * identifiers are configuration-specific, functions used in more than
473 * one configuration (or more than once in a given configuration) need
474 * multiple versions of the relevant descriptors.
476 * Returns the interface ID which was allocated; or -ENODEV if no
477 * more interface IDs can be allocated.
479 int usb_interface_id(struct usb_configuration *config,
480 struct usb_function *function)
482 unsigned id = config->next_interface_id;
484 if (id < MAX_CONFIG_INTERFACES) {
485 config->interface[id] = function;
486 config->next_interface_id = id + 1;
491 EXPORT_SYMBOL_GPL(usb_interface_id);
493 static u8 encode_bMaxPower(enum usb_device_speed speed,
494 struct usb_configuration *c)
498 if (c->MaxPower || (c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))
501 val = CONFIG_USB_GADGET_VBUS_DRAW;
504 if (speed < USB_SPEED_SUPER)
505 return min(val, 500U) / 2;
508 * USB 3.x supports up to 900mA, but since 900 isn't divisible
509 * by 8 the integral division will effectively cap to 896mA.
511 return min(val, 900U) / 8;
514 static int config_buf(struct usb_configuration *config,
515 enum usb_device_speed speed, void *buf, u8 type)
517 struct usb_config_descriptor *c = buf;
518 void *next = buf + USB_DT_CONFIG_SIZE;
520 struct usb_function *f;
523 len = USB_COMP_EP0_BUFSIZ - USB_DT_CONFIG_SIZE;
524 /* write the config descriptor */
526 c->bLength = USB_DT_CONFIG_SIZE;
527 c->bDescriptorType = type;
528 /* wTotalLength is written later */
529 c->bNumInterfaces = config->next_interface_id;
530 c->bConfigurationValue = config->bConfigurationValue;
531 c->iConfiguration = config->iConfiguration;
532 c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes;
533 c->bMaxPower = encode_bMaxPower(speed, config);
535 /* There may be e.g. OTG descriptors */
536 if (config->descriptors) {
537 status = usb_descriptor_fillbuf(next, len,
538 config->descriptors);
545 /* add each function's descriptors */
546 list_for_each_entry(f, &config->functions, list) {
547 struct usb_descriptor_header **descriptors;
549 descriptors = function_descriptors(f, speed);
552 status = usb_descriptor_fillbuf(next, len,
553 (const struct usb_descriptor_header **) descriptors);
561 c->wTotalLength = cpu_to_le16(len);
565 static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
567 struct usb_gadget *gadget = cdev->gadget;
568 struct usb_configuration *c;
569 struct list_head *pos;
570 u8 type = w_value >> 8;
571 enum usb_device_speed speed = USB_SPEED_UNKNOWN;
573 if (gadget->speed >= USB_SPEED_SUPER)
574 speed = gadget->speed;
575 else if (gadget_is_dualspeed(gadget)) {
577 if (gadget->speed == USB_SPEED_HIGH)
579 if (type == USB_DT_OTHER_SPEED_CONFIG)
582 speed = USB_SPEED_HIGH;
586 /* This is a lookup by config *INDEX* */
589 pos = &cdev->configs;
590 c = cdev->os_desc_config;
594 while ((pos = pos->next) != &cdev->configs) {
595 c = list_entry(pos, typeof(*c), list);
597 /* skip OS Descriptors config which is handled separately */
598 if (c == cdev->os_desc_config)
602 /* ignore configs that won't work at this speed */
604 case USB_SPEED_SUPER_PLUS:
605 if (!c->superspeed_plus)
608 case USB_SPEED_SUPER:
622 return config_buf(c, speed, cdev->req->buf, type);
628 static int count_configs(struct usb_composite_dev *cdev, unsigned type)
630 struct usb_gadget *gadget = cdev->gadget;
631 struct usb_configuration *c;
637 if (gadget_is_dualspeed(gadget)) {
638 if (gadget->speed == USB_SPEED_HIGH)
640 if (gadget->speed == USB_SPEED_SUPER)
642 if (gadget->speed == USB_SPEED_SUPER_PLUS)
644 if (type == USB_DT_DEVICE_QUALIFIER)
647 list_for_each_entry(c, &cdev->configs, list) {
648 /* ignore configs that won't work at this speed */
650 if (!c->superspeed_plus)
668 * bos_desc() - prepares the BOS descriptor.
669 * @cdev: pointer to usb_composite device to generate the bos
672 * This function generates the BOS (Binary Device Object)
673 * descriptor and its device capabilities descriptors. The BOS
674 * descriptor should be supported by a SuperSpeed device.
676 static int bos_desc(struct usb_composite_dev *cdev)
678 struct usb_ext_cap_descriptor *usb_ext;
679 struct usb_dcd_config_params dcd_config_params;
680 struct usb_bos_descriptor *bos = cdev->req->buf;
681 unsigned int besl = 0;
683 bos->bLength = USB_DT_BOS_SIZE;
684 bos->bDescriptorType = USB_DT_BOS;
686 bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
687 bos->bNumDeviceCaps = 0;
689 /* Get Controller configuration */
690 if (cdev->gadget->ops->get_config_params) {
691 cdev->gadget->ops->get_config_params(cdev->gadget,
694 dcd_config_params.besl_baseline =
695 USB_DEFAULT_BESL_UNSPECIFIED;
696 dcd_config_params.besl_deep =
697 USB_DEFAULT_BESL_UNSPECIFIED;
698 dcd_config_params.bU1devExitLat =
699 USB_DEFAULT_U1_DEV_EXIT_LAT;
700 dcd_config_params.bU2DevExitLat =
701 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
704 if (dcd_config_params.besl_baseline != USB_DEFAULT_BESL_UNSPECIFIED)
705 besl = USB_BESL_BASELINE_VALID |
706 USB_SET_BESL_BASELINE(dcd_config_params.besl_baseline);
708 if (dcd_config_params.besl_deep != USB_DEFAULT_BESL_UNSPECIFIED)
709 besl |= USB_BESL_DEEP_VALID |
710 USB_SET_BESL_DEEP(dcd_config_params.besl_deep);
713 * A SuperSpeed device shall include the USB2.0 extension descriptor
714 * and shall support LPM when operating in USB2.0 HS mode.
716 usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
717 bos->bNumDeviceCaps++;
718 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
719 usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
720 usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
721 usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
722 usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT |
723 USB_BESL_SUPPORT | besl);
726 * The Superspeed USB Capability descriptor shall be implemented by all
727 * SuperSpeed devices.
729 if (gadget_is_superspeed(cdev->gadget)) {
730 struct usb_ss_cap_descriptor *ss_cap;
732 ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
733 bos->bNumDeviceCaps++;
734 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
735 ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
736 ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
737 ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
738 ss_cap->bmAttributes = 0; /* LTM is not supported yet */
739 ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
740 USB_FULL_SPEED_OPERATION |
741 USB_HIGH_SPEED_OPERATION |
742 USB_5GBPS_OPERATION);
743 ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
744 ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
745 ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
748 /* The SuperSpeedPlus USB Device Capability descriptor */
749 if (gadget_is_superspeed_plus(cdev->gadget)) {
750 struct usb_ssp_cap_descriptor *ssp_cap;
755 if (cdev->gadget->max_ssp_rate == USB_SSP_GEN_2x2)
759 * Paired RX and TX sublink speed attributes share
762 ssic = (ssac + 1) / 2 - 1;
764 ssp_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
765 bos->bNumDeviceCaps++;
767 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SSP_CAP_SIZE(ssac));
768 ssp_cap->bLength = USB_DT_USB_SSP_CAP_SIZE(ssac);
769 ssp_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
770 ssp_cap->bDevCapabilityType = USB_SSP_CAP_TYPE;
771 ssp_cap->bReserved = 0;
772 ssp_cap->wReserved = 0;
774 ssp_cap->bmAttributes =
775 cpu_to_le32(FIELD_PREP(USB_SSP_SUBLINK_SPEED_ATTRIBS, ssac) |
776 FIELD_PREP(USB_SSP_SUBLINK_SPEED_IDS, ssic));
778 ssp_cap->wFunctionalitySupport =
779 cpu_to_le16(FIELD_PREP(USB_SSP_MIN_SUBLINK_SPEED_ATTRIBUTE_ID, 0) |
780 FIELD_PREP(USB_SSP_MIN_RX_LANE_COUNT, 1) |
781 FIELD_PREP(USB_SSP_MIN_TX_LANE_COUNT, 1));
784 * Use 1 SSID if the gadget supports up to gen2x1 or not
786 * - SSID 0 for symmetric RX/TX sublink speed of 10 Gbps.
788 * Use 1 SSID if the gadget supports up to gen1x2:
789 * - SSID 0 for symmetric RX/TX sublink speed of 5 Gbps.
791 * Use 2 SSIDs if the gadget supports up to gen2x2:
792 * - SSID 0 for symmetric RX/TX sublink speed of 5 Gbps.
793 * - SSID 1 for symmetric RX/TX sublink speed of 10 Gbps.
795 for (i = 0; i < ssac + 1; i++) {
802 if (cdev->gadget->max_ssp_rate == USB_SSP_GEN_2x1 ||
803 cdev->gadget->max_ssp_rate == USB_SSP_GEN_UNKNOWN)
806 mantissa = 5 << ssid;
809 type = USB_SSP_SUBLINK_SPEED_ST_SYM_TX;
811 type = USB_SSP_SUBLINK_SPEED_ST_SYM_RX;
813 ssp_cap->bmSublinkSpeedAttr[i] =
814 cpu_to_le32(FIELD_PREP(USB_SSP_SUBLINK_SPEED_SSID, ssid) |
815 FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSE,
816 USB_SSP_SUBLINK_SPEED_LSE_GBPS) |
817 FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST, type) |
818 FIELD_PREP(USB_SSP_SUBLINK_SPEED_LP,
819 USB_SSP_SUBLINK_SPEED_LP_SSP) |
820 FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSM, mantissa));
824 return le16_to_cpu(bos->wTotalLength);
827 static void device_qual(struct usb_composite_dev *cdev)
829 struct usb_qualifier_descriptor *qual = cdev->req->buf;
831 qual->bLength = sizeof(*qual);
832 qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
833 /* POLICY: same bcdUSB and device type info at both speeds */
834 qual->bcdUSB = cdev->desc.bcdUSB;
835 qual->bDeviceClass = cdev->desc.bDeviceClass;
836 qual->bDeviceSubClass = cdev->desc.bDeviceSubClass;
837 qual->bDeviceProtocol = cdev->desc.bDeviceProtocol;
838 /* ASSUME same EP0 fifo size at both speeds */
839 qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket;
840 qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER);
844 /*-------------------------------------------------------------------------*/
846 static void reset_config(struct usb_composite_dev *cdev)
848 struct usb_function *f;
850 DBG(cdev, "reset config\n");
852 list_for_each_entry(f, &cdev->config->functions, list) {
856 bitmap_zero(f->endpoints, 32);
859 cdev->delayed_status = 0;
862 static int set_config(struct usb_composite_dev *cdev,
863 const struct usb_ctrlrequest *ctrl, unsigned number)
865 struct usb_gadget *gadget = cdev->gadget;
866 struct usb_configuration *c = NULL;
867 int result = -EINVAL;
868 unsigned power = gadget_is_otg(gadget) ? 8 : 100;
872 list_for_each_entry(c, &cdev->configs, list) {
873 if (c->bConfigurationValue == number) {
875 * We disable the FDs of the previous
876 * configuration only if the new configuration
887 } else { /* Zero configuration value - need to reset the config */
893 DBG(cdev, "%s config #%d: %s\n",
894 usb_speed_string(gadget->speed),
895 number, c ? c->label : "unconfigured");
900 usb_gadget_set_state(gadget, USB_STATE_CONFIGURED);
903 /* Initialize all interfaces by setting them to altsetting zero. */
904 for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) {
905 struct usb_function *f = c->interface[tmp];
906 struct usb_descriptor_header **descriptors;
912 * Record which endpoints are used by the function. This is used
913 * to dispatch control requests targeted at that endpoint to the
914 * function's setup callback instead of the current
915 * configuration's setup callback.
917 descriptors = function_descriptors(f, gadget->speed);
919 for (; *descriptors; ++descriptors) {
920 struct usb_endpoint_descriptor *ep;
923 if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT)
926 ep = (struct usb_endpoint_descriptor *)*descriptors;
927 addr = ((ep->bEndpointAddress & 0x80) >> 3)
928 | (ep->bEndpointAddress & 0x0f);
929 set_bit(addr, f->endpoints);
932 result = f->set_alt(f, tmp, 0);
934 DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n",
935 tmp, f->name, f, result);
941 if (result == USB_GADGET_DELAYED_STATUS) {
943 "%s: interface %d (%s) requested delayed status\n",
944 __func__, tmp, f->name);
945 cdev->delayed_status++;
946 DBG(cdev, "delayed_status count %d\n",
947 cdev->delayed_status);
951 /* when we return, be sure our power usage is valid */
952 if (c->MaxPower || (c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))
955 power = CONFIG_USB_GADGET_VBUS_DRAW;
957 if (gadget->speed < USB_SPEED_SUPER)
958 power = min(power, 500U);
960 power = min(power, 900U);
962 if (power <= USB_SELF_POWER_VBUS_MAX_DRAW)
963 usb_gadget_set_selfpowered(gadget);
965 usb_gadget_clear_selfpowered(gadget);
967 usb_gadget_vbus_draw(gadget, power);
968 if (result >= 0 && cdev->delayed_status)
969 result = USB_GADGET_DELAYED_STATUS;
973 int usb_add_config_only(struct usb_composite_dev *cdev,
974 struct usb_configuration *config)
976 struct usb_configuration *c;
978 if (!config->bConfigurationValue)
981 /* Prevent duplicate configuration identifiers */
982 list_for_each_entry(c, &cdev->configs, list) {
983 if (c->bConfigurationValue == config->bConfigurationValue)
988 list_add_tail(&config->list, &cdev->configs);
990 INIT_LIST_HEAD(&config->functions);
991 config->next_interface_id = 0;
992 memset(config->interface, 0, sizeof(config->interface));
996 EXPORT_SYMBOL_GPL(usb_add_config_only);
999 * usb_add_config() - add a configuration to a device.
1000 * @cdev: wraps the USB gadget
1001 * @config: the configuration, with bConfigurationValue assigned
1002 * @bind: the configuration's bind function
1003 * Context: single threaded during gadget setup
1005 * One of the main tasks of a composite @bind() routine is to
1006 * add each of the configurations it supports, using this routine.
1008 * This function returns the value of the configuration's @bind(), which
1009 * is zero for success else a negative errno value. Binding configurations
1010 * assigns global resources including string IDs, and per-configuration
1011 * resources such as interface IDs and endpoints.
1013 int usb_add_config(struct usb_composite_dev *cdev,
1014 struct usb_configuration *config,
1015 int (*bind)(struct usb_configuration *))
1017 int status = -EINVAL;
1022 DBG(cdev, "adding config #%u '%s'/%p\n",
1023 config->bConfigurationValue,
1024 config->label, config);
1026 status = usb_add_config_only(cdev, config);
1030 status = bind(config);
1032 while (!list_empty(&config->functions)) {
1033 struct usb_function *f;
1035 f = list_first_entry(&config->functions,
1036 struct usb_function, list);
1039 DBG(cdev, "unbind function '%s'/%p\n",
1041 f->unbind(config, f);
1042 /* may free memory for "f" */
1045 list_del(&config->list);
1046 config->cdev = NULL;
1050 DBG(cdev, "cfg %d/%p speeds:%s%s%s%s\n",
1051 config->bConfigurationValue, config,
1052 config->superspeed_plus ? " superplus" : "",
1053 config->superspeed ? " super" : "",
1054 config->highspeed ? " high" : "",
1056 ? (gadget_is_dualspeed(cdev->gadget)
1061 for (i = 0; i < MAX_CONFIG_INTERFACES; i++) {
1062 struct usb_function *f = config->interface[i];
1066 DBG(cdev, " interface %d = %s/%p\n",
1071 /* set_alt(), or next bind(), sets up ep->claimed as needed */
1072 usb_ep_autoconfig_reset(cdev->gadget);
1076 DBG(cdev, "added config '%s'/%u --> %d\n", config->label,
1077 config->bConfigurationValue, status);
1080 EXPORT_SYMBOL_GPL(usb_add_config);
1082 static void remove_config(struct usb_composite_dev *cdev,
1083 struct usb_configuration *config)
1085 while (!list_empty(&config->functions)) {
1086 struct usb_function *f;
1088 f = list_first_entry(&config->functions,
1089 struct usb_function, list);
1091 usb_remove_function(config, f);
1093 list_del(&config->list);
1094 if (config->unbind) {
1095 DBG(cdev, "unbind config '%s'/%p\n", config->label, config);
1096 config->unbind(config);
1097 /* may free memory for "c" */
1102 * usb_remove_config() - remove a configuration from a device.
1103 * @cdev: wraps the USB gadget
1104 * @config: the configuration
1106 * Drivers must call usb_gadget_disconnect before calling this function
1107 * to disconnect the device from the host and make sure the host will not
1108 * try to enumerate the device while we are changing the config list.
1110 void usb_remove_config(struct usb_composite_dev *cdev,
1111 struct usb_configuration *config)
1113 unsigned long flags;
1115 spin_lock_irqsave(&cdev->lock, flags);
1117 if (cdev->config == config)
1120 spin_unlock_irqrestore(&cdev->lock, flags);
1122 remove_config(cdev, config);
1125 /*-------------------------------------------------------------------------*/
1127 /* We support strings in multiple languages ... string descriptor zero
1128 * says which languages are supported. The typical case will be that
1129 * only one language (probably English) is used, with i18n handled on
1133 static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf)
1135 const struct usb_gadget_strings *s;
1141 language = cpu_to_le16(s->language);
1142 for (tmp = buf; *tmp && tmp < &buf[USB_MAX_STRING_LEN]; tmp++) {
1143 if (*tmp == language)
1152 static int lookup_string(
1153 struct usb_gadget_strings **sp,
1159 struct usb_gadget_strings *s;
1164 if (s->language != language)
1166 value = usb_gadget_get_string(s, id, buf);
1173 static int get_string(struct usb_composite_dev *cdev,
1174 void *buf, u16 language, int id)
1176 struct usb_composite_driver *composite = cdev->driver;
1177 struct usb_gadget_string_container *uc;
1178 struct usb_configuration *c;
1179 struct usb_function *f;
1182 /* Yes, not only is USB's i18n support probably more than most
1183 * folk will ever care about ... also, it's all supported here.
1184 * (Except for UTF8 support for Unicode's "Astral Planes".)
1187 /* 0 == report all available language codes */
1189 struct usb_string_descriptor *s = buf;
1190 struct usb_gadget_strings **sp;
1193 s->bDescriptorType = USB_DT_STRING;
1195 sp = composite->strings;
1197 collect_langs(sp, s->wData);
1199 list_for_each_entry(c, &cdev->configs, list) {
1202 collect_langs(sp, s->wData);
1204 list_for_each_entry(f, &c->functions, list) {
1207 collect_langs(sp, s->wData);
1210 list_for_each_entry(uc, &cdev->gstrings, list) {
1211 struct usb_gadget_strings **sp;
1213 sp = get_containers_gs(uc);
1214 collect_langs(sp, s->wData);
1217 for (len = 0; len <= USB_MAX_STRING_LEN && s->wData[len]; len++)
1222 s->bLength = 2 * (len + 1);
1226 if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) {
1227 struct usb_os_string *b = buf;
1228 b->bLength = sizeof(*b);
1229 b->bDescriptorType = USB_DT_STRING;
1231 sizeof(b->qwSignature) == sizeof(cdev->qw_sign),
1232 "qwSignature size must be equal to qw_sign");
1233 memcpy(&b->qwSignature, cdev->qw_sign, sizeof(b->qwSignature));
1234 b->bMS_VendorCode = cdev->b_vendor_code;
1239 list_for_each_entry(uc, &cdev->gstrings, list) {
1240 struct usb_gadget_strings **sp;
1242 sp = get_containers_gs(uc);
1243 len = lookup_string(sp, buf, language, id);
1248 /* String IDs are device-scoped, so we look up each string
1249 * table we're told about. These lookups are infrequent;
1250 * simpler-is-better here.
1252 if (composite->strings) {
1253 len = lookup_string(composite->strings, buf, language, id);
1257 list_for_each_entry(c, &cdev->configs, list) {
1259 len = lookup_string(c->strings, buf, language, id);
1263 list_for_each_entry(f, &c->functions, list) {
1266 len = lookup_string(f->strings, buf, language, id);
1275 * usb_string_id() - allocate an unused string ID
1276 * @cdev: the device whose string descriptor IDs are being allocated
1277 * Context: single threaded during gadget setup
1279 * @usb_string_id() is called from bind() callbacks to allocate
1280 * string IDs. Drivers for functions, configurations, or gadgets will
1281 * then store that ID in the appropriate descriptors and string table.
1283 * All string identifier should be allocated using this,
1284 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
1285 * that for example different functions don't wrongly assign different
1286 * meanings to the same identifier.
1288 int usb_string_id(struct usb_composite_dev *cdev)
1290 if (cdev->next_string_id < 254) {
1291 /* string id 0 is reserved by USB spec for list of
1292 * supported languages */
1293 /* 255 reserved as well? -- mina86 */
1294 cdev->next_string_id++;
1295 return cdev->next_string_id;
1299 EXPORT_SYMBOL_GPL(usb_string_id);
1302 * usb_string_ids_tab() - allocate unused string IDs in batch
1303 * @cdev: the device whose string descriptor IDs are being allocated
1304 * @str: an array of usb_string objects to assign numbers to
1305 * Context: single threaded during gadget setup
1307 * @usb_string_ids() is called from bind() callbacks to allocate
1308 * string IDs. Drivers for functions, configurations, or gadgets will
1309 * then copy IDs from the string table to the appropriate descriptors
1310 * and string table for other languages.
1312 * All string identifier should be allocated using this,
1313 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1314 * example different functions don't wrongly assign different meanings
1315 * to the same identifier.
1317 int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
1319 int next = cdev->next_string_id;
1321 for (; str->s; ++str) {
1322 if (unlikely(next >= 254))
1327 cdev->next_string_id = next;
1331 EXPORT_SYMBOL_GPL(usb_string_ids_tab);
1333 static struct usb_gadget_string_container *copy_gadget_strings(
1334 struct usb_gadget_strings **sp, unsigned n_gstrings,
1337 struct usb_gadget_string_container *uc;
1338 struct usb_gadget_strings **gs_array;
1339 struct usb_gadget_strings *gs;
1340 struct usb_string *s;
1347 mem += sizeof(void *) * (n_gstrings + 1);
1348 mem += sizeof(struct usb_gadget_strings) * n_gstrings;
1349 mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings);
1350 uc = kmalloc(mem, GFP_KERNEL);
1352 return ERR_PTR(-ENOMEM);
1353 gs_array = get_containers_gs(uc);
1355 stash += sizeof(void *) * (n_gstrings + 1);
1356 for (n_gs = 0; n_gs < n_gstrings; n_gs++) {
1357 struct usb_string *org_s;
1359 gs_array[n_gs] = stash;
1360 gs = gs_array[n_gs];
1361 stash += sizeof(struct usb_gadget_strings);
1362 gs->language = sp[n_gs]->language;
1363 gs->strings = stash;
1364 org_s = sp[n_gs]->strings;
1366 for (n_s = 0; n_s < n_strings; n_s++) {
1368 stash += sizeof(struct usb_string);
1377 stash += sizeof(struct usb_string);
1380 gs_array[n_gs] = NULL;
1385 * usb_gstrings_attach() - attach gadget strings to a cdev and assign ids
1386 * @cdev: the device whose string descriptor IDs are being allocated
1388 * @sp: an array of usb_gadget_strings to attach.
1389 * @n_strings: number of entries in each usb_strings array (sp[]->strings)
1391 * This function will create a deep copy of usb_gadget_strings and usb_string
1392 * and attach it to the cdev. The actual string (usb_string.s) will not be
1393 * copied but only a referenced will be made. The struct usb_gadget_strings
1394 * array may contain multiple languages and should be NULL terminated.
1395 * The ->language pointer of each struct usb_gadget_strings has to contain the
1396 * same amount of entries.
1397 * For instance: sp[0] is en-US, sp[1] is es-ES. It is expected that the first
1398 * usb_string entry of es-ES contains the translation of the first usb_string
1399 * entry of en-US. Therefore both entries become the same id assign.
1401 struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
1402 struct usb_gadget_strings **sp, unsigned n_strings)
1404 struct usb_gadget_string_container *uc;
1405 struct usb_gadget_strings **n_gs;
1406 unsigned n_gstrings = 0;
1410 for (i = 0; sp[i]; i++)
1414 return ERR_PTR(-EINVAL);
1416 uc = copy_gadget_strings(sp, n_gstrings, n_strings);
1418 return ERR_CAST(uc);
1420 n_gs = get_containers_gs(uc);
1421 ret = usb_string_ids_tab(cdev, n_gs[0]->strings);
1425 for (i = 1; i < n_gstrings; i++) {
1426 struct usb_string *m_s;
1427 struct usb_string *s;
1430 m_s = n_gs[0]->strings;
1431 s = n_gs[i]->strings;
1432 for (n = 0; n < n_strings; n++) {
1438 list_add_tail(&uc->list, &cdev->gstrings);
1439 return n_gs[0]->strings;
1442 return ERR_PTR(ret);
1444 EXPORT_SYMBOL_GPL(usb_gstrings_attach);
1447 * usb_string_ids_n() - allocate unused string IDs in batch
1448 * @c: the device whose string descriptor IDs are being allocated
1449 * @n: number of string IDs to allocate
1450 * Context: single threaded during gadget setup
1452 * Returns the first requested ID. This ID and next @n-1 IDs are now
1453 * valid IDs. At least provided that @n is non-zero because if it
1454 * is, returns last requested ID which is now very useful information.
1456 * @usb_string_ids_n() is called from bind() callbacks to allocate
1457 * string IDs. Drivers for functions, configurations, or gadgets will
1458 * then store that ID in the appropriate descriptors and string table.
1460 * All string identifier should be allocated using this,
1461 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1462 * example different functions don't wrongly assign different meanings
1463 * to the same identifier.
1465 int usb_string_ids_n(struct usb_composite_dev *c, unsigned n)
1467 unsigned next = c->next_string_id;
1468 if (unlikely(n > 254 || (unsigned)next + n > 254))
1470 c->next_string_id += n;
1473 EXPORT_SYMBOL_GPL(usb_string_ids_n);
1475 /*-------------------------------------------------------------------------*/
1477 static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
1479 struct usb_composite_dev *cdev;
1481 if (req->status || req->actual != req->length)
1482 DBG((struct usb_composite_dev *) ep->driver_data,
1483 "setup complete --> %d, %d/%d\n",
1484 req->status, req->actual, req->length);
1487 * REVIST The same ep0 requests are shared with function drivers
1488 * so they don't have to maintain the same ->complete() stubs.
1490 * Because of that, we need to check for the validity of ->context
1491 * here, even though we know we've set it to something useful.
1496 cdev = req->context;
1498 if (cdev->req == req)
1499 cdev->setup_pending = false;
1500 else if (cdev->os_desc_req == req)
1501 cdev->os_desc_pending = false;
1503 WARN(1, "unknown request %p\n", req);
1506 static int composite_ep0_queue(struct usb_composite_dev *cdev,
1507 struct usb_request *req, gfp_t gfp_flags)
1511 ret = usb_ep_queue(cdev->gadget->ep0, req, gfp_flags);
1513 if (cdev->req == req)
1514 cdev->setup_pending = true;
1515 else if (cdev->os_desc_req == req)
1516 cdev->os_desc_pending = true;
1518 WARN(1, "unknown request %p\n", req);
1524 static int count_ext_compat(struct usb_configuration *c)
1529 for (i = 0; i < c->next_interface_id; ++i) {
1530 struct usb_function *f;
1533 f = c->interface[i];
1534 for (j = 0; j < f->os_desc_n; ++j) {
1535 struct usb_os_desc *d;
1537 if (i != f->os_desc_table[j].if_id)
1539 d = f->os_desc_table[j].os_desc;
1540 if (d && d->ext_compat_id)
1548 static int fill_ext_compat(struct usb_configuration *c, u8 *buf)
1554 for (i = 0; i < c->next_interface_id; ++i) {
1555 struct usb_function *f;
1558 f = c->interface[i];
1559 for (j = 0; j < f->os_desc_n; ++j) {
1560 struct usb_os_desc *d;
1562 if (i != f->os_desc_table[j].if_id)
1564 d = f->os_desc_table[j].os_desc;
1565 if (d && d->ext_compat_id) {
1568 memcpy(buf, d->ext_compat_id, 16);
1576 if (count + 24 >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1584 static int count_ext_prop(struct usb_configuration *c, int interface)
1586 struct usb_function *f;
1589 f = c->interface[interface];
1590 for (j = 0; j < f->os_desc_n; ++j) {
1591 struct usb_os_desc *d;
1593 if (interface != f->os_desc_table[j].if_id)
1595 d = f->os_desc_table[j].os_desc;
1596 if (d && d->ext_compat_id)
1597 return d->ext_prop_count;
1602 static int len_ext_prop(struct usb_configuration *c, int interface)
1604 struct usb_function *f;
1605 struct usb_os_desc *d;
1608 res = 10; /* header length */
1609 f = c->interface[interface];
1610 for (j = 0; j < f->os_desc_n; ++j) {
1611 if (interface != f->os_desc_table[j].if_id)
1613 d = f->os_desc_table[j].os_desc;
1615 return min(res + d->ext_prop_len, 4096);
1620 static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
1622 struct usb_function *f;
1623 struct usb_os_desc *d;
1624 struct usb_os_desc_ext_prop *ext_prop;
1625 int j, count, n, ret;
1627 f = c->interface[interface];
1628 count = 10; /* header length */
1630 for (j = 0; j < f->os_desc_n; ++j) {
1631 if (interface != f->os_desc_table[j].if_id)
1633 d = f->os_desc_table[j].os_desc;
1635 list_for_each_entry(ext_prop, &d->ext_prop, entry) {
1636 n = ext_prop->data_len +
1637 ext_prop->name_len + 14;
1638 if (count + n >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1640 usb_ext_prop_put_size(buf, n);
1641 usb_ext_prop_put_type(buf, ext_prop->type);
1642 ret = usb_ext_prop_put_name(buf, ext_prop->name,
1643 ext_prop->name_len);
1646 switch (ext_prop->type) {
1647 case USB_EXT_PROP_UNICODE:
1648 case USB_EXT_PROP_UNICODE_ENV:
1649 case USB_EXT_PROP_UNICODE_LINK:
1650 usb_ext_prop_put_unicode(buf, ret,
1652 ext_prop->data_len);
1654 case USB_EXT_PROP_BINARY:
1655 usb_ext_prop_put_binary(buf, ret,
1657 ext_prop->data_len);
1659 case USB_EXT_PROP_LE32:
1660 /* not implemented */
1661 case USB_EXT_PROP_BE32:
1662 /* not implemented */
1675 * The setup() callback implements all the ep0 functionality that's
1676 * not handled lower down, in hardware or the hardware driver(like
1677 * device and endpoint feature flags, and their status). It's all
1678 * housekeeping for the gadget function we're implementing. Most of
1679 * the work is in config and function specific setup.
1682 composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1684 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1685 struct usb_request *req = cdev->req;
1686 int value = -EOPNOTSUPP;
1688 u16 w_index = le16_to_cpu(ctrl->wIndex);
1689 u8 intf = w_index & 0xFF;
1690 u16 w_value = le16_to_cpu(ctrl->wValue);
1691 u16 w_length = le16_to_cpu(ctrl->wLength);
1692 struct usb_function *f = NULL;
1695 if (w_length > USB_COMP_EP0_BUFSIZ) {
1696 if (ctrl->bRequestType == USB_DIR_OUT) {
1699 /* Cast away the const, we are going to overwrite on purpose. */
1700 __le16 *temp = (__le16 *)&ctrl->wLength;
1702 *temp = cpu_to_le16(USB_COMP_EP0_BUFSIZ);
1703 w_length = USB_COMP_EP0_BUFSIZ;
1707 /* partial re-init of the response message; the function or the
1708 * gadget might need to intercept e.g. a control-OUT completion
1709 * when we delegate to it.
1712 req->context = cdev;
1713 req->complete = composite_setup_complete;
1715 gadget->ep0->driver_data = cdev;
1718 * Don't let non-standard requests match any of the cases below
1721 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
1724 switch (ctrl->bRequest) {
1726 /* we handle all standard USB descriptors */
1727 case USB_REQ_GET_DESCRIPTOR:
1728 if (ctrl->bRequestType != USB_DIR_IN)
1730 switch (w_value >> 8) {
1733 cdev->desc.bNumConfigurations =
1734 count_configs(cdev, USB_DT_DEVICE);
1735 cdev->desc.bMaxPacketSize0 =
1736 cdev->gadget->ep0->maxpacket;
1737 if (gadget_is_superspeed(gadget)) {
1738 if (gadget->speed >= USB_SPEED_SUPER) {
1739 cdev->desc.bcdUSB = cpu_to_le16(0x0320);
1740 cdev->desc.bMaxPacketSize0 = 9;
1742 cdev->desc.bcdUSB = cpu_to_le16(0x0210);
1745 if (gadget->lpm_capable)
1746 cdev->desc.bcdUSB = cpu_to_le16(0x0201);
1748 cdev->desc.bcdUSB = cpu_to_le16(0x0200);
1751 value = min(w_length, (u16) sizeof cdev->desc);
1752 memcpy(req->buf, &cdev->desc, value);
1754 case USB_DT_DEVICE_QUALIFIER:
1755 if (!gadget_is_dualspeed(gadget) ||
1756 gadget->speed >= USB_SPEED_SUPER)
1759 value = min_t(int, w_length,
1760 sizeof(struct usb_qualifier_descriptor));
1762 case USB_DT_OTHER_SPEED_CONFIG:
1763 if (!gadget_is_dualspeed(gadget) ||
1764 gadget->speed >= USB_SPEED_SUPER)
1768 value = config_desc(cdev, w_value);
1770 value = min(w_length, (u16) value);
1773 value = get_string(cdev, req->buf,
1774 w_index, w_value & 0xff);
1776 value = min(w_length, (u16) value);
1779 if (gadget_is_superspeed(gadget) ||
1780 gadget->lpm_capable) {
1781 value = bos_desc(cdev);
1782 value = min(w_length, (u16) value);
1786 if (gadget_is_otg(gadget)) {
1787 struct usb_configuration *config;
1788 int otg_desc_len = 0;
1791 config = cdev->config;
1793 config = list_first_entry(
1795 struct usb_configuration, list);
1799 if (gadget->otg_caps &&
1800 (gadget->otg_caps->otg_rev >= 0x0200))
1801 otg_desc_len += sizeof(
1802 struct usb_otg20_descriptor);
1804 otg_desc_len += sizeof(
1805 struct usb_otg_descriptor);
1807 value = min_t(int, w_length, otg_desc_len);
1808 memcpy(req->buf, config->descriptors[0], value);
1814 /* any number of configs can work */
1815 case USB_REQ_SET_CONFIGURATION:
1816 if (ctrl->bRequestType != 0)
1818 if (gadget_is_otg(gadget)) {
1819 if (gadget->a_hnp_support)
1820 DBG(cdev, "HNP available\n");
1821 else if (gadget->a_alt_hnp_support)
1822 DBG(cdev, "HNP on another port\n");
1824 VDBG(cdev, "HNP inactive\n");
1826 spin_lock(&cdev->lock);
1827 value = set_config(cdev, ctrl, w_value);
1828 spin_unlock(&cdev->lock);
1830 case USB_REQ_GET_CONFIGURATION:
1831 if (ctrl->bRequestType != USB_DIR_IN)
1834 *(u8 *)req->buf = cdev->config->bConfigurationValue;
1836 *(u8 *)req->buf = 0;
1837 value = min(w_length, (u16) 1);
1840 /* function drivers must handle get/set altsetting */
1841 case USB_REQ_SET_INTERFACE:
1842 if (ctrl->bRequestType != USB_RECIP_INTERFACE)
1844 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1846 f = cdev->config->interface[intf];
1851 * If there's no get_alt() method, we know only altsetting zero
1852 * works. There is no need to check if set_alt() is not NULL
1853 * as we check this in usb_add_function().
1855 if (w_value && !f->get_alt)
1858 spin_lock(&cdev->lock);
1859 value = f->set_alt(f, w_index, w_value);
1860 if (value == USB_GADGET_DELAYED_STATUS) {
1862 "%s: interface %d (%s) requested delayed status\n",
1863 __func__, intf, f->name);
1864 cdev->delayed_status++;
1865 DBG(cdev, "delayed_status count %d\n",
1866 cdev->delayed_status);
1868 spin_unlock(&cdev->lock);
1870 case USB_REQ_GET_INTERFACE:
1871 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
1873 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1875 f = cdev->config->interface[intf];
1878 /* lots of interfaces only need altsetting zero... */
1879 value = f->get_alt ? f->get_alt(f, w_index) : 0;
1882 *((u8 *)req->buf) = value;
1883 value = min(w_length, (u16) 1);
1885 case USB_REQ_GET_STATUS:
1886 if (gadget_is_otg(gadget) && gadget->hnp_polling_support &&
1887 (w_index == OTG_STS_SELECTOR)) {
1888 if (ctrl->bRequestType != (USB_DIR_IN |
1891 *((u8 *)req->buf) = gadget->host_request_flag;
1897 * USB 3.0 additions:
1898 * Function driver should handle get_status request. If such cb
1899 * wasn't supplied we respond with default value = 0
1900 * Note: function driver should supply such cb only for the
1901 * first interface of the function
1903 if (!gadget_is_superspeed(gadget))
1905 if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
1907 value = 2; /* This is the length of the get_status reply */
1908 put_unaligned_le16(0, req->buf);
1909 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1911 f = cdev->config->interface[intf];
1914 status = f->get_status ? f->get_status(f) : 0;
1917 put_unaligned_le16(status & 0x0000ffff, req->buf);
1920 * Function drivers should handle SetFeature/ClearFeature
1921 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
1922 * only for the first interface of the function
1924 case USB_REQ_CLEAR_FEATURE:
1925 case USB_REQ_SET_FEATURE:
1926 if (!gadget_is_superspeed(gadget))
1928 if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE))
1931 case USB_INTRF_FUNC_SUSPEND:
1932 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1934 f = cdev->config->interface[intf];
1938 if (f->func_suspend)
1939 value = f->func_suspend(f, w_index >> 8);
1942 "func_suspend() returned error %d\n",
1952 * OS descriptors handling
1954 if (cdev->use_os_string && cdev->os_desc_config &&
1955 (ctrl->bRequestType & USB_TYPE_VENDOR) &&
1956 ctrl->bRequest == cdev->b_vendor_code) {
1957 struct usb_configuration *os_desc_cfg;
1962 req = cdev->os_desc_req;
1963 req->context = cdev;
1964 req->complete = composite_setup_complete;
1966 os_desc_cfg = cdev->os_desc_config;
1967 w_length = min_t(u16, w_length, USB_COMP_EP0_OS_DESC_BUFSIZ);
1968 memset(buf, 0, w_length);
1970 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1971 case USB_RECIP_DEVICE:
1972 if (w_index != 0x4 || (w_value >> 8))
1975 /* Number of ext compat interfaces */
1976 count = count_ext_compat(os_desc_cfg);
1978 count *= 24; /* 24 B/ext compat desc */
1979 count += 16; /* header */
1980 put_unaligned_le32(count, buf);
1982 if (w_length > 0x10) {
1983 value = fill_ext_compat(os_desc_cfg, buf);
1984 value = min_t(u16, w_length, value);
1987 case USB_RECIP_INTERFACE:
1988 if (w_index != 0x5 || (w_value >> 8))
1990 interface = w_value & 0xFF;
1992 count = count_ext_prop(os_desc_cfg,
1994 put_unaligned_le16(count, buf + 8);
1995 count = len_ext_prop(os_desc_cfg,
1997 put_unaligned_le32(count, buf);
1999 if (w_length > 0x0A) {
2000 value = fill_ext_prop(os_desc_cfg,
2003 value = min_t(u16, w_length, value);
2012 "non-core control req%02x.%02x v%04x i%04x l%d\n",
2013 ctrl->bRequestType, ctrl->bRequest,
2014 w_value, w_index, w_length);
2016 /* functions always handle their interfaces and endpoints...
2017 * punt other recipients (other, WUSB, ...) to the current
2018 * configuration code.
2021 list_for_each_entry(f, &cdev->config->functions, list)
2023 f->req_match(f, ctrl, false))
2026 struct usb_configuration *c;
2027 list_for_each_entry(c, &cdev->configs, list)
2028 list_for_each_entry(f, &c->functions, list)
2030 f->req_match(f, ctrl, true))
2035 switch (ctrl->bRequestType & USB_RECIP_MASK) {
2036 case USB_RECIP_INTERFACE:
2037 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
2039 f = cdev->config->interface[intf];
2042 case USB_RECIP_ENDPOINT:
2045 endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f);
2046 list_for_each_entry(f, &cdev->config->functions, list) {
2047 if (test_bit(endp, f->endpoints))
2050 if (&f->list == &cdev->config->functions)
2056 value = f->setup(f, ctrl);
2058 struct usb_configuration *c;
2064 /* try current config's setup */
2066 value = c->setup(c, ctrl);
2070 /* try the only function in the current config */
2071 if (!list_is_singular(&c->functions))
2073 f = list_first_entry(&c->functions, struct usb_function,
2076 value = f->setup(f, ctrl);
2083 /* respond with data transfer before status phase? */
2084 if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) {
2085 req->length = value;
2086 req->context = cdev;
2087 req->zero = value < w_length;
2088 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2090 DBG(cdev, "ep_queue --> %d\n", value);
2092 composite_setup_complete(gadget->ep0, req);
2094 } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) {
2096 "%s: Delayed status not supported for w_length != 0",
2101 /* device either stalls (value < 0) or reports success */
2105 static void __composite_disconnect(struct usb_gadget *gadget)
2107 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2108 unsigned long flags;
2110 /* REVISIT: should we have config and device level
2111 * disconnect callbacks?
2113 spin_lock_irqsave(&cdev->lock, flags);
2114 cdev->suspended = 0;
2117 if (cdev->driver->disconnect)
2118 cdev->driver->disconnect(cdev);
2119 spin_unlock_irqrestore(&cdev->lock, flags);
2122 void composite_disconnect(struct usb_gadget *gadget)
2124 usb_gadget_vbus_draw(gadget, 0);
2125 __composite_disconnect(gadget);
2128 void composite_reset(struct usb_gadget *gadget)
2131 * Section 1.4.13 Standard Downstream Port of the USB battery charging
2132 * specification v1.2 states that a device connected on a SDP shall only
2133 * draw at max 100mA while in a connected, but unconfigured state.
2135 usb_gadget_vbus_draw(gadget, 100);
2136 __composite_disconnect(gadget);
2139 /*-------------------------------------------------------------------------*/
2141 static ssize_t suspended_show(struct device *dev, struct device_attribute *attr,
2144 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
2145 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2147 return sprintf(buf, "%d\n", cdev->suspended);
2149 static DEVICE_ATTR_RO(suspended);
2151 static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
2153 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2154 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2155 struct usb_string *dev_str = gstr->strings;
2157 /* composite_disconnect() must already have been called
2158 * by the underlying peripheral controller driver!
2159 * so there's no i/o concurrency that could affect the
2160 * state protected by cdev->lock.
2162 WARN_ON(cdev->config);
2164 while (!list_empty(&cdev->configs)) {
2165 struct usb_configuration *c;
2166 c = list_first_entry(&cdev->configs,
2167 struct usb_configuration, list);
2168 remove_config(cdev, c);
2170 if (cdev->driver->unbind && unbind_driver)
2171 cdev->driver->unbind(cdev);
2173 composite_dev_cleanup(cdev);
2175 if (dev_str[USB_GADGET_MANUFACTURER_IDX].s == cdev->def_manufacturer)
2176 dev_str[USB_GADGET_MANUFACTURER_IDX].s = "";
2178 kfree(cdev->def_manufacturer);
2180 set_gadget_data(gadget, NULL);
2183 static void composite_unbind(struct usb_gadget *gadget)
2185 __composite_unbind(gadget, true);
2188 static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
2189 const struct usb_device_descriptor *old)
2199 * these variables may have been set in
2200 * usb_composite_overwrite_options()
2202 idVendor = new->idVendor;
2203 idProduct = new->idProduct;
2204 bcdDevice = new->bcdDevice;
2205 iSerialNumber = new->iSerialNumber;
2206 iManufacturer = new->iManufacturer;
2207 iProduct = new->iProduct;
2211 new->idVendor = idVendor;
2213 new->idProduct = idProduct;
2215 new->bcdDevice = bcdDevice;
2217 new->bcdDevice = cpu_to_le16(get_default_bcdDevice());
2219 new->iSerialNumber = iSerialNumber;
2221 new->iManufacturer = iManufacturer;
2223 new->iProduct = iProduct;
2226 int composite_dev_prepare(struct usb_composite_driver *composite,
2227 struct usb_composite_dev *cdev)
2229 struct usb_gadget *gadget = cdev->gadget;
2232 /* preallocate control response and buffer */
2233 cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
2237 cdev->req->buf = kzalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
2238 if (!cdev->req->buf)
2241 ret = device_create_file(&gadget->dev, &dev_attr_suspended);
2245 cdev->req->complete = composite_setup_complete;
2246 cdev->req->context = cdev;
2247 gadget->ep0->driver_data = cdev;
2249 cdev->driver = composite;
2252 * As per USB compliance update, a device that is actively drawing
2253 * more than 100mA from USB must report itself as bus-powered in
2254 * the GetStatus(DEVICE) call.
2256 if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW)
2257 usb_gadget_set_selfpowered(gadget);
2259 /* interface and string IDs start at zero via kzalloc.
2260 * we force endpoints to start unassigned; few controller
2261 * drivers will zero ep->driver_data.
2263 usb_ep_autoconfig_reset(gadget);
2266 kfree(cdev->req->buf);
2268 usb_ep_free_request(gadget->ep0, cdev->req);
2273 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
2278 cdev->os_desc_req = usb_ep_alloc_request(ep0, GFP_KERNEL);
2279 if (!cdev->os_desc_req) {
2284 cdev->os_desc_req->buf = kmalloc(USB_COMP_EP0_OS_DESC_BUFSIZ,
2286 if (!cdev->os_desc_req->buf) {
2288 usb_ep_free_request(ep0, cdev->os_desc_req);
2291 cdev->os_desc_req->context = cdev;
2292 cdev->os_desc_req->complete = composite_setup_complete;
2297 void composite_dev_cleanup(struct usb_composite_dev *cdev)
2299 struct usb_gadget_string_container *uc, *tmp;
2300 struct usb_ep *ep, *tmp_ep;
2302 list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
2303 list_del(&uc->list);
2306 if (cdev->os_desc_req) {
2307 if (cdev->os_desc_pending)
2308 usb_ep_dequeue(cdev->gadget->ep0, cdev->os_desc_req);
2310 kfree(cdev->os_desc_req->buf);
2311 cdev->os_desc_req->buf = NULL;
2312 usb_ep_free_request(cdev->gadget->ep0, cdev->os_desc_req);
2313 cdev->os_desc_req = NULL;
2316 if (cdev->setup_pending)
2317 usb_ep_dequeue(cdev->gadget->ep0, cdev->req);
2319 kfree(cdev->req->buf);
2320 cdev->req->buf = NULL;
2321 usb_ep_free_request(cdev->gadget->ep0, cdev->req);
2324 cdev->next_string_id = 0;
2325 device_remove_file(&cdev->gadget->dev, &dev_attr_suspended);
2328 * Some UDC backends have a dynamic EP allocation scheme.
2330 * In that case, the dispose() callback is used to notify the
2331 * backend that the EPs are no longer in use.
2333 * Note: The UDC backend can remove the EP from the ep_list as
2334 * a result, so we need to use the _safe list iterator.
2336 list_for_each_entry_safe(ep, tmp_ep,
2337 &cdev->gadget->ep_list, ep_list) {
2338 if (ep->ops->dispose)
2339 ep->ops->dispose(ep);
2343 static int composite_bind(struct usb_gadget *gadget,
2344 struct usb_gadget_driver *gdriver)
2346 struct usb_composite_dev *cdev;
2347 struct usb_composite_driver *composite = to_cdriver(gdriver);
2348 int status = -ENOMEM;
2350 cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
2354 spin_lock_init(&cdev->lock);
2355 cdev->gadget = gadget;
2356 set_gadget_data(gadget, cdev);
2357 INIT_LIST_HEAD(&cdev->configs);
2358 INIT_LIST_HEAD(&cdev->gstrings);
2360 status = composite_dev_prepare(composite, cdev);
2364 /* composite gadget needs to assign strings for whole device (like
2365 * serial number), register function drivers, potentially update
2366 * power state and consumption, etc
2368 status = composite->bind(cdev);
2372 if (cdev->use_os_string) {
2373 status = composite_os_desc_req_prepare(cdev, gadget->ep0);
2378 update_unchanged_dev_desc(&cdev->desc, composite->dev);
2380 /* has userspace failed to provide a serial number? */
2381 if (composite->needs_serial && !cdev->desc.iSerialNumber)
2382 WARNING(cdev, "userspace failed to provide iSerialNumber\n");
2384 INFO(cdev, "%s ready\n", composite->name);
2388 __composite_unbind(gadget, false);
2392 /*-------------------------------------------------------------------------*/
2394 void composite_suspend(struct usb_gadget *gadget)
2396 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2397 struct usb_function *f;
2399 /* REVISIT: should we have config level
2400 * suspend/resume callbacks?
2402 DBG(cdev, "suspend\n");
2404 list_for_each_entry(f, &cdev->config->functions, list) {
2409 if (cdev->driver->suspend)
2410 cdev->driver->suspend(cdev);
2412 cdev->suspended = 1;
2414 usb_gadget_set_selfpowered(gadget);
2415 usb_gadget_vbus_draw(gadget, 2);
2418 void composite_resume(struct usb_gadget *gadget)
2420 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2421 struct usb_function *f;
2424 /* REVISIT: should we have config level
2425 * suspend/resume callbacks?
2427 DBG(cdev, "resume\n");
2428 if (cdev->driver->resume)
2429 cdev->driver->resume(cdev);
2431 list_for_each_entry(f, &cdev->config->functions, list) {
2436 maxpower = cdev->config->MaxPower ?
2437 cdev->config->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
2438 if (gadget->speed < USB_SPEED_SUPER)
2439 maxpower = min(maxpower, 500U);
2441 maxpower = min(maxpower, 900U);
2443 if (maxpower > USB_SELF_POWER_VBUS_MAX_DRAW)
2444 usb_gadget_clear_selfpowered(gadget);
2446 usb_gadget_vbus_draw(gadget, maxpower);
2449 cdev->suspended = 0;
2452 /*-------------------------------------------------------------------------*/
2454 static const struct usb_gadget_driver composite_driver_template = {
2455 .bind = composite_bind,
2456 .unbind = composite_unbind,
2458 .setup = composite_setup,
2459 .reset = composite_reset,
2460 .disconnect = composite_disconnect,
2462 .suspend = composite_suspend,
2463 .resume = composite_resume,
2466 .owner = THIS_MODULE,
2471 * usb_composite_probe() - register a composite driver
2472 * @driver: the driver to register
2474 * Context: single threaded during gadget setup
2476 * This function is used to register drivers using the composite driver
2477 * framework. The return value is zero, or a negative errno value.
2478 * Those values normally come from the driver's @bind method, which does
2479 * all the work of setting up the driver to match the hardware.
2481 * On successful return, the gadget is ready to respond to requests from
2482 * the host, unless one of its components invokes usb_gadget_disconnect()
2483 * while it was binding. That would usually be done in order to wait for
2484 * some userspace participation.
2486 int usb_composite_probe(struct usb_composite_driver *driver)
2488 struct usb_gadget_driver *gadget_driver;
2490 if (!driver || !driver->dev || !driver->bind)
2494 driver->name = "composite";
2496 driver->gadget_driver = composite_driver_template;
2497 gadget_driver = &driver->gadget_driver;
2499 gadget_driver->function = (char *) driver->name;
2500 gadget_driver->driver.name = driver->name;
2501 gadget_driver->max_speed = driver->max_speed;
2503 return usb_gadget_probe_driver(gadget_driver);
2505 EXPORT_SYMBOL_GPL(usb_composite_probe);
2508 * usb_composite_unregister() - unregister a composite driver
2509 * @driver: the driver to unregister
2511 * This function is used to unregister drivers using the composite
2514 void usb_composite_unregister(struct usb_composite_driver *driver)
2516 usb_gadget_unregister_driver(&driver->gadget_driver);
2518 EXPORT_SYMBOL_GPL(usb_composite_unregister);
2521 * usb_composite_setup_continue() - Continue with the control transfer
2522 * @cdev: the composite device who's control transfer was kept waiting
2524 * This function must be called by the USB function driver to continue
2525 * with the control transfer's data/status stage in case it had requested to
2526 * delay the data/status stages. A USB function's setup handler (e.g. set_alt())
2527 * can request the composite framework to delay the setup request's data/status
2528 * stages by returning USB_GADGET_DELAYED_STATUS.
2530 void usb_composite_setup_continue(struct usb_composite_dev *cdev)
2533 struct usb_request *req = cdev->req;
2534 unsigned long flags;
2536 DBG(cdev, "%s\n", __func__);
2537 spin_lock_irqsave(&cdev->lock, flags);
2539 if (cdev->delayed_status == 0) {
2540 WARN(cdev, "%s: Unexpected call\n", __func__);
2542 } else if (--cdev->delayed_status == 0) {
2543 DBG(cdev, "%s: Completing delayed status\n", __func__);
2545 req->context = cdev;
2546 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2548 DBG(cdev, "ep_queue --> %d\n", value);
2550 composite_setup_complete(cdev->gadget->ep0, req);
2554 spin_unlock_irqrestore(&cdev->lock, flags);
2556 EXPORT_SYMBOL_GPL(usb_composite_setup_continue);
2558 static char *composite_default_mfr(struct usb_gadget *gadget)
2560 return kasprintf(GFP_KERNEL, "%s %s with %s", init_utsname()->sysname,
2561 init_utsname()->release, gadget->name);
2564 void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
2565 struct usb_composite_overwrite *covr)
2567 struct usb_device_descriptor *desc = &cdev->desc;
2568 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2569 struct usb_string *dev_str = gstr->strings;
2572 desc->idVendor = cpu_to_le16(covr->idVendor);
2574 if (covr->idProduct)
2575 desc->idProduct = cpu_to_le16(covr->idProduct);
2577 if (covr->bcdDevice)
2578 desc->bcdDevice = cpu_to_le16(covr->bcdDevice);
2580 if (covr->serial_number) {
2581 desc->iSerialNumber = dev_str[USB_GADGET_SERIAL_IDX].id;
2582 dev_str[USB_GADGET_SERIAL_IDX].s = covr->serial_number;
2584 if (covr->manufacturer) {
2585 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2586 dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer;
2588 } else if (!strlen(dev_str[USB_GADGET_MANUFACTURER_IDX].s)) {
2589 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2590 cdev->def_manufacturer = composite_default_mfr(cdev->gadget);
2591 dev_str[USB_GADGET_MANUFACTURER_IDX].s = cdev->def_manufacturer;
2594 if (covr->product) {
2595 desc->iProduct = dev_str[USB_GADGET_PRODUCT_IDX].id;
2596 dev_str[USB_GADGET_PRODUCT_IDX].s = covr->product;
2599 EXPORT_SYMBOL_GPL(usb_composite_overwrite_options);
2601 MODULE_LICENSE("GPL");
2602 MODULE_AUTHOR("David Brownell");