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, *iter;
867 int result = -EINVAL;
868 unsigned power = gadget_is_otg(gadget) ? 8 : 100;
872 list_for_each_entry(iter, &cdev->configs, list) {
873 if (iter->bConfigurationValue != number)
876 * We disable the FDs of the previous
877 * configuration only if the new configuration
888 } else { /* Zero configuration value - need to reset the config */
894 DBG(cdev, "%s config #%d: %s\n",
895 usb_speed_string(gadget->speed),
896 number, c ? c->label : "unconfigured");
901 usb_gadget_set_state(gadget, USB_STATE_CONFIGURED);
904 /* Initialize all interfaces by setting them to altsetting zero. */
905 for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) {
906 struct usb_function *f = c->interface[tmp];
907 struct usb_descriptor_header **descriptors;
913 * Record which endpoints are used by the function. This is used
914 * to dispatch control requests targeted at that endpoint to the
915 * function's setup callback instead of the current
916 * configuration's setup callback.
918 descriptors = function_descriptors(f, gadget->speed);
920 for (; *descriptors; ++descriptors) {
921 struct usb_endpoint_descriptor *ep;
924 if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT)
927 ep = (struct usb_endpoint_descriptor *)*descriptors;
928 addr = ((ep->bEndpointAddress & 0x80) >> 3)
929 | (ep->bEndpointAddress & 0x0f);
930 set_bit(addr, f->endpoints);
933 result = f->set_alt(f, tmp, 0);
935 DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n",
936 tmp, f->name, f, result);
942 if (result == USB_GADGET_DELAYED_STATUS) {
944 "%s: interface %d (%s) requested delayed status\n",
945 __func__, tmp, f->name);
946 cdev->delayed_status++;
947 DBG(cdev, "delayed_status count %d\n",
948 cdev->delayed_status);
952 /* when we return, be sure our power usage is valid */
953 if (c->MaxPower || (c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))
956 power = CONFIG_USB_GADGET_VBUS_DRAW;
958 if (gadget->speed < USB_SPEED_SUPER)
959 power = min(power, 500U);
961 power = min(power, 900U);
963 if (power <= USB_SELF_POWER_VBUS_MAX_DRAW)
964 usb_gadget_set_selfpowered(gadget);
966 usb_gadget_clear_selfpowered(gadget);
968 usb_gadget_vbus_draw(gadget, power);
969 if (result >= 0 && cdev->delayed_status)
970 result = USB_GADGET_DELAYED_STATUS;
974 int usb_add_config_only(struct usb_composite_dev *cdev,
975 struct usb_configuration *config)
977 struct usb_configuration *c;
979 if (!config->bConfigurationValue)
982 /* Prevent duplicate configuration identifiers */
983 list_for_each_entry(c, &cdev->configs, list) {
984 if (c->bConfigurationValue == config->bConfigurationValue)
989 list_add_tail(&config->list, &cdev->configs);
991 INIT_LIST_HEAD(&config->functions);
992 config->next_interface_id = 0;
993 memset(config->interface, 0, sizeof(config->interface));
997 EXPORT_SYMBOL_GPL(usb_add_config_only);
1000 * usb_add_config() - add a configuration to a device.
1001 * @cdev: wraps the USB gadget
1002 * @config: the configuration, with bConfigurationValue assigned
1003 * @bind: the configuration's bind function
1004 * Context: single threaded during gadget setup
1006 * One of the main tasks of a composite @bind() routine is to
1007 * add each of the configurations it supports, using this routine.
1009 * This function returns the value of the configuration's @bind(), which
1010 * is zero for success else a negative errno value. Binding configurations
1011 * assigns global resources including string IDs, and per-configuration
1012 * resources such as interface IDs and endpoints.
1014 int usb_add_config(struct usb_composite_dev *cdev,
1015 struct usb_configuration *config,
1016 int (*bind)(struct usb_configuration *))
1018 int status = -EINVAL;
1023 DBG(cdev, "adding config #%u '%s'/%p\n",
1024 config->bConfigurationValue,
1025 config->label, config);
1027 status = usb_add_config_only(cdev, config);
1031 status = bind(config);
1033 while (!list_empty(&config->functions)) {
1034 struct usb_function *f;
1036 f = list_first_entry(&config->functions,
1037 struct usb_function, list);
1040 DBG(cdev, "unbind function '%s'/%p\n",
1042 f->unbind(config, f);
1043 /* may free memory for "f" */
1046 list_del(&config->list);
1047 config->cdev = NULL;
1051 DBG(cdev, "cfg %d/%p speeds:%s%s%s%s\n",
1052 config->bConfigurationValue, config,
1053 config->superspeed_plus ? " superplus" : "",
1054 config->superspeed ? " super" : "",
1055 config->highspeed ? " high" : "",
1057 ? (gadget_is_dualspeed(cdev->gadget)
1062 for (i = 0; i < MAX_CONFIG_INTERFACES; i++) {
1063 struct usb_function *f = config->interface[i];
1067 DBG(cdev, " interface %d = %s/%p\n",
1072 /* set_alt(), or next bind(), sets up ep->claimed as needed */
1073 usb_ep_autoconfig_reset(cdev->gadget);
1077 DBG(cdev, "added config '%s'/%u --> %d\n", config->label,
1078 config->bConfigurationValue, status);
1081 EXPORT_SYMBOL_GPL(usb_add_config);
1083 static void remove_config(struct usb_composite_dev *cdev,
1084 struct usb_configuration *config)
1086 while (!list_empty(&config->functions)) {
1087 struct usb_function *f;
1089 f = list_first_entry(&config->functions,
1090 struct usb_function, list);
1092 usb_remove_function(config, f);
1094 list_del(&config->list);
1095 if (config->unbind) {
1096 DBG(cdev, "unbind config '%s'/%p\n", config->label, config);
1097 config->unbind(config);
1098 /* may free memory for "c" */
1103 * usb_remove_config() - remove a configuration from a device.
1104 * @cdev: wraps the USB gadget
1105 * @config: the configuration
1107 * Drivers must call usb_gadget_disconnect before calling this function
1108 * to disconnect the device from the host and make sure the host will not
1109 * try to enumerate the device while we are changing the config list.
1111 void usb_remove_config(struct usb_composite_dev *cdev,
1112 struct usb_configuration *config)
1114 unsigned long flags;
1116 spin_lock_irqsave(&cdev->lock, flags);
1118 if (cdev->config == config)
1121 spin_unlock_irqrestore(&cdev->lock, flags);
1123 remove_config(cdev, config);
1126 /*-------------------------------------------------------------------------*/
1128 /* We support strings in multiple languages ... string descriptor zero
1129 * says which languages are supported. The typical case will be that
1130 * only one language (probably English) is used, with i18n handled on
1134 static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf)
1136 const struct usb_gadget_strings *s;
1142 language = cpu_to_le16(s->language);
1143 for (tmp = buf; *tmp && tmp < &buf[USB_MAX_STRING_LEN]; tmp++) {
1144 if (*tmp == language)
1153 static int lookup_string(
1154 struct usb_gadget_strings **sp,
1160 struct usb_gadget_strings *s;
1165 if (s->language != language)
1167 value = usb_gadget_get_string(s, id, buf);
1174 static int get_string(struct usb_composite_dev *cdev,
1175 void *buf, u16 language, int id)
1177 struct usb_composite_driver *composite = cdev->driver;
1178 struct usb_gadget_string_container *uc;
1179 struct usb_configuration *c;
1180 struct usb_function *f;
1183 /* Yes, not only is USB's i18n support probably more than most
1184 * folk will ever care about ... also, it's all supported here.
1185 * (Except for UTF8 support for Unicode's "Astral Planes".)
1188 /* 0 == report all available language codes */
1190 struct usb_string_descriptor *s = buf;
1191 struct usb_gadget_strings **sp;
1194 s->bDescriptorType = USB_DT_STRING;
1196 sp = composite->strings;
1198 collect_langs(sp, s->wData);
1200 list_for_each_entry(c, &cdev->configs, list) {
1203 collect_langs(sp, s->wData);
1205 list_for_each_entry(f, &c->functions, list) {
1208 collect_langs(sp, s->wData);
1211 list_for_each_entry(uc, &cdev->gstrings, list) {
1212 struct usb_gadget_strings **sp;
1214 sp = get_containers_gs(uc);
1215 collect_langs(sp, s->wData);
1218 for (len = 0; len <= USB_MAX_STRING_LEN && s->wData[len]; len++)
1223 s->bLength = 2 * (len + 1);
1227 if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) {
1228 struct usb_os_string *b = buf;
1229 b->bLength = sizeof(*b);
1230 b->bDescriptorType = USB_DT_STRING;
1232 sizeof(b->qwSignature) == sizeof(cdev->qw_sign),
1233 "qwSignature size must be equal to qw_sign");
1234 memcpy(&b->qwSignature, cdev->qw_sign, sizeof(b->qwSignature));
1235 b->bMS_VendorCode = cdev->b_vendor_code;
1240 list_for_each_entry(uc, &cdev->gstrings, list) {
1241 struct usb_gadget_strings **sp;
1243 sp = get_containers_gs(uc);
1244 len = lookup_string(sp, buf, language, id);
1249 /* String IDs are device-scoped, so we look up each string
1250 * table we're told about. These lookups are infrequent;
1251 * simpler-is-better here.
1253 if (composite->strings) {
1254 len = lookup_string(composite->strings, buf, language, id);
1258 list_for_each_entry(c, &cdev->configs, list) {
1260 len = lookup_string(c->strings, buf, language, id);
1264 list_for_each_entry(f, &c->functions, list) {
1267 len = lookup_string(f->strings, buf, language, id);
1276 * usb_string_id() - allocate an unused string ID
1277 * @cdev: the device whose string descriptor IDs are being allocated
1278 * Context: single threaded during gadget setup
1280 * @usb_string_id() is called from bind() callbacks to allocate
1281 * string IDs. Drivers for functions, configurations, or gadgets will
1282 * then store that ID in the appropriate descriptors and string table.
1284 * All string identifier should be allocated using this,
1285 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
1286 * that for example different functions don't wrongly assign different
1287 * meanings to the same identifier.
1289 int usb_string_id(struct usb_composite_dev *cdev)
1291 if (cdev->next_string_id < 254) {
1292 /* string id 0 is reserved by USB spec for list of
1293 * supported languages */
1294 /* 255 reserved as well? -- mina86 */
1295 cdev->next_string_id++;
1296 return cdev->next_string_id;
1300 EXPORT_SYMBOL_GPL(usb_string_id);
1303 * usb_string_ids_tab() - allocate unused string IDs in batch
1304 * @cdev: the device whose string descriptor IDs are being allocated
1305 * @str: an array of usb_string objects to assign numbers to
1306 * Context: single threaded during gadget setup
1308 * @usb_string_ids() is called from bind() callbacks to allocate
1309 * string IDs. Drivers for functions, configurations, or gadgets will
1310 * then copy IDs from the string table to the appropriate descriptors
1311 * and string table for other languages.
1313 * All string identifier should be allocated using this,
1314 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1315 * example different functions don't wrongly assign different meanings
1316 * to the same identifier.
1318 int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
1320 int next = cdev->next_string_id;
1322 for (; str->s; ++str) {
1323 if (unlikely(next >= 254))
1328 cdev->next_string_id = next;
1332 EXPORT_SYMBOL_GPL(usb_string_ids_tab);
1334 static struct usb_gadget_string_container *copy_gadget_strings(
1335 struct usb_gadget_strings **sp, unsigned n_gstrings,
1338 struct usb_gadget_string_container *uc;
1339 struct usb_gadget_strings **gs_array;
1340 struct usb_gadget_strings *gs;
1341 struct usb_string *s;
1348 mem += sizeof(void *) * (n_gstrings + 1);
1349 mem += sizeof(struct usb_gadget_strings) * n_gstrings;
1350 mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings);
1351 uc = kmalloc(mem, GFP_KERNEL);
1353 return ERR_PTR(-ENOMEM);
1354 gs_array = get_containers_gs(uc);
1356 stash += sizeof(void *) * (n_gstrings + 1);
1357 for (n_gs = 0; n_gs < n_gstrings; n_gs++) {
1358 struct usb_string *org_s;
1360 gs_array[n_gs] = stash;
1361 gs = gs_array[n_gs];
1362 stash += sizeof(struct usb_gadget_strings);
1363 gs->language = sp[n_gs]->language;
1364 gs->strings = stash;
1365 org_s = sp[n_gs]->strings;
1367 for (n_s = 0; n_s < n_strings; n_s++) {
1369 stash += sizeof(struct usb_string);
1378 stash += sizeof(struct usb_string);
1381 gs_array[n_gs] = NULL;
1386 * usb_gstrings_attach() - attach gadget strings to a cdev and assign ids
1387 * @cdev: the device whose string descriptor IDs are being allocated
1389 * @sp: an array of usb_gadget_strings to attach.
1390 * @n_strings: number of entries in each usb_strings array (sp[]->strings)
1392 * This function will create a deep copy of usb_gadget_strings and usb_string
1393 * and attach it to the cdev. The actual string (usb_string.s) will not be
1394 * copied but only a referenced will be made. The struct usb_gadget_strings
1395 * array may contain multiple languages and should be NULL terminated.
1396 * The ->language pointer of each struct usb_gadget_strings has to contain the
1397 * same amount of entries.
1398 * For instance: sp[0] is en-US, sp[1] is es-ES. It is expected that the first
1399 * usb_string entry of es-ES contains the translation of the first usb_string
1400 * entry of en-US. Therefore both entries become the same id assign.
1402 struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
1403 struct usb_gadget_strings **sp, unsigned n_strings)
1405 struct usb_gadget_string_container *uc;
1406 struct usb_gadget_strings **n_gs;
1407 unsigned n_gstrings = 0;
1411 for (i = 0; sp[i]; i++)
1415 return ERR_PTR(-EINVAL);
1417 uc = copy_gadget_strings(sp, n_gstrings, n_strings);
1419 return ERR_CAST(uc);
1421 n_gs = get_containers_gs(uc);
1422 ret = usb_string_ids_tab(cdev, n_gs[0]->strings);
1426 for (i = 1; i < n_gstrings; i++) {
1427 struct usb_string *m_s;
1428 struct usb_string *s;
1431 m_s = n_gs[0]->strings;
1432 s = n_gs[i]->strings;
1433 for (n = 0; n < n_strings; n++) {
1439 list_add_tail(&uc->list, &cdev->gstrings);
1440 return n_gs[0]->strings;
1443 return ERR_PTR(ret);
1445 EXPORT_SYMBOL_GPL(usb_gstrings_attach);
1448 * usb_string_ids_n() - allocate unused string IDs in batch
1449 * @c: the device whose string descriptor IDs are being allocated
1450 * @n: number of string IDs to allocate
1451 * Context: single threaded during gadget setup
1453 * Returns the first requested ID. This ID and next @n-1 IDs are now
1454 * valid IDs. At least provided that @n is non-zero because if it
1455 * is, returns last requested ID which is now very useful information.
1457 * @usb_string_ids_n() is called from bind() callbacks to allocate
1458 * string IDs. Drivers for functions, configurations, or gadgets will
1459 * then store that ID in the appropriate descriptors and string table.
1461 * All string identifier should be allocated using this,
1462 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1463 * example different functions don't wrongly assign different meanings
1464 * to the same identifier.
1466 int usb_string_ids_n(struct usb_composite_dev *c, unsigned n)
1468 unsigned next = c->next_string_id;
1469 if (unlikely(n > 254 || (unsigned)next + n > 254))
1471 c->next_string_id += n;
1474 EXPORT_SYMBOL_GPL(usb_string_ids_n);
1476 /*-------------------------------------------------------------------------*/
1478 static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
1480 struct usb_composite_dev *cdev;
1482 if (req->status || req->actual != req->length)
1483 DBG((struct usb_composite_dev *) ep->driver_data,
1484 "setup complete --> %d, %d/%d\n",
1485 req->status, req->actual, req->length);
1488 * REVIST The same ep0 requests are shared with function drivers
1489 * so they don't have to maintain the same ->complete() stubs.
1491 * Because of that, we need to check for the validity of ->context
1492 * here, even though we know we've set it to something useful.
1497 cdev = req->context;
1499 if (cdev->req == req)
1500 cdev->setup_pending = false;
1501 else if (cdev->os_desc_req == req)
1502 cdev->os_desc_pending = false;
1504 WARN(1, "unknown request %p\n", req);
1507 static int composite_ep0_queue(struct usb_composite_dev *cdev,
1508 struct usb_request *req, gfp_t gfp_flags)
1512 ret = usb_ep_queue(cdev->gadget->ep0, req, gfp_flags);
1514 if (cdev->req == req)
1515 cdev->setup_pending = true;
1516 else if (cdev->os_desc_req == req)
1517 cdev->os_desc_pending = true;
1519 WARN(1, "unknown request %p\n", req);
1525 static int count_ext_compat(struct usb_configuration *c)
1530 for (i = 0; i < c->next_interface_id; ++i) {
1531 struct usb_function *f;
1534 f = c->interface[i];
1535 for (j = 0; j < f->os_desc_n; ++j) {
1536 struct usb_os_desc *d;
1538 if (i != f->os_desc_table[j].if_id)
1540 d = f->os_desc_table[j].os_desc;
1541 if (d && d->ext_compat_id)
1549 static int fill_ext_compat(struct usb_configuration *c, u8 *buf)
1555 for (i = 0; i < c->next_interface_id; ++i) {
1556 struct usb_function *f;
1559 f = c->interface[i];
1560 for (j = 0; j < f->os_desc_n; ++j) {
1561 struct usb_os_desc *d;
1563 if (i != f->os_desc_table[j].if_id)
1565 d = f->os_desc_table[j].os_desc;
1566 if (d && d->ext_compat_id) {
1569 memcpy(buf, d->ext_compat_id, 16);
1577 if (count + 24 >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1585 static int count_ext_prop(struct usb_configuration *c, int interface)
1587 struct usb_function *f;
1590 f = c->interface[interface];
1591 for (j = 0; j < f->os_desc_n; ++j) {
1592 struct usb_os_desc *d;
1594 if (interface != f->os_desc_table[j].if_id)
1596 d = f->os_desc_table[j].os_desc;
1597 if (d && d->ext_compat_id)
1598 return d->ext_prop_count;
1603 static int len_ext_prop(struct usb_configuration *c, int interface)
1605 struct usb_function *f;
1606 struct usb_os_desc *d;
1609 res = 10; /* header length */
1610 f = c->interface[interface];
1611 for (j = 0; j < f->os_desc_n; ++j) {
1612 if (interface != f->os_desc_table[j].if_id)
1614 d = f->os_desc_table[j].os_desc;
1616 return min(res + d->ext_prop_len, 4096);
1621 static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
1623 struct usb_function *f;
1624 struct usb_os_desc *d;
1625 struct usb_os_desc_ext_prop *ext_prop;
1626 int j, count, n, ret;
1628 f = c->interface[interface];
1629 count = 10; /* header length */
1631 for (j = 0; j < f->os_desc_n; ++j) {
1632 if (interface != f->os_desc_table[j].if_id)
1634 d = f->os_desc_table[j].os_desc;
1636 list_for_each_entry(ext_prop, &d->ext_prop, entry) {
1637 n = ext_prop->data_len +
1638 ext_prop->name_len + 14;
1639 if (count + n >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1641 usb_ext_prop_put_size(buf, n);
1642 usb_ext_prop_put_type(buf, ext_prop->type);
1643 ret = usb_ext_prop_put_name(buf, ext_prop->name,
1644 ext_prop->name_len);
1647 switch (ext_prop->type) {
1648 case USB_EXT_PROP_UNICODE:
1649 case USB_EXT_PROP_UNICODE_ENV:
1650 case USB_EXT_PROP_UNICODE_LINK:
1651 usb_ext_prop_put_unicode(buf, ret,
1653 ext_prop->data_len);
1655 case USB_EXT_PROP_BINARY:
1656 usb_ext_prop_put_binary(buf, ret,
1658 ext_prop->data_len);
1660 case USB_EXT_PROP_LE32:
1661 /* not implemented */
1662 case USB_EXT_PROP_BE32:
1663 /* not implemented */
1676 * The setup() callback implements all the ep0 functionality that's
1677 * not handled lower down, in hardware or the hardware driver(like
1678 * device and endpoint feature flags, and their status). It's all
1679 * housekeeping for the gadget function we're implementing. Most of
1680 * the work is in config and function specific setup.
1683 composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1685 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1686 struct usb_request *req = cdev->req;
1687 int value = -EOPNOTSUPP;
1689 u16 w_index = le16_to_cpu(ctrl->wIndex);
1690 u8 intf = w_index & 0xFF;
1691 u16 w_value = le16_to_cpu(ctrl->wValue);
1692 u16 w_length = le16_to_cpu(ctrl->wLength);
1693 struct usb_function *f = NULL;
1694 struct usb_function *iter;
1697 if (w_length > USB_COMP_EP0_BUFSIZ) {
1698 if (ctrl->bRequestType & USB_DIR_IN) {
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;
1709 /* partial re-init of the response message; the function or the
1710 * gadget might need to intercept e.g. a control-OUT completion
1711 * when we delegate to it.
1714 req->context = cdev;
1715 req->complete = composite_setup_complete;
1717 gadget->ep0->driver_data = cdev;
1720 * Don't let non-standard requests match any of the cases below
1723 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
1726 switch (ctrl->bRequest) {
1728 /* we handle all standard USB descriptors */
1729 case USB_REQ_GET_DESCRIPTOR:
1730 if (ctrl->bRequestType != USB_DIR_IN)
1732 switch (w_value >> 8) {
1735 cdev->desc.bNumConfigurations =
1736 count_configs(cdev, USB_DT_DEVICE);
1737 cdev->desc.bMaxPacketSize0 =
1738 cdev->gadget->ep0->maxpacket;
1739 if (gadget_is_superspeed(gadget)) {
1740 if (gadget->speed >= USB_SPEED_SUPER) {
1741 cdev->desc.bcdUSB = cpu_to_le16(0x0320);
1742 cdev->desc.bMaxPacketSize0 = 9;
1744 cdev->desc.bcdUSB = cpu_to_le16(0x0210);
1747 if (gadget->lpm_capable)
1748 cdev->desc.bcdUSB = cpu_to_le16(0x0201);
1750 cdev->desc.bcdUSB = cpu_to_le16(0x0200);
1753 value = min(w_length, (u16) sizeof cdev->desc);
1754 memcpy(req->buf, &cdev->desc, value);
1756 case USB_DT_DEVICE_QUALIFIER:
1757 if (!gadget_is_dualspeed(gadget) ||
1758 gadget->speed >= USB_SPEED_SUPER)
1761 value = min_t(int, w_length,
1762 sizeof(struct usb_qualifier_descriptor));
1764 case USB_DT_OTHER_SPEED_CONFIG:
1765 if (!gadget_is_dualspeed(gadget) ||
1766 gadget->speed >= USB_SPEED_SUPER)
1770 value = config_desc(cdev, w_value);
1772 value = min(w_length, (u16) value);
1775 value = get_string(cdev, req->buf,
1776 w_index, w_value & 0xff);
1778 value = min(w_length, (u16) value);
1781 if (gadget_is_superspeed(gadget) ||
1782 gadget->lpm_capable) {
1783 value = bos_desc(cdev);
1784 value = min(w_length, (u16) value);
1788 if (gadget_is_otg(gadget)) {
1789 struct usb_configuration *config;
1790 int otg_desc_len = 0;
1793 config = cdev->config;
1795 config = list_first_entry(
1797 struct usb_configuration, list);
1801 if (gadget->otg_caps &&
1802 (gadget->otg_caps->otg_rev >= 0x0200))
1803 otg_desc_len += sizeof(
1804 struct usb_otg20_descriptor);
1806 otg_desc_len += sizeof(
1807 struct usb_otg_descriptor);
1809 value = min_t(int, w_length, otg_desc_len);
1810 memcpy(req->buf, config->descriptors[0], value);
1816 /* any number of configs can work */
1817 case USB_REQ_SET_CONFIGURATION:
1818 if (ctrl->bRequestType != 0)
1820 if (gadget_is_otg(gadget)) {
1821 if (gadget->a_hnp_support)
1822 DBG(cdev, "HNP available\n");
1823 else if (gadget->a_alt_hnp_support)
1824 DBG(cdev, "HNP on another port\n");
1826 VDBG(cdev, "HNP inactive\n");
1828 spin_lock(&cdev->lock);
1829 value = set_config(cdev, ctrl, w_value);
1830 spin_unlock(&cdev->lock);
1832 case USB_REQ_GET_CONFIGURATION:
1833 if (ctrl->bRequestType != USB_DIR_IN)
1836 *(u8 *)req->buf = cdev->config->bConfigurationValue;
1838 *(u8 *)req->buf = 0;
1839 value = min(w_length, (u16) 1);
1842 /* function drivers must handle get/set altsetting */
1843 case USB_REQ_SET_INTERFACE:
1844 if (ctrl->bRequestType != USB_RECIP_INTERFACE)
1846 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1848 f = cdev->config->interface[intf];
1853 * If there's no get_alt() method, we know only altsetting zero
1854 * works. There is no need to check if set_alt() is not NULL
1855 * as we check this in usb_add_function().
1857 if (w_value && !f->get_alt)
1860 spin_lock(&cdev->lock);
1861 value = f->set_alt(f, w_index, w_value);
1862 if (value == USB_GADGET_DELAYED_STATUS) {
1864 "%s: interface %d (%s) requested delayed status\n",
1865 __func__, intf, f->name);
1866 cdev->delayed_status++;
1867 DBG(cdev, "delayed_status count %d\n",
1868 cdev->delayed_status);
1870 spin_unlock(&cdev->lock);
1872 case USB_REQ_GET_INTERFACE:
1873 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
1875 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1877 f = cdev->config->interface[intf];
1880 /* lots of interfaces only need altsetting zero... */
1881 value = f->get_alt ? f->get_alt(f, w_index) : 0;
1884 *((u8 *)req->buf) = value;
1885 value = min(w_length, (u16) 1);
1887 case USB_REQ_GET_STATUS:
1888 if (gadget_is_otg(gadget) && gadget->hnp_polling_support &&
1889 (w_index == OTG_STS_SELECTOR)) {
1890 if (ctrl->bRequestType != (USB_DIR_IN |
1893 *((u8 *)req->buf) = gadget->host_request_flag;
1899 * USB 3.0 additions:
1900 * Function driver should handle get_status request. If such cb
1901 * wasn't supplied we respond with default value = 0
1902 * Note: function driver should supply such cb only for the
1903 * first interface of the function
1905 if (!gadget_is_superspeed(gadget))
1907 if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
1909 value = 2; /* This is the length of the get_status reply */
1910 put_unaligned_le16(0, req->buf);
1911 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1913 f = cdev->config->interface[intf];
1916 status = f->get_status ? f->get_status(f) : 0;
1919 put_unaligned_le16(status & 0x0000ffff, req->buf);
1922 * Function drivers should handle SetFeature/ClearFeature
1923 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
1924 * only for the first interface of the function
1926 case USB_REQ_CLEAR_FEATURE:
1927 case USB_REQ_SET_FEATURE:
1928 if (!gadget_is_superspeed(gadget))
1930 if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE))
1933 case USB_INTRF_FUNC_SUSPEND:
1934 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1936 f = cdev->config->interface[intf];
1940 if (f->func_suspend)
1941 value = f->func_suspend(f, w_index >> 8);
1944 "func_suspend() returned error %d\n",
1954 * OS descriptors handling
1956 if (cdev->use_os_string && cdev->os_desc_config &&
1957 (ctrl->bRequestType & USB_TYPE_VENDOR) &&
1958 ctrl->bRequest == cdev->b_vendor_code) {
1959 struct usb_configuration *os_desc_cfg;
1964 req = cdev->os_desc_req;
1965 req->context = cdev;
1966 req->complete = composite_setup_complete;
1968 os_desc_cfg = cdev->os_desc_config;
1969 w_length = min_t(u16, w_length, USB_COMP_EP0_OS_DESC_BUFSIZ);
1970 memset(buf, 0, w_length);
1972 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1973 case USB_RECIP_DEVICE:
1974 if (w_index != 0x4 || (w_value >> 8))
1977 /* Number of ext compat interfaces */
1978 count = count_ext_compat(os_desc_cfg);
1980 count *= 24; /* 24 B/ext compat desc */
1981 count += 16; /* header */
1982 put_unaligned_le32(count, buf);
1984 if (w_length > 0x10) {
1985 value = fill_ext_compat(os_desc_cfg, buf);
1986 value = min_t(u16, w_length, value);
1989 case USB_RECIP_INTERFACE:
1990 if (w_index != 0x5 || (w_value >> 8))
1992 interface = w_value & 0xFF;
1993 if (interface >= MAX_CONFIG_INTERFACES ||
1994 !os_desc_cfg->interface[interface])
1997 count = count_ext_prop(os_desc_cfg,
1999 put_unaligned_le16(count, buf + 8);
2000 count = len_ext_prop(os_desc_cfg,
2002 put_unaligned_le32(count, buf);
2004 if (w_length > 0x0A) {
2005 value = fill_ext_prop(os_desc_cfg,
2008 value = min_t(u16, w_length, value);
2017 "non-core control req%02x.%02x v%04x i%04x l%d\n",
2018 ctrl->bRequestType, ctrl->bRequest,
2019 w_value, w_index, w_length);
2021 /* functions always handle their interfaces and endpoints...
2022 * punt other recipients (other, WUSB, ...) to the current
2023 * configuration code.
2026 list_for_each_entry(f, &cdev->config->functions, list)
2028 f->req_match(f, ctrl, false))
2031 struct usb_configuration *c;
2032 list_for_each_entry(c, &cdev->configs, list)
2033 list_for_each_entry(f, &c->functions, list)
2035 f->req_match(f, ctrl, true))
2040 switch (ctrl->bRequestType & USB_RECIP_MASK) {
2041 case USB_RECIP_INTERFACE:
2042 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
2044 f = cdev->config->interface[intf];
2047 case USB_RECIP_ENDPOINT:
2050 endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f);
2051 list_for_each_entry(iter, &cdev->config->functions, list) {
2052 if (test_bit(endp, iter->endpoints)) {
2061 value = f->setup(f, ctrl);
2063 struct usb_configuration *c;
2069 /* try current config's setup */
2071 value = c->setup(c, ctrl);
2075 /* try the only function in the current config */
2076 if (!list_is_singular(&c->functions))
2078 f = list_first_entry(&c->functions, struct usb_function,
2081 value = f->setup(f, ctrl);
2088 /* respond with data transfer before status phase? */
2089 if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) {
2090 req->length = value;
2091 req->context = cdev;
2092 req->zero = value < w_length;
2093 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2095 DBG(cdev, "ep_queue --> %d\n", value);
2097 composite_setup_complete(gadget->ep0, req);
2099 } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) {
2101 "%s: Delayed status not supported for w_length != 0",
2106 /* device either stalls (value < 0) or reports success */
2110 static void __composite_disconnect(struct usb_gadget *gadget)
2112 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2113 unsigned long flags;
2115 /* REVISIT: should we have config and device level
2116 * disconnect callbacks?
2118 spin_lock_irqsave(&cdev->lock, flags);
2119 cdev->suspended = 0;
2122 if (cdev->driver->disconnect)
2123 cdev->driver->disconnect(cdev);
2124 spin_unlock_irqrestore(&cdev->lock, flags);
2127 void composite_disconnect(struct usb_gadget *gadget)
2129 usb_gadget_vbus_draw(gadget, 0);
2130 __composite_disconnect(gadget);
2133 void composite_reset(struct usb_gadget *gadget)
2136 * Section 1.4.13 Standard Downstream Port of the USB battery charging
2137 * specification v1.2 states that a device connected on a SDP shall only
2138 * draw at max 100mA while in a connected, but unconfigured state.
2140 usb_gadget_vbus_draw(gadget, 100);
2141 __composite_disconnect(gadget);
2144 /*-------------------------------------------------------------------------*/
2146 static ssize_t suspended_show(struct device *dev, struct device_attribute *attr,
2149 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
2150 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2152 return sprintf(buf, "%d\n", cdev->suspended);
2154 static DEVICE_ATTR_RO(suspended);
2156 static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
2158 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2159 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2160 struct usb_string *dev_str = gstr->strings;
2162 /* composite_disconnect() must already have been called
2163 * by the underlying peripheral controller driver!
2164 * so there's no i/o concurrency that could affect the
2165 * state protected by cdev->lock.
2167 WARN_ON(cdev->config);
2169 while (!list_empty(&cdev->configs)) {
2170 struct usb_configuration *c;
2171 c = list_first_entry(&cdev->configs,
2172 struct usb_configuration, list);
2173 remove_config(cdev, c);
2175 if (cdev->driver->unbind && unbind_driver)
2176 cdev->driver->unbind(cdev);
2178 composite_dev_cleanup(cdev);
2180 if (dev_str[USB_GADGET_MANUFACTURER_IDX].s == cdev->def_manufacturer)
2181 dev_str[USB_GADGET_MANUFACTURER_IDX].s = "";
2183 kfree(cdev->def_manufacturer);
2185 set_gadget_data(gadget, NULL);
2188 static void composite_unbind(struct usb_gadget *gadget)
2190 __composite_unbind(gadget, true);
2193 static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
2194 const struct usb_device_descriptor *old)
2204 * these variables may have been set in
2205 * usb_composite_overwrite_options()
2207 idVendor = new->idVendor;
2208 idProduct = new->idProduct;
2209 bcdDevice = new->bcdDevice;
2210 iSerialNumber = new->iSerialNumber;
2211 iManufacturer = new->iManufacturer;
2212 iProduct = new->iProduct;
2216 new->idVendor = idVendor;
2218 new->idProduct = idProduct;
2220 new->bcdDevice = bcdDevice;
2222 new->bcdDevice = cpu_to_le16(get_default_bcdDevice());
2224 new->iSerialNumber = iSerialNumber;
2226 new->iManufacturer = iManufacturer;
2228 new->iProduct = iProduct;
2231 int composite_dev_prepare(struct usb_composite_driver *composite,
2232 struct usb_composite_dev *cdev)
2234 struct usb_gadget *gadget = cdev->gadget;
2237 /* preallocate control response and buffer */
2238 cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
2242 cdev->req->buf = kzalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
2243 if (!cdev->req->buf)
2246 ret = device_create_file(&gadget->dev, &dev_attr_suspended);
2250 cdev->req->complete = composite_setup_complete;
2251 cdev->req->context = cdev;
2252 gadget->ep0->driver_data = cdev;
2254 cdev->driver = composite;
2257 * As per USB compliance update, a device that is actively drawing
2258 * more than 100mA from USB must report itself as bus-powered in
2259 * the GetStatus(DEVICE) call.
2261 if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW)
2262 usb_gadget_set_selfpowered(gadget);
2264 /* interface and string IDs start at zero via kzalloc.
2265 * we force endpoints to start unassigned; few controller
2266 * drivers will zero ep->driver_data.
2268 usb_ep_autoconfig_reset(gadget);
2271 kfree(cdev->req->buf);
2273 usb_ep_free_request(gadget->ep0, cdev->req);
2278 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
2283 cdev->os_desc_req = usb_ep_alloc_request(ep0, GFP_KERNEL);
2284 if (!cdev->os_desc_req) {
2289 cdev->os_desc_req->buf = kmalloc(USB_COMP_EP0_OS_DESC_BUFSIZ,
2291 if (!cdev->os_desc_req->buf) {
2293 usb_ep_free_request(ep0, cdev->os_desc_req);
2296 cdev->os_desc_req->context = cdev;
2297 cdev->os_desc_req->complete = composite_setup_complete;
2302 void composite_dev_cleanup(struct usb_composite_dev *cdev)
2304 struct usb_gadget_string_container *uc, *tmp;
2305 struct usb_ep *ep, *tmp_ep;
2307 list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
2308 list_del(&uc->list);
2311 if (cdev->os_desc_req) {
2312 if (cdev->os_desc_pending)
2313 usb_ep_dequeue(cdev->gadget->ep0, cdev->os_desc_req);
2315 kfree(cdev->os_desc_req->buf);
2316 cdev->os_desc_req->buf = NULL;
2317 usb_ep_free_request(cdev->gadget->ep0, cdev->os_desc_req);
2318 cdev->os_desc_req = NULL;
2321 if (cdev->setup_pending)
2322 usb_ep_dequeue(cdev->gadget->ep0, cdev->req);
2324 kfree(cdev->req->buf);
2325 cdev->req->buf = NULL;
2326 usb_ep_free_request(cdev->gadget->ep0, cdev->req);
2329 cdev->next_string_id = 0;
2330 device_remove_file(&cdev->gadget->dev, &dev_attr_suspended);
2333 * Some UDC backends have a dynamic EP allocation scheme.
2335 * In that case, the dispose() callback is used to notify the
2336 * backend that the EPs are no longer in use.
2338 * Note: The UDC backend can remove the EP from the ep_list as
2339 * a result, so we need to use the _safe list iterator.
2341 list_for_each_entry_safe(ep, tmp_ep,
2342 &cdev->gadget->ep_list, ep_list) {
2343 if (ep->ops->dispose)
2344 ep->ops->dispose(ep);
2348 static int composite_bind(struct usb_gadget *gadget,
2349 struct usb_gadget_driver *gdriver)
2351 struct usb_composite_dev *cdev;
2352 struct usb_composite_driver *composite = to_cdriver(gdriver);
2353 int status = -ENOMEM;
2355 cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
2359 spin_lock_init(&cdev->lock);
2360 cdev->gadget = gadget;
2361 set_gadget_data(gadget, cdev);
2362 INIT_LIST_HEAD(&cdev->configs);
2363 INIT_LIST_HEAD(&cdev->gstrings);
2365 status = composite_dev_prepare(composite, cdev);
2369 /* composite gadget needs to assign strings for whole device (like
2370 * serial number), register function drivers, potentially update
2371 * power state and consumption, etc
2373 status = composite->bind(cdev);
2377 if (cdev->use_os_string) {
2378 status = composite_os_desc_req_prepare(cdev, gadget->ep0);
2383 update_unchanged_dev_desc(&cdev->desc, composite->dev);
2385 /* has userspace failed to provide a serial number? */
2386 if (composite->needs_serial && !cdev->desc.iSerialNumber)
2387 WARNING(cdev, "userspace failed to provide iSerialNumber\n");
2389 INFO(cdev, "%s ready\n", composite->name);
2393 __composite_unbind(gadget, false);
2397 /*-------------------------------------------------------------------------*/
2399 void composite_suspend(struct usb_gadget *gadget)
2401 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2402 struct usb_function *f;
2404 /* REVISIT: should we have config level
2405 * suspend/resume callbacks?
2407 DBG(cdev, "suspend\n");
2409 list_for_each_entry(f, &cdev->config->functions, list) {
2414 if (cdev->driver->suspend)
2415 cdev->driver->suspend(cdev);
2417 cdev->suspended = 1;
2419 usb_gadget_set_selfpowered(gadget);
2420 usb_gadget_vbus_draw(gadget, 2);
2423 void composite_resume(struct usb_gadget *gadget)
2425 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2426 struct usb_function *f;
2429 /* REVISIT: should we have config level
2430 * suspend/resume callbacks?
2432 DBG(cdev, "resume\n");
2433 if (cdev->driver->resume)
2434 cdev->driver->resume(cdev);
2436 list_for_each_entry(f, &cdev->config->functions, list) {
2441 maxpower = cdev->config->MaxPower ?
2442 cdev->config->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
2443 if (gadget->speed < USB_SPEED_SUPER)
2444 maxpower = min(maxpower, 500U);
2446 maxpower = min(maxpower, 900U);
2448 if (maxpower > USB_SELF_POWER_VBUS_MAX_DRAW)
2449 usb_gadget_clear_selfpowered(gadget);
2451 usb_gadget_vbus_draw(gadget, maxpower);
2454 cdev->suspended = 0;
2457 /*-------------------------------------------------------------------------*/
2459 static const struct usb_gadget_driver composite_driver_template = {
2460 .bind = composite_bind,
2461 .unbind = composite_unbind,
2463 .setup = composite_setup,
2464 .reset = composite_reset,
2465 .disconnect = composite_disconnect,
2467 .suspend = composite_suspend,
2468 .resume = composite_resume,
2471 .owner = THIS_MODULE,
2476 * usb_composite_probe() - register a composite driver
2477 * @driver: the driver to register
2479 * Context: single threaded during gadget setup
2481 * This function is used to register drivers using the composite driver
2482 * framework. The return value is zero, or a negative errno value.
2483 * Those values normally come from the driver's @bind method, which does
2484 * all the work of setting up the driver to match the hardware.
2486 * On successful return, the gadget is ready to respond to requests from
2487 * the host, unless one of its components invokes usb_gadget_disconnect()
2488 * while it was binding. That would usually be done in order to wait for
2489 * some userspace participation.
2491 int usb_composite_probe(struct usb_composite_driver *driver)
2493 struct usb_gadget_driver *gadget_driver;
2495 if (!driver || !driver->dev || !driver->bind)
2499 driver->name = "composite";
2501 driver->gadget_driver = composite_driver_template;
2502 gadget_driver = &driver->gadget_driver;
2504 gadget_driver->function = (char *) driver->name;
2505 gadget_driver->driver.name = driver->name;
2506 gadget_driver->max_speed = driver->max_speed;
2508 return usb_gadget_register_driver(gadget_driver);
2510 EXPORT_SYMBOL_GPL(usb_composite_probe);
2513 * usb_composite_unregister() - unregister a composite driver
2514 * @driver: the driver to unregister
2516 * This function is used to unregister drivers using the composite
2519 void usb_composite_unregister(struct usb_composite_driver *driver)
2521 usb_gadget_unregister_driver(&driver->gadget_driver);
2523 EXPORT_SYMBOL_GPL(usb_composite_unregister);
2526 * usb_composite_setup_continue() - Continue with the control transfer
2527 * @cdev: the composite device who's control transfer was kept waiting
2529 * This function must be called by the USB function driver to continue
2530 * with the control transfer's data/status stage in case it had requested to
2531 * delay the data/status stages. A USB function's setup handler (e.g. set_alt())
2532 * can request the composite framework to delay the setup request's data/status
2533 * stages by returning USB_GADGET_DELAYED_STATUS.
2535 void usb_composite_setup_continue(struct usb_composite_dev *cdev)
2538 struct usb_request *req = cdev->req;
2539 unsigned long flags;
2541 DBG(cdev, "%s\n", __func__);
2542 spin_lock_irqsave(&cdev->lock, flags);
2544 if (cdev->delayed_status == 0) {
2545 WARN(cdev, "%s: Unexpected call\n", __func__);
2547 } else if (--cdev->delayed_status == 0) {
2548 DBG(cdev, "%s: Completing delayed status\n", __func__);
2550 req->context = cdev;
2551 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2553 DBG(cdev, "ep_queue --> %d\n", value);
2555 composite_setup_complete(cdev->gadget->ep0, req);
2559 spin_unlock_irqrestore(&cdev->lock, flags);
2561 EXPORT_SYMBOL_GPL(usb_composite_setup_continue);
2563 static char *composite_default_mfr(struct usb_gadget *gadget)
2565 return kasprintf(GFP_KERNEL, "%s %s with %s", init_utsname()->sysname,
2566 init_utsname()->release, gadget->name);
2569 void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
2570 struct usb_composite_overwrite *covr)
2572 struct usb_device_descriptor *desc = &cdev->desc;
2573 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2574 struct usb_string *dev_str = gstr->strings;
2577 desc->idVendor = cpu_to_le16(covr->idVendor);
2579 if (covr->idProduct)
2580 desc->idProduct = cpu_to_le16(covr->idProduct);
2582 if (covr->bcdDevice)
2583 desc->bcdDevice = cpu_to_le16(covr->bcdDevice);
2585 if (covr->serial_number) {
2586 desc->iSerialNumber = dev_str[USB_GADGET_SERIAL_IDX].id;
2587 dev_str[USB_GADGET_SERIAL_IDX].s = covr->serial_number;
2589 if (covr->manufacturer) {
2590 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2591 dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer;
2593 } else if (!strlen(dev_str[USB_GADGET_MANUFACTURER_IDX].s)) {
2594 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2595 cdev->def_manufacturer = composite_default_mfr(cdev->gadget);
2596 dev_str[USB_GADGET_MANUFACTURER_IDX].s = cdev->def_manufacturer;
2599 if (covr->product) {
2600 desc->iProduct = dev_str[USB_GADGET_PRODUCT_IDX].id;
2601 dev_str[USB_GADGET_PRODUCT_IDX].s = covr->product;
2604 EXPORT_SYMBOL_GPL(usb_composite_overwrite_options);
2606 MODULE_LICENSE("GPL");
2607 MODULE_AUTHOR("David Brownell");