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>
17 #include <linux/usb/composite.h>
18 #include <linux/usb/otg.h>
19 #include <asm/unaligned.h>
21 #include "u_os_desc.h"
24 * struct usb_os_string - represents OS String to be reported by a gadget
25 * @bLength: total length of the entire descritor, always 0x12
26 * @bDescriptorType: USB_DT_STRING
27 * @qwSignature: the OS String proper
28 * @bMS_VendorCode: code used by the host for subsequent requests
29 * @bPad: not used, must be zero
31 struct usb_os_string {
34 __u8 qwSignature[OS_STRING_QW_SIGN_LEN];
40 * The code in this file is utility code, used to build a gadget driver
41 * from one or more "function" drivers, one or more "configuration"
42 * objects, and a "usb_composite_driver" by gluing them together along
43 * with the relevant device-wide data.
46 static struct usb_gadget_strings **get_containers_gs(
47 struct usb_gadget_string_container *uc)
49 return (struct usb_gadget_strings **)uc->stash;
53 * function_descriptors() - get function descriptors for speed
57 * Returns the descriptors or NULL if not set.
59 static struct usb_descriptor_header **
60 function_descriptors(struct usb_function *f,
61 enum usb_device_speed speed)
63 struct usb_descriptor_header **descriptors;
66 * NOTE: we try to help gadget drivers which might not be setting
67 * max_speed appropriately.
71 case USB_SPEED_SUPER_PLUS:
72 descriptors = f->ssp_descriptors;
77 descriptors = f->ss_descriptors;
82 descriptors = f->hs_descriptors;
87 descriptors = f->fs_descriptors;
91 * if we can't find any descriptors at all, then this gadget deserves to
92 * Oops with a NULL pointer dereference
99 * next_ep_desc() - advance to the next EP descriptor
100 * @t: currect pointer within descriptor array
102 * Return: next EP descriptor or NULL
104 * Iterate over @t until either EP descriptor found or
105 * NULL (that indicates end of list) encountered
107 static struct usb_descriptor_header**
108 next_ep_desc(struct usb_descriptor_header **t)
111 if ((*t)->bDescriptorType == USB_DT_ENDPOINT)
118 * for_each_ep_desc()- iterate over endpoint descriptors in the
120 * @start: pointer within descriptor array.
121 * @ep_desc: endpoint descriptor to use as the loop cursor
123 #define for_each_ep_desc(start, ep_desc) \
124 for (ep_desc = next_ep_desc(start); \
125 ep_desc; ep_desc = next_ep_desc(ep_desc+1))
128 * config_ep_by_speed() - configures the given endpoint
129 * according to gadget speed.
130 * @g: pointer to the gadget
132 * @_ep: the endpoint to configure
134 * Return: error code, 0 on success
136 * This function chooses the right descriptors for a given
137 * endpoint according to gadget speed and saves it in the
138 * endpoint desc field. If the endpoint already has a descriptor
139 * assigned to it - overwrites it with currently corresponding
140 * descriptor. The endpoint maxpacket field is updated according
141 * to the chosen descriptor.
142 * Note: the supplied function should hold all the descriptors
143 * for supported speeds
145 int config_ep_by_speed(struct usb_gadget *g,
146 struct usb_function *f,
149 struct usb_endpoint_descriptor *chosen_desc = NULL;
150 struct usb_descriptor_header **speed_desc = NULL;
152 struct usb_ss_ep_comp_descriptor *comp_desc = NULL;
153 int want_comp_desc = 0;
155 struct usb_descriptor_header **d_spd; /* cursor for speed desc */
157 if (!g || !f || !_ep)
160 /* select desired speed */
162 case USB_SPEED_SUPER_PLUS:
163 if (gadget_is_superspeed_plus(g)) {
164 speed_desc = f->ssp_descriptors;
169 case USB_SPEED_SUPER:
170 if (gadget_is_superspeed(g)) {
171 speed_desc = f->ss_descriptors;
177 if (gadget_is_dualspeed(g)) {
178 speed_desc = f->hs_descriptors;
183 speed_desc = f->fs_descriptors;
185 /* find descriptors */
186 for_each_ep_desc(speed_desc, d_spd) {
187 chosen_desc = (struct usb_endpoint_descriptor *)*d_spd;
188 if (chosen_desc->bEndpointAddress == _ep->address)
195 _ep->maxpacket = usb_endpoint_maxp(chosen_desc);
196 _ep->desc = chosen_desc;
197 _ep->comp_desc = NULL;
201 if (g->speed == USB_SPEED_HIGH && (usb_endpoint_xfer_isoc(_ep->desc) ||
202 usb_endpoint_xfer_int(_ep->desc)))
203 _ep->mult = usb_endpoint_maxp_mult(_ep->desc);
209 * Companion descriptor should follow EP descriptor
210 * USB 3.0 spec, #9.6.7
212 comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd);
214 (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP))
216 _ep->comp_desc = comp_desc;
217 if (g->speed >= USB_SPEED_SUPER) {
218 switch (usb_endpoint_type(_ep->desc)) {
219 case USB_ENDPOINT_XFER_ISOC:
220 /* mult: bits 1:0 of bmAttributes */
221 _ep->mult = (comp_desc->bmAttributes & 0x3) + 1;
223 case USB_ENDPOINT_XFER_BULK:
224 case USB_ENDPOINT_XFER_INT:
225 _ep->maxburst = comp_desc->bMaxBurst + 1;
228 if (comp_desc->bMaxBurst != 0) {
229 struct usb_composite_dev *cdev;
231 cdev = get_gadget_data(g);
232 ERROR(cdev, "ep0 bMaxBurst must be 0\n");
240 EXPORT_SYMBOL_GPL(config_ep_by_speed);
243 * usb_add_function() - add a function to a configuration
244 * @config: the configuration
245 * @function: the function being added
246 * Context: single threaded during gadget setup
248 * After initialization, each configuration must have one or more
249 * functions added to it. Adding a function involves calling its @bind()
250 * method to allocate resources such as interface and string identifiers
253 * This function returns the value of the function's bind(), which is
254 * zero for success else a negative errno value.
256 int usb_add_function(struct usb_configuration *config,
257 struct usb_function *function)
261 DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n",
262 function->name, function,
263 config->label, config);
265 if (!function->set_alt || !function->disable)
268 function->config = config;
269 list_add_tail(&function->list, &config->functions);
271 if (function->bind_deactivated) {
272 value = usb_function_deactivate(function);
277 /* REVISIT *require* function->bind? */
278 if (function->bind) {
279 value = function->bind(config, function);
281 list_del(&function->list);
282 function->config = NULL;
287 /* We allow configurations that don't work at both speeds.
288 * If we run into a lowspeed Linux system, treat it the same
289 * as full speed ... it's the function drivers that will need
290 * to avoid bulk and ISO transfers.
292 if (!config->fullspeed && function->fs_descriptors)
293 config->fullspeed = true;
294 if (!config->highspeed && function->hs_descriptors)
295 config->highspeed = true;
296 if (!config->superspeed && function->ss_descriptors)
297 config->superspeed = true;
298 if (!config->superspeed_plus && function->ssp_descriptors)
299 config->superspeed_plus = true;
303 DBG(config->cdev, "adding '%s'/%p --> %d\n",
304 function->name, function, value);
307 EXPORT_SYMBOL_GPL(usb_add_function);
309 void usb_remove_function(struct usb_configuration *c, struct usb_function *f)
314 bitmap_zero(f->endpoints, 32);
319 if (f->bind_deactivated)
320 usb_function_activate(f);
322 EXPORT_SYMBOL_GPL(usb_remove_function);
325 * usb_function_deactivate - prevent function and gadget enumeration
326 * @function: the function that isn't yet ready to respond
328 * Blocks response of the gadget driver to host enumeration by
329 * preventing the data line pullup from being activated. This is
330 * normally called during @bind() processing to change from the
331 * initial "ready to respond" state, or when a required resource
334 * For example, drivers that serve as a passthrough to a userspace
335 * daemon can block enumeration unless that daemon (such as an OBEX,
336 * MTP, or print server) is ready to handle host requests.
338 * Not all systems support software control of their USB peripheral
341 * Returns zero on success, else negative errno.
343 int usb_function_deactivate(struct usb_function *function)
345 struct usb_composite_dev *cdev = function->config->cdev;
349 spin_lock_irqsave(&cdev->lock, flags);
351 if (cdev->deactivations == 0)
352 status = usb_gadget_deactivate(cdev->gadget);
354 cdev->deactivations++;
356 spin_unlock_irqrestore(&cdev->lock, flags);
359 EXPORT_SYMBOL_GPL(usb_function_deactivate);
362 * usb_function_activate - allow function and gadget enumeration
363 * @function: function on which usb_function_activate() was called
365 * Reverses effect of usb_function_deactivate(). If no more functions
366 * are delaying their activation, the gadget driver will respond to
367 * host enumeration procedures.
369 * Returns zero on success, else negative errno.
371 int usb_function_activate(struct usb_function *function)
373 struct usb_composite_dev *cdev = function->config->cdev;
377 spin_lock_irqsave(&cdev->lock, flags);
379 if (WARN_ON(cdev->deactivations == 0))
382 cdev->deactivations--;
383 if (cdev->deactivations == 0)
384 status = usb_gadget_activate(cdev->gadget);
387 spin_unlock_irqrestore(&cdev->lock, flags);
390 EXPORT_SYMBOL_GPL(usb_function_activate);
393 * usb_interface_id() - allocate an unused interface ID
394 * @config: configuration associated with the interface
395 * @function: function handling the interface
396 * Context: single threaded during gadget setup
398 * usb_interface_id() is called from usb_function.bind() callbacks to
399 * allocate new interface IDs. The function driver will then store that
400 * ID in interface, association, CDC union, and other descriptors. It
401 * will also handle any control requests targeted at that interface,
402 * particularly changing its altsetting via set_alt(). There may
403 * also be class-specific or vendor-specific requests to handle.
405 * All interface identifier should be allocated using this routine, to
406 * ensure that for example different functions don't wrongly assign
407 * different meanings to the same identifier. Note that since interface
408 * identifiers are configuration-specific, functions used in more than
409 * one configuration (or more than once in a given configuration) need
410 * multiple versions of the relevant descriptors.
412 * Returns the interface ID which was allocated; or -ENODEV if no
413 * more interface IDs can be allocated.
415 int usb_interface_id(struct usb_configuration *config,
416 struct usb_function *function)
418 unsigned id = config->next_interface_id;
420 if (id < MAX_CONFIG_INTERFACES) {
421 config->interface[id] = function;
422 config->next_interface_id = id + 1;
427 EXPORT_SYMBOL_GPL(usb_interface_id);
429 static u8 encode_bMaxPower(enum usb_device_speed speed,
430 struct usb_configuration *c)
437 val = CONFIG_USB_GADGET_VBUS_DRAW;
440 if (speed < USB_SPEED_SUPER)
441 return min(val, 500U) / 2;
444 * USB 3.x supports up to 900mA, but since 900 isn't divisible
445 * by 8 the integral division will effectively cap to 896mA.
447 return min(val, 900U) / 8;
450 static int config_buf(struct usb_configuration *config,
451 enum usb_device_speed speed, void *buf, u8 type)
453 struct usb_config_descriptor *c = buf;
454 void *next = buf + USB_DT_CONFIG_SIZE;
456 struct usb_function *f;
459 len = USB_COMP_EP0_BUFSIZ - USB_DT_CONFIG_SIZE;
460 /* write the config descriptor */
462 c->bLength = USB_DT_CONFIG_SIZE;
463 c->bDescriptorType = type;
464 /* wTotalLength is written later */
465 c->bNumInterfaces = config->next_interface_id;
466 c->bConfigurationValue = config->bConfigurationValue;
467 c->iConfiguration = config->iConfiguration;
468 c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes;
469 c->bMaxPower = encode_bMaxPower(speed, config);
471 /* There may be e.g. OTG descriptors */
472 if (config->descriptors) {
473 status = usb_descriptor_fillbuf(next, len,
474 config->descriptors);
481 /* add each function's descriptors */
482 list_for_each_entry(f, &config->functions, list) {
483 struct usb_descriptor_header **descriptors;
485 descriptors = function_descriptors(f, speed);
488 status = usb_descriptor_fillbuf(next, len,
489 (const struct usb_descriptor_header **) descriptors);
497 c->wTotalLength = cpu_to_le16(len);
501 static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
503 struct usb_gadget *gadget = cdev->gadget;
504 struct usb_configuration *c;
505 struct list_head *pos;
506 u8 type = w_value >> 8;
507 enum usb_device_speed speed = USB_SPEED_UNKNOWN;
509 if (gadget->speed >= USB_SPEED_SUPER)
510 speed = gadget->speed;
511 else if (gadget_is_dualspeed(gadget)) {
513 if (gadget->speed == USB_SPEED_HIGH)
515 if (type == USB_DT_OTHER_SPEED_CONFIG)
518 speed = USB_SPEED_HIGH;
522 /* This is a lookup by config *INDEX* */
525 pos = &cdev->configs;
526 c = cdev->os_desc_config;
530 while ((pos = pos->next) != &cdev->configs) {
531 c = list_entry(pos, typeof(*c), list);
533 /* skip OS Descriptors config which is handled separately */
534 if (c == cdev->os_desc_config)
538 /* ignore configs that won't work at this speed */
540 case USB_SPEED_SUPER_PLUS:
541 if (!c->superspeed_plus)
544 case USB_SPEED_SUPER:
558 return config_buf(c, speed, cdev->req->buf, type);
564 static int count_configs(struct usb_composite_dev *cdev, unsigned type)
566 struct usb_gadget *gadget = cdev->gadget;
567 struct usb_configuration *c;
573 if (gadget_is_dualspeed(gadget)) {
574 if (gadget->speed == USB_SPEED_HIGH)
576 if (gadget->speed == USB_SPEED_SUPER)
578 if (gadget->speed == USB_SPEED_SUPER_PLUS)
580 if (type == USB_DT_DEVICE_QUALIFIER)
583 list_for_each_entry(c, &cdev->configs, list) {
584 /* ignore configs that won't work at this speed */
586 if (!c->superspeed_plus)
604 * bos_desc() - prepares the BOS descriptor.
605 * @cdev: pointer to usb_composite device to generate the bos
608 * This function generates the BOS (Binary Device Object)
609 * descriptor and its device capabilities descriptors. The BOS
610 * descriptor should be supported by a SuperSpeed device.
612 static int bos_desc(struct usb_composite_dev *cdev)
614 struct usb_ext_cap_descriptor *usb_ext;
615 struct usb_dcd_config_params dcd_config_params;
616 struct usb_bos_descriptor *bos = cdev->req->buf;
617 unsigned int besl = 0;
619 bos->bLength = USB_DT_BOS_SIZE;
620 bos->bDescriptorType = USB_DT_BOS;
622 bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
623 bos->bNumDeviceCaps = 0;
625 /* Get Controller configuration */
626 if (cdev->gadget->ops->get_config_params) {
627 cdev->gadget->ops->get_config_params(cdev->gadget,
630 dcd_config_params.besl_baseline =
631 USB_DEFAULT_BESL_UNSPECIFIED;
632 dcd_config_params.besl_deep =
633 USB_DEFAULT_BESL_UNSPECIFIED;
634 dcd_config_params.bU1devExitLat =
635 USB_DEFAULT_U1_DEV_EXIT_LAT;
636 dcd_config_params.bU2DevExitLat =
637 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
640 if (dcd_config_params.besl_baseline != USB_DEFAULT_BESL_UNSPECIFIED)
641 besl = USB_BESL_BASELINE_VALID |
642 USB_SET_BESL_BASELINE(dcd_config_params.besl_baseline);
644 if (dcd_config_params.besl_deep != USB_DEFAULT_BESL_UNSPECIFIED)
645 besl |= USB_BESL_DEEP_VALID |
646 USB_SET_BESL_DEEP(dcd_config_params.besl_deep);
649 * A SuperSpeed device shall include the USB2.0 extension descriptor
650 * and shall support LPM when operating in USB2.0 HS mode.
652 usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
653 bos->bNumDeviceCaps++;
654 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
655 usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
656 usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
657 usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
658 usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT |
659 USB_BESL_SUPPORT | besl);
662 * The Superspeed USB Capability descriptor shall be implemented by all
663 * SuperSpeed devices.
665 if (gadget_is_superspeed(cdev->gadget)) {
666 struct usb_ss_cap_descriptor *ss_cap;
668 ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
669 bos->bNumDeviceCaps++;
670 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
671 ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
672 ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
673 ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
674 ss_cap->bmAttributes = 0; /* LTM is not supported yet */
675 ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
676 USB_FULL_SPEED_OPERATION |
677 USB_HIGH_SPEED_OPERATION |
678 USB_5GBPS_OPERATION);
679 ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
680 ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
681 ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
684 /* The SuperSpeedPlus USB Device Capability descriptor */
685 if (gadget_is_superspeed_plus(cdev->gadget)) {
686 struct usb_ssp_cap_descriptor *ssp_cap;
688 ssp_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
689 bos->bNumDeviceCaps++;
692 * Report typical values.
695 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SSP_CAP_SIZE(1));
696 ssp_cap->bLength = USB_DT_USB_SSP_CAP_SIZE(1);
697 ssp_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
698 ssp_cap->bDevCapabilityType = USB_SSP_CAP_TYPE;
699 ssp_cap->bReserved = 0;
700 ssp_cap->wReserved = 0;
702 /* SSAC = 1 (2 attributes) */
703 ssp_cap->bmAttributes = cpu_to_le32(1);
705 /* Min RX/TX Lane Count = 1 */
706 ssp_cap->wFunctionalitySupport =
707 cpu_to_le16((1 << 8) | (1 << 12));
710 * bmSublinkSpeedAttr[0]:
713 * LP = 1 (SuperSpeedPlus)
716 ssp_cap->bmSublinkSpeedAttr[0] =
717 cpu_to_le32((3 << 4) | (1 << 14) | (0xa << 16));
719 * bmSublinkSpeedAttr[1] =
722 * LP = 1 (SuperSpeedPlus)
725 ssp_cap->bmSublinkSpeedAttr[1] =
726 cpu_to_le32((3 << 4) | (1 << 14) |
727 (0xa << 16) | (1 << 7));
730 return le16_to_cpu(bos->wTotalLength);
733 static void device_qual(struct usb_composite_dev *cdev)
735 struct usb_qualifier_descriptor *qual = cdev->req->buf;
737 qual->bLength = sizeof(*qual);
738 qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
739 /* POLICY: same bcdUSB and device type info at both speeds */
740 qual->bcdUSB = cdev->desc.bcdUSB;
741 qual->bDeviceClass = cdev->desc.bDeviceClass;
742 qual->bDeviceSubClass = cdev->desc.bDeviceSubClass;
743 qual->bDeviceProtocol = cdev->desc.bDeviceProtocol;
744 /* ASSUME same EP0 fifo size at both speeds */
745 qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket;
746 qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER);
750 /*-------------------------------------------------------------------------*/
752 static void reset_config(struct usb_composite_dev *cdev)
754 struct usb_function *f;
756 DBG(cdev, "reset config\n");
758 list_for_each_entry(f, &cdev->config->functions, list) {
762 bitmap_zero(f->endpoints, 32);
765 cdev->delayed_status = 0;
768 static int set_config(struct usb_composite_dev *cdev,
769 const struct usb_ctrlrequest *ctrl, unsigned number)
771 struct usb_gadget *gadget = cdev->gadget;
772 struct usb_configuration *c = NULL;
773 int result = -EINVAL;
774 unsigned power = gadget_is_otg(gadget) ? 8 : 100;
778 list_for_each_entry(c, &cdev->configs, list) {
779 if (c->bConfigurationValue == number) {
781 * We disable the FDs of the previous
782 * configuration only if the new configuration
793 } else { /* Zero configuration value - need to reset the config */
799 DBG(cdev, "%s config #%d: %s\n",
800 usb_speed_string(gadget->speed),
801 number, c ? c->label : "unconfigured");
806 usb_gadget_set_state(gadget, USB_STATE_CONFIGURED);
809 /* Initialize all interfaces by setting them to altsetting zero. */
810 for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) {
811 struct usb_function *f = c->interface[tmp];
812 struct usb_descriptor_header **descriptors;
818 * Record which endpoints are used by the function. This is used
819 * to dispatch control requests targeted at that endpoint to the
820 * function's setup callback instead of the current
821 * configuration's setup callback.
823 descriptors = function_descriptors(f, gadget->speed);
825 for (; *descriptors; ++descriptors) {
826 struct usb_endpoint_descriptor *ep;
829 if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT)
832 ep = (struct usb_endpoint_descriptor *)*descriptors;
833 addr = ((ep->bEndpointAddress & 0x80) >> 3)
834 | (ep->bEndpointAddress & 0x0f);
835 set_bit(addr, f->endpoints);
838 result = f->set_alt(f, tmp, 0);
840 DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n",
841 tmp, f->name, f, result);
847 if (result == USB_GADGET_DELAYED_STATUS) {
849 "%s: interface %d (%s) requested delayed status\n",
850 __func__, tmp, f->name);
851 cdev->delayed_status++;
852 DBG(cdev, "delayed_status count %d\n",
853 cdev->delayed_status);
857 /* when we return, be sure our power usage is valid */
858 power = c->MaxPower ? c->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
859 if (gadget->speed < USB_SPEED_SUPER)
860 power = min(power, 500U);
862 power = min(power, 900U);
864 if (power <= USB_SELF_POWER_VBUS_MAX_DRAW)
865 usb_gadget_set_selfpowered(gadget);
867 usb_gadget_clear_selfpowered(gadget);
869 usb_gadget_vbus_draw(gadget, power);
870 if (result >= 0 && cdev->delayed_status)
871 result = USB_GADGET_DELAYED_STATUS;
875 int usb_add_config_only(struct usb_composite_dev *cdev,
876 struct usb_configuration *config)
878 struct usb_configuration *c;
880 if (!config->bConfigurationValue)
883 /* Prevent duplicate configuration identifiers */
884 list_for_each_entry(c, &cdev->configs, list) {
885 if (c->bConfigurationValue == config->bConfigurationValue)
890 list_add_tail(&config->list, &cdev->configs);
892 INIT_LIST_HEAD(&config->functions);
893 config->next_interface_id = 0;
894 memset(config->interface, 0, sizeof(config->interface));
898 EXPORT_SYMBOL_GPL(usb_add_config_only);
901 * usb_add_config() - add a configuration to a device.
902 * @cdev: wraps the USB gadget
903 * @config: the configuration, with bConfigurationValue assigned
904 * @bind: the configuration's bind function
905 * Context: single threaded during gadget setup
907 * One of the main tasks of a composite @bind() routine is to
908 * add each of the configurations it supports, using this routine.
910 * This function returns the value of the configuration's @bind(), which
911 * is zero for success else a negative errno value. Binding configurations
912 * assigns global resources including string IDs, and per-configuration
913 * resources such as interface IDs and endpoints.
915 int usb_add_config(struct usb_composite_dev *cdev,
916 struct usb_configuration *config,
917 int (*bind)(struct usb_configuration *))
919 int status = -EINVAL;
924 DBG(cdev, "adding config #%u '%s'/%p\n",
925 config->bConfigurationValue,
926 config->label, config);
928 status = usb_add_config_only(cdev, config);
932 status = bind(config);
934 while (!list_empty(&config->functions)) {
935 struct usb_function *f;
937 f = list_first_entry(&config->functions,
938 struct usb_function, list);
941 DBG(cdev, "unbind function '%s'/%p\n",
943 f->unbind(config, f);
944 /* may free memory for "f" */
947 list_del(&config->list);
952 DBG(cdev, "cfg %d/%p speeds:%s%s%s%s\n",
953 config->bConfigurationValue, config,
954 config->superspeed_plus ? " superplus" : "",
955 config->superspeed ? " super" : "",
956 config->highspeed ? " high" : "",
958 ? (gadget_is_dualspeed(cdev->gadget)
963 for (i = 0; i < MAX_CONFIG_INTERFACES; i++) {
964 struct usb_function *f = config->interface[i];
968 DBG(cdev, " interface %d = %s/%p\n",
973 /* set_alt(), or next bind(), sets up ep->claimed as needed */
974 usb_ep_autoconfig_reset(cdev->gadget);
978 DBG(cdev, "added config '%s'/%u --> %d\n", config->label,
979 config->bConfigurationValue, status);
982 EXPORT_SYMBOL_GPL(usb_add_config);
984 static void remove_config(struct usb_composite_dev *cdev,
985 struct usb_configuration *config)
987 while (!list_empty(&config->functions)) {
988 struct usb_function *f;
990 f = list_first_entry(&config->functions,
991 struct usb_function, list);
993 usb_remove_function(config, f);
995 list_del(&config->list);
996 if (config->unbind) {
997 DBG(cdev, "unbind config '%s'/%p\n", config->label, config);
998 config->unbind(config);
999 /* may free memory for "c" */
1004 * usb_remove_config() - remove a configuration from a device.
1005 * @cdev: wraps the USB gadget
1006 * @config: the configuration
1008 * Drivers must call usb_gadget_disconnect before calling this function
1009 * to disconnect the device from the host and make sure the host will not
1010 * try to enumerate the device while we are changing the config list.
1012 void usb_remove_config(struct usb_composite_dev *cdev,
1013 struct usb_configuration *config)
1015 unsigned long flags;
1017 spin_lock_irqsave(&cdev->lock, flags);
1019 if (cdev->config == config)
1022 spin_unlock_irqrestore(&cdev->lock, flags);
1024 remove_config(cdev, config);
1027 /*-------------------------------------------------------------------------*/
1029 /* We support strings in multiple languages ... string descriptor zero
1030 * says which languages are supported. The typical case will be that
1031 * only one language (probably English) is used, with i18n handled on
1035 static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf)
1037 const struct usb_gadget_strings *s;
1043 language = cpu_to_le16(s->language);
1044 for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) {
1045 if (*tmp == language)
1054 static int lookup_string(
1055 struct usb_gadget_strings **sp,
1061 struct usb_gadget_strings *s;
1066 if (s->language != language)
1068 value = usb_gadget_get_string(s, id, buf);
1075 static int get_string(struct usb_composite_dev *cdev,
1076 void *buf, u16 language, int id)
1078 struct usb_composite_driver *composite = cdev->driver;
1079 struct usb_gadget_string_container *uc;
1080 struct usb_configuration *c;
1081 struct usb_function *f;
1084 /* Yes, not only is USB's i18n support probably more than most
1085 * folk will ever care about ... also, it's all supported here.
1086 * (Except for UTF8 support for Unicode's "Astral Planes".)
1089 /* 0 == report all available language codes */
1091 struct usb_string_descriptor *s = buf;
1092 struct usb_gadget_strings **sp;
1095 s->bDescriptorType = USB_DT_STRING;
1097 sp = composite->strings;
1099 collect_langs(sp, s->wData);
1101 list_for_each_entry(c, &cdev->configs, list) {
1104 collect_langs(sp, s->wData);
1106 list_for_each_entry(f, &c->functions, list) {
1109 collect_langs(sp, s->wData);
1112 list_for_each_entry(uc, &cdev->gstrings, list) {
1113 struct usb_gadget_strings **sp;
1115 sp = get_containers_gs(uc);
1116 collect_langs(sp, s->wData);
1119 for (len = 0; len <= 126 && s->wData[len]; len++)
1124 s->bLength = 2 * (len + 1);
1128 if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) {
1129 struct usb_os_string *b = buf;
1130 b->bLength = sizeof(*b);
1131 b->bDescriptorType = USB_DT_STRING;
1133 sizeof(b->qwSignature) == sizeof(cdev->qw_sign),
1134 "qwSignature size must be equal to qw_sign");
1135 memcpy(&b->qwSignature, cdev->qw_sign, sizeof(b->qwSignature));
1136 b->bMS_VendorCode = cdev->b_vendor_code;
1141 list_for_each_entry(uc, &cdev->gstrings, list) {
1142 struct usb_gadget_strings **sp;
1144 sp = get_containers_gs(uc);
1145 len = lookup_string(sp, buf, language, id);
1150 /* String IDs are device-scoped, so we look up each string
1151 * table we're told about. These lookups are infrequent;
1152 * simpler-is-better here.
1154 if (composite->strings) {
1155 len = lookup_string(composite->strings, buf, language, id);
1159 list_for_each_entry(c, &cdev->configs, list) {
1161 len = lookup_string(c->strings, buf, language, id);
1165 list_for_each_entry(f, &c->functions, list) {
1168 len = lookup_string(f->strings, buf, language, id);
1177 * usb_string_id() - allocate an unused string ID
1178 * @cdev: the device whose string descriptor IDs are being allocated
1179 * Context: single threaded during gadget setup
1181 * @usb_string_id() is called from bind() callbacks to allocate
1182 * string IDs. Drivers for functions, configurations, or gadgets will
1183 * then store that ID in the appropriate descriptors and string table.
1185 * All string identifier should be allocated using this,
1186 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
1187 * that for example different functions don't wrongly assign different
1188 * meanings to the same identifier.
1190 int usb_string_id(struct usb_composite_dev *cdev)
1192 if (cdev->next_string_id < 254) {
1193 /* string id 0 is reserved by USB spec for list of
1194 * supported languages */
1195 /* 255 reserved as well? -- mina86 */
1196 cdev->next_string_id++;
1197 return cdev->next_string_id;
1201 EXPORT_SYMBOL_GPL(usb_string_id);
1204 * usb_string_ids() - allocate unused string IDs in batch
1205 * @cdev: the device whose string descriptor IDs are being allocated
1206 * @str: an array of usb_string objects to assign numbers to
1207 * Context: single threaded during gadget setup
1209 * @usb_string_ids() is called from bind() callbacks to allocate
1210 * string IDs. Drivers for functions, configurations, or gadgets will
1211 * then copy IDs from the string table to the appropriate descriptors
1212 * and string table for other languages.
1214 * All string identifier should be allocated using this,
1215 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1216 * example different functions don't wrongly assign different meanings
1217 * to the same identifier.
1219 int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
1221 int next = cdev->next_string_id;
1223 for (; str->s; ++str) {
1224 if (unlikely(next >= 254))
1229 cdev->next_string_id = next;
1233 EXPORT_SYMBOL_GPL(usb_string_ids_tab);
1235 static struct usb_gadget_string_container *copy_gadget_strings(
1236 struct usb_gadget_strings **sp, unsigned n_gstrings,
1239 struct usb_gadget_string_container *uc;
1240 struct usb_gadget_strings **gs_array;
1241 struct usb_gadget_strings *gs;
1242 struct usb_string *s;
1249 mem += sizeof(void *) * (n_gstrings + 1);
1250 mem += sizeof(struct usb_gadget_strings) * n_gstrings;
1251 mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings);
1252 uc = kmalloc(mem, GFP_KERNEL);
1254 return ERR_PTR(-ENOMEM);
1255 gs_array = get_containers_gs(uc);
1257 stash += sizeof(void *) * (n_gstrings + 1);
1258 for (n_gs = 0; n_gs < n_gstrings; n_gs++) {
1259 struct usb_string *org_s;
1261 gs_array[n_gs] = stash;
1262 gs = gs_array[n_gs];
1263 stash += sizeof(struct usb_gadget_strings);
1264 gs->language = sp[n_gs]->language;
1265 gs->strings = stash;
1266 org_s = sp[n_gs]->strings;
1268 for (n_s = 0; n_s < n_strings; n_s++) {
1270 stash += sizeof(struct usb_string);
1279 stash += sizeof(struct usb_string);
1282 gs_array[n_gs] = NULL;
1287 * usb_gstrings_attach() - attach gadget strings to a cdev and assign ids
1288 * @cdev: the device whose string descriptor IDs are being allocated
1290 * @sp: an array of usb_gadget_strings to attach.
1291 * @n_strings: number of entries in each usb_strings array (sp[]->strings)
1293 * This function will create a deep copy of usb_gadget_strings and usb_string
1294 * and attach it to the cdev. The actual string (usb_string.s) will not be
1295 * copied but only a referenced will be made. The struct usb_gadget_strings
1296 * array may contain multiple languages and should be NULL terminated.
1297 * The ->language pointer of each struct usb_gadget_strings has to contain the
1298 * same amount of entries.
1299 * For instance: sp[0] is en-US, sp[1] is es-ES. It is expected that the first
1300 * usb_string entry of es-ES contains the translation of the first usb_string
1301 * entry of en-US. Therefore both entries become the same id assign.
1303 struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
1304 struct usb_gadget_strings **sp, unsigned n_strings)
1306 struct usb_gadget_string_container *uc;
1307 struct usb_gadget_strings **n_gs;
1308 unsigned n_gstrings = 0;
1312 for (i = 0; sp[i]; i++)
1316 return ERR_PTR(-EINVAL);
1318 uc = copy_gadget_strings(sp, n_gstrings, n_strings);
1320 return ERR_CAST(uc);
1322 n_gs = get_containers_gs(uc);
1323 ret = usb_string_ids_tab(cdev, n_gs[0]->strings);
1327 for (i = 1; i < n_gstrings; i++) {
1328 struct usb_string *m_s;
1329 struct usb_string *s;
1332 m_s = n_gs[0]->strings;
1333 s = n_gs[i]->strings;
1334 for (n = 0; n < n_strings; n++) {
1340 list_add_tail(&uc->list, &cdev->gstrings);
1341 return n_gs[0]->strings;
1344 return ERR_PTR(ret);
1346 EXPORT_SYMBOL_GPL(usb_gstrings_attach);
1349 * usb_string_ids_n() - allocate unused string IDs in batch
1350 * @c: the device whose string descriptor IDs are being allocated
1351 * @n: number of string IDs to allocate
1352 * Context: single threaded during gadget setup
1354 * Returns the first requested ID. This ID and next @n-1 IDs are now
1355 * valid IDs. At least provided that @n is non-zero because if it
1356 * is, returns last requested ID which is now very useful information.
1358 * @usb_string_ids_n() is called from bind() callbacks to allocate
1359 * string IDs. Drivers for functions, configurations, or gadgets will
1360 * then store that ID in the appropriate descriptors and string table.
1362 * All string identifier should be allocated using this,
1363 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1364 * example different functions don't wrongly assign different meanings
1365 * to the same identifier.
1367 int usb_string_ids_n(struct usb_composite_dev *c, unsigned n)
1369 unsigned next = c->next_string_id;
1370 if (unlikely(n > 254 || (unsigned)next + n > 254))
1372 c->next_string_id += n;
1375 EXPORT_SYMBOL_GPL(usb_string_ids_n);
1377 /*-------------------------------------------------------------------------*/
1379 static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
1381 struct usb_composite_dev *cdev;
1383 if (req->status || req->actual != req->length)
1384 DBG((struct usb_composite_dev *) ep->driver_data,
1385 "setup complete --> %d, %d/%d\n",
1386 req->status, req->actual, req->length);
1389 * REVIST The same ep0 requests are shared with function drivers
1390 * so they don't have to maintain the same ->complete() stubs.
1392 * Because of that, we need to check for the validity of ->context
1393 * here, even though we know we've set it to something useful.
1398 cdev = req->context;
1400 if (cdev->req == req)
1401 cdev->setup_pending = false;
1402 else if (cdev->os_desc_req == req)
1403 cdev->os_desc_pending = false;
1405 WARN(1, "unknown request %p\n", req);
1408 static int composite_ep0_queue(struct usb_composite_dev *cdev,
1409 struct usb_request *req, gfp_t gfp_flags)
1413 ret = usb_ep_queue(cdev->gadget->ep0, req, gfp_flags);
1415 if (cdev->req == req)
1416 cdev->setup_pending = true;
1417 else if (cdev->os_desc_req == req)
1418 cdev->os_desc_pending = true;
1420 WARN(1, "unknown request %p\n", req);
1426 static int count_ext_compat(struct usb_configuration *c)
1431 for (i = 0; i < c->next_interface_id; ++i) {
1432 struct usb_function *f;
1435 f = c->interface[i];
1436 for (j = 0; j < f->os_desc_n; ++j) {
1437 struct usb_os_desc *d;
1439 if (i != f->os_desc_table[j].if_id)
1441 d = f->os_desc_table[j].os_desc;
1442 if (d && d->ext_compat_id)
1450 static int fill_ext_compat(struct usb_configuration *c, u8 *buf)
1456 for (i = 0; i < c->next_interface_id; ++i) {
1457 struct usb_function *f;
1460 f = c->interface[i];
1461 for (j = 0; j < f->os_desc_n; ++j) {
1462 struct usb_os_desc *d;
1464 if (i != f->os_desc_table[j].if_id)
1466 d = f->os_desc_table[j].os_desc;
1467 if (d && d->ext_compat_id) {
1470 memcpy(buf, d->ext_compat_id, 16);
1478 if (count + 24 >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1486 static int count_ext_prop(struct usb_configuration *c, int interface)
1488 struct usb_function *f;
1491 f = c->interface[interface];
1492 for (j = 0; j < f->os_desc_n; ++j) {
1493 struct usb_os_desc *d;
1495 if (interface != f->os_desc_table[j].if_id)
1497 d = f->os_desc_table[j].os_desc;
1498 if (d && d->ext_compat_id)
1499 return d->ext_prop_count;
1504 static int len_ext_prop(struct usb_configuration *c, int interface)
1506 struct usb_function *f;
1507 struct usb_os_desc *d;
1510 res = 10; /* header length */
1511 f = c->interface[interface];
1512 for (j = 0; j < f->os_desc_n; ++j) {
1513 if (interface != f->os_desc_table[j].if_id)
1515 d = f->os_desc_table[j].os_desc;
1517 return min(res + d->ext_prop_len, 4096);
1522 static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
1524 struct usb_function *f;
1525 struct usb_os_desc *d;
1526 struct usb_os_desc_ext_prop *ext_prop;
1527 int j, count, n, ret;
1529 f = c->interface[interface];
1530 count = 10; /* header length */
1532 for (j = 0; j < f->os_desc_n; ++j) {
1533 if (interface != f->os_desc_table[j].if_id)
1535 d = f->os_desc_table[j].os_desc;
1537 list_for_each_entry(ext_prop, &d->ext_prop, entry) {
1538 n = ext_prop->data_len +
1539 ext_prop->name_len + 14;
1540 if (count + n >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1542 usb_ext_prop_put_size(buf, n);
1543 usb_ext_prop_put_type(buf, ext_prop->type);
1544 ret = usb_ext_prop_put_name(buf, ext_prop->name,
1545 ext_prop->name_len);
1548 switch (ext_prop->type) {
1549 case USB_EXT_PROP_UNICODE:
1550 case USB_EXT_PROP_UNICODE_ENV:
1551 case USB_EXT_PROP_UNICODE_LINK:
1552 usb_ext_prop_put_unicode(buf, ret,
1554 ext_prop->data_len);
1556 case USB_EXT_PROP_BINARY:
1557 usb_ext_prop_put_binary(buf, ret,
1559 ext_prop->data_len);
1561 case USB_EXT_PROP_LE32:
1562 /* not implemented */
1563 case USB_EXT_PROP_BE32:
1564 /* not implemented */
1577 * The setup() callback implements all the ep0 functionality that's
1578 * not handled lower down, in hardware or the hardware driver(like
1579 * device and endpoint feature flags, and their status). It's all
1580 * housekeeping for the gadget function we're implementing. Most of
1581 * the work is in config and function specific setup.
1584 composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1586 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1587 struct usb_request *req = cdev->req;
1588 int value = -EOPNOTSUPP;
1590 u16 w_index = le16_to_cpu(ctrl->wIndex);
1591 u8 intf = w_index & 0xFF;
1592 u16 w_value = le16_to_cpu(ctrl->wValue);
1593 u16 w_length = le16_to_cpu(ctrl->wLength);
1594 struct usb_function *f = NULL;
1597 /* partial re-init of the response message; the function or the
1598 * gadget might need to intercept e.g. a control-OUT completion
1599 * when we delegate to it.
1602 req->context = cdev;
1603 req->complete = composite_setup_complete;
1605 gadget->ep0->driver_data = cdev;
1608 * Don't let non-standard requests match any of the cases below
1611 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
1614 switch (ctrl->bRequest) {
1616 /* we handle all standard USB descriptors */
1617 case USB_REQ_GET_DESCRIPTOR:
1618 if (ctrl->bRequestType != USB_DIR_IN)
1620 switch (w_value >> 8) {
1623 cdev->desc.bNumConfigurations =
1624 count_configs(cdev, USB_DT_DEVICE);
1625 cdev->desc.bMaxPacketSize0 =
1626 cdev->gadget->ep0->maxpacket;
1627 if (gadget_is_superspeed(gadget)) {
1628 if (gadget->speed >= USB_SPEED_SUPER) {
1629 cdev->desc.bcdUSB = cpu_to_le16(0x0320);
1630 cdev->desc.bMaxPacketSize0 = 9;
1632 cdev->desc.bcdUSB = cpu_to_le16(0x0210);
1635 if (gadget->lpm_capable)
1636 cdev->desc.bcdUSB = cpu_to_le16(0x0201);
1638 cdev->desc.bcdUSB = cpu_to_le16(0x0200);
1641 value = min(w_length, (u16) sizeof cdev->desc);
1642 memcpy(req->buf, &cdev->desc, value);
1644 case USB_DT_DEVICE_QUALIFIER:
1645 if (!gadget_is_dualspeed(gadget) ||
1646 gadget->speed >= USB_SPEED_SUPER)
1649 value = min_t(int, w_length,
1650 sizeof(struct usb_qualifier_descriptor));
1652 case USB_DT_OTHER_SPEED_CONFIG:
1653 if (!gadget_is_dualspeed(gadget) ||
1654 gadget->speed >= USB_SPEED_SUPER)
1658 value = config_desc(cdev, w_value);
1660 value = min(w_length, (u16) value);
1663 value = get_string(cdev, req->buf,
1664 w_index, w_value & 0xff);
1666 value = min(w_length, (u16) value);
1669 if (gadget_is_superspeed(gadget) ||
1670 gadget->lpm_capable) {
1671 value = bos_desc(cdev);
1672 value = min(w_length, (u16) value);
1676 if (gadget_is_otg(gadget)) {
1677 struct usb_configuration *config;
1678 int otg_desc_len = 0;
1681 config = cdev->config;
1683 config = list_first_entry(
1685 struct usb_configuration, list);
1689 if (gadget->otg_caps &&
1690 (gadget->otg_caps->otg_rev >= 0x0200))
1691 otg_desc_len += sizeof(
1692 struct usb_otg20_descriptor);
1694 otg_desc_len += sizeof(
1695 struct usb_otg_descriptor);
1697 value = min_t(int, w_length, otg_desc_len);
1698 memcpy(req->buf, config->descriptors[0], value);
1704 /* any number of configs can work */
1705 case USB_REQ_SET_CONFIGURATION:
1706 if (ctrl->bRequestType != 0)
1708 if (gadget_is_otg(gadget)) {
1709 if (gadget->a_hnp_support)
1710 DBG(cdev, "HNP available\n");
1711 else if (gadget->a_alt_hnp_support)
1712 DBG(cdev, "HNP on another port\n");
1714 VDBG(cdev, "HNP inactive\n");
1716 spin_lock(&cdev->lock);
1717 value = set_config(cdev, ctrl, w_value);
1718 spin_unlock(&cdev->lock);
1720 case USB_REQ_GET_CONFIGURATION:
1721 if (ctrl->bRequestType != USB_DIR_IN)
1724 *(u8 *)req->buf = cdev->config->bConfigurationValue;
1726 *(u8 *)req->buf = 0;
1727 value = min(w_length, (u16) 1);
1730 /* function drivers must handle get/set altsetting */
1731 case USB_REQ_SET_INTERFACE:
1732 if (ctrl->bRequestType != USB_RECIP_INTERFACE)
1734 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1736 f = cdev->config->interface[intf];
1741 * If there's no get_alt() method, we know only altsetting zero
1742 * works. There is no need to check if set_alt() is not NULL
1743 * as we check this in usb_add_function().
1745 if (w_value && !f->get_alt)
1748 spin_lock(&cdev->lock);
1749 value = f->set_alt(f, w_index, w_value);
1750 if (value == USB_GADGET_DELAYED_STATUS) {
1752 "%s: interface %d (%s) requested delayed status\n",
1753 __func__, intf, f->name);
1754 cdev->delayed_status++;
1755 DBG(cdev, "delayed_status count %d\n",
1756 cdev->delayed_status);
1758 spin_unlock(&cdev->lock);
1760 case USB_REQ_GET_INTERFACE:
1761 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
1763 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1765 f = cdev->config->interface[intf];
1768 /* lots of interfaces only need altsetting zero... */
1769 value = f->get_alt ? f->get_alt(f, w_index) : 0;
1772 *((u8 *)req->buf) = value;
1773 value = min(w_length, (u16) 1);
1775 case USB_REQ_GET_STATUS:
1776 if (gadget_is_otg(gadget) && gadget->hnp_polling_support &&
1777 (w_index == OTG_STS_SELECTOR)) {
1778 if (ctrl->bRequestType != (USB_DIR_IN |
1781 *((u8 *)req->buf) = gadget->host_request_flag;
1787 * USB 3.0 additions:
1788 * Function driver should handle get_status request. If such cb
1789 * wasn't supplied we respond with default value = 0
1790 * Note: function driver should supply such cb only for the
1791 * first interface of the function
1793 if (!gadget_is_superspeed(gadget))
1795 if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
1797 value = 2; /* This is the length of the get_status reply */
1798 put_unaligned_le16(0, req->buf);
1799 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1801 f = cdev->config->interface[intf];
1804 status = f->get_status ? f->get_status(f) : 0;
1807 put_unaligned_le16(status & 0x0000ffff, req->buf);
1810 * Function drivers should handle SetFeature/ClearFeature
1811 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
1812 * only for the first interface of the function
1814 case USB_REQ_CLEAR_FEATURE:
1815 case USB_REQ_SET_FEATURE:
1816 if (!gadget_is_superspeed(gadget))
1818 if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE))
1821 case USB_INTRF_FUNC_SUSPEND:
1822 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1824 f = cdev->config->interface[intf];
1828 if (f->func_suspend)
1829 value = f->func_suspend(f, w_index >> 8);
1832 "func_suspend() returned error %d\n",
1842 * OS descriptors handling
1844 if (cdev->use_os_string && cdev->os_desc_config &&
1845 (ctrl->bRequestType & USB_TYPE_VENDOR) &&
1846 ctrl->bRequest == cdev->b_vendor_code) {
1847 struct usb_configuration *os_desc_cfg;
1852 req = cdev->os_desc_req;
1853 req->context = cdev;
1854 req->complete = composite_setup_complete;
1856 os_desc_cfg = cdev->os_desc_config;
1857 w_length = min_t(u16, w_length, USB_COMP_EP0_OS_DESC_BUFSIZ);
1858 memset(buf, 0, w_length);
1860 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1861 case USB_RECIP_DEVICE:
1862 if (w_index != 0x4 || (w_value >> 8))
1865 /* Number of ext compat interfaces */
1866 count = count_ext_compat(os_desc_cfg);
1868 count *= 24; /* 24 B/ext compat desc */
1869 count += 16; /* header */
1870 put_unaligned_le32(count, buf);
1872 if (w_length > 0x10) {
1873 value = fill_ext_compat(os_desc_cfg, buf);
1874 value = min_t(u16, w_length, value);
1877 case USB_RECIP_INTERFACE:
1878 if (w_index != 0x5 || (w_value >> 8))
1880 interface = w_value & 0xFF;
1882 count = count_ext_prop(os_desc_cfg,
1884 put_unaligned_le16(count, buf + 8);
1885 count = len_ext_prop(os_desc_cfg,
1887 put_unaligned_le32(count, buf);
1889 if (w_length > 0x0A) {
1890 value = fill_ext_prop(os_desc_cfg,
1893 value = min_t(u16, w_length, value);
1902 "non-core control req%02x.%02x v%04x i%04x l%d\n",
1903 ctrl->bRequestType, ctrl->bRequest,
1904 w_value, w_index, w_length);
1906 /* functions always handle their interfaces and endpoints...
1907 * punt other recipients (other, WUSB, ...) to the current
1908 * configuration code.
1911 list_for_each_entry(f, &cdev->config->functions, list)
1913 f->req_match(f, ctrl, false))
1916 struct usb_configuration *c;
1917 list_for_each_entry(c, &cdev->configs, list)
1918 list_for_each_entry(f, &c->functions, list)
1920 f->req_match(f, ctrl, true))
1925 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1926 case USB_RECIP_INTERFACE:
1927 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1929 f = cdev->config->interface[intf];
1932 case USB_RECIP_ENDPOINT:
1935 endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f);
1936 list_for_each_entry(f, &cdev->config->functions, list) {
1937 if (test_bit(endp, f->endpoints))
1940 if (&f->list == &cdev->config->functions)
1946 value = f->setup(f, ctrl);
1948 struct usb_configuration *c;
1954 /* try current config's setup */
1956 value = c->setup(c, ctrl);
1960 /* try the only function in the current config */
1961 if (!list_is_singular(&c->functions))
1963 f = list_first_entry(&c->functions, struct usb_function,
1966 value = f->setup(f, ctrl);
1973 /* respond with data transfer before status phase? */
1974 if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) {
1975 req->length = value;
1976 req->context = cdev;
1977 req->zero = value < w_length;
1978 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
1980 DBG(cdev, "ep_queue --> %d\n", value);
1982 composite_setup_complete(gadget->ep0, req);
1984 } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) {
1986 "%s: Delayed status not supported for w_length != 0",
1991 /* device either stalls (value < 0) or reports success */
1995 void composite_disconnect(struct usb_gadget *gadget)
1997 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1998 unsigned long flags;
2000 /* REVISIT: should we have config and device level
2001 * disconnect callbacks?
2003 spin_lock_irqsave(&cdev->lock, flags);
2004 cdev->suspended = 0;
2007 if (cdev->driver->disconnect)
2008 cdev->driver->disconnect(cdev);
2009 spin_unlock_irqrestore(&cdev->lock, flags);
2012 /*-------------------------------------------------------------------------*/
2014 static ssize_t suspended_show(struct device *dev, struct device_attribute *attr,
2017 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
2018 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2020 return sprintf(buf, "%d\n", cdev->suspended);
2022 static DEVICE_ATTR_RO(suspended);
2024 static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
2026 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2027 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2028 struct usb_string *dev_str = gstr->strings;
2030 /* composite_disconnect() must already have been called
2031 * by the underlying peripheral controller driver!
2032 * so there's no i/o concurrency that could affect the
2033 * state protected by cdev->lock.
2035 WARN_ON(cdev->config);
2037 while (!list_empty(&cdev->configs)) {
2038 struct usb_configuration *c;
2039 c = list_first_entry(&cdev->configs,
2040 struct usb_configuration, list);
2041 remove_config(cdev, c);
2043 if (cdev->driver->unbind && unbind_driver)
2044 cdev->driver->unbind(cdev);
2046 composite_dev_cleanup(cdev);
2048 if (dev_str[USB_GADGET_MANUFACTURER_IDX].s == cdev->def_manufacturer)
2049 dev_str[USB_GADGET_MANUFACTURER_IDX].s = "";
2051 kfree(cdev->def_manufacturer);
2053 set_gadget_data(gadget, NULL);
2056 static void composite_unbind(struct usb_gadget *gadget)
2058 __composite_unbind(gadget, true);
2061 static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
2062 const struct usb_device_descriptor *old)
2072 * these variables may have been set in
2073 * usb_composite_overwrite_options()
2075 idVendor = new->idVendor;
2076 idProduct = new->idProduct;
2077 bcdDevice = new->bcdDevice;
2078 iSerialNumber = new->iSerialNumber;
2079 iManufacturer = new->iManufacturer;
2080 iProduct = new->iProduct;
2084 new->idVendor = idVendor;
2086 new->idProduct = idProduct;
2088 new->bcdDevice = bcdDevice;
2090 new->bcdDevice = cpu_to_le16(get_default_bcdDevice());
2092 new->iSerialNumber = iSerialNumber;
2094 new->iManufacturer = iManufacturer;
2096 new->iProduct = iProduct;
2099 int composite_dev_prepare(struct usb_composite_driver *composite,
2100 struct usb_composite_dev *cdev)
2102 struct usb_gadget *gadget = cdev->gadget;
2105 /* preallocate control response and buffer */
2106 cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
2110 cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
2111 if (!cdev->req->buf)
2114 ret = device_create_file(&gadget->dev, &dev_attr_suspended);
2118 cdev->req->complete = composite_setup_complete;
2119 cdev->req->context = cdev;
2120 gadget->ep0->driver_data = cdev;
2122 cdev->driver = composite;
2125 * As per USB compliance update, a device that is actively drawing
2126 * more than 100mA from USB must report itself as bus-powered in
2127 * the GetStatus(DEVICE) call.
2129 if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW)
2130 usb_gadget_set_selfpowered(gadget);
2132 /* interface and string IDs start at zero via kzalloc.
2133 * we force endpoints to start unassigned; few controller
2134 * drivers will zero ep->driver_data.
2136 usb_ep_autoconfig_reset(gadget);
2139 kfree(cdev->req->buf);
2141 usb_ep_free_request(gadget->ep0, cdev->req);
2146 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
2151 cdev->os_desc_req = usb_ep_alloc_request(ep0, GFP_KERNEL);
2152 if (!cdev->os_desc_req) {
2157 cdev->os_desc_req->buf = kmalloc(USB_COMP_EP0_OS_DESC_BUFSIZ,
2159 if (!cdev->os_desc_req->buf) {
2161 usb_ep_free_request(ep0, cdev->os_desc_req);
2164 cdev->os_desc_req->context = cdev;
2165 cdev->os_desc_req->complete = composite_setup_complete;
2170 void composite_dev_cleanup(struct usb_composite_dev *cdev)
2172 struct usb_gadget_string_container *uc, *tmp;
2173 struct usb_ep *ep, *tmp_ep;
2175 list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
2176 list_del(&uc->list);
2179 if (cdev->os_desc_req) {
2180 if (cdev->os_desc_pending)
2181 usb_ep_dequeue(cdev->gadget->ep0, cdev->os_desc_req);
2183 kfree(cdev->os_desc_req->buf);
2184 cdev->os_desc_req->buf = NULL;
2185 usb_ep_free_request(cdev->gadget->ep0, cdev->os_desc_req);
2186 cdev->os_desc_req = NULL;
2189 if (cdev->setup_pending)
2190 usb_ep_dequeue(cdev->gadget->ep0, cdev->req);
2192 kfree(cdev->req->buf);
2193 cdev->req->buf = NULL;
2194 usb_ep_free_request(cdev->gadget->ep0, cdev->req);
2197 cdev->next_string_id = 0;
2198 device_remove_file(&cdev->gadget->dev, &dev_attr_suspended);
2201 * Some UDC backends have a dynamic EP allocation scheme.
2203 * In that case, the dispose() callback is used to notify the
2204 * backend that the EPs are no longer in use.
2206 * Note: The UDC backend can remove the EP from the ep_list as
2207 * a result, so we need to use the _safe list iterator.
2209 list_for_each_entry_safe(ep, tmp_ep,
2210 &cdev->gadget->ep_list, ep_list) {
2211 if (ep->ops->dispose)
2212 ep->ops->dispose(ep);
2216 static int composite_bind(struct usb_gadget *gadget,
2217 struct usb_gadget_driver *gdriver)
2219 struct usb_composite_dev *cdev;
2220 struct usb_composite_driver *composite = to_cdriver(gdriver);
2221 int status = -ENOMEM;
2223 cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
2227 spin_lock_init(&cdev->lock);
2228 cdev->gadget = gadget;
2229 set_gadget_data(gadget, cdev);
2230 INIT_LIST_HEAD(&cdev->configs);
2231 INIT_LIST_HEAD(&cdev->gstrings);
2233 status = composite_dev_prepare(composite, cdev);
2237 /* composite gadget needs to assign strings for whole device (like
2238 * serial number), register function drivers, potentially update
2239 * power state and consumption, etc
2241 status = composite->bind(cdev);
2245 if (cdev->use_os_string) {
2246 status = composite_os_desc_req_prepare(cdev, gadget->ep0);
2251 update_unchanged_dev_desc(&cdev->desc, composite->dev);
2253 /* has userspace failed to provide a serial number? */
2254 if (composite->needs_serial && !cdev->desc.iSerialNumber)
2255 WARNING(cdev, "userspace failed to provide iSerialNumber\n");
2257 INFO(cdev, "%s ready\n", composite->name);
2261 __composite_unbind(gadget, false);
2265 /*-------------------------------------------------------------------------*/
2267 void composite_suspend(struct usb_gadget *gadget)
2269 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2270 struct usb_function *f;
2272 /* REVISIT: should we have config level
2273 * suspend/resume callbacks?
2275 DBG(cdev, "suspend\n");
2277 list_for_each_entry(f, &cdev->config->functions, list) {
2282 if (cdev->driver->suspend)
2283 cdev->driver->suspend(cdev);
2285 cdev->suspended = 1;
2287 usb_gadget_set_selfpowered(gadget);
2288 usb_gadget_vbus_draw(gadget, 2);
2291 void composite_resume(struct usb_gadget *gadget)
2293 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2294 struct usb_function *f;
2297 /* REVISIT: should we have config level
2298 * suspend/resume callbacks?
2300 DBG(cdev, "resume\n");
2301 if (cdev->driver->resume)
2302 cdev->driver->resume(cdev);
2304 list_for_each_entry(f, &cdev->config->functions, list) {
2309 maxpower = cdev->config->MaxPower ?
2310 cdev->config->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
2311 if (gadget->speed < USB_SPEED_SUPER)
2312 maxpower = min(maxpower, 500U);
2314 maxpower = min(maxpower, 900U);
2316 if (maxpower > USB_SELF_POWER_VBUS_MAX_DRAW)
2317 usb_gadget_clear_selfpowered(gadget);
2319 usb_gadget_vbus_draw(gadget, maxpower);
2322 cdev->suspended = 0;
2325 /*-------------------------------------------------------------------------*/
2327 static const struct usb_gadget_driver composite_driver_template = {
2328 .bind = composite_bind,
2329 .unbind = composite_unbind,
2331 .setup = composite_setup,
2332 .reset = composite_disconnect,
2333 .disconnect = composite_disconnect,
2335 .suspend = composite_suspend,
2336 .resume = composite_resume,
2339 .owner = THIS_MODULE,
2344 * usb_composite_probe() - register a composite driver
2345 * @driver: the driver to register
2347 * Context: single threaded during gadget setup
2349 * This function is used to register drivers using the composite driver
2350 * framework. The return value is zero, or a negative errno value.
2351 * Those values normally come from the driver's @bind method, which does
2352 * all the work of setting up the driver to match the hardware.
2354 * On successful return, the gadget is ready to respond to requests from
2355 * the host, unless one of its components invokes usb_gadget_disconnect()
2356 * while it was binding. That would usually be done in order to wait for
2357 * some userspace participation.
2359 int usb_composite_probe(struct usb_composite_driver *driver)
2361 struct usb_gadget_driver *gadget_driver;
2363 if (!driver || !driver->dev || !driver->bind)
2367 driver->name = "composite";
2369 driver->gadget_driver = composite_driver_template;
2370 gadget_driver = &driver->gadget_driver;
2372 gadget_driver->function = (char *) driver->name;
2373 gadget_driver->driver.name = driver->name;
2374 gadget_driver->max_speed = driver->max_speed;
2376 return usb_gadget_probe_driver(gadget_driver);
2378 EXPORT_SYMBOL_GPL(usb_composite_probe);
2381 * usb_composite_unregister() - unregister a composite driver
2382 * @driver: the driver to unregister
2384 * This function is used to unregister drivers using the composite
2387 void usb_composite_unregister(struct usb_composite_driver *driver)
2389 usb_gadget_unregister_driver(&driver->gadget_driver);
2391 EXPORT_SYMBOL_GPL(usb_composite_unregister);
2394 * usb_composite_setup_continue() - Continue with the control transfer
2395 * @cdev: the composite device who's control transfer was kept waiting
2397 * This function must be called by the USB function driver to continue
2398 * with the control transfer's data/status stage in case it had requested to
2399 * delay the data/status stages. A USB function's setup handler (e.g. set_alt())
2400 * can request the composite framework to delay the setup request's data/status
2401 * stages by returning USB_GADGET_DELAYED_STATUS.
2403 void usb_composite_setup_continue(struct usb_composite_dev *cdev)
2406 struct usb_request *req = cdev->req;
2407 unsigned long flags;
2409 DBG(cdev, "%s\n", __func__);
2410 spin_lock_irqsave(&cdev->lock, flags);
2412 if (cdev->delayed_status == 0) {
2413 WARN(cdev, "%s: Unexpected call\n", __func__);
2415 } else if (--cdev->delayed_status == 0) {
2416 DBG(cdev, "%s: Completing delayed status\n", __func__);
2418 req->context = cdev;
2419 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2421 DBG(cdev, "ep_queue --> %d\n", value);
2423 composite_setup_complete(cdev->gadget->ep0, req);
2427 spin_unlock_irqrestore(&cdev->lock, flags);
2429 EXPORT_SYMBOL_GPL(usb_composite_setup_continue);
2431 static char *composite_default_mfr(struct usb_gadget *gadget)
2433 return kasprintf(GFP_KERNEL, "%s %s with %s", init_utsname()->sysname,
2434 init_utsname()->release, gadget->name);
2437 void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
2438 struct usb_composite_overwrite *covr)
2440 struct usb_device_descriptor *desc = &cdev->desc;
2441 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2442 struct usb_string *dev_str = gstr->strings;
2445 desc->idVendor = cpu_to_le16(covr->idVendor);
2447 if (covr->idProduct)
2448 desc->idProduct = cpu_to_le16(covr->idProduct);
2450 if (covr->bcdDevice)
2451 desc->bcdDevice = cpu_to_le16(covr->bcdDevice);
2453 if (covr->serial_number) {
2454 desc->iSerialNumber = dev_str[USB_GADGET_SERIAL_IDX].id;
2455 dev_str[USB_GADGET_SERIAL_IDX].s = covr->serial_number;
2457 if (covr->manufacturer) {
2458 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2459 dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer;
2461 } else if (!strlen(dev_str[USB_GADGET_MANUFACTURER_IDX].s)) {
2462 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2463 cdev->def_manufacturer = composite_default_mfr(cdev->gadget);
2464 dev_str[USB_GADGET_MANUFACTURER_IDX].s = cdev->def_manufacturer;
2467 if (covr->product) {
2468 desc->iProduct = dev_str[USB_GADGET_PRODUCT_IDX].id;
2469 dev_str[USB_GADGET_PRODUCT_IDX].s = covr->product;
2472 EXPORT_SYMBOL_GPL(usb_composite_overwrite_options);
2474 MODULE_LICENSE("GPL");
2475 MODULE_AUTHOR("David Brownell");