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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>
17
18#include <linux/usb/composite.h>
19#include <linux/usb/otg.h>
20#include <asm/unaligned.h>
21
22#include "u_os_desc.h"
23
24
25
26
27
28
29
30
31
32struct usb_os_string {
33 __u8 bLength;
34 __u8 bDescriptorType;
35 __u8 qwSignature[OS_STRING_QW_SIGN_LEN];
36 __u8 bMS_VendorCode;
37 __u8 bPad;
38} __packed;
39
40
41
42
43
44
45
46
47static struct usb_gadget_strings **get_containers_gs(
48 struct usb_gadget_string_container *uc)
49{
50 return (struct usb_gadget_strings **)uc->stash;
51}
52
53
54
55
56
57
58
59
60static struct usb_descriptor_header **
61function_descriptors(struct usb_function *f,
62 enum usb_device_speed speed)
63{
64 struct usb_descriptor_header **descriptors;
65
66
67
68
69
70
71 switch (speed) {
72 case USB_SPEED_SUPER_PLUS:
73 descriptors = f->ssp_descriptors;
74 if (descriptors)
75 break;
76 fallthrough;
77 case USB_SPEED_SUPER:
78 descriptors = f->ss_descriptors;
79 if (descriptors)
80 break;
81 fallthrough;
82 case USB_SPEED_HIGH:
83 descriptors = f->hs_descriptors;
84 if (descriptors)
85 break;
86 fallthrough;
87 default:
88 descriptors = f->fs_descriptors;
89 }
90
91
92
93
94
95
96 return descriptors;
97}
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99
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107
108
109static struct usb_descriptor_header**
110next_desc(struct usb_descriptor_header **t, u8 desc_type)
111{
112 for (; *t; t++) {
113 if ((*t)->bDescriptorType == desc_type)
114 return t;
115 }
116 return NULL;
117}
118
119
120
121
122
123
124
125
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))
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130
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147
148
149int config_ep_by_speed_and_alt(struct usb_gadget *g,
150 struct usb_function *f,
151 struct usb_ep *_ep,
152 u8 alt)
153{
154 struct usb_endpoint_descriptor *chosen_desc = NULL;
155 struct usb_interface_descriptor *int_desc = NULL;
156 struct usb_descriptor_header **speed_desc = NULL;
157
158 struct usb_ss_ep_comp_descriptor *comp_desc = NULL;
159 int want_comp_desc = 0;
160
161 struct usb_descriptor_header **d_spd;
162
163 if (!g || !f || !_ep)
164 return -EIO;
165
166
167 switch (g->speed) {
168 case USB_SPEED_SUPER_PLUS:
169 if (gadget_is_superspeed_plus(g)) {
170 speed_desc = f->ssp_descriptors;
171 want_comp_desc = 1;
172 break;
173 }
174 fallthrough;
175 case USB_SPEED_SUPER:
176 if (gadget_is_superspeed(g)) {
177 speed_desc = f->ss_descriptors;
178 want_comp_desc = 1;
179 break;
180 }
181 fallthrough;
182 case USB_SPEED_HIGH:
183 if (gadget_is_dualspeed(g)) {
184 speed_desc = f->hs_descriptors;
185 break;
186 }
187 fallthrough;
188 default:
189 speed_desc = f->fs_descriptors;
190 }
191
192
193 for_each_desc(speed_desc, d_spd, USB_DT_INTERFACE) {
194 int_desc = (struct usb_interface_descriptor *)*d_spd;
195
196 if (int_desc->bAlternateSetting == alt) {
197 speed_desc = d_spd;
198 goto intf_found;
199 }
200 }
201 return -EIO;
202
203intf_found:
204
205 for_each_desc(speed_desc, d_spd, USB_DT_ENDPOINT) {
206 chosen_desc = (struct usb_endpoint_descriptor *)*d_spd;
207 if (chosen_desc->bEndpointAddress == _ep->address)
208 goto ep_found;
209 }
210 return -EIO;
211
212ep_found:
213
214 _ep->maxpacket = usb_endpoint_maxp(chosen_desc);
215 _ep->desc = chosen_desc;
216 _ep->comp_desc = NULL;
217 _ep->maxburst = 0;
218 _ep->mult = 1;
219
220 if (g->speed == USB_SPEED_HIGH && (usb_endpoint_xfer_isoc(_ep->desc) ||
221 usb_endpoint_xfer_int(_ep->desc)))
222 _ep->mult = usb_endpoint_maxp_mult(_ep->desc);
223
224 if (!want_comp_desc)
225 return 0;
226
227
228
229
230
231 comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd);
232 if (!comp_desc ||
233 (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP))
234 return -EIO;
235 _ep->comp_desc = comp_desc;
236 if (g->speed >= USB_SPEED_SUPER) {
237 switch (usb_endpoint_type(_ep->desc)) {
238 case USB_ENDPOINT_XFER_ISOC:
239
240 _ep->mult = (comp_desc->bmAttributes & 0x3) + 1;
241 fallthrough;
242 case USB_ENDPOINT_XFER_BULK:
243 case USB_ENDPOINT_XFER_INT:
244 _ep->maxburst = comp_desc->bMaxBurst + 1;
245 break;
246 default:
247 if (comp_desc->bMaxBurst != 0) {
248 struct usb_composite_dev *cdev;
249
250 cdev = get_gadget_data(g);
251 ERROR(cdev, "ep0 bMaxBurst must be 0\n");
252 }
253 _ep->maxburst = 1;
254 break;
255 }
256 }
257 return 0;
258}
259EXPORT_SYMBOL_GPL(config_ep_by_speed_and_alt);
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279int config_ep_by_speed(struct usb_gadget *g,
280 struct usb_function *f,
281 struct usb_ep *_ep)
282{
283 return config_ep_by_speed_and_alt(g, f, _ep, 0);
284}
285EXPORT_SYMBOL_GPL(config_ep_by_speed);
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301int usb_add_function(struct usb_configuration *config,
302 struct usb_function *function)
303{
304 int value = -EINVAL;
305
306 DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n",
307 function->name, function,
308 config->label, config);
309
310 if (!function->set_alt || !function->disable)
311 goto done;
312
313 function->config = config;
314 list_add_tail(&function->list, &config->functions);
315
316 if (function->bind_deactivated) {
317 value = usb_function_deactivate(function);
318 if (value)
319 goto done;
320 }
321
322
323 if (function->bind) {
324 value = function->bind(config, function);
325 if (value < 0) {
326 list_del(&function->list);
327 function->config = NULL;
328 }
329 } else
330 value = 0;
331
332
333
334
335
336
337 if (!config->fullspeed && function->fs_descriptors)
338 config->fullspeed = true;
339 if (!config->highspeed && function->hs_descriptors)
340 config->highspeed = true;
341 if (!config->superspeed && function->ss_descriptors)
342 config->superspeed = true;
343 if (!config->superspeed_plus && function->ssp_descriptors)
344 config->superspeed_plus = true;
345
346done:
347 if (value)
348 DBG(config->cdev, "adding '%s'/%p --> %d\n",
349 function->name, function, value);
350 return value;
351}
352EXPORT_SYMBOL_GPL(usb_add_function);
353
354void usb_remove_function(struct usb_configuration *c, struct usb_function *f)
355{
356 if (f->disable)
357 f->disable(f);
358
359 bitmap_zero(f->endpoints, 32);
360 list_del(&f->list);
361 if (f->unbind)
362 f->unbind(c, f);
363
364 if (f->bind_deactivated)
365 usb_function_activate(f);
366}
367EXPORT_SYMBOL_GPL(usb_remove_function);
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386
387
388int usb_function_deactivate(struct usb_function *function)
389{
390 struct usb_composite_dev *cdev = function->config->cdev;
391 unsigned long flags;
392 int status = 0;
393
394 spin_lock_irqsave(&cdev->lock, flags);
395
396 if (cdev->deactivations == 0) {
397 spin_unlock_irqrestore(&cdev->lock, flags);
398 status = usb_gadget_deactivate(cdev->gadget);
399 spin_lock_irqsave(&cdev->lock, flags);
400 }
401 if (status == 0)
402 cdev->deactivations++;
403
404 spin_unlock_irqrestore(&cdev->lock, flags);
405 return status;
406}
407EXPORT_SYMBOL_GPL(usb_function_deactivate);
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416
417
418
419int usb_function_activate(struct usb_function *function)
420{
421 struct usb_composite_dev *cdev = function->config->cdev;
422 unsigned long flags;
423 int status = 0;
424
425 spin_lock_irqsave(&cdev->lock, flags);
426
427 if (WARN_ON(cdev->deactivations == 0))
428 status = -EINVAL;
429 else {
430 cdev->deactivations--;
431 if (cdev->deactivations == 0) {
432 spin_unlock_irqrestore(&cdev->lock, flags);
433 status = usb_gadget_activate(cdev->gadget);
434 spin_lock_irqsave(&cdev->lock, flags);
435 }
436 }
437
438 spin_unlock_irqrestore(&cdev->lock, flags);
439 return status;
440}
441EXPORT_SYMBOL_GPL(usb_function_activate);
442
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466int usb_interface_id(struct usb_configuration *config,
467 struct usb_function *function)
468{
469 unsigned id = config->next_interface_id;
470
471 if (id < MAX_CONFIG_INTERFACES) {
472 config->interface[id] = function;
473 config->next_interface_id = id + 1;
474 return id;
475 }
476 return -ENODEV;
477}
478EXPORT_SYMBOL_GPL(usb_interface_id);
479
480static u8 encode_bMaxPower(enum usb_device_speed speed,
481 struct usb_configuration *c)
482{
483 unsigned val;
484
485 if (c->MaxPower || (c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))
486 val = c->MaxPower;
487 else
488 val = CONFIG_USB_GADGET_VBUS_DRAW;
489 if (!val)
490 return 0;
491 if (speed < USB_SPEED_SUPER)
492 return min(val, 500U) / 2;
493 else
494
495
496
497
498 return min(val, 900U) / 8;
499}
500
501static int config_buf(struct usb_configuration *config,
502 enum usb_device_speed speed, void *buf, u8 type)
503{
504 struct usb_config_descriptor *c = buf;
505 void *next = buf + USB_DT_CONFIG_SIZE;
506 int len;
507 struct usb_function *f;
508 int status;
509
510 len = USB_COMP_EP0_BUFSIZ - USB_DT_CONFIG_SIZE;
511
512 c = buf;
513 c->bLength = USB_DT_CONFIG_SIZE;
514 c->bDescriptorType = type;
515
516 c->bNumInterfaces = config->next_interface_id;
517 c->bConfigurationValue = config->bConfigurationValue;
518 c->iConfiguration = config->iConfiguration;
519 c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes;
520 c->bMaxPower = encode_bMaxPower(speed, config);
521
522
523 if (config->descriptors) {
524 status = usb_descriptor_fillbuf(next, len,
525 config->descriptors);
526 if (status < 0)
527 return status;
528 len -= status;
529 next += status;
530 }
531
532
533 list_for_each_entry(f, &config->functions, list) {
534 struct usb_descriptor_header **descriptors;
535
536 descriptors = function_descriptors(f, speed);
537 if (!descriptors)
538 continue;
539 status = usb_descriptor_fillbuf(next, len,
540 (const struct usb_descriptor_header **) descriptors);
541 if (status < 0)
542 return status;
543 len -= status;
544 next += status;
545 }
546
547 len = next - buf;
548 c->wTotalLength = cpu_to_le16(len);
549 return len;
550}
551
552static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
553{
554 struct usb_gadget *gadget = cdev->gadget;
555 struct usb_configuration *c;
556 struct list_head *pos;
557 u8 type = w_value >> 8;
558 enum usb_device_speed speed = USB_SPEED_UNKNOWN;
559
560 if (gadget->speed >= USB_SPEED_SUPER)
561 speed = gadget->speed;
562 else if (gadget_is_dualspeed(gadget)) {
563 int hs = 0;
564 if (gadget->speed == USB_SPEED_HIGH)
565 hs = 1;
566 if (type == USB_DT_OTHER_SPEED_CONFIG)
567 hs = !hs;
568 if (hs)
569 speed = USB_SPEED_HIGH;
570
571 }
572
573
574 w_value &= 0xff;
575
576 pos = &cdev->configs;
577 c = cdev->os_desc_config;
578 if (c)
579 goto check_config;
580
581 while ((pos = pos->next) != &cdev->configs) {
582 c = list_entry(pos, typeof(*c), list);
583
584
585 if (c == cdev->os_desc_config)
586 continue;
587
588check_config:
589
590 switch (speed) {
591 case USB_SPEED_SUPER_PLUS:
592 if (!c->superspeed_plus)
593 continue;
594 break;
595 case USB_SPEED_SUPER:
596 if (!c->superspeed)
597 continue;
598 break;
599 case USB_SPEED_HIGH:
600 if (!c->highspeed)
601 continue;
602 break;
603 default:
604 if (!c->fullspeed)
605 continue;
606 }
607
608 if (w_value == 0)
609 return config_buf(c, speed, cdev->req->buf, type);
610 w_value--;
611 }
612 return -EINVAL;
613}
614
615static int count_configs(struct usb_composite_dev *cdev, unsigned type)
616{
617 struct usb_gadget *gadget = cdev->gadget;
618 struct usb_configuration *c;
619 unsigned count = 0;
620 int hs = 0;
621 int ss = 0;
622 int ssp = 0;
623
624 if (gadget_is_dualspeed(gadget)) {
625 if (gadget->speed == USB_SPEED_HIGH)
626 hs = 1;
627 if (gadget->speed == USB_SPEED_SUPER)
628 ss = 1;
629 if (gadget->speed == USB_SPEED_SUPER_PLUS)
630 ssp = 1;
631 if (type == USB_DT_DEVICE_QUALIFIER)
632 hs = !hs;
633 }
634 list_for_each_entry(c, &cdev->configs, list) {
635
636 if (ssp) {
637 if (!c->superspeed_plus)
638 continue;
639 } else if (ss) {
640 if (!c->superspeed)
641 continue;
642 } else if (hs) {
643 if (!c->highspeed)
644 continue;
645 } else {
646 if (!c->fullspeed)
647 continue;
648 }
649 count++;
650 }
651 return count;
652}
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661
662
663static int bos_desc(struct usb_composite_dev *cdev)
664{
665 struct usb_ext_cap_descriptor *usb_ext;
666 struct usb_dcd_config_params dcd_config_params;
667 struct usb_bos_descriptor *bos = cdev->req->buf;
668 unsigned int besl = 0;
669
670 bos->bLength = USB_DT_BOS_SIZE;
671 bos->bDescriptorType = USB_DT_BOS;
672
673 bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
674 bos->bNumDeviceCaps = 0;
675
676
677 if (cdev->gadget->ops->get_config_params) {
678 cdev->gadget->ops->get_config_params(cdev->gadget,
679 &dcd_config_params);
680 } else {
681 dcd_config_params.besl_baseline =
682 USB_DEFAULT_BESL_UNSPECIFIED;
683 dcd_config_params.besl_deep =
684 USB_DEFAULT_BESL_UNSPECIFIED;
685 dcd_config_params.bU1devExitLat =
686 USB_DEFAULT_U1_DEV_EXIT_LAT;
687 dcd_config_params.bU2DevExitLat =
688 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
689 }
690
691 if (dcd_config_params.besl_baseline != USB_DEFAULT_BESL_UNSPECIFIED)
692 besl = USB_BESL_BASELINE_VALID |
693 USB_SET_BESL_BASELINE(dcd_config_params.besl_baseline);
694
695 if (dcd_config_params.besl_deep != USB_DEFAULT_BESL_UNSPECIFIED)
696 besl |= USB_BESL_DEEP_VALID |
697 USB_SET_BESL_DEEP(dcd_config_params.besl_deep);
698
699
700
701
702
703 usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
704 bos->bNumDeviceCaps++;
705 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
706 usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
707 usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
708 usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
709 usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT |
710 USB_BESL_SUPPORT | besl);
711
712
713
714
715
716 if (gadget_is_superspeed(cdev->gadget)) {
717 struct usb_ss_cap_descriptor *ss_cap;
718
719 ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
720 bos->bNumDeviceCaps++;
721 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
722 ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
723 ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
724 ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
725 ss_cap->bmAttributes = 0;
726 ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
727 USB_FULL_SPEED_OPERATION |
728 USB_HIGH_SPEED_OPERATION |
729 USB_5GBPS_OPERATION);
730 ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
731 ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
732 ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
733 }
734
735
736 if (gadget_is_superspeed_plus(cdev->gadget)) {
737 struct usb_ssp_cap_descriptor *ssp_cap;
738 u8 ssac = 1;
739 u8 ssic;
740 int i;
741
742 if (cdev->gadget->max_ssp_rate == USB_SSP_GEN_2x2)
743 ssac = 3;
744
745
746
747
748
749 ssic = (ssac + 1) / 2 - 1;
750
751 ssp_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
752 bos->bNumDeviceCaps++;
753
754 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SSP_CAP_SIZE(ssac));
755 ssp_cap->bLength = USB_DT_USB_SSP_CAP_SIZE(ssac);
756 ssp_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
757 ssp_cap->bDevCapabilityType = USB_SSP_CAP_TYPE;
758 ssp_cap->bReserved = 0;
759 ssp_cap->wReserved = 0;
760
761 ssp_cap->bmAttributes =
762 cpu_to_le32(FIELD_PREP(USB_SSP_SUBLINK_SPEED_ATTRIBS, ssac) |
763 FIELD_PREP(USB_SSP_SUBLINK_SPEED_IDS, ssic));
764
765 ssp_cap->wFunctionalitySupport =
766 cpu_to_le16(FIELD_PREP(USB_SSP_MIN_SUBLINK_SPEED_ATTRIBUTE_ID, 0) |
767 FIELD_PREP(USB_SSP_MIN_RX_LANE_COUNT, 1) |
768 FIELD_PREP(USB_SSP_MIN_TX_LANE_COUNT, 1));
769
770
771
772
773
774
775
776
777
778
779
780
781
782 for (i = 0; i < ssac + 1; i++) {
783 u8 ssid;
784 u8 mantissa;
785 u8 type;
786
787 ssid = i >> 1;
788
789 if (cdev->gadget->max_ssp_rate == USB_SSP_GEN_2x1 ||
790 cdev->gadget->max_ssp_rate == USB_SSP_GEN_UNKNOWN)
791 mantissa = 10;
792 else
793 mantissa = 5 << ssid;
794
795 if (i % 2)
796 type = USB_SSP_SUBLINK_SPEED_ST_SYM_TX;
797 else
798 type = USB_SSP_SUBLINK_SPEED_ST_SYM_RX;
799
800 ssp_cap->bmSublinkSpeedAttr[i] =
801 cpu_to_le32(FIELD_PREP(USB_SSP_SUBLINK_SPEED_SSID, ssid) |
802 FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSE,
803 USB_SSP_SUBLINK_SPEED_LSE_GBPS) |
804 FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST, type) |
805 FIELD_PREP(USB_SSP_SUBLINK_SPEED_LP,
806 USB_SSP_SUBLINK_SPEED_LP_SSP) |
807 FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSM, mantissa));
808 }
809 }
810
811 return le16_to_cpu(bos->wTotalLength);
812}
813
814static void device_qual(struct usb_composite_dev *cdev)
815{
816 struct usb_qualifier_descriptor *qual = cdev->req->buf;
817
818 qual->bLength = sizeof(*qual);
819 qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
820
821 qual->bcdUSB = cdev->desc.bcdUSB;
822 qual->bDeviceClass = cdev->desc.bDeviceClass;
823 qual->bDeviceSubClass = cdev->desc.bDeviceSubClass;
824 qual->bDeviceProtocol = cdev->desc.bDeviceProtocol;
825
826 qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket;
827 qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER);
828 qual->bRESERVED = 0;
829}
830
831
832
833static void reset_config(struct usb_composite_dev *cdev)
834{
835 struct usb_function *f;
836
837 DBG(cdev, "reset config\n");
838
839 list_for_each_entry(f, &cdev->config->functions, list) {
840 if (f->disable)
841 f->disable(f);
842
843 bitmap_zero(f->endpoints, 32);
844 }
845 cdev->config = NULL;
846 cdev->delayed_status = 0;
847}
848
849static int set_config(struct usb_composite_dev *cdev,
850 const struct usb_ctrlrequest *ctrl, unsigned number)
851{
852 struct usb_gadget *gadget = cdev->gadget;
853 struct usb_configuration *c = NULL;
854 int result = -EINVAL;
855 unsigned power = gadget_is_otg(gadget) ? 8 : 100;
856 int tmp;
857
858 if (number) {
859 list_for_each_entry(c, &cdev->configs, list) {
860 if (c->bConfigurationValue == number) {
861
862
863
864
865
866 if (cdev->config)
867 reset_config(cdev);
868 result = 0;
869 break;
870 }
871 }
872 if (result < 0)
873 goto done;
874 } else {
875 if (cdev->config)
876 reset_config(cdev);
877 result = 0;
878 }
879
880 DBG(cdev, "%s config #%d: %s\n",
881 usb_speed_string(gadget->speed),
882 number, c ? c->label : "unconfigured");
883
884 if (!c)
885 goto done;
886
887 usb_gadget_set_state(gadget, USB_STATE_CONFIGURED);
888 cdev->config = c;
889
890
891 for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) {
892 struct usb_function *f = c->interface[tmp];
893 struct usb_descriptor_header **descriptors;
894
895 if (!f)
896 break;
897
898
899
900
901
902
903
904 descriptors = function_descriptors(f, gadget->speed);
905
906 for (; *descriptors; ++descriptors) {
907 struct usb_endpoint_descriptor *ep;
908 int addr;
909
910 if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT)
911 continue;
912
913 ep = (struct usb_endpoint_descriptor *)*descriptors;
914 addr = ((ep->bEndpointAddress & 0x80) >> 3)
915 | (ep->bEndpointAddress & 0x0f);
916 set_bit(addr, f->endpoints);
917 }
918
919 result = f->set_alt(f, tmp, 0);
920 if (result < 0) {
921 DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n",
922 tmp, f->name, f, result);
923
924 reset_config(cdev);
925 goto done;
926 }
927
928 if (result == USB_GADGET_DELAYED_STATUS) {
929 DBG(cdev,
930 "%s: interface %d (%s) requested delayed status\n",
931 __func__, tmp, f->name);
932 cdev->delayed_status++;
933 DBG(cdev, "delayed_status count %d\n",
934 cdev->delayed_status);
935 }
936 }
937
938
939 if (c->MaxPower || (c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))
940 power = c->MaxPower;
941 else
942 power = CONFIG_USB_GADGET_VBUS_DRAW;
943
944 if (gadget->speed < USB_SPEED_SUPER)
945 power = min(power, 500U);
946 else
947 power = min(power, 900U);
948done:
949 if (power <= USB_SELF_POWER_VBUS_MAX_DRAW)
950 usb_gadget_set_selfpowered(gadget);
951 else
952 usb_gadget_clear_selfpowered(gadget);
953
954 usb_gadget_vbus_draw(gadget, power);
955 if (result >= 0 && cdev->delayed_status)
956 result = USB_GADGET_DELAYED_STATUS;
957 return result;
958}
959
960int usb_add_config_only(struct usb_composite_dev *cdev,
961 struct usb_configuration *config)
962{
963 struct usb_configuration *c;
964
965 if (!config->bConfigurationValue)
966 return -EINVAL;
967
968
969 list_for_each_entry(c, &cdev->configs, list) {
970 if (c->bConfigurationValue == config->bConfigurationValue)
971 return -EBUSY;
972 }
973
974 config->cdev = cdev;
975 list_add_tail(&config->list, &cdev->configs);
976
977 INIT_LIST_HEAD(&config->functions);
978 config->next_interface_id = 0;
979 memset(config->interface, 0, sizeof(config->interface));
980
981 return 0;
982}
983EXPORT_SYMBOL_GPL(usb_add_config_only);
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000int usb_add_config(struct usb_composite_dev *cdev,
1001 struct usb_configuration *config,
1002 int (*bind)(struct usb_configuration *))
1003{
1004 int status = -EINVAL;
1005
1006 if (!bind)
1007 goto done;
1008
1009 DBG(cdev, "adding config #%u '%s'/%p\n",
1010 config->bConfigurationValue,
1011 config->label, config);
1012
1013 status = usb_add_config_only(cdev, config);
1014 if (status)
1015 goto done;
1016
1017 status = bind(config);
1018 if (status < 0) {
1019 while (!list_empty(&config->functions)) {
1020 struct usb_function *f;
1021
1022 f = list_first_entry(&config->functions,
1023 struct usb_function, list);
1024 list_del(&f->list);
1025 if (f->unbind) {
1026 DBG(cdev, "unbind function '%s'/%p\n",
1027 f->name, f);
1028 f->unbind(config, f);
1029
1030 }
1031 }
1032 list_del(&config->list);
1033 config->cdev = NULL;
1034 } else {
1035 unsigned i;
1036
1037 DBG(cdev, "cfg %d/%p speeds:%s%s%s%s\n",
1038 config->bConfigurationValue, config,
1039 config->superspeed_plus ? " superplus" : "",
1040 config->superspeed ? " super" : "",
1041 config->highspeed ? " high" : "",
1042 config->fullspeed
1043 ? (gadget_is_dualspeed(cdev->gadget)
1044 ? " full"
1045 : " full/low")
1046 : "");
1047
1048 for (i = 0; i < MAX_CONFIG_INTERFACES; i++) {
1049 struct usb_function *f = config->interface[i];
1050
1051 if (!f)
1052 continue;
1053 DBG(cdev, " interface %d = %s/%p\n",
1054 i, f->name, f);
1055 }
1056 }
1057
1058
1059 usb_ep_autoconfig_reset(cdev->gadget);
1060
1061done:
1062 if (status)
1063 DBG(cdev, "added config '%s'/%u --> %d\n", config->label,
1064 config->bConfigurationValue, status);
1065 return status;
1066}
1067EXPORT_SYMBOL_GPL(usb_add_config);
1068
1069static void remove_config(struct usb_composite_dev *cdev,
1070 struct usb_configuration *config)
1071{
1072 while (!list_empty(&config->functions)) {
1073 struct usb_function *f;
1074
1075 f = list_first_entry(&config->functions,
1076 struct usb_function, list);
1077
1078 usb_remove_function(config, f);
1079 }
1080 list_del(&config->list);
1081 if (config->unbind) {
1082 DBG(cdev, "unbind config '%s'/%p\n", config->label, config);
1083 config->unbind(config);
1084
1085 }
1086}
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097void usb_remove_config(struct usb_composite_dev *cdev,
1098 struct usb_configuration *config)
1099{
1100 unsigned long flags;
1101
1102 spin_lock_irqsave(&cdev->lock, flags);
1103
1104 if (cdev->config == config)
1105 reset_config(cdev);
1106
1107 spin_unlock_irqrestore(&cdev->lock, flags);
1108
1109 remove_config(cdev, config);
1110}
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf)
1121{
1122 const struct usb_gadget_strings *s;
1123 __le16 language;
1124 __le16 *tmp;
1125
1126 while (*sp) {
1127 s = *sp;
1128 language = cpu_to_le16(s->language);
1129 for (tmp = buf; *tmp && tmp < &buf[USB_MAX_STRING_LEN]; tmp++) {
1130 if (*tmp == language)
1131 goto repeat;
1132 }
1133 *tmp++ = language;
1134repeat:
1135 sp++;
1136 }
1137}
1138
1139static int lookup_string(
1140 struct usb_gadget_strings **sp,
1141 void *buf,
1142 u16 language,
1143 int id
1144)
1145{
1146 struct usb_gadget_strings *s;
1147 int value;
1148
1149 while (*sp) {
1150 s = *sp++;
1151 if (s->language != language)
1152 continue;
1153 value = usb_gadget_get_string(s, id, buf);
1154 if (value > 0)
1155 return value;
1156 }
1157 return -EINVAL;
1158}
1159
1160static int get_string(struct usb_composite_dev *cdev,
1161 void *buf, u16 language, int id)
1162{
1163 struct usb_composite_driver *composite = cdev->driver;
1164 struct usb_gadget_string_container *uc;
1165 struct usb_configuration *c;
1166 struct usb_function *f;
1167 int len;
1168
1169
1170
1171
1172
1173
1174
1175 if (id == 0) {
1176 struct usb_string_descriptor *s = buf;
1177 struct usb_gadget_strings **sp;
1178
1179 memset(s, 0, 256);
1180 s->bDescriptorType = USB_DT_STRING;
1181
1182 sp = composite->strings;
1183 if (sp)
1184 collect_langs(sp, s->wData);
1185
1186 list_for_each_entry(c, &cdev->configs, list) {
1187 sp = c->strings;
1188 if (sp)
1189 collect_langs(sp, s->wData);
1190
1191 list_for_each_entry(f, &c->functions, list) {
1192 sp = f->strings;
1193 if (sp)
1194 collect_langs(sp, s->wData);
1195 }
1196 }
1197 list_for_each_entry(uc, &cdev->gstrings, list) {
1198 struct usb_gadget_strings **sp;
1199
1200 sp = get_containers_gs(uc);
1201 collect_langs(sp, s->wData);
1202 }
1203
1204 for (len = 0; len <= USB_MAX_STRING_LEN && s->wData[len]; len++)
1205 continue;
1206 if (!len)
1207 return -EINVAL;
1208
1209 s->bLength = 2 * (len + 1);
1210 return s->bLength;
1211 }
1212
1213 if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) {
1214 struct usb_os_string *b = buf;
1215 b->bLength = sizeof(*b);
1216 b->bDescriptorType = USB_DT_STRING;
1217 compiletime_assert(
1218 sizeof(b->qwSignature) == sizeof(cdev->qw_sign),
1219 "qwSignature size must be equal to qw_sign");
1220 memcpy(&b->qwSignature, cdev->qw_sign, sizeof(b->qwSignature));
1221 b->bMS_VendorCode = cdev->b_vendor_code;
1222 b->bPad = 0;
1223 return sizeof(*b);
1224 }
1225
1226 list_for_each_entry(uc, &cdev->gstrings, list) {
1227 struct usb_gadget_strings **sp;
1228
1229 sp = get_containers_gs(uc);
1230 len = lookup_string(sp, buf, language, id);
1231 if (len > 0)
1232 return len;
1233 }
1234
1235
1236
1237
1238
1239 if (composite->strings) {
1240 len = lookup_string(composite->strings, buf, language, id);
1241 if (len > 0)
1242 return len;
1243 }
1244 list_for_each_entry(c, &cdev->configs, list) {
1245 if (c->strings) {
1246 len = lookup_string(c->strings, buf, language, id);
1247 if (len > 0)
1248 return len;
1249 }
1250 list_for_each_entry(f, &c->functions, list) {
1251 if (!f->strings)
1252 continue;
1253 len = lookup_string(f->strings, buf, language, id);
1254 if (len > 0)
1255 return len;
1256 }
1257 }
1258 return -EINVAL;
1259}
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275int usb_string_id(struct usb_composite_dev *cdev)
1276{
1277 if (cdev->next_string_id < 254) {
1278
1279
1280
1281 cdev->next_string_id++;
1282 return cdev->next_string_id;
1283 }
1284 return -ENODEV;
1285}
1286EXPORT_SYMBOL_GPL(usb_string_id);
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
1305{
1306 int next = cdev->next_string_id;
1307
1308 for (; str->s; ++str) {
1309 if (unlikely(next >= 254))
1310 return -ENODEV;
1311 str->id = ++next;
1312 }
1313
1314 cdev->next_string_id = next;
1315
1316 return 0;
1317}
1318EXPORT_SYMBOL_GPL(usb_string_ids_tab);
1319
1320static struct usb_gadget_string_container *copy_gadget_strings(
1321 struct usb_gadget_strings **sp, unsigned n_gstrings,
1322 unsigned n_strings)
1323{
1324 struct usb_gadget_string_container *uc;
1325 struct usb_gadget_strings **gs_array;
1326 struct usb_gadget_strings *gs;
1327 struct usb_string *s;
1328 unsigned mem;
1329 unsigned n_gs;
1330 unsigned n_s;
1331 void *stash;
1332
1333 mem = sizeof(*uc);
1334 mem += sizeof(void *) * (n_gstrings + 1);
1335 mem += sizeof(struct usb_gadget_strings) * n_gstrings;
1336 mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings);
1337 uc = kmalloc(mem, GFP_KERNEL);
1338 if (!uc)
1339 return ERR_PTR(-ENOMEM);
1340 gs_array = get_containers_gs(uc);
1341 stash = uc->stash;
1342 stash += sizeof(void *) * (n_gstrings + 1);
1343 for (n_gs = 0; n_gs < n_gstrings; n_gs++) {
1344 struct usb_string *org_s;
1345
1346 gs_array[n_gs] = stash;
1347 gs = gs_array[n_gs];
1348 stash += sizeof(struct usb_gadget_strings);
1349 gs->language = sp[n_gs]->language;
1350 gs->strings = stash;
1351 org_s = sp[n_gs]->strings;
1352
1353 for (n_s = 0; n_s < n_strings; n_s++) {
1354 s = stash;
1355 stash += sizeof(struct usb_string);
1356 if (org_s->s)
1357 s->s = org_s->s;
1358 else
1359 s->s = "";
1360 org_s++;
1361 }
1362 s = stash;
1363 s->s = NULL;
1364 stash += sizeof(struct usb_string);
1365
1366 }
1367 gs_array[n_gs] = NULL;
1368 return uc;
1369}
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
1389 struct usb_gadget_strings **sp, unsigned n_strings)
1390{
1391 struct usb_gadget_string_container *uc;
1392 struct usb_gadget_strings **n_gs;
1393 unsigned n_gstrings = 0;
1394 unsigned i;
1395 int ret;
1396
1397 for (i = 0; sp[i]; i++)
1398 n_gstrings++;
1399
1400 if (!n_gstrings)
1401 return ERR_PTR(-EINVAL);
1402
1403 uc = copy_gadget_strings(sp, n_gstrings, n_strings);
1404 if (IS_ERR(uc))
1405 return ERR_CAST(uc);
1406
1407 n_gs = get_containers_gs(uc);
1408 ret = usb_string_ids_tab(cdev, n_gs[0]->strings);
1409 if (ret)
1410 goto err;
1411
1412 for (i = 1; i < n_gstrings; i++) {
1413 struct usb_string *m_s;
1414 struct usb_string *s;
1415 unsigned n;
1416
1417 m_s = n_gs[0]->strings;
1418 s = n_gs[i]->strings;
1419 for (n = 0; n < n_strings; n++) {
1420 s->id = m_s->id;
1421 s++;
1422 m_s++;
1423 }
1424 }
1425 list_add_tail(&uc->list, &cdev->gstrings);
1426 return n_gs[0]->strings;
1427err:
1428 kfree(uc);
1429 return ERR_PTR(ret);
1430}
1431EXPORT_SYMBOL_GPL(usb_gstrings_attach);
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452int usb_string_ids_n(struct usb_composite_dev *c, unsigned n)
1453{
1454 unsigned next = c->next_string_id;
1455 if (unlikely(n > 254 || (unsigned)next + n > 254))
1456 return -ENODEV;
1457 c->next_string_id += n;
1458 return next + 1;
1459}
1460EXPORT_SYMBOL_GPL(usb_string_ids_n);
1461
1462
1463
1464static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
1465{
1466 struct usb_composite_dev *cdev;
1467
1468 if (req->status || req->actual != req->length)
1469 DBG((struct usb_composite_dev *) ep->driver_data,
1470 "setup complete --> %d, %d/%d\n",
1471 req->status, req->actual, req->length);
1472
1473
1474
1475
1476
1477
1478
1479
1480 if (!req->context)
1481 return;
1482
1483 cdev = req->context;
1484
1485 if (cdev->req == req)
1486 cdev->setup_pending = false;
1487 else if (cdev->os_desc_req == req)
1488 cdev->os_desc_pending = false;
1489 else
1490 WARN(1, "unknown request %p\n", req);
1491}
1492
1493static int composite_ep0_queue(struct usb_composite_dev *cdev,
1494 struct usb_request *req, gfp_t gfp_flags)
1495{
1496 int ret;
1497
1498 ret = usb_ep_queue(cdev->gadget->ep0, req, gfp_flags);
1499 if (ret == 0) {
1500 if (cdev->req == req)
1501 cdev->setup_pending = true;
1502 else if (cdev->os_desc_req == req)
1503 cdev->os_desc_pending = true;
1504 else
1505 WARN(1, "unknown request %p\n", req);
1506 }
1507
1508 return ret;
1509}
1510
1511static int count_ext_compat(struct usb_configuration *c)
1512{
1513 int i, res;
1514
1515 res = 0;
1516 for (i = 0; i < c->next_interface_id; ++i) {
1517 struct usb_function *f;
1518 int j;
1519
1520 f = c->interface[i];
1521 for (j = 0; j < f->os_desc_n; ++j) {
1522 struct usb_os_desc *d;
1523
1524 if (i != f->os_desc_table[j].if_id)
1525 continue;
1526 d = f->os_desc_table[j].os_desc;
1527 if (d && d->ext_compat_id)
1528 ++res;
1529 }
1530 }
1531 BUG_ON(res > 255);
1532 return res;
1533}
1534
1535static int fill_ext_compat(struct usb_configuration *c, u8 *buf)
1536{
1537 int i, count;
1538
1539 count = 16;
1540 buf += 16;
1541 for (i = 0; i < c->next_interface_id; ++i) {
1542 struct usb_function *f;
1543 int j;
1544
1545 f = c->interface[i];
1546 for (j = 0; j < f->os_desc_n; ++j) {
1547 struct usb_os_desc *d;
1548
1549 if (i != f->os_desc_table[j].if_id)
1550 continue;
1551 d = f->os_desc_table[j].os_desc;
1552 if (d && d->ext_compat_id) {
1553 *buf++ = i;
1554 *buf++ = 0x01;
1555 memcpy(buf, d->ext_compat_id, 16);
1556 buf += 22;
1557 } else {
1558 ++buf;
1559 *buf = 0x01;
1560 buf += 23;
1561 }
1562 count += 24;
1563 if (count + 24 >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1564 return count;
1565 }
1566 }
1567
1568 return count;
1569}
1570
1571static int count_ext_prop(struct usb_configuration *c, int interface)
1572{
1573 struct usb_function *f;
1574 int j;
1575
1576 f = c->interface[interface];
1577 for (j = 0; j < f->os_desc_n; ++j) {
1578 struct usb_os_desc *d;
1579
1580 if (interface != f->os_desc_table[j].if_id)
1581 continue;
1582 d = f->os_desc_table[j].os_desc;
1583 if (d && d->ext_compat_id)
1584 return d->ext_prop_count;
1585 }
1586 return 0;
1587}
1588
1589static int len_ext_prop(struct usb_configuration *c, int interface)
1590{
1591 struct usb_function *f;
1592 struct usb_os_desc *d;
1593 int j, res;
1594
1595 res = 10;
1596 f = c->interface[interface];
1597 for (j = 0; j < f->os_desc_n; ++j) {
1598 if (interface != f->os_desc_table[j].if_id)
1599 continue;
1600 d = f->os_desc_table[j].os_desc;
1601 if (d)
1602 return min(res + d->ext_prop_len, 4096);
1603 }
1604 return res;
1605}
1606
1607static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
1608{
1609 struct usb_function *f;
1610 struct usb_os_desc *d;
1611 struct usb_os_desc_ext_prop *ext_prop;
1612 int j, count, n, ret;
1613
1614 f = c->interface[interface];
1615 count = 10;
1616 buf += 10;
1617 for (j = 0; j < f->os_desc_n; ++j) {
1618 if (interface != f->os_desc_table[j].if_id)
1619 continue;
1620 d = f->os_desc_table[j].os_desc;
1621 if (d)
1622 list_for_each_entry(ext_prop, &d->ext_prop, entry) {
1623 n = ext_prop->data_len +
1624 ext_prop->name_len + 14;
1625 if (count + n >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1626 return count;
1627 usb_ext_prop_put_size(buf, n);
1628 usb_ext_prop_put_type(buf, ext_prop->type);
1629 ret = usb_ext_prop_put_name(buf, ext_prop->name,
1630 ext_prop->name_len);
1631 if (ret < 0)
1632 return ret;
1633 switch (ext_prop->type) {
1634 case USB_EXT_PROP_UNICODE:
1635 case USB_EXT_PROP_UNICODE_ENV:
1636 case USB_EXT_PROP_UNICODE_LINK:
1637 usb_ext_prop_put_unicode(buf, ret,
1638 ext_prop->data,
1639 ext_prop->data_len);
1640 break;
1641 case USB_EXT_PROP_BINARY:
1642 usb_ext_prop_put_binary(buf, ret,
1643 ext_prop->data,
1644 ext_prop->data_len);
1645 break;
1646 case USB_EXT_PROP_LE32:
1647
1648 case USB_EXT_PROP_BE32:
1649
1650 default:
1651 return -EINVAL;
1652 }
1653 buf += n;
1654 count += n;
1655 }
1656 }
1657
1658 return count;
1659}
1660
1661
1662
1663
1664
1665
1666
1667
1668int
1669composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1670{
1671 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1672 struct usb_request *req = cdev->req;
1673 int value = -EOPNOTSUPP;
1674 int status = 0;
1675 u16 w_index = le16_to_cpu(ctrl->wIndex);
1676 u8 intf = w_index & 0xFF;
1677 u16 w_value = le16_to_cpu(ctrl->wValue);
1678 u16 w_length = le16_to_cpu(ctrl->wLength);
1679 struct usb_function *f = NULL;
1680 u8 endp;
1681
1682
1683
1684
1685
1686 req->zero = 0;
1687 req->context = cdev;
1688 req->complete = composite_setup_complete;
1689 req->length = 0;
1690 gadget->ep0->driver_data = cdev;
1691
1692
1693
1694
1695
1696 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
1697 goto unknown;
1698
1699 switch (ctrl->bRequest) {
1700
1701
1702 case USB_REQ_GET_DESCRIPTOR:
1703 if (ctrl->bRequestType != USB_DIR_IN)
1704 goto unknown;
1705 switch (w_value >> 8) {
1706
1707 case USB_DT_DEVICE:
1708 cdev->desc.bNumConfigurations =
1709 count_configs(cdev, USB_DT_DEVICE);
1710 cdev->desc.bMaxPacketSize0 =
1711 cdev->gadget->ep0->maxpacket;
1712 if (gadget_is_superspeed(gadget)) {
1713 if (gadget->speed >= USB_SPEED_SUPER) {
1714 cdev->desc.bcdUSB = cpu_to_le16(0x0320);
1715 cdev->desc.bMaxPacketSize0 = 9;
1716 } else {
1717 cdev->desc.bcdUSB = cpu_to_le16(0x0210);
1718 }
1719 } else {
1720 if (gadget->lpm_capable)
1721 cdev->desc.bcdUSB = cpu_to_le16(0x0201);
1722 else
1723 cdev->desc.bcdUSB = cpu_to_le16(0x0200);
1724 }
1725
1726 value = min(w_length, (u16) sizeof cdev->desc);
1727 memcpy(req->buf, &cdev->desc, value);
1728 break;
1729 case USB_DT_DEVICE_QUALIFIER:
1730 if (!gadget_is_dualspeed(gadget) ||
1731 gadget->speed >= USB_SPEED_SUPER)
1732 break;
1733 device_qual(cdev);
1734 value = min_t(int, w_length,
1735 sizeof(struct usb_qualifier_descriptor));
1736 break;
1737 case USB_DT_OTHER_SPEED_CONFIG:
1738 if (!gadget_is_dualspeed(gadget) ||
1739 gadget->speed >= USB_SPEED_SUPER)
1740 break;
1741 fallthrough;
1742 case USB_DT_CONFIG:
1743 value = config_desc(cdev, w_value);
1744 if (value >= 0)
1745 value = min(w_length, (u16) value);
1746 break;
1747 case USB_DT_STRING:
1748 value = get_string(cdev, req->buf,
1749 w_index, w_value & 0xff);
1750 if (value >= 0)
1751 value = min(w_length, (u16) value);
1752 break;
1753 case USB_DT_BOS:
1754 if (gadget_is_superspeed(gadget) ||
1755 gadget->lpm_capable) {
1756 value = bos_desc(cdev);
1757 value = min(w_length, (u16) value);
1758 }
1759 break;
1760 case USB_DT_OTG:
1761 if (gadget_is_otg(gadget)) {
1762 struct usb_configuration *config;
1763 int otg_desc_len = 0;
1764
1765 if (cdev->config)
1766 config = cdev->config;
1767 else
1768 config = list_first_entry(
1769 &cdev->configs,
1770 struct usb_configuration, list);
1771 if (!config)
1772 goto done;
1773
1774 if (gadget->otg_caps &&
1775 (gadget->otg_caps->otg_rev >= 0x0200))
1776 otg_desc_len += sizeof(
1777 struct usb_otg20_descriptor);
1778 else
1779 otg_desc_len += sizeof(
1780 struct usb_otg_descriptor);
1781
1782 value = min_t(int, w_length, otg_desc_len);
1783 memcpy(req->buf, config->descriptors[0], value);
1784 }
1785 break;
1786 }
1787 break;
1788
1789
1790 case USB_REQ_SET_CONFIGURATION:
1791 if (ctrl->bRequestType != 0)
1792 goto unknown;
1793 if (gadget_is_otg(gadget)) {
1794 if (gadget->a_hnp_support)
1795 DBG(cdev, "HNP available\n");
1796 else if (gadget->a_alt_hnp_support)
1797 DBG(cdev, "HNP on another port\n");
1798 else
1799 VDBG(cdev, "HNP inactive\n");
1800 }
1801 spin_lock(&cdev->lock);
1802 value = set_config(cdev, ctrl, w_value);
1803 spin_unlock(&cdev->lock);
1804 break;
1805 case USB_REQ_GET_CONFIGURATION:
1806 if (ctrl->bRequestType != USB_DIR_IN)
1807 goto unknown;
1808 if (cdev->config)
1809 *(u8 *)req->buf = cdev->config->bConfigurationValue;
1810 else
1811 *(u8 *)req->buf = 0;
1812 value = min(w_length, (u16) 1);
1813 break;
1814
1815
1816 case USB_REQ_SET_INTERFACE:
1817 if (ctrl->bRequestType != USB_RECIP_INTERFACE)
1818 goto unknown;
1819 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1820 break;
1821 f = cdev->config->interface[intf];
1822 if (!f)
1823 break;
1824
1825
1826
1827
1828
1829
1830 if (w_value && !f->get_alt)
1831 break;
1832
1833 spin_lock(&cdev->lock);
1834 value = f->set_alt(f, w_index, w_value);
1835 if (value == USB_GADGET_DELAYED_STATUS) {
1836 DBG(cdev,
1837 "%s: interface %d (%s) requested delayed status\n",
1838 __func__, intf, f->name);
1839 cdev->delayed_status++;
1840 DBG(cdev, "delayed_status count %d\n",
1841 cdev->delayed_status);
1842 }
1843 spin_unlock(&cdev->lock);
1844 break;
1845 case USB_REQ_GET_INTERFACE:
1846 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
1847 goto unknown;
1848 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1849 break;
1850 f = cdev->config->interface[intf];
1851 if (!f)
1852 break;
1853
1854 value = f->get_alt ? f->get_alt(f, w_index) : 0;
1855 if (value < 0)
1856 break;
1857 *((u8 *)req->buf) = value;
1858 value = min(w_length, (u16) 1);
1859 break;
1860 case USB_REQ_GET_STATUS:
1861 if (gadget_is_otg(gadget) && gadget->hnp_polling_support &&
1862 (w_index == OTG_STS_SELECTOR)) {
1863 if (ctrl->bRequestType != (USB_DIR_IN |
1864 USB_RECIP_DEVICE))
1865 goto unknown;
1866 *((u8 *)req->buf) = gadget->host_request_flag;
1867 value = 1;
1868 break;
1869 }
1870
1871
1872
1873
1874
1875
1876
1877
1878 if (!gadget_is_superspeed(gadget))
1879 goto unknown;
1880 if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
1881 goto unknown;
1882 value = 2;
1883 put_unaligned_le16(0, req->buf);
1884 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1885 break;
1886 f = cdev->config->interface[intf];
1887 if (!f)
1888 break;
1889 status = f->get_status ? f->get_status(f) : 0;
1890 if (status < 0)
1891 break;
1892 put_unaligned_le16(status & 0x0000ffff, req->buf);
1893 break;
1894
1895
1896
1897
1898
1899 case USB_REQ_CLEAR_FEATURE:
1900 case USB_REQ_SET_FEATURE:
1901 if (!gadget_is_superspeed(gadget))
1902 goto unknown;
1903 if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE))
1904 goto unknown;
1905 switch (w_value) {
1906 case USB_INTRF_FUNC_SUSPEND:
1907 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1908 break;
1909 f = cdev->config->interface[intf];
1910 if (!f)
1911 break;
1912 value = 0;
1913 if (f->func_suspend)
1914 value = f->func_suspend(f, w_index >> 8);
1915 if (value < 0) {
1916 ERROR(cdev,
1917 "func_suspend() returned error %d\n",
1918 value);
1919 value = 0;
1920 }
1921 break;
1922 }
1923 break;
1924 default:
1925unknown:
1926
1927
1928
1929 if (cdev->use_os_string && cdev->os_desc_config &&
1930 (ctrl->bRequestType & USB_TYPE_VENDOR) &&
1931 ctrl->bRequest == cdev->b_vendor_code) {
1932 struct usb_configuration *os_desc_cfg;
1933 u8 *buf;
1934 int interface;
1935 int count = 0;
1936
1937 req = cdev->os_desc_req;
1938 req->context = cdev;
1939 req->complete = composite_setup_complete;
1940 buf = req->buf;
1941 os_desc_cfg = cdev->os_desc_config;
1942 w_length = min_t(u16, w_length, USB_COMP_EP0_OS_DESC_BUFSIZ);
1943 memset(buf, 0, w_length);
1944 buf[5] = 0x01;
1945 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1946 case USB_RECIP_DEVICE:
1947 if (w_index != 0x4 || (w_value >> 8))
1948 break;
1949 buf[6] = w_index;
1950
1951 count = count_ext_compat(os_desc_cfg);
1952 buf[8] = count;
1953 count *= 24;
1954 count += 16;
1955 put_unaligned_le32(count, buf);
1956 value = w_length;
1957 if (w_length > 0x10) {
1958 value = fill_ext_compat(os_desc_cfg, buf);
1959 value = min_t(u16, w_length, value);
1960 }
1961 break;
1962 case USB_RECIP_INTERFACE:
1963 if (w_index != 0x5 || (w_value >> 8))
1964 break;
1965 interface = w_value & 0xFF;
1966 buf[6] = w_index;
1967 count = count_ext_prop(os_desc_cfg,
1968 interface);
1969 put_unaligned_le16(count, buf + 8);
1970 count = len_ext_prop(os_desc_cfg,
1971 interface);
1972 put_unaligned_le32(count, buf);
1973 value = w_length;
1974 if (w_length > 0x0A) {
1975 value = fill_ext_prop(os_desc_cfg,
1976 interface, buf);
1977 if (value >= 0)
1978 value = min_t(u16, w_length, value);
1979 }
1980 break;
1981 }
1982
1983 goto check_value;
1984 }
1985
1986 VDBG(cdev,
1987 "non-core control req%02x.%02x v%04x i%04x l%d\n",
1988 ctrl->bRequestType, ctrl->bRequest,
1989 w_value, w_index, w_length);
1990
1991
1992
1993
1994
1995 if (cdev->config) {
1996 list_for_each_entry(f, &cdev->config->functions, list)
1997 if (f->req_match &&
1998 f->req_match(f, ctrl, false))
1999 goto try_fun_setup;
2000 } else {
2001 struct usb_configuration *c;
2002 list_for_each_entry(c, &cdev->configs, list)
2003 list_for_each_entry(f, &c->functions, list)
2004 if (f->req_match &&
2005 f->req_match(f, ctrl, true))
2006 goto try_fun_setup;
2007 }
2008 f = NULL;
2009
2010 switch (ctrl->bRequestType & USB_RECIP_MASK) {
2011 case USB_RECIP_INTERFACE:
2012 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
2013 break;
2014 f = cdev->config->interface[intf];
2015 break;
2016
2017 case USB_RECIP_ENDPOINT:
2018 if (!cdev->config)
2019 break;
2020 endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f);
2021 list_for_each_entry(f, &cdev->config->functions, list) {
2022 if (test_bit(endp, f->endpoints))
2023 break;
2024 }
2025 if (&f->list == &cdev->config->functions)
2026 f = NULL;
2027 break;
2028 }
2029try_fun_setup:
2030 if (f && f->setup)
2031 value = f->setup(f, ctrl);
2032 else {
2033 struct usb_configuration *c;
2034
2035 c = cdev->config;
2036 if (!c)
2037 goto done;
2038
2039
2040 if (c->setup) {
2041 value = c->setup(c, ctrl);
2042 goto done;
2043 }
2044
2045
2046 if (!list_is_singular(&c->functions))
2047 goto done;
2048 f = list_first_entry(&c->functions, struct usb_function,
2049 list);
2050 if (f->setup)
2051 value = f->setup(f, ctrl);
2052 }
2053
2054 goto done;
2055 }
2056
2057check_value:
2058
2059 if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) {
2060 req->length = value;
2061 req->context = cdev;
2062 req->zero = value < w_length;
2063 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2064 if (value < 0) {
2065 DBG(cdev, "ep_queue --> %d\n", value);
2066 req->status = 0;
2067 composite_setup_complete(gadget->ep0, req);
2068 }
2069 } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) {
2070 WARN(cdev,
2071 "%s: Delayed status not supported for w_length != 0",
2072 __func__);
2073 }
2074
2075done:
2076
2077 return value;
2078}
2079
2080static void __composite_disconnect(struct usb_gadget *gadget)
2081{
2082 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2083 unsigned long flags;
2084
2085
2086
2087
2088 spin_lock_irqsave(&cdev->lock, flags);
2089 cdev->suspended = 0;
2090 if (cdev->config)
2091 reset_config(cdev);
2092 if (cdev->driver->disconnect)
2093 cdev->driver->disconnect(cdev);
2094 spin_unlock_irqrestore(&cdev->lock, flags);
2095}
2096
2097void composite_disconnect(struct usb_gadget *gadget)
2098{
2099 usb_gadget_vbus_draw(gadget, 0);
2100 __composite_disconnect(gadget);
2101}
2102
2103void composite_reset(struct usb_gadget *gadget)
2104{
2105
2106
2107
2108
2109
2110 usb_gadget_vbus_draw(gadget, 100);
2111 __composite_disconnect(gadget);
2112}
2113
2114
2115
2116static ssize_t suspended_show(struct device *dev, struct device_attribute *attr,
2117 char *buf)
2118{
2119 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
2120 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2121
2122 return sprintf(buf, "%d\n", cdev->suspended);
2123}
2124static DEVICE_ATTR_RO(suspended);
2125
2126static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
2127{
2128 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2129 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2130 struct usb_string *dev_str = gstr->strings;
2131
2132
2133
2134
2135
2136
2137 WARN_ON(cdev->config);
2138
2139 while (!list_empty(&cdev->configs)) {
2140 struct usb_configuration *c;
2141 c = list_first_entry(&cdev->configs,
2142 struct usb_configuration, list);
2143 remove_config(cdev, c);
2144 }
2145 if (cdev->driver->unbind && unbind_driver)
2146 cdev->driver->unbind(cdev);
2147
2148 composite_dev_cleanup(cdev);
2149
2150 if (dev_str[USB_GADGET_MANUFACTURER_IDX].s == cdev->def_manufacturer)
2151 dev_str[USB_GADGET_MANUFACTURER_IDX].s = "";
2152
2153 kfree(cdev->def_manufacturer);
2154 kfree(cdev);
2155 set_gadget_data(gadget, NULL);
2156}
2157
2158static void composite_unbind(struct usb_gadget *gadget)
2159{
2160 __composite_unbind(gadget, true);
2161}
2162
2163static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
2164 const struct usb_device_descriptor *old)
2165{
2166 __le16 idVendor;
2167 __le16 idProduct;
2168 __le16 bcdDevice;
2169 u8 iSerialNumber;
2170 u8 iManufacturer;
2171 u8 iProduct;
2172
2173
2174
2175
2176
2177 idVendor = new->idVendor;
2178 idProduct = new->idProduct;
2179 bcdDevice = new->bcdDevice;
2180 iSerialNumber = new->iSerialNumber;
2181 iManufacturer = new->iManufacturer;
2182 iProduct = new->iProduct;
2183
2184 *new = *old;
2185 if (idVendor)
2186 new->idVendor = idVendor;
2187 if (idProduct)
2188 new->idProduct = idProduct;
2189 if (bcdDevice)
2190 new->bcdDevice = bcdDevice;
2191 else
2192 new->bcdDevice = cpu_to_le16(get_default_bcdDevice());
2193 if (iSerialNumber)
2194 new->iSerialNumber = iSerialNumber;
2195 if (iManufacturer)
2196 new->iManufacturer = iManufacturer;
2197 if (iProduct)
2198 new->iProduct = iProduct;
2199}
2200
2201int composite_dev_prepare(struct usb_composite_driver *composite,
2202 struct usb_composite_dev *cdev)
2203{
2204 struct usb_gadget *gadget = cdev->gadget;
2205 int ret = -ENOMEM;
2206
2207
2208 cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
2209 if (!cdev->req)
2210 return -ENOMEM;
2211
2212 cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
2213 if (!cdev->req->buf)
2214 goto fail;
2215
2216 ret = device_create_file(&gadget->dev, &dev_attr_suspended);
2217 if (ret)
2218 goto fail_dev;
2219
2220 cdev->req->complete = composite_setup_complete;
2221 cdev->req->context = cdev;
2222 gadget->ep0->driver_data = cdev;
2223
2224 cdev->driver = composite;
2225
2226
2227
2228
2229
2230
2231 if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW)
2232 usb_gadget_set_selfpowered(gadget);
2233
2234
2235
2236
2237
2238 usb_ep_autoconfig_reset(gadget);
2239 return 0;
2240fail_dev:
2241 kfree(cdev->req->buf);
2242fail:
2243 usb_ep_free_request(gadget->ep0, cdev->req);
2244 cdev->req = NULL;
2245 return ret;
2246}
2247
2248int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
2249 struct usb_ep *ep0)
2250{
2251 int ret = 0;
2252
2253 cdev->os_desc_req = usb_ep_alloc_request(ep0, GFP_KERNEL);
2254 if (!cdev->os_desc_req) {
2255 ret = -ENOMEM;
2256 goto end;
2257 }
2258
2259 cdev->os_desc_req->buf = kmalloc(USB_COMP_EP0_OS_DESC_BUFSIZ,
2260 GFP_KERNEL);
2261 if (!cdev->os_desc_req->buf) {
2262 ret = -ENOMEM;
2263 usb_ep_free_request(ep0, cdev->os_desc_req);
2264 goto end;
2265 }
2266 cdev->os_desc_req->context = cdev;
2267 cdev->os_desc_req->complete = composite_setup_complete;
2268end:
2269 return ret;
2270}
2271
2272void composite_dev_cleanup(struct usb_composite_dev *cdev)
2273{
2274 struct usb_gadget_string_container *uc, *tmp;
2275 struct usb_ep *ep, *tmp_ep;
2276
2277 list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
2278 list_del(&uc->list);
2279 kfree(uc);
2280 }
2281 if (cdev->os_desc_req) {
2282 if (cdev->os_desc_pending)
2283 usb_ep_dequeue(cdev->gadget->ep0, cdev->os_desc_req);
2284
2285 kfree(cdev->os_desc_req->buf);
2286 cdev->os_desc_req->buf = NULL;
2287 usb_ep_free_request(cdev->gadget->ep0, cdev->os_desc_req);
2288 cdev->os_desc_req = NULL;
2289 }
2290 if (cdev->req) {
2291 if (cdev->setup_pending)
2292 usb_ep_dequeue(cdev->gadget->ep0, cdev->req);
2293
2294 kfree(cdev->req->buf);
2295 cdev->req->buf = NULL;
2296 usb_ep_free_request(cdev->gadget->ep0, cdev->req);
2297 cdev->req = NULL;
2298 }
2299 cdev->next_string_id = 0;
2300 device_remove_file(&cdev->gadget->dev, &dev_attr_suspended);
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311 list_for_each_entry_safe(ep, tmp_ep,
2312 &cdev->gadget->ep_list, ep_list) {
2313 if (ep->ops->dispose)
2314 ep->ops->dispose(ep);
2315 }
2316}
2317
2318static int composite_bind(struct usb_gadget *gadget,
2319 struct usb_gadget_driver *gdriver)
2320{
2321 struct usb_composite_dev *cdev;
2322 struct usb_composite_driver *composite = to_cdriver(gdriver);
2323 int status = -ENOMEM;
2324
2325 cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
2326 if (!cdev)
2327 return status;
2328
2329 spin_lock_init(&cdev->lock);
2330 cdev->gadget = gadget;
2331 set_gadget_data(gadget, cdev);
2332 INIT_LIST_HEAD(&cdev->configs);
2333 INIT_LIST_HEAD(&cdev->gstrings);
2334
2335 status = composite_dev_prepare(composite, cdev);
2336 if (status)
2337 goto fail;
2338
2339
2340
2341
2342
2343 status = composite->bind(cdev);
2344 if (status < 0)
2345 goto fail;
2346
2347 if (cdev->use_os_string) {
2348 status = composite_os_desc_req_prepare(cdev, gadget->ep0);
2349 if (status)
2350 goto fail;
2351 }
2352
2353 update_unchanged_dev_desc(&cdev->desc, composite->dev);
2354
2355
2356 if (composite->needs_serial && !cdev->desc.iSerialNumber)
2357 WARNING(cdev, "userspace failed to provide iSerialNumber\n");
2358
2359 INFO(cdev, "%s ready\n", composite->name);
2360 return 0;
2361
2362fail:
2363 __composite_unbind(gadget, false);
2364 return status;
2365}
2366
2367
2368
2369void composite_suspend(struct usb_gadget *gadget)
2370{
2371 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2372 struct usb_function *f;
2373
2374
2375
2376
2377 DBG(cdev, "suspend\n");
2378 if (cdev->config) {
2379 list_for_each_entry(f, &cdev->config->functions, list) {
2380 if (f->suspend)
2381 f->suspend(f);
2382 }
2383 }
2384 if (cdev->driver->suspend)
2385 cdev->driver->suspend(cdev);
2386
2387 cdev->suspended = 1;
2388
2389 usb_gadget_set_selfpowered(gadget);
2390 usb_gadget_vbus_draw(gadget, 2);
2391}
2392
2393void composite_resume(struct usb_gadget *gadget)
2394{
2395 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2396 struct usb_function *f;
2397 unsigned maxpower;
2398
2399
2400
2401
2402 DBG(cdev, "resume\n");
2403 if (cdev->driver->resume)
2404 cdev->driver->resume(cdev);
2405 if (cdev->config) {
2406 list_for_each_entry(f, &cdev->config->functions, list) {
2407 if (f->resume)
2408 f->resume(f);
2409 }
2410
2411 maxpower = cdev->config->MaxPower ?
2412 cdev->config->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
2413 if (gadget->speed < USB_SPEED_SUPER)
2414 maxpower = min(maxpower, 500U);
2415 else
2416 maxpower = min(maxpower, 900U);
2417
2418 if (maxpower > USB_SELF_POWER_VBUS_MAX_DRAW)
2419 usb_gadget_clear_selfpowered(gadget);
2420
2421 usb_gadget_vbus_draw(gadget, maxpower);
2422 }
2423
2424 cdev->suspended = 0;
2425}
2426
2427
2428
2429static const struct usb_gadget_driver composite_driver_template = {
2430 .bind = composite_bind,
2431 .unbind = composite_unbind,
2432
2433 .setup = composite_setup,
2434 .reset = composite_reset,
2435 .disconnect = composite_disconnect,
2436
2437 .suspend = composite_suspend,
2438 .resume = composite_resume,
2439
2440 .driver = {
2441 .owner = THIS_MODULE,
2442 },
2443};
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461int usb_composite_probe(struct usb_composite_driver *driver)
2462{
2463 struct usb_gadget_driver *gadget_driver;
2464
2465 if (!driver || !driver->dev || !driver->bind)
2466 return -EINVAL;
2467
2468 if (!driver->name)
2469 driver->name = "composite";
2470
2471 driver->gadget_driver = composite_driver_template;
2472 gadget_driver = &driver->gadget_driver;
2473
2474 gadget_driver->function = (char *) driver->name;
2475 gadget_driver->driver.name = driver->name;
2476 gadget_driver->max_speed = driver->max_speed;
2477
2478 return usb_gadget_probe_driver(gadget_driver);
2479}
2480EXPORT_SYMBOL_GPL(usb_composite_probe);
2481
2482
2483
2484
2485
2486
2487
2488
2489void usb_composite_unregister(struct usb_composite_driver *driver)
2490{
2491 usb_gadget_unregister_driver(&driver->gadget_driver);
2492}
2493EXPORT_SYMBOL_GPL(usb_composite_unregister);
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505void usb_composite_setup_continue(struct usb_composite_dev *cdev)
2506{
2507 int value;
2508 struct usb_request *req = cdev->req;
2509 unsigned long flags;
2510
2511 DBG(cdev, "%s\n", __func__);
2512 spin_lock_irqsave(&cdev->lock, flags);
2513
2514 if (cdev->delayed_status == 0) {
2515 WARN(cdev, "%s: Unexpected call\n", __func__);
2516
2517 } else if (--cdev->delayed_status == 0) {
2518 DBG(cdev, "%s: Completing delayed status\n", __func__);
2519 req->length = 0;
2520 req->context = cdev;
2521 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2522 if (value < 0) {
2523 DBG(cdev, "ep_queue --> %d\n", value);
2524 req->status = 0;
2525 composite_setup_complete(cdev->gadget->ep0, req);
2526 }
2527 }
2528
2529 spin_unlock_irqrestore(&cdev->lock, flags);
2530}
2531EXPORT_SYMBOL_GPL(usb_composite_setup_continue);
2532
2533static char *composite_default_mfr(struct usb_gadget *gadget)
2534{
2535 return kasprintf(GFP_KERNEL, "%s %s with %s", init_utsname()->sysname,
2536 init_utsname()->release, gadget->name);
2537}
2538
2539void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
2540 struct usb_composite_overwrite *covr)
2541{
2542 struct usb_device_descriptor *desc = &cdev->desc;
2543 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2544 struct usb_string *dev_str = gstr->strings;
2545
2546 if (covr->idVendor)
2547 desc->idVendor = cpu_to_le16(covr->idVendor);
2548
2549 if (covr->idProduct)
2550 desc->idProduct = cpu_to_le16(covr->idProduct);
2551
2552 if (covr->bcdDevice)
2553 desc->bcdDevice = cpu_to_le16(covr->bcdDevice);
2554
2555 if (covr->serial_number) {
2556 desc->iSerialNumber = dev_str[USB_GADGET_SERIAL_IDX].id;
2557 dev_str[USB_GADGET_SERIAL_IDX].s = covr->serial_number;
2558 }
2559 if (covr->manufacturer) {
2560 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2561 dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer;
2562
2563 } else if (!strlen(dev_str[USB_GADGET_MANUFACTURER_IDX].s)) {
2564 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2565 cdev->def_manufacturer = composite_default_mfr(cdev->gadget);
2566 dev_str[USB_GADGET_MANUFACTURER_IDX].s = cdev->def_manufacturer;
2567 }
2568
2569 if (covr->product) {
2570 desc->iProduct = dev_str[USB_GADGET_PRODUCT_IDX].id;
2571 dev_str[USB_GADGET_PRODUCT_IDX].s = covr->product;
2572 }
2573}
2574EXPORT_SYMBOL_GPL(usb_composite_overwrite_options);
2575
2576MODULE_LICENSE("GPL");
2577MODULE_AUTHOR("David Brownell");
2578