1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * composite.c - infrastructure for Composite USB Gadgets
4 *
5 * Copyright (C) 2006-2008 David Brownell
6 */
7
8 /* #define VERBOSE_DEBUG */
9
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 * struct usb_os_string - represents OS String to be reported by a gadget
26 * @bLength: total length of the entire descritor, always 0x12
27 * @bDescriptorType: USB_DT_STRING
28 * @qwSignature: the OS String proper
29 * @bMS_VendorCode: code used by the host for subsequent requests
30 * @bPad: not used, must be zero
31 */
32 struct 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 * The code in this file is utility code, used to build a gadget driver
42 * from one or more "function" drivers, one or more "configuration"
43 * objects, and a "usb_composite_driver" by gluing them together along
44 * with the relevant device-wide data.
45 */
46
get_containers_gs(struct usb_gadget_string_container * uc)47 static 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 * function_descriptors() - get function descriptors for speed
55 * @f: the function
56 * @speed: the speed
57 *
58 * Returns the descriptors or NULL if not set.
59 */
60 static struct usb_descriptor_header **
function_descriptors(struct usb_function * f,enum usb_device_speed speed)61 function_descriptors(struct usb_function *f,
62 enum usb_device_speed speed)
63 {
64 struct usb_descriptor_header **descriptors;
65
66 /*
67 * NOTE: we try to help gadget drivers which might not be setting
68 * max_speed appropriately.
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 * if we can't find any descriptors at all, then this gadget deserves to
93 * Oops with a NULL pointer dereference
94 */
95
96 return descriptors;
97 }
98
99 /**
100 * next_desc() - advance to the next desc_type descriptor
101 * @t: currect pointer within descriptor array
102 * @desc_type: descriptor type
103 *
104 * Return: next desc_type descriptor or NULL
105 *
106 * Iterate over @t until either desc_type descriptor found or
107 * NULL (that indicates end of list) encountered
108 */
109 static struct usb_descriptor_header**
next_desc(struct usb_descriptor_header ** t,u8 desc_type)110 next_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 * for_each_desc() - iterate over desc_type descriptors in the
121 * descriptors list
122 * @start: pointer within descriptor array.
123 * @iter_desc: desc_type descriptor to use as the loop cursor
124 * @desc_type: wanted descriptr type
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))
129
130 /**
131 * config_ep_by_speed_and_alt() - configures the given endpoint
132 * according to gadget speed.
133 * @g: pointer to the gadget
134 * @f: usb function
135 * @_ep: the endpoint to configure
136 * @alt: alternate setting number
137 *
138 * Return: error code, 0 on success
139 *
140 * This function chooses the right descriptors for a given
141 * endpoint according to gadget speed and saves it in the
142 * endpoint desc field. If the endpoint already has a descriptor
143 * assigned to it - overwrites it with currently corresponding
144 * descriptor. The endpoint maxpacket field is updated according
145 * to the chosen descriptor.
146 * Note: the supplied function should hold all the descriptors
147 * for supported speeds
148 */
config_ep_by_speed_and_alt(struct usb_gadget * g,struct usb_function * f,struct usb_ep * _ep,u8 alt)149 int 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; /* cursor for speed desc */
162 struct usb_composite_dev *cdev;
163 bool incomplete_desc = false;
164
165 if (!g || !f || !_ep)
166 return -EIO;
167
168 /* select desired speed */
169 switch (g->speed) {
170 case USB_SPEED_SUPER_PLUS:
171 if (gadget_is_superspeed_plus(g)) {
172 if (f->ssp_descriptors) {
173 speed_desc = f->ssp_descriptors;
174 want_comp_desc = 1;
175 break;
176 }
177 incomplete_desc = true;
178 }
179 fallthrough;
180 case USB_SPEED_SUPER:
181 if (gadget_is_superspeed(g)) {
182 if (f->ss_descriptors) {
183 speed_desc = f->ss_descriptors;
184 want_comp_desc = 1;
185 break;
186 }
187 incomplete_desc = true;
188 }
189 fallthrough;
190 case USB_SPEED_HIGH:
191 if (gadget_is_dualspeed(g)) {
192 if (f->hs_descriptors) {
193 speed_desc = f->hs_descriptors;
194 break;
195 }
196 incomplete_desc = true;
197 }
198 fallthrough;
199 default:
200 speed_desc = f->fs_descriptors;
201 }
202
203 cdev = get_gadget_data(g);
204 if (incomplete_desc)
205 WARNING(cdev,
206 "%s doesn't hold the descriptors for current speed\n",
207 f->name);
208
209 /* find correct alternate setting descriptor */
210 for_each_desc(speed_desc, d_spd, USB_DT_INTERFACE) {
211 int_desc = (struct usb_interface_descriptor *)*d_spd;
212
213 if (int_desc->bAlternateSetting == alt) {
214 speed_desc = d_spd;
215 goto intf_found;
216 }
217 }
218 return -EIO;
219
220 intf_found:
221 /* find descriptors */
222 for_each_desc(speed_desc, d_spd, USB_DT_ENDPOINT) {
223 chosen_desc = (struct usb_endpoint_descriptor *)*d_spd;
224 if (chosen_desc->bEndpointAddress == _ep->address)
225 goto ep_found;
226 }
227 return -EIO;
228
229 ep_found:
230 /* commit results */
231 _ep->maxpacket = usb_endpoint_maxp(chosen_desc);
232 _ep->desc = chosen_desc;
233 _ep->comp_desc = NULL;
234 _ep->maxburst = 0;
235 _ep->mult = 1;
236
237 if (g->speed == USB_SPEED_HIGH && (usb_endpoint_xfer_isoc(_ep->desc) ||
238 usb_endpoint_xfer_int(_ep->desc)))
239 _ep->mult = usb_endpoint_maxp_mult(_ep->desc);
240
241 if (!want_comp_desc)
242 return 0;
243
244 /*
245 * Companion descriptor should follow EP descriptor
246 * USB 3.0 spec, #9.6.7
247 */
248 comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd);
249 if (!comp_desc ||
250 (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP))
251 return -EIO;
252 _ep->comp_desc = comp_desc;
253 if (g->speed >= USB_SPEED_SUPER) {
254 switch (usb_endpoint_type(_ep->desc)) {
255 case USB_ENDPOINT_XFER_ISOC:
256 /* mult: bits 1:0 of bmAttributes */
257 _ep->mult = (comp_desc->bmAttributes & 0x3) + 1;
258 fallthrough;
259 case USB_ENDPOINT_XFER_BULK:
260 case USB_ENDPOINT_XFER_INT:
261 _ep->maxburst = comp_desc->bMaxBurst + 1;
262 break;
263 default:
264 if (comp_desc->bMaxBurst != 0)
265 ERROR(cdev, "ep0 bMaxBurst must be 0\n");
266 _ep->maxburst = 1;
267 break;
268 }
269 }
270 return 0;
271 }
272 EXPORT_SYMBOL_GPL(config_ep_by_speed_and_alt);
273
274 /**
275 * config_ep_by_speed() - configures the given endpoint
276 * according to gadget speed.
277 * @g: pointer to the gadget
278 * @f: usb function
279 * @_ep: the endpoint to configure
280 *
281 * Return: error code, 0 on success
282 *
283 * This function chooses the right descriptors for a given
284 * endpoint according to gadget speed and saves it in the
285 * endpoint desc field. If the endpoint already has a descriptor
286 * assigned to it - overwrites it with currently corresponding
287 * descriptor. The endpoint maxpacket field is updated according
288 * to the chosen descriptor.
289 * Note: the supplied function should hold all the descriptors
290 * for supported speeds
291 */
config_ep_by_speed(struct usb_gadget * g,struct usb_function * f,struct usb_ep * _ep)292 int config_ep_by_speed(struct usb_gadget *g,
293 struct usb_function *f,
294 struct usb_ep *_ep)
295 {
296 return config_ep_by_speed_and_alt(g, f, _ep, 0);
297 }
298 EXPORT_SYMBOL_GPL(config_ep_by_speed);
299
300 /**
301 * usb_add_function() - add a function to a configuration
302 * @config: the configuration
303 * @function: the function being added
304 * Context: single threaded during gadget setup
305 *
306 * After initialization, each configuration must have one or more
307 * functions added to it. Adding a function involves calling its @bind()
308 * method to allocate resources such as interface and string identifiers
309 * and endpoints.
310 *
311 * This function returns the value of the function's bind(), which is
312 * zero for success else a negative errno value.
313 */
usb_add_function(struct usb_configuration * config,struct usb_function * function)314 int usb_add_function(struct usb_configuration *config,
315 struct usb_function *function)
316 {
317 int value = -EINVAL;
318
319 DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n",
320 function->name, function,
321 config->label, config);
322
323 if (!function->set_alt || !function->disable)
324 goto done;
325
326 function->config = config;
327 list_add_tail(&function->list, &config->functions);
328
329 if (function->bind_deactivated) {
330 value = usb_function_deactivate(function);
331 if (value)
332 goto done;
333 }
334
335 /* REVISIT *require* function->bind? */
336 if (function->bind) {
337 value = function->bind(config, function);
338 if (value < 0) {
339 list_del(&function->list);
340 function->config = NULL;
341 }
342 } else
343 value = 0;
344
345 /* We allow configurations that don't work at both speeds.
346 * If we run into a lowspeed Linux system, treat it the same
347 * as full speed ... it's the function drivers that will need
348 * to avoid bulk and ISO transfers.
349 */
350 if (!config->fullspeed && function->fs_descriptors)
351 config->fullspeed = true;
352 if (!config->highspeed && function->hs_descriptors)
353 config->highspeed = true;
354 if (!config->superspeed && function->ss_descriptors)
355 config->superspeed = true;
356 if (!config->superspeed_plus && function->ssp_descriptors)
357 config->superspeed_plus = true;
358
359 done:
360 if (value)
361 DBG(config->cdev, "adding '%s'/%p --> %d\n",
362 function->name, function, value);
363 return value;
364 }
365 EXPORT_SYMBOL_GPL(usb_add_function);
366
usb_remove_function(struct usb_configuration * c,struct usb_function * f)367 void usb_remove_function(struct usb_configuration *c, struct usb_function *f)
368 {
369 if (f->disable)
370 f->disable(f);
371
372 bitmap_zero(f->endpoints, 32);
373 list_del(&f->list);
374 if (f->unbind)
375 f->unbind(c, f);
376
377 if (f->bind_deactivated)
378 usb_function_activate(f);
379 }
380 EXPORT_SYMBOL_GPL(usb_remove_function);
381
382 /**
383 * usb_function_deactivate - prevent function and gadget enumeration
384 * @function: the function that isn't yet ready to respond
385 *
386 * Blocks response of the gadget driver to host enumeration by
387 * preventing the data line pullup from being activated. This is
388 * normally called during @bind() processing to change from the
389 * initial "ready to respond" state, or when a required resource
390 * becomes available.
391 *
392 * For example, drivers that serve as a passthrough to a userspace
393 * daemon can block enumeration unless that daemon (such as an OBEX,
394 * MTP, or print server) is ready to handle host requests.
395 *
396 * Not all systems support software control of their USB peripheral
397 * data pullups.
398 *
399 * Returns zero on success, else negative errno.
400 */
usb_function_deactivate(struct usb_function * function)401 int usb_function_deactivate(struct usb_function *function)
402 {
403 struct usb_composite_dev *cdev = function->config->cdev;
404 unsigned long flags;
405 int status = 0;
406
407 spin_lock_irqsave(&cdev->lock, flags);
408
409 if (cdev->deactivations == 0) {
410 spin_unlock_irqrestore(&cdev->lock, flags);
411 status = usb_gadget_deactivate(cdev->gadget);
412 spin_lock_irqsave(&cdev->lock, flags);
413 }
414 if (status == 0)
415 cdev->deactivations++;
416
417 spin_unlock_irqrestore(&cdev->lock, flags);
418 return status;
419 }
420 EXPORT_SYMBOL_GPL(usb_function_deactivate);
421
422 /**
423 * usb_function_activate - allow function and gadget enumeration
424 * @function: function on which usb_function_activate() was called
425 *
426 * Reverses effect of usb_function_deactivate(). If no more functions
427 * are delaying their activation, the gadget driver will respond to
428 * host enumeration procedures.
429 *
430 * Returns zero on success, else negative errno.
431 */
usb_function_activate(struct usb_function * function)432 int usb_function_activate(struct usb_function *function)
433 {
434 struct usb_composite_dev *cdev = function->config->cdev;
435 unsigned long flags;
436 int status = 0;
437
438 spin_lock_irqsave(&cdev->lock, flags);
439
440 if (WARN_ON(cdev->deactivations == 0))
441 status = -EINVAL;
442 else {
443 cdev->deactivations--;
444 if (cdev->deactivations == 0) {
445 spin_unlock_irqrestore(&cdev->lock, flags);
446 status = usb_gadget_activate(cdev->gadget);
447 spin_lock_irqsave(&cdev->lock, flags);
448 }
449 }
450
451 spin_unlock_irqrestore(&cdev->lock, flags);
452 return status;
453 }
454 EXPORT_SYMBOL_GPL(usb_function_activate);
455
456 /**
457 * usb_interface_id() - allocate an unused interface ID
458 * @config: configuration associated with the interface
459 * @function: function handling the interface
460 * Context: single threaded during gadget setup
461 *
462 * usb_interface_id() is called from usb_function.bind() callbacks to
463 * allocate new interface IDs. The function driver will then store that
464 * ID in interface, association, CDC union, and other descriptors. It
465 * will also handle any control requests targeted at that interface,
466 * particularly changing its altsetting via set_alt(). There may
467 * also be class-specific or vendor-specific requests to handle.
468 *
469 * All interface identifier should be allocated using this routine, to
470 * ensure that for example different functions don't wrongly assign
471 * different meanings to the same identifier. Note that since interface
472 * identifiers are configuration-specific, functions used in more than
473 * one configuration (or more than once in a given configuration) need
474 * multiple versions of the relevant descriptors.
475 *
476 * Returns the interface ID which was allocated; or -ENODEV if no
477 * more interface IDs can be allocated.
478 */
usb_interface_id(struct usb_configuration * config,struct usb_function * function)479 int usb_interface_id(struct usb_configuration *config,
480 struct usb_function *function)
481 {
482 unsigned id = config->next_interface_id;
483
484 if (id < MAX_CONFIG_INTERFACES) {
485 config->interface[id] = function;
486 config->next_interface_id = id + 1;
487 return id;
488 }
489 return -ENODEV;
490 }
491 EXPORT_SYMBOL_GPL(usb_interface_id);
492
encode_bMaxPower(enum usb_device_speed speed,struct usb_configuration * c)493 static u8 encode_bMaxPower(enum usb_device_speed speed,
494 struct usb_configuration *c)
495 {
496 unsigned val;
497
498 if (c->MaxPower || (c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))
499 val = c->MaxPower;
500 else
501 val = CONFIG_USB_GADGET_VBUS_DRAW;
502 if (!val)
503 return 0;
504 if (speed < USB_SPEED_SUPER)
505 return min(val, 500U) / 2;
506 else
507 /*
508 * USB 3.x supports up to 900mA, but since 900 isn't divisible
509 * by 8 the integral division will effectively cap to 896mA.
510 */
511 return min(val, 900U) / 8;
512 }
513
config_buf(struct usb_configuration * config,enum usb_device_speed speed,void * buf,u8 type)514 static int config_buf(struct usb_configuration *config,
515 enum usb_device_speed speed, void *buf, u8 type)
516 {
517 struct usb_config_descriptor *c = buf;
518 void *next = buf + USB_DT_CONFIG_SIZE;
519 int len;
520 struct usb_function *f;
521 int status;
522
523 len = USB_COMP_EP0_BUFSIZ - USB_DT_CONFIG_SIZE;
524 /* write the config descriptor */
525 c = buf;
526 c->bLength = USB_DT_CONFIG_SIZE;
527 c->bDescriptorType = type;
528 /* wTotalLength is written later */
529 c->bNumInterfaces = config->next_interface_id;
530 c->bConfigurationValue = config->bConfigurationValue;
531 c->iConfiguration = config->iConfiguration;
532 c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes;
533 c->bMaxPower = encode_bMaxPower(speed, config);
534
535 /* There may be e.g. OTG descriptors */
536 if (config->descriptors) {
537 status = usb_descriptor_fillbuf(next, len,
538 config->descriptors);
539 if (status < 0)
540 return status;
541 len -= status;
542 next += status;
543 }
544
545 /* add each function's descriptors */
546 list_for_each_entry(f, &config->functions, list) {
547 struct usb_descriptor_header **descriptors;
548
549 descriptors = function_descriptors(f, speed);
550 if (!descriptors)
551 continue;
552 status = usb_descriptor_fillbuf(next, len,
553 (const struct usb_descriptor_header **) descriptors);
554 if (status < 0)
555 return status;
556 len -= status;
557 next += status;
558 }
559
560 len = next - buf;
561 c->wTotalLength = cpu_to_le16(len);
562 return len;
563 }
564
config_desc(struct usb_composite_dev * cdev,unsigned w_value)565 static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
566 {
567 struct usb_gadget *gadget = cdev->gadget;
568 struct usb_configuration *c;
569 struct list_head *pos;
570 u8 type = w_value >> 8;
571 enum usb_device_speed speed = USB_SPEED_UNKNOWN;
572
573 if (gadget->speed >= USB_SPEED_SUPER)
574 speed = gadget->speed;
575 else if (gadget_is_dualspeed(gadget)) {
576 int hs = 0;
577 if (gadget->speed == USB_SPEED_HIGH)
578 hs = 1;
579 if (type == USB_DT_OTHER_SPEED_CONFIG)
580 hs = !hs;
581 if (hs)
582 speed = USB_SPEED_HIGH;
583
584 }
585
586 /* This is a lookup by config *INDEX* */
587 w_value &= 0xff;
588
589 pos = &cdev->configs;
590 c = cdev->os_desc_config;
591 if (c)
592 goto check_config;
593
594 while ((pos = pos->next) != &cdev->configs) {
595 c = list_entry(pos, typeof(*c), list);
596
597 /* skip OS Descriptors config which is handled separately */
598 if (c == cdev->os_desc_config)
599 continue;
600
601 check_config:
602 /* ignore configs that won't work at this speed */
603 switch (speed) {
604 case USB_SPEED_SUPER_PLUS:
605 if (!c->superspeed_plus)
606 continue;
607 break;
608 case USB_SPEED_SUPER:
609 if (!c->superspeed)
610 continue;
611 break;
612 case USB_SPEED_HIGH:
613 if (!c->highspeed)
614 continue;
615 break;
616 default:
617 if (!c->fullspeed)
618 continue;
619 }
620
621 if (w_value == 0)
622 return config_buf(c, speed, cdev->req->buf, type);
623 w_value--;
624 }
625 return -EINVAL;
626 }
627
count_configs(struct usb_composite_dev * cdev,unsigned type)628 static int count_configs(struct usb_composite_dev *cdev, unsigned type)
629 {
630 struct usb_gadget *gadget = cdev->gadget;
631 struct usb_configuration *c;
632 unsigned count = 0;
633 int hs = 0;
634 int ss = 0;
635 int ssp = 0;
636
637 if (gadget_is_dualspeed(gadget)) {
638 if (gadget->speed == USB_SPEED_HIGH)
639 hs = 1;
640 if (gadget->speed == USB_SPEED_SUPER)
641 ss = 1;
642 if (gadget->speed == USB_SPEED_SUPER_PLUS)
643 ssp = 1;
644 if (type == USB_DT_DEVICE_QUALIFIER)
645 hs = !hs;
646 }
647 list_for_each_entry(c, &cdev->configs, list) {
648 /* ignore configs that won't work at this speed */
649 if (ssp) {
650 if (!c->superspeed_plus)
651 continue;
652 } else if (ss) {
653 if (!c->superspeed)
654 continue;
655 } else if (hs) {
656 if (!c->highspeed)
657 continue;
658 } else {
659 if (!c->fullspeed)
660 continue;
661 }
662 count++;
663 }
664 return count;
665 }
666
667 /**
668 * bos_desc() - prepares the BOS descriptor.
669 * @cdev: pointer to usb_composite device to generate the bos
670 * descriptor for
671 *
672 * This function generates the BOS (Binary Device Object)
673 * descriptor and its device capabilities descriptors. The BOS
674 * descriptor should be supported by a SuperSpeed device.
675 */
bos_desc(struct usb_composite_dev * cdev)676 static int bos_desc(struct usb_composite_dev *cdev)
677 {
678 struct usb_ext_cap_descriptor *usb_ext;
679 struct usb_dcd_config_params dcd_config_params;
680 struct usb_bos_descriptor *bos = cdev->req->buf;
681 unsigned int besl = 0;
682
683 bos->bLength = USB_DT_BOS_SIZE;
684 bos->bDescriptorType = USB_DT_BOS;
685
686 bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
687 bos->bNumDeviceCaps = 0;
688
689 /* Get Controller configuration */
690 if (cdev->gadget->ops->get_config_params) {
691 cdev->gadget->ops->get_config_params(cdev->gadget,
692 &dcd_config_params);
693 } else {
694 dcd_config_params.besl_baseline =
695 USB_DEFAULT_BESL_UNSPECIFIED;
696 dcd_config_params.besl_deep =
697 USB_DEFAULT_BESL_UNSPECIFIED;
698 dcd_config_params.bU1devExitLat =
699 USB_DEFAULT_U1_DEV_EXIT_LAT;
700 dcd_config_params.bU2DevExitLat =
701 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
702 }
703
704 if (dcd_config_params.besl_baseline != USB_DEFAULT_BESL_UNSPECIFIED)
705 besl = USB_BESL_BASELINE_VALID |
706 USB_SET_BESL_BASELINE(dcd_config_params.besl_baseline);
707
708 if (dcd_config_params.besl_deep != USB_DEFAULT_BESL_UNSPECIFIED)
709 besl |= USB_BESL_DEEP_VALID |
710 USB_SET_BESL_DEEP(dcd_config_params.besl_deep);
711
712 /*
713 * A SuperSpeed device shall include the USB2.0 extension descriptor
714 * and shall support LPM when operating in USB2.0 HS mode.
715 */
716 usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
717 bos->bNumDeviceCaps++;
718 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
719 usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
720 usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
721 usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
722 usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT |
723 USB_BESL_SUPPORT | besl);
724
725 /*
726 * The Superspeed USB Capability descriptor shall be implemented by all
727 * SuperSpeed devices.
728 */
729 if (gadget_is_superspeed(cdev->gadget)) {
730 struct usb_ss_cap_descriptor *ss_cap;
731
732 ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
733 bos->bNumDeviceCaps++;
734 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
735 ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
736 ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
737 ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
738 ss_cap->bmAttributes = 0; /* LTM is not supported yet */
739 ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
740 USB_FULL_SPEED_OPERATION |
741 USB_HIGH_SPEED_OPERATION |
742 USB_5GBPS_OPERATION);
743 ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
744 ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
745 ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
746 }
747
748 /* The SuperSpeedPlus USB Device Capability descriptor */
749 if (gadget_is_superspeed_plus(cdev->gadget)) {
750 struct usb_ssp_cap_descriptor *ssp_cap;
751 u8 ssac = 1;
752 u8 ssic;
753 int i;
754
755 if (cdev->gadget->max_ssp_rate == USB_SSP_GEN_2x2)
756 ssac = 3;
757
758 /*
759 * Paired RX and TX sublink speed attributes share
760 * the same SSID.
761 */
762 ssic = (ssac + 1) / 2 - 1;
763
764 ssp_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
765 bos->bNumDeviceCaps++;
766
767 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SSP_CAP_SIZE(ssac));
768 ssp_cap->bLength = USB_DT_USB_SSP_CAP_SIZE(ssac);
769 ssp_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
770 ssp_cap->bDevCapabilityType = USB_SSP_CAP_TYPE;
771 ssp_cap->bReserved = 0;
772 ssp_cap->wReserved = 0;
773
774 ssp_cap->bmAttributes =
775 cpu_to_le32(FIELD_PREP(USB_SSP_SUBLINK_SPEED_ATTRIBS, ssac) |
776 FIELD_PREP(USB_SSP_SUBLINK_SPEED_IDS, ssic));
777
778 ssp_cap->wFunctionalitySupport =
779 cpu_to_le16(FIELD_PREP(USB_SSP_MIN_SUBLINK_SPEED_ATTRIBUTE_ID, 0) |
780 FIELD_PREP(USB_SSP_MIN_RX_LANE_COUNT, 1) |
781 FIELD_PREP(USB_SSP_MIN_TX_LANE_COUNT, 1));
782
783 /*
784 * Use 1 SSID if the gadget supports up to gen2x1 or not
785 * specified:
786 * - SSID 0 for symmetric RX/TX sublink speed of 10 Gbps.
787 *
788 * Use 1 SSID if the gadget supports up to gen1x2:
789 * - SSID 0 for symmetric RX/TX sublink speed of 5 Gbps.
790 *
791 * Use 2 SSIDs if the gadget supports up to gen2x2:
792 * - SSID 0 for symmetric RX/TX sublink speed of 5 Gbps.
793 * - SSID 1 for symmetric RX/TX sublink speed of 10 Gbps.
794 */
795 for (i = 0; i < ssac + 1; i++) {
796 u8 ssid;
797 u8 mantissa;
798 u8 type;
799
800 ssid = i >> 1;
801
802 if (cdev->gadget->max_ssp_rate == USB_SSP_GEN_2x1 ||
803 cdev->gadget->max_ssp_rate == USB_SSP_GEN_UNKNOWN)
804 mantissa = 10;
805 else
806 mantissa = 5 << ssid;
807
808 if (i % 2)
809 type = USB_SSP_SUBLINK_SPEED_ST_SYM_TX;
810 else
811 type = USB_SSP_SUBLINK_SPEED_ST_SYM_RX;
812
813 ssp_cap->bmSublinkSpeedAttr[i] =
814 cpu_to_le32(FIELD_PREP(USB_SSP_SUBLINK_SPEED_SSID, ssid) |
815 FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSE,
816 USB_SSP_SUBLINK_SPEED_LSE_GBPS) |
817 FIELD_PREP(USB_SSP_SUBLINK_SPEED_ST, type) |
818 FIELD_PREP(USB_SSP_SUBLINK_SPEED_LP,
819 USB_SSP_SUBLINK_SPEED_LP_SSP) |
820 FIELD_PREP(USB_SSP_SUBLINK_SPEED_LSM, mantissa));
821 }
822 }
823
824 return le16_to_cpu(bos->wTotalLength);
825 }
826
device_qual(struct usb_composite_dev * cdev)827 static void device_qual(struct usb_composite_dev *cdev)
828 {
829 struct usb_qualifier_descriptor *qual = cdev->req->buf;
830
831 qual->bLength = sizeof(*qual);
832 qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
833 /* POLICY: same bcdUSB and device type info at both speeds */
834 qual->bcdUSB = cdev->desc.bcdUSB;
835 qual->bDeviceClass = cdev->desc.bDeviceClass;
836 qual->bDeviceSubClass = cdev->desc.bDeviceSubClass;
837 qual->bDeviceProtocol = cdev->desc.bDeviceProtocol;
838 /* ASSUME same EP0 fifo size at both speeds */
839 qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket;
840 qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER);
841 qual->bRESERVED = 0;
842 }
843
844 /*-------------------------------------------------------------------------*/
845
reset_config(struct usb_composite_dev * cdev)846 static void reset_config(struct usb_composite_dev *cdev)
847 {
848 struct usb_function *f;
849
850 DBG(cdev, "reset config\n");
851
852 list_for_each_entry(f, &cdev->config->functions, list) {
853 if (f->disable)
854 f->disable(f);
855
856 bitmap_zero(f->endpoints, 32);
857 }
858 cdev->config = NULL;
859 cdev->delayed_status = 0;
860 }
861
set_config(struct usb_composite_dev * cdev,const struct usb_ctrlrequest * ctrl,unsigned number)862 static int set_config(struct usb_composite_dev *cdev,
863 const struct usb_ctrlrequest *ctrl, unsigned number)
864 {
865 struct usb_gadget *gadget = cdev->gadget;
866 struct usb_configuration *c = NULL;
867 int result = -EINVAL;
868 unsigned power = gadget_is_otg(gadget) ? 8 : 100;
869 int tmp;
870
871 if (number) {
872 list_for_each_entry(c, &cdev->configs, list) {
873 if (c->bConfigurationValue == number) {
874 /*
875 * We disable the FDs of the previous
876 * configuration only if the new configuration
877 * is a valid one
878 */
879 if (cdev->config)
880 reset_config(cdev);
881 result = 0;
882 break;
883 }
884 }
885 if (result < 0)
886 goto done;
887 } else { /* Zero configuration value - need to reset the config */
888 if (cdev->config)
889 reset_config(cdev);
890 result = 0;
891 }
892
893 DBG(cdev, "%s config #%d: %s\n",
894 usb_speed_string(gadget->speed),
895 number, c ? c->label : "unconfigured");
896
897 if (!c)
898 goto done;
899
900 usb_gadget_set_state(gadget, USB_STATE_CONFIGURED);
901 cdev->config = c;
902
903 /* Initialize all interfaces by setting them to altsetting zero. */
904 for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) {
905 struct usb_function *f = c->interface[tmp];
906 struct usb_descriptor_header **descriptors;
907
908 if (!f)
909 break;
910
911 /*
912 * Record which endpoints are used by the function. This is used
913 * to dispatch control requests targeted at that endpoint to the
914 * function's setup callback instead of the current
915 * configuration's setup callback.
916 */
917 descriptors = function_descriptors(f, gadget->speed);
918
919 for (; *descriptors; ++descriptors) {
920 struct usb_endpoint_descriptor *ep;
921 int addr;
922
923 if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT)
924 continue;
925
926 ep = (struct usb_endpoint_descriptor *)*descriptors;
927 addr = ((ep->bEndpointAddress & 0x80) >> 3)
928 | (ep->bEndpointAddress & 0x0f);
929 set_bit(addr, f->endpoints);
930 }
931
932 result = f->set_alt(f, tmp, 0);
933 if (result < 0) {
934 DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n",
935 tmp, f->name, f, result);
936
937 reset_config(cdev);
938 goto done;
939 }
940
941 if (result == USB_GADGET_DELAYED_STATUS) {
942 DBG(cdev,
943 "%s: interface %d (%s) requested delayed status\n",
944 __func__, tmp, f->name);
945 cdev->delayed_status++;
946 DBG(cdev, "delayed_status count %d\n",
947 cdev->delayed_status);
948 }
949 }
950
951 /* when we return, be sure our power usage is valid */
952 if (c->MaxPower || (c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))
953 power = c->MaxPower;
954 else
955 power = CONFIG_USB_GADGET_VBUS_DRAW;
956
957 if (gadget->speed < USB_SPEED_SUPER)
958 power = min(power, 500U);
959 else
960 power = min(power, 900U);
961 done:
962 if (power <= USB_SELF_POWER_VBUS_MAX_DRAW)
963 usb_gadget_set_selfpowered(gadget);
964 else
965 usb_gadget_clear_selfpowered(gadget);
966
967 usb_gadget_vbus_draw(gadget, power);
968 if (result >= 0 && cdev->delayed_status)
969 result = USB_GADGET_DELAYED_STATUS;
970 return result;
971 }
972
usb_add_config_only(struct usb_composite_dev * cdev,struct usb_configuration * config)973 int usb_add_config_only(struct usb_composite_dev *cdev,
974 struct usb_configuration *config)
975 {
976 struct usb_configuration *c;
977
978 if (!config->bConfigurationValue)
979 return -EINVAL;
980
981 /* Prevent duplicate configuration identifiers */
982 list_for_each_entry(c, &cdev->configs, list) {
983 if (c->bConfigurationValue == config->bConfigurationValue)
984 return -EBUSY;
985 }
986
987 config->cdev = cdev;
988 list_add_tail(&config->list, &cdev->configs);
989
990 INIT_LIST_HEAD(&config->functions);
991 config->next_interface_id = 0;
992 memset(config->interface, 0, sizeof(config->interface));
993
994 return 0;
995 }
996 EXPORT_SYMBOL_GPL(usb_add_config_only);
997
998 /**
999 * usb_add_config() - add a configuration to a device.
1000 * @cdev: wraps the USB gadget
1001 * @config: the configuration, with bConfigurationValue assigned
1002 * @bind: the configuration's bind function
1003 * Context: single threaded during gadget setup
1004 *
1005 * One of the main tasks of a composite @bind() routine is to
1006 * add each of the configurations it supports, using this routine.
1007 *
1008 * This function returns the value of the configuration's @bind(), which
1009 * is zero for success else a negative errno value. Binding configurations
1010 * assigns global resources including string IDs, and per-configuration
1011 * resources such as interface IDs and endpoints.
1012 */
usb_add_config(struct usb_composite_dev * cdev,struct usb_configuration * config,int (* bind)(struct usb_configuration *))1013 int usb_add_config(struct usb_composite_dev *cdev,
1014 struct usb_configuration *config,
1015 int (*bind)(struct usb_configuration *))
1016 {
1017 int status = -EINVAL;
1018
1019 if (!bind)
1020 goto done;
1021
1022 DBG(cdev, "adding config #%u '%s'/%p\n",
1023 config->bConfigurationValue,
1024 config->label, config);
1025
1026 status = usb_add_config_only(cdev, config);
1027 if (status)
1028 goto done;
1029
1030 status = bind(config);
1031 if (status < 0) {
1032 while (!list_empty(&config->functions)) {
1033 struct usb_function *f;
1034
1035 f = list_first_entry(&config->functions,
1036 struct usb_function, list);
1037 list_del(&f->list);
1038 if (f->unbind) {
1039 DBG(cdev, "unbind function '%s'/%p\n",
1040 f->name, f);
1041 f->unbind(config, f);
1042 /* may free memory for "f" */
1043 }
1044 }
1045 list_del(&config->list);
1046 config->cdev = NULL;
1047 } else {
1048 unsigned i;
1049
1050 DBG(cdev, "cfg %d/%p speeds:%s%s%s%s\n",
1051 config->bConfigurationValue, config,
1052 config->superspeed_plus ? " superplus" : "",
1053 config->superspeed ? " super" : "",
1054 config->highspeed ? " high" : "",
1055 config->fullspeed
1056 ? (gadget_is_dualspeed(cdev->gadget)
1057 ? " full"
1058 : " full/low")
1059 : "");
1060
1061 for (i = 0; i < MAX_CONFIG_INTERFACES; i++) {
1062 struct usb_function *f = config->interface[i];
1063
1064 if (!f)
1065 continue;
1066 DBG(cdev, " interface %d = %s/%p\n",
1067 i, f->name, f);
1068 }
1069 }
1070
1071 /* set_alt(), or next bind(), sets up ep->claimed as needed */
1072 usb_ep_autoconfig_reset(cdev->gadget);
1073
1074 done:
1075 if (status)
1076 DBG(cdev, "added config '%s'/%u --> %d\n", config->label,
1077 config->bConfigurationValue, status);
1078 return status;
1079 }
1080 EXPORT_SYMBOL_GPL(usb_add_config);
1081
remove_config(struct usb_composite_dev * cdev,struct usb_configuration * config)1082 static void remove_config(struct usb_composite_dev *cdev,
1083 struct usb_configuration *config)
1084 {
1085 while (!list_empty(&config->functions)) {
1086 struct usb_function *f;
1087
1088 f = list_first_entry(&config->functions,
1089 struct usb_function, list);
1090
1091 usb_remove_function(config, f);
1092 }
1093 list_del(&config->list);
1094 if (config->unbind) {
1095 DBG(cdev, "unbind config '%s'/%p\n", config->label, config);
1096 config->unbind(config);
1097 /* may free memory for "c" */
1098 }
1099 }
1100
1101 /**
1102 * usb_remove_config() - remove a configuration from a device.
1103 * @cdev: wraps the USB gadget
1104 * @config: the configuration
1105 *
1106 * Drivers must call usb_gadget_disconnect before calling this function
1107 * to disconnect the device from the host and make sure the host will not
1108 * try to enumerate the device while we are changing the config list.
1109 */
usb_remove_config(struct usb_composite_dev * cdev,struct usb_configuration * config)1110 void usb_remove_config(struct usb_composite_dev *cdev,
1111 struct usb_configuration *config)
1112 {
1113 unsigned long flags;
1114
1115 spin_lock_irqsave(&cdev->lock, flags);
1116
1117 if (cdev->config == config)
1118 reset_config(cdev);
1119
1120 spin_unlock_irqrestore(&cdev->lock, flags);
1121
1122 remove_config(cdev, config);
1123 }
1124
1125 /*-------------------------------------------------------------------------*/
1126
1127 /* We support strings in multiple languages ... string descriptor zero
1128 * says which languages are supported. The typical case will be that
1129 * only one language (probably English) is used, with i18n handled on
1130 * the host side.
1131 */
1132
collect_langs(struct usb_gadget_strings ** sp,__le16 * buf)1133 static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf)
1134 {
1135 const struct usb_gadget_strings *s;
1136 __le16 language;
1137 __le16 *tmp;
1138
1139 while (*sp) {
1140 s = *sp;
1141 language = cpu_to_le16(s->language);
1142 for (tmp = buf; *tmp && tmp < &buf[USB_MAX_STRING_LEN]; tmp++) {
1143 if (*tmp == language)
1144 goto repeat;
1145 }
1146 *tmp++ = language;
1147 repeat:
1148 sp++;
1149 }
1150 }
1151
lookup_string(struct usb_gadget_strings ** sp,void * buf,u16 language,int id)1152 static int lookup_string(
1153 struct usb_gadget_strings **sp,
1154 void *buf,
1155 u16 language,
1156 int id
1157 )
1158 {
1159 struct usb_gadget_strings *s;
1160 int value;
1161
1162 while (*sp) {
1163 s = *sp++;
1164 if (s->language != language)
1165 continue;
1166 value = usb_gadget_get_string(s, id, buf);
1167 if (value > 0)
1168 return value;
1169 }
1170 return -EINVAL;
1171 }
1172
get_string(struct usb_composite_dev * cdev,void * buf,u16 language,int id)1173 static int get_string(struct usb_composite_dev *cdev,
1174 void *buf, u16 language, int id)
1175 {
1176 struct usb_composite_driver *composite = cdev->driver;
1177 struct usb_gadget_string_container *uc;
1178 struct usb_configuration *c;
1179 struct usb_function *f;
1180 int len;
1181
1182 /* Yes, not only is USB's i18n support probably more than most
1183 * folk will ever care about ... also, it's all supported here.
1184 * (Except for UTF8 support for Unicode's "Astral Planes".)
1185 */
1186
1187 /* 0 == report all available language codes */
1188 if (id == 0) {
1189 struct usb_string_descriptor *s = buf;
1190 struct usb_gadget_strings **sp;
1191
1192 memset(s, 0, 256);
1193 s->bDescriptorType = USB_DT_STRING;
1194
1195 sp = composite->strings;
1196 if (sp)
1197 collect_langs(sp, s->wData);
1198
1199 list_for_each_entry(c, &cdev->configs, list) {
1200 sp = c->strings;
1201 if (sp)
1202 collect_langs(sp, s->wData);
1203
1204 list_for_each_entry(f, &c->functions, list) {
1205 sp = f->strings;
1206 if (sp)
1207 collect_langs(sp, s->wData);
1208 }
1209 }
1210 list_for_each_entry(uc, &cdev->gstrings, list) {
1211 struct usb_gadget_strings **sp;
1212
1213 sp = get_containers_gs(uc);
1214 collect_langs(sp, s->wData);
1215 }
1216
1217 for (len = 0; len <= USB_MAX_STRING_LEN && s->wData[len]; len++)
1218 continue;
1219 if (!len)
1220 return -EINVAL;
1221
1222 s->bLength = 2 * (len + 1);
1223 return s->bLength;
1224 }
1225
1226 if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) {
1227 struct usb_os_string *b = buf;
1228 b->bLength = sizeof(*b);
1229 b->bDescriptorType = USB_DT_STRING;
1230 compiletime_assert(
1231 sizeof(b->qwSignature) == sizeof(cdev->qw_sign),
1232 "qwSignature size must be equal to qw_sign");
1233 memcpy(&b->qwSignature, cdev->qw_sign, sizeof(b->qwSignature));
1234 b->bMS_VendorCode = cdev->b_vendor_code;
1235 b->bPad = 0;
1236 return sizeof(*b);
1237 }
1238
1239 list_for_each_entry(uc, &cdev->gstrings, list) {
1240 struct usb_gadget_strings **sp;
1241
1242 sp = get_containers_gs(uc);
1243 len = lookup_string(sp, buf, language, id);
1244 if (len > 0)
1245 return len;
1246 }
1247
1248 /* String IDs are device-scoped, so we look up each string
1249 * table we're told about. These lookups are infrequent;
1250 * simpler-is-better here.
1251 */
1252 if (composite->strings) {
1253 len = lookup_string(composite->strings, buf, language, id);
1254 if (len > 0)
1255 return len;
1256 }
1257 list_for_each_entry(c, &cdev->configs, list) {
1258 if (c->strings) {
1259 len = lookup_string(c->strings, buf, language, id);
1260 if (len > 0)
1261 return len;
1262 }
1263 list_for_each_entry(f, &c->functions, list) {
1264 if (!f->strings)
1265 continue;
1266 len = lookup_string(f->strings, buf, language, id);
1267 if (len > 0)
1268 return len;
1269 }
1270 }
1271 return -EINVAL;
1272 }
1273
1274 /**
1275 * usb_string_id() - allocate an unused string ID
1276 * @cdev: the device whose string descriptor IDs are being allocated
1277 * Context: single threaded during gadget setup
1278 *
1279 * @usb_string_id() is called from bind() callbacks to allocate
1280 * string IDs. Drivers for functions, configurations, or gadgets will
1281 * then store that ID in the appropriate descriptors and string table.
1282 *
1283 * All string identifier should be allocated using this,
1284 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
1285 * that for example different functions don't wrongly assign different
1286 * meanings to the same identifier.
1287 */
usb_string_id(struct usb_composite_dev * cdev)1288 int usb_string_id(struct usb_composite_dev *cdev)
1289 {
1290 if (cdev->next_string_id < 254) {
1291 /* string id 0 is reserved by USB spec for list of
1292 * supported languages */
1293 /* 255 reserved as well? -- mina86 */
1294 cdev->next_string_id++;
1295 return cdev->next_string_id;
1296 }
1297 return -ENODEV;
1298 }
1299 EXPORT_SYMBOL_GPL(usb_string_id);
1300
1301 /**
1302 * usb_string_ids_tab() - allocate unused string IDs in batch
1303 * @cdev: the device whose string descriptor IDs are being allocated
1304 * @str: an array of usb_string objects to assign numbers to
1305 * Context: single threaded during gadget setup
1306 *
1307 * @usb_string_ids() is called from bind() callbacks to allocate
1308 * string IDs. Drivers for functions, configurations, or gadgets will
1309 * then copy IDs from the string table to the appropriate descriptors
1310 * and string table for other languages.
1311 *
1312 * All string identifier should be allocated using this,
1313 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1314 * example different functions don't wrongly assign different meanings
1315 * to the same identifier.
1316 */
usb_string_ids_tab(struct usb_composite_dev * cdev,struct usb_string * str)1317 int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
1318 {
1319 int next = cdev->next_string_id;
1320
1321 for (; str->s; ++str) {
1322 if (unlikely(next >= 254))
1323 return -ENODEV;
1324 str->id = ++next;
1325 }
1326
1327 cdev->next_string_id = next;
1328
1329 return 0;
1330 }
1331 EXPORT_SYMBOL_GPL(usb_string_ids_tab);
1332
copy_gadget_strings(struct usb_gadget_strings ** sp,unsigned n_gstrings,unsigned n_strings)1333 static struct usb_gadget_string_container *copy_gadget_strings(
1334 struct usb_gadget_strings **sp, unsigned n_gstrings,
1335 unsigned n_strings)
1336 {
1337 struct usb_gadget_string_container *uc;
1338 struct usb_gadget_strings **gs_array;
1339 struct usb_gadget_strings *gs;
1340 struct usb_string *s;
1341 unsigned mem;
1342 unsigned n_gs;
1343 unsigned n_s;
1344 void *stash;
1345
1346 mem = sizeof(*uc);
1347 mem += sizeof(void *) * (n_gstrings + 1);
1348 mem += sizeof(struct usb_gadget_strings) * n_gstrings;
1349 mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings);
1350 uc = kmalloc(mem, GFP_KERNEL);
1351 if (!uc)
1352 return ERR_PTR(-ENOMEM);
1353 gs_array = get_containers_gs(uc);
1354 stash = uc->stash;
1355 stash += sizeof(void *) * (n_gstrings + 1);
1356 for (n_gs = 0; n_gs < n_gstrings; n_gs++) {
1357 struct usb_string *org_s;
1358
1359 gs_array[n_gs] = stash;
1360 gs = gs_array[n_gs];
1361 stash += sizeof(struct usb_gadget_strings);
1362 gs->language = sp[n_gs]->language;
1363 gs->strings = stash;
1364 org_s = sp[n_gs]->strings;
1365
1366 for (n_s = 0; n_s < n_strings; n_s++) {
1367 s = stash;
1368 stash += sizeof(struct usb_string);
1369 if (org_s->s)
1370 s->s = org_s->s;
1371 else
1372 s->s = "";
1373 org_s++;
1374 }
1375 s = stash;
1376 s->s = NULL;
1377 stash += sizeof(struct usb_string);
1378
1379 }
1380 gs_array[n_gs] = NULL;
1381 return uc;
1382 }
1383
1384 /**
1385 * usb_gstrings_attach() - attach gadget strings to a cdev and assign ids
1386 * @cdev: the device whose string descriptor IDs are being allocated
1387 * and attached.
1388 * @sp: an array of usb_gadget_strings to attach.
1389 * @n_strings: number of entries in each usb_strings array (sp[]->strings)
1390 *
1391 * This function will create a deep copy of usb_gadget_strings and usb_string
1392 * and attach it to the cdev. The actual string (usb_string.s) will not be
1393 * copied but only a referenced will be made. The struct usb_gadget_strings
1394 * array may contain multiple languages and should be NULL terminated.
1395 * The ->language pointer of each struct usb_gadget_strings has to contain the
1396 * same amount of entries.
1397 * For instance: sp[0] is en-US, sp[1] is es-ES. It is expected that the first
1398 * usb_string entry of es-ES contains the translation of the first usb_string
1399 * entry of en-US. Therefore both entries become the same id assign.
1400 */
usb_gstrings_attach(struct usb_composite_dev * cdev,struct usb_gadget_strings ** sp,unsigned n_strings)1401 struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
1402 struct usb_gadget_strings **sp, unsigned n_strings)
1403 {
1404 struct usb_gadget_string_container *uc;
1405 struct usb_gadget_strings **n_gs;
1406 unsigned n_gstrings = 0;
1407 unsigned i;
1408 int ret;
1409
1410 for (i = 0; sp[i]; i++)
1411 n_gstrings++;
1412
1413 if (!n_gstrings)
1414 return ERR_PTR(-EINVAL);
1415
1416 uc = copy_gadget_strings(sp, n_gstrings, n_strings);
1417 if (IS_ERR(uc))
1418 return ERR_CAST(uc);
1419
1420 n_gs = get_containers_gs(uc);
1421 ret = usb_string_ids_tab(cdev, n_gs[0]->strings);
1422 if (ret)
1423 goto err;
1424
1425 for (i = 1; i < n_gstrings; i++) {
1426 struct usb_string *m_s;
1427 struct usb_string *s;
1428 unsigned n;
1429
1430 m_s = n_gs[0]->strings;
1431 s = n_gs[i]->strings;
1432 for (n = 0; n < n_strings; n++) {
1433 s->id = m_s->id;
1434 s++;
1435 m_s++;
1436 }
1437 }
1438 list_add_tail(&uc->list, &cdev->gstrings);
1439 return n_gs[0]->strings;
1440 err:
1441 kfree(uc);
1442 return ERR_PTR(ret);
1443 }
1444 EXPORT_SYMBOL_GPL(usb_gstrings_attach);
1445
1446 /**
1447 * usb_string_ids_n() - allocate unused string IDs in batch
1448 * @c: the device whose string descriptor IDs are being allocated
1449 * @n: number of string IDs to allocate
1450 * Context: single threaded during gadget setup
1451 *
1452 * Returns the first requested ID. This ID and next @n-1 IDs are now
1453 * valid IDs. At least provided that @n is non-zero because if it
1454 * is, returns last requested ID which is now very useful information.
1455 *
1456 * @usb_string_ids_n() is called from bind() callbacks to allocate
1457 * string IDs. Drivers for functions, configurations, or gadgets will
1458 * then store that ID in the appropriate descriptors and string table.
1459 *
1460 * All string identifier should be allocated using this,
1461 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1462 * example different functions don't wrongly assign different meanings
1463 * to the same identifier.
1464 */
usb_string_ids_n(struct usb_composite_dev * c,unsigned n)1465 int usb_string_ids_n(struct usb_composite_dev *c, unsigned n)
1466 {
1467 unsigned next = c->next_string_id;
1468 if (unlikely(n > 254 || (unsigned)next + n > 254))
1469 return -ENODEV;
1470 c->next_string_id += n;
1471 return next + 1;
1472 }
1473 EXPORT_SYMBOL_GPL(usb_string_ids_n);
1474
1475 /*-------------------------------------------------------------------------*/
1476
composite_setup_complete(struct usb_ep * ep,struct usb_request * req)1477 static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
1478 {
1479 struct usb_composite_dev *cdev;
1480
1481 if (req->status || req->actual != req->length)
1482 DBG((struct usb_composite_dev *) ep->driver_data,
1483 "setup complete --> %d, %d/%d\n",
1484 req->status, req->actual, req->length);
1485
1486 /*
1487 * REVIST The same ep0 requests are shared with function drivers
1488 * so they don't have to maintain the same ->complete() stubs.
1489 *
1490 * Because of that, we need to check for the validity of ->context
1491 * here, even though we know we've set it to something useful.
1492 */
1493 if (!req->context)
1494 return;
1495
1496 cdev = req->context;
1497
1498 if (cdev->req == req)
1499 cdev->setup_pending = false;
1500 else if (cdev->os_desc_req == req)
1501 cdev->os_desc_pending = false;
1502 else
1503 WARN(1, "unknown request %p\n", req);
1504 }
1505
composite_ep0_queue(struct usb_composite_dev * cdev,struct usb_request * req,gfp_t gfp_flags)1506 static int composite_ep0_queue(struct usb_composite_dev *cdev,
1507 struct usb_request *req, gfp_t gfp_flags)
1508 {
1509 int ret;
1510
1511 ret = usb_ep_queue(cdev->gadget->ep0, req, gfp_flags);
1512 if (ret == 0) {
1513 if (cdev->req == req)
1514 cdev->setup_pending = true;
1515 else if (cdev->os_desc_req == req)
1516 cdev->os_desc_pending = true;
1517 else
1518 WARN(1, "unknown request %p\n", req);
1519 }
1520
1521 return ret;
1522 }
1523
count_ext_compat(struct usb_configuration * c)1524 static int count_ext_compat(struct usb_configuration *c)
1525 {
1526 int i, res;
1527
1528 res = 0;
1529 for (i = 0; i < c->next_interface_id; ++i) {
1530 struct usb_function *f;
1531 int j;
1532
1533 f = c->interface[i];
1534 for (j = 0; j < f->os_desc_n; ++j) {
1535 struct usb_os_desc *d;
1536
1537 if (i != f->os_desc_table[j].if_id)
1538 continue;
1539 d = f->os_desc_table[j].os_desc;
1540 if (d && d->ext_compat_id)
1541 ++res;
1542 }
1543 }
1544 BUG_ON(res > 255);
1545 return res;
1546 }
1547
fill_ext_compat(struct usb_configuration * c,u8 * buf)1548 static int fill_ext_compat(struct usb_configuration *c, u8 *buf)
1549 {
1550 int i, count;
1551
1552 count = 16;
1553 buf += 16;
1554 for (i = 0; i < c->next_interface_id; ++i) {
1555 struct usb_function *f;
1556 int j;
1557
1558 f = c->interface[i];
1559 for (j = 0; j < f->os_desc_n; ++j) {
1560 struct usb_os_desc *d;
1561
1562 if (i != f->os_desc_table[j].if_id)
1563 continue;
1564 d = f->os_desc_table[j].os_desc;
1565 if (d && d->ext_compat_id) {
1566 *buf++ = i;
1567 *buf++ = 0x01;
1568 memcpy(buf, d->ext_compat_id, 16);
1569 buf += 22;
1570 } else {
1571 ++buf;
1572 *buf = 0x01;
1573 buf += 23;
1574 }
1575 count += 24;
1576 if (count + 24 >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1577 return count;
1578 }
1579 }
1580
1581 return count;
1582 }
1583
count_ext_prop(struct usb_configuration * c,int interface)1584 static int count_ext_prop(struct usb_configuration *c, int interface)
1585 {
1586 struct usb_function *f;
1587 int j;
1588
1589 f = c->interface[interface];
1590 for (j = 0; j < f->os_desc_n; ++j) {
1591 struct usb_os_desc *d;
1592
1593 if (interface != f->os_desc_table[j].if_id)
1594 continue;
1595 d = f->os_desc_table[j].os_desc;
1596 if (d && d->ext_compat_id)
1597 return d->ext_prop_count;
1598 }
1599 return 0;
1600 }
1601
len_ext_prop(struct usb_configuration * c,int interface)1602 static int len_ext_prop(struct usb_configuration *c, int interface)
1603 {
1604 struct usb_function *f;
1605 struct usb_os_desc *d;
1606 int j, res;
1607
1608 res = 10; /* header length */
1609 f = c->interface[interface];
1610 for (j = 0; j < f->os_desc_n; ++j) {
1611 if (interface != f->os_desc_table[j].if_id)
1612 continue;
1613 d = f->os_desc_table[j].os_desc;
1614 if (d)
1615 return min(res + d->ext_prop_len, 4096);
1616 }
1617 return res;
1618 }
1619
fill_ext_prop(struct usb_configuration * c,int interface,u8 * buf)1620 static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
1621 {
1622 struct usb_function *f;
1623 struct usb_os_desc *d;
1624 struct usb_os_desc_ext_prop *ext_prop;
1625 int j, count, n, ret;
1626
1627 f = c->interface[interface];
1628 count = 10; /* header length */
1629 buf += 10;
1630 for (j = 0; j < f->os_desc_n; ++j) {
1631 if (interface != f->os_desc_table[j].if_id)
1632 continue;
1633 d = f->os_desc_table[j].os_desc;
1634 if (d)
1635 list_for_each_entry(ext_prop, &d->ext_prop, entry) {
1636 n = ext_prop->data_len +
1637 ext_prop->name_len + 14;
1638 if (count + n >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1639 return count;
1640 usb_ext_prop_put_size(buf, n);
1641 usb_ext_prop_put_type(buf, ext_prop->type);
1642 ret = usb_ext_prop_put_name(buf, ext_prop->name,
1643 ext_prop->name_len);
1644 if (ret < 0)
1645 return ret;
1646 switch (ext_prop->type) {
1647 case USB_EXT_PROP_UNICODE:
1648 case USB_EXT_PROP_UNICODE_ENV:
1649 case USB_EXT_PROP_UNICODE_LINK:
1650 usb_ext_prop_put_unicode(buf, ret,
1651 ext_prop->data,
1652 ext_prop->data_len);
1653 break;
1654 case USB_EXT_PROP_BINARY:
1655 usb_ext_prop_put_binary(buf, ret,
1656 ext_prop->data,
1657 ext_prop->data_len);
1658 break;
1659 case USB_EXT_PROP_LE32:
1660 /* not implemented */
1661 case USB_EXT_PROP_BE32:
1662 /* not implemented */
1663 default:
1664 return -EINVAL;
1665 }
1666 buf += n;
1667 count += n;
1668 }
1669 }
1670
1671 return count;
1672 }
1673
1674 /*
1675 * The setup() callback implements all the ep0 functionality that's
1676 * not handled lower down, in hardware or the hardware driver(like
1677 * device and endpoint feature flags, and their status). It's all
1678 * housekeeping for the gadget function we're implementing. Most of
1679 * the work is in config and function specific setup.
1680 */
1681 int
composite_setup(struct usb_gadget * gadget,const struct usb_ctrlrequest * ctrl)1682 composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1683 {
1684 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1685 struct usb_request *req = cdev->req;
1686 int value = -EOPNOTSUPP;
1687 int status = 0;
1688 u16 w_index = le16_to_cpu(ctrl->wIndex);
1689 u8 intf = w_index & 0xFF;
1690 u16 w_value = le16_to_cpu(ctrl->wValue);
1691 u16 w_length = le16_to_cpu(ctrl->wLength);
1692 struct usb_function *f = NULL;
1693 u8 endp;
1694
1695 if (w_length > USB_COMP_EP0_BUFSIZ) {
1696 if (ctrl->bRequestType & USB_DIR_IN) {
1697 /* Cast away the const, we are going to overwrite on purpose. */
1698 __le16 *temp = (__le16 *)&ctrl->wLength;
1699
1700 *temp = cpu_to_le16(USB_COMP_EP0_BUFSIZ);
1701 w_length = USB_COMP_EP0_BUFSIZ;
1702 } else {
1703 goto done;
1704 }
1705 }
1706
1707 /* partial re-init of the response message; the function or the
1708 * gadget might need to intercept e.g. a control-OUT completion
1709 * when we delegate to it.
1710 */
1711 req->zero = 0;
1712 req->context = cdev;
1713 req->complete = composite_setup_complete;
1714 req->length = 0;
1715 gadget->ep0->driver_data = cdev;
1716
1717 /*
1718 * Don't let non-standard requests match any of the cases below
1719 * by accident.
1720 */
1721 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
1722 goto unknown;
1723
1724 switch (ctrl->bRequest) {
1725
1726 /* we handle all standard USB descriptors */
1727 case USB_REQ_GET_DESCRIPTOR:
1728 if (ctrl->bRequestType != USB_DIR_IN)
1729 goto unknown;
1730 switch (w_value >> 8) {
1731
1732 case USB_DT_DEVICE:
1733 cdev->desc.bNumConfigurations =
1734 count_configs(cdev, USB_DT_DEVICE);
1735 cdev->desc.bMaxPacketSize0 =
1736 cdev->gadget->ep0->maxpacket;
1737 if (gadget_is_superspeed(gadget)) {
1738 if (gadget->speed >= USB_SPEED_SUPER) {
1739 cdev->desc.bcdUSB = cpu_to_le16(0x0320);
1740 cdev->desc.bMaxPacketSize0 = 9;
1741 } else {
1742 cdev->desc.bcdUSB = cpu_to_le16(0x0210);
1743 }
1744 } else {
1745 if (gadget->lpm_capable)
1746 cdev->desc.bcdUSB = cpu_to_le16(0x0201);
1747 else
1748 cdev->desc.bcdUSB = cpu_to_le16(0x0200);
1749 }
1750
1751 value = min(w_length, (u16) sizeof cdev->desc);
1752 memcpy(req->buf, &cdev->desc, value);
1753 break;
1754 case USB_DT_DEVICE_QUALIFIER:
1755 if (!gadget_is_dualspeed(gadget) ||
1756 gadget->speed >= USB_SPEED_SUPER)
1757 break;
1758 device_qual(cdev);
1759 value = min_t(int, w_length,
1760 sizeof(struct usb_qualifier_descriptor));
1761 break;
1762 case USB_DT_OTHER_SPEED_CONFIG:
1763 if (!gadget_is_dualspeed(gadget) ||
1764 gadget->speed >= USB_SPEED_SUPER)
1765 break;
1766 fallthrough;
1767 case USB_DT_CONFIG:
1768 value = config_desc(cdev, w_value);
1769 if (value >= 0)
1770 value = min(w_length, (u16) value);
1771 break;
1772 case USB_DT_STRING:
1773 value = get_string(cdev, req->buf,
1774 w_index, w_value & 0xff);
1775 if (value >= 0)
1776 value = min(w_length, (u16) value);
1777 break;
1778 case USB_DT_BOS:
1779 if (gadget_is_superspeed(gadget) ||
1780 gadget->lpm_capable) {
1781 value = bos_desc(cdev);
1782 value = min(w_length, (u16) value);
1783 }
1784 break;
1785 case USB_DT_OTG:
1786 if (gadget_is_otg(gadget)) {
1787 struct usb_configuration *config;
1788 int otg_desc_len = 0;
1789
1790 if (cdev->config)
1791 config = cdev->config;
1792 else
1793 config = list_first_entry(
1794 &cdev->configs,
1795 struct usb_configuration, list);
1796 if (!config)
1797 goto done;
1798
1799 if (gadget->otg_caps &&
1800 (gadget->otg_caps->otg_rev >= 0x0200))
1801 otg_desc_len += sizeof(
1802 struct usb_otg20_descriptor);
1803 else
1804 otg_desc_len += sizeof(
1805 struct usb_otg_descriptor);
1806
1807 value = min_t(int, w_length, otg_desc_len);
1808 memcpy(req->buf, config->descriptors[0], value);
1809 }
1810 break;
1811 }
1812 break;
1813
1814 /* any number of configs can work */
1815 case USB_REQ_SET_CONFIGURATION:
1816 if (ctrl->bRequestType != 0)
1817 goto unknown;
1818 if (gadget_is_otg(gadget)) {
1819 if (gadget->a_hnp_support)
1820 DBG(cdev, "HNP available\n");
1821 else if (gadget->a_alt_hnp_support)
1822 DBG(cdev, "HNP on another port\n");
1823 else
1824 VDBG(cdev, "HNP inactive\n");
1825 }
1826 spin_lock(&cdev->lock);
1827 value = set_config(cdev, ctrl, w_value);
1828 spin_unlock(&cdev->lock);
1829 break;
1830 case USB_REQ_GET_CONFIGURATION:
1831 if (ctrl->bRequestType != USB_DIR_IN)
1832 goto unknown;
1833 if (cdev->config)
1834 *(u8 *)req->buf = cdev->config->bConfigurationValue;
1835 else
1836 *(u8 *)req->buf = 0;
1837 value = min(w_length, (u16) 1);
1838 break;
1839
1840 /* function drivers must handle get/set altsetting */
1841 case USB_REQ_SET_INTERFACE:
1842 if (ctrl->bRequestType != USB_RECIP_INTERFACE)
1843 goto unknown;
1844 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1845 break;
1846 f = cdev->config->interface[intf];
1847 if (!f)
1848 break;
1849
1850 /*
1851 * If there's no get_alt() method, we know only altsetting zero
1852 * works. There is no need to check if set_alt() is not NULL
1853 * as we check this in usb_add_function().
1854 */
1855 if (w_value && !f->get_alt)
1856 break;
1857
1858 spin_lock(&cdev->lock);
1859 value = f->set_alt(f, w_index, w_value);
1860 if (value == USB_GADGET_DELAYED_STATUS) {
1861 DBG(cdev,
1862 "%s: interface %d (%s) requested delayed status\n",
1863 __func__, intf, f->name);
1864 cdev->delayed_status++;
1865 DBG(cdev, "delayed_status count %d\n",
1866 cdev->delayed_status);
1867 }
1868 spin_unlock(&cdev->lock);
1869 break;
1870 case USB_REQ_GET_INTERFACE:
1871 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
1872 goto unknown;
1873 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1874 break;
1875 f = cdev->config->interface[intf];
1876 if (!f)
1877 break;
1878 /* lots of interfaces only need altsetting zero... */
1879 value = f->get_alt ? f->get_alt(f, w_index) : 0;
1880 if (value < 0)
1881 break;
1882 *((u8 *)req->buf) = value;
1883 value = min(w_length, (u16) 1);
1884 break;
1885 case USB_REQ_GET_STATUS:
1886 if (gadget_is_otg(gadget) && gadget->hnp_polling_support &&
1887 (w_index == OTG_STS_SELECTOR)) {
1888 if (ctrl->bRequestType != (USB_DIR_IN |
1889 USB_RECIP_DEVICE))
1890 goto unknown;
1891 *((u8 *)req->buf) = gadget->host_request_flag;
1892 value = 1;
1893 break;
1894 }
1895
1896 /*
1897 * USB 3.0 additions:
1898 * Function driver should handle get_status request. If such cb
1899 * wasn't supplied we respond with default value = 0
1900 * Note: function driver should supply such cb only for the
1901 * first interface of the function
1902 */
1903 if (!gadget_is_superspeed(gadget))
1904 goto unknown;
1905 if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
1906 goto unknown;
1907 value = 2; /* This is the length of the get_status reply */
1908 put_unaligned_le16(0, req->buf);
1909 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1910 break;
1911 f = cdev->config->interface[intf];
1912 if (!f)
1913 break;
1914 status = f->get_status ? f->get_status(f) : 0;
1915 if (status < 0)
1916 break;
1917 put_unaligned_le16(status & 0x0000ffff, req->buf);
1918 break;
1919 /*
1920 * Function drivers should handle SetFeature/ClearFeature
1921 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
1922 * only for the first interface of the function
1923 */
1924 case USB_REQ_CLEAR_FEATURE:
1925 case USB_REQ_SET_FEATURE:
1926 if (!gadget_is_superspeed(gadget))
1927 goto unknown;
1928 if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE))
1929 goto unknown;
1930 switch (w_value) {
1931 case USB_INTRF_FUNC_SUSPEND:
1932 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1933 break;
1934 f = cdev->config->interface[intf];
1935 if (!f)
1936 break;
1937 value = 0;
1938 if (f->func_suspend)
1939 value = f->func_suspend(f, w_index >> 8);
1940 if (value < 0) {
1941 ERROR(cdev,
1942 "func_suspend() returned error %d\n",
1943 value);
1944 value = 0;
1945 }
1946 break;
1947 }
1948 break;
1949 default:
1950 unknown:
1951 /*
1952 * OS descriptors handling
1953 */
1954 if (cdev->use_os_string && cdev->os_desc_config &&
1955 (ctrl->bRequestType & USB_TYPE_VENDOR) &&
1956 ctrl->bRequest == cdev->b_vendor_code) {
1957 struct usb_configuration *os_desc_cfg;
1958 u8 *buf;
1959 int interface;
1960 int count = 0;
1961
1962 req = cdev->os_desc_req;
1963 req->context = cdev;
1964 req->complete = composite_setup_complete;
1965 buf = req->buf;
1966 os_desc_cfg = cdev->os_desc_config;
1967 w_length = min_t(u16, w_length, USB_COMP_EP0_OS_DESC_BUFSIZ);
1968 memset(buf, 0, w_length);
1969 buf[5] = 0x01;
1970 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1971 case USB_RECIP_DEVICE:
1972 if (w_index != 0x4 || (w_value >> 8))
1973 break;
1974 buf[6] = w_index;
1975 /* Number of ext compat interfaces */
1976 count = count_ext_compat(os_desc_cfg);
1977 buf[8] = count;
1978 count *= 24; /* 24 B/ext compat desc */
1979 count += 16; /* header */
1980 put_unaligned_le32(count, buf);
1981 value = w_length;
1982 if (w_length > 0x10) {
1983 value = fill_ext_compat(os_desc_cfg, buf);
1984 value = min_t(u16, w_length, value);
1985 }
1986 break;
1987 case USB_RECIP_INTERFACE:
1988 if (w_index != 0x5 || (w_value >> 8))
1989 break;
1990 interface = w_value & 0xFF;
1991 if (interface >= MAX_CONFIG_INTERFACES ||
1992 !os_desc_cfg->interface[interface])
1993 break;
1994 buf[6] = w_index;
1995 count = count_ext_prop(os_desc_cfg,
1996 interface);
1997 put_unaligned_le16(count, buf + 8);
1998 count = len_ext_prop(os_desc_cfg,
1999 interface);
2000 put_unaligned_le32(count, buf);
2001 value = w_length;
2002 if (w_length > 0x0A) {
2003 value = fill_ext_prop(os_desc_cfg,
2004 interface, buf);
2005 if (value >= 0)
2006 value = min_t(u16, w_length, value);
2007 }
2008 break;
2009 }
2010
2011 goto check_value;
2012 }
2013
2014 VDBG(cdev,
2015 "non-core control req%02x.%02x v%04x i%04x l%d\n",
2016 ctrl->bRequestType, ctrl->bRequest,
2017 w_value, w_index, w_length);
2018
2019 /* functions always handle their interfaces and endpoints...
2020 * punt other recipients (other, WUSB, ...) to the current
2021 * configuration code.
2022 */
2023 if (cdev->config) {
2024 list_for_each_entry(f, &cdev->config->functions, list)
2025 if (f->req_match &&
2026 f->req_match(f, ctrl, false))
2027 goto try_fun_setup;
2028 } else {
2029 struct usb_configuration *c;
2030 list_for_each_entry(c, &cdev->configs, list)
2031 list_for_each_entry(f, &c->functions, list)
2032 if (f->req_match &&
2033 f->req_match(f, ctrl, true))
2034 goto try_fun_setup;
2035 }
2036 f = NULL;
2037
2038 switch (ctrl->bRequestType & USB_RECIP_MASK) {
2039 case USB_RECIP_INTERFACE:
2040 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
2041 break;
2042 f = cdev->config->interface[intf];
2043 break;
2044
2045 case USB_RECIP_ENDPOINT:
2046 if (!cdev->config)
2047 break;
2048 endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f);
2049 list_for_each_entry(f, &cdev->config->functions, list) {
2050 if (test_bit(endp, f->endpoints))
2051 break;
2052 }
2053 if (&f->list == &cdev->config->functions)
2054 f = NULL;
2055 break;
2056 }
2057 try_fun_setup:
2058 if (f && f->setup)
2059 value = f->setup(f, ctrl);
2060 else {
2061 struct usb_configuration *c;
2062
2063 c = cdev->config;
2064 if (!c)
2065 goto done;
2066
2067 /* try current config's setup */
2068 if (c->setup) {
2069 value = c->setup(c, ctrl);
2070 goto done;
2071 }
2072
2073 /* try the only function in the current config */
2074 if (!list_is_singular(&c->functions))
2075 goto done;
2076 f = list_first_entry(&c->functions, struct usb_function,
2077 list);
2078 if (f->setup)
2079 value = f->setup(f, ctrl);
2080 }
2081
2082 goto done;
2083 }
2084
2085 check_value:
2086 /* respond with data transfer before status phase? */
2087 if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) {
2088 req->length = value;
2089 req->context = cdev;
2090 req->zero = value < w_length;
2091 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2092 if (value < 0) {
2093 DBG(cdev, "ep_queue --> %d\n", value);
2094 req->status = 0;
2095 composite_setup_complete(gadget->ep0, req);
2096 }
2097 } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) {
2098 WARN(cdev,
2099 "%s: Delayed status not supported for w_length != 0",
2100 __func__);
2101 }
2102
2103 done:
2104 /* device either stalls (value < 0) or reports success */
2105 return value;
2106 }
2107
__composite_disconnect(struct usb_gadget * gadget)2108 static void __composite_disconnect(struct usb_gadget *gadget)
2109 {
2110 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2111 unsigned long flags;
2112
2113 /* REVISIT: should we have config and device level
2114 * disconnect callbacks?
2115 */
2116 spin_lock_irqsave(&cdev->lock, flags);
2117 cdev->suspended = 0;
2118 if (cdev->config)
2119 reset_config(cdev);
2120 if (cdev->driver->disconnect)
2121 cdev->driver->disconnect(cdev);
2122 spin_unlock_irqrestore(&cdev->lock, flags);
2123 }
2124
composite_disconnect(struct usb_gadget * gadget)2125 void composite_disconnect(struct usb_gadget *gadget)
2126 {
2127 usb_gadget_vbus_draw(gadget, 0);
2128 __composite_disconnect(gadget);
2129 }
2130
composite_reset(struct usb_gadget * gadget)2131 void composite_reset(struct usb_gadget *gadget)
2132 {
2133 /*
2134 * Section 1.4.13 Standard Downstream Port of the USB battery charging
2135 * specification v1.2 states that a device connected on a SDP shall only
2136 * draw at max 100mA while in a connected, but unconfigured state.
2137 */
2138 usb_gadget_vbus_draw(gadget, 100);
2139 __composite_disconnect(gadget);
2140 }
2141
2142 /*-------------------------------------------------------------------------*/
2143
suspended_show(struct device * dev,struct device_attribute * attr,char * buf)2144 static ssize_t suspended_show(struct device *dev, struct device_attribute *attr,
2145 char *buf)
2146 {
2147 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
2148 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2149
2150 return sprintf(buf, "%d\n", cdev->suspended);
2151 }
2152 static DEVICE_ATTR_RO(suspended);
2153
__composite_unbind(struct usb_gadget * gadget,bool unbind_driver)2154 static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
2155 {
2156 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2157 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2158 struct usb_string *dev_str = gstr->strings;
2159
2160 /* composite_disconnect() must already have been called
2161 * by the underlying peripheral controller driver!
2162 * so there's no i/o concurrency that could affect the
2163 * state protected by cdev->lock.
2164 */
2165 WARN_ON(cdev->config);
2166
2167 while (!list_empty(&cdev->configs)) {
2168 struct usb_configuration *c;
2169 c = list_first_entry(&cdev->configs,
2170 struct usb_configuration, list);
2171 remove_config(cdev, c);
2172 }
2173 if (cdev->driver->unbind && unbind_driver)
2174 cdev->driver->unbind(cdev);
2175
2176 composite_dev_cleanup(cdev);
2177
2178 if (dev_str[USB_GADGET_MANUFACTURER_IDX].s == cdev->def_manufacturer)
2179 dev_str[USB_GADGET_MANUFACTURER_IDX].s = "";
2180
2181 kfree(cdev->def_manufacturer);
2182 kfree(cdev);
2183 set_gadget_data(gadget, NULL);
2184 }
2185
composite_unbind(struct usb_gadget * gadget)2186 static void composite_unbind(struct usb_gadget *gadget)
2187 {
2188 __composite_unbind(gadget, true);
2189 }
2190
update_unchanged_dev_desc(struct usb_device_descriptor * new,const struct usb_device_descriptor * old)2191 static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
2192 const struct usb_device_descriptor *old)
2193 {
2194 __le16 idVendor;
2195 __le16 idProduct;
2196 __le16 bcdDevice;
2197 u8 iSerialNumber;
2198 u8 iManufacturer;
2199 u8 iProduct;
2200
2201 /*
2202 * these variables may have been set in
2203 * usb_composite_overwrite_options()
2204 */
2205 idVendor = new->idVendor;
2206 idProduct = new->idProduct;
2207 bcdDevice = new->bcdDevice;
2208 iSerialNumber = new->iSerialNumber;
2209 iManufacturer = new->iManufacturer;
2210 iProduct = new->iProduct;
2211
2212 *new = *old;
2213 if (idVendor)
2214 new->idVendor = idVendor;
2215 if (idProduct)
2216 new->idProduct = idProduct;
2217 if (bcdDevice)
2218 new->bcdDevice = bcdDevice;
2219 else
2220 new->bcdDevice = cpu_to_le16(get_default_bcdDevice());
2221 if (iSerialNumber)
2222 new->iSerialNumber = iSerialNumber;
2223 if (iManufacturer)
2224 new->iManufacturer = iManufacturer;
2225 if (iProduct)
2226 new->iProduct = iProduct;
2227 }
2228
composite_dev_prepare(struct usb_composite_driver * composite,struct usb_composite_dev * cdev)2229 int composite_dev_prepare(struct usb_composite_driver *composite,
2230 struct usb_composite_dev *cdev)
2231 {
2232 struct usb_gadget *gadget = cdev->gadget;
2233 int ret = -ENOMEM;
2234
2235 /* preallocate control response and buffer */
2236 cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
2237 if (!cdev->req)
2238 return -ENOMEM;
2239
2240 cdev->req->buf = kzalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
2241 if (!cdev->req->buf)
2242 goto fail;
2243
2244 ret = device_create_file(&gadget->dev, &dev_attr_suspended);
2245 if (ret)
2246 goto fail_dev;
2247
2248 cdev->req->complete = composite_setup_complete;
2249 cdev->req->context = cdev;
2250 gadget->ep0->driver_data = cdev;
2251
2252 cdev->driver = composite;
2253
2254 /*
2255 * As per USB compliance update, a device that is actively drawing
2256 * more than 100mA from USB must report itself as bus-powered in
2257 * the GetStatus(DEVICE) call.
2258 */
2259 if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW)
2260 usb_gadget_set_selfpowered(gadget);
2261
2262 /* interface and string IDs start at zero via kzalloc.
2263 * we force endpoints to start unassigned; few controller
2264 * drivers will zero ep->driver_data.
2265 */
2266 usb_ep_autoconfig_reset(gadget);
2267 return 0;
2268 fail_dev:
2269 kfree(cdev->req->buf);
2270 fail:
2271 usb_ep_free_request(gadget->ep0, cdev->req);
2272 cdev->req = NULL;
2273 return ret;
2274 }
2275
composite_os_desc_req_prepare(struct usb_composite_dev * cdev,struct usb_ep * ep0)2276 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
2277 struct usb_ep *ep0)
2278 {
2279 int ret = 0;
2280
2281 cdev->os_desc_req = usb_ep_alloc_request(ep0, GFP_KERNEL);
2282 if (!cdev->os_desc_req) {
2283 ret = -ENOMEM;
2284 goto end;
2285 }
2286
2287 cdev->os_desc_req->buf = kmalloc(USB_COMP_EP0_OS_DESC_BUFSIZ,
2288 GFP_KERNEL);
2289 if (!cdev->os_desc_req->buf) {
2290 ret = -ENOMEM;
2291 usb_ep_free_request(ep0, cdev->os_desc_req);
2292 goto end;
2293 }
2294 cdev->os_desc_req->context = cdev;
2295 cdev->os_desc_req->complete = composite_setup_complete;
2296 end:
2297 return ret;
2298 }
2299
composite_dev_cleanup(struct usb_composite_dev * cdev)2300 void composite_dev_cleanup(struct usb_composite_dev *cdev)
2301 {
2302 struct usb_gadget_string_container *uc, *tmp;
2303 struct usb_ep *ep, *tmp_ep;
2304
2305 list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
2306 list_del(&uc->list);
2307 kfree(uc);
2308 }
2309 if (cdev->os_desc_req) {
2310 if (cdev->os_desc_pending)
2311 usb_ep_dequeue(cdev->gadget->ep0, cdev->os_desc_req);
2312
2313 kfree(cdev->os_desc_req->buf);
2314 cdev->os_desc_req->buf = NULL;
2315 usb_ep_free_request(cdev->gadget->ep0, cdev->os_desc_req);
2316 cdev->os_desc_req = NULL;
2317 }
2318 if (cdev->req) {
2319 if (cdev->setup_pending)
2320 usb_ep_dequeue(cdev->gadget->ep0, cdev->req);
2321
2322 kfree(cdev->req->buf);
2323 cdev->req->buf = NULL;
2324 usb_ep_free_request(cdev->gadget->ep0, cdev->req);
2325 cdev->req = NULL;
2326 }
2327 cdev->next_string_id = 0;
2328 device_remove_file(&cdev->gadget->dev, &dev_attr_suspended);
2329
2330 /*
2331 * Some UDC backends have a dynamic EP allocation scheme.
2332 *
2333 * In that case, the dispose() callback is used to notify the
2334 * backend that the EPs are no longer in use.
2335 *
2336 * Note: The UDC backend can remove the EP from the ep_list as
2337 * a result, so we need to use the _safe list iterator.
2338 */
2339 list_for_each_entry_safe(ep, tmp_ep,
2340 &cdev->gadget->ep_list, ep_list) {
2341 if (ep->ops->dispose)
2342 ep->ops->dispose(ep);
2343 }
2344 }
2345
composite_bind(struct usb_gadget * gadget,struct usb_gadget_driver * gdriver)2346 static int composite_bind(struct usb_gadget *gadget,
2347 struct usb_gadget_driver *gdriver)
2348 {
2349 struct usb_composite_dev *cdev;
2350 struct usb_composite_driver *composite = to_cdriver(gdriver);
2351 int status = -ENOMEM;
2352
2353 cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
2354 if (!cdev)
2355 return status;
2356
2357 spin_lock_init(&cdev->lock);
2358 cdev->gadget = gadget;
2359 set_gadget_data(gadget, cdev);
2360 INIT_LIST_HEAD(&cdev->configs);
2361 INIT_LIST_HEAD(&cdev->gstrings);
2362
2363 status = composite_dev_prepare(composite, cdev);
2364 if (status)
2365 goto fail;
2366
2367 /* composite gadget needs to assign strings for whole device (like
2368 * serial number), register function drivers, potentially update
2369 * power state and consumption, etc
2370 */
2371 status = composite->bind(cdev);
2372 if (status < 0)
2373 goto fail;
2374
2375 if (cdev->use_os_string) {
2376 status = composite_os_desc_req_prepare(cdev, gadget->ep0);
2377 if (status)
2378 goto fail;
2379 }
2380
2381 update_unchanged_dev_desc(&cdev->desc, composite->dev);
2382
2383 /* has userspace failed to provide a serial number? */
2384 if (composite->needs_serial && !cdev->desc.iSerialNumber)
2385 WARNING(cdev, "userspace failed to provide iSerialNumber\n");
2386
2387 INFO(cdev, "%s ready\n", composite->name);
2388 return 0;
2389
2390 fail:
2391 __composite_unbind(gadget, false);
2392 return status;
2393 }
2394
2395 /*-------------------------------------------------------------------------*/
2396
composite_suspend(struct usb_gadget * gadget)2397 void composite_suspend(struct usb_gadget *gadget)
2398 {
2399 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2400 struct usb_function *f;
2401
2402 /* REVISIT: should we have config level
2403 * suspend/resume callbacks?
2404 */
2405 DBG(cdev, "suspend\n");
2406 if (cdev->config) {
2407 list_for_each_entry(f, &cdev->config->functions, list) {
2408 if (f->suspend)
2409 f->suspend(f);
2410 }
2411 }
2412 if (cdev->driver->suspend)
2413 cdev->driver->suspend(cdev);
2414
2415 cdev->suspended = 1;
2416
2417 usb_gadget_set_selfpowered(gadget);
2418 usb_gadget_vbus_draw(gadget, 2);
2419 }
2420
composite_resume(struct usb_gadget * gadget)2421 void composite_resume(struct usb_gadget *gadget)
2422 {
2423 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2424 struct usb_function *f;
2425 unsigned maxpower;
2426
2427 /* REVISIT: should we have config level
2428 * suspend/resume callbacks?
2429 */
2430 DBG(cdev, "resume\n");
2431 if (cdev->driver->resume)
2432 cdev->driver->resume(cdev);
2433 if (cdev->config) {
2434 list_for_each_entry(f, &cdev->config->functions, list) {
2435 if (f->resume)
2436 f->resume(f);
2437 }
2438
2439 maxpower = cdev->config->MaxPower ?
2440 cdev->config->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
2441 if (gadget->speed < USB_SPEED_SUPER)
2442 maxpower = min(maxpower, 500U);
2443 else
2444 maxpower = min(maxpower, 900U);
2445
2446 if (maxpower > USB_SELF_POWER_VBUS_MAX_DRAW)
2447 usb_gadget_clear_selfpowered(gadget);
2448
2449 usb_gadget_vbus_draw(gadget, maxpower);
2450 } else {
2451 maxpower = CONFIG_USB_GADGET_VBUS_DRAW;
2452 maxpower = min(maxpower, 100U);
2453 usb_gadget_vbus_draw(gadget, maxpower);
2454 }
2455
2456 cdev->suspended = 0;
2457 }
2458
2459 /*-------------------------------------------------------------------------*/
2460
2461 static const struct usb_gadget_driver composite_driver_template = {
2462 .bind = composite_bind,
2463 .unbind = composite_unbind,
2464
2465 .setup = composite_setup,
2466 .reset = composite_reset,
2467 .disconnect = composite_disconnect,
2468
2469 .suspend = composite_suspend,
2470 .resume = composite_resume,
2471
2472 .driver = {
2473 .owner = THIS_MODULE,
2474 },
2475 };
2476
2477 /**
2478 * usb_composite_probe() - register a composite driver
2479 * @driver: the driver to register
2480 *
2481 * Context: single threaded during gadget setup
2482 *
2483 * This function is used to register drivers using the composite driver
2484 * framework. The return value is zero, or a negative errno value.
2485 * Those values normally come from the driver's @bind method, which does
2486 * all the work of setting up the driver to match the hardware.
2487 *
2488 * On successful return, the gadget is ready to respond to requests from
2489 * the host, unless one of its components invokes usb_gadget_disconnect()
2490 * while it was binding. That would usually be done in order to wait for
2491 * some userspace participation.
2492 */
usb_composite_probe(struct usb_composite_driver * driver)2493 int usb_composite_probe(struct usb_composite_driver *driver)
2494 {
2495 struct usb_gadget_driver *gadget_driver;
2496
2497 if (!driver || !driver->dev || !driver->bind)
2498 return -EINVAL;
2499
2500 if (!driver->name)
2501 driver->name = "composite";
2502
2503 driver->gadget_driver = composite_driver_template;
2504 gadget_driver = &driver->gadget_driver;
2505
2506 gadget_driver->function = (char *) driver->name;
2507 gadget_driver->driver.name = driver->name;
2508 gadget_driver->max_speed = driver->max_speed;
2509
2510 return usb_gadget_probe_driver(gadget_driver);
2511 }
2512 EXPORT_SYMBOL_GPL(usb_composite_probe);
2513
2514 /**
2515 * usb_composite_unregister() - unregister a composite driver
2516 * @driver: the driver to unregister
2517 *
2518 * This function is used to unregister drivers using the composite
2519 * driver framework.
2520 */
usb_composite_unregister(struct usb_composite_driver * driver)2521 void usb_composite_unregister(struct usb_composite_driver *driver)
2522 {
2523 usb_gadget_unregister_driver(&driver->gadget_driver);
2524 }
2525 EXPORT_SYMBOL_GPL(usb_composite_unregister);
2526
2527 /**
2528 * usb_composite_setup_continue() - Continue with the control transfer
2529 * @cdev: the composite device who's control transfer was kept waiting
2530 *
2531 * This function must be called by the USB function driver to continue
2532 * with the control transfer's data/status stage in case it had requested to
2533 * delay the data/status stages. A USB function's setup handler (e.g. set_alt())
2534 * can request the composite framework to delay the setup request's data/status
2535 * stages by returning USB_GADGET_DELAYED_STATUS.
2536 */
usb_composite_setup_continue(struct usb_composite_dev * cdev)2537 void usb_composite_setup_continue(struct usb_composite_dev *cdev)
2538 {
2539 int value;
2540 struct usb_request *req = cdev->req;
2541 unsigned long flags;
2542
2543 DBG(cdev, "%s\n", __func__);
2544 spin_lock_irqsave(&cdev->lock, flags);
2545
2546 if (cdev->delayed_status == 0) {
2547 WARN(cdev, "%s: Unexpected call\n", __func__);
2548
2549 } else if (--cdev->delayed_status == 0) {
2550 DBG(cdev, "%s: Completing delayed status\n", __func__);
2551 req->length = 0;
2552 req->context = cdev;
2553 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2554 if (value < 0) {
2555 DBG(cdev, "ep_queue --> %d\n", value);
2556 req->status = 0;
2557 composite_setup_complete(cdev->gadget->ep0, req);
2558 }
2559 }
2560
2561 spin_unlock_irqrestore(&cdev->lock, flags);
2562 }
2563 EXPORT_SYMBOL_GPL(usb_composite_setup_continue);
2564
composite_default_mfr(struct usb_gadget * gadget)2565 static char *composite_default_mfr(struct usb_gadget *gadget)
2566 {
2567 return kasprintf(GFP_KERNEL, "%s %s with %s", init_utsname()->sysname,
2568 init_utsname()->release, gadget->name);
2569 }
2570
usb_composite_overwrite_options(struct usb_composite_dev * cdev,struct usb_composite_overwrite * covr)2571 void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
2572 struct usb_composite_overwrite *covr)
2573 {
2574 struct usb_device_descriptor *desc = &cdev->desc;
2575 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2576 struct usb_string *dev_str = gstr->strings;
2577
2578 if (covr->idVendor)
2579 desc->idVendor = cpu_to_le16(covr->idVendor);
2580
2581 if (covr->idProduct)
2582 desc->idProduct = cpu_to_le16(covr->idProduct);
2583
2584 if (covr->bcdDevice)
2585 desc->bcdDevice = cpu_to_le16(covr->bcdDevice);
2586
2587 if (covr->serial_number) {
2588 desc->iSerialNumber = dev_str[USB_GADGET_SERIAL_IDX].id;
2589 dev_str[USB_GADGET_SERIAL_IDX].s = covr->serial_number;
2590 }
2591 if (covr->manufacturer) {
2592 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2593 dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer;
2594
2595 } else if (!strlen(dev_str[USB_GADGET_MANUFACTURER_IDX].s)) {
2596 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2597 cdev->def_manufacturer = composite_default_mfr(cdev->gadget);
2598 dev_str[USB_GADGET_MANUFACTURER_IDX].s = cdev->def_manufacturer;
2599 }
2600
2601 if (covr->product) {
2602 desc->iProduct = dev_str[USB_GADGET_PRODUCT_IDX].id;
2603 dev_str[USB_GADGET_PRODUCT_IDX].s = covr->product;
2604 }
2605 }
2606 EXPORT_SYMBOL_GPL(usb_composite_overwrite_options);
2607
2608 MODULE_LICENSE("GPL");
2609 MODULE_AUTHOR("David Brownell");
2610