1 /*
2 * composite.c - infrastructure for Composite USB Gadgets
3 *
4 * Copyright (C) 2006-2008 David Brownell
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 /* #define VERBOSE_DEBUG */
13
14 #include <linux/kallsyms.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/device.h>
19 #include <linux/utsname.h>
20
21 #include <linux/usb/composite.h>
22 #include <linux/usb/otg.h>
23 #include <asm/unaligned.h>
24
25 #include "u_os_desc.h"
26
27 /**
28 * struct usb_os_string - represents OS String to be reported by a gadget
29 * @bLength: total length of the entire descritor, always 0x12
30 * @bDescriptorType: USB_DT_STRING
31 * @qwSignature: the OS String proper
32 * @bMS_VendorCode: code used by the host for subsequent requests
33 * @bPad: not used, must be zero
34 */
35 struct usb_os_string {
36 __u8 bLength;
37 __u8 bDescriptorType;
38 __u8 qwSignature[OS_STRING_QW_SIGN_LEN];
39 __u8 bMS_VendorCode;
40 __u8 bPad;
41 } __packed;
42
43 /*
44 * The code in this file is utility code, used to build a gadget driver
45 * from one or more "function" drivers, one or more "configuration"
46 * objects, and a "usb_composite_driver" by gluing them together along
47 * with the relevant device-wide data.
48 */
49
get_containers_gs(struct usb_gadget_string_container * uc)50 static struct usb_gadget_strings **get_containers_gs(
51 struct usb_gadget_string_container *uc)
52 {
53 return (struct usb_gadget_strings **)uc->stash;
54 }
55
56 /**
57 * next_ep_desc() - advance to the next EP descriptor
58 * @t: currect pointer within descriptor array
59 *
60 * Return: next EP descriptor or NULL
61 *
62 * Iterate over @t until either EP descriptor found or
63 * NULL (that indicates end of list) encountered
64 */
65 static struct usb_descriptor_header**
next_ep_desc(struct usb_descriptor_header ** t)66 next_ep_desc(struct usb_descriptor_header **t)
67 {
68 for (; *t; t++) {
69 if ((*t)->bDescriptorType == USB_DT_ENDPOINT)
70 return t;
71 }
72 return NULL;
73 }
74
75 /*
76 * for_each_ep_desc()- iterate over endpoint descriptors in the
77 * descriptors list
78 * @start: pointer within descriptor array.
79 * @ep_desc: endpoint descriptor to use as the loop cursor
80 */
81 #define for_each_ep_desc(start, ep_desc) \
82 for (ep_desc = next_ep_desc(start); \
83 ep_desc; ep_desc = next_ep_desc(ep_desc+1))
84
85 /**
86 * config_ep_by_speed() - configures the given endpoint
87 * according to gadget speed.
88 * @g: pointer to the gadget
89 * @f: usb function
90 * @_ep: the endpoint to configure
91 *
92 * Return: error code, 0 on success
93 *
94 * This function chooses the right descriptors for a given
95 * endpoint according to gadget speed and saves it in the
96 * endpoint desc field. If the endpoint already has a descriptor
97 * assigned to it - overwrites it with currently corresponding
98 * descriptor. The endpoint maxpacket field is updated according
99 * to the chosen descriptor.
100 * Note: the supplied function should hold all the descriptors
101 * for supported speeds
102 */
config_ep_by_speed(struct usb_gadget * g,struct usb_function * f,struct usb_ep * _ep)103 int config_ep_by_speed(struct usb_gadget *g,
104 struct usb_function *f,
105 struct usb_ep *_ep)
106 {
107 struct usb_endpoint_descriptor *chosen_desc = NULL;
108 struct usb_descriptor_header **speed_desc = NULL;
109
110 struct usb_ss_ep_comp_descriptor *comp_desc = NULL;
111 int want_comp_desc = 0;
112
113 struct usb_descriptor_header **d_spd; /* cursor for speed desc */
114
115 if (!g || !f || !_ep)
116 return -EIO;
117
118 /* select desired speed */
119 switch (g->speed) {
120 case USB_SPEED_SUPER:
121 if (gadget_is_superspeed(g)) {
122 speed_desc = f->ss_descriptors;
123 want_comp_desc = 1;
124 break;
125 }
126 /* else: Fall trough */
127 case USB_SPEED_HIGH:
128 if (gadget_is_dualspeed(g)) {
129 speed_desc = f->hs_descriptors;
130 break;
131 }
132 /* else: fall through */
133 default:
134 speed_desc = f->fs_descriptors;
135 }
136 /* find descriptors */
137 for_each_ep_desc(speed_desc, d_spd) {
138 chosen_desc = (struct usb_endpoint_descriptor *)*d_spd;
139 if (chosen_desc->bEndpointAddress == _ep->address)
140 goto ep_found;
141 }
142 return -EIO;
143
144 ep_found:
145 /* commit results */
146 _ep->maxpacket = usb_endpoint_maxp(chosen_desc) & 0x7ff;
147 _ep->desc = chosen_desc;
148 _ep->comp_desc = NULL;
149 _ep->maxburst = 0;
150 _ep->mult = 1;
151
152 if (g->speed == USB_SPEED_HIGH && (usb_endpoint_xfer_isoc(_ep->desc) ||
153 usb_endpoint_xfer_int(_ep->desc)))
154 _ep->mult = ((usb_endpoint_maxp(_ep->desc) & 0x1800) >> 11) + 1;
155
156 if (!want_comp_desc)
157 return 0;
158
159 /*
160 * Companion descriptor should follow EP descriptor
161 * USB 3.0 spec, #9.6.7
162 */
163 comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd);
164 if (!comp_desc ||
165 (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP))
166 return -EIO;
167 _ep->comp_desc = comp_desc;
168 if (g->speed == USB_SPEED_SUPER) {
169 switch (usb_endpoint_type(_ep->desc)) {
170 case USB_ENDPOINT_XFER_ISOC:
171 /* mult: bits 1:0 of bmAttributes */
172 _ep->mult = (comp_desc->bmAttributes & 0x3) + 1;
173 case USB_ENDPOINT_XFER_BULK:
174 case USB_ENDPOINT_XFER_INT:
175 _ep->maxburst = comp_desc->bMaxBurst + 1;
176 break;
177 default:
178 if (comp_desc->bMaxBurst != 0) {
179 struct usb_composite_dev *cdev;
180
181 cdev = get_gadget_data(g);
182 ERROR(cdev, "ep0 bMaxBurst must be 0\n");
183 }
184 _ep->maxburst = 1;
185 break;
186 }
187 }
188 return 0;
189 }
190 EXPORT_SYMBOL_GPL(config_ep_by_speed);
191
192 /**
193 * usb_add_function() - add a function to a configuration
194 * @config: the configuration
195 * @function: the function being added
196 * Context: single threaded during gadget setup
197 *
198 * After initialization, each configuration must have one or more
199 * functions added to it. Adding a function involves calling its @bind()
200 * method to allocate resources such as interface and string identifiers
201 * and endpoints.
202 *
203 * This function returns the value of the function's bind(), which is
204 * zero for success else a negative errno value.
205 */
usb_add_function(struct usb_configuration * config,struct usb_function * function)206 int usb_add_function(struct usb_configuration *config,
207 struct usb_function *function)
208 {
209 int value = -EINVAL;
210
211 DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n",
212 function->name, function,
213 config->label, config);
214
215 if (!function->set_alt || !function->disable)
216 goto done;
217
218 function->config = config;
219 list_add_tail(&function->list, &config->functions);
220
221 if (function->bind_deactivated) {
222 value = usb_function_deactivate(function);
223 if (value)
224 goto done;
225 }
226
227 /* REVISIT *require* function->bind? */
228 if (function->bind) {
229 value = function->bind(config, function);
230 if (value < 0) {
231 list_del(&function->list);
232 function->config = NULL;
233 }
234 } else
235 value = 0;
236
237 /* We allow configurations that don't work at both speeds.
238 * If we run into a lowspeed Linux system, treat it the same
239 * as full speed ... it's the function drivers that will need
240 * to avoid bulk and ISO transfers.
241 */
242 if (!config->fullspeed && function->fs_descriptors)
243 config->fullspeed = true;
244 if (!config->highspeed && function->hs_descriptors)
245 config->highspeed = true;
246 if (!config->superspeed && function->ss_descriptors)
247 config->superspeed = true;
248
249 done:
250 if (value)
251 DBG(config->cdev, "adding '%s'/%p --> %d\n",
252 function->name, function, value);
253 return value;
254 }
255 EXPORT_SYMBOL_GPL(usb_add_function);
256
usb_remove_function(struct usb_configuration * c,struct usb_function * f)257 void usb_remove_function(struct usb_configuration *c, struct usb_function *f)
258 {
259 if (f->disable)
260 f->disable(f);
261
262 bitmap_zero(f->endpoints, 32);
263 list_del(&f->list);
264 if (f->unbind)
265 f->unbind(c, f);
266 }
267 EXPORT_SYMBOL_GPL(usb_remove_function);
268
269 /**
270 * usb_function_deactivate - prevent function and gadget enumeration
271 * @function: the function that isn't yet ready to respond
272 *
273 * Blocks response of the gadget driver to host enumeration by
274 * preventing the data line pullup from being activated. This is
275 * normally called during @bind() processing to change from the
276 * initial "ready to respond" state, or when a required resource
277 * becomes available.
278 *
279 * For example, drivers that serve as a passthrough to a userspace
280 * daemon can block enumeration unless that daemon (such as an OBEX,
281 * MTP, or print server) is ready to handle host requests.
282 *
283 * Not all systems support software control of their USB peripheral
284 * data pullups.
285 *
286 * Returns zero on success, else negative errno.
287 */
usb_function_deactivate(struct usb_function * function)288 int usb_function_deactivate(struct usb_function *function)
289 {
290 struct usb_composite_dev *cdev = function->config->cdev;
291 unsigned long flags;
292 int status = 0;
293
294 spin_lock_irqsave(&cdev->lock, flags);
295
296 if (cdev->deactivations == 0) {
297 spin_unlock_irqrestore(&cdev->lock, flags);
298 status = usb_gadget_deactivate(cdev->gadget);
299 spin_lock_irqsave(&cdev->lock, flags);
300 }
301 if (status == 0)
302 cdev->deactivations++;
303
304 spin_unlock_irqrestore(&cdev->lock, flags);
305 return status;
306 }
307 EXPORT_SYMBOL_GPL(usb_function_deactivate);
308
309 /**
310 * usb_function_activate - allow function and gadget enumeration
311 * @function: function on which usb_function_activate() was called
312 *
313 * Reverses effect of usb_function_deactivate(). If no more functions
314 * are delaying their activation, the gadget driver will respond to
315 * host enumeration procedures.
316 *
317 * Returns zero on success, else negative errno.
318 */
usb_function_activate(struct usb_function * function)319 int usb_function_activate(struct usb_function *function)
320 {
321 struct usb_composite_dev *cdev = function->config->cdev;
322 unsigned long flags;
323 int status = 0;
324
325 spin_lock_irqsave(&cdev->lock, flags);
326
327 if (WARN_ON(cdev->deactivations == 0))
328 status = -EINVAL;
329 else {
330 cdev->deactivations--;
331 if (cdev->deactivations == 0) {
332 spin_unlock_irqrestore(&cdev->lock, flags);
333 status = usb_gadget_activate(cdev->gadget);
334 spin_lock_irqsave(&cdev->lock, flags);
335 }
336 }
337
338 spin_unlock_irqrestore(&cdev->lock, flags);
339 return status;
340 }
341 EXPORT_SYMBOL_GPL(usb_function_activate);
342
343 /**
344 * usb_interface_id() - allocate an unused interface ID
345 * @config: configuration associated with the interface
346 * @function: function handling the interface
347 * Context: single threaded during gadget setup
348 *
349 * usb_interface_id() is called from usb_function.bind() callbacks to
350 * allocate new interface IDs. The function driver will then store that
351 * ID in interface, association, CDC union, and other descriptors. It
352 * will also handle any control requests targeted at that interface,
353 * particularly changing its altsetting via set_alt(). There may
354 * also be class-specific or vendor-specific requests to handle.
355 *
356 * All interface identifier should be allocated using this routine, to
357 * ensure that for example different functions don't wrongly assign
358 * different meanings to the same identifier. Note that since interface
359 * identifiers are configuration-specific, functions used in more than
360 * one configuration (or more than once in a given configuration) need
361 * multiple versions of the relevant descriptors.
362 *
363 * Returns the interface ID which was allocated; or -ENODEV if no
364 * more interface IDs can be allocated.
365 */
usb_interface_id(struct usb_configuration * config,struct usb_function * function)366 int usb_interface_id(struct usb_configuration *config,
367 struct usb_function *function)
368 {
369 unsigned id = config->next_interface_id;
370
371 if (id < MAX_CONFIG_INTERFACES) {
372 config->interface[id] = function;
373 config->next_interface_id = id + 1;
374 return id;
375 }
376 return -ENODEV;
377 }
378 EXPORT_SYMBOL_GPL(usb_interface_id);
379
encode_bMaxPower(enum usb_device_speed speed,struct usb_configuration * c)380 static u8 encode_bMaxPower(enum usb_device_speed speed,
381 struct usb_configuration *c)
382 {
383 unsigned val;
384
385 if (c->MaxPower)
386 val = c->MaxPower;
387 else
388 val = CONFIG_USB_GADGET_VBUS_DRAW;
389 if (!val)
390 return 0;
391 switch (speed) {
392 case USB_SPEED_SUPER:
393 return DIV_ROUND_UP(val, 8);
394 default:
395 return DIV_ROUND_UP(val, 2);
396 }
397 }
398
config_buf(struct usb_configuration * config,enum usb_device_speed speed,void * buf,u8 type)399 static int config_buf(struct usb_configuration *config,
400 enum usb_device_speed speed, void *buf, u8 type)
401 {
402 struct usb_config_descriptor *c = buf;
403 void *next = buf + USB_DT_CONFIG_SIZE;
404 int len;
405 struct usb_function *f;
406 int status;
407
408 len = USB_COMP_EP0_BUFSIZ - USB_DT_CONFIG_SIZE;
409 /* write the config descriptor */
410 c = buf;
411 c->bLength = USB_DT_CONFIG_SIZE;
412 c->bDescriptorType = type;
413 /* wTotalLength is written later */
414 c->bNumInterfaces = config->next_interface_id;
415 c->bConfigurationValue = config->bConfigurationValue;
416 c->iConfiguration = config->iConfiguration;
417 c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes;
418 c->bMaxPower = encode_bMaxPower(speed, config);
419
420 /* There may be e.g. OTG descriptors */
421 if (config->descriptors) {
422 status = usb_descriptor_fillbuf(next, len,
423 config->descriptors);
424 if (status < 0)
425 return status;
426 len -= status;
427 next += status;
428 }
429
430 /* add each function's descriptors */
431 list_for_each_entry(f, &config->functions, list) {
432 struct usb_descriptor_header **descriptors;
433
434 switch (speed) {
435 case USB_SPEED_SUPER:
436 descriptors = f->ss_descriptors;
437 break;
438 case USB_SPEED_HIGH:
439 descriptors = f->hs_descriptors;
440 break;
441 default:
442 descriptors = f->fs_descriptors;
443 }
444
445 if (!descriptors)
446 continue;
447 status = usb_descriptor_fillbuf(next, len,
448 (const struct usb_descriptor_header **) descriptors);
449 if (status < 0)
450 return status;
451 len -= status;
452 next += status;
453 }
454
455 len = next - buf;
456 c->wTotalLength = cpu_to_le16(len);
457 return len;
458 }
459
config_desc(struct usb_composite_dev * cdev,unsigned w_value)460 static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
461 {
462 struct usb_gadget *gadget = cdev->gadget;
463 struct usb_configuration *c;
464 struct list_head *pos;
465 u8 type = w_value >> 8;
466 enum usb_device_speed speed = USB_SPEED_UNKNOWN;
467
468 if (gadget->speed == USB_SPEED_SUPER)
469 speed = gadget->speed;
470 else if (gadget_is_dualspeed(gadget)) {
471 int hs = 0;
472 if (gadget->speed == USB_SPEED_HIGH)
473 hs = 1;
474 if (type == USB_DT_OTHER_SPEED_CONFIG)
475 hs = !hs;
476 if (hs)
477 speed = USB_SPEED_HIGH;
478
479 }
480
481 /* This is a lookup by config *INDEX* */
482 w_value &= 0xff;
483
484 pos = &cdev->configs;
485 c = cdev->os_desc_config;
486 if (c)
487 goto check_config;
488
489 while ((pos = pos->next) != &cdev->configs) {
490 c = list_entry(pos, typeof(*c), list);
491
492 /* skip OS Descriptors config which is handled separately */
493 if (c == cdev->os_desc_config)
494 continue;
495
496 check_config:
497 /* ignore configs that won't work at this speed */
498 switch (speed) {
499 case USB_SPEED_SUPER:
500 if (!c->superspeed)
501 continue;
502 break;
503 case USB_SPEED_HIGH:
504 if (!c->highspeed)
505 continue;
506 break;
507 default:
508 if (!c->fullspeed)
509 continue;
510 }
511
512 if (w_value == 0)
513 return config_buf(c, speed, cdev->req->buf, type);
514 w_value--;
515 }
516 return -EINVAL;
517 }
518
count_configs(struct usb_composite_dev * cdev,unsigned type)519 static int count_configs(struct usb_composite_dev *cdev, unsigned type)
520 {
521 struct usb_gadget *gadget = cdev->gadget;
522 struct usb_configuration *c;
523 unsigned count = 0;
524 int hs = 0;
525 int ss = 0;
526
527 if (gadget_is_dualspeed(gadget)) {
528 if (gadget->speed == USB_SPEED_HIGH)
529 hs = 1;
530 if (gadget->speed == USB_SPEED_SUPER)
531 ss = 1;
532 if (type == USB_DT_DEVICE_QUALIFIER)
533 hs = !hs;
534 }
535 list_for_each_entry(c, &cdev->configs, list) {
536 /* ignore configs that won't work at this speed */
537 if (ss) {
538 if (!c->superspeed)
539 continue;
540 } else if (hs) {
541 if (!c->highspeed)
542 continue;
543 } else {
544 if (!c->fullspeed)
545 continue;
546 }
547 count++;
548 }
549 return count;
550 }
551
552 /**
553 * bos_desc() - prepares the BOS descriptor.
554 * @cdev: pointer to usb_composite device to generate the bos
555 * descriptor for
556 *
557 * This function generates the BOS (Binary Device Object)
558 * descriptor and its device capabilities descriptors. The BOS
559 * descriptor should be supported by a SuperSpeed device.
560 */
bos_desc(struct usb_composite_dev * cdev)561 static int bos_desc(struct usb_composite_dev *cdev)
562 {
563 struct usb_ext_cap_descriptor *usb_ext;
564 struct usb_ss_cap_descriptor *ss_cap;
565 struct usb_dcd_config_params dcd_config_params;
566 struct usb_bos_descriptor *bos = cdev->req->buf;
567
568 bos->bLength = USB_DT_BOS_SIZE;
569 bos->bDescriptorType = USB_DT_BOS;
570
571 bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
572 bos->bNumDeviceCaps = 0;
573
574 /*
575 * A SuperSpeed device shall include the USB2.0 extension descriptor
576 * and shall support LPM when operating in USB2.0 HS mode.
577 */
578 usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
579 bos->bNumDeviceCaps++;
580 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
581 usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
582 usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
583 usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
584 usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT | USB_BESL_SUPPORT);
585
586 /*
587 * The Superspeed USB Capability descriptor shall be implemented by all
588 * SuperSpeed devices.
589 */
590 ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
591 bos->bNumDeviceCaps++;
592 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
593 ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
594 ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
595 ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
596 ss_cap->bmAttributes = 0; /* LTM is not supported yet */
597 ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
598 USB_FULL_SPEED_OPERATION |
599 USB_HIGH_SPEED_OPERATION |
600 USB_5GBPS_OPERATION);
601 ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
602
603 /* Get Controller configuration */
604 if (cdev->gadget->ops->get_config_params)
605 cdev->gadget->ops->get_config_params(&dcd_config_params);
606 else {
607 dcd_config_params.bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT;
608 dcd_config_params.bU2DevExitLat =
609 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
610 }
611 ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
612 ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
613
614 return le16_to_cpu(bos->wTotalLength);
615 }
616
device_qual(struct usb_composite_dev * cdev)617 static void device_qual(struct usb_composite_dev *cdev)
618 {
619 struct usb_qualifier_descriptor *qual = cdev->req->buf;
620
621 qual->bLength = sizeof(*qual);
622 qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
623 /* POLICY: same bcdUSB and device type info at both speeds */
624 qual->bcdUSB = cdev->desc.bcdUSB;
625 qual->bDeviceClass = cdev->desc.bDeviceClass;
626 qual->bDeviceSubClass = cdev->desc.bDeviceSubClass;
627 qual->bDeviceProtocol = cdev->desc.bDeviceProtocol;
628 /* ASSUME same EP0 fifo size at both speeds */
629 qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket;
630 qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER);
631 qual->bRESERVED = 0;
632 }
633
634 /*-------------------------------------------------------------------------*/
635
reset_config(struct usb_composite_dev * cdev)636 static void reset_config(struct usb_composite_dev *cdev)
637 {
638 struct usb_function *f;
639
640 DBG(cdev, "reset config\n");
641
642 list_for_each_entry(f, &cdev->config->functions, list) {
643 if (f->disable)
644 f->disable(f);
645
646 bitmap_zero(f->endpoints, 32);
647 }
648 cdev->config = NULL;
649 cdev->delayed_status = 0;
650 }
651
set_config(struct usb_composite_dev * cdev,const struct usb_ctrlrequest * ctrl,unsigned number)652 static int set_config(struct usb_composite_dev *cdev,
653 const struct usb_ctrlrequest *ctrl, unsigned number)
654 {
655 struct usb_gadget *gadget = cdev->gadget;
656 struct usb_configuration *c = NULL;
657 int result = -EINVAL;
658 unsigned power = gadget_is_otg(gadget) ? 8 : 100;
659 int tmp;
660
661 if (number) {
662 list_for_each_entry(c, &cdev->configs, list) {
663 if (c->bConfigurationValue == number) {
664 /*
665 * We disable the FDs of the previous
666 * configuration only if the new configuration
667 * is a valid one
668 */
669 if (cdev->config)
670 reset_config(cdev);
671 result = 0;
672 break;
673 }
674 }
675 if (result < 0)
676 goto done;
677 } else { /* Zero configuration value - need to reset the config */
678 if (cdev->config)
679 reset_config(cdev);
680 result = 0;
681 }
682
683 INFO(cdev, "%s config #%d: %s\n",
684 usb_speed_string(gadget->speed),
685 number, c ? c->label : "unconfigured");
686
687 if (!c)
688 goto done;
689
690 usb_gadget_set_state(gadget, USB_STATE_CONFIGURED);
691 cdev->config = c;
692
693 /* Initialize all interfaces by setting them to altsetting zero. */
694 for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) {
695 struct usb_function *f = c->interface[tmp];
696 struct usb_descriptor_header **descriptors;
697
698 if (!f)
699 break;
700
701 /*
702 * Record which endpoints are used by the function. This is used
703 * to dispatch control requests targeted at that endpoint to the
704 * function's setup callback instead of the current
705 * configuration's setup callback.
706 */
707 switch (gadget->speed) {
708 case USB_SPEED_SUPER:
709 descriptors = f->ss_descriptors;
710 break;
711 case USB_SPEED_HIGH:
712 descriptors = f->hs_descriptors;
713 break;
714 default:
715 descriptors = f->fs_descriptors;
716 }
717
718 for (; *descriptors; ++descriptors) {
719 struct usb_endpoint_descriptor *ep;
720 int addr;
721
722 if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT)
723 continue;
724
725 ep = (struct usb_endpoint_descriptor *)*descriptors;
726 addr = ((ep->bEndpointAddress & 0x80) >> 3)
727 | (ep->bEndpointAddress & 0x0f);
728 set_bit(addr, f->endpoints);
729 }
730
731 result = f->set_alt(f, tmp, 0);
732 if (result < 0) {
733 DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n",
734 tmp, f->name, f, result);
735
736 reset_config(cdev);
737 goto done;
738 }
739
740 if (result == USB_GADGET_DELAYED_STATUS) {
741 DBG(cdev,
742 "%s: interface %d (%s) requested delayed status\n",
743 __func__, tmp, f->name);
744 cdev->delayed_status++;
745 DBG(cdev, "delayed_status count %d\n",
746 cdev->delayed_status);
747 }
748 }
749
750 /* when we return, be sure our power usage is valid */
751 power = c->MaxPower ? c->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
752 done:
753 if (power <= USB_SELF_POWER_VBUS_MAX_DRAW)
754 usb_gadget_set_selfpowered(gadget);
755 else
756 usb_gadget_clear_selfpowered(gadget);
757
758 usb_gadget_vbus_draw(gadget, power);
759 if (result >= 0 && cdev->delayed_status)
760 result = USB_GADGET_DELAYED_STATUS;
761 return result;
762 }
763
usb_add_config_only(struct usb_composite_dev * cdev,struct usb_configuration * config)764 int usb_add_config_only(struct usb_composite_dev *cdev,
765 struct usb_configuration *config)
766 {
767 struct usb_configuration *c;
768
769 if (!config->bConfigurationValue)
770 return -EINVAL;
771
772 /* Prevent duplicate configuration identifiers */
773 list_for_each_entry(c, &cdev->configs, list) {
774 if (c->bConfigurationValue == config->bConfigurationValue)
775 return -EBUSY;
776 }
777
778 config->cdev = cdev;
779 list_add_tail(&config->list, &cdev->configs);
780
781 INIT_LIST_HEAD(&config->functions);
782 config->next_interface_id = 0;
783 memset(config->interface, 0, sizeof(config->interface));
784
785 return 0;
786 }
787 EXPORT_SYMBOL_GPL(usb_add_config_only);
788
789 /**
790 * usb_add_config() - add a configuration to a device.
791 * @cdev: wraps the USB gadget
792 * @config: the configuration, with bConfigurationValue assigned
793 * @bind: the configuration's bind function
794 * Context: single threaded during gadget setup
795 *
796 * One of the main tasks of a composite @bind() routine is to
797 * add each of the configurations it supports, using this routine.
798 *
799 * This function returns the value of the configuration's @bind(), which
800 * is zero for success else a negative errno value. Binding configurations
801 * assigns global resources including string IDs, and per-configuration
802 * resources such as interface IDs and endpoints.
803 */
usb_add_config(struct usb_composite_dev * cdev,struct usb_configuration * config,int (* bind)(struct usb_configuration *))804 int usb_add_config(struct usb_composite_dev *cdev,
805 struct usb_configuration *config,
806 int (*bind)(struct usb_configuration *))
807 {
808 int status = -EINVAL;
809
810 if (!bind)
811 goto done;
812
813 DBG(cdev, "adding config #%u '%s'/%p\n",
814 config->bConfigurationValue,
815 config->label, config);
816
817 status = usb_add_config_only(cdev, config);
818 if (status)
819 goto done;
820
821 status = bind(config);
822 if (status < 0) {
823 while (!list_empty(&config->functions)) {
824 struct usb_function *f;
825
826 f = list_first_entry(&config->functions,
827 struct usb_function, list);
828 list_del(&f->list);
829 if (f->unbind) {
830 DBG(cdev, "unbind function '%s'/%p\n",
831 f->name, f);
832 f->unbind(config, f);
833 /* may free memory for "f" */
834 }
835 }
836 list_del(&config->list);
837 config->cdev = NULL;
838 } else {
839 unsigned i;
840
841 DBG(cdev, "cfg %d/%p speeds:%s%s%s\n",
842 config->bConfigurationValue, config,
843 config->superspeed ? " super" : "",
844 config->highspeed ? " high" : "",
845 config->fullspeed
846 ? (gadget_is_dualspeed(cdev->gadget)
847 ? " full"
848 : " full/low")
849 : "");
850
851 for (i = 0; i < MAX_CONFIG_INTERFACES; i++) {
852 struct usb_function *f = config->interface[i];
853
854 if (!f)
855 continue;
856 DBG(cdev, " interface %d = %s/%p\n",
857 i, f->name, f);
858 }
859 }
860
861 /* set_alt(), or next bind(), sets up ep->claimed as needed */
862 usb_ep_autoconfig_reset(cdev->gadget);
863
864 done:
865 if (status)
866 DBG(cdev, "added config '%s'/%u --> %d\n", config->label,
867 config->bConfigurationValue, status);
868 return status;
869 }
870 EXPORT_SYMBOL_GPL(usb_add_config);
871
remove_config(struct usb_composite_dev * cdev,struct usb_configuration * config)872 static void remove_config(struct usb_composite_dev *cdev,
873 struct usb_configuration *config)
874 {
875 while (!list_empty(&config->functions)) {
876 struct usb_function *f;
877
878 f = list_first_entry(&config->functions,
879 struct usb_function, list);
880 list_del(&f->list);
881 if (f->unbind) {
882 DBG(cdev, "unbind function '%s'/%p\n", f->name, f);
883 f->unbind(config, f);
884 /* may free memory for "f" */
885 }
886 }
887 list_del(&config->list);
888 if (config->unbind) {
889 DBG(cdev, "unbind config '%s'/%p\n", config->label, config);
890 config->unbind(config);
891 /* may free memory for "c" */
892 }
893 }
894
895 /**
896 * usb_remove_config() - remove a configuration from a device.
897 * @cdev: wraps the USB gadget
898 * @config: the configuration
899 *
900 * Drivers must call usb_gadget_disconnect before calling this function
901 * to disconnect the device from the host and make sure the host will not
902 * try to enumerate the device while we are changing the config list.
903 */
usb_remove_config(struct usb_composite_dev * cdev,struct usb_configuration * config)904 void usb_remove_config(struct usb_composite_dev *cdev,
905 struct usb_configuration *config)
906 {
907 unsigned long flags;
908
909 spin_lock_irqsave(&cdev->lock, flags);
910
911 if (cdev->config == config)
912 reset_config(cdev);
913
914 spin_unlock_irqrestore(&cdev->lock, flags);
915
916 remove_config(cdev, config);
917 }
918
919 /*-------------------------------------------------------------------------*/
920
921 /* We support strings in multiple languages ... string descriptor zero
922 * says which languages are supported. The typical case will be that
923 * only one language (probably English) is used, with i18n handled on
924 * the host side.
925 */
926
collect_langs(struct usb_gadget_strings ** sp,__le16 * buf)927 static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf)
928 {
929 const struct usb_gadget_strings *s;
930 __le16 language;
931 __le16 *tmp;
932
933 while (*sp) {
934 s = *sp;
935 language = cpu_to_le16(s->language);
936 for (tmp = buf; *tmp && tmp < &buf[USB_MAX_STRING_LEN]; tmp++) {
937 if (*tmp == language)
938 goto repeat;
939 }
940 *tmp++ = language;
941 repeat:
942 sp++;
943 }
944 }
945
lookup_string(struct usb_gadget_strings ** sp,void * buf,u16 language,int id)946 static int lookup_string(
947 struct usb_gadget_strings **sp,
948 void *buf,
949 u16 language,
950 int id
951 )
952 {
953 struct usb_gadget_strings *s;
954 int value;
955
956 while (*sp) {
957 s = *sp++;
958 if (s->language != language)
959 continue;
960 value = usb_gadget_get_string(s, id, buf);
961 if (value > 0)
962 return value;
963 }
964 return -EINVAL;
965 }
966
get_string(struct usb_composite_dev * cdev,void * buf,u16 language,int id)967 static int get_string(struct usb_composite_dev *cdev,
968 void *buf, u16 language, int id)
969 {
970 struct usb_composite_driver *composite = cdev->driver;
971 struct usb_gadget_string_container *uc;
972 struct usb_configuration *c;
973 struct usb_function *f;
974 int len;
975
976 /* Yes, not only is USB's i18n support probably more than most
977 * folk will ever care about ... also, it's all supported here.
978 * (Except for UTF8 support for Unicode's "Astral Planes".)
979 */
980
981 /* 0 == report all available language codes */
982 if (id == 0) {
983 struct usb_string_descriptor *s = buf;
984 struct usb_gadget_strings **sp;
985
986 memset(s, 0, 256);
987 s->bDescriptorType = USB_DT_STRING;
988
989 sp = composite->strings;
990 if (sp)
991 collect_langs(sp, s->wData);
992
993 list_for_each_entry(c, &cdev->configs, list) {
994 sp = c->strings;
995 if (sp)
996 collect_langs(sp, s->wData);
997
998 list_for_each_entry(f, &c->functions, list) {
999 sp = f->strings;
1000 if (sp)
1001 collect_langs(sp, s->wData);
1002 }
1003 }
1004 list_for_each_entry(uc, &cdev->gstrings, list) {
1005 struct usb_gadget_strings **sp;
1006
1007 sp = get_containers_gs(uc);
1008 collect_langs(sp, s->wData);
1009 }
1010
1011 for (len = 0; len <= USB_MAX_STRING_LEN && s->wData[len]; len++)
1012 continue;
1013 if (!len)
1014 return -EINVAL;
1015
1016 s->bLength = 2 * (len + 1);
1017 return s->bLength;
1018 }
1019
1020 if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) {
1021 struct usb_os_string *b = buf;
1022 b->bLength = sizeof(*b);
1023 b->bDescriptorType = USB_DT_STRING;
1024 compiletime_assert(
1025 sizeof(b->qwSignature) == sizeof(cdev->qw_sign),
1026 "qwSignature size must be equal to qw_sign");
1027 memcpy(&b->qwSignature, cdev->qw_sign, sizeof(b->qwSignature));
1028 b->bMS_VendorCode = cdev->b_vendor_code;
1029 b->bPad = 0;
1030 return sizeof(*b);
1031 }
1032
1033 list_for_each_entry(uc, &cdev->gstrings, list) {
1034 struct usb_gadget_strings **sp;
1035
1036 sp = get_containers_gs(uc);
1037 len = lookup_string(sp, buf, language, id);
1038 if (len > 0)
1039 return len;
1040 }
1041
1042 /* String IDs are device-scoped, so we look up each string
1043 * table we're told about. These lookups are infrequent;
1044 * simpler-is-better here.
1045 */
1046 if (composite->strings) {
1047 len = lookup_string(composite->strings, buf, language, id);
1048 if (len > 0)
1049 return len;
1050 }
1051 list_for_each_entry(c, &cdev->configs, list) {
1052 if (c->strings) {
1053 len = lookup_string(c->strings, buf, language, id);
1054 if (len > 0)
1055 return len;
1056 }
1057 list_for_each_entry(f, &c->functions, list) {
1058 if (!f->strings)
1059 continue;
1060 len = lookup_string(f->strings, buf, language, id);
1061 if (len > 0)
1062 return len;
1063 }
1064 }
1065 return -EINVAL;
1066 }
1067
1068 /**
1069 * usb_string_id() - allocate an unused string ID
1070 * @cdev: the device whose string descriptor IDs are being allocated
1071 * Context: single threaded during gadget setup
1072 *
1073 * @usb_string_id() is called from bind() callbacks to allocate
1074 * string IDs. Drivers for functions, configurations, or gadgets will
1075 * then store that ID in the appropriate descriptors and string table.
1076 *
1077 * All string identifier should be allocated using this,
1078 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
1079 * that for example different functions don't wrongly assign different
1080 * meanings to the same identifier.
1081 */
usb_string_id(struct usb_composite_dev * cdev)1082 int usb_string_id(struct usb_composite_dev *cdev)
1083 {
1084 if (cdev->next_string_id < 254) {
1085 /* string id 0 is reserved by USB spec for list of
1086 * supported languages */
1087 /* 255 reserved as well? -- mina86 */
1088 cdev->next_string_id++;
1089 return cdev->next_string_id;
1090 }
1091 return -ENODEV;
1092 }
1093 EXPORT_SYMBOL_GPL(usb_string_id);
1094
1095 /**
1096 * usb_string_ids() - allocate unused string IDs in batch
1097 * @cdev: the device whose string descriptor IDs are being allocated
1098 * @str: an array of usb_string objects to assign numbers to
1099 * Context: single threaded during gadget setup
1100 *
1101 * @usb_string_ids() is called from bind() callbacks to allocate
1102 * string IDs. Drivers for functions, configurations, or gadgets will
1103 * then copy IDs from the string table to the appropriate descriptors
1104 * and string table for other languages.
1105 *
1106 * All string identifier should be allocated using this,
1107 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1108 * example different functions don't wrongly assign different meanings
1109 * to the same identifier.
1110 */
usb_string_ids_tab(struct usb_composite_dev * cdev,struct usb_string * str)1111 int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
1112 {
1113 int next = cdev->next_string_id;
1114
1115 for (; str->s; ++str) {
1116 if (unlikely(next >= 254))
1117 return -ENODEV;
1118 str->id = ++next;
1119 }
1120
1121 cdev->next_string_id = next;
1122
1123 return 0;
1124 }
1125 EXPORT_SYMBOL_GPL(usb_string_ids_tab);
1126
copy_gadget_strings(struct usb_gadget_strings ** sp,unsigned n_gstrings,unsigned n_strings)1127 static struct usb_gadget_string_container *copy_gadget_strings(
1128 struct usb_gadget_strings **sp, unsigned n_gstrings,
1129 unsigned n_strings)
1130 {
1131 struct usb_gadget_string_container *uc;
1132 struct usb_gadget_strings **gs_array;
1133 struct usb_gadget_strings *gs;
1134 struct usb_string *s;
1135 unsigned mem;
1136 unsigned n_gs;
1137 unsigned n_s;
1138 void *stash;
1139
1140 mem = sizeof(*uc);
1141 mem += sizeof(void *) * (n_gstrings + 1);
1142 mem += sizeof(struct usb_gadget_strings) * n_gstrings;
1143 mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings);
1144 uc = kmalloc(mem, GFP_KERNEL);
1145 if (!uc)
1146 return ERR_PTR(-ENOMEM);
1147 gs_array = get_containers_gs(uc);
1148 stash = uc->stash;
1149 stash += sizeof(void *) * (n_gstrings + 1);
1150 for (n_gs = 0; n_gs < n_gstrings; n_gs++) {
1151 struct usb_string *org_s;
1152
1153 gs_array[n_gs] = stash;
1154 gs = gs_array[n_gs];
1155 stash += sizeof(struct usb_gadget_strings);
1156 gs->language = sp[n_gs]->language;
1157 gs->strings = stash;
1158 org_s = sp[n_gs]->strings;
1159
1160 for (n_s = 0; n_s < n_strings; n_s++) {
1161 s = stash;
1162 stash += sizeof(struct usb_string);
1163 if (org_s->s)
1164 s->s = org_s->s;
1165 else
1166 s->s = "";
1167 org_s++;
1168 }
1169 s = stash;
1170 s->s = NULL;
1171 stash += sizeof(struct usb_string);
1172
1173 }
1174 gs_array[n_gs] = NULL;
1175 return uc;
1176 }
1177
1178 /**
1179 * usb_gstrings_attach() - attach gadget strings to a cdev and assign ids
1180 * @cdev: the device whose string descriptor IDs are being allocated
1181 * and attached.
1182 * @sp: an array of usb_gadget_strings to attach.
1183 * @n_strings: number of entries in each usb_strings array (sp[]->strings)
1184 *
1185 * This function will create a deep copy of usb_gadget_strings and usb_string
1186 * and attach it to the cdev. The actual string (usb_string.s) will not be
1187 * copied but only a referenced will be made. The struct usb_gadget_strings
1188 * array may contain multiple languages and should be NULL terminated.
1189 * The ->language pointer of each struct usb_gadget_strings has to contain the
1190 * same amount of entries.
1191 * For instance: sp[0] is en-US, sp[1] is es-ES. It is expected that the first
1192 * usb_string entry of es-ES contains the translation of the first usb_string
1193 * entry of en-US. Therefore both entries become the same id assign.
1194 */
usb_gstrings_attach(struct usb_composite_dev * cdev,struct usb_gadget_strings ** sp,unsigned n_strings)1195 struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev,
1196 struct usb_gadget_strings **sp, unsigned n_strings)
1197 {
1198 struct usb_gadget_string_container *uc;
1199 struct usb_gadget_strings **n_gs;
1200 unsigned n_gstrings = 0;
1201 unsigned i;
1202 int ret;
1203
1204 for (i = 0; sp[i]; i++)
1205 n_gstrings++;
1206
1207 if (!n_gstrings)
1208 return ERR_PTR(-EINVAL);
1209
1210 uc = copy_gadget_strings(sp, n_gstrings, n_strings);
1211 if (IS_ERR(uc))
1212 return ERR_CAST(uc);
1213
1214 n_gs = get_containers_gs(uc);
1215 ret = usb_string_ids_tab(cdev, n_gs[0]->strings);
1216 if (ret)
1217 goto err;
1218
1219 for (i = 1; i < n_gstrings; i++) {
1220 struct usb_string *m_s;
1221 struct usb_string *s;
1222 unsigned n;
1223
1224 m_s = n_gs[0]->strings;
1225 s = n_gs[i]->strings;
1226 for (n = 0; n < n_strings; n++) {
1227 s->id = m_s->id;
1228 s++;
1229 m_s++;
1230 }
1231 }
1232 list_add_tail(&uc->list, &cdev->gstrings);
1233 return n_gs[0]->strings;
1234 err:
1235 kfree(uc);
1236 return ERR_PTR(ret);
1237 }
1238 EXPORT_SYMBOL_GPL(usb_gstrings_attach);
1239
1240 /**
1241 * usb_string_ids_n() - allocate unused string IDs in batch
1242 * @c: the device whose string descriptor IDs are being allocated
1243 * @n: number of string IDs to allocate
1244 * Context: single threaded during gadget setup
1245 *
1246 * Returns the first requested ID. This ID and next @n-1 IDs are now
1247 * valid IDs. At least provided that @n is non-zero because if it
1248 * is, returns last requested ID which is now very useful information.
1249 *
1250 * @usb_string_ids_n() is called from bind() callbacks to allocate
1251 * string IDs. Drivers for functions, configurations, or gadgets will
1252 * then store that ID in the appropriate descriptors and string table.
1253 *
1254 * All string identifier should be allocated using this,
1255 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1256 * example different functions don't wrongly assign different meanings
1257 * to the same identifier.
1258 */
usb_string_ids_n(struct usb_composite_dev * c,unsigned n)1259 int usb_string_ids_n(struct usb_composite_dev *c, unsigned n)
1260 {
1261 unsigned next = c->next_string_id;
1262 if (unlikely(n > 254 || (unsigned)next + n > 254))
1263 return -ENODEV;
1264 c->next_string_id += n;
1265 return next + 1;
1266 }
1267 EXPORT_SYMBOL_GPL(usb_string_ids_n);
1268
1269 /*-------------------------------------------------------------------------*/
1270
composite_setup_complete(struct usb_ep * ep,struct usb_request * req)1271 static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
1272 {
1273 struct usb_composite_dev *cdev;
1274
1275 if (req->status || req->actual != req->length)
1276 DBG((struct usb_composite_dev *) ep->driver_data,
1277 "setup complete --> %d, %d/%d\n",
1278 req->status, req->actual, req->length);
1279
1280 /*
1281 * REVIST The same ep0 requests are shared with function drivers
1282 * so they don't have to maintain the same ->complete() stubs.
1283 *
1284 * Because of that, we need to check for the validity of ->context
1285 * here, even though we know we've set it to something useful.
1286 */
1287 if (!req->context)
1288 return;
1289
1290 cdev = req->context;
1291
1292 if (cdev->req == req)
1293 cdev->setup_pending = false;
1294 else if (cdev->os_desc_req == req)
1295 cdev->os_desc_pending = false;
1296 else
1297 WARN(1, "unknown request %p\n", req);
1298 }
1299
composite_ep0_queue(struct usb_composite_dev * cdev,struct usb_request * req,gfp_t gfp_flags)1300 static int composite_ep0_queue(struct usb_composite_dev *cdev,
1301 struct usb_request *req, gfp_t gfp_flags)
1302 {
1303 int ret;
1304
1305 ret = usb_ep_queue(cdev->gadget->ep0, req, gfp_flags);
1306 if (ret == 0) {
1307 if (cdev->req == req)
1308 cdev->setup_pending = true;
1309 else if (cdev->os_desc_req == req)
1310 cdev->os_desc_pending = true;
1311 else
1312 WARN(1, "unknown request %p\n", req);
1313 }
1314
1315 return ret;
1316 }
1317
count_ext_compat(struct usb_configuration * c)1318 static int count_ext_compat(struct usb_configuration *c)
1319 {
1320 int i, res;
1321
1322 res = 0;
1323 for (i = 0; i < c->next_interface_id; ++i) {
1324 struct usb_function *f;
1325 int j;
1326
1327 f = c->interface[i];
1328 for (j = 0; j < f->os_desc_n; ++j) {
1329 struct usb_os_desc *d;
1330
1331 if (i != f->os_desc_table[j].if_id)
1332 continue;
1333 d = f->os_desc_table[j].os_desc;
1334 if (d && d->ext_compat_id)
1335 ++res;
1336 }
1337 }
1338 BUG_ON(res > 255);
1339 return res;
1340 }
1341
fill_ext_compat(struct usb_configuration * c,u8 * buf)1342 static int fill_ext_compat(struct usb_configuration *c, u8 *buf)
1343 {
1344 int i, count;
1345
1346 count = 16;
1347 for (i = 0; i < c->next_interface_id; ++i) {
1348 struct usb_function *f;
1349 int j;
1350
1351 f = c->interface[i];
1352 for (j = 0; j < f->os_desc_n; ++j) {
1353 struct usb_os_desc *d;
1354
1355 if (i != f->os_desc_table[j].if_id)
1356 continue;
1357 d = f->os_desc_table[j].os_desc;
1358 if (d && d->ext_compat_id) {
1359 *buf++ = i;
1360 *buf++ = 0x01;
1361 memcpy(buf, d->ext_compat_id, 16);
1362 buf += 22;
1363 } else {
1364 ++buf;
1365 *buf = 0x01;
1366 buf += 23;
1367 }
1368 count += 24;
1369 if (count + 24 >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1370 return count;
1371 }
1372 }
1373
1374 return count;
1375 }
1376
count_ext_prop(struct usb_configuration * c,int interface)1377 static int count_ext_prop(struct usb_configuration *c, int interface)
1378 {
1379 struct usb_function *f;
1380 int j;
1381
1382 f = c->interface[interface];
1383 for (j = 0; j < f->os_desc_n; ++j) {
1384 struct usb_os_desc *d;
1385
1386 if (interface != f->os_desc_table[j].if_id)
1387 continue;
1388 d = f->os_desc_table[j].os_desc;
1389 if (d && d->ext_compat_id)
1390 return d->ext_prop_count;
1391 }
1392 return 0;
1393 }
1394
len_ext_prop(struct usb_configuration * c,int interface)1395 static int len_ext_prop(struct usb_configuration *c, int interface)
1396 {
1397 struct usb_function *f;
1398 struct usb_os_desc *d;
1399 int j, res;
1400
1401 res = 10; /* header length */
1402 f = c->interface[interface];
1403 for (j = 0; j < f->os_desc_n; ++j) {
1404 if (interface != f->os_desc_table[j].if_id)
1405 continue;
1406 d = f->os_desc_table[j].os_desc;
1407 if (d)
1408 return min(res + d->ext_prop_len, 4096);
1409 }
1410 return res;
1411 }
1412
fill_ext_prop(struct usb_configuration * c,int interface,u8 * buf)1413 static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
1414 {
1415 struct usb_function *f;
1416 struct usb_os_desc *d;
1417 struct usb_os_desc_ext_prop *ext_prop;
1418 int j, count, n, ret;
1419
1420 f = c->interface[interface];
1421 count = 10; /* header length */
1422 for (j = 0; j < f->os_desc_n; ++j) {
1423 if (interface != f->os_desc_table[j].if_id)
1424 continue;
1425 d = f->os_desc_table[j].os_desc;
1426 if (d)
1427 list_for_each_entry(ext_prop, &d->ext_prop, entry) {
1428 n = ext_prop->data_len +
1429 ext_prop->name_len + 14;
1430 if (count + n >= USB_COMP_EP0_OS_DESC_BUFSIZ)
1431 return count;
1432 usb_ext_prop_put_size(buf, n);
1433 usb_ext_prop_put_type(buf, ext_prop->type);
1434 ret = usb_ext_prop_put_name(buf, ext_prop->name,
1435 ext_prop->name_len);
1436 if (ret < 0)
1437 return ret;
1438 switch (ext_prop->type) {
1439 case USB_EXT_PROP_UNICODE:
1440 case USB_EXT_PROP_UNICODE_ENV:
1441 case USB_EXT_PROP_UNICODE_LINK:
1442 usb_ext_prop_put_unicode(buf, ret,
1443 ext_prop->data,
1444 ext_prop->data_len);
1445 break;
1446 case USB_EXT_PROP_BINARY:
1447 usb_ext_prop_put_binary(buf, ret,
1448 ext_prop->data,
1449 ext_prop->data_len);
1450 break;
1451 case USB_EXT_PROP_LE32:
1452 /* not implemented */
1453 case USB_EXT_PROP_BE32:
1454 /* not implemented */
1455 default:
1456 return -EINVAL;
1457 }
1458 buf += n;
1459 count += n;
1460 }
1461 }
1462
1463 return count;
1464 }
1465
1466 /*
1467 * The setup() callback implements all the ep0 functionality that's
1468 * not handled lower down, in hardware or the hardware driver(like
1469 * device and endpoint feature flags, and their status). It's all
1470 * housekeeping for the gadget function we're implementing. Most of
1471 * the work is in config and function specific setup.
1472 */
1473 int
composite_setup(struct usb_gadget * gadget,const struct usb_ctrlrequest * ctrl)1474 composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1475 {
1476 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1477 struct usb_request *req = cdev->req;
1478 int value = -EOPNOTSUPP;
1479 int status = 0;
1480 u16 w_index = le16_to_cpu(ctrl->wIndex);
1481 u8 intf = w_index & 0xFF;
1482 u16 w_value = le16_to_cpu(ctrl->wValue);
1483 u16 w_length = le16_to_cpu(ctrl->wLength);
1484 struct usb_function *f = NULL;
1485 u8 endp;
1486
1487 if (w_length > USB_COMP_EP0_BUFSIZ) {
1488 if (ctrl->bRequestType & USB_DIR_IN) {
1489 /* Cast away the const, we are going to overwrite on purpose. */
1490 __le16 *temp = (__le16 *)&ctrl->wLength;
1491
1492 *temp = cpu_to_le16(USB_COMP_EP0_BUFSIZ);
1493 w_length = USB_COMP_EP0_BUFSIZ;
1494 } else {
1495 goto done;
1496 }
1497 }
1498
1499 /* partial re-init of the response message; the function or the
1500 * gadget might need to intercept e.g. a control-OUT completion
1501 * when we delegate to it.
1502 */
1503 req->zero = 0;
1504 req->context = cdev;
1505 req->complete = composite_setup_complete;
1506 req->length = 0;
1507 gadget->ep0->driver_data = cdev;
1508
1509 /*
1510 * Don't let non-standard requests match any of the cases below
1511 * by accident.
1512 */
1513 if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD)
1514 goto unknown;
1515
1516 switch (ctrl->bRequest) {
1517
1518 /* we handle all standard USB descriptors */
1519 case USB_REQ_GET_DESCRIPTOR:
1520 if (ctrl->bRequestType != USB_DIR_IN)
1521 goto unknown;
1522 switch (w_value >> 8) {
1523
1524 case USB_DT_DEVICE:
1525 cdev->desc.bNumConfigurations =
1526 count_configs(cdev, USB_DT_DEVICE);
1527 cdev->desc.bMaxPacketSize0 =
1528 cdev->gadget->ep0->maxpacket;
1529 if (gadget_is_superspeed(gadget)) {
1530 if (gadget->speed >= USB_SPEED_SUPER) {
1531 cdev->desc.bcdUSB = cpu_to_le16(0x0300);
1532 cdev->desc.bMaxPacketSize0 = 9;
1533 } else {
1534 cdev->desc.bcdUSB = cpu_to_le16(0x0210);
1535 }
1536 } else {
1537 cdev->desc.bcdUSB = cpu_to_le16(0x0200);
1538 }
1539
1540 value = min(w_length, (u16) sizeof cdev->desc);
1541 memcpy(req->buf, &cdev->desc, value);
1542 break;
1543 case USB_DT_DEVICE_QUALIFIER:
1544 if (!gadget_is_dualspeed(gadget) ||
1545 gadget->speed >= USB_SPEED_SUPER)
1546 break;
1547 device_qual(cdev);
1548 value = min_t(int, w_length,
1549 sizeof(struct usb_qualifier_descriptor));
1550 break;
1551 case USB_DT_OTHER_SPEED_CONFIG:
1552 if (!gadget_is_dualspeed(gadget) ||
1553 gadget->speed >= USB_SPEED_SUPER)
1554 break;
1555 /* FALLTHROUGH */
1556 case USB_DT_CONFIG:
1557 value = config_desc(cdev, w_value);
1558 if (value >= 0)
1559 value = min(w_length, (u16) value);
1560 break;
1561 case USB_DT_STRING:
1562 value = get_string(cdev, req->buf,
1563 w_index, w_value & 0xff);
1564 if (value >= 0)
1565 value = min(w_length, (u16) value);
1566 break;
1567 case USB_DT_BOS:
1568 if (gadget_is_superspeed(gadget)) {
1569 value = bos_desc(cdev);
1570 value = min(w_length, (u16) value);
1571 }
1572 break;
1573 case USB_DT_OTG:
1574 if (gadget_is_otg(gadget)) {
1575 struct usb_configuration *config;
1576 int otg_desc_len = 0;
1577
1578 if (cdev->config)
1579 config = cdev->config;
1580 else
1581 config = list_first_entry(
1582 &cdev->configs,
1583 struct usb_configuration, list);
1584 if (!config)
1585 goto done;
1586
1587 if (gadget->otg_caps &&
1588 (gadget->otg_caps->otg_rev >= 0x0200))
1589 otg_desc_len += sizeof(
1590 struct usb_otg20_descriptor);
1591 else
1592 otg_desc_len += sizeof(
1593 struct usb_otg_descriptor);
1594
1595 value = min_t(int, w_length, otg_desc_len);
1596 memcpy(req->buf, config->descriptors[0], value);
1597 }
1598 break;
1599 }
1600 break;
1601
1602 /* any number of configs can work */
1603 case USB_REQ_SET_CONFIGURATION:
1604 if (ctrl->bRequestType != 0)
1605 goto unknown;
1606 if (gadget_is_otg(gadget)) {
1607 if (gadget->a_hnp_support)
1608 DBG(cdev, "HNP available\n");
1609 else if (gadget->a_alt_hnp_support)
1610 DBG(cdev, "HNP on another port\n");
1611 else
1612 VDBG(cdev, "HNP inactive\n");
1613 }
1614 spin_lock(&cdev->lock);
1615 value = set_config(cdev, ctrl, w_value);
1616 spin_unlock(&cdev->lock);
1617 break;
1618 case USB_REQ_GET_CONFIGURATION:
1619 if (ctrl->bRequestType != USB_DIR_IN)
1620 goto unknown;
1621 if (cdev->config)
1622 *(u8 *)req->buf = cdev->config->bConfigurationValue;
1623 else
1624 *(u8 *)req->buf = 0;
1625 value = min(w_length, (u16) 1);
1626 break;
1627
1628 /* function drivers must handle get/set altsetting */
1629 case USB_REQ_SET_INTERFACE:
1630 if (ctrl->bRequestType != USB_RECIP_INTERFACE)
1631 goto unknown;
1632 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1633 break;
1634 f = cdev->config->interface[intf];
1635 if (!f)
1636 break;
1637
1638 /*
1639 * If there's no get_alt() method, we know only altsetting zero
1640 * works. There is no need to check if set_alt() is not NULL
1641 * as we check this in usb_add_function().
1642 */
1643 if (w_value && !f->get_alt)
1644 break;
1645
1646 spin_lock(&cdev->lock);
1647 value = f->set_alt(f, w_index, w_value);
1648 if (value == USB_GADGET_DELAYED_STATUS) {
1649 DBG(cdev,
1650 "%s: interface %d (%s) requested delayed status\n",
1651 __func__, intf, f->name);
1652 cdev->delayed_status++;
1653 DBG(cdev, "delayed_status count %d\n",
1654 cdev->delayed_status);
1655 }
1656 spin_unlock(&cdev->lock);
1657 break;
1658 case USB_REQ_GET_INTERFACE:
1659 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
1660 goto unknown;
1661 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1662 break;
1663 f = cdev->config->interface[intf];
1664 if (!f)
1665 break;
1666 /* lots of interfaces only need altsetting zero... */
1667 value = f->get_alt ? f->get_alt(f, w_index) : 0;
1668 if (value < 0)
1669 break;
1670 *((u8 *)req->buf) = value;
1671 value = min(w_length, (u16) 1);
1672 break;
1673
1674 /*
1675 * USB 3.0 additions:
1676 * Function driver should handle get_status request. If such cb
1677 * wasn't supplied we respond with default value = 0
1678 * Note: function driver should supply such cb only for the first
1679 * interface of the function
1680 */
1681 case USB_REQ_GET_STATUS:
1682 if (!gadget_is_superspeed(gadget))
1683 goto unknown;
1684 if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
1685 goto unknown;
1686 value = 2; /* This is the length of the get_status reply */
1687 put_unaligned_le16(0, req->buf);
1688 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1689 break;
1690 f = cdev->config->interface[intf];
1691 if (!f)
1692 break;
1693 status = f->get_status ? f->get_status(f) : 0;
1694 if (status < 0)
1695 break;
1696 put_unaligned_le16(status & 0x0000ffff, req->buf);
1697 break;
1698 /*
1699 * Function drivers should handle SetFeature/ClearFeature
1700 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
1701 * only for the first interface of the function
1702 */
1703 case USB_REQ_CLEAR_FEATURE:
1704 case USB_REQ_SET_FEATURE:
1705 if (!gadget_is_superspeed(gadget))
1706 goto unknown;
1707 if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE))
1708 goto unknown;
1709 switch (w_value) {
1710 case USB_INTRF_FUNC_SUSPEND:
1711 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1712 break;
1713 f = cdev->config->interface[intf];
1714 if (!f)
1715 break;
1716 value = 0;
1717 if (f->func_suspend)
1718 value = f->func_suspend(f, w_index >> 8);
1719 if (value < 0) {
1720 ERROR(cdev,
1721 "func_suspend() returned error %d\n",
1722 value);
1723 value = 0;
1724 }
1725 break;
1726 }
1727 break;
1728 default:
1729 unknown:
1730 /*
1731 * OS descriptors handling
1732 */
1733 if (cdev->use_os_string && cdev->os_desc_config &&
1734 (ctrl->bRequestType & USB_TYPE_VENDOR) &&
1735 ctrl->bRequest == cdev->b_vendor_code) {
1736 struct usb_request *req;
1737 struct usb_configuration *os_desc_cfg;
1738 u8 *buf;
1739 int interface;
1740 int count = 0;
1741
1742 req = cdev->os_desc_req;
1743 req->context = cdev;
1744 req->complete = composite_setup_complete;
1745 buf = req->buf;
1746 os_desc_cfg = cdev->os_desc_config;
1747 w_length = min_t(u16, w_length, USB_COMP_EP0_OS_DESC_BUFSIZ);
1748 memset(buf, 0, w_length);
1749 buf[5] = 0x01;
1750 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1751 case USB_RECIP_DEVICE:
1752 if (w_index != 0x4 || (w_value >> 8))
1753 break;
1754 buf[6] = w_index;
1755 if (w_length == 0x10) {
1756 /* Number of ext compat interfaces */
1757 count = count_ext_compat(os_desc_cfg);
1758 buf[8] = count;
1759 count *= 24; /* 24 B/ext compat desc */
1760 count += 16; /* header */
1761 put_unaligned_le32(count, buf);
1762 value = w_length;
1763 } else {
1764 /* "extended compatibility ID"s */
1765 count = count_ext_compat(os_desc_cfg);
1766 buf[8] = count;
1767 count *= 24; /* 24 B/ext compat desc */
1768 count += 16; /* header */
1769 put_unaligned_le32(count, buf);
1770 buf += 16;
1771 value = fill_ext_compat(os_desc_cfg, buf);
1772 value = min_t(u16, w_length, value);
1773 }
1774 break;
1775 case USB_RECIP_INTERFACE:
1776 if (w_index != 0x5 || (w_value >> 8))
1777 break;
1778 interface = w_value & 0xFF;
1779 buf[6] = w_index;
1780 if (w_length == 0x0A) {
1781 count = count_ext_prop(os_desc_cfg,
1782 interface);
1783 put_unaligned_le16(count, buf + 8);
1784 count = len_ext_prop(os_desc_cfg,
1785 interface);
1786 put_unaligned_le32(count, buf);
1787
1788 value = w_length;
1789 } else {
1790 count = count_ext_prop(os_desc_cfg,
1791 interface);
1792 put_unaligned_le16(count, buf + 8);
1793 count = len_ext_prop(os_desc_cfg,
1794 interface);
1795 put_unaligned_le32(count, buf);
1796 buf += 10;
1797 value = fill_ext_prop(os_desc_cfg,
1798 interface, buf);
1799 if (value < 0)
1800 return value;
1801 value = min_t(u16, w_length, value);
1802 }
1803 break;
1804 }
1805 req->length = value;
1806 req->context = cdev;
1807 req->zero = value < w_length;
1808 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
1809 if (value < 0) {
1810 DBG(cdev, "ep_queue --> %d\n", value);
1811 req->status = 0;
1812 composite_setup_complete(gadget->ep0, req);
1813 }
1814 return value;
1815 }
1816
1817 VDBG(cdev,
1818 "non-core control req%02x.%02x v%04x i%04x l%d\n",
1819 ctrl->bRequestType, ctrl->bRequest,
1820 w_value, w_index, w_length);
1821
1822 /* functions always handle their interfaces and endpoints...
1823 * punt other recipients (other, WUSB, ...) to the current
1824 * configuration code.
1825 *
1826 * REVISIT it could make sense to let the composite device
1827 * take such requests too, if that's ever needed: to work
1828 * in config 0, etc.
1829 */
1830 if (cdev->config) {
1831 list_for_each_entry(f, &cdev->config->functions, list)
1832 if (f->req_match && f->req_match(f, ctrl))
1833 goto try_fun_setup;
1834 f = NULL;
1835 }
1836
1837 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1838 case USB_RECIP_INTERFACE:
1839 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1840 break;
1841 f = cdev->config->interface[intf];
1842 break;
1843
1844 case USB_RECIP_ENDPOINT:
1845 if (!cdev->config)
1846 break;
1847 endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f);
1848 list_for_each_entry(f, &cdev->config->functions, list) {
1849 if (test_bit(endp, f->endpoints))
1850 break;
1851 }
1852 if (&f->list == &cdev->config->functions)
1853 f = NULL;
1854 break;
1855 }
1856 try_fun_setup:
1857 if (f && f->setup)
1858 value = f->setup(f, ctrl);
1859 else {
1860 struct usb_configuration *c;
1861
1862 c = cdev->config;
1863 if (!c)
1864 goto done;
1865
1866 /* try current config's setup */
1867 if (c->setup) {
1868 value = c->setup(c, ctrl);
1869 goto done;
1870 }
1871
1872 /* try the only function in the current config */
1873 if (!list_is_singular(&c->functions))
1874 goto done;
1875 f = list_first_entry(&c->functions, struct usb_function,
1876 list);
1877 if (f->setup)
1878 value = f->setup(f, ctrl);
1879 }
1880
1881 goto done;
1882 }
1883
1884 /* respond with data transfer before status phase? */
1885 if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) {
1886 req->length = value;
1887 req->context = cdev;
1888 req->zero = value < w_length;
1889 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
1890 if (value < 0) {
1891 DBG(cdev, "ep_queue --> %d\n", value);
1892 req->status = 0;
1893 composite_setup_complete(gadget->ep0, req);
1894 }
1895 } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) {
1896 WARN(cdev,
1897 "%s: Delayed status not supported for w_length != 0",
1898 __func__);
1899 }
1900
1901 done:
1902 /* device either stalls (value < 0) or reports success */
1903 return value;
1904 }
1905
composite_disconnect(struct usb_gadget * gadget)1906 void composite_disconnect(struct usb_gadget *gadget)
1907 {
1908 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1909 unsigned long flags;
1910
1911 if (cdev == NULL) {
1912 WARN(1, "%s: Calling disconnect on a Gadget that is \
1913 not connected\n", __func__);
1914 return;
1915 }
1916
1917 /* REVISIT: should we have config and device level
1918 * disconnect callbacks?
1919 */
1920 spin_lock_irqsave(&cdev->lock, flags);
1921 cdev->suspended = 0;
1922 if (cdev->config)
1923 reset_config(cdev);
1924 if (cdev->driver->disconnect)
1925 cdev->driver->disconnect(cdev);
1926 spin_unlock_irqrestore(&cdev->lock, flags);
1927 }
1928
1929 /*-------------------------------------------------------------------------*/
1930
suspended_show(struct device * dev,struct device_attribute * attr,char * buf)1931 static ssize_t suspended_show(struct device *dev, struct device_attribute *attr,
1932 char *buf)
1933 {
1934 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
1935 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1936
1937 return sprintf(buf, "%d\n", cdev->suspended);
1938 }
1939 static DEVICE_ATTR_RO(suspended);
1940
__composite_unbind(struct usb_gadget * gadget,bool unbind_driver)1941 static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
1942 {
1943 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1944 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
1945 struct usb_string *dev_str = gstr->strings;
1946
1947 /* composite_disconnect() must already have been called
1948 * by the underlying peripheral controller driver!
1949 * so there's no i/o concurrency that could affect the
1950 * state protected by cdev->lock.
1951 */
1952 WARN_ON(cdev->config);
1953
1954 while (!list_empty(&cdev->configs)) {
1955 struct usb_configuration *c;
1956 c = list_first_entry(&cdev->configs,
1957 struct usb_configuration, list);
1958 remove_config(cdev, c);
1959 }
1960 if (cdev->driver->unbind && unbind_driver)
1961 cdev->driver->unbind(cdev);
1962
1963 composite_dev_cleanup(cdev);
1964
1965 if (dev_str[USB_GADGET_MANUFACTURER_IDX].s == cdev->def_manufacturer)
1966 dev_str[USB_GADGET_MANUFACTURER_IDX].s = "";
1967
1968 kfree(cdev->def_manufacturer);
1969 kfree(cdev);
1970 set_gadget_data(gadget, NULL);
1971 }
1972
composite_unbind(struct usb_gadget * gadget)1973 static void composite_unbind(struct usb_gadget *gadget)
1974 {
1975 __composite_unbind(gadget, true);
1976 }
1977
update_unchanged_dev_desc(struct usb_device_descriptor * new,const struct usb_device_descriptor * old)1978 static void update_unchanged_dev_desc(struct usb_device_descriptor *new,
1979 const struct usb_device_descriptor *old)
1980 {
1981 __le16 idVendor;
1982 __le16 idProduct;
1983 __le16 bcdDevice;
1984 u8 iSerialNumber;
1985 u8 iManufacturer;
1986 u8 iProduct;
1987
1988 /*
1989 * these variables may have been set in
1990 * usb_composite_overwrite_options()
1991 */
1992 idVendor = new->idVendor;
1993 idProduct = new->idProduct;
1994 bcdDevice = new->bcdDevice;
1995 iSerialNumber = new->iSerialNumber;
1996 iManufacturer = new->iManufacturer;
1997 iProduct = new->iProduct;
1998
1999 *new = *old;
2000 if (idVendor)
2001 new->idVendor = idVendor;
2002 if (idProduct)
2003 new->idProduct = idProduct;
2004 if (bcdDevice)
2005 new->bcdDevice = bcdDevice;
2006 else
2007 new->bcdDevice = cpu_to_le16(get_default_bcdDevice());
2008 if (iSerialNumber)
2009 new->iSerialNumber = iSerialNumber;
2010 if (iManufacturer)
2011 new->iManufacturer = iManufacturer;
2012 if (iProduct)
2013 new->iProduct = iProduct;
2014 }
2015
composite_dev_prepare(struct usb_composite_driver * composite,struct usb_composite_dev * cdev)2016 int composite_dev_prepare(struct usb_composite_driver *composite,
2017 struct usb_composite_dev *cdev)
2018 {
2019 struct usb_gadget *gadget = cdev->gadget;
2020 int ret = -ENOMEM;
2021
2022 /* preallocate control response and buffer */
2023 cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
2024 if (!cdev->req)
2025 return -ENOMEM;
2026
2027 cdev->req->buf = kzalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
2028 if (!cdev->req->buf)
2029 goto fail;
2030
2031 ret = device_create_file(&gadget->dev, &dev_attr_suspended);
2032 if (ret)
2033 goto fail_dev;
2034
2035 cdev->req->complete = composite_setup_complete;
2036 cdev->req->context = cdev;
2037 gadget->ep0->driver_data = cdev;
2038
2039 cdev->driver = composite;
2040
2041 /*
2042 * As per USB compliance update, a device that is actively drawing
2043 * more than 100mA from USB must report itself as bus-powered in
2044 * the GetStatus(DEVICE) call.
2045 */
2046 if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW)
2047 usb_gadget_set_selfpowered(gadget);
2048
2049 /* interface and string IDs start at zero via kzalloc.
2050 * we force endpoints to start unassigned; few controller
2051 * drivers will zero ep->driver_data.
2052 */
2053 usb_ep_autoconfig_reset(gadget);
2054 return 0;
2055 fail_dev:
2056 kfree(cdev->req->buf);
2057 fail:
2058 usb_ep_free_request(gadget->ep0, cdev->req);
2059 cdev->req = NULL;
2060 return ret;
2061 }
2062
composite_os_desc_req_prepare(struct usb_composite_dev * cdev,struct usb_ep * ep0)2063 int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
2064 struct usb_ep *ep0)
2065 {
2066 int ret = 0;
2067
2068 cdev->os_desc_req = usb_ep_alloc_request(ep0, GFP_KERNEL);
2069 if (!cdev->os_desc_req) {
2070 ret = PTR_ERR(cdev->os_desc_req);
2071 goto end;
2072 }
2073
2074 cdev->os_desc_req->buf = kmalloc(USB_COMP_EP0_OS_DESC_BUFSIZ,
2075 GFP_KERNEL);
2076 if (!cdev->os_desc_req->buf) {
2077 ret = PTR_ERR(cdev->os_desc_req->buf);
2078 kfree(cdev->os_desc_req);
2079 goto end;
2080 }
2081 cdev->os_desc_req->context = cdev;
2082 cdev->os_desc_req->complete = composite_setup_complete;
2083 end:
2084 return ret;
2085 }
2086
composite_dev_cleanup(struct usb_composite_dev * cdev)2087 void composite_dev_cleanup(struct usb_composite_dev *cdev)
2088 {
2089 struct usb_gadget_string_container *uc, *tmp;
2090
2091 list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
2092 list_del(&uc->list);
2093 kfree(uc);
2094 }
2095 if (cdev->os_desc_req) {
2096 if (cdev->os_desc_pending)
2097 usb_ep_dequeue(cdev->gadget->ep0, cdev->os_desc_req);
2098
2099 kfree(cdev->os_desc_req->buf);
2100 cdev->os_desc_req->buf = NULL;
2101 usb_ep_free_request(cdev->gadget->ep0, cdev->os_desc_req);
2102 cdev->os_desc_req = NULL;
2103 }
2104 if (cdev->req) {
2105 if (cdev->setup_pending)
2106 usb_ep_dequeue(cdev->gadget->ep0, cdev->req);
2107
2108 kfree(cdev->req->buf);
2109 cdev->req->buf = NULL;
2110 usb_ep_free_request(cdev->gadget->ep0, cdev->req);
2111 cdev->req = NULL;
2112 }
2113 cdev->next_string_id = 0;
2114 device_remove_file(&cdev->gadget->dev, &dev_attr_suspended);
2115 }
2116
composite_bind(struct usb_gadget * gadget,struct usb_gadget_driver * gdriver)2117 static int composite_bind(struct usb_gadget *gadget,
2118 struct usb_gadget_driver *gdriver)
2119 {
2120 struct usb_composite_dev *cdev;
2121 struct usb_composite_driver *composite = to_cdriver(gdriver);
2122 int status = -ENOMEM;
2123
2124 cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
2125 if (!cdev)
2126 return status;
2127
2128 spin_lock_init(&cdev->lock);
2129 cdev->gadget = gadget;
2130 set_gadget_data(gadget, cdev);
2131 INIT_LIST_HEAD(&cdev->configs);
2132 INIT_LIST_HEAD(&cdev->gstrings);
2133
2134 status = composite_dev_prepare(composite, cdev);
2135 if (status)
2136 goto fail;
2137
2138 /* composite gadget needs to assign strings for whole device (like
2139 * serial number), register function drivers, potentially update
2140 * power state and consumption, etc
2141 */
2142 status = composite->bind(cdev);
2143 if (status < 0)
2144 goto fail;
2145
2146 if (cdev->use_os_string) {
2147 status = composite_os_desc_req_prepare(cdev, gadget->ep0);
2148 if (status)
2149 goto fail;
2150 }
2151
2152 update_unchanged_dev_desc(&cdev->desc, composite->dev);
2153
2154 /* has userspace failed to provide a serial number? */
2155 if (composite->needs_serial && !cdev->desc.iSerialNumber)
2156 WARNING(cdev, "userspace failed to provide iSerialNumber\n");
2157
2158 INFO(cdev, "%s ready\n", composite->name);
2159 return 0;
2160
2161 fail:
2162 __composite_unbind(gadget, false);
2163 return status;
2164 }
2165
2166 /*-------------------------------------------------------------------------*/
2167
composite_suspend(struct usb_gadget * gadget)2168 void composite_suspend(struct usb_gadget *gadget)
2169 {
2170 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2171 struct usb_function *f;
2172
2173 /* REVISIT: should we have config level
2174 * suspend/resume callbacks?
2175 */
2176 DBG(cdev, "suspend\n");
2177 if (cdev->config) {
2178 list_for_each_entry(f, &cdev->config->functions, list) {
2179 if (f->suspend)
2180 f->suspend(f);
2181 }
2182 }
2183 if (cdev->driver->suspend)
2184 cdev->driver->suspend(cdev);
2185
2186 cdev->suspended = 1;
2187
2188 usb_gadget_set_selfpowered(gadget);
2189 usb_gadget_vbus_draw(gadget, 2);
2190 }
2191
composite_resume(struct usb_gadget * gadget)2192 void composite_resume(struct usb_gadget *gadget)
2193 {
2194 struct usb_composite_dev *cdev = get_gadget_data(gadget);
2195 struct usb_function *f;
2196 u16 maxpower;
2197
2198 /* REVISIT: should we have config level
2199 * suspend/resume callbacks?
2200 */
2201 DBG(cdev, "resume\n");
2202 if (cdev->driver->resume)
2203 cdev->driver->resume(cdev);
2204 if (cdev->config) {
2205 list_for_each_entry(f, &cdev->config->functions, list) {
2206 if (f->resume)
2207 f->resume(f);
2208 }
2209
2210 maxpower = cdev->config->MaxPower;
2211
2212 if (maxpower > USB_SELF_POWER_VBUS_MAX_DRAW)
2213 usb_gadget_clear_selfpowered(gadget);
2214
2215 usb_gadget_vbus_draw(gadget, maxpower ?
2216 maxpower : CONFIG_USB_GADGET_VBUS_DRAW);
2217 }
2218
2219 cdev->suspended = 0;
2220 }
2221
2222 /*-------------------------------------------------------------------------*/
2223
2224 static const struct usb_gadget_driver composite_driver_template = {
2225 .bind = composite_bind,
2226 .unbind = composite_unbind,
2227
2228 .setup = composite_setup,
2229 .reset = composite_disconnect,
2230 .disconnect = composite_disconnect,
2231
2232 .suspend = composite_suspend,
2233 .resume = composite_resume,
2234
2235 .driver = {
2236 .owner = THIS_MODULE,
2237 },
2238 };
2239
2240 /**
2241 * usb_composite_probe() - register a composite driver
2242 * @driver: the driver to register
2243 *
2244 * Context: single threaded during gadget setup
2245 *
2246 * This function is used to register drivers using the composite driver
2247 * framework. The return value is zero, or a negative errno value.
2248 * Those values normally come from the driver's @bind method, which does
2249 * all the work of setting up the driver to match the hardware.
2250 *
2251 * On successful return, the gadget is ready to respond to requests from
2252 * the host, unless one of its components invokes usb_gadget_disconnect()
2253 * while it was binding. That would usually be done in order to wait for
2254 * some userspace participation.
2255 */
usb_composite_probe(struct usb_composite_driver * driver)2256 int usb_composite_probe(struct usb_composite_driver *driver)
2257 {
2258 struct usb_gadget_driver *gadget_driver;
2259
2260 if (!driver || !driver->dev || !driver->bind)
2261 return -EINVAL;
2262
2263 if (!driver->name)
2264 driver->name = "composite";
2265
2266 driver->gadget_driver = composite_driver_template;
2267 gadget_driver = &driver->gadget_driver;
2268
2269 gadget_driver->function = (char *) driver->name;
2270 gadget_driver->driver.name = driver->name;
2271 gadget_driver->max_speed = driver->max_speed;
2272
2273 return usb_gadget_probe_driver(gadget_driver);
2274 }
2275 EXPORT_SYMBOL_GPL(usb_composite_probe);
2276
2277 /**
2278 * usb_composite_unregister() - unregister a composite driver
2279 * @driver: the driver to unregister
2280 *
2281 * This function is used to unregister drivers using the composite
2282 * driver framework.
2283 */
usb_composite_unregister(struct usb_composite_driver * driver)2284 void usb_composite_unregister(struct usb_composite_driver *driver)
2285 {
2286 usb_gadget_unregister_driver(&driver->gadget_driver);
2287 }
2288 EXPORT_SYMBOL_GPL(usb_composite_unregister);
2289
2290 /**
2291 * usb_composite_setup_continue() - Continue with the control transfer
2292 * @cdev: the composite device who's control transfer was kept waiting
2293 *
2294 * This function must be called by the USB function driver to continue
2295 * with the control transfer's data/status stage in case it had requested to
2296 * delay the data/status stages. A USB function's setup handler (e.g. set_alt())
2297 * can request the composite framework to delay the setup request's data/status
2298 * stages by returning USB_GADGET_DELAYED_STATUS.
2299 */
usb_composite_setup_continue(struct usb_composite_dev * cdev)2300 void usb_composite_setup_continue(struct usb_composite_dev *cdev)
2301 {
2302 int value;
2303 struct usb_request *req = cdev->req;
2304 unsigned long flags;
2305
2306 DBG(cdev, "%s\n", __func__);
2307 spin_lock_irqsave(&cdev->lock, flags);
2308
2309 if (cdev->delayed_status == 0) {
2310 WARN(cdev, "%s: Unexpected call\n", __func__);
2311
2312 } else if (--cdev->delayed_status == 0) {
2313 DBG(cdev, "%s: Completing delayed status\n", __func__);
2314 req->length = 0;
2315 req->context = cdev;
2316 value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
2317 if (value < 0) {
2318 DBG(cdev, "ep_queue --> %d\n", value);
2319 req->status = 0;
2320 composite_setup_complete(cdev->gadget->ep0, req);
2321 }
2322 }
2323
2324 spin_unlock_irqrestore(&cdev->lock, flags);
2325 }
2326 EXPORT_SYMBOL_GPL(usb_composite_setup_continue);
2327
composite_default_mfr(struct usb_gadget * gadget)2328 static char *composite_default_mfr(struct usb_gadget *gadget)
2329 {
2330 char *mfr;
2331 int len;
2332
2333 len = snprintf(NULL, 0, "%s %s with %s", init_utsname()->sysname,
2334 init_utsname()->release, gadget->name);
2335 len++;
2336 mfr = kmalloc(len, GFP_KERNEL);
2337 if (!mfr)
2338 return NULL;
2339 snprintf(mfr, len, "%s %s with %s", init_utsname()->sysname,
2340 init_utsname()->release, gadget->name);
2341 return mfr;
2342 }
2343
usb_composite_overwrite_options(struct usb_composite_dev * cdev,struct usb_composite_overwrite * covr)2344 void usb_composite_overwrite_options(struct usb_composite_dev *cdev,
2345 struct usb_composite_overwrite *covr)
2346 {
2347 struct usb_device_descriptor *desc = &cdev->desc;
2348 struct usb_gadget_strings *gstr = cdev->driver->strings[0];
2349 struct usb_string *dev_str = gstr->strings;
2350
2351 if (covr->idVendor)
2352 desc->idVendor = cpu_to_le16(covr->idVendor);
2353
2354 if (covr->idProduct)
2355 desc->idProduct = cpu_to_le16(covr->idProduct);
2356
2357 if (covr->bcdDevice)
2358 desc->bcdDevice = cpu_to_le16(covr->bcdDevice);
2359
2360 if (covr->serial_number) {
2361 desc->iSerialNumber = dev_str[USB_GADGET_SERIAL_IDX].id;
2362 dev_str[USB_GADGET_SERIAL_IDX].s = covr->serial_number;
2363 }
2364 if (covr->manufacturer) {
2365 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2366 dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer;
2367
2368 } else if (!strlen(dev_str[USB_GADGET_MANUFACTURER_IDX].s)) {
2369 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id;
2370 cdev->def_manufacturer = composite_default_mfr(cdev->gadget);
2371 dev_str[USB_GADGET_MANUFACTURER_IDX].s = cdev->def_manufacturer;
2372 }
2373
2374 if (covr->product) {
2375 desc->iProduct = dev_str[USB_GADGET_PRODUCT_IDX].id;
2376 dev_str[USB_GADGET_PRODUCT_IDX].s = covr->product;
2377 }
2378 }
2379 EXPORT_SYMBOL_GPL(usb_composite_overwrite_options);
2380
2381 MODULE_LICENSE("GPL");
2382 MODULE_AUTHOR("David Brownell");
2383