blob: 86c0e7352efb22415603dfd4c123b468b154f240 [file] [log] [blame]
David Brownell40982be2008-06-19 17:52:58 -07001/*
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.
David Brownell40982be2008-06-19 17:52:58 -070010 */
11
12/* #define VERBOSE_DEBUG */
13
14#include <linux/kallsyms.h>
15#include <linux/kernel.h>
16#include <linux/slab.h>
Paul Gortmaker6eb0de82011-07-03 16:09:31 -040017#include <linux/module.h>
David Brownell40982be2008-06-19 17:52:58 -070018#include <linux/device.h>
Michal Nazarewiczad1a8102010-08-12 17:43:46 +020019#include <linux/utsname.h>
David Brownell40982be2008-06-19 17:52:58 -070020
21#include <linux/usb/composite.h>
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +030022#include <asm/unaligned.h>
David Brownell40982be2008-06-19 17:52:58 -070023
24/*
25 * The code in this file is utility code, used to build a gadget driver
26 * from one or more "function" drivers, one or more "configuration"
27 * objects, and a "usb_composite_driver" by gluing them together along
28 * with the relevant device-wide data.
29 */
30
31/* big enough to hold our biggest descriptor */
Manu Gautam8d887a12011-10-12 17:13:52 +053032#define USB_BUFSIZ 4096
David Brownell40982be2008-06-19 17:52:58 -070033
34static struct usb_composite_driver *composite;
Michal Nazarewicz07a18bd2010-08-12 17:43:54 +020035static int (*composite_gadget_bind)(struct usb_composite_dev *cdev);
David Brownell40982be2008-06-19 17:52:58 -070036
Lucas De Marchi25985ed2011-03-30 22:57:33 -030037/* Some systems will need runtime overrides for the product identifiers
David Brownell40982be2008-06-19 17:52:58 -070038 * published in the device descriptor, either numbers or strings or both.
39 * String parameters are in UTF-8 (superset of ASCII's 7 bit characters).
40 */
41
42static ushort idVendor;
43module_param(idVendor, ushort, 0);
44MODULE_PARM_DESC(idVendor, "USB Vendor ID");
45
46static ushort idProduct;
47module_param(idProduct, ushort, 0);
48MODULE_PARM_DESC(idProduct, "USB Product ID");
49
50static ushort bcdDevice;
51module_param(bcdDevice, ushort, 0);
52MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");
53
54static char *iManufacturer;
55module_param(iManufacturer, charp, 0);
56MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");
57
58static char *iProduct;
59module_param(iProduct, charp, 0);
60MODULE_PARM_DESC(iProduct, "USB Product string");
61
62static char *iSerialNumber;
63module_param(iSerialNumber, charp, 0);
64MODULE_PARM_DESC(iSerialNumber, "SerialNumber string");
65
Michal Nazarewiczad1a8102010-08-12 17:43:46 +020066static char composite_manufacturer[50];
67
David Brownell40982be2008-06-19 17:52:58 -070068/*-------------------------------------------------------------------------*/
Tatyana Brokhman48767a42011-06-28 16:33:49 +030069/**
70 * next_ep_desc() - advance to the next EP descriptor
71 * @t: currect pointer within descriptor array
72 *
73 * Return: next EP descriptor or NULL
74 *
75 * Iterate over @t until either EP descriptor found or
76 * NULL (that indicates end of list) encountered
77 */
78static struct usb_descriptor_header**
79next_ep_desc(struct usb_descriptor_header **t)
80{
81 for (; *t; t++) {
82 if ((*t)->bDescriptorType == USB_DT_ENDPOINT)
83 return t;
84 }
85 return NULL;
86}
87
88/*
89 * for_each_ep_desc()- iterate over endpoint descriptors in the
90 * descriptors list
91 * @start: pointer within descriptor array.
92 * @ep_desc: endpoint descriptor to use as the loop cursor
93 */
94#define for_each_ep_desc(start, ep_desc) \
95 for (ep_desc = next_ep_desc(start); \
96 ep_desc; ep_desc = next_ep_desc(ep_desc+1))
97
98/**
99 * config_ep_by_speed() - configures the given endpoint
100 * according to gadget speed.
101 * @g: pointer to the gadget
102 * @f: usb function
103 * @_ep: the endpoint to configure
104 *
105 * Return: error code, 0 on success
106 *
107 * This function chooses the right descriptors for a given
108 * endpoint according to gadget speed and saves it in the
109 * endpoint desc field. If the endpoint already has a descriptor
110 * assigned to it - overwrites it with currently corresponding
111 * descriptor. The endpoint maxpacket field is updated according
112 * to the chosen descriptor.
113 * Note: the supplied function should hold all the descriptors
114 * for supported speeds
115 */
116int config_ep_by_speed(struct usb_gadget *g,
117 struct usb_function *f,
118 struct usb_ep *_ep)
119{
120 struct usb_endpoint_descriptor *chosen_desc = NULL;
121 struct usb_descriptor_header **speed_desc = NULL;
122
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300123 struct usb_ss_ep_comp_descriptor *comp_desc = NULL;
124 int want_comp_desc = 0;
125
Tatyana Brokhman48767a42011-06-28 16:33:49 +0300126 struct usb_descriptor_header **d_spd; /* cursor for speed desc */
127
128 if (!g || !f || !_ep)
129 return -EIO;
130
131 /* select desired speed */
132 switch (g->speed) {
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300133 case USB_SPEED_SUPER:
134 if (gadget_is_superspeed(g)) {
135 speed_desc = f->ss_descriptors;
136 want_comp_desc = 1;
137 break;
138 }
139 /* else: Fall trough */
Tatyana Brokhman48767a42011-06-28 16:33:49 +0300140 case USB_SPEED_HIGH:
141 if (gadget_is_dualspeed(g)) {
142 speed_desc = f->hs_descriptors;
143 break;
144 }
145 /* else: fall through */
146 default:
147 speed_desc = f->descriptors;
148 }
149 /* find descriptors */
150 for_each_ep_desc(speed_desc, d_spd) {
151 chosen_desc = (struct usb_endpoint_descriptor *)*d_spd;
152 if (chosen_desc->bEndpointAddress == _ep->address)
153 goto ep_found;
154 }
155 return -EIO;
156
157ep_found:
158 /* commit results */
Kuninori Morimoto29cc8892011-08-23 03:12:03 -0700159 _ep->maxpacket = usb_endpoint_maxp(chosen_desc);
Tatyana Brokhman48767a42011-06-28 16:33:49 +0300160 _ep->desc = chosen_desc;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300161 _ep->comp_desc = NULL;
162 _ep->maxburst = 0;
163 _ep->mult = 0;
164 if (!want_comp_desc)
165 return 0;
Tatyana Brokhman48767a42011-06-28 16:33:49 +0300166
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300167 /*
168 * Companion descriptor should follow EP descriptor
169 * USB 3.0 spec, #9.6.7
170 */
171 comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd);
172 if (!comp_desc ||
173 (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP))
174 return -EIO;
175 _ep->comp_desc = comp_desc;
176 if (g->speed == USB_SPEED_SUPER) {
177 switch (usb_endpoint_type(_ep->desc)) {
Paul Zimmerman9e878a62012-01-16 13:24:38 -0800178 case USB_ENDPOINT_XFER_BULK:
179 case USB_ENDPOINT_XFER_INT:
180 _ep->maxburst = comp_desc->bMaxBurst;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300181 break;
Tatyana Brokhmanbc2aa112011-06-29 16:41:50 +0300182 case USB_ENDPOINT_XFER_ISOC:
183 /* mult: bits 1:0 of bmAttributes */
184 _ep->mult = comp_desc->bmAttributes & 0x3;
185 break;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300186 default:
187 /* Do nothing for control endpoints */
188 break;
189 }
190 }
Tatyana Brokhman48767a42011-06-28 16:33:49 +0300191 return 0;
192}
David Brownell40982be2008-06-19 17:52:58 -0700193
194/**
195 * usb_add_function() - add a function to a configuration
196 * @config: the configuration
197 * @function: the function being added
198 * Context: single threaded during gadget setup
199 *
200 * After initialization, each configuration must have one or more
201 * functions added to it. Adding a function involves calling its @bind()
202 * method to allocate resources such as interface and string identifiers
203 * and endpoints.
204 *
205 * This function returns the value of the function's bind(), which is
206 * zero for success else a negative errno value.
207 */
Michal Nazarewicz28824b12010-05-05 12:53:13 +0200208int usb_add_function(struct usb_configuration *config,
David Brownell40982be2008-06-19 17:52:58 -0700209 struct usb_function *function)
210{
211 int value = -EINVAL;
212
213 DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n",
214 function->name, function,
215 config->label, config);
216
217 if (!function->set_alt || !function->disable)
218 goto done;
219
220 function->config = config;
221 list_add_tail(&function->list, &config->functions);
222
223 /* REVISIT *require* function->bind? */
224 if (function->bind) {
225 value = function->bind(config, function);
226 if (value < 0) {
227 list_del(&function->list);
228 function->config = NULL;
229 }
230 } else
231 value = 0;
232
233 /* We allow configurations that don't work at both speeds.
234 * If we run into a lowspeed Linux system, treat it the same
235 * as full speed ... it's the function drivers that will need
236 * to avoid bulk and ISO transfers.
237 */
238 if (!config->fullspeed && function->descriptors)
239 config->fullspeed = true;
240 if (!config->highspeed && function->hs_descriptors)
241 config->highspeed = true;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300242 if (!config->superspeed && function->ss_descriptors)
243 config->superspeed = true;
David Brownell40982be2008-06-19 17:52:58 -0700244
245done:
246 if (value)
247 DBG(config->cdev, "adding '%s'/%p --> %d\n",
248 function->name, function, value);
249 return value;
250}
251
252/**
David Brownell60beed92008-08-18 17:38:22 -0700253 * usb_function_deactivate - prevent function and gadget enumeration
254 * @function: the function that isn't yet ready to respond
255 *
256 * Blocks response of the gadget driver to host enumeration by
257 * preventing the data line pullup from being activated. This is
258 * normally called during @bind() processing to change from the
259 * initial "ready to respond" state, or when a required resource
260 * becomes available.
261 *
262 * For example, drivers that serve as a passthrough to a userspace
263 * daemon can block enumeration unless that daemon (such as an OBEX,
264 * MTP, or print server) is ready to handle host requests.
265 *
266 * Not all systems support software control of their USB peripheral
267 * data pullups.
268 *
269 * Returns zero on success, else negative errno.
270 */
271int usb_function_deactivate(struct usb_function *function)
272{
273 struct usb_composite_dev *cdev = function->config->cdev;
Felipe Balbib2bdf3a2009-02-12 15:09:47 +0200274 unsigned long flags;
David Brownell60beed92008-08-18 17:38:22 -0700275 int status = 0;
276
Felipe Balbib2bdf3a2009-02-12 15:09:47 +0200277 spin_lock_irqsave(&cdev->lock, flags);
David Brownell60beed92008-08-18 17:38:22 -0700278
279 if (cdev->deactivations == 0)
280 status = usb_gadget_disconnect(cdev->gadget);
281 if (status == 0)
282 cdev->deactivations++;
283
Felipe Balbib2bdf3a2009-02-12 15:09:47 +0200284 spin_unlock_irqrestore(&cdev->lock, flags);
David Brownell60beed92008-08-18 17:38:22 -0700285 return status;
286}
287
288/**
289 * usb_function_activate - allow function and gadget enumeration
290 * @function: function on which usb_function_activate() was called
291 *
292 * Reverses effect of usb_function_deactivate(). If no more functions
293 * are delaying their activation, the gadget driver will respond to
294 * host enumeration procedures.
295 *
296 * Returns zero on success, else negative errno.
297 */
298int usb_function_activate(struct usb_function *function)
299{
300 struct usb_composite_dev *cdev = function->config->cdev;
301 int status = 0;
302
303 spin_lock(&cdev->lock);
304
305 if (WARN_ON(cdev->deactivations == 0))
306 status = -EINVAL;
307 else {
308 cdev->deactivations--;
309 if (cdev->deactivations == 0)
310 status = usb_gadget_connect(cdev->gadget);
311 }
312
313 spin_unlock(&cdev->lock);
314 return status;
315}
316
317/**
David Brownell40982be2008-06-19 17:52:58 -0700318 * usb_interface_id() - allocate an unused interface ID
319 * @config: configuration associated with the interface
320 * @function: function handling the interface
321 * Context: single threaded during gadget setup
322 *
323 * usb_interface_id() is called from usb_function.bind() callbacks to
324 * allocate new interface IDs. The function driver will then store that
325 * ID in interface, association, CDC union, and other descriptors. It
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300326 * will also handle any control requests targeted at that interface,
David Brownell40982be2008-06-19 17:52:58 -0700327 * particularly changing its altsetting via set_alt(). There may
328 * also be class-specific or vendor-specific requests to handle.
329 *
330 * All interface identifier should be allocated using this routine, to
331 * ensure that for example different functions don't wrongly assign
332 * different meanings to the same identifier. Note that since interface
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300333 * identifiers are configuration-specific, functions used in more than
David Brownell40982be2008-06-19 17:52:58 -0700334 * one configuration (or more than once in a given configuration) need
335 * multiple versions of the relevant descriptors.
336 *
337 * Returns the interface ID which was allocated; or -ENODEV if no
338 * more interface IDs can be allocated.
339 */
Michal Nazarewicz28824b12010-05-05 12:53:13 +0200340int usb_interface_id(struct usb_configuration *config,
David Brownell40982be2008-06-19 17:52:58 -0700341 struct usb_function *function)
342{
343 unsigned id = config->next_interface_id;
344
345 if (id < MAX_CONFIG_INTERFACES) {
346 config->interface[id] = function;
347 config->next_interface_id = id + 1;
348 return id;
349 }
350 return -ENODEV;
351}
352
353static int config_buf(struct usb_configuration *config,
354 enum usb_device_speed speed, void *buf, u8 type)
355{
356 struct usb_config_descriptor *c = buf;
357 void *next = buf + USB_DT_CONFIG_SIZE;
358 int len = USB_BUFSIZ - USB_DT_CONFIG_SIZE;
359 struct usb_function *f;
360 int status;
361
362 /* write the config descriptor */
363 c = buf;
364 c->bLength = USB_DT_CONFIG_SIZE;
365 c->bDescriptorType = type;
366 /* wTotalLength is written later */
367 c->bNumInterfaces = config->next_interface_id;
368 c->bConfigurationValue = config->bConfigurationValue;
369 c->iConfiguration = config->iConfiguration;
370 c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes;
David Brownell36e893d2008-09-12 09:39:06 -0700371 c->bMaxPower = config->bMaxPower ? : (CONFIG_USB_GADGET_VBUS_DRAW / 2);
David Brownell40982be2008-06-19 17:52:58 -0700372
373 /* There may be e.g. OTG descriptors */
374 if (config->descriptors) {
375 status = usb_descriptor_fillbuf(next, len,
376 config->descriptors);
377 if (status < 0)
378 return status;
379 len -= status;
380 next += status;
381 }
382
383 /* add each function's descriptors */
384 list_for_each_entry(f, &config->functions, list) {
385 struct usb_descriptor_header **descriptors;
386
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300387 switch (speed) {
388 case USB_SPEED_SUPER:
389 descriptors = f->ss_descriptors;
390 break;
391 case USB_SPEED_HIGH:
David Brownell40982be2008-06-19 17:52:58 -0700392 descriptors = f->hs_descriptors;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300393 break;
394 default:
David Brownell40982be2008-06-19 17:52:58 -0700395 descriptors = f->descriptors;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300396 }
397
David Brownell40982be2008-06-19 17:52:58 -0700398 if (!descriptors)
399 continue;
400 status = usb_descriptor_fillbuf(next, len,
401 (const struct usb_descriptor_header **) descriptors);
402 if (status < 0)
403 return status;
404 len -= status;
405 next += status;
406 }
407
408 len = next - buf;
409 c->wTotalLength = cpu_to_le16(len);
410 return len;
411}
412
413static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
414{
415 struct usb_gadget *gadget = cdev->gadget;
416 struct usb_configuration *c;
417 u8 type = w_value >> 8;
418 enum usb_device_speed speed = USB_SPEED_UNKNOWN;
419
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300420 if (gadget->speed == USB_SPEED_SUPER)
421 speed = gadget->speed;
422 else if (gadget_is_dualspeed(gadget)) {
423 int hs = 0;
David Brownell40982be2008-06-19 17:52:58 -0700424 if (gadget->speed == USB_SPEED_HIGH)
425 hs = 1;
426 if (type == USB_DT_OTHER_SPEED_CONFIG)
427 hs = !hs;
428 if (hs)
429 speed = USB_SPEED_HIGH;
430
431 }
432
433 /* This is a lookup by config *INDEX* */
434 w_value &= 0xff;
435 list_for_each_entry(c, &cdev->configs, list) {
436 /* ignore configs that won't work at this speed */
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300437 switch (speed) {
438 case USB_SPEED_SUPER:
439 if (!c->superspeed)
440 continue;
441 break;
442 case USB_SPEED_HIGH:
David Brownell40982be2008-06-19 17:52:58 -0700443 if (!c->highspeed)
444 continue;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300445 break;
446 default:
David Brownell40982be2008-06-19 17:52:58 -0700447 if (!c->fullspeed)
448 continue;
449 }
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300450
David Brownell40982be2008-06-19 17:52:58 -0700451 if (w_value == 0)
452 return config_buf(c, speed, cdev->req->buf, type);
453 w_value--;
454 }
455 return -EINVAL;
456}
457
458static int count_configs(struct usb_composite_dev *cdev, unsigned type)
459{
460 struct usb_gadget *gadget = cdev->gadget;
461 struct usb_configuration *c;
462 unsigned count = 0;
463 int hs = 0;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300464 int ss = 0;
David Brownell40982be2008-06-19 17:52:58 -0700465
466 if (gadget_is_dualspeed(gadget)) {
467 if (gadget->speed == USB_SPEED_HIGH)
468 hs = 1;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300469 if (gadget->speed == USB_SPEED_SUPER)
470 ss = 1;
David Brownell40982be2008-06-19 17:52:58 -0700471 if (type == USB_DT_DEVICE_QUALIFIER)
472 hs = !hs;
473 }
474 list_for_each_entry(c, &cdev->configs, list) {
475 /* ignore configs that won't work at this speed */
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300476 if (ss) {
477 if (!c->superspeed)
478 continue;
479 } else if (hs) {
David Brownell40982be2008-06-19 17:52:58 -0700480 if (!c->highspeed)
481 continue;
482 } else {
483 if (!c->fullspeed)
484 continue;
485 }
486 count++;
487 }
488 return count;
489}
490
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300491/**
492 * bos_desc() - prepares the BOS descriptor.
493 * @cdev: pointer to usb_composite device to generate the bos
494 * descriptor for
495 *
496 * This function generates the BOS (Binary Device Object)
497 * descriptor and its device capabilities descriptors. The BOS
498 * descriptor should be supported by a SuperSpeed device.
499 */
500static int bos_desc(struct usb_composite_dev *cdev)
501{
502 struct usb_ext_cap_descriptor *usb_ext;
503 struct usb_ss_cap_descriptor *ss_cap;
504 struct usb_dcd_config_params dcd_config_params;
505 struct usb_bos_descriptor *bos = cdev->req->buf;
506
507 bos->bLength = USB_DT_BOS_SIZE;
508 bos->bDescriptorType = USB_DT_BOS;
509
510 bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
511 bos->bNumDeviceCaps = 0;
512
513 /*
514 * A SuperSpeed device shall include the USB2.0 extension descriptor
515 * and shall support LPM when operating in USB2.0 HS mode.
516 */
517 usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
518 bos->bNumDeviceCaps++;
519 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
520 usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
521 usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
522 usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
523 usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT);
524
525 /*
526 * The Superspeed USB Capability descriptor shall be implemented by all
527 * SuperSpeed devices.
528 */
529 ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
530 bos->bNumDeviceCaps++;
531 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
532 ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
533 ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
534 ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
535 ss_cap->bmAttributes = 0; /* LTM is not supported yet */
536 ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
537 USB_FULL_SPEED_OPERATION |
538 USB_HIGH_SPEED_OPERATION |
539 USB_5GBPS_OPERATION);
540 ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
541
542 /* Get Controller configuration */
543 if (cdev->gadget->ops->get_config_params)
544 cdev->gadget->ops->get_config_params(&dcd_config_params);
545 else {
Felipe Balbi089b8372011-10-10 09:43:44 +0300546 dcd_config_params.bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300547 dcd_config_params.bU2DevExitLat =
Felipe Balbi089b8372011-10-10 09:43:44 +0300548 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300549 }
550 ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
551 ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
552
553 return le16_to_cpu(bos->wTotalLength);
554}
555
David Brownell40982be2008-06-19 17:52:58 -0700556static void device_qual(struct usb_composite_dev *cdev)
557{
558 struct usb_qualifier_descriptor *qual = cdev->req->buf;
559
560 qual->bLength = sizeof(*qual);
561 qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
562 /* POLICY: same bcdUSB and device type info at both speeds */
563 qual->bcdUSB = cdev->desc.bcdUSB;
564 qual->bDeviceClass = cdev->desc.bDeviceClass;
565 qual->bDeviceSubClass = cdev->desc.bDeviceSubClass;
566 qual->bDeviceProtocol = cdev->desc.bDeviceProtocol;
567 /* ASSUME same EP0 fifo size at both speeds */
Sebastian Andrzej Siewior765f5b82011-06-23 14:26:11 +0200568 qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket;
David Brownell40982be2008-06-19 17:52:58 -0700569 qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER);
David Lopoc24f4222008-07-01 13:14:17 -0700570 qual->bRESERVED = 0;
David Brownell40982be2008-06-19 17:52:58 -0700571}
572
573/*-------------------------------------------------------------------------*/
574
575static void reset_config(struct usb_composite_dev *cdev)
576{
577 struct usb_function *f;
578
579 DBG(cdev, "reset config\n");
580
581 list_for_each_entry(f, &cdev->config->functions, list) {
582 if (f->disable)
583 f->disable(f);
Laurent Pinchart52426582009-10-21 00:03:38 +0200584
585 bitmap_zero(f->endpoints, 32);
David Brownell40982be2008-06-19 17:52:58 -0700586 }
587 cdev->config = NULL;
588}
589
590static int set_config(struct usb_composite_dev *cdev,
591 const struct usb_ctrlrequest *ctrl, unsigned number)
592{
593 struct usb_gadget *gadget = cdev->gadget;
594 struct usb_configuration *c = NULL;
595 int result = -EINVAL;
596 unsigned power = gadget_is_otg(gadget) ? 8 : 100;
597 int tmp;
598
David Brownell40982be2008-06-19 17:52:58 -0700599 if (number) {
600 list_for_each_entry(c, &cdev->configs, list) {
601 if (c->bConfigurationValue == number) {
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300602 /*
603 * We disable the FDs of the previous
604 * configuration only if the new configuration
605 * is a valid one
606 */
607 if (cdev->config)
608 reset_config(cdev);
David Brownell40982be2008-06-19 17:52:58 -0700609 result = 0;
610 break;
611 }
612 }
613 if (result < 0)
614 goto done;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300615 } else { /* Zero configuration value - need to reset the config */
616 if (cdev->config)
617 reset_config(cdev);
David Brownell40982be2008-06-19 17:52:58 -0700618 result = 0;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300619 }
David Brownell40982be2008-06-19 17:52:58 -0700620
Michal Nazarewicze538dfd2011-08-30 17:11:19 +0200621 INFO(cdev, "%s config #%d: %s\n",
622 usb_speed_string(gadget->speed),
623 number, c ? c->label : "unconfigured");
David Brownell40982be2008-06-19 17:52:58 -0700624
625 if (!c)
626 goto done;
627
628 cdev->config = c;
629
630 /* Initialize all interfaces by setting them to altsetting zero. */
631 for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) {
632 struct usb_function *f = c->interface[tmp];
Laurent Pinchart52426582009-10-21 00:03:38 +0200633 struct usb_descriptor_header **descriptors;
David Brownell40982be2008-06-19 17:52:58 -0700634
635 if (!f)
636 break;
637
Laurent Pinchart52426582009-10-21 00:03:38 +0200638 /*
639 * Record which endpoints are used by the function. This is used
640 * to dispatch control requests targeted at that endpoint to the
641 * function's setup callback instead of the current
642 * configuration's setup callback.
643 */
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300644 switch (gadget->speed) {
645 case USB_SPEED_SUPER:
646 descriptors = f->ss_descriptors;
647 break;
648 case USB_SPEED_HIGH:
Laurent Pinchart52426582009-10-21 00:03:38 +0200649 descriptors = f->hs_descriptors;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300650 break;
651 default:
Laurent Pinchart52426582009-10-21 00:03:38 +0200652 descriptors = f->descriptors;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300653 }
Laurent Pinchart52426582009-10-21 00:03:38 +0200654
655 for (; *descriptors; ++descriptors) {
656 struct usb_endpoint_descriptor *ep;
657 int addr;
658
659 if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT)
660 continue;
661
662 ep = (struct usb_endpoint_descriptor *)*descriptors;
663 addr = ((ep->bEndpointAddress & 0x80) >> 3)
664 | (ep->bEndpointAddress & 0x0f);
665 set_bit(addr, f->endpoints);
666 }
667
David Brownell40982be2008-06-19 17:52:58 -0700668 result = f->set_alt(f, tmp, 0);
669 if (result < 0) {
670 DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n",
671 tmp, f->name, f, result);
672
673 reset_config(cdev);
674 goto done;
675 }
Roger Quadros1b9ba002011-05-09 13:08:06 +0300676
677 if (result == USB_GADGET_DELAYED_STATUS) {
678 DBG(cdev,
679 "%s: interface %d (%s) requested delayed status\n",
680 __func__, tmp, f->name);
681 cdev->delayed_status++;
682 DBG(cdev, "delayed_status count %d\n",
683 cdev->delayed_status);
684 }
David Brownell40982be2008-06-19 17:52:58 -0700685 }
686
687 /* when we return, be sure our power usage is valid */
David Brownell36e893d2008-09-12 09:39:06 -0700688 power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW;
David Brownell40982be2008-06-19 17:52:58 -0700689done:
690 usb_gadget_vbus_draw(gadget, power);
Mike Lockwoode2dc5032010-06-23 08:20:59 -0400691
Roger Quadros1b9ba002011-05-09 13:08:06 +0300692 if (result >= 0 && cdev->delayed_status)
693 result = USB_GADGET_DELAYED_STATUS;
David Brownell40982be2008-06-19 17:52:58 -0700694 return result;
695}
696
697/**
698 * usb_add_config() - add a configuration to a device.
699 * @cdev: wraps the USB gadget
700 * @config: the configuration, with bConfigurationValue assigned
Uwe Kleine-Königc9bfff92010-08-12 17:43:55 +0200701 * @bind: the configuration's bind function
David Brownell40982be2008-06-19 17:52:58 -0700702 * Context: single threaded during gadget setup
703 *
Uwe Kleine-Königc9bfff92010-08-12 17:43:55 +0200704 * One of the main tasks of a composite @bind() routine is to
David Brownell40982be2008-06-19 17:52:58 -0700705 * add each of the configurations it supports, using this routine.
706 *
Uwe Kleine-Königc9bfff92010-08-12 17:43:55 +0200707 * This function returns the value of the configuration's @bind(), which
David Brownell40982be2008-06-19 17:52:58 -0700708 * is zero for success else a negative errno value. Binding configurations
709 * assigns global resources including string IDs, and per-configuration
710 * resources such as interface IDs and endpoints.
711 */
Michal Nazarewicz28824b12010-05-05 12:53:13 +0200712int usb_add_config(struct usb_composite_dev *cdev,
Uwe Kleine-Königc9bfff92010-08-12 17:43:55 +0200713 struct usb_configuration *config,
714 int (*bind)(struct usb_configuration *))
David Brownell40982be2008-06-19 17:52:58 -0700715{
716 int status = -EINVAL;
717 struct usb_configuration *c;
718
719 DBG(cdev, "adding config #%u '%s'/%p\n",
720 config->bConfigurationValue,
721 config->label, config);
722
Uwe Kleine-Königc9bfff92010-08-12 17:43:55 +0200723 if (!config->bConfigurationValue || !bind)
David Brownell40982be2008-06-19 17:52:58 -0700724 goto done;
725
726 /* Prevent duplicate configuration identifiers */
727 list_for_each_entry(c, &cdev->configs, list) {
728 if (c->bConfigurationValue == config->bConfigurationValue) {
729 status = -EBUSY;
730 goto done;
731 }
732 }
733
734 config->cdev = cdev;
735 list_add_tail(&config->list, &cdev->configs);
736
737 INIT_LIST_HEAD(&config->functions);
738 config->next_interface_id = 0;
Benoit Goby9c507c72011-12-13 16:01:41 -0800739 memset(config->interface, 0, sizeof(config->interface));
David Brownell40982be2008-06-19 17:52:58 -0700740
Uwe Kleine-Königc9bfff92010-08-12 17:43:55 +0200741 status = bind(config);
David Brownell40982be2008-06-19 17:52:58 -0700742 if (status < 0) {
743 list_del(&config->list);
744 config->cdev = NULL;
745 } else {
746 unsigned i;
747
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300748 DBG(cdev, "cfg %d/%p speeds:%s%s%s\n",
David Brownell40982be2008-06-19 17:52:58 -0700749 config->bConfigurationValue, config,
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +0300750 config->superspeed ? " super" : "",
David Brownell40982be2008-06-19 17:52:58 -0700751 config->highspeed ? " high" : "",
752 config->fullspeed
753 ? (gadget_is_dualspeed(cdev->gadget)
754 ? " full"
755 : " full/low")
756 : "");
757
758 for (i = 0; i < MAX_CONFIG_INTERFACES; i++) {
759 struct usb_function *f = config->interface[i];
760
761 if (!f)
762 continue;
763 DBG(cdev, " interface %d = %s/%p\n",
764 i, f->name, f);
765 }
766 }
767
Uwe Kleine-Königc9bfff92010-08-12 17:43:55 +0200768 /* set_alt(), or next bind(), sets up
David Brownell40982be2008-06-19 17:52:58 -0700769 * ep->driver_data as needed.
770 */
771 usb_ep_autoconfig_reset(cdev->gadget);
772
773done:
774 if (status)
775 DBG(cdev, "added config '%s'/%u --> %d\n", config->label,
776 config->bConfigurationValue, status);
777 return status;
778}
779
Benoit Gobybe694522012-05-15 20:44:33 -0700780static int unbind_config(struct usb_composite_dev *cdev,
Benoit Goby894eecb2011-12-13 16:16:31 -0800781 struct usb_configuration *config)
782{
783 while (!list_empty(&config->functions)) {
784 struct usb_function *f;
785
786 f = list_first_entry(&config->functions,
787 struct usb_function, list);
788 list_del(&f->list);
789 if (f->unbind) {
790 DBG(cdev, "unbind function '%s'/%p\n", f->name, f);
791 f->unbind(config, f);
792 /* may free memory for "f" */
793 }
794 }
Benoit Goby894eecb2011-12-13 16:16:31 -0800795 if (config->unbind) {
796 DBG(cdev, "unbind config '%s'/%p\n", config->label, config);
797 config->unbind(config);
798 /* may free memory for "c" */
799 }
800 return 0;
801}
802
803/**
804 * usb_remove_config() - remove a configuration from a device.
805 * @cdev: wraps the USB gadget
806 * @config: the configuration
807 *
808 * Drivers must call usb_gadget_disconnect before calling this function
809 * to disconnect the device from the host and make sure the host will not
810 * try to enumerate the device while we are changing the config list.
811 */
812int usb_remove_config(struct usb_composite_dev *cdev,
813 struct usb_configuration *config)
814{
815 unsigned long flags;
816
817 spin_lock_irqsave(&cdev->lock, flags);
818
819 if (cdev->config == config)
820 reset_config(cdev);
821
Benoit Gobybe694522012-05-15 20:44:33 -0700822 list_del(&config->list);
823
Benoit Goby894eecb2011-12-13 16:16:31 -0800824 spin_unlock_irqrestore(&cdev->lock, flags);
825
Benoit Gobybe694522012-05-15 20:44:33 -0700826 return unbind_config(cdev, config);
Benoit Goby894eecb2011-12-13 16:16:31 -0800827}
828
David Brownell40982be2008-06-19 17:52:58 -0700829/*-------------------------------------------------------------------------*/
830
831/* We support strings in multiple languages ... string descriptor zero
832 * says which languages are supported. The typical case will be that
833 * only one language (probably English) is used, with I18N handled on
834 * the host side.
835 */
836
837static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf)
838{
839 const struct usb_gadget_strings *s;
840 u16 language;
841 __le16 *tmp;
842
843 while (*sp) {
844 s = *sp;
845 language = cpu_to_le16(s->language);
846 for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) {
847 if (*tmp == language)
848 goto repeat;
849 }
850 *tmp++ = language;
851repeat:
852 sp++;
853 }
854}
855
856static int lookup_string(
857 struct usb_gadget_strings **sp,
858 void *buf,
859 u16 language,
860 int id
861)
862{
863 struct usb_gadget_strings *s;
864 int value;
865
866 while (*sp) {
867 s = *sp++;
868 if (s->language != language)
869 continue;
870 value = usb_gadget_get_string(s, id, buf);
871 if (value > 0)
872 return value;
873 }
874 return -EINVAL;
875}
876
877static int get_string(struct usb_composite_dev *cdev,
878 void *buf, u16 language, int id)
879{
880 struct usb_configuration *c;
881 struct usb_function *f;
882 int len;
Michal Nazarewiczad1a8102010-08-12 17:43:46 +0200883 const char *str;
David Brownell40982be2008-06-19 17:52:58 -0700884
885 /* Yes, not only is USB's I18N support probably more than most
886 * folk will ever care about ... also, it's all supported here.
887 * (Except for UTF8 support for Unicode's "Astral Planes".)
888 */
889
890 /* 0 == report all available language codes */
891 if (id == 0) {
892 struct usb_string_descriptor *s = buf;
893 struct usb_gadget_strings **sp;
894
895 memset(s, 0, 256);
896 s->bDescriptorType = USB_DT_STRING;
897
898 sp = composite->strings;
899 if (sp)
900 collect_langs(sp, s->wData);
901
902 list_for_each_entry(c, &cdev->configs, list) {
903 sp = c->strings;
904 if (sp)
905 collect_langs(sp, s->wData);
906
907 list_for_each_entry(f, &c->functions, list) {
908 sp = f->strings;
909 if (sp)
910 collect_langs(sp, s->wData);
911 }
912 }
913
Roel Kluin417b57b2009-08-06 16:09:51 -0700914 for (len = 0; len <= 126 && s->wData[len]; len++)
David Brownell40982be2008-06-19 17:52:58 -0700915 continue;
916 if (!len)
917 return -EINVAL;
918
919 s->bLength = 2 * (len + 1);
920 return s->bLength;
921 }
922
Michal Nazarewiczad1a8102010-08-12 17:43:46 +0200923 /* Otherwise, look up and return a specified string. First
924 * check if the string has not been overridden.
925 */
926 if (cdev->manufacturer_override == id)
927 str = iManufacturer ?: composite->iManufacturer ?:
928 composite_manufacturer;
929 else if (cdev->product_override == id)
930 str = iProduct ?: composite->iProduct;
931 else if (cdev->serial_override == id)
932 str = iSerialNumber;
933 else
934 str = NULL;
935 if (str) {
936 struct usb_gadget_strings strings = {
937 .language = language,
938 .strings = &(struct usb_string) { 0xff, str }
939 };
940 return usb_gadget_get_string(&strings, 0xff, buf);
941 }
942
943 /* String IDs are device-scoped, so we look up each string
944 * table we're told about. These lookups are infrequent;
945 * simpler-is-better here.
David Brownell40982be2008-06-19 17:52:58 -0700946 */
947 if (composite->strings) {
948 len = lookup_string(composite->strings, buf, language, id);
949 if (len > 0)
950 return len;
951 }
952 list_for_each_entry(c, &cdev->configs, list) {
953 if (c->strings) {
954 len = lookup_string(c->strings, buf, language, id);
955 if (len > 0)
956 return len;
957 }
958 list_for_each_entry(f, &c->functions, list) {
959 if (!f->strings)
960 continue;
961 len = lookup_string(f->strings, buf, language, id);
962 if (len > 0)
963 return len;
964 }
965 }
966 return -EINVAL;
967}
968
969/**
970 * usb_string_id() - allocate an unused string ID
971 * @cdev: the device whose string descriptor IDs are being allocated
972 * Context: single threaded during gadget setup
973 *
974 * @usb_string_id() is called from bind() callbacks to allocate
975 * string IDs. Drivers for functions, configurations, or gadgets will
976 * then store that ID in the appropriate descriptors and string table.
977 *
Michal Nazarewiczf2adc4f2010-06-16 12:07:59 +0200978 * All string identifier should be allocated using this,
979 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure
980 * that for example different functions don't wrongly assign different
981 * meanings to the same identifier.
David Brownell40982be2008-06-19 17:52:58 -0700982 */
Michal Nazarewicz28824b12010-05-05 12:53:13 +0200983int usb_string_id(struct usb_composite_dev *cdev)
David Brownell40982be2008-06-19 17:52:58 -0700984{
985 if (cdev->next_string_id < 254) {
Michal Nazarewiczf2adc4f2010-06-16 12:07:59 +0200986 /* string id 0 is reserved by USB spec for list of
987 * supported languages */
988 /* 255 reserved as well? -- mina86 */
David Brownell40982be2008-06-19 17:52:58 -0700989 cdev->next_string_id++;
990 return cdev->next_string_id;
991 }
992 return -ENODEV;
993}
994
Michal Nazarewiczf2adc4f2010-06-16 12:07:59 +0200995/**
996 * usb_string_ids() - allocate unused string IDs in batch
997 * @cdev: the device whose string descriptor IDs are being allocated
998 * @str: an array of usb_string objects to assign numbers to
999 * Context: single threaded during gadget setup
1000 *
1001 * @usb_string_ids() is called from bind() callbacks to allocate
1002 * string IDs. Drivers for functions, configurations, or gadgets will
1003 * then copy IDs from the string table to the appropriate descriptors
1004 * and string table for other languages.
1005 *
1006 * All string identifier should be allocated using this,
1007 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1008 * example different functions don't wrongly assign different meanings
1009 * to the same identifier.
1010 */
1011int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str)
1012{
1013 int next = cdev->next_string_id;
1014
1015 for (; str->s; ++str) {
1016 if (unlikely(next >= 254))
1017 return -ENODEV;
1018 str->id = ++next;
1019 }
1020
1021 cdev->next_string_id = next;
1022
1023 return 0;
1024}
1025
1026/**
1027 * usb_string_ids_n() - allocate unused string IDs in batch
Randy Dunlapd187abb2010-08-11 12:07:13 -07001028 * @c: the device whose string descriptor IDs are being allocated
Michal Nazarewiczf2adc4f2010-06-16 12:07:59 +02001029 * @n: number of string IDs to allocate
1030 * Context: single threaded during gadget setup
1031 *
1032 * Returns the first requested ID. This ID and next @n-1 IDs are now
Randy Dunlapd187abb2010-08-11 12:07:13 -07001033 * valid IDs. At least provided that @n is non-zero because if it
Michal Nazarewiczf2adc4f2010-06-16 12:07:59 +02001034 * is, returns last requested ID which is now very useful information.
1035 *
1036 * @usb_string_ids_n() is called from bind() callbacks to allocate
1037 * string IDs. Drivers for functions, configurations, or gadgets will
1038 * then store that ID in the appropriate descriptors and string table.
1039 *
1040 * All string identifier should be allocated using this,
1041 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for
1042 * example different functions don't wrongly assign different meanings
1043 * to the same identifier.
1044 */
1045int usb_string_ids_n(struct usb_composite_dev *c, unsigned n)
1046{
1047 unsigned next = c->next_string_id;
1048 if (unlikely(n > 254 || (unsigned)next + n > 254))
1049 return -ENODEV;
1050 c->next_string_id += n;
1051 return next + 1;
1052}
1053
1054
David Brownell40982be2008-06-19 17:52:58 -07001055/*-------------------------------------------------------------------------*/
1056
1057static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
1058{
1059 if (req->status || req->actual != req->length)
1060 DBG((struct usb_composite_dev *) ep->driver_data,
1061 "setup complete --> %d, %d/%d\n",
1062 req->status, req->actual, req->length);
1063}
1064
1065/*
1066 * The setup() callback implements all the ep0 functionality that's
1067 * not handled lower down, in hardware or the hardware driver(like
1068 * device and endpoint feature flags, and their status). It's all
1069 * housekeeping for the gadget function we're implementing. Most of
1070 * the work is in config and function specific setup.
1071 */
1072static int
1073composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
1074{
1075 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1076 struct usb_request *req = cdev->req;
1077 int value = -EOPNOTSUPP;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001078 int status = 0;
David Brownell40982be2008-06-19 17:52:58 -07001079 u16 w_index = le16_to_cpu(ctrl->wIndex);
Bryan Wu08889512009-01-08 00:21:19 +08001080 u8 intf = w_index & 0xFF;
David Brownell40982be2008-06-19 17:52:58 -07001081 u16 w_value = le16_to_cpu(ctrl->wValue);
1082 u16 w_length = le16_to_cpu(ctrl->wLength);
1083 struct usb_function *f = NULL;
Laurent Pinchart52426582009-10-21 00:03:38 +02001084 u8 endp;
Vijayavardhan Vennapusa95b650a2012-01-18 12:54:01 +05301085 struct usb_configuration *c;
David Brownell40982be2008-06-19 17:52:58 -07001086
Manu Gautam8d887a12011-10-12 17:13:52 +05301087
1088 if (w_length > USB_BUFSIZ)
1089 return value;
David Brownell40982be2008-06-19 17:52:58 -07001090
1091 /* partial re-init of the response message; the function or the
1092 * gadget might need to intercept e.g. a control-OUT completion
1093 * when we delegate to it.
1094 */
1095 req->zero = 0;
1096 req->complete = composite_setup_complete;
Maulik Mankad2edb11c2011-02-22 19:08:42 +05301097 req->length = 0;
David Brownell40982be2008-06-19 17:52:58 -07001098 gadget->ep0->driver_data = cdev;
1099
1100 switch (ctrl->bRequest) {
1101
1102 /* we handle all standard USB descriptors */
1103 case USB_REQ_GET_DESCRIPTOR:
1104 if (ctrl->bRequestType != USB_DIR_IN)
1105 goto unknown;
1106 switch (w_value >> 8) {
1107
1108 case USB_DT_DEVICE:
1109 cdev->desc.bNumConfigurations =
1110 count_configs(cdev, USB_DT_DEVICE);
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001111 cdev->desc.bMaxPacketSize0 =
1112 cdev->gadget->ep0->maxpacket;
1113 if (gadget_is_superspeed(gadget)) {
Sebastian Andrzej Siewiora8f21152011-07-19 20:21:52 +02001114 if (gadget->speed >= USB_SPEED_SUPER) {
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001115 cdev->desc.bcdUSB = cpu_to_le16(0x0300);
Sebastian Andrzej Siewiora8f21152011-07-19 20:21:52 +02001116 cdev->desc.bMaxPacketSize0 = 9;
1117 } else {
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001118 cdev->desc.bcdUSB = cpu_to_le16(0x0210);
Sebastian Andrzej Siewiora8f21152011-07-19 20:21:52 +02001119 }
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001120 }
1121
David Brownell40982be2008-06-19 17:52:58 -07001122 value = min(w_length, (u16) sizeof cdev->desc);
1123 memcpy(req->buf, &cdev->desc, value);
1124 break;
1125 case USB_DT_DEVICE_QUALIFIER:
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001126 if (!gadget_is_dualspeed(gadget) ||
1127 gadget->speed >= USB_SPEED_SUPER)
David Brownell40982be2008-06-19 17:52:58 -07001128 break;
1129 device_qual(cdev);
1130 value = min_t(int, w_length,
1131 sizeof(struct usb_qualifier_descriptor));
1132 break;
1133 case USB_DT_OTHER_SPEED_CONFIG:
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001134 if (!gadget_is_dualspeed(gadget) ||
1135 gadget->speed >= USB_SPEED_SUPER)
David Brownell40982be2008-06-19 17:52:58 -07001136 break;
1137 /* FALLTHROUGH */
1138 case USB_DT_CONFIG:
1139 value = config_desc(cdev, w_value);
1140 if (value >= 0)
1141 value = min(w_length, (u16) value);
1142 break;
Vijayavardhan Vennapusa95b650a2012-01-18 12:54:01 +05301143 case USB_DT_OTG:
1144 if (!gadget_is_otg(gadget))
1145 break;
1146 c = list_first_entry(&cdev->configs,
1147 struct usb_configuration, list);
1148 if (c && c->descriptors)
1149 value = usb_find_descriptor_fillbuf(req->buf,
1150 USB_BUFSIZ, c->descriptors,
1151 USB_DT_OTG);
1152 break;
David Brownell40982be2008-06-19 17:52:58 -07001153 case USB_DT_STRING:
1154 value = get_string(cdev, req->buf,
1155 w_index, w_value & 0xff);
1156 if (value >= 0)
1157 value = min(w_length, (u16) value);
1158 break;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001159 case USB_DT_BOS:
1160 if (gadget_is_superspeed(gadget)) {
1161 value = bos_desc(cdev);
1162 value = min(w_length, (u16) value);
1163 }
1164 break;
David Brownell40982be2008-06-19 17:52:58 -07001165 }
1166 break;
1167
1168 /* any number of configs can work */
1169 case USB_REQ_SET_CONFIGURATION:
1170 if (ctrl->bRequestType != 0)
1171 goto unknown;
1172 if (gadget_is_otg(gadget)) {
1173 if (gadget->a_hnp_support)
1174 DBG(cdev, "HNP available\n");
1175 else if (gadget->a_alt_hnp_support)
1176 DBG(cdev, "HNP on another port\n");
1177 else
1178 VDBG(cdev, "HNP inactive\n");
1179 }
1180 spin_lock(&cdev->lock);
1181 value = set_config(cdev, ctrl, w_value);
1182 spin_unlock(&cdev->lock);
1183 break;
1184 case USB_REQ_GET_CONFIGURATION:
1185 if (ctrl->bRequestType != USB_DIR_IN)
1186 goto unknown;
1187 if (cdev->config)
1188 *(u8 *)req->buf = cdev->config->bConfigurationValue;
1189 else
1190 *(u8 *)req->buf = 0;
1191 value = min(w_length, (u16) 1);
1192 break;
1193
1194 /* function drivers must handle get/set altsetting; if there's
1195 * no get() method, we know only altsetting zero works.
1196 */
1197 case USB_REQ_SET_INTERFACE:
1198 if (ctrl->bRequestType != USB_RECIP_INTERFACE)
1199 goto unknown;
Jassi Brarff085de2011-02-06 17:39:17 +09001200 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
David Brownell40982be2008-06-19 17:52:58 -07001201 break;
Bryan Wu08889512009-01-08 00:21:19 +08001202 f = cdev->config->interface[intf];
David Brownell40982be2008-06-19 17:52:58 -07001203 if (!f)
1204 break;
Bryan Wudd4dff82009-01-08 00:21:18 +08001205 if (w_value && !f->set_alt)
David Brownell40982be2008-06-19 17:52:58 -07001206 break;
1207 value = f->set_alt(f, w_index, w_value);
Roger Quadros1b9ba002011-05-09 13:08:06 +03001208 if (value == USB_GADGET_DELAYED_STATUS) {
1209 DBG(cdev,
1210 "%s: interface %d (%s) requested delayed status\n",
1211 __func__, intf, f->name);
1212 cdev->delayed_status++;
1213 DBG(cdev, "delayed_status count %d\n",
1214 cdev->delayed_status);
1215 }
David Brownell40982be2008-06-19 17:52:58 -07001216 break;
1217 case USB_REQ_GET_INTERFACE:
1218 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
1219 goto unknown;
Jassi Brarff085de2011-02-06 17:39:17 +09001220 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
David Brownell40982be2008-06-19 17:52:58 -07001221 break;
Bryan Wu08889512009-01-08 00:21:19 +08001222 f = cdev->config->interface[intf];
David Brownell40982be2008-06-19 17:52:58 -07001223 if (!f)
1224 break;
1225 /* lots of interfaces only need altsetting zero... */
1226 value = f->get_alt ? f->get_alt(f, w_index) : 0;
1227 if (value < 0)
1228 break;
1229 *((u8 *)req->buf) = value;
1230 value = min(w_length, (u16) 1);
1231 break;
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001232
1233 /*
1234 * USB 3.0 additions:
1235 * Function driver should handle get_status request. If such cb
1236 * wasn't supplied we respond with default value = 0
1237 * Note: function driver should supply such cb only for the first
1238 * interface of the function
1239 */
1240 case USB_REQ_GET_STATUS:
1241 if (!gadget_is_superspeed(gadget))
1242 goto unknown;
1243 if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
1244 goto unknown;
1245 value = 2; /* This is the length of the get_status reply */
1246 put_unaligned_le16(0, req->buf);
1247 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1248 break;
1249 f = cdev->config->interface[intf];
1250 if (!f)
1251 break;
1252 status = f->get_status ? f->get_status(f) : 0;
1253 if (status < 0)
1254 break;
1255 put_unaligned_le16(status & 0x0000ffff, req->buf);
1256 break;
1257 /*
1258 * Function drivers should handle SetFeature/ClearFeature
1259 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
1260 * only for the first interface of the function
1261 */
1262 case USB_REQ_CLEAR_FEATURE:
1263 case USB_REQ_SET_FEATURE:
1264 if (!gadget_is_superspeed(gadget))
1265 goto unknown;
1266 if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE))
1267 goto unknown;
1268 switch (w_value) {
1269 case USB_INTRF_FUNC_SUSPEND:
1270 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
1271 break;
1272 f = cdev->config->interface[intf];
1273 if (!f)
1274 break;
1275 value = 0;
1276 if (f->func_suspend)
1277 value = f->func_suspend(f, w_index >> 8);
1278 if (value < 0) {
1279 ERROR(cdev,
1280 "func_suspend() returned error %d\n",
1281 value);
1282 value = 0;
1283 }
1284 break;
1285 }
1286 break;
David Brownell40982be2008-06-19 17:52:58 -07001287 default:
1288unknown:
1289 VDBG(cdev,
1290 "non-core control req%02x.%02x v%04x i%04x l%d\n",
1291 ctrl->bRequestType, ctrl->bRequest,
1292 w_value, w_index, w_length);
1293
Laurent Pinchart52426582009-10-21 00:03:38 +02001294 /* functions always handle their interfaces and endpoints...
1295 * punt other recipients (other, WUSB, ...) to the current
David Brownell40982be2008-06-19 17:52:58 -07001296 * configuration code.
1297 *
1298 * REVISIT it could make sense to let the composite device
1299 * take such requests too, if that's ever needed: to work
1300 * in config 0, etc.
1301 */
Laurent Pinchart52426582009-10-21 00:03:38 +02001302 switch (ctrl->bRequestType & USB_RECIP_MASK) {
1303 case USB_RECIP_INTERFACE:
Jassi Brarff085de2011-02-06 17:39:17 +09001304 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
Maulik Mankad3c47eb02011-01-13 18:19:56 +05301305 break;
1306 f = cdev->config->interface[intf];
Laurent Pinchart52426582009-10-21 00:03:38 +02001307 break;
1308
1309 case USB_RECIP_ENDPOINT:
1310 endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f);
1311 list_for_each_entry(f, &cdev->config->functions, list) {
1312 if (test_bit(endp, f->endpoints))
1313 break;
1314 }
1315 if (&f->list == &cdev->config->functions)
David Brownell40982be2008-06-19 17:52:58 -07001316 f = NULL;
Laurent Pinchart52426582009-10-21 00:03:38 +02001317 break;
David Brownell40982be2008-06-19 17:52:58 -07001318 }
Laurent Pinchart52426582009-10-21 00:03:38 +02001319
1320 if (f && f->setup)
1321 value = f->setup(f, ctrl);
1322 else {
David Brownell40982be2008-06-19 17:52:58 -07001323 struct usb_configuration *c;
1324
1325 c = cdev->config;
1326 if (c && c->setup)
1327 value = c->setup(c, ctrl);
1328 }
1329
1330 goto done;
1331 }
1332
1333 /* respond with data transfer before status phase? */
Roger Quadros1b9ba002011-05-09 13:08:06 +03001334 if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) {
David Brownell40982be2008-06-19 17:52:58 -07001335 req->length = value;
1336 req->zero = value < w_length;
1337 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1338 if (value < 0) {
1339 DBG(cdev, "ep_queue --> %d\n", value);
1340 req->status = 0;
1341 composite_setup_complete(gadget->ep0, req);
1342 }
Roger Quadros1b9ba002011-05-09 13:08:06 +03001343 } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) {
1344 WARN(cdev,
1345 "%s: Delayed status not supported for w_length != 0",
1346 __func__);
David Brownell40982be2008-06-19 17:52:58 -07001347 }
1348
1349done:
1350 /* device either stalls (value < 0) or reports success */
1351 return value;
1352}
1353
1354static void composite_disconnect(struct usb_gadget *gadget)
1355{
1356 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1357 unsigned long flags;
1358
1359 /* REVISIT: should we have config and device level
1360 * disconnect callbacks?
1361 */
1362 spin_lock_irqsave(&cdev->lock, flags);
1363 if (cdev->config)
1364 reset_config(cdev);
Michal Nazarewicz3f3e12d2010-06-21 13:57:08 +02001365 if (composite->disconnect)
1366 composite->disconnect(cdev);
David Brownell40982be2008-06-19 17:52:58 -07001367 spin_unlock_irqrestore(&cdev->lock, flags);
1368}
1369
1370/*-------------------------------------------------------------------------*/
1371
Fabien Chouteauf48cf802010-04-23 14:21:26 +02001372static ssize_t composite_show_suspended(struct device *dev,
1373 struct device_attribute *attr,
1374 char *buf)
1375{
1376 struct usb_gadget *gadget = dev_to_usb_gadget(dev);
1377 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1378
1379 return sprintf(buf, "%d\n", cdev->suspended);
1380}
1381
1382static DEVICE_ATTR(suspended, 0444, composite_show_suspended, NULL);
1383
Michal Nazarewicz28824b12010-05-05 12:53:13 +02001384static void
David Brownell40982be2008-06-19 17:52:58 -07001385composite_unbind(struct usb_gadget *gadget)
1386{
1387 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1388
1389 /* composite_disconnect() must already have been called
1390 * by the underlying peripheral controller driver!
1391 * so there's no i/o concurrency that could affect the
1392 * state protected by cdev->lock.
1393 */
1394 WARN_ON(cdev->config);
1395
1396 while (!list_empty(&cdev->configs)) {
1397 struct usb_configuration *c;
David Brownell40982be2008-06-19 17:52:58 -07001398 c = list_first_entry(&cdev->configs,
1399 struct usb_configuration, list);
Benoit Gobybe694522012-05-15 20:44:33 -07001400 list_del(&c->list);
1401 unbind_config(cdev, c);
David Brownell40982be2008-06-19 17:52:58 -07001402 }
1403 if (composite->unbind)
1404 composite->unbind(cdev);
1405
1406 if (cdev->req) {
1407 kfree(cdev->req->buf);
1408 usb_ep_free_request(gadget->ep0, cdev->req);
1409 }
Pavankumar Kondetidaba5802010-12-16 14:32:25 +05301410 device_remove_file(&gadget->dev, &dev_attr_suspended);
David Brownell40982be2008-06-19 17:52:58 -07001411 kfree(cdev);
1412 set_gadget_data(gadget, NULL);
1413 composite = NULL;
1414}
1415
Michal Nazarewiczad1a8102010-08-12 17:43:46 +02001416static u8 override_id(struct usb_composite_dev *cdev, u8 *desc)
David Brownell40982be2008-06-19 17:52:58 -07001417{
Michal Nazarewiczad1a8102010-08-12 17:43:46 +02001418 if (!*desc) {
1419 int ret = usb_string_id(cdev);
1420 if (unlikely(ret < 0))
1421 WARNING(cdev, "failed to override string ID\n");
1422 else
1423 *desc = ret;
David Brownell40982be2008-06-19 17:52:58 -07001424 }
David Brownell40982be2008-06-19 17:52:58 -07001425
Michal Nazarewiczad1a8102010-08-12 17:43:46 +02001426 return *desc;
David Brownell40982be2008-06-19 17:52:58 -07001427}
1428
Michal Nazarewicz28824b12010-05-05 12:53:13 +02001429static int composite_bind(struct usb_gadget *gadget)
David Brownell40982be2008-06-19 17:52:58 -07001430{
1431 struct usb_composite_dev *cdev;
1432 int status = -ENOMEM;
1433
1434 cdev = kzalloc(sizeof *cdev, GFP_KERNEL);
1435 if (!cdev)
1436 return status;
1437
1438 spin_lock_init(&cdev->lock);
1439 cdev->gadget = gadget;
1440 set_gadget_data(gadget, cdev);
1441 INIT_LIST_HEAD(&cdev->configs);
1442
1443 /* preallocate control response and buffer */
1444 cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
1445 if (!cdev->req)
1446 goto fail;
1447 cdev->req->buf = kmalloc(USB_BUFSIZ, GFP_KERNEL);
1448 if (!cdev->req->buf)
1449 goto fail;
1450 cdev->req->complete = composite_setup_complete;
1451 gadget->ep0->driver_data = cdev;
1452
1453 cdev->bufsiz = USB_BUFSIZ;
1454 cdev->driver = composite;
1455
Parirajan Muthalagu37b58012010-08-25 16:33:26 +05301456 /*
1457 * As per USB compliance update, a device that is actively drawing
1458 * more than 100mA from USB must report itself as bus-powered in
1459 * the GetStatus(DEVICE) call.
1460 */
1461 if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW)
1462 usb_gadget_set_selfpowered(gadget);
David Brownell40982be2008-06-19 17:52:58 -07001463
1464 /* interface and string IDs start at zero via kzalloc.
1465 * we force endpoints to start unassigned; few controller
1466 * drivers will zero ep->driver_data.
1467 */
1468 usb_ep_autoconfig_reset(cdev->gadget);
1469
1470 /* composite gadget needs to assign strings for whole device (like
1471 * serial number), register function drivers, potentially update
1472 * power state and consumption, etc
1473 */
Michal Nazarewicz07a18bd2010-08-12 17:43:54 +02001474 status = composite_gadget_bind(cdev);
David Brownell40982be2008-06-19 17:52:58 -07001475 if (status < 0)
1476 goto fail;
1477
1478 cdev->desc = *composite->dev;
David Brownell40982be2008-06-19 17:52:58 -07001479
Greg Kroah-Hartmandbb442b2010-12-16 15:52:30 -08001480 /* standardized runtime overrides for device ID data */
1481 if (idVendor)
1482 cdev->desc.idVendor = cpu_to_le16(idVendor);
1483 if (idProduct)
1484 cdev->desc.idProduct = cpu_to_le16(idProduct);
1485 if (bcdDevice)
1486 cdev->desc.bcdDevice = cpu_to_le16(bcdDevice);
1487
Marek Belisko78bff3c2010-10-27 10:19:01 +02001488 /* string overrides */
Michal Nazarewiczad1a8102010-08-12 17:43:46 +02001489 if (iManufacturer || !cdev->desc.iManufacturer) {
1490 if (!iManufacturer && !composite->iManufacturer &&
1491 !*composite_manufacturer)
1492 snprintf(composite_manufacturer,
1493 sizeof composite_manufacturer,
1494 "%s %s with %s",
1495 init_utsname()->sysname,
1496 init_utsname()->release,
1497 gadget->name);
David Brownell40982be2008-06-19 17:52:58 -07001498
Michal Nazarewiczad1a8102010-08-12 17:43:46 +02001499 cdev->manufacturer_override =
1500 override_id(cdev, &cdev->desc.iManufacturer);
1501 }
1502
1503 if (iProduct || (!cdev->desc.iProduct && composite->iProduct))
1504 cdev->product_override =
1505 override_id(cdev, &cdev->desc.iProduct);
1506
1507 if (iSerialNumber)
1508 cdev->serial_override =
1509 override_id(cdev, &cdev->desc.iSerialNumber);
1510
1511 /* has userspace failed to provide a serial number? */
1512 if (composite->needs_serial && !cdev->desc.iSerialNumber)
1513 WARNING(cdev, "userspace failed to provide iSerialNumber\n");
1514
1515 /* finish up */
Fabien Chouteauf48cf802010-04-23 14:21:26 +02001516 status = device_create_file(&gadget->dev, &dev_attr_suspended);
1517 if (status)
1518 goto fail;
1519
David Brownell40982be2008-06-19 17:52:58 -07001520 INFO(cdev, "%s ready\n", composite->name);
1521 return 0;
1522
1523fail:
1524 composite_unbind(gadget);
1525 return status;
1526}
1527
1528/*-------------------------------------------------------------------------*/
1529
1530static void
1531composite_suspend(struct usb_gadget *gadget)
1532{
1533 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1534 struct usb_function *f;
1535
David Brownell89429392009-03-19 14:14:17 -07001536 /* REVISIT: should we have config level
David Brownell40982be2008-06-19 17:52:58 -07001537 * suspend/resume callbacks?
1538 */
1539 DBG(cdev, "suspend\n");
1540 if (cdev->config) {
1541 list_for_each_entry(f, &cdev->config->functions, list) {
1542 if (f->suspend)
1543 f->suspend(f);
1544 }
1545 }
David Brownell89429392009-03-19 14:14:17 -07001546 if (composite->suspend)
1547 composite->suspend(cdev);
Fabien Chouteauf48cf802010-04-23 14:21:26 +02001548
1549 cdev->suspended = 1;
Hao Wub23f2f92010-11-29 15:17:03 +08001550
1551 usb_gadget_vbus_draw(gadget, 2);
David Brownell40982be2008-06-19 17:52:58 -07001552}
1553
1554static void
1555composite_resume(struct usb_gadget *gadget)
1556{
1557 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1558 struct usb_function *f;
Hao Wub23f2f92010-11-29 15:17:03 +08001559 u8 maxpower;
David Brownell40982be2008-06-19 17:52:58 -07001560
David Brownell89429392009-03-19 14:14:17 -07001561 /* REVISIT: should we have config level
David Brownell40982be2008-06-19 17:52:58 -07001562 * suspend/resume callbacks?
1563 */
1564 DBG(cdev, "resume\n");
David Brownell89429392009-03-19 14:14:17 -07001565 if (composite->resume)
1566 composite->resume(cdev);
David Brownell40982be2008-06-19 17:52:58 -07001567 if (cdev->config) {
1568 list_for_each_entry(f, &cdev->config->functions, list) {
1569 if (f->resume)
1570 f->resume(f);
1571 }
Hao Wub23f2f92010-11-29 15:17:03 +08001572
1573 maxpower = cdev->config->bMaxPower;
1574
1575 usb_gadget_vbus_draw(gadget, maxpower ?
1576 (2 * maxpower) : CONFIG_USB_GADGET_VBUS_DRAW);
David Brownell40982be2008-06-19 17:52:58 -07001577 }
Fabien Chouteauf48cf802010-04-23 14:21:26 +02001578
1579 cdev->suspended = 0;
David Brownell40982be2008-06-19 17:52:58 -07001580}
1581
1582/*-------------------------------------------------------------------------*/
1583
1584static struct usb_gadget_driver composite_driver = {
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001585#ifdef CONFIG_USB_GADGET_SUPERSPEED
Michal Nazarewicz7177aed2011-11-19 18:27:38 +01001586 .max_speed = USB_SPEED_SUPER,
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001587#else
Michal Nazarewicz7177aed2011-11-19 18:27:38 +01001588 .max_speed = USB_SPEED_HIGH,
Tatyana Brokhmanbdb64d72011-06-29 16:41:50 +03001589#endif
David Brownell40982be2008-06-19 17:52:58 -07001590
Michal Nazarewicz915c8be2009-11-09 14:15:25 +01001591 .unbind = composite_unbind,
David Brownell40982be2008-06-19 17:52:58 -07001592
1593 .setup = composite_setup,
1594 .disconnect = composite_disconnect,
1595
1596 .suspend = composite_suspend,
1597 .resume = composite_resume,
1598
1599 .driver = {
1600 .owner = THIS_MODULE,
1601 },
1602};
1603
1604/**
Michal Nazarewicz07a18bd2010-08-12 17:43:54 +02001605 * usb_composite_probe() - register a composite driver
David Brownell40982be2008-06-19 17:52:58 -07001606 * @driver: the driver to register
Michal Nazarewicz07a18bd2010-08-12 17:43:54 +02001607 * @bind: the callback used to allocate resources that are shared across the
1608 * whole device, such as string IDs, and add its configurations using
1609 * @usb_add_config(). This may fail by returning a negative errno
1610 * value; it should return zero on successful initialization.
David Brownell40982be2008-06-19 17:52:58 -07001611 * Context: single threaded during gadget setup
1612 *
1613 * This function is used to register drivers using the composite driver
1614 * framework. The return value is zero, or a negative errno value.
1615 * Those values normally come from the driver's @bind method, which does
1616 * all the work of setting up the driver to match the hardware.
1617 *
1618 * On successful return, the gadget is ready to respond to requests from
1619 * the host, unless one of its components invokes usb_gadget_disconnect()
1620 * while it was binding. That would usually be done in order to wait for
1621 * some userspace participation.
1622 */
Jassi Brar05c3eeb2011-02-06 18:47:18 +09001623int usb_composite_probe(struct usb_composite_driver *driver,
Michal Nazarewicz07a18bd2010-08-12 17:43:54 +02001624 int (*bind)(struct usb_composite_dev *cdev))
David Brownell40982be2008-06-19 17:52:58 -07001625{
Lena Salmand092f2d2012-03-12 17:27:24 +02001626 int retval;
1627
Ido Shayevitz23dc77c2012-07-18 16:16:06 +03001628 if (!driver || !driver->dev || !bind)
David Brownell40982be2008-06-19 17:52:58 -07001629 return -EINVAL;
1630
1631 if (!driver->name)
1632 driver->name = "composite";
Jassi Brar05c3eeb2011-02-06 18:47:18 +09001633 if (!driver->iProduct)
1634 driver->iProduct = driver->name;
David Brownell40982be2008-06-19 17:52:58 -07001635 composite_driver.function = (char *) driver->name;
1636 composite_driver.driver.name = driver->name;
Michal Nazarewicz7177aed2011-11-19 18:27:38 +01001637 composite_driver.max_speed =
1638 min_t(u8, composite_driver.max_speed, driver->max_speed);
David Brownell40982be2008-06-19 17:52:58 -07001639 composite = driver;
Michal Nazarewicz07a18bd2010-08-12 17:43:54 +02001640 composite_gadget_bind = bind;
David Brownell40982be2008-06-19 17:52:58 -07001641
Lena Salmand092f2d2012-03-12 17:27:24 +02001642 retval = usb_gadget_probe_driver(&composite_driver, composite_bind);
1643 if (retval)
1644 composite = NULL;
1645 return retval;
David Brownell40982be2008-06-19 17:52:58 -07001646}
1647
1648/**
1649 * usb_composite_unregister() - unregister a composite driver
1650 * @driver: the driver to unregister
1651 *
1652 * This function is used to unregister drivers using the composite
1653 * driver framework.
1654 */
Michal Nazarewicz28824b12010-05-05 12:53:13 +02001655void usb_composite_unregister(struct usb_composite_driver *driver)
David Brownell40982be2008-06-19 17:52:58 -07001656{
1657 if (composite != driver)
1658 return;
1659 usb_gadget_unregister_driver(&composite_driver);
1660}
Roger Quadros1b9ba002011-05-09 13:08:06 +03001661
1662/**
1663 * usb_composite_setup_continue() - Continue with the control transfer
1664 * @cdev: the composite device who's control transfer was kept waiting
1665 *
1666 * This function must be called by the USB function driver to continue
1667 * with the control transfer's data/status stage in case it had requested to
1668 * delay the data/status stages. A USB function's setup handler (e.g. set_alt())
1669 * can request the composite framework to delay the setup request's data/status
1670 * stages by returning USB_GADGET_DELAYED_STATUS.
1671 */
1672void usb_composite_setup_continue(struct usb_composite_dev *cdev)
1673{
1674 int value;
1675 struct usb_request *req = cdev->req;
1676 unsigned long flags;
1677
1678 DBG(cdev, "%s\n", __func__);
1679 spin_lock_irqsave(&cdev->lock, flags);
1680
1681 if (cdev->delayed_status == 0) {
1682 WARN(cdev, "%s: Unexpected call\n", __func__);
1683
1684 } else if (--cdev->delayed_status == 0) {
1685 DBG(cdev, "%s: Completing delayed status\n", __func__);
1686 req->length = 0;
1687 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
1688 if (value < 0) {
1689 DBG(cdev, "ep_queue --> %d\n", value);
1690 req->status = 0;
1691 composite_setup_complete(cdev->gadget->ep0, req);
1692 }
1693 }
1694
1695 spin_unlock_irqrestore(&cdev->lock, flags);
1696}
1697