]>
Commit | Line | Data |
---|---|---|
40982be5 DB |
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 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | /* #define VERBOSE_DEBUG */ | |
22 | ||
23 | #include <linux/kallsyms.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/device.h> | |
ad1a8102 | 27 | #include <linux/utsname.h> |
40982be5 DB |
28 | |
29 | #include <linux/usb/composite.h> | |
bdb64d72 | 30 | #include <asm/unaligned.h> |
40982be5 DB |
31 | |
32 | /* | |
33 | * The code in this file is utility code, used to build a gadget driver | |
34 | * from one or more "function" drivers, one or more "configuration" | |
35 | * objects, and a "usb_composite_driver" by gluing them together along | |
36 | * with the relevant device-wide data. | |
37 | */ | |
38 | ||
39 | /* big enough to hold our biggest descriptor */ | |
dd0543ec | 40 | #define USB_BUFSIZ 1024 |
40982be5 DB |
41 | |
42 | static struct usb_composite_driver *composite; | |
07a18bd7 | 43 | static int (*composite_gadget_bind)(struct usb_composite_dev *cdev); |
40982be5 | 44 | |
25985edc | 45 | /* Some systems will need runtime overrides for the product identifiers |
40982be5 DB |
46 | * published in the device descriptor, either numbers or strings or both. |
47 | * String parameters are in UTF-8 (superset of ASCII's 7 bit characters). | |
48 | */ | |
49 | ||
50 | static ushort idVendor; | |
51 | module_param(idVendor, ushort, 0); | |
52 | MODULE_PARM_DESC(idVendor, "USB Vendor ID"); | |
53 | ||
54 | static ushort idProduct; | |
55 | module_param(idProduct, ushort, 0); | |
56 | MODULE_PARM_DESC(idProduct, "USB Product ID"); | |
57 | ||
58 | static ushort bcdDevice; | |
59 | module_param(bcdDevice, ushort, 0); | |
60 | MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); | |
61 | ||
62 | static char *iManufacturer; | |
63 | module_param(iManufacturer, charp, 0); | |
64 | MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); | |
65 | ||
66 | static char *iProduct; | |
67 | module_param(iProduct, charp, 0); | |
68 | MODULE_PARM_DESC(iProduct, "USB Product string"); | |
69 | ||
70 | static char *iSerialNumber; | |
71 | module_param(iSerialNumber, charp, 0); | |
72 | MODULE_PARM_DESC(iSerialNumber, "SerialNumber string"); | |
73 | ||
ad1a8102 MN |
74 | static char composite_manufacturer[50]; |
75 | ||
40982be5 | 76 | /*-------------------------------------------------------------------------*/ |
48767a4e TB |
77 | /** |
78 | * next_ep_desc() - advance to the next EP descriptor | |
79 | * @t: currect pointer within descriptor array | |
80 | * | |
81 | * Return: next EP descriptor or NULL | |
82 | * | |
83 | * Iterate over @t until either EP descriptor found or | |
84 | * NULL (that indicates end of list) encountered | |
85 | */ | |
86 | static struct usb_descriptor_header** | |
87 | next_ep_desc(struct usb_descriptor_header **t) | |
88 | { | |
89 | for (; *t; t++) { | |
90 | if ((*t)->bDescriptorType == USB_DT_ENDPOINT) | |
91 | return t; | |
92 | } | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | /* | |
97 | * for_each_ep_desc()- iterate over endpoint descriptors in the | |
98 | * descriptors list | |
99 | * @start: pointer within descriptor array. | |
100 | * @ep_desc: endpoint descriptor to use as the loop cursor | |
101 | */ | |
102 | #define for_each_ep_desc(start, ep_desc) \ | |
103 | for (ep_desc = next_ep_desc(start); \ | |
104 | ep_desc; ep_desc = next_ep_desc(ep_desc+1)) | |
105 | ||
106 | /** | |
107 | * config_ep_by_speed() - configures the given endpoint | |
108 | * according to gadget speed. | |
109 | * @g: pointer to the gadget | |
110 | * @f: usb function | |
111 | * @_ep: the endpoint to configure | |
112 | * | |
113 | * Return: error code, 0 on success | |
114 | * | |
115 | * This function chooses the right descriptors for a given | |
116 | * endpoint according to gadget speed and saves it in the | |
117 | * endpoint desc field. If the endpoint already has a descriptor | |
118 | * assigned to it - overwrites it with currently corresponding | |
119 | * descriptor. The endpoint maxpacket field is updated according | |
120 | * to the chosen descriptor. | |
121 | * Note: the supplied function should hold all the descriptors | |
122 | * for supported speeds | |
123 | */ | |
124 | int config_ep_by_speed(struct usb_gadget *g, | |
125 | struct usb_function *f, | |
126 | struct usb_ep *_ep) | |
127 | { | |
128 | struct usb_endpoint_descriptor *chosen_desc = NULL; | |
129 | struct usb_descriptor_header **speed_desc = NULL; | |
130 | ||
bdb64d72 TB |
131 | struct usb_ss_ep_comp_descriptor *comp_desc = NULL; |
132 | int want_comp_desc = 0; | |
133 | ||
48767a4e TB |
134 | struct usb_descriptor_header **d_spd; /* cursor for speed desc */ |
135 | ||
136 | if (!g || !f || !_ep) | |
137 | return -EIO; | |
138 | ||
139 | /* select desired speed */ | |
140 | switch (g->speed) { | |
bdb64d72 TB |
141 | case USB_SPEED_SUPER: |
142 | if (gadget_is_superspeed(g)) { | |
143 | speed_desc = f->ss_descriptors; | |
144 | want_comp_desc = 1; | |
145 | break; | |
146 | } | |
147 | /* else: Fall trough */ | |
48767a4e TB |
148 | case USB_SPEED_HIGH: |
149 | if (gadget_is_dualspeed(g)) { | |
150 | speed_desc = f->hs_descriptors; | |
151 | break; | |
152 | } | |
153 | /* else: fall through */ | |
154 | default: | |
155 | speed_desc = f->descriptors; | |
156 | } | |
157 | /* find descriptors */ | |
158 | for_each_ep_desc(speed_desc, d_spd) { | |
159 | chosen_desc = (struct usb_endpoint_descriptor *)*d_spd; | |
160 | if (chosen_desc->bEndpointAddress == _ep->address) | |
161 | goto ep_found; | |
162 | } | |
163 | return -EIO; | |
164 | ||
165 | ep_found: | |
166 | /* commit results */ | |
167 | _ep->maxpacket = le16_to_cpu(chosen_desc->wMaxPacketSize); | |
168 | _ep->desc = chosen_desc; | |
bdb64d72 TB |
169 | _ep->comp_desc = NULL; |
170 | _ep->maxburst = 0; | |
171 | _ep->mult = 0; | |
172 | if (!want_comp_desc) | |
173 | return 0; | |
48767a4e | 174 | |
bdb64d72 TB |
175 | /* |
176 | * Companion descriptor should follow EP descriptor | |
177 | * USB 3.0 spec, #9.6.7 | |
178 | */ | |
179 | comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd); | |
180 | if (!comp_desc || | |
181 | (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP)) | |
182 | return -EIO; | |
183 | _ep->comp_desc = comp_desc; | |
184 | if (g->speed == USB_SPEED_SUPER) { | |
185 | switch (usb_endpoint_type(_ep->desc)) { | |
186 | case USB_ENDPOINT_XFER_BULK: | |
187 | case USB_ENDPOINT_XFER_INT: | |
188 | _ep->maxburst = comp_desc->bMaxBurst; | |
189 | break; | |
190 | case USB_ENDPOINT_XFER_ISOC: | |
191 | /* mult: bits 1:0 of bmAttributes */ | |
192 | _ep->mult = comp_desc->bmAttributes & 0x3; | |
193 | break; | |
194 | default: | |
195 | /* Do nothing for control endpoints */ | |
196 | break; | |
197 | } | |
198 | } | |
48767a4e TB |
199 | return 0; |
200 | } | |
40982be5 DB |
201 | |
202 | /** | |
203 | * usb_add_function() - add a function to a configuration | |
204 | * @config: the configuration | |
205 | * @function: the function being added | |
206 | * Context: single threaded during gadget setup | |
207 | * | |
208 | * After initialization, each configuration must have one or more | |
209 | * functions added to it. Adding a function involves calling its @bind() | |
210 | * method to allocate resources such as interface and string identifiers | |
211 | * and endpoints. | |
212 | * | |
213 | * This function returns the value of the function's bind(), which is | |
214 | * zero for success else a negative errno value. | |
215 | */ | |
28824b18 | 216 | int usb_add_function(struct usb_configuration *config, |
40982be5 DB |
217 | struct usb_function *function) |
218 | { | |
219 | int value = -EINVAL; | |
220 | ||
221 | DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n", | |
222 | function->name, function, | |
223 | config->label, config); | |
224 | ||
225 | if (!function->set_alt || !function->disable) | |
226 | goto done; | |
227 | ||
228 | function->config = config; | |
229 | list_add_tail(&function->list, &config->functions); | |
230 | ||
231 | /* REVISIT *require* function->bind? */ | |
232 | if (function->bind) { | |
233 | value = function->bind(config, function); | |
234 | if (value < 0) { | |
235 | list_del(&function->list); | |
236 | function->config = NULL; | |
237 | } | |
238 | } else | |
239 | value = 0; | |
240 | ||
241 | /* We allow configurations that don't work at both speeds. | |
242 | * If we run into a lowspeed Linux system, treat it the same | |
243 | * as full speed ... it's the function drivers that will need | |
244 | * to avoid bulk and ISO transfers. | |
245 | */ | |
246 | if (!config->fullspeed && function->descriptors) | |
247 | config->fullspeed = true; | |
248 | if (!config->highspeed && function->hs_descriptors) | |
249 | config->highspeed = true; | |
bdb64d72 TB |
250 | if (!config->superspeed && function->ss_descriptors) |
251 | config->superspeed = true; | |
40982be5 DB |
252 | |
253 | done: | |
254 | if (value) | |
255 | DBG(config->cdev, "adding '%s'/%p --> %d\n", | |
256 | function->name, function, value); | |
257 | return value; | |
258 | } | |
259 | ||
60beed95 DB |
260 | /** |
261 | * usb_function_deactivate - prevent function and gadget enumeration | |
262 | * @function: the function that isn't yet ready to respond | |
263 | * | |
264 | * Blocks response of the gadget driver to host enumeration by | |
265 | * preventing the data line pullup from being activated. This is | |
266 | * normally called during @bind() processing to change from the | |
267 | * initial "ready to respond" state, or when a required resource | |
268 | * becomes available. | |
269 | * | |
270 | * For example, drivers that serve as a passthrough to a userspace | |
271 | * daemon can block enumeration unless that daemon (such as an OBEX, | |
272 | * MTP, or print server) is ready to handle host requests. | |
273 | * | |
274 | * Not all systems support software control of their USB peripheral | |
275 | * data pullups. | |
276 | * | |
277 | * Returns zero on success, else negative errno. | |
278 | */ | |
279 | int usb_function_deactivate(struct usb_function *function) | |
280 | { | |
281 | struct usb_composite_dev *cdev = function->config->cdev; | |
b2bdf3a7 | 282 | unsigned long flags; |
60beed95 DB |
283 | int status = 0; |
284 | ||
b2bdf3a7 | 285 | spin_lock_irqsave(&cdev->lock, flags); |
60beed95 DB |
286 | |
287 | if (cdev->deactivations == 0) | |
288 | status = usb_gadget_disconnect(cdev->gadget); | |
289 | if (status == 0) | |
290 | cdev->deactivations++; | |
291 | ||
b2bdf3a7 | 292 | spin_unlock_irqrestore(&cdev->lock, flags); |
60beed95 DB |
293 | return status; |
294 | } | |
295 | ||
296 | /** | |
297 | * usb_function_activate - allow function and gadget enumeration | |
298 | * @function: function on which usb_function_activate() was called | |
299 | * | |
300 | * Reverses effect of usb_function_deactivate(). If no more functions | |
301 | * are delaying their activation, the gadget driver will respond to | |
302 | * host enumeration procedures. | |
303 | * | |
304 | * Returns zero on success, else negative errno. | |
305 | */ | |
306 | int usb_function_activate(struct usb_function *function) | |
307 | { | |
308 | struct usb_composite_dev *cdev = function->config->cdev; | |
309 | int status = 0; | |
310 | ||
311 | spin_lock(&cdev->lock); | |
312 | ||
313 | if (WARN_ON(cdev->deactivations == 0)) | |
314 | status = -EINVAL; | |
315 | else { | |
316 | cdev->deactivations--; | |
317 | if (cdev->deactivations == 0) | |
318 | status = usb_gadget_connect(cdev->gadget); | |
319 | } | |
320 | ||
321 | spin_unlock(&cdev->lock); | |
322 | return status; | |
323 | } | |
324 | ||
40982be5 DB |
325 | /** |
326 | * usb_interface_id() - allocate an unused interface ID | |
327 | * @config: configuration associated with the interface | |
328 | * @function: function handling the interface | |
329 | * Context: single threaded during gadget setup | |
330 | * | |
331 | * usb_interface_id() is called from usb_function.bind() callbacks to | |
332 | * allocate new interface IDs. The function driver will then store that | |
333 | * ID in interface, association, CDC union, and other descriptors. It | |
25985edc | 334 | * will also handle any control requests targeted at that interface, |
40982be5 DB |
335 | * particularly changing its altsetting via set_alt(). There may |
336 | * also be class-specific or vendor-specific requests to handle. | |
337 | * | |
338 | * All interface identifier should be allocated using this routine, to | |
339 | * ensure that for example different functions don't wrongly assign | |
340 | * different meanings to the same identifier. Note that since interface | |
25985edc | 341 | * identifiers are configuration-specific, functions used in more than |
40982be5 DB |
342 | * one configuration (or more than once in a given configuration) need |
343 | * multiple versions of the relevant descriptors. | |
344 | * | |
345 | * Returns the interface ID which was allocated; or -ENODEV if no | |
346 | * more interface IDs can be allocated. | |
347 | */ | |
28824b18 | 348 | int usb_interface_id(struct usb_configuration *config, |
40982be5 DB |
349 | struct usb_function *function) |
350 | { | |
351 | unsigned id = config->next_interface_id; | |
352 | ||
353 | if (id < MAX_CONFIG_INTERFACES) { | |
354 | config->interface[id] = function; | |
355 | config->next_interface_id = id + 1; | |
356 | return id; | |
357 | } | |
358 | return -ENODEV; | |
359 | } | |
360 | ||
361 | static int config_buf(struct usb_configuration *config, | |
362 | enum usb_device_speed speed, void *buf, u8 type) | |
363 | { | |
364 | struct usb_config_descriptor *c = buf; | |
365 | void *next = buf + USB_DT_CONFIG_SIZE; | |
366 | int len = USB_BUFSIZ - USB_DT_CONFIG_SIZE; | |
367 | struct usb_function *f; | |
368 | int status; | |
369 | ||
370 | /* write the config descriptor */ | |
371 | c = buf; | |
372 | c->bLength = USB_DT_CONFIG_SIZE; | |
373 | c->bDescriptorType = type; | |
374 | /* wTotalLength is written later */ | |
375 | c->bNumInterfaces = config->next_interface_id; | |
376 | c->bConfigurationValue = config->bConfigurationValue; | |
377 | c->iConfiguration = config->iConfiguration; | |
378 | c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes; | |
36e893d2 | 379 | c->bMaxPower = config->bMaxPower ? : (CONFIG_USB_GADGET_VBUS_DRAW / 2); |
40982be5 DB |
380 | |
381 | /* There may be e.g. OTG descriptors */ | |
382 | if (config->descriptors) { | |
383 | status = usb_descriptor_fillbuf(next, len, | |
384 | config->descriptors); | |
385 | if (status < 0) | |
386 | return status; | |
387 | len -= status; | |
388 | next += status; | |
389 | } | |
390 | ||
391 | /* add each function's descriptors */ | |
392 | list_for_each_entry(f, &config->functions, list) { | |
393 | struct usb_descriptor_header **descriptors; | |
394 | ||
bdb64d72 TB |
395 | switch (speed) { |
396 | case USB_SPEED_SUPER: | |
397 | descriptors = f->ss_descriptors; | |
398 | break; | |
399 | case USB_SPEED_HIGH: | |
40982be5 | 400 | descriptors = f->hs_descriptors; |
bdb64d72 TB |
401 | break; |
402 | default: | |
40982be5 | 403 | descriptors = f->descriptors; |
bdb64d72 TB |
404 | } |
405 | ||
40982be5 DB |
406 | if (!descriptors) |
407 | continue; | |
408 | status = usb_descriptor_fillbuf(next, len, | |
409 | (const struct usb_descriptor_header **) descriptors); | |
410 | if (status < 0) | |
411 | return status; | |
412 | len -= status; | |
413 | next += status; | |
414 | } | |
415 | ||
416 | len = next - buf; | |
417 | c->wTotalLength = cpu_to_le16(len); | |
418 | return len; | |
419 | } | |
420 | ||
421 | static int config_desc(struct usb_composite_dev *cdev, unsigned w_value) | |
422 | { | |
423 | struct usb_gadget *gadget = cdev->gadget; | |
424 | struct usb_configuration *c; | |
425 | u8 type = w_value >> 8; | |
426 | enum usb_device_speed speed = USB_SPEED_UNKNOWN; | |
427 | ||
bdb64d72 TB |
428 | if (gadget->speed == USB_SPEED_SUPER) |
429 | speed = gadget->speed; | |
430 | else if (gadget_is_dualspeed(gadget)) { | |
431 | int hs = 0; | |
40982be5 DB |
432 | if (gadget->speed == USB_SPEED_HIGH) |
433 | hs = 1; | |
434 | if (type == USB_DT_OTHER_SPEED_CONFIG) | |
435 | hs = !hs; | |
436 | if (hs) | |
437 | speed = USB_SPEED_HIGH; | |
438 | ||
439 | } | |
440 | ||
441 | /* This is a lookup by config *INDEX* */ | |
442 | w_value &= 0xff; | |
443 | list_for_each_entry(c, &cdev->configs, list) { | |
444 | /* ignore configs that won't work at this speed */ | |
bdb64d72 TB |
445 | switch (speed) { |
446 | case USB_SPEED_SUPER: | |
447 | if (!c->superspeed) | |
448 | continue; | |
449 | break; | |
450 | case USB_SPEED_HIGH: | |
40982be5 DB |
451 | if (!c->highspeed) |
452 | continue; | |
bdb64d72 TB |
453 | break; |
454 | default: | |
40982be5 DB |
455 | if (!c->fullspeed) |
456 | continue; | |
457 | } | |
bdb64d72 | 458 | |
40982be5 DB |
459 | if (w_value == 0) |
460 | return config_buf(c, speed, cdev->req->buf, type); | |
461 | w_value--; | |
462 | } | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | static int count_configs(struct usb_composite_dev *cdev, unsigned type) | |
467 | { | |
468 | struct usb_gadget *gadget = cdev->gadget; | |
469 | struct usb_configuration *c; | |
470 | unsigned count = 0; | |
471 | int hs = 0; | |
bdb64d72 | 472 | int ss = 0; |
40982be5 DB |
473 | |
474 | if (gadget_is_dualspeed(gadget)) { | |
475 | if (gadget->speed == USB_SPEED_HIGH) | |
476 | hs = 1; | |
bdb64d72 TB |
477 | if (gadget->speed == USB_SPEED_SUPER) |
478 | ss = 1; | |
40982be5 DB |
479 | if (type == USB_DT_DEVICE_QUALIFIER) |
480 | hs = !hs; | |
481 | } | |
482 | list_for_each_entry(c, &cdev->configs, list) { | |
483 | /* ignore configs that won't work at this speed */ | |
bdb64d72 TB |
484 | if (ss) { |
485 | if (!c->superspeed) | |
486 | continue; | |
487 | } else if (hs) { | |
40982be5 DB |
488 | if (!c->highspeed) |
489 | continue; | |
490 | } else { | |
491 | if (!c->fullspeed) | |
492 | continue; | |
493 | } | |
494 | count++; | |
495 | } | |
496 | return count; | |
497 | } | |
498 | ||
bdb64d72 TB |
499 | /** |
500 | * bos_desc() - prepares the BOS descriptor. | |
501 | * @cdev: pointer to usb_composite device to generate the bos | |
502 | * descriptor for | |
503 | * | |
504 | * This function generates the BOS (Binary Device Object) | |
505 | * descriptor and its device capabilities descriptors. The BOS | |
506 | * descriptor should be supported by a SuperSpeed device. | |
507 | */ | |
508 | static int bos_desc(struct usb_composite_dev *cdev) | |
509 | { | |
510 | struct usb_ext_cap_descriptor *usb_ext; | |
511 | struct usb_ss_cap_descriptor *ss_cap; | |
512 | struct usb_dcd_config_params dcd_config_params; | |
513 | struct usb_bos_descriptor *bos = cdev->req->buf; | |
514 | ||
515 | bos->bLength = USB_DT_BOS_SIZE; | |
516 | bos->bDescriptorType = USB_DT_BOS; | |
517 | ||
518 | bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE); | |
519 | bos->bNumDeviceCaps = 0; | |
520 | ||
521 | /* | |
522 | * A SuperSpeed device shall include the USB2.0 extension descriptor | |
523 | * and shall support LPM when operating in USB2.0 HS mode. | |
524 | */ | |
525 | usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength); | |
526 | bos->bNumDeviceCaps++; | |
527 | le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE); | |
528 | usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE; | |
529 | usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY; | |
530 | usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT; | |
531 | usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT); | |
532 | ||
533 | /* | |
534 | * The Superspeed USB Capability descriptor shall be implemented by all | |
535 | * SuperSpeed devices. | |
536 | */ | |
537 | ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength); | |
538 | bos->bNumDeviceCaps++; | |
539 | le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE); | |
540 | ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE; | |
541 | ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY; | |
542 | ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE; | |
543 | ss_cap->bmAttributes = 0; /* LTM is not supported yet */ | |
544 | ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION | | |
545 | USB_FULL_SPEED_OPERATION | | |
546 | USB_HIGH_SPEED_OPERATION | | |
547 | USB_5GBPS_OPERATION); | |
548 | ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION; | |
549 | ||
550 | /* Get Controller configuration */ | |
551 | if (cdev->gadget->ops->get_config_params) | |
552 | cdev->gadget->ops->get_config_params(&dcd_config_params); | |
553 | else { | |
554 | dcd_config_params.bU1devExitLat = USB_DEFULT_U1_DEV_EXIT_LAT; | |
555 | dcd_config_params.bU2DevExitLat = | |
556 | cpu_to_le16(USB_DEFULT_U2_DEV_EXIT_LAT); | |
557 | } | |
558 | ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat; | |
559 | ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat; | |
560 | ||
561 | return le16_to_cpu(bos->wTotalLength); | |
562 | } | |
563 | ||
40982be5 DB |
564 | static void device_qual(struct usb_composite_dev *cdev) |
565 | { | |
566 | struct usb_qualifier_descriptor *qual = cdev->req->buf; | |
567 | ||
568 | qual->bLength = sizeof(*qual); | |
569 | qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER; | |
570 | /* POLICY: same bcdUSB and device type info at both speeds */ | |
571 | qual->bcdUSB = cdev->desc.bcdUSB; | |
572 | qual->bDeviceClass = cdev->desc.bDeviceClass; | |
573 | qual->bDeviceSubClass = cdev->desc.bDeviceSubClass; | |
574 | qual->bDeviceProtocol = cdev->desc.bDeviceProtocol; | |
575 | /* ASSUME same EP0 fifo size at both speeds */ | |
576 | qual->bMaxPacketSize0 = cdev->desc.bMaxPacketSize0; | |
577 | qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER); | |
c24f4227 | 578 | qual->bRESERVED = 0; |
40982be5 DB |
579 | } |
580 | ||
581 | /*-------------------------------------------------------------------------*/ | |
582 | ||
583 | static void reset_config(struct usb_composite_dev *cdev) | |
584 | { | |
585 | struct usb_function *f; | |
586 | ||
587 | DBG(cdev, "reset config\n"); | |
588 | ||
589 | list_for_each_entry(f, &cdev->config->functions, list) { | |
590 | if (f->disable) | |
591 | f->disable(f); | |
5242658d LP |
592 | |
593 | bitmap_zero(f->endpoints, 32); | |
40982be5 DB |
594 | } |
595 | cdev->config = NULL; | |
596 | } | |
597 | ||
598 | static int set_config(struct usb_composite_dev *cdev, | |
599 | const struct usb_ctrlrequest *ctrl, unsigned number) | |
600 | { | |
601 | struct usb_gadget *gadget = cdev->gadget; | |
602 | struct usb_configuration *c = NULL; | |
603 | int result = -EINVAL; | |
604 | unsigned power = gadget_is_otg(gadget) ? 8 : 100; | |
605 | int tmp; | |
606 | ||
40982be5 DB |
607 | if (number) { |
608 | list_for_each_entry(c, &cdev->configs, list) { | |
609 | if (c->bConfigurationValue == number) { | |
bdb64d72 TB |
610 | /* |
611 | * We disable the FDs of the previous | |
612 | * configuration only if the new configuration | |
613 | * is a valid one | |
614 | */ | |
615 | if (cdev->config) | |
616 | reset_config(cdev); | |
40982be5 DB |
617 | result = 0; |
618 | break; | |
619 | } | |
620 | } | |
621 | if (result < 0) | |
622 | goto done; | |
bdb64d72 TB |
623 | } else { /* Zero configuration value - need to reset the config */ |
624 | if (cdev->config) | |
625 | reset_config(cdev); | |
40982be5 | 626 | result = 0; |
bdb64d72 | 627 | } |
40982be5 DB |
628 | |
629 | INFO(cdev, "%s speed config #%d: %s\n", | |
630 | ({ char *speed; | |
631 | switch (gadget->speed) { | |
7c884fe4 TB |
632 | case USB_SPEED_LOW: |
633 | speed = "low"; | |
634 | break; | |
635 | case USB_SPEED_FULL: | |
636 | speed = "full"; | |
637 | break; | |
638 | case USB_SPEED_HIGH: | |
639 | speed = "high"; | |
640 | break; | |
bdb64d72 TB |
641 | case USB_SPEED_SUPER: |
642 | speed = "super"; | |
643 | break; | |
7c884fe4 TB |
644 | default: |
645 | speed = "?"; | |
646 | break; | |
40982be5 DB |
647 | } ; speed; }), number, c ? c->label : "unconfigured"); |
648 | ||
649 | if (!c) | |
650 | goto done; | |
651 | ||
652 | cdev->config = c; | |
653 | ||
654 | /* Initialize all interfaces by setting them to altsetting zero. */ | |
655 | for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) { | |
656 | struct usb_function *f = c->interface[tmp]; | |
5242658d | 657 | struct usb_descriptor_header **descriptors; |
40982be5 DB |
658 | |
659 | if (!f) | |
660 | break; | |
661 | ||
5242658d LP |
662 | /* |
663 | * Record which endpoints are used by the function. This is used | |
664 | * to dispatch control requests targeted at that endpoint to the | |
665 | * function's setup callback instead of the current | |
666 | * configuration's setup callback. | |
667 | */ | |
bdb64d72 TB |
668 | switch (gadget->speed) { |
669 | case USB_SPEED_SUPER: | |
670 | descriptors = f->ss_descriptors; | |
671 | break; | |
672 | case USB_SPEED_HIGH: | |
5242658d | 673 | descriptors = f->hs_descriptors; |
bdb64d72 TB |
674 | break; |
675 | default: | |
5242658d | 676 | descriptors = f->descriptors; |
bdb64d72 | 677 | } |
5242658d LP |
678 | |
679 | for (; *descriptors; ++descriptors) { | |
680 | struct usb_endpoint_descriptor *ep; | |
681 | int addr; | |
682 | ||
683 | if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT) | |
684 | continue; | |
685 | ||
686 | ep = (struct usb_endpoint_descriptor *)*descriptors; | |
687 | addr = ((ep->bEndpointAddress & 0x80) >> 3) | |
688 | | (ep->bEndpointAddress & 0x0f); | |
689 | set_bit(addr, f->endpoints); | |
690 | } | |
691 | ||
40982be5 DB |
692 | result = f->set_alt(f, tmp, 0); |
693 | if (result < 0) { | |
694 | DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n", | |
695 | tmp, f->name, f, result); | |
696 | ||
697 | reset_config(cdev); | |
698 | goto done; | |
699 | } | |
1b9ba000 RQ |
700 | |
701 | if (result == USB_GADGET_DELAYED_STATUS) { | |
702 | DBG(cdev, | |
703 | "%s: interface %d (%s) requested delayed status\n", | |
704 | __func__, tmp, f->name); | |
705 | cdev->delayed_status++; | |
706 | DBG(cdev, "delayed_status count %d\n", | |
707 | cdev->delayed_status); | |
708 | } | |
40982be5 DB |
709 | } |
710 | ||
711 | /* when we return, be sure our power usage is valid */ | |
36e893d2 | 712 | power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW; |
40982be5 DB |
713 | done: |
714 | usb_gadget_vbus_draw(gadget, power); | |
1b9ba000 RQ |
715 | if (result >= 0 && cdev->delayed_status) |
716 | result = USB_GADGET_DELAYED_STATUS; | |
40982be5 DB |
717 | return result; |
718 | } | |
719 | ||
720 | /** | |
721 | * usb_add_config() - add a configuration to a device. | |
722 | * @cdev: wraps the USB gadget | |
723 | * @config: the configuration, with bConfigurationValue assigned | |
c9bfff9c | 724 | * @bind: the configuration's bind function |
40982be5 DB |
725 | * Context: single threaded during gadget setup |
726 | * | |
c9bfff9c | 727 | * One of the main tasks of a composite @bind() routine is to |
40982be5 DB |
728 | * add each of the configurations it supports, using this routine. |
729 | * | |
c9bfff9c | 730 | * This function returns the value of the configuration's @bind(), which |
40982be5 DB |
731 | * is zero for success else a negative errno value. Binding configurations |
732 | * assigns global resources including string IDs, and per-configuration | |
733 | * resources such as interface IDs and endpoints. | |
734 | */ | |
28824b18 | 735 | int usb_add_config(struct usb_composite_dev *cdev, |
c9bfff9c UKK |
736 | struct usb_configuration *config, |
737 | int (*bind)(struct usb_configuration *)) | |
40982be5 DB |
738 | { |
739 | int status = -EINVAL; | |
740 | struct usb_configuration *c; | |
741 | ||
742 | DBG(cdev, "adding config #%u '%s'/%p\n", | |
743 | config->bConfigurationValue, | |
744 | config->label, config); | |
745 | ||
c9bfff9c | 746 | if (!config->bConfigurationValue || !bind) |
40982be5 DB |
747 | goto done; |
748 | ||
749 | /* Prevent duplicate configuration identifiers */ | |
750 | list_for_each_entry(c, &cdev->configs, list) { | |
751 | if (c->bConfigurationValue == config->bConfigurationValue) { | |
752 | status = -EBUSY; | |
753 | goto done; | |
754 | } | |
755 | } | |
756 | ||
757 | config->cdev = cdev; | |
758 | list_add_tail(&config->list, &cdev->configs); | |
759 | ||
760 | INIT_LIST_HEAD(&config->functions); | |
761 | config->next_interface_id = 0; | |
762 | ||
c9bfff9c | 763 | status = bind(config); |
40982be5 DB |
764 | if (status < 0) { |
765 | list_del(&config->list); | |
766 | config->cdev = NULL; | |
767 | } else { | |
768 | unsigned i; | |
769 | ||
bdb64d72 | 770 | DBG(cdev, "cfg %d/%p speeds:%s%s%s\n", |
40982be5 | 771 | config->bConfigurationValue, config, |
bdb64d72 | 772 | config->superspeed ? " super" : "", |
40982be5 DB |
773 | config->highspeed ? " high" : "", |
774 | config->fullspeed | |
775 | ? (gadget_is_dualspeed(cdev->gadget) | |
776 | ? " full" | |
777 | : " full/low") | |
778 | : ""); | |
779 | ||
780 | for (i = 0; i < MAX_CONFIG_INTERFACES; i++) { | |
781 | struct usb_function *f = config->interface[i]; | |
782 | ||
783 | if (!f) | |
784 | continue; | |
785 | DBG(cdev, " interface %d = %s/%p\n", | |
786 | i, f->name, f); | |
787 | } | |
788 | } | |
789 | ||
c9bfff9c | 790 | /* set_alt(), or next bind(), sets up |
40982be5 DB |
791 | * ep->driver_data as needed. |
792 | */ | |
793 | usb_ep_autoconfig_reset(cdev->gadget); | |
794 | ||
795 | done: | |
796 | if (status) | |
797 | DBG(cdev, "added config '%s'/%u --> %d\n", config->label, | |
798 | config->bConfigurationValue, status); | |
799 | return status; | |
800 | } | |
801 | ||
802 | /*-------------------------------------------------------------------------*/ | |
803 | ||
804 | /* We support strings in multiple languages ... string descriptor zero | |
805 | * says which languages are supported. The typical case will be that | |
806 | * only one language (probably English) is used, with I18N handled on | |
807 | * the host side. | |
808 | */ | |
809 | ||
810 | static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf) | |
811 | { | |
812 | const struct usb_gadget_strings *s; | |
813 | u16 language; | |
814 | __le16 *tmp; | |
815 | ||
816 | while (*sp) { | |
817 | s = *sp; | |
818 | language = cpu_to_le16(s->language); | |
819 | for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) { | |
820 | if (*tmp == language) | |
821 | goto repeat; | |
822 | } | |
823 | *tmp++ = language; | |
824 | repeat: | |
825 | sp++; | |
826 | } | |
827 | } | |
828 | ||
829 | static int lookup_string( | |
830 | struct usb_gadget_strings **sp, | |
831 | void *buf, | |
832 | u16 language, | |
833 | int id | |
834 | ) | |
835 | { | |
836 | struct usb_gadget_strings *s; | |
837 | int value; | |
838 | ||
839 | while (*sp) { | |
840 | s = *sp++; | |
841 | if (s->language != language) | |
842 | continue; | |
843 | value = usb_gadget_get_string(s, id, buf); | |
844 | if (value > 0) | |
845 | return value; | |
846 | } | |
847 | return -EINVAL; | |
848 | } | |
849 | ||
850 | static int get_string(struct usb_composite_dev *cdev, | |
851 | void *buf, u16 language, int id) | |
852 | { | |
853 | struct usb_configuration *c; | |
854 | struct usb_function *f; | |
855 | int len; | |
ad1a8102 | 856 | const char *str; |
40982be5 DB |
857 | |
858 | /* Yes, not only is USB's I18N support probably more than most | |
859 | * folk will ever care about ... also, it's all supported here. | |
860 | * (Except for UTF8 support for Unicode's "Astral Planes".) | |
861 | */ | |
862 | ||
863 | /* 0 == report all available language codes */ | |
864 | if (id == 0) { | |
865 | struct usb_string_descriptor *s = buf; | |
866 | struct usb_gadget_strings **sp; | |
867 | ||
868 | memset(s, 0, 256); | |
869 | s->bDescriptorType = USB_DT_STRING; | |
870 | ||
871 | sp = composite->strings; | |
872 | if (sp) | |
873 | collect_langs(sp, s->wData); | |
874 | ||
875 | list_for_each_entry(c, &cdev->configs, list) { | |
876 | sp = c->strings; | |
877 | if (sp) | |
878 | collect_langs(sp, s->wData); | |
879 | ||
880 | list_for_each_entry(f, &c->functions, list) { | |
881 | sp = f->strings; | |
882 | if (sp) | |
883 | collect_langs(sp, s->wData); | |
884 | } | |
885 | } | |
886 | ||
417b57b3 | 887 | for (len = 0; len <= 126 && s->wData[len]; len++) |
40982be5 DB |
888 | continue; |
889 | if (!len) | |
890 | return -EINVAL; | |
891 | ||
892 | s->bLength = 2 * (len + 1); | |
893 | return s->bLength; | |
894 | } | |
895 | ||
ad1a8102 MN |
896 | /* Otherwise, look up and return a specified string. First |
897 | * check if the string has not been overridden. | |
898 | */ | |
899 | if (cdev->manufacturer_override == id) | |
900 | str = iManufacturer ?: composite->iManufacturer ?: | |
901 | composite_manufacturer; | |
902 | else if (cdev->product_override == id) | |
903 | str = iProduct ?: composite->iProduct; | |
904 | else if (cdev->serial_override == id) | |
905 | str = iSerialNumber; | |
906 | else | |
907 | str = NULL; | |
908 | if (str) { | |
909 | struct usb_gadget_strings strings = { | |
910 | .language = language, | |
911 | .strings = &(struct usb_string) { 0xff, str } | |
912 | }; | |
913 | return usb_gadget_get_string(&strings, 0xff, buf); | |
914 | } | |
915 | ||
916 | /* String IDs are device-scoped, so we look up each string | |
917 | * table we're told about. These lookups are infrequent; | |
918 | * simpler-is-better here. | |
40982be5 DB |
919 | */ |
920 | if (composite->strings) { | |
921 | len = lookup_string(composite->strings, buf, language, id); | |
922 | if (len > 0) | |
923 | return len; | |
924 | } | |
925 | list_for_each_entry(c, &cdev->configs, list) { | |
926 | if (c->strings) { | |
927 | len = lookup_string(c->strings, buf, language, id); | |
928 | if (len > 0) | |
929 | return len; | |
930 | } | |
931 | list_for_each_entry(f, &c->functions, list) { | |
932 | if (!f->strings) | |
933 | continue; | |
934 | len = lookup_string(f->strings, buf, language, id); | |
935 | if (len > 0) | |
936 | return len; | |
937 | } | |
938 | } | |
939 | return -EINVAL; | |
940 | } | |
941 | ||
942 | /** | |
943 | * usb_string_id() - allocate an unused string ID | |
944 | * @cdev: the device whose string descriptor IDs are being allocated | |
945 | * Context: single threaded during gadget setup | |
946 | * | |
947 | * @usb_string_id() is called from bind() callbacks to allocate | |
948 | * string IDs. Drivers for functions, configurations, or gadgets will | |
949 | * then store that ID in the appropriate descriptors and string table. | |
950 | * | |
f2adc4f8 MN |
951 | * All string identifier should be allocated using this, |
952 | * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure | |
953 | * that for example different functions don't wrongly assign different | |
954 | * meanings to the same identifier. | |
40982be5 | 955 | */ |
28824b18 | 956 | int usb_string_id(struct usb_composite_dev *cdev) |
40982be5 DB |
957 | { |
958 | if (cdev->next_string_id < 254) { | |
f2adc4f8 MN |
959 | /* string id 0 is reserved by USB spec for list of |
960 | * supported languages */ | |
961 | /* 255 reserved as well? -- mina86 */ | |
40982be5 DB |
962 | cdev->next_string_id++; |
963 | return cdev->next_string_id; | |
964 | } | |
965 | return -ENODEV; | |
966 | } | |
967 | ||
f2adc4f8 MN |
968 | /** |
969 | * usb_string_ids() - allocate unused string IDs in batch | |
970 | * @cdev: the device whose string descriptor IDs are being allocated | |
971 | * @str: an array of usb_string objects to assign numbers to | |
972 | * Context: single threaded during gadget setup | |
973 | * | |
974 | * @usb_string_ids() is called from bind() callbacks to allocate | |
975 | * string IDs. Drivers for functions, configurations, or gadgets will | |
976 | * then copy IDs from the string table to the appropriate descriptors | |
977 | * and string table for other languages. | |
978 | * | |
979 | * All string identifier should be allocated using this, | |
980 | * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for | |
981 | * example different functions don't wrongly assign different meanings | |
982 | * to the same identifier. | |
983 | */ | |
984 | int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str) | |
985 | { | |
986 | int next = cdev->next_string_id; | |
987 | ||
988 | for (; str->s; ++str) { | |
989 | if (unlikely(next >= 254)) | |
990 | return -ENODEV; | |
991 | str->id = ++next; | |
992 | } | |
993 | ||
994 | cdev->next_string_id = next; | |
995 | ||
996 | return 0; | |
997 | } | |
998 | ||
999 | /** | |
1000 | * usb_string_ids_n() - allocate unused string IDs in batch | |
d187abb9 | 1001 | * @c: the device whose string descriptor IDs are being allocated |
f2adc4f8 MN |
1002 | * @n: number of string IDs to allocate |
1003 | * Context: single threaded during gadget setup | |
1004 | * | |
1005 | * Returns the first requested ID. This ID and next @n-1 IDs are now | |
d187abb9 | 1006 | * valid IDs. At least provided that @n is non-zero because if it |
f2adc4f8 MN |
1007 | * is, returns last requested ID which is now very useful information. |
1008 | * | |
1009 | * @usb_string_ids_n() is called from bind() callbacks to allocate | |
1010 | * string IDs. Drivers for functions, configurations, or gadgets will | |
1011 | * then store that ID in the appropriate descriptors and string table. | |
1012 | * | |
1013 | * All string identifier should be allocated using this, | |
1014 | * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for | |
1015 | * example different functions don't wrongly assign different meanings | |
1016 | * to the same identifier. | |
1017 | */ | |
1018 | int usb_string_ids_n(struct usb_composite_dev *c, unsigned n) | |
1019 | { | |
1020 | unsigned next = c->next_string_id; | |
1021 | if (unlikely(n > 254 || (unsigned)next + n > 254)) | |
1022 | return -ENODEV; | |
1023 | c->next_string_id += n; | |
1024 | return next + 1; | |
1025 | } | |
1026 | ||
1027 | ||
40982be5 DB |
1028 | /*-------------------------------------------------------------------------*/ |
1029 | ||
1030 | static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req) | |
1031 | { | |
1032 | if (req->status || req->actual != req->length) | |
1033 | DBG((struct usb_composite_dev *) ep->driver_data, | |
1034 | "setup complete --> %d, %d/%d\n", | |
1035 | req->status, req->actual, req->length); | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * The setup() callback implements all the ep0 functionality that's | |
1040 | * not handled lower down, in hardware or the hardware driver(like | |
1041 | * device and endpoint feature flags, and their status). It's all | |
1042 | * housekeeping for the gadget function we're implementing. Most of | |
1043 | * the work is in config and function specific setup. | |
1044 | */ | |
1045 | static int | |
1046 | composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) | |
1047 | { | |
1048 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1049 | struct usb_request *req = cdev->req; | |
1050 | int value = -EOPNOTSUPP; | |
bdb64d72 | 1051 | int status = 0; |
40982be5 | 1052 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
08889517 | 1053 | u8 intf = w_index & 0xFF; |
40982be5 DB |
1054 | u16 w_value = le16_to_cpu(ctrl->wValue); |
1055 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
1056 | struct usb_function *f = NULL; | |
5242658d | 1057 | u8 endp; |
40982be5 DB |
1058 | |
1059 | /* partial re-init of the response message; the function or the | |
1060 | * gadget might need to intercept e.g. a control-OUT completion | |
1061 | * when we delegate to it. | |
1062 | */ | |
1063 | req->zero = 0; | |
1064 | req->complete = composite_setup_complete; | |
2edb11cb | 1065 | req->length = 0; |
40982be5 DB |
1066 | gadget->ep0->driver_data = cdev; |
1067 | ||
1068 | switch (ctrl->bRequest) { | |
1069 | ||
1070 | /* we handle all standard USB descriptors */ | |
1071 | case USB_REQ_GET_DESCRIPTOR: | |
1072 | if (ctrl->bRequestType != USB_DIR_IN) | |
1073 | goto unknown; | |
1074 | switch (w_value >> 8) { | |
1075 | ||
1076 | case USB_DT_DEVICE: | |
1077 | cdev->desc.bNumConfigurations = | |
1078 | count_configs(cdev, USB_DT_DEVICE); | |
bdb64d72 TB |
1079 | cdev->desc.bMaxPacketSize0 = |
1080 | cdev->gadget->ep0->maxpacket; | |
1081 | if (gadget_is_superspeed(gadget)) { | |
1082 | if (gadget->speed >= USB_SPEED_SUPER) | |
1083 | cdev->desc.bcdUSB = cpu_to_le16(0x0300); | |
1084 | else | |
1085 | cdev->desc.bcdUSB = cpu_to_le16(0x0210); | |
1086 | } | |
1087 | ||
40982be5 DB |
1088 | value = min(w_length, (u16) sizeof cdev->desc); |
1089 | memcpy(req->buf, &cdev->desc, value); | |
1090 | break; | |
1091 | case USB_DT_DEVICE_QUALIFIER: | |
bdb64d72 TB |
1092 | if (!gadget_is_dualspeed(gadget) || |
1093 | gadget->speed >= USB_SPEED_SUPER) | |
40982be5 DB |
1094 | break; |
1095 | device_qual(cdev); | |
1096 | value = min_t(int, w_length, | |
1097 | sizeof(struct usb_qualifier_descriptor)); | |
1098 | break; | |
1099 | case USB_DT_OTHER_SPEED_CONFIG: | |
bdb64d72 TB |
1100 | if (!gadget_is_dualspeed(gadget) || |
1101 | gadget->speed >= USB_SPEED_SUPER) | |
40982be5 DB |
1102 | break; |
1103 | /* FALLTHROUGH */ | |
1104 | case USB_DT_CONFIG: | |
1105 | value = config_desc(cdev, w_value); | |
1106 | if (value >= 0) | |
1107 | value = min(w_length, (u16) value); | |
1108 | break; | |
1109 | case USB_DT_STRING: | |
1110 | value = get_string(cdev, req->buf, | |
1111 | w_index, w_value & 0xff); | |
1112 | if (value >= 0) | |
1113 | value = min(w_length, (u16) value); | |
1114 | break; | |
bdb64d72 TB |
1115 | case USB_DT_BOS: |
1116 | if (gadget_is_superspeed(gadget)) { | |
1117 | value = bos_desc(cdev); | |
1118 | value = min(w_length, (u16) value); | |
1119 | } | |
1120 | break; | |
40982be5 DB |
1121 | } |
1122 | break; | |
1123 | ||
1124 | /* any number of configs can work */ | |
1125 | case USB_REQ_SET_CONFIGURATION: | |
1126 | if (ctrl->bRequestType != 0) | |
1127 | goto unknown; | |
1128 | if (gadget_is_otg(gadget)) { | |
1129 | if (gadget->a_hnp_support) | |
1130 | DBG(cdev, "HNP available\n"); | |
1131 | else if (gadget->a_alt_hnp_support) | |
1132 | DBG(cdev, "HNP on another port\n"); | |
1133 | else | |
1134 | VDBG(cdev, "HNP inactive\n"); | |
1135 | } | |
1136 | spin_lock(&cdev->lock); | |
1137 | value = set_config(cdev, ctrl, w_value); | |
1138 | spin_unlock(&cdev->lock); | |
1139 | break; | |
1140 | case USB_REQ_GET_CONFIGURATION: | |
1141 | if (ctrl->bRequestType != USB_DIR_IN) | |
1142 | goto unknown; | |
1143 | if (cdev->config) | |
1144 | *(u8 *)req->buf = cdev->config->bConfigurationValue; | |
1145 | else | |
1146 | *(u8 *)req->buf = 0; | |
1147 | value = min(w_length, (u16) 1); | |
1148 | break; | |
1149 | ||
1150 | /* function drivers must handle get/set altsetting; if there's | |
1151 | * no get() method, we know only altsetting zero works. | |
1152 | */ | |
1153 | case USB_REQ_SET_INTERFACE: | |
1154 | if (ctrl->bRequestType != USB_RECIP_INTERFACE) | |
1155 | goto unknown; | |
ff085de7 | 1156 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) |
40982be5 | 1157 | break; |
08889517 | 1158 | f = cdev->config->interface[intf]; |
40982be5 DB |
1159 | if (!f) |
1160 | break; | |
dd4dff8b | 1161 | if (w_value && !f->set_alt) |
40982be5 DB |
1162 | break; |
1163 | value = f->set_alt(f, w_index, w_value); | |
1b9ba000 RQ |
1164 | if (value == USB_GADGET_DELAYED_STATUS) { |
1165 | DBG(cdev, | |
1166 | "%s: interface %d (%s) requested delayed status\n", | |
1167 | __func__, intf, f->name); | |
1168 | cdev->delayed_status++; | |
1169 | DBG(cdev, "delayed_status count %d\n", | |
1170 | cdev->delayed_status); | |
1171 | } | |
40982be5 DB |
1172 | break; |
1173 | case USB_REQ_GET_INTERFACE: | |
1174 | if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) | |
1175 | goto unknown; | |
ff085de7 | 1176 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) |
40982be5 | 1177 | break; |
08889517 | 1178 | f = cdev->config->interface[intf]; |
40982be5 DB |
1179 | if (!f) |
1180 | break; | |
1181 | /* lots of interfaces only need altsetting zero... */ | |
1182 | value = f->get_alt ? f->get_alt(f, w_index) : 0; | |
1183 | if (value < 0) | |
1184 | break; | |
1185 | *((u8 *)req->buf) = value; | |
1186 | value = min(w_length, (u16) 1); | |
1187 | break; | |
bdb64d72 TB |
1188 | |
1189 | /* | |
1190 | * USB 3.0 additions: | |
1191 | * Function driver should handle get_status request. If such cb | |
1192 | * wasn't supplied we respond with default value = 0 | |
1193 | * Note: function driver should supply such cb only for the first | |
1194 | * interface of the function | |
1195 | */ | |
1196 | case USB_REQ_GET_STATUS: | |
1197 | if (!gadget_is_superspeed(gadget)) | |
1198 | goto unknown; | |
1199 | if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE)) | |
1200 | goto unknown; | |
1201 | value = 2; /* This is the length of the get_status reply */ | |
1202 | put_unaligned_le16(0, req->buf); | |
1203 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) | |
1204 | break; | |
1205 | f = cdev->config->interface[intf]; | |
1206 | if (!f) | |
1207 | break; | |
1208 | status = f->get_status ? f->get_status(f) : 0; | |
1209 | if (status < 0) | |
1210 | break; | |
1211 | put_unaligned_le16(status & 0x0000ffff, req->buf); | |
1212 | break; | |
1213 | /* | |
1214 | * Function drivers should handle SetFeature/ClearFeature | |
1215 | * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied | |
1216 | * only for the first interface of the function | |
1217 | */ | |
1218 | case USB_REQ_CLEAR_FEATURE: | |
1219 | case USB_REQ_SET_FEATURE: | |
1220 | if (!gadget_is_superspeed(gadget)) | |
1221 | goto unknown; | |
1222 | if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE)) | |
1223 | goto unknown; | |
1224 | switch (w_value) { | |
1225 | case USB_INTRF_FUNC_SUSPEND: | |
1226 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) | |
1227 | break; | |
1228 | f = cdev->config->interface[intf]; | |
1229 | if (!f) | |
1230 | break; | |
1231 | value = 0; | |
1232 | if (f->func_suspend) | |
1233 | value = f->func_suspend(f, w_index >> 8); | |
1234 | if (value < 0) { | |
1235 | ERROR(cdev, | |
1236 | "func_suspend() returned error %d\n", | |
1237 | value); | |
1238 | value = 0; | |
1239 | } | |
1240 | break; | |
1241 | } | |
1242 | break; | |
40982be5 DB |
1243 | default: |
1244 | unknown: | |
1245 | VDBG(cdev, | |
1246 | "non-core control req%02x.%02x v%04x i%04x l%d\n", | |
1247 | ctrl->bRequestType, ctrl->bRequest, | |
1248 | w_value, w_index, w_length); | |
1249 | ||
5242658d LP |
1250 | /* functions always handle their interfaces and endpoints... |
1251 | * punt other recipients (other, WUSB, ...) to the current | |
40982be5 DB |
1252 | * configuration code. |
1253 | * | |
1254 | * REVISIT it could make sense to let the composite device | |
1255 | * take such requests too, if that's ever needed: to work | |
1256 | * in config 0, etc. | |
1257 | */ | |
5242658d LP |
1258 | switch (ctrl->bRequestType & USB_RECIP_MASK) { |
1259 | case USB_RECIP_INTERFACE: | |
ff085de7 | 1260 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) |
3c47eb06 MM |
1261 | break; |
1262 | f = cdev->config->interface[intf]; | |
5242658d LP |
1263 | break; |
1264 | ||
1265 | case USB_RECIP_ENDPOINT: | |
1266 | endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f); | |
1267 | list_for_each_entry(f, &cdev->config->functions, list) { | |
1268 | if (test_bit(endp, f->endpoints)) | |
1269 | break; | |
1270 | } | |
1271 | if (&f->list == &cdev->config->functions) | |
40982be5 | 1272 | f = NULL; |
5242658d | 1273 | break; |
40982be5 | 1274 | } |
5242658d LP |
1275 | |
1276 | if (f && f->setup) | |
1277 | value = f->setup(f, ctrl); | |
1278 | else { | |
40982be5 DB |
1279 | struct usb_configuration *c; |
1280 | ||
1281 | c = cdev->config; | |
1282 | if (c && c->setup) | |
1283 | value = c->setup(c, ctrl); | |
1284 | } | |
1285 | ||
1286 | goto done; | |
1287 | } | |
1288 | ||
1289 | /* respond with data transfer before status phase? */ | |
1b9ba000 | 1290 | if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) { |
40982be5 DB |
1291 | req->length = value; |
1292 | req->zero = value < w_length; | |
1293 | value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); | |
1294 | if (value < 0) { | |
1295 | DBG(cdev, "ep_queue --> %d\n", value); | |
1296 | req->status = 0; | |
1297 | composite_setup_complete(gadget->ep0, req); | |
1298 | } | |
1b9ba000 RQ |
1299 | } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) { |
1300 | WARN(cdev, | |
1301 | "%s: Delayed status not supported for w_length != 0", | |
1302 | __func__); | |
40982be5 DB |
1303 | } |
1304 | ||
1305 | done: | |
1306 | /* device either stalls (value < 0) or reports success */ | |
1307 | return value; | |
1308 | } | |
1309 | ||
1310 | static void composite_disconnect(struct usb_gadget *gadget) | |
1311 | { | |
1312 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1313 | unsigned long flags; | |
1314 | ||
1315 | /* REVISIT: should we have config and device level | |
1316 | * disconnect callbacks? | |
1317 | */ | |
1318 | spin_lock_irqsave(&cdev->lock, flags); | |
1319 | if (cdev->config) | |
1320 | reset_config(cdev); | |
3f3e12d0 MN |
1321 | if (composite->disconnect) |
1322 | composite->disconnect(cdev); | |
40982be5 DB |
1323 | spin_unlock_irqrestore(&cdev->lock, flags); |
1324 | } | |
1325 | ||
1326 | /*-------------------------------------------------------------------------*/ | |
1327 | ||
f48cf80f FC |
1328 | static ssize_t composite_show_suspended(struct device *dev, |
1329 | struct device_attribute *attr, | |
1330 | char *buf) | |
1331 | { | |
1332 | struct usb_gadget *gadget = dev_to_usb_gadget(dev); | |
1333 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1334 | ||
1335 | return sprintf(buf, "%d\n", cdev->suspended); | |
1336 | } | |
1337 | ||
1338 | static DEVICE_ATTR(suspended, 0444, composite_show_suspended, NULL); | |
1339 | ||
28824b18 | 1340 | static void |
40982be5 DB |
1341 | composite_unbind(struct usb_gadget *gadget) |
1342 | { | |
1343 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1344 | ||
1345 | /* composite_disconnect() must already have been called | |
1346 | * by the underlying peripheral controller driver! | |
1347 | * so there's no i/o concurrency that could affect the | |
1348 | * state protected by cdev->lock. | |
1349 | */ | |
1350 | WARN_ON(cdev->config); | |
1351 | ||
1352 | while (!list_empty(&cdev->configs)) { | |
1353 | struct usb_configuration *c; | |
1354 | ||
1355 | c = list_first_entry(&cdev->configs, | |
1356 | struct usb_configuration, list); | |
1357 | while (!list_empty(&c->functions)) { | |
1358 | struct usb_function *f; | |
1359 | ||
1360 | f = list_first_entry(&c->functions, | |
1361 | struct usb_function, list); | |
1362 | list_del(&f->list); | |
1363 | if (f->unbind) { | |
1364 | DBG(cdev, "unbind function '%s'/%p\n", | |
1365 | f->name, f); | |
1366 | f->unbind(c, f); | |
1367 | /* may free memory for "f" */ | |
1368 | } | |
1369 | } | |
1370 | list_del(&c->list); | |
1371 | if (c->unbind) { | |
1372 | DBG(cdev, "unbind config '%s'/%p\n", c->label, c); | |
1373 | c->unbind(c); | |
1374 | /* may free memory for "c" */ | |
1375 | } | |
1376 | } | |
1377 | if (composite->unbind) | |
1378 | composite->unbind(cdev); | |
1379 | ||
1380 | if (cdev->req) { | |
1381 | kfree(cdev->req->buf); | |
1382 | usb_ep_free_request(gadget->ep0, cdev->req); | |
1383 | } | |
daba5803 | 1384 | device_remove_file(&gadget->dev, &dev_attr_suspended); |
40982be5 DB |
1385 | kfree(cdev); |
1386 | set_gadget_data(gadget, NULL); | |
1387 | composite = NULL; | |
1388 | } | |
1389 | ||
ad1a8102 | 1390 | static u8 override_id(struct usb_composite_dev *cdev, u8 *desc) |
40982be5 | 1391 | { |
ad1a8102 MN |
1392 | if (!*desc) { |
1393 | int ret = usb_string_id(cdev); | |
1394 | if (unlikely(ret < 0)) | |
1395 | WARNING(cdev, "failed to override string ID\n"); | |
1396 | else | |
1397 | *desc = ret; | |
40982be5 | 1398 | } |
40982be5 | 1399 | |
ad1a8102 | 1400 | return *desc; |
40982be5 DB |
1401 | } |
1402 | ||
28824b18 | 1403 | static int composite_bind(struct usb_gadget *gadget) |
40982be5 DB |
1404 | { |
1405 | struct usb_composite_dev *cdev; | |
1406 | int status = -ENOMEM; | |
1407 | ||
1408 | cdev = kzalloc(sizeof *cdev, GFP_KERNEL); | |
1409 | if (!cdev) | |
1410 | return status; | |
1411 | ||
1412 | spin_lock_init(&cdev->lock); | |
1413 | cdev->gadget = gadget; | |
1414 | set_gadget_data(gadget, cdev); | |
1415 | INIT_LIST_HEAD(&cdev->configs); | |
1416 | ||
1417 | /* preallocate control response and buffer */ | |
1418 | cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); | |
1419 | if (!cdev->req) | |
1420 | goto fail; | |
1421 | cdev->req->buf = kmalloc(USB_BUFSIZ, GFP_KERNEL); | |
1422 | if (!cdev->req->buf) | |
1423 | goto fail; | |
1424 | cdev->req->complete = composite_setup_complete; | |
1425 | gadget->ep0->driver_data = cdev; | |
1426 | ||
1427 | cdev->bufsiz = USB_BUFSIZ; | |
1428 | cdev->driver = composite; | |
1429 | ||
37b5801e PM |
1430 | /* |
1431 | * As per USB compliance update, a device that is actively drawing | |
1432 | * more than 100mA from USB must report itself as bus-powered in | |
1433 | * the GetStatus(DEVICE) call. | |
1434 | */ | |
1435 | if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW) | |
1436 | usb_gadget_set_selfpowered(gadget); | |
40982be5 DB |
1437 | |
1438 | /* interface and string IDs start at zero via kzalloc. | |
1439 | * we force endpoints to start unassigned; few controller | |
1440 | * drivers will zero ep->driver_data. | |
1441 | */ | |
1442 | usb_ep_autoconfig_reset(cdev->gadget); | |
1443 | ||
1444 | /* composite gadget needs to assign strings for whole device (like | |
1445 | * serial number), register function drivers, potentially update | |
1446 | * power state and consumption, etc | |
1447 | */ | |
07a18bd7 | 1448 | status = composite_gadget_bind(cdev); |
40982be5 DB |
1449 | if (status < 0) |
1450 | goto fail; | |
1451 | ||
1452 | cdev->desc = *composite->dev; | |
1453 | cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket; | |
1454 | ||
dbb442b8 GKH |
1455 | /* standardized runtime overrides for device ID data */ |
1456 | if (idVendor) | |
1457 | cdev->desc.idVendor = cpu_to_le16(idVendor); | |
1458 | if (idProduct) | |
1459 | cdev->desc.idProduct = cpu_to_le16(idProduct); | |
1460 | if (bcdDevice) | |
1461 | cdev->desc.bcdDevice = cpu_to_le16(bcdDevice); | |
1462 | ||
78bff3c6 | 1463 | /* string overrides */ |
ad1a8102 MN |
1464 | if (iManufacturer || !cdev->desc.iManufacturer) { |
1465 | if (!iManufacturer && !composite->iManufacturer && | |
1466 | !*composite_manufacturer) | |
1467 | snprintf(composite_manufacturer, | |
1468 | sizeof composite_manufacturer, | |
1469 | "%s %s with %s", | |
1470 | init_utsname()->sysname, | |
1471 | init_utsname()->release, | |
1472 | gadget->name); | |
1473 | ||
1474 | cdev->manufacturer_override = | |
1475 | override_id(cdev, &cdev->desc.iManufacturer); | |
1476 | } | |
1477 | ||
1478 | if (iProduct || (!cdev->desc.iProduct && composite->iProduct)) | |
1479 | cdev->product_override = | |
1480 | override_id(cdev, &cdev->desc.iProduct); | |
1481 | ||
1482 | if (iSerialNumber) | |
1483 | cdev->serial_override = | |
1484 | override_id(cdev, &cdev->desc.iSerialNumber); | |
1485 | ||
1486 | /* has userspace failed to provide a serial number? */ | |
1487 | if (composite->needs_serial && !cdev->desc.iSerialNumber) | |
1488 | WARNING(cdev, "userspace failed to provide iSerialNumber\n"); | |
40982be5 | 1489 | |
ad1a8102 | 1490 | /* finish up */ |
f48cf80f FC |
1491 | status = device_create_file(&gadget->dev, &dev_attr_suspended); |
1492 | if (status) | |
1493 | goto fail; | |
1494 | ||
40982be5 DB |
1495 | INFO(cdev, "%s ready\n", composite->name); |
1496 | return 0; | |
1497 | ||
1498 | fail: | |
1499 | composite_unbind(gadget); | |
1500 | return status; | |
1501 | } | |
1502 | ||
1503 | /*-------------------------------------------------------------------------*/ | |
1504 | ||
1505 | static void | |
1506 | composite_suspend(struct usb_gadget *gadget) | |
1507 | { | |
1508 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1509 | struct usb_function *f; | |
1510 | ||
8942939a | 1511 | /* REVISIT: should we have config level |
40982be5 DB |
1512 | * suspend/resume callbacks? |
1513 | */ | |
1514 | DBG(cdev, "suspend\n"); | |
1515 | if (cdev->config) { | |
1516 | list_for_each_entry(f, &cdev->config->functions, list) { | |
1517 | if (f->suspend) | |
1518 | f->suspend(f); | |
1519 | } | |
1520 | } | |
8942939a DB |
1521 | if (composite->suspend) |
1522 | composite->suspend(cdev); | |
f48cf80f FC |
1523 | |
1524 | cdev->suspended = 1; | |
b23f2f94 HW |
1525 | |
1526 | usb_gadget_vbus_draw(gadget, 2); | |
40982be5 DB |
1527 | } |
1528 | ||
1529 | static void | |
1530 | composite_resume(struct usb_gadget *gadget) | |
1531 | { | |
1532 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1533 | struct usb_function *f; | |
b23f2f94 | 1534 | u8 maxpower; |
40982be5 | 1535 | |
8942939a | 1536 | /* REVISIT: should we have config level |
40982be5 DB |
1537 | * suspend/resume callbacks? |
1538 | */ | |
1539 | DBG(cdev, "resume\n"); | |
8942939a DB |
1540 | if (composite->resume) |
1541 | composite->resume(cdev); | |
40982be5 DB |
1542 | if (cdev->config) { |
1543 | list_for_each_entry(f, &cdev->config->functions, list) { | |
1544 | if (f->resume) | |
1545 | f->resume(f); | |
1546 | } | |
b23f2f94 HW |
1547 | |
1548 | maxpower = cdev->config->bMaxPower; | |
1549 | ||
1550 | usb_gadget_vbus_draw(gadget, maxpower ? | |
1551 | (2 * maxpower) : CONFIG_USB_GADGET_VBUS_DRAW); | |
40982be5 | 1552 | } |
f48cf80f FC |
1553 | |
1554 | cdev->suspended = 0; | |
40982be5 DB |
1555 | } |
1556 | ||
1557 | /*-------------------------------------------------------------------------*/ | |
1558 | ||
1559 | static struct usb_gadget_driver composite_driver = { | |
bdb64d72 TB |
1560 | #ifdef CONFIG_USB_GADGET_SUPERSPEED |
1561 | .speed = USB_SPEED_SUPER, | |
1562 | #else | |
40982be5 | 1563 | .speed = USB_SPEED_HIGH, |
bdb64d72 | 1564 | #endif |
40982be5 | 1565 | |
915c8bef | 1566 | .unbind = composite_unbind, |
40982be5 DB |
1567 | |
1568 | .setup = composite_setup, | |
1569 | .disconnect = composite_disconnect, | |
1570 | ||
1571 | .suspend = composite_suspend, | |
1572 | .resume = composite_resume, | |
1573 | ||
1574 | .driver = { | |
1575 | .owner = THIS_MODULE, | |
1576 | }, | |
1577 | }; | |
1578 | ||
1579 | /** | |
07a18bd7 | 1580 | * usb_composite_probe() - register a composite driver |
40982be5 | 1581 | * @driver: the driver to register |
07a18bd7 MN |
1582 | * @bind: the callback used to allocate resources that are shared across the |
1583 | * whole device, such as string IDs, and add its configurations using | |
1584 | * @usb_add_config(). This may fail by returning a negative errno | |
1585 | * value; it should return zero on successful initialization. | |
40982be5 DB |
1586 | * Context: single threaded during gadget setup |
1587 | * | |
1588 | * This function is used to register drivers using the composite driver | |
1589 | * framework. The return value is zero, or a negative errno value. | |
1590 | * Those values normally come from the driver's @bind method, which does | |
1591 | * all the work of setting up the driver to match the hardware. | |
1592 | * | |
1593 | * On successful return, the gadget is ready to respond to requests from | |
1594 | * the host, unless one of its components invokes usb_gadget_disconnect() | |
1595 | * while it was binding. That would usually be done in order to wait for | |
1596 | * some userspace participation. | |
1597 | */ | |
05c3eebd | 1598 | int usb_composite_probe(struct usb_composite_driver *driver, |
07a18bd7 | 1599 | int (*bind)(struct usb_composite_dev *cdev)) |
40982be5 | 1600 | { |
07a18bd7 | 1601 | if (!driver || !driver->dev || !bind || composite) |
40982be5 DB |
1602 | return -EINVAL; |
1603 | ||
1604 | if (!driver->name) | |
1605 | driver->name = "composite"; | |
05c3eebd JB |
1606 | if (!driver->iProduct) |
1607 | driver->iProduct = driver->name; | |
40982be5 DB |
1608 | composite_driver.function = (char *) driver->name; |
1609 | composite_driver.driver.name = driver->name; | |
35a0e0bf TB |
1610 | composite_driver.speed = min((u8)composite_driver.speed, |
1611 | (u8)driver->max_speed); | |
40982be5 | 1612 | composite = driver; |
07a18bd7 | 1613 | composite_gadget_bind = bind; |
40982be5 | 1614 | |
b0fca50f | 1615 | return usb_gadget_probe_driver(&composite_driver, composite_bind); |
40982be5 DB |
1616 | } |
1617 | ||
1618 | /** | |
1619 | * usb_composite_unregister() - unregister a composite driver | |
1620 | * @driver: the driver to unregister | |
1621 | * | |
1622 | * This function is used to unregister drivers using the composite | |
1623 | * driver framework. | |
1624 | */ | |
28824b18 | 1625 | void usb_composite_unregister(struct usb_composite_driver *driver) |
40982be5 DB |
1626 | { |
1627 | if (composite != driver) | |
1628 | return; | |
1629 | usb_gadget_unregister_driver(&composite_driver); | |
1630 | } | |
1b9ba000 RQ |
1631 | |
1632 | /** | |
1633 | * usb_composite_setup_continue() - Continue with the control transfer | |
1634 | * @cdev: the composite device who's control transfer was kept waiting | |
1635 | * | |
1636 | * This function must be called by the USB function driver to continue | |
1637 | * with the control transfer's data/status stage in case it had requested to | |
1638 | * delay the data/status stages. A USB function's setup handler (e.g. set_alt()) | |
1639 | * can request the composite framework to delay the setup request's data/status | |
1640 | * stages by returning USB_GADGET_DELAYED_STATUS. | |
1641 | */ | |
1642 | void usb_composite_setup_continue(struct usb_composite_dev *cdev) | |
1643 | { | |
1644 | int value; | |
1645 | struct usb_request *req = cdev->req; | |
1646 | unsigned long flags; | |
1647 | ||
1648 | DBG(cdev, "%s\n", __func__); | |
1649 | spin_lock_irqsave(&cdev->lock, flags); | |
1650 | ||
1651 | if (cdev->delayed_status == 0) { | |
1652 | WARN(cdev, "%s: Unexpected call\n", __func__); | |
1653 | ||
1654 | } else if (--cdev->delayed_status == 0) { | |
1655 | DBG(cdev, "%s: Completing delayed status\n", __func__); | |
1656 | req->length = 0; | |
1657 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
1658 | if (value < 0) { | |
1659 | DBG(cdev, "ep_queue --> %d\n", value); | |
1660 | req->status = 0; | |
1661 | composite_setup_complete(cdev->gadget->ep0, req); | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | spin_unlock_irqrestore(&cdev->lock, flags); | |
1666 | } | |
1667 |