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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. | |
40982be5 DB |
10 | */ |
11 | ||
12 | /* #define VERBOSE_DEBUG */ | |
13 | ||
14 | #include <linux/kallsyms.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/slab.h> | |
6eb0de82 | 17 | #include <linux/module.h> |
40982be5 | 18 | #include <linux/device.h> |
ad1a8102 | 19 | #include <linux/utsname.h> |
40982be5 DB |
20 | |
21 | #include <linux/usb/composite.h> | |
bdb64d72 | 22 | #include <asm/unaligned.h> |
40982be5 DB |
23 | |
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 */ | |
dd0543ec | 32 | #define USB_BUFSIZ 1024 |
40982be5 DB |
33 | |
34 | static struct usb_composite_driver *composite; | |
35 | ||
25985edc | 36 | /* Some systems will need runtime overrides for the product identifiers |
40982be5 DB |
37 | * published in the device descriptor, either numbers or strings or both. |
38 | * String parameters are in UTF-8 (superset of ASCII's 7 bit characters). | |
39 | */ | |
40 | ||
41 | static ushort idVendor; | |
4fffd6e5 | 42 | module_param(idVendor, ushort, 0644); |
40982be5 DB |
43 | MODULE_PARM_DESC(idVendor, "USB Vendor ID"); |
44 | ||
45 | static ushort idProduct; | |
4fffd6e5 | 46 | module_param(idProduct, ushort, 0644); |
40982be5 DB |
47 | MODULE_PARM_DESC(idProduct, "USB Product ID"); |
48 | ||
49 | static ushort bcdDevice; | |
4fffd6e5 | 50 | module_param(bcdDevice, ushort, 0644); |
40982be5 DB |
51 | MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); |
52 | ||
53 | static char *iManufacturer; | |
4fffd6e5 | 54 | module_param(iManufacturer, charp, 0644); |
40982be5 DB |
55 | MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); |
56 | ||
57 | static char *iProduct; | |
4fffd6e5 | 58 | module_param(iProduct, charp, 0644); |
40982be5 DB |
59 | MODULE_PARM_DESC(iProduct, "USB Product string"); |
60 | ||
61 | static char *iSerialNumber; | |
4fffd6e5 | 62 | module_param(iSerialNumber, charp, 0644); |
40982be5 DB |
63 | MODULE_PARM_DESC(iSerialNumber, "SerialNumber string"); |
64 | ||
ad1a8102 MN |
65 | static char composite_manufacturer[50]; |
66 | ||
40982be5 | 67 | /*-------------------------------------------------------------------------*/ |
48767a4e TB |
68 | /** |
69 | * next_ep_desc() - advance to the next EP descriptor | |
70 | * @t: currect pointer within descriptor array | |
71 | * | |
72 | * Return: next EP descriptor or NULL | |
73 | * | |
74 | * Iterate over @t until either EP descriptor found or | |
75 | * NULL (that indicates end of list) encountered | |
76 | */ | |
77 | static struct usb_descriptor_header** | |
78 | next_ep_desc(struct usb_descriptor_header **t) | |
79 | { | |
80 | for (; *t; t++) { | |
81 | if ((*t)->bDescriptorType == USB_DT_ENDPOINT) | |
82 | return t; | |
83 | } | |
84 | return NULL; | |
85 | } | |
86 | ||
87 | /* | |
88 | * for_each_ep_desc()- iterate over endpoint descriptors in the | |
89 | * descriptors list | |
90 | * @start: pointer within descriptor array. | |
91 | * @ep_desc: endpoint descriptor to use as the loop cursor | |
92 | */ | |
93 | #define for_each_ep_desc(start, ep_desc) \ | |
94 | for (ep_desc = next_ep_desc(start); \ | |
95 | ep_desc; ep_desc = next_ep_desc(ep_desc+1)) | |
96 | ||
97 | /** | |
98 | * config_ep_by_speed() - configures the given endpoint | |
99 | * according to gadget speed. | |
100 | * @g: pointer to the gadget | |
101 | * @f: usb function | |
102 | * @_ep: the endpoint to configure | |
103 | * | |
104 | * Return: error code, 0 on success | |
105 | * | |
106 | * This function chooses the right descriptors for a given | |
107 | * endpoint according to gadget speed and saves it in the | |
108 | * endpoint desc field. If the endpoint already has a descriptor | |
109 | * assigned to it - overwrites it with currently corresponding | |
110 | * descriptor. The endpoint maxpacket field is updated according | |
111 | * to the chosen descriptor. | |
112 | * Note: the supplied function should hold all the descriptors | |
113 | * for supported speeds | |
114 | */ | |
115 | int config_ep_by_speed(struct usb_gadget *g, | |
116 | struct usb_function *f, | |
117 | struct usb_ep *_ep) | |
118 | { | |
b785ea7c | 119 | struct usb_composite_dev *cdev = get_gadget_data(g); |
48767a4e TB |
120 | struct usb_endpoint_descriptor *chosen_desc = NULL; |
121 | struct usb_descriptor_header **speed_desc = NULL; | |
122 | ||
bdb64d72 TB |
123 | struct usb_ss_ep_comp_descriptor *comp_desc = NULL; |
124 | int want_comp_desc = 0; | |
125 | ||
48767a4e TB |
126 | 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) { | |
bdb64d72 TB |
133 | 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 */ | |
48767a4e TB |
140 | 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 | ||
157 | ep_found: | |
158 | /* commit results */ | |
29cc8897 | 159 | _ep->maxpacket = usb_endpoint_maxp(chosen_desc); |
48767a4e | 160 | _ep->desc = chosen_desc; |
bdb64d72 TB |
161 | _ep->comp_desc = NULL; |
162 | _ep->maxburst = 0; | |
163 | _ep->mult = 0; | |
164 | if (!want_comp_desc) | |
165 | return 0; | |
48767a4e | 166 | |
bdb64d72 TB |
167 | /* |
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)) { | |
bdb64d72 TB |
178 | case USB_ENDPOINT_XFER_ISOC: |
179 | /* mult: bits 1:0 of bmAttributes */ | |
180 | _ep->mult = comp_desc->bmAttributes & 0x3; | |
9e878a6b PZ |
181 | case USB_ENDPOINT_XFER_BULK: |
182 | case USB_ENDPOINT_XFER_INT: | |
b785ea7c | 183 | _ep->maxburst = comp_desc->bMaxBurst + 1; |
bdb64d72 TB |
184 | break; |
185 | default: | |
b785ea7c FB |
186 | if (comp_desc->bMaxBurst != 0) |
187 | ERROR(cdev, "ep0 bMaxBurst must be 0\n"); | |
188 | _ep->maxburst = 1; | |
bdb64d72 TB |
189 | break; |
190 | } | |
191 | } | |
48767a4e TB |
192 | return 0; |
193 | } | |
40982be5 DB |
194 | |
195 | /** | |
196 | * usb_add_function() - add a function to a configuration | |
197 | * @config: the configuration | |
198 | * @function: the function being added | |
199 | * Context: single threaded during gadget setup | |
200 | * | |
201 | * After initialization, each configuration must have one or more | |
202 | * functions added to it. Adding a function involves calling its @bind() | |
203 | * method to allocate resources such as interface and string identifiers | |
204 | * and endpoints. | |
205 | * | |
206 | * This function returns the value of the function's bind(), which is | |
207 | * zero for success else a negative errno value. | |
208 | */ | |
28824b18 | 209 | int usb_add_function(struct usb_configuration *config, |
40982be5 DB |
210 | struct usb_function *function) |
211 | { | |
212 | int value = -EINVAL; | |
213 | ||
214 | DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n", | |
215 | function->name, function, | |
216 | config->label, config); | |
217 | ||
218 | if (!function->set_alt || !function->disable) | |
219 | goto done; | |
220 | ||
221 | function->config = config; | |
222 | list_add_tail(&function->list, &config->functions); | |
223 | ||
224 | /* REVISIT *require* function->bind? */ | |
225 | if (function->bind) { | |
226 | value = function->bind(config, function); | |
227 | if (value < 0) { | |
228 | list_del(&function->list); | |
229 | function->config = NULL; | |
230 | } | |
231 | } else | |
232 | value = 0; | |
233 | ||
234 | /* We allow configurations that don't work at both speeds. | |
235 | * If we run into a lowspeed Linux system, treat it the same | |
236 | * as full speed ... it's the function drivers that will need | |
237 | * to avoid bulk and ISO transfers. | |
238 | */ | |
239 | if (!config->fullspeed && function->descriptors) | |
240 | config->fullspeed = true; | |
241 | if (!config->highspeed && function->hs_descriptors) | |
242 | config->highspeed = true; | |
bdb64d72 TB |
243 | if (!config->superspeed && function->ss_descriptors) |
244 | config->superspeed = true; | |
40982be5 DB |
245 | |
246 | done: | |
247 | if (value) | |
248 | DBG(config->cdev, "adding '%s'/%p --> %d\n", | |
249 | function->name, function, value); | |
250 | return value; | |
251 | } | |
252 | ||
60beed95 DB |
253 | /** |
254 | * usb_function_deactivate - prevent function and gadget enumeration | |
255 | * @function: the function that isn't yet ready to respond | |
256 | * | |
257 | * Blocks response of the gadget driver to host enumeration by | |
258 | * preventing the data line pullup from being activated. This is | |
259 | * normally called during @bind() processing to change from the | |
260 | * initial "ready to respond" state, or when a required resource | |
261 | * becomes available. | |
262 | * | |
263 | * For example, drivers that serve as a passthrough to a userspace | |
264 | * daemon can block enumeration unless that daemon (such as an OBEX, | |
265 | * MTP, or print server) is ready to handle host requests. | |
266 | * | |
267 | * Not all systems support software control of their USB peripheral | |
268 | * data pullups. | |
269 | * | |
270 | * Returns zero on success, else negative errno. | |
271 | */ | |
272 | int usb_function_deactivate(struct usb_function *function) | |
273 | { | |
274 | struct usb_composite_dev *cdev = function->config->cdev; | |
b2bdf3a7 | 275 | unsigned long flags; |
60beed95 DB |
276 | int status = 0; |
277 | ||
b2bdf3a7 | 278 | spin_lock_irqsave(&cdev->lock, flags); |
60beed95 DB |
279 | |
280 | if (cdev->deactivations == 0) | |
281 | status = usb_gadget_disconnect(cdev->gadget); | |
282 | if (status == 0) | |
283 | cdev->deactivations++; | |
284 | ||
b2bdf3a7 | 285 | spin_unlock_irqrestore(&cdev->lock, flags); |
60beed95 DB |
286 | return status; |
287 | } | |
288 | ||
289 | /** | |
290 | * usb_function_activate - allow function and gadget enumeration | |
291 | * @function: function on which usb_function_activate() was called | |
292 | * | |
293 | * Reverses effect of usb_function_deactivate(). If no more functions | |
294 | * are delaying their activation, the gadget driver will respond to | |
295 | * host enumeration procedures. | |
296 | * | |
297 | * Returns zero on success, else negative errno. | |
298 | */ | |
299 | int usb_function_activate(struct usb_function *function) | |
300 | { | |
301 | struct usb_composite_dev *cdev = function->config->cdev; | |
4fefe9f6 | 302 | unsigned long flags; |
60beed95 DB |
303 | int status = 0; |
304 | ||
4fefe9f6 | 305 | spin_lock_irqsave(&cdev->lock, flags); |
60beed95 DB |
306 | |
307 | if (WARN_ON(cdev->deactivations == 0)) | |
308 | status = -EINVAL; | |
309 | else { | |
310 | cdev->deactivations--; | |
311 | if (cdev->deactivations == 0) | |
312 | status = usb_gadget_connect(cdev->gadget); | |
313 | } | |
314 | ||
4fefe9f6 | 315 | spin_unlock_irqrestore(&cdev->lock, flags); |
60beed95 DB |
316 | return status; |
317 | } | |
318 | ||
40982be5 DB |
319 | /** |
320 | * usb_interface_id() - allocate an unused interface ID | |
321 | * @config: configuration associated with the interface | |
322 | * @function: function handling the interface | |
323 | * Context: single threaded during gadget setup | |
324 | * | |
325 | * usb_interface_id() is called from usb_function.bind() callbacks to | |
326 | * allocate new interface IDs. The function driver will then store that | |
327 | * ID in interface, association, CDC union, and other descriptors. It | |
25985edc | 328 | * will also handle any control requests targeted at that interface, |
40982be5 DB |
329 | * particularly changing its altsetting via set_alt(). There may |
330 | * also be class-specific or vendor-specific requests to handle. | |
331 | * | |
332 | * All interface identifier should be allocated using this routine, to | |
333 | * ensure that for example different functions don't wrongly assign | |
334 | * different meanings to the same identifier. Note that since interface | |
25985edc | 335 | * identifiers are configuration-specific, functions used in more than |
40982be5 DB |
336 | * one configuration (or more than once in a given configuration) need |
337 | * multiple versions of the relevant descriptors. | |
338 | * | |
339 | * Returns the interface ID which was allocated; or -ENODEV if no | |
340 | * more interface IDs can be allocated. | |
341 | */ | |
28824b18 | 342 | int usb_interface_id(struct usb_configuration *config, |
40982be5 DB |
343 | struct usb_function *function) |
344 | { | |
345 | unsigned id = config->next_interface_id; | |
346 | ||
347 | if (id < MAX_CONFIG_INTERFACES) { | |
348 | config->interface[id] = function; | |
349 | config->next_interface_id = id + 1; | |
350 | return id; | |
351 | } | |
352 | return -ENODEV; | |
353 | } | |
354 | ||
355 | static int config_buf(struct usb_configuration *config, | |
356 | enum usb_device_speed speed, void *buf, u8 type) | |
357 | { | |
358 | struct usb_config_descriptor *c = buf; | |
359 | void *next = buf + USB_DT_CONFIG_SIZE; | |
360 | int len = USB_BUFSIZ - USB_DT_CONFIG_SIZE; | |
361 | struct usb_function *f; | |
362 | int status; | |
363 | ||
364 | /* write the config descriptor */ | |
365 | c = buf; | |
366 | c->bLength = USB_DT_CONFIG_SIZE; | |
367 | c->bDescriptorType = type; | |
368 | /* wTotalLength is written later */ | |
369 | c->bNumInterfaces = config->next_interface_id; | |
370 | c->bConfigurationValue = config->bConfigurationValue; | |
371 | c->iConfiguration = config->iConfiguration; | |
372 | c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes; | |
36e893d2 | 373 | c->bMaxPower = config->bMaxPower ? : (CONFIG_USB_GADGET_VBUS_DRAW / 2); |
40982be5 DB |
374 | |
375 | /* There may be e.g. OTG descriptors */ | |
376 | if (config->descriptors) { | |
377 | status = usb_descriptor_fillbuf(next, len, | |
378 | config->descriptors); | |
379 | if (status < 0) | |
380 | return status; | |
381 | len -= status; | |
382 | next += status; | |
383 | } | |
384 | ||
385 | /* add each function's descriptors */ | |
386 | list_for_each_entry(f, &config->functions, list) { | |
387 | struct usb_descriptor_header **descriptors; | |
388 | ||
bdb64d72 TB |
389 | switch (speed) { |
390 | case USB_SPEED_SUPER: | |
391 | descriptors = f->ss_descriptors; | |
392 | break; | |
393 | case USB_SPEED_HIGH: | |
40982be5 | 394 | descriptors = f->hs_descriptors; |
bdb64d72 TB |
395 | break; |
396 | default: | |
40982be5 | 397 | descriptors = f->descriptors; |
bdb64d72 TB |
398 | } |
399 | ||
40982be5 DB |
400 | if (!descriptors) |
401 | continue; | |
402 | status = usb_descriptor_fillbuf(next, len, | |
403 | (const struct usb_descriptor_header **) descriptors); | |
404 | if (status < 0) | |
405 | return status; | |
406 | len -= status; | |
407 | next += status; | |
408 | } | |
409 | ||
410 | len = next - buf; | |
411 | c->wTotalLength = cpu_to_le16(len); | |
412 | return len; | |
413 | } | |
414 | ||
415 | static int config_desc(struct usb_composite_dev *cdev, unsigned w_value) | |
416 | { | |
417 | struct usb_gadget *gadget = cdev->gadget; | |
418 | struct usb_configuration *c; | |
419 | u8 type = w_value >> 8; | |
420 | enum usb_device_speed speed = USB_SPEED_UNKNOWN; | |
421 | ||
bdb64d72 TB |
422 | if (gadget->speed == USB_SPEED_SUPER) |
423 | speed = gadget->speed; | |
424 | else if (gadget_is_dualspeed(gadget)) { | |
425 | int hs = 0; | |
40982be5 DB |
426 | if (gadget->speed == USB_SPEED_HIGH) |
427 | hs = 1; | |
428 | if (type == USB_DT_OTHER_SPEED_CONFIG) | |
429 | hs = !hs; | |
430 | if (hs) | |
431 | speed = USB_SPEED_HIGH; | |
432 | ||
433 | } | |
434 | ||
435 | /* This is a lookup by config *INDEX* */ | |
436 | w_value &= 0xff; | |
437 | list_for_each_entry(c, &cdev->configs, list) { | |
438 | /* ignore configs that won't work at this speed */ | |
bdb64d72 TB |
439 | switch (speed) { |
440 | case USB_SPEED_SUPER: | |
441 | if (!c->superspeed) | |
442 | continue; | |
443 | break; | |
444 | case USB_SPEED_HIGH: | |
40982be5 DB |
445 | if (!c->highspeed) |
446 | continue; | |
bdb64d72 TB |
447 | break; |
448 | default: | |
40982be5 DB |
449 | if (!c->fullspeed) |
450 | continue; | |
451 | } | |
bdb64d72 | 452 | |
40982be5 DB |
453 | if (w_value == 0) |
454 | return config_buf(c, speed, cdev->req->buf, type); | |
455 | w_value--; | |
456 | } | |
457 | return -EINVAL; | |
458 | } | |
459 | ||
460 | static int count_configs(struct usb_composite_dev *cdev, unsigned type) | |
461 | { | |
462 | struct usb_gadget *gadget = cdev->gadget; | |
463 | struct usb_configuration *c; | |
464 | unsigned count = 0; | |
465 | int hs = 0; | |
bdb64d72 | 466 | int ss = 0; |
40982be5 DB |
467 | |
468 | if (gadget_is_dualspeed(gadget)) { | |
469 | if (gadget->speed == USB_SPEED_HIGH) | |
470 | hs = 1; | |
bdb64d72 TB |
471 | if (gadget->speed == USB_SPEED_SUPER) |
472 | ss = 1; | |
40982be5 DB |
473 | if (type == USB_DT_DEVICE_QUALIFIER) |
474 | hs = !hs; | |
475 | } | |
476 | list_for_each_entry(c, &cdev->configs, list) { | |
477 | /* ignore configs that won't work at this speed */ | |
bdb64d72 TB |
478 | if (ss) { |
479 | if (!c->superspeed) | |
480 | continue; | |
481 | } else if (hs) { | |
40982be5 DB |
482 | if (!c->highspeed) |
483 | continue; | |
484 | } else { | |
485 | if (!c->fullspeed) | |
486 | continue; | |
487 | } | |
488 | count++; | |
489 | } | |
490 | return count; | |
491 | } | |
492 | ||
bdb64d72 TB |
493 | /** |
494 | * bos_desc() - prepares the BOS descriptor. | |
495 | * @cdev: pointer to usb_composite device to generate the bos | |
496 | * descriptor for | |
497 | * | |
498 | * This function generates the BOS (Binary Device Object) | |
499 | * descriptor and its device capabilities descriptors. The BOS | |
500 | * descriptor should be supported by a SuperSpeed device. | |
501 | */ | |
502 | static int bos_desc(struct usb_composite_dev *cdev) | |
503 | { | |
504 | struct usb_ext_cap_descriptor *usb_ext; | |
505 | struct usb_ss_cap_descriptor *ss_cap; | |
506 | struct usb_dcd_config_params dcd_config_params; | |
507 | struct usb_bos_descriptor *bos = cdev->req->buf; | |
508 | ||
509 | bos->bLength = USB_DT_BOS_SIZE; | |
510 | bos->bDescriptorType = USB_DT_BOS; | |
511 | ||
512 | bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE); | |
513 | bos->bNumDeviceCaps = 0; | |
514 | ||
515 | /* | |
516 | * A SuperSpeed device shall include the USB2.0 extension descriptor | |
517 | * and shall support LPM when operating in USB2.0 HS mode. | |
518 | */ | |
519 | usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength); | |
520 | bos->bNumDeviceCaps++; | |
521 | le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE); | |
522 | usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE; | |
523 | usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY; | |
524 | usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT; | |
525 | usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT); | |
526 | ||
527 | /* | |
528 | * The Superspeed USB Capability descriptor shall be implemented by all | |
529 | * SuperSpeed devices. | |
530 | */ | |
531 | ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength); | |
532 | bos->bNumDeviceCaps++; | |
533 | le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE); | |
534 | ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE; | |
535 | ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY; | |
536 | ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE; | |
537 | ss_cap->bmAttributes = 0; /* LTM is not supported yet */ | |
538 | ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION | | |
539 | USB_FULL_SPEED_OPERATION | | |
540 | USB_HIGH_SPEED_OPERATION | | |
541 | USB_5GBPS_OPERATION); | |
542 | ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION; | |
543 | ||
544 | /* Get Controller configuration */ | |
545 | if (cdev->gadget->ops->get_config_params) | |
546 | cdev->gadget->ops->get_config_params(&dcd_config_params); | |
547 | else { | |
089b837a | 548 | dcd_config_params.bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT; |
bdb64d72 | 549 | dcd_config_params.bU2DevExitLat = |
089b837a | 550 | cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT); |
bdb64d72 TB |
551 | } |
552 | ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat; | |
553 | ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat; | |
554 | ||
555 | return le16_to_cpu(bos->wTotalLength); | |
556 | } | |
557 | ||
40982be5 DB |
558 | static void device_qual(struct usb_composite_dev *cdev) |
559 | { | |
560 | struct usb_qualifier_descriptor *qual = cdev->req->buf; | |
561 | ||
562 | qual->bLength = sizeof(*qual); | |
563 | qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER; | |
564 | /* POLICY: same bcdUSB and device type info at both speeds */ | |
565 | qual->bcdUSB = cdev->desc.bcdUSB; | |
566 | qual->bDeviceClass = cdev->desc.bDeviceClass; | |
567 | qual->bDeviceSubClass = cdev->desc.bDeviceSubClass; | |
568 | qual->bDeviceProtocol = cdev->desc.bDeviceProtocol; | |
569 | /* ASSUME same EP0 fifo size at both speeds */ | |
765f5b83 | 570 | qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket; |
40982be5 | 571 | qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER); |
c24f4227 | 572 | qual->bRESERVED = 0; |
40982be5 DB |
573 | } |
574 | ||
575 | /*-------------------------------------------------------------------------*/ | |
576 | ||
577 | static void reset_config(struct usb_composite_dev *cdev) | |
578 | { | |
579 | struct usb_function *f; | |
580 | ||
581 | DBG(cdev, "reset config\n"); | |
582 | ||
583 | list_for_each_entry(f, &cdev->config->functions, list) { | |
584 | if (f->disable) | |
585 | f->disable(f); | |
5242658d LP |
586 | |
587 | bitmap_zero(f->endpoints, 32); | |
40982be5 DB |
588 | } |
589 | cdev->config = NULL; | |
590 | } | |
591 | ||
592 | static int set_config(struct usb_composite_dev *cdev, | |
593 | const struct usb_ctrlrequest *ctrl, unsigned number) | |
594 | { | |
595 | struct usb_gadget *gadget = cdev->gadget; | |
596 | struct usb_configuration *c = NULL; | |
597 | int result = -EINVAL; | |
598 | unsigned power = gadget_is_otg(gadget) ? 8 : 100; | |
599 | int tmp; | |
600 | ||
40982be5 DB |
601 | if (number) { |
602 | list_for_each_entry(c, &cdev->configs, list) { | |
603 | if (c->bConfigurationValue == number) { | |
bdb64d72 TB |
604 | /* |
605 | * We disable the FDs of the previous | |
606 | * configuration only if the new configuration | |
607 | * is a valid one | |
608 | */ | |
609 | if (cdev->config) | |
610 | reset_config(cdev); | |
40982be5 DB |
611 | result = 0; |
612 | break; | |
613 | } | |
614 | } | |
615 | if (result < 0) | |
616 | goto done; | |
bdb64d72 TB |
617 | } else { /* Zero configuration value - need to reset the config */ |
618 | if (cdev->config) | |
619 | reset_config(cdev); | |
40982be5 | 620 | result = 0; |
bdb64d72 | 621 | } |
40982be5 | 622 | |
e538dfda MN |
623 | INFO(cdev, "%s config #%d: %s\n", |
624 | usb_speed_string(gadget->speed), | |
625 | number, c ? c->label : "unconfigured"); | |
40982be5 DB |
626 | |
627 | if (!c) | |
628 | goto done; | |
629 | ||
630 | cdev->config = c; | |
631 | ||
632 | /* Initialize all interfaces by setting them to altsetting zero. */ | |
633 | for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) { | |
634 | struct usb_function *f = c->interface[tmp]; | |
5242658d | 635 | struct usb_descriptor_header **descriptors; |
40982be5 DB |
636 | |
637 | if (!f) | |
638 | break; | |
639 | ||
5242658d LP |
640 | /* |
641 | * Record which endpoints are used by the function. This is used | |
642 | * to dispatch control requests targeted at that endpoint to the | |
643 | * function's setup callback instead of the current | |
644 | * configuration's setup callback. | |
645 | */ | |
bdb64d72 TB |
646 | switch (gadget->speed) { |
647 | case USB_SPEED_SUPER: | |
648 | descriptors = f->ss_descriptors; | |
649 | break; | |
650 | case USB_SPEED_HIGH: | |
5242658d | 651 | descriptors = f->hs_descriptors; |
bdb64d72 TB |
652 | break; |
653 | default: | |
5242658d | 654 | descriptors = f->descriptors; |
bdb64d72 | 655 | } |
5242658d LP |
656 | |
657 | for (; *descriptors; ++descriptors) { | |
658 | struct usb_endpoint_descriptor *ep; | |
659 | int addr; | |
660 | ||
661 | if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT) | |
662 | continue; | |
663 | ||
664 | ep = (struct usb_endpoint_descriptor *)*descriptors; | |
665 | addr = ((ep->bEndpointAddress & 0x80) >> 3) | |
666 | | (ep->bEndpointAddress & 0x0f); | |
667 | set_bit(addr, f->endpoints); | |
668 | } | |
669 | ||
40982be5 DB |
670 | result = f->set_alt(f, tmp, 0); |
671 | if (result < 0) { | |
672 | DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n", | |
673 | tmp, f->name, f, result); | |
674 | ||
675 | reset_config(cdev); | |
676 | goto done; | |
677 | } | |
1b9ba000 RQ |
678 | |
679 | if (result == USB_GADGET_DELAYED_STATUS) { | |
680 | DBG(cdev, | |
681 | "%s: interface %d (%s) requested delayed status\n", | |
682 | __func__, tmp, f->name); | |
683 | cdev->delayed_status++; | |
684 | DBG(cdev, "delayed_status count %d\n", | |
685 | cdev->delayed_status); | |
686 | } | |
40982be5 DB |
687 | } |
688 | ||
689 | /* when we return, be sure our power usage is valid */ | |
36e893d2 | 690 | power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW; |
40982be5 DB |
691 | done: |
692 | usb_gadget_vbus_draw(gadget, power); | |
1b9ba000 RQ |
693 | if (result >= 0 && cdev->delayed_status) |
694 | result = USB_GADGET_DELAYED_STATUS; | |
40982be5 DB |
695 | return result; |
696 | } | |
697 | ||
698 | /** | |
699 | * usb_add_config() - add a configuration to a device. | |
700 | * @cdev: wraps the USB gadget | |
701 | * @config: the configuration, with bConfigurationValue assigned | |
c9bfff9c | 702 | * @bind: the configuration's bind function |
40982be5 DB |
703 | * Context: single threaded during gadget setup |
704 | * | |
c9bfff9c | 705 | * One of the main tasks of a composite @bind() routine is to |
40982be5 DB |
706 | * add each of the configurations it supports, using this routine. |
707 | * | |
c9bfff9c | 708 | * This function returns the value of the configuration's @bind(), which |
40982be5 DB |
709 | * is zero for success else a negative errno value. Binding configurations |
710 | * assigns global resources including string IDs, and per-configuration | |
711 | * resources such as interface IDs and endpoints. | |
712 | */ | |
28824b18 | 713 | int usb_add_config(struct usb_composite_dev *cdev, |
c9bfff9c UKK |
714 | struct usb_configuration *config, |
715 | int (*bind)(struct usb_configuration *)) | |
40982be5 DB |
716 | { |
717 | int status = -EINVAL; | |
718 | struct usb_configuration *c; | |
719 | ||
720 | DBG(cdev, "adding config #%u '%s'/%p\n", | |
721 | config->bConfigurationValue, | |
722 | config->label, config); | |
723 | ||
c9bfff9c | 724 | if (!config->bConfigurationValue || !bind) |
40982be5 DB |
725 | goto done; |
726 | ||
727 | /* Prevent duplicate configuration identifiers */ | |
728 | list_for_each_entry(c, &cdev->configs, list) { | |
729 | if (c->bConfigurationValue == config->bConfigurationValue) { | |
730 | status = -EBUSY; | |
731 | goto done; | |
732 | } | |
733 | } | |
734 | ||
735 | config->cdev = cdev; | |
736 | list_add_tail(&config->list, &cdev->configs); | |
737 | ||
738 | INIT_LIST_HEAD(&config->functions); | |
739 | config->next_interface_id = 0; | |
02e8161e | 740 | memset(config->interface, 0, sizeof(config->interface)); |
40982be5 | 741 | |
c9bfff9c | 742 | status = bind(config); |
40982be5 | 743 | if (status < 0) { |
124ef389 YO |
744 | while (!list_empty(&config->functions)) { |
745 | struct usb_function *f; | |
746 | ||
747 | f = list_first_entry(&config->functions, | |
748 | struct usb_function, list); | |
749 | list_del(&f->list); | |
750 | if (f->unbind) { | |
751 | DBG(cdev, "unbind function '%s'/%p\n", | |
752 | f->name, f); | |
753 | f->unbind(config, f); | |
754 | /* may free memory for "f" */ | |
755 | } | |
756 | } | |
40982be5 DB |
757 | list_del(&config->list); |
758 | config->cdev = NULL; | |
759 | } else { | |
760 | unsigned i; | |
761 | ||
bdb64d72 | 762 | DBG(cdev, "cfg %d/%p speeds:%s%s%s\n", |
40982be5 | 763 | config->bConfigurationValue, config, |
bdb64d72 | 764 | config->superspeed ? " super" : "", |
40982be5 DB |
765 | config->highspeed ? " high" : "", |
766 | config->fullspeed | |
767 | ? (gadget_is_dualspeed(cdev->gadget) | |
768 | ? " full" | |
769 | : " full/low") | |
770 | : ""); | |
771 | ||
772 | for (i = 0; i < MAX_CONFIG_INTERFACES; i++) { | |
773 | struct usb_function *f = config->interface[i]; | |
774 | ||
775 | if (!f) | |
776 | continue; | |
777 | DBG(cdev, " interface %d = %s/%p\n", | |
778 | i, f->name, f); | |
779 | } | |
780 | } | |
781 | ||
c9bfff9c | 782 | /* set_alt(), or next bind(), sets up |
40982be5 DB |
783 | * ep->driver_data as needed. |
784 | */ | |
785 | usb_ep_autoconfig_reset(cdev->gadget); | |
786 | ||
787 | done: | |
788 | if (status) | |
789 | DBG(cdev, "added config '%s'/%u --> %d\n", config->label, | |
790 | config->bConfigurationValue, status); | |
791 | return status; | |
792 | } | |
793 | ||
51cce6fc BG |
794 | static void remove_config(struct usb_composite_dev *cdev, |
795 | struct usb_configuration *config) | |
796 | { | |
797 | while (!list_empty(&config->functions)) { | |
798 | struct usb_function *f; | |
799 | ||
800 | f = list_first_entry(&config->functions, | |
801 | struct usb_function, list); | |
802 | list_del(&f->list); | |
803 | if (f->unbind) { | |
804 | DBG(cdev, "unbind function '%s'/%p\n", f->name, f); | |
805 | f->unbind(config, f); | |
806 | /* may free memory for "f" */ | |
807 | } | |
808 | } | |
809 | list_del(&config->list); | |
810 | if (config->unbind) { | |
811 | DBG(cdev, "unbind config '%s'/%p\n", config->label, config); | |
812 | config->unbind(config); | |
813 | /* may free memory for "c" */ | |
814 | } | |
815 | } | |
816 | ||
817 | /** | |
818 | * usb_remove_config() - remove a configuration from a device. | |
819 | * @cdev: wraps the USB gadget | |
820 | * @config: the configuration | |
821 | * | |
822 | * Drivers must call usb_gadget_disconnect before calling this function | |
823 | * to disconnect the device from the host and make sure the host will not | |
824 | * try to enumerate the device while we are changing the config list. | |
825 | */ | |
826 | void usb_remove_config(struct usb_composite_dev *cdev, | |
827 | struct usb_configuration *config) | |
828 | { | |
829 | unsigned long flags; | |
830 | ||
831 | spin_lock_irqsave(&cdev->lock, flags); | |
832 | ||
833 | if (cdev->config == config) | |
834 | reset_config(cdev); | |
835 | ||
836 | spin_unlock_irqrestore(&cdev->lock, flags); | |
837 | ||
838 | remove_config(cdev, config); | |
839 | } | |
840 | ||
40982be5 DB |
841 | /*-------------------------------------------------------------------------*/ |
842 | ||
843 | /* We support strings in multiple languages ... string descriptor zero | |
844 | * says which languages are supported. The typical case will be that | |
845 | * only one language (probably English) is used, with I18N handled on | |
846 | * the host side. | |
847 | */ | |
848 | ||
849 | static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf) | |
850 | { | |
851 | const struct usb_gadget_strings *s; | |
20c5e74c | 852 | __le16 language; |
40982be5 DB |
853 | __le16 *tmp; |
854 | ||
855 | while (*sp) { | |
856 | s = *sp; | |
857 | language = cpu_to_le16(s->language); | |
858 | for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) { | |
859 | if (*tmp == language) | |
860 | goto repeat; | |
861 | } | |
862 | *tmp++ = language; | |
863 | repeat: | |
864 | sp++; | |
865 | } | |
866 | } | |
867 | ||
868 | static int lookup_string( | |
869 | struct usb_gadget_strings **sp, | |
870 | void *buf, | |
871 | u16 language, | |
872 | int id | |
873 | ) | |
874 | { | |
875 | struct usb_gadget_strings *s; | |
876 | int value; | |
877 | ||
878 | while (*sp) { | |
879 | s = *sp++; | |
880 | if (s->language != language) | |
881 | continue; | |
882 | value = usb_gadget_get_string(s, id, buf); | |
883 | if (value > 0) | |
884 | return value; | |
885 | } | |
886 | return -EINVAL; | |
887 | } | |
888 | ||
889 | static int get_string(struct usb_composite_dev *cdev, | |
890 | void *buf, u16 language, int id) | |
891 | { | |
892 | struct usb_configuration *c; | |
893 | struct usb_function *f; | |
894 | int len; | |
ad1a8102 | 895 | const char *str; |
40982be5 DB |
896 | |
897 | /* Yes, not only is USB's I18N support probably more than most | |
898 | * folk will ever care about ... also, it's all supported here. | |
899 | * (Except for UTF8 support for Unicode's "Astral Planes".) | |
900 | */ | |
901 | ||
902 | /* 0 == report all available language codes */ | |
903 | if (id == 0) { | |
904 | struct usb_string_descriptor *s = buf; | |
905 | struct usb_gadget_strings **sp; | |
906 | ||
907 | memset(s, 0, 256); | |
908 | s->bDescriptorType = USB_DT_STRING; | |
909 | ||
910 | sp = composite->strings; | |
911 | if (sp) | |
912 | collect_langs(sp, s->wData); | |
913 | ||
914 | list_for_each_entry(c, &cdev->configs, list) { | |
915 | sp = c->strings; | |
916 | if (sp) | |
917 | collect_langs(sp, s->wData); | |
918 | ||
919 | list_for_each_entry(f, &c->functions, list) { | |
920 | sp = f->strings; | |
921 | if (sp) | |
922 | collect_langs(sp, s->wData); | |
923 | } | |
924 | } | |
925 | ||
417b57b3 | 926 | for (len = 0; len <= 126 && s->wData[len]; len++) |
40982be5 DB |
927 | continue; |
928 | if (!len) | |
929 | return -EINVAL; | |
930 | ||
931 | s->bLength = 2 * (len + 1); | |
932 | return s->bLength; | |
933 | } | |
934 | ||
ad1a8102 MN |
935 | /* Otherwise, look up and return a specified string. First |
936 | * check if the string has not been overridden. | |
937 | */ | |
938 | if (cdev->manufacturer_override == id) | |
939 | str = iManufacturer ?: composite->iManufacturer ?: | |
940 | composite_manufacturer; | |
941 | else if (cdev->product_override == id) | |
942 | str = iProduct ?: composite->iProduct; | |
943 | else if (cdev->serial_override == id) | |
cad4cd8f | 944 | str = iSerialNumber ?: composite->iSerialNumber; |
ad1a8102 MN |
945 | else |
946 | str = NULL; | |
947 | if (str) { | |
948 | struct usb_gadget_strings strings = { | |
949 | .language = language, | |
950 | .strings = &(struct usb_string) { 0xff, str } | |
951 | }; | |
952 | return usb_gadget_get_string(&strings, 0xff, buf); | |
953 | } | |
954 | ||
955 | /* String IDs are device-scoped, so we look up each string | |
956 | * table we're told about. These lookups are infrequent; | |
957 | * simpler-is-better here. | |
40982be5 DB |
958 | */ |
959 | if (composite->strings) { | |
960 | len = lookup_string(composite->strings, buf, language, id); | |
961 | if (len > 0) | |
962 | return len; | |
963 | } | |
964 | list_for_each_entry(c, &cdev->configs, list) { | |
965 | if (c->strings) { | |
966 | len = lookup_string(c->strings, buf, language, id); | |
967 | if (len > 0) | |
968 | return len; | |
969 | } | |
970 | list_for_each_entry(f, &c->functions, list) { | |
971 | if (!f->strings) | |
972 | continue; | |
973 | len = lookup_string(f->strings, buf, language, id); | |
974 | if (len > 0) | |
975 | return len; | |
976 | } | |
977 | } | |
978 | return -EINVAL; | |
979 | } | |
980 | ||
981 | /** | |
982 | * usb_string_id() - allocate an unused string ID | |
983 | * @cdev: the device whose string descriptor IDs are being allocated | |
984 | * Context: single threaded during gadget setup | |
985 | * | |
986 | * @usb_string_id() is called from bind() callbacks to allocate | |
987 | * string IDs. Drivers for functions, configurations, or gadgets will | |
988 | * then store that ID in the appropriate descriptors and string table. | |
989 | * | |
f2adc4f8 MN |
990 | * All string identifier should be allocated using this, |
991 | * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure | |
992 | * that for example different functions don't wrongly assign different | |
993 | * meanings to the same identifier. | |
40982be5 | 994 | */ |
28824b18 | 995 | int usb_string_id(struct usb_composite_dev *cdev) |
40982be5 DB |
996 | { |
997 | if (cdev->next_string_id < 254) { | |
f2adc4f8 MN |
998 | /* string id 0 is reserved by USB spec for list of |
999 | * supported languages */ | |
1000 | /* 255 reserved as well? -- mina86 */ | |
40982be5 DB |
1001 | cdev->next_string_id++; |
1002 | return cdev->next_string_id; | |
1003 | } | |
1004 | return -ENODEV; | |
1005 | } | |
1006 | ||
f2adc4f8 MN |
1007 | /** |
1008 | * usb_string_ids() - allocate unused string IDs in batch | |
1009 | * @cdev: the device whose string descriptor IDs are being allocated | |
1010 | * @str: an array of usb_string objects to assign numbers to | |
1011 | * Context: single threaded during gadget setup | |
1012 | * | |
1013 | * @usb_string_ids() is called from bind() callbacks to allocate | |
1014 | * string IDs. Drivers for functions, configurations, or gadgets will | |
1015 | * then copy IDs from the string table to the appropriate descriptors | |
1016 | * and string table for other languages. | |
1017 | * | |
1018 | * All string identifier should be allocated using this, | |
1019 | * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for | |
1020 | * example different functions don't wrongly assign different meanings | |
1021 | * to the same identifier. | |
1022 | */ | |
1023 | int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str) | |
1024 | { | |
1025 | int next = cdev->next_string_id; | |
1026 | ||
1027 | for (; str->s; ++str) { | |
1028 | if (unlikely(next >= 254)) | |
1029 | return -ENODEV; | |
1030 | str->id = ++next; | |
1031 | } | |
1032 | ||
1033 | cdev->next_string_id = next; | |
1034 | ||
1035 | return 0; | |
1036 | } | |
1037 | ||
1038 | /** | |
1039 | * usb_string_ids_n() - allocate unused string IDs in batch | |
d187abb9 | 1040 | * @c: the device whose string descriptor IDs are being allocated |
f2adc4f8 MN |
1041 | * @n: number of string IDs to allocate |
1042 | * Context: single threaded during gadget setup | |
1043 | * | |
1044 | * Returns the first requested ID. This ID and next @n-1 IDs are now | |
d187abb9 | 1045 | * valid IDs. At least provided that @n is non-zero because if it |
f2adc4f8 MN |
1046 | * is, returns last requested ID which is now very useful information. |
1047 | * | |
1048 | * @usb_string_ids_n() is called from bind() callbacks to allocate | |
1049 | * string IDs. Drivers for functions, configurations, or gadgets will | |
1050 | * then store that ID in the appropriate descriptors and string table. | |
1051 | * | |
1052 | * All string identifier should be allocated using this, | |
1053 | * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for | |
1054 | * example different functions don't wrongly assign different meanings | |
1055 | * to the same identifier. | |
1056 | */ | |
1057 | int usb_string_ids_n(struct usb_composite_dev *c, unsigned n) | |
1058 | { | |
1059 | unsigned next = c->next_string_id; | |
1060 | if (unlikely(n > 254 || (unsigned)next + n > 254)) | |
1061 | return -ENODEV; | |
1062 | c->next_string_id += n; | |
1063 | return next + 1; | |
1064 | } | |
1065 | ||
1066 | ||
40982be5 DB |
1067 | /*-------------------------------------------------------------------------*/ |
1068 | ||
1069 | static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req) | |
1070 | { | |
1071 | if (req->status || req->actual != req->length) | |
1072 | DBG((struct usb_composite_dev *) ep->driver_data, | |
1073 | "setup complete --> %d, %d/%d\n", | |
1074 | req->status, req->actual, req->length); | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * The setup() callback implements all the ep0 functionality that's | |
1079 | * not handled lower down, in hardware or the hardware driver(like | |
1080 | * device and endpoint feature flags, and their status). It's all | |
1081 | * housekeeping for the gadget function we're implementing. Most of | |
1082 | * the work is in config and function specific setup. | |
1083 | */ | |
1084 | static int | |
1085 | composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) | |
1086 | { | |
1087 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1088 | struct usb_request *req = cdev->req; | |
1089 | int value = -EOPNOTSUPP; | |
bdb64d72 | 1090 | int status = 0; |
40982be5 | 1091 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
08889517 | 1092 | u8 intf = w_index & 0xFF; |
40982be5 DB |
1093 | u16 w_value = le16_to_cpu(ctrl->wValue); |
1094 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
1095 | struct usb_function *f = NULL; | |
5242658d | 1096 | u8 endp; |
40982be5 DB |
1097 | |
1098 | /* partial re-init of the response message; the function or the | |
1099 | * gadget might need to intercept e.g. a control-OUT completion | |
1100 | * when we delegate to it. | |
1101 | */ | |
1102 | req->zero = 0; | |
1103 | req->complete = composite_setup_complete; | |
2edb11cb | 1104 | req->length = 0; |
40982be5 DB |
1105 | gadget->ep0->driver_data = cdev; |
1106 | ||
1107 | switch (ctrl->bRequest) { | |
1108 | ||
1109 | /* we handle all standard USB descriptors */ | |
1110 | case USB_REQ_GET_DESCRIPTOR: | |
1111 | if (ctrl->bRequestType != USB_DIR_IN) | |
1112 | goto unknown; | |
1113 | switch (w_value >> 8) { | |
1114 | ||
1115 | case USB_DT_DEVICE: | |
1116 | cdev->desc.bNumConfigurations = | |
1117 | count_configs(cdev, USB_DT_DEVICE); | |
bdb64d72 TB |
1118 | cdev->desc.bMaxPacketSize0 = |
1119 | cdev->gadget->ep0->maxpacket; | |
1120 | if (gadget_is_superspeed(gadget)) { | |
a8f21156 | 1121 | if (gadget->speed >= USB_SPEED_SUPER) { |
bdb64d72 | 1122 | cdev->desc.bcdUSB = cpu_to_le16(0x0300); |
a8f21156 SAS |
1123 | cdev->desc.bMaxPacketSize0 = 9; |
1124 | } else { | |
bdb64d72 | 1125 | cdev->desc.bcdUSB = cpu_to_le16(0x0210); |
a8f21156 | 1126 | } |
bdb64d72 TB |
1127 | } |
1128 | ||
40982be5 DB |
1129 | value = min(w_length, (u16) sizeof cdev->desc); |
1130 | memcpy(req->buf, &cdev->desc, value); | |
1131 | break; | |
1132 | case USB_DT_DEVICE_QUALIFIER: | |
bdb64d72 TB |
1133 | if (!gadget_is_dualspeed(gadget) || |
1134 | gadget->speed >= USB_SPEED_SUPER) | |
40982be5 DB |
1135 | break; |
1136 | device_qual(cdev); | |
1137 | value = min_t(int, w_length, | |
1138 | sizeof(struct usb_qualifier_descriptor)); | |
1139 | break; | |
1140 | case USB_DT_OTHER_SPEED_CONFIG: | |
bdb64d72 TB |
1141 | if (!gadget_is_dualspeed(gadget) || |
1142 | gadget->speed >= USB_SPEED_SUPER) | |
40982be5 DB |
1143 | break; |
1144 | /* FALLTHROUGH */ | |
1145 | case USB_DT_CONFIG: | |
1146 | value = config_desc(cdev, w_value); | |
1147 | if (value >= 0) | |
1148 | value = min(w_length, (u16) value); | |
1149 | break; | |
1150 | case USB_DT_STRING: | |
1151 | value = get_string(cdev, req->buf, | |
1152 | w_index, w_value & 0xff); | |
1153 | if (value >= 0) | |
1154 | value = min(w_length, (u16) value); | |
1155 | break; | |
bdb64d72 TB |
1156 | case USB_DT_BOS: |
1157 | if (gadget_is_superspeed(gadget)) { | |
1158 | value = bos_desc(cdev); | |
1159 | value = min(w_length, (u16) value); | |
1160 | } | |
1161 | break; | |
40982be5 DB |
1162 | } |
1163 | break; | |
1164 | ||
1165 | /* any number of configs can work */ | |
1166 | case USB_REQ_SET_CONFIGURATION: | |
1167 | if (ctrl->bRequestType != 0) | |
1168 | goto unknown; | |
1169 | if (gadget_is_otg(gadget)) { | |
1170 | if (gadget->a_hnp_support) | |
1171 | DBG(cdev, "HNP available\n"); | |
1172 | else if (gadget->a_alt_hnp_support) | |
1173 | DBG(cdev, "HNP on another port\n"); | |
1174 | else | |
1175 | VDBG(cdev, "HNP inactive\n"); | |
1176 | } | |
1177 | spin_lock(&cdev->lock); | |
1178 | value = set_config(cdev, ctrl, w_value); | |
1179 | spin_unlock(&cdev->lock); | |
1180 | break; | |
1181 | case USB_REQ_GET_CONFIGURATION: | |
1182 | if (ctrl->bRequestType != USB_DIR_IN) | |
1183 | goto unknown; | |
1184 | if (cdev->config) | |
1185 | *(u8 *)req->buf = cdev->config->bConfigurationValue; | |
1186 | else | |
1187 | *(u8 *)req->buf = 0; | |
1188 | value = min(w_length, (u16) 1); | |
1189 | break; | |
1190 | ||
1191 | /* function drivers must handle get/set altsetting; if there's | |
1192 | * no get() method, we know only altsetting zero works. | |
1193 | */ | |
1194 | case USB_REQ_SET_INTERFACE: | |
1195 | if (ctrl->bRequestType != USB_RECIP_INTERFACE) | |
1196 | goto unknown; | |
ff085de7 | 1197 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) |
40982be5 | 1198 | break; |
08889517 | 1199 | f = cdev->config->interface[intf]; |
40982be5 DB |
1200 | if (!f) |
1201 | break; | |
dd4dff8b | 1202 | if (w_value && !f->set_alt) |
40982be5 DB |
1203 | break; |
1204 | value = f->set_alt(f, w_index, w_value); | |
1b9ba000 RQ |
1205 | if (value == USB_GADGET_DELAYED_STATUS) { |
1206 | DBG(cdev, | |
1207 | "%s: interface %d (%s) requested delayed status\n", | |
1208 | __func__, intf, f->name); | |
1209 | cdev->delayed_status++; | |
1210 | DBG(cdev, "delayed_status count %d\n", | |
1211 | cdev->delayed_status); | |
1212 | } | |
40982be5 DB |
1213 | break; |
1214 | case USB_REQ_GET_INTERFACE: | |
1215 | if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) | |
1216 | goto unknown; | |
ff085de7 | 1217 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) |
40982be5 | 1218 | break; |
08889517 | 1219 | f = cdev->config->interface[intf]; |
40982be5 DB |
1220 | if (!f) |
1221 | break; | |
1222 | /* lots of interfaces only need altsetting zero... */ | |
1223 | value = f->get_alt ? f->get_alt(f, w_index) : 0; | |
1224 | if (value < 0) | |
1225 | break; | |
1226 | *((u8 *)req->buf) = value; | |
1227 | value = min(w_length, (u16) 1); | |
1228 | break; | |
bdb64d72 TB |
1229 | |
1230 | /* | |
1231 | * USB 3.0 additions: | |
1232 | * Function driver should handle get_status request. If such cb | |
1233 | * wasn't supplied we respond with default value = 0 | |
1234 | * Note: function driver should supply such cb only for the first | |
1235 | * interface of the function | |
1236 | */ | |
1237 | case USB_REQ_GET_STATUS: | |
1238 | if (!gadget_is_superspeed(gadget)) | |
1239 | goto unknown; | |
1240 | if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE)) | |
1241 | goto unknown; | |
1242 | value = 2; /* This is the length of the get_status reply */ | |
1243 | put_unaligned_le16(0, req->buf); | |
1244 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) | |
1245 | break; | |
1246 | f = cdev->config->interface[intf]; | |
1247 | if (!f) | |
1248 | break; | |
1249 | status = f->get_status ? f->get_status(f) : 0; | |
1250 | if (status < 0) | |
1251 | break; | |
1252 | put_unaligned_le16(status & 0x0000ffff, req->buf); | |
1253 | break; | |
1254 | /* | |
1255 | * Function drivers should handle SetFeature/ClearFeature | |
1256 | * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied | |
1257 | * only for the first interface of the function | |
1258 | */ | |
1259 | case USB_REQ_CLEAR_FEATURE: | |
1260 | case USB_REQ_SET_FEATURE: | |
1261 | if (!gadget_is_superspeed(gadget)) | |
1262 | goto unknown; | |
1263 | if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE)) | |
1264 | goto unknown; | |
1265 | switch (w_value) { | |
1266 | case USB_INTRF_FUNC_SUSPEND: | |
1267 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) | |
1268 | break; | |
1269 | f = cdev->config->interface[intf]; | |
1270 | if (!f) | |
1271 | break; | |
1272 | value = 0; | |
1273 | if (f->func_suspend) | |
1274 | value = f->func_suspend(f, w_index >> 8); | |
1275 | if (value < 0) { | |
1276 | ERROR(cdev, | |
1277 | "func_suspend() returned error %d\n", | |
1278 | value); | |
1279 | value = 0; | |
1280 | } | |
1281 | break; | |
1282 | } | |
1283 | break; | |
40982be5 DB |
1284 | default: |
1285 | unknown: | |
1286 | VDBG(cdev, | |
1287 | "non-core control req%02x.%02x v%04x i%04x l%d\n", | |
1288 | ctrl->bRequestType, ctrl->bRequest, | |
1289 | w_value, w_index, w_length); | |
1290 | ||
5242658d LP |
1291 | /* functions always handle their interfaces and endpoints... |
1292 | * punt other recipients (other, WUSB, ...) to the current | |
40982be5 DB |
1293 | * configuration code. |
1294 | * | |
1295 | * REVISIT it could make sense to let the composite device | |
1296 | * take such requests too, if that's ever needed: to work | |
1297 | * in config 0, etc. | |
1298 | */ | |
5242658d LP |
1299 | switch (ctrl->bRequestType & USB_RECIP_MASK) { |
1300 | case USB_RECIP_INTERFACE: | |
ff085de7 | 1301 | if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) |
3c47eb06 MM |
1302 | break; |
1303 | f = cdev->config->interface[intf]; | |
5242658d LP |
1304 | break; |
1305 | ||
1306 | case USB_RECIP_ENDPOINT: | |
1307 | endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f); | |
1308 | list_for_each_entry(f, &cdev->config->functions, list) { | |
1309 | if (test_bit(endp, f->endpoints)) | |
1310 | break; | |
1311 | } | |
1312 | if (&f->list == &cdev->config->functions) | |
40982be5 | 1313 | f = NULL; |
5242658d | 1314 | break; |
40982be5 | 1315 | } |
5242658d LP |
1316 | |
1317 | if (f && f->setup) | |
1318 | value = f->setup(f, ctrl); | |
1319 | else { | |
40982be5 DB |
1320 | struct usb_configuration *c; |
1321 | ||
1322 | c = cdev->config; | |
1323 | if (c && c->setup) | |
1324 | value = c->setup(c, ctrl); | |
1325 | } | |
1326 | ||
1327 | goto done; | |
1328 | } | |
1329 | ||
1330 | /* respond with data transfer before status phase? */ | |
1b9ba000 | 1331 | if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) { |
40982be5 DB |
1332 | req->length = value; |
1333 | req->zero = value < w_length; | |
1334 | value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); | |
1335 | if (value < 0) { | |
1336 | DBG(cdev, "ep_queue --> %d\n", value); | |
1337 | req->status = 0; | |
1338 | composite_setup_complete(gadget->ep0, req); | |
1339 | } | |
1b9ba000 RQ |
1340 | } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) { |
1341 | WARN(cdev, | |
1342 | "%s: Delayed status not supported for w_length != 0", | |
1343 | __func__); | |
40982be5 DB |
1344 | } |
1345 | ||
1346 | done: | |
1347 | /* device either stalls (value < 0) or reports success */ | |
1348 | return value; | |
1349 | } | |
1350 | ||
1351 | static void composite_disconnect(struct usb_gadget *gadget) | |
1352 | { | |
1353 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1354 | unsigned long flags; | |
1355 | ||
1356 | /* REVISIT: should we have config and device level | |
1357 | * disconnect callbacks? | |
1358 | */ | |
1359 | spin_lock_irqsave(&cdev->lock, flags); | |
1360 | if (cdev->config) | |
1361 | reset_config(cdev); | |
3f3e12d0 MN |
1362 | if (composite->disconnect) |
1363 | composite->disconnect(cdev); | |
40982be5 DB |
1364 | spin_unlock_irqrestore(&cdev->lock, flags); |
1365 | } | |
1366 | ||
1367 | /*-------------------------------------------------------------------------*/ | |
1368 | ||
f48cf80f FC |
1369 | static ssize_t composite_show_suspended(struct device *dev, |
1370 | struct device_attribute *attr, | |
1371 | char *buf) | |
1372 | { | |
1373 | struct usb_gadget *gadget = dev_to_usb_gadget(dev); | |
1374 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1375 | ||
1376 | return sprintf(buf, "%d\n", cdev->suspended); | |
1377 | } | |
1378 | ||
1379 | static DEVICE_ATTR(suspended, 0444, composite_show_suspended, NULL); | |
1380 | ||
28824b18 | 1381 | static void |
40982be5 DB |
1382 | composite_unbind(struct usb_gadget *gadget) |
1383 | { | |
1384 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1385 | ||
1386 | /* composite_disconnect() must already have been called | |
1387 | * by the underlying peripheral controller driver! | |
1388 | * so there's no i/o concurrency that could affect the | |
1389 | * state protected by cdev->lock. | |
1390 | */ | |
1391 | WARN_ON(cdev->config); | |
1392 | ||
1393 | while (!list_empty(&cdev->configs)) { | |
1394 | struct usb_configuration *c; | |
40982be5 DB |
1395 | c = list_first_entry(&cdev->configs, |
1396 | struct usb_configuration, list); | |
51cce6fc | 1397 | remove_config(cdev, c); |
40982be5 DB |
1398 | } |
1399 | if (composite->unbind) | |
1400 | composite->unbind(cdev); | |
1401 | ||
1402 | if (cdev->req) { | |
1403 | kfree(cdev->req->buf); | |
1404 | usb_ep_free_request(gadget->ep0, cdev->req); | |
1405 | } | |
daba5803 | 1406 | device_remove_file(&gadget->dev, &dev_attr_suspended); |
40982be5 DB |
1407 | kfree(cdev); |
1408 | set_gadget_data(gadget, NULL); | |
1409 | composite = NULL; | |
1410 | } | |
1411 | ||
ad1a8102 | 1412 | static u8 override_id(struct usb_composite_dev *cdev, u8 *desc) |
40982be5 | 1413 | { |
ad1a8102 MN |
1414 | if (!*desc) { |
1415 | int ret = usb_string_id(cdev); | |
1416 | if (unlikely(ret < 0)) | |
1417 | WARNING(cdev, "failed to override string ID\n"); | |
1418 | else | |
1419 | *desc = ret; | |
40982be5 | 1420 | } |
40982be5 | 1421 | |
ad1a8102 | 1422 | return *desc; |
40982be5 DB |
1423 | } |
1424 | ||
28824b18 | 1425 | static int composite_bind(struct usb_gadget *gadget) |
40982be5 DB |
1426 | { |
1427 | struct usb_composite_dev *cdev; | |
1428 | int status = -ENOMEM; | |
1429 | ||
1430 | cdev = kzalloc(sizeof *cdev, GFP_KERNEL); | |
1431 | if (!cdev) | |
1432 | return status; | |
1433 | ||
1434 | spin_lock_init(&cdev->lock); | |
1435 | cdev->gadget = gadget; | |
1436 | set_gadget_data(gadget, cdev); | |
1437 | INIT_LIST_HEAD(&cdev->configs); | |
1438 | ||
1439 | /* preallocate control response and buffer */ | |
1440 | cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); | |
1441 | if (!cdev->req) | |
1442 | goto fail; | |
1443 | cdev->req->buf = kmalloc(USB_BUFSIZ, GFP_KERNEL); | |
1444 | if (!cdev->req->buf) | |
1445 | goto fail; | |
1446 | cdev->req->complete = composite_setup_complete; | |
1447 | gadget->ep0->driver_data = cdev; | |
1448 | ||
1449 | cdev->bufsiz = USB_BUFSIZ; | |
1450 | cdev->driver = composite; | |
1451 | ||
37b5801e PM |
1452 | /* |
1453 | * As per USB compliance update, a device that is actively drawing | |
1454 | * more than 100mA from USB must report itself as bus-powered in | |
1455 | * the GetStatus(DEVICE) call. | |
1456 | */ | |
1457 | if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW) | |
1458 | usb_gadget_set_selfpowered(gadget); | |
40982be5 DB |
1459 | |
1460 | /* interface and string IDs start at zero via kzalloc. | |
1461 | * we force endpoints to start unassigned; few controller | |
1462 | * drivers will zero ep->driver_data. | |
1463 | */ | |
1464 | usb_ep_autoconfig_reset(cdev->gadget); | |
1465 | ||
1466 | /* composite gadget needs to assign strings for whole device (like | |
1467 | * serial number), register function drivers, potentially update | |
1468 | * power state and consumption, etc | |
1469 | */ | |
fac3a43e | 1470 | status = composite->bind(cdev); |
40982be5 DB |
1471 | if (status < 0) |
1472 | goto fail; | |
1473 | ||
1474 | cdev->desc = *composite->dev; | |
40982be5 | 1475 | |
dbb442b8 GKH |
1476 | /* standardized runtime overrides for device ID data */ |
1477 | if (idVendor) | |
1478 | cdev->desc.idVendor = cpu_to_le16(idVendor); | |
4fffd6e5 AP |
1479 | else |
1480 | idVendor = le16_to_cpu(cdev->desc.idVendor); | |
dbb442b8 GKH |
1481 | if (idProduct) |
1482 | cdev->desc.idProduct = cpu_to_le16(idProduct); | |
4fffd6e5 AP |
1483 | else |
1484 | idProduct = le16_to_cpu(cdev->desc.idProduct); | |
dbb442b8 GKH |
1485 | if (bcdDevice) |
1486 | cdev->desc.bcdDevice = cpu_to_le16(bcdDevice); | |
4fffd6e5 AP |
1487 | else |
1488 | bcdDevice = le16_to_cpu(cdev->desc.bcdDevice); | |
dbb442b8 | 1489 | |
78bff3c6 | 1490 | /* string overrides */ |
ad1a8102 MN |
1491 | if (iManufacturer || !cdev->desc.iManufacturer) { |
1492 | if (!iManufacturer && !composite->iManufacturer && | |
1493 | !*composite_manufacturer) | |
1494 | snprintf(composite_manufacturer, | |
1495 | sizeof composite_manufacturer, | |
1496 | "%s %s with %s", | |
1497 | init_utsname()->sysname, | |
1498 | init_utsname()->release, | |
1499 | gadget->name); | |
1500 | ||
1501 | cdev->manufacturer_override = | |
1502 | override_id(cdev, &cdev->desc.iManufacturer); | |
1503 | } | |
1504 | ||
1505 | if (iProduct || (!cdev->desc.iProduct && composite->iProduct)) | |
1506 | cdev->product_override = | |
1507 | override_id(cdev, &cdev->desc.iProduct); | |
1508 | ||
cad4cd8f AP |
1509 | if (iSerialNumber || |
1510 | (!cdev->desc.iSerialNumber && composite->iSerialNumber)) | |
ad1a8102 MN |
1511 | cdev->serial_override = |
1512 | override_id(cdev, &cdev->desc.iSerialNumber); | |
1513 | ||
1514 | /* has userspace failed to provide a serial number? */ | |
1515 | if (composite->needs_serial && !cdev->desc.iSerialNumber) | |
1516 | WARNING(cdev, "userspace failed to provide iSerialNumber\n"); | |
40982be5 | 1517 | |
ad1a8102 | 1518 | /* finish up */ |
f48cf80f FC |
1519 | status = device_create_file(&gadget->dev, &dev_attr_suspended); |
1520 | if (status) | |
1521 | goto fail; | |
1522 | ||
40982be5 DB |
1523 | INFO(cdev, "%s ready\n", composite->name); |
1524 | return 0; | |
1525 | ||
1526 | fail: | |
1527 | composite_unbind(gadget); | |
1528 | return status; | |
1529 | } | |
1530 | ||
1531 | /*-------------------------------------------------------------------------*/ | |
1532 | ||
1533 | static void | |
1534 | composite_suspend(struct usb_gadget *gadget) | |
1535 | { | |
1536 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1537 | struct usb_function *f; | |
1538 | ||
8942939a | 1539 | /* REVISIT: should we have config level |
40982be5 DB |
1540 | * suspend/resume callbacks? |
1541 | */ | |
1542 | DBG(cdev, "suspend\n"); | |
1543 | if (cdev->config) { | |
1544 | list_for_each_entry(f, &cdev->config->functions, list) { | |
1545 | if (f->suspend) | |
1546 | f->suspend(f); | |
1547 | } | |
1548 | } | |
8942939a DB |
1549 | if (composite->suspend) |
1550 | composite->suspend(cdev); | |
f48cf80f FC |
1551 | |
1552 | cdev->suspended = 1; | |
b23f2f94 HW |
1553 | |
1554 | usb_gadget_vbus_draw(gadget, 2); | |
40982be5 DB |
1555 | } |
1556 | ||
1557 | static void | |
1558 | composite_resume(struct usb_gadget *gadget) | |
1559 | { | |
1560 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1561 | struct usb_function *f; | |
b23f2f94 | 1562 | u8 maxpower; |
40982be5 | 1563 | |
8942939a | 1564 | /* REVISIT: should we have config level |
40982be5 DB |
1565 | * suspend/resume callbacks? |
1566 | */ | |
1567 | DBG(cdev, "resume\n"); | |
8942939a DB |
1568 | if (composite->resume) |
1569 | composite->resume(cdev); | |
40982be5 DB |
1570 | if (cdev->config) { |
1571 | list_for_each_entry(f, &cdev->config->functions, list) { | |
1572 | if (f->resume) | |
1573 | f->resume(f); | |
1574 | } | |
b23f2f94 HW |
1575 | |
1576 | maxpower = cdev->config->bMaxPower; | |
1577 | ||
1578 | usb_gadget_vbus_draw(gadget, maxpower ? | |
1579 | (2 * maxpower) : CONFIG_USB_GADGET_VBUS_DRAW); | |
40982be5 | 1580 | } |
f48cf80f FC |
1581 | |
1582 | cdev->suspended = 0; | |
40982be5 DB |
1583 | } |
1584 | ||
1585 | /*-------------------------------------------------------------------------*/ | |
1586 | ||
1587 | static struct usb_gadget_driver composite_driver = { | |
915c8bef | 1588 | .unbind = composite_unbind, |
40982be5 DB |
1589 | |
1590 | .setup = composite_setup, | |
1591 | .disconnect = composite_disconnect, | |
1592 | ||
1593 | .suspend = composite_suspend, | |
1594 | .resume = composite_resume, | |
1595 | ||
1596 | .driver = { | |
1597 | .owner = THIS_MODULE, | |
1598 | }, | |
1599 | }; | |
1600 | ||
1601 | /** | |
07a18bd7 | 1602 | * usb_composite_probe() - register a composite driver |
40982be5 | 1603 | * @driver: the driver to register |
07a18bd7 MN |
1604 | * @bind: the callback used to allocate resources that are shared across the |
1605 | * whole device, such as string IDs, and add its configurations using | |
1606 | * @usb_add_config(). This may fail by returning a negative errno | |
1607 | * value; it should return zero on successful initialization. | |
40982be5 DB |
1608 | * Context: single threaded during gadget setup |
1609 | * | |
1610 | * This function is used to register drivers using the composite driver | |
1611 | * framework. The return value is zero, or a negative errno value. | |
1612 | * Those values normally come from the driver's @bind method, which does | |
1613 | * all the work of setting up the driver to match the hardware. | |
1614 | * | |
1615 | * On successful return, the gadget is ready to respond to requests from | |
1616 | * the host, unless one of its components invokes usb_gadget_disconnect() | |
1617 | * while it was binding. That would usually be done in order to wait for | |
1618 | * some userspace participation. | |
1619 | */ | |
05c3eebd | 1620 | int usb_composite_probe(struct usb_composite_driver *driver, |
07a18bd7 | 1621 | int (*bind)(struct usb_composite_dev *cdev)) |
40982be5 | 1622 | { |
fac3a43e SAS |
1623 | if (!driver || !driver->dev || composite) |
1624 | return -EINVAL; | |
1625 | if (!bind && !driver->bind) | |
40982be5 DB |
1626 | return -EINVAL; |
1627 | ||
1628 | if (!driver->name) | |
1629 | driver->name = "composite"; | |
05c3eebd JB |
1630 | if (!driver->iProduct) |
1631 | driver->iProduct = driver->name; | |
40982be5 DB |
1632 | composite_driver.function = (char *) driver->name; |
1633 | composite_driver.driver.name = driver->name; | |
85b8614d | 1634 | composite_driver.max_speed = driver->max_speed; |
40982be5 | 1635 | composite = driver; |
fac3a43e SAS |
1636 | if (!driver->bind) |
1637 | driver->bind = bind; | |
40982be5 | 1638 | |
b0fca50f | 1639 | return usb_gadget_probe_driver(&composite_driver, composite_bind); |
40982be5 DB |
1640 | } |
1641 | ||
1642 | /** | |
1643 | * usb_composite_unregister() - unregister a composite driver | |
1644 | * @driver: the driver to unregister | |
1645 | * | |
1646 | * This function is used to unregister drivers using the composite | |
1647 | * driver framework. | |
1648 | */ | |
28824b18 | 1649 | void usb_composite_unregister(struct usb_composite_driver *driver) |
40982be5 DB |
1650 | { |
1651 | if (composite != driver) | |
1652 | return; | |
1653 | usb_gadget_unregister_driver(&composite_driver); | |
1654 | } | |
1b9ba000 RQ |
1655 | |
1656 | /** | |
1657 | * usb_composite_setup_continue() - Continue with the control transfer | |
1658 | * @cdev: the composite device who's control transfer was kept waiting | |
1659 | * | |
1660 | * This function must be called by the USB function driver to continue | |
1661 | * with the control transfer's data/status stage in case it had requested to | |
1662 | * delay the data/status stages. A USB function's setup handler (e.g. set_alt()) | |
1663 | * can request the composite framework to delay the setup request's data/status | |
1664 | * stages by returning USB_GADGET_DELAYED_STATUS. | |
1665 | */ | |
1666 | void usb_composite_setup_continue(struct usb_composite_dev *cdev) | |
1667 | { | |
1668 | int value; | |
1669 | struct usb_request *req = cdev->req; | |
1670 | unsigned long flags; | |
1671 | ||
1672 | DBG(cdev, "%s\n", __func__); | |
1673 | spin_lock_irqsave(&cdev->lock, flags); | |
1674 | ||
1675 | if (cdev->delayed_status == 0) { | |
1676 | WARN(cdev, "%s: Unexpected call\n", __func__); | |
1677 | ||
1678 | } else if (--cdev->delayed_status == 0) { | |
1679 | DBG(cdev, "%s: Completing delayed status\n", __func__); | |
1680 | req->length = 0; | |
1681 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); | |
1682 | if (value < 0) { | |
1683 | DBG(cdev, "ep_queue --> %d\n", value); | |
1684 | req->status = 0; | |
1685 | composite_setup_complete(cdev->gadget->ep0, req); | |
1686 | } | |
1687 | } | |
1688 | ||
1689 | spin_unlock_irqrestore(&cdev->lock, flags); | |
1690 | } | |
1691 |