Commit | Line | Data |
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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. | |
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> | |
27 | ||
28 | #include <linux/usb/composite.h> | |
29 | ||
30 | ||
31 | /* | |
32 | * The code in this file is utility code, used to build a gadget driver | |
33 | * from one or more "function" drivers, one or more "configuration" | |
34 | * objects, and a "usb_composite_driver" by gluing them together along | |
35 | * with the relevant device-wide data. | |
36 | */ | |
37 | ||
38 | /* big enough to hold our biggest descriptor */ | |
39 | #define USB_BUFSIZ 512 | |
40 | ||
41 | static struct usb_composite_driver *composite; | |
42 | ||
43 | /* Some systems will need runtime overrides for the product identifers | |
44 | * published in the device descriptor, either numbers or strings or both. | |
45 | * String parameters are in UTF-8 (superset of ASCII's 7 bit characters). | |
46 | */ | |
47 | ||
48 | static ushort idVendor; | |
49 | module_param(idVendor, ushort, 0); | |
50 | MODULE_PARM_DESC(idVendor, "USB Vendor ID"); | |
51 | ||
52 | static ushort idProduct; | |
53 | module_param(idProduct, ushort, 0); | |
54 | MODULE_PARM_DESC(idProduct, "USB Product ID"); | |
55 | ||
56 | static ushort bcdDevice; | |
57 | module_param(bcdDevice, ushort, 0); | |
58 | MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); | |
59 | ||
60 | static char *iManufacturer; | |
61 | module_param(iManufacturer, charp, 0); | |
62 | MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); | |
63 | ||
64 | static char *iProduct; | |
65 | module_param(iProduct, charp, 0); | |
66 | MODULE_PARM_DESC(iProduct, "USB Product string"); | |
67 | ||
68 | static char *iSerialNumber; | |
69 | module_param(iSerialNumber, charp, 0); | |
70 | MODULE_PARM_DESC(iSerialNumber, "SerialNumber string"); | |
71 | ||
72 | /*-------------------------------------------------------------------------*/ | |
73 | ||
74 | /** | |
75 | * usb_add_function() - add a function to a configuration | |
76 | * @config: the configuration | |
77 | * @function: the function being added | |
78 | * Context: single threaded during gadget setup | |
79 | * | |
80 | * After initialization, each configuration must have one or more | |
81 | * functions added to it. Adding a function involves calling its @bind() | |
82 | * method to allocate resources such as interface and string identifiers | |
83 | * and endpoints. | |
84 | * | |
85 | * This function returns the value of the function's bind(), which is | |
86 | * zero for success else a negative errno value. | |
87 | */ | |
88 | int __init usb_add_function(struct usb_configuration *config, | |
89 | struct usb_function *function) | |
90 | { | |
91 | int value = -EINVAL; | |
92 | ||
93 | DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n", | |
94 | function->name, function, | |
95 | config->label, config); | |
96 | ||
97 | if (!function->set_alt || !function->disable) | |
98 | goto done; | |
99 | ||
100 | function->config = config; | |
101 | list_add_tail(&function->list, &config->functions); | |
102 | ||
103 | /* REVISIT *require* function->bind? */ | |
104 | if (function->bind) { | |
105 | value = function->bind(config, function); | |
106 | if (value < 0) { | |
107 | list_del(&function->list); | |
108 | function->config = NULL; | |
109 | } | |
110 | } else | |
111 | value = 0; | |
112 | ||
113 | /* We allow configurations that don't work at both speeds. | |
114 | * If we run into a lowspeed Linux system, treat it the same | |
115 | * as full speed ... it's the function drivers that will need | |
116 | * to avoid bulk and ISO transfers. | |
117 | */ | |
118 | if (!config->fullspeed && function->descriptors) | |
119 | config->fullspeed = true; | |
120 | if (!config->highspeed && function->hs_descriptors) | |
121 | config->highspeed = true; | |
122 | ||
123 | done: | |
124 | if (value) | |
125 | DBG(config->cdev, "adding '%s'/%p --> %d\n", | |
126 | function->name, function, value); | |
127 | return value; | |
128 | } | |
129 | ||
60beed95 DB |
130 | /** |
131 | * usb_function_deactivate - prevent function and gadget enumeration | |
132 | * @function: the function that isn't yet ready to respond | |
133 | * | |
134 | * Blocks response of the gadget driver to host enumeration by | |
135 | * preventing the data line pullup from being activated. This is | |
136 | * normally called during @bind() processing to change from the | |
137 | * initial "ready to respond" state, or when a required resource | |
138 | * becomes available. | |
139 | * | |
140 | * For example, drivers that serve as a passthrough to a userspace | |
141 | * daemon can block enumeration unless that daemon (such as an OBEX, | |
142 | * MTP, or print server) is ready to handle host requests. | |
143 | * | |
144 | * Not all systems support software control of their USB peripheral | |
145 | * data pullups. | |
146 | * | |
147 | * Returns zero on success, else negative errno. | |
148 | */ | |
149 | int usb_function_deactivate(struct usb_function *function) | |
150 | { | |
151 | struct usb_composite_dev *cdev = function->config->cdev; | |
152 | int status = 0; | |
153 | ||
154 | spin_lock(&cdev->lock); | |
155 | ||
156 | if (cdev->deactivations == 0) | |
157 | status = usb_gadget_disconnect(cdev->gadget); | |
158 | if (status == 0) | |
159 | cdev->deactivations++; | |
160 | ||
161 | spin_unlock(&cdev->lock); | |
162 | return status; | |
163 | } | |
164 | ||
165 | /** | |
166 | * usb_function_activate - allow function and gadget enumeration | |
167 | * @function: function on which usb_function_activate() was called | |
168 | * | |
169 | * Reverses effect of usb_function_deactivate(). If no more functions | |
170 | * are delaying their activation, the gadget driver will respond to | |
171 | * host enumeration procedures. | |
172 | * | |
173 | * Returns zero on success, else negative errno. | |
174 | */ | |
175 | int usb_function_activate(struct usb_function *function) | |
176 | { | |
177 | struct usb_composite_dev *cdev = function->config->cdev; | |
178 | int status = 0; | |
179 | ||
180 | spin_lock(&cdev->lock); | |
181 | ||
182 | if (WARN_ON(cdev->deactivations == 0)) | |
183 | status = -EINVAL; | |
184 | else { | |
185 | cdev->deactivations--; | |
186 | if (cdev->deactivations == 0) | |
187 | status = usb_gadget_connect(cdev->gadget); | |
188 | } | |
189 | ||
190 | spin_unlock(&cdev->lock); | |
191 | return status; | |
192 | } | |
193 | ||
40982be5 DB |
194 | /** |
195 | * usb_interface_id() - allocate an unused interface ID | |
196 | * @config: configuration associated with the interface | |
197 | * @function: function handling the interface | |
198 | * Context: single threaded during gadget setup | |
199 | * | |
200 | * usb_interface_id() is called from usb_function.bind() callbacks to | |
201 | * allocate new interface IDs. The function driver will then store that | |
202 | * ID in interface, association, CDC union, and other descriptors. It | |
203 | * will also handle any control requests targetted at that interface, | |
204 | * particularly changing its altsetting via set_alt(). There may | |
205 | * also be class-specific or vendor-specific requests to handle. | |
206 | * | |
207 | * All interface identifier should be allocated using this routine, to | |
208 | * ensure that for example different functions don't wrongly assign | |
209 | * different meanings to the same identifier. Note that since interface | |
210 | * identifers are configuration-specific, functions used in more than | |
211 | * one configuration (or more than once in a given configuration) need | |
212 | * multiple versions of the relevant descriptors. | |
213 | * | |
214 | * Returns the interface ID which was allocated; or -ENODEV if no | |
215 | * more interface IDs can be allocated. | |
216 | */ | |
217 | int __init usb_interface_id(struct usb_configuration *config, | |
218 | struct usb_function *function) | |
219 | { | |
220 | unsigned id = config->next_interface_id; | |
221 | ||
222 | if (id < MAX_CONFIG_INTERFACES) { | |
223 | config->interface[id] = function; | |
224 | config->next_interface_id = id + 1; | |
225 | return id; | |
226 | } | |
227 | return -ENODEV; | |
228 | } | |
229 | ||
230 | static int config_buf(struct usb_configuration *config, | |
231 | enum usb_device_speed speed, void *buf, u8 type) | |
232 | { | |
233 | struct usb_config_descriptor *c = buf; | |
234 | void *next = buf + USB_DT_CONFIG_SIZE; | |
235 | int len = USB_BUFSIZ - USB_DT_CONFIG_SIZE; | |
236 | struct usb_function *f; | |
237 | int status; | |
238 | ||
239 | /* write the config descriptor */ | |
240 | c = buf; | |
241 | c->bLength = USB_DT_CONFIG_SIZE; | |
242 | c->bDescriptorType = type; | |
243 | /* wTotalLength is written later */ | |
244 | c->bNumInterfaces = config->next_interface_id; | |
245 | c->bConfigurationValue = config->bConfigurationValue; | |
246 | c->iConfiguration = config->iConfiguration; | |
247 | c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes; | |
36e893d2 | 248 | c->bMaxPower = config->bMaxPower ? : (CONFIG_USB_GADGET_VBUS_DRAW / 2); |
40982be5 DB |
249 | |
250 | /* There may be e.g. OTG descriptors */ | |
251 | if (config->descriptors) { | |
252 | status = usb_descriptor_fillbuf(next, len, | |
253 | config->descriptors); | |
254 | if (status < 0) | |
255 | return status; | |
256 | len -= status; | |
257 | next += status; | |
258 | } | |
259 | ||
260 | /* add each function's descriptors */ | |
261 | list_for_each_entry(f, &config->functions, list) { | |
262 | struct usb_descriptor_header **descriptors; | |
263 | ||
264 | if (speed == USB_SPEED_HIGH) | |
265 | descriptors = f->hs_descriptors; | |
266 | else | |
267 | descriptors = f->descriptors; | |
268 | if (!descriptors) | |
269 | continue; | |
270 | status = usb_descriptor_fillbuf(next, len, | |
271 | (const struct usb_descriptor_header **) descriptors); | |
272 | if (status < 0) | |
273 | return status; | |
274 | len -= status; | |
275 | next += status; | |
276 | } | |
277 | ||
278 | len = next - buf; | |
279 | c->wTotalLength = cpu_to_le16(len); | |
280 | return len; | |
281 | } | |
282 | ||
283 | static int config_desc(struct usb_composite_dev *cdev, unsigned w_value) | |
284 | { | |
285 | struct usb_gadget *gadget = cdev->gadget; | |
286 | struct usb_configuration *c; | |
287 | u8 type = w_value >> 8; | |
288 | enum usb_device_speed speed = USB_SPEED_UNKNOWN; | |
289 | ||
290 | if (gadget_is_dualspeed(gadget)) { | |
291 | int hs = 0; | |
292 | ||
293 | if (gadget->speed == USB_SPEED_HIGH) | |
294 | hs = 1; | |
295 | if (type == USB_DT_OTHER_SPEED_CONFIG) | |
296 | hs = !hs; | |
297 | if (hs) | |
298 | speed = USB_SPEED_HIGH; | |
299 | ||
300 | } | |
301 | ||
302 | /* This is a lookup by config *INDEX* */ | |
303 | w_value &= 0xff; | |
304 | list_for_each_entry(c, &cdev->configs, list) { | |
305 | /* ignore configs that won't work at this speed */ | |
306 | if (speed == USB_SPEED_HIGH) { | |
307 | if (!c->highspeed) | |
308 | continue; | |
309 | } else { | |
310 | if (!c->fullspeed) | |
311 | continue; | |
312 | } | |
313 | if (w_value == 0) | |
314 | return config_buf(c, speed, cdev->req->buf, type); | |
315 | w_value--; | |
316 | } | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
320 | static int count_configs(struct usb_composite_dev *cdev, unsigned type) | |
321 | { | |
322 | struct usb_gadget *gadget = cdev->gadget; | |
323 | struct usb_configuration *c; | |
324 | unsigned count = 0; | |
325 | int hs = 0; | |
326 | ||
327 | if (gadget_is_dualspeed(gadget)) { | |
328 | if (gadget->speed == USB_SPEED_HIGH) | |
329 | hs = 1; | |
330 | if (type == USB_DT_DEVICE_QUALIFIER) | |
331 | hs = !hs; | |
332 | } | |
333 | list_for_each_entry(c, &cdev->configs, list) { | |
334 | /* ignore configs that won't work at this speed */ | |
335 | if (hs) { | |
336 | if (!c->highspeed) | |
337 | continue; | |
338 | } else { | |
339 | if (!c->fullspeed) | |
340 | continue; | |
341 | } | |
342 | count++; | |
343 | } | |
344 | return count; | |
345 | } | |
346 | ||
347 | static void device_qual(struct usb_composite_dev *cdev) | |
348 | { | |
349 | struct usb_qualifier_descriptor *qual = cdev->req->buf; | |
350 | ||
351 | qual->bLength = sizeof(*qual); | |
352 | qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER; | |
353 | /* POLICY: same bcdUSB and device type info at both speeds */ | |
354 | qual->bcdUSB = cdev->desc.bcdUSB; | |
355 | qual->bDeviceClass = cdev->desc.bDeviceClass; | |
356 | qual->bDeviceSubClass = cdev->desc.bDeviceSubClass; | |
357 | qual->bDeviceProtocol = cdev->desc.bDeviceProtocol; | |
358 | /* ASSUME same EP0 fifo size at both speeds */ | |
359 | qual->bMaxPacketSize0 = cdev->desc.bMaxPacketSize0; | |
360 | qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER); | |
c24f4227 | 361 | qual->bRESERVED = 0; |
40982be5 DB |
362 | } |
363 | ||
364 | /*-------------------------------------------------------------------------*/ | |
365 | ||
366 | static void reset_config(struct usb_composite_dev *cdev) | |
367 | { | |
368 | struct usb_function *f; | |
369 | ||
370 | DBG(cdev, "reset config\n"); | |
371 | ||
372 | list_for_each_entry(f, &cdev->config->functions, list) { | |
373 | if (f->disable) | |
374 | f->disable(f); | |
375 | } | |
376 | cdev->config = NULL; | |
377 | } | |
378 | ||
379 | static int set_config(struct usb_composite_dev *cdev, | |
380 | const struct usb_ctrlrequest *ctrl, unsigned number) | |
381 | { | |
382 | struct usb_gadget *gadget = cdev->gadget; | |
383 | struct usb_configuration *c = NULL; | |
384 | int result = -EINVAL; | |
385 | unsigned power = gadget_is_otg(gadget) ? 8 : 100; | |
386 | int tmp; | |
387 | ||
388 | if (cdev->config) | |
389 | reset_config(cdev); | |
390 | ||
391 | if (number) { | |
392 | list_for_each_entry(c, &cdev->configs, list) { | |
393 | if (c->bConfigurationValue == number) { | |
394 | result = 0; | |
395 | break; | |
396 | } | |
397 | } | |
398 | if (result < 0) | |
399 | goto done; | |
400 | } else | |
401 | result = 0; | |
402 | ||
403 | INFO(cdev, "%s speed config #%d: %s\n", | |
404 | ({ char *speed; | |
405 | switch (gadget->speed) { | |
406 | case USB_SPEED_LOW: speed = "low"; break; | |
407 | case USB_SPEED_FULL: speed = "full"; break; | |
408 | case USB_SPEED_HIGH: speed = "high"; break; | |
409 | default: speed = "?"; break; | |
410 | } ; speed; }), number, c ? c->label : "unconfigured"); | |
411 | ||
412 | if (!c) | |
413 | goto done; | |
414 | ||
415 | cdev->config = c; | |
416 | ||
417 | /* Initialize all interfaces by setting them to altsetting zero. */ | |
418 | for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) { | |
419 | struct usb_function *f = c->interface[tmp]; | |
420 | ||
421 | if (!f) | |
422 | break; | |
423 | ||
424 | result = f->set_alt(f, tmp, 0); | |
425 | if (result < 0) { | |
426 | DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n", | |
427 | tmp, f->name, f, result); | |
428 | ||
429 | reset_config(cdev); | |
430 | goto done; | |
431 | } | |
432 | } | |
433 | ||
434 | /* when we return, be sure our power usage is valid */ | |
36e893d2 | 435 | power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW; |
40982be5 DB |
436 | done: |
437 | usb_gadget_vbus_draw(gadget, power); | |
438 | return result; | |
439 | } | |
440 | ||
441 | /** | |
442 | * usb_add_config() - add a configuration to a device. | |
443 | * @cdev: wraps the USB gadget | |
444 | * @config: the configuration, with bConfigurationValue assigned | |
445 | * Context: single threaded during gadget setup | |
446 | * | |
447 | * One of the main tasks of a composite driver's bind() routine is to | |
448 | * add each of the configurations it supports, using this routine. | |
449 | * | |
450 | * This function returns the value of the configuration's bind(), which | |
451 | * is zero for success else a negative errno value. Binding configurations | |
452 | * assigns global resources including string IDs, and per-configuration | |
453 | * resources such as interface IDs and endpoints. | |
454 | */ | |
455 | int __init usb_add_config(struct usb_composite_dev *cdev, | |
456 | struct usb_configuration *config) | |
457 | { | |
458 | int status = -EINVAL; | |
459 | struct usb_configuration *c; | |
460 | ||
461 | DBG(cdev, "adding config #%u '%s'/%p\n", | |
462 | config->bConfigurationValue, | |
463 | config->label, config); | |
464 | ||
465 | if (!config->bConfigurationValue || !config->bind) | |
466 | goto done; | |
467 | ||
468 | /* Prevent duplicate configuration identifiers */ | |
469 | list_for_each_entry(c, &cdev->configs, list) { | |
470 | if (c->bConfigurationValue == config->bConfigurationValue) { | |
471 | status = -EBUSY; | |
472 | goto done; | |
473 | } | |
474 | } | |
475 | ||
476 | config->cdev = cdev; | |
477 | list_add_tail(&config->list, &cdev->configs); | |
478 | ||
479 | INIT_LIST_HEAD(&config->functions); | |
480 | config->next_interface_id = 0; | |
481 | ||
482 | status = config->bind(config); | |
483 | if (status < 0) { | |
484 | list_del(&config->list); | |
485 | config->cdev = NULL; | |
486 | } else { | |
487 | unsigned i; | |
488 | ||
489 | DBG(cdev, "cfg %d/%p speeds:%s%s\n", | |
490 | config->bConfigurationValue, config, | |
491 | config->highspeed ? " high" : "", | |
492 | config->fullspeed | |
493 | ? (gadget_is_dualspeed(cdev->gadget) | |
494 | ? " full" | |
495 | : " full/low") | |
496 | : ""); | |
497 | ||
498 | for (i = 0; i < MAX_CONFIG_INTERFACES; i++) { | |
499 | struct usb_function *f = config->interface[i]; | |
500 | ||
501 | if (!f) | |
502 | continue; | |
503 | DBG(cdev, " interface %d = %s/%p\n", | |
504 | i, f->name, f); | |
505 | } | |
506 | } | |
507 | ||
508 | /* set_alt(), or next config->bind(), sets up | |
509 | * ep->driver_data as needed. | |
510 | */ | |
511 | usb_ep_autoconfig_reset(cdev->gadget); | |
512 | ||
513 | done: | |
514 | if (status) | |
515 | DBG(cdev, "added config '%s'/%u --> %d\n", config->label, | |
516 | config->bConfigurationValue, status); | |
517 | return status; | |
518 | } | |
519 | ||
520 | /*-------------------------------------------------------------------------*/ | |
521 | ||
522 | /* We support strings in multiple languages ... string descriptor zero | |
523 | * says which languages are supported. The typical case will be that | |
524 | * only one language (probably English) is used, with I18N handled on | |
525 | * the host side. | |
526 | */ | |
527 | ||
528 | static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf) | |
529 | { | |
530 | const struct usb_gadget_strings *s; | |
531 | u16 language; | |
532 | __le16 *tmp; | |
533 | ||
534 | while (*sp) { | |
535 | s = *sp; | |
536 | language = cpu_to_le16(s->language); | |
537 | for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) { | |
538 | if (*tmp == language) | |
539 | goto repeat; | |
540 | } | |
541 | *tmp++ = language; | |
542 | repeat: | |
543 | sp++; | |
544 | } | |
545 | } | |
546 | ||
547 | static int lookup_string( | |
548 | struct usb_gadget_strings **sp, | |
549 | void *buf, | |
550 | u16 language, | |
551 | int id | |
552 | ) | |
553 | { | |
554 | struct usb_gadget_strings *s; | |
555 | int value; | |
556 | ||
557 | while (*sp) { | |
558 | s = *sp++; | |
559 | if (s->language != language) | |
560 | continue; | |
561 | value = usb_gadget_get_string(s, id, buf); | |
562 | if (value > 0) | |
563 | return value; | |
564 | } | |
565 | return -EINVAL; | |
566 | } | |
567 | ||
568 | static int get_string(struct usb_composite_dev *cdev, | |
569 | void *buf, u16 language, int id) | |
570 | { | |
571 | struct usb_configuration *c; | |
572 | struct usb_function *f; | |
573 | int len; | |
574 | ||
575 | /* Yes, not only is USB's I18N support probably more than most | |
576 | * folk will ever care about ... also, it's all supported here. | |
577 | * (Except for UTF8 support for Unicode's "Astral Planes".) | |
578 | */ | |
579 | ||
580 | /* 0 == report all available language codes */ | |
581 | if (id == 0) { | |
582 | struct usb_string_descriptor *s = buf; | |
583 | struct usb_gadget_strings **sp; | |
584 | ||
585 | memset(s, 0, 256); | |
586 | s->bDescriptorType = USB_DT_STRING; | |
587 | ||
588 | sp = composite->strings; | |
589 | if (sp) | |
590 | collect_langs(sp, s->wData); | |
591 | ||
592 | list_for_each_entry(c, &cdev->configs, list) { | |
593 | sp = c->strings; | |
594 | if (sp) | |
595 | collect_langs(sp, s->wData); | |
596 | ||
597 | list_for_each_entry(f, &c->functions, list) { | |
598 | sp = f->strings; | |
599 | if (sp) | |
600 | collect_langs(sp, s->wData); | |
601 | } | |
602 | } | |
603 | ||
604 | for (len = 0; s->wData[len] && len <= 126; len++) | |
605 | continue; | |
606 | if (!len) | |
607 | return -EINVAL; | |
608 | ||
609 | s->bLength = 2 * (len + 1); | |
610 | return s->bLength; | |
611 | } | |
612 | ||
613 | /* Otherwise, look up and return a specified string. String IDs | |
614 | * are device-scoped, so we look up each string table we're told | |
615 | * about. These lookups are infrequent; simpler-is-better here. | |
616 | */ | |
617 | if (composite->strings) { | |
618 | len = lookup_string(composite->strings, buf, language, id); | |
619 | if (len > 0) | |
620 | return len; | |
621 | } | |
622 | list_for_each_entry(c, &cdev->configs, list) { | |
623 | if (c->strings) { | |
624 | len = lookup_string(c->strings, buf, language, id); | |
625 | if (len > 0) | |
626 | return len; | |
627 | } | |
628 | list_for_each_entry(f, &c->functions, list) { | |
629 | if (!f->strings) | |
630 | continue; | |
631 | len = lookup_string(f->strings, buf, language, id); | |
632 | if (len > 0) | |
633 | return len; | |
634 | } | |
635 | } | |
636 | return -EINVAL; | |
637 | } | |
638 | ||
639 | /** | |
640 | * usb_string_id() - allocate an unused string ID | |
641 | * @cdev: the device whose string descriptor IDs are being allocated | |
642 | * Context: single threaded during gadget setup | |
643 | * | |
644 | * @usb_string_id() is called from bind() callbacks to allocate | |
645 | * string IDs. Drivers for functions, configurations, or gadgets will | |
646 | * then store that ID in the appropriate descriptors and string table. | |
647 | * | |
648 | * All string identifier should be allocated using this routine, to | |
649 | * ensure that for example different functions don't wrongly assign | |
650 | * different meanings to the same identifier. | |
651 | */ | |
652 | int __init usb_string_id(struct usb_composite_dev *cdev) | |
653 | { | |
654 | if (cdev->next_string_id < 254) { | |
655 | /* string id 0 is reserved */ | |
656 | cdev->next_string_id++; | |
657 | return cdev->next_string_id; | |
658 | } | |
659 | return -ENODEV; | |
660 | } | |
661 | ||
662 | /*-------------------------------------------------------------------------*/ | |
663 | ||
664 | static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req) | |
665 | { | |
666 | if (req->status || req->actual != req->length) | |
667 | DBG((struct usb_composite_dev *) ep->driver_data, | |
668 | "setup complete --> %d, %d/%d\n", | |
669 | req->status, req->actual, req->length); | |
670 | } | |
671 | ||
672 | /* | |
673 | * The setup() callback implements all the ep0 functionality that's | |
674 | * not handled lower down, in hardware or the hardware driver(like | |
675 | * device and endpoint feature flags, and their status). It's all | |
676 | * housekeeping for the gadget function we're implementing. Most of | |
677 | * the work is in config and function specific setup. | |
678 | */ | |
679 | static int | |
680 | composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) | |
681 | { | |
682 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
683 | struct usb_request *req = cdev->req; | |
684 | int value = -EOPNOTSUPP; | |
685 | u16 w_index = le16_to_cpu(ctrl->wIndex); | |
686 | u16 w_value = le16_to_cpu(ctrl->wValue); | |
687 | u16 w_length = le16_to_cpu(ctrl->wLength); | |
688 | struct usb_function *f = NULL; | |
689 | ||
690 | /* partial re-init of the response message; the function or the | |
691 | * gadget might need to intercept e.g. a control-OUT completion | |
692 | * when we delegate to it. | |
693 | */ | |
694 | req->zero = 0; | |
695 | req->complete = composite_setup_complete; | |
696 | req->length = USB_BUFSIZ; | |
697 | gadget->ep0->driver_data = cdev; | |
698 | ||
699 | switch (ctrl->bRequest) { | |
700 | ||
701 | /* we handle all standard USB descriptors */ | |
702 | case USB_REQ_GET_DESCRIPTOR: | |
703 | if (ctrl->bRequestType != USB_DIR_IN) | |
704 | goto unknown; | |
705 | switch (w_value >> 8) { | |
706 | ||
707 | case USB_DT_DEVICE: | |
708 | cdev->desc.bNumConfigurations = | |
709 | count_configs(cdev, USB_DT_DEVICE); | |
710 | value = min(w_length, (u16) sizeof cdev->desc); | |
711 | memcpy(req->buf, &cdev->desc, value); | |
712 | break; | |
713 | case USB_DT_DEVICE_QUALIFIER: | |
714 | if (!gadget_is_dualspeed(gadget)) | |
715 | break; | |
716 | device_qual(cdev); | |
717 | value = min_t(int, w_length, | |
718 | sizeof(struct usb_qualifier_descriptor)); | |
719 | break; | |
720 | case USB_DT_OTHER_SPEED_CONFIG: | |
721 | if (!gadget_is_dualspeed(gadget)) | |
722 | break; | |
723 | /* FALLTHROUGH */ | |
724 | case USB_DT_CONFIG: | |
725 | value = config_desc(cdev, w_value); | |
726 | if (value >= 0) | |
727 | value = min(w_length, (u16) value); | |
728 | break; | |
729 | case USB_DT_STRING: | |
730 | value = get_string(cdev, req->buf, | |
731 | w_index, w_value & 0xff); | |
732 | if (value >= 0) | |
733 | value = min(w_length, (u16) value); | |
734 | break; | |
735 | } | |
736 | break; | |
737 | ||
738 | /* any number of configs can work */ | |
739 | case USB_REQ_SET_CONFIGURATION: | |
740 | if (ctrl->bRequestType != 0) | |
741 | goto unknown; | |
742 | if (gadget_is_otg(gadget)) { | |
743 | if (gadget->a_hnp_support) | |
744 | DBG(cdev, "HNP available\n"); | |
745 | else if (gadget->a_alt_hnp_support) | |
746 | DBG(cdev, "HNP on another port\n"); | |
747 | else | |
748 | VDBG(cdev, "HNP inactive\n"); | |
749 | } | |
750 | spin_lock(&cdev->lock); | |
751 | value = set_config(cdev, ctrl, w_value); | |
752 | spin_unlock(&cdev->lock); | |
753 | break; | |
754 | case USB_REQ_GET_CONFIGURATION: | |
755 | if (ctrl->bRequestType != USB_DIR_IN) | |
756 | goto unknown; | |
757 | if (cdev->config) | |
758 | *(u8 *)req->buf = cdev->config->bConfigurationValue; | |
759 | else | |
760 | *(u8 *)req->buf = 0; | |
761 | value = min(w_length, (u16) 1); | |
762 | break; | |
763 | ||
764 | /* function drivers must handle get/set altsetting; if there's | |
765 | * no get() method, we know only altsetting zero works. | |
766 | */ | |
767 | case USB_REQ_SET_INTERFACE: | |
768 | if (ctrl->bRequestType != USB_RECIP_INTERFACE) | |
769 | goto unknown; | |
770 | if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES) | |
771 | break; | |
772 | f = cdev->config->interface[w_index]; | |
773 | if (!f) | |
774 | break; | |
775 | if (w_value && !f->get_alt) | |
776 | break; | |
777 | value = f->set_alt(f, w_index, w_value); | |
778 | break; | |
779 | case USB_REQ_GET_INTERFACE: | |
780 | if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) | |
781 | goto unknown; | |
782 | if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES) | |
783 | break; | |
784 | f = cdev->config->interface[w_index]; | |
785 | if (!f) | |
786 | break; | |
787 | /* lots of interfaces only need altsetting zero... */ | |
788 | value = f->get_alt ? f->get_alt(f, w_index) : 0; | |
789 | if (value < 0) | |
790 | break; | |
791 | *((u8 *)req->buf) = value; | |
792 | value = min(w_length, (u16) 1); | |
793 | break; | |
794 | default: | |
795 | unknown: | |
796 | VDBG(cdev, | |
797 | "non-core control req%02x.%02x v%04x i%04x l%d\n", | |
798 | ctrl->bRequestType, ctrl->bRequest, | |
799 | w_value, w_index, w_length); | |
800 | ||
801 | /* functions always handle their interfaces ... punt other | |
802 | * recipients (endpoint, other, WUSB, ...) to the current | |
803 | * configuration code. | |
804 | * | |
805 | * REVISIT it could make sense to let the composite device | |
806 | * take such requests too, if that's ever needed: to work | |
807 | * in config 0, etc. | |
808 | */ | |
809 | if ((ctrl->bRequestType & USB_RECIP_MASK) | |
810 | == USB_RECIP_INTERFACE) { | |
811 | f = cdev->config->interface[w_index]; | |
812 | if (f && f->setup) | |
813 | value = f->setup(f, ctrl); | |
814 | else | |
815 | f = NULL; | |
816 | } | |
817 | if (value < 0 && !f) { | |
818 | struct usb_configuration *c; | |
819 | ||
820 | c = cdev->config; | |
821 | if (c && c->setup) | |
822 | value = c->setup(c, ctrl); | |
823 | } | |
824 | ||
825 | goto done; | |
826 | } | |
827 | ||
828 | /* respond with data transfer before status phase? */ | |
829 | if (value >= 0) { | |
830 | req->length = value; | |
831 | req->zero = value < w_length; | |
832 | value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); | |
833 | if (value < 0) { | |
834 | DBG(cdev, "ep_queue --> %d\n", value); | |
835 | req->status = 0; | |
836 | composite_setup_complete(gadget->ep0, req); | |
837 | } | |
838 | } | |
839 | ||
840 | done: | |
841 | /* device either stalls (value < 0) or reports success */ | |
842 | return value; | |
843 | } | |
844 | ||
845 | static void composite_disconnect(struct usb_gadget *gadget) | |
846 | { | |
847 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
848 | unsigned long flags; | |
849 | ||
850 | /* REVISIT: should we have config and device level | |
851 | * disconnect callbacks? | |
852 | */ | |
853 | spin_lock_irqsave(&cdev->lock, flags); | |
854 | if (cdev->config) | |
855 | reset_config(cdev); | |
856 | spin_unlock_irqrestore(&cdev->lock, flags); | |
857 | } | |
858 | ||
859 | /*-------------------------------------------------------------------------*/ | |
860 | ||
861 | static void /* __init_or_exit */ | |
862 | composite_unbind(struct usb_gadget *gadget) | |
863 | { | |
864 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
865 | ||
866 | /* composite_disconnect() must already have been called | |
867 | * by the underlying peripheral controller driver! | |
868 | * so there's no i/o concurrency that could affect the | |
869 | * state protected by cdev->lock. | |
870 | */ | |
871 | WARN_ON(cdev->config); | |
872 | ||
873 | while (!list_empty(&cdev->configs)) { | |
874 | struct usb_configuration *c; | |
875 | ||
876 | c = list_first_entry(&cdev->configs, | |
877 | struct usb_configuration, list); | |
878 | while (!list_empty(&c->functions)) { | |
879 | struct usb_function *f; | |
880 | ||
881 | f = list_first_entry(&c->functions, | |
882 | struct usb_function, list); | |
883 | list_del(&f->list); | |
884 | if (f->unbind) { | |
885 | DBG(cdev, "unbind function '%s'/%p\n", | |
886 | f->name, f); | |
887 | f->unbind(c, f); | |
888 | /* may free memory for "f" */ | |
889 | } | |
890 | } | |
891 | list_del(&c->list); | |
892 | if (c->unbind) { | |
893 | DBG(cdev, "unbind config '%s'/%p\n", c->label, c); | |
894 | c->unbind(c); | |
895 | /* may free memory for "c" */ | |
896 | } | |
897 | } | |
898 | if (composite->unbind) | |
899 | composite->unbind(cdev); | |
900 | ||
901 | if (cdev->req) { | |
902 | kfree(cdev->req->buf); | |
903 | usb_ep_free_request(gadget->ep0, cdev->req); | |
904 | } | |
905 | kfree(cdev); | |
906 | set_gadget_data(gadget, NULL); | |
907 | composite = NULL; | |
908 | } | |
909 | ||
910 | static void __init | |
911 | string_override_one(struct usb_gadget_strings *tab, u8 id, const char *s) | |
912 | { | |
913 | struct usb_string *str = tab->strings; | |
914 | ||
915 | for (str = tab->strings; str->s; str++) { | |
916 | if (str->id == id) { | |
917 | str->s = s; | |
918 | return; | |
919 | } | |
920 | } | |
921 | } | |
922 | ||
923 | static void __init | |
924 | string_override(struct usb_gadget_strings **tab, u8 id, const char *s) | |
925 | { | |
926 | while (*tab) { | |
927 | string_override_one(*tab, id, s); | |
928 | tab++; | |
929 | } | |
930 | } | |
931 | ||
932 | static int __init composite_bind(struct usb_gadget *gadget) | |
933 | { | |
934 | struct usb_composite_dev *cdev; | |
935 | int status = -ENOMEM; | |
936 | ||
937 | cdev = kzalloc(sizeof *cdev, GFP_KERNEL); | |
938 | if (!cdev) | |
939 | return status; | |
940 | ||
941 | spin_lock_init(&cdev->lock); | |
942 | cdev->gadget = gadget; | |
943 | set_gadget_data(gadget, cdev); | |
944 | INIT_LIST_HEAD(&cdev->configs); | |
945 | ||
946 | /* preallocate control response and buffer */ | |
947 | cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); | |
948 | if (!cdev->req) | |
949 | goto fail; | |
950 | cdev->req->buf = kmalloc(USB_BUFSIZ, GFP_KERNEL); | |
951 | if (!cdev->req->buf) | |
952 | goto fail; | |
953 | cdev->req->complete = composite_setup_complete; | |
954 | gadget->ep0->driver_data = cdev; | |
955 | ||
956 | cdev->bufsiz = USB_BUFSIZ; | |
957 | cdev->driver = composite; | |
958 | ||
959 | usb_gadget_set_selfpowered(gadget); | |
960 | ||
961 | /* interface and string IDs start at zero via kzalloc. | |
962 | * we force endpoints to start unassigned; few controller | |
963 | * drivers will zero ep->driver_data. | |
964 | */ | |
965 | usb_ep_autoconfig_reset(cdev->gadget); | |
966 | ||
967 | /* composite gadget needs to assign strings for whole device (like | |
968 | * serial number), register function drivers, potentially update | |
969 | * power state and consumption, etc | |
970 | */ | |
971 | status = composite->bind(cdev); | |
972 | if (status < 0) | |
973 | goto fail; | |
974 | ||
975 | cdev->desc = *composite->dev; | |
976 | cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket; | |
977 | ||
978 | /* standardized runtime overrides for device ID data */ | |
979 | if (idVendor) | |
980 | cdev->desc.idVendor = cpu_to_le16(idVendor); | |
981 | if (idProduct) | |
982 | cdev->desc.idProduct = cpu_to_le16(idProduct); | |
983 | if (bcdDevice) | |
984 | cdev->desc.bcdDevice = cpu_to_le16(bcdDevice); | |
985 | ||
986 | /* strings can't be assigned before bind() allocates the | |
987 | * releavnt identifiers | |
988 | */ | |
989 | if (cdev->desc.iManufacturer && iManufacturer) | |
990 | string_override(composite->strings, | |
991 | cdev->desc.iManufacturer, iManufacturer); | |
992 | if (cdev->desc.iProduct && iProduct) | |
993 | string_override(composite->strings, | |
994 | cdev->desc.iProduct, iProduct); | |
995 | if (cdev->desc.iSerialNumber && iSerialNumber) | |
996 | string_override(composite->strings, | |
997 | cdev->desc.iSerialNumber, iSerialNumber); | |
998 | ||
999 | INFO(cdev, "%s ready\n", composite->name); | |
1000 | return 0; | |
1001 | ||
1002 | fail: | |
1003 | composite_unbind(gadget); | |
1004 | return status; | |
1005 | } | |
1006 | ||
1007 | /*-------------------------------------------------------------------------*/ | |
1008 | ||
1009 | static void | |
1010 | composite_suspend(struct usb_gadget *gadget) | |
1011 | { | |
1012 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1013 | struct usb_function *f; | |
1014 | ||
1015 | /* REVISIT: should we have config and device level | |
1016 | * suspend/resume callbacks? | |
1017 | */ | |
1018 | DBG(cdev, "suspend\n"); | |
1019 | if (cdev->config) { | |
1020 | list_for_each_entry(f, &cdev->config->functions, list) { | |
1021 | if (f->suspend) | |
1022 | f->suspend(f); | |
1023 | } | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | static void | |
1028 | composite_resume(struct usb_gadget *gadget) | |
1029 | { | |
1030 | struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1031 | struct usb_function *f; | |
1032 | ||
1033 | /* REVISIT: should we have config and device level | |
1034 | * suspend/resume callbacks? | |
1035 | */ | |
1036 | DBG(cdev, "resume\n"); | |
1037 | if (cdev->config) { | |
1038 | list_for_each_entry(f, &cdev->config->functions, list) { | |
1039 | if (f->resume) | |
1040 | f->resume(f); | |
1041 | } | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | /*-------------------------------------------------------------------------*/ | |
1046 | ||
1047 | static struct usb_gadget_driver composite_driver = { | |
1048 | .speed = USB_SPEED_HIGH, | |
1049 | ||
1050 | .bind = composite_bind, | |
1051 | .unbind = __exit_p(composite_unbind), | |
1052 | ||
1053 | .setup = composite_setup, | |
1054 | .disconnect = composite_disconnect, | |
1055 | ||
1056 | .suspend = composite_suspend, | |
1057 | .resume = composite_resume, | |
1058 | ||
1059 | .driver = { | |
1060 | .owner = THIS_MODULE, | |
1061 | }, | |
1062 | }; | |
1063 | ||
1064 | /** | |
1065 | * usb_composite_register() - register a composite driver | |
1066 | * @driver: the driver to register | |
1067 | * Context: single threaded during gadget setup | |
1068 | * | |
1069 | * This function is used to register drivers using the composite driver | |
1070 | * framework. The return value is zero, or a negative errno value. | |
1071 | * Those values normally come from the driver's @bind method, which does | |
1072 | * all the work of setting up the driver to match the hardware. | |
1073 | * | |
1074 | * On successful return, the gadget is ready to respond to requests from | |
1075 | * the host, unless one of its components invokes usb_gadget_disconnect() | |
1076 | * while it was binding. That would usually be done in order to wait for | |
1077 | * some userspace participation. | |
1078 | */ | |
1079 | int __init usb_composite_register(struct usb_composite_driver *driver) | |
1080 | { | |
1081 | if (!driver || !driver->dev || !driver->bind || composite) | |
1082 | return -EINVAL; | |
1083 | ||
1084 | if (!driver->name) | |
1085 | driver->name = "composite"; | |
1086 | composite_driver.function = (char *) driver->name; | |
1087 | composite_driver.driver.name = driver->name; | |
1088 | composite = driver; | |
1089 | ||
1090 | return usb_gadget_register_driver(&composite_driver); | |
1091 | } | |
1092 | ||
1093 | /** | |
1094 | * usb_composite_unregister() - unregister a composite driver | |
1095 | * @driver: the driver to unregister | |
1096 | * | |
1097 | * This function is used to unregister drivers using the composite | |
1098 | * driver framework. | |
1099 | */ | |
1100 | void __exit usb_composite_unregister(struct usb_composite_driver *driver) | |
1101 | { | |
1102 | if (composite != driver) | |
1103 | return; | |
1104 | usb_gadget_unregister_driver(&composite_driver); | |
1105 | } |