Commit 7010f5b94fa3c8e5daf95d4fab002eddbfa4e9b2
Committed by
Marek Vasut
1 parent
f3b05ca533
Exists in
master
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54 other branches
usb:gadget:composite USB composite gadget support
USB Composite gadget implementation for u-boot. It builds on top of USB UDC drivers. This commit is based on following files from Linux Kernel v2.6.36: ./include/linux/usb/composite.h ./drivers/usb/gadget/composite.c SHA1: d187abb9a83e6c6b6e9f2ca17962bdeafb4bc903 Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: Marek Vasut <marex@denx.de>
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drivers/usb/gadget/composite.c
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1 | +/* | |
2 | + * composite.c - infrastructure for Composite USB Gadgets | |
3 | + * | |
4 | + * Copyright (C) 2006-2008 David Brownell | |
5 | + * U-boot porting: Lukasz Majewski <l.majewski@samsung.com> | |
6 | + * | |
7 | + * This program is free software; you can redistribute it and/or modify | |
8 | + * it under the terms of the GNU General Public License as published by | |
9 | + * the Free Software Foundation; either version 2 of the License, or | |
10 | + * (at your option) any later version. | |
11 | + * | |
12 | + * This program is distributed in the hope that it will be useful, | |
13 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | + * GNU General Public License for more details. | |
16 | + * | |
17 | + * You should have received a copy of the GNU General Public License | |
18 | + * along with this program; if not, write to the Free Software | |
19 | + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | + */ | |
21 | +#undef DEBUG | |
22 | + | |
23 | +#include <linux/bitops.h> | |
24 | +#include <linux/usb/composite.h> | |
25 | + | |
26 | +#define USB_BUFSIZ 4096 | |
27 | + | |
28 | +static struct usb_composite_driver *composite; | |
29 | + | |
30 | +/** | |
31 | + * usb_add_function() - add a function to a configuration | |
32 | + * @config: the configuration | |
33 | + * @function: the function being added | |
34 | + * Context: single threaded during gadget setup | |
35 | + * | |
36 | + * After initialization, each configuration must have one or more | |
37 | + * functions added to it. Adding a function involves calling its @bind() | |
38 | + * method to allocate resources such as interface and string identifiers | |
39 | + * and endpoints. | |
40 | + * | |
41 | + * This function returns the value of the function's bind(), which is | |
42 | + * zero for success else a negative errno value. | |
43 | + */ | |
44 | +int usb_add_function(struct usb_configuration *config, | |
45 | + struct usb_function *function) | |
46 | +{ | |
47 | + int value = -EINVAL; | |
48 | + | |
49 | + debug("adding '%s'/%p to config '%s'/%p\n", | |
50 | + function->name, function, | |
51 | + config->label, config); | |
52 | + | |
53 | + if (!function->set_alt || !function->disable) | |
54 | + goto done; | |
55 | + | |
56 | + function->config = config; | |
57 | + list_add_tail(&function->list, &config->functions); | |
58 | + | |
59 | + if (function->bind) { | |
60 | + value = function->bind(config, function); | |
61 | + if (value < 0) { | |
62 | + list_del(&function->list); | |
63 | + function->config = NULL; | |
64 | + } | |
65 | + } else | |
66 | + value = 0; | |
67 | + | |
68 | + if (!config->fullspeed && function->descriptors) | |
69 | + config->fullspeed = 1; | |
70 | + if (!config->highspeed && function->hs_descriptors) | |
71 | + config->highspeed = 1; | |
72 | + | |
73 | +done: | |
74 | + if (value) | |
75 | + debug("adding '%s'/%p --> %d\n", | |
76 | + function->name, function, value); | |
77 | + return value; | |
78 | +} | |
79 | + | |
80 | +/** | |
81 | + * usb_function_deactivate - prevent function and gadget enumeration | |
82 | + * @function: the function that isn't yet ready to respond | |
83 | + * | |
84 | + * Blocks response of the gadget driver to host enumeration by | |
85 | + * preventing the data line pullup from being activated. This is | |
86 | + * normally called during @bind() processing to change from the | |
87 | + * initial "ready to respond" state, or when a required resource | |
88 | + * becomes available. | |
89 | + * | |
90 | + * For example, drivers that serve as a passthrough to a userspace | |
91 | + * daemon can block enumeration unless that daemon (such as an OBEX, | |
92 | + * MTP, or print server) is ready to handle host requests. | |
93 | + * | |
94 | + * Not all systems support software control of their USB peripheral | |
95 | + * data pullups. | |
96 | + * | |
97 | + * Returns zero on success, else negative errno. | |
98 | + */ | |
99 | +int usb_function_deactivate(struct usb_function *function) | |
100 | +{ | |
101 | + struct usb_composite_dev *cdev = function->config->cdev; | |
102 | + int status = 0; | |
103 | + | |
104 | + if (cdev->deactivations == 0) | |
105 | + status = usb_gadget_disconnect(cdev->gadget); | |
106 | + if (status == 0) | |
107 | + cdev->deactivations++; | |
108 | + | |
109 | + return status; | |
110 | +} | |
111 | + | |
112 | +/** | |
113 | + * usb_function_activate - allow function and gadget enumeration | |
114 | + * @function: function on which usb_function_activate() was called | |
115 | + * | |
116 | + * Reverses effect of usb_function_deactivate(). If no more functions | |
117 | + * are delaying their activation, the gadget driver will respond to | |
118 | + * host enumeration procedures. | |
119 | + * | |
120 | + * Returns zero on success, else negative errno. | |
121 | + */ | |
122 | +int usb_function_activate(struct usb_function *function) | |
123 | +{ | |
124 | + struct usb_composite_dev *cdev = function->config->cdev; | |
125 | + int status = 0; | |
126 | + | |
127 | + if (cdev->deactivations == 0) | |
128 | + status = -EINVAL; | |
129 | + else { | |
130 | + cdev->deactivations--; | |
131 | + if (cdev->deactivations == 0) | |
132 | + status = usb_gadget_connect(cdev->gadget); | |
133 | + } | |
134 | + | |
135 | + return status; | |
136 | +} | |
137 | + | |
138 | +/** | |
139 | + * usb_interface_id() - allocate an unused interface ID | |
140 | + * @config: configuration associated with the interface | |
141 | + * @function: function handling the interface | |
142 | + * Context: single threaded during gadget setup | |
143 | + * | |
144 | + * usb_interface_id() is called from usb_function.bind() callbacks to | |
145 | + * allocate new interface IDs. The function driver will then store that | |
146 | + * ID in interface, association, CDC union, and other descriptors. It | |
147 | + * will also handle any control requests targetted at that interface, | |
148 | + * particularly changing its altsetting via set_alt(). There may | |
149 | + * also be class-specific or vendor-specific requests to handle. | |
150 | + * | |
151 | + * All interface identifier should be allocated using this routine, to | |
152 | + * ensure that for example different functions don't wrongly assign | |
153 | + * different meanings to the same identifier. Note that since interface | |
154 | + * identifers are configuration-specific, functions used in more than | |
155 | + * one configuration (or more than once in a given configuration) need | |
156 | + * multiple versions of the relevant descriptors. | |
157 | + * | |
158 | + * Returns the interface ID which was allocated; or -ENODEV if no | |
159 | + * more interface IDs can be allocated. | |
160 | + */ | |
161 | +int usb_interface_id(struct usb_configuration *config, | |
162 | + struct usb_function *function) | |
163 | +{ | |
164 | + unsigned char id = config->next_interface_id; | |
165 | + | |
166 | + if (id < MAX_CONFIG_INTERFACES) { | |
167 | + config->interface[id] = function; | |
168 | + config->next_interface_id = id + 1; | |
169 | + return id; | |
170 | + } | |
171 | + return -ENODEV; | |
172 | +} | |
173 | + | |
174 | +static int config_buf(struct usb_configuration *config, | |
175 | + enum usb_device_speed speed, void *buf, u8 type) | |
176 | +{ | |
177 | + int len = USB_BUFSIZ - USB_DT_CONFIG_SIZE; | |
178 | + void *next = buf + USB_DT_CONFIG_SIZE; | |
179 | + struct usb_descriptor_header **descriptors; | |
180 | + struct usb_config_descriptor *c = buf; | |
181 | + int status; | |
182 | + struct usb_function *f; | |
183 | + | |
184 | + /* write the config descriptor */ | |
185 | + c = buf; | |
186 | + c->bLength = USB_DT_CONFIG_SIZE; | |
187 | + c->bDescriptorType = type; | |
188 | + | |
189 | + c->bNumInterfaces = config->next_interface_id; | |
190 | + c->bConfigurationValue = config->bConfigurationValue; | |
191 | + c->iConfiguration = config->iConfiguration; | |
192 | + c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes; | |
193 | + c->bMaxPower = config->bMaxPower ? : (CONFIG_USB_GADGET_VBUS_DRAW / 2); | |
194 | + | |
195 | + /* There may be e.g. OTG descriptors */ | |
196 | + if (config->descriptors) { | |
197 | + status = usb_descriptor_fillbuf(next, len, | |
198 | + config->descriptors); | |
199 | + if (status < 0) | |
200 | + return status; | |
201 | + len -= status; | |
202 | + next += status; | |
203 | + } | |
204 | + | |
205 | + /* add each function's descriptors */ | |
206 | + list_for_each_entry(f, &config->functions, list) { | |
207 | + if (speed == USB_SPEED_HIGH) | |
208 | + descriptors = f->hs_descriptors; | |
209 | + else | |
210 | + descriptors = f->descriptors; | |
211 | + if (!descriptors) | |
212 | + continue; | |
213 | + status = usb_descriptor_fillbuf(next, len, | |
214 | + (const struct usb_descriptor_header **) descriptors); | |
215 | + if (status < 0) | |
216 | + return status; | |
217 | + len -= status; | |
218 | + next += status; | |
219 | + } | |
220 | + | |
221 | + len = next - buf; | |
222 | + c->wTotalLength = cpu_to_le16(len); | |
223 | + return len; | |
224 | +} | |
225 | + | |
226 | +static int config_desc(struct usb_composite_dev *cdev, unsigned w_value) | |
227 | +{ | |
228 | + enum usb_device_speed speed = USB_SPEED_UNKNOWN; | |
229 | + struct usb_gadget *gadget = cdev->gadget; | |
230 | + u8 type = w_value >> 8; | |
231 | + int hs = 0; | |
232 | + struct usb_configuration *c; | |
233 | + | |
234 | + if (gadget_is_dualspeed(gadget)) { | |
235 | + if (gadget->speed == USB_SPEED_HIGH) | |
236 | + hs = 1; | |
237 | + if (type == USB_DT_OTHER_SPEED_CONFIG) | |
238 | + hs = !hs; | |
239 | + if (hs) | |
240 | + speed = USB_SPEED_HIGH; | |
241 | + } | |
242 | + | |
243 | + w_value &= 0xff; | |
244 | + list_for_each_entry(c, &cdev->configs, list) { | |
245 | + if (speed == USB_SPEED_HIGH) { | |
246 | + if (!c->highspeed) | |
247 | + continue; | |
248 | + } else { | |
249 | + if (!c->fullspeed) | |
250 | + continue; | |
251 | + } | |
252 | + if (w_value == 0) | |
253 | + return config_buf(c, speed, cdev->req->buf, type); | |
254 | + w_value--; | |
255 | + } | |
256 | + return -EINVAL; | |
257 | +} | |
258 | + | |
259 | +static int count_configs(struct usb_composite_dev *cdev, unsigned type) | |
260 | +{ | |
261 | + struct usb_gadget *gadget = cdev->gadget; | |
262 | + unsigned count = 0; | |
263 | + int hs = 0; | |
264 | + struct usb_configuration *c; | |
265 | + | |
266 | + if (gadget_is_dualspeed(gadget)) { | |
267 | + if (gadget->speed == USB_SPEED_HIGH) | |
268 | + hs = 1; | |
269 | + if (type == USB_DT_DEVICE_QUALIFIER) | |
270 | + hs = !hs; | |
271 | + } | |
272 | + list_for_each_entry(c, &cdev->configs, list) { | |
273 | + /* ignore configs that won't work at this speed */ | |
274 | + if (hs) { | |
275 | + if (!c->highspeed) | |
276 | + continue; | |
277 | + } else { | |
278 | + if (!c->fullspeed) | |
279 | + continue; | |
280 | + } | |
281 | + count++; | |
282 | + } | |
283 | + return count; | |
284 | +} | |
285 | + | |
286 | +static void device_qual(struct usb_composite_dev *cdev) | |
287 | +{ | |
288 | + struct usb_qualifier_descriptor *qual = cdev->req->buf; | |
289 | + | |
290 | + qual->bLength = sizeof(*qual); | |
291 | + qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER; | |
292 | + /* POLICY: same bcdUSB and device type info at both speeds */ | |
293 | + qual->bcdUSB = cdev->desc.bcdUSB; | |
294 | + qual->bDeviceClass = cdev->desc.bDeviceClass; | |
295 | + qual->bDeviceSubClass = cdev->desc.bDeviceSubClass; | |
296 | + qual->bDeviceProtocol = cdev->desc.bDeviceProtocol; | |
297 | + /* ASSUME same EP0 fifo size at both speeds */ | |
298 | + qual->bMaxPacketSize0 = cdev->desc.bMaxPacketSize0; | |
299 | + qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER); | |
300 | + qual->bRESERVED = 0; | |
301 | +} | |
302 | + | |
303 | +static void reset_config(struct usb_composite_dev *cdev) | |
304 | +{ | |
305 | + struct usb_function *f; | |
306 | + | |
307 | + debug("%s:\n", __func__); | |
308 | + | |
309 | + list_for_each_entry(f, &cdev->config->functions, list) { | |
310 | + if (f->disable) | |
311 | + f->disable(f); | |
312 | + | |
313 | + bitmap_zero(f->endpoints, 32); | |
314 | + } | |
315 | + cdev->config = NULL; | |
316 | +} | |
317 | + | |
318 | +static int set_config(struct usb_composite_dev *cdev, | |
319 | + const struct usb_ctrlrequest *ctrl, unsigned number) | |
320 | +{ | |
321 | + struct usb_gadget *gadget = cdev->gadget; | |
322 | + unsigned power = gadget_is_otg(gadget) ? 8 : 100; | |
323 | + struct usb_descriptor_header **descriptors; | |
324 | + int result = -EINVAL; | |
325 | + struct usb_endpoint_descriptor *ep; | |
326 | + struct usb_configuration *c = NULL; | |
327 | + int addr; | |
328 | + int tmp; | |
329 | + struct usb_function *f; | |
330 | + | |
331 | + if (cdev->config) | |
332 | + reset_config(cdev); | |
333 | + | |
334 | + if (number) { | |
335 | + list_for_each_entry(c, &cdev->configs, list) { | |
336 | + if (c->bConfigurationValue == number) { | |
337 | + result = 0; | |
338 | + break; | |
339 | + } | |
340 | + } | |
341 | + if (result < 0) | |
342 | + goto done; | |
343 | + } else | |
344 | + result = 0; | |
345 | + | |
346 | + debug("%s: %s speed config #%d: %s\n", __func__, | |
347 | + ({ char *speed; | |
348 | + switch (gadget->speed) { | |
349 | + case USB_SPEED_LOW: | |
350 | + speed = "low"; | |
351 | + break; | |
352 | + case USB_SPEED_FULL: | |
353 | + speed = "full"; | |
354 | + break; | |
355 | + case USB_SPEED_HIGH: | |
356 | + speed = "high"; | |
357 | + break; | |
358 | + default: | |
359 | + speed = "?"; | |
360 | + break; | |
361 | + }; | |
362 | + speed; | |
363 | + }), number, c ? c->label : "unconfigured"); | |
364 | + | |
365 | + if (!c) | |
366 | + goto done; | |
367 | + | |
368 | + cdev->config = c; | |
369 | + | |
370 | + /* Initialize all interfaces by setting them to altsetting zero. */ | |
371 | + for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) { | |
372 | + f = c->interface[tmp]; | |
373 | + if (!f) | |
374 | + break; | |
375 | + | |
376 | + /* | |
377 | + * Record which endpoints are used by the function. This is used | |
378 | + * to dispatch control requests targeted at that endpoint to the | |
379 | + * function's setup callback instead of the current | |
380 | + * configuration's setup callback. | |
381 | + */ | |
382 | + if (gadget->speed == USB_SPEED_HIGH) | |
383 | + descriptors = f->hs_descriptors; | |
384 | + else | |
385 | + descriptors = f->descriptors; | |
386 | + | |
387 | + for (; *descriptors; ++descriptors) { | |
388 | + if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT) | |
389 | + continue; | |
390 | + | |
391 | + ep = (struct usb_endpoint_descriptor *)*descriptors; | |
392 | + addr = ((ep->bEndpointAddress & 0x80) >> 3) | |
393 | + | (ep->bEndpointAddress & 0x0f); | |
394 | + __set_bit(addr, f->endpoints); | |
395 | + } | |
396 | + | |
397 | + result = f->set_alt(f, tmp, 0); | |
398 | + if (result < 0) { | |
399 | + debug("interface %d (%s/%p) alt 0 --> %d\n", | |
400 | + tmp, f->name, f, result); | |
401 | + | |
402 | + reset_config(cdev); | |
403 | + goto done; | |
404 | + } | |
405 | + } | |
406 | + | |
407 | + /* when we return, be sure our power usage is valid */ | |
408 | + power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW; | |
409 | +done: | |
410 | + usb_gadget_vbus_draw(gadget, power); | |
411 | + return result; | |
412 | +} | |
413 | + | |
414 | +/** | |
415 | + * usb_add_config() - add a configuration to a device. | |
416 | + * @cdev: wraps the USB gadget | |
417 | + * @config: the configuration, with bConfigurationValue assigned | |
418 | + * Context: single threaded during gadget setup | |
419 | + * | |
420 | + * One of the main tasks of a composite driver's bind() routine is to | |
421 | + * add each of the configurations it supports, using this routine. | |
422 | + * | |
423 | + * This function returns the value of the configuration's bind(), which | |
424 | + * is zero for success else a negative errno value. Binding configurations | |
425 | + * assigns global resources including string IDs, and per-configuration | |
426 | + * resources such as interface IDs and endpoints. | |
427 | + */ | |
428 | +int usb_add_config(struct usb_composite_dev *cdev, | |
429 | + struct usb_configuration *config) | |
430 | +{ | |
431 | + int status = -EINVAL; | |
432 | + struct usb_configuration *c; | |
433 | + struct usb_function *f; | |
434 | + unsigned int i; | |
435 | + | |
436 | + debug("%s: adding config #%u '%s'/%p\n", __func__, | |
437 | + config->bConfigurationValue, | |
438 | + config->label, config); | |
439 | + | |
440 | + if (!config->bConfigurationValue || !config->bind) | |
441 | + goto done; | |
442 | + | |
443 | + /* Prevent duplicate configuration identifiers */ | |
444 | + list_for_each_entry(c, &cdev->configs, list) { | |
445 | + if (c->bConfigurationValue == config->bConfigurationValue) { | |
446 | + status = -EBUSY; | |
447 | + goto done; | |
448 | + } | |
449 | + } | |
450 | + | |
451 | + config->cdev = cdev; | |
452 | + list_add_tail(&config->list, &cdev->configs); | |
453 | + | |
454 | + INIT_LIST_HEAD(&config->functions); | |
455 | + config->next_interface_id = 0; | |
456 | + | |
457 | + status = config->bind(config); | |
458 | + if (status < 0) { | |
459 | + list_del(&config->list); | |
460 | + config->cdev = NULL; | |
461 | + } else { | |
462 | + debug("cfg %d/%p speeds:%s%s\n", | |
463 | + config->bConfigurationValue, config, | |
464 | + config->highspeed ? " high" : "", | |
465 | + config->fullspeed | |
466 | + ? (gadget_is_dualspeed(cdev->gadget) | |
467 | + ? " full" | |
468 | + : " full/low") | |
469 | + : ""); | |
470 | + | |
471 | + for (i = 0; i < MAX_CONFIG_INTERFACES; i++) { | |
472 | + f = config->interface[i]; | |
473 | + if (!f) | |
474 | + continue; | |
475 | + debug("%s: interface %d = %s/%p\n", | |
476 | + __func__, i, f->name, f); | |
477 | + } | |
478 | + } | |
479 | + | |
480 | + usb_ep_autoconfig_reset(cdev->gadget); | |
481 | + | |
482 | +done: | |
483 | + if (status) | |
484 | + debug("added config '%s'/%u --> %d\n", config->label, | |
485 | + config->bConfigurationValue, status); | |
486 | + return status; | |
487 | +} | |
488 | + | |
489 | +/* | |
490 | + * We support strings in multiple languages ... string descriptor zero | |
491 | + * says which languages are supported. The typical case will be that | |
492 | + * only one language (probably English) is used, with I18N handled on | |
493 | + * the host side. | |
494 | + */ | |
495 | + | |
496 | +static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf) | |
497 | +{ | |
498 | + const struct usb_gadget_strings *s; | |
499 | + u16 language; | |
500 | + __le16 *tmp; | |
501 | + | |
502 | + while (*sp) { | |
503 | + s = *sp; | |
504 | + language = cpu_to_le16(s->language); | |
505 | + for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) { | |
506 | + if (*tmp == language) | |
507 | + goto repeat; | |
508 | + } | |
509 | + *tmp++ = language; | |
510 | +repeat: | |
511 | + sp++; | |
512 | + } | |
513 | +} | |
514 | + | |
515 | +static int lookup_string( | |
516 | + struct usb_gadget_strings **sp, | |
517 | + void *buf, | |
518 | + u16 language, | |
519 | + int id | |
520 | +) | |
521 | +{ | |
522 | + int value; | |
523 | + struct usb_gadget_strings *s; | |
524 | + | |
525 | + while (*sp) { | |
526 | + s = *sp++; | |
527 | + if (s->language != language) | |
528 | + continue; | |
529 | + value = usb_gadget_get_string(s, id, buf); | |
530 | + if (value > 0) | |
531 | + return value; | |
532 | + } | |
533 | + return -EINVAL; | |
534 | +} | |
535 | + | |
536 | +static int get_string(struct usb_composite_dev *cdev, | |
537 | + void *buf, u16 language, int id) | |
538 | +{ | |
539 | + struct usb_string_descriptor *s = buf; | |
540 | + struct usb_gadget_strings **sp; | |
541 | + int len; | |
542 | + struct usb_configuration *c; | |
543 | + struct usb_function *f; | |
544 | + | |
545 | + /* | |
546 | + * Yes, not only is USB's I18N support probably more than most | |
547 | + * folk will ever care about ... also, it's all supported here. | |
548 | + * (Except for UTF8 support for Unicode's "Astral Planes".) | |
549 | + */ | |
550 | + | |
551 | + /* 0 == report all available language codes */ | |
552 | + if (id == 0) { | |
553 | + memset(s, 0, 256); | |
554 | + s->bDescriptorType = USB_DT_STRING; | |
555 | + | |
556 | + sp = composite->strings; | |
557 | + if (sp) | |
558 | + collect_langs(sp, s->wData); | |
559 | + | |
560 | + list_for_each_entry(c, &cdev->configs, list) { | |
561 | + sp = c->strings; | |
562 | + if (sp) | |
563 | + collect_langs(sp, s->wData); | |
564 | + | |
565 | + list_for_each_entry(f, &c->functions, list) { | |
566 | + sp = f->strings; | |
567 | + if (sp) | |
568 | + collect_langs(sp, s->wData); | |
569 | + } | |
570 | + } | |
571 | + | |
572 | + for (len = 0; len <= 126 && s->wData[len]; len++) | |
573 | + continue; | |
574 | + if (!len) | |
575 | + return -EINVAL; | |
576 | + | |
577 | + s->bLength = 2 * (len + 1); | |
578 | + return s->bLength; | |
579 | + } | |
580 | + | |
581 | + /* | |
582 | + * Otherwise, look up and return a specified string. String IDs | |
583 | + * are device-scoped, so we look up each string table we're told | |
584 | + * about. These lookups are infrequent; simpler-is-better here. | |
585 | + */ | |
586 | + if (composite->strings) { | |
587 | + len = lookup_string(composite->strings, buf, language, id); | |
588 | + if (len > 0) | |
589 | + return len; | |
590 | + } | |
591 | + list_for_each_entry(c, &cdev->configs, list) { | |
592 | + if (c->strings) { | |
593 | + len = lookup_string(c->strings, buf, language, id); | |
594 | + if (len > 0) | |
595 | + return len; | |
596 | + } | |
597 | + list_for_each_entry(f, &c->functions, list) { | |
598 | + if (!f->strings) | |
599 | + continue; | |
600 | + len = lookup_string(f->strings, buf, language, id); | |
601 | + if (len > 0) | |
602 | + return len; | |
603 | + } | |
604 | + } | |
605 | + return -EINVAL; | |
606 | +} | |
607 | + | |
608 | +/** | |
609 | + * usb_string_id() - allocate an unused string ID | |
610 | + * @cdev: the device whose string descriptor IDs are being allocated | |
611 | + * Context: single threaded during gadget setup | |
612 | + * | |
613 | + * @usb_string_id() is called from bind() callbacks to allocate | |
614 | + * string IDs. Drivers for functions, configurations, or gadgets will | |
615 | + * then store that ID in the appropriate descriptors and string table. | |
616 | + * | |
617 | + * All string identifier should be allocated using this, | |
618 | + * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure | |
619 | + * that for example different functions don't wrongly assign different | |
620 | + * meanings to the same identifier. | |
621 | + */ | |
622 | +int usb_string_id(struct usb_composite_dev *cdev) | |
623 | +{ | |
624 | + if (cdev->next_string_id < 254) { | |
625 | + /* | |
626 | + * string id 0 is reserved by USB spec for list of | |
627 | + * supported languages | |
628 | + * 255 reserved as well? -- mina86 | |
629 | + */ | |
630 | + cdev->next_string_id++; | |
631 | + return cdev->next_string_id; | |
632 | + } | |
633 | + return -ENODEV; | |
634 | +} | |
635 | + | |
636 | +/** | |
637 | + * usb_string_ids() - allocate unused string IDs in batch | |
638 | + * @cdev: the device whose string descriptor IDs are being allocated | |
639 | + * @str: an array of usb_string objects to assign numbers to | |
640 | + * Context: single threaded during gadget setup | |
641 | + * | |
642 | + * @usb_string_ids() is called from bind() callbacks to allocate | |
643 | + * string IDs. Drivers for functions, configurations, or gadgets will | |
644 | + * then copy IDs from the string table to the appropriate descriptors | |
645 | + * and string table for other languages. | |
646 | + * | |
647 | + * All string identifier should be allocated using this, | |
648 | + * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for | |
649 | + * example different functions don't wrongly assign different meanings | |
650 | + * to the same identifier. | |
651 | + */ | |
652 | +int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str) | |
653 | +{ | |
654 | + u8 next = cdev->next_string_id; | |
655 | + | |
656 | + for (; str->s; ++str) { | |
657 | + if (next >= 254) | |
658 | + return -ENODEV; | |
659 | + str->id = ++next; | |
660 | + } | |
661 | + | |
662 | + cdev->next_string_id = next; | |
663 | + | |
664 | + return 0; | |
665 | +} | |
666 | + | |
667 | +/** | |
668 | + * usb_string_ids_n() - allocate unused string IDs in batch | |
669 | + * @c: the device whose string descriptor IDs are being allocated | |
670 | + * @n: number of string IDs to allocate | |
671 | + * Context: single threaded during gadget setup | |
672 | + * | |
673 | + * Returns the first requested ID. This ID and next @n-1 IDs are now | |
674 | + * valid IDs. At least provided that @n is non-zero because if it | |
675 | + * is, returns last requested ID which is now very useful information. | |
676 | + * | |
677 | + * @usb_string_ids_n() is called from bind() callbacks to allocate | |
678 | + * string IDs. Drivers for functions, configurations, or gadgets will | |
679 | + * then store that ID in the appropriate descriptors and string table. | |
680 | + * | |
681 | + * All string identifier should be allocated using this, | |
682 | + * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for | |
683 | + * example different functions don't wrongly assign different meanings | |
684 | + * to the same identifier. | |
685 | + */ | |
686 | +int usb_string_ids_n(struct usb_composite_dev *c, unsigned n) | |
687 | +{ | |
688 | + u8 next = c->next_string_id; | |
689 | + | |
690 | + if (n > 254 || next + n > 254) | |
691 | + return -ENODEV; | |
692 | + | |
693 | + c->next_string_id += n; | |
694 | + return next + 1; | |
695 | +} | |
696 | + | |
697 | +static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req) | |
698 | +{ | |
699 | + if (req->status || req->actual != req->length) | |
700 | + debug("%s: setup complete --> %d, %d/%d\n", __func__, | |
701 | + req->status, req->actual, req->length); | |
702 | +} | |
703 | + | |
704 | +/* | |
705 | + * The setup() callback implements all the ep0 functionality that's | |
706 | + * not handled lower down, in hardware or the hardware driver(like | |
707 | + * device and endpoint feature flags, and their status). It's all | |
708 | + * housekeeping for the gadget function we're implementing. Most of | |
709 | + * the work is in config and function specific setup. | |
710 | + */ | |
711 | +static int | |
712 | +composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) | |
713 | +{ | |
714 | + u16 w_length = le16_to_cpu(ctrl->wLength); | |
715 | + u16 w_index = le16_to_cpu(ctrl->wIndex); | |
716 | + u16 w_value = le16_to_cpu(ctrl->wValue); | |
717 | + struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
718 | + u8 intf = w_index & 0xFF; | |
719 | + int value = -EOPNOTSUPP; | |
720 | + struct usb_request *req = cdev->req; | |
721 | + struct usb_function *f = NULL; | |
722 | + int standard; | |
723 | + u8 endp; | |
724 | + struct usb_configuration *c; | |
725 | + | |
726 | + /* | |
727 | + * partial re-init of the response message; the function or the | |
728 | + * gadget might need to intercept e.g. a control-OUT completion | |
729 | + * when we delegate to it. | |
730 | + */ | |
731 | + req->zero = 0; | |
732 | + req->complete = composite_setup_complete; | |
733 | + req->length = USB_BUFSIZ; | |
734 | + gadget->ep0->driver_data = cdev; | |
735 | + standard = (ctrl->bRequestType & USB_TYPE_MASK) | |
736 | + == USB_TYPE_STANDARD; | |
737 | + if (!standard) | |
738 | + goto unknown; | |
739 | + | |
740 | + switch (ctrl->bRequest) { | |
741 | + | |
742 | + /* we handle all standard USB descriptors */ | |
743 | + case USB_REQ_GET_DESCRIPTOR: | |
744 | + if (ctrl->bRequestType != USB_DIR_IN) | |
745 | + goto unknown; | |
746 | + switch (w_value >> 8) { | |
747 | + | |
748 | + case USB_DT_DEVICE: | |
749 | + cdev->desc.bNumConfigurations = | |
750 | + count_configs(cdev, USB_DT_DEVICE); | |
751 | + value = min(w_length, (u16) sizeof cdev->desc); | |
752 | + memcpy(req->buf, &cdev->desc, value); | |
753 | + break; | |
754 | + case USB_DT_DEVICE_QUALIFIER: | |
755 | + if (!gadget_is_dualspeed(gadget)) | |
756 | + break; | |
757 | + device_qual(cdev); | |
758 | + value = min(w_length, | |
759 | + sizeof(struct usb_qualifier_descriptor)); | |
760 | + break; | |
761 | + case USB_DT_OTHER_SPEED_CONFIG: | |
762 | + if (!gadget_is_dualspeed(gadget)) | |
763 | + break; | |
764 | + | |
765 | + case USB_DT_CONFIG: | |
766 | + value = config_desc(cdev, w_value); | |
767 | + if (value >= 0) | |
768 | + value = min(w_length, (u16) value); | |
769 | + break; | |
770 | + case USB_DT_STRING: | |
771 | + value = get_string(cdev, req->buf, | |
772 | + w_index, w_value & 0xff); | |
773 | + if (value >= 0) | |
774 | + value = min(w_length, (u16) value); | |
775 | + break; | |
776 | + default: | |
777 | + goto unknown; | |
778 | + } | |
779 | + break; | |
780 | + | |
781 | + /* any number of configs can work */ | |
782 | + case USB_REQ_SET_CONFIGURATION: | |
783 | + if (ctrl->bRequestType != 0) | |
784 | + goto unknown; | |
785 | + if (gadget_is_otg(gadget)) { | |
786 | + if (gadget->a_hnp_support) | |
787 | + debug("HNP available\n"); | |
788 | + else if (gadget->a_alt_hnp_support) | |
789 | + debug("HNP on another port\n"); | |
790 | + else | |
791 | + debug("HNP inactive\n"); | |
792 | + } | |
793 | + | |
794 | + value = set_config(cdev, ctrl, w_value); | |
795 | + break; | |
796 | + case USB_REQ_GET_CONFIGURATION: | |
797 | + if (ctrl->bRequestType != USB_DIR_IN) | |
798 | + goto unknown; | |
799 | + if (cdev->config) | |
800 | + *(u8 *)req->buf = cdev->config->bConfigurationValue; | |
801 | + else | |
802 | + *(u8 *)req->buf = 0; | |
803 | + value = min(w_length, (u16) 1); | |
804 | + break; | |
805 | + | |
806 | + /* | |
807 | + * function drivers must handle get/set altsetting; if there's | |
808 | + * no get() method, we know only altsetting zero works. | |
809 | + */ | |
810 | + case USB_REQ_SET_INTERFACE: | |
811 | + if (ctrl->bRequestType != USB_RECIP_INTERFACE) | |
812 | + goto unknown; | |
813 | + if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES) | |
814 | + break; | |
815 | + f = cdev->config->interface[intf]; | |
816 | + if (!f) | |
817 | + break; | |
818 | + if (w_value && !f->set_alt) | |
819 | + break; | |
820 | + value = f->set_alt(f, w_index, w_value); | |
821 | + break; | |
822 | + case USB_REQ_GET_INTERFACE: | |
823 | + if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) | |
824 | + goto unknown; | |
825 | + if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES) | |
826 | + break; | |
827 | + f = cdev->config->interface[intf]; | |
828 | + if (!f) | |
829 | + break; | |
830 | + /* lots of interfaces only need altsetting zero... */ | |
831 | + value = f->get_alt ? f->get_alt(f, w_index) : 0; | |
832 | + if (value < 0) | |
833 | + break; | |
834 | + *((u8 *)req->buf) = value; | |
835 | + value = min(w_length, (u16) 1); | |
836 | + break; | |
837 | + default: | |
838 | +unknown: | |
839 | + debug("non-core control req%02x.%02x v%04x i%04x l%d\n", | |
840 | + ctrl->bRequestType, ctrl->bRequest, | |
841 | + w_value, w_index, w_length); | |
842 | + | |
843 | + /* | |
844 | + * functions always handle their interfaces and endpoints... | |
845 | + * punt other recipients (other, WUSB, ...) to the current | |
846 | + * configuration code. | |
847 | + */ | |
848 | + switch (ctrl->bRequestType & USB_RECIP_MASK) { | |
849 | + case USB_RECIP_INTERFACE: | |
850 | + f = cdev->config->interface[intf]; | |
851 | + break; | |
852 | + | |
853 | + case USB_RECIP_ENDPOINT: | |
854 | + endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f); | |
855 | + list_for_each_entry(f, &cdev->config->functions, list) { | |
856 | + if (test_bit(endp, f->endpoints)) | |
857 | + break; | |
858 | + } | |
859 | + if (&f->list == &cdev->config->functions) | |
860 | + f = NULL; | |
861 | + break; | |
862 | + } | |
863 | + | |
864 | + if (f && f->setup) | |
865 | + value = f->setup(f, ctrl); | |
866 | + else { | |
867 | + c = cdev->config; | |
868 | + if (c && c->setup) | |
869 | + value = c->setup(c, ctrl); | |
870 | + } | |
871 | + | |
872 | + goto done; | |
873 | + } | |
874 | + | |
875 | + /* respond with data transfer before status phase? */ | |
876 | + if (value >= 0) { | |
877 | + req->length = value; | |
878 | + req->zero = value < w_length; | |
879 | + value = usb_ep_queue(gadget->ep0, req, GFP_KERNEL); | |
880 | + if (value < 0) { | |
881 | + debug("ep_queue --> %d\n", value); | |
882 | + req->status = 0; | |
883 | + composite_setup_complete(gadget->ep0, req); | |
884 | + } | |
885 | + } | |
886 | + | |
887 | +done: | |
888 | + /* device either stalls (value < 0) or reports success */ | |
889 | + return value; | |
890 | +} | |
891 | + | |
892 | +static void composite_disconnect(struct usb_gadget *gadget) | |
893 | +{ | |
894 | + struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
895 | + | |
896 | + if (cdev->config) | |
897 | + reset_config(cdev); | |
898 | + if (composite->disconnect) | |
899 | + composite->disconnect(cdev); | |
900 | +} | |
901 | + | |
902 | +static void composite_unbind(struct usb_gadget *gadget) | |
903 | +{ | |
904 | + struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
905 | + struct usb_configuration *c; | |
906 | + struct usb_function *f; | |
907 | + | |
908 | + /* | |
909 | + * composite_disconnect() must already have been called | |
910 | + * by the underlying peripheral controller driver! | |
911 | + * so there's no i/o concurrency that could affect the | |
912 | + * state protected by cdev->lock. | |
913 | + */ | |
914 | + BUG_ON(cdev->config); | |
915 | + | |
916 | + while (!list_empty(&cdev->configs)) { | |
917 | + c = list_first_entry(&cdev->configs, | |
918 | + struct usb_configuration, list); | |
919 | + while (!list_empty(&c->functions)) { | |
920 | + f = list_first_entry(&c->functions, | |
921 | + struct usb_function, list); | |
922 | + list_del(&f->list); | |
923 | + if (f->unbind) { | |
924 | + debug("unbind function '%s'/%p\n", | |
925 | + f->name, f); | |
926 | + f->unbind(c, f); | |
927 | + } | |
928 | + } | |
929 | + list_del(&c->list); | |
930 | + if (c->unbind) { | |
931 | + debug("unbind config '%s'/%p\n", c->label, c); | |
932 | + c->unbind(c); | |
933 | + } | |
934 | + } | |
935 | + if (composite->unbind) | |
936 | + composite->unbind(cdev); | |
937 | + | |
938 | + if (cdev->req) { | |
939 | + kfree(cdev->req->buf); | |
940 | + usb_ep_free_request(gadget->ep0, cdev->req); | |
941 | + } | |
942 | + kfree(cdev); | |
943 | + set_gadget_data(gadget, NULL); | |
944 | + | |
945 | + composite = NULL; | |
946 | +} | |
947 | + | |
948 | +static int composite_bind(struct usb_gadget *gadget) | |
949 | +{ | |
950 | + int status = -ENOMEM; | |
951 | + struct usb_composite_dev *cdev; | |
952 | + | |
953 | + cdev = calloc(sizeof *cdev, 1); | |
954 | + if (!cdev) | |
955 | + return status; | |
956 | + | |
957 | + cdev->gadget = gadget; | |
958 | + set_gadget_data(gadget, cdev); | |
959 | + INIT_LIST_HEAD(&cdev->configs); | |
960 | + | |
961 | + /* preallocate control response and buffer */ | |
962 | + cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); | |
963 | + if (!cdev->req) | |
964 | + goto fail; | |
965 | + cdev->req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, USB_BUFSIZ); | |
966 | + if (!cdev->req->buf) | |
967 | + goto fail; | |
968 | + cdev->req->complete = composite_setup_complete; | |
969 | + gadget->ep0->driver_data = cdev; | |
970 | + | |
971 | + cdev->bufsiz = USB_BUFSIZ; | |
972 | + cdev->driver = composite; | |
973 | + | |
974 | + usb_gadget_set_selfpowered(gadget); | |
975 | + usb_ep_autoconfig_reset(cdev->gadget); | |
976 | + | |
977 | + status = composite->bind(cdev); | |
978 | + if (status < 0) | |
979 | + goto fail; | |
980 | + | |
981 | + cdev->desc = *composite->dev; | |
982 | + cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket; | |
983 | + | |
984 | + debug("%s: ready\n", composite->name); | |
985 | + return 0; | |
986 | + | |
987 | +fail: | |
988 | + composite_unbind(gadget); | |
989 | + return status; | |
990 | +} | |
991 | + | |
992 | +static void | |
993 | +composite_suspend(struct usb_gadget *gadget) | |
994 | +{ | |
995 | + struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
996 | + struct usb_function *f; | |
997 | + | |
998 | + debug("%s: suspend\n", __func__); | |
999 | + if (cdev->config) { | |
1000 | + list_for_each_entry(f, &cdev->config->functions, list) { | |
1001 | + if (f->suspend) | |
1002 | + f->suspend(f); | |
1003 | + } | |
1004 | + } | |
1005 | + if (composite->suspend) | |
1006 | + composite->suspend(cdev); | |
1007 | + | |
1008 | + cdev->suspended = 1; | |
1009 | +} | |
1010 | + | |
1011 | +static void | |
1012 | +composite_resume(struct usb_gadget *gadget) | |
1013 | +{ | |
1014 | + struct usb_composite_dev *cdev = get_gadget_data(gadget); | |
1015 | + struct usb_function *f; | |
1016 | + | |
1017 | + debug("%s: resume\n", __func__); | |
1018 | + if (composite->resume) | |
1019 | + composite->resume(cdev); | |
1020 | + if (cdev->config) { | |
1021 | + list_for_each_entry(f, &cdev->config->functions, list) { | |
1022 | + if (f->resume) | |
1023 | + f->resume(f); | |
1024 | + } | |
1025 | + } | |
1026 | + | |
1027 | + cdev->suspended = 0; | |
1028 | +} | |
1029 | + | |
1030 | +static struct usb_gadget_driver composite_driver = { | |
1031 | + .speed = USB_SPEED_HIGH, | |
1032 | + | |
1033 | + .bind = composite_bind, | |
1034 | + .unbind = composite_unbind, | |
1035 | + | |
1036 | + .setup = composite_setup, | |
1037 | + .disconnect = composite_disconnect, | |
1038 | + | |
1039 | + .suspend = composite_suspend, | |
1040 | + .resume = composite_resume, | |
1041 | +}; | |
1042 | + | |
1043 | +/** | |
1044 | + * usb_composite_register() - register a composite driver | |
1045 | + * @driver: the driver to register | |
1046 | + * Context: single threaded during gadget setup | |
1047 | + * | |
1048 | + * This function is used to register drivers using the composite driver | |
1049 | + * framework. The return value is zero, or a negative errno value. | |
1050 | + * Those values normally come from the driver's @bind method, which does | |
1051 | + * all the work of setting up the driver to match the hardware. | |
1052 | + * | |
1053 | + * On successful return, the gadget is ready to respond to requests from | |
1054 | + * the host, unless one of its components invokes usb_gadget_disconnect() | |
1055 | + * while it was binding. That would usually be done in order to wait for | |
1056 | + * some userspace participation. | |
1057 | + */ | |
1058 | +int usb_composite_register(struct usb_composite_driver *driver) | |
1059 | +{ | |
1060 | + if (!driver || !driver->dev || !driver->bind || composite) | |
1061 | + return -EINVAL; | |
1062 | + | |
1063 | + if (!driver->name) | |
1064 | + driver->name = "composite"; | |
1065 | + composite = driver; | |
1066 | + | |
1067 | + return usb_gadget_register_driver(&composite_driver); | |
1068 | +} | |
1069 | + | |
1070 | +/** | |
1071 | + * usb_composite_unregister() - unregister a composite driver | |
1072 | + * @driver: the driver to unregister | |
1073 | + * | |
1074 | + * This function is used to unregister drivers using the composite | |
1075 | + * driver framework. | |
1076 | + */ | |
1077 | +void usb_composite_unregister(struct usb_composite_driver *driver) | |
1078 | +{ | |
1079 | + if (composite != driver) | |
1080 | + return; | |
1081 | + usb_gadget_unregister_driver(&composite_driver); | |
1082 | +} |
include/linux/usb/composite.h
1 | +/* | |
2 | + * composite.h -- framework for usb gadgets which are composite devices | |
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | + */ | |
20 | + | |
21 | +#ifndef __LINUX_USB_COMPOSITE_H | |
22 | +#define __LINUX_USB_COMPOSITE_H | |
23 | + | |
24 | +/* | |
25 | + * This framework is an optional layer on top of the USB Gadget interface, | |
26 | + * making it easier to build (a) Composite devices, supporting multiple | |
27 | + * functions within any single configuration, and (b) Multi-configuration | |
28 | + * devices, also supporting multiple functions but without necessarily | |
29 | + * having more than one function per configuration. | |
30 | + * | |
31 | + * Example: a device with a single configuration supporting both network | |
32 | + * link and mass storage functions is a composite device. Those functions | |
33 | + * might alternatively be packaged in individual configurations, but in | |
34 | + * the composite model the host can use both functions at the same time. | |
35 | + */ | |
36 | + | |
37 | +#include <common.h> | |
38 | +#include <linux/usb/ch9.h> | |
39 | +#include <linux/usb/gadget.h> | |
40 | +#include <usb/lin_gadget_compat.h> | |
41 | + | |
42 | +struct usb_configuration; | |
43 | + | |
44 | +/** | |
45 | + * struct usb_function - describes one function of a configuration | |
46 | + * @name: For diagnostics, identifies the function. | |
47 | + * @strings: tables of strings, keyed by identifiers assigned during bind() | |
48 | + * and by language IDs provided in control requests | |
49 | + * @descriptors: Table of full (or low) speed descriptors, using interface and | |
50 | + * string identifiers assigned during @bind(). If this pointer is null, | |
51 | + * the function will not be available at full speed (or at low speed). | |
52 | + * @hs_descriptors: Table of high speed descriptors, using interface and | |
53 | + * string identifiers assigned during @bind(). If this pointer is null, | |
54 | + * the function will not be available at high speed. | |
55 | + * @config: assigned when @usb_add_function() is called; this is the | |
56 | + * configuration with which this function is associated. | |
57 | + * @bind: Before the gadget can register, all of its functions bind() to the | |
58 | + * available resources including string and interface identifiers used | |
59 | + * in interface or class descriptors; endpoints; I/O buffers; and so on. | |
60 | + * @unbind: Reverses @bind; called as a side effect of unregistering the | |
61 | + * driver which added this function. | |
62 | + * @set_alt: (REQUIRED) Reconfigures altsettings; function drivers may | |
63 | + * initialize usb_ep.driver data at this time (when it is used). | |
64 | + * Note that setting an interface to its current altsetting resets | |
65 | + * interface state, and that all interfaces have a disabled state. | |
66 | + * @get_alt: Returns the active altsetting. If this is not provided, | |
67 | + * then only altsetting zero is supported. | |
68 | + * @disable: (REQUIRED) Indicates the function should be disabled. Reasons | |
69 | + * include host resetting or reconfiguring the gadget, and disconnection. | |
70 | + * @setup: Used for interface-specific control requests. | |
71 | + * @suspend: Notifies functions when the host stops sending USB traffic. | |
72 | + * @resume: Notifies functions when the host restarts USB traffic. | |
73 | + * | |
74 | + * A single USB function uses one or more interfaces, and should in most | |
75 | + * cases support operation at both full and high speeds. Each function is | |
76 | + * associated by @usb_add_function() with a one configuration; that function | |
77 | + * causes @bind() to be called so resources can be allocated as part of | |
78 | + * setting up a gadget driver. Those resources include endpoints, which | |
79 | + * should be allocated using @usb_ep_autoconfig(). | |
80 | + * | |
81 | + * To support dual speed operation, a function driver provides descriptors | |
82 | + * for both high and full speed operation. Except in rare cases that don't | |
83 | + * involve bulk endpoints, each speed needs different endpoint descriptors. | |
84 | + * | |
85 | + * Function drivers choose their own strategies for managing instance data. | |
86 | + * The simplest strategy just declares it "static', which means the function | |
87 | + * can only be activated once. If the function needs to be exposed in more | |
88 | + * than one configuration at a given speed, it needs to support multiple | |
89 | + * usb_function structures (one for each configuration). | |
90 | + * | |
91 | + * A more complex strategy might encapsulate a @usb_function structure inside | |
92 | + * a driver-specific instance structure to allows multiple activations. An | |
93 | + * example of multiple activations might be a CDC ACM function that supports | |
94 | + * two or more distinct instances within the same configuration, providing | |
95 | + * several independent logical data links to a USB host. | |
96 | + */ | |
97 | +struct usb_function { | |
98 | + const char *name; | |
99 | + struct usb_gadget_strings **strings; | |
100 | + struct usb_descriptor_header **descriptors; | |
101 | + struct usb_descriptor_header **hs_descriptors; | |
102 | + | |
103 | + struct usb_configuration *config; | |
104 | + | |
105 | + /* REVISIT: bind() functions can be marked __init, which | |
106 | + * makes trouble for section mismatch analysis. See if | |
107 | + * we can't restructure things to avoid mismatching. | |
108 | + * Related: unbind() may kfree() but bind() won't... | |
109 | + */ | |
110 | + | |
111 | + /* configuration management: bind/unbind */ | |
112 | + int (*bind)(struct usb_configuration *, | |
113 | + struct usb_function *); | |
114 | + void (*unbind)(struct usb_configuration *, | |
115 | + struct usb_function *); | |
116 | + | |
117 | + /* runtime state management */ | |
118 | + int (*set_alt)(struct usb_function *, | |
119 | + unsigned interface, unsigned alt); | |
120 | + int (*get_alt)(struct usb_function *, | |
121 | + unsigned interface); | |
122 | + void (*disable)(struct usb_function *); | |
123 | + int (*setup)(struct usb_function *, | |
124 | + const struct usb_ctrlrequest *); | |
125 | + void (*suspend)(struct usb_function *); | |
126 | + void (*resume)(struct usb_function *); | |
127 | + | |
128 | + /* private: */ | |
129 | + /* internals */ | |
130 | + struct list_head list; | |
131 | + DECLARE_BITMAP(endpoints, 32); | |
132 | +}; | |
133 | + | |
134 | +int usb_add_function(struct usb_configuration *, struct usb_function *); | |
135 | + | |
136 | +int usb_function_deactivate(struct usb_function *); | |
137 | +int usb_function_activate(struct usb_function *); | |
138 | + | |
139 | +int usb_interface_id(struct usb_configuration *, struct usb_function *); | |
140 | + | |
141 | +/** | |
142 | + * ep_choose - select descriptor endpoint at current device speed | |
143 | + * @g: gadget, connected and running at some speed | |
144 | + * @hs: descriptor to use for high speed operation | |
145 | + * @fs: descriptor to use for full or low speed operation | |
146 | + */ | |
147 | +static inline struct usb_endpoint_descriptor * | |
148 | +ep_choose(struct usb_gadget *g, struct usb_endpoint_descriptor *hs, | |
149 | + struct usb_endpoint_descriptor *fs) | |
150 | +{ | |
151 | + if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) | |
152 | + return hs; | |
153 | + return fs; | |
154 | +} | |
155 | + | |
156 | +#define MAX_CONFIG_INTERFACES 16 /* arbitrary; max 255 */ | |
157 | + | |
158 | +/** | |
159 | + * struct usb_configuration - represents one gadget configuration | |
160 | + * @label: For diagnostics, describes the configuration. | |
161 | + * @strings: Tables of strings, keyed by identifiers assigned during @bind() | |
162 | + * and by language IDs provided in control requests. | |
163 | + * @descriptors: Table of descriptors preceding all function descriptors. | |
164 | + * Examples include OTG and vendor-specific descriptors. | |
165 | + * @bind: Called from @usb_add_config() to allocate resources unique to this | |
166 | + * configuration and to call @usb_add_function() for each function used. | |
167 | + * @unbind: Reverses @bind; called as a side effect of unregistering the | |
168 | + * driver which added this configuration. | |
169 | + * @setup: Used to delegate control requests that aren't handled by standard | |
170 | + * device infrastructure or directed at a specific interface. | |
171 | + * @bConfigurationValue: Copied into configuration descriptor. | |
172 | + * @iConfiguration: Copied into configuration descriptor. | |
173 | + * @bmAttributes: Copied into configuration descriptor. | |
174 | + * @bMaxPower: Copied into configuration descriptor. | |
175 | + * @cdev: assigned by @usb_add_config() before calling @bind(); this is | |
176 | + * the device associated with this configuration. | |
177 | + * | |
178 | + * Configurations are building blocks for gadget drivers structured around | |
179 | + * function drivers. Simple USB gadgets require only one function and one | |
180 | + * configuration, and handle dual-speed hardware by always providing the same | |
181 | + * functionality. Slightly more complex gadgets may have more than one | |
182 | + * single-function configuration at a given speed; or have configurations | |
183 | + * that only work at one speed. | |
184 | + * | |
185 | + * Composite devices are, by definition, ones with configurations which | |
186 | + * include more than one function. | |
187 | + * | |
188 | + * The lifecycle of a usb_configuration includes allocation, initialization | |
189 | + * of the fields described above, and calling @usb_add_config() to set up | |
190 | + * internal data and bind it to a specific device. The configuration's | |
191 | + * @bind() method is then used to initialize all the functions and then | |
192 | + * call @usb_add_function() for them. | |
193 | + * | |
194 | + * Those functions would normally be independant of each other, but that's | |
195 | + * not mandatory. CDC WMC devices are an example where functions often | |
196 | + * depend on other functions, with some functions subsidiary to others. | |
197 | + * Such interdependency may be managed in any way, so long as all of the | |
198 | + * descriptors complete by the time the composite driver returns from | |
199 | + * its bind() routine. | |
200 | + */ | |
201 | +struct usb_configuration { | |
202 | + const char *label; | |
203 | + struct usb_gadget_strings **strings; | |
204 | + const struct usb_descriptor_header **descriptors; | |
205 | + | |
206 | + /* REVISIT: bind() functions can be marked __init, which | |
207 | + * makes trouble for section mismatch analysis. See if | |
208 | + * we can't restructure things to avoid mismatching... | |
209 | + */ | |
210 | + | |
211 | + /* configuration management: bind/unbind */ | |
212 | + int (*bind)(struct usb_configuration *); | |
213 | + void (*unbind)(struct usb_configuration *); | |
214 | + int (*setup)(struct usb_configuration *, | |
215 | + const struct usb_ctrlrequest *); | |
216 | + | |
217 | + /* fields in the config descriptor */ | |
218 | + u8 bConfigurationValue; | |
219 | + u8 iConfiguration; | |
220 | + u8 bmAttributes; | |
221 | + u8 bMaxPower; | |
222 | + | |
223 | + struct usb_composite_dev *cdev; | |
224 | + | |
225 | + /* private: */ | |
226 | + /* internals */ | |
227 | + struct list_head list; | |
228 | + struct list_head functions; | |
229 | + u8 next_interface_id; | |
230 | + unsigned highspeed:1; | |
231 | + unsigned fullspeed:1; | |
232 | + struct usb_function *interface[MAX_CONFIG_INTERFACES]; | |
233 | +}; | |
234 | + | |
235 | +int usb_add_config(struct usb_composite_dev *, | |
236 | + struct usb_configuration *); | |
237 | + | |
238 | +/** | |
239 | + * struct usb_composite_driver - groups configurations into a gadget | |
240 | + * @name: For diagnostics, identifies the driver. | |
241 | + * @dev: Template descriptor for the device, including default device | |
242 | + * identifiers. | |
243 | + * @strings: tables of strings, keyed by identifiers assigned during bind() | |
244 | + * and language IDs provided in control requests | |
245 | + * @bind: (REQUIRED) Used to allocate resources that are shared across the | |
246 | + * whole device, such as string IDs, and add its configurations using | |
247 | + * @usb_add_config(). This may fail by returning a negative errno | |
248 | + * value; it should return zero on successful initialization. | |
249 | + * @unbind: Reverses @bind(); called as a side effect of unregistering | |
250 | + * this driver. | |
251 | + * @disconnect: optional driver disconnect method | |
252 | + * @suspend: Notifies when the host stops sending USB traffic, | |
253 | + * after function notifications | |
254 | + * @resume: Notifies configuration when the host restarts USB traffic, | |
255 | + * before function notifications | |
256 | + * | |
257 | + * Devices default to reporting self powered operation. Devices which rely | |
258 | + * on bus powered operation should report this in their @bind() method. | |
259 | + * | |
260 | + * Before returning from @bind, various fields in the template descriptor | |
261 | + * may be overridden. These include the idVendor/idProduct/bcdDevice values | |
262 | + * normally to bind the appropriate host side driver, and the three strings | |
263 | + * (iManufacturer, iProduct, iSerialNumber) normally used to provide user | |
264 | + * meaningful device identifiers. (The strings will not be defined unless | |
265 | + * they are defined in @dev and @strings.) The correct ep0 maxpacket size | |
266 | + * is also reported, as defined by the underlying controller driver. | |
267 | + */ | |
268 | +struct usb_composite_driver { | |
269 | + const char *name; | |
270 | + const struct usb_device_descriptor *dev; | |
271 | + struct usb_gadget_strings **strings; | |
272 | + | |
273 | + /* REVISIT: bind() functions can be marked __init, which | |
274 | + * makes trouble for section mismatch analysis. See if | |
275 | + * we can't restructure things to avoid mismatching... | |
276 | + */ | |
277 | + | |
278 | + int (*bind)(struct usb_composite_dev *); | |
279 | + int (*unbind)(struct usb_composite_dev *); | |
280 | + | |
281 | + void (*disconnect)(struct usb_composite_dev *); | |
282 | + | |
283 | + /* global suspend hooks */ | |
284 | + void (*suspend)(struct usb_composite_dev *); | |
285 | + void (*resume)(struct usb_composite_dev *); | |
286 | +}; | |
287 | + | |
288 | +extern int usb_composite_register(struct usb_composite_driver *); | |
289 | +extern void usb_composite_unregister(struct usb_composite_driver *); | |
290 | + | |
291 | + | |
292 | +/** | |
293 | + * struct usb_composite_device - represents one composite usb gadget | |
294 | + * @gadget: read-only, abstracts the gadget's usb peripheral controller | |
295 | + * @req: used for control responses; buffer is pre-allocated | |
296 | + * @bufsiz: size of buffer pre-allocated in @req | |
297 | + * @config: the currently active configuration | |
298 | + * | |
299 | + * One of these devices is allocated and initialized before the | |
300 | + * associated device driver's bind() is called. | |
301 | + * | |
302 | + * OPEN ISSUE: it appears that some WUSB devices will need to be | |
303 | + * built by combining a normal (wired) gadget with a wireless one. | |
304 | + * This revision of the gadget framework should probably try to make | |
305 | + * sure doing that won't hurt too much. | |
306 | + * | |
307 | + * One notion for how to handle Wireless USB devices involves: | |
308 | + * (a) a second gadget here, discovery mechanism TBD, but likely | |
309 | + * needing separate "register/unregister WUSB gadget" calls; | |
310 | + * (b) updates to usb_gadget to include flags "is it wireless", | |
311 | + * "is it wired", plus (presumably in a wrapper structure) | |
312 | + * bandgroup and PHY info; | |
313 | + * (c) presumably a wireless_ep wrapping a usb_ep, and reporting | |
314 | + * wireless-specific parameters like maxburst and maxsequence; | |
315 | + * (d) configurations that are specific to wireless links; | |
316 | + * (e) function drivers that understand wireless configs and will | |
317 | + * support wireless for (additional) function instances; | |
318 | + * (f) a function to support association setup (like CBAF), not | |
319 | + * necessarily requiring a wireless adapter; | |
320 | + * (g) composite device setup that can create one or more wireless | |
321 | + * configs, including appropriate association setup support; | |
322 | + * (h) more, TBD. | |
323 | + */ | |
324 | +struct usb_composite_dev { | |
325 | + struct usb_gadget *gadget; | |
326 | + struct usb_request *req; | |
327 | + unsigned bufsiz; | |
328 | + | |
329 | + struct usb_configuration *config; | |
330 | + | |
331 | + /* private: */ | |
332 | + /* internals */ | |
333 | + unsigned int suspended:1; | |
334 | + struct usb_device_descriptor desc; | |
335 | + struct list_head configs; | |
336 | + struct usb_composite_driver *driver; | |
337 | + u8 next_string_id; | |
338 | + | |
339 | + /* the gadget driver won't enable the data pullup | |
340 | + * while the deactivation count is nonzero. | |
341 | + */ | |
342 | + unsigned deactivations; | |
343 | +}; | |
344 | + | |
345 | +extern int usb_string_id(struct usb_composite_dev *c); | |
346 | +extern int usb_string_ids_tab(struct usb_composite_dev *c, | |
347 | + struct usb_string *str); | |
348 | +extern int usb_string_ids_n(struct usb_composite_dev *c, unsigned n); | |
349 | + | |
350 | +#endif /* __LINUX_USB_COMPOSITE_H */ |
include/usb/lin_gadget_compat.h
... | ... | @@ -44,6 +44,25 @@ |
44 | 44 | |
45 | 45 | #define ENOTSUPP 524 /* Operation is not supported */ |
46 | 46 | |
47 | +#define BITS_PER_BYTE 8 | |
48 | +#define BITS_TO_LONGS(nr) \ | |
49 | + DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) | |
50 | +#define DECLARE_BITMAP(name, bits) \ | |
51 | + unsigned long name[BITS_TO_LONGS(bits)] | |
52 | + | |
53 | +#define small_const_nbits(nbits) \ | |
54 | + (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG) | |
55 | + | |
56 | +static inline void bitmap_zero(unsigned long *dst, int nbits) | |
57 | +{ | |
58 | + if (small_const_nbits(nbits)) | |
59 | + *dst = 0UL; | |
60 | + else { | |
61 | + int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); | |
62 | + memset(dst, 0, len); | |
63 | + } | |
64 | +} | |
65 | + | |
47 | 66 | #define dma_cache_maint(addr, size, mode) cache_flush() |
48 | 67 | void cache_flush(void); |
49 | 68 |