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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / gadget / function / f_sourcesink.c
blob8784fa12ea2c637b52857a15f01f6dbeb965ec15
1 /*
2 * f_sourcesink.c - USB peripheral source/sink configuration driver
3 *
4 * Copyright (C) 2003-2008 David Brownell
5 * Copyright (C) 2008 by Nokia Corporation
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
13 /* #define VERBOSE_DEBUG */
14
15 #include <linux/slab.h>
16 #include <linux/kernel.h>
17 #include <linux/device.h>
18 #include <linux/module.h>
19 #include <linux/usb/composite.h>
20 #include <linux/err.h>
21
22 #include "g_zero.h"
23 #include "u_f.h"
24
25 /*
26 * SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripheral
27 * controller drivers.
28 *
29 * This just sinks bulk packets OUT to the peripheral and sources them IN
30 * to the host, optionally with specific data patterns for integrity tests.
31 * As such it supports basic functionality and load tests.
32 *
33 * In terms of control messaging, this supports all the standard requests
34 * plus two that support control-OUT tests. If the optional "autoresume"
35 * mode is enabled, it provides good functional coverage for the "USBCV"
36 * test harness from USB-IF.
37 */
38 struct f_sourcesink {
39 struct usb_function function;
40
41 struct usb_ep *in_ep;
42 struct usb_ep *out_ep;
43 struct usb_ep *iso_in_ep;
44 struct usb_ep *iso_out_ep;
45 int cur_alt;
46
47 unsigned pattern;
48 unsigned isoc_interval;
49 unsigned isoc_maxpacket;
50 unsigned isoc_mult;
51 unsigned isoc_maxburst;
52 unsigned buflen;
53 unsigned bulk_qlen;
54 unsigned iso_qlen;
55 };
56
57 static inline struct f_sourcesink *func_to_ss(struct usb_function *f)
58 {
59 return container_of(f, struct f_sourcesink, function);
60 }
61
62 /*-------------------------------------------------------------------------*/
63
64 static struct usb_interface_descriptor source_sink_intf_alt0 = {
65 .bLength = USB_DT_INTERFACE_SIZE,
66 .bDescriptorType = USB_DT_INTERFACE,
67
68 .bAlternateSetting = 0,
69 .bNumEndpoints = 2,
70 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
71 /* .iInterface = DYNAMIC */
72 };
73
74 static struct usb_interface_descriptor source_sink_intf_alt1 = {
75 .bLength = USB_DT_INTERFACE_SIZE,
76 .bDescriptorType = USB_DT_INTERFACE,
77
78 .bAlternateSetting = 1,
79 .bNumEndpoints = 4,
80 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
81 /* .iInterface = DYNAMIC */
82 };
83
84 /* full speed support: */
85
86 static struct usb_endpoint_descriptor fs_source_desc = {
87 .bLength = USB_DT_ENDPOINT_SIZE,
88 .bDescriptorType = USB_DT_ENDPOINT,
89
90 .bEndpointAddress = USB_DIR_IN,
91 .bmAttributes = USB_ENDPOINT_XFER_BULK,
92 };
93
94 static struct usb_endpoint_descriptor fs_sink_desc = {
95 .bLength = USB_DT_ENDPOINT_SIZE,
96 .bDescriptorType = USB_DT_ENDPOINT,
97
98 .bEndpointAddress = USB_DIR_OUT,
99 .bmAttributes = USB_ENDPOINT_XFER_BULK,
100 };
101
102 static struct usb_endpoint_descriptor fs_iso_source_desc = {
103 .bLength = USB_DT_ENDPOINT_SIZE,
104 .bDescriptorType = USB_DT_ENDPOINT,
105
106 .bEndpointAddress = USB_DIR_IN,
107 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
108 .wMaxPacketSize = cpu_to_le16(1023),
109 .bInterval = 4,
110 };
111
112 static struct usb_endpoint_descriptor fs_iso_sink_desc = {
113 .bLength = USB_DT_ENDPOINT_SIZE,
114 .bDescriptorType = USB_DT_ENDPOINT,
115
116 .bEndpointAddress = USB_DIR_OUT,
117 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
118 .wMaxPacketSize = cpu_to_le16(1023),
119 .bInterval = 4,
120 };
121
122 static struct usb_descriptor_header *fs_source_sink_descs[] = {
123 (struct usb_descriptor_header *) &source_sink_intf_alt0,
124 (struct usb_descriptor_header *) &fs_sink_desc,
125 (struct usb_descriptor_header *) &fs_source_desc,
126 (struct usb_descriptor_header *) &source_sink_intf_alt1,
127 #define FS_ALT_IFC_1_OFFSET 3
128 (struct usb_descriptor_header *) &fs_sink_desc,
129 (struct usb_descriptor_header *) &fs_source_desc,
130 (struct usb_descriptor_header *) &fs_iso_sink_desc,
131 (struct usb_descriptor_header *) &fs_iso_source_desc,
132 NULL,
133 };
134
135 /* high speed support: */
136
137 static struct usb_endpoint_descriptor hs_source_desc = {
138 .bLength = USB_DT_ENDPOINT_SIZE,
139 .bDescriptorType = USB_DT_ENDPOINT,
140
141 .bmAttributes = USB_ENDPOINT_XFER_BULK,
142 .wMaxPacketSize = cpu_to_le16(512),
143 };
144
145 static struct usb_endpoint_descriptor hs_sink_desc = {
146 .bLength = USB_DT_ENDPOINT_SIZE,
147 .bDescriptorType = USB_DT_ENDPOINT,
148
149 .bmAttributes = USB_ENDPOINT_XFER_BULK,
150 .wMaxPacketSize = cpu_to_le16(512),
151 };
152
153 static struct usb_endpoint_descriptor hs_iso_source_desc = {
154 .bLength = USB_DT_ENDPOINT_SIZE,
155 .bDescriptorType = USB_DT_ENDPOINT,
156
157 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
158 .wMaxPacketSize = cpu_to_le16(1024),
159 .bInterval = 4,
160 };
161
162 static struct usb_endpoint_descriptor hs_iso_sink_desc = {
163 .bLength = USB_DT_ENDPOINT_SIZE,
164 .bDescriptorType = USB_DT_ENDPOINT,
165
166 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
167 .wMaxPacketSize = cpu_to_le16(1024),
168 .bInterval = 4,
169 };
170
171 static struct usb_descriptor_header *hs_source_sink_descs[] = {
172 (struct usb_descriptor_header *) &source_sink_intf_alt0,
173 (struct usb_descriptor_header *) &hs_source_desc,
174 (struct usb_descriptor_header *) &hs_sink_desc,
175 (struct usb_descriptor_header *) &source_sink_intf_alt1,
176 #define HS_ALT_IFC_1_OFFSET 3
177 (struct usb_descriptor_header *) &hs_source_desc,
178 (struct usb_descriptor_header *) &hs_sink_desc,
179 (struct usb_descriptor_header *) &hs_iso_source_desc,
180 (struct usb_descriptor_header *) &hs_iso_sink_desc,
181 NULL,
182 };
183
184 /* super speed support: */
185
186 static struct usb_endpoint_descriptor ss_source_desc = {
187 .bLength = USB_DT_ENDPOINT_SIZE,
188 .bDescriptorType = USB_DT_ENDPOINT,
189
190 .bmAttributes = USB_ENDPOINT_XFER_BULK,
191 .wMaxPacketSize = cpu_to_le16(1024),
192 };
193
194 static struct usb_ss_ep_comp_descriptor ss_source_comp_desc = {
195 .bLength = USB_DT_SS_EP_COMP_SIZE,
196 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
197
198 .bMaxBurst = 0,
199 .bmAttributes = 0,
200 .wBytesPerInterval = 0,
201 };
202
203 static struct usb_endpoint_descriptor ss_sink_desc = {
204 .bLength = USB_DT_ENDPOINT_SIZE,
205 .bDescriptorType = USB_DT_ENDPOINT,
206
207 .bmAttributes = USB_ENDPOINT_XFER_BULK,
208 .wMaxPacketSize = cpu_to_le16(1024),
209 };
210
211 static struct usb_ss_ep_comp_descriptor ss_sink_comp_desc = {
212 .bLength = USB_DT_SS_EP_COMP_SIZE,
213 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
214
215 .bMaxBurst = 0,
216 .bmAttributes = 0,
217 .wBytesPerInterval = 0,
218 };
219
220 static struct usb_endpoint_descriptor ss_iso_source_desc = {
221 .bLength = USB_DT_ENDPOINT_SIZE,
222 .bDescriptorType = USB_DT_ENDPOINT,
223
224 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
225 .wMaxPacketSize = cpu_to_le16(1024),
226 .bInterval = 4,
227 };
228
229 static struct usb_ss_ep_comp_descriptor ss_iso_source_comp_desc = {
230 .bLength = USB_DT_SS_EP_COMP_SIZE,
231 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
232
233 .bMaxBurst = 0,
234 .bmAttributes = 0,
235 .wBytesPerInterval = cpu_to_le16(1024),
236 };
237
238 static struct usb_endpoint_descriptor ss_iso_sink_desc = {
239 .bLength = USB_DT_ENDPOINT_SIZE,
240 .bDescriptorType = USB_DT_ENDPOINT,
241
242 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
243 .wMaxPacketSize = cpu_to_le16(1024),
244 .bInterval = 4,
245 };
246
247 static struct usb_ss_ep_comp_descriptor ss_iso_sink_comp_desc = {
248 .bLength = USB_DT_SS_EP_COMP_SIZE,
249 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
250
251 .bMaxBurst = 0,
252 .bmAttributes = 0,
253 .wBytesPerInterval = cpu_to_le16(1024),
254 };
255
256 static struct usb_descriptor_header *ss_source_sink_descs[] = {
257 (struct usb_descriptor_header *) &source_sink_intf_alt0,
258 (struct usb_descriptor_header *) &ss_source_desc,
259 (struct usb_descriptor_header *) &ss_source_comp_desc,
260 (struct usb_descriptor_header *) &ss_sink_desc,
261 (struct usb_descriptor_header *) &ss_sink_comp_desc,
262 (struct usb_descriptor_header *) &source_sink_intf_alt1,
263 #define SS_ALT_IFC_1_OFFSET 5
264 (struct usb_descriptor_header *) &ss_source_desc,
265 (struct usb_descriptor_header *) &ss_source_comp_desc,
266 (struct usb_descriptor_header *) &ss_sink_desc,
267 (struct usb_descriptor_header *) &ss_sink_comp_desc,
268 (struct usb_descriptor_header *) &ss_iso_source_desc,
269 (struct usb_descriptor_header *) &ss_iso_source_comp_desc,
270 (struct usb_descriptor_header *) &ss_iso_sink_desc,
271 (struct usb_descriptor_header *) &ss_iso_sink_comp_desc,
272 NULL,
273 };
274
275 /* function-specific strings: */
276
277 static struct usb_string strings_sourcesink[] = {
278 [0].s = "source and sink data",
279 { } /* end of list */
280 };
281
282 static struct usb_gadget_strings stringtab_sourcesink = {
283 .language = 0x0409, /* en-us */
284 .strings = strings_sourcesink,
285 };
286
287 static struct usb_gadget_strings *sourcesink_strings[] = {
288 &stringtab_sourcesink,
289 NULL,
290 };
291
292 /*-------------------------------------------------------------------------*/
293
294 static inline struct usb_request *ss_alloc_ep_req(struct usb_ep *ep, int len)
295 {
296 return alloc_ep_req(ep, len);
297 }
298
299 static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
300 {
301 int value;
302
303 value = usb_ep_disable(ep);
304 if (value < 0)
305 DBG(cdev, "disable %s --> %d\n", ep->name, value);
306 }
307
308 void disable_endpoints(struct usb_composite_dev *cdev,
309 struct usb_ep *in, struct usb_ep *out,
310 struct usb_ep *iso_in, struct usb_ep *iso_out)
311 {
312 disable_ep(cdev, in);
313 disable_ep(cdev, out);
314 if (iso_in)
315 disable_ep(cdev, iso_in);
316 if (iso_out)
317 disable_ep(cdev, iso_out);
318 }
319
320 static int
321 sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
322 {
323 struct usb_composite_dev *cdev = c->cdev;
324 struct f_sourcesink *ss = func_to_ss(f);
325 int id;
326 int ret;
327
328 /* allocate interface ID(s) */
329 id = usb_interface_id(c, f);
330 if (id < 0)
331 return id;
332 source_sink_intf_alt0.bInterfaceNumber = id;
333 source_sink_intf_alt1.bInterfaceNumber = id;
334
335 /* allocate bulk endpoints */
336 ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
337 if (!ss->in_ep) {
338 autoconf_fail:
339 ERROR(cdev, "%s: can't autoconfigure on %s\n",
340 f->name, cdev->gadget->name);
341 return -ENODEV;
342 }
343
344 ss->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
345 if (!ss->out_ep)
346 goto autoconf_fail;
347
348 /* sanity check the isoc module parameters */
349 if (ss->isoc_interval < 1)
350 ss->isoc_interval = 1;
351 if (ss->isoc_interval > 16)
352 ss->isoc_interval = 16;
353 if (ss->isoc_mult > 2)
354 ss->isoc_mult = 2;
355 if (ss->isoc_maxburst > 15)
356 ss->isoc_maxburst = 15;
357
358 /* fill in the FS isoc descriptors from the module parameters */
359 fs_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket > 1023 ?
360 1023 : ss->isoc_maxpacket;
361 fs_iso_source_desc.bInterval = ss->isoc_interval;
362 fs_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket > 1023 ?
363 1023 : ss->isoc_maxpacket;
364 fs_iso_sink_desc.bInterval = ss->isoc_interval;
365
366 /* allocate iso endpoints */
367 ss->iso_in_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_source_desc);
368 if (!ss->iso_in_ep)
369 goto no_iso;
370
371 ss->iso_out_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_sink_desc);
372 if (!ss->iso_out_ep) {
373 usb_ep_autoconfig_release(ss->iso_in_ep);
374 ss->iso_in_ep = NULL;
375 no_iso:
376 /*
377 * We still want to work even if the UDC doesn't have isoc
378 * endpoints, so null out the alt interface that contains
379 * them and continue.
380 */
381 fs_source_sink_descs[FS_ALT_IFC_1_OFFSET] = NULL;
382 hs_source_sink_descs[HS_ALT_IFC_1_OFFSET] = NULL;
383 ss_source_sink_descs[SS_ALT_IFC_1_OFFSET] = NULL;
384 }
385
386 if (ss->isoc_maxpacket > 1024)
387 ss->isoc_maxpacket = 1024;
388
389 /* support high speed hardware */
390 hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
391 hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
392
393 /*
394 * Fill in the HS isoc descriptors from the module parameters.
395 * We assume that the user knows what they are doing and won't
396 * give parameters that their UDC doesn't support.
397 */
398 hs_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket;
399 hs_iso_source_desc.wMaxPacketSize |= ss->isoc_mult << 11;
400 hs_iso_source_desc.bInterval = ss->isoc_interval;
401 hs_iso_source_desc.bEndpointAddress =
402 fs_iso_source_desc.bEndpointAddress;
403
404 hs_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket;
405 hs_iso_sink_desc.wMaxPacketSize |= ss->isoc_mult << 11;
406 hs_iso_sink_desc.bInterval = ss->isoc_interval;
407 hs_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
408
409 /* support super speed hardware */
410 ss_source_desc.bEndpointAddress =
411 fs_source_desc.bEndpointAddress;
412 ss_sink_desc.bEndpointAddress =
413 fs_sink_desc.bEndpointAddress;
414
415 /*
416 * Fill in the SS isoc descriptors from the module parameters.
417 * We assume that the user knows what they are doing and won't
418 * give parameters that their UDC doesn't support.
419 */
420 ss_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket;
421 ss_iso_source_desc.bInterval = ss->isoc_interval;
422 ss_iso_source_comp_desc.bmAttributes = ss->isoc_mult;
423 ss_iso_source_comp_desc.bMaxBurst = ss->isoc_maxburst;
424 ss_iso_source_comp_desc.wBytesPerInterval = ss->isoc_maxpacket *
425 (ss->isoc_mult + 1) * (ss->isoc_maxburst + 1);
426 ss_iso_source_desc.bEndpointAddress =
427 fs_iso_source_desc.bEndpointAddress;
428
429 ss_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket;
430 ss_iso_sink_desc.bInterval = ss->isoc_interval;
431 ss_iso_sink_comp_desc.bmAttributes = ss->isoc_mult;
432 ss_iso_sink_comp_desc.bMaxBurst = ss->isoc_maxburst;
433 ss_iso_sink_comp_desc.wBytesPerInterval = ss->isoc_maxpacket *
434 (ss->isoc_mult + 1) * (ss->isoc_maxburst + 1);
435 ss_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
436
437 ret = usb_assign_descriptors(f, fs_source_sink_descs,
438 hs_source_sink_descs, ss_source_sink_descs, NULL);
439 if (ret)
440 return ret;
441
442 DBG(cdev, "%s speed %s: IN/%s, OUT/%s, ISO-IN/%s, ISO-OUT/%s\n",
443 (gadget_is_superspeed(c->cdev->gadget) ? "super" :
444 (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")),
445 f->name, ss->in_ep->name, ss->out_ep->name,
446 ss->iso_in_ep ? ss->iso_in_ep->name : "<none>",
447 ss->iso_out_ep ? ss->iso_out_ep->name : "<none>");
448 return 0;
449 }
450
451 static void
452 sourcesink_free_func(struct usb_function *f)
453 {
454 struct f_ss_opts *opts;
455
456 opts = container_of(f->fi, struct f_ss_opts, func_inst);
457
458 mutex_lock(&opts->lock);
459 opts->refcnt--;
460 mutex_unlock(&opts->lock);
461
462 usb_free_all_descriptors(f);
463 kfree(func_to_ss(f));
464 }
465
466 /* optionally require specific source/sink data patterns */
467 static int check_read_data(struct f_sourcesink *ss, struct usb_request *req)
468 {
469 unsigned i;
470 u8 *buf = req->buf;
471 struct usb_composite_dev *cdev = ss->function.config->cdev;
472 int max_packet_size = le16_to_cpu(ss->out_ep->desc->wMaxPacketSize);
473
474 if (ss->pattern == 2)
475 return 0;
476
477 for (i = 0; i < req->actual; i++, buf++) {
478 switch (ss->pattern) {
479
480 /* all-zeroes has no synchronization issues */
481 case 0:
482 if (*buf == 0)
483 continue;
484 break;
485
486 /* "mod63" stays in sync with short-terminated transfers,
487 * OR otherwise when host and gadget agree on how large
488 * each usb transfer request should be. Resync is done
489 * with set_interface or set_config. (We *WANT* it to
490 * get quickly out of sync if controllers or their drivers
491 * stutter for any reason, including buffer duplication...)
492 */
493 case 1:
494 if (*buf == (u8)((i % max_packet_size) % 63))
495 continue;
496 break;
497 }
498 ERROR(cdev, "bad OUT byte, buf[%d] = %d\n", i, *buf);
499 usb_ep_set_halt(ss->out_ep);
500 return -EINVAL;
501 }
502 return 0;
503 }
504
505 static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
506 {
507 unsigned i;
508 u8 *buf = req->buf;
509 int max_packet_size = le16_to_cpu(ep->desc->wMaxPacketSize);
510 struct f_sourcesink *ss = ep->driver_data;
511
512 switch (ss->pattern) {
513 case 0:
514 memset(req->buf, 0, req->length);
515 break;
516 case 1:
517 for (i = 0; i < req->length; i++)
518 *buf++ = (u8) ((i % max_packet_size) % 63);
519 break;
520 case 2:
521 break;
522 }
523 }
524
525 static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
526 {
527 struct usb_composite_dev *cdev;
528 struct f_sourcesink *ss = ep->driver_data;
529 int status = req->status;
530
531 /* driver_data will be null if ep has been disabled */
532 if (!ss)
533 return;
534
535 cdev = ss->function.config->cdev;
536
537 switch (status) {
538
539 case 0: /* normal completion? */
540 if (ep == ss->out_ep) {
541 check_read_data(ss, req);
542 if (ss->pattern != 2)
543 memset(req->buf, 0x55, req->length);
544 }
545 break;
546
547 /* this endpoint is normally active while we're configured */
548 case -ECONNABORTED: /* hardware forced ep reset */
549 case -ECONNRESET: /* request dequeued */
550 case -ESHUTDOWN: /* disconnect from host */
551 VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
552 req->actual, req->length);
553 if (ep == ss->out_ep)
554 check_read_data(ss, req);
555 free_ep_req(ep, req);
556 return;
557
558 case -EOVERFLOW: /* buffer overrun on read means that
559 * we didn't provide a big enough
560 * buffer.
561 */
562 default:
563 #if 1
564 DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
565 status, req->actual, req->length);
566 #endif
567 case -EREMOTEIO: /* short read */
568 break;
569 }
570
571 status = usb_ep_queue(ep, req, GFP_ATOMIC);
572 if (status) {
573 ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n",
574 ep->name, req->length, status);
575 usb_ep_set_halt(ep);
576 /* FIXME recover later ... somehow */
577 }
578 }
579
580 static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in,
581 bool is_iso, int speed)
582 {
583 struct usb_ep *ep;
584 struct usb_request *req;
585 int i, size, qlen, status = 0;
586
587 if (is_iso) {
588 switch (speed) {
589 case USB_SPEED_SUPER:
590 size = ss->isoc_maxpacket *
591 (ss->isoc_mult + 1) *
592 (ss->isoc_maxburst + 1);
593 break;
594 case USB_SPEED_HIGH:
595 size = ss->isoc_maxpacket * (ss->isoc_mult + 1);
596 break;
597 default:
598 size = ss->isoc_maxpacket > 1023 ?
599 1023 : ss->isoc_maxpacket;
600 break;
601 }
602 ep = is_in ? ss->iso_in_ep : ss->iso_out_ep;
603 qlen = ss->iso_qlen;
604 } else {
605 ep = is_in ? ss->in_ep : ss->out_ep;
606 qlen = ss->bulk_qlen;
607 size = ss->buflen;
608 }
609
610 for (i = 0; i < qlen; i++) {
611 req = ss_alloc_ep_req(ep, size);
612 if (!req)
613 return -ENOMEM;
614
615 req->complete = source_sink_complete;
616 if (is_in)
617 reinit_write_data(ep, req);
618 else if (ss->pattern != 2)
619 memset(req->buf, 0x55, req->length);
620
621 status = usb_ep_queue(ep, req, GFP_ATOMIC);
622 if (status) {
623 struct usb_composite_dev *cdev;
624
625 cdev = ss->function.config->cdev;
626 ERROR(cdev, "start %s%s %s --> %d\n",
627 is_iso ? "ISO-" : "", is_in ? "IN" : "OUT",
628 ep->name, status);
629 free_ep_req(ep, req);
630 return status;
631 }
632 }
633
634 return status;
635 }
636
637 static void disable_source_sink(struct f_sourcesink *ss)
638 {
639 struct usb_composite_dev *cdev;
640
641 cdev = ss->function.config->cdev;
642 disable_endpoints(cdev, ss->in_ep, ss->out_ep, ss->iso_in_ep,
643 ss->iso_out_ep);
644 VDBG(cdev, "%s disabled\n", ss->function.name);
645 }
646
647 static int
648 enable_source_sink(struct usb_composite_dev *cdev, struct f_sourcesink *ss,
649 int alt)
650 {
651 int result = 0;
652 int speed = cdev->gadget->speed;
653 struct usb_ep *ep;
654
655 /* one bulk endpoint writes (sources) zeroes IN (to the host) */
656 ep = ss->in_ep;
657 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
658 if (result)
659 return result;
660 result = usb_ep_enable(ep);
661 if (result < 0)
662 return result;
663 ep->driver_data = ss;
664
665 result = source_sink_start_ep(ss, true, false, speed);
666 if (result < 0) {
667 fail:
668 ep = ss->in_ep;
669 usb_ep_disable(ep);
670 return result;
671 }
672
673 /* one bulk endpoint reads (sinks) anything OUT (from the host) */
674 ep = ss->out_ep;
675 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
676 if (result)
677 goto fail;
678 result = usb_ep_enable(ep);
679 if (result < 0)
680 goto fail;
681 ep->driver_data = ss;
682
683 result = source_sink_start_ep(ss, false, false, speed);
684 if (result < 0) {
685 fail2:
686 ep = ss->out_ep;
687 usb_ep_disable(ep);
688 goto fail;
689 }
690
691 if (alt == 0)
692 goto out;
693
694 /* one iso endpoint writes (sources) zeroes IN (to the host) */
695 ep = ss->iso_in_ep;
696 if (ep) {
697 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
698 if (result)
699 goto fail2;
700 result = usb_ep_enable(ep);
701 if (result < 0)
702 goto fail2;
703 ep->driver_data = ss;
704
705 result = source_sink_start_ep(ss, true, true, speed);
706 if (result < 0) {
707 fail3:
708 ep = ss->iso_in_ep;
709 if (ep)
710 usb_ep_disable(ep);
711 goto fail2;
712 }
713 }
714
715 /* one iso endpoint reads (sinks) anything OUT (from the host) */
716 ep = ss->iso_out_ep;
717 if (ep) {
718 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
719 if (result)
720 goto fail3;
721 result = usb_ep_enable(ep);
722 if (result < 0)
723 goto fail3;
724 ep->driver_data = ss;
725
726 result = source_sink_start_ep(ss, false, true, speed);
727 if (result < 0) {
728 usb_ep_disable(ep);
729 goto fail3;
730 }
731 }
732 out:
733 ss->cur_alt = alt;
734
735 DBG(cdev, "%s enabled, alt intf %d\n", ss->function.name, alt);
736 return result;
737 }
738
739 static int sourcesink_set_alt(struct usb_function *f,
740 unsigned intf, unsigned alt)
741 {
742 struct f_sourcesink *ss = func_to_ss(f);
743 struct usb_composite_dev *cdev = f->config->cdev;
744
745 disable_source_sink(ss);
746 return enable_source_sink(cdev, ss, alt);
747 }
748
749 static int sourcesink_get_alt(struct usb_function *f, unsigned intf)
750 {
751 struct f_sourcesink *ss = func_to_ss(f);
752
753 return ss->cur_alt;
754 }
755
756 static void sourcesink_disable(struct usb_function *f)
757 {
758 struct f_sourcesink *ss = func_to_ss(f);
759
760 disable_source_sink(ss);
761 }
762
763 /*-------------------------------------------------------------------------*/
764
765 static int sourcesink_setup(struct usb_function *f,
766 const struct usb_ctrlrequest *ctrl)
767 {
768 struct usb_configuration *c = f->config;
769 struct usb_request *req = c->cdev->req;
770 int value = -EOPNOTSUPP;
771 u16 w_index = le16_to_cpu(ctrl->wIndex);
772 u16 w_value = le16_to_cpu(ctrl->wValue);
773 u16 w_length = le16_to_cpu(ctrl->wLength);
774
775 req->length = USB_COMP_EP0_BUFSIZ;
776
777 /* composite driver infrastructure handles everything except
778 * the two control test requests.
779 */
780 switch (ctrl->bRequest) {
781
782 /*
783 * These are the same vendor-specific requests supported by
784 * Intel's USB 2.0 compliance test devices. We exceed that
785 * device spec by allowing multiple-packet requests.
786 *
787 * NOTE: the Control-OUT data stays in req->buf ... better
788 * would be copying it into a scratch buffer, so that other
789 * requests may safely intervene.
790 */
791 case 0x5b: /* control WRITE test -- fill the buffer */
792 if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
793 goto unknown;
794 if (w_value || w_index)
795 break;
796 /* just read that many bytes into the buffer */
797 if (w_length > req->length)
798 break;
799 value = w_length;
800 break;
801 case 0x5c: /* control READ test -- return the buffer */
802 if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
803 goto unknown;
804 if (w_value || w_index)
805 break;
806 /* expect those bytes are still in the buffer; send back */
807 if (w_length > req->length)
808 break;
809 value = w_length;
810 break;
811
812 default:
813 unknown:
814 VDBG(c->cdev,
815 "unknown control req%02x.%02x v%04x i%04x l%d\n",
816 ctrl->bRequestType, ctrl->bRequest,
817 w_value, w_index, w_length);
818 }
819
820 /* respond with data transfer or status phase? */
821 if (value >= 0) {
822 VDBG(c->cdev, "source/sink req%02x.%02x v%04x i%04x l%d\n",
823 ctrl->bRequestType, ctrl->bRequest,
824 w_value, w_index, w_length);
825 req->zero = 0;
826 req->length = value;
827 value = usb_ep_queue(c->cdev->gadget->ep0, req, GFP_ATOMIC);
828 if (value < 0)
829 ERROR(c->cdev, "source/sink response, err %d\n",
830 value);
831 }
832
833 /* device either stalls (value < 0) or reports success */
834 return value;
835 }
836
837 static struct usb_function *source_sink_alloc_func(
838 struct usb_function_instance *fi)
839 {
840 struct f_sourcesink *ss;
841 struct f_ss_opts *ss_opts;
842
843 ss = kzalloc(sizeof(*ss), GFP_KERNEL);
844 if (!ss)
845 return NULL;
846
847 ss_opts = container_of(fi, struct f_ss_opts, func_inst);
848
849 mutex_lock(&ss_opts->lock);
850 ss_opts->refcnt++;
851 mutex_unlock(&ss_opts->lock);
852
853 ss->pattern = ss_opts->pattern;
854 ss->isoc_interval = ss_opts->isoc_interval;
855 ss->isoc_maxpacket = ss_opts->isoc_maxpacket;
856 ss->isoc_mult = ss_opts->isoc_mult;
857 ss->isoc_maxburst = ss_opts->isoc_maxburst;
858 ss->buflen = ss_opts->bulk_buflen;
859 ss->bulk_qlen = ss_opts->bulk_qlen;
860 ss->iso_qlen = ss_opts->iso_qlen;
861
862 ss->function.name = "source/sink";
863 ss->function.bind = sourcesink_bind;
864 ss->function.set_alt = sourcesink_set_alt;
865 ss->function.get_alt = sourcesink_get_alt;
866 ss->function.disable = sourcesink_disable;
867 ss->function.setup = sourcesink_setup;
868 ss->function.strings = sourcesink_strings;
869
870 ss->function.free_func = sourcesink_free_func;
871
872 return &ss->function;
873 }
874
875 static inline struct f_ss_opts *to_f_ss_opts(struct config_item *item)
876 {
877 return container_of(to_config_group(item), struct f_ss_opts,
878 func_inst.group);
879 }
880
881 static void ss_attr_release(struct config_item *item)
882 {
883 struct f_ss_opts *ss_opts = to_f_ss_opts(item);
884
885 usb_put_function_instance(&ss_opts->func_inst);
886 }
887
888 static struct configfs_item_operations ss_item_ops = {
889 .release = ss_attr_release,
890 };
891
892 static ssize_t f_ss_opts_pattern_show(struct config_item *item, char *page)
893 {
894 struct f_ss_opts *opts = to_f_ss_opts(item);
895 int result;
896
897 mutex_lock(&opts->lock);
898 result = sprintf(page, "%u\n", opts->pattern);
899 mutex_unlock(&opts->lock);
900
901 return result;
902 }
903
904 static ssize_t f_ss_opts_pattern_store(struct config_item *item,
905 const char *page, size_t len)
906 {
907 struct f_ss_opts *opts = to_f_ss_opts(item);
908 int ret;
909 u8 num;
910
911 mutex_lock(&opts->lock);
912 if (opts->refcnt) {
913 ret = -EBUSY;
914 goto end;
915 }
916
917 ret = kstrtou8(page, 0, &num);
918 if (ret)
919 goto end;
920
921 if (num != 0 && num != 1 && num != 2) {
922 ret = -EINVAL;
923 goto end;
924 }
925
926 opts->pattern = num;
927 ret = len;
928 end:
929 mutex_unlock(&opts->lock);
930 return ret;
931 }
932
933 CONFIGFS_ATTR(f_ss_opts_, pattern);
934
935 static ssize_t f_ss_opts_isoc_interval_show(struct config_item *item, char *page)
936 {
937 struct f_ss_opts *opts = to_f_ss_opts(item);
938 int result;
939
940 mutex_lock(&opts->lock);
941 result = sprintf(page, "%u\n", opts->isoc_interval);
942 mutex_unlock(&opts->lock);
943
944 return result;
945 }
946
947 static ssize_t f_ss_opts_isoc_interval_store(struct config_item *item,
948 const char *page, size_t len)
949 {
950 struct f_ss_opts *opts = to_f_ss_opts(item);
951 int ret;
952 u8 num;
953
954 mutex_lock(&opts->lock);
955 if (opts->refcnt) {
956 ret = -EBUSY;
957 goto end;
958 }
959
960 ret = kstrtou8(page, 0, &num);
961 if (ret)
962 goto end;
963
964 if (num > 16) {
965 ret = -EINVAL;
966 goto end;
967 }
968
969 opts->isoc_interval = num;
970 ret = len;
971 end:
972 mutex_unlock(&opts->lock);
973 return ret;
974 }
975
976 CONFIGFS_ATTR(f_ss_opts_, isoc_interval);
977
978 static ssize_t f_ss_opts_isoc_maxpacket_show(struct config_item *item, char *page)
979 {
980 struct f_ss_opts *opts = to_f_ss_opts(item);
981 int result;
982
983 mutex_lock(&opts->lock);
984 result = sprintf(page, "%u\n", opts->isoc_maxpacket);
985 mutex_unlock(&opts->lock);
986
987 return result;
988 }
989
990 static ssize_t f_ss_opts_isoc_maxpacket_store(struct config_item *item,
991 const char *page, size_t len)
992 {
993 struct f_ss_opts *opts = to_f_ss_opts(item);
994 int ret;
995 u16 num;
996
997 mutex_lock(&opts->lock);
998 if (opts->refcnt) {
999 ret = -EBUSY;
1000 goto end;
1001 }
1002
1003 ret = kstrtou16(page, 0, &num);
1004 if (ret)
1005 goto end;
1006
1007 if (num > 1024) {
1008 ret = -EINVAL;
1009 goto end;
1010 }
1011
1012 opts->isoc_maxpacket = num;
1013 ret = len;
1014 end:
1015 mutex_unlock(&opts->lock);
1016 return ret;
1017 }
1018
1019 CONFIGFS_ATTR(f_ss_opts_, isoc_maxpacket);
1020
1021 static ssize_t f_ss_opts_isoc_mult_show(struct config_item *item, char *page)
1022 {
1023 struct f_ss_opts *opts = to_f_ss_opts(item);
1024 int result;
1025
1026 mutex_lock(&opts->lock);
1027 result = sprintf(page, "%u\n", opts->isoc_mult);
1028 mutex_unlock(&opts->lock);
1029
1030 return result;
1031 }
1032
1033 static ssize_t f_ss_opts_isoc_mult_store(struct config_item *item,
1034 const char *page, size_t len)
1035 {
1036 struct f_ss_opts *opts = to_f_ss_opts(item);
1037 int ret;
1038 u8 num;
1039
1040 mutex_lock(&opts->lock);
1041 if (opts->refcnt) {
1042 ret = -EBUSY;
1043 goto end;
1044 }
1045
1046 ret = kstrtou8(page, 0, &num);
1047 if (ret)
1048 goto end;
1049
1050 if (num > 2) {
1051 ret = -EINVAL;
1052 goto end;
1053 }
1054
1055 opts->isoc_mult = num;
1056 ret = len;
1057 end:
1058 mutex_unlock(&opts->lock);
1059 return ret;
1060 }
1061
1062 CONFIGFS_ATTR(f_ss_opts_, isoc_mult);
1063
1064 static ssize_t f_ss_opts_isoc_maxburst_show(struct config_item *item, char *page)
1065 {
1066 struct f_ss_opts *opts = to_f_ss_opts(item);
1067 int result;
1068
1069 mutex_lock(&opts->lock);
1070 result = sprintf(page, "%u\n", opts->isoc_maxburst);
1071 mutex_unlock(&opts->lock);
1072
1073 return result;
1074 }
1075
1076 static ssize_t f_ss_opts_isoc_maxburst_store(struct config_item *item,
1077 const char *page, size_t len)
1078 {
1079 struct f_ss_opts *opts = to_f_ss_opts(item);
1080 int ret;
1081 u8 num;
1082
1083 mutex_lock(&opts->lock);
1084 if (opts->refcnt) {
1085 ret = -EBUSY;
1086 goto end;
1087 }
1088
1089 ret = kstrtou8(page, 0, &num);
1090 if (ret)
1091 goto end;
1092
1093 if (num > 15) {
1094 ret = -EINVAL;
1095 goto end;
1096 }
1097
1098 opts->isoc_maxburst = num;
1099 ret = len;
1100 end:
1101 mutex_unlock(&opts->lock);
1102 return ret;
1103 }
1104
1105 CONFIGFS_ATTR(f_ss_opts_, isoc_maxburst);
1106
1107 static ssize_t f_ss_opts_bulk_buflen_show(struct config_item *item, char *page)
1108 {
1109 struct f_ss_opts *opts = to_f_ss_opts(item);
1110 int result;
1111
1112 mutex_lock(&opts->lock);
1113 result = sprintf(page, "%u\n", opts->bulk_buflen);
1114 mutex_unlock(&opts->lock);
1115
1116 return result;
1117 }
1118
1119 static ssize_t f_ss_opts_bulk_buflen_store(struct config_item *item,
1120 const char *page, size_t len)
1121 {
1122 struct f_ss_opts *opts = to_f_ss_opts(item);
1123 int ret;
1124 u32 num;
1125
1126 mutex_lock(&opts->lock);
1127 if (opts->refcnt) {
1128 ret = -EBUSY;
1129 goto end;
1130 }
1131
1132 ret = kstrtou32(page, 0, &num);
1133 if (ret)
1134 goto end;
1135
1136 opts->bulk_buflen = num;
1137 ret = len;
1138 end:
1139 mutex_unlock(&opts->lock);
1140 return ret;
1141 }
1142
1143 CONFIGFS_ATTR(f_ss_opts_, bulk_buflen);
1144
1145 static ssize_t f_ss_opts_bulk_qlen_show(struct config_item *item, char *page)
1146 {
1147 struct f_ss_opts *opts = to_f_ss_opts(item);
1148 int result;
1149
1150 mutex_lock(&opts->lock);
1151 result = sprintf(page, "%u\n", opts->bulk_qlen);
1152 mutex_unlock(&opts->lock);
1153
1154 return result;
1155 }
1156
1157 static ssize_t f_ss_opts_bulk_qlen_store(struct config_item *item,
1158 const char *page, size_t len)
1159 {
1160 struct f_ss_opts *opts = to_f_ss_opts(item);
1161 int ret;
1162 u32 num;
1163
1164 mutex_lock(&opts->lock);
1165 if (opts->refcnt) {
1166 ret = -EBUSY;
1167 goto end;
1168 }
1169
1170 ret = kstrtou32(page, 0, &num);
1171 if (ret)
1172 goto end;
1173
1174 opts->bulk_qlen = num;
1175 ret = len;
1176 end:
1177 mutex_unlock(&opts->lock);
1178 return ret;
1179 }
1180
1181 CONFIGFS_ATTR(f_ss_opts_, bulk_qlen);
1182
1183 static ssize_t f_ss_opts_iso_qlen_show(struct config_item *item, char *page)
1184 {
1185 struct f_ss_opts *opts = to_f_ss_opts(item);
1186 int result;
1187
1188 mutex_lock(&opts->lock);
1189 result = sprintf(page, "%u\n", opts->iso_qlen);
1190 mutex_unlock(&opts->lock);
1191
1192 return result;
1193 }
1194
1195 static ssize_t f_ss_opts_iso_qlen_store(struct config_item *item,
1196 const char *page, size_t len)
1197 {
1198 struct f_ss_opts *opts = to_f_ss_opts(item);
1199 int ret;
1200 u32 num;
1201
1202 mutex_lock(&opts->lock);
1203 if (opts->refcnt) {
1204 ret = -EBUSY;
1205 goto end;
1206 }
1207
1208 ret = kstrtou32(page, 0, &num);
1209 if (ret)
1210 goto end;
1211
1212 opts->iso_qlen = num;
1213 ret = len;
1214 end:
1215 mutex_unlock(&opts->lock);
1216 return ret;
1217 }
1218
1219 CONFIGFS_ATTR(f_ss_opts_, iso_qlen);
1220
1221 static struct configfs_attribute *ss_attrs[] = {
1222 &f_ss_opts_attr_pattern,
1223 &f_ss_opts_attr_isoc_interval,
1224 &f_ss_opts_attr_isoc_maxpacket,
1225 &f_ss_opts_attr_isoc_mult,
1226 &f_ss_opts_attr_isoc_maxburst,
1227 &f_ss_opts_attr_bulk_buflen,
1228 &f_ss_opts_attr_bulk_qlen,
1229 &f_ss_opts_attr_iso_qlen,
1230 NULL,
1231 };
1232
1233 static struct config_item_type ss_func_type = {
1234 .ct_item_ops = &ss_item_ops,
1235 .ct_attrs = ss_attrs,
1236 .ct_owner = THIS_MODULE,
1237 };
1238
1239 static void source_sink_free_instance(struct usb_function_instance *fi)
1240 {
1241 struct f_ss_opts *ss_opts;
1242
1243 ss_opts = container_of(fi, struct f_ss_opts, func_inst);
1244 kfree(ss_opts);
1245 }
1246
1247 static struct usb_function_instance *source_sink_alloc_inst(void)
1248 {
1249 struct f_ss_opts *ss_opts;
1250
1251 ss_opts = kzalloc(sizeof(*ss_opts), GFP_KERNEL);
1252 if (!ss_opts)
1253 return ERR_PTR(-ENOMEM);
1254 mutex_init(&ss_opts->lock);
1255 ss_opts->func_inst.free_func_inst = source_sink_free_instance;
1256 ss_opts->isoc_interval = GZERO_ISOC_INTERVAL;
1257 ss_opts->isoc_maxpacket = GZERO_ISOC_MAXPACKET;
1258 ss_opts->bulk_buflen = GZERO_BULK_BUFLEN;
1259 ss_opts->bulk_qlen = GZERO_SS_BULK_QLEN;
1260 ss_opts->iso_qlen = GZERO_SS_ISO_QLEN;
1261
1262 config_group_init_type_name(&ss_opts->func_inst.group, "",
1263 &ss_func_type);
1264
1265 return &ss_opts->func_inst;
1266 }
1267 DECLARE_USB_FUNCTION(SourceSink, source_sink_alloc_inst,
1268 source_sink_alloc_func);
1269
1270 static int __init sslb_modinit(void)
1271 {
1272 int ret;
1273
1274 ret = usb_function_register(&SourceSinkusb_func);
1275 if (ret)
1276 return ret;
1277 ret = lb_modinit();
1278 if (ret)
1279 usb_function_unregister(&SourceSinkusb_func);
1280 return ret;
1281 }
1282 static void __exit sslb_modexit(void)
1283 {
1284 usb_function_unregister(&SourceSinkusb_func);
1285 lb_modexit();
1286 }
1287 module_init(sslb_modinit);
1288 module_exit(sslb_modexit);
1289
1290 MODULE_LICENSE("GPL");
Linux with added FPC-III support