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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
[deliverable/linux.git] / drivers / usb / gadget / function / f_sourcesink.c
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 struct f_sourcesink *ss = ep->driver_data;
297
298 return alloc_ep_req(ep, len, ss->buflen);
299 }
300
301 static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
302 {
303 int value;
304
305 value = usb_ep_disable(ep);
306 if (value < 0)
307 DBG(cdev, "disable %s --> %d\n", ep->name, value);
308 }
309
310 void disable_endpoints(struct usb_composite_dev *cdev,
311 struct usb_ep *in, struct usb_ep *out,
312 struct usb_ep *iso_in, struct usb_ep *iso_out)
313 {
314 disable_ep(cdev, in);
315 disable_ep(cdev, out);
316 if (iso_in)
317 disable_ep(cdev, iso_in);
318 if (iso_out)
319 disable_ep(cdev, iso_out);
320 }
321
322 static int
323 sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
324 {
325 struct usb_composite_dev *cdev = c->cdev;
326 struct f_sourcesink *ss = func_to_ss(f);
327 int id;
328 int ret;
329
330 /* allocate interface ID(s) */
331 id = usb_interface_id(c, f);
332 if (id < 0)
333 return id;
334 source_sink_intf_alt0.bInterfaceNumber = id;
335 source_sink_intf_alt1.bInterfaceNumber = id;
336
337 /* allocate bulk endpoints */
338 ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
339 if (!ss->in_ep) {
340 autoconf_fail:
341 ERROR(cdev, "%s: can't autoconfigure on %s\n",
342 f->name, cdev->gadget->name);
343 return -ENODEV;
344 }
345
346 ss->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
347 if (!ss->out_ep)
348 goto autoconf_fail;
349
350 /* sanity check the isoc module parameters */
351 if (ss->isoc_interval < 1)
352 ss->isoc_interval = 1;
353 if (ss->isoc_interval > 16)
354 ss->isoc_interval = 16;
355 if (ss->isoc_mult > 2)
356 ss->isoc_mult = 2;
357 if (ss->isoc_maxburst > 15)
358 ss->isoc_maxburst = 15;
359
360 /* fill in the FS isoc descriptors from the module parameters */
361 fs_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket > 1023 ?
362 1023 : ss->isoc_maxpacket;
363 fs_iso_source_desc.bInterval = ss->isoc_interval;
364 fs_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket > 1023 ?
365 1023 : ss->isoc_maxpacket;
366 fs_iso_sink_desc.bInterval = ss->isoc_interval;
367
368 /* allocate iso endpoints */
369 ss->iso_in_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_source_desc);
370 if (!ss->iso_in_ep)
371 goto no_iso;
372
373 ss->iso_out_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_sink_desc);
374 if (!ss->iso_out_ep) {
375 usb_ep_autoconfig_release(ss->iso_in_ep);
376 ss->iso_in_ep = NULL;
377 no_iso:
378 /*
379 * We still want to work even if the UDC doesn't have isoc
380 * endpoints, so null out the alt interface that contains
381 * them and continue.
382 */
383 fs_source_sink_descs[FS_ALT_IFC_1_OFFSET] = NULL;
384 hs_source_sink_descs[HS_ALT_IFC_1_OFFSET] = NULL;
385 ss_source_sink_descs[SS_ALT_IFC_1_OFFSET] = NULL;
386 }
387
388 if (ss->isoc_maxpacket > 1024)
389 ss->isoc_maxpacket = 1024;
390
391 /* support high speed hardware */
392 hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
393 hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
394
395 /*
396 * Fill in the HS isoc descriptors from the module parameters.
397 * We assume that the user knows what they are doing and won't
398 * give parameters that their UDC doesn't support.
399 */
400 hs_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket;
401 hs_iso_source_desc.wMaxPacketSize |= ss->isoc_mult << 11;
402 hs_iso_source_desc.bInterval = ss->isoc_interval;
403 hs_iso_source_desc.bEndpointAddress =
404 fs_iso_source_desc.bEndpointAddress;
405
406 hs_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket;
407 hs_iso_sink_desc.wMaxPacketSize |= ss->isoc_mult << 11;
408 hs_iso_sink_desc.bInterval = ss->isoc_interval;
409 hs_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
410
411 /* support super speed hardware */
412 ss_source_desc.bEndpointAddress =
413 fs_source_desc.bEndpointAddress;
414 ss_sink_desc.bEndpointAddress =
415 fs_sink_desc.bEndpointAddress;
416
417 /*
418 * Fill in the SS isoc descriptors from the module parameters.
419 * We assume that the user knows what they are doing and won't
420 * give parameters that their UDC doesn't support.
421 */
422 ss_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket;
423 ss_iso_source_desc.bInterval = ss->isoc_interval;
424 ss_iso_source_comp_desc.bmAttributes = ss->isoc_mult;
425 ss_iso_source_comp_desc.bMaxBurst = ss->isoc_maxburst;
426 ss_iso_source_comp_desc.wBytesPerInterval = ss->isoc_maxpacket *
427 (ss->isoc_mult + 1) * (ss->isoc_maxburst + 1);
428 ss_iso_source_desc.bEndpointAddress =
429 fs_iso_source_desc.bEndpointAddress;
430
431 ss_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket;
432 ss_iso_sink_desc.bInterval = ss->isoc_interval;
433 ss_iso_sink_comp_desc.bmAttributes = ss->isoc_mult;
434 ss_iso_sink_comp_desc.bMaxBurst = ss->isoc_maxburst;
435 ss_iso_sink_comp_desc.wBytesPerInterval = ss->isoc_maxpacket *
436 (ss->isoc_mult + 1) * (ss->isoc_maxburst + 1);
437 ss_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
438
439 ret = usb_assign_descriptors(f, fs_source_sink_descs,
440 hs_source_sink_descs, ss_source_sink_descs, NULL);
441 if (ret)
442 return ret;
443
444 DBG(cdev, "%s speed %s: IN/%s, OUT/%s, ISO-IN/%s, ISO-OUT/%s\n",
445 (gadget_is_superspeed(c->cdev->gadget) ? "super" :
446 (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")),
447 f->name, ss->in_ep->name, ss->out_ep->name,
448 ss->iso_in_ep ? ss->iso_in_ep->name : "<none>",
449 ss->iso_out_ep ? ss->iso_out_ep->name : "<none>");
450 return 0;
451 }
452
453 static void
454 sourcesink_free_func(struct usb_function *f)
455 {
456 struct f_ss_opts *opts;
457
458 opts = container_of(f->fi, struct f_ss_opts, func_inst);
459
460 mutex_lock(&opts->lock);
461 opts->refcnt--;
462 mutex_unlock(&opts->lock);
463
464 usb_free_all_descriptors(f);
465 kfree(func_to_ss(f));
466 }
467
468 /* optionally require specific source/sink data patterns */
469 static int check_read_data(struct f_sourcesink *ss, struct usb_request *req)
470 {
471 unsigned i;
472 u8 *buf = req->buf;
473 struct usb_composite_dev *cdev = ss->function.config->cdev;
474 int max_packet_size = le16_to_cpu(ss->out_ep->desc->wMaxPacketSize);
475
476 if (ss->pattern == 2)
477 return 0;
478
479 for (i = 0; i < req->actual; i++, buf++) {
480 switch (ss->pattern) {
481
482 /* all-zeroes has no synchronization issues */
483 case 0:
484 if (*buf == 0)
485 continue;
486 break;
487
488 /* "mod63" stays in sync with short-terminated transfers,
489 * OR otherwise when host and gadget agree on how large
490 * each usb transfer request should be. Resync is done
491 * with set_interface or set_config. (We *WANT* it to
492 * get quickly out of sync if controllers or their drivers
493 * stutter for any reason, including buffer duplication...)
494 */
495 case 1:
496 if (*buf == (u8)((i % max_packet_size) % 63))
497 continue;
498 break;
499 }
500 ERROR(cdev, "bad OUT byte, buf[%d] = %d\n", i, *buf);
501 usb_ep_set_halt(ss->out_ep);
502 return -EINVAL;
503 }
504 return 0;
505 }
506
507 static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
508 {
509 unsigned i;
510 u8 *buf = req->buf;
511 int max_packet_size = le16_to_cpu(ep->desc->wMaxPacketSize);
512 struct f_sourcesink *ss = ep->driver_data;
513
514 switch (ss->pattern) {
515 case 0:
516 memset(req->buf, 0, req->length);
517 break;
518 case 1:
519 for (i = 0; i < req->length; i++)
520 *buf++ = (u8) ((i % max_packet_size) % 63);
521 break;
522 case 2:
523 break;
524 }
525 }
526
527 static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
528 {
529 struct usb_composite_dev *cdev;
530 struct f_sourcesink *ss = ep->driver_data;
531 int status = req->status;
532
533 /* driver_data will be null if ep has been disabled */
534 if (!ss)
535 return;
536
537 cdev = ss->function.config->cdev;
538
539 switch (status) {
540
541 case 0: /* normal completion? */
542 if (ep == ss->out_ep) {
543 check_read_data(ss, req);
544 if (ss->pattern != 2)
545 memset(req->buf, 0x55, req->length);
546 }
547 break;
548
549 /* this endpoint is normally active while we're configured */
550 case -ECONNABORTED: /* hardware forced ep reset */
551 case -ECONNRESET: /* request dequeued */
552 case -ESHUTDOWN: /* disconnect from host */
553 VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
554 req->actual, req->length);
555 if (ep == ss->out_ep)
556 check_read_data(ss, req);
557 free_ep_req(ep, req);
558 return;
559
560 case -EOVERFLOW: /* buffer overrun on read means that
561 * we didn't provide a big enough
562 * buffer.
563 */
564 default:
565 #if 1
566 DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
567 status, req->actual, req->length);
568 #endif
569 case -EREMOTEIO: /* short read */
570 break;
571 }
572
573 status = usb_ep_queue(ep, req, GFP_ATOMIC);
574 if (status) {
575 ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n",
576 ep->name, req->length, status);
577 usb_ep_set_halt(ep);
578 /* FIXME recover later ... somehow */
579 }
580 }
581
582 static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in,
583 bool is_iso, int speed)
584 {
585 struct usb_ep *ep;
586 struct usb_request *req;
587 int i, size, qlen, status = 0;
588
589 if (is_iso) {
590 switch (speed) {
591 case USB_SPEED_SUPER:
592 size = ss->isoc_maxpacket *
593 (ss->isoc_mult + 1) *
594 (ss->isoc_maxburst + 1);
595 break;
596 case USB_SPEED_HIGH:
597 size = ss->isoc_maxpacket * (ss->isoc_mult + 1);
598 break;
599 default:
600 size = ss->isoc_maxpacket > 1023 ?
601 1023 : ss->isoc_maxpacket;
602 break;
603 }
604 ep = is_in ? ss->iso_in_ep : ss->iso_out_ep;
605 qlen = ss->iso_qlen;
606 } else {
607 ep = is_in ? ss->in_ep : ss->out_ep;
608 qlen = ss->bulk_qlen;
609 size = 0;
610 }
611
612 for (i = 0; i < qlen; i++) {
613 req = ss_alloc_ep_req(ep, size);
614 if (!req)
615 return -ENOMEM;
616
617 req->complete = source_sink_complete;
618 if (is_in)
619 reinit_write_data(ep, req);
620 else if (ss->pattern != 2)
621 memset(req->buf, 0x55, req->length);
622
623 status = usb_ep_queue(ep, req, GFP_ATOMIC);
624 if (status) {
625 struct usb_composite_dev *cdev;
626
627 cdev = ss->function.config->cdev;
628 ERROR(cdev, "start %s%s %s --> %d\n",
629 is_iso ? "ISO-" : "", is_in ? "IN" : "OUT",
630 ep->name, status);
631 free_ep_req(ep, req);
632 return status;
633 }
634 }
635
636 return status;
637 }
638
639 static void disable_source_sink(struct f_sourcesink *ss)
640 {
641 struct usb_composite_dev *cdev;
642
643 cdev = ss->function.config->cdev;
644 disable_endpoints(cdev, ss->in_ep, ss->out_ep, ss->iso_in_ep,
645 ss->iso_out_ep);
646 VDBG(cdev, "%s disabled\n", ss->function.name);
647 }
648
649 static int
650 enable_source_sink(struct usb_composite_dev *cdev, struct f_sourcesink *ss,
651 int alt)
652 {
653 int result = 0;
654 int speed = cdev->gadget->speed;
655 struct usb_ep *ep;
656
657 /* one bulk endpoint writes (sources) zeroes IN (to the host) */
658 ep = ss->in_ep;
659 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
660 if (result)
661 return result;
662 result = usb_ep_enable(ep);
663 if (result < 0)
664 return result;
665 ep->driver_data = ss;
666
667 result = source_sink_start_ep(ss, true, false, speed);
668 if (result < 0) {
669 fail:
670 ep = ss->in_ep;
671 usb_ep_disable(ep);
672 return result;
673 }
674
675 /* one bulk endpoint reads (sinks) anything OUT (from the host) */
676 ep = ss->out_ep;
677 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
678 if (result)
679 goto fail;
680 result = usb_ep_enable(ep);
681 if (result < 0)
682 goto fail;
683 ep->driver_data = ss;
684
685 result = source_sink_start_ep(ss, false, false, speed);
686 if (result < 0) {
687 fail2:
688 ep = ss->out_ep;
689 usb_ep_disable(ep);
690 goto fail;
691 }
692
693 if (alt == 0)
694 goto out;
695
696 /* one iso endpoint writes (sources) zeroes IN (to the host) */
697 ep = ss->iso_in_ep;
698 if (ep) {
699 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
700 if (result)
701 goto fail2;
702 result = usb_ep_enable(ep);
703 if (result < 0)
704 goto fail2;
705 ep->driver_data = ss;
706
707 result = source_sink_start_ep(ss, true, true, speed);
708 if (result < 0) {
709 fail3:
710 ep = ss->iso_in_ep;
711 if (ep)
712 usb_ep_disable(ep);
713 goto fail2;
714 }
715 }
716
717 /* one iso endpoint reads (sinks) anything OUT (from the host) */
718 ep = ss->iso_out_ep;
719 if (ep) {
720 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
721 if (result)
722 goto fail3;
723 result = usb_ep_enable(ep);
724 if (result < 0)
725 goto fail3;
726 ep->driver_data = ss;
727
728 result = source_sink_start_ep(ss, false, true, speed);
729 if (result < 0) {
730 usb_ep_disable(ep);
731 goto fail3;
732 }
733 }
734 out:
735 ss->cur_alt = alt;
736
737 DBG(cdev, "%s enabled, alt intf %d\n", ss->function.name, alt);
738 return result;
739 }
740
741 static int sourcesink_set_alt(struct usb_function *f,
742 unsigned intf, unsigned alt)
743 {
744 struct f_sourcesink *ss = func_to_ss(f);
745 struct usb_composite_dev *cdev = f->config->cdev;
746
747 disable_source_sink(ss);
748 return enable_source_sink(cdev, ss, alt);
749 }
750
751 static int sourcesink_get_alt(struct usb_function *f, unsigned intf)
752 {
753 struct f_sourcesink *ss = func_to_ss(f);
754
755 return ss->cur_alt;
756 }
757
758 static void sourcesink_disable(struct usb_function *f)
759 {
760 struct f_sourcesink *ss = func_to_ss(f);
761
762 disable_source_sink(ss);
763 }
764
765 /*-------------------------------------------------------------------------*/
766
767 static int sourcesink_setup(struct usb_function *f,
768 const struct usb_ctrlrequest *ctrl)
769 {
770 struct usb_configuration *c = f->config;
771 struct usb_request *req = c->cdev->req;
772 int value = -EOPNOTSUPP;
773 u16 w_index = le16_to_cpu(ctrl->wIndex);
774 u16 w_value = le16_to_cpu(ctrl->wValue);
775 u16 w_length = le16_to_cpu(ctrl->wLength);
776
777 req->length = USB_COMP_EP0_BUFSIZ;
778
779 /* composite driver infrastructure handles everything except
780 * the two control test requests.
781 */
782 switch (ctrl->bRequest) {
783
784 /*
785 * These are the same vendor-specific requests supported by
786 * Intel's USB 2.0 compliance test devices. We exceed that
787 * device spec by allowing multiple-packet requests.
788 *
789 * NOTE: the Control-OUT data stays in req->buf ... better
790 * would be copying it into a scratch buffer, so that other
791 * requests may safely intervene.
792 */
793 case 0x5b: /* control WRITE test -- fill the buffer */
794 if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
795 goto unknown;
796 if (w_value || w_index)
797 break;
798 /* just read that many bytes into the buffer */
799 if (w_length > req->length)
800 break;
801 value = w_length;
802 break;
803 case 0x5c: /* control READ test -- return the buffer */
804 if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
805 goto unknown;
806 if (w_value || w_index)
807 break;
808 /* expect those bytes are still in the buffer; send back */
809 if (w_length > req->length)
810 break;
811 value = w_length;
812 break;
813
814 default:
815 unknown:
816 VDBG(c->cdev,
817 "unknown control req%02x.%02x v%04x i%04x l%d\n",
818 ctrl->bRequestType, ctrl->bRequest,
819 w_value, w_index, w_length);
820 }
821
822 /* respond with data transfer or status phase? */
823 if (value >= 0) {
824 VDBG(c->cdev, "source/sink req%02x.%02x v%04x i%04x l%d\n",
825 ctrl->bRequestType, ctrl->bRequest,
826 w_value, w_index, w_length);
827 req->zero = 0;
828 req->length = value;
829 value = usb_ep_queue(c->cdev->gadget->ep0, req, GFP_ATOMIC);
830 if (value < 0)
831 ERROR(c->cdev, "source/sink response, err %d\n",
832 value);
833 }
834
835 /* device either stalls (value < 0) or reports success */
836 return value;
837 }
838
839 static struct usb_function *source_sink_alloc_func(
840 struct usb_function_instance *fi)
841 {
842 struct f_sourcesink *ss;
843 struct f_ss_opts *ss_opts;
844
845 ss = kzalloc(sizeof(*ss), GFP_KERNEL);
846 if (!ss)
847 return NULL;
848
849 ss_opts = container_of(fi, struct f_ss_opts, func_inst);
850
851 mutex_lock(&ss_opts->lock);
852 ss_opts->refcnt++;
853 mutex_unlock(&ss_opts->lock);
854
855 ss->pattern = ss_opts->pattern;
856 ss->isoc_interval = ss_opts->isoc_interval;
857 ss->isoc_maxpacket = ss_opts->isoc_maxpacket;
858 ss->isoc_mult = ss_opts->isoc_mult;
859 ss->isoc_maxburst = ss_opts->isoc_maxburst;
860 ss->buflen = ss_opts->bulk_buflen;
861 ss->bulk_qlen = ss_opts->bulk_qlen;
862 ss->iso_qlen = ss_opts->iso_qlen;
863
864 ss->function.name = "source/sink";
865 ss->function.bind = sourcesink_bind;
866 ss->function.set_alt = sourcesink_set_alt;
867 ss->function.get_alt = sourcesink_get_alt;
868 ss->function.disable = sourcesink_disable;
869 ss->function.setup = sourcesink_setup;
870 ss->function.strings = sourcesink_strings;
871
872 ss->function.free_func = sourcesink_free_func;
873
874 return &ss->function;
875 }
876
877 static inline struct f_ss_opts *to_f_ss_opts(struct config_item *item)
878 {
879 return container_of(to_config_group(item), struct f_ss_opts,
880 func_inst.group);
881 }
882
883 static void ss_attr_release(struct config_item *item)
884 {
885 struct f_ss_opts *ss_opts = to_f_ss_opts(item);
886
887 usb_put_function_instance(&ss_opts->func_inst);
888 }
889
890 static struct configfs_item_operations ss_item_ops = {
891 .release = ss_attr_release,
892 };
893
894 static ssize_t f_ss_opts_pattern_show(struct config_item *item, char *page)
895 {
896 struct f_ss_opts *opts = to_f_ss_opts(item);
897 int result;
898
899 mutex_lock(&opts->lock);
900 result = sprintf(page, "%u\n", opts->pattern);
901 mutex_unlock(&opts->lock);
902
903 return result;
904 }
905
906 static ssize_t f_ss_opts_pattern_store(struct config_item *item,
907 const char *page, size_t len)
908 {
909 struct f_ss_opts *opts = to_f_ss_opts(item);
910 int ret;
911 u8 num;
912
913 mutex_lock(&opts->lock);
914 if (opts->refcnt) {
915 ret = -EBUSY;
916 goto end;
917 }
918
919 ret = kstrtou8(page, 0, &num);
920 if (ret)
921 goto end;
922
923 if (num != 0 && num != 1 && num != 2) {
924 ret = -EINVAL;
925 goto end;
926 }
927
928 opts->pattern = num;
929 ret = len;
930 end:
931 mutex_unlock(&opts->lock);
932 return ret;
933 }
934
935 CONFIGFS_ATTR(f_ss_opts_, pattern);
936
937 static ssize_t f_ss_opts_isoc_interval_show(struct config_item *item, char *page)
938 {
939 struct f_ss_opts *opts = to_f_ss_opts(item);
940 int result;
941
942 mutex_lock(&opts->lock);
943 result = sprintf(page, "%u\n", opts->isoc_interval);
944 mutex_unlock(&opts->lock);
945
946 return result;
947 }
948
949 static ssize_t f_ss_opts_isoc_interval_store(struct config_item *item,
950 const char *page, size_t len)
951 {
952 struct f_ss_opts *opts = to_f_ss_opts(item);
953 int ret;
954 u8 num;
955
956 mutex_lock(&opts->lock);
957 if (opts->refcnt) {
958 ret = -EBUSY;
959 goto end;
960 }
961
962 ret = kstrtou8(page, 0, &num);
963 if (ret)
964 goto end;
965
966 if (num > 16) {
967 ret = -EINVAL;
968 goto end;
969 }
970
971 opts->isoc_interval = num;
972 ret = len;
973 end:
974 mutex_unlock(&opts->lock);
975 return ret;
976 }
977
978 CONFIGFS_ATTR(f_ss_opts_, isoc_interval);
979
980 static ssize_t f_ss_opts_isoc_maxpacket_show(struct config_item *item, char *page)
981 {
982 struct f_ss_opts *opts = to_f_ss_opts(item);
983 int result;
984
985 mutex_lock(&opts->lock);
986 result = sprintf(page, "%u\n", opts->isoc_maxpacket);
987 mutex_unlock(&opts->lock);
988
989 return result;
990 }
991
992 static ssize_t f_ss_opts_isoc_maxpacket_store(struct config_item *item,
993 const char *page, size_t len)
994 {
995 struct f_ss_opts *opts = to_f_ss_opts(item);
996 int ret;
997 u16 num;
998
999 mutex_lock(&opts->lock);
1000 if (opts->refcnt) {
1001 ret = -EBUSY;
1002 goto end;
1003 }
1004
1005 ret = kstrtou16(page, 0, &num);
1006 if (ret)
1007 goto end;
1008
1009 if (num > 1024) {
1010 ret = -EINVAL;
1011 goto end;
1012 }
1013
1014 opts->isoc_maxpacket = num;
1015 ret = len;
1016 end:
1017 mutex_unlock(&opts->lock);
1018 return ret;
1019 }
1020
1021 CONFIGFS_ATTR(f_ss_opts_, isoc_maxpacket);
1022
1023 static ssize_t f_ss_opts_isoc_mult_show(struct config_item *item, char *page)
1024 {
1025 struct f_ss_opts *opts = to_f_ss_opts(item);
1026 int result;
1027
1028 mutex_lock(&opts->lock);
1029 result = sprintf(page, "%u\n", opts->isoc_mult);
1030 mutex_unlock(&opts->lock);
1031
1032 return result;
1033 }
1034
1035 static ssize_t f_ss_opts_isoc_mult_store(struct config_item *item,
1036 const char *page, size_t len)
1037 {
1038 struct f_ss_opts *opts = to_f_ss_opts(item);
1039 int ret;
1040 u8 num;
1041
1042 mutex_lock(&opts->lock);
1043 if (opts->refcnt) {
1044 ret = -EBUSY;
1045 goto end;
1046 }
1047
1048 ret = kstrtou8(page, 0, &num);
1049 if (ret)
1050 goto end;
1051
1052 if (num > 2) {
1053 ret = -EINVAL;
1054 goto end;
1055 }
1056
1057 opts->isoc_mult = num;
1058 ret = len;
1059 end:
1060 mutex_unlock(&opts->lock);
1061 return ret;
1062 }
1063
1064 CONFIGFS_ATTR(f_ss_opts_, isoc_mult);
1065
1066 static ssize_t f_ss_opts_isoc_maxburst_show(struct config_item *item, char *page)
1067 {
1068 struct f_ss_opts *opts = to_f_ss_opts(item);
1069 int result;
1070
1071 mutex_lock(&opts->lock);
1072 result = sprintf(page, "%u\n", opts->isoc_maxburst);
1073 mutex_unlock(&opts->lock);
1074
1075 return result;
1076 }
1077
1078 static ssize_t f_ss_opts_isoc_maxburst_store(struct config_item *item,
1079 const char *page, size_t len)
1080 {
1081 struct f_ss_opts *opts = to_f_ss_opts(item);
1082 int ret;
1083 u8 num;
1084
1085 mutex_lock(&opts->lock);
1086 if (opts->refcnt) {
1087 ret = -EBUSY;
1088 goto end;
1089 }
1090
1091 ret = kstrtou8(page, 0, &num);
1092 if (ret)
1093 goto end;
1094
1095 if (num > 15) {
1096 ret = -EINVAL;
1097 goto end;
1098 }
1099
1100 opts->isoc_maxburst = num;
1101 ret = len;
1102 end:
1103 mutex_unlock(&opts->lock);
1104 return ret;
1105 }
1106
1107 CONFIGFS_ATTR(f_ss_opts_, isoc_maxburst);
1108
1109 static ssize_t f_ss_opts_bulk_buflen_show(struct config_item *item, char *page)
1110 {
1111 struct f_ss_opts *opts = to_f_ss_opts(item);
1112 int result;
1113
1114 mutex_lock(&opts->lock);
1115 result = sprintf(page, "%u\n", opts->bulk_buflen);
1116 mutex_unlock(&opts->lock);
1117
1118 return result;
1119 }
1120
1121 static ssize_t f_ss_opts_bulk_buflen_store(struct config_item *item,
1122 const char *page, size_t len)
1123 {
1124 struct f_ss_opts *opts = to_f_ss_opts(item);
1125 int ret;
1126 u32 num;
1127
1128 mutex_lock(&opts->lock);
1129 if (opts->refcnt) {
1130 ret = -EBUSY;
1131 goto end;
1132 }
1133
1134 ret = kstrtou32(page, 0, &num);
1135 if (ret)
1136 goto end;
1137
1138 opts->bulk_buflen = num;
1139 ret = len;
1140 end:
1141 mutex_unlock(&opts->lock);
1142 return ret;
1143 }
1144
1145 CONFIGFS_ATTR(f_ss_opts_, bulk_buflen);
1146
1147 static ssize_t f_ss_opts_bulk_qlen_show(struct config_item *item, char *page)
1148 {
1149 struct f_ss_opts *opts = to_f_ss_opts(item);
1150 int result;
1151
1152 mutex_lock(&opts->lock);
1153 result = sprintf(page, "%u\n", opts->bulk_qlen);
1154 mutex_unlock(&opts->lock);
1155
1156 return result;
1157 }
1158
1159 static ssize_t f_ss_opts_bulk_qlen_store(struct config_item *item,
1160 const char *page, size_t len)
1161 {
1162 struct f_ss_opts *opts = to_f_ss_opts(item);
1163 int ret;
1164 u32 num;
1165
1166 mutex_lock(&opts->lock);
1167 if (opts->refcnt) {
1168 ret = -EBUSY;
1169 goto end;
1170 }
1171
1172 ret = kstrtou32(page, 0, &num);
1173 if (ret)
1174 goto end;
1175
1176 opts->bulk_qlen = num;
1177 ret = len;
1178 end:
1179 mutex_unlock(&opts->lock);
1180 return ret;
1181 }
1182
1183 CONFIGFS_ATTR(f_ss_opts_, bulk_qlen);
1184
1185 static ssize_t f_ss_opts_iso_qlen_show(struct config_item *item, char *page)
1186 {
1187 struct f_ss_opts *opts = to_f_ss_opts(item);
1188 int result;
1189
1190 mutex_lock(&opts->lock);
1191 result = sprintf(page, "%u\n", opts->iso_qlen);
1192 mutex_unlock(&opts->lock);
1193
1194 return result;
1195 }
1196
1197 static ssize_t f_ss_opts_iso_qlen_store(struct config_item *item,
1198 const char *page, size_t len)
1199 {
1200 struct f_ss_opts *opts = to_f_ss_opts(item);
1201 int ret;
1202 u32 num;
1203
1204 mutex_lock(&opts->lock);
1205 if (opts->refcnt) {
1206 ret = -EBUSY;
1207 goto end;
1208 }
1209
1210 ret = kstrtou32(page, 0, &num);
1211 if (ret)
1212 goto end;
1213
1214 opts->iso_qlen = num;
1215 ret = len;
1216 end:
1217 mutex_unlock(&opts->lock);
1218 return ret;
1219 }
1220
1221 CONFIGFS_ATTR(f_ss_opts_, iso_qlen);
1222
1223 static struct configfs_attribute *ss_attrs[] = {
1224 &f_ss_opts_attr_pattern,
1225 &f_ss_opts_attr_isoc_interval,
1226 &f_ss_opts_attr_isoc_maxpacket,
1227 &f_ss_opts_attr_isoc_mult,
1228 &f_ss_opts_attr_isoc_maxburst,
1229 &f_ss_opts_attr_bulk_buflen,
1230 &f_ss_opts_attr_bulk_qlen,
1231 &f_ss_opts_attr_iso_qlen,
1232 NULL,
1233 };
1234
1235 static struct config_item_type ss_func_type = {
1236 .ct_item_ops = &ss_item_ops,
1237 .ct_attrs = ss_attrs,
1238 .ct_owner = THIS_MODULE,
1239 };
1240
1241 static void source_sink_free_instance(struct usb_function_instance *fi)
1242 {
1243 struct f_ss_opts *ss_opts;
1244
1245 ss_opts = container_of(fi, struct f_ss_opts, func_inst);
1246 kfree(ss_opts);
1247 }
1248
1249 static struct usb_function_instance *source_sink_alloc_inst(void)
1250 {
1251 struct f_ss_opts *ss_opts;
1252
1253 ss_opts = kzalloc(sizeof(*ss_opts), GFP_KERNEL);
1254 if (!ss_opts)
1255 return ERR_PTR(-ENOMEM);
1256 mutex_init(&ss_opts->lock);
1257 ss_opts->func_inst.free_func_inst = source_sink_free_instance;
1258 ss_opts->isoc_interval = GZERO_ISOC_INTERVAL;
1259 ss_opts->isoc_maxpacket = GZERO_ISOC_MAXPACKET;
1260 ss_opts->bulk_buflen = GZERO_BULK_BUFLEN;
1261 ss_opts->bulk_qlen = GZERO_SS_BULK_QLEN;
1262 ss_opts->iso_qlen = GZERO_SS_ISO_QLEN;
1263
1264 config_group_init_type_name(&ss_opts->func_inst.group, "",
1265 &ss_func_type);
1266
1267 return &ss_opts->func_inst;
1268 }
1269 DECLARE_USB_FUNCTION(SourceSink, source_sink_alloc_inst,
1270 source_sink_alloc_func);
1271
1272 static int __init sslb_modinit(void)
1273 {
1274 int ret;
1275
1276 ret = usb_function_register(&SourceSinkusb_func);
1277 if (ret)
1278 return ret;
1279 ret = lb_modinit();
1280 if (ret)
1281 usb_function_unregister(&SourceSinkusb_func);
1282 return ret;
1283 }
1284 static void __exit sslb_modexit(void)
1285 {
1286 usb_function_unregister(&SourceSinkusb_func);
1287 lb_modexit();
1288 }
1289 module_init(sslb_modinit);
1290 module_exit(sslb_modexit);
1291
1292 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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