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Merge tag 'iio-fixes-for-4.0c' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[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 "gadget_chips.h"
24 #include "u_f.h"
25
26 /*
27 * SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripheral
28 * controller drivers.
29 *
30 * This just sinks bulk packets OUT to the peripheral and sources them IN
31 * to the host, optionally with specific data patterns for integrity tests.
32 * As such it supports basic functionality and load tests.
33 *
34 * In terms of control messaging, this supports all the standard requests
35 * plus two that support control-OUT tests. If the optional "autoresume"
36 * mode is enabled, it provides good functional coverage for the "USBCV"
37 * test harness from USB-IF.
38 *
39 * Note that because this doesn't queue more than one request at a time,
40 * some other function must be used to test queueing logic. The network
41 * link (g_ether) is the best overall option for that, since its TX and RX
42 * queues are relatively independent, will receive a range of packet sizes,
43 * and can often be made to run out completely. Those issues are important
44 * when stress testing peripheral controller drivers.
45 *
46 *
47 * This is currently packaged as a configuration driver, which can't be
48 * combined with other functions to make composite devices. However, it
49 * can be combined with other independent configurations.
50 */
51 struct f_sourcesink {
52 struct usb_function function;
53
54 struct usb_ep *in_ep;
55 struct usb_ep *out_ep;
56 struct usb_ep *iso_in_ep;
57 struct usb_ep *iso_out_ep;
58 int cur_alt;
59 };
60
61 static inline struct f_sourcesink *func_to_ss(struct usb_function *f)
62 {
63 return container_of(f, struct f_sourcesink, function);
64 }
65
66 static unsigned pattern;
67 static unsigned isoc_interval;
68 static unsigned isoc_maxpacket;
69 static unsigned isoc_mult;
70 static unsigned isoc_maxburst;
71 static unsigned buflen;
72
73 /*-------------------------------------------------------------------------*/
74
75 static struct usb_interface_descriptor source_sink_intf_alt0 = {
76 .bLength = USB_DT_INTERFACE_SIZE,
77 .bDescriptorType = USB_DT_INTERFACE,
78
79 .bAlternateSetting = 0,
80 .bNumEndpoints = 2,
81 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
82 /* .iInterface = DYNAMIC */
83 };
84
85 static struct usb_interface_descriptor source_sink_intf_alt1 = {
86 .bLength = USB_DT_INTERFACE_SIZE,
87 .bDescriptorType = USB_DT_INTERFACE,
88
89 .bAlternateSetting = 1,
90 .bNumEndpoints = 4,
91 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
92 /* .iInterface = DYNAMIC */
93 };
94
95 /* full speed support: */
96
97 static struct usb_endpoint_descriptor fs_source_desc = {
98 .bLength = USB_DT_ENDPOINT_SIZE,
99 .bDescriptorType = USB_DT_ENDPOINT,
100
101 .bEndpointAddress = USB_DIR_IN,
102 .bmAttributes = USB_ENDPOINT_XFER_BULK,
103 };
104
105 static struct usb_endpoint_descriptor fs_sink_desc = {
106 .bLength = USB_DT_ENDPOINT_SIZE,
107 .bDescriptorType = USB_DT_ENDPOINT,
108
109 .bEndpointAddress = USB_DIR_OUT,
110 .bmAttributes = USB_ENDPOINT_XFER_BULK,
111 };
112
113 static struct usb_endpoint_descriptor fs_iso_source_desc = {
114 .bLength = USB_DT_ENDPOINT_SIZE,
115 .bDescriptorType = USB_DT_ENDPOINT,
116
117 .bEndpointAddress = USB_DIR_IN,
118 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
119 .wMaxPacketSize = cpu_to_le16(1023),
120 .bInterval = 4,
121 };
122
123 static struct usb_endpoint_descriptor fs_iso_sink_desc = {
124 .bLength = USB_DT_ENDPOINT_SIZE,
125 .bDescriptorType = USB_DT_ENDPOINT,
126
127 .bEndpointAddress = USB_DIR_OUT,
128 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
129 .wMaxPacketSize = cpu_to_le16(1023),
130 .bInterval = 4,
131 };
132
133 static struct usb_descriptor_header *fs_source_sink_descs[] = {
134 (struct usb_descriptor_header *) &source_sink_intf_alt0,
135 (struct usb_descriptor_header *) &fs_sink_desc,
136 (struct usb_descriptor_header *) &fs_source_desc,
137 (struct usb_descriptor_header *) &source_sink_intf_alt1,
138 #define FS_ALT_IFC_1_OFFSET 3
139 (struct usb_descriptor_header *) &fs_sink_desc,
140 (struct usb_descriptor_header *) &fs_source_desc,
141 (struct usb_descriptor_header *) &fs_iso_sink_desc,
142 (struct usb_descriptor_header *) &fs_iso_source_desc,
143 NULL,
144 };
145
146 /* high speed support: */
147
148 static struct usb_endpoint_descriptor hs_source_desc = {
149 .bLength = USB_DT_ENDPOINT_SIZE,
150 .bDescriptorType = USB_DT_ENDPOINT,
151
152 .bmAttributes = USB_ENDPOINT_XFER_BULK,
153 .wMaxPacketSize = cpu_to_le16(512),
154 };
155
156 static struct usb_endpoint_descriptor hs_sink_desc = {
157 .bLength = USB_DT_ENDPOINT_SIZE,
158 .bDescriptorType = USB_DT_ENDPOINT,
159
160 .bmAttributes = USB_ENDPOINT_XFER_BULK,
161 .wMaxPacketSize = cpu_to_le16(512),
162 };
163
164 static struct usb_endpoint_descriptor hs_iso_source_desc = {
165 .bLength = USB_DT_ENDPOINT_SIZE,
166 .bDescriptorType = USB_DT_ENDPOINT,
167
168 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
169 .wMaxPacketSize = cpu_to_le16(1024),
170 .bInterval = 4,
171 };
172
173 static struct usb_endpoint_descriptor hs_iso_sink_desc = {
174 .bLength = USB_DT_ENDPOINT_SIZE,
175 .bDescriptorType = USB_DT_ENDPOINT,
176
177 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
178 .wMaxPacketSize = cpu_to_le16(1024),
179 .bInterval = 4,
180 };
181
182 static struct usb_descriptor_header *hs_source_sink_descs[] = {
183 (struct usb_descriptor_header *) &source_sink_intf_alt0,
184 (struct usb_descriptor_header *) &hs_source_desc,
185 (struct usb_descriptor_header *) &hs_sink_desc,
186 (struct usb_descriptor_header *) &source_sink_intf_alt1,
187 #define HS_ALT_IFC_1_OFFSET 3
188 (struct usb_descriptor_header *) &hs_source_desc,
189 (struct usb_descriptor_header *) &hs_sink_desc,
190 (struct usb_descriptor_header *) &hs_iso_source_desc,
191 (struct usb_descriptor_header *) &hs_iso_sink_desc,
192 NULL,
193 };
194
195 /* super speed support: */
196
197 static struct usb_endpoint_descriptor ss_source_desc = {
198 .bLength = USB_DT_ENDPOINT_SIZE,
199 .bDescriptorType = USB_DT_ENDPOINT,
200
201 .bmAttributes = USB_ENDPOINT_XFER_BULK,
202 .wMaxPacketSize = cpu_to_le16(1024),
203 };
204
205 static struct usb_ss_ep_comp_descriptor ss_source_comp_desc = {
206 .bLength = USB_DT_SS_EP_COMP_SIZE,
207 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
208
209 .bMaxBurst = 0,
210 .bmAttributes = 0,
211 .wBytesPerInterval = 0,
212 };
213
214 static struct usb_endpoint_descriptor ss_sink_desc = {
215 .bLength = USB_DT_ENDPOINT_SIZE,
216 .bDescriptorType = USB_DT_ENDPOINT,
217
218 .bmAttributes = USB_ENDPOINT_XFER_BULK,
219 .wMaxPacketSize = cpu_to_le16(1024),
220 };
221
222 static struct usb_ss_ep_comp_descriptor ss_sink_comp_desc = {
223 .bLength = USB_DT_SS_EP_COMP_SIZE,
224 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
225
226 .bMaxBurst = 0,
227 .bmAttributes = 0,
228 .wBytesPerInterval = 0,
229 };
230
231 static struct usb_endpoint_descriptor ss_iso_source_desc = {
232 .bLength = USB_DT_ENDPOINT_SIZE,
233 .bDescriptorType = USB_DT_ENDPOINT,
234
235 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
236 .wMaxPacketSize = cpu_to_le16(1024),
237 .bInterval = 4,
238 };
239
240 static struct usb_ss_ep_comp_descriptor ss_iso_source_comp_desc = {
241 .bLength = USB_DT_SS_EP_COMP_SIZE,
242 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
243
244 .bMaxBurst = 0,
245 .bmAttributes = 0,
246 .wBytesPerInterval = cpu_to_le16(1024),
247 };
248
249 static struct usb_endpoint_descriptor ss_iso_sink_desc = {
250 .bLength = USB_DT_ENDPOINT_SIZE,
251 .bDescriptorType = USB_DT_ENDPOINT,
252
253 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
254 .wMaxPacketSize = cpu_to_le16(1024),
255 .bInterval = 4,
256 };
257
258 static struct usb_ss_ep_comp_descriptor ss_iso_sink_comp_desc = {
259 .bLength = USB_DT_SS_EP_COMP_SIZE,
260 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
261
262 .bMaxBurst = 0,
263 .bmAttributes = 0,
264 .wBytesPerInterval = cpu_to_le16(1024),
265 };
266
267 static struct usb_descriptor_header *ss_source_sink_descs[] = {
268 (struct usb_descriptor_header *) &source_sink_intf_alt0,
269 (struct usb_descriptor_header *) &ss_source_desc,
270 (struct usb_descriptor_header *) &ss_source_comp_desc,
271 (struct usb_descriptor_header *) &ss_sink_desc,
272 (struct usb_descriptor_header *) &ss_sink_comp_desc,
273 (struct usb_descriptor_header *) &source_sink_intf_alt1,
274 #define SS_ALT_IFC_1_OFFSET 5
275 (struct usb_descriptor_header *) &ss_source_desc,
276 (struct usb_descriptor_header *) &ss_source_comp_desc,
277 (struct usb_descriptor_header *) &ss_sink_desc,
278 (struct usb_descriptor_header *) &ss_sink_comp_desc,
279 (struct usb_descriptor_header *) &ss_iso_source_desc,
280 (struct usb_descriptor_header *) &ss_iso_source_comp_desc,
281 (struct usb_descriptor_header *) &ss_iso_sink_desc,
282 (struct usb_descriptor_header *) &ss_iso_sink_comp_desc,
283 NULL,
284 };
285
286 /* function-specific strings: */
287
288 static struct usb_string strings_sourcesink[] = {
289 [0].s = "source and sink data",
290 { } /* end of list */
291 };
292
293 static struct usb_gadget_strings stringtab_sourcesink = {
294 .language = 0x0409, /* en-us */
295 .strings = strings_sourcesink,
296 };
297
298 static struct usb_gadget_strings *sourcesink_strings[] = {
299 &stringtab_sourcesink,
300 NULL,
301 };
302
303 /*-------------------------------------------------------------------------*/
304
305 static inline struct usb_request *ss_alloc_ep_req(struct usb_ep *ep, int len)
306 {
307 return alloc_ep_req(ep, len, buflen);
308 }
309
310 void free_ep_req(struct usb_ep *ep, struct usb_request *req)
311 {
312 kfree(req->buf);
313 usb_ep_free_request(ep, req);
314 }
315
316 static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
317 {
318 int value;
319
320 if (ep->driver_data) {
321 value = usb_ep_disable(ep);
322 if (value < 0)
323 DBG(cdev, "disable %s --> %d\n",
324 ep->name, value);
325 ep->driver_data = NULL;
326 }
327 }
328
329 void disable_endpoints(struct usb_composite_dev *cdev,
330 struct usb_ep *in, struct usb_ep *out,
331 struct usb_ep *iso_in, struct usb_ep *iso_out)
332 {
333 disable_ep(cdev, in);
334 disable_ep(cdev, out);
335 if (iso_in)
336 disable_ep(cdev, iso_in);
337 if (iso_out)
338 disable_ep(cdev, iso_out);
339 }
340
341 static int
342 sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
343 {
344 struct usb_composite_dev *cdev = c->cdev;
345 struct f_sourcesink *ss = func_to_ss(f);
346 int id;
347 int ret;
348
349 /* allocate interface ID(s) */
350 id = usb_interface_id(c, f);
351 if (id < 0)
352 return id;
353 source_sink_intf_alt0.bInterfaceNumber = id;
354 source_sink_intf_alt1.bInterfaceNumber = id;
355
356 /* allocate bulk endpoints */
357 ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
358 if (!ss->in_ep) {
359 autoconf_fail:
360 ERROR(cdev, "%s: can't autoconfigure on %s\n",
361 f->name, cdev->gadget->name);
362 return -ENODEV;
363 }
364 ss->in_ep->driver_data = cdev; /* claim */
365
366 ss->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
367 if (!ss->out_ep)
368 goto autoconf_fail;
369 ss->out_ep->driver_data = cdev; /* claim */
370
371 /* sanity check the isoc module parameters */
372 if (isoc_interval < 1)
373 isoc_interval = 1;
374 if (isoc_interval > 16)
375 isoc_interval = 16;
376 if (isoc_mult > 2)
377 isoc_mult = 2;
378 if (isoc_maxburst > 15)
379 isoc_maxburst = 15;
380
381 /* fill in the FS isoc descriptors from the module parameters */
382 fs_iso_source_desc.wMaxPacketSize = isoc_maxpacket > 1023 ?
383 1023 : isoc_maxpacket;
384 fs_iso_source_desc.bInterval = isoc_interval;
385 fs_iso_sink_desc.wMaxPacketSize = isoc_maxpacket > 1023 ?
386 1023 : isoc_maxpacket;
387 fs_iso_sink_desc.bInterval = isoc_interval;
388
389 /* allocate iso endpoints */
390 ss->iso_in_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_source_desc);
391 if (!ss->iso_in_ep)
392 goto no_iso;
393 ss->iso_in_ep->driver_data = cdev; /* claim */
394
395 ss->iso_out_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_sink_desc);
396 if (ss->iso_out_ep) {
397 ss->iso_out_ep->driver_data = cdev; /* claim */
398 } else {
399 ss->iso_in_ep->driver_data = NULL;
400 ss->iso_in_ep = NULL;
401 no_iso:
402 /*
403 * We still want to work even if the UDC doesn't have isoc
404 * endpoints, so null out the alt interface that contains
405 * them and continue.
406 */
407 fs_source_sink_descs[FS_ALT_IFC_1_OFFSET] = NULL;
408 hs_source_sink_descs[HS_ALT_IFC_1_OFFSET] = NULL;
409 ss_source_sink_descs[SS_ALT_IFC_1_OFFSET] = NULL;
410 }
411
412 if (isoc_maxpacket > 1024)
413 isoc_maxpacket = 1024;
414
415 /* support high speed hardware */
416 hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
417 hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
418
419 /*
420 * Fill in the HS isoc descriptors from the module parameters.
421 * We assume that the user knows what they are doing and won't
422 * give parameters that their UDC doesn't support.
423 */
424 hs_iso_source_desc.wMaxPacketSize = isoc_maxpacket;
425 hs_iso_source_desc.wMaxPacketSize |= isoc_mult << 11;
426 hs_iso_source_desc.bInterval = isoc_interval;
427 hs_iso_source_desc.bEndpointAddress =
428 fs_iso_source_desc.bEndpointAddress;
429
430 hs_iso_sink_desc.wMaxPacketSize = isoc_maxpacket;
431 hs_iso_sink_desc.wMaxPacketSize |= isoc_mult << 11;
432 hs_iso_sink_desc.bInterval = isoc_interval;
433 hs_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
434
435 /* support super speed hardware */
436 ss_source_desc.bEndpointAddress =
437 fs_source_desc.bEndpointAddress;
438 ss_sink_desc.bEndpointAddress =
439 fs_sink_desc.bEndpointAddress;
440
441 /*
442 * Fill in the SS isoc descriptors from the module parameters.
443 * We assume that the user knows what they are doing and won't
444 * give parameters that their UDC doesn't support.
445 */
446 ss_iso_source_desc.wMaxPacketSize = isoc_maxpacket;
447 ss_iso_source_desc.bInterval = isoc_interval;
448 ss_iso_source_comp_desc.bmAttributes = isoc_mult;
449 ss_iso_source_comp_desc.bMaxBurst = isoc_maxburst;
450 ss_iso_source_comp_desc.wBytesPerInterval =
451 isoc_maxpacket * (isoc_mult + 1) * (isoc_maxburst + 1);
452 ss_iso_source_desc.bEndpointAddress =
453 fs_iso_source_desc.bEndpointAddress;
454
455 ss_iso_sink_desc.wMaxPacketSize = isoc_maxpacket;
456 ss_iso_sink_desc.bInterval = isoc_interval;
457 ss_iso_sink_comp_desc.bmAttributes = isoc_mult;
458 ss_iso_sink_comp_desc.bMaxBurst = isoc_maxburst;
459 ss_iso_sink_comp_desc.wBytesPerInterval =
460 isoc_maxpacket * (isoc_mult + 1) * (isoc_maxburst + 1);
461 ss_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
462
463 ret = usb_assign_descriptors(f, fs_source_sink_descs,
464 hs_source_sink_descs, ss_source_sink_descs);
465 if (ret)
466 return ret;
467
468 DBG(cdev, "%s speed %s: IN/%s, OUT/%s, ISO-IN/%s, ISO-OUT/%s\n",
469 (gadget_is_superspeed(c->cdev->gadget) ? "super" :
470 (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")),
471 f->name, ss->in_ep->name, ss->out_ep->name,
472 ss->iso_in_ep ? ss->iso_in_ep->name : "<none>",
473 ss->iso_out_ep ? ss->iso_out_ep->name : "<none>");
474 return 0;
475 }
476
477 static void
478 sourcesink_free_func(struct usb_function *f)
479 {
480 struct f_ss_opts *opts;
481
482 opts = container_of(f->fi, struct f_ss_opts, func_inst);
483
484 mutex_lock(&opts->lock);
485 opts->refcnt--;
486 mutex_unlock(&opts->lock);
487
488 usb_free_all_descriptors(f);
489 kfree(func_to_ss(f));
490 }
491
492 /* optionally require specific source/sink data patterns */
493 static int check_read_data(struct f_sourcesink *ss, struct usb_request *req)
494 {
495 unsigned i;
496 u8 *buf = req->buf;
497 struct usb_composite_dev *cdev = ss->function.config->cdev;
498
499 if (pattern == 2)
500 return 0;
501
502 for (i = 0; i < req->actual; i++, buf++) {
503 switch (pattern) {
504
505 /* all-zeroes has no synchronization issues */
506 case 0:
507 if (*buf == 0)
508 continue;
509 break;
510
511 /* "mod63" stays in sync with short-terminated transfers,
512 * OR otherwise when host and gadget agree on how large
513 * each usb transfer request should be. Resync is done
514 * with set_interface or set_config. (We *WANT* it to
515 * get quickly out of sync if controllers or their drivers
516 * stutter for any reason, including buffer duplication...)
517 */
518 case 1:
519 if (*buf == (u8)(i % 63))
520 continue;
521 break;
522 }
523 ERROR(cdev, "bad OUT byte, buf[%d] = %d\n", i, *buf);
524 usb_ep_set_halt(ss->out_ep);
525 return -EINVAL;
526 }
527 return 0;
528 }
529
530 static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
531 {
532 unsigned i;
533 u8 *buf = req->buf;
534
535 switch (pattern) {
536 case 0:
537 memset(req->buf, 0, req->length);
538 break;
539 case 1:
540 for (i = 0; i < req->length; i++)
541 *buf++ = (u8) (i % 63);
542 break;
543 case 2:
544 break;
545 }
546 }
547
548 static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
549 {
550 struct usb_composite_dev *cdev;
551 struct f_sourcesink *ss = ep->driver_data;
552 int status = req->status;
553
554 /* driver_data will be null if ep has been disabled */
555 if (!ss)
556 return;
557
558 cdev = ss->function.config->cdev;
559
560 switch (status) {
561
562 case 0: /* normal completion? */
563 if (ep == ss->out_ep) {
564 check_read_data(ss, req);
565 if (pattern != 2)
566 memset(req->buf, 0x55, req->length);
567 }
568 break;
569
570 /* this endpoint is normally active while we're configured */
571 case -ECONNABORTED: /* hardware forced ep reset */
572 case -ECONNRESET: /* request dequeued */
573 case -ESHUTDOWN: /* disconnect from host */
574 VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
575 req->actual, req->length);
576 if (ep == ss->out_ep)
577 check_read_data(ss, req);
578 free_ep_req(ep, req);
579 return;
580
581 case -EOVERFLOW: /* buffer overrun on read means that
582 * we didn't provide a big enough
583 * buffer.
584 */
585 default:
586 #if 1
587 DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
588 status, req->actual, req->length);
589 #endif
590 case -EREMOTEIO: /* short read */
591 break;
592 }
593
594 status = usb_ep_queue(ep, req, GFP_ATOMIC);
595 if (status) {
596 ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n",
597 ep->name, req->length, status);
598 usb_ep_set_halt(ep);
599 /* FIXME recover later ... somehow */
600 }
601 }
602
603 static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in,
604 bool is_iso, int speed)
605 {
606 struct usb_ep *ep;
607 struct usb_request *req;
608 int i, size, status;
609
610 for (i = 0; i < 8; i++) {
611 if (is_iso) {
612 switch (speed) {
613 case USB_SPEED_SUPER:
614 size = isoc_maxpacket * (isoc_mult + 1) *
615 (isoc_maxburst + 1);
616 break;
617 case USB_SPEED_HIGH:
618 size = isoc_maxpacket * (isoc_mult + 1);
619 break;
620 default:
621 size = isoc_maxpacket > 1023 ?
622 1023 : isoc_maxpacket;
623 break;
624 }
625 ep = is_in ? ss->iso_in_ep : ss->iso_out_ep;
626 req = ss_alloc_ep_req(ep, size);
627 } else {
628 ep = is_in ? ss->in_ep : ss->out_ep;
629 req = ss_alloc_ep_req(ep, 0);
630 }
631
632 if (!req)
633 return -ENOMEM;
634
635 req->complete = source_sink_complete;
636 if (is_in)
637 reinit_write_data(ep, req);
638 else if (pattern != 2)
639 memset(req->buf, 0x55, req->length);
640
641 status = usb_ep_queue(ep, req, GFP_ATOMIC);
642 if (status) {
643 struct usb_composite_dev *cdev;
644
645 cdev = ss->function.config->cdev;
646 ERROR(cdev, "start %s%s %s --> %d\n",
647 is_iso ? "ISO-" : "", is_in ? "IN" : "OUT",
648 ep->name, status);
649 free_ep_req(ep, req);
650 }
651
652 if (!is_iso)
653 break;
654 }
655
656 return status;
657 }
658
659 static void disable_source_sink(struct f_sourcesink *ss)
660 {
661 struct usb_composite_dev *cdev;
662
663 cdev = ss->function.config->cdev;
664 disable_endpoints(cdev, ss->in_ep, ss->out_ep, ss->iso_in_ep,
665 ss->iso_out_ep);
666 VDBG(cdev, "%s disabled\n", ss->function.name);
667 }
668
669 static int
670 enable_source_sink(struct usb_composite_dev *cdev, struct f_sourcesink *ss,
671 int alt)
672 {
673 int result = 0;
674 int speed = cdev->gadget->speed;
675 struct usb_ep *ep;
676
677 /* one bulk endpoint writes (sources) zeroes IN (to the host) */
678 ep = ss->in_ep;
679 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
680 if (result)
681 return result;
682 result = usb_ep_enable(ep);
683 if (result < 0)
684 return result;
685 ep->driver_data = ss;
686
687 result = source_sink_start_ep(ss, true, false, speed);
688 if (result < 0) {
689 fail:
690 ep = ss->in_ep;
691 usb_ep_disable(ep);
692 ep->driver_data = NULL;
693 return result;
694 }
695
696 /* one bulk endpoint reads (sinks) anything OUT (from the host) */
697 ep = ss->out_ep;
698 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
699 if (result)
700 goto fail;
701 result = usb_ep_enable(ep);
702 if (result < 0)
703 goto fail;
704 ep->driver_data = ss;
705
706 result = source_sink_start_ep(ss, false, false, speed);
707 if (result < 0) {
708 fail2:
709 ep = ss->out_ep;
710 usb_ep_disable(ep);
711 ep->driver_data = NULL;
712 goto fail;
713 }
714
715 if (alt == 0)
716 goto out;
717
718 /* one iso endpoint writes (sources) zeroes IN (to the host) */
719 ep = ss->iso_in_ep;
720 if (ep) {
721 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
722 if (result)
723 goto fail2;
724 result = usb_ep_enable(ep);
725 if (result < 0)
726 goto fail2;
727 ep->driver_data = ss;
728
729 result = source_sink_start_ep(ss, true, true, speed);
730 if (result < 0) {
731 fail3:
732 ep = ss->iso_in_ep;
733 if (ep) {
734 usb_ep_disable(ep);
735 ep->driver_data = NULL;
736 }
737 goto fail2;
738 }
739 }
740
741 /* one iso endpoint reads (sinks) anything OUT (from the host) */
742 ep = ss->iso_out_ep;
743 if (ep) {
744 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
745 if (result)
746 goto fail3;
747 result = usb_ep_enable(ep);
748 if (result < 0)
749 goto fail3;
750 ep->driver_data = ss;
751
752 result = source_sink_start_ep(ss, false, true, speed);
753 if (result < 0) {
754 usb_ep_disable(ep);
755 ep->driver_data = NULL;
756 goto fail3;
757 }
758 }
759 out:
760 ss->cur_alt = alt;
761
762 DBG(cdev, "%s enabled, alt intf %d\n", ss->function.name, alt);
763 return result;
764 }
765
766 static int sourcesink_set_alt(struct usb_function *f,
767 unsigned intf, unsigned alt)
768 {
769 struct f_sourcesink *ss = func_to_ss(f);
770 struct usb_composite_dev *cdev = f->config->cdev;
771
772 if (ss->in_ep->driver_data)
773 disable_source_sink(ss);
774 return enable_source_sink(cdev, ss, alt);
775 }
776
777 static int sourcesink_get_alt(struct usb_function *f, unsigned intf)
778 {
779 struct f_sourcesink *ss = func_to_ss(f);
780
781 return ss->cur_alt;
782 }
783
784 static void sourcesink_disable(struct usb_function *f)
785 {
786 struct f_sourcesink *ss = func_to_ss(f);
787
788 disable_source_sink(ss);
789 }
790
791 /*-------------------------------------------------------------------------*/
792
793 static int sourcesink_setup(struct usb_function *f,
794 const struct usb_ctrlrequest *ctrl)
795 {
796 struct usb_configuration *c = f->config;
797 struct usb_request *req = c->cdev->req;
798 int value = -EOPNOTSUPP;
799 u16 w_index = le16_to_cpu(ctrl->wIndex);
800 u16 w_value = le16_to_cpu(ctrl->wValue);
801 u16 w_length = le16_to_cpu(ctrl->wLength);
802
803 req->length = USB_COMP_EP0_BUFSIZ;
804
805 /* composite driver infrastructure handles everything except
806 * the two control test requests.
807 */
808 switch (ctrl->bRequest) {
809
810 /*
811 * These are the same vendor-specific requests supported by
812 * Intel's USB 2.0 compliance test devices. We exceed that
813 * device spec by allowing multiple-packet requests.
814 *
815 * NOTE: the Control-OUT data stays in req->buf ... better
816 * would be copying it into a scratch buffer, so that other
817 * requests may safely intervene.
818 */
819 case 0x5b: /* control WRITE test -- fill the buffer */
820 if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
821 goto unknown;
822 if (w_value || w_index)
823 break;
824 /* just read that many bytes into the buffer */
825 if (w_length > req->length)
826 break;
827 value = w_length;
828 break;
829 case 0x5c: /* control READ test -- return the buffer */
830 if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
831 goto unknown;
832 if (w_value || w_index)
833 break;
834 /* expect those bytes are still in the buffer; send back */
835 if (w_length > req->length)
836 break;
837 value = w_length;
838 break;
839
840 default:
841 unknown:
842 VDBG(c->cdev,
843 "unknown control req%02x.%02x v%04x i%04x l%d\n",
844 ctrl->bRequestType, ctrl->bRequest,
845 w_value, w_index, w_length);
846 }
847
848 /* respond with data transfer or status phase? */
849 if (value >= 0) {
850 VDBG(c->cdev, "source/sink req%02x.%02x v%04x i%04x l%d\n",
851 ctrl->bRequestType, ctrl->bRequest,
852 w_value, w_index, w_length);
853 req->zero = 0;
854 req->length = value;
855 value = usb_ep_queue(c->cdev->gadget->ep0, req, GFP_ATOMIC);
856 if (value < 0)
857 ERROR(c->cdev, "source/sink response, err %d\n",
858 value);
859 }
860
861 /* device either stalls (value < 0) or reports success */
862 return value;
863 }
864
865 static struct usb_function *source_sink_alloc_func(
866 struct usb_function_instance *fi)
867 {
868 struct f_sourcesink *ss;
869 struct f_ss_opts *ss_opts;
870
871 ss = kzalloc(sizeof(*ss), GFP_KERNEL);
872 if (!ss)
873 return NULL;
874
875 ss_opts = container_of(fi, struct f_ss_opts, func_inst);
876
877 mutex_lock(&ss_opts->lock);
878 ss_opts->refcnt++;
879 mutex_unlock(&ss_opts->lock);
880
881 pattern = ss_opts->pattern;
882 isoc_interval = ss_opts->isoc_interval;
883 isoc_maxpacket = ss_opts->isoc_maxpacket;
884 isoc_mult = ss_opts->isoc_mult;
885 isoc_maxburst = ss_opts->isoc_maxburst;
886 buflen = ss_opts->bulk_buflen;
887
888 ss->function.name = "source/sink";
889 ss->function.bind = sourcesink_bind;
890 ss->function.set_alt = sourcesink_set_alt;
891 ss->function.get_alt = sourcesink_get_alt;
892 ss->function.disable = sourcesink_disable;
893 ss->function.setup = sourcesink_setup;
894 ss->function.strings = sourcesink_strings;
895
896 ss->function.free_func = sourcesink_free_func;
897
898 return &ss->function;
899 }
900
901 static inline struct f_ss_opts *to_f_ss_opts(struct config_item *item)
902 {
903 return container_of(to_config_group(item), struct f_ss_opts,
904 func_inst.group);
905 }
906
907 CONFIGFS_ATTR_STRUCT(f_ss_opts);
908 CONFIGFS_ATTR_OPS(f_ss_opts);
909
910 static void ss_attr_release(struct config_item *item)
911 {
912 struct f_ss_opts *ss_opts = to_f_ss_opts(item);
913
914 usb_put_function_instance(&ss_opts->func_inst);
915 }
916
917 static struct configfs_item_operations ss_item_ops = {
918 .release = ss_attr_release,
919 .show_attribute = f_ss_opts_attr_show,
920 .store_attribute = f_ss_opts_attr_store,
921 };
922
923 static ssize_t f_ss_opts_pattern_show(struct f_ss_opts *opts, char *page)
924 {
925 int result;
926
927 mutex_lock(&opts->lock);
928 result = sprintf(page, "%u", opts->pattern);
929 mutex_unlock(&opts->lock);
930
931 return result;
932 }
933
934 static ssize_t f_ss_opts_pattern_store(struct f_ss_opts *opts,
935 const char *page, size_t len)
936 {
937 int ret;
938 u8 num;
939
940 mutex_lock(&opts->lock);
941 if (opts->refcnt) {
942 ret = -EBUSY;
943 goto end;
944 }
945
946 ret = kstrtou8(page, 0, &num);
947 if (ret)
948 goto end;
949
950 if (num != 0 && num != 1 && num != 2) {
951 ret = -EINVAL;
952 goto end;
953 }
954
955 opts->pattern = num;
956 ret = len;
957 end:
958 mutex_unlock(&opts->lock);
959 return ret;
960 }
961
962 static struct f_ss_opts_attribute f_ss_opts_pattern =
963 __CONFIGFS_ATTR(pattern, S_IRUGO | S_IWUSR,
964 f_ss_opts_pattern_show,
965 f_ss_opts_pattern_store);
966
967 static ssize_t f_ss_opts_isoc_interval_show(struct f_ss_opts *opts, char *page)
968 {
969 int result;
970
971 mutex_lock(&opts->lock);
972 result = sprintf(page, "%u", opts->isoc_interval);
973 mutex_unlock(&opts->lock);
974
975 return result;
976 }
977
978 static ssize_t f_ss_opts_isoc_interval_store(struct f_ss_opts *opts,
979 const char *page, size_t len)
980 {
981 int ret;
982 u8 num;
983
984 mutex_lock(&opts->lock);
985 if (opts->refcnt) {
986 ret = -EBUSY;
987 goto end;
988 }
989
990 ret = kstrtou8(page, 0, &num);
991 if (ret)
992 goto end;
993
994 if (num > 16) {
995 ret = -EINVAL;
996 goto end;
997 }
998
999 opts->isoc_interval = num;
1000 ret = len;
1001 end:
1002 mutex_unlock(&opts->lock);
1003 return ret;
1004 }
1005
1006 static struct f_ss_opts_attribute f_ss_opts_isoc_interval =
1007 __CONFIGFS_ATTR(isoc_interval, S_IRUGO | S_IWUSR,
1008 f_ss_opts_isoc_interval_show,
1009 f_ss_opts_isoc_interval_store);
1010
1011 static ssize_t f_ss_opts_isoc_maxpacket_show(struct f_ss_opts *opts, char *page)
1012 {
1013 int result;
1014
1015 mutex_lock(&opts->lock);
1016 result = sprintf(page, "%u", opts->isoc_maxpacket);
1017 mutex_unlock(&opts->lock);
1018
1019 return result;
1020 }
1021
1022 static ssize_t f_ss_opts_isoc_maxpacket_store(struct f_ss_opts *opts,
1023 const char *page, size_t len)
1024 {
1025 int ret;
1026 u16 num;
1027
1028 mutex_lock(&opts->lock);
1029 if (opts->refcnt) {
1030 ret = -EBUSY;
1031 goto end;
1032 }
1033
1034 ret = kstrtou16(page, 0, &num);
1035 if (ret)
1036 goto end;
1037
1038 if (num > 1024) {
1039 ret = -EINVAL;
1040 goto end;
1041 }
1042
1043 opts->isoc_maxpacket = num;
1044 ret = len;
1045 end:
1046 mutex_unlock(&opts->lock);
1047 return ret;
1048 }
1049
1050 static struct f_ss_opts_attribute f_ss_opts_isoc_maxpacket =
1051 __CONFIGFS_ATTR(isoc_maxpacket, S_IRUGO | S_IWUSR,
1052 f_ss_opts_isoc_maxpacket_show,
1053 f_ss_opts_isoc_maxpacket_store);
1054
1055 static ssize_t f_ss_opts_isoc_mult_show(struct f_ss_opts *opts, char *page)
1056 {
1057 int result;
1058
1059 mutex_lock(&opts->lock);
1060 result = sprintf(page, "%u", opts->isoc_mult);
1061 mutex_unlock(&opts->lock);
1062
1063 return result;
1064 }
1065
1066 static ssize_t f_ss_opts_isoc_mult_store(struct f_ss_opts *opts,
1067 const char *page, size_t len)
1068 {
1069 int ret;
1070 u8 num;
1071
1072 mutex_lock(&opts->lock);
1073 if (opts->refcnt) {
1074 ret = -EBUSY;
1075 goto end;
1076 }
1077
1078 ret = kstrtou8(page, 0, &num);
1079 if (ret)
1080 goto end;
1081
1082 if (num > 2) {
1083 ret = -EINVAL;
1084 goto end;
1085 }
1086
1087 opts->isoc_mult = num;
1088 ret = len;
1089 end:
1090 mutex_unlock(&opts->lock);
1091 return ret;
1092 }
1093
1094 static struct f_ss_opts_attribute f_ss_opts_isoc_mult =
1095 __CONFIGFS_ATTR(isoc_mult, S_IRUGO | S_IWUSR,
1096 f_ss_opts_isoc_mult_show,
1097 f_ss_opts_isoc_mult_store);
1098
1099 static ssize_t f_ss_opts_isoc_maxburst_show(struct f_ss_opts *opts, char *page)
1100 {
1101 int result;
1102
1103 mutex_lock(&opts->lock);
1104 result = sprintf(page, "%u", opts->isoc_maxburst);
1105 mutex_unlock(&opts->lock);
1106
1107 return result;
1108 }
1109
1110 static ssize_t f_ss_opts_isoc_maxburst_store(struct f_ss_opts *opts,
1111 const char *page, size_t len)
1112 {
1113 int ret;
1114 u8 num;
1115
1116 mutex_lock(&opts->lock);
1117 if (opts->refcnt) {
1118 ret = -EBUSY;
1119 goto end;
1120 }
1121
1122 ret = kstrtou8(page, 0, &num);
1123 if (ret)
1124 goto end;
1125
1126 if (num > 15) {
1127 ret = -EINVAL;
1128 goto end;
1129 }
1130
1131 opts->isoc_maxburst = num;
1132 ret = len;
1133 end:
1134 mutex_unlock(&opts->lock);
1135 return ret;
1136 }
1137
1138 static struct f_ss_opts_attribute f_ss_opts_isoc_maxburst =
1139 __CONFIGFS_ATTR(isoc_maxburst, S_IRUGO | S_IWUSR,
1140 f_ss_opts_isoc_maxburst_show,
1141 f_ss_opts_isoc_maxburst_store);
1142
1143 static ssize_t f_ss_opts_bulk_buflen_show(struct f_ss_opts *opts, char *page)
1144 {
1145 int result;
1146
1147 mutex_lock(&opts->lock);
1148 result = sprintf(page, "%u", opts->bulk_buflen);
1149 mutex_unlock(&opts->lock);
1150
1151 return result;
1152 }
1153
1154 static ssize_t f_ss_opts_bulk_buflen_store(struct f_ss_opts *opts,
1155 const char *page, size_t len)
1156 {
1157 int ret;
1158 u32 num;
1159
1160 mutex_lock(&opts->lock);
1161 if (opts->refcnt) {
1162 ret = -EBUSY;
1163 goto end;
1164 }
1165
1166 ret = kstrtou32(page, 0, &num);
1167 if (ret)
1168 goto end;
1169
1170 opts->bulk_buflen = num;
1171 ret = len;
1172 end:
1173 mutex_unlock(&opts->lock);
1174 return ret;
1175 }
1176
1177 static struct f_ss_opts_attribute f_ss_opts_bulk_buflen =
1178 __CONFIGFS_ATTR(buflen, S_IRUGO | S_IWUSR,
1179 f_ss_opts_bulk_buflen_show,
1180 f_ss_opts_bulk_buflen_store);
1181
1182 static struct configfs_attribute *ss_attrs[] = {
1183 &f_ss_opts_pattern.attr,
1184 &f_ss_opts_isoc_interval.attr,
1185 &f_ss_opts_isoc_maxpacket.attr,
1186 &f_ss_opts_isoc_mult.attr,
1187 &f_ss_opts_isoc_maxburst.attr,
1188 &f_ss_opts_bulk_buflen.attr,
1189 NULL,
1190 };
1191
1192 static struct config_item_type ss_func_type = {
1193 .ct_item_ops = &ss_item_ops,
1194 .ct_attrs = ss_attrs,
1195 .ct_owner = THIS_MODULE,
1196 };
1197
1198 static void source_sink_free_instance(struct usb_function_instance *fi)
1199 {
1200 struct f_ss_opts *ss_opts;
1201
1202 ss_opts = container_of(fi, struct f_ss_opts, func_inst);
1203 kfree(ss_opts);
1204 }
1205
1206 static struct usb_function_instance *source_sink_alloc_inst(void)
1207 {
1208 struct f_ss_opts *ss_opts;
1209
1210 ss_opts = kzalloc(sizeof(*ss_opts), GFP_KERNEL);
1211 if (!ss_opts)
1212 return ERR_PTR(-ENOMEM);
1213 mutex_init(&ss_opts->lock);
1214 ss_opts->func_inst.free_func_inst = source_sink_free_instance;
1215 ss_opts->isoc_interval = GZERO_ISOC_INTERVAL;
1216 ss_opts->isoc_maxpacket = GZERO_ISOC_MAXPACKET;
1217 ss_opts->bulk_buflen = GZERO_BULK_BUFLEN;
1218
1219 config_group_init_type_name(&ss_opts->func_inst.group, "",
1220 &ss_func_type);
1221
1222 return &ss_opts->func_inst;
1223 }
1224 DECLARE_USB_FUNCTION(SourceSink, source_sink_alloc_inst,
1225 source_sink_alloc_func);
1226
1227 static int __init sslb_modinit(void)
1228 {
1229 int ret;
1230
1231 ret = usb_function_register(&SourceSinkusb_func);
1232 if (ret)
1233 return ret;
1234 ret = lb_modinit();
1235 if (ret)
1236 usb_function_unregister(&SourceSinkusb_func);
1237 return ret;
1238 }
1239 static void __exit sslb_modexit(void)
1240 {
1241 usb_function_unregister(&SourceSinkusb_func);
1242 lb_modexit();
1243 }
1244 module_init(sslb_modinit);
1245 module_exit(sslb_modexit);
1246
1247 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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