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