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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / usb / gadget / function / f_sourcesink.c
blobed68a4860b7d8702e1a8fd9cca40b04b5065a4ce
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * f_sourcesink.c - USB peripheral source/sink configuration driver
4 *
5 * Copyright (C) 2003-2008 David Brownell
6 * Copyright (C) 2008 by Nokia Corporation
7 */
8
9 /* #define VERBOSE_DEBUG */
10
11 #include <linux/slab.h>
12 #include <linux/kernel.h>
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/usb/composite.h>
16 #include <linux/err.h>
17
18 #include "g_zero.h"
19 #include "u_f.h"
20
21 /*
22 * SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripheral
23 * controller drivers.
24 *
25 * This just sinks bulk packets OUT to the peripheral and sources them IN
26 * to the host, optionally with specific data patterns for integrity tests.
27 * As such it supports basic functionality and load tests.
28 *
29 * In terms of control messaging, this supports all the standard requests
30 * plus two that support control-OUT tests. If the optional "autoresume"
31 * mode is enabled, it provides good functional coverage for the "USBCV"
32 * test harness from USB-IF.
33 */
34 struct f_sourcesink {
35 struct usb_function function;
36
37 struct usb_ep *in_ep;
38 struct usb_ep *out_ep;
39 struct usb_ep *iso_in_ep;
40 struct usb_ep *iso_out_ep;
41 int cur_alt;
42
43 unsigned pattern;
44 unsigned isoc_interval;
45 unsigned isoc_maxpacket;
46 unsigned isoc_mult;
47 unsigned isoc_maxburst;
48 unsigned buflen;
49 unsigned bulk_qlen;
50 unsigned iso_qlen;
51 };
52
53 static inline struct f_sourcesink *func_to_ss(struct usb_function *f)
54 {
55 return container_of(f, struct f_sourcesink, function);
56 }
57
58 /*-------------------------------------------------------------------------*/
59
60 static struct usb_interface_descriptor source_sink_intf_alt0 = {
61 .bLength = USB_DT_INTERFACE_SIZE,
62 .bDescriptorType = USB_DT_INTERFACE,
63
64 .bAlternateSetting = 0,
65 .bNumEndpoints = 2,
66 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
67 /* .iInterface = DYNAMIC */
68 };
69
70 static struct usb_interface_descriptor source_sink_intf_alt1 = {
71 .bLength = USB_DT_INTERFACE_SIZE,
72 .bDescriptorType = USB_DT_INTERFACE,
73
74 .bAlternateSetting = 1,
75 .bNumEndpoints = 4,
76 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
77 /* .iInterface = DYNAMIC */
78 };
79
80 /* full speed support: */
81
82 static struct usb_endpoint_descriptor fs_source_desc = {
83 .bLength = USB_DT_ENDPOINT_SIZE,
84 .bDescriptorType = USB_DT_ENDPOINT,
85
86 .bEndpointAddress = USB_DIR_IN,
87 .bmAttributes = USB_ENDPOINT_XFER_BULK,
88 };
89
90 static struct usb_endpoint_descriptor fs_sink_desc = {
91 .bLength = USB_DT_ENDPOINT_SIZE,
92 .bDescriptorType = USB_DT_ENDPOINT,
93
94 .bEndpointAddress = USB_DIR_OUT,
95 .bmAttributes = USB_ENDPOINT_XFER_BULK,
96 };
97
98 static struct usb_endpoint_descriptor fs_iso_source_desc = {
99 .bLength = USB_DT_ENDPOINT_SIZE,
100 .bDescriptorType = USB_DT_ENDPOINT,
101
102 .bEndpointAddress = USB_DIR_IN,
103 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
104 .wMaxPacketSize = cpu_to_le16(1023),
105 .bInterval = 4,
106 };
107
108 static struct usb_endpoint_descriptor fs_iso_sink_desc = {
109 .bLength = USB_DT_ENDPOINT_SIZE,
110 .bDescriptorType = USB_DT_ENDPOINT,
111
112 .bEndpointAddress = USB_DIR_OUT,
113 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
114 .wMaxPacketSize = cpu_to_le16(1023),
115 .bInterval = 4,
116 };
117
118 static struct usb_descriptor_header *fs_source_sink_descs[] = {
119 (struct usb_descriptor_header *) &source_sink_intf_alt0,
120 (struct usb_descriptor_header *) &fs_sink_desc,
121 (struct usb_descriptor_header *) &fs_source_desc,
122 (struct usb_descriptor_header *) &source_sink_intf_alt1,
123 #define FS_ALT_IFC_1_OFFSET 3
124 (struct usb_descriptor_header *) &fs_sink_desc,
125 (struct usb_descriptor_header *) &fs_source_desc,
126 (struct usb_descriptor_header *) &fs_iso_sink_desc,
127 (struct usb_descriptor_header *) &fs_iso_source_desc,
128 NULL,
129 };
130
131 /* high speed support: */
132
133 static struct usb_endpoint_descriptor hs_source_desc = {
134 .bLength = USB_DT_ENDPOINT_SIZE,
135 .bDescriptorType = USB_DT_ENDPOINT,
136
137 .bmAttributes = USB_ENDPOINT_XFER_BULK,
138 .wMaxPacketSize = cpu_to_le16(512),
139 };
140
141 static struct usb_endpoint_descriptor hs_sink_desc = {
142 .bLength = USB_DT_ENDPOINT_SIZE,
143 .bDescriptorType = USB_DT_ENDPOINT,
144
145 .bmAttributes = USB_ENDPOINT_XFER_BULK,
146 .wMaxPacketSize = cpu_to_le16(512),
147 };
148
149 static struct usb_endpoint_descriptor hs_iso_source_desc = {
150 .bLength = USB_DT_ENDPOINT_SIZE,
151 .bDescriptorType = USB_DT_ENDPOINT,
152
153 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
154 .wMaxPacketSize = cpu_to_le16(1024),
155 .bInterval = 4,
156 };
157
158 static struct usb_endpoint_descriptor hs_iso_sink_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_descriptor_header *hs_source_sink_descs[] = {
168 (struct usb_descriptor_header *) &source_sink_intf_alt0,
169 (struct usb_descriptor_header *) &hs_source_desc,
170 (struct usb_descriptor_header *) &hs_sink_desc,
171 (struct usb_descriptor_header *) &source_sink_intf_alt1,
172 #define HS_ALT_IFC_1_OFFSET 3
173 (struct usb_descriptor_header *) &hs_source_desc,
174 (struct usb_descriptor_header *) &hs_sink_desc,
175 (struct usb_descriptor_header *) &hs_iso_source_desc,
176 (struct usb_descriptor_header *) &hs_iso_sink_desc,
177 NULL,
178 };
179
180 /* super speed support: */
181
182 static struct usb_endpoint_descriptor ss_source_desc = {
183 .bLength = USB_DT_ENDPOINT_SIZE,
184 .bDescriptorType = USB_DT_ENDPOINT,
185
186 .bmAttributes = USB_ENDPOINT_XFER_BULK,
187 .wMaxPacketSize = cpu_to_le16(1024),
188 };
189
190 static struct usb_ss_ep_comp_descriptor ss_source_comp_desc = {
191 .bLength = USB_DT_SS_EP_COMP_SIZE,
192 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
193
194 .bMaxBurst = 0,
195 .bmAttributes = 0,
196 .wBytesPerInterval = 0,
197 };
198
199 static struct usb_endpoint_descriptor ss_sink_desc = {
200 .bLength = USB_DT_ENDPOINT_SIZE,
201 .bDescriptorType = USB_DT_ENDPOINT,
202
203 .bmAttributes = USB_ENDPOINT_XFER_BULK,
204 .wMaxPacketSize = cpu_to_le16(1024),
205 };
206
207 static struct usb_ss_ep_comp_descriptor ss_sink_comp_desc = {
208 .bLength = USB_DT_SS_EP_COMP_SIZE,
209 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
210
211 .bMaxBurst = 0,
212 .bmAttributes = 0,
213 .wBytesPerInterval = 0,
214 };
215
216 static struct usb_endpoint_descriptor ss_iso_source_desc = {
217 .bLength = USB_DT_ENDPOINT_SIZE,
218 .bDescriptorType = USB_DT_ENDPOINT,
219
220 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
221 .wMaxPacketSize = cpu_to_le16(1024),
222 .bInterval = 4,
223 };
224
225 static struct usb_ss_ep_comp_descriptor ss_iso_source_comp_desc = {
226 .bLength = USB_DT_SS_EP_COMP_SIZE,
227 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
228
229 .bMaxBurst = 0,
230 .bmAttributes = 0,
231 .wBytesPerInterval = cpu_to_le16(1024),
232 };
233
234 static struct usb_endpoint_descriptor ss_iso_sink_desc = {
235 .bLength = USB_DT_ENDPOINT_SIZE,
236 .bDescriptorType = USB_DT_ENDPOINT,
237
238 .bmAttributes = USB_ENDPOINT_XFER_ISOC,
239 .wMaxPacketSize = cpu_to_le16(1024),
240 .bInterval = 4,
241 };
242
243 static struct usb_ss_ep_comp_descriptor ss_iso_sink_comp_desc = {
244 .bLength = USB_DT_SS_EP_COMP_SIZE,
245 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
246
247 .bMaxBurst = 0,
248 .bmAttributes = 0,
249 .wBytesPerInterval = cpu_to_le16(1024),
250 };
251
252 static struct usb_descriptor_header *ss_source_sink_descs[] = {
253 (struct usb_descriptor_header *) &source_sink_intf_alt0,
254 (struct usb_descriptor_header *) &ss_source_desc,
255 (struct usb_descriptor_header *) &ss_source_comp_desc,
256 (struct usb_descriptor_header *) &ss_sink_desc,
257 (struct usb_descriptor_header *) &ss_sink_comp_desc,
258 (struct usb_descriptor_header *) &source_sink_intf_alt1,
259 #define SS_ALT_IFC_1_OFFSET 5
260 (struct usb_descriptor_header *) &ss_source_desc,
261 (struct usb_descriptor_header *) &ss_source_comp_desc,
262 (struct usb_descriptor_header *) &ss_sink_desc,
263 (struct usb_descriptor_header *) &ss_sink_comp_desc,
264 (struct usb_descriptor_header *) &ss_iso_source_desc,
265 (struct usb_descriptor_header *) &ss_iso_source_comp_desc,
266 (struct usb_descriptor_header *) &ss_iso_sink_desc,
267 (struct usb_descriptor_header *) &ss_iso_sink_comp_desc,
268 NULL,
269 };
270
271 /* function-specific strings: */
272
273 static struct usb_string strings_sourcesink[] = {
274 [0].s = "source and sink data",
275 { } /* end of list */
276 };
277
278 static struct usb_gadget_strings stringtab_sourcesink = {
279 .language = 0x0409, /* en-us */
280 .strings = strings_sourcesink,
281 };
282
283 static struct usb_gadget_strings *sourcesink_strings[] = {
284 &stringtab_sourcesink,
285 NULL,
286 };
287
288 /*-------------------------------------------------------------------------*/
289
290 static inline struct usb_request *ss_alloc_ep_req(struct usb_ep *ep, int len)
291 {
292 return alloc_ep_req(ep, len);
293 }
294
295 static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
296 {
297 int value;
298
299 value = usb_ep_disable(ep);
300 if (value < 0)
301 DBG(cdev, "disable %s --> %d\n", ep->name, value);
302 }
303
304 void disable_endpoints(struct usb_composite_dev *cdev,
305 struct usb_ep *in, struct usb_ep *out,
306 struct usb_ep *iso_in, struct usb_ep *iso_out)
307 {
308 disable_ep(cdev, in);
309 disable_ep(cdev, out);
310 if (iso_in)
311 disable_ep(cdev, iso_in);
312 if (iso_out)
313 disable_ep(cdev, iso_out);
314 }
315
316 static int
317 sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
318 {
319 struct usb_composite_dev *cdev = c->cdev;
320 struct f_sourcesink *ss = func_to_ss(f);
321 int id;
322 int ret;
323
324 /* allocate interface ID(s) */
325 id = usb_interface_id(c, f);
326 if (id < 0)
327 return id;
328 source_sink_intf_alt0.bInterfaceNumber = id;
329 source_sink_intf_alt1.bInterfaceNumber = id;
330
331 /* allocate bulk endpoints */
332 ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
333 if (!ss->in_ep) {
334 autoconf_fail:
335 ERROR(cdev, "%s: can't autoconfigure on %s\n",
336 f->name, cdev->gadget->name);
337 return -ENODEV;
338 }
339
340 ss->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
341 if (!ss->out_ep)
342 goto autoconf_fail;
343
344 /* sanity check the isoc module parameters */
345 if (ss->isoc_interval < 1)
346 ss->isoc_interval = 1;
347 if (ss->isoc_interval > 16)
348 ss->isoc_interval = 16;
349 if (ss->isoc_mult > 2)
350 ss->isoc_mult = 2;
351 if (ss->isoc_maxburst > 15)
352 ss->isoc_maxburst = 15;
353
354 /* fill in the FS isoc descriptors from the module parameters */
355 fs_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket > 1023 ?
356 1023 : ss->isoc_maxpacket;
357 fs_iso_source_desc.bInterval = ss->isoc_interval;
358 fs_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket > 1023 ?
359 1023 : ss->isoc_maxpacket;
360 fs_iso_sink_desc.bInterval = ss->isoc_interval;
361
362 /* allocate iso endpoints */
363 ss->iso_in_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_source_desc);
364 if (!ss->iso_in_ep)
365 goto no_iso;
366
367 ss->iso_out_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_sink_desc);
368 if (!ss->iso_out_ep) {
369 usb_ep_autoconfig_release(ss->iso_in_ep);
370 ss->iso_in_ep = NULL;
371 no_iso:
372 /*
373 * We still want to work even if the UDC doesn't have isoc
374 * endpoints, so null out the alt interface that contains
375 * them and continue.
376 */
377 fs_source_sink_descs[FS_ALT_IFC_1_OFFSET] = NULL;
378 hs_source_sink_descs[HS_ALT_IFC_1_OFFSET] = NULL;
379 ss_source_sink_descs[SS_ALT_IFC_1_OFFSET] = NULL;
380 }
381
382 if (ss->isoc_maxpacket > 1024)
383 ss->isoc_maxpacket = 1024;
384
385 /* support high speed hardware */
386 hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
387 hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
388
389 /*
390 * Fill in the HS isoc descriptors from the module parameters.
391 * We assume that the user knows what they are doing and won't
392 * give parameters that their UDC doesn't support.
393 */
394 hs_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket;
395 hs_iso_source_desc.wMaxPacketSize |= ss->isoc_mult << 11;
396 hs_iso_source_desc.bInterval = ss->isoc_interval;
397 hs_iso_source_desc.bEndpointAddress =
398 fs_iso_source_desc.bEndpointAddress;
399
400 hs_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket;
401 hs_iso_sink_desc.wMaxPacketSize |= ss->isoc_mult << 11;
402 hs_iso_sink_desc.bInterval = ss->isoc_interval;
403 hs_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
404
405 /* support super speed hardware */
406 ss_source_desc.bEndpointAddress =
407 fs_source_desc.bEndpointAddress;
408 ss_sink_desc.bEndpointAddress =
409 fs_sink_desc.bEndpointAddress;
410
411 /*
412 * Fill in the SS isoc descriptors from the module parameters.
413 * We assume that the user knows what they are doing and won't
414 * give parameters that their UDC doesn't support.
415 */
416 ss_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket;
417 ss_iso_source_desc.bInterval = ss->isoc_interval;
418 ss_iso_source_comp_desc.bmAttributes = ss->isoc_mult;
419 ss_iso_source_comp_desc.bMaxBurst = ss->isoc_maxburst;
420 ss_iso_source_comp_desc.wBytesPerInterval = ss->isoc_maxpacket *
421 (ss->isoc_mult + 1) * (ss->isoc_maxburst + 1);
422 ss_iso_source_desc.bEndpointAddress =
423 fs_iso_source_desc.bEndpointAddress;
424
425 ss_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket;
426 ss_iso_sink_desc.bInterval = ss->isoc_interval;
427 ss_iso_sink_comp_desc.bmAttributes = ss->isoc_mult;
428 ss_iso_sink_comp_desc.bMaxBurst = ss->isoc_maxburst;
429 ss_iso_sink_comp_desc.wBytesPerInterval = ss->isoc_maxpacket *
430 (ss->isoc_mult + 1) * (ss->isoc_maxburst + 1);
431 ss_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
432
433 ret = usb_assign_descriptors(f, fs_source_sink_descs,
434 hs_source_sink_descs, ss_source_sink_descs, NULL);
435 if (ret)
436 return ret;
437
438 DBG(cdev, "%s speed %s: IN/%s, OUT/%s, ISO-IN/%s, ISO-OUT/%s\n",
439 (gadget_is_superspeed(c->cdev->gadget) ? "super" :
440 (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")),
441 f->name, ss->in_ep->name, ss->out_ep->name,
442 ss->iso_in_ep ? ss->iso_in_ep->name : "<none>",
443 ss->iso_out_ep ? ss->iso_out_ep->name : "<none>");
444 return 0;
445 }
446
447 static void
448 sourcesink_free_func(struct usb_function *f)
449 {
450 struct f_ss_opts *opts;
451
452 opts = container_of(f->fi, struct f_ss_opts, func_inst);
453
454 mutex_lock(&opts->lock);
455 opts->refcnt--;
456 mutex_unlock(&opts->lock);
457
458 usb_free_all_descriptors(f);
459 kfree(func_to_ss(f));
460 }
461
462 /* optionally require specific source/sink data patterns */
463 static int check_read_data(struct f_sourcesink *ss, struct usb_request *req)
464 {
465 unsigned i;
466 u8 *buf = req->buf;
467 struct usb_composite_dev *cdev = ss->function.config->cdev;
468 int max_packet_size = le16_to_cpu(ss->out_ep->desc->wMaxPacketSize);
469
470 if (ss->pattern == 2)
471 return 0;
472
473 for (i = 0; i < req->actual; i++, buf++) {
474 switch (ss->pattern) {
475
476 /* all-zeroes has no synchronization issues */
477 case 0:
478 if (*buf == 0)
479 continue;
480 break;
481
482 /* "mod63" stays in sync with short-terminated transfers,
483 * OR otherwise when host and gadget agree on how large
484 * each usb transfer request should be. Resync is done
485 * with set_interface or set_config. (We *WANT* it to
486 * get quickly out of sync if controllers or their drivers
487 * stutter for any reason, including buffer duplication...)
488 */
489 case 1:
490 if (*buf == (u8)((i % max_packet_size) % 63))
491 continue;
492 break;
493 }
494 ERROR(cdev, "bad OUT byte, buf[%d] = %d\n", i, *buf);
495 usb_ep_set_halt(ss->out_ep);
496 return -EINVAL;
497 }
498 return 0;
499 }
500
501 static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
502 {
503 unsigned i;
504 u8 *buf = req->buf;
505 int max_packet_size = le16_to_cpu(ep->desc->wMaxPacketSize);
506 struct f_sourcesink *ss = ep->driver_data;
507
508 switch (ss->pattern) {
509 case 0:
510 memset(req->buf, 0, req->length);
511 break;
512 case 1:
513 for (i = 0; i < req->length; i++)
514 *buf++ = (u8) ((i % max_packet_size) % 63);
515 break;
516 case 2:
517 break;
518 }
519 }
520
521 static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
522 {
523 struct usb_composite_dev *cdev;
524 struct f_sourcesink *ss = ep->driver_data;
525 int status = req->status;
526
527 /* driver_data will be null if ep has been disabled */
528 if (!ss)
529 return;
530
531 cdev = ss->function.config->cdev;
532
533 switch (status) {
534
535 case 0: /* normal completion? */
536 if (ep == ss->out_ep) {
537 check_read_data(ss, req);
538 if (ss->pattern != 2)
539 memset(req->buf, 0x55, req->length);
540 }
541 break;
542
543 /* this endpoint is normally active while we're configured */
544 case -ECONNABORTED: /* hardware forced ep reset */
545 case -ECONNRESET: /* request dequeued */
546 case -ESHUTDOWN: /* disconnect from host */
547 VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
548 req->actual, req->length);
549 if (ep == ss->out_ep)
550 check_read_data(ss, req);
551 free_ep_req(ep, req);
552 return;
553
554 case -EOVERFLOW: /* buffer overrun on read means that
555 * we didn't provide a big enough
556 * buffer.
557 */
558 default:
559 #if 1
560 DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
561 status, req->actual, req->length);
562 #endif
563 case -EREMOTEIO: /* short read */
564 break;
565 }
566
567 status = usb_ep_queue(ep, req, GFP_ATOMIC);
568 if (status) {
569 ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n",
570 ep->name, req->length, status);
571 usb_ep_set_halt(ep);
572 /* FIXME recover later ... somehow */
573 }
574 }
575
576 static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in,
577 bool is_iso, int speed)
578 {
579 struct usb_ep *ep;
580 struct usb_request *req;
581 int i, size, qlen, status = 0;
582
583 if (is_iso) {
584 switch (speed) {
585 case USB_SPEED_SUPER:
586 size = ss->isoc_maxpacket *
587 (ss->isoc_mult + 1) *
588 (ss->isoc_maxburst + 1);
589 break;
590 case USB_SPEED_HIGH:
591 size = ss->isoc_maxpacket * (ss->isoc_mult + 1);
592 break;
593 default:
594 size = ss->isoc_maxpacket > 1023 ?
595 1023 : ss->isoc_maxpacket;
596 break;
597 }
598 ep = is_in ? ss->iso_in_ep : ss->iso_out_ep;
599 qlen = ss->iso_qlen;
600 } else {
601 ep = is_in ? ss->in_ep : ss->out_ep;
602 qlen = ss->bulk_qlen;
603 size = ss->buflen;
604 }
605
606 for (i = 0; i < qlen; i++) {
607 req = ss_alloc_ep_req(ep, size);
608 if (!req)
609 return -ENOMEM;
610
611 req->complete = source_sink_complete;
612 if (is_in)
613 reinit_write_data(ep, req);
614 else if (ss->pattern != 2)
615 memset(req->buf, 0x55, req->length);
616
617 status = usb_ep_queue(ep, req, GFP_ATOMIC);
618 if (status) {
619 struct usb_composite_dev *cdev;
620
621 cdev = ss->function.config->cdev;
622 ERROR(cdev, "start %s%s %s --> %d\n",
623 is_iso ? "ISO-" : "", is_in ? "IN" : "OUT",
624 ep->name, status);
625 free_ep_req(ep, req);
626 return status;
627 }
628 }
629
630 return status;
631 }
632
633 static void disable_source_sink(struct f_sourcesink *ss)
634 {
635 struct usb_composite_dev *cdev;
636
637 cdev = ss->function.config->cdev;
638 disable_endpoints(cdev, ss->in_ep, ss->out_ep, ss->iso_in_ep,
639 ss->iso_out_ep);
640 VDBG(cdev, "%s disabled\n", ss->function.name);
641 }
642
643 static int
644 enable_source_sink(struct usb_composite_dev *cdev, struct f_sourcesink *ss,
645 int alt)
646 {
647 int result = 0;
648 int speed = cdev->gadget->speed;
649 struct usb_ep *ep;
650
651 /* one bulk endpoint writes (sources) zeroes IN (to the host) */
652 ep = ss->in_ep;
653 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
654 if (result)
655 return result;
656 result = usb_ep_enable(ep);
657 if (result < 0)
658 return result;
659 ep->driver_data = ss;
660
661 result = source_sink_start_ep(ss, true, false, speed);
662 if (result < 0) {
663 fail:
664 ep = ss->in_ep;
665 usb_ep_disable(ep);
666 return result;
667 }
668
669 /* one bulk endpoint reads (sinks) anything OUT (from the host) */
670 ep = ss->out_ep;
671 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
672 if (result)
673 goto fail;
674 result = usb_ep_enable(ep);
675 if (result < 0)
676 goto fail;
677 ep->driver_data = ss;
678
679 result = source_sink_start_ep(ss, false, false, speed);
680 if (result < 0) {
681 fail2:
682 ep = ss->out_ep;
683 usb_ep_disable(ep);
684 goto fail;
685 }
686
687 if (alt == 0)
688 goto out;
689
690 /* one iso endpoint writes (sources) zeroes IN (to the host) */
691 ep = ss->iso_in_ep;
692 if (ep) {
693 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
694 if (result)
695 goto fail2;
696 result = usb_ep_enable(ep);
697 if (result < 0)
698 goto fail2;
699 ep->driver_data = ss;
700
701 result = source_sink_start_ep(ss, true, true, speed);
702 if (result < 0) {
703 fail3:
704 ep = ss->iso_in_ep;
705 if (ep)
706 usb_ep_disable(ep);
707 goto fail2;
708 }
709 }
710
711 /* one iso endpoint reads (sinks) anything OUT (from the host) */
712 ep = ss->iso_out_ep;
713 if (ep) {
714 result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
715 if (result)
716 goto fail3;
717 result = usb_ep_enable(ep);
718 if (result < 0)
719 goto fail3;
720 ep->driver_data = ss;
721
722 result = source_sink_start_ep(ss, false, true, speed);
723 if (result < 0) {
724 usb_ep_disable(ep);
725 goto fail3;
726 }
727 }
728 out:
729 ss->cur_alt = alt;
730
731 DBG(cdev, "%s enabled, alt intf %d\n", ss->function.name, alt);
732 return result;
733 }
734
735 static int sourcesink_set_alt(struct usb_function *f,
736 unsigned intf, unsigned alt)
737 {
738 struct f_sourcesink *ss = func_to_ss(f);
739 struct usb_composite_dev *cdev = f->config->cdev;
740
741 disable_source_sink(ss);
742 return enable_source_sink(cdev, ss, alt);
743 }
744
745 static int sourcesink_get_alt(struct usb_function *f, unsigned intf)
746 {
747 struct f_sourcesink *ss = func_to_ss(f);
748
749 return ss->cur_alt;
750 }
751
752 static void sourcesink_disable(struct usb_function *f)
753 {
754 struct f_sourcesink *ss = func_to_ss(f);
755
756 disable_source_sink(ss);
757 }
758
759 /*-------------------------------------------------------------------------*/
760
761 static int sourcesink_setup(struct usb_function *f,
762 const struct usb_ctrlrequest *ctrl)
763 {
764 struct usb_configuration *c = f->config;
765 struct usb_request *req = c->cdev->req;
766 int value = -EOPNOTSUPP;
767 u16 w_index = le16_to_cpu(ctrl->wIndex);
768 u16 w_value = le16_to_cpu(ctrl->wValue);
769 u16 w_length = le16_to_cpu(ctrl->wLength);
770
771 req->length = USB_COMP_EP0_BUFSIZ;
772
773 /* composite driver infrastructure handles everything except
774 * the two control test requests.
775 */
776 switch (ctrl->bRequest) {
777
778 /*
779 * These are the same vendor-specific requests supported by
780 * Intel's USB 2.0 compliance test devices. We exceed that
781 * device spec by allowing multiple-packet requests.
782 *
783 * NOTE: the Control-OUT data stays in req->buf ... better
784 * would be copying it into a scratch buffer, so that other
785 * requests may safely intervene.
786 */
787 case 0x5b: /* control WRITE test -- fill the buffer */
788 if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
789 goto unknown;
790 if (w_value || w_index)
791 break;
792 /* just read that many bytes into the buffer */
793 if (w_length > req->length)
794 break;
795 value = w_length;
796 break;
797 case 0x5c: /* control READ test -- return the buffer */
798 if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
799 goto unknown;
800 if (w_value || w_index)
801 break;
802 /* expect those bytes are still in the buffer; send back */
803 if (w_length > req->length)
804 break;
805 value = w_length;
806 break;
807
808 default:
809 unknown:
810 VDBG(c->cdev,
811 "unknown control req%02x.%02x v%04x i%04x l%d\n",
812 ctrl->bRequestType, ctrl->bRequest,
813 w_value, w_index, w_length);
814 }
815
816 /* respond with data transfer or status phase? */
817 if (value >= 0) {
818 VDBG(c->cdev, "source/sink req%02x.%02x v%04x i%04x l%d\n",
819 ctrl->bRequestType, ctrl->bRequest,
820 w_value, w_index, w_length);
821 req->zero = 0;
822 req->length = value;
823 value = usb_ep_queue(c->cdev->gadget->ep0, req, GFP_ATOMIC);
824 if (value < 0)
825 ERROR(c->cdev, "source/sink response, err %d\n",
826 value);
827 }
828
829 /* device either stalls (value < 0) or reports success */
830 return value;
831 }
832
833 static struct usb_function *source_sink_alloc_func(
834 struct usb_function_instance *fi)
835 {
836 struct f_sourcesink *ss;
837 struct f_ss_opts *ss_opts;
838
839 ss = kzalloc(sizeof(*ss), GFP_KERNEL);
840 if (!ss)
841 return ERR_PTR(-ENOMEM);
842
843 ss_opts = container_of(fi, struct f_ss_opts, func_inst);
844
845 mutex_lock(&ss_opts->lock);
846 ss_opts->refcnt++;
847 mutex_unlock(&ss_opts->lock);
848
849 ss->pattern = ss_opts->pattern;
850 ss->isoc_interval = ss_opts->isoc_interval;
851 ss->isoc_maxpacket = ss_opts->isoc_maxpacket;
852 ss->isoc_mult = ss_opts->isoc_mult;
853 ss->isoc_maxburst = ss_opts->isoc_maxburst;
854 ss->buflen = ss_opts->bulk_buflen;
855 ss->bulk_qlen = ss_opts->bulk_qlen;
856 ss->iso_qlen = ss_opts->iso_qlen;
857
858 ss->function.name = "source/sink";
859 ss->function.bind = sourcesink_bind;
860 ss->function.set_alt = sourcesink_set_alt;
861 ss->function.get_alt = sourcesink_get_alt;
862 ss->function.disable = sourcesink_disable;
863 ss->function.setup = sourcesink_setup;
864 ss->function.strings = sourcesink_strings;
865
866 ss->function.free_func = sourcesink_free_func;
867
868 return &ss->function;
869 }
870
871 static inline struct f_ss_opts *to_f_ss_opts(struct config_item *item)
872 {
873 return container_of(to_config_group(item), struct f_ss_opts,
874 func_inst.group);
875 }
876
877 static void ss_attr_release(struct config_item *item)
878 {
879 struct f_ss_opts *ss_opts = to_f_ss_opts(item);
880
881 usb_put_function_instance(&ss_opts->func_inst);
882 }
883
884 static struct configfs_item_operations ss_item_ops = {
885 .release = ss_attr_release,
886 };
887
888 static ssize_t f_ss_opts_pattern_show(struct config_item *item, char *page)
889 {
890 struct f_ss_opts *opts = to_f_ss_opts(item);
891 int result;
892
893 mutex_lock(&opts->lock);
894 result = sprintf(page, "%u\n", opts->pattern);
895 mutex_unlock(&opts->lock);
896
897 return result;
898 }
899
900 static ssize_t f_ss_opts_pattern_store(struct config_item *item,
901 const char *page, size_t len)
902 {
903 struct f_ss_opts *opts = to_f_ss_opts(item);
904 int ret;
905 u8 num;
906
907 mutex_lock(&opts->lock);
908 if (opts->refcnt) {
909 ret = -EBUSY;
910 goto end;
911 }
912
913 ret = kstrtou8(page, 0, &num);
914 if (ret)
915 goto end;
916
917 if (num != 0 && num != 1 && num != 2) {
918 ret = -EINVAL;
919 goto end;
920 }
921
922 opts->pattern = num;
923 ret = len;
924 end:
925 mutex_unlock(&opts->lock);
926 return ret;
927 }
928
929 CONFIGFS_ATTR(f_ss_opts_, pattern);
930
931 static ssize_t f_ss_opts_isoc_interval_show(struct config_item *item, char *page)
932 {
933 struct f_ss_opts *opts = to_f_ss_opts(item);
934 int result;
935
936 mutex_lock(&opts->lock);
937 result = sprintf(page, "%u\n", opts->isoc_interval);
938 mutex_unlock(&opts->lock);
939
940 return result;
941 }
942
943 static ssize_t f_ss_opts_isoc_interval_store(struct config_item *item,
944 const char *page, size_t len)
945 {
946 struct f_ss_opts *opts = to_f_ss_opts(item);
947 int ret;
948 u8 num;
949
950 mutex_lock(&opts->lock);
951 if (opts->refcnt) {
952 ret = -EBUSY;
953 goto end;
954 }
955
956 ret = kstrtou8(page, 0, &num);
957 if (ret)
958 goto end;
959
960 if (num > 16) {
961 ret = -EINVAL;
962 goto end;
963 }
964
965 opts->isoc_interval = num;
966 ret = len;
967 end:
968 mutex_unlock(&opts->lock);
969 return ret;
970 }
971
972 CONFIGFS_ATTR(f_ss_opts_, isoc_interval);
973
974 static ssize_t f_ss_opts_isoc_maxpacket_show(struct config_item *item, char *page)
975 {
976 struct f_ss_opts *opts = to_f_ss_opts(item);
977 int result;
978
979 mutex_lock(&opts->lock);
980 result = sprintf(page, "%u\n", opts->isoc_maxpacket);
981 mutex_unlock(&opts->lock);
982
983 return result;
984 }
985
986 static ssize_t f_ss_opts_isoc_maxpacket_store(struct config_item *item,
987 const char *page, size_t len)
988 {
989 struct f_ss_opts *opts = to_f_ss_opts(item);
990 int ret;
991 u16 num;
992
993 mutex_lock(&opts->lock);
994 if (opts->refcnt) {
995 ret = -EBUSY;
996 goto end;
997 }
998
999 ret = kstrtou16(page, 0, &num);
1000 if (ret)
1001 goto end;
1002
1003 if (num > 1024) {
1004 ret = -EINVAL;
1005 goto end;
1006 }
1007
1008 opts->isoc_maxpacket = num;
1009 ret = len;
1010 end:
1011 mutex_unlock(&opts->lock);
1012 return ret;
1013 }
1014
1015 CONFIGFS_ATTR(f_ss_opts_, isoc_maxpacket);
1016
1017 static ssize_t f_ss_opts_isoc_mult_show(struct config_item *item, char *page)
1018 {
1019 struct f_ss_opts *opts = to_f_ss_opts(item);
1020 int result;
1021
1022 mutex_lock(&opts->lock);
1023 result = sprintf(page, "%u\n", opts->isoc_mult);
1024 mutex_unlock(&opts->lock);
1025
1026 return result;
1027 }
1028
1029 static ssize_t f_ss_opts_isoc_mult_store(struct config_item *item,
1030 const char *page, size_t len)
1031 {
1032 struct f_ss_opts *opts = to_f_ss_opts(item);
1033 int ret;
1034 u8 num;
1035
1036 mutex_lock(&opts->lock);
1037 if (opts->refcnt) {
1038 ret = -EBUSY;
1039 goto end;
1040 }
1041
1042 ret = kstrtou8(page, 0, &num);
1043 if (ret)
1044 goto end;
1045
1046 if (num > 2) {
1047 ret = -EINVAL;
1048 goto end;
1049 }
1050
1051 opts->isoc_mult = num;
1052 ret = len;
1053 end:
1054 mutex_unlock(&opts->lock);
1055 return ret;
1056 }
1057
1058 CONFIGFS_ATTR(f_ss_opts_, isoc_mult);
1059
1060 static ssize_t f_ss_opts_isoc_maxburst_show(struct config_item *item, char *page)
1061 {
1062 struct f_ss_opts *opts = to_f_ss_opts(item);
1063 int result;
1064
1065 mutex_lock(&opts->lock);
1066 result = sprintf(page, "%u\n", opts->isoc_maxburst);
1067 mutex_unlock(&opts->lock);
1068
1069 return result;
1070 }
1071
1072 static ssize_t f_ss_opts_isoc_maxburst_store(struct config_item *item,
1073 const char *page, size_t len)
1074 {
1075 struct f_ss_opts *opts = to_f_ss_opts(item);
1076 int ret;
1077 u8 num;
1078
1079 mutex_lock(&opts->lock);
1080 if (opts->refcnt) {
1081 ret = -EBUSY;
1082 goto end;
1083 }
1084
1085 ret = kstrtou8(page, 0, &num);
1086 if (ret)
1087 goto end;
1088
1089 if (num > 15) {
1090 ret = -EINVAL;
1091 goto end;
1092 }
1093
1094 opts->isoc_maxburst = num;
1095 ret = len;
1096 end:
1097 mutex_unlock(&opts->lock);
1098 return ret;
1099 }
1100
1101 CONFIGFS_ATTR(f_ss_opts_, isoc_maxburst);
1102
1103 static ssize_t f_ss_opts_bulk_buflen_show(struct config_item *item, char *page)
1104 {
1105 struct f_ss_opts *opts = to_f_ss_opts(item);
1106 int result;
1107
1108 mutex_lock(&opts->lock);
1109 result = sprintf(page, "%u\n", opts->bulk_buflen);
1110 mutex_unlock(&opts->lock);
1111
1112 return result;
1113 }
1114
1115 static ssize_t f_ss_opts_bulk_buflen_store(struct config_item *item,
1116 const char *page, size_t len)
1117 {
1118 struct f_ss_opts *opts = to_f_ss_opts(item);
1119 int ret;
1120 u32 num;
1121
1122 mutex_lock(&opts->lock);
1123 if (opts->refcnt) {
1124 ret = -EBUSY;
1125 goto end;
1126 }
1127
1128 ret = kstrtou32(page, 0, &num);
1129 if (ret)
1130 goto end;
1131
1132 opts->bulk_buflen = num;
1133 ret = len;
1134 end:
1135 mutex_unlock(&opts->lock);
1136 return ret;
1137 }
1138
1139 CONFIGFS_ATTR(f_ss_opts_, bulk_buflen);
1140
1141 static ssize_t f_ss_opts_bulk_qlen_show(struct config_item *item, char *page)
1142 {
1143 struct f_ss_opts *opts = to_f_ss_opts(item);
1144 int result;
1145
1146 mutex_lock(&opts->lock);
1147 result = sprintf(page, "%u\n", opts->bulk_qlen);
1148 mutex_unlock(&opts->lock);
1149
1150 return result;
1151 }
1152
1153 static ssize_t f_ss_opts_bulk_qlen_store(struct config_item *item,
1154 const char *page, size_t len)
1155 {
1156 struct f_ss_opts *opts = to_f_ss_opts(item);
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_qlen = num;
1171 ret = len;
1172 end:
1173 mutex_unlock(&opts->lock);
1174 return ret;
1175 }
1176
1177 CONFIGFS_ATTR(f_ss_opts_, bulk_qlen);
1178
1179 static ssize_t f_ss_opts_iso_qlen_show(struct config_item *item, char *page)
1180 {
1181 struct f_ss_opts *opts = to_f_ss_opts(item);
1182 int result;
1183
1184 mutex_lock(&opts->lock);
1185 result = sprintf(page, "%u\n", opts->iso_qlen);
1186 mutex_unlock(&opts->lock);
1187
1188 return result;
1189 }
1190
1191 static ssize_t f_ss_opts_iso_qlen_store(struct config_item *item,
1192 const char *page, size_t len)
1193 {
1194 struct f_ss_opts *opts = to_f_ss_opts(item);
1195 int ret;
1196 u32 num;
1197
1198 mutex_lock(&opts->lock);
1199 if (opts->refcnt) {
1200 ret = -EBUSY;
1201 goto end;
1202 }
1203
1204 ret = kstrtou32(page, 0, &num);
1205 if (ret)
1206 goto end;
1207
1208 opts->iso_qlen = num;
1209 ret = len;
1210 end:
1211 mutex_unlock(&opts->lock);
1212 return ret;
1213 }
1214
1215 CONFIGFS_ATTR(f_ss_opts_, iso_qlen);
1216
1217 static struct configfs_attribute *ss_attrs[] = {
1218 &f_ss_opts_attr_pattern,
1219 &f_ss_opts_attr_isoc_interval,
1220 &f_ss_opts_attr_isoc_maxpacket,
1221 &f_ss_opts_attr_isoc_mult,
1222 &f_ss_opts_attr_isoc_maxburst,
1223 &f_ss_opts_attr_bulk_buflen,
1224 &f_ss_opts_attr_bulk_qlen,
1225 &f_ss_opts_attr_iso_qlen,
1226 NULL,
1227 };
1228
1229 static const struct config_item_type ss_func_type = {
1230 .ct_item_ops = &ss_item_ops,
1231 .ct_attrs = ss_attrs,
1232 .ct_owner = THIS_MODULE,
1233 };
1234
1235 static void source_sink_free_instance(struct usb_function_instance *fi)
1236 {
1237 struct f_ss_opts *ss_opts;
1238
1239 ss_opts = container_of(fi, struct f_ss_opts, func_inst);
1240 kfree(ss_opts);
1241 }
1242
1243 static struct usb_function_instance *source_sink_alloc_inst(void)
1244 {
1245 struct f_ss_opts *ss_opts;
1246
1247 ss_opts = kzalloc(sizeof(*ss_opts), GFP_KERNEL);
1248 if (!ss_opts)
1249 return ERR_PTR(-ENOMEM);
1250 mutex_init(&ss_opts->lock);
1251 ss_opts->func_inst.free_func_inst = source_sink_free_instance;
1252 ss_opts->isoc_interval = GZERO_ISOC_INTERVAL;
1253 ss_opts->isoc_maxpacket = GZERO_ISOC_MAXPACKET;
1254 ss_opts->bulk_buflen = GZERO_BULK_BUFLEN;
1255 ss_opts->bulk_qlen = GZERO_SS_BULK_QLEN;
1256 ss_opts->iso_qlen = GZERO_SS_ISO_QLEN;
1257
1258 config_group_init_type_name(&ss_opts->func_inst.group, "",
1259 &ss_func_type);
1260
1261 return &ss_opts->func_inst;
1262 }
1263 DECLARE_USB_FUNCTION(SourceSink, source_sink_alloc_inst,
1264 source_sink_alloc_func);
1265
1266 static int __init sslb_modinit(void)
1267 {
1268 int ret;
1269
1270 ret = usb_function_register(&SourceSinkusb_func);
1271 if (ret)
1272 return ret;
1273 ret = lb_modinit();
1274 if (ret)
1275 usb_function_unregister(&SourceSinkusb_func);
1276 return ret;
1277 }
1278 static void __exit sslb_modexit(void)
1279 {
1280 usb_function_unregister(&SourceSinkusb_func);
1281 lb_modexit();
1282 }
1283 module_init(sslb_modinit);
1284 module_exit(sslb_modexit);
1285
1286 MODULE_LICENSE("GPL");
Linux with added FPC-III support