aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/gadget/f_sourcesink.c
blob: 6d3cc443d914010d6ee7fafac601f3980e04ccf8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
/*
 * f_sourcesink.c - USB peripheral source/sink configuration driver
 *
 * Copyright (C) 2003-2008 David Brownell
 * Copyright (C) 2008 by Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/* #define VERBOSE_DEBUG */

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/device.h>

#include "g_zero.h"
#include "gadget_chips.h"


/*
 * SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripheral
 * controller drivers.
 *
 * This just sinks bulk packets OUT to the peripheral and sources them IN
 * to the host, optionally with specific data patterns for integrity tests.
 * As such it supports basic functionality and load tests.
 *
 * In terms of control messaging, this supports all the standard requests
 * plus two that support control-OUT tests.  If the optional "autoresume"
 * mode is enabled, it provides good functional coverage for the "USBCV"
 * test harness from USB-IF.
 *
 * Note that because this doesn't queue more than one request at a time,
 * some other function must be used to test queueing logic.  The network
 * link (g_ether) is the best overall option for that, since its TX and RX
 * queues are relatively independent, will receive a range of packet sizes,
 * and can often be made to run out completely.  Those issues are important
 * when stress testing peripheral controller drivers.
 *
 *
 * This is currently packaged as a configuration driver, which can't be
 * combined with other functions to make composite devices.  However, it
 * can be combined with other independent configurations.
 */
struct f_sourcesink {
	struct usb_function	function;

	struct usb_ep		*in_ep;
	struct usb_ep		*out_ep;
};

static inline struct f_sourcesink *func_to_ss(struct usb_function *f)
{
	return container_of(f, struct f_sourcesink, function);
}

static unsigned pattern;
module_param(pattern, uint, 0);
MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63 ");

/*-------------------------------------------------------------------------*/

static struct usb_interface_descriptor source_sink_intf = {
	.bLength =		sizeof source_sink_intf,
	.bDescriptorType =	USB_DT_INTERFACE,

	.bNumEndpoints =	2,
	.bInterfaceClass =	USB_CLASS_VENDOR_SPEC,
	/* .iInterface = DYNAMIC */
};

/* full speed support: */

static struct usb_endpoint_descriptor fs_source_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

static struct usb_endpoint_descriptor fs_sink_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_OUT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

static struct usb_descriptor_header *fs_source_sink_descs[] = {
	(struct usb_descriptor_header *) &source_sink_intf,
	(struct usb_descriptor_header *) &fs_sink_desc,
	(struct usb_descriptor_header *) &fs_source_desc,
	NULL,
};

/* high speed support: */

static struct usb_endpoint_descriptor hs_source_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(512),
};

static struct usb_endpoint_descriptor hs_sink_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(512),
};

static struct usb_descriptor_header *hs_source_sink_descs[] = {
	(struct usb_descriptor_header *) &source_sink_intf,
	(struct usb_descriptor_header *) &hs_source_desc,
	(struct usb_descriptor_header *) &hs_sink_desc,
	NULL,
};

/* function-specific strings: */

static struct usb_string strings_sourcesink[] = {
	[0].s = "source and sink data",
	{  }			/* end of list */
};

static struct usb_gadget_strings stringtab_sourcesink = {
	.language	= 0x0409,	/* en-us */
	.strings	= strings_sourcesink,
};

static struct usb_gadget_strings *sourcesink_strings[] = {
	&stringtab_sourcesink,
	NULL,
};

/*-------------------------------------------------------------------------*/

static int __init
sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
{
	struct usb_composite_dev *cdev = c->cdev;
	struct f_sourcesink	*ss = func_to_ss(f);
	int	id;

	/* allocate interface ID(s) */
	id = usb_interface_id(c, f);
	if (id < 0)
		return id;
	source_sink_intf.bInterfaceNumber = id;

	/* allocate endpoints */
	ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
	if (!ss->in_ep) {
autoconf_fail:
		ERROR(cdev, "%s: can't autoconfigure on %s\n",
			f->name, cdev->gadget->name);
		return -ENODEV;
	}
	ss->in_ep->driver_data = cdev;	/* claim */

	ss->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
	if (!ss->out_ep)
		goto autoconf_fail;
	ss->out_ep->driver_data = cdev;	/* claim */

	/* support high speed hardware */
	if (gadget_is_dualspeed(c->cdev->gadget)) {
		hs_source_desc.bEndpointAddress =
				fs_source_desc.bEndpointAddress;
		hs_sink_desc.bEndpointAddress =
				fs_sink_desc.bEndpointAddress;
		f->hs_descriptors = hs_source_sink_descs;
	}

	DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
			gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
			f->name, ss->in_ep->name, ss->out_ep->name);
	return 0;
}

static void
sourcesink_unbind(struct usb_configuration *c, struct usb_function *f)
{
	kfree(func_to_ss(f));
}

/* optionally require specific source/sink data patterns  */
static int check_read_data(struct f_sourcesink *ss, struct usb_request *req)
{
	unsigned		i;
	u8			*buf = req->buf;
	struct usb_composite_dev *cdev = ss->function.config->cdev;

	for (i = 0; i < req->actual; i++, buf++) {
		switch (pattern) {

		/* all-zeroes has no synchronization issues */
		case 0:
			if (*buf == 0)
				continue;
			break;

		/* "mod63" stays in sync with short-terminated transfers,
		 * OR otherwise when host and gadget agree on how large
		 * each usb transfer request should be.  Resync is done
		 * with set_interface or set_config.  (We *WANT* it to
		 * get quickly out of sync if controllers or their drivers
		 * stutter for any reason, including buffer duplcation...)
		 */
		case 1:
			if (*buf == (u8)(i % 63))
				continue;
			break;
		}
		ERROR(cdev, "bad OUT byte, buf[%d] = %d\n", i, *buf);
		usb_ep_set_halt(ss->out_ep);
		return -EINVAL;
	}
	return 0;
}

static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
{
	unsigned	i;
	u8		*buf = req->buf;

	switch (pattern) {
	case 0:
		memset(req->buf, 0, req->length);
		break;
	case 1:
		for  (i = 0; i < req->length; i++)
			*buf++ = (u8) (i % 63);
		break;
	}
}

static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct f_sourcesink	*ss = ep->driver_data;
	struct usb_composite_dev *cdev = ss->function.config->cdev;
	int			status = req->status;

	switch (status) {

	case 0:				/* normal completion? */
		if (ep == ss->out_ep) {
			check_read_data(ss, req);
			memset(req->buf, 0x55, req->length);
		} else
			reinit_write_data(ep, req);
		break;

	/* this endpoint is normally active while we're configured */
	case -ECONNABORTED:		/* hardware forced ep reset */
	case -ECONNRESET:		/* request dequeued */
	case -ESHUTDOWN:		/* disconnect from host */
		VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
				req->actual, req->length);
		if (ep == ss->out_ep)
			check_read_data(ss, req);
		free_ep_req(ep, req);
		return;

	case -EOVERFLOW:		/* buffer overrun on read means that
					 * we didn't provide a big enough
					 * buffer.
					 */
	default:
#if 1
		DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
				status, req->actual, req->length);
#endif
	case -EREMOTEIO:		/* short read */
		break;
	}

	status = usb_ep_queue(ep, req, GFP_ATOMIC);
	if (status) {
		ERROR(cdev, "kill %s:  resubmit %d bytes --> %d\n",
				ep->name, req->length, status);
		usb_ep_set_halt(ep);
		/* FIXME recover later ... somehow */
	}
}

static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in)
{
	struct usb_ep		*ep;
	struct usb_request	*req;
	int			status;

	ep = is_in ? ss->in_ep : ss->out_ep;
	req = alloc_ep_req(ep);
	if (!req)
		return -ENOMEM;

	req->complete = source_sink_complete;
	if (is_in)
		reinit_write_data(ep, req);
	else
		memset(req->buf, 0x55, req->length);

	status = usb_ep_queue(ep, req, GFP_ATOMIC);
	if (status) {
		struct usb_composite_dev	*cdev;

		cdev = ss->function.config->cdev;
		ERROR(cdev, "start %s %s --> %d\n",
				is_in ? "IN" : "OUT",
				ep->name, status);
		free_ep_req(ep, req);
	}

	return status;
}

static void disable_source_sink(struct f_sourcesink *ss)
{
	struct usb_composite_dev	*cdev;

	cdev = ss->function.config->cdev;
	disable_endpoints(cdev, ss->in_ep, ss->out_ep);
	VDBG(cdev, "%s disabled\n", ss->function.name);
}

static int
enable_source_sink(struct usb_composite_dev *cdev, struct f_sourcesink *ss)
{
	int					result = 0;
	const struct usb_endpoint_descriptor	*src, *sink;
	struct usb_ep				*ep;

	src = ep_choose(cdev->gadget, &hs_source_desc, &fs_source_desc);
	sink = ep_choose(cdev->gadget, &hs_sink_desc, &fs_sink_desc);

	/* one endpoint writes (sources) zeroes IN (to the host) */
	ep = ss->in_ep;
	result = usb_ep_enable(ep, src);
	if (result < 0)
		return result;
	ep->driver_data = ss;

	result = source_sink_start_ep(ss, true);
	if (result < 0) {
fail:
		ep = ss->in_ep;
		usb_ep_disable(ep);
		ep->driver_data = NULL;
		return result;
	}

	/* one endpoint reads (sinks) anything OUT (from the host) */
	ep = ss->out_ep;
	result = usb_ep_enable(ep, sink);
	if (result < 0)
		goto fail;
	ep->driver_data = ss;

	result = source_sink_start_ep(ss, false);
	if (result < 0) {
		usb_ep_disable(ep);
		ep->driver_data = NULL;
		goto fail;
	}

	DBG(cdev, "%s enabled\n", ss->function.name);
	return result;
}

static int sourcesink_set_alt(struct usb_function *f,
		unsigned intf, unsigned alt)
{
	struct f_sourcesink	*ss = func_to_ss(f);
	struct usb_composite_dev *cdev = f->config->cdev;

	/* we know alt is zero */
	if (ss->in_ep->driver_data)
		disable_source_sink(ss);
	return enable_source_sink(cdev, ss);
}

static void sourcesink_disable(struct usb_function *f)
{
	struct f_sourcesink	*ss = func_to_ss(f);

	disable_source_sink(ss);
}

/*-------------------------------------------------------------------------*/

static int __init sourcesink_bind_config(struct usb_configuration *c)
{
	struct f_sourcesink	*ss;
	int			status;

	ss = kzalloc(sizeof *ss, GFP_KERNEL);
	if (!ss)
		return -ENOMEM;

	ss->function.name = "source/sink";
	ss->function.descriptors = fs_source_sink_descs;
	ss->function.bind = sourcesink_bind;
	ss->function.unbind = sourcesink_unbind;
	ss->function.set_alt = sourcesink_set_alt;
	ss->function.disable = sourcesink_disable;

	status = usb_add_function(c, &ss->function);
	if (status)
		kfree(ss);
	return status;
}

static int sourcesink_setup(struct usb_configuration *c,
		const struct usb_ctrlrequest *ctrl)
{
	struct usb_request	*req = c->cdev->req;
	int			value = -EOPNOTSUPP;
	u16			w_index = le16_to_cpu(ctrl->wIndex);
	u16			w_value = le16_to_cpu(ctrl->wValue);
	u16			w_length = le16_to_cpu(ctrl->wLength);

	/* composite driver infrastructure handles everything except
	 * the two control test requests.
	 */
	switch (ctrl->bRequest) {

	/*
	 * These are the same vendor-specific requests supported by
	 * Intel's USB 2.0 compliance test devices.  We exceed that
	 * device spec by allowing multiple-packet requests.
	 *
	 * NOTE:  the Control-OUT data stays in req->buf ... better
	 * would be copying it into a scratch buffer, so that other
	 * requests may safely intervene.
	 */
	case 0x5b:	/* control WRITE test -- fill the buffer */
		if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
			goto unknown;
		if (w_value || w_index)
			break;
		/* just read that many bytes into the buffer */
		if (w_length > req->length)
			break;
		value = w_length;
		break;
	case 0x5c:	/* control READ test -- return the buffer */
		if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
			goto unknown;
		if (w_value || w_index)
			break;
		/* expect those bytes are still in the buffer; send back */
		if (w_length > req->length)
			break;
		value = w_length;
		break;

	default:
unknown:
		VDBG(c->cdev,
			"unknown control req%02x.%02x v%04x i%04x l%d\n",
			ctrl->bRequestType, ctrl->bRequest,
			w_value, w_index, w_length);
	}

	/* respond with data transfer or status phase? */
	if (value >= 0) {
		VDBG(c->cdev, "source/sink req%02x.%02x v%04x i%04x l%d\n",
			ctrl->bRequestType, ctrl->bRequest,
			w_value, w_index, w_length);
		req->zero = 0;
		req->length = value;
		value = usb_ep_queue(c->cdev->gadget->ep0, req, GFP_ATOMIC);
		if (value < 0)
			ERROR(c->cdev, "source/sinkc response, err %d\n",
					value);
	}

	/* device either stalls (value < 0) or reports success */
	return value;
}

static struct usb_configuration sourcesink_driver = {
	.label		= "source/sink",
	.strings	= sourcesink_strings,
	.bind		= sourcesink_bind_config,
	.setup		= sourcesink_setup,
	.bConfigurationValue = 3,
	.bmAttributes	= USB_CONFIG_ATT_SELFPOWER,
	/* .iConfiguration = DYNAMIC */
};

/**
 * sourcesink_add - add a source/sink testing configuration to a device
 * @cdev: the device to support the configuration
 */
int __init sourcesink_add(struct usb_composite_dev *cdev, bool autoresume)
{
	int id;

	/* allocate string ID(s) */
	id = usb_string_id(cdev);
	if (id < 0)
		return id;
	strings_sourcesink[0].id = id;

	source_sink_intf.iInterface = id;
	sourcesink_driver.iConfiguration = id;

	/* support autoresume for remote wakeup testing */
	if (autoresume)
		sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;

	/* support OTG systems */
	if (gadget_is_otg(cdev->gadget)) {
		sourcesink_driver.descriptors = otg_desc;
		sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
	}

	return usb_add_config(cdev, &sourcesink_driver);
}