aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/gadget/core.c
blob: 67b6681a6cce225ffefc49bfa64d10e910915fb5 (plain)
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
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
/*
 * (C) Copyright 2003
 * Gerry Hamel, geh@ti.com, Texas Instruments
 *
 * Based on
 * linux/drivers/usbd/usbd.c.c - USB Device Core Layer
 *
 * Copyright (c) 2000, 2001, 2002 Lineo
 * Copyright (c) 2001 Hewlett Packard
 *
 * By:
 *	Stuart Lynne <sl@lineo.com>,
 *	Tom Rushworth <tbr@lineo.com>,
 *	Bruce Balden <balden@lineo.com>
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <malloc.h>
#include <usbdevice.h>

#define MAX_INTERFACES 2


int maxstrings = 20;

/* Global variables ************************************************************************** */

struct usb_string_descriptor **usb_strings;

int usb_devices;

extern struct usb_function_driver ep0_driver;

int registered_functions;
int registered_devices;

char *usbd_device_events[] = {
	"DEVICE_UNKNOWN",
	"DEVICE_INIT",
	"DEVICE_CREATE",
	"DEVICE_HUB_CONFIGURED",
	"DEVICE_RESET",
	"DEVICE_ADDRESS_ASSIGNED",
	"DEVICE_CONFIGURED",
	"DEVICE_SET_INTERFACE",
	"DEVICE_SET_FEATURE",
	"DEVICE_CLEAR_FEATURE",
	"DEVICE_DE_CONFIGURED",
	"DEVICE_BUS_INACTIVE",
	"DEVICE_BUS_ACTIVITY",
	"DEVICE_POWER_INTERRUPTION",
	"DEVICE_HUB_RESET",
	"DEVICE_DESTROY",
	"DEVICE_FUNCTION_PRIVATE",
};

char *usbd_device_states[] = {
	"STATE_INIT",
	"STATE_CREATED",
	"STATE_ATTACHED",
	"STATE_POWERED",
	"STATE_DEFAULT",
	"STATE_ADDRESSED",
	"STATE_CONFIGURED",
	"STATE_UNKNOWN",
};

char *usbd_device_requests[] = {
	"GET STATUS",		/* 0 */
	"CLEAR FEATURE",	/* 1 */
	"RESERVED",		/* 2 */
	"SET FEATURE",		/* 3 */
	"RESERVED",		/* 4 */
	"SET ADDRESS",		/* 5 */
	"GET DESCRIPTOR",	/* 6 */
	"SET DESCRIPTOR",	/* 7 */
	"GET CONFIGURATION",	/* 8 */
	"SET CONFIGURATION",	/* 9 */
	"GET INTERFACE",	/* 10 */
	"SET INTERFACE",	/* 11 */
	"SYNC FRAME",		/* 12 */
};

char *usbd_device_descriptors[] = {
	"UNKNOWN",		/* 0 */
	"DEVICE",		/* 1 */
	"CONFIG",		/* 2 */
	"STRING",		/* 3 */
	"INTERFACE",		/* 4 */
	"ENDPOINT",		/* 5 */
	"DEVICE QUALIFIER",	/* 6 */
	"OTHER SPEED",		/* 7 */
	"INTERFACE POWER",	/* 8 */
};

char *usbd_device_status[] = {
	"USBD_OPENING",
	"USBD_OK",
	"USBD_SUSPENDED",
	"USBD_CLOSING",
};


/* Descriptor support functions ************************************************************** */


/**
 * usbd_get_string - find and return a string descriptor
 * @index: string index to return
 *
 * Find an indexed string and return a pointer to a it.
 */
struct usb_string_descriptor *usbd_get_string (__u8 index)
{
	if (index >= maxstrings) {
		return NULL;
	}
	return usb_strings[index];
}


/* Access to device descriptor functions ***************************************************** */


/* *
 * usbd_device_configuration_instance - find a configuration instance for this device
 * @device:
 * @configuration: index to configuration, 0 - N-1
 *
 * Get specifed device configuration. Index should be bConfigurationValue-1.
 */
static struct usb_configuration_instance *usbd_device_configuration_instance (struct usb_device_instance *device,
		unsigned int port, unsigned int configuration)
{
	if (configuration >= device->configurations)
		return NULL;

	return device->configuration_instance_array + configuration;
}


/* *
 * usbd_device_interface_instance
 * @device:
 * @configuration: index to configuration, 0 - N-1
 * @interface: index to interface
 *
 * Return the specified interface descriptor for the specified device.
 */
struct usb_interface_instance *usbd_device_interface_instance (struct usb_device_instance *device, int port, int configuration, int interface)
{
	struct usb_configuration_instance *configuration_instance;

	if ((configuration_instance = usbd_device_configuration_instance (device, port, configuration)) == NULL) {
		return NULL;
	}
	if (interface >= configuration_instance->interfaces) {
		return NULL;
	}
	return configuration_instance->interface_instance_array + interface;
}

/* *
 * usbd_device_alternate_descriptor_list
 * @device:
 * @configuration: index to configuration, 0 - N-1
 * @interface: index to interface
 * @alternate: alternate setting
 *
 * Return the specified alternate descriptor for the specified device.
 */
struct usb_alternate_instance *usbd_device_alternate_instance (struct usb_device_instance *device, int port, int configuration, int interface, int alternate)
{
	struct usb_interface_instance *interface_instance;

	if ((interface_instance = usbd_device_interface_instance (device, port, configuration, interface)) == NULL) {
		return NULL;
	}

	if (alternate >= interface_instance->alternates) {
		return NULL;
	}

	return interface_instance->alternates_instance_array + alternate;
}


/* *
 * usbd_device_device_descriptor
 * @device: which device
 * @configuration: index to configuration, 0 - N-1
 * @port: which port
 *
 * Return the specified configuration descriptor for the specified device.
 */
struct usb_device_descriptor *usbd_device_device_descriptor (struct usb_device_instance *device, int port)
{
	return (device->device_descriptor);
}


/**
 * usbd_device_configuration_descriptor
 * @device: which device
 * @port: which port
 * @configuration: index to configuration, 0 - N-1
 *
 * Return the specified configuration descriptor for the specified device.
 */
struct usb_configuration_descriptor *usbd_device_configuration_descriptor (struct
									   usb_device_instance
									   *device, int port, int configuration)
{
	struct usb_configuration_instance *configuration_instance;
	if (!(configuration_instance = usbd_device_configuration_instance (device, port, configuration))) {
		return NULL;
	}
	return (configuration_instance->configuration_descriptor);
}


/**
 * usbd_device_interface_descriptor
 * @device: which device
 * @port: which port
 * @configuration: index to configuration, 0 - N-1
 * @interface: index to interface
 * @alternate: alternate setting
 *
 * Return the specified interface descriptor for the specified device.
 */
struct usb_interface_descriptor *usbd_device_interface_descriptor (struct usb_device_instance
								   *device, int port, int configuration, int interface, int alternate)
{
	struct usb_interface_instance *interface_instance;
	if (!(interface_instance = usbd_device_interface_instance (device, port, configuration, interface))) {
		return NULL;
	}
	if ((alternate < 0) || (alternate >= interface_instance->alternates)) {
		return NULL;
	}
	return (interface_instance->alternates_instance_array[alternate].interface_descriptor);
}

/**
 * usbd_device_endpoint_descriptor_index
 * @device: which device
 * @port: which port
 * @configuration: index to configuration, 0 - N-1
 * @interface: index to interface
 * @alternate: index setting
 * @index: which index
 *
 * Return the specified endpoint descriptor for the specified device.
 */
struct usb_endpoint_descriptor *usbd_device_endpoint_descriptor_index (struct usb_device_instance
								       *device, int port, int configuration, int interface, int alternate, int index)
{
	struct usb_alternate_instance *alternate_instance;

	if (!(alternate_instance = usbd_device_alternate_instance (device, port, configuration, interface, alternate))) {
		return NULL;
	}
	if (index >= alternate_instance->endpoints) {
		return NULL;
	}
	return *(alternate_instance->endpoints_descriptor_array + index);
}


/**
 * usbd_device_endpoint_transfersize
 * @device: which device
 * @port: which port
 * @configuration: index to configuration, 0 - N-1
 * @interface: index to interface
 * @index: which index
 *
 * Return the specified endpoint transfer size;
 */
int usbd_device_endpoint_transfersize (struct usb_device_instance *device, int port, int configuration, int interface, int alternate, int index)
{
	struct usb_alternate_instance *alternate_instance;

	if (!(alternate_instance = usbd_device_alternate_instance (device, port, configuration, interface, alternate))) {
		return 0;
	}
	if (index >= alternate_instance->endpoints) {
		return 0;
	}
	return *(alternate_instance->endpoint_transfersize_array + index);
}


/**
 * usbd_device_endpoint_descriptor
 * @device: which device
 * @port: which port
 * @configuration: index to configuration, 0 - N-1
 * @interface: index to interface
 * @alternate: alternate setting
 * @endpoint: which endpoint
 *
 * Return the specified endpoint descriptor for the specified device.
 */
struct usb_endpoint_descriptor *usbd_device_endpoint_descriptor (struct usb_device_instance *device, int port, int configuration, int interface, int alternate, int endpoint)
{
	struct usb_endpoint_descriptor *endpoint_descriptor;
	int i;

	for (i = 0; !(endpoint_descriptor = usbd_device_endpoint_descriptor_index (device, port, configuration, interface, alternate, i)); i++) {
		if (endpoint_descriptor->bEndpointAddress == endpoint) {
			return endpoint_descriptor;
		}
	}
	return NULL;
}

/**
 * usbd_endpoint_halted
 * @device: point to struct usb_device_instance
 * @endpoint: endpoint to check
 *
 * Return non-zero if endpoint is halted.
 */
int usbd_endpoint_halted (struct usb_device_instance *device, int endpoint)
{
	return (device->status == USB_STATUS_HALT);
}


/**
 * usbd_rcv_complete - complete a receive
 * @endpoint:
 * @len:
 * @urb_bad:
 *
 * Called from rcv interrupt to complete.
 */
void usbd_rcv_complete(struct usb_endpoint_instance *endpoint, int len, int urb_bad)
{
	if (endpoint) {
		struct urb *rcv_urb;

		/*usbdbg("len: %d urb: %p\n", len, endpoint->rcv_urb); */

		/* if we had an urb then update actual_length, dispatch if neccessary */
		if ((rcv_urb = endpoint->rcv_urb)) {

			/*usbdbg("actual: %d buffer: %d\n", */
			/*rcv_urb->actual_length, rcv_urb->buffer_length); */

			/* check the urb is ok, are we adding data less than the packetsize */
			if (!urb_bad && (len <= endpoint->rcv_packetSize)) {
			  /*usbdbg("updating actual_length by %d\n",len); */

				/* increment the received data size */
				rcv_urb->actual_length += len;

			} else {
				usberr(" RECV_ERROR actual: %d buffer: %d urb_bad: %d\n",
				       rcv_urb->actual_length, rcv_urb->buffer_length, urb_bad);

				rcv_urb->actual_length = 0;
				rcv_urb->status = RECV_ERROR;
			}
		} else {
			usberr("no rcv_urb!");
		}
	} else {
		usberr("no endpoint!");
	}

}

/**
 * usbd_tx_complete - complete a transmit
 * @endpoint:
 * @resetart:
 *
 * Called from tx interrupt to complete.
 */
void usbd_tx_complete (struct usb_endpoint_instance *endpoint)
{
	if (endpoint) {
		struct urb *tx_urb;

		/* if we have a tx_urb advance or reset, finish if complete */
		if ((tx_urb = endpoint->tx_urb)) {
			int sent = endpoint->last;
			endpoint->sent += sent;
			endpoint->last -= sent;

			if( (endpoint->tx_urb->actual_length - endpoint->sent) <= 0 ) {
				tx_urb->actual_length = 0;
				endpoint->sent = 0;
				endpoint->last = 0;

				/* Remove from active, save for re-use */
				urb_detach(tx_urb);
				urb_append(&endpoint->done, tx_urb);
				/*usbdbg("done->next %p, tx_urb %p, done %p", */
				/*	 endpoint->done.next, tx_urb, &endpoint->done); */

				endpoint->tx_urb = first_urb_detached(&endpoint->tx);
				if( endpoint->tx_urb ) {
					endpoint->tx_queue--;
					usbdbg("got urb from tx list");
				}
				if( !endpoint->tx_urb ) {
					/*usbdbg("taking urb from done list"); */
					endpoint->tx_urb = first_urb_detached(&endpoint->done);
				}
				if( !endpoint->tx_urb ) {
					usbdbg("allocating new urb for tx_urb");
					endpoint->tx_urb = usbd_alloc_urb(tx_urb->device, endpoint);
				}
			}
		}
	}
}

/* URB linked list functions ***************************************************** */

/*
 * Initialize an urb_link to be a single element list.
 * If the urb_link is being used as a distinguished list head
 * the list is empty when the head is the only link in the list.
 */
void urb_link_init (urb_link * ul)
{
	if (ul) {
		ul->prev = ul->next = ul;
	}
}

/*
 * Detach an urb_link from a list, and set it
 * up as a single element list, so no dangling
 * pointers can be followed, and so it can be
 * joined to another list if so desired.
 */
void urb_detach (struct urb *urb)
{
	if (urb) {
		urb_link *ul = &urb->link;
		ul->next->prev = ul->prev;
		ul->prev->next = ul->next;
		urb_link_init (ul);
	}
}

/*
 * Return the first urb_link in a list with a distinguished
 * head "hd", or NULL if the list is empty.  This will also
 * work as a predicate, returning NULL if empty, and non-NULL
 * otherwise.
 */
urb_link *first_urb_link (urb_link * hd)
{
	urb_link *nx;
	if (NULL != hd && NULL != (nx = hd->next) && nx != hd) {
		/* There is at least one element in the list */
		/* (besides the distinguished head). */
		return (nx);
	}
	/* The list is empty */
	return (NULL);
}

/*
 * Return the first urb in a list with a distinguished
 * head "hd", or NULL if the list is empty.
 */
struct urb *first_urb (urb_link * hd)
{
	urb_link *nx;
	if (NULL == (nx = first_urb_link (hd))) {
		/* The list is empty */
		return (NULL);
	}
	return (p2surround (struct urb, link, nx));
}

/*
 * Detach and return the first urb in a list with a distinguished
 * head "hd", or NULL if the list is empty.
 *
 */
struct urb *first_urb_detached (urb_link * hd)
{
	struct urb *urb;
	if ((urb = first_urb (hd))) {
		urb_detach (urb);
	}
	return urb;
}


/*
 * Append an urb_link (or a whole list of
 * urb_links) to the tail of another list
 * of urb_links.
 */
void urb_append (urb_link * hd, struct urb *urb)
{
	if (hd && urb) {
		urb_link *new = &urb->link;

		/* This allows the new urb to be a list of urbs, */
		/* with new pointing at the first, but the link */
		/* must be initialized. */
		/* Order is important here... */
		urb_link *pul = hd->prev;
		new->prev->next = hd;
		hd->prev = new->prev;
		new->prev = pul;
		pul->next = new;
	}
}

/* URB create/destroy functions ***************************************************** */

/**
 * usbd_alloc_urb - allocate an URB appropriate for specified endpoint
 * @device: device instance
 * @endpoint: endpoint
 *
 * Allocate an urb structure. The usb device urb structure is used to
 * contain all data associated with a transfer, including a setup packet for
 * control transfers.
 *
 * NOTE: endpoint_address MUST contain a direction flag.
 */
struct urb *usbd_alloc_urb (struct usb_device_instance *device,
			    struct usb_endpoint_instance *endpoint)
{
	struct urb *urb;

	if (!(urb = (struct urb *) malloc (sizeof (struct urb)))) {
		usberr (" F A T A L:  malloc(%zu) FAILED!!!!",
			sizeof (struct urb));
		return NULL;
	}

	/* Fill in known fields */
	memset (urb, 0, sizeof (struct urb));
	urb->endpoint = endpoint;
	urb->device = device;
	urb->buffer = (u8 *) urb->buffer_data;
	urb->buffer_length = sizeof (urb->buffer_data);

	urb_link_init (&urb->link);

	return urb;
}

/**
 * usbd_dealloc_urb - deallocate an URB and associated buffer
 * @urb: pointer to an urb structure
 *
 * Deallocate an urb structure and associated data.
 */
void usbd_dealloc_urb (struct urb *urb)
{
	if (urb) {
		free (urb);
	}
}

/* Event signaling functions ***************************************************** */

/**
 * usbd_device_event - called to respond to various usb events
 * @device: pointer to struct device
 * @event: event to respond to
 *
 * Used by a Bus driver to indicate an event.
 */
void usbd_device_event_irq (struct usb_device_instance *device, usb_device_event_t event, int data)
{
	usb_device_state_t state;

	if (!device || !device->bus) {
		usberr("(%p,%d) NULL device or device->bus", device, event);
		return;
	}

	state = device->device_state;

	usbinfo("%s", usbd_device_events[event]);

	switch (event) {
	case DEVICE_UNKNOWN:
		break;
	case DEVICE_INIT:
		device->device_state = STATE_INIT;
		break;

	case DEVICE_CREATE:
		device->device_state = STATE_ATTACHED;
		break;

	case DEVICE_HUB_CONFIGURED:
		device->device_state = STATE_POWERED;
		break;

	case DEVICE_RESET:
		device->device_state = STATE_DEFAULT;
		device->address = 0;
		break;

	case DEVICE_ADDRESS_ASSIGNED:
		device->device_state = STATE_ADDRESSED;
		break;

	case DEVICE_CONFIGURED:
		device->device_state = STATE_CONFIGURED;
		break;

	case DEVICE_DE_CONFIGURED:
		device->device_state = STATE_ADDRESSED;
		break;

	case DEVICE_BUS_INACTIVE:
		if (device->status != USBD_CLOSING) {
			device->status = USBD_SUSPENDED;
		}
		break;
	case DEVICE_BUS_ACTIVITY:
		if (device->status != USBD_CLOSING) {
			device->status = USBD_OK;
		}
		break;

	case DEVICE_SET_INTERFACE:
		break;
	case DEVICE_SET_FEATURE:
		break;
	case DEVICE_CLEAR_FEATURE:
		break;

	case DEVICE_POWER_INTERRUPTION:
		device->device_state = STATE_POWERED;
		break;
	case DEVICE_HUB_RESET:
		device->device_state = STATE_ATTACHED;
		break;
	case DEVICE_DESTROY:
		device->device_state = STATE_UNKNOWN;
		break;

	case DEVICE_FUNCTION_PRIVATE:
		break;

	default:
		usbdbg("event %d - not handled",event);
		break;
	}
	/*usbdbg("%s event: %d oldstate: %d newstate: %d status: %d address: %d",
		device->name, event, state,
		device->device_state, device->status, device->address); */

	/* tell the bus interface driver */
	if( device->event ) {
		/* usbdbg("calling device->event"); */
		device->event(device, event, data);
	}
}