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-rw-r--r--drivers/usb/gadget/zero.c1162
1 files changed, 94 insertions, 1068 deletions
diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index fce4924dbbe8..aa0bd4f126a1 100644
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -1,8 +1,8 @@
1/* 1/*
2 * zero.c -- Gadget Zero, for USB development 2 * zero.c -- Gadget Zero, for USB development
3 * 3 *
4 * Copyright (C) 2003-2007 David Brownell 4 * Copyright (C) 2003-2008 David Brownell
5 * All rights reserved. 5 * Copyright (C) 2008 by Nokia Corporation
6 * 6 *
7 * This program is free software; you can redistribute it and/or modify 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 8 * it under the terms of the GNU General Public License as published by
@@ -30,12 +30,7 @@
30 * 30 *
31 * It supports two similar configurations. One sinks whatever the usb host 31 * It supports two similar configurations. One sinks whatever the usb host
32 * writes, and in return sources zeroes. The other loops whatever the host 32 * writes, and in return sources zeroes. The other loops whatever the host
33 * writes back, so the host can read it. Module options include: 33 * writes back, so the host can read it.
34 *
35 * buflen=N default N=4096, buffer size used
36 * qlen=N default N=32, how many buffers in the loopback queue
37 * loopdefault default false, list loopback config first
38 * autoresume=N default N=0, seconds before triggering remote wakeup
39 * 34 *
40 * Many drivers will only have one configuration, letting them be much 35 * Many drivers will only have one configuration, letting them be much
41 * simpler if they also don't support high speed operation (like this 36 * simpler if they also don't support high speed operation (like this
@@ -47,94 +42,35 @@
47 * work with low capability USB controllers without four bulk endpoints. 42 * work with low capability USB controllers without four bulk endpoints.
48 */ 43 */
49 44
45/*
46 * driver assumes self-powered hardware, and
47 * has no way for users to trigger remote wakeup.
48 */
49
50/* #define VERBOSE_DEBUG */ 50/* #define VERBOSE_DEBUG */
51 51
52#include <linux/kernel.h> 52#include <linux/kernel.h>
53#include <linux/utsname.h> 53#include <linux/utsname.h>
54#include <linux/device.h> 54#include <linux/device.h>
55 55
56#include <linux/usb/ch9.h> 56#include "g_zero.h"
57#include <linux/usb/gadget.h>
58
59#include "gadget_chips.h" 57#include "gadget_chips.h"
60 58
61 59
62/*-------------------------------------------------------------------------*/ 60/*-------------------------------------------------------------------------*/
63 61
64#define DRIVER_VERSION "Earth Day 2008" 62#define DRIVER_VERSION "Cinco de Mayo 2008"
65 63
66static const char shortname[] = "zero";
67static const char longname[] = "Gadget Zero"; 64static const char longname[] = "Gadget Zero";
68 65
69static const char source_sink[] = "source and sink data"; 66unsigned buflen = 4096;
70static const char loopback[] = "loop input to output"; 67module_param(buflen, uint, 0);
71
72/*-------------------------------------------------------------------------*/
73
74/*
75 * driver assumes self-powered hardware, and
76 * has no way for users to trigger remote wakeup.
77 *
78 * this version autoconfigures as much as possible,
79 * which is reasonable for most "bulk-only" drivers.
80 */
81static const char *EP_IN_NAME; /* source */
82static const char *EP_OUT_NAME; /* sink */
83
84/*-------------------------------------------------------------------------*/
85
86/* big enough to hold our biggest descriptor */
87#define USB_BUFSIZ 256
88
89struct zero_dev {
90 spinlock_t lock;
91 struct usb_gadget *gadget;
92 struct usb_request *req; /* for control responses */
93
94 /* when configured, we have one of two configs:
95 * - source data (in to host) and sink it (out from host)
96 * - or loop it back (out from host back in to host)
97 */
98 u8 config;
99 struct usb_ep *in_ep, *out_ep;
100
101 /* autoresume timer */
102 struct timer_list resume;
103};
104
105#define DBG(d, fmt, args...) \
106 dev_dbg(&(d)->gadget->dev , fmt , ## args)
107#define VDBG(d, fmt, args...) \
108 dev_vdbg(&(d)->gadget->dev , fmt , ## args)
109#define ERROR(d, fmt, args...) \
110 dev_err(&(d)->gadget->dev , fmt , ## args)
111#define WARN(d, fmt, args...) \
112 dev_warn(&(d)->gadget->dev , fmt , ## args)
113#define INFO(d, fmt, args...) \
114 dev_info(&(d)->gadget->dev , fmt , ## args)
115
116/*-------------------------------------------------------------------------*/
117
118static unsigned buflen = 4096;
119static unsigned qlen = 32;
120static unsigned pattern = 0;
121
122module_param(buflen, uint, S_IRUGO);
123module_param(qlen, uint, S_IRUGO);
124module_param(pattern, uint, S_IRUGO|S_IWUSR);
125
126/*
127 * if it's nonzero, autoresume says how many seconds to wait
128 * before trying to wake up the host after suspend.
129 */
130static unsigned autoresume = 0;
131module_param(autoresume, uint, 0);
132 68
133/* 69/*
134 * Normally the "loopback" configuration is second (index 1) so 70 * Normally the "loopback" configuration is second (index 1) so
135 * it's not the default. Here's where to change that order, to 71 * it's not the default. Here's where to change that order, to
136 * work better with hosts where config changes are problematic. 72 * work better with hosts where config changes are problematic or
137 * Or controllers (like superh) that only support one config. 73 * controllers (like original superh) that only support one config.
138 */ 74 */
139static int loopdefault = 0; 75static int loopdefault = 0;
140module_param(loopdefault, bool, S_IRUGO|S_IWUSR); 76module_param(loopdefault, bool, S_IRUGO|S_IWUSR);
@@ -156,24 +92,6 @@ module_param(loopdefault, bool, S_IRUGO|S_IWUSR);
156 92
157/*-------------------------------------------------------------------------*/ 93/*-------------------------------------------------------------------------*/
158 94
159/*
160 * DESCRIPTORS ... most are static, but strings and (full)
161 * configuration descriptors are built on demand.
162 */
163
164#define STRING_MANUFACTURER 25
165#define STRING_PRODUCT 42
166#define STRING_SERIAL 101
167#define STRING_SOURCE_SINK 250
168#define STRING_LOOPBACK 251
169
170/*
171 * This device advertises two configurations; these numbers work
172 * on a pxa250 as well as more flexible hardware.
173 */
174#define CONFIG_SOURCE_SINK 3
175#define CONFIG_LOOPBACK 2
176
177static struct usb_device_descriptor device_desc = { 95static struct usb_device_descriptor device_desc = {
178 .bLength = sizeof device_desc, 96 .bLength = sizeof device_desc,
179 .bDescriptorType = USB_DT_DEVICE, 97 .bDescriptorType = USB_DT_DEVICE,
@@ -183,248 +101,64 @@ static struct usb_device_descriptor device_desc = {
183 101
184 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_NUM), 102 .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_NUM),
185 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_NUM), 103 .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_NUM),
186 .iManufacturer = STRING_MANUFACTURER,
187 .iProduct = STRING_PRODUCT,
188 .iSerialNumber = STRING_SERIAL,
189 .bNumConfigurations = 2, 104 .bNumConfigurations = 2,
190}; 105};
191 106
192static struct usb_config_descriptor source_sink_config = { 107#ifdef CONFIG_USB_OTG
193 .bLength = sizeof source_sink_config,
194 .bDescriptorType = USB_DT_CONFIG,
195
196 /* compute wTotalLength on the fly */
197 .bNumInterfaces = 1,
198 .bConfigurationValue = CONFIG_SOURCE_SINK,
199 .iConfiguration = STRING_SOURCE_SINK,
200 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
201 .bMaxPower = 1, /* self-powered */
202};
203
204static struct usb_config_descriptor loopback_config = {
205 .bLength = sizeof loopback_config,
206 .bDescriptorType = USB_DT_CONFIG,
207
208 /* compute wTotalLength on the fly */
209 .bNumInterfaces = 1,
210 .bConfigurationValue = CONFIG_LOOPBACK,
211 .iConfiguration = STRING_LOOPBACK,
212 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
213 .bMaxPower = 1, /* self-powered */
214};
215
216static struct usb_otg_descriptor otg_descriptor = { 108static struct usb_otg_descriptor otg_descriptor = {
217 .bLength = sizeof otg_descriptor, 109 .bLength = sizeof otg_descriptor,
218 .bDescriptorType = USB_DT_OTG, 110 .bDescriptorType = USB_DT_OTG,
219 111
220 .bmAttributes = USB_OTG_SRP, 112 /* REVISIT SRP-only hardware is possible, although
221}; 113 * it would not be called "OTG" ...
222 114 */
223/* one interface in each configuration */ 115 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
224
225static const struct usb_interface_descriptor source_sink_intf = {
226 .bLength = sizeof source_sink_intf,
227 .bDescriptorType = USB_DT_INTERFACE,
228
229 .bNumEndpoints = 2,
230 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
231 .iInterface = STRING_SOURCE_SINK,
232};
233
234static const struct usb_interface_descriptor loopback_intf = {
235 .bLength = sizeof loopback_intf,
236 .bDescriptorType = USB_DT_INTERFACE,
237
238 .bNumEndpoints = 2,
239 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
240 .iInterface = STRING_LOOPBACK,
241};
242
243/* two full speed bulk endpoints; their use is config-dependent */
244
245static struct usb_endpoint_descriptor fs_source_desc = {
246 .bLength = USB_DT_ENDPOINT_SIZE,
247 .bDescriptorType = USB_DT_ENDPOINT,
248
249 .bEndpointAddress = USB_DIR_IN,
250 .bmAttributes = USB_ENDPOINT_XFER_BULK,
251};
252
253static struct usb_endpoint_descriptor fs_sink_desc = {
254 .bLength = USB_DT_ENDPOINT_SIZE,
255 .bDescriptorType = USB_DT_ENDPOINT,
256
257 .bEndpointAddress = USB_DIR_OUT,
258 .bmAttributes = USB_ENDPOINT_XFER_BULK,
259};
260
261static const struct usb_descriptor_header *fs_source_sink_function[] = {
262 (struct usb_descriptor_header *) &otg_descriptor,
263 (struct usb_descriptor_header *) &source_sink_intf,
264 (struct usb_descriptor_header *) &fs_sink_desc,
265 (struct usb_descriptor_header *) &fs_source_desc,
266 NULL,
267};
268
269static const struct usb_descriptor_header *fs_loopback_function[] = {
270 (struct usb_descriptor_header *) &otg_descriptor,
271 (struct usb_descriptor_header *) &loopback_intf,
272 (struct usb_descriptor_header *) &fs_sink_desc,
273 (struct usb_descriptor_header *) &fs_source_desc,
274 NULL,
275};
276
277/*
278 * usb 2.0 devices need to expose both high speed and full speed
279 * descriptors, unless they only run at full speed.
280 *
281 * that means alternate endpoint descriptors (bigger packets)
282 * and a "device qualifier" ... plus more construction options
283 * for the config descriptor.
284 */
285
286static struct usb_endpoint_descriptor hs_source_desc = {
287 .bLength = USB_DT_ENDPOINT_SIZE,
288 .bDescriptorType = USB_DT_ENDPOINT,
289
290 .bmAttributes = USB_ENDPOINT_XFER_BULK,
291 .wMaxPacketSize = __constant_cpu_to_le16(512),
292};
293
294static struct usb_endpoint_descriptor hs_sink_desc = {
295 .bLength = USB_DT_ENDPOINT_SIZE,
296 .bDescriptorType = USB_DT_ENDPOINT,
297
298 .bmAttributes = USB_ENDPOINT_XFER_BULK,
299 .wMaxPacketSize = __constant_cpu_to_le16(512),
300};
301
302static struct usb_qualifier_descriptor dev_qualifier = {
303 .bLength = sizeof dev_qualifier,
304 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
305
306 .bcdUSB = __constant_cpu_to_le16(0x0200),
307 .bDeviceClass = USB_CLASS_VENDOR_SPEC,
308
309 .bNumConfigurations = 2,
310}; 116};
311 117
312static const struct usb_descriptor_header *hs_source_sink_function[] = { 118const struct usb_descriptor_header *otg_desc[] = {
313 (struct usb_descriptor_header *) &otg_descriptor, 119 (struct usb_descriptor_header *) &otg_descriptor,
314 (struct usb_descriptor_header *) &source_sink_intf,
315 (struct usb_descriptor_header *) &hs_source_desc,
316 (struct usb_descriptor_header *) &hs_sink_desc,
317 NULL, 120 NULL,
318}; 121};
122#endif
319 123
320static const struct usb_descriptor_header *hs_loopback_function[] = { 124/* string IDs are assigned dynamically */
321 (struct usb_descriptor_header *) &otg_descriptor,
322 (struct usb_descriptor_header *) &loopback_intf,
323 (struct usb_descriptor_header *) &hs_source_desc,
324 (struct usb_descriptor_header *) &hs_sink_desc,
325 NULL,
326};
327 125
328/* maxpacket and other transfer characteristics vary by speed. */ 126#define STRING_MANUFACTURER_IDX 0
329static inline struct usb_endpoint_descriptor * 127#define STRING_PRODUCT_IDX 1
330ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs, 128#define STRING_SERIAL_IDX 2
331 struct usb_endpoint_descriptor *fs)
332{
333 if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
334 return hs;
335 return fs;
336}
337 129
338static char manufacturer[50]; 130static char manufacturer[50];
339 131
340/* default serial number takes at least two packets */ 132/* default serial number takes at least two packets */
341static char serial[] = "0123456789.0123456789.0123456789"; 133static char serial[] = "0123456789.0123456789.0123456789";
342 134
343 135static struct usb_string strings_dev[] = {
344/* static strings, in UTF-8 */ 136 [STRING_MANUFACTURER_IDX].s = manufacturer,
345static struct usb_string strings[] = { 137 [STRING_PRODUCT_IDX].s = longname,
346 { STRING_MANUFACTURER, manufacturer, }, 138 [STRING_SERIAL_IDX].s = serial,
347 { STRING_PRODUCT, longname, },
348 { STRING_SERIAL, serial, },
349 { STRING_LOOPBACK, loopback, },
350 { STRING_SOURCE_SINK, source_sink, },
351 { } /* end of list */ 139 { } /* end of list */
352}; 140};
353 141
354static struct usb_gadget_strings stringtab = { 142static struct usb_gadget_strings stringtab_dev = {
355 .language = 0x0409, /* en-us */ 143 .language = 0x0409, /* en-us */
356 .strings = strings, 144 .strings = strings_dev,
357}; 145};
358 146
359/* 147static struct usb_gadget_strings *dev_strings[] = {
360 * config descriptors are also handcrafted. these must agree with code 148 &stringtab_dev,
361 * that sets configurations, and with code managing interfaces and their 149 NULL,
362 * altsettings. other complexity may come from: 150};
363 *
364 * - high speed support, including "other speed config" rules
365 * - multiple configurations
366 * - interfaces with alternate settings
367 * - embedded class or vendor-specific descriptors
368 *
369 * this handles high speed, and has a second config that could as easily
370 * have been an alternate interface setting (on most hardware).
371 *
372 * NOTE: to demonstrate (and test) more USB capabilities, this driver
373 * should include an altsetting to test interrupt transfers, including
374 * high bandwidth modes at high speed. (Maybe work like Intel's test
375 * device?)
376 */
377static int config_buf(struct usb_gadget *gadget,
378 u8 *buf, u8 type, unsigned index)
379{
380 int is_source_sink;
381 int len;
382 const struct usb_descriptor_header **function;
383 int hs = 0;
384
385 /* two configurations will always be index 0 and index 1 */
386 if (index > 1)
387 return -EINVAL;
388 is_source_sink = loopdefault ? (index == 1) : (index == 0);
389
390 if (gadget_is_dualspeed(gadget)) {
391 hs = (gadget->speed == USB_SPEED_HIGH);
392 if (type == USB_DT_OTHER_SPEED_CONFIG)
393 hs = !hs;
394 }
395 if (hs)
396 function = is_source_sink
397 ? hs_source_sink_function
398 : hs_loopback_function;
399 else
400 function = is_source_sink
401 ? fs_source_sink_function
402 : fs_loopback_function;
403
404 /* for now, don't advertise srp-only devices */
405 if (!gadget_is_otg(gadget))
406 function++;
407
408 len = usb_gadget_config_buf(is_source_sink
409 ? &source_sink_config
410 : &loopback_config,
411 buf, USB_BUFSIZ, function);
412 if (len < 0)
413 return len;
414 ((struct usb_config_descriptor *) buf)->bDescriptorType = type;
415 return len;
416}
417 151
418/*-------------------------------------------------------------------------*/ 152/*-------------------------------------------------------------------------*/
419 153
420static struct usb_request *alloc_ep_req(struct usb_ep *ep, unsigned length) 154struct usb_request *alloc_ep_req(struct usb_ep *ep)
421{ 155{
422 struct usb_request *req; 156 struct usb_request *req;
423 157
424 req = usb_ep_alloc_request(ep, GFP_ATOMIC); 158 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
425 if (req) { 159 if (req) {
426 req->length = length; 160 req->length = buflen;
427 req->buf = kmalloc(length, GFP_ATOMIC); 161 req->buf = kmalloc(buflen, GFP_ATOMIC);
428 if (!req->buf) { 162 if (!req->buf) {
429 usb_ep_free_request(ep, req); 163 usb_ep_free_request(ep, req);
430 req = NULL; 164 req = NULL;
@@ -433,681 +167,73 @@ static struct usb_request *alloc_ep_req(struct usb_ep *ep, unsigned length)
433 return req; 167 return req;
434} 168}
435 169
436static void free_ep_req(struct usb_ep *ep, struct usb_request *req) 170void free_ep_req(struct usb_ep *ep, struct usb_request *req)
437{ 171{
438 kfree(req->buf); 172 kfree(req->buf);
439 usb_ep_free_request(ep, req); 173 usb_ep_free_request(ep, req);
440} 174}
441 175
442/*-------------------------------------------------------------------------*/ 176static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
443
444/*
445 * SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripherals,
446 * this just sinks bulk packets OUT to the peripheral and sources them IN
447 * to the host, optionally with specific data patterns.
448 *
449 * In terms of control messaging, this supports all the standard requests
450 * plus two that support control-OUT tests.
451 *
452 * Note that because this doesn't queue more than one request at a time,
453 * some other function must be used to test queueing logic. The network
454 * link (g_ether) is probably the best option for that.
455 */
456
457/* optionally require specific source/sink data patterns */
458
459static int
460check_read_data(
461 struct zero_dev *dev,
462 struct usb_ep *ep,
463 struct usb_request *req
464)
465{ 177{
466 unsigned i; 178 int value;
467 u8 *buf = req->buf; 179
468 180 if (ep->driver_data) {
469 for (i = 0; i < req->actual; i++, buf++) { 181 value = usb_ep_disable(ep);
470 switch (pattern) { 182 if (value < 0)
471 /* all-zeroes has no synchronization issues */ 183 DBG(cdev, "disable %s --> %d\n",
472 case 0: 184 ep->name, value);
473 if (*buf == 0) 185 ep->driver_data = NULL;
474 continue;
475 break;
476 /* mod63 stays in sync with short-terminated transfers,
477 * or otherwise when host and gadget agree on how large
478 * each usb transfer request should be. resync is done
479 * with set_interface or set_config.
480 */
481 case 1:
482 if (*buf == (u8)(i % 63))
483 continue;
484 break;
485 }
486 ERROR(dev, "bad OUT byte, buf[%d] = %d\n", i, *buf);
487 usb_ep_set_halt(ep);
488 return -EINVAL;
489 } 186 }
490 return 0;
491} 187}
492 188
493static void reinit_write_data(struct usb_ep *ep, struct usb_request *req) 189void disable_endpoints(struct usb_composite_dev *cdev,
190 struct usb_ep *in, struct usb_ep *out)
494{ 191{
495 unsigned i; 192 disable_ep(cdev, in);
496 u8 *buf = req->buf; 193 disable_ep(cdev, out);
497
498 switch (pattern) {
499 case 0:
500 memset(req->buf, 0, req->length);
501 break;
502 case 1:
503 for (i = 0; i < req->length; i++)
504 *buf++ = (u8) (i % 63);
505 break;
506 }
507}
508
509/* if there is only one request in the queue, there'll always be an
510 * irq delay between end of one request and start of the next.
511 * that prevents using hardware dma queues.
512 */
513static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
514{
515 struct zero_dev *dev = ep->driver_data;
516 int status = req->status;
517
518 switch (status) {
519
520 case 0: /* normal completion? */
521 if (ep == dev->out_ep) {
522 check_read_data(dev, ep, req);
523 memset(req->buf, 0x55, req->length);
524 } else
525 reinit_write_data(ep, req);
526 break;
527
528 /* this endpoint is normally active while we're configured */
529 case -ECONNABORTED: /* hardware forced ep reset */
530 case -ECONNRESET: /* request dequeued */
531 case -ESHUTDOWN: /* disconnect from host */
532 VDBG(dev, "%s gone (%d), %d/%d\n", ep->name, status,
533 req->actual, req->length);
534 if (ep == dev->out_ep)
535 check_read_data(dev, ep, req);
536 free_ep_req(ep, req);
537 return;
538
539 case -EOVERFLOW: /* buffer overrun on read means that
540 * we didn't provide a big enough
541 * buffer.
542 */
543 default:
544#if 1
545 DBG(dev, "%s complete --> %d, %d/%d\n", ep->name,
546 status, req->actual, req->length);
547#endif
548 case -EREMOTEIO: /* short read */
549 break;
550 }
551
552 status = usb_ep_queue(ep, req, GFP_ATOMIC);
553 if (status) {
554 ERROR(dev, "kill %s: resubmit %d bytes --> %d\n",
555 ep->name, req->length, status);
556 usb_ep_set_halt(ep);
557 /* FIXME recover later ... somehow */
558 }
559}
560
561static struct usb_request *source_sink_start_ep(struct usb_ep *ep)
562{
563 struct usb_request *req;
564 int status;
565
566 req = alloc_ep_req(ep, buflen);
567 if (!req)
568 return NULL;
569
570 memset(req->buf, 0, req->length);
571 req->complete = source_sink_complete;
572
573 if (strcmp(ep->name, EP_IN_NAME) == 0)
574 reinit_write_data(ep, req);
575 else
576 memset(req->buf, 0x55, req->length);
577
578 status = usb_ep_queue(ep, req, GFP_ATOMIC);
579 if (status) {
580 struct zero_dev *dev = ep->driver_data;
581
582 ERROR(dev, "start %s --> %d\n", ep->name, status);
583 free_ep_req(ep, req);
584 req = NULL;
585 }
586
587 return req;
588}
589
590static int set_source_sink_config(struct zero_dev *dev)
591{
592 int result = 0;
593 struct usb_ep *ep;
594 struct usb_gadget *gadget = dev->gadget;
595
596 gadget_for_each_ep(ep, gadget) {
597 const struct usb_endpoint_descriptor *d;
598
599 /* one endpoint writes (sources) zeroes in (to the host) */
600 if (strcmp(ep->name, EP_IN_NAME) == 0) {
601 d = ep_desc(gadget, &hs_source_desc, &fs_source_desc);
602 result = usb_ep_enable(ep, d);
603 if (result == 0) {
604 ep->driver_data = dev;
605 if (source_sink_start_ep(ep) != NULL) {
606 dev->in_ep = ep;
607 continue;
608 }
609 usb_ep_disable(ep);
610 result = -EIO;
611 }
612
613 /* one endpoint reads (sinks) anything out (from the host) */
614 } else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
615 d = ep_desc(gadget, &hs_sink_desc, &fs_sink_desc);
616 result = usb_ep_enable(ep, d);
617 if (result == 0) {
618 ep->driver_data = dev;
619 if (source_sink_start_ep(ep) != NULL) {
620 dev->out_ep = ep;
621 continue;
622 }
623 usb_ep_disable(ep);
624 result = -EIO;
625 }
626
627 /* ignore any other endpoints */
628 } else
629 continue;
630
631 /* stop on error */
632 ERROR(dev, "can't start %s, result %d\n", ep->name, result);
633 break;
634 }
635 if (result == 0)
636 DBG(dev, "buflen %d\n", buflen);
637
638 /* caller is responsible for cleanup on error */
639 return result;
640}
641
642/*-------------------------------------------------------------------------*/
643
644static void loopback_complete(struct usb_ep *ep, struct usb_request *req)
645{
646 struct zero_dev *dev = ep->driver_data;
647 int status = req->status;
648
649 switch (status) {
650
651 case 0: /* normal completion? */
652 if (ep == dev->out_ep) {
653 /* loop this OUT packet back IN to the host */
654 req->zero = (req->actual < req->length);
655 req->length = req->actual;
656 status = usb_ep_queue(dev->in_ep, req, GFP_ATOMIC);
657 if (status == 0)
658 return;
659
660 /* "should never get here" */
661 ERROR(dev, "can't loop %s to %s: %d\n",
662 ep->name, dev->in_ep->name,
663 status);
664 }
665
666 /* queue the buffer for some later OUT packet */
667 req->length = buflen;
668 status = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
669 if (status == 0)
670 return;
671
672 /* "should never get here" */
673 /* FALLTHROUGH */
674
675 default:
676 ERROR(dev, "%s loop complete --> %d, %d/%d\n", ep->name,
677 status, req->actual, req->length);
678 /* FALLTHROUGH */
679
680 /* NOTE: since this driver doesn't maintain an explicit record
681 * of requests it submitted (just maintains qlen count), we
682 * rely on the hardware driver to clean up on disconnect or
683 * endpoint disable.
684 */
685 case -ECONNABORTED: /* hardware forced ep reset */
686 case -ECONNRESET: /* request dequeued */
687 case -ESHUTDOWN: /* disconnect from host */
688 free_ep_req(ep, req);
689 return;
690 }
691}
692
693static int set_loopback_config(struct zero_dev *dev)
694{
695 int result = 0;
696 struct usb_ep *ep;
697 struct usb_gadget *gadget = dev->gadget;
698
699 gadget_for_each_ep(ep, gadget) {
700 const struct usb_endpoint_descriptor *d;
701
702 /* one endpoint writes data back IN to the host */
703 if (strcmp(ep->name, EP_IN_NAME) == 0) {
704 d = ep_desc(gadget, &hs_source_desc, &fs_source_desc);
705 result = usb_ep_enable(ep, d);
706 if (result == 0) {
707 ep->driver_data = dev;
708 dev->in_ep = ep;
709 continue;
710 }
711
712 /* one endpoint just reads OUT packets */
713 } else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
714 d = ep_desc(gadget, &hs_sink_desc, &fs_sink_desc);
715 result = usb_ep_enable(ep, d);
716 if (result == 0) {
717 ep->driver_data = dev;
718 dev->out_ep = ep;
719 continue;
720 }
721
722 /* ignore any other endpoints */
723 } else
724 continue;
725
726 /* stop on error */
727 ERROR(dev, "can't enable %s, result %d\n", ep->name, result);
728 break;
729 }
730
731 /* allocate a bunch of read buffers and queue them all at once.
732 * we buffer at most 'qlen' transfers; fewer if any need more
733 * than 'buflen' bytes each.
734 */
735 if (result == 0) {
736 struct usb_request *req;
737 unsigned i;
738
739 ep = dev->out_ep;
740 for (i = 0; i < qlen && result == 0; i++) {
741 req = alloc_ep_req(ep, buflen);
742 if (req) {
743 req->complete = loopback_complete;
744 result = usb_ep_queue(ep, req, GFP_ATOMIC);
745 if (result)
746 DBG(dev, "%s queue req --> %d\n",
747 ep->name, result);
748 } else
749 result = -ENOMEM;
750 }
751 }
752 if (result == 0)
753 DBG(dev, "qlen %d, buflen %d\n", qlen, buflen);
754
755 /* caller is responsible for cleanup on error */
756 return result;
757}
758
759/*-------------------------------------------------------------------------*/
760
761static void zero_reset_config(struct zero_dev *dev)
762{
763 if (dev->config == 0)
764 return;
765
766 DBG(dev, "reset config\n");
767
768 /* just disable endpoints, forcing completion of pending i/o.
769 * all our completion handlers free their requests in this case.
770 */
771 if (dev->in_ep) {
772 usb_ep_disable(dev->in_ep);
773 dev->in_ep = NULL;
774 }
775 if (dev->out_ep) {
776 usb_ep_disable(dev->out_ep);
777 dev->out_ep = NULL;
778 }
779 dev->config = 0;
780 del_timer(&dev->resume);
781}
782
783/* change our operational config. this code must agree with the code
784 * that returns config descriptors, and altsetting code.
785 *
786 * it's also responsible for power management interactions. some
787 * configurations might not work with our current power sources.
788 *
789 * note that some device controller hardware will constrain what this
790 * code can do, perhaps by disallowing more than one configuration or
791 * by limiting configuration choices (like the pxa2xx).
792 */
793static int zero_set_config(struct zero_dev *dev, unsigned number)
794{
795 int result = 0;
796 struct usb_gadget *gadget = dev->gadget;
797
798 if (number == dev->config)
799 return 0;
800
801 if (gadget_is_sa1100(gadget) && dev->config) {
802 /* tx fifo is full, but we can't clear it...*/
803 ERROR(dev, "can't change configurations\n");
804 return -ESPIPE;
805 }
806 zero_reset_config(dev);
807
808 switch (number) {
809 case CONFIG_SOURCE_SINK:
810 result = set_source_sink_config(dev);
811 break;
812 case CONFIG_LOOPBACK:
813 result = set_loopback_config(dev);
814 break;
815 default:
816 result = -EINVAL;
817 /* FALL THROUGH */
818 case 0:
819 return result;
820 }
821
822 if (!result && (!dev->in_ep || !dev->out_ep))
823 result = -ENODEV;
824 if (result)
825 zero_reset_config(dev);
826 else {
827 char *speed;
828
829 switch (gadget->speed) {
830 case USB_SPEED_LOW: speed = "low"; break;
831 case USB_SPEED_FULL: speed = "full"; break;
832 case USB_SPEED_HIGH: speed = "high"; break;
833 default: speed = "?"; break;
834 }
835
836 dev->config = number;
837 INFO(dev, "%s speed config #%d: %s\n", speed, number,
838 (number == CONFIG_SOURCE_SINK)
839 ? source_sink : loopback);
840 }
841 return result;
842}
843
844/*-------------------------------------------------------------------------*/
845
846static void zero_setup_complete(struct usb_ep *ep, struct usb_request *req)
847{
848 if (req->status || req->actual != req->length)
849 DBG((struct zero_dev *) ep->driver_data,
850 "setup complete --> %d, %d/%d\n",
851 req->status, req->actual, req->length);
852}
853
854/*
855 * The setup() callback implements all the ep0 functionality that's
856 * not handled lower down, in hardware or the hardware driver (like
857 * device and endpoint feature flags, and their status). It's all
858 * housekeeping for the gadget function we're implementing. Most of
859 * the work is in config-specific setup.
860 */
861static int
862zero_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
863{
864 struct zero_dev *dev = get_gadget_data(gadget);
865 struct usb_request *req = dev->req;
866 int value = -EOPNOTSUPP;
867 u16 w_index = le16_to_cpu(ctrl->wIndex);
868 u16 w_value = le16_to_cpu(ctrl->wValue);
869 u16 w_length = le16_to_cpu(ctrl->wLength);
870
871 /* usually this stores reply data in the pre-allocated ep0 buffer,
872 * but config change events will reconfigure hardware.
873 */
874 req->zero = 0;
875 switch (ctrl->bRequest) {
876
877 case USB_REQ_GET_DESCRIPTOR:
878 if (ctrl->bRequestType != USB_DIR_IN)
879 goto unknown;
880 switch (w_value >> 8) {
881
882 case USB_DT_DEVICE:
883 value = min(w_length, (u16) sizeof device_desc);
884 memcpy(req->buf, &device_desc, value);
885 break;
886 case USB_DT_DEVICE_QUALIFIER:
887 if (!gadget_is_dualspeed(gadget))
888 break;
889 value = min(w_length, (u16) sizeof dev_qualifier);
890 memcpy(req->buf, &dev_qualifier, value);
891 break;
892
893 case USB_DT_OTHER_SPEED_CONFIG:
894 if (!gadget_is_dualspeed(gadget))
895 break;
896 // FALLTHROUGH
897 case USB_DT_CONFIG:
898 value = config_buf(gadget, req->buf,
899 w_value >> 8,
900 w_value & 0xff);
901 if (value >= 0)
902 value = min(w_length, (u16) value);
903 break;
904
905 case USB_DT_STRING:
906 /* wIndex == language code.
907 * this driver only handles one language, you can
908 * add string tables for other languages, using
909 * any UTF-8 characters
910 */
911 value = usb_gadget_get_string(&stringtab,
912 w_value & 0xff, req->buf);
913 if (value >= 0)
914 value = min(w_length, (u16) value);
915 break;
916 }
917 break;
918
919 /* currently two configs, two speeds */
920 case USB_REQ_SET_CONFIGURATION:
921 if (ctrl->bRequestType != 0)
922 goto unknown;
923 if (gadget->a_hnp_support)
924 DBG(dev, "HNP available\n");
925 else if (gadget->a_alt_hnp_support)
926 DBG(dev, "HNP needs a different root port\n");
927 else
928 VDBG(dev, "HNP inactive\n");
929 spin_lock(&dev->lock);
930 value = zero_set_config(dev, w_value);
931 spin_unlock(&dev->lock);
932 break;
933 case USB_REQ_GET_CONFIGURATION:
934 if (ctrl->bRequestType != USB_DIR_IN)
935 goto unknown;
936 *(u8 *)req->buf = dev->config;
937 value = min(w_length, (u16) 1);
938 break;
939
940 /* until we add altsetting support, or other interfaces,
941 * only 0/0 are possible. pxa2xx only supports 0/0 (poorly)
942 * and already killed pending endpoint I/O.
943 */
944 case USB_REQ_SET_INTERFACE:
945 if (ctrl->bRequestType != USB_RECIP_INTERFACE)
946 goto unknown;
947 spin_lock(&dev->lock);
948 if (dev->config && w_index == 0 && w_value == 0) {
949 u8 config = dev->config;
950
951 /* resets interface configuration, forgets about
952 * previous transaction state (queued bufs, etc)
953 * and re-inits endpoint state (toggle etc)
954 * no response queued, just zero status == success.
955 * if we had more than one interface we couldn't
956 * use this "reset the config" shortcut.
957 */
958 zero_reset_config(dev);
959 zero_set_config(dev, config);
960 value = 0;
961 }
962 spin_unlock(&dev->lock);
963 break;
964 case USB_REQ_GET_INTERFACE:
965 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
966 goto unknown;
967 if (!dev->config)
968 break;
969 if (w_index != 0) {
970 value = -EDOM;
971 break;
972 }
973 *(u8 *)req->buf = 0;
974 value = min(w_length, (u16) 1);
975 break;
976
977 /*
978 * These are the same vendor-specific requests supported by
979 * Intel's USB 2.0 compliance test devices. We exceed that
980 * device spec by allowing multiple-packet requests.
981 */
982 case 0x5b: /* control WRITE test -- fill the buffer */
983 if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
984 goto unknown;
985 if (w_value || w_index)
986 break;
987 /* just read that many bytes into the buffer */
988 if (w_length > USB_BUFSIZ)
989 break;
990 value = w_length;
991 break;
992 case 0x5c: /* control READ test -- return the buffer */
993 if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
994 goto unknown;
995 if (w_value || w_index)
996 break;
997 /* expect those bytes are still in the buffer; send back */
998 if (w_length > USB_BUFSIZ
999 || w_length != req->length)
1000 break;
1001 value = w_length;
1002 break;
1003
1004 default:
1005unknown:
1006 VDBG(dev,
1007 "unknown control req%02x.%02x v%04x i%04x l%d\n",
1008 ctrl->bRequestType, ctrl->bRequest,
1009 w_value, w_index, w_length);
1010 }
1011
1012 /* respond with data transfer before status phase? */
1013 if (value >= 0) {
1014 req->length = value;
1015 req->zero = value < w_length;
1016 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1017 if (value < 0) {
1018 DBG(dev, "ep_queue --> %d\n", value);
1019 req->status = 0;
1020 zero_setup_complete(gadget->ep0, req);
1021 }
1022 }
1023
1024 /* device either stalls (value < 0) or reports success */
1025 return value;
1026}
1027
1028static void zero_disconnect(struct usb_gadget *gadget)
1029{
1030 struct zero_dev *dev = get_gadget_data(gadget);
1031 unsigned long flags;
1032
1033 spin_lock_irqsave(&dev->lock, flags);
1034 zero_reset_config(dev);
1035
1036 /* a more significant application might have some non-usb
1037 * activities to quiesce here, saving resources like power
1038 * or pushing the notification up a network stack.
1039 */
1040 spin_unlock_irqrestore(&dev->lock, flags);
1041
1042 /* next we may get setup() calls to enumerate new connections;
1043 * or an unbind() during shutdown (including removing module).
1044 */
1045}
1046
1047static void zero_autoresume(unsigned long _dev)
1048{
1049 struct zero_dev *dev = (struct zero_dev *) _dev;
1050 int status;
1051
1052 /* normally the host would be woken up for something
1053 * more significant than just a timer firing...
1054 */
1055 if (dev->gadget->speed != USB_SPEED_UNKNOWN) {
1056 status = usb_gadget_wakeup(dev->gadget);
1057 DBG(dev, "wakeup --> %d\n", status);
1058 }
1059} 194}
1060 195
1061/*-------------------------------------------------------------------------*/ 196/*-------------------------------------------------------------------------*/
1062 197
1063static void zero_unbind(struct usb_gadget *gadget) 198static int __init zero_bind(struct usb_composite_dev *cdev)
1064{ 199{
1065 struct zero_dev *dev = get_gadget_data(gadget);
1066
1067 DBG(dev, "unbind\n");
1068
1069 /* we've already been disconnected ... no i/o is active */
1070 if (dev->req) {
1071 dev->req->length = USB_BUFSIZ;
1072 free_ep_req(gadget->ep0, dev->req);
1073 }
1074 del_timer_sync(&dev->resume);
1075 kfree(dev);
1076 set_gadget_data(gadget, NULL);
1077}
1078
1079static int __init zero_bind(struct usb_gadget *gadget)
1080{
1081 struct zero_dev *dev;
1082 struct usb_ep *ep;
1083 int gcnum; 200 int gcnum;
201 struct usb_gadget *gadget = cdev->gadget;
202 int id;
1084 203
1085 /* FIXME this can't yet work right with SH ... it has only 204 /* Allocate string descriptor numbers ... note that string
1086 * one configuration, numbered one. 205 * contents can be overridden by the composite_dev glue.
1087 */ 206 */
1088 if (gadget_is_sh(gadget)) 207 id = usb_string_id(cdev);
1089 return -ENODEV; 208 if (id < 0)
1090 209 return id;
1091 /* Bulk-only drivers like this one SHOULD be able to 210 strings_dev[STRING_MANUFACTURER_IDX].id = id;
1092 * autoconfigure on any sane usb controller driver, 211 device_desc.iManufacturer = id;
1093 * but there may also be important quirks to address. 212
213 id = usb_string_id(cdev);
214 if (id < 0)
215 return id;
216 strings_dev[STRING_PRODUCT_IDX].id = id;
217 device_desc.iProduct = id;
218
219 id = usb_string_id(cdev);
220 if (id < 0)
221 return id;
222 strings_dev[STRING_SERIAL_IDX].id = id;
223 device_desc.iSerialNumber = id;
224
225 /* Register primary, then secondary configuration. Note that
226 * SH3 only allows one config...
1094 */ 227 */
1095 usb_ep_autoconfig_reset(gadget); 228 if (loopdefault) {
1096 ep = usb_ep_autoconfig(gadget, &fs_source_desc); 229 loopback_add(cdev);
1097 if (!ep) { 230 if (!gadget_is_sh(gadget))
1098autoconf_fail: 231 sourcesink_add(cdev);
1099 pr_err("%s: can't autoconfigure on %s\n", 232 } else {
1100 shortname, gadget->name); 233 sourcesink_add(cdev);
1101 return -ENODEV; 234 if (!gadget_is_sh(gadget))
235 loopback_add(cdev);
1102 } 236 }
1103 EP_IN_NAME = ep->name;
1104 ep->driver_data = ep; /* claim */
1105
1106 ep = usb_ep_autoconfig(gadget, &fs_sink_desc);
1107 if (!ep)
1108 goto autoconf_fail;
1109 EP_OUT_NAME = ep->name;
1110 ep->driver_data = ep; /* claim */
1111 237
1112 gcnum = usb_gadget_controller_number(gadget); 238 gcnum = usb_gadget_controller_number(gadget);
1113 if (gcnum >= 0) 239 if (gcnum >= 0)
@@ -1115,144 +241,44 @@ autoconf_fail:
1115 else { 241 else {
1116 /* gadget zero is so simple (for now, no altsettings) that 242 /* gadget zero is so simple (for now, no altsettings) that
1117 * it SHOULD NOT have problems with bulk-capable hardware. 243 * it SHOULD NOT have problems with bulk-capable hardware.
1118 * so warn about unrcognized controllers, don't panic. 244 * so just warn about unrcognized controllers -- don't panic.
1119 * 245 *
1120 * things like configuration and altsetting numbering 246 * things like configuration and altsetting numbering
1121 * can need hardware-specific attention though. 247 * can need hardware-specific attention though.
1122 */ 248 */
1123 pr_warning("%s: controller '%s' not recognized\n", 249 pr_warning("%s: controller '%s' not recognized\n",
1124 shortname, gadget->name); 250 longname, gadget->name);
1125 device_desc.bcdDevice = __constant_cpu_to_le16(0x9999); 251 device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
1126 } 252 }
1127 253
1128 254
1129 /* ok, we made sense of the hardware ... */ 255 INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
1130 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1131 if (!dev)
1132 return -ENOMEM;
1133 spin_lock_init(&dev->lock);
1134 dev->gadget = gadget;
1135 set_gadget_data(gadget, dev);
1136
1137 init_timer(&dev->resume);
1138 dev->resume.function = zero_autoresume;
1139 dev->resume.data = (unsigned long) dev;
1140
1141 /* preallocate control response and buffer */
1142 dev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
1143 if (!dev->req)
1144 goto enomem;
1145 dev->req->buf = kmalloc(USB_BUFSIZ, GFP_KERNEL);
1146 if (!dev->req->buf)
1147 goto enomem;
1148
1149 dev->req->complete = zero_setup_complete;
1150
1151 device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1152
1153 if (gadget_is_dualspeed(gadget)) {
1154 /* assume ep0 uses the same value for both speeds ... */
1155 dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
1156
1157 /* and that all endpoints are dual-speed */
1158 hs_source_desc.bEndpointAddress =
1159 fs_source_desc.bEndpointAddress;
1160 hs_sink_desc.bEndpointAddress =
1161 fs_sink_desc.bEndpointAddress;
1162 }
1163
1164 if (gadget_is_otg(gadget)) {
1165 otg_descriptor.bmAttributes |= USB_OTG_HNP,
1166 source_sink_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1167 loopback_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1168 }
1169
1170 usb_gadget_set_selfpowered(gadget);
1171
1172 if (autoresume) {
1173 source_sink_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1174 loopback_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1175 }
1176
1177 gadget->ep0->driver_data = dev;
1178
1179 INFO(dev, "%s, version: " DRIVER_VERSION "\n", longname);
1180 INFO(dev, "using %s, OUT %s IN %s\n", gadget->name,
1181 EP_OUT_NAME, EP_IN_NAME);
1182 256
1183 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s", 257 snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
1184 init_utsname()->sysname, init_utsname()->release, 258 init_utsname()->sysname, init_utsname()->release,
1185 gadget->name); 259 gadget->name);
1186 260
1187 return 0; 261 return 0;
1188
1189enomem:
1190 zero_unbind(gadget);
1191 return -ENOMEM;
1192} 262}
1193 263
1194/*-------------------------------------------------------------------------*/ 264static struct usb_composite_driver zero_driver = {
1195 265 .name = "zero",
1196static void zero_suspend(struct usb_gadget *gadget) 266 .dev = &device_desc,
1197{ 267 .strings = dev_strings,
1198 struct zero_dev *dev = get_gadget_data(gadget);
1199
1200 if (gadget->speed == USB_SPEED_UNKNOWN)
1201 return;
1202
1203 if (autoresume) {
1204 mod_timer(&dev->resume, jiffies + (HZ * autoresume));
1205 DBG(dev, "suspend, wakeup in %d seconds\n", autoresume);
1206 } else
1207 DBG(dev, "suspend\n");
1208}
1209
1210static void zero_resume(struct usb_gadget *gadget)
1211{
1212 struct zero_dev *dev = get_gadget_data(gadget);
1213
1214 DBG(dev, "resume\n");
1215 del_timer(&dev->resume);
1216}
1217
1218
1219/*-------------------------------------------------------------------------*/
1220
1221static struct usb_gadget_driver zero_driver = {
1222#ifdef CONFIG_USB_GADGET_DUALSPEED
1223 .speed = USB_SPEED_HIGH,
1224#else
1225 .speed = USB_SPEED_FULL,
1226#endif
1227 .function = (char *) longname,
1228 .bind = zero_bind, 268 .bind = zero_bind,
1229 .unbind = __exit_p(zero_unbind),
1230
1231 .setup = zero_setup,
1232 .disconnect = zero_disconnect,
1233
1234 .suspend = zero_suspend,
1235 .resume = zero_resume,
1236
1237 .driver = {
1238 .name = (char *) shortname,
1239 .owner = THIS_MODULE,
1240 },
1241}; 269};
1242 270
1243MODULE_AUTHOR("David Brownell"); 271MODULE_AUTHOR("David Brownell");
1244MODULE_LICENSE("GPL"); 272MODULE_LICENSE("GPL");
1245 273
1246
1247static int __init init(void) 274static int __init init(void)
1248{ 275{
1249 return usb_gadget_register_driver(&zero_driver); 276 return usb_composite_register(&zero_driver);
1250} 277}
1251module_init(init); 278module_init(init);
1252 279
1253static void __exit cleanup(void) 280static void __exit cleanup(void)
1254{ 281{
1255 usb_gadget_unregister_driver(&zero_driver); 282 usb_composite_unregister(&zero_driver);
1256} 283}
1257module_exit(cleanup); 284module_exit(cleanup);
1258
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-09 20:09:30 -0500