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   1 /*
   2  * f_sourcesink.c - USB peripheral source/sink configuration driver
   3  *
   4  * Copyright (C) 2003-2008 David Brownell
   5  * Copyright (C) 2008 by Nokia Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /* #define VERBOSE_DEBUG */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/utsname.h>
  26 #include <linux/device.h>
  27
  28 #include "g_zero.h"
  29 #include "gadget_chips.h"
  30
  31
  32 /*
  33  * SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripheral
  34  * controller drivers.
  35  *
  36  * This just sinks bulk packets OUT to the peripheral and sources them IN
  37  * to the host, optionally with specific data patterns for integrity tests.
  38  * As such it supports basic functionality and load tests.
  39  *
  40  * In terms of control messaging, this supports all the standard requests
  41  * plus two that support control-OUT tests.  If the optional "autoresume"
  42  * mode is enabled, it provides good functional coverage for the "USBCV"
  43  * test harness from USB-IF.
  44  *
  45  * Note that because this doesn't queue more than one request at a time,
  46  * some other function must be used to test queueing logic.  The network
  47  * link (g_ether) is the best overall option for that, since its TX and RX
  48  * queues are relatively independent, will receive a range of packet sizes,
  49  * and can often be made to run out completely.  Those issues are important
  50  * when stress testing peripheral controller drivers.
  51  *
  52  *
  53  * This is currently packaged as a configuration driver, which can't be
  54  * combined with other functions to make composite devices.  However, it
  55  * can be combined with other independent configurations.
  56  */
  57 struct f_sourcesink {
  58         struct usb_function     function;
  59
  60         struct usb_ep           *in_ep;
  61         struct usb_ep           *out_ep;
  62         struct timer_list       resume;
  63 };
  64
  65 static inline struct f_sourcesink *func_to_ss(struct usb_function *f)
  66 {
  67         return container_of(f, struct f_sourcesink, function);
  68 }
  69
  70 static unsigned autoresume;
  71 module_param(autoresume, uint, 0);
  72 MODULE_PARM_DESC(autoresume, "zero, or seconds before remote wakeup");
  73
  74 static unsigned pattern;
  75 module_param(pattern, uint, 0);
  76 MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63 ");
  77
  78 /*-------------------------------------------------------------------------*/
  79
  80 static struct usb_interface_descriptor source_sink_intf = {
  81         .bLength =              sizeof source_sink_intf,
  82         .bDescriptorType =      USB_DT_INTERFACE,
  83
  84         .bNumEndpoints =        2,
  85         .bInterfaceClass =      USB_CLASS_VENDOR_SPEC,
  86         /* .iInterface = DYNAMIC */
  87 };
  88
  89 /* full speed support: */
  90
  91 static struct usb_endpoint_descriptor fs_source_desc = {
  92         .bLength =              USB_DT_ENDPOINT_SIZE,
  93         .bDescriptorType =      USB_DT_ENDPOINT,
  94
  95         .bEndpointAddress =     USB_DIR_IN,
  96         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
  97 };
  98
  99 static struct usb_endpoint_descriptor fs_sink_desc = {
 100         .bLength =              USB_DT_ENDPOINT_SIZE,
 101         .bDescriptorType =      USB_DT_ENDPOINT,
 102
 103         .bEndpointAddress =     USB_DIR_OUT,
 104         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 105 };
 106
 107 static struct usb_descriptor_header *fs_source_sink_descs[] = {
 108         (struct usb_descriptor_header *) &source_sink_intf,
 109         (struct usb_descriptor_header *) &fs_sink_desc,
 110         (struct usb_descriptor_header *) &fs_source_desc,
 111         NULL,
 112 };
 113
 114 /* high speed support: */
 115
 116 static struct usb_endpoint_descriptor hs_source_desc = {
 117         .bLength =              USB_DT_ENDPOINT_SIZE,
 118         .bDescriptorType =      USB_DT_ENDPOINT,
 119
 120         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 121         .wMaxPacketSize =       __constant_cpu_to_le16(512),
 122 };
 123
 124 static struct usb_endpoint_descriptor hs_sink_desc = {
 125         .bLength =              USB_DT_ENDPOINT_SIZE,
 126         .bDescriptorType =      USB_DT_ENDPOINT,
 127
 128         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 129         .wMaxPacketSize =       __constant_cpu_to_le16(512),
 130 };
 131
 132 static struct usb_descriptor_header *hs_source_sink_descs[] = {
 133         (struct usb_descriptor_header *) &source_sink_intf,
 134         (struct usb_descriptor_header *) &hs_source_desc,
 135         (struct usb_descriptor_header *) &hs_sink_desc,
 136         NULL,
 137 };
 138
 139 /* function-specific strings: */
 140
 141 static struct usb_string strings_sourcesink[] = {
 142         [0].s = "source and sink data",
 143         {  }                    /* end of list */
 144 };
 145
 146 static struct usb_gadget_strings stringtab_sourcesink = {
 147         .language       = 0x0409,       /* en-us */
 148         .strings        = strings_sourcesink,
 149 };
 150
 151 static struct usb_gadget_strings *sourcesink_strings[] = {
 152         &stringtab_sourcesink,
 153         NULL,
 154 };
 155
 156 /*-------------------------------------------------------------------------*/
 157
 158 static void sourcesink_autoresume(unsigned long _c)
 159 {
 160         struct usb_composite_dev *cdev = (void *)_c;
 161         struct usb_gadget       *g = cdev->gadget;
 162
 163         /* Normally the host would be woken up for something
 164          * more significant than just a timer firing; likely
 165          * because of some direct user request.
 166          */
 167         if (g->speed != USB_SPEED_UNKNOWN) {
 168                 int status = usb_gadget_wakeup(g);
 169                 DBG(cdev, "%s --> %d\n", __func__, status);
 170         }
 171 }
 172
 173 static int __init
 174 sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
 175 {
 176         struct usb_composite_dev *cdev = c->cdev;
 177         struct f_sourcesink     *ss = func_to_ss(f);
 178         int     id;
 179
 180         /* allocate interface ID(s) */
 181         id = usb_interface_id(c, f);
 182         if (id < 0)
 183                 return id;
 184         source_sink_intf.bInterfaceNumber = id;
 185
 186         /* allocate endpoints */
 187         ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
 188         if (!ss->in_ep) {
 189 autoconf_fail:
 190                 ERROR(cdev, "%s: can't autoconfigure on %s\n",
 191                         f->name, cdev->gadget->name);
 192                 return -ENODEV;
 193         }
 194         ss->in_ep->driver_data = cdev;  /* claim */
 195
 196         ss->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
 197         if (!ss->out_ep)
 198                 goto autoconf_fail;
 199         ss->out_ep->driver_data = cdev; /* claim */
 200
 201         setup_timer(&ss->resume, sourcesink_autoresume,
 202                         (unsigned long) c->cdev);
 203
 204         /* support high speed hardware */
 205         if (gadget_is_dualspeed(c->cdev->gadget)) {
 206                 hs_source_desc.bEndpointAddress =
 207                                 fs_source_desc.bEndpointAddress;
 208                 hs_sink_desc.bEndpointAddress =
 209                                 fs_sink_desc.bEndpointAddress;
 210                 f->hs_descriptors = hs_source_sink_descs;
 211         }
 212
 213         DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
 214                         gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
 215                         f->name, ss->in_ep->name, ss->out_ep->name);
 216         return 0;
 217 }
 218
 219 static void
 220 sourcesink_unbind(struct usb_configuration *c, struct usb_function *f)
 221 {
 222         kfree(func_to_ss(f));
 223 }
 224
 225 /* optionally require specific source/sink data patterns  */
 226 static int check_read_data(struct f_sourcesink *ss, struct usb_request *req)
 227 {
 228         unsigned                i;
 229         u8                      *buf = req->buf;
 230         struct usb_composite_dev *cdev = ss->function.config->cdev;
 231
 232         for (i = 0; i < req->actual; i++, buf++) {
 233                 switch (pattern) {
 234
 235                 /* all-zeroes has no synchronization issues */
 236                 case 0:
 237                         if (*buf == 0)
 238                                 continue;
 239                         break;
 240
 241                 /* "mod63" stays in sync with short-terminated transfers,
 242                  * OR otherwise when host and gadget agree on how large
 243                  * each usb transfer request should be.  Resync is done
 244                  * with set_interface or set_config.  (We *WANT* it to
 245                  * get quickly out of sync if controllers or their drivers
 246                  * stutter for any reason, including buffer duplcation...)
 247                  */
 248                 case 1:
 249                         if (*buf == (u8)(i % 63))
 250                                 continue;
 251                         break;
 252                 }
 253                 ERROR(cdev, "bad OUT byte, buf[%d] = %d\n", i, *buf);
 254                 usb_ep_set_halt(ss->out_ep);
 255                 return -EINVAL;
 256         }
 257         return 0;
 258 }
 259
 260 static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
 261 {
 262         unsigned        i;
 263         u8              *buf = req->buf;
 264
 265         switch (pattern) {
 266         case 0:
 267                 memset(req->buf, 0, req->length);
 268                 break;
 269         case 1:
 270                 for  (i = 0; i < req->length; i++)
 271                         *buf++ = (u8) (i % 63);
 272                 break;
 273         }
 274 }
 275
 276 static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
 277 {
 278         struct f_sourcesink     *ss = ep->driver_data;
 279         struct usb_composite_dev *cdev = ss->function.config->cdev;
 280         int                     status = req->status;
 281
 282         switch (status) {
 283
 284         case 0:                         /* normal completion? */
 285                 if (ep == ss->out_ep) {
 286                         check_read_data(ss, req);
 287                         memset(req->buf, 0x55, req->length);
 288                 } else
 289                         reinit_write_data(ep, req);
 290                 break;
 291
 292         /* this endpoint is normally active while we're configured */
 293         case -ECONNABORTED:             /* hardware forced ep reset */
 294         case -ECONNRESET:               /* request dequeued */
 295         case -ESHUTDOWN:                /* disconnect from host */
 296                 VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
 297                                 req->actual, req->length);
 298                 if (ep == ss->out_ep)
 299                         check_read_data(ss, req);
 300                 free_ep_req(ep, req);
 301                 return;
 302
 303         case -EOVERFLOW:                /* buffer overrun on read means that
 304                                          * we didn't provide a big enough
 305                                          * buffer.
 306                                          */
 307         default:
 308 #if 1
 309                 DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
 310                                 status, req->actual, req->length);
 311 #endif
 312         case -EREMOTEIO:                /* short read */
 313                 break;
 314         }
 315
 316         status = usb_ep_queue(ep, req, GFP_ATOMIC);
 317         if (status) {
 318                 ERROR(cdev, "kill %s:  resubmit %d bytes --> %d\n",
 319                                 ep->name, req->length, status);
 320                 usb_ep_set_halt(ep);
 321                 /* FIXME recover later ... somehow */
 322         }
 323 }
 324
 325 static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in)
 326 {
 327         struct usb_ep           *ep;
 328         struct usb_request      *req;
 329         int                     status;
 330
 331         ep = is_in ? ss->in_ep : ss->out_ep;
 332         req = alloc_ep_req(ep);
 333         if (!req)
 334                 return -ENOMEM;
 335
 336         req->complete = source_sink_complete;
 337         if (is_in)
 338                 reinit_write_data(ep, req);
 339         else
 340                 memset(req->buf, 0x55, req->length);
 341
 342         status = usb_ep_queue(ep, req, GFP_ATOMIC);
 343         if (status) {
 344                 struct usb_composite_dev        *cdev;
 345
 346                 cdev = ss->function.config->cdev;
 347                 ERROR(cdev, "start %s %s --> %d\n",
 348                                 is_in ? "IN" : "OUT",
 349                                 ep->name, status);
 350                 free_ep_req(ep, req);
 351         }
 352
 353         return status;
 354 }
 355
 356 static void disable_source_sink(struct f_sourcesink *ss)
 357 {
 358         struct usb_composite_dev        *cdev;
 359
 360         cdev = ss->function.config->cdev;
 361         disable_endpoints(cdev, ss->in_ep, ss->out_ep);
 362         del_timer(&ss->resume);
 363         VDBG(cdev, "%s disabled\n", ss->function.name);
 364 }
 365
 366 static int
 367 enable_source_sink(struct usb_composite_dev *cdev, struct f_sourcesink *ss)
 368 {
 369         int                                     result = 0;
 370         const struct usb_endpoint_descriptor    *src, *sink;
 371         struct usb_ep                           *ep;
 372
 373         src = ep_choose(cdev->gadget, &hs_source_desc, &fs_source_desc);
 374         sink = ep_choose(cdev->gadget, &hs_sink_desc, &fs_sink_desc);
 375
 376         /* one endpoint writes (sources) zeroes IN (to the host) */
 377         ep = ss->in_ep;
 378         result = usb_ep_enable(ep, src);
 379         if (result < 0)
 380                 return result;
 381         ep->driver_data = ss;
 382
 383         result = source_sink_start_ep(ss, true);
 384         if (result < 0) {
 385 fail:
 386                 ep = ss->in_ep;
 387                 usb_ep_disable(ep);
 388                 ep->driver_data = NULL;
 389                 return result;
 390         }
 391
 392         /* one endpoint reads (sinks) anything OUT (from the host) */
 393         ep = ss->out_ep;
 394         result = usb_ep_enable(ep, sink);
 395         if (result < 0)
 396                 goto fail;
 397         ep->driver_data = ss;
 398
 399         result = source_sink_start_ep(ss, false);
 400         if (result < 0) {
 401                 usb_ep_disable(ep);
 402                 ep->driver_data = NULL;
 403                 goto fail;
 404         }
 405
 406         DBG(cdev, "%s enabled\n", ss->function.name);
 407         return result;
 408 }
 409
 410 static int sourcesink_set_alt(struct usb_function *f,
 411                 unsigned intf, unsigned alt)
 412 {
 413         struct f_sourcesink     *ss = func_to_ss(f);
 414         struct usb_composite_dev *cdev = f->config->cdev;
 415
 416         /* we know alt is zero */
 417         if (ss->in_ep->driver_data)
 418                 disable_source_sink(ss);
 419         return enable_source_sink(cdev, ss);
 420 }
 421
 422 static void sourcesink_disable(struct usb_function *f)
 423 {
 424         struct f_sourcesink     *ss = func_to_ss(f);
 425
 426         disable_source_sink(ss);
 427 }
 428
 429 static void sourcesink_suspend(struct usb_function *f)
 430 {
 431         struct f_sourcesink     *ss = func_to_ss(f);
 432         struct usb_composite_dev *cdev = f->config->cdev;
 433
 434         if (cdev->gadget->speed == USB_SPEED_UNKNOWN)
 435                 return;
 436
 437         if (autoresume) {
 438                 mod_timer(&ss->resume, jiffies + (HZ * autoresume));
 439                 DBG(cdev, "suspend, wakeup in %d seconds\n", autoresume);
 440         } else
 441                 DBG(cdev, "%s\n", __func__);
 442 }
 443
 444 static void sourcesink_resume(struct usb_function *f)
 445 {
 446         struct f_sourcesink     *ss = func_to_ss(f);
 447         struct usb_composite_dev *cdev = f->config->cdev;
 448
 449         DBG(cdev, "%s\n", __func__);
 450         del_timer(&ss->resume);
 451 }
 452
 453 /*-------------------------------------------------------------------------*/
 454
 455 static int __init sourcesink_bind_config(struct usb_configuration *c)
 456 {
 457         struct f_sourcesink     *ss;
 458         int                     status;
 459
 460         ss = kzalloc(sizeof *ss, GFP_KERNEL);
 461         if (!ss)
 462                 return -ENOMEM;
 463
 464         ss->function.name = "source/sink";
 465         ss->function.descriptors = fs_source_sink_descs;
 466         ss->function.bind = sourcesink_bind;
 467         ss->function.unbind = sourcesink_unbind;
 468         ss->function.set_alt = sourcesink_set_alt;
 469         ss->function.disable = sourcesink_disable;
 470         ss->function.suspend = sourcesink_suspend;
 471         ss->function.resume = sourcesink_resume;
 472
 473         status = usb_add_function(c, &ss->function);
 474         if (status)
 475                 kfree(ss);
 476         return status;
 477 }
 478
 479 static int sourcesink_setup(struct usb_configuration *c,
 480                 const struct usb_ctrlrequest *ctrl)
 481 {
 482         struct usb_request      *req = c->cdev->req;
 483         int                     value = -EOPNOTSUPP;
 484         u16                     w_index = le16_to_cpu(ctrl->wIndex);
 485         u16                     w_value = le16_to_cpu(ctrl->wValue);
 486         u16                     w_length = le16_to_cpu(ctrl->wLength);
 487
 488         /* composite driver infrastructure handles everything except
 489          * the two control test requests.
 490          */
 491         switch (ctrl->bRequest) {
 492
 493         /*
 494          * These are the same vendor-specific requests supported by
 495          * Intel's USB 2.0 compliance test devices.  We exceed that
 496          * device spec by allowing multiple-packet requests.
 497          *
 498          * NOTE:  the Control-OUT data stays in req->buf ... better
 499          * would be copying it into a scratch buffer, so that other
 500          * requests may safely intervene.
 501          */
 502         case 0x5b:      /* control WRITE test -- fill the buffer */
 503                 if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
 504                         goto unknown;
 505                 if (w_value || w_index)
 506                         break;
 507                 /* just read that many bytes into the buffer */
 508                 if (w_length > req->length)
 509                         break;
 510                 value = w_length;
 511                 break;
 512         case 0x5c:      /* control READ test -- return the buffer */
 513                 if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
 514                         goto unknown;
 515                 if (w_value || w_index)
 516                         break;
 517                 /* expect those bytes are still in the buffer; send back */
 518                 if (w_length > req->length)
 519                         break;
 520                 value = w_length;
 521                 break;
 522
 523         default:
 524 unknown:
 525                 VDBG(c->cdev,
 526                         "unknown control req%02x.%02x v%04x i%04x l%d\n",
 527                         ctrl->bRequestType, ctrl->bRequest,
 528                         w_value, w_index, w_length);
 529         }
 530
 531         /* respond with data transfer or status phase? */
 532         if (value >= 0) {
 533                 VDBG(c->cdev, "source/sink req%02x.%02x v%04x i%04x l%d\n",
 534                         ctrl->bRequestType, ctrl->bRequest,
 535                         w_value, w_index, w_length);
 536                 req->zero = 0;
 537                 req->length = value;
 538                 value = usb_ep_queue(c->cdev->gadget->ep0, req, GFP_ATOMIC);
 539                 if (value < 0)
 540                         ERROR(c->cdev, "source/sinkc response, err %d\n",
 541                                         value);
 542         }
 543
 544         /* device either stalls (value < 0) or reports success */
 545         return value;
 546 }
 547
 548 static struct usb_configuration sourcesink_driver = {
 549         .label          = "source/sink",
 550         .strings        = sourcesink_strings,
 551         .bind           = sourcesink_bind_config,
 552         .setup          = sourcesink_setup,
 553         .bConfigurationValue = 3,
 554         .bmAttributes   = USB_CONFIG_ATT_SELFPOWER,
 555         .bMaxPower      = 1,    /* 2 mA, minimal */
 556         /* .iConfiguration = DYNAMIC */
 557 };
 558
 559 /**
 560  * sourcesink_add - add a source/sink testing configuration to a device
 561  * @cdev: the device to support the configuration
 562  */
 563 int __init sourcesink_add(struct usb_composite_dev *cdev)
 564 {
 565         int id;
 566
 567         /* allocate string ID(s) */
 568         id = usb_string_id(cdev);
 569         if (id < 0)
 570                 return id;
 571         strings_sourcesink[0].id = id;
 572
 573         source_sink_intf.iInterface = id;
 574         sourcesink_driver.iConfiguration = id;
 575
 576         /* support autoresume for remote wakeup testing */
 577         if (autoresume)
 578                 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 579
 580         /* support OTG systems */
 581         if (gadget_is_otg(cdev->gadget)) {
 582                 sourcesink_driver.descriptors = otg_desc;
 583                 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 584         }
 585
 586         return usb_add_config(cdev, &sourcesink_driver);
 587 }