drivers/usb/gadget/tcm_usb_gadget.c

   1 /* Target based USB-Gadget
   2  *
   3  * UAS protocol handling, target callbacks, configfs handling,
   4  * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
   5  *
   6  * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
   7  * License: GPLv2 as published by FSF.
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/string.h>
  13 #include <linux/configfs.h>
  14 #include <linux/ctype.h>
  15 #include <linux/usb/ch9.h>
  16 #include <linux/usb/composite.h>
  17 #include <linux/usb/gadget.h>
  18 #include <linux/usb/storage.h>
  19 #include <scsi/scsi.h>
  20 #include <scsi/scsi_tcq.h>
  21 #include <target/target_core_base.h>
  22 #include <target/target_core_fabric.h>
  23 #include <target/target_core_fabric_configfs.h>
  24 #include <target/target_core_configfs.h>
  25 #include <target/configfs_macros.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "tcm_usb_gadget.h"
  29
  30 USB_GADGET_COMPOSITE_OPTIONS();
  31
  32 static struct target_fabric_configfs *usbg_fabric_configfs;
  33
  34 static inline struct f_uas *to_f_uas(struct usb_function *f)
  35 {
  36         return container_of(f, struct f_uas, function);
  37 }
  38
  39 static void usbg_cmd_release(struct kref *);
  40
  41 static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
  42 {
  43         kref_put(&cmd->ref, usbg_cmd_release);
  44 }
  45
  46 /* Start bot.c code */
  47
  48 static int bot_enqueue_cmd_cbw(struct f_uas *fu)
  49 {
  50         int ret;
  51
  52         if (fu->flags & USBG_BOT_CMD_PEND)
  53                 return 0;
  54
  55         ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
  56         if (!ret)
  57                 fu->flags |= USBG_BOT_CMD_PEND;
  58         return ret;
  59 }
  60
  61 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
  62 {
  63         struct usbg_cmd *cmd = req->context;
  64         struct f_uas *fu = cmd->fu;
  65
  66         usbg_cleanup_cmd(cmd);
  67         if (req->status < 0) {
  68                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
  69                 return;
  70         }
  71
  72         /* CSW completed, wait for next CBW */
  73         bot_enqueue_cmd_cbw(fu);
  74 }
  75
  76 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
  77 {
  78         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
  79         int ret;
  80         u8 *sense;
  81         unsigned int csw_stat;
  82
  83         csw_stat = cmd->csw_code;
  84
  85         /*
  86          * We can't send SENSE as a response. So we take ASC & ASCQ from our
  87          * sense buffer and queue it and hope the host sends a REQUEST_SENSE
  88          * command where it learns why we failed.
  89          */
  90         sense = cmd->sense_iu.sense;
  91
  92         csw->Tag = cmd->bot_tag;
  93         csw->Status = csw_stat;
  94         fu->bot_status.req->context = cmd;
  95         ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
  96         if (ret)
  97                 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
  98 }
  99
 100 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
 101 {
 102         struct usbg_cmd *cmd = req->context;
 103         struct f_uas *fu = cmd->fu;
 104
 105         if (req->status < 0)
 106                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
 107
 108         if (cmd->data_len) {
 109                 if (cmd->data_len > ep->maxpacket) {
 110                         req->length = ep->maxpacket;
 111                         cmd->data_len -= ep->maxpacket;
 112                 } else {
 113                         req->length = cmd->data_len;
 114                         cmd->data_len = 0;
 115                 }
 116
 117                 usb_ep_queue(ep, req, GFP_ATOMIC);
 118                 return ;
 119         }
 120         bot_enqueue_sense_code(fu, cmd);
 121 }
 122
 123 static void bot_send_bad_status(struct usbg_cmd *cmd)
 124 {
 125         struct f_uas *fu = cmd->fu;
 126         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
 127         struct usb_request *req;
 128         struct usb_ep *ep;
 129
 130         csw->Residue = cpu_to_le32(cmd->data_len);
 131
 132         if (cmd->data_len) {
 133                 if (cmd->is_read) {
 134                         ep = fu->ep_in;
 135                         req = fu->bot_req_in;
 136                 } else {
 137                         ep = fu->ep_out;
 138                         req = fu->bot_req_out;
 139                 }
 140
 141                 if (cmd->data_len > fu->ep_in->maxpacket) {
 142                         req->length = ep->maxpacket;
 143                         cmd->data_len -= ep->maxpacket;
 144                 } else {
 145                         req->length = cmd->data_len;
 146                         cmd->data_len = 0;
 147                 }
 148                 req->complete = bot_err_compl;
 149                 req->context = cmd;
 150                 req->buf = fu->cmd.buf;
 151                 usb_ep_queue(ep, req, GFP_KERNEL);
 152         } else {
 153                 bot_enqueue_sense_code(fu, cmd);
 154         }
 155 }
 156
 157 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
 158 {
 159         struct f_uas *fu = cmd->fu;
 160         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
 161         int ret;
 162
 163         if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
 164                 if (!moved_data && cmd->data_len) {
 165                         /*
 166                          * the host wants to move data, we don't. Fill / empty
 167                          * the pipe and then send the csw with reside set.
 168                          */
 169                         cmd->csw_code = US_BULK_STAT_OK;
 170                         bot_send_bad_status(cmd);
 171                         return 0;
 172                 }
 173
 174                 csw->Tag = cmd->bot_tag;
 175                 csw->Residue = cpu_to_le32(0);
 176                 csw->Status = US_BULK_STAT_OK;
 177                 fu->bot_status.req->context = cmd;
 178
 179                 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
 180                 if (ret)
 181                         pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
 182         } else {
 183                 cmd->csw_code = US_BULK_STAT_FAIL;
 184                 bot_send_bad_status(cmd);
 185         }
 186         return 0;
 187 }
 188
 189 /*
 190  * Called after command (no data transfer) or after the write (to device)
 191  * operation is completed
 192  */
 193 static int bot_send_status_response(struct usbg_cmd *cmd)
 194 {
 195         bool moved_data = false;
 196
 197         if (!cmd->is_read)
 198                 moved_data = true;
 199         return bot_send_status(cmd, moved_data);
 200 }
 201
 202 /* Read request completed, now we have to send the CSW */
 203 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
 204 {
 205         struct usbg_cmd *cmd = req->context;
 206
 207         if (req->status < 0)
 208                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
 209
 210         bot_send_status(cmd, true);
 211 }
 212
 213 static int bot_send_read_response(struct usbg_cmd *cmd)
 214 {
 215         struct f_uas *fu = cmd->fu;
 216         struct se_cmd *se_cmd = &cmd->se_cmd;
 217         struct usb_gadget *gadget = fuas_to_gadget(fu);
 218         int ret;
 219
 220         if (!cmd->data_len) {
 221                 cmd->csw_code = US_BULK_STAT_PHASE;
 222                 bot_send_bad_status(cmd);
 223                 return 0;
 224         }
 225
 226         if (!gadget->sg_supported) {
 227                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 228                 if (!cmd->data_buf)
 229                         return -ENOMEM;
 230
 231                 sg_copy_to_buffer(se_cmd->t_data_sg,
 232                                 se_cmd->t_data_nents,
 233                                 cmd->data_buf,
 234                                 se_cmd->data_length);
 235
 236                 fu->bot_req_in->buf = cmd->data_buf;
 237         } else {
 238                 fu->bot_req_in->buf = NULL;
 239                 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
 240                 fu->bot_req_in->sg = se_cmd->t_data_sg;
 241         }
 242
 243         fu->bot_req_in->complete = bot_read_compl;
 244         fu->bot_req_in->length = se_cmd->data_length;
 245         fu->bot_req_in->context = cmd;
 246         ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
 247         if (ret)
 248                 pr_err("%s(%d)\n", __func__, __LINE__);
 249         return 0;
 250 }
 251
 252 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
 253 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
 254
 255 static int bot_send_write_request(struct usbg_cmd *cmd)
 256 {
 257         struct f_uas *fu = cmd->fu;
 258         struct se_cmd *se_cmd = &cmd->se_cmd;
 259         struct usb_gadget *gadget = fuas_to_gadget(fu);
 260         int ret;
 261
 262         init_completion(&cmd->write_complete);
 263         cmd->fu = fu;
 264
 265         if (!cmd->data_len) {
 266                 cmd->csw_code = US_BULK_STAT_PHASE;
 267                 return -EINVAL;
 268         }
 269
 270         if (!gadget->sg_supported) {
 271                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
 272                 if (!cmd->data_buf)
 273                         return -ENOMEM;
 274
 275                 fu->bot_req_out->buf = cmd->data_buf;
 276         } else {
 277                 fu->bot_req_out->buf = NULL;
 278                 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
 279                 fu->bot_req_out->sg = se_cmd->t_data_sg;
 280         }
 281
 282         fu->bot_req_out->complete = usbg_data_write_cmpl;
 283         fu->bot_req_out->length = se_cmd->data_length;
 284         fu->bot_req_out->context = cmd;
 285
 286         ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
 287         if (ret)
 288                 goto cleanup;
 289         ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
 290         if (ret)
 291                 pr_err("%s(%d)\n", __func__, __LINE__);
 292
 293         wait_for_completion(&cmd->write_complete);
 294         target_execute_cmd(se_cmd);
 295 cleanup:
 296         return ret;
 297 }
 298
 299 static int bot_submit_command(struct f_uas *, void *, unsigned int);
 300
 301 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
 302 {
 303         struct f_uas *fu = req->context;
 304         int ret;
 305
 306         fu->flags &= ~USBG_BOT_CMD_PEND;
 307
 308         if (req->status < 0)
 309                 return;
 310
 311         ret = bot_submit_command(fu, req->buf, req->actual);
 312         if (ret)
 313                 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
 314 }
 315
 316 static int bot_prepare_reqs(struct f_uas *fu)
 317 {
 318         int ret;
 319
 320         fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 321         if (!fu->bot_req_in)
 322                 goto err;
 323
 324         fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 325         if (!fu->bot_req_out)
 326                 goto err_out;
 327
 328         fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 329         if (!fu->cmd.req)
 330                 goto err_cmd;
 331
 332         fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 333         if (!fu->bot_status.req)
 334                 goto err_sts;
 335
 336         fu->bot_status.req->buf = &fu->bot_status.csw;
 337         fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
 338         fu->bot_status.req->complete = bot_status_complete;
 339         fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
 340
 341         fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
 342         if (!fu->cmd.buf)
 343                 goto err_buf;
 344
 345         fu->cmd.req->complete = bot_cmd_complete;
 346         fu->cmd.req->buf = fu->cmd.buf;
 347         fu->cmd.req->length = fu->ep_out->maxpacket;
 348         fu->cmd.req->context = fu;
 349
 350         ret = bot_enqueue_cmd_cbw(fu);
 351         if (ret)
 352                 goto err_queue;
 353         return 0;
 354 err_queue:
 355         kfree(fu->cmd.buf);
 356         fu->cmd.buf = NULL;
 357 err_buf:
 358         usb_ep_free_request(fu->ep_in, fu->bot_status.req);
 359 err_sts:
 360         usb_ep_free_request(fu->ep_out, fu->cmd.req);
 361         fu->cmd.req = NULL;
 362 err_cmd:
 363         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
 364         fu->bot_req_out = NULL;
 365 err_out:
 366         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
 367         fu->bot_req_in = NULL;
 368 err:
 369         pr_err("BOT: endpoint setup failed\n");
 370         return -ENOMEM;
 371 }
 372
 373 static void bot_cleanup_old_alt(struct f_uas *fu)
 374 {
 375         if (!(fu->flags & USBG_ENABLED))
 376                 return;
 377
 378         usb_ep_disable(fu->ep_in);
 379         usb_ep_disable(fu->ep_out);
 380
 381         if (!fu->bot_req_in)
 382                 return;
 383
 384         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
 385         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
 386         usb_ep_free_request(fu->ep_out, fu->cmd.req);
 387         usb_ep_free_request(fu->ep_out, fu->bot_status.req);
 388
 389         kfree(fu->cmd.buf);
 390
 391         fu->bot_req_in = NULL;
 392         fu->bot_req_out = NULL;
 393         fu->cmd.req = NULL;
 394         fu->bot_status.req = NULL;
 395         fu->cmd.buf = NULL;
 396 }
 397
 398 static void bot_set_alt(struct f_uas *fu)
 399 {
 400         struct usb_function *f = &fu->function;
 401         struct usb_gadget *gadget = f->config->cdev->gadget;
 402         int ret;
 403
 404         fu->flags = USBG_IS_BOT;
 405
 406         config_ep_by_speed(gadget, f, fu->ep_in);
 407         ret = usb_ep_enable(fu->ep_in);
 408         if (ret)
 409                 goto err_b_in;
 410
 411         config_ep_by_speed(gadget, f, fu->ep_out);
 412         ret = usb_ep_enable(fu->ep_out);
 413         if (ret)
 414                 goto err_b_out;
 415
 416         ret = bot_prepare_reqs(fu);
 417         if (ret)
 418                 goto err_wq;
 419         fu->flags |= USBG_ENABLED;
 420         pr_info("Using the BOT protocol\n");
 421         return;
 422 err_wq:
 423         usb_ep_disable(fu->ep_out);
 424 err_b_out:
 425         usb_ep_disable(fu->ep_in);
 426 err_b_in:
 427         fu->flags = USBG_IS_BOT;
 428 }
 429
 430 static int usbg_bot_setup(struct usb_function *f,
 431                 const struct usb_ctrlrequest *ctrl)
 432 {
 433         struct f_uas *fu = to_f_uas(f);
 434         struct usb_composite_dev *cdev = f->config->cdev;
 435         u16 w_value = le16_to_cpu(ctrl->wValue);
 436         u16 w_length = le16_to_cpu(ctrl->wLength);
 437         int luns;
 438         u8 *ret_lun;
 439
 440         switch (ctrl->bRequest) {
 441         case US_BULK_GET_MAX_LUN:
 442                 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
 443                                         USB_RECIP_INTERFACE))
 444                         return -ENOTSUPP;
 445
 446                 if (w_length < 1)
 447                         return -EINVAL;
 448                 if (w_value != 0)
 449                         return -EINVAL;
 450                 luns = atomic_read(&fu->tpg->tpg_port_count);
 451                 if (!luns) {
 452                         pr_err("No LUNs configured?\n");
 453                         return -EINVAL;
 454                 }
 455                 /*
 456                  * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
 457                  * accessed. The upper limit is 0xf
 458                  */
 459                 luns--;
 460                 if (luns > 0xf) {
 461                         pr_info_once("Limiting the number of luns to 16\n");
 462                         luns = 0xf;
 463                 }
 464                 ret_lun = cdev->req->buf;
 465                 *ret_lun = luns;
 466                 cdev->req->length = 1;
 467                 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
 468                 break;
 469
 470         case US_BULK_RESET_REQUEST:
 471                 /* XXX maybe we should remove previous requests for IN + OUT */
 472                 bot_enqueue_cmd_cbw(fu);
 473                 return 0;
 474                 break;
 475         }
 476         return -ENOTSUPP;
 477 }
 478
 479 /* Start uas.c code */
 480
 481 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
 482 {
 483         /* We have either all three allocated or none */
 484         if (!stream->req_in)
 485                 return;
 486
 487         usb_ep_free_request(fu->ep_in, stream->req_in);
 488         usb_ep_free_request(fu->ep_out, stream->req_out);
 489         usb_ep_free_request(fu->ep_status, stream->req_status);
 490
 491         stream->req_in = NULL;
 492         stream->req_out = NULL;
 493         stream->req_status = NULL;
 494 }
 495
 496 static void uasp_free_cmdreq(struct f_uas *fu)
 497 {
 498         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 499         kfree(fu->cmd.buf);
 500         fu->cmd.req = NULL;
 501         fu->cmd.buf = NULL;
 502 }
 503
 504 static void uasp_cleanup_old_alt(struct f_uas *fu)
 505 {
 506         int i;
 507
 508         if (!(fu->flags & USBG_ENABLED))
 509                 return;
 510
 511         usb_ep_disable(fu->ep_in);
 512         usb_ep_disable(fu->ep_out);
 513         usb_ep_disable(fu->ep_status);
 514         usb_ep_disable(fu->ep_cmd);
 515
 516         for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
 517                 uasp_cleanup_one_stream(fu, &fu->stream[i]);
 518         uasp_free_cmdreq(fu);
 519 }
 520
 521 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
 522
 523 static int uasp_prepare_r_request(struct usbg_cmd *cmd)
 524 {
 525         struct se_cmd *se_cmd = &cmd->se_cmd;
 526         struct f_uas *fu = cmd->fu;
 527         struct usb_gadget *gadget = fuas_to_gadget(fu);
 528         struct uas_stream *stream = cmd->stream;
 529
 530         if (!gadget->sg_supported) {
 531                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 532                 if (!cmd->data_buf)
 533                         return -ENOMEM;
 534
 535                 sg_copy_to_buffer(se_cmd->t_data_sg,
 536                                 se_cmd->t_data_nents,
 537                                 cmd->data_buf,
 538                                 se_cmd->data_length);
 539
 540                 stream->req_in->buf = cmd->data_buf;
 541         } else {
 542                 stream->req_in->buf = NULL;
 543                 stream->req_in->num_sgs = se_cmd->t_data_nents;
 544                 stream->req_in->sg = se_cmd->t_data_sg;
 545         }
 546
 547         stream->req_in->complete = uasp_status_data_cmpl;
 548         stream->req_in->length = se_cmd->data_length;
 549         stream->req_in->context = cmd;
 550
 551         cmd->state = UASP_SEND_STATUS;
 552         return 0;
 553 }
 554
 555 static void uasp_prepare_status(struct usbg_cmd *cmd)
 556 {
 557         struct se_cmd *se_cmd = &cmd->se_cmd;
 558         struct sense_iu *iu = &cmd->sense_iu;
 559         struct uas_stream *stream = cmd->stream;
 560
 561         cmd->state = UASP_QUEUE_COMMAND;
 562         iu->iu_id = IU_ID_STATUS;
 563         iu->tag = cpu_to_be16(cmd->tag);
 564
 565         /*
 566          * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
 567          */
 568         iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
 569         iu->status = se_cmd->scsi_status;
 570         stream->req_status->context = cmd;
 571         stream->req_status->length = se_cmd->scsi_sense_length + 16;
 572         stream->req_status->buf = iu;
 573         stream->req_status->complete = uasp_status_data_cmpl;
 574 }
 575
 576 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
 577 {
 578         struct usbg_cmd *cmd = req->context;
 579         struct uas_stream *stream = cmd->stream;
 580         struct f_uas *fu = cmd->fu;
 581         int ret;
 582
 583         if (req->status < 0)
 584                 goto cleanup;
 585
 586         switch (cmd->state) {
 587         case UASP_SEND_DATA:
 588                 ret = uasp_prepare_r_request(cmd);
 589                 if (ret)
 590                         goto cleanup;
 591                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 592                 if (ret)
 593                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 594                 break;
 595
 596         case UASP_RECEIVE_DATA:
 597                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 598                 if (ret)
 599                         goto cleanup;
 600                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 601                 if (ret)
 602                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 603                 break;
 604
 605         case UASP_SEND_STATUS:
 606                 uasp_prepare_status(cmd);
 607                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 608                                 GFP_ATOMIC);
 609                 if (ret)
 610                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 611                 break;
 612
 613         case UASP_QUEUE_COMMAND:
 614                 usbg_cleanup_cmd(cmd);
 615                 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 616                 break;
 617
 618         default:
 619                 BUG();
 620         }
 621         return;
 622
 623 cleanup:
 624         usbg_cleanup_cmd(cmd);
 625 }
 626
 627 static int uasp_send_status_response(struct usbg_cmd *cmd)
 628 {
 629         struct f_uas *fu = cmd->fu;
 630         struct uas_stream *stream = cmd->stream;
 631         struct sense_iu *iu = &cmd->sense_iu;
 632
 633         iu->tag = cpu_to_be16(cmd->tag);
 634         stream->req_status->complete = uasp_status_data_cmpl;
 635         stream->req_status->context = cmd;
 636         cmd->fu = fu;
 637         uasp_prepare_status(cmd);
 638         return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
 639 }
 640
 641 static int uasp_send_read_response(struct usbg_cmd *cmd)
 642 {
 643         struct f_uas *fu = cmd->fu;
 644         struct uas_stream *stream = cmd->stream;
 645         struct sense_iu *iu = &cmd->sense_iu;
 646         int ret;
 647
 648         cmd->fu = fu;
 649
 650         iu->tag = cpu_to_be16(cmd->tag);
 651         if (fu->flags & USBG_USE_STREAMS) {
 652
 653                 ret = uasp_prepare_r_request(cmd);
 654                 if (ret)
 655                         goto out;
 656                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 657                 if (ret) {
 658                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 659                         kfree(cmd->data_buf);
 660                         cmd->data_buf = NULL;
 661                 }
 662
 663         } else {
 664
 665                 iu->iu_id = IU_ID_READ_READY;
 666                 iu->tag = cpu_to_be16(cmd->tag);
 667
 668                 stream->req_status->complete = uasp_status_data_cmpl;
 669                 stream->req_status->context = cmd;
 670
 671                 cmd->state = UASP_SEND_DATA;
 672                 stream->req_status->buf = iu;
 673                 stream->req_status->length = sizeof(struct iu);
 674
 675                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 676                                 GFP_ATOMIC);
 677                 if (ret)
 678                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 679         }
 680 out:
 681         return ret;
 682 }
 683
 684 static int uasp_send_write_request(struct usbg_cmd *cmd)
 685 {
 686         struct f_uas *fu = cmd->fu;
 687         struct se_cmd *se_cmd = &cmd->se_cmd;
 688         struct uas_stream *stream = cmd->stream;
 689         struct sense_iu *iu = &cmd->sense_iu;
 690         int ret;
 691
 692         init_completion(&cmd->write_complete);
 693         cmd->fu = fu;
 694
 695         iu->tag = cpu_to_be16(cmd->tag);
 696
 697         if (fu->flags & USBG_USE_STREAMS) {
 698
 699                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 700                 if (ret)
 701                         goto cleanup;
 702                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 703                 if (ret)
 704                         pr_err("%s(%d)\n", __func__, __LINE__);
 705
 706         } else {
 707
 708                 iu->iu_id = IU_ID_WRITE_READY;
 709                 iu->tag = cpu_to_be16(cmd->tag);
 710
 711                 stream->req_status->complete = uasp_status_data_cmpl;
 712                 stream->req_status->context = cmd;
 713
 714                 cmd->state = UASP_RECEIVE_DATA;
 715                 stream->req_status->buf = iu;
 716                 stream->req_status->length = sizeof(struct iu);
 717
 718                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 719                                 GFP_ATOMIC);
 720                 if (ret)
 721                         pr_err("%s(%d)\n", __func__, __LINE__);
 722         }
 723
 724         wait_for_completion(&cmd->write_complete);
 725         target_execute_cmd(se_cmd);
 726 cleanup:
 727         return ret;
 728 }
 729
 730 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
 731
 732 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
 733 {
 734         struct f_uas *fu = req->context;
 735         int ret;
 736
 737         if (req->status < 0)
 738                 return;
 739
 740         ret = usbg_submit_command(fu, req->buf, req->actual);
 741         /*
 742          * Once we tune for performance enqueue the command req here again so
 743          * we can receive a second command while we processing this one. Pay
 744          * attention to properly sync STAUS endpoint with DATA IN + OUT so you
 745          * don't break HS.
 746          */
 747         if (!ret)
 748                 return;
 749         usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 750 }
 751
 752 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
 753 {
 754         stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 755         if (!stream->req_in)
 756                 goto out;
 757
 758         stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 759         if (!stream->req_out)
 760                 goto err_out;
 761
 762         stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
 763         if (!stream->req_status)
 764                 goto err_sts;
 765
 766         return 0;
 767 err_sts:
 768         usb_ep_free_request(fu->ep_status, stream->req_status);
 769         stream->req_status = NULL;
 770 err_out:
 771         usb_ep_free_request(fu->ep_out, stream->req_out);
 772         stream->req_out = NULL;
 773 out:
 774         return -ENOMEM;
 775 }
 776
 777 static int uasp_alloc_cmd(struct f_uas *fu)
 778 {
 779         fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
 780         if (!fu->cmd.req)
 781                 goto err;
 782
 783         fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
 784         if (!fu->cmd.buf)
 785                 goto err_buf;
 786
 787         fu->cmd.req->complete = uasp_cmd_complete;
 788         fu->cmd.req->buf = fu->cmd.buf;
 789         fu->cmd.req->length = fu->ep_cmd->maxpacket;
 790         fu->cmd.req->context = fu;
 791         return 0;
 792
 793 err_buf:
 794         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 795 err:
 796         return -ENOMEM;
 797 }
 798
 799 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
 800 {
 801         int i;
 802
 803         for (i = 0; i < max_streams; i++) {
 804                 struct uas_stream *s = &fu->stream[i];
 805
 806                 s->req_in->stream_id = i + 1;
 807                 s->req_out->stream_id = i + 1;
 808                 s->req_status->stream_id = i + 1;
 809         }
 810 }
 811
 812 static int uasp_prepare_reqs(struct f_uas *fu)
 813 {
 814         int ret;
 815         int i;
 816         int max_streams;
 817
 818         if (fu->flags & USBG_USE_STREAMS)
 819                 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
 820         else
 821                 max_streams = 1;
 822
 823         for (i = 0; i < max_streams; i++) {
 824                 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
 825                 if (ret)
 826                         goto err_cleanup;
 827         }
 828
 829         ret = uasp_alloc_cmd(fu);
 830         if (ret)
 831                 goto err_free_stream;
 832         uasp_setup_stream_res(fu, max_streams);
 833
 834         ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 835         if (ret)
 836                 goto err_free_stream;
 837
 838         return 0;
 839
 840 err_free_stream:
 841         uasp_free_cmdreq(fu);
 842
 843 err_cleanup:
 844         if (i) {
 845                 do {
 846                         uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
 847                         i--;
 848                 } while (i);
 849         }
 850         pr_err("UASP: endpoint setup failed\n");
 851         return ret;
 852 }
 853
 854 static void uasp_set_alt(struct f_uas *fu)
 855 {
 856         struct usb_function *f = &fu->function;
 857         struct usb_gadget *gadget = f->config->cdev->gadget;
 858         int ret;
 859
 860         fu->flags = USBG_IS_UAS;
 861
 862         if (gadget->speed == USB_SPEED_SUPER)
 863                 fu->flags |= USBG_USE_STREAMS;
 864
 865         config_ep_by_speed(gadget, f, fu->ep_in);
 866         ret = usb_ep_enable(fu->ep_in);
 867         if (ret)
 868                 goto err_b_in;
 869
 870         config_ep_by_speed(gadget, f, fu->ep_out);
 871         ret = usb_ep_enable(fu->ep_out);
 872         if (ret)
 873                 goto err_b_out;
 874
 875         config_ep_by_speed(gadget, f, fu->ep_cmd);
 876         ret = usb_ep_enable(fu->ep_cmd);
 877         if (ret)
 878                 goto err_cmd;
 879         config_ep_by_speed(gadget, f, fu->ep_status);
 880         ret = usb_ep_enable(fu->ep_status);
 881         if (ret)
 882                 goto err_status;
 883
 884         ret = uasp_prepare_reqs(fu);
 885         if (ret)
 886                 goto err_wq;
 887         fu->flags |= USBG_ENABLED;
 888
 889         pr_info("Using the UAS protocol\n");
 890         return;
 891 err_wq:
 892         usb_ep_disable(fu->ep_status);
 893 err_status:
 894         usb_ep_disable(fu->ep_cmd);
 895 err_cmd:
 896         usb_ep_disable(fu->ep_out);
 897 err_b_out:
 898         usb_ep_disable(fu->ep_in);
 899 err_b_in:
 900         fu->flags = 0;
 901 }
 902
 903 static int get_cmd_dir(const unsigned char *cdb)
 904 {
 905         int ret;
 906
 907         switch (cdb[0]) {
 908         case READ_6:
 909         case READ_10:
 910         case READ_12:
 911         case READ_16:
 912         case INQUIRY:
 913         case MODE_SENSE:
 914         case MODE_SENSE_10:
 915         case SERVICE_ACTION_IN:
 916         case MAINTENANCE_IN:
 917         case PERSISTENT_RESERVE_IN:
 918         case SECURITY_PROTOCOL_IN:
 919         case ACCESS_CONTROL_IN:
 920         case REPORT_LUNS:
 921         case READ_BLOCK_LIMITS:
 922         case READ_POSITION:
 923         case READ_CAPACITY:
 924         case READ_TOC:
 925         case READ_FORMAT_CAPACITIES:
 926         case REQUEST_SENSE:
 927                 ret = DMA_FROM_DEVICE;
 928                 break;
 929
 930         case WRITE_6:
 931         case WRITE_10:
 932         case WRITE_12:
 933         case WRITE_16:
 934         case MODE_SELECT:
 935         case MODE_SELECT_10:
 936         case WRITE_VERIFY:
 937         case WRITE_VERIFY_12:
 938         case PERSISTENT_RESERVE_OUT:
 939         case MAINTENANCE_OUT:
 940         case SECURITY_PROTOCOL_OUT:
 941         case ACCESS_CONTROL_OUT:
 942                 ret = DMA_TO_DEVICE;
 943                 break;
 944         case ALLOW_MEDIUM_REMOVAL:
 945         case TEST_UNIT_READY:
 946         case SYNCHRONIZE_CACHE:
 947         case START_STOP:
 948         case ERASE:
 949         case REZERO_UNIT:
 950         case SEEK_10:
 951         case SPACE:
 952         case VERIFY:
 953         case WRITE_FILEMARKS:
 954                 ret = DMA_NONE;
 955                 break;
 956         default:
 957                 pr_warn("target: Unknown data direction for SCSI Opcode "
 958                                 "0x%02x\n", cdb[0]);
 959                 ret = -EINVAL;
 960         }
 961         return ret;
 962 }
 963
 964 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
 965 {
 966         struct usbg_cmd *cmd = req->context;
 967         struct se_cmd *se_cmd = &cmd->se_cmd;
 968
 969         if (req->status < 0) {
 970                 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
 971                 goto cleanup;
 972         }
 973
 974         if (req->num_sgs == 0) {
 975                 sg_copy_from_buffer(se_cmd->t_data_sg,
 976                                 se_cmd->t_data_nents,
 977                                 cmd->data_buf,
 978                                 se_cmd->data_length);
 979         }
 980
 981         complete(&cmd->write_complete);
 982         return;
 983
 984 cleanup:
 985         usbg_cleanup_cmd(cmd);
 986 }
 987
 988 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
 989 {
 990         struct se_cmd *se_cmd = &cmd->se_cmd;
 991         struct f_uas *fu = cmd->fu;
 992         struct usb_gadget *gadget = fuas_to_gadget(fu);
 993
 994         if (!gadget->sg_supported) {
 995                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 996                 if (!cmd->data_buf)
 997                         return -ENOMEM;
 998
 999                 req->buf = cmd->data_buf;
1000         } else {
1001                 req->buf = NULL;
1002                 req->num_sgs = se_cmd->t_data_nents;
1003                 req->sg = se_cmd->t_data_sg;
1004         }
1005
1006         req->complete = usbg_data_write_cmpl;
1007         req->length = se_cmd->data_length;
1008         req->context = cmd;
1009         return 0;
1010 }
1011
1012 static int usbg_send_status_response(struct se_cmd *se_cmd)
1013 {
1014         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1015                         se_cmd);
1016         struct f_uas *fu = cmd->fu;
1017
1018         if (fu->flags & USBG_IS_BOT)
1019                 return bot_send_status_response(cmd);
1020         else
1021                 return uasp_send_status_response(cmd);
1022 }
1023
1024 static int usbg_send_write_request(struct se_cmd *se_cmd)
1025 {
1026         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1027                         se_cmd);
1028         struct f_uas *fu = cmd->fu;
1029
1030         if (fu->flags & USBG_IS_BOT)
1031                 return bot_send_write_request(cmd);
1032         else
1033                 return uasp_send_write_request(cmd);
1034 }
1035
1036 static int usbg_send_read_response(struct se_cmd *se_cmd)
1037 {
1038         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1039                         se_cmd);
1040         struct f_uas *fu = cmd->fu;
1041
1042         if (fu->flags & USBG_IS_BOT)
1043                 return bot_send_read_response(cmd);
1044         else
1045                 return uasp_send_read_response(cmd);
1046 }
1047
1048 static void usbg_cmd_work(struct work_struct *work)
1049 {
1050         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1051         struct se_cmd *se_cmd;
1052         struct tcm_usbg_nexus *tv_nexus;
1053         struct usbg_tpg *tpg;
1054         int dir;
1055
1056         se_cmd = &cmd->se_cmd;
1057         tpg = cmd->fu->tpg;
1058         tv_nexus = tpg->tpg_nexus;
1059         dir = get_cmd_dir(cmd->cmd_buf);
1060         if (dir < 0) {
1061                 transport_init_se_cmd(se_cmd,
1062                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1063                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1064                                 cmd->prio_attr, cmd->sense_iu.sense);
1065                 goto out;
1066         }
1067
1068         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1069                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1070                         0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1071                 goto out;
1072
1073         return;
1074
1075 out:
1076         transport_send_check_condition_and_sense(se_cmd,
1077                         TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1078         usbg_cleanup_cmd(cmd);
1079 }
1080
1081 static int usbg_submit_command(struct f_uas *fu,
1082                 void *cmdbuf, unsigned int len)
1083 {
1084         struct command_iu *cmd_iu = cmdbuf;
1085         struct usbg_cmd *cmd;
1086         struct usbg_tpg *tpg;
1087         struct se_cmd *se_cmd;
1088         struct tcm_usbg_nexus *tv_nexus;
1089         u32 cmd_len;
1090         int ret;
1091
1092         if (cmd_iu->iu_id != IU_ID_COMMAND) {
1093                 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1094                 return -EINVAL;
1095         }
1096
1097         cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1098         if (!cmd)
1099                 return -ENOMEM;
1100
1101         cmd->fu = fu;
1102
1103         /* XXX until I figure out why I can't free in on complete */
1104         kref_init(&cmd->ref);
1105         kref_get(&cmd->ref);
1106
1107         tpg = fu->tpg;
1108         cmd_len = (cmd_iu->len & ~0x3) + 16;
1109         if (cmd_len > USBG_MAX_CMD)
1110                 goto err;
1111
1112         memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1113
1114         cmd->tag = be16_to_cpup(&cmd_iu->tag);
1115         if (fu->flags & USBG_USE_STREAMS) {
1116                 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1117                         goto err;
1118                 if (!cmd->tag)
1119                         cmd->stream = &fu->stream[0];
1120                 else
1121                         cmd->stream = &fu->stream[cmd->tag - 1];
1122         } else {
1123                 cmd->stream = &fu->stream[0];
1124         }
1125
1126         tv_nexus = tpg->tpg_nexus;
1127         if (!tv_nexus) {
1128                 pr_err("Missing nexus, ignoring command\n");
1129                 goto err;
1130         }
1131
1132         switch (cmd_iu->prio_attr & 0x7) {
1133         case UAS_HEAD_TAG:
1134                 cmd->prio_attr = MSG_HEAD_TAG;
1135                 break;
1136         case UAS_ORDERED_TAG:
1137                 cmd->prio_attr = MSG_ORDERED_TAG;
1138                 break;
1139         case UAS_ACA:
1140                 cmd->prio_attr = MSG_ACA_TAG;
1141                 break;
1142         default:
1143                 pr_debug_once("Unsupported prio_attr: %02x.\n",
1144                                 cmd_iu->prio_attr);
1145         case UAS_SIMPLE_TAG:
1146                 cmd->prio_attr = MSG_SIMPLE_TAG;
1147                 break;
1148         }
1149
1150         se_cmd = &cmd->se_cmd;
1151         cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1152
1153         INIT_WORK(&cmd->work, usbg_cmd_work);
1154         ret = queue_work(tpg->workqueue, &cmd->work);
1155         if (ret < 0)
1156                 goto err;
1157
1158         return 0;
1159 err:
1160         kfree(cmd);
1161         return -EINVAL;
1162 }
1163
1164 static void bot_cmd_work(struct work_struct *work)
1165 {
1166         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1167         struct se_cmd *se_cmd;
1168         struct tcm_usbg_nexus *tv_nexus;
1169         struct usbg_tpg *tpg;
1170         int dir;
1171
1172         se_cmd = &cmd->se_cmd;
1173         tpg = cmd->fu->tpg;
1174         tv_nexus = tpg->tpg_nexus;
1175         dir = get_cmd_dir(cmd->cmd_buf);
1176         if (dir < 0) {
1177                 transport_init_se_cmd(se_cmd,
1178                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1179                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1180                                 cmd->prio_attr, cmd->sense_iu.sense);
1181                 goto out;
1182         }
1183
1184         if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1185                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1186                         cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1187                 goto out;
1188
1189         return;
1190
1191 out:
1192         transport_send_check_condition_and_sense(se_cmd,
1193                                 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1194         usbg_cleanup_cmd(cmd);
1195 }
1196
1197 static int bot_submit_command(struct f_uas *fu,
1198                 void *cmdbuf, unsigned int len)
1199 {
1200         struct bulk_cb_wrap *cbw = cmdbuf;
1201         struct usbg_cmd *cmd;
1202         struct usbg_tpg *tpg;
1203         struct se_cmd *se_cmd;
1204         struct tcm_usbg_nexus *tv_nexus;
1205         u32 cmd_len;
1206         int ret;
1207
1208         if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1209                 pr_err("Wrong signature on CBW\n");
1210                 return -EINVAL;
1211         }
1212         if (len != 31) {
1213                 pr_err("Wrong length for CBW\n");
1214                 return -EINVAL;
1215         }
1216
1217         cmd_len = cbw->Length;
1218         if (cmd_len < 1 || cmd_len > 16)
1219                 return -EINVAL;
1220
1221         cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1222         if (!cmd)
1223                 return -ENOMEM;
1224
1225         cmd->fu = fu;
1226
1227         /* XXX until I figure out why I can't free in on complete */
1228         kref_init(&cmd->ref);
1229         kref_get(&cmd->ref);
1230
1231         tpg = fu->tpg;
1232
1233         memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1234
1235         cmd->bot_tag = cbw->Tag;
1236
1237         tv_nexus = tpg->tpg_nexus;
1238         if (!tv_nexus) {
1239                 pr_err("Missing nexus, ignoring command\n");
1240                 goto err;
1241         }
1242
1243         cmd->prio_attr = MSG_SIMPLE_TAG;
1244         se_cmd = &cmd->se_cmd;
1245         cmd->unpacked_lun = cbw->Lun;
1246         cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1247         cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1248
1249         INIT_WORK(&cmd->work, bot_cmd_work);
1250         ret = queue_work(tpg->workqueue, &cmd->work);
1251         if (ret < 0)
1252                 goto err;
1253
1254         return 0;
1255 err:
1256         kfree(cmd);
1257         return -EINVAL;
1258 }
1259
1260 /* Start fabric.c code */
1261
1262 static int usbg_check_true(struct se_portal_group *se_tpg)
1263 {
1264         return 1;
1265 }
1266
1267 static int usbg_check_false(struct se_portal_group *se_tpg)
1268 {
1269         return 0;
1270 }
1271
1272 static char *usbg_get_fabric_name(void)
1273 {
1274         return "usb_gadget";
1275 }
1276
1277 static u8 usbg_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1278 {
1279         struct usbg_tpg *tpg = container_of(se_tpg,
1280                                 struct usbg_tpg, se_tpg);
1281         struct usbg_tport *tport = tpg->tport;
1282         u8 proto_id;
1283
1284         switch (tport->tport_proto_id) {
1285         case SCSI_PROTOCOL_SAS:
1286         default:
1287                 proto_id = sas_get_fabric_proto_ident(se_tpg);
1288                 break;
1289         }
1290
1291         return proto_id;
1292 }
1293
1294 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1295 {
1296         struct usbg_tpg *tpg = container_of(se_tpg,
1297                                 struct usbg_tpg, se_tpg);
1298         struct usbg_tport *tport = tpg->tport;
1299
1300         return &tport->tport_name[0];
1301 }
1302
1303 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1304 {
1305         struct usbg_tpg *tpg = container_of(se_tpg,
1306                                 struct usbg_tpg, se_tpg);
1307         return tpg->tport_tpgt;
1308 }
1309
1310 static u32 usbg_get_default_depth(struct se_portal_group *se_tpg)
1311 {
1312         return 1;
1313 }
1314
1315 static u32 usbg_get_pr_transport_id(
1316         struct se_portal_group *se_tpg,
1317         struct se_node_acl *se_nacl,
1318         struct t10_pr_registration *pr_reg,
1319         int *format_code,
1320         unsigned char *buf)
1321 {
1322         struct usbg_tpg *tpg = container_of(se_tpg,
1323                                 struct usbg_tpg, se_tpg);
1324         struct usbg_tport *tport = tpg->tport;
1325         int ret = 0;
1326
1327         switch (tport->tport_proto_id) {
1328         case SCSI_PROTOCOL_SAS:
1329         default:
1330                 ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1331                                         format_code, buf);
1332                 break;
1333         }
1334
1335         return ret;
1336 }
1337
1338 static u32 usbg_get_pr_transport_id_len(
1339         struct se_portal_group *se_tpg,
1340         struct se_node_acl *se_nacl,
1341         struct t10_pr_registration *pr_reg,
1342         int *format_code)
1343 {
1344         struct usbg_tpg *tpg = container_of(se_tpg,
1345                                 struct usbg_tpg, se_tpg);
1346         struct usbg_tport *tport = tpg->tport;
1347         int ret = 0;
1348
1349         switch (tport->tport_proto_id) {
1350         case SCSI_PROTOCOL_SAS:
1351         default:
1352                 ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1353                                         format_code);
1354                 break;
1355         }
1356
1357         return ret;
1358 }
1359
1360 static char *usbg_parse_pr_out_transport_id(
1361         struct se_portal_group *se_tpg,
1362         const char *buf,
1363         u32 *out_tid_len,
1364         char **port_nexus_ptr)
1365 {
1366         struct usbg_tpg *tpg = container_of(se_tpg,
1367                                 struct usbg_tpg, se_tpg);
1368         struct usbg_tport *tport = tpg->tport;
1369         char *tid = NULL;
1370
1371         switch (tport->tport_proto_id) {
1372         case SCSI_PROTOCOL_SAS:
1373         default:
1374                 tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1375                                         port_nexus_ptr);
1376         }
1377
1378         return tid;
1379 }
1380
1381 static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg)
1382 {
1383         struct usbg_nacl *nacl;
1384
1385         nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL);
1386         if (!nacl) {
1387                 printk(KERN_ERR "Unable to allocate struct usbg_nacl\n");
1388                 return NULL;
1389         }
1390
1391         return &nacl->se_node_acl;
1392 }
1393
1394 static void usbg_release_fabric_acl(
1395         struct se_portal_group *se_tpg,
1396         struct se_node_acl *se_nacl)
1397 {
1398         struct usbg_nacl *nacl = container_of(se_nacl,
1399                         struct usbg_nacl, se_node_acl);
1400         kfree(nacl);
1401 }
1402
1403 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1404 {
1405         return 1;
1406 }
1407
1408 static void usbg_cmd_release(struct kref *ref)
1409 {
1410         struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1411                         ref);
1412
1413         transport_generic_free_cmd(&cmd->se_cmd, 0);
1414 }
1415
1416 static void usbg_release_cmd(struct se_cmd *se_cmd)
1417 {
1418         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1419                         se_cmd);
1420         kfree(cmd->data_buf);
1421         kfree(cmd);
1422         return;
1423 }
1424
1425 static int usbg_shutdown_session(struct se_session *se_sess)
1426 {
1427         return 0;
1428 }
1429
1430 static void usbg_close_session(struct se_session *se_sess)
1431 {
1432         return;
1433 }
1434
1435 static u32 usbg_sess_get_index(struct se_session *se_sess)
1436 {
1437         return 0;
1438 }
1439
1440 /*
1441  * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1442  */
1443 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1444 {
1445         return 0;
1446 }
1447
1448 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1449 {
1450         return;
1451 }
1452
1453 static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
1454 {
1455         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1456                         se_cmd);
1457         struct f_uas *fu = cmd->fu;
1458
1459         if (fu->flags & USBG_IS_BOT)
1460                 return le32_to_cpu(cmd->bot_tag);
1461         else
1462                 return cmd->tag;
1463 }
1464
1465 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1466 {
1467         return 0;
1468 }
1469
1470 static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1471 {
1472 }
1473
1474 static const char *usbg_check_wwn(const char *name)
1475 {
1476         const char *n;
1477         unsigned int len;
1478
1479         n = strstr(name, "naa.");
1480         if (!n)
1481                 return NULL;
1482         n += 4;
1483         len = strlen(n);
1484         if (len == 0 || len > USBG_NAMELEN - 1)
1485                 return NULL;
1486         return n;
1487 }
1488
1489 static struct se_node_acl *usbg_make_nodeacl(
1490         struct se_portal_group *se_tpg,
1491         struct config_group *group,
1492         const char *name)
1493 {
1494         struct se_node_acl *se_nacl, *se_nacl_new;
1495         struct usbg_nacl *nacl;
1496         u64 wwpn = 0;
1497         u32 nexus_depth;
1498         const char *wnn_name;
1499
1500         wnn_name = usbg_check_wwn(name);
1501         if (!wnn_name)
1502                 return ERR_PTR(-EINVAL);
1503         se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1504         if (!(se_nacl_new))
1505                 return ERR_PTR(-ENOMEM);
1506
1507         nexus_depth = 1;
1508         /*
1509          * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1510          * when converting a NodeACL from demo mode -> explict
1511          */
1512         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1513                                 name, nexus_depth);
1514         if (IS_ERR(se_nacl)) {
1515                 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1516                 return se_nacl;
1517         }
1518         /*
1519          * Locate our struct usbg_nacl and set the FC Nport WWPN
1520          */
1521         nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
1522         nacl->iport_wwpn = wwpn;
1523         snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
1524         return se_nacl;
1525 }
1526
1527 static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1528 {
1529         struct usbg_nacl *nacl = container_of(se_acl,
1530                                 struct usbg_nacl, se_node_acl);
1531         core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1532         kfree(nacl);
1533 }
1534
1535 struct usbg_tpg *the_only_tpg_I_currently_have;
1536
1537 static struct se_portal_group *usbg_make_tpg(
1538         struct se_wwn *wwn,
1539         struct config_group *group,
1540         const char *name)
1541 {
1542         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1543                         tport_wwn);
1544         struct usbg_tpg *tpg;
1545         unsigned long tpgt;
1546         int ret;
1547
1548         if (strstr(name, "tpgt_") != name)
1549                 return ERR_PTR(-EINVAL);
1550         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1551                 return ERR_PTR(-EINVAL);
1552         if (the_only_tpg_I_currently_have) {
1553                 pr_err("Until the gadget framework can't handle multiple\n");
1554                 pr_err("gadgets, you can't do this here.\n");
1555                 return ERR_PTR(-EBUSY);
1556         }
1557
1558         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1559         if (!tpg) {
1560                 printk(KERN_ERR "Unable to allocate struct usbg_tpg");
1561                 return ERR_PTR(-ENOMEM);
1562         }
1563         mutex_init(&tpg->tpg_mutex);
1564         atomic_set(&tpg->tpg_port_count, 0);
1565         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1566         if (!tpg->workqueue) {
1567                 kfree(tpg);
1568                 return NULL;
1569         }
1570
1571         tpg->tport = tport;
1572         tpg->tport_tpgt = tpgt;
1573
1574         ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
1575                                 &tpg->se_tpg, tpg,
1576                                 TRANSPORT_TPG_TYPE_NORMAL);
1577         if (ret < 0) {
1578                 destroy_workqueue(tpg->workqueue);
1579                 kfree(tpg);
1580                 return NULL;
1581         }
1582         the_only_tpg_I_currently_have = tpg;
1583         return &tpg->se_tpg;
1584 }
1585
1586 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1587 {
1588         struct usbg_tpg *tpg = container_of(se_tpg,
1589                                 struct usbg_tpg, se_tpg);
1590
1591         core_tpg_deregister(se_tpg);
1592         destroy_workqueue(tpg->workqueue);
1593         kfree(tpg);
1594         the_only_tpg_I_currently_have = NULL;
1595 }
1596
1597 static struct se_wwn *usbg_make_tport(
1598         struct target_fabric_configfs *tf,
1599         struct config_group *group,
1600         const char *name)
1601 {
1602         struct usbg_tport *tport;
1603         const char *wnn_name;
1604         u64 wwpn = 0;
1605
1606         wnn_name = usbg_check_wwn(name);
1607         if (!wnn_name)
1608                 return ERR_PTR(-EINVAL);
1609
1610         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1611         if (!(tport)) {
1612                 printk(KERN_ERR "Unable to allocate struct usbg_tport");
1613                 return ERR_PTR(-ENOMEM);
1614         }
1615         tport->tport_wwpn = wwpn;
1616         snprintf(tport->tport_name, sizeof(tport->tport_name), wnn_name);
1617         return &tport->tport_wwn;
1618 }
1619
1620 static void usbg_drop_tport(struct se_wwn *wwn)
1621 {
1622         struct usbg_tport *tport = container_of(wwn,
1623                                 struct usbg_tport, tport_wwn);
1624         kfree(tport);
1625 }
1626
1627 /*
1628  * If somebody feels like dropping the version property, go ahead.
1629  */
1630 static ssize_t usbg_wwn_show_attr_version(
1631         struct target_fabric_configfs *tf,
1632         char *page)
1633 {
1634         return sprintf(page, "usb-gadget fabric module\n");
1635 }
1636 TF_WWN_ATTR_RO(usbg, version);
1637
1638 static struct configfs_attribute *usbg_wwn_attrs[] = {
1639         &usbg_wwn_version.attr,
1640         NULL,
1641 };
1642
1643 static ssize_t tcm_usbg_tpg_show_enable(
1644                 struct se_portal_group *se_tpg,
1645                 char *page)
1646 {
1647         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1648
1649         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1650 }
1651
1652 static int usbg_attach(struct usbg_tpg *);
1653 static void usbg_detach(struct usbg_tpg *);
1654
1655 static ssize_t tcm_usbg_tpg_store_enable(
1656                 struct se_portal_group *se_tpg,
1657                 const char *page,
1658                 size_t count)
1659 {
1660         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1661         unsigned long op;
1662         ssize_t ret;
1663
1664         ret = kstrtoul(page, 0, &op);
1665         if (ret < 0)
1666                 return -EINVAL;
1667         if (op > 1)
1668                 return -EINVAL;
1669
1670         if (op && tpg->gadget_connect)
1671                 goto out;
1672         if (!op && !tpg->gadget_connect)
1673                 goto out;
1674
1675         if (op) {
1676                 ret = usbg_attach(tpg);
1677                 if (ret)
1678                         goto out;
1679         } else {
1680                 usbg_detach(tpg);
1681         }
1682         tpg->gadget_connect = op;
1683 out:
1684         return count;
1685 }
1686 TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1687
1688 static ssize_t tcm_usbg_tpg_show_nexus(
1689                 struct se_portal_group *se_tpg,
1690                 char *page)
1691 {
1692         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1693         struct tcm_usbg_nexus *tv_nexus;
1694         ssize_t ret;
1695
1696         mutex_lock(&tpg->tpg_mutex);
1697         tv_nexus = tpg->tpg_nexus;
1698         if (!tv_nexus) {
1699                 ret = -ENODEV;
1700                 goto out;
1701         }
1702         ret = snprintf(page, PAGE_SIZE, "%s\n",
1703                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1704 out:
1705         mutex_unlock(&tpg->tpg_mutex);
1706         return ret;
1707 }
1708
1709 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1710 {
1711         struct se_portal_group *se_tpg;
1712         struct tcm_usbg_nexus *tv_nexus;
1713         int ret;
1714
1715         mutex_lock(&tpg->tpg_mutex);
1716         if (tpg->tpg_nexus) {
1717                 ret = -EEXIST;
1718                 pr_debug("tpg->tpg_nexus already exists\n");
1719                 goto err_unlock;
1720         }
1721         se_tpg = &tpg->se_tpg;
1722
1723         ret = -ENOMEM;
1724         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1725         if (!tv_nexus) {
1726                 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1727                 goto err_unlock;
1728         }
1729         tv_nexus->tvn_se_sess = transport_init_session();
1730         if (IS_ERR(tv_nexus->tvn_se_sess))
1731                 goto err_free;
1732
1733         /*
1734          * Since we are running in 'demo mode' this call with generate a
1735          * struct se_node_acl for the tcm_vhost struct se_portal_group with
1736          * the SCSI Initiator port name of the passed configfs group 'name'.
1737          */
1738         tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1739                         se_tpg, name);
1740         if (!tv_nexus->tvn_se_sess->se_node_acl) {
1741                 pr_debug("core_tpg_check_initiator_node_acl() failed"
1742                                 " for %s\n", name);
1743                 goto err_session;
1744         }
1745         /*
1746          * Now register the TCM vHost virtual I_T Nexus as active with the
1747          * call to __transport_register_session()
1748          */
1749         __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1750                         tv_nexus->tvn_se_sess, tv_nexus);
1751         tpg->tpg_nexus = tv_nexus;
1752         mutex_unlock(&tpg->tpg_mutex);
1753         return 0;
1754
1755 err_session:
1756         transport_free_session(tv_nexus->tvn_se_sess);
1757 err_free:
1758         kfree(tv_nexus);
1759 err_unlock:
1760         mutex_unlock(&tpg->tpg_mutex);
1761         return ret;
1762 }
1763
1764 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1765 {
1766         struct se_session *se_sess;
1767         struct tcm_usbg_nexus *tv_nexus;
1768         int ret = -ENODEV;
1769
1770         mutex_lock(&tpg->tpg_mutex);
1771         tv_nexus = tpg->tpg_nexus;
1772         if (!tv_nexus)
1773                 goto out;
1774
1775         se_sess = tv_nexus->tvn_se_sess;
1776         if (!se_sess)
1777                 goto out;
1778
1779         if (atomic_read(&tpg->tpg_port_count)) {
1780                 ret = -EPERM;
1781                 pr_err("Unable to remove Host I_T Nexus with"
1782                                 " active TPG port count: %d\n",
1783                                 atomic_read(&tpg->tpg_port_count));
1784                 goto out;
1785         }
1786
1787         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1788                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1789         /*
1790          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1791          */
1792         transport_deregister_session(tv_nexus->tvn_se_sess);
1793         tpg->tpg_nexus = NULL;
1794
1795         kfree(tv_nexus);
1796         ret = 0;
1797 out:
1798         mutex_unlock(&tpg->tpg_mutex);
1799         return ret;
1800 }
1801
1802 static ssize_t tcm_usbg_tpg_store_nexus(
1803                 struct se_portal_group *se_tpg,
1804                 const char *page,
1805                 size_t count)
1806 {
1807         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1808         unsigned char i_port[USBG_NAMELEN], *ptr;
1809         int ret;
1810
1811         if (!strncmp(page, "NULL", 4)) {
1812                 ret = tcm_usbg_drop_nexus(tpg);
1813                 return (!ret) ? count : ret;
1814         }
1815         if (strlen(page) >= USBG_NAMELEN) {
1816                 pr_err("Emulated NAA Sas Address: %s, exceeds"
1817                                 " max: %d\n", page, USBG_NAMELEN);
1818                 return -EINVAL;
1819         }
1820         snprintf(i_port, USBG_NAMELEN, "%s", page);
1821
1822         ptr = strstr(i_port, "naa.");
1823         if (!ptr) {
1824                 pr_err("Missing 'naa.' prefix\n");
1825                 return -EINVAL;
1826         }
1827
1828         if (i_port[strlen(i_port) - 1] == '\n')
1829                 i_port[strlen(i_port) - 1] = '\0';
1830
1831         ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1832         if (ret < 0)
1833                 return ret;
1834         return count;
1835 }
1836 TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1837
1838 static struct configfs_attribute *usbg_base_attrs[] = {
1839         &tcm_usbg_tpg_enable.attr,
1840         &tcm_usbg_tpg_nexus.attr,
1841         NULL,
1842 };
1843
1844 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1845 {
1846         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1847
1848         atomic_inc(&tpg->tpg_port_count);
1849         smp_mb__after_atomic_inc();
1850         return 0;
1851 }
1852
1853 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1854                 struct se_lun *se_lun)
1855 {
1856         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1857
1858         atomic_dec(&tpg->tpg_port_count);
1859         smp_mb__after_atomic_dec();
1860 }
1861
1862 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1863 {
1864         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1865                         se_cmd);
1866
1867         kref_put(&cmd->ref, usbg_cmd_release);
1868         return 1;
1869 }
1870
1871 static struct target_core_fabric_ops usbg_ops = {
1872         .get_fabric_name                = usbg_get_fabric_name,
1873         .get_fabric_proto_ident         = usbg_get_fabric_proto_ident,
1874         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1875         .tpg_get_tag                    = usbg_get_tag,
1876         .tpg_get_default_depth          = usbg_get_default_depth,
1877         .tpg_get_pr_transport_id        = usbg_get_pr_transport_id,
1878         .tpg_get_pr_transport_id_len    = usbg_get_pr_transport_id_len,
1879         .tpg_parse_pr_out_transport_id  = usbg_parse_pr_out_transport_id,
1880         .tpg_check_demo_mode            = usbg_check_true,
1881         .tpg_check_demo_mode_cache      = usbg_check_false,
1882         .tpg_check_demo_mode_write_protect = usbg_check_false,
1883         .tpg_check_prod_mode_write_protect = usbg_check_false,
1884         .tpg_alloc_fabric_acl           = usbg_alloc_fabric_acl,
1885         .tpg_release_fabric_acl         = usbg_release_fabric_acl,
1886         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1887         .release_cmd                    = usbg_release_cmd,
1888         .shutdown_session               = usbg_shutdown_session,
1889         .close_session                  = usbg_close_session,
1890         .sess_get_index                 = usbg_sess_get_index,
1891         .sess_get_initiator_sid         = NULL,
1892         .write_pending                  = usbg_send_write_request,
1893         .write_pending_status           = usbg_write_pending_status,
1894         .set_default_node_attributes    = usbg_set_default_node_attrs,
1895         .get_task_tag                   = usbg_get_task_tag,
1896         .get_cmd_state                  = usbg_get_cmd_state,
1897         .queue_data_in                  = usbg_send_read_response,
1898         .queue_status                   = usbg_send_status_response,
1899         .queue_tm_rsp                   = usbg_queue_tm_rsp,
1900         .check_stop_free                = usbg_check_stop_free,
1901
1902         .fabric_make_wwn                = usbg_make_tport,
1903         .fabric_drop_wwn                = usbg_drop_tport,
1904         .fabric_make_tpg                = usbg_make_tpg,
1905         .fabric_drop_tpg                = usbg_drop_tpg,
1906         .fabric_post_link               = usbg_port_link,
1907         .fabric_pre_unlink              = usbg_port_unlink,
1908         .fabric_make_np                 = NULL,
1909         .fabric_drop_np                 = NULL,
1910         .fabric_make_nodeacl            = usbg_make_nodeacl,
1911         .fabric_drop_nodeacl            = usbg_drop_nodeacl,
1912 };
1913
1914 static int usbg_register_configfs(void)
1915 {
1916         struct target_fabric_configfs *fabric;
1917         int ret;
1918
1919         fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
1920         if (IS_ERR(fabric)) {
1921                 printk(KERN_ERR "target_fabric_configfs_init() failed\n");
1922                 return PTR_ERR(fabric);
1923         }
1924
1925         fabric->tf_ops = usbg_ops;
1926         fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
1927         fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
1928         fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
1929         fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
1930         fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
1931         fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1932         fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1933         fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1934         fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1935         ret = target_fabric_configfs_register(fabric);
1936         if (ret < 0) {
1937                 printk(KERN_ERR "target_fabric_configfs_register() failed"
1938                                 " for usb-gadget\n");
1939                 return ret;
1940         }
1941         usbg_fabric_configfs = fabric;
1942         return 0;
1943 };
1944
1945 static void usbg_deregister_configfs(void)
1946 {
1947         if (!(usbg_fabric_configfs))
1948                 return;
1949
1950         target_fabric_configfs_deregister(usbg_fabric_configfs);
1951         usbg_fabric_configfs = NULL;
1952 };
1953
1954 /* Start gadget.c code */
1955
1956 static struct usb_interface_descriptor bot_intf_desc = {
1957         .bLength =              sizeof(bot_intf_desc),
1958         .bDescriptorType =      USB_DT_INTERFACE,
1959         .bNumEndpoints =        2,
1960         .bAlternateSetting =    USB_G_ALT_INT_BBB,
1961         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1962         .bInterfaceSubClass =   USB_SC_SCSI,
1963         .bInterfaceProtocol =   USB_PR_BULK,
1964 };
1965
1966 static struct usb_interface_descriptor uasp_intf_desc = {
1967         .bLength =              sizeof(uasp_intf_desc),
1968         .bDescriptorType =      USB_DT_INTERFACE,
1969         .bNumEndpoints =        4,
1970         .bAlternateSetting =    USB_G_ALT_INT_UAS,
1971         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1972         .bInterfaceSubClass =   USB_SC_SCSI,
1973         .bInterfaceProtocol =   USB_PR_UAS,
1974 };
1975
1976 static struct usb_endpoint_descriptor uasp_bi_desc = {
1977         .bLength =              USB_DT_ENDPOINT_SIZE,
1978         .bDescriptorType =      USB_DT_ENDPOINT,
1979         .bEndpointAddress =     USB_DIR_IN,
1980         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1981         .wMaxPacketSize =       cpu_to_le16(512),
1982 };
1983
1984 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1985         .bLength =              USB_DT_ENDPOINT_SIZE,
1986         .bDescriptorType =      USB_DT_ENDPOINT,
1987         .bEndpointAddress =     USB_DIR_IN,
1988         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
1989 };
1990
1991 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1992         .bLength =              sizeof(uasp_bi_pipe_desc),
1993         .bDescriptorType =      USB_DT_PIPE_USAGE,
1994         .bPipeID =              DATA_IN_PIPE_ID,
1995 };
1996
1997 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
1998         .bLength =              USB_DT_ENDPOINT_SIZE,
1999         .bDescriptorType =      USB_DT_ENDPOINT,
2000         .bEndpointAddress =     USB_DIR_IN,
2001         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2002         .wMaxPacketSize =       cpu_to_le16(1024),
2003 };
2004
2005 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
2006         .bLength =              sizeof(uasp_bi_ep_comp_desc),
2007         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2008         .bMaxBurst =            0,
2009         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2010         .wBytesPerInterval =    0,
2011 };
2012
2013 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
2014         .bLength =              sizeof(bot_bi_ep_comp_desc),
2015         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2016         .bMaxBurst =            0,
2017 };
2018
2019 static struct usb_endpoint_descriptor uasp_bo_desc = {
2020         .bLength =              USB_DT_ENDPOINT_SIZE,
2021         .bDescriptorType =      USB_DT_ENDPOINT,
2022         .bEndpointAddress =     USB_DIR_OUT,
2023         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2024         .wMaxPacketSize =       cpu_to_le16(512),
2025 };
2026
2027 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
2028         .bLength =              USB_DT_ENDPOINT_SIZE,
2029         .bDescriptorType =      USB_DT_ENDPOINT,
2030         .bEndpointAddress =     USB_DIR_OUT,
2031         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2032 };
2033
2034 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
2035         .bLength =              sizeof(uasp_bo_pipe_desc),
2036         .bDescriptorType =      USB_DT_PIPE_USAGE,
2037         .bPipeID =              DATA_OUT_PIPE_ID,
2038 };
2039
2040 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
2041         .bLength =              USB_DT_ENDPOINT_SIZE,
2042         .bDescriptorType =      USB_DT_ENDPOINT,
2043         .bEndpointAddress =     USB_DIR_OUT,
2044         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2045         .wMaxPacketSize =       cpu_to_le16(0x400),
2046 };
2047
2048 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
2049         .bLength =              sizeof(uasp_bo_ep_comp_desc),
2050         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2051         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2052 };
2053
2054 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
2055         .bLength =              sizeof(bot_bo_ep_comp_desc),
2056         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2057 };
2058
2059 static struct usb_endpoint_descriptor uasp_status_desc = {
2060         .bLength =              USB_DT_ENDPOINT_SIZE,
2061         .bDescriptorType =      USB_DT_ENDPOINT,
2062         .bEndpointAddress =     USB_DIR_IN,
2063         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2064         .wMaxPacketSize =       cpu_to_le16(512),
2065 };
2066
2067 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2068         .bLength =              USB_DT_ENDPOINT_SIZE,
2069         .bDescriptorType =      USB_DT_ENDPOINT,
2070         .bEndpointAddress =     USB_DIR_IN,
2071         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2072 };
2073
2074 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2075         .bLength =              sizeof(uasp_status_pipe_desc),
2076         .bDescriptorType =      USB_DT_PIPE_USAGE,
2077         .bPipeID =              STATUS_PIPE_ID,
2078 };
2079
2080 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
2081         .bLength =              USB_DT_ENDPOINT_SIZE,
2082         .bDescriptorType =      USB_DT_ENDPOINT,
2083         .bEndpointAddress =     USB_DIR_IN,
2084         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2085         .wMaxPacketSize =       cpu_to_le16(1024),
2086 };
2087
2088 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2089         .bLength =              sizeof(uasp_status_in_ep_comp_desc),
2090         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2091         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2092 };
2093
2094 static struct usb_endpoint_descriptor uasp_cmd_desc = {
2095         .bLength =              USB_DT_ENDPOINT_SIZE,
2096         .bDescriptorType =      USB_DT_ENDPOINT,
2097         .bEndpointAddress =     USB_DIR_OUT,
2098         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2099         .wMaxPacketSize =       cpu_to_le16(512),
2100 };
2101
2102 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2103         .bLength =              USB_DT_ENDPOINT_SIZE,
2104         .bDescriptorType =      USB_DT_ENDPOINT,
2105         .bEndpointAddress =     USB_DIR_OUT,
2106         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2107 };
2108
2109 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2110         .bLength =              sizeof(uasp_cmd_pipe_desc),
2111         .bDescriptorType =      USB_DT_PIPE_USAGE,
2112         .bPipeID =              CMD_PIPE_ID,
2113 };
2114
2115 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
2116         .bLength =              USB_DT_ENDPOINT_SIZE,
2117         .bDescriptorType =      USB_DT_ENDPOINT,
2118         .bEndpointAddress =     USB_DIR_OUT,
2119         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2120         .wMaxPacketSize =       cpu_to_le16(1024),
2121 };
2122
2123 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2124         .bLength =              sizeof(uasp_cmd_comp_desc),
2125         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2126 };
2127
2128 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2129         (struct usb_descriptor_header *) &bot_intf_desc,
2130         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2131         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2132
2133         (struct usb_descriptor_header *) &uasp_intf_desc,
2134         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2135         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2136         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2137         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2138         (struct usb_descriptor_header *) &uasp_fs_status_desc,
2139         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2140         (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2141         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2142         NULL,
2143 };
2144
2145 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2146         (struct usb_descriptor_header *) &bot_intf_desc,
2147         (struct usb_descriptor_header *) &uasp_bi_desc,
2148         (struct usb_descriptor_header *) &uasp_bo_desc,
2149
2150         (struct usb_descriptor_header *) &uasp_intf_desc,
2151         (struct usb_descriptor_header *) &uasp_bi_desc,
2152         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2153         (struct usb_descriptor_header *) &uasp_bo_desc,
2154         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2155         (struct usb_descriptor_header *) &uasp_status_desc,
2156         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2157         (struct usb_descriptor_header *) &uasp_cmd_desc,
2158         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2159         NULL,
2160 };
2161
2162 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2163         (struct usb_descriptor_header *) &bot_intf_desc,
2164         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2165         (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2166         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2167         (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2168
2169         (struct usb_descriptor_header *) &uasp_intf_desc,
2170         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2171         (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2172         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2173         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2174         (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2175         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2176         (struct usb_descriptor_header *) &uasp_ss_status_desc,
2177         (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2178         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2179         (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2180         (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2181         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2182         NULL,
2183 };
2184
2185 #define UAS_VENDOR_ID   0x0525  /* NetChip */
2186 #define UAS_PRODUCT_ID  0xa4a5  /* Linux-USB File-backed Storage Gadget */
2187
2188 static struct usb_device_descriptor usbg_device_desc = {
2189         .bLength =              sizeof(usbg_device_desc),
2190         .bDescriptorType =      USB_DT_DEVICE,
2191         .bcdUSB =               cpu_to_le16(0x0200),
2192         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
2193         .idVendor =             cpu_to_le16(UAS_VENDOR_ID),
2194         .idProduct =            cpu_to_le16(UAS_PRODUCT_ID),
2195         .bNumConfigurations =   1,
2196 };
2197
2198 static struct usb_string        usbg_us_strings[] = {
2199         [USB_GADGET_MANUFACTURER_IDX].s = "Target Manufactor",
2200         [USB_GADGET_PRODUCT_IDX].s      = "Target Product",
2201         [USB_GADGET_SERIAL_IDX].s       = "000000000001",
2202         [USB_G_STR_CONFIG].s            = "default config",
2203         [USB_G_STR_INT_UAS].s           = "USB Attached SCSI",
2204         [USB_G_STR_INT_BBB].s           = "Bulk Only Transport",
2205         { },
2206 };
2207
2208 static struct usb_gadget_strings usbg_stringtab = {
2209         .language = 0x0409,
2210         .strings = usbg_us_strings,
2211 };
2212
2213 static struct usb_gadget_strings *usbg_strings[] = {
2214         &usbg_stringtab,
2215         NULL,
2216 };
2217
2218 static int guas_unbind(struct usb_composite_dev *cdev)
2219 {
2220         return 0;
2221 }
2222
2223 static struct usb_configuration usbg_config_driver = {
2224         .label                  = "Linux Target",
2225         .bConfigurationValue    = 1,
2226         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
2227 };
2228
2229 static void give_back_ep(struct usb_ep **pep)
2230 {
2231         struct usb_ep *ep = *pep;
2232         if (!ep)
2233                 return;
2234         ep->driver_data = NULL;
2235 }
2236
2237 static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2238 {
2239         struct f_uas            *fu = to_f_uas(f);
2240         struct usb_gadget       *gadget = c->cdev->gadget;
2241         struct usb_ep           *ep;
2242         int                     iface;
2243         int                     ret;
2244
2245         iface = usb_interface_id(c, f);
2246         if (iface < 0)
2247                 return iface;
2248
2249         bot_intf_desc.bInterfaceNumber = iface;
2250         uasp_intf_desc.bInterfaceNumber = iface;
2251         fu->iface = iface;
2252         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2253                         &uasp_bi_ep_comp_desc);
2254         if (!ep)
2255                 goto ep_fail;
2256
2257         ep->driver_data = fu;
2258         fu->ep_in = ep;
2259
2260         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2261                         &uasp_bo_ep_comp_desc);
2262         if (!ep)
2263                 goto ep_fail;
2264         ep->driver_data = fu;
2265         fu->ep_out = ep;
2266
2267         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2268                         &uasp_status_in_ep_comp_desc);
2269         if (!ep)
2270                 goto ep_fail;
2271         ep->driver_data = fu;
2272         fu->ep_status = ep;
2273
2274         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2275                         &uasp_cmd_comp_desc);
2276         if (!ep)
2277                 goto ep_fail;
2278         ep->driver_data = fu;
2279         fu->ep_cmd = ep;
2280
2281         /* Assume endpoint addresses are the same for both speeds */
2282         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2283         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2284         uasp_status_desc.bEndpointAddress =
2285                 uasp_ss_status_desc.bEndpointAddress;
2286         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2287
2288         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2289         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2290         uasp_fs_status_desc.bEndpointAddress =
2291                 uasp_ss_status_desc.bEndpointAddress;
2292         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2293
2294         ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2295                         uasp_hs_function_desc, uasp_ss_function_desc);
2296         if (ret)
2297                 goto ep_fail;
2298
2299         return 0;
2300 ep_fail:
2301         pr_err("Can't claim all required eps\n");
2302
2303         give_back_ep(&fu->ep_in);
2304         give_back_ep(&fu->ep_out);
2305         give_back_ep(&fu->ep_status);
2306         give_back_ep(&fu->ep_cmd);
2307         return -ENOTSUPP;
2308 }
2309
2310 static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2311 {
2312         struct f_uas *fu = to_f_uas(f);
2313
2314         usb_free_all_descriptors(f);
2315         kfree(fu);
2316 }
2317
2318 struct guas_setup_wq {
2319         struct work_struct work;
2320         struct f_uas *fu;
2321         unsigned int alt;
2322 };
2323
2324 static void usbg_delayed_set_alt(struct work_struct *wq)
2325 {
2326         struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2327                         work);
2328         struct f_uas *fu = work->fu;
2329         int alt = work->alt;
2330
2331         kfree(work);
2332
2333         if (fu->flags & USBG_IS_BOT)
2334                 bot_cleanup_old_alt(fu);
2335         if (fu->flags & USBG_IS_UAS)
2336                 uasp_cleanup_old_alt(fu);
2337
2338         if (alt == USB_G_ALT_INT_BBB)
2339                 bot_set_alt(fu);
2340         else if (alt == USB_G_ALT_INT_UAS)
2341                 uasp_set_alt(fu);
2342         usb_composite_setup_continue(fu->function.config->cdev);
2343 }
2344
2345 static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2346 {
2347         struct f_uas *fu = to_f_uas(f);
2348
2349         if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2350                 struct guas_setup_wq *work;
2351
2352                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2353                 if (!work)
2354                         return -ENOMEM;
2355                 INIT_WORK(&work->work, usbg_delayed_set_alt);
2356                 work->fu = fu;
2357                 work->alt = alt;
2358                 schedule_work(&work->work);
2359                 return USB_GADGET_DELAYED_STATUS;
2360         }
2361         return -EOPNOTSUPP;
2362 }
2363
2364 static void usbg_disable(struct usb_function *f)
2365 {
2366         struct f_uas *fu = to_f_uas(f);
2367
2368         if (fu->flags & USBG_IS_UAS)
2369                 uasp_cleanup_old_alt(fu);
2370         else if (fu->flags & USBG_IS_BOT)
2371                 bot_cleanup_old_alt(fu);
2372         fu->flags = 0;
2373 }
2374
2375 static int usbg_setup(struct usb_function *f,
2376                 const struct usb_ctrlrequest *ctrl)
2377 {
2378         struct f_uas *fu = to_f_uas(f);
2379
2380         if (!(fu->flags & USBG_IS_BOT))
2381                 return -EOPNOTSUPP;
2382
2383         return usbg_bot_setup(f, ctrl);
2384 }
2385
2386 static int usbg_cfg_bind(struct usb_configuration *c)
2387 {
2388         struct f_uas *fu;
2389         int ret;
2390
2391         fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2392         if (!fu)
2393                 return -ENOMEM;
2394         fu->function.name = "Target Function";
2395         fu->function.bind = usbg_bind;
2396         fu->function.unbind = usbg_unbind;
2397         fu->function.set_alt = usbg_set_alt;
2398         fu->function.setup = usbg_setup;
2399         fu->function.disable = usbg_disable;
2400         fu->tpg = the_only_tpg_I_currently_have;
2401
2402         bot_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_BBB].id;
2403         uasp_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_UAS].id;
2404
2405         ret = usb_add_function(c, &fu->function);
2406         if (ret)
2407                 goto err;
2408
2409         return 0;
2410 err:
2411         kfree(fu);
2412         return ret;
2413 }
2414
2415 static int usb_target_bind(struct usb_composite_dev *cdev)
2416 {
2417         int ret;
2418
2419         ret = usb_string_ids_tab(cdev, usbg_us_strings);
2420         if (ret)
2421                 return ret;
2422
2423         usbg_device_desc.iManufacturer =
2424                 usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
2425         usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
2426         usbg_device_desc.iSerialNumber =
2427                 usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
2428         usbg_config_driver.iConfiguration =
2429                 usbg_us_strings[USB_G_STR_CONFIG].id;
2430
2431         ret = usb_add_config(cdev, &usbg_config_driver,
2432                         usbg_cfg_bind);
2433         if (ret)
2434                 return ret;
2435         usb_composite_overwrite_options(cdev, &coverwrite);
2436         return 0;
2437 }
2438
2439 static __refdata struct usb_composite_driver usbg_driver = {
2440         .name           = "g_target",
2441         .dev            = &usbg_device_desc,
2442         .strings        = usbg_strings,
2443         .max_speed      = USB_SPEED_SUPER,
2444         .bind           = usb_target_bind,
2445         .unbind         = guas_unbind,
2446 };
2447
2448 static int usbg_attach(struct usbg_tpg *tpg)
2449 {
2450         return usb_composite_probe(&usbg_driver);
2451 }
2452
2453 static void usbg_detach(struct usbg_tpg *tpg)
2454 {
2455         usb_composite_unregister(&usbg_driver);
2456 }
2457
2458 static int __init usb_target_gadget_init(void)
2459 {
2460         int ret;
2461
2462         ret = usbg_register_configfs();
2463         return ret;
2464 }
2465 module_init(usb_target_gadget_init);
2466
2467 static void __exit usb_target_gadget_exit(void)
2468 {
2469         usbg_deregister_configfs();
2470 }
2471 module_exit(usb_target_gadget_exit);
2472
2473 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2474 MODULE_DESCRIPTION("usb-gadget fabric");
2475 MODULE_LICENSE("GPL v2");