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 "usbstring.c"
  29 #include "epautoconf.c"
  30 #include "config.c"
  31 #include "composite.c"
  32
  33 #include "tcm_usb_gadget.h"
  34
  35 static struct target_fabric_configfs *usbg_fabric_configfs;
  36
  37 static inline struct f_uas *to_f_uas(struct usb_function *f)
  38 {
  39         return container_of(f, struct f_uas, function);
  40 }
  41
  42 static void usbg_cmd_release(struct kref *);
  43
  44 static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
  45 {
  46         kref_put(&cmd->ref, usbg_cmd_release);
  47 }
  48
  49 /* Start bot.c code */
  50
  51 static int bot_enqueue_cmd_cbw(struct f_uas *fu)
  52 {
  53         int ret;
  54
  55         if (fu->flags & USBG_BOT_CMD_PEND)
  56                 return 0;
  57
  58         ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
  59         if (!ret)
  60                 fu->flags |= USBG_BOT_CMD_PEND;
  61         return ret;
  62 }
  63
  64 static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
  65 {
  66         struct usbg_cmd *cmd = req->context;
  67         struct f_uas *fu = cmd->fu;
  68
  69         usbg_cleanup_cmd(cmd);
  70         if (req->status < 0) {
  71                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
  72                 return;
  73         }
  74
  75         /* CSW completed, wait for next CBW */
  76         bot_enqueue_cmd_cbw(fu);
  77 }
  78
  79 static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
  80 {
  81         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
  82         int ret;
  83         u8 *sense;
  84         unsigned int csw_stat;
  85
  86         csw_stat = cmd->csw_code;
  87
  88         /*
  89          * We can't send SENSE as a response. So we take ASC & ASCQ from our
  90          * sense buffer and queue it and hope the host sends a REQUEST_SENSE
  91          * command where it learns why we failed.
  92          */
  93         sense = cmd->sense_iu.sense;
  94
  95         csw->Tag = cmd->bot_tag;
  96         csw->Status = csw_stat;
  97         fu->bot_status.req->context = cmd;
  98         ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
  99         if (ret)
 100                 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
 101 }
 102
 103 static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
 104 {
 105         struct usbg_cmd *cmd = req->context;
 106         struct f_uas *fu = cmd->fu;
 107
 108         if (req->status < 0)
 109                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
 110
 111         if (cmd->data_len) {
 112                 if (cmd->data_len > ep->maxpacket) {
 113                         req->length = ep->maxpacket;
 114                         cmd->data_len -= ep->maxpacket;
 115                 } else {
 116                         req->length = cmd->data_len;
 117                         cmd->data_len = 0;
 118                 }
 119
 120                 usb_ep_queue(ep, req, GFP_ATOMIC);
 121                 return ;
 122         }
 123         bot_enqueue_sense_code(fu, cmd);
 124 }
 125
 126 static void bot_send_bad_status(struct usbg_cmd *cmd)
 127 {
 128         struct f_uas *fu = cmd->fu;
 129         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
 130         struct usb_request *req;
 131         struct usb_ep *ep;
 132
 133         csw->Residue = cpu_to_le32(cmd->data_len);
 134
 135         if (cmd->data_len) {
 136                 if (cmd->is_read) {
 137                         ep = fu->ep_in;
 138                         req = fu->bot_req_in;
 139                 } else {
 140                         ep = fu->ep_out;
 141                         req = fu->bot_req_out;
 142                 }
 143
 144                 if (cmd->data_len > fu->ep_in->maxpacket) {
 145                         req->length = ep->maxpacket;
 146                         cmd->data_len -= ep->maxpacket;
 147                 } else {
 148                         req->length = cmd->data_len;
 149                         cmd->data_len = 0;
 150                 }
 151                 req->complete = bot_err_compl;
 152                 req->context = cmd;
 153                 req->buf = fu->cmd.buf;
 154                 usb_ep_queue(ep, req, GFP_KERNEL);
 155         } else {
 156                 bot_enqueue_sense_code(fu, cmd);
 157         }
 158 }
 159
 160 static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
 161 {
 162         struct f_uas *fu = cmd->fu;
 163         struct bulk_cs_wrap *csw = &fu->bot_status.csw;
 164         int ret;
 165
 166         if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
 167                 if (!moved_data && cmd->data_len) {
 168                         /*
 169                          * the host wants to move data, we don't. Fill / empty
 170                          * the pipe and then send the csw with reside set.
 171                          */
 172                         cmd->csw_code = US_BULK_STAT_OK;
 173                         bot_send_bad_status(cmd);
 174                         return 0;
 175                 }
 176
 177                 csw->Tag = cmd->bot_tag;
 178                 csw->Residue = cpu_to_le32(0);
 179                 csw->Status = US_BULK_STAT_OK;
 180                 fu->bot_status.req->context = cmd;
 181
 182                 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
 183                 if (ret)
 184                         pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
 185         } else {
 186                 cmd->csw_code = US_BULK_STAT_FAIL;
 187                 bot_send_bad_status(cmd);
 188         }
 189         return 0;
 190 }
 191
 192 /*
 193  * Called after command (no data transfer) or after the write (to device)
 194  * operation is completed
 195  */
 196 static int bot_send_status_response(struct usbg_cmd *cmd)
 197 {
 198         bool moved_data = false;
 199
 200         if (!cmd->is_read)
 201                 moved_data = true;
 202         return bot_send_status(cmd, moved_data);
 203 }
 204
 205 /* Read request completed, now we have to send the CSW */
 206 static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
 207 {
 208         struct usbg_cmd *cmd = req->context;
 209
 210         if (req->status < 0)
 211                 pr_err("ERR %s(%d)\n", __func__, __LINE__);
 212
 213         bot_send_status(cmd, true);
 214 }
 215
 216 static int bot_send_read_response(struct usbg_cmd *cmd)
 217 {
 218         struct f_uas *fu = cmd->fu;
 219         struct se_cmd *se_cmd = &cmd->se_cmd;
 220         struct usb_gadget *gadget = fuas_to_gadget(fu);
 221         int ret;
 222
 223         if (!cmd->data_len) {
 224                 cmd->csw_code = US_BULK_STAT_PHASE;
 225                 bot_send_bad_status(cmd);
 226                 return 0;
 227         }
 228
 229         if (!gadget->sg_supported) {
 230                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 231                 if (!cmd->data_buf)
 232                         return -ENOMEM;
 233
 234                 sg_copy_to_buffer(se_cmd->t_data_sg,
 235                                 se_cmd->t_data_nents,
 236                                 cmd->data_buf,
 237                                 se_cmd->data_length);
 238
 239                 fu->bot_req_in->buf = cmd->data_buf;
 240         } else {
 241                 fu->bot_req_in->buf = NULL;
 242                 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
 243                 fu->bot_req_in->sg = se_cmd->t_data_sg;
 244         }
 245
 246         fu->bot_req_in->complete = bot_read_compl;
 247         fu->bot_req_in->length = se_cmd->data_length;
 248         fu->bot_req_in->context = cmd;
 249         ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
 250         if (ret)
 251                 pr_err("%s(%d)\n", __func__, __LINE__);
 252         return 0;
 253 }
 254
 255 static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
 256 static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
 257
 258 static int bot_send_write_request(struct usbg_cmd *cmd)
 259 {
 260         struct f_uas *fu = cmd->fu;
 261         struct se_cmd *se_cmd = &cmd->se_cmd;
 262         struct usb_gadget *gadget = fuas_to_gadget(fu);
 263         int ret;
 264
 265         init_completion(&cmd->write_complete);
 266         cmd->fu = fu;
 267
 268         if (!cmd->data_len) {
 269                 cmd->csw_code = US_BULK_STAT_PHASE;
 270                 return -EINVAL;
 271         }
 272
 273         if (!gadget->sg_supported) {
 274                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
 275                 if (!cmd->data_buf)
 276                         return -ENOMEM;
 277
 278                 fu->bot_req_out->buf = cmd->data_buf;
 279         } else {
 280                 fu->bot_req_out->buf = NULL;
 281                 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
 282                 fu->bot_req_out->sg = se_cmd->t_data_sg;
 283         }
 284
 285         fu->bot_req_out->complete = usbg_data_write_cmpl;
 286         fu->bot_req_out->length = se_cmd->data_length;
 287         fu->bot_req_out->context = cmd;
 288
 289         ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
 290         if (ret)
 291                 goto cleanup;
 292         ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
 293         if (ret)
 294                 pr_err("%s(%d)\n", __func__, __LINE__);
 295
 296         wait_for_completion(&cmd->write_complete);
 297         transport_generic_process_write(se_cmd);
 298 cleanup:
 299         return ret;
 300 }
 301
 302 static int bot_submit_command(struct f_uas *, void *, unsigned int);
 303
 304 static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
 305 {
 306         struct f_uas *fu = req->context;
 307         int ret;
 308
 309         fu->flags &= ~USBG_BOT_CMD_PEND;
 310
 311         if (req->status < 0)
 312                 return;
 313
 314         ret = bot_submit_command(fu, req->buf, req->actual);
 315         if (ret)
 316                 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
 317 }
 318
 319 static int bot_prepare_reqs(struct f_uas *fu)
 320 {
 321         int ret;
 322
 323         fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 324         if (!fu->bot_req_in)
 325                 goto err;
 326
 327         fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 328         if (!fu->bot_req_out)
 329                 goto err_out;
 330
 331         fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 332         if (!fu->cmd.req)
 333                 goto err_cmd;
 334
 335         fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 336         if (!fu->bot_status.req)
 337                 goto err_sts;
 338
 339         fu->bot_status.req->buf = &fu->bot_status.csw;
 340         fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
 341         fu->bot_status.req->complete = bot_status_complete;
 342         fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
 343
 344         fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
 345         if (!fu->cmd.buf)
 346                 goto err_buf;
 347
 348         fu->cmd.req->complete = bot_cmd_complete;
 349         fu->cmd.req->buf = fu->cmd.buf;
 350         fu->cmd.req->length = fu->ep_out->maxpacket;
 351         fu->cmd.req->context = fu;
 352
 353         ret = bot_enqueue_cmd_cbw(fu);
 354         if (ret)
 355                 goto err_queue;
 356         return 0;
 357 err_queue:
 358         kfree(fu->cmd.buf);
 359         fu->cmd.buf = NULL;
 360 err_buf:
 361         usb_ep_free_request(fu->ep_in, fu->bot_status.req);
 362 err_sts:
 363         usb_ep_free_request(fu->ep_out, fu->cmd.req);
 364         fu->cmd.req = NULL;
 365 err_cmd:
 366         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
 367         fu->bot_req_out = NULL;
 368 err_out:
 369         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
 370         fu->bot_req_in = NULL;
 371 err:
 372         pr_err("BOT: endpoint setup failed\n");
 373         return -ENOMEM;
 374 }
 375
 376 void bot_cleanup_old_alt(struct f_uas *fu)
 377 {
 378         if (!(fu->flags & USBG_ENABLED))
 379                 return;
 380
 381         usb_ep_disable(fu->ep_in);
 382         usb_ep_disable(fu->ep_out);
 383
 384         if (!fu->bot_req_in)
 385                 return;
 386
 387         usb_ep_free_request(fu->ep_in, fu->bot_req_in);
 388         usb_ep_free_request(fu->ep_out, fu->bot_req_out);
 389         usb_ep_free_request(fu->ep_out, fu->cmd.req);
 390         usb_ep_free_request(fu->ep_out, fu->bot_status.req);
 391
 392         kfree(fu->cmd.buf);
 393
 394         fu->bot_req_in = NULL;
 395         fu->bot_req_out = NULL;
 396         fu->cmd.req = NULL;
 397         fu->bot_status.req = NULL;
 398         fu->cmd.buf = NULL;
 399 }
 400
 401 static void bot_set_alt(struct f_uas *fu)
 402 {
 403         struct usb_function *f = &fu->function;
 404         struct usb_gadget *gadget = f->config->cdev->gadget;
 405         int ret;
 406
 407         fu->flags = USBG_IS_BOT;
 408
 409         config_ep_by_speed(gadget, f, fu->ep_in);
 410         ret = usb_ep_enable(fu->ep_in);
 411         if (ret)
 412                 goto err_b_in;
 413
 414         config_ep_by_speed(gadget, f, fu->ep_out);
 415         ret = usb_ep_enable(fu->ep_out);
 416         if (ret)
 417                 goto err_b_out;
 418
 419         ret = bot_prepare_reqs(fu);
 420         if (ret)
 421                 goto err_wq;
 422         fu->flags |= USBG_ENABLED;
 423         pr_info("Using the BOT protocol\n");
 424         return;
 425 err_wq:
 426         usb_ep_disable(fu->ep_out);
 427 err_b_out:
 428         usb_ep_disable(fu->ep_in);
 429 err_b_in:
 430         fu->flags = USBG_IS_BOT;
 431 }
 432
 433 static int usbg_bot_setup(struct usb_function *f,
 434                 const struct usb_ctrlrequest *ctrl)
 435 {
 436         struct f_uas *fu = to_f_uas(f);
 437         struct usb_composite_dev *cdev = f->config->cdev;
 438         u16 w_value = le16_to_cpu(ctrl->wValue);
 439         u16 w_length = le16_to_cpu(ctrl->wLength);
 440         int luns;
 441         u8 *ret_lun;
 442
 443         switch (ctrl->bRequest) {
 444         case US_BULK_GET_MAX_LUN:
 445                 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
 446                                         USB_RECIP_INTERFACE))
 447                         return -ENOTSUPP;
 448
 449                 if (w_length < 1)
 450                         return -EINVAL;
 451                 if (w_value != 0)
 452                         return -EINVAL;
 453                 luns = atomic_read(&fu->tpg->tpg_port_count);
 454                 if (!luns) {
 455                         pr_err("No LUNs configured?\n");
 456                         return -EINVAL;
 457                 }
 458                 /*
 459                  * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
 460                  * accessed. The upper limit is 0xf
 461                  */
 462                 luns--;
 463                 if (luns > 0xf) {
 464                         pr_info_once("Limiting the number of luns to 16\n");
 465                         luns = 0xf;
 466                 }
 467                 ret_lun = cdev->req->buf;
 468                 *ret_lun = luns;
 469                 cdev->req->length = 1;
 470                 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
 471                 break;
 472
 473         case US_BULK_RESET_REQUEST:
 474                 /* XXX maybe we should remove previous requests for IN + OUT */
 475                 bot_enqueue_cmd_cbw(fu);
 476                 return 0;
 477                 break;
 478         };
 479         return -ENOTSUPP;
 480 }
 481
 482 /* Start uas.c code */
 483
 484 static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
 485 {
 486         /* We have either all three allocated or none */
 487         if (!stream->req_in)
 488                 return;
 489
 490         usb_ep_free_request(fu->ep_in, stream->req_in);
 491         usb_ep_free_request(fu->ep_out, stream->req_out);
 492         usb_ep_free_request(fu->ep_status, stream->req_status);
 493
 494         stream->req_in = NULL;
 495         stream->req_out = NULL;
 496         stream->req_status = NULL;
 497 }
 498
 499 static void uasp_free_cmdreq(struct f_uas *fu)
 500 {
 501         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 502         kfree(fu->cmd.buf);
 503         fu->cmd.req = NULL;
 504         fu->cmd.buf = NULL;
 505 }
 506
 507 static void uasp_cleanup_old_alt(struct f_uas *fu)
 508 {
 509         int i;
 510
 511         if (!(fu->flags & USBG_ENABLED))
 512                 return;
 513
 514         usb_ep_disable(fu->ep_in);
 515         usb_ep_disable(fu->ep_out);
 516         usb_ep_disable(fu->ep_status);
 517         usb_ep_disable(fu->ep_cmd);
 518
 519         for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
 520                 uasp_cleanup_one_stream(fu, &fu->stream[i]);
 521         uasp_free_cmdreq(fu);
 522 }
 523
 524 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
 525
 526 static int uasp_prepare_r_request(struct usbg_cmd *cmd)
 527 {
 528         struct se_cmd *se_cmd = &cmd->se_cmd;
 529         struct f_uas *fu = cmd->fu;
 530         struct usb_gadget *gadget = fuas_to_gadget(fu);
 531         struct uas_stream *stream = cmd->stream;
 532
 533         if (!gadget->sg_supported) {
 534                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 535                 if (!cmd->data_buf)
 536                         return -ENOMEM;
 537
 538                 sg_copy_to_buffer(se_cmd->t_data_sg,
 539                                 se_cmd->t_data_nents,
 540                                 cmd->data_buf,
 541                                 se_cmd->data_length);
 542
 543                 stream->req_in->buf = cmd->data_buf;
 544         } else {
 545                 stream->req_in->buf = NULL;
 546                 stream->req_in->num_sgs = se_cmd->t_data_nents;
 547                 stream->req_in->sg = se_cmd->t_data_sg;
 548         }
 549
 550         stream->req_in->complete = uasp_status_data_cmpl;
 551         stream->req_in->length = se_cmd->data_length;
 552         stream->req_in->context = cmd;
 553
 554         cmd->state = UASP_SEND_STATUS;
 555         return 0;
 556 }
 557
 558 static void uasp_prepare_status(struct usbg_cmd *cmd)
 559 {
 560         struct se_cmd *se_cmd = &cmd->se_cmd;
 561         struct sense_iu *iu = &cmd->sense_iu;
 562         struct uas_stream *stream = cmd->stream;
 563
 564         cmd->state = UASP_QUEUE_COMMAND;
 565         iu->iu_id = IU_ID_STATUS;
 566         iu->tag = cpu_to_be16(cmd->tag);
 567
 568         /*
 569          * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
 570          */
 571         iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
 572         iu->status = se_cmd->scsi_status;
 573         stream->req_status->context = cmd;
 574         stream->req_status->length = se_cmd->scsi_sense_length + 16;
 575         stream->req_status->buf = iu;
 576         stream->req_status->complete = uasp_status_data_cmpl;
 577 }
 578
 579 static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
 580 {
 581         struct usbg_cmd *cmd = req->context;
 582         struct uas_stream *stream = cmd->stream;
 583         struct f_uas *fu = cmd->fu;
 584         int ret;
 585
 586         if (req->status < 0)
 587                 goto cleanup;
 588
 589         switch (cmd->state) {
 590         case UASP_SEND_DATA:
 591                 ret = uasp_prepare_r_request(cmd);
 592                 if (ret)
 593                         goto cleanup;
 594                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 595                 if (ret)
 596                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 597                 break;
 598
 599         case UASP_RECEIVE_DATA:
 600                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 601                 if (ret)
 602                         goto cleanup;
 603                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 604                 if (ret)
 605                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 606                 break;
 607
 608         case UASP_SEND_STATUS:
 609                 uasp_prepare_status(cmd);
 610                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 611                                 GFP_ATOMIC);
 612                 if (ret)
 613                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 614                 break;
 615
 616         case UASP_QUEUE_COMMAND:
 617                 usbg_cleanup_cmd(cmd);
 618                 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 619                 break;
 620
 621         default:
 622                 BUG();
 623         };
 624         return;
 625
 626 cleanup:
 627         usbg_cleanup_cmd(cmd);
 628 }
 629
 630 static int uasp_send_status_response(struct usbg_cmd *cmd)
 631 {
 632         struct f_uas *fu = cmd->fu;
 633         struct uas_stream *stream = cmd->stream;
 634         struct sense_iu *iu = &cmd->sense_iu;
 635
 636         iu->tag = cpu_to_be16(cmd->tag);
 637         stream->req_status->complete = uasp_status_data_cmpl;
 638         stream->req_status->context = cmd;
 639         cmd->fu = fu;
 640         uasp_prepare_status(cmd);
 641         return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
 642 }
 643
 644 static int uasp_send_read_response(struct usbg_cmd *cmd)
 645 {
 646         struct f_uas *fu = cmd->fu;
 647         struct uas_stream *stream = cmd->stream;
 648         struct sense_iu *iu = &cmd->sense_iu;
 649         int ret;
 650
 651         cmd->fu = fu;
 652
 653         iu->tag = cpu_to_be16(cmd->tag);
 654         if (fu->flags & USBG_USE_STREAMS) {
 655
 656                 ret = uasp_prepare_r_request(cmd);
 657                 if (ret)
 658                         goto out;
 659                 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
 660                 if (ret) {
 661                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 662                         kfree(cmd->data_buf);
 663                         cmd->data_buf = NULL;
 664                 }
 665
 666         } else {
 667
 668                 iu->iu_id = IU_ID_READ_READY;
 669                 iu->tag = cpu_to_be16(cmd->tag);
 670
 671                 stream->req_status->complete = uasp_status_data_cmpl;
 672                 stream->req_status->context = cmd;
 673
 674                 cmd->state = UASP_SEND_DATA;
 675                 stream->req_status->buf = iu;
 676                 stream->req_status->length = sizeof(struct iu);
 677
 678                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 679                                 GFP_ATOMIC);
 680                 if (ret)
 681                         pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
 682         }
 683 out:
 684         return ret;
 685 }
 686
 687 static int uasp_send_write_request(struct usbg_cmd *cmd)
 688 {
 689         struct f_uas *fu = cmd->fu;
 690         struct se_cmd *se_cmd = &cmd->se_cmd;
 691         struct uas_stream *stream = cmd->stream;
 692         struct sense_iu *iu = &cmd->sense_iu;
 693         int ret;
 694
 695         init_completion(&cmd->write_complete);
 696         cmd->fu = fu;
 697
 698         iu->tag = cpu_to_be16(cmd->tag);
 699
 700         if (fu->flags & USBG_USE_STREAMS) {
 701
 702                 ret = usbg_prepare_w_request(cmd, stream->req_out);
 703                 if (ret)
 704                         goto cleanup;
 705                 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
 706                 if (ret)
 707                         pr_err("%s(%d)\n", __func__, __LINE__);
 708
 709         } else {
 710
 711                 iu->iu_id = IU_ID_WRITE_READY;
 712                 iu->tag = cpu_to_be16(cmd->tag);
 713
 714                 stream->req_status->complete = uasp_status_data_cmpl;
 715                 stream->req_status->context = cmd;
 716
 717                 cmd->state = UASP_RECEIVE_DATA;
 718                 stream->req_status->buf = iu;
 719                 stream->req_status->length = sizeof(struct iu);
 720
 721                 ret = usb_ep_queue(fu->ep_status, stream->req_status,
 722                                 GFP_ATOMIC);
 723                 if (ret)
 724                         pr_err("%s(%d)\n", __func__, __LINE__);
 725         }
 726
 727         wait_for_completion(&cmd->write_complete);
 728         transport_generic_process_write(se_cmd);
 729 cleanup:
 730         return ret;
 731 }
 732
 733 static int usbg_submit_command(struct f_uas *, void *, unsigned int);
 734
 735 static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
 736 {
 737         struct f_uas *fu = req->context;
 738         int ret;
 739
 740         if (req->status < 0)
 741                 return;
 742
 743         ret = usbg_submit_command(fu, req->buf, req->actual);
 744         /*
 745          * Once we tune for performance enqueue the command req here again so
 746          * we can receive a second command while we processing this one. Pay
 747          * attention to properly sync STAUS endpoint with DATA IN + OUT so you
 748          * don't break HS.
 749          */
 750         if (!ret)
 751                 return;
 752         usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 753 }
 754
 755 static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
 756 {
 757         stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
 758         if (!stream->req_in)
 759                 goto out;
 760
 761         stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
 762         if (!stream->req_out)
 763                 goto err_out;
 764
 765         stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
 766         if (!stream->req_status)
 767                 goto err_sts;
 768
 769         return 0;
 770 err_sts:
 771         usb_ep_free_request(fu->ep_status, stream->req_status);
 772         stream->req_status = NULL;
 773 err_out:
 774         usb_ep_free_request(fu->ep_out, stream->req_out);
 775         stream->req_out = NULL;
 776 out:
 777         return -ENOMEM;
 778 }
 779
 780 static int uasp_alloc_cmd(struct f_uas *fu)
 781 {
 782         fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
 783         if (!fu->cmd.req)
 784                 goto err;
 785
 786         fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
 787         if (!fu->cmd.buf)
 788                 goto err_buf;
 789
 790         fu->cmd.req->complete = uasp_cmd_complete;
 791         fu->cmd.req->buf = fu->cmd.buf;
 792         fu->cmd.req->length = fu->ep_cmd->maxpacket;
 793         fu->cmd.req->context = fu;
 794         return 0;
 795
 796 err_buf:
 797         usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
 798 err:
 799         return -ENOMEM;
 800 }
 801
 802 static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
 803 {
 804         int i;
 805
 806         for (i = 0; i < max_streams; i++) {
 807                 struct uas_stream *s = &fu->stream[i];
 808
 809                 s->req_in->stream_id = i + 1;
 810                 s->req_out->stream_id = i + 1;
 811                 s->req_status->stream_id = i + 1;
 812         }
 813 }
 814
 815 static int uasp_prepare_reqs(struct f_uas *fu)
 816 {
 817         int ret;
 818         int i;
 819         int max_streams;
 820
 821         if (fu->flags & USBG_USE_STREAMS)
 822                 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
 823         else
 824                 max_streams = 1;
 825
 826         for (i = 0; i < max_streams; i++) {
 827                 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
 828                 if (ret)
 829                         goto err_cleanup;
 830         }
 831
 832         ret = uasp_alloc_cmd(fu);
 833         if (ret)
 834                 goto err_free_stream;
 835         uasp_setup_stream_res(fu, max_streams);
 836
 837         ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
 838         if (ret)
 839                 goto err_free_stream;
 840
 841         return 0;
 842
 843 err_free_stream:
 844         uasp_free_cmdreq(fu);
 845
 846 err_cleanup:
 847         if (i) {
 848                 do {
 849                         uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
 850                         i--;
 851                 } while (i);
 852         }
 853         pr_err("UASP: endpoint setup failed\n");
 854         return ret;
 855 }
 856
 857 static void uasp_set_alt(struct f_uas *fu)
 858 {
 859         struct usb_function *f = &fu->function;
 860         struct usb_gadget *gadget = f->config->cdev->gadget;
 861         int ret;
 862
 863         fu->flags = USBG_IS_UAS;
 864
 865         if (gadget->speed == USB_SPEED_SUPER)
 866                 fu->flags |= USBG_USE_STREAMS;
 867
 868         config_ep_by_speed(gadget, f, fu->ep_in);
 869         ret = usb_ep_enable(fu->ep_in);
 870         if (ret)
 871                 goto err_b_in;
 872
 873         config_ep_by_speed(gadget, f, fu->ep_out);
 874         ret = usb_ep_enable(fu->ep_out);
 875         if (ret)
 876                 goto err_b_out;
 877
 878         config_ep_by_speed(gadget, f, fu->ep_cmd);
 879         ret = usb_ep_enable(fu->ep_cmd);
 880         if (ret)
 881                 goto err_cmd;
 882         config_ep_by_speed(gadget, f, fu->ep_status);
 883         ret = usb_ep_enable(fu->ep_status);
 884         if (ret)
 885                 goto err_status;
 886
 887         ret = uasp_prepare_reqs(fu);
 888         if (ret)
 889                 goto err_wq;
 890         fu->flags |= USBG_ENABLED;
 891
 892         pr_info("Using the UAS protocol\n");
 893         return;
 894 err_wq:
 895         usb_ep_disable(fu->ep_status);
 896 err_status:
 897         usb_ep_disable(fu->ep_cmd);
 898 err_cmd:
 899         usb_ep_disable(fu->ep_out);
 900 err_b_out:
 901         usb_ep_disable(fu->ep_in);
 902 err_b_in:
 903         fu->flags = 0;
 904 }
 905
 906 static int get_cmd_dir(const unsigned char *cdb)
 907 {
 908         int ret;
 909
 910         switch (cdb[0]) {
 911         case READ_6:
 912         case READ_10:
 913         case READ_12:
 914         case READ_16:
 915         case INQUIRY:
 916         case MODE_SENSE:
 917         case MODE_SENSE_10:
 918         case SERVICE_ACTION_IN:
 919         case MAINTENANCE_IN:
 920         case PERSISTENT_RESERVE_IN:
 921         case SECURITY_PROTOCOL_IN:
 922         case ACCESS_CONTROL_IN:
 923         case REPORT_LUNS:
 924         case READ_BLOCK_LIMITS:
 925         case READ_POSITION:
 926         case READ_CAPACITY:
 927         case READ_TOC:
 928         case READ_FORMAT_CAPACITIES:
 929         case REQUEST_SENSE:
 930                 ret = DMA_FROM_DEVICE;
 931                 break;
 932
 933         case WRITE_6:
 934         case WRITE_10:
 935         case WRITE_12:
 936         case WRITE_16:
 937         case MODE_SELECT:
 938         case MODE_SELECT_10:
 939         case WRITE_VERIFY:
 940         case WRITE_VERIFY_12:
 941         case PERSISTENT_RESERVE_OUT:
 942         case MAINTENANCE_OUT:
 943         case SECURITY_PROTOCOL_OUT:
 944         case ACCESS_CONTROL_OUT:
 945                 ret = DMA_TO_DEVICE;
 946                 break;
 947         case ALLOW_MEDIUM_REMOVAL:
 948         case TEST_UNIT_READY:
 949         case SYNCHRONIZE_CACHE:
 950         case START_STOP:
 951         case ERASE:
 952         case REZERO_UNIT:
 953         case SEEK_10:
 954         case SPACE:
 955         case VERIFY:
 956         case WRITE_FILEMARKS:
 957                 ret = DMA_NONE;
 958                 break;
 959         default:
 960                 pr_warn("target: Unknown data direction for SCSI Opcode "
 961                                 "0x%02x\n", cdb[0]);
 962                 ret = -EINVAL;
 963         }
 964         return ret;
 965 }
 966
 967 static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
 968 {
 969         struct usbg_cmd *cmd = req->context;
 970         struct se_cmd *se_cmd = &cmd->se_cmd;
 971
 972         if (req->status < 0) {
 973                 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
 974                 goto cleanup;
 975         }
 976
 977         if (req->num_sgs == 0) {
 978                 sg_copy_from_buffer(se_cmd->t_data_sg,
 979                                 se_cmd->t_data_nents,
 980                                 cmd->data_buf,
 981                                 se_cmd->data_length);
 982         }
 983
 984         complete(&cmd->write_complete);
 985         return;
 986
 987 cleanup:
 988         usbg_cleanup_cmd(cmd);
 989 }
 990
 991 static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
 992 {
 993         struct se_cmd *se_cmd = &cmd->se_cmd;
 994         struct f_uas *fu = cmd->fu;
 995         struct usb_gadget *gadget = fuas_to_gadget(fu);
 996
 997         if (!gadget->sg_supported) {
 998                 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
 999                 if (!cmd->data_buf)
1000                         return -ENOMEM;
1001
1002                 req->buf = cmd->data_buf;
1003         } else {
1004                 req->buf = NULL;
1005                 req->num_sgs = se_cmd->t_data_nents;
1006                 req->sg = se_cmd->t_data_sg;
1007         }
1008
1009         req->complete = usbg_data_write_cmpl;
1010         req->length = se_cmd->data_length;
1011         req->context = cmd;
1012         return 0;
1013 }
1014
1015 static int usbg_send_status_response(struct se_cmd *se_cmd)
1016 {
1017         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1018                         se_cmd);
1019         struct f_uas *fu = cmd->fu;
1020
1021         if (fu->flags & USBG_IS_BOT)
1022                 return bot_send_status_response(cmd);
1023         else
1024                 return uasp_send_status_response(cmd);
1025 }
1026
1027 static int usbg_send_write_request(struct se_cmd *se_cmd)
1028 {
1029         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1030                         se_cmd);
1031         struct f_uas *fu = cmd->fu;
1032
1033         if (fu->flags & USBG_IS_BOT)
1034                 return bot_send_write_request(cmd);
1035         else
1036                 return uasp_send_write_request(cmd);
1037 }
1038
1039 static int usbg_send_read_response(struct se_cmd *se_cmd)
1040 {
1041         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1042                         se_cmd);
1043         struct f_uas *fu = cmd->fu;
1044
1045         if (fu->flags & USBG_IS_BOT)
1046                 return bot_send_read_response(cmd);
1047         else
1048                 return uasp_send_read_response(cmd);
1049 }
1050
1051 static void usbg_cmd_work(struct work_struct *work)
1052 {
1053         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1054         struct se_cmd *se_cmd;
1055         struct tcm_usbg_nexus *tv_nexus;
1056         struct usbg_tpg *tpg;
1057         int dir;
1058
1059         se_cmd = &cmd->se_cmd;
1060         tpg = cmd->fu->tpg;
1061         tv_nexus = tpg->tpg_nexus;
1062         dir = get_cmd_dir(cmd->cmd_buf);
1063         if (dir < 0) {
1064                 transport_init_se_cmd(se_cmd,
1065                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1066                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1067                                 cmd->prio_attr, cmd->sense_iu.sense);
1068
1069                 transport_send_check_condition_and_sense(se_cmd,
1070                                 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1071                 usbg_cleanup_cmd(cmd);
1072                 return;
1073         }
1074
1075         target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1076                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1077                         0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE);
1078 }
1079
1080 static int usbg_submit_command(struct f_uas *fu,
1081                 void *cmdbuf, unsigned int len)
1082 {
1083         struct command_iu *cmd_iu = cmdbuf;
1084         struct usbg_cmd *cmd;
1085         struct usbg_tpg *tpg;
1086         struct se_cmd *se_cmd;
1087         struct tcm_usbg_nexus *tv_nexus;
1088         u32 cmd_len;
1089         int ret;
1090
1091         if (cmd_iu->iu_id != IU_ID_COMMAND) {
1092                 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1093                 return -EINVAL;
1094         }
1095
1096         cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1097         if (!cmd)
1098                 return -ENOMEM;
1099
1100         cmd->fu = fu;
1101
1102         /* XXX until I figure out why I can't free in on complete */
1103         kref_init(&cmd->ref);
1104         kref_get(&cmd->ref);
1105
1106         tpg = fu->tpg;
1107         cmd_len = (cmd_iu->len & ~0x3) + 16;
1108         if (cmd_len > USBG_MAX_CMD)
1109                 goto err;
1110
1111         memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1112
1113         cmd->tag = be16_to_cpup(&cmd_iu->tag);
1114         if (fu->flags & USBG_USE_STREAMS) {
1115                 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1116                         goto err;
1117                 if (!cmd->tag)
1118                         cmd->stream = &fu->stream[0];
1119                 else
1120                         cmd->stream = &fu->stream[cmd->tag - 1];
1121         } else {
1122                 cmd->stream = &fu->stream[0];
1123         }
1124
1125         tv_nexus = tpg->tpg_nexus;
1126         if (!tv_nexus) {
1127                 pr_err("Missing nexus, ignoring command\n");
1128                 goto err;
1129         }
1130
1131         switch (cmd_iu->prio_attr & 0x7) {
1132         case UAS_HEAD_TAG:
1133                 cmd->prio_attr = MSG_HEAD_TAG;
1134                 break;
1135         case UAS_ORDERED_TAG:
1136                 cmd->prio_attr = MSG_ORDERED_TAG;
1137                 break;
1138         case UAS_ACA:
1139                 cmd->prio_attr = MSG_ACA_TAG;
1140                 break;
1141         default:
1142                 pr_debug_once("Unsupported prio_attr: %02x.\n",
1143                                 cmd_iu->prio_attr);
1144         case UAS_SIMPLE_TAG:
1145                 cmd->prio_attr = MSG_SIMPLE_TAG;
1146                 break;
1147         }
1148
1149         se_cmd = &cmd->se_cmd;
1150         cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1151
1152         INIT_WORK(&cmd->work, usbg_cmd_work);
1153         ret = queue_work(tpg->workqueue, &cmd->work);
1154         if (ret < 0)
1155                 goto err;
1156
1157         return 0;
1158 err:
1159         kfree(cmd);
1160         return -EINVAL;
1161 }
1162
1163 static void bot_cmd_work(struct work_struct *work)
1164 {
1165         struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1166         struct se_cmd *se_cmd;
1167         struct tcm_usbg_nexus *tv_nexus;
1168         struct usbg_tpg *tpg;
1169         int dir;
1170
1171         se_cmd = &cmd->se_cmd;
1172         tpg = cmd->fu->tpg;
1173         tv_nexus = tpg->tpg_nexus;
1174         dir = get_cmd_dir(cmd->cmd_buf);
1175         if (dir < 0) {
1176                 transport_init_se_cmd(se_cmd,
1177                                 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1178                                 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1179                                 cmd->prio_attr, cmd->sense_iu.sense);
1180
1181                 transport_send_check_condition_and_sense(se_cmd,
1182                                 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1183                 usbg_cleanup_cmd(cmd);
1184                 return;
1185         }
1186
1187         target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1188                         cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1189                         cmd->data_len, cmd->prio_attr, dir, 0);
1190 }
1191
1192 static int bot_submit_command(struct f_uas *fu,
1193                 void *cmdbuf, unsigned int len)
1194 {
1195         struct bulk_cb_wrap *cbw = cmdbuf;
1196         struct usbg_cmd *cmd;
1197         struct usbg_tpg *tpg;
1198         struct se_cmd *se_cmd;
1199         struct tcm_usbg_nexus *tv_nexus;
1200         u32 cmd_len;
1201         int ret;
1202
1203         if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1204                 pr_err("Wrong signature on CBW\n");
1205                 return -EINVAL;
1206         }
1207         if (len != 31) {
1208                 pr_err("Wrong length for CBW\n");
1209                 return -EINVAL;
1210         }
1211
1212         cmd_len = cbw->Length;
1213         if (cmd_len < 1 || cmd_len > 16)
1214                 return -EINVAL;
1215
1216         cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1217         if (!cmd)
1218                 return -ENOMEM;
1219
1220         cmd->fu = fu;
1221
1222         /* XXX until I figure out why I can't free in on complete */
1223         kref_init(&cmd->ref);
1224         kref_get(&cmd->ref);
1225
1226         tpg = fu->tpg;
1227
1228         memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1229
1230         cmd->bot_tag = cbw->Tag;
1231
1232         tv_nexus = tpg->tpg_nexus;
1233         if (!tv_nexus) {
1234                 pr_err("Missing nexus, ignoring command\n");
1235                 goto err;
1236         }
1237
1238         cmd->prio_attr = MSG_SIMPLE_TAG;
1239         se_cmd = &cmd->se_cmd;
1240         cmd->unpacked_lun = cbw->Lun;
1241         cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1242         cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1243
1244         INIT_WORK(&cmd->work, bot_cmd_work);
1245         ret = queue_work(tpg->workqueue, &cmd->work);
1246         if (ret < 0)
1247                 goto err;
1248
1249         return 0;
1250 err:
1251         kfree(cmd);
1252         return -EINVAL;
1253 }
1254
1255 /* Start fabric.c code */
1256
1257 static int usbg_check_true(struct se_portal_group *se_tpg)
1258 {
1259         return 1;
1260 }
1261
1262 static int usbg_check_false(struct se_portal_group *se_tpg)
1263 {
1264         return 0;
1265 }
1266
1267 static char *usbg_get_fabric_name(void)
1268 {
1269         return "usb_gadget";
1270 }
1271
1272 static u8 usbg_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1273 {
1274         struct usbg_tpg *tpg = container_of(se_tpg,
1275                                 struct usbg_tpg, se_tpg);
1276         struct usbg_tport *tport = tpg->tport;
1277         u8 proto_id;
1278
1279         switch (tport->tport_proto_id) {
1280         case SCSI_PROTOCOL_SAS:
1281         default:
1282                 proto_id = sas_get_fabric_proto_ident(se_tpg);
1283                 break;
1284         }
1285
1286         return proto_id;
1287 }
1288
1289 static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1290 {
1291         struct usbg_tpg *tpg = container_of(se_tpg,
1292                                 struct usbg_tpg, se_tpg);
1293         struct usbg_tport *tport = tpg->tport;
1294
1295         return &tport->tport_name[0];
1296 }
1297
1298 static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1299 {
1300         struct usbg_tpg *tpg = container_of(se_tpg,
1301                                 struct usbg_tpg, se_tpg);
1302         return tpg->tport_tpgt;
1303 }
1304
1305 static u32 usbg_get_default_depth(struct se_portal_group *se_tpg)
1306 {
1307         return 1;
1308 }
1309
1310 static u32 usbg_get_pr_transport_id(
1311         struct se_portal_group *se_tpg,
1312         struct se_node_acl *se_nacl,
1313         struct t10_pr_registration *pr_reg,
1314         int *format_code,
1315         unsigned char *buf)
1316 {
1317         struct usbg_tpg *tpg = container_of(se_tpg,
1318                                 struct usbg_tpg, se_tpg);
1319         struct usbg_tport *tport = tpg->tport;
1320         int ret = 0;
1321
1322         switch (tport->tport_proto_id) {
1323         case SCSI_PROTOCOL_SAS:
1324         default:
1325                 ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1326                                         format_code, buf);
1327                 break;
1328         }
1329
1330         return ret;
1331 }
1332
1333 static u32 usbg_get_pr_transport_id_len(
1334         struct se_portal_group *se_tpg,
1335         struct se_node_acl *se_nacl,
1336         struct t10_pr_registration *pr_reg,
1337         int *format_code)
1338 {
1339         struct usbg_tpg *tpg = container_of(se_tpg,
1340                                 struct usbg_tpg, se_tpg);
1341         struct usbg_tport *tport = tpg->tport;
1342         int ret = 0;
1343
1344         switch (tport->tport_proto_id) {
1345         case SCSI_PROTOCOL_SAS:
1346         default:
1347                 ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1348                                         format_code);
1349                 break;
1350         }
1351
1352         return ret;
1353 }
1354
1355 static char *usbg_parse_pr_out_transport_id(
1356         struct se_portal_group *se_tpg,
1357         const char *buf,
1358         u32 *out_tid_len,
1359         char **port_nexus_ptr)
1360 {
1361         struct usbg_tpg *tpg = container_of(se_tpg,
1362                                 struct usbg_tpg, se_tpg);
1363         struct usbg_tport *tport = tpg->tport;
1364         char *tid = NULL;
1365
1366         switch (tport->tport_proto_id) {
1367         case SCSI_PROTOCOL_SAS:
1368         default:
1369                 tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1370                                         port_nexus_ptr);
1371         }
1372
1373         return tid;
1374 }
1375
1376 static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg)
1377 {
1378         struct usbg_nacl *nacl;
1379
1380         nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL);
1381         if (!nacl) {
1382                 printk(KERN_ERR "Unable to alocate struct usbg_nacl\n");
1383                 return NULL;
1384         }
1385
1386         return &nacl->se_node_acl;
1387 }
1388
1389 static void usbg_release_fabric_acl(
1390         struct se_portal_group *se_tpg,
1391         struct se_node_acl *se_nacl)
1392 {
1393         struct usbg_nacl *nacl = container_of(se_nacl,
1394                         struct usbg_nacl, se_node_acl);
1395         kfree(nacl);
1396 }
1397
1398 static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1399 {
1400         return 1;
1401 }
1402
1403 static int usbg_new_cmd(struct se_cmd *se_cmd)
1404 {
1405         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1406                         se_cmd);
1407         int ret;
1408
1409         ret = target_setup_cmd_from_cdb(se_cmd, cmd->cmd_buf);
1410         if (ret)
1411                 return ret;
1412
1413         return transport_generic_map_mem_to_cmd(se_cmd, NULL, 0, NULL, 0);
1414 }
1415
1416 static void usbg_cmd_release(struct kref *ref)
1417 {
1418         struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1419                         ref);
1420
1421         transport_generic_free_cmd(&cmd->se_cmd, 0);
1422 }
1423
1424 static void usbg_release_cmd(struct se_cmd *se_cmd)
1425 {
1426         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1427                         se_cmd);
1428         kfree(cmd->data_buf);
1429         kfree(cmd);
1430         return;
1431 }
1432
1433 static int usbg_shutdown_session(struct se_session *se_sess)
1434 {
1435         return 0;
1436 }
1437
1438 static void usbg_close_session(struct se_session *se_sess)
1439 {
1440         return;
1441 }
1442
1443 static u32 usbg_sess_get_index(struct se_session *se_sess)
1444 {
1445         return 0;
1446 }
1447
1448 /*
1449  * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1450  */
1451 static int usbg_write_pending_status(struct se_cmd *se_cmd)
1452 {
1453         return 0;
1454 }
1455
1456 static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1457 {
1458         return;
1459 }
1460
1461 static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
1462 {
1463         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1464                         se_cmd);
1465         struct f_uas *fu = cmd->fu;
1466
1467         if (fu->flags & USBG_IS_BOT)
1468                 return le32_to_cpu(cmd->bot_tag);
1469         else
1470                 return cmd->tag;
1471 }
1472
1473 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1474 {
1475         return 0;
1476 }
1477
1478 static int usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1479 {
1480         return 0;
1481 }
1482
1483 static u16 usbg_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
1484 {
1485         return 0;
1486 }
1487
1488 static u16 usbg_get_fabric_sense_len(void)
1489 {
1490         return 0;
1491 }
1492
1493 static const char *usbg_check_wwn(const char *name)
1494 {
1495         const char *n;
1496         unsigned int len;
1497
1498         n = strstr(name, "naa.");
1499         if (!n)
1500                 return NULL;
1501         n += 4;
1502         len = strlen(n);
1503         if (len == 0 || len > USBG_NAMELEN - 1)
1504                 return NULL;
1505         return n;
1506 }
1507
1508 static struct se_node_acl *usbg_make_nodeacl(
1509         struct se_portal_group *se_tpg,
1510         struct config_group *group,
1511         const char *name)
1512 {
1513         struct se_node_acl *se_nacl, *se_nacl_new;
1514         struct usbg_nacl *nacl;
1515         u64 wwpn = 0;
1516         u32 nexus_depth;
1517         const char *wnn_name;
1518
1519         wnn_name = usbg_check_wwn(name);
1520         if (!wnn_name)
1521                 return ERR_PTR(-EINVAL);
1522         se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1523         if (!(se_nacl_new))
1524                 return ERR_PTR(-ENOMEM);
1525
1526         nexus_depth = 1;
1527         /*
1528          * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1529          * when converting a NodeACL from demo mode -> explict
1530          */
1531         se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1532                                 name, nexus_depth);
1533         if (IS_ERR(se_nacl)) {
1534                 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1535                 return se_nacl;
1536         }
1537         /*
1538          * Locate our struct usbg_nacl and set the FC Nport WWPN
1539          */
1540         nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
1541         nacl->iport_wwpn = wwpn;
1542         snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
1543         return se_nacl;
1544 }
1545
1546 static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1547 {
1548         struct usbg_nacl *nacl = container_of(se_acl,
1549                                 struct usbg_nacl, se_node_acl);
1550         core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1551         kfree(nacl);
1552 }
1553
1554 struct usbg_tpg *the_only_tpg_I_currently_have;
1555
1556 static struct se_portal_group *usbg_make_tpg(
1557         struct se_wwn *wwn,
1558         struct config_group *group,
1559         const char *name)
1560 {
1561         struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1562                         tport_wwn);
1563         struct usbg_tpg *tpg;
1564         unsigned long tpgt;
1565         int ret;
1566
1567         if (strstr(name, "tpgt_") != name)
1568                 return ERR_PTR(-EINVAL);
1569         if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1570                 return ERR_PTR(-EINVAL);
1571         if (the_only_tpg_I_currently_have) {
1572                 pr_err("Until the gadget framework can't handle multiple\n");
1573                 pr_err("gadgets, you can't do this here.\n");
1574                 return ERR_PTR(-EBUSY);
1575         }
1576
1577         tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1578         if (!tpg) {
1579                 printk(KERN_ERR "Unable to allocate struct usbg_tpg");
1580                 return ERR_PTR(-ENOMEM);
1581         }
1582         mutex_init(&tpg->tpg_mutex);
1583         atomic_set(&tpg->tpg_port_count, 0);
1584         tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1585         if (!tpg->workqueue) {
1586                 kfree(tpg);
1587                 return NULL;
1588         }
1589
1590         tpg->tport = tport;
1591         tpg->tport_tpgt = tpgt;
1592
1593         ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
1594                                 &tpg->se_tpg, tpg,
1595                                 TRANSPORT_TPG_TYPE_NORMAL);
1596         if (ret < 0) {
1597                 destroy_workqueue(tpg->workqueue);
1598                 kfree(tpg);
1599                 return NULL;
1600         }
1601         the_only_tpg_I_currently_have = tpg;
1602         return &tpg->se_tpg;
1603 }
1604
1605 static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1606 {
1607         struct usbg_tpg *tpg = container_of(se_tpg,
1608                                 struct usbg_tpg, se_tpg);
1609
1610         core_tpg_deregister(se_tpg);
1611         destroy_workqueue(tpg->workqueue);
1612         kfree(tpg);
1613         the_only_tpg_I_currently_have = NULL;
1614 }
1615
1616 static struct se_wwn *usbg_make_tport(
1617         struct target_fabric_configfs *tf,
1618         struct config_group *group,
1619         const char *name)
1620 {
1621         struct usbg_tport *tport;
1622         const char *wnn_name;
1623         u64 wwpn = 0;
1624
1625         wnn_name = usbg_check_wwn(name);
1626         if (!wnn_name)
1627                 return ERR_PTR(-EINVAL);
1628
1629         tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1630         if (!(tport)) {
1631                 printk(KERN_ERR "Unable to allocate struct usbg_tport");
1632                 return ERR_PTR(-ENOMEM);
1633         }
1634         tport->tport_wwpn = wwpn;
1635         snprintf(tport->tport_name, sizeof(tport->tport_name), wnn_name);
1636         return &tport->tport_wwn;
1637 }
1638
1639 static void usbg_drop_tport(struct se_wwn *wwn)
1640 {
1641         struct usbg_tport *tport = container_of(wwn,
1642                                 struct usbg_tport, tport_wwn);
1643         kfree(tport);
1644 }
1645
1646 /*
1647  * If somebody feels like dropping the version property, go ahead.
1648  */
1649 static ssize_t usbg_wwn_show_attr_version(
1650         struct target_fabric_configfs *tf,
1651         char *page)
1652 {
1653         return sprintf(page, "usb-gadget fabric module\n");
1654 }
1655 TF_WWN_ATTR_RO(usbg, version);
1656
1657 static struct configfs_attribute *usbg_wwn_attrs[] = {
1658         &usbg_wwn_version.attr,
1659         NULL,
1660 };
1661
1662 static ssize_t tcm_usbg_tpg_show_enable(
1663                 struct se_portal_group *se_tpg,
1664                 char *page)
1665 {
1666         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1667
1668         return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1669 }
1670
1671 static int usbg_attach(struct usbg_tpg *);
1672 static void usbg_detach(struct usbg_tpg *);
1673
1674 static ssize_t tcm_usbg_tpg_store_enable(
1675                 struct se_portal_group *se_tpg,
1676                 const char *page,
1677                 size_t count)
1678 {
1679         struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1680         unsigned long op;
1681         ssize_t ret;
1682
1683         ret = kstrtoul(page, 0, &op);
1684         if (ret < 0)
1685                 return -EINVAL;
1686         if (op > 1)
1687                 return -EINVAL;
1688
1689         if (op && tpg->gadget_connect)
1690                 goto out;
1691         if (!op && !tpg->gadget_connect)
1692                 goto out;
1693
1694         if (op) {
1695                 ret = usbg_attach(tpg);
1696                 if (ret)
1697                         goto out;
1698         } else {
1699                 usbg_detach(tpg);
1700         }
1701         tpg->gadget_connect = op;
1702 out:
1703         return count;
1704 }
1705 TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1706
1707 static ssize_t tcm_usbg_tpg_show_nexus(
1708                 struct se_portal_group *se_tpg,
1709                 char *page)
1710 {
1711         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1712         struct tcm_usbg_nexus *tv_nexus;
1713         ssize_t ret;
1714
1715         mutex_lock(&tpg->tpg_mutex);
1716         tv_nexus = tpg->tpg_nexus;
1717         if (!tv_nexus) {
1718                 ret = -ENODEV;
1719                 goto out;
1720         }
1721         ret = snprintf(page, PAGE_SIZE, "%s\n",
1722                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1723 out:
1724         mutex_unlock(&tpg->tpg_mutex);
1725         return ret;
1726 }
1727
1728 static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1729 {
1730         struct se_portal_group *se_tpg;
1731         struct tcm_usbg_nexus *tv_nexus;
1732         int ret;
1733
1734         mutex_lock(&tpg->tpg_mutex);
1735         if (tpg->tpg_nexus) {
1736                 ret = -EEXIST;
1737                 pr_debug("tpg->tpg_nexus already exists\n");
1738                 goto err_unlock;
1739         }
1740         se_tpg = &tpg->se_tpg;
1741
1742         ret = -ENOMEM;
1743         tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1744         if (!tv_nexus) {
1745                 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1746                 goto err_unlock;
1747         }
1748         tv_nexus->tvn_se_sess = transport_init_session();
1749         if (IS_ERR(tv_nexus->tvn_se_sess))
1750                 goto err_free;
1751
1752         /*
1753          * Since we are running in 'demo mode' this call with generate a
1754          * struct se_node_acl for the tcm_vhost struct se_portal_group with
1755          * the SCSI Initiator port name of the passed configfs group 'name'.
1756          */
1757         tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1758                         se_tpg, name);
1759         if (!tv_nexus->tvn_se_sess->se_node_acl) {
1760                 pr_debug("core_tpg_check_initiator_node_acl() failed"
1761                                 " for %s\n", name);
1762                 goto err_session;
1763         }
1764         /*
1765          * Now register the TCM vHost virtual I_T Nexus as active with the
1766          * call to __transport_register_session()
1767          */
1768         __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1769                         tv_nexus->tvn_se_sess, tv_nexus);
1770         tpg->tpg_nexus = tv_nexus;
1771         mutex_unlock(&tpg->tpg_mutex);
1772         return 0;
1773
1774 err_session:
1775         transport_free_session(tv_nexus->tvn_se_sess);
1776 err_free:
1777         kfree(tv_nexus);
1778 err_unlock:
1779         mutex_unlock(&tpg->tpg_mutex);
1780         return ret;
1781 }
1782
1783 static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1784 {
1785         struct se_session *se_sess;
1786         struct tcm_usbg_nexus *tv_nexus;
1787         int ret = -ENODEV;
1788
1789         mutex_lock(&tpg->tpg_mutex);
1790         tv_nexus = tpg->tpg_nexus;
1791         if (!tv_nexus)
1792                 goto out;
1793
1794         se_sess = tv_nexus->tvn_se_sess;
1795         if (!se_sess)
1796                 goto out;
1797
1798         if (atomic_read(&tpg->tpg_port_count)) {
1799                 ret = -EPERM;
1800                 pr_err("Unable to remove Host I_T Nexus with"
1801                                 " active TPG port count: %d\n",
1802                                 atomic_read(&tpg->tpg_port_count));
1803                 goto out;
1804         }
1805
1806         pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1807                         tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1808         /*
1809          * Release the SCSI I_T Nexus to the emulated vHost Target Port
1810          */
1811         transport_deregister_session(tv_nexus->tvn_se_sess);
1812         tpg->tpg_nexus = NULL;
1813
1814         kfree(tv_nexus);
1815 out:
1816         mutex_unlock(&tpg->tpg_mutex);
1817         return 0;
1818 }
1819
1820 static ssize_t tcm_usbg_tpg_store_nexus(
1821                 struct se_portal_group *se_tpg,
1822                 const char *page,
1823                 size_t count)
1824 {
1825         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1826         unsigned char i_port[USBG_NAMELEN], *ptr;
1827         int ret;
1828
1829         if (!strncmp(page, "NULL", 4)) {
1830                 ret = tcm_usbg_drop_nexus(tpg);
1831                 return (!ret) ? count : ret;
1832         }
1833         if (strlen(page) > USBG_NAMELEN) {
1834                 pr_err("Emulated NAA Sas Address: %s, exceeds"
1835                                 " max: %d\n", page, USBG_NAMELEN);
1836                 return -EINVAL;
1837         }
1838         snprintf(i_port, USBG_NAMELEN, "%s", page);
1839
1840         ptr = strstr(i_port, "naa.");
1841         if (!ptr) {
1842                 pr_err("Missing 'naa.' prefix\n");
1843                 return -EINVAL;
1844         }
1845
1846         if (i_port[strlen(i_port) - 1] == '\n')
1847                 i_port[strlen(i_port) - 1] = '\0';
1848
1849         ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1850         if (ret < 0)
1851                 return ret;
1852         return count;
1853 }
1854 TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1855
1856 static struct configfs_attribute *usbg_base_attrs[] = {
1857         &tcm_usbg_tpg_enable.attr,
1858         &tcm_usbg_tpg_nexus.attr,
1859         NULL,
1860 };
1861
1862 static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1863 {
1864         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1865
1866         atomic_inc(&tpg->tpg_port_count);
1867         smp_mb__after_atomic_inc();
1868         return 0;
1869 }
1870
1871 static void usbg_port_unlink(struct se_portal_group *se_tpg,
1872                 struct se_lun *se_lun)
1873 {
1874         struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1875
1876         atomic_dec(&tpg->tpg_port_count);
1877         smp_mb__after_atomic_dec();
1878 }
1879
1880 static int usbg_check_stop_free(struct se_cmd *se_cmd)
1881 {
1882         struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1883                         se_cmd);
1884
1885         kref_put(&cmd->ref, usbg_cmd_release);
1886         return 1;
1887 }
1888
1889 static struct target_core_fabric_ops usbg_ops = {
1890         .get_fabric_name                = usbg_get_fabric_name,
1891         .get_fabric_proto_ident         = usbg_get_fabric_proto_ident,
1892         .tpg_get_wwn                    = usbg_get_fabric_wwn,
1893         .tpg_get_tag                    = usbg_get_tag,
1894         .tpg_get_default_depth          = usbg_get_default_depth,
1895         .tpg_get_pr_transport_id        = usbg_get_pr_transport_id,
1896         .tpg_get_pr_transport_id_len    = usbg_get_pr_transport_id_len,
1897         .tpg_parse_pr_out_transport_id  = usbg_parse_pr_out_transport_id,
1898         .tpg_check_demo_mode            = usbg_check_true,
1899         .tpg_check_demo_mode_cache      = usbg_check_false,
1900         .tpg_check_demo_mode_write_protect = usbg_check_false,
1901         .tpg_check_prod_mode_write_protect = usbg_check_false,
1902         .tpg_alloc_fabric_acl           = usbg_alloc_fabric_acl,
1903         .tpg_release_fabric_acl         = usbg_release_fabric_acl,
1904         .tpg_get_inst_index             = usbg_tpg_get_inst_index,
1905         .new_cmd_map                    = usbg_new_cmd,
1906         .release_cmd                    = usbg_release_cmd,
1907         .shutdown_session               = usbg_shutdown_session,
1908         .close_session                  = usbg_close_session,
1909         .sess_get_index                 = usbg_sess_get_index,
1910         .sess_get_initiator_sid         = NULL,
1911         .write_pending                  = usbg_send_write_request,
1912         .write_pending_status           = usbg_write_pending_status,
1913         .set_default_node_attributes    = usbg_set_default_node_attrs,
1914         .get_task_tag                   = usbg_get_task_tag,
1915         .get_cmd_state                  = usbg_get_cmd_state,
1916         .queue_data_in                  = usbg_send_read_response,
1917         .queue_status                   = usbg_send_status_response,
1918         .queue_tm_rsp                   = usbg_queue_tm_rsp,
1919         .get_fabric_sense_len           = usbg_get_fabric_sense_len,
1920         .set_fabric_sense_len           = usbg_set_fabric_sense_len,
1921         .check_stop_free                = usbg_check_stop_free,
1922
1923         .fabric_make_wwn                = usbg_make_tport,
1924         .fabric_drop_wwn                = usbg_drop_tport,
1925         .fabric_make_tpg                = usbg_make_tpg,
1926         .fabric_drop_tpg                = usbg_drop_tpg,
1927         .fabric_post_link               = usbg_port_link,
1928         .fabric_pre_unlink              = usbg_port_unlink,
1929         .fabric_make_np                 = NULL,
1930         .fabric_drop_np                 = NULL,
1931         .fabric_make_nodeacl            = usbg_make_nodeacl,
1932         .fabric_drop_nodeacl            = usbg_drop_nodeacl,
1933 };
1934
1935 static int usbg_register_configfs(void)
1936 {
1937         struct target_fabric_configfs *fabric;
1938         int ret;
1939
1940         fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
1941         if (IS_ERR(fabric)) {
1942                 printk(KERN_ERR "target_fabric_configfs_init() failed\n");
1943                 return PTR_ERR(fabric);
1944         }
1945
1946         fabric->tf_ops = usbg_ops;
1947         TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
1948         TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
1949         TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1950         TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1951         TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1952         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1953         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1954         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1955         TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1956         ret = target_fabric_configfs_register(fabric);
1957         if (ret < 0) {
1958                 printk(KERN_ERR "target_fabric_configfs_register() failed"
1959                                 " for usb-gadget\n");
1960                 return ret;
1961         }
1962         usbg_fabric_configfs = fabric;
1963         return 0;
1964 };
1965
1966 static void usbg_deregister_configfs(void)
1967 {
1968         if (!(usbg_fabric_configfs))
1969                 return;
1970
1971         target_fabric_configfs_deregister(usbg_fabric_configfs);
1972         usbg_fabric_configfs = NULL;
1973 };
1974
1975 /* Start gadget.c code */
1976
1977 static struct usb_interface_descriptor bot_intf_desc = {
1978         .bLength =              sizeof(bot_intf_desc),
1979         .bDescriptorType =      USB_DT_INTERFACE,
1980         .bAlternateSetting =    0,
1981         .bNumEndpoints =        2,
1982         .bAlternateSetting =    USB_G_ALT_INT_BBB,
1983         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1984         .bInterfaceSubClass =   USB_SC_SCSI,
1985         .bInterfaceProtocol =   USB_PR_BULK,
1986         .iInterface =           USB_G_STR_INT_UAS,
1987 };
1988
1989 static struct usb_interface_descriptor uasp_intf_desc = {
1990         .bLength =              sizeof(uasp_intf_desc),
1991         .bDescriptorType =      USB_DT_INTERFACE,
1992         .bNumEndpoints =        4,
1993         .bAlternateSetting =    USB_G_ALT_INT_UAS,
1994         .bInterfaceClass =      USB_CLASS_MASS_STORAGE,
1995         .bInterfaceSubClass =   USB_SC_SCSI,
1996         .bInterfaceProtocol =   USB_PR_UAS,
1997         .iInterface =           USB_G_STR_INT_BBB,
1998 };
1999
2000 static struct usb_endpoint_descriptor uasp_bi_desc = {
2001         .bLength =              USB_DT_ENDPOINT_SIZE,
2002         .bDescriptorType =      USB_DT_ENDPOINT,
2003         .bEndpointAddress =     USB_DIR_IN,
2004         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2005         .wMaxPacketSize =       cpu_to_le16(512),
2006 };
2007
2008 static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
2009         .bLength =              USB_DT_ENDPOINT_SIZE,
2010         .bDescriptorType =      USB_DT_ENDPOINT,
2011         .bEndpointAddress =     USB_DIR_IN,
2012         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2013 };
2014
2015 static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
2016         .bLength =              sizeof(uasp_bi_pipe_desc),
2017         .bDescriptorType =      USB_DT_PIPE_USAGE,
2018         .bPipeID =              DATA_IN_PIPE_ID,
2019 };
2020
2021 static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
2022         .bLength =              USB_DT_ENDPOINT_SIZE,
2023         .bDescriptorType =      USB_DT_ENDPOINT,
2024         .bEndpointAddress =     USB_DIR_IN,
2025         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2026         .wMaxPacketSize =       cpu_to_le16(1024),
2027 };
2028
2029 static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
2030         .bLength =              sizeof(uasp_bi_ep_comp_desc),
2031         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2032         .bMaxBurst =            0,
2033         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2034         .wBytesPerInterval =    0,
2035 };
2036
2037 static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
2038         .bLength =              sizeof(bot_bi_ep_comp_desc),
2039         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2040         .bMaxBurst =            0,
2041 };
2042
2043 static struct usb_endpoint_descriptor uasp_bo_desc = {
2044         .bLength =              USB_DT_ENDPOINT_SIZE,
2045         .bDescriptorType =      USB_DT_ENDPOINT,
2046         .bEndpointAddress =     USB_DIR_OUT,
2047         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2048         .wMaxPacketSize =       cpu_to_le16(512),
2049 };
2050
2051 static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
2052         .bLength =              USB_DT_ENDPOINT_SIZE,
2053         .bDescriptorType =      USB_DT_ENDPOINT,
2054         .bEndpointAddress =     USB_DIR_OUT,
2055         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2056 };
2057
2058 static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
2059         .bLength =              sizeof(uasp_bo_pipe_desc),
2060         .bDescriptorType =      USB_DT_PIPE_USAGE,
2061         .bPipeID =              DATA_OUT_PIPE_ID,
2062 };
2063
2064 static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
2065         .bLength =              USB_DT_ENDPOINT_SIZE,
2066         .bDescriptorType =      USB_DT_ENDPOINT,
2067         .bEndpointAddress =     USB_DIR_OUT,
2068         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2069         .wMaxPacketSize =       cpu_to_le16(0x400),
2070 };
2071
2072 static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
2073         .bLength =              sizeof(uasp_bo_ep_comp_desc),
2074         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2075         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2076 };
2077
2078 static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
2079         .bLength =              sizeof(bot_bo_ep_comp_desc),
2080         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2081 };
2082
2083 static struct usb_endpoint_descriptor uasp_status_desc = {
2084         .bLength =              USB_DT_ENDPOINT_SIZE,
2085         .bDescriptorType =      USB_DT_ENDPOINT,
2086         .bEndpointAddress =     USB_DIR_IN,
2087         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2088         .wMaxPacketSize =       cpu_to_le16(512),
2089 };
2090
2091 static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2092         .bLength =              USB_DT_ENDPOINT_SIZE,
2093         .bDescriptorType =      USB_DT_ENDPOINT,
2094         .bEndpointAddress =     USB_DIR_IN,
2095         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2096 };
2097
2098 static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2099         .bLength =              sizeof(uasp_status_pipe_desc),
2100         .bDescriptorType =      USB_DT_PIPE_USAGE,
2101         .bPipeID =              STATUS_PIPE_ID,
2102 };
2103
2104 static struct usb_endpoint_descriptor uasp_ss_status_desc = {
2105         .bLength =              USB_DT_ENDPOINT_SIZE,
2106         .bDescriptorType =      USB_DT_ENDPOINT,
2107         .bEndpointAddress =     USB_DIR_IN,
2108         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2109         .wMaxPacketSize =       cpu_to_le16(1024),
2110 };
2111
2112 static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2113         .bLength =              sizeof(uasp_status_in_ep_comp_desc),
2114         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2115         .bmAttributes =         UASP_SS_EP_COMP_LOG_STREAMS,
2116 };
2117
2118 static struct usb_endpoint_descriptor uasp_cmd_desc = {
2119         .bLength =              USB_DT_ENDPOINT_SIZE,
2120         .bDescriptorType =      USB_DT_ENDPOINT,
2121         .bEndpointAddress =     USB_DIR_OUT,
2122         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2123         .wMaxPacketSize =       cpu_to_le16(512),
2124 };
2125
2126 static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2127         .bLength =              USB_DT_ENDPOINT_SIZE,
2128         .bDescriptorType =      USB_DT_ENDPOINT,
2129         .bEndpointAddress =     USB_DIR_OUT,
2130         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2131 };
2132
2133 static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2134         .bLength =              sizeof(uasp_cmd_pipe_desc),
2135         .bDescriptorType =      USB_DT_PIPE_USAGE,
2136         .bPipeID =              CMD_PIPE_ID,
2137 };
2138
2139 static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
2140         .bLength =              USB_DT_ENDPOINT_SIZE,
2141         .bDescriptorType =      USB_DT_ENDPOINT,
2142         .bEndpointAddress =     USB_DIR_OUT,
2143         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
2144         .wMaxPacketSize =       cpu_to_le16(1024),
2145 };
2146
2147 static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2148         .bLength =              sizeof(uasp_cmd_comp_desc),
2149         .bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
2150 };
2151
2152 static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2153         (struct usb_descriptor_header *) &bot_intf_desc,
2154         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2155         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2156
2157         (struct usb_descriptor_header *) &uasp_intf_desc,
2158         (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2159         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2160         (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2161         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2162         (struct usb_descriptor_header *) &uasp_fs_status_desc,
2163         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2164         (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2165         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2166 };
2167
2168 static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2169         (struct usb_descriptor_header *) &bot_intf_desc,
2170         (struct usb_descriptor_header *) &uasp_bi_desc,
2171         (struct usb_descriptor_header *) &uasp_bo_desc,
2172
2173         (struct usb_descriptor_header *) &uasp_intf_desc,
2174         (struct usb_descriptor_header *) &uasp_bi_desc,
2175         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2176         (struct usb_descriptor_header *) &uasp_bo_desc,
2177         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2178         (struct usb_descriptor_header *) &uasp_status_desc,
2179         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2180         (struct usb_descriptor_header *) &uasp_cmd_desc,
2181         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2182         NULL,
2183 };
2184
2185 static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2186         (struct usb_descriptor_header *) &bot_intf_desc,
2187         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2188         (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2189         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2190         (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2191
2192         (struct usb_descriptor_header *) &uasp_intf_desc,
2193         (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2194         (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2195         (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2196         (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2197         (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2198         (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2199         (struct usb_descriptor_header *) &uasp_ss_status_desc,
2200         (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2201         (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2202         (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2203         (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2204         (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2205         NULL,
2206 };
2207
2208 #define UAS_VENDOR_ID   0x0525  /* NetChip */
2209 #define UAS_PRODUCT_ID  0xa4a5  /* Linux-USB File-backed Storage Gadget */
2210
2211 static struct usb_device_descriptor usbg_device_desc = {
2212         .bLength =              sizeof(usbg_device_desc),
2213         .bDescriptorType =      USB_DT_DEVICE,
2214         .bcdUSB =               cpu_to_le16(0x0200),
2215         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
2216         .idVendor =             cpu_to_le16(UAS_VENDOR_ID),
2217         .idProduct =            cpu_to_le16(UAS_PRODUCT_ID),
2218         .iManufacturer =        USB_G_STR_MANUFACTOR,
2219         .iProduct =             USB_G_STR_PRODUCT,
2220         .iSerialNumber =        USB_G_STR_SERIAL,
2221
2222         .bNumConfigurations =   1,
2223 };
2224
2225 static struct usb_string        usbg_us_strings[] = {
2226         { USB_G_STR_MANUFACTOR, "Target Manufactor"},
2227         { USB_G_STR_PRODUCT,    "Target Product"},
2228         { USB_G_STR_SERIAL,     "000000000001"},
2229         { USB_G_STR_CONFIG,     "default config"},
2230         { USB_G_STR_INT_UAS,    "USB Attached SCSI"},
2231         { USB_G_STR_INT_BBB,    "Bulk Only Transport"},
2232         { },
2233 };
2234
2235 static struct usb_gadget_strings usbg_stringtab = {
2236         .language = 0x0409,
2237         .strings = usbg_us_strings,
2238 };
2239
2240 static struct usb_gadget_strings *usbg_strings[] = {
2241         &usbg_stringtab,
2242         NULL,
2243 };
2244
2245 static int guas_unbind(struct usb_composite_dev *cdev)
2246 {
2247         return 0;
2248 }
2249
2250 static struct usb_configuration usbg_config_driver = {
2251         .label                  = "Linux Target",
2252         .bConfigurationValue    = 1,
2253         .iConfiguration         = USB_G_STR_CONFIG,
2254         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
2255 };
2256
2257 static void give_back_ep(struct usb_ep **pep)
2258 {
2259         struct usb_ep *ep = *pep;
2260         if (!ep)
2261                 return;
2262         ep->driver_data = NULL;
2263 }
2264
2265 static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2266 {
2267         struct f_uas            *fu = to_f_uas(f);
2268         struct usb_gadget       *gadget = c->cdev->gadget;
2269         struct usb_ep           *ep;
2270         int                     iface;
2271
2272         iface = usb_interface_id(c, f);
2273         if (iface < 0)
2274                 return iface;
2275
2276         bot_intf_desc.bInterfaceNumber = iface;
2277         uasp_intf_desc.bInterfaceNumber = iface;
2278         fu->iface = iface;
2279         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2280                         &uasp_bi_ep_comp_desc);
2281         if (!ep)
2282                 goto ep_fail;
2283
2284         ep->driver_data = fu;
2285         fu->ep_in = ep;
2286
2287         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2288                         &uasp_bo_ep_comp_desc);
2289         if (!ep)
2290                 goto ep_fail;
2291         ep->driver_data = fu;
2292         fu->ep_out = ep;
2293
2294         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2295                         &uasp_status_in_ep_comp_desc);
2296         if (!ep)
2297                 goto ep_fail;
2298         ep->driver_data = fu;
2299         fu->ep_status = ep;
2300
2301         ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2302                         &uasp_cmd_comp_desc);
2303         if (!ep)
2304                 goto ep_fail;
2305         ep->driver_data = fu;
2306         fu->ep_cmd = ep;
2307
2308         /* Assume endpoint addresses are the same for both speeds */
2309         uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2310         uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2311         uasp_status_desc.bEndpointAddress =
2312                 uasp_ss_status_desc.bEndpointAddress;
2313         uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2314
2315         uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2316         uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2317         uasp_fs_status_desc.bEndpointAddress =
2318                 uasp_ss_status_desc.bEndpointAddress;
2319         uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2320
2321         return 0;
2322 ep_fail:
2323         pr_err("Can't claim all required eps\n");
2324
2325         give_back_ep(&fu->ep_in);
2326         give_back_ep(&fu->ep_out);
2327         give_back_ep(&fu->ep_status);
2328         give_back_ep(&fu->ep_cmd);
2329         return -ENOTSUPP;
2330 }
2331
2332 static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2333 {
2334         struct f_uas *fu = to_f_uas(f);
2335
2336         kfree(fu);
2337 }
2338
2339 struct guas_setup_wq {
2340         struct work_struct work;
2341         struct f_uas *fu;
2342         unsigned int alt;
2343 };
2344
2345 static void usbg_delayed_set_alt(struct work_struct *wq)
2346 {
2347         struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2348                         work);
2349         struct f_uas *fu = work->fu;
2350         int alt = work->alt;
2351
2352         kfree(work);
2353
2354         if (fu->flags & USBG_IS_BOT)
2355                 bot_cleanup_old_alt(fu);
2356         if (fu->flags & USBG_IS_UAS)
2357                 uasp_cleanup_old_alt(fu);
2358
2359         if (alt == USB_G_ALT_INT_BBB)
2360                 bot_set_alt(fu);
2361         else if (alt == USB_G_ALT_INT_UAS)
2362                 uasp_set_alt(fu);
2363         usb_composite_setup_continue(fu->function.config->cdev);
2364 }
2365
2366 static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2367 {
2368         struct f_uas *fu = to_f_uas(f);
2369
2370         if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2371                 struct guas_setup_wq *work;
2372
2373                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2374                 if (!work)
2375                         return -ENOMEM;
2376                 INIT_WORK(&work->work, usbg_delayed_set_alt);
2377                 work->fu = fu;
2378                 work->alt = alt;
2379                 schedule_work(&work->work);
2380                 return USB_GADGET_DELAYED_STATUS;
2381         }
2382         return -EOPNOTSUPP;
2383 }
2384
2385 static void usbg_disable(struct usb_function *f)
2386 {
2387         struct f_uas *fu = to_f_uas(f);
2388
2389         if (fu->flags & USBG_IS_UAS)
2390                 uasp_cleanup_old_alt(fu);
2391         else if (fu->flags & USBG_IS_BOT)
2392                 bot_cleanup_old_alt(fu);
2393         fu->flags = 0;
2394 }
2395
2396 static int usbg_setup(struct usb_function *f,
2397                 const struct usb_ctrlrequest *ctrl)
2398 {
2399         struct f_uas *fu = to_f_uas(f);
2400
2401         if (!(fu->flags & USBG_IS_BOT))
2402                 return -EOPNOTSUPP;
2403
2404         return usbg_bot_setup(f, ctrl);
2405 }
2406
2407 static int usbg_cfg_bind(struct usb_configuration *c)
2408 {
2409         struct f_uas *fu;
2410         int ret;
2411
2412         fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2413         if (!fu)
2414                 return -ENOMEM;
2415         fu->function.name = "Target Function";
2416         fu->function.descriptors = uasp_fs_function_desc;
2417         fu->function.hs_descriptors = uasp_hs_function_desc;
2418         fu->function.ss_descriptors = uasp_ss_function_desc;
2419         fu->function.bind = usbg_bind;
2420         fu->function.unbind = usbg_unbind;
2421         fu->function.set_alt = usbg_set_alt;
2422         fu->function.setup = usbg_setup;
2423         fu->function.disable = usbg_disable;
2424         fu->tpg = the_only_tpg_I_currently_have;
2425
2426         ret = usb_add_function(c, &fu->function);
2427         if (ret)
2428                 goto err;
2429
2430         return 0;
2431 err:
2432         kfree(fu);
2433         return ret;
2434 }
2435
2436 static int usb_target_bind(struct usb_composite_dev *cdev)
2437 {
2438         int ret;
2439
2440         ret = usb_add_config(cdev, &usbg_config_driver,
2441                         usbg_cfg_bind);
2442         return 0;
2443 }
2444
2445 static struct usb_composite_driver usbg_driver = {
2446         .name           = "g_target",
2447         .dev            = &usbg_device_desc,
2448         .strings        = usbg_strings,
2449         .max_speed      = USB_SPEED_SUPER,
2450         .unbind         = guas_unbind,
2451 };
2452
2453 static int usbg_attach(struct usbg_tpg *tpg)
2454 {
2455         return usb_composite_probe(&usbg_driver, usb_target_bind);
2456 }
2457
2458 static void usbg_detach(struct usbg_tpg *tpg)
2459 {
2460         usb_composite_unregister(&usbg_driver);
2461 }
2462
2463 static int __init usb_target_gadget_init(void)
2464 {
2465         int ret;
2466
2467         ret = usbg_register_configfs();
2468         return ret;
2469 }
2470 module_init(usb_target_gadget_init);
2471
2472 static void __exit usb_target_gadget_exit(void)
2473 {
2474         usbg_deregister_configfs();
2475 }
2476 module_exit(usb_target_gadget_exit);
2477
2478 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2479 MODULE_DESCRIPTION("usb-gadget fabric");
2480 MODULE_LICENSE("GPL v2");