drivers/staging/keucr/usb.c

   1 #include <linux/sched.h>
   2 #include <linux/errno.h>
   3 #include <linux/freezer.h>
   4 #include <linux/module.h>
   5 #include <linux/init.h>
   6 #include <linux/slab.h>
   7 #include <linux/kthread.h>
   8 #include <linux/mutex.h>
   9 #include <linux/utsname.h>
  10
  11 #include <scsi/scsi.h>
  12 #include <scsi/scsi_cmnd.h>
  13 #include <scsi/scsi_device.h>
  14
  15 #include "usb.h"
  16 #include "scsiglue.h"
  17 #include "smil.h"
  18 #include "transport.h"
  19
  20 /* Some informational data */
  21 MODULE_AUTHOR("Domao");
  22 MODULE_DESCRIPTION("ENE USB Mass Storage driver for Linux");
  23 MODULE_LICENSE("GPL");
  24
  25 static unsigned int delay_use = 1;
  26
  27 static struct usb_device_id eucr_usb_ids [] = {
  28         { USB_DEVICE(0x058f, 0x6366) },
  29         { USB_DEVICE(0x0cf2, 0x6230) },
  30         { USB_DEVICE(0x0cf2, 0x6250) },
  31         { }                                            /* Terminating entry */
  32 };
  33 MODULE_DEVICE_TABLE (usb, eucr_usb_ids);
  34
  35
  36 #ifdef CONFIG_PM
  37
  38 static int eucr_suspend(struct usb_interface *iface, pm_message_t message)
  39 {
  40         struct us_data *us = usb_get_intfdata(iface);
  41         pr_info("--- eucr_suspend ---\n");
  42         /* Wait until no command is running */
  43         mutex_lock(&us->dev_mutex);
  44
  45         if (us->suspend_resume_hook)
  46                 (us->suspend_resume_hook)(us, US_SUSPEND);
  47
  48         mutex_unlock(&us->dev_mutex);
  49         return 0;
  50 }
  51
  52 static int eucr_resume(struct usb_interface *iface)
  53 {
  54         BYTE    tmp = 0;
  55
  56         struct us_data *us = usb_get_intfdata(iface);
  57         pr_info("--- eucr_resume---\n");
  58         mutex_lock(&us->dev_mutex);
  59
  60         if (us->suspend_resume_hook)
  61                 (us->suspend_resume_hook)(us, US_RESUME);
  62
  63
  64         mutex_unlock(&us->dev_mutex);
  65
  66         us->Power_IsResum = true;
  67
  68         us->SM_Status = *(PSM_STATUS)&tmp;
  69
  70         return 0;
  71 }
  72
  73 static int eucr_reset_resume(struct usb_interface *iface)
  74 {
  75         BYTE    tmp = 0;
  76         struct us_data *us = usb_get_intfdata(iface);
  77
  78         pr_info("--- eucr_reset_resume---\n");
  79
  80         /* Report the reset to the SCSI core */
  81         usb_stor_report_bus_reset(us);
  82
  83         /*
  84          * FIXME: Notify the subdrivers that they need to reinitialize
  85          * the device
  86          */
  87
  88         us->Power_IsResum = true;
  89
  90         us->SM_Status = *(PSM_STATUS)&tmp;
  91
  92         return 0;
  93 }
  94
  95 #else
  96
  97 #define eucr_suspend            NULL
  98 #define eucr_resume             NULL
  99 #define eucr_reset_resume       NULL
 100
 101 #endif
 102
 103 static int eucr_pre_reset(struct usb_interface *iface)
 104 {
 105         struct us_data *us = usb_get_intfdata(iface);
 106
 107         pr_info("usb --- eucr_pre_reset\n");
 108
 109         /* Make sure no command runs during the reset */
 110         mutex_lock(&us->dev_mutex);
 111         return 0;
 112 }
 113
 114 static int eucr_post_reset(struct usb_interface *iface)
 115 {
 116         struct us_data *us = usb_get_intfdata(iface);
 117
 118         pr_info("usb --- eucr_post_reset\n");
 119
 120         /* Report the reset to the SCSI core */
 121         usb_stor_report_bus_reset(us);
 122
 123         mutex_unlock(&us->dev_mutex);
 124         return 0;
 125 }
 126
 127 void fill_inquiry_response(struct us_data *us, unsigned char *data, unsigned int data_len)
 128 {
 129         pr_info("usb --- fill_inquiry_response\n");
 130         if (data_len < 36) /* You lose. */
 131                 return;
 132
 133         if (data[0]&0x20) {
 134                 memset(data+8,0,28);
 135         } else {
 136                 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
 137                 memcpy(data+8, us->unusual_dev->vendorName,
 138                         strlen(us->unusual_dev->vendorName) > 8 ? 8 :
 139                         strlen(us->unusual_dev->vendorName));
 140                 memcpy(data+16, us->unusual_dev->productName,
 141                         strlen(us->unusual_dev->productName) > 16 ? 16 :
 142                         strlen(us->unusual_dev->productName));
 143                 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
 144                 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
 145                 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
 146                 data[35] = 0x30 + ((bcdDevice) & 0x0F);
 147         }
 148         usb_stor_set_xfer_buf(us, data, data_len, us->srb, TO_XFER_BUF);
 149 }
 150
 151 static int usb_stor_control_thread(void * __us)
 152 {
 153         struct us_data *us = (struct us_data *)__us;
 154         struct Scsi_Host *host = us_to_host(us);
 155
 156         pr_info("usb --- usb_stor_control_thread\n");
 157         for (;;) {
 158                 if (wait_for_completion_interruptible(&us->cmnd_ready))
 159                         break;
 160
 161                 /* lock the device pointers */
 162                 mutex_lock(&(us->dev_mutex));
 163
 164                 /* if the device has disconnected, we are free to exit */
 165                 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
 166                         mutex_unlock(&us->dev_mutex);
 167                         break;
 168                 }
 169
 170                 /* lock access to the state */
 171                 scsi_lock(host);
 172
 173                 /* When we are called with no command pending, we're done */
 174                 if (us->srb == NULL) {
 175                         scsi_unlock(host);
 176                         mutex_unlock(&us->dev_mutex);
 177                         break;
 178                 }
 179
 180                 /* has the command timed out *already* ? */
 181                 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 182                         us->srb->result = DID_ABORT << 16;
 183                         goto SkipForAbort;
 184                 }
 185
 186                 scsi_unlock(host);
 187
 188                 if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
 189                         us->srb->result = DID_ERROR << 16;
 190                 } else if (us->srb->device->id
 191                            && !(us->fflags & US_FL_SCM_MULT_TARG)) {
 192                         us->srb->result = DID_BAD_TARGET << 16;
 193                 } else if (us->srb->device->lun > us->max_lun) {
 194                         us->srb->result = DID_BAD_TARGET << 16;
 195                 } else if ((us->srb->cmnd[0] == INQUIRY)
 196                            && (us->fflags & US_FL_FIX_INQUIRY)) {
 197                         unsigned char data_ptr[36] = {0x00, 0x80, 0x02, 0x02, 0x1F, 0x00, 0x00, 0x00};
 198
 199                         fill_inquiry_response(us, data_ptr, 36);
 200                         us->srb->result = SAM_STAT_GOOD;
 201                 } else {
 202                         us->proto_handler(us->srb, us);
 203                 }
 204
 205                 /* lock access to the state */
 206                 scsi_lock(host);
 207
 208                 /* indicate that the command is done */
 209                 if (us->srb->result != DID_ABORT << 16) {
 210                         us->srb->scsi_done(us->srb);
 211                 } else {
 212 SkipForAbort:
 213                         pr_info("scsi command aborted\n");
 214                 }
 215
 216                 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 217                         complete(&(us->notify));
 218
 219                         /* Allow USB transfers to resume */
 220                         clear_bit(US_FLIDX_ABORTING, &us->dflags);
 221                         clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
 222                 }
 223
 224                 /* finished working on this command */
 225                 us->srb = NULL;
 226                 scsi_unlock(host);
 227
 228                 /* unlock the device pointers */
 229                 mutex_unlock(&us->dev_mutex);
 230         } /* for (;;) */
 231
 232         /* Wait until we are told to stop */
 233         for (;;) {
 234                 set_current_state(TASK_INTERRUPTIBLE);
 235                 if (kthread_should_stop())
 236                         break;
 237                 schedule();
 238         }
 239         __set_current_state(TASK_RUNNING);
 240         return 0;
 241 }
 242
 243 static int associate_dev(struct us_data *us, struct usb_interface *intf)
 244 {
 245         pr_info("usb --- associate_dev\n");
 246
 247         /* Fill in the device-related fields */
 248         us->pusb_dev = interface_to_usbdev(intf);
 249         us->pusb_intf = intf;
 250         us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 251
 252         /* Store our private data in the interface */
 253         usb_set_intfdata(intf, us);
 254
 255         /* Allocate the device-related DMA-mapped buffers */
 256         us->cr = usb_alloc_coherent(us->pusb_dev, sizeof(*us->cr), GFP_KERNEL, &us->cr_dma);
 257         if (!us->cr) {
 258                 pr_info("usb_ctrlrequest allocation failed\n");
 259                 return -ENOMEM;
 260         }
 261
 262         us->iobuf = usb_alloc_coherent(us->pusb_dev, US_IOBUF_SIZE, GFP_KERNEL, &us->iobuf_dma);
 263         if (!us->iobuf) {
 264                 pr_info("I/O buffer allocation failed\n");
 265                 return -ENOMEM;
 266         }
 267
 268         us->sensebuf = kmalloc(US_SENSE_SIZE, GFP_KERNEL);
 269         if (!us->sensebuf)
 270                 return -ENOMEM;
 271
 272         return 0;
 273 }
 274
 275 static int get_device_info(struct us_data *us, const struct usb_device_id *id)
 276 {
 277         struct usb_device *dev = us->pusb_dev;
 278         struct usb_interface_descriptor *idesc = &us->pusb_intf->cur_altsetting->desc;
 279
 280         pr_info("usb --- get_device_info\n");
 281
 282         us->subclass = idesc->bInterfaceSubClass;
 283         us->protocol = idesc->bInterfaceProtocol;
 284         us->fflags = id->driver_info;
 285         us->Power_IsResum = false;
 286
 287         if (us->fflags & US_FL_IGNORE_DEVICE) {
 288                 pr_info("device ignored\n");
 289                 return -ENODEV;
 290         }
 291
 292         if (dev->speed != USB_SPEED_HIGH)
 293                 us->fflags &= ~US_FL_GO_SLOW;
 294
 295         return 0;
 296 }
 297
 298 static int get_transport(struct us_data *us)
 299 {
 300         pr_info("usb --- get_transport\n");
 301         switch (us->protocol) {
 302         case USB_PR_BULK:
 303                 us->transport_name = "Bulk";
 304                 us->transport = usb_stor_Bulk_transport;
 305                 us->transport_reset = usb_stor_Bulk_reset;
 306                 break;
 307
 308         default:
 309                 return -EIO;
 310         }
 311
 312         /* fix for single-lun devices */
 313         if (us->fflags & US_FL_SINGLE_LUN)
 314                 us->max_lun = 0;
 315         return 0;
 316 }
 317
 318 static int get_protocol(struct us_data *us)
 319 {
 320         pr_info("usb --- get_protocol\n");
 321         pr_info("us->pusb_dev->descriptor.idVendor = %x\n",
 322                         us->pusb_dev->descriptor.idVendor);
 323         pr_info("us->pusb_dev->descriptor.idProduct = %x\n",
 324                         us->pusb_dev->descriptor.idProduct);
 325         switch (us->subclass) {
 326         case USB_SC_SCSI:
 327                 us->protocol_name = "Transparent SCSI";
 328                 if ((us->pusb_dev->descriptor.idVendor == 0x0CF2)
 329                     && (us->pusb_dev->descriptor.idProduct == 0x6250))
 330                         us->proto_handler = ENE_stor_invoke_transport;
 331                 else
 332                         us->proto_handler = usb_stor_invoke_transport;
 333                 break;
 334
 335         default:
 336                 return -EIO;
 337         }
 338         return 0;
 339 }
 340
 341 static int get_pipes(struct us_data *us)
 342 {
 343         struct usb_host_interface *altsetting = us->pusb_intf->cur_altsetting;
 344         int i;
 345         struct usb_endpoint_descriptor *ep;
 346         struct usb_endpoint_descriptor *ep_in = NULL;
 347         struct usb_endpoint_descriptor *ep_out = NULL;
 348         struct usb_endpoint_descriptor *ep_int = NULL;
 349
 350         pr_info("usb --- get_pipes\n");
 351
 352         for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
 353                 ep = &altsetting->endpoint[i].desc;
 354
 355                 if (usb_endpoint_xfer_bulk(ep)) {
 356                         if (usb_endpoint_dir_in(ep)) {
 357                                 if (!ep_in)
 358                                         ep_in = ep;
 359                         } else {
 360                                 if (!ep_out)
 361                                         ep_out = ep;
 362                         }
 363                 } else if (usb_endpoint_is_int_in(ep)) {
 364                         if (!ep_int)
 365                                 ep_int = ep;
 366                 }
 367         }
 368
 369         if (!ep_in || !ep_out || (us->protocol == USB_PR_CBI && !ep_int)) {
 370                 pr_info("Endpoint sanity check failed! Rejecting dev.\n");
 371                 return -EIO;
 372         }
 373
 374         /* Calculate and store the pipe values */
 375         us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
 376         us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
 377         us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev, ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 378         us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev, ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 379         if (ep_int) {
 380                 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev, ep_int->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 381                 us->ep_bInterval = ep_int->bInterval;
 382         }
 383         return 0;
 384 }
 385
 386 static int usb_stor_acquire_resources(struct us_data *us)
 387 {
 388         struct task_struct *th;
 389
 390         pr_info("usb --- usb_stor_acquire_resources\n");
 391         us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
 392         if (!us->current_urb) {
 393                 pr_info("URB allocation failed\n");
 394                 return -ENOMEM;
 395         }
 396
 397         /* Start up our control thread */
 398         th = kthread_run(usb_stor_control_thread, us, "eucr-storage");
 399         if (IS_ERR(th)) {
 400                 pr_info("Unable to start control thread\n");
 401                 return PTR_ERR(th);
 402         }
 403         us->ctl_thread = th;
 404
 405         return 0;
 406 }
 407
 408 static void usb_stor_release_resources(struct us_data *us)
 409 {
 410         pr_info("usb --- usb_stor_release_resources\n");
 411
 412         SM_FreeMem();
 413
 414         complete(&us->cmnd_ready);
 415         if (us->ctl_thread)
 416                 kthread_stop(us->ctl_thread);
 417
 418         /* Call the destructor routine, if it exists */
 419         if (us->extra_destructor) {
 420                 pr_info("-- calling extra_destructor()\n");
 421                 us->extra_destructor(us->extra);
 422         }
 423
 424         /* Free the extra data and the URB */
 425         kfree(us->extra);
 426         usb_free_urb(us->current_urb);
 427 }
 428
 429 static void dissociate_dev(struct us_data *us)
 430 {
 431         pr_info("usb --- dissociate_dev\n");
 432
 433         kfree(us->sensebuf);
 434
 435         /* Free the device-related DMA-mapped buffers */
 436         if (us->cr)
 437                 usb_free_coherent(us->pusb_dev, sizeof(*us->cr), us->cr, us->cr_dma);
 438         if (us->iobuf)
 439                 usb_free_coherent(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma);
 440
 441         /* Remove our private data from the interface */
 442         usb_set_intfdata(us->pusb_intf, NULL);
 443 }
 444
 445 static void quiesce_and_remove_host(struct us_data *us)
 446 {
 447         struct Scsi_Host *host = us_to_host(us);
 448
 449         pr_info("usb --- quiesce_and_remove_host\n");
 450
 451         /* If the device is really gone, cut short reset delays */
 452         if (us->pusb_dev->state == USB_STATE_NOTATTACHED)
 453                 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 454
 455         /*
 456          * Prevent SCSI-scanning (if it hasn't started yet)
 457          * and wait for the SCSI-scanning thread to stop.
 458          */
 459         set_bit(US_FLIDX_DONT_SCAN, &us->dflags);
 460         wake_up(&us->delay_wait);
 461         wait_for_completion(&us->scanning_done);
 462
 463         /*
 464          * Removing the host will perform an orderly shutdown: caches
 465          * synchronized, disks spun down, etc.
 466          */
 467         scsi_remove_host(host);
 468
 469         /*
 470          * Prevent any new commands from being accepted and cut short
 471          * reset delays.
 472          */
 473         scsi_lock(host);
 474         set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 475         scsi_unlock(host);
 476         wake_up(&us->delay_wait);
 477 }
 478
 479 static void release_everything(struct us_data *us)
 480 {
 481         pr_info("usb --- release_everything\n");
 482
 483         usb_stor_release_resources(us);
 484         dissociate_dev(us);
 485         scsi_host_put(us_to_host(us));
 486 }
 487
 488 static int usb_stor_scan_thread(void * __us)
 489 {
 490         struct us_data *us = (struct us_data *)__us;
 491
 492         pr_info("usb --- usb_stor_scan_thread\n");
 493         pr_info("EUCR : device found at %d\n", us->pusb_dev->devnum);
 494
 495         set_freezable();
 496         /* Wait for the timeout to expire or for a disconnect */
 497         if (delay_use > 0) {
 498                 wait_event_freezable_timeout(us->delay_wait,
 499                                 test_bit(US_FLIDX_DONT_SCAN, &us->dflags),
 500                                 delay_use * HZ);
 501         }
 502
 503         /* If the device is still connected, perform the scanning */
 504         if (!test_bit(US_FLIDX_DONT_SCAN, &us->dflags)) {
 505                 /* For bulk-only devices, determine the max LUN value */
 506                 if (us->protocol == USB_PR_BULK
 507                     && !(us->fflags & US_FL_SINGLE_LUN)) {
 508                         mutex_lock(&us->dev_mutex);
 509                         us->max_lun = usb_stor_Bulk_max_lun(us);
 510                         mutex_unlock(&us->dev_mutex);
 511                 }
 512                 scsi_scan_host(us_to_host(us));
 513                 pr_info("EUCR : device scan complete\n");
 514         }
 515         complete_and_exit(&us->scanning_done, 0);
 516 }
 517
 518 static int eucr_probe(struct usb_interface *intf, const struct usb_device_id *id)
 519 {
 520         struct Scsi_Host *host;
 521         struct us_data *us;
 522         int result;
 523         BYTE    MiscReg03 = 0;
 524         struct task_struct *th;
 525
 526         pr_info("usb --- eucr_probe\n");
 527
 528       host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us));
 529         if (!host) {
 530                 pr_info("Unable to allocate the scsi host\n");
 531                 return -ENOMEM;
 532         }
 533
 534         /* Allow 16-byte CDBs and thus > 2TB */
 535         host->max_cmd_len = 16;
 536         us = host_to_us(host);
 537         memset(us, 0, sizeof(struct us_data));
 538         mutex_init(&(us->dev_mutex));
 539         init_completion(&us->cmnd_ready);
 540         init_completion(&(us->notify));
 541         init_waitqueue_head(&us->delay_wait);
 542         init_completion(&us->scanning_done);
 543
 544         /* Associate the us_data structure with the USB device */
 545         result = associate_dev(us, intf);
 546         if (result)
 547                 goto BadDevice;
 548
 549         /* Get Device info */
 550         result = get_device_info(us, id);
 551         if (result)
 552                 goto BadDevice;
 553
 554         /* Get the transport, protocol, and pipe settings */
 555         result = get_transport(us);
 556         if (result)
 557                 goto BadDevice;
 558         result = get_protocol(us);
 559         if (result)
 560                 goto BadDevice;
 561         result = get_pipes(us);
 562         if (result)
 563                 goto BadDevice;
 564
 565         /* Acquire all the other resources and add the host */
 566         result = usb_stor_acquire_resources(us);
 567         if (result)
 568                 goto BadDevice;
 569
 570         result = scsi_add_host(host, &intf->dev);
 571         if (result) {
 572                 pr_info("Unable to add the scsi host\n");
 573                 goto BadDevice;
 574         }
 575
 576         /* Start up the thread for delayed SCSI-device scanning */
 577         th = kthread_create(usb_stor_scan_thread, us, "eucr-stor-scan");
 578         if (IS_ERR(th)) {
 579                 pr_info("Unable to start the device-scanning thread\n");
 580                 complete(&us->scanning_done);
 581                 quiesce_and_remove_host(us);
 582                 result = PTR_ERR(th);
 583                 goto BadDevice;
 584         }
 585         wake_up_process(th);
 586
 587         /* probe card type */
 588         result = ENE_Read_BYTE(us, REG_CARD_STATUS, &MiscReg03);
 589         if (result != USB_STOR_XFER_GOOD) {
 590                 result = USB_STOR_TRANSPORT_ERROR;
 591                 quiesce_and_remove_host(us);
 592                 goto BadDevice;
 593         }
 594
 595         if (!(MiscReg03 & 0x02)) {
 596                 result = -ENODEV;
 597                 quiesce_and_remove_host(us);
 598                 pr_info("keucr: The driver only supports SM/MS card.\
 599                         To use SD card, \
 600                         please build driver/usb/storage/ums-eneub6250.ko\n");
 601                 goto BadDevice;
 602         }
 603
 604         return 0;
 605
 606         /* We come here if there are any problems */
 607 BadDevice:
 608         pr_info("usb --- eucr_probe failed\n");
 609         release_everything(us);
 610         return result;
 611 }
 612
 613 static void eucr_disconnect(struct usb_interface *intf)
 614 {
 615         struct us_data *us = usb_get_intfdata(intf);
 616
 617         pr_info("usb --- eucr_disconnect\n");
 618         quiesce_and_remove_host(us);
 619         release_everything(us);
 620 }
 621
 622 /* Initialization and registration */
 623 static struct usb_driver usb_storage_driver = {
 624         .name =         "eucr",
 625         .probe =                eucr_probe,
 626         .suspend =          eucr_suspend,
 627         .resume =           eucr_resume,
 628         .reset_resume = eucr_reset_resume,
 629         .disconnect =   eucr_disconnect,
 630         .pre_reset =    eucr_pre_reset,
 631         .post_reset =   eucr_post_reset,
 632         .id_table =             eucr_usb_ids,
 633         .soft_unbind =  1,
 634 };
 635
 636 module_usb_driver(usb_storage_driver);