drivers/staging/greybus/es1.c

   1 /*
   2  * Greybus "AP" USB driver for "ES1" controller chips
   3  *
   4  * Copyright 2014-2015 Google Inc.
   5  * Copyright 2014-2015 Linaro Ltd.
   6  *
   7  * Released under the GPLv2 only.
   8  */
   9 #include <linux/kthread.h>
  10 #include <linux/sizes.h>
  11 #include <linux/usb.h>
  12 #include <linux/kfifo.h>
  13 #include <linux/debugfs.h>
  14 #include <asm/unaligned.h>
  15
  16 #include "greybus.h"
  17 #include "kernel_ver.h"
  18
  19 /* Memory sizes for the buffers sent to/from the ES1 controller */
  20 #define ES1_GBUF_MSG_SIZE_MAX   2048
  21
  22 static const struct usb_device_id id_table[] = {
  23         /* Made up numbers for the SVC USB Bridge in ES1 */
  24         { USB_DEVICE(0xffff, 0x0001) },
  25         { },
  26 };
  27 MODULE_DEVICE_TABLE(usb, id_table);
  28
  29 #define APB1_LOG_SIZE           SZ_16K
  30 static struct dentry *apb1_log_dentry;
  31 static struct dentry *apb1_log_enable_dentry;
  32 static struct task_struct *apb1_log_task;
  33 static DEFINE_KFIFO(apb1_log_fifo, char, APB1_LOG_SIZE);
  34
  35 /*
  36  * Number of CPort IN urbs in flight at any point in time.
  37  * Adjust if we are having stalls in the USB buffer due to not enough urbs in
  38  * flight.
  39  */
  40 #define NUM_CPORT_IN_URB        4
  41
  42 /* Number of CPort OUT urbs in flight at any point in time.
  43  * Adjust if we get messages saying we are out of urbs in the system log.
  44  */
  45 #define NUM_CPORT_OUT_URB       8
  46
  47 /* vendor request AP message */
  48 #define REQUEST_SVC             0x01
  49
  50 /* vendor request APB1 log */
  51 #define REQUEST_LOG             0x02
  52
  53 /**
  54  * es1_ap_dev - ES1 USB Bridge to AP structure
  55  * @usb_dev: pointer to the USB device we are.
  56  * @usb_intf: pointer to the USB interface we are bound to.
  57  * @hd: pointer to our greybus_host_device structure
  58  * @control_endpoint: endpoint to send data to SVC
  59  * @cport_in_endpoint: bulk in endpoint for CPort data
  60  * @cport-out_endpoint: bulk out endpoint for CPort data
  61  * @cport_in_urb: array of urbs for the CPort in messages
  62  * @cport_in_buffer: array of buffers for the @cport_in_urb urbs
  63  * @cport_out_urb: array of urbs for the CPort out messages
  64  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
  65  *                      not.
  66  * @cport_out_urb_cancelled: array of flags indicating whether the
  67  *                      corresponding @cport_out_urb is being cancelled
  68  * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
  69  */
  70 struct es1_ap_dev {
  71         struct usb_device *usb_dev;
  72         struct usb_interface *usb_intf;
  73         struct greybus_host_device *hd;
  74
  75         __u8 control_endpoint;
  76         __u8 cport_in_endpoint;
  77         __u8 cport_out_endpoint;
  78
  79         struct urb *cport_in_urb[NUM_CPORT_IN_URB];
  80         u8 *cport_in_buffer[NUM_CPORT_IN_URB];
  81         struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
  82         bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
  83         bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
  84         spinlock_t cport_out_urb_lock;
  85 };
  86
  87 static inline struct es1_ap_dev *hd_to_es1(struct greybus_host_device *hd)
  88 {
  89         return (struct es1_ap_dev *)&hd->hd_priv;
  90 }
  91
  92 static void cport_out_callback(struct urb *urb);
  93 static void usb_log_enable(struct es1_ap_dev *es1);
  94 static void usb_log_disable(struct es1_ap_dev *es1);
  95
  96 #define ES1_TIMEOUT     500     /* 500 ms for the SVC to do something */
  97
  98 static struct urb *next_free_urb(struct es1_ap_dev *es1, gfp_t gfp_mask)
  99 {
 100         struct urb *urb = NULL;
 101         unsigned long flags;
 102         int i;
 103
 104         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 105
 106         /* Look in our pool of allocated urbs first, as that's the "fastest" */
 107         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 108                 if (es1->cport_out_urb_busy[i] == false &&
 109                                 es1->cport_out_urb_cancelled[i] == false) {
 110                         es1->cport_out_urb_busy[i] = true;
 111                         urb = es1->cport_out_urb[i];
 112                         break;
 113                 }
 114         }
 115         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 116         if (urb)
 117                 return urb;
 118
 119         /*
 120          * Crap, pool is empty, complain to the syslog and go allocate one
 121          * dynamically as we have to succeed.
 122          */
 123         dev_err(&es1->usb_dev->dev,
 124                 "No free CPort OUT urbs, having to dynamically allocate one!\n");
 125         return usb_alloc_urb(0, gfp_mask);
 126 }
 127
 128 static void free_urb(struct es1_ap_dev *es1, struct urb *urb)
 129 {
 130         unsigned long flags;
 131         int i;
 132         /*
 133          * See if this was an urb in our pool, if so mark it "free", otherwise
 134          * we need to free it ourselves.
 135          */
 136         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 137         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 138                 if (urb == es1->cport_out_urb[i]) {
 139                         es1->cport_out_urb_busy[i] = false;
 140                         urb = NULL;
 141                         break;
 142                 }
 143         }
 144         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 145
 146         /* If urb is not NULL, then we need to free this urb */
 147         usb_free_urb(urb);
 148 }
 149
 150 /*
 151  * We (ab)use the operation-message header pad bytes to transfer the
 152  * cport id in order to minimise overhead.
 153  */
 154 static void
 155 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
 156 {
 157         header->pad[0] = cport_id;
 158 }
 159
 160 /* Clear the pad bytes used for the CPort id */
 161 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
 162 {
 163         header->pad[0] = 0;
 164 }
 165
 166 /* Extract the CPort id packed into the header, and clear it */
 167 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
 168 {
 169         u16 cport_id = header->pad[0];
 170
 171         gb_message_cport_clear(header);
 172
 173         return cport_id;
 174 }
 175
 176 /*
 177  * Returns zero if the message was successfully queued, or a negative errno
 178  * otherwise.
 179  */
 180 static int message_send(struct greybus_host_device *hd, u16 cport_id,
 181                         struct gb_message *message, gfp_t gfp_mask)
 182 {
 183         struct es1_ap_dev *es1 = hd_to_es1(hd);
 184         struct usb_device *udev = es1->usb_dev;
 185         size_t buffer_size;
 186         int retval;
 187         struct urb *urb;
 188         unsigned long flags;
 189
 190         /*
 191          * The data actually transferred will include an indication
 192          * of where the data should be sent.  Do one last check of
 193          * the target CPort id before filling it in.
 194          */
 195         if (!cport_id_valid(cport_id)) {
 196                 pr_err("invalid destination cport 0x%02x\n", cport_id);
 197                 return -EINVAL;
 198         }
 199
 200         /* Find a free urb */
 201         urb = next_free_urb(es1, gfp_mask);
 202         if (!urb)
 203                 return -ENOMEM;
 204
 205         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 206         message->hcpriv = urb;
 207         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 208
 209         /* Pack the cport id into the message header */
 210         gb_message_cport_pack(message->header, cport_id);
 211
 212         buffer_size = sizeof(*message->header) + message->payload_size;
 213
 214         usb_fill_bulk_urb(urb, udev,
 215                           usb_sndbulkpipe(udev, es1->cport_out_endpoint),
 216                           message->buffer, buffer_size,
 217                           cport_out_callback, message);
 218         retval = usb_submit_urb(urb, gfp_mask);
 219         if (retval) {
 220                 pr_err("error %d submitting URB\n", retval);
 221
 222                 spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 223                 message->hcpriv = NULL;
 224                 spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 225
 226                 free_urb(es1, urb);
 227                 gb_message_cport_clear(message->header);
 228
 229                 return retval;
 230         }
 231
 232         return 0;
 233 }
 234
 235 /*
 236  * Can not be called in atomic context.
 237  */
 238 static void message_cancel(struct gb_message *message)
 239 {
 240         struct greybus_host_device *hd = message->operation->connection->hd;
 241         struct es1_ap_dev *es1 = hd_to_es1(hd);
 242         struct urb *urb;
 243         int i;
 244
 245         might_sleep();
 246
 247         spin_lock_irq(&es1->cport_out_urb_lock);
 248         urb = message->hcpriv;
 249
 250         /* Prevent dynamically allocated urb from being deallocated. */
 251         usb_get_urb(urb);
 252
 253         /* Prevent pre-allocated urb from being reused. */
 254         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 255                 if (urb == es1->cport_out_urb[i]) {
 256                         es1->cport_out_urb_cancelled[i] = true;
 257                         break;
 258                 }
 259         }
 260         spin_unlock_irq(&es1->cport_out_urb_lock);
 261
 262         usb_kill_urb(urb);
 263
 264         if (i < NUM_CPORT_OUT_URB) {
 265                 spin_lock_irq(&es1->cport_out_urb_lock);
 266                 es1->cport_out_urb_cancelled[i] = false;
 267                 spin_unlock_irq(&es1->cport_out_urb_lock);
 268         }
 269
 270         usb_free_urb(urb);
 271 }
 272
 273 static struct greybus_host_driver es1_driver = {
 274         .hd_priv_size           = sizeof(struct es1_ap_dev),
 275         .message_send           = message_send,
 276         .message_cancel         = message_cancel,
 277 };
 278
 279 /* Common function to report consistent warnings based on URB status */
 280 static int check_urb_status(struct urb *urb)
 281 {
 282         struct device *dev = &urb->dev->dev;
 283         int status = urb->status;
 284
 285         switch (status) {
 286         case 0:
 287                 return 0;
 288
 289         case -EOVERFLOW:
 290                 dev_err(dev, "%s: overflow actual length is %d\n",
 291                         __func__, urb->actual_length);
 292         case -ECONNRESET:
 293         case -ENOENT:
 294         case -ESHUTDOWN:
 295         case -EILSEQ:
 296         case -EPROTO:
 297                 /* device is gone, stop sending */
 298                 return status;
 299         }
 300         dev_err(dev, "%s: unknown status %d\n", __func__, status);
 301
 302         return -EAGAIN;
 303 }
 304
 305 static void ap_disconnect(struct usb_interface *interface)
 306 {
 307         struct es1_ap_dev *es1;
 308         struct usb_device *udev;
 309         int i;
 310
 311         es1 = usb_get_intfdata(interface);
 312         if (!es1)
 313                 return;
 314
 315         usb_log_disable(es1);
 316
 317         /* Tear down everything! */
 318         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 319                 struct urb *urb = es1->cport_out_urb[i];
 320
 321                 if (!urb)
 322                         break;
 323                 usb_kill_urb(urb);
 324                 usb_free_urb(urb);
 325                 es1->cport_out_urb[i] = NULL;
 326                 es1->cport_out_urb_busy[i] = false;     /* just to be anal */
 327         }
 328
 329         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 330                 struct urb *urb = es1->cport_in_urb[i];
 331
 332                 if (!urb)
 333                         break;
 334                 usb_kill_urb(urb);
 335                 usb_free_urb(urb);
 336                 kfree(es1->cport_in_buffer[i]);
 337                 es1->cport_in_buffer[i] = NULL;
 338         }
 339
 340         usb_set_intfdata(interface, NULL);
 341         udev = es1->usb_dev;
 342         greybus_remove_hd(es1->hd);
 343
 344         usb_put_dev(udev);
 345 }
 346
 347 static void cport_in_callback(struct urb *urb)
 348 {
 349         struct greybus_host_device *hd = urb->context;
 350         struct device *dev = &urb->dev->dev;
 351         struct gb_operation_msg_hdr *header;
 352         int status = check_urb_status(urb);
 353         int retval;
 354         u16 cport_id;
 355
 356         if (status) {
 357                 if ((status == -EAGAIN) || (status == -EPROTO))
 358                         goto exit;
 359                 dev_err(dev, "urb cport in error %d (dropped)\n", status);
 360                 return;
 361         }
 362
 363         if (urb->actual_length < sizeof(*header)) {
 364                 dev_err(dev, "%s: short message received\n", __func__);
 365                 goto exit;
 366         }
 367
 368         /* Extract the CPort id, which is packed in the message header */
 369         header = urb->transfer_buffer;
 370         cport_id = gb_message_cport_unpack(header);
 371
 372         if (cport_id_valid(cport_id))
 373                 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
 374                                                         urb->actual_length);
 375         else
 376                 dev_err(dev, "%s: invalid cport id 0x%02x received\n",
 377                                 __func__, cport_id);
 378 exit:
 379         /* put our urb back in the request pool */
 380         retval = usb_submit_urb(urb, GFP_ATOMIC);
 381         if (retval)
 382                 dev_err(dev, "%s: error %d in submitting urb.\n",
 383                         __func__, retval);
 384 }
 385
 386 static void cport_out_callback(struct urb *urb)
 387 {
 388         struct gb_message *message = urb->context;
 389         struct greybus_host_device *hd = message->operation->connection->hd;
 390         struct es1_ap_dev *es1 = hd_to_es1(hd);
 391         int status = check_urb_status(urb);
 392         unsigned long flags;
 393
 394         gb_message_cport_clear(message->header);
 395
 396         /*
 397          * Tell the submitter that the message send (attempt) is
 398          * complete, and report the status.
 399          */
 400         greybus_message_sent(hd, message, status);
 401
 402         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 403         message->hcpriv = NULL;
 404         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 405
 406         free_urb(es1, urb);
 407 }
 408
 409 #define APB1_LOG_MSG_SIZE       64
 410 static void apb1_log_get(struct es1_ap_dev *es1, char *buf)
 411 {
 412         int retval;
 413
 414         /* SVC messages go down our control pipe */
 415         do {
 416                 retval = usb_control_msg(es1->usb_dev,
 417                                         usb_rcvctrlpipe(es1->usb_dev,
 418                                                         es1->control_endpoint),
 419                                         REQUEST_LOG,
 420                                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 421                                         0x00, 0x00,
 422                                         buf,
 423                                         APB1_LOG_MSG_SIZE,
 424                                         ES1_TIMEOUT);
 425                 if (retval > 0)
 426                         kfifo_in(&apb1_log_fifo, buf, retval);
 427         } while (retval > 0);
 428 }
 429
 430 static int apb1_log_poll(void *data)
 431 {
 432         struct es1_ap_dev *es1 = data;
 433         char *buf;
 434
 435         buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
 436         if (!buf)
 437                 return -ENOMEM;
 438
 439         while (!kthread_should_stop()) {
 440                 msleep(1000);
 441                 apb1_log_get(es1, buf);
 442         }
 443
 444         kfree(buf);
 445
 446         return 0;
 447 }
 448
 449 static ssize_t apb1_log_read(struct file *f, char __user *buf,
 450                                 size_t count, loff_t *ppos)
 451 {
 452         ssize_t ret;
 453         size_t copied;
 454         char *tmp_buf;
 455
 456         if (count > APB1_LOG_SIZE)
 457                 count = APB1_LOG_SIZE;
 458
 459         tmp_buf = kmalloc(count, GFP_KERNEL);
 460         if (!tmp_buf)
 461                 return -ENOMEM;
 462
 463         copied = kfifo_out(&apb1_log_fifo, tmp_buf, count);
 464         ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
 465
 466         kfree(tmp_buf);
 467
 468         return ret;
 469 }
 470
 471 static const struct file_operations apb1_log_fops = {
 472         .read   = apb1_log_read,
 473 };
 474
 475 static void usb_log_enable(struct es1_ap_dev *es1)
 476 {
 477         if (!IS_ERR_OR_NULL(apb1_log_task))
 478                 return;
 479
 480         /* get log from APB1 */
 481         apb1_log_task = kthread_run(apb1_log_poll, es1, "apb1_log");
 482         if (IS_ERR(apb1_log_task))
 483                 return;
 484         apb1_log_dentry = debugfs_create_file("apb1_log", S_IRUGO,
 485                                                 gb_debugfs_get(), NULL,
 486                                                 &apb1_log_fops);
 487 }
 488
 489 static void usb_log_disable(struct es1_ap_dev *es1)
 490 {
 491         if (IS_ERR_OR_NULL(apb1_log_task))
 492                 return;
 493
 494         debugfs_remove(apb1_log_dentry);
 495         apb1_log_dentry = NULL;
 496
 497         kthread_stop(apb1_log_task);
 498         apb1_log_task = NULL;
 499 }
 500
 501 static ssize_t apb1_log_enable_read(struct file *f, char __user *buf,
 502                                 size_t count, loff_t *ppos)
 503 {
 504         char tmp_buf[3];
 505         int enable = !IS_ERR_OR_NULL(apb1_log_task);
 506
 507         sprintf(tmp_buf, "%d\n", enable);
 508         return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
 509 }
 510
 511 static ssize_t apb1_log_enable_write(struct file *f, const char __user *buf,
 512                                 size_t count, loff_t *ppos)
 513 {
 514         int enable;
 515         ssize_t retval;
 516         struct es1_ap_dev *es1 = (struct es1_ap_dev *)f->f_inode->i_private;
 517
 518         retval = kstrtoint_from_user(buf, count, 10, &enable);
 519         if (retval)
 520                 return retval;
 521
 522         if (enable)
 523                 usb_log_enable(es1);
 524         else
 525                 usb_log_disable(es1);
 526
 527         return count;
 528 }
 529
 530 static const struct file_operations apb1_log_enable_fops = {
 531         .read   = apb1_log_enable_read,
 532         .write  = apb1_log_enable_write,
 533 };
 534
 535 /*
 536  * The ES1 USB Bridge device contains 4 endpoints
 537  * 1 Control - usual USB stuff + AP -> SVC messages
 538  * 1 Interrupt IN - SVC -> AP messages
 539  * 1 Bulk IN - CPort data in
 540  * 1 Bulk OUT - CPort data out
 541  */
 542 static int ap_probe(struct usb_interface *interface,
 543                     const struct usb_device_id *id)
 544 {
 545         struct es1_ap_dev *es1;
 546         struct greybus_host_device *hd;
 547         struct usb_device *udev;
 548         struct usb_host_interface *iface_desc;
 549         struct usb_endpoint_descriptor *endpoint;
 550         bool bulk_in_found = false;
 551         bool bulk_out_found = false;
 552         int retval = -ENOMEM;
 553         int i;
 554
 555         /* We need to fit a CPort ID in one byte of a message header */
 556         BUILD_BUG_ON(CPORT_ID_MAX > U8_MAX);
 557
 558         udev = usb_get_dev(interface_to_usbdev(interface));
 559
 560         hd = greybus_create_hd(&es1_driver, &udev->dev, ES1_GBUF_MSG_SIZE_MAX);
 561         if (IS_ERR(hd)) {
 562                 usb_put_dev(udev);
 563                 return PTR_ERR(hd);
 564         }
 565
 566         /* Initialize AP's greybus interface */
 567         if (!gb_ap_svc_connection_create(hd)) {
 568                 retval = -EINVAL;
 569                 goto error;
 570         }
 571
 572         es1 = hd_to_es1(hd);
 573         es1->hd = hd;
 574         es1->usb_intf = interface;
 575         es1->usb_dev = udev;
 576         spin_lock_init(&es1->cport_out_urb_lock);
 577         usb_set_intfdata(interface, es1);
 578
 579         /* Control endpoint is the pipe to talk to this AP, so save it off */
 580         endpoint = &udev->ep0.desc;
 581         es1->control_endpoint = endpoint->bEndpointAddress;
 582
 583         /* find all 3 of our endpoints */
 584         iface_desc = interface->cur_altsetting;
 585         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 586                 endpoint = &iface_desc->endpoint[i].desc;
 587
 588                 if (usb_endpoint_is_bulk_in(endpoint)) {
 589                         es1->cport_in_endpoint = endpoint->bEndpointAddress;
 590                         bulk_in_found = true;
 591                 } else if (usb_endpoint_is_bulk_out(endpoint)) {
 592                         es1->cport_out_endpoint = endpoint->bEndpointAddress;
 593                         bulk_out_found = true;
 594                 } else {
 595                         dev_err(&udev->dev,
 596                                 "Unknown endpoint type found, address %x\n",
 597                                 endpoint->bEndpointAddress);
 598                 }
 599         }
 600         if ((bulk_in_found == false) ||
 601             (bulk_out_found == false)) {
 602                 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
 603                 goto error;
 604         }
 605
 606         /* Allocate buffers for our cport in messages and start them up */
 607         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 608                 struct urb *urb;
 609                 u8 *buffer;
 610
 611                 urb = usb_alloc_urb(0, GFP_KERNEL);
 612                 if (!urb)
 613                         goto error;
 614                 buffer = kmalloc(ES1_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
 615                 if (!buffer)
 616                         goto error;
 617
 618                 usb_fill_bulk_urb(urb, udev,
 619                                   usb_rcvbulkpipe(udev, es1->cport_in_endpoint),
 620                                   buffer, ES1_GBUF_MSG_SIZE_MAX,
 621                                   cport_in_callback, hd);
 622                 es1->cport_in_urb[i] = urb;
 623                 es1->cport_in_buffer[i] = buffer;
 624                 retval = usb_submit_urb(urb, GFP_KERNEL);
 625                 if (retval)
 626                         goto error;
 627         }
 628
 629         /* Allocate urbs for our CPort OUT messages */
 630         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 631                 struct urb *urb;
 632
 633                 urb = usb_alloc_urb(0, GFP_KERNEL);
 634                 if (!urb)
 635                         goto error;
 636
 637                 es1->cport_out_urb[i] = urb;
 638                 es1->cport_out_urb_busy[i] = false;     /* just to be anal */
 639         }
 640
 641         apb1_log_enable_dentry = debugfs_create_file("apb1_log_enable",
 642                                                         (S_IWUSR | S_IRUGO),
 643                                                         gb_debugfs_get(), es1,
 644                                                         &apb1_log_enable_fops);
 645         return 0;
 646 error:
 647         ap_disconnect(interface);
 648
 649         return retval;
 650 }
 651
 652 static struct usb_driver es1_ap_driver = {
 653         .name =         "es1_ap_driver",
 654         .probe =        ap_probe,
 655         .disconnect =   ap_disconnect,
 656         .id_table =     id_table,
 657 };
 658
 659 module_usb_driver(es1_ap_driver);
 660
 661 MODULE_LICENSE("GPL v2");
 662 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");