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 #include "connection.h"
  19 #include "greybus_trace.h"
  20
  21 /* Memory sizes for the buffers sent to/from the ES1 controller */
  22 #define ES1_GBUF_MSG_SIZE_MAX   2048
  23
  24 static const struct usb_device_id id_table[] = {
  25         /* Made up numbers for the SVC USB Bridge in ES1 */
  26         { USB_DEVICE(0xffff, 0x0001) },
  27         { },
  28 };
  29 MODULE_DEVICE_TABLE(usb, id_table);
  30
  31 #define APB1_LOG_SIZE           SZ_16K
  32 static struct dentry *apb1_log_dentry;
  33 static struct dentry *apb1_log_enable_dentry;
  34 static struct task_struct *apb1_log_task;
  35 static DEFINE_KFIFO(apb1_log_fifo, char, APB1_LOG_SIZE);
  36
  37 /* Number of CPorts supported by es1 */
  38 #define CPORT_COUNT             256
  39
  40 /*
  41  * Number of CPort IN urbs in flight at any point in time.
  42  * Adjust if we are having stalls in the USB buffer due to not enough urbs in
  43  * flight.
  44  */
  45 #define NUM_CPORT_IN_URB        4
  46
  47 /* Number of CPort OUT urbs in flight at any point in time.
  48  * Adjust if we get messages saying we are out of urbs in the system log.
  49  */
  50 #define NUM_CPORT_OUT_URB       8
  51
  52 /* vendor request APB1 log */
  53 #define REQUEST_LOG             0x02
  54
  55 /* vendor request to time the latency of messages on a given cport */
  56 #define REQUEST_LATENCY_TAG_EN  0x06
  57 #define REQUEST_LATENCY_TAG_DIS 0x07
  58
  59 /**
  60  * es1_ap_dev - ES1 USB Bridge to AP structure
  61  * @usb_dev: pointer to the USB device we are.
  62  * @usb_intf: pointer to the USB interface we are bound to.
  63  * @hd: pointer to our greybus_host_device structure
  64  * @cport_in_endpoint: bulk in endpoint for CPort data
  65  * @cport-out_endpoint: bulk out endpoint for CPort data
  66  * @cport_in_urb: array of urbs for the CPort in messages
  67  * @cport_in_buffer: array of buffers for the @cport_in_urb urbs
  68  * @cport_out_urb: array of urbs for the CPort out messages
  69  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
  70  *                      not.
  71  * @cport_out_urb_cancelled: array of flags indicating whether the
  72  *                      corresponding @cport_out_urb is being cancelled
  73  * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
  74  */
  75 struct es1_ap_dev {
  76         struct usb_device *usb_dev;
  77         struct usb_interface *usb_intf;
  78         struct greybus_host_device *hd;
  79
  80         __u8 cport_in_endpoint;
  81         __u8 cport_out_endpoint;
  82
  83         struct urb *cport_in_urb[NUM_CPORT_IN_URB];
  84         u8 *cport_in_buffer[NUM_CPORT_IN_URB];
  85         struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
  86         bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
  87         bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
  88         spinlock_t cport_out_urb_lock;
  89 };
  90
  91 static inline struct es1_ap_dev *hd_to_es1(struct greybus_host_device *hd)
  92 {
  93         return (struct es1_ap_dev *)&hd->hd_priv;
  94 }
  95
  96 static void cport_out_callback(struct urb *urb);
  97 static void usb_log_enable(struct es1_ap_dev *es1);
  98 static void usb_log_disable(struct es1_ap_dev *es1);
  99
 100 #define ES1_TIMEOUT     500     /* 500 ms for the SVC to do something */
 101
 102 static struct urb *next_free_urb(struct es1_ap_dev *es1, gfp_t gfp_mask)
 103 {
 104         struct urb *urb = NULL;
 105         unsigned long flags;
 106         int i;
 107
 108         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 109
 110         /* Look in our pool of allocated urbs first, as that's the "fastest" */
 111         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 112                 if (es1->cport_out_urb_busy[i] == false &&
 113                                 es1->cport_out_urb_cancelled[i] == false) {
 114                         es1->cport_out_urb_busy[i] = true;
 115                         urb = es1->cport_out_urb[i];
 116                         break;
 117                 }
 118         }
 119         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 120         if (urb)
 121                 return urb;
 122
 123         /*
 124          * Crap, pool is empty, complain to the syslog and go allocate one
 125          * dynamically as we have to succeed.
 126          */
 127         dev_err(&es1->usb_dev->dev,
 128                 "No free CPort OUT urbs, having to dynamically allocate one!\n");
 129         return usb_alloc_urb(0, gfp_mask);
 130 }
 131
 132 static void free_urb(struct es1_ap_dev *es1, struct urb *urb)
 133 {
 134         unsigned long flags;
 135         int i;
 136         /*
 137          * See if this was an urb in our pool, if so mark it "free", otherwise
 138          * we need to free it ourselves.
 139          */
 140         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 141         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 142                 if (urb == es1->cport_out_urb[i]) {
 143                         es1->cport_out_urb_busy[i] = false;
 144                         urb = NULL;
 145                         break;
 146                 }
 147         }
 148         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 149
 150         /* If urb is not NULL, then we need to free this urb */
 151         usb_free_urb(urb);
 152 }
 153
 154 /*
 155  * We (ab)use the operation-message header pad bytes to transfer the
 156  * cport id in order to minimise overhead.
 157  */
 158 static void
 159 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
 160 {
 161         header->pad[0] = cport_id;
 162 }
 163
 164 /* Clear the pad bytes used for the CPort id */
 165 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
 166 {
 167         header->pad[0] = 0;
 168 }
 169
 170 /* Extract the CPort id packed into the header, and clear it */
 171 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
 172 {
 173         u16 cport_id = header->pad[0];
 174
 175         gb_message_cport_clear(header);
 176
 177         return cport_id;
 178 }
 179
 180 /*
 181  * Returns zero if the message was successfully queued, or a negative errno
 182  * otherwise.
 183  */
 184 static int message_send(struct greybus_host_device *hd, u16 cport_id,
 185                         struct gb_message *message, gfp_t gfp_mask)
 186 {
 187         struct es1_ap_dev *es1 = hd_to_es1(hd);
 188         struct usb_device *udev = es1->usb_dev;
 189         size_t buffer_size;
 190         int retval;
 191         struct urb *urb;
 192         unsigned long flags;
 193
 194         /*
 195          * The data actually transferred will include an indication
 196          * of where the data should be sent.  Do one last check of
 197          * the target CPort id before filling it in.
 198          */
 199         if (!cport_id_valid(hd, cport_id)) {
 200                 dev_err(&udev->dev, "invalid destination cport 0x%02x\n",
 201                                 cport_id);
 202                 return -EINVAL;
 203         }
 204
 205         /* Find a free urb */
 206         urb = next_free_urb(es1, gfp_mask);
 207         if (!urb)
 208                 return -ENOMEM;
 209
 210         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 211         message->hcpriv = urb;
 212         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 213
 214         /* Pack the cport id into the message header */
 215         gb_message_cport_pack(message->header, cport_id);
 216
 217         buffer_size = sizeof(*message->header) + message->payload_size;
 218
 219         usb_fill_bulk_urb(urb, udev,
 220                           usb_sndbulkpipe(udev, es1->cport_out_endpoint),
 221                           message->buffer, buffer_size,
 222                           cport_out_callback, message);
 223         urb->transfer_flags |= URB_ZERO_PACKET;
 224         trace_gb_host_device_send(hd, cport_id, buffer_size);
 225         retval = usb_submit_urb(urb, gfp_mask);
 226         if (retval) {
 227                 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
 228
 229                 spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 230                 message->hcpriv = NULL;
 231                 spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 232
 233                 free_urb(es1, urb);
 234                 gb_message_cport_clear(message->header);
 235
 236                 return retval;
 237         }
 238
 239         return 0;
 240 }
 241
 242 /*
 243  * Can not be called in atomic context.
 244  */
 245 static void message_cancel(struct gb_message *message)
 246 {
 247         struct greybus_host_device *hd = message->operation->connection->hd;
 248         struct es1_ap_dev *es1 = hd_to_es1(hd);
 249         struct urb *urb;
 250         int i;
 251
 252         might_sleep();
 253
 254         spin_lock_irq(&es1->cport_out_urb_lock);
 255         urb = message->hcpriv;
 256
 257         /* Prevent dynamically allocated urb from being deallocated. */
 258         usb_get_urb(urb);
 259
 260         /* Prevent pre-allocated urb from being reused. */
 261         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 262                 if (urb == es1->cport_out_urb[i]) {
 263                         es1->cport_out_urb_cancelled[i] = true;
 264                         break;
 265                 }
 266         }
 267         spin_unlock_irq(&es1->cport_out_urb_lock);
 268
 269         usb_kill_urb(urb);
 270
 271         if (i < NUM_CPORT_OUT_URB) {
 272                 spin_lock_irq(&es1->cport_out_urb_lock);
 273                 es1->cport_out_urb_cancelled[i] = false;
 274                 spin_unlock_irq(&es1->cport_out_urb_lock);
 275         }
 276
 277         usb_free_urb(urb);
 278 }
 279
 280 static int latency_tag_enable(struct greybus_host_device *hd, u16 cport_id)
 281 {
 282         int retval;
 283         struct es1_ap_dev *es1 = hd_to_es1(hd);
 284         struct usb_device *udev = es1->usb_dev;
 285
 286         if (!cport_id_valid(hd, cport_id)) {
 287                 dev_err(&udev->dev, "invalid destination cport 0x%02x\n",
 288                         cport_id);
 289                 return -EINVAL;
 290         }
 291
 292         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 293                                  REQUEST_LATENCY_TAG_EN,
 294                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 295                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 296                                  0, ES1_TIMEOUT);
 297
 298         if (retval < 0)
 299                 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
 300                         cport_id);
 301         return retval;
 302 }
 303
 304 static int latency_tag_disable(struct greybus_host_device *hd, u16 cport_id)
 305 {
 306         int retval;
 307         struct es1_ap_dev *es1 = hd_to_es1(hd);
 308         struct usb_device *udev = es1->usb_dev;
 309
 310         if (!cport_id_valid(hd, cport_id)) {
 311                 dev_err(&udev->dev, "invalid destination cport 0x%02x\n",
 312                         cport_id);
 313                 return -EINVAL;
 314         }
 315
 316         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 317                                  REQUEST_LATENCY_TAG_DIS,
 318                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 319                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 320                                  0, ES1_TIMEOUT);
 321
 322         if (retval < 0)
 323                 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
 324                         cport_id);
 325         return retval;
 326 }
 327
 328 static struct greybus_host_driver es1_driver = {
 329         .hd_priv_size           = sizeof(struct es1_ap_dev),
 330         .message_send           = message_send,
 331         .message_cancel         = message_cancel,
 332         .latency_tag_enable     = latency_tag_enable,
 333         .latency_tag_disable    = latency_tag_disable,
 334 };
 335
 336 /* Common function to report consistent warnings based on URB status */
 337 static int check_urb_status(struct urb *urb)
 338 {
 339         struct device *dev = &urb->dev->dev;
 340         int status = urb->status;
 341
 342         switch (status) {
 343         case 0:
 344                 return 0;
 345
 346         case -EOVERFLOW:
 347                 dev_err(dev, "%s: overflow actual length is %d\n",
 348                         __func__, urb->actual_length);
 349         case -ECONNRESET:
 350         case -ENOENT:
 351         case -ESHUTDOWN:
 352         case -EILSEQ:
 353         case -EPROTO:
 354                 /* device is gone, stop sending */
 355                 return status;
 356         }
 357         dev_err(dev, "%s: unknown status %d\n", __func__, status);
 358
 359         return -EAGAIN;
 360 }
 361
 362 static void ap_disconnect(struct usb_interface *interface)
 363 {
 364         struct es1_ap_dev *es1;
 365         struct usb_device *udev;
 366         int i;
 367
 368         es1 = usb_get_intfdata(interface);
 369         if (!es1)
 370                 return;
 371
 372         usb_log_disable(es1);
 373
 374         /* Tear down everything! */
 375         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 376                 struct urb *urb = es1->cport_out_urb[i];
 377
 378                 if (!urb)
 379                         break;
 380                 usb_kill_urb(urb);
 381                 usb_free_urb(urb);
 382                 es1->cport_out_urb[i] = NULL;
 383                 es1->cport_out_urb_busy[i] = false;     /* just to be anal */
 384         }
 385
 386         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 387                 struct urb *urb = es1->cport_in_urb[i];
 388
 389                 if (!urb)
 390                         break;
 391                 usb_kill_urb(urb);
 392                 usb_free_urb(urb);
 393                 kfree(es1->cport_in_buffer[i]);
 394                 es1->cport_in_buffer[i] = NULL;
 395         }
 396
 397         usb_set_intfdata(interface, NULL);
 398         udev = es1->usb_dev;
 399         greybus_remove_hd(es1->hd);
 400
 401         usb_put_dev(udev);
 402 }
 403
 404 static void cport_in_callback(struct urb *urb)
 405 {
 406         struct greybus_host_device *hd = urb->context;
 407         struct device *dev = &urb->dev->dev;
 408         struct gb_operation_msg_hdr *header;
 409         int status = check_urb_status(urb);
 410         int retval;
 411         u16 cport_id;
 412
 413         if (status) {
 414                 if ((status == -EAGAIN) || (status == -EPROTO))
 415                         goto exit;
 416                 dev_err(dev, "urb cport in error %d (dropped)\n", status);
 417                 return;
 418         }
 419
 420         if (urb->actual_length < sizeof(*header)) {
 421                 dev_err(dev, "short message received\n");
 422                 goto exit;
 423         }
 424
 425         /* Extract the CPort id, which is packed in the message header */
 426         header = urb->transfer_buffer;
 427         cport_id = gb_message_cport_unpack(header);
 428
 429         if (cport_id_valid(hd, cport_id)) {
 430                 trace_gb_host_device_recv(hd, cport_id, urb->actual_length);
 431                 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
 432                                                         urb->actual_length);
 433         } else {
 434                 dev_err(dev, "invalid cport id 0x%02x received\n", cport_id);
 435         }
 436 exit:
 437         /* put our urb back in the request pool */
 438         retval = usb_submit_urb(urb, GFP_ATOMIC);
 439         if (retval)
 440                 dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
 441 }
 442
 443 static void cport_out_callback(struct urb *urb)
 444 {
 445         struct gb_message *message = urb->context;
 446         struct greybus_host_device *hd = message->operation->connection->hd;
 447         struct es1_ap_dev *es1 = hd_to_es1(hd);
 448         int status = check_urb_status(urb);
 449         unsigned long flags;
 450
 451         gb_message_cport_clear(message->header);
 452
 453         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 454         message->hcpriv = NULL;
 455         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 456
 457         /*
 458          * Tell the submitter that the message send (attempt) is
 459          * complete, and report the status.
 460          */
 461         greybus_message_sent(hd, message, status);
 462
 463         free_urb(es1, urb);
 464 }
 465
 466 #define APB1_LOG_MSG_SIZE       64
 467 static void apb1_log_get(struct es1_ap_dev *es1, char *buf)
 468 {
 469         int retval;
 470
 471         /* SVC messages go down our control pipe */
 472         do {
 473                 retval = usb_control_msg(es1->usb_dev,
 474                                         usb_rcvctrlpipe(es1->usb_dev, 0),
 475                                         REQUEST_LOG,
 476                                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 477                                         0x00, 0x00,
 478                                         buf,
 479                                         APB1_LOG_MSG_SIZE,
 480                                         ES1_TIMEOUT);
 481                 if (retval > 0)
 482                         kfifo_in(&apb1_log_fifo, buf, retval);
 483         } while (retval > 0);
 484 }
 485
 486 static int apb1_log_poll(void *data)
 487 {
 488         struct es1_ap_dev *es1 = data;
 489         char *buf;
 490
 491         buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
 492         if (!buf)
 493                 return -ENOMEM;
 494
 495         while (!kthread_should_stop()) {
 496                 msleep(1000);
 497                 apb1_log_get(es1, buf);
 498         }
 499
 500         kfree(buf);
 501
 502         return 0;
 503 }
 504
 505 static ssize_t apb1_log_read(struct file *f, char __user *buf,
 506                                 size_t count, loff_t *ppos)
 507 {
 508         ssize_t ret;
 509         size_t copied;
 510         char *tmp_buf;
 511
 512         if (count > APB1_LOG_SIZE)
 513                 count = APB1_LOG_SIZE;
 514
 515         tmp_buf = kmalloc(count, GFP_KERNEL);
 516         if (!tmp_buf)
 517                 return -ENOMEM;
 518
 519         copied = kfifo_out(&apb1_log_fifo, tmp_buf, count);
 520         ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
 521
 522         kfree(tmp_buf);
 523
 524         return ret;
 525 }
 526
 527 static const struct file_operations apb1_log_fops = {
 528         .read   = apb1_log_read,
 529 };
 530
 531 static void usb_log_enable(struct es1_ap_dev *es1)
 532 {
 533         if (!IS_ERR_OR_NULL(apb1_log_task))
 534                 return;
 535
 536         /* get log from APB1 */
 537         apb1_log_task = kthread_run(apb1_log_poll, es1, "apb1_log");
 538         if (IS_ERR(apb1_log_task))
 539                 return;
 540         apb1_log_dentry = debugfs_create_file("apb1_log", S_IRUGO,
 541                                                 gb_debugfs_get(), NULL,
 542                                                 &apb1_log_fops);
 543 }
 544
 545 static void usb_log_disable(struct es1_ap_dev *es1)
 546 {
 547         if (IS_ERR_OR_NULL(apb1_log_task))
 548                 return;
 549
 550         debugfs_remove(apb1_log_dentry);
 551         apb1_log_dentry = NULL;
 552
 553         kthread_stop(apb1_log_task);
 554         apb1_log_task = NULL;
 555 }
 556
 557 static ssize_t apb1_log_enable_read(struct file *f, char __user *buf,
 558                                 size_t count, loff_t *ppos)
 559 {
 560         char tmp_buf[3];
 561         int enable = !IS_ERR_OR_NULL(apb1_log_task);
 562
 563         sprintf(tmp_buf, "%d\n", enable);
 564         return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
 565 }
 566
 567 static ssize_t apb1_log_enable_write(struct file *f, const char __user *buf,
 568                                 size_t count, loff_t *ppos)
 569 {
 570         int enable;
 571         ssize_t retval;
 572         struct es1_ap_dev *es1 = (struct es1_ap_dev *)f->f_inode->i_private;
 573
 574         retval = kstrtoint_from_user(buf, count, 10, &enable);
 575         if (retval)
 576                 return retval;
 577
 578         if (enable)
 579                 usb_log_enable(es1);
 580         else
 581                 usb_log_disable(es1);
 582
 583         return count;
 584 }
 585
 586 static const struct file_operations apb1_log_enable_fops = {
 587         .read   = apb1_log_enable_read,
 588         .write  = apb1_log_enable_write,
 589 };
 590
 591 /*
 592  * The ES1 USB Bridge device contains 4 endpoints
 593  * 1 Control - usual USB stuff + AP -> SVC messages
 594  * 1 Interrupt IN - SVC -> AP messages
 595  * 1 Bulk IN - CPort data in
 596  * 1 Bulk OUT - CPort data out
 597  */
 598 static int ap_probe(struct usb_interface *interface,
 599                     const struct usb_device_id *id)
 600 {
 601         struct es1_ap_dev *es1;
 602         struct greybus_host_device *hd;
 603         struct usb_device *udev;
 604         struct usb_host_interface *iface_desc;
 605         struct usb_endpoint_descriptor *endpoint;
 606         bool bulk_in_found = false;
 607         bool bulk_out_found = false;
 608         int retval = -ENOMEM;
 609         int i;
 610
 611         /* We need to fit a CPort ID in one byte of a message header */
 612         BUILD_BUG_ON(CPORT_COUNT > U8_MAX + 1);
 613
 614         udev = usb_get_dev(interface_to_usbdev(interface));
 615
 616         hd = greybus_create_hd(&es1_driver, &udev->dev, ES1_GBUF_MSG_SIZE_MAX,
 617                                CPORT_COUNT);
 618         if (IS_ERR(hd)) {
 619                 usb_put_dev(udev);
 620                 return PTR_ERR(hd);
 621         }
 622
 623         es1 = hd_to_es1(hd);
 624         es1->hd = hd;
 625         es1->usb_intf = interface;
 626         es1->usb_dev = udev;
 627         spin_lock_init(&es1->cport_out_urb_lock);
 628         usb_set_intfdata(interface, es1);
 629
 630         /* find all 3 of our endpoints */
 631         iface_desc = interface->cur_altsetting;
 632         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 633                 endpoint = &iface_desc->endpoint[i].desc;
 634
 635                 if (usb_endpoint_is_bulk_in(endpoint)) {
 636                         es1->cport_in_endpoint = endpoint->bEndpointAddress;
 637                         bulk_in_found = true;
 638                 } else if (usb_endpoint_is_bulk_out(endpoint)) {
 639                         es1->cport_out_endpoint = endpoint->bEndpointAddress;
 640                         bulk_out_found = true;
 641                 } else {
 642                         dev_err(&udev->dev,
 643                                 "Unknown endpoint type found, address %x\n",
 644                                 endpoint->bEndpointAddress);
 645                 }
 646         }
 647         if ((bulk_in_found == false) ||
 648             (bulk_out_found == false)) {
 649                 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
 650                 goto error;
 651         }
 652
 653         /* Allocate buffers for our cport in messages and start them up */
 654         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 655                 struct urb *urb;
 656                 u8 *buffer;
 657
 658                 urb = usb_alloc_urb(0, GFP_KERNEL);
 659                 if (!urb)
 660                         goto error;
 661                 buffer = kmalloc(ES1_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
 662                 if (!buffer)
 663                         goto error;
 664
 665                 usb_fill_bulk_urb(urb, udev,
 666                                   usb_rcvbulkpipe(udev, es1->cport_in_endpoint),
 667                                   buffer, ES1_GBUF_MSG_SIZE_MAX,
 668                                   cport_in_callback, hd);
 669                 es1->cport_in_urb[i] = urb;
 670                 es1->cport_in_buffer[i] = buffer;
 671                 retval = usb_submit_urb(urb, GFP_KERNEL);
 672                 if (retval)
 673                         goto error;
 674         }
 675
 676         /* Allocate urbs for our CPort OUT messages */
 677         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 678                 struct urb *urb;
 679
 680                 urb = usb_alloc_urb(0, GFP_KERNEL);
 681                 if (!urb)
 682                         goto error;
 683
 684                 es1->cport_out_urb[i] = urb;
 685                 es1->cport_out_urb_busy[i] = false;     /* just to be anal */
 686         }
 687
 688         apb1_log_enable_dentry = debugfs_create_file("apb1_log_enable",
 689                                                         (S_IWUSR | S_IRUGO),
 690                                                         gb_debugfs_get(), es1,
 691                                                         &apb1_log_enable_fops);
 692         return 0;
 693 error:
 694         ap_disconnect(interface);
 695
 696         return retval;
 697 }
 698
 699 static struct usb_driver es1_ap_driver = {
 700         .name =         "es1_ap_driver",
 701         .probe =        ap_probe,
 702         .disconnect =   ap_disconnect,
 703         .id_table =     id_table,
 704 };
 705
 706 module_usb_driver(es1_ap_driver);
 707
 708 MODULE_LICENSE("GPL v2");
 709 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");