drivers/staging/greybus/es2.c

   1 /*
   2  * Greybus "AP" USB driver for "ES2" 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 "svc_msg.h"
  18 #include "kernel_ver.h"
  19
  20 /* Memory sizes for the buffers sent to/from the ES1 controller */
  21 #define ES1_GBUF_MSG_SIZE_MAX   2048
  22
  23 static const struct usb_device_id id_table[] = {
  24         /* Made up numbers for the SVC USB Bridge in ES2 */
  25         { USB_DEVICE(0xffff, 0x0002) },
  26         { },
  27 };
  28 MODULE_DEVICE_TABLE(usb, id_table);
  29
  30 #define APB1_LOG_SIZE           SZ_16K
  31 static struct dentry *apb1_log_dentry;
  32 static struct dentry *apb1_log_enable_dentry;
  33 static struct task_struct *apb1_log_task;
  34 static DEFINE_KFIFO(apb1_log_fifo, char, APB1_LOG_SIZE);
  35
  36 /* Number of cport present on USB bridge */
  37 #define CPORT_MAX               44
  38
  39 /* Number of bulk in and bulk out couple */
  40 #define NUM_BULKS               7
  41
  42 /*
  43  * Number of CPort IN urbs in flight at any point in time.
  44  * Adjust if we are having stalls in the USB buffer due to not enough urbs in
  45  * flight.
  46  */
  47 #define NUM_CPORT_IN_URB        4
  48
  49 /* Number of CPort OUT urbs in flight at any point in time.
  50  * Adjust if we get messages saying we are out of urbs in the system log.
  51  */
  52 #define NUM_CPORT_OUT_URB       (8 * NUM_BULKS)
  53
  54 /* vendor request AP message */
  55 #define REQUEST_SVC             0x01
  56
  57 /* vendor request APB1 log */
  58 #define REQUEST_LOG             0x02
  59
  60 /* vendor request to map a cport to bulk in and bulk out endpoints */
  61 #define REQUEST_EP_MAPPING      0x03
  62
  63 /*
  64  * @endpoint: bulk in endpoint for CPort data
  65  * @urb: array of urbs for the CPort in messages
  66  * @buffer: array of buffers for the @cport_in_urb urbs
  67  */
  68 struct es1_cport_in {
  69         __u8 endpoint;
  70         struct urb *urb[NUM_CPORT_IN_URB];
  71         u8 *buffer[NUM_CPORT_IN_URB];
  72 };
  73
  74 /*
  75  * @endpoint: bulk out endpoint for CPort data
  76  */
  77 struct es1_cport_out {
  78         __u8 endpoint;
  79 };
  80
  81 /**
  82  * es1_ap_dev - ES1 USB Bridge to AP structure
  83  * @usb_dev: pointer to the USB device we are.
  84  * @usb_intf: pointer to the USB interface we are bound to.
  85  * @hd: pointer to our greybus_host_device structure
  86  * @control_endpoint: endpoint to send data to SVC
  87
  88  * @cport_in: endpoint, urbs and buffer for cport in messages
  89  * @cport_out: endpoint for for cport out messages
  90  * @cport_out_urb: array of urbs for the CPort out messages
  91  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
  92  *                      not.
  93  * @cport_out_urb_cancelled: array of flags indicating whether the
  94  *                      corresponding @cport_out_urb is being cancelled
  95  * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
  96  */
  97 struct es1_ap_dev {
  98         struct usb_device *usb_dev;
  99         struct usb_interface *usb_intf;
 100         struct greybus_host_device *hd;
 101
 102         __u8 control_endpoint;
 103
 104         struct es1_cport_in cport_in[NUM_BULKS];
 105         struct es1_cport_out cport_out[NUM_BULKS];
 106         struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
 107         bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
 108         bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
 109         spinlock_t cport_out_urb_lock;
 110
 111         int cport_to_ep[CPORT_MAX];
 112 };
 113
 114 struct cport_to_ep {
 115         __le16 cport_id;
 116         __u8 endpoint_in;
 117         __u8 endpoint_out;
 118 };
 119
 120 static inline struct es1_ap_dev *hd_to_es1(struct greybus_host_device *hd)
 121 {
 122         return (struct es1_ap_dev *)&hd->hd_priv;
 123 }
 124
 125 static void cport_out_callback(struct urb *urb);
 126 static void usb_log_enable(struct es1_ap_dev *es1);
 127 static void usb_log_disable(struct es1_ap_dev *es1);
 128
 129 static int cport_to_ep(struct es1_ap_dev *es1, u16 cport_id)
 130 {
 131         if (cport_id >= CPORT_MAX)
 132                 return 0;
 133         return es1->cport_to_ep[cport_id];
 134 }
 135
 136 #define ES1_TIMEOUT     500     /* 500 ms for the SVC to do something */
 137 static int submit_svc(struct svc_msg *svc_msg, struct greybus_host_device *hd)
 138 {
 139         struct es1_ap_dev *es1 = hd_to_es1(hd);
 140         int retval;
 141
 142         /* SVC messages go down our control pipe */
 143         retval = usb_control_msg(es1->usb_dev,
 144                                  usb_sndctrlpipe(es1->usb_dev,
 145                                                  es1->control_endpoint),
 146                                  REQUEST_SVC,
 147                                  USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 148                                  0x00, 0x00,
 149                                  (char *)svc_msg,
 150                                  sizeof(*svc_msg),
 151                                  ES1_TIMEOUT);
 152         if (retval != sizeof(*svc_msg))
 153                 return retval;
 154
 155         return 0;
 156 }
 157
 158 static int ep_in_use(struct es1_ap_dev *es1, int bulk_ep_set)
 159 {
 160         int i;
 161
 162         for (i = 0; i < CPORT_MAX; i++) {
 163                 if (es1->cport_to_ep[i] == bulk_ep_set)
 164                         return 1;
 165         }
 166         return 0;
 167 }
 168
 169 int map_cport_to_ep(struct es1_ap_dev *es1,
 170                                 u16 cport_id, int bulk_ep_set)
 171 {
 172         int retval;
 173         struct cport_to_ep *cport_to_ep;
 174
 175         if (bulk_ep_set == 0 || bulk_ep_set >= NUM_BULKS)
 176                 return -EINVAL;
 177         if (cport_id >= CPORT_MAX)
 178                 return -EINVAL;
 179         if (bulk_ep_set && ep_in_use(es1, bulk_ep_set))
 180                 return -EINVAL;
 181
 182         cport_to_ep = kmalloc(sizeof(*cport_to_ep), GFP_KERNEL);
 183         if (!cport_to_ep)
 184                 return -ENOMEM;
 185
 186         es1->cport_to_ep[cport_id] = bulk_ep_set;
 187         cport_to_ep->cport_id = cpu_to_le16(cport_id);
 188         cport_to_ep->endpoint_in = es1->cport_in[bulk_ep_set].endpoint;
 189         cport_to_ep->endpoint_out = es1->cport_out[bulk_ep_set].endpoint;
 190
 191         retval = usb_control_msg(es1->usb_dev,
 192                                  usb_sndctrlpipe(es1->usb_dev,
 193                                                  es1->control_endpoint),
 194                                  REQUEST_EP_MAPPING,
 195                                  USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 196                                  0x00, 0x00,
 197                                  (char *)cport_to_ep,
 198                                  sizeof(*cport_to_ep),
 199                                  ES1_TIMEOUT);
 200         if (retval == sizeof(*cport_to_ep))
 201                 retval = 0;
 202         kfree(cport_to_ep);
 203
 204         return retval;
 205 }
 206
 207 int unmap_cport(struct es1_ap_dev *es1, u16 cport_id)
 208 {
 209         return map_cport_to_ep(es1, cport_id, 0);
 210 }
 211
 212 static struct urb *next_free_urb(struct es1_ap_dev *es1, gfp_t gfp_mask)
 213 {
 214         struct urb *urb = NULL;
 215         unsigned long flags;
 216         int i;
 217
 218         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 219
 220         /* Look in our pool of allocated urbs first, as that's the "fastest" */
 221         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 222                 if (es1->cport_out_urb_busy[i] == false &&
 223                                 es1->cport_out_urb_cancelled[i] == false) {
 224                         es1->cport_out_urb_busy[i] = true;
 225                         urb = es1->cport_out_urb[i];
 226                         break;
 227                 }
 228         }
 229         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 230         if (urb)
 231                 return urb;
 232
 233         /*
 234          * Crap, pool is empty, complain to the syslog and go allocate one
 235          * dynamically as we have to succeed.
 236          */
 237         dev_err(&es1->usb_dev->dev,
 238                 "No free CPort OUT urbs, having to dynamically allocate one!\n");
 239         return usb_alloc_urb(0, gfp_mask);
 240 }
 241
 242 static void free_urb(struct es1_ap_dev *es1, struct urb *urb)
 243 {
 244         unsigned long flags;
 245         int i;
 246         /*
 247          * See if this was an urb in our pool, if so mark it "free", otherwise
 248          * we need to free it ourselves.
 249          */
 250         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 251         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 252                 if (urb == es1->cport_out_urb[i]) {
 253                         es1->cport_out_urb_busy[i] = false;
 254                         urb = NULL;
 255                         break;
 256                 }
 257         }
 258         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 259
 260         /* If urb is not NULL, then we need to free this urb */
 261         usb_free_urb(urb);
 262 }
 263
 264 /*
 265  * We (ab)use the operation-message header pad bytes to transfer the
 266  * cport id in order to minimise overhead.
 267  */
 268 static void
 269 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
 270 {
 271         header->pad[0] = cport_id;
 272 }
 273
 274 /* Clear the pad bytes used for the CPort id */
 275 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
 276 {
 277         header->pad[0] = 0;
 278 }
 279
 280 /* Extract the CPort id packed into the header, and clear it */
 281 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
 282 {
 283         u16 cport_id = header->pad[0];
 284
 285         gb_message_cport_clear(header);
 286
 287         return cport_id;
 288 }
 289
 290 /*
 291  * Returns zero if the message was successfully queued, or a negative errno
 292  * otherwise.
 293  */
 294 static int message_send(struct greybus_host_device *hd, u16 cport_id,
 295                         struct gb_message *message, gfp_t gfp_mask)
 296 {
 297         struct es1_ap_dev *es1 = hd_to_es1(hd);
 298         struct usb_device *udev = es1->usb_dev;
 299         size_t buffer_size;
 300         int retval;
 301         struct urb *urb;
 302         int bulk_ep_set;
 303         unsigned long flags;
 304
 305         /*
 306          * The data actually transferred will include an indication
 307          * of where the data should be sent.  Do one last check of
 308          * the target CPort id before filling it in.
 309          */
 310         if (!cport_id_valid(cport_id)) {
 311                 pr_err("invalid destination cport 0x%02x\n", cport_id);
 312                 return -EINVAL;
 313         }
 314
 315         /* Find a free urb */
 316         urb = next_free_urb(es1, gfp_mask);
 317         if (!urb)
 318                 return -ENOMEM;
 319
 320         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 321         message->hcpriv = urb;
 322         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 323
 324         /* Pack the cport id into the message header */
 325         gb_message_cport_pack(message->header, cport_id);
 326
 327         buffer_size = sizeof(*message->header) + message->payload_size;
 328
 329         bulk_ep_set = cport_to_ep(es1, cport_id);
 330         usb_fill_bulk_urb(urb, udev,
 331                           usb_sndbulkpipe(udev,
 332                                           es1->cport_out[bulk_ep_set].endpoint),
 333                           message->buffer, buffer_size,
 334                           cport_out_callback, message);
 335         retval = usb_submit_urb(urb, gfp_mask);
 336         if (retval) {
 337                 pr_err("error %d submitting URB\n", retval);
 338
 339                 spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 340                 message->hcpriv = NULL;
 341                 spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 342
 343                 free_urb(es1, urb);
 344                 gb_message_cport_clear(message->header);
 345
 346                 return retval;
 347         }
 348
 349         return 0;
 350 }
 351
 352 /*
 353  * Can not be called in atomic context.
 354  */
 355 static void message_cancel(struct gb_message *message)
 356 {
 357         struct greybus_host_device *hd = message->operation->connection->hd;
 358         struct es1_ap_dev *es1 = hd_to_es1(hd);
 359         struct urb *urb;
 360         int i;
 361
 362         might_sleep();
 363
 364         spin_lock_irq(&es1->cport_out_urb_lock);
 365         urb = message->hcpriv;
 366
 367         /* Prevent dynamically allocated urb from being deallocated. */
 368         usb_get_urb(urb);
 369
 370         /* Prevent pre-allocated urb from being reused. */
 371         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 372                 if (urb == es1->cport_out_urb[i]) {
 373                         es1->cport_out_urb_cancelled[i] = true;
 374                         break;
 375                 }
 376         }
 377         spin_unlock_irq(&es1->cport_out_urb_lock);
 378
 379         usb_kill_urb(urb);
 380
 381         if (i < NUM_CPORT_OUT_URB) {
 382                 spin_lock_irq(&es1->cport_out_urb_lock);
 383                 es1->cport_out_urb_cancelled[i] = false;
 384                 spin_unlock_irq(&es1->cport_out_urb_lock);
 385         }
 386
 387         usb_free_urb(urb);
 388 }
 389
 390 static struct greybus_host_driver es1_driver = {
 391         .hd_priv_size           = sizeof(struct es1_ap_dev),
 392         .message_send           = message_send,
 393         .message_cancel         = message_cancel,
 394         .submit_svc             = submit_svc,
 395 };
 396
 397 /* Common function to report consistent warnings based on URB status */
 398 static int check_urb_status(struct urb *urb)
 399 {
 400         struct device *dev = &urb->dev->dev;
 401         int status = urb->status;
 402
 403         switch (status) {
 404         case 0:
 405                 return 0;
 406
 407         case -EOVERFLOW:
 408                 dev_err(dev, "%s: overflow actual length is %d\n",
 409                         __func__, urb->actual_length);
 410         case -ECONNRESET:
 411         case -ENOENT:
 412         case -ESHUTDOWN:
 413         case -EILSEQ:
 414         case -EPROTO:
 415                 /* device is gone, stop sending */
 416                 return status;
 417         }
 418         dev_err(dev, "%s: unknown status %d\n", __func__, status);
 419
 420         return -EAGAIN;
 421 }
 422
 423 static void ap_disconnect(struct usb_interface *interface)
 424 {
 425         struct es1_ap_dev *es1;
 426         struct usb_device *udev;
 427         int bulk_in;
 428         int i;
 429
 430         es1 = usb_get_intfdata(interface);
 431         if (!es1)
 432                 return;
 433
 434         usb_log_disable(es1);
 435
 436         /* Tear down everything! */
 437         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 438                 struct urb *urb = es1->cport_out_urb[i];
 439
 440                 if (!urb)
 441                         break;
 442                 usb_kill_urb(urb);
 443                 usb_free_urb(urb);
 444                 es1->cport_out_urb[i] = NULL;
 445                 es1->cport_out_urb_busy[i] = false;     /* just to be anal */
 446         }
 447
 448         for (bulk_in = 0; bulk_in < NUM_BULKS; bulk_in++) {
 449                 struct es1_cport_in *cport_in = &es1->cport_in[bulk_in];
 450                 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 451                         struct urb *urb = cport_in->urb[i];
 452
 453                         if (!urb)
 454                                 break;
 455                         usb_kill_urb(urb);
 456                         usb_free_urb(urb);
 457                         kfree(cport_in->buffer[i]);
 458                         cport_in->buffer[i] = NULL;
 459                 }
 460         }
 461
 462         usb_set_intfdata(interface, NULL);
 463         udev = es1->usb_dev;
 464         greybus_remove_hd(es1->hd);
 465
 466         usb_put_dev(udev);
 467 }
 468
 469 static void cport_in_callback(struct urb *urb)
 470 {
 471         struct greybus_host_device *hd = urb->context;
 472         struct device *dev = &urb->dev->dev;
 473         struct gb_operation_msg_hdr *header;
 474         int status = check_urb_status(urb);
 475         int retval;
 476         u16 cport_id;
 477
 478         if (status) {
 479                 if ((status == -EAGAIN) || (status == -EPROTO))
 480                         goto exit;
 481                 dev_err(dev, "urb cport in error %d (dropped)\n", status);
 482                 return;
 483         }
 484
 485         if (urb->actual_length < sizeof(*header)) {
 486                 dev_err(dev, "%s: short message received\n", __func__);
 487                 goto exit;
 488         }
 489
 490         /* Extract the CPort id, which is packed in the message header */
 491         header = urb->transfer_buffer;
 492         cport_id = gb_message_cport_unpack(header);
 493
 494         if (cport_id_valid(cport_id))
 495                 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
 496                                                         urb->actual_length);
 497         else
 498                 dev_err(dev, "%s: invalid cport id 0x%02x received\n",
 499                                 __func__, cport_id);
 500 exit:
 501         /* put our urb back in the request pool */
 502         retval = usb_submit_urb(urb, GFP_ATOMIC);
 503         if (retval)
 504                 dev_err(dev, "%s: error %d in submitting urb.\n",
 505                         __func__, retval);
 506 }
 507
 508 static void cport_out_callback(struct urb *urb)
 509 {
 510         struct gb_message *message = urb->context;
 511         struct greybus_host_device *hd = message->operation->connection->hd;
 512         struct es1_ap_dev *es1 = hd_to_es1(hd);
 513         int status = check_urb_status(urb);
 514         unsigned long flags;
 515
 516         gb_message_cport_clear(message->header);
 517
 518         /*
 519          * Tell the submitter that the message send (attempt) is
 520          * complete, and report the status.
 521          */
 522         greybus_message_sent(hd, message, status);
 523
 524         spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
 525         message->hcpriv = NULL;
 526         spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
 527
 528         free_urb(es1, urb);
 529 }
 530
 531 #define APB1_LOG_MSG_SIZE       64
 532 static void apb1_log_get(struct es1_ap_dev *es1, char *buf)
 533 {
 534         int retval;
 535
 536         /* SVC messages go down our control pipe */
 537         do {
 538                 retval = usb_control_msg(es1->usb_dev,
 539                                         usb_rcvctrlpipe(es1->usb_dev,
 540                                                         es1->control_endpoint),
 541                                         REQUEST_LOG,
 542                                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 543                                         0x00, 0x00,
 544                                         buf,
 545                                         APB1_LOG_MSG_SIZE,
 546                                         ES1_TIMEOUT);
 547                 if (retval > 0)
 548                         kfifo_in(&apb1_log_fifo, buf, retval);
 549         } while (retval > 0);
 550 }
 551
 552 static int apb1_log_poll(void *data)
 553 {
 554         struct es1_ap_dev *es1 = data;
 555         char *buf;
 556
 557         buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
 558         if (!buf)
 559                 return -ENOMEM;
 560
 561         while (!kthread_should_stop()) {
 562                 msleep(1000);
 563                 apb1_log_get(es1, buf);
 564         }
 565
 566         kfree(buf);
 567
 568         return 0;
 569 }
 570
 571 static ssize_t apb1_log_read(struct file *f, char __user *buf,
 572                                 size_t count, loff_t *ppos)
 573 {
 574         ssize_t ret;
 575         size_t copied;
 576         char *tmp_buf;
 577
 578         if (count > APB1_LOG_SIZE)
 579                 count = APB1_LOG_SIZE;
 580
 581         tmp_buf = kmalloc(count, GFP_KERNEL);
 582         if (!tmp_buf)
 583                 return -ENOMEM;
 584
 585         copied = kfifo_out(&apb1_log_fifo, tmp_buf, count);
 586         ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
 587
 588         kfree(tmp_buf);
 589
 590         return ret;
 591 }
 592
 593 static const struct file_operations apb1_log_fops = {
 594         .read   = apb1_log_read,
 595 };
 596
 597 static void usb_log_enable(struct es1_ap_dev *es1)
 598 {
 599         if (!IS_ERR_OR_NULL(apb1_log_task))
 600                 return;
 601
 602         /* get log from APB1 */
 603         apb1_log_task = kthread_run(apb1_log_poll, es1, "apb1_log");
 604         if (IS_ERR(apb1_log_task))
 605                 return;
 606         apb1_log_dentry = debugfs_create_file("apb1_log", S_IRUGO,
 607                                                 gb_debugfs_get(), NULL,
 608                                                 &apb1_log_fops);
 609 }
 610
 611 static void usb_log_disable(struct es1_ap_dev *es1)
 612 {
 613         if (IS_ERR_OR_NULL(apb1_log_task))
 614                 return;
 615
 616         debugfs_remove(apb1_log_dentry);
 617         apb1_log_dentry = NULL;
 618
 619         kthread_stop(apb1_log_task);
 620         apb1_log_task = NULL;
 621 }
 622
 623 static ssize_t apb1_log_enable_read(struct file *f, char __user *buf,
 624                                 size_t count, loff_t *ppos)
 625 {
 626         char tmp_buf[3];
 627         int enable = !IS_ERR_OR_NULL(apb1_log_task);
 628
 629         sprintf(tmp_buf, "%d\n", enable);
 630         return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
 631 }
 632
 633 static ssize_t apb1_log_enable_write(struct file *f, const char __user *buf,
 634                                 size_t count, loff_t *ppos)
 635 {
 636         int enable;
 637         ssize_t retval;
 638         struct es1_ap_dev *es1 = (struct es1_ap_dev *)f->f_inode->i_private;
 639
 640         retval = kstrtoint_from_user(buf, count, 10, &enable);
 641         if (retval)
 642                 return retval;
 643
 644         if (enable)
 645                 usb_log_enable(es1);
 646         else
 647                 usb_log_disable(es1);
 648
 649         return count;
 650 }
 651
 652 static const struct file_operations apb1_log_enable_fops = {
 653         .read   = apb1_log_enable_read,
 654         .write  = apb1_log_enable_write,
 655 };
 656
 657 /*
 658  * The ES1 USB Bridge device contains 4 endpoints
 659  * 1 Control - usual USB stuff + AP -> SVC messages
 660  * 1 Interrupt IN - SVC -> AP messages
 661  * 1 Bulk IN - CPort data in
 662  * 1 Bulk OUT - CPort data out
 663  */
 664 static int ap_probe(struct usb_interface *interface,
 665                     const struct usb_device_id *id)
 666 {
 667         struct es1_ap_dev *es1;
 668         struct greybus_host_device *hd;
 669         struct usb_device *udev;
 670         struct usb_host_interface *iface_desc;
 671         struct usb_endpoint_descriptor *endpoint;
 672         int bulk_in = 0;
 673         int bulk_out = 0;
 674         int retval = -ENOMEM;
 675         int i;
 676
 677         /* We need to fit a CPort ID in one byte of a message header */
 678         BUILD_BUG_ON(CPORT_ID_MAX > U8_MAX);
 679
 680         udev = usb_get_dev(interface_to_usbdev(interface));
 681
 682         hd = greybus_create_hd(&es1_driver, &udev->dev, ES1_GBUF_MSG_SIZE_MAX);
 683         if (IS_ERR(hd)) {
 684                 usb_put_dev(udev);
 685                 return PTR_ERR(hd);
 686         }
 687
 688         es1 = hd_to_es1(hd);
 689         es1->hd = hd;
 690         es1->usb_intf = interface;
 691         es1->usb_dev = udev;
 692         spin_lock_init(&es1->cport_out_urb_lock);
 693         usb_set_intfdata(interface, es1);
 694
 695         /* Control endpoint is the pipe to talk to this AP, so save it off */
 696         endpoint = &udev->ep0.desc;
 697         es1->control_endpoint = endpoint->bEndpointAddress;
 698
 699         /* find all 3 of our endpoints */
 700         iface_desc = interface->cur_altsetting;
 701         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 702                 endpoint = &iface_desc->endpoint[i].desc;
 703
 704                 if (usb_endpoint_is_bulk_in(endpoint)) {
 705                         es1->cport_in[bulk_in++].endpoint =
 706                                 endpoint->bEndpointAddress;
 707                 } else if (usb_endpoint_is_bulk_out(endpoint)) {
 708                         es1->cport_out[bulk_out++].endpoint =
 709                                 endpoint->bEndpointAddress;
 710                 } else {
 711                         dev_err(&udev->dev,
 712                                 "Unknown endpoint type found, address %x\n",
 713                                 endpoint->bEndpointAddress);
 714                 }
 715         }
 716         if ((bulk_in == 0) ||
 717             (bulk_out == 0)) {
 718                 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
 719                 goto error;
 720         }
 721
 722         /* Allocate buffers for our cport in messages and start them up */
 723         for (bulk_in = 0; bulk_in < NUM_BULKS; bulk_in++) {
 724                 struct es1_cport_in *cport_in = &es1->cport_in[bulk_in];
 725                 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 726                         struct urb *urb;
 727                         u8 *buffer;
 728
 729                         urb = usb_alloc_urb(0, GFP_KERNEL);
 730                         if (!urb)
 731                                 goto error;
 732                         buffer = kmalloc(ES1_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
 733                         if (!buffer)
 734                                 goto error;
 735
 736                         usb_fill_bulk_urb(urb, udev,
 737                                           usb_rcvbulkpipe(udev,
 738                                                           cport_in->endpoint),
 739                                           buffer, ES1_GBUF_MSG_SIZE_MAX,
 740                                           cport_in_callback, hd);
 741                         cport_in->urb[i] = urb;
 742                         cport_in->buffer[i] = buffer;
 743                         retval = usb_submit_urb(urb, GFP_KERNEL);
 744                         if (retval)
 745                                 goto error;
 746                 }
 747         }
 748
 749         /* Allocate urbs for our CPort OUT messages */
 750         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 751                 struct urb *urb;
 752
 753                 urb = usb_alloc_urb(0, GFP_KERNEL);
 754                 if (!urb)
 755                         goto error;
 756
 757                 es1->cport_out_urb[i] = urb;
 758                 es1->cport_out_urb_busy[i] = false;     /* just to be anal */
 759         }
 760
 761         /* Initialize AP's greybus interface */
 762         if (!gb_ap_svc_connection_create(hd)) {
 763                 retval = -EINVAL;
 764                 goto error;
 765         }
 766
 767         apb1_log_enable_dentry = debugfs_create_file("apb1_log_enable",
 768                                                         (S_IWUSR | S_IRUGO),
 769                                                         gb_debugfs_get(), es1,
 770                                                         &apb1_log_enable_fops);
 771         return 0;
 772 error:
 773         ap_disconnect(interface);
 774
 775         return retval;
 776 }
 777
 778 static struct usb_driver es1_ap_driver = {
 779         .name =         "es2_ap_driver",
 780         .probe =        ap_probe,
 781         .disconnect =   ap_disconnect,
 782         .id_table =     id_table,
 783 };
 784
 785 module_usb_driver(es1_ap_driver);
 786
 787 MODULE_LICENSE("GPL v2");
 788 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");