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 "kernel_ver.h"
  18 #include "connection.h"
  19 #include "greybus_trace.h"
  20
  21
  22 /* Fixed CPort numbers */
  23 #define ES2_CPORT_CDSI0         16
  24 #define ES2_CPORT_CDSI1         17
  25
  26 /* Memory sizes for the buffers sent to/from the ES2 controller */
  27 #define ES2_GBUF_MSG_SIZE_MAX   2048
  28
  29 static const struct usb_device_id id_table[] = {
  30         { USB_DEVICE(0x18d1, 0x1eaf) },
  31         { },
  32 };
  33 MODULE_DEVICE_TABLE(usb, id_table);
  34
  35 #define APB1_LOG_SIZE           SZ_16K
  36
  37 /* Number of bulk in and bulk out couple */
  38 #define NUM_BULKS               7
  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 * NUM_BULKS)
  51
  52 /*
  53  * @endpoint: bulk in endpoint for CPort data
  54  * @urb: array of urbs for the CPort in messages
  55  * @buffer: array of buffers for the @cport_in_urb urbs
  56  */
  57 struct es2_cport_in {
  58         __u8 endpoint;
  59         struct urb *urb[NUM_CPORT_IN_URB];
  60         u8 *buffer[NUM_CPORT_IN_URB];
  61 };
  62
  63 /*
  64  * @endpoint: bulk out endpoint for CPort data
  65  */
  66 struct es2_cport_out {
  67         __u8 endpoint;
  68 };
  69
  70 /**
  71  * es2_ap_dev - ES2 USB Bridge to AP structure
  72  * @usb_dev: pointer to the USB device we are.
  73  * @usb_intf: pointer to the USB interface we are bound to.
  74  * @hd: pointer to our gb_host_device structure
  75
  76  * @cport_in: endpoint, urbs and buffer for cport in messages
  77  * @cport_out: endpoint for for cport out messages
  78  * @cport_out_urb: array of urbs for the CPort out messages
  79  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
  80  *                      not.
  81  * @cport_out_urb_cancelled: array of flags indicating whether the
  82  *                      corresponding @cport_out_urb is being cancelled
  83  * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
  84  *
  85  * @apb_log_task: task pointer for logging thread
  86  * @apb_log_dentry: file system entry for the log file interface
  87  * @apb_log_enable_dentry: file system entry for enabling logging
  88  * @apb_log_fifo: kernel FIFO to carry logged data
  89  */
  90 struct es2_ap_dev {
  91         struct usb_device *usb_dev;
  92         struct usb_interface *usb_intf;
  93         struct gb_host_device *hd;
  94
  95         struct es2_cport_in cport_in[NUM_BULKS];
  96         struct es2_cport_out cport_out[NUM_BULKS];
  97         struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
  98         bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
  99         bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
 100         spinlock_t cport_out_urb_lock;
 101
 102         bool cdsi1_in_use;
 103
 104         int *cport_to_ep;
 105
 106         struct task_struct *apb_log_task;
 107         struct dentry *apb_log_dentry;
 108         struct dentry *apb_log_enable_dentry;
 109         DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);
 110 };
 111
 112 /**
 113  * cport_to_ep - information about cport to endpoints mapping
 114  * @cport_id: the id of cport to map to endpoints
 115  * @endpoint_in: the endpoint number to use for in transfer
 116  * @endpoint_out: he endpoint number to use for out transfer
 117  */
 118 struct cport_to_ep {
 119         __le16 cport_id;
 120         __u8 endpoint_in;
 121         __u8 endpoint_out;
 122 };
 123
 124 /**
 125  * timesync_enable_request - Enable timesync in an APBridge
 126  * @count: number of TimeSync Pulses to expect
 127  * @frame_time: the initial FrameTime at the first TimeSync Pulse
 128  * @strobe_delay: the expected delay in microseconds between each TimeSync Pulse
 129  * @refclk: The AP mandated reference clock to run FrameTime at
 130  */
 131 struct timesync_enable_request {
 132         __u8    count;
 133         __le64  frame_time;
 134         __le32  strobe_delay;
 135         __le32  refclk;
 136 } __packed;
 137
 138 /**
 139  * timesync_authoritative_request - Transmit authoritative FrameTime to APBridge
 140  * @frame_time: An array of authoritative FrameTimes provided by the SVC
 141  *              and relayed to the APBridge by the AP
 142  */
 143 struct timesync_authoritative_request {
 144         __le64  frame_time[GB_TIMESYNC_MAX_STROBES];
 145 } __packed;
 146
 147 static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
 148 {
 149         return (struct es2_ap_dev *)&hd->hd_priv;
 150 }
 151
 152 static void cport_out_callback(struct urb *urb);
 153 static void usb_log_enable(struct es2_ap_dev *es2);
 154 static void usb_log_disable(struct es2_ap_dev *es2);
 155
 156 /* Get the endpoints pair mapped to the cport */
 157 static int cport_to_ep_pair(struct es2_ap_dev *es2, u16 cport_id)
 158 {
 159         if (cport_id >= es2->hd->num_cports)
 160                 return 0;
 161         return es2->cport_to_ep[cport_id];
 162 }
 163
 164 #define ES2_TIMEOUT     500     /* 500 ms for the SVC to do something */
 165
 166 /* Disable for now until we work all of this out to keep a warning-free build */
 167 #if 0
 168 /* Test if the endpoints pair is already mapped to a cport */
 169 static int ep_pair_in_use(struct es2_ap_dev *es2, int ep_pair)
 170 {
 171         int i;
 172
 173         for (i = 0; i < es2->hd->num_cports; i++) {
 174                 if (es2->cport_to_ep[i] == ep_pair)
 175                         return 1;
 176         }
 177         return 0;
 178 }
 179
 180 /* Configure the endpoint mapping and send the request to APBridge */
 181 static int map_cport_to_ep(struct es2_ap_dev *es2,
 182                                 u16 cport_id, int ep_pair)
 183 {
 184         int retval;
 185         struct cport_to_ep *cport_to_ep;
 186
 187         if (ep_pair < 0 || ep_pair >= NUM_BULKS)
 188                 return -EINVAL;
 189         if (cport_id >= es2->hd->num_cports)
 190                 return -EINVAL;
 191         if (ep_pair && ep_pair_in_use(es2, ep_pair))
 192                 return -EINVAL;
 193
 194         cport_to_ep = kmalloc(sizeof(*cport_to_ep), GFP_KERNEL);
 195         if (!cport_to_ep)
 196                 return -ENOMEM;
 197
 198         es2->cport_to_ep[cport_id] = ep_pair;
 199         cport_to_ep->cport_id = cpu_to_le16(cport_id);
 200         cport_to_ep->endpoint_in = es2->cport_in[ep_pair].endpoint;
 201         cport_to_ep->endpoint_out = es2->cport_out[ep_pair].endpoint;
 202
 203         retval = usb_control_msg(es2->usb_dev,
 204                                  usb_sndctrlpipe(es2->usb_dev, 0),
 205                                  GB_APB_REQUEST_EP_MAPPING,
 206                                  USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 207                                  0x00, 0x00,
 208                                  (char *)cport_to_ep,
 209                                  sizeof(*cport_to_ep),
 210                                  ES2_TIMEOUT);
 211         if (retval == sizeof(*cport_to_ep))
 212                 retval = 0;
 213         kfree(cport_to_ep);
 214
 215         return retval;
 216 }
 217
 218 /* Unmap a cport: use the muxed endpoints pair */
 219 static int unmap_cport(struct es2_ap_dev *es2, u16 cport_id)
 220 {
 221         return map_cport_to_ep(es2, cport_id, 0);
 222 }
 223 #endif
 224
 225 static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 226 {
 227         struct usb_device *udev = es2->usb_dev;
 228         u8 *data;
 229         int retval;
 230
 231         data = kmalloc(size, GFP_KERNEL);
 232         if (!data)
 233                 return -ENOMEM;
 234         memcpy(data, req, size);
 235
 236         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 237                                  cmd,
 238                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 239                                  USB_RECIP_INTERFACE,
 240                                  0, 0, data, size, ES2_TIMEOUT);
 241         if (retval < 0)
 242                 dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
 243         else
 244                 retval = 0;
 245
 246         kfree(data);
 247         return retval;
 248 }
 249
 250 static void ap_urb_complete(struct urb *urb)
 251 {
 252         struct usb_ctrlrequest *dr = urb->context;
 253
 254         kfree(dr);
 255         usb_free_urb(urb);
 256 }
 257
 258 static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 259 {
 260         struct usb_device *udev = es2->usb_dev;
 261         struct urb *urb;
 262         struct usb_ctrlrequest *dr;
 263         u8 *buf;
 264         int retval;
 265
 266         urb = usb_alloc_urb(0, GFP_ATOMIC);
 267         if (!urb)
 268                 return -ENOMEM;
 269
 270         dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
 271         if (!dr) {
 272                 usb_free_urb(urb);
 273                 return -ENOMEM;
 274         }
 275
 276         buf = (u8 *)dr + sizeof(*dr);
 277         memcpy(buf, req, size);
 278
 279         dr->bRequest = cmd;
 280         dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
 281         dr->wValue = 0;
 282         dr->wIndex = 0;
 283         dr->wLength = cpu_to_le16(size);
 284
 285         usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
 286                              (unsigned char *)dr, buf, size,
 287                              ap_urb_complete, dr);
 288         retval = usb_submit_urb(urb, GFP_ATOMIC);
 289         if (retval) {
 290                 usb_free_urb(urb);
 291                 kfree(dr);
 292         }
 293         return retval;
 294 }
 295
 296 static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
 297                      bool async)
 298 {
 299         struct es2_ap_dev *es2 = hd_to_es2(hd);
 300
 301         if (async)
 302                 return output_async(es2, req, size, cmd);
 303
 304         return output_sync(es2, req, size, cmd);
 305 }
 306
 307 static int es2_cport_in_enable(struct es2_ap_dev *es2,
 308                                 struct es2_cport_in *cport_in)
 309 {
 310         struct urb *urb;
 311         int ret;
 312         int i;
 313
 314         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 315                 urb = cport_in->urb[i];
 316
 317                 ret = usb_submit_urb(urb, GFP_KERNEL);
 318                 if (ret) {
 319                         dev_err(&es2->usb_dev->dev,
 320                                         "failed to submit in-urb: %d\n", ret);
 321                         goto err_kill_urbs;
 322                 }
 323         }
 324
 325         return 0;
 326
 327 err_kill_urbs:
 328         for (--i; i >= 0; --i) {
 329                 urb = cport_in->urb[i];
 330                 usb_kill_urb(urb);
 331         }
 332
 333         return ret;
 334 }
 335
 336 static void es2_cport_in_disable(struct es2_ap_dev *es2,
 337                                 struct es2_cport_in *cport_in)
 338 {
 339         struct urb *urb;
 340         int i;
 341
 342         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 343                 urb = cport_in->urb[i];
 344                 usb_kill_urb(urb);
 345         }
 346 }
 347
 348 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
 349 {
 350         struct urb *urb = NULL;
 351         unsigned long flags;
 352         int i;
 353
 354         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 355
 356         /* Look in our pool of allocated urbs first, as that's the "fastest" */
 357         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 358                 if (es2->cport_out_urb_busy[i] == false &&
 359                                 es2->cport_out_urb_cancelled[i] == false) {
 360                         es2->cport_out_urb_busy[i] = true;
 361                         urb = es2->cport_out_urb[i];
 362                         break;
 363                 }
 364         }
 365         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 366         if (urb)
 367                 return urb;
 368
 369         /*
 370          * Crap, pool is empty, complain to the syslog and go allocate one
 371          * dynamically as we have to succeed.
 372          */
 373         dev_dbg(&es2->usb_dev->dev,
 374                 "No free CPort OUT urbs, having to dynamically allocate one!\n");
 375         return usb_alloc_urb(0, gfp_mask);
 376 }
 377
 378 static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
 379 {
 380         unsigned long flags;
 381         int i;
 382         /*
 383          * See if this was an urb in our pool, if so mark it "free", otherwise
 384          * we need to free it ourselves.
 385          */
 386         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 387         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 388                 if (urb == es2->cport_out_urb[i]) {
 389                         es2->cport_out_urb_busy[i] = false;
 390                         urb = NULL;
 391                         break;
 392                 }
 393         }
 394         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 395
 396         /* If urb is not NULL, then we need to free this urb */
 397         usb_free_urb(urb);
 398 }
 399
 400 /*
 401  * We (ab)use the operation-message header pad bytes to transfer the
 402  * cport id in order to minimise overhead.
 403  */
 404 static void
 405 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
 406 {
 407         header->pad[0] = cport_id;
 408 }
 409
 410 /* Clear the pad bytes used for the CPort id */
 411 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
 412 {
 413         header->pad[0] = 0;
 414 }
 415
 416 /* Extract the CPort id packed into the header, and clear it */
 417 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
 418 {
 419         u16 cport_id = header->pad[0];
 420
 421         gb_message_cport_clear(header);
 422
 423         return cport_id;
 424 }
 425
 426 /*
 427  * Returns zero if the message was successfully queued, or a negative errno
 428  * otherwise.
 429  */
 430 static int message_send(struct gb_host_device *hd, u16 cport_id,
 431                         struct gb_message *message, gfp_t gfp_mask)
 432 {
 433         struct es2_ap_dev *es2 = hd_to_es2(hd);
 434         struct usb_device *udev = es2->usb_dev;
 435         size_t buffer_size;
 436         int retval;
 437         struct urb *urb;
 438         int ep_pair;
 439         unsigned long flags;
 440
 441         /*
 442          * The data actually transferred will include an indication
 443          * of where the data should be sent.  Do one last check of
 444          * the target CPort id before filling it in.
 445          */
 446         if (!cport_id_valid(hd, cport_id)) {
 447                 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
 448                 return -EINVAL;
 449         }
 450
 451         /* Find a free urb */
 452         urb = next_free_urb(es2, gfp_mask);
 453         if (!urb)
 454                 return -ENOMEM;
 455
 456         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 457         message->hcpriv = urb;
 458         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 459
 460         /* Pack the cport id into the message header */
 461         gb_message_cport_pack(message->header, cport_id);
 462
 463         buffer_size = sizeof(*message->header) + message->payload_size;
 464
 465         ep_pair = cport_to_ep_pair(es2, cport_id);
 466         usb_fill_bulk_urb(urb, udev,
 467                           usb_sndbulkpipe(udev,
 468                                           es2->cport_out[ep_pair].endpoint),
 469                           message->buffer, buffer_size,
 470                           cport_out_callback, message);
 471         urb->transfer_flags |= URB_ZERO_PACKET;
 472         trace_gb_host_device_send(hd, cport_id, buffer_size);
 473         retval = usb_submit_urb(urb, gfp_mask);
 474         if (retval) {
 475                 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
 476
 477                 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 478                 message->hcpriv = NULL;
 479                 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 480
 481                 free_urb(es2, urb);
 482                 gb_message_cport_clear(message->header);
 483
 484                 return retval;
 485         }
 486
 487         return 0;
 488 }
 489
 490 /*
 491  * Can not be called in atomic context.
 492  */
 493 static void message_cancel(struct gb_message *message)
 494 {
 495         struct gb_host_device *hd = message->operation->connection->hd;
 496         struct es2_ap_dev *es2 = hd_to_es2(hd);
 497         struct urb *urb;
 498         int i;
 499
 500         might_sleep();
 501
 502         spin_lock_irq(&es2->cport_out_urb_lock);
 503         urb = message->hcpriv;
 504
 505         /* Prevent dynamically allocated urb from being deallocated. */
 506         usb_get_urb(urb);
 507
 508         /* Prevent pre-allocated urb from being reused. */
 509         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 510                 if (urb == es2->cport_out_urb[i]) {
 511                         es2->cport_out_urb_cancelled[i] = true;
 512                         break;
 513                 }
 514         }
 515         spin_unlock_irq(&es2->cport_out_urb_lock);
 516
 517         usb_kill_urb(urb);
 518
 519         if (i < NUM_CPORT_OUT_URB) {
 520                 spin_lock_irq(&es2->cport_out_urb_lock);
 521                 es2->cport_out_urb_cancelled[i] = false;
 522                 spin_unlock_irq(&es2->cport_out_urb_lock);
 523         }
 524
 525         usb_free_urb(urb);
 526 }
 527
 528 static int cport_reset(struct gb_host_device *hd, u16 cport_id)
 529 {
 530         struct es2_ap_dev *es2 = hd_to_es2(hd);
 531         struct usb_device *udev = es2->usb_dev;
 532         int retval;
 533
 534         switch (cport_id) {
 535         case GB_SVC_CPORT_ID:
 536         case ES2_CPORT_CDSI0:
 537         case ES2_CPORT_CDSI1:
 538                 return 0;
 539         }
 540
 541         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 542                                  GB_APB_REQUEST_RESET_CPORT,
 543                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 544                                  USB_RECIP_INTERFACE, cport_id, 0,
 545                                  NULL, 0, ES2_TIMEOUT);
 546         if (retval < 0) {
 547                 dev_err(&udev->dev, "failed to reset cport %u: %d\n", cport_id,
 548                         retval);
 549                 return retval;
 550         }
 551
 552         return 0;
 553 }
 554
 555 static int es2_cport_allocate(struct gb_host_device *hd, int cport_id,
 556                                 unsigned long flags)
 557 {
 558         struct es2_ap_dev *es2 = hd_to_es2(hd);
 559         struct ida *id_map = &hd->cport_id_map;
 560         int ida_start, ida_end;
 561
 562         switch (cport_id) {
 563         case ES2_CPORT_CDSI0:
 564         case ES2_CPORT_CDSI1:
 565                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 566                 return -EBUSY;
 567         }
 568
 569         if (flags & GB_CONNECTION_FLAG_OFFLOADED &&
 570                         flags & GB_CONNECTION_FLAG_CDSI1) {
 571                 if (es2->cdsi1_in_use) {
 572                         dev_err(&hd->dev, "CDSI1 already in use\n");
 573                         return -EBUSY;
 574                 }
 575
 576                 es2->cdsi1_in_use = true;
 577
 578                 return ES2_CPORT_CDSI1;
 579         }
 580
 581         if (cport_id < 0) {
 582                 ida_start = 0;
 583                 ida_end = hd->num_cports;
 584         } else if (cport_id < hd->num_cports) {
 585                 ida_start = cport_id;
 586                 ida_end = cport_id + 1;
 587         } else {
 588                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 589                 return -EINVAL;
 590         }
 591
 592         return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
 593 }
 594
 595 static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
 596 {
 597         struct es2_ap_dev *es2 = hd_to_es2(hd);
 598
 599         switch (cport_id) {
 600         case ES2_CPORT_CDSI1:
 601                 es2->cdsi1_in_use = false;
 602                 return;
 603         }
 604
 605         ida_simple_remove(&hd->cport_id_map, cport_id);
 606 }
 607
 608 static int cport_enable(struct gb_host_device *hd, u16 cport_id)
 609 {
 610         int retval;
 611
 612         retval = cport_reset(hd, cport_id);
 613         if (retval)
 614                 return retval;
 615
 616         return 0;
 617 }
 618
 619 static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id)
 620 {
 621         int retval;
 622         struct es2_ap_dev *es2 = hd_to_es2(hd);
 623         struct usb_device *udev = es2->usb_dev;
 624
 625         if (!cport_id_valid(hd, cport_id)) {
 626                 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
 627                 return -EINVAL;
 628         }
 629
 630         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 631                                  GB_APB_REQUEST_LATENCY_TAG_EN,
 632                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 633                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 634                                  0, ES2_TIMEOUT);
 635
 636         if (retval < 0)
 637                 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
 638                         cport_id);
 639         return retval;
 640 }
 641
 642 static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
 643 {
 644         int retval;
 645         struct es2_ap_dev *es2 = hd_to_es2(hd);
 646         struct usb_device *udev = es2->usb_dev;
 647
 648         if (!cport_id_valid(hd, cport_id)) {
 649                 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
 650                 return -EINVAL;
 651         }
 652
 653         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 654                                  GB_APB_REQUEST_LATENCY_TAG_DIS,
 655                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 656                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 657                                  0, ES2_TIMEOUT);
 658
 659         if (retval < 0)
 660                 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
 661                         cport_id);
 662         return retval;
 663 }
 664
 665 static int cport_features_enable(struct gb_host_device *hd, u16 cport_id)
 666 {
 667         int retval;
 668         struct es2_ap_dev *es2 = hd_to_es2(hd);
 669         struct usb_device *udev = es2->usb_dev;
 670
 671         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 672                                  GB_APB_REQUEST_CPORT_FEAT_EN,
 673                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 674                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 675                                  0, ES2_TIMEOUT);
 676         if (retval < 0)
 677                 dev_err(&udev->dev, "Cannot enable CPort features for cport %u: %d\n",
 678                         cport_id, retval);
 679         return retval;
 680 }
 681
 682 static int cport_features_disable(struct gb_host_device *hd, u16 cport_id)
 683 {
 684         int retval;
 685         struct es2_ap_dev *es2 = hd_to_es2(hd);
 686         struct usb_device *udev = es2->usb_dev;
 687
 688         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 689                                  GB_APB_REQUEST_CPORT_FEAT_DIS,
 690                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 691                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 692                                  0, ES2_TIMEOUT);
 693         if (retval < 0)
 694                 dev_err(&udev->dev,
 695                         "Cannot disable CPort features for cport %u: %d\n",
 696                         cport_id, retval);
 697         return retval;
 698 }
 699
 700 static int timesync_enable(struct gb_host_device *hd, u8 count,
 701                            u64 frame_time, u32 strobe_delay, u32 refclk)
 702 {
 703         int retval;
 704         struct es2_ap_dev *es2 = hd_to_es2(hd);
 705         struct usb_device *udev = es2->usb_dev;
 706         struct gb_control_timesync_enable_request *request;
 707
 708         request = kzalloc(sizeof(*request), GFP_KERNEL);
 709         if (!request)
 710                 return -ENOMEM;
 711
 712         request->count = count;
 713         request->frame_time = cpu_to_le64(frame_time);
 714         request->strobe_delay = cpu_to_le32(strobe_delay);
 715         request->refclk = cpu_to_le32(refclk);
 716         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 717                                  REQUEST_TIMESYNC_ENABLE,
 718                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 719                                  USB_RECIP_INTERFACE, 0, 0, request,
 720                                  sizeof(*request), ES2_TIMEOUT);
 721         if (retval < 0)
 722                 dev_err(&udev->dev, "Cannot enable timesync %d\n", retval);
 723
 724         kfree(request);
 725         return retval;
 726 }
 727
 728 static int timesync_disable(struct gb_host_device *hd)
 729 {
 730         int retval;
 731         struct es2_ap_dev *es2 = hd_to_es2(hd);
 732         struct usb_device *udev = es2->usb_dev;
 733
 734         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 735                                  REQUEST_TIMESYNC_DISABLE,
 736                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 737                                  USB_RECIP_INTERFACE, 0, 0, NULL,
 738                                  0, ES2_TIMEOUT);
 739         if (retval < 0)
 740                 dev_err(&udev->dev, "Cannot disable timesync %d\n", retval);
 741
 742         return retval;
 743 }
 744
 745 static int timesync_authoritative(struct gb_host_device *hd, u64 *frame_time)
 746 {
 747         int retval, i;
 748         struct es2_ap_dev *es2 = hd_to_es2(hd);
 749         struct usb_device *udev = es2->usb_dev;
 750         struct timesync_authoritative_request *request;
 751
 752         request = kzalloc(sizeof(*request), GFP_KERNEL);
 753         if (!request)
 754                 return -ENOMEM;
 755
 756         for (i = 0; i < GB_TIMESYNC_MAX_STROBES; i++)
 757                 request->frame_time[i] = cpu_to_le64(frame_time[i]);
 758
 759         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 760                                  REQUEST_TIMESYNC_AUTHORITATIVE,
 761                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 762                                  USB_RECIP_INTERFACE, 0, 0, request,
 763                                  sizeof(*request), ES2_TIMEOUT);
 764         if (retval < 0)
 765                 dev_err(&udev->dev, "Cannot timesync authoritative out %d\n", retval);
 766
 767         kfree(request);
 768         return retval;
 769 }
 770
 771 static int timesync_get_last_event(struct gb_host_device *hd, u64 *frame_time)
 772 {
 773         int retval;
 774         struct es2_ap_dev *es2 = hd_to_es2(hd);
 775         struct usb_device *udev = es2->usb_dev;
 776         __le64 *response_frame_time;
 777
 778         response_frame_time = kzalloc(sizeof(*response_frame_time), GFP_KERNEL);
 779         if (!response_frame_time)
 780                 return -ENOMEM;
 781
 782         retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 783                                  REQUEST_TIMESYNC_GET_LAST_EVENT,
 784                                  USB_DIR_IN | USB_TYPE_VENDOR |
 785                                  USB_RECIP_INTERFACE, 0, 0, response_frame_time,
 786                                  sizeof(*response_frame_time), ES2_TIMEOUT);
 787
 788         if (retval != sizeof(*response_frame_time)) {
 789                 dev_err(&udev->dev, "Cannot get last TimeSync event: %d\n",
 790                         retval);
 791
 792                 if (retval >= 0)
 793                         retval = -EIO;
 794
 795                 goto out;
 796         }
 797         *frame_time = le64_to_cpu(*response_frame_time);
 798         retval = 0;
 799 out:
 800         kfree(response_frame_time);
 801         return retval;
 802 }
 803
 804 static struct gb_hd_driver es2_driver = {
 805         .hd_priv_size                   = sizeof(struct es2_ap_dev),
 806         .message_send                   = message_send,
 807         .message_cancel                 = message_cancel,
 808         .cport_allocate                 = es2_cport_allocate,
 809         .cport_release                  = es2_cport_release,
 810         .cport_enable                   = cport_enable,
 811         .latency_tag_enable             = latency_tag_enable,
 812         .latency_tag_disable            = latency_tag_disable,
 813         .output                         = output,
 814         .cport_features_enable          = cport_features_enable,
 815         .cport_features_disable         = cport_features_disable,
 816         .timesync_enable                = timesync_enable,
 817         .timesync_disable               = timesync_disable,
 818         .timesync_authoritative         = timesync_authoritative,
 819         .timesync_get_last_event        = timesync_get_last_event,
 820 };
 821
 822 /* Common function to report consistent warnings based on URB status */
 823 static int check_urb_status(struct urb *urb)
 824 {
 825         struct device *dev = &urb->dev->dev;
 826         int status = urb->status;
 827
 828         switch (status) {
 829         case 0:
 830                 return 0;
 831
 832         case -EOVERFLOW:
 833                 dev_err(dev, "%s: overflow actual length is %d\n",
 834                         __func__, urb->actual_length);
 835         case -ECONNRESET:
 836         case -ENOENT:
 837         case -ESHUTDOWN:
 838         case -EILSEQ:
 839         case -EPROTO:
 840                 /* device is gone, stop sending */
 841                 return status;
 842         }
 843         dev_err(dev, "%s: unknown status %d\n", __func__, status);
 844
 845         return -EAGAIN;
 846 }
 847
 848 static void es2_destroy(struct es2_ap_dev *es2)
 849 {
 850         struct usb_device *udev;
 851         int bulk_in;
 852         int i;
 853
 854         debugfs_remove(es2->apb_log_enable_dentry);
 855         usb_log_disable(es2);
 856
 857         /* Tear down everything! */
 858         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 859                 struct urb *urb = es2->cport_out_urb[i];
 860
 861                 if (!urb)
 862                         break;
 863                 usb_kill_urb(urb);
 864                 usb_free_urb(urb);
 865                 es2->cport_out_urb[i] = NULL;
 866                 es2->cport_out_urb_busy[i] = false;     /* just to be anal */
 867         }
 868
 869         for (bulk_in = 0; bulk_in < NUM_BULKS; bulk_in++) {
 870                 struct es2_cport_in *cport_in = &es2->cport_in[bulk_in];
 871
 872                 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 873                         struct urb *urb = cport_in->urb[i];
 874
 875                         if (!urb)
 876                                 break;
 877                         usb_free_urb(urb);
 878                         kfree(cport_in->buffer[i]);
 879                         cport_in->buffer[i] = NULL;
 880                 }
 881         }
 882
 883         kfree(es2->cport_to_ep);
 884
 885         udev = es2->usb_dev;
 886         gb_hd_put(es2->hd);
 887
 888         usb_put_dev(udev);
 889 }
 890
 891 static void cport_in_callback(struct urb *urb)
 892 {
 893         struct gb_host_device *hd = urb->context;
 894         struct device *dev = &urb->dev->dev;
 895         struct gb_operation_msg_hdr *header;
 896         int status = check_urb_status(urb);
 897         int retval;
 898         u16 cport_id;
 899
 900         if (status) {
 901                 if ((status == -EAGAIN) || (status == -EPROTO))
 902                         goto exit;
 903
 904                 /* The urb is being unlinked */
 905                 if (status == -ENOENT || status == -ESHUTDOWN)
 906                         return;
 907
 908                 dev_err(dev, "urb cport in error %d (dropped)\n", status);
 909                 return;
 910         }
 911
 912         if (urb->actual_length < sizeof(*header)) {
 913                 dev_err(dev, "short message received\n");
 914                 goto exit;
 915         }
 916
 917         /* Extract the CPort id, which is packed in the message header */
 918         header = urb->transfer_buffer;
 919         cport_id = gb_message_cport_unpack(header);
 920
 921         if (cport_id_valid(hd, cport_id)) {
 922                 trace_gb_host_device_recv(hd, cport_id, urb->actual_length);
 923                 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
 924                                                         urb->actual_length);
 925         } else {
 926                 dev_err(dev, "invalid cport id %u received\n", cport_id);
 927         }
 928 exit:
 929         /* put our urb back in the request pool */
 930         retval = usb_submit_urb(urb, GFP_ATOMIC);
 931         if (retval)
 932                 dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
 933 }
 934
 935 static void cport_out_callback(struct urb *urb)
 936 {
 937         struct gb_message *message = urb->context;
 938         struct gb_host_device *hd = message->operation->connection->hd;
 939         struct es2_ap_dev *es2 = hd_to_es2(hd);
 940         int status = check_urb_status(urb);
 941         unsigned long flags;
 942
 943         gb_message_cport_clear(message->header);
 944
 945         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 946         message->hcpriv = NULL;
 947         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 948
 949         /*
 950          * Tell the submitter that the message send (attempt) is
 951          * complete, and report the status.
 952          */
 953         greybus_message_sent(hd, message, status);
 954
 955         free_urb(es2, urb);
 956 }
 957
 958 #define APB1_LOG_MSG_SIZE       64
 959 static void apb_log_get(struct es2_ap_dev *es2, char *buf)
 960 {
 961         int retval;
 962
 963         /* SVC messages go down our control pipe */
 964         do {
 965                 retval = usb_control_msg(es2->usb_dev,
 966                                         usb_rcvctrlpipe(es2->usb_dev, 0),
 967                                         GB_APB_REQUEST_LOG,
 968                                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 969                                         0x00, 0x00,
 970                                         buf,
 971                                         APB1_LOG_MSG_SIZE,
 972                                         ES2_TIMEOUT);
 973                 if (retval > 0)
 974                         kfifo_in(&es2->apb_log_fifo, buf, retval);
 975         } while (retval > 0);
 976 }
 977
 978 static int apb_log_poll(void *data)
 979 {
 980         struct es2_ap_dev *es2 = data;
 981         char *buf;
 982
 983         buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
 984         if (!buf)
 985                 return -ENOMEM;
 986
 987         while (!kthread_should_stop()) {
 988                 msleep(1000);
 989                 apb_log_get(es2, buf);
 990         }
 991
 992         kfree(buf);
 993
 994         return 0;
 995 }
 996
 997 static ssize_t apb_log_read(struct file *f, char __user *buf,
 998                                 size_t count, loff_t *ppos)
 999 {
1000         struct es2_ap_dev *es2 = f->f_inode->i_private;
1001         ssize_t ret;
1002         size_t copied;
1003         char *tmp_buf;
1004
1005         if (count > APB1_LOG_SIZE)
1006                 count = APB1_LOG_SIZE;
1007
1008         tmp_buf = kmalloc(count, GFP_KERNEL);
1009         if (!tmp_buf)
1010                 return -ENOMEM;
1011
1012         copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count);
1013         ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
1014
1015         kfree(tmp_buf);
1016
1017         return ret;
1018 }
1019
1020 static const struct file_operations apb_log_fops = {
1021         .read   = apb_log_read,
1022 };
1023
1024 static void usb_log_enable(struct es2_ap_dev *es2)
1025 {
1026         if (!IS_ERR_OR_NULL(es2->apb_log_task))
1027                 return;
1028
1029         /* get log from APB1 */
1030         es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log");
1031         if (IS_ERR(es2->apb_log_task))
1032                 return;
1033         /* XXX We will need to rename this per APB */
1034         es2->apb_log_dentry = debugfs_create_file("apb_log", S_IRUGO,
1035                                                 gb_debugfs_get(), es2,
1036                                                 &apb_log_fops);
1037 }
1038
1039 static void usb_log_disable(struct es2_ap_dev *es2)
1040 {
1041         if (IS_ERR_OR_NULL(es2->apb_log_task))
1042                 return;
1043
1044         debugfs_remove(es2->apb_log_dentry);
1045         es2->apb_log_dentry = NULL;
1046
1047         kthread_stop(es2->apb_log_task);
1048         es2->apb_log_task = NULL;
1049 }
1050
1051 static ssize_t apb_log_enable_read(struct file *f, char __user *buf,
1052                                 size_t count, loff_t *ppos)
1053 {
1054         struct es2_ap_dev *es2 = f->f_inode->i_private;
1055         int enable = !IS_ERR_OR_NULL(es2->apb_log_task);
1056         char tmp_buf[3];
1057
1058         sprintf(tmp_buf, "%d\n", enable);
1059         return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
1060 }
1061
1062 static ssize_t apb_log_enable_write(struct file *f, const char __user *buf,
1063                                 size_t count, loff_t *ppos)
1064 {
1065         int enable;
1066         ssize_t retval;
1067         struct es2_ap_dev *es2 = f->f_inode->i_private;
1068
1069         retval = kstrtoint_from_user(buf, count, 10, &enable);
1070         if (retval)
1071                 return retval;
1072
1073         if (enable)
1074                 usb_log_enable(es2);
1075         else
1076                 usb_log_disable(es2);
1077
1078         return count;
1079 }
1080
1081 static const struct file_operations apb_log_enable_fops = {
1082         .read   = apb_log_enable_read,
1083         .write  = apb_log_enable_write,
1084 };
1085
1086 static int apb_get_cport_count(struct usb_device *udev)
1087 {
1088         int retval;
1089         __le16 *cport_count;
1090
1091         cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL);
1092         if (!cport_count)
1093                 return -ENOMEM;
1094
1095         retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
1096                                  GB_APB_REQUEST_CPORT_COUNT,
1097                                  USB_DIR_IN | USB_TYPE_VENDOR |
1098                                  USB_RECIP_INTERFACE, 0, 0, cport_count,
1099                                  sizeof(*cport_count), ES2_TIMEOUT);
1100         if (retval != sizeof(*cport_count)) {
1101                 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1102                         retval);
1103
1104                 if (retval >= 0)
1105                         retval = -EIO;
1106
1107                 goto out;
1108         }
1109
1110         retval = le16_to_cpu(*cport_count);
1111
1112         /* We need to fit a CPort ID in one byte of a message header */
1113         if (retval > U8_MAX) {
1114                 retval = U8_MAX;
1115                 dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n");
1116         }
1117
1118 out:
1119         kfree(cport_count);
1120         return retval;
1121 }
1122
1123 /*
1124  * The ES2 USB Bridge device has 15 endpoints
1125  * 1 Control - usual USB stuff + AP -> APBridgeA messages
1126  * 7 Bulk IN - CPort data in
1127  * 7 Bulk OUT - CPort data out
1128  */
1129 static int ap_probe(struct usb_interface *interface,
1130                     const struct usb_device_id *id)
1131 {
1132         struct es2_ap_dev *es2;
1133         struct gb_host_device *hd;
1134         struct usb_device *udev;
1135         struct usb_host_interface *iface_desc;
1136         struct usb_endpoint_descriptor *endpoint;
1137         int bulk_in = 0;
1138         int bulk_out = 0;
1139         int retval;
1140         int i;
1141         int num_cports;
1142
1143         udev = usb_get_dev(interface_to_usbdev(interface));
1144
1145         num_cports = apb_get_cport_count(udev);
1146         if (num_cports < 0) {
1147                 usb_put_dev(udev);
1148                 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1149                         num_cports);
1150                 return num_cports;
1151         }
1152
1153         hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX,
1154                                 num_cports);
1155         if (IS_ERR(hd)) {
1156                 usb_put_dev(udev);
1157                 return PTR_ERR(hd);
1158         }
1159
1160         es2 = hd_to_es2(hd);
1161         es2->hd = hd;
1162         es2->usb_intf = interface;
1163         es2->usb_dev = udev;
1164         spin_lock_init(&es2->cport_out_urb_lock);
1165         INIT_KFIFO(es2->apb_log_fifo);
1166         usb_set_intfdata(interface, es2);
1167
1168         /*
1169          * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated
1170          * dynamically.
1171          */
1172         retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0);
1173         if (retval)
1174                 goto error;
1175         retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1);
1176         if (retval)
1177                 goto error;
1178
1179         es2->cport_to_ep = kcalloc(hd->num_cports, sizeof(*es2->cport_to_ep),
1180                                    GFP_KERNEL);
1181         if (!es2->cport_to_ep) {
1182                 retval = -ENOMEM;
1183                 goto error;
1184         }
1185
1186         /* find all bulk endpoints */
1187         iface_desc = interface->cur_altsetting;
1188         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1189                 endpoint = &iface_desc->endpoint[i].desc;
1190
1191                 if (usb_endpoint_is_bulk_in(endpoint)) {
1192                         es2->cport_in[bulk_in++].endpoint =
1193                                 endpoint->bEndpointAddress;
1194                 } else if (usb_endpoint_is_bulk_out(endpoint)) {
1195                         es2->cport_out[bulk_out++].endpoint =
1196                                 endpoint->bEndpointAddress;
1197                 } else {
1198                         dev_err(&udev->dev,
1199                                 "Unknown endpoint type found, address 0x%02x\n",
1200                                 endpoint->bEndpointAddress);
1201                 }
1202         }
1203         if (bulk_in != NUM_BULKS || bulk_out != NUM_BULKS) {
1204                 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
1205                 retval = -ENODEV;
1206                 goto error;
1207         }
1208
1209         /* Allocate buffers for our cport in messages */
1210         for (bulk_in = 0; bulk_in < NUM_BULKS; bulk_in++) {
1211                 struct es2_cport_in *cport_in = &es2->cport_in[bulk_in];
1212
1213                 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
1214                         struct urb *urb;
1215                         u8 *buffer;
1216
1217                         urb = usb_alloc_urb(0, GFP_KERNEL);
1218                         if (!urb) {
1219                                 retval = -ENOMEM;
1220                                 goto error;
1221                         }
1222                         buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
1223                         if (!buffer) {
1224                                 retval = -ENOMEM;
1225                                 goto error;
1226                         }
1227
1228                         usb_fill_bulk_urb(urb, udev,
1229                                           usb_rcvbulkpipe(udev,
1230                                                           cport_in->endpoint),
1231                                           buffer, ES2_GBUF_MSG_SIZE_MAX,
1232                                           cport_in_callback, hd);
1233                         cport_in->urb[i] = urb;
1234                         cport_in->buffer[i] = buffer;
1235                 }
1236         }
1237
1238         /* Allocate urbs for our CPort OUT messages */
1239         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
1240                 struct urb *urb;
1241
1242                 urb = usb_alloc_urb(0, GFP_KERNEL);
1243                 if (!urb) {
1244                         retval = -ENOMEM;
1245                         goto error;
1246                 }
1247
1248                 es2->cport_out_urb[i] = urb;
1249                 es2->cport_out_urb_busy[i] = false;     /* just to be anal */
1250         }
1251
1252         /* XXX We will need to rename this per APB */
1253         es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable",
1254                                                         (S_IWUSR | S_IRUGO),
1255                                                         gb_debugfs_get(), es2,
1256                                                         &apb_log_enable_fops);
1257
1258         retval = gb_hd_add(hd);
1259         if (retval)
1260                 goto error;
1261
1262         for (i = 0; i < NUM_BULKS; ++i) {
1263                 retval = es2_cport_in_enable(es2, &es2->cport_in[i]);
1264                 if (retval)
1265                         goto err_disable_cport_in;
1266         }
1267
1268         return 0;
1269
1270 err_disable_cport_in:
1271         for (--i; i >= 0; --i)
1272                 es2_cport_in_disable(es2, &es2->cport_in[i]);
1273         gb_hd_del(hd);
1274 error:
1275         es2_destroy(es2);
1276
1277         return retval;
1278 }
1279
1280 static void ap_disconnect(struct usb_interface *interface)
1281 {
1282         struct es2_ap_dev *es2 = usb_get_intfdata(interface);
1283         int i;
1284
1285         gb_hd_del(es2->hd);
1286
1287         for (i = 0; i < NUM_BULKS; ++i)
1288                 es2_cport_in_disable(es2, &es2->cport_in[i]);
1289
1290         es2_destroy(es2);
1291 }
1292
1293 static struct usb_driver es2_ap_driver = {
1294         .name =         "es2_ap_driver",
1295         .probe =        ap_probe,
1296         .disconnect =   ap_disconnect,
1297         .id_table =     id_table,
1298         .soft_unbind =  1,
1299 };
1300
1301 module_usb_driver(es2_ap_driver);
1302
1303 MODULE_LICENSE("GPL v2");
1304 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");