drivers/greybus/es2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Greybus "AP" USB driver for "ES2" controller chips
   4  *
   5  * Copyright 2014-2015 Google Inc.
   6  * Copyright 2014-2015 Linaro Ltd.
   7  */
   8 #include <linux/kthread.h>
   9 #include <linux/sizes.h>
  10 #include <linux/usb.h>
  11 #include <linux/kfifo.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/list.h>
  14 #include <linux/greybus.h>
  15 #include <asm/unaligned.h>
  16
  17 #include "arpc.h"
  18 #include "greybus_trace.h"
  19
  20
  21 /* Default timeout for USB vendor requests. */
  22 #define ES2_USB_CTRL_TIMEOUT    500
  23
  24 /* Default timeout for ARPC CPort requests */
  25 #define ES2_ARPC_CPORT_TIMEOUT  500
  26
  27 /* Fixed CPort numbers */
  28 #define ES2_CPORT_CDSI0         16
  29 #define ES2_CPORT_CDSI1         17
  30
  31 /* Memory sizes for the buffers sent to/from the ES2 controller */
  32 #define ES2_GBUF_MSG_SIZE_MAX   2048
  33
  34 /* Memory sizes for the ARPC buffers */
  35 #define ARPC_OUT_SIZE_MAX       U16_MAX
  36 #define ARPC_IN_SIZE_MAX        128
  37
  38 static const struct usb_device_id id_table[] = {
  39         { USB_DEVICE(0x18d1, 0x1eaf) },
  40         { },
  41 };
  42 MODULE_DEVICE_TABLE(usb, id_table);
  43
  44 #define APB1_LOG_SIZE           SZ_16K
  45
  46 /*
  47  * Number of CPort IN urbs in flight at any point in time.
  48  * Adjust if we are having stalls in the USB buffer due to not enough urbs in
  49  * flight.
  50  */
  51 #define NUM_CPORT_IN_URB        4
  52
  53 /* Number of CPort OUT urbs in flight at any point in time.
  54  * Adjust if we get messages saying we are out of urbs in the system log.
  55  */
  56 #define NUM_CPORT_OUT_URB       8
  57
  58 /*
  59  * Number of ARPC in urbs in flight at any point in time.
  60  */
  61 #define NUM_ARPC_IN_URB         2
  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 es2_cport_in {
  69         __u8 endpoint;
  70         struct urb *urb[NUM_CPORT_IN_URB];
  71         u8 *buffer[NUM_CPORT_IN_URB];
  72 };
  73
  74 /**
  75  * struct es2_ap_dev - ES2 USB Bridge to AP structure
  76  * @usb_dev: pointer to the USB device we are.
  77  * @usb_intf: pointer to the USB interface we are bound to.
  78  * @hd: pointer to our gb_host_device structure
  79  *
  80  * @cport_in: endpoint, urbs and buffer for cport in messages
  81  * @cport_out_endpoint: endpoint for for cport out messages
  82  * @cport_out_urb: array of urbs for the CPort out messages
  83  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
  84  *                      not.
  85  * @cport_out_urb_cancelled: array of flags indicating whether the
  86  *                      corresponding @cport_out_urb is being cancelled
  87  * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
  88  * @cdsi1_in_use: true if cport CDSI1 is in use
  89  * @apb_log_task: task pointer for logging thread
  90  * @apb_log_dentry: file system entry for the log file interface
  91  * @apb_log_enable_dentry: file system entry for enabling logging
  92  * @apb_log_fifo: kernel FIFO to carry logged data
  93  * @arpc_urb: array of urbs for the ARPC in messages
  94  * @arpc_buffer: array of buffers for the @arpc_urb urbs
  95  * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC
  96  * @arpc_id_cycle: gives an unique id to ARPC
  97  * @arpc_lock: locks ARPC list
  98  * @arpcs: list of in progress ARPCs
  99  */
 100 struct es2_ap_dev {
 101         struct usb_device *usb_dev;
 102         struct usb_interface *usb_intf;
 103         struct gb_host_device *hd;
 104
 105         struct es2_cport_in cport_in;
 106         __u8 cport_out_endpoint;
 107         struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
 108         bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
 109         bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
 110         spinlock_t cport_out_urb_lock;
 111
 112         bool cdsi1_in_use;
 113
 114         struct task_struct *apb_log_task;
 115         struct dentry *apb_log_dentry;
 116         struct dentry *apb_log_enable_dentry;
 117         DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);
 118
 119         __u8 arpc_endpoint_in;
 120         struct urb *arpc_urb[NUM_ARPC_IN_URB];
 121         u8 *arpc_buffer[NUM_ARPC_IN_URB];
 122
 123         int arpc_id_cycle;
 124         spinlock_t arpc_lock;
 125         struct list_head arpcs;
 126 };
 127
 128 struct arpc {
 129         struct list_head list;
 130         struct arpc_request_message *req;
 131         struct arpc_response_message *resp;
 132         struct completion response_received;
 133         bool active;
 134 };
 135
 136 static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
 137 {
 138         return (struct es2_ap_dev *)&hd->hd_priv;
 139 }
 140
 141 static void cport_out_callback(struct urb *urb);
 142 static void usb_log_enable(struct es2_ap_dev *es2);
 143 static void usb_log_disable(struct es2_ap_dev *es2);
 144 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
 145                      size_t size, int *result, unsigned int timeout);
 146
 147 static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 148 {
 149         struct usb_device *udev = es2->usb_dev;
 150         u8 *data;
 151         int retval;
 152
 153         data = kmemdup(req, size, GFP_KERNEL);
 154         if (!data)
 155                 return -ENOMEM;
 156
 157         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 158                                  cmd,
 159                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 160                                  USB_RECIP_INTERFACE,
 161                                  0, 0, data, size, ES2_USB_CTRL_TIMEOUT);
 162         if (retval < 0)
 163                 dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
 164         else
 165                 retval = 0;
 166
 167         kfree(data);
 168         return retval;
 169 }
 170
 171 static void ap_urb_complete(struct urb *urb)
 172 {
 173         struct usb_ctrlrequest *dr = urb->context;
 174
 175         kfree(dr);
 176         usb_free_urb(urb);
 177 }
 178
 179 static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 180 {
 181         struct usb_device *udev = es2->usb_dev;
 182         struct urb *urb;
 183         struct usb_ctrlrequest *dr;
 184         u8 *buf;
 185         int retval;
 186
 187         urb = usb_alloc_urb(0, GFP_ATOMIC);
 188         if (!urb)
 189                 return -ENOMEM;
 190
 191         dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
 192         if (!dr) {
 193                 usb_free_urb(urb);
 194                 return -ENOMEM;
 195         }
 196
 197         buf = (u8 *)dr + sizeof(*dr);
 198         memcpy(buf, req, size);
 199
 200         dr->bRequest = cmd;
 201         dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
 202         dr->wValue = 0;
 203         dr->wIndex = 0;
 204         dr->wLength = cpu_to_le16(size);
 205
 206         usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
 207                              (unsigned char *)dr, buf, size,
 208                              ap_urb_complete, dr);
 209         retval = usb_submit_urb(urb, GFP_ATOMIC);
 210         if (retval) {
 211                 usb_free_urb(urb);
 212                 kfree(dr);
 213         }
 214         return retval;
 215 }
 216
 217 static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
 218                   bool async)
 219 {
 220         struct es2_ap_dev *es2 = hd_to_es2(hd);
 221
 222         if (async)
 223                 return output_async(es2, req, size, cmd);
 224
 225         return output_sync(es2, req, size, cmd);
 226 }
 227
 228 static int es2_cport_in_enable(struct es2_ap_dev *es2,
 229                                struct es2_cport_in *cport_in)
 230 {
 231         struct urb *urb;
 232         int ret;
 233         int i;
 234
 235         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 236                 urb = cport_in->urb[i];
 237
 238                 ret = usb_submit_urb(urb, GFP_KERNEL);
 239                 if (ret) {
 240                         dev_err(&es2->usb_dev->dev,
 241                                 "failed to submit in-urb: %d\n", ret);
 242                         goto err_kill_urbs;
 243                 }
 244         }
 245
 246         return 0;
 247
 248 err_kill_urbs:
 249         for (--i; i >= 0; --i) {
 250                 urb = cport_in->urb[i];
 251                 usb_kill_urb(urb);
 252         }
 253
 254         return ret;
 255 }
 256
 257 static void es2_cport_in_disable(struct es2_ap_dev *es2,
 258                                  struct es2_cport_in *cport_in)
 259 {
 260         struct urb *urb;
 261         int i;
 262
 263         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 264                 urb = cport_in->urb[i];
 265                 usb_kill_urb(urb);
 266         }
 267 }
 268
 269 static int es2_arpc_in_enable(struct es2_ap_dev *es2)
 270 {
 271         struct urb *urb;
 272         int ret;
 273         int i;
 274
 275         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 276                 urb = es2->arpc_urb[i];
 277
 278                 ret = usb_submit_urb(urb, GFP_KERNEL);
 279                 if (ret) {
 280                         dev_err(&es2->usb_dev->dev,
 281                                 "failed to submit arpc in-urb: %d\n", ret);
 282                         goto err_kill_urbs;
 283                 }
 284         }
 285
 286         return 0;
 287
 288 err_kill_urbs:
 289         for (--i; i >= 0; --i) {
 290                 urb = es2->arpc_urb[i];
 291                 usb_kill_urb(urb);
 292         }
 293
 294         return ret;
 295 }
 296
 297 static void es2_arpc_in_disable(struct es2_ap_dev *es2)
 298 {
 299         struct urb *urb;
 300         int i;
 301
 302         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 303                 urb = es2->arpc_urb[i];
 304                 usb_kill_urb(urb);
 305         }
 306 }
 307
 308 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
 309 {
 310         struct urb *urb = NULL;
 311         unsigned long flags;
 312         int i;
 313
 314         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 315
 316         /* Look in our pool of allocated urbs first, as that's the "fastest" */
 317         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 318                 if (!es2->cport_out_urb_busy[i] &&
 319                     !es2->cport_out_urb_cancelled[i]) {
 320                         es2->cport_out_urb_busy[i] = true;
 321                         urb = es2->cport_out_urb[i];
 322                         break;
 323                 }
 324         }
 325         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 326         if (urb)
 327                 return urb;
 328
 329         /*
 330          * Crap, pool is empty, complain to the syslog and go allocate one
 331          * dynamically as we have to succeed.
 332          */
 333         dev_dbg(&es2->usb_dev->dev,
 334                 "No free CPort OUT urbs, having to dynamically allocate one!\n");
 335         return usb_alloc_urb(0, gfp_mask);
 336 }
 337
 338 static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
 339 {
 340         unsigned long flags;
 341         int i;
 342         /*
 343          * See if this was an urb in our pool, if so mark it "free", otherwise
 344          * we need to free it ourselves.
 345          */
 346         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 347         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 348                 if (urb == es2->cport_out_urb[i]) {
 349                         es2->cport_out_urb_busy[i] = false;
 350                         urb = NULL;
 351                         break;
 352                 }
 353         }
 354         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 355
 356         /* If urb is not NULL, then we need to free this urb */
 357         usb_free_urb(urb);
 358 }
 359
 360 /*
 361  * We (ab)use the operation-message header pad bytes to transfer the
 362  * cport id in order to minimise overhead.
 363  */
 364 static void
 365 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
 366 {
 367         header->pad[0] = cport_id;
 368 }
 369
 370 /* Clear the pad bytes used for the CPort id */
 371 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
 372 {
 373         header->pad[0] = 0;
 374 }
 375
 376 /* Extract the CPort id packed into the header, and clear it */
 377 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
 378 {
 379         u16 cport_id = header->pad[0];
 380
 381         gb_message_cport_clear(header);
 382
 383         return cport_id;
 384 }
 385
 386 /*
 387  * Returns zero if the message was successfully queued, or a negative errno
 388  * otherwise.
 389  */
 390 static int message_send(struct gb_host_device *hd, u16 cport_id,
 391                         struct gb_message *message, gfp_t gfp_mask)
 392 {
 393         struct es2_ap_dev *es2 = hd_to_es2(hd);
 394         struct usb_device *udev = es2->usb_dev;
 395         size_t buffer_size;
 396         int retval;
 397         struct urb *urb;
 398         unsigned long flags;
 399
 400         /*
 401          * The data actually transferred will include an indication
 402          * of where the data should be sent.  Do one last check of
 403          * the target CPort id before filling it in.
 404          */
 405         if (!cport_id_valid(hd, cport_id)) {
 406                 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
 407                 return -EINVAL;
 408         }
 409
 410         /* Find a free urb */
 411         urb = next_free_urb(es2, gfp_mask);
 412         if (!urb)
 413                 return -ENOMEM;
 414
 415         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 416         message->hcpriv = urb;
 417         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 418
 419         /* Pack the cport id into the message header */
 420         gb_message_cport_pack(message->header, cport_id);
 421
 422         buffer_size = sizeof(*message->header) + message->payload_size;
 423
 424         usb_fill_bulk_urb(urb, udev,
 425                           usb_sndbulkpipe(udev,
 426                                           es2->cport_out_endpoint),
 427                           message->buffer, buffer_size,
 428                           cport_out_callback, message);
 429         urb->transfer_flags |= URB_ZERO_PACKET;
 430
 431         trace_gb_message_submit(message);
 432
 433         retval = usb_submit_urb(urb, gfp_mask);
 434         if (retval) {
 435                 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
 436
 437                 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 438                 message->hcpriv = NULL;
 439                 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 440
 441                 free_urb(es2, urb);
 442                 gb_message_cport_clear(message->header);
 443
 444                 return retval;
 445         }
 446
 447         return 0;
 448 }
 449
 450 /*
 451  * Can not be called in atomic context.
 452  */
 453 static void message_cancel(struct gb_message *message)
 454 {
 455         struct gb_host_device *hd = message->operation->connection->hd;
 456         struct es2_ap_dev *es2 = hd_to_es2(hd);
 457         struct urb *urb;
 458         int i;
 459
 460         might_sleep();
 461
 462         spin_lock_irq(&es2->cport_out_urb_lock);
 463         urb = message->hcpriv;
 464
 465         /* Prevent dynamically allocated urb from being deallocated. */
 466         usb_get_urb(urb);
 467
 468         /* Prevent pre-allocated urb from being reused. */
 469         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 470                 if (urb == es2->cport_out_urb[i]) {
 471                         es2->cport_out_urb_cancelled[i] = true;
 472                         break;
 473                 }
 474         }
 475         spin_unlock_irq(&es2->cport_out_urb_lock);
 476
 477         usb_kill_urb(urb);
 478
 479         if (i < NUM_CPORT_OUT_URB) {
 480                 spin_lock_irq(&es2->cport_out_urb_lock);
 481                 es2->cport_out_urb_cancelled[i] = false;
 482                 spin_unlock_irq(&es2->cport_out_urb_lock);
 483         }
 484
 485         usb_free_urb(urb);
 486 }
 487
 488 static int es2_cport_allocate(struct gb_host_device *hd, int cport_id,
 489                               unsigned long flags)
 490 {
 491         struct es2_ap_dev *es2 = hd_to_es2(hd);
 492         struct ida *id_map = &hd->cport_id_map;
 493         int ida_start, ida_end;
 494
 495         switch (cport_id) {
 496         case ES2_CPORT_CDSI0:
 497         case ES2_CPORT_CDSI1:
 498                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 499                 return -EBUSY;
 500         }
 501
 502         if (flags & GB_CONNECTION_FLAG_OFFLOADED &&
 503             flags & GB_CONNECTION_FLAG_CDSI1) {
 504                 if (es2->cdsi1_in_use) {
 505                         dev_err(&hd->dev, "CDSI1 already in use\n");
 506                         return -EBUSY;
 507                 }
 508
 509                 es2->cdsi1_in_use = true;
 510
 511                 return ES2_CPORT_CDSI1;
 512         }
 513
 514         if (cport_id < 0) {
 515                 ida_start = 0;
 516                 ida_end = hd->num_cports;
 517         } else if (cport_id < hd->num_cports) {
 518                 ida_start = cport_id;
 519                 ida_end = cport_id + 1;
 520         } else {
 521                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 522                 return -EINVAL;
 523         }
 524
 525         return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
 526 }
 527
 528 static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
 529 {
 530         struct es2_ap_dev *es2 = hd_to_es2(hd);
 531
 532         switch (cport_id) {
 533         case ES2_CPORT_CDSI1:
 534                 es2->cdsi1_in_use = false;
 535                 return;
 536         }
 537
 538         ida_simple_remove(&hd->cport_id_map, cport_id);
 539 }
 540
 541 static int cport_enable(struct gb_host_device *hd, u16 cport_id,
 542                         unsigned long flags)
 543 {
 544         struct es2_ap_dev *es2 = hd_to_es2(hd);
 545         struct usb_device *udev = es2->usb_dev;
 546         struct gb_apb_request_cport_flags *req;
 547         u32 connection_flags;
 548         int ret;
 549
 550         req = kzalloc(sizeof(*req), GFP_KERNEL);
 551         if (!req)
 552                 return -ENOMEM;
 553
 554         connection_flags = 0;
 555         if (flags & GB_CONNECTION_FLAG_CONTROL)
 556                 connection_flags |= GB_APB_CPORT_FLAG_CONTROL;
 557         if (flags & GB_CONNECTION_FLAG_HIGH_PRIO)
 558                 connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO;
 559
 560         req->flags = cpu_to_le32(connection_flags);
 561
 562         dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__,
 563                 cport_id, connection_flags);
 564
 565         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 566                               GB_APB_REQUEST_CPORT_FLAGS,
 567                               USB_DIR_OUT | USB_TYPE_VENDOR |
 568                               USB_RECIP_INTERFACE, cport_id, 0,
 569                               req, sizeof(*req), ES2_USB_CTRL_TIMEOUT);
 570         if (ret < 0) {
 571                 dev_err(&udev->dev, "failed to set cport flags for port %d\n",
 572                         cport_id);
 573                 goto out;
 574         }
 575
 576         ret = 0;
 577 out:
 578         kfree(req);
 579
 580         return ret;
 581 }
 582
 583 static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id)
 584 {
 585         struct es2_ap_dev *es2 = hd_to_es2(hd);
 586         struct device *dev = &es2->usb_dev->dev;
 587         struct arpc_cport_connected_req req;
 588         int ret;
 589
 590         req.cport_id = cpu_to_le16(cport_id);
 591         ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req),
 592                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 593         if (ret) {
 594                 dev_err(dev, "failed to set connected state for cport %u: %d\n",
 595                         cport_id, ret);
 596                 return ret;
 597         }
 598
 599         return 0;
 600 }
 601
 602 static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id)
 603 {
 604         struct es2_ap_dev *es2 = hd_to_es2(hd);
 605         struct device *dev = &es2->usb_dev->dev;
 606         struct arpc_cport_flush_req req;
 607         int ret;
 608
 609         req.cport_id = cpu_to_le16(cport_id);
 610         ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req),
 611                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 612         if (ret) {
 613                 dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret);
 614                 return ret;
 615         }
 616
 617         return 0;
 618 }
 619
 620 static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id,
 621                               u8 phase, unsigned int timeout)
 622 {
 623         struct es2_ap_dev *es2 = hd_to_es2(hd);
 624         struct device *dev = &es2->usb_dev->dev;
 625         struct arpc_cport_shutdown_req req;
 626         int result;
 627         int ret;
 628
 629         if (timeout > U16_MAX)
 630                 return -EINVAL;
 631
 632         req.cport_id = cpu_to_le16(cport_id);
 633         req.timeout = cpu_to_le16(timeout);
 634         req.phase = phase;
 635         ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req),
 636                         &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
 637         if (ret) {
 638                 dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n",
 639                         cport_id, ret, result);
 640                 return ret;
 641         }
 642
 643         return 0;
 644 }
 645
 646 static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id,
 647                              size_t peer_space, unsigned int timeout)
 648 {
 649         struct es2_ap_dev *es2 = hd_to_es2(hd);
 650         struct device *dev = &es2->usb_dev->dev;
 651         struct arpc_cport_quiesce_req req;
 652         int result;
 653         int ret;
 654
 655         if (peer_space > U16_MAX)
 656                 return -EINVAL;
 657
 658         if (timeout > U16_MAX)
 659                 return -EINVAL;
 660
 661         req.cport_id = cpu_to_le16(cport_id);
 662         req.peer_space = cpu_to_le16(peer_space);
 663         req.timeout = cpu_to_le16(timeout);
 664         ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req),
 665                         &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
 666         if (ret) {
 667                 dev_err(dev, "failed to quiesce cport %u: %d (%d)\n",
 668                         cport_id, ret, result);
 669                 return ret;
 670         }
 671
 672         return 0;
 673 }
 674
 675 static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id)
 676 {
 677         struct es2_ap_dev *es2 = hd_to_es2(hd);
 678         struct device *dev = &es2->usb_dev->dev;
 679         struct arpc_cport_clear_req req;
 680         int ret;
 681
 682         req.cport_id = cpu_to_le16(cport_id);
 683         ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req),
 684                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 685         if (ret) {
 686                 dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret);
 687                 return ret;
 688         }
 689
 690         return 0;
 691 }
 692
 693 static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id)
 694 {
 695         int retval;
 696         struct es2_ap_dev *es2 = hd_to_es2(hd);
 697         struct usb_device *udev = es2->usb_dev;
 698
 699         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 700                                  GB_APB_REQUEST_LATENCY_TAG_EN,
 701                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 702                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 703                                  0, ES2_USB_CTRL_TIMEOUT);
 704
 705         if (retval < 0)
 706                 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
 707                         cport_id);
 708         return retval;
 709 }
 710
 711 static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
 712 {
 713         int retval;
 714         struct es2_ap_dev *es2 = hd_to_es2(hd);
 715         struct usb_device *udev = es2->usb_dev;
 716
 717         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 718                                  GB_APB_REQUEST_LATENCY_TAG_DIS,
 719                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 720                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 721                                  0, ES2_USB_CTRL_TIMEOUT);
 722
 723         if (retval < 0)
 724                 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
 725                         cport_id);
 726         return retval;
 727 }
 728
 729 static struct gb_hd_driver es2_driver = {
 730         .hd_priv_size                   = sizeof(struct es2_ap_dev),
 731         .message_send                   = message_send,
 732         .message_cancel                 = message_cancel,
 733         .cport_allocate                 = es2_cport_allocate,
 734         .cport_release                  = es2_cport_release,
 735         .cport_enable                   = cport_enable,
 736         .cport_connected                = es2_cport_connected,
 737         .cport_flush                    = es2_cport_flush,
 738         .cport_shutdown                 = es2_cport_shutdown,
 739         .cport_quiesce                  = es2_cport_quiesce,
 740         .cport_clear                    = es2_cport_clear,
 741         .latency_tag_enable             = latency_tag_enable,
 742         .latency_tag_disable            = latency_tag_disable,
 743         .output                         = output,
 744 };
 745
 746 /* Common function to report consistent warnings based on URB status */
 747 static int check_urb_status(struct urb *urb)
 748 {
 749         struct device *dev = &urb->dev->dev;
 750         int status = urb->status;
 751
 752         switch (status) {
 753         case 0:
 754                 return 0;
 755
 756         case -EOVERFLOW:
 757                 dev_err(dev, "%s: overflow actual length is %d\n",
 758                         __func__, urb->actual_length);
 759                 fallthrough;
 760         case -ECONNRESET:
 761         case -ENOENT:
 762         case -ESHUTDOWN:
 763         case -EILSEQ:
 764         case -EPROTO:
 765                 /* device is gone, stop sending */
 766                 return status;
 767         }
 768         dev_err(dev, "%s: unknown status %d\n", __func__, status);
 769
 770         return -EAGAIN;
 771 }
 772
 773 static void es2_destroy(struct es2_ap_dev *es2)
 774 {
 775         struct usb_device *udev;
 776         struct urb *urb;
 777         int i;
 778
 779         debugfs_remove(es2->apb_log_enable_dentry);
 780         usb_log_disable(es2);
 781
 782         /* Tear down everything! */
 783         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 784                 urb = es2->cport_out_urb[i];
 785                 usb_kill_urb(urb);
 786                 usb_free_urb(urb);
 787                 es2->cport_out_urb[i] = NULL;
 788                 es2->cport_out_urb_busy[i] = false;     /* just to be anal */
 789         }
 790
 791         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 792                 usb_free_urb(es2->arpc_urb[i]);
 793                 kfree(es2->arpc_buffer[i]);
 794                 es2->arpc_buffer[i] = NULL;
 795         }
 796
 797         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 798                 usb_free_urb(es2->cport_in.urb[i]);
 799                 kfree(es2->cport_in.buffer[i]);
 800                 es2->cport_in.buffer[i] = NULL;
 801         }
 802
 803         /* release reserved CDSI0 and CDSI1 cports */
 804         gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1);
 805         gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0);
 806
 807         udev = es2->usb_dev;
 808         gb_hd_put(es2->hd);
 809
 810         usb_put_dev(udev);
 811 }
 812
 813 static void cport_in_callback(struct urb *urb)
 814 {
 815         struct gb_host_device *hd = urb->context;
 816         struct device *dev = &urb->dev->dev;
 817         struct gb_operation_msg_hdr *header;
 818         int status = check_urb_status(urb);
 819         int retval;
 820         u16 cport_id;
 821
 822         if (status) {
 823                 if ((status == -EAGAIN) || (status == -EPROTO))
 824                         goto exit;
 825
 826                 /* The urb is being unlinked */
 827                 if (status == -ENOENT || status == -ESHUTDOWN)
 828                         return;
 829
 830                 dev_err(dev, "urb cport in error %d (dropped)\n", status);
 831                 return;
 832         }
 833
 834         if (urb->actual_length < sizeof(*header)) {
 835                 dev_err(dev, "short message received\n");
 836                 goto exit;
 837         }
 838
 839         /* Extract the CPort id, which is packed in the message header */
 840         header = urb->transfer_buffer;
 841         cport_id = gb_message_cport_unpack(header);
 842
 843         if (cport_id_valid(hd, cport_id)) {
 844                 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
 845                                   urb->actual_length);
 846         } else {
 847                 dev_err(dev, "invalid cport id %u received\n", cport_id);
 848         }
 849 exit:
 850         /* put our urb back in the request pool */
 851         retval = usb_submit_urb(urb, GFP_ATOMIC);
 852         if (retval)
 853                 dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
 854 }
 855
 856 static void cport_out_callback(struct urb *urb)
 857 {
 858         struct gb_message *message = urb->context;
 859         struct gb_host_device *hd = message->operation->connection->hd;
 860         struct es2_ap_dev *es2 = hd_to_es2(hd);
 861         int status = check_urb_status(urb);
 862         unsigned long flags;
 863
 864         gb_message_cport_clear(message->header);
 865
 866         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 867         message->hcpriv = NULL;
 868         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 869
 870         /*
 871          * Tell the submitter that the message send (attempt) is
 872          * complete, and report the status.
 873          */
 874         greybus_message_sent(hd, message, status);
 875
 876         free_urb(es2, urb);
 877 }
 878
 879 static struct arpc *arpc_alloc(void *payload, u16 size, u8 type)
 880 {
 881         struct arpc *rpc;
 882
 883         if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX)
 884                 return NULL;
 885
 886         rpc = kzalloc(sizeof(*rpc), GFP_KERNEL);
 887         if (!rpc)
 888                 return NULL;
 889
 890         INIT_LIST_HEAD(&rpc->list);
 891         rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL);
 892         if (!rpc->req)
 893                 goto err_free_rpc;
 894
 895         rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL);
 896         if (!rpc->resp)
 897                 goto err_free_req;
 898
 899         rpc->req->type = type;
 900         rpc->req->size = cpu_to_le16(sizeof(*rpc->req) + size);
 901         memcpy(rpc->req->data, payload, size);
 902
 903         init_completion(&rpc->response_received);
 904
 905         return rpc;
 906
 907 err_free_req:
 908         kfree(rpc->req);
 909 err_free_rpc:
 910         kfree(rpc);
 911
 912         return NULL;
 913 }
 914
 915 static void arpc_free(struct arpc *rpc)
 916 {
 917         kfree(rpc->req);
 918         kfree(rpc->resp);
 919         kfree(rpc);
 920 }
 921
 922 static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id)
 923 {
 924         struct arpc *rpc;
 925
 926         list_for_each_entry(rpc, &es2->arpcs, list) {
 927                 if (rpc->req->id == id)
 928                         return rpc;
 929         }
 930
 931         return NULL;
 932 }
 933
 934 static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc)
 935 {
 936         rpc->active = true;
 937         rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++);
 938         list_add_tail(&rpc->list, &es2->arpcs);
 939 }
 940
 941 static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc)
 942 {
 943         if (rpc->active) {
 944                 rpc->active = false;
 945                 list_del(&rpc->list);
 946         }
 947 }
 948
 949 static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout)
 950 {
 951         struct usb_device *udev = es2->usb_dev;
 952         int retval;
 953
 954         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 955                                  GB_APB_REQUEST_ARPC_RUN,
 956                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 957                                  USB_RECIP_INTERFACE,
 958                                  0, 0,
 959                                  rpc->req, le16_to_cpu(rpc->req->size),
 960                                  ES2_USB_CTRL_TIMEOUT);
 961         if (retval < 0) {
 962                 dev_err(&udev->dev,
 963                         "failed to send ARPC request %d: %d\n",
 964                         rpc->req->type, retval);
 965                 return retval;
 966         }
 967
 968         return 0;
 969 }
 970
 971 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
 972                      size_t size, int *result, unsigned int timeout)
 973 {
 974         struct arpc *rpc;
 975         unsigned long flags;
 976         int retval;
 977
 978         if (result)
 979                 *result = 0;
 980
 981         rpc = arpc_alloc(payload, size, type);
 982         if (!rpc)
 983                 return -ENOMEM;
 984
 985         spin_lock_irqsave(&es2->arpc_lock, flags);
 986         arpc_add(es2, rpc);
 987         spin_unlock_irqrestore(&es2->arpc_lock, flags);
 988
 989         retval = arpc_send(es2, rpc, timeout);
 990         if (retval)
 991                 goto out_arpc_del;
 992
 993         retval = wait_for_completion_interruptible_timeout(
 994                                                 &rpc->response_received,
 995                                                 msecs_to_jiffies(timeout));
 996         if (retval <= 0) {
 997                 if (!retval)
 998                         retval = -ETIMEDOUT;
 999                 goto out_arpc_del;
1000         }
1001
1002         if (rpc->resp->result) {
1003                 retval = -EREMOTEIO;
1004                 if (result)
1005                         *result = rpc->resp->result;
1006         } else {
1007                 retval = 0;
1008         }
1009
1010 out_arpc_del:
1011         spin_lock_irqsave(&es2->arpc_lock, flags);
1012         arpc_del(es2, rpc);
1013         spin_unlock_irqrestore(&es2->arpc_lock, flags);
1014         arpc_free(rpc);
1015
1016         if (retval < 0 && retval != -EREMOTEIO) {
1017                 dev_err(&es2->usb_dev->dev,
1018                         "failed to execute ARPC: %d\n", retval);
1019         }
1020
1021         return retval;
1022 }
1023
1024 static void arpc_in_callback(struct urb *urb)
1025 {
1026         struct es2_ap_dev *es2 = urb->context;
1027         struct device *dev = &urb->dev->dev;
1028         int status = check_urb_status(urb);
1029         struct arpc *rpc;
1030         struct arpc_response_message *resp;
1031         unsigned long flags;
1032         int retval;
1033
1034         if (status) {
1035                 if ((status == -EAGAIN) || (status == -EPROTO))
1036                         goto exit;
1037
1038                 /* The urb is being unlinked */
1039                 if (status == -ENOENT || status == -ESHUTDOWN)
1040                         return;
1041
1042                 dev_err(dev, "arpc in-urb error %d (dropped)\n", status);
1043                 return;
1044         }
1045
1046         if (urb->actual_length < sizeof(*resp)) {
1047                 dev_err(dev, "short aprc response received\n");
1048                 goto exit;
1049         }
1050
1051         resp = urb->transfer_buffer;
1052         spin_lock_irqsave(&es2->arpc_lock, flags);
1053         rpc = arpc_find(es2, resp->id);
1054         if (!rpc) {
1055                 dev_err(dev, "invalid arpc response id received: %u\n",
1056                         le16_to_cpu(resp->id));
1057                 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1058                 goto exit;
1059         }
1060
1061         arpc_del(es2, rpc);
1062         memcpy(rpc->resp, resp, sizeof(*resp));
1063         complete(&rpc->response_received);
1064         spin_unlock_irqrestore(&es2->arpc_lock, flags);
1065
1066 exit:
1067         /* put our urb back in the request pool */
1068         retval = usb_submit_urb(urb, GFP_ATOMIC);
1069         if (retval)
1070                 dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval);
1071 }
1072
1073 #define APB1_LOG_MSG_SIZE       64
1074 static void apb_log_get(struct es2_ap_dev *es2, char *buf)
1075 {
1076         int retval;
1077
1078         do {
1079                 retval = usb_control_msg(es2->usb_dev,
1080                                          usb_rcvctrlpipe(es2->usb_dev, 0),
1081                                          GB_APB_REQUEST_LOG,
1082                                          USB_DIR_IN | USB_TYPE_VENDOR |
1083                                          USB_RECIP_INTERFACE,
1084                                          0x00, 0x00,
1085                                          buf,
1086                                          APB1_LOG_MSG_SIZE,
1087                                          ES2_USB_CTRL_TIMEOUT);
1088                 if (retval > 0)
1089                         kfifo_in(&es2->apb_log_fifo, buf, retval);
1090         } while (retval > 0);
1091 }
1092
1093 static int apb_log_poll(void *data)
1094 {
1095         struct es2_ap_dev *es2 = data;
1096         char *buf;
1097
1098         buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
1099         if (!buf)
1100                 return -ENOMEM;
1101
1102         while (!kthread_should_stop()) {
1103                 msleep(1000);
1104                 apb_log_get(es2, buf);
1105         }
1106
1107         kfree(buf);
1108
1109         return 0;
1110 }
1111
1112 static ssize_t apb_log_read(struct file *f, char __user *buf,
1113                             size_t count, loff_t *ppos)
1114 {
1115         struct es2_ap_dev *es2 = file_inode(f)->i_private;
1116         ssize_t ret;
1117         size_t copied;
1118         char *tmp_buf;
1119
1120         if (count > APB1_LOG_SIZE)
1121                 count = APB1_LOG_SIZE;
1122
1123         tmp_buf = kmalloc(count, GFP_KERNEL);
1124         if (!tmp_buf)
1125                 return -ENOMEM;
1126
1127         copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count);
1128         ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
1129
1130         kfree(tmp_buf);
1131
1132         return ret;
1133 }
1134
1135 static const struct file_operations apb_log_fops = {
1136         .read   = apb_log_read,
1137 };
1138
1139 static void usb_log_enable(struct es2_ap_dev *es2)
1140 {
1141         if (!IS_ERR_OR_NULL(es2->apb_log_task))
1142                 return;
1143
1144         /* get log from APB1 */
1145         es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log");
1146         if (IS_ERR(es2->apb_log_task))
1147                 return;
1148         /* XXX We will need to rename this per APB */
1149         es2->apb_log_dentry = debugfs_create_file("apb_log", 0444,
1150                                                   gb_debugfs_get(), es2,
1151                                                   &apb_log_fops);
1152 }
1153
1154 static void usb_log_disable(struct es2_ap_dev *es2)
1155 {
1156         if (IS_ERR_OR_NULL(es2->apb_log_task))
1157                 return;
1158
1159         debugfs_remove(es2->apb_log_dentry);
1160         es2->apb_log_dentry = NULL;
1161
1162         kthread_stop(es2->apb_log_task);
1163         es2->apb_log_task = NULL;
1164 }
1165
1166 static ssize_t apb_log_enable_read(struct file *f, char __user *buf,
1167                                    size_t count, loff_t *ppos)
1168 {
1169         struct es2_ap_dev *es2 = file_inode(f)->i_private;
1170         int enable = !IS_ERR_OR_NULL(es2->apb_log_task);
1171         char tmp_buf[3];
1172
1173         sprintf(tmp_buf, "%d\n", enable);
1174         return simple_read_from_buffer(buf, count, ppos, tmp_buf, 2);
1175 }
1176
1177 static ssize_t apb_log_enable_write(struct file *f, const char __user *buf,
1178                                     size_t count, loff_t *ppos)
1179 {
1180         int enable;
1181         ssize_t retval;
1182         struct es2_ap_dev *es2 = file_inode(f)->i_private;
1183
1184         retval = kstrtoint_from_user(buf, count, 10, &enable);
1185         if (retval)
1186                 return retval;
1187
1188         if (enable)
1189                 usb_log_enable(es2);
1190         else
1191                 usb_log_disable(es2);
1192
1193         return count;
1194 }
1195
1196 static const struct file_operations apb_log_enable_fops = {
1197         .read   = apb_log_enable_read,
1198         .write  = apb_log_enable_write,
1199 };
1200
1201 static int apb_get_cport_count(struct usb_device *udev)
1202 {
1203         int retval;
1204         __le16 *cport_count;
1205
1206         cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL);
1207         if (!cport_count)
1208                 return -ENOMEM;
1209
1210         retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
1211                                  GB_APB_REQUEST_CPORT_COUNT,
1212                                  USB_DIR_IN | USB_TYPE_VENDOR |
1213                                  USB_RECIP_INTERFACE, 0, 0, cport_count,
1214                                  sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT);
1215         if (retval != sizeof(*cport_count)) {
1216                 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1217                         retval);
1218
1219                 if (retval >= 0)
1220                         retval = -EIO;
1221
1222                 goto out;
1223         }
1224
1225         retval = le16_to_cpu(*cport_count);
1226
1227         /* We need to fit a CPort ID in one byte of a message header */
1228         if (retval > U8_MAX) {
1229                 retval = U8_MAX;
1230                 dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n");
1231         }
1232
1233 out:
1234         kfree(cport_count);
1235         return retval;
1236 }
1237
1238 /*
1239  * The ES2 USB Bridge device has 15 endpoints
1240  * 1 Control - usual USB stuff + AP -> APBridgeA messages
1241  * 7 Bulk IN - CPort data in
1242  * 7 Bulk OUT - CPort data out
1243  */
1244 static int ap_probe(struct usb_interface *interface,
1245                     const struct usb_device_id *id)
1246 {
1247         struct es2_ap_dev *es2;
1248         struct gb_host_device *hd;
1249         struct usb_device *udev;
1250         struct usb_host_interface *iface_desc;
1251         struct usb_endpoint_descriptor *endpoint;
1252         __u8 ep_addr;
1253         int retval;
1254         int i;
1255         int num_cports;
1256         bool bulk_out_found = false;
1257         bool bulk_in_found = false;
1258         bool arpc_in_found = false;
1259
1260         udev = usb_get_dev(interface_to_usbdev(interface));
1261
1262         num_cports = apb_get_cport_count(udev);
1263         if (num_cports < 0) {
1264                 usb_put_dev(udev);
1265                 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1266                         num_cports);
1267                 return num_cports;
1268         }
1269
1270         hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX,
1271                           num_cports);
1272         if (IS_ERR(hd)) {
1273                 usb_put_dev(udev);
1274                 return PTR_ERR(hd);
1275         }
1276
1277         es2 = hd_to_es2(hd);
1278         es2->hd = hd;
1279         es2->usb_intf = interface;
1280         es2->usb_dev = udev;
1281         spin_lock_init(&es2->cport_out_urb_lock);
1282         INIT_KFIFO(es2->apb_log_fifo);
1283         usb_set_intfdata(interface, es2);
1284
1285         /*
1286          * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated
1287          * dynamically.
1288          */
1289         retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0);
1290         if (retval)
1291                 goto error;
1292         retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1);
1293         if (retval)
1294                 goto error;
1295
1296         /* find all bulk endpoints */
1297         iface_desc = interface->cur_altsetting;
1298         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1299                 endpoint = &iface_desc->endpoint[i].desc;
1300                 ep_addr = endpoint->bEndpointAddress;
1301
1302                 if (usb_endpoint_is_bulk_in(endpoint)) {
1303                         if (!bulk_in_found) {
1304                                 es2->cport_in.endpoint = ep_addr;
1305                                 bulk_in_found = true;
1306                         } else if (!arpc_in_found) {
1307                                 es2->arpc_endpoint_in = ep_addr;
1308                                 arpc_in_found = true;
1309                         } else {
1310                                 dev_warn(&udev->dev,
1311                                          "Unused bulk IN endpoint found: 0x%02x\n",
1312                                          ep_addr);
1313                         }
1314                         continue;
1315                 }
1316                 if (usb_endpoint_is_bulk_out(endpoint)) {
1317                         if (!bulk_out_found) {
1318                                 es2->cport_out_endpoint = ep_addr;
1319                                 bulk_out_found = true;
1320                         } else {
1321                                 dev_warn(&udev->dev,
1322                                          "Unused bulk OUT endpoint found: 0x%02x\n",
1323                                          ep_addr);
1324                         }
1325                         continue;
1326                 }
1327                 dev_warn(&udev->dev,
1328                          "Unknown endpoint type found, address 0x%02x\n",
1329                          ep_addr);
1330         }
1331         if (!bulk_in_found || !arpc_in_found || !bulk_out_found) {
1332                 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
1333                 retval = -ENODEV;
1334                 goto error;
1335         }
1336
1337         /* Allocate buffers for our cport in messages */
1338         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
1339                 struct urb *urb;
1340                 u8 *buffer;
1341
1342                 urb = usb_alloc_urb(0, GFP_KERNEL);
1343                 if (!urb) {
1344                         retval = -ENOMEM;
1345                         goto error;
1346                 }
1347                 es2->cport_in.urb[i] = urb;
1348
1349                 buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
1350                 if (!buffer) {
1351                         retval = -ENOMEM;
1352                         goto error;
1353                 }
1354
1355                 usb_fill_bulk_urb(urb, udev,
1356                                   usb_rcvbulkpipe(udev, es2->cport_in.endpoint),
1357                                   buffer, ES2_GBUF_MSG_SIZE_MAX,
1358                                   cport_in_callback, hd);
1359
1360                 es2->cport_in.buffer[i] = buffer;
1361         }
1362
1363         /* Allocate buffers for ARPC in messages */
1364         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
1365                 struct urb *urb;
1366                 u8 *buffer;
1367
1368                 urb = usb_alloc_urb(0, GFP_KERNEL);
1369                 if (!urb) {
1370                         retval = -ENOMEM;
1371                         goto error;
1372                 }
1373                 es2->arpc_urb[i] = urb;
1374
1375                 buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL);
1376                 if (!buffer) {
1377                         retval = -ENOMEM;
1378                         goto error;
1379                 }
1380
1381                 usb_fill_bulk_urb(urb, udev,
1382                                   usb_rcvbulkpipe(udev,
1383                                                   es2->arpc_endpoint_in),
1384                                   buffer, ARPC_IN_SIZE_MAX,
1385                                   arpc_in_callback, es2);
1386
1387                 es2->arpc_buffer[i] = buffer;
1388         }
1389
1390         /* Allocate urbs for our CPort OUT messages */
1391         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
1392                 struct urb *urb;
1393
1394                 urb = usb_alloc_urb(0, GFP_KERNEL);
1395                 if (!urb) {
1396                         retval = -ENOMEM;
1397                         goto error;
1398                 }
1399
1400                 es2->cport_out_urb[i] = urb;
1401                 es2->cport_out_urb_busy[i] = false;     /* just to be anal */
1402         }
1403
1404         /* XXX We will need to rename this per APB */
1405         es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable",
1406                                                          0644,
1407                                                          gb_debugfs_get(), es2,
1408                                                          &apb_log_enable_fops);
1409
1410         INIT_LIST_HEAD(&es2->arpcs);
1411         spin_lock_init(&es2->arpc_lock);
1412
1413         retval = es2_arpc_in_enable(es2);
1414         if (retval)
1415                 goto error;
1416
1417         retval = gb_hd_add(hd);
1418         if (retval)
1419                 goto err_disable_arpc_in;
1420
1421         retval = es2_cport_in_enable(es2, &es2->cport_in);
1422         if (retval)
1423                 goto err_hd_del;
1424
1425         return 0;
1426
1427 err_hd_del:
1428         gb_hd_del(hd);
1429 err_disable_arpc_in:
1430         es2_arpc_in_disable(es2);
1431 error:
1432         es2_destroy(es2);
1433
1434         return retval;
1435 }
1436
1437 static void ap_disconnect(struct usb_interface *interface)
1438 {
1439         struct es2_ap_dev *es2 = usb_get_intfdata(interface);
1440
1441         gb_hd_del(es2->hd);
1442
1443         es2_cport_in_disable(es2, &es2->cport_in);
1444         es2_arpc_in_disable(es2);
1445
1446         es2_destroy(es2);
1447 }
1448
1449 static struct usb_driver es2_ap_driver = {
1450         .name =         "es2_ap_driver",
1451         .probe =        ap_probe,
1452         .disconnect =   ap_disconnect,
1453         .id_table =     id_table,
1454         .soft_unbind =  1,
1455 };
1456
1457 module_usb_driver(es2_ap_driver);
1458
1459 MODULE_LICENSE("GPL v2");
1460 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");