drivers/staging/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 <asm/unaligned.h>
  15
  16 #include "arpc.h"
  17 #include "greybus.h"
  18 #include "greybus_trace.h"
  19 #include "connection.h"
  20
  21
  22 /* Default timeout for USB vendor requests. */
  23 #define ES2_USB_CTRL_TIMEOUT    500
  24
  25 /* Default timeout for ARPC CPort requests */
  26 #define ES2_ARPC_CPORT_TIMEOUT  500
  27
  28 /* Fixed CPort numbers */
  29 #define ES2_CPORT_CDSI0         16
  30 #define ES2_CPORT_CDSI1         17
  31
  32 /* Memory sizes for the buffers sent to/from the ES2 controller */
  33 #define ES2_GBUF_MSG_SIZE_MAX   2048
  34
  35 /* Memory sizes for the ARPC buffers */
  36 #define ARPC_OUT_SIZE_MAX       U16_MAX
  37 #define ARPC_IN_SIZE_MAX        128
  38
  39 static const struct usb_device_id id_table[] = {
  40         { USB_DEVICE(0x18d1, 0x1eaf) },
  41         { },
  42 };
  43 MODULE_DEVICE_TABLE(usb, id_table);
  44
  45 #define APB1_LOG_SIZE           SZ_16K
  46
  47 /*
  48  * Number of CPort IN urbs in flight at any point in time.
  49  * Adjust if we are having stalls in the USB buffer due to not enough urbs in
  50  * flight.
  51  */
  52 #define NUM_CPORT_IN_URB        4
  53
  54 /* Number of CPort OUT urbs in flight at any point in time.
  55  * Adjust if we get messages saying we are out of urbs in the system log.
  56  */
  57 #define NUM_CPORT_OUT_URB       8
  58
  59 /*
  60  * Number of ARPC in urbs in flight at any point in time.
  61  */
  62 #define NUM_ARPC_IN_URB         2
  63
  64 /*
  65  * @endpoint: bulk in endpoint for CPort data
  66  * @urb: array of urbs for the CPort in messages
  67  * @buffer: array of buffers for the @cport_in_urb urbs
  68  */
  69 struct es2_cport_in {
  70         __u8 endpoint;
  71         struct urb *urb[NUM_CPORT_IN_URB];
  72         u8 *buffer[NUM_CPORT_IN_URB];
  73 };
  74
  75 /**
  76  * es2_ap_dev - ES2 USB Bridge to AP structure
  77  * @usb_dev: pointer to the USB device we are.
  78  * @usb_intf: pointer to the USB interface we are bound to.
  79  * @hd: pointer to our gb_host_device structure
  80
  81  * @cport_in: endpoint, urbs and buffer for cport in messages
  82  * @cport_out_endpoint: endpoint for for cport out messages
  83  * @cport_out_urb: array of urbs for the CPort out messages
  84  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
  85  *                      not.
  86  * @cport_out_urb_cancelled: array of flags indicating whether the
  87  *                      corresponding @cport_out_urb is being cancelled
  88  * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
  89  *
  90  * @apb_log_task: task pointer for logging thread
  91  * @apb_log_dentry: file system entry for the log file interface
  92  * @apb_log_enable_dentry: file system entry for enabling logging
  93  * @apb_log_fifo: kernel FIFO to carry logged data
  94  * @arpc_urb: array of urbs for the ARPC in messages
  95  * @arpc_buffer: array of buffers for the @arpc_urb urbs
  96  * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC
  97  * @arpc_id_cycle: gives an unique id to ARPC
  98  * @arpc_lock: locks ARPC list
  99  * @arpcs: list of in progress ARPCs
 100  */
 101 struct es2_ap_dev {
 102         struct usb_device *usb_dev;
 103         struct usb_interface *usb_intf;
 104         struct gb_host_device *hd;
 105
 106         struct es2_cport_in cport_in;
 107         __u8 cport_out_endpoint;
 108         struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
 109         bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
 110         bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
 111         spinlock_t cport_out_urb_lock;
 112
 113         bool cdsi1_in_use;
 114
 115         struct task_struct *apb_log_task;
 116         struct dentry *apb_log_dentry;
 117         struct dentry *apb_log_enable_dentry;
 118         DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);
 119
 120         __u8 arpc_endpoint_in;
 121         struct urb *arpc_urb[NUM_ARPC_IN_URB];
 122         u8 *arpc_buffer[NUM_ARPC_IN_URB];
 123
 124         int arpc_id_cycle;
 125         spinlock_t arpc_lock;
 126         struct list_head arpcs;
 127 };
 128
 129 struct arpc {
 130         struct list_head list;
 131         struct arpc_request_message *req;
 132         struct arpc_response_message *resp;
 133         struct completion response_received;
 134         bool active;
 135 };
 136
 137 static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
 138 {
 139         return (struct es2_ap_dev *)&hd->hd_priv;
 140 }
 141
 142 static void cport_out_callback(struct urb *urb);
 143 static void usb_log_enable(struct es2_ap_dev *es2);
 144 static void usb_log_disable(struct es2_ap_dev *es2);
 145 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
 146                      size_t size, int *result, unsigned int timeout);
 147
 148 static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 149 {
 150         struct usb_device *udev = es2->usb_dev;
 151         u8 *data;
 152         int retval;
 153
 154         data = kmemdup(req, size, GFP_KERNEL);
 155         if (!data)
 156                 return -ENOMEM;
 157
 158         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 159                                  cmd,
 160                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 161                                  USB_RECIP_INTERFACE,
 162                                  0, 0, data, size, ES2_USB_CTRL_TIMEOUT);
 163         if (retval < 0)
 164                 dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
 165         else
 166                 retval = 0;
 167
 168         kfree(data);
 169         return retval;
 170 }
 171
 172 static void ap_urb_complete(struct urb *urb)
 173 {
 174         struct usb_ctrlrequest *dr = urb->context;
 175
 176         kfree(dr);
 177         usb_free_urb(urb);
 178 }
 179
 180 static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 181 {
 182         struct usb_device *udev = es2->usb_dev;
 183         struct urb *urb;
 184         struct usb_ctrlrequest *dr;
 185         u8 *buf;
 186         int retval;
 187
 188         urb = usb_alloc_urb(0, GFP_ATOMIC);
 189         if (!urb)
 190                 return -ENOMEM;
 191
 192         dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
 193         if (!dr) {
 194                 usb_free_urb(urb);
 195                 return -ENOMEM;
 196         }
 197
 198         buf = (u8 *)dr + sizeof(*dr);
 199         memcpy(buf, req, size);
 200
 201         dr->bRequest = cmd;
 202         dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
 203         dr->wValue = 0;
 204         dr->wIndex = 0;
 205         dr->wLength = cpu_to_le16(size);
 206
 207         usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
 208                              (unsigned char *)dr, buf, size,
 209                              ap_urb_complete, dr);
 210         retval = usb_submit_urb(urb, GFP_ATOMIC);
 211         if (retval) {
 212                 usb_free_urb(urb);
 213                 kfree(dr);
 214         }
 215         return retval;
 216 }
 217
 218 static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
 219                      bool async)
 220 {
 221         struct es2_ap_dev *es2 = hd_to_es2(hd);
 222
 223         if (async)
 224                 return output_async(es2, req, size, cmd);
 225
 226         return output_sync(es2, req, size, cmd);
 227 }
 228
 229 static int es2_cport_in_enable(struct es2_ap_dev *es2,
 230                                 struct es2_cport_in *cport_in)
 231 {
 232         struct urb *urb;
 233         int ret;
 234         int i;
 235
 236         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 237                 urb = cport_in->urb[i];
 238
 239                 ret = usb_submit_urb(urb, GFP_KERNEL);
 240                 if (ret) {
 241                         dev_err(&es2->usb_dev->dev,
 242                                         "failed to submit in-urb: %d\n", ret);
 243                         goto err_kill_urbs;
 244                 }
 245         }
 246
 247         return 0;
 248
 249 err_kill_urbs:
 250         for (--i; i >= 0; --i) {
 251                 urb = cport_in->urb[i];
 252                 usb_kill_urb(urb);
 253         }
 254
 255         return ret;
 256 }
 257
 258 static void es2_cport_in_disable(struct es2_ap_dev *es2,
 259                                 struct es2_cport_in *cport_in)
 260 {
 261         struct urb *urb;
 262         int i;
 263
 264         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 265                 urb = cport_in->urb[i];
 266                 usb_kill_urb(urb);
 267         }
 268 }
 269
 270 static int es2_arpc_in_enable(struct es2_ap_dev *es2)
 271 {
 272         struct urb *urb;
 273         int ret;
 274         int i;
 275
 276         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 277                 urb = es2->arpc_urb[i];
 278
 279                 ret = usb_submit_urb(urb, GFP_KERNEL);
 280                 if (ret) {
 281                         dev_err(&es2->usb_dev->dev,
 282                                 "failed to submit arpc in-urb: %d\n", ret);
 283                         goto err_kill_urbs;
 284                 }
 285         }
 286
 287         return 0;
 288
 289 err_kill_urbs:
 290         for (--i; i >= 0; --i) {
 291                 urb = es2->arpc_urb[i];
 292                 usb_kill_urb(urb);
 293         }
 294
 295         return ret;
 296 }
 297
 298 static void es2_arpc_in_disable(struct es2_ap_dev *es2)
 299 {
 300         struct urb *urb;
 301         int i;
 302
 303         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 304                 urb = es2->arpc_urb[i];
 305                 usb_kill_urb(urb);
 306         }
 307 }
 308
 309 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
 310 {
 311         struct urb *urb = NULL;
 312         unsigned long flags;
 313         int i;
 314
 315         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 316
 317         /* Look in our pool of allocated urbs first, as that's the "fastest" */
 318         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 319                 if (es2->cport_out_urb_busy[i] == false &&
 320                                 es2->cport_out_urb_cancelled[i] == false) {
 321                         es2->cport_out_urb_busy[i] = true;
 322                         urb = es2->cport_out_urb[i];
 323                         break;
 324                 }
 325         }
 326         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 327         if (urb)
 328                 return urb;
 329
 330         /*
 331          * Crap, pool is empty, complain to the syslog and go allocate one
 332          * dynamically as we have to succeed.
 333          */
 334         dev_dbg(&es2->usb_dev->dev,
 335                 "No free CPort OUT urbs, having to dynamically allocate one!\n");
 336         return usb_alloc_urb(0, gfp_mask);
 337 }
 338
 339 static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
 340 {
 341         unsigned long flags;
 342         int i;
 343         /*
 344          * See if this was an urb in our pool, if so mark it "free", otherwise
 345          * we need to free it ourselves.
 346          */
 347         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 348         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 349                 if (urb == es2->cport_out_urb[i]) {
 350                         es2->cport_out_urb_busy[i] = false;
 351                         urb = NULL;
 352                         break;
 353                 }
 354         }
 355         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 356
 357         /* If urb is not NULL, then we need to free this urb */
 358         usb_free_urb(urb);
 359 }
 360
 361 /*
 362  * We (ab)use the operation-message header pad bytes to transfer the
 363  * cport id in order to minimise overhead.
 364  */
 365 static void
 366 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
 367 {
 368         header->pad[0] = cport_id;
 369 }
 370
 371 /* Clear the pad bytes used for the CPort id */
 372 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
 373 {
 374         header->pad[0] = 0;
 375 }
 376
 377 /* Extract the CPort id packed into the header, and clear it */
 378 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
 379 {
 380         u16 cport_id = header->pad[0];
 381
 382         gb_message_cport_clear(header);
 383
 384         return cport_id;
 385 }
 386
 387 /*
 388  * Returns zero if the message was successfully queued, or a negative errno
 389  * otherwise.
 390  */
 391 static int message_send(struct gb_host_device *hd, u16 cport_id,
 392                         struct gb_message *message, gfp_t gfp_mask)
 393 {
 394         struct es2_ap_dev *es2 = hd_to_es2(hd);
 395         struct usb_device *udev = es2->usb_dev;
 396         size_t buffer_size;
 397         int retval;
 398         struct urb *urb;
 399         unsigned long flags;
 400
 401         /*
 402          * The data actually transferred will include an indication
 403          * of where the data should be sent.  Do one last check of
 404          * the target CPort id before filling it in.
 405          */
 406         if (!cport_id_valid(hd, cport_id)) {
 407                 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
 408                 return -EINVAL;
 409         }
 410
 411         /* Find a free urb */
 412         urb = next_free_urb(es2, gfp_mask);
 413         if (!urb)
 414                 return -ENOMEM;
 415
 416         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 417         message->hcpriv = urb;
 418         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 419
 420         /* Pack the cport id into the message header */
 421         gb_message_cport_pack(message->header, cport_id);
 422
 423         buffer_size = sizeof(*message->header) + message->payload_size;
 424
 425         usb_fill_bulk_urb(urb, udev,
 426                           usb_sndbulkpipe(udev,
 427                                           es2->cport_out_endpoint),
 428                           message->buffer, buffer_size,
 429                           cport_out_callback, message);
 430         urb->transfer_flags |= URB_ZERO_PACKET;
 431
 432         trace_gb_message_submit(message);
 433
 434         retval = usb_submit_urb(urb, gfp_mask);
 435         if (retval) {
 436                 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
 437
 438                 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 439                 message->hcpriv = NULL;
 440                 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 441
 442                 free_urb(es2, urb);
 443                 gb_message_cport_clear(message->header);
 444
 445                 return retval;
 446         }
 447
 448         return 0;
 449 }
 450
 451 /*
 452  * Can not be called in atomic context.
 453  */
 454 static void message_cancel(struct gb_message *message)
 455 {
 456         struct gb_host_device *hd = message->operation->connection->hd;
 457         struct es2_ap_dev *es2 = hd_to_es2(hd);
 458         struct urb *urb;
 459         int i;
 460
 461         might_sleep();
 462
 463         spin_lock_irq(&es2->cport_out_urb_lock);
 464         urb = message->hcpriv;
 465
 466         /* Prevent dynamically allocated urb from being deallocated. */
 467         usb_get_urb(urb);
 468
 469         /* Prevent pre-allocated urb from being reused. */
 470         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 471                 if (urb == es2->cport_out_urb[i]) {
 472                         es2->cport_out_urb_cancelled[i] = true;
 473                         break;
 474                 }
 475         }
 476         spin_unlock_irq(&es2->cport_out_urb_lock);
 477
 478         usb_kill_urb(urb);
 479
 480         if (i < NUM_CPORT_OUT_URB) {
 481                 spin_lock_irq(&es2->cport_out_urb_lock);
 482                 es2->cport_out_urb_cancelled[i] = false;
 483                 spin_unlock_irq(&es2->cport_out_urb_lock);
 484         }
 485
 486         usb_free_urb(urb);
 487 }
 488
 489 static int es2_cport_allocate(struct gb_host_device *hd, int cport_id,
 490                                 unsigned long flags)
 491 {
 492         struct es2_ap_dev *es2 = hd_to_es2(hd);
 493         struct ida *id_map = &hd->cport_id_map;
 494         int ida_start, ida_end;
 495
 496         switch (cport_id) {
 497         case ES2_CPORT_CDSI0:
 498         case ES2_CPORT_CDSI1:
 499                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 500                 return -EBUSY;
 501         }
 502
 503         if (flags & GB_CONNECTION_FLAG_OFFLOADED &&
 504                         flags & GB_CONNECTION_FLAG_CDSI1) {
 505                 if (es2->cdsi1_in_use) {
 506                         dev_err(&hd->dev, "CDSI1 already in use\n");
 507                         return -EBUSY;
 508                 }
 509
 510                 es2->cdsi1_in_use = true;
 511
 512                 return ES2_CPORT_CDSI1;
 513         }
 514
 515         if (cport_id < 0) {
 516                 ida_start = 0;
 517                 ida_end = hd->num_cports;
 518         } else if (cport_id < hd->num_cports) {
 519                 ida_start = cport_id;
 520                 ida_end = cport_id + 1;
 521         } else {
 522                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 523                 return -EINVAL;
 524         }
 525
 526         return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
 527 }
 528
 529 static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
 530 {
 531         struct es2_ap_dev *es2 = hd_to_es2(hd);
 532
 533         switch (cport_id) {
 534         case ES2_CPORT_CDSI1:
 535                 es2->cdsi1_in_use = false;
 536                 return;
 537         }
 538
 539         ida_simple_remove(&hd->cport_id_map, cport_id);
 540 }
 541
 542 static int cport_enable(struct gb_host_device *hd, u16 cport_id,
 543                         unsigned long flags)
 544 {
 545         struct es2_ap_dev *es2 = hd_to_es2(hd);
 546         struct usb_device *udev = es2->usb_dev;
 547         struct gb_apb_request_cport_flags *req;
 548         u32 connection_flags;
 549         int ret;
 550
 551         req = kzalloc(sizeof(*req), GFP_KERNEL);
 552         if (!req)
 553                 return -ENOMEM;
 554
 555         connection_flags = 0;
 556         if (flags & GB_CONNECTION_FLAG_CONTROL)
 557                 connection_flags |= GB_APB_CPORT_FLAG_CONTROL;
 558         if (flags & GB_CONNECTION_FLAG_HIGH_PRIO)
 559                 connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO;
 560
 561         req->flags = cpu_to_le32(connection_flags);
 562
 563         dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__,
 564                         cport_id, connection_flags);
 565
 566         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 567                                 GB_APB_REQUEST_CPORT_FLAGS,
 568                                 USB_DIR_OUT | USB_TYPE_VENDOR |
 569                                 USB_RECIP_INTERFACE, cport_id, 0,
 570                                 req, sizeof(*req), ES2_USB_CTRL_TIMEOUT);
 571         if (ret != sizeof(*req)) {
 572                 dev_err(&udev->dev, "failed to set cport flags for port %d\n",
 573                                 cport_id);
 574                 if (ret >= 0)
 575                         ret = -EIO;
 576
 577                 goto out;
 578         }
 579
 580         ret = 0;
 581 out:
 582         kfree(req);
 583
 584         return ret;
 585 }
 586
 587 static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id)
 588 {
 589         struct es2_ap_dev *es2 = hd_to_es2(hd);
 590         struct device *dev = &es2->usb_dev->dev;
 591         struct arpc_cport_connected_req req;
 592         int ret;
 593
 594         req.cport_id = cpu_to_le16(cport_id);
 595         ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req),
 596                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 597         if (ret) {
 598                 dev_err(dev, "failed to set connected state for cport %u: %d\n",
 599                                 cport_id, ret);
 600                 return ret;
 601         }
 602
 603         return 0;
 604 }
 605
 606 static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id)
 607 {
 608         struct es2_ap_dev *es2 = hd_to_es2(hd);
 609         struct device *dev = &es2->usb_dev->dev;
 610         struct arpc_cport_flush_req req;
 611         int ret;
 612
 613         req.cport_id = cpu_to_le16(cport_id);
 614         ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req),
 615                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 616         if (ret) {
 617                 dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret);
 618                 return ret;
 619         }
 620
 621         return 0;
 622 }
 623
 624 static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id,
 625                                 u8 phase, unsigned int timeout)
 626 {
 627         struct es2_ap_dev *es2 = hd_to_es2(hd);
 628         struct device *dev = &es2->usb_dev->dev;
 629         struct arpc_cport_shutdown_req req;
 630         int result;
 631         int ret;
 632
 633         if (timeout > U16_MAX)
 634                 return -EINVAL;
 635
 636         req.cport_id = cpu_to_le16(cport_id);
 637         req.timeout = cpu_to_le16(timeout);
 638         req.phase = phase;
 639         ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req),
 640                         &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
 641         if (ret) {
 642                 dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n",
 643                                 cport_id, ret, result);
 644                 return ret;
 645         }
 646
 647         return 0;
 648 }
 649
 650 static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id,
 651                                 size_t peer_space, unsigned int timeout)
 652 {
 653         struct es2_ap_dev *es2 = hd_to_es2(hd);
 654         struct device *dev = &es2->usb_dev->dev;
 655         struct arpc_cport_quiesce_req req;
 656         int result;
 657         int ret;
 658
 659         if (peer_space > U16_MAX)
 660                 return -EINVAL;
 661
 662         if (timeout > U16_MAX)
 663                 return -EINVAL;
 664
 665         req.cport_id = cpu_to_le16(cport_id);
 666         req.peer_space = cpu_to_le16(peer_space);
 667         req.timeout = cpu_to_le16(timeout);
 668         ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req),
 669                         &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
 670         if (ret) {
 671                 dev_err(dev, "failed to quiesce cport %u: %d (%d)\n",
 672                                 cport_id, ret, result);
 673                 return ret;
 674         }
 675
 676         return 0;
 677 }
 678
 679 static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id)
 680 {
 681         struct es2_ap_dev *es2 = hd_to_es2(hd);
 682         struct device *dev = &es2->usb_dev->dev;
 683         struct arpc_cport_clear_req req;
 684         int ret;
 685
 686         req.cport_id = cpu_to_le16(cport_id);
 687         ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req),
 688                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 689         if (ret) {
 690                 dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret);
 691                 return ret;
 692         }
 693
 694         return 0;
 695 }
 696
 697 static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id)
 698 {
 699         int retval;
 700         struct es2_ap_dev *es2 = hd_to_es2(hd);
 701         struct usb_device *udev = es2->usb_dev;
 702
 703         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 704                                  GB_APB_REQUEST_LATENCY_TAG_EN,
 705                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 706                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 707                                  0, ES2_USB_CTRL_TIMEOUT);
 708
 709         if (retval < 0)
 710                 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
 711                         cport_id);
 712         return retval;
 713 }
 714
 715 static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
 716 {
 717         int retval;
 718         struct es2_ap_dev *es2 = hd_to_es2(hd);
 719         struct usb_device *udev = es2->usb_dev;
 720
 721         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 722                                  GB_APB_REQUEST_LATENCY_TAG_DIS,
 723                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 724                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 725                                  0, ES2_USB_CTRL_TIMEOUT);
 726
 727         if (retval < 0)
 728                 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
 729                         cport_id);
 730         return retval;
 731 }
 732
 733 static struct gb_hd_driver es2_driver = {
 734         .hd_priv_size                   = sizeof(struct es2_ap_dev),
 735         .message_send                   = message_send,
 736         .message_cancel                 = message_cancel,
 737         .cport_allocate                 = es2_cport_allocate,
 738         .cport_release                  = es2_cport_release,
 739         .cport_enable                   = cport_enable,
 740         .cport_connected                = es2_cport_connected,
 741         .cport_flush                    = es2_cport_flush,
 742         .cport_shutdown                 = es2_cport_shutdown,
 743         .cport_quiesce                  = es2_cport_quiesce,
 744         .cport_clear                    = es2_cport_clear,
 745         .latency_tag_enable             = latency_tag_enable,
 746         .latency_tag_disable            = latency_tag_disable,
 747         .output                         = output,
 748 };
 749
 750 /* Common function to report consistent warnings based on URB status */
 751 static int check_urb_status(struct urb *urb)
 752 {
 753         struct device *dev = &urb->dev->dev;
 754         int status = urb->status;
 755
 756         switch (status) {
 757         case 0:
 758                 return 0;
 759
 760         case -EOVERFLOW:
 761                 dev_err(dev, "%s: overflow actual length is %d\n",
 762                         __func__, urb->actual_length);
 763                 /* fall through */
 764         case -ECONNRESET:
 765         case -ENOENT:
 766         case -ESHUTDOWN:
 767         case -EILSEQ:
 768         case -EPROTO:
 769                 /* device is gone, stop sending */
 770                 return status;
 771         }
 772         dev_err(dev, "%s: unknown status %d\n", __func__, status);
 773
 774         return -EAGAIN;
 775 }
 776
 777 static void es2_destroy(struct es2_ap_dev *es2)
 778 {
 779         struct usb_device *udev;
 780         struct urb *urb;
 781         int i;
 782
 783         debugfs_remove(es2->apb_log_enable_dentry);
 784         usb_log_disable(es2);
 785
 786         /* Tear down everything! */
 787         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 788                 urb = es2->cport_out_urb[i];
 789                 usb_kill_urb(urb);
 790                 usb_free_urb(urb);
 791                 es2->cport_out_urb[i] = NULL;
 792                 es2->cport_out_urb_busy[i] = false;     /* just to be anal */
 793         }
 794
 795         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 796                 usb_free_urb(es2->arpc_urb[i]);
 797                 kfree(es2->arpc_buffer[i]);
 798                 es2->arpc_buffer[i] = NULL;
 799         }
 800
 801         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 802                 usb_free_urb(es2->cport_in.urb[i]);
 803                 kfree(es2->cport_in.buffer[i]);
 804                 es2->cport_in.buffer[i] = NULL;
 805         }
 806
 807         /* release reserved CDSI0 and CDSI1 cports */
 808         gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1);
 809         gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0);
 810
 811         udev = es2->usb_dev;
 812         gb_hd_put(es2->hd);
 813
 814         usb_put_dev(udev);
 815 }
 816
 817 static void cport_in_callback(struct urb *urb)
 818 {
 819         struct gb_host_device *hd = urb->context;
 820         struct device *dev = &urb->dev->dev;
 821         struct gb_operation_msg_hdr *header;
 822         int status = check_urb_status(urb);
 823         int retval;
 824         u16 cport_id;
 825
 826         if (status) {
 827                 if ((status == -EAGAIN) || (status == -EPROTO))
 828                         goto exit;
 829
 830                 /* The urb is being unlinked */
 831                 if (status == -ENOENT || status == -ESHUTDOWN)
 832                         return;
 833
 834                 dev_err(dev, "urb cport in error %d (dropped)\n", status);
 835                 return;
 836         }
 837
 838         if (urb->actual_length < sizeof(*header)) {
 839                 dev_err(dev, "short message received\n");
 840                 goto exit;
 841         }
 842
 843         /* Extract the CPort id, which is packed in the message header */
 844         header = urb->transfer_buffer;
 845         cport_id = gb_message_cport_unpack(header);
 846
 847         if (cport_id_valid(hd, cport_id)) {
 848                 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
 849                                                         urb->actual_length);
 850         } else {
 851                 dev_err(dev, "invalid cport id %u received\n", cport_id);
 852         }
 853 exit:
 854         /* put our urb back in the request pool */
 855         retval = usb_submit_urb(urb, GFP_ATOMIC);
 856         if (retval)
 857                 dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
 858 }
 859
 860 static void cport_out_callback(struct urb *urb)
 861 {
 862         struct gb_message *message = urb->context;
 863         struct gb_host_device *hd = message->operation->connection->hd;
 864         struct es2_ap_dev *es2 = hd_to_es2(hd);
 865         int status = check_urb_status(urb);
 866         unsigned long flags;
 867
 868         gb_message_cport_clear(message->header);
 869
 870         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 871         message->hcpriv = NULL;
 872         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 873
 874         /*
 875          * Tell the submitter that the message send (attempt) is
 876          * complete, and report the status.
 877          */
 878         greybus_message_sent(hd, message, status);
 879
 880         free_urb(es2, urb);
 881 }
 882
 883 static struct arpc *arpc_alloc(void *payload, u16 size, u8 type)
 884 {
 885         struct arpc *rpc;
 886
 887         if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX)
 888                 return NULL;
 889
 890         rpc = kzalloc(sizeof(*rpc), GFP_KERNEL);
 891         if (!rpc)
 892                 return NULL;
 893
 894         INIT_LIST_HEAD(&rpc->list);
 895         rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL);
 896         if (!rpc->req)
 897                 goto err_free_rpc;
 898
 899         rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL);
 900         if (!rpc->resp)
 901                 goto err_free_req;
 902
 903         rpc->req->type = type;
 904         rpc->req->size = cpu_to_le16(sizeof(*rpc->req) + size);
 905         memcpy(rpc->req->data, payload, size);
 906
 907         init_completion(&rpc->response_received);
 908
 909         return rpc;
 910
 911 err_free_req:
 912         kfree(rpc->req);
 913 err_free_rpc:
 914         kfree(rpc);
 915
 916         return NULL;
 917 }
 918
 919 static void arpc_free(struct arpc *rpc)
 920 {
 921         kfree(rpc->req);
 922         kfree(rpc->resp);
 923         kfree(rpc);
 924 }
 925
 926 static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id)
 927 {
 928         struct arpc *rpc;
 929
 930         list_for_each_entry(rpc, &es2->arpcs, list) {
 931                 if (rpc->req->id == id)
 932                         return rpc;
 933         }
 934
 935         return NULL;
 936 }
 937
 938 static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc)
 939 {
 940         rpc->active = true;
 941         rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++);
 942         list_add_tail(&rpc->list, &es2->arpcs);
 943 }
 944
 945 static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc)
 946 {
 947         if (rpc->active) {
 948                 rpc->active = false;
 949                 list_del(&rpc->list);
 950         }
 951 }
 952
 953 static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout)
 954 {
 955         struct usb_device *udev = es2->usb_dev;
 956         int retval;
 957
 958         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 959                                  GB_APB_REQUEST_ARPC_RUN,
 960                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 961                                  USB_RECIP_INTERFACE,
 962                                  0, 0,
 963                                  rpc->req, le16_to_cpu(rpc->req->size),
 964                                  ES2_USB_CTRL_TIMEOUT);
 965         if (retval != le16_to_cpu(rpc->req->size)) {
 966                 dev_err(&udev->dev,
 967                         "failed to send ARPC request %d: %d\n",
 968                         rpc->req->type, retval);
 969                 if (retval > 0)
 970                         retval = -EIO;
 971                 return retval;
 972         }
 973
 974         return 0;
 975 }
 976
 977 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
 978                      size_t size, int *result, unsigned int timeout)
 979 {
 980         struct arpc *rpc;
 981         unsigned long flags;
 982         int retval;
 983
 984         if (result)
 985                 *result = 0;
 986
 987         rpc = arpc_alloc(payload, size, type);
 988         if (!rpc)
 989                 return -ENOMEM;
 990
 991         spin_lock_irqsave(&es2->arpc_lock, flags);
 992         arpc_add(es2, rpc);
 993         spin_unlock_irqrestore(&es2->arpc_lock, flags);
 994
 995         retval = arpc_send(es2, rpc, timeout);
 996         if (retval)
 997                 goto out_arpc_del;
 998
 999         retval = wait_for_completion_interruptible_timeout(
1000                                                 &rpc->response_received,
1001                                                 msecs_to_jiffies(timeout));
1002         if (retval <= 0) {
1003                 if (!retval)
1004                         retval = -ETIMEDOUT;
1005                 goto out_arpc_del;
1006         }
1007
1008         if (rpc->resp->result) {
1009                 retval = -EREMOTEIO;
1010                 if (result)
1011                         *result = rpc->resp->result;
1012         } else {
1013                 retval = 0;
1014         }
1015
1016 out_arpc_del:
1017         spin_lock_irqsave(&es2->arpc_lock, flags);
1018         arpc_del(es2, rpc);
1019         spin_unlock_irqrestore(&es2->arpc_lock, flags);
1020         arpc_free(rpc);
1021
1022         if (retval < 0 && retval != -EREMOTEIO) {
1023                 dev_err(&es2->usb_dev->dev,
1024                         "failed to execute ARPC: %d\n", retval);
1025         }
1026
1027         return retval;
1028 }
1029
1030 static void arpc_in_callback(struct urb *urb)
1031 {
1032         struct es2_ap_dev *es2 = urb->context;
1033         struct device *dev = &urb->dev->dev;
1034         int status = check_urb_status(urb);
1035         struct arpc *rpc;
1036         struct arpc_response_message *resp;
1037         unsigned long flags;
1038         int retval;
1039
1040         if (status) {
1041                 if ((status == -EAGAIN) || (status == -EPROTO))
1042                         goto exit;
1043
1044                 /* The urb is being unlinked */
1045                 if (status == -ENOENT || status == -ESHUTDOWN)
1046                         return;
1047
1048                 dev_err(dev, "arpc in-urb error %d (dropped)\n", status);
1049                 return;
1050         }
1051
1052         if (urb->actual_length < sizeof(*resp)) {
1053                 dev_err(dev, "short aprc response received\n");
1054                 goto exit;
1055         }
1056
1057         resp = urb->transfer_buffer;
1058         spin_lock_irqsave(&es2->arpc_lock, flags);
1059         rpc = arpc_find(es2, resp->id);
1060         if (!rpc) {
1061                 dev_err(dev, "invalid arpc response id received: %u\n",
1062                         le16_to_cpu(resp->id));
1063                 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1064                 goto exit;
1065         }
1066
1067         arpc_del(es2, rpc);
1068         memcpy(rpc->resp, resp, sizeof(*resp));
1069         complete(&rpc->response_received);
1070         spin_unlock_irqrestore(&es2->arpc_lock, flags);
1071
1072 exit:
1073         /* put our urb back in the request pool */
1074         retval = usb_submit_urb(urb, GFP_ATOMIC);
1075         if (retval)
1076                 dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval);
1077 }
1078
1079 #define APB1_LOG_MSG_SIZE       64
1080 static void apb_log_get(struct es2_ap_dev *es2, char *buf)
1081 {
1082         int retval;
1083
1084         do {
1085                 retval = usb_control_msg(es2->usb_dev,
1086                                         usb_rcvctrlpipe(es2->usb_dev, 0),
1087                                         GB_APB_REQUEST_LOG,
1088                                         USB_DIR_IN | USB_TYPE_VENDOR |
1089                                         USB_RECIP_INTERFACE,
1090                                         0x00, 0x00,
1091                                         buf,
1092                                         APB1_LOG_MSG_SIZE,
1093                                         ES2_USB_CTRL_TIMEOUT);
1094                 if (retval > 0)
1095                         kfifo_in(&es2->apb_log_fifo, buf, retval);
1096         } while (retval > 0);
1097 }
1098
1099 static int apb_log_poll(void *data)
1100 {
1101         struct es2_ap_dev *es2 = data;
1102         char *buf;
1103
1104         buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
1105         if (!buf)
1106                 return -ENOMEM;
1107
1108         while (!kthread_should_stop()) {
1109                 msleep(1000);
1110                 apb_log_get(es2, buf);
1111         }
1112
1113         kfree(buf);
1114
1115         return 0;
1116 }
1117
1118 static ssize_t apb_log_read(struct file *f, char __user *buf,
1119                                 size_t count, loff_t *ppos)
1120 {
1121         struct es2_ap_dev *es2 = file_inode(f)->i_private;
1122         ssize_t ret;
1123         size_t copied;
1124         char *tmp_buf;
1125
1126         if (count > APB1_LOG_SIZE)
1127                 count = APB1_LOG_SIZE;
1128
1129         tmp_buf = kmalloc(count, GFP_KERNEL);
1130         if (!tmp_buf)
1131                 return -ENOMEM;
1132
1133         copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count);
1134         ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
1135
1136         kfree(tmp_buf);
1137
1138         return ret;
1139 }
1140
1141 static const struct file_operations apb_log_fops = {
1142         .read   = apb_log_read,
1143 };
1144
1145 static void usb_log_enable(struct es2_ap_dev *es2)
1146 {
1147         if (!IS_ERR_OR_NULL(es2->apb_log_task))
1148                 return;
1149
1150         /* get log from APB1 */
1151         es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log");
1152         if (IS_ERR(es2->apb_log_task))
1153                 return;
1154         /* XXX We will need to rename this per APB */
1155         es2->apb_log_dentry = debugfs_create_file("apb_log", 0444,
1156                                                 gb_debugfs_get(), es2,
1157                                                 &apb_log_fops);
1158 }
1159
1160 static void usb_log_disable(struct es2_ap_dev *es2)
1161 {
1162         if (IS_ERR_OR_NULL(es2->apb_log_task))
1163                 return;
1164
1165         debugfs_remove(es2->apb_log_dentry);
1166         es2->apb_log_dentry = NULL;
1167
1168         kthread_stop(es2->apb_log_task);
1169         es2->apb_log_task = NULL;
1170 }
1171
1172 static ssize_t apb_log_enable_read(struct file *f, char __user *buf,
1173                                 size_t count, loff_t *ppos)
1174 {
1175         struct es2_ap_dev *es2 = file_inode(f)->i_private;
1176         int enable = !IS_ERR_OR_NULL(es2->apb_log_task);
1177         char tmp_buf[3];
1178
1179         sprintf(tmp_buf, "%d\n", enable);
1180         return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
1181 }
1182
1183 static ssize_t apb_log_enable_write(struct file *f, const char __user *buf,
1184                                 size_t count, loff_t *ppos)
1185 {
1186         int enable;
1187         ssize_t retval;
1188         struct es2_ap_dev *es2 = file_inode(f)->i_private;
1189
1190         retval = kstrtoint_from_user(buf, count, 10, &enable);
1191         if (retval)
1192                 return retval;
1193
1194         if (enable)
1195                 usb_log_enable(es2);
1196         else
1197                 usb_log_disable(es2);
1198
1199         return count;
1200 }
1201
1202 static const struct file_operations apb_log_enable_fops = {
1203         .read   = apb_log_enable_read,
1204         .write  = apb_log_enable_write,
1205 };
1206
1207 static int apb_get_cport_count(struct usb_device *udev)
1208 {
1209         int retval;
1210         __le16 *cport_count;
1211
1212         cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL);
1213         if (!cport_count)
1214                 return -ENOMEM;
1215
1216         retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
1217                                  GB_APB_REQUEST_CPORT_COUNT,
1218                                  USB_DIR_IN | USB_TYPE_VENDOR |
1219                                  USB_RECIP_INTERFACE, 0, 0, cport_count,
1220                                  sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT);
1221         if (retval != sizeof(*cport_count)) {
1222                 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1223                         retval);
1224
1225                 if (retval >= 0)
1226                         retval = -EIO;
1227
1228                 goto out;
1229         }
1230
1231         retval = le16_to_cpu(*cport_count);
1232
1233         /* We need to fit a CPort ID in one byte of a message header */
1234         if (retval > U8_MAX) {
1235                 retval = U8_MAX;
1236                 dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n");
1237         }
1238
1239 out:
1240         kfree(cport_count);
1241         return retval;
1242 }
1243
1244 /*
1245  * The ES2 USB Bridge device has 15 endpoints
1246  * 1 Control - usual USB stuff + AP -> APBridgeA messages
1247  * 7 Bulk IN - CPort data in
1248  * 7 Bulk OUT - CPort data out
1249  */
1250 static int ap_probe(struct usb_interface *interface,
1251                     const struct usb_device_id *id)
1252 {
1253         struct es2_ap_dev *es2;
1254         struct gb_host_device *hd;
1255         struct usb_device *udev;
1256         struct usb_host_interface *iface_desc;
1257         struct usb_endpoint_descriptor *endpoint;
1258         __u8 ep_addr;
1259         int retval;
1260         int i;
1261         int num_cports;
1262         bool bulk_out_found = false;
1263         bool bulk_in_found = false;
1264         bool arpc_in_found = false;
1265
1266         udev = usb_get_dev(interface_to_usbdev(interface));
1267
1268         num_cports = apb_get_cport_count(udev);
1269         if (num_cports < 0) {
1270                 usb_put_dev(udev);
1271                 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1272                         num_cports);
1273                 return num_cports;
1274         }
1275
1276         hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX,
1277                                 num_cports);
1278         if (IS_ERR(hd)) {
1279                 usb_put_dev(udev);
1280                 return PTR_ERR(hd);
1281         }
1282
1283         es2 = hd_to_es2(hd);
1284         es2->hd = hd;
1285         es2->usb_intf = interface;
1286         es2->usb_dev = udev;
1287         spin_lock_init(&es2->cport_out_urb_lock);
1288         INIT_KFIFO(es2->apb_log_fifo);
1289         usb_set_intfdata(interface, es2);
1290
1291         /*
1292          * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated
1293          * dynamically.
1294          */
1295         retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0);
1296         if (retval)
1297                 goto error;
1298         retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1);
1299         if (retval)
1300                 goto error;
1301
1302         /* find all bulk endpoints */
1303         iface_desc = interface->cur_altsetting;
1304         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1305                 endpoint = &iface_desc->endpoint[i].desc;
1306                 ep_addr = endpoint->bEndpointAddress;
1307
1308                 if (usb_endpoint_is_bulk_in(endpoint)) {
1309                         if (!bulk_in_found) {
1310                                 es2->cport_in.endpoint = ep_addr;
1311                                 bulk_in_found = true;
1312                         } else if (!arpc_in_found) {
1313                                 es2->arpc_endpoint_in = ep_addr;
1314                                 arpc_in_found = true;
1315                         } else {
1316                                 dev_warn(&udev->dev,
1317                                          "Unused bulk IN endpoint found: 0x%02x\n",
1318                                          ep_addr);
1319                         }
1320                         continue;
1321                 }
1322                 if (usb_endpoint_is_bulk_out(endpoint)) {
1323                         if (!bulk_out_found) {
1324                                 es2->cport_out_endpoint = ep_addr;
1325                                 bulk_out_found = true;
1326                         } else {
1327                                 dev_warn(&udev->dev,
1328                                          "Unused bulk OUT endpoint found: 0x%02x\n",
1329                                          ep_addr);
1330                         }
1331                         continue;
1332                 }
1333                 dev_warn(&udev->dev,
1334                          "Unknown endpoint type found, address 0x%02x\n",
1335                          ep_addr);
1336         }
1337         if (!bulk_in_found || !arpc_in_found || !bulk_out_found) {
1338                 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
1339                 retval = -ENODEV;
1340                 goto error;
1341         }
1342
1343         /* Allocate buffers for our cport in messages */
1344         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
1345                 struct urb *urb;
1346                 u8 *buffer;
1347
1348                 urb = usb_alloc_urb(0, GFP_KERNEL);
1349                 if (!urb) {
1350                         retval = -ENOMEM;
1351                         goto error;
1352                 }
1353                 es2->cport_in.urb[i] = urb;
1354
1355                 buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
1356                 if (!buffer) {
1357                         retval = -ENOMEM;
1358                         goto error;
1359                 }
1360
1361                 usb_fill_bulk_urb(urb, udev,
1362                                   usb_rcvbulkpipe(udev, es2->cport_in.endpoint),
1363                                   buffer, ES2_GBUF_MSG_SIZE_MAX,
1364                                   cport_in_callback, hd);
1365
1366                 es2->cport_in.buffer[i] = buffer;
1367         }
1368
1369         /* Allocate buffers for ARPC in messages */
1370         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
1371                 struct urb *urb;
1372                 u8 *buffer;
1373
1374                 urb = usb_alloc_urb(0, GFP_KERNEL);
1375                 if (!urb) {
1376                         retval = -ENOMEM;
1377                         goto error;
1378                 }
1379                 es2->arpc_urb[i] = urb;
1380
1381                 buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL);
1382                 if (!buffer) {
1383                         retval = -ENOMEM;
1384                         goto error;
1385                 }
1386
1387                 usb_fill_bulk_urb(urb, udev,
1388                                   usb_rcvbulkpipe(udev,
1389                                                   es2->arpc_endpoint_in),
1390                                   buffer, ARPC_IN_SIZE_MAX,
1391                                   arpc_in_callback, es2);
1392
1393                 es2->arpc_buffer[i] = buffer;
1394         }
1395
1396         /* Allocate urbs for our CPort OUT messages */
1397         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
1398                 struct urb *urb;
1399
1400                 urb = usb_alloc_urb(0, GFP_KERNEL);
1401                 if (!urb) {
1402                         retval = -ENOMEM;
1403                         goto error;
1404                 }
1405
1406                 es2->cport_out_urb[i] = urb;
1407                 es2->cport_out_urb_busy[i] = false;     /* just to be anal */
1408         }
1409
1410         /* XXX We will need to rename this per APB */
1411         es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable",
1412                                                         0644,
1413                                                         gb_debugfs_get(), es2,
1414                                                         &apb_log_enable_fops);
1415
1416         INIT_LIST_HEAD(&es2->arpcs);
1417         spin_lock_init(&es2->arpc_lock);
1418
1419         retval = es2_arpc_in_enable(es2);
1420         if (retval)
1421                 goto error;
1422
1423         retval = gb_hd_add(hd);
1424         if (retval)
1425                 goto err_disable_arpc_in;
1426
1427         retval = es2_cport_in_enable(es2, &es2->cport_in);
1428         if (retval)
1429                 goto err_hd_del;
1430
1431         return 0;
1432
1433 err_hd_del:
1434         gb_hd_del(hd);
1435 err_disable_arpc_in:
1436         es2_arpc_in_disable(es2);
1437 error:
1438         es2_destroy(es2);
1439
1440         return retval;
1441 }
1442
1443 static void ap_disconnect(struct usb_interface *interface)
1444 {
1445         struct es2_ap_dev *es2 = usb_get_intfdata(interface);
1446
1447         gb_hd_del(es2->hd);
1448
1449         es2_cport_in_disable(es2, &es2->cport_in);
1450         es2_arpc_in_disable(es2);
1451
1452         es2_destroy(es2);
1453 }
1454
1455 static struct usb_driver es2_ap_driver = {
1456         .name =         "es2_ap_driver",
1457         .probe =        ap_probe,
1458         .disconnect =   ap_disconnect,
1459         .id_table =     id_table,
1460         .soft_unbind =  1,
1461 };
1462
1463 module_usb_driver(es2_ap_driver);
1464
1465 MODULE_LICENSE("GPL v2");
1466 MODULE_AUTHOR("Greg Kroah-Hartman <[email protected]>");