drivers/staging/greybus/es2.c

   1 /*
   2  * Greybus "AP" USB driver for "ES2" controller chips
   3  *
   4  * Copyright 2014-2015 Google Inc.
   5  * Copyright 2014-2015 Linaro Ltd.
   6  *
   7  * Released under the GPLv2 only.
   8  */
   9 #include <linux/kthread.h>
  10 #include <linux/sizes.h>
  11 #include <linux/usb.h>
  12 #include <linux/kfifo.h>
  13 #include <linux/debugfs.h>
  14 #include <linux/list.h>
  15 #include <asm/unaligned.h>
  16
  17 #include "arpc.h"
  18 #include "greybus.h"
  19 #include "greybus_trace.h"
  20 #include "connection.h"
  21
  22
  23 /* Default timeout for USB vendor requests. */
  24 #define ES2_USB_CTRL_TIMEOUT    500
  25
  26 /* Default timeout for ARPC CPort requests */
  27 #define ES2_ARPC_CPORT_TIMEOUT  500
  28
  29 /* Fixed CPort numbers */
  30 #define ES2_CPORT_CDSI0         16
  31 #define ES2_CPORT_CDSI1         17
  32
  33 /* Memory sizes for the buffers sent to/from the ES2 controller */
  34 #define ES2_GBUF_MSG_SIZE_MAX   2048
  35
  36 /* Memory sizes for the ARPC buffers */
  37 #define ARPC_OUT_SIZE_MAX       U16_MAX
  38 #define ARPC_IN_SIZE_MAX        128
  39
  40 static const struct usb_device_id id_table[] = {
  41         { USB_DEVICE(0x18d1, 0x1eaf) },
  42         { },
  43 };
  44 MODULE_DEVICE_TABLE(usb, id_table);
  45
  46 #define APB1_LOG_SIZE           SZ_16K
  47
  48 /*
  49  * Number of CPort IN urbs in flight at any point in time.
  50  * Adjust if we are having stalls in the USB buffer due to not enough urbs in
  51  * flight.
  52  */
  53 #define NUM_CPORT_IN_URB        4
  54
  55 /* Number of CPort OUT urbs in flight at any point in time.
  56  * Adjust if we get messages saying we are out of urbs in the system log.
  57  */
  58 #define NUM_CPORT_OUT_URB       8
  59
  60 /*
  61  * Number of ARPC in urbs in flight at any point in time.
  62  */
  63 #define NUM_ARPC_IN_URB         2
  64
  65 /*
  66  * @endpoint: bulk in endpoint for CPort data
  67  * @urb: array of urbs for the CPort in messages
  68  * @buffer: array of buffers for the @cport_in_urb urbs
  69  */
  70 struct es2_cport_in {
  71         __u8 endpoint;
  72         struct urb *urb[NUM_CPORT_IN_URB];
  73         u8 *buffer[NUM_CPORT_IN_URB];
  74 };
  75
  76 /**
  77  * es2_ap_dev - ES2 USB Bridge to AP structure
  78  * @usb_dev: pointer to the USB device we are.
  79  * @usb_intf: pointer to the USB interface we are bound to.
  80  * @hd: pointer to our gb_host_device structure
  81
  82  * @cport_in: endpoint, urbs and buffer for cport in messages
  83  * @cport_out_endpoint: endpoint for for cport out messages
  84  * @cport_out_urb: array of urbs for the CPort out messages
  85  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
  86  *                      not.
  87  * @cport_out_urb_cancelled: array of flags indicating whether the
  88  *                      corresponding @cport_out_urb is being cancelled
  89  * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
  90  *
  91  * @apb_log_task: task pointer for logging thread
  92  * @apb_log_dentry: file system entry for the log file interface
  93  * @apb_log_enable_dentry: file system entry for enabling logging
  94  * @apb_log_fifo: kernel FIFO to carry logged data
  95  * @arpc_urb: array of urbs for the ARPC in messages
  96  * @arpc_buffer: array of buffers for the @arpc_urb urbs
  97  * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC
  98  * @arpc_id_cycle: gives an unique id to ARPC
  99  * @arpc_lock: locks ARPC list
 100  * @arpcs: list of in progress ARPCs
 101  */
 102 struct es2_ap_dev {
 103         struct usb_device *usb_dev;
 104         struct usb_interface *usb_intf;
 105         struct gb_host_device *hd;
 106
 107         struct es2_cport_in cport_in;
 108         __u8 cport_out_endpoint;
 109         struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
 110         bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
 111         bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
 112         spinlock_t cport_out_urb_lock;
 113
 114         bool cdsi1_in_use;
 115
 116         struct task_struct *apb_log_task;
 117         struct dentry *apb_log_dentry;
 118         struct dentry *apb_log_enable_dentry;
 119         DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);
 120
 121         __u8 arpc_endpoint_in;
 122         struct urb *arpc_urb[NUM_ARPC_IN_URB];
 123         u8 *arpc_buffer[NUM_ARPC_IN_URB];
 124
 125         int arpc_id_cycle;
 126         spinlock_t arpc_lock;
 127         struct list_head arpcs;
 128 };
 129
 130 struct arpc {
 131         struct list_head list;
 132         struct arpc_request_message *req;
 133         struct arpc_response_message *resp;
 134         struct completion response_received;
 135         bool active;
 136 };
 137
 138 static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
 139 {
 140         return (struct es2_ap_dev *)&hd->hd_priv;
 141 }
 142
 143 static void cport_out_callback(struct urb *urb);
 144 static void usb_log_enable(struct es2_ap_dev *es2);
 145 static void usb_log_disable(struct es2_ap_dev *es2);
 146 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
 147                      size_t size, int *result, unsigned int timeout);
 148
 149 static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 150 {
 151         struct usb_device *udev = es2->usb_dev;
 152         u8 *data;
 153         int retval;
 154
 155         data = kmemdup(req, size, GFP_KERNEL);
 156         if (!data)
 157                 return -ENOMEM;
 158
 159         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 160                                  cmd,
 161                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 162                                  USB_RECIP_INTERFACE,
 163                                  0, 0, data, size, ES2_USB_CTRL_TIMEOUT);
 164         if (retval < 0)
 165                 dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
 166         else
 167                 retval = 0;
 168
 169         kfree(data);
 170         return retval;
 171 }
 172
 173 static void ap_urb_complete(struct urb *urb)
 174 {
 175         struct usb_ctrlrequest *dr = urb->context;
 176
 177         kfree(dr);
 178         usb_free_urb(urb);
 179 }
 180
 181 static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 182 {
 183         struct usb_device *udev = es2->usb_dev;
 184         struct urb *urb;
 185         struct usb_ctrlrequest *dr;
 186         u8 *buf;
 187         int retval;
 188
 189         urb = usb_alloc_urb(0, GFP_ATOMIC);
 190         if (!urb)
 191                 return -ENOMEM;
 192
 193         dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
 194         if (!dr) {
 195                 usb_free_urb(urb);
 196                 return -ENOMEM;
 197         }
 198
 199         buf = (u8 *)dr + sizeof(*dr);
 200         memcpy(buf, req, size);
 201
 202         dr->bRequest = cmd;
 203         dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
 204         dr->wValue = 0;
 205         dr->wIndex = 0;
 206         dr->wLength = cpu_to_le16(size);
 207
 208         usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
 209                              (unsigned char *)dr, buf, size,
 210                              ap_urb_complete, dr);
 211         retval = usb_submit_urb(urb, GFP_ATOMIC);
 212         if (retval) {
 213                 usb_free_urb(urb);
 214                 kfree(dr);
 215         }
 216         return retval;
 217 }
 218
 219 static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
 220                      bool async)
 221 {
 222         struct es2_ap_dev *es2 = hd_to_es2(hd);
 223
 224         if (async)
 225                 return output_async(es2, req, size, cmd);
 226
 227         return output_sync(es2, req, size, cmd);
 228 }
 229
 230 static int es2_cport_in_enable(struct es2_ap_dev *es2,
 231                                 struct es2_cport_in *cport_in)
 232 {
 233         struct urb *urb;
 234         int ret;
 235         int i;
 236
 237         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 238                 urb = cport_in->urb[i];
 239
 240                 ret = usb_submit_urb(urb, GFP_KERNEL);
 241                 if (ret) {
 242                         dev_err(&es2->usb_dev->dev,
 243                                         "failed to submit in-urb: %d\n", ret);
 244                         goto err_kill_urbs;
 245                 }
 246         }
 247
 248         return 0;
 249
 250 err_kill_urbs:
 251         for (--i; i >= 0; --i) {
 252                 urb = cport_in->urb[i];
 253                 usb_kill_urb(urb);
 254         }
 255
 256         return ret;
 257 }
 258
 259 static void es2_cport_in_disable(struct es2_ap_dev *es2,
 260                                 struct es2_cport_in *cport_in)
 261 {
 262         struct urb *urb;
 263         int i;
 264
 265         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 266                 urb = cport_in->urb[i];
 267                 usb_kill_urb(urb);
 268         }
 269 }
 270
 271 static int es2_arpc_in_enable(struct es2_ap_dev *es2)
 272 {
 273         struct urb *urb;
 274         int ret;
 275         int i;
 276
 277         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 278                 urb = es2->arpc_urb[i];
 279
 280                 ret = usb_submit_urb(urb, GFP_KERNEL);
 281                 if (ret) {
 282                         dev_err(&es2->usb_dev->dev,
 283                                 "failed to submit arpc in-urb: %d\n", ret);
 284                         goto err_kill_urbs;
 285                 }
 286         }
 287
 288         return 0;
 289
 290 err_kill_urbs:
 291         for (--i; i >= 0; --i) {
 292                 urb = es2->arpc_urb[i];
 293                 usb_kill_urb(urb);
 294         }
 295
 296         return ret;
 297 }
 298
 299 static void es2_arpc_in_disable(struct es2_ap_dev *es2)
 300 {
 301         struct urb *urb;
 302         int i;
 303
 304         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 305                 urb = es2->arpc_urb[i];
 306                 usb_kill_urb(urb);
 307         }
 308 }
 309
 310 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
 311 {
 312         struct urb *urb = NULL;
 313         unsigned long flags;
 314         int i;
 315
 316         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 317
 318         /* Look in our pool of allocated urbs first, as that's the "fastest" */
 319         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 320                 if (es2->cport_out_urb_busy[i] == false &&
 321                                 es2->cport_out_urb_cancelled[i] == false) {
 322                         es2->cport_out_urb_busy[i] = true;
 323                         urb = es2->cport_out_urb[i];
 324                         break;
 325                 }
 326         }
 327         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 328         if (urb)
 329                 return urb;
 330
 331         /*
 332          * Crap, pool is empty, complain to the syslog and go allocate one
 333          * dynamically as we have to succeed.
 334          */
 335         dev_dbg(&es2->usb_dev->dev,
 336                 "No free CPort OUT urbs, having to dynamically allocate one!\n");
 337         return usb_alloc_urb(0, gfp_mask);
 338 }
 339
 340 static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
 341 {
 342         unsigned long flags;
 343         int i;
 344         /*
 345          * See if this was an urb in our pool, if so mark it "free", otherwise
 346          * we need to free it ourselves.
 347          */
 348         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 349         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 350                 if (urb == es2->cport_out_urb[i]) {
 351                         es2->cport_out_urb_busy[i] = false;
 352                         urb = NULL;
 353                         break;
 354                 }
 355         }
 356         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 357
 358         /* If urb is not NULL, then we need to free this urb */
 359         usb_free_urb(urb);
 360 }
 361
 362 /*
 363  * We (ab)use the operation-message header pad bytes to transfer the
 364  * cport id in order to minimise overhead.
 365  */
 366 static void
 367 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
 368 {
 369         header->pad[0] = cport_id;
 370 }
 371
 372 /* Clear the pad bytes used for the CPort id */
 373 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
 374 {
 375         header->pad[0] = 0;
 376 }
 377
 378 /* Extract the CPort id packed into the header, and clear it */
 379 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
 380 {
 381         u16 cport_id = header->pad[0];
 382
 383         gb_message_cport_clear(header);
 384
 385         return cport_id;
 386 }
 387
 388 /*
 389  * Returns zero if the message was successfully queued, or a negative errno
 390  * otherwise.
 391  */
 392 static int message_send(struct gb_host_device *hd, u16 cport_id,
 393                         struct gb_message *message, gfp_t gfp_mask)
 394 {
 395         struct es2_ap_dev *es2 = hd_to_es2(hd);
 396         struct usb_device *udev = es2->usb_dev;
 397         size_t buffer_size;
 398         int retval;
 399         struct urb *urb;
 400         unsigned long flags;
 401
 402         /*
 403          * The data actually transferred will include an indication
 404          * of where the data should be sent.  Do one last check of
 405          * the target CPort id before filling it in.
 406          */
 407         if (!cport_id_valid(hd, cport_id)) {
 408                 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
 409                 return -EINVAL;
 410         }
 411
 412         /* Find a free urb */
 413         urb = next_free_urb(es2, gfp_mask);
 414         if (!urb)
 415                 return -ENOMEM;
 416
 417         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 418         message->hcpriv = urb;
 419         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 420
 421         /* Pack the cport id into the message header */
 422         gb_message_cport_pack(message->header, cport_id);
 423
 424         buffer_size = sizeof(*message->header) + message->payload_size;
 425
 426         usb_fill_bulk_urb(urb, udev,
 427                           usb_sndbulkpipe(udev,
 428                                           es2->cport_out_endpoint),
 429                           message->buffer, buffer_size,
 430                           cport_out_callback, message);
 431         urb->transfer_flags |= URB_ZERO_PACKET;
 432
 433         trace_gb_message_submit(message);
 434
 435         retval = usb_submit_urb(urb, gfp_mask);
 436         if (retval) {
 437                 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
 438
 439                 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 440                 message->hcpriv = NULL;
 441                 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 442
 443                 free_urb(es2, urb);
 444                 gb_message_cport_clear(message->header);
 445
 446                 return retval;
 447         }
 448
 449         return 0;
 450 }
 451
 452 /*
 453  * Can not be called in atomic context.
 454  */
 455 static void message_cancel(struct gb_message *message)
 456 {
 457         struct gb_host_device *hd = message->operation->connection->hd;
 458         struct es2_ap_dev *es2 = hd_to_es2(hd);
 459         struct urb *urb;
 460         int i;
 461
 462         might_sleep();
 463
 464         spin_lock_irq(&es2->cport_out_urb_lock);
 465         urb = message->hcpriv;
 466
 467         /* Prevent dynamically allocated urb from being deallocated. */
 468         usb_get_urb(urb);
 469
 470         /* Prevent pre-allocated urb from being reused. */
 471         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 472                 if (urb == es2->cport_out_urb[i]) {
 473                         es2->cport_out_urb_cancelled[i] = true;
 474                         break;
 475                 }
 476         }
 477         spin_unlock_irq(&es2->cport_out_urb_lock);
 478
 479         usb_kill_urb(urb);
 480
 481         if (i < NUM_CPORT_OUT_URB) {
 482                 spin_lock_irq(&es2->cport_out_urb_lock);
 483                 es2->cport_out_urb_cancelled[i] = false;
 484                 spin_unlock_irq(&es2->cport_out_urb_lock);
 485         }
 486
 487         usb_free_urb(urb);
 488 }
 489
 490 static int es2_cport_allocate(struct gb_host_device *hd, int cport_id,
 491                                 unsigned long flags)
 492 {
 493         struct es2_ap_dev *es2 = hd_to_es2(hd);
 494         struct ida *id_map = &hd->cport_id_map;
 495         int ida_start, ida_end;
 496
 497         switch (cport_id) {
 498         case ES2_CPORT_CDSI0:
 499         case ES2_CPORT_CDSI1:
 500                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 501                 return -EBUSY;
 502         }
 503
 504         if (flags & GB_CONNECTION_FLAG_OFFLOADED &&
 505                         flags & GB_CONNECTION_FLAG_CDSI1) {
 506                 if (es2->cdsi1_in_use) {
 507                         dev_err(&hd->dev, "CDSI1 already in use\n");
 508                         return -EBUSY;
 509                 }
 510
 511                 es2->cdsi1_in_use = true;
 512
 513                 return ES2_CPORT_CDSI1;
 514         }
 515
 516         if (cport_id < 0) {
 517                 ida_start = 0;
 518                 ida_end = hd->num_cports;
 519         } else if (cport_id < hd->num_cports) {
 520                 ida_start = cport_id;
 521                 ida_end = cport_id + 1;
 522         } else {
 523                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 524                 return -EINVAL;
 525         }
 526
 527         return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
 528 }
 529
 530 static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
 531 {
 532         struct es2_ap_dev *es2 = hd_to_es2(hd);
 533
 534         switch (cport_id) {
 535         case ES2_CPORT_CDSI1:
 536                 es2->cdsi1_in_use = false;
 537                 return;
 538         }
 539
 540         ida_simple_remove(&hd->cport_id_map, cport_id);
 541 }
 542
 543 static int cport_enable(struct gb_host_device *hd, u16 cport_id,
 544                         unsigned long flags)
 545 {
 546         struct es2_ap_dev *es2 = hd_to_es2(hd);
 547         struct usb_device *udev = es2->usb_dev;
 548         struct gb_apb_request_cport_flags *req;
 549         u32 connection_flags;
 550         int ret;
 551
 552         req = kzalloc(sizeof(*req), GFP_KERNEL);
 553         if (!req)
 554                 return -ENOMEM;
 555
 556         connection_flags = 0;
 557         if (flags & GB_CONNECTION_FLAG_CONTROL)
 558                 connection_flags |= GB_APB_CPORT_FLAG_CONTROL;
 559         if (flags & GB_CONNECTION_FLAG_HIGH_PRIO)
 560                 connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO;
 561
 562         req->flags = cpu_to_le32(connection_flags);
 563
 564         dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__,
 565                         cport_id, connection_flags);
 566
 567         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 568                                 GB_APB_REQUEST_CPORT_FLAGS,
 569                                 USB_DIR_OUT | USB_TYPE_VENDOR |
 570                                 USB_RECIP_INTERFACE, cport_id, 0,
 571                                 req, sizeof(*req), ES2_USB_CTRL_TIMEOUT);
 572         if (ret != sizeof(*req)) {
 573                 dev_err(&udev->dev, "failed to set cport flags for port %d\n",
 574                                 cport_id);
 575                 if (ret >= 0)
 576                         ret = -EIO;
 577
 578                 goto out;
 579         }
 580
 581         ret = 0;
 582 out:
 583         kfree(req);
 584
 585         return ret;
 586 }
 587
 588 static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id)
 589 {
 590         struct es2_ap_dev *es2 = hd_to_es2(hd);
 591         struct device *dev = &es2->usb_dev->dev;
 592         struct arpc_cport_connected_req req;
 593         int ret;
 594
 595         req.cport_id = cpu_to_le16(cport_id);
 596         ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req),
 597                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 598         if (ret) {
 599                 dev_err(dev, "failed to set connected state for cport %u: %d\n",
 600                                 cport_id, ret);
 601                 return ret;
 602         }
 603
 604         return 0;
 605 }
 606
 607 static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id)
 608 {
 609         struct es2_ap_dev *es2 = hd_to_es2(hd);
 610         struct device *dev = &es2->usb_dev->dev;
 611         struct arpc_cport_flush_req req;
 612         int ret;
 613
 614         req.cport_id = cpu_to_le16(cport_id);
 615         ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req),
 616                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 617         if (ret) {
 618                 dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret);
 619                 return ret;
 620         }
 621
 622         return 0;
 623 }
 624
 625 static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id,
 626                                 u8 phase, unsigned int timeout)
 627 {
 628         struct es2_ap_dev *es2 = hd_to_es2(hd);
 629         struct device *dev = &es2->usb_dev->dev;
 630         struct arpc_cport_shutdown_req req;
 631         int result;
 632         int ret;
 633
 634         if (timeout > U16_MAX)
 635                 return -EINVAL;
 636
 637         req.cport_id = cpu_to_le16(cport_id);
 638         req.timeout = cpu_to_le16(timeout);
 639         req.phase = phase;
 640         ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req),
 641                         &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
 642         if (ret) {
 643                 dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n",
 644                                 cport_id, ret, result);
 645                 return ret;
 646         }
 647
 648         return 0;
 649 }
 650
 651 static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id,
 652                                 size_t peer_space, unsigned int timeout)
 653 {
 654         struct es2_ap_dev *es2 = hd_to_es2(hd);
 655         struct device *dev = &es2->usb_dev->dev;
 656         struct arpc_cport_quiesce_req req;
 657         int result;
 658         int ret;
 659
 660         if (peer_space > U16_MAX)
 661                 return -EINVAL;
 662
 663         if (timeout > U16_MAX)
 664                 return -EINVAL;
 665
 666         req.cport_id = cpu_to_le16(cport_id);
 667         req.peer_space = cpu_to_le16(peer_space);
 668         req.timeout = cpu_to_le16(timeout);
 669         ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req),
 670                         &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
 671         if (ret) {
 672                 dev_err(dev, "failed to quiesce cport %u: %d (%d)\n",
 673                                 cport_id, ret, result);
 674                 return ret;
 675         }
 676
 677         return 0;
 678 }
 679
 680 static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id)
 681 {
 682         struct es2_ap_dev *es2 = hd_to_es2(hd);
 683         struct device *dev = &es2->usb_dev->dev;
 684         struct arpc_cport_clear_req req;
 685         int ret;
 686
 687         req.cport_id = cpu_to_le16(cport_id);
 688         ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req),
 689                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 690         if (ret) {
 691                 dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret);
 692                 return ret;
 693         }
 694
 695         return 0;
 696 }
 697
 698 static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id)
 699 {
 700         int retval;
 701         struct es2_ap_dev *es2 = hd_to_es2(hd);
 702         struct usb_device *udev = es2->usb_dev;
 703
 704         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 705                                  GB_APB_REQUEST_LATENCY_TAG_EN,
 706                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 707                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 708                                  0, ES2_USB_CTRL_TIMEOUT);
 709
 710         if (retval < 0)
 711                 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
 712                         cport_id);
 713         return retval;
 714 }
 715
 716 static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
 717 {
 718         int retval;
 719         struct es2_ap_dev *es2 = hd_to_es2(hd);
 720         struct usb_device *udev = es2->usb_dev;
 721
 722         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 723                                  GB_APB_REQUEST_LATENCY_TAG_DIS,
 724                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 725                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 726                                  0, ES2_USB_CTRL_TIMEOUT);
 727
 728         if (retval < 0)
 729                 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
 730                         cport_id);
 731         return retval;
 732 }
 733
 734 static struct gb_hd_driver es2_driver = {
 735         .hd_priv_size                   = sizeof(struct es2_ap_dev),
 736         .message_send                   = message_send,
 737         .message_cancel                 = message_cancel,
 738         .cport_allocate                 = es2_cport_allocate,
 739         .cport_release                  = es2_cport_release,
 740         .cport_enable                   = cport_enable,
 741         .cport_connected                = es2_cport_connected,
 742         .cport_flush                    = es2_cport_flush,
 743         .cport_shutdown                 = es2_cport_shutdown,
 744         .cport_quiesce                  = es2_cport_quiesce,
 745         .cport_clear                    = es2_cport_clear,
 746         .latency_tag_enable             = latency_tag_enable,
 747         .latency_tag_disable            = latency_tag_disable,
 748         .output                         = output,
 749 };
 750
 751 /* Common function to report consistent warnings based on URB status */
 752 static int check_urb_status(struct urb *urb)
 753 {
 754         struct device *dev = &urb->dev->dev;
 755         int status = urb->status;
 756
 757         switch (status) {
 758         case 0:
 759                 return 0;
 760
 761         case -EOVERFLOW:
 762                 dev_err(dev, "%s: overflow actual length is %d\n",
 763                         __func__, urb->actual_length);
 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 <gregkh@linuxfoundation.org>");