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 "kernel_ver.h"
  21 #include "connection.h"
  22
  23
  24 /* Default timeout for USB vendor requests. */
  25 #define ES2_USB_CTRL_TIMEOUT    500
  26
  27 /* Default timeout for ARPC CPort requests */
  28 #define ES2_ARPC_CPORT_TIMEOUT  500
  29
  30 /* Fixed CPort numbers */
  31 #define ES2_CPORT_CDSI0         16
  32 #define ES2_CPORT_CDSI1         17
  33
  34 /* Memory sizes for the buffers sent to/from the ES2 controller */
  35 #define ES2_GBUF_MSG_SIZE_MAX   2048
  36
  37 /* Memory sizes for the ARPC buffers */
  38 #define ARPC_OUT_SIZE_MAX       U16_MAX
  39 #define ARPC_IN_SIZE_MAX        128
  40
  41 static const struct usb_device_id id_table[] = {
  42         { USB_DEVICE(0x18d1, 0x1eaf) },
  43         { },
  44 };
  45 MODULE_DEVICE_TABLE(usb, id_table);
  46
  47 #define APB1_LOG_SIZE           SZ_16K
  48
  49 /* Number of bulk in and bulk out couple */
  50 #define NUM_BULKS               7
  51
  52 /* Expected number of bulk out endpoints */
  53 #define NUM_BULKS_OUT           NUM_BULKS
  54
  55 /* Expected number of bulk in endpoints (including ARPC endpoint) */
  56 #define NUM_BULKS_IN            (NUM_BULKS + 1)
  57
  58 /*
  59  * Number of CPort IN urbs in flight at any point in time.
  60  * Adjust if we are having stalls in the USB buffer due to not enough urbs in
  61  * flight.
  62  */
  63 #define NUM_CPORT_IN_URB        4
  64
  65 /* Number of CPort OUT urbs in flight at any point in time.
  66  * Adjust if we get messages saying we are out of urbs in the system log.
  67  */
  68 #define NUM_CPORT_OUT_URB       (8 * NUM_BULKS)
  69
  70 /*
  71  * Number of ARPC in urbs in flight at any point in time.
  72  */
  73 #define NUM_ARPC_IN_URB         2
  74
  75 /*
  76  * @endpoint: bulk in endpoint for CPort data
  77  * @urb: array of urbs for the CPort in messages
  78  * @buffer: array of buffers for the @cport_in_urb urbs
  79  */
  80 struct es2_cport_in {
  81         __u8 endpoint;
  82         struct urb *urb[NUM_CPORT_IN_URB];
  83         u8 *buffer[NUM_CPORT_IN_URB];
  84 };
  85
  86 /*
  87  * @endpoint: bulk out endpoint for CPort data
  88  */
  89 struct es2_cport_out {
  90         __u8 endpoint;
  91 };
  92
  93 /**
  94  * es2_ap_dev - ES2 USB Bridge to AP structure
  95  * @usb_dev: pointer to the USB device we are.
  96  * @usb_intf: pointer to the USB interface we are bound to.
  97  * @hd: pointer to our gb_host_device structure
  98
  99  * @cport_in: endpoint, urbs and buffer for cport in messages
 100  * @cport_out: endpoint for for cport out messages
 101  * @cport_out_urb: array of urbs for the CPort out messages
 102  * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
 103  *                      not.
 104  * @cport_out_urb_cancelled: array of flags indicating whether the
 105  *                      corresponding @cport_out_urb is being cancelled
 106  * @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
 107  *
 108  * @apb_log_task: task pointer for logging thread
 109  * @apb_log_dentry: file system entry for the log file interface
 110  * @apb_log_enable_dentry: file system entry for enabling logging
 111  * @apb_log_fifo: kernel FIFO to carry logged data
 112  * @arpc_urb: array of urbs for the ARPC in messages
 113  * @arpc_buffer: array of buffers for the @arpc_urb urbs
 114  * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC
 115  * @arpc_id_cycle: gives an unique id to ARPC
 116  * @arpc_lock: locks ARPC list
 117  * @arpcs: list of in progress ARPCs
 118  */
 119 struct es2_ap_dev {
 120         struct usb_device *usb_dev;
 121         struct usb_interface *usb_intf;
 122         struct gb_host_device *hd;
 123
 124         struct es2_cport_in cport_in[NUM_BULKS];
 125         struct es2_cport_out cport_out[NUM_BULKS];
 126         struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
 127         bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
 128         bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
 129         spinlock_t cport_out_urb_lock;
 130
 131         bool cdsi1_in_use;
 132
 133         int *cport_to_ep;
 134
 135         struct task_struct *apb_log_task;
 136         struct dentry *apb_log_dentry;
 137         struct dentry *apb_log_enable_dentry;
 138         DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);
 139
 140         __u8 arpc_endpoint_in;
 141         struct urb *arpc_urb[NUM_ARPC_IN_URB];
 142         u8 *arpc_buffer[NUM_ARPC_IN_URB];
 143
 144         int arpc_id_cycle;
 145         spinlock_t arpc_lock;
 146         struct list_head arpcs;
 147 };
 148
 149 /**
 150  * cport_to_ep - information about cport to endpoints mapping
 151  * @cport_id: the id of cport to map to endpoints
 152  * @endpoint_in: the endpoint number to use for in transfer
 153  * @endpoint_out: he endpoint number to use for out transfer
 154  */
 155 struct cport_to_ep {
 156         __le16 cport_id;
 157         __u8 endpoint_in;
 158         __u8 endpoint_out;
 159 };
 160
 161 /**
 162  * timesync_enable_request - Enable timesync in an APBridge
 163  * @count: number of TimeSync Pulses to expect
 164  * @frame_time: the initial FrameTime at the first TimeSync Pulse
 165  * @strobe_delay: the expected delay in microseconds between each TimeSync Pulse
 166  * @refclk: The AP mandated reference clock to run FrameTime at
 167  */
 168 struct timesync_enable_request {
 169         __u8    count;
 170         __le64  frame_time;
 171         __le32  strobe_delay;
 172         __le32  refclk;
 173 } __packed;
 174
 175 /**
 176  * timesync_authoritative_request - Transmit authoritative FrameTime to APBridge
 177  * @frame_time: An array of authoritative FrameTimes provided by the SVC
 178  *              and relayed to the APBridge by the AP
 179  */
 180 struct timesync_authoritative_request {
 181         __le64  frame_time[GB_TIMESYNC_MAX_STROBES];
 182 } __packed;
 183
 184 struct arpc {
 185         struct list_head list;
 186         struct arpc_request_message *req;
 187         struct arpc_response_message *resp;
 188         struct completion response_received;
 189         bool active;
 190 };
 191
 192 static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
 193 {
 194         return (struct es2_ap_dev *)&hd->hd_priv;
 195 }
 196
 197 static void cport_out_callback(struct urb *urb);
 198 static void usb_log_enable(struct es2_ap_dev *es2);
 199 static void usb_log_disable(struct es2_ap_dev *es2);
 200 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
 201                      size_t size, int *result, unsigned int timeout);
 202
 203 /* Get the endpoints pair mapped to the cport */
 204 static int cport_to_ep_pair(struct es2_ap_dev *es2, u16 cport_id)
 205 {
 206         if (cport_id >= es2->hd->num_cports)
 207                 return 0;
 208         return es2->cport_to_ep[cport_id];
 209 }
 210
 211 /* Disable for now until we work all of this out to keep a warning-free build */
 212 #if 0
 213 /* Test if the endpoints pair is already mapped to a cport */
 214 static int ep_pair_in_use(struct es2_ap_dev *es2, int ep_pair)
 215 {
 216         int i;
 217
 218         for (i = 0; i < es2->hd->num_cports; i++) {
 219                 if (es2->cport_to_ep[i] == ep_pair)
 220                         return 1;
 221         }
 222         return 0;
 223 }
 224
 225 /* Configure the endpoint mapping and send the request to APBridge */
 226 static int map_cport_to_ep(struct es2_ap_dev *es2,
 227                                 u16 cport_id, int ep_pair)
 228 {
 229         int retval;
 230         struct cport_to_ep *cport_to_ep;
 231
 232         if (ep_pair < 0 || ep_pair >= NUM_BULKS)
 233                 return -EINVAL;
 234         if (cport_id >= es2->hd->num_cports)
 235                 return -EINVAL;
 236         if (ep_pair && ep_pair_in_use(es2, ep_pair))
 237                 return -EINVAL;
 238
 239         cport_to_ep = kmalloc(sizeof(*cport_to_ep), GFP_KERNEL);
 240         if (!cport_to_ep)
 241                 return -ENOMEM;
 242
 243         es2->cport_to_ep[cport_id] = ep_pair;
 244         cport_to_ep->cport_id = cpu_to_le16(cport_id);
 245         cport_to_ep->endpoint_in = es2->cport_in[ep_pair].endpoint;
 246         cport_to_ep->endpoint_out = es2->cport_out[ep_pair].endpoint;
 247
 248         retval = usb_control_msg(es2->usb_dev,
 249                                  usb_sndctrlpipe(es2->usb_dev, 0),
 250                                  GB_APB_REQUEST_EP_MAPPING,
 251                                  USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 252                                  0x00, 0x00,
 253                                  (char *)cport_to_ep,
 254                                  sizeof(*cport_to_ep),
 255                                  ES2_USB_CTRL_TIMEOUT);
 256         if (retval == sizeof(*cport_to_ep))
 257                 retval = 0;
 258         kfree(cport_to_ep);
 259
 260         return retval;
 261 }
 262
 263 /* Unmap a cport: use the muxed endpoints pair */
 264 static int unmap_cport(struct es2_ap_dev *es2, u16 cport_id)
 265 {
 266         return map_cport_to_ep(es2, cport_id, 0);
 267 }
 268 #endif
 269
 270 static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 271 {
 272         struct usb_device *udev = es2->usb_dev;
 273         u8 *data;
 274         int retval;
 275
 276         data = kmalloc(size, GFP_KERNEL);
 277         if (!data)
 278                 return -ENOMEM;
 279         memcpy(data, req, size);
 280
 281         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 282                                  cmd,
 283                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 284                                  USB_RECIP_INTERFACE,
 285                                  0, 0, data, size, ES2_USB_CTRL_TIMEOUT);
 286         if (retval < 0)
 287                 dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
 288         else
 289                 retval = 0;
 290
 291         kfree(data);
 292         return retval;
 293 }
 294
 295 static void ap_urb_complete(struct urb *urb)
 296 {
 297         struct usb_ctrlrequest *dr = urb->context;
 298
 299         kfree(dr);
 300         usb_free_urb(urb);
 301 }
 302
 303 static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
 304 {
 305         struct usb_device *udev = es2->usb_dev;
 306         struct urb *urb;
 307         struct usb_ctrlrequest *dr;
 308         u8 *buf;
 309         int retval;
 310
 311         urb = usb_alloc_urb(0, GFP_ATOMIC);
 312         if (!urb)
 313                 return -ENOMEM;
 314
 315         dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
 316         if (!dr) {
 317                 usb_free_urb(urb);
 318                 return -ENOMEM;
 319         }
 320
 321         buf = (u8 *)dr + sizeof(*dr);
 322         memcpy(buf, req, size);
 323
 324         dr->bRequest = cmd;
 325         dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
 326         dr->wValue = 0;
 327         dr->wIndex = 0;
 328         dr->wLength = cpu_to_le16(size);
 329
 330         usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
 331                              (unsigned char *)dr, buf, size,
 332                              ap_urb_complete, dr);
 333         retval = usb_submit_urb(urb, GFP_ATOMIC);
 334         if (retval) {
 335                 usb_free_urb(urb);
 336                 kfree(dr);
 337         }
 338         return retval;
 339 }
 340
 341 static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
 342                      bool async)
 343 {
 344         struct es2_ap_dev *es2 = hd_to_es2(hd);
 345
 346         if (async)
 347                 return output_async(es2, req, size, cmd);
 348
 349         return output_sync(es2, req, size, cmd);
 350 }
 351
 352 static int es2_cport_in_enable(struct es2_ap_dev *es2,
 353                                 struct es2_cport_in *cport_in)
 354 {
 355         struct urb *urb;
 356         int ret;
 357         int i;
 358
 359         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 360                 urb = cport_in->urb[i];
 361
 362                 ret = usb_submit_urb(urb, GFP_KERNEL);
 363                 if (ret) {
 364                         dev_err(&es2->usb_dev->dev,
 365                                         "failed to submit in-urb: %d\n", ret);
 366                         goto err_kill_urbs;
 367                 }
 368         }
 369
 370         return 0;
 371
 372 err_kill_urbs:
 373         for (--i; i >= 0; --i) {
 374                 urb = cport_in->urb[i];
 375                 usb_kill_urb(urb);
 376         }
 377
 378         return ret;
 379 }
 380
 381 static void es2_cport_in_disable(struct es2_ap_dev *es2,
 382                                 struct es2_cport_in *cport_in)
 383 {
 384         struct urb *urb;
 385         int i;
 386
 387         for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
 388                 urb = cport_in->urb[i];
 389                 usb_kill_urb(urb);
 390         }
 391 }
 392
 393 static int es2_arpc_in_enable(struct es2_ap_dev *es2)
 394 {
 395         struct urb *urb;
 396         int ret;
 397         int i;
 398
 399         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 400                 urb = es2->arpc_urb[i];
 401
 402                 ret = usb_submit_urb(urb, GFP_KERNEL);
 403                 if (ret) {
 404                         dev_err(&es2->usb_dev->dev,
 405                                 "failed to submit arpc in-urb: %d\n", ret);
 406                         goto err_kill_urbs;
 407                 }
 408         }
 409
 410         return 0;
 411
 412 err_kill_urbs:
 413         for (--i; i >= 0; --i) {
 414                 urb = es2->arpc_urb[i];
 415                 usb_kill_urb(urb);
 416         }
 417
 418         return ret;
 419 }
 420
 421 static void es2_arpc_in_disable(struct es2_ap_dev *es2)
 422 {
 423         struct urb *urb;
 424         int i;
 425
 426         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
 427                 urb = es2->arpc_urb[i];
 428                 usb_kill_urb(urb);
 429         }
 430 }
 431
 432 static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
 433 {
 434         struct urb *urb = NULL;
 435         unsigned long flags;
 436         int i;
 437
 438         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 439
 440         /* Look in our pool of allocated urbs first, as that's the "fastest" */
 441         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 442                 if (es2->cport_out_urb_busy[i] == false &&
 443                                 es2->cport_out_urb_cancelled[i] == false) {
 444                         es2->cport_out_urb_busy[i] = true;
 445                         urb = es2->cport_out_urb[i];
 446                         break;
 447                 }
 448         }
 449         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 450         if (urb)
 451                 return urb;
 452
 453         /*
 454          * Crap, pool is empty, complain to the syslog and go allocate one
 455          * dynamically as we have to succeed.
 456          */
 457         dev_dbg(&es2->usb_dev->dev,
 458                 "No free CPort OUT urbs, having to dynamically allocate one!\n");
 459         return usb_alloc_urb(0, gfp_mask);
 460 }
 461
 462 static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
 463 {
 464         unsigned long flags;
 465         int i;
 466         /*
 467          * See if this was an urb in our pool, if so mark it "free", otherwise
 468          * we need to free it ourselves.
 469          */
 470         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 471         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 472                 if (urb == es2->cport_out_urb[i]) {
 473                         es2->cport_out_urb_busy[i] = false;
 474                         urb = NULL;
 475                         break;
 476                 }
 477         }
 478         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 479
 480         /* If urb is not NULL, then we need to free this urb */
 481         usb_free_urb(urb);
 482 }
 483
 484 /*
 485  * We (ab)use the operation-message header pad bytes to transfer the
 486  * cport id in order to minimise overhead.
 487  */
 488 static void
 489 gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
 490 {
 491         header->pad[0] = cport_id;
 492 }
 493
 494 /* Clear the pad bytes used for the CPort id */
 495 static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
 496 {
 497         header->pad[0] = 0;
 498 }
 499
 500 /* Extract the CPort id packed into the header, and clear it */
 501 static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
 502 {
 503         u16 cport_id = header->pad[0];
 504
 505         gb_message_cport_clear(header);
 506
 507         return cport_id;
 508 }
 509
 510 /*
 511  * Returns zero if the message was successfully queued, or a negative errno
 512  * otherwise.
 513  */
 514 static int message_send(struct gb_host_device *hd, u16 cport_id,
 515                         struct gb_message *message, gfp_t gfp_mask)
 516 {
 517         struct es2_ap_dev *es2 = hd_to_es2(hd);
 518         struct usb_device *udev = es2->usb_dev;
 519         size_t buffer_size;
 520         int retval;
 521         struct urb *urb;
 522         int ep_pair;
 523         unsigned long flags;
 524
 525         /*
 526          * The data actually transferred will include an indication
 527          * of where the data should be sent.  Do one last check of
 528          * the target CPort id before filling it in.
 529          */
 530         if (!cport_id_valid(hd, cport_id)) {
 531                 dev_err(&udev->dev, "invalid cport %u\n", cport_id);
 532                 return -EINVAL;
 533         }
 534
 535         /* Find a free urb */
 536         urb = next_free_urb(es2, gfp_mask);
 537         if (!urb)
 538                 return -ENOMEM;
 539
 540         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 541         message->hcpriv = urb;
 542         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 543
 544         /* Pack the cport id into the message header */
 545         gb_message_cport_pack(message->header, cport_id);
 546
 547         buffer_size = sizeof(*message->header) + message->payload_size;
 548
 549         ep_pair = cport_to_ep_pair(es2, cport_id);
 550         usb_fill_bulk_urb(urb, udev,
 551                           usb_sndbulkpipe(udev,
 552                                           es2->cport_out[ep_pair].endpoint),
 553                           message->buffer, buffer_size,
 554                           cport_out_callback, message);
 555         urb->transfer_flags |= URB_ZERO_PACKET;
 556
 557         trace_gb_message_submit(message);
 558
 559         retval = usb_submit_urb(urb, gfp_mask);
 560         if (retval) {
 561                 dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
 562
 563                 spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
 564                 message->hcpriv = NULL;
 565                 spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
 566
 567                 free_urb(es2, urb);
 568                 gb_message_cport_clear(message->header);
 569
 570                 return retval;
 571         }
 572
 573         return 0;
 574 }
 575
 576 /*
 577  * Can not be called in atomic context.
 578  */
 579 static void message_cancel(struct gb_message *message)
 580 {
 581         struct gb_host_device *hd = message->operation->connection->hd;
 582         struct es2_ap_dev *es2 = hd_to_es2(hd);
 583         struct urb *urb;
 584         int i;
 585
 586         might_sleep();
 587
 588         spin_lock_irq(&es2->cport_out_urb_lock);
 589         urb = message->hcpriv;
 590
 591         /* Prevent dynamically allocated urb from being deallocated. */
 592         usb_get_urb(urb);
 593
 594         /* Prevent pre-allocated urb from being reused. */
 595         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
 596                 if (urb == es2->cport_out_urb[i]) {
 597                         es2->cport_out_urb_cancelled[i] = true;
 598                         break;
 599                 }
 600         }
 601         spin_unlock_irq(&es2->cport_out_urb_lock);
 602
 603         usb_kill_urb(urb);
 604
 605         if (i < NUM_CPORT_OUT_URB) {
 606                 spin_lock_irq(&es2->cport_out_urb_lock);
 607                 es2->cport_out_urb_cancelled[i] = false;
 608                 spin_unlock_irq(&es2->cport_out_urb_lock);
 609         }
 610
 611         usb_free_urb(urb);
 612 }
 613
 614 static int cport_reset(struct gb_host_device *hd, u16 cport_id)
 615 {
 616         struct es2_ap_dev *es2 = hd_to_es2(hd);
 617         struct usb_device *udev = es2->usb_dev;
 618         struct arpc_cport_reset_req req;
 619         int retval;
 620         int result;
 621
 622         switch (cport_id) {
 623         case GB_SVC_CPORT_ID:
 624         case ES2_CPORT_CDSI0:
 625         case ES2_CPORT_CDSI1:
 626                 return 0;
 627         }
 628
 629         req.cport_id = cpu_to_le16(cport_id);
 630         retval = arpc_sync(es2, ARPC_TYPE_CPORT_RESET, &req, sizeof(req),
 631                            &result, ES2_ARPC_CPORT_TIMEOUT);
 632         if (retval == -EREMOTEIO) {
 633                 dev_err(&udev->dev, "failed to reset cport %u: %d\n", cport_id,
 634                         result);
 635         }
 636
 637         return retval;
 638 }
 639
 640 static int es2_cport_allocate(struct gb_host_device *hd, int cport_id,
 641                                 unsigned long flags)
 642 {
 643         struct es2_ap_dev *es2 = hd_to_es2(hd);
 644         struct ida *id_map = &hd->cport_id_map;
 645         int ida_start, ida_end;
 646
 647         switch (cport_id) {
 648         case ES2_CPORT_CDSI0:
 649         case ES2_CPORT_CDSI1:
 650                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 651                 return -EBUSY;
 652         }
 653
 654         if (flags & GB_CONNECTION_FLAG_OFFLOADED &&
 655                         flags & GB_CONNECTION_FLAG_CDSI1) {
 656                 if (es2->cdsi1_in_use) {
 657                         dev_err(&hd->dev, "CDSI1 already in use\n");
 658                         return -EBUSY;
 659                 }
 660
 661                 es2->cdsi1_in_use = true;
 662
 663                 return ES2_CPORT_CDSI1;
 664         }
 665
 666         if (cport_id < 0) {
 667                 ida_start = 0;
 668                 ida_end = hd->num_cports;
 669         } else if (cport_id < hd->num_cports) {
 670                 ida_start = cport_id;
 671                 ida_end = cport_id + 1;
 672         } else {
 673                 dev_err(&hd->dev, "cport %d not available\n", cport_id);
 674                 return -EINVAL;
 675         }
 676
 677         return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
 678 }
 679
 680 static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
 681 {
 682         struct es2_ap_dev *es2 = hd_to_es2(hd);
 683
 684         switch (cport_id) {
 685         case ES2_CPORT_CDSI1:
 686                 es2->cdsi1_in_use = false;
 687                 return;
 688         }
 689
 690         ida_simple_remove(&hd->cport_id_map, cport_id);
 691 }
 692
 693 static int cport_enable(struct gb_host_device *hd, u16 cport_id,
 694                         unsigned long flags)
 695 {
 696         struct es2_ap_dev *es2 = hd_to_es2(hd);
 697         struct usb_device *udev = es2->usb_dev;
 698         struct gb_apb_request_cport_flags *req;
 699         u32 connection_flags;
 700         int ret;
 701
 702         req = kzalloc(sizeof(*req), GFP_KERNEL);
 703         if (!req)
 704                 return -ENOMEM;
 705
 706         connection_flags = 0;
 707         if (flags & GB_CONNECTION_FLAG_CONTROL)
 708                 connection_flags |= GB_APB_CPORT_FLAG_CONTROL;
 709         if (flags & GB_CONNECTION_FLAG_HIGH_PRIO)
 710                 connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO;
 711
 712         req->flags = cpu_to_le32(connection_flags);
 713
 714         dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__,
 715                         cport_id, connection_flags);
 716
 717         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 718                                 GB_APB_REQUEST_CPORT_FLAGS,
 719                                 USB_DIR_OUT | USB_TYPE_VENDOR |
 720                                 USB_RECIP_INTERFACE, cport_id, 0,
 721                                 req, sizeof(*req), ES2_USB_CTRL_TIMEOUT);
 722         if (ret != sizeof(*req)) {
 723                 dev_err(&udev->dev, "failed to set cport flags for port %d\n",
 724                                 cport_id);
 725                 if (ret >= 0)
 726                         ret = -EIO;
 727
 728                 goto out;
 729         }
 730
 731         ret = 0;
 732 out:
 733         kfree(req);
 734
 735         return ret;
 736 }
 737
 738 static int cport_disable(struct gb_host_device *hd, u16 cport_id)
 739 {
 740         int retval;
 741
 742         retval = cport_reset(hd, cport_id);
 743         if (retval)
 744                 return retval;
 745
 746         return 0;
 747 }
 748
 749 static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id)
 750 {
 751         struct es2_ap_dev *es2 = hd_to_es2(hd);
 752         struct device *dev = &es2->usb_dev->dev;
 753         struct arpc_cport_connected_req req;
 754         int ret;
 755
 756         req.cport_id = cpu_to_le16(cport_id);
 757         ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req),
 758                         NULL, ES2_ARPC_CPORT_TIMEOUT);
 759         if (ret) {
 760                 dev_err(dev, "failed to set connected state for cport %u: %d\n",
 761                                 cport_id, ret);
 762                 return ret;
 763         }
 764
 765         return 0;
 766 }
 767
 768 static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id,
 769                                 size_t peer_space, unsigned int timeout)
 770 {
 771         struct es2_ap_dev *es2 = hd_to_es2(hd);
 772         struct device *dev = &es2->usb_dev->dev;
 773         struct arpc_cport_quiesce_req req;
 774         int result;
 775         int ret;
 776
 777         if (peer_space > U16_MAX)
 778                 return -EINVAL;
 779
 780         if (timeout > U16_MAX)
 781                 return -EINVAL;
 782
 783         req.cport_id = cpu_to_le16(cport_id);
 784         req.peer_space = cpu_to_le16(peer_space);
 785         req.timeout = cpu_to_le16(timeout);
 786         ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req),
 787                         &result, ES2_ARPC_CPORT_TIMEOUT + timeout);
 788         if (ret) {
 789                 dev_err(dev, "failed to quiesce cport %u: %d (%d)\n",
 790                                 cport_id, ret, result);
 791                 return ret;
 792         }
 793
 794         return 0;
 795 }
 796
 797 static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id)
 798 {
 799         int retval;
 800         struct es2_ap_dev *es2 = hd_to_es2(hd);
 801         struct usb_device *udev = es2->usb_dev;
 802
 803         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 804                                  GB_APB_REQUEST_LATENCY_TAG_EN,
 805                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 806                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 807                                  0, ES2_USB_CTRL_TIMEOUT);
 808
 809         if (retval < 0)
 810                 dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n",
 811                         cport_id);
 812         return retval;
 813 }
 814
 815 static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
 816 {
 817         int retval;
 818         struct es2_ap_dev *es2 = hd_to_es2(hd);
 819         struct usb_device *udev = es2->usb_dev;
 820
 821         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 822                                  GB_APB_REQUEST_LATENCY_TAG_DIS,
 823                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 824                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 825                                  0, ES2_USB_CTRL_TIMEOUT);
 826
 827         if (retval < 0)
 828                 dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
 829                         cport_id);
 830         return retval;
 831 }
 832
 833 static int cport_features_enable(struct gb_host_device *hd, u16 cport_id)
 834 {
 835         int retval;
 836         struct es2_ap_dev *es2 = hd_to_es2(hd);
 837         struct usb_device *udev = es2->usb_dev;
 838
 839         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 840                                  GB_APB_REQUEST_CPORT_FEAT_EN,
 841                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 842                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 843                                  0, ES2_USB_CTRL_TIMEOUT);
 844         if (retval < 0)
 845                 dev_err(&udev->dev, "Cannot enable CPort features for cport %u: %d\n",
 846                         cport_id, retval);
 847         return retval;
 848 }
 849
 850 static int cport_features_disable(struct gb_host_device *hd, u16 cport_id)
 851 {
 852         int retval;
 853         struct es2_ap_dev *es2 = hd_to_es2(hd);
 854         struct usb_device *udev = es2->usb_dev;
 855
 856         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 857                                  GB_APB_REQUEST_CPORT_FEAT_DIS,
 858                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 859                                  USB_RECIP_INTERFACE, cport_id, 0, NULL,
 860                                  0, ES2_USB_CTRL_TIMEOUT);
 861         if (retval < 0)
 862                 dev_err(&udev->dev,
 863                         "Cannot disable CPort features for cport %u: %d\n",
 864                         cport_id, retval);
 865         return retval;
 866 }
 867
 868 static int timesync_enable(struct gb_host_device *hd, u8 count,
 869                            u64 frame_time, u32 strobe_delay, u32 refclk)
 870 {
 871         int retval;
 872         struct es2_ap_dev *es2 = hd_to_es2(hd);
 873         struct usb_device *udev = es2->usb_dev;
 874         struct gb_control_timesync_enable_request *request;
 875
 876         request = kzalloc(sizeof(*request), GFP_KERNEL);
 877         if (!request)
 878                 return -ENOMEM;
 879
 880         request->count = count;
 881         request->frame_time = cpu_to_le64(frame_time);
 882         request->strobe_delay = cpu_to_le32(strobe_delay);
 883         request->refclk = cpu_to_le32(refclk);
 884         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 885                                  GB_APB_REQUEST_TIMESYNC_ENABLE,
 886                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 887                                  USB_RECIP_INTERFACE, 0, 0, request,
 888                                  sizeof(*request), ES2_USB_CTRL_TIMEOUT);
 889         if (retval < 0)
 890                 dev_err(&udev->dev, "Cannot enable timesync %d\n", retval);
 891
 892         kfree(request);
 893         return retval;
 894 }
 895
 896 static int timesync_disable(struct gb_host_device *hd)
 897 {
 898         int retval;
 899         struct es2_ap_dev *es2 = hd_to_es2(hd);
 900         struct usb_device *udev = es2->usb_dev;
 901
 902         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 903                                  GB_APB_REQUEST_TIMESYNC_DISABLE,
 904                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 905                                  USB_RECIP_INTERFACE, 0, 0, NULL,
 906                                  0, ES2_USB_CTRL_TIMEOUT);
 907         if (retval < 0)
 908                 dev_err(&udev->dev, "Cannot disable timesync %d\n", retval);
 909
 910         return retval;
 911 }
 912
 913 static int timesync_authoritative(struct gb_host_device *hd, u64 *frame_time)
 914 {
 915         int retval, i;
 916         struct es2_ap_dev *es2 = hd_to_es2(hd);
 917         struct usb_device *udev = es2->usb_dev;
 918         struct timesync_authoritative_request *request;
 919
 920         request = kzalloc(sizeof(*request), GFP_KERNEL);
 921         if (!request)
 922                 return -ENOMEM;
 923
 924         for (i = 0; i < GB_TIMESYNC_MAX_STROBES; i++)
 925                 request->frame_time[i] = cpu_to_le64(frame_time[i]);
 926
 927         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 928                                  GB_APB_REQUEST_TIMESYNC_AUTHORITATIVE,
 929                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 930                                  USB_RECIP_INTERFACE, 0, 0, request,
 931                                  sizeof(*request), ES2_USB_CTRL_TIMEOUT);
 932         if (retval < 0)
 933                 dev_err(&udev->dev, "Cannot timesync authoritative out %d\n", retval);
 934
 935         kfree(request);
 936         return retval;
 937 }
 938
 939 static int timesync_get_last_event(struct gb_host_device *hd, u64 *frame_time)
 940 {
 941         int retval;
 942         struct es2_ap_dev *es2 = hd_to_es2(hd);
 943         struct usb_device *udev = es2->usb_dev;
 944         __le64 *response_frame_time;
 945
 946         response_frame_time = kzalloc(sizeof(*response_frame_time), GFP_KERNEL);
 947         if (!response_frame_time)
 948                 return -ENOMEM;
 949
 950         retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 951                                  GB_APB_REQUEST_TIMESYNC_GET_LAST_EVENT,
 952                                  USB_DIR_IN | USB_TYPE_VENDOR |
 953                                  USB_RECIP_INTERFACE, 0, 0, response_frame_time,
 954                                  sizeof(*response_frame_time),
 955                                  ES2_USB_CTRL_TIMEOUT);
 956
 957         if (retval != sizeof(*response_frame_time)) {
 958                 dev_err(&udev->dev, "Cannot get last TimeSync event: %d\n",
 959                         retval);
 960
 961                 if (retval >= 0)
 962                         retval = -EIO;
 963
 964                 goto out;
 965         }
 966         *frame_time = le64_to_cpu(*response_frame_time);
 967         retval = 0;
 968 out:
 969         kfree(response_frame_time);
 970         return retval;
 971 }
 972
 973 static struct gb_hd_driver es2_driver = {
 974         .hd_priv_size                   = sizeof(struct es2_ap_dev),
 975         .message_send                   = message_send,
 976         .message_cancel                 = message_cancel,
 977         .cport_allocate                 = es2_cport_allocate,
 978         .cport_release                  = es2_cport_release,
 979         .cport_enable                   = cport_enable,
 980         .cport_disable                  = cport_disable,
 981         .cport_connected                = es2_cport_connected,
 982         .cport_quiesce                  = es2_cport_quiesce,
 983         .latency_tag_enable             = latency_tag_enable,
 984         .latency_tag_disable            = latency_tag_disable,
 985         .output                         = output,
 986         .cport_features_enable          = cport_features_enable,
 987         .cport_features_disable         = cport_features_disable,
 988         .timesync_enable                = timesync_enable,
 989         .timesync_disable               = timesync_disable,
 990         .timesync_authoritative         = timesync_authoritative,
 991         .timesync_get_last_event        = timesync_get_last_event,
 992 };
 993
 994 /* Common function to report consistent warnings based on URB status */
 995 static int check_urb_status(struct urb *urb)
 996 {
 997         struct device *dev = &urb->dev->dev;
 998         int status = urb->status;
 999
1000         switch (status) {
1001         case 0:
1002                 return 0;
1003
1004         case -EOVERFLOW:
1005                 dev_err(dev, "%s: overflow actual length is %d\n",
1006                         __func__, urb->actual_length);
1007         case -ECONNRESET:
1008         case -ENOENT:
1009         case -ESHUTDOWN:
1010         case -EILSEQ:
1011         case -EPROTO:
1012                 /* device is gone, stop sending */
1013                 return status;
1014         }
1015         dev_err(dev, "%s: unknown status %d\n", __func__, status);
1016
1017         return -EAGAIN;
1018 }
1019
1020 static void es2_destroy(struct es2_ap_dev *es2)
1021 {
1022         struct usb_device *udev;
1023         int bulk_in;
1024         int i;
1025
1026         debugfs_remove(es2->apb_log_enable_dentry);
1027         usb_log_disable(es2);
1028
1029         /* Tear down everything! */
1030         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
1031                 struct urb *urb = es2->cport_out_urb[i];
1032
1033                 if (!urb)
1034                         break;
1035                 usb_kill_urb(urb);
1036                 usb_free_urb(urb);
1037                 es2->cport_out_urb[i] = NULL;
1038                 es2->cport_out_urb_busy[i] = false;     /* just to be anal */
1039         }
1040
1041         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
1042                 struct urb *urb = es2->arpc_urb[i];
1043
1044                 if (!urb)
1045                         break;
1046                 usb_free_urb(urb);
1047                 kfree(es2->arpc_buffer[i]);
1048                 es2->arpc_buffer[i] = NULL;
1049         }
1050
1051         for (bulk_in = 0; bulk_in < NUM_BULKS; bulk_in++) {
1052                 struct es2_cport_in *cport_in = &es2->cport_in[bulk_in];
1053
1054                 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
1055                         struct urb *urb = cport_in->urb[i];
1056
1057                         if (!urb)
1058                                 break;
1059                         usb_free_urb(urb);
1060                         kfree(cport_in->buffer[i]);
1061                         cport_in->buffer[i] = NULL;
1062                 }
1063         }
1064
1065         kfree(es2->cport_to_ep);
1066
1067         /* release reserved CDSI0 and CDSI1 cports */
1068         gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1);
1069         gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0);
1070
1071         udev = es2->usb_dev;
1072         gb_hd_put(es2->hd);
1073
1074         usb_put_dev(udev);
1075 }
1076
1077 static void cport_in_callback(struct urb *urb)
1078 {
1079         struct gb_host_device *hd = urb->context;
1080         struct device *dev = &urb->dev->dev;
1081         struct gb_operation_msg_hdr *header;
1082         int status = check_urb_status(urb);
1083         int retval;
1084         u16 cport_id;
1085
1086         if (status) {
1087                 if ((status == -EAGAIN) || (status == -EPROTO))
1088                         goto exit;
1089
1090                 /* The urb is being unlinked */
1091                 if (status == -ENOENT || status == -ESHUTDOWN)
1092                         return;
1093
1094                 dev_err(dev, "urb cport in error %d (dropped)\n", status);
1095                 return;
1096         }
1097
1098         if (urb->actual_length < sizeof(*header)) {
1099                 dev_err(dev, "short message received\n");
1100                 goto exit;
1101         }
1102
1103         /* Extract the CPort id, which is packed in the message header */
1104         header = urb->transfer_buffer;
1105         cport_id = gb_message_cport_unpack(header);
1106
1107         if (cport_id_valid(hd, cport_id)) {
1108                 greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
1109                                                         urb->actual_length);
1110         } else {
1111                 dev_err(dev, "invalid cport id %u received\n", cport_id);
1112         }
1113 exit:
1114         /* put our urb back in the request pool */
1115         retval = usb_submit_urb(urb, GFP_ATOMIC);
1116         if (retval)
1117                 dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
1118 }
1119
1120 static void cport_out_callback(struct urb *urb)
1121 {
1122         struct gb_message *message = urb->context;
1123         struct gb_host_device *hd = message->operation->connection->hd;
1124         struct es2_ap_dev *es2 = hd_to_es2(hd);
1125         int status = check_urb_status(urb);
1126         unsigned long flags;
1127
1128         gb_message_cport_clear(message->header);
1129
1130         spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
1131         message->hcpriv = NULL;
1132         spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
1133
1134         /*
1135          * Tell the submitter that the message send (attempt) is
1136          * complete, and report the status.
1137          */
1138         greybus_message_sent(hd, message, status);
1139
1140         free_urb(es2, urb);
1141 }
1142
1143 static struct arpc *arpc_alloc(void *payload, u16 size, u8 type)
1144 {
1145         struct arpc *rpc;
1146
1147         if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX)
1148                 return NULL;
1149
1150         rpc = kzalloc(sizeof(*rpc), GFP_KERNEL);
1151         if (!rpc)
1152                 return NULL;
1153
1154         INIT_LIST_HEAD(&rpc->list);
1155         rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL);
1156         if (!rpc->req)
1157                 goto err_free_rpc;
1158
1159         rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL);
1160         if (!rpc->resp)
1161                 goto err_free_req;
1162
1163         rpc->req->type = type;
1164         rpc->req->size = cpu_to_le16(sizeof(rpc->req) + size);
1165         memcpy(rpc->req->data, payload, size);
1166
1167         init_completion(&rpc->response_received);
1168
1169         return rpc;
1170
1171 err_free_req:
1172         kfree(rpc->req);
1173 err_free_rpc:
1174         kfree(rpc);
1175
1176         return NULL;
1177 }
1178
1179 static void arpc_free(struct arpc *rpc)
1180 {
1181         kfree(rpc->req);
1182         kfree(rpc->resp);
1183         kfree(rpc);
1184 }
1185
1186 static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id)
1187 {
1188         struct arpc *rpc;
1189
1190         list_for_each_entry(rpc, &es2->arpcs, list) {
1191                 if (rpc->req->id == id)
1192                         return rpc;
1193         }
1194
1195         return NULL;
1196 }
1197
1198 static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc)
1199 {
1200         rpc->active = true;
1201         rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++);
1202         list_add_tail(&rpc->list, &es2->arpcs);
1203 }
1204
1205 static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc)
1206 {
1207         if (rpc->active) {
1208                 rpc->active = false;
1209                 list_del(&rpc->list);
1210         }
1211 }
1212
1213 static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout)
1214 {
1215         struct usb_device *udev = es2->usb_dev;
1216         int retval;
1217
1218         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1219                                  GB_APB_REQUEST_ARPC_RUN,
1220                                  USB_DIR_OUT | USB_TYPE_VENDOR |
1221                                  USB_RECIP_INTERFACE,
1222                                  0, 0,
1223                                  rpc->req, le16_to_cpu(rpc->req->size),
1224                                  ES2_USB_CTRL_TIMEOUT);
1225         if (retval != le16_to_cpu(rpc->req->size)) {
1226                 dev_err(&udev->dev,
1227                         "failed to send ARPC request %d: %d\n",
1228                         rpc->req->type, retval);
1229                 if (retval > 0)
1230                         retval = -EIO;
1231                 return retval;
1232         }
1233
1234         return 0;
1235 }
1236
1237 static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload,
1238                      size_t size, int *result, unsigned int timeout)
1239 {
1240         struct arpc *rpc;
1241         unsigned long flags;
1242         int retval;
1243
1244         if (result)
1245                 *result = 0;
1246
1247         rpc = arpc_alloc(payload, size, type);
1248         if (!rpc)
1249                 return -ENOMEM;
1250
1251         spin_lock_irqsave(&es2->arpc_lock, flags);
1252         arpc_add(es2, rpc);
1253         spin_unlock_irqrestore(&es2->arpc_lock, flags);
1254
1255         retval = arpc_send(es2, rpc, timeout);
1256         if (retval)
1257                 goto out_arpc_del;
1258
1259         retval = wait_for_completion_interruptible_timeout(
1260                                                 &rpc->response_received,
1261                                                 msecs_to_jiffies(timeout));
1262         if (retval <= 0) {
1263                 if (!retval)
1264                         retval = -ETIMEDOUT;
1265                 goto out_arpc_del;
1266         }
1267
1268         if (rpc->resp->result) {
1269                 retval = -EREMOTEIO;
1270                 if (result)
1271                         *result = rpc->resp->result;
1272         } else {
1273                 retval = 0;
1274         }
1275
1276 out_arpc_del:
1277         spin_lock_irqsave(&es2->arpc_lock, flags);
1278         arpc_del(es2, rpc);
1279         spin_unlock_irqrestore(&es2->arpc_lock, flags);
1280         arpc_free(rpc);
1281
1282         if (retval < 0 && retval != -EREMOTEIO) {
1283                 dev_err(&es2->usb_dev->dev,
1284                         "failed to execute ARPC: %d\n", retval);
1285         }
1286
1287         return retval;
1288 }
1289
1290 static void arpc_in_callback(struct urb *urb)
1291 {
1292         struct es2_ap_dev *es2 = urb->context;
1293         struct device *dev = &urb->dev->dev;
1294         int status = check_urb_status(urb);
1295         struct arpc *rpc;
1296         struct arpc_response_message *resp;
1297         unsigned long flags;
1298         int retval;
1299
1300         if (status) {
1301                 if ((status == -EAGAIN) || (status == -EPROTO))
1302                         goto exit;
1303
1304                 /* The urb is being unlinked */
1305                 if (status == -ENOENT || status == -ESHUTDOWN)
1306                         return;
1307
1308                 dev_err(dev, "arpc in-urb error %d (dropped)\n", status);
1309                 return;
1310         }
1311
1312         if (urb->actual_length < sizeof(*resp)) {
1313                 dev_err(dev, "short aprc response received\n");
1314                 goto exit;
1315         }
1316
1317         resp = urb->transfer_buffer;
1318         spin_lock_irqsave(&es2->arpc_lock, flags);
1319         rpc = arpc_find(es2, resp->id);
1320         if (!rpc) {
1321                 dev_err(dev, "invalid arpc response id received: %u\n",
1322                         le16_to_cpu(resp->id));
1323                 spin_unlock_irqrestore(&es2->arpc_lock, flags);
1324                 goto exit;
1325         }
1326
1327         arpc_del(es2, rpc);
1328         memcpy(rpc->resp, resp, sizeof(*resp));
1329         complete(&rpc->response_received);
1330         spin_unlock_irqrestore(&es2->arpc_lock, flags);
1331
1332 exit:
1333         /* put our urb back in the request pool */
1334         retval = usb_submit_urb(urb, GFP_ATOMIC);
1335         if (retval)
1336                 dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval);
1337 }
1338
1339 #define APB1_LOG_MSG_SIZE       64
1340 static void apb_log_get(struct es2_ap_dev *es2, char *buf)
1341 {
1342         int retval;
1343
1344         do {
1345                 retval = usb_control_msg(es2->usb_dev,
1346                                         usb_rcvctrlpipe(es2->usb_dev, 0),
1347                                         GB_APB_REQUEST_LOG,
1348                                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1349                                         0x00, 0x00,
1350                                         buf,
1351                                         APB1_LOG_MSG_SIZE,
1352                                         ES2_USB_CTRL_TIMEOUT);
1353                 if (retval > 0)
1354                         kfifo_in(&es2->apb_log_fifo, buf, retval);
1355         } while (retval > 0);
1356 }
1357
1358 static int apb_log_poll(void *data)
1359 {
1360         struct es2_ap_dev *es2 = data;
1361         char *buf;
1362
1363         buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
1364         if (!buf)
1365                 return -ENOMEM;
1366
1367         while (!kthread_should_stop()) {
1368                 msleep(1000);
1369                 apb_log_get(es2, buf);
1370         }
1371
1372         kfree(buf);
1373
1374         return 0;
1375 }
1376
1377 static ssize_t apb_log_read(struct file *f, char __user *buf,
1378                                 size_t count, loff_t *ppos)
1379 {
1380         struct es2_ap_dev *es2 = f->f_inode->i_private;
1381         ssize_t ret;
1382         size_t copied;
1383         char *tmp_buf;
1384
1385         if (count > APB1_LOG_SIZE)
1386                 count = APB1_LOG_SIZE;
1387
1388         tmp_buf = kmalloc(count, GFP_KERNEL);
1389         if (!tmp_buf)
1390                 return -ENOMEM;
1391
1392         copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count);
1393         ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
1394
1395         kfree(tmp_buf);
1396
1397         return ret;
1398 }
1399
1400 static const struct file_operations apb_log_fops = {
1401         .read   = apb_log_read,
1402 };
1403
1404 static void usb_log_enable(struct es2_ap_dev *es2)
1405 {
1406         if (!IS_ERR_OR_NULL(es2->apb_log_task))
1407                 return;
1408
1409         /* get log from APB1 */
1410         es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log");
1411         if (IS_ERR(es2->apb_log_task))
1412                 return;
1413         /* XXX We will need to rename this per APB */
1414         es2->apb_log_dentry = debugfs_create_file("apb_log", S_IRUGO,
1415                                                 gb_debugfs_get(), es2,
1416                                                 &apb_log_fops);
1417 }
1418
1419 static void usb_log_disable(struct es2_ap_dev *es2)
1420 {
1421         if (IS_ERR_OR_NULL(es2->apb_log_task))
1422                 return;
1423
1424         debugfs_remove(es2->apb_log_dentry);
1425         es2->apb_log_dentry = NULL;
1426
1427         kthread_stop(es2->apb_log_task);
1428         es2->apb_log_task = NULL;
1429 }
1430
1431 static ssize_t apb_log_enable_read(struct file *f, char __user *buf,
1432                                 size_t count, loff_t *ppos)
1433 {
1434         struct es2_ap_dev *es2 = f->f_inode->i_private;
1435         int enable = !IS_ERR_OR_NULL(es2->apb_log_task);
1436         char tmp_buf[3];
1437
1438         sprintf(tmp_buf, "%d\n", enable);
1439         return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
1440 }
1441
1442 static ssize_t apb_log_enable_write(struct file *f, const char __user *buf,
1443                                 size_t count, loff_t *ppos)
1444 {
1445         int enable;
1446         ssize_t retval;
1447         struct es2_ap_dev *es2 = f->f_inode->i_private;
1448
1449         retval = kstrtoint_from_user(buf, count, 10, &enable);
1450         if (retval)
1451                 return retval;
1452
1453         if (enable)
1454                 usb_log_enable(es2);
1455         else
1456                 usb_log_disable(es2);
1457
1458         return count;
1459 }
1460
1461 static const struct file_operations apb_log_enable_fops = {
1462         .read   = apb_log_enable_read,
1463         .write  = apb_log_enable_write,
1464 };
1465
1466 static int apb_get_cport_count(struct usb_device *udev)
1467 {
1468         int retval;
1469         __le16 *cport_count;
1470
1471         cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL);
1472         if (!cport_count)
1473                 return -ENOMEM;
1474
1475         retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
1476                                  GB_APB_REQUEST_CPORT_COUNT,
1477                                  USB_DIR_IN | USB_TYPE_VENDOR |
1478                                  USB_RECIP_INTERFACE, 0, 0, cport_count,
1479                                  sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT);
1480         if (retval != sizeof(*cport_count)) {
1481                 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1482                         retval);
1483
1484                 if (retval >= 0)
1485                         retval = -EIO;
1486
1487                 goto out;
1488         }
1489
1490         retval = le16_to_cpu(*cport_count);
1491
1492         /* We need to fit a CPort ID in one byte of a message header */
1493         if (retval > U8_MAX) {
1494                 retval = U8_MAX;
1495                 dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n");
1496         }
1497
1498 out:
1499         kfree(cport_count);
1500         return retval;
1501 }
1502
1503 /*
1504  * The ES2 USB Bridge device has 15 endpoints
1505  * 1 Control - usual USB stuff + AP -> APBridgeA messages
1506  * 7 Bulk IN - CPort data in
1507  * 7 Bulk OUT - CPort data out
1508  */
1509 static int ap_probe(struct usb_interface *interface,
1510                     const struct usb_device_id *id)
1511 {
1512         struct es2_ap_dev *es2;
1513         struct gb_host_device *hd;
1514         struct usb_device *udev;
1515         struct usb_host_interface *iface_desc;
1516         struct usb_endpoint_descriptor *endpoint;
1517         int bulk_in = 0;
1518         int bulk_out = 0;
1519         int retval;
1520         int i;
1521         int num_cports;
1522
1523         udev = usb_get_dev(interface_to_usbdev(interface));
1524
1525         num_cports = apb_get_cport_count(udev);
1526         if (num_cports < 0) {
1527                 usb_put_dev(udev);
1528                 dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
1529                         num_cports);
1530                 return num_cports;
1531         }
1532
1533         hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX,
1534                                 num_cports);
1535         if (IS_ERR(hd)) {
1536                 usb_put_dev(udev);
1537                 return PTR_ERR(hd);
1538         }
1539
1540         es2 = hd_to_es2(hd);
1541         es2->hd = hd;
1542         es2->usb_intf = interface;
1543         es2->usb_dev = udev;
1544         spin_lock_init(&es2->cport_out_urb_lock);
1545         INIT_KFIFO(es2->apb_log_fifo);
1546         usb_set_intfdata(interface, es2);
1547
1548         /*
1549          * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated
1550          * dynamically.
1551          */
1552         retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0);
1553         if (retval)
1554                 goto error;
1555         retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1);
1556         if (retval)
1557                 goto error;
1558
1559         es2->cport_to_ep = kcalloc(hd->num_cports, sizeof(*es2->cport_to_ep),
1560                                    GFP_KERNEL);
1561         if (!es2->cport_to_ep) {
1562                 retval = -ENOMEM;
1563                 goto error;
1564         }
1565
1566         /* find all bulk endpoints */
1567         iface_desc = interface->cur_altsetting;
1568         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1569                 endpoint = &iface_desc->endpoint[i].desc;
1570
1571                 if (usb_endpoint_is_bulk_in(endpoint)) {
1572                         if (bulk_in < NUM_BULKS)
1573                                 es2->cport_in[bulk_in].endpoint =
1574                                         endpoint->bEndpointAddress;
1575                         else
1576                                 es2->arpc_endpoint_in =
1577                                         endpoint->bEndpointAddress;
1578                         bulk_in++;
1579                 } else if (usb_endpoint_is_bulk_out(endpoint)) {
1580                         es2->cport_out[bulk_out++].endpoint =
1581                                 endpoint->bEndpointAddress;
1582                 } else {
1583                         dev_err(&udev->dev,
1584                                 "Unknown endpoint type found, address 0x%02x\n",
1585                                 endpoint->bEndpointAddress);
1586                 }
1587         }
1588         if (bulk_in != NUM_BULKS_IN || bulk_out != NUM_BULKS_OUT) {
1589                 dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
1590                 retval = -ENODEV;
1591                 goto error;
1592         }
1593
1594         /* Allocate buffers for our cport in messages */
1595         for (bulk_in = 0; bulk_in < NUM_BULKS; bulk_in++) {
1596                 struct es2_cport_in *cport_in = &es2->cport_in[bulk_in];
1597
1598                 for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
1599                         struct urb *urb;
1600                         u8 *buffer;
1601
1602                         urb = usb_alloc_urb(0, GFP_KERNEL);
1603                         if (!urb) {
1604                                 retval = -ENOMEM;
1605                                 goto error;
1606                         }
1607                         buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
1608                         if (!buffer) {
1609                                 retval = -ENOMEM;
1610                                 goto error;
1611                         }
1612
1613                         usb_fill_bulk_urb(urb, udev,
1614                                           usb_rcvbulkpipe(udev,
1615                                                           cport_in->endpoint),
1616                                           buffer, ES2_GBUF_MSG_SIZE_MAX,
1617                                           cport_in_callback, hd);
1618                         cport_in->urb[i] = urb;
1619                         cport_in->buffer[i] = buffer;
1620                 }
1621         }
1622
1623         /* Allocate buffers for ARPC in messages */
1624         for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
1625                 struct urb *urb;
1626                 u8 *buffer;
1627
1628                 urb = usb_alloc_urb(0, GFP_KERNEL);
1629                 if (!urb) {
1630                         retval = -ENOMEM;
1631                         goto error;
1632                 }
1633                 buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL);
1634                 if (!buffer) {
1635                         retval = -ENOMEM;
1636                         goto error;
1637                 }
1638
1639                 usb_fill_bulk_urb(urb, udev,
1640                                   usb_rcvbulkpipe(udev,
1641                                                   es2->arpc_endpoint_in),
1642                                   buffer, ARPC_IN_SIZE_MAX,
1643                                   arpc_in_callback, es2);
1644
1645                 es2->arpc_urb[i] = urb;
1646                 es2->arpc_buffer[i] = buffer;
1647         }
1648
1649         /* Allocate urbs for our CPort OUT messages */
1650         for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
1651                 struct urb *urb;
1652
1653                 urb = usb_alloc_urb(0, GFP_KERNEL);
1654                 if (!urb) {
1655                         retval = -ENOMEM;
1656                         goto error;
1657                 }
1658
1659                 es2->cport_out_urb[i] = urb;
1660                 es2->cport_out_urb_busy[i] = false;     /* just to be anal */
1661         }
1662
1663         /* XXX We will need to rename this per APB */
1664         es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable",
1665                                                         (S_IWUSR | S_IRUGO),
1666                                                         gb_debugfs_get(), es2,
1667                                                         &apb_log_enable_fops);
1668
1669         INIT_LIST_HEAD(&es2->arpcs);
1670         spin_lock_init(&es2->arpc_lock);
1671
1672         if (es2_arpc_in_enable(es2))
1673                 goto error;
1674
1675         retval = gb_hd_add(hd);
1676         if (retval)
1677                 goto err_disable_arpc_in;
1678
1679         for (i = 0; i < NUM_BULKS; ++i) {
1680                 retval = es2_cport_in_enable(es2, &es2->cport_in[i]);
1681                 if (retval)
1682                         goto err_disable_cport_in;
1683         }
1684
1685         return 0;
1686
1687 err_disable_cport_in:
1688         for (--i; i >= 0; --i)
1689                 es2_cport_in_disable(es2, &es2->cport_in[i]);
1690         gb_hd_del(hd);
1691 err_disable_arpc_in:
1692         es2_arpc_in_disable(es2);
1693 error:
1694         es2_destroy(es2);
1695
1696         return retval;
1697 }
1698
1699 static void ap_disconnect(struct usb_interface *interface)
1700 {
1701         struct es2_ap_dev *es2 = usb_get_intfdata(interface);
1702         int i;
1703
1704         gb_hd_del(es2->hd);
1705
1706         for (i = 0; i < NUM_BULKS; ++i)
1707                 es2_cport_in_disable(es2, &es2->cport_in[i]);
1708         es2_arpc_in_disable(es2);
1709
1710         es2_destroy(es2);
1711 }
1712
1713 static struct usb_driver es2_ap_driver = {
1714         .name =         "es2_ap_driver",
1715         .probe =        ap_probe,
1716         .disconnect =   ap_disconnect,
1717         .id_table =     id_table,
1718         .soft_unbind =  1,
1719 };
1720
1721 module_usb_driver(es2_ap_driver);
1722
1723 MODULE_LICENSE("GPL v2");
1724 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");