drivers/staging/most/hdm-usb/hdm_usb.c

   1 /*
   2  * hdm_usb.c - Hardware dependent module for USB
   3  *
   4  * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * This file is licensed under GPLv2.
  12  */
  13
  14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15 #include <linux/module.h>
  16 #include <linux/fs.h>
  17 #include <linux/usb.h>
  18 #include <linux/slab.h>
  19 #include <linux/init.h>
  20 #include <linux/cdev.h>
  21 #include <linux/device.h>
  22 #include <linux/list.h>
  23 #include <linux/completion.h>
  24 #include <linux/mutex.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/workqueue.h>
  28 #include <linux/sysfs.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/uaccess.h>
  32 #include "mostcore.h"
  33 #include "networking.h"
  34
  35 #define USB_MTU                 512
  36 #define NO_ISOCHRONOUS_URB      0
  37 #define AV_PACKETS_PER_XACT     2
  38 #define BUF_CHAIN_SIZE          0xFFFF
  39 #define MAX_NUM_ENDPOINTS       30
  40 #define MAX_SUFFIX_LEN          10
  41 #define MAX_STRING_LEN          80
  42 #define MAX_BUF_SIZE            0xFFFF
  43
  44 #define USB_VENDOR_ID_SMSC      0x0424  /* VID: SMSC */
  45 #define USB_DEV_ID_BRDG         0xC001  /* PID: USB Bridge */
  46 #define USB_DEV_ID_OS81118      0xCF18  /* PID: USB OS81118 */
  47 #define USB_DEV_ID_OS81119      0xCF19  /* PID: USB OS81119 */
  48 #define USB_DEV_ID_OS81210      0xCF30  /* PID: USB OS81210 */
  49 /* DRCI Addresses */
  50 #define DRCI_REG_NI_STATE       0x0100
  51 #define DRCI_REG_PACKET_BW      0x0101
  52 #define DRCI_REG_NODE_ADDR      0x0102
  53 #define DRCI_REG_NODE_POS       0x0103
  54 #define DRCI_REG_MEP_FILTER     0x0140
  55 #define DRCI_REG_HASH_TBL0      0x0141
  56 #define DRCI_REG_HASH_TBL1      0x0142
  57 #define DRCI_REG_HASH_TBL2      0x0143
  58 #define DRCI_REG_HASH_TBL3      0x0144
  59 #define DRCI_REG_HW_ADDR_HI     0x0145
  60 #define DRCI_REG_HW_ADDR_MI     0x0146
  61 #define DRCI_REG_HW_ADDR_LO     0x0147
  62 #define DRCI_REG_BASE           0x1100
  63 #define DRCI_COMMAND            0x02
  64 #define DRCI_READ_REQ           0xA0
  65 #define DRCI_WRITE_REQ          0xA1
  66
  67 /**
  68  * struct most_dci_obj - Direct Communication Interface
  69  * @kobj:position in sysfs
  70  * @usb_device: pointer to the usb device
  71  * @reg_addr: register address for arbitrary DCI access
  72  */
  73 struct most_dci_obj {
  74         struct kobject kobj;
  75         struct usb_device *usb_device;
  76         u16 reg_addr;
  77 };
  78
  79 #define to_dci_obj(p) container_of(p, struct most_dci_obj, kobj)
  80
  81 struct most_dev;
  82
  83 struct clear_hold_work {
  84         struct work_struct ws;
  85         struct most_dev *mdev;
  86         unsigned int channel;
  87         int pipe;
  88 };
  89
  90 #define to_clear_hold_work(w) container_of(w, struct clear_hold_work, ws)
  91
  92 /**
  93  * struct most_dev - holds all usb interface specific stuff
  94  * @parent: parent object in sysfs
  95  * @usb_device: pointer to usb device
  96  * @iface: hardware interface
  97  * @cap: channel capabilities
  98  * @conf: channel configuration
  99  * @dci: direct communication interface of hardware
 100  * @hw_addr: MAC address of hardware
 101  * @ep_address: endpoint address table
 102  * @link_stat: link status of hardware
 103  * @description: device description
 104  * @suffix: suffix for channel name
 105  * @channel_lock: synchronize channel access
 106  * @padding_active: indicates channel uses padding
 107  * @is_channel_healthy: health status table of each channel
 108  * @busy_urbs: list of anchored items
 109  * @io_mutex: synchronize I/O with disconnect
 110  * @link_stat_timer: timer for link status reports
 111  * @poll_work_obj: work for polling link status
 112  */
 113 struct most_dev {
 114         struct kobject *parent;
 115         struct usb_device *usb_device;
 116         struct most_interface iface;
 117         struct most_channel_capability *cap;
 118         struct most_channel_config *conf;
 119         struct most_dci_obj *dci;
 120         u8 hw_addr[6];
 121         u8 *ep_address;
 122         u16 link_stat;
 123         char description[MAX_STRING_LEN];
 124         char suffix[MAX_NUM_ENDPOINTS][MAX_SUFFIX_LEN];
 125         spinlock_t channel_lock[MAX_NUM_ENDPOINTS]; /* sync channel access */
 126         bool padding_active[MAX_NUM_ENDPOINTS];
 127         bool is_channel_healthy[MAX_NUM_ENDPOINTS];
 128         struct clear_hold_work clear_work[MAX_NUM_ENDPOINTS];
 129         struct usb_anchor *busy_urbs;
 130         struct mutex io_mutex;
 131         struct timer_list link_stat_timer;
 132         struct work_struct poll_work_obj;
 133 };
 134
 135 #define to_mdev(d) container_of(d, struct most_dev, iface)
 136 #define to_mdev_from_work(w) container_of(w, struct most_dev, poll_work_obj)
 137
 138 static void wq_clear_halt(struct work_struct *wq_obj);
 139 static void wq_netinfo(struct work_struct *wq_obj);
 140
 141 /**
 142  * drci_rd_reg - read a DCI register
 143  * @dev: usb device
 144  * @reg: register address
 145  * @buf: buffer to store data
 146  *
 147  * This is reads data from INIC's direct register communication interface
 148  */
 149 static inline int drci_rd_reg(struct usb_device *dev, u16 reg, u16 *buf)
 150 {
 151         int retval;
 152         u16 *dma_buf = kzalloc(sizeof(u16), GFP_KERNEL);
 153         u8 req_type = USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
 154
 155         if (!dma_buf)
 156                 return -ENOMEM;
 157
 158         retval = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 159                                  DRCI_READ_REQ, req_type,
 160                                  0x0000,
 161                                  reg, dma_buf, sizeof(u16), 5 * HZ);
 162         *buf = le16_to_cpu(*dma_buf);
 163         kfree(dma_buf);
 164
 165         return retval;
 166 }
 167
 168 /**
 169  * drci_wr_reg - write a DCI register
 170  * @dev: usb device
 171  * @reg: register address
 172  * @data: data to write
 173  *
 174  * This is writes data to INIC's direct register communication interface
 175  */
 176 static inline int drci_wr_reg(struct usb_device *dev, u16 reg, u16 data)
 177 {
 178         return usb_control_msg(dev,
 179                                usb_sndctrlpipe(dev, 0),
 180                                DRCI_WRITE_REQ,
 181                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 182                                data,
 183                                reg,
 184                                NULL,
 185                                0,
 186                                5 * HZ);
 187 }
 188
 189 /**
 190  * free_anchored_buffers - free device's anchored items
 191  * @mdev: the device
 192  * @channel: channel ID
 193  * @status: status of MBO termination
 194  */
 195 static void free_anchored_buffers(struct most_dev *mdev, unsigned int channel,
 196                                   enum mbo_status_flags status)
 197 {
 198         struct mbo *mbo;
 199         struct urb *urb;
 200
 201         while ((urb = usb_get_from_anchor(&mdev->busy_urbs[channel]))) {
 202                 mbo = urb->context;
 203                 usb_kill_urb(urb);
 204                 if (mbo && mbo->complete) {
 205                         mbo->status = status;
 206                         mbo->processed_length = 0;
 207                         mbo->complete(mbo);
 208                 }
 209                 usb_free_urb(urb);
 210         }
 211 }
 212
 213 /**
 214  * get_stream_frame_size - calculate frame size of current configuration
 215  * @cfg: channel configuration
 216  */
 217 static unsigned int get_stream_frame_size(struct most_channel_config *cfg)
 218 {
 219         unsigned int frame_size = 0;
 220         unsigned int sub_size = cfg->subbuffer_size;
 221
 222         if (!sub_size) {
 223                 pr_warn("Misconfig: Subbuffer size zero.\n");
 224                 return frame_size;
 225         }
 226         switch (cfg->data_type) {
 227         case MOST_CH_ISOC:
 228                 frame_size = AV_PACKETS_PER_XACT * sub_size;
 229                 break;
 230         case MOST_CH_SYNC:
 231                 if (cfg->packets_per_xact == 0) {
 232                         pr_warn("Misconfig: Packets per XACT zero\n");
 233                         frame_size = 0;
 234                 } else if (cfg->packets_per_xact == 0xFF) {
 235                         frame_size = (USB_MTU / sub_size) * sub_size;
 236                 } else {
 237                         frame_size = cfg->packets_per_xact * sub_size;
 238                 }
 239                 break;
 240         default:
 241                 pr_warn("Query frame size of non-streaming channel\n");
 242                 break;
 243         }
 244         return frame_size;
 245 }
 246
 247 /**
 248  * hdm_poison_channel - mark buffers of this channel as invalid
 249  * @iface: pointer to the interface
 250  * @channel: channel ID
 251  *
 252  * This unlinks all URBs submitted to the HCD,
 253  * calls the associated completion function of the core and removes
 254  * them from the list.
 255  *
 256  * Returns 0 on success or error code otherwise.
 257  */
 258 static int hdm_poison_channel(struct most_interface *iface, int channel)
 259 {
 260         struct most_dev *mdev = to_mdev(iface);
 261         unsigned long flags;
 262         spinlock_t *lock; /* temp. lock */
 263
 264         if (unlikely(!iface)) {
 265                 dev_warn(&mdev->usb_device->dev, "Poison: Bad interface.\n");
 266                 return -EIO;
 267         }
 268         if (unlikely(channel < 0 || channel >= iface->num_channels)) {
 269                 dev_warn(&mdev->usb_device->dev, "Channel ID out of range.\n");
 270                 return -ECHRNG;
 271         }
 272
 273         lock = mdev->channel_lock + channel;
 274         spin_lock_irqsave(lock, flags);
 275         mdev->is_channel_healthy[channel] = false;
 276         spin_unlock_irqrestore(lock, flags);
 277
 278         cancel_work_sync(&mdev->clear_work[channel].ws);
 279
 280         mutex_lock(&mdev->io_mutex);
 281         free_anchored_buffers(mdev, channel, MBO_E_CLOSE);
 282         if (mdev->padding_active[channel])
 283                 mdev->padding_active[channel] = false;
 284
 285         if (mdev->conf[channel].data_type == MOST_CH_ASYNC) {
 286                 del_timer_sync(&mdev->link_stat_timer);
 287                 cancel_work_sync(&mdev->poll_work_obj);
 288         }
 289         mutex_unlock(&mdev->io_mutex);
 290         return 0;
 291 }
 292
 293 /**
 294  * hdm_add_padding - add padding bytes
 295  * @mdev: most device
 296  * @channel: channel ID
 297  * @mbo: buffer object
 298  *
 299  * This inserts the INIC hardware specific padding bytes into a streaming
 300  * channel's buffer
 301  */
 302 static int hdm_add_padding(struct most_dev *mdev, int channel, struct mbo *mbo)
 303 {
 304         struct most_channel_config *conf = &mdev->conf[channel];
 305         unsigned int frame_size = get_stream_frame_size(conf);
 306         unsigned int j, num_frames;
 307         u16 rd_addr, wr_addr;
 308
 309         if (!frame_size)
 310                 return -EIO;
 311         num_frames = mbo->buffer_length / frame_size;
 312
 313         if (num_frames < 1) {
 314                 dev_err(&mdev->usb_device->dev,
 315                         "Missed minimal transfer unit.\n");
 316                 return -EIO;
 317         }
 318
 319         for (j = 1; j < num_frames; j++) {
 320                 wr_addr = (num_frames - j) * USB_MTU;
 321                 rd_addr = (num_frames - j) * frame_size;
 322                 memmove(mbo->virt_address + wr_addr,
 323                         mbo->virt_address + rd_addr,
 324                         frame_size);
 325         }
 326         mbo->buffer_length = num_frames * USB_MTU;
 327         return 0;
 328 }
 329
 330 /**
 331  * hdm_remove_padding - remove padding bytes
 332  * @mdev: most device
 333  * @channel: channel ID
 334  * @mbo: buffer object
 335  *
 336  * This takes the INIC hardware specific padding bytes off a streaming
 337  * channel's buffer.
 338  */
 339 static int hdm_remove_padding(struct most_dev *mdev, int channel,
 340                               struct mbo *mbo)
 341 {
 342         struct most_channel_config *const conf = &mdev->conf[channel];
 343         unsigned int frame_size = get_stream_frame_size(conf);
 344         unsigned int j, num_frames;
 345
 346         if (!frame_size)
 347                 return -EIO;
 348         num_frames = mbo->processed_length / USB_MTU;
 349
 350         for (j = 1; j < num_frames; j++)
 351                 memmove(mbo->virt_address + frame_size * j,
 352                         mbo->virt_address + USB_MTU * j,
 353                         frame_size);
 354
 355         mbo->processed_length = frame_size * num_frames;
 356         return 0;
 357 }
 358
 359 /**
 360  * hdm_write_completion - completion function for submitted Tx URBs
 361  * @urb: the URB that has been completed
 362  *
 363  * This checks the status of the completed URB. In case the URB has been
 364  * unlinked before, it is immediately freed. On any other error the MBO
 365  * transfer flag is set. On success it frees allocated resources and calls
 366  * the completion function.
 367  *
 368  * Context: interrupt!
 369  */
 370 static void hdm_write_completion(struct urb *urb)
 371 {
 372         struct mbo *mbo = urb->context;
 373         struct most_dev *mdev = to_mdev(mbo->ifp);
 374         unsigned int channel = mbo->hdm_channel_id;
 375         struct device *dev = &mdev->usb_device->dev;
 376         spinlock_t *lock = mdev->channel_lock + channel;
 377         unsigned long flags;
 378
 379         spin_lock_irqsave(lock, flags);
 380         if (urb->status == -ENOENT || urb->status == -ECONNRESET ||
 381             !mdev->is_channel_healthy[channel]) {
 382                 spin_unlock_irqrestore(lock, flags);
 383                 return;
 384         }
 385
 386         if (unlikely(urb->status && urb->status != -ESHUTDOWN)) {
 387                 mbo->processed_length = 0;
 388                 switch (urb->status) {
 389                 case -EPIPE:
 390                         dev_warn(dev, "Broken OUT pipe detected\n");
 391                         mdev->is_channel_healthy[channel] = false;
 392                         spin_unlock_irqrestore(lock, flags);
 393                         mdev->clear_work[channel].pipe = urb->pipe;
 394                         schedule_work(&mdev->clear_work[channel].ws);
 395                         return;
 396                 case -ENODEV:
 397                 case -EPROTO:
 398                         mbo->status = MBO_E_CLOSE;
 399                         break;
 400                 default:
 401                         mbo->status = MBO_E_INVAL;
 402                         break;
 403                 }
 404         } else {
 405                 mbo->status = MBO_SUCCESS;
 406                 mbo->processed_length = urb->actual_length;
 407         }
 408
 409         spin_unlock_irqrestore(lock, flags);
 410
 411         if (likely(mbo->complete))
 412                 mbo->complete(mbo);
 413         usb_free_urb(urb);
 414 }
 415
 416 /**
 417  * hdm_read_completion - completion function for submitted Rx URBs
 418  * @urb: the URB that has been completed
 419  *
 420  * This checks the status of the completed URB. In case the URB has been
 421  * unlinked before it is immediately freed. On any other error the MBO transfer
 422  * flag is set. On success it frees allocated resources, removes
 423  * padding bytes -if necessary- and calls the completion function.
 424  *
 425  * Context: interrupt!
 426  *
 427  * **************************************************************************
 428  *                   Error codes returned by in urb->status
 429  *                   or in iso_frame_desc[n].status (for ISO)
 430  * *************************************************************************
 431  *
 432  * USB device drivers may only test urb status values in completion handlers.
 433  * This is because otherwise there would be a race between HCDs updating
 434  * these values on one CPU, and device drivers testing them on another CPU.
 435  *
 436  * A transfer's actual_length may be positive even when an error has been
 437  * reported.  That's because transfers often involve several packets, so that
 438  * one or more packets could finish before an error stops further endpoint I/O.
 439  *
 440  * For isochronous URBs, the urb status value is non-zero only if the URB is
 441  * unlinked, the device is removed, the host controller is disabled or the total
 442  * transferred length is less than the requested length and the URB_SHORT_NOT_OK
 443  * flag is set.  Completion handlers for isochronous URBs should only see
 444  * urb->status set to zero, -ENOENT, -ECONNRESET, -ESHUTDOWN, or -EREMOTEIO.
 445  * Individual frame descriptor status fields may report more status codes.
 446  *
 447  *
 448  * 0                    Transfer completed successfully
 449  *
 450  * -ENOENT              URB was synchronously unlinked by usb_unlink_urb
 451  *
 452  * -EINPROGRESS         URB still pending, no results yet
 453  *                      (That is, if drivers see this it's a bug.)
 454  *
 455  * -EPROTO (*, **)      a) bitstuff error
 456  *                      b) no response packet received within the
 457  *                         prescribed bus turn-around time
 458  *                      c) unknown USB error
 459  *
 460  * -EILSEQ (*, **)      a) CRC mismatch
 461  *                      b) no response packet received within the
 462  *                         prescribed bus turn-around time
 463  *                      c) unknown USB error
 464  *
 465  *                      Note that often the controller hardware does not
 466  *                      distinguish among cases a), b), and c), so a
 467  *                      driver cannot tell whether there was a protocol
 468  *                      error, a failure to respond (often caused by
 469  *                      device disconnect), or some other fault.
 470  *
 471  * -ETIME (**)          No response packet received within the prescribed
 472  *                      bus turn-around time.  This error may instead be
 473  *                      reported as -EPROTO or -EILSEQ.
 474  *
 475  * -ETIMEDOUT           Synchronous USB message functions use this code
 476  *                      to indicate timeout expired before the transfer
 477  *                      completed, and no other error was reported by HC.
 478  *
 479  * -EPIPE (**)          Endpoint stalled.  For non-control endpoints,
 480  *                      reset this status with usb_clear_halt().
 481  *
 482  * -ECOMM               During an IN transfer, the host controller
 483  *                      received data from an endpoint faster than it
 484  *                      could be written to system memory
 485  *
 486  * -ENOSR               During an OUT transfer, the host controller
 487  *                      could not retrieve data from system memory fast
 488  *                      enough to keep up with the USB data rate
 489  *
 490  * -EOVERFLOW (*)       The amount of data returned by the endpoint was
 491  *                      greater than either the max packet size of the
 492  *                      endpoint or the remaining buffer size.  "Babble".
 493  *
 494  * -EREMOTEIO           The data read from the endpoint did not fill the
 495  *                      specified buffer, and URB_SHORT_NOT_OK was set in
 496  *                      urb->transfer_flags.
 497  *
 498  * -ENODEV              Device was removed.  Often preceded by a burst of
 499  *                      other errors, since the hub driver doesn't detect
 500  *                      device removal events immediately.
 501  *
 502  * -EXDEV               ISO transfer only partially completed
 503  *                      (only set in iso_frame_desc[n].status, not urb->status)
 504  *
 505  * -EINVAL              ISO madness, if this happens: Log off and go home
 506  *
 507  * -ECONNRESET          URB was asynchronously unlinked by usb_unlink_urb
 508  *
 509  * -ESHUTDOWN           The device or host controller has been disabled due
 510  *                      to some problem that could not be worked around,
 511  *                      such as a physical disconnect.
 512  *
 513  *
 514  * (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
 515  * hardware problems such as bad devices (including firmware) or cables.
 516  *
 517  * (**) This is also one of several codes that different kinds of host
 518  * controller use to indicate a transfer has failed because of device
 519  * disconnect.  In the interval before the hub driver starts disconnect
 520  * processing, devices may receive such fault reports for every request.
 521  *
 522  * See <https://www.kernel.org/doc/Documentation/usb/error-codes.txt>
 523  */
 524 static void hdm_read_completion(struct urb *urb)
 525 {
 526         struct mbo *mbo = urb->context;
 527         struct most_dev *mdev = to_mdev(mbo->ifp);
 528         unsigned int channel = mbo->hdm_channel_id;
 529         struct device *dev = &mdev->usb_device->dev;
 530         spinlock_t *lock = mdev->channel_lock + channel;
 531         unsigned long flags;
 532
 533         spin_lock_irqsave(lock, flags);
 534         if (urb->status == -ENOENT || urb->status == -ECONNRESET ||
 535             !mdev->is_channel_healthy[channel]) {
 536                 spin_unlock_irqrestore(lock, flags);
 537                 return;
 538         }
 539
 540         if (unlikely(urb->status && urb->status != -ESHUTDOWN)) {
 541                 mbo->processed_length = 0;
 542                 switch (urb->status) {
 543                 case -EPIPE:
 544                         dev_warn(dev, "Broken IN pipe detected\n");
 545                         mdev->is_channel_healthy[channel] = false;
 546                         spin_unlock_irqrestore(lock, flags);
 547                         mdev->clear_work[channel].pipe = urb->pipe;
 548                         schedule_work(&mdev->clear_work[channel].ws);
 549                         return;
 550                 case -ENODEV:
 551                 case -EPROTO:
 552                         mbo->status = MBO_E_CLOSE;
 553                         break;
 554                 case -EOVERFLOW:
 555                         dev_warn(dev, "Babble on IN pipe detected\n");
 556                 default:
 557                         mbo->status = MBO_E_INVAL;
 558                         break;
 559                 }
 560         } else {
 561                 mbo->processed_length = urb->actual_length;
 562                 mbo->status = MBO_SUCCESS;
 563                 if (mdev->padding_active[channel] &&
 564                     hdm_remove_padding(mdev, channel, mbo)) {
 565                         mbo->processed_length = 0;
 566                         mbo->status = MBO_E_INVAL;
 567                 }
 568         }
 569
 570         spin_unlock_irqrestore(lock, flags);
 571
 572         if (likely(mbo->complete))
 573                 mbo->complete(mbo);
 574         usb_free_urb(urb);
 575 }
 576
 577 /**
 578  * hdm_enqueue - receive a buffer to be used for data transfer
 579  * @iface: interface to enqueue to
 580  * @channel: ID of the channel
 581  * @mbo: pointer to the buffer object
 582  *
 583  * This allocates a new URB and fills it according to the channel
 584  * that is being used for transmission of data. Before the URB is
 585  * submitted it is stored in the private anchor list.
 586  *
 587  * Returns 0 on success. On any error the URB is freed and a error code
 588  * is returned.
 589  *
 590  * Context: Could in _some_ cases be interrupt!
 591  */
 592 static int hdm_enqueue(struct most_interface *iface, int channel,
 593                        struct mbo *mbo)
 594 {
 595         struct most_dev *mdev;
 596         struct most_channel_config *conf;
 597         struct device *dev;
 598         int retval = 0;
 599         struct urb *urb;
 600         unsigned long length;
 601         void *virt_address;
 602
 603         if (unlikely(!iface || !mbo))
 604                 return -EIO;
 605         if (unlikely(iface->num_channels <= channel || channel < 0))
 606                 return -ECHRNG;
 607
 608         mdev = to_mdev(iface);
 609         conf = &mdev->conf[channel];
 610         dev = &mdev->usb_device->dev;
 611
 612         if (!mdev->usb_device)
 613                 return -ENODEV;
 614
 615         urb = usb_alloc_urb(NO_ISOCHRONOUS_URB, GFP_ATOMIC);
 616         if (!urb)
 617                 return -ENOMEM;
 618
 619         if ((conf->direction & MOST_CH_TX) && mdev->padding_active[channel] &&
 620             hdm_add_padding(mdev, channel, mbo)) {
 621                 retval = -EIO;
 622                 goto _error;
 623         }
 624
 625         urb->transfer_dma = mbo->bus_address;
 626         virt_address = mbo->virt_address;
 627         length = mbo->buffer_length;
 628
 629         if (conf->direction & MOST_CH_TX) {
 630                 usb_fill_bulk_urb(urb, mdev->usb_device,
 631                                   usb_sndbulkpipe(mdev->usb_device,
 632                                                   mdev->ep_address[channel]),
 633                                   virt_address,
 634                                   length,
 635                                   hdm_write_completion,
 636                                   mbo);
 637                 if (conf->data_type != MOST_CH_ISOC)
 638                         urb->transfer_flags |= URB_ZERO_PACKET;
 639         } else {
 640                 usb_fill_bulk_urb(urb, mdev->usb_device,
 641                                   usb_rcvbulkpipe(mdev->usb_device,
 642                                                   mdev->ep_address[channel]),
 643                                   virt_address,
 644                                   length + conf->extra_len,
 645                                   hdm_read_completion,
 646                                   mbo);
 647         }
 648         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 649
 650         usb_anchor_urb(urb, &mdev->busy_urbs[channel]);
 651
 652         retval = usb_submit_urb(urb, GFP_KERNEL);
 653         if (retval) {
 654                 dev_err(dev, "URB submit failed with error %d.\n", retval);
 655                 goto _error_1;
 656         }
 657         return 0;
 658
 659 _error_1:
 660         usb_unanchor_urb(urb);
 661 _error:
 662         usb_free_urb(urb);
 663         return retval;
 664 }
 665
 666 /**
 667  * hdm_configure_channel - receive channel configuration from core
 668  * @iface: interface
 669  * @channel: channel ID
 670  * @conf: structure that holds the configuration information
 671  */
 672 static int hdm_configure_channel(struct most_interface *iface, int channel,
 673                                  struct most_channel_config *conf)
 674 {
 675         unsigned int num_frames;
 676         unsigned int frame_size;
 677         unsigned int temp_size;
 678         unsigned int tail_space;
 679         struct most_dev *mdev = to_mdev(iface);
 680         struct device *dev = &mdev->usb_device->dev;
 681
 682         mdev->is_channel_healthy[channel] = true;
 683         mdev->clear_work[channel].channel = channel;
 684         mdev->clear_work[channel].mdev = mdev;
 685         INIT_WORK(&mdev->clear_work[channel].ws, wq_clear_halt);
 686
 687         if (unlikely(!iface || !conf)) {
 688                 dev_err(dev, "Bad interface or config pointer.\n");
 689                 return -EINVAL;
 690         }
 691         if (unlikely(channel < 0 || channel >= iface->num_channels)) {
 692                 dev_err(dev, "Channel ID out of range.\n");
 693                 return -EINVAL;
 694         }
 695         if (!conf->num_buffers || !conf->buffer_size) {
 696                 dev_err(dev, "Misconfig: buffer size or #buffers zero.\n");
 697                 return -EINVAL;
 698         }
 699
 700         if (conf->data_type != MOST_CH_SYNC &&
 701             !(conf->data_type == MOST_CH_ISOC &&
 702               conf->packets_per_xact != 0xFF)) {
 703                 mdev->padding_active[channel] = false;
 704                 goto exit;
 705         }
 706
 707         mdev->padding_active[channel] = true;
 708         temp_size = conf->buffer_size;
 709
 710         frame_size = get_stream_frame_size(conf);
 711         if (frame_size == 0 || frame_size > USB_MTU) {
 712                 dev_warn(dev, "Misconfig: frame size wrong\n");
 713                 return -EINVAL;
 714         }
 715
 716         if (conf->buffer_size % frame_size) {
 717                 u16 tmp_val;
 718
 719                 tmp_val = conf->buffer_size / frame_size;
 720                 conf->buffer_size = tmp_val * frame_size;
 721                 dev_notice(dev,
 722                            "Channel %d - rounding buffer size to %d bytes, channel config says %d bytes\n",
 723                            channel,
 724                            conf->buffer_size,
 725                            temp_size);
 726         }
 727
 728         num_frames = conf->buffer_size / frame_size;
 729         tail_space = num_frames * (USB_MTU - frame_size);
 730         temp_size += tail_space;
 731
 732         /* calculate extra length to comply w/ HW padding */
 733         conf->extra_len = (DIV_ROUND_UP(temp_size, USB_MTU) * USB_MTU)
 734                           - conf->buffer_size;
 735 exit:
 736         mdev->conf[channel] = *conf;
 737         return 0;
 738 }
 739
 740 /**
 741  * hdm_update_netinfo - retrieve latest networking information
 742  * @mdev: device interface
 743  *
 744  * This triggers the USB vendor requests to read the hardware address and
 745  * the current link status of the attached device.
 746  */
 747 static int hdm_update_netinfo(struct most_dev *mdev)
 748 {
 749         struct usb_device *usb_device = mdev->usb_device;
 750         struct device *dev = &usb_device->dev;
 751         u16 hi, mi, lo, link;
 752
 753         if (!is_valid_ether_addr(mdev->hw_addr)) {
 754                 if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_HI, &hi) < 0) {
 755                         dev_err(dev, "Vendor request \"hw_addr_hi\" failed\n");
 756                         return -EFAULT;
 757                 }
 758
 759                 if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_MI, &mi) < 0) {
 760                         dev_err(dev, "Vendor request \"hw_addr_mid\" failed\n");
 761                         return -EFAULT;
 762                 }
 763
 764                 if (drci_rd_reg(usb_device, DRCI_REG_HW_ADDR_LO, &lo) < 0) {
 765                         dev_err(dev, "Vendor request \"hw_addr_low\" failed\n");
 766                         return -EFAULT;
 767                 }
 768
 769                 mutex_lock(&mdev->io_mutex);
 770                 mdev->hw_addr[0] = hi >> 8;
 771                 mdev->hw_addr[1] = hi;
 772                 mdev->hw_addr[2] = mi >> 8;
 773                 mdev->hw_addr[3] = mi;
 774                 mdev->hw_addr[4] = lo >> 8;
 775                 mdev->hw_addr[5] = lo;
 776                 mutex_unlock(&mdev->io_mutex);
 777         }
 778
 779         if (drci_rd_reg(usb_device, DRCI_REG_NI_STATE, &link) < 0) {
 780                 dev_err(dev, "Vendor request \"link status\" failed\n");
 781                 return -EFAULT;
 782         }
 783
 784         mutex_lock(&mdev->io_mutex);
 785         mdev->link_stat = link;
 786         mutex_unlock(&mdev->io_mutex);
 787         return 0;
 788 }
 789
 790 /**
 791  * hdm_request_netinfo - request network information
 792  * @iface: pointer to interface
 793  * @channel: channel ID
 794  *
 795  * This is used as trigger to set up the link status timer that
 796  * polls for the NI state of the INIC every 2 seconds.
 797  *
 798  */
 799 static void hdm_request_netinfo(struct most_interface *iface, int channel)
 800 {
 801         struct most_dev *mdev;
 802
 803         BUG_ON(!iface);
 804         mdev = to_mdev(iface);
 805         mdev->link_stat_timer.expires = jiffies + HZ;
 806         mod_timer(&mdev->link_stat_timer, mdev->link_stat_timer.expires);
 807 }
 808
 809 /**
 810  * link_stat_timer_handler - add work to link_stat work queue
 811  * @data: pointer to USB device instance
 812  *
 813  * The handler runs in interrupt context. That's why we need to defer the
 814  * tasks to a work queue.
 815  */
 816 static void link_stat_timer_handler(unsigned long data)
 817 {
 818         struct most_dev *mdev = (struct most_dev *)data;
 819
 820         schedule_work(&mdev->poll_work_obj);
 821         mdev->link_stat_timer.expires = jiffies + (2 * HZ);
 822         add_timer(&mdev->link_stat_timer);
 823 }
 824
 825 /**
 826  * wq_netinfo - work queue function
 827  * @wq_obj: object that holds data for our deferred work to do
 828  *
 829  * This retrieves the network interface status of the USB INIC
 830  * and compares it with the current status. If the status has
 831  * changed, it updates the status of the core.
 832  */
 833 static void wq_netinfo(struct work_struct *wq_obj)
 834 {
 835         struct most_dev *mdev = to_mdev_from_work(wq_obj);
 836         int i, prev_link_stat = mdev->link_stat;
 837         u8 prev_hw_addr[6];
 838
 839         for (i = 0; i < 6; i++)
 840                 prev_hw_addr[i] = mdev->hw_addr[i];
 841
 842         if (hdm_update_netinfo(mdev) < 0)
 843                 return;
 844         if (prev_link_stat != mdev->link_stat ||
 845             prev_hw_addr[0] != mdev->hw_addr[0] ||
 846             prev_hw_addr[1] != mdev->hw_addr[1] ||
 847             prev_hw_addr[2] != mdev->hw_addr[2] ||
 848             prev_hw_addr[3] != mdev->hw_addr[3] ||
 849             prev_hw_addr[4] != mdev->hw_addr[4] ||
 850             prev_hw_addr[5] != mdev->hw_addr[5])
 851                 most_deliver_netinfo(&mdev->iface, mdev->link_stat,
 852                                      &mdev->hw_addr[0]);
 853 }
 854
 855 /**
 856  * wq_clear_halt - work queue function
 857  * @wq_obj: work_struct object to execute
 858  *
 859  * This sends a clear_halt to the given USB pipe.
 860  */
 861 static void wq_clear_halt(struct work_struct *wq_obj)
 862 {
 863         struct clear_hold_work *clear_work = to_clear_hold_work(wq_obj);
 864         struct most_dev *mdev = clear_work->mdev;
 865         unsigned int channel = clear_work->channel;
 866         int pipe = clear_work->pipe;
 867
 868         mutex_lock(&mdev->io_mutex);
 869         most_stop_enqueue(&mdev->iface, channel);
 870         free_anchored_buffers(mdev, channel, MBO_E_INVAL);
 871         if (usb_clear_halt(mdev->usb_device, pipe))
 872                 dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
 873
 874         mdev->is_channel_healthy[channel] = true;
 875         most_resume_enqueue(&mdev->iface, channel);
 876         mutex_unlock(&mdev->io_mutex);
 877 }
 878
 879 /**
 880  * hdm_usb_fops - file operation table for USB driver
 881  */
 882 static const struct file_operations hdm_usb_fops = {
 883         .owner = THIS_MODULE,
 884 };
 885
 886 /**
 887  * usb_device_id - ID table for HCD device probing
 888  */
 889 static struct usb_device_id usbid[] = {
 890         { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_BRDG), },
 891         { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81118), },
 892         { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81119), },
 893         { USB_DEVICE(USB_VENDOR_ID_SMSC, USB_DEV_ID_OS81210), },
 894         { } /* Terminating entry */
 895 };
 896
 897 #define MOST_DCI_RO_ATTR(_name) \
 898         struct most_dci_attribute most_dci_attr_##_name = \
 899                 __ATTR(_name, S_IRUGO, show_value, NULL)
 900
 901 #define MOST_DCI_ATTR(_name) \
 902         struct most_dci_attribute most_dci_attr_##_name = \
 903                 __ATTR(_name, S_IRUGO | S_IWUSR, show_value, store_value)
 904
 905 #define MOST_DCI_WO_ATTR(_name) \
 906         struct most_dci_attribute most_dci_attr_##_name = \
 907                 __ATTR(_name, S_IWUSR, NULL, store_value)
 908
 909 /**
 910  * struct most_dci_attribute - to access the attributes of a dci object
 911  * @attr: attributes of a dci object
 912  * @show: pointer to the show function
 913  * @store: pointer to the store function
 914  */
 915 struct most_dci_attribute {
 916         struct attribute attr;
 917         ssize_t (*show)(struct most_dci_obj *d,
 918                         struct most_dci_attribute *attr,
 919                         char *buf);
 920         ssize_t (*store)(struct most_dci_obj *d,
 921                          struct most_dci_attribute *attr,
 922                          const char *buf,
 923                          size_t count);
 924 };
 925
 926 #define to_dci_attr(a) container_of(a, struct most_dci_attribute, attr)
 927
 928 /**
 929  * dci_attr_show - show function for dci object
 930  * @kobj: pointer to kobject
 931  * @attr: pointer to attribute struct
 932  * @buf: buffer
 933  */
 934 static ssize_t dci_attr_show(struct kobject *kobj, struct attribute *attr,
 935                              char *buf)
 936 {
 937         struct most_dci_attribute *dci_attr = to_dci_attr(attr);
 938         struct most_dci_obj *dci_obj = to_dci_obj(kobj);
 939
 940         if (!dci_attr->show)
 941                 return -EIO;
 942
 943         return dci_attr->show(dci_obj, dci_attr, buf);
 944 }
 945
 946 /**
 947  * dci_attr_store - store function for dci object
 948  * @kobj: pointer to kobject
 949  * @attr: pointer to attribute struct
 950  * @buf: buffer
 951  * @len: length of buffer
 952  */
 953 static ssize_t dci_attr_store(struct kobject *kobj,
 954                               struct attribute *attr,
 955                               const char *buf,
 956                               size_t len)
 957 {
 958         struct most_dci_attribute *dci_attr = to_dci_attr(attr);
 959         struct most_dci_obj *dci_obj = to_dci_obj(kobj);
 960
 961         if (!dci_attr->store)
 962                 return -EIO;
 963
 964         return dci_attr->store(dci_obj, dci_attr, buf, len);
 965 }
 966
 967 static const struct sysfs_ops most_dci_sysfs_ops = {
 968         .show = dci_attr_show,
 969         .store = dci_attr_store,
 970 };
 971
 972 /**
 973  * most_dci_release - release function for dci object
 974  * @kobj: pointer to kobject
 975  *
 976  * This frees the memory allocated for the dci object
 977  */
 978 static void most_dci_release(struct kobject *kobj)
 979 {
 980         struct most_dci_obj *dci_obj = to_dci_obj(kobj);
 981
 982         kfree(dci_obj);
 983 }
 984
 985 struct regs {
 986         const char *name;
 987         u16 reg;
 988 };
 989
 990 static const struct regs ro_regs[] = {
 991         { "ni_state", DRCI_REG_NI_STATE },
 992         { "packet_bandwidth", DRCI_REG_PACKET_BW },
 993         { "node_address", DRCI_REG_NODE_ADDR },
 994         { "node_position", DRCI_REG_NODE_POS },
 995 };
 996
 997 static const struct regs rw_regs[] = {
 998         { "mep_filter", DRCI_REG_MEP_FILTER },
 999         { "mep_hash0", DRCI_REG_HASH_TBL0 },
1000         { "mep_hash1", DRCI_REG_HASH_TBL1 },
1001         { "mep_hash2", DRCI_REG_HASH_TBL2 },
1002         { "mep_hash3", DRCI_REG_HASH_TBL3 },
1003         { "mep_eui48_hi", DRCI_REG_HW_ADDR_HI },
1004         { "mep_eui48_mi", DRCI_REG_HW_ADDR_MI },
1005         { "mep_eui48_lo", DRCI_REG_HW_ADDR_LO },
1006 };
1007
1008 static int get_stat_reg_addr(const struct regs *regs, int size,
1009                              const char *name, u16 *reg_addr)
1010 {
1011         int i;
1012
1013         for (i = 0; i < size; i++) {
1014                 if (!strcmp(name, regs[i].name)) {
1015                         *reg_addr = regs[i].reg;
1016                         return 0;
1017                 }
1018         }
1019         return -EFAULT;
1020 }
1021
1022 #define get_static_reg_addr(regs, name, reg_addr) \
1023         get_stat_reg_addr(regs, ARRAY_SIZE(regs), name, reg_addr)
1024
1025 static ssize_t show_value(struct most_dci_obj *dci_obj,
1026                           struct most_dci_attribute *attr, char *buf)
1027 {
1028         const char *name = attr->attr.name;
1029         u16 val;
1030         u16 reg_addr;
1031         int err;
1032
1033         if (!strcmp(name, "arb_address"))
1034                 return snprintf(buf, PAGE_SIZE, "%04x\n", dci_obj->reg_addr);
1035
1036         if (!strcmp(name, "arb_value"))
1037                 reg_addr = dci_obj->reg_addr;
1038         else if (get_static_reg_addr(ro_regs, name, &reg_addr) &&
1039                  get_static_reg_addr(rw_regs, name, &reg_addr))
1040                 return -EFAULT;
1041
1042         err = drci_rd_reg(dci_obj->usb_device, reg_addr, &val);
1043         if (err < 0)
1044                 return err;
1045
1046         return snprintf(buf, PAGE_SIZE, "%04x\n", val);
1047 }
1048
1049 static ssize_t store_value(struct most_dci_obj *dci_obj,
1050                            struct most_dci_attribute *attr,
1051                            const char *buf, size_t count)
1052 {
1053         u16 val;
1054         u16 reg_addr;
1055         const char *name = attr->attr.name;
1056         int err = kstrtou16(buf, 16, &val);
1057
1058         if (err)
1059                 return err;
1060
1061         if (!strcmp(name, "arb_address")) {
1062                 dci_obj->reg_addr = val;
1063                 return count;
1064         }
1065
1066         if (!strcmp(name, "arb_value")) {
1067                 reg_addr = dci_obj->reg_addr;
1068         } else if (!strcmp(name, "sync_ep")) {
1069                 u16 ep = val;
1070
1071                 reg_addr = DRCI_REG_BASE + DRCI_COMMAND + ep * 16;
1072                 val = 1;
1073         } else if (get_static_reg_addr(ro_regs, name, &reg_addr)) {
1074                 return -EFAULT;
1075         }
1076
1077         err = drci_wr_reg(dci_obj->usb_device, reg_addr, val);
1078         if (err < 0)
1079                 return err;
1080
1081         return count;
1082 }
1083
1084 static MOST_DCI_RO_ATTR(ni_state);
1085 static MOST_DCI_RO_ATTR(packet_bandwidth);
1086 static MOST_DCI_RO_ATTR(node_address);
1087 static MOST_DCI_RO_ATTR(node_position);
1088 static MOST_DCI_WO_ATTR(sync_ep);
1089 static MOST_DCI_ATTR(mep_filter);
1090 static MOST_DCI_ATTR(mep_hash0);
1091 static MOST_DCI_ATTR(mep_hash1);
1092 static MOST_DCI_ATTR(mep_hash2);
1093 static MOST_DCI_ATTR(mep_hash3);
1094 static MOST_DCI_ATTR(mep_eui48_hi);
1095 static MOST_DCI_ATTR(mep_eui48_mi);
1096 static MOST_DCI_ATTR(mep_eui48_lo);
1097 static MOST_DCI_ATTR(arb_address);
1098 static MOST_DCI_ATTR(arb_value);
1099
1100 /**
1101  * most_dci_def_attrs - array of default attribute files of the dci object
1102  */
1103 static struct attribute *most_dci_def_attrs[] = {
1104         &most_dci_attr_ni_state.attr,
1105         &most_dci_attr_packet_bandwidth.attr,
1106         &most_dci_attr_node_address.attr,
1107         &most_dci_attr_node_position.attr,
1108         &most_dci_attr_sync_ep.attr,
1109         &most_dci_attr_mep_filter.attr,
1110         &most_dci_attr_mep_hash0.attr,
1111         &most_dci_attr_mep_hash1.attr,
1112         &most_dci_attr_mep_hash2.attr,
1113         &most_dci_attr_mep_hash3.attr,
1114         &most_dci_attr_mep_eui48_hi.attr,
1115         &most_dci_attr_mep_eui48_mi.attr,
1116         &most_dci_attr_mep_eui48_lo.attr,
1117         &most_dci_attr_arb_address.attr,
1118         &most_dci_attr_arb_value.attr,
1119         NULL,
1120 };
1121
1122 /**
1123  * DCI ktype
1124  */
1125 static struct kobj_type most_dci_ktype = {
1126         .sysfs_ops = &most_dci_sysfs_ops,
1127         .release = most_dci_release,
1128         .default_attrs = most_dci_def_attrs,
1129 };
1130
1131 /**
1132  * create_most_dci_obj - allocates a dci object
1133  * @parent: parent kobject
1134  *
1135  * This creates a dci object and registers it with sysfs.
1136  * Returns a pointer to the object or NULL when something went wrong.
1137  */
1138 static struct
1139 most_dci_obj *create_most_dci_obj(struct kobject *parent)
1140 {
1141         struct most_dci_obj *most_dci = kzalloc(sizeof(*most_dci), GFP_KERNEL);
1142         int retval;
1143
1144         if (!most_dci)
1145                 return NULL;
1146
1147         retval = kobject_init_and_add(&most_dci->kobj, &most_dci_ktype, parent,
1148                                       "dci");
1149         if (retval) {
1150                 kobject_put(&most_dci->kobj);
1151                 return NULL;
1152         }
1153         return most_dci;
1154 }
1155
1156 /**
1157  * destroy_most_dci_obj - DCI object release function
1158  * @p: pointer to dci object
1159  */
1160 static void destroy_most_dci_obj(struct most_dci_obj *p)
1161 {
1162         kobject_put(&p->kobj);
1163 }
1164
1165 /**
1166  * hdm_probe - probe function of USB device driver
1167  * @interface: Interface of the attached USB device
1168  * @id: Pointer to the USB ID table.
1169  *
1170  * This allocates and initializes the device instance, adds the new
1171  * entry to the internal list, scans the USB descriptors and registers
1172  * the interface with the core.
1173  * Additionally, the DCI objects are created and the hardware is sync'd.
1174  *
1175  * Return 0 on success. In case of an error a negative number is returned.
1176  */
1177 static int
1178 hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
1179 {
1180         struct usb_host_interface *usb_iface_desc = interface->cur_altsetting;
1181         struct usb_device *usb_dev = interface_to_usbdev(interface);
1182         struct device *dev = &usb_dev->dev;
1183         struct most_dev *mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
1184         unsigned int i;
1185         unsigned int num_endpoints;
1186         struct most_channel_capability *tmp_cap;
1187         struct usb_endpoint_descriptor *ep_desc;
1188         int ret = 0;
1189         int err;
1190
1191         if (!mdev)
1192                 goto exit_ENOMEM;
1193
1194         usb_set_intfdata(interface, mdev);
1195         num_endpoints = usb_iface_desc->desc.bNumEndpoints;
1196         mutex_init(&mdev->io_mutex);
1197         INIT_WORK(&mdev->poll_work_obj, wq_netinfo);
1198         setup_timer(&mdev->link_stat_timer, link_stat_timer_handler,
1199                     (unsigned long)mdev);
1200
1201         mdev->usb_device = usb_dev;
1202         mdev->link_stat_timer.expires = jiffies + (2 * HZ);
1203
1204         mdev->iface.mod = hdm_usb_fops.owner;
1205         mdev->iface.interface = ITYPE_USB;
1206         mdev->iface.configure = hdm_configure_channel;
1207         mdev->iface.request_netinfo = hdm_request_netinfo;
1208         mdev->iface.enqueue = hdm_enqueue;
1209         mdev->iface.poison_channel = hdm_poison_channel;
1210         mdev->iface.description = mdev->description;
1211         mdev->iface.num_channels = num_endpoints;
1212
1213         snprintf(mdev->description, sizeof(mdev->description),
1214                  "usb_device %d-%s:%d.%d",
1215                  usb_dev->bus->busnum,
1216                  usb_dev->devpath,
1217                  usb_dev->config->desc.bConfigurationValue,
1218                  usb_iface_desc->desc.bInterfaceNumber);
1219
1220         mdev->conf = kcalloc(num_endpoints, sizeof(*mdev->conf), GFP_KERNEL);
1221         if (!mdev->conf)
1222                 goto exit_free;
1223
1224         mdev->cap = kcalloc(num_endpoints, sizeof(*mdev->cap), GFP_KERNEL);
1225         if (!mdev->cap)
1226                 goto exit_free1;
1227
1228         mdev->iface.channel_vector = mdev->cap;
1229         mdev->iface.priv = NULL;
1230
1231         mdev->ep_address =
1232                 kcalloc(num_endpoints, sizeof(*mdev->ep_address), GFP_KERNEL);
1233         if (!mdev->ep_address)
1234                 goto exit_free2;
1235
1236         mdev->busy_urbs =
1237                 kcalloc(num_endpoints, sizeof(*mdev->busy_urbs), GFP_KERNEL);
1238         if (!mdev->busy_urbs)
1239                 goto exit_free3;
1240
1241         tmp_cap = mdev->cap;
1242         for (i = 0; i < num_endpoints; i++) {
1243                 ep_desc = &usb_iface_desc->endpoint[i].desc;
1244                 mdev->ep_address[i] = ep_desc->bEndpointAddress;
1245                 mdev->padding_active[i] = false;
1246                 mdev->is_channel_healthy[i] = true;
1247
1248                 snprintf(&mdev->suffix[i][0], MAX_SUFFIX_LEN, "ep%02x",
1249                          mdev->ep_address[i]);
1250
1251                 tmp_cap->name_suffix = &mdev->suffix[i][0];
1252                 tmp_cap->buffer_size_packet = MAX_BUF_SIZE;
1253                 tmp_cap->buffer_size_streaming = MAX_BUF_SIZE;
1254                 tmp_cap->num_buffers_packet = BUF_CHAIN_SIZE;
1255                 tmp_cap->num_buffers_streaming = BUF_CHAIN_SIZE;
1256                 tmp_cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
1257                                      MOST_CH_ISOC | MOST_CH_SYNC;
1258                 if (usb_endpoint_dir_in(ep_desc))
1259                         tmp_cap->direction = MOST_CH_RX;
1260                 else
1261                         tmp_cap->direction = MOST_CH_TX;
1262                 tmp_cap++;
1263                 init_usb_anchor(&mdev->busy_urbs[i]);
1264                 spin_lock_init(&mdev->channel_lock[i]);
1265                 err = drci_wr_reg(usb_dev,
1266                                   DRCI_REG_BASE + DRCI_COMMAND +
1267                                   ep_desc->bEndpointAddress * 16,
1268                                   1);
1269                 if (err < 0)
1270                         dev_warn(dev, "DCI Sync for EP %02x failed",
1271                                  ep_desc->bEndpointAddress);
1272         }
1273         dev_notice(dev, "claimed gadget: Vendor=%4.4x ProdID=%4.4x Bus=%02x Device=%02x\n",
1274                    le16_to_cpu(usb_dev->descriptor.idVendor),
1275                    le16_to_cpu(usb_dev->descriptor.idProduct),
1276                    usb_dev->bus->busnum,
1277                    usb_dev->devnum);
1278
1279         dev_notice(dev, "device path: /sys/bus/usb/devices/%d-%s:%d.%d\n",
1280                    usb_dev->bus->busnum,
1281                    usb_dev->devpath,
1282                    usb_dev->config->desc.bConfigurationValue,
1283                    usb_iface_desc->desc.bInterfaceNumber);
1284
1285         mdev->parent = most_register_interface(&mdev->iface);
1286         if (IS_ERR(mdev->parent)) {
1287                 ret = PTR_ERR(mdev->parent);
1288                 goto exit_free4;
1289         }
1290
1291         mutex_lock(&mdev->io_mutex);
1292         if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81118 ||
1293             le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81119 ||
1294             le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81210) {
1295                 /* this increments the reference count of the instance
1296                  * object of the core
1297                  */
1298                 mdev->dci = create_most_dci_obj(mdev->parent);
1299                 if (!mdev->dci) {
1300                         mutex_unlock(&mdev->io_mutex);
1301                         most_deregister_interface(&mdev->iface);
1302                         ret = -ENOMEM;
1303                         goto exit_free4;
1304                 }
1305
1306                 kobject_uevent(&mdev->dci->kobj, KOBJ_ADD);
1307                 mdev->dci->usb_device = mdev->usb_device;
1308         }
1309         mutex_unlock(&mdev->io_mutex);
1310         return 0;
1311
1312 exit_free4:
1313         kfree(mdev->busy_urbs);
1314 exit_free3:
1315         kfree(mdev->ep_address);
1316 exit_free2:
1317         kfree(mdev->cap);
1318 exit_free1:
1319         kfree(mdev->conf);
1320 exit_free:
1321         kfree(mdev);
1322 exit_ENOMEM:
1323         if (ret == 0 || ret == -ENOMEM) {
1324                 ret = -ENOMEM;
1325                 dev_err(dev, "out of memory\n");
1326         }
1327         return ret;
1328 }
1329
1330 /**
1331  * hdm_disconnect - disconnect function of USB device driver
1332  * @interface: Interface of the attached USB device
1333  *
1334  * This deregisters the interface with the core, removes the kernel timer
1335  * and frees resources.
1336  *
1337  * Context: hub kernel thread
1338  */
1339 static void hdm_disconnect(struct usb_interface *interface)
1340 {
1341         struct most_dev *mdev = usb_get_intfdata(interface);
1342
1343         mutex_lock(&mdev->io_mutex);
1344         usb_set_intfdata(interface, NULL);
1345         mdev->usb_device = NULL;
1346         mutex_unlock(&mdev->io_mutex);
1347
1348         del_timer_sync(&mdev->link_stat_timer);
1349         cancel_work_sync(&mdev->poll_work_obj);
1350
1351         destroy_most_dci_obj(mdev->dci);
1352         most_deregister_interface(&mdev->iface);
1353
1354         kfree(mdev->busy_urbs);
1355         kfree(mdev->cap);
1356         kfree(mdev->conf);
1357         kfree(mdev->ep_address);
1358         kfree(mdev);
1359 }
1360
1361 static struct usb_driver hdm_usb = {
1362         .name = "hdm_usb",
1363         .id_table = usbid,
1364         .probe = hdm_probe,
1365         .disconnect = hdm_disconnect,
1366 };
1367
1368 static int __init hdm_usb_init(void)
1369 {
1370         pr_info("hdm_usb_init()\n");
1371         if (usb_register(&hdm_usb)) {
1372                 pr_err("could not register hdm_usb driver\n");
1373                 return -EIO;
1374         }
1375
1376         return 0;
1377 }
1378
1379 static void __exit hdm_usb_exit(void)
1380 {
1381         pr_info("hdm_usb_exit()\n");
1382         usb_deregister(&hdm_usb);
1383 }
1384
1385 module_init(hdm_usb_init);
1386 module_exit(hdm_usb_exit);
1387 MODULE_LICENSE("GPL");
1388 MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
1389 MODULE_DESCRIPTION("HDM_4_USB");