drivers/staging/hv/hv_mouse.c

   1 /*
   2  *  Copyright (c) 2009, Citrix Systems, Inc.
   3  *  Copyright (c) 2010, Microsoft Corporation.
   4  *  Copyright (c) 2011, Novell Inc.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms and conditions of the GNU General Public License,
   8  *  version 2, as published by the Free Software Foundation.
   9  *
  10  *  This program is distributed in the hope it will be useful, but WITHOUT
  11  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  *  more details.
  14  */
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/delay.h>
  18 #include <linux/device.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/sched.h>
  21 #include <linux/wait.h>
  22 #include <linux/input.h>
  23 #include <linux/hid.h>
  24 #include <linux/hiddev.h>
  25
  26 #include "hyperv.h"
  27
  28
  29 /*
  30  * Data types
  31  */
  32 struct hv_input_dev_info {
  33         unsigned short vendor;
  34         unsigned short product;
  35         unsigned short version;
  36         char name[128];
  37 };
  38
  39 /* The maximum size of a synthetic input message. */
  40 #define SYNTHHID_MAX_INPUT_REPORT_SIZE 16
  41
  42 /*
  43  * Current version
  44  *
  45  * History:
  46  * Beta, RC < 2008/1/22        1,0
  47  * RC > 2008/1/22              2,0
  48  */
  49 #define SYNTHHID_INPUT_VERSION_MAJOR    2
  50 #define SYNTHHID_INPUT_VERSION_MINOR    0
  51 #define SYNTHHID_INPUT_VERSION          (SYNTHHID_INPUT_VERSION_MINOR | \
  52                                          (SYNTHHID_INPUT_VERSION_MAJOR << 16))
  53
  54
  55 #pragma pack(push, 1)
  56 /*
  57  * Message types in the synthetic input protocol
  58  */
  59 enum synthhid_msg_type {
  60         SynthHidProtocolRequest,
  61         SynthHidProtocolResponse,
  62         SynthHidInitialDeviceInfo,
  63         SynthHidInitialDeviceInfoAck,
  64         SynthHidInputReport,
  65         SynthHidMax
  66 };
  67
  68 /*
  69  * Basic message structures.
  70  */
  71 struct synthhid_msg_hdr {
  72         enum synthhid_msg_type type;
  73         u32 size;
  74 };
  75
  76 struct synthhid_msg {
  77         struct synthhid_msg_hdr header;
  78         char data[1]; /* Enclosed message */
  79 };
  80
  81 union synthhid_version {
  82         struct {
  83                 u16 minor_version;
  84                 u16 major_version;
  85         };
  86         u32 version;
  87 };
  88
  89 /*
  90  * Protocol messages
  91  */
  92 struct synthhid_protocol_request {
  93         struct synthhid_msg_hdr header;
  94         union synthhid_version version_requested;
  95 };
  96
  97 struct synthhid_protocol_response {
  98         struct synthhid_msg_hdr header;
  99         union synthhid_version version_requested;
 100         unsigned char approved;
 101 };
 102
 103 struct synthhid_device_info {
 104         struct synthhid_msg_hdr header;
 105         struct hv_input_dev_info hid_dev_info;
 106         struct hid_descriptor hid_descriptor;
 107 };
 108
 109 struct synthhid_device_info_ack {
 110         struct synthhid_msg_hdr header;
 111         unsigned char reserved;
 112 };
 113
 114 struct synthhid_input_report {
 115         struct synthhid_msg_hdr header;
 116         char buffer[1];
 117 };
 118
 119 #pragma pack(pop)
 120
 121 #define INPUTVSC_SEND_RING_BUFFER_SIZE          (10*PAGE_SIZE)
 122 #define INPUTVSC_RECV_RING_BUFFER_SIZE          (10*PAGE_SIZE)
 123
 124 #define NBITS(x) (((x)/BITS_PER_LONG)+1)
 125
 126 enum pipe_prot_msg_type {
 127         PipeMessageInvalid = 0,
 128         PipeMessageData,
 129         PipeMessageMaximum
 130 };
 131
 132
 133 struct pipe_prt_msg {
 134         enum pipe_prot_msg_type type;
 135         u32 size;
 136         char data[1];
 137 };
 138
 139 /*
 140  * Data types
 141  */
 142 struct  mousevsc_prt_msg {
 143         enum pipe_prot_msg_type type;
 144         u32 size;
 145         union {
 146                 struct synthhid_protocol_request request;
 147                 struct synthhid_protocol_response response;
 148                 struct synthhid_device_info_ack ack;
 149         };
 150 };
 151
 152 /*
 153  * Represents an mousevsc device
 154  */
 155 struct mousevsc_dev {
 156         struct hv_device        *device;
 157         /* 0 indicates the device is being destroyed */
 158         atomic_t                ref_count;
 159         int                     num_outstanding_req;
 160         unsigned char           init_complete;
 161         struct mousevsc_prt_msg protocol_req;
 162         struct mousevsc_prt_msg protocol_resp;
 163         /* Synchronize the request/response if needed */
 164         wait_queue_head_t       protocol_wait_event;
 165         wait_queue_head_t       dev_info_wait_event;
 166         int                     protocol_wait_condition;
 167         int                     device_wait_condition;
 168         int                     dev_info_status;
 169
 170         struct hid_descriptor   *hid_desc;
 171         unsigned char           *report_desc;
 172         u32                     report_desc_size;
 173         struct hv_input_dev_info hid_dev_info;
 174 };
 175
 176 struct input_device_context {
 177         struct hv_device        *device_ctx;
 178         struct hid_device       *hid_device;
 179         struct hv_input_dev_info device_info;
 180         int                     connected;
 181 };
 182
 183 static struct mousevsc_dev *alloc_input_device(struct hv_device *device)
 184 {
 185         struct mousevsc_dev *input_dev;
 186
 187         input_dev = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);
 188
 189         if (!input_dev)
 190                 return NULL;
 191
 192         /*
 193          * Set to 2 to allow both inbound and outbound traffics
 194          * (ie get_input_device() and must_get_input_device()) to proceed.
 195          */
 196         atomic_cmpxchg(&input_dev->ref_count, 0, 2);
 197
 198         input_dev->device = device;
 199         device->ext = input_dev;
 200
 201         return input_dev;
 202 }
 203
 204 static void free_input_device(struct mousevsc_dev *device)
 205 {
 206         WARN_ON(atomic_read(&device->ref_count) == 0);
 207         kfree(device);
 208 }
 209
 210 /*
 211  * Get the inputdevice object if exists and its refcount > 1
 212  */
 213 static struct mousevsc_dev *get_input_device(struct hv_device *device)
 214 {
 215         struct mousevsc_dev *input_dev;
 216
 217         input_dev = (struct mousevsc_dev *)device->ext;
 218
 219 /*
 220  *      FIXME
 221  *      This sure isn't a valid thing to print for debugging, no matter
 222  *      what the intention is...
 223  *
 224  *      printk(KERN_ERR "-------------------------> REFCOUNT = %d",
 225  *             input_dev->ref_count);
 226  */
 227
 228         if (input_dev && atomic_read(&input_dev->ref_count) > 1)
 229                 atomic_inc(&input_dev->ref_count);
 230         else
 231                 input_dev = NULL;
 232
 233         return input_dev;
 234 }
 235
 236 /*
 237  * Get the inputdevice object iff exists and its refcount > 0
 238  */
 239 static struct mousevsc_dev *must_get_input_device(struct hv_device *device)
 240 {
 241         struct mousevsc_dev *input_dev;
 242
 243         input_dev = (struct mousevsc_dev *)device->ext;
 244
 245         if (input_dev && atomic_read(&input_dev->ref_count))
 246                 atomic_inc(&input_dev->ref_count);
 247         else
 248                 input_dev = NULL;
 249
 250         return input_dev;
 251 }
 252
 253 static void put_input_device(struct hv_device *device)
 254 {
 255         struct mousevsc_dev *input_dev;
 256
 257         input_dev = (struct mousevsc_dev *)device->ext;
 258
 259         atomic_dec(&input_dev->ref_count);
 260 }
 261
 262 /*
 263  * Drop ref count to 1 to effectively disable get_input_device()
 264  */
 265 static struct mousevsc_dev *release_input_device(struct hv_device *device)
 266 {
 267         struct mousevsc_dev *input_dev;
 268
 269         input_dev = (struct mousevsc_dev *)device->ext;
 270
 271         /* Busy wait until the ref drop to 2, then set it to 1  */
 272         while (atomic_cmpxchg(&input_dev->ref_count, 2, 1) != 2)
 273                 udelay(100);
 274
 275         return input_dev;
 276 }
 277
 278 /*
 279  * Drop ref count to 0. No one can use input_device object.
 280  */
 281 static struct mousevsc_dev *final_release_input_device(struct hv_device *device)
 282 {
 283         struct mousevsc_dev *input_dev;
 284
 285         input_dev = (struct mousevsc_dev *)device->ext;
 286
 287         /* Busy wait until the ref drop to 1, then set it to 0  */
 288         while (atomic_cmpxchg(&input_dev->ref_count, 1, 0) != 1)
 289                 udelay(100);
 290
 291         device->ext = NULL;
 292         return input_dev;
 293 }
 294
 295 static void mousevsc_on_send_completion(struct hv_device *device,
 296                                         struct vmpacket_descriptor *packet)
 297 {
 298         struct mousevsc_dev *input_dev;
 299         void *request;
 300
 301         input_dev = must_get_input_device(device);
 302         if (!input_dev) {
 303                 pr_err("unable to get input device...device being destroyed?");
 304                 return;
 305         }
 306
 307         request = (void *)(unsigned long)packet->trans_id;
 308
 309         if (request == &input_dev->protocol_req) {
 310                 /* FIXME */
 311                 /* Shouldn't we be doing something here? */
 312         }
 313
 314         put_input_device(device);
 315 }
 316
 317 static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
 318                                 struct synthhid_device_info *device_info)
 319 {
 320         int ret = 0;
 321         struct hid_descriptor *desc;
 322         struct mousevsc_prt_msg ack;
 323
 324         /* Assume success for now */
 325         input_device->dev_info_status = 0;
 326
 327         /* Save the device attr */
 328         memcpy(&input_device->hid_dev_info, &device_info->hid_dev_info,
 329                 sizeof(struct hv_input_dev_info));
 330
 331         /* Save the hid desc */
 332         desc = &device_info->hid_descriptor;
 333         WARN_ON(desc->bLength > 0);
 334
 335         input_device->hid_desc = kzalloc(desc->bLength, GFP_KERNEL);
 336
 337         if (!input_device->hid_desc) {
 338                 pr_err("unable to allocate hid descriptor - size %d", desc->bLength);
 339                 goto cleanup;
 340         }
 341
 342         memcpy(input_device->hid_desc, desc, desc->bLength);
 343
 344         /* Save the report desc */
 345         input_device->report_desc_size = desc->desc[0].wDescriptorLength;
 346         input_device->report_desc = kzalloc(input_device->report_desc_size,
 347                                           GFP_KERNEL);
 348
 349         if (!input_device->report_desc) {
 350                 pr_err("unable to allocate report descriptor - size %d",
 351                            input_device->report_desc_size);
 352                 goto cleanup;
 353         }
 354
 355         memcpy(input_device->report_desc,
 356                ((unsigned char *)desc) + desc->bLength,
 357                desc->desc[0].wDescriptorLength);
 358
 359         /* Send the ack */
 360         memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
 361
 362         ack.type = PipeMessageData;
 363         ack.size = sizeof(struct synthhid_device_info_ack);
 364
 365         ack.ack.header.type = SynthHidInitialDeviceInfoAck;
 366         ack.ack.header.size = 1;
 367         ack.ack.reserved = 0;
 368
 369         ret = vmbus_sendpacket(input_device->device->channel,
 370                         &ack,
 371                         sizeof(struct pipe_prt_msg) - sizeof(unsigned char) +
 372                         sizeof(struct synthhid_device_info_ack),
 373                         (unsigned long)&ack,
 374                         VM_PKT_DATA_INBAND,
 375                         VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 376         if (ret != 0) {
 377                 pr_err("unable to send synthhid device info ack - ret %d",
 378                            ret);
 379                 goto cleanup;
 380         }
 381
 382         input_device->device_wait_condition = 1;
 383         wake_up(&input_device->dev_info_wait_event);
 384
 385         return;
 386
 387 cleanup:
 388         kfree(input_device->hid_desc);
 389         input_device->hid_desc = NULL;
 390
 391         kfree(input_device->report_desc);
 392         input_device->report_desc = NULL;
 393
 394         input_device->dev_info_status = -1;
 395         input_device->device_wait_condition = 1;
 396         wake_up(&input_device->dev_info_wait_event);
 397 }
 398
 399 static void mousevsc_on_receive_input_report(struct mousevsc_dev *input_device,
 400                                 struct synthhid_input_report *input_report)
 401 {
 402         struct hv_driver *input_drv;
 403         struct input_device_context *input_dev_ctx;
 404
 405         if (!input_device->init_complete) {
 406                 pr_info("Initialization incomplete...ignoring input_report msg");
 407                 return;
 408         }
 409
 410         input_drv = drv_to_hv_drv(input_device->device->device.driver);
 411
 412         input_dev_ctx = dev_get_drvdata(&input_device->device->device);
 413
 414         hid_input_report(input_dev_ctx->hid_device,
 415                               HID_INPUT_REPORT, input_report->buffer, input_report->header.size, 1);
 416
 417 }
 418
 419 static void mousevsc_on_receive(struct hv_device *device,
 420                                 struct vmpacket_descriptor *packet)
 421 {
 422         struct pipe_prt_msg *pipe_msg;
 423         struct synthhid_msg *hid_msg;
 424         struct mousevsc_dev *input_dev;
 425
 426         input_dev = must_get_input_device(device);
 427         if (!input_dev) {
 428                 pr_err("unable to get input device...device being destroyed?");
 429                 return;
 430         }
 431
 432         pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
 433                                                 (packet->offset8 << 3));
 434
 435         if (pipe_msg->type != PipeMessageData) {
 436                 pr_err("unknown pipe msg type - type %d len %d",
 437                            pipe_msg->type, pipe_msg->size);
 438                 put_input_device(device);
 439                 return ;
 440         }
 441
 442         hid_msg = (struct synthhid_msg *)&pipe_msg->data[0];
 443
 444         switch (hid_msg->header.type) {
 445         case SynthHidProtocolResponse:
 446                 memcpy(&input_dev->protocol_resp, pipe_msg,
 447                        pipe_msg->size + sizeof(struct pipe_prt_msg) -
 448                        sizeof(unsigned char));
 449                 input_dev->protocol_wait_condition = 1;
 450                 wake_up(&input_dev->protocol_wait_event);
 451                 break;
 452
 453         case SynthHidInitialDeviceInfo:
 454                 WARN_ON(pipe_msg->size >= sizeof(struct hv_input_dev_info));
 455
 456                 /*
 457                  * Parse out the device info into device attr,
 458                  * hid desc and report desc
 459                  */
 460                 mousevsc_on_receive_device_info(input_dev,
 461                         (struct synthhid_device_info *)&pipe_msg->data[0]);
 462                 break;
 463         case SynthHidInputReport:
 464                 mousevsc_on_receive_input_report(input_dev,
 465                         (struct synthhid_input_report *)&pipe_msg->data[0]);
 466
 467                 break;
 468         default:
 469                 pr_err("unsupported hid msg type - type %d len %d",
 470                        hid_msg->header.type, hid_msg->header.size);
 471                 break;
 472         }
 473
 474         put_input_device(device);
 475 }
 476
 477 static void mousevsc_on_channel_callback(void *context)
 478 {
 479         const int packetSize = 0x100;
 480         int ret = 0;
 481         struct hv_device *device = (struct hv_device *)context;
 482         struct mousevsc_dev *input_dev;
 483
 484         u32 bytes_recvd;
 485         u64 req_id;
 486         unsigned char packet[0x100];
 487         struct vmpacket_descriptor *desc;
 488         unsigned char   *buffer = packet;
 489         int     bufferlen = packetSize;
 490
 491         input_dev = must_get_input_device(device);
 492
 493         if (!input_dev) {
 494                 pr_err("unable to get input device...device being destroyed?");
 495                 return;
 496         }
 497
 498         do {
 499                 ret = vmbus_recvpacket_raw(device->channel, buffer,
 500                                         bufferlen, &bytes_recvd, &req_id);
 501
 502                 if (ret == 0) {
 503                         if (bytes_recvd > 0) {
 504                                 desc = (struct vmpacket_descriptor *)buffer;
 505
 506                                 switch (desc->type) {
 507                                 case VM_PKT_COMP:
 508                                         mousevsc_on_send_completion(
 509                                                 device, desc);
 510                                         break;
 511
 512                                 case VM_PKT_DATA_INBAND:
 513                                         mousevsc_on_receive(
 514                                                 device, desc);
 515                                         break;
 516
 517                                 default:
 518                                         pr_err("unhandled packet type %d, tid %llx len %d\n",
 519                                                    desc->type,
 520                                                    req_id,
 521                                                    bytes_recvd);
 522                                         break;
 523                                 }
 524
 525                                 /* reset */
 526                                 if (bufferlen > packetSize) {
 527                                         kfree(buffer);
 528
 529                                         buffer = packet;
 530                                         bufferlen = packetSize;
 531                                 }
 532                         } else {
 533                                 /*
 534                                  * pr_debug("nothing else to read...");
 535                                  * reset
 536                                  */
 537                                 if (bufferlen > packetSize) {
 538                                         kfree(buffer);
 539
 540                                         buffer = packet;
 541                                         bufferlen = packetSize;
 542                                 }
 543                                 break;
 544                         }
 545                 } else if (ret == -ENOBUFS) {
 546                         /* Handle large packet */
 547                         bufferlen = bytes_recvd;
 548                         buffer = kzalloc(bytes_recvd, GFP_KERNEL);
 549
 550                         if (buffer == NULL) {
 551                                 buffer = packet;
 552                                 bufferlen = packetSize;
 553
 554                                 /* Try again next time around */
 555                                 pr_err("unable to allocate buffer of size %d!",
 556                                        bytes_recvd);
 557                                 break;
 558                         }
 559                 }
 560         } while (1);
 561
 562         put_input_device(device);
 563
 564         return;
 565 }
 566
 567 static int mousevsc_connect_to_vsp(struct hv_device *device)
 568 {
 569         int ret = 0;
 570         struct mousevsc_dev *input_dev;
 571         struct mousevsc_prt_msg *request;
 572         struct mousevsc_prt_msg *response;
 573
 574         input_dev = get_input_device(device);
 575
 576         if (!input_dev) {
 577                 pr_err("unable to get input device...device being destroyed?");
 578                 return -1;
 579         }
 580
 581         init_waitqueue_head(&input_dev->protocol_wait_event);
 582         init_waitqueue_head(&input_dev->dev_info_wait_event);
 583
 584         request = &input_dev->protocol_req;
 585
 586         /*
 587          * Now, initiate the vsc/vsp initialization protocol on the open channel
 588          */
 589         memset(request, 0, sizeof(struct mousevsc_prt_msg));
 590
 591         request->type = PipeMessageData;
 592         request->size = sizeof(struct synthhid_protocol_request);
 593
 594         request->request.header.type = SynthHidProtocolRequest;
 595         request->request.header.size = sizeof(unsigned long);
 596         request->request.version_requested.version = SYNTHHID_INPUT_VERSION;
 597
 598         pr_info("synthhid protocol request...");
 599
 600         ret = vmbus_sendpacket(device->channel, request,
 601                                         sizeof(struct pipe_prt_msg) -
 602                                         sizeof(unsigned char) +
 603                                         sizeof(struct synthhid_protocol_request),
 604                                         (unsigned long)request,
 605                                         VM_PKT_DATA_INBAND,
 606                                         VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 607         if (ret != 0) {
 608                 pr_err("unable to send synthhid protocol request.");
 609                 goto cleanup;
 610         }
 611
 612         input_dev->protocol_wait_condition = 0;
 613         wait_event_timeout(input_dev->protocol_wait_event,
 614                 input_dev->protocol_wait_condition, msecs_to_jiffies(1000));
 615         if (input_dev->protocol_wait_condition == 0) {
 616                 ret = -ETIMEDOUT;
 617                 goto cleanup;
 618         }
 619
 620         response = &input_dev->protocol_resp;
 621
 622         if (!response->response.approved) {
 623                 pr_err("synthhid protocol request failed (version %d)",
 624                        SYNTHHID_INPUT_VERSION);
 625                 ret = -1;
 626                 goto cleanup;
 627         }
 628
 629         input_dev->device_wait_condition = 0;
 630         wait_event_timeout(input_dev->dev_info_wait_event,
 631                 input_dev->device_wait_condition, msecs_to_jiffies(1000));
 632         if (input_dev->device_wait_condition == 0) {
 633                 ret = -ETIMEDOUT;
 634                 goto cleanup;
 635         }
 636
 637         /*
 638          * We should have gotten the device attr, hid desc and report
 639          * desc at this point
 640          */
 641         if (!input_dev->dev_info_status)
 642                 pr_info("**** input channel up and running!! ****");
 643         else
 644                 ret = -1;
 645
 646 cleanup:
 647         put_input_device(device);
 648
 649         return ret;
 650 }
 651
 652 static int mousevsc_hid_open(struct hid_device *hid)
 653 {
 654         return 0;
 655 }
 656
 657 static void mousevsc_hid_close(struct hid_device *hid)
 658 {
 659 }
 660
 661 static void reportdesc_callback(struct hv_device *dev, void *packet, u32 len)
 662 {
 663         struct input_device_context *input_device_ctx =
 664                 dev_get_drvdata(&dev->device);
 665         struct hid_device *hid_dev;
 666
 667         /* hid_debug = -1; */
 668         hid_dev = kmalloc(sizeof(struct hid_device), GFP_KERNEL);
 669
 670         if (hid_parse_report(hid_dev, packet, len)) {
 671                 DPRINT_INFO(INPUTVSC_DRV, "Unable to call hd_parse_report");
 672                 return;
 673         }
 674
 675         if (hid_dev) {
 676                 DPRINT_INFO(INPUTVSC_DRV, "hid_device created");
 677
 678                 hid_dev->ll_driver->open  = mousevsc_hid_open;
 679                 hid_dev->ll_driver->close = mousevsc_hid_close;
 680
 681                 hid_dev->bus = BUS_VIRTUAL;
 682                 hid_dev->vendor = input_device_ctx->device_info.vendor;
 683                 hid_dev->product = input_device_ctx->device_info.product;
 684                 hid_dev->version = input_device_ctx->device_info.version;
 685                 hid_dev->dev = dev->device;
 686
 687                 sprintf(hid_dev->name, "%s",
 688                         input_device_ctx->device_info.name);
 689
 690                 /*
 691                  * HJ Do we want to call it with a 0
 692                  */
 693                 if (!hidinput_connect(hid_dev, 0)) {
 694                         hid_dev->claimed |= HID_CLAIMED_INPUT;
 695
 696                         input_device_ctx->connected = 1;
 697
 698                         DPRINT_INFO(INPUTVSC_DRV,
 699                                      "HID device claimed by input\n");
 700                 }
 701
 702                 if (!hid_dev->claimed) {
 703                         DPRINT_ERR(INPUTVSC_DRV,
 704                                     "HID device not claimed by "
 705                                     "input or hiddev\n");
 706                 }
 707
 708                 input_device_ctx->hid_device = hid_dev;
 709         }
 710
 711         kfree(hid_dev);
 712 }
 713
 714 static int mousevsc_on_device_add(struct hv_device *device,
 715                                         void *additional_info)
 716 {
 717         int ret = 0;
 718         struct mousevsc_dev *input_dev;
 719         struct hv_driver *input_drv;
 720         struct hv_input_dev_info dev_info;
 721         struct input_device_context *input_device_ctx;
 722
 723         input_dev = alloc_input_device(device);
 724
 725         if (!input_dev) {
 726                 ret = -1;
 727                 goto cleanup;
 728         }
 729
 730         input_dev->init_complete = false;
 731
 732         /* Open the channel */
 733         ret = vmbus_open(device->channel,
 734                 INPUTVSC_SEND_RING_BUFFER_SIZE,
 735                 INPUTVSC_RECV_RING_BUFFER_SIZE,
 736                 NULL,
 737                 0,
 738                 mousevsc_on_channel_callback,
 739                 device
 740                 );
 741
 742         if (ret != 0) {
 743                 pr_err("unable to open channel: %d", ret);
 744                 free_input_device(input_dev);
 745                 return -1;
 746         }
 747
 748         pr_info("InputVsc channel open: %d", ret);
 749
 750         ret = mousevsc_connect_to_vsp(device);
 751
 752         if (ret != 0) {
 753                 pr_err("unable to connect channel: %d", ret);
 754
 755                 vmbus_close(device->channel);
 756                 free_input_device(input_dev);
 757                 return ret;
 758         }
 759
 760         input_drv = drv_to_hv_drv(input_dev->device->device.driver);
 761
 762         dev_info.vendor = input_dev->hid_dev_info.vendor;
 763         dev_info.product = input_dev->hid_dev_info.product;
 764         dev_info.version = input_dev->hid_dev_info.version;
 765         strcpy(dev_info.name, "Microsoft Vmbus HID-compliant Mouse");
 766
 767         /* Send the device info back up */
 768         input_device_ctx = dev_get_drvdata(&device->device);
 769         memcpy(&input_device_ctx->device_info, &dev_info,
 770                sizeof(struct hv_input_dev_info));
 771
 772         /* Send the report desc back up */
 773         /* workaround SA-167 */
 774         if (input_dev->report_desc[14] == 0x25)
 775                 input_dev->report_desc[14] = 0x29;
 776
 777         reportdesc_callback(device, input_dev->report_desc,
 778                             input_dev->report_desc_size);
 779
 780         input_dev->init_complete = true;
 781
 782 cleanup:
 783         return ret;
 784 }
 785
 786 static int mousevsc_on_device_remove(struct hv_device *device)
 787 {
 788         struct mousevsc_dev *input_dev;
 789         int ret = 0;
 790
 791         pr_info("disabling input device (%p)...",
 792                     device->ext);
 793
 794         input_dev = release_input_device(device);
 795
 796
 797         /*
 798          * At this point, all outbound traffic should be disable. We only
 799          * allow inbound traffic (responses) to proceed
 800          *
 801          * so that outstanding requests can be completed.
 802          */
 803         while (input_dev->num_outstanding_req) {
 804                 pr_info("waiting for %d requests to complete...",
 805                         input_dev->num_outstanding_req);
 806
 807                 udelay(100);
 808         }
 809
 810         pr_info("removing input device (%p)...", device->ext);
 811
 812         input_dev = final_release_input_device(device);
 813
 814         pr_info("input device (%p) safe to remove", input_dev);
 815
 816         /* Close the channel */
 817         vmbus_close(device->channel);
 818
 819         free_input_device(input_dev);
 820
 821         return ret;
 822 }
 823
 824
 825 static int mousevsc_probe(struct hv_device *dev)
 826 {
 827         int ret = 0;
 828
 829         struct input_device_context *input_dev_ctx;
 830
 831         input_dev_ctx = kmalloc(sizeof(struct input_device_context),
 832                                 GFP_KERNEL);
 833
 834         dev_set_drvdata(&dev->device, input_dev_ctx);
 835
 836         /* Call to the vsc driver to add the device */
 837         ret = mousevsc_on_device_add(dev, NULL);
 838
 839         if (ret != 0) {
 840                 DPRINT_ERR(INPUTVSC_DRV, "unable to add input vsc device");
 841
 842                 return -1;
 843         }
 844
 845         return 0;
 846 }
 847
 848 static int mousevsc_remove(struct hv_device *dev)
 849 {
 850         struct input_device_context *input_dev_ctx;
 851         int ret;
 852
 853         input_dev_ctx = dev_get_drvdata(&dev->device);
 854         if (input_dev_ctx->connected) {
 855                 hidinput_disconnect(input_dev_ctx->hid_device);
 856                 input_dev_ctx->connected = 0;
 857         }
 858
 859         /*
 860          * Call to the vsc driver to let it know that the device
 861          * is being removed
 862          */
 863         ret = mousevsc_on_device_remove(dev);
 864         if (ret != 0) {
 865                 DPRINT_ERR(INPUTVSC_DRV,
 866                            "unable to remove vsc device (ret %d)", ret);
 867         }
 868
 869         kfree(input_dev_ctx);
 870
 871         return ret;
 872 }
 873
 874 static const struct hv_vmbus_device_id id_table[] = {
 875         /* Mouse guid */
 876         { VMBUS_DEVICE(0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
 877                        0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A) },
 878         { },
 879 };
 880
 881 /*
 882  * The mouse driver is not functional; do not auto-load it.
 883  */
 884 /* MODULE_DEVICE_TABLE(vmbus, id_table); */
 885
 886 static struct  hv_driver mousevsc_drv = {
 887         .name = "mousevsc",
 888         .id_table = id_table,
 889         .probe = mousevsc_probe,
 890         .remove = mousevsc_remove,
 891 };
 892
 893 static int __init mousevsc_init(void)
 894 {
 895         return vmbus_driver_register(&mousevsc_drv);
 896 }
 897
 898 static void __exit mousevsc_exit(void)
 899 {
 900         vmbus_driver_unregister(&mousevsc_drv);
 901 }
 902
 903 MODULE_LICENSE("GPL");
 904 MODULE_VERSION(HV_DRV_VERSION);
 905 module_init(mousevsc_init);
 906 module_exit(mousevsc_exit);
 907