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 void reportdesc_callback(struct hv_device *dev, void *packet, u32 len);
 184
 185 static struct mousevsc_dev *alloc_input_device(struct hv_device *device)
 186 {
 187         struct mousevsc_dev *input_dev;
 188
 189         input_dev = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);
 190
 191         if (!input_dev)
 192                 return NULL;
 193
 194         /*
 195          * Set to 2 to allow both inbound and outbound traffics
 196          * (ie get_input_device() and must_get_input_device()) to proceed.
 197          */
 198         atomic_cmpxchg(&input_dev->ref_count, 0, 2);
 199
 200         input_dev->device = device;
 201         device->ext = input_dev;
 202
 203         return input_dev;
 204 }
 205
 206 static void free_input_device(struct mousevsc_dev *device)
 207 {
 208         WARN_ON(atomic_read(&device->ref_count) == 0);
 209         kfree(device);
 210 }
 211
 212 /*
 213  * Get the inputdevice object if exists and its refcount > 1
 214  */
 215 static struct mousevsc_dev *get_input_device(struct hv_device *device)
 216 {
 217         struct mousevsc_dev *input_dev;
 218
 219         input_dev = (struct mousevsc_dev *)device->ext;
 220
 221 /*
 222  *      FIXME
 223  *      This sure isn't a valid thing to print for debugging, no matter
 224  *      what the intention is...
 225  *
 226  *      printk(KERN_ERR "-------------------------> REFCOUNT = %d",
 227  *             input_dev->ref_count);
 228  */
 229
 230         if (input_dev && atomic_read(&input_dev->ref_count) > 1)
 231                 atomic_inc(&input_dev->ref_count);
 232         else
 233                 input_dev = NULL;
 234
 235         return input_dev;
 236 }
 237
 238 /*
 239  * Get the inputdevice object iff exists and its refcount > 0
 240  */
 241 static struct mousevsc_dev *must_get_input_device(struct hv_device *device)
 242 {
 243         struct mousevsc_dev *input_dev;
 244
 245         input_dev = (struct mousevsc_dev *)device->ext;
 246
 247         if (input_dev && atomic_read(&input_dev->ref_count))
 248                 atomic_inc(&input_dev->ref_count);
 249         else
 250                 input_dev = NULL;
 251
 252         return input_dev;
 253 }
 254
 255 static void put_input_device(struct hv_device *device)
 256 {
 257         struct mousevsc_dev *input_dev;
 258
 259         input_dev = (struct mousevsc_dev *)device->ext;
 260
 261         atomic_dec(&input_dev->ref_count);
 262 }
 263
 264 /*
 265  * Drop ref count to 1 to effectively disable get_input_device()
 266  */
 267 static struct mousevsc_dev *release_input_device(struct hv_device *device)
 268 {
 269         struct mousevsc_dev *input_dev;
 270
 271         input_dev = (struct mousevsc_dev *)device->ext;
 272
 273         /* Busy wait until the ref drop to 2, then set it to 1  */
 274         while (atomic_cmpxchg(&input_dev->ref_count, 2, 1) != 2)
 275                 udelay(100);
 276
 277         return input_dev;
 278 }
 279
 280 /*
 281  * Drop ref count to 0. No one can use input_device object.
 282  */
 283 static struct mousevsc_dev *final_release_input_device(struct hv_device *device)
 284 {
 285         struct mousevsc_dev *input_dev;
 286
 287         input_dev = (struct mousevsc_dev *)device->ext;
 288
 289         /* Busy wait until the ref drop to 1, then set it to 0  */
 290         while (atomic_cmpxchg(&input_dev->ref_count, 1, 0) != 1)
 291                 udelay(100);
 292
 293         device->ext = NULL;
 294         return input_dev;
 295 }
 296
 297 static void mousevsc_on_send_completion(struct hv_device *device,
 298                                         struct vmpacket_descriptor *packet)
 299 {
 300         struct mousevsc_dev *input_dev;
 301         void *request;
 302
 303         input_dev = must_get_input_device(device);
 304         if (!input_dev) {
 305                 pr_err("unable to get input device...device being destroyed?");
 306                 return;
 307         }
 308
 309         request = (void *)(unsigned long)packet->trans_id;
 310
 311         if (request == &input_dev->protocol_req) {
 312                 /* FIXME */
 313                 /* Shouldn't we be doing something here? */
 314         }
 315
 316         put_input_device(device);
 317 }
 318
 319 static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
 320                                 struct synthhid_device_info *device_info)
 321 {
 322         int ret = 0;
 323         struct hid_descriptor *desc;
 324         struct mousevsc_prt_msg ack;
 325
 326         /* Assume success for now */
 327         input_device->dev_info_status = 0;
 328
 329         /* Save the device attr */
 330         memcpy(&input_device->hid_dev_info, &device_info->hid_dev_info,
 331                 sizeof(struct hv_input_dev_info));
 332
 333         /* Save the hid desc */
 334         desc = &device_info->hid_descriptor;
 335         WARN_ON(desc->bLength > 0);
 336
 337         input_device->hid_desc = kzalloc(desc->bLength, GFP_KERNEL);
 338
 339         if (!input_device->hid_desc) {
 340                 pr_err("unable to allocate hid descriptor - size %d", desc->bLength);
 341                 goto cleanup;
 342         }
 343
 344         memcpy(input_device->hid_desc, desc, desc->bLength);
 345
 346         /* Save the report desc */
 347         input_device->report_desc_size = desc->desc[0].wDescriptorLength;
 348         input_device->report_desc = kzalloc(input_device->report_desc_size,
 349                                           GFP_KERNEL);
 350
 351         if (!input_device->report_desc) {
 352                 pr_err("unable to allocate report descriptor - size %d",
 353                            input_device->report_desc_size);
 354                 goto cleanup;
 355         }
 356
 357         memcpy(input_device->report_desc,
 358                ((unsigned char *)desc) + desc->bLength,
 359                desc->desc[0].wDescriptorLength);
 360
 361         /* Send the ack */
 362         memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
 363
 364         ack.type = PipeMessageData;
 365         ack.size = sizeof(struct synthhid_device_info_ack);
 366
 367         ack.ack.header.type = SynthHidInitialDeviceInfoAck;
 368         ack.ack.header.size = 1;
 369         ack.ack.reserved = 0;
 370
 371         ret = vmbus_sendpacket(input_device->device->channel,
 372                         &ack,
 373                         sizeof(struct pipe_prt_msg) - sizeof(unsigned char) +
 374                         sizeof(struct synthhid_device_info_ack),
 375                         (unsigned long)&ack,
 376                         VM_PKT_DATA_INBAND,
 377                         VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 378         if (ret != 0) {
 379                 pr_err("unable to send synthhid device info ack - ret %d",
 380                            ret);
 381                 goto cleanup;
 382         }
 383
 384         input_device->device_wait_condition = 1;
 385         wake_up(&input_device->dev_info_wait_event);
 386
 387         return;
 388
 389 cleanup:
 390         kfree(input_device->hid_desc);
 391         input_device->hid_desc = NULL;
 392
 393         kfree(input_device->report_desc);
 394         input_device->report_desc = NULL;
 395
 396         input_device->dev_info_status = -1;
 397         input_device->device_wait_condition = 1;
 398         wake_up(&input_device->dev_info_wait_event);
 399 }
 400
 401 static void mousevsc_on_receive_input_report(struct mousevsc_dev *input_device,
 402                                 struct synthhid_input_report *input_report)
 403 {
 404         struct hv_driver *input_drv;
 405         struct input_device_context *input_dev_ctx;
 406
 407         if (!input_device->init_complete) {
 408                 pr_info("Initialization incomplete...ignoring input_report msg");
 409                 return;
 410         }
 411
 412         input_drv = drv_to_hv_drv(input_device->device->device.driver);
 413
 414         input_dev_ctx = dev_get_drvdata(&input_device->device->device);
 415
 416         hid_input_report(input_dev_ctx->hid_device,
 417                               HID_INPUT_REPORT, input_report->buffer, input_report->header.size, 1);
 418
 419 }
 420
 421 static void mousevsc_on_receive(struct hv_device *device,
 422                                 struct vmpacket_descriptor *packet)
 423 {
 424         struct pipe_prt_msg *pipe_msg;
 425         struct synthhid_msg *hid_msg;
 426         struct mousevsc_dev *input_dev;
 427
 428         input_dev = must_get_input_device(device);
 429         if (!input_dev) {
 430                 pr_err("unable to get input device...device being destroyed?");
 431                 return;
 432         }
 433
 434         pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
 435                                                 (packet->offset8 << 3));
 436
 437         if (pipe_msg->type != PipeMessageData) {
 438                 pr_err("unknown pipe msg type - type %d len %d",
 439                            pipe_msg->type, pipe_msg->size);
 440                 put_input_device(device);
 441                 return ;
 442         }
 443
 444         hid_msg = (struct synthhid_msg *)&pipe_msg->data[0];
 445
 446         switch (hid_msg->header.type) {
 447         case SynthHidProtocolResponse:
 448                 memcpy(&input_dev->protocol_resp, pipe_msg,
 449                        pipe_msg->size + sizeof(struct pipe_prt_msg) -
 450                        sizeof(unsigned char));
 451                 input_dev->protocol_wait_condition = 1;
 452                 wake_up(&input_dev->protocol_wait_event);
 453                 break;
 454
 455         case SynthHidInitialDeviceInfo:
 456                 WARN_ON(pipe_msg->size >= sizeof(struct hv_input_dev_info));
 457
 458                 /*
 459                  * Parse out the device info into device attr,
 460                  * hid desc and report desc
 461                  */
 462                 mousevsc_on_receive_device_info(input_dev,
 463                         (struct synthhid_device_info *)&pipe_msg->data[0]);
 464                 break;
 465         case SynthHidInputReport:
 466                 mousevsc_on_receive_input_report(input_dev,
 467                         (struct synthhid_input_report *)&pipe_msg->data[0]);
 468
 469                 break;
 470         default:
 471                 pr_err("unsupported hid msg type - type %d len %d",
 472                        hid_msg->header.type, hid_msg->header.size);
 473                 break;
 474         }
 475
 476         put_input_device(device);
 477 }
 478
 479 static void mousevsc_on_channel_callback(void *context)
 480 {
 481         const int packetSize = 0x100;
 482         int ret = 0;
 483         struct hv_device *device = (struct hv_device *)context;
 484         struct mousevsc_dev *input_dev;
 485
 486         u32 bytes_recvd;
 487         u64 req_id;
 488         unsigned char packet[0x100];
 489         struct vmpacket_descriptor *desc;
 490         unsigned char   *buffer = packet;
 491         int     bufferlen = packetSize;
 492
 493         input_dev = must_get_input_device(device);
 494
 495         if (!input_dev) {
 496                 pr_err("unable to get input device...device being destroyed?");
 497                 return;
 498         }
 499
 500         do {
 501                 ret = vmbus_recvpacket_raw(device->channel, buffer,
 502                                         bufferlen, &bytes_recvd, &req_id);
 503
 504                 if (ret == 0) {
 505                         if (bytes_recvd > 0) {
 506                                 desc = (struct vmpacket_descriptor *)buffer;
 507
 508                                 switch (desc->type) {
 509                                 case VM_PKT_COMP:
 510                                         mousevsc_on_send_completion(
 511                                                 device, desc);
 512                                         break;
 513
 514                                 case VM_PKT_DATA_INBAND:
 515                                         mousevsc_on_receive(
 516                                                 device, desc);
 517                                         break;
 518
 519                                 default:
 520                                         pr_err("unhandled packet type %d, tid %llx len %d\n",
 521                                                    desc->type,
 522                                                    req_id,
 523                                                    bytes_recvd);
 524                                         break;
 525                                 }
 526
 527                                 /* reset */
 528                                 if (bufferlen > packetSize) {
 529                                         kfree(buffer);
 530
 531                                         buffer = packet;
 532                                         bufferlen = packetSize;
 533                                 }
 534                         } else {
 535                                 /*
 536                                  * pr_debug("nothing else to read...");
 537                                  * reset
 538                                  */
 539                                 if (bufferlen > packetSize) {
 540                                         kfree(buffer);
 541
 542                                         buffer = packet;
 543                                         bufferlen = packetSize;
 544                                 }
 545                                 break;
 546                         }
 547                 } else if (ret == -ENOBUFS) {
 548                         /* Handle large packet */
 549                         bufferlen = bytes_recvd;
 550                         buffer = kzalloc(bytes_recvd, GFP_KERNEL);
 551
 552                         if (buffer == NULL) {
 553                                 buffer = packet;
 554                                 bufferlen = packetSize;
 555
 556                                 /* Try again next time around */
 557                                 pr_err("unable to allocate buffer of size %d!",
 558                                        bytes_recvd);
 559                                 break;
 560                         }
 561                 }
 562         } while (1);
 563
 564         put_input_device(device);
 565
 566         return;
 567 }
 568
 569 static int mousevsc_connect_to_vsp(struct hv_device *device)
 570 {
 571         int ret = 0;
 572         struct mousevsc_dev *input_dev;
 573         struct mousevsc_prt_msg *request;
 574         struct mousevsc_prt_msg *response;
 575
 576         input_dev = get_input_device(device);
 577
 578         if (!input_dev) {
 579                 pr_err("unable to get input device...device being destroyed?");
 580                 return -1;
 581         }
 582
 583         init_waitqueue_head(&input_dev->protocol_wait_event);
 584         init_waitqueue_head(&input_dev->dev_info_wait_event);
 585
 586         request = &input_dev->protocol_req;
 587
 588         /*
 589          * Now, initiate the vsc/vsp initialization protocol on the open channel
 590          */
 591         memset(request, 0, sizeof(struct mousevsc_prt_msg));
 592
 593         request->type = PipeMessageData;
 594         request->size = sizeof(struct synthhid_protocol_request);
 595
 596         request->request.header.type = SynthHidProtocolRequest;
 597         request->request.header.size = sizeof(unsigned long);
 598         request->request.version_requested.version = SYNTHHID_INPUT_VERSION;
 599
 600         pr_info("synthhid protocol request...");
 601
 602         ret = vmbus_sendpacket(device->channel, request,
 603                                         sizeof(struct pipe_prt_msg) -
 604                                         sizeof(unsigned char) +
 605                                         sizeof(struct synthhid_protocol_request),
 606                                         (unsigned long)request,
 607                                         VM_PKT_DATA_INBAND,
 608                                         VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 609         if (ret != 0) {
 610                 pr_err("unable to send synthhid protocol request.");
 611                 goto cleanup;
 612         }
 613
 614         input_dev->protocol_wait_condition = 0;
 615         wait_event_timeout(input_dev->protocol_wait_event,
 616                 input_dev->protocol_wait_condition, msecs_to_jiffies(1000));
 617         if (input_dev->protocol_wait_condition == 0) {
 618                 ret = -ETIMEDOUT;
 619                 goto cleanup;
 620         }
 621
 622         response = &input_dev->protocol_resp;
 623
 624         if (!response->response.approved) {
 625                 pr_err("synthhid protocol request failed (version %d)",
 626                        SYNTHHID_INPUT_VERSION);
 627                 ret = -1;
 628                 goto cleanup;
 629         }
 630
 631         input_dev->device_wait_condition = 0;
 632         wait_event_timeout(input_dev->dev_info_wait_event,
 633                 input_dev->device_wait_condition, msecs_to_jiffies(1000));
 634         if (input_dev->device_wait_condition == 0) {
 635                 ret = -ETIMEDOUT;
 636                 goto cleanup;
 637         }
 638
 639         /*
 640          * We should have gotten the device attr, hid desc and report
 641          * desc at this point
 642          */
 643         if (!input_dev->dev_info_status)
 644                 pr_info("**** input channel up and running!! ****");
 645         else
 646                 ret = -1;
 647
 648 cleanup:
 649         put_input_device(device);
 650
 651         return ret;
 652 }
 653
 654 static int mousevsc_on_device_add(struct hv_device *device,
 655                                         void *additional_info)
 656 {
 657         int ret = 0;
 658         struct mousevsc_dev *input_dev;
 659         struct hv_driver *input_drv;
 660         struct hv_input_dev_info dev_info;
 661         struct input_device_context *input_device_ctx;
 662
 663         input_dev = alloc_input_device(device);
 664
 665         if (!input_dev) {
 666                 ret = -1;
 667                 goto cleanup;
 668         }
 669
 670         input_dev->init_complete = false;
 671
 672         /* Open the channel */
 673         ret = vmbus_open(device->channel,
 674                 INPUTVSC_SEND_RING_BUFFER_SIZE,
 675                 INPUTVSC_RECV_RING_BUFFER_SIZE,
 676                 NULL,
 677                 0,
 678                 mousevsc_on_channel_callback,
 679                 device
 680                 );
 681
 682         if (ret != 0) {
 683                 pr_err("unable to open channel: %d", ret);
 684                 free_input_device(input_dev);
 685                 return -1;
 686         }
 687
 688         pr_info("InputVsc channel open: %d", ret);
 689
 690         ret = mousevsc_connect_to_vsp(device);
 691
 692         if (ret != 0) {
 693                 pr_err("unable to connect channel: %d", ret);
 694
 695                 vmbus_close(device->channel);
 696                 free_input_device(input_dev);
 697                 return ret;
 698         }
 699
 700         input_drv = drv_to_hv_drv(input_dev->device->device.driver);
 701
 702         dev_info.vendor = input_dev->hid_dev_info.vendor;
 703         dev_info.product = input_dev->hid_dev_info.product;
 704         dev_info.version = input_dev->hid_dev_info.version;
 705         strcpy(dev_info.name, "Microsoft Vmbus HID-compliant Mouse");
 706
 707         /* Send the device info back up */
 708         input_device_ctx = dev_get_drvdata(&device->device);
 709         memcpy(&input_device_ctx->device_info, &dev_info,
 710                sizeof(struct hv_input_dev_info));
 711
 712         /* Send the report desc back up */
 713         /* workaround SA-167 */
 714         if (input_dev->report_desc[14] == 0x25)
 715                 input_dev->report_desc[14] = 0x29;
 716
 717         reportdesc_callback(device, input_dev->report_desc,
 718                             input_dev->report_desc_size);
 719
 720         input_dev->init_complete = true;
 721
 722 cleanup:
 723         return ret;
 724 }
 725
 726 static int mousevsc_on_device_remove(struct hv_device *device)
 727 {
 728         struct mousevsc_dev *input_dev;
 729         int ret = 0;
 730
 731         pr_info("disabling input device (%p)...",
 732                     device->ext);
 733
 734         input_dev = release_input_device(device);
 735
 736
 737         /*
 738          * At this point, all outbound traffic should be disable. We only
 739          * allow inbound traffic (responses) to proceed
 740          *
 741          * so that outstanding requests can be completed.
 742          */
 743         while (input_dev->num_outstanding_req) {
 744                 pr_info("waiting for %d requests to complete...",
 745                         input_dev->num_outstanding_req);
 746
 747                 udelay(100);
 748         }
 749
 750         pr_info("removing input device (%p)...", device->ext);
 751
 752         input_dev = final_release_input_device(device);
 753
 754         pr_info("input device (%p) safe to remove", input_dev);
 755
 756         /* Close the channel */
 757         vmbus_close(device->channel);
 758
 759         free_input_device(input_dev);
 760
 761         return ret;
 762 }
 763
 764
 765 static int mousevsc_hid_open(struct hid_device *hid)
 766 {
 767         return 0;
 768 }
 769
 770 static void mousevsc_hid_close(struct hid_device *hid)
 771 {
 772 }
 773
 774 static int mousevsc_probe(struct hv_device *dev)
 775 {
 776         int ret = 0;
 777
 778         struct input_device_context *input_dev_ctx;
 779
 780         input_dev_ctx = kmalloc(sizeof(struct input_device_context),
 781                                 GFP_KERNEL);
 782
 783         dev_set_drvdata(&dev->device, input_dev_ctx);
 784
 785         /* Call to the vsc driver to add the device */
 786         ret = mousevsc_on_device_add(dev, NULL);
 787
 788         if (ret != 0) {
 789                 DPRINT_ERR(INPUTVSC_DRV, "unable to add input vsc device");
 790
 791                 return -1;
 792         }
 793
 794         return 0;
 795 }
 796
 797 static int mousevsc_remove(struct hv_device *dev)
 798 {
 799         int ret = 0;
 800
 801         struct input_device_context *input_dev_ctx;
 802
 803         input_dev_ctx = kmalloc(sizeof(struct input_device_context),
 804                                 GFP_KERNEL);
 805
 806         dev_set_drvdata(&dev->device, input_dev_ctx);
 807
 808         if (input_dev_ctx->connected) {
 809                 hidinput_disconnect(input_dev_ctx->hid_device);
 810                 input_dev_ctx->connected = 0;
 811         }
 812
 813         /*
 814          * Call to the vsc driver to let it know that the device
 815          * is being removed
 816          */
 817         ret = mousevsc_on_device_remove(dev);
 818
 819         if (ret != 0) {
 820                 DPRINT_ERR(INPUTVSC_DRV,
 821                            "unable to remove vsc device (ret %d)", ret);
 822         }
 823
 824         kfree(input_dev_ctx);
 825
 826         return ret;
 827 }
 828
 829 static void reportdesc_callback(struct hv_device *dev, void *packet, u32 len)
 830 {
 831         struct input_device_context *input_device_ctx =
 832                 dev_get_drvdata(&dev->device);
 833         struct hid_device *hid_dev;
 834
 835         /* hid_debug = -1; */
 836         hid_dev = kmalloc(sizeof(struct hid_device), GFP_KERNEL);
 837
 838         if (hid_parse_report(hid_dev, packet, len)) {
 839                 DPRINT_INFO(INPUTVSC_DRV, "Unable to call hd_parse_report");
 840                 return;
 841         }
 842
 843         if (hid_dev) {
 844                 DPRINT_INFO(INPUTVSC_DRV, "hid_device created");
 845
 846                 hid_dev->ll_driver->open  = mousevsc_hid_open;
 847                 hid_dev->ll_driver->close = mousevsc_hid_close;
 848
 849                 hid_dev->bus = BUS_VIRTUAL;
 850                 hid_dev->vendor = input_device_ctx->device_info.vendor;
 851                 hid_dev->product = input_device_ctx->device_info.product;
 852                 hid_dev->version = input_device_ctx->device_info.version;
 853                 hid_dev->dev = dev->device;
 854
 855                 sprintf(hid_dev->name, "%s",
 856                         input_device_ctx->device_info.name);
 857
 858                 /*
 859                  * HJ Do we want to call it with a 0
 860                  */
 861                 if (!hidinput_connect(hid_dev, 0)) {
 862                         hid_dev->claimed |= HID_CLAIMED_INPUT;
 863
 864                         input_device_ctx->connected = 1;
 865
 866                         DPRINT_INFO(INPUTVSC_DRV,
 867                                      "HID device claimed by input\n");
 868                 }
 869
 870                 if (!hid_dev->claimed) {
 871                         DPRINT_ERR(INPUTVSC_DRV,
 872                                     "HID device not claimed by "
 873                                     "input or hiddev\n");
 874                 }
 875
 876                 input_device_ctx->hid_device = hid_dev;
 877         }
 878
 879         kfree(hid_dev);
 880 }
 881
 882 static const struct hv_vmbus_device_id id_table[] = {
 883         /* Mouse guid */
 884         { VMBUS_DEVICE(0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
 885                        0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A) },
 886         { },
 887 };
 888
 889 /*
 890  * The mouse driver is not functional; do not auto-load it.
 891  */
 892 /* MODULE_DEVICE_TABLE(vmbus, id_table); */
 893
 894 static struct  hv_driver mousevsc_drv = {
 895         .name = "mousevsc",
 896         .id_table = id_table,
 897         .probe = mousevsc_probe,
 898         .remove = mousevsc_remove,
 899 };
 900
 901 static int __init mousevsc_init(void)
 902 {
 903         return vmbus_driver_register(&mousevsc_drv);
 904 }
 905
 906 static void __exit mousevsc_exit(void)
 907 {
 908         vmbus_driver_unregister(&mousevsc_drv);
 909 }
 910
 911 MODULE_LICENSE("GPL");
 912 MODULE_VERSION(HV_DRV_VERSION);
 913 module_init(mousevsc_init);
 914 module_exit(mousevsc_exit);
 915