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 #include <linux/pci.h>
  26 #include <linux/dmi.h>
  27
  28 #include "hyperv.h"
  29
  30
  31 /*
  32  * Data types
  33  */
  34 struct hv_input_dev_info {
  35         unsigned short vendor;
  36         unsigned short product;
  37         unsigned short version;
  38         char name[128];
  39 };
  40
  41 /* The maximum size of a synthetic input message. */
  42 #define SYNTHHID_MAX_INPUT_REPORT_SIZE 16
  43
  44 /*
  45  * Current version
  46  *
  47  * History:
  48  * Beta, RC < 2008/1/22        1,0
  49  * RC > 2008/1/22              2,0
  50  */
  51 #define SYNTHHID_INPUT_VERSION_MAJOR    2
  52 #define SYNTHHID_INPUT_VERSION_MINOR    0
  53 #define SYNTHHID_INPUT_VERSION          (SYNTHHID_INPUT_VERSION_MINOR | \
  54                                          (SYNTHHID_INPUT_VERSION_MAJOR << 16))
  55
  56
  57 #pragma pack(push,1)
  58 /*
  59  * Message types in the synthetic input protocol
  60  */
  61 enum synthhid_msg_type {
  62         SynthHidProtocolRequest,
  63         SynthHidProtocolResponse,
  64         SynthHidInitialDeviceInfo,
  65         SynthHidInitialDeviceInfoAck,
  66         SynthHidInputReport,
  67         SynthHidMax
  68 };
  69
  70 /*
  71  * Basic message structures.
  72  */
  73 struct synthhid_msg_hdr {
  74         enum synthhid_msg_type type;
  75         u32 size;
  76 };
  77
  78 struct synthhid_msg {
  79         struct synthhid_msg_hdr header;
  80         char data[1]; /* Enclosed message */
  81 };
  82
  83 union synthhid_version {
  84         struct {
  85                 u16 minor_version;
  86                 u16 major_version;
  87         };
  88         u32 version;
  89 };
  90
  91 /*
  92  * Protocol messages
  93  */
  94 struct synthhid_protocol_request {
  95         struct synthhid_msg_hdr header;
  96         union synthhid_version version_requested;
  97 };
  98
  99 struct synthhid_protocol_response {
 100         struct synthhid_msg_hdr header;
 101         union synthhid_version version_requested;
 102         unsigned char approved;
 103 };
 104
 105 struct synthhid_device_info {
 106         struct synthhid_msg_hdr header;
 107         struct hv_input_dev_info hid_dev_info;
 108         struct hid_descriptor hid_descriptor;
 109 };
 110
 111 struct synthhid_device_info_ack {
 112         struct synthhid_msg_hdr header;
 113         unsigned char reserved;
 114 };
 115
 116 struct synthhid_input_report {
 117         struct synthhid_msg_hdr header;
 118         char buffer[1];
 119 };
 120
 121 #pragma pack(pop)
 122
 123 #define INPUTVSC_SEND_RING_BUFFER_SIZE          10*PAGE_SIZE
 124 #define INPUTVSC_RECV_RING_BUFFER_SIZE          10*PAGE_SIZE
 125
 126 #define NBITS(x) (((x)/BITS_PER_LONG)+1)
 127
 128 enum pipe_prot_msg_type {
 129         PipeMessageInvalid = 0,
 130         PipeMessageData,
 131         PipeMessageMaximum
 132 };
 133
 134
 135 struct pipe_prt_msg {
 136         enum pipe_prot_msg_type type;
 137         u32 size;
 138         char data[1];
 139 };
 140
 141 /*
 142  * Data types
 143  */
 144 struct  mousevsc_prt_msg {
 145         enum pipe_prot_msg_type type;
 146         u32 size;
 147         union {
 148                 struct synthhid_protocol_request request;
 149                 struct synthhid_protocol_response response;
 150                 struct synthhid_device_info_ack ack;
 151         };
 152 };
 153
 154 /*
 155  * Represents an mousevsc device
 156  */
 157 struct mousevsc_dev {
 158         struct hv_device        *device;
 159         /* 0 indicates the device is being destroyed */
 160         atomic_t                ref_count;
 161         int                     num_outstanding_req;
 162         unsigned char           init_complete;
 163         struct mousevsc_prt_msg protocol_req;
 164         struct mousevsc_prt_msg protocol_resp;
 165         /* Synchronize the request/response if needed */
 166         wait_queue_head_t       protocol_wait_event;
 167         wait_queue_head_t       dev_info_wait_event;
 168         int                     protocol_wait_condition;
 169         int                     device_wait_condition;
 170         int                     dev_info_status;
 171
 172         struct hid_descriptor   *hid_desc;
 173         unsigned char           *report_desc;
 174         u32                     report_desc_size;
 175         struct hv_input_dev_info hid_dev_info;
 176 };
 177
 178
 179 static const char *driver_name = "mousevsc";
 180
 181 /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
 182 static const struct hv_guid mouse_guid = {
 183         .data = {0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
 184                  0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A}
 185 };
 186
 187 static void deviceinfo_callback(struct hv_device *dev, struct hv_input_dev_info *info);
 188 static void inputreport_callback(struct hv_device *dev, void *packet, u32 len);
 189 static void reportdesc_callback(struct hv_device *dev, void *packet, u32 len);
 190
 191 static struct mousevsc_dev *alloc_input_device(struct hv_device *device)
 192 {
 193         struct mousevsc_dev *input_dev;
 194
 195         input_dev = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);
 196
 197         if (!input_dev)
 198                 return NULL;
 199
 200         /*
 201          * Set to 2 to allow both inbound and outbound traffics
 202          * (ie get_input_device() and must_get_input_device()) to proceed.
 203          */
 204         atomic_cmpxchg(&input_dev->ref_count, 0, 2);
 205
 206         input_dev->device = device;
 207         device->ext = input_dev;
 208
 209         return input_dev;
 210 }
 211
 212 static void free_input_device(struct mousevsc_dev *device)
 213 {
 214         WARN_ON(atomic_read(&device->ref_count) == 0);
 215         kfree(device);
 216 }
 217
 218 /*
 219  * Get the inputdevice object if exists and its refcount > 1
 220  */
 221 static struct mousevsc_dev *get_input_device(struct hv_device *device)
 222 {
 223         struct mousevsc_dev *input_dev;
 224
 225         input_dev = (struct mousevsc_dev *)device->ext;
 226
 227 /*
 228  *      FIXME
 229  *      This sure isn't a valid thing to print for debugging, no matter
 230  *      what the intention is...
 231  *
 232  *      printk(KERN_ERR "-------------------------> REFCOUNT = %d",
 233  *             input_dev->ref_count);
 234  */
 235
 236         if (input_dev && atomic_read(&input_dev->ref_count) > 1)
 237                 atomic_inc(&input_dev->ref_count);
 238         else
 239                 input_dev = NULL;
 240
 241         return input_dev;
 242 }
 243
 244 /*
 245  * Get the inputdevice object iff exists and its refcount > 0
 246  */
 247 static struct mousevsc_dev *must_get_input_device(struct hv_device *device)
 248 {
 249         struct mousevsc_dev *input_dev;
 250
 251         input_dev = (struct mousevsc_dev *)device->ext;
 252
 253         if (input_dev && atomic_read(&input_dev->ref_count))
 254                 atomic_inc(&input_dev->ref_count);
 255         else
 256                 input_dev = NULL;
 257
 258         return input_dev;
 259 }
 260
 261 static void put_input_device(struct hv_device *device)
 262 {
 263         struct mousevsc_dev *input_dev;
 264
 265         input_dev = (struct mousevsc_dev *)device->ext;
 266
 267         atomic_dec(&input_dev->ref_count);
 268 }
 269
 270 /*
 271  * Drop ref count to 1 to effectively disable get_input_device()
 272  */
 273 static struct mousevsc_dev *release_input_device(struct hv_device *device)
 274 {
 275         struct mousevsc_dev *input_dev;
 276
 277         input_dev = (struct mousevsc_dev *)device->ext;
 278
 279         /* Busy wait until the ref drop to 2, then set it to 1  */
 280         while (atomic_cmpxchg(&input_dev->ref_count, 2, 1) != 2)
 281                 udelay(100);
 282
 283         return input_dev;
 284 }
 285
 286 /*
 287  * Drop ref count to 0. No one can use input_device object.
 288  */
 289 static struct mousevsc_dev *final_release_input_device(struct hv_device *device)
 290 {
 291         struct mousevsc_dev *input_dev;
 292
 293         input_dev = (struct mousevsc_dev *)device->ext;
 294
 295         /* Busy wait until the ref drop to 1, then set it to 0  */
 296         while (atomic_cmpxchg(&input_dev->ref_count, 1, 0) != 1)
 297                 udelay(100);
 298
 299         device->ext = NULL;
 300         return input_dev;
 301 }
 302
 303 static void mousevsc_on_send_completion(struct hv_device *device,
 304                                         struct vmpacket_descriptor *packet)
 305 {
 306         struct mousevsc_dev *input_dev;
 307         void *request;
 308
 309         input_dev = must_get_input_device(device);
 310         if (!input_dev) {
 311                 pr_err("unable to get input device...device being destroyed?");
 312                 return;
 313         }
 314
 315         request = (void *)(unsigned long)packet->trans_id;
 316
 317         if (request == &input_dev->protocol_req) {
 318                 /* FIXME */
 319                 /* Shouldn't we be doing something here? */
 320         }
 321
 322         put_input_device(device);
 323 }
 324
 325 static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
 326                                 struct synthhid_device_info *device_info)
 327 {
 328         int ret = 0;
 329         struct hid_descriptor *desc;
 330         struct mousevsc_prt_msg ack;
 331
 332         /* Assume success for now */
 333         input_device->dev_info_status = 0;
 334
 335         /* Save the device attr */
 336         memcpy(&input_device->hid_dev_info, &device_info->hid_dev_info,
 337                 sizeof(struct hv_input_dev_info));
 338
 339         /* Save the hid desc */
 340         desc = &device_info->hid_descriptor;
 341         WARN_ON(desc->bLength > 0);
 342
 343         input_device->hid_desc = kzalloc(desc->bLength, GFP_KERNEL);
 344
 345         if (!input_device->hid_desc) {
 346                 pr_err("unable to allocate hid descriptor - size %d", desc->bLength);
 347                 goto Cleanup;
 348         }
 349
 350         memcpy(input_device->hid_desc, desc, desc->bLength);
 351
 352         /* Save the report desc */
 353         input_device->report_desc_size = desc->desc[0].wDescriptorLength;
 354         input_device->report_desc = kzalloc(input_device->report_desc_size,
 355                                           GFP_KERNEL);
 356
 357         if (!input_device->report_desc) {
 358                 pr_err("unable to allocate report descriptor - size %d",
 359                            input_device->report_desc_size);
 360                 goto Cleanup;
 361         }
 362
 363         memcpy(input_device->report_desc,
 364                ((unsigned char *)desc) + desc->bLength,
 365                desc->desc[0].wDescriptorLength);
 366
 367         /* Send the ack */
 368         memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
 369
 370         ack.type = PipeMessageData;
 371         ack.size = sizeof(struct synthhid_device_info_ack);
 372
 373         ack.ack.header.type = SynthHidInitialDeviceInfoAck;
 374         ack.ack.header.size = 1;
 375         ack.ack.reserved = 0;
 376
 377         ret = vmbus_sendpacket(input_device->device->channel,
 378                         &ack,
 379                         sizeof(struct pipe_prt_msg) - sizeof(unsigned char) +
 380                         sizeof(struct synthhid_device_info_ack),
 381                         (unsigned long)&ack,
 382                         VM_PKT_DATA_INBAND,
 383                         VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 384         if (ret != 0) {
 385                 pr_err("unable to send synthhid device info ack - ret %d",
 386                            ret);
 387                 goto Cleanup;
 388         }
 389
 390         input_device->device_wait_condition = 1;
 391         wake_up(&input_device->dev_info_wait_event);
 392
 393         return;
 394
 395 Cleanup:
 396         kfree(input_device->hid_desc);
 397         input_device->hid_desc = NULL;
 398
 399         kfree(input_device->report_desc);
 400         input_device->report_desc = NULL;
 401
 402         input_device->dev_info_status = -1;
 403         input_device->device_wait_condition = 1;
 404         wake_up(&input_device->dev_info_wait_event);
 405 }
 406
 407 static void mousevsc_on_receive_input_report(struct mousevsc_dev *input_device,
 408                                 struct synthhid_input_report *input_report)
 409 {
 410         struct hv_driver *input_drv;
 411
 412         if (!input_device->init_complete) {
 413                 pr_info("Initialization incomplete...ignoring input_report msg");
 414                 return;
 415         }
 416
 417         input_drv = drv_to_hv_drv(input_device->device->device.driver);
 418
 419         inputreport_callback(input_device->device,
 420                              input_report->buffer,
 421                              input_report->header.size);
 422 }
 423
 424 static void mousevsc_on_receive(struct hv_device *device,
 425                                 struct vmpacket_descriptor *packet)
 426 {
 427         struct pipe_prt_msg *pipe_msg;
 428         struct synthhid_msg *hid_msg;
 429         struct mousevsc_dev *input_dev;
 430
 431         input_dev = must_get_input_device(device);
 432         if (!input_dev) {
 433                 pr_err("unable to get input device...device being destroyed?");
 434                 return;
 435         }
 436
 437         pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
 438                                                 (packet->offset8 << 3));
 439
 440         if (pipe_msg->type != PipeMessageData) {
 441                 pr_err("unknown pipe msg type - type %d len %d",
 442                            pipe_msg->type, pipe_msg->size);
 443                 put_input_device(device);
 444                 return ;
 445         }
 446
 447         hid_msg = (struct synthhid_msg *)&pipe_msg->data[0];
 448
 449         switch (hid_msg->header.type) {
 450         case SynthHidProtocolResponse:
 451                 memcpy(&input_dev->protocol_resp, pipe_msg,
 452                        pipe_msg->size + sizeof(struct pipe_prt_msg) -
 453                        sizeof(unsigned char));
 454                 input_dev->protocol_wait_condition = 1;
 455                 wake_up(&input_dev->protocol_wait_event);
 456                 break;
 457
 458         case SynthHidInitialDeviceInfo:
 459                 WARN_ON(pipe_msg->size >= sizeof(struct hv_input_dev_info));
 460
 461                 /*
 462                  * Parse out the device info into device attr,
 463                  * hid desc and report desc
 464                  */
 465                 mousevsc_on_receive_device_info(input_dev,
 466                         (struct synthhid_device_info *)&pipe_msg->data[0]);
 467                 break;
 468         case SynthHidInputReport:
 469                 mousevsc_on_receive_input_report(input_dev,
 470                         (struct synthhid_input_report *)&pipe_msg->data[0]);
 471
 472                 break;
 473         default:
 474                 pr_err("unsupported hid msg type - type %d len %d",
 475                        hid_msg->header.type, hid_msg->header.size);
 476                 break;
 477         }
 478
 479         put_input_device(device);
 480 }
 481
 482 static void mousevsc_on_channel_callback(void *context)
 483 {
 484         const int packetSize = 0x100;
 485         int ret = 0;
 486         struct hv_device *device = (struct hv_device *)context;
 487         struct mousevsc_dev *input_dev;
 488
 489         u32 bytes_recvd;
 490         u64 req_id;
 491         unsigned char packet[0x100];
 492         struct vmpacket_descriptor *desc;
 493         unsigned char   *buffer = packet;
 494         int     bufferlen = packetSize;
 495
 496         input_dev = must_get_input_device(device);
 497
 498         if (!input_dev) {
 499                 pr_err("unable to get input device...device being destroyed?");
 500                 return;
 501         }
 502
 503         do {
 504                 ret = vmbus_recvpacket_raw(device->channel, buffer,
 505                                         bufferlen, &bytes_recvd, &req_id);
 506
 507                 if (ret == 0) {
 508                         if (bytes_recvd > 0) {
 509                                 desc = (struct vmpacket_descriptor *)buffer;
 510
 511                                 switch (desc->type) {
 512                                         case VM_PKT_COMP:
 513                                                 mousevsc_on_send_completion(
 514                                                         device, desc);
 515                                                 break;
 516
 517                                         case VM_PKT_DATA_INBAND:
 518                                                 mousevsc_on_receive(
 519                                                         device, desc);
 520                                                 break;
 521
 522                                         default:
 523                                                 pr_err("unhandled packet type %d, tid %llx len %d\n",
 524                                                            desc->type,
 525                                                            req_id,
 526                                                            bytes_recvd);
 527                                                 break;
 528                                 }
 529
 530                                 /* reset */
 531                                 if (bufferlen > packetSize) {
 532                                         kfree(buffer);
 533
 534                                         buffer = packet;
 535                                         bufferlen = packetSize;
 536                                 }
 537                         } else {
 538                                 /*
 539                                  * pr_debug("nothing else to read...");
 540                                  * reset
 541                                  */
 542                                 if (bufferlen > packetSize) {
 543                                         kfree(buffer);
 544
 545                                         buffer = packet;
 546                                         bufferlen = packetSize;
 547                                 }
 548                                 break;
 549                         }
 550                 } else if (ret == -2) {
 551                         /* Handle large packet */
 552                         bufferlen = bytes_recvd;
 553                         buffer = kzalloc(bytes_recvd, GFP_KERNEL);
 554
 555                         if (buffer == NULL) {
 556                                 buffer = packet;
 557                                 bufferlen = packetSize;
 558
 559                                 /* Try again next time around */
 560                                 pr_err("unable to allocate buffer of size %d!",
 561                                        bytes_recvd);
 562                                 break;
 563                         }
 564                 }
 565         } while (1);
 566
 567         put_input_device(device);
 568
 569         return;
 570 }
 571
 572 static int mousevsc_connect_to_vsp(struct hv_device *device)
 573 {
 574         int ret = 0;
 575         struct mousevsc_dev *input_dev;
 576         struct mousevsc_prt_msg *request;
 577         struct mousevsc_prt_msg *response;
 578
 579         input_dev = get_input_device(device);
 580
 581         if (!input_dev) {
 582                 pr_err("unable to get input device...device being destroyed?");
 583                 return -1;
 584         }
 585
 586         init_waitqueue_head(&input_dev->protocol_wait_event);
 587         init_waitqueue_head(&input_dev->dev_info_wait_event);
 588
 589         request = &input_dev->protocol_req;
 590
 591         /*
 592          * Now, initiate the vsc/vsp initialization protocol on the open channel
 593          */
 594         memset(request, 0, sizeof(struct mousevsc_prt_msg));
 595
 596         request->type = PipeMessageData;
 597         request->size = sizeof(struct synthhid_protocol_request);
 598
 599         request->request.header.type = SynthHidProtocolRequest;
 600         request->request.header.size = sizeof(unsigned long);
 601         request->request.version_requested.version = SYNTHHID_INPUT_VERSION;
 602
 603         pr_info("synthhid protocol request...");
 604
 605         ret = vmbus_sendpacket(device->channel, request,
 606                                         sizeof(struct pipe_prt_msg) -
 607                                         sizeof(unsigned char) +
 608                                         sizeof(struct synthhid_protocol_request),
 609                                         (unsigned long)request,
 610                                         VM_PKT_DATA_INBAND,
 611                                         VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 612         if (ret != 0) {
 613                 pr_err("unable to send synthhid protocol request.");
 614                 goto Cleanup;
 615         }
 616
 617         input_dev->protocol_wait_condition = 0;
 618         wait_event_timeout(input_dev->protocol_wait_event,
 619                 input_dev->protocol_wait_condition, msecs_to_jiffies(1000));
 620         if (input_dev->protocol_wait_condition == 0) {
 621                 ret = -ETIMEDOUT;
 622                 goto Cleanup;
 623         }
 624
 625         response = &input_dev->protocol_resp;
 626
 627         if (!response->response.approved) {
 628                 pr_err("synthhid protocol request failed (version %d)",
 629                        SYNTHHID_INPUT_VERSION);
 630                 ret = -1;
 631                 goto Cleanup;
 632         }
 633
 634         input_dev->device_wait_condition = 0;
 635         wait_event_timeout(input_dev->dev_info_wait_event,
 636                 input_dev->device_wait_condition, msecs_to_jiffies(1000));
 637         if (input_dev->device_wait_condition == 0) {
 638                 ret = -ETIMEDOUT;
 639                 goto Cleanup;
 640         }
 641
 642         /*
 643          * We should have gotten the device attr, hid desc and report
 644          * desc at this point
 645          */
 646         if (!input_dev->dev_info_status)
 647                 pr_info("**** input channel up and running!! ****");
 648         else
 649                 ret = -1;
 650
 651 Cleanup:
 652         put_input_device(device);
 653
 654         return ret;
 655 }
 656
 657 static int mousevsc_on_device_add(struct hv_device *device,
 658                                         void *additional_info)
 659 {
 660         int ret = 0;
 661         struct mousevsc_dev *input_dev;
 662         struct hv_driver *input_drv;
 663         struct hv_input_dev_info dev_info;
 664
 665         input_dev = alloc_input_device(device);
 666
 667         if (!input_dev) {
 668                 ret = -1;
 669                 goto Cleanup;
 670         }
 671
 672         input_dev->init_complete = false;
 673
 674         /* Open the channel */
 675         ret = vmbus_open(device->channel,
 676                 INPUTVSC_SEND_RING_BUFFER_SIZE,
 677                 INPUTVSC_RECV_RING_BUFFER_SIZE,
 678                 NULL,
 679                 0,
 680                 mousevsc_on_channel_callback,
 681                 device
 682                 );
 683
 684         if (ret != 0) {
 685                 pr_err("unable to open channel: %d", ret);
 686                 free_input_device(input_dev);
 687                 return -1;
 688         }
 689
 690         pr_info("InputVsc channel open: %d", ret);
 691
 692         ret = mousevsc_connect_to_vsp(device);
 693
 694         if (ret != 0) {
 695                 pr_err("unable to connect channel: %d", ret);
 696
 697                 vmbus_close(device->channel);
 698                 free_input_device(input_dev);
 699                 return ret;
 700         }
 701
 702         input_drv = drv_to_hv_drv(input_dev->device->device.driver);
 703
 704         dev_info.vendor = input_dev->hid_dev_info.vendor;
 705         dev_info.product = input_dev->hid_dev_info.product;
 706         dev_info.version = input_dev->hid_dev_info.version;
 707         strcpy(dev_info.name, "Microsoft Vmbus HID-compliant Mouse");
 708
 709         /* Send the device info back up */
 710         deviceinfo_callback(device, &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 /*
 766  * Data types
 767  */
 768 struct input_device_context {
 769         struct hv_device        *device_ctx;
 770         struct hid_device       *hid_device;
 771         struct hv_input_dev_info device_info;
 772         int                     connected;
 773 };
 774
 775
 776 static void deviceinfo_callback(struct hv_device *dev, struct hv_input_dev_info *info)
 777 {
 778         struct input_device_context *input_device_ctx =
 779                 dev_get_drvdata(&dev->device);
 780
 781         memcpy(&input_device_ctx->device_info, info,
 782                sizeof(struct hv_input_dev_info));
 783
 784         DPRINT_INFO(INPUTVSC_DRV, "%s", __func__);
 785 }
 786
 787 static void inputreport_callback(struct hv_device *dev, void *packet, u32 len)
 788 {
 789         int ret = 0;
 790
 791         struct input_device_context *input_dev_ctx =
 792                 dev_get_drvdata(&dev->device);
 793
 794         ret = hid_input_report(input_dev_ctx->hid_device,
 795                               HID_INPUT_REPORT, packet, len, 1);
 796
 797         DPRINT_DBG(INPUTVSC_DRV, "hid_input_report (ret %d)", ret);
 798 }
 799
 800 static int mousevsc_hid_open(struct hid_device *hid)
 801 {
 802         return 0;
 803 }
 804
 805 static void mousevsc_hid_close(struct hid_device *hid)
 806 {
 807 }
 808
 809 static int mousevsc_probe(struct hv_device *dev)
 810 {
 811         int ret = 0;
 812
 813         struct input_device_context *input_dev_ctx;
 814
 815         input_dev_ctx = kmalloc(sizeof(struct input_device_context),
 816                                 GFP_KERNEL);
 817
 818         dev_set_drvdata(&dev->device, input_dev_ctx);
 819
 820         /* Call to the vsc driver to add the device */
 821         ret = mousevsc_on_device_add(dev, NULL);
 822
 823         if (ret != 0) {
 824                 DPRINT_ERR(INPUTVSC_DRV, "unable to add input vsc device");
 825
 826                 return -1;
 827         }
 828
 829         return 0;
 830 }
 831
 832 static int mousevsc_remove(struct hv_device *dev)
 833 {
 834         int ret = 0;
 835
 836         struct input_device_context *input_dev_ctx;
 837
 838         input_dev_ctx = kmalloc(sizeof(struct input_device_context),
 839                                 GFP_KERNEL);
 840
 841         dev_set_drvdata(&dev->device, input_dev_ctx);
 842
 843         if (input_dev_ctx->connected) {
 844                 hidinput_disconnect(input_dev_ctx->hid_device);
 845                 input_dev_ctx->connected = 0;
 846         }
 847
 848         /*
 849          * Call to the vsc driver to let it know that the device
 850          * is being removed
 851          */
 852         ret = mousevsc_on_device_remove(dev);
 853
 854         if (ret != 0) {
 855                 DPRINT_ERR(INPUTVSC_DRV,
 856                            "unable to remove vsc device (ret %d)", ret);
 857         }
 858
 859         kfree(input_dev_ctx);
 860
 861         return ret;
 862 }
 863
 864 static void reportdesc_callback(struct hv_device *dev, void *packet, u32 len)
 865 {
 866         struct input_device_context *input_device_ctx =
 867                 dev_get_drvdata(&dev->device);
 868         struct hid_device *hid_dev;
 869
 870         /* hid_debug = -1; */
 871         hid_dev = kmalloc(sizeof(struct hid_device), GFP_KERNEL);
 872
 873         if (hid_parse_report(hid_dev, packet, len)) {
 874                 DPRINT_INFO(INPUTVSC_DRV, "Unable to call hd_parse_report");
 875                 return;
 876         }
 877
 878         if (hid_dev) {
 879                 DPRINT_INFO(INPUTVSC_DRV, "hid_device created");
 880
 881                 hid_dev->ll_driver->open  = mousevsc_hid_open;
 882                 hid_dev->ll_driver->close = mousevsc_hid_close;
 883
 884                 hid_dev->bus = BUS_VIRTUAL;
 885                 hid_dev->vendor = input_device_ctx->device_info.vendor;
 886                 hid_dev->product = input_device_ctx->device_info.product;
 887                 hid_dev->version = input_device_ctx->device_info.version;
 888                 hid_dev->dev = dev->device;
 889
 890                 sprintf(hid_dev->name, "%s",
 891                         input_device_ctx->device_info.name);
 892
 893                 /*
 894                  * HJ Do we want to call it with a 0
 895                  */
 896                 if (!hidinput_connect(hid_dev, 0)) {
 897                         hid_dev->claimed |= HID_CLAIMED_INPUT;
 898
 899                         input_device_ctx->connected = 1;
 900
 901                         DPRINT_INFO(INPUTVSC_DRV,
 902                                      "HID device claimed by input\n");
 903                 }
 904
 905                 if (!hid_dev->claimed) {
 906                         DPRINT_ERR(INPUTVSC_DRV,
 907                                     "HID device not claimed by "
 908                                     "input or hiddev\n");
 909                 }
 910
 911                 input_device_ctx->hid_device = hid_dev;
 912         }
 913
 914         kfree(hid_dev);
 915 }
 916
 917
 918 static struct  hv_driver mousevsc_drv = {
 919         .probe = mousevsc_probe,
 920         .remove = mousevsc_remove,
 921 };
 922
 923 static void mousevsc_drv_exit(void)
 924 {
 925         vmbus_child_driver_unregister(&mousevsc_drv.driver);
 926 }
 927
 928 static int __init mousevsc_init(void)
 929 {
 930         struct hv_driver *drv = &mousevsc_drv;
 931
 932         DPRINT_INFO(INPUTVSC_DRV, "Hyper-V Mouse driver initializing.");
 933
 934         memcpy(&drv->dev_type, &mouse_guid,
 935                sizeof(struct hv_guid));
 936
 937         drv->driver.name = driver_name;
 938
 939         /* The driver belongs to vmbus */
 940         vmbus_child_driver_register(&drv->driver);
 941
 942         return 0;
 943 }
 944
 945 static void __exit mousevsc_exit(void)
 946 {
 947         mousevsc_drv_exit();
 948 }
 949
 950 /*
 951  * We don't want to automatically load this driver just yet, it's quite
 952  * broken.  It's safe if you want to load it yourself manually, but
 953  * don't inflict it on unsuspecting users, that's just mean.
 954  */
 955 #if 0
 956
 957 /*
 958  * We use a PCI table to determine if we should autoload this driver  This is
 959  * needed by distro tools to determine if the hyperv drivers should be
 960  * installed and/or configured.  We don't do anything else with the table, but
 961  * it needs to be present.
 962  */
 963 const static struct pci_device_id microsoft_hv_pci_table[] = {
 964         { PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
 965         { 0 }
 966 };
 967 MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
 968 #endif
 969
 970 MODULE_LICENSE("GPL");
 971 MODULE_VERSION(HV_DRV_VERSION);
 972 module_init(mousevsc_init);
 973 module_exit(mousevsc_exit);
 974