sound/pci/asihpi/hpioctl.c

   1 /*******************************************************************************
   2     AudioScience HPI driver
   3     Common Linux HPI ioctl and module probe/remove functions
   4
   5     Copyright (C) 1997-2014  AudioScience Inc. <support@audioscience.com>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of version 2 of the GNU General Public License as
   9     published by the Free Software Foundation;
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16 *******************************************************************************/
  17 #define SOURCEFILE_NAME "hpioctl.c"
  18
  19 #include "hpi_internal.h"
  20 #include "hpi_version.h"
  21 #include "hpimsginit.h"
  22 #include "hpidebug.h"
  23 #include "hpimsgx.h"
  24 #include "hpioctl.h"
  25 #include "hpicmn.h"
  26
  27 #include <linux/fs.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/slab.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/pci.h>
  33 #include <linux/stringify.h>
  34 #include <linux/module.h>
  35 #include <linux/vmalloc.h>
  36
  37 #ifdef MODULE_FIRMWARE
  38 MODULE_FIRMWARE("asihpi/dsp5000.bin");
  39 MODULE_FIRMWARE("asihpi/dsp6200.bin");
  40 MODULE_FIRMWARE("asihpi/dsp6205.bin");
  41 MODULE_FIRMWARE("asihpi/dsp6400.bin");
  42 MODULE_FIRMWARE("asihpi/dsp6600.bin");
  43 MODULE_FIRMWARE("asihpi/dsp8700.bin");
  44 MODULE_FIRMWARE("asihpi/dsp8900.bin");
  45 #endif
  46
  47 static int prealloc_stream_buf;
  48 module_param(prealloc_stream_buf, int, S_IRUGO);
  49 MODULE_PARM_DESC(prealloc_stream_buf,
  50         "Preallocate size for per-adapter stream buffer");
  51
  52 /* Allow the debug level to be changed after module load.
  53  E.g.   echo 2 > /sys/module/asihpi/parameters/hpiDebugLevel
  54 */
  55 module_param(hpi_debug_level, int, S_IRUGO | S_IWUSR);
  56 MODULE_PARM_DESC(hpi_debug_level, "debug verbosity 0..5");
  57
  58 /* List of adapters found */
  59 static struct hpi_adapter adapters[HPI_MAX_ADAPTERS];
  60
  61 /* Wrapper function to HPI_Message to enable dumping of the
  62    message and response types.
  63 */
  64 static void hpi_send_recv_f(struct hpi_message *phm, struct hpi_response *phr,
  65         struct file *file)
  66 {
  67         if ((phm->adapter_index >= HPI_MAX_ADAPTERS)
  68                 && (phm->object != HPI_OBJ_SUBSYSTEM))
  69                 phr->error = HPI_ERROR_INVALID_OBJ_INDEX;
  70         else
  71                 hpi_send_recv_ex(phm, phr, file);
  72 }
  73
  74 /* This is called from hpifunc.c functions, called by ALSA
  75  * (or other kernel process) In this case there is no file descriptor
  76  * available for the message cache code
  77  */
  78 void hpi_send_recv(struct hpi_message *phm, struct hpi_response *phr)
  79 {
  80         hpi_send_recv_f(phm, phr, HOWNER_KERNEL);
  81 }
  82
  83 EXPORT_SYMBOL(hpi_send_recv);
  84 /* for radio-asihpi */
  85
  86 int asihpi_hpi_release(struct file *file)
  87 {
  88         struct hpi_message hm;
  89         struct hpi_response hr;
  90
  91 /* HPI_DEBUG_LOG(INFO,"hpi_release file %p, pid %d\n", file, current->pid); */
  92         /* close the subsystem just in case the application forgot to. */
  93         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
  94                 HPI_SUBSYS_CLOSE);
  95         hpi_send_recv_ex(&hm, &hr, file);
  96         return 0;
  97 }
  98
  99 long asihpi_hpi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 100 {
 101         struct hpi_ioctl_linux __user *phpi_ioctl_data;
 102         void __user *puhm;
 103         void __user *puhr;
 104         union hpi_message_buffer_v1 *hm;
 105         union hpi_response_buffer_v1 *hr;
 106         u16 msg_size;
 107         u16 res_max_size;
 108         u32 uncopied_bytes;
 109         int err = 0;
 110
 111         if (cmd != HPI_IOCTL_LINUX)
 112                 return -EINVAL;
 113
 114         hm = kmalloc(sizeof(*hm), GFP_KERNEL);
 115         hr = kzalloc(sizeof(*hr), GFP_KERNEL);
 116         if (!hm || !hr) {
 117                 err = -ENOMEM;
 118                 goto out;
 119         }
 120
 121         phpi_ioctl_data = (struct hpi_ioctl_linux __user *)arg;
 122
 123         /* Read the message and response pointers from user space.  */
 124         if (get_user(puhm, &phpi_ioctl_data->phm)
 125                 || get_user(puhr, &phpi_ioctl_data->phr)) {
 126                 err = -EFAULT;
 127                 goto out;
 128         }
 129
 130         /* Now read the message size and data from user space.  */
 131         if (get_user(msg_size, (u16 __user *)puhm)) {
 132                 err = -EFAULT;
 133                 goto out;
 134         }
 135         if (msg_size > sizeof(*hm))
 136                 msg_size = sizeof(*hm);
 137
 138         /* printk(KERN_INFO "message size %d\n", hm->h.wSize); */
 139
 140         uncopied_bytes = copy_from_user(hm, puhm, msg_size);
 141         if (uncopied_bytes) {
 142                 HPI_DEBUG_LOG(ERROR, "uncopied bytes %d\n", uncopied_bytes);
 143                 err = -EFAULT;
 144                 goto out;
 145         }
 146
 147         /* Override h.size in case it is changed between two userspace fetches */
 148         hm->h.size = msg_size;
 149
 150         if (get_user(res_max_size, (u16 __user *)puhr)) {
 151                 err = -EFAULT;
 152                 goto out;
 153         }
 154         /* printk(KERN_INFO "user response size %d\n", res_max_size); */
 155         if (res_max_size < sizeof(struct hpi_response_header)) {
 156                 HPI_DEBUG_LOG(WARNING, "small res size %d\n", res_max_size);
 157                 err = -EFAULT;
 158                 goto out;
 159         }
 160
 161         res_max_size = min_t(size_t, res_max_size, sizeof(*hr));
 162
 163         switch (hm->h.function) {
 164         case HPI_SUBSYS_CREATE_ADAPTER:
 165         case HPI_ADAPTER_DELETE:
 166                 /* Application must not use these functions! */
 167                 hr->h.size = sizeof(hr->h);
 168                 hr->h.error = HPI_ERROR_INVALID_OPERATION;
 169                 hr->h.function = hm->h.function;
 170                 uncopied_bytes = copy_to_user(puhr, hr, hr->h.size);
 171                 if (uncopied_bytes)
 172                         err = -EFAULT;
 173                 else
 174                         err = 0;
 175                 goto out;
 176         }
 177
 178         hr->h.size = res_max_size;
 179         if (hm->h.object == HPI_OBJ_SUBSYSTEM) {
 180                 hpi_send_recv_f(&hm->m0, &hr->r0, file);
 181         } else {
 182                 u16 __user *ptr = NULL;
 183                 u32 size = 0;
 184                 /* -1=no data 0=read from user mem, 1=write to user mem */
 185                 int wrflag = -1;
 186                 struct hpi_adapter *pa = NULL;
 187
 188                 if (hm->h.adapter_index < ARRAY_SIZE(adapters))
 189                         pa = &adapters[hm->h.adapter_index];
 190
 191                 if (!pa || !pa->adapter || !pa->adapter->type) {
 192                         hpi_init_response(&hr->r0, hm->h.object,
 193                                 hm->h.function, HPI_ERROR_BAD_ADAPTER_NUMBER);
 194
 195                         uncopied_bytes =
 196                                 copy_to_user(puhr, hr, sizeof(hr->h));
 197                         if (uncopied_bytes)
 198                                 err = -EFAULT;
 199                         else
 200                                 err = 0;
 201                         goto out;
 202                 }
 203
 204                 if (mutex_lock_interruptible(&pa->mutex)) {
 205                         err = -EINTR;
 206                         goto out;
 207                 }
 208
 209                 /* Dig out any pointers embedded in the message.  */
 210                 switch (hm->h.function) {
 211                 case HPI_OSTREAM_WRITE:
 212                 case HPI_ISTREAM_READ:{
 213                                 /* Yes, sparse, this is correct. */
 214                                 ptr = (u16 __user *)hm->m0.u.d.u.data.pb_data;
 215                                 size = hm->m0.u.d.u.data.data_size;
 216
 217                                 /* Allocate buffer according to application request.
 218                                    ?Is it better to alloc/free for the duration
 219                                    of the transaction?
 220                                  */
 221                                 if (pa->buffer_size < size) {
 222                                         HPI_DEBUG_LOG(DEBUG,
 223                                                 "Realloc adapter %d stream "
 224                                                 "buffer from %zd to %d\n",
 225                                                 hm->h.adapter_index,
 226                                                 pa->buffer_size, size);
 227                                         if (pa->p_buffer) {
 228                                                 pa->buffer_size = 0;
 229                                                 vfree(pa->p_buffer);
 230                                         }
 231                                         pa->p_buffer = vmalloc(size);
 232                                         if (pa->p_buffer)
 233                                                 pa->buffer_size = size;
 234                                         else {
 235                                                 HPI_DEBUG_LOG(ERROR,
 236                                                         "HPI could not allocate "
 237                                                         "stream buffer size %d\n",
 238                                                         size);
 239
 240                                                 mutex_unlock(&pa->mutex);
 241                                                 err = -EINVAL;
 242                                                 goto out;
 243                                         }
 244                                 }
 245
 246                                 hm->m0.u.d.u.data.pb_data = pa->p_buffer;
 247                                 if (hm->h.function == HPI_ISTREAM_READ)
 248                                         /* from card, WRITE to user mem */
 249                                         wrflag = 1;
 250                                 else
 251                                         wrflag = 0;
 252                                 break;
 253                         }
 254
 255                 default:
 256                         size = 0;
 257                         break;
 258                 }
 259
 260                 if (size && (wrflag == 0)) {
 261                         uncopied_bytes =
 262                                 copy_from_user(pa->p_buffer, ptr, size);
 263                         if (uncopied_bytes)
 264                                 HPI_DEBUG_LOG(WARNING,
 265                                         "Missed %d of %d "
 266                                         "bytes from user\n", uncopied_bytes,
 267                                         size);
 268                 }
 269
 270                 hpi_send_recv_f(&hm->m0, &hr->r0, file);
 271
 272                 if (size && (wrflag == 1)) {
 273                         uncopied_bytes =
 274                                 copy_to_user(ptr, pa->p_buffer, size);
 275                         if (uncopied_bytes)
 276                                 HPI_DEBUG_LOG(WARNING,
 277                                         "Missed %d of %d " "bytes to user\n",
 278                                         uncopied_bytes, size);
 279                 }
 280
 281                 mutex_unlock(&pa->mutex);
 282         }
 283
 284         /* on return response size must be set */
 285         /*printk(KERN_INFO "response size %d\n", hr->h.wSize); */
 286
 287         if (!hr->h.size) {
 288                 HPI_DEBUG_LOG(ERROR, "response zero size\n");
 289                 err = -EFAULT;
 290                 goto out;
 291         }
 292
 293         if (hr->h.size > res_max_size) {
 294                 HPI_DEBUG_LOG(ERROR, "response too big %d %d\n", hr->h.size,
 295                         res_max_size);
 296                 hr->h.error = HPI_ERROR_RESPONSE_BUFFER_TOO_SMALL;
 297                 hr->h.specific_error = hr->h.size;
 298                 hr->h.size = sizeof(hr->h);
 299         }
 300
 301         uncopied_bytes = copy_to_user(puhr, hr, hr->h.size);
 302         if (uncopied_bytes) {
 303                 HPI_DEBUG_LOG(ERROR, "uncopied bytes %d\n", uncopied_bytes);
 304                 err = -EFAULT;
 305                 goto out;
 306         }
 307
 308 out:
 309         kfree(hm);
 310         kfree(hr);
 311         return err;
 312 }
 313
 314 static int asihpi_irq_count;
 315
 316 static irqreturn_t asihpi_isr(int irq, void *dev_id)
 317 {
 318         struct hpi_adapter *a = dev_id;
 319         int handled;
 320
 321         if (!a->adapter->irq_query_and_clear) {
 322                 pr_err("asihpi_isr ASI%04X:%d no handler\n", a->adapter->type,
 323                         a->adapter->index);
 324                 return IRQ_NONE;
 325         }
 326
 327         handled = a->adapter->irq_query_and_clear(a->adapter, 0);
 328
 329         if (!handled)
 330                 return IRQ_NONE;
 331
 332         asihpi_irq_count++;
 333         /* printk(KERN_INFO "asihpi_isr %d ASI%04X:%d irq handled\n",
 334            asihpi_irq_count, a->adapter->type, a->adapter->index); */
 335
 336         if (a->interrupt_callback)
 337                 a->interrupt_callback(a);
 338
 339         return IRQ_HANDLED;
 340 }
 341
 342 int asihpi_adapter_probe(struct pci_dev *pci_dev,
 343                          const struct pci_device_id *pci_id)
 344 {
 345         int idx, nm, low_latency_mode = 0, irq_supported = 0;
 346         int adapter_index;
 347         unsigned int memlen;
 348         struct hpi_message hm;
 349         struct hpi_response hr;
 350         struct hpi_adapter adapter;
 351         struct hpi_pci pci;
 352
 353         memset(&adapter, 0, sizeof(adapter));
 354
 355         dev_printk(KERN_DEBUG, &pci_dev->dev,
 356                 "probe %04x:%04x,%04x:%04x,%04x\n", pci_dev->vendor,
 357                 pci_dev->device, pci_dev->subsystem_vendor,
 358                 pci_dev->subsystem_device, pci_dev->devfn);
 359
 360         if (pci_enable_device(pci_dev) < 0) {
 361                 dev_err(&pci_dev->dev,
 362                         "pci_enable_device failed, disabling device\n");
 363                 return -EIO;
 364         }
 365
 366         pci_set_master(pci_dev);        /* also sets latency timer if < 16 */
 367
 368         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
 369                 HPI_SUBSYS_CREATE_ADAPTER);
 370         hpi_init_response(&hr, HPI_OBJ_SUBSYSTEM, HPI_SUBSYS_CREATE_ADAPTER,
 371                 HPI_ERROR_PROCESSING_MESSAGE);
 372
 373         hm.adapter_index = HPI_ADAPTER_INDEX_INVALID;
 374
 375         nm = HPI_MAX_ADAPTER_MEM_SPACES;
 376
 377         for (idx = 0; idx < nm; idx++) {
 378                 HPI_DEBUG_LOG(INFO, "resource %d %pR\n", idx,
 379                         &pci_dev->resource[idx]);
 380
 381                 if (pci_resource_flags(pci_dev, idx) & IORESOURCE_MEM) {
 382                         memlen = pci_resource_len(pci_dev, idx);
 383                         pci.ap_mem_base[idx] =
 384                                 ioremap(pci_resource_start(pci_dev, idx),
 385                                 memlen);
 386                         if (!pci.ap_mem_base[idx]) {
 387                                 HPI_DEBUG_LOG(ERROR,
 388                                         "ioremap failed, aborting\n");
 389                                 /* unmap previously mapped pci mem space */
 390                                 goto err;
 391                         }
 392                 }
 393         }
 394
 395         pci.pci_dev = pci_dev;
 396         hm.u.s.resource.bus_type = HPI_BUS_PCI;
 397         hm.u.s.resource.r.pci = &pci;
 398
 399         /* call CreateAdapterObject on the relevant hpi module */
 400         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 401         if (hr.error)
 402                 goto err;
 403
 404         adapter_index = hr.u.s.adapter_index;
 405         adapter.adapter = hpi_find_adapter(adapter_index);
 406
 407         if (prealloc_stream_buf) {
 408                 adapter.p_buffer = vmalloc(prealloc_stream_buf);
 409                 if (!adapter.p_buffer) {
 410                         HPI_DEBUG_LOG(ERROR,
 411                                 "HPI could not allocate "
 412                                 "kernel buffer size %d\n",
 413                                 prealloc_stream_buf);
 414                         goto err;
 415                 }
 416         }
 417
 418         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 419                 HPI_ADAPTER_OPEN);
 420         hm.adapter_index = adapter.adapter->index;
 421         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 422
 423         if (hr.error) {
 424                 HPI_DEBUG_LOG(ERROR, "HPI_ADAPTER_OPEN failed, aborting\n");
 425                 goto err;
 426         }
 427
 428         /* Check if current mode == Low Latency mode */
 429         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 430                 HPI_ADAPTER_GET_MODE);
 431         hm.adapter_index = adapter.adapter->index;
 432         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 433
 434         if (!hr.error
 435                 && hr.u.ax.mode.adapter_mode == HPI_ADAPTER_MODE_LOW_LATENCY)
 436                 low_latency_mode = 1;
 437         else
 438                 dev_info(&pci_dev->dev,
 439                         "Adapter at index %d is not in low latency mode\n",
 440                         adapter.adapter->index);
 441
 442         /* Check if IRQs are supported */
 443         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 444                 HPI_ADAPTER_GET_PROPERTY);
 445         hm.adapter_index = adapter.adapter->index;
 446         hm.u.ax.property_set.property = HPI_ADAPTER_PROPERTY_SUPPORTS_IRQ;
 447         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 448         if (hr.error || !hr.u.ax.property_get.parameter1) {
 449                 dev_info(&pci_dev->dev,
 450                         "IRQs not supported by adapter at index %d\n",
 451                         adapter.adapter->index);
 452         } else {
 453                 irq_supported = 1;
 454         }
 455
 456         /* WARNING can't init mutex in 'adapter'
 457          * and then copy it to adapters[] ?!?!
 458          */
 459         adapters[adapter_index] = adapter;
 460         mutex_init(&adapters[adapter_index].mutex);
 461         pci_set_drvdata(pci_dev, &adapters[adapter_index]);
 462
 463         if (low_latency_mode && irq_supported) {
 464                 if (!adapter.adapter->irq_query_and_clear) {
 465                         dev_err(&pci_dev->dev,
 466                                 "no IRQ handler for adapter %d, aborting\n",
 467                                 adapter.adapter->index);
 468                         goto err;
 469                 }
 470
 471                 /* Disable IRQ generation on DSP side by setting the rate to 0 */
 472                 hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 473                         HPI_ADAPTER_SET_PROPERTY);
 474                 hm.adapter_index = adapter.adapter->index;
 475                 hm.u.ax.property_set.property = HPI_ADAPTER_PROPERTY_IRQ_RATE;
 476                 hm.u.ax.property_set.parameter1 = 0;
 477                 hm.u.ax.property_set.parameter2 = 0;
 478                 hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 479                 if (hr.error) {
 480                         HPI_DEBUG_LOG(ERROR,
 481                                 "HPI_ADAPTER_GET_MODE failed, aborting\n");
 482                         goto err;
 483                 }
 484
 485                 /* Note: request_irq calls asihpi_isr here */
 486                 if (request_irq(pci_dev->irq, asihpi_isr, IRQF_SHARED,
 487                                 "asihpi", &adapters[adapter_index])) {
 488                         dev_err(&pci_dev->dev, "request_irq(%d) failed\n",
 489                                 pci_dev->irq);
 490                         goto err;
 491                 }
 492
 493                 adapters[adapter_index].interrupt_mode = 1;
 494
 495                 dev_info(&pci_dev->dev, "using irq %d\n", pci_dev->irq);
 496                 adapters[adapter_index].irq = pci_dev->irq;
 497         } else {
 498                 dev_info(&pci_dev->dev, "using polled mode\n");
 499         }
 500
 501         dev_info(&pci_dev->dev, "probe succeeded for ASI%04X HPI index %d\n",
 502                  adapter.adapter->type, adapter_index);
 503
 504         return 0;
 505
 506 err:
 507         for (idx = 0; idx < HPI_MAX_ADAPTER_MEM_SPACES; idx++) {
 508                 if (pci.ap_mem_base[idx]) {
 509                         iounmap(pci.ap_mem_base[idx]);
 510                         pci.ap_mem_base[idx] = NULL;
 511                 }
 512         }
 513
 514         if (adapter.p_buffer) {
 515                 adapter.buffer_size = 0;
 516                 vfree(adapter.p_buffer);
 517         }
 518
 519         HPI_DEBUG_LOG(ERROR, "adapter_probe failed\n");
 520         return -ENODEV;
 521 }
 522
 523 void asihpi_adapter_remove(struct pci_dev *pci_dev)
 524 {
 525         int idx;
 526         struct hpi_message hm;
 527         struct hpi_response hr;
 528         struct hpi_adapter *pa;
 529         struct hpi_pci pci;
 530
 531         pa = pci_get_drvdata(pci_dev);
 532         pci = pa->adapter->pci;
 533
 534         /* Disable IRQ generation on DSP side */
 535         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 536                 HPI_ADAPTER_SET_PROPERTY);
 537         hm.adapter_index = pa->adapter->index;
 538         hm.u.ax.property_set.property = HPI_ADAPTER_PROPERTY_IRQ_RATE;
 539         hm.u.ax.property_set.parameter1 = 0;
 540         hm.u.ax.property_set.parameter2 = 0;
 541         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 542
 543         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 544                 HPI_ADAPTER_DELETE);
 545         hm.adapter_index = pa->adapter->index;
 546         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 547
 548         /* unmap PCI memory space, mapped during device init. */
 549         for (idx = 0; idx < HPI_MAX_ADAPTER_MEM_SPACES; ++idx)
 550                 iounmap(pci.ap_mem_base[idx]);
 551
 552         if (pa->irq)
 553                 free_irq(pa->irq, pa);
 554
 555         vfree(pa->p_buffer);
 556
 557         if (1)
 558                 dev_info(&pci_dev->dev,
 559                          "remove %04x:%04x,%04x:%04x,%04x, HPI index %d\n",
 560                          pci_dev->vendor, pci_dev->device,
 561                          pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 562                          pci_dev->devfn, pa->adapter->index);
 563
 564         memset(pa, 0, sizeof(*pa));
 565 }
 566
 567 void __init asihpi_init(void)
 568 {
 569         struct hpi_message hm;
 570         struct hpi_response hr;
 571
 572         memset(adapters, 0, sizeof(adapters));
 573
 574         printk(KERN_INFO "ASIHPI driver " HPI_VER_STRING "\n");
 575
 576         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
 577                 HPI_SUBSYS_DRIVER_LOAD);
 578         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 579 }
 580
 581 void asihpi_exit(void)
 582 {
 583         struct hpi_message hm;
 584         struct hpi_response hr;
 585
 586         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
 587                 HPI_SUBSYS_DRIVER_UNLOAD);
 588         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 589 }