kernel/2.6.29.6-aldebaran-rt/drivers/media/radio/radio-mr800.c

   1 /*
   2  * A driver for the AverMedia MR 800 USB FM radio. This device plugs
   3  * into both the USB and an analog audio input, so this thing
   4  * only deals with initialization and frequency setting, the
   5  * audio data has to be handled by a sound driver.
   6  *
   7  * Copyright (c) 2008 Alexey Klimov <klimov.linux@gmail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * Big thanks to authors of dsbr100.c and radio-si470x.c
  26  *
  27  * When work was looked pretty good, i discover this:
  28  * http://av-usbradio.sourceforge.net/index.php
  29  * http://sourceforge.net/projects/av-usbradio/
  30  * Latest release of theirs project was in 2005.
  31  * Probably, this driver could be improved trough using their
  32  * achievements (specifications given).
  33  * So, we have smth to begin with.
  34  *
  35  * History:
  36  * Version 0.01:        First working version.
  37  *                      It's required to blacklist AverMedia USB Radio
  38  *                      in usbhid/hid-quirks.c
  39  *
  40  * Many things to do:
  41  *      - Correct power managment of device (suspend & resume)
  42  *      - Make x86 independance (little-endian and big-endian stuff)
  43  *      - Add code for scanning and smooth tuning
  44  *      - Checked and add stereo&mono stuff
  45  *      - Add code for sensitivity value
  46  *      - Correct mistakes
  47  *      - In Japan another FREQ_MIN and FREQ_MAX
  48  */
  49
  50 /* kernel includes */
  51 #include <linux/kernel.h>
  52 #include <linux/module.h>
  53 #include <linux/init.h>
  54 #include <linux/slab.h>
  55 #include <linux/input.h>
  56 #include <linux/videodev2.h>
  57 #include <media/v4l2-common.h>
  58 #include <media/v4l2-ioctl.h>
  59 #include <linux/usb.h>
  60 #include <linux/version.h>      /* for KERNEL_VERSION MACRO */
  61
  62 /* driver and module definitions */
  63 #define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>"
  64 #define DRIVER_DESC "AverMedia MR 800 USB FM radio driver"
  65 #define DRIVER_VERSION "0.01"
  66 #define RADIO_VERSION KERNEL_VERSION(0, 0, 1)
  67
  68 MODULE_AUTHOR(DRIVER_AUTHOR);
  69 MODULE_DESCRIPTION(DRIVER_DESC);
  70 MODULE_LICENSE("GPL");
  71
  72 #define USB_AMRADIO_VENDOR 0x07ca
  73 #define USB_AMRADIO_PRODUCT 0xb800
  74
  75 /* dev_warn macro with driver name */
  76 #define MR800_DRIVER_NAME "radio-mr800"
  77 #define amradio_dev_warn(dev, fmt, arg...)                              \
  78                 dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
  79
  80 /* Probably USB_TIMEOUT should be modified in module parameter */
  81 #define BUFFER_LENGTH 8
  82 #define USB_TIMEOUT 500
  83
  84 /* Frequency limits in MHz -- these are European values.  For Japanese
  85 devices, that would be 76 and 91.  */
  86 #define FREQ_MIN  87.5
  87 #define FREQ_MAX 108.0
  88 #define FREQ_MUL 16000
  89
  90 /* module parameter */
  91 static int radio_nr = -1;
  92 module_param(radio_nr, int, 0);
  93 MODULE_PARM_DESC(radio_nr, "Radio Nr");
  94
  95 static struct v4l2_queryctrl radio_qctrl[] = {
  96         {
  97                 .id            = V4L2_CID_AUDIO_MUTE,
  98                 .name          = "Mute",
  99                 .minimum       = 0,
 100                 .maximum       = 1,
 101                 .step          = 1,
 102                 .default_value = 1,
 103                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 104         },
 105 /* HINT: the disabled controls are only here to satify kradio and such apps */
 106         {       .id             = V4L2_CID_AUDIO_VOLUME,
 107                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 108         },
 109         {
 110                 .id             = V4L2_CID_AUDIO_BALANCE,
 111                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 112         },
 113         {
 114                 .id             = V4L2_CID_AUDIO_BASS,
 115                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 116         },
 117         {
 118                 .id             = V4L2_CID_AUDIO_TREBLE,
 119                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 120         },
 121         {
 122                 .id             = V4L2_CID_AUDIO_LOUDNESS,
 123                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 124         },
 125 };
 126
 127 static int usb_amradio_probe(struct usb_interface *intf,
 128                              const struct usb_device_id *id);
 129 static void usb_amradio_disconnect(struct usb_interface *intf);
 130 static int usb_amradio_open(struct file *file);
 131 static int usb_amradio_close(struct file *file);
 132 static int usb_amradio_suspend(struct usb_interface *intf,
 133                                 pm_message_t message);
 134 static int usb_amradio_resume(struct usb_interface *intf);
 135
 136 /* Data for one (physical) device */
 137 struct amradio_device {
 138         /* reference to USB and video device */
 139         struct usb_device *usbdev;
 140         struct video_device *videodev;
 141
 142         unsigned char *buffer;
 143         struct mutex lock;      /* buffer locking */
 144         int curfreq;
 145         int stereo;
 146         int users;
 147         int removed;
 148         int muted;
 149 };
 150
 151 /* USB Device ID List */
 152 static struct usb_device_id usb_amradio_device_table[] = {
 153         {USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
 154                                                         USB_CLASS_HID, 0, 0) },
 155         { }                                             /* Terminating entry */
 156 };
 157
 158 MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);
 159
 160 /* USB subsystem interface */
 161 static struct usb_driver usb_amradio_driver = {
 162         .name                   = MR800_DRIVER_NAME,
 163         .probe                  = usb_amradio_probe,
 164         .disconnect             = usb_amradio_disconnect,
 165         .suspend                = usb_amradio_suspend,
 166         .resume                 = usb_amradio_resume,
 167         .reset_resume           = usb_amradio_resume,
 168         .id_table               = usb_amradio_device_table,
 169         .supports_autosuspend   = 0,
 170 };
 171
 172 /* switch on radio. Send 8 bytes to device. */
 173 static int amradio_start(struct amradio_device *radio)
 174 {
 175         int retval;
 176         int size;
 177
 178         mutex_lock(&radio->lock);
 179
 180         radio->buffer[0] = 0x00;
 181         radio->buffer[1] = 0x55;
 182         radio->buffer[2] = 0xaa;
 183         radio->buffer[3] = 0x00;
 184         radio->buffer[4] = 0xab;
 185         radio->buffer[5] = 0x00;
 186         radio->buffer[6] = 0x00;
 187         radio->buffer[7] = 0x00;
 188
 189         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 190                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 191
 192         if (retval) {
 193                 mutex_unlock(&radio->lock);
 194                 return retval;
 195         }
 196
 197         radio->muted = 0;
 198
 199         mutex_unlock(&radio->lock);
 200
 201         return retval;
 202 }
 203
 204 /* switch off radio */
 205 static int amradio_stop(struct amradio_device *radio)
 206 {
 207         int retval;
 208         int size;
 209
 210         /* safety check */
 211         if (radio->removed)
 212                 return -EIO;
 213
 214         mutex_lock(&radio->lock);
 215
 216         radio->buffer[0] = 0x00;
 217         radio->buffer[1] = 0x55;
 218         radio->buffer[2] = 0xaa;
 219         radio->buffer[3] = 0x00;
 220         radio->buffer[4] = 0xab;
 221         radio->buffer[5] = 0x01;
 222         radio->buffer[6] = 0x00;
 223         radio->buffer[7] = 0x00;
 224
 225         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 226                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 227
 228         if (retval) {
 229                 mutex_unlock(&radio->lock);
 230                 return retval;
 231         }
 232
 233         radio->muted = 1;
 234
 235         mutex_unlock(&radio->lock);
 236
 237         return retval;
 238 }
 239
 240 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 241 static int amradio_setfreq(struct amradio_device *radio, int freq)
 242 {
 243         int retval;
 244         int size;
 245         unsigned short freq_send = 0x13 + (freq >> 3) / 25;
 246
 247         /* safety check */
 248         if (radio->removed)
 249                 return -EIO;
 250
 251         mutex_lock(&radio->lock);
 252
 253         radio->buffer[0] = 0x00;
 254         radio->buffer[1] = 0x55;
 255         radio->buffer[2] = 0xaa;
 256         radio->buffer[3] = 0x03;
 257         radio->buffer[4] = 0xa4;
 258         radio->buffer[5] = 0x00;
 259         radio->buffer[6] = 0x00;
 260         radio->buffer[7] = 0x08;
 261
 262         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 263                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 264
 265         if (retval) {
 266                 mutex_unlock(&radio->lock);
 267                 return retval;
 268         }
 269
 270         /* frequency is calculated from freq_send and placed in first 2 bytes */
 271         radio->buffer[0] = (freq_send >> 8) & 0xff;
 272         radio->buffer[1] = freq_send & 0xff;
 273         radio->buffer[2] = 0x01;
 274         radio->buffer[3] = 0x00;
 275         radio->buffer[4] = 0x00;
 276         /* 5 and 6 bytes of buffer already = 0x00 */
 277         radio->buffer[7] = 0x00;
 278
 279         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 280                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 281
 282         if (retval) {
 283                 mutex_unlock(&radio->lock);
 284                 return retval;
 285         }
 286
 287         radio->stereo = 0;
 288
 289         mutex_unlock(&radio->lock);
 290
 291         return retval;
 292 }
 293
 294 /* USB subsystem interface begins here */
 295
 296 /* handle unplugging of the device, release data structures
 297 if nothing keeps us from doing it.  If something is still
 298 keeping us busy, the release callback of v4l will take care
 299 of releasing it. */
 300 static void usb_amradio_disconnect(struct usb_interface *intf)
 301 {
 302         struct amradio_device *radio = usb_get_intfdata(intf);
 303
 304         mutex_lock(&radio->lock);
 305         radio->removed = 1;
 306         mutex_unlock(&radio->lock);
 307
 308         usb_set_intfdata(intf, NULL);
 309         video_unregister_device(radio->videodev);
 310 }
 311
 312 /* vidioc_querycap - query device capabilities */
 313 static int vidioc_querycap(struct file *file, void *priv,
 314                                         struct v4l2_capability *v)
 315 {
 316         strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
 317         strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
 318         sprintf(v->bus_info, "USB");
 319         v->version = RADIO_VERSION;
 320         v->capabilities = V4L2_CAP_TUNER;
 321         return 0;
 322 }
 323
 324 /* vidioc_g_tuner - get tuner attributes */
 325 static int vidioc_g_tuner(struct file *file, void *priv,
 326                                 struct v4l2_tuner *v)
 327 {
 328         struct amradio_device *radio = video_get_drvdata(video_devdata(file));
 329
 330         /* safety check */
 331         if (radio->removed)
 332                 return -EIO;
 333
 334         if (v->index > 0)
 335                 return -EINVAL;
 336
 337 /* TODO: Add function which look is signal stereo or not
 338  *      amradio_getstat(radio);
 339  */
 340         radio->stereo = -1;
 341         strcpy(v->name, "FM");
 342         v->type = V4L2_TUNER_RADIO;
 343         v->rangelow = FREQ_MIN * FREQ_MUL;
 344         v->rangehigh = FREQ_MAX * FREQ_MUL;
 345         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 346         v->capability = V4L2_TUNER_CAP_LOW;
 347         if (radio->stereo)
 348                 v->audmode = V4L2_TUNER_MODE_STEREO;
 349         else
 350                 v->audmode = V4L2_TUNER_MODE_MONO;
 351         v->signal = 0xffff;     /* Can't get the signal strength, sad.. */
 352         v->afc = 0; /* Don't know what is this */
 353         return 0;
 354 }
 355
 356 /* vidioc_s_tuner - set tuner attributes */
 357 static int vidioc_s_tuner(struct file *file, void *priv,
 358                                 struct v4l2_tuner *v)
 359 {
 360         struct amradio_device *radio = video_get_drvdata(video_devdata(file));
 361
 362         /* safety check */
 363         if (radio->removed)
 364                 return -EIO;
 365
 366         if (v->index > 0)
 367                 return -EINVAL;
 368         return 0;
 369 }
 370
 371 /* vidioc_s_frequency - set tuner radio frequency */
 372 static int vidioc_s_frequency(struct file *file, void *priv,
 373                                 struct v4l2_frequency *f)
 374 {
 375         struct amradio_device *radio = video_get_drvdata(video_devdata(file));
 376
 377         /* safety check */
 378         if (radio->removed)
 379                 return -EIO;
 380
 381         radio->curfreq = f->frequency;
 382         if (amradio_setfreq(radio, radio->curfreq) < 0)
 383                 amradio_dev_warn(&radio->videodev->dev,
 384                         "set frequency failed\n");
 385         return 0;
 386 }
 387
 388 /* vidioc_g_frequency - get tuner radio frequency */
 389 static int vidioc_g_frequency(struct file *file, void *priv,
 390                                 struct v4l2_frequency *f)
 391 {
 392         struct amradio_device *radio = video_get_drvdata(video_devdata(file));
 393
 394         /* safety check */
 395         if (radio->removed)
 396                 return -EIO;
 397
 398         f->type = V4L2_TUNER_RADIO;
 399         f->frequency = radio->curfreq;
 400         return 0;
 401 }
 402
 403 /* vidioc_queryctrl - enumerate control items */
 404 static int vidioc_queryctrl(struct file *file, void *priv,
 405                                 struct v4l2_queryctrl *qc)
 406 {
 407         int i;
 408
 409         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 410                 if (qc->id && qc->id == radio_qctrl[i].id) {
 411                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 412                         return 0;
 413                 }
 414         }
 415         return -EINVAL;
 416 }
 417
 418 /* vidioc_g_ctrl - get the value of a control */
 419 static int vidioc_g_ctrl(struct file *file, void *priv,
 420                                 struct v4l2_control *ctrl)
 421 {
 422         struct amradio_device *radio = video_get_drvdata(video_devdata(file));
 423
 424         /* safety check */
 425         if (radio->removed)
 426                 return -EIO;
 427
 428         switch (ctrl->id) {
 429         case V4L2_CID_AUDIO_MUTE:
 430                 ctrl->value = radio->muted;
 431                 return 0;
 432         }
 433         return -EINVAL;
 434 }
 435
 436 /* vidioc_s_ctrl - set the value of a control */
 437 static int vidioc_s_ctrl(struct file *file, void *priv,
 438                                 struct v4l2_control *ctrl)
 439 {
 440         struct amradio_device *radio = video_get_drvdata(video_devdata(file));
 441
 442         /* safety check */
 443         if (radio->removed)
 444                 return -EIO;
 445
 446         switch (ctrl->id) {
 447         case V4L2_CID_AUDIO_MUTE:
 448                 if (ctrl->value) {
 449                         if (amradio_stop(radio) < 0) {
 450                                 amradio_dev_warn(&radio->videodev->dev,
 451                                         "amradio_stop failed\n");
 452                                 return -1;
 453                         }
 454                 } else {
 455                         if (amradio_start(radio) < 0) {
 456                                 amradio_dev_warn(&radio->videodev->dev,
 457                                         "amradio_start failed\n");
 458                                 return -1;
 459                         }
 460                 }
 461                 return 0;
 462         }
 463         return -EINVAL;
 464 }
 465
 466 /* vidioc_g_audio - get audio attributes */
 467 static int vidioc_g_audio(struct file *file, void *priv,
 468                                 struct v4l2_audio *a)
 469 {
 470         if (a->index > 1)
 471                 return -EINVAL;
 472
 473         strcpy(a->name, "Radio");
 474         a->capability = V4L2_AUDCAP_STEREO;
 475         return 0;
 476 }
 477
 478 /* vidioc_s_audio - set audio attributes  */
 479 static int vidioc_s_audio(struct file *file, void *priv,
 480                                         struct v4l2_audio *a)
 481 {
 482         if (a->index != 0)
 483                 return -EINVAL;
 484         return 0;
 485 }
 486
 487 /* vidioc_g_input - get input */
 488 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 489 {
 490         *i = 0;
 491         return 0;
 492 }
 493
 494 /* vidioc_s_input - set input */
 495 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 496 {
 497         if (i != 0)
 498                 return -EINVAL;
 499         return 0;
 500 }
 501
 502 /* open device - amradio_start() and amradio_setfreq() */
 503 static int usb_amradio_open(struct file *file)
 504 {
 505         struct amradio_device *radio = video_get_drvdata(video_devdata(file));
 506
 507         lock_kernel();
 508
 509         radio->users = 1;
 510         radio->muted = 1;
 511
 512         if (amradio_start(radio) < 0) {
 513                 amradio_dev_warn(&radio->videodev->dev,
 514                         "radio did not start up properly\n");
 515                 radio->users = 0;
 516                 unlock_kernel();
 517                 return -EIO;
 518         }
 519         if (amradio_setfreq(radio, radio->curfreq) < 0)
 520                 amradio_dev_warn(&radio->videodev->dev,
 521                         "set frequency failed\n");
 522
 523         unlock_kernel();
 524         return 0;
 525 }
 526
 527 /*close device */
 528 static int usb_amradio_close(struct file *file)
 529 {
 530         struct amradio_device *radio = video_get_drvdata(video_devdata(file));
 531         int retval;
 532
 533         if (!radio)
 534                 return -ENODEV;
 535
 536         radio->users = 0;
 537
 538         if (!radio->removed) {
 539                 retval = amradio_stop(radio);
 540                 if (retval < 0)
 541                         amradio_dev_warn(&radio->videodev->dev,
 542                                 "amradio_stop failed\n");
 543         }
 544
 545         return 0;
 546 }
 547
 548 /* Suspend device - stop device. Need to be checked and fixed */
 549 static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
 550 {
 551         struct amradio_device *radio = usb_get_intfdata(intf);
 552
 553         if (amradio_stop(radio) < 0)
 554                 dev_warn(&intf->dev, "amradio_stop failed\n");
 555
 556         dev_info(&intf->dev, "going into suspend..\n");
 557
 558         return 0;
 559 }
 560
 561 /* Resume device - start device. Need to be checked and fixed */
 562 static int usb_amradio_resume(struct usb_interface *intf)
 563 {
 564         struct amradio_device *radio = usb_get_intfdata(intf);
 565
 566         if (amradio_start(radio) < 0)
 567                 dev_warn(&intf->dev, "amradio_start failed\n");
 568
 569         dev_info(&intf->dev, "coming out of suspend..\n");
 570
 571         return 0;
 572 }
 573
 574 /* File system interface */
 575 static const struct v4l2_file_operations usb_amradio_fops = {
 576         .owner          = THIS_MODULE,
 577         .open           = usb_amradio_open,
 578         .release        = usb_amradio_close,
 579         .ioctl          = video_ioctl2,
 580 };
 581
 582 static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = {
 583         .vidioc_querycap    = vidioc_querycap,
 584         .vidioc_g_tuner     = vidioc_g_tuner,
 585         .vidioc_s_tuner     = vidioc_s_tuner,
 586         .vidioc_g_frequency = vidioc_g_frequency,
 587         .vidioc_s_frequency = vidioc_s_frequency,
 588         .vidioc_queryctrl   = vidioc_queryctrl,
 589         .vidioc_g_ctrl      = vidioc_g_ctrl,
 590         .vidioc_s_ctrl      = vidioc_s_ctrl,
 591         .vidioc_g_audio     = vidioc_g_audio,
 592         .vidioc_s_audio     = vidioc_s_audio,
 593         .vidioc_g_input     = vidioc_g_input,
 594         .vidioc_s_input     = vidioc_s_input,
 595 };
 596
 597 static void usb_amradio_device_release(struct video_device *videodev)
 598 {
 599         struct amradio_device *radio = video_get_drvdata(videodev);
 600
 601         /* we call v4l to free radio->videodev */
 602         video_device_release(videodev);
 603
 604         /* free rest memory */
 605         kfree(radio->buffer);
 606         kfree(radio);
 607 }
 608
 609 /* V4L2 interface */
 610 static struct video_device amradio_videodev_template = {
 611         .name           = "AverMedia MR 800 USB FM Radio",
 612         .fops           = &usb_amradio_fops,
 613         .ioctl_ops      = &usb_amradio_ioctl_ops,
 614         .release        = usb_amradio_device_release,
 615 };
 616
 617 /* check if the device is present and register with v4l and
 618 usb if it is */
 619 static int usb_amradio_probe(struct usb_interface *intf,
 620                                 const struct usb_device_id *id)
 621 {
 622         struct amradio_device *radio;
 623
 624         radio = kmalloc(sizeof(struct amradio_device), GFP_KERNEL);
 625
 626         if (!(radio))
 627                 return -ENOMEM;
 628
 629         radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
 630
 631         if (!(radio->buffer)) {
 632                 kfree(radio);
 633                 return -ENOMEM;
 634         }
 635
 636         radio->videodev = video_device_alloc();
 637
 638         if (!(radio->videodev)) {
 639                 kfree(radio->buffer);
 640                 kfree(radio);
 641                 return -ENOMEM;
 642         }
 643
 644         memcpy(radio->videodev, &amradio_videodev_template,
 645                 sizeof(amradio_videodev_template));
 646
 647         radio->removed = 0;
 648         radio->users = 0;
 649         radio->usbdev = interface_to_usbdev(intf);
 650         radio->curfreq = 95.16 * FREQ_MUL;
 651
 652         mutex_init(&radio->lock);
 653
 654         video_set_drvdata(radio->videodev, radio);
 655         if (video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr)) {
 656                 dev_warn(&intf->dev, "could not register video device\n");
 657                 video_device_release(radio->videodev);
 658                 kfree(radio->buffer);
 659                 kfree(radio);
 660                 return -EIO;
 661         }
 662
 663         usb_set_intfdata(intf, radio);
 664         return 0;
 665 }
 666
 667 static int __init amradio_init(void)
 668 {
 669         int retval = usb_register(&usb_amradio_driver);
 670
 671         pr_info(KBUILD_MODNAME
 672                 ": version " DRIVER_VERSION " " DRIVER_DESC "\n");
 673
 674         if (retval)
 675                 pr_err(KBUILD_MODNAME
 676                         ": usb_register failed. Error number %d\n", retval);
 677
 678         return retval;
 679 }
 680
 681 static void __exit amradio_exit(void)
 682 {
 683         usb_deregister(&usb_amradio_driver);
 684 }
 685
 686 module_init(amradio_init);
 687 module_exit(amradio_exit);
 688