drivers/media/radio/dsbr100.c

   1 /* A driver for the D-Link DSB-R100 USB radio and Gemtek USB Radio 21.
   2  The device plugs into both the USB and an analog audio input, so this thing
   3  only deals with initialisation and frequency setting, the
   4  audio data has to be handled by a sound driver.
   5
   6  Major issue: I can't find out where the device reports the signal
   7  strength, and indeed the windows software appearantly just looks
   8  at the stereo indicator as well.  So, scanning will only find
   9  stereo stations.  Sad, but I can't help it.
  10
  11  Also, the windows program sends oodles of messages over to the
  12  device, and I couldn't figure out their meaning.  My suspicion
  13  is that they don't have any:-)
  14
  15  You might find some interesting stuff about this module at
  16  http://unimut.fsk.uni-heidelberg.de/unimut/demi/dsbr
  17
  18  Copyright (c) 2000 Markus Demleitner <msdemlei@cl.uni-heidelberg.de>
  19
  20  This program is free software; you can redistribute it and/or modify
  21  it under the terms of the GNU General Public License as published by
  22  the Free Software Foundation; either version 2 of the License, or
  23  (at your option) any later version.
  24
  25  This program is distributed in the hope that it will be useful,
  26  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  GNU General Public License for more details.
  29
  30  You should have received a copy of the GNU General Public License
  31  along with this program; if not, write to the Free Software
  32  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  33
  34  History:
  35
  36  Version 0.46:
  37         Removed usb_dsbr100_open/close calls and radio->users counter. Also,
  38         radio->muted changed to radio->status and suspend/resume calls updated.
  39
  40  Version 0.45:
  41         Converted to v4l2_device.
  42
  43  Version 0.44:
  44         Add suspend/resume functions, fix unplug of device,
  45         a lot of cleanups and fixes by Alexey Klimov <klimov.linux@gmail.com>
  46
  47  Version 0.43:
  48         Oliver Neukum: avoided DMA coherency issue
  49
  50  Version 0.42:
  51         Converted dsbr100 to use video_ioctl2
  52         by Douglas Landgraf <dougsland@gmail.com>
  53
  54  Version 0.41-ac1:
  55         Alan Cox: Some cleanups and fixes
  56
  57  Version 0.41:
  58         Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  59
  60  Version 0.40:
  61         Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing
  62
  63  Version 0.30:
  64         Markus: Updates for 2.5.x kernel and more ISO compliant source
  65
  66  Version 0.25:
  67         PSL and Markus: Cleanup, radio now doesn't stop on device close
  68
  69  Version 0.24:
  70         Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
  71         right.  Some minor cleanup, improved standalone compilation
  72
  73  Version 0.23:
  74         Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
  75
  76  Version 0.22:
  77         Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
  78         thanks to Mike Cox for pointing the problem out.
  79
  80  Version 0.21:
  81         Markus: Minor cleanup, warnings if something goes wrong, lame attempt
  82         to adhere to Documentation/CodingStyle
  83
  84  Version 0.2:
  85         Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
  86         Markus: Copyright clarification
  87
  88  Version 0.01: Markus: initial release
  89
  90 */
  91
  92 #include <linux/kernel.h>
  93 #include <linux/module.h>
  94 #include <linux/init.h>
  95 #include <linux/slab.h>
  96 #include <linux/input.h>
  97 #include <linux/videodev2.h>
  98 #include <media/v4l2-device.h>
  99 #include <media/v4l2-ioctl.h>
 100 #include <linux/usb.h>
 101
 102 /*
 103  * Version Information
 104  */
 105 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
 106
 107 #define DRIVER_VERSION "v0.46"
 108 #define RADIO_VERSION KERNEL_VERSION(0, 4, 6)
 109
 110 #define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
 111 #define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"
 112
 113 #define DSB100_VENDOR 0x04b4
 114 #define DSB100_PRODUCT 0x1002
 115
 116 /* Commands the device appears to understand */
 117 #define DSB100_TUNE 1
 118 #define DSB100_ONOFF 2
 119
 120 #define TB_LEN 16
 121
 122 /* Frequency limits in MHz -- these are European values.  For Japanese
 123 devices, that would be 76 and 91.  */
 124 #define FREQ_MIN  87.5
 125 #define FREQ_MAX 108.0
 126 #define FREQ_MUL 16000
 127
 128 /* defines for radio->status */
 129 #define STARTED 0
 130 #define STOPPED 1
 131
 132 #define videodev_to_radio(d) container_of(d, struct dsbr100_device, videodev)
 133
 134 static int usb_dsbr100_probe(struct usb_interface *intf,
 135                              const struct usb_device_id *id);
 136 static void usb_dsbr100_disconnect(struct usb_interface *intf);
 137 static int usb_dsbr100_suspend(struct usb_interface *intf,
 138                                                 pm_message_t message);
 139 static int usb_dsbr100_resume(struct usb_interface *intf);
 140
 141 static int radio_nr = -1;
 142 module_param(radio_nr, int, 0);
 143
 144 /* Data for one (physical) device */
 145 struct dsbr100_device {
 146         struct usb_device *usbdev;
 147         struct video_device videodev;
 148         struct v4l2_device v4l2_dev;
 149
 150         u8 *transfer_buffer;
 151         struct mutex v4l2_lock;
 152         int curfreq;
 153         int stereo;
 154         int removed;
 155         int status;
 156 };
 157
 158 static struct usb_device_id usb_dsbr100_device_table [] = {
 159         { USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
 160         { }                                             /* Terminating entry */
 161 };
 162
 163 MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);
 164
 165 /* USB subsystem interface */
 166 static struct usb_driver usb_dsbr100_driver = {
 167         .name                   = "dsbr100",
 168         .probe                  = usb_dsbr100_probe,
 169         .disconnect             = usb_dsbr100_disconnect,
 170         .id_table               = usb_dsbr100_device_table,
 171         .suspend                = usb_dsbr100_suspend,
 172         .resume                 = usb_dsbr100_resume,
 173         .reset_resume           = usb_dsbr100_resume,
 174         .supports_autosuspend   = 0,
 175 };
 176
 177 /* Low-level device interface begins here */
 178
 179 /* switch on radio */
 180 static int dsbr100_start(struct dsbr100_device *radio)
 181 {
 182         int retval;
 183         int request;
 184
 185         retval = usb_control_msg(radio->usbdev,
 186                 usb_rcvctrlpipe(radio->usbdev, 0),
 187                 USB_REQ_GET_STATUS,
 188                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 189                 0x00, 0xC7, radio->transfer_buffer, 8, 300);
 190
 191         if (retval < 0) {
 192                 request = USB_REQ_GET_STATUS;
 193                 goto usb_control_msg_failed;
 194         }
 195
 196         retval = usb_control_msg(radio->usbdev,
 197                 usb_rcvctrlpipe(radio->usbdev, 0),
 198                 DSB100_ONOFF,
 199                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 200                 0x01, 0x00, radio->transfer_buffer, 8, 300);
 201
 202         if (retval < 0) {
 203                 request = DSB100_ONOFF;
 204                 goto usb_control_msg_failed;
 205         }
 206
 207         radio->status = STARTED;
 208         return (radio->transfer_buffer)[0];
 209
 210 usb_control_msg_failed:
 211         dev_err(&radio->usbdev->dev,
 212                 "%s - usb_control_msg returned %i, request %i\n",
 213                         __func__, retval, request);
 214         return retval;
 215
 216 }
 217
 218 /* switch off radio */
 219 static int dsbr100_stop(struct dsbr100_device *radio)
 220 {
 221         int retval;
 222         int request;
 223
 224         retval = usb_control_msg(radio->usbdev,
 225                 usb_rcvctrlpipe(radio->usbdev, 0),
 226                 USB_REQ_GET_STATUS,
 227                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 228                 0x16, 0x1C, radio->transfer_buffer, 8, 300);
 229
 230         if (retval < 0) {
 231                 request = USB_REQ_GET_STATUS;
 232                 goto usb_control_msg_failed;
 233         }
 234
 235         retval = usb_control_msg(radio->usbdev,
 236                 usb_rcvctrlpipe(radio->usbdev, 0),
 237                 DSB100_ONOFF,
 238                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 239                 0x00, 0x00, radio->transfer_buffer, 8, 300);
 240
 241         if (retval < 0) {
 242                 request = DSB100_ONOFF;
 243                 goto usb_control_msg_failed;
 244         }
 245
 246         radio->status = STOPPED;
 247         return (radio->transfer_buffer)[0];
 248
 249 usb_control_msg_failed:
 250         dev_err(&radio->usbdev->dev,
 251                 "%s - usb_control_msg returned %i, request %i\n",
 252                         __func__, retval, request);
 253         return retval;
 254
 255 }
 256
 257 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 258 static int dsbr100_setfreq(struct dsbr100_device *radio)
 259 {
 260         int retval;
 261         int request;
 262         int freq = (radio->curfreq / 16 * 80) / 1000 + 856;
 263
 264         retval = usb_control_msg(radio->usbdev,
 265                 usb_rcvctrlpipe(radio->usbdev, 0),
 266                 DSB100_TUNE,
 267                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 268                 (freq >> 8) & 0x00ff, freq & 0xff,
 269                 radio->transfer_buffer, 8, 300);
 270
 271         if (retval < 0) {
 272                 request = DSB100_TUNE;
 273                 goto usb_control_msg_failed;
 274         }
 275
 276         retval = usb_control_msg(radio->usbdev,
 277                 usb_rcvctrlpipe(radio->usbdev, 0),
 278                 USB_REQ_GET_STATUS,
 279                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 280                 0x96, 0xB7, radio->transfer_buffer, 8, 300);
 281
 282         if (retval < 0) {
 283                 request = USB_REQ_GET_STATUS;
 284                 goto usb_control_msg_failed;
 285         }
 286
 287         retval = usb_control_msg(radio->usbdev,
 288                 usb_rcvctrlpipe(radio->usbdev, 0),
 289                 USB_REQ_GET_STATUS,
 290                 USB_TYPE_VENDOR | USB_RECIP_DEVICE |  USB_DIR_IN,
 291                 0x00, 0x24, radio->transfer_buffer, 8, 300);
 292
 293         if (retval < 0) {
 294                 request = USB_REQ_GET_STATUS;
 295                 goto usb_control_msg_failed;
 296         }
 297
 298         radio->stereo = !((radio->transfer_buffer)[0] & 0x01);
 299         return (radio->transfer_buffer)[0];
 300
 301 usb_control_msg_failed:
 302         radio->stereo = -1;
 303         dev_err(&radio->usbdev->dev,
 304                 "%s - usb_control_msg returned %i, request %i\n",
 305                         __func__, retval, request);
 306         return retval;
 307 }
 308
 309 /* return the device status.  This is, in effect, just whether it
 310 sees a stereo signal or not.  Pity. */
 311 static void dsbr100_getstat(struct dsbr100_device *radio)
 312 {
 313         int retval;
 314
 315         retval = usb_control_msg(radio->usbdev,
 316                 usb_rcvctrlpipe(radio->usbdev, 0),
 317                 USB_REQ_GET_STATUS,
 318                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 319                 0x00 , 0x24, radio->transfer_buffer, 8, 300);
 320
 321         if (retval < 0) {
 322                 radio->stereo = -1;
 323                 dev_err(&radio->usbdev->dev,
 324                         "%s - usb_control_msg returned %i, request %i\n",
 325                                 __func__, retval, USB_REQ_GET_STATUS);
 326         } else {
 327                 radio->stereo = !(radio->transfer_buffer[0] & 0x01);
 328         }
 329 }
 330
 331 static int vidioc_querycap(struct file *file, void *priv,
 332                                         struct v4l2_capability *v)
 333 {
 334         struct dsbr100_device *radio = video_drvdata(file);
 335
 336         strlcpy(v->driver, "dsbr100", sizeof(v->driver));
 337         strlcpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
 338         usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
 339         v->version = RADIO_VERSION;
 340         v->capabilities = V4L2_CAP_TUNER;
 341         return 0;
 342 }
 343
 344 static int vidioc_g_tuner(struct file *file, void *priv,
 345                                 struct v4l2_tuner *v)
 346 {
 347         struct dsbr100_device *radio = video_drvdata(file);
 348
 349         /* safety check */
 350         if (radio->removed)
 351                 return -EIO;
 352
 353         if (v->index > 0)
 354                 return -EINVAL;
 355
 356         dsbr100_getstat(radio);
 357         strcpy(v->name, "FM");
 358         v->type = V4L2_TUNER_RADIO;
 359         v->rangelow = FREQ_MIN * FREQ_MUL;
 360         v->rangehigh = FREQ_MAX * FREQ_MUL;
 361         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 362         v->capability = V4L2_TUNER_CAP_LOW;
 363         if(radio->stereo)
 364                 v->audmode = V4L2_TUNER_MODE_STEREO;
 365         else
 366                 v->audmode = V4L2_TUNER_MODE_MONO;
 367         v->signal = 0xffff;     /* We can't get the signal strength */
 368         return 0;
 369 }
 370
 371 static int vidioc_s_tuner(struct file *file, void *priv,
 372                                 struct v4l2_tuner *v)
 373 {
 374         struct dsbr100_device *radio = video_drvdata(file);
 375
 376         /* safety check */
 377         if (radio->removed)
 378                 return -EIO;
 379
 380         if (v->index > 0)
 381                 return -EINVAL;
 382
 383         return 0;
 384 }
 385
 386 static int vidioc_s_frequency(struct file *file, void *priv,
 387                                 struct v4l2_frequency *f)
 388 {
 389         struct dsbr100_device *radio = video_drvdata(file);
 390         int retval;
 391
 392         /* safety check */
 393         if (radio->removed)
 394                 return -EIO;
 395
 396         radio->curfreq = f->frequency;
 397
 398         retval = dsbr100_setfreq(radio);
 399         if (retval < 0)
 400                 dev_warn(&radio->usbdev->dev, "Set frequency failed\n");
 401         return 0;
 402 }
 403
 404 static int vidioc_g_frequency(struct file *file, void *priv,
 405                                 struct v4l2_frequency *f)
 406 {
 407         struct dsbr100_device *radio = video_drvdata(file);
 408
 409         /* safety check */
 410         if (radio->removed)
 411                 return -EIO;
 412
 413         f->type = V4L2_TUNER_RADIO;
 414         f->frequency = radio->curfreq;
 415         return 0;
 416 }
 417
 418 static int vidioc_queryctrl(struct file *file, void *priv,
 419                                 struct v4l2_queryctrl *qc)
 420 {
 421         switch (qc->id) {
 422         case V4L2_CID_AUDIO_MUTE:
 423                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 424         }
 425
 426         return -EINVAL;
 427 }
 428
 429 static int vidioc_g_ctrl(struct file *file, void *priv,
 430                                 struct v4l2_control *ctrl)
 431 {
 432         struct dsbr100_device *radio = video_drvdata(file);
 433
 434         /* safety check */
 435         if (radio->removed)
 436                 return -EIO;
 437
 438         switch (ctrl->id) {
 439         case V4L2_CID_AUDIO_MUTE:
 440                 ctrl->value = radio->status;
 441                 return 0;
 442         }
 443         return -EINVAL;
 444 }
 445
 446 static int vidioc_s_ctrl(struct file *file, void *priv,
 447                                 struct v4l2_control *ctrl)
 448 {
 449         struct dsbr100_device *radio = video_drvdata(file);
 450         int retval;
 451
 452         /* safety check */
 453         if (radio->removed)
 454                 return -EIO;
 455
 456         switch (ctrl->id) {
 457         case V4L2_CID_AUDIO_MUTE:
 458                 if (ctrl->value) {
 459                         retval = dsbr100_stop(radio);
 460                         if (retval < 0) {
 461                                 dev_warn(&radio->usbdev->dev,
 462                                          "Radio did not respond properly\n");
 463                                 return -EBUSY;
 464                         }
 465                 } else {
 466                         retval = dsbr100_start(radio);
 467                         if (retval < 0) {
 468                                 dev_warn(&radio->usbdev->dev,
 469                                          "Radio did not respond properly\n");
 470                                 return -EBUSY;
 471                         }
 472                 }
 473                 return 0;
 474         }
 475         return -EINVAL;
 476 }
 477
 478 static int vidioc_g_audio(struct file *file, void *priv,
 479                                 struct v4l2_audio *a)
 480 {
 481         if (a->index > 1)
 482                 return -EINVAL;
 483
 484         strcpy(a->name, "Radio");
 485         a->capability = V4L2_AUDCAP_STEREO;
 486         return 0;
 487 }
 488
 489 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 490 {
 491         *i = 0;
 492         return 0;
 493 }
 494
 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 static int vidioc_s_audio(struct file *file, void *priv,
 503                                         struct v4l2_audio *a)
 504 {
 505         if (a->index != 0)
 506                 return -EINVAL;
 507         return 0;
 508 }
 509
 510 /* USB subsystem interface begins here */
 511
 512 /*
 513  * Handle unplugging of the device.
 514  * We call video_unregister_device in any case.
 515  * The last function called in this procedure is
 516  * usb_dsbr100_video_device_release
 517  */
 518 static void usb_dsbr100_disconnect(struct usb_interface *intf)
 519 {
 520         struct dsbr100_device *radio = usb_get_intfdata(intf);
 521
 522         usb_set_intfdata(intf, NULL);
 523
 524         mutex_lock(&radio->v4l2_lock);
 525         radio->removed = 1;
 526         mutex_unlock(&radio->v4l2_lock);
 527
 528         video_unregister_device(&radio->videodev);
 529         v4l2_device_disconnect(&radio->v4l2_dev);
 530 }
 531
 532
 533 /* Suspend device - stop device. */
 534 static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message)
 535 {
 536         struct dsbr100_device *radio = usb_get_intfdata(intf);
 537         int retval;
 538
 539         mutex_lock(&radio->v4l2_lock);
 540         if (radio->status == STARTED) {
 541                 retval = dsbr100_stop(radio);
 542                 if (retval < 0)
 543                         dev_warn(&intf->dev, "dsbr100_stop failed\n");
 544
 545                 /* After dsbr100_stop() status set to STOPPED.
 546                  * If we want driver to start radio on resume
 547                  * we set status equal to STARTED.
 548                  * On resume we will check status and run radio if needed.
 549                  */
 550                 radio->status = STARTED;
 551         }
 552         mutex_unlock(&radio->v4l2_lock);
 553
 554         dev_info(&intf->dev, "going into suspend..\n");
 555
 556         return 0;
 557 }
 558
 559 /* Resume device - start device. */
 560 static int usb_dsbr100_resume(struct usb_interface *intf)
 561 {
 562         struct dsbr100_device *radio = usb_get_intfdata(intf);
 563         int retval;
 564
 565         mutex_lock(&radio->v4l2_lock);
 566         if (radio->status == STARTED) {
 567                 retval = dsbr100_start(radio);
 568                 if (retval < 0)
 569                         dev_warn(&intf->dev, "dsbr100_start failed\n");
 570         }
 571         mutex_unlock(&radio->v4l2_lock);
 572
 573         dev_info(&intf->dev, "coming out of suspend..\n");
 574
 575         return 0;
 576 }
 577
 578 /* free data structures */
 579 static void usb_dsbr100_video_device_release(struct video_device *videodev)
 580 {
 581         struct dsbr100_device *radio = videodev_to_radio(videodev);
 582
 583         v4l2_device_unregister(&radio->v4l2_dev);
 584         kfree(radio->transfer_buffer);
 585         kfree(radio);
 586 }
 587
 588 /* File system interface */
 589 static const struct v4l2_file_operations usb_dsbr100_fops = {
 590         .owner          = THIS_MODULE,
 591         .unlocked_ioctl = video_ioctl2,
 592 };
 593
 594 static const struct v4l2_ioctl_ops usb_dsbr100_ioctl_ops = {
 595         .vidioc_querycap    = vidioc_querycap,
 596         .vidioc_g_tuner     = vidioc_g_tuner,
 597         .vidioc_s_tuner     = vidioc_s_tuner,
 598         .vidioc_g_frequency = vidioc_g_frequency,
 599         .vidioc_s_frequency = vidioc_s_frequency,
 600         .vidioc_queryctrl   = vidioc_queryctrl,
 601         .vidioc_g_ctrl      = vidioc_g_ctrl,
 602         .vidioc_s_ctrl      = vidioc_s_ctrl,
 603         .vidioc_g_audio     = vidioc_g_audio,
 604         .vidioc_s_audio     = vidioc_s_audio,
 605         .vidioc_g_input     = vidioc_g_input,
 606         .vidioc_s_input     = vidioc_s_input,
 607 };
 608
 609 /* check if the device is present and register with v4l and usb if it is */
 610 static int usb_dsbr100_probe(struct usb_interface *intf,
 611                                 const struct usb_device_id *id)
 612 {
 613         struct dsbr100_device *radio;
 614         struct v4l2_device *v4l2_dev;
 615         int retval;
 616
 617         radio = kzalloc(sizeof(struct dsbr100_device), GFP_KERNEL);
 618
 619         if (!radio)
 620                 return -ENOMEM;
 621
 622         radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
 623
 624         if (!(radio->transfer_buffer)) {
 625                 kfree(radio);
 626                 return -ENOMEM;
 627         }
 628
 629         v4l2_dev = &radio->v4l2_dev;
 630
 631         retval = v4l2_device_register(&intf->dev, v4l2_dev);
 632         if (retval < 0) {
 633                 v4l2_err(v4l2_dev, "couldn't register v4l2_device\n");
 634                 kfree(radio->transfer_buffer);
 635                 kfree(radio);
 636                 return retval;
 637         }
 638
 639         mutex_init(&radio->v4l2_lock);
 640         strlcpy(radio->videodev.name, v4l2_dev->name, sizeof(radio->videodev.name));
 641         radio->videodev.v4l2_dev = v4l2_dev;
 642         radio->videodev.fops = &usb_dsbr100_fops;
 643         radio->videodev.ioctl_ops = &usb_dsbr100_ioctl_ops;
 644         radio->videodev.release = usb_dsbr100_video_device_release;
 645         radio->videodev.lock = &radio->v4l2_lock;
 646
 647         radio->removed = 0;
 648         radio->usbdev = interface_to_usbdev(intf);
 649         radio->curfreq = FREQ_MIN * FREQ_MUL;
 650         radio->status = STOPPED;
 651
 652         video_set_drvdata(&radio->videodev, radio);
 653
 654         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, radio_nr);
 655         if (retval < 0) {
 656                 v4l2_err(v4l2_dev, "couldn't register video device\n");
 657                 v4l2_device_unregister(v4l2_dev);
 658                 kfree(radio->transfer_buffer);
 659                 kfree(radio);
 660                 return -EIO;
 661         }
 662         usb_set_intfdata(intf, radio);
 663         return 0;
 664 }
 665
 666 static int __init dsbr100_init(void)
 667 {
 668         int retval = usb_register(&usb_dsbr100_driver);
 669         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 670                DRIVER_DESC "\n");
 671         return retval;
 672 }
 673
 674 static void __exit dsbr100_exit(void)
 675 {
 676         usb_deregister(&usb_dsbr100_driver);
 677 }
 678
 679 module_init (dsbr100_init);
 680 module_exit (dsbr100_exit);
 681
 682 MODULE_AUTHOR( DRIVER_AUTHOR );
 683 MODULE_DESCRIPTION( DRIVER_DESC );
 684 MODULE_LICENSE("GPL");