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 0.44:
  37         Add suspend/resume functions, fix unplug of device,
  38         a lot of cleanups and fixes by Alexey Klimov <klimov.linux@gmail.com>
  39
  40  Version 0.43:
  41         Oliver Neukum: avoided DMA coherency issue
  42
  43  Version 0.42:
  44         Converted dsbr100 to use video_ioctl2
  45         by Douglas Landgraf <dougsland@gmail.com>
  46
  47  Version 0.41-ac1:
  48         Alan Cox: Some cleanups and fixes
  49
  50  Version 0.41:
  51         Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  52
  53  Version 0.40:
  54         Markus: Updates for 2.6.x kernels, code layout changes, name sanitizing
  55
  56  Version 0.30:
  57         Markus: Updates for 2.5.x kernel and more ISO compliant source
  58
  59  Version 0.25:
  60         PSL and Markus: Cleanup, radio now doesn't stop on device close
  61
  62  Version 0.24:
  63         Markus: Hope I got these silly VIDEO_TUNER_LOW issues finally
  64         right.  Some minor cleanup, improved standalone compilation
  65
  66  Version 0.23:
  67         Markus: Sign extension bug fixed by declaring transfer_buffer unsigned
  68
  69  Version 0.22:
  70         Markus: Some (brown bag) cleanup in what VIDIOCSTUNER returns,
  71         thanks to Mike Cox for pointing the problem out.
  72
  73  Version 0.21:
  74         Markus: Minor cleanup, warnings if something goes wrong, lame attempt
  75         to adhere to Documentation/CodingStyle
  76
  77  Version 0.2:
  78         Brad Hards <bradh@dynamite.com.au>: Fixes to make it work as non-module
  79         Markus: Copyright clarification
  80
  81  Version 0.01: Markus: initial release
  82
  83 */
  84
  85 #include <linux/kernel.h>
  86 #include <linux/module.h>
  87 #include <linux/init.h>
  88 #include <linux/slab.h>
  89 #include <linux/input.h>
  90 #include <linux/videodev2.h>
  91 #include <media/v4l2-common.h>
  92 #include <media/v4l2-ioctl.h>
  93 #include <linux/usb.h>
  94
  95 /*
  96  * Version Information
  97  */
  98 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  99
 100 #define DRIVER_VERSION "v0.44"
 101 #define RADIO_VERSION KERNEL_VERSION(0, 4, 4)
 102
 103 static struct v4l2_queryctrl radio_qctrl[] = {
 104         {
 105                 .id            = V4L2_CID_AUDIO_MUTE,
 106                 .name          = "Mute",
 107                 .minimum       = 0,
 108                 .maximum       = 1,
 109                 .default_value = 1,
 110                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 111         },
 112 /* HINT: the disabled controls are only here to satify kradio and such apps */
 113         {       .id             = V4L2_CID_AUDIO_VOLUME,
 114                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 115         },
 116         {
 117                 .id             = V4L2_CID_AUDIO_BALANCE,
 118                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 119         },
 120         {
 121                 .id             = V4L2_CID_AUDIO_BASS,
 122                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 123         },
 124         {
 125                 .id             = V4L2_CID_AUDIO_TREBLE,
 126                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 127         },
 128         {
 129                 .id             = V4L2_CID_AUDIO_LOUDNESS,
 130                 .flags          = V4L2_CTRL_FLAG_DISABLED,
 131         },
 132 };
 133
 134 #define DRIVER_AUTHOR "Markus Demleitner <msdemlei@tucana.harvard.edu>"
 135 #define DRIVER_DESC "D-Link DSB-R100 USB FM radio driver"
 136
 137 #define DSB100_VENDOR 0x04b4
 138 #define DSB100_PRODUCT 0x1002
 139
 140 /* Commands the device appears to understand */
 141 #define DSB100_TUNE 1
 142 #define DSB100_ONOFF 2
 143
 144 #define TB_LEN 16
 145
 146 /* Frequency limits in MHz -- these are European values.  For Japanese
 147 devices, that would be 76 and 91.  */
 148 #define FREQ_MIN  87.5
 149 #define FREQ_MAX 108.0
 150 #define FREQ_MUL 16000
 151
 152 #define videodev_to_radio(d) container_of(d, struct dsbr100_device, videodev)
 153
 154 static int usb_dsbr100_probe(struct usb_interface *intf,
 155                              const struct usb_device_id *id);
 156 static void usb_dsbr100_disconnect(struct usb_interface *intf);
 157 static int usb_dsbr100_open(struct file *file);
 158 static int usb_dsbr100_close(struct file *file);
 159 static int usb_dsbr100_suspend(struct usb_interface *intf,
 160                                                 pm_message_t message);
 161 static int usb_dsbr100_resume(struct usb_interface *intf);
 162
 163 static int radio_nr = -1;
 164 module_param(radio_nr, int, 0);
 165
 166 /* Data for one (physical) device */
 167 struct dsbr100_device {
 168         struct usb_device *usbdev;
 169         struct video_device videodev;
 170         u8 *transfer_buffer;
 171         struct mutex lock;      /* buffer locking */
 172         int curfreq;
 173         int stereo;
 174         int users;
 175         int removed;
 176         int muted;
 177 };
 178
 179 static struct usb_device_id usb_dsbr100_device_table [] = {
 180         { USB_DEVICE(DSB100_VENDOR, DSB100_PRODUCT) },
 181         { }                                             /* Terminating entry */
 182 };
 183
 184 MODULE_DEVICE_TABLE (usb, usb_dsbr100_device_table);
 185
 186 /* USB subsystem interface */
 187 static struct usb_driver usb_dsbr100_driver = {
 188         .name                   = "dsbr100",
 189         .probe                  = usb_dsbr100_probe,
 190         .disconnect             = usb_dsbr100_disconnect,
 191         .id_table               = usb_dsbr100_device_table,
 192         .suspend                = usb_dsbr100_suspend,
 193         .resume                 = usb_dsbr100_resume,
 194         .reset_resume           = usb_dsbr100_resume,
 195         .supports_autosuspend   = 0,
 196 };
 197
 198 /* Low-level device interface begins here */
 199
 200 /* switch on radio */
 201 static int dsbr100_start(struct dsbr100_device *radio)
 202 {
 203         int retval;
 204         int request;
 205
 206         mutex_lock(&radio->lock);
 207
 208         retval = usb_control_msg(radio->usbdev,
 209                 usb_rcvctrlpipe(radio->usbdev, 0),
 210                 USB_REQ_GET_STATUS,
 211                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 212                 0x00, 0xC7, radio->transfer_buffer, 8, 300);
 213
 214         if (retval < 0) {
 215                 request = USB_REQ_GET_STATUS;
 216                 goto usb_control_msg_failed;
 217         }
 218
 219         retval = usb_control_msg(radio->usbdev,
 220                 usb_rcvctrlpipe(radio->usbdev, 0),
 221                 DSB100_ONOFF,
 222                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 223                 0x01, 0x00, radio->transfer_buffer, 8, 300);
 224
 225         if (retval < 0) {
 226                 request = DSB100_ONOFF;
 227                 goto usb_control_msg_failed;
 228         }
 229
 230         radio->muted = 0;
 231         mutex_unlock(&radio->lock);
 232         return (radio->transfer_buffer)[0];
 233
 234 usb_control_msg_failed:
 235         mutex_unlock(&radio->lock);
 236         dev_err(&radio->usbdev->dev,
 237                 "%s - usb_control_msg returned %i, request %i\n",
 238                         __func__, retval, request);
 239         return retval;
 240
 241 }
 242
 243 /* switch off radio */
 244 static int dsbr100_stop(struct dsbr100_device *radio)
 245 {
 246         int retval;
 247         int request;
 248
 249         mutex_lock(&radio->lock);
 250
 251         retval = usb_control_msg(radio->usbdev,
 252                 usb_rcvctrlpipe(radio->usbdev, 0),
 253                 USB_REQ_GET_STATUS,
 254                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 255                 0x16, 0x1C, radio->transfer_buffer, 8, 300);
 256
 257         if (retval < 0) {
 258                 request = USB_REQ_GET_STATUS;
 259                 goto usb_control_msg_failed;
 260         }
 261
 262         retval = usb_control_msg(radio->usbdev,
 263                 usb_rcvctrlpipe(radio->usbdev, 0),
 264                 DSB100_ONOFF,
 265                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 266                 0x00, 0x00, radio->transfer_buffer, 8, 300);
 267
 268         if (retval < 0) {
 269                 request = DSB100_ONOFF;
 270                 goto usb_control_msg_failed;
 271         }
 272
 273         radio->muted = 1;
 274         mutex_unlock(&radio->lock);
 275         return (radio->transfer_buffer)[0];
 276
 277 usb_control_msg_failed:
 278         mutex_unlock(&radio->lock);
 279         dev_err(&radio->usbdev->dev,
 280                 "%s - usb_control_msg returned %i, request %i\n",
 281                         __func__, retval, request);
 282         return retval;
 283
 284 }
 285
 286 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 287 static int dsbr100_setfreq(struct dsbr100_device *radio, int freq)
 288 {
 289         int retval;
 290         int request;
 291
 292         freq = (freq / 16 * 80) / 1000 + 856;
 293         mutex_lock(&radio->lock);
 294
 295         retval = usb_control_msg(radio->usbdev,
 296                 usb_rcvctrlpipe(radio->usbdev, 0),
 297                 DSB100_TUNE,
 298                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 299                 (freq >> 8) & 0x00ff, freq & 0xff,
 300                 radio->transfer_buffer, 8, 300);
 301
 302         if (retval < 0) {
 303                 request = DSB100_TUNE;
 304                 goto usb_control_msg_failed;
 305         }
 306
 307         retval = usb_control_msg(radio->usbdev,
 308                 usb_rcvctrlpipe(radio->usbdev, 0),
 309                 USB_REQ_GET_STATUS,
 310                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 311                 0x96, 0xB7, radio->transfer_buffer, 8, 300);
 312
 313         if (retval < 0) {
 314                 request = USB_REQ_GET_STATUS;
 315                 goto usb_control_msg_failed;
 316         }
 317
 318         retval = usb_control_msg(radio->usbdev,
 319                 usb_rcvctrlpipe(radio->usbdev, 0),
 320                 USB_REQ_GET_STATUS,
 321                 USB_TYPE_VENDOR | USB_RECIP_DEVICE |  USB_DIR_IN,
 322                 0x00, 0x24, radio->transfer_buffer, 8, 300);
 323
 324         if (retval < 0) {
 325                 request = USB_REQ_GET_STATUS;
 326                 goto usb_control_msg_failed;
 327         }
 328
 329         radio->stereo = !((radio->transfer_buffer)[0] & 0x01);
 330         mutex_unlock(&radio->lock);
 331         return (radio->transfer_buffer)[0];
 332
 333 usb_control_msg_failed:
 334         radio->stereo = -1;
 335         mutex_unlock(&radio->lock);
 336         dev_err(&radio->usbdev->dev,
 337                 "%s - usb_control_msg returned %i, request %i\n",
 338                         __func__, retval, request);
 339         return retval;
 340 }
 341
 342 /* return the device status.  This is, in effect, just whether it
 343 sees a stereo signal or not.  Pity. */
 344 static void dsbr100_getstat(struct dsbr100_device *radio)
 345 {
 346         int retval;
 347
 348         mutex_lock(&radio->lock);
 349
 350         retval = usb_control_msg(radio->usbdev,
 351                 usb_rcvctrlpipe(radio->usbdev, 0),
 352                 USB_REQ_GET_STATUS,
 353                 USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 354                 0x00 , 0x24, radio->transfer_buffer, 8, 300);
 355
 356         if (retval < 0) {
 357                 radio->stereo = -1;
 358                 dev_err(&radio->usbdev->dev,
 359                         "%s - usb_control_msg returned %i, request %i\n",
 360                                 __func__, retval, USB_REQ_GET_STATUS);
 361         } else {
 362                 radio->stereo = !(radio->transfer_buffer[0] & 0x01);
 363         }
 364
 365         mutex_unlock(&radio->lock);
 366 }
 367
 368 /* USB subsystem interface begins here */
 369
 370 /*
 371  * Handle unplugging of the device.
 372  * We call video_unregister_device in any case.
 373  * The last function called in this procedure is
 374  * usb_dsbr100_video_device_release
 375  */
 376 static void usb_dsbr100_disconnect(struct usb_interface *intf)
 377 {
 378         struct dsbr100_device *radio = usb_get_intfdata(intf);
 379
 380         usb_set_intfdata (intf, NULL);
 381
 382         mutex_lock(&radio->lock);
 383         radio->removed = 1;
 384         mutex_unlock(&radio->lock);
 385
 386         video_unregister_device(&radio->videodev);
 387 }
 388
 389
 390 static int vidioc_querycap(struct file *file, void *priv,
 391                                         struct v4l2_capability *v)
 392 {
 393         strlcpy(v->driver, "dsbr100", sizeof(v->driver));
 394         strlcpy(v->card, "D-Link R-100 USB FM Radio", sizeof(v->card));
 395         sprintf(v->bus_info, "USB");
 396         v->version = RADIO_VERSION;
 397         v->capabilities = V4L2_CAP_TUNER;
 398         return 0;
 399 }
 400
 401 static int vidioc_g_tuner(struct file *file, void *priv,
 402                                 struct v4l2_tuner *v)
 403 {
 404         struct dsbr100_device *radio = video_drvdata(file);
 405
 406         /* safety check */
 407         if (radio->removed)
 408                 return -EIO;
 409
 410         if (v->index > 0)
 411                 return -EINVAL;
 412
 413         dsbr100_getstat(radio);
 414         strcpy(v->name, "FM");
 415         v->type = V4L2_TUNER_RADIO;
 416         v->rangelow = FREQ_MIN * FREQ_MUL;
 417         v->rangehigh = FREQ_MAX * FREQ_MUL;
 418         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 419         v->capability = V4L2_TUNER_CAP_LOW;
 420         if(radio->stereo)
 421                 v->audmode = V4L2_TUNER_MODE_STEREO;
 422         else
 423                 v->audmode = V4L2_TUNER_MODE_MONO;
 424         v->signal = 0xffff;     /* We can't get the signal strength */
 425         return 0;
 426 }
 427
 428 static int vidioc_s_tuner(struct file *file, void *priv,
 429                                 struct v4l2_tuner *v)
 430 {
 431         struct dsbr100_device *radio = video_drvdata(file);
 432
 433         /* safety check */
 434         if (radio->removed)
 435                 return -EIO;
 436
 437         if (v->index > 0)
 438                 return -EINVAL;
 439
 440         return 0;
 441 }
 442
 443 static int vidioc_s_frequency(struct file *file, void *priv,
 444                                 struct v4l2_frequency *f)
 445 {
 446         struct dsbr100_device *radio = video_drvdata(file);
 447         int retval;
 448
 449         /* safety check */
 450         if (radio->removed)
 451                 return -EIO;
 452
 453         radio->curfreq = f->frequency;
 454         retval = dsbr100_setfreq(radio, radio->curfreq);
 455         if (retval < 0)
 456                 dev_warn(&radio->usbdev->dev, "Set frequency failed\n");
 457         return 0;
 458 }
 459
 460 static int vidioc_g_frequency(struct file *file, void *priv,
 461                                 struct v4l2_frequency *f)
 462 {
 463         struct dsbr100_device *radio = video_drvdata(file);
 464
 465         /* safety check */
 466         if (radio->removed)
 467                 return -EIO;
 468
 469         f->type = V4L2_TUNER_RADIO;
 470         f->frequency = radio->curfreq;
 471         return 0;
 472 }
 473
 474 static int vidioc_queryctrl(struct file *file, void *priv,
 475                                 struct v4l2_queryctrl *qc)
 476 {
 477         int i;
 478
 479         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 480                 if (qc->id && qc->id == radio_qctrl[i].id) {
 481                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 482                         return 0;
 483                 }
 484         }
 485         return -EINVAL;
 486 }
 487
 488 static int vidioc_g_ctrl(struct file *file, void *priv,
 489                                 struct v4l2_control *ctrl)
 490 {
 491         struct dsbr100_device *radio = video_drvdata(file);
 492
 493         /* safety check */
 494         if (radio->removed)
 495                 return -EIO;
 496
 497         switch (ctrl->id) {
 498         case V4L2_CID_AUDIO_MUTE:
 499                 ctrl->value = radio->muted;
 500                 return 0;
 501         }
 502         return -EINVAL;
 503 }
 504
 505 static int vidioc_s_ctrl(struct file *file, void *priv,
 506                                 struct v4l2_control *ctrl)
 507 {
 508         struct dsbr100_device *radio = video_drvdata(file);
 509         int retval;
 510
 511         /* safety check */
 512         if (radio->removed)
 513                 return -EIO;
 514
 515         switch (ctrl->id) {
 516         case V4L2_CID_AUDIO_MUTE:
 517                 if (ctrl->value) {
 518                         retval = dsbr100_stop(radio);
 519                         if (retval < 0) {
 520                                 dev_warn(&radio->usbdev->dev,
 521                                          "Radio did not respond properly\n");
 522                                 return -EBUSY;
 523                         }
 524                 } else {
 525                         retval = dsbr100_start(radio);
 526                         if (retval < 0) {
 527                                 dev_warn(&radio->usbdev->dev,
 528                                          "Radio did not respond properly\n");
 529                                 return -EBUSY;
 530                         }
 531                 }
 532                 return 0;
 533         }
 534         return -EINVAL;
 535 }
 536
 537 static int vidioc_g_audio(struct file *file, void *priv,
 538                                 struct v4l2_audio *a)
 539 {
 540         if (a->index > 1)
 541                 return -EINVAL;
 542
 543         strcpy(a->name, "Radio");
 544         a->capability = V4L2_AUDCAP_STEREO;
 545         return 0;
 546 }
 547
 548 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 549 {
 550         *i = 0;
 551         return 0;
 552 }
 553
 554 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 555 {
 556         if (i != 0)
 557                 return -EINVAL;
 558         return 0;
 559 }
 560
 561 static int vidioc_s_audio(struct file *file, void *priv,
 562                                         struct v4l2_audio *a)
 563 {
 564         if (a->index != 0)
 565                 return -EINVAL;
 566         return 0;
 567 }
 568
 569 static int usb_dsbr100_open(struct file *file)
 570 {
 571         struct dsbr100_device *radio = video_drvdata(file);
 572         int retval;
 573
 574         lock_kernel();
 575         radio->users = 1;
 576         radio->muted = 1;
 577
 578         retval = dsbr100_start(radio);
 579         if (retval < 0) {
 580                 dev_warn(&radio->usbdev->dev,
 581                          "Radio did not start up properly\n");
 582                 radio->users = 0;
 583                 unlock_kernel();
 584                 return -EIO;
 585         }
 586
 587         retval = dsbr100_setfreq(radio, radio->curfreq);
 588         if (retval < 0)
 589                 dev_warn(&radio->usbdev->dev,
 590                         "set frequency failed\n");
 591
 592         unlock_kernel();
 593         return 0;
 594 }
 595
 596 static int usb_dsbr100_close(struct file *file)
 597 {
 598         struct dsbr100_device *radio = video_drvdata(file);
 599         int retval;
 600
 601         if (!radio)
 602                 return -ENODEV;
 603
 604         radio->users = 0;
 605         if (!radio->removed) {
 606                 retval = dsbr100_stop(radio);
 607                 if (retval < 0) {
 608                         dev_warn(&radio->usbdev->dev,
 609                                 "dsbr100_stop failed\n");
 610                 }
 611
 612         }
 613         return 0;
 614 }
 615
 616 /* Suspend device - stop device. */
 617 static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message)
 618 {
 619         struct dsbr100_device *radio = usb_get_intfdata(intf);
 620         int retval;
 621
 622         retval = dsbr100_stop(radio);
 623         if (retval < 0)
 624                 dev_warn(&intf->dev, "dsbr100_stop failed\n");
 625
 626         dev_info(&intf->dev, "going into suspend..\n");
 627
 628         return 0;
 629 }
 630
 631 /* Resume device - start device. */
 632 static int usb_dsbr100_resume(struct usb_interface *intf)
 633 {
 634         struct dsbr100_device *radio = usb_get_intfdata(intf);
 635         int retval;
 636
 637         retval = dsbr100_start(radio);
 638         if (retval < 0)
 639                 dev_warn(&intf->dev, "dsbr100_start failed\n");
 640
 641         dev_info(&intf->dev, "coming out of suspend..\n");
 642
 643         return 0;
 644 }
 645
 646 /* free data structures */
 647 static void usb_dsbr100_video_device_release(struct video_device *videodev)
 648 {
 649         struct dsbr100_device *radio = videodev_to_radio(videodev);
 650
 651         kfree(radio->transfer_buffer);
 652         kfree(radio);
 653 }
 654
 655 /* File system interface */
 656 static const struct v4l2_file_operations usb_dsbr100_fops = {
 657         .owner          = THIS_MODULE,
 658         .open           = usb_dsbr100_open,
 659         .release        = usb_dsbr100_close,
 660         .ioctl          = video_ioctl2,
 661 };
 662
 663 static const struct v4l2_ioctl_ops usb_dsbr100_ioctl_ops = {
 664         .vidioc_querycap    = vidioc_querycap,
 665         .vidioc_g_tuner     = vidioc_g_tuner,
 666         .vidioc_s_tuner     = vidioc_s_tuner,
 667         .vidioc_g_frequency = vidioc_g_frequency,
 668         .vidioc_s_frequency = vidioc_s_frequency,
 669         .vidioc_queryctrl   = vidioc_queryctrl,
 670         .vidioc_g_ctrl      = vidioc_g_ctrl,
 671         .vidioc_s_ctrl      = vidioc_s_ctrl,
 672         .vidioc_g_audio     = vidioc_g_audio,
 673         .vidioc_s_audio     = vidioc_s_audio,
 674         .vidioc_g_input     = vidioc_g_input,
 675         .vidioc_s_input     = vidioc_s_input,
 676 };
 677
 678 /* V4L2 interface */
 679 static struct video_device dsbr100_videodev_data = {
 680         .name           = "D-Link DSB-R 100",
 681         .fops           = &usb_dsbr100_fops,
 682         .ioctl_ops      = &usb_dsbr100_ioctl_ops,
 683         .release        = usb_dsbr100_video_device_release,
 684 };
 685
 686 /* check if the device is present and register with v4l and usb if it is */
 687 static int usb_dsbr100_probe(struct usb_interface *intf,
 688                                 const struct usb_device_id *id)
 689 {
 690         struct dsbr100_device *radio;
 691         int retval;
 692
 693         radio = kmalloc(sizeof(struct dsbr100_device), GFP_KERNEL);
 694
 695         if (!radio)
 696                 return -ENOMEM;
 697
 698         radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
 699
 700         if (!(radio->transfer_buffer)) {
 701                 kfree(radio);
 702                 return -ENOMEM;
 703         }
 704
 705         mutex_init(&radio->lock);
 706         radio->videodev = dsbr100_videodev_data;
 707
 708         radio->removed = 0;
 709         radio->users = 0;
 710         radio->usbdev = interface_to_usbdev(intf);
 711         radio->curfreq = FREQ_MIN * FREQ_MUL;
 712         video_set_drvdata(&radio->videodev, radio);
 713         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, radio_nr);
 714         if (retval < 0) {
 715                 dev_err(&intf->dev, "couldn't register video device\n");
 716                 kfree(radio->transfer_buffer);
 717                 kfree(radio);
 718                 return -EIO;
 719         }
 720         usb_set_intfdata(intf, radio);
 721         return 0;
 722 }
 723
 724 static int __init dsbr100_init(void)
 725 {
 726         int retval = usb_register(&usb_dsbr100_driver);
 727         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 728                DRIVER_DESC "\n");
 729         return retval;
 730 }
 731
 732 static void __exit dsbr100_exit(void)
 733 {
 734         usb_deregister(&usb_dsbr100_driver);
 735 }
 736
 737 module_init (dsbr100_init);
 738 module_exit (dsbr100_exit);
 739
 740 MODULE_AUTHOR( DRIVER_AUTHOR );
 741 MODULE_DESCRIPTION( DRIVER_DESC );
 742 MODULE_LICENSE("GPL");