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 and contributors 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 through using their
  32  * achievements (specifications given).
  33  * Also, Faidon Liambotis <paravoid@debian.org> wrote nice driver for this radio
  34  * in 2007. He allowed to use his driver to improve current mr800 radio driver.
  35  * http://kerneltrap.org/mailarchive/linux-usb-devel/2007/10/11/342492
  36  *
  37  * Version 0.01:        First working version.
  38  *                      It's required to blacklist AverMedia USB Radio
  39  *                      in usbhid/hid-quirks.c
  40  * Version 0.10:        A lot of cleanups and fixes: unpluging the device,
  41  *                      few mutex locks were added, codinstyle issues, etc.
  42  *                      Added stereo support. Thanks to
  43  *                      Douglas Schilling Landgraf <dougsland@gmail.com> and
  44  *                      David Ellingsworth <david@identd.dyndns.org>
  45  *                      for discussion, help and support.
  46  * Version 0.11:        Converted to v4l2_device.
  47  *
  48  * Many things to do:
  49  *      - Correct power management of device (suspend & resume)
  50  *      - Add code for scanning and smooth tuning
  51  *      - Add code for sensitivity value
  52  *      - Correct mistakes
  53  *      - In Japan another FREQ_MIN and FREQ_MAX
  54  */
  55
  56 /* kernel includes */
  57 #include <linux/kernel.h>
  58 #include <linux/module.h>
  59 #include <linux/init.h>
  60 #include <linux/slab.h>
  61 #include <linux/smp_lock.h>
  62 #include <linux/input.h>
  63 #include <linux/videodev2.h>
  64 #include <media/v4l2-device.h>
  65 #include <media/v4l2-ioctl.h>
  66 #include <linux/usb.h>
  67 #include <linux/version.h>      /* for KERNEL_VERSION MACRO */
  68 #include <linux/mutex.h>
  69
  70 /* driver and module definitions */
  71 #define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>"
  72 #define DRIVER_DESC "AverMedia MR 800 USB FM radio driver"
  73 #define DRIVER_VERSION "0.11"
  74 #define RADIO_VERSION KERNEL_VERSION(0, 1, 1)
  75
  76 MODULE_AUTHOR(DRIVER_AUTHOR);
  77 MODULE_DESCRIPTION(DRIVER_DESC);
  78 MODULE_LICENSE("GPL");
  79
  80 #define USB_AMRADIO_VENDOR 0x07ca
  81 #define USB_AMRADIO_PRODUCT 0xb800
  82
  83 /* dev_warn macro with driver name */
  84 #define MR800_DRIVER_NAME "radio-mr800"
  85 #define amradio_dev_warn(dev, fmt, arg...)                              \
  86                 dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
  87
  88 #define amradio_dev_err(dev, fmt, arg...) \
  89                 dev_err(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
  90
  91 /* Probably USB_TIMEOUT should be modified in module parameter */
  92 #define BUFFER_LENGTH 8
  93 #define USB_TIMEOUT 500
  94
  95 /* Frequency limits in MHz -- these are European values.  For Japanese
  96 devices, that would be 76 and 91.  */
  97 #define FREQ_MIN  87.5
  98 #define FREQ_MAX 108.0
  99 #define FREQ_MUL 16000
 100
 101 /*
 102  * Commands that device should understand
 103  * List isnt full and will be updated with implementation of new functions
 104  */
 105 #define AMRADIO_SET_FREQ        0xa4
 106 #define AMRADIO_SET_MUTE        0xab
 107 #define AMRADIO_SET_MONO        0xae
 108
 109 /* Comfortable defines for amradio_set_mute */
 110 #define AMRADIO_START           0x00
 111 #define AMRADIO_STOP            0x01
 112
 113 /* Comfortable defines for amradio_set_stereo */
 114 #define WANT_STEREO             0x00
 115 #define WANT_MONO               0x01
 116
 117 /* module parameter */
 118 static int radio_nr = -1;
 119 module_param(radio_nr, int, 0);
 120 MODULE_PARM_DESC(radio_nr, "Radio Nr");
 121
 122 static int usb_amradio_probe(struct usb_interface *intf,
 123                              const struct usb_device_id *id);
 124 static void usb_amradio_disconnect(struct usb_interface *intf);
 125 static int usb_amradio_open(struct file *file);
 126 static int usb_amradio_close(struct file *file);
 127 static int usb_amradio_suspend(struct usb_interface *intf,
 128                                 pm_message_t message);
 129 static int usb_amradio_resume(struct usb_interface *intf);
 130
 131 /* Data for one (physical) device */
 132 struct amradio_device {
 133         /* reference to USB and video device */
 134         struct usb_device *usbdev;
 135         struct usb_interface *intf;
 136         struct video_device videodev;
 137         struct v4l2_device v4l2_dev;
 138
 139         unsigned char *buffer;
 140         struct mutex lock;      /* buffer locking */
 141         int curfreq;
 142         int stereo;
 143         int muted;
 144         int initialized;
 145 };
 146
 147 static inline struct amradio_device *to_amradio_dev(struct v4l2_device *v4l2_dev)
 148 {
 149         return container_of(v4l2_dev, struct amradio_device, v4l2_dev);
 150 }
 151
 152 /* USB Device ID List */
 153 static struct usb_device_id usb_amradio_device_table[] = {
 154         {USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
 155                                                         USB_CLASS_HID, 0, 0) },
 156         { }                                             /* Terminating entry */
 157 };
 158
 159 MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);
 160
 161 /* USB subsystem interface */
 162 static struct usb_driver usb_amradio_driver = {
 163         .name                   = MR800_DRIVER_NAME,
 164         .probe                  = usb_amradio_probe,
 165         .disconnect             = usb_amradio_disconnect,
 166         .suspend                = usb_amradio_suspend,
 167         .resume                 = usb_amradio_resume,
 168         .reset_resume           = usb_amradio_resume,
 169         .id_table               = usb_amradio_device_table,
 170         .supports_autosuspend   = 1,
 171 };
 172
 173 /* switch on/off the radio. Send 8 bytes to device */
 174 static int amradio_set_mute(struct amradio_device *radio, char argument)
 175 {
 176         int retval;
 177         int size;
 178
 179         radio->buffer[0] = 0x00;
 180         radio->buffer[1] = 0x55;
 181         radio->buffer[2] = 0xaa;
 182         radio->buffer[3] = 0x00;
 183         radio->buffer[4] = AMRADIO_SET_MUTE;
 184         radio->buffer[5] = argument;
 185         radio->buffer[6] = 0x00;
 186         radio->buffer[7] = 0x00;
 187
 188         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 189                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 190
 191         if (retval < 0 || size != BUFFER_LENGTH) {
 192                 amradio_dev_warn(&radio->videodev.dev, "set mute failed\n");
 193                 return retval;
 194         }
 195
 196         radio->muted = argument;
 197
 198         return retval;
 199 }
 200
 201 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 202 static int amradio_setfreq(struct amradio_device *radio, int freq)
 203 {
 204         int retval;
 205         int size;
 206         unsigned short freq_send = 0x10 + (freq >> 3) / 25;
 207
 208         radio->buffer[0] = 0x00;
 209         radio->buffer[1] = 0x55;
 210         radio->buffer[2] = 0xaa;
 211         radio->buffer[3] = 0x03;
 212         radio->buffer[4] = AMRADIO_SET_FREQ;
 213         radio->buffer[5] = 0x00;
 214         radio->buffer[6] = 0x00;
 215         radio->buffer[7] = 0x08;
 216
 217         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 218                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 219
 220         if (retval < 0 || size != BUFFER_LENGTH)
 221                 goto out_err;
 222
 223         /* frequency is calculated from freq_send and placed in first 2 bytes */
 224         radio->buffer[0] = (freq_send >> 8) & 0xff;
 225         radio->buffer[1] = freq_send & 0xff;
 226         radio->buffer[2] = 0x01;
 227         radio->buffer[3] = 0x00;
 228         radio->buffer[4] = 0x00;
 229         /* 5 and 6 bytes of buffer already = 0x00 */
 230         radio->buffer[7] = 0x00;
 231
 232         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 233                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 234
 235         if (retval < 0 || size != BUFFER_LENGTH)
 236                 goto out_err;
 237
 238         radio->curfreq = freq;
 239         goto out;
 240
 241 out_err:
 242         amradio_dev_warn(&radio->videodev.dev, "set frequency failed\n");
 243 out:
 244         return retval;
 245 }
 246
 247 static int amradio_set_stereo(struct amradio_device *radio, char argument)
 248 {
 249         int retval;
 250         int size;
 251
 252         radio->buffer[0] = 0x00;
 253         radio->buffer[1] = 0x55;
 254         radio->buffer[2] = 0xaa;
 255         radio->buffer[3] = 0x00;
 256         radio->buffer[4] = AMRADIO_SET_MONO;
 257         radio->buffer[5] = argument;
 258         radio->buffer[6] = 0x00;
 259         radio->buffer[7] = 0x00;
 260
 261         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 262                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 263
 264         if (retval < 0 || size != BUFFER_LENGTH) {
 265                 amradio_dev_warn(&radio->videodev.dev, "set stereo failed\n");
 266                 return retval;
 267         }
 268
 269         if (argument == WANT_STEREO)
 270                 radio->stereo = 1;
 271         else
 272                 radio->stereo = 0;
 273
 274         return retval;
 275 }
 276
 277 /* Handle unplugging the device.
 278  * We call video_unregister_device in any case.
 279  * The last function called in this procedure is
 280  * usb_amradio_device_release.
 281  */
 282 static void usb_amradio_disconnect(struct usb_interface *intf)
 283 {
 284         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 285
 286         mutex_lock(&radio->lock);
 287         /* increase the device node's refcount */
 288         get_device(&radio->videodev.dev);
 289         v4l2_device_disconnect(&radio->v4l2_dev);
 290         video_unregister_device(&radio->videodev);
 291         mutex_unlock(&radio->lock);
 292         /* decrease the device node's refcount, allowing it to be released */
 293         put_device(&radio->videodev.dev);
 294 }
 295
 296 /* vidioc_querycap - query device capabilities */
 297 static int vidioc_querycap(struct file *file, void *priv,
 298                                         struct v4l2_capability *v)
 299 {
 300         struct amradio_device *radio = file->private_data;
 301
 302         strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
 303         strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
 304         usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
 305         v->version = RADIO_VERSION;
 306         v->capabilities = V4L2_CAP_TUNER;
 307         return 0;
 308 }
 309
 310 /* vidioc_g_tuner - get tuner attributes */
 311 static int vidioc_g_tuner(struct file *file, void *priv,
 312                                 struct v4l2_tuner *v)
 313 {
 314         struct amradio_device *radio = file->private_data;
 315         int retval;
 316
 317         if (v->index > 0)
 318                 return -EINVAL;
 319
 320 /* TODO: Add function which look is signal stereo or not
 321  *      amradio_getstat(radio);
 322  */
 323
 324 /* we call amradio_set_stereo to set radio->stereo
 325  * Honestly, amradio_getstat should cover this in future and
 326  * amradio_set_stereo shouldn't be here
 327  */
 328         retval = amradio_set_stereo(radio, WANT_STEREO);
 329
 330         strcpy(v->name, "FM");
 331         v->type = V4L2_TUNER_RADIO;
 332         v->rangelow = FREQ_MIN * FREQ_MUL;
 333         v->rangehigh = FREQ_MAX * FREQ_MUL;
 334         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 335         v->capability = V4L2_TUNER_CAP_LOW;
 336         if (radio->stereo)
 337                 v->audmode = V4L2_TUNER_MODE_STEREO;
 338         else
 339                 v->audmode = V4L2_TUNER_MODE_MONO;
 340         v->signal = 0xffff;     /* Can't get the signal strength, sad.. */
 341         v->afc = 0; /* Don't know what is this */
 342
 343         return retval;
 344 }
 345
 346 /* vidioc_s_tuner - set tuner attributes */
 347 static int vidioc_s_tuner(struct file *file, void *priv,
 348                                 struct v4l2_tuner *v)
 349 {
 350         struct amradio_device *radio = file->private_data;
 351         int retval = -EINVAL;
 352
 353         if (v->index > 0)
 354                 return -EINVAL;
 355
 356         /* mono/stereo selector */
 357         switch (v->audmode) {
 358         case V4L2_TUNER_MODE_MONO:
 359                 retval = amradio_set_stereo(radio, WANT_MONO);
 360                 break;
 361         case V4L2_TUNER_MODE_STEREO:
 362                 retval = amradio_set_stereo(radio, WANT_STEREO);
 363                 break;
 364         }
 365
 366         return retval;
 367 }
 368
 369 /* vidioc_s_frequency - set tuner radio frequency */
 370 static int vidioc_s_frequency(struct file *file, void *priv,
 371                                 struct v4l2_frequency *f)
 372 {
 373         struct amradio_device *radio = file->private_data;
 374
 375         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 376                 return -EINVAL;
 377         return amradio_setfreq(radio, f->frequency);
 378 }
 379
 380 /* vidioc_g_frequency - get tuner radio frequency */
 381 static int vidioc_g_frequency(struct file *file, void *priv,
 382                                 struct v4l2_frequency *f)
 383 {
 384         struct amradio_device *radio = file->private_data;
 385
 386         if (f->tuner != 0)
 387                 return -EINVAL;
 388         f->type = V4L2_TUNER_RADIO;
 389         f->frequency = radio->curfreq;
 390
 391         return 0;
 392 }
 393
 394 /* vidioc_queryctrl - enumerate control items */
 395 static int vidioc_queryctrl(struct file *file, void *priv,
 396                                 struct v4l2_queryctrl *qc)
 397 {
 398         switch (qc->id) {
 399         case V4L2_CID_AUDIO_MUTE:
 400                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 401         }
 402
 403         return -EINVAL;
 404 }
 405
 406 /* vidioc_g_ctrl - get the value of a control */
 407 static int vidioc_g_ctrl(struct file *file, void *priv,
 408                                 struct v4l2_control *ctrl)
 409 {
 410         struct amradio_device *radio = file->private_data;
 411
 412         switch (ctrl->id) {
 413         case V4L2_CID_AUDIO_MUTE:
 414                 ctrl->value = radio->muted;
 415                 return 0;
 416         }
 417
 418         return -EINVAL;
 419 }
 420
 421 /* vidioc_s_ctrl - set the value of a control */
 422 static int vidioc_s_ctrl(struct file *file, void *priv,
 423                                 struct v4l2_control *ctrl)
 424 {
 425         struct amradio_device *radio = file->private_data;
 426         int retval = -EINVAL;
 427
 428         switch (ctrl->id) {
 429         case V4L2_CID_AUDIO_MUTE:
 430                 if (ctrl->value)
 431                         retval = amradio_set_mute(radio, AMRADIO_STOP);
 432                 else
 433                         retval = amradio_set_mute(radio, AMRADIO_START);
 434
 435                 break;
 436         }
 437
 438         return retval;
 439 }
 440
 441 /* vidioc_g_audio - get audio attributes */
 442 static int vidioc_g_audio(struct file *file, void *priv,
 443                                 struct v4l2_audio *a)
 444 {
 445         if (a->index > 1)
 446                 return -EINVAL;
 447
 448         strcpy(a->name, "Radio");
 449         a->capability = V4L2_AUDCAP_STEREO;
 450         return 0;
 451 }
 452
 453 /* vidioc_s_audio - set audio attributes  */
 454 static int vidioc_s_audio(struct file *file, void *priv,
 455                                         struct v4l2_audio *a)
 456 {
 457         if (a->index != 0)
 458                 return -EINVAL;
 459         return 0;
 460 }
 461
 462 /* vidioc_g_input - get input */
 463 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 464 {
 465         *i = 0;
 466         return 0;
 467 }
 468
 469 /* vidioc_s_input - set input */
 470 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 471 {
 472         if (i != 0)
 473                 return -EINVAL;
 474         return 0;
 475 }
 476
 477 static int usb_amradio_init(struct amradio_device *radio)
 478 {
 479         int retval;
 480
 481         retval = amradio_set_mute(radio, AMRADIO_STOP);
 482         if (retval)
 483                 goto out_err;
 484
 485         retval = amradio_set_stereo(radio, WANT_STEREO);
 486         if (retval)
 487                 goto out_err;
 488
 489         radio->initialized = 1;
 490         goto out;
 491
 492 out_err:
 493         amradio_dev_err(&radio->videodev.dev, "initialization failed\n");
 494 out:
 495         return retval;
 496 }
 497
 498 /* open device - amradio_start() and amradio_setfreq() */
 499 static int usb_amradio_open(struct file *file)
 500 {
 501         struct amradio_device *radio = video_drvdata(file);
 502         int retval;
 503
 504         file->private_data = radio;
 505         retval = usb_autopm_get_interface(radio->intf);
 506         if (retval)
 507                 return retval;
 508
 509         if (unlikely(!radio->initialized)) {
 510                 retval = usb_amradio_init(radio);
 511                 if (retval)
 512                         usb_autopm_put_interface(radio->intf);
 513         }
 514         return retval;
 515 }
 516
 517 /*close device */
 518 static int usb_amradio_close(struct file *file)
 519 {
 520         struct amradio_device *radio = file->private_data;
 521
 522         if (video_is_registered(&radio->videodev))
 523                 usb_autopm_put_interface(radio->intf);
 524         return 0;
 525 }
 526
 527 /* Suspend device - stop device. Need to be checked and fixed */
 528 static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
 529 {
 530         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 531
 532         mutex_lock(&radio->lock);
 533         if (!radio->muted && radio->initialized) {
 534                 amradio_set_mute(radio, AMRADIO_STOP);
 535                 radio->muted = 0;
 536         }
 537         mutex_unlock(&radio->lock);
 538
 539         dev_info(&intf->dev, "going into suspend..\n");
 540         return 0;
 541 }
 542
 543 /* Resume device - start device. Need to be checked and fixed */
 544 static int usb_amradio_resume(struct usb_interface *intf)
 545 {
 546         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 547
 548         mutex_lock(&radio->lock);
 549         if (unlikely(!radio->initialized))
 550                 goto unlock;
 551
 552         if (radio->stereo)
 553                 amradio_set_stereo(radio, WANT_STEREO);
 554         else
 555                 amradio_set_stereo(radio, WANT_MONO);
 556
 557         amradio_setfreq(radio, radio->curfreq);
 558
 559         if (!radio->muted)
 560                 amradio_set_mute(radio, AMRADIO_START);
 561
 562 unlock:
 563         mutex_unlock(&radio->lock);
 564
 565         dev_info(&intf->dev, "coming out of suspend..\n");
 566         return 0;
 567 }
 568
 569 /* File system interface */
 570 static const struct v4l2_file_operations usb_amradio_fops = {
 571         .owner          = THIS_MODULE,
 572         .open           = usb_amradio_open,
 573         .release        = usb_amradio_close,
 574         .unlocked_ioctl = video_ioctl2,
 575 };
 576
 577 static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = {
 578         .vidioc_querycap    = vidioc_querycap,
 579         .vidioc_g_tuner     = vidioc_g_tuner,
 580         .vidioc_s_tuner     = vidioc_s_tuner,
 581         .vidioc_g_frequency = vidioc_g_frequency,
 582         .vidioc_s_frequency = vidioc_s_frequency,
 583         .vidioc_queryctrl   = vidioc_queryctrl,
 584         .vidioc_g_ctrl      = vidioc_g_ctrl,
 585         .vidioc_s_ctrl      = vidioc_s_ctrl,
 586         .vidioc_g_audio     = vidioc_g_audio,
 587         .vidioc_s_audio     = vidioc_s_audio,
 588         .vidioc_g_input     = vidioc_g_input,
 589         .vidioc_s_input     = vidioc_s_input,
 590 };
 591
 592 static void usb_amradio_video_device_release(struct video_device *videodev)
 593 {
 594         struct amradio_device *radio = video_get_drvdata(videodev);
 595
 596         /* free rest memory */
 597         kfree(radio->buffer);
 598         kfree(radio);
 599 }
 600
 601 /* check if the device is present and register with v4l and usb if it is */
 602 static int usb_amradio_probe(struct usb_interface *intf,
 603                                 const struct usb_device_id *id)
 604 {
 605         struct amradio_device *radio;
 606         int retval = 0;
 607
 608         radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL);
 609
 610         if (!radio) {
 611                 dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
 612                 retval = -ENOMEM;
 613                 goto err;
 614         }
 615
 616         radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
 617
 618         if (!radio->buffer) {
 619                 dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
 620                 retval = -ENOMEM;
 621                 goto err_nobuf;
 622         }
 623
 624         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
 625         if (retval < 0) {
 626                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
 627                 goto err_v4l2;
 628         }
 629
 630         mutex_init(&radio->lock);
 631
 632         strlcpy(radio->videodev.name, radio->v4l2_dev.name,
 633                 sizeof(radio->videodev.name));
 634         radio->videodev.v4l2_dev = &radio->v4l2_dev;
 635         radio->videodev.fops = &usb_amradio_fops;
 636         radio->videodev.ioctl_ops = &usb_amradio_ioctl_ops;
 637         radio->videodev.release = usb_amradio_video_device_release;
 638         radio->videodev.lock = &radio->lock;
 639
 640         radio->usbdev = interface_to_usbdev(intf);
 641         radio->intf = intf;
 642         radio->curfreq = 95.16 * FREQ_MUL;
 643
 644         video_set_drvdata(&radio->videodev, radio);
 645
 646         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
 647                                         radio_nr);
 648         if (retval < 0) {
 649                 dev_err(&intf->dev, "could not register video device\n");
 650                 goto err_vdev;
 651         }
 652
 653         return 0;
 654
 655 err_vdev:
 656         v4l2_device_unregister(&radio->v4l2_dev);
 657 err_v4l2:
 658         kfree(radio->buffer);
 659 err_nobuf:
 660         kfree(radio);
 661 err:
 662         return retval;
 663 }
 664
 665 static int __init amradio_init(void)
 666 {
 667         int retval = usb_register(&usb_amradio_driver);
 668
 669         pr_info(KBUILD_MODNAME
 670                 ": version " DRIVER_VERSION " " DRIVER_DESC "\n");
 671
 672         if (retval)
 673                 pr_err(KBUILD_MODNAME
 674                         ": usb_register failed. Error number %d\n", retval);
 675
 676         return retval;
 677 }
 678
 679 static void __exit amradio_exit(void)
 680 {
 681         usb_deregister(&usb_amradio_driver);
 682 }
 683
 684 module_init(amradio_init);
 685 module_exit(amradio_exit);
 686