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