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 #define vdev_to_amradio(r) container_of(r, struct amradio_device, videodev)
 148
 149 /* USB Device ID List */
 150 static struct usb_device_id usb_amradio_device_table[] = {
 151         {USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
 152                                                         USB_CLASS_HID, 0, 0) },
 153         { }                                             /* Terminating entry */
 154 };
 155
 156 MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);
 157
 158 /* USB subsystem interface */
 159 static struct usb_driver usb_amradio_driver = {
 160         .name                   = MR800_DRIVER_NAME,
 161         .probe                  = usb_amradio_probe,
 162         .disconnect             = usb_amradio_disconnect,
 163         .suspend                = usb_amradio_suspend,
 164         .resume                 = usb_amradio_resume,
 165         .reset_resume           = usb_amradio_resume,
 166         .id_table               = usb_amradio_device_table,
 167         .supports_autosuspend   = 1,
 168 };
 169
 170 /* switch on/off the radio. Send 8 bytes to device */
 171 static int amradio_set_mute(struct amradio_device *radio, char argument)
 172 {
 173         int retval;
 174         int size;
 175
 176         BUG_ON(!mutex_is_locked(&radio->lock));
 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         BUG_ON(!mutex_is_locked(&radio->lock));
 208
 209         radio->buffer[0] = 0x00;
 210         radio->buffer[1] = 0x55;
 211         radio->buffer[2] = 0xaa;
 212         radio->buffer[3] = 0x03;
 213         radio->buffer[4] = AMRADIO_SET_FREQ;
 214         radio->buffer[5] = 0x00;
 215         radio->buffer[6] = 0x00;
 216         radio->buffer[7] = 0x08;
 217
 218         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 219                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 220
 221         if (retval < 0 || size != BUFFER_LENGTH)
 222                 goto out_err;
 223
 224         /* frequency is calculated from freq_send and placed in first 2 bytes */
 225         radio->buffer[0] = (freq_send >> 8) & 0xff;
 226         radio->buffer[1] = freq_send & 0xff;
 227         radio->buffer[2] = 0x01;
 228         radio->buffer[3] = 0x00;
 229         radio->buffer[4] = 0x00;
 230         /* 5 and 6 bytes of buffer already = 0x00 */
 231         radio->buffer[7] = 0x00;
 232
 233         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 234                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 235
 236         if (retval < 0 || size != BUFFER_LENGTH)
 237                 goto out_err;
 238
 239         radio->curfreq = freq;
 240         goto out;
 241
 242 out_err:
 243         amradio_dev_warn(&radio->videodev.dev, "set frequency failed\n");
 244 out:
 245         return retval;
 246 }
 247
 248 static int amradio_set_stereo(struct amradio_device *radio, char argument)
 249 {
 250         int retval;
 251         int size;
 252
 253         BUG_ON(!mutex_is_locked(&radio->lock));
 254
 255         radio->buffer[0] = 0x00;
 256         radio->buffer[1] = 0x55;
 257         radio->buffer[2] = 0xaa;
 258         radio->buffer[3] = 0x00;
 259         radio->buffer[4] = AMRADIO_SET_MONO;
 260         radio->buffer[5] = argument;
 261         radio->buffer[6] = 0x00;
 262         radio->buffer[7] = 0x00;
 263
 264         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 265                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 266
 267         if (retval < 0 || size != BUFFER_LENGTH) {
 268                 amradio_dev_warn(&radio->videodev.dev, "set stereo failed\n");
 269                 return retval;
 270         }
 271
 272         if (argument == WANT_STEREO)
 273                 radio->stereo = 1;
 274         else
 275                 radio->stereo = 0;
 276
 277         return retval;
 278 }
 279
 280 /* Handle unplugging the device.
 281  * We call video_unregister_device in any case.
 282  * The last function called in this procedure is
 283  * usb_amradio_device_release.
 284  */
 285 static void usb_amradio_disconnect(struct usb_interface *intf)
 286 {
 287         struct amradio_device *radio = usb_get_intfdata(intf);
 288
 289         mutex_lock(&radio->lock);
 290         radio->usbdev = NULL;
 291         mutex_unlock(&radio->lock);
 292
 293         usb_set_intfdata(intf, NULL);
 294         v4l2_device_disconnect(&radio->v4l2_dev);
 295         video_unregister_device(&radio->videodev);
 296 }
 297
 298 /* vidioc_querycap - query device capabilities */
 299 static int vidioc_querycap(struct file *file, void *priv,
 300                                         struct v4l2_capability *v)
 301 {
 302         struct amradio_device *radio = file->private_data;
 303
 304         strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
 305         strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
 306         usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
 307         v->version = RADIO_VERSION;
 308         v->capabilities = V4L2_CAP_TUNER;
 309         return 0;
 310 }
 311
 312 /* vidioc_g_tuner - get tuner attributes */
 313 static int vidioc_g_tuner(struct file *file, void *priv,
 314                                 struct v4l2_tuner *v)
 315 {
 316         struct amradio_device *radio = file->private_data;
 317         int retval;
 318
 319         if (v->index > 0)
 320                 return -EINVAL;
 321
 322 /* TODO: Add function which look is signal stereo or not
 323  *      amradio_getstat(radio);
 324  */
 325
 326 /* we call amradio_set_stereo to set radio->stereo
 327  * Honestly, amradio_getstat should cover this in future and
 328  * amradio_set_stereo shouldn't be here
 329  */
 330         retval = amradio_set_stereo(radio, WANT_STEREO);
 331
 332         strcpy(v->name, "FM");
 333         v->type = V4L2_TUNER_RADIO;
 334         v->rangelow = FREQ_MIN * FREQ_MUL;
 335         v->rangehigh = FREQ_MAX * FREQ_MUL;
 336         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 337         v->capability = V4L2_TUNER_CAP_LOW;
 338         if (radio->stereo)
 339                 v->audmode = V4L2_TUNER_MODE_STEREO;
 340         else
 341                 v->audmode = V4L2_TUNER_MODE_MONO;
 342         v->signal = 0xffff;     /* Can't get the signal strength, sad.. */
 343         v->afc = 0; /* Don't know what is this */
 344
 345         return retval;
 346 }
 347
 348 /* vidioc_s_tuner - set tuner attributes */
 349 static int vidioc_s_tuner(struct file *file, void *priv,
 350                                 struct v4l2_tuner *v)
 351 {
 352         struct amradio_device *radio = file->private_data;
 353         int retval = -EINVAL;
 354
 355         if (v->index > 0)
 356                 return -EINVAL;
 357
 358         /* mono/stereo selector */
 359         switch (v->audmode) {
 360         case V4L2_TUNER_MODE_MONO:
 361                 retval = amradio_set_stereo(radio, WANT_MONO);
 362                 break;
 363         case V4L2_TUNER_MODE_STEREO:
 364                 retval = amradio_set_stereo(radio, WANT_STEREO);
 365                 break;
 366         }
 367
 368         return retval;
 369 }
 370
 371 /* vidioc_s_frequency - set tuner radio frequency */
 372 static int vidioc_s_frequency(struct file *file, void *priv,
 373                                 struct v4l2_frequency *f)
 374 {
 375         struct amradio_device *radio = file->private_data;
 376
 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         f->type = V4L2_TUNER_RADIO;
 387         f->frequency = radio->curfreq;
 388
 389         return 0;
 390 }
 391
 392 /* vidioc_queryctrl - enumerate control items */
 393 static int vidioc_queryctrl(struct file *file, void *priv,
 394                                 struct v4l2_queryctrl *qc)
 395 {
 396         switch (qc->id) {
 397         case V4L2_CID_AUDIO_MUTE:
 398                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 399         }
 400
 401         return -EINVAL;
 402 }
 403
 404 /* vidioc_g_ctrl - get the value of a control */
 405 static int vidioc_g_ctrl(struct file *file, void *priv,
 406                                 struct v4l2_control *ctrl)
 407 {
 408         struct amradio_device *radio = file->private_data;
 409
 410         switch (ctrl->id) {
 411         case V4L2_CID_AUDIO_MUTE:
 412                 ctrl->value = radio->muted;
 413                 return 0;
 414         }
 415
 416         return -EINVAL;
 417 }
 418
 419 /* vidioc_s_ctrl - set the value of a control */
 420 static int vidioc_s_ctrl(struct file *file, void *priv,
 421                                 struct v4l2_control *ctrl)
 422 {
 423         struct amradio_device *radio = file->private_data;
 424         int retval = -EINVAL;
 425
 426         switch (ctrl->id) {
 427         case V4L2_CID_AUDIO_MUTE:
 428                 if (ctrl->value)
 429                         retval = amradio_set_mute(radio, AMRADIO_STOP);
 430                 else
 431                         retval = amradio_set_mute(radio, AMRADIO_START);
 432
 433                 break;
 434         }
 435
 436         return retval;
 437 }
 438
 439 /* vidioc_g_audio - get audio attributes */
 440 static int vidioc_g_audio(struct file *file, void *priv,
 441                                 struct v4l2_audio *a)
 442 {
 443         if (a->index > 1)
 444                 return -EINVAL;
 445
 446         strcpy(a->name, "Radio");
 447         a->capability = V4L2_AUDCAP_STEREO;
 448         return 0;
 449 }
 450
 451 /* vidioc_s_audio - set audio attributes  */
 452 static int vidioc_s_audio(struct file *file, void *priv,
 453                                         struct v4l2_audio *a)
 454 {
 455         if (a->index != 0)
 456                 return -EINVAL;
 457         return 0;
 458 }
 459
 460 /* vidioc_g_input - get input */
 461 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 462 {
 463         *i = 0;
 464         return 0;
 465 }
 466
 467 /* vidioc_s_input - set input */
 468 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 469 {
 470         if (i != 0)
 471                 return -EINVAL;
 472         return 0;
 473 }
 474
 475 static int usb_amradio_init(struct amradio_device *radio)
 476 {
 477         int retval;
 478
 479         retval = amradio_set_mute(radio, AMRADIO_STOP);
 480         if (retval)
 481                 goto out_err;
 482
 483         retval = amradio_set_stereo(radio, WANT_STEREO);
 484         if (retval)
 485                 goto out_err;
 486
 487         radio->initialized = 1;
 488         goto out;
 489
 490 out_err:
 491         amradio_dev_err(&radio->videodev.dev, "initialization failed\n");
 492 out:
 493         return retval;
 494 }
 495
 496 /* open device - amradio_start() and amradio_setfreq() */
 497 static int usb_amradio_open(struct file *file)
 498 {
 499         struct amradio_device *radio = vdev_to_amradio(video_devdata(file));
 500         int retval = 0;
 501
 502         mutex_lock(&radio->lock);
 503
 504         if (!radio->usbdev) {
 505                 retval = -EIO;
 506                 goto unlock;
 507         }
 508
 509         file->private_data = radio;
 510         retval = usb_autopm_get_interface(radio->intf);
 511         if (retval)
 512                 goto unlock;
 513
 514         if (unlikely(!radio->initialized)) {
 515                 retval = usb_amradio_init(radio);
 516                 if (retval)
 517                         usb_autopm_put_interface(radio->intf);
 518         }
 519
 520 unlock:
 521         mutex_unlock(&radio->lock);
 522         return retval;
 523 }
 524
 525 /*close device */
 526 static int usb_amradio_close(struct file *file)
 527 {
 528         struct amradio_device *radio = file->private_data;
 529         int retval = 0;
 530
 531         mutex_lock(&radio->lock);
 532
 533         if (!radio->usbdev)
 534                 retval = -EIO;
 535         else
 536                 usb_autopm_put_interface(radio->intf);
 537
 538         mutex_unlock(&radio->lock);
 539         return retval;
 540 }
 541
 542 static long usb_amradio_ioctl(struct file *file, unsigned int cmd,
 543                                 unsigned long arg)
 544 {
 545         struct amradio_device *radio = file->private_data;
 546         long retval = 0;
 547
 548         mutex_lock(&radio->lock);
 549
 550         if (!radio->usbdev) {
 551                 retval = -EIO;
 552                 goto unlock;
 553         }
 554
 555         retval = video_ioctl2(file, cmd, arg);
 556
 557 unlock:
 558         mutex_unlock(&radio->lock);
 559         return retval;
 560 }
 561
 562 /* Suspend device - stop device. Need to be checked and fixed */
 563 static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
 564 {
 565         struct amradio_device *radio = usb_get_intfdata(intf);
 566
 567         mutex_lock(&radio->lock);
 568
 569         if (!radio->muted && radio->initialized) {
 570                 amradio_set_mute(radio, AMRADIO_STOP);
 571                 radio->muted = 0;
 572         }
 573
 574         dev_info(&intf->dev, "going into suspend..\n");
 575
 576         mutex_unlock(&radio->lock);
 577         return 0;
 578 }
 579
 580 /* Resume device - start device. Need to be checked and fixed */
 581 static int usb_amradio_resume(struct usb_interface *intf)
 582 {
 583         struct amradio_device *radio = usb_get_intfdata(intf);
 584
 585         mutex_lock(&radio->lock);
 586
 587         if (unlikely(!radio->initialized))
 588                 goto unlock;
 589
 590         if (radio->stereo)
 591                 amradio_set_stereo(radio, WANT_STEREO);
 592         else
 593                 amradio_set_stereo(radio, WANT_MONO);
 594
 595         amradio_setfreq(radio, radio->curfreq);
 596
 597         if (!radio->muted)
 598                 amradio_set_mute(radio, AMRADIO_START);
 599
 600 unlock:
 601         dev_info(&intf->dev, "coming out of suspend..\n");
 602
 603         mutex_unlock(&radio->lock);
 604         return 0;
 605 }
 606
 607 /* File system interface */
 608 static const struct v4l2_file_operations usb_amradio_fops = {
 609         .owner          = THIS_MODULE,
 610         .open           = usb_amradio_open,
 611         .release        = usb_amradio_close,
 612         .ioctl          = usb_amradio_ioctl,
 613 };
 614
 615 static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = {
 616         .vidioc_querycap    = vidioc_querycap,
 617         .vidioc_g_tuner     = vidioc_g_tuner,
 618         .vidioc_s_tuner     = vidioc_s_tuner,
 619         .vidioc_g_frequency = vidioc_g_frequency,
 620         .vidioc_s_frequency = vidioc_s_frequency,
 621         .vidioc_queryctrl   = vidioc_queryctrl,
 622         .vidioc_g_ctrl      = vidioc_g_ctrl,
 623         .vidioc_s_ctrl      = vidioc_s_ctrl,
 624         .vidioc_g_audio     = vidioc_g_audio,
 625         .vidioc_s_audio     = vidioc_s_audio,
 626         .vidioc_g_input     = vidioc_g_input,
 627         .vidioc_s_input     = vidioc_s_input,
 628 };
 629
 630 static void usb_amradio_video_device_release(struct video_device *videodev)
 631 {
 632         struct amradio_device *radio = vdev_to_amradio(videodev);
 633
 634         v4l2_device_unregister(&radio->v4l2_dev);
 635
 636         /* free rest memory */
 637         kfree(radio->buffer);
 638         kfree(radio);
 639 }
 640
 641 /* check if the device is present and register with v4l and usb if it is */
 642 static int usb_amradio_probe(struct usb_interface *intf,
 643                                 const struct usb_device_id *id)
 644 {
 645         struct amradio_device *radio;
 646         int retval = 0;
 647
 648         radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL);
 649
 650         if (!radio) {
 651                 dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
 652                 retval = -ENOMEM;
 653                 goto err;
 654         }
 655
 656         radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
 657
 658         if (!radio->buffer) {
 659                 dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
 660                 retval = -ENOMEM;
 661                 goto err_nobuf;
 662         }
 663
 664         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
 665         if (retval < 0) {
 666                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
 667                 goto err_v4l2;
 668         }
 669
 670         strlcpy(radio->videodev.name, radio->v4l2_dev.name,
 671                 sizeof(radio->videodev.name));
 672         radio->videodev.v4l2_dev = &radio->v4l2_dev;
 673         radio->videodev.fops = &usb_amradio_fops;
 674         radio->videodev.ioctl_ops = &usb_amradio_ioctl_ops;
 675         radio->videodev.release = usb_amradio_video_device_release;
 676
 677         radio->usbdev = interface_to_usbdev(intf);
 678         radio->intf = intf;
 679         radio->curfreq = 95.16 * FREQ_MUL;
 680
 681         mutex_init(&radio->lock);
 682
 683         video_set_drvdata(&radio->videodev, radio);
 684
 685         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
 686                                         radio_nr);
 687         if (retval < 0) {
 688                 dev_err(&intf->dev, "could not register video device\n");
 689                 goto err_vdev;
 690         }
 691
 692         usb_set_intfdata(intf, radio);
 693         return 0;
 694
 695 err_vdev:
 696         v4l2_device_unregister(&radio->v4l2_dev);
 697 err_v4l2:
 698         kfree(radio->buffer);
 699 err_nobuf:
 700         kfree(radio);
 701 err:
 702         return retval;
 703 }
 704
 705 static int __init amradio_init(void)
 706 {
 707         int retval = usb_register(&usb_amradio_driver);
 708
 709         pr_info(KBUILD_MODNAME
 710                 ": version " DRIVER_VERSION " " DRIVER_DESC "\n");
 711
 712         if (retval)
 713                 pr_err(KBUILD_MODNAME
 714                         ": usb_register failed. Error number %d\n", retval);
 715
 716         return retval;
 717 }
 718
 719 static void __exit amradio_exit(void)
 720 {
 721         usb_deregister(&usb_amradio_driver);
 722 }
 723
 724 module_init(amradio_init);
 725 module_exit(amradio_exit);
 726