release/src-rt-6.x.4708/linux/linux-2.6.36/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         BUG_ON(!mutex_is_locked(&radio->lock));
 180
 181         radio->buffer[0] = 0x00;
 182         radio->buffer[1] = 0x55;
 183         radio->buffer[2] = 0xaa;
 184         radio->buffer[3] = 0x00;
 185         radio->buffer[4] = AMRADIO_SET_MUTE;
 186         radio->buffer[5] = argument;
 187         radio->buffer[6] = 0x00;
 188         radio->buffer[7] = 0x00;
 189
 190         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 191                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 192
 193         if (retval < 0 || size != BUFFER_LENGTH) {
 194                 amradio_dev_warn(&radio->videodev.dev, "set mute failed\n");
 195                 return retval;
 196         }
 197
 198         radio->muted = argument;
 199
 200         return retval;
 201 }
 202
 203 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 204 static int amradio_setfreq(struct amradio_device *radio, int freq)
 205 {
 206         int retval;
 207         int size;
 208         unsigned short freq_send = 0x10 + (freq >> 3) / 25;
 209
 210         BUG_ON(!mutex_is_locked(&radio->lock));
 211
 212         radio->buffer[0] = 0x00;
 213         radio->buffer[1] = 0x55;
 214         radio->buffer[2] = 0xaa;
 215         radio->buffer[3] = 0x03;
 216         radio->buffer[4] = AMRADIO_SET_FREQ;
 217         radio->buffer[5] = 0x00;
 218         radio->buffer[6] = 0x00;
 219         radio->buffer[7] = 0x08;
 220
 221         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 222                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 223
 224         if (retval < 0 || size != BUFFER_LENGTH)
 225                 goto out_err;
 226
 227         /* frequency is calculated from freq_send and placed in first 2 bytes */
 228         radio->buffer[0] = (freq_send >> 8) & 0xff;
 229         radio->buffer[1] = freq_send & 0xff;
 230         radio->buffer[2] = 0x01;
 231         radio->buffer[3] = 0x00;
 232         radio->buffer[4] = 0x00;
 233         /* 5 and 6 bytes of buffer already = 0x00 */
 234         radio->buffer[7] = 0x00;
 235
 236         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 237                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 238
 239         if (retval < 0 || size != BUFFER_LENGTH)
 240                 goto out_err;
 241
 242         radio->curfreq = freq;
 243         goto out;
 244
 245 out_err:
 246         amradio_dev_warn(&radio->videodev.dev, "set frequency failed\n");
 247 out:
 248         return retval;
 249 }
 250
 251 static int amradio_set_stereo(struct amradio_device *radio, char argument)
 252 {
 253         int retval;
 254         int size;
 255
 256         BUG_ON(!mutex_is_locked(&radio->lock));
 257
 258         radio->buffer[0] = 0x00;
 259         radio->buffer[1] = 0x55;
 260         radio->buffer[2] = 0xaa;
 261         radio->buffer[3] = 0x00;
 262         radio->buffer[4] = AMRADIO_SET_MONO;
 263         radio->buffer[5] = argument;
 264         radio->buffer[6] = 0x00;
 265         radio->buffer[7] = 0x00;
 266
 267         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 268                 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
 269
 270         if (retval < 0 || size != BUFFER_LENGTH) {
 271                 amradio_dev_warn(&radio->videodev.dev, "set stereo failed\n");
 272                 return retval;
 273         }
 274
 275         if (argument == WANT_STEREO)
 276                 radio->stereo = 1;
 277         else
 278                 radio->stereo = 0;
 279
 280         return retval;
 281 }
 282
 283 /* Handle unplugging the device.
 284  * We call video_unregister_device in any case.
 285  * The last function called in this procedure is
 286  * usb_amradio_device_release.
 287  */
 288 static void usb_amradio_disconnect(struct usb_interface *intf)
 289 {
 290         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 291
 292         mutex_lock(&radio->lock);
 293         radio->usbdev = NULL;
 294         mutex_unlock(&radio->lock);
 295
 296         v4l2_device_disconnect(&radio->v4l2_dev);
 297         video_unregister_device(&radio->videodev);
 298 }
 299
 300 /* vidioc_querycap - query device capabilities */
 301 static int vidioc_querycap(struct file *file, void *priv,
 302                                         struct v4l2_capability *v)
 303 {
 304         struct amradio_device *radio = file->private_data;
 305
 306         strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
 307         strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
 308         usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
 309         v->version = RADIO_VERSION;
 310         v->capabilities = V4L2_CAP_TUNER;
 311         return 0;
 312 }
 313
 314 /* vidioc_g_tuner - get tuner attributes */
 315 static int vidioc_g_tuner(struct file *file, void *priv,
 316                                 struct v4l2_tuner *v)
 317 {
 318         struct amradio_device *radio = file->private_data;
 319         int retval;
 320
 321         if (v->index > 0)
 322                 return -EINVAL;
 323
 324 /* TODO: Add function which look is signal stereo or not
 325  *      amradio_getstat(radio);
 326  */
 327
 328 /* we call amradio_set_stereo to set radio->stereo
 329  * Honestly, amradio_getstat should cover this in future and
 330  * amradio_set_stereo shouldn't be here
 331  */
 332         retval = amradio_set_stereo(radio, WANT_STEREO);
 333
 334         strcpy(v->name, "FM");
 335         v->type = V4L2_TUNER_RADIO;
 336         v->rangelow = FREQ_MIN * FREQ_MUL;
 337         v->rangehigh = FREQ_MAX * FREQ_MUL;
 338         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 339         v->capability = V4L2_TUNER_CAP_LOW;
 340         if (radio->stereo)
 341                 v->audmode = V4L2_TUNER_MODE_STEREO;
 342         else
 343                 v->audmode = V4L2_TUNER_MODE_MONO;
 344         v->signal = 0xffff;     /* Can't get the signal strength, sad.. */
 345         v->afc = 0; /* Don't know what is this */
 346
 347         return retval;
 348 }
 349
 350 /* vidioc_s_tuner - set tuner attributes */
 351 static int vidioc_s_tuner(struct file *file, void *priv,
 352                                 struct v4l2_tuner *v)
 353 {
 354         struct amradio_device *radio = file->private_data;
 355         int retval = -EINVAL;
 356
 357         if (v->index > 0)
 358                 return -EINVAL;
 359
 360         /* mono/stereo selector */
 361         switch (v->audmode) {
 362         case V4L2_TUNER_MODE_MONO:
 363                 retval = amradio_set_stereo(radio, WANT_MONO);
 364                 break;
 365         case V4L2_TUNER_MODE_STEREO:
 366                 retval = amradio_set_stereo(radio, WANT_STEREO);
 367                 break;
 368         }
 369
 370         return retval;
 371 }
 372
 373 /* vidioc_s_frequency - set tuner radio frequency */
 374 static int vidioc_s_frequency(struct file *file, void *priv,
 375                                 struct v4l2_frequency *f)
 376 {
 377         struct amradio_device *radio = file->private_data;
 378
 379         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 380                 return -EINVAL;
 381         return amradio_setfreq(radio, f->frequency);
 382 }
 383
 384 /* vidioc_g_frequency - get tuner radio frequency */
 385 static int vidioc_g_frequency(struct file *file, void *priv,
 386                                 struct v4l2_frequency *f)
 387 {
 388         struct amradio_device *radio = file->private_data;
 389
 390         if (f->tuner != 0)
 391                 return -EINVAL;
 392         f->type = V4L2_TUNER_RADIO;
 393         f->frequency = radio->curfreq;
 394
 395         return 0;
 396 }
 397
 398 /* vidioc_queryctrl - enumerate control items */
 399 static int vidioc_queryctrl(struct file *file, void *priv,
 400                                 struct v4l2_queryctrl *qc)
 401 {
 402         switch (qc->id) {
 403         case V4L2_CID_AUDIO_MUTE:
 404                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 405         }
 406
 407         return -EINVAL;
 408 }
 409
 410 /* vidioc_g_ctrl - get the value of a control */
 411 static int vidioc_g_ctrl(struct file *file, void *priv,
 412                                 struct v4l2_control *ctrl)
 413 {
 414         struct amradio_device *radio = file->private_data;
 415
 416         switch (ctrl->id) {
 417         case V4L2_CID_AUDIO_MUTE:
 418                 ctrl->value = radio->muted;
 419                 return 0;
 420         }
 421
 422         return -EINVAL;
 423 }
 424
 425 /* vidioc_s_ctrl - set the value of a control */
 426 static int vidioc_s_ctrl(struct file *file, void *priv,
 427                                 struct v4l2_control *ctrl)
 428 {
 429         struct amradio_device *radio = file->private_data;
 430         int retval = -EINVAL;
 431
 432         switch (ctrl->id) {
 433         case V4L2_CID_AUDIO_MUTE:
 434                 if (ctrl->value)
 435                         retval = amradio_set_mute(radio, AMRADIO_STOP);
 436                 else
 437                         retval = amradio_set_mute(radio, AMRADIO_START);
 438
 439                 break;
 440         }
 441
 442         return retval;
 443 }
 444
 445 /* vidioc_g_audio - get audio attributes */
 446 static int vidioc_g_audio(struct file *file, void *priv,
 447                                 struct v4l2_audio *a)
 448 {
 449         if (a->index > 1)
 450                 return -EINVAL;
 451
 452         strcpy(a->name, "Radio");
 453         a->capability = V4L2_AUDCAP_STEREO;
 454         return 0;
 455 }
 456
 457 /* vidioc_s_audio - set audio attributes  */
 458 static int vidioc_s_audio(struct file *file, void *priv,
 459                                         struct v4l2_audio *a)
 460 {
 461         if (a->index != 0)
 462                 return -EINVAL;
 463         return 0;
 464 }
 465
 466 /* vidioc_g_input - get input */
 467 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 468 {
 469         *i = 0;
 470         return 0;
 471 }
 472
 473 /* vidioc_s_input - set input */
 474 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 475 {
 476         if (i != 0)
 477                 return -EINVAL;
 478         return 0;
 479 }
 480
 481 static int usb_amradio_init(struct amradio_device *radio)
 482 {
 483         int retval;
 484
 485         retval = amradio_set_mute(radio, AMRADIO_STOP);
 486         if (retval)
 487                 goto out_err;
 488
 489         retval = amradio_set_stereo(radio, WANT_STEREO);
 490         if (retval)
 491                 goto out_err;
 492
 493         radio->initialized = 1;
 494         goto out;
 495
 496 out_err:
 497         amradio_dev_err(&radio->videodev.dev, "initialization failed\n");
 498 out:
 499         return retval;
 500 }
 501
 502 /* open device - amradio_start() and amradio_setfreq() */
 503 static int usb_amradio_open(struct file *file)
 504 {
 505         struct amradio_device *radio = video_drvdata(file);
 506         int retval = 0;
 507
 508         mutex_lock(&radio->lock);
 509
 510         if (!radio->usbdev) {
 511                 retval = -EIO;
 512                 goto unlock;
 513         }
 514
 515         file->private_data = radio;
 516         retval = usb_autopm_get_interface(radio->intf);
 517         if (retval)
 518                 goto unlock;
 519
 520         if (unlikely(!radio->initialized)) {
 521                 retval = usb_amradio_init(radio);
 522                 if (retval)
 523                         usb_autopm_put_interface(radio->intf);
 524         }
 525
 526 unlock:
 527         mutex_unlock(&radio->lock);
 528         return retval;
 529 }
 530
 531 /*close device */
 532 static int usb_amradio_close(struct file *file)
 533 {
 534         struct amradio_device *radio = file->private_data;
 535         int retval = 0;
 536
 537         mutex_lock(&radio->lock);
 538
 539         if (!radio->usbdev)
 540                 retval = -EIO;
 541         else
 542                 usb_autopm_put_interface(radio->intf);
 543
 544         mutex_unlock(&radio->lock);
 545         return retval;
 546 }
 547
 548 static long usb_amradio_ioctl(struct file *file, unsigned int cmd,
 549                                 unsigned long arg)
 550 {
 551         struct amradio_device *radio = file->private_data;
 552         long retval = 0;
 553
 554         mutex_lock(&radio->lock);
 555
 556         if (!radio->usbdev) {
 557                 retval = -EIO;
 558                 goto unlock;
 559         }
 560
 561         retval = video_ioctl2(file, cmd, arg);
 562
 563 unlock:
 564         mutex_unlock(&radio->lock);
 565         return retval;
 566 }
 567
 568 /* Suspend device - stop device. Need to be checked and fixed */
 569 static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
 570 {
 571         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 572
 573         mutex_lock(&radio->lock);
 574
 575         if (!radio->muted && radio->initialized) {
 576                 amradio_set_mute(radio, AMRADIO_STOP);
 577                 radio->muted = 0;
 578         }
 579
 580         dev_info(&intf->dev, "going into suspend..\n");
 581
 582         mutex_unlock(&radio->lock);
 583         return 0;
 584 }
 585
 586 /* Resume device - start device. Need to be checked and fixed */
 587 static int usb_amradio_resume(struct usb_interface *intf)
 588 {
 589         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 590
 591         mutex_lock(&radio->lock);
 592
 593         if (unlikely(!radio->initialized))
 594                 goto unlock;
 595
 596         if (radio->stereo)
 597                 amradio_set_stereo(radio, WANT_STEREO);
 598         else
 599                 amradio_set_stereo(radio, WANT_MONO);
 600
 601         amradio_setfreq(radio, radio->curfreq);
 602
 603         if (!radio->muted)
 604                 amradio_set_mute(radio, AMRADIO_START);
 605
 606 unlock:
 607         dev_info(&intf->dev, "coming out of suspend..\n");
 608
 609         mutex_unlock(&radio->lock);
 610         return 0;
 611 }
 612
 613 /* File system interface */
 614 static const struct v4l2_file_operations usb_amradio_fops = {
 615         .owner          = THIS_MODULE,
 616         .open           = usb_amradio_open,
 617         .release        = usb_amradio_close,
 618         .ioctl          = usb_amradio_ioctl,
 619 };
 620
 621 static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = {
 622         .vidioc_querycap    = vidioc_querycap,
 623         .vidioc_g_tuner     = vidioc_g_tuner,
 624         .vidioc_s_tuner     = vidioc_s_tuner,
 625         .vidioc_g_frequency = vidioc_g_frequency,
 626         .vidioc_s_frequency = vidioc_s_frequency,
 627         .vidioc_queryctrl   = vidioc_queryctrl,
 628         .vidioc_g_ctrl      = vidioc_g_ctrl,
 629         .vidioc_s_ctrl      = vidioc_s_ctrl,
 630         .vidioc_g_audio     = vidioc_g_audio,
 631         .vidioc_s_audio     = vidioc_s_audio,
 632         .vidioc_g_input     = vidioc_g_input,
 633         .vidioc_s_input     = vidioc_s_input,
 634 };
 635
 636 static void usb_amradio_video_device_release(struct video_device *videodev)
 637 {
 638         struct amradio_device *radio = video_get_drvdata(videodev);
 639
 640         /* free rest memory */
 641         kfree(radio->buffer);
 642         kfree(radio);
 643 }
 644
 645 /* check if the device is present and register with v4l and usb if it is */
 646 static int usb_amradio_probe(struct usb_interface *intf,
 647                                 const struct usb_device_id *id)
 648 {
 649         struct amradio_device *radio;
 650         int retval = 0;
 651
 652         radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL);
 653
 654         if (!radio) {
 655                 dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
 656                 retval = -ENOMEM;
 657                 goto err;
 658         }
 659
 660         radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
 661
 662         if (!radio->buffer) {
 663                 dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
 664                 retval = -ENOMEM;
 665                 goto err_nobuf;
 666         }
 667
 668         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
 669         if (retval < 0) {
 670                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
 671                 goto err_v4l2;
 672         }
 673
 674         strlcpy(radio->videodev.name, radio->v4l2_dev.name,
 675                 sizeof(radio->videodev.name));
 676         radio->videodev.v4l2_dev = &radio->v4l2_dev;
 677         radio->videodev.fops = &usb_amradio_fops;
 678         radio->videodev.ioctl_ops = &usb_amradio_ioctl_ops;
 679         radio->videodev.release = usb_amradio_video_device_release;
 680
 681         radio->usbdev = interface_to_usbdev(intf);
 682         radio->intf = intf;
 683         radio->curfreq = 95.16 * FREQ_MUL;
 684
 685         mutex_init(&radio->lock);
 686
 687         video_set_drvdata(&radio->videodev, radio);
 688
 689         retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
 690                                         radio_nr);
 691         if (retval < 0) {
 692                 dev_err(&intf->dev, "could not register video device\n");
 693                 goto err_vdev;
 694         }
 695
 696         return 0;
 697
 698 err_vdev:
 699         v4l2_device_unregister(&radio->v4l2_dev);
 700 err_v4l2:
 701         kfree(radio->buffer);
 702 err_nobuf:
 703         kfree(radio);
 704 err:
 705         return retval;
 706 }
 707
 708 static int __init amradio_init(void)
 709 {
 710         int retval = usb_register(&usb_amradio_driver);
 711
 712         pr_info(KBUILD_MODNAME
 713                 ": version " DRIVER_VERSION " " DRIVER_DESC "\n");
 714
 715         if (retval)
 716                 pr_err(KBUILD_MODNAME
 717                         ": usb_register failed. Error number %d\n", retval);
 718
 719         return retval;
 720 }
 721
 722 static void __exit amradio_exit(void)
 723 {
 724         usb_deregister(&usb_amradio_driver);
 725 }
 726
 727 module_init(amradio_init);
 728 module_exit(amradio_exit);