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
  20 /*
  21  * Big thanks to authors and contributors of dsbr100.c and radio-si470x.c
  22  *
  23  * When work was looked pretty good, i discover this:
  24  * http://av-usbradio.sourceforge.net/index.php
  25  * http://sourceforge.net/projects/av-usbradio/
  26  * Latest release of theirs project was in 2005.
  27  * Probably, this driver could be improved through using their
  28  * achievements (specifications given).
  29  * Also, Faidon Liambotis <paravoid@debian.org> wrote nice driver for this radio
  30  * in 2007. He allowed to use his driver to improve current mr800 radio driver.
  31  * http://www.spinics.net/lists/linux-usb-devel/msg10109.html
  32  *
  33  * Version 0.01:        First working version.
  34  *                      It's required to blacklist AverMedia USB Radio
  35  *                      in usbhid/hid-quirks.c
  36  * Version 0.10:        A lot of cleanups and fixes: unpluging the device,
  37  *                      few mutex locks were added, codinstyle issues, etc.
  38  *                      Added stereo support. Thanks to
  39  *                      Douglas Schilling Landgraf <dougsland@gmail.com> and
  40  *                      David Ellingsworth <david@identd.dyndns.org>
  41  *                      for discussion, help and support.
  42  * Version 0.11:        Converted to v4l2_device.
  43  *
  44  * Many things to do:
  45  *      - Correct power management of device (suspend & resume)
  46  *      - Add code for scanning and smooth tuning
  47  *      - Add code for sensitivity value
  48  *      - Correct mistakes
  49  *      - In Japan another FREQ_MIN and FREQ_MAX
  50  */
  51
  52 /* kernel includes */
  53 #include <linux/kernel.h>
  54 #include <linux/module.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #include <linux/input.h>
  58 #include <linux/videodev2.h>
  59 #include <media/v4l2-device.h>
  60 #include <media/v4l2-ioctl.h>
  61 #include <media/v4l2-ctrls.h>
  62 #include <media/v4l2-event.h>
  63 #include <linux/usb.h>
  64 #include <linux/mutex.h>
  65
  66 /* driver and module definitions */
  67 #define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>"
  68 #define DRIVER_DESC "AverMedia MR 800 USB FM radio driver"
  69 #define DRIVER_VERSION "0.1.2"
  70
  71 MODULE_AUTHOR(DRIVER_AUTHOR);
  72 MODULE_DESCRIPTION(DRIVER_DESC);
  73 MODULE_LICENSE("GPL");
  74 MODULE_VERSION(DRIVER_VERSION);
  75
  76 #define USB_AMRADIO_VENDOR 0x07ca
  77 #define USB_AMRADIO_PRODUCT 0xb800
  78
  79 /* dev_warn macro with driver name */
  80 #define MR800_DRIVER_NAME "radio-mr800"
  81 #define amradio_dev_warn(dev, fmt, arg...)                              \
  82                 dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
  83
  84 #define amradio_dev_err(dev, fmt, arg...) \
  85                 dev_err(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
  86
  87 /* Probably USB_TIMEOUT should be modified in module parameter */
  88 #define BUFFER_LENGTH 8
  89 #define USB_TIMEOUT 500
  90
  91 /* Frequency limits in MHz -- these are European values.  For Japanese
  92 devices, that would be 76 and 91.  */
  93 #define FREQ_MIN  87.5
  94 #define FREQ_MAX 108.0
  95 #define FREQ_MUL 16000
  96
  97 /*
  98  * Commands that device should understand
  99  * List isn't full and will be updated with implementation of new functions
 100  */
 101 #define AMRADIO_SET_FREQ        0xa4
 102 #define AMRADIO_GET_READY_FLAG  0xa5
 103 #define AMRADIO_GET_SIGNAL      0xa7
 104 #define AMRADIO_GET_FREQ        0xa8
 105 #define AMRADIO_SET_SEARCH_UP   0xa9
 106 #define AMRADIO_SET_SEARCH_DOWN 0xaa
 107 #define AMRADIO_SET_MUTE        0xab
 108 #define AMRADIO_SET_RIGHT_MUTE  0xac
 109 #define AMRADIO_SET_LEFT_MUTE   0xad
 110 #define AMRADIO_SET_MONO        0xae
 111 #define AMRADIO_SET_SEARCH_LVL  0xb0
 112 #define AMRADIO_STOP_SEARCH     0xb1
 113
 114 /* Comfortable defines for amradio_set_stereo */
 115 #define WANT_STEREO             0x00
 116 #define WANT_MONO               0x01
 117
 118 /* module parameter */
 119 static int radio_nr = -1;
 120 module_param(radio_nr, int, 0);
 121 MODULE_PARM_DESC(radio_nr, "Radio Nr");
 122
 123 /* Data for one (physical) device */
 124 struct amradio_device {
 125         /* reference to USB and video device */
 126         struct usb_device *usbdev;
 127         struct usb_interface *intf;
 128         struct video_device vdev;
 129         struct v4l2_device v4l2_dev;
 130         struct v4l2_ctrl_handler hdl;
 131
 132         u8 *buffer;
 133         struct mutex lock;      /* buffer locking */
 134         int curfreq;
 135         int stereo;
 136         int muted;
 137 };
 138
 139 static inline struct amradio_device *to_amradio_dev(struct v4l2_device *v4l2_dev)
 140 {
 141         return container_of(v4l2_dev, struct amradio_device, v4l2_dev);
 142 }
 143
 144 static int amradio_send_cmd(struct amradio_device *radio, u8 cmd, u8 arg,
 145                 u8 *extra, u8 extralen, bool reply)
 146 {
 147         int retval;
 148         int size;
 149
 150         radio->buffer[0] = 0x00;
 151         radio->buffer[1] = 0x55;
 152         radio->buffer[2] = 0xaa;
 153         radio->buffer[3] = extralen;
 154         radio->buffer[4] = cmd;
 155         radio->buffer[5] = arg;
 156         radio->buffer[6] = 0x00;
 157         radio->buffer[7] = extra || reply ? 8 : 0;
 158
 159         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 160                 radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
 161
 162         if (retval < 0 || size != BUFFER_LENGTH) {
 163                 if (video_is_registered(&radio->vdev))
 164                         amradio_dev_warn(&radio->vdev.dev,
 165                                         "cmd %02x failed\n", cmd);
 166                 return retval ? retval : -EIO;
 167         }
 168         if (!extra && !reply)
 169                 return 0;
 170
 171         if (extra) {
 172                 memcpy(radio->buffer, extra, extralen);
 173                 memset(radio->buffer + extralen, 0, 8 - extralen);
 174                 retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 175                         radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
 176         } else {
 177                 memset(radio->buffer, 0, 8);
 178                 retval = usb_bulk_msg(radio->usbdev, usb_rcvbulkpipe(radio->usbdev, 0x81),
 179                         radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
 180         }
 181         if (retval == 0 && size == BUFFER_LENGTH)
 182                 return 0;
 183         if (video_is_registered(&radio->vdev) && cmd != AMRADIO_GET_READY_FLAG)
 184                 amradio_dev_warn(&radio->vdev.dev, "follow-up to cmd %02x failed\n", cmd);
 185         return retval ? retval : -EIO;
 186 }
 187
 188 /* switch on/off the radio. Send 8 bytes to device */
 189 static int amradio_set_mute(struct amradio_device *radio, bool mute)
 190 {
 191         int ret = amradio_send_cmd(radio,
 192                         AMRADIO_SET_MUTE, mute, NULL, 0, false);
 193
 194         if (!ret)
 195                 radio->muted = mute;
 196         return ret;
 197 }
 198
 199 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 200 static int amradio_set_freq(struct amradio_device *radio, int freq)
 201 {
 202         unsigned short freq_send;
 203         u8 buf[3];
 204         int retval;
 205
 206         /* we need to be sure that frequency isn't out of range */
 207         freq = clamp_t(unsigned, freq, FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL);
 208         freq_send = 0x10 + (freq >> 3) / 25;
 209
 210         /* frequency is calculated from freq_send and placed in first 2 bytes */
 211         buf[0] = (freq_send >> 8) & 0xff;
 212         buf[1] = freq_send & 0xff;
 213         buf[2] = 0x01;
 214
 215         retval = amradio_send_cmd(radio, AMRADIO_SET_FREQ, 0, buf, 3, false);
 216         if (retval)
 217                 return retval;
 218         radio->curfreq = freq;
 219         msleep(40);
 220         return 0;
 221 }
 222
 223 static int amradio_set_stereo(struct amradio_device *radio, bool stereo)
 224 {
 225         int ret = amradio_send_cmd(radio,
 226                         AMRADIO_SET_MONO, !stereo, NULL, 0, false);
 227
 228         if (!ret)
 229                 radio->stereo = stereo;
 230         return ret;
 231 }
 232
 233 static int amradio_get_stat(struct amradio_device *radio, bool *is_stereo, u32 *signal)
 234 {
 235         int ret = amradio_send_cmd(radio,
 236                         AMRADIO_GET_SIGNAL, 0, NULL, 0, true);
 237
 238         if (ret)
 239                 return ret;
 240         *is_stereo = radio->buffer[2] >> 7;
 241         *signal = (radio->buffer[3] & 0xf0) << 8;
 242         return 0;
 243 }
 244
 245 /* Handle unplugging the device.
 246  * We call video_unregister_device in any case.
 247  * The last function called in this procedure is
 248  * usb_amradio_device_release.
 249  */
 250 static void usb_amradio_disconnect(struct usb_interface *intf)
 251 {
 252         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 253
 254         mutex_lock(&radio->lock);
 255         video_unregister_device(&radio->vdev);
 256         amradio_set_mute(radio, true);
 257         usb_set_intfdata(intf, NULL);
 258         v4l2_device_disconnect(&radio->v4l2_dev);
 259         mutex_unlock(&radio->lock);
 260         v4l2_device_put(&radio->v4l2_dev);
 261 }
 262
 263 /* vidioc_querycap - query device capabilities */
 264 static int vidioc_querycap(struct file *file, void *priv,
 265                                         struct v4l2_capability *v)
 266 {
 267         struct amradio_device *radio = video_drvdata(file);
 268
 269         strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
 270         strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
 271         usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
 272         v->device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER |
 273                                         V4L2_CAP_HW_FREQ_SEEK;
 274         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
 275         return 0;
 276 }
 277
 278 /* vidioc_g_tuner - get tuner attributes */
 279 static int vidioc_g_tuner(struct file *file, void *priv,
 280                                 struct v4l2_tuner *v)
 281 {
 282         struct amradio_device *radio = video_drvdata(file);
 283         bool is_stereo = false;
 284         int retval;
 285
 286         if (v->index > 0)
 287                 return -EINVAL;
 288
 289         v->signal = 0;
 290         retval = amradio_get_stat(radio, &is_stereo, &v->signal);
 291         if (retval)
 292                 return retval;
 293
 294         strcpy(v->name, "FM");
 295         v->type = V4L2_TUNER_RADIO;
 296         v->rangelow = FREQ_MIN * FREQ_MUL;
 297         v->rangehigh = FREQ_MAX * FREQ_MUL;
 298         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
 299                 V4L2_TUNER_CAP_HWSEEK_WRAP;
 300         v->rxsubchans = is_stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
 301         v->audmode = radio->stereo ?
 302                 V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
 303         return 0;
 304 }
 305
 306 /* vidioc_s_tuner - set tuner attributes */
 307 static int vidioc_s_tuner(struct file *file, void *priv,
 308                                 const struct v4l2_tuner *v)
 309 {
 310         struct amradio_device *radio = video_drvdata(file);
 311
 312         if (v->index > 0)
 313                 return -EINVAL;
 314
 315         /* mono/stereo selector */
 316         switch (v->audmode) {
 317         case V4L2_TUNER_MODE_MONO:
 318                 return amradio_set_stereo(radio, WANT_MONO);
 319         default:
 320                 return amradio_set_stereo(radio, WANT_STEREO);
 321         }
 322 }
 323
 324 /* vidioc_s_frequency - set tuner radio frequency */
 325 static int vidioc_s_frequency(struct file *file, void *priv,
 326                                 const struct v4l2_frequency *f)
 327 {
 328         struct amradio_device *radio = video_drvdata(file);
 329
 330         if (f->tuner != 0)
 331                 return -EINVAL;
 332         return amradio_set_freq(radio, f->frequency);
 333 }
 334
 335 /* vidioc_g_frequency - get tuner radio frequency */
 336 static int vidioc_g_frequency(struct file *file, void *priv,
 337                                 struct v4l2_frequency *f)
 338 {
 339         struct amradio_device *radio = video_drvdata(file);
 340
 341         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 342                 return -EINVAL;
 343         f->type = V4L2_TUNER_RADIO;
 344         f->frequency = radio->curfreq;
 345
 346         return 0;
 347 }
 348
 349 static int vidioc_s_hw_freq_seek(struct file *file, void *priv,
 350                 const struct v4l2_hw_freq_seek *seek)
 351 {
 352         static u8 buf[8] = {
 353                 0x3d, 0x32, 0x0f, 0x08, 0x3d, 0x32, 0x0f, 0x08
 354         };
 355         struct amradio_device *radio = video_drvdata(file);
 356         unsigned long timeout;
 357         int retval;
 358
 359         if (seek->tuner != 0 || !seek->wrap_around)
 360                 return -EINVAL;
 361
 362         if (file->f_flags & O_NONBLOCK)
 363                 return -EWOULDBLOCK;
 364
 365         retval = amradio_send_cmd(radio,
 366                         AMRADIO_SET_SEARCH_LVL, 0, buf, 8, false);
 367         if (retval)
 368                 return retval;
 369         amradio_set_freq(radio, radio->curfreq);
 370         retval = amradio_send_cmd(radio,
 371                 seek->seek_upward ? AMRADIO_SET_SEARCH_UP : AMRADIO_SET_SEARCH_DOWN,
 372                 0, NULL, 0, false);
 373         if (retval)
 374                 return retval;
 375         timeout = jiffies + msecs_to_jiffies(30000);
 376         for (;;) {
 377                 if (time_after(jiffies, timeout)) {
 378                         retval = -ENODATA;
 379                         break;
 380                 }
 381                 if (schedule_timeout_interruptible(msecs_to_jiffies(10))) {
 382                         retval = -ERESTARTSYS;
 383                         break;
 384                 }
 385                 retval = amradio_send_cmd(radio, AMRADIO_GET_READY_FLAG,
 386                                 0, NULL, 0, true);
 387                 if (retval)
 388                         continue;
 389                 amradio_send_cmd(radio, AMRADIO_GET_FREQ, 0, NULL, 0, true);
 390                 if (radio->buffer[1] || radio->buffer[2]) {
 391                         /* To check: sometimes radio->curfreq is set to out of range value */
 392                         radio->curfreq = (radio->buffer[1] << 8) | radio->buffer[2];
 393                         radio->curfreq = (radio->curfreq - 0x10) * 200;
 394                         amradio_send_cmd(radio, AMRADIO_STOP_SEARCH,
 395                                         0, NULL, 0, false);
 396                         amradio_set_freq(radio, radio->curfreq);
 397                         retval = 0;
 398                         break;
 399                 }
 400         }
 401         amradio_send_cmd(radio, AMRADIO_STOP_SEARCH, 0, NULL, 0, false);
 402         amradio_set_freq(radio, radio->curfreq);
 403         return retval;
 404 }
 405
 406 static int usb_amradio_s_ctrl(struct v4l2_ctrl *ctrl)
 407 {
 408         struct amradio_device *radio =
 409                 container_of(ctrl->handler, struct amradio_device, hdl);
 410
 411         switch (ctrl->id) {
 412         case V4L2_CID_AUDIO_MUTE:
 413                 return amradio_set_mute(radio, ctrl->val);
 414         }
 415
 416         return -EINVAL;
 417 }
 418
 419 static int usb_amradio_init(struct amradio_device *radio)
 420 {
 421         int retval;
 422
 423         retval = amradio_set_mute(radio, true);
 424         if (retval)
 425                 goto out_err;
 426         retval = amradio_set_stereo(radio, true);
 427         if (retval)
 428                 goto out_err;
 429         retval = amradio_set_freq(radio, radio->curfreq);
 430         if (retval)
 431                 goto out_err;
 432         return 0;
 433
 434 out_err:
 435         amradio_dev_err(&radio->vdev.dev, "initialization failed\n");
 436         return retval;
 437 }
 438
 439 /* Suspend device - stop device. Need to be checked and fixed */
 440 static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
 441 {
 442         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 443
 444         mutex_lock(&radio->lock);
 445         if (!radio->muted) {
 446                 amradio_set_mute(radio, true);
 447                 radio->muted = false;
 448         }
 449         mutex_unlock(&radio->lock);
 450
 451         dev_info(&intf->dev, "going into suspend..\n");
 452         return 0;
 453 }
 454
 455 /* Resume device - start device. Need to be checked and fixed */
 456 static int usb_amradio_resume(struct usb_interface *intf)
 457 {
 458         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 459
 460         mutex_lock(&radio->lock);
 461         amradio_set_stereo(radio, radio->stereo);
 462         amradio_set_freq(radio, radio->curfreq);
 463
 464         if (!radio->muted)
 465                 amradio_set_mute(radio, false);
 466
 467         mutex_unlock(&radio->lock);
 468
 469         dev_info(&intf->dev, "coming out of suspend..\n");
 470         return 0;
 471 }
 472
 473 static const struct v4l2_ctrl_ops usb_amradio_ctrl_ops = {
 474         .s_ctrl = usb_amradio_s_ctrl,
 475 };
 476
 477 /* File system interface */
 478 static const struct v4l2_file_operations usb_amradio_fops = {
 479         .owner          = THIS_MODULE,
 480         .open           = v4l2_fh_open,
 481         .release        = v4l2_fh_release,
 482         .poll           = v4l2_ctrl_poll,
 483         .unlocked_ioctl = video_ioctl2,
 484 };
 485
 486 static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = {
 487         .vidioc_querycap    = vidioc_querycap,
 488         .vidioc_g_tuner     = vidioc_g_tuner,
 489         .vidioc_s_tuner     = vidioc_s_tuner,
 490         .vidioc_g_frequency = vidioc_g_frequency,
 491         .vidioc_s_frequency = vidioc_s_frequency,
 492         .vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
 493         .vidioc_log_status  = v4l2_ctrl_log_status,
 494         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 495         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 496 };
 497
 498 static void usb_amradio_release(struct v4l2_device *v4l2_dev)
 499 {
 500         struct amradio_device *radio = to_amradio_dev(v4l2_dev);
 501
 502         /* free rest memory */
 503         v4l2_ctrl_handler_free(&radio->hdl);
 504         v4l2_device_unregister(&radio->v4l2_dev);
 505         kfree(radio->buffer);
 506         kfree(radio);
 507 }
 508
 509 /* check if the device is present and register with v4l and usb if it is */
 510 static int usb_amradio_probe(struct usb_interface *intf,
 511                                 const struct usb_device_id *id)
 512 {
 513         struct amradio_device *radio;
 514         int retval = 0;
 515
 516         radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL);
 517
 518         if (!radio) {
 519                 dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
 520                 retval = -ENOMEM;
 521                 goto err;
 522         }
 523
 524         radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
 525
 526         if (!radio->buffer) {
 527                 dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
 528                 retval = -ENOMEM;
 529                 goto err_nobuf;
 530         }
 531
 532         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
 533         if (retval < 0) {
 534                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
 535                 goto err_v4l2;
 536         }
 537
 538         v4l2_ctrl_handler_init(&radio->hdl, 1);
 539         v4l2_ctrl_new_std(&radio->hdl, &usb_amradio_ctrl_ops,
 540                           V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 541         if (radio->hdl.error) {
 542                 retval = radio->hdl.error;
 543                 dev_err(&intf->dev, "couldn't register control\n");
 544                 goto err_ctrl;
 545         }
 546         mutex_init(&radio->lock);
 547
 548         radio->v4l2_dev.ctrl_handler = &radio->hdl;
 549         radio->v4l2_dev.release = usb_amradio_release;
 550         strlcpy(radio->vdev.name, radio->v4l2_dev.name,
 551                 sizeof(radio->vdev.name));
 552         radio->vdev.v4l2_dev = &radio->v4l2_dev;
 553         radio->vdev.fops = &usb_amradio_fops;
 554         radio->vdev.ioctl_ops = &usb_amradio_ioctl_ops;
 555         radio->vdev.release = video_device_release_empty;
 556         radio->vdev.lock = &radio->lock;
 557
 558         radio->usbdev = interface_to_usbdev(intf);
 559         radio->intf = intf;
 560         usb_set_intfdata(intf, &radio->v4l2_dev);
 561         radio->curfreq = 95.16 * FREQ_MUL;
 562
 563         video_set_drvdata(&radio->vdev, radio);
 564         retval = usb_amradio_init(radio);
 565         if (retval)
 566                 goto err_vdev;
 567
 568         retval = video_register_device(&radio->vdev, VFL_TYPE_RADIO,
 569                                         radio_nr);
 570         if (retval < 0) {
 571                 dev_err(&intf->dev, "could not register video device\n");
 572                 goto err_vdev;
 573         }
 574
 575         return 0;
 576
 577 err_vdev:
 578         v4l2_ctrl_handler_free(&radio->hdl);
 579 err_ctrl:
 580         v4l2_device_unregister(&radio->v4l2_dev);
 581 err_v4l2:
 582         kfree(radio->buffer);
 583 err_nobuf:
 584         kfree(radio);
 585 err:
 586         return retval;
 587 }
 588
 589 /* USB Device ID List */
 590 static const struct usb_device_id usb_amradio_device_table[] = {
 591         { USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
 592                                                         USB_CLASS_HID, 0, 0) },
 593         { }                                             /* Terminating entry */
 594 };
 595
 596 MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);
 597
 598 /* USB subsystem interface */
 599 static struct usb_driver usb_amradio_driver = {
 600         .name                   = MR800_DRIVER_NAME,
 601         .probe                  = usb_amradio_probe,
 602         .disconnect             = usb_amradio_disconnect,
 603         .suspend                = usb_amradio_suspend,
 604         .resume                 = usb_amradio_resume,
 605         .reset_resume           = usb_amradio_resume,
 606         .id_table               = usb_amradio_device_table,
 607 };
 608
 609 module_usb_driver(usb_amradio_driver);