drivers/media/radio/radio-mr800.c

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This source file includes following definitions.
to_amradio_dev
amradio_send_cmd
amradio_set_mute
amradio_set_freq
amradio_set_stereo
amradio_get_stat
usb_amradio_disconnect
vidioc_querycap
vidioc_g_tuner
vidioc_s_tuner
vidioc_s_frequency
vidioc_g_frequency
vidioc_s_hw_freq_seek
usb_amradio_s_ctrl
usb_amradio_init
usb_amradio_suspend
usb_amradio_resume
usb_amradio_release
usb_amradio_probe
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * A driver for the AverMedia MR 800 USB FM radio. This device plugs
   4  * into both the USB and an analog audio input, so this thing
   5  * only deals with initialization and frequency setting, the
   6  * audio data has to be handled by a sound driver.
   7  *
   8  * Copyright (c) 2008 Alexey Klimov <klimov.linux@gmail.com>
   9  */
  10 
  11 /*
  12  * Big thanks to authors and contributors of dsbr100.c and radio-si470x.c
  13  *
  14  * When work was looked pretty good, i discover this:
  15  * http://av-usbradio.sourceforge.net/index.php
  16  * http://sourceforge.net/projects/av-usbradio/
  17  * Latest release of theirs project was in 2005.
  18  * Probably, this driver could be improved through using their
  19  * achievements (specifications given).
  20  * Also, Faidon Liambotis <paravoid@debian.org> wrote nice driver for this radio
  21  * in 2007. He allowed to use his driver to improve current mr800 radio driver.
  22  * http://www.spinics.net/lists/linux-usb-devel/msg10109.html
  23  *
  24  * Version 0.01:        First working version.
  25  *                      It's required to blacklist AverMedia USB Radio
  26  *                      in usbhid/hid-quirks.c
  27  * Version 0.10:        A lot of cleanups and fixes: unpluging the device,
  28  *                      few mutex locks were added, codinstyle issues, etc.
  29  *                      Added stereo support. Thanks to
  30  *                      Douglas Schilling Landgraf <dougsland@gmail.com> and
  31  *                      David Ellingsworth <david@identd.dyndns.org>
  32  *                      for discussion, help and support.
  33  * Version 0.11:        Converted to v4l2_device.
  34  *
  35  * Many things to do:
  36  *      - Correct power management of device (suspend & resume)
  37  *      - Add code for scanning and smooth tuning
  38  *      - Add code for sensitivity value
  39  *      - Correct mistakes
  40  *      - In Japan another FREQ_MIN and FREQ_MAX
  41  */
  42 
  43 /* kernel includes */
  44 #include <linux/kernel.h>
  45 #include <linux/module.h>
  46 #include <linux/init.h>
  47 #include <linux/slab.h>
  48 #include <linux/input.h>
  49 #include <linux/videodev2.h>
  50 #include <media/v4l2-device.h>
  51 #include <media/v4l2-ioctl.h>
  52 #include <media/v4l2-ctrls.h>
  53 #include <media/v4l2-event.h>
  54 #include <linux/usb.h>
  55 #include <linux/mutex.h>
  56 
  57 /* driver and module definitions */
  58 #define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>"
  59 #define DRIVER_DESC "AverMedia MR 800 USB FM radio driver"
  60 #define DRIVER_VERSION "0.1.2"
  61 
  62 MODULE_AUTHOR(DRIVER_AUTHOR);
  63 MODULE_DESCRIPTION(DRIVER_DESC);
  64 MODULE_LICENSE("GPL");
  65 MODULE_VERSION(DRIVER_VERSION);
  66 
  67 #define USB_AMRADIO_VENDOR 0x07ca
  68 #define USB_AMRADIO_PRODUCT 0xb800
  69 
  70 /* dev_warn macro with driver name */
  71 #define MR800_DRIVER_NAME "radio-mr800"
  72 #define amradio_dev_warn(dev, fmt, arg...)                              \
  73                 dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
  74 
  75 #define amradio_dev_err(dev, fmt, arg...) \
  76                 dev_err(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
  77 
  78 /* Probably USB_TIMEOUT should be modified in module parameter */
  79 #define BUFFER_LENGTH 8
  80 #define USB_TIMEOUT 500
  81 
  82 /* Frequency limits in MHz -- these are European values.  For Japanese
  83 devices, that would be 76 and 91.  */
  84 #define FREQ_MIN  87.5
  85 #define FREQ_MAX 108.0
  86 #define FREQ_MUL 16000
  87 
  88 /*
  89  * Commands that device should understand
  90  * List isn't full and will be updated with implementation of new functions
  91  */
  92 #define AMRADIO_SET_FREQ        0xa4
  93 #define AMRADIO_GET_READY_FLAG  0xa5
  94 #define AMRADIO_GET_SIGNAL      0xa7
  95 #define AMRADIO_GET_FREQ        0xa8
  96 #define AMRADIO_SET_SEARCH_UP   0xa9
  97 #define AMRADIO_SET_SEARCH_DOWN 0xaa
  98 #define AMRADIO_SET_MUTE        0xab
  99 #define AMRADIO_SET_RIGHT_MUTE  0xac
 100 #define AMRADIO_SET_LEFT_MUTE   0xad
 101 #define AMRADIO_SET_MONO        0xae
 102 #define AMRADIO_SET_SEARCH_LVL  0xb0
 103 #define AMRADIO_STOP_SEARCH     0xb1
 104 
 105 /* Comfortable defines for amradio_set_stereo */
 106 #define WANT_STEREO             0x00
 107 #define WANT_MONO               0x01
 108 
 109 /* module parameter */
 110 static int radio_nr = -1;
 111 module_param(radio_nr, int, 0);
 112 MODULE_PARM_DESC(radio_nr, "Radio Nr");
 113 
 114 /* Data for one (physical) device */
 115 struct amradio_device {
 116         /* reference to USB and video device */
 117         struct usb_device *usbdev;
 118         struct usb_interface *intf;
 119         struct video_device vdev;
 120         struct v4l2_device v4l2_dev;
 121         struct v4l2_ctrl_handler hdl;
 122 
 123         u8 *buffer;
 124         struct mutex lock;      /* buffer locking */
 125         int curfreq;
 126         int stereo;
 127         int muted;
 128 };
 129 
 130 static inline struct amradio_device *to_amradio_dev(struct v4l2_device *v4l2_dev)
 131 {
 132         return container_of(v4l2_dev, struct amradio_device, v4l2_dev);
 133 }
 134 
 135 static int amradio_send_cmd(struct amradio_device *radio, u8 cmd, u8 arg,
 136                 u8 *extra, u8 extralen, bool reply)
 137 {
 138         int retval;
 139         int size;
 140 
 141         radio->buffer[0] = 0x00;
 142         radio->buffer[1] = 0x55;
 143         radio->buffer[2] = 0xaa;
 144         radio->buffer[3] = extralen;
 145         radio->buffer[4] = cmd;
 146         radio->buffer[5] = arg;
 147         radio->buffer[6] = 0x00;
 148         radio->buffer[7] = extra || reply ? 8 : 0;
 149 
 150         retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 151                 radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
 152 
 153         if (retval < 0 || size != BUFFER_LENGTH) {
 154                 if (video_is_registered(&radio->vdev))
 155                         amradio_dev_warn(&radio->vdev.dev,
 156                                         "cmd %02x failed\n", cmd);
 157                 return retval ? retval : -EIO;
 158         }
 159         if (!extra && !reply)
 160                 return 0;
 161 
 162         if (extra) {
 163                 memcpy(radio->buffer, extra, extralen);
 164                 memset(radio->buffer + extralen, 0, 8 - extralen);
 165                 retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
 166                         radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
 167         } else {
 168                 memset(radio->buffer, 0, 8);
 169                 retval = usb_bulk_msg(radio->usbdev, usb_rcvbulkpipe(radio->usbdev, 0x81),
 170                         radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
 171         }
 172         if (retval == 0 && size == BUFFER_LENGTH)
 173                 return 0;
 174         if (video_is_registered(&radio->vdev) && cmd != AMRADIO_GET_READY_FLAG)
 175                 amradio_dev_warn(&radio->vdev.dev, "follow-up to cmd %02x failed\n", cmd);
 176         return retval ? retval : -EIO;
 177 }
 178 
 179 /* switch on/off the radio. Send 8 bytes to device */
 180 static int amradio_set_mute(struct amradio_device *radio, bool mute)
 181 {
 182         int ret = amradio_send_cmd(radio,
 183                         AMRADIO_SET_MUTE, mute, NULL, 0, false);
 184 
 185         if (!ret)
 186                 radio->muted = mute;
 187         return ret;
 188 }
 189 
 190 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 191 static int amradio_set_freq(struct amradio_device *radio, int freq)
 192 {
 193         unsigned short freq_send;
 194         u8 buf[3];
 195         int retval;
 196 
 197         /* we need to be sure that frequency isn't out of range */
 198         freq = clamp_t(unsigned, freq, FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL);
 199         freq_send = 0x10 + (freq >> 3) / 25;
 200 
 201         /* frequency is calculated from freq_send and placed in first 2 bytes */
 202         buf[0] = (freq_send >> 8) & 0xff;
 203         buf[1] = freq_send & 0xff;
 204         buf[2] = 0x01;
 205 
 206         retval = amradio_send_cmd(radio, AMRADIO_SET_FREQ, 0, buf, 3, false);
 207         if (retval)
 208                 return retval;
 209         radio->curfreq = freq;
 210         msleep(40);
 211         return 0;
 212 }
 213 
 214 static int amradio_set_stereo(struct amradio_device *radio, bool stereo)
 215 {
 216         int ret = amradio_send_cmd(radio,
 217                         AMRADIO_SET_MONO, !stereo, NULL, 0, false);
 218 
 219         if (!ret)
 220                 radio->stereo = stereo;
 221         return ret;
 222 }
 223 
 224 static int amradio_get_stat(struct amradio_device *radio, bool *is_stereo, u32 *signal)
 225 {
 226         int ret = amradio_send_cmd(radio,
 227                         AMRADIO_GET_SIGNAL, 0, NULL, 0, true);
 228 
 229         if (ret)
 230                 return ret;
 231         *is_stereo = radio->buffer[2] >> 7;
 232         *signal = (radio->buffer[3] & 0xf0) << 8;
 233         return 0;
 234 }
 235 
 236 /* Handle unplugging the device.
 237  * We call video_unregister_device in any case.
 238  * The last function called in this procedure is
 239  * usb_amradio_device_release.
 240  */
 241 static void usb_amradio_disconnect(struct usb_interface *intf)
 242 {
 243         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 244 
 245         mutex_lock(&radio->lock);
 246         video_unregister_device(&radio->vdev);
 247         amradio_set_mute(radio, true);
 248         usb_set_intfdata(intf, NULL);
 249         v4l2_device_disconnect(&radio->v4l2_dev);
 250         mutex_unlock(&radio->lock);
 251         v4l2_device_put(&radio->v4l2_dev);
 252 }
 253 
 254 /* vidioc_querycap - query device capabilities */
 255 static int vidioc_querycap(struct file *file, void *priv,
 256                                         struct v4l2_capability *v)
 257 {
 258         struct amradio_device *radio = video_drvdata(file);
 259 
 260         strscpy(v->driver, "radio-mr800", sizeof(v->driver));
 261         strscpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
 262         usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
 263         return 0;
 264 }
 265 
 266 /* vidioc_g_tuner - get tuner attributes */
 267 static int vidioc_g_tuner(struct file *file, void *priv,
 268                                 struct v4l2_tuner *v)
 269 {
 270         struct amradio_device *radio = video_drvdata(file);
 271         bool is_stereo = false;
 272         int retval;
 273 
 274         if (v->index > 0)
 275                 return -EINVAL;
 276 
 277         v->signal = 0;
 278         retval = amradio_get_stat(radio, &is_stereo, &v->signal);
 279         if (retval)
 280                 return retval;
 281 
 282         strscpy(v->name, "FM", sizeof(v->name));
 283         v->type = V4L2_TUNER_RADIO;
 284         v->rangelow = FREQ_MIN * FREQ_MUL;
 285         v->rangehigh = FREQ_MAX * FREQ_MUL;
 286         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
 287                 V4L2_TUNER_CAP_HWSEEK_WRAP;
 288         v->rxsubchans = is_stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
 289         v->audmode = radio->stereo ?
 290                 V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
 291         return 0;
 292 }
 293 
 294 /* vidioc_s_tuner - set tuner attributes */
 295 static int vidioc_s_tuner(struct file *file, void *priv,
 296                                 const struct v4l2_tuner *v)
 297 {
 298         struct amradio_device *radio = video_drvdata(file);
 299 
 300         if (v->index > 0)
 301                 return -EINVAL;
 302 
 303         /* mono/stereo selector */
 304         switch (v->audmode) {
 305         case V4L2_TUNER_MODE_MONO:
 306                 return amradio_set_stereo(radio, WANT_MONO);
 307         default:
 308                 return amradio_set_stereo(radio, WANT_STEREO);
 309         }
 310 }
 311 
 312 /* vidioc_s_frequency - set tuner radio frequency */
 313 static int vidioc_s_frequency(struct file *file, void *priv,
 314                                 const struct v4l2_frequency *f)
 315 {
 316         struct amradio_device *radio = video_drvdata(file);
 317 
 318         if (f->tuner != 0)
 319                 return -EINVAL;
 320         return amradio_set_freq(radio, f->frequency);
 321 }
 322 
 323 /* vidioc_g_frequency - get tuner radio frequency */
 324 static int vidioc_g_frequency(struct file *file, void *priv,
 325                                 struct v4l2_frequency *f)
 326 {
 327         struct amradio_device *radio = video_drvdata(file);
 328 
 329         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 330                 return -EINVAL;
 331         f->type = V4L2_TUNER_RADIO;
 332         f->frequency = radio->curfreq;
 333 
 334         return 0;
 335 }
 336 
 337 static int vidioc_s_hw_freq_seek(struct file *file, void *priv,
 338                 const struct v4l2_hw_freq_seek *seek)
 339 {
 340         static u8 buf[8] = {
 341                 0x3d, 0x32, 0x0f, 0x08, 0x3d, 0x32, 0x0f, 0x08
 342         };
 343         struct amradio_device *radio = video_drvdata(file);
 344         unsigned long timeout;
 345         int retval;
 346 
 347         if (seek->tuner != 0 || !seek->wrap_around)
 348                 return -EINVAL;
 349 
 350         if (file->f_flags & O_NONBLOCK)
 351                 return -EWOULDBLOCK;
 352 
 353         retval = amradio_send_cmd(radio,
 354                         AMRADIO_SET_SEARCH_LVL, 0, buf, 8, false);
 355         if (retval)
 356                 return retval;
 357         amradio_set_freq(radio, radio->curfreq);
 358         retval = amradio_send_cmd(radio,
 359                 seek->seek_upward ? AMRADIO_SET_SEARCH_UP : AMRADIO_SET_SEARCH_DOWN,
 360                 0, NULL, 0, false);
 361         if (retval)
 362                 return retval;
 363         timeout = jiffies + msecs_to_jiffies(30000);
 364         for (;;) {
 365                 if (time_after(jiffies, timeout)) {
 366                         retval = -ENODATA;
 367                         break;
 368                 }
 369                 if (schedule_timeout_interruptible(msecs_to_jiffies(10))) {
 370                         retval = -ERESTARTSYS;
 371                         break;
 372                 }
 373                 retval = amradio_send_cmd(radio, AMRADIO_GET_READY_FLAG,
 374                                 0, NULL, 0, true);
 375                 if (retval)
 376                         continue;
 377                 amradio_send_cmd(radio, AMRADIO_GET_FREQ, 0, NULL, 0, true);
 378                 if (radio->buffer[1] || radio->buffer[2]) {
 379                         /* To check: sometimes radio->curfreq is set to out of range value */
 380                         radio->curfreq = (radio->buffer[1] << 8) | radio->buffer[2];
 381                         radio->curfreq = (radio->curfreq - 0x10) * 200;
 382                         amradio_send_cmd(radio, AMRADIO_STOP_SEARCH,
 383                                         0, NULL, 0, false);
 384                         amradio_set_freq(radio, radio->curfreq);
 385                         retval = 0;
 386                         break;
 387                 }
 388         }
 389         amradio_send_cmd(radio, AMRADIO_STOP_SEARCH, 0, NULL, 0, false);
 390         amradio_set_freq(radio, radio->curfreq);
 391         return retval;
 392 }
 393 
 394 static int usb_amradio_s_ctrl(struct v4l2_ctrl *ctrl)
 395 {
 396         struct amradio_device *radio =
 397                 container_of(ctrl->handler, struct amradio_device, hdl);
 398 
 399         switch (ctrl->id) {
 400         case V4L2_CID_AUDIO_MUTE:
 401                 return amradio_set_mute(radio, ctrl->val);
 402         }
 403 
 404         return -EINVAL;
 405 }
 406 
 407 static int usb_amradio_init(struct amradio_device *radio)
 408 {
 409         int retval;
 410 
 411         retval = amradio_set_mute(radio, true);
 412         if (retval)
 413                 goto out_err;
 414         retval = amradio_set_stereo(radio, true);
 415         if (retval)
 416                 goto out_err;
 417         retval = amradio_set_freq(radio, radio->curfreq);
 418         if (retval)
 419                 goto out_err;
 420         return 0;
 421 
 422 out_err:
 423         amradio_dev_err(&radio->vdev.dev, "initialization failed\n");
 424         return retval;
 425 }
 426 
 427 /* Suspend device - stop device. Need to be checked and fixed */
 428 static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
 429 {
 430         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 431 
 432         mutex_lock(&radio->lock);
 433         if (!radio->muted) {
 434                 amradio_set_mute(radio, true);
 435                 radio->muted = false;
 436         }
 437         mutex_unlock(&radio->lock);
 438 
 439         dev_info(&intf->dev, "going into suspend..\n");
 440         return 0;
 441 }
 442 
 443 /* Resume device - start device. Need to be checked and fixed */
 444 static int usb_amradio_resume(struct usb_interface *intf)
 445 {
 446         struct amradio_device *radio = to_amradio_dev(usb_get_intfdata(intf));
 447 
 448         mutex_lock(&radio->lock);
 449         amradio_set_stereo(radio, radio->stereo);
 450         amradio_set_freq(radio, radio->curfreq);
 451 
 452         if (!radio->muted)
 453                 amradio_set_mute(radio, false);
 454 
 455         mutex_unlock(&radio->lock);
 456 
 457         dev_info(&intf->dev, "coming out of suspend..\n");
 458         return 0;
 459 }
 460 
 461 static const struct v4l2_ctrl_ops usb_amradio_ctrl_ops = {
 462         .s_ctrl = usb_amradio_s_ctrl,
 463 };
 464 
 465 /* File system interface */
 466 static const struct v4l2_file_operations usb_amradio_fops = {
 467         .owner          = THIS_MODULE,
 468         .open           = v4l2_fh_open,
 469         .release        = v4l2_fh_release,
 470         .poll           = v4l2_ctrl_poll,
 471         .unlocked_ioctl = video_ioctl2,
 472 };
 473 
 474 static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = {
 475         .vidioc_querycap    = vidioc_querycap,
 476         .vidioc_g_tuner     = vidioc_g_tuner,
 477         .vidioc_s_tuner     = vidioc_s_tuner,
 478         .vidioc_g_frequency = vidioc_g_frequency,
 479         .vidioc_s_frequency = vidioc_s_frequency,
 480         .vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
 481         .vidioc_log_status  = v4l2_ctrl_log_status,
 482         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 483         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 484 };
 485 
 486 static void usb_amradio_release(struct v4l2_device *v4l2_dev)
 487 {
 488         struct amradio_device *radio = to_amradio_dev(v4l2_dev);
 489 
 490         /* free rest memory */
 491         v4l2_ctrl_handler_free(&radio->hdl);
 492         v4l2_device_unregister(&radio->v4l2_dev);
 493         kfree(radio->buffer);
 494         kfree(radio);
 495 }
 496 
 497 /* check if the device is present and register with v4l and usb if it is */
 498 static int usb_amradio_probe(struct usb_interface *intf,
 499                                 const struct usb_device_id *id)
 500 {
 501         struct amradio_device *radio;
 502         int retval;
 503 
 504         radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL);
 505 
 506         if (!radio) {
 507                 dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
 508                 retval = -ENOMEM;
 509                 goto err;
 510         }
 511 
 512         radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
 513 
 514         if (!radio->buffer) {
 515                 dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
 516                 retval = -ENOMEM;
 517                 goto err_nobuf;
 518         }
 519 
 520         retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
 521         if (retval < 0) {
 522                 dev_err(&intf->dev, "couldn't register v4l2_device\n");
 523                 goto err_v4l2;
 524         }
 525 
 526         v4l2_ctrl_handler_init(&radio->hdl, 1);
 527         v4l2_ctrl_new_std(&radio->hdl, &usb_amradio_ctrl_ops,
 528                           V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 529         if (radio->hdl.error) {
 530                 retval = radio->hdl.error;
 531                 dev_err(&intf->dev, "couldn't register control\n");
 532                 goto err_ctrl;
 533         }
 534         mutex_init(&radio->lock);
 535 
 536         radio->v4l2_dev.ctrl_handler = &radio->hdl;
 537         radio->v4l2_dev.release = usb_amradio_release;
 538         strscpy(radio->vdev.name, radio->v4l2_dev.name,
 539                 sizeof(radio->vdev.name));
 540         radio->vdev.v4l2_dev = &radio->v4l2_dev;
 541         radio->vdev.fops = &usb_amradio_fops;
 542         radio->vdev.ioctl_ops = &usb_amradio_ioctl_ops;
 543         radio->vdev.release = video_device_release_empty;
 544         radio->vdev.lock = &radio->lock;
 545         radio->vdev.device_caps = V4L2_CAP_RADIO | V4L2_CAP_TUNER |
 546                                   V4L2_CAP_HW_FREQ_SEEK;
 547 
 548         radio->usbdev = interface_to_usbdev(intf);
 549         radio->intf = intf;
 550         usb_set_intfdata(intf, &radio->v4l2_dev);
 551         radio->curfreq = 95.16 * FREQ_MUL;
 552 
 553         video_set_drvdata(&radio->vdev, radio);
 554         retval = usb_amradio_init(radio);
 555         if (retval)
 556                 goto err_vdev;
 557 
 558         retval = video_register_device(&radio->vdev, VFL_TYPE_RADIO,
 559                                         radio_nr);
 560         if (retval < 0) {
 561                 dev_err(&intf->dev, "could not register video device\n");
 562                 goto err_vdev;
 563         }
 564 
 565         return 0;
 566 
 567 err_vdev:
 568         v4l2_ctrl_handler_free(&radio->hdl);
 569 err_ctrl:
 570         v4l2_device_unregister(&radio->v4l2_dev);
 571 err_v4l2:
 572         kfree(radio->buffer);
 573 err_nobuf:
 574         kfree(radio);
 575 err:
 576         return retval;
 577 }
 578 
 579 /* USB Device ID List */
 580 static const struct usb_device_id usb_amradio_device_table[] = {
 581         { USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
 582                                                         USB_CLASS_HID, 0, 0) },
 583         { }                                             /* Terminating entry */
 584 };
 585 
 586 MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);
 587 
 588 /* USB subsystem interface */
 589 static struct usb_driver usb_amradio_driver = {
 590         .name                   = MR800_DRIVER_NAME,
 591         .probe                  = usb_amradio_probe,
 592         .disconnect             = usb_amradio_disconnect,
 593         .suspend                = usb_amradio_suspend,
 594         .resume                 = usb_amradio_resume,
 595         .reset_resume           = usb_amradio_resume,
 596         .id_table               = usb_amradio_device_table,
 597 };
 598 
 599 module_usb_driver(usb_amradio_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/radio/radio-mr800.c

DEFINITIONS
