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 trough 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 video_device videodev; 136 struct v4l2_device v4l2_dev; 137 138 unsigned char *buffer; 139 struct mutex lock; /* buffer locking */ 140 int curfreq; 141 int stereo; 142 int muted; 143 int initialized; 144 }; 145 146 #define vdev_to_amradio(r) container_of(r, struct amradio_device, videodev) 147 148 /* USB Device ID List */ 149 static struct usb_device_id usb_amradio_device_table[] = { 150 {USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT, 151 USB_CLASS_HID, 0, 0) }, 152 { } /* Terminating entry */ 153 }; 154 155 MODULE_DEVICE_TABLE(usb, usb_amradio_device_table); 156 157 /* USB subsystem interface */ 158 static struct usb_driver usb_amradio_driver = { 159 .name = MR800_DRIVER_NAME, 160 .probe = usb_amradio_probe, 161 .disconnect = usb_amradio_disconnect, 162 .suspend = usb_amradio_suspend, 163 .resume = usb_amradio_resume, 164 .reset_resume = usb_amradio_resume, 165 .id_table = usb_amradio_device_table, 166 .supports_autosuspend = 0, 167 }; 168 169 /* switch on/off the radio. Send 8 bytes to device */ 170 static int amradio_set_mute(struct amradio_device *radio, char argument) 171 { 172 int retval; 173 int size; 174 175 BUG_ON(!mutex_is_locked(&radio->lock)); 176 177 radio->buffer[0] = 0x00; 178 radio->buffer[1] = 0x55; 179 radio->buffer[2] = 0xaa; 180 radio->buffer[3] = 0x00; 181 radio->buffer[4] = AMRADIO_SET_MUTE; 182 radio->buffer[5] = argument; 183 radio->buffer[6] = 0x00; 184 radio->buffer[7] = 0x00; 185 186 retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), 187 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); 188 189 if (retval < 0 || size != BUFFER_LENGTH) { 190 amradio_dev_warn(&radio->videodev.dev, "set mute failed\n"); 191 return retval; 192 } 193 194 radio->muted = argument; 195 196 return retval; 197 } 198 199 /* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */ 200 static int amradio_setfreq(struct amradio_device *radio, int freq) 201 { 202 int retval; 203 int size; 204 unsigned short freq_send = 0x10 + (freq >> 3) / 25; 205 206 BUG_ON(!mutex_is_locked(&radio->lock)); 207 208 radio->buffer[0] = 0x00; 209 radio->buffer[1] = 0x55; 210 radio->buffer[2] = 0xaa; 211 radio->buffer[3] = 0x03; 212 radio->buffer[4] = AMRADIO_SET_FREQ; 213 radio->buffer[5] = 0x00; 214 radio->buffer[6] = 0x00; 215 radio->buffer[7] = 0x08; 216 217 retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), 218 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); 219 220 if (retval < 0 || size != BUFFER_LENGTH) 221 goto out_err; 222 223 /* frequency is calculated from freq_send and placed in first 2 bytes */ 224 radio->buffer[0] = (freq_send >> 8) & 0xff; 225 radio->buffer[1] = freq_send & 0xff; 226 radio->buffer[2] = 0x01; 227 radio->buffer[3] = 0x00; 228 radio->buffer[4] = 0x00; 229 /* 5 and 6 bytes of buffer already = 0x00 */ 230 radio->buffer[7] = 0x00; 231 232 retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), 233 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); 234 235 if (retval < 0 || size != BUFFER_LENGTH) 236 goto out_err; 237 238 goto out; 239 240 out_err: 241 amradio_dev_warn(&radio->videodev.dev, "set frequency failed\n"); 242 out: 243 return retval; 244 } 245 246 static int amradio_set_stereo(struct amradio_device *radio, char argument) 247 { 248 int retval; 249 int size; 250 251 BUG_ON(!mutex_is_locked(&radio->lock)); 252 253 radio->buffer[0] = 0x00; 254 radio->buffer[1] = 0x55; 255 radio->buffer[2] = 0xaa; 256 radio->buffer[3] = 0x00; 257 radio->buffer[4] = AMRADIO_SET_MONO; 258 radio->buffer[5] = argument; 259 radio->buffer[6] = 0x00; 260 radio->buffer[7] = 0x00; 261 262 retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2), 263 (void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT); 264 265 if (retval < 0 || size != BUFFER_LENGTH) { 266 amradio_dev_warn(&radio->videodev.dev, "set stereo failed\n"); 267 return retval; 268 } 269 270 if (argument == WANT_STEREO) 271 radio->stereo = 1; 272 else 273 radio->stereo = 0; 274 275 return retval; 276 } 277 278 /* Handle unplugging the device. 279 * We call video_unregister_device in any case. 280 * The last function called in this procedure is 281 * usb_amradio_device_release. 282 */ 283 static void usb_amradio_disconnect(struct usb_interface *intf) 284 { 285 struct amradio_device *radio = usb_get_intfdata(intf); 286 287 mutex_lock(&radio->lock); 288 radio->usbdev = NULL; 289 mutex_unlock(&radio->lock); 290 291 usb_set_intfdata(intf, NULL); 292 v4l2_device_disconnect(&radio->v4l2_dev); 293 video_unregister_device(&radio->videodev); 294 } 295 296 /* vidioc_querycap - query device capabilities */ 297 static int vidioc_querycap(struct file *file, void *priv, 298 struct v4l2_capability *v) 299 { 300 struct amradio_device *radio = file->private_data; 301 302 strlcpy(v->driver, "radio-mr800", sizeof(v->driver)); 303 strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card)); 304 usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info)); 305 v->version = RADIO_VERSION; 306 v->capabilities = V4L2_CAP_TUNER; 307 return 0; 308 } 309 310 /* vidioc_g_tuner - get tuner attributes */ 311 static int vidioc_g_tuner(struct file *file, void *priv, 312 struct v4l2_tuner *v) 313 { 314 struct amradio_device *radio = file->private_data; 315 int retval; 316 317 if (v->index > 0) 318 return -EINVAL; 319 320 /* TODO: Add function which look is signal stereo or not 321 * amradio_getstat(radio); 322 */ 323 324 /* we call amradio_set_stereo to set radio->stereo 325 * Honestly, amradio_getstat should cover this in future and 326 * amradio_set_stereo shouldn't be here 327 */ 328 retval = amradio_set_stereo(radio, WANT_STEREO); 329 330 strcpy(v->name, "FM"); 331 v->type = V4L2_TUNER_RADIO; 332 v->rangelow = FREQ_MIN * FREQ_MUL; 333 v->rangehigh = FREQ_MAX * FREQ_MUL; 334 v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO; 335 v->capability = V4L2_TUNER_CAP_LOW; 336 if (radio->stereo) 337 v->audmode = V4L2_TUNER_MODE_STEREO; 338 else 339 v->audmode = V4L2_TUNER_MODE_MONO; 340 v->signal = 0xffff; /* Can't get the signal strength, sad.. */ 341 v->afc = 0; /* Don't know what is this */ 342 343 return retval; 344 } 345 346 /* vidioc_s_tuner - set tuner attributes */ 347 static int vidioc_s_tuner(struct file *file, void *priv, 348 struct v4l2_tuner *v) 349 { 350 struct amradio_device *radio = file->private_data; 351 int retval = -EINVAL; 352 353 if (v->index > 0) 354 return -EINVAL; 355 356 /* mono/stereo selector */ 357 switch (v->audmode) { 358 case V4L2_TUNER_MODE_MONO: 359 retval = amradio_set_stereo(radio, WANT_MONO); 360 break; 361 case V4L2_TUNER_MODE_STEREO: 362 retval = amradio_set_stereo(radio, WANT_STEREO); 363 break; 364 } 365 366 return retval; 367 } 368 369 /* vidioc_s_frequency - set tuner radio frequency */ 370 static int vidioc_s_frequency(struct file *file, void *priv, 371 struct v4l2_frequency *f) 372 { 373 struct amradio_device *radio = file->private_data; 374 int retval = 0; 375 376 radio->curfreq = f->frequency; 377 378 retval = amradio_setfreq(radio, radio->curfreq); 379 380 return retval; 381 } 382 383 /* vidioc_g_frequency - get tuner radio frequency */ 384 static int vidioc_g_frequency(struct file *file, void *priv, 385 struct v4l2_frequency *f) 386 { 387 struct amradio_device *radio = file->private_data; 388 389 f->type = V4L2_TUNER_RADIO; 390 f->frequency = radio->curfreq; 391 392 return 0; 393 } 394 395 /* vidioc_queryctrl - enumerate control items */ 396 static int vidioc_queryctrl(struct file *file, void *priv, 397 struct v4l2_queryctrl *qc) 398 { 399 switch (qc->id) { 400 case V4L2_CID_AUDIO_MUTE: 401 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); 402 } 403 404 return -EINVAL; 405 } 406 407 /* vidioc_g_ctrl - get the value of a control */ 408 static int vidioc_g_ctrl(struct file *file, void *priv, 409 struct v4l2_control *ctrl) 410 { 411 struct amradio_device *radio = file->private_data; 412 413 switch (ctrl->id) { 414 case V4L2_CID_AUDIO_MUTE: 415 ctrl->value = radio->muted; 416 return 0; 417 } 418 419 return -EINVAL; 420 } 421 422 /* vidioc_s_ctrl - set the value of a control */ 423 static int vidioc_s_ctrl(struct file *file, void *priv, 424 struct v4l2_control *ctrl) 425 { 426 struct amradio_device *radio = file->private_data; 427 int retval = -EINVAL; 428 429 switch (ctrl->id) { 430 case V4L2_CID_AUDIO_MUTE: 431 if (ctrl->value) 432 retval = amradio_set_mute(radio, AMRADIO_STOP); 433 else 434 retval = amradio_set_mute(radio, AMRADIO_START); 435 436 break; 437 } 438 439 return retval; 440 } 441 442 /* vidioc_g_audio - get audio attributes */ 443 static int vidioc_g_audio(struct file *file, void *priv, 444 struct v4l2_audio *a) 445 { 446 if (a->index > 1) 447 return -EINVAL; 448 449 strcpy(a->name, "Radio"); 450 a->capability = V4L2_AUDCAP_STEREO; 451 return 0; 452 } 453 454 /* vidioc_s_audio - set audio attributes */ 455 static int vidioc_s_audio(struct file *file, void *priv, 456 struct v4l2_audio *a) 457 { 458 if (a->index != 0) 459 return -EINVAL; 460 return 0; 461 } 462 463 /* vidioc_g_input - get input */ 464 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 465 { 466 *i = 0; 467 return 0; 468 } 469 470 /* vidioc_s_input - set input */ 471 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 472 { 473 if (i != 0) 474 return -EINVAL; 475 return 0; 476 } 477 478 static int usb_amradio_init(struct amradio_device *radio) 479 { 480 int retval; 481 482 retval = amradio_set_mute(radio, AMRADIO_STOP); 483 if (retval) 484 goto out_err; 485 486 retval = amradio_set_stereo(radio, WANT_STEREO); 487 if (retval) 488 goto out_err; 489 490 radio->initialized = 1; 491 goto out; 492 493 out_err: 494 amradio_dev_err(&radio->videodev.dev, "initialization failed\n"); 495 out: 496 return retval; 497 } 498 499 /* open device - amradio_start() and amradio_setfreq() */ 500 static int usb_amradio_open(struct file *file) 501 { 502 struct amradio_device *radio = vdev_to_amradio(video_devdata(file)); 503 int retval = 0; 504 505 mutex_lock(&radio->lock); 506 507 if (!radio->usbdev) { 508 retval = -EIO; 509 goto unlock; 510 } 511 512 file->private_data = radio; 513 514 if (unlikely(!radio->initialized)) 515 retval = usb_amradio_init(radio); 516 517 unlock: 518 mutex_unlock(&radio->lock); 519 return retval; 520 } 521 522 /*close device */ 523 static int usb_amradio_close(struct file *file) 524 { 525 struct amradio_device *radio = file->private_data; 526 int retval = 0; 527 528 mutex_lock(&radio->lock); 529 530 if (!radio->usbdev) 531 retval = -EIO; 532 533 mutex_unlock(&radio->lock); 534 return retval; 535 } 536 537 static long usb_amradio_ioctl(struct file *file, unsigned int cmd, 538 unsigned long arg) 539 { 540 struct amradio_device *radio = file->private_data; 541 long retval = 0; 542 543 mutex_lock(&radio->lock); 544 545 if (!radio->usbdev) { 546 retval = -EIO; 547 goto unlock; 548 } 549 550 retval = video_ioctl2(file, cmd, arg); 551 552 unlock: 553 mutex_unlock(&radio->lock); 554 return retval; 555 } 556 557 /* Suspend device - stop device. Need to be checked and fixed */ 558 static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message) 559 { 560 struct amradio_device *radio = usb_get_intfdata(intf); 561 562 mutex_lock(&radio->lock); 563 564 if (!radio->muted && radio->initialized) { 565 amradio_set_mute(radio, AMRADIO_STOP); 566 radio->muted = 0; 567 } 568 569 dev_info(&intf->dev, "going into suspend..\n"); 570 571 mutex_unlock(&radio->lock); 572 return 0; 573 } 574 575 /* Resume device - start device. Need to be checked and fixed */ 576 static int usb_amradio_resume(struct usb_interface *intf) 577 { 578 struct amradio_device *radio = usb_get_intfdata(intf); 579 580 mutex_lock(&radio->lock); 581 582 if (unlikely(!radio->initialized)) 583 goto unlock; 584 585 if (radio->stereo) 586 amradio_set_stereo(radio, WANT_STEREO); 587 else 588 amradio_set_stereo(radio, WANT_MONO); 589 590 amradio_setfreq(radio, radio->curfreq); 591 592 if (!radio->muted) 593 amradio_set_mute(radio, AMRADIO_START); 594 595 unlock: 596 dev_info(&intf->dev, "coming out of suspend..\n"); 597 598 mutex_unlock(&radio->lock); 599 return 0; 600 } 601 602 /* File system interface */ 603 static const struct v4l2_file_operations usb_amradio_fops = { 604 .owner = THIS_MODULE, 605 .open = usb_amradio_open, 606 .release = usb_amradio_close, 607 .ioctl = usb_amradio_ioctl, 608 }; 609 610 static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = { 611 .vidioc_querycap = vidioc_querycap, 612 .vidioc_g_tuner = vidioc_g_tuner, 613 .vidioc_s_tuner = vidioc_s_tuner, 614 .vidioc_g_frequency = vidioc_g_frequency, 615 .vidioc_s_frequency = vidioc_s_frequency, 616 .vidioc_queryctrl = vidioc_queryctrl, 617 .vidioc_g_ctrl = vidioc_g_ctrl, 618 .vidioc_s_ctrl = vidioc_s_ctrl, 619 .vidioc_g_audio = vidioc_g_audio, 620 .vidioc_s_audio = vidioc_s_audio, 621 .vidioc_g_input = vidioc_g_input, 622 .vidioc_s_input = vidioc_s_input, 623 }; 624 625 static void usb_amradio_video_device_release(struct video_device *videodev) 626 { 627 struct amradio_device *radio = vdev_to_amradio(videodev); 628 629 v4l2_device_unregister(&radio->v4l2_dev); 630 631 /* free rest memory */ 632 kfree(radio->buffer); 633 kfree(radio); 634 } 635 636 /* check if the device is present and register with v4l and usb if it is */ 637 static int usb_amradio_probe(struct usb_interface *intf, 638 const struct usb_device_id *id) 639 { 640 struct amradio_device *radio; 641 int retval = 0; 642 643 radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL); 644 645 if (!radio) { 646 dev_err(&intf->dev, "kmalloc for amradio_device failed\n"); 647 retval = -ENOMEM; 648 goto err; 649 } 650 651 radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL); 652 653 if (!radio->buffer) { 654 dev_err(&intf->dev, "kmalloc for radio->buffer failed\n"); 655 retval = -ENOMEM; 656 goto err_nobuf; 657 } 658 659 retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev); 660 if (retval < 0) { 661 dev_err(&intf->dev, "couldn't register v4l2_device\n"); 662 goto err_v4l2; 663 } 664 665 strlcpy(radio->videodev.name, radio->v4l2_dev.name, 666 sizeof(radio->videodev.name)); 667 radio->videodev.v4l2_dev = &radio->v4l2_dev; 668 radio->videodev.fops = &usb_amradio_fops; 669 radio->videodev.ioctl_ops = &usb_amradio_ioctl_ops; 670 radio->videodev.release = usb_amradio_video_device_release; 671 672 radio->usbdev = interface_to_usbdev(intf); 673 radio->curfreq = 95.16 * FREQ_MUL; 674 675 mutex_init(&radio->lock); 676 677 video_set_drvdata(&radio->videodev, radio); 678 679 retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO, 680 radio_nr); 681 if (retval < 0) { 682 dev_err(&intf->dev, "could not register video device\n"); 683 goto err_vdev; 684 } 685 686 usb_set_intfdata(intf, radio); 687 return 0; 688 689 err_vdev: 690 v4l2_device_unregister(&radio->v4l2_dev); 691 err_v4l2: 692 kfree(radio->buffer); 693 err_nobuf: 694 kfree(radio); 695 err: 696 return retval; 697 } 698 699 static int __init amradio_init(void) 700 { 701 int retval = usb_register(&usb_amradio_driver); 702 703 pr_info(KBUILD_MODNAME 704 ": version " DRIVER_VERSION " " DRIVER_DESC "\n"); 705 706 if (retval) 707 pr_err(KBUILD_MODNAME 708 ": usb_register failed. Error number %d\n", retval); 709 710 return retval; 711 } 712 713 static void __exit amradio_exit(void) 714 { 715 usb_deregister(&usb_amradio_driver); 716 } 717 718 module_init(amradio_init); 719 module_exit(amradio_exit); 720 721