radio-mr800.c revision 4e3616576e9e65d53f9381b9f334257299c7262e 
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
76MODULE_AUTHOR(DRIVER_AUTHOR);
77MODULE_DESCRIPTION(DRIVER_DESC);
78MODULE_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/* Probably USB_TIMEOUT should be modified in module parameter */
89#define BUFFER_LENGTH 8
90#define USB_TIMEOUT 500
91
92/* Frequency limits in MHz -- these are European values.  For Japanese
93devices, that would be 76 and 91.  */
94#define FREQ_MIN  87.5
95#define FREQ_MAX 108.0
96#define FREQ_MUL 16000
97
98/*
99 * Commands that device should understand
100 * List isnt full and will be updated with implementation of new functions
101 */
102#define AMRADIO_SET_FREQ	0xa4
103#define AMRADIO_SET_MUTE	0xab
104#define AMRADIO_SET_MONO	0xae
105
106/* Comfortable defines for amradio_set_mute */
107#define AMRADIO_START		0x00
108#define AMRADIO_STOP		0x01
109
110/* Comfortable defines for amradio_set_stereo */
111#define WANT_STEREO		0x00
112#define WANT_MONO		0x01
113
114/* module parameter */
115static int radio_nr = -1;
116module_param(radio_nr, int, 0);
117MODULE_PARM_DESC(radio_nr, "Radio Nr");
118
119static int usb_amradio_probe(struct usb_interface *intf,
120			     const struct usb_device_id *id);
121static void usb_amradio_disconnect(struct usb_interface *intf);
122static int usb_amradio_open(struct file *file);
123static int usb_amradio_close(struct file *file);
124static int usb_amradio_suspend(struct usb_interface *intf,
125				pm_message_t message);
126static int usb_amradio_resume(struct usb_interface *intf);
127
128/* Data for one (physical) device */
129struct amradio_device {
130	/* reference to USB and video device */
131	struct usb_device *usbdev;
132	struct video_device videodev;
133	struct v4l2_device v4l2_dev;
134
135	unsigned char *buffer;
136	struct mutex lock;	/* buffer locking */
137	int curfreq;
138	int stereo;
139	int users;
140	int muted;
141};
142
143#define vdev_to_amradio(r) container_of(r, struct amradio_device, videodev)
144
145/* USB Device ID List */
146static struct usb_device_id usb_amradio_device_table[] = {
147	{USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
148							USB_CLASS_HID, 0, 0) },
149	{ }						/* Terminating entry */
150};
151
152MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);
153
154/* USB subsystem interface */
155static struct usb_driver usb_amradio_driver = {
156	.name			= MR800_DRIVER_NAME,
157	.probe			= usb_amradio_probe,
158	.disconnect		= usb_amradio_disconnect,
159	.suspend		= usb_amradio_suspend,
160	.resume			= usb_amradio_resume,
161	.reset_resume		= usb_amradio_resume,
162	.id_table		= usb_amradio_device_table,
163	.supports_autosuspend	= 0,
164};
165
166/* switch on/off the radio. Send 8 bytes to device */
167static int amradio_set_mute(struct amradio_device *radio, char argument)
168{
169	int retval;
170	int size;
171
172	BUG_ON(!mutex_is_locked(&radio->lock));
173
174	radio->buffer[0] = 0x00;
175	radio->buffer[1] = 0x55;
176	radio->buffer[2] = 0xaa;
177	radio->buffer[3] = 0x00;
178	radio->buffer[4] = AMRADIO_SET_MUTE;
179	radio->buffer[5] = argument;
180	radio->buffer[6] = 0x00;
181	radio->buffer[7] = 0x00;
182
183	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
184		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
185
186	if (retval < 0 || size != BUFFER_LENGTH)
187		return retval;
188
189	radio->muted = argument;
190
191	return retval;
192}
193
194/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
195static int amradio_setfreq(struct amradio_device *radio, int freq)
196{
197	int retval;
198	int size;
199	unsigned short freq_send = 0x10 + (freq >> 3) / 25;
200
201	BUG_ON(!mutex_is_locked(&radio->lock));
202
203	radio->buffer[0] = 0x00;
204	radio->buffer[1] = 0x55;
205	radio->buffer[2] = 0xaa;
206	radio->buffer[3] = 0x03;
207	radio->buffer[4] = AMRADIO_SET_FREQ;
208	radio->buffer[5] = 0x00;
209	radio->buffer[6] = 0x00;
210	radio->buffer[7] = 0x08;
211
212	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
213		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
214
215	if (retval < 0 || size != BUFFER_LENGTH)
216		return retval;
217
218	/* frequency is calculated from freq_send and placed in first 2 bytes */
219	radio->buffer[0] = (freq_send >> 8) & 0xff;
220	radio->buffer[1] = freq_send & 0xff;
221	radio->buffer[2] = 0x01;
222	radio->buffer[3] = 0x00;
223	radio->buffer[4] = 0x00;
224	/* 5 and 6 bytes of buffer already = 0x00 */
225	radio->buffer[7] = 0x00;
226
227	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
228		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
229
230	return retval;
231}
232
233static int amradio_set_stereo(struct amradio_device *radio, char argument)
234{
235	int retval;
236	int size;
237
238	BUG_ON(!mutex_is_locked(&radio->lock));
239
240	radio->buffer[0] = 0x00;
241	radio->buffer[1] = 0x55;
242	radio->buffer[2] = 0xaa;
243	radio->buffer[3] = 0x00;
244	radio->buffer[4] = AMRADIO_SET_MONO;
245	radio->buffer[5] = argument;
246	radio->buffer[6] = 0x00;
247	radio->buffer[7] = 0x00;
248
249	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
250		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
251
252	if (retval < 0 || size != BUFFER_LENGTH) {
253		radio->stereo = -1;
254		return retval;
255	}
256
257	radio->stereo = 1;
258
259	return retval;
260}
261
262/* Handle unplugging the device.
263 * We call video_unregister_device in any case.
264 * The last function called in this procedure is
265 * usb_amradio_device_release.
266 */
267static void usb_amradio_disconnect(struct usb_interface *intf)
268{
269	struct amradio_device *radio = usb_get_intfdata(intf);
270
271	mutex_lock(&radio->lock);
272	radio->usbdev = NULL;
273	mutex_unlock(&radio->lock);
274
275	usb_set_intfdata(intf, NULL);
276	v4l2_device_disconnect(&radio->v4l2_dev);
277	video_unregister_device(&radio->videodev);
278}
279
280/* vidioc_querycap - query device capabilities */
281static int vidioc_querycap(struct file *file, void *priv,
282					struct v4l2_capability *v)
283{
284	struct amradio_device *radio = file->private_data;
285
286	strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
287	strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
288	usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
289	v->version = RADIO_VERSION;
290	v->capabilities = V4L2_CAP_TUNER;
291	return 0;
292}
293
294/* vidioc_g_tuner - get tuner attributes */
295static int vidioc_g_tuner(struct file *file, void *priv,
296				struct v4l2_tuner *v)
297{
298	struct amradio_device *radio = file->private_data;
299	int retval;
300
301	if (v->index > 0)
302		return -EINVAL;
303
304/* TODO: Add function which look is signal stereo or not
305 * 	amradio_getstat(radio);
306 */
307
308/* we call amradio_set_stereo to set radio->stereo
309 * Honestly, amradio_getstat should cover this in future and
310 * amradio_set_stereo shouldn't be here
311 */
312	retval = amradio_set_stereo(radio, WANT_STEREO);
313	if (retval < 0)
314		amradio_dev_warn(&radio->videodev.dev,
315			"set stereo failed\n");
316
317	strcpy(v->name, "FM");
318	v->type = V4L2_TUNER_RADIO;
319	v->rangelow = FREQ_MIN * FREQ_MUL;
320	v->rangehigh = FREQ_MAX * FREQ_MUL;
321	v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
322	v->capability = V4L2_TUNER_CAP_LOW;
323	if (radio->stereo)
324		v->audmode = V4L2_TUNER_MODE_STEREO;
325	else
326		v->audmode = V4L2_TUNER_MODE_MONO;
327	v->signal = 0xffff;     /* Can't get the signal strength, sad.. */
328	v->afc = 0; /* Don't know what is this */
329
330	return retval;
331}
332
333/* vidioc_s_tuner - set tuner attributes */
334static int vidioc_s_tuner(struct file *file, void *priv,
335				struct v4l2_tuner *v)
336{
337	struct amradio_device *radio = file->private_data;
338	int retval = -EINVAL;
339
340	if (v->index > 0)
341		return -EINVAL;
342
343	/* mono/stereo selector */
344	switch (v->audmode) {
345	case V4L2_TUNER_MODE_MONO:
346		retval = amradio_set_stereo(radio, WANT_MONO);
347		if (retval < 0)
348			amradio_dev_warn(&radio->videodev.dev,
349				"set mono failed\n");
350		break;
351	case V4L2_TUNER_MODE_STEREO:
352		retval = amradio_set_stereo(radio, WANT_STEREO);
353		if (retval < 0)
354			amradio_dev_warn(&radio->videodev.dev,
355				"set stereo failed\n");
356		break;
357	}
358
359	return retval;
360}
361
362/* vidioc_s_frequency - set tuner radio frequency */
363static int vidioc_s_frequency(struct file *file, void *priv,
364				struct v4l2_frequency *f)
365{
366	struct amradio_device *radio = file->private_data;
367	int retval = 0;
368
369	radio->curfreq = f->frequency;
370
371	retval = amradio_setfreq(radio, radio->curfreq);
372	if (retval < 0)
373		amradio_dev_warn(&radio->videodev.dev,
374			"set frequency failed\n");
375
376	return retval;
377}
378
379/* vidioc_g_frequency - get tuner radio frequency */
380static int vidioc_g_frequency(struct file *file, void *priv,
381				struct v4l2_frequency *f)
382{
383	struct amradio_device *radio = file->private_data;
384
385	f->type = V4L2_TUNER_RADIO;
386	f->frequency = radio->curfreq;
387
388	return 0;
389}
390
391/* vidioc_queryctrl - enumerate control items */
392static int vidioc_queryctrl(struct file *file, void *priv,
393				struct v4l2_queryctrl *qc)
394{
395	switch (qc->id) {
396	case V4L2_CID_AUDIO_MUTE:
397		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
398	}
399
400	return -EINVAL;
401}
402
403/* vidioc_g_ctrl - get the value of a control */
404static int vidioc_g_ctrl(struct file *file, void *priv,
405				struct v4l2_control *ctrl)
406{
407	struct amradio_device *radio = file->private_data;
408
409	switch (ctrl->id) {
410	case V4L2_CID_AUDIO_MUTE:
411		ctrl->value = radio->muted;
412		return 0;
413	}
414
415	return -EINVAL;
416}
417
418/* vidioc_s_ctrl - set the value of a control */
419static int vidioc_s_ctrl(struct file *file, void *priv,
420				struct v4l2_control *ctrl)
421{
422	struct amradio_device *radio = file->private_data;
423	int retval = -EINVAL;
424
425	switch (ctrl->id) {
426	case V4L2_CID_AUDIO_MUTE:
427		if (ctrl->value) {
428			retval = amradio_set_mute(radio, AMRADIO_STOP);
429			if (retval < 0) {
430				amradio_dev_warn(&radio->videodev.dev,
431					"amradio_stop failed\n");
432			}
433		} else {
434			retval = amradio_set_mute(radio, AMRADIO_START);
435			if (retval < 0) {
436				amradio_dev_warn(&radio->videodev.dev,
437					"amradio_start failed\n");
438			}
439		}
440		break;
441	}
442
443	return retval;
444}
445
446/* vidioc_g_audio - get audio attributes */
447static int vidioc_g_audio(struct file *file, void *priv,
448				struct v4l2_audio *a)
449{
450	if (a->index > 1)
451		return -EINVAL;
452
453	strcpy(a->name, "Radio");
454	a->capability = V4L2_AUDCAP_STEREO;
455	return 0;
456}
457
458/* vidioc_s_audio - set audio attributes  */
459static int vidioc_s_audio(struct file *file, void *priv,
460					struct v4l2_audio *a)
461{
462	if (a->index != 0)
463		return -EINVAL;
464	return 0;
465}
466
467/* vidioc_g_input - get input */
468static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
469{
470	*i = 0;
471	return 0;
472}
473
474/* vidioc_s_input - set input */
475static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
476{
477	if (i != 0)
478		return -EINVAL;
479	return 0;
480}
481
482/* open device - amradio_start() and amradio_setfreq() */
483static int usb_amradio_open(struct file *file)
484{
485	struct amradio_device *radio = vdev_to_amradio(video_devdata(file));
486	int retval = 0;
487
488	mutex_lock(&radio->lock);
489
490	if (!radio->usbdev) {
491		retval = -EIO;
492		goto unlock;
493	}
494
495	file->private_data = radio;
496	radio->users = 1;
497	radio->muted = 1;
498
499	retval = amradio_set_mute(radio, AMRADIO_START);
500	if (retval < 0) {
501		amradio_dev_warn(&radio->videodev.dev,
502			"radio did not start up properly\n");
503		radio->users = 0;
504		goto unlock;
505	}
506
507	retval = amradio_set_stereo(radio, WANT_STEREO);
508	if (retval < 0)
509		amradio_dev_warn(&radio->videodev.dev,
510			"set stereo failed\n");
511
512	retval = amradio_setfreq(radio, radio->curfreq);
513	if (retval < 0)
514		amradio_dev_warn(&radio->videodev.dev,
515			"set frequency failed\n");
516
517unlock:
518	mutex_unlock(&radio->lock);
519	return retval;
520}
521
522/*close device */
523static 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		goto unlock;
533	}
534
535	radio->users = 0;
536
537	retval = amradio_set_mute(radio, AMRADIO_STOP);
538	if (retval < 0)
539		amradio_dev_warn(&radio->videodev.dev,
540			"amradio_stop failed\n");
541
542unlock:
543	mutex_unlock(&radio->lock);
544	return retval;
545}
546
547static long usb_amradio_ioctl(struct file *file, unsigned int cmd,
548				unsigned long arg)
549{
550	struct amradio_device *radio = file->private_data;
551	long retval = 0;
552
553	mutex_lock(&radio->lock);
554
555	if (!radio->usbdev) {
556		retval = -EIO;
557		goto unlock;
558	}
559
560	retval = video_ioctl2(file, cmd, arg);
561
562unlock:
563	mutex_unlock(&radio->lock);
564	return retval;
565}
566
567/* Suspend device - stop device. Need to be checked and fixed */
568static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
569{
570	struct amradio_device *radio = usb_get_intfdata(intf);
571	int retval;
572
573	mutex_lock(&radio->lock);
574
575	retval = amradio_set_mute(radio, AMRADIO_STOP);
576	if (retval < 0)
577		dev_warn(&intf->dev, "amradio_stop failed\n");
578
579	dev_info(&intf->dev, "going into suspend..\n");
580
581	mutex_unlock(&radio->lock);
582	return 0;
583}
584
585/* Resume device - start device. Need to be checked and fixed */
586static int usb_amradio_resume(struct usb_interface *intf)
587{
588	struct amradio_device *radio = usb_get_intfdata(intf);
589	int retval;
590
591	mutex_lock(&radio->lock);
592
593	retval = amradio_set_mute(radio, AMRADIO_START);
594	if (retval < 0)
595		dev_warn(&intf->dev, "amradio_start failed\n");
596
597	dev_info(&intf->dev, "coming out of suspend..\n");
598
599	mutex_unlock(&radio->lock);
600	return 0;
601}
602
603/* File system interface */
604static const struct v4l2_file_operations usb_amradio_fops = {
605	.owner		= THIS_MODULE,
606	.open		= usb_amradio_open,
607	.release	= usb_amradio_close,
608	.ioctl		= usb_amradio_ioctl,
609};
610
611static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = {
612	.vidioc_querycap    = vidioc_querycap,
613	.vidioc_g_tuner     = vidioc_g_tuner,
614	.vidioc_s_tuner     = vidioc_s_tuner,
615	.vidioc_g_frequency = vidioc_g_frequency,
616	.vidioc_s_frequency = vidioc_s_frequency,
617	.vidioc_queryctrl   = vidioc_queryctrl,
618	.vidioc_g_ctrl      = vidioc_g_ctrl,
619	.vidioc_s_ctrl      = vidioc_s_ctrl,
620	.vidioc_g_audio     = vidioc_g_audio,
621	.vidioc_s_audio     = vidioc_s_audio,
622	.vidioc_g_input     = vidioc_g_input,
623	.vidioc_s_input     = vidioc_s_input,
624};
625
626static void usb_amradio_video_device_release(struct video_device *videodev)
627{
628	struct amradio_device *radio = vdev_to_amradio(videodev);
629
630	v4l2_device_unregister(&radio->v4l2_dev);
631
632	/* free rest memory */
633	kfree(radio->buffer);
634	kfree(radio);
635}
636
637/* check if the device is present and register with v4l and usb if it is */
638static int usb_amradio_probe(struct usb_interface *intf,
639				const struct usb_device_id *id)
640{
641	struct amradio_device *radio;
642	int retval = 0;
643
644	radio = kzalloc(sizeof(struct amradio_device), GFP_KERNEL);
645
646	if (!radio) {
647		dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
648		retval = -ENOMEM;
649		goto err;
650	}
651
652	radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
653
654	if (!radio->buffer) {
655		dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
656		retval = -ENOMEM;
657		goto err_nobuf;
658	}
659
660	retval = v4l2_device_register(&intf->dev, &radio->v4l2_dev);
661	if (retval < 0) {
662		dev_err(&intf->dev, "couldn't register v4l2_device\n");
663		goto err_v4l2;
664	}
665
666	strlcpy(radio->videodev.name, radio->v4l2_dev.name,
667		sizeof(radio->videodev.name));
668	radio->videodev.v4l2_dev = &radio->v4l2_dev;
669	radio->videodev.fops = &usb_amradio_fops;
670	radio->videodev.ioctl_ops = &usb_amradio_ioctl_ops;
671	radio->videodev.release = usb_amradio_video_device_release;
672
673	radio->users = 0;
674	radio->usbdev = interface_to_usbdev(intf);
675	radio->curfreq = 95.16 * FREQ_MUL;
676	radio->stereo = -1;
677
678	mutex_init(&radio->lock);
679
680	video_set_drvdata(&radio->videodev, radio);
681
682	retval = video_register_device(&radio->videodev, VFL_TYPE_RADIO,
683					radio_nr);
684	if (retval < 0) {
685		dev_err(&intf->dev, "could not register video device\n");
686		goto err_vdev;
687	}
688
689	usb_set_intfdata(intf, radio);
690	return 0;
691
692err_vdev:
693	v4l2_device_unregister(&radio->v4l2_dev);
694err_v4l2:
695	kfree(radio->buffer);
696err_nobuf:
697	kfree(radio);
698err:
699	return retval;
700}
701
702static int __init amradio_init(void)
703{
704	int retval = usb_register(&usb_amradio_driver);
705
706	pr_info(KBUILD_MODNAME
707		": version " DRIVER_VERSION " " DRIVER_DESC "\n");
708
709	if (retval)
710		pr_err(KBUILD_MODNAME
711			": usb_register failed. Error number %d\n", retval);
712
713	return retval;
714}
715
716static void __exit amradio_exit(void)
717{
718	usb_deregister(&usb_amradio_driver);
719}
720
721module_init(amradio_init);
722module_exit(amradio_exit);
723
724