[deliverable/linux.git] / drivers / media / radio / radio-mr800.c

/*
 * A driver for the AverMedia MR 800 USB FM radio. This device plugs
 * into both the USB and an analog audio input, so this thing
 * only deals with initialization and frequency setting, the
 * audio data has to be handled by a sound driver.
 *
 * Copyright (c) 2008 Alexey Klimov <klimov.linux@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 * Big thanks to authors of dsbr100.c and radio-si470x.c
 *
 * When work was looked pretty good, i discover this:
 * http://av-usbradio.sourceforge.net/index.php
 * http://sourceforge.net/projects/av-usbradio/
 * Latest release of theirs project was in 2005.
 * Probably, this driver could be improved trough using their
 * achievements (specifications given).
 * So, we have smth to begin with.
 *
 * History:
 * Version 0.01:	First working version.
 * 			It's required to blacklist AverMedia USB Radio
 * 			in usbhid/hid-quirks.c
 *
 * Many things to do:
 * 	- Correct power managment of device (suspend & resume)
 * 	- Make x86 independance (little-endian and big-endian stuff)
 * 	- Add code for scanning and smooth tuning
 * 	- Checked and add stereo&mono stuff
 * 	- Add code for sensitivity value
 * 	- Correct mistakes
 * 	- In Japan another FREQ_MIN and FREQ_MAX
 */

/* kernel includes */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <linux/usb.h>
#include <linux/version.h>	/* for KERNEL_VERSION MACRO */

/* driver and module definitions */
#define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>"
#define DRIVER_DESC "AverMedia MR 800 USB FM radio driver"
#define DRIVER_VERSION "0.01"
#define RADIO_VERSION KERNEL_VERSION(0, 0, 1)

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

#define USB_AMRADIO_VENDOR 0x07ca
#define USB_AMRADIO_PRODUCT 0xb800

/* dev_warn macro with driver name */
#define MR800_DRIVER_NAME "radio-mr800"
#define amradio_dev_warn(dev, fmt, arg...)				\
		dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg)

/* Probably USB_TIMEOUT should be modified in module parameter */
#define BUFFER_LENGTH 8
#define USB_TIMEOUT 500

/* Frequency limits in MHz -- these are European values.  For Japanese
devices, that would be 76 and 91.  */
#define FREQ_MIN  87.5
#define FREQ_MAX 108.0
#define FREQ_MUL 16000

/* module parameter */
static int radio_nr = -1;
module_param(radio_nr, int, 0);
MODULE_PARM_DESC(radio_nr, "Radio Nr");

static struct v4l2_queryctrl radio_qctrl[] = {
	{
		.id            = V4L2_CID_AUDIO_MUTE,
		.name          = "Mute",
		.minimum       = 0,
		.maximum       = 1,
		.step	       = 1,
		.default_value = 1,
		.type          = V4L2_CTRL_TYPE_BOOLEAN,
	},
/* HINT: the disabled controls are only here to satify kradio and such apps */
	{	.id		= V4L2_CID_AUDIO_VOLUME,
		.flags		= V4L2_CTRL_FLAG_DISABLED,
	},
	{
		.id		= V4L2_CID_AUDIO_BALANCE,
		.flags		= V4L2_CTRL_FLAG_DISABLED,
	},
	{
		.id		= V4L2_CID_AUDIO_BASS,
		.flags		= V4L2_CTRL_FLAG_DISABLED,
	},
	{
		.id		= V4L2_CID_AUDIO_TREBLE,
		.flags		= V4L2_CTRL_FLAG_DISABLED,
	},
	{
		.id		= V4L2_CID_AUDIO_LOUDNESS,
		.flags		= V4L2_CTRL_FLAG_DISABLED,
	},
};

static int usb_amradio_probe(struct usb_interface *intf,
			     const struct usb_device_id *id);
static void usb_amradio_disconnect(struct usb_interface *intf);
static int usb_amradio_open(struct file *file);
static int usb_amradio_close(struct file *file);
static int usb_amradio_suspend(struct usb_interface *intf,
				pm_message_t message);
static int usb_amradio_resume(struct usb_interface *intf);

/* Data for one (physical) device */
struct amradio_device {
	/* reference to USB and video device */
	struct usb_device *usbdev;
	struct video_device *videodev;

	unsigned char *buffer;
	struct mutex lock;	/* buffer locking */
	int curfreq;
	int stereo;
	int users;
	int removed;
	int muted;
};

/* USB Device ID List */
static struct usb_device_id usb_amradio_device_table[] = {
	{USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
							USB_CLASS_HID, 0, 0) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);

/* USB subsystem interface */
static struct usb_driver usb_amradio_driver = {
	.name			= MR800_DRIVER_NAME,
	.probe			= usb_amradio_probe,
	.disconnect		= usb_amradio_disconnect,
	.suspend		= usb_amradio_suspend,
	.resume			= usb_amradio_resume,
	.reset_resume		= usb_amradio_resume,
	.id_table		= usb_amradio_device_table,
	.supports_autosuspend	= 0,
};

/* switch on radio. Send 8 bytes to device. */
static int amradio_start(struct amradio_device *radio)
{
	int retval;
	int size;

	mutex_lock(&radio->lock);

	radio->buffer[0] = 0x00;
	radio->buffer[1] = 0x55;
	radio->buffer[2] = 0xaa;
	radio->buffer[3] = 0x00;
	radio->buffer[4] = 0xab;
	radio->buffer[5] = 0x00;
	radio->buffer[6] = 0x00;
	radio->buffer[7] = 0x00;

	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);

	if (retval) {
		mutex_unlock(&radio->lock);
		return retval;
	}

	radio->muted = 0;

	mutex_unlock(&radio->lock);

	return retval;
}

/* switch off radio */
static int amradio_stop(struct amradio_device *radio)
{
	int retval;
	int size;

	/* safety check */
	if (radio->removed)
		return -EIO;

	mutex_lock(&radio->lock);

	radio->buffer[0] = 0x00;
	radio->buffer[1] = 0x55;
	radio->buffer[2] = 0xaa;
	radio->buffer[3] = 0x00;
	radio->buffer[4] = 0xab;
	radio->buffer[5] = 0x01;
	radio->buffer[6] = 0x00;
	radio->buffer[7] = 0x00;

	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);

	if (retval) {
		mutex_unlock(&radio->lock);
		return retval;
	}

	radio->muted = 1;

	mutex_unlock(&radio->lock);

	return retval;
}

/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
static int amradio_setfreq(struct amradio_device *radio, int freq)
{
	int retval;
	int size;
	unsigned short freq_send = 0x13 + (freq >> 3) / 25;

	/* safety check */
	if (radio->removed)
		return -EIO;

	mutex_lock(&radio->lock);

	radio->buffer[0] = 0x00;
	radio->buffer[1] = 0x55;
	radio->buffer[2] = 0xaa;
	radio->buffer[3] = 0x03;
	radio->buffer[4] = 0xa4;
	radio->buffer[5] = 0x00;
	radio->buffer[6] = 0x00;
	radio->buffer[7] = 0x08;

	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);

	if (retval) {
		mutex_unlock(&radio->lock);
		return retval;
	}

	/* frequency is calculated from freq_send and placed in first 2 bytes */
	radio->buffer[0] = (freq_send >> 8) & 0xff;
	radio->buffer[1] = freq_send & 0xff;
	radio->buffer[2] = 0x01;
	radio->buffer[3] = 0x00;
	radio->buffer[4] = 0x00;
	/* 5 and 6 bytes of buffer already = 0x00 */
	radio->buffer[7] = 0x00;

	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
		(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);

	if (retval) {
		mutex_unlock(&radio->lock);
		return retval;
	}

	radio->stereo = 0;

	mutex_unlock(&radio->lock);

	return retval;
}

/* USB subsystem interface begins here */

/* handle unplugging of the device, release data structures
if nothing keeps us from doing it.  If something is still
keeping us busy, the release callback of v4l will take care
of releasing it. */
static void usb_amradio_disconnect(struct usb_interface *intf)
{
	struct amradio_device *radio = usb_get_intfdata(intf);

	mutex_lock(&radio->lock);
	radio->removed = 1;
	mutex_unlock(&radio->lock);

	usb_set_intfdata(intf, NULL);
	video_unregister_device(radio->videodev);
}

/* vidioc_querycap - query device capabilities */
static int vidioc_querycap(struct file *file, void *priv,
					struct v4l2_capability *v)
{
	struct amradio_device *radio = video_drvdata(file);

	strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
	strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
	usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER;
	return 0;
}

/* vidioc_g_tuner - get tuner attributes */
static int vidioc_g_tuner(struct file *file, void *priv,
				struct v4l2_tuner *v)
{
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	/* safety check */
	if (radio->removed)
		return -EIO;

	if (v->index > 0)
		return -EINVAL;

/* TODO: Add function which look is signal stereo or not
 * 	amradio_getstat(radio);
 */
	radio->stereo = -1;
	strcpy(v->name, "FM");
	v->type = V4L2_TUNER_RADIO;
	v->rangelow = FREQ_MIN * FREQ_MUL;
	v->rangehigh = FREQ_MAX * FREQ_MUL;
	v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
	v->capability = V4L2_TUNER_CAP_LOW;
	if (radio->stereo)
		v->audmode = V4L2_TUNER_MODE_STEREO;
	else
		v->audmode = V4L2_TUNER_MODE_MONO;
	v->signal = 0xffff;     /* Can't get the signal strength, sad.. */
	v->afc = 0; /* Don't know what is this */
	return 0;
}

/* vidioc_s_tuner - set tuner attributes */
static int vidioc_s_tuner(struct file *file, void *priv,
				struct v4l2_tuner *v)
{
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	/* safety check */
	if (radio->removed)
		return -EIO;

	if (v->index > 0)
		return -EINVAL;
	return 0;
}

/* vidioc_s_frequency - set tuner radio frequency */
static int vidioc_s_frequency(struct file *file, void *priv,
				struct v4l2_frequency *f)
{
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
	int retval;

	/* safety check */
	if (radio->removed)
		return -EIO;

	radio->curfreq = f->frequency;
	retval = amradio_setfreq(radio, radio->curfreq);
	if (retval < 0)
		amradio_dev_warn(&radio->videodev->dev,
			"set frequency failed\n");
	return 0;
}

/* vidioc_g_frequency - get tuner radio frequency */
static int vidioc_g_frequency(struct file *file, void *priv,
				struct v4l2_frequency *f)
{
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	/* safety check */
	if (radio->removed)
		return -EIO;

	f->type = V4L2_TUNER_RADIO;
	f->frequency = radio->curfreq;
	return 0;
}

/* vidioc_queryctrl - enumerate control items */
static int vidioc_queryctrl(struct file *file, void *priv,
				struct v4l2_queryctrl *qc)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
		if (qc->id && qc->id == radio_qctrl[i].id) {
			memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
			return 0;
		}
	}
	return -EINVAL;
}

/* vidioc_g_ctrl - get the value of a control */
static int vidioc_g_ctrl(struct file *file, void *priv,
				struct v4l2_control *ctrl)
{
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));

	/* safety check */
	if (radio->removed)
		return -EIO;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		ctrl->value = radio->muted;
		return 0;
	}
	return -EINVAL;
}

/* vidioc_s_ctrl - set the value of a control */
static int vidioc_s_ctrl(struct file *file, void *priv,
				struct v4l2_control *ctrl)
{
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
	int retval;

	/* safety check */
	if (radio->removed)
		return -EIO;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		if (ctrl->value) {
			retval = amradio_stop(radio);
			if (retval < 0) {
				amradio_dev_warn(&radio->videodev->dev,
					"amradio_stop failed\n");
				return -1;
			}
		} else {
			retval = amradio_start(radio);
			if (retval < 0) {
				amradio_dev_warn(&radio->videodev->dev,
					"amradio_start failed\n");
				return -1;
			}
		}
		return 0;
	}
	return -EINVAL;
}

/* vidioc_g_audio - get audio attributes */
static int vidioc_g_audio(struct file *file, void *priv,
				struct v4l2_audio *a)
{
	if (a->index > 1)
		return -EINVAL;

	strcpy(a->name, "Radio");
	a->capability = V4L2_AUDCAP_STEREO;
	return 0;
}

/* vidioc_s_audio - set audio attributes  */
static int vidioc_s_audio(struct file *file, void *priv,
					struct v4l2_audio *a)
{
	if (a->index != 0)
		return -EINVAL;
	return 0;
}

/* vidioc_g_input - get input */
static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

/* vidioc_s_input - set input */
static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
	if (i != 0)
		return -EINVAL;
	return 0;
}

/* open device - amradio_start() and amradio_setfreq() */
static int usb_amradio_open(struct file *file)
{
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
	int retval;

	lock_kernel();

	radio->users = 1;
	radio->muted = 1;

	retval = amradio_start(radio);
	if (retval < 0) {
		amradio_dev_warn(&radio->videodev->dev,
			"radio did not start up properly\n");
		radio->users = 0;
		unlock_kernel();
		return -EIO;
	}

	retval = amradio_setfreq(radio, radio->curfreq);
	if (retval < 0)
		amradio_dev_warn(&radio->videodev->dev,
			"set frequency failed\n");

	unlock_kernel();
	return 0;
}

/*close device */
static int usb_amradio_close(struct file *file)
{
	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
	int retval;

	if (!radio)
		return -ENODEV;

	radio->users = 0;

	if (!radio->removed) {
		retval = amradio_stop(radio);
		if (retval < 0)
			amradio_dev_warn(&radio->videodev->dev,
				"amradio_stop failed\n");
	}

	return 0;
}

/* Suspend device - stop device. Need to be checked and fixed */
static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct amradio_device *radio = usb_get_intfdata(intf);
	int retval;

	retval = amradio_stop(radio);
	if (retval < 0)
		dev_warn(&intf->dev, "amradio_stop failed\n");

	dev_info(&intf->dev, "going into suspend..\n");

	return 0;
}

/* Resume device - start device. Need to be checked and fixed */
static int usb_amradio_resume(struct usb_interface *intf)
{
	struct amradio_device *radio = usb_get_intfdata(intf);
	int retval;

	retval = amradio_start(radio);
	if (retval < 0)
		dev_warn(&intf->dev, "amradio_start failed\n");

	dev_info(&intf->dev, "coming out of suspend..\n");

	return 0;
}

/* File system interface */
static const struct v4l2_file_operations usb_amradio_fops = {
	.owner		= THIS_MODULE,
	.open		= usb_amradio_open,
	.release	= usb_amradio_close,
	.ioctl		= video_ioctl2,
};

static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = {
	.vidioc_querycap    = vidioc_querycap,
	.vidioc_g_tuner     = vidioc_g_tuner,
	.vidioc_s_tuner     = vidioc_s_tuner,
	.vidioc_g_frequency = vidioc_g_frequency,
	.vidioc_s_frequency = vidioc_s_frequency,
	.vidioc_queryctrl   = vidioc_queryctrl,
	.vidioc_g_ctrl      = vidioc_g_ctrl,
	.vidioc_s_ctrl      = vidioc_s_ctrl,
	.vidioc_g_audio     = vidioc_g_audio,
	.vidioc_s_audio     = vidioc_s_audio,
	.vidioc_g_input     = vidioc_g_input,
	.vidioc_s_input     = vidioc_s_input,
};

static void usb_amradio_device_release(struct video_device *videodev)
{
	struct amradio_device *radio = video_get_drvdata(videodev);

	/* we call v4l to free radio->videodev */
	video_device_release(videodev);

	/* free rest memory */
	kfree(radio->buffer);
	kfree(radio);
}

/* V4L2 interface */
static struct video_device amradio_videodev_template = {
	.name		= "AverMedia MR 800 USB FM Radio",
	.fops		= &usb_amradio_fops,
	.ioctl_ops 	= &usb_amradio_ioctl_ops,
	.release	= usb_amradio_device_release,
};

/* check if the device is present and register with v4l and usb if it is */
static int usb_amradio_probe(struct usb_interface *intf,
				const struct usb_device_id *id)
{
	struct amradio_device *radio;
	int retval;

	radio = kmalloc(sizeof(struct amradio_device), GFP_KERNEL);

	if (!radio) {
		dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
		return -ENOMEM;
	}

	radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);

	if (!radio->buffer) {
		dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
		kfree(radio);
		return -ENOMEM;
	}

	radio->videodev = video_device_alloc();

	if (!radio->videodev) {
		dev_err(&intf->dev, "video_device_alloc failed\n");
		kfree(radio->buffer);
		kfree(radio);
		return -ENOMEM;
	}

	memcpy(radio->videodev, &amradio_videodev_template,
		sizeof(amradio_videodev_template));

	radio->removed = 0;
	radio->users = 0;
	radio->usbdev = interface_to_usbdev(intf);
	radio->curfreq = 95.16 * FREQ_MUL;

	mutex_init(&radio->lock);

	video_set_drvdata(radio->videodev, radio);
	retval = video_register_device(radio->videodev,	VFL_TYPE_RADIO,	radio_nr);
	if (retval < 0) {
		dev_err(&intf->dev, "could not register video device\n");
		video_device_release(radio->videodev);
		kfree(radio->buffer);
		kfree(radio);
		return -EIO;
	}

	usb_set_intfdata(intf, radio);
	return 0;
}

static int __init amradio_init(void)
{
	int retval = usb_register(&usb_amradio_driver);

	pr_info(KBUILD_MODNAME
		": version " DRIVER_VERSION " " DRIVER_DESC "\n");

	if (retval)
		pr_err(KBUILD_MODNAME
			": usb_register failed. Error number %d\n", retval);

	return retval;
}

static void __exit amradio_exit(void)
{
	usb_deregister(&usb_amradio_driver);
}

module_init(amradio_init);
module_exit(amradio_exit);
Commit	Line	Data
2aa72f3b AK	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 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	* So, we have smth to begin with.
	34	*
	35	* History:
	36	* Version 0.01: First working version.
	37	* It's required to blacklist AverMedia USB Radio
	38	* in usbhid/hid-quirks.c
	39	*
	40	* Many things to do:
	41	* - Correct power managment of device (suspend & resume)
	42	* - Make x86 independance (little-endian and big-endian stuff)
	43	* - Add code for scanning and smooth tuning
	44	* - Checked and add stereo&mono stuff
	45	* - Add code for sensitivity value
	46	* - Correct mistakes
	47	* - In Japan another FREQ_MIN and FREQ_MAX
	48	*/
	49
	50	/* kernel includes */
	51	#include <linux/kernel.h>
	52	#include <linux/module.h>
	53	#include <linux/init.h>
	54	#include <linux/slab.h>
	55	#include <linux/input.h>
	56	#include <linux/videodev2.h>
	57	#include <media/v4l2-common.h>
	58	#include <media/v4l2-ioctl.h>
	59	#include <linux/usb.h>
	60	#include <linux/version.h> /* for KERNEL_VERSION MACRO */
	61
	62	/* driver and module definitions */
	63	#define DRIVER_AUTHOR "Alexey Klimov <klimov.linux@gmail.com>"
	64	#define DRIVER_DESC "AverMedia MR 800 USB FM radio driver"
65	#define DRIVER_VERSION "0.01"
66	#define RADIO_VERSION KERNEL_VERSION(0, 0, 1)
67
68	MODULE_AUTHOR(DRIVER_AUTHOR);
69	MODULE_DESCRIPTION(DRIVER_DESC);
70	MODULE_LICENSE("GPL");
71
72	#define USB_AMRADIO_VENDOR 0x07ca
73	#define USB_AMRADIO_PRODUCT 0xb800
74
e60b022e AK	75	/* dev_warn macro with driver name */
	76	#define MR800_DRIVER_NAME "radio-mr800"
	77	#define amradio_dev_warn(dev, fmt, arg...) \
	78	dev_warn(dev, MR800_DRIVER_NAME " - " fmt, ##arg)
	79
2aa72f3b AK	80	/* Probably USB_TIMEOUT should be modified in module parameter */
	81	#define BUFFER_LENGTH 8
	82	#define USB_TIMEOUT 500
	83
	84	/* Frequency limits in MHz -- these are European values. For Japanese
	85	devices, that would be 76 and 91. */
	86	#define FREQ_MIN 87.5
	87	#define FREQ_MAX 108.0
	88	#define FREQ_MUL 16000
	89
	90	/* module parameter */
	91	static int radio_nr = -1;
	92	module_param(radio_nr, int, 0);
	93	MODULE_PARM_DESC(radio_nr, "Radio Nr");
	94
	95	static struct v4l2_queryctrl radio_qctrl[] = {
	96	{
	97	.id = V4L2_CID_AUDIO_MUTE,
	98	.name = "Mute",
	99	.minimum = 0,
	100	.maximum = 1,
	101	.step = 1,
	102	.default_value = 1,
	103	.type = V4L2_CTRL_TYPE_BOOLEAN,
	104	},
	105	/* HINT: the disabled controls are only here to satify kradio and such apps */
	106	{ .id = V4L2_CID_AUDIO_VOLUME,
	107	.flags = V4L2_CTRL_FLAG_DISABLED,
	108	},
	109	{
	110	.id = V4L2_CID_AUDIO_BALANCE,
	111	.flags = V4L2_CTRL_FLAG_DISABLED,
	112	},
	113	{
	114	.id = V4L2_CID_AUDIO_BASS,
	115	.flags = V4L2_CTRL_FLAG_DISABLED,
	116	},
	117	{
	118	.id = V4L2_CID_AUDIO_TREBLE,
	119	.flags = V4L2_CTRL_FLAG_DISABLED,
	120	},
	121	{
	122	.id = V4L2_CID_AUDIO_LOUDNESS,
	123	.flags = V4L2_CTRL_FLAG_DISABLED,
	124	},
	125	};
	126
	127	static int usb_amradio_probe(struct usb_interface *intf,
	128	const struct usb_device_id *id);
	129	static void usb_amradio_disconnect(struct usb_interface *intf);
bec43661 HV	130	static int usb_amradio_open(struct file *file);
bec43661 HV	131	static int usb_amradio_close(struct file *file);
2aa72f3b AK	132	static int usb_amradio_suspend(struct usb_interface *intf,
	133	pm_message_t message);
	134	static int usb_amradio_resume(struct usb_interface *intf);
	135
	136	/* Data for one (physical) device */
	137	struct amradio_device {
	138	/* reference to USB and video device */
	139	struct usb_device *usbdev;
	140	struct video_device *videodev;
	141
	142	unsigned char *buffer;
	143	struct mutex lock; /* buffer locking */
	144	int curfreq;
	145	int stereo;
	146	int users;
	147	int removed;
	148	int muted;
	149	};
	150
	151	/* USB Device ID List */
	152	static struct usb_device_id usb_amradio_device_table[] = {
	153	{USB_DEVICE_AND_INTERFACE_INFO(USB_AMRADIO_VENDOR, USB_AMRADIO_PRODUCT,
	154	USB_CLASS_HID, 0, 0) },
	155	{ } /* Terminating entry */
	156	};
	157
	158	MODULE_DEVICE_TABLE(usb, usb_amradio_device_table);
	159
	160	/* USB subsystem interface */
	161	static struct usb_driver usb_amradio_driver = {
e60b022e	162	.name = MR800_DRIVER_NAME,
2aa72f3b AK	163	.probe = usb_amradio_probe,
	164	.disconnect = usb_amradio_disconnect,
	165	.suspend = usb_amradio_suspend,
	166	.resume = usb_amradio_resume,
	167	.reset_resume = usb_amradio_resume,
	168	.id_table = usb_amradio_device_table,
f2ce9179	169	.supports_autosuspend = 0,
2aa72f3b AK	170	};
	171
	172	/* switch on radio. Send 8 bytes to device. */
	173	static int amradio_start(struct amradio_device *radio)
	174	{
	175	int retval;
	176	int size;
	177
	178	mutex_lock(&radio->lock);
	179
	180	radio->buffer[0] = 0x00;
	181	radio->buffer[1] = 0x55;
	182	radio->buffer[2] = 0xaa;
	183	radio->buffer[3] = 0x00;
	184	radio->buffer[4] = 0xab;
	185	radio->buffer[5] = 0x00;
	186	radio->buffer[6] = 0x00;
	187	radio->buffer[7] = 0x00;
	188
	189	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
	190	(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
	191
	192	if (retval) {
	193	mutex_unlock(&radio->lock);
	194	return retval;
	195	}
	196
2aa72f3b AK	197	radio->muted = 0;
2aa72f3b AK	198
7f03a585 AK	199	mutex_unlock(&radio->lock);
7f03a585 AK	200
2aa72f3b AK	201	return retval;
	202	}
	203
	204	/* switch off radio */
	205	static int amradio_stop(struct amradio_device *radio)
	206	{
	207	int retval;
	208	int size;
	209
3480130a AK	210	/* safety check */
	211	if (radio->removed)
	212	return -EIO;
	213
2aa72f3b AK	214	mutex_lock(&radio->lock);
	215
	216	radio->buffer[0] = 0x00;
	217	radio->buffer[1] = 0x55;
	218	radio->buffer[2] = 0xaa;
	219	radio->buffer[3] = 0x00;
	220	radio->buffer[4] = 0xab;
	221	radio->buffer[5] = 0x01;
	222	radio->buffer[6] = 0x00;
	223	radio->buffer[7] = 0x00;
	224
	225	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
	226	(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
	227
	228	if (retval) {
	229	mutex_unlock(&radio->lock);
	230	return retval;
	231	}
	232
2aa72f3b AK	233	radio->muted = 1;
2aa72f3b AK	234
7f03a585 AK	235	mutex_unlock(&radio->lock);
7f03a585 AK	236
2aa72f3b AK	237	return retval;
	238	}
	239
	240	/* set a frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
	241	static int amradio_setfreq(struct amradio_device *radio, int freq)
	242	{
	243	int retval;
	244	int size;
	245	unsigned short freq_send = 0x13 + (freq >> 3) / 25;
	246
3480130a AK	247	/* safety check */
	248	if (radio->removed)
	249	return -EIO;
	250
2aa72f3b AK	251	mutex_lock(&radio->lock);
	252
	253	radio->buffer[0] = 0x00;
	254	radio->buffer[1] = 0x55;
	255	radio->buffer[2] = 0xaa;
	256	radio->buffer[3] = 0x03;
	257	radio->buffer[4] = 0xa4;
	258	radio->buffer[5] = 0x00;
	259	radio->buffer[6] = 0x00;
	260	radio->buffer[7] = 0x08;
	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) {
	266	mutex_unlock(&radio->lock);
	267	return retval;
	268	}
	269
	270	/* frequency is calculated from freq_send and placed in first 2 bytes */
	271	radio->buffer[0] = (freq_send >> 8) & 0xff;
	272	radio->buffer[1] = freq_send & 0xff;
	273	radio->buffer[2] = 0x01;
	274	radio->buffer[3] = 0x00;
	275	radio->buffer[4] = 0x00;
	276	/* 5 and 6 bytes of buffer already = 0x00 */
	277	radio->buffer[7] = 0x00;
	278
	279	retval = usb_bulk_msg(radio->usbdev, usb_sndintpipe(radio->usbdev, 2),
	280	(void *) (radio->buffer), BUFFER_LENGTH, &size, USB_TIMEOUT);
	281
	282	if (retval) {
	283	mutex_unlock(&radio->lock);
	284	return retval;
	285	}
	286
2aa72f3b AK	287	radio->stereo = 0;
2aa72f3b AK	288
7f03a585 AK	289	mutex_unlock(&radio->lock);
7f03a585 AK	290
2aa72f3b AK	291	return retval;
	292	}
	293
	294	/* USB subsystem interface begins here */
	295
	296	/* handle unplugging of the device, release data structures
	297	if nothing keeps us from doing it. If something is still
	298	keeping us busy, the release callback of v4l will take care
	299	of releasing it. */
	300	static void usb_amradio_disconnect(struct usb_interface *intf)
	301	{
	302	struct amradio_device *radio = usb_get_intfdata(intf);
	303
f4e9043e	304	mutex_lock(&radio->lock);
3480130a	305	radio->removed = 1;
f4e9043e	306	mutex_unlock(&radio->lock);
2aa72f3b	307
f4e9043e AK	308	usb_set_intfdata(intf, NULL);
f4e9043e AK	309	video_unregister_device(radio->videodev);
2aa72f3b AK	310	}
	311
	312	/* vidioc_querycap - query device capabilities */
	313	static int vidioc_querycap(struct file file, void priv,
	314	struct v4l2_capability *v)
	315	{
c7181cfa AK	316	struct amradio_device *radio = video_drvdata(file);
c7181cfa AK	317
2aa72f3b AK	318	strlcpy(v->driver, "radio-mr800", sizeof(v->driver));
2aa72f3b AK	319	strlcpy(v->card, "AverMedia MR 800 USB FM Radio", sizeof(v->card));
c7181cfa	320	usb_make_path(radio->usbdev, v->bus_info, sizeof(v->bus_info));
2aa72f3b AK	321	v->version = RADIO_VERSION;
	322	v->capabilities = V4L2_CAP_TUNER;
	323	return 0;
	324	}
	325
	326	/* vidioc_g_tuner - get tuner attributes */
	327	static int vidioc_g_tuner(struct file file, void priv,
	328	struct v4l2_tuner *v)
	329	{
	330	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
	331
3480130a AK	332	/* safety check */
	333	if (radio->removed)
	334	return -EIO;
	335
2aa72f3b AK	336	if (v->index > 0)
	337	return -EINVAL;
	338
	339	/* TODO: Add function which look is signal stereo or not
	340	* amradio_getstat(radio);
	341	*/
	342	radio->stereo = -1;
	343	strcpy(v->name, "FM");
	344	v->type = V4L2_TUNER_RADIO;
	345	v->rangelow = FREQ_MIN * FREQ_MUL;
	346	v->rangehigh = FREQ_MAX * FREQ_MUL;
	347	v->rxsubchans = V4L2_TUNER_SUB_MONO \| V4L2_TUNER_SUB_STEREO;
	348	v->capability = V4L2_TUNER_CAP_LOW;
	349	if (radio->stereo)
	350	v->audmode = V4L2_TUNER_MODE_STEREO;
	351	else
	352	v->audmode = V4L2_TUNER_MODE_MONO;
	353	v->signal = 0xffff; /* Can't get the signal strength, sad.. */
	354	v->afc = 0; /* Don't know what is this */
	355	return 0;
	356	}
	357
	358	/* vidioc_s_tuner - set tuner attributes */
	359	static int vidioc_s_tuner(struct file file, void priv,
	360	struct v4l2_tuner *v)
	361	{
3480130a AK	362	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
	363
	364	/* safety check */
	365	if (radio->removed)
	366	return -EIO;
	367
2aa72f3b AK	368	if (v->index > 0)
	369	return -EINVAL;
	370	return 0;
	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 = video_get_drvdata(video_devdata(file));
a5d69475	378	int retval;
2aa72f3b	379
3480130a AK	380	/* safety check */
	381	if (radio->removed)
	382	return -EIO;
	383
2aa72f3b	384	radio->curfreq = f->frequency;
a5d69475 AK	385	retval = amradio_setfreq(radio, radio->curfreq);
a5d69475 AK	386	if (retval < 0)
e60b022e AK	387	amradio_dev_warn(&radio->videodev->dev,
e60b022e AK	388	"set frequency failed\n");
2aa72f3b AK	389	return 0;
	390	}
	391
	392	/* vidioc_g_frequency - get tuner radio frequency */
	393	static int vidioc_g_frequency(struct file file, void priv,
	394	struct v4l2_frequency *f)
	395	{
	396	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
	397
3480130a AK	398	/* safety check */
	399	if (radio->removed)
	400	return -EIO;
	401
2aa72f3b AK	402	f->type = V4L2_TUNER_RADIO;
	403	f->frequency = radio->curfreq;
	404	return 0;
	405	}
	406
	407	/* vidioc_queryctrl - enumerate control items */
	408	static int vidioc_queryctrl(struct file file, void priv,
	409	struct v4l2_queryctrl *qc)
	410	{
	411	int i;
	412
	413	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
	414	if (qc->id && qc->id == radio_qctrl[i].id) {
e60b022e	415	memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
2aa72f3b AK	416	return 0;
	417	}
	418	}
	419	return -EINVAL;
	420	}
	421
	422	/* vidioc_g_ctrl - get the value of a control */
	423	static int vidioc_g_ctrl(struct file file, void priv,
	424	struct v4l2_control *ctrl)
	425	{
	426	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
	427
3480130a AK	428	/* safety check */
	429	if (radio->removed)
	430	return -EIO;
	431
2aa72f3b AK	432	switch (ctrl->id) {
	433	case V4L2_CID_AUDIO_MUTE:
	434	ctrl->value = radio->muted;
	435	return 0;
	436	}
	437	return -EINVAL;
	438	}
	439
	440	/* vidioc_s_ctrl - set the value of a control */
	441	static int vidioc_s_ctrl(struct file file, void priv,
	442	struct v4l2_control *ctrl)
	443	{
	444	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
a5d69475	445	int retval;
2aa72f3b	446
3480130a AK	447	/* safety check */
	448	if (radio->removed)
	449	return -EIO;
	450
2aa72f3b AK	451	switch (ctrl->id) {
	452	case V4L2_CID_AUDIO_MUTE:
	453	if (ctrl->value) {
a5d69475 AK	454	retval = amradio_stop(radio);
a5d69475 AK	455	if (retval < 0) {
e60b022e AK	456	amradio_dev_warn(&radio->videodev->dev,
e60b022e AK	457	"amradio_stop failed\n");
2aa72f3b AK	458	return -1;
	459	}
	460	} else {
a5d69475 AK	461	retval = amradio_start(radio);
a5d69475 AK	462	if (retval < 0) {
e60b022e AK	463	amradio_dev_warn(&radio->videodev->dev,
e60b022e AK	464	"amradio_start failed\n");
2aa72f3b AK	465	return -1;
	466	}
	467	}
	468	return 0;
	469	}
	470	return -EINVAL;
	471	}
	472
	473	/* vidioc_g_audio - get audio attributes */
	474	static int vidioc_g_audio(struct file file, void priv,
	475	struct v4l2_audio *a)
	476	{
	477	if (a->index > 1)
	478	return -EINVAL;
	479
	480	strcpy(a->name, "Radio");
	481	a->capability = V4L2_AUDCAP_STEREO;
	482	return 0;
	483	}
	484
	485	/* vidioc_s_audio - set audio attributes */
	486	static int vidioc_s_audio(struct file file, void priv,
	487	struct v4l2_audio *a)
	488	{
	489	if (a->index != 0)
	490	return -EINVAL;
	491	return 0;
	492	}
	493
	494	/* vidioc_g_input - get input */
	495	static int vidioc_g_input(struct file filp, void priv, unsigned int *i)
	496	{
	497	*i = 0;
	498	return 0;
	499	}
	500
	501	/* vidioc_s_input - set input */
	502	static int vidioc_s_input(struct file filp, void priv, unsigned int i)
	503	{
	504	if (i != 0)
	505	return -EINVAL;
	506	return 0;
	507	}
	508
	509	/* open device - amradio_start() and amradio_setfreq() */
bec43661	510	static int usb_amradio_open(struct file *file)
2aa72f3b AK	511	{
2aa72f3b AK	512	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
a5d69475	513	int retval;
2aa72f3b	514
0fabb783 AK	515	lock_kernel();
0fabb783 AK	516
2aa72f3b AK	517	radio->users = 1;
	518	radio->muted = 1;
	519
a5d69475 AK	520	retval = amradio_start(radio);
a5d69475 AK	521	if (retval < 0) {
e60b022e AK	522	amradio_dev_warn(&radio->videodev->dev,
e60b022e AK	523	"radio did not start up properly\n");
2aa72f3b	524	radio->users = 0;
0fabb783	525	unlock_kernel();
2aa72f3b AK	526	return -EIO;
2aa72f3b AK	527	}
a5d69475 AK	528
	529	retval = amradio_setfreq(radio, radio->curfreq);
	530	if (retval < 0)
e60b022e AK	531	amradio_dev_warn(&radio->videodev->dev,
e60b022e AK	532	"set frequency failed\n");
0fabb783 AK	533
0fabb783 AK	534	unlock_kernel();
2aa72f3b AK	535	return 0;
	536	}
	537
f4e9043e	538	/close device /
bec43661	539	static int usb_amradio_close(struct file *file)
2aa72f3b AK	540	{
2aa72f3b AK	541	struct amradio_device *radio = video_get_drvdata(video_devdata(file));
3480130a	542	int retval;
2aa72f3b AK	543
	544	if (!radio)
	545	return -ENODEV;
3480130a	546
2aa72f3b	547	radio->users = 0;
3480130a	548
f4e9043e	549	if (!radio->removed) {
3480130a AK	550	retval = amradio_stop(radio);
	551	if (retval < 0)
	552	amradio_dev_warn(&radio->videodev->dev,
	553	"amradio_stop failed\n");
2aa72f3b	554	}
3480130a	555
2aa72f3b AK	556	return 0;
	557	}
	558
	559	/* Suspend device - stop device. Need to be checked and fixed */
	560	static int usb_amradio_suspend(struct usb_interface *intf, pm_message_t message)
	561	{
	562	struct amradio_device *radio = usb_get_intfdata(intf);
a5d69475	563	int retval;
2aa72f3b	564
a5d69475 AK	565	retval = amradio_stop(radio);
a5d69475 AK	566	if (retval < 0)
e60b022e	567	dev_warn(&intf->dev, "amradio_stop failed\n");
2aa72f3b	568
e60b022e	569	dev_info(&intf->dev, "going into suspend..\n");
2aa72f3b AK	570
	571	return 0;
	572	}
	573
	574	/* Resume device - start device. Need to be checked and fixed */
	575	static int usb_amradio_resume(struct usb_interface *intf)
	576	{
	577	struct amradio_device *radio = usb_get_intfdata(intf);
a5d69475	578	int retval;
2aa72f3b	579
a5d69475 AK	580	retval = amradio_start(radio);
a5d69475 AK	581	if (retval < 0)
e60b022e	582	dev_warn(&intf->dev, "amradio_start failed\n");
2aa72f3b	583
e60b022e	584	dev_info(&intf->dev, "coming out of suspend..\n");
2aa72f3b AK	585
	586	return 0;
	587	}
	588
	589	/* File system interface */
bec43661	590	static const struct v4l2_file_operations usb_amradio_fops = {
2aa72f3b AK	591	.owner = THIS_MODULE,
	592	.open = usb_amradio_open,
	593	.release = usb_amradio_close,
	594	.ioctl = video_ioctl2,
2aa72f3b AK	595	};
	596
	597	static const struct v4l2_ioctl_ops usb_amradio_ioctl_ops = {
	598	.vidioc_querycap = vidioc_querycap,
	599	.vidioc_g_tuner = vidioc_g_tuner,
	600	.vidioc_s_tuner = vidioc_s_tuner,
	601	.vidioc_g_frequency = vidioc_g_frequency,
	602	.vidioc_s_frequency = vidioc_s_frequency,
	603	.vidioc_queryctrl = vidioc_queryctrl,
	604	.vidioc_g_ctrl = vidioc_g_ctrl,
	605	.vidioc_s_ctrl = vidioc_s_ctrl,
	606	.vidioc_g_audio = vidioc_g_audio,
	607	.vidioc_s_audio = vidioc_s_audio,
	608	.vidioc_g_input = vidioc_g_input,
	609	.vidioc_s_input = vidioc_s_input,
	610	};
	611
f4e9043e AK	612	static void usb_amradio_device_release(struct video_device *videodev)
	613	{
	614	struct amradio_device *radio = video_get_drvdata(videodev);
	615
	616	/* we call v4l to free radio->videodev */
	617	video_device_release(videodev);
	618
	619	/* free rest memory */
	620	kfree(radio->buffer);
	621	kfree(radio);
	622	}
	623
2aa72f3b AK	624	/* V4L2 interface */
	625	static struct video_device amradio_videodev_template = {
	626	.name = "AverMedia MR 800 USB FM Radio",
	627	.fops = &usb_amradio_fops,
	628	.ioctl_ops = &usb_amradio_ioctl_ops,
f4e9043e	629	.release = usb_amradio_device_release,
2aa72f3b AK	630	};
2aa72f3b AK	631
a5d69475	632	/* check if the device is present and register with v4l and usb if it is */
2aa72f3b AK	633	static int usb_amradio_probe(struct usb_interface *intf,
	634	const struct usb_device_id *id)
	635	{
	636	struct amradio_device *radio;
a5d69475	637	int retval;
2aa72f3b AK	638
	639	radio = kmalloc(sizeof(struct amradio_device), GFP_KERNEL);
	640
8edafcc6 AK	641	if (!radio) {
8edafcc6 AK	642	dev_err(&intf->dev, "kmalloc for amradio_device failed\n");
2aa72f3b	643	return -ENOMEM;
8edafcc6	644	}
2aa72f3b AK	645
	646	radio->buffer = kmalloc(BUFFER_LENGTH, GFP_KERNEL);
	647
8edafcc6 AK	648	if (!radio->buffer) {
8edafcc6 AK	649	dev_err(&intf->dev, "kmalloc for radio->buffer failed\n");
2aa72f3b AK	650	kfree(radio);
	651	return -ENOMEM;
	652	}
	653
	654	radio->videodev = video_device_alloc();
	655
8edafcc6 AK	656	if (!radio->videodev) {
8edafcc6 AK	657	dev_err(&intf->dev, "video_device_alloc failed\n");
2aa72f3b AK	658	kfree(radio->buffer);
	659	kfree(radio);
	660	return -ENOMEM;
	661	}
	662
	663	memcpy(radio->videodev, &amradio_videodev_template,
	664	sizeof(amradio_videodev_template));
	665
	666	radio->removed = 0;
	667	radio->users = 0;
	668	radio->usbdev = interface_to_usbdev(intf);
	669	radio->curfreq = 95.16 * FREQ_MUL;
	670
	671	mutex_init(&radio->lock);
	672
	673	video_set_drvdata(radio->videodev, radio);
a5d69475 AK	674	retval = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr);
a5d69475 AK	675	if (retval < 0) {
65c51dc9	676	dev_err(&intf->dev, "could not register video device\n");
2aa72f3b AK	677	video_device_release(radio->videodev);
	678	kfree(radio->buffer);
	679	kfree(radio);
	680	return -EIO;
	681	}
	682
	683	usb_set_intfdata(intf, radio);
	684	return 0;
	685	}
	686
	687	static int __init amradio_init(void)
	688	{
	689	int retval = usb_register(&usb_amradio_driver);
	690
e60b022e AK	691	pr_info(KBUILD_MODNAME
	692	": version " DRIVER_VERSION " " DRIVER_DESC "\n");
	693
2aa72f3b	694	if (retval)
e60b022e AK	695	pr_err(KBUILD_MODNAME
	696	": usb_register failed. Error number %d\n", retval);
	697
2aa72f3b AK	698	return retval;
	699	}
	700
	701	static void __exit amradio_exit(void)
	702	{
	703	usb_deregister(&usb_amradio_driver);
	704	}
	705
	706	module_init(amradio_init);
	707	module_exit(amradio_exit);
	708