drivers/media/radio/radio-typhoon.c - maze/linux - Git at Google

 /* Typhoon Radio Card driver for radio support
  * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
  *
  * Card manufacturer:
  * http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e
  *
  * Notes on the hardware
  *
  * This card has two output sockets, one for speakers and one for line.
  * The speaker output has volume control, but only in four discrete
  * steps. The line output has neither volume control nor mute.
  *
  * The card has auto-stereo according to its manual, although it all
  * sounds mono to me (even with the Win/DOS drivers). Maybe it's my
  * antenna - I really don't know for sure.
  *
  * Frequency control is done digitally.
  *
  * Volume control is done digitally, but there are only four different
  * possible values. So you should better always turn the volume up and
  * use line control. I got the best results by connecting line output
  * to the sound card microphone input. For such a configuration the
  * volume control has no effect, since volume control only influences
  * the speaker output.
  *
  * There is no explicit mute/unmute. So I set the radio frequency to a
  * value where I do expect just noise and turn the speaker volume down.
  * The frequency change is necessary since the card never seems to be
  * completely silent.
  *
  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  */

 #include <linux/module.h>	/* Modules                        */
 #include <linux/init.h>		/* Initdata                       */
 #include <linux/ioport.h>	/* request_region		  */
 #include <linux/proc_fs.h>	/* radio card status report	  */
 #include <linux/seq_file.h>
 #include <asm/io.h>		/* outb, outb_p                   */
 #include <asm/uaccess.h>	/* copy to/from user              */
 #include <linux/videodev2.h>	/* kernel radio structs           */
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>

 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
 #define RADIO_VERSION KERNEL_VERSION(0,1,1)
 #define BANNER "Typhoon Radio Card driver v0.1.1\n"

 static struct v4l2_queryctrl radio_qctrl[] = {
 	{
 		.id            = V4L2_CID_AUDIO_MUTE,
 		.name          = "Mute",
 		.minimum       = 0,
 		.maximum       = 1,
 		.default_value = 1,
 		.type          = V4L2_CTRL_TYPE_BOOLEAN,
 	},{
 		.id            = V4L2_CID_AUDIO_VOLUME,
 		.name          = "Volume",
 		.minimum       = 0,
 		.maximum       = 65535,
 		.step          = 1<<14,
 		.default_value = 0xff,
 		.type          = V4L2_CTRL_TYPE_INTEGER,
 	}
 };


 #ifndef CONFIG_RADIO_TYPHOON_PORT
 #define CONFIG_RADIO_TYPHOON_PORT -1
 #endif

 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
 #endif

 #ifndef CONFIG_PROC_FS
 #undef CONFIG_RADIO_TYPHOON_PROC_FS
 #endif

 struct typhoon_device {
 	int users;
 	int iobase;
 	int curvol;
 	int muted;
 	unsigned long curfreq;
 	unsigned long mutefreq;
 	struct mutex lock;
 };

 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
 static int typhoon_setfreq_generic(struct typhoon_device *dev,
 				   unsigned long frequency);
 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
 static void typhoon_mute(struct typhoon_device *dev);
 static void typhoon_unmute(struct typhoon_device *dev);
 static int typhoon_setvol(struct typhoon_device *dev, int vol);

 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
 {
 	mutex_lock(&dev->lock);
 	vol >>= 14;				/* Map 16 bit to 2 bit */
 	vol &= 3;
 	outb_p(vol / 2, dev->iobase);		/* Set the volume, high bit. */
 	outb_p(vol % 2, dev->iobase + 2);	/* Set the volume, low bit. */
 	mutex_unlock(&dev->lock);
 }

 static int typhoon_setfreq_generic(struct typhoon_device *dev,
 				   unsigned long frequency)
 {
 	unsigned long outval;
 	unsigned long x;

 	/*
 	 * The frequency transfer curve is not linear. The best fit I could
 	 * get is
 	 *
 	 * outval = -155 + exp((f + 15.55) * 0.057))
 	 *
 	 * where frequency f is in MHz. Since we don't have exp in the kernel,
 	 * I approximate this function by a third order polynomial.
 	 *
 	 */

 	mutex_lock(&dev->lock);
 	x = frequency / 160;
 	outval = (x * x + 2500) / 5000;
 	outval = (outval * x + 5000) / 10000;
 	outval -= (10 * x * x + 10433) / 20866;
 	outval += 4 * x - 11505;

 	outb_p((outval >> 8) & 0x01, dev->iobase + 4);
 	outb_p(outval >> 9, dev->iobase + 6);
 	outb_p(outval & 0xff, dev->iobase + 8);
 	mutex_unlock(&dev->lock);

 	return 0;
 }

 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
 {
 	typhoon_setfreq_generic(dev, frequency);
 	dev->curfreq = frequency;
 	return 0;
 }

 static void typhoon_mute(struct typhoon_device *dev)
 {
 	if (dev->muted == 1)
 		return;
 	typhoon_setvol_generic(dev, 0);
 	typhoon_setfreq_generic(dev, dev->mutefreq);
 	dev->muted = 1;
 }

 static void typhoon_unmute(struct typhoon_device *dev)
 {
 	if (dev->muted == 0)
 		return;
 	typhoon_setfreq_generic(dev, dev->curfreq);
 	typhoon_setvol_generic(dev, dev->curvol);
 	dev->muted = 0;
 }

 static int typhoon_setvol(struct typhoon_device *dev, int vol)
 {
 	if (dev->muted && vol != 0) {	/* user is unmuting the card */
 		dev->curvol = vol;
 		typhoon_unmute(dev);
 		return 0;
 	}
 	if (vol == dev->curvol)		/* requested volume == current */
 		return 0;

 	if (vol == 0) {			/* volume == 0 means mute the card */
 		typhoon_mute(dev);
 		dev->curvol = vol;
 		return 0;
 	}
 	typhoon_setvol_generic(dev, vol);
 	dev->curvol = vol;
 	return 0;
 }

 static int vidioc_querycap(struct file *file, void  *priv,
 					struct v4l2_capability *v)
 {
 	strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
 	strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
 	sprintf(v->bus_info, "ISA");
 	v->version = RADIO_VERSION;
 	v->capabilities = V4L2_CAP_TUNER;
 	return 0;
 }

 static int vidioc_g_tuner(struct file *file, void *priv,
 					struct v4l2_tuner *v)
 {
 	if (v->index > 0)
 		return -EINVAL;

 	strcpy(v->name, "FM");
 	v->type = V4L2_TUNER_RADIO;
 	v->rangelow = (87.5*16000);
 	v->rangehigh = (108*16000);
 	v->rxsubchans = V4L2_TUNER_SUB_MONO;
 	v->capability = V4L2_TUNER_CAP_LOW;
 	v->audmode = V4L2_TUNER_MODE_MONO;
 	v->signal = 0xFFFF;     /* We can't get the signal strength */
 	return 0;
 }

 static int vidioc_s_tuner(struct file *file, void *priv,
 					struct v4l2_tuner *v)
 {
 	if (v->index > 0)
 		return -EINVAL;

 	return 0;
 }

 static int vidioc_s_frequency(struct file *file, void *priv,
 					struct v4l2_frequency *f)
 {
 	struct video_device *dev = video_devdata(file);
 	struct typhoon_device *typhoon = dev->priv;

 	typhoon->curfreq = f->frequency;
 	typhoon_setfreq(typhoon, typhoon->curfreq);
 	return 0;
 }

 static int vidioc_g_frequency(struct file *file, void *priv,
 					struct v4l2_frequency *f)
 {
 	struct video_device *dev = video_devdata(file);
 	struct typhoon_device *typhoon = dev->priv;

 	f->type = V4L2_TUNER_RADIO;
 	f->frequency = typhoon->curfreq;

 	return 0;
 }

 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;
 }

 static int vidioc_g_ctrl(struct file *file, void *priv,
 					struct v4l2_control *ctrl)
 {
 	struct video_device *dev = video_devdata(file);
 	struct typhoon_device *typhoon = dev->priv;

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		ctrl->value = typhoon->muted;
 		return 0;
 	case V4L2_CID_AUDIO_VOLUME:
 		ctrl->value = typhoon->curvol;
 		return 0;
 	}
 	return -EINVAL;
 }

 static int vidioc_s_ctrl (struct file *file, void *priv,
 					struct v4l2_control *ctrl)
 {
 	struct video_device *dev = video_devdata(file);
 	struct typhoon_device *typhoon = dev->priv;

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		if (ctrl->value)
 			typhoon_mute(typhoon);
 		else
 			typhoon_unmute(typhoon);
 		return 0;
 	case V4L2_CID_AUDIO_VOLUME:
 		typhoon_setvol(typhoon, ctrl->value);
 		return 0;
 	}
 	return -EINVAL;
 }

 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;
 }

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

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

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

 static struct typhoon_device typhoon_unit =
 {
 	.iobase		= CONFIG_RADIO_TYPHOON_PORT,
 	.curfreq	= CONFIG_RADIO_TYPHOON_MUTEFREQ,
 	.mutefreq	= CONFIG_RADIO_TYPHOON_MUTEFREQ,
 };

 static const struct file_operations typhoon_fops = {
 	.owner		= THIS_MODULE,
 	.open           = video_exclusive_open,
 	.release        = video_exclusive_release,
 	.ioctl		= video_ioctl2,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= v4l_compat_ioctl32,
 #endif
 	.llseek         = no_llseek,
 };

 static const struct v4l2_ioctl_ops typhoon_ioctl_ops = {
 	.vidioc_querycap    = vidioc_querycap,
 	.vidioc_g_tuner     = vidioc_g_tuner,
 	.vidioc_s_tuner     = vidioc_s_tuner,
 	.vidioc_g_audio     = vidioc_g_audio,
 	.vidioc_s_audio     = vidioc_s_audio,
 	.vidioc_g_input     = vidioc_g_input,
 	.vidioc_s_input     = vidioc_s_input,
 	.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,
 };

 static struct video_device typhoon_radio = {
 	.name		= "Typhoon Radio",
 	.fops           = &typhoon_fops,
 	.ioctl_ops 	= &typhoon_ioctl_ops,
 };

 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS

 static int typhoon_proc_show(struct seq_file *m, void *v)
 {
 	#ifdef MODULE
 	    #define MODULEPROCSTRING "Driver loaded as a module"
 	#else
 	    #define MODULEPROCSTRING "Driver compiled into kernel"
 	#endif

 	seq_puts(m, BANNER);
 	seq_puts(m, "Load type: " MODULEPROCSTRING "\n\n");
 	seq_printf(m, "frequency = %lu kHz\n",
 		typhoon_unit.curfreq >> 4);
 	seq_printf(m, "volume = %d\n", typhoon_unit.curvol);
 	seq_printf(m, "mute = %s\n", typhoon_unit.muted ?
 		"on" : "off");
 	seq_printf(m, "iobase = 0x%x\n", typhoon_unit.iobase);
 	seq_printf(m, "mute frequency = %lu kHz\n",
 		typhoon_unit.mutefreq >> 4);
 	return 0;
 }

 static int typhoon_proc_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, typhoon_proc_show, NULL);
 }

 static const struct file_operations typhoon_proc_fops = {
 	.owner		= THIS_MODULE,
 	.open		= typhoon_proc_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= single_release,
 };
 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */

 MODULE_AUTHOR("Dr. Henrik Seidel");
 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
 MODULE_LICENSE("GPL");

 static int io = -1;
 static int radio_nr = -1;

 module_param(io, int, 0);
 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
 module_param(radio_nr, int, 0);

 #ifdef MODULE
 static unsigned long mutefreq;
 module_param(mutefreq, ulong, 0);
 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
 #endif

 static int __init typhoon_init(void)
 {
 #ifdef MODULE
 	if (io == -1) {
 		printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
 		return -EINVAL;
 	}
 	typhoon_unit.iobase = io;

 	if (mutefreq < 87000 || mutefreq > 108500) {
 		printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
 		printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
 		return -EINVAL;
 	}
 	typhoon_unit.mutefreq = mutefreq;
 #endif /* MODULE */

 	printk(KERN_INFO BANNER);
 	mutex_init(&typhoon_unit.lock);
 	io = typhoon_unit.iobase;
 	if (!request_region(io, 8, "typhoon")) {
 		printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
 		       typhoon_unit.iobase);
 		return -EBUSY;
 	}

 	typhoon_radio.priv = &typhoon_unit;
 	if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1)
 	{
 		release_region(io, 8);
 		return -EINVAL;
 	}
 	printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
 	printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
 	       typhoon_unit.mutefreq);
 	typhoon_unit.mutefreq <<= 4;

 	/* mute card - prevents noisy bootups */
 	typhoon_mute(&typhoon_unit);

 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
 	if (!proc_create("driver/radio-typhoon", 0, NULL, &typhoon_proc_fops))
 		printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
 #endif

 	return 0;
 }

 static void __exit typhoon_cleanup_module(void)
 {

 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
 	remove_proc_entry("driver/radio-typhoon", NULL);
 #endif

 	video_unregister_device(&typhoon_radio);
 	release_region(io, 8);
 }

 module_init(typhoon_init);
 module_exit(typhoon_cleanup_module);
	/* Typhoon Radio Card driver for radio support
	* (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
	*
	* Card manufacturer:
	* http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e
	*
	* Notes on the hardware
	*
	* This card has two output sockets, one for speakers and one for line.
	* The speaker output has volume control, but only in four discrete
	* steps. The line output has neither volume control nor mute.
	*
	* The card has auto-stereo according to its manual, although it all
	* sounds mono to me (even with the Win/DOS drivers). Maybe it's my
	* antenna - I really don't know for sure.
	*
	* Frequency control is done digitally.
	*
	* Volume control is done digitally, but there are only four different
	* possible values. So you should better always turn the volume up and
	* use line control. I got the best results by connecting line output
	* to the sound card microphone input. For such a configuration the
	* volume control has no effect, since volume control only influences
	* the speaker output.
	*
	* There is no explicit mute/unmute. So I set the radio frequency to a
	* value where I do expect just noise and turn the speaker volume down.
	* The frequency change is necessary since the card never seems to be
	* completely silent.
	*
	* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
	*/

	#include <linux/module.h> /* Modules */
	#include <linux/init.h> /* Initdata */
	#include <linux/ioport.h> /* request_region */
	#include <linux/proc_fs.h> /* radio card status report */
	#include <linux/seq_file.h>
	#include <asm/io.h> /* outb, outb_p */
	#include <asm/uaccess.h> /* copy to/from user */
	#include <linux/videodev2.h> /* kernel radio structs */
	#include <media/v4l2-common.h>
	#include <media/v4l2-ioctl.h>

	#include <linux/version.h> /* for KERNEL_VERSION MACRO */
	#define RADIO_VERSION KERNEL_VERSION(0,1,1)
	#define BANNER "Typhoon Radio Card driver v0.1.1\n"

	static struct v4l2_queryctrl radio_qctrl[] = {
	{
	.id = V4L2_CID_AUDIO_MUTE,
	.name = "Mute",
	.minimum = 0,
	.maximum = 1,
	.default_value = 1,
	.type = V4L2_CTRL_TYPE_BOOLEAN,
	},{
	.id = V4L2_CID_AUDIO_VOLUME,
	.name = "Volume",
	.minimum = 0,
	.maximum = 65535,
	.step = 1<<14,
	.default_value = 0xff,
	.type = V4L2_CTRL_TYPE_INTEGER,
	}
	};


	#ifndef CONFIG_RADIO_TYPHOON_PORT
	#define CONFIG_RADIO_TYPHOON_PORT -1
	#endif

	#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
	#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
	#endif

	#ifndef CONFIG_PROC_FS
	#undef CONFIG_RADIO_TYPHOON_PROC_FS
	#endif

	struct typhoon_device {
	int users;
	int iobase;
	int curvol;
	int muted;
	unsigned long curfreq;
	unsigned long mutefreq;
	struct mutex lock;
	};

	static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
	static int typhoon_setfreq_generic(struct typhoon_device *dev,
	unsigned long frequency);
	static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
	static void typhoon_mute(struct typhoon_device *dev);
	static void typhoon_unmute(struct typhoon_device *dev);
	static int typhoon_setvol(struct typhoon_device *dev, int vol);

	static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
	{
	mutex_lock(&dev->lock);
	vol >>= 14; /* Map 16 bit to 2 bit */
	vol &= 3;
	outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */
	outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */
	mutex_unlock(&dev->lock);
	}

	static int typhoon_setfreq_generic(struct typhoon_device *dev,
	unsigned long frequency)
	{
	unsigned long outval;
	unsigned long x;

	/*
	* The frequency transfer curve is not linear. The best fit I could
	* get is
	*
	* outval = -155 + exp((f + 15.55) * 0.057))
	*
	* where frequency f is in MHz. Since we don't have exp in the kernel,
	* I approximate this function by a third order polynomial.
	*
	*/

	mutex_lock(&dev->lock);
	x = frequency / 160;
	outval = (x * x + 2500) / 5000;
	outval = (outval * x + 5000) / 10000;
	outval -= (10 * x * x + 10433) / 20866;
	outval += 4 * x - 11505;

	outb_p((outval >> 8) & 0x01, dev->iobase + 4);
	outb_p(outval >> 9, dev->iobase + 6);
	outb_p(outval & 0xff, dev->iobase + 8);
	mutex_unlock(&dev->lock);

	return 0;
	}

	static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
	{
	typhoon_setfreq_generic(dev, frequency);
	dev->curfreq = frequency;
	return 0;
	}

	static void typhoon_mute(struct typhoon_device *dev)
	{
	if (dev->muted == 1)
	return;
	typhoon_setvol_generic(dev, 0);
	typhoon_setfreq_generic(dev, dev->mutefreq);
	dev->muted = 1;
	}

	static void typhoon_unmute(struct typhoon_device *dev)
	{
	if (dev->muted == 0)
	return;
	typhoon_setfreq_generic(dev, dev->curfreq);
	typhoon_setvol_generic(dev, dev->curvol);
	dev->muted = 0;
	}

	static int typhoon_setvol(struct typhoon_device *dev, int vol)
	{
	if (dev->muted && vol != 0) { /* user is unmuting the card */
	dev->curvol = vol;
	typhoon_unmute(dev);
	return 0;
	}
	if (vol == dev->curvol) /* requested volume == current */
	return 0;

	if (vol == 0) { /* volume == 0 means mute the card */
	typhoon_mute(dev);
	dev->curvol = vol;
	return 0;
	}
	typhoon_setvol_generic(dev, vol);
	dev->curvol = vol;
	return 0;
	}

	static int vidioc_querycap(struct file file, void priv,
	struct v4l2_capability *v)
	{
	strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
	strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
	sprintf(v->bus_info, "ISA");
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER;
	return 0;
	}

	static int vidioc_g_tuner(struct file file, void priv,
	struct v4l2_tuner *v)
	{
	if (v->index > 0)
	return -EINVAL;

	strcpy(v->name, "FM");
	v->type = V4L2_TUNER_RADIO;
	v->rangelow = (87.5*16000);
	v->rangehigh = (108*16000);
	v->rxsubchans = V4L2_TUNER_SUB_MONO;
	v->capability = V4L2_TUNER_CAP_LOW;
	v->audmode = V4L2_TUNER_MODE_MONO;
	v->signal = 0xFFFF; /* We can't get the signal strength */
	return 0;
	}

	static int vidioc_s_tuner(struct file file, void priv,
	struct v4l2_tuner *v)
	{
	if (v->index > 0)
	return -EINVAL;

	return 0;
	}

	static int vidioc_s_frequency(struct file file, void priv,
	struct v4l2_frequency *f)
	{
	struct video_device *dev = video_devdata(file);
	struct typhoon_device *typhoon = dev->priv;

	typhoon->curfreq = f->frequency;
	typhoon_setfreq(typhoon, typhoon->curfreq);
	return 0;
	}

	static int vidioc_g_frequency(struct file file, void priv,
	struct v4l2_frequency *f)
	{
	struct video_device *dev = video_devdata(file);
	struct typhoon_device *typhoon = dev->priv;

	f->type = V4L2_TUNER_RADIO;
	f->frequency = typhoon->curfreq;

	return 0;
	}

	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;
	}

	static int vidioc_g_ctrl(struct file file, void priv,
	struct v4l2_control *ctrl)
	{
	struct video_device *dev = video_devdata(file);
	struct typhoon_device *typhoon = dev->priv;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	ctrl->value = typhoon->muted;
	return 0;
	case V4L2_CID_AUDIO_VOLUME:
	ctrl->value = typhoon->curvol;
	return 0;
	}
	return -EINVAL;
	}

	static int vidioc_s_ctrl (struct file file, void priv,
	struct v4l2_control *ctrl)
	{
	struct video_device *dev = video_devdata(file);
	struct typhoon_device *typhoon = dev->priv;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	if (ctrl->value)
	typhoon_mute(typhoon);
	else
	typhoon_unmute(typhoon);
	return 0;
	case V4L2_CID_AUDIO_VOLUME:
	typhoon_setvol(typhoon, ctrl->value);
	return 0;
	}
	return -EINVAL;
	}

	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;
	}

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

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

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

	static struct typhoon_device typhoon_unit =
	{
	.iobase = CONFIG_RADIO_TYPHOON_PORT,
	.curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
	.mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
	};

	static const struct file_operations typhoon_fops = {
	.owner = THIS_MODULE,
	.open = video_exclusive_open,
	.release = video_exclusive_release,
	.ioctl = video_ioctl2,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = v4l_compat_ioctl32,
	#endif
	.llseek = no_llseek,
	};

	static const struct v4l2_ioctl_ops typhoon_ioctl_ops = {
	.vidioc_querycap = vidioc_querycap,
	.vidioc_g_tuner = vidioc_g_tuner,
	.vidioc_s_tuner = vidioc_s_tuner,
	.vidioc_g_audio = vidioc_g_audio,
	.vidioc_s_audio = vidioc_s_audio,
	.vidioc_g_input = vidioc_g_input,
	.vidioc_s_input = vidioc_s_input,
	.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,
	};

	static struct video_device typhoon_radio = {
	.name = "Typhoon Radio",
	.fops = &typhoon_fops,
	.ioctl_ops = &typhoon_ioctl_ops,
	};

	#ifdef CONFIG_RADIO_TYPHOON_PROC_FS

	static int typhoon_proc_show(struct seq_file m, void v)
	{
	#ifdef MODULE
	#define MODULEPROCSTRING "Driver loaded as a module"
	#else
	#define MODULEPROCSTRING "Driver compiled into kernel"
	#endif

	seq_puts(m, BANNER);
	seq_puts(m, "Load type: " MODULEPROCSTRING "\n\n");
	seq_printf(m, "frequency = %lu kHz\n",
	typhoon_unit.curfreq >> 4);
	seq_printf(m, "volume = %d\n", typhoon_unit.curvol);
	seq_printf(m, "mute = %s\n", typhoon_unit.muted ?
	"on" : "off");
	seq_printf(m, "iobase = 0x%x\n", typhoon_unit.iobase);
	seq_printf(m, "mute frequency = %lu kHz\n",
	typhoon_unit.mutefreq >> 4);
	return 0;
	}

	static int typhoon_proc_open(struct inode inode, struct file file)
	{
	return single_open(file, typhoon_proc_show, NULL);
	}

	static const struct file_operations typhoon_proc_fops = {
	.owner = THIS_MODULE,
	.open = typhoon_proc_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};
	#endif /* CONFIG_RADIO_TYPHOON_PROC_FS */

	MODULE_AUTHOR("Dr. Henrik Seidel");
	MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
	MODULE_LICENSE("GPL");

	static int io = -1;
	static int radio_nr = -1;

	module_param(io, int, 0);
	MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
	module_param(radio_nr, int, 0);

	#ifdef MODULE
	static unsigned long mutefreq;
	module_param(mutefreq, ulong, 0);
	MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
	#endif

	static int __init typhoon_init(void)
	{
	#ifdef MODULE
	if (io == -1) {
	printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
	return -EINVAL;
	}
	typhoon_unit.iobase = io;

	if (mutefreq < 87000 \|\| mutefreq > 108500) {
	printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
	printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
	return -EINVAL;
	}
	typhoon_unit.mutefreq = mutefreq;
	#endif /* MODULE */

	printk(KERN_INFO BANNER);
	mutex_init(&typhoon_unit.lock);
	io = typhoon_unit.iobase;
	if (!request_region(io, 8, "typhoon")) {
	printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
	typhoon_unit.iobase);
	return -EBUSY;
	}

	typhoon_radio.priv = &typhoon_unit;
	if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1)
	{
	release_region(io, 8);
	return -EINVAL;
	}
	printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
	printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
	typhoon_unit.mutefreq);
	typhoon_unit.mutefreq <<= 4;

	/* mute card - prevents noisy bootups */
	typhoon_mute(&typhoon_unit);

	#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
	if (!proc_create("driver/radio-typhoon", 0, NULL, &typhoon_proc_fops))
	printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
	#endif

	return 0;
	}

	static void __exit typhoon_cleanup_module(void)
	{

	#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
	remove_proc_entry("driver/radio-typhoon", NULL);
	#endif

	video_unregister_device(&typhoon_radio);
	release_region(io, 8);
	}

	module_init(typhoon_init);
	module_exit(typhoon_cleanup_module);