drivers/media/radio/radio-maxiradio.c - kernel/msm - Gitiles

 /*
  * Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux
  * (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
  *
  * Based in the radio Maestro PCI driver. Actually it uses the same chip
  * for radio but different pci controller.
  *
  * I didn't have any specs I reversed engineered the protocol from
  * the windows driver (radio.dll).
  *
  * The card uses the TEA5757 chip that includes a search function but it
  * is useless as I haven't found any way to read back the frequency. If
  * anybody does please mail me.
  *
  * For the pdf file see:
  * http://www.semiconductors.philips.com/pip/TEA5757H/V1
  *
  *
  * CHANGES:
  *   0.75b
  *     - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
  *
  *   0.75      Sun Feb  4 22:51:27 EET 2001
  *     - tiding up
  *     - removed support for multiple devices as it didn't work anyway
  *
  * BUGS:
  *   - card unmutes if you change frequency
  *
  * (c) 2006, 2007 by Mauro Carvalho Chehab <mchehab@infradead.org>:
  *	- Conversion to V4L2 API
  *      - Uses video_ioctl2 for parsing and to add debug support
  */


 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/delay.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <linux/mutex.h>

 #include <linux/pci.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-common.h>

 #define DRIVER_VERSION	"0.77"

 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
 #define RADIO_VERSION KERNEL_VERSION(0,7,7)

 static struct video_device maxiradio_radio;

 #define dprintk(num, fmt, arg...)                                          \
 	do {                                                               \
 		if (maxiradio_radio.debug >= num)                          \
 			printk(KERN_DEBUG "%s: " fmt,                      \
 				maxiradio_radio.name, ## arg); } while (0)

 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,
 	}
 };

 #ifndef PCI_VENDOR_ID_GUILLEMOT
 #define PCI_VENDOR_ID_GUILLEMOT 0x5046
 #endif

 #ifndef PCI_DEVICE_ID_GUILLEMOT
 #define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
 #endif


 /* TEA5757 pin mappings */
 static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;

 static int radio_nr = -1;
 module_param(radio_nr, int, 0);


 #define FREQ_LO		 50*16000
 #define FREQ_HI		150*16000

 #define FREQ_IF         171200 /* 10.7*16000   */
 #define FREQ_STEP       200    /* 12.5*16      */

 /* (x==fmhz*16*1000) -> bits */
 #define FREQ2BITS(x)	((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1)) \
 			/(FREQ_STEP<<2))<<2)

 #define BITS2FREQ(x)	((x) * FREQ_STEP - FREQ_IF)


 static const struct file_operations maxiradio_fops = {
 	.owner		= THIS_MODULE,
 	.open           = video_exclusive_open,
 	.release        = video_exclusive_release,
 	.ioctl          = video_ioctl2,
 	.compat_ioctl	= v4l_compat_ioctl32,
 	.llseek         = no_llseek,
 };

 static struct radio_device
 {
 	__u16	io,	/* base of radio io */
 		muted,	/* VIDEO_AUDIO_MUTE */
 		stereo,	/* VIDEO_TUNER_STEREO_ON */
 		tuned;	/* signal strength (0 or 0xffff) */

 	unsigned long freq;

 	struct mutex lock;
 } radio_unit = {
 	.muted =1,
 	.freq = FREQ_LO,
 };

 static void outbit(unsigned long bit, __u16 io)
 {
 	if (bit != 0)
 		{
 			outb(  power|wren|data     ,io); udelay(4);
 			outb(  power|wren|data|clk ,io); udelay(4);
 			outb(  power|wren|data     ,io); udelay(4);
 		}
 	else
 		{
 			outb(  power|wren          ,io); udelay(4);
 			outb(  power|wren|clk      ,io); udelay(4);
 			outb(  power|wren          ,io); udelay(4);
 		}
 }

 static void turn_power(__u16 io, int p)
 {
 	if (p != 0) {
 		dprintk(1, "Radio powered on\n");
 		outb(power, io);
 	} else {
 		dprintk(1, "Radio powered off\n");
 		outb(0,io);
 	}
 }

 static void set_freq(__u16 io, __u32 freq)
 {
 	unsigned long int si;
 	int bl;
 	int data = FREQ2BITS(freq);

 	/* TEA5757 shift register bits (see pdf) */

 	outbit(0,io); // 24  search
 	outbit(1,io); // 23  search up/down

 	outbit(0,io); // 22  stereo/mono

 	outbit(0,io); // 21  band
 	outbit(0,io); // 20  band (only 00=FM works I think)

 	outbit(0,io); // 19  port ?
 	outbit(0,io); // 18  port ?

 	outbit(0,io); // 17  search level
 	outbit(0,io); // 16  search level

 	si = 0x8000;
 	for (bl = 1; bl <= 16 ; bl++) {
 		outbit(data & si,io);
 		si >>=1;
 	}

 	dprintk(1, "Radio freq set to %d.%02d MHz\n",
 				freq / 16000,
 				freq % 16000 * 100 / 16000);

 	turn_power(io, 1);
 }

 static int get_stereo(__u16 io)
 {
 	outb(power,io);
 	udelay(4);

 	return !(inb(io) & mo_st);
 }

 static int get_tune(__u16 io)
 {
 	outb(power+clk,io);
 	udelay(4);

 	return !(inb(io) & mo_st);
 }


 static int vidioc_querycap (struct file *file, void  *priv,
 			    struct v4l2_capability *v)
 {
 	strlcpy(v->driver, "radio-maxiradio", sizeof (v->driver));
 	strlcpy(v->card, "Maxi Radio FM2000 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)
 {
 	struct video_device *dev = video_devdata(file);
 	struct radio_device *card=dev->priv;

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

 	memset(v,0,sizeof(*v));
 	strcpy(v->name, "FM");
 	v->type = V4L2_TUNER_RADIO;

 	v->rangelow=FREQ_LO;
 	v->rangehigh=FREQ_HI;
 	v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
 	v->capability=V4L2_TUNER_CAP_LOW;
 	if(get_stereo(card->io))
 		v->audmode = V4L2_TUNER_MODE_STEREO;
 	else
 		v->audmode = V4L2_TUNER_MODE_MONO;
 	v->signal=0xffff*get_tune(card->io);

 	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_g_audio (struct file *file, void *priv,
 			   struct v4l2_audio *a)
 {
 	if (a->index > 1)
 		return -EINVAL;

 	strcpy(a->name, "FM");
 	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 int vidioc_s_frequency (struct file *file, void *priv,
 			       struct v4l2_frequency *f)
 {
 	struct video_device *dev = video_devdata(file);
 	struct radio_device *card=dev->priv;

 	if (f->frequency < FREQ_LO || f->frequency > FREQ_HI) {
 		dprintk(1, "radio freq (%d.%02d MHz) out of range (%d-%d)\n",
 					f->frequency / 16000,
 					f->frequency % 16000 * 100 / 16000,
 					FREQ_LO / 16000, FREQ_HI / 16000);

 		return -EINVAL;
 	}

 	card->freq = f->frequency;
 	set_freq(card->io, card->freq);
 	msleep(125);

 	return 0;
 }

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

 	f->type = V4L2_TUNER_RADIO;
 	f->frequency = card->freq;

 	dprintk(4, "radio freq is %d.%02d MHz",
 				f->frequency / 16000,
 				f->frequency % 16000 * 100 / 16000);

 	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 radio_device *card=dev->priv;

 	switch (ctrl->id) {
 		case V4L2_CID_AUDIO_MUTE:
 			ctrl->value=card->muted;
 			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 radio_device *card=dev->priv;

 	switch (ctrl->id) {
 		case V4L2_CID_AUDIO_MUTE:
 			card->muted = ctrl->value;
 			if(card->muted)
 				turn_power(card->io, 0);
 			else
 				set_freq(card->io, card->freq);
 			return 0;
 	}

 	return -EINVAL;
 }

 static struct video_device maxiradio_radio =
 {
 	.owner		    = THIS_MODULE,
 	.name		    = "Maxi Radio FM2000 radio",
 	.type		    = VID_TYPE_TUNER,
 	.fops               = &maxiradio_fops,

 	.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 int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	if(!request_region(pci_resource_start(pdev, 0),
 			   pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 		printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
 		goto err_out;
 	}

 	if (pci_enable_device(pdev))
 		goto err_out_free_region;

 	radio_unit.io = pci_resource_start(pdev, 0);
 	mutex_init(&radio_unit.lock);
 	maxiradio_radio.priv = &radio_unit;

 	if (video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
 		printk("radio-maxiradio: can't register device!");
 		goto err_out_free_region;
 	}

 	printk(KERN_INFO "radio-maxiradio: version "
 	       DRIVER_VERSION
 	       " time "
 	       __TIME__ "  "
 	       __DATE__
 	       "\n");

 	printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
 	       radio_unit.io);
 	return 0;

 err_out_free_region:
 	release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 err_out:
 	return -ENODEV;
 }

 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 {
 	video_unregister_device(&maxiradio_radio);
 	release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 }

 static struct pci_device_id maxiradio_pci_tbl[] = {
 	{ PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 		PCI_ANY_ID, PCI_ANY_ID, },
 	{ 0,}
 };

 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);

 static struct pci_driver maxiradio_driver = {
 	.name		= "radio-maxiradio",
 	.id_table	= maxiradio_pci_tbl,
 	.probe		= maxiradio_init_one,
 	.remove		= __devexit_p(maxiradio_remove_one),
 };

 static int __init maxiradio_radio_init(void)
 {
 	return pci_register_driver(&maxiradio_driver);
 }

 static void __exit maxiradio_radio_exit(void)
 {
 	pci_unregister_driver(&maxiradio_driver);
 }

 module_init(maxiradio_radio_init);
 module_exit(maxiradio_radio_exit);

 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
 MODULE_LICENSE("GPL");

 module_param_named(debug,maxiradio_radio.debug, int, 0644);
 MODULE_PARM_DESC(debug,"activates debug info");
	/*
	* Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux
	* (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
	*
	* Based in the radio Maestro PCI driver. Actually it uses the same chip
	* for radio but different pci controller.
	*
	* I didn't have any specs I reversed engineered the protocol from
	* the windows driver (radio.dll).
	*
	* The card uses the TEA5757 chip that includes a search function but it
	* is useless as I haven't found any way to read back the frequency. If
	* anybody does please mail me.
	*
	* For the pdf file see:
	* http://www.semiconductors.philips.com/pip/TEA5757H/V1
	*
	*
	* CHANGES:
	* 0.75b
	* - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
	*
	* 0.75 Sun Feb 4 22:51:27 EET 2001
	* - tiding up
	* - removed support for multiple devices as it didn't work anyway
	*
	* BUGS:
	* - card unmutes if you change frequency
	*
	* (c) 2006, 2007 by Mauro Carvalho Chehab <mchehab@infradead.org>:
	* - Conversion to V4L2 API
	* - Uses video_ioctl2 for parsing and to add debug support
	*/


	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <linux/delay.h>
	#include <asm/io.h>
	#include <asm/uaccess.h>
	#include <linux/mutex.h>

	#include <linux/pci.h>
	#include <linux/videodev2.h>
	#include <media/v4l2-common.h>

	#define DRIVER_VERSION "0.77"

	#include <linux/version.h> /* for KERNEL_VERSION MACRO */
	#define RADIO_VERSION KERNEL_VERSION(0,7,7)

	static struct video_device maxiradio_radio;

	#define dprintk(num, fmt, arg...) \
	do { \
	if (maxiradio_radio.debug >= num) \
	printk(KERN_DEBUG "%s: " fmt, \
	maxiradio_radio.name, ## arg); } while (0)

	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,
	}
	};

	#ifndef PCI_VENDOR_ID_GUILLEMOT
	#define PCI_VENDOR_ID_GUILLEMOT 0x5046
	#endif

	#ifndef PCI_DEVICE_ID_GUILLEMOT
	#define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
	#endif


	/* TEA5757 pin mappings */
	static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;

	static int radio_nr = -1;
	module_param(radio_nr, int, 0);


	#define FREQ_LO 50*16000
	#define FREQ_HI 150*16000

	#define FREQ_IF 171200 /* 10.716000 /
	#define FREQ_STEP 200 /* 12.516 /

	/* (x==fmhz161000) -> bits */
	#define FREQ2BITS(x) ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1)) \
	/(FREQ_STEP<<2))<<2)

	#define BITS2FREQ(x) ((x) * FREQ_STEP - FREQ_IF)


	static const struct file_operations maxiradio_fops = {
	.owner = THIS_MODULE,
	.open = video_exclusive_open,
	.release = video_exclusive_release,
	.ioctl = video_ioctl2,
	.compat_ioctl = v4l_compat_ioctl32,
	.llseek = no_llseek,
	};

	static struct radio_device
	{
	__u16 io, /* base of radio io */
	muted, /* VIDEO_AUDIO_MUTE */
	stereo, /* VIDEO_TUNER_STEREO_ON */
	tuned; /* signal strength (0 or 0xffff) */

	unsigned long freq;

	struct mutex lock;
	} radio_unit = {
	.muted =1,
	.freq = FREQ_LO,
	};

	static void outbit(unsigned long bit, __u16 io)
	{
	if (bit != 0)
	{
	outb( power\|wren\|data ,io); udelay(4);
	outb( power\|wren\|data\|clk ,io); udelay(4);
	outb( power\|wren\|data ,io); udelay(4);
	}
	else
	{
	outb( power\|wren ,io); udelay(4);
	outb( power\|wren\|clk ,io); udelay(4);
	outb( power\|wren ,io); udelay(4);
	}
	}

	static void turn_power(__u16 io, int p)
	{
	if (p != 0) {
	dprintk(1, "Radio powered on\n");
	outb(power, io);
	} else {
	dprintk(1, "Radio powered off\n");
	outb(0,io);
	}
	}

	static void set_freq(__u16 io, __u32 freq)
	{
	unsigned long int si;
	int bl;
	int data = FREQ2BITS(freq);

	/* TEA5757 shift register bits (see pdf) */

	outbit(0,io); // 24 search
	outbit(1,io); // 23 search up/down

	outbit(0,io); // 22 stereo/mono

	outbit(0,io); // 21 band
	outbit(0,io); // 20 band (only 00=FM works I think)

	outbit(0,io); // 19 port ?
	outbit(0,io); // 18 port ?

	outbit(0,io); // 17 search level
	outbit(0,io); // 16 search level

	si = 0x8000;
	for (bl = 1; bl <= 16 ; bl++) {
	outbit(data & si,io);
	si >>=1;
	}

	dprintk(1, "Radio freq set to %d.%02d MHz\n",
	freq / 16000,
	freq % 16000 * 100 / 16000);

	turn_power(io, 1);
	}

	static int get_stereo(__u16 io)
	{
	outb(power,io);
	udelay(4);

	return !(inb(io) & mo_st);
	}

	static int get_tune(__u16 io)
	{
	outb(power+clk,io);
	udelay(4);

	return !(inb(io) & mo_st);
	}


	static int vidioc_querycap (struct file file, void priv,
	struct v4l2_capability *v)
	{
	strlcpy(v->driver, "radio-maxiradio", sizeof (v->driver));
	strlcpy(v->card, "Maxi Radio FM2000 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)
	{
	struct video_device *dev = video_devdata(file);
	struct radio_device *card=dev->priv;

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

	memset(v,0,sizeof(*v));
	strcpy(v->name, "FM");
	v->type = V4L2_TUNER_RADIO;

	v->rangelow=FREQ_LO;
	v->rangehigh=FREQ_HI;
	v->rxsubchans =V4L2_TUNER_SUB_MONO\|V4L2_TUNER_SUB_STEREO;
	v->capability=V4L2_TUNER_CAP_LOW;
	if(get_stereo(card->io))
	v->audmode = V4L2_TUNER_MODE_STEREO;
	else
	v->audmode = V4L2_TUNER_MODE_MONO;
	v->signal=0xffff*get_tune(card->io);

	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_g_audio (struct file file, void priv,
	struct v4l2_audio *a)
	{
	if (a->index > 1)
	return -EINVAL;

	strcpy(a->name, "FM");
	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 int vidioc_s_frequency (struct file file, void priv,
	struct v4l2_frequency *f)
	{
	struct video_device *dev = video_devdata(file);
	struct radio_device *card=dev->priv;

	if (f->frequency < FREQ_LO \|\| f->frequency > FREQ_HI) {
	dprintk(1, "radio freq (%d.%02d MHz) out of range (%d-%d)\n",
	f->frequency / 16000,
	f->frequency % 16000 * 100 / 16000,
	FREQ_LO / 16000, FREQ_HI / 16000);

	return -EINVAL;
	}

	card->freq = f->frequency;
	set_freq(card->io, card->freq);
	msleep(125);

	return 0;
	}

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

	f->type = V4L2_TUNER_RADIO;
	f->frequency = card->freq;

	dprintk(4, "radio freq is %d.%02d MHz",
	f->frequency / 16000,
	f->frequency % 16000 * 100 / 16000);

	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 radio_device *card=dev->priv;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	ctrl->value=card->muted;
	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 radio_device *card=dev->priv;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	card->muted = ctrl->value;
	if(card->muted)
	turn_power(card->io, 0);
	else
	set_freq(card->io, card->freq);
	return 0;
	}

	return -EINVAL;
	}

	static struct video_device maxiradio_radio =
	{
	.owner = THIS_MODULE,
	.name = "Maxi Radio FM2000 radio",
	.type = VID_TYPE_TUNER,
	.fops = &maxiradio_fops,

	.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 int __devinit maxiradio_init_one(struct pci_dev pdev, const struct pci_device_id ent)
	{
	if(!request_region(pci_resource_start(pdev, 0),
	pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
	printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
	goto err_out;
	}

	if (pci_enable_device(pdev))
	goto err_out_free_region;

	radio_unit.io = pci_resource_start(pdev, 0);
	mutex_init(&radio_unit.lock);
	maxiradio_radio.priv = &radio_unit;

	if (video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
	printk("radio-maxiradio: can't register device!");
	goto err_out_free_region;
	}

	printk(KERN_INFO "radio-maxiradio: version "
	DRIVER_VERSION
	" time "
	__TIME__ " "
	__DATE__
	"\n");

	printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
	radio_unit.io);
	return 0;

	err_out_free_region:
	release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
	err_out:
	return -ENODEV;
	}

	static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
	{
	video_unregister_device(&maxiradio_radio);
	release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
	}

	static struct pci_device_id maxiradio_pci_tbl[] = {
	{ PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
	PCI_ANY_ID, PCI_ANY_ID, },
	{ 0,}
	};

	MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);

	static struct pci_driver maxiradio_driver = {
	.name = "radio-maxiradio",
	.id_table = maxiradio_pci_tbl,
	.probe = maxiradio_init_one,
	.remove = __devexit_p(maxiradio_remove_one),
	};

	static int __init maxiradio_radio_init(void)
	{
	return pci_register_driver(&maxiradio_driver);
	}

	static void __exit maxiradio_radio_exit(void)
	{
	pci_unregister_driver(&maxiradio_driver);
	}

	module_init(maxiradio_radio_init);
	module_exit(maxiradio_radio_exit);

	MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
	MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
	MODULE_LICENSE("GPL");

	module_param_named(debug,maxiradio_radio.debug, int, 0644);
	MODULE_PARM_DESC(debug,"activates debug info");