drivers/media/radio/radio-sf16fmi.c - maze/linux - Git at Google

 /* SF16FMI radio driver for Linux radio support
  * heavily based on rtrack driver...
  * (c) 1997 M. Kirkwood
  * (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz
  *
  * Fitted to new interface by Alan Cox <alan@lxorguk.ukuu.org.uk>
  * Made working and cleaned up functions <mikael.hedin@irf.se>
  * Support for ISAPnP by Ladislav Michl <ladis@psi.cz>
  *
  * Notes on the hardware
  *
  *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
  *  No volume control - only mute/unmute - you have to use line volume
  *  control on SB-part of SF16FMI
  *
  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  */

 #include <linux/version.h>
 #include <linux/kernel.h>	/* __setup			*/
 #include <linux/module.h>	/* Modules 			*/
 #include <linux/init.h>		/* Initdata			*/
 #include <linux/ioport.h>	/* request_region		*/
 #include <linux/delay.h>	/* udelay			*/
 #include <linux/isapnp.h>
 #include <linux/mutex.h>
 #include <linux/videodev2.h>	/* kernel radio structs		*/
 #include <linux/io.h>		/* outb, outb_p			*/
 #include <media/v4l2-device.h>
 #include <media/v4l2-ioctl.h>

 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
 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 SF16MI card (0x284 or 0x384)");
 module_param(radio_nr, int, 0);

 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)

 struct fmi
 {
 	struct v4l2_device v4l2_dev;
 	struct video_device vdev;
 	int io;
 	int curvol; /* 1 or 0 */
 	unsigned long curfreq; /* freq in kHz */
 	struct mutex lock;
 };

 static struct fmi fmi_card;
 static struct pnp_dev *dev;

 /* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
 /* It is only useful to give freq in interval of 800 (=0.05Mhz),
  * other bits will be truncated, e.g 92.7400016 -> 92.7, but
  * 92.7400017 -> 92.75
  */
 #define RSF16_ENCODE(x)	((x) / 800 + 214)
 #define RSF16_MINFREQ (87 * 16000)
 #define RSF16_MAXFREQ (108 * 16000)

 static void outbits(int bits, unsigned int data, int io)
 {
 	while (bits--) {
 		if (data & 1) {
 			outb(5, io);
 			udelay(6);
 			outb(7, io);
 			udelay(6);
 		} else {
 			outb(1, io);
 			udelay(6);
 			outb(3, io);
 			udelay(6);
 		}
 		data >>= 1;
 	}
 }

 static inline void fmi_mute(struct fmi *fmi)
 {
 	mutex_lock(&fmi->lock);
 	outb(0x00, fmi->io);
 	mutex_unlock(&fmi->lock);
 }

 static inline void fmi_unmute(struct fmi *fmi)
 {
 	mutex_lock(&fmi->lock);
 	outb(0x08, fmi->io);
 	mutex_unlock(&fmi->lock);
 }

 static inline int fmi_setfreq(struct fmi *fmi, unsigned long freq)
 {
 	mutex_lock(&fmi->lock);
 	fmi->curfreq = freq;

 	outbits(16, RSF16_ENCODE(freq), fmi->io);
 	outbits(8, 0xC0, fmi->io);
 	msleep(143);		/* was schedule_timeout(HZ/7) */
 	mutex_unlock(&fmi->lock);
 	if (fmi->curvol)
 		fmi_unmute(fmi);
 	return 0;
 }

 static inline int fmi_getsigstr(struct fmi *fmi)
 {
 	int val;
 	int res;

 	mutex_lock(&fmi->lock);
 	val = fmi->curvol ? 0x08 : 0x00;	/* unmute/mute */
 	outb(val, fmi->io);
 	outb(val | 0x10, fmi->io);
 	msleep(143); 		/* was schedule_timeout(HZ/7) */
 	res = (int)inb(fmi->io + 1);
 	outb(val, fmi->io);

 	mutex_unlock(&fmi->lock);
 	return (res & 2) ? 0 : 0xFFFF;
 }

 static int vidioc_querycap(struct file *file, void  *priv,
 					struct v4l2_capability *v)
 {
 	strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
 	strlcpy(v->card, "SF16-FMx radio", sizeof(v->card));
 	strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 	v->version = RADIO_VERSION;
 	v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 	return 0;
 }

 static int vidioc_g_tuner(struct file *file, void *priv,
 					struct v4l2_tuner *v)
 {
 	struct fmi *fmi = video_drvdata(file);

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

 	strlcpy(v->name, "FM", sizeof(v->name));
 	v->type = V4L2_TUNER_RADIO;
 	v->rangelow = RSF16_MINFREQ;
 	v->rangehigh = RSF16_MAXFREQ;
 	v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 	v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
 	v->audmode = V4L2_TUNER_MODE_STEREO;
 	v->signal = fmi_getsigstr(fmi);
 	return 0;
 }

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

 static int vidioc_s_frequency(struct file *file, void *priv,
 					struct v4l2_frequency *f)
 {
 	struct fmi *fmi = video_drvdata(file);

 	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 		return -EINVAL;
 	if (f->frequency < RSF16_MINFREQ ||
 			f->frequency > RSF16_MAXFREQ)
 		return -EINVAL;
 	/* rounding in steps of 800 to match the freq
 	   that will be used */
 	fmi_setfreq(fmi, (f->frequency / 800) * 800);
 	return 0;
 }

 static int vidioc_g_frequency(struct file *file, void *priv,
 					struct v4l2_frequency *f)
 {
 	struct fmi *fmi = video_drvdata(file);

 	if (f->tuner != 0)
 		return -EINVAL;
 	f->type = V4L2_TUNER_RADIO;
 	f->frequency = fmi->curfreq;
 	return 0;
 }

 static int vidioc_queryctrl(struct file *file, void *priv,
 					struct v4l2_queryctrl *qc)
 {
 	switch (qc->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 	}
 	return -EINVAL;
 }

 static int vidioc_g_ctrl(struct file *file, void *priv,
 					struct v4l2_control *ctrl)
 {
 	struct fmi *fmi = video_drvdata(file);

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

 static int vidioc_s_ctrl(struct file *file, void *priv,
 					struct v4l2_control *ctrl)
 {
 	struct fmi *fmi = video_drvdata(file);

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		if (ctrl->value)
 			fmi_mute(fmi);
 		else
 			fmi_unmute(fmi);
 		fmi->curvol = ctrl->value;
 		return 0;
 	}
 	return -EINVAL;
 }

 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)
 {
 	return i ? -EINVAL : 0;
 }

 static int vidioc_g_audio(struct file *file, void *priv,
 					struct v4l2_audio *a)
 {
 	a->index = 0;
 	strlcpy(a->name, "Radio", sizeof(a->name));
 	a->capability = V4L2_AUDCAP_STEREO;
 	return 0;
 }

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

 static const struct v4l2_file_operations fmi_fops = {
 	.owner		= THIS_MODULE,
 	.ioctl		= video_ioctl2,
 };

 static const struct v4l2_ioctl_ops fmi_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,
 };

 /* ladis: this is my card. does any other types exist? */
 static struct isapnp_device_id id_table[] __devinitdata = {
 	{	ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 		ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 	{	ISAPNP_CARD_END, },
 };

 MODULE_DEVICE_TABLE(isapnp, id_table);

 static int __init isapnp_fmi_probe(void)
 {
 	int i = 0;

 	while (id_table[i].card_vendor != 0 && dev == NULL) {
 		dev = pnp_find_dev(NULL, id_table[i].vendor,
 				   id_table[i].function, NULL);
 		i++;
 	}

 	if (!dev)
 		return -ENODEV;
 	if (pnp_device_attach(dev) < 0)
 		return -EAGAIN;
 	if (pnp_activate_dev(dev) < 0) {
 		printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n");
 		pnp_device_detach(dev);
 		return -ENOMEM;
 	}
 	if (!pnp_port_valid(dev, 0)) {
 		pnp_device_detach(dev);
 		return -ENODEV;
 	}

 	i = pnp_port_start(dev, 0);
 	printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i);

 	return i;
 }

 static int __init fmi_init(void)
 {
 	struct fmi *fmi = &fmi_card;
 	struct v4l2_device *v4l2_dev = &fmi->v4l2_dev;
 	int res;

 	if (io < 0)
 		io = isapnp_fmi_probe();
 	strlcpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name));
 	fmi->io = io;
 	if (fmi->io < 0) {
 		v4l2_err(v4l2_dev, "No PnP card found.\n");
 		return fmi->io;
 	}
 	if (!request_region(io, 2, "radio-sf16fmi")) {
 		v4l2_err(v4l2_dev, "port 0x%x already in use\n", fmi->io);
 		pnp_device_detach(dev);
 		return -EBUSY;
 	}

 	res = v4l2_device_register(NULL, v4l2_dev);
 	if (res < 0) {
 		release_region(fmi->io, 2);
 		pnp_device_detach(dev);
 		v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 		return res;
 	}

 	strlcpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name));
 	fmi->vdev.v4l2_dev = v4l2_dev;
 	fmi->vdev.fops = &fmi_fops;
 	fmi->vdev.ioctl_ops = &fmi_ioctl_ops;
 	fmi->vdev.release = video_device_release_empty;
 	video_set_drvdata(&fmi->vdev, fmi);

 	mutex_init(&fmi->lock);

 	if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 		v4l2_device_unregister(v4l2_dev);
 		release_region(fmi->io, 2);
 		pnp_device_detach(dev);
 		return -EINVAL;
 	}

 	v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io);
 	/* mute card - prevents noisy bootups */
 	fmi_mute(fmi);
 	return 0;
 }

 static void __exit fmi_exit(void)
 {
 	struct fmi *fmi = &fmi_card;

 	video_unregister_device(&fmi->vdev);
 	v4l2_device_unregister(&fmi->v4l2_dev);
 	release_region(fmi->io, 2);
 	if (dev)
 		pnp_device_detach(dev);
 }

 module_init(fmi_init);
 module_exit(fmi_exit);
	/* SF16FMI radio driver for Linux radio support
	* heavily based on rtrack driver...
	* (c) 1997 M. Kirkwood
	* (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz
	*
	* Fitted to new interface by Alan Cox <alan@lxorguk.ukuu.org.uk>
	* Made working and cleaned up functions <mikael.hedin@irf.se>
	* Support for ISAPnP by Ladislav Michl <ladis@psi.cz>
	*
	* Notes on the hardware
	*
	* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
	* No volume control - only mute/unmute - you have to use line volume
	* control on SB-part of SF16FMI
	*
	* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
	*/

	#include <linux/version.h>
	#include <linux/kernel.h> /* __setup */
	#include <linux/module.h> /* Modules */
	#include <linux/init.h> /* Initdata */
	#include <linux/ioport.h> /* request_region */
	#include <linux/delay.h> /* udelay */
	#include <linux/isapnp.h>
	#include <linux/mutex.h>
	#include <linux/videodev2.h> /* kernel radio structs */
	#include <linux/io.h> /* outb, outb_p */
	#include <media/v4l2-device.h>
	#include <media/v4l2-ioctl.h>

	MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
	MODULE_DESCRIPTION("A driver for the SF16MI radio.");
	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 SF16MI card (0x284 or 0x384)");
	module_param(radio_nr, int, 0);

	#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)

	struct fmi
	{
	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	int io;
	int curvol; /* 1 or 0 */
	unsigned long curfreq; /* freq in kHz */
	struct mutex lock;
	};

	static struct fmi fmi_card;
	static struct pnp_dev *dev;

	/* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
	/* It is only useful to give freq in interval of 800 (=0.05Mhz),
	* other bits will be truncated, e.g 92.7400016 -> 92.7, but
	* 92.7400017 -> 92.75
	*/
	#define RSF16_ENCODE(x) ((x) / 800 + 214)
	#define RSF16_MINFREQ (87 * 16000)
	#define RSF16_MAXFREQ (108 * 16000)

	static void outbits(int bits, unsigned int data, int io)
	{
	while (bits--) {
	if (data & 1) {
	outb(5, io);
	udelay(6);
	outb(7, io);
	udelay(6);
	} else {
	outb(1, io);
	udelay(6);
	outb(3, io);
	udelay(6);
	}
	data >>= 1;
	}
	}

	static inline void fmi_mute(struct fmi *fmi)
	{
	mutex_lock(&fmi->lock);
	outb(0x00, fmi->io);
	mutex_unlock(&fmi->lock);
	}

	static inline void fmi_unmute(struct fmi *fmi)
	{
	mutex_lock(&fmi->lock);
	outb(0x08, fmi->io);
	mutex_unlock(&fmi->lock);
	}

	static inline int fmi_setfreq(struct fmi *fmi, unsigned long freq)
	{
	mutex_lock(&fmi->lock);
	fmi->curfreq = freq;

	outbits(16, RSF16_ENCODE(freq), fmi->io);
	outbits(8, 0xC0, fmi->io);
	msleep(143); /* was schedule_timeout(HZ/7) */
	mutex_unlock(&fmi->lock);
	if (fmi->curvol)
	fmi_unmute(fmi);
	return 0;
	}

	static inline int fmi_getsigstr(struct fmi *fmi)
	{
	int val;
	int res;

	mutex_lock(&fmi->lock);
	val = fmi->curvol ? 0x08 : 0x00; /* unmute/mute */
	outb(val, fmi->io);
	outb(val \| 0x10, fmi->io);
	msleep(143); /* was schedule_timeout(HZ/7) */
	res = (int)inb(fmi->io + 1);
	outb(val, fmi->io);

	mutex_unlock(&fmi->lock);
	return (res & 2) ? 0 : 0xFFFF;
	}

	static int vidioc_querycap(struct file file, void priv,
	struct v4l2_capability *v)
	{
	strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
	strlcpy(v->card, "SF16-FMx radio", sizeof(v->card));
	strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER \| V4L2_CAP_RADIO;
	return 0;
	}

	static int vidioc_g_tuner(struct file file, void priv,
	struct v4l2_tuner *v)
	{
	struct fmi *fmi = video_drvdata(file);

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

	strlcpy(v->name, "FM", sizeof(v->name));
	v->type = V4L2_TUNER_RADIO;
	v->rangelow = RSF16_MINFREQ;
	v->rangehigh = RSF16_MAXFREQ;
	v->rxsubchans = V4L2_TUNER_SUB_MONO \| V4L2_TUNER_SUB_STEREO;
	v->capability = V4L2_TUNER_CAP_STEREO \| V4L2_TUNER_CAP_LOW;
	v->audmode = V4L2_TUNER_MODE_STEREO;
	v->signal = fmi_getsigstr(fmi);
	return 0;
	}

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

	static int vidioc_s_frequency(struct file file, void priv,
	struct v4l2_frequency *f)
	{
	struct fmi *fmi = video_drvdata(file);

	if (f->tuner != 0 \|\| f->type != V4L2_TUNER_RADIO)
	return -EINVAL;
	if (f->frequency < RSF16_MINFREQ \|\|
	f->frequency > RSF16_MAXFREQ)
	return -EINVAL;
	/* rounding in steps of 800 to match the freq
	that will be used */
	fmi_setfreq(fmi, (f->frequency / 800) * 800);
	return 0;
	}

	static int vidioc_g_frequency(struct file file, void priv,
	struct v4l2_frequency *f)
	{
	struct fmi *fmi = video_drvdata(file);

	if (f->tuner != 0)
	return -EINVAL;
	f->type = V4L2_TUNER_RADIO;
	f->frequency = fmi->curfreq;
	return 0;
	}

	static int vidioc_queryctrl(struct file file, void priv,
	struct v4l2_queryctrl *qc)
	{
	switch (qc->id) {
	case V4L2_CID_AUDIO_MUTE:
	return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
	}
	return -EINVAL;
	}

	static int vidioc_g_ctrl(struct file file, void priv,
	struct v4l2_control *ctrl)
	{
	struct fmi *fmi = video_drvdata(file);

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

	static int vidioc_s_ctrl(struct file file, void priv,
	struct v4l2_control *ctrl)
	{
	struct fmi *fmi = video_drvdata(file);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	if (ctrl->value)
	fmi_mute(fmi);
	else
	fmi_unmute(fmi);
	fmi->curvol = ctrl->value;
	return 0;
	}
	return -EINVAL;
	}

	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)
	{
	return i ? -EINVAL : 0;
	}

	static int vidioc_g_audio(struct file file, void priv,
	struct v4l2_audio *a)
	{
	a->index = 0;
	strlcpy(a->name, "Radio", sizeof(a->name));
	a->capability = V4L2_AUDCAP_STEREO;
	return 0;
	}

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

	static const struct v4l2_file_operations fmi_fops = {
	.owner = THIS_MODULE,
	.ioctl = video_ioctl2,
	};

	static const struct v4l2_ioctl_ops fmi_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,
	};

	/* ladis: this is my card. does any other types exist? */
	static struct isapnp_device_id id_table[] __devinitdata = {
	{ ISAPNP_ANY_ID, ISAPNP_ANY_ID,
	ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
	{ ISAPNP_CARD_END, },
	};

	MODULE_DEVICE_TABLE(isapnp, id_table);

	static int __init isapnp_fmi_probe(void)
	{
	int i = 0;

	while (id_table[i].card_vendor != 0 && dev == NULL) {
	dev = pnp_find_dev(NULL, id_table[i].vendor,
	id_table[i].function, NULL);
	i++;
	}

	if (!dev)
	return -ENODEV;
	if (pnp_device_attach(dev) < 0)
	return -EAGAIN;
	if (pnp_activate_dev(dev) < 0) {
	printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n");
	pnp_device_detach(dev);
	return -ENOMEM;
	}
	if (!pnp_port_valid(dev, 0)) {
	pnp_device_detach(dev);
	return -ENODEV;
	}

	i = pnp_port_start(dev, 0);
	printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i);

	return i;
	}

	static int __init fmi_init(void)
	{
	struct fmi *fmi = &fmi_card;
	struct v4l2_device *v4l2_dev = &fmi->v4l2_dev;
	int res;

	if (io < 0)
	io = isapnp_fmi_probe();
	strlcpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name));
	fmi->io = io;
	if (fmi->io < 0) {
	v4l2_err(v4l2_dev, "No PnP card found.\n");
	return fmi->io;
	}
	if (!request_region(io, 2, "radio-sf16fmi")) {
	v4l2_err(v4l2_dev, "port 0x%x already in use\n", fmi->io);
	pnp_device_detach(dev);
	return -EBUSY;
	}

	res = v4l2_device_register(NULL, v4l2_dev);
	if (res < 0) {
	release_region(fmi->io, 2);
	pnp_device_detach(dev);
	v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
	return res;
	}

	strlcpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name));
	fmi->vdev.v4l2_dev = v4l2_dev;
	fmi->vdev.fops = &fmi_fops;
	fmi->vdev.ioctl_ops = &fmi_ioctl_ops;
	fmi->vdev.release = video_device_release_empty;
	video_set_drvdata(&fmi->vdev, fmi);

	mutex_init(&fmi->lock);

	if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
	v4l2_device_unregister(v4l2_dev);
	release_region(fmi->io, 2);
	pnp_device_detach(dev);
	return -EINVAL;
	}

	v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io);
	/* mute card - prevents noisy bootups */
	fmi_mute(fmi);
	return 0;
	}

	static void __exit fmi_exit(void)
	{
	struct fmi *fmi = &fmi_card;

	video_unregister_device(&fmi->vdev);
	v4l2_device_unregister(&fmi->v4l2_dev);
	release_region(fmi->io, 2);
	if (dev)
	pnp_device_detach(dev);
	}

	module_init(fmi_init);
	module_exit(fmi_exit);