drivers/media/radio/radio-sf16fmr2.c - kernel/msm-5.4 - Gitiles

 /* SF16FMR2 radio driver for Linux radio support
  * heavily based on fmi driver...
  * (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
  *
  * 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
  *
  *  For read stereo/mono you must wait 0.1 sec after set frequency and
  *  card unmuted so I set frequency on unmute
  *  Signal handling seem to work only on autoscanning (not implemented)
  *
  *  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/delay.h>	/* udelay			*/
 #include <linux/videodev2.h>	/* kernel radio structs		*/
 #include <linux/mutex.h>
 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
 #include <linux/io.h>		/* outb, outb_p			*/
 #include <media/v4l2-device.h>
 #include <media/v4l2-ioctl.h>

 MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
 MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
 MODULE_LICENSE("GPL");

 static int io = 0x384;
 static int radio_nr = -1;

 module_param(io, int, 0);
 MODULE_PARM_DESC(io, "I/O address of the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
 module_param(radio_nr, int, 0);

 #define RADIO_VERSION KERNEL_VERSION(0,0,2)

 #define AUD_VOL_INDEX 1

 #undef DEBUG
 //#define DEBUG 1

 #ifdef DEBUG
 # define  debug_print(s) printk s
 #else
 # define  debug_print(s)
 #endif

 /* this should be static vars for module size */
 struct fmr2
 {
 	struct v4l2_device v4l2_dev;
 	struct video_device vdev;
 	struct mutex lock;
 	int io;
 	int curvol; /* 0-15 */
 	int mute;
 	int stereo; /* card is producing stereo audio */
 	unsigned long curfreq; /* freq in kHz */
 	int card_type;
 	u32 flags;
 };

 static struct fmr2 fmr2_card;

 /* hw precision is 12.5 kHz
  * It is only useful to give freq in intervall of 200 (=0.0125Mhz),
  * other bits will be truncated
  */
 #define RSF16_ENCODE(x)	((x) / 200 + 856)
 #define RSF16_MINFREQ (87 * 16000)
 #define RSF16_MAXFREQ (108 * 16000)

 static inline void wait(int n, int io)
 {
 	for (; n; --n)
 		inb(io);
 }

 static void outbits(int bits, unsigned int data, int nWait, int io)
 {
 	int bit;

 	for (; --bits >= 0;) {
 		bit = (data >> bits) & 1;
 		outb(bit, io);
 		wait(nWait, io);
 		outb(bit | 2, io);
 		wait(nWait, io);
 		outb(bit, io);
 		wait(nWait, io);
 	}
 }

 static inline void fmr2_mute(int io)
 {
 	outb(0x00, io);
 	wait(4, io);
 }

 static inline void fmr2_unmute(int io)
 {
 	outb(0x04, io);
 	wait(4, io);
 }

 static inline int fmr2_stereo_mode(int io)
 {
 	int n = inb(io);

 	outb(6, io);
 	inb(io);
 	n = ((n >> 3) & 1) ^ 1;
 	debug_print((KERN_DEBUG "stereo: %d\n", n));
 	return n;
 }

 static int fmr2_product_info(struct fmr2 *dev)
 {
 	int n = inb(dev->io);

 	n &= 0xC1;
 	if (n == 0) {
 		/* this should support volume set */
 		dev->card_type = 12;
 		return 0;
 	}
 	/* not volume (mine is 11) */
 	dev->card_type = (n == 128) ? 11 : 0;
 	return n;
 }

 static inline int fmr2_getsigstr(struct fmr2 *dev)
 {
 	/* !!! works only if scanning freq */
 	int res = 0xffff;

 	outb(5, dev->io);
 	wait(4, dev->io);
 	if (!(inb(dev->io) & 1))
 		res = 0;
 	debug_print((KERN_DEBUG "signal: %d\n", res));
 	return res;
 }

 /* set frequency and unmute card */
 static int fmr2_setfreq(struct fmr2 *dev)
 {
 	unsigned long freq = dev->curfreq;

 	fmr2_mute(dev->io);

 	/* 0x42 for mono output
 	 * 0x102 forward scanning
 	 * 0x182 scansione avanti
 	 */
 	outbits(9, 0x2, 3, dev->io);
 	outbits(16, RSF16_ENCODE(freq), 2, dev->io);

 	fmr2_unmute(dev->io);

 	/* wait 0.11 sec */
 	msleep(110);

 	/* NOTE if mute this stop radio
 	   you must set freq on unmute */
 	dev->stereo = fmr2_stereo_mode(dev->io);
 	return 0;
 }

 /* !!! not tested, in my card this does't work !!! */
 static int fmr2_setvolume(struct fmr2 *dev)
 {
 	int vol[16] = { 0x021, 0x084, 0x090, 0x104,
 			0x110, 0x204, 0x210, 0x402,
 			0x404, 0x408, 0x410, 0x801,
 			0x802, 0x804, 0x808, 0x810 };
 	int i, a;
 	int n = vol[dev->curvol & 0x0f];

 	if (dev->card_type != 11)
 		return 1;

 	for (i = 12; --i >= 0; ) {
 		a = ((n >> i) & 1) << 6; /* if (a==0) a = 0; else a = 0x40; */
 		outb(a | 4, dev->io);
 		wait(4, dev->io);
 		outb(a | 0x24, dev->io);
 		wait(4, dev->io);
 		outb(a | 4, dev->io);
 		wait(4, dev->io);
 	}
 	for (i = 6; --i >= 0; ) {
 		a = ((0x18 >> i) & 1) << 6;
 		outb(a | 4, dev->io);
 		wait(4, dev->io);
 		outb(a | 0x24, dev->io);
 		wait(4, dev->io);
 		outb(a | 4, dev->io);
 		wait(4, dev->io);
 	}
 	wait(4, dev->io);
 	outb(0x14, dev->io);
 	return 0;
 }

 static int vidioc_querycap(struct file *file, void  *priv,
 					struct v4l2_capability *v)
 {
 	strlcpy(v->driver, "radio-sf16fmr2", sizeof(v->driver));
 	strlcpy(v->card, "SF16-FMR2 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)
 {
 	int mult;
 	struct fmr2 *fmr2 = video_drvdata(file);

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

 	strlcpy(v->name, "FM", sizeof(v->name));
 	v->type = V4L2_TUNER_RADIO;

 	mult = (fmr2->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
 	v->rangelow = RSF16_MINFREQ / mult;
 	v->rangehigh = RSF16_MAXFREQ / mult;
 	v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
 	v->capability = fmr2->flags&V4L2_TUNER_CAP_LOW;
 	v->audmode = fmr2->stereo ? V4L2_TUNER_MODE_STEREO:
 				V4L2_TUNER_MODE_MONO;
 	mutex_lock(&fmr2->lock);
 	v->signal = fmr2_getsigstr(fmr2);
 	mutex_unlock(&fmr2->lock);
 	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 fmr2 *fmr2 = video_drvdata(file);

 	if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
 		f->frequency *= 1000;
 	if (f->frequency < RSF16_MINFREQ ||
 			f->frequency > RSF16_MAXFREQ)
 		return -EINVAL;
 	/* rounding in steps of 200 to match the freq
 	   that will be used */
 	fmr2->curfreq = (f->frequency / 200) * 200;

 	/* set card freq (if not muted) */
 	if (fmr2->curvol && !fmr2->mute) {
 		mutex_lock(&fmr2->lock);
 		fmr2_setfreq(fmr2);
 		mutex_unlock(&fmr2->lock);
 	}
 	return 0;
 }

 static int vidioc_g_frequency(struct file *file, void *priv,
 					struct v4l2_frequency *f)
 {
 	struct fmr2 *fmr2 = video_drvdata(file);

 	f->type = V4L2_TUNER_RADIO;
 	f->frequency = fmr2->curfreq;
 	if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
 		f->frequency /= 1000;
 	return 0;
 }

 static int vidioc_queryctrl(struct file *file, void *priv,
 					struct v4l2_queryctrl *qc)
 {
 	struct fmr2 *fmr2 = video_drvdata(file);

 	switch (qc->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 	case V4L2_CID_AUDIO_VOLUME:
 		/* Only card_type == 11 implements volume */
 		if (fmr2->card_type == 11)
 			return v4l2_ctrl_query_fill(qc, 0, 15, 1, 0);
 		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
 	}
 	return -EINVAL;
 }

 static int vidioc_g_ctrl(struct file *file, void *priv,
 					struct v4l2_control *ctrl)
 {
 	struct fmr2 *fmr2 = video_drvdata(file);

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		ctrl->value = fmr2->mute;
 		return 0;
 	case V4L2_CID_AUDIO_VOLUME:
 		ctrl->value = fmr2->curvol;
 		return 0;
 	}
 	return -EINVAL;
 }

 static int vidioc_s_ctrl(struct file *file, void *priv,
 					struct v4l2_control *ctrl)
 {
 	struct fmr2 *fmr2 = video_drvdata(file);

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		fmr2->mute = ctrl->value;
 		break;
 	case V4L2_CID_AUDIO_VOLUME:
 		fmr2->curvol = ctrl->value;
 		break;
 	default:
 		return -EINVAL;
 	}

 #ifdef DEBUG
 	if (fmr2->curvol && !fmr2->mute)
 		printk(KERN_DEBUG "unmute\n");
 	else
 		printk(KERN_DEBUG "mute\n");
 #endif

 	mutex_lock(&fmr2->lock);
 	if (fmr2->curvol && !fmr2->mute) {
 		fmr2_setvolume(fmr2);
 		/* Set frequency and unmute card */
 		fmr2_setfreq(fmr2);
 	} else
 		fmr2_mute(fmr2->io);
 	mutex_unlock(&fmr2->lock);
 	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)
 {
 	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 int fmr2_open(struct file *file)
 {
 	return 0;
 }

 static int fmr2_release(struct file *file)
 {
 	return 0;
 }

 static const struct v4l2_file_operations fmr2_fops = {
 	.owner          = THIS_MODULE,
 	.open           = fmr2_open,
 	.release        = fmr2_release,
 	.ioctl          = video_ioctl2,
 };

 static const struct v4l2_ioctl_ops fmr2_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 int __init fmr2_init(void)
 {
 	struct fmr2 *fmr2 = &fmr2_card;
 	struct v4l2_device *v4l2_dev = &fmr2->v4l2_dev;
 	int res;

 	strlcpy(v4l2_dev->name, "sf16fmr2", sizeof(v4l2_dev->name));
 	fmr2->io = io;
 	fmr2->stereo = 1;
 	fmr2->flags = V4L2_TUNER_CAP_LOW;
 	mutex_init(&fmr2->lock);

 	if (!request_region(fmr2->io, 2, "sf16fmr2")) {
 		v4l2_err(v4l2_dev, "request_region failed!\n");
 		return -EBUSY;
 	}

 	res = v4l2_device_register(NULL, v4l2_dev);
 	if (res < 0) {
 		release_region(fmr2->io, 2);
 		v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 		return res;
 	}

 	strlcpy(fmr2->vdev.name, v4l2_dev->name, sizeof(fmr2->vdev.name));
 	fmr2->vdev.v4l2_dev = v4l2_dev;
 	fmr2->vdev.fops = &fmr2_fops;
 	fmr2->vdev.ioctl_ops = &fmr2_ioctl_ops;
 	fmr2->vdev.release = video_device_release_empty;
 	video_set_drvdata(&fmr2->vdev, fmr2);

 	if (video_register_device(&fmr2->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 		v4l2_device_unregister(v4l2_dev);
 		release_region(fmr2->io, 2);
 		return -EINVAL;
 	}

 	v4l2_info(v4l2_dev, "SF16FMR2 radio card driver at 0x%x.\n", fmr2->io);
 	/* mute card - prevents noisy bootups */
 	mutex_lock(&fmr2->lock);
 	fmr2_mute(fmr2->io);
 	fmr2_product_info(fmr2);
 	mutex_unlock(&fmr2->lock);
 	debug_print((KERN_DEBUG "card_type %d\n", fmr2->card_type));
 	return 0;
 }

 static void __exit fmr2_exit(void)
 {
 	struct fmr2 *fmr2 = &fmr2_card;

 	video_unregister_device(&fmr2->vdev);
 	v4l2_device_unregister(&fmr2->v4l2_dev);
 	release_region(fmr2->io, 2);
 }

 module_init(fmr2_init);
 module_exit(fmr2_exit);

 #ifndef MODULE

 static int __init fmr2_setup_io(char *str)
 {
 	get_option(&str, &io);
 	return 1;
 }

 __setup("sf16fmr2=", fmr2_setup_io);

 #endif
	/* SF16FMR2 radio driver for Linux radio support
	* heavily based on fmi driver...
	* (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
	*
	* 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
	*
	* For read stereo/mono you must wait 0.1 sec after set frequency and
	* card unmuted so I set frequency on unmute
	* Signal handling seem to work only on autoscanning (not implemented)
	*
	* 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/delay.h> /* udelay */
	#include <linux/videodev2.h> /* kernel radio structs */
	#include <linux/mutex.h>
	#include <linux/version.h> /* for KERNEL_VERSION MACRO */
	#include <linux/io.h> /* outb, outb_p */
	#include <media/v4l2-device.h>
	#include <media/v4l2-ioctl.h>

	MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
	MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
	MODULE_LICENSE("GPL");

	static int io = 0x384;
	static int radio_nr = -1;

	module_param(io, int, 0);
	MODULE_PARM_DESC(io, "I/O address of the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
	module_param(radio_nr, int, 0);

	#define RADIO_VERSION KERNEL_VERSION(0,0,2)

	#define AUD_VOL_INDEX 1

	#undef DEBUG
	//#define DEBUG 1

	#ifdef DEBUG
	# define debug_print(s) printk s
	#else
	# define debug_print(s)
	#endif

	/* this should be static vars for module size */
	struct fmr2
	{
	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	struct mutex lock;
	int io;
	int curvol; /* 0-15 */
	int mute;
	int stereo; /* card is producing stereo audio */
	unsigned long curfreq; /* freq in kHz */
	int card_type;
	u32 flags;
	};

	static struct fmr2 fmr2_card;

	/* hw precision is 12.5 kHz
	* It is only useful to give freq in intervall of 200 (=0.0125Mhz),
	* other bits will be truncated
	*/
	#define RSF16_ENCODE(x) ((x) / 200 + 856)
	#define RSF16_MINFREQ (87 * 16000)
	#define RSF16_MAXFREQ (108 * 16000)

	static inline void wait(int n, int io)
	{
	for (; n; --n)
	inb(io);
	}

	static void outbits(int bits, unsigned int data, int nWait, int io)
	{
	int bit;

	for (; --bits >= 0;) {
	bit = (data >> bits) & 1;
	outb(bit, io);
	wait(nWait, io);
	outb(bit \| 2, io);
	wait(nWait, io);
	outb(bit, io);
	wait(nWait, io);
	}
	}

	static inline void fmr2_mute(int io)
	{
	outb(0x00, io);
	wait(4, io);
	}

	static inline void fmr2_unmute(int io)
	{
	outb(0x04, io);
	wait(4, io);
	}

	static inline int fmr2_stereo_mode(int io)
	{
	int n = inb(io);

	outb(6, io);
	inb(io);
	n = ((n >> 3) & 1) ^ 1;
	debug_print((KERN_DEBUG "stereo: %d\n", n));
	return n;
	}

	static int fmr2_product_info(struct fmr2 *dev)
	{
	int n = inb(dev->io);

	n &= 0xC1;
	if (n == 0) {
	/* this should support volume set */
	dev->card_type = 12;
	return 0;
	}
	/* not volume (mine is 11) */
	dev->card_type = (n == 128) ? 11 : 0;
	return n;
	}

	static inline int fmr2_getsigstr(struct fmr2 *dev)
	{
	/* !!! works only if scanning freq */
	int res = 0xffff;

	outb(5, dev->io);
	wait(4, dev->io);
	if (!(inb(dev->io) & 1))
	res = 0;
	debug_print((KERN_DEBUG "signal: %d\n", res));
	return res;
	}

	/* set frequency and unmute card */
	static int fmr2_setfreq(struct fmr2 *dev)
	{
	unsigned long freq = dev->curfreq;

	fmr2_mute(dev->io);

	/* 0x42 for mono output
	* 0x102 forward scanning
	* 0x182 scansione avanti
	*/
	outbits(9, 0x2, 3, dev->io);
	outbits(16, RSF16_ENCODE(freq), 2, dev->io);

	fmr2_unmute(dev->io);

	/* wait 0.11 sec */
	msleep(110);

	/* NOTE if mute this stop radio
	you must set freq on unmute */
	dev->stereo = fmr2_stereo_mode(dev->io);
	return 0;
	}

	/* !!! not tested, in my card this does't work !!! */
	static int fmr2_setvolume(struct fmr2 *dev)
	{
	int vol[16] = { 0x021, 0x084, 0x090, 0x104,
	0x110, 0x204, 0x210, 0x402,
	0x404, 0x408, 0x410, 0x801,
	0x802, 0x804, 0x808, 0x810 };
	int i, a;
	int n = vol[dev->curvol & 0x0f];

	if (dev->card_type != 11)
	return 1;

	for (i = 12; --i >= 0; ) {
	a = ((n >> i) & 1) << 6; /* if (a==0) a = 0; else a = 0x40; */
	outb(a \| 4, dev->io);
	wait(4, dev->io);
	outb(a \| 0x24, dev->io);
	wait(4, dev->io);
	outb(a \| 4, dev->io);
	wait(4, dev->io);
	}
	for (i = 6; --i >= 0; ) {
	a = ((0x18 >> i) & 1) << 6;
	outb(a \| 4, dev->io);
	wait(4, dev->io);
	outb(a \| 0x24, dev->io);
	wait(4, dev->io);
	outb(a \| 4, dev->io);
	wait(4, dev->io);
	}
	wait(4, dev->io);
	outb(0x14, dev->io);
	return 0;
	}

	static int vidioc_querycap(struct file file, void priv,
	struct v4l2_capability *v)
	{
	strlcpy(v->driver, "radio-sf16fmr2", sizeof(v->driver));
	strlcpy(v->card, "SF16-FMR2 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)
	{
	int mult;
	struct fmr2 *fmr2 = video_drvdata(file);

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

	strlcpy(v->name, "FM", sizeof(v->name));
	v->type = V4L2_TUNER_RADIO;

	mult = (fmr2->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
	v->rangelow = RSF16_MINFREQ / mult;
	v->rangehigh = RSF16_MAXFREQ / mult;
	v->rxsubchans = V4L2_TUNER_SUB_MONO \| V4L2_TUNER_MODE_STEREO;
	v->capability = fmr2->flags&V4L2_TUNER_CAP_LOW;
	v->audmode = fmr2->stereo ? V4L2_TUNER_MODE_STEREO:
	V4L2_TUNER_MODE_MONO;
	mutex_lock(&fmr2->lock);
	v->signal = fmr2_getsigstr(fmr2);
	mutex_unlock(&fmr2->lock);
	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 fmr2 *fmr2 = video_drvdata(file);

	if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
	f->frequency *= 1000;
	if (f->frequency < RSF16_MINFREQ \|\|
	f->frequency > RSF16_MAXFREQ)
	return -EINVAL;
	/* rounding in steps of 200 to match the freq
	that will be used */
	fmr2->curfreq = (f->frequency / 200) * 200;

	/* set card freq (if not muted) */
	if (fmr2->curvol && !fmr2->mute) {
	mutex_lock(&fmr2->lock);
	fmr2_setfreq(fmr2);
	mutex_unlock(&fmr2->lock);
	}
	return 0;
	}

	static int vidioc_g_frequency(struct file file, void priv,
	struct v4l2_frequency *f)
	{
	struct fmr2 *fmr2 = video_drvdata(file);

	f->type = V4L2_TUNER_RADIO;
	f->frequency = fmr2->curfreq;
	if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
	f->frequency /= 1000;
	return 0;
	}

	static int vidioc_queryctrl(struct file file, void priv,
	struct v4l2_queryctrl *qc)
	{
	struct fmr2 *fmr2 = video_drvdata(file);

	switch (qc->id) {
	case V4L2_CID_AUDIO_MUTE:
	return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
	case V4L2_CID_AUDIO_VOLUME:
	/* Only card_type == 11 implements volume */
	if (fmr2->card_type == 11)
	return v4l2_ctrl_query_fill(qc, 0, 15, 1, 0);
	return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
	}
	return -EINVAL;
	}

	static int vidioc_g_ctrl(struct file file, void priv,
	struct v4l2_control *ctrl)
	{
	struct fmr2 *fmr2 = video_drvdata(file);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	ctrl->value = fmr2->mute;
	return 0;
	case V4L2_CID_AUDIO_VOLUME:
	ctrl->value = fmr2->curvol;
	return 0;
	}
	return -EINVAL;
	}

	static int vidioc_s_ctrl(struct file file, void priv,
	struct v4l2_control *ctrl)
	{
	struct fmr2 *fmr2 = video_drvdata(file);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	fmr2->mute = ctrl->value;
	break;
	case V4L2_CID_AUDIO_VOLUME:
	fmr2->curvol = ctrl->value;
	break;
	default:
	return -EINVAL;
	}

	#ifdef DEBUG
	if (fmr2->curvol && !fmr2->mute)
	printk(KERN_DEBUG "unmute\n");
	else
	printk(KERN_DEBUG "mute\n");
	#endif

	mutex_lock(&fmr2->lock);
	if (fmr2->curvol && !fmr2->mute) {
	fmr2_setvolume(fmr2);
	/* Set frequency and unmute card */
	fmr2_setfreq(fmr2);
	} else
	fmr2_mute(fmr2->io);
	mutex_unlock(&fmr2->lock);
	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)
	{
	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 int fmr2_open(struct file *file)
	{
	return 0;
	}

	static int fmr2_release(struct file *file)
	{
	return 0;
	}

	static const struct v4l2_file_operations fmr2_fops = {
	.owner = THIS_MODULE,
	.open = fmr2_open,
	.release = fmr2_release,
	.ioctl = video_ioctl2,
	};

	static const struct v4l2_ioctl_ops fmr2_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 int __init fmr2_init(void)
	{
	struct fmr2 *fmr2 = &fmr2_card;
	struct v4l2_device *v4l2_dev = &fmr2->v4l2_dev;
	int res;

	strlcpy(v4l2_dev->name, "sf16fmr2", sizeof(v4l2_dev->name));
	fmr2->io = io;
	fmr2->stereo = 1;
	fmr2->flags = V4L2_TUNER_CAP_LOW;
	mutex_init(&fmr2->lock);

	if (!request_region(fmr2->io, 2, "sf16fmr2")) {
	v4l2_err(v4l2_dev, "request_region failed!\n");
	return -EBUSY;
	}

	res = v4l2_device_register(NULL, v4l2_dev);
	if (res < 0) {
	release_region(fmr2->io, 2);
	v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
	return res;
	}

	strlcpy(fmr2->vdev.name, v4l2_dev->name, sizeof(fmr2->vdev.name));
	fmr2->vdev.v4l2_dev = v4l2_dev;
	fmr2->vdev.fops = &fmr2_fops;
	fmr2->vdev.ioctl_ops = &fmr2_ioctl_ops;
	fmr2->vdev.release = video_device_release_empty;
	video_set_drvdata(&fmr2->vdev, fmr2);

	if (video_register_device(&fmr2->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
	v4l2_device_unregister(v4l2_dev);
	release_region(fmr2->io, 2);
	return -EINVAL;
	}

	v4l2_info(v4l2_dev, "SF16FMR2 radio card driver at 0x%x.\n", fmr2->io);
	/* mute card - prevents noisy bootups */
	mutex_lock(&fmr2->lock);
	fmr2_mute(fmr2->io);
	fmr2_product_info(fmr2);
	mutex_unlock(&fmr2->lock);
	debug_print((KERN_DEBUG "card_type %d\n", fmr2->card_type));
	return 0;
	}

	static void __exit fmr2_exit(void)
	{
	struct fmr2 *fmr2 = &fmr2_card;

	video_unregister_device(&fmr2->vdev);
	v4l2_device_unregister(&fmr2->v4l2_dev);
	release_region(fmr2->io, 2);
	}

	module_init(fmr2_init);
	module_exit(fmr2_exit);

	#ifndef MODULE

	static int __init fmr2_setup_io(char *str)
	{
	get_option(&str, &io);
	return 1;
	}

	__setup("sf16fmr2=", fmr2_setup_io);

	#endif