drivers/media/radio/radio-gemtek.c - kernel/msm-4.9 - Gitiles

 /* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
  *
  * GemTek hasn't released any specs on the card, so the protocol had to
  * be reverse engineered with dosemu.
  *
  * Besides the protocol changes, this is mostly a copy of:
  *
  *    RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
  *
  *    Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
  *    Converted to new API by Alan Cox <Alan.Cox@linux.org>
  *    Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
  *
  * TODO: Allow for more than one of these foolish entities :-)
  *
  */

 #include <linux/module.h>	/* Modules 			*/
 #include <linux/init.h>		/* Initdata			*/
 #include <linux/ioport.h>	/* request_region		*/
 #include <linux/delay.h>	/* udelay			*/
 #include <asm/io.h>		/* outb, outb_p			*/
 #include <asm/uaccess.h>	/* copy to/from user		*/
 #include <linux/videodev.h>	/* kernel radio structs		*/
 #include <media/v4l2-common.h>
 #include <linux/config.h>	/* CONFIG_RADIO_GEMTEK_PORT 	*/
 #include <linux/spinlock.h>

 #ifndef CONFIG_RADIO_GEMTEK_PORT
 #define CONFIG_RADIO_GEMTEK_PORT -1
 #endif

 static int io = CONFIG_RADIO_GEMTEK_PORT;
 static int radio_nr = -1;
 static spinlock_t lock;

 struct gemtek_device
 {
 	int port;
 	unsigned long curfreq;
 	int muted;
 };


 /* local things */

 /* the correct way to mute the gemtek may be to write the last written
  * frequency || 0x10, but just writing 0x10 once seems to do it as well
  */
 static void gemtek_mute(struct gemtek_device *dev)
 {
 	if(dev->muted)
 		return;
 	spin_lock(&lock);
 	outb(0x10, io);
 	spin_unlock(&lock);
 	dev->muted = 1;
 }

 static void gemtek_unmute(struct gemtek_device *dev)
 {
 	if(dev->muted == 0)
 		return;
 	spin_lock(&lock);
 	outb(0x20, io);
 	spin_unlock(&lock);
 	dev->muted = 0;
 }

 static void zero(void)
 {
 	outb_p(0x04, io);
 	udelay(5);
 	outb_p(0x05, io);
 	udelay(5);
 }

 static void one(void)
 {
 	outb_p(0x06, io);
 	udelay(5);
 	outb_p(0x07, io);
 	udelay(5);
 }

 static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
 {
 	int i;

 /*        freq = 78.25*((float)freq/16000.0 + 10.52); */

 	freq /= 16;
 	freq += 10520;
 	freq *= 7825;
 	freq /= 100000;

 	spin_lock(&lock);

 	/* 2 start bits */
 	outb_p(0x03, io);
 	udelay(5);
 	outb_p(0x07, io);
 	udelay(5);

 	/* 28 frequency bits (lsb first) */
 	for (i = 0; i < 14; i++)
 		if (freq & (1 << i))
 			one();
 		else
 			zero();
 	/* 36 unknown bits */
 	for (i = 0; i < 11; i++)
 		zero();
 	one();
 	for (i = 0; i < 4; i++)
 		zero();
 	one();
 	zero();

 	/* 2 end bits */
 	outb_p(0x03, io);
 	udelay(5);
 	outb_p(0x07, io);
 	udelay(5);

 	spin_unlock(&lock);

 	return 0;
 }

 static int gemtek_getsigstr(struct gemtek_device *dev)
 {
 	spin_lock(&lock);
 	inb(io);
 	udelay(5);
 	spin_unlock(&lock);
 	if (inb(io) & 8)		/* bit set = no signal present */
 		return 0;
 	return 1;		/* signal present */
 }

 static int gemtek_do_ioctl(struct inode *inode, struct file *file,
 			   unsigned int cmd, void *arg)
 {
 	struct video_device *dev = video_devdata(file);
 	struct gemtek_device *rt=dev->priv;

 	switch(cmd)
 	{
 		case VIDIOCGCAP:
 		{
 			struct video_capability *v = arg;
 			memset(v,0,sizeof(*v));
 			v->type=VID_TYPE_TUNER;
 			v->channels=1;
 			v->audios=1;
 			strcpy(v->name, "GemTek");
 			return 0;
 		}
 		case VIDIOCGTUNER:
 		{
 			struct video_tuner *v = arg;
 			if(v->tuner)	/* Only 1 tuner */
 				return -EINVAL;
 			v->rangelow=87*16000;
 			v->rangehigh=108*16000;
 			v->flags=VIDEO_TUNER_LOW;
 			v->mode=VIDEO_MODE_AUTO;
 			v->signal=0xFFFF*gemtek_getsigstr(rt);
 			strcpy(v->name, "FM");
 			return 0;
 		}
 		case VIDIOCSTUNER:
 		{
 			struct video_tuner *v = arg;
 			if(v->tuner!=0)
 				return -EINVAL;
 			/* Only 1 tuner so no setting needed ! */
 			return 0;
 		}
 		case VIDIOCGFREQ:
 		{
 			unsigned long *freq = arg;
 			*freq = rt->curfreq;
 			return 0;
 		}
 		case VIDIOCSFREQ:
 		{
 			unsigned long *freq = arg;
 			rt->curfreq = *freq;
 			/* needs to be called twice in order for getsigstr to work */
 			gemtek_setfreq(rt, rt->curfreq);
 			gemtek_setfreq(rt, rt->curfreq);
 			return 0;
 		}
 		case VIDIOCGAUDIO:
 		{
 			struct video_audio *v = arg;
 			memset(v,0, sizeof(*v));
 			v->flags|=VIDEO_AUDIO_MUTABLE;
 			v->volume=1;
 			v->step=65535;
 			strcpy(v->name, "Radio");
 			return 0;
 		}
 		case VIDIOCSAUDIO:
 		{
 			struct video_audio *v = arg;
 			if(v->audio)
 				return -EINVAL;

 			if(v->flags&VIDEO_AUDIO_MUTE)
 				gemtek_mute(rt);
 			else
 				gemtek_unmute(rt);

 			return 0;
 		}
 		default:
 			return -ENOIOCTLCMD;
 	}
 }

 static int gemtek_ioctl(struct inode *inode, struct file *file,
 			unsigned int cmd, unsigned long arg)
 {
 	return video_usercopy(inode, file, cmd, arg, gemtek_do_ioctl);
 }

 static struct gemtek_device gemtek_unit;

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

 static struct video_device gemtek_radio=
 {
 	.owner		= THIS_MODULE,
 	.name		= "GemTek radio",
 	.type		= VID_TYPE_TUNER,
 	.hardware	= VID_HARDWARE_GEMTEK,
 	.fops           = &gemtek_fops,
 };

 static int __init gemtek_init(void)
 {
 	if(io==-1)
 	{
 		printk(KERN_ERR "You must set an I/O address with io=0x20c, io=0x30c, io=0x24c or io=0x34c (io=0x020c or io=0x248 for the combined sound/radiocard)\n");
 		return -EINVAL;
 	}

 	if (!request_region(io, 4, "gemtek"))
 	{
 		printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
 		return -EBUSY;
 	}

 	gemtek_radio.priv=&gemtek_unit;

 	if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 	{
 		release_region(io, 4);
 		return -EINVAL;
 	}
 	printk(KERN_INFO "GemTek Radio Card driver.\n");

 	spin_lock_init(&lock);

 	/* this is _maybe_ unnecessary */
 	outb(0x01, io);

 	/* mute card - prevents noisy bootups */
 	gemtek_unit.muted = 0;
 	gemtek_mute(&gemtek_unit);

 	return 0;
 }

 MODULE_AUTHOR("Jonas Munsin");
 MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
 MODULE_LICENSE("GPL");

 module_param(io, int, 0);
 MODULE_PARM_DESC(io, "I/O address of the GemTek card (0x20c, 0x30c, 0x24c or 0x34c (0x20c or 0x248 have been reported to work for the combined sound/radiocard)).");
 module_param(radio_nr, int, 0);

 static void __exit gemtek_cleanup(void)
 {
 	video_unregister_device(&gemtek_radio);
 	release_region(io,4);
 }

 module_init(gemtek_init);
 module_exit(gemtek_cleanup);

 /*
   Local variables:
   compile-command: "gcc -c -DMODVERSIONS -D__KERNEL__ -DMODULE -O6 -Wall -Wstrict-prototypes -I /home/blp/tmp/linux-2.1.111-rtrack/include radio-rtrack2.c"
   End:
 */
	/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
	*
	* GemTek hasn't released any specs on the card, so the protocol had to
	* be reverse engineered with dosemu.
	*
	* Besides the protocol changes, this is mostly a copy of:
	*
	* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
	*
	* Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
	* Converted to new API by Alan Cox <Alan.Cox@linux.org>
	* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
	*
	* TODO: Allow for more than one of these foolish entities :-)
	*
	*/

	#include <linux/module.h> /* Modules */
	#include <linux/init.h> /* Initdata */
	#include <linux/ioport.h> /* request_region */
	#include <linux/delay.h> /* udelay */
	#include <asm/io.h> /* outb, outb_p */
	#include <asm/uaccess.h> /* copy to/from user */
	#include <linux/videodev.h> /* kernel radio structs */
	#include <media/v4l2-common.h>
	#include <linux/config.h> /* CONFIG_RADIO_GEMTEK_PORT */
	#include <linux/spinlock.h>

	#ifndef CONFIG_RADIO_GEMTEK_PORT
	#define CONFIG_RADIO_GEMTEK_PORT -1
	#endif

	static int io = CONFIG_RADIO_GEMTEK_PORT;
	static int radio_nr = -1;
	static spinlock_t lock;

	struct gemtek_device
	{
	int port;
	unsigned long curfreq;
	int muted;
	};


	/* local things */

	/* the correct way to mute the gemtek may be to write the last written
	* frequency \|\| 0x10, but just writing 0x10 once seems to do it as well
	*/
	static void gemtek_mute(struct gemtek_device *dev)
	{
	if(dev->muted)
	return;
	spin_lock(&lock);
	outb(0x10, io);
	spin_unlock(&lock);
	dev->muted = 1;
	}

	static void gemtek_unmute(struct gemtek_device *dev)
	{
	if(dev->muted == 0)
	return;
	spin_lock(&lock);
	outb(0x20, io);
	spin_unlock(&lock);
	dev->muted = 0;
	}

	static void zero(void)
	{
	outb_p(0x04, io);
	udelay(5);
	outb_p(0x05, io);
	udelay(5);
	}

	static void one(void)
	{
	outb_p(0x06, io);
	udelay(5);
	outb_p(0x07, io);
	udelay(5);
	}

	static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
	{
	int i;

	/* freq = 78.25((float)freq/16000.0 + 10.52); /

	freq /= 16;
	freq += 10520;
	freq *= 7825;
	freq /= 100000;

	spin_lock(&lock);

	/* 2 start bits */
	outb_p(0x03, io);
	udelay(5);
	outb_p(0x07, io);
	udelay(5);

	/* 28 frequency bits (lsb first) */
	for (i = 0; i < 14; i++)
	if (freq & (1 << i))
	one();
	else
	zero();
	/* 36 unknown bits */
	for (i = 0; i < 11; i++)
	zero();
	one();
	for (i = 0; i < 4; i++)
	zero();
	one();
	zero();

	/* 2 end bits */
	outb_p(0x03, io);
	udelay(5);
	outb_p(0x07, io);
	udelay(5);

	spin_unlock(&lock);

	return 0;
	}

	static int gemtek_getsigstr(struct gemtek_device *dev)
	{
	spin_lock(&lock);
	inb(io);
	udelay(5);
	spin_unlock(&lock);
	if (inb(io) & 8) /* bit set = no signal present */
	return 0;
	return 1; /* signal present */
	}

	static int gemtek_do_ioctl(struct inode inode, struct file file,
	unsigned int cmd, void *arg)
	{
	struct video_device *dev = video_devdata(file);
	struct gemtek_device *rt=dev->priv;

	switch(cmd)
	{
	case VIDIOCGCAP:
	{
	struct video_capability *v = arg;
	memset(v,0,sizeof(*v));
	v->type=VID_TYPE_TUNER;
	v->channels=1;
	v->audios=1;
	strcpy(v->name, "GemTek");
	return 0;
	}
	case VIDIOCGTUNER:
	{
	struct video_tuner *v = arg;
	if(v->tuner) /* Only 1 tuner */
	return -EINVAL;
	v->rangelow=87*16000;
	v->rangehigh=108*16000;
	v->flags=VIDEO_TUNER_LOW;
	v->mode=VIDEO_MODE_AUTO;
	v->signal=0xFFFF*gemtek_getsigstr(rt);
	strcpy(v->name, "FM");
	return 0;
	}
	case VIDIOCSTUNER:
	{
	struct video_tuner *v = arg;
	if(v->tuner!=0)
	return -EINVAL;
	/* Only 1 tuner so no setting needed ! */
	return 0;
	}
	case VIDIOCGFREQ:
	{
	unsigned long *freq = arg;
	*freq = rt->curfreq;
	return 0;
	}
	case VIDIOCSFREQ:
	{
	unsigned long *freq = arg;
	rt->curfreq = *freq;
	/* needs to be called twice in order for getsigstr to work */
	gemtek_setfreq(rt, rt->curfreq);
	gemtek_setfreq(rt, rt->curfreq);
	return 0;
	}
	case VIDIOCGAUDIO:
	{
	struct video_audio *v = arg;
	memset(v,0, sizeof(*v));
	v->flags\|=VIDEO_AUDIO_MUTABLE;
	v->volume=1;
	v->step=65535;
	strcpy(v->name, "Radio");
	return 0;
	}
	case VIDIOCSAUDIO:
	{
	struct video_audio *v = arg;
	if(v->audio)
	return -EINVAL;

	if(v->flags&VIDEO_AUDIO_MUTE)
	gemtek_mute(rt);
	else
	gemtek_unmute(rt);

	return 0;
	}
	default:
	return -ENOIOCTLCMD;
	}
	}

	static int gemtek_ioctl(struct inode inode, struct file file,
	unsigned int cmd, unsigned long arg)
	{
	return video_usercopy(inode, file, cmd, arg, gemtek_do_ioctl);
	}

	static struct gemtek_device gemtek_unit;

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

	static struct video_device gemtek_radio=
	{
	.owner = THIS_MODULE,
	.name = "GemTek radio",
	.type = VID_TYPE_TUNER,
	.hardware = VID_HARDWARE_GEMTEK,
	.fops = &gemtek_fops,
	};

	static int __init gemtek_init(void)
	{
	if(io==-1)
	{
	printk(KERN_ERR "You must set an I/O address with io=0x20c, io=0x30c, io=0x24c or io=0x34c (io=0x020c or io=0x248 for the combined sound/radiocard)\n");
	return -EINVAL;
	}

	if (!request_region(io, 4, "gemtek"))
	{
	printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
	return -EBUSY;
	}

	gemtek_radio.priv=&gemtek_unit;

	if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
	{
	release_region(io, 4);
	return -EINVAL;
	}
	printk(KERN_INFO "GemTek Radio Card driver.\n");

	spin_lock_init(&lock);

	/* this is _maybe_ unnecessary */
	outb(0x01, io);

	/* mute card - prevents noisy bootups */
	gemtek_unit.muted = 0;
	gemtek_mute(&gemtek_unit);

	return 0;
	}

	MODULE_AUTHOR("Jonas Munsin");
	MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
	MODULE_LICENSE("GPL");

	module_param(io, int, 0);
	MODULE_PARM_DESC(io, "I/O address of the GemTek card (0x20c, 0x30c, 0x24c or 0x34c (0x20c or 0x248 have been reported to work for the combined sound/radiocard)).");
	module_param(radio_nr, int, 0);

	static void __exit gemtek_cleanup(void)
	{
	video_unregister_device(&gemtek_radio);
	release_region(io,4);
	}

	module_init(gemtek_init);
	module_exit(gemtek_cleanup);

	/*
	Local variables:
	compile-command: "gcc -c -DMODVERSIONS -D__KERNEL__ -DMODULE -O6 -Wall -Wstrict-prototypes -I /home/blp/tmp/linux-2.1.111-rtrack/include radio-rtrack2.c"
	End:
	*/