[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / radio / radio-gemtek.c

/* 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:
*/
Commit	Line	Data
1da177e4 LT	1	/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
	2	*
	3	* GemTek hasn't released any specs on the card, so the protocol had to
	4	* be reverse engineered with dosemu.
	5	*
	6	* Besides the protocol changes, this is mostly a copy of:
	7	*
	8	* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
4286c6f6	9	*
1da177e4 LT	10	* Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
	11	* Converted to new API by Alan Cox <Alan.Cox@linux.org>
	12	* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
	13	*
	14	* TODO: Allow for more than one of these foolish entities :-)
	15	*
	16	*/
	17
	18	#include <linux/module.h> /* Modules */
	19	#include <linux/init.h> /* Initdata */
fb911ee8	20	#include <linux/ioport.h> /* request_region */
1da177e4 LT	21	#include <linux/delay.h> /* udelay */
	22	#include <asm/io.h> /* outb, outb_p */
	23	#include <asm/uaccess.h> /* copy to/from user */
	24	#include <linux/videodev.h> /* kernel radio structs */
5e87efa3	25	#include <media/v4l2-common.h>
1da177e4 LT	26	#include <linux/config.h> /* CONFIG_RADIO_GEMTEK_PORT */
	27	#include <linux/spinlock.h>
	28
	29	#ifndef CONFIG_RADIO_GEMTEK_PORT
	30	#define CONFIG_RADIO_GEMTEK_PORT -1
	31	#endif
	32
4286c6f6	33	static int io = CONFIG_RADIO_GEMTEK_PORT;
1da177e4 LT	34	static int radio_nr = -1;
	35	static spinlock_t lock;
	36
	37	struct gemtek_device
	38	{
	39	int port;
	40	unsigned long curfreq;
	41	int muted;
	42	};
	43
	44
	45	/* local things */
	46
	47	/* the correct way to mute the gemtek may be to write the last written
	48	* frequency \|\| 0x10, but just writing 0x10 once seems to do it as well
	49	*/
	50	static void gemtek_mute(struct gemtek_device *dev)
	51	{
4286c6f6	52	if(dev->muted)
1da177e4 LT	53	return;
	54	spin_lock(&lock);
	55	outb(0x10, io);
	56	spin_unlock(&lock);
	57	dev->muted = 1;
	58	}
	59
	60	static void gemtek_unmute(struct gemtek_device *dev)
	61	{
	62	if(dev->muted == 0)
	63	return;
	64	spin_lock(&lock);
	65	outb(0x20, io);
	66	spin_unlock(&lock);
	67	dev->muted = 0;
	68	}
	69
	70	static void zero(void)
	71	{
	72	outb_p(0x04, io);
	73	udelay(5);
	74	outb_p(0x05, io);
	75	udelay(5);
	76	}
	77
	78	static void one(void)
	79	{
	80	outb_p(0x06, io);
	81	udelay(5);
	82	outb_p(0x07, io);
	83	udelay(5);
	84	}
	85
	86	static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
	87	{
	88	int i;
	89
	90	/* freq = 78.25((float)freq/16000.0 + 10.52); /
	91
	92	freq /= 16;
	93	freq += 10520;
	94	freq *= 7825;
	95	freq /= 100000;
	96
	97	spin_lock(&lock);
4286c6f6	98
1da177e4 LT	99	/* 2 start bits */
	100	outb_p(0x03, io);
	101	udelay(5);
	102	outb_p(0x07, io);
	103	udelay(5);
	104
4286c6f6	105	/* 28 frequency bits (lsb first) */
1da177e4 LT	106	for (i = 0; i < 14; i++)
	107	if (freq & (1 << i))
	108	one();
	109	else
	110	zero();
4286c6f6	111	/* 36 unknown bits */
1da177e4 LT	112	for (i = 0; i < 11; i++)
	113	zero();
	114	one();
	115	for (i = 0; i < 4; i++)
	116	zero();
	117	one();
	118	zero();
	119
	120	/* 2 end bits */
	121	outb_p(0x03, io);
	122	udelay(5);
	123	outb_p(0x07, io);
	124	udelay(5);
	125
	126	spin_unlock(&lock);
4286c6f6	127
1da177e4 LT	128	return 0;
	129	}
	130
	131	static int gemtek_getsigstr(struct gemtek_device *dev)
	132	{
	133	spin_lock(&lock);
	134	inb(io);
	135	udelay(5);
	136	spin_unlock(&lock);
	137	if (inb(io) & 8) /* bit set = no signal present */
	138	return 0;
	139	return 1; /* signal present */
	140	}
	141
	142	static int gemtek_do_ioctl(struct inode inode, struct file file,
	143	unsigned int cmd, void *arg)
	144	{
	145	struct video_device *dev = video_devdata(file);
	146	struct gemtek_device *rt=dev->priv;
	147
	148	switch(cmd)
	149	{
	150	case VIDIOCGCAP:
	151	{
	152	struct video_capability *v = arg;
	153	memset(v,0,sizeof(*v));
	154	v->type=VID_TYPE_TUNER;
	155	v->channels=1;
	156	v->audios=1;
	157	strcpy(v->name, "GemTek");
	158	return 0;
	159	}
	160	case VIDIOCGTUNER:
	161	{
	162	struct video_tuner *v = arg;
4286c6f6	163	if(v->tuner) /* Only 1 tuner */
1da177e4 LT	164	return -EINVAL;
	165	v->rangelow=87*16000;
	166	v->rangehigh=108*16000;
	167	v->flags=VIDEO_TUNER_LOW;
	168	v->mode=VIDEO_MODE_AUTO;
	169	v->signal=0xFFFF*gemtek_getsigstr(rt);
	170	strcpy(v->name, "FM");
	171	return 0;
	172	}
	173	case VIDIOCSTUNER:
	174	{
	175	struct video_tuner *v = arg;
	176	if(v->tuner!=0)
	177	return -EINVAL;
	178	/* Only 1 tuner so no setting needed ! */
	179	return 0;
	180	}
	181	case VIDIOCGFREQ:
	182	{
	183	unsigned long *freq = arg;
	184	*freq = rt->curfreq;
	185	return 0;
	186	}
	187	case VIDIOCSFREQ:
	188	{
	189	unsigned long *freq = arg;
	190	rt->curfreq = *freq;
	191	/* needs to be called twice in order for getsigstr to work */
	192	gemtek_setfreq(rt, rt->curfreq);
	193	gemtek_setfreq(rt, rt->curfreq);
	194	return 0;
	195	}
	196	case VIDIOCGAUDIO:
4286c6f6	197	{
1da177e4 LT	198	struct video_audio *v = arg;
	199	memset(v,0, sizeof(*v));
	200	v->flags\|=VIDEO_AUDIO_MUTABLE;
	201	v->volume=1;
	202	v->step=65535;
	203	strcpy(v->name, "Radio");
4286c6f6	204	return 0;
1da177e4 LT	205	}
	206	case VIDIOCSAUDIO:
	207	{
	208	struct video_audio *v = arg;
4286c6f6	209	if(v->audio)
1da177e4 LT	210	return -EINVAL;
1da177e4 LT	211
4286c6f6	212	if(v->flags&VIDEO_AUDIO_MUTE)
1da177e4 LT	213	gemtek_mute(rt);
1da177e4 LT	214	else
4286c6f6	215	gemtek_unmute(rt);
1da177e4 LT	216
	217	return 0;
	218	}
	219	default:
	220	return -ENOIOCTLCMD;
	221	}
	222	}
	223
	224	static int gemtek_ioctl(struct inode inode, struct file file,
	225	unsigned int cmd, unsigned long arg)
	226	{
	227	return video_usercopy(inode, file, cmd, arg, gemtek_do_ioctl);
	228	}
	229
	230	static struct gemtek_device gemtek_unit;
	231
	232	static struct file_operations gemtek_fops = {
	233	.owner = THIS_MODULE,
	234	.open = video_exclusive_open,
	235	.release = video_exclusive_release,
	236	.ioctl = gemtek_ioctl,
0d0fbf81	237	.compat_ioctl = v4l_compat_ioctl32,
1da177e4 LT	238	.llseek = no_llseek,
	239	};
	240
	241	static struct video_device gemtek_radio=
	242	{
	243	.owner = THIS_MODULE,
	244	.name = "GemTek radio",
	245	.type = VID_TYPE_TUNER,
	246	.hardware = VID_HARDWARE_GEMTEK,
	247	.fops = &gemtek_fops,
	248	};
	249
	250	static int __init gemtek_init(void)
	251	{
	252	if(io==-1)
	253	{
	254	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");
	255	return -EINVAL;
	256	}
	257
4286c6f6	258	if (!request_region(io, 4, "gemtek"))
1da177e4 LT	259	{
	260	printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
	261	return -EBUSY;
	262	}
	263
	264	gemtek_radio.priv=&gemtek_unit;
4286c6f6	265
1da177e4 LT	266	if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
	267	{
	268	release_region(io, 4);
	269	return -EINVAL;
	270	}
	271	printk(KERN_INFO "GemTek Radio Card driver.\n");
	272
	273	spin_lock_init(&lock);
	274
	275	/* this is _maybe_ unnecessary */
	276	outb(0x01, io);
	277
4286c6f6	278	/* mute card - prevents noisy bootups */
1da177e4 LT	279	gemtek_unit.muted = 0;
	280	gemtek_mute(&gemtek_unit);
	281
	282	return 0;
	283	}
	284
	285	MODULE_AUTHOR("Jonas Munsin");
	286	MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
	287	MODULE_LICENSE("GPL");
	288
	289	module_param(io, int, 0);
	290	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)).");
	291	module_param(radio_nr, int, 0);
	292
	293	static void __exit gemtek_cleanup(void)
	294	{
	295	video_unregister_device(&gemtek_radio);
	296	release_region(io,4);
	297	}
	298
	299	module_init(gemtek_init);
	300	module_exit(gemtek_cleanup);
	301
	302	/*
	303	Local variables:
	304	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"
	305	End:
	306	*/