drivers/media/radio/radio-trust.c - linux - Git at Google

 /* radio-trust.c - Trust FM Radio card driver for Linux 2.2
  * by Eric Lammerts <eric@scintilla.utwente.nl>
  *
  * Based on radio-aztech.c. Original notes:
  *
  * Adapted to support the Video for Linux API by
  * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
  *
  * Quay Ly
  * Donald Song
  * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
  * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
  * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
  *
  * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
  */

 #include <stdarg.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <linux/videodev.h>
 #include <media/v4l2-common.h>
 #include <linux/config.h>	/* CONFIG_RADIO_TRUST_PORT 	*/

 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */

 #ifndef CONFIG_RADIO_TRUST_PORT
 #define CONFIG_RADIO_TRUST_PORT -1
 #endif

 static int io = CONFIG_RADIO_TRUST_PORT;
 static int radio_nr = -1;
 static int ioval = 0xf;
 static __u16 curvol;
 static __u16 curbass;
 static __u16 curtreble;
 static unsigned long curfreq;
 static int curstereo;
 static int curmute;

 /* i2c addresses */
 #define TDA7318_ADDR 0x88
 #define TSA6060T_ADDR 0xc4

 #define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
 #define TR_SET_SCL outb(ioval |= 2, io)
 #define TR_CLR_SCL outb(ioval &= 0xfd, io)
 #define TR_SET_SDA outb(ioval |= 1, io)
 #define TR_CLR_SDA outb(ioval &= 0xfe, io)

 static void write_i2c(int n, ...)
 {
 	unsigned char val, mask;
 	va_list args;

 	va_start(args, n);

 	/* start condition */
 	TR_SET_SDA;
 	TR_SET_SCL;
 	TR_DELAY;
 	TR_CLR_SDA;
 	TR_CLR_SCL;
 	TR_DELAY;

 	for(; n; n--) {
 		val = va_arg(args, unsigned);
 		for(mask = 0x80; mask; mask >>= 1) {
 			if(val & mask)
 				TR_SET_SDA;
 			else
 				TR_CLR_SDA;
 			TR_SET_SCL;
 			TR_DELAY;
 			TR_CLR_SCL;
 			TR_DELAY;
 		}
 		/* acknowledge bit */
 		TR_SET_SDA;
 		TR_SET_SCL;
 		TR_DELAY;
 		TR_CLR_SCL;
 		TR_DELAY;
 	}

 	/* stop condition */
 	TR_CLR_SDA;
 	TR_DELAY;
 	TR_SET_SCL;
 	TR_DELAY;
 	TR_SET_SDA;
 	TR_DELAY;

 	va_end(args);
 }

 static void tr_setvol(__u16 vol)
 {
 	curvol = vol / 2048;
 	write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
 }

 static int basstreble2chip[15] = {
 	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
 };

 static void tr_setbass(__u16 bass)
 {
 	curbass = bass / 4370;
 	write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
 }

 static void tr_settreble(__u16 treble)
 {
 	curtreble = treble / 4370;
 	write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
 }

 static void tr_setstereo(int stereo)
 {
 	curstereo = !!stereo;
 	ioval = (ioval & 0xfb) | (!curstereo << 2);
 	outb(ioval, io);
 }

 static void tr_setmute(int mute)
 {
 	curmute = !!mute;
 	ioval = (ioval & 0xf7) | (curmute << 3);
 	outb(ioval, io);
 }

 static int tr_getsigstr(void)
 {
 	int i, v;

 	for(i = 0, v = 0; i < 100; i++) v |= inb(io);
 	return (v & 1)? 0 : 0xffff;
 }

 static int tr_getstereo(void)
 {
 	/* don't know how to determine it, just return the setting */
 	return curstereo;
 }

 static void tr_setfreq(unsigned long f)
 {
 	f /= 160;	/* Convert to 10 kHz units	*/
 	f += 1070;	/* Add 10.7 MHz IF			*/

 	write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
 }

 static int tr_do_ioctl(struct inode *inode, struct file *file,
 		       unsigned int cmd, void *arg)
 {
 	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, "Trust FM Radio");

 			return 0;
 		}
 		case VIDIOCGTUNER:
 		{
 			struct video_tuner *v = arg;

 			if(v->tuner)	/* Only 1 tuner */
 				return -EINVAL;

 			v->rangelow = 87500 * 16;
 			v->rangehigh = 108000 * 16;
 			v->flags = VIDEO_TUNER_LOW;
 			v->mode = VIDEO_MODE_AUTO;

 			v->signal = tr_getsigstr();
 			if(tr_getstereo())
 				v->flags |= VIDEO_TUNER_STEREO_ON;

 			strcpy(v->name, "FM");

 			return 0;
 		}
 		case VIDIOCSTUNER:
 		{
 			struct video_tuner *v = arg;
 			if(v->tuner != 0)
 				return -EINVAL;
 			return 0;
 		}
 		case VIDIOCGFREQ:
 		{
 			unsigned long *freq = arg;
 			*freq = curfreq;
 			return 0;
 		}
 		case VIDIOCSFREQ:
 		{
 			unsigned long *freq = arg;
 			tr_setfreq(*freq);
 			return 0;
 		}
 		case VIDIOCGAUDIO:
 		{
 			struct video_audio *v = arg;

 			memset(v,0, sizeof(*v));
 			v->flags = VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME |
 				  VIDEO_AUDIO_BASS | VIDEO_AUDIO_TREBLE;
 			v->mode = curstereo? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
 			v->volume = curvol * 2048;
 			v->step = 2048;
 			v->bass = curbass * 4370;
 			v->treble = curtreble * 4370;

 			strcpy(v->name, "Trust FM Radio");
 			return 0;
 		}
 		case VIDIOCSAUDIO:
 		{
 			struct video_audio *v = arg;

 			if(v->audio)
 				return -EINVAL;
 			tr_setvol(v->volume);
 			tr_setbass(v->bass);
 			tr_settreble(v->treble);
 			tr_setstereo(v->mode & VIDEO_SOUND_STEREO);
 			tr_setmute(v->flags & VIDEO_AUDIO_MUTE);
 			return 0;
 		}
 		default:
 			return -ENOIOCTLCMD;
 	}
 }

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

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

 static struct video_device trust_radio=
 {
 	.owner		= THIS_MODULE,
 	.name		= "Trust FM Radio",
 	.type		= VID_TYPE_TUNER,
 	.hardware	= VID_HARDWARE_TRUST,
 	.fops           = &trust_fops,
 };

 static int __init trust_init(void)
 {
 	if(io == -1) {
 		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 		return -EINVAL;
 	}
 	if(!request_region(io, 2, "Trust FM Radio")) {
 		printk(KERN_ERR "trust: port 0x%x already in use\n", io);
 		return -EBUSY;
 	}
 	if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 	{
 		release_region(io, 2);
 		return -EINVAL;
 	}

 	printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");

 	write_i2c(2, TDA7318_ADDR, 0x80);	/* speaker att. LF = 0 dB */
 	write_i2c(2, TDA7318_ADDR, 0xa0);	/* speaker att. RF = 0 dB */
 	write_i2c(2, TDA7318_ADDR, 0xc0);	/* speaker att. LR = 0 dB */
 	write_i2c(2, TDA7318_ADDR, 0xe0);	/* speaker att. RR = 0 dB */
 	write_i2c(2, TDA7318_ADDR, 0x40);	/* stereo 1 input, gain = 18.75 dB */

 	tr_setvol(0x8000);
 	tr_setbass(0x8000);
 	tr_settreble(0x8000);
 	tr_setstereo(1);

 	/* mute card - prevents noisy bootups */
 	tr_setmute(1);

 	return 0;
 }

 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
 MODULE_LICENSE("GPL");

 module_param(io, int, 0);
 MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
 module_param(radio_nr, int, 0);

 static void __exit cleanup_trust_module(void)
 {
 	video_unregister_device(&trust_radio);
 	release_region(io, 2);
 }

 module_init(trust_init);
 module_exit(cleanup_trust_module);
	/* radio-trust.c - Trust FM Radio card driver for Linux 2.2
	* by Eric Lammerts <eric@scintilla.utwente.nl>
	*
	* Based on radio-aztech.c. Original notes:
	*
	* Adapted to support the Video for Linux API by
	* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
	*
	* Quay Ly
	* Donald Song
	* Jason Lewis (jlewis@twilight.vtc.vsc.edu)
	* Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
	* William McGrath (wmcgrath@twilight.vtc.vsc.edu)
	*
	* The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
	*/

	#include <stdarg.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <asm/io.h>
	#include <asm/uaccess.h>
	#include <linux/videodev.h>
	#include <media/v4l2-common.h>
	#include <linux/config.h> /* CONFIG_RADIO_TRUST_PORT */

	/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */

	#ifndef CONFIG_RADIO_TRUST_PORT
	#define CONFIG_RADIO_TRUST_PORT -1
	#endif

	static int io = CONFIG_RADIO_TRUST_PORT;
	static int radio_nr = -1;
	static int ioval = 0xf;
	static __u16 curvol;
	static __u16 curbass;
	static __u16 curtreble;
	static unsigned long curfreq;
	static int curstereo;
	static int curmute;

	/* i2c addresses */
	#define TDA7318_ADDR 0x88
	#define TSA6060T_ADDR 0xc4

	#define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
	#define TR_SET_SCL outb(ioval \|= 2, io)
	#define TR_CLR_SCL outb(ioval &= 0xfd, io)
	#define TR_SET_SDA outb(ioval \|= 1, io)
	#define TR_CLR_SDA outb(ioval &= 0xfe, io)

	static void write_i2c(int n, ...)
	{
	unsigned char val, mask;
	va_list args;

	va_start(args, n);

	/* start condition */
	TR_SET_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SDA;
	TR_CLR_SCL;
	TR_DELAY;

	for(; n; n--) {
	val = va_arg(args, unsigned);
	for(mask = 0x80; mask; mask >>= 1) {
	if(val & mask)
	TR_SET_SDA;
	else
	TR_CLR_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SCL;
	TR_DELAY;
	}
	/* acknowledge bit */
	TR_SET_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SCL;
	TR_DELAY;
	}

	/* stop condition */
	TR_CLR_SDA;
	TR_DELAY;
	TR_SET_SCL;
	TR_DELAY;
	TR_SET_SDA;
	TR_DELAY;

	va_end(args);
	}

	static void tr_setvol(__u16 vol)
	{
	curvol = vol / 2048;
	write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
	}

	static int basstreble2chip[15] = {
	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
	};

	static void tr_setbass(__u16 bass)
	{
	curbass = bass / 4370;
	write_i2c(2, TDA7318_ADDR, 0x60 \| basstreble2chip[curbass]);
	}

	static void tr_settreble(__u16 treble)
	{
	curtreble = treble / 4370;
	write_i2c(2, TDA7318_ADDR, 0x70 \| basstreble2chip[curtreble]);
	}

	static void tr_setstereo(int stereo)
	{
	curstereo = !!stereo;
	ioval = (ioval & 0xfb) \| (!curstereo << 2);
	outb(ioval, io);
	}

	static void tr_setmute(int mute)
	{
	curmute = !!mute;
	ioval = (ioval & 0xf7) \| (curmute << 3);
	outb(ioval, io);
	}

	static int tr_getsigstr(void)
	{
	int i, v;

	for(i = 0, v = 0; i < 100; i++) v \|= inb(io);
	return (v & 1)? 0 : 0xffff;
	}

	static int tr_getstereo(void)
	{
	/* don't know how to determine it, just return the setting */
	return curstereo;
	}

	static void tr_setfreq(unsigned long f)
	{
	f /= 160; /* Convert to 10 kHz units */
	f += 1070; /* Add 10.7 MHz IF */

	write_i2c(5, TSA6060T_ADDR, (f << 1) \| 1, f >> 7, 0x60 \| ((f >> 15) & 1), 0);
	}

	static int tr_do_ioctl(struct inode inode, struct file file,
	unsigned int cmd, void *arg)
	{
	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, "Trust FM Radio");

	return 0;
	}
	case VIDIOCGTUNER:
	{
	struct video_tuner *v = arg;

	if(v->tuner) /* Only 1 tuner */
	return -EINVAL;

	v->rangelow = 87500 * 16;
	v->rangehigh = 108000 * 16;
	v->flags = VIDEO_TUNER_LOW;
	v->mode = VIDEO_MODE_AUTO;

	v->signal = tr_getsigstr();
	if(tr_getstereo())
	v->flags \|= VIDEO_TUNER_STEREO_ON;

	strcpy(v->name, "FM");

	return 0;
	}
	case VIDIOCSTUNER:
	{
	struct video_tuner *v = arg;
	if(v->tuner != 0)
	return -EINVAL;
	return 0;
	}
	case VIDIOCGFREQ:
	{
	unsigned long *freq = arg;
	*freq = curfreq;
	return 0;
	}
	case VIDIOCSFREQ:
	{
	unsigned long *freq = arg;
	tr_setfreq(*freq);
	return 0;
	}
	case VIDIOCGAUDIO:
	{
	struct video_audio *v = arg;

	memset(v,0, sizeof(*v));
	v->flags = VIDEO_AUDIO_MUTABLE \| VIDEO_AUDIO_VOLUME \|
	VIDEO_AUDIO_BASS \| VIDEO_AUDIO_TREBLE;
	v->mode = curstereo? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
	v->volume = curvol * 2048;
	v->step = 2048;
	v->bass = curbass * 4370;
	v->treble = curtreble * 4370;

	strcpy(v->name, "Trust FM Radio");
	return 0;
	}
	case VIDIOCSAUDIO:
	{
	struct video_audio *v = arg;

	if(v->audio)
	return -EINVAL;
	tr_setvol(v->volume);
	tr_setbass(v->bass);
	tr_settreble(v->treble);
	tr_setstereo(v->mode & VIDEO_SOUND_STEREO);
	tr_setmute(v->flags & VIDEO_AUDIO_MUTE);
	return 0;
	}
	default:
	return -ENOIOCTLCMD;
	}
	}

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

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

	static struct video_device trust_radio=
	{
	.owner = THIS_MODULE,
	.name = "Trust FM Radio",
	.type = VID_TYPE_TUNER,
	.hardware = VID_HARDWARE_TRUST,
	.fops = &trust_fops,
	};

	static int __init trust_init(void)
	{
	if(io == -1) {
	printk(KERN_ERR "You must set an I/O address with io=0x???\n");
	return -EINVAL;
	}
	if(!request_region(io, 2, "Trust FM Radio")) {
	printk(KERN_ERR "trust: port 0x%x already in use\n", io);
	return -EBUSY;
	}
	if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
	{
	release_region(io, 2);
	return -EINVAL;
	}

	printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");

	write_i2c(2, TDA7318_ADDR, 0x80); /* speaker att. LF = 0 dB */
	write_i2c(2, TDA7318_ADDR, 0xa0); /* speaker att. RF = 0 dB */
	write_i2c(2, TDA7318_ADDR, 0xc0); /* speaker att. LR = 0 dB */
	write_i2c(2, TDA7318_ADDR, 0xe0); /* speaker att. RR = 0 dB */
	write_i2c(2, TDA7318_ADDR, 0x40); /* stereo 1 input, gain = 18.75 dB */

	tr_setvol(0x8000);
	tr_setbass(0x8000);
	tr_settreble(0x8000);
	tr_setstereo(1);

	/* mute card - prevents noisy bootups */
	tr_setmute(1);

	return 0;
	}

	MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
	MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
	MODULE_LICENSE("GPL");

	module_param(io, int, 0);
	MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
	module_param(radio_nr, int, 0);

	static void __exit cleanup_trust_module(void)
	{
	video_unregister_device(&trust_radio);
	release_region(io, 2);
	}

	module_init(trust_init);
	module_exit(cleanup_trust_module);