/* 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 <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#endifstatic 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,	.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_PARM(io, "i");MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");MODULE_PARM(radio_nr, "i");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);