mt20xx.c

linux 内核源代码

	// per Manual for FM tuning: first if center freq. 1085 MHz
	mt2032_set_if_freq(fe, params->frequency * 125 / 2,
			   1085*1000*1000,if2,if2,if2);

	return 0;
}

static int mt2032_set_params(struct dvb_frontend *fe,
			     struct analog_parameters *params)
{
	struct microtune_priv *priv = fe->tuner_priv;
	int ret = -EINVAL;

	switch (params->mode) {
	case V4L2_TUNER_RADIO:
		ret = mt2032_set_radio_freq(fe, params);
		priv->frequency = params->frequency * 125 / 2;
		break;
	case V4L2_TUNER_ANALOG_TV:
	case V4L2_TUNER_DIGITAL_TV:
		ret = mt2032_set_tv_freq(fe, params);
		priv->frequency = params->frequency * 62500;
		break;
	}

	return ret;
}

static struct dvb_tuner_ops mt2032_tuner_ops = {
	.set_analog_params = mt2032_set_params,
	.release           = microtune_release,
	.get_frequency     = microtune_get_frequency,
};

// Initalization as described in "MT203x Programming Procedures", Rev 1.2, Feb.2001
static int mt2032_init(struct dvb_frontend *fe)
{
	struct microtune_priv *priv = fe->tuner_priv;
	unsigned char buf[21];
	int ret,xogc,xok=0;

	// Initialize Registers per spec.
	buf[1]=2; // Index to register 2
	buf[2]=0xff;
	buf[3]=0x0f;
	buf[4]=0x1f;
	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+1,4);

	buf[5]=6; // Index register 6
	buf[6]=0xe4;
	buf[7]=0x8f;
	buf[8]=0xc3;
	buf[9]=0x4e;
	buf[10]=0xec;
	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+5,6);

	buf[12]=13;  // Index register 13
	buf[13]=0x32;
	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf+12,2);

	// Adjust XOGC (register 7), wait for XOK
	xogc=7;
	do {
		tuner_dbg("mt2032: xogc = 0x%02x\n",xogc&0x07);
		mdelay(10);
		buf[0]=0x0e;
		tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
		tuner_i2c_xfer_recv(&priv->i2c_props,buf,1);
		xok=buf[0]&0x01;
		tuner_dbg("mt2032: xok = 0x%02x\n",xok);
		if (xok == 1) break;

		xogc--;
		tuner_dbg("mt2032: xogc = 0x%02x\n",xogc&0x07);
		if (xogc == 3) {
			xogc=4; // min. 4 per spec
			break;
		}
		buf[0]=0x07;
		buf[1]=0x88 + xogc;
		ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
		if (ret!=2)
			tuner_warn("i2c i/o error: rc == %d (should be 2)\n",ret);
	} while (xok != 1 );
	priv->xogc=xogc;

	memcpy(&fe->ops.tuner_ops, &mt2032_tuner_ops, sizeof(struct dvb_tuner_ops));

	return(1);
}

static void mt2050_set_antenna(struct dvb_frontend *fe, unsigned char antenna)
{
	struct microtune_priv *priv = fe->tuner_priv;
	unsigned char buf[2];
	int ret;

	buf[0] = 6;
	buf[1] = antenna ? 0x11 : 0x10;
	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2);
	tuner_dbg("mt2050: enabled antenna connector %d\n", antenna);
}

static void mt2050_set_if_freq(struct dvb_frontend *fe,unsigned int freq, unsigned int if2)
{
	struct microtune_priv *priv = fe->tuner_priv;
	unsigned int if1=1218*1000*1000;
	unsigned int f_lo1,f_lo2,lo1,lo2,f_lo1_modulo,f_lo2_modulo,num1,num2,div1a,div1b,div2a,div2b;
	int ret;
	unsigned char buf[6];

	tuner_dbg("mt2050_set_if_freq freq=%d if1=%d if2=%d\n",
		  freq,if1,if2);

	f_lo1=freq+if1;
	f_lo1=(f_lo1/1000000)*1000000;

	f_lo2=f_lo1-freq-if2;
	f_lo2=(f_lo2/50000)*50000;

	lo1=f_lo1/4000000;
	lo2=f_lo2/4000000;

	f_lo1_modulo= f_lo1-(lo1*4000000);
	f_lo2_modulo= f_lo2-(lo2*4000000);

	num1=4*f_lo1_modulo/4000000;
	num2=4096*(f_lo2_modulo/1000)/4000;

	// todo spurchecks

	div1a=(lo1/12)-1;
	div1b=lo1-(div1a+1)*12;

	div2a=(lo2/8)-1;
	div2b=lo2-(div2a+1)*8;

	if (debug > 1) {
		tuner_dbg("lo1 lo2 = %d %d\n", lo1, lo2);
		tuner_dbg("num1 num2 div1a div1b div2a div2b= %x %x %x %x %x %x\n",
			  num1,num2,div1a,div1b,div2a,div2b);
	}

	buf[0]=1;
	buf[1]= 4*div1b + num1;
	if(freq<275*1000*1000) buf[1] = buf[1]|0x80;

	buf[2]=div1a;
	buf[3]=32*div2b + num2/256;
	buf[4]=num2-(num2/256)*256;
	buf[5]=div2a;
	if(num2!=0) buf[5]=buf[5]|0x40;

	if (debug > 1) {
		int i;
		tuner_dbg("bufs is: ");
		for(i=0;i<6;i++)
			printk("%x ",buf[i]);
		printk("\n");
	}

	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,6);
	if (ret!=6)
		tuner_warn("i2c i/o error: rc == %d (should be 6)\n",ret);
}

static int mt2050_set_tv_freq(struct dvb_frontend *fe,
			      struct analog_parameters *params)
{
	unsigned int if2;

	if (params->std & V4L2_STD_525_60) {
		// NTSC
		if2 = 45750*1000;
	} else {
		// PAL
		if2 = 38900*1000;
	}
	if (V4L2_TUNER_DIGITAL_TV == params->mode) {
		// DVB (pinnacle 300i)
		if2 = 36150*1000;
	}
	mt2050_set_if_freq(fe, params->frequency*62500, if2);
	mt2050_set_antenna(fe, tv_antenna);

	return 0;
}

static int mt2050_set_radio_freq(struct dvb_frontend *fe,
				 struct analog_parameters *params)
{
	struct microtune_priv *priv = fe->tuner_priv;
	int if2;

	if (params->std & V4L2_STD_525_60) {
		tuner_dbg("pinnacle ntsc\n");
		if2 = 41300 * 1000;
	} else {
		tuner_dbg("pinnacle pal\n");
		if2 = 33300 * 1000;
	}

	mt2050_set_if_freq(fe, params->frequency * 125 / 2, if2);
	mt2050_set_antenna(fe, radio_antenna);

	return 0;
}

static int mt2050_set_params(struct dvb_frontend *fe,
			     struct analog_parameters *params)
{
	struct microtune_priv *priv = fe->tuner_priv;
	int ret = -EINVAL;

	switch (params->mode) {
	case V4L2_TUNER_RADIO:
		ret = mt2050_set_radio_freq(fe, params);
		priv->frequency = params->frequency * 125 / 2;
		break;
	case V4L2_TUNER_ANALOG_TV:
	case V4L2_TUNER_DIGITAL_TV:
		ret = mt2050_set_tv_freq(fe, params);
		priv->frequency = params->frequency * 62500;
		break;
	}

	return ret;
}

static struct dvb_tuner_ops mt2050_tuner_ops = {
	.set_analog_params = mt2050_set_params,
	.release           = microtune_release,
	.get_frequency     = microtune_get_frequency,
};

static int mt2050_init(struct dvb_frontend *fe)
{
	struct microtune_priv *priv = fe->tuner_priv;
	unsigned char buf[2];
	int ret;

	buf[0]=6;
	buf[1]=0x10;
	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2); //  power

	buf[0]=0x0f;
	buf[1]=0x0f;
	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,2); // m1lo

	buf[0]=0x0d;
	ret=tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
	tuner_i2c_xfer_recv(&priv->i2c_props,buf,1);

	tuner_dbg("mt2050: sro is %x\n",buf[0]);

	memcpy(&fe->ops.tuner_ops, &mt2050_tuner_ops, sizeof(struct dvb_tuner_ops));

	return 0;
}

struct dvb_frontend *microtune_attach(struct dvb_frontend *fe,
				      struct i2c_adapter* i2c_adap,
				      u8 i2c_addr)
{
	struct microtune_priv *priv = NULL;
	char *name;
	unsigned char buf[21];
	int company_code;

	priv = kzalloc(sizeof(struct microtune_priv), GFP_KERNEL);
	if (priv == NULL)
		return NULL;
	fe->tuner_priv = priv;

	priv->i2c_props.addr = i2c_addr;
	priv->i2c_props.adap = i2c_adap;

	//priv->radio_if2 = 10700 * 1000;	/* 10.7MHz - FM radio */

	memset(buf,0,sizeof(buf));

	name = "unknown";

	tuner_i2c_xfer_send(&priv->i2c_props,buf,1);
	tuner_i2c_xfer_recv(&priv->i2c_props,buf,21);
	if (debug) {
		int i;
		tuner_dbg("MT20xx hexdump:");
		for(i=0;i<21;i++) {
			printk(" %02x",buf[i]);
			if(((i+1)%8)==0) printk(" ");
		}
		printk("\n");
	}
	company_code = buf[0x11] << 8 | buf[0x12];
	tuner_info("microtune: companycode=%04x part=%02x rev=%02x\n",
		   company_code,buf[0x13],buf[0x14]);


	if (buf[0x13] < ARRAY_SIZE(microtune_part) &&
	    NULL != microtune_part[buf[0x13]])
		name = microtune_part[buf[0x13]];
	switch (buf[0x13]) {
	case MT2032:
		mt2032_init(fe);
		break;
	case MT2050:
		mt2050_init(fe);
		break;
	default:
		tuner_info("microtune %s found, not (yet?) supported, sorry :-/\n",
			   name);
		return 0;
	}

	strlcpy(fe->ops.tuner_ops.info.name, name,
		sizeof(fe->ops.tuner_ops.info.name));
	tuner_info("microtune %s found, OK\n",name);
	return fe;
}

EXPORT_SYMBOL_GPL(microtune_attach);

MODULE_DESCRIPTION("Microtune tuner driver");
MODULE_AUTHOR("Ralph Metzler, Gerd Knorr, Gunther Mayer");
MODULE_LICENSE("GPL");

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */