// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for Microtune MT2131 "QAM/8VSB single chip tuner"
*
* Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dvb/frontend.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <media/dvb_frontend.h>
#include "mt2131.h"
#include "mt2131_priv.h"
static int debug;
module_param(debug, int , 0644 );
MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)." );
#define dprintk(level,fmt, arg...) if (debug >= level) \
printk(KERN_INFO "%s: " fmt, "mt2131" , ## arg)
static u8 mt2131_config1[] = {
0 x01,
0 x50, 0 x00, 0 x50, 0 x80, 0 x00, 0 x49, 0 xfa, 0 x88,
0 x08, 0 x77, 0 x41, 0 x04, 0 x00, 0 x00, 0 x00, 0 x32,
0 x7f, 0 xda, 0 x4c, 0 x00, 0 x10, 0 xaa, 0 x78, 0 x80,
0 xff, 0 x68, 0 xa0, 0 xff, 0 xdd, 0 x00, 0 x00
};
static u8 mt2131_config2[] = {
0 x10,
0 x7f, 0 xc8, 0 x0a, 0 x5f, 0 x00, 0 x04
};
static int mt2131_readreg(struct mt2131_priv *priv, u8 reg, u8 *val)
{
struct i2c_msg msg[2 ] = {
{ .addr = priv->cfg->i2c_address, .flags = 0 ,
.buf = ®, .len = 1 },
{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
.buf = val, .len = 1 },
};
if (i2c_transfer(priv->i2c, msg, 2 ) != 2 ) {
printk(KERN_WARNING "mt2131 I2C read failed\n" );
return -EREMOTEIO;
}
return 0 ;
}
static int mt2131_writereg(struct mt2131_priv *priv, u8 reg, u8 val)
{
u8 buf[2 ] = { reg, val };
struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0 ,
.buf = buf, .len = 2 };
if (i2c_transfer(priv->i2c, &msg, 1 ) != 1 ) {
printk(KERN_WARNING "mt2131 I2C write failed\n" );
return -EREMOTEIO;
}
return 0 ;
}
static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len)
{
struct i2c_msg msg = { .addr = priv->cfg->i2c_address,
.flags = 0 , .buf = buf, .len = len };
if (i2c_transfer(priv->i2c, &msg, 1 ) != 1 ) {
printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n" ,
(int )len);
return -EREMOTEIO;
}
return 0 ;
}
static int mt2131_set_params(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct mt2131_priv *priv;
int ret=0 , i;
u32 freq;
u8 if_band_center;
u32 f_lo1, f_lo2;
u32 div1, num1, div2, num2;
u8 b[8 ];
u8 lockval = 0 ;
priv = fe->tuner_priv;
freq = c->frequency / 1000 ; /* Hz -> kHz */
dprintk(1 , "%s() freq=%d\n" , __func__, freq);
f_lo1 = freq + MT2131_IF1 * 1000 ;
f_lo1 = (f_lo1 / 250 ) * 250 ;
f_lo2 = f_lo1 - freq - MT2131_IF2;
priv->frequency = (f_lo1 - f_lo2 - MT2131_IF2) * 1000 ;
/* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */
num1 = f_lo1 * 64 / (MT2131_FREF / 128 );
div1 = num1 / 8192 ;
num1 &= 0 x1fff;
/* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */
num2 = f_lo2 * 64 / (MT2131_FREF / 128 );
div2 = num2 / 8192 ;
num2 &= 0 x1fff;
if (freq <= 82500 ) if_band_center = 0 x00; else
if (freq <= 137500 ) if_band_center = 0 x01; else
if (freq <= 192500 ) if_band_center = 0 x02; else
if (freq <= 247500 ) if_band_center = 0 x03; else
if (freq <= 302500 ) if_band_center = 0 x04; else
if (freq <= 357500 ) if_band_center = 0 x05; else
if (freq <= 412500 ) if_band_center = 0 x06; else
if (freq <= 467500 ) if_band_center = 0 x07; else
if (freq <= 522500 ) if_band_center = 0 x08; else
if (freq <= 577500 ) if_band_center = 0 x09; else
if (freq <= 632500 ) if_band_center = 0 x0A; else
if (freq <= 687500 ) if_band_center = 0 x0B; else
if (freq <= 742500 ) if_band_center = 0 x0C; else
if (freq <= 797500 ) if_band_center = 0 x0D; else
if (freq <= 852500 ) if_band_center = 0 x0E; else
if (freq <= 907500 ) if_band_center = 0 x0F; else
if (freq <= 962500 ) if_band_center = 0 x10; else
if (freq <= 1017500 ) if_band_center = 0 x11; else
if (freq <= 1072500 ) if_band_center = 0 x12; else if_band_center = 0 x13;
b[0 ] = 1 ;
b[1 ] = (num1 >> 5 ) & 0 xFF;
b[2 ] = (num1 & 0 x1F);
b[3 ] = div1;
b[4 ] = (num2 >> 5 ) & 0 xFF;
b[5 ] = num2 & 0 x1F;
b[6 ] = div2;
dprintk(1 , "IF1: %dMHz IF2: %dMHz\n" , MT2131_IF1, MT2131_IF2);
dprintk(1 , "PLL freq=%dkHz band=%d\n" , (int )freq, (int )if_band_center);
dprintk(1 , "PLL f_lo1=%dkHz f_lo2=%dkHz\n" , (int )f_lo1, (int )f_lo2);
dprintk(1 , "PLL div1=%d num1=%d div2=%d num2=%d\n" ,
(int )div1, (int )num1, (int )div2, (int )num2);
dprintk(1 , "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n" ,
(int )b[1 ], (int )b[2 ], (int )b[3 ], (int )b[4 ], (int )b[5 ],
(int )b[6 ]);
ret = mt2131_writeregs(priv,b,7 );
if (ret < 0 )
return ret;
mt2131_writereg(priv, 0 x0b, if_band_center);
/* Wait for lock */
i = 0 ;
do {
mt2131_readreg(priv, 0 x08, &lockval);
if ((lockval & 0 x88) == 0 x88)
break ;
msleep(4 );
i++;
} while (i < 10 );
return ret;
}
static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct mt2131_priv *priv = fe->tuner_priv;
dprintk(1 , "%s()\n" , __func__);
*frequency = priv->frequency;
return 0 ;
}
static int mt2131_get_status(struct dvb_frontend *fe, u32 *status)
{
struct mt2131_priv *priv = fe->tuner_priv;
u8 lock_status = 0 ;
u8 afc_status = 0 ;
*status = 0 ;
mt2131_readreg(priv, 0 x08, &lock_status);
if ((lock_status & 0 x88) == 0 x88)
*status = TUNER_STATUS_LOCKED;
mt2131_readreg(priv, 0 x09, &afc_status);
dprintk(1 , "%s() - LO Status = 0x%x, AFC Status = 0x%x\n" ,
__func__, lock_status, afc_status);
return 0 ;
}
static int mt2131_init(struct dvb_frontend *fe)
{
struct mt2131_priv *priv = fe->tuner_priv;
int ret;
dprintk(1 , "%s()\n" , __func__);
if ((ret = mt2131_writeregs(priv, mt2131_config1,
sizeof (mt2131_config1))) < 0 )
return ret;
mt2131_writereg(priv, 0 x0b, 0 x09);
mt2131_writereg(priv, 0 x15, 0 x47);
mt2131_writereg(priv, 0 x07, 0 xf2);
mt2131_writereg(priv, 0 x0b, 0 x01);
if ((ret = mt2131_writeregs(priv, mt2131_config2,
sizeof (mt2131_config2))) < 0 )
return ret;
return ret;
}
static void mt2131_release(struct dvb_frontend *fe)
{
dprintk(1 , "%s()\n" , __func__);
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
}
static const struct dvb_tuner_ops mt2131_tuner_ops = {
.info = {
.name = "Microtune MT2131" ,
.frequency_min_hz = 48 * MHz,
.frequency_max_hz = 860 * MHz,
.frequency_step_hz = 50 * kHz,
},
.release = mt2131_release,
.init = mt2131_init,
.set_params = mt2131_set_params,
.get_frequency = mt2131_get_frequency,
.get_status = mt2131_get_status
};
struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c,
struct mt2131_config *cfg, u16 if1)
{
struct mt2131_priv *priv = NULL;
u8 id = 0 ;
dprintk(1 , "%s()\n" , __func__);
priv = kzalloc(sizeof (struct mt2131_priv), GFP_KERNEL);
if (priv == NULL)
return NULL;
priv->cfg = cfg;
priv->i2c = i2c;
if (mt2131_readreg(priv, 0 , &id) != 0 ) {
kfree(priv);
return NULL;
}
if ( (id != 0 x3E) && (id != 0 x3F) ) {
printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n" ,
cfg->i2c_address);
kfree(priv);
return NULL;
}
printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n" ,
cfg->i2c_address);
memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops,
sizeof (struct dvb_tuner_ops));
fe->tuner_priv = priv;
return fe;
}
EXPORT_SYMBOL_GPL(mt2131_attach);
MODULE_AUTHOR("Steven Toth" );
MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver" );
MODULE_LICENSE("GPL" );
Messung V0.5 in Prozent C=93 H=92 G=92
¤ Dauer der Verarbeitung: 0.9 Sekunden
(vorverarbeitet am 2026-06-07)
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