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linux/drivers/media/common/tuners/mt2060.c
Mauro Carvalho Chehab b094516f95 V4L/DVB (7769): Move other terrestrial tuners to common/tuners 
Those tuners are currently used only under media/dvb. However,
they can support also analog TV. Better to move them to the same place
as the other hybrid tuners. This would make easier to use those tuners also
by analog drivers.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-29 18:41:38 -03:00

369 lines
9.4 KiB
C
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/*
* Driver for Microtune MT2060 "Single chip dual conversion broadband tuner"
*
* Copyright (c) 2006 Olivier DANET <odanet@caramail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.=
*/
/* In that file, frequencies are expressed in kiloHertz to avoid 32 bits overflows */
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dvb/frontend.h>
#include <linux/i2c.h>
#include "dvb_frontend.h"
#include "mt2060.h"
#include "mt2060_priv.h"
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2060: " args); printk("\n"); }} while (0)
// Reads a single register
static int mt2060_readreg(struct mt2060_priv *priv, u8 reg, u8 *val)
{
struct i2c_msg msg[2] = {
{ .addr = priv->cfg->i2c_address, .flags = 0, .buf = &reg, .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 "mt2060 I2C read failed\n");
return -EREMOTEIO;
}
return 0;
}
// Writes a single register
static int mt2060_writereg(struct mt2060_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 "mt2060 I2C write failed\n");
return -EREMOTEIO;
}
return 0;
}
// Writes a set of consecutive registers
static int mt2060_writeregs(struct mt2060_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 "mt2060 I2C write failed (len=%i)\n",(int)len);
return -EREMOTEIO;
}
return 0;
}
// Initialisation sequences
// LNABAND=3, NUM1=0x3C, DIV1=0x74, NUM2=0x1080, DIV2=0x49
static u8 mt2060_config1[] = {
REG_LO1C1,
0x3F, 0x74, 0x00, 0x08, 0x93
};
// FMCG=2, GP2=0, GP1=0
static u8 mt2060_config2[] = {
REG_MISC_CTRL,
0x20, 0x1E, 0x30, 0xff, 0x80, 0xff, 0x00, 0x2c, 0x42
};
// VGAG=3, V1CSE=1
#ifdef MT2060_SPURCHECK
/* The function below calculates the frequency offset between the output frequency if2
and the closer cross modulation subcarrier between lo1 and lo2 up to the tenth harmonic */
static int mt2060_spurcalc(u32 lo1,u32 lo2,u32 if2)
{
int I,J;
int dia,diamin,diff;
diamin=1000000;
for (I = 1; I < 10; I++) {
J = ((2*I*lo1)/lo2+1)/2;
diff = I*(int)lo1-J*(int)lo2;
if (diff < 0) diff=-diff;
dia = (diff-(int)if2);
if (dia < 0) dia=-dia;
if (diamin > dia) diamin=dia;
}
return diamin;
}
#define BANDWIDTH 4000 // kHz
/* Calculates the frequency offset to add to avoid spurs. Returns 0 if no offset is needed */
static int mt2060_spurcheck(u32 lo1,u32 lo2,u32 if2)
{
u32 Spur,Sp1,Sp2;
int I,J;
I=0;
J=1000;
Spur=mt2060_spurcalc(lo1,lo2,if2);
if (Spur < BANDWIDTH) {
/* Potential spurs detected */
dprintk("Spurs before : f_lo1: %d f_lo2: %d (kHz)",
(int)lo1,(int)lo2);
I=1000;
Sp1 = mt2060_spurcalc(lo1+I,lo2+I,if2);
Sp2 = mt2060_spurcalc(lo1-I,lo2-I,if2);
if (Sp1 < Sp2) {
J=-J; I=-I; Spur=Sp2;
} else
Spur=Sp1;
while (Spur < BANDWIDTH) {
I += J;
Spur = mt2060_spurcalc(lo1+I,lo2+I,if2);
}
dprintk("Spurs after : f_lo1: %d f_lo2: %d (kHz)",
(int)(lo1+I),(int)(lo2+I));
}
return I;
}
#endif
#define IF2 36150 // IF2 frequency = 36.150 MHz
#define FREF 16000 // Quartz oscillator 16 MHz
static int mt2060_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params)
{
struct mt2060_priv *priv;
int ret=0;
int i=0;
u32 freq;
u8 lnaband;
u32 f_lo1,f_lo2;
u32 div1,num1,div2,num2;
u8 b[8];
u32 if1;
priv = fe->tuner_priv;
if1 = priv->if1_freq;
b[0] = REG_LO1B1;
b[1] = 0xFF;
mt2060_writeregs(priv,b,2);
freq = params->frequency / 1000; // Hz -> kHz
priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0;
f_lo1 = freq + if1 * 1000;
f_lo1 = (f_lo1 / 250) * 250;
f_lo2 = f_lo1 - freq - IF2;
// From the Comtech datasheet, the step used is 50kHz. The tuner chip could be more precise
f_lo2 = ((f_lo2 + 25) / 50) * 50;
priv->frequency = (f_lo1 - f_lo2 - IF2) * 1000,
#ifdef MT2060_SPURCHECK
// LO-related spurs detection and correction
num1 = mt2060_spurcheck(f_lo1,f_lo2,IF2);
f_lo1 += num1;
f_lo2 += num1;
#endif
//Frequency LO1 = 16MHz * (DIV1 + NUM1/64 )
num1 = f_lo1 / (FREF / 64);
div1 = num1 / 64;
num1 &= 0x3f;
// Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 )
num2 = f_lo2 * 64 / (FREF / 128);
div2 = num2 / 8192;
num2 &= 0x1fff;
if (freq <= 95000) lnaband = 0xB0; else
if (freq <= 180000) lnaband = 0xA0; else
if (freq <= 260000) lnaband = 0x90; else
if (freq <= 335000) lnaband = 0x80; else
if (freq <= 425000) lnaband = 0x70; else
if (freq <= 480000) lnaband = 0x60; else
if (freq <= 570000) lnaband = 0x50; else
if (freq <= 645000) lnaband = 0x40; else
if (freq <= 730000) lnaband = 0x30; else
if (freq <= 810000) lnaband = 0x20; else lnaband = 0x10;
b[0] = REG_LO1C1;
b[1] = lnaband | ((num1 >>2) & 0x0F);
b[2] = div1;
b[3] = (num2 & 0x0F) | ((num1 & 3) << 4);
b[4] = num2 >> 4;
b[5] = ((num2 >>12) & 1) | (div2 << 1);
dprintk("IF1: %dMHz",(int)if1);
dprintk("PLL freq=%dkHz f_lo1=%dkHz f_lo2=%dkHz",(int)freq,(int)f_lo1,(int)f_lo2);
dprintk("PLL div1=%d num1=%d div2=%d num2=%d",(int)div1,(int)num1,(int)div2,(int)num2);
dprintk("PLL [1..5]: %2x %2x %2x %2x %2x",(int)b[1],(int)b[2],(int)b[3],(int)b[4],(int)b[5]);
mt2060_writeregs(priv,b,6);
//Waits for pll lock or timeout
i = 0;
do {
mt2060_readreg(priv,REG_LO_STATUS,b);
if ((b[0] & 0x88)==0x88)
break;
msleep(4);
i++;
} while (i<10);
return ret;
}
static void mt2060_calibrate(struct mt2060_priv *priv)
{
u8 b = 0;
int i = 0;
if (mt2060_writeregs(priv,mt2060_config1,sizeof(mt2060_config1)))
return;
if (mt2060_writeregs(priv,mt2060_config2,sizeof(mt2060_config2)))
return;
/* initialize the clock output */
mt2060_writereg(priv, REG_VGAG, (priv->cfg->clock_out << 6) | 0x30);
do {
b |= (1 << 6); // FM1SS;
mt2060_writereg(priv, REG_LO2C1,b);
msleep(20);
if (i == 0) {
b |= (1 << 7); // FM1CA;
mt2060_writereg(priv, REG_LO2C1,b);
b &= ~(1 << 7); // FM1CA;
msleep(20);
}
b &= ~(1 << 6); // FM1SS
mt2060_writereg(priv, REG_LO2C1,b);
msleep(20);
i++;
} while (i < 9);
i = 0;
while (i++ < 10 && mt2060_readreg(priv, REG_MISC_STAT, &b) == 0 && (b & (1 << 6)) == 0)
msleep(20);
if (i < 10) {
mt2060_readreg(priv, REG_FM_FREQ, &priv->fmfreq); // now find out, what is fmreq used for :)
dprintk("calibration was successful: %d", (int)priv->fmfreq);
} else
dprintk("FMCAL timed out");
}
static int mt2060_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct mt2060_priv *priv = fe->tuner_priv;
*frequency = priv->frequency;
return 0;
}
static int mt2060_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
{
struct mt2060_priv *priv = fe->tuner_priv;
*bandwidth = priv->bandwidth;
return 0;
}
static int mt2060_init(struct dvb_frontend *fe)
{
struct mt2060_priv *priv = fe->tuner_priv;
return mt2060_writereg(priv, REG_VGAG, (priv->cfg->clock_out << 6) | 0x33);
}
static int mt2060_sleep(struct dvb_frontend *fe)
{
struct mt2060_priv *priv = fe->tuner_priv;
return mt2060_writereg(priv, REG_VGAG, (priv->cfg->clock_out << 6) | 0x30);
}
static int mt2060_release(struct dvb_frontend *fe)
{
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
return 0;
}
static const struct dvb_tuner_ops mt2060_tuner_ops = {
.info = {
.name = "Microtune MT2060",
.frequency_min = 48000000,
.frequency_max = 860000000,
.frequency_step = 50000,
},
.release = mt2060_release,
.init = mt2060_init,
.sleep = mt2060_sleep,
.set_params = mt2060_set_params,
.get_frequency = mt2060_get_frequency,
.get_bandwidth = mt2060_get_bandwidth
};
/* This functions tries to identify a MT2060 tuner by reading the PART/REV register. This is hasty. */
struct dvb_frontend * mt2060_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2060_config *cfg, u16 if1)
{
struct mt2060_priv *priv = NULL;
u8 id = 0;
priv = kzalloc(sizeof(struct mt2060_priv), GFP_KERNEL);
if (priv == NULL)
return NULL;
priv->cfg = cfg;
priv->i2c = i2c;
priv->if1_freq = if1;
if (mt2060_readreg(priv,REG_PART_REV,&id) != 0) {
kfree(priv);
return NULL;
}
if (id != PART_REV) {
kfree(priv);
return NULL;
}
printk(KERN_INFO "MT2060: successfully identified (IF1 = %d)\n", if1);
memcpy(&fe->ops.tuner_ops, &mt2060_tuner_ops, sizeof(struct dvb_tuner_ops));
fe->tuner_priv = priv;
mt2060_calibrate(priv);
return fe;
}
EXPORT_SYMBOL(mt2060_attach);
MODULE_AUTHOR("Olivier DANET");
MODULE_DESCRIPTION("Microtune MT2060 silicon tuner driver");
MODULE_LICENSE("GPL");
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