diff options
Diffstat (limited to 'drivers/media/dvb/frontends/mt2060.c')
| -rw-r--r-- | drivers/media/dvb/frontends/mt2060.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/mt2060.c b/drivers/media/dvb/frontends/mt2060.c new file mode 100644 index 0000000..508ec1b --- /dev/null +++ b/drivers/media/dvb/frontends/mt2060.c @@ -0,0 +1,367 @@ +/* + * 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/moduleparam.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 = ®, .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; + + 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,0x33); +} + +static int mt2060_sleep(struct dvb_frontend *fe) +{ + struct mt2060_priv *priv = fe->tuner_priv; + return mt2060_writereg(priv, REG_VGAG,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. */ +int 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 -ENOMEM; + + priv->cfg = cfg; + priv->i2c = i2c; + priv->if1_freq = if1; + + if (mt2060_readreg(priv,REG_PART_REV,&id) != 0) { + kfree(priv); + return -ENODEV; + } + + if (id != PART_REV) { + kfree(priv); + return -ENODEV; + } + 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 0; +} +EXPORT_SYMBOL(mt2060_attach); + +MODULE_AUTHOR("Olivier DANET"); +MODULE_DESCRIPTION("Microtune MT2060 silicon tuner driver"); +MODULE_LICENSE("GPL"); |
