| /* |
| * 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.= |
| */ |
| |
| /* See mt2060_priv.h for details */ |
| |
| /* 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 "mt2060.h" |
| #include "mt2060_priv.h" |
| |
| static int debug=0; |
| 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_state *state, u8 reg, u8 *val) |
| { |
| struct i2c_msg msg[2] = { |
| { .addr = state->config->i2c_address, .flags = 0, .buf = ®, .len = 1 }, |
| { .addr = state->config->i2c_address, .flags = I2C_M_RD, .buf = val, .len = 1 }, |
| }; |
| |
| if (i2c_transfer(state->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_state *state, u8 reg, u8 val) |
| { |
| u8 buf[2]; |
| struct i2c_msg msg = { |
| .addr = state->config->i2c_address, .flags = 0, .buf = buf, .len = 2 |
| }; |
| buf[0]=reg; |
| buf[1]=val; |
| |
| if (i2c_transfer(state->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_state *state,u8 *buf, u8 len) |
| { |
| struct i2c_msg msg = { |
| .addr = state->config->i2c_address, .flags = 0, .buf = buf, .len = len |
| }; |
| if (i2c_transfer(state->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 |
| static u8 mt2060_config3[] = { |
| REG_VGAG, |
| 0x33 |
| }; |
| |
| int mt2060_init(struct mt2060_state *state) |
| { |
| if (mt2060_writeregs(state,mt2060_config1,sizeof(mt2060_config1))) |
| return -EREMOTEIO; |
| if (mt2060_writeregs(state,mt2060_config3,sizeof(mt2060_config3))) |
| return -EREMOTEIO; |
| return 0; |
| } |
| EXPORT_SYMBOL(mt2060_init); |
| |
| #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 |
| |
| int mt2060_set(struct mt2060_state *state, struct dvb_frontend_parameters *fep) |
| { |
| 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; |
| |
| if1 = state->if1_freq; |
| b[0] = REG_LO1B1; |
| b[1] = 0xFF; |
| mt2060_writeregs(state,b,2); |
| |
| freq = fep->frequency / 1000; // Hz -> kHz |
| |
| f_lo1 = freq + if1 * 1000; |
| f_lo1 = (f_lo1/250)*250; |
| f_lo2 = f_lo1 - freq - IF2; |
| f_lo2 = (f_lo2/50)*50; |
| |
| #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 ) |
| div1 = f_lo1 / FREF; |
| num1 = (64 * (f_lo1 % FREF) )/FREF; |
| |
| // Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) |
| div2 = f_lo2 / FREF; |
| num2 = (16384 * (f_lo2 % FREF) /FREF +1)/2; |
| |
| 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: %d f_lo1: %d f_lo2: %d (kHz)",(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(state,b,6); |
| |
| //Waits for pll lock or timeout |
| i=0; |
| do { |
| mt2060_readreg(state,REG_LO_STATUS,b); |
| if ((b[0] & 0x88)==0x88) break; |
| msleep(4); |
| i++; |
| } while (i<10); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(mt2060_set); |
| |
| /* from usbsnoop.log */ |
| static void mt2060_calibrate(struct mt2060_state *state) |
| { |
| u8 b = 0; |
| int i = 0; |
| |
| if (mt2060_writeregs(state,mt2060_config1,sizeof(mt2060_config1))) |
| return; |
| if (mt2060_writeregs(state,mt2060_config2,sizeof(mt2060_config2))) |
| return; |
| |
| do { |
| b |= (1 << 6); // FM1SS; |
| mt2060_writereg(state, REG_LO2C1,b); |
| msleep(20); |
| |
| if (i == 0) { |
| b |= (1 << 7); // FM1CA; |
| mt2060_writereg(state, REG_LO2C1,b); |
| b &= ~(1 << 7); // FM1CA; |
| msleep(20); |
| } |
| |
| b &= ~(1 << 6); // FM1SS |
| mt2060_writereg(state, REG_LO2C1,b); |
| |
| msleep(20); |
| i++; |
| } while (i < 9); |
| |
| i = 0; |
| while (i++ < 10 && mt2060_readreg(state, REG_MISC_STAT, &b) == 0 && (b & (1 << 6)) == 0) |
| msleep(20); |
| |
| if (i < 10) { |
| mt2060_readreg(state, REG_FM_FREQ, &state->fmfreq); // now find out, what is fmreq used for :) |
| dprintk("calibration was successful: %d",state->fmfreq); |
| } else |
| dprintk("FMCAL timed out"); |
| } |
| |
| /* This functions tries to identify a MT2060 tuner by reading the PART/REV register. This is hasty. */ |
| int mt2060_attach(struct mt2060_state *state, struct mt2060_config *config, struct i2c_adapter *i2c,u16 if1) |
| { |
| u8 id = 0; |
| memset(state,0,sizeof(struct mt2060_state)); |
| |
| state->config = config; |
| state->i2c = i2c; |
| state->if1_freq = if1; |
| |
| if (mt2060_readreg(state,REG_PART_REV,&id) != 0) |
| return -ENODEV; |
| |
| if (id != PART_REV) |
| return -ENODEV; |
| |
| printk(KERN_INFO "MT2060: successfully identified\n"); |
| |
| mt2060_calibrate(state); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mt2060_attach); |
| |
| MODULE_AUTHOR("Olivier DANET"); |
| MODULE_DESCRIPTION("Microtune MT2060 silicon tuner driver"); |
| MODULE_LICENSE("GPL"); |