Adding support for MT2060 and thus for some DVB-USB-devices based on it

From: Olivier DANET <odanet@caramail.com>


- MT2060 tuner driver
- Added support for some USB DVB-T devices based on Dib3000P

Signed-off-by: Olivier DANET <odanet@caramail.com>
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>

1 files changed, 257 insertions, 0 deletions

diff --git a/linux/drivers/media/dvb/frontends/mt2060.c b/linux/drivers/media/dvb/frontends/mt2060.c
new file mode 100644
index 000000000..4d8efe1ae
--- /dev/null
+++ b/linux/drivers/media/dvb/frontends/mt2060.c
@@ -0,0 +1,257 @@
+/*
+ *  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/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 = &reg, .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;
+}
+
+// Initialization : VGAG=01, V1CSE=1
+static u8 mt2060_config1[] = {
+	REG_VGAG,
+	0x31,	0xff
+};
+
+// Initialization : FMCG=2, GP2=0, GP1=0
+static u8 mt2060_config2[] = {
+	REG_MISC_CTRL,
+	0x20
+};
+
+// The power-up values are :
+// LNABAND=3, NUM1=0x3C, DIV1=0x74, NUM2=0x1080, DIV2=0x49 --> LO1=1.871GHz LO2=1.176250GHz
+static u8 mt2060_config3[] = {
+	REG_LO1C1,
+	0x3F,	0x74,	0x00,	0x08,	0x93
+};
+
+int mt2060_init(struct mt2060_state *state)
+{
+	if (mt2060_writeregs(state,mt2060_config1,sizeof(mt2060_config1)))
+		return -EREMOTEIO;
+	if (mt2060_writeregs(state,mt2060_config2,sizeof(mt2060_config2)))
+		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 IF1  (1220*1000) // IF1 frequency = 1.220 GHz
+#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)
+{
+	u32 freq;
+	int lnaband;
+	u32 f_lo1,f_lo2;
+	u32 div1,num1,div2,num2;
+	u8  b[8];
+	int ret=0;
+
+	freq=fep->frequency / 1000; // Hz -> kHz
+
+	f_lo1=freq + IF1;
+	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<=95 *1000) lnaband=0xB0; else
+	if (freq<=180*1000) lnaband=0xA0; else
+	if (freq<=260*1000) lnaband=0x90; else
+	if (freq<=335*1000) lnaband=0x80; else
+	if (freq<=425*1000) lnaband=0x70; else
+	if (freq<=480*1000) lnaband=0x60; else
+	if (freq<=570*1000) lnaband=0x50; else
+	if (freq<=645*1000) lnaband=0x40; else
+	if (freq<=730*1000) lnaband=0x30; else
+	if (freq<=810*1000) 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("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);
+	return ret;
+}
+EXPORT_SYMBOL(mt2060_set);
+
+/* 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)
+{
+	u8 id;
+	memset(state,0,sizeof(struct mt2060_state));
+
+	state->config = config;
+	state->i2c = i2c;
+
+	if (mt2060_readreg(state,REG_PART_REV,&id) != 0)
+		return -ENODEV;
+
+	if (id!=PART_REV)
+		return -ENODEV;
+
+	if (mt2060_writereg(state,REG_PART_REV,0) != 0)
+		return -ENODEV;
+
+	if (mt2060_readreg(state,REG_PART_REV,&id) != 0)
+		return -ENODEV;
+
+	if (id!=PART_REV)
+		return -ENODEV;
+
+	printk(KERN_INFO "MT2060: Identified Microtune MT2060 chip\n");
+	return 0;
+}
+EXPORT_SYMBOL(mt2060_attach);
+
+MODULE_AUTHOR("Olivier DANET");
+MODULE_DESCRIPTION("Microtune MT2060 silicon tuner driver");
+MODULE_LICENSE("GPL");