path: root/drivers/media/dvb/frontends/cx24123.c

/*
    Conexant cx24123/cx24109 - DVB QPSK Satellite demod/tuner driver

    Copyright (C) 2005 Steven Toth <stoth@hauppauge.com>

    Support for KWorld DVB-S 100 by Vadim Catana <skystar@moldova.cc>

    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.
*/

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>

#include "dvb_frontend.h"
#include "cx24123.h"

#define XTAL 10111000

static int force_band;
static int debug;
#define dprintk(args...) \
	do { \
		if (debug) printk (KERN_DEBUG "cx24123: " args); \
	} while (0)

struct cx24123_state
{
	struct i2c_adapter* i2c;
	struct dvb_frontend_ops ops;
	const struct cx24123_config* config;

	struct dvb_frontend frontend;

	u32 lastber;
	u16 snr;
	u8  lnbreg;

	/* Some PLL specifics for tuning */
	u32 VCAarg;
	u32 VGAarg;
	u32 bandselectarg;
	u32 pllarg;
	u32 FILTune;

	/* The Demod/Tuner can't easily provide these, we cache them */
	u32 currentfreq;
	u32 currentsymbolrate;
};

/* Various tuner defaults need to be established for a given symbol rate Sps */
static struct
{
	u32 symbolrate_low;
	u32 symbolrate_high;
	u32 VCAprogdata;
	u32 VGAprogdata;
	u32 FILTune;
} cx24123_AGC_vals[] =
{
	{
		.symbolrate_low		= 1000000,
		.symbolrate_high	= 4999999,
		/* the specs recommend other values for VGA offsets,
		   but tests show they are wrong */
		.VGAprogdata		= (1 << 19) | (0x180 << 9) | 0x1e0,
		.VCAprogdata		= (2 << 19) | (0x07 << 9) | 0x07,
		.FILTune		= 0x27f /* 0.41 V */
	},
	{
		.symbolrate_low		=  5000000,
		.symbolrate_high	= 14999999,
		.VGAprogdata		= (1 << 19) | (0x180 << 9) | 0x1e0,
		.VCAprogdata		= (2 << 19) | (0x07 << 9) | 0x1f,
		.FILTune		= 0x317 /* 0.90 V */
	},
	{
		.symbolrate_low		= 15000000,
		.symbolrate_high	= 45000000,
		.VGAprogdata		= (1 << 19) | (0x100 << 9) | 0x180,
		.VCAprogdata		= (2 << 19) | (0x07 << 9) | 0x3f,
		.FILTune		= 0x145 /* 2.70 V */
	},
};

/*
 * Various tuner defaults need to be established for a given frequency kHz.
 * fixme: The bounds on the bands do not match the doc in real life.
 * fixme: Some of them have been moved, other might need adjustment.
 */
static struct
{
	u32 freq_low;
	u32 freq_high;
	u32 VCOdivider;
	u32 progdata;
} cx24123_bandselect_vals[] =
{
	/* band 1 */
	{
		.freq_low	= 950000,
		.freq_high	= 1074999,
		.VCOdivider	= 4,
		.progdata	= (0 << 19) | (0 << 9) | 0x40,
	},

	/* band 2 */
	{
		.freq_low	= 1075000,
		.freq_high	= 1177999,
		.VCOdivider	= 4,
		.progdata	= (0 << 19) | (0 << 9) | 0x80,
	},

	/* band 3 */
	{
		.freq_low	= 1178000,
		.freq_high	= 1295999,
		.VCOdivider	= 2,
		.progdata	= (0 << 19) | (1 << 9) | 0x01<