stv0297.c

linux-2.6.15.6

/*
    Driver for STV0297 demodulator

    Copyright (C) 2004 Andrew de Quincey <[e-mail]>
    Copyright (C) 2003-2004 Dennis Noermann <[e-mail]>

    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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/slab.h>

#include "dvb_frontend.h"
#include "stv0297.h"

struct stv0297_state {
	struct i2c_adapter *i2c;
	struct dvb_frontend_ops ops;
	const struct stv0297_config *config;
	struct dvb_frontend frontend;

	unsigned long base_freq;
};

#if 1
#define dprintk(x...) printk(x)
#else
#define dprintk(x...)
#endif

#define STV0297_CLOCK_KHZ   28900


static int stv0297_writereg(struct stv0297_state *state, u8 reg, u8 data)
{
	int ret;
	u8 buf[] = { reg, data };
	struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 2 };

	ret = i2c_transfer(state->i2c, &msg, 1);

	if (ret != 1)
		dprintk("%s: writereg error (reg == 0x%02x, val == 0x%02x, "
			"ret == %i)\n", __FUNCTION__, reg, data, ret);

	return (ret != 1) ? -1 : 0;
}

static int stv0297_readreg(struct stv0297_state *state, u8 reg)
{
	int ret;
	u8 b0[] = { reg };
	u8 b1[] = { 0 };
	struct i2c_msg msg[] = { {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len =
				  1},
	{.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
	};

	// this device needs a STOP between the register and data
	if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) {
		dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg, ret);
		return -1;
	}
	if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) {
		dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg, ret);
		return -1;
	}

	return b1[0];
}

static int stv0297_writereg_mask(struct stv0297_state *state, u8 reg, u8 mask, u8 data)
{
	int val;

	val = stv0297_readreg(state, reg);
	val &= ~mask;
	val |= (data & mask);
	stv0297_writereg(state, reg, val);

	return 0;
}

static int stv0297_readregs(struct stv0297_state *state, u8 reg1, u8 * b, u8 len)
{
	int ret;
	struct i2c_msg msg[] = { {.addr = state->config->demod_address,.flags = 0,.buf =
				  &reg1,.len = 1},
	{.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b,.len = len}
	};

	// this device needs a STOP between the register and data
	if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) {
		dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg1, ret);
		return -1;
	}
	if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) {
		dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __FUNCTION__, reg1, ret);
		return -1;
	}

	return 0;
}

static u32 stv0297_get_symbolrate(struct stv0297_state *state)
{
	u64 tmp;

	tmp = stv0297_readreg(state, 0x55);
	tmp |= stv0297_readreg(state, 0x56) << 8;
	tmp |= stv0297_readreg(state, 0x57) << 16;
	tmp |= stv0297_readreg(state, 0x58) << 24;

	tmp *= STV0297_CLOCK_KHZ;
	tmp >>= 32;

	return (u32) tmp;
}

static void stv0297_set_symbolrate(struct stv0297_state *state, u32 srate)
{
	long tmp;

	tmp = 131072L * srate;	/* 131072 = 2^17  */
	tmp = tmp / (STV0297_CLOCK_KHZ / 4);	/* 1/4 = 2^-2 */
	tmp = tmp * 8192L;	/* 8192 = 2^13 */

	stv0297_writereg(state, 0x55, (unsigned char) (tmp & 0xFF));
	stv0297_writereg(state, 0x56, (unsigned char) (tmp >> 8));
	stv0297_writereg(state, 0x57, (unsigned char) (tmp >> 16));
	stv0297_writereg(state, 0x58, (unsigned char) (tmp >> 24));
}

static void stv0297_set_sweeprate(struct stv0297_state *state, short fshift, long symrate)
{
	long tmp;

	tmp = (long) fshift *262144L;	/* 262144 = 2*18 */
	tmp /= symrate;
	tmp *= 1024;		/* 1024 = 2*10   */

	// adjust
	if (tmp >= 0) {
		tmp += 500000;
	} else {
		tmp -= 500000;
	}
	tmp /= 1000000;

	stv0297_writereg(state, 0x60, tmp & 0xFF);
	stv0297_writereg_mask(state, 0x69, 0xF0, (tmp >> 4) & 0xf0);
}

static void stv0297_set_carrieroffset(struct stv0297_state *state, long offset)
{
	long tmp;

	/* symrate is hardcoded to 10000 */
	tmp = offset * 26844L;	/* (2**28)/10000 */
	if (tmp < 0)
		tmp += 0x10000000;
	tmp &= 0x0FFFFFFF;

	stv0297_writereg(state, 0x66, (unsigned char) (tmp & 0xFF));
	stv0297_writereg(state, 0x67, (unsigned char) (tmp >> 8));
	stv0297_writereg(state, 0x68, (unsigned char) (tmp >> 16));
	stv0297_writereg_mask(state, 0x69, 0x0F, (tmp >> 24) & 0x0f);
}

/*
static long stv0297_get_carrieroffset(struct stv0297_state *state)
{
	s64 tmp;

	stv0297_writereg(state, 0x6B, 0x00);

	tmp = stv0297_readreg(state, 0x66);
	tmp |= (stv0297_readreg(state, 0x67) << 8);
	tmp |= (stv0297_readreg(state, 0x68) << 16);
	tmp |= (stv0297_readreg(state, 0x69) & 0x0F) << 24;

	tmp *= stv0297_get_symbolrate(state);
	tmp >>= 28;

	return (s32) tmp;
}
*/

static void stv0297_set_initialdemodfreq(struct stv0297_state *state, long freq)
{
	s32 tmp;

	if (freq > 10000)
		freq -= STV0297_CLOCK_KHZ;

	tmp = (STV0297_CLOCK_KHZ * 1000) / (1 << 16);
	tmp = (freq * 1000) / tmp;
	if (tmp > 0xffff)
		tmp = 0xffff;

	stv0297_writereg_mask(state, 0x25, 0x80, 0x80);
	stv0297_writereg(state, 0x21, tmp >> 8);
	stv0297_writereg(state, 0x20, tmp);
}

static int stv0297_set_qam(struct stv0297_state *state, fe_modulation_t modulation)
{
	int val = 0;

	switch (modulation) {
	case QAM_16:
		val = 0;
		break;

	case QAM_32:
		val = 1;
		break;

	case QAM_64:
		val = 4;
		break;

	case QAM_128:
		val = 2;
		break;

	case QAM_256:
		val = 3;
		break;

	default:
		return -EINVAL;
	}

	stv0297_writereg_mask(state, 0x00, 0x70, val << 4);

	return 0;
}

static int stv0297_set_inversion(struct stv0297_state *state, fe_spectral_inversion_t inversion)
{
	int val = 0;

	switch (inversion) {
	case INVERSION_OFF:
		val = 0;
		break;

	case INVERSION_ON:
		val = 1;
		break;

	default:
		return -EINVAL;
	}

	stv0297_writereg_mask(state, 0x83, 0x08, val << 3);

	return 0;
}

int stv0297_enable_plli2c(struct dvb_frontend *fe)
{
	struct stv0297_state *state = fe->demodulator_priv;

	stv0297_writereg(state, 0x87, 0x78);
	stv0297_writereg(state, 0x86, 0xc8);

	return 0;
}

static int stv0297_init(struct dvb_frontend *fe)
{
	struct stv0297_state *state = fe->demodulator_priv;
	int i;

	/* load init table */
	for (i=0; !(state->config->inittab[i] == 0xff && state->config->inittab[i+1] == 0xff); i+=2)
		stv0297_writereg(state, state->config->inittab[i], state->config->inittab[i+1]);
	msleep(200);

	if (state->config->pll_init)
		state->config->pll_init(fe);

	return 0;
}

static int stv0297_sleep(struct dvb_frontend *fe)
{
	struct stv0297_state *state = fe->demodulator_priv;

	stv0297_writereg_mask(state, 0x80, 1, 1);

	return 0;
}

static int stv0297_read_status(struct dvb_frontend *fe, fe_status_t * status)
{
	struct stv0297_state *state = fe->demodulator_priv;

	u8 sync = stv0297_readreg(state, 0xDF);

	*status = 0;
	if (sync & 0x80)
		*status |=
			FE_HAS_SYNC | FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_LOCK;
	return 0;
}

static int stv0297_read_ber(struct dvb_frontend *fe, u32 * ber)
{
	struct stv0297_state *state = fe->demodulator_priv;
	u8 BER[3];

	stv0297_writereg(state, 0xA0, 0x80);	// Start Counting bit errors for 4096 Bytes
	mdelay(25);		// Hopefully got 4096 Bytes
	stv0297_readregs(state, 0xA0, BER, 3);
	mdelay(25);
	*ber = (BER[2] << 8 | BER[1]) / (8 * 4096);

	return 0;
}


static int stv0297_read_signal_strength(struct dvb_frontend *fe, u16 * strength)
{
	struct stv0297_state *state = fe->demodulator_priv;
	u8 STRENGTH[2];