stv0299.c

linux-2.6.15.6

/*
    Driver for ST STV0299 demodulator

    Copyright (C) 2001-2002 Convergence Integrated Media GmbH
	<[e-mail]>,
	<[e-mail]>,
	<[e-mail]>


    Philips SU1278/SH

    Copyright (C) 2002 by Peter Schildmann <[e-mail]>


    LG TDQF-S001F

    Copyright (C) 2002 Felix Domke <[e-mail]>
		     & Andreas Oberritter <[e-mail]>


    Support for Samsung TBMU24112IMB used on Technisat SkyStar2 rev. 2.6B

    Copyright (C) 2003 Vadim Catana <[e-mail]>:

    Support for Philips SU1278 on Technotrend hardware

    Copyright (C) 2004 Andrew de Quincey <[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/moduleparam.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <asm/div64.h>

#include "dvb_frontend.h"
#include "stv0299.h"

struct stv0299_state {
	struct i2c_adapter* i2c;
	struct dvb_frontend_ops ops;
	const struct stv0299_config* config;
	struct dvb_frontend frontend;

	u8 initialised:1;
	u32 tuner_frequency;
	u32 symbol_rate;
	fe_code_rate_t fec_inner;
	int errmode;
};

#define STATUS_BER 0
#define STATUS_UCBLOCKS 1

static int debug;
static int debug_legacy_dish_switch;
#define dprintk(args...) \
	do { \
		if (debug) printk(KERN_DEBUG "stv0299: " args); \
	} while (0)


static int stv0299_writeregI (struct stv0299_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) ? -EREMOTEIO : 0;
}

int stv0299_writereg (struct dvb_frontend* fe, u8 reg, u8 data)
{
	struct stv0299_state* state = fe->demodulator_priv;

	return stv0299_writeregI(state, reg, data);
}

static u8 stv0299_readreg (struct stv0299_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 } };

	ret = i2c_transfer (state->i2c, msg, 2);

	if (ret != 2)
		dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n",
				__FUNCTION__, reg, ret);

	return b1[0];
}

static int stv0299_readregs (struct stv0299_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 } };

	ret = i2c_transfer (state->i2c, msg, 2);

	if (ret != 2)
		dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);

	return ret == 2 ? 0 : ret;
}

static int stv0299_set_FEC (struct stv0299_state* state, fe_code_rate_t fec)
{
	dprintk ("%s\n", __FUNCTION__);

	switch (fec) {
	case FEC_AUTO:
	{
		return stv0299_writeregI (state, 0x31, 0x1f);
	}
	case FEC_1_2:
	{
		return stv0299_writeregI (state, 0x31, 0x01);
	}
	case FEC_2_3:
	{
		return stv0299_writeregI (state, 0x31, 0x02);
	}
	case FEC_3_4:
	{
		return stv0299_writeregI (state, 0x31, 0x04);
	}
	case FEC_5_6:
	{
		return stv0299_writeregI (state, 0x31, 0x08);
	}
	case FEC_7_8:
	{
		return stv0299_writeregI (state, 0x31, 0x10);
	}
	default:
	{
		return -EINVAL;
	}
    }
}

static fe_code_rate_t stv0299_get_fec (struct stv0299_state* state)
{
	static fe_code_rate_t fec_tab [] = { FEC_2_3, FEC_3_4, FEC_5_6,
					     FEC_7_8, FEC_1_2 };
	u8 index;

	dprintk ("%s\n", __FUNCTION__);

	index = stv0299_readreg (state, 0x1b);
	index &= 0x7;

	if (index > 4)
		return FEC_AUTO;

	return fec_tab [index];
}

static int stv0299_wait_diseqc_fifo (struct stv0299_state* state, int timeout)
{
	unsigned long start = jiffies;

	dprintk ("%s\n", __FUNCTION__);

	while (stv0299_readreg(state, 0x0a) & 1) {
		if (jiffies - start > timeout) {
			dprintk ("%s: timeout!!\n", __FUNCTION__);
			return -ETIMEDOUT;
		}
		msleep(10);
	};

	return 0;
}

static int stv0299_wait_diseqc_idle (struct stv0299_state* state, int timeout)
{
	unsigned long start = jiffies;

	dprintk ("%s\n", __FUNCTION__);

	while ((stv0299_readreg(state, 0x0a) & 3) != 2 ) {
		if (jiffies - start > timeout) {
			dprintk ("%s: timeout!!\n", __FUNCTION__);
			return -ETIMEDOUT;
		}
		msleep(10);
	};

	return 0;
}

static int stv0299_set_symbolrate (struct dvb_frontend* fe, u32 srate)
{
	struct stv0299_state* state = fe->demodulator_priv;
	u64 big = srate;
	u32 ratio;

	// check rate is within limits
	if ((srate < 1000000) || (srate > 45000000)) return -EINVAL;

	// calculate value to program
	big = big << 20;
	big += (state->config->mclk-1); // round correctly
	do_div(big, state->config->mclk);
	ratio = big << 4;

	return state->config->set_symbol_rate(fe, srate, ratio);
}

static int stv0299_get_symbolrate (struct stv0299_state* state)
{
	u32 Mclk = state->config->mclk / 4096L;
	u32 srate;
	s32 offset;
	u8 sfr[3];
	s8 rtf;

	dprintk ("%s\n", __FUNCTION__);

	stv0299_readregs (state, 0x1f, sfr, 3);
	stv0299_readregs (state, 0x1a, &rtf, 1);

	srate = (sfr[0] << 8) | sfr[1];
	srate *= Mclk;
	srate /= 16;
	srate += (sfr[2] >> 4) * Mclk / 256;
	offset = (s32) rtf * (srate / 4096L);
	offset /= 128;

	dprintk ("%s : srate = %i\n", __FUNCTION__, srate);
	dprintk ("%s : ofset = %i\n", __FUNCTION__, offset);

	srate += offset;

	srate += 1000;
	srate /= 2000;
	srate *= 2000;

	return srate;
}

static int stv0299_send_diseqc_msg (struct dvb_frontend* fe,
				    struct dvb_diseqc_master_cmd *m)
{
	struct stv0299_state* state = fe->demodulator_priv;
	u8 val;
	int i;

	dprintk ("%s\n", __FUNCTION__);

	if (stv0299_wait_diseqc_idle (state, 100) < 0)
		return -ETIMEDOUT;

	val = stv0299_readreg (state, 0x08);

	if (stv0299_writeregI (state, 0x08, (val & ~0x7) | 0x6))  /* DiSEqC mode */
		return -EREMOTEIO;

	for (i=0; i<m->msg_len; i++) {
		if (stv0299_wait_diseqc_fifo (state, 100) < 0)
			return -ETIMEDOUT;

		if (stv0299_writeregI (state, 0x09, m->msg[i]))
			return -EREMOTEIO;
	}

	if (stv0299_wait_diseqc_idle (state, 100) < 0)
		return -ETIMEDOUT;

	return 0;
}

static int stv0299_send_diseqc_burst (struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
{
	struct stv0299_state* state = fe->demodulator_priv;
	u8 val;

	dprintk ("%s\n", __FUNCTION__);

	if (stv0299_wait_diseqc_idle (state, 100) < 0)
		return -ETIMEDOUT;

	val = stv0299_readreg (state, 0x08);

	if (stv0299_writeregI (state, 0x08, (val & ~0x7) | 0x2))	/* burst mode */
		return -EREMOTEIO;

	if (stv0299_writeregI (state, 0x09, burst == SEC_MINI_A ? 0x00 : 0xff))
		return -EREMOTEIO;

	if (stv0299_wait_diseqc_idle (state, 100) < 0)
		return -ETIMEDOUT;

	if (stv0299_writeregI (state, 0x08, val))
		return -EREMOTEIO;

	return 0;
}

static int stv0299_set_tone (struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
{
	struct stv0299_state* state = fe->demodulator_priv;
	u8 val;

	if (stv0299_wait_diseqc_idle (state, 100) < 0)
		return -ETIMEDOUT;

	val = stv0299_readreg (state, 0x08);

	switch (tone) {
	case SEC_TONE_ON:
		return stv0299_writeregI (state, 0x08, val | 0x3);

	case SEC_TONE_OFF:
		return stv0299_writeregI (state, 0x08, (val & ~0x3) | 0x02);

	default:
		return -EINVAL;
	}
}

static int stv0299_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltage)
{
	struct stv0299_state* state = fe->demodulator_priv;
	u8 reg0x08;
	u8 reg0x0c;

	dprintk("%s: %s\n", __FUNCTION__,
		voltage == SEC_VOLTAGE_13 ? "SEC_VOLTAGE_13" :
		voltage == SEC_VOLTAGE_18 ? "SEC_VOLTAGE_18" : "??");

	reg0x08 = stv0299_readreg (state, 0x08);