path: root/drivers/media/dvb/frontends/s5h1420.c

/*
 * Driver for
 *    Samsung S5H1420 and
 *    PnpNetwork PN1010 QPSK Demodulator
 *
 * Copyright (C) 2005 Andrew de Quincey <adq_dvb@lidskialf.net>
 * Copyright (C) 2005-8 Patrick Boettcher <pb@linuxtv.org>
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <asm/div64.h>

#include <linux/i2c.h>


#include "dvb_frontend.h"
#include "s5h1420.h"
#include "s5h1420_priv.h"

#define TONE_FREQ 22000

struct s5h1420_state {
	struct i2c_adapter* i2c;
	const struct s5h1420_config* config;

	struct dvb_frontend frontend;
	struct i2c_adapter tuner_i2c_adapter;

	u8 CON_1_val;

	u8 postlocked:1;
	u32 fclk;
	u32 tunedfreq;
	fe_code_rate_t fec_inner;
	u32 symbol_rate;

	/* FIXME: ugly workaround for flexcop's incapable i2c-controller
	 * it does not support repeated-start, workaround: write addr-1
	 * and then read
	 */
	u8 shadow[255];
};

static u32 s5h1420_getsymbolrate(struct s5h1420_state* state);
static int s5h1420_get_tune_settings(struct dvb_frontend* fe,
				     struct dvb_frontend_tune_settings* fesettings);


static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable debugging");

#define dprintk(x...) do { \
	if (debug) \
		printk(KERN_DEBUG "S5H1420: " x); \
} while (0)

static u8 s5h1420_readreg(struct s5h1420_state *state, u8 reg)
{
	int ret;
	u8 b[2];
	struct i2c_msg msg[] = {
		{ .addr = state->config->demod_address, .flags = 0, .buf = b, .len = 2 },
		{ .addr = state->config->demod_address, .flags = 0, .buf = &reg, .len = 1 },
		{ .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b, .len = 1 },
	};

	b[0] = (reg - 1) & 0xff;
	b[1] = state->shadow[(reg - 1) & 0xff];

	if (state->config->repeated_start_workaround) {
		ret = i2c_transfer(state->i2c, msg, 3);
		if (ret != 3)
			return ret;
	} else {
		ret = i2c_transfer(state->i2c, &msg[1], 2);
		if (ret != 2)
			return ret;
	}

	/* dprintk("rd(%02x): %02x %02x\n", state->config->demod_address, reg, b[0]); */

	return b[0];
}

static int s5h1420_writereg (struct s5h1420_state* state, u8 reg, u8 data)
{
	u8 buf[] = { reg, data };
	struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
	int err;

	/* dprintk("wr(%02x): %02x %02x\n", state->config->demod_address, reg, data); */
	err = i2c_transfer(state->i2c, &msg, 1);
	if (err != 1) {
		dprintk("%s: writereg error (err == %i, reg == 0x%02x, data == 0x%02x)\n", __func__, err, reg, data);
		return -EREMOTEIO;
	}
	state->shadow[reg] = data;

	return 0;
}

static int s5h1420_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltage)
{
	struct s5h1420_state* state = fe->demodulator_priv;

	dprintk("enter %s\n", __func__);

	switch(voltage) {
	case SEC_VOLTAGE_13:
		s5h1420_writereg(state, 0x3c,
				 (s5h1420_readreg(state, 0x3c) & 0xfe) | 0x02);
		break;

	case SEC_VOLTAGE_18:
		s5h1420_writereg(state, 0x3c, s5h1420_readreg(state, 0x3c) | 0x03);
		break;

	case SEC_VOLTAGE_OFF:
		s5h1420_writereg(state, 0x3c, s5h1420_readreg(state, 0x3c) & 0xfd);
		break;
	}

	dprintk("leave %s\n", __func__);
	return 0;
}

static int