path: root/drivers/media/dvb/frontends/dib3000mc.c

/*
 * Driver for DiBcom DiB3000MC/P-demodulator.
 *
 * Copyright (C) 2004-7 DiBcom (http://www.dibcom.fr/)
 * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@desy.de)
 *
 * This code is partially based on the previous dib3000mc.c .
 *
 * 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, version 2.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>

#include "dvb_frontend.h"

#include "dib3000mc.h"

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "turn on debugging (default: 0)");

static int buggy_sfn_workaround;
module_param(buggy_sfn_workaround, int, 0644);
MODULE_PARM_DESC(buggy_sfn_workaround, "Enable work-around for buggy SFNs (default: 0)");

#define dprintk(args...) do { if (debug) { printk(KERN_DEBUG "DiB3000MC/P:"); printk(args); printk("\n"); } } while (0)

struct dib3000mc_state {
	struct dvb_frontend demod;
	struct dib3000mc_config *cfg;

	u8 i2c_addr;
	struct i2c_adapter *i2c_adap;

	struct dibx000_i2c_master i2c_master;

	u32 timf;

	fe_bandwidth_t current_bandwidth;

	u16 dev_id;

	u8 sfn_workaround_active :1;
};

static u16 dib3000mc_read_word(struct dib3000mc_state *state, u16 reg)
{
	u8 wb[2] = { (reg >> 8) | 0x80, reg & 0xff };
	u8 rb[2];
	struct i2c_msg msg[2] = {
		{ .addr = state->i2c_addr >> 1, .flags = 0,        .buf = wb, .len = 2 },
		{ .addr = state->i2c_addr >> 1, .flags = I2C_M_RD, .buf = rb, .len = 2 },
	};

	if (i2c_transfer(state->i2c_adap, msg, 2) != 2)
		dprintk("i2c read error on %d\n",reg);

	return (rb[0] << 8) | rb[1];
}

static int dib3000mc_write_word(struct dib3000mc_state *state, u16 reg, u16 val)
{
	u8 b[4] = {
		(reg >> 8) & 0xff, reg & 0xff,
		(val >> 8) & 0xff, val & 0xff,
	};
	struct i2c_msg msg = {
		.addr = state->i2c_addr >> 1, .flags = 0, .buf = b, .len = 4
	};
	return i2c_transfer(state->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
}

static int dib3000mc_identify(struct dib3000mc_state *state)
{
	u16 value;
	if ((value = dib3000mc_read_word(state, 1025)) != 0x01b3) {
		dprintk("-E-  DiB3000MC/P: wrong Vendor ID (read=0x%x)\n",value);
		return -EREMOTEIO;
	}

	value = dib3000mc_read_word(state, 1026);
	if (value != 0x3001 && value != 0x3002) {
		dprintk("-E-  DiB3000MC/P: wrong Device ID (%x)\n",value);
		return -EREMOTEIO;
	}
	state->dev_id = value;

	dprintk("-I-  found DiB3000MC/P: %x\n",state->dev_id);

	return 0;
}

static int dib3000mc_set_timing(struct dib3000mc_state *state, s16 nfft, u32 bw, u8 update_offset)
{
	u32 timf;

	if (state->timf == 0) {
		timf = 1384402; // default value for 8MHz
		if (update_offset)
			msleep(200); // first time we do an update
	} else
		timf = state->timf;

	timf *= (bw / 1000);

	if (update_offset) {
		s16 tim_offs = dib3000mc_read_word(state, 416);

		if (tim_offs &  0x2000)
			tim_offs -= 0x4000;

		if (nfft == TRANSMISSION_MODE_2K)
			tim_offs *= 4;

		timf += tim_offs;
		state->timf = timf / (bw / 1000);
	}

	dprintk("timf: %d\n", timf);

	dib3000mc_write_word(state, 23, (u16) (timf >> 16));
	dib3000mc_write_word(state, 24, (u16) (timf      ) & 0xffff);

	return 0;
}

static int dib3000mc_setup_pwm_state(struct dib3000mc_state *state)
{
	u16 reg_51, reg_52 = state->cfg->agc->setup & 0xfefb;
    if (state->cfg->pwm3_inversion) {
		reg_51 =  (2 << 14) | (0 << 10) | (7 << 6) | (2 << 2) | (2 <<