path: root/drivers/media/dvb/frontends/nxt200x.c

/*
 *    Support for NXT2002 and NXT2004 - VSB/QAM
 *
 *    Copyright (C) 2005 Kirk Lapray <kirk.lapray@gmail.com>
 *    Copyright (C) 2006 Michael Krufky <mkrufky@m1k.net>
 *    based on nxt2002 by Taylor Jacob <rtjacob@earthlink.net>
 *    and nxt2004 by Jean-Francois Thibert <jeanfrancois@sagetv.com>
 *
 *    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.
 *
*/

/*
 *                      NOTES ABOUT THIS DRIVER
 *
 * This Linux driver supports:
 *   B2C2/BBTI Technisat Air2PC - ATSC (NXT2002)
 *   AverTVHD MCE A180 (NXT2004)
 *   ATI HDTV Wonder (NXT2004)
 *
 * This driver needs external firmware. Please use the command
 * "<kerneldir>/Documentation/dvb/get_dvb_firmware nxt2002" or
 * "<kerneldir>/Documentation/dvb/get_dvb_firmware nxt2004" to
 * download/extract the appropriate firmware, and then copy it to
 * /usr/lib/hotplug/firmware/ or /lib/firmware/
 * (depending on configuration of firmware hotplug).
 */
#define NXT2002_DEFAULT_FIRMWARE "dvb-fe-nxt2002.fw"
#define NXT2004_DEFAULT_FIRMWARE "dvb-fe-nxt2004.fw"
#define CRC_CCIT_MASK 0x1021

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

#include "dvb_frontend.h"
#include "dvb-pll.h"
#include "nxt200x.h"

struct nxt200x_state {

	struct i2c_adapter* i2c;
	const struct nxt200x_config* config;
	struct dvb_frontend frontend;

	/* demodulator private data */
	nxt_chip_type demod_chip;
	u8 initialised:1;
};

static int debug;
#define dprintk(args...) \
	do { \
		if (debug) printk(KERN_DEBUG "nxt200x: " args); \
	} while (0)

static int i2c_writebytes (struct nxt200x_state* state, u8 addr, u8 *buf, u8 len)
{
	int err;
	struct i2c_msg msg = { .addr = addr, .flags = 0, .buf = buf, .len = len };

	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
		printk (KERN_WARNING "nxt200x: %s: i2c write error (addr 0x%02x, err == %i)\n",
			__FUNCTION__, addr, err);
		return -EREMOTEIO;
	}
	return 0;
}

static u8 i2c_readbytes (struct nxt200x_state* state, u8 addr, u8* buf, u8 len)
{
	int err;
	struct i2c_msg msg = { .addr = addr, .flags = I2C_M_RD, .buf = buf, .len = len };

	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
		printk (KERN_WARNING "nxt200x: %s: i2c read error (addr 0x%02x, err == %i)\n",
			__FUNCTION__, addr, err);
		return -EREMOTEIO;
	}
	return 0;
}

static int nxt200x_writebytes (struct nxt200x_state* state, u8 reg, u8 *buf, u8 len)
{
	u8 buf2 [len+1];