drivers/media/dvb/frontends/au8522.c - linux - Git at Google

 /*
     Auvitek AU8522 QAM/8VSB demodulator driver

     Copyright (C) 2008 Steven Toth <stoth@hauppauge.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.

 */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include "dvb_frontend.h"
 #include "dvb-pll.h"
 #include "au8522.h"

 struct au8522_state {

 	struct i2c_adapter* i2c;

 	/* configuration settings */
 	const struct au8522_config* config;

 	struct dvb_frontend frontend;

 	u32 current_frequency;
 	fe_modulation_t current_modulation;

 };

 static int debug = 0;
 #define dprintk	if (debug) printk

 /* 16 bit registers, 8 bit values */
 static int au8522_writereg(struct au8522_state* state, u16 reg, u8 data)
 {
 	int ret;
 	u8 buf [] = { reg >> 8, reg & 0xff, data };

 	struct i2c_msg msg = { .addr = state->config->demod_address,
 			       .flags = 0, .buf = buf, .len = 3 };

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

 	if (ret != 1)
 		printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
 		       "ret == %i)\n", __FUNCTION__, reg, data, ret);

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

 static u8 au8522_readreg(struct au8522_state* state, u16 reg)
 {
 	int ret;
 	u8 b0 [] = { reg >> 8, reg & 0xff };
 	u8 b1 [] = { 0 };

 	struct i2c_msg msg [] = {
 		{ .addr = state->config->demod_address, .flags = 0,
 		  .buf = b0, .len = 2 },
 		{ .addr = state->config->demod_address, .flags = I2C_M_RD,
 		  .buf = b1, .len = 1 } };

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

 	if (ret != 2)
 		printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
 	return b1[0];
 }

 static int au8522_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 {
 	struct au8522_state* state = fe->demodulator_priv;

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

 	if (enable)
 		return au8522_writereg(state, 0x106, 1);
 	else
 		return au8522_writereg(state, 0x106, 0);
 }

 static int au8522_enable_modulation(struct dvb_frontend* fe,
 	fe_modulation_t m)
 {
 	struct au8522_state* state = fe->demodulator_priv;

 	dprintk("%s(0x%08x)\n", __FUNCTION__, m);

 	switch(m) {
 	case VSB_8:
 		dprintk("%s() VSB_8\n", __FUNCTION__);

 		//au8522_writereg(state, 0x410b, 0x84); // Serial

 		//au8522_writereg(state, 0x8090, 0x82);
 		au8522_writereg(state, 0x8090, 0x84);
 		au8522_writereg(state, 0x4092, 0x11);
 		au8522_writereg(state, 0x2005, 0x00);
 		au8522_writereg(state, 0x8091, 0x80);

 		au8522_writereg(state, 0x80a3, 0x0c);
 		au8522_writereg(state, 0x80a4, 0xe8);
 		au8522_writereg(state, 0x8081, 0xc4);
 		au8522_writereg(state, 0x80a5, 0x40);
 		au8522_writereg(state, 0x80a7, 0x40);
 		au8522_writereg(state, 0x80a6, 0x67);
 		au8522_writereg(state, 0x8262, 0x20);
 		au8522_writereg(state, 0x821c, 0x30);
 		au8522_writereg(state, 0x80d8, 0x1a);
 		au8522_writereg(state, 0x8227, 0xa0);
 		au8522_writereg(state, 0x8121, 0xff);
 		au8522_writereg(state, 0x80a8, 0xf0);
 		au8522_writereg(state, 0x80a9, 0x05);
 		au8522_writereg(state, 0x80aa, 0x77);
 		au8522_writereg(state, 0x80ab, 0xf0);
 		au8522_writereg(state, 0x80ac, 0x05);
 		au8522_writereg(state, 0x80ad, 0x77);
 		au8522_writereg(state, 0x80ae, 0x41);
 		au8522_writereg(state, 0x80af, 0x66);
 		au8522_writereg(state, 0x821b, 0xcc);
 		au8522_writereg(state, 0x821d, 0x80);
 		au8522_writereg(state, 0x80b5, 0xfb);
 		au8522_writereg(state, 0x80b6, 0x8e);
 		au8522_writereg(state, 0x80b7, 0x39);
 		au8522_writereg(state, 0x80a4, 0xe8);
 		au8522_writereg(state, 0x8231, 0x13);
 		break;
 	case QAM_64:
 	case QAM_256:
 		au8522_writereg(state, 0x80a3, 0x09);
 		au8522_writereg(state, 0x80a4, 0x00);
 		au8522_writereg(state, 0x8081, 0xc4);
 		au8522_writereg(state, 0x80a5, 0x40);
 		au8522_writereg(state, 0x80b5, 0xfb);
 		au8522_writereg(state, 0x80b6, 0x8e);
 		au8522_writereg(state, 0x80b7, 0x39);
 		au8522_writereg(state, 0x80aa, 0x77);
 		au8522_writereg(state, 0x80ad, 0x77);
 		au8522_writereg(state, 0x80a6, 0x67);
 		au8522_writereg(state, 0x8262, 0x20);
 		au8522_writereg(state, 0x821c, 0x30);
 		au8522_writereg(state, 0x80b8, 0x3e);
 		au8522_writereg(state, 0x80b9, 0xf0);
 		au8522_writereg(state, 0x80ba, 0x01);
 		au8522_writereg(state, 0x80bb, 0x18);
 		au8522_writereg(state, 0x80bc, 0x50);
 		au8522_writereg(state, 0x80bd, 0x00);
 		au8522_writereg(state, 0x80be, 0xea);
 		au8522_writereg(state, 0x80bf, 0xef);
 		au8522_writereg(state, 0x80c0, 0xfc);
 		au8522_writereg(state, 0x80c1, 0xbd);
 		au8522_writereg(state, 0x80c2, 0x1f);
 		au8522_writereg(state, 0x80c3, 0xfc);
 		au8522_writereg(state, 0x80c4, 0xdd);
 		au8522_writereg(state, 0x80c5, 0xaf);
 		au8522_writereg(state, 0x80c6, 0x00);
 		au8522_writereg(state, 0x80c7, 0x38);
 		au8522_writereg(state, 0x80c8, 0x30);
 		au8522_writereg(state, 0x80c9, 0x05);
 		au8522_writereg(state, 0x80ca, 0x4a);
 		au8522_writereg(state, 0x80cb, 0xd0);
 		au8522_writereg(state, 0x80cc, 0x01);
 		au8522_writereg(state, 0x80cd, 0xd9);
 		au8522_writereg(state, 0x80ce, 0x6f);
 		au8522_writereg(state, 0x80cf, 0xf9);
 		au8522_writereg(state, 0x80d0, 0x70);
 		au8522_writereg(state, 0x80d1, 0xdf);
 		au8522_writereg(state, 0x80d2, 0xf7);
 		au8522_writereg(state, 0x80d3, 0xc2);
 		au8522_writereg(state, 0x80d4, 0xdf);
 		au8522_writereg(state, 0x80d5, 0x02);
 		au8522_writereg(state, 0x80d6, 0x9a);
 		au8522_writereg(state, 0x80d7, 0xd0);
 		au8522_writereg(state, 0x8250, 0x0d);
 		au8522_writereg(state, 0x8251, 0xcd);
 		au8522_writereg(state, 0x8252, 0xe0);
 		au8522_writereg(state, 0x8253, 0x05);
 		au8522_writereg(state, 0x8254, 0xa7);
 		au8522_writereg(state, 0x8255, 0xff);
 		au8522_writereg(state, 0x8256, 0xed);
 		au8522_writereg(state, 0x8257, 0x5b);
 		au8522_writereg(state, 0x8258, 0xae);
 		au8522_writereg(state, 0x8259, 0xe6);
 		au8522_writereg(state, 0x825a, 0x3d);
 		au8522_writereg(state, 0x825b, 0x0f);
 		au8522_writereg(state, 0x825c, 0x0d);
 		au8522_writereg(state, 0x825d, 0xea);
 		au8522_writereg(state, 0x825e, 0xf2);
 		au8522_writereg(state, 0x825f, 0x51);
 		au8522_writereg(state, 0x8260, 0xf5);
 		au8522_writereg(state, 0x8261, 0x06);
 		au8522_writereg(state, 0x821a, 0x00);
 		au8522_writereg(state, 0x8546, 0x40);
 		au8522_writereg(state, 0x8210, 0x26);
 		au8522_writereg(state, 0x8211, 0xf6);
 		au8522_writereg(state, 0x8212, 0x84);
 		au8522_writereg(state, 0x8213, 0x02);
 		au8522_writereg(state, 0x8502, 0x01);
 		au8522_writereg(state, 0x8121, 0x04);
 		au8522_writereg(state, 0x8122, 0x04);
 		au8522_writereg(state, 0x852e, 0x10);
 		au8522_writereg(state, 0x80a4, 0xca);
 		au8522_writereg(state, 0x80a7, 0x40);
 		au8522_writereg(state, 0x8526, 0x01);
 		break;
 	default:
 		dprintk("%s() Invalid modulation\n", __FUNCTION__);
 		return -EINVAL;
 	}

 	state->current_modulation = m;

 	return 0;
 }

 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 static int au8522_set_frontend (struct dvb_frontend* fe,
 	struct dvb_frontend_parameters *p)
 {
 	struct au8522_state* state = fe->demodulator_priv;

 	dprintk("%s(frequency=%d)\n", __FUNCTION__, p->frequency);

 	state->current_frequency = p->frequency;

 	au8522_enable_modulation(fe, p->u.vsb.modulation);

 	/* Allow the demod to settle */
 	msleep(100);

 	if (fe->ops.tuner_ops.set_params) {
 		if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1);
 		fe->ops.tuner_ops.set_params(fe, p);
 		if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 	}

 	return 0;
 }

 /* Reset the demod hardware and reset all of the configuration registers
    to a default state. */
 static int au8522_init(struct dvb_frontend* fe)
 {
 	struct au8522_state* state = fe->demodulator_priv;
 	dprintk("%s()\n", __FUNCTION__);

 	au8522_writereg(state, 0xa4, 1 << 5);

 	au8522_i2c_gate_ctrl(fe, 1);

 	return 0;
 }

 static int au8522_read_status(struct dvb_frontend* fe, fe_status_t* status)
 {
 	struct au8522_state* state = fe->demodulator_priv;
 	u8 reg;
 	u32 tuner_status = 0;

 	*status = 0;

 	if (state->current_modulation == VSB_8) {
 		dprintk("%s() Checking VSB_8\n", __FUNCTION__);
 		//au8522_writereg(state, 0x80a4, 0x20);
 		reg = au8522_readreg(state, 0x4088);
 		if(reg & 0x01)
 			*status |= FE_HAS_VITERBI;
 		if(reg & 0x02)
 			*status |= FE_HAS_LOCK | FE_HAS_SYNC;
 	} else {
 		dprintk("%s() Checking QAM\n", __FUNCTION__);
 		reg = au8522_readreg(state, 0x4541);
 		if(reg & 0x80)
 			*status |= FE_HAS_VITERBI;
 		if(reg & 0x20)
 			*status |= FE_HAS_LOCK | FE_HAS_SYNC;
 	}

 	switch(state->config->status_mode) {
 	case AU8522_DEMODLOCKING:
 		dprintk("%s() DEMODLOCKING\n", __FUNCTION__);
 		if (*status & FE_HAS_VITERBI)
 			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 		break;
 	case AU8522_TUNERLOCKING:
 		/* Get the tuner status */
 		dprintk("%s() TUNERLOCKING\n", __FUNCTION__);
 		if (fe->ops.tuner_ops.get_status) {
 			if (fe->ops.i2c_gate_ctrl)
 				fe->ops.i2c_gate_ctrl(fe, 1);

 			fe->ops.tuner_ops.get_status(fe, &tuner_status);

 			if (fe->ops.i2c_gate_ctrl)
 				fe->ops.i2c_gate_ctrl(fe, 0);
 		}
 		if (tuner_status)
 			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 		break;
 	}

 	dprintk("%s() status 0x%08x\n", __FUNCTION__, *status);

 	return 0;
 }

 static int au8522_read_snr(struct dvb_frontend* fe, u16* snr)
 {
 	dprintk("%s()\n", __FUNCTION__);

 	*snr = 0;

 	return 0;
 }

 static int au8522_read_signal_strength(struct dvb_frontend* fe,
 					u16* signal_strength)
 {
 	return au8522_read_snr(fe, signal_strength);
 }

 static int au8522_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 {
 	struct au8522_state* state = fe->demodulator_priv;

 	*ucblocks = au8522_readreg(state, 0x4087);

 	return 0;
 }

 static int au8522_read_ber(struct dvb_frontend* fe, u32* ber)
 {
 	return au8522_read_ucblocks(fe, ber);
 }

 static int au8522_get_frontend(struct dvb_frontend* fe,
 				struct dvb_frontend_parameters *p)
 {
 	struct au8522_state* state = fe->demodulator_priv;

 	p->frequency = state->current_frequency;
 	p->u.vsb.modulation = state->current_modulation;

 	return 0;
 }

 static int au8522_get_tune_settings(struct dvb_frontend* fe,
 				     struct dvb_frontend_tune_settings *tune)
 {
 	tune->min_delay_ms = 1000;
 	return 0;
 }

 static void au8522_release(struct dvb_frontend* fe)
 {
 	struct au8522_state* state = fe->demodulator_priv;
 	kfree(state);
 }

 static struct dvb_frontend_ops au8522_ops;

 struct dvb_frontend* au8522_attach(const struct au8522_config* config,
 				    struct i2c_adapter* i2c)
 {
 	struct au8522_state* state = NULL;

 	/* allocate memory for the internal state */
 	state = kmalloc(sizeof(struct au8522_state), GFP_KERNEL);
 	if (state == NULL)
 		goto error;

 	/* setup the state */
 	state->config = config;
 	state->i2c = i2c;
 	/* create dvb_frontend */
 	memcpy(&state->frontend.ops, &au8522_ops,
 	       sizeof(struct dvb_frontend_ops));
 	state->frontend.demodulator_priv = state;

 	if (au8522_init(&state->frontend) != 0) {
 		printk(KERN_ERR "%s: Failed to initialize correctly\n",
 			__FUNCTION__);
 		goto error;
 	}

 	/* Note: Leaving the I2C gate open here. */
 	au8522_i2c_gate_ctrl(&state->frontend, 1);

 	return &state->frontend;

 error:
 	kfree(state);
 	return NULL;
 }

 static struct dvb_frontend_ops au8522_ops = {

 	.info = {
 		.name			= "Auvitek AU8522 QAM/8VSB Frontend",
 		.type			= FE_ATSC,
 		.frequency_min		= 54000000,
 		.frequency_max		= 858000000,
 		.frequency_stepsize	= 62500,
 		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 	},

 	.init                 = au8522_init,
 	.i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
 	.set_frontend         = au8522_set_frontend,
 	.get_frontend         = au8522_get_frontend,
 	.get_tune_settings    = au8522_get_tune_settings,
 	.read_status          = au8522_read_status,
 	.read_ber             = au8522_read_ber,
 	.read_signal_strength = au8522_read_signal_strength,
 	.read_snr             = au8522_read_snr,
 	.read_ucblocks        = au8522_read_ucblocks,
 	.release              = au8522_release,
 };

 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Enable verbose debug messages");

 MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
 MODULE_AUTHOR("Steven Toth");
 MODULE_LICENSE("GPL");

 EXPORT_SYMBOL(au8522_attach);

 /*
  * Local variables:
  * c-basic-offset: 8
  */
	/*
	Auvitek AU8522 QAM/8VSB demodulator driver

	Copyright (C) 2008 Steven Toth <stoth@hauppauge.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.

	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/string.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include "dvb_frontend.h"
	#include "dvb-pll.h"
	#include "au8522.h"

	struct au8522_state {

	struct i2c_adapter* i2c;

	/* configuration settings */
	const struct au8522_config* config;

	struct dvb_frontend frontend;

	u32 current_frequency;
	fe_modulation_t current_modulation;

	};

	static int debug = 0;
	#define dprintk if (debug) printk

	/* 16 bit registers, 8 bit values */
	static int au8522_writereg(struct au8522_state* state, u16 reg, u8 data)
	{
	int ret;
	u8 buf [] = { reg >> 8, reg & 0xff, data };

	struct i2c_msg msg = { .addr = state->config->demod_address,
	.flags = 0, .buf = buf, .len = 3 };

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

	if (ret != 1)
	printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
	"ret == %i)\n", __FUNCTION__, reg, data, ret);

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

	static u8 au8522_readreg(struct au8522_state* state, u16 reg)
	{
	int ret;
	u8 b0 [] = { reg >> 8, reg & 0xff };
	u8 b1 [] = { 0 };

	struct i2c_msg msg [] = {
	{ .addr = state->config->demod_address, .flags = 0,
	.buf = b0, .len = 2 },
	{ .addr = state->config->demod_address, .flags = I2C_M_RD,
	.buf = b1, .len = 1 } };

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

	if (ret != 2)
	printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
	return b1[0];
	}

	static int au8522_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
	{
	struct au8522_state* state = fe->demodulator_priv;

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

	if (enable)
	return au8522_writereg(state, 0x106, 1);
	else
	return au8522_writereg(state, 0x106, 0);
	}

	static int au8522_enable_modulation(struct dvb_frontend* fe,
	fe_modulation_t m)
	{
	struct au8522_state* state = fe->demodulator_priv;

	dprintk("%s(0x%08x)\n", __FUNCTION__, m);

	switch(m) {
	case VSB_8:
	dprintk("%s() VSB_8\n", __FUNCTION__);

	//au8522_writereg(state, 0x410b, 0x84); // Serial

	//au8522_writereg(state, 0x8090, 0x82);
	au8522_writereg(state, 0x8090, 0x84);
	au8522_writereg(state, 0x4092, 0x11);
	au8522_writereg(state, 0x2005, 0x00);
	au8522_writereg(state, 0x8091, 0x80);

	au8522_writereg(state, 0x80a3, 0x0c);
	au8522_writereg(state, 0x80a4, 0xe8);
	au8522_writereg(state, 0x8081, 0xc4);
	au8522_writereg(state, 0x80a5, 0x40);
	au8522_writereg(state, 0x80a7, 0x40);
	au8522_writereg(state, 0x80a6, 0x67);
	au8522_writereg(state, 0x8262, 0x20);
	au8522_writereg(state, 0x821c, 0x30);
	au8522_writereg(state, 0x80d8, 0x1a);
	au8522_writereg(state, 0x8227, 0xa0);
	au8522_writereg(state, 0x8121, 0xff);
	au8522_writereg(state, 0x80a8, 0xf0);
	au8522_writereg(state, 0x80a9, 0x05);
	au8522_writereg(state, 0x80aa, 0x77);
	au8522_writereg(state, 0x80ab, 0xf0);
	au8522_writereg(state, 0x80ac, 0x05);
	au8522_writereg(state, 0x80ad, 0x77);
	au8522_writereg(state, 0x80ae, 0x41);
	au8522_writereg(state, 0x80af, 0x66);
	au8522_writereg(state, 0x821b, 0xcc);
	au8522_writereg(state, 0x821d, 0x80);
	au8522_writereg(state, 0x80b5, 0xfb);
	au8522_writereg(state, 0x80b6, 0x8e);
	au8522_writereg(state, 0x80b7, 0x39);
	au8522_writereg(state, 0x80a4, 0xe8);
	au8522_writereg(state, 0x8231, 0x13);
	break;
	case QAM_64:
	case QAM_256:
	au8522_writereg(state, 0x80a3, 0x09);
	au8522_writereg(state, 0x80a4, 0x00);
	au8522_writereg(state, 0x8081, 0xc4);
	au8522_writereg(state, 0x80a5, 0x40);
	au8522_writereg(state, 0x80b5, 0xfb);
	au8522_writereg(state, 0x80b6, 0x8e);
	au8522_writereg(state, 0x80b7, 0x39);
	au8522_writereg(state, 0x80aa, 0x77);
	au8522_writereg(state, 0x80ad, 0x77);
	au8522_writereg(state, 0x80a6, 0x67);
	au8522_writereg(state, 0x8262, 0x20);
	au8522_writereg(state, 0x821c, 0x30);
	au8522_writereg(state, 0x80b8, 0x3e);
	au8522_writereg(state, 0x80b9, 0xf0);
	au8522_writereg(state, 0x80ba, 0x01);
	au8522_writereg(state, 0x80bb, 0x18);
	au8522_writereg(state, 0x80bc, 0x50);
	au8522_writereg(state, 0x80bd, 0x00);
	au8522_writereg(state, 0x80be, 0xea);
	au8522_writereg(state, 0x80bf, 0xef);
	au8522_writereg(state, 0x80c0, 0xfc);
	au8522_writereg(state, 0x80c1, 0xbd);
	au8522_writereg(state, 0x80c2, 0x1f);
	au8522_writereg(state, 0x80c3, 0xfc);
	au8522_writereg(state, 0x80c4, 0xdd);
	au8522_writereg(state, 0x80c5, 0xaf);
	au8522_writereg(state, 0x80c6, 0x00);
	au8522_writereg(state, 0x80c7, 0x38);
	au8522_writereg(state, 0x80c8, 0x30);
	au8522_writereg(state, 0x80c9, 0x05);
	au8522_writereg(state, 0x80ca, 0x4a);
	au8522_writereg(state, 0x80cb, 0xd0);
	au8522_writereg(state, 0x80cc, 0x01);
	au8522_writereg(state, 0x80cd, 0xd9);
	au8522_writereg(state, 0x80ce, 0x6f);
	au8522_writereg(state, 0x80cf, 0xf9);
	au8522_writereg(state, 0x80d0, 0x70);
	au8522_writereg(state, 0x80d1, 0xdf);
	au8522_writereg(state, 0x80d2, 0xf7);
	au8522_writereg(state, 0x80d3, 0xc2);
	au8522_writereg(state, 0x80d4, 0xdf);
	au8522_writereg(state, 0x80d5, 0x02);
	au8522_writereg(state, 0x80d6, 0x9a);
	au8522_writereg(state, 0x80d7, 0xd0);
	au8522_writereg(state, 0x8250, 0x0d);
	au8522_writereg(state, 0x8251, 0xcd);
	au8522_writereg(state, 0x8252, 0xe0);
	au8522_writereg(state, 0x8253, 0x05);
	au8522_writereg(state, 0x8254, 0xa7);
	au8522_writereg(state, 0x8255, 0xff);
	au8522_writereg(state, 0x8256, 0xed);
	au8522_writereg(state, 0x8257, 0x5b);
	au8522_writereg(state, 0x8258, 0xae);
	au8522_writereg(state, 0x8259, 0xe6);
	au8522_writereg(state, 0x825a, 0x3d);
	au8522_writereg(state, 0x825b, 0x0f);
	au8522_writereg(state, 0x825c, 0x0d);
	au8522_writereg(state, 0x825d, 0xea);
	au8522_writereg(state, 0x825e, 0xf2);
	au8522_writereg(state, 0x825f, 0x51);
	au8522_writereg(state, 0x8260, 0xf5);
	au8522_writereg(state, 0x8261, 0x06);
	au8522_writereg(state, 0x821a, 0x00);
	au8522_writereg(state, 0x8546, 0x40);
	au8522_writereg(state, 0x8210, 0x26);
	au8522_writereg(state, 0x8211, 0xf6);
	au8522_writereg(state, 0x8212, 0x84);
	au8522_writereg(state, 0x8213, 0x02);
	au8522_writereg(state, 0x8502, 0x01);
	au8522_writereg(state, 0x8121, 0x04);
	au8522_writereg(state, 0x8122, 0x04);
	au8522_writereg(state, 0x852e, 0x10);
	au8522_writereg(state, 0x80a4, 0xca);
	au8522_writereg(state, 0x80a7, 0x40);
	au8522_writereg(state, 0x8526, 0x01);
	break;
	default:
	dprintk("%s() Invalid modulation\n", __FUNCTION__);
	return -EINVAL;
	}

	state->current_modulation = m;

	return 0;
	}

	/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
	static int au8522_set_frontend (struct dvb_frontend* fe,
	struct dvb_frontend_parameters *p)
	{
	struct au8522_state* state = fe->demodulator_priv;

	dprintk("%s(frequency=%d)\n", __FUNCTION__, p->frequency);

	state->current_frequency = p->frequency;

	au8522_enable_modulation(fe, p->u.vsb.modulation);

	/* Allow the demod to settle */
	msleep(100);

	if (fe->ops.tuner_ops.set_params) {
	if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1);
	fe->ops.tuner_ops.set_params(fe, p);
	if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
	}

	return 0;
	}

	/* Reset the demod hardware and reset all of the configuration registers
	to a default state. */
	static int au8522_init(struct dvb_frontend* fe)
	{
	struct au8522_state* state = fe->demodulator_priv;
	dprintk("%s()\n", __FUNCTION__);

	au8522_writereg(state, 0xa4, 1 << 5);

	au8522_i2c_gate_ctrl(fe, 1);

	return 0;
	}

	static int au8522_read_status(struct dvb_frontend* fe, fe_status_t* status)
	{
	struct au8522_state* state = fe->demodulator_priv;
	u8 reg;
	u32 tuner_status = 0;

	*status = 0;

	if (state->current_modulation == VSB_8) {
	dprintk("%s() Checking VSB_8\n", __FUNCTION__);
	//au8522_writereg(state, 0x80a4, 0x20);
	reg = au8522_readreg(state, 0x4088);
	if(reg & 0x01)
	*status \|= FE_HAS_VITERBI;
	if(reg & 0x02)
	*status \|= FE_HAS_LOCK \| FE_HAS_SYNC;
	} else {
	dprintk("%s() Checking QAM\n", __FUNCTION__);
	reg = au8522_readreg(state, 0x4541);
	if(reg & 0x80)
	*status \|= FE_HAS_VITERBI;
	if(reg & 0x20)
	*status \|= FE_HAS_LOCK \| FE_HAS_SYNC;
	}

	switch(state->config->status_mode) {
	case AU8522_DEMODLOCKING:
	dprintk("%s() DEMODLOCKING\n", __FUNCTION__);
	if (*status & FE_HAS_VITERBI)
	*status \|= FE_HAS_CARRIER \| FE_HAS_SIGNAL;
	break;
	case AU8522_TUNERLOCKING:
	/* Get the tuner status */
	dprintk("%s() TUNERLOCKING\n", __FUNCTION__);
	if (fe->ops.tuner_ops.get_status) {
	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 1);

	fe->ops.tuner_ops.get_status(fe, &tuner_status);

	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 0);
	}
	if (tuner_status)
	*status \|= FE_HAS_CARRIER \| FE_HAS_SIGNAL;
	break;
	}

	dprintk("%s() status 0x%08x\n", __FUNCTION__, *status);

	return 0;
	}

	static int au8522_read_snr(struct dvb_frontend* fe, u16* snr)
	{
	dprintk("%s()\n", __FUNCTION__);

	*snr = 0;

	return 0;
	}

	static int au8522_read_signal_strength(struct dvb_frontend* fe,
	u16* signal_strength)
	{
	return au8522_read_snr(fe, signal_strength);
	}

	static int au8522_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
	{
	struct au8522_state* state = fe->demodulator_priv;

	*ucblocks = au8522_readreg(state, 0x4087);

	return 0;
	}

	static int au8522_read_ber(struct dvb_frontend* fe, u32* ber)
	{
	return au8522_read_ucblocks(fe, ber);
	}

	static int au8522_get_frontend(struct dvb_frontend* fe,
	struct dvb_frontend_parameters *p)
	{
	struct au8522_state* state = fe->demodulator_priv;

	p->frequency = state->current_frequency;
	p->u.vsb.modulation = state->current_modulation;

	return 0;
	}

	static int au8522_get_tune_settings(struct dvb_frontend* fe,
	struct dvb_frontend_tune_settings *tune)
	{
	tune->min_delay_ms = 1000;
	return 0;
	}

	static void au8522_release(struct dvb_frontend* fe)
	{
	struct au8522_state* state = fe->demodulator_priv;
	kfree(state);
	}

	static struct dvb_frontend_ops au8522_ops;

	struct dvb_frontend* au8522_attach(const struct au8522_config* config,
	struct i2c_adapter* i2c)
	{
	struct au8522_state* state = NULL;

	/* allocate memory for the internal state */
	state = kmalloc(sizeof(struct au8522_state), GFP_KERNEL);
	if (state == NULL)
	goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;
	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &au8522_ops,
	sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;

	if (au8522_init(&state->frontend) != 0) {
	printk(KERN_ERR "%s: Failed to initialize correctly\n",
	__FUNCTION__);
	goto error;
	}

	/* Note: Leaving the I2C gate open here. */
	au8522_i2c_gate_ctrl(&state->frontend, 1);

	return &state->frontend;

	error:
	kfree(state);
	return NULL;
	}

	static struct dvb_frontend_ops au8522_ops = {

	.info = {
	.name = "Auvitek AU8522 QAM/8VSB Frontend",
	.type = FE_ATSC,
	.frequency_min = 54000000,
	.frequency_max = 858000000,
	.frequency_stepsize = 62500,
	.caps = FE_CAN_QAM_64 \| FE_CAN_QAM_256 \| FE_CAN_8VSB
	},

	.init = au8522_init,
	.i2c_gate_ctrl = au8522_i2c_gate_ctrl,
	.set_frontend = au8522_set_frontend,
	.get_frontend = au8522_get_frontend,
	.get_tune_settings = au8522_get_tune_settings,
	.read_status = au8522_read_status,
	.read_ber = au8522_read_ber,
	.read_signal_strength = au8522_read_signal_strength,
	.read_snr = au8522_read_snr,
	.read_ucblocks = au8522_read_ucblocks,
	.release = au8522_release,
	};

	module_param(debug, int, 0644);
	MODULE_PARM_DESC(debug, "Enable verbose debug messages");

	MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
	MODULE_AUTHOR("Steven Toth");
	MODULE_LICENSE("GPL");

	EXPORT_SYMBOL(au8522_attach);

	/*
	* Local variables:
	* c-basic-offset: 8
	*/