drivers/media/dvb-frontends/or51211.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *    Support for OR51211 (pcHDTV HD-2000) - VSB
  *
  *    Copyright (C) 2005 Kirk Lapray <kirk_lapray@bigfoot.com>
  *
  *    Based on code from Jack Kelliher (kelliher@xmission.com)
  *                           Copyright (C) 2002 & pcHDTV, inc.
 */

 #define pr_fmt(fmt)	KBUILD_MODNAME ": %s: " fmt, __func__

 /*
  * This driver needs external firmware. Please use the command
  * "<kerneldir>/scripts/get_dvb_firmware or51211" to
  * download/extract it, and then copy it to /usr/lib/hotplug/firmware
  * or /lib/firmware (depending on configuration of firmware hotplug).
  */
 #define OR51211_DEFAULT_FIRMWARE "dvb-fe-or51211.fw"

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/firmware.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <asm/byteorder.h>

 #include <media/dvb_math.h>
 #include <media/dvb_frontend.h>
 #include "or51211.h"

 static int debug;
 #define dprintk(args...) \
 	do { if (debug) pr_debug(args); } while (0)

 static u8 run_buf[] = {0x7f,0x01};
 static u8 cmd_buf[] = {0x04,0x01,0x50,0x80,0x06}; // ATSC

 struct or51211_state {

 	struct i2c_adapter* i2c;

 	/* Configuration settings */
 	const struct or51211_config* config;

 	struct dvb_frontend frontend;
 	struct bt878* bt;

 	/* Demodulator private data */
 	u8 initialized:1;
 	u32 snr; /* Result of last SNR calculation */

 	/* Tuner private data */
 	u32 current_frequency;
 };

 static int i2c_writebytes (struct or51211_state* state, u8 reg, const u8 *buf,
 			   int len)
 {
 	int err;
 	struct i2c_msg msg;
 	msg.addr	= reg;
 	msg.flags	= 0;
 	msg.len		= len;
 	msg.buf		= (u8 *)buf;

 	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
 		pr_warn("error (addr %02x, err == %i)\n", reg, err);
 		return -EREMOTEIO;
 	}

 	return 0;
 }

 static int i2c_readbytes(struct or51211_state *state, u8 reg, u8 *buf, int len)
 {
 	int err;
 	struct i2c_msg msg;
 	msg.addr	= reg;
 	msg.flags	= I2C_M_RD;
 	msg.len		= len;
 	msg.buf		= buf;

 	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
 		pr_warn("error (addr %02x, err == %i)\n", reg, err);
 		return -EREMOTEIO;
 	}

 	return 0;
 }

 static int or51211_load_firmware (struct dvb_frontend* fe,
 				  const struct firmware *fw)
 {
 	struct or51211_state* state = fe->demodulator_priv;
 	u8 tudata[585];
 	int i;

 	dprintk("Firmware is %zu bytes\n", fw->size);

 	/* Get eprom data */
 	tudata[0] = 17;
 	if (i2c_writebytes(state,0x50,tudata,1)) {
 		pr_warn("error eprom addr\n");
 		return -1;
 	}
 	if (i2c_readbytes(state,0x50,&tudata[145],192)) {
 		pr_warn("error eprom\n");
 		return -1;
 	}

 	/* Create firmware buffer */
 	for (i = 0; i < 145; i++)
 		tudata[i] = fw->data[i];

 	for (i = 0; i < 248; i++)
 		tudata[i+337] = fw->data[145+i];

 	state->config->reset(fe);

 	if (i2c_writebytes(state,state->config->demod_address,tudata,585)) {
 		pr_warn("error 1\n");
 		return -1;
 	}
 	msleep(1);

 	if (i2c_writebytes(state,state->config->demod_address,
 			   &fw->data[393],8125)) {
 		pr_warn("error 2\n");
 		return -1;
 	}
 	msleep(1);

 	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
 		pr_warn("error 3\n");
 		return -1;
 	}

 	/* Wait at least 5 msec */
 	msleep(10);
 	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
 		pr_warn("error 4\n");
 		return -1;
 	}
 	msleep(10);

 	pr_info("Done.\n");
 	return 0;
 };

 static int or51211_setmode(struct dvb_frontend* fe, int mode)
 {
 	struct or51211_state* state = fe->demodulator_priv;
 	u8 rec_buf[14];

 	state->config->setmode(fe, mode);

 	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
 		pr_warn("error 1\n");
 		return -1;
 	}

 	/* Wait at least 5 msec */
 	msleep(10);
 	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
 		pr_warn("error 2\n");
 		return -1;
 	}

 	msleep(10);

 	/* Set operation mode in Receiver 1 register;
 	 * type 1:
 	 * data 0x50h  Automatic sets receiver channel conditions
 	 *             Automatic NTSC rejection filter
 	 *             Enable  MPEG serial data output
 	 *             MPEG2tr
 	 *             High tuner phase noise
 	 *             normal +/-150kHz Carrier acquisition range
 	 */
 	if (i2c_writebytes(state,state->config->demod_address,cmd_buf,3)) {
 		pr_warn("error 3\n");
 		return -1;
 	}

 	rec_buf[0] = 0x04;
 	rec_buf[1] = 0x00;
 	rec_buf[2] = 0x03;
 	rec_buf[3] = 0x00;
 	msleep(20);
 	if (i2c_writebytes(state,state->config->demod_address,rec_buf,3)) {
 		pr_warn("error 5\n");
 	}
 	msleep(3);
 	if (i2c_readbytes(state,state->config->demod_address,&rec_buf[10],2)) {
 		pr_warn("error 6\n");
 		return -1;
 	}
 	dprintk("rec status %02x %02x\n", rec_buf[10], rec_buf[11]);

 	return 0;
 }

 static int or51211_set_parameters(struct dvb_frontend *fe)
 {
 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 	struct or51211_state* state = fe->demodulator_priv;

 	/* Change only if we are actually changing the channel */
 	if (state->current_frequency != p->frequency) {
 		if (fe->ops.tuner_ops.set_params) {
 			fe->ops.tuner_ops.set_params(fe);
 			if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 		}

 		/* Set to ATSC mode */
 		or51211_setmode(fe,0);

 		/* Update current frequency */
 		state->current_frequency = p->frequency;
 	}
 	return 0;
 }

 static int or51211_read_status(struct dvb_frontend *fe, enum fe_status *status)
 {
 	struct or51211_state* state = fe->demodulator_priv;
 	unsigned char rec_buf[2];
 	unsigned char snd_buf[] = {0x04,0x00,0x03,0x00};
 	*status = 0;

 	/* Receiver Status */
 	if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
 		pr_warn("write error\n");
 		return -1;
 	}
 	msleep(3);
 	if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
 		pr_warn("read error\n");
 		return -1;
 	}
 	dprintk("%x %x\n", rec_buf[0], rec_buf[1]);

 	if (rec_buf[0] &  0x01) { /* Receiver Lock */
 		*status |= FE_HAS_SIGNAL;
 		*status |= FE_HAS_CARRIER;
 		*status |= FE_HAS_VITERBI;
 		*status |= FE_HAS_SYNC;
 		*status |= FE_HAS_LOCK;
 	}
 	return 0;
 }

 /* Calculate SNR estimation (scaled by 2^24)

    8-VSB SNR equation from Oren datasheets

    For 8-VSB:
      SNR[dB] = 10 * log10(219037.9454 / MSE^2 )

    We re-write the snr equation as:
      SNR * 2^24 = 10*(c - 2*intlog10(MSE))
    Where for 8-VSB, c = log10(219037.9454) * 2^24 */

 static u32 calculate_snr(u32 mse, u32 c)
 {
 	if (mse == 0) /* No signal */
 		return 0;

 	mse = 2*intlog10(mse);
 	if (mse > c) {
 		/* Negative SNR, which is possible, but realisticly the
 		demod will lose lock before the signal gets this bad.  The
 		API only allows for unsigned values, so just return 0 */
 		return 0;
 	}
 	return 10*(c - mse);
 }

 static int or51211_read_snr(struct dvb_frontend* fe, u16* snr)
 {
 	struct or51211_state* state = fe->demodulator_priv;
 	u8 rec_buf[2];
 	u8 snd_buf[3];

 	/* SNR after Equalizer */
 	snd_buf[0] = 0x04;
 	snd_buf[1] = 0x00;
 	snd_buf[2] = 0x04;

 	if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
 		pr_warn("error writing snr reg\n");
 		return -1;
 	}
 	if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
 		pr_warn("read_status read error\n");
 		return -1;
 	}

 	state->snr = calculate_snr(rec_buf[0], 89599047);
 	*snr = (state->snr) >> 16;

 	dprintk("noise = 0x%02x, snr = %d.%02d dB\n", rec_buf[0],
 		state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);

 	return 0;
 }

 static int or51211_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 {
 	/* Calculate Strength from SNR up to 35dB */
 	/* Even though the SNR can go higher than 35dB, there is some comfort */
 	/* factor in having a range of strong signals that can show at 100%   */
 	struct or51211_state* state = (struct or51211_state*)fe->demodulator_priv;
 	u16 snr;
 	int ret;

 	ret = fe->ops.read_snr(fe, &snr);
 	if (ret != 0)
 		return ret;
 	/* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
 	/* scale the range 0 - 35*2^24 into 0 - 65535 */
 	if (state->snr >= 8960 * 0x10000)
 		*strength = 0xffff;
 	else
 		*strength = state->snr / 8960;

 	return 0;
 }

 static int or51211_read_ber(struct dvb_frontend* fe, u32* ber)
 {
 	*ber = -ENOSYS;
 	return 0;
 }

 static int or51211_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 {
 	*ucblocks = -ENOSYS;
 	return 0;
 }

 static int or51211_sleep(struct dvb_frontend* fe)
 {
 	return 0;
 }

 static int or51211_init(struct dvb_frontend* fe)
 {
 	struct or51211_state* state = fe->demodulator_priv;
 	const struct or51211_config* config = state->config;
 	const struct firmware* fw;
 	unsigned char get_ver_buf[] = {0x04,0x00,0x30,0x00,0x00};
 	unsigned char rec_buf[14];
 	int ret,i;

 	if (!state->initialized) {
 		/* Request the firmware, this will block until it uploads */
 		pr_info("Waiting for firmware upload (%s)...\n",
 			OR51211_DEFAULT_FIRMWARE);
 		ret = config->request_firmware(fe, &fw,
 					       OR51211_DEFAULT_FIRMWARE);
 		pr_info("Got Hotplug firmware\n");
 		if (ret) {
 			pr_warn("No firmware uploaded (timeout or file not found?)\n");
 			return ret;
 		}

 		ret = or51211_load_firmware(fe, fw);
 		release_firmware(fw);
 		if (ret) {
 			pr_warn("Writing firmware to device failed!\n");
 			return ret;
 		}
 		pr_info("Firmware upload complete.\n");

 		/* Set operation mode in Receiver 1 register;
 		 * type 1:
 		 * data 0x50h  Automatic sets receiver channel conditions
 		 *             Automatic NTSC rejection filter
 		 *             Enable  MPEG serial data output
 		 *             MPEG2tr
 		 *             High tuner phase noise
 		 *             normal +/-150kHz Carrier acquisition range
 		 */
 		if (i2c_writebytes(state,state->config->demod_address,
 				   cmd_buf,3)) {
 			pr_warn("Load DVR Error 5\n");
 			return -1;
 		}

 		/* Read back ucode version to besure we loaded correctly */
 		/* and are really up and running */
 		rec_buf[0] = 0x04;
 		rec_buf[1] = 0x00;
 		rec_buf[2] = 0x03;
 		rec_buf[3] = 0x00;
 		msleep(30);
 		if (i2c_writebytes(state,state->config->demod_address,
 				   rec_buf,3)) {
 			pr_warn("Load DVR Error A\n");
 			return -1;
 		}
 		msleep(3);
 		if (i2c_readbytes(state,state->config->demod_address,
 				  &rec_buf[10],2)) {
 			pr_warn("Load DVR Error B\n");
 			return -1;
 		}

 		rec_buf[0] = 0x04;
 		rec_buf[1] = 0x00;
 		rec_buf[2] = 0x01;
 		rec_buf[3] = 0x00;
 		msleep(20);
 		if (i2c_writebytes(state,state->config->demod_address,
 				   rec_buf,3)) {
 			pr_warn("Load DVR Error C\n");
 			return -1;
 		}
 		msleep(3);
 		if (i2c_readbytes(state,state->config->demod_address,
 				  &rec_buf[12],2)) {
 			pr_warn("Load DVR Error D\n");
 			return -1;
 		}

 		for (i = 0; i < 8; i++)
 			rec_buf[i]=0xed;

 		for (i = 0; i < 5; i++) {
 			msleep(30);
 			get_ver_buf[4] = i+1;
 			if (i2c_writebytes(state,state->config->demod_address,
 					   get_ver_buf,5)) {
 				pr_warn("Load DVR Error 6 - %d\n", i);
 				return -1;
 			}
 			msleep(3);

 			if (i2c_readbytes(state,state->config->demod_address,
 					  &rec_buf[i*2],2)) {
 				pr_warn("Load DVR Error 7 - %d\n", i);
 				return -1;
 			}
 			/* If we didn't receive the right index, try again */
 			if ((int)rec_buf[i*2+1]!=i+1){
 			  i--;
 			}
 		}
 		dprintk("read_fwbits %10ph\n", rec_buf);

 		pr_info("ver TU%02x%02x%02x VSB mode %02x Status %02x\n",
 			rec_buf[2], rec_buf[4], rec_buf[6], rec_buf[12],
 			rec_buf[10]);

 		rec_buf[0] = 0x04;
 		rec_buf[1] = 0x00;
 		rec_buf[2] = 0x03;
 		rec_buf[3] = 0x00;
 		msleep(20);
 		if (i2c_writebytes(state,state->config->demod_address,
 				   rec_buf,3)) {
 			pr_warn("Load DVR Error 8\n");
 			return -1;
 		}
 		msleep(20);
 		if (i2c_readbytes(state,state->config->demod_address,
 				  &rec_buf[8],2)) {
 			pr_warn("Load DVR Error 9\n");
 			return -1;
 		}
 		state->initialized = 1;
 	}

 	return 0;
 }

 static int or51211_get_tune_settings(struct dvb_frontend* fe,
 				     struct dvb_frontend_tune_settings* fesettings)
 {
 	fesettings->min_delay_ms = 500;
 	fesettings->step_size = 0;
 	fesettings->max_drift = 0;
 	return 0;
 }

 static void or51211_release(struct dvb_frontend* fe)
 {
 	struct or51211_state* state = fe->demodulator_priv;
 	state->config->sleep(fe);
 	kfree(state);
 }

 static const struct dvb_frontend_ops or51211_ops;

 struct dvb_frontend* or51211_attach(const struct or51211_config* config,
 				    struct i2c_adapter* i2c)
 {
 	struct or51211_state* state = NULL;

 	/* Allocate memory for the internal state */
 	state = kzalloc(sizeof(struct or51211_state), GFP_KERNEL);
 	if (state == NULL)
 		return NULL;

 	/* Setup the state */
 	state->config = config;
 	state->i2c = i2c;
 	state->initialized = 0;
 	state->current_frequency = 0;

 	/* Create dvb_frontend */
 	memcpy(&state->frontend.ops, &or51211_ops, sizeof(struct dvb_frontend_ops));
 	state->frontend.demodulator_priv = state;
 	return &state->frontend;
 }

 static const struct dvb_frontend_ops or51211_ops = {
 	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
 	.info = {
 		.name                  = "Oren OR51211 VSB Frontend",
 		.frequency_min_hz      =  44 * MHz,
 		.frequency_max_hz      = 958 * MHz,
 		.frequency_stepsize_hz = 166666,
 		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 			FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 			FE_CAN_8VSB
 	},

 	.release = or51211_release,

 	.init = or51211_init,
 	.sleep = or51211_sleep,

 	.set_frontend = or51211_set_parameters,
 	.get_tune_settings = or51211_get_tune_settings,

 	.read_status = or51211_read_status,
 	.read_ber = or51211_read_ber,
 	.read_signal_strength = or51211_read_signal_strength,
 	.read_snr = or51211_read_snr,
 	.read_ucblocks = or51211_read_ucblocks,
 };

 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

 MODULE_DESCRIPTION("Oren OR51211 VSB [pcHDTV HD-2000] Demodulator Driver");
 MODULE_AUTHOR("Kirk Lapray");
 MODULE_LICENSE("GPL");

 EXPORT_SYMBOL_GPL(or51211_attach);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Support for OR51211 (pcHDTV HD-2000) - VSB
	*
	* Copyright (C) 2005 Kirk Lapray <kirk_lapray@bigfoot.com>
	*
	* Based on code from Jack Kelliher (kelliher@xmission.com)
	* Copyright (C) 2002 & pcHDTV, inc.
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__

	/*
	* This driver needs external firmware. Please use the command
	* "<kerneldir>/scripts/get_dvb_firmware or51211" to
	* download/extract it, and then copy it to /usr/lib/hotplug/firmware
	* or /lib/firmware (depending on configuration of firmware hotplug).
	*/
	#define OR51211_DEFAULT_FIRMWARE "dvb-fe-or51211.fw"

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/device.h>
	#include <linux/firmware.h>
	#include <linux/string.h>
	#include <linux/slab.h>
	#include <asm/byteorder.h>

	#include <media/dvb_math.h>
	#include <media/dvb_frontend.h>
	#include "or51211.h"

	static int debug;
	#define dprintk(args...) \
	do { if (debug) pr_debug(args); } while (0)

	static u8 run_buf[] = {0x7f,0x01};
	static u8 cmd_buf[] = {0x04,0x01,0x50,0x80,0x06}; // ATSC

	struct or51211_state {

	struct i2c_adapter* i2c;

	/* Configuration settings */
	const struct or51211_config* config;

	struct dvb_frontend frontend;
	struct bt878* bt;

	/* Demodulator private data */
	u8 initialized:1;
	u32 snr; /* Result of last SNR calculation */

	/* Tuner private data */
	u32 current_frequency;
	};

	static int i2c_writebytes (struct or51211_state* state, u8 reg, const u8 *buf,
	int len)
	{
	int err;
	struct i2c_msg msg;
	msg.addr = reg;
	msg.flags = 0;
	msg.len = len;
	msg.buf = (u8 *)buf;

	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
	pr_warn("error (addr %02x, err == %i)\n", reg, err);
	return -EREMOTEIO;
	}

	return 0;
	}

	static int i2c_readbytes(struct or51211_state state, u8 reg, u8 buf, int len)
	{
	int err;
	struct i2c_msg msg;
	msg.addr = reg;
	msg.flags = I2C_M_RD;
	msg.len = len;
	msg.buf = buf;

	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
	pr_warn("error (addr %02x, err == %i)\n", reg, err);
	return -EREMOTEIO;
	}

	return 0;
	}

	static int or51211_load_firmware (struct dvb_frontend* fe,
	const struct firmware *fw)
	{
	struct or51211_state* state = fe->demodulator_priv;
	u8 tudata[585];
	int i;

	dprintk("Firmware is %zu bytes\n", fw->size);

	/* Get eprom data */
	tudata[0] = 17;
	if (i2c_writebytes(state,0x50,tudata,1)) {
	pr_warn("error eprom addr\n");
	return -1;
	}
	if (i2c_readbytes(state,0x50,&tudata[145],192)) {
	pr_warn("error eprom\n");
	return -1;
	}

	/* Create firmware buffer */
	for (i = 0; i < 145; i++)
	tudata[i] = fw->data[i];

	for (i = 0; i < 248; i++)
	tudata[i+337] = fw->data[145+i];

	state->config->reset(fe);

	if (i2c_writebytes(state,state->config->demod_address,tudata,585)) {
	pr_warn("error 1\n");
	return -1;
	}
	msleep(1);

	if (i2c_writebytes(state,state->config->demod_address,
	&fw->data[393],8125)) {
	pr_warn("error 2\n");
	return -1;
	}
	msleep(1);

	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
	pr_warn("error 3\n");
	return -1;
	}

	/* Wait at least 5 msec */
	msleep(10);
	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
	pr_warn("error 4\n");
	return -1;
	}
	msleep(10);

	pr_info("Done.\n");
	return 0;
	};

	static int or51211_setmode(struct dvb_frontend* fe, int mode)
	{
	struct or51211_state* state = fe->demodulator_priv;
	u8 rec_buf[14];

	state->config->setmode(fe, mode);

	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
	pr_warn("error 1\n");
	return -1;
	}

	/* Wait at least 5 msec */
	msleep(10);
	if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
	pr_warn("error 2\n");
	return -1;
	}

	msleep(10);

	/* Set operation mode in Receiver 1 register;
	* type 1:
	* data 0x50h Automatic sets receiver channel conditions
	* Automatic NTSC rejection filter
	* Enable MPEG serial data output
	* MPEG2tr
	* High tuner phase noise
	* normal +/-150kHz Carrier acquisition range
	*/
	if (i2c_writebytes(state,state->config->demod_address,cmd_buf,3)) {
	pr_warn("error 3\n");
	return -1;
	}

	rec_buf[0] = 0x04;
	rec_buf[1] = 0x00;
	rec_buf[2] = 0x03;
	rec_buf[3] = 0x00;
	msleep(20);
	if (i2c_writebytes(state,state->config->demod_address,rec_buf,3)) {
	pr_warn("error 5\n");
	}
	msleep(3);
	if (i2c_readbytes(state,state->config->demod_address,&rec_buf[10],2)) {
	pr_warn("error 6\n");
	return -1;
	}
	dprintk("rec status %02x %02x\n", rec_buf[10], rec_buf[11]);

	return 0;
	}

	static int or51211_set_parameters(struct dvb_frontend *fe)
	{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct or51211_state* state = fe->demodulator_priv;

	/* Change only if we are actually changing the channel */
	if (state->current_frequency != p->frequency) {
	if (fe->ops.tuner_ops.set_params) {
	fe->ops.tuner_ops.set_params(fe);
	if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
	}

	/* Set to ATSC mode */
	or51211_setmode(fe,0);

	/* Update current frequency */
	state->current_frequency = p->frequency;
	}
	return 0;
	}

	static int or51211_read_status(struct dvb_frontend fe, enum fe_status status)
	{
	struct or51211_state* state = fe->demodulator_priv;
	unsigned char rec_buf[2];
	unsigned char snd_buf[] = {0x04,0x00,0x03,0x00};
	*status = 0;

	/* Receiver Status */
	if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
	pr_warn("write error\n");
	return -1;
	}
	msleep(3);
	if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
	pr_warn("read error\n");
	return -1;
	}
	dprintk("%x %x\n", rec_buf[0], rec_buf[1]);

	if (rec_buf[0] & 0x01) { /* Receiver Lock */
	*status \|= FE_HAS_SIGNAL;
	*status \|= FE_HAS_CARRIER;
	*status \|= FE_HAS_VITERBI;
	*status \|= FE_HAS_SYNC;
	*status \|= FE_HAS_LOCK;
	}
	return 0;
	}

	/* Calculate SNR estimation (scaled by 2^24)

	8-VSB SNR equation from Oren datasheets

	For 8-VSB:
	SNR[dB] = 10 * log10(219037.9454 / MSE^2 )

	We re-write the snr equation as:
	SNR * 2^24 = 10(c - 2intlog10(MSE))
	Where for 8-VSB, c = log10(219037.9454) * 2^24 */

	static u32 calculate_snr(u32 mse, u32 c)
	{
	if (mse == 0) /* No signal */
	return 0;

	mse = 2*intlog10(mse);
	if (mse > c) {
	/* Negative SNR, which is possible, but realisticly the
	demod will lose lock before the signal gets this bad. The
	API only allows for unsigned values, so just return 0 */
	return 0;
	}
	return 10*(c - mse);
	}

	static int or51211_read_snr(struct dvb_frontend* fe, u16* snr)
	{
	struct or51211_state* state = fe->demodulator_priv;
	u8 rec_buf[2];
	u8 snd_buf[3];

	/* SNR after Equalizer */
	snd_buf[0] = 0x04;
	snd_buf[1] = 0x00;
	snd_buf[2] = 0x04;

	if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
	pr_warn("error writing snr reg\n");
	return -1;
	}
	if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
	pr_warn("read_status read error\n");
	return -1;
	}

	state->snr = calculate_snr(rec_buf[0], 89599047);
	*snr = (state->snr) >> 16;

	dprintk("noise = 0x%02x, snr = %d.%02d dB\n", rec_buf[0],
	state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);

	return 0;
	}

	static int or51211_read_signal_strength(struct dvb_frontend* fe, u16* strength)
	{
	/* Calculate Strength from SNR up to 35dB */
	/* Even though the SNR can go higher than 35dB, there is some comfort */
	/* factor in having a range of strong signals that can show at 100% */
	struct or51211_state* state = (struct or51211_state*)fe->demodulator_priv;
	u16 snr;
	int ret;

	ret = fe->ops.read_snr(fe, &snr);
	if (ret != 0)
	return ret;
	/* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
	/* scale the range 0 - 352^24 into 0 - 65535 /
	if (state->snr >= 8960 * 0x10000)
	*strength = 0xffff;
	else
	*strength = state->snr / 8960;

	return 0;
	}

	static int or51211_read_ber(struct dvb_frontend* fe, u32* ber)
	{
	*ber = -ENOSYS;
	return 0;
	}

	static int or51211_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
	{
	*ucblocks = -ENOSYS;
	return 0;
	}

	static int or51211_sleep(struct dvb_frontend* fe)
	{
	return 0;
	}

	static int or51211_init(struct dvb_frontend* fe)
	{
	struct or51211_state* state = fe->demodulator_priv;
	const struct or51211_config* config = state->config;
	const struct firmware* fw;
	unsigned char get_ver_buf[] = {0x04,0x00,0x30,0x00,0x00};
	unsigned char rec_buf[14];
	int ret,i;

	if (!state->initialized) {
	/* Request the firmware, this will block until it uploads */
	pr_info("Waiting for firmware upload (%s)...\n",
	OR51211_DEFAULT_FIRMWARE);
	ret = config->request_firmware(fe, &fw,
	OR51211_DEFAULT_FIRMWARE);
	pr_info("Got Hotplug firmware\n");
	if (ret) {
	pr_warn("No firmware uploaded (timeout or file not found?)\n");
	return ret;
	}

	ret = or51211_load_firmware(fe, fw);
	release_firmware(fw);
	if (ret) {
	pr_warn("Writing firmware to device failed!\n");
	return ret;
	}
	pr_info("Firmware upload complete.\n");

	/* Set operation mode in Receiver 1 register;
	* type 1:
	* data 0x50h Automatic sets receiver channel conditions
	* Automatic NTSC rejection filter
	* Enable MPEG serial data output
	* MPEG2tr
	* High tuner phase noise
	* normal +/-150kHz Carrier acquisition range
	*/
	if (i2c_writebytes(state,state->config->demod_address,
	cmd_buf,3)) {
	pr_warn("Load DVR Error 5\n");
	return -1;
	}

	/* Read back ucode version to besure we loaded correctly */
	/* and are really up and running */
	rec_buf[0] = 0x04;
	rec_buf[1] = 0x00;
	rec_buf[2] = 0x03;
	rec_buf[3] = 0x00;
	msleep(30);
	if (i2c_writebytes(state,state->config->demod_address,
	rec_buf,3)) {
	pr_warn("Load DVR Error A\n");
	return -1;
	}
	msleep(3);
	if (i2c_readbytes(state,state->config->demod_address,
	&rec_buf[10],2)) {
	pr_warn("Load DVR Error B\n");
	return -1;
	}

	rec_buf[0] = 0x04;
	rec_buf[1] = 0x00;
	rec_buf[2] = 0x01;
	rec_buf[3] = 0x00;
	msleep(20);
	if (i2c_writebytes(state,state->config->demod_address,
	rec_buf,3)) {
	pr_warn("Load DVR Error C\n");
	return -1;
	}
	msleep(3);
	if (i2c_readbytes(state,state->config->demod_address,
	&rec_buf[12],2)) {
	pr_warn("Load DVR Error D\n");
	return -1;
	}

	for (i = 0; i < 8; i++)
	rec_buf[i]=0xed;

	for (i = 0; i < 5; i++) {
	msleep(30);
	get_ver_buf[4] = i+1;
	if (i2c_writebytes(state,state->config->demod_address,
	get_ver_buf,5)) {
	pr_warn("Load DVR Error 6 - %d\n", i);
	return -1;
	}
	msleep(3);

	if (i2c_readbytes(state,state->config->demod_address,
	&rec_buf[i*2],2)) {
	pr_warn("Load DVR Error 7 - %d\n", i);
	return -1;
	}
	/* If we didn't receive the right index, try again */
	if ((int)rec_buf[i*2+1]!=i+1){
	i--;
	}
	}
	dprintk("read_fwbits %10ph\n", rec_buf);

	pr_info("ver TU%02x%02x%02x VSB mode %02x Status %02x\n",
	rec_buf[2], rec_buf[4], rec_buf[6], rec_buf[12],
	rec_buf[10]);

	rec_buf[0] = 0x04;
	rec_buf[1] = 0x00;
	rec_buf[2] = 0x03;
	rec_buf[3] = 0x00;
	msleep(20);
	if (i2c_writebytes(state,state->config->demod_address,
	rec_buf,3)) {
	pr_warn("Load DVR Error 8\n");
	return -1;
	}
	msleep(20);
	if (i2c_readbytes(state,state->config->demod_address,
	&rec_buf[8],2)) {
	pr_warn("Load DVR Error 9\n");
	return -1;
	}
	state->initialized = 1;
	}

	return 0;
	}

	static int or51211_get_tune_settings(struct dvb_frontend* fe,
	struct dvb_frontend_tune_settings* fesettings)
	{
	fesettings->min_delay_ms = 500;
	fesettings->step_size = 0;
	fesettings->max_drift = 0;
	return 0;
	}

	static void or51211_release(struct dvb_frontend* fe)
	{
	struct or51211_state* state = fe->demodulator_priv;
	state->config->sleep(fe);
	kfree(state);
	}

	static const struct dvb_frontend_ops or51211_ops;

	struct dvb_frontend* or51211_attach(const struct or51211_config* config,
	struct i2c_adapter* i2c)
	{
	struct or51211_state* state = NULL;

	/* Allocate memory for the internal state */
	state = kzalloc(sizeof(struct or51211_state), GFP_KERNEL);
	if (state == NULL)
	return NULL;

	/* Setup the state */
	state->config = config;
	state->i2c = i2c;
	state->initialized = 0;
	state->current_frequency = 0;

	/* Create dvb_frontend */
	memcpy(&state->frontend.ops, &or51211_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;
	}

	static const struct dvb_frontend_ops or51211_ops = {
	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
	.info = {
	.name = "Oren OR51211 VSB Frontend",
	.frequency_min_hz = 44 * MHz,
	.frequency_max_hz = 958 * MHz,
	.frequency_stepsize_hz = 166666,
	.caps = FE_CAN_FEC_1_2 \| FE_CAN_FEC_2_3 \| FE_CAN_FEC_3_4 \|
	FE_CAN_FEC_5_6 \| FE_CAN_FEC_7_8 \| FE_CAN_FEC_AUTO \|
	FE_CAN_8VSB
	},

	.release = or51211_release,

	.init = or51211_init,
	.sleep = or51211_sleep,

	.set_frontend = or51211_set_parameters,
	.get_tune_settings = or51211_get_tune_settings,

	.read_status = or51211_read_status,
	.read_ber = or51211_read_ber,
	.read_signal_strength = or51211_read_signal_strength,
	.read_snr = or51211_read_snr,
	.read_ucblocks = or51211_read_ucblocks,
	};

	module_param(debug, int, 0644);
	MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

	MODULE_DESCRIPTION("Oren OR51211 VSB [pcHDTV HD-2000] Demodulator Driver");
	MODULE_AUTHOR("Kirk Lapray");
	MODULE_LICENSE("GPL");

	EXPORT_SYMBOL_GPL(or51211_attach);