drivers/media/dvb-frontends/stb6100.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
 	STB6100 Silicon Tuner
 	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

 	Copyright (C) ST Microelectronics

 */

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

 #include <media/dvb_frontend.h>
 #include "stb6100.h"

 static unsigned int verbose;
 module_param(verbose, int, 0644);

 /* Max transfer size done by I2C transfer functions */
 #define MAX_XFER_SIZE  64

 #define FE_ERROR		0
 #define FE_NOTICE		1
 #define FE_INFO			2
 #define FE_DEBUG		3

 #define dprintk(x, y, z, format, arg...) do {						\
 	if (z) {									\
 		if	((x > FE_ERROR) && (x > y))					\
 			printk(KERN_ERR "%s: " format "\n", __func__ , ##arg);		\
 		else if	((x > FE_NOTICE) && (x > y))					\
 			printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg);	\
 		else if ((x > FE_INFO) && (x > y))					\
 			printk(KERN_INFO "%s: " format "\n", __func__ , ##arg);		\
 		else if ((x > FE_DEBUG) && (x > y))					\
 			printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg);	\
 	} else {									\
 		if (x > y)								\
 			printk(format, ##arg);						\
 	}										\
 } while (0)

 struct stb6100_lkup {
 	u32 val_low;
 	u32 val_high;
 	u8   reg;
 };

 static void stb6100_release(struct dvb_frontend *fe);

 static const struct stb6100_lkup lkup[] = {
 	{       0,  950000, 0x0a },
 	{  950000, 1000000, 0x0a },
 	{ 1000000, 1075000, 0x0c },
 	{ 1075000, 1200000, 0x00 },
 	{ 1200000, 1300000, 0x01 },
 	{ 1300000, 1370000, 0x02 },
 	{ 1370000, 1470000, 0x04 },
 	{ 1470000, 1530000, 0x05 },
 	{ 1530000, 1650000, 0x06 },
 	{ 1650000, 1800000, 0x08 },
 	{ 1800000, 1950000, 0x0a },
 	{ 1950000, 2150000, 0x0c },
 	{ 2150000, 9999999, 0x0c },
 	{       0,       0, 0x00 }
 };

 /* Register names for easy debugging.	*/
 static const char *stb6100_regnames[] = {
 	[STB6100_LD]		= "LD",
 	[STB6100_VCO]		= "VCO",
 	[STB6100_NI]		= "NI",
 	[STB6100_NF_LSB]	= "NF",
 	[STB6100_K]		= "K",
 	[STB6100_G]		= "G",
 	[STB6100_F]		= "F",
 	[STB6100_DLB]		= "DLB",
 	[STB6100_TEST1]		= "TEST1",
 	[STB6100_FCCK]		= "FCCK",
 	[STB6100_LPEN]		= "LPEN",
 	[STB6100_TEST3]		= "TEST3",
 };

 /* Template for normalisation, i.e. setting unused or undocumented
  * bits as required according to the documentation.
  */
 struct stb6100_regmask {
 	u8 mask;
 	u8 set;
 };

 static const struct stb6100_regmask stb6100_template[] = {
 	[STB6100_LD]		= { 0xff, 0x00 },
 	[STB6100_VCO]		= { 0xff, 0x00 },
 	[STB6100_NI]		= { 0xff, 0x00 },
 	[STB6100_NF_LSB]	= { 0xff, 0x00 },
 	[STB6100_K]		= { 0xc7, 0x38 },
 	[STB6100_G]		= { 0xef, 0x10 },
 	[STB6100_F]		= { 0x1f, 0xc0 },
 	[STB6100_DLB]		= { 0x38, 0xc4 },
 	[STB6100_TEST1]		= { 0x00, 0x8f },
 	[STB6100_FCCK]		= { 0x40, 0x0d },
 	[STB6100_LPEN]		= { 0xf0, 0x0b },
 	[STB6100_TEST3]		= { 0x00, 0xde },
 };

 /*
  * Currently unused. Some boards might need it in the future
  */
 static inline void stb6100_normalise_regs(u8 regs[])
 {
 	int i;

 	for (i = 0; i < STB6100_NUMREGS; i++)
 		regs[i] = (regs[i] & stb6100_template[i].mask) | stb6100_template[i].set;
 }

 static int stb6100_read_regs(struct stb6100_state *state, u8 regs[])
 {
 	int rc;
 	struct i2c_msg msg = {
 		.addr	= state->config->tuner_address,
 		.flags	= I2C_M_RD,
 		.buf	= regs,
 		.len	= STB6100_NUMREGS
 	};

 	rc = i2c_transfer(state->i2c, &msg, 1);
 	if (unlikely(rc != 1)) {
 		dprintk(verbose, FE_ERROR, 1, "Read (0x%x) err, rc=[%d]",
 			state->config->tuner_address, rc);

 		return -EREMOTEIO;
 	}
 	if (unlikely(verbose > FE_DEBUG)) {
 		int i;

 		dprintk(verbose, FE_DEBUG, 1, "    Read from 0x%02x", state->config->tuner_address);
 		for (i = 0; i < STB6100_NUMREGS; i++)
 			dprintk(verbose, FE_DEBUG, 1, "        %s: 0x%02x", stb6100_regnames[i], regs[i]);
 	}
 	return 0;
 }

 static int stb6100_read_reg(struct stb6100_state *state, u8 reg)
 {
 	u8 regs[STB6100_NUMREGS];

 	struct i2c_msg msg = {
 		.addr	= state->config->tuner_address + reg,
 		.flags	= I2C_M_RD,
 		.buf	= regs,
 		.len	= 1
 	};

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

 	if (unlikely(reg >= STB6100_NUMREGS)) {
 		dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
 		return -EINVAL;
 	}
 	if (unlikely(verbose > FE_DEBUG)) {
 		dprintk(verbose, FE_DEBUG, 1, "    Read from 0x%02x", state->config->tuner_address);
 		dprintk(verbose, FE_DEBUG, 1, "        %s: 0x%02x", stb6100_regnames[reg], regs[0]);
 	}

 	return (unsigned int)regs[0];
 }

 static int stb6100_write_reg_range(struct stb6100_state *state, u8 buf[], int start, int len)
 {
 	int rc;
 	u8 cmdbuf[MAX_XFER_SIZE];
 	struct i2c_msg msg = {
 		.addr	= state->config->tuner_address,
 		.flags	= 0,
 		.buf	= cmdbuf,
 		.len	= len + 1
 	};

 	if (1 + len > sizeof(cmdbuf)) {
 		printk(KERN_WARNING
 		       "%s: i2c wr: len=%d is too big!\n",
 		       KBUILD_MODNAME, len);
 		return -EINVAL;
 	}

 	if (unlikely(start < 1 || start + len > STB6100_NUMREGS)) {
 		dprintk(verbose, FE_ERROR, 1, "Invalid register range %d:%d",
 			start, len);
 		return -EINVAL;
 	}
 	memcpy(&cmdbuf[1], buf, len);
 	cmdbuf[0] = start;

 	if (unlikely(verbose > FE_DEBUG)) {
 		int i;

 		dprintk(verbose, FE_DEBUG, 1, "    Write @ 0x%02x: [%d:%d]", state->config->tuner_address, start, len);
 		for (i = 0; i < len; i++)
 			dprintk(verbose, FE_DEBUG, 1, "        %s: 0x%02x", stb6100_regnames[start + i], buf[i]);
 	}
 	rc = i2c_transfer(state->i2c, &msg, 1);
 	if (unlikely(rc != 1)) {
 		dprintk(verbose, FE_ERROR, 1, "(0x%x) write err [%d:%d], rc=[%d]",
 			(unsigned int)state->config->tuner_address, start, len,	rc);
 		return -EREMOTEIO;
 	}
 	return 0;
 }

 static int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data)
 {
 	u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */

 	if (unlikely(reg >= STB6100_NUMREGS)) {
 		dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
 		return -EREMOTEIO;
 	}
 	tmp = (tmp & stb6100_template[reg].mask) | stb6100_template[reg].set;
 	return stb6100_write_reg_range(state, &tmp, reg, 1);
 }


 static int stb6100_get_status(struct dvb_frontend *fe, u32 *status)
 {
 	int rc;
 	struct stb6100_state *state = fe->tuner_priv;

 	rc = stb6100_read_reg(state, STB6100_LD);
 	if (rc < 0) {
 		dprintk(verbose, FE_ERROR, 1, "%s failed", __func__);
 		return rc;
 	}
 	return (rc & STB6100_LD_LOCK) ? TUNER_STATUS_LOCKED : 0;
 }

 static int stb6100_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 {
 	int rc;
 	u8 f;
 	u32 bw;
 	struct stb6100_state *state = fe->tuner_priv;

 	rc = stb6100_read_reg(state, STB6100_F);
 	if (rc < 0)
 		return rc;
 	f = rc & STB6100_F_F;

 	bw = (f + 5) * 2000;	/* x2 for ZIF	*/

 	*bandwidth = state->bandwidth = bw * 1000;
 	dprintk(verbose, FE_DEBUG, 1, "bandwidth = %u Hz", state->bandwidth);
 	return 0;
 }

 static int stb6100_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 {
 	u32 tmp;
 	int rc;
 	struct stb6100_state *state = fe->tuner_priv;

 	dprintk(verbose, FE_DEBUG, 1, "set bandwidth to %u Hz", bandwidth);

 	bandwidth /= 2; /* ZIF */

 	if (bandwidth >= 36000000)	/* F[4:0] BW/2 max =31+5=36 mhz for F=31	*/
 		tmp = 31;
 	else if (bandwidth <= 5000000)	/* bw/2 min = 5Mhz for F=0			*/
 		tmp = 0;
 	else				/* if 5 < bw/2 < 36				*/
 		tmp = (bandwidth + 500000) / 1000000 - 5;

 	/* Turn on LPF bandwidth setting clock control,
 	 * set bandwidth, wait 10ms, turn off.
 	 */
 	rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d | STB6100_FCCK_FCCK);
 	if (rc < 0)
 		return rc;
 	rc = stb6100_write_reg(state, STB6100_F, 0xc0 | tmp);
 	if (rc < 0)
 		return rc;

 	msleep(5);  /*  This is dangerous as another (related) thread may start */

 	rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
 	if (rc < 0)
 		return rc;

 	msleep(10);  /*  This is dangerous as another (related) thread may start */

 	return 0;
 }

 static int stb6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 {
 	int rc;
 	u32 nint, nfrac, fvco;
 	int psd2, odiv;
 	struct stb6100_state *state = fe->tuner_priv;
 	u8 regs[STB6100_NUMREGS];

 	rc = stb6100_read_regs(state, regs);
 	if (rc < 0)
 		return rc;

 	odiv = (regs[STB6100_VCO] & STB6100_VCO_ODIV) >> STB6100_VCO_ODIV_SHIFT;
 	psd2 = (regs[STB6100_K] & STB6100_K_PSD2) >> STB6100_K_PSD2_SHIFT;
 	nint = regs[STB6100_NI];
 	nfrac = ((regs[STB6100_K] & STB6100_K_NF_MSB) << 8) | regs[STB6100_NF_LSB];
 	fvco = (nfrac * state->reference >> (9 - psd2)) + (nint * state->reference << psd2);
 	*frequency = state->frequency = fvco >> (odiv + 1);

 	dprintk(verbose, FE_DEBUG, 1,
 		"frequency = %u kHz, odiv = %u, psd2 = %u, fxtal = %u kHz, fvco = %u kHz, N(I) = %u, N(F) = %u",
 		state->frequency, odiv, psd2, state->reference,	fvco, nint, nfrac);
 	return 0;
 }


 static int stb6100_set_frequency(struct dvb_frontend *fe, u32 frequency)
 {
 	int rc;
 	const struct stb6100_lkup *ptr;
 	struct stb6100_state *state = fe->tuner_priv;
 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;

 	u32 srate = 0, fvco, nint, nfrac;
 	u8 regs[STB6100_NUMREGS];
 	u8 g, psd2, odiv;

 	dprintk(verbose, FE_DEBUG, 1, "Version 2010-8-14 13:51");

 	if (fe->ops.get_frontend) {
 		dprintk(verbose, FE_DEBUG, 1, "Get frontend parameters");
 		fe->ops.get_frontend(fe, p);
 	}
 	srate = p->symbol_rate;

 	/* Set up tuner cleanly, LPF calibration on */
 	rc = stb6100_write_reg(state, STB6100_FCCK, 0x4d | STB6100_FCCK_FCCK);
 	if (rc < 0)
 		return rc;  /* allow LPF calibration */

 	/* PLL Loop disabled, bias on, VCO on, synth on */
 	regs[STB6100_LPEN] = 0xeb;
 	rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
 	if (rc < 0)
 		return rc;

 	/* Program the registers with their data values */

 	/* VCO divide ratio (LO divide ratio, VCO prescaler enable).	*/
 	if (frequency <= 1075000)
 		odiv = 1;
 	else
 		odiv = 0;

 	/* VCO enabled, search clock off as per LL3.7, 3.4.1 */
 	regs[STB6100_VCO] = 0xe0 | (odiv << STB6100_VCO_ODIV_SHIFT);

 	/* OSM	*/
 	for (ptr = lkup;
 	     (ptr->val_high != 0) && !CHKRANGE(frequency, ptr->val_low, ptr->val_high);
 	     ptr++);

 	if (ptr->val_high == 0) {
 		printk(KERN_ERR "%s: frequency out of range: %u kHz\n", __func__, frequency);
 		return -EINVAL;
 	}
 	regs[STB6100_VCO] = (regs[STB6100_VCO] & ~STB6100_VCO_OSM) | ptr->reg;
 	rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 	if (rc < 0)
 		return rc;

 	if ((frequency > 1075000) && (frequency <= 1325000))
 		psd2 = 0;
 	else
 		psd2 = 1;
 	/* F(VCO) = F(LO) * (ODIV == 0 ? 2 : 4)			*/
 	fvco = frequency << (1 + odiv);
 	/* N(I) = floor(f(VCO) / (f(XTAL) * (PSD2 ? 2 : 1)))	*/
 	nint = fvco / (state->reference << psd2);
 	/* N(F) = round(f(VCO) / f(XTAL) * (PSD2 ? 2 : 1) - N(I)) * 2 ^ 9	*/
 	nfrac = DIV_ROUND_CLOSEST((fvco - (nint * state->reference << psd2))
 					 << (9 - psd2), state->reference);

 	/* NI */
 	regs[STB6100_NI] = nint;
 	rc = stb6100_write_reg(state, STB6100_NI, regs[STB6100_NI]);
 	if (rc < 0)
 		return rc;

 	/* NF */
 	regs[STB6100_NF_LSB] = nfrac;
 	rc = stb6100_write_reg(state, STB6100_NF_LSB, regs[STB6100_NF_LSB]);
 	if (rc < 0)
 		return rc;

 	/* K */
 	regs[STB6100_K] = (0x38 & ~STB6100_K_PSD2) | (psd2 << STB6100_K_PSD2_SHIFT);
 	regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_NF_MSB) | ((nfrac >> 8) & STB6100_K_NF_MSB);
 	rc = stb6100_write_reg(state, STB6100_K, regs[STB6100_K]);
 	if (rc < 0)
 		return rc;

 	/* G Baseband gain. */
 	if (srate >= 15000000)
 		g = 9;  /*  +4 dB */
 	else if (srate >= 5000000)
 		g = 11; /*  +8 dB */
 	else
 		g = 14; /* +14 dB */

 	regs[STB6100_G] = (0x10 & ~STB6100_G_G) | g;
 	regs[STB6100_G] &= ~STB6100_G_GCT; /* mask GCT */
 	regs[STB6100_G] |= (1 << 5); /* 2Vp-p Mode */
 	rc = stb6100_write_reg(state, STB6100_G, regs[STB6100_G]);
 	if (rc < 0)
 		return rc;

 	/* F we don't write as it is set up in BW set */

 	/* DLB set DC servo loop BW to 160Hz (LLA 3.8 / 2.1) */
 	regs[STB6100_DLB] = 0xcc;
 	rc = stb6100_write_reg(state, STB6100_DLB, regs[STB6100_DLB]);
 	if (rc < 0)
 		return rc;

 	dprintk(verbose, FE_DEBUG, 1,
 		"frequency = %u, srate = %u, g = %u, odiv = %u, psd2 = %u, fxtal = %u, osm = %u, fvco = %u, N(I) = %u, N(F) = %u",
 		frequency, srate, (unsigned int)g, (unsigned int)odiv,
 		(unsigned int)psd2, state->reference,
 		ptr->reg, fvco, nint, nfrac);

 	/* Set up the test registers */
 	regs[STB6100_TEST1] = 0x8f;
 	rc = stb6100_write_reg(state, STB6100_TEST1, regs[STB6100_TEST1]);
 	if (rc < 0)
 		return rc;
 	regs[STB6100_TEST3] = 0xde;
 	rc = stb6100_write_reg(state, STB6100_TEST3, regs[STB6100_TEST3]);
 	if (rc < 0)
 		return rc;

 	/* Bring up tuner according to LLA 3.7 3.4.1, step 2 */
 	regs[STB6100_LPEN] = 0xfb; /* PLL Loop enabled, bias on, VCO on, synth on */
 	rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
 	if (rc < 0)
 		return rc;

 	msleep(2);

 	/* Bring up tuner according to LLA 3.7 3.4.1, step 3 */
 	regs[STB6100_VCO] &= ~STB6100_VCO_OCK;		/* VCO fast search		*/
 	rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 	if (rc < 0)
 		return rc;

 	msleep(10);  /*  This is dangerous as another (related) thread may start */ /* wait for LO to lock */

 	regs[STB6100_VCO] &= ~STB6100_VCO_OSCH;		/* vco search disabled		*/
 	regs[STB6100_VCO] |= STB6100_VCO_OCK;		/* search clock off		*/
 	rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 	if (rc < 0)
 		return rc;

 	rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
 	if (rc < 0)
 		return rc;  /* Stop LPF calibration */

 	msleep(10);  /*  This is dangerous as another (related) thread may start */
 		     /* wait for stabilisation, (should not be necessary)		*/
 	return 0;
 }

 static int stb6100_sleep(struct dvb_frontend *fe)
 {
 	/* TODO: power down	*/
 	return 0;
 }

 static int stb6100_init(struct dvb_frontend *fe)
 {
 	struct stb6100_state *state = fe->tuner_priv;
 	int refclk = 27000000; /* Hz */

 	/*
 	 * iqsense = 1
 	 * tunerstep = 125000
 	 */
 	state->bandwidth        = 36000000;		/* Hz	*/
 	state->reference	= refclk / 1000;	/* kHz	*/

 	/* Set default bandwidth. Modified, PN 13-May-10	*/
 	return 0;
 }

 static int stb6100_set_params(struct dvb_frontend *fe)
 {
 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

 	if (c->frequency > 0)
 		stb6100_set_frequency(fe, c->frequency);

 	if (c->bandwidth_hz > 0)
 		stb6100_set_bandwidth(fe, c->bandwidth_hz);

 	return 0;
 }

 static const struct dvb_tuner_ops stb6100_ops = {
 	.info = {
 		.name			= "STB6100 Silicon Tuner",
 		.frequency_min_hz	=  950 * MHz,
 		.frequency_max_hz	= 2150 * MHz,
 	},

 	.init		= stb6100_init,
 	.sleep          = stb6100_sleep,
 	.get_status	= stb6100_get_status,
 	.set_params	= stb6100_set_params,
 	.get_frequency  = stb6100_get_frequency,
 	.get_bandwidth  = stb6100_get_bandwidth,
 	.release	= stb6100_release
 };

 struct dvb_frontend *stb6100_attach(struct dvb_frontend *fe,
 				    const struct stb6100_config *config,
 				    struct i2c_adapter *i2c)
 {
 	struct stb6100_state *state = NULL;

 	state = kzalloc(sizeof (struct stb6100_state), GFP_KERNEL);
 	if (!state)
 		return NULL;

 	state->config		= config;
 	state->i2c		= i2c;
 	state->frontend		= fe;
 	state->reference	= config->refclock / 1000; /* kHz */
 	fe->tuner_priv		= state;
 	fe->ops.tuner_ops	= stb6100_ops;

 	printk("%s: Attaching STB6100 \n", __func__);
 	return fe;
 }

 static void stb6100_release(struct dvb_frontend *fe)
 {
 	struct stb6100_state *state = fe->tuner_priv;

 	fe->tuner_priv = NULL;
 	kfree(state);
 }

 EXPORT_SYMBOL_GPL(stb6100_attach);
 MODULE_PARM_DESC(verbose, "Set Verbosity level");

 MODULE_AUTHOR("Manu Abraham");
 MODULE_DESCRIPTION("STB6100 Silicon tuner");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	STB6100 Silicon Tuner
	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

	Copyright (C) ST Microelectronics

	*/

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

	#include <media/dvb_frontend.h>
	#include "stb6100.h"

	static unsigned int verbose;
	module_param(verbose, int, 0644);

	/* Max transfer size done by I2C transfer functions */
	#define MAX_XFER_SIZE 64

	#define FE_ERROR 0
	#define FE_NOTICE 1
	#define FE_INFO 2
	#define FE_DEBUG 3

	#define dprintk(x, y, z, format, arg...) do { \
	if (z) { \
	if ((x > FE_ERROR) && (x > y)) \
	printk(KERN_ERR "%s: " format "\n", __func__ , ##arg); \
	else if ((x > FE_NOTICE) && (x > y)) \
	printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg); \
	else if ((x > FE_INFO) && (x > y)) \
	printk(KERN_INFO "%s: " format "\n", __func__ , ##arg); \
	else if ((x > FE_DEBUG) && (x > y)) \
	printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg); \
	} else { \
	if (x > y) \
	printk(format, ##arg); \
	} \
	} while (0)

	struct stb6100_lkup {
	u32 val_low;
	u32 val_high;
	u8 reg;
	};

	static void stb6100_release(struct dvb_frontend *fe);

	static const struct stb6100_lkup lkup[] = {
	{ 0, 950000, 0x0a },
	{ 950000, 1000000, 0x0a },
	{ 1000000, 1075000, 0x0c },
	{ 1075000, 1200000, 0x00 },
	{ 1200000, 1300000, 0x01 },
	{ 1300000, 1370000, 0x02 },
	{ 1370000, 1470000, 0x04 },
	{ 1470000, 1530000, 0x05 },
	{ 1530000, 1650000, 0x06 },
	{ 1650000, 1800000, 0x08 },
	{ 1800000, 1950000, 0x0a },
	{ 1950000, 2150000, 0x0c },
	{ 2150000, 9999999, 0x0c },
	{ 0, 0, 0x00 }
	};

	/* Register names for easy debugging. */
	static const char *stb6100_regnames[] = {
	[STB6100_LD] = "LD",
	[STB6100_VCO] = "VCO",
	[STB6100_NI] = "NI",
	[STB6100_NF_LSB] = "NF",
	[STB6100_K] = "K",
	[STB6100_G] = "G",
	[STB6100_F] = "F",
	[STB6100_DLB] = "DLB",
	[STB6100_TEST1] = "TEST1",
	[STB6100_FCCK] = "FCCK",
	[STB6100_LPEN] = "LPEN",
	[STB6100_TEST3] = "TEST3",
	};

	/* Template for normalisation, i.e. setting unused or undocumented
	* bits as required according to the documentation.
	*/
	struct stb6100_regmask {
	u8 mask;
	u8 set;
	};

	static const struct stb6100_regmask stb6100_template[] = {
	[STB6100_LD] = { 0xff, 0x00 },
	[STB6100_VCO] = { 0xff, 0x00 },
	[STB6100_NI] = { 0xff, 0x00 },
	[STB6100_NF_LSB] = { 0xff, 0x00 },
	[STB6100_K] = { 0xc7, 0x38 },
	[STB6100_G] = { 0xef, 0x10 },
	[STB6100_F] = { 0x1f, 0xc0 },
	[STB6100_DLB] = { 0x38, 0xc4 },
	[STB6100_TEST1] = { 0x00, 0x8f },
	[STB6100_FCCK] = { 0x40, 0x0d },
	[STB6100_LPEN] = { 0xf0, 0x0b },
	[STB6100_TEST3] = { 0x00, 0xde },
	};

	/*
	* Currently unused. Some boards might need it in the future
	*/
	static inline void stb6100_normalise_regs(u8 regs[])
	{
	int i;

	for (i = 0; i < STB6100_NUMREGS; i++)
	regs[i] = (regs[i] & stb6100_template[i].mask) \| stb6100_template[i].set;
	}

	static int stb6100_read_regs(struct stb6100_state *state, u8 regs[])
	{
	int rc;
	struct i2c_msg msg = {
	.addr = state->config->tuner_address,
	.flags = I2C_M_RD,
	.buf = regs,
	.len = STB6100_NUMREGS
	};

	rc = i2c_transfer(state->i2c, &msg, 1);
	if (unlikely(rc != 1)) {
	dprintk(verbose, FE_ERROR, 1, "Read (0x%x) err, rc=[%d]",
	state->config->tuner_address, rc);

	return -EREMOTEIO;
	}
	if (unlikely(verbose > FE_DEBUG)) {
	int i;

	dprintk(verbose, FE_DEBUG, 1, " Read from 0x%02x", state->config->tuner_address);
	for (i = 0; i < STB6100_NUMREGS; i++)
	dprintk(verbose, FE_DEBUG, 1, " %s: 0x%02x", stb6100_regnames[i], regs[i]);
	}
	return 0;
	}

	static int stb6100_read_reg(struct stb6100_state *state, u8 reg)
	{
	u8 regs[STB6100_NUMREGS];

	struct i2c_msg msg = {
	.addr = state->config->tuner_address + reg,
	.flags = I2C_M_RD,
	.buf = regs,
	.len = 1
	};

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

	if (unlikely(reg >= STB6100_NUMREGS)) {
	dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
	return -EINVAL;
	}
	if (unlikely(verbose > FE_DEBUG)) {
	dprintk(verbose, FE_DEBUG, 1, " Read from 0x%02x", state->config->tuner_address);
	dprintk(verbose, FE_DEBUG, 1, " %s: 0x%02x", stb6100_regnames[reg], regs[0]);
	}

	return (unsigned int)regs[0];
	}

	static int stb6100_write_reg_range(struct stb6100_state *state, u8 buf[], int start, int len)
	{
	int rc;
	u8 cmdbuf[MAX_XFER_SIZE];
	struct i2c_msg msg = {
	.addr = state->config->tuner_address,
	.flags = 0,
	.buf = cmdbuf,
	.len = len + 1
	};

	if (1 + len > sizeof(cmdbuf)) {
	printk(KERN_WARNING
	"%s: i2c wr: len=%d is too big!\n",
	KBUILD_MODNAME, len);
	return -EINVAL;
	}

	if (unlikely(start < 1 \|\| start + len > STB6100_NUMREGS)) {
	dprintk(verbose, FE_ERROR, 1, "Invalid register range %d:%d",
	start, len);
	return -EINVAL;
	}
	memcpy(&cmdbuf[1], buf, len);
	cmdbuf[0] = start;

	if (unlikely(verbose > FE_DEBUG)) {
	int i;

	dprintk(verbose, FE_DEBUG, 1, " Write @ 0x%02x: [%d:%d]", state->config->tuner_address, start, len);
	for (i = 0; i < len; i++)
	dprintk(verbose, FE_DEBUG, 1, " %s: 0x%02x", stb6100_regnames[start + i], buf[i]);
	}
	rc = i2c_transfer(state->i2c, &msg, 1);
	if (unlikely(rc != 1)) {
	dprintk(verbose, FE_ERROR, 1, "(0x%x) write err [%d:%d], rc=[%d]",
	(unsigned int)state->config->tuner_address, start, len, rc);
	return -EREMOTEIO;
	}
	return 0;
	}

	static int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data)
	{
	u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */

	if (unlikely(reg >= STB6100_NUMREGS)) {
	dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
	return -EREMOTEIO;
	}
	tmp = (tmp & stb6100_template[reg].mask) \| stb6100_template[reg].set;
	return stb6100_write_reg_range(state, &tmp, reg, 1);
	}


	static int stb6100_get_status(struct dvb_frontend fe, u32 status)
	{
	int rc;
	struct stb6100_state *state = fe->tuner_priv;

	rc = stb6100_read_reg(state, STB6100_LD);
	if (rc < 0) {
	dprintk(verbose, FE_ERROR, 1, "%s failed", __func__);
	return rc;
	}
	return (rc & STB6100_LD_LOCK) ? TUNER_STATUS_LOCKED : 0;
	}

	static int stb6100_get_bandwidth(struct dvb_frontend fe, u32 bandwidth)
	{
	int rc;
	u8 f;
	u32 bw;
	struct stb6100_state *state = fe->tuner_priv;

	rc = stb6100_read_reg(state, STB6100_F);
	if (rc < 0)
	return rc;
	f = rc & STB6100_F_F;

	bw = (f + 5) * 2000; /* x2 for ZIF */

	bandwidth = state->bandwidth = bw 1000;
	dprintk(verbose, FE_DEBUG, 1, "bandwidth = %u Hz", state->bandwidth);
	return 0;
	}

	static int stb6100_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
	{
	u32 tmp;
	int rc;
	struct stb6100_state *state = fe->tuner_priv;

	dprintk(verbose, FE_DEBUG, 1, "set bandwidth to %u Hz", bandwidth);

	bandwidth /= 2; /* ZIF */

	if (bandwidth >= 36000000) /* F[4:0] BW/2 max =31+5=36 mhz for F=31 */
	tmp = 31;
	else if (bandwidth <= 5000000) /* bw/2 min = 5Mhz for F=0 */
	tmp = 0;
	else /* if 5 < bw/2 < 36 */
	tmp = (bandwidth + 500000) / 1000000 - 5;

	/* Turn on LPF bandwidth setting clock control,
	* set bandwidth, wait 10ms, turn off.
	*/
	rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d \| STB6100_FCCK_FCCK);
	if (rc < 0)
	return rc;
	rc = stb6100_write_reg(state, STB6100_F, 0xc0 \| tmp);
	if (rc < 0)
	return rc;

	msleep(5); /* This is dangerous as another (related) thread may start */

	rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
	if (rc < 0)
	return rc;

	msleep(10); /* This is dangerous as another (related) thread may start */

	return 0;
	}

	static int stb6100_get_frequency(struct dvb_frontend fe, u32 frequency)
	{
	int rc;
	u32 nint, nfrac, fvco;
	int psd2, odiv;
	struct stb6100_state *state = fe->tuner_priv;
	u8 regs[STB6100_NUMREGS];

	rc = stb6100_read_regs(state, regs);
	if (rc < 0)
	return rc;

	odiv = (regs[STB6100_VCO] & STB6100_VCO_ODIV) >> STB6100_VCO_ODIV_SHIFT;
	psd2 = (regs[STB6100_K] & STB6100_K_PSD2) >> STB6100_K_PSD2_SHIFT;
	nint = regs[STB6100_NI];
	nfrac = ((regs[STB6100_K] & STB6100_K_NF_MSB) << 8) \| regs[STB6100_NF_LSB];
	fvco = (nfrac * state->reference >> (9 - psd2)) + (nint * state->reference << psd2);
	*frequency = state->frequency = fvco >> (odiv + 1);

	dprintk(verbose, FE_DEBUG, 1,
	"frequency = %u kHz, odiv = %u, psd2 = %u, fxtal = %u kHz, fvco = %u kHz, N(I) = %u, N(F) = %u",
	state->frequency, odiv, psd2, state->reference, fvco, nint, nfrac);
	return 0;
	}


	static int stb6100_set_frequency(struct dvb_frontend *fe, u32 frequency)
	{
	int rc;
	const struct stb6100_lkup *ptr;
	struct stb6100_state *state = fe->tuner_priv;
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;

	u32 srate = 0, fvco, nint, nfrac;
	u8 regs[STB6100_NUMREGS];
	u8 g, psd2, odiv;

	dprintk(verbose, FE_DEBUG, 1, "Version 2010-8-14 13:51");

	if (fe->ops.get_frontend) {
	dprintk(verbose, FE_DEBUG, 1, "Get frontend parameters");
	fe->ops.get_frontend(fe, p);
	}
	srate = p->symbol_rate;

	/* Set up tuner cleanly, LPF calibration on */
	rc = stb6100_write_reg(state, STB6100_FCCK, 0x4d \| STB6100_FCCK_FCCK);
	if (rc < 0)
	return rc; /* allow LPF calibration */

	/* PLL Loop disabled, bias on, VCO on, synth on */
	regs[STB6100_LPEN] = 0xeb;
	rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
	if (rc < 0)
	return rc;

	/* Program the registers with their data values */

	/* VCO divide ratio (LO divide ratio, VCO prescaler enable). */
	if (frequency <= 1075000)
	odiv = 1;
	else
	odiv = 0;

	/* VCO enabled, search clock off as per LL3.7, 3.4.1 */
	regs[STB6100_VCO] = 0xe0 \| (odiv << STB6100_VCO_ODIV_SHIFT);

	/* OSM */
	for (ptr = lkup;
	(ptr->val_high != 0) && !CHKRANGE(frequency, ptr->val_low, ptr->val_high);
	ptr++);

	if (ptr->val_high == 0) {
	printk(KERN_ERR "%s: frequency out of range: %u kHz\n", __func__, frequency);
	return -EINVAL;
	}
	regs[STB6100_VCO] = (regs[STB6100_VCO] & ~STB6100_VCO_OSM) \| ptr->reg;
	rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
	if (rc < 0)
	return rc;

	if ((frequency > 1075000) && (frequency <= 1325000))
	psd2 = 0;
	else
	psd2 = 1;
	/* F(VCO) = F(LO) * (ODIV == 0 ? 2 : 4) */
	fvco = frequency << (1 + odiv);
	/* N(I) = floor(f(VCO) / (f(XTAL) * (PSD2 ? 2 : 1))) */
	nint = fvco / (state->reference << psd2);
	/* N(F) = round(f(VCO) / f(XTAL) * (PSD2 ? 2 : 1) - N(I)) * 2 ^ 9 */
	nfrac = DIV_ROUND_CLOSEST((fvco - (nint * state->reference << psd2))
	<< (9 - psd2), state->reference);

	/* NI */
	regs[STB6100_NI] = nint;
	rc = stb6100_write_reg(state, STB6100_NI, regs[STB6100_NI]);
	if (rc < 0)
	return rc;

	/* NF */
	regs[STB6100_NF_LSB] = nfrac;
	rc = stb6100_write_reg(state, STB6100_NF_LSB, regs[STB6100_NF_LSB]);
	if (rc < 0)
	return rc;

	/* K */
	regs[STB6100_K] = (0x38 & ~STB6100_K_PSD2) \| (psd2 << STB6100_K_PSD2_SHIFT);
	regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_NF_MSB) \| ((nfrac >> 8) & STB6100_K_NF_MSB);
	rc = stb6100_write_reg(state, STB6100_K, regs[STB6100_K]);
	if (rc < 0)
	return rc;

	/* G Baseband gain. */
	if (srate >= 15000000)
	g = 9; /* +4 dB */
	else if (srate >= 5000000)
	g = 11; /* +8 dB */
	else
	g = 14; /* +14 dB */

	regs[STB6100_G] = (0x10 & ~STB6100_G_G) \| g;
	regs[STB6100_G] &= ~STB6100_G_GCT; /* mask GCT */
	regs[STB6100_G] \|= (1 << 5); /* 2Vp-p Mode */
	rc = stb6100_write_reg(state, STB6100_G, regs[STB6100_G]);
	if (rc < 0)
	return rc;

	/* F we don't write as it is set up in BW set */

	/* DLB set DC servo loop BW to 160Hz (LLA 3.8 / 2.1) */
	regs[STB6100_DLB] = 0xcc;
	rc = stb6100_write_reg(state, STB6100_DLB, regs[STB6100_DLB]);
	if (rc < 0)
	return rc;

	dprintk(verbose, FE_DEBUG, 1,
	"frequency = %u, srate = %u, g = %u, odiv = %u, psd2 = %u, fxtal = %u, osm = %u, fvco = %u, N(I) = %u, N(F) = %u",
	frequency, srate, (unsigned int)g, (unsigned int)odiv,
	(unsigned int)psd2, state->reference,
	ptr->reg, fvco, nint, nfrac);

	/* Set up the test registers */
	regs[STB6100_TEST1] = 0x8f;
	rc = stb6100_write_reg(state, STB6100_TEST1, regs[STB6100_TEST1]);
	if (rc < 0)
	return rc;
	regs[STB6100_TEST3] = 0xde;
	rc = stb6100_write_reg(state, STB6100_TEST3, regs[STB6100_TEST3]);
	if (rc < 0)
	return rc;

	/* Bring up tuner according to LLA 3.7 3.4.1, step 2 */
	regs[STB6100_LPEN] = 0xfb; /* PLL Loop enabled, bias on, VCO on, synth on */
	rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
	if (rc < 0)
	return rc;

	msleep(2);

	/* Bring up tuner according to LLA 3.7 3.4.1, step 3 */
	regs[STB6100_VCO] &= ~STB6100_VCO_OCK; /* VCO fast search */
	rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
	if (rc < 0)
	return rc;

	msleep(10); /* This is dangerous as another (related) thread may start / / wait for LO to lock */

	regs[STB6100_VCO] &= ~STB6100_VCO_OSCH; /* vco search disabled */
	regs[STB6100_VCO] \|= STB6100_VCO_OCK; /* search clock off */
	rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
	if (rc < 0)
	return rc;

	rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
	if (rc < 0)
	return rc; /* Stop LPF calibration */

	msleep(10); /* This is dangerous as another (related) thread may start */
	/* wait for stabilisation, (should not be necessary) */
	return 0;
	}

	static int stb6100_sleep(struct dvb_frontend *fe)
	{
	/* TODO: power down */
	return 0;
	}

	static int stb6100_init(struct dvb_frontend *fe)
	{
	struct stb6100_state *state = fe->tuner_priv;
	int refclk = 27000000; /* Hz */

	/*
	* iqsense = 1
	* tunerstep = 125000
	*/
	state->bandwidth = 36000000; /* Hz */
	state->reference = refclk / 1000; /* kHz */

	/* Set default bandwidth. Modified, PN 13-May-10 */
	return 0;
	}

	static int stb6100_set_params(struct dvb_frontend *fe)
	{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	if (c->frequency > 0)
	stb6100_set_frequency(fe, c->frequency);

	if (c->bandwidth_hz > 0)
	stb6100_set_bandwidth(fe, c->bandwidth_hz);

	return 0;
	}

	static const struct dvb_tuner_ops stb6100_ops = {
	.info = {
	.name = "STB6100 Silicon Tuner",
	.frequency_min_hz = 950 * MHz,
	.frequency_max_hz = 2150 * MHz,
	},

	.init = stb6100_init,
	.sleep = stb6100_sleep,
	.get_status = stb6100_get_status,
	.set_params = stb6100_set_params,
	.get_frequency = stb6100_get_frequency,
	.get_bandwidth = stb6100_get_bandwidth,
	.release = stb6100_release
	};

	struct dvb_frontend stb6100_attach(struct dvb_frontend fe,
	const struct stb6100_config *config,
	struct i2c_adapter *i2c)
	{
	struct stb6100_state *state = NULL;

	state = kzalloc(sizeof (struct stb6100_state), GFP_KERNEL);
	if (!state)
	return NULL;

	state->config = config;
	state->i2c = i2c;
	state->frontend = fe;
	state->reference = config->refclock / 1000; /* kHz */
	fe->tuner_priv = state;
	fe->ops.tuner_ops = stb6100_ops;

	printk("%s: Attaching STB6100 \n", __func__);
	return fe;
	}

	static void stb6100_release(struct dvb_frontend *fe)
	{
	struct stb6100_state *state = fe->tuner_priv;

	fe->tuner_priv = NULL;
	kfree(state);
	}

	EXPORT_SYMBOL_GPL(stb6100_attach);
	MODULE_PARM_DESC(verbose, "Set Verbosity level");

	MODULE_AUTHOR("Manu Abraham");
	MODULE_DESCRIPTION("STB6100 Silicon tuner");
	MODULE_LICENSE("GPL");