drivers/media/dvb/frontends/stb6100.c - kernel/msm-4.9 - Gitiles

 /*
 	STB6100 Silicon Tuner
 	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

 	Copyright (C) ST Microelectronics

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

 #include "dvb_frontend.h"
 #include "stb6100.h"

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


 #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 int 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 },
 };

 static 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
 	};

 	if (state->frontend->ops.i2c_gate_ctrl)
 		if ((rc = state->frontend->ops.i2c_gate_ctrl(state->frontend, 1)) < 0)
 			return rc;

 	rc = i2c_transfer(state->i2c, &msg, 1);
 	if (state->frontend->ops.i2c_gate_ctrl) {
 		int rc2;
 		if ((rc2 = state->frontend->ops.i2c_gate_ctrl(state->frontend, 0)) < 0)
 			return rc2;
 	}
 	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];
 	int rc;

 	if (unlikely(reg >= STB6100_NUMREGS)) {
 		dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
 		return -EINVAL;
 	}
 	if ((rc = stb6100_read_regs(state, regs)) < 0)
 		return rc;
 	return (unsigned int)regs[reg];
 }

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

 	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]);
 	}
 	if (state->frontend->ops.i2c_gate_ctrl)
 		if ((rc = state->frontend->ops.i2c_gate_ctrl(state->frontend, 1)) < 0)
 			return rc;
 	rc = i2c_transfer(state->i2c, &msg, 1);
 	if (state->frontend->ops.i2c_gate_ctrl) {
 		int rc2;
 		if ((rc2 = state->frontend->ops.i2c_gate_ctrl(state->frontend, 0)) < 0)
 			return rc2;
 	}
 	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)
 {
 	if (unlikely(reg >= STB6100_NUMREGS)) {
 		dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
 		return -EREMOTEIO;
 	}
 	data = (data & stb6100_template[reg].mask) | stb6100_template[reg].set;
 	return stb6100_write_reg_range(state, &data, reg, 1);
 }

 static int stb6100_write_regs(struct stb6100_state *state, u8 regs[])
 {
 	stb6100_normalise_regs(regs);
 	return stb6100_write_reg_range(state, &regs[1], 1, STB6100_NUMREGS - 1);
 }

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

 	if ((rc = stb6100_read_reg(state, STB6100_LD)) < 0)
 		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;
 	struct stb6100_state *state = fe->tuner_priv;

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

 	state->status.bandwidth = (f + 5) * 2000;	/* x2 for ZIF	*/

 	*bandwidth = state->bandwidth = state->status.bandwidth * 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 kHz", bandwidth);

 	bandwidth *= 1000 / 2;	/* kHz -> Hz, bw / 2 */

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

 	/* Turn on LPF bandwidth setting clock control,
 	 * set bandwidth, wait 10ms, turn off.
 	 */
 	if ((rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d | STB6100_FCCK_FCCK)) < 0)
 		return rc;
 	if ((rc = stb6100_write_reg(state, STB6100_F, 0xc0 | tmp)) < 0)
 		return rc;
 	msleep(1);
 	if ((rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d)) < 0)
 		return rc;

 	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];

 	if ((rc = stb6100_read_regs(state, regs)) < 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 dvbfe_params params;

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

 	if ((rc = stb6100_read_regs(state, regs)) < 0)
 		return rc;
 	if (fe->ops.get_params) {
 		dprintk(verbose, FE_DEBUG, 1, "Get Frontend parameters");
 		fe->ops.get_params(fe, &params);
 	}
 	switch (params.delivery) {
 	case DVBFE_DELSYS_DVBS:
 		srate = params.delsys.dvbs.symbol_rate;
 		dprintk(verbose, FE_DEBUG, 1, "Delivery system = DVB-S, Symbol Rate=[%d]", srate);
 		break;
 	case DVBFE_DELSYS_DSS:
 		dprintk(verbose, FE_DEBUG, 1, "Delivery system = DSS, Symbol Rate=[%d]", srate);
 		srate = params.delsys.dss.symbol_rate;
 		break;
 	case DVBFE_DELSYS_DVBS2:
 		dprintk(verbose, FE_DEBUG, 1, "Delivery system = DVB-S2, Symbol Rate=[%d]", srate);
 		srate = params.delsys.dvbs2.symbol_rate;
 		break;
 	default:
 		dprintk(verbose, FE_NOTICE, 1, "symbol rate unknown!");
 		srate = 22000000; /* just a typical default value	*/
 	}

 	/* Baseband gain.	*/
 	if (srate >= 15000000)
 		g = 8;
 	else if (state->srate >= 5000000)
 		g = 12;
 	else
 		g = 14;
 	regs[STB6100_G] = (regs[STB6100_G] & ~STB6100_G_G) | g;

 	/* VCO divide ratio (LO divide ratio, VCO prescaler enable).	*/
 	if (frequency <= 1075000)
 		odiv = 1;
 	else
 		odiv = 0;
 	regs[STB6100_VCO] = (regs[STB6100_VCO] & ~STB6100_VCO_ODIV) | (odiv << STB6100_VCO_ODIV_SHIFT);

 	if ((frequency > 1075000) && (frequency <= 1325000))
 		psd2 = 0;
 	else
 		psd2 = 1;
 	regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_PSD2) | (psd2 << STB6100_K_PSD2_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;

 	/* 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 = (((fvco - (nint * state->reference << psd2)) << (9 - psd2)) + state->reference / 2) / state->reference;
 	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);
 	regs[STB6100_NI] = nint;
 	regs[STB6100_NF_LSB] = nfrac;
 	regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_NF_MSB) | ((nfrac >> 8) & STB6100_K_NF_MSB);
 	regs[STB6100_VCO] |= STB6100_VCO_OSCH;		/* VCO search enabled		*/
 	regs[STB6100_VCO] |= STB6100_VCO_OCK;		/* VCO search clock off		*/
 	regs[STB6100_FCCK] |= STB6100_FCCK_FCCK;	/* LPF BW setting clock enabled	*/
 	regs[STB6100_LPEN] &= ~STB6100_LPEN_LPEN;	/* PLL loop disabled		*/
 	/* Power up. */
 	regs[STB6100_LPEN] |= STB6100_LPEN_SYNP	| STB6100_LPEN_OSCP | STB6100_LPEN_BEN;

 	if ((rc = stb6100_write_regs(state, regs)) < 0)
 		return rc;

 	regs[STB6100_LPEN] |= STB6100_LPEN_LPEN;	/* PLL loop enabled		*/
 	if ((rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN])) < 0)
 		return rc;

 	regs[STB6100_VCO] &= ~STB6100_VCO_OCK;		/* VCO fast search		*/
 	if ((rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO])) < 0)
 		return rc;

 	msleep(5);					/* wait for LO to lock		*/
 	regs[STB6100_VCO] &= ~STB6100_VCO_OSCH;		/* vco search disabled		*/
 	regs[STB6100_VCO] |= STB6100_VCO_OCK;		/* search clock off		*/
 	if ((rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO])) < 0)
 		return rc;
 	regs[STB6100_FCCK] &= ~STB6100_FCCK_FCCK;       /* LPF BW clock disabled	*/
 	if ((rc = stb6100_write_reg(state, STB6100_FCCK, regs[STB6100_FCCK])) < 0)
 		return rc;

 	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;
 	struct tuner_state *status = &state->status;

 	status->tunerstep	= 125000;
 	status->ifreq		= 0;
 	status->refclock	= 27000000;	/* Hz	*/
 	status->iqsense		= 1;
 	status->bandwidth	= 36000;	/* kHz	*/
 	state->bandwidth	= status->bandwidth * 1000;	/* MHz	*/
 	state->reference	= status->refclock / 1000;	/* kHz	*/

 	/* Set default bandwidth.	*/
 	return stb6100_set_bandwidth(fe, status->bandwidth);
 }

 static int stb6100_get_state(struct dvb_frontend *fe,
 			     enum tuner_param param,
 			     struct tuner_state *state)
 {
 	switch (param) {
 	case DVBFE_TUNER_FREQUENCY:
 		stb6100_get_frequency(fe, &state->frequency);
 		break;
 	case DVBFE_TUNER_TUNERSTEP:
 		break;
 	case DVBFE_TUNER_IFFREQ:
 		break;
 	case DVBFE_TUNER_BANDWIDTH:
 		stb6100_get_bandwidth(fe, &state->bandwidth);
 		break;
 	case DVBFE_TUNER_REFCLOCK:
 		break;
 	default:
 		break;
 	}

 	return 0;
 }

 static int stb6100_set_state(struct dvb_frontend *fe,
 			     enum tuner_param param,
 			     struct tuner_state *state)
 {
 	struct stb6100_state *tstate = fe->tuner_priv;

 	switch (param) {
 	case DVBFE_TUNER_FREQUENCY:
 		stb6100_set_frequency(fe, state->frequency);
 		state->frequency = tstate->frequency;
 		break;
 	case DVBFE_TUNER_TUNERSTEP:
 		break;
 	case DVBFE_TUNER_IFFREQ:
 		break;
 	case DVBFE_TUNER_BANDWIDTH:
 		stb6100_set_bandwidth(fe, state->bandwidth);
 		state->bandwidth = tstate->bandwidth;
 		break;
 	case DVBFE_TUNER_REFCLOCK:
 		break;
 	default:
 		break;
 	}

 	return 0;
 }

 static struct dvb_tuner_ops stb6100_ops = {
 	.info = {
 		.name			= "STB6100 Silicon Tuner",
 		.frequency_min		= 950000,
 		.frequency_max		= 2150000,
 		.frequency_step		= 0,
 	},

 	.init		= stb6100_init,
 	.sleep          = stb6100_sleep,
 	.get_status	= stb6100_get_status,
 	.get_state	= stb6100_get_state,
 	.set_state	= stb6100_set_state,
 	.get_frequency	= stb6100_get_frequency,
 	.get_bandwidth	= stb6100_get_bandwidth,
 	.release	= stb6100_release
 };

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

 	state = kmalloc(sizeof (struct stb6100_state), GFP_KERNEL);
 	if (state == NULL)
 		goto error;

 	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;

 error:
 	kfree(state);

 	return NULL;
 }

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

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

 	return 0;
 }

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

 MODULE_AUTHOR("Manu Abraham");
 MODULE_DESCRIPTION("STB6100 Silicon tuner");
 MODULE_LICENSE("GPL");
	/*
	STB6100 Silicon Tuner
	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

	Copyright (C) ST Microelectronics

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

	#include "dvb_frontend.h"
	#include "stb6100.h"

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


	#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 int 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 },
	};

	static 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
	};

	if (state->frontend->ops.i2c_gate_ctrl)
	if ((rc = state->frontend->ops.i2c_gate_ctrl(state->frontend, 1)) < 0)
	return rc;

	rc = i2c_transfer(state->i2c, &msg, 1);
	if (state->frontend->ops.i2c_gate_ctrl) {
	int rc2;
	if ((rc2 = state->frontend->ops.i2c_gate_ctrl(state->frontend, 0)) < 0)
	return rc2;
	}
	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];
	int rc;

	if (unlikely(reg >= STB6100_NUMREGS)) {
	dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
	return -EINVAL;
	}
	if ((rc = stb6100_read_regs(state, regs)) < 0)
	return rc;
	return (unsigned int)regs[reg];
	}

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

	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]);
	}
	if (state->frontend->ops.i2c_gate_ctrl)
	if ((rc = state->frontend->ops.i2c_gate_ctrl(state->frontend, 1)) < 0)
	return rc;
	rc = i2c_transfer(state->i2c, &msg, 1);
	if (state->frontend->ops.i2c_gate_ctrl) {
	int rc2;
	if ((rc2 = state->frontend->ops.i2c_gate_ctrl(state->frontend, 0)) < 0)
	return rc2;
	}
	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)
	{
	if (unlikely(reg >= STB6100_NUMREGS)) {
	dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
	return -EREMOTEIO;
	}
	data = (data & stb6100_template[reg].mask) \| stb6100_template[reg].set;
	return stb6100_write_reg_range(state, &data, reg, 1);
	}

	static int stb6100_write_regs(struct stb6100_state *state, u8 regs[])
	{
	stb6100_normalise_regs(regs);
	return stb6100_write_reg_range(state, &regs[1], 1, STB6100_NUMREGS - 1);
	}

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

	if ((rc = stb6100_read_reg(state, STB6100_LD)) < 0)
	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;
	struct stb6100_state *state = fe->tuner_priv;

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

	state->status.bandwidth = (f + 5) * 2000; /* x2 for ZIF */

	bandwidth = state->bandwidth = state->status.bandwidth 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 kHz", bandwidth);

	bandwidth = 1000 / 2; / kHz -> Hz, bw / 2 */

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

	/* Turn on LPF bandwidth setting clock control,
	* set bandwidth, wait 10ms, turn off.
	*/
	if ((rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d \| STB6100_FCCK_FCCK)) < 0)
	return rc;
	if ((rc = stb6100_write_reg(state, STB6100_F, 0xc0 \| tmp)) < 0)
	return rc;
	msleep(1);
	if ((rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d)) < 0)
	return rc;

	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];

	if ((rc = stb6100_read_regs(state, regs)) < 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 dvbfe_params params;

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

	if ((rc = stb6100_read_regs(state, regs)) < 0)
	return rc;
	if (fe->ops.get_params) {
	dprintk(verbose, FE_DEBUG, 1, "Get Frontend parameters");
	fe->ops.get_params(fe, &params);
	}
	switch (params.delivery) {
	case DVBFE_DELSYS_DVBS:
	srate = params.delsys.dvbs.symbol_rate;
	dprintk(verbose, FE_DEBUG, 1, "Delivery system = DVB-S, Symbol Rate=[%d]", srate);
	break;
	case DVBFE_DELSYS_DSS:
	dprintk(verbose, FE_DEBUG, 1, "Delivery system = DSS, Symbol Rate=[%d]", srate);
	srate = params.delsys.dss.symbol_rate;
	break;
	case DVBFE_DELSYS_DVBS2:
	dprintk(verbose, FE_DEBUG, 1, "Delivery system = DVB-S2, Symbol Rate=[%d]", srate);
	srate = params.delsys.dvbs2.symbol_rate;
	break;
	default:
	dprintk(verbose, FE_NOTICE, 1, "symbol rate unknown!");
	srate = 22000000; /* just a typical default value */
	}

	/* Baseband gain. */
	if (srate >= 15000000)
	g = 8;
	else if (state->srate >= 5000000)
	g = 12;
	else
	g = 14;
	regs[STB6100_G] = (regs[STB6100_G] & ~STB6100_G_G) \| g;

	/* VCO divide ratio (LO divide ratio, VCO prescaler enable). */
	if (frequency <= 1075000)
	odiv = 1;
	else
	odiv = 0;
	regs[STB6100_VCO] = (regs[STB6100_VCO] & ~STB6100_VCO_ODIV) \| (odiv << STB6100_VCO_ODIV_SHIFT);

	if ((frequency > 1075000) && (frequency <= 1325000))
	psd2 = 0;
	else
	psd2 = 1;
	regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_PSD2) \| (psd2 << STB6100_K_PSD2_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;

	/* 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 = (((fvco - (nint * state->reference << psd2)) << (9 - psd2)) + state->reference / 2) / state->reference;
	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);
	regs[STB6100_NI] = nint;
	regs[STB6100_NF_LSB] = nfrac;
	regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_NF_MSB) \| ((nfrac >> 8) & STB6100_K_NF_MSB);
	regs[STB6100_VCO] \|= STB6100_VCO_OSCH; /* VCO search enabled */
	regs[STB6100_VCO] \|= STB6100_VCO_OCK; /* VCO search clock off */
	regs[STB6100_FCCK] \|= STB6100_FCCK_FCCK; /* LPF BW setting clock enabled */
	regs[STB6100_LPEN] &= ~STB6100_LPEN_LPEN; /* PLL loop disabled */
	/* Power up. */
	regs[STB6100_LPEN] \|= STB6100_LPEN_SYNP \| STB6100_LPEN_OSCP \| STB6100_LPEN_BEN;

	if ((rc = stb6100_write_regs(state, regs)) < 0)
	return rc;

	regs[STB6100_LPEN] \|= STB6100_LPEN_LPEN; /* PLL loop enabled */
	if ((rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN])) < 0)
	return rc;

	regs[STB6100_VCO] &= ~STB6100_VCO_OCK; /* VCO fast search */
	if ((rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO])) < 0)
	return rc;

	msleep(5); /* wait for LO to lock */
	regs[STB6100_VCO] &= ~STB6100_VCO_OSCH; /* vco search disabled */
	regs[STB6100_VCO] \|= STB6100_VCO_OCK; /* search clock off */
	if ((rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO])) < 0)
	return rc;
	regs[STB6100_FCCK] &= ~STB6100_FCCK_FCCK; /* LPF BW clock disabled */
	if ((rc = stb6100_write_reg(state, STB6100_FCCK, regs[STB6100_FCCK])) < 0)
	return rc;

	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;
	struct tuner_state *status = &state->status;

	status->tunerstep = 125000;
	status->ifreq = 0;
	status->refclock = 27000000; /* Hz */
	status->iqsense = 1;
	status->bandwidth = 36000; /* kHz */
	state->bandwidth = status->bandwidth * 1000; /* MHz */
	state->reference = status->refclock / 1000; /* kHz */

	/* Set default bandwidth. */
	return stb6100_set_bandwidth(fe, status->bandwidth);
	}

	static int stb6100_get_state(struct dvb_frontend *fe,
	enum tuner_param param,
	struct tuner_state *state)
	{
	switch (param) {
	case DVBFE_TUNER_FREQUENCY:
	stb6100_get_frequency(fe, &state->frequency);
	break;
	case DVBFE_TUNER_TUNERSTEP:
	break;
	case DVBFE_TUNER_IFFREQ:
	break;
	case DVBFE_TUNER_BANDWIDTH:
	stb6100_get_bandwidth(fe, &state->bandwidth);
	break;
	case DVBFE_TUNER_REFCLOCK:
	break;
	default:
	break;
	}

	return 0;
	}

	static int stb6100_set_state(struct dvb_frontend *fe,
	enum tuner_param param,
	struct tuner_state *state)
	{
	struct stb6100_state *tstate = fe->tuner_priv;

	switch (param) {
	case DVBFE_TUNER_FREQUENCY:
	stb6100_set_frequency(fe, state->frequency);
	state->frequency = tstate->frequency;
	break;
	case DVBFE_TUNER_TUNERSTEP:
	break;
	case DVBFE_TUNER_IFFREQ:
	break;
	case DVBFE_TUNER_BANDWIDTH:
	stb6100_set_bandwidth(fe, state->bandwidth);
	state->bandwidth = tstate->bandwidth;
	break;
	case DVBFE_TUNER_REFCLOCK:
	break;
	default:
	break;
	}

	return 0;
	}

	static struct dvb_tuner_ops stb6100_ops = {
	.info = {
	.name = "STB6100 Silicon Tuner",
	.frequency_min = 950000,
	.frequency_max = 2150000,
	.frequency_step = 0,
	},

	.init = stb6100_init,
	.sleep = stb6100_sleep,
	.get_status = stb6100_get_status,
	.get_state = stb6100_get_state,
	.set_state = stb6100_set_state,
	.get_frequency = stb6100_get_frequency,
	.get_bandwidth = stb6100_get_bandwidth,
	.release = stb6100_release
	};

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

	state = kmalloc(sizeof (struct stb6100_state), GFP_KERNEL);
	if (state == NULL)
	goto error;

	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;

	error:
	kfree(state);

	return NULL;
	}

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

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

	return 0;
	}

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

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