Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 616 insertions, 0 deletions

diff --git a/kernel/drivers/media/dvb-frontends/stb6100.c b/kernel/drivers/media/dvb-frontends/stb6100.c
new file mode 100644
index 000000000..4ef8a5c70
--- /dev/null
+++ b/kernel/drivers/media/dvb-frontends/stb6100.c
@@ -0,0 +1,616 @@
+/*
+	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/slab.h>
+#include <linux/string.h>
+
+#include "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 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 },
+};
+
+/*
+ * 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)
+{
+	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_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;
+	struct stb6100_state *state = fe->tuner_priv;
+
+	rc = stb6100_read_reg(state, STB6100_F);
+	if (rc < 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 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);
+	}
+	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;
+	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;	/* Hz	*/
+	state->reference	= status->refclock / 1000;	/* kHz	*/
+
+	/* Set default bandwidth. Modified, PN 13-May-10	*/
+	return 0;
+}
+
+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);
+		tstate->frequency = state->frequency;
+		break;
+	case DVBFE_TUNER_TUNERSTEP:
+		break;
+	case DVBFE_TUNER_IFFREQ:
+		break;
+	case DVBFE_TUNER_BANDWIDTH:
+		stb6100_set_bandwidth(fe, state->bandwidth);
+		tstate->bandwidth = state->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,
+	.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 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");