Initial import

1 files changed, 1152 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/cx24123.c b/drivers/media/dvb-frontends/cx24123.c
new file mode 100644
index 000000000..7975c6608
--- /dev/null
+++ b/drivers/media/dvb-frontends/cx24123.c
@@ -0,0 +1,1152 @@
+/*
+ *   Conexant cx24123/cx24109 - DVB QPSK Satellite demod/tuner driver
+ *
+ *   Copyright (C) 2005 Steven Toth <stoth@linuxtv.org>
+ *
+ *   Support for KWorld DVB-S 100 by Vadim Catana <skystar@moldova.cc>
+ *
+ *   Support for CX24123/CX24113-NIM by Patrick Boettcher <pb@linuxtv.org>
+ *
+ *   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/slab.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <asm/div64.h>
+
+#include "dvb_frontend.h"
+#include "cx24123.h"
+
+#define XTAL 10111000
+
+static int force_band;
+module_param(force_band, int, 0644);
+MODULE_PARM_DESC(force_band, "Force a specific band select "\
+	"(1-9, default:off).");
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
+
+#define info(args...) do { printk(KERN_INFO "CX24123: " args); } while (0)
+#define err(args...)  do { printk(KERN_ERR  "CX24123: " args); } while (0)
+
+#define dprintk(args...) \
+	do { \
+		if (debug) { \
+			printk(KERN_DEBUG "CX24123: %s: ", __func__); \
+			printk(args); \
+		} \
+	} while (0)
+
+struct cx24123_state {
+	struct i2c_adapter *i2c;
+	const struct cx24123_config *config;
+
+	struct dvb_frontend frontend;
+
+	/* Some PLL specifics for tuning */
+	u32 VCAarg;
+	u32 VGAarg;
+	u32 bandselectarg;
+	u32 pllarg;
+	u32 FILTune;
+
+	struct i2c_adapter tuner_i2c_adapter;
+
+	u8 demod_rev;
+
+	/* The Demod/Tuner can't easily provide these, we cache them */
+	u32 currentfreq;
+	u32 currentsymbolrate;
+};
+
+/* Various tuner defaults need to be established for a given symbol rate Sps */
+static struct cx24123_AGC_val {
+	u32 symbolrate_low;
+	u32 symbolrate_high;
+	u32 VCAprogdata;
+	u32 VGAprogdata;
+	u32 FILTune;
+} cx24123_AGC_vals[] =
+{
+	{
+		.symbolrate_low		= 1000000,
+		.symbolrate_high	= 4999999,
+		/* the specs recommend other values for VGA offsets,
+		   but tests show they are wrong */
+		.VGAprogdata		= (1 << 19) | (0x180 << 9) | 0x1e0,
+		.VCAprogdata		= (2 << 19) | (0x07 << 9) | 0x07,
+		.FILTune		= 0x27f /* 0.41 V */
+	},
+	{
+		.symbolrate_low		=  5000000,
+		.symbolrate_high	= 14999999,
+		.VGAprogdata		= (1 << 19) | (0x180 << 9) | 0x1e0,
+		.VCAprogdata		= (2 << 19) | (0x07 << 9) | 0x1f,
+		.FILTune		= 0x317 /* 0.90 V */
+	},
+	{
+		.symbolrate_low		= 15000000,
+		.symbolrate_high	= 45000000,
+		.VGAprogdata		= (1 << 19) | (0x100 << 9) | 0x180,
+		.VCAprogdata		= (2 << 19) | (0x07 << 9) | 0x3f,
+		.FILTune		= 0x145 /* 2.70 V */
+	},
+};
+
+/*
+ * Various tuner defaults need to be established for a given frequency kHz.
+ * fixme: The bounds on the bands do not match the doc in real life.
+ * fixme: Some of them have been moved, other might need adjustment.
+ */
+static struct cx24123_bandselect_val {
+	u32 freq_low;
+	u32 freq_high;
+	u32 VCOdivider;
+	u32 progdata;
+} cx24123_bandselect_vals[] =
+{
+	/* band 1 */
+	{
+		.freq_low	= 950000,
+		.freq_high	= 1074999,
+		.VCOdivider	= 4,
+		.progdata	= (0 << 19) | (0 << 9) | 0x40,
+	},
+
+	/* band 2 */
+	{
+		.freq_low	= 1075000,
+		.freq_high	= 1177999,
+		.VCOdivider	= 4,
+		.progdata	= (0 << 19) | (0 << 9) | 0x80,
+	},
+
+	/* band 3 */
+	{
+		.freq_low	= 1178000,
+		.freq_high	= 1295999,
+		.VCOdivider	= 2,
+		.progdata	= (0 << 19) | (1 << 9) | 0x01,
+	},
+
+	/* band 4 */
+	{
+		.freq_low	= 1296000,
+		.freq_high	= 1431999,
+		.VCOdivider	= 2,
+		.progdata	= (0 << 19) | (1 << 9) | 0x02,
+	},
+
+	/* band 5 */
+	{
+		.freq_low	= 1432000,
+		.freq_high	= 1575999,
+		.VCOdivider	= 2,
+		.progdata	= (0 << 19) | (1 << 9) | 0x04,
+	},
+
+	/* band 6 */
+	{
+		.freq_low	= 1576000,
+		.freq_high	= 1717999,
+		.VCOdivider	= 2,
+		.progdata	= (0 << 19) | (1 << 9) | 0x08,
+	},
+
+	/* band 7 */
+	{
+		.freq_low	= 1718000,
+		.freq_high	= 1855999,
+		.VCOdivider	= 2,
+		.progdata	= (0 << 19) | (1 << 9) | 0x10,
+	},
+
+	/* band 8 */
+	{
+		.freq_low	= 1856000,
+		.freq_high	= 2035999,
+		.VCOdivider	= 2,
+		.progdata	= (0 << 19) | (1 << 9) | 0x20,
+	},
+
+	/* band 9 */
+	{
+		.freq_low	= 2036000,
+		.freq_high	= 2150000,
+		.VCOdivider	= 2,
+		.progdata	= (0 << 19) | (1 << 9) | 0x40,
+	},
+};
+
+static struct {
+	u8 reg;
+	u8 data;
+} cx24123_regdata[] =
+{
+	{0x00, 0x03}, /* Reset system */
+	{0x00, 0x00}, /* Clear reset */
+	{0x03, 0x07}, /* QPSK, DVB, Auto Acquisition (default) */
+	{0x04, 0x10}, /* MPEG */
+	{0x05, 0x04}, /* MPEG */
+	{0x06, 0x31}, /* MPEG (default) */
+	{0x0b, 0x00}, /* Freq search start point (default) */
+	{0x0c, 0x00}, /* Demodulator sample gain (default) */
+	{0x0d, 0x7f}, /* Force driver to shift until the maximum (+-10 MHz) */
+	{0x0e, 0x03}, /* Default non-inverted, FEC 3/4 (default) */
+	{0x0f, 0xfe}, /* FEC search mask (all supported codes) */
+	{0x10, 0x01}, /* Default search inversion, no repeat (default) */
+	{0x16, 0x00}, /* Enable reading of frequency */
+	{0x17, 0x01}, /* Enable EsNO Ready Counter */
+	{0x1c, 0x80}, /* Enable error counter */
+	{0x20, 0x00}, /* Tuner burst clock rate = 500KHz */
+	{0x21, 0x15}, /* Tuner burst mode, word length = 0x15 */
+	{0x28, 0x00}, /* Enable FILTERV with positive pol., DiSEqC 2.x off */
+	{0x29, 0x00}, /* DiSEqC LNB_DC off */
+	{0x2a, 0xb0}, /* DiSEqC Parameters (default) */
+	{0x2b, 0x73}, /* DiSEqC Tone Frequency (default) */
+	{0x2c, 0x00}, /* DiSEqC Message (0x2c - 0x31) */
+	{0x2d, 0x00},
+	{0x2e, 0x00},
+	{0x2f, 0x00},
+	{0x30, 0x00},
+	{0x31, 0x00},
+	{0x32, 0x8c}, /* DiSEqC Parameters (default) */
+	{0x33, 0x00}, /* Interrupts off (0x33 - 0x34) */
+	{0x34, 0x00},
+	{0x35, 0x03}, /* DiSEqC Tone Amplitude (default) */
+	{0x36, 0x02}, /* DiSEqC Parameters (default) */
+	{0x37, 0x3a}, /* DiSEqC Parameters (default) */
+	{0x3a, 0x00}, /* Enable AGC accumulator (for signal strength) */
+	{0x44, 0x00}, /* Constellation (default) */
+	{0x45, 0x00}, /* Symbol count (default) */
+	{0x46, 0x0d}, /* Symbol rate estimator on (default) */
+	{0x56, 0xc1}, /* Error Counter = Viterbi BER */
+	{0x57, 0xff}, /* Error Counter Window (default) */
+	{0x5c, 0x20}, /* Acquisition AFC Expiration window (default is 0x10) */
+	{0x67, 0x83}, /* Non-DCII symbol clock */
+};
+
+static int cx24123_i2c_writereg(struct cx24123_state *state,
+	u8 i2c_addr, int reg, int data)
+{
+	u8 buf[] = { reg, data };
+	struct i2c_msg msg = {
+		.addr = i2c_addr, .flags = 0, .buf = buf, .len = 2
+	};
+	int err;
+
+	/* printk(KERN_DEBUG "wr(%02x): %02x %02x\n", i2c_addr, reg, data); */
+
+	err = i2c_transfer(state->i2c, &msg, 1);
+	if (err != 1) {
+		printk("%s: writereg error(err == %i, reg == 0x%02x,"
+			 " data == 0x%02x)\n", __func__, err, reg, data);
+		return err;
+	}
+
+	return 0;
+}
+
+static int cx24123_i2c_readreg(struct cx24123_state *state, u8 i2c_addr, u8 reg)
+{
+	int ret;
+	u8 b = 0;
+	struct i2c_msg msg[] = {
+		{ .addr = i2c_addr, .flags = 0, .buf = &reg, .len = 1 },
+		{ .addr = i2c_addr, .flags = I2C_M_RD, .buf = &b, .len = 1 }
+	};
+
+	ret = i2c_transfer(state->i2c, msg, 2);
+
+	if (ret != 2) {
+		err("%s: reg=0x%x (error=%d)\n", __func__, reg, ret);
+		return ret;
+	}
+
+	/* printk(KERN_DEBUG "rd(%02x): %02x %02x\n", i2c_addr, reg, b); */
+
+	return b;
+}
+
+#define cx24123_readreg(state, reg) \
+	cx24123_i2c_readreg(state, state->config->demod_address, reg)
+#define cx24123_writereg(state, reg, val) \
+	cx24123_i2c_writereg(state, state->config->demod_address, reg, val)
+
+static int cx24123_set_inversion(struct cx24123_state *state,
+	fe_spectral_inversion_t inversion)
+{
+	u8 nom_reg = cx24123_readreg(state, 0x0e);
+	u8 auto_reg = cx24123_readreg(state, 0x10);
+
+	switch (inversion) {
+	case INVERSION_OFF:
+		dprintk("inversion off\n");
+		cx24123_writereg(state, 0x0e, nom_reg & ~0x80);
+		cx24123_writereg(state, 0x10, auto_reg | 0x80);
+		break;
+	case INVERSION_ON:
+		dprintk("inversion on\n");
+		cx24123_writereg(state, 0x0e, nom_reg | 0x80);
+		cx24123_writereg(state, 0x10, auto_reg | 0x80);
+		break;
+	case INVERSION_AUTO:
+		dprintk("inversion auto\n");
+		cx24123_writereg(state, 0x10, auto_reg & ~0x80);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cx24123_get_inversion(struct cx24123_state *state,
+	fe_spectral_inversion_t *inversion)
+{
+	u8 val;
+
+	val = cx24123_readreg(state, 0x1b) >> 7;
+
+	if (val == 0) {
+		dprintk("read inversion off\n");
+		*inversion = INVERSION_OFF;
+	} else {
+		dprintk("read inversion on\n");
+		*inversion = INVERSION_ON;
+	}
+
+	return 0;
+}
+
+static int cx24123_set_fec(struct cx24123_state *state, fe_code_rate_t fec)
+{
+	u8 nom_reg = cx24123_readreg(state, 0x0e) & ~0x07;
+
+	if (((int)fec < FEC_NONE) || (fec > FEC_AUTO))
+		fec = FEC_AUTO;
+
+	/* Set the soft decision threshold */
+	if (fec == FEC_1_2)
+		cx24123_writereg(state, 0x43,
+			cx24123_readreg(state, 0x43) | 0x01);
+	else
+		cx24123_writereg(state, 0x43,
+			cx24123_readreg(state, 0x43) & ~0x01);
+
+	switch (fec) {
+	case FEC_1_2:
+		dprintk("set FEC to 1/2\n");
+		cx24123_writereg(state, 0x0e, nom_reg | 0x01);
+		cx24123_writereg(state, 0x0f, 0x02);
+		break;
+	case FEC_2_3:
+		dprintk("set FEC to 2/3\n");
+		cx24123_writereg(state, 0x0e, nom_reg | 0x02);
+		cx24123_writereg(state, 0x0f, 0x04);
+		break;
+	case FEC_3_4:
+		dprintk("set FEC to 3/4\n");
+		cx24123_writereg(state, 0x0e, nom_reg | 0x03);
+		cx24123_writereg(state, 0x0f, 0x08);
+		break;
+	case FEC_4_5:
+		dprintk("set FEC to 4/5\n");
+		cx24123_writereg(state, 0x0e, nom_reg | 0x04);
+		cx24123_writereg(state, 0x0f, 0x10);
+		break;
+	case FEC_5_6:
+		dprintk("set FEC to 5/6\n");
+		cx24123_writereg(state, 0x0e, nom_reg | 0x05);
+		cx24123_writereg(state, 0x0f, 0x20);
+		break;
+	case FEC_6_7:
+		dprintk("set FEC to 6/7\n");
+		cx24123_writereg(state, 0x0e, nom_reg | 0x06);
+		cx24123_writereg(state, 0x0f, 0x40);
+		break;
+	case FEC_7_8:
+		dprintk("set FEC to 7/8\n");
+		cx24123_writereg(state, 0x0e, nom_reg | 0x07);
+		cx24123_writereg(state, 0x0f, 0x80);
+		break;
+	case FEC_AUTO:
+		dprintk("set FEC to auto\n");
+		cx24123_writereg(state, 0x0f, 0xfe);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int cx24123_get_fec(struct cx24123_state *state, fe_code_rate_t *fec)
+{
+	int ret;
+
+	ret = cx24123_readreg(state, 0x1b);
+	if (ret < 0)
+		return ret;
+	ret = ret & 0x07;
+
+	switch (ret) {
+	case 1:
+		*fec = FEC_1_2;
+		break;
+	case 2:
+		*fec = FEC_2_3;
+		break;
+	case 3:
+		*fec = FEC_3_4;
+		break;
+	case 4:
+		*fec = FEC_4_5;
+		break;
+	case 5:
+		*fec = FEC_5_6;
+		break;
+	case 6:
+		*fec = FEC_6_7;
+		break;
+	case 7:
+		*fec = FEC_7_8;
+		break;
+	default:
+		/* this can happen when there's no lock */
+		*fec = FEC_NONE;
+	}
+
+	return 0;
+}
+
+/* Approximation of closest integer of log2(a/b). It actually gives the
+   lowest integer i such that 2^i >= round(a/b) */
+static u32 cx24123_int_log2(u32 a, u32 b)
+{
+	u32 exp, nearest = 0;
+	u32 div = a / b;
+	if (a % b >= b / 2)
+		++div;
+	if (div < (1 << 31)) {
+		for (exp = 1; div > exp; nearest++)
+			exp += exp;
+	}
+	return nearest;
+}
+
+static int cx24123_set_symbolrate(struct cx24123_state *state, u32 srate)
+{
+	u64 tmp;
+	u32 sample_rate, ratio, sample_gain;
+	u8 pll_mult;
+
+	/*  check if symbol rate is within limits */
+	if ((srate > state->frontend.ops.info.symbol_rate_max) ||
+	    (srate < state->frontend.ops.info.symbol_rate_min))
+		return -EOPNOTSUPP;
+
+	/* choose the sampling rate high enough for the required operation,
+	   while optimizing the power consumed by the demodulator */
+	if (srate < (XTAL*2)/2)
+		pll_mult = 2;
+	else if (srate < (XTAL*3)/2)
+		pll_mult = 3;
+	else if (srate < (XTAL*4)/2)
+		pll_mult = 4;
+	else if (srate < (XTAL*5)/2)
+		pll_mult = 5;
+	else if (srate < (XTAL*6)/2)
+		pll_mult = 6;
+	else if (srate < (XTAL*7)/2)
+		pll_mult = 7;
+	else if (srate < (XTAL*8)/2)
+		pll_mult = 8;
+	else
+		pll_mult = 9;
+
+
+	sample_rate = pll_mult * XTAL;
+
+	/* SYSSymbolRate[21:0] = (srate << 23) / sample_rate */
+
+	tmp = ((u64)srate) << 23;
+	do_div(tmp, sample_rate);
+	ratio = (u32) tmp;
+
+	cx24123_writereg(state, 0x01, pll_mult * 6);
+
+	cx24123_writereg(state, 0x08, (ratio >> 16) & 0x3f);
+	cx24123_writereg(state, 0x09, (ratio >> 8) & 0xff);
+	cx24123_writereg(state, 0x0a, ratio & 0xff);
+
+	/* also set the demodulator sample gain */
+	sample_gain = cx24123_int_log2(sample_rate, srate);
+	tmp = cx24123_readreg(state, 0x0c) & ~0xe0;
+	cx24123_writereg(state, 0x0c, tmp | sample_gain << 5);
+
+	dprintk("srate=%d, ratio=0x%08x, sample_rate=%i sample_gain=%d\n",
+		srate, ratio, sample_rate, sample_gain);
+
+	return 0;
+}
+
+/*
+ * Based on the required frequency and symbolrate, the tuner AGC has
+ * to be configured and the correct band selected.
+ * Calculate those values.
+ */
+static int cx24123_pll_calculate(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	struct cx24123_state *state = fe->demodulator_priv;
+	u32 ndiv = 0, adiv = 0, vco_div = 0;
+	int i = 0;
+	int pump = 2;
+	int band = 0;
+	int num_bands = ARRAY_SIZE(cx24123_bandselect_vals);
+	struct cx24123_bandselect_val *bsv = NULL;
+	struct cx24123_AGC_val *agcv = NULL;
+
+	/* Defaults for low freq, low rate */
+	state->VCAarg = cx24123_AGC_vals[0].VCAprogdata;
+	state->VGAarg = cx24123_AGC_vals[0].VGAprogdata;
+	state->bandselectarg = cx24123_bandselect_vals[0].progdata;
+	vco_div = cx24123_bandselect_vals[0].VCOdivider;
+
+	/* For the given symbol rate, determine the VCA, VGA and
+	 * FILTUNE programming bits */
+	for (i = 0; i < ARRAY_SIZE(cx24123_AGC_vals); i++) {
+		agcv = &cx24123_AGC_vals[i];
+		if ((agcv->symbolrate_low <= p->symbol_rate) &&
+		    (agcv->symbolrate_high >= p->symbol_rate)) {
+			state->VCAarg = agcv->VCAprogdata;
+			state->VGAarg = agcv->VGAprogdata;
+			state->FILTune = agcv->FILTune;
+		}
+	}
+
+	/* determine the band to use */
+	if (force_band < 1 || force_band > num_bands) {
+		for (i = 0; i < num_bands; i++) {
+			bsv = &cx24123_bandselect_vals[i];
+			if ((bsv->freq_low <= p->frequency) &&
+				(bsv->freq_high >= p->frequency))
+				band = i;
+		}
+	} else
+		band = force_band - 1;
+
+	state->bandselectarg = cx24123_bandselect_vals[band].progdata;
+	vco_div = cx24123_bandselect_vals[band].VCOdivider;
+
+	/* determine the charge pump current */
+	if (p->frequency < (cx24123_bandselect_vals[band].freq_low +
+		cx24123_bandselect_vals[band].freq_high) / 2)
+		pump = 0x01;
+	else
+		pump = 0x02;
+
+	/* Determine the N/A dividers for the requested lband freq (in kHz). */
+	/* Note: the reference divider R=10, frequency is in KHz,
+	 * XTAL is in Hz */
+	ndiv = (((p->frequency * vco_div * 10) /
+		(2 * XTAL / 1000)) / 32) & 0x1ff;
+	adiv = (((p->frequency * vco_div * 10) /
+		(2 * XTAL / 1000)) % 32) & 0x1f;
+
+	if (adiv == 0 && ndiv > 0)
+		ndiv--;
+
+	/* control bits 11, refdiv 11, charge pump polarity 1,
+	 * charge pump current, ndiv, adiv */
+	state->pllarg = (3 << 19) | (3 << 17) | (1 << 16) |
+		(pump << 14) | (ndiv << 5) | adiv;
+
+	return 0;
+}
+
+/*
+ * Tuner data is 21 bits long, must be left-aligned in data.
+ * Tuner cx24109 is written through a dedicated 3wire interface
+ * on the demod chip.
+ */
+static int cx24123_pll_writereg(struct dvb_frontend *fe, u32 data)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	unsigned long timeout;
+
+	dprintk("pll writereg called, data=0x%08x\n", data);
+
+	/* align the 21 bytes into to bit23 boundary */
+	data = data << 3;
+
+	/* Reset the demod pll word length to 0x15 bits */
+	cx24123_writereg(state, 0x21, 0x15);
+
+	/* write the msb 8 bits, wait for the send to be completed */
+	timeout = jiffies + msecs_to_jiffies(40);
+	cx24123_writereg(state, 0x22, (data >> 16) & 0xff);
+	while ((cx24123_readreg(state, 0x20) & 0x40) == 0) {
+		if (time_after(jiffies, timeout)) {
+			err("%s:  demodulator is not responding, "\
+				"possibly hung, aborting.\n", __func__);
+			return -EREMOTEIO;
+		}
+		msleep(10);
+	}
+
+	/* send another 8 bytes, wait for the send to be completed */
+	timeout = jiffies + msecs_to_jiffies(40);
+	cx24123_writereg(state, 0x22, (data >> 8) & 0xff);
+	while ((cx24123_readreg(state, 0x20) & 0x40) == 0) {
+		if (time_after(jiffies, timeout)) {
+			err("%s:  demodulator is not responding, "\
+				"possibly hung, aborting.\n", __func__);
+			return -EREMOTEIO;
+		}
+		msleep(10);
+	}
+
+	/* send the lower 5 bits of this byte, padded with 3 LBB,
+	 * wait for the send to be completed */
+	timeout = jiffies + msecs_to_jiffies(40);
+	cx24123_writereg(state, 0x22, (data) & 0xff);
+	while ((cx24123_readreg(state, 0x20) & 0x80)) {
+		if (time_after(jiffies, timeout)) {
+			err("%s:  demodulator is not responding," \
+				"possibly hung, aborting.\n", __func__);
+			return -EREMOTEIO;
+		}
+		msleep(10);
+	}
+
+	/* Trigger the demod to configure the tuner */
+	cx24123_writereg(state, 0x20, cx24123_readreg(state, 0x20) | 2);
+	cx24123_writereg(state, 0x20, cx24123_readreg(state, 0x20) & 0xfd);
+
+	return 0;
+}
+
+static int cx24123_pll_tune(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	struct cx24123_state *state = fe->demodulator_priv;
+	u8 val;
+
+	dprintk("frequency=%i\n", p->frequency);
+
+	if (cx24123_pll_calculate(fe) != 0) {
+		err("%s: cx24123_pll_calcutate failed\n", __func__);
+		return -EINVAL;
+	}
+
+	/* Write the new VCO/VGA */
+	cx24123_pll_writereg(fe, state->VCAarg);
+	cx24123_pll_writereg(fe, state->VGAarg);
+
+	/* Write the new bandselect and pll args */
+	cx24123_pll_writereg(fe, state->bandselectarg);
+	cx24123_pll_writereg(fe, state->pllarg);
+
+	/* set the FILTUNE voltage */
+	val = cx24123_readreg(state, 0x28) & ~0x3;
+	cx24123_writereg(state, 0x27, state->FILTune >> 2);
+	cx24123_writereg(state, 0x28, val | (state->FILTune & 0x3));
+
+	dprintk("pll tune VCA=%d, band=%d, pll=%d\n", state->VCAarg,
+			state->bandselectarg, state->pllarg);
+
+	return 0;
+}
+
+
+/*
+ * 0x23:
+ *    [7:7] = BTI enabled
+ *    [6:6] = I2C repeater enabled
+ *    [5:5] = I2C repeater start
+ *    [0:0] = BTI start
+ */
+
+/* mode == 1 -> i2c-repeater, 0 -> bti */
+static int cx24123_repeater_mode(struct cx24123_state *state, u8 mode, u8 start)
+{
+	u8 r = cx24123_readreg(state, 0x23) & 0x1e;
+	if (mode)
+		r |= (1 << 6) | (start << 5);
+	else
+		r |= (1 << 7) | (start);
+	return cx24123_writereg(state, 0x23, r);
+}
+
+static int cx24123_initfe(struct dvb_frontend *fe)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	int i;
+
+	dprintk("init frontend\n");
+
+	/* Configure the demod to a good set of defaults */
+	for (i = 0; i < ARRAY_SIZE(cx24123_regdata); i++)
+		cx24123_writereg(state, cx24123_regdata[i].reg,
+			cx24123_regdata[i].data);
+
+	/* Set the LNB polarity */
+	if (state->config->lnb_polarity)
+		cx24123_writereg(state, 0x32,
+			cx24123_readreg(state, 0x32) | 0x02);
+
+	if (state->config->dont_use_pll)
+		cx24123_repeater_mode(state, 1, 0);
+
+	return 0;
+}
+
+static int cx24123_set_voltage(struct dvb_frontend *fe,
+	fe_sec_voltage_t voltage)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	u8 val;
+
+	val = cx24123_readreg(state, 0x29) & ~0x40;
+
+	switch (voltage) {
+	case SEC_VOLTAGE_13:
+		dprintk("setting voltage 13V\n");
+		return cx24123_writereg(state, 0x29, val & 0x7f);
+	case SEC_VOLTAGE_18:
+		dprintk("setting voltage 18V\n");
+		return cx24123_writereg(state, 0x29, val | 0x80);
+	case SEC_VOLTAGE_OFF:
+		/* already handled in cx88-dvb */
+		return 0;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* wait for diseqc queue to become ready (or timeout) */
+static void cx24123_wait_for_diseqc(struct cx24123_state *state)
+{
+	unsigned long timeout = jiffies + msecs_to_jiffies(200);
+	while (!(cx24123_readreg(state, 0x29) & 0x40)) {
+		if (time_after(jiffies, timeout)) {
+			err("%s: diseqc queue not ready, " \
+				"command may be lost.\n", __func__);
+			break;
+		}
+		msleep(10);
+	}
+}
+
+static int cx24123_send_diseqc_msg(struct dvb_frontend *fe,
+	struct dvb_diseqc_master_cmd *cmd)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	int i, val, tone;
+
+	dprintk("\n");
+
+	/* stop continuous tone if enabled */
+	tone = cx24123_readreg(state, 0x29);
+	if (tone & 0x10)
+		cx24123_writereg(state, 0x29, tone & ~0x50);
+
+	/* wait for diseqc queue ready */
+	cx24123_wait_for_diseqc(state);
+
+	/* select tone mode */
+	cx24123_writereg(state, 0x2a, cx24123_readreg(state, 0x2a) & 0xfb);
+
+	for (i = 0; i < cmd->msg_len; i++)
+		cx24123_writereg(state, 0x2C + i, cmd->msg[i]);
+
+	val = cx24123_readreg(state, 0x29);
+	cx24123_writereg(state, 0x29, ((val & 0x90) | 0x40) |
+		((cmd->msg_len-3) & 3));
+
+	/* wait for diseqc message to finish sending */
+	cx24123_wait_for_diseqc(state);
+
+	/* restart continuous tone if enabled */
+	if (tone & 0x10)
+		cx24123_writereg(state, 0x29, tone & ~0x40);
+
+	return 0;
+}
+
+static int cx24123_diseqc_send_burst(struct dvb_frontend *fe,
+	fe_sec_mini_cmd_t burst)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	int val, tone;
+
+	dprintk("\n");
+
+	/* stop continuous tone if enabled */
+	tone = cx24123_readreg(state, 0x29);
+	if (tone & 0x10)
+		cx24123_writereg(state, 0x29, tone & ~0x50);
+
+	/* wait for diseqc queue ready */
+	cx24123_wait_for_diseqc(state);
+
+	/* select tone mode */
+	cx24123_writereg(state, 0x2a, cx24123_readreg(state, 0x2a) | 0x4);
+	msleep(30);
+	val = cx24123_readreg(state, 0x29);
+	if (burst == SEC_MINI_A)
+		cx24123_writereg(state, 0x29, ((val & 0x90) | 0x40 | 0x00));
+	else if (burst == SEC_MINI_B)
+		cx24123_writereg(state, 0x29, ((val & 0x90) | 0x40 | 0x08));
+	else
+		return -EINVAL;
+
+	cx24123_wait_for_diseqc(state);
+	cx24123_writereg(state, 0x2a, cx24123_readreg(state, 0x2a) & 0xfb);
+
+	/* restart continuous tone if enabled */
+	if (tone & 0x10)
+		cx24123_writereg(state, 0x29, tone & ~0x40);
+
+	return 0;
+}
+
+static int cx24123_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	int sync = cx24123_readreg(state, 0x14);
+
+	*status = 0;
+	if (state->config->dont_use_pll) {
+		u32 tun_status = 0;
+		if (fe->ops.tuner_ops.get_status)
+			fe->ops.tuner_ops.get_status(fe, &tun_status);
+		if (tun_status & TUNER_STATUS_LOCKED)
+			*status |= FE_HAS_SIGNAL;
+	} else {
+		int lock = cx24123_readreg(state, 0x20);
+		if (lock & 0x01)
+			*status |= FE_HAS_SIGNAL;
+	}
+
+	if (sync & 0x02)
+		*status |= FE_HAS_CARRIER;	/* Phase locked */
+	if (sync & 0x04)
+		*status |= FE_HAS_VITERBI;
+
+	/* Reed-Solomon Status */
+	if (sync & 0x08)
+		*status |= FE_HAS_SYNC;
+	if (sync & 0x80)
+		*status |= FE_HAS_LOCK;		/*Full Sync */
+
+	return 0;
+}
+
+/*
+ * Configured to return the measurement of errors in blocks,
+ * because no UCBLOCKS value is available, so this value doubles up
+ * to satisfy both measurements.
+ */
+static int cx24123_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+
+	/* The true bit error rate is this value divided by
+	   the window size (set as 256 * 255) */
+	*ber = ((cx24123_readreg(state, 0x1c) & 0x3f) << 16) |
+		(cx24123_readreg(state, 0x1d) << 8 |
+		 cx24123_readreg(state, 0x1e));
+
+	dprintk("BER = %d\n", *ber);
+
+	return 0;
+}
+
+static int cx24123_read_signal_strength(struct dvb_frontend *fe,
+	u16 *signal_strength)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+
+	/* larger = better */
+	*signal_strength = cx24123_readreg(state, 0x3b) << 8;
+
+	dprintk("Signal strength = %d\n", *signal_strength);
+
+	return 0;
+}
+
+static int cx24123_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+
+	/* Inverted raw Es/N0 count, totally bogus but better than the
+	   BER threshold. */
+	*snr = 65535 - (((u16)cx24123_readreg(state, 0x18) << 8) |
+			 (u16)cx24123_readreg(state, 0x19));
+
+	dprintk("read S/N index = %d\n", *snr);
+
+	return 0;
+}
+
+static int cx24123_set_frontend(struct dvb_frontend *fe)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+
+	dprintk("\n");
+
+	if (state->config->set_ts_params)
+		state->config->set_ts_params(fe, 0);
+
+	state->currentfreq = p->frequency;
+	state->currentsymbolrate = p->symbol_rate;
+
+	cx24123_set_inversion(state, p->inversion);
+	cx24123_set_fec(state, p->fec_inner);
+	cx24123_set_symbolrate(state, p->symbol_rate);
+
+	if (!state->config->dont_use_pll)
+		cx24123_pll_tune(fe);
+	else if (fe->ops.tuner_ops.set_params)
+		fe->ops.tuner_ops.set_params(fe);
+	else
+		err("it seems I don't have a tuner...");
+
+	/* Enable automatic acquisition and reset cycle */
+	cx24123_writereg(state, 0x03, (cx24123_readreg(state, 0x03) | 0x07));
+	cx24123_writereg(state, 0x00, 0x10);
+	cx24123_writereg(state, 0x00, 0);
+
+	if (state->config->agc_callback)
+		state->config->agc_callback(fe);
+
+	return 0;
+}
+
+static int cx24123_get_frontend(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	struct cx24123_state *state = fe->demodulator_priv;
+
+	dprintk("\n");
+
+	if (cx24123_get_inversion(state, &p->inversion) != 0) {
+		err("%s: Failed to get inversion status\n", __func__);
+		return -EREMOTEIO;
+	}
+	if (cx24123_get_fec(state, &p->fec_inner) != 0) {
+		err("%s: Failed to get fec status\n", __func__);
+		return -EREMOTEIO;
+	}
+	p->frequency = state->currentfreq;
+	p->symbol_rate = state->currentsymbolrate;
+
+	return 0;
+}
+
+static int cx24123_set_tone(struct dvb_frontend *fe, fe_sec_tone_mode_t tone)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	u8 val;
+
+	/* wait for diseqc queue ready */
+	cx24123_wait_for_diseqc(state);
+
+	val = cx24123_readreg(state, 0x29) & ~0x40;
+
+	switch (tone) {
+	case SEC_TONE_ON:
+		dprintk("setting tone on\n");
+		return cx24123_writereg(state, 0x29, val | 0x10);
+	case SEC_TONE_OFF:
+		dprintk("setting tone off\n");
+		return cx24123_writereg(state, 0x29, val & 0xef);
+	default:
+		err("CASE reached default with tone=%d\n", tone);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cx24123_tune(struct dvb_frontend *fe,
+			bool re_tune,
+			unsigned int mode_flags,
+			unsigned int *delay,
+			fe_status_t *status)
+{
+	int retval = 0;
+
+	if (re_tune)
+		retval = cx24123_set_frontend(fe);
+
+	if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
+		cx24123_read_status(fe, status);
+	*delay = HZ/10;
+
+	return retval;
+}
+
+static int cx24123_get_algo(struct dvb_frontend *fe)
+{
+	return 1; /* FE_ALGO_HW */
+}
+
+static void cx24123_release(struct dvb_frontend *fe)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	dprintk("\n");
+	i2c_del_adapter(&state->tuner_i2c_adapter);
+	kfree(state);
+}
+
+static int cx24123_tuner_i2c_tuner_xfer(struct i2c_adapter *i2c_adap,
+	struct i2c_msg msg[], int num)
+{
+	struct cx24123_state *state = i2c_get_adapdata(i2c_adap);
+	/* this repeater closes after the first stop */
+	cx24123_repeater_mode(state, 1, 1);
+	return i2c_transfer(state->i2c, msg, num);
+}
+
+static u32 cx24123_tuner_i2c_func(struct i2c_adapter *adapter)
+{
+	return I2C_FUNC_I2C;
+}
+
+static struct i2c_algorithm cx24123_tuner_i2c_algo = {
+	.master_xfer   = cx24123_tuner_i2c_tuner_xfer,
+	.functionality = cx24123_tuner_i2c_func,
+};
+
+struct i2c_adapter *
+	cx24123_get_tuner_i2c_adapter(struct dvb_frontend *fe)
+{
+	struct cx24123_state *state = fe->demodulator_priv;
+	return &state->tuner_i2c_adapter;
+}
+EXPORT_SYMBOL(cx24123_get_tuner_i2c_adapter);
+
+static struct dvb_frontend_ops cx24123_ops;
+
+struct dvb_frontend *cx24123_attach(const struct cx24123_config *config,
+				    struct i2c_adapter *i2c)
+{
+	/* allocate memory for the internal state */
+	struct cx24123_state *state =
+		kzalloc(sizeof(struct cx24123_state), GFP_KERNEL);
+
+	dprintk("\n");
+	if (state == NULL) {
+		err("Unable to kzalloc\n");
+		goto error;
+	}
+
+	/* setup the state */
+	state->config = config;
+	state->i2c = i2c;
+
+	/* check if the demod is there */
+	state->demod_rev = cx24123_readreg(state, 0x00);
+	switch (state->demod_rev) {
+	case 0xe1:
+		info("detected CX24123C\n");
+		break;
+	case 0xd1:
+		info("detected CX24123\n");
+		break;
+	default:
+		err("wrong demod revision: %x\n", state->demod_rev);
+		goto error;
+	}
+
+	/* create dvb_frontend */
+	memcpy(&state->frontend.ops, &cx24123_ops,
+		sizeof(struct dvb_frontend_ops));
+	state->frontend.demodulator_priv = state;
+
+	/* create tuner i2c adapter */
+	if (config->dont_use_pll)
+		cx24123_repeater_mode(state, 1, 0);
+
+	strlcpy(state->tuner_i2c_adapter.name, "CX24123 tuner I2C bus",
+		sizeof(state->tuner_i2c_adapter.name));
+	state->tuner_i2c_adapter.algo      = &cx24123_tuner_i2c_algo;
+	state->tuner_i2c_adapter.algo_data = NULL;
+	state->tuner_i2c_adapter.dev.parent = i2c->dev.parent;
+	i2c_set_adapdata(&state->tuner_i2c_adapter, state);
+	if (i2c_add_adapter(&state->tuner_i2c_adapter) < 0) {
+		err("tuner i2c bus could not be initialized\n");
+		goto error;
+	}
+
+	return &state->frontend;
+
+error:
+	kfree(state);
+
+	return NULL;
+}
+EXPORT_SYMBOL(cx24123_attach);
+
+static struct dvb_frontend_ops cx24123_ops = {
+	.delsys = { SYS_DVBS },
+	.info = {
+		.name = "Conexant CX24123/CX24109",
+		.frequency_min = 950000,
+		.frequency_max = 2150000,
+		.frequency_stepsize = 1011, /* kHz for QPSK frontends */
+		.frequency_tolerance = 5000,
+		.symbol_rate_min = 1000000,
+		.symbol_rate_max = 45000000,
+		.caps = FE_CAN_INVERSION_AUTO |
+			FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
+			FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
+			FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
+			FE_CAN_QPSK | FE_CAN_RECOVER
+	},
+
+	.release = cx24123_release,
+
+	.init = cx24123_initfe,
+	.set_frontend = cx24123_set_frontend,
+	.get_frontend = cx24123_get_frontend,
+	.read_status = cx24123_read_status,
+	.read_ber = cx24123_read_ber,
+	.read_signal_strength = cx24123_read_signal_strength,
+	.read_snr = cx24123_read_snr,
+	.diseqc_send_master_cmd = cx24123_send_diseqc_msg,
+	.diseqc_send_burst = cx24123_diseqc_send_burst,
+	.set_tone = cx24123_set_tone,
+	.set_voltage = cx24123_set_voltage,
+	.tune = cx24123_tune,
+	.get_frontend_algo = cx24123_get_algo,
+};
+
+MODULE_DESCRIPTION("DVB Frontend module for Conexant " \
+	"CX24123/CX24109/CX24113 hardware");
+MODULE_AUTHOR("Steven Toth");
+MODULE_LICENSE("GPL");
+