1 files changed, 839 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/mt312.c b/drivers/media/dvb-frontends/mt312.c
new file mode 100644
index 000000000000..e20bf13aa860
--- /dev/null
+++ b/drivers/media/dvb-frontends/mt312.c
@@ -0,0 +1,839 @@
+/*
+    Driver for Zarlink VP310/MT312/ZL10313 Satellite Channel Decoder
+
+    Copyright (C) 2003 Andreas Oberritter <obi@linuxtv.org>
+    Copyright (C) 2008 Matthias Schwarzott <zzam@gentoo.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.
+
+    References:
+    http://products.zarlink.com/product_profiles/MT312.htm
+    http://products.zarlink.com/product_profiles/SL1935.htm
+*/
+
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include "dvb_frontend.h"
+#include "mt312_priv.h"
+#include "mt312.h"
+
+
+struct mt312_state {
+	struct i2c_adapter *i2c;
+	/* configuration settings */
+	const struct mt312_config *config;
+	struct dvb_frontend frontend;
+
+	u8 id;
+	unsigned long xtal;
+	u8 freq_mult;
+};
+
+static int debug;
+#define dprintk(args...) \
+	do { \
+		if (debug) \
+			printk(KERN_DEBUG "mt312: " args); \
+	} while (0)
+
+#define MT312_PLL_CLK		10000000UL	/* 10 MHz */
+#define MT312_PLL_CLK_10_111	10111000UL	/* 10.111 MHz */
+
+static int mt312_read(struct mt312_state *state, const enum mt312_reg_addr reg,
+		      u8 *buf, const size_t count)
+{
+	int ret;
+	struct i2c_msg msg[2];
+	u8 regbuf[1] = { reg };
+
+	msg[0].addr = state->config->demod_address;
+	msg[0].flags = 0;
+	msg[0].buf = regbuf;
+	msg[0].len = 1;
+	msg[1].addr = state->config->demod_address;
+	msg[1].flags = I2C_M_RD;
+	msg[1].buf = buf;
+	msg[1].len = count;
+
+	ret = i2c_transfer(state->i2c, msg, 2);
+
+	if (ret != 2) {
+		printk(KERN_DEBUG "%s: ret == %d\n", __func__, ret);
+		return -EREMOTEIO;
+	}
+
+	if (debug) {
+		int i;
+		dprintk("R(%d):", reg & 0x7f);
+		for (i = 0; i < count; i++)
+			printk(KERN_CONT " %02x", buf[i]);
+		printk("\n");
+	}
+
+	return 0;
+}
+
+static int mt312_write(struct mt312_state *state, const enum mt312_reg_addr reg,
+		       const u8 *src, const size_t count)
+{
+	int ret;
+	u8 buf[count + 1];
+	struct i2c_msg msg;
+
+	if (debug) {
+		int i;
+		dprintk("W(%d):", reg & 0x7f);
+		for (i = 0; i < count; i++)
+			printk(KERN_CONT " %02x", src[i]);
+		printk("\n");
+	}
+
+	buf[0] = reg;
+	memcpy(&buf[1], src, count);
+
+	msg.addr = state->config->demod_address;
+	msg.flags = 0;
+	msg.buf = buf;
+	msg.len = count + 1;
+
+	ret = i2c_transfer(state->i2c, &msg, 1);
+
+	if (ret != 1) {
+		dprintk("%s: ret == %d\n", __func__, ret);
+		return -EREMOTEIO;
+	}
+
+	return 0;
+}
+
+static inline int mt312_readreg(struct mt312_state *state,
+				const enum mt312_reg_addr reg, u8 *val)
+{
+	return mt312_read(state, reg, val, 1);
+}
+
+static inline int mt312_writereg(struct mt312_state *state,
+				 const enum mt312_reg_addr reg, const u8 val)
+{
+	return mt312_write(state, reg, &val, 1);
+}
+
+static inline u32 mt312_div(u32 a, u32 b)
+{
+	return (a + (b / 2)) / b;
+}
+
+static int mt312_reset(struct mt312_state *state, const u8 full)
+{
+	return mt312_writereg(state, RESET, full ? 0x80 : 0x40);
+}
+
+static int mt312_get_inversion(struct mt312_state *state,
+			       fe_spectral_inversion_t *i)
+{
+	int ret;
+	u8 vit_mode;
+
+	ret = mt312_readreg(state, VIT_MODE, &vit_mode);
+	if (ret < 0)
+		return ret;
+
+	if (vit_mode & 0x80)	/* auto inversion was used */
+		*i = (vit_mode & 0x40) ? INVERSION_ON : INVERSION_OFF;
+
+	return 0;
+}
+
+static int mt312_get_symbol_rate(struct mt312_state *state, u32 *sr)
+{
+	int ret;
+	u8 sym_rate_h;
+	u8 dec_ratio;
+	u16 sym_rat_op;
+	u16 monitor;
+	u8 buf[2];
+
+	ret = mt312_readreg(state, SYM_RATE_H, &sym_rate_h);
+	if (ret < 0)
+		return ret;
+
+	if (sym_rate_h & 0x80) {
+		/* symbol rate search was used */
+		ret = mt312_writereg(state, MON_CTRL, 0x03);
+		if (ret < 0)
+			return ret;
+
+		ret = mt312_read(state, MONITOR_H, buf, sizeof(buf));
+		if (ret < 0)
+			return ret;
+
+		monitor = (buf[0] << 8) | buf[1];
+
+		dprintk("sr(auto) = %u\n",
+		       mt312_div(monitor * 15625, 4));
+	} else {
+		ret = mt312_writereg(state, MON_CTRL, 0x05);
+		if (ret < 0)
+			return ret;
+
+		ret = mt312_read(state, MONITOR_H, buf, sizeof(buf));
+		if (ret < 0)
+			return ret;
+
+		dec_ratio = ((buf[0] >> 5) & 0x07) * 32;
+
+		ret = mt312_read(state, SYM_RAT_OP_H, buf, sizeof(buf));
+		if (ret < 0)
+			return ret;
+
+		sym_rat_op = (buf[0] << 8) | buf[1];
+
+		dprintk("sym_rat_op=%d dec_ratio=%d\n",
+		       sym_rat_op, dec_ratio);
+		dprintk("*sr(manual) = %lu\n",
+		       (((state->xtal * 8192) / (sym_rat_op + 8192)) *
+			2) - dec_ratio);
+	}
+
+	return 0;
+}
+
+static int mt312_get_code_rate(struct mt312_state *state, fe_code_rate_t *cr)
+{
+	const fe_code_rate_t fec_tab[8] =
+	    { FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_6_7, FEC_7_8,
+		FEC_AUTO, FEC_AUTO };
+
+	int ret;
+	u8 fec_status;
+
+	ret = mt312_readreg(state, FEC_STATUS, &fec_status);
+	if (ret < 0)
+		return ret;
+
+	*cr = fec_tab[(fec_status >> 4) & 0x07];
+
+	return 0;
+}
+
+static int mt312_initfe(struct dvb_frontend *fe)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+	u8 buf[2];
+
+	/* wake up */
+	ret = mt312_writereg(state, CONFIG,
+			(state->freq_mult == 6 ? 0x88 : 0x8c));
+	if (ret < 0)
+		return ret;
+
+	/* wait at least 150 usec */
+	udelay(150);
+
+	/* full reset */
+	ret = mt312_reset(state, 1);
+	if (ret < 0)
+		return ret;
+
+/* Per datasheet, write correct values. 09/28/03 ACCJr.
+ * If we don't do this, we won't get FE_HAS_VITERBI in the VP310. */
+	{
+		u8 buf_def[8] = { 0x14, 0x12, 0x03, 0x02,
+				  0x01, 0x00, 0x00, 0x00 };
+
+		ret = mt312_write(state, VIT_SETUP, buf_def, sizeof(buf_def));
+		if (ret < 0)
+			return ret;
+	}
+
+	switch (state->id) {
+	case ID_ZL10313:
+		/* enable ADC */
+		ret = mt312_writereg(state, GPP_CTRL, 0x80);
+		if (ret < 0)
+			return ret;
+
+		/* configure ZL10313 for optimal ADC performance */
+		buf[0] = 0x80;
+		buf[1] = 0xB0;
+		ret = mt312_write(state, HW_CTRL, buf, 2);
+		if (ret < 0)
+			return ret;
+
+		/* enable MPEG output and ADCs */
+		ret = mt312_writereg(state, HW_CTRL, 0x00);
+		if (ret < 0)
+			return ret;
+
+		ret = mt312_writereg(state, MPEG_CTRL, 0x00);
+		if (ret < 0)
+			return ret;
+
+		break;
+	}
+
+	/* SYS_CLK */
+	buf[0] = mt312_div(state->xtal * state->freq_mult * 2, 1000000);
+
+	/* DISEQC_RATIO */
+	buf[1] = mt312_div(state->xtal, 22000 * 4);
+
+	ret = mt312_write(state, SYS_CLK, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	ret = mt312_writereg(state, SNR_THS_HIGH, 0x32);
+	if (ret < 0)
+		return ret;
+
+	/* different MOCLK polarity */
+	switch (state->id) {
+	case ID_ZL10313:
+		buf[0] = 0x33;
+		break;
+	default:
+		buf[0] = 0x53;
+		break;
+	}
+
+	ret = mt312_writereg(state, OP_CTRL, buf[0]);
+	if (ret < 0)
+		return ret;
+
+	/* TS_SW_LIM */
+	buf[0] = 0x8c;
+	buf[1] = 0x98;
+
+	ret = mt312_write(state, TS_SW_LIM_L, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	ret = mt312_writereg(state, CS_SW_LIM, 0x69);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int mt312_send_master_cmd(struct dvb_frontend *fe,
+				 struct dvb_diseqc_master_cmd *c)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+	u8 diseqc_mode;
+
+	if ((c->msg_len == 0) || (c->msg_len > sizeof(c->msg)))
+		return -EINVAL;
+
+	ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode);
+	if (ret < 0)
+		return ret;
+
+	ret = mt312_write(state, (0x80 | DISEQC_INSTR), c->msg, c->msg_len);
+	if (ret < 0)
+		return ret;
+
+	ret = mt312_writereg(state, DISEQC_MODE,
+			     (diseqc_mode & 0x40) | ((c->msg_len - 1) << 3)
+			     | 0x04);
+	if (ret < 0)
+		return ret;
+
+	/* is there a better way to wait for message to be transmitted */
+	msleep(100);
+
+	/* set DISEQC_MODE[2:0] to zero if a return message is expected */
+	if (c->msg[0] & 0x02) {
+		ret = mt312_writereg(state, DISEQC_MODE, (diseqc_mode & 0x40));
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int mt312_send_burst(struct dvb_frontend *fe, const fe_sec_mini_cmd_t c)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	const u8 mini_tab[2] = { 0x02, 0x03 };
+
+	int ret;
+	u8 diseqc_mode;
+
+	if (c > SEC_MINI_B)
+		return -EINVAL;
+
+	ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode);
+	if (ret < 0)
+		return ret;
+
+	ret = mt312_writereg(state, DISEQC_MODE,
+			     (diseqc_mode & 0x40) | mini_tab[c]);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int mt312_set_tone(struct dvb_frontend *fe, const fe_sec_tone_mode_t t)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	const u8 tone_tab[2] = { 0x01, 0x00 };
+
+	int ret;
+	u8 diseqc_mode;
+
+	if (t > SEC_TONE_OFF)
+		return -EINVAL;
+
+	ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode);
+	if (ret < 0)
+		return ret;
+
+	ret = mt312_writereg(state, DISEQC_MODE,
+			     (diseqc_mode & 0x40) | tone_tab[t]);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int mt312_set_voltage(struct dvb_frontend *fe, const fe_sec_voltage_t v)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	const u8 volt_tab[3] = { 0x00, 0x40, 0x00 };
+	u8 val;
+
+	if (v > SEC_VOLTAGE_OFF)
+		return -EINVAL;
+
+	val = volt_tab[v];
+	if (state->config->voltage_inverted)
+		val ^= 0x40;
+
+	return mt312_writereg(state, DISEQC_MODE, val);
+}
+
+static int mt312_read_status(struct dvb_frontend *fe, fe_status_t *s)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+	u8 status[3];
+
+	*s = 0;
+
+	ret = mt312_read(state, QPSK_STAT_H, status, sizeof(status));
+	if (ret < 0)
+		return ret;
+
+	dprintk("QPSK_STAT_H: 0x%02x, QPSK_STAT_L: 0x%02x,"
+		" FEC_STATUS: 0x%02x\n", status[0], status[1], status[2]);
+
+	if (status[0] & 0xc0)
+		*s |= FE_HAS_SIGNAL;	/* signal noise ratio */
+	if (status[0] & 0x04)
+		*s |= FE_HAS_CARRIER;	/* qpsk carrier lock */
+	if (status[2] & 0x02)
+		*s |= FE_HAS_VITERBI;	/* viterbi lock */
+	if (status[2] & 0x04)
+		*s |= FE_HAS_SYNC;	/* byte align lock */
+	if (status[0] & 0x01)
+		*s |= FE_HAS_LOCK;	/* qpsk lock */
+
+	return 0;
+}
+
+static int mt312_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+	u8 buf[3];
+
+	ret = mt312_read(state, RS_BERCNT_H, buf, 3);
+	if (ret < 0)
+		return ret;
+
+	*ber = ((buf[0] << 16) | (buf[1] << 8) | buf[2]) * 64;
+
+	return 0;
+}
+
+static int mt312_read_signal_strength(struct dvb_frontend *fe,
+				      u16 *signal_strength)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+	u8 buf[3];
+	u16 agc;
+	s16 err_db;
+
+	ret = mt312_read(state, AGC_H, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	agc = (buf[0] << 6) | (buf[1] >> 2);
+	err_db = (s16) (((buf[1] & 0x03) << 14) | buf[2] << 6) >> 6;
+
+	*signal_strength = agc;
+
+	dprintk("agc=%08x err_db=%hd\n", agc, err_db);
+
+	return 0;
+}
+
+static int mt312_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+	u8 buf[2];
+
+	ret = mt312_read(state, M_SNR_H, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	*snr = 0xFFFF - ((((buf[0] & 0x7f) << 8) | buf[1]) << 1);
+
+	return 0;
+}
+
+static int mt312_read_ucblocks(struct dvb_frontend *fe, u32 *ubc)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+	u8 buf[2];
+
+	ret = mt312_read(state, RS_UBC_H, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	*ubc = (buf[0] << 8) | buf[1];
+
+	return 0;
+}
+
+static int mt312_set_frontend(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+	u8 buf[5], config_val;
+	u16 sr;
+
+	const u8 fec_tab[10] =
+	    { 0x00, 0x01, 0x02, 0x04, 0x3f, 0x08, 0x10, 0x20, 0x3f, 0x3f };
+	const u8 inv_tab[3] = { 0x00, 0x40, 0x80 };
+
+	dprintk("%s: Freq %d\n", __func__, p->frequency);
+
+	if ((p->frequency < fe->ops.info.frequency_min)
+	    || (p->frequency > fe->ops.info.frequency_max))
+		return -EINVAL;
+
+	if ((p->inversion < INVERSION_OFF)
+	    || (p->inversion > INVERSION_ON))
+		return -EINVAL;
+
+	if ((p->symbol_rate < fe->ops.info.symbol_rate_min)
+	    || (p->symbol_rate > fe->ops.info.symbol_rate_max))
+		return -EINVAL;
+
+	if ((p->fec_inner < FEC_NONE)
+	    || (p->fec_inner > FEC_AUTO))
+		return -EINVAL;
+
+	if ((p->fec_inner == FEC_4_5)
+	    || (p->fec_inner == FEC_8_9))
+		return -EINVAL;
+
+	switch (state->id) {
+	case ID_VP310:
+	/* For now we will do this only for the VP310.
+	 * It should be better for the mt312 as well,
+	 * but tuning will be slower. ACCJr 09/29/03
+	 */
+		ret = mt312_readreg(state, CONFIG, &config_val);
+		if (ret < 0)
+			return ret;
+		if (p->symbol_rate >= 30000000) {
+			/* Note that 30MS/s should use 90MHz */
+			if (state->freq_mult == 6) {
+				/* We are running 60MHz */
+				state->freq_mult = 9;
+				ret = mt312_initfe(fe);
+				if (ret < 0)
+					return ret;
+			}
+		} else {
+			if (state->freq_mult == 9) {
+				/* We are running 90MHz */
+				state->freq_mult = 6;
+				ret = mt312_initfe(fe);
+				if (ret < 0)
+					return ret;
+			}
+		}
+		break;
+
+	case ID_MT312:
+	case ID_ZL10313:
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	if (fe->ops.tuner_ops.set_params) {
+		fe->ops.tuner_ops.set_params(fe);
+		if (fe->ops.i2c_gate_ctrl)
+			fe->ops.i2c_gate_ctrl(fe, 0);
+	}
+
+	/* sr = (u16)(sr * 256.0 / 1000000.0) */
+	sr = mt312_div(p->symbol_rate * 4, 15625);
+
+	/* SYM_RATE */
+	buf[0] = (sr >> 8) & 0x3f;
+	buf[1] = (sr >> 0) & 0xff;
+
+	/* VIT_MODE */
+	buf[2] = inv_tab[p->inversion] | fec_tab[p->fec_inner];
+
+	/* QPSK_CTRL */
+	buf[3] = 0x40;		/* swap I and Q before QPSK demodulation */
+
+	if (p->symbol_rate < 10000000)
+		buf[3] |= 0x04;	/* use afc mode */
+
+	/* GO */
+	buf[4] = 0x01;
+
+	ret = mt312_write(state, SYM_RATE_H, buf, sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	mt312_reset(state, 0);
+
+	return 0;
+}
+
+static int mt312_get_frontend(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+
+	ret = mt312_get_inversion(state, &p->inversion);
+	if (ret < 0)
+		return ret;
+
+	ret = mt312_get_symbol_rate(state, &p->symbol_rate);
+	if (ret < 0)
+		return ret;
+
+	ret = mt312_get_code_rate(state, &p->fec_inner);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int mt312_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+
+	u8 val = 0x00;
+	int ret;
+
+	switch (state->id) {
+	case ID_ZL10313:
+		ret = mt312_readreg(state, GPP_CTRL, &val);
+		if (ret < 0)
+			goto error;
+
+		/* preserve this bit to not accidentally shutdown ADC */
+		val &= 0x80;
+		break;
+	}
+
+	if (enable)
+		val |= 0x40;
+	else
+		val &= ~0x40;
+
+	ret = mt312_writereg(state, GPP_CTRL, val);
+
+error:
+	return ret;
+}
+
+static int mt312_sleep(struct dvb_frontend *fe)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	int ret;
+	u8 config;
+
+	/* reset all registers to defaults */
+	ret = mt312_reset(state, 1);
+	if (ret < 0)
+		return ret;
+
+	if (state->id == ID_ZL10313) {
+		/* reset ADC */
+		ret = mt312_writereg(state, GPP_CTRL, 0x00);
+		if (ret < 0)
+			return ret;
+
+		/* full shutdown of ADCs, mpeg bus tristated */
+		ret = mt312_writereg(state, HW_CTRL, 0x0d);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = mt312_readreg(state, CONFIG, &config);
+	if (ret < 0)
+		return ret;
+
+	/* enter standby */
+	ret = mt312_writereg(state, CONFIG, config & 0x7f);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int mt312_get_tune_settings(struct dvb_frontend *fe,
+		struct dvb_frontend_tune_settings *fesettings)
+{
+	fesettings->min_delay_ms = 50;
+	fesettings->step_size = 0;
+	fesettings->max_drift = 0;
+	return 0;
+}
+
+static void mt312_release(struct dvb_frontend *fe)
+{
+	struct mt312_state *state = fe->demodulator_priv;
+	kfree(state);
+}
+
+#define MT312_SYS_CLK		90000000UL	/* 90 MHz */
+static struct dvb_frontend_ops mt312_ops = {
+	.delsys = { SYS_DVBS },
+	.info = {
+		.name = "Zarlink ???? DVB-S",
+		.frequency_min = 950000,
+		.frequency_max = 2150000,
+		/* FIXME: adjust freq to real used xtal */
+		.frequency_stepsize = (MT312_PLL_CLK / 1000) / 128,
+		.symbol_rate_min = MT312_SYS_CLK / 128, /* FIXME as above */
+		.symbol_rate_max = MT312_SYS_CLK / 2,
+		.caps =
+		    FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
+		    FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
+		    FE_CAN_FEC_AUTO | FE_CAN_QPSK | FE_CAN_MUTE_TS |
+		    FE_CAN_RECOVER
+	},
+
+	.release = mt312_release,
+
+	.init = mt312_initfe,
+	.sleep = mt312_sleep,
+	.i2c_gate_ctrl = mt312_i2c_gate_ctrl,
+
+	.set_frontend = mt312_set_frontend,
+	.get_frontend = mt312_get_frontend,
+	.get_tune_settings = mt312_get_tune_settings,
+
+	.read_status = mt312_read_status,
+	.read_ber = mt312_read_ber,
+	.read_signal_strength = mt312_read_signal_strength,
+	.read_snr = mt312_read_snr,
+	.read_ucblocks = mt312_read_ucblocks,
+
+	.diseqc_send_master_cmd = mt312_send_master_cmd,
+	.diseqc_send_burst = mt312_send_burst,
+	.set_tone = mt312_set_tone,
+	.set_voltage = mt312_set_voltage,
+};
+
+struct dvb_frontend *mt312_attach(const struct mt312_config *config,
+					struct i2c_adapter *i2c)
+{
+	struct mt312_state *state = NULL;
+
+	/* allocate memory for the internal state */
+	state = kzalloc(sizeof(struct mt312_state), GFP_KERNEL);
+	if (state == NULL)
+		goto error;
+
+	/* setup the state */
+	state->config = config;
+	state->i2c = i2c;
+
+	/* check if the demod is there */
+	if (mt312_readreg(state, ID, &state->id) < 0)
+		goto error;
+
+	/* create dvb_frontend */
+	memcpy(&state->frontend.ops, &mt312_ops,
+		sizeof(struct dvb_frontend_ops));
+	state->frontend.demodulator_priv = state;
+
+	switch (state->id) {
+	case ID_VP310:
+		strcpy(state->frontend.ops.info.name, "Zarlink VP310 DVB-S");
+		state->xtal = MT312_PLL_CLK;
+		state->freq_mult = 9;
+		break;
+	case ID_MT312:
+		strcpy(state->frontend.ops.info.name, "Zarlink MT312 DVB-S");
+		state->xtal = MT312_PLL_CLK;
+		state->freq_mult = 6;
+		break;
+	case ID_ZL10313:
+		strcpy(state->frontend.ops.info.name, "Zarlink ZL10313 DVB-S");
+		state->xtal = MT312_PLL_CLK_10_111;
+		state->freq_mult = 9;
+		break;
+	default:
+		printk(KERN_WARNING "Only Zarlink VP310/MT312/ZL10313"
+			" are supported chips.\n");
+		goto error;
+	}
+
+	return &state->frontend;
+
+error:
+	kfree(state);
+	return NULL;
+}
+EXPORT_SYMBOL(mt312_attach);
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+MODULE_DESCRIPTION("Zarlink VP310/MT312/ZL10313 DVB-S Demodulator driver");
+MODULE_AUTHOR("Andreas Oberritter <obi@linuxtv.org>");
+MODULE_AUTHOR("Matthias Schwarzott <zzam@gentoo.org>");
+MODULE_LICENSE("GPL");
+