Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1051 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/lgs8gxx.c b/drivers/media/dvb-frontends/lgs8gxx.c
new file mode 100644
index 000000000..ffaf60e16
--- /dev/null
+++ b/drivers/media/dvb-frontends/lgs8gxx.c
@@ -0,0 +1,1051 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *    Support for Legend Silicon GB20600 (a.k.a DMB-TH) demodulator
+ *    LGS8913, LGS8GL5, LGS8G75
+ *    experimental support LGS8G42, LGS8G52
+ *
+ *    Copyright (C) 2007-2009 David T.L. Wong <davidtlwong@gmail.com>
+ *    Copyright (C) 2008 Sirius International (Hong Kong) Limited
+ *    Timothy Lee <timothy.lee@siriushk.com> (for initial work on LGS8GL5)
+ */
+
+#include <asm/div64.h>
+#include <linux/firmware.h>
+
+#include <media/dvb_frontend.h>
+
+#include "lgs8gxx.h"
+#include "lgs8gxx_priv.h"
+
+#define dprintk(args...) \
+	do { \
+		if (debug) \
+			printk(KERN_DEBUG "lgs8gxx: " args); \
+	} while (0)
+
+static int debug;
+static int fake_signal_str = 1;
+
+#define LGS8GXX_FIRMWARE "lgs8g75.fw"
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+module_param(fake_signal_str, int, 0644);
+MODULE_PARM_DESC(fake_signal_str, "fake signal strength for LGS8913."
+"Signal strength calculation is slow.(default:on).");
+
+/* LGS8GXX internal helper functions */
+
+static int lgs8gxx_write_reg(struct lgs8gxx_state *priv, u8 reg, u8 data)
+{
+	int ret;
+	u8 buf[] = { reg, data };
+	struct i2c_msg msg = { .flags = 0, .buf = buf, .len = 2 };
+
+	msg.addr = priv->config->demod_address;
+	if (priv->config->prod != LGS8GXX_PROD_LGS8G75 && reg >= 0xC0)
+		msg.addr += 0x02;
+
+	if (debug >= 2)
+		dprintk("%s: reg=0x%02X, data=0x%02X\n", __func__, reg, data);
+
+	ret = i2c_transfer(priv->i2c, &msg, 1);
+
+	if (ret != 1)
+		dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",
+			__func__, reg, data, ret);
+
+	return (ret != 1) ? -1 : 0;
+}
+
+static int lgs8gxx_read_reg(struct lgs8gxx_state *priv, u8 reg, u8 *p_data)
+{
+	int ret;
+	u8 dev_addr;
+
+	u8 b0[] = { reg };
+	u8 b1[] = { 0 };
+	struct i2c_msg msg[] = {
+		{ .flags = 0, .buf = b0, .len = 1 },
+		{ .flags = I2C_M_RD, .buf = b1, .len = 1 },
+	};
+
+	dev_addr = priv->config->demod_address;
+	if (priv->config->prod != LGS8GXX_PROD_LGS8G75 && reg >= 0xC0)
+		dev_addr += 0x02;
+	msg[1].addr =  msg[0].addr = dev_addr;
+
+	ret = i2c_transfer(priv->i2c, msg, 2);
+	if (ret != 2) {
+		dprintk("%s: error reg=0x%x, ret=%i\n", __func__, reg, ret);
+		return -1;
+	}
+
+	*p_data = b1[0];
+	if (debug >= 2)
+		dprintk("%s: reg=0x%02X, data=0x%02X\n", __func__, reg, b1[0]);
+	return 0;
+}
+
+static int lgs8gxx_soft_reset(struct lgs8gxx_state *priv)
+{
+	lgs8gxx_write_reg(priv, 0x02, 0x00);
+	msleep(1);
+	lgs8gxx_write_reg(priv, 0x02, 0x01);
+	msleep(100);
+
+	return 0;
+}
+
+static int wait_reg_mask(struct lgs8gxx_state *priv, u8 reg, u8 mask,
+	u8 val, u8 delay, u8 tries)
+{
+	u8 t;
+	int i;
+
+	for (i = 0; i < tries; i++) {
+		lgs8gxx_read_reg(priv, reg, &t);
+
+		if ((t & mask) == val)
+			return 0;
+		msleep(delay);
+	}
+
+	return 1;
+}
+
+static int lgs8gxx_set_ad_mode(struct lgs8gxx_state *priv)
+{
+	const struct lgs8gxx_config *config = priv->config;
+	u8 if_conf;
+
+	if_conf = 0x10; /* AGC output on, RF_AGC output off; */
+
+	if_conf |=
+		((config->ext_adc) ? 0x80 : 0x00) |
+		((config->if_neg_center) ? 0x04 : 0x00) |
+		((config->if_freq == 0) ? 0x08 : 0x00) | /* Baseband */
+		((config->adc_signed) ? 0x02 : 0x00) |
+		((config->if_neg_edge) ? 0x01 : 0x00);
+
+	if (config->ext_adc &&
+		(config->prod == LGS8GXX_PROD_LGS8G52)) {
+		lgs8gxx_write_reg(priv, 0xBA, 0x40);
+	}
+
+	lgs8gxx_write_reg(priv, 0x07, if_conf);
+
+	return 0;
+}
+
+static int lgs8gxx_set_if_freq(struct lgs8gxx_state *priv, u32 freq /*in kHz*/)
+{
+	u64 val;
+	u32 v32;
+	u32 if_clk;
+
+	if_clk = priv->config->if_clk_freq;
+
+	val = freq;
+	if (freq != 0) {
+		val <<= 32;
+		if (if_clk != 0)
+			do_div(val, if_clk);
+		v32 = val & 0xFFFFFFFF;
+		dprintk("Set IF Freq to %dkHz\n", freq);
+	} else {
+		v32 = 0;
+		dprintk("Set IF Freq to baseband\n");
+	}
+	dprintk("AFC_INIT_FREQ = 0x%08X\n", v32);
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		lgs8gxx_write_reg(priv, 0x08, 0xFF & (v32));
+		lgs8gxx_write_reg(priv, 0x09, 0xFF & (v32 >> 8));
+		lgs8gxx_write_reg(priv, 0x0A, 0xFF & (v32 >> 16));
+		lgs8gxx_write_reg(priv, 0x0B, 0xFF & (v32 >> 24));
+	} else {
+		lgs8gxx_write_reg(priv, 0x09, 0xFF & (v32));
+		lgs8gxx_write_reg(priv, 0x0A, 0xFF & (v32 >> 8));
+		lgs8gxx_write_reg(priv, 0x0B, 0xFF & (v32 >> 16));
+		lgs8gxx_write_reg(priv, 0x0C, 0xFF & (v32 >> 24));
+	}
+
+	return 0;
+}
+
+static int lgs8gxx_get_afc_phase(struct lgs8gxx_state *priv)
+{
+	u64 val;
+	u32 v32 = 0;
+	u8 reg_addr, t;
+	int i;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
+		reg_addr = 0x23;
+	else
+		reg_addr = 0x48;
+
+	for (i = 0; i < 4; i++) {
+		lgs8gxx_read_reg(priv, reg_addr, &t);
+		v32 <<= 8;
+		v32 |= t;
+		reg_addr--;
+	}
+
+	val = v32;
+	val *= priv->config->if_clk_freq;
+	val >>= 32;
+	dprintk("AFC = %u kHz\n", (u32)val);
+	return 0;
+}
+
+static int lgs8gxx_set_mode_auto(struct lgs8gxx_state *priv)
+{
+	u8 t;
+	u8 prod = priv->config->prod;
+
+	if (prod == LGS8GXX_PROD_LGS8913)
+		lgs8gxx_write_reg(priv, 0xC6, 0x01);
+
+	if (prod == LGS8GXX_PROD_LGS8G75) {
+		lgs8gxx_read_reg(priv, 0x0C, &t);
+		t &= (~0x04);
+		lgs8gxx_write_reg(priv, 0x0C, t | 0x80);
+		lgs8gxx_write_reg(priv, 0x39, 0x00);
+		lgs8gxx_write_reg(priv, 0x3D, 0x04);
+	} else if (prod == LGS8GXX_PROD_LGS8913 ||
+		prod == LGS8GXX_PROD_LGS8GL5 ||
+		prod == LGS8GXX_PROD_LGS8G42 ||
+		prod == LGS8GXX_PROD_LGS8G52 ||
+		prod == LGS8GXX_PROD_LGS8G54) {
+		lgs8gxx_read_reg(priv, 0x7E, &t);
+		lgs8gxx_write_reg(priv, 0x7E, t | 0x01);
+
+		/* clear FEC self reset */
+		lgs8gxx_read_reg(priv, 0xC5, &t);
+		lgs8gxx_write_reg(priv, 0xC5, t & 0xE0);
+	}
+
+	if (prod == LGS8GXX_PROD_LGS8913) {
+		/* FEC auto detect */
+		lgs8gxx_write_reg(priv, 0xC1, 0x03);
+
+		lgs8gxx_read_reg(priv, 0x7C, &t);
+		t = (t & 0x8C) | 0x03;
+		lgs8gxx_write_reg(priv, 0x7C, t);
+
+		/* BER test mode */
+		lgs8gxx_read_reg(priv, 0xC3, &t);
+		t = (t & 0xEF) |  0x10;
+		lgs8gxx_write_reg(priv, 0xC3, t);
+	}
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G52)
+		lgs8gxx_write_reg(priv, 0xD9, 0x40);
+
+	return 0;
+}
+
+static int lgs8gxx_set_mode_manual(struct lgs8gxx_state *priv)
+{
+	u8 t;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		u8 t2;
+		lgs8gxx_read_reg(priv, 0x0C, &t);
+		t &= (~0x80);
+		lgs8gxx_write_reg(priv, 0x0C, t);
+
+		lgs8gxx_read_reg(priv, 0x0C, &t);
+		lgs8gxx_read_reg(priv, 0x19, &t2);
+
+		if (((t&0x03) == 0x01) && (t2&0x01)) {
+			lgs8gxx_write_reg(priv, 0x6E, 0x05);
+			lgs8gxx_write_reg(priv, 0x39, 0x02);
+			lgs8gxx_write_reg(priv, 0x39, 0x03);
+			lgs8gxx_write_reg(priv, 0x3D, 0x05);
+			lgs8gxx_write_reg(priv, 0x3E, 0x28);
+			lgs8gxx_write_reg(priv, 0x53, 0x80);
+		} else {
+			lgs8gxx_write_reg(priv, 0x6E, 0x3F);
+			lgs8gxx_write_reg(priv, 0x39, 0x00);
+			lgs8gxx_write_reg(priv, 0x3D, 0x04);
+		}
+
+		lgs8gxx_soft_reset(priv);
+		return 0;
+	}
+
+	/* turn off auto-detect; manual settings */
+	lgs8gxx_write_reg(priv, 0x7E, 0);
+	if (priv->config->prod == LGS8GXX_PROD_LGS8913)
+		lgs8gxx_write_reg(priv, 0xC1, 0);
+
+	lgs8gxx_read_reg(priv, 0xC5, &t);
+	t = (t & 0xE0) | 0x06;
+	lgs8gxx_write_reg(priv, 0xC5, t);
+
+	lgs8gxx_soft_reset(priv);
+
+	return 0;
+}
+
+static int lgs8gxx_is_locked(struct lgs8gxx_state *priv, u8 *locked)
+{
+	int ret = 0;
+	u8 t;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
+		ret = lgs8gxx_read_reg(priv, 0x13, &t);
+	else
+		ret = lgs8gxx_read_reg(priv, 0x4B, &t);
+	if (ret != 0)
+		return ret;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
+		*locked = ((t & 0x80) == 0x80) ? 1 : 0;
+	else
+		*locked = ((t & 0xC0) == 0xC0) ? 1 : 0;
+	return 0;
+}
+
+/* Wait for Code Acquisition Lock */
+static int lgs8gxx_wait_ca_lock(struct lgs8gxx_state *priv, u8 *locked)
+{
+	int ret = 0;
+	u8 reg, mask, val;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		reg = 0x13;
+		mask = 0x80;
+		val = 0x80;
+	} else {
+		reg = 0x4B;
+		mask = 0xC0;
+		val = 0xC0;
+	}
+
+	ret = wait_reg_mask(priv, reg, mask, val, 50, 40);
+	*locked = (ret == 0) ? 1 : 0;
+
+	return 0;
+}
+
+static int lgs8gxx_is_autodetect_finished(struct lgs8gxx_state *priv,
+					  u8 *finished)
+{
+	int ret = 0;
+	u8 reg, mask, val;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		reg = 0x1f;
+		mask = 0xC0;
+		val = 0x80;
+	} else {
+		reg = 0xA4;
+		mask = 0x03;
+		val = 0x01;
+	}
+
+	ret = wait_reg_mask(priv, reg, mask, val, 10, 20);
+	*finished = (ret == 0) ? 1 : 0;
+
+	return 0;
+}
+
+static int lgs8gxx_autolock_gi(struct lgs8gxx_state *priv, u8 gi, u8 cpn,
+	u8 *locked)
+{
+	int err = 0;
+	u8 ad_fini = 0;
+	u8 t1, t2;
+
+	if (gi == GI_945)
+		dprintk("try GI 945\n");
+	else if (gi == GI_595)
+		dprintk("try GI 595\n");
+	else if (gi == GI_420)
+		dprintk("try GI 420\n");
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		lgs8gxx_read_reg(priv, 0x0C, &t1);
+		lgs8gxx_read_reg(priv, 0x18, &t2);
+		t1 &= ~(GI_MASK);
+		t1 |= gi;
+		t2 &= 0xFE;
+		t2 |= cpn ? 0x01 : 0x00;
+		lgs8gxx_write_reg(priv, 0x0C, t1);
+		lgs8gxx_write_reg(priv, 0x18, t2);
+	} else {
+		lgs8gxx_write_reg(priv, 0x04, gi);
+	}
+	lgs8gxx_soft_reset(priv);
+	err = lgs8gxx_wait_ca_lock(priv, locked);
+	if (err || !(*locked))
+		return err;
+	err = lgs8gxx_is_autodetect_finished(priv, &ad_fini);
+	if (err != 0)
+		return err;
+	if (ad_fini) {
+		dprintk("auto detect finished\n");
+	} else
+		*locked = 0;
+
+	return 0;
+}
+
+static int lgs8gxx_auto_detect(struct lgs8gxx_state *priv,
+			       u8 *detected_param, u8 *gi)
+{
+	int i, j;
+	int err = 0;
+	u8 locked = 0, tmp_gi;
+
+	dprintk("%s\n", __func__);
+
+	lgs8gxx_set_mode_auto(priv);
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		lgs8gxx_write_reg(priv, 0x67, 0xAA);
+		lgs8gxx_write_reg(priv, 0x6E, 0x3F);
+	} else {
+		/* Guard Interval */
+		lgs8gxx_write_reg(priv, 0x03, 00);
+	}
+
+	for (i = 0; i < 2; i++) {
+		for (j = 0; j < 2; j++) {
+			tmp_gi = GI_945;
+			err = lgs8gxx_autolock_gi(priv, GI_945, j, &locked);
+			if (err)
+				goto out;
+			if (locked)
+				goto locked;
+		}
+		for (j = 0; j < 2; j++) {
+			tmp_gi = GI_420;
+			err = lgs8gxx_autolock_gi(priv, GI_420, j, &locked);
+			if (err)
+				goto out;
+			if (locked)
+				goto locked;
+		}
+		tmp_gi = GI_595;
+		err = lgs8gxx_autolock_gi(priv, GI_595, 1, &locked);
+		if (err)
+			goto out;
+		if (locked)
+			goto locked;
+	}
+
+locked:
+	if ((err == 0) && (locked == 1)) {
+		u8 t;
+
+		if (priv->config->prod != LGS8GXX_PROD_LGS8G75) {
+			lgs8gxx_read_reg(priv, 0xA2, &t);
+			*detected_param = t;
+		} else {
+			lgs8gxx_read_reg(priv, 0x1F, &t);
+			*detected_param = t & 0x3F;
+		}
+
+		if (tmp_gi == GI_945)
+			dprintk("GI 945 locked\n");
+		else if (tmp_gi == GI_595)
+			dprintk("GI 595 locked\n");
+		else if (tmp_gi == GI_420)
+			dprintk("GI 420 locked\n");
+		*gi = tmp_gi;
+	}
+	if (!locked)
+		err = -1;
+
+out:
+	return err;
+}
+
+static void lgs8gxx_auto_lock(struct lgs8gxx_state *priv)
+{
+	s8 err;
+	u8 gi = 0x2;
+	u8 detected_param = 0;
+
+	err = lgs8gxx_auto_detect(priv, &detected_param, &gi);
+
+	if (err != 0) {
+		dprintk("lgs8gxx_auto_detect failed\n");
+	} else
+		dprintk("detected param = 0x%02X\n", detected_param);
+
+	/* Apply detected parameters */
+	if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
+		u8 inter_leave_len = detected_param & TIM_MASK ;
+		/* Fix 8913 time interleaver detection bug */
+		inter_leave_len = (inter_leave_len == TIM_MIDDLE) ? 0x60 : 0x40;
+		detected_param &= CF_MASK | SC_MASK  | LGS_FEC_MASK;
+		detected_param |= inter_leave_len;
+	}
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		u8 t;
+		lgs8gxx_read_reg(priv, 0x19, &t);
+		t &= 0x81;
+		t |= detected_param << 1;
+		lgs8gxx_write_reg(priv, 0x19, t);
+	} else {
+		lgs8gxx_write_reg(priv, 0x7D, detected_param);
+		if (priv->config->prod == LGS8GXX_PROD_LGS8913)
+			lgs8gxx_write_reg(priv, 0xC0, detected_param);
+	}
+	/* lgs8gxx_soft_reset(priv); */
+
+	/* Enter manual mode */
+	lgs8gxx_set_mode_manual(priv);
+
+	switch (gi) {
+	case GI_945:
+		priv->curr_gi = 945; break;
+	case GI_595:
+		priv->curr_gi = 595; break;
+	case GI_420:
+		priv->curr_gi = 420; break;
+	default:
+		priv->curr_gi = 945; break;
+	}
+}
+
+static int lgs8gxx_set_mpeg_mode(struct lgs8gxx_state *priv,
+	u8 serial, u8 clk_pol, u8 clk_gated)
+{
+	int ret = 0;
+	u8 t, reg_addr;
+
+	reg_addr = (priv->config->prod == LGS8GXX_PROD_LGS8G75) ? 0x30 : 0xC2;
+	ret = lgs8gxx_read_reg(priv, reg_addr, &t);
+	if (ret != 0)
+		return ret;
+
+	t &= 0xF8;
+	t |= serial ? TS_SERIAL : TS_PARALLEL;
+	t |= clk_pol ? TS_CLK_INVERTED : TS_CLK_NORMAL;
+	t |= clk_gated ? TS_CLK_GATED : TS_CLK_FREERUN;
+
+	ret = lgs8gxx_write_reg(priv, reg_addr, t);
+	if (ret != 0)
+		return ret;
+
+	return 0;
+}
+
+/* A/D input peak-to-peak voltage range */
+static int lgs8g75_set_adc_vpp(struct lgs8gxx_state *priv,
+	u8 sel)
+{
+	u8 r26 = 0x73, r27 = 0x90;
+
+	if (priv->config->prod != LGS8GXX_PROD_LGS8G75)
+		return 0;
+
+	r26 |= (sel & 0x01) << 7;
+	r27 |= (sel & 0x02) >> 1;
+	lgs8gxx_write_reg(priv, 0x26, r26);
+	lgs8gxx_write_reg(priv, 0x27, r27);
+
+	return 0;
+}
+
+/* LGS8913 demod frontend functions */
+
+static int lgs8913_init(struct lgs8gxx_state *priv)
+{
+	u8 t;
+
+	/* LGS8913 specific */
+	lgs8gxx_write_reg(priv, 0xc1, 0x3);
+
+	lgs8gxx_read_reg(priv, 0x7c, &t);
+	lgs8gxx_write_reg(priv, 0x7c, (t&0x8c) | 0x3);
+
+	/* LGS8913 specific */
+	lgs8gxx_read_reg(priv, 0xc3, &t);
+	lgs8gxx_write_reg(priv, 0xc3, t&0x10);
+
+
+	return 0;
+}
+
+static int lgs8g75_init_data(struct lgs8gxx_state *priv)
+{
+	const struct firmware *fw;
+	int rc;
+	int i;
+
+	rc = request_firmware(&fw, LGS8GXX_FIRMWARE, &priv->i2c->dev);
+	if (rc)
+		return rc;
+
+	lgs8gxx_write_reg(priv, 0xC6, 0x40);
+
+	lgs8gxx_write_reg(priv, 0x3D, 0x04);
+	lgs8gxx_write_reg(priv, 0x39, 0x00);
+
+	lgs8gxx_write_reg(priv, 0x3A, 0x00);
+	lgs8gxx_write_reg(priv, 0x38, 0x00);
+	lgs8gxx_write_reg(priv, 0x3B, 0x00);
+	lgs8gxx_write_reg(priv, 0x38, 0x00);
+
+	for (i = 0; i < fw->size; i++) {
+		lgs8gxx_write_reg(priv, 0x38, 0x00);
+		lgs8gxx_write_reg(priv, 0x3A, (u8)(i&0xff));
+		lgs8gxx_write_reg(priv, 0x3B, (u8)(i>>8));
+		lgs8gxx_write_reg(priv, 0x3C, fw->data[i]);
+	}
+
+	lgs8gxx_write_reg(priv, 0x38, 0x00);
+
+	release_firmware(fw);
+	return 0;
+}
+
+static int lgs8gxx_init(struct dvb_frontend *fe)
+{
+	struct lgs8gxx_state *priv =
+		(struct lgs8gxx_state *)fe->demodulator_priv;
+	const struct lgs8gxx_config *config = priv->config;
+	u8 data = 0;
+	s8 err;
+	dprintk("%s\n", __func__);
+
+	lgs8gxx_read_reg(priv, 0, &data);
+	dprintk("reg 0 = 0x%02X\n", data);
+
+	if (config->prod == LGS8GXX_PROD_LGS8G75)
+		lgs8g75_set_adc_vpp(priv, config->adc_vpp);
+
+	/* Setup MPEG output format */
+	err = lgs8gxx_set_mpeg_mode(priv, config->serial_ts,
+				    config->ts_clk_pol,
+				    config->ts_clk_gated);
+	if (err != 0)
+		return -EIO;
+
+	if (config->prod == LGS8GXX_PROD_LGS8913)
+		lgs8913_init(priv);
+	lgs8gxx_set_if_freq(priv, priv->config->if_freq);
+	lgs8gxx_set_ad_mode(priv);
+
+	return 0;
+}
+
+static void lgs8gxx_release(struct dvb_frontend *fe)
+{
+	struct lgs8gxx_state *state = fe->demodulator_priv;
+	dprintk("%s\n", __func__);
+
+	kfree(state);
+}
+
+
+static int lgs8gxx_write(struct dvb_frontend *fe, const u8 buf[], int len)
+{
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+
+	if (len != 2)
+		return -EINVAL;
+
+	return lgs8gxx_write_reg(priv, buf[0], buf[1]);
+}
+
+static int lgs8gxx_set_fe(struct dvb_frontend *fe)
+{
+	struct dtv_frontend_properties *fe_params = &fe->dtv_property_cache;
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+
+	dprintk("%s\n", __func__);
+
+	/* set frequency */
+	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);
+	}
+
+	/* start auto lock */
+	lgs8gxx_auto_lock(priv);
+
+	msleep(10);
+
+	/* TODO: get real readings from device */
+
+	/* bandwidth */
+	fe_params->bandwidth_hz = 8000000;
+
+	fe_params->code_rate_HP = FEC_AUTO;
+	fe_params->code_rate_LP = FEC_AUTO;
+
+	fe_params->modulation = QAM_AUTO;
+
+	/* transmission mode */
+	fe_params->transmission_mode = TRANSMISSION_MODE_AUTO;
+
+	/* guard interval */
+	fe_params->guard_interval = GUARD_INTERVAL_AUTO;
+
+	/* hierarchy */
+	fe_params->hierarchy = HIERARCHY_NONE;
+
+	return 0;
+}
+
+static
+int lgs8gxx_get_tune_settings(struct dvb_frontend *fe,
+			      struct dvb_frontend_tune_settings *fesettings)
+{
+	/* FIXME: copy from tda1004x.c */
+	fesettings->min_delay_ms = 800;
+	fesettings->step_size = 0;
+	fesettings->max_drift = 0;
+	return 0;
+}
+
+static int lgs8gxx_read_status(struct dvb_frontend *fe,
+			       enum fe_status *fe_status)
+{
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+	s8 ret;
+	u8 t, locked = 0;
+
+	dprintk("%s\n", __func__);
+	*fe_status = 0;
+
+	lgs8gxx_get_afc_phase(priv);
+	lgs8gxx_is_locked(priv, &locked);
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		if (locked)
+			*fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
+				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
+		return 0;
+	}
+
+	ret = lgs8gxx_read_reg(priv, 0x4B, &t);
+	if (ret != 0)
+		return -EIO;
+
+	dprintk("Reg 0x4B: 0x%02X\n", t);
+
+	*fe_status = 0;
+	if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
+		if ((t & 0x40) == 0x40)
+			*fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER;
+		if ((t & 0x80) == 0x80)
+			*fe_status |= FE_HAS_VITERBI | FE_HAS_SYNC |
+				FE_HAS_LOCK;
+	} else {
+		if ((t & 0x80) == 0x80)
+			*fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
+				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
+	}
+
+	/* success */
+	dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);
+	return 0;
+}
+
+static int lgs8gxx_read_signal_agc(struct lgs8gxx_state *priv, u16 *signal)
+{
+	u16 v;
+	u8 agc_lvl[2], cat;
+
+	dprintk("%s()\n", __func__);
+	lgs8gxx_read_reg(priv, 0x3F, &agc_lvl[0]);
+	lgs8gxx_read_reg(priv, 0x3E, &agc_lvl[1]);
+
+	v = agc_lvl[0];
+	v <<= 8;
+	v |= agc_lvl[1];
+
+	dprintk("agc_lvl: 0x%04X\n", v);
+
+	if (v < 0x100)
+		cat = 0;
+	else if (v < 0x190)
+		cat = 5;
+	else if (v < 0x2A8)
+		cat = 4;
+	else if (v < 0x381)
+		cat = 3;
+	else if (v < 0x400)
+		cat = 2;
+	else if (v == 0x400)
+		cat = 1;
+	else
+		cat = 0;
+
+	*signal = cat * 65535 / 5;
+
+	return 0;
+}
+
+static int lgs8913_read_signal_strength(struct lgs8gxx_state *priv, u16 *signal)
+{
+	u8 t; s8 ret;
+	s16 max_strength = 0;
+	u8 str;
+	u16 i, gi = priv->curr_gi;
+
+	dprintk("%s\n", __func__);
+
+	ret = lgs8gxx_read_reg(priv, 0x4B, &t);
+	if (ret != 0)
+		return -EIO;
+
+	if (fake_signal_str) {
+		if ((t & 0xC0) == 0xC0) {
+			dprintk("Fake signal strength\n");
+			*signal = 0x7FFF;
+		} else
+			*signal = 0;
+		return 0;
+	}
+
+	dprintk("gi = %d\n", gi);
+	for (i = 0; i < gi; i++) {
+
+		if ((i & 0xFF) == 0)
+			lgs8gxx_write_reg(priv, 0x84, 0x03 & (i >> 8));
+		lgs8gxx_write_reg(priv, 0x83, i & 0xFF);
+
+		lgs8gxx_read_reg(priv, 0x94, &str);
+		if (max_strength < str)
+			max_strength = str;
+	}
+
+	*signal = max_strength;
+	dprintk("%s: signal=0x%02X\n", __func__, *signal);
+
+	lgs8gxx_read_reg(priv, 0x95, &t);
+	dprintk("%s: AVG Noise=0x%02X\n", __func__, t);
+
+	return 0;
+}
+
+static int lgs8g75_read_signal_strength(struct lgs8gxx_state *priv, u16 *signal)
+{
+	u8 t;
+	s16 v = 0;
+
+	dprintk("%s\n", __func__);
+
+	lgs8gxx_read_reg(priv, 0xB1, &t);
+	v |= t;
+	v <<= 8;
+	lgs8gxx_read_reg(priv, 0xB0, &t);
+	v |= t;
+
+	*signal = v;
+	dprintk("%s: signal=0x%02X\n", __func__, *signal);
+
+	return 0;
+}
+
+static int lgs8gxx_read_signal_strength(struct dvb_frontend *fe, u16 *signal)
+{
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8913)
+		return lgs8913_read_signal_strength(priv, signal);
+	else if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
+		return lgs8g75_read_signal_strength(priv, signal);
+	else
+		return lgs8gxx_read_signal_agc(priv, signal);
+}
+
+static int lgs8gxx_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+	u8 t;
+	*snr = 0;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
+		lgs8gxx_read_reg(priv, 0x34, &t);
+	else
+		lgs8gxx_read_reg(priv, 0x95, &t);
+	dprintk("AVG Noise=0x%02X\n", t);
+	*snr = 256 - t;
+	*snr <<= 8;
+	dprintk("snr=0x%x\n", *snr);
+
+	return 0;
+}
+
+static int lgs8gxx_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+	*ucblocks = 0;
+	dprintk("%s: ucblocks=0x%x\n", __func__, *ucblocks);
+	return 0;
+}
+
+static void packet_counter_start(struct lgs8gxx_state *priv)
+{
+	u8 orig, t;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		lgs8gxx_read_reg(priv, 0x30, &orig);
+		orig &= 0xE7;
+		t = orig | 0x10;
+		lgs8gxx_write_reg(priv, 0x30, t);
+		t = orig | 0x18;
+		lgs8gxx_write_reg(priv, 0x30, t);
+		t = orig | 0x10;
+		lgs8gxx_write_reg(priv, 0x30, t);
+	} else {
+		lgs8gxx_write_reg(priv, 0xC6, 0x01);
+		lgs8gxx_write_reg(priv, 0xC6, 0x41);
+		lgs8gxx_write_reg(priv, 0xC6, 0x01);
+	}
+}
+
+static void packet_counter_stop(struct lgs8gxx_state *priv)
+{
+	u8 t;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		lgs8gxx_read_reg(priv, 0x30, &t);
+		t &= 0xE7;
+		lgs8gxx_write_reg(priv, 0x30, t);
+	} else {
+		lgs8gxx_write_reg(priv, 0xC6, 0x81);
+	}
+}
+
+static int lgs8gxx_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+	u8 reg_err, reg_total, t;
+	u32 total_cnt = 0, err_cnt = 0;
+	int i;
+
+	dprintk("%s\n", __func__);
+
+	packet_counter_start(priv);
+	msleep(200);
+	packet_counter_stop(priv);
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
+		reg_total = 0x28; reg_err = 0x2C;
+	} else {
+		reg_total = 0xD0; reg_err = 0xD4;
+	}
+
+	for (i = 0; i < 4; i++) {
+		total_cnt <<= 8;
+		lgs8gxx_read_reg(priv, reg_total+3-i, &t);
+		total_cnt |= t;
+	}
+	for (i = 0; i < 4; i++) {
+		err_cnt <<= 8;
+		lgs8gxx_read_reg(priv, reg_err+3-i, &t);
+		err_cnt |= t;
+	}
+	dprintk("error=%d total=%d\n", err_cnt, total_cnt);
+
+	if (total_cnt == 0)
+		*ber = 0;
+	else
+		*ber = err_cnt * 100 / total_cnt;
+
+	dprintk("%s: ber=0x%x\n", __func__, *ber);
+	return 0;
+}
+
+static int lgs8gxx_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
+{
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+
+	if (priv->config->tuner_address == 0)
+		return 0;
+	if (enable) {
+		u8 v = 0x80 | priv->config->tuner_address;
+		return lgs8gxx_write_reg(priv, 0x01, v);
+	}
+	return lgs8gxx_write_reg(priv, 0x01, 0);
+}
+
+static const struct dvb_frontend_ops lgs8gxx_ops = {
+	.delsys = { SYS_DTMB },
+	.info = {
+		.name = "Legend Silicon LGS8913/LGS8GXX DMB-TH",
+		.frequency_min_hz = 474 * MHz,
+		.frequency_max_hz = 858 * MHz,
+		.frequency_stepsize_hz = 10 * kHz,
+		.caps =
+			FE_CAN_FEC_AUTO |
+			FE_CAN_QAM_AUTO |
+			FE_CAN_TRANSMISSION_MODE_AUTO |
+			FE_CAN_GUARD_INTERVAL_AUTO
+	},
+
+	.release = lgs8gxx_release,
+
+	.init = lgs8gxx_init,
+	.write = lgs8gxx_write,
+	.i2c_gate_ctrl = lgs8gxx_i2c_gate_ctrl,
+
+	.set_frontend = lgs8gxx_set_fe,
+	.get_tune_settings = lgs8gxx_get_tune_settings,
+
+	.read_status = lgs8gxx_read_status,
+	.read_ber = lgs8gxx_read_ber,
+	.read_signal_strength = lgs8gxx_read_signal_strength,
+	.read_snr = lgs8gxx_read_snr,
+	.read_ucblocks = lgs8gxx_read_ucblocks,
+};
+
+struct dvb_frontend *lgs8gxx_attach(const struct lgs8gxx_config *config,
+	struct i2c_adapter *i2c)
+{
+	struct lgs8gxx_state *priv = NULL;
+	u8 data = 0;
+
+	dprintk("%s()\n", __func__);
+
+	if (config == NULL || i2c == NULL)
+		return NULL;
+
+	priv = kzalloc(sizeof(struct lgs8gxx_state), GFP_KERNEL);
+	if (priv == NULL)
+		goto error_out;
+
+	priv->config = config;
+	priv->i2c = i2c;
+
+	/* check if the demod is there */
+	if (lgs8gxx_read_reg(priv, 0, &data) != 0) {
+		dprintk("%s lgs8gxx not found at i2c addr 0x%02X\n",
+			__func__, priv->config->demod_address);
+		goto error_out;
+	}
+
+	lgs8gxx_read_reg(priv, 1, &data);
+
+	memcpy(&priv->frontend.ops, &lgs8gxx_ops,
+	       sizeof(struct dvb_frontend_ops));
+	priv->frontend.demodulator_priv = priv;
+
+	if (config->prod == LGS8GXX_PROD_LGS8G75)
+		lgs8g75_init_data(priv);
+
+	return &priv->frontend;
+
+error_out:
+	dprintk("%s() error_out\n", __func__);
+	kfree(priv);
+	return NULL;
+
+}
+EXPORT_SYMBOL_GPL(lgs8gxx_attach);
+
+MODULE_DESCRIPTION("Legend Silicon LGS8913/LGS8GXX DMB-TH demodulator driver");
+MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE(LGS8GXX_FIRMWARE);